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A uniform and fine-grained treatment method for plates with multi-point reciprocating deformation

A processing method and multi-site technology, applied in the field of material processing, can solve problems such as limiting forming manufacturing and industrial application, affecting secondary processing performance, etc., to improve the uniformity of formed plates, promote dynamic recrystallization behavior, and form a large space Effect

Active Publication Date: 2022-05-27
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current metal sheet preparation processes such as rolling, extrusion-shearing and other methods usually have strong anisotropy, which seriously affects its secondary processing performance, which largely limits the application of this method in forming manufacturing and industrialization.

Method used

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  • A uniform and fine-grained treatment method for plates with multi-point reciprocating deformation
  • A uniform and fine-grained treatment method for plates with multi-point reciprocating deformation
  • A uniform and fine-grained treatment method for plates with multi-point reciprocating deformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Step 1: Machining and assembling the deformation device for slab deformation,

[0059] The deformation device is composed of an upper flat anvil 1 and a replaceable lower die 3. In this embodiment, a curved lower die 3A is used. According to the existing relevant literature, it is known that the deep drawing limit of Ti-6Al-4V titanium alloy is at 400 ℃ The specific LDR is 1.8, the elongation at this temperature is 35%, the width of the camber structure is 5mm in this implementation method, according to the limit drawing ratio, the height of the camber structure is less than 4.5mm, and the single-pass deformation is less than 35%, Assuming that the number of repeated loadings in this embodiment is 6 and the expected cumulative deformation is 80%, the single-pass deformation can be calculated to be 15%, and there are 15 wave-like camber structures participating in the deformation in the final loading pass, which can be calculated as The arc angle, in this experiment, the...

Embodiment 2

[0072] Step 1: Machining and assembling the deformation device for slab deformation,

[0073] The deformation device is composed of an upper flat anvil 1 and a replaceable lower die 3. In this embodiment, a cambered lower die 3A is used. According to the existing relevant literature, the drawing limit ratio LDR of ZK60 magnesium alloy at 250°C is 1.8 , the elongation rate at this temperature is 24.1%. In this implementation method, the width of the camber structure is 5mm. According to the limit drawing ratio, the height of the camber structure is less than 4.5mm, and the cumulative deformation in a single pass is less than 24.1%. In the embodiment, a total of 15 wave-like camber structures participate in the deformation under the last loading pass, and the camber angle can be calculated. Assuming that the number of repeated loading in this embodiment is 4, and the expected cumulative deformation is 80%, the single-pass deformation can be calculated to be 20%. In the final loa...

Embodiment 3

[0086] Step 1: Machining and assembling the deformation device for slab deformation,

[0087] The deformation device is composed of an upper flat anvil 1 and a replaceable lower die 3. In this embodiment, a cambered lower die 3A is used. According to the existing relevant literature, the drawing limit ratio LDR of 7A04 aluminum alloy at 350 ° C is 1.93. , the elongation rate at this temperature is 16.5%. In this implementation method, the width of the camber structure is 5mm. According to the limit drawing ratio, the height of the camber structure is less than 4.825mm, and the cumulative deformation in a single pass is less than 16.5%. In the embodiment, a total of 15 wave-like camber structures participate in the deformation under the last loading pass, and the camber angle can be calculated. Assuming that the number of repeated loadings in this embodiment is 10, and the expected cumulative deformation is 120%, the single-pass deformation can be calculated to be 12%. In the f...

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Abstract

The invention discloses a method for uniform and fine-grained treatment of plates with multi-point reciprocating deformation. The method uses a mold with multiple arc surfaces or spherical convex structures arranged in an array to load the plates in multiple passes. The deformed slab is subjected to circumferential rotation, flipping and misalignment in sequence, and then reloaded. Through multiple reciprocating loadings, uniform and severe plastic deformation occurs in each area of ​​the sheet, which significantly increases the cumulative deformation inside the sheet and realizes the Uniform large plastic deformation (Severe plastic deformation, SPD) in each area. This method promotes severe plastic deformation of the plate in multiple local areas through multi-site reciprocating deformation, which greatly promotes the dynamic recrystallization of the initial coarse grains during the deformation process, breaking them into uniform and fine equiaxed grains, and weakening the texture. structure, to achieve the goal of increasing the strength and plasticity of the sheet and weakening the anisotropy.

Description

technical field [0001] The present application relates to a method in the technical field of material processing, in particular to a method for uniformly fine-graining a plate with multi-site reciprocating deformation. Background technique [0002] Sheet metal occupies an important position in the construction of national infrastructure and is widely used in bridge construction, rail transit, ship transportation and other fields. However, the current sheet metal preparation processes such as rolling, extrusion-shearing and other methods usually have strong anisotropy, which seriously affects their secondary processing performance, which largely limits the method in forming manufacturing and industrial application. Severe plastic deformation (SPD) process promotes the accumulation of large plastic strain inside the material through multi-pass loading, and continuously promotes the breaking of coarse grains into finer deformed grains, which greatly refines the grains and impro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J1/02
CPCB21J1/02
Inventor 张鹏陈刚王宇陈伟张鸿名
Owner HARBIN INST OF TECH AT WEIHAI