Analysis Of The Surface Roughness Measuring Based On The Virtual Instrument

In the field of mechanical design and manufacture, surface roughness has been exerting tremendous influence to the properties and service life of the surface of the part. In order to guaranteeing the qualities, functions and the service life of products, to measure and control the roughness of surface accurately are very necessary. But, ever-improving modern precise manufacturing process quality of surfaces demands high precision and velocity of surface roughness measurement. Therefore, it is very necessary to develop a new type of surface roughness measuring instrument which owns characteristics of large range, high precision and multi-parameters is quite imperative.Based on the traditional surface roughness measuring instrument, this subject has been designed a new instrument based on the software of virtual instrument LabVIEW. It could not only solve all the problems exist in the traditional instrument at present, but also have advantages such as quick survey speed, high automaticity, good man-machine contact surface etc. And it will have the bigger market potential and the application value because of cheap price and strong versatility.In this article the main research contents are as follows: First, the overall structure of surface roughness measuring instrument is designed according to the characteristic of this instrument which includes software system design and hardware system design. Second, provides the software controlling program according to the definition and algorithm of the parameters of surface roughness. Third, the hardware structure part of the surface roughness measuring instrument based on the virtual instrument mainly designs the sensor lateral driving circuit, including the sensor's motion direction controlling circuit, the route measuring circuit, position limiting circuit etc. The forth, Analyzed the origin of measuring error from every aspects, include sensor error, sensor signal adjusting circuit error, the data acquisition system error etc. The fifth, through analyzes the measured result which is surveyed by this instrument, we could confirm the feasibility of this instrument surveyed. And make an introduction of how to eliminate or compensate these errors.