Method for punching high bosses on metal sheets and punch utilized in method

Abstract

The invention discloses a method for punching high bosses on metal sheets, which includes steps of forming bosses, drawing bosses, stacking and filling, and shaping and setting, and particularly includes squeezing a forming region of a base metal sheet to form a projection region, drawing the projection region to the projection direction, squeezing and stacking metal materials in a material refilling region around the forming region of the base metal sheet to the projection direction simultaneously at the post stage of drawing, enabling the stacked metal materials to flow to the projection region, and then continuously drawing the projection region to reach the set height until forming the required high boss. The punch utilized in the method is provided with a working region having a stepped structure, and material filling is realized by squeezing the end face formed by the stepped structure. The materials around the boss forming region are squeezed by external force to flow to the projection region plastically, namely the materials are filled to the main part of the forming boss, so that the common straight height and strength of the bosses are increased and high bosses can also be punched on thinner base metal sheets and prevented from falling off.

Description

【Technical field】 [0001] The invention relates to a stamping and forming technology of a boss, in particular to a method and a punch for stamping a high boss on a sheet metal. 【Background technique】 [0002] In the stamping industry, bosses are often processed on sheet metal products. These bosses are mainly used for assembly positioning or to withstand lateral forces. Forming bosses on precision sheet metals are widely used. Such as figure 1 As shown, the current method of processing the boss on the sheet metal is to press the chamfer at the top of the punch into the sheet metal base material, so that the material in the base material overflows to the concave cavity and forms a deep-drawn hollow protrusion on the opposite side of the base metal. Since the thickness of the base material determines the height of the boss, the height and thickness of the boss formed by the existing process method are limited. Especially when the thickness of the sheet metal is lower than 1.2...

AI Technical Summary

Problems solved by technology

like figure 1 As shown, the current method of processing the boss on the sheet metal is to press the chamfer on the top of the punch into the sheet metal base material, so that the material in the base material overflows to the concave cavity and forms a deep-drawn hollow protrusion on the opposite side of the base metal. Since the thickness of the base material determines the height of the boss, the height and thickness of the boss formed by the existing process method are limited.

Especially when the thickness of the sheet metal is less than 1.2mm, it is very difficult to process the effective straight body height of more than 50% of the material thickness on the sheet metal because there is not enough material to be squeezed into the head of the boss

Moreover, when the high boss is stamped and processed by the existing technology, when the height of the boss reaches the limit of the material thickness, it will easily cause the material to tear, causing the boss to fall off, and it cannot be used for positioning during use, which will cause the entire part to fail.

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