Bearing Ring Press Forming With Fewer Cutting Steps
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Solution Overview
Problem
The existing methods for manufacturing bearing elements such as outer and inner races of radial rolling bearings are costly and require a large number of processing steps, with significant cutting and grinding needed in post-treatment.
Innovation Solution
A bearing element manufacturing method that involves preparing a first piece with predetermined ring portions, processing it to obtain a second piece with corresponding ring portions, and then separating these into independent ring elements. This method uses a set of processing tools to deform the piece in an axial direction, reducing the need for extensive cutting and grinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional press working methods are used to manufacture bearing elements, then the manufacturing cost is high and the number of processing steps is large, but the manufacturing precision and productivity can be maintained
Solution Approach 1:
The patent combines multiple processing steps (cold upsetting, front extruding, and rear extruding) into a single integrated press working operation. The press working device simultaneously performs all these operations on the columnar billet to directly produce the finished bearing elements (outer race and inner race), eliminating the need for separate processing steps and reducing the overall number of operations required in conventional methods
Solution Approach 2:
The patent segments the bearing element into two distinct parts (outer race and inner race) that are formed simultaneously from a single columnar billet. The press working device creates both races with different diameter dimensions in one operation, allowing them to be separated afterward. This segmentation approach enables both elements to be produced efficiently without requiring separate manufacturing processes for each component
2Ease of manufacture
If conventional press working methods are used to manufacture bearing elements, then the manufacturing cost is high, but the manufacturing precision can be maintained
Solution Approach 1:
The patent performs preliminary shaping of the columnar billet through cold upsetting and front extruding to create an intermediate form that facilitates the subsequent rear extruding process. This preliminary action prepares the material structure and geometry in advance, enabling the final precise dimensional formation of both bearing elements to be achieved more easily and cost-effectively while maintaining required manufacturing precision
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 allows for the cost-effective manufacturing of bearing elements with reduced processing steps and minimized cutting and grinding, resulting in lower production costs and improved efficiency.
Implementation Method 1
a columnar billet (material) 5 shown in part (A) of FIG. 32 is subjected to cold upsetting and front extruding processes by a first press working device 6
Implementation Method 2
The floating die 6c includes a stepped cylindrical inner peripheral surface and receives an upward elastic force by the elastic member 6d
Data Source
AI summary
A first piece (13) includes a first ring portion (13b) and a second ring portion (13c) which are arranged side by side in an axial direction and an inner diameter and an outer diameter of the first ring portion (13b) are respectively larger than an inner diameter and an outer diameter of the second ring portion (13c). A second piece (16) is obtained by pressing the first piece (13) while the first piece (13) is disposed between a first set and a second set.