Step-Shaped Plunger Cooling Aluminum Wheel Spoke Roots
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Solution Overview
Problem
The hot spot at the root of an aluminum wheel spoke in low-pressure cast wheel molds hinders production efficiency and spoke performance due to prolonged cooling times, as existing methods weaken cooling in other areas to ensure solidification of this hot spot.
Innovation Solution
A plunger with a step-shaped main body, blind hole, vent holes, annular groove, air outlet pipes, and fitting surfaces is designed to enhance cooling by utilizing direct and indirect heat transfer, where cooling air is distributed through air outlet pipes and vent holes to forcibly cool the hot spot while allowing indirect heat transfer to other parts, reducing thermal contact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If production time is prolonged to ensure solidification of the hot spot at the spoke root, then the hot spot cooling is improved, but the production efficiency deteriorates
Solution Approach 1:
The invention applies local quality by providing specialized cooling structures (cooling channels and cooling plates) specifically at the spoke root hot spot area, while other parts of the mold use conventional cooling. This localized intensive cooling enables the hot spot to solidify faster without requiring prolonged overall production time, thus resolving the contradiction between hot spot cooling effectiveness and production efficiency
Solution Approach 2:
The invention changes the cooling parameter (cooling intensity) locally at the hot spot area by introducing dedicated cooling channels and cooling plates with optimized dimensions and arrangements. This parameter change allows selective enhancement of cooling at the critical hot spot region, enabling faster solidification without compromising overall production cycle time
2Strength
If production time is prolonged to ensure solidification of the hot spot at the spoke root, then the spoke performance is improved, but the production efficiency deteriorates
Solution Approach 1:
The invention ensures proper solidification of the spoke root (critical for spoke performance) through localized intensive cooling, while maintaining normal cooling rates for other parts. This selective cooling approach achieves the required spoke strength without requiring prolonged overall production time
Solution Approach 2:
The cooling channels and cooling plates are pre-configured in the mold design to target the hot spot area from the beginning of the casting process. This preliminary arrangement of cooling structures ensures that the spoke root solidifies at the appropriate rate from the start, eliminating the need for extended production time to achieve proper spoke performance
3Ease of manufacture
If conventional cooling is used for the hot spot area, then the manufacturing simplicity is maintained, but the thermal contact resistance increases
Solution Approach 1:
The invention introduces cooling plates as intermediary components between the cooling channels and the mold cavity wall at the hot spot area. These cooling plates improve thermal contact and heat transfer efficiency, acting as a mediator that enhances cooling effectiveness while maintaining manufacturing simplicity through modular design and standard fabrication processes
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 solution effectively reduces the negative influence of the hot spot by directly cooling the spoke root and indirectly cooling other parts, thereby improving production efficiency and spoke performance by optimizing heat transfer.
Implementation Method 1
cooling air is distributed through air outlet pipes and vent holes to forcibly cool the hot spot
Implementation Method 2
other parts are configured to indirectly transfer heat by using the thermal contact resistance
Data Source
AI summary
A plunger for strengthening spoke root R angle cooling. A plunger main body is step-shaped and provided with a blind hole, and vent holes are uniformly distributed around the blind hole; an annular groove is formed in the plunger main body, and connects the blind hole with the vent holes; air outlet pipes are inserted into the blind hole, the distance between the air outlet pipes and the bottom of the blind hole is 1-1.5 times the radius of the blind hole, an annular air pipe connects the air inlet pipe with the air outlet pipes and distributes cooling air entering from an air inlet pipe to each air outlet pipe, and the diameter of the air inlet pipe is not smaller than two times that of the air outlet pipe.