Inspection key points of each process of precision metal stamping parts

1. Inspection basis: 'Operation Instructions2. Judging standards: 'Product Defect Classification Table3. Inspection items and inspection tools: 1. Appearance inspection 　　　 1. Inspection basis: 'Operation Instructions　　 2. Judging standards: 'Product Defect Classification Table　　3. Inspection items and inspection tools: 　　1. Appearance inspection: generally use visual inspection, hand feeling, limited samples, etc. for verification.　　 2. Dimension inspection: generally use calipers, micrometers, plug gauges and other measuring tools to verify.　　3. Structure inspection: generally use tensioner, torque device, pressure device and other measuring tools to verify.　　 4. Characteristic inspection: such as electrical, physical, chemical, and mechanical characteristics, which are generally verified by testing instruments and specific methods. 4. Inspection key points of each process and common undesirable phenomena: 　　1. Cutting and cutting: 　　 (1) Wrong raw materials (copper, brass, aluminum, etc.). 　　 (2) Whether the specifications and dimensions match the diagram (such as plate thickness, product　　 (3) Peripheral cuts are uneven, too high, and too hard (aluminum plate, aluminum profile type must be within 0.1mm, and iron plate, copper, tinplate must be within 0.05mm). (4) Whether the surface of the material is broken, blistering, scratched, damaged, oxidized, black spots, etc.. 　　 (5) Whether there are scraps on the shearing machine and the mold, or damage the material. 　　 (6) The hardness and state of the material (such as Hard copper, soft copper, etc.).　　2. Punching: 　　(1) The hole position does not meet the requirements of the drawing (a hole has at least two sizes to determine the position). 　　(2) Whether the hole type conforms to the drawing, such as light hole (pass Holes), flanging holes (pumping holes), tapping holes. 　　(3) Whether the size of the hole meets the requirements, such as tapping holes M4, M3, M2, #6-32, etc. bottom holes. 　　(4) Number of holes Whether it is correct (leak punching).　　(5) Whether there is blistering, cracking, burr on the edge of the hole, whether the orifice needs to be punched and chamfered and its size.　　(6) Flanging hole, pay attention to the flanging direction, and the flanging hole is flat　　(7) Whether the punching sequence is correct (whether there is avoidance and whether it affects the size of other parts).　　(8) Punching and breaking the needle until there is no hole or no burring, Or the flanging is not in place. 　　(9) When punching, there is waste on the needle tip, which damages the product; or the punching waste pops up on the mold or product, damaging the product; or the punching waste blocks the mold cavity and damages the product. 3. Red protruding buds: 　　(1) Whether the size, height and number of protruding buds are correct. 　　(2) Whether the size between the protruding buds and the protruding buds meets the requirements. 　　(3) Whether the protruding buds can fit into the corresponding feet ;Whether the feet are perpendicular to the product section; whether the feet swing large after being installed. 　　(4) Whether the length of the feet sticking out of the product meets the requirements after the feet are installed. 　　4. Wording: 　　(1) The writing is clear, complete and free of defects Phenomenon (such as '7' is '乛'). 　　(2) font size is consistent with product material number (such as '' is different from ''). 　　(3) Whether the position and direction of the handwriting conform to the figure. 　　(4) There is a leak Word or punch mark status (such as missing “factory” mark). 　　 (5) Whether the product is deformed or damaged during punching. 　　 5. Forming: 　　 (1) Whether the forming size is consistent with the figure. 　　 (2) Whether the forming angle is biased Large and small. 　　 (3) The forming is not in place, the R angle is too large, and the depth of the punch is the best. 　　 (4) Whether the direction of feeding (batch front) is correct. 　　 (5) Whether there is obvious indentation after forming , Or scratches, damage, or deformation. 　　(6) The order before and after forming is out of order, or miss forming. 　　(7) Whether the material will break after forming (such as the convex position of the isolation cover, the copper sheet is formed). 　　(8) Mold avoidance during forming Whether the size of the space is sufficient, whether it will damage the threaded holes, positioning posts, etc. Previous post: Introduction to the processing and use of metal stamping parts