Universal Cutter Disk for Face Gear Tooth Flank Generation
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Solution Overview
Problem
Current methods for manufacturing face gears are complex, expensive, and inflexible, requiring job-specific special tools that are costly and time-consuming, with long machining times compared to cylindrical or bevel ring gears.
Innovation Solution
A cutter disk with cutting blades oriented perpendicular to its axis, allowing for orientation at the pressure angle of the mating face gear set's pinion and rotation around a virtual pinion axis to generate tooth flanks, utilizing a universal tool setup that reduces machining time by eliminating traversing feed motions and employing non-constant roll relationships to approximate the involute profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If special job-specific tools are used for face gear manufacturing, then manufacturing precision can be achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent applies universality by using a universal cutter disk that can manufacture different face gear designs through software control rather than requiring dedicated special tools for each design. The cutter disk with radially oriented cutting edges can generate various tooth profiles by varying the roll relationship and rotation speed, eliminating the need for multiple job-specific tools while maintaining manufacturing precision
Solution Approach 2:
The patent replaces complex mechanical tool geometries with a simpler cutter disk design where the cutting edges are radially oriented. Instead of using mechanically complex threaded grinding wheels or specialized hobs, the invention uses a disk with radial cutting edges controlled by software-defined roll relationships and rotation speeds to generate the required tooth profiles
2Manufacturing precision
If traditional face gear manufacturing methods are used, then tooth profiles can be generated, but machining time is significantly longer than cylindrical or bevel ring gears
Solution Approach 1:
The patent implements continuous useful action by eliminating traversing feed motions that were present in traditional methods. The cutter disk continuously rotates around the virtual pinion axis while the workpiece rotates, maintaining continuous cutting contact without interruption. This continuous rolling generation process significantly reduces machining time while maintaining tooth profile accuracy through software-controlled kinematics
Solution Approach 2:
The patent applies dynamics by using non-constant roll relationships where the ratio between cutter disk rotation speed and workpiece rotation speed varies during the generation process. This dynamic control allows the simple radial cutting edges to generate accurate involute profiles without requiring complex tool geometries or slow traversing motions, thereby increasing productivity while maintaining precision
3Manufacturing precision
If threaded grinding wheels with complex tool geometry are used, then face gear hard finishing can be achieved, but dressing time increases and flexibility decreases
Solution Approach 1:
The patent applies universality by replacing specialized threaded grinding wheels with a universal cutter disk that can handle different face gear designs through software control. The radial cutting edges combined with variable roll relationships allow the same tool to generate various tooth profiles and surface finishes without requiring physical reconfiguration or dressing, thereby increasing adaptability while maintaining surface finish quality
Solution Approach 2:
The patent uses parameter changes by varying the roll relationship and rotation speeds to adapt the cutter disk for different face gear designs. Instead of physically changing or dressing the tool geometry, the invention changes the kinematic parameters (rotation speeds, roll ratio) to generate different tooth profiles and surface finishes, significantly increasing tool flexibility and adaptability
Data Source
AI summary
A cutter disk having cutting blades oriented on its circumference with the cutting edges of the blades oriented perpendicular to the axis of rotation of the cutter disk thereby representing a plane which can be oriented to a work piece (e.g. face gear) under an angle equal to the pressure angle of the mating face gear set's pinion, and, which can be rotated around a virtual pinion axis to generate a tooth flank on the work piece.