Power Skiving Cutter Orientation for Independent Gear Flank Angle Correction
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Solution Overview
Problem
Existing power skiving methods for manufacturing gears face challenges in independently correcting pressure angles of gear teeth, often requiring re-working of cutter profiles or manufacturing new cutter disks, especially for large pressure angle changes, which can be impractical due to constraints like maintaining slot width.
Innovation Solution
A method involving three-dimensional cutter rotations relative to the gear workpiece tooth flank surfaces to reposition the cutter, allowing for independent adjustments of pressure angles by positioning the cutting tool around specific geometric references such as profile symmetry lines, tangents, and normals, enabling decreases or increases in pressure angles on both left and right tooth flank surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cutter profiles are re-worked or new cutter disks are manufactured to correct pressure angles, then pressure angle correction is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention applies dynamics by making the cutter disk tiltable and rotatable about its axis during the power skiving process. This allows the cutter profile to be dynamically repositioned in three-dimensional space relative to the workpiece tooth flank surfaces, enabling pressure angle corrections without modifying the cutter disk itself. The dynamic adjustment of cutter orientation replaces the need for static re-work or new cutter manufacturing.
Solution Approach 2:
The invention changes the operational parameters of the cutter disk by introducing tilt angle and rotation angle variables. By varying these parameters during machining, the effective pressure angle can be corrected independently for left and right flank surfaces. This parameter-based adjustment avoids the complexity of physical cutter modifications while achieving precise pressure angle control.
2Manufacturing precision
If conventional power skiving methods are used, then manufacturing process is simple, but independent pressure angle correction on left and right flanks is not possible
Solution Approach 1:
The invention transitions from conventional two-dimensional cutter positioning to three-dimensional cutter positioning by adding tilt and rotation degrees of freedom. This dimensional enhancement allows independent correction of pressure angles on left and right flanks simultaneously, as the cutter can be oriented in multiple angular positions relative to the workpiece, achieving independent flank control without excessive complexity.
3Manufacturing precision
If cutter is re-positioned using three-dimensional rotations, then independent pressure angle correction is achieved, but process complexity increases
Solution Approach 1:
The invention makes the cutter positioning system multi-functional by enabling it to perform both conventional power skiving and pressure angle correction operations through the same three-dimensional rotation mechanism. The cutter can be positioned for standard machining while simultaneously being tilted and rotated for pressure angle adjustment, combining multiple functions into a single integrated operation that reduces overall process complexity.
Data Source
AI summary
A power skiving method wherein three-dimensional cutter rotations relative to gear workpiece tooth flank surfaces are carried out so as to reposition the cutter relative to a gear workpiece so as to achieve a decrease and/or an increase in the pressure angle of the tooth flank surfaces. The method can be applied independently to left and right flank surfaces of a tooth slot or the rotations may be superimposed on one another to realize pressure angle corrections on both tooth flanks of a tooth slot.