Roughness Detector Skid Mechanism for Cam Face Measurement
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Solution Overview
Problem
Existing surface texture measuring devices, such as roundness measuring devices, face challenges in continuously measuring surface roughness of cam faces with large eccentricity amounts due to limited displacement range of the stylus, leading to incomplete measurements and increased time for re-positioning, which results in measurement-impossible areas and adverse effects on measurement waveforms.
Innovation Solution
A surface texture measuring device is designed with a roughness detector featuring a skid at the tip, which includes a pair of skids sandwiching the stylus, and a slide mechanism with an urging member to ensure continuous contact with the measurement face, allowing for efficient measurement of cam faces with large eccentricity amounts by maintaining contact and preventing measurement-impossible areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a roundness measuring device with a limited displacement range stylus is used, then the device structure remains simple, but the measurement range becomes insufficient for cam faces with large eccentricity amounts
Solution Approach 1:
The skid is integrated into the detector main body structure, with the stylus positioned on the skid. This nesting approach allows the stylus to achieve a larger displacement range by utilizing the skid's movement along the cam face, while the overall detector structure remains compact and manageable.
Solution Approach 2:
The roughness detector is designed with a slide mechanism that allows dynamic adjustment of the stylus position. The urging member provides continuous contact force while allowing the stylus to follow the cam face profile dynamically, enabling measurement of large eccentricity amounts without increasing overall device complexity.
2Measurement precision
If the perimeter of the cam face is divided into sections for measurement, then the measurement precision can be maintained, but the measurement time increases significantly due to repeated re-positioning
Solution Approach 1:
The urging member continuously urges the skid to maintain contact with the cam face throughout the entire rotation. This continuous contact enables uninterrupted measurement of the entire cam face perimeter in one rotation, eliminating the need for repeated re-positioning and section-by-section measurement while maintaining measurement precision.
Solution Approach 2:
The roughness detector is preliminarily positioned with the skid and stylus in contact with the cam face before rotation begins. This preliminary setup ensures that the measurement can proceed continuously through the entire cam face perimeter without interruption or re-positioning, significantly reducing measurement time.
3Length of moving object
If the stylus displacement range is limited, then the roughness detector structure remains compact, but measurement-impossible areas occur on cam faces with large eccentricity amounts
Solution Approach 1:
The skid acts as an intermediary between the stylus and the cam face. It receives the contact force from the cam face and translates it into stylus displacement, enabling the stylus to measure surface roughness even when the cam face has large eccentricity amounts that would exceed the stylus's direct displacement range.
Solution Approach 2:
The slide mechanism with urging member dynamically adjusts the skid position to maintain continuous contact with the cam face throughout the entire perimeter. This dynamic adjustment ensures that no measurement-impossible areas occur, even on cam faces with large eccentricity amounts, while keeping the detector structure compact.
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 device enables continuous measurement of surface roughness and contour shape on cam faces with large eccentricity amounts, preventing measurement-impossible areas and maintaining accurate waveforms, thus enhancing measurement efficiency and reducing re-positioning time.
Implementation Method 1
an urging member configured to urge the slide member so that the skid always comes in contact with the measurement face of the measured substance
Data Source
AI summary
A surface texture measuring device includes a rotation driving device configured to rotate a measured substance, a roughness detector including a stylus provided displaceably at a tip of a detector main body and at least one skid provided at the tip of the detector main body and in the proximity of the stylus and outputting displacement of the stylus based on the skid as an electric signal, and a detector driving device configured to drive a detector holder. The detector holder includes a guide member driven by the detector driving device, a slide member configured to hold the roughness detector and provided slidably in a displacement direction of the stylus to the guide member, and an urging member configured to urge the slide member so that the skid always comes in contact with the measurement face of the measured substance.