A brief discussion on the anti-rust treatment method of mechanical parts processing workpieces

At present, many domestic machinery manufacturers do not pay enough attention to the anti-rust treatment of mechanical parts. During the processing, processing, inspection, storage and other processes, the processed workpieces are prone to rust due to humid air, hand sweat and contact with harmful gases in the atmosphere, resulting in scrapping or reworking of processed workpieces, greatly increasing unnecessary enterprises Manufacturing cost. Today, let’s talk about the rust prevention problem during the entire process of mechanical parts processing .

The possibility of rust in mechanical parts mainly occurs in the processing process, assembly process, inventory and the final packaging and factory process of the product. The following will provide detailed explanations on the anti-rust treatment method and how to inspect the anti-rust quality between each process.

Rust prevention between the first process

1. Anti-rust measures during cutting: Use emulsified cutting fluid with cooling, lubrication and anti-rust effects, and its anti-rust period can reach 5-6 days.

2. For processing parts whose turnover time exceeds 5-6 days between each process, during the turnover period, the processing surface should be protected by 102 anti-rust lubricating dual-purpose oil.

Rust prevention in assembly process

1. The processing surface of the sewing site must be pre-coated with 102 anti-rust lubricating dual-purpose oil before assembly to prevent rust.

2. When the parts are rusted before assembly, according to the surface corrosion conditions and roughness, as well as the different accuracy requirements, first use gauze or abrasives of different particle sizes to remove rust, and then perform anti-rust treatment.

3. Before the hydraulic system of the reducer is tested, oil is added to the reducer as needed. During the test run, 30% 102 anti-rust oil can be injected to prevent rust treatment in the internal parts of the reducer and the pipelines. Cold-drawn pipes, hot-rolled pipes, hot-bending or welded prefabricated pipes that have not been treated with anti-rust should be degreased, pickled, neutralized, water-washed and anti-rust treatment before assembly. Only stainless steel pipes should be pickled after welding. Stainless steel pipes are not pickled, stainless steel pipes and steel pipes are not pickled, and are not rust-proof. Only the outer surface of the pipes that have been picked and phosphated by CNC can be coated with anti-rust paint; the pickling treatment should be carried out in a pickling tank with the corresponding buffer, and then rinsed. After the trial operation, all pipes laid on the machine that are no longer removed, and the valve holes and valve holes that are removed must be blown or wiped with compressed air. After drying, seal the holes and valve holes of the pipe.

Rust-proof stock of finished parts

1. The storage room should be kept dry and clean, free of corrosive gases, and avoid direct sunlight.

2. When the finished product is put into the warehouse, after the surface is cleaned, 102 BY protection and lubricating dual-purpose oil should be applied, and reprotected every 10 days; if the inner cavity can be closed, 102 anti-rust oil should be applied to protect it, and the storage time should be provided. Longer precision parts should also be coated with anti-rust packaging.

3. When storing in the open air, the finished parts should be coated with special anti-rust oil protection.

4. Inventory that has exceeded the rust prevention period or has exceeded the rust prevention period should be cleaned and rust prevention treatment again.

Finished product sealing and rust prevention

1. After assembly, seal the assembly parts that are not disassembled, and use anti-rust lubricating dual-purpose oil to protect them.

2. Packaging parts cannot directly contact the packaging wood. If contact is required, corresponding isolation measures should be taken.

3. When using plastic film packaging, the material should be neutral and should be dry and clean. The inside must be filled with desiccant, such as silicone, and the amount of silicone added is shown in Table 1.

4. Before the product parts are packed and transported, it must be cleaned, and then apply dura film and anti-rust oil twice to the anti-rust surface. If it is a precision part, packaging protection is also required.

5. For small and large parts such as nuts, screws, screws, etc., dip coating method can be used to apply hard film anti-rust oil, and then put it in a special packaging bag or container for protection.

The anti-rust measures for various parts are shown in Table 2.

Inspection of anti-rust quality

1. Quality inspection of the surface cleaning of the workpiece: Wipe the surface of the workpiece with a clean, non-hair or white paper that does not shed or chip-free, and check whether the white cloth or white paper has obvious foreign matter contamination.

2. Quality inspection of anti-rust oil film: The surface of anti-rust oil film should be continuous and uniform after applying, without leakage, bubbles or obvious brush marks.

3. Relevant inspections before The desiccant should not be placed randomly and should be hung around the protected parts.processing mechanical parts to prevent rust: Before packaging and packing, oil films damaged by lifting, fixing and other operations must be repaired.