Hot Stamping Component Cooling Timing for Tensile Strength Control
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Solution Overview
Problem
Existing hot stamping processes lack effective control over heating time, air cooling time, and mold cooling time, which affects the quality and consistency of manufactured components, particularly in terms of tensile strength and structural integrity.
Innovation Solution
A method for manufacturing hot stamping components that involves controlling heating, air cooling, and mold cooling times using specific equations and parameters such as material type, thickness, and temperature, including step-heating and soaking stages, to achieve optimal phase transformation and microstructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hot stamping processes are used without controlled cooling time parameters, then the manufacturing process is simple, but the quality and consistency of components (tensile strength) deteriorates
Solution Approach 1:
The patent applies parameter changes by establishing specific mathematical relationships for cooling time based on material thickness and temperature. Equation 1 calculates air cooling time using material thickness (t) and heating temperature (Tt) with correction coefficients, while Equation 3 calculates mold cooling time using similar parameters. This transforms the qualitative concept of 'adequate cooling' into quantitative, controllable parameters, resolving the contradiction between quality consistency and process simplicity.
Solution Approach 2:
The patent implements feedback control by using the established equations to continuously adjust cooling time parameters based on actual material thickness and temperature measurements. The correction coefficients (at, bt, ct for air cooling; aq, bq, cq for mold cooling) provide feedback mechanisms that adapt the process parameters to specific material conditions, ensuring consistent component quality while maintaining manageable process complexity through systematic control.
2Productivity
If heating time is insufficient, then productivity increases, but phase transformation and microstructure development are inadequate
Solution Approach 1:
The patent resolves this contradiction by establishing quantitative parameter relationships that define the minimum heating time required for complete phase transformation. The equations incorporate material thickness (t) and heating temperature (Tn) with correction coefficients (an, bn, cn) to calculate optimal heating duration. This ensures that heating time is neither insufficient (compromising quality) nor excessive (reducing productivity), but precisely optimized for each specific material and temperature condition.
3Strength
If air cooling time is not controlled, then the process is simpler, but tensile strength and structural integrity of components deteriorate
Solution Approach 1:
The patent applies parameter changes by using Equation 1 to calculate optimal air cooling time based on material thickness (t) and heating temperature (Tt). The equation incorporates correction coefficients (at, bt, ct) that account for specific material properties and thermal conditions. This quantitative approach ensures adequate tensile strength and structural integrity by preventing premature cooling that would cause incomplete phase transformation, while avoiding excessive cooling that would reduce productivity.
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
Improves the quality and consistency of hot stamping components by ensuring adequate phase transformation and microstructure development, resulting in components with tensile strengths ranging from 1350 MPa to 2300 MPa.
Implementation Method 1
a heating process is a process of heating a blank in a heating furnace
Implementation Method 2
may utilize a phase transformation and microstructure change of a material during the process
Implementation Method 3
the blank heated through the heating process may be exposed to room temperature and air-cooled while being inserted into the mold
Implementation Method 4
a cooling process is a process of cooling a hot-stamped molded body in a mold
Implementation Method 5
cooling the formed molded body
Data Source
AI summary
The present disclosure provides a method of manufacturing a hot stamping component, the method includes inserting a blank into a heating furnace, heating the blank, and transferring the heated blank from the heating furnace to a mold, wherein an air cooling time of the blank in the transferring of the blank satisfies Equation 1.