Dental Restoration Machining With Spindle Current Wear Monitoring
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Solution Overview
Problem
Current methods for determining tool wear in dental restoration manufacturing are prone to error as they do not accurately assess the condition of grinders, leading to potential use of worn or damaged tools.
Innovation Solution
A manufacturing device and method that utilize a detecting device to measure spindle current and a calculating device to determine tool wear based on this measurement, allowing for accurate detection and compensation of tool wear, including automatic replacement when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If running meters are added up to determine grinder wear, then a simple monitoring method is achieved, but the actual wear cannot be accurately determined
Solution Approach 1:
The patent replaces the mechanical counting method (running meters) with an electrical measurement system that monitors spindle current. The detecting device measures the actual current consumption of the spindle motor, which directly reflects the mechanical load and tool wear condition, providing accurate real-time wear detection without relying on empirical mileage calculations.
2Ease of operation
If empirical values are used to trigger replacement messages, then operator notification is achieved, but worn or damaged tools cannot be reliably detected
Solution Approach 1:
The patent implements a feedback mechanism where the detecting device continuously monitors spindle current and feeds this information to the calculating device. The system compares actual current values against reference values or thresholds, and when deviations indicate tool wear or damage, the system automatically triggers replacement notifications. This closed-loop feedback ensures reliable detection of actual tool condition rather than relying on empirical estimates.
3Measurement precision
If multiple measured values of spindle current are processed, then calculation accuracy is improved, but computational complexity increases
Solution Approach 1:
The patent processes multiple spindle current measurements but applies selective filtering and averaging techniques rather than analyzing every possible parameter. The calculating device focuses on key statistical features (such as mean, standard deviation, or peak values) from the measured data set, achieving sufficient accuracy for wear detection without implementing overly complex analytical algorithms. This balanced approach provides accurate wear calculation while maintaining manageable system complexity.
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 detection of tool wear, ensuring high accuracy in dental restoration production and reducing material waste by allowing for timely replacement of worn tools, thus maintaining production quality.
Implementation Method 1
a detecting device or detector for detecting a spindle current of a turning spindle
Data Source
AI summary
A manufacturing device (100) for a dental restoration (200), including a tool (101) for machining a blank (201); a detector (103) for detecting a spindle current of a turning spindle (117); and a calculator (105) for calculating wear of the tool (101) based on the spindle current.