Chamfering Machine Tool Dynamic Radius Compensation
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Solution Overview
Problem
Conventional machine tools for chamfering workpieces require complex programming and frequent tool changes due to progressive wear, limiting versatility and efficiency, especially when changing tool shape or material, and are not applicable to tools with linear movement axes.
Innovation Solution
A machine tool with at least three linear movement axes and a numerical controller that performs corner chamfering by calculating and compensating tool radius and axis movements based on machining distances and tool data, allowing the entire cutting edge of the tool to be used, thereby extending tool lifespan and maintaining constant machining peripheral speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the same part of the cutting edge is always used for chamfering, then the machining precision is maintained, but the tool lifespan is limited due to progressive wear
Solution Approach 1:
The patent implements dynamic tool radius compensation that automatically adjusts the tool path based on the actual tool radius and wear characteristics. The numerical controller calculates compensation values in real-time during machining, allowing the cutting edge position to be dynamically adjusted without manual intervention, thus maintaining precision while extending tool usage
2Duration of action of moving object
If the tool diameter is changed to increase usage times, then the tool lifespan is improved, but the machining program must be modified by expert programmers
Solution Approach 1:
The system implements self-service through automatic tool radius compensation calculation. The numerical controller automatically computes the compensation values based on tool data and machining parameters without requiring expert programmer intervention. This eliminates the need for manual program modification when tool specifications change, while still achieving extended tool lifespan through optimized cutting edge utilization
3Duration of action of moving object
If the tool radius compensation is adjusted to use different parts of the cutting edge, then the tool lifespan is extended, but the machining quality may vary
Solution Approach 1:
The patent implements feedback control through automatic tool radius compensation. The system continuously monitors machining conditions and adjusts the tool path compensation values in real-time based on actual tool characteristics and wear patterns. This closed-loop control ensures that machining quality remains consistent even as different portions of the cutting edge are utilized, thereby extending tool lifespan without sacrificing precision
4Manufacturing precision
If the spindle rotational frequency and feed rate are changed to maintain constant peripheral speed, then the machining quality is maintained, but the control complexity increases
Solution Approach 1:
The numerical controller implements self-service by automatically calculating and adjusting spindle rotational frequency and feed rate to maintain constant peripheral speed. The system uses the formula Vc = π × D × n (where Vc is peripheral speed, D is tool diameter, and n is rotational frequency) to dynamically adjust parameters based on actual tool conditions, eliminating the need for manual control complexity while maintaining consistent machining quality
Data Source
AI summary
After a Z-axis on which a chamfering tool is mounted is located in a machining position for chamfering, two orthogonal axes (X- and Y-axes) perpendicular to the Z-axis are positioned to be ready for the chamfering. The Z-axis is compensated simultaneously with the X- and Y-axes in accordance with a machining path in a machining program, based on tool data, whereby the entire cutting edge of the chamfering tool can be used for each chamfering cycle. Specifically, the radius of the tool is made variable so that a chamfering area can cover the entire cutting edge of the tool.