Center Shaft Machining Eccentric Support
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Solution Overview
Problem
Heat treatment of shaft workpieces can cause distortion, leading to products that are out of tolerance, and existing methods to correct distortion may result in cracks or chaps, especially for hollow shafts.
Innovation Solution
A center shaft machining apparatus with a grinding structure that rotates on the machining central axis, an end portion support structure with an eccentric mechanism to support the workpiece eccentrically, and a shaft portion support structure to center the shaft support portion, allowing for precise machining of the center hole without generating cracks or chaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat treatment is performed on shaft workpiece to increase strength, then strength is improved, but distortion occurs and product is out of tolerance
Solution Approach 1:
The patent applies preliminary action by performing center hole machining with high precision before heat treatment. The center hole is machined to precise dimensions and then preserved during heat treatment through protective measures, ensuring that the critical dimensional accuracy is established before the distortion-prone heat treatment process occurs.
Solution Approach 2:
The patent segments the manufacturing process into distinct stages: precise center hole machining before heat treatment, and distortion correction after heat treatment. This segmentation allows each process to be optimized independently, with the center hole precision established in the first stage and distortion addressed in the second stage.
2Manufacturing precision
If repeated pressing is applied to correct distortion, then distortion is eliminated, but crack or chap is generated in hollow shaft workpiece
Solution Approach 1:
The patent applies local quality by selectively correcting only the distorted portions of the shaft workpiece rather than applying uniform repeated pressing throughout. The distortion correction is localized to specific areas where dimensional deviations occur, avoiding excessive stress on hollow sections that could cause cracking.
Solution Approach 2:
The patent changes the parameters of distortion correction by using controlled, localized pressing forces rather than repeated heavy pressing. The correction process monitors dimensional changes and adjusts pressing parameters accordingly, eliminating distortion while maintaining the integrity of hollow shaft portions.
3Device complexity
If conventional machining is used for center hole, then manufacturing process is simple, but slightly out of tolerance workpiece cannot be optimized
Solution Approach 1:
The patent performs preliminary high-precision center hole machining before heat treatment, establishing the precise dimensional foundation early in the process. This preliminary action ensures that even if subsequent heat treatment causes slight distortions, the center hole precision can be maintained or corrected with minimal additional processing.
Data Source
AI summary
A center shaft machining apparatus includes: a grinding structure that moves on a machining central axis while rotating about the machining central axis and machines an end surface on one end side of a workpiece arranged on the machining central axis; an end portion support structure that supports an opposite end side of the workpiece; and a shaft portion support structure that supports a shaft support portion set at an intermediate portion of the workpiece. The end portion support structure includes an eccentric mechanism capable of supporting an opposite end of the workpiece in a state where a workpiece central axis of the workpiece is eccentric with respect to the machining central axis.