Axial Feed Position Rounding for Accurate Machine Tool Stops
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Solution Overview
Problem
In continuous axial feed operations of machine tools, variations in the stopping position and movement of objects occur due to operator timing errors, especially at higher axial feed rates, leading to inaccuracies in desired versus actual stopping positions.
Innovation Solution
A control device and method that include an input unit for specifying axial feed rates, a motor driving control unit, an amount-of-movement detecting unit, a coordinate position detecting unit, and a rounding processing unit to round the coordinate position or amount of movement to a predetermined place corresponding to the axial feed rate, ensuring accurate stopping positions even when the operator releases the feed operation at varying times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the axial feed rate is increased to improve productivity, then the axial feed speed increases, but the error between the desired stopping position and the actual stopping position becomes larger
Solution Approach 1:
The control device performs preliminary rounding processing on the coordinate position or amount of movement before the axial feed operation stops. By pre-calculating the rounded target value based on the specified axial feed rate, the system prepares the correction amount in advance, allowing the motor to automatically adjust the stopping position even when the operator releases the operation key at varying times.
Solution Approach 2:
The control device uses feedback from the detected coordinate position or amount of movement to calculate the rounding error. The motor driving control unit then drives the motor to move the object by this calculated rounding error amount, correcting the stopping position based on the actual detected values and the pre-determined rounded target value.
2Ease of operation
If the operator timing varies when releasing the axial feed operation, then the ease of operation is maintained, but the variation in stopping position increases
Solution Approach 1:
The control device enables the system to self-correct the stopping position automatically. The rounding processing unit and motor driving control unit work together to calculate and execute the necessary position correction without requiring additional operator intervention or precise timing from the operator, allowing the system to compensate for its own stopping position errors.
Solution Approach 2:
The control device determines the rounded target value and calculates the rounding error amount in advance based on the specified axial feed rate. This preliminary calculation allows the system to automatically adjust the stopping position regardless of when the operator releases the operation key, maintaining both operational flexibility and positioning consistency.
Data Source
AI summary
A control device includes: an input unit; a motor driving control unit; an amount-of-movement detecting unit; a coordinate position detecting unit; a display unit; and a rounding processing unit configured to perform rounding processing to round the coordinate position and the amount of movement of an object to be moved, to a rounding place corresponding to an axial feed rate. The motor driving control unit drives motors such that at least one of the coordinate position and the amount of movement of the moved object is rounded.