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Stamping die and prestress punching process thereof

A kind of prestressing and punching technology, applied in the field of mechanical engineering, which can solve the problems of delamination, block drop, etc.

Active Publication Date: 2020-11-13
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The embodiment of the present invention provides a punching die and its prestressed punching process to solve the problem of delamination and block loss in the tear band on the ordinary punching hole of the medium and thick plate in the related art

Method used

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  • Stamping die and prestress punching process thereof
  • Stamping die and prestress punching process thereof
  • Stamping die and prestress punching process thereof

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Embodiment Construction

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0031] The embodiment of the present invention provides a punching die and its prestressed punching process, which can solve the problem of delamination and block falling of the tear band on the ordinary punching hole of the medium and thick plate in the related art.

[0032] see image 3 and Figure 4 As shown, a punching die provided by t...

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Abstract

The invention relates to a stamping die and a prestress punching process thereof. The stamping die is used for punching a steel plate and comprises a female die, a male die matched with the female dieand a second-stage step positioned above a first-stage step and used for punching the steel plate, wherein a stepped punch is fixed to the male die and is provided with the first-stage step positioned at the lowest end and used for extruding the surface of the steel plate, and the height h of the first-stage step is 1 / 4-1 / 3 of the thickness t of the steel plate. By means of the stamping die and the prestress punching process thereof, layering can be decreased, and further block falling is decreased.

Description

technical field [0001] The invention relates to the field of mechanical engineering, in particular to a die and a prestressed punching process thereof. Background technique [0002] The punching hole obtained by ordinary punching is composed of slump, bright band, tear band and burr. In engineering, the quantitative description of the above components is generally used to characterize the quality of punching hole, such as the proportion of bright band , Burr height, etc. [0003] The tear zone is a tear fracture under the action of shear stress and normal stress. Under normal circumstances, the tear zone of the punching hole of the steel plate is microscopically shear dimples, and there are tear edges around the dimples. Therefore, macroscopically and microscopically, the tear zone is rougher than the bright zone, and is more likely to be the origin of cracks. The existence of the tear zone is one of the main reasons for the low fatigue strength of the punching hole. [00...

Claims

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Application Information

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IPC IPC(8): B21D28/34B21D28/26
CPCB21D28/265B21D28/34
Inventor 高亮庆郑远宝黄新卫李少兵冯继军郑立新刘胜严建光
Owner DONGFENG COMML VEHICLE CO LTD
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