Die punch stamping process has a certain error, the error depends on what factors? Let us learn together:
1, the size of the gap, the average degree: deep drawing, bending, flanging and other sheet metal forming parts usually need to cut out a blank tablet, has also formed punching, cutting a single finished pieces. Homework, blanking, including common punching, cutting, dressing, etc., for each sheet metal stamping parts are necessary. So the blanking gap hedge determines the dimensional accuracy of the contour. Punch small and average blanking gap, punching punch size can be made to obtain a higher accuracy. For deep drawing, bending forming molds, such as a large gap will increase the size of the punch mouth size error and rebound. Clearance is not a common cause of increased punching burrs and uneven edges due to uneven wear.
2, the elastic deformation of punch equipment: in the stamping process, the punch load after a certain degree of elastic deformation. According to the burst pressure change and significant direction of the size of the deformation, but for stamping parts, mainly for stamping, embossing, with volume stamping flat, bump, pressure wave, broken, heading, flange, upsetting, beating, The deep throat is made in the form of workmanship in the form of stamping, a remarkable effect in its dimensional precision stamping.
3. Dimensional accuracy of the punch material, structure, dimensions and material thickness, the dimensions of the blanking gap and the decisive effect of cutting on its average degree. Different types of punching process, different materials with different thickness of the material, one of the six customs clearance, press great difference in punching accuracy. Uniform modulus m = 0,2 mm thick 34, with hole H62 brass pieces of gear in the middle of the compound stamping die, when the gap C = 0,5% ton (unilateral) Of the IT7 level, salt pieces of flat arch bending, up to 89 of the blunt verticality, 5 degrees, the surface roughness Ra value is 0,2 micron stamping size; with ordinary composite die manufacturing, the gap C = T (unilateral) 5%, the initial error of the punch, the punch of the initial precision stamping die for a T9,12 Ra value, 5 microns, 0 burr height of the rough cutting surface roughness, 10 mm; stamping die is still a continuous system , The initial punching precision IT11 blunt edge is thicker. Under normal circumstances, hot stamping material and T thickness of the main basis for selection blanking gap. Once the open punch gap is selected to determine the constant error of the planar dimensions of the body of the punch; the stiffness of the salt piece structure and the three-dimensional shape affect its accuracy.
Different types of drilling structures are different, and thus the thickness of the shared material and manufacturing precision stamping differences, press punching constant error is also different.
UncategorisedOctober 20, 2016