Friction-Welded Rod Assembly With Radial Expansion Restraint
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Solution Overview
Problem
The existing methods for manufacturing rods lack the quality improvement needed to enhance the strength and precision of the welding connections, particularly in the friction pressure welding process, leading to potential deformation and reduced joint strength.
Innovation Solution
A method involving the use of a restraining member to prevent radial deformation during friction welding, combined with specific conical hole and outer peripheral surface designs, ensures precise alignment and enhanced strength by maintaining the shape integrity of the rod components during the welding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If friction pressure welding is performed on two members to manufacture a rod, then the rod can be manufactured with joining capability, but the welding connection may exhibit radial expansion and reduced joint strength
Solution Approach 1:
The restraining member is placed into the hollow first member before the friction pressure welding process begins. This preliminary action constrains the outer peripheral surface of the first member, preventing radial expansion during welding and ensuring dimensional stability of the welding joint.
Solution Approach 2:
The restraining member acts as an intermediary tool between the welding process and the first member. It mediates the welding process by providing external constraint to prevent radial expansion, allowing the welding to proceed with improved dimensional control and joint strength.
2Strength
If the outer peripheral surface of the first member is constrained during welding, then radial expansion is prevented and joint strength is improved, but the device complexity increases due to the restraining member
Solution Approach 1:
The restraining member provides localized constraint only at the outer peripheral surface of the first member where radial expansion occurs during welding. This local quality approach targets the specific problem area without requiring complex overall system modifications, maintaining simplicity while improving joint strength.
3Adaptability or versatility
If the hollow first member is used as the portion that slidably contacts the sliding contact member, then the rod achieves the required functional geometry, but the inner peripheral surface may deform during welding affecting precision
Solution Approach 1:
The restraining member provides counteracting force against the radial expansion forces generated during friction pressure welding. By applying this counter-constraint, the inner peripheral surface maintains its geometric precision despite the welding process, ensuring both functional geometry and manufacturing precision are achieved.
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 improves the manufacturing quality by preventing radial expansion and ensuring strong, precise welding connections, enhancing the structural integrity of the rod components.
Implementation Method 1
joining the first member and the second member by a welding connection with the aid of friction
Implementation Method 2
performing friction pressure welding on two members
Data Source
AI summary
A method for manufacturing a rod includes a step of preparing a hollow first member and a second member formed so as to have a portion smaller in outer diameter than an outer diameter of the first member, a restraining step of placing a restraining member into abutment with an outer peripheral surface of the first member, a step of moving an inner peripheral surface of the first member and an outer peripheral surface of the second member closer to each other while rotating at least one of the first member or the second member, and a step of joining the first member and the second member by welding with the aid of friction by axially pressing in the first member and the second member by a predetermined amount after placing the inner peripheral surface of the first member and the outer peripheral surface of the second member into contact.