Integrated extrusion and equal channel angular shear deformation large strain die

A technology of equal channel corners and shear deformation, applied in the field of channel corner shear deformation processing molds, can solve problems such as loose materials that are difficult to effectively press, lack of compressive stress, etc., and achieve the effect of convenient maintenance and optimized design of the mold

Inactive Publication Date: 2017-11-03
JIANGSU UNIV
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  • Application Information

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Problems solved by technology

[0006] The purpose of this invention is to design a combination of traditional extrusion and ECAP, which can continuously The new extrusion and equal-channel angular shear deformation integrated large-strain processing mold for extrusion and equal-channel angular shear deformation can continuously prepare a large number of materials with fine grains and effectively control the crystal structure to improve material properties. purpose, and to provide the necessary equipment for industrialized production

Method used

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  • Integrated extrusion and equal channel angular shear deformation large strain die
  • Integrated extrusion and equal channel angular shear deformation large strain die
  • Integrated extrusion and equal channel angular shear deformation large strain die

Examples

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example 1

[0037] Example 1: Extrusion and Equal Channel Angle Shear Deformation Integrated Large Strain Die The extrusion channel diameter is 20mm, the extrusion ratio is 4:1, the channel angle is 120°, L3 and Φ 2 It is a 1:1 ratio. The 7075 aluminum alloy can be successfully extruded, and the effective strain and equivalent strain are both normal, the material strain effect is good, and the extrusion force is about 12t, which meets expectations. Figure 4 .

example 2

[0038] Example 2: Extrusion Channel Diameter Φ of Large Strain Die Integrated with Equal Channel Angle Shear Deformation 1 =20mm, the extrusion ratio is 4:1, the channel angle is 120°, L3 and Φ 2 It is a ratio of 1.2:1, L5=40mm, L2 / Φ 1 =0.5, L3=L4, θ=60°, Φ 3 =14mm. The 7075 aluminum alloy can be successfully extruded, and the effective strain and equivalent strain are both normal, but the extrusion force is about 25t, and the jump is large, and the material is difficult to extrude smoothly.

example 3

[0039] Example 3: Extrusion and Equal Channel Angle Shear Deformation Integrated Large Strain Die The extrusion channel diameter is 20mm, the extrusion ratio is 5:1, the channel angle is 120°, L3 and Φ 2 It is a ratio of 1:1, L5=40mm, L2 / Φ 1 =0.5, L3=L4, θ=60°, Φ 3 =14mm. During the extrusion process, the equivalent strain suddenly becomes larger, and the extrusion force is about 10t, but the jump is large, and the expected effect cannot be achieved.

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Abstract

A large-strain mold integrating extrusion and equal-channel angular shear deformation, mainly including an upper mold base (6), a die sleeve (12), a punch (7), a lower mold base (16), and a front core ( 11) and the rear mold core (10) and the working cavity formed between them, including extrusion cavity (17), equal channel corner shear cavity (18), and discharge cavity (19). It is characterized in that the punch (7) and the guide post (3) are installed in the punch fixing plate (8), the upper die base (6) and the punch fixing plate (8) are fastened into a whole, and the front core (11 ) and the rear mold core (10) are embedded in the die sleeve (12), the die sleeve (12) and the guide sleeve (2) are fastened on the lower mold base (16), the front mold core (11), the rear mold Be taper fit between core (10) and die cover (12). The invention can effectively press defects such as material looseness and pores, prepare a large amount of materials with fine grains, and effectively control the crystal structure, so as to achieve the purpose of improving material performance. Simple structure and convenient adjustment.

Description

technical field [0001] The invention relates to a metal material modification processing die, in particular to a processing die for changing the structure and performance of the material by making the metal material firstly squeezed and then subjected to equal-channel corner shear deformation, specifically a pushing Continuous extrusion and equal channel angular shear deformation processing die. Background technique [0002] Since the mid-1990s, Equal Channel Angular Pressing (ECAP) technology has been highly valued by the global material community, and has now developed into an important method for preparing high-performance metal materials. The processing of materials by ECAP technology has the characteristics of large shear force, large shear strain, efficient refinement of material structure and inclusions, and elimination of hole defects. During the ECAP extrusion process, the cross-sectional area of ​​the sample remains unchanged, and the processing The produced mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C25/02B21C23/00
CPCB21C25/02B21C23/001
Inventor 许晓静童浩刘志刚张晓宇蔡成彬黄锦栋居士浩张可人丁清汪成松
Owner JIANGSU UNIV
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