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Punching die suitable for cylindrical thin-wall pipe fitting and punching method

A punching die and cylindrical technology, which is applied in the punching die and punching field of thin-walled pipe fittings, can solve the problems of high processing cost, burrs, and low hole processing accuracy, and achieve the effect of long service life

Pending Publication Date: 2021-08-03
SHANDONG MACHINERY DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The accuracy and efficiency of these two methods are very low and there are the following disadvantages: (1) there are burrs around the hole; (2) the hole processing accuracy is low; (3) the processing efficiency is low; (4) the processing cost is high, not suitable for large quantities Production
This scheme has large punching burrs and low punching hole precision, especially for punching thin-walled parts, and serious collapse and deformation around the hole
[0005] Therefore, neither the traditional method nor the utility model patent CN209393812 solves the problem of high-precision punching of thin-walled pipe fittings without dies
In particular, there is no solution to realize die-free punching on carbon steel cylindrical thin-walled pipe fittings with a pipe wall thickness of less than 4.0mm, and to make the surrounding area of ​​the punching hole free of burrs and collapse deformation, and the punching accuracy meets the requirements of the national standard IT10 or above. technical issues

Method used

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  • Punching die suitable for cylindrical thin-wall pipe fitting and punching method
  • Punching die suitable for cylindrical thin-wall pipe fitting and punching method
  • Punching die suitable for cylindrical thin-wall pipe fitting and punching method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The present disclosure provides a preferred embodiment of a punching die suitable for cylindrical thin-walled pipes, such as figure 1As shown, it includes upper template 1, upper mold fixed plate 2, upper mold 3, wedge block 4, fixed mold 5, movable mold 6, support plate 7, support plate reinforcement rib 8, pull rod screw 9, compression spring 10, lower Template 11 and fixing bolt 12, wherein, there is a punching knife 13 at the front end of the upper die, and the punching knife is a double-edged symmetrical parabolic structure. Wherein, the first cutting edge 19 is also referred to as the main cutting edge of the punching knife 13, and is used to achieve symmetrical point-by-point punching of the cylindrical thin-walled pipe 20, so as to achieve no burrs and no collapse deformation around the punched hole. The second blade 18 is used to switch waste materials smoothly into the discharge hole.

[0048] Its working principle is as follows: Put the pipe fitting 20 into ...

Embodiment 2

[0057] This embodiment is a modification of Embodiment 1, such as figure 2 As shown, during the movement of the upper die 3 to punch the pipe 20 , the wedge block 4 drives the movable die 6 to move relative to the fixed die 5 to hold or loosen the pipe 20 . The force when the movable mold 6 holds the pipe fitting 20 comes from the wedge block 4 , and the movement of loosening the pipe fitting 20 is realized by the shrapnel 10 .

[0058] It is worth mentioning that no matter whether the compression spring of embodiment 1 or the shrapnel of embodiment 2 is used, it is to store the energy when the movable mold 6 moves. With the disappearance of the force of the wedge block 4, the movable mold 6 Return to original position to loosen fitting 20.

Embodiment 3

[0060] The present disclosure also provides a blanking method suitable for cylindrical thin-walled pipes, comprising the following steps:

[0061] (a) place a cylindrical thin-walled pipe fitting 20 to be punched in the space formed by the fixed die 5 and the movable die 6;

[0062] (b) When the upper mold 3 and the pipe fitting 20 move toward each other to achieve two-point contact, the fixed mold 5 and the movable mold 6 hold the pipe fitting 20 tightly;

[0063] (c) When punching starts, if Figure 8 ~ Figure 10 As shown, first start cutting from two points where the punching knife of the upper die 3 contacts with the pipe fitting 20;

[0064] (d) The punching knife 13 of the upper die 3 gradually completes the punching in a symmetrical and point-by-point manner;

[0065] (e) When the upper mold 3 and the pipe fitting 20 move relative to each other to achieve complete disengagement, the fixed mold 5 and the movable mold 6 loosen the pipe fitting 20;

[0066] (f) Taking a...

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PUM

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Abstract

The invention provides a punching die suitable for a cylindrical thin-wall pipe fitting. The punching die comprises a fixed die, a movable die and a stamping die, the fixed die and the movable die are matched with each other to form a space, and the space is used for containing the cylindrical thin-wall pipe fitting. The movable die moves relative to the fixed die so as to tightly clamp or loosen the cylindrical thin-wall pipe fitting. A stamping knife is arranged at the front end of the stamping die, the stamping knife is cylindrical and is of a double-edge symmetrical parabola structure, and a discharging hole is formed in the stamping knife to discharge waste generated during punching. The periphery of a hole punched by the die is free of collapse and deformation, and the punching precision can reach the national standard IT10 level or above; the service life of the stamping knife is long; and through matched linkage of the stamping die and the movable die, automatic clamping or loosening of the pipe fitting can be achieved, and the punching die is suitable for large-scale industrial production. In addition, the invention further discloses a punching method for an intersecting line at the end of the pipe fitting so that the punching die can be better utilized.

Description

technical field [0001] The invention relates to the field of moulds, in particular to a punching die and a punching method suitable for thin-walled pipe fittings. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] In industries such as motorcycles, automobiles, and daily hardware, pipe fitting drilling technology is often used. The processing of such holes is not only a large batch, but also most of the holes and other pipe fittings have matching size requirements and very high precision requirements. There are two traditional methods for drilling holes on thin-walled pipe fittings: for small-diameter pipe fittings, drill holes are used; for large-diameter pipe fittings, high-temperature cutting such as flames is used to solve the problem. The accuracy and efficiency of these two methods are very low and there are the following disadvantage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D28/34B21D28/28
CPCB21D28/34B21D28/28
Inventor 杨春秀杨彤彤王修涛王孜翟茜
Owner SHANDONG MACHINERY DESIGN INST