Hot Forming Tool with Integrated Separation and Cooling
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Solution Overview
Problem
Existing hot forming methods face challenges in coordinating the forming and separating operations of metal workpieces, particularly in maintaining the necessary cooling rates and hardness levels, which affects the accuracy and efficiency of the process.
Innovation Solution
A method and tool for hot forming that integrates forming and separation operations, allowing for precise control of cooling and structural conversion from austenitic to martensitic structure, enabling separation before complete structural conversion and using mechanical separating agents with low wear, and incorporating a Cu-Zr alloy for high heat strength and thermal conductivity in cutting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the workpiece is cooled quickly to achieve the desired hardness and martensitic structure, then the hardness and strength are improved, but the forming operation is adversely affected if the workpiece hardens too soon
Solution Approach 1:
The process is segmented into distinct stages: first the forming operation is completed while the workpiece is still soft and formable, then the cooling and hardening operation is initiated. This temporal segmentation allows both forming and hardening to be achieved without interference.
Solution Approach 2:
The forming operation is performed preliminarily before the hardening operation. The workpiece is formed in its soft austenitic state, and only after the forming is complete does the rapid cooling to induce martensitic transformation begin, ensuring the workpiece does not harden during forming.
2Manufacturing precision
If the workpiece is held in the forming tool until it has cooled to approximately 100°C to ensure final dimensions, then the dimensional accuracy is improved, but the production time increases
Solution Approach 1:
The separating operation is performed preliminarily during the cooling process at an intermediate temperature (e.g., 300-500°C) before the workpiece reaches its final cooling stage. This allows the separating operation to be completed while the workpiece is still warm and more formable, reducing the total time the workpiece must be held in the tool.
Solution Approach 2:
The temperature parameter is dynamically utilized: the separating operation is performed at an optimized intermediate temperature range during cooling, rather than waiting for complete cooling to 100°C. This parameter optimization balances dimensional stability with operational efficiency.
3Ease of operation
If mechanical separating agents are used during hot forming, then the separating operation can be performed, but wear on the separating agents increases due to high temperatures and material strength
Solution Approach 1:
The separating operation is performed preliminarily during the cooling process at an intermediate temperature (300-500°C) before the workpiece reaches its final low-temperature state. At this intermediate temperature, the workpiece material has reduced strength and increased ductility, significantly reducing wear on the mechanical separating agents while still allowing effective separation.
Solution Approach 2:
The temperature parameter is optimized for the separating operation by performing it at an intermediate temperature range (300-500°C) during the cooling process. This temperature optimization reduces the material strength and increases ductility, thereby reducing wear on separating agents while maintaining operational effectiveness.
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 achieves high production accuracy, reduces wear on mechanical separating agents, and allows for efficient separation and forming in a single integrated operation, maintaining the workpiece's geometry and achieving the desired hardness levels.
Implementation Method 1
the workpiece present in the forming tool is quenched in order to convert the austenitic structure to a martensitic structure, i.e., to harden the workpiece
Implementation Method 2
The forming tool has a cooling device by means of which the workpiece present in the forming tool is quenched
Data Source
AI summary
The invention relates to a hot forming tool for hot forming a metal workpiece, having at least two dies which may be moved relative to one another for forming the workpiece, and having a cooling device by means of which the workpiece may be cooled in the hot forming tool from a first, higher temperature to a second, lower temperature. To improve the hot forming tool, it is provided that the hot forming tool is equipped with a separating device by means of which a separating operation may be carried out on a workpiece present in the hot forming tool. The invention further relates to a method for hot forming.