NC Tool Tip Compensation for Column Perpendicularity Errors
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Solution Overview
Problem
Existing numerical control apparatuses face difficulties in easily compensating for perpendicularity errors due to column tilt in machine tools, especially considering chronological changes and tool diameter differences, which affect machining quality.
Innovation Solution
A numerical control apparatus with a compensation data setting unit that allows users to input linear drive axis combinations, tilt directions, and perpendicularity errors, and a compensation amount calculation unit that generates a tool vector to calculate position compensation amounts based on tool length and diameter, enabling easy compensation of errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If grid point compensation is used to adjust assembly errors, then manufacturing precision is improved, but ease of operation deteriorates because it is difficult to measure errors at each grid point and calculate compensation amounts
Solution Approach 1:
The patent extracts the compensation calculation from a complex grid-based system to a simplified parameter-based system. Instead of measuring and calculating compensation for each grid point, the system only requires inputting three key parameters (perpendicularity errors Ex and Ey, and tool length L), automatically generating the necessary compensation data.
Solution Approach 2:
The patent changes the compensation approach from spatially-distributed grid point parameters to a small set of fundamental machine parameters (Ex, Ey, L). This parameter transformation simplifies the compensation setup while maintaining the ability to correct perpendicularity errors across the working area.
2Manufacturing precision
If conventional perpendicularity error compensation is used, then machining accuracy is improved, but adaptability deteriorates because tool diameter difference cannot be considered
Solution Approach 1:
The patent creates a universal compensation system that handles multiple error sources (column perpendicularity errors and tool diameter differences) through a single integrated calculation framework. The same three parameters (Ex, Ey, L) enable compensation for both types of errors, making the system adaptable to various tool and machine conditions.
3Manufacturing precision
If comprehensive error measurement is performed to improve machining precision, then manufacturing precision is improved, but device complexity increases due to additional measurement and calculation requirements
Solution Approach 1:
The patent extracts the essential error correction capability from a comprehensive measurement system, retaining only the three critical parameters (Ex, Ey, L) needed for perpendicularity compensation while eliminating the need for extensive grid point measurements and complex compensation calculations.
Data Source
AI summary
A numerical control apparatus for controlling a tool attached to a column of a machine tool includes a compensation data setting unit that sets, as selection input, a linear drive axis combination of the column, a tilt direction of the column, and a perpendicularity error of the column, and a compensation amount calculation unit that generates a tool vector from a tool length as a distance in an axial direction from a tool attachment position to a tool tip end and a tool diameter as a distance in a direction perpendicular to the axial direction from the tool attachment position to the tool tip end to calculate a position compensation amount of the tool tip end as a machining point in an execution program from the linear drive axis combination of the column, the tilt direction of the column, and the perpendicularity error of the column set by the compensation data setting unit and the tool vector.