Torsion-extrusion composite strong-plastic forming method and technological device

A process device and plastic work technology, which is applied in the field of metal plastic processing, can solve problems such as difficult to form high-performance plate/tube components, and achieve the effect of avoiding grain growth and large plastic deformation

Active Publication Date: 2018-10-30
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a torsion-extrusion composite strong-plastic forming method and process device for pr

Method used

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  • Torsion-extrusion composite strong-plastic forming method and technological device
  • Torsion-extrusion composite strong-plastic forming method and technological device
  • Torsion-extrusion composite strong-plastic forming method and technological device

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example 1

[0030] Example 1: A method and process device for twisting-extrusion strong plastic forming of a magnesium alloy cylindrical part are described in detail with reference to the accompanying drawings.

[0031] Such as figure 1 As shown, the torsion-extrusion composite strong plastic forming process device of a magnesium alloy cylindrical part, the extruded blank is cylindrical, such as image 3 Shown. The steps of forming process equipment are:

[0032] Step 1: Fix the upper mold seat cover 6, the punch 9 and the backing plate 7 on the upper template 8 by bolts;

[0033] Step 2: Fix the upper template 8 to the slider of the hydraulic press, and fix the lower template 2 to the workbench of the hydraulic press;

[0034] Step 3: Install the rolling bearing 3 in the groove of the lower template 2;

[0035] Step 4: Fix the lower die 4 on the lower template 2;

[0036] Step 5: Install the rotating head 1 on the rolling bearing 3 and place it in the die hole in the center of the lower die 4;

[0...

example 2

[0043] Example 2: Combination Image 6 To illustrate this embodiment, the described magnesium alloy plate-shaped part twist-extrusion composite strong plastic forming process device, the extruded blank is a square block, such as Figure 7 Shown. The combined die of this example is composed of an upper die 5 and a lower die 4; the combined die is fixed on the lower template 2 through the lower die sleeve 12. When the blank 10 is extruded, the extrusion speed is V 2 , The rotating head speed is W 2 , The metal at the lower end of the blank 10 is subjected to the torsional shearing action of the rotating head 1 to obtain a fine-grained structure. As the extrusion deformation continues, the metal starts to flow along the concave mold cavity to both sides to form a plate 13, such Figure 8 Shown.

example 3

[0044] Example 3: In the seventh step of this example, the blank 10 is aluminum and its alloys, titanium and its alloys, and hard-to-deform lightweight metal materials with better plastic processing performance.

[0045] It should be noted that the specific type of components with complex features to be formed depends mainly on the cavity characteristics of the combined die.

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Abstract

The invention provides a torsion-extrusion composite strong-plastic forming method and a technological device, and belongs to the technical field of metal plastic processing. The method combines the advantages of high-pressure torsion fine crystal and extrusion forming, the blank is simultaneously subjected to high-pressure torsion and extrusion, the metal at the lower end of the blank is violently sheared, so that crystal grains are mechanically broken, meanwhile, the temperature rise generated by plastic work and friction power enables the dynamic recrystallization to be refined and the metal plasticity is improved; a large extrusion force is applied to enable the metal to generate plastic flow, and then a high-performance component is obtained through corner deformation in a cavity of aprocess device, and accurate control of property forming and shape forming of the technological process is achieved; and the process device mainly comprises a male mould, a combined female mould, a rolling bearing and a rotary head with a special shape. According to the method and the device, crystal grain refining capacity is strong, the crystal grain growth caused by the heating link of the blank can be avoided by shortening the heating process.

Description

Technical field [0001] The invention belongs to the technical field of metal plastic processing, and relates to a torsion-extrusion composite strong plastic forming method and process device, in particular to a torsion-extrusion composite strong plastic forming method for processing high-performance plate / cylinder components And process equipment. Background technique [0002] With the continuous research and development of advanced aircraft such as large aircraft and large rockets, it is urgent to develop advanced forming methods for complex and high-performance components to meet the urgent requirements of overall weight reduction and high reliability. For example, the typical cylindrical parts of spacecraft have harsh environmental conditions and have certain requirements for bearing loads. They are one of the important structures that affect the weight and operational reliability of new models. There is an urgent need to adopt high-strength lightweight alloys to meet the high...

Claims

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Application Information

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IPC IPC(8): B21C23/00B21C25/02
CPCB21C23/001B21C25/02
Inventor 孙朝阳李广东钱凌云孙志辉苏泽兴蔡贇李昕童
Owner UNIV OF SCI & TECH BEIJING
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