EDM Sensor Unit With Thermal Compensation Adjustment Blocks
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Solution Overview
Problem
Conventional electric discharge machines face accuracy issues due to thermal displacement of axis drive parts, leading to misalignment of tool electrodes, which is costly to correct with temperature sensors and requires complex calculations.
Innovation Solution
A sensor unit with a measurement scale, position detector, and adjustment blocks made of different materials, which curve due to temperature changes, allowing for automatic correction of position misalignment without complex software control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thermal displacement correction using temperature sensors is implemented, then misalignment of tool electrode due to thermal displacement can be corrected, but additional cost of purchasing multiple sensors and complex calculation processing are incurred
Solution Approach 1:
The patent extracts the thermal displacement correction function from a complex sensor-based system and implements it through a simple mechanical adjustment block structure. The adjustment block is detached from the axis drive part, allowing independent thermal expansion compensation without requiring temperature sensors or complex control systems.
Solution Approach 2:
The adjustment block performs self-service thermal compensation by automatically expanding or contracting in response to temperature changes. This self-adjusting mechanism eliminates the need for external temperature sensors, control units, and complex calculation processing, while still achieving thermal displacement correction.
2Reliability
If real-time temperature measurement is implemented, then thermal displacement can be corrected in real-time, but time lag in correction values and measurement errors occur when temperature cannot be accurately measured
Solution Approach 1:
The patent replaces the electronic sensor-based temperature measurement and calculation system with a direct mechanical thermal expansion system. The adjustment block physically responds to temperature changes through thermal expansion, eliminating measurement time lags and calculation delays inherent in sensor-based systems.
3Manufacturing precision
If alignment operation before machining is performed, then machining errors can be detected and corrected, but complex calculation processing and additional time are required
Solution Approach 1:
The adjustment block is pre-configured with adjustment amounts that correspond to expected thermal displacement. This preliminary setup allows the system to automatically compensate for thermal effects during machining without requiring real-time measurement, calculation, or iterative alignment operations.
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
The solution effectively corrects thermal displacement-induced misalignment with a simple configuration, improving machining accuracy and reducing costs by eliminating the need for multiple temperature sensors and complex calculations.
Implementation Method 1
Each of the pair of adjustment blocks is curved in the at least one axial direction due to a temperature change
Implementation Method 2
The sensor unit includes a pair of adjustment blocks... Each of the pair of adjustment blocks is curved in the at least one axial direction due to a temperature change
Data Source
AI summary
An electric discharge machine is provided. The electric discharge machine includes: an axis drive part moving a tool electrode in at least one axial direction; and a sensor unit detecting a linear movement position of the axis drive part in the axial direction. The sensor unit includes a measurement scale having a linear shape, a position detector scanning the measurement scale and obtaining position information, and a pair of adjustment blocks fixed to both ends of the measurement scale or the position detector and erected perpendicular to an extension direction of the measurement scale. The adjustment blocks are fixed to the axis drive part and are curved in the axial direction due to a temperature change.