Stretching technology for processing high-tension material parts and stretching mould thereof

Abstract

The invention requests for protecting a drawing process and a drawing mould for processing parts made of high intension material. The mould comprises an upper mould, a lower mould, an edge pressing coil and an ejector pin. Aiming at overcoming the disadvantage of the structure of the mould, a drawing gluten on the upper mould or the edge pressing coil is changed into an independent process bulging gluten, which is fixed on the two sides of the lower mould. And a groove for the process bulging gluten to pass through is corresponding opened on the edge pressing coil. The height of the process bulging gluten is about larger than that of the binder surface of the edge pressing coil when the edge pressing coil runs to a lower dead point, and the process bulging gluten is controlled to be higher than the binder surface of the edge pressing coil for 10 to 25 mm or so. The lower end of the process bulging gluten is connected with an adjusting gasket. The invention is mainly applied for molding parts of high intension whose tensile strength is more than 600MPa, and makes the plates fully plasticizing deformed in the drawing process of the parts made of high intension material so as to reduce the possibility that the parts are rebounded and twisted, thereby achieving the purpose that the size of the parts is fixed.

Description

【Technical field】 [0001] The invention relates to a mold structure and technology. 【Background technique】 [0002] In order to reduce vehicle exhaust emissions and improve collision safety performance, current vehicle designs strive to reduce the weight of various parts of the vehicle as much as possible while ensuring vehicle safety. In view of this, the use of high-tensile materials will become the trend of automotive materials. [0003] According to the international research on ultra-light steel vehicles (ULSAB-AVC), the yield strength is set at 210-550N / mm 2 The steel plate within the range is called high-strength steel plate (ie high-tensile material); the yield strength is greater than 550N / mm 2 The steel plate is called ultra-high strength steel plate. According to different strengthening mechanisms, it is divided into ordinary high-strength steel plates and advanced high-strength steel plates. Among them, ordinary high-strength steel plates mainly include high-s...

AI Technical Summary

Problems solved by technology

However, there are currently four difficulties in the molding of high-tension parts: 1. The molding pressure is high, and the ordinary press cannot meet the requirements of the molding force; 2. The molding simulation is not accurate. The results provided by the software are not practical

3. The forming limit is strictly limited. High-tensile materials are commonly known as "double high", with high tensile limit (tensile strength above 600Mpa) and high yield limit.

Therefore, the drawing depth of closed drawn parts is limited

4. The accuracy of parts is difficult to control, and the accuracy is difficult to reach the ideal value due to the rebound and distortion of parts

[0004] According to the applicant's research on the application of the existing ordinary sheet metal forming dies to the forming of high-tensile material parts, it is found that among the ordinary forming dies used, the structure of the drawing die has a greater impact on the forming of high-tensile parts

Existing drawing dies have the methods shown in Fig. 1-Fig. 3, and they are all provided with drawing beads 4 on the blank holder 2 or the upper die 1. The disadvantage of this structure is that when the die moves downward, the pressing When the edge ring 12 presses the material to death and moves downward, the drawbead 4 has already started to act on the material 3, see Figure 2, so that the plate does not have sufficient plastic deformation, and the shape of the process part is not strong. When the part is trimmed The phenomenon of rebound and distortion after the process is serious, so in order to overcome the phenomenon of rebound, higher requirements are put forward for the plastic mold, thus increasing the manufacturing and debugging cycle of the plastic mold

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