CN101850380A

CN101850380A - High flanging hole forming method

Info

Publication number: CN101850380A
Application number: CN 201010183224
Authority: CN
Inventors: 黄文喜
Original assignee: SPI PRECISION SUZHOU CO Ltd
Current assignee: SPI PRECISION SUZHOU CO Ltd
Priority date: 2010-05-26
Filing date: 2010-05-26
Publication date: 2010-10-06

Abstract

The invention provides a high flanging hole forming method which has no cracking of the side walls of a formed flanging hole and good flanging effect. The method comprises the following steps of: punching a blind hole in a base material with a punch; processing one through hole in the bottom center part of the blind hold; and flanging the bottom of the blind hole with the punch. The side wall and the flanged bottom of the blind hole are the side walls of the high flanging hole.

Description

High flanging hole forming method

Technical field

The present invention relates to a kind of high flanging hole forming method.

Background technology

Flange is that the Sheet Metal Forming Technology of erectting straight flange is translated at a kind of bore edges or outer rim edge with workpiece.Flange can be divided into two kinds of hole flanging and flangikngs, and the hole that hole flanging forms is called the flange hole.But the three-dimensional part that the method for processing forming machining shape of hole flanging is comparatively complicated, it is widely used in the processing of products such as automobile, retractable door, composite heating radiator and various electronic product casings.

Existing hole flanging method is prior to going out a pre-punched hole on the base material, directly impact pre-punched hole with cylindrical punch then, the pre-punched hole skirt materials is occured bending and deformation and forms the flange hole.

But when the height in flange hole during, carry out punching,, thereby cause the flange failure owing to violent moulding produces the defective of the flange hole sidewall cracking after the moulding with existing method greater than 3 times (being so-called high flanging hole) of the thickness of base material.

Summary of the invention

The purpose of this invention is to provide the high flanging hole forming method that flange hole sidewall can not ftracture, flange is effective after a kind of moulding.

This high flanging hole forming method comprises the steps:

On base material, go out a blind hole with drift;

Bottom centre place in blind hole processes a through hole;

With drift flange is carried out in the bottom of blind hole; The sidewall of blind hole and the bottom of the blind hole behind the flange are the sidewall of high flanging hole.

Characteristics of the present invention are: go out a blind hole earlier, the sidewall of blind hole is the high flanging hole sidewall part of final molding; Again flange is carried out in the bottom of blind hole; Blind hole bottom behind the flange is another part of the high flanging hole sidewall of final molding, and the sidewall of blind hole and the bottom of the blind hole behind the flange are the sidewall of high flanging hole.During the punching out blind hole, material generally can not ftracture; To behind the flange of blind hole bottom the time, resemble common flange hole (non-high flanging hole) flange, material generally can not ftracture.Therefore, the invention has the beneficial effects as follows that the high flanging hole sidewall after the moulding can not ftracture, flange success rate height.

As improvement, c in steps 1 after step b, before the step c ⁰: described through hole is carried out chamfering.Like this, after the flange moulding, just there has been chamfering the lower end of high flanging hole, and need not chamfering again.The more important thing is, when the bottom centre place processing through hole of blind hole, because the rigidity of blind hole is higher, more easily processing.And when the lower end, flange hole after the moulding carried out chamfering, difficulty was bigger.

Description of drawings

Fig. 1 is the base material schematic diagram before the punching out blind hole.

Fig. 2 is the schematic diagram after the punching out blind hole.

Fig. 3 is the schematic diagram after small through hole is gone out in the blind hole bottom.

Fig. 4 carries out schematic diagram after the chamfering to the upper end of blind hole bottom small through hole.

Fig. 5 carries out schematic diagram behind the flange to blind hole bottom.

The specific embodiment

Referring to high flanging hole 6 forming methods shown in Fig. 1-5,

Be to go out a blind hole 2 on the base material 1 of T at thickness earlier with cylindric drift; The internal diameter of blind hole 2 equals to prepare the internal diameter of the high flanging hole 6 of moulding.

5 centers, bottom in blind hole 2 process (can be punching out, also can be other processing methods) small through hole 3.Chamfering is carried out in upper end 4 to the small through hole 3 on the blind hole bottom.

With drift flange is carried out in the bottom 5 of blind hole; The sidewall 7 of blind hole and the bottom of the blind hole behind the flange 8 are the sidewall of high flanging hole 6.The height H of the high flanging hole after the moulding is greater than 3 times of the thickness T of base material.

Claims

1. high flanging hole forming method, it is characterized in that: it comprises the steps:

A. on base material, go out a blind hole with drift;

B. process a through hole at the bottom centre place of blind hole;

C. with drift flange is carried out in the bottom of blind hole; The sidewall of blind hole and the bottom of the blind hole behind the flange are the sidewall of high flanging hole.

2. high flanging hole forming method according to claim 1 is characterized in that: c in steps after step b, before the step c ⁰: described through hole is carried out chamfering.