NC Tool Position Correction for Worn Tool Contour Errors
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Solution Overview
Problem
Existing NC processing machines require rewriting of the NC program whenever a tool is replaced or worn out, leading to inefficiencies and increased complexity due to errors in the tool's contour affecting workpiece shape accuracy.
Innovation Solution
A method and machine that use an arithmetic expression in the NC program to calculate the tool's position, incorporating correction values for contour errors at multiple processing points, allowing for continuous use of the NC program without the need for frequent rewriting, by measuring and adjusting for tool shape deviations in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If concrete numerals are used in the NC program to move the tool, then the program can be executed with specific tool positions, but the program must be rewritten each time the tool is replaced or worn out
Solution Approach 1:
The patent changes the parameter representation from fixed concrete numerals to variable-based expressions. The NC program uses parameters (e.g., tool radius, correction values) that can be dynamically updated without rewriting the entire program. This allows the same program to adapt to different tool conditions while maintaining manufacturing precision.
Solution Approach 2:
The patent introduces dynamic correction values that are calculated and updated based on actual tool measurements. Instead of static positions, the system dynamically adjusts tool positions using correction data stored in memory, allowing the program to adapt to tool wear and replacement without rewriting.
2Manufacturing precision
If the NC program is rewritten each time the tool is replaced or worn out, then the tool position can be accurately adjusted, but processing time and operational complexity increase
Solution Approach 1:
The patent performs preliminary measurement of tool contour errors using a tool shape measuring device before machining. The correction values are calculated and stored in advance in the control device's memory, so when machining begins, the corrected positions are already prepared and can be applied immediately without time-consuming program rewriting.
Solution Approach 2:
The patent creates a digital copy of the tool's actual contour through measurement and stores it as correction data. This digital representation allows the system to reference and apply corrections without physically reprogramming, replacing the need to rewrite NC codes with a simple data lookup and application process.
3Manufacturing precision
If correction values are calculated for multiple processing points, then tool contour errors are more accurately corrected, but calculation complexity increases
Solution Approach 1:
The patent divides the tool contour into multiple discrete measurement points around the tool periphery. Each point's error is measured and stored separately, allowing the system to selectively apply corrections based on the specific processing location. This segmentation enables accurate multi-point correction while keeping individual calculations manageable and organized.
Data Source
AI summary
A method for processing a workpiece with a tool is provided with holding the workpiece, holding the tool, and moving the held tool relative to the held workpiece in accordance with an NC program including an arithmetic expression to calculate a position of the held tool.