Spur Gear Tooth Flank Crowning via Control Data Generation
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Solution Overview
Problem
Existing methods for producing spur gear teeth on universal machine tools are limited in achieving desired width crowning without cumbersome post-processing, and they lack the flexibility to modify tooth flank geometry efficiently during the machining process.
Innovation Solution
A method for generating control data that allows for the specification of parameters to modify the tooth flank geometry based on desired crowning, enabling the direct creation of a tooth flank with the desired width crowning during machining, using a numerically controlled machine tool with at least 5 axes, by successively traversing machining paths with a milling tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional gear-forming single-purpose machines are used to machine tooth flanks with profile hobbing tools or profile grinding wheels, then the tooth flanks can be worked out with the desired profile shape, but the method lacks flexibility to modify tooth flank geometry efficiently and requires cumbersome post-processing to achieve width crowning
Solution Approach 1:
The patent applies preliminary action by calculating and storing reference points on the tooth flank geometry before machining begins. These reference points are used during machining to automatically adjust the tool path and achieve the desired width crowning without post-processing. The control data is prepared in advance with embedded geometry modification parameters that are executed during the machining process itself.
Solution Approach 2:
The patent implements parameter changes by modifying the tooth flank geometry through calculated reference points that define the crowning profile. The system changes geometric parameters by determining offset distances from reference points to the tooth flank surface, and these parameter modifications are directly incorporated into the control data for the machining process, enabling flexible geometry adjustment without post-processing operations.
2Manufacturing precision
If control data is generated without pre-calculating reference points and geometry modifications, then the machining process is simpler, but the desired width crowning cannot be achieved without cumbersome post-processing
Solution Approach 1:
The patent applies preliminary action by calculating and storing reference points on the tooth flank geometry before machining begins. These reference points are used during machining to automatically adjust the tool path and achieve the desired width crowning without post-processing. The control data is prepared in advance with embedded geometry modification parameters that are executed during the machining process itself.
Solution Approach 2:
The patent uses copying by creating a digital model of the tooth flank geometry with embedded reference points and offset calculations. This digital copy contains all the geometry modification information needed to achieve the desired width crowning, and it is used to generate the control data without requiring physical prototypes or post-processing trials.
3Adaptability or versatility
If standard milling tools are used on universal machine tools with successive traversing of machining paths, then the method is more versatile compared to special gear cutting machines, but the capability to efficiently achieve desired width crowning is limited
Solution Approach 1:
The patent implements parameter changes by modifying the tooth flank geometry through calculated reference points that define the crowning profile. The system changes geometric parameters by determining offset distances from reference points to the tooth flank surface, and these parameter modifications are directly incorporated into the control data for the machining process, enabling flexible geometry adjustment without post-processing operations.
Solution Approach 2:
The patent applies universality by developing a control data generation method that works with standard milling tools on universal machine tools while achieving precision comparable to special-purpose gear cutting machines. The method uses a generalizable approach of calculating reference points and offset distances that can be applied to various tooth flank geometries and crowning requirements, making the system versatile and adaptable to different machining scenarios.
Data Source
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AI summary
The method involves setting the tooth flank geometry of the spur gear tooth. The parameters for changing the tooth flank geometry as a function of desired crowning of the tooth, are set. The control data is generated based on the set parameters according to the modified tooth flank geometry. The modified tooth flank geometry is set with the desired crowning having specific number of teeth. Independent claims are included for the following: (1) device for generating control data for manufacturing tooth of spur gear; (2) numerically controlled machine tool; and (3) computer program product for generating control data for manufacturing tooth of spur gear.