In the field of mechanical parts processing industry, generally will use mechanical parts processing drawings, the drawings will indicate the mechanical parts processing procedures, processes and requirements, today we take a look at what mechanical parts processing technology requirements!
First, the contour treatment of the parts.
1, unannotated shape tolerance should be in line with the requirements of GB1184-80.
2, not note the length of the size of the allowable deviation ± 0.5 mm.
3, not noted rounded corner radius R5.
4, not noted chamfer are C2.
5、Sharp corner chamfering blunt.
6、Sharp edge chamfering blunt, remove burr flying edge.
Second, the parts surface treatment
1, the parts processing surface, there should be no scratches, scrapes and other defects that damage the surface of the parts.
2、No defects such as black skin, bump, messy buckle and burr are allowed on the processed thread surface. Before painting, all steel parts
must be free of rust, oxide, grease, dust, mud, salt and dirt.
3、Before removing rust, remove grease and dirt from the surface of steel parts with organic solvent, alkali, emulsifier, steam, etc.
4、The time interval between the surface to be coated by shot blasting or manual rust removal and the primer coating shall not be more than 6h.
5, riveted parts in contact with each other's surface, before connecting must be coated with a thickness of 30 ~ 40μm anti-rust paint. The edge of the lap joint should be closed with paint, putty or adhesive. Due to processing or welding damage to the primer, to repaint.
Third, the parts heat treatment
1, by tempering treatment, HRC50 ~ 55.
2, medium carbon steel: 45 or 40Cr parts for high-frequency quenching, 350 ~ 370 ℃ tempering, HRC40 ~ 45.
3, carburizing depth of 0.3mm.
4、High-temperature aging treatment.
