Surface Texture Measuring Machine Automated Tolerance Calculation
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Solution Overview
Problem
Existing surface texture measuring machines require cumbersome manual input of tolerances for multiple parameters, increasing setup time and effort, especially when judging the surface texture of workpieces.
Innovation Solution
A surface texture measuring machine and method that calculates judgment values based on displacement measurement data from a master workpiece or an average of multiple workpieces, eliminating the need for manual tolerance input by using predetermined ratios relative to reference values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual tolerance input is used for each parameter, then judgment accuracy can be ensured, but setting work and time consumption increase significantly
Solution Approach 1:
The system performs preliminary measurement of a master workpiece to establish reference values and tolerances before actual workpiece judgment. The judgment value calculation unit calculates reference values and tolerances based on the master workpiece measurement data, so that when actual workpieces are measured, the comparison can be made immediately without manual tolerance input for each parameter.
Solution Approach 2:
The system creates a digital copy or model of the master workpiece by measuring it first. This master workpiece data serves as a template that is then used for comparing subsequent workpieces. The judgment value calculation unit uses the master workpiece measurements to generate judgment values that are automatically applied to future measurements, eliminating repeated manual tolerance setting.
2Reliability
If multiple parameters are used for judgment, then comprehensive quality control is achieved, but the complexity of tolerance input increases
Solution Approach 1:
The judgment value calculation unit serves multiple functions: it calculates reference values for different parameters (Ra, Ry, etc.), determines tolerances for each parameter, and generates judgment values automatically. This multi-functional unit handles all parameter-related calculations uniformly, allowing comprehensive quality control across multiple parameters without increasing operational complexity.
Solution Approach 2:
The system automatically adjusts and calculates different parameters (Ra, Ry, and other surface texture parameters) based on the master workpiece measurement data. The judgment value calculation unit dynamically computes appropriate tolerances and judgment values for each parameter type, allowing comprehensive multi-parameter quality control without requiring manual tolerance input for each parameter.
3Ease of operation
If automatic judgment value calculation is implemented, then setting work is reduced, but the system requires additional calculation functionality
Solution Approach 1:
The patent combines the measurement function and the judgment value calculation function into an integrated system. The judgment value calculation unit is merged with the measurement unit, allowing the system to automatically transition from measuring the master workpiece to calculating reference values and tolerances, and finally to comparing actual workpieces against these calculated values. This integration reduces setting work while the added calculation functionality remains contained within the existing system architecture.
Data Source
AI summary
A surface texture measuring machine includes: a parameter setting unit configured to set one or more parameters related to a surface texture of a workpiece; a measurement unit configured to calculate a measurement value corresponding to each of the parameters on the basis of displacement measurement data obtainable by scanning a surface of the workpiece or a master workpiece; a judgment value calculation unit configured to calculate a judgment value corresponding to each of the parameters with an assumption that the measurement value of the master workpiece is defined as a reference value and a value having a predetermined ratio relative to the reference value is defined as a tolerance; and a judgment unit configured to compare the measurement value of the workpiece and the judgment value for each of the parameters.