【正文】 Shangqiao, the greater the gap, bending and Shangqiao more serious, in the convex sheet metal, die cutting edge angle formed the initial collapse, then the internal material Stress has not been more than elastic limit, when the external force can be removed after the material restitution. This phase known as the elastic deformation stage. The initial collapse Kok Kok permanent collapse The second stage of plastic deformation, forcing the strength beyond the limit, a broken crack. When the punch to the pressure, the pressure increased, the stress within the material also will be increased, the stress within the material to yield the limit when it entered the plastic deformation stage. At this stage in the punch squeeze into the material with the depth gradually increase, the extent of plastic deformation is also gradually increasing. Office space on the edge because of the existence of internal stress and the moment have increased, so that deformation zone material hardening intensifying, near the edge of the material due to stress and stress on the role of microcracks began to appear, at this time, Blanking deformation force also reached the maximum. The emergence of microcracks that began destruction of materials, plastic deformation stage has ended. And a sheet of bright vertical band and the initial Burr. The third stage separation stage microfracture cracks continued to expand in the material extension of coincidence, the fracture separation. Punch continues to decline, has generated, the microcracks under growing internal extension to the material, when, under the crack met coincidence, off a rough start from the fault zone, when the punch Zaiwang decline, Chong Some dieout of the hole, thus, the pickup punch to plete the whole process of blanking. Taper with a rough and the beginning of the fault zone Burr longer. Second, blanking of the general section features: 1 with the collapse of angle from the main stage of a single deformation of the collapse of the initial angle, driven edge plastic deformation stage. 2 have a bright band on the stage of plastic deformation, a crosssection smooth formation, is the best quality of the section. 3 fault tear caused by the rough surface and dull, with a taper. 4 Burr area have cracked when they have a microburr. Third, features and material (sheet metal materials) of plastic: Section by blanking the quality of the different conditions and different, such as: Cutting Edge space, edge shape, cutting edges of the punching power, lubrication, sheet metal quality (surface quality), sheet metal type (performance). Stamping production requirements of a greater punch with bright, the ruler of the region to reduce the width of fault. Plastic materials as possible, bright with the greater fault less, while Burr has also increased fillet.The main ponents punching die 1 Diefour ponents: onBlock, underBlock, . Case. Model does not include: 1) rearguided model planes, not a smooth sliding from top to bottom, 3 to feed, suitable for small pieces of salt into. 2)I. the middle: a smooth sliding from top to bottom, wide application, can only be oneway feed. 3)I. angle: the steady decline, vertical and horizontal feed, suitable for large production. 4) 4I.:oriented high accuracy, smooth, for large parts or special highprecision punching the workpiece. Dieinstalled to prevent misuse when the main turn 180 degrees, with the exception of reardieguided, will die in twosets lead the guidedsize in diameter cause, a difference of 2 ~ 5 MM. 5)Ball I. 1, Die Block: standard parts, materials, iron HT2547, A3, A5 requires adequate and stiffness. Dimension determination: 1) graphics, die in diameter than the foreign ministers of the 30 ~ 70 mm. 2) rectangle, the length of the die than the length of the 40 ~ 70 mm. Width and die the same or slightly larger than needed for the guidedguided set aside sufficient installation location. 3) die on the stalkBlock, do not have to stay solid for the installation of clips from the Boss, its shape can be relatively narrow. Blockwidth: 1, Die Block: Hs = Hx = (1 ~ ) Ha One Hs die on the thickness of Block Hx underseat thickness Ha die thickness Block on the thickness of parable underBlock, slightly thin 2, guided and guidedsets: the Senate on the 20th of carbon steel fire front. HRC58 ~ 62 Carburizing of ~ mm. I. Introduction setswith the gap with size: from Tuaoestablished between the precision. 1) t gap between the lessTuao determine the accuracy of 2) t = ~ by H / hb preparation 3) t by H / hb from top to bottom with the preparation of a model by H / rb meet 3. Die stalk Die stem length and the diameter d H should be chosen by the installation of punchhole diameter stalk match A3 monly used materials, or 45, A5 steel. Four Die stalk forms: pressureinstalk (H / hb and die with stem mounting holes), Screwinstalk, stalk flangemode, floatingstalk. Second, other parts 1. Punch fixed plate Punch the board because of the size of understamping the workpiece dimensions, and the discharge board the same or smaller form factor, and to consider fastening screws and pin position. Thickness: h3 = ( ~ ) Ha Of which: h3 punch fixed thickness (mm) Ha die thickness. (mm) Asked board fixed the punch in the face to be removed from top to bottom and vertical centertype material A3, A5. 2, Dianban when the punch and die on the Block, then the pressure beyond the angle surfaceBlock of allowable pressure and the need to die between Block with the main mode of higher Pad and the beginning of its fixedpunch The same. H is for the thickness of 3 ~ 10 mm Materials: 45