Drawing Die Provided With Slant Blank Clamping Surface

Abstract

A drawing die provided with a slant blank clamping surface, where the drawing die includes a lower die base, a lower die secured on the lower die base, an upper die base, a punch fixing plate secured on the upper die base, a punch secured on the punch fixing plate, where the punch is capable of moving relative to the lower die, and a blank holder capable of moving relative to and in parallel with the punch fixing plate, where a blank pressing surface facing the lower die of the blank holder is provided with a slant surface and/or a lower die surface facing the blank holder of the lower die is provided with a slant surface.

What is claimed is: 
     
         1 . A drawing die provided with a slant blank clamping surface, wherein the drawing die comprises a lower die base, a lower die secured on the lower die base, wherein the lower die is provided with a die cavity, an upper die base, a punch fixing plate secured on the upper die base, a punch secured on the punch fixing plate, wherein the punch is capable of moving relative to the lower die, and a blank holder disposed between the punch and the lower die and capable of moving relative to and in parallel with the punch fixing plate, wherein a blank pressing surface facing the lower die of the blank holder is provided with a slant surface. 
     
     
         2 . The drawing die provided with a slant blank clamping surface according to  claim 1 , wherein the slant surface slants towards a center shaft of the die cavity of the drawing die. 
     
     
         3 . The drawing die provided with a slant blank clamping surface according to  claim 1 , wherein a shape of a cross section of the slant surface comprises an irregular shape. 
     
     
         4 . The drawing die provided with a slant blank clamping surface according to  claim 1 , wherein a shape of a cross section of the slant surface comprises a geometrical shape of a slant line, a slant line plus a horizontal line, a curved line, or a curved line plus a horizontal line. 
     
     
         5 . A drawing die provided with a slant blank clamping surface, wherein the drawing die comprises a lower die base, a lower die secured on the lower die base, wherein the lower die is provided with a die cavity, an upper die base, an upper punch fixing plate secured on the upper die base, a punch secured on the punch fixing plate, wherein the punch is capable of moving relative to the lower die, and a blank holder disposed between the punch and the lower die and capable of moving relative to and in parallel with the punch fixing plate, wherein a blank supporting surface facing the blank holder of the lower die is provided with a slant surface. 
     
     
         6 . The drawing die provided with a slant blank clamping surface according to  claim 5 , wherein the slant surface slants towards a center shaft of the drawing die. 
     
     
         7 . The drawing die provided with a slant blank clamping surface according to  claim 5 , wherein a shape of a cross section of the slant surface comprises an irregular shape. 
     
     
         8 . The drawing die provided with a slant blank clamping surface according to  claim 5 , wherein a shape of a cross section of the slant surface comprises a geometrical shape of a slant line, a slant line plus a horizontal line, a curved line, or a curved line plus a horizontal line.