Gear-Cutting Machine Auxiliary Motion for Tool Wear
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing gear-cutting methods face challenges in achieving balanced wear between leading and trailing flanks of cutting tools, leading to reduced tool service life and inefficient material removal.
Innovation Solution
The method involves superimposing an auxiliary motion on the rolling motion during gear tooth generation, connecting flank cuts from consecutive passes to minimize U-chip production and extend tool life by ensuring the cutting edge no longer cuts the guide surface, thus reducing wear and increasing tool longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If symmetric cutting strategy is used to balance wear between leading and trailing flanks, then tool service life is extended, but U-chip generation continues to occur reducing machining efficiency
Solution Approach 1:
The patent applies asymmetry by intentionally creating an asymmetric cutting pattern where flank cuts in consecutive passes are connected only on one side (trailing flank) rather than symmetrically on both sides. This asymmetric approach eliminates U-chips on the trailing flank while accepting increased chip thickness on the leading flank, thereby resolving the contradiction between tool life and machining efficiency.
Solution Approach 2:
The cutting process is segmented into distinct phases: passes that create connected flank cuts on the trailing side, and finishing passes without auxiliary motion. This segmentation allows optimization of different cutting zones independently, eliminating harmful U-chips in the roughing phase while maintaining precision in the finishing phase.
2Productivity
If rolling motion is used for gear tooth generation, then material removal is efficient, but flank cuts from consecutive passes remain disconnected generating U-chips
Solution Approach 1:
The patent introduces a dynamic auxiliary motion component that varies the phase angle between tool and workpiece rotations. This dynamic adjustment allows the cutting edges to trace connected paths on the trailing flank across consecutive passes, eliminating U-chips while preserving the efficient material removal characteristics of rolling motion.
Solution Approach 2:
The auxiliary motion is applied in preliminary passes to pre-establish connected flank cut patterns before finishing passes. This preliminary action prepares the tooth flanks in a way that prevents U-chip formation in subsequent operations, improving overall process efficiency.
Data Source
AI summary
The invention concerns a method of generating gear teeth, wherein a workpiece which is to receive a toothed profile and a cutting tool are advanced toward each other in a rolling feed motion until each tooth flank of the gear profile has been generated after several passes of the tool, wherein in each pass a cut surface containing at least one flank cut is generated on the workpiece, wherein an auxiliary motion is superimposed on the rolling motion, which has the effect that the flank cuts generated in at least two immediately consecutive passes will be connected to each other. In addition, the invention also concerns a gear-cutting machine with the requisite control features to perform the method.