Gear Cutting Tool Regrinding for Tooth Profile Accuracy
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Solution Overview
Problem
Gear cutting tools often fail to produce the exact tooth profile intended, leading to significant deviations, especially in larger workpiece batches, which complicates compensation during hard-fine machining and reduces tool service life.
Innovation Solution
The method involves shifting the countermeasure from dynamic corrections to design changes by grinding the gear cutting tool, specifically modifying the relative position of the cutting faces with respect to the tool axis of rotation, including changes in rake angles, to correct tooth profile deviations without altering the machine axis settings, thereby extending tool life and maintaining flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dynamic corrections via machine axis adjustments are applied to compensate for tooth profile deviations, then manufacturing precision is improved, but device complexity increases and tool life decreases due to shifted process forces
Solution Approach 1:
The invention changes the geometric parameters of the cutting tool itself (rake face angles and orientations) to compensate for tooth profile deviations. Instead of adjusting machine axis positions dynamically, the tool's rake face normal vectors are modified to directly correct the cutting geometry, thereby maintaining manufacturing precision while reducing device complexity
Solution Approach 2:
The invention inverts the conventional approach by modifying the tool geometry rather than adjusting the machine axes. Instead of changing the machine's kinematic parameters to compensate for errors, the tool's cutting edge geometry is adapted to inherently produce the correct tooth profile, eliminating the need for complex dynamic corrections
2Manufacturing precision
If dynamic corrections via machine axis adjustments are applied to compensate for tooth profile deviations, then manufacturing precision is improved, but tool life decreases due to increased load from shifted process forces
Solution Approach 1:
By changing the tool's rake face geometric parameters (angles and orientations) to match the required compensation values, the invention directly addresses tooth profile deviations without altering machine axis settings. This maintains stable process forces throughout tool life, preventing the increased loading that would otherwise reduce tool service life
3Manufacturing precision
If hard finishing is used to compensate for tooth profile deviations after hardening, then manufacturing precision is improved, but productivity decreases due to increased load on downstream process
Solution Approach 1:
The invention performs the correction action preliminarily by modifying the cutting tool's rake faces before the hardening and finishing processes. This preliminary geometric adaptation ensures that subsequent hardening requires minimal or no corrective finishing, thereby maintaining high productivity while achieving the required manufacturing precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the load on gear cutting tools, extends their service life, and allows for quick reactivation of the gear cutting tool, enabling continued machining with minimal disruption, while maintaining process flexibility and accuracy across various workpiece batch sizes.
Implementation Method 1
a grinding operation carried out on the gear cutting machine or on a grinding machine belonging to the machine group of the gear cutting machine
Data Source
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AI summary
The invention relates to a method for producing or machining, by cutting, an identical set of teeth on each of a plurality of workpieces, in particular at least four workpieces, of a workpiece batch on one or more gear-cutting machines (100) having a gear-cutting tool (S), which has a set of teeth having rake faces (5) and having an axis of rotation (B1), in rolling machining engagement, in which method, in the event that a deviation of a set of teeth from the tooth profile sought for said set of teeth is detected or expected, a countermeasure that counteracts said deviation is determined and the production/machining of additional workpieces of said workpiece batch is continued using the countermeasure, the countermeasure being, at least in part, a change in the position of the rake faces relative to the axis of rotation of the tool, which change is brought about by means of grinding performed on the gear-cutting machine or at a grinding machine (140) that belongs to the machine group of the gear-cutting machine.