Stepped Measurement Body for 3-Axis Machine Tool Error Compensation
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Solution Overview
Problem
3-axis machine tools face significant geometric accuracy issues due to various linear, rotational, and perpendicularity deviations, which cumulatively lead to substantial overall errors in workpiece machining.
Innovation Solution
A measurement body with a specific geometric configuration, including a base plate, stepped triangular, and square walls, is used to detect and compensate for geometric deviations in 3-axis machine tools. This measurement body is designed to be simple, cost-effective, and capable of detecting all 21 possible geometric errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex measurement systems are used to detect all 21 geometric deviations, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The measurement body is segmented into distinct functional components: a base plate with precisely positioned holes for linear axis measurement, and stepped walls with holes for rotational deviation measurement. This segmentation allows each component to be optimized for its specific measurement function while maintaining overall simplicity.
Solution Approach 2:
The measurement body serves multiple functions simultaneously: it measures all 21 geometric deviations (linear, rotational, and perpendicularity errors) using a single integrated structure. The same measurement body can be used for comprehensive error detection without requiring separate measurement devices for each type of deviation.
2Manufacturing precision
If comprehensive geometric error compensation is implemented, then manufacturing precision is improved, but loss of time increases due to complex measurement procedures
Solution Approach 1:
The measurement body is pre-configured with precisely positioned holes and stepped structures that encode geometric reference information. This preliminary preparation allows for rapid data acquisition during measurement, as the measurement system simply needs to detect the positions of these pre-established features rather than creating measurement references during the measurement process.
Solution Approach 2:
The measurement body enables comprehensive feedback by providing data on all 21 geometric deviations simultaneously. This complete feedback set allows the control system to calculate and apply compensations for all error sources, achieving high manufacturing precision through systematic error correction based on comprehensive measurement data.
3Ease of manufacture
If simple measurement bodies are used, then ease of manufacture is improved, but measurement precision deteriorates
Solution Approach 1:
The measurement body applies local quality by concentrating high-precision features at critical locations: the holes in the base plate are precisely positioned for linear axis measurement, and the stepped walls with holes provide accurate rotational deviation references. The majority of the measurement body can be manufactured with standard tolerances, while only specific local features require ultra-precise fabrication.
Solution Approach 2:
The measurement body utilizes parameter changes in its geometry to encode measurement information: the varying heights of the stepped walls and the specific positions of holes create a geometric code that allows precise determination of all 21 deviations. By carefully selecting these geometric parameters during design, high measurement precision is achieved without requiring the entire measurement body to be manufactured with ultra-precise tolerances.
Data Source
AI summary
The invention relates to a measurement body for checking geometric deviations in a 3-axis machine tool comprising a base plate, a first wall which protrudes perpendicularly from the base plate, a second wall which protrudes perpendicularly from the base plate and is arranged perpendicularly to the first wall. A first row of holes and a second row of holes are formed in the base plate. The first wall is a stepped triangle and comprises a step-shaped region having a plurality of steps, on an upper, exposed region. The second wall is a square wall and comprises a first row of wall holes on an upper, exposed region which extends in parallel with the base plate. The first row of holes is arranged in parallel with the row of step holes and the second row of holes is arranged in parallel with the first row of wall holes.