Quenching Tooling for Non-Uniform Workpiece Cooling
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Solution Overview
Problem
In metal workpiece processing, uneven cooling rates during quenching lead to warpage, residual stresses, and inconsistent material properties, resulting in increased manufacturing time and costs due to the need for reworking or scrapping of parts.
Innovation Solution
A method and apparatus where a workpiece with non-uniform thickness is placed between platforms with adjustable elements that control cooling rates by applying different temperatures to various sections, ensuring consistent cooling and desired properties across the workpiece before quenching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If uniform quenching is applied to workpieces with non-uniform thickness, then quenching speed is maintained, but warpage and residual stresses occur due to uneven cooling rates
Solution Approach 1:
The patent applies local quality by providing different cooling conditions to different sections of the workpiece. Specifically, thicker sections receive intensified cooling (through additional nozzles or higher flow rates) while thinner sections receive reduced cooling, ensuring uniform cooling rates across the entire workpiece and preventing warpage and residual stresses.
Solution Approach 2:
The patent employs dynamic adjustment of cooling parameters based on workpiece geometry. The cooling system dynamically modifies flow rates and nozzle positioning according to the local thickness requirements, allowing the quenching process to adapt to varying section dimensions and achieve uniform cooling throughout the workpiece.
2Speed
If rapid quenching is applied to achieve desired material properties, then cooling rate is increased, but uneven cooling causes warpage and residual stresses
Solution Approach 1:
The system applies local quality by differentiating cooling intensity across various sections of the workpiece. Thicker sections that require faster cooling to achieve desired material properties receive enhanced cooling, while thinner sections receive proportionally reduced cooling, maintaining internal stress uniformity throughout the workpiece.
Solution Approach 2:
The patent implements preliminary action by pre-positioning nozzles and pre-setting flow rates based on the workpiece geometry before quenching begins. This preliminary configuration ensures that each section receives the appropriate cooling intensity from the start, preventing thermal gradients that would lead to warpage and residual stresses.
3Device complexity
If conventional quenching methods are used, then process simplicity is maintained, but reworking and scrapping increase due to geometric variations
Solution Approach 1:
The patent applies segmentation by dividing the cooling system into multiple independently controllable zones with separate nozzles for different sections of the workpiece. This segmentation allows precise control of cooling rates in thick versus thin sections, eliminating geometric variations that would require reworking or scrapping, thereby improving manufacturing efficiency.
Solution Approach 2:
The system implements parameter changes by varying cooling parameters (flow rate, temperature, nozzle distance) according to local workpiece geometry. This parameter differentiation ensures uniform cooling across sections of varying thickness, preventing defects that would lead to rework or scrap and improving overall 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
This approach reduces warpage, residual stresses, and achieves consistent material properties, thereby decreasing manufacturing time and costs by ensuring precise control over the cooling process.
Implementation Method 1
A cooling rate of a second section of the workpiece may be controlled while maintaining the first temperature of the first section
Implementation Method 2
The workpiece may be quenched after cooling the second section of the workpiece to form a quenched workpiece
Data Source
AI summary
Methods for processing workpieces. A first temperature of a first section of a workpiece having a non-uniform thickness may be maintained. A cooling rate of a second section of the workpiece may be controlled while maintaining the first temperature of the first section. The workpiece may be quenched after cooling the second section of the workpiece to form a quenched workpiece, in which the cooling rate may be controlled such that the second section of the workpiece has desired properties.