A reverse extrusion die with back pressure and processing technology using the die

A technology of reverse extrusion and mold, which is applied in the field of cup/tube-shaped parts reverse extrusion processing technology and equipment, can solve the problems of increased scrap rate, lower production efficiency and product quality, and achieve low cost, improved product quality, and easy The effect of maintenance

Inactive Publication Date: 2018-02-06
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The phenomenon of "molding" makes the cup / tube parts unable to be demoulded, greatly reducing production efficiency and product quality; the occurrence of wall cracks leads to an increase in the scrap rate, especially for plastic deformation of magnesium alloys, titanium alloys, high-strength aluminum alloys, etc. Metals with low capacity are difficult to back-extrude to obtain high-quality and high-performance cup / barrel parts

Method used

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  • A reverse extrusion die with back pressure and processing technology using the die
  • A reverse extrusion die with back pressure and processing technology using the die
  • A reverse extrusion die with back pressure and processing technology using the die

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Embodiment 2

[0052] Example 2, this example uses 7075 high-strength aluminum alloy as the experimental material to further describe the specific implementation of the present invention in detail. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0053] The first step: smelting 7075 aluminum alloy round bars, and then performing homogenization treatment;

[0054] The second step: peeling, and using wire cutting to obtain a round bar blank with a length of 25mm and a diameter of 80mm;

[0055] The third step: put it in the heating furnace, the heating temperature is 450°C (the melting point of the alloy is about 700°C), and heat for 2 hours;

[0056] Step 4: Set the downward working speed of the central punch to 2.5mm / s, the initial displacement of the working downward is 25mm, and the final downward displacement is 20mm;

[0057] Step 5: Apply molybdenum disulfide lubricant to the convex and concave die...

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Abstract

The invention discloses a backward extrusion die. The backward extrusion die comprises a top pressing die, a side-pressing male die and a bottom die, the top pressing die comprises a pressing table and a center male die, wherein the center male die is fixed on the lower portion of the pressing table, and the center male die and the pressing table form an integrated structure; the side-pressing male die is arranged on the outer side of the center male die, and the side-pressing male die and the pressing table are arranged together through a spring; the middle part of the bottom die is concaved to form a work space for containing the center male die, the side-pressing male die and a workpiece.

Description

technical field [0001] The invention relates to the technical equipment field of back-extrusion processing of cup / cylindrical parts, in particular to a back-pressure back-extrusion die and a processing technique using the die. Background technique [0002] As an advanced metal plastic forming process with less cutting and no cutting, reverse extrusion has the advantages of high efficiency, high quality, low consumption, and refined grains. It is widely used in cup / tube shapes of aluminum, magnesium, titanium and other non-ferrous alloys and steel materials. Parts or sleeves are formed. The cup / barrel "hugging" phenomenon and cracks in the wall are caused by the back-extruded material undergoing a large plastic deformation process and friction-induced non-uniform deformation. The phenomenon of "molding" makes the cup / tube parts unable to be demoulded, greatly reducing production efficiency and product quality; the occurrence of wall cracks leads to an increase in the scrap r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C25/02B21C23/20B23P15/00
CPCB21C23/20B21C25/02B23P15/00
Inventor 梅瑞斌
Owner NORTHEASTERN UNIV LIAONING
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