Jig-Based Workpiece Coordinate Setting for Thermal-Stable Machining
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Solution Overview
Problem
Machining efficiency declines due to increased cycle time and risk of thermal displacement errors when measuring workpiece positions within machining devices, particularly due to issues like dust, poor lighting, and temperature fluctuations.
Innovation Solution
A machining system and method utilizing a jig with a reference part for accurate positional measurement, a measurement device for relative positional analysis, and a temperature adjustment unit to synchronize temperatures between measurement and machining phases, allowing for precise workpiece positioning and efficient machining without extending cycle time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement is performed inside the machining device, then positioning accuracy is improved, but cycle time increases and thermal displacement errors occur
Solution Approach 1:
The measurement of workpiece positions is performed before machining in a separate measurement device, allowing positioning data to be obtained in advance without interrupting the machining cycle. The workpiece is measured on the jig in the measurement device, and the positional information is stored for use during subsequent machining operations.
Solution Approach 2:
The system separates measurement and machining functions into distinct devices. The measurement device captures workpiece positions on the jig, while the machining device performs cutting operations. This segmentation allows measurement to occur outside the machining cycle, eliminating time loss while maintaining positioning accuracy.
2Measurement precision
If measurement is performed inside the machining device, then positioning accuracy is improved, but thermal displacement errors occur due to temperature changes
Solution Approach 1:
Workpiece positioning measurement is performed in advance in a temperature-stable measurement device before the machining process begins. This preliminary measurement captures accurate positional data without the thermal interference that occurs during machining operations.
Solution Approach 2:
The system introduces a separate measurement device as an intermediary between workpiece setup and machining. This intermediary device operates in a thermally stable environment and transfers positional information to the machining device, isolating the measurement process from thermal displacement effects.
3Productivity
If photographing means is provided inside machining device, then in-device measurement is enabled, but measurement accuracy deteriorates due to dust, cutting oil, and poor lighting
Solution Approach 1:
The measurement function is extracted from the machining device and placed in a separate measurement device. This extraction removes the photographing means from the contaminated machining environment, eliminating the problems of dust, cutting oil, and poor lighting that would otherwise degrade measurement accuracy.
Solution Approach 2:
The system creates a copy of the workpiece positional information through measurement in a clean environment. Instead of photographing directly in the machining device, the measurement device captures accurate positional data that is then transferred to the machining device for use during operations.
Data Source
AI summary
A machining system includes: a jig retaining a plurality of workpieces; a measurement device measuring the retained plurality of workpieces; and a machining device machining the retained plurality of workpieces. The jig has a reference part positioned or position detected by the machining device. The measurement device has: a measurement unit measuring a positional relationship of the retained plurality of workpieces relative to the reference part, and an input unit using a recording medium or communication to input measured positional information of the plurality of workpieces to the machining device. The machining device has: a jig coordinate system specifying unit specifying a coordinate system of the jig, by positioning or position measuring the reference part, and a workpiece coordinate system setting unit individually setting coordinate systems of each of the plurality of workpieces, based on the specified coordinate system, and the inputted positional information.