Hot-Stamped Part Piercing Delay Control for Sheared Surface Quality
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Solution Overview
Problem
The existing methods for manufacturing hot-stamped parts face challenges such as increased processing time with laser equipment and deteriorated sheared surfaces when using press dies, necessitating a more efficient and quality-controlled process.
Innovation Solution
A method is developed that includes a heating operation, transferring operation, and forming/piercing operation, with a derived maximum delay time for hot piercing based on factors like blank thickness and start temperature, using a correction coefficient equation to optimize the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If laser equipment is used for piercing, then piercing can be performed, but processing time increases
Solution Approach 1:
The patent combines the forming operation and piercing operation into a single integrated process step. The press die performs both functions simultaneously during the hot stamping process, eliminating the need for separate laser piercing operations and reducing total processing time.
Solution Approach 2:
The piercing operation is performed continuously during the forming process without interruption. The press die maintains contact with the workpiece throughout both forming and piercing operations, ensuring continuous useful action and maximizing productivity.
2Productivity
If press dies are used for piercing, then processing time is reduced, but the quality of sheared surfaces deteriorates
Solution Approach 1:
The patent changes the temperature parameter by performing piercing at elevated temperatures during hot stamping. This temperature change modifies the material properties, allowing press die piercing to achieve both high productivity and good surface quality that would not be possible at room temperature.
Solution Approach 2:
The workpiece is in an austenitic phase at high temperature during piercing, which provides improved ductility and surface quality. The phase transition from austenite to martensite occurs during subsequent cooling, locking in the high-quality surface structure achieved during hot piercing.
3Adaptability or versatility
If hot piercing delay time is not optimized, then process flexibility is reduced, but quality control becomes difficult
Solution Approach 1:
The patent introduces a dynamic delay time parameter that can be adjusted based on specific process requirements. This allows the hot piercing operation to be timed optimally after forming, providing process flexibility while maintaining quality control through controlled timing variations.
Solution Approach 2:
The forming operation is completed first as a preliminary action before piercing is performed. This sequence ensures the workpiece is properly shaped and positioned before the piercing operation begins, facilitating both process flexibility and quality control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables flexible process design and improves the quality control of manufactured hot-stamped parts by considering various factors, ensuring optimal timing for hot piercing and forming.
Implementation Method 1
a heating operation of heating a blank; a soaking operation in which the blank may be heated to a temperature of Ac3 to 1000° C.
Implementation Method 2
steel sheets are heated to a high temperature in a heating furnace and then rapidly cooled while being formed in a press
Data Source
AI summary
The present disclosure provides a method of manufacturing hot-stamped parts, the method including: a heating operation of heating a blank; a transferring operation of transferring the heated blank to a press die including a punch; and a forming and piercing operation of hot-forming the transferred blank into a shape of a hot-stamped part and hot-piercing the transferred blank to form a pierced portion in the hot-stamped part.