Cooling Die Reservoir Layout for Hot Press Surface Accuracy
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Solution Overview
Problem
In hot press forming, the provision of cooling grooves on the forming die set can transfer grooved shapes to the formed product, compromising surface accuracy, and the separate cooling area can lead to reduced cooling rates due to the lower die being at higher temperatures, affecting the strength of the final product.
Innovation Solution
A hot press device with a cooling die set that includes a lower die with a liquid reservoir for coolant retention, allowing direct cooling of the lower die and efficient cooling of the formed product, eliminating the need for cooling grooves on the forming die set.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling grooves are provided in the pressing surface of the forming die set, then the cooling rate of the formed product is improved, but the surface accuracy of the formed product deteriorates due to groove transfer
Solution Approach 1:
The patent divides the die set into two separate functional areas: a forming area with an opening for receiving the formed product, and a cooling area with cooling grooves. This segmentation allows the cooling function to be provided without transferring grooves to the formed product surface, as the cooling grooves are located in a separate area from the forming surface.
Solution Approach 2:
The patent introduces a support member as an intermediary component that supports the formed product during cooling. This support member is positioned in the cooling area and prevents direct contact between the formed product and the cooling grooves, thereby avoiding groove transfer while still enabling effective cooling through the liquid coolant system.
2Manufacturing precision
If a separate cooling area is provided, then the surface accuracy of the formed product is ensured, but the cooling rate decreases due to the lower die being at higher temperatures
Solution Approach 1:
The support member acts as an intermediary that enables the formed product to be cooled effectively in the cooling area without direct contact with cooling grooves. It facilitates heat transfer from the formed product to the liquid coolant while maintaining surface accuracy, and also supports the formed product on the pressing surface of the lower die.
Solution Approach 2:
The patent uses a liquid coolant system with supply and discharge nozzles to provide efficient cooling in the cooling area. The liquid coolant flows through the cooling grooves in the cooling area, absorbing heat from the formed product and the lower die, thereby maintaining a lower temperature in the lower die and ensuring high cooling rates despite the separate cooling area configuration.
3Productivity
If the lower die is repeatedly used for hot press forming, then productivity is improved, but the temperature of the lower die increases, reducing the cooling efficiency
Solution Approach 1:
The patent implements a continuous cooling system where liquid coolant continuously flows through the cooling grooves in the lower die during each forming cycle. This continuous cooling action removes heat from the lower die promptly, preventing temperature accumulation even during repeated forming operations, thereby maintaining consistent cooling efficiency and productivity.
Solution Approach 2:
The liquid coolant system with supply and discharge nozzles provides efficient heat removal from the lower die. The hydraulic flow of liquid coolant through the cooling grooves ensures continuous heat dissipation, allowing the lower die to maintain a lower temperature state during repeated use, thus preserving cooling efficiency and enabling sustained high 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 enhances the cooling rate of the formed product while maintaining surface accuracy and reduces the temperature increase of the lower die, ensuring the product is appropriately hardened.
Implementation Method 1
liquid coolant in a liquid reservoir provided in a lower cooling die is used to cool the lower cooling die
Implementation Method 2
a primary formed product that is obtained in a forming area and is in a high temperature state is held under pressure and cooled on respective pressure-holding surfaces of an upper die and a lower die
Data Source
AI summary
A hot press device (1) uses an upper pressure-holding surface (41a) and a lower pressure-holding surface (42a) of an upper cooling die (41) and a lower cooling die (42) in a cooling die set (40) to hold under pressure and cool a primary formed product (P) that is obtained in a forming area (3) and is in a high temperature state, so that a hardened vehicle frame (F) is obtained. The lower cooling die (42) includes a first liquid reservoir (44) for retaining liquid coolant.