High precision roughness profile measuring machine

     The surface roughness profiler uses a contour centerline as the evaluation benchmark, and evaluates the surface quality with the help of six evaluation parameters: the arithmetic mean deviation of the contour Ra, the ten point height of the low light level unevenness Rz, the maximum height of the contour Ry, the average spacing of the micro unevenness of the contour Sm, the average spacing of the single peak of the contour S, and the contour support length ratio tp, and finally obtains the required surface roughness testing instrument

     The measuring principle of this instrument is the rectangular coordinate measurement method, that is, the coordinate points of the surface profile of the parts to be measured are mapped through the X axis and Z1 axis sensors, and the coordinate point data measured by the sensor is transmitted to the upper PC through the electrical components. The software performs mathematical operation on the original coordinate data collected, and marks the required engineering measurement items.

     The performance of this instrument can be compared with that of imported instruments, and its indicators have reached international standards. The instrument meets the requirements of national standards GB/T3505-2000, GB/T6062-2001, GB/T10610-1998, and international standards ISO5436, ISO11562, ISO4287

The roughness profiler is a contact measurement, which is measured by the slippage between the instrument stylus and the measured surface. Its main advantage is that it can directly measure the surface roughness of some parts that are difficult to measure, such as holes, grooves, etc., and can directly read or draw the shape of the surface contour curve according to certain evaluation standards, with fast measurement speed, reliable results and convenient operation. However, the measured surface is easy to be scratched by the stylus, so the measuring pressure shall be reduced as much as possible on the premise of ensuring reliable contact.

Roughness profilers are divided into inductive, inductive and piezoelectric types according to the working principle of sensors. The instrument is composed of three basic parts: sensor, drive box and electrical box.

The stylus of the sensor is made of diamond, the arc radius of the stylus tip is 2 microns, and the rear end of the stylus is inlaid with a guide block to form a measurement benchmark relative to the macroscopic fluctuation of the workpiece surface, so that the displacement of the stylus is only relative to the sensor housing, so the guide block can eliminate the macroscopic shape error and reduce the influence of ripple on the surface roughness measurement results. The sensor is connected with the drive box in the form of hinge, which can fall freely, so as to ensure that the guide block always contacts the measured surface.