Surface Texture Measuring Instrument with Dynamic Mode Switching
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Solution Overview
Problem
Existing surface texture measuring instruments face challenges in maintaining high precision during scanning measurements due to property fluctuations and disturbances caused by the workpiece's surface texture, leading to unstable constant force scanning control and increased measurement time.
Innovation Solution
A surface texture measuring instrument with a stylus and measuring force detecting unit that includes a scanning controller to maintain a constant measuring force, a touch signal generating unit to detect oscillations, and a measurement value collecting unit that switches between scanning and touch measurement modes based on predetermined conditions, ensuring precise measurement without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If constant force scanning control is used to maintain high precision, then measurement precision is improved, but measurement time increases due to unstable control caused by workpiece surface texture fluctuations
Solution Approach 1:
The patent applies dynamics by making the measurement mode adjustable between scanning mode and touch mode. The system dynamically switches between these modes based on the stability of constant force scanning control, allowing it to adapt to varying workpiece surface conditions. This resolves the contradiction by enabling high precision through touch mode when scanning control becomes unstable, while maintaining efficiency through scanning mode when conditions permit.
Solution Approach 2:
The patent changes the operational parameter (measurement mode) from fixed scanning to variable switching between scanning and touch modes. By monitoring the stability of constant force scanning control and adjusting the measurement approach accordingly, the system maintains high precision without unnecessarily increasing measurement time. This parameter change allows the system to optimize between precision and time based on real-time conditions.
2Productivity
If scanning measurement mode is used to reduce measurement time, then productivity is improved, but measurement precision deteriorates due to unstable constant force scanning control
Solution Approach 1:
The system dynamically adjusts the measurement mode based on the stability of constant force scanning control. When scanning control is stable, the system operates in scanning mode for high productivity. When instability is detected, it switches to touch mode to maintain precision. This dynamic adaptation resolves the contradiction between productivity and precision.
Solution Approach 2:
The patent implements feedback by monitoring the stability of constant force scanning control and using this information to determine the appropriate measurement mode. The system continuously evaluates control stability and adjusts its operation accordingly, ensuring that productivity is maximized when conditions permit while maintaining precision when necessary. This feedback mechanism resolves the contradiction between productivity and measurement precision.
3Measurement precision
If manual switching between scanning and touch measurement modes is implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by implementing automatic mode switching based on the stability of constant force scanning control. The system autonomously determines when to switch between scanning and touch modes without requiring manual intervention. This self-service capability maintains high precision while avoiding the complexity of manual switching mechanisms, resolving the contradiction between precision and device complexity.
Solution Approach 2:
The system uses feedback from the constant force scanning control stability to automatically determine the appropriate measurement mode. This automated feedback-based switching eliminates the need for complex manual intervention systems while maintaining measurement precision. The feedback mechanism enables the system to adapt to varying conditions and maintain precision without increasing device complexity through manual switching requirements.
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 instrument ensures high precision and stable constant force scanning measurements, reducing measurement time by automatically adjusting between scanning and touch measurement modes, thus overcoming fluctuations and disturbances.
Implementation Method 1
an oscillation element 4 that oscillates the stylus 3 (in an axial direction of the stylus 3)
Implementation Method 2
The oscillation element 4 and the detection element 5 are each formed by a piezoelectric element
Implementation Method 3
a stylus 3 having a contact portion that contacts a surface of a workpiece and a measuring force detecting unit that detects a measuring force when the contact portion contacts the surface of the workpiece
Data Source
AI summary
A surface texture measuring instrument includes a force sensor (1), an actuator (11) and a detector (12). The surface texture measuring instrument further includes: a scanning controller (54) that collects a detection signal from the force sensor (1) and drives the actuator such that the detecting signal coincides with a target measurement value; a touch signal generator (51) that generates a touch signal when the detection signal from the force sensor (1) coincides with the target measurement value; and a measurement value collecting unit (55) that collects a measurement value from a counter (26) at a predetermined time interval in a state where a fluctuation range of the detection signal from the force sensor (1) is within a preset range when a scanning controller is in operation, the latch counter (52) collecting a measurement value from a latch counter (52) each time the touch signal is generated in a state where the detection signal from the force sensor (1) oscillates and an amplitude exceeds the preset range.