Machine Tool Feed Carriage Motion Error Measurement Using Read Heads
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Solution Overview
Problem
Current machine tools require expensive and cumbersome laser length measurement devices to accurately measure motion errors, which increases costs and reduces efficiency in motion error measurement.
Innovation Solution
A feeding device equipped with parallel guide rails, sliders, a movable carriage, and read heads that utilize existing scales to detect motion errors, allowing for high-accuracy measurement without additional expensive equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser length measurement devices are used to measure motion errors, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The feeding device measures its own motion errors using its existing scale and read heads, eliminating the need for external laser length measurement devices. The system performs self-diagnosis by utilizing its own measurement components to detect positioning errors, thereby reducing device complexity and cost while maintaining measurement precision.
Solution Approach 2:
The existing scale and read heads, originally designed for position control, are also utilized for motion error measurement. This multi-functional use of components eliminates the need for separate measurement devices, reducing overall system complexity while maintaining measurement capabilities.
2Measurement precision
If laser length measurement devices are used to measure motion errors, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The feeding device automatically performs motion error measurements using its own scale and read heads without requiring external measurement equipment. This self-service capability simplifies operations by eliminating the need for operators to set up and operate complex laser measurement devices, making the measurement process more accessible and easier to perform.
3Productivity
If multiple laser length measurement devices are used to measure motion errors simultaneously, then productivity is improved, but cost increases
Solution Approach 1:
The existing scale and read heads serve dual purposes: position control during normal operation and motion error measurement during diagnostics. This eliminates the need for additional laser length measurement devices, maintaining measurement capability while reducing the quantity of equipment required.
Solution Approach 2:
The feeding device uses its own built-in measurement components to perform self-diagnosis, eliminating the need for external measurement devices. This self-service approach maintains measurement functionality while reducing equipment quantity and associated costs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient and accurate measurement of motion errors using existing scales, reducing costs and operational complexity, allowing for timely evaluation and maintenance of machine tool performance.
Implementation Method 1
read heads respectively arranged on at least two sliders selected from the at least four sliders and engaged with the guide rail having the scale arranged thereon, the read heads being configured to detect a position in the feeding direction and a position in a direction orthogonal to the feeding direction by reading information given to the scale
Data Source
AI summary
The present invention includes two guide rails (15, 16) arranged in parallel in a feeding direction, sliders (17, 19, 21, 23) arranged on the guide rails (15, 16), a movable carriage (3) mounted on the sliders (17, 19, 21, 23) and moved in the feeding direction, and a drive mechanism (11) moving the movable carriage (3).The present invention further includes a scale arranged along the feeding direction on the guide rails (15, 16), read heads (18, 20, 22, 24) respectively arranged on the sliders (17, 19, 21, 23) and detecting a position in the feeding direction and a position in a direction orthogonal to the feeding direction by reading information given to the scale, and a motion error calculator (70) calculating a motion error of the movable carriage (3) based on position information in two directions detected by the read heads (18, 20, 22, 24).