Gear Skiving Tool Phase Detection Without Cutter Shape Measurement
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Solution Overview
Problem
In gear machining by skiving, determining the phase of a gear cutting tool with respect to a rotary main spindle is time-consuming due to the complex shapes of the cutters, requiring frequent shape measurements and corrections after regrinding, especially with high replacement frequencies of gear cutting tools.
Innovation Solution
A machine tool equipped with a phase detecting unit that includes a detecting section and a calculating section to determine the phase of the working tool based on a detected portion on the holder portion, which does not change with regrinding, allowing phase determination without needing to know the cutter shapes, thus shortening the time required for phase matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the phase of the gear cutting tool is determined based on the shapes of the cutters, then the phase determination can be performed, but a long period of time is required due to the complicated shapes of the cutters
Solution Approach 1:
The invention introduces a detected portion on the holder as an intermediary element for phase determination. Instead of directly measuring the complex cutter shapes, the system uses a simple detected portion (such as a mark or feature on the holder) as a mediator that can be easily and quickly detected, thereby resolving the contradiction between accurate phase determination and time consumption
Solution Approach 2:
The invention creates a simplified copy or representation of the phase information through the detected portion on the holder. Rather than dealing with the full complexity of the cutter shapes, the system uses a simplified detected portion that carries the necessary phase information, making the measurement process faster while maintaining accuracy
2Adaptability or versatility
If the gear cutting tool is frequently replaced to perform different machining operations, then the versatility of the machining process is improved, but the time required to determine the phase of each new tool increases operational downtime
Solution Approach 1:
The detected portion on the holder serves as a universal intermediary that works with all gear cutting tools. When tools are frequently replaced, this standardized detected portion allows for rapid phase determination without requiring complex measurements of each new tool's cutter shapes, thus maintaining versatility while minimizing downtime
Solution Approach 2:
The detected portion is pre-configured on the holder before tool installation. This preliminary preparation means that when a tool is replaced, the phase determination can proceed immediately by detecting the pre-existing feature, rather than requiring time-consuming measurements of the new tool's complex geometry
3Duration of action of stationary object
If the cutters are reground to maintain cutting performance, then the tool life is extended, but the cutter shapes change and require re-measurement and correction of shape data
Solution Approach 1:
The detected portion on the holder acts as a stable intermediary that remains unchanged by the regrounding process. When cutters are reground to extend tool life, the phase can be re-determined by detecting this unchanged portion, avoiding the need to re-measure and correct the altered cutter shapes
Solution Approach 2:
The invention extracts the phase determination function from the cutter shapes themselves and relocates it to the detected portion on the holder. This separation means that changes to the cutters (such as regrounding) do not affect the phase reference, eliminating the need for re-measurement and data correction
Data Source
AI summary
A machine tool that generates internal teeth or external teeth on a cylindrical workpiece includes a workpiece holder, a column which is relatively movable to the workpiece holder, a rotary main spindle which is rotatable with respect to the column, a working tool which is held by the rotary main spindle, and a phase detecting unit which detects a phase of the working tool with respect to the rotary main spindle. The working tool includes a cutter portion which has cutters, a holder portion, and a detected portion which is formed on the holder portion. The phase detecting unit includes a detecting section which detects the detected portion, and a calculating section which calculates a phase angle of the detected portion with respect to a reference position of the rotary main spindle, based on a result detected by the detecting section.