Gear Grinding Method Using Diagonal Feed for Crowning
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Solution Overview
Problem
Conventional gear grinding methods require complex adjustments of the center distance between the gear and the hourglass-shaped tool, leading to quadrant glitches and reduced machining accuracy, and are cumbersome when adjusting the crowning shape with a dress gear.
Innovation Solution
A gear grinding method using a gear-shaped grinding wheel with an hourglass shape, fed at a predetermined diagonal angle intersecting the workpiece rotation axis, synchronously rotated with the gear, to apply crowning, and a dress gear to adjust the grinding wheel's curvature, simplifying operations and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the center distance between the gear and the hourglass-shaped tool is adjusted according to the crowning shape, then the crowning process can be performed, but quadrant glitches occur due to backlash in the drive force transmission mechanism during quadrant switching
Solution Approach 1:
The invention pre-calculates and pre-positions the center distance between the gear and hourglass-shaped tool according to the desired crowning shape before machining begins. By establishing the correct center distance in advance based on the crowning requirements, the system avoids real-time adjustments during quadrant switching that would trigger backlash and quadrant glitches, thereby maintaining machining accuracy throughout the grinding process
2Adaptability or versatility
If the center distance is adjusted according to the crowning shape during feeding operations, then the crowning shape can be controlled, but the machining operations become complicated
Solution Approach 1:
The system pre-establishes the relationship between center distance and crowning shape before machining operations begin. By calculating and setting the appropriate center distance in advance according to the required crowning shape, the invention eliminates the need for complex real-time adjustments during feeding operations, thereby simplifying the machining process while maintaining the ability to produce different crowning shapes
Solution Approach 2:
The invention controls the crowning shape by changing the center distance parameter before machining begins. By establishing a clear relationship between the center distance parameter and the resulting crowning shape, the system enables versatile crowning shape control through a single parameter adjustment rather than through complex multi-parameter adjustments during the machining process
Data Source
AI summary
Provided is a gear grinding method capable of improving processing accuracy and easily adjusting the crowning shape by simplifying a processing operation. To this end, a work piece (W) is ground by a gear-shaped grinding stone (11) having a drum shape such that crowning along a tooth trace direction is applied to the work piece (W) by applying a relative feed in a feed direction (D1) that intersects a work piece rotation axis (C1) at a predetermined first diagonal angle (θ1) between the work piece (W) and the gear-shaped grinding stone (11) while the work piece (W) and the gear-shaped grinding stone (11) are synchronously rotated in the state of being engaged so as to have a predetermined crossed axes angle (Σ), and the curvature in a grinding stone width direction, which defines the drum shape of the gear-shaped grinding stone (11), and the first diagonal angle (θ1) are set according to the crowning shape of the work piece (W).