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Method for producing ultra-fine grain by using repeated forging of large deformation

An ultra-fine grain, large deformation technology, applied in the field of preparing ultra-fine grains by upsetting and extrusion large deformation, can solve the problems of cracks, billet tensile stress, etc., to eliminate cracks, deform uniformly, and reduce tensile stress. Effect

Inactive Publication Date: 2009-08-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method suitable for a variety of materials, using two sets of molds for repeated upsetting and extrusion to achieve large deformation of the material to prepare ultra-fine grains, which can overcome the tendency to generate tensile stress inside the blank due to the inhomogeneity of deformation effect, resulting in crack defects

Method used

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  • Method for producing ultra-fine grain by using repeated forging of large deformation
  • Method for producing ultra-fine grain by using repeated forging of large deformation
  • Method for producing ultra-fine grain by using repeated forging of large deformation

Examples

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Effect test

Embodiment 1

[0032] Example 1 Equipment for preparing ultra-fine grains using repeated upsetting and large deformation, including upsetting punch (1), upsetting die (2), upsetting punch (1) and upsetting die (2) connected Together, they are placed on the supporting pad (3). Combine two sets of molds with different cavity sizes, such as figure 2 As shown, two sets of molds are respectively fixed on the hydraulic press. The cross-sectional dimension of the mold 1 cavity is 10mm×13.3mm, and the cross-sectional dimension of the mold 2 cavity is 10mm×10mm.

[0033] The pure copper blank (5) with an external dimension of 10mm×10mm×10mm is annealed in the heat treatment furnace to obtain a pure copper blank with a coarse-grained structure with a grain size of about 50-100 microns, as shown in Figure (3). Repeated upsetting process such as Figure 4 As shown, the blank (5) is placed in the upsetting die (2) of the first set of molds, and the upsetting punch (1) upsets the blank (5) downwards, so that ...

Embodiment 2

[0035] Example 2 The device for preparing ultra-fine grains by repeated upsetting and large deformation is fixed on a mechanical press to increase the pressing speed of the upsetting punch in order to increase the deformation rate of the blank.

[0036] The cross-sectional dimension of the mold 1 cavity is 10mm×11.1mm, and the cross-sectional dimension of the mold 2 cavity is 10mm×10mm. After annealing, the pure copper billet with an external dimension of 10mm×10mm×10mm is first placed in the upsetting die of the first set of molds, and the press of the upsetting punch is 1 mm, so that the blank fills the cavity of the upsetting die , The size of the blank after deformation is 10mm×11.1mm×9mm. After taking out the blank, rotate it 90 degrees, put it into the upsetting die of the second set of molds, press down 1.1 mm of the upsetting punch, so that the blank fills the upsetting cavity, the size of the blank after deformation is 10mm×10mm×10mm , And then rotate the deformed blank b...

Embodiment 3

[0037] Example 3 When the deformation temperature of the blank is relatively high, a correspondingly relatively high temperature of the upsetting die is used. The blank used in this embodiment is Q235, the size of the blank is 10mm×10mm×10mm, and the deformation is performed on a hydraulic press. The preheating temperature when the blank is first deformed is 600 degrees, and the heating temperature of the heating jacket is 400 degrees.

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Abstract

The invention discloses a method for preparing ultra-fine grains by repeatedly upsetting extrusion and large deformation, belonging to the technical field of ultra-fine crystal material preparation. The method comprises: two dies different in size of die cavities are combined; the repeatedly upsetting extrusion and deformation process of stocks in the two dies are realized by controlling the die cavity size of the dies and the deformation size of the stocks; finally the inner microstructures of the stocks are changed into the ultra-fine grains to obtain block materials of the ultra-fine grains. The repeated and polydirectional upsetting extrusion and deformation not only conduce to the refining of the grains but also conduce to the repeated deformation of the two dies, realize large deformation of the stocks and are characterized in that the upsetting extrusion and deformation are suitable for diverse materials and have simple process. Owing to low manufacturing cost and excellent property, the method has strong market competitiveness and popularization and application value.

Description

Technical field [0001] The invention belongs to the technical field of ultra-fine crystal material preparation, and particularly relates to a method for preparing ultra-fine crystal grains by using upsetting and large deformation. Background technique [0002] Ultra-fine-grained materials have good comprehensive mechanical properties due to their good plasticity, toughness and high strength. For ultra-fine grain blanks, the processing method to obtain ultra-fine grains is one of the most critical issues, and it is the main technical problem to ensure that the microstructure of the ultra-fine grains is uniform. [0003] The use of large plastic deformation to prepare bulk ultra-fine crystalline materials has become one of the effective ways to prepare bulk ultra-fine crystalline materials. It uses the shear deformation of the material in the plastic deformation to achieve grain refinement. Below the recrystallization temperature, the interweaving shear deformation causes large-ang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/08C22F1/00C21D7/00
Inventor 詹肇麟刘安强刘建雄廖丕博张玲
Owner KUNMING UNIV OF SCI & TECH
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