Hot Stamping Size Correction Apparatus for Quenched Component Flatness
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Solution Overview
Problem
Hot stamping components with heterogeneous strengths face challenges in size distribution due to residual stress and thermal transformation, leading to defects like twisting and poor inter-door step quality, especially in vehicle components like center pillars, where different sections require varying tensile strengths.
Innovation Solution
An apparatus and method for size correction in hot stamping components, featuring a jig frame with attaching, clamping, measurement, and correction units, which measure and adjust the height sizes of quenched components to align with a predetermined zero base, applying forces to correct deviations and minimize size distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If local quenching hot stamping is used to increase collision energy absorption, then strength is improved, but size distribution deviation occurs due to residual stress and thermal transformation
Solution Approach 1:
The patent applies preliminary counter-action by designing the mold temperature distribution and quenching parameters in advance to compensate for expected thermal transformation and residual stress effects. The mold temperature is controlled to be higher in regions prone to excessive quenching, preventing size deviation before it occurs.
Solution Approach 2:
The patent changes physical parameters by controlling mold temperature distribution (higher temperature in specific regions), cooling rates, and quenching conditions to suppress martensite transformation in critical areas, thereby reducing size distribution deviation while maintaining overall strength.
2Strength
If heterogeneous materials with different strengths are used in different sections, then component strength requirements are met, but manufacturing cost increases due to welding process
Solution Approach 1:
The patent applies local quality by creating heterogeneous strength distribution within a single homogeneous material through controlled local quenching. Different sections of the same steel plate achieve different strength levels (e.g., 1500 MPa in upper portion, 860-1000 MPa in lower portion) through differential cooling rates, eliminating the need for welding separate materials.
Solution Approach 2:
The patent uses homogeneous material (single steel plate with uniform composition) throughout the component, avoiding the need to join heterogeneous materials. The material homogeneity simplifies manufacturing by eliminating welding processes while the achieved strength heterogeneity meets different sectional requirements.
3Stability of the object's composition
If quenched component is extruded at high temperature (420°C or greater), then ductility is improved, but twisting occurs due to residual stress and thermal transformation
Solution Approach 1:
The patent changes temperature parameters by controlling the extrusion temperature to be 420°C or greater, which suppresses martensite transformation and reduces residual stress during forming. This temperature control prevents twisting deformation while maintaining ductility, and subsequent controlled cooling achieves the desired strength distribution without excessive distortion.
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
The solution effectively reduces size distribution in hot stamping components, enhancing the flatness of door hinge surfaces and reducing defect rates, thereby improving the quality and cost-effectiveness of vehicle body components.
Implementation Method 1
a process that heats a steel plate containing boron at an austenitizing temperature (900 to 950° C.) and molds the steel plate with a press and cools the steel plate
Implementation Method 2
Since enhancement of the strength of the hot stamping component is caused by martensite transformation
Implementation Method 3
a local quenching hot stamping component has been manufactured to increase absorption of collision energy. Since enhancement of the strength of the hot stamping component is caused by martensite transformation, when a cooling speed decreases by partially increasing a temperature of a mold or a component requiring ductility is hot-stamped while heating the material, the martensite transformation is suppressed and quenched
Implementation Method 4
twisting may occur, which causes the quenched component to excessively deviate from a requirement degree due to residual stress and thermal transformation caused due to a temperature difference between the quenched component and a martensite transformation portion
Data Source
AI summary
An apparatus of size correction for a hot stamping component is provided. The apparatus includes a jig frame and a plurality of attaching units disposed on the jig frame to rotate in an anteroposterior direction and support a hot stamping component including a quenched component which is partially quenched along the jig frame in the anteroposterior direction. A plurality of clamping units disposed on the jig frame and configured to clamp the hot stamping component. A plurality of measurement units mounted on the jig frame and measure a height of the quenched component based on a predetermined zero base. A plurality of correction units are mounted in front of the jig frame corresponding to the quenched component of the hot stamping component. A force is applied to the quenched component in a vertical direction based on the height size, measured by the measurement unit to adjust the height.