These preparations must be done before the production of precision castings

2020-12-16 10:58:10

339 次

Precision casting products are basically metal materials, so the surface of their castings is easy to rust. If the surface of the equipment is rusty and it is difficult to clean up later, it will directly affect the use of precision castings. In the processing of precision castings, clean water should be used to clean and soak the workpiece, and the workpiece should be cleaned before chemical degreasing and rust removal. This can clean the workpiece, the precision casting process and the use of cold iron

For precision castings, mechanical methods (such as polishing, rolling, grinding and sandblasting) can be used to remove scale. Some precision castings are treated by this method, and then washed with water to blacken them directly or perform other anti-rust treatments.

There are many holes on the surface of precision castings, and it is difficult to remove oil stains after pollution. If the surface treatment is improper, it will directly affect the entire anti-rust treatment. The anti-rust treatment of castings including copper, iron, aluminum and their alloys will not achieve the expected purpose.

The corrosion or discoloration of precision castings in the atmosphere is directly caused by acid, oxygen and moisture in the air, called rust and rust, which can convert the surface layer of high-strength metals into low-strength compounds. The surface of casting products is usually water or oil to prevent rust. No matter which method is selected during use, the casting should be cleaned in advance to effectively remove surface dirt and directly promote the formation of passivation film.

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