Bearing Ring Inversion Working with Sliding-Controlled Forming
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Solution Overview
Problem
Existing methods for manufacturing bearing ring members face challenges in performing inversion working due to issues such as small thickness, large diameter, or the presence of flange portions in the workpiece, leading to difficulties in deformation and unintended bending.
Innovation Solution
A method involving two distinct deformation steps using different dies and punches, where the first step occurs without sliding and the second step allows for controlled sliding, ensuring the workpiece is satisfactorily inverted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If inversion working is performed on workpieces with small thickness, large diameter, or flange portions using conventional single-step methods, then the manufacturing process is simple, but the inversion working cannot be satisfactorily performed leading to unintended deformation
Solution Approach 1:
The inversion working process is divided into two distinct steps: a first deformation step and a second deformation step. Each step uses different deformation conditions (sliding vs. non-sliding) to address specific aspects of the workpiece transformation, thereby achieving satisfactory inversion working for complex geometries without excessive overall process complexity
Solution Approach 2:
The patent dynamically adjusts the deformation mode by switching between sliding and non-sliding conditions between the two steps. The first step uses non-sliding deformation to achieve initial shaping, while the second step employs sliding deformation to complete the inversion, allowing the process to adapt to the changing geometric requirements during inversion working
2Productivity
If single-step inversion working is used, then the manufacturing process is efficient, but unintended deformation such as bending occurs
Solution Approach 1:
By segmenting the inversion process into two controlled steps with different deformation mechanisms, the patent prevents the unintended bending and deformation that occurs in single-step methods, while maintaining reasonable productivity through the systematic division of the deformation process
Solution Approach 2:
The first deformation step performs preliminary shaping of the workpiece under non-sliding conditions, preparing the workpiece geometry for the second step. This preliminary action reduces the deformation burden on the second step and prevents excessive stress that would cause bending and unintended deformation
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
The method enables successful inversion working of workpieces with complex shapes by minimizing bending moments and preventing unintended deformation, achieving a satisfactory manufacturing process.
Implementation Method 1
deforming the workpiece such that the workpiece body portion has a cylindrical shape
Implementation Method 2
in a state where no sliding occurs between the workpiece and the die
Data Source
AI summary
A method for manufacturing a bearing ring member includes an inversion step of sandwiching a workpiece including a workpiece body portion having an annular shape between a punch disposed on a first side in an axial direction and a die disposed on a second side opposite to the first side, and deforming the workpiece such that the workpiece body portion has a cylindrical shape. The inversion step includes, in the following order, a first step of deforming the workpiece using the punch and the die in a state where no sliding occurs between the workpiece and the die, and a second step of deforming the workpiece using the punch and the die in a state where a sliding occurs between the workpiece and the die.