Dental Restoration Tool Wear Detection Using Spindle Current
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Solution Overview
Problem
Current methods for determining grinder wear during dental restoration production are inaccurate, as they rely on empirical values and do not account for the actual condition of the grinder, potentially leading to the use of worn or defective tools.
Innovation Solution
A manufacturing device equipped with a detection device to measure the spindle current of a rotary spindle and a calculation device to calculate tool wear based on these measurements, allowing for precise detection of tool wear and enabling timely replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If empirical values are used to determine grinder wear, then the monitoring process is simple, but the accuracy of wear detection is poor
Solution Approach 1:
The patent replaces empirical wear determination methods with electrical measurement-based detection. By monitoring spindle motor current, the system substitutes mechanical wear assessment with electrical parameter analysis, achieving more accurate and objective wear detection without significantly increasing system complexity.
Solution Approach 2:
The system continuously monitors spindle current and provides feedback on tool wear status. This real-time feedback mechanism allows for accurate wear detection by comparing actual current values against reference values, enabling timely tool replacement decisions.
2Measurement precision
If spindle current monitoring is implemented, then tool wear detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The spindle motor current serves multiple functions: it drives the spindle and simultaneously provides wear detection data. This multi-functionality allows accurate wear measurement without adding separate sensing systems, thereby limiting the increase in device complexity.
Solution Approach 2:
The spindle motor inherently provides the measurement signal through its own current consumption during operation. The system uses the motor's operational characteristics to self-diagnose tool wear, eliminating the need for external sensors or complex measurement apparatus.
3Measurement precision
If multiple measured values are processed, then calculation accuracy is improved, but processing time increases
Solution Approach 1:
The system processes multiple current measurements but applies selective filtering and averaging only when necessary to achieve sufficient accuracy. This partial processing approach balances measurement precision with processing efficiency, avoiding unnecessary computational overhead.
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 provides accurate and real-time monitoring of tool wear, preventing the use of worn tools, reducing material waste, and ensuring high precision in dental restoration manufacturing.
Implementation Method 1
a detection device (103) for detecting a spindle current of a rotary spindle (117)
Data Source
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AI summary
The present invention relates to a manufacturing device (100) for a dental restoration (200), comprising a tool (101) for machining a blank (201); a detection device (103) for detecting a spindle current of a rotary spindle (117); and a calculation device (105) for calculating wear of the tool (101) based on the spindle current.