Punching device and method for automobile sheet hole expansion tests
A punching device and testing technology, applied in the direction of punching tools, metal processing equipment, manufacturing tools, etc., can solve the problems of rough processing methods and low precision, achieve accurate measurement and improve test efficiency
Inactive Publication Date: 2017-01-11
ANGANG STEEL CO LTD
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Problems solved by technology
[0005] The invention provides a sample punching device and method for automobile thin plate hole reaming test, the purpose of which is to overcome the defects of low precision and rough processing method of the initial round hole in the existing hole reaming test, so as to accurately process the initial round hole , while ensuring the test efficiency, improve the accuracy of the steel plate hole expansion rate determination
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[0025] The punching device for the automobile thin plate hole expansion test of the present invention is based on the material testing machine, and an upper die and a lower die are added. The material testing machine comprises a fixed platform 8, a lifting platform 12 and a guide rail 13, and the lifting platform 12 runs up and down along the guide rail 13.
[0026] The upper die includes a blank holder 3, a guide post 4, a punch 5, a punch 6, an upper die holder 7, a spring 9 and a stud 10. The punch 6 is fixed below the upper die base 7 by bolts, and a punch 5 is arranged in the middle of the punch 6, and the diameter of the punch 5 and the punching hole 11 should be selected correspondingly, both being 6-20 mm. There are 3 guide posts 4, 3 studs 10 and 3 springs 9 at equal intervals (120°) between the punch 6 and the blank holder 3, and the center of the blank holder 3 is provided with a punch guide The edge of the blank holder 3 is provided with a guide post hole and a st...
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Abstract
The invention provides a punching device and method for automobile sheet hole expansion tests. An upper die comprising an upper die base, a male die, guide columns, double-screw bolts, a puncher pin, springs and a blank holder and a lower die composed of a lower die base and a female die are additionally arranged on a test machine. The male die fixed below the upper die base is provided with the puncher pin. The guide columns, the double-screw bolts and the springs are evenly distributed between the male die and the blank holder. The upper die base is fixed below a fixing platform of the test machine. The female die is fixed to the lower die base. Sheet material fixing tables are symmetrically arranged on the outer side of the female die. The centers of the female die and the lower die base are correspondingly provided with punching holes. A sample is placed on the female die, a lifting platform is lifted, sample punching is completed through shear force between the punching hole in the female die and the puncher pin, and sheet material samples with different thicknesses for hole expansion tests and meeting the requirements of GB / T15825.4-2008 standards are punched. By means of the punching device and method, an initial circular hole can be accurately machined, test efficiency is improved, and meanwhile the hole expansion rate of a steel plate can be accurately measured.
Description
technical field [0001] The invention belongs to the technical field of steel plate inspection, and in particular relates to a sample punching device and method for hole expansion test of automobile sheet. Background technique [0002] As the lightweight of automobiles is increasingly valued by automobile manufacturers, some new lightweight materials such as high-strength steel, aluminum-magnesium alloys, and Advanced processing techniques such as forming are also widely used. As a high-strength steel product that still occupies a dominant position in usage, accurate evaluation of its processing and forming properties has become a common concern of steel companies and automobile manufacturers. [0003] During the preparation process of some auto parts, it is often necessary to complete the processing of the process hole before stamping. When high-strength steel is used as the part material, due to the strong internal stress of high-strength steel, local work hardening occurs...
Claims
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IPC IPC(8): B21D28/34B21D28/26
Inventor 徐鑫刘仁东林利丁庶炜郝志强陆晓峰吕冬魏世同李萧彤
Owner ANGANG STEEL CO LTD