Extrusion mould used for improving fatigue strength at hole end of metal plate and method

A technology for extruding dies and metal sheets, applied in the field of machining, can solve the problems of low stress elimination efficiency and high processing cost in punching holes, and achieve the effect of ensuring the improvement range, reducing the roughness and ensuring the dimensional accuracy.

Active Publication Date: 2020-11-24
DONGFENG COMML VEHICLE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The embodiment of the present application provides an extrusion die and method for improving the fatigue strength of the hole end of the metal sheet to solve the problems of low stress relief efficiency and high processing cost in the punching hole of the sheet metal in the related art

Method used

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  • Extrusion mould used for improving fatigue strength at hole end of metal plate and method
  • Extrusion mould used for improving fatigue strength at hole end of metal plate and method
  • Extrusion mould used for improving fatigue strength at hole end of metal plate and method

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Embodiment Construction

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be described clearly and completely in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments These are a part of the embodiments of this application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

[0034] The embodiments of the present application provide an extrusion die and a method for improving the fatigue strength of the hole end of a metal sheet, which can solve the problems of low stress relief efficiency and high processing cost of punching holes in the metal sheet in the related art.

[0035] See figure 1 with figure 2 As shown, the first aspect of the em...

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Abstract

The invention relates to an extrusion mould used for improving fatigue strength at a hole end of a metal plate and a method, and belongs to the technical field of machining. The extrusion mould head comprises a pressure head and a mandrel, wherein the pressure head is of a circular table shaped structure, and is positioned in a hole mouth of a through hole for extruding the through hole, so that achamfer is formed at the hole mouth of the through hole; the mandrel is of a tapered or circular table shaped structure and is positioned in the through hole for supporting the through hole, so thatthe through hole defines a set shape and a set diameter; and the upper bottom surface of the pressure head is connected to the lower bottom surface of the mandrel, and the axis of the mandrel is superposed with that of the pressure head. The pressure head can control materials to flow towards the through hole during plastic deformation chamfering, limits the hole end plane from bulging, is beneficial for forming stable residual pressure stress in the through hole, and ensures that a ring-shaped bulge is not formed on the surface of the hole end. The mandrel can avoid naturally forming a ring-shaped bulge or sink in the through hole during plastic deformation chamfering, forms stable pressure stress on the surface of the through hole, and guarantees improvement range of the fatigue strength.

Description

Technical field [0001] This application relates to the technical field of mechanical processing, in particular to an extrusion die and method for improving the fatigue strength of the hole end of a sheet metal. Background technique [0002] As we all know, the holes, grooves and steps on the workpiece will cause stress concentration. According to the introduction of "Machine Design Manual", the stress on the edge of the hole on the vertical surface of the wide plate is three times the average stress. Due to the presence of burrs, tear bands and sharp edges, the tensile, compression or torsion fatigue strength of sheet metal punching holes will be further reduced. [0003] Trimming, shot peening, extrusion, rolling, and chamfering of the punched hole can effectively improve its fatigue strength. This is because the trimming, which may be a fine blanking or machining method, can eliminate the effects of tearing bands and burrs. Shot peening can eliminate burrs, blunt edges, and for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P9/02
CPCB23P9/025
Inventor 高亮庆李少兵郑远宝郑立新杨亮波张先国陈林王恩乐严建光王德财
Owner DONGFENG COMML VEHICLE CO LTD
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