Method for improving quality of fracture of blank of high-strength steel
A high-strength steel and fracture technology, applied in the field of stamping technology, can solve the problems of limited product size, huge initial investment, and increased production costs
Active Publication Date: 2014-01-22
SHANGHAI HUIZHONG AUTOMOTIVE MFG
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Problems solved by technology
In addition, the use of a special fine blanking process can improve the surface quality of the end face thickness, but there are certain limitations on the size of the product
And increase the production cost, the initial investment is huge;
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[0019] In the embodiments described later, the high-strength steel is CP800, and the stamped parts are guide rods.
[0020] In order to highlight the characteristics of the embodiments of the present invention, first describe the high-strength steel blanking method before the improvement, as figure 1 As shown, the blanking line of the stamping process is shown as the black line 1 in the figure, and A is the area of poor quality of the blanking fracture, which is easy to cause flanging cracking and seriously affects the part qualification rate.
[0021] Such as figure 2 with image 3 As shown, according to the new method of the present invention, the blanking contour line 2 is partially expanded outwards in the area of poor quality of the blanking fracture to increase the machining allowance. image 3 Among them, the blanking contour line 21 is the blanking position before the expansion, and the blanking line 22 is the blanking position after the expansion. For example, ...
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Abstract
The invention aims to provide a method for improving quality of a fracture of blank of high-strength steel. In order to achieve the method for improving quality of the fracture of the blank of the high-strength steel, the local accurate cutting method after whole blanking comprises the following steps that a, a contour line of the blank in a stretching turnup area where has the high requirement for the quality of the fracture of the blank is expanded outwards in blank design, so that working allowance is increased; b, whole punching blanking is conducted on the blank, an euphotic zone of the fracture is required to account for 10-30% of the thickness of the fracture, and the part, in the stretching turnup area, of the euphotic zone accounts for at least 30% of the thickness of the fracture; c, local accurate cutting is conducted, the increased working allowance is blanked in the stretching turnup area, a gap produced by accurate cutting is 30-50% smaller than a gap produced by whole punching blanking, and according to the punched fracture obtained through machining, the euphotic zone accounts for more than 70% of the thickness of the fracture in the stretching turnup area.
Description
technical field [0001] The invention relates to a stamping process, in particular to a stamping process of high-strength steel. Background technique [0002] With the continuous development of automobile lightweight technology, high-strength steel is more and more widely used in automobile chassis. The use of advanced ultra-high-strength multi-phase steel CP800 in the production of automobile chassis parts is the first application in China, and is currently mainly used in chassis connecting rod parts. The process method of the connecting rod part mainly adopts the process of stamping and forming, and the elongation type flanging is carried out locally. This process form is to achieve radial deformation by continuously reducing the thickness of the stamping blank during the forming process. Relevant studies have shown that the limit of uniform thickness reduction during forming is closely related to the surface quality of the thickness end face during blanking. The larger t...
Claims
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IPC IPC(8): B21D28/02
Inventor 王韬武海鲁成伟方平
Owner SHANGHAI HUIZHONG AUTOMOTIVE MFG