Conical hole forming device, car door forming die and conical hole forming method

Abstract

The invention discloses a conical hole forming device, a car door forming die and a conical hole forming method. The conical hole forming device comprises a punching male die (3), a punching female die, a hole flanging male die and a hole flanging female die (4). The punching male die (3) and the hole flanging female die (4) are connected to a first inclined wedge (2). The punching female die and the hole flanging male die are connected to a second inclined wedge (7). The punching male die (3) and the punching female die are matched so that a through hole of a car door lock catch hole can be formed. The hole flanging male die and the hole flanging female die (4) are matched with each other so that a conical counter bored hole of the car door lock catch hole can be formed. According to the conical hole forming device, the problem that burrs are produced in the conical hole forming process can be solved, the quality of the formed conical hole is improved, and the debugging time of a fitter is shortened.

Description

technical field [0001] The invention relates to the technical field of stamping forming of sheet metal parts, in particular to the technical field of stamping forming of auto parts, in particular to a tapered hole forming device, a car door forming die and a tapered hole forming method. Background technique [0002] Mounting holes on vehicle sheet metal parts, such as door lock holes, have two forms, one is simple punching (flat hole), and the other is tapered hole. The tapered hole includes a conical counterbore part and a through hole part connected to each other, so that the head of the mounting screw can be sunk in the conical counterbore part, and the appearance quality is better. [0003] figure 1 It is a schematic diagram of a car door lock hole forming device in the prior art. figure 1 The shown car door lock button hole forming device includes a hole-turning die a and a hole-turning punch b. During forming, the punching die a and the punching die b are driven by ...

AI Technical Summary

Problems solved by technology

Prone to burrs when pierced

When punching, it is a large-angle obtuse-angle punching with an angle greater than 110 degrees. Obtuse-angle punching is prone to burrs because the cutting edge is not sharp, which affects product quality.

And in the process of punching back after punching, the waste may hang on the punching punch, resulting in the phenomenon of waste rebound. If the waste falls on the wedge, it will cause damage to the wedge

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