Talking about the anti-rust treatment method of machining workpieces of mechanical parts

At present, many domestic machinery manufacturers do not pay enough attention to the anti-rust treatment of mechanical parts. In the process of processing, processing, inspection, storage, etc., the processed workpiece is prone to rust due to humid air, hand sweat and contact with harmful gases in the atmosphere, resulting in scrap or rework of the processed workpiece, which greatly increases the unnecessary waste of the enterprise. manufacturing cost. Today, let's talk about the rust prevention in the whole process of mechanical parts processing.

The possibility of corrosion of mechanical parts mainly exists in the processing process, assembly process, inventory and the final packaging and delivery process of the product. The rust-proof treatment method between each process and how to check the rust-proof quality will be explained in detail below.

Anti-rust between the first process

1. Anti-rust measures in the cutting process: Emulsified cutting fluid with cooling, lubricating and anti-rust functions is used. Up to 5-6 days.

2. For workpieces whose turnover time between each process exceeds 5-6 days, the machined surface should be protected with 102 anti-rust and lubricating oil during the turnover period.

Anti-rust in the assembly process

1. The machined surface processed at the suture should be pre-coated with 102 anti-rust and lubricating dual-purpose before assembly Oil, for assembly to prevent rust.

2. When the parts are rusted before assembly, according to the surface rust condition and roughness, as well as the different precision requirements, first use gauze or abrasives of different sizes to remove rust, and then carry out rust prevention. deal with.

3. Before the hydraulic system of the reducer is commissioned, oil is injected into the reducer as required. During the test, 30% 102 anti-rust oil can be injected for the anti-rust treatment of the internal parts and pipelines of the reducer. Cold-drawn, hot-rolled, hot-bent or welded prefabricated pipes that have not been treated with anti-rust treatment should be degreasing, pickling, neutralizing, water-washing and anti-rust treatment before assembly, and only stainless steel pipes should be pickled after welding. No pickling of stainless steel pipes, no pickling of stainless steel pipes and steel pipes, and no rust prevention. For pipes that have undergone pickling and phosphating treatment, only the outer surface processed by CNC can be coated with anti-rust paint; pickling treatment should be carried out in a pickling tank with corresponding buffer solution, and then rinsed. After the test run, all the pipes laid on the machine that will not be dismantled, the dismantled pipes and valve holes should be blown clean or dried with compressed air, and the pipe holes and valve holes should be sealed after drying.

Anti-rust in stock of finished parts

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

2. When the finished product is put into storage, after surface cleaning treatment, it should be coated with 102 BY protective lubricating dual-purpose oil for protection, and re-protected every 10 days; for the inner cavity that can be sealed, 102 protective oil should be coated. For rust oil protection, precision parts that have a long storage time should also be coated with anti-rust packaging.

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

4. If the inventory exceeds the rust-proof period or the inventory exceeds the rust-proof period, the cleaning and rust-proof treatment should be carried out again.

The finished product is sealed at the factory to prevent rust

1. The assembly parts that are not disassembled after assembly are sealed and protected by anti-rust and lubricating oil .

2. The 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, dry and clean, and the interior should be filled with a desiccant, such as silica gel. The amount of silica gel added is shown in Table 1.

4. Before the product parts are packaged and transported, they must be cleaned, and then the rust-proof surface should be coated with a hard-coat rust-proof oil twice. If it is a precision part, packaging protection is also required.

5. For the processing of small and large pieces such as nuts, screws, screw rods, etc., dipping method can be used to apply hard film anti-rust oil, and then put them into special packaging bags or containers for protection.

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

Inspection of anti-rust quality

1. Quality inspection of workpiece surface cleaning: use clean, lint-free, lint-free white cloth Or wipe the surface of the workpiece with white paper, and check whether the white cloth or white paper has obvious foreign matter contamination.

2. Quality inspection of the anti-rust oil film: After the anti-rust oil film is painted, the surface should be continuous and even, without leakage, blistering and obvious brush marks.

3. Relevant inspection before machining of mechanical parts as anti-rust parts: Before packaging and packing, the oil film damaged by lifting, fixing and other operations must be repaired. Desiccant should not be placed randomly and should be hung around the protected parts.