The amount of shifting of the upper and lower die edges of the blanking die is called a gap. The gap has an effect on the shear deformation, the failure process, the quality of the blank, and the die life. The punching clearance is affected by various factors such as the performance of the sheet, the thickness of the sheet, the punching method and the die structure. Generally, the single-side gap takes 10 to 15% of the thickness of the sheet.
Overview Blanking is a stamping process that uses a die to separate a portion of a material or process piece from another piece of material, work, or waste. Blanking is a general term for separation processes such as cutting, blanking, punching, punching, punching, cutting, chiseling, trimming, cutting, cutting, and refurbishing.
A method of stamping a part or blank of a desired shape and size from a sheet. The blanking is to use the cutting edge of the die to cause the sheet to shear deformation and separate along a certain contour line. Blanking accounts for the largest proportion of stamping production. In the blanking process, the sheet itself does not undergo plastic deformation except for the metal near the cut contour, so the part punched by the flat plate is still a planar shape.
The main process punching can be divided into shearing, blanking, punching, cutting, cutting and cutting. 1 Shearing is the cutting of large plates into strips. 2 blanking is to separate the required part from the sheet along a closed separation line. 3 trimming is to cut the flash of the deep drawing. 4 punching is to punch holes, slots and louvers on the sheet.
In addition to blanking, it is often used for direct processing of washers, bicycle sprocket, instrument gears, cams, shift forks, instrument panels, and silicon steel sheets on motors and electrical appliances, and connectors in integrated circuits.
The amount of displacement of the upper and lower die edges of the gap blanking die is called a gap. The gap has an effect on the shear deformation, the failure process, the quality of the blank, and the die life. The punching clearance is affected by various factors such as the performance of the sheet, the thickness of the sheet, the punching method and the die structure. Generally, the single-side gap takes 10 to 15% of the thickness of the sheet.
Blanking cuts The punched cut surface obtained after blanking consists of four parts: the sag angle, the shear plane, the fracture surface and the burr (Fig. 1). The shear plane is formed by plastic deformation, and the surface is smooth and perpendicular to the plane of the sheet. The fracture surface is a rough surface formed by failure, and is not perpendicular to the plane of the sheet, and has a certain inclination angle. Ordinary blanking parts have a dimensional accuracy of less than 5 grades and a surface roughness of about RÎ±50-10.
The precision blanking method uses a precision blanking method to improve the quality of the punched cut surface, resulting in a smooth and vertical shear plane. The essence of precision blanking is to make the material in the deformation zone of the scissors near the edge of the die in a three-way compressive stress state, to prevent the occurrence of fracture, and to realize the separation of the material by plastic deformation. To this end, a strong pressure ring is added to the outer periphery of the blanking, such as the V-shaped beading film in Fig. 2, the die gap is reduced or is a negative gap (the punch is smaller than the die).
When the batch is small, or when punching a thin sheet workpiece having a small thickness, rubber or polyurethane is usually used instead of one edge of the blanking die, and the other edge is used to complete the separation. This method is called rubber punching or polyurethane punching.
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