Power Skiving Cutter Geometry for Clean Gear Tooth Tips
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Solution Overview
Problem
Power skiving tools often produce an undesirable interfering contour on the tooth tips of gearings due to the orthogonal alignment of transition faces between rake faces, which requires additional processing steps like grinding, increasing time and cost.
Innovation Solution
The power skiving tool features a cutting head with transition faces that are inclined at an angle greater than 0° relative to the adjacent rake faces, eliminating the orthogonal step between rake faces and preventing the formation of an interfering contour, allowing direct machining of tooth tips without prior internal turning or subsequent finishing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transition face is aligned orthogonally to the rake face, then the machining process is simple and fast, but an interfering contour is formed on the tooth tips
Solution Approach 1:
The patent changes the geometric parameter of the transition face from orthogonal alignment to inclined alignment at a specific angle (5° to 45°) relative to the rake face. This parameter modification eliminates the interfering contour on tooth tips while maintaining efficient machining, resolving the contradiction between productivity and manufacturing precision.
2Manufacturing precision
If internal turning is performed before power skiving, then the tooth tip surface is pre-formed, but additional processing time and cost are required
Solution Approach 1:
The patent extracts and eliminates the unnecessary internal turning preprocessing step by redesigning the transition face geometry. The inclined transition face enables the power skiving tool to directly produce high-quality tooth tips without prior internal turning, removing the redundant process step while maintaining precision.
Solution Approach 2:
The patent incorporates the tooth tip forming action directly into the power skiving process through the inclined transition face design. Instead of requiring separate preprocessing, the tool geometry is preliminarily configured to perform both the main skiving operation and the tooth tip formation simultaneously, eliminating sequential processing steps.
3Manufacturing precision
If subsequent grinding is performed after power skiving, then the interfering contour is removed, but additional processing steps and costs increase
Solution Approach 1:
The patent extracts and eliminates the subsequent grinding step by preventing the interfering contour from forming in the first place. The inclined transition face geometry ensures clean tooth tip formation during power skiving, removing the need for post-processing grinding operations.
Solution Approach 2:
The power skiving tool with the inclined transition face is self-sufficient in producing high-quality tooth tips without requiring additional finishing operations. The tool geometry itself provides the necessary functionality to create precise tooth tips, making the process self-service and eliminating dependency on subsequent grinding steps.
Data Source
AI summary
A power skiving tool, having a shank extending along a longitudinal axis of the tool and a cutting head arranged at a front end of the shank. The cutting head comprises a plurality of circumferentially arranged teeth, wherein each of these teeth comprises a planar rake face at a front end of the cutting head that faces away from the shank, wherein the rake face is inclined at an angle other than 90° with respect to the longitudinal axis. A transition face is in each case arranged between the rake faces of two adjacent teeth. The transition face is arranged at the front end of the cutting head and adjoins the rake faces of the two adjacent teeth. Surface normals in all points of the transition face form an angle greater than 0° with the rake faces of the two adjacent teeth.