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A plate forming limit diagram testing device and method thereof

A sheet metal forming and testing device technology, applied to measuring devices, applying stable tension/pressure to test material strength, analyzing materials, etc., can solve problems such as inability to accurately test critical cracking strain, and achieve the effect of simple structure and principle

Active Publication Date: 2017-09-22
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to solve the problem that the critical cracking strain cannot be accurately measured due to the deformation of the plate into a curved surface in the existing measurement technology of the right half of the forming limit diagram

Method used

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  • A plate forming limit diagram testing device and method thereof
  • A plate forming limit diagram testing device and method thereof
  • A plate forming limit diagram testing device and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A plate forming limit diagram testing device includes an upper wedge template 1 , a lower wedge template 2 , a left wedge template 3 and a right wedge template 4 for installing a test piece 5 .

[0050] see figure 1 , the upper wedge template 1, the lower wedge template 2, the left wedge template 3 and the right wedge template 4 are combined together.

[0051] The lower end surface of the upper wedge formwork 1 is a plane, and the upper end surface of the lower wedge formwork 2 is a plane.

[0052] There is a working plane on the left and right sides of the upper wedge-shaped formwork 1, and the included angles between these two working planes and the lower end surface of the upper wedge-shaped formwork 1 are both α.

[0053] There is a working plane on the left and right sides of the lower wedge formwork 2, and the included angles between these two working planes and the upper end surface of the lower wedge formwork 2 are both α.

[0054] There are two triangular groov...

Embodiment 2

[0061] A plate forming limit diagram testing device includes an upper wedge template 1 , a lower wedge template 2 , a left wedge template 3 and a right wedge template 4 for installing a test piece 5 .

[0062] The upper wedge formwork 1 and the lower wedge formwork 2 have the same shape. The left wedge template 3 and the right wedge template 4 have the same shape.

[0063] The upper wedge-shaped template 1, the lower wedge-shaped template 2, the left wedge-shaped template 3 and the right wedge-shaped template 4 are assembled together.

[0064] Both sides of the upper wedge formwork 1 cooperate with the left wedge formwork 3 and the right wedge formwork 4 respectively. Both sides of the lower wedge template 2 cooperate with the left wedge template 3 and the right wedge template 4 respectively.

[0065] The test piece 5 is in the shape of a "cross", and its branches are respectively fixed on the upper wedge template 1, the lower wedge template 2, the left wedge template 3 and ...

Embodiment 3

[0070] A plate forming limit diagram testing device includes an upper wedge template 1 , a lower wedge template 2 , a left wedge template 3 and a right wedge template 4 for installing a test piece 5 . These stencils are all metal plates with the same thickness. The shape of the template referred to in this embodiment refers to the shape of each metal plate surface.

[0071] see figure 1 , the upper wedge-shaped formwork 1 and the lower wedge-shaped formwork 2 have the same shape and the size of each part, and the two are placed symmetrically up and down. The shape and size of each part of the left wedge-shaped template 3 and the right wedge-shaped template 4 are the same, and the two are placed symmetrically.

[0072] The upper end of the upper wedge-shaped template 1 is a connecting handle I101, and the lower end is an isosceles trapezoidal plate I102, which means that the shape of the upper wedge-shaped template 1 is similar to the Chinese character "mountain". see figu...

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Abstract

The invention relates to a plate forming limit diagram testing device and a method thereof, belonging to the technical field of plate forming testing. The forming limit diagram testing device and method of the present invention can realize the test of the right half of the forming limit diagram of a plate on an ordinary tensile testing machine. The forming limit diagram testing device of the present invention is composed of multiple sets of wedge-shaped dies with different wedge-shaped angles. Each set of wedge-shaped dies includes four wedge-shaped dies. The upper wedge-shaped die and the left and right wedge-shaped dies slide and cooperate with each other through the wedge-shaped surfaces, and the lower wedge-shaped die also slides and cooperates with the left and right wedge-shaped dies through the wedge-shaped surfaces. The sample is cross-shaped, and the four ends of the sample are respectively fixed on the upper, lower, left and right wedge-shaped molds. During the experiment, the relative movement of the upper wedge-shaped die and the lower wedge-shaped die drives the left-right relative movement of the left wedge-shaped die and the right wedge-shaped die, thereby realizing the deformation of the sample in a bidirectional stress state.

Description

technical field [0001] The invention relates to the technical field of plate forming testing. Background technique [0002] Sheet metal forming is an important part in the field of material forming, and occupies a very important position in the national economy. The sheet metal is often in a state of plane stress during the sheet forming process, so the forming limit diagram is generally used to measure the formability of the sheet metal, and the forming limit diagram is also an important basis for the formulation of the sheet forming process and the design of related tools and dies. How to accurately obtain the forming limit diagram of sheet metal is an important research direction in the field of sheet metal forming. [0003] At present, the sheet forming limit diagram is mainly obtained by the method of steel mold bulging, as described in the national standard "GB / T15825.8-2008". When using the steel mold bulging method to test the forming limit diagram, it is first nec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N3/02
Inventor 何维均栾佰峰黄光杰刘庆
Owner CHONGQING UNIV
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