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US 10,286,439 B2Granted
Hot stamping method
AssigneesMs Autotech Co., Ltd., Myungshin Industry Co., Ltd.
InventorsHong Kyo Jin, Jae Sin Yang, Jae Hyung Park, Tae Kyu Lee
Life of this patent
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Abstract
Provided is a method for manufacturing vehicle parts having ultra-high strength of 500 Mpa or more by using hot stamping. The method includes: forming a heated blank in a press forming apparatus; and taking out the formed blank from the press forming apparatus and consecutively cutting the blank with a trimming die. A blank temperature at the time of trimming may be 150° C. to 330° C.
Claims3
A hot stamping method comprising:
- (a) heating a blank to an austenitization temperature of the blank or more;
- (b) forming the heated blank in a press forming apparatus, wherein the forming of the blank is started at a temperature of 600° C. to 900° C. and the heated blank is cooled to below a martensite transformation start temperature (Ms) of the blank at a speed of 25° C./sec or more;
- and
- (c) taking out the formed blank from the press forming apparatus and consecutively cutting the formed blank with a trimming die, wherein a blank temperature at the time of cutting is 150° C. to 330° C.,
- wherein, in the step (c), the formed blank is taken out from the press forming apparatus at a temperature 250° C. to 350° C.;
- the formed blank is sequentially cut by using at least two trimming dies;
- the formed blank is not reheated during the entire process of trimming;
- and a final trimming is performed at 170° C. or higher.
5 more elements
Dependencies are inferred from the claim text.