Die structure and drawing method

Abstract

The invention discloses a die structure and a drawing method. The die structure comprises a die set, a first blank pressing part, a second blank pressing part, a punch set and a material pressing part; the first blank pressing part and the second blank pressing part are arranged on the die set in a mobile mode; the height of a highest point of the first blank pressing part is higher than that of a highest point of the die set; the height of a highest point of the second blank pressing part is higher than that of a highest point of the first blank pressing part; the punch set is arranged above the die set; the material pressing part is arranged on the punch set in a mobile mode; the material pressing part and the second blank pressing part are corresponding vertically; the height of a lowest point of the material pressing part is lower than that of a lowest point of the die set. The die structure has the advantages of reducing the drawing depth of sheet materials, effectively solving the problems that the sheet materials are easy to crack and the sheet material forming is unstable in the traditional drawing technology and improving the sheet material utilization rate due to the first blank pressing part, the second blank pressing part and the material pressing part which is vertically corresponding to the second blank pressing part.

Description

technical field [0001] The invention relates to the technical field of vehicle manufacturing, in particular to a mold structure and a drawing method. Background technique [0002] It is pointed out in the related art that due to the uneven depth of the overall shape of the sheet, limited by the general drawing process and structure, the binder surface is generally a relatively gentle curved surface and will not change sharply with the depth of the sheet, eventually resulting in the overall shape of the sheet The molding depth is slightly deeper than the deepest position of the product, so as to achieve the purpose of smooth transition of sheet metal forming depth and uniform feeding. [0003] However, due to the deepening of the local forming depth of the sheet metal, the sheet material is stretched more severely during the forming process, and cracking is very easy to occur, the sheet material forming is unstable, and even the sheet material is scrapped, and the large proce...

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Problems solved by technology

[0003] However, due to the deepening of the local forming depth of the sheet metal, the sheet material is stretched severely during the forming process, and cracking is very easy to occur, the sheet material forming is unstable, and even the sheet material is scrapped, and the process supplement here is large, resulting in a decrease in material utilization. , the vehicle manufacturing cost increases

In addition, the pressure force of the blank holder is unstable due to factors such as the accuracy of the machine tool

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