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A Back Extrusion Uniform Deformation Die

A technology of uniform deformation and reverse extrusion, applied in the direction of metal extrusion dies, etc., can solve problems such as unfavorable metal flow and uneven deformation of formed parts, and achieve the effect of improving performance, improving metal dead zone, and achieving significant economic benefits.

Active Publication Date: 2018-12-11
ZHONGBEI UNIV
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  • Abstract
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Problems solved by technology

[0003] Image 6 The flow of metal during the original punch extrusion process simulated for Deform. It can be seen from the figure that during the original punch extrusion process, the metal flow direction is always kept straight down, which is obviously not conducive to the flow of metal. Different degrees of metal "dead zone" will be generated at the corner of the die exit, resulting in uneven deformation of the formed part

Method used

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  • A Back Extrusion Uniform Deformation Die
  • A Back Extrusion Uniform Deformation Die
  • A Back Extrusion Uniform Deformation Die

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention.

[0022] see Figure 2-Figure 5 , the specific embodiment adopts the following technical scheme: a kind of reverse extrusion uniform deformation die, it comprises punch body 1, punch head 2, groove 3 and arch structure 4, the punch head of punch body 1 2 is provided with a groove 3 in the middle, the length of the groove 3 is equal to the diameter of the punch head 2, and an arched structure 4 is arranged in the middle of the groove 3, and the cross section of the arched structure 4 is arc-shaped. With this design, when the punch head 2 is in contact with the surface of the...

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Abstract

The invention discloses a forward extrusion uniform deformation die and relates to the field of metal plasticity forming. A groove is formed in the middle of a male die head of a male die body; an arched structure is arranged in the middle of the groove; the cross section of the arched structure is in an arc shape; the length of the groove is equal to the diameter of the male die head; and the height of the arched structure is the same as the depth of the groove. Friction force between a male die and a billet is greatly reduced, and uniform flow of metal is promoted.

Description

technical field [0001] The invention relates to the field of metal plastic forming, in particular to a mold for promoting uniform deformation of reverse extrusion. Background technique [0002] The grid changes in each stage of traditional back extrusion are shown in Fig. 1. Fig. 1(a) shows the starting state of back extrusion, and Fig. 1(b) shows the change of the grid when the billet whose height is larger than the diameter enters the stable deformation state. At this time, the grid change inside the billet can be divided into three areas: the I area is the metal dead area, which is close to the end face of the punch and has a tapered shape. The size of the taper is determined by the friction between the end face of the punch and the blank. This part of the metal does not deform substantially. Zone II is a severe deformation zone. The blank flows sharply outward and upward in this area, and the cup-shaped part is mainly formed by this part of the metal flow. The axial...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C25/02B21C23/04
CPCB21C23/04B21C25/02
Inventor 张治民于建民白冰董蓓蓓王强郝红元程眉孟模
Owner ZHONGBEI UNIV
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