Optical Tool-Holder Target for Single-Step 3D Machine Tool Alignment
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Solution Overview
Problem
Current machine-tool measurement techniques are limited in accurately determining the three-dimensional relative position between the tool-holder and work-holder, particularly due to wear and thermal drift, requiring multiple measurement steps and increasing costs and implementation time.
Innovation Solution
A machine-tool equipped with an optical measuring device featuring a three-dimensional target with a planar and inclined surface, allowing for simultaneous three-dimensional measurement of the relative position through a single exposure step, independent of real-time variables like tool wear and thermal variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional two-dimensional measurement techniques are used to measure relative position between tool-holder and work-holder, then measurement can be performed, but measurement precision is insufficient for three-dimensional positioning and requires multiple measurement steps
Solution Approach 1:
The patent applies dimensionality change by transitioning from two-dimensional measurement to three-dimensional measurement through the introduction of an inclined surface element. The inclined surface, positioned at a known angle relative to the reference surface, enables the optical measurement system to capture depth information (Z-axis) in addition to the conventional X and Y coordinates. This allows single-step three-dimensional positioning without requiring multiple measurement steps or complex multi-system arrangements.
Solution Approach 2:
The patent uses an intermediary target element mounted on the tool-holder that includes both a reference surface and an inclined surface. This intermediary target serves as a mediator between the optical measurement system and the tool-holder, enabling indirect measurement of the three-dimensional relative position. The target element translates physical position information into optical signal variations that can be processed by the measurement system.
2Measurement precision
If multiple measurement steps are used to achieve three-dimensional positioning, then measurement completeness is improved, but measurement time and implementation cost increase
Solution Approach 1:
The patent merges multiple measurement functions into a single measurement step by combining the reference surface measurement (for X and Y coordinates) and the inclined surface measurement (for Z coordinate) into one simultaneous optical capture. The optical system captures images of both surfaces concurrently, and the processing unit computes all three-dimensional position information from this single dataset, eliminating the need for sequential measurement steps.
Solution Approach 2:
The patent applies preliminary action by pre-positioning the inclined surface at a known, fixed angle relative to the reference surface during target fabrication. This pre-established geometric relationship encodes the depth information in advance, allowing the measurement system to derive Z-coordinate information directly from the captured image without requiring additional measurement actions or calculations during the actual measurement process.
3Productivity
If conventional measurement techniques are used during production phase, then production can continue, but thermal drift and tool wear affect measurement accuracy
Solution Approach 1:
The patent implements feedback by continuously monitoring the relative position between tool-holder and work-holder using the optical measurement system during the production phase. The system captures images of the target element, processes the three-dimensional position data, and provides real-time feedback on positioning accuracy. This enables detection and compensation of drift caused by thermal expansion or tool wear, maintaining measurement precision throughout continuous operation.
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 precise, single-step three-dimensional positioning with high accuracy and reduced measurement time, eliminating the need for multiple steps and adjustments, thus improving machining quality and efficiency.
Implementation Method 1
an optical measuring device featuring a three-dimensional target with a planar and inclined surface, allowing for simultaneous three-dimensional measurement of the relative position
Data Source
AI summary
A machine-tool including a machining module equipped with a tool-holder and a work-holder, and an optical measuring device-for the three-dimensional measurement of the relative position between the tool-holder and the work-holder. The optical measuring device includes an optical system mounted on the work-holder and a target mounted on the tool-holder. The target includes a useful face forming a positioning reference that can be placed in the optical axis of the optical system.