Method For Trimming A Hot Formed Part
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United States of America Patent
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Oct 21, 2014
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Oct 21, 2013
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Abstract
A method for manufacturing a hot formed part (20), such an automotive body component, is provided. The method includes heating a steel blank (22) to an austenite temperature, and quickly transferring the heated blank (22) to a hot forming apparatus (28). The method then includes forming the heated blank (22) between a pair of dies (24, 26), and trimming, piercing, shearing, or otherwise cutting the heated blank (22) or hot formed part (20) in the hot forming apparatus (28). The cutting step occurs while the microstructure of the steel blank (22) is substantially austenite, for example at a temperature of 400° C. to 850° C. The method can provide a hot formed part (20) having a desired shape in a single die stroke, without the need for a costly post-forming operation outside of the hot forming apparatus (28), such as laser trimming.
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