Cycloid Pocket Machining for High-Precision Solid Components
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Solution Overview
Problem
Existing manufacturing methods for solid components, such as solid cages for rolling element bearings, face challenges in achieving high precision and surface quality due to limitations in cutting techniques and tool configurations, often requiring additional finishing steps.
Innovation Solution
A manufacturing device employing a cycloid machining method with a chisel and tool cutting lip, guided along cycloid paths, to create pockets with precise geometry and surface finish, eliminating the need for further machining steps by controlling the rake angle and clearance angle of the tool cutting lip, and utilizing a control device to rotate the component and tool in coordinated directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cutting methods are used to manufacture solid components, then the manufacturing process is simple, but the manufacturing precision and surface quality are insufficient
Solution Approach 1:
The patent employs dynamic cycloid motion of the tool cutting lip relative to the rotating component blank. The tool follows a cycloid path generated by the coordinated rotation of the component about its axis and the tool about its own axis, transforming static cutting into dynamic precision machining. This dynamic approach enables high manufacturing precision without requiring overly complex device architecture.
Solution Approach 2:
The cycloid path of the tool cutting lip introduces curved, non-linear motion trajectories instead of straight or circular paths. This curved motion pattern enables precise control over the tool's engagement with the workpiece, achieving accurate pocket geometry and surface quality while maintaining reasonable device complexity through mathematical trajectory control.
2Manufacturing precision
If multiple machining steps including finishing steps are used, then the manufacturing precision is improved, but the productivity is reduced
Solution Approach 1:
The cycloid machining process performs preliminary shaping and finishing operations in a single integrated step. The tool cutting lip, with specifically designed rake and clearance angles, removes material in a controlled manner that simultaneously achieves the required shape and surface quality, eliminating the need for separate finishing operations and thereby maintaining high productivity.
Solution Approach 2:
The patent optimizes the rake angle and clearance angle parameters of the tool cutting lip to enable single-step machining that achieves both high precision and good surface quality. By carefully selecting these geometric parameters, the process eliminates the need for multiple machining steps with different tool configurations, thus improving productivity while maintaining manufacturing precision.
3Manufacturing precision
If additional finishing steps are required, then the surface quality is improved, but the manufacturing time is increased
Solution Approach 1:
The tool cutting lip is designed with optimized rake angles (positive or negative) and clearance angles specifically tailored for the cycloid motion pattern. These parameter changes enable the tool to produce high-quality surface finishes during the primary machining operation itself, eliminating the need for additional finishing steps and reducing total manufacturing cycle time.
4Manufacturing precision
If conventional cutting tools are used, then the device complexity is low, but the manufacturing precision and surface quality are insufficient
Solution Approach 1:
Instead of using complex multi-axis CNC tools, the patent employs a relatively simple tool cutting lip that achieves high precision through dynamic cycloid motion. The tool rotates about its own axis while the component rotates about its axis, generating the precise cycloid trajectory mathematically rather than through complex mechanical tool paths, thus maintaining low device complexity while achieving high manufacturing precision.
Data Source
AI summary
A method of manufacturing, comprising utilizing at least one cycloid machine to machine a component blank, wherein the component blank includes a plurality of pockets, guiding a tool cutting lip of a chisel along a cycloid path relative to the component blank rotating about a component rotation axis in a component direction of rotation, rotating the chisel about a tool rotating axis, wherein the tool rotating axis is arranged offset to the component rotating axis, machining the plurality of pockets, wherein a radial vector to a tool rotation axis that extends through a cutting edge of the tool cutting lip, and dividing the tool cutting lip into a clearance angle portion and into a rake angle portion, wherein the clearance angle portion is configured to be at least twice as large as the rake angle portion of the chisel.