Friction Stir Liquid Cooling Jacket Joining
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Solution Overview
Problem
Conventional friction stir joining methods face challenges in positioning metal members relative to each other and in reducing the load exerted on the friction stirring device, particularly in manufacturing liquid cooling jackets, where precise alignment and reduced load are necessary for effective sealing and strength.
Innovation Solution
The method involves abutting a first metal member with projecting parts on a second metal member having corresponding holes, allowing only the stirring pin of the rotary tool to contact the members during friction stirring, thereby facilitating easy positioning and reducing the load on the device. This approach enhances air-tightness and joining strength by forming multiple abutment points and using a rotary tool with a spiral groove to manage plasticized material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the end face of the first metal member is inserted into the recess of the second metal member for friction stir joining, then the joining process can be performed, but it becomes difficult to position the metal members relative to each other
Solution Approach 1:
The hole is formed in advance in the second metal member before the friction stir joining process. This preliminary action enables easy positioning by allowing the projecting part of the first metal member to be inserted into the pre-formed hole, thereby solving the positioning difficulty while maintaining the joining process
2Ease of manufacture
If friction stirring is performed with the shoulder portion of the rotary tool being in contact with the front surface of the second metal member, then the joining can be performed, but a large load is exerted on the friction stirring device
Solution Approach 1:
The shoulder portion is removed from the rotary tool, leaving only the stirring pin. This extraction eliminates the source of excessive load (the shoulder portion contacting the metal member surface) while preserving the essential joining function through the stirring pin alone, thereby reducing the load on the friction stirring device
3Ease of manufacture
If the sealing body is disposed on the jacket body to form an overlapped portion for friction stir joining, then the liquid cooling jacket can be manufactured, but it becomes difficult to position the sealing body relative to the jacket body
Solution Approach 1:
The hole is formed in advance in the sealing body before assembly. This preliminary action enables precise positioning during assembly by allowing the projecting part of the support part to be inserted into the pre-formed hole, thereby solving the positioning difficulty in manufacturing the liquid cooling jacket
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 method simplifies the positioning of metal members, reduces the load on the friction stirring device, and enhances the air-tightness and strength of the liquid cooling jacket by ensuring precise contact and efficient plasticization management during the friction stirring process.
Implementation Method 1
join the abutment portion by friction stirring
Implementation Method 2
using a rotary tool with a spiral groove to manage plasticized material
Data Source
AI summary
A joining method includes abutting an end face of a first metal member in a plate shape having a projecting part on the end face on a rear face of a second metal member in a plate shape having a hole that is bored through the second metal member in a plate thickness direction and simultaneously inserting the projecting part into the hole. The method includes inserting a stirring pin of a rotary tool into an abutment portion of a wall of the hole and an outer peripheral surface of the projecting part from a front face side opposite to the rear face of the second metal member. The rotary tool is moved along the abutment portion to join the abutment portion by friction stirring. The abutment portion is joined together with only the stirring pin of the rotary tool being in contact with the first and second metal members.