Power Skiving Cutter Pressure Angle Correction
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Solution Overview
Problem
Existing power skiving methods require costly and time-consuming regrinding or three-dimensional cutter inclinations to correct pressure angle errors, which can distort tooth profiles and reduce tool life, making it difficult to adjust pressure angles without altering the tool's geometry.
Innovation Solution
The method involves shifting the axial blade reference point to change the radial location of the involute profiles on the cutting blades, allowing for pressure angle adjustments without altering the tool's geometry, maintaining the same tooth thickness and slot width while changing the pressure angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If regrinding or three-dimensional cutter inclinations are used to correct pressure angle errors, then pressure angle accuracy is improved, but tool geometry is altered and tool life is reduced
Solution Approach 1:
The patent changes the pressure angle by adjusting the radial position of the reference point on the cutting blade rather than altering the blade geometry itself. By moving the reference point radially outward or inward, the effective pressure angle changes while the blade maintains its original geometry and coating, thus preserving tool life while achieving pressure angle correction
2Manufacturing precision
If regrinding or three-dimensional cutter inclinations are used to correct pressure angle errors, then pressure angle accuracy is improved, but additional costs and time are incurred
Solution Approach 1:
The method allows pressure angle correction by simply adjusting the radial position of the reference point, which can be done through calculation and programming of the machining parameters rather than physical modification of the tool. This eliminates the time-consuming regrinding process while achieving the desired pressure angle accuracy
Solution Approach 2:
Instead of physically modifying the original blade geometry through regrinding, the patent creates a virtual correction by changing the reference point position in the machining parameters. This digital/parametric copying approach avoids the time and cost of physical tool modification while achieving the same corrective effect
3Manufacturing precision
If three-dimensional cutter inclinations are used to correct pressure angle errors, then pressure angle accuracy is improved, but tooth profile distortion occurs
Solution Approach 1:
The patent isolates the pressure angle adjustment to a pure radial position change of the reference point, avoiding the complex three-dimensional inclination adjustments that would simultaneously affect multiple geometric parameters. This selective parameter change achieves pressure angle correction while maintaining the integrity of the tooth profile shape
Data Source
AI summary
Cutting blade pressure angle changes or corrections in power skiving cutters (20) can be realized without the need tor a tool geometry change. An axial shift (26) of the blade reference point (24) will shift the existing involute on the blade profiles (22, 23) into a different radial location. An accompanying shift (AR) of the reference involute profile (30) by approximately the same amount and in the same direction will re-establish the relationship between work gear and cutter. The resulting work gear geometry has the same radial location of the slots, with the same slot width and the same tooth thickness but with a changed pressure angle.