Spindle Load Control Using Quantile-Based Target Setting
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Solution Overview
Problem
Setting an appropriate target spindle load for constant spindle load control is challenging, requiring significant human effort and varying based on tools, work shapes, and materials, making it difficult to achieve both reduced cycle time and extended tool life.
Innovation Solution
A control device that measures spindle loads as time-series data during machining, defines a stable machining load range, and automatically sets this as the target spindle load, using quantile calculation to facilitate easy setting without prior experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If test machining is performed and maximum load is set as target spindle load, then setting becomes easier, but target load becomes too high leading to extended cycle time
Solution Approach 1:
The system automatically identifies stable machining portions and calculates target spindle load based on measured load data during test machining, eliminating the need for operator expertise in setting target loads while avoiding the pitfall of using maximum load values
Solution Approach 2:
The system measures actual spindle load during test machining, uses this feedback data to identify stable machining portions, and automatically sets target load based on quantile calculation from the measured data, creating a closed-loop setting process
2Measurement precision
If human expertise is used to set target spindle load, then appropriate value can be determined, but significant time and effort are required
Solution Approach 1:
The control device automatically performs target spindle load setting by measuring load data during test machining, identifying stable machining portions, and calculating quantile-based target values, completely replacing the need for human expertise and significantly reducing setting time
Solution Approach 2:
The system replaces human expert judgment with an automated algorithm that measures load data, identifies stable portions through analysis, and calculates target values using quantile methods, substituting mechanical human operation with automated computational processing
Data Source
AI summary
A control device calculates a specified quantile in stored data relating to a load applied on a spindle, as a target spindle load, and controls a feed speed of the spindle as to a work, so that the measured load applied on the spindle is the calculated target spindle load. A user can set the target spindle load with the load on the spindle measured in a state in which the work is being stably machined as a reference.