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Views: 19 Author: Site Editor Publish Time: 2024-11-29 Origin: Site
CNC fixtures play a crucial role Whether beginners or experienced professionals, they are well aware of the importance of stable clamping of workpieces during processing. CNC fixtures are like reliable partners, which can ensure that the workpiece maintains accurate position in various machining operations, effectively prevent displacement and deviation, thereby ensuring the smooth progress of processing and achieving high-quality machining results. Next, we will explore the relevant knowledge of CNC fixtures in depth.in ，the field of machining .
CNC fixtures are special tools that are responsible for firmly clamping the workpiece during various processing processes, ensuring that the workpiece is accurately positioned and stable throughout the operation, and preventing any unnecessary movement. It is indispensable for improving processing accuracy, repeatability and efficiency. By firmly fixing the workpiece, stable working conditions are created for the cutting tool, allowing it to perform accurate and consistent cutting operations, which is of great significance to the production of high-quality parts. Essentially, CNC fixtures simplify machining preparation and optimize the entire machining process by reducing errors and increasing productivity.
In CNC machining , precise positioning is a key element. The fixture ensures accurate alignment and positioning of the workpiece, thus achieving consistent cutting results. If the positioning is biased, even a slight movement may lead to inaccurate processing results and waste of materials and time. CNC fixtures effectively eliminate this risk by firmly securing the workpiece.
Proper clamping is essential to prevent the workpiece from moving or vibrating during processing. Depending on the workpiece size and processing operation, different types of clamping methods will be selected. Effective clamping ensures that the workpiece does not slide when subjected to high cutting forces, which is particularly critical for achieving precise machining results, especially during complex machining processes such as CNC grinding or milling.
The core of CNC fixtures is workpiece clamping, and its purpose is to fix the workpiece so that the machine tool can operate effectively. Workpiece clamping devices such as fixtures, vises and fixtures are indispensable for maintaining the stability of the workpiece. This stability helps better control the cutting tool and minimizes the risk of error in machining operations.
One of the significant advantages of By stably securing the workpiece and ensuring proper alignment, the clamp allows the cutting tool to operate accurately without deviation. This accuracy is particularly important when machining complex parts that require strict tolerances. Suitable fixture designs can significantly improve cutting, drilling and milling accuracy, resulting in high-quality finished products. using CNC fixtures is the improvement of accuracy.
Efficient fixture settings reduce idle time and maximize spindle time. In CNC machining, spindle time refers to the time period when the cutting tool actively cuts the material. By reducing setup changes and enabling quick part replacement, CNC clamps help improve productivity and reduce overall machining time.
The fixture provides repeatable accuracy, which means that the same parts can be manufactured multiple times and have precise dimensions. This repeatability is a fundamental aspect of CNC machining, ensuring that every part produced is the same as the others. Accurate positioning also reduces the need for frequent measurements and adjustments, saving time and resources.
CNC fixtures simplify machining processes, reduce set-up time and improve workflow. Effective workpiece clamping and clamping allows mechanics to focus on other tasks, knowing that the fixture will keep the workpiece in position throughout the operation. This efficiency translates into faster production cycles and better resource utilization.
The main function of CNC fixtures is to securely secure the workpiece to prevent any undesirable movement during processing. The fixture uses various clamping mechanisms such as vises, fixtures or vacuum fixtures to grab the workpiece, ensuring that the workpiece remains stable when the cutting tool applies force. For example, in a milling operation, the fixture can prevent the workpiece from being displaced, thereby achieving precise cutting.
Different clamping mechanisms are used depending on the type of workpiece and the processing process. Some clamps use manual clamping, while others rely on pneumatic or hydraulic systems for faster and consistent clamping. Effective clamping prevents vibration and maintains workpiece stability, which is essential for maintaining accuracy during high-speed machining.
Precise positioning is achieved through precision alignment features built into the fixture design. Fixtures usually include positioners, stops and guide pins to help with the correct placement of the workpiece. These components ensure that the workpiece is arranged in the correct orientation, allowing the cutting tool to accurately follow the specified tool path. Correct alignment is especially critical when it comes to multiple operations, such as drilling, milling and boring.
CNC fixtures can be designed to accommodate different machining operations, including turning, grinding and drilling. For example, modular fixtures are adaptable and can be reconfigured to suit a variety of workpieces and machining processes. This flexibility enables manufacturers to perform multiple tasks using a single fixture setup, reducing the need for frequent adjustments and improving workflow efficiency.
By ensuring that the workpiece is securely secured, aligned and properly positioned, the CNC fixture minimizes the need for manual adjustment during machining. This efficiency translates into faster production times because the machine can run continuously without interruption. Fixtures designed for automation systems can further improve efficiency by enabling rapid replacement between parts to maximize spindle time.
CNC fixtures are designed to integrate seamlessly with CNC machines and support a variety of machining settings. They help keep the workpiece position relative to the machine spindle, allowing the cutting tool to perform operations as programmed. This integration ensures that the workpiece follows the specified toolpath, enabling precise cutting and reducing the risk of errors.
The materials used in CNC fixtures play an important role in their performance. Typically, the fixture is made of a durable material such as steel or aluminum that can withstand the forces exerted by CNC machines. Some fixtures are designed with soft claws or gaskets to protect precision workpieces from damage. Choosing the right fixture material is essential to ensure long-term performance and reliability.
1. Milling fixture : used to fix the workpiece during CNC milling to ensure its stable position, so that the cutting tool can accurately cut on multiple surfaces. It is often used to mill complex shapes or patterns, which can reduce vibration and ensure that the final product size meets tolerances. Require.
2. Turning fixture : used to fix workpieces on CNC lathes so that they are processed into the desired shape by the cutting tool during rotation. It is especially suitable for the production of cylindrical parts (such as shafts and rods), which can achieve smooth and consistent material removal. , improve the surface finish quality, and facilitate rapid loading and unloading, and improve production efficiency.
3. Grinding fixture : designed for CNC grinding operations to ensure the stability of the workpiece during the grinding process and withstand high-pressure contact of the grinding wheel. It is often used for high-precision surface finishing tasks such as obtaining smooth surfaces, precise edges and accurate Dimensions to prevent workpieces from moving and ensure processing quality.
4. Drilling fixture : used in CNC drilling operations to ensure that the workpiece remains in the correct position when drilling and prevents movement. It is often used in applications where multiple holes are required to drill in precise positions in industries such as automobiles and aerospace. It is equipped with positioning Pins, fixtures and bushings to maintain alignment, ensuring consistent depth and diameter of the holes, saving time and improving product quality.
5. Boring fixture : used in CNC boring operations, firmly fixing the workpiece, so that the boring tool can accurately expand existing holes along the path to precise dimensions. It is often used in processing processes with strict tolerance requirements, such as mechanical parts (such as shafts and bearings) create precise fits to reduce vibration and tool skew, and improve surface finish and accuracy consistency during production.
6. Welding fixture : Fix the workpiece during welding operations to ensure that all components are properly aligned, so that the welding process is smooth and efficient. It is often used in applications that require precise angle and position of welding components such as automobiles and heavy machinery assembly. It reduces manual adjustment by fixing the direction of the components. Save time and ensure uniform welding, often used with robot welding systems, improve production repeatability and accuracy.
7. Brushing fixture : Used during the broaching process to ensure the stability of the workpiece, so that the broach can cut materials smoothly and consistently, create precise shapes (such as keyways, gears, etc.), and the workpiece remains stable when the broaching tool applies force. Ensure consistent quality of parts, its design is easy to set up and adjust quickly, and is suitable for mass production.
8. Tapping fixture : Fix the workpiece during tapping operation to prevent it from moving, ensure accurate alignment of the cutting tool, ensure consistent thread quality when processing metal, plastic and other materials, reduce setting time, improve efficiency and repeatability, suitable for A mass production environment for industries such as automobiles and aerospace.
1. Manual fixture : Relying on manually operated fixtures, screws or levers to secure workpieces, simple and cost-effective, suitable for small batch production or settings requiring flexibility, easy to integrate into existing CNC machines, quickly adjustable to adapt Although different parts, although the speed is not as fast as hydraulic systems, can still provide good control and adaptability in tasks with high accuracy requirements, and are a common choice for small machining workshops.
2. Hydraulic clamp : Use pressurized fluid to provide consistent clamping force to ensure stable and fixed workpieces. It is suitable for mass production, can reduce the setting time and maintain stable positioning when withstand heavy cutting forces. It is commonly found in automobiles or aerospace. Manufacturing and other applications that require high repetition and speed requirements, the hydraulic mechanism can accurately control clamping force and reduce the risk of workpiece movement during cutting. Although power sources are required and maintenance is high, it can improve the overall productivity and accuracy of CNC machining operations. .
3. Pneumatic fixture : Use compressed air to clamp and fix workpieces during CNC processing. It is suitable for environments where fast and consistent clamping is required, especially automated production lines. It can provide reliable workpiece fixation and ensure stability during high-speed processing. , easy to control, is often used in industries such as automotive and electronics, and is critical to improving production efficiency, as its operation is based on air pressure, enabling quick setup and cycle times.
4. Electric clamp : Use motors or actuators to generate clamping force, which can accurately control clamping force and positioning, and is often integrated into an automated system, which can program and adjust clamping according to the specific requirements of the workpiece. It is required to be accurate in aerospace and precision engineering. , is particularly useful in applications of consistent clamping. The automated clamping process can reduce operator fatigue and ensure repeatability. It is a valuable tool in high-precision machining environments.
5. Magnetic fixture : Use magnetic fields to fix ferromagnetic workpieces without mechanical fixtures, saving time and reducing operator fatigue, providing uniform clamping force, reducing the risk of damage to precision parts, suitable for high-precision processing processes (such as CNC grinding or Light milling), allowing for easy repositioning, helping to reduce setup time, is highly favored in industries such as automotive and aerospace for high efficiency and accuracy requirements.
1.Verb fixture : The workpiece is fixed by tightening the jaws through the screw mechanism. It is a commonly used fixture in CNC processing. It is suitable for repeatable processing tasks such as milling and drilling. It has high stability and accuracy, is easy to adjust, and can handle different Workpieces of size and shape are highly reliable and widely used in the automotive industry and metal processing fields.
2. Modular fixture : It consists of a single component (such as fixture plates, fixtures and positioners), which can be configured and reconfigured according to specific work requirements. It is suitable for industries with frequent changes in production requirements (such as aerospace or customized manufacturing), and can Supports workpieces of different shapes and sizes to improve efficiency without the need for multiple special fixtures.
3. Vacuum fixture : Use suction to fix the workpiece, suitable for flat, precise or irregularly shaped parts, and secure the workpiece to the fixture plate through vacuum force to reduce the risk of damage. It is often used in the process of maintaining surface integrity in CNC processing. (such as cutting thin metal plates, wood or plastic components) is widely used in milling, engraving and finishing operations.
4. Fixture (Guide Clamps) : Guide the cutting tool during machining operations, not only fixing the workpiece, but also ensuring that the tool accurately cuts holes, grooves or shapes at the required location. It is often used in operations such as CNC drilling and tapping with high accuracy requirements. Improve production accuracy by eliminating the need for manual alignment, reducing set-up time, and widely used in manufacturing operations such as automobiles that require high consistency.
5. Indexing fixture : used to accurately rotate the workpiece to set angle when performing multiple machining tasks on a single workpiece, ensuring machining uniformity at different positions (such as drilling, milling or tapping), and cutting tools ( Used with end mills and drills, such as end mills and drills, simplifies the tasks of angle adjustments required by CNC machines (equipped with rotary tables or indexing heads).
6. Tombstone fixture (tower fixture) : The vertical structure allows multiple workpieces to be installed simultaneously, and improves CNC milling efficiency by machining different parts in one setup. It is suitable for mass production, reduces the need for setup and tool replacement, and is often used in automobiles and aviation. In environments such as aerospace manufacturing, modular design provides flexibility for environments that require high accuracy and speed, allowing for flexibility to switch between different machining tasks while maintaining consistent clamping force and stability of each workpiece.
7. Fixture (claw fixture) : It is one of the most common fixtures in CNC processing. Various clamping types (such as lever fixtures, toggle fixtures and screw mechanisms) are used to fix the workpiece during the processing to ensure that the workpiece is milled, When subjected to cutting forces during drilling and turning operations, the choice of fixture depends on the workpiece material, shape and the type of CNC machine tool used. Reliable clamping force ensures accurate cutting and drilling, and maintains machining accuracy.
8. Trunnion fixture : specially used for multi-axis CNC machining, consists of a rotating workbench mounted on the pivot shaft, which can position the workpiece at different angles, suitable for complex machining tasks (such as automobiles or aerospace components), which requires Accurate alignment, used with cutting tools such as end mills and drills, reduces cycle time as its design allows machining multiple facets of parts in a single setup, simplifying the production process and improving overall efficiency.
9.Chengkeng fixture : used to firmly fix cylindrical workpieces in CNC processing, provide tight clamping through radial pressure of the chuck (cylindrical sleeve). It is often used for turning and milling high-precision parts (such as bolts, rods, etc.) , designed for quick loading and unloading, suitable for mass production and operation of CNC machine tools, ensuring stability, reducing errors and improving overall processing accuracy.
10. Angle plate fixture : designed for tasks that require fixing workpieces at specific angles, consisting of precisely ground 90-degree angle plates, providing a solid foundation for fixing parts, often used in milling and drilling operations, especially for machining multiple surfaces Or when cutting angles, it supports efficient machining from different axes without repositioning the workpiece. Its solid design reduces vibration and ensures consistent accuracy and surface finish during processing.
11. Special CNC fixture
Dual - station fixture : allows processing on multiple sides of the workpiece at the same time. It is suitable for situations where efficiency and reduction of setting time are high. Two identical parts can be processed at the same time to improve production efficiency. It is often used in large-scale production environments. CNC milling machines are compatible with turning centers, ensuring the stability of parts during operation through fixtures, screws, etc., design reduces operator intervention, shortens downtime, and improves productivity.
· Trunnion workbench (rotating workbench) : Rotate around the axis to achieve multi-faceted machining without manual repositioning of the workpiece. It is often used in CNC machine tools that require precise processing of parts from different angles (such as 5-axis machining operations), in automobiles and aerospace Common in the industry, it is used for complex parts processing, with a grading function, which can program the precise rotation point to ensure repeatability, and is used in conjunction with cutting tools such as end milling cutters and drill bits to facilitate complex machining tasks while maintaining stability.
Pallet fixture : designed for quick and efficient replacement of workpieces, operators can load another pallet while one pallet is processed, minimizing machine downtime, suitable for production environments that are critical to high yields, by reducing each time Machine reset requirements during new parts processing simplify the production process, often used in combination with modular clamping systems, can be easily customized according to workpiece size and shape, and is commonly found in CNC milling machines, which can accommodate multiple workpieces at the same time.
· Rotary fixture : Provides rotational motion for machining on circular or cylindrical parts, essential in CNC turning and grinding, and is used in conjunction with lathes and milling machines to ensure accurate rotation of the workpiece for precise shape, usually equipped The chuck or chuck secures the workpiece and can also be used for indexing, allowing the machine to cut at precise intervals on the circumference of the part.
· Lathe fixture : specially used for turning operations, firmly fixing the cylindrical workpiece so that it contacts the cutting tool when rotated to form the desired shape. It is an indispensable part of CNC lathes and is used to produce symmetrical parts (such as shafts and rods) and bushings), including chucks, panels and chuck systems to suit different workpiece sizes, help maintain accuracy, reduce vibration, improve surface finish and machining accuracy.
Gantry fixture : used in large CNC machine tools, commonly used in aerospace and shipbuilding industries, can fix large and heavy workpieces, provide stability during long-term processing, and cooperate well with gantry CNC machine tools, where the cutting tool fixes the workpieces Move above, customized to the project requirements, and handles complex shapes and various materials, ensuring that the workpiece remains fixed when subjected to huge cutting forces.
· Flexible fixtures : Use flexible components to adapt to different workpiece shapes, suitable for thin or precision parts that may deform under traditional clamping pressure, allowing precision machining without damaging the structural integrity of the workpiece. It is often used in the micro-machining industry and is performed with precision Operated CNC machine tools are compatible to minimize the risk of warping or misalignment and provide firm clamping while maintaining the original shape of the workpiece.
· Zero-point fixture : realizes rapid setup and replacement, popular in environments where frequent re-equipment is required. The workpiece is locked in precise positions through the clamping mechanism, reducing setup errors, and improving repeatability. It is widely used in various CNC machine tools (from milling to Drilling), is crucial for mass production, significantly reduces downtime, enables task switching quickly without sacrificing accuracy, ensures that every set is back to the exact position, and improves consistency and accuracy of production operations.
12. Advanced CNC fixtures
· Adaptive fixtures : Automatically adjust to adapt to the shape and size of the workpiece. Unlike traditional fixtures, it can handle non-uniform size parts, use sensors and actuators to sense workpiece characteristics, ensuring firm clamping without manual adjustment, suitable for flexibility Ability to manufacture environments such as custom machining and small batch production, can be integrated with CNC machines, improve efficiency by reducing setup time, and is compatible with a variety of cutting tools such as end mills, drills and taps for complex machining setups.
· Smart fixtures : Integrate sensors and intelligent systems to monitor and adjust the workpiece clamping process, detect problems such as misalignment, tool wear, etc., and provide real-time feedback to the CNC operator or directly to the machine tool control system to improve machining accuracy, reduce errors, and improve Product quality, commonly found on automated production lines, works seamlessly with robotic systems, is crucial in advanced CNC machining operations with high accuracy and consistency requirements, designed to integrate with complex software systems for processing with strict tolerances .
· Robot assisted fixture : Working in conjunction with the robot arm to achieve automatic positioning and clamping of workpieces, it is crucial in mass production, which can improve speed and repeatability. The robot assists in loading, unloading and operating parts, allowing the CNC machine to continuously Run without manual intervention, reduces operator fatigue and improves productivity. It is commonly used in the assembly process, automobile manufacturing, and electronic equipment production industries. It can process workpieces of different shapes and sizes according to robot programming and CNC machine tool instructions to ensure efficient and accurate processing operate.
Accuracy and repeatability are core elements of CNC fixtures. High-precision fixtures ensure that the workpiece is in the same position during each machining process, thus ensuring consistency and accuracy of machining dimensions. For example, using precision positioning pins and positioning slots, the positioning accuracy of the workpiece can be controlled within a very small tolerance range. Repeatability enables that in mass production, each part can meet the same quality standards, reducing waste rate and improving production efficiency.
Suitable clamping force is essential for the fixation of the workpiece. If the clamping force is too small, the workpiece may be displaced during the processing, resulting in machining errors; if the clamping force is too large, it may damage the surface of the workpiece or deform the workpiece. Modern CNC fixtures are usually equipped with pressure sensors or adjustment devices that accurately control the clamping force to meet workpiece needs of different materials and shapes.
Accurate positioning and alignment functions are the basis for high-precision machining of CNC fixtures. By designing a reasonable positioning reference surface, positioning block and guide device, the fixture can ensure the accurate position and orientation of the workpiece in the machine tool coordinate system. For example, in milling processing, the positioning device of the fixture can accurately align the surface to be processed by the workpiece with the cutting path of the milling cutter, thereby ensuring that the processed plane is flat and the dimensions are accurate.
In order to meet the processing needs of different workpieces, CNC fixtures need to have certain adaptability and flexibility. Some modular fixtures can quickly adapt to workpieces of various shapes and sizes by replacing different collets, positioning elements or adjusting the structure of the fixture. In addition, some advanced fixtures can also achieve automatic adjustments, automatically adjusting the clamping position and clamping force according to the characteristics of the workpiece, improving the versatility and production efficiency of the fixtures.
CNC fixtures are usually made of high-strength and wear-resistant materials, such as high-quality alloy steel, aluminum alloy, etc. These materials can withstand cutting forces, vibrations and wear during processing, ensuring the long-term and stable use of the fixture. At the same time, some key parts of the fixtures will also be surface treated, such as quenching, nitriding, etc., further improving their hardness and wear resistance and extending the service life of the fixtures.
The CNC fixture must be perfectly compatible with the CNC machine tool used, including the machine tool table size, T-slot specifications, spindle speed, feed speed and other parameters. Only in this way can we ensure that the fixture can be properly installed, fixed and operated on the machine tool and give full play to its role. When designing and selecting CNC fixtures, it is necessary to fully consider the model and technical parameters of the machine tool to make reasonable matching.
Steel is one of the commonly used materials for CNC fixtures, with high strength, high hardness and good wear resistance. It can withstand large cutting and clamping forces and is suitable for processing workpieces of various metal materials. Different types of steels (such as carbon steel and alloy steel) have different performance characteristics and can be selected according to specific processing needs. For example, alloy steel has better comprehensive performance and is suitable for occasions where clamp strength and toughness are high.
Aluminum has the advantages of light weight, high strength and good thermal conductivity. In some occasions where there is a requirement for fixture weight (such as when high-speed processing or frequent fixture replacements are required), aluminum fixtures are a good choice. It can reduce the load on the machine tool, improve machining speed and efficiency. At the same time, the good thermal conductivity of aluminum helps to dissipate heat and can reduce the risk of deformation of workpieces and fixtures caused by heat accumulation during processing.
Cast iron has good shock absorption and stability, which can effectively reduce vibration and noise during processing. It is suitable for processing some workpieces that require high surface finish, because its shock absorption performance can avoid surface ripples caused by vibration. However, cast iron has relatively low strength and may require increased wall thickness or a reinforced structure when subjected to large cutting forces.
Composite materials (such as carbon fiber reinforced composites) are also used in the field of CNC fixtures. This type of material has the characteristics of high strength, low density, and high rigidity, which can reduce weight while ensuring the strength of the fixture. They also have good corrosion resistance and fatigue resistance, and are suitable for processing tasks that require high fixture performance. However, the cost of composite materials is relatively high and the processing technology is relatively complex.
Before designing CNC fixtures, a detailed analysis of the workpiece is required, including the shape, size, material, processing technology requirements of the workpiece. Understanding these characteristics of the workpiece helps determine parameters such as the type of fixture, clamping method, positioning reference, and the required clamping force. For example, for workpieces with complex shapes, special positioning and clamping mechanisms may be required; for workpieces with brittle materials, soft clamping methods are required to avoid damage to the workpiece.
According to the processing technology of the workpiece, reasonably plan the functions and structure of the fixtures. For example, if the workpiece needs to be processed on multiple sides, the fixture should have rotation or indexing functions to complete the processing of multiple sides in one clamping, reduce the number of clamping times, and improve processing accuracy and efficiency. At the same time, it is also necessary to consider factors such as cutting force direction and tool path during the processing process to ensure that the fixture can stably fix the workpiece during the processing process and will not interfere with the tool.
Determining the accuracy requirements of the fixture is a key link in the design. According to the machining accuracy requirements of the workpiece, reasonably design parameters such as positioning accuracy, clamping accuracy and repeat positioning accuracy of the fixture. During the design process, the impact of factors such as manufacturing error, assembly error and wear during use on the fixture accuracy should be fully considered, and corresponding compensation measures should be taken. For example, adjustable positioning elements or increasing the number of positioning pins can be used to improve positioning accuracy.
Choosing the right clamping mechanism is an important measure to ensure the stable and fixed workpieces. The clamping mechanism should be designed according to the shape, size and material of the workpiece to ensure that the clamping force is evenly distributed and avoid deformation of the workpiece due to excessive local stress. Common clamping mechanisms include spiral clamping mechanisms, eccentric clamping mechanisms, pneumatic clamping mechanisms, hydraulic clamping mechanisms, etc. When designing a clamping mechanism, it is also necessary to consider its operational convenience and reliability, as well as the speed of clamping and loosening, to meet the requirements of production efficiency.
In order to improve the performance and reliability of the fixture, the structure of the fixture needs to be optimized. Adopt a reasonable structural form to reduce the weight and volume of the fixture and improve its rigidity and stability. For example, design methods such as frame structures and reinforcement ribs can be used to enhance the rigidity of the fixture; the fixture structure can be optimized through finite element analysis and other methods, and the weak links in the structure can be found and improved to improve the fixture when withstands cutting forces. deformation ability.
When designing CNC fixtures, the principles of standardization and modularity should be followed as much as possible. The use of standard parts and interfaces can facilitate the manufacturing, assembly and maintenance of fixtures and reduce costs. At the same time, the modular design concept allows the fixture to be quickly combined and adjusted according to different workpieces and processing needs, improving the versatility and flexibility of the fixture. For example, a series of standard chucks, positioning blocks and clamping elements can be designed to adapt to the machining of various workpieces in different combinations.
Before installing the CNC fixture, the machine tool table needs to be cleaned and inspected to ensure that the table surface is flat, free of debris and the T-groove is not damaged. At the same time, prepare the tools and accessories needed for installation, such as bolts, nuts, gaskets, etc. The fixture itself must also be inspected to ensure that each component is intact and has no looseness or deformation.
1. Place the fixture on the machine tool workbench according to the design requirements, so that the fixture's positioning reference is aligned with the T-slot or positioning hole of the machine tool workbench.
2. Use bolts, nuts and other connecting parts to fix the clamp on the workbench. Pay attention to the moderate tightening torque. It is necessary to ensure that the clamp is firmly fixed, and it is not necessary to damage the workbench or clamp due to excessive tightening.
3. Connect the power source of the fixture (such as pneumatic pipelines, hydraulic pipelines or power cords) to ensure that the connection is correct and there is no leakage. For pneumatic and hydraulic clamps, it is also necessary to adjust the pressure of the pressure source to meet the clamping force requirements of the clamping force.
1. No-load debugging: After the installation is completed, no-load debugging is performed first, and the clamping and loosening of the machine tool spindle and fixture are started to observe whether the clamp movement is smooth, whether there is any jam or abnormal noise. Check whether the clamping and loosening positions of the clamping mechanism are accurate and whether the stroke meets the requirements.
2. Workpiece clamping and debugging: Install the workpiece on the fixture and position and clamp according to the processing technology requirements. Check whether the clamping position of the workpiece is correct, whether the clamping force is uniform, and whether it can meet the stability requirements during the processing process. You can use measuring tools such as dial gauge to detect the positioning accuracy of the workpiece. If there is any deviation, adjust the positioning elements of the fixture in time.
3. Cutting force testing and debugging: After the workpiece is clamped and debugged, perform cutting force testing and debugging. Select the appropriate tool and cutting parameters and perform trial cutting. Observe the performance of the fixture when it is subjected to cutting forces and check whether the workpiece has displacement or vibration. If problems are found, such as insufficient rigidity of the fixture or insufficient clamping force, further optimization or adjustment of the fixture needs to be made, such as adding reinforcement ribs, adjusting the clamping force, etc.
Clean the CNC fixture regularly to remove chips, oil and dust from the surface of the fixture. Cleaning can be done using tools such as compressed air, brushes or detergents. Keeping the fixture clean helps improve its positioning accuracy and clamping performance, reducing failures caused by debris accumulation.
Regularly lubricate the moving parts of the fixture (such as the hinges, guides, etc. of the clamping mechanism). Select suitable lubricants, such as lubricant, grease, etc., and add them according to the prescribed lubrication cycle. Lubrication can reduce friction and wear of moving parts, extend the service life of the fixture, and ensure smooth movement.
Regularly check the accuracy of CNC fixtures, including positioning accuracy, clamping accuracy and repeat positioning accuracy. Testing can be done using standard samples or measuring instruments such as three-coordinate measuring instruments. If the accuracy is found to decrease, analyze the cause in time and take corresponding measures to repair it, such as adjusting the positioning components, replacing worn parts, etc.
For severely worn or damaged parts in the fixture, they must be replaced in time. For example, when springs, sealing rings and other consumable parts in the clamping mechanism, as well as positioning pins, positioning blocks, etc. in the positioning elements, they should be replaced with new standard components in time to ensure the normality of the fixture Usage and accuracy requirements.
When the CNC fixture is temporarily not in use, proper storage management is required. After cleaning the fixture, apply anti-rust oil to prevent it from rusting. Store the fixture in a dry and ventilated environment to avoid moisture, heat or other corrosive substances. You can use a dedicated fixture storage rack or storage box to sort and store the fixtures for easy management and access.
CNC fixtures play an extremely important role For example, in the processing of aircraft engine blades, due to the complex shape and high accuracy requirements of the blades, specially designed high-precision CNC fixtures are used. These fixtures can accurately position and clamp the blades, making them stable during milling, grinding and other processing, ensuring that the surface accuracy, contour accuracy and surface finish of the blades can meet strict design requirements. At the same time, in order to adapt to the processing of different types of blades, the fixture also has certain flexibility and adjustability. By replacing part positioning and clamping elements, the processing needs of multiple blades can be met.in the processing of aerospace components .
The production of automotive parts relies heavily on CNC fixtures. Taking the machining of the cylinder block of the automobile engine as an example, the cylinder block requires multi-faceted and porous processing, and the dimensional accuracy and position accuracy are very high. Using CNC fixtures can complete milling, drilling, boring and other machining operations on multiple surfaces in one clamping. For example, using a clamp with a rotation indexing function, each surface of the cylinder can be rotated accurately to the processing position in sequence, reducing the number of clamping times and improving processing efficiency and accuracy. Moreover, by reasonably designing the clamping mechanism of the clamping machine, the clamping force can be applied evenly to avoid deformation of the cylinder during processing, and ensure the quality and performance of the cylinder.
CNC fixtures are also widely used For example, in the processing of printed circuit boards (PCBs), it is necessary to perform precise drilling, milling slots and other operations on the PCB board. The CNC fixture securely secures the PCB board to the table and ensures accurate positioning of the drilling and milling slots through positioning elements. Since PCB boards are usually thin and brittle, the clamping force of the fixture needs to be precisely controlled to avoid damaging the PCB board. Some advanced CNC fixtures can also be combined with automated production lines to achieve rapid clamping and processing of PCB boards, improving the production efficiency and quality of electronic equipment.in the manufacturing of electronic equipment .
With the advancement of Industry 4.0 and intelligent manufacturing, CNC fixtures will develop towards intelligence and automation. Future CNC fixtures will integrate more sensors and intelligent control systems, which can automatically sense information such as the shape, size and position of the workpiece, and automatically adjust the clamping force, positioning position and other parameters of the fixture based on this information. At the same time, the fixture will work closer together with CNC machine tools, robots and other equipment, realize automated workpiece clamping, processing and unloading, improve production efficiency and processing accuracy, and reduce manual intervention.
The requirements for product quality and processing accuracy are constantly increasing, which has prompted CNC fixtures to continuously improve their accuracy and rigidity. The application of new materials and manufacturing processes will help develop higher precision and higher rigidity fixtures. For example, using nanomaterials or high-performance composites to make key components of a fixture can improve its rigidity and accuracy while reducing the weight of the fixture. In addition, advanced design methods (such as topological optimization design) will further optimize the structure of the fixture, improve its deformation ability when withstanding cutting forces, and ensure the stability of machining accuracy.
To meet the increasingly complex processing needs, CNC fixtures will have more functions and achieve integrated development. Future fixtures may integrate multiple clamping methods, positioning functions and auxiliary machining functions to become a multifunctional machining unit. For example, integrating functions such as clamping, rotation indexing, and measurement into one fixture can not only fix the workpiece during the processing process, but also monitor the processing status of the workpiece in real time and automatically adjust it as needed, reducing the processing of the workpiece during the processing process. Assist time, improves production efficiency and processing quality.
Under the general trend of energy conservation and environmental protection, the lightweight design of CNC fixtures will receive more attention. By adopting lightweight materials and optimized structural design, the weight of the fixture is reduced, thereby reducing the energy consumption of the machine and carbon emissions during processing. At the same time, in the manufacturing and use of fixtures, we will pay more attention to environmental protection requirements, reduce the use of materials and processes that are harmful to the environment, improve the utilization rate of resources, and promote sustainable development.
Dongguan Ruibang Model Manufacturing Technology Co., Ltd. has rich experience and outstanding technical strength in the field of The company focuses on CNC processing . CNC precision machining and provides manual board model manufacturing and non-standard parts processing services. In terms of CNC fixtures, the company has a professional design team that can design and customize high-precision and high-reliability CNC fixtures according to different workpiece shapes, sizes and processing technology requirements. The company pays attention to the selection and quality control of fixture materials, and uses high-quality steel, aluminum and other materials to ensure that the fixture has good strength, rigidity and durability. At the same time, the company also has strict processes and standards in the installation, commissioning, maintenance and maintenance of fixtures, which can ensure that the fixtures are always in the best working state during the CNC processing process and provide customers with high-quality processing services. Whether it is the processing of complex parts in the aerospace, automobile manufacturing, electronic equipment and other industries, or the CNC processing needs in other fields, Dongguan Ruibang Model Manufacturing Technology Co., Ltd. can provide customers with its professional CNC fixture technology and a complete service system. Create high-quality solutions to help customers gain an advantage in fierce market competition.
