Half Plain Bearing Positioning Member Forming Method
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Solution Overview
Problem
Existing methods for manufacturing half plain bearings face challenges in achieving optimal positioning functionality while minimizing material deformation and tool durability issues, leading to restricted design freedom and potential manufacturing inefficiencies.
Innovation Solution
A manufacturing method where the material of the bearing body is plastically deformed to wrap around a relatively thin tool, ensuring sufficient protrusion for positioning while reducing circumferential deformation, using a press tool with a narrow width and strategically angled faces to enhance tool durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protrusion amount of the positioning member is increased to improve positioning function, then the positioning performance is improved, but the deformation amount of the bearing body material increases adversely affecting performance
Solution Approach 1:
The patent changes the geometric parameters of the press tool, specifically using a narrow width and strategic angular orientations of faces, to control the plastic deformation process. This allows achieving the desired protrusion amount while minimizing adverse deformation of the bearing body material.
Solution Approach 2:
The press tool is designed with curved surfaces that match the cylindrical geometry of the bearing body. The tool faces are angled and curved to distribute deformation forces evenly, preventing localized excessive deformation while achieving the required positioning member protrusion.
2Reliability
If the protrusion amount of the positioning member is increased to improve positioning function, then the positioning performance is improved, but the stress applied to the tool increases causing reduced durability
Solution Approach 1:
The patent optimizes the press tool's geometric parameters including narrow width and specific angular orientations of its faces. These parameter changes reduce the stress concentration on the tool during the forming process, thereby improving tool durability while still achieving the required positioning member protrusion.
Solution Approach 2:
The curved surfaces of the press tool are designed to match the bearing body geometry, distributing the applied stress evenly across the tool-furing interface. This reduces peak stresses and prevents premature tool failure, extending tool life.
3Duration of action of stationary object
If a wide tool is used to form the positioning member, then the tool durability decreases due to increased stress, but the manufacturing process is simpler
Solution Approach 1:
The patent employs a press tool with specific geometric parameters including narrow width and precisely angled faces. While the design is more complex than a simple wide tool, these parameter optimizations significantly reduce stress on the tool, improving durability and justifying the increased design complexity.
4Manufacturing precision
If the material deformation is reduced to maintain bearing body performance, then the positioning member protrusion amount is limited, but the bearing body performance is maintained
Solution Approach 1:
The patent uses a press tool with optimized geometric parameters including narrow width and specific angular orientations. These parameter changes enable selective deformation: sufficient protrusion is achieved in the positioning member region while overall bearing body deformation is minimized, maintaining both positioning function and bearing performance.
Solution Approach 2:
The press tool is designed to create localized deformation at the positioning member formation zone. The narrow width and angled faces concentrate the forming action locally, achieving the required protrusion without causing excessive deformation in other critical areas of the bearing body.
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 ensures reliable positioning, improved fatigue properties, and allows for a smaller fitting groove size, reducing manufacturing costs and increasing the rigidity of the bearing housing while maintaining the performance of the half plain bearing.
Implementation Method 1
the material of the bearing body is plastically deformed so as to wrap around a press tool (33)
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A half plain bearing that has a positioning member with a novel construction, and a manufacturing method of the half plain bearing are proposed. If part of a material from which a bearing body 13 is formed is allowed to escape to outside of a tool with a narrow width when pressed by the tool, an amount of protrusion needed for a positioning member 20 to perform a function thereof (an amount of protrusion from an outer peripheral face of the bearing body) can be ensured while suppressing an amount of deformation of the material from which the bearing body 13 is formed in a circumferential direction thereof. The positioning member 20 of the half plain bearing thus formed has a flat portion 21a and a protrusion portion 22. A tip of the protrusion portion 22 is located on a mating face side with respect to a virtual plane that includes the flat portion 21a.