Lathe precision parts processing common polishing method

Polishing processing is a processing technology for surface modification when machining shaft precision parts, and this processing method should also pay attention to beauty and practicality. Simple shaft polishing refers to a method of modifying the surface of the workpiece with a file, emery cloth, and sandpaper.

In shaft machining, when there is a slight difference in the size or surface roughness of the machined surface, due to the accuracy of the machine tool or the tool and other reasons are not suitable for high-speed fine turning, then the surface of the workpiece can be polished with a file, emery cloth and sandpaper to change the micro size or increase the surface finish, so that the size is qualified or the surface roughness value is reduced.

Turning the forming surface with two-hand control method, due to the uneven manual feed, the surface of the workpiece is easy to leave uneven filing marks, in order to achieve the required surface roughness, after the workpiece is turned, there is a rough file correction and fine file trimming. The pressure of the file should be uniform and consistent, and the force should not be too large, otherwise the precision parts processing workpiece will be filed into a convex and unrounded state.

When filing with a file on a lathe, the filing allowance is generally about 0.05mm, and the allowance is large, and it is easy to file the workpiece. At the same time, for safety, when filing, the left hand should hold the handle, the right hand should hold the front end of the file to file, to avoid hook clothing injury to people, the speed of pushing the file is generally 40 times / min, not fast. When the speed is too high, it is easy to grind blunt files; When the speed is too low, it is easy to file the workpiece. When using the file, remember not to touch the chuck.

After filing, polish with an emery cloth. The emery cloth applied on the lathe is generally made of corundum sand grains. According to the thickness of the sand grains, the emery cloth used is No. 00, No. 0, No. 1 and a half and No. 2, the smaller the number, the finer the particles. No. 00 is fine emery cloth and No. 2 is coarse emery cloth.

In general small-size shaft processing, when polishing the surface of the workpiece with an emery cloth (sandpaper), Mingyue's special tools are only polished with a hand-held emery cloth (sandpaper), but you must pay attention to safety. There are generally two ways to polish with an emery cloth (sandpaper) in your hand, drag the two ends of the emery cloth by hand, or wrap the emery cloth on the wooden board and other objects, polish the workpiece, it is strictly forbidden to wrap the emery cloth around the workpiece, or hold the emery cloth with both hands to polish the workpiece tightly, this is easy to clamp, the fingers are rolled between the emery cloth and the workpiece, causing personal accidents.

When polishing work with emery cloth, the emery cloth pad is generally carried out under a file, which can ensure safety without affecting the quality of precision parts processing.