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Metal sheet cupping test method related to strain rate

A deformation speed, cupping test technology, applied in metal processing equipment, analysis materials, strength characteristics and other directions, can solve the problems of insensitive or intuitive timing, large errors, etc., to achieve the effect of improving the forming process performance and the product qualification rate

Inactive Publication Date: 2015-07-08
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because these methods are not sensitive or intuitive enough to judge the timing of crack generation, they can still achieve a certain accuracy in the case of low-speed testing (<20mm / min). Under the high deformation speed of the punching machine, the reflected error is relatively large

Method used

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  • Metal sheet cupping test method related to strain rate
  • Metal sheet cupping test method related to strain rate
  • Metal sheet cupping test method related to strain rate

Examples

Experimental program
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Effect test

example 1

[0026] Example 1: Adjust the closing height of the servo press to 300mm; set the slider speed of the servo press to two stages, the first stage is 100% (the target position is 10mm from the bottom dead center), and the second stage is 10%; the sample Brass plate with a diameter of 1.0mm and a diameter of 98.2mm; the experimental environment temperature is 20°C, a little oil is applied to the upper surface of the sample, four samples are made repeatedly, the test data is recorded, and the average value is calculated to obtain "speed 10%, yellow Copper plate, time-load-travel-speed relationship curve" such as figure 2 shown in figure 2 Draw a straight line parallel to the ordinate through the initial load mutation point A and the penetration load mutation point B, intercept the load line to obtain points C and D, measure and calculate the difference between the vertical coordinates of C and D h=7.14mm , is the change of the actual position of the punch from the moment when th...

example 2

[0027] Example 2: Adjust the closing height of the servo press to 300mm; set the slider speed of the servo press to two stages, the first stage is 100% (the target position is 10mm from the bottom dead center), and the second stage is 80%; the sample Brass plate with a diameter of 1.0mm and a diameter of 98.2mm; the experimental environment temperature is 20°C, a little oil is applied to the upper surface of the sample, four samples are made repeatedly, the test data is recorded, and the average value is obtained to obtain "speed 80%, brass Plate, time-load-travel-speed relationship curve" such as image 3 As shown; similarly measure and calculate the difference h=6.94mm between C and D ordinates, and measure the ordinate value of point E as v=35mm / s. IE(v) = 6.94(35)mm was recorded for this sample.

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Abstract

The invention relates to a metal sheet cupping test method related to a strain rate. The measured cupping test value is related to the strain rate in the test, a test die is mounted on a servo press, and a strain rate variable cupping test is performed according to that the rate of the servo press is variable on the basis of the sine rule; a pressure sensor and a linear position sensor both installed on the test die accept, compute and process pressure and position signals through a monitoring system, and the cupping test value and a corresponding rate rule curve of a sample can be directly displayed on a displayer; and the value of difference between positions of a male die at a cupping point and the rate of the male die at a corresponding penetrated fracture point are read to be used as the cupping test value together. The invention provides a set of conception and method for testing the cupping performance of the strain rate related metal stamping sheet, the experiments on various materials show that the method of the invention can be used for testing the expansion character index of the metal sheet under the condition of variable rate.

Description

[technical field] [0001] The present invention relates to the field of stamping and forming technology and new material development of all sheet metal in automobiles, rails, aviation, ships and other transportation vehicles, instruments and appliances, and new materials. Specifically, it relates to the bulging performance of sheet metal associated with deformation speed. experiment method. [Background technique] [0002] In the context of global energy conservation and emission reduction, the development of new, high-strength, lightweight, and composite panels emerges in an endless stream. With the continuous improvement of the performance of new materials, their forming process performance has always been concerned. In addition to improving the material, the improvement of the formability of the plate can also start from the accurate measurement and monitoring of the forming process parameters. [0003] The determination of forming process performance needs to specify the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/28G01N3/02B21D37/10B21D24/04
Inventor 曹阳根苏钰曹雨楠阮勤超黄晨程光王一伟牛景弘
Owner SHANGHAI UNIV OF ENG SCI
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