Hot-Stamped Part Piercing Timing for Sheared Surface Quality
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Solution Overview
Problem
Existing hot-stamping processes face challenges with laser equipment, which have not effectively addressed issues such as increased processing time and deteriorated quality of sheared surfaces, and the need for flexible process design and quality control in hot-stamped parts manufacturing.
Innovation Solution
A method for manufacturing hot-stamped parts 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 forming 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 blank is heated to high temperature before piercing operation. This preliminary heating action softens the material, enabling subsequent piercing to be performed quickly with press dies without increasing processing time, while maintaining good sheared surface quality
Solution Approach 2:
The temperature of the blank is changed from room temperature to high temperature (Ac3 transformation point or higher) before piercing. This parameter change enables the use of press dies for piercing instead of laser equipment, resolving the contradiction between piercing capability and processing time
2Loss of time
If press dies are used for piercing, then processing time is reduced, but quality of sheared surfaces deteriorates
Solution Approach 1:
The temperature of the blank is raised to Ac3 transformation point or higher before piercing. This parameter change softens the material, allowing press dies to produce high-quality sheared surfaces without deterioration, while maintaining short processing time
Solution Approach 2:
Heating the blank to high temperature is performed as a preliminary action before piercing. This prepares the material in advance to be more suitable for press die piercing, ensuring both quick processing and high surface quality
3Device complexity
If hot piercing is performed without considering delay time, then process is simple, but quality control becomes difficult
Solution Approach 1:
The patent establishes feedback control by measuring the actual temperature of the blank and comparing it with the target temperature range. Based on this comparison, the piercing timing is adjusted to ensure optimal quality while maintaining relatively simple process implementation
Solution Approach 2:
The piercing operation timing is made dynamic rather than fixed. The delay time from press die bottom dead center is adjusted based on actual blank temperature and thickness, enabling quality control while keeping the process adaptable rather than overly complex
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 facilitates quality control of hot-stamped parts by optimizing the hot piercing delay time, improving the quality and efficiency of the manufacturing process.
Implementation Method 1
a heating operation of heating a blank
Implementation Method 2
a soaking operation in which the blank may be heated to a temperature of Ac3 to 1000 °C
Implementation Method 3
the heated blank may be air cooled at room temperature
Implementation Method 4
in the forming and piercing operation, the transferred blank may be cooled in the press die
Data Source
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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.