Halved Sliding Bearing Burr Prevention via Chamfered Recess
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Solution Overview
Problem
The formation of burrs during the cutting process of halved sliding bearing mating surfaces, which can lead to reduced reliability due to the need for extensive trimming, is a challenge in ensuring high flatness and preventing deformation and interference issues.
Innovation Solution
A manufacturing method involving chamfering at least one edge segment of the recess's peripheral edge, where the cutting blade first reaches the chamfered edge, suppresses burr formation, and the chamfer angle is optimally between 30 and 65 degrees to balance mechanical stability and prevent burrs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the recess is formed on the mating surface first, then the recess positioning is improved, but burrs are formed during subsequent cutting of the mating surface
Solution Approach 1:
The recess is formed in advance on the unprocessed body before the mating surface cutting operation. This preliminary formation of the recess allows subsequent cutting to proceed without the hollow space interference that would otherwise cause burr formation, while maintaining proper recess positioning.
Solution Approach 2:
Instead of cutting the mating surface first and then forming the recess (which would cause burrs), the invention inverts the sequence by forming the recess first and then cutting the mating surface. This reverse sequencing eliminates the burr formation problem while achieving the desired flatness.
2Manufacturing precision
If the mating surface is cut in the finishing stage to secure flatness, then the flatness is improved, but deformation appears on the mating surface
Solution Approach 1:
The recess is formed in advance during the unprocessed body stage, before the final mating surface cutting. This preliminary action allows the mating surface to be cut in the finishing stage to achieve high flatness without the risk of deformation caused by subsequent recess formation operations.
3Reliability
If trimming is performed to remove burrs, then the reliability is improved, but man-hours increase
Solution Approach 1:
The invention converts the potential harm of burr formation into a benefit by using the recess formation process itself to prevent burrs. By forming the recess first with proper positioning, the subsequent mating surface cutting naturally avoids creating burrs, eliminating the need for separate trimming operations and improving productivity while maintaining reliability.
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 enhances productivity, reduces the need for trimming, and ensures high reliability by preventing burr formation, maintaining mechanical stability, and improving the flatness of the mating surface.
Implementation Method 1
forming the mating surface by cutting the circumferential end surface such that a cutting blade when at the recess position, firstly reaches said at least one chamfered edge segment
Implementation Method 2
at least one edge segment of the peripheral edge of the recess intersects with an axial direction of the member, and wherein the entirety of the at least one edge segment is chamfered; thereby suppressing formation of a burr
Data Source
Figure 1~2
Figure 3~4(B)
Figure 5(A)~6(B)
AI summary
A halved sliding bearing (1) has a recess (7) formed in a circumferential direction from an outer peripheral edge of a mating surface (5) of a semi-cylindrical bearing main body (3). To prevent formation of a burr to an inside of the recess (7) during formation of the mating surface (5), an entirety of at least one edge segment of a peripheral edge of the recess (7) opening on a circumferential end surface of a semi-cylindrical member (23) as an unprocessed body of the bearing main body (3), the at least one edge segment intersecting with an axial direction of the member (23), is chamfered. The mating surface is formed by cutting the circumferential end surface such that a cutting blade (31) firstly reaches the chamfered edge in the peripheral edge of the recess (7). Thus, the bearing main body is produced.