Drawing Die With Lower Die Provided With Microstructures

Abstract

A drawing die with a lower die provided with microstructures is provided, including a lower die. The lower die is secured on a lower die holder, coordinates with a blank pressing plate to clamp a board and performs drawing processing on the board by using a punch moving relative to the lower die, where a top working surface, a shoulder surface, and a die cavity side wall surface of the lower die include multiple microstructures sunken into the surfaces, or a surface, which touches the board when drawing is performed, of the lower die includes multiple microstructures sunken into the surface.

What is claimed is: 
     
         1 . A drawing die with a lower die provided with microstructures, comprising:
 a lower die, wherein the lower die is secured on a lower die base, coordinates with a blank holder to clamp a blank and performs drawing processing on the blank by using a punch moving relative to the lower die, and the lower die comprises a top, a shoulder adjacent to the top, and a die cavity side wall adjacent to an other side of the shoulder, wherein a top working surface of the top in an area corresponding to the blank holder and a surface of the shoulder comprise multiple sunken microstructures.   
     
     
         2 . The drawing die with a lower die provided with microstructures according to  claim 1 , wherein a surface of the die cavity side wall comprises multiple sunken microstructures. 
     
     
         3 . The drawing die with a lower die provided with microstructures according to  claim 1 , wherein a configuration pattern of the microstructures comprises an irregular pattern. 
     
     
         4 . The drawing die with a lower die provided with microstructures according to  claim 2 , wherein a configuration pattern of the microstructures comprises an irregular pattern. 
     
     
         5 . The drawing die with a lower die provided with microstructures according to  claim 1 , wherein a configuration pattern of the microstructures comprises an array pattern, a radial pattern, or a pattern comprising multiple annuluses. 
     
     
         6 . The drawing die with a lower die provided with microstructures according to  claim 2 , wherein a configuration pattern of the microstructures comprises an array pattern, a radial pattern, or a pattern comprising multiple annuluses. 
     
     
         7 . The drawing die with a lower die provided with microstructures according to  claim 1 , wherein shapes of sunken surfaces of the microstructures comprise an irregular shape. 
     
     
         8 . The drawing die with a lower die provided with microstructures according to  claim 2 , wherein shapes of sunken surfaces of the microstructures comprise an irregular shape. 
     
     
         9 . The drawing die with a lower die provided with microstructures according to  claim 1 , wherein shapes of sunken surfaces of the microstructures comprise a geometrical shape such as a triangle, a square, a trapezoid, an ellipse, a circle, or an annulus. 
     
     
         10 . The drawing die with a lower die provided with microstructures according to  claim 2 , wherein shapes of sunken surfaces of the microstructures comprise a geometrical shape such as a triangle, a square, a trapezoid, an ellipse, a circle, or an annulus. 
     
     
         11 . The drawing die with a lower die provided with microstructures according to  claim 1 , wherein shapes of sunken cross sections of the microstructures comprise an irregular shape. 
     
     
         12 . The drawing die with a lower die provided with microstructures according to  claim 2 , wherein shapes of sunken cross sections of the microstructures comprise an irregular shape. 
     
     
         13 . The drawing die with a lower die provided with microstructures according to  claim 1 , wherein shapes of sunken cross sections of the microstructures comprise a geometrical shape such as a triangle, a square, a trapezoid, a semiellipse, or a semicircle. 
     
     
         14 . The drawing die with a lower die provided with microstructures according to  claim 2 , wherein shapes of sunken cross sections of the microstructures comprise a geometrical shape such as a triangle, a square, a trapezoid, a semi-ellipse, or a semi-circle. 
     
     
         15 . The drawing die with a lower die provided with microstructures according to  claim 1 , wherein sunken spaces of the microstructures are exposed to air. 
     
     
         16 . The drawing die with a lower die provided with microstructures according to  claim 2 , wherein sunken spaces of the microstructures are exposed to air. 
     
     
         17 . The drawing die with a lower die provided with microstructures according to  claim 1 , wherein sunken spaces of the microstructures are filled with lubricating oil. 
     
     
         18 . The drawing die with a lower die provided with microstructures according to  claim 2 , wherein sunken spaces of the microstructures are filled with lubricating oil.