High precision metal stamping die clearance hedge cutting surface quality has the effect of how to decide

High precision metal stamping die cutting, is based on the metal plastic deformation, the use of punching die for the sheet metal processing to get the parts needed to shape and size. Dongguan precision electronics co. , LTD is a professional research and development and production of mold manufacturer, the following mold clearance hedge introduce under the influence of the cutting surface quality. Blanking process of blanking clearance is reasonable, will decide whether the fracture and crack, shear force equilibrium, and determine the size of the burr. Therefore, mold design, manufacturing and installation must ensure uniform clearance, the same manufacturing process of convex concave die clearance should be kept in a reasonable range. Otherwise, the mold will be part of the quality of clearance is too large and too small. 1, reasonable clearance: when the convex and concave clearance fit, convex and concave die cracking along the direction of maximum shear stress near blade can meet in blanking process, although at this time section and the material surface is not perpendicular, but still relatively flat, smooth, burr, smaller parts of section 2, the gap is too small: better quality clearance, small bending deformation zone is small, high compressive stress components. Produced by die near the edge crack into the punch below the compressive zone and stop development; Produced by punch near the edge into a concave die crack on the surface of the compressive stress area and stop developing. Upper and lower crack don't overlap. In the crack between the two materials will be the second shear. When the crack on the pressure into the concave die, die wall extrusion, produce the second euphotic zone, at the same time part of the material being squeezed out, burr in form a thin and tall. Clearance after hours, although small bending Angle is small, arch collapse, but the quality section have drawbacks. Such as central section a sandwich, two head euphotic zone, in the end have long burr. Gap is too small: crack don't overlap; Material secondary shear; The section form two shear plane; Acting big. 3, the blanking clearance is too large when the gap increases, the tensile stress within the material increases, the tensile fracture occurs early, so the fault zone width; Narrow euphotic zone; Bending deformation increases, so bending Angle and arch collapse also increased. Clearance is too large, because bending moment is big, high tensile stress component, the material in the convex and concave die cracking near the edge is no coincidence. After the separation of slope fault increases, parts of cross section in two Angle alpha 1 and alpha 2, cross section quality is not ideal. And, because the flat Angle of big, big arch bending, shining with small, burr was tall and thick, lower quality of blanking pieces. Clearance is too large: crack don't overlap; The material by the tensile deformation area; Shear plane is small; Tear face big, feather a lot; The poor quality of cross section. Dongguan precision hardware electronic have take company in r&d and production mold, have a professional senior design team, accurate, rapid and high quality to complete your needs.