Press hardening die cooling device

Abstract

The present invention relates to an apparatus for a press hardening die which has a structure improved to decrease cooling rate of trimming portions in pressing a steel plate blank for manufacturing a part for press hardening. A press hardening die cooling device according to an embodiment of the present invention includes: a press hardening die composed of upper and lower dies equipped with cooling water suppliers therein to press a steel plate blank from the top and the bottom; and a cooling water temperature adjuster disposed between the cooling water suppliers of the upper and lower dies and the contact surface of the steel plate blank to adjust temperature of cooling water supplied to the steel plate blank.

1 . A press hardening die cooling device, comprising:
 a press hardening die including upper and lower die portions and configured to press a steel plate blank;   a plurality of cooling water suppliers spaced apart from each other in the upper and lower die portions and forming channels through which cooling water flows; and   a cooling water temperature adjuster configured to adjust temperature of the cooling water supplied to the cooling water suppliers.   
     
     
         2 . The press hardening die cooling device according to  claim 1 , wherein the cooling water temperature adjuster includes a controller configured to operate such that cooling water is supplied at a higher temperature to one of the plurality of cooling water suppliers close to a trimming portion of the steel plate blank than the other cooling water suppliers among the plurality of cooling suppliers, and wherein the controller includes a heater configured to heat the cooling water supplied to the cooling water supplier close to the trimming portion. 
     
     
         3 . The press hardening die cooling device according to  claim 2 , wherein the controller configured to control the heater to maintain the temperature of the cooling water supplied to the cooling water supplier close to the trimming portion between 45 and 80° C. 
     
     
         4 . The press hardening die cooling device according to  claim 1 , further comprising a hole formed between the cooling water supplier close to the trimming portion of the steel plate blank and a steel plate blank contacting surface. 
     
     
         5 . The press hardening die cooling device according to  claim 1 , wherein the press hardening die is provided with an insulator. 
     
     
         6 . The press hardening die cooling device according to  claim 2 , further comprising temperature sensors disposed between the trimming portion of the steel plate blank and the cooling water supplier to sense temperature of the press hardening die, and output sensed signals to the controller. 
     
     
         7 . The press hardening die cooling device according to  claim 1 , wherein the cooling water temperature adjuster configured to control temperature of the cooling water such that the trimming portion of the steel plate blank is changed into a mixed structure of ferrite, pearlite, and bainite. 
     
     
         8 . A press hardening die cooling device, comprising:
 a press hardening die including upper and lower die portions provided with insulators and configured to press a steel plate blank;   a plurality of cooling water suppliers spaced apart from each other in the upper and lower die portions to be channels through which cooling water flows; and   a cooling water temperature adjuster configured to adjust temperature of the cooling water supplied to the cooling water suppliers using temperature sensors disposed in the press hardening die.   
     
     
         9 . A press hardening die cooling device, comprising:
 a press hardening die and configured to press a steel plate blank;   a plurality of cooling water suppliers located in the press hardening die, spaced apart from each other, and configured to form channels through which cooling water flows; and   a cooling temperature adjuster configured to adjust the cooling rate of a trimming portion of the steel plate blank such that the trimming portion is cooled slower than other portion of the steel plate blank.   
     
     
         10 . A press hardening die cooling device of  claim 9 , wherein at least one of the plurality of cooling water suppliers close to the trimming portion has a size smaller than the size of another cooling water supplier. 
     
     
         11 . A press hardening die cooling device of  claim 9 , wherein a distance between at least one of the plurality of cooling water suppliers close to the trimming portion and a steel blank contact surface of the die is greater than a distance between another cooling water supplier and a steel blank contact surface of the die.