Roughness tester is also called surface roughness tester, surface smoothness tester, surface roughness tester, roughness tester, roughness tester, roughness tester and other names. It was first developed and produced abroad before it was introduced into China. When the roughness meter measures the surface roughness of the workpiece, the sensor is placed on the measured surface of the workpiece. The drive mechanism inside the instrument drives the sensor to slide along the measured surface at a constant speed. The sensor feels the roughness of the measured surface through the built-in sharp stylus At this time, the roughness of the measured surface of the workpiece causes the displacement of the stylus. This displacement changes the inductance of the sensor inductance coil, thereby generating an analog signal proportional to the measured surface roughness at the output of the phase-sensitive rectifier. The signal enters the data acquisition system after amplification and level conversion. Introduction Roughness tester is also called surface roughness tester, surface smoothness tester, surface roughness tester, roughness tester, roughness tester, roughness tester and many other names. It has the characteristics of high measurement accuracy, wide measurement range, easy operation, easy portability, and stable work. It can be widely used in the detection of various metal and non-metal processing surfaces. The instrument is a compact instrument with integrated sensor host. Hand-held features are more suitable for use on the production site. The shape adopts aluminum die design, which is sturdy and durable, and has obvious anti-electromagnetic interference ability, which is in line with the new design trend of today. Application field The application fields of the roughness meter are as follows: 1. Mechanical processing and manufacturing, mainly metal processing and manufacturing. The roughness meter was originally produced to detect the surface roughness of machined parts. In particular, the stylus-type roughness measuring instrument is more suitable for the detection of harder metal surfaces. Such as: auto parts processing manufacturing industry, mechanical parts processing manufacturing industry and so on. As long as the surface quality of the workpiece is involved in these processing and manufacturing industries, it is essential for the detection application of the roughness meter. Shanghai Quanaifeng Precision Measuring Instrument Co., Ltd. is a professional company that professionally represents MITUTOYO Mitutoyo measuring tools and measuring instruments in Japan and SK gauges in Japan. 2. Non-metal processing manufacturing industry, with the advancement and development of science and technology, more and more new materials are applied to the processing technology, such as ceramics, plastics, polyethylene, etc., some existing bearings are made of special ceramic materials Yes, there are pumps and valves made of polyethylene. These materials are hard in texture, and some applications can replace metal materials to make workpieces, and their surface roughness needs to be checked during the production process. 3. With the continuous strengthening and improvement of the technology and functions of the roughness meter, as well as in-depth promotion and application, more and more industries have been found to require roughness detection. In addition to mechanical processing and manufacturing, power, communications, electronics, For example, couplings on switchboards, integrated circuit semiconductors and other manufacturing processes also require roughness assessment. Even the surface of stationery, tableware, and human teeth used in people's lives must be tested for surface roughness. working principle Needle tracing method is also called stylus method. When the stylus is gently swiped directly on the measured surface of the workpiece, due to the fluctuation of the contour of the measured surface, the stylus will move up and down in the direction perpendicular to the surface of the measured contour. This movement is applied to the signal through the electronic device. Zoom in, and then output the data or graph about roughness through a zero-meter or other output device. The surface roughness measuring instrument adopting the principle of needle tracing is composed of a sensor, a driver, a zero indicator, a recorder and an inductance sensor. It is one of the main components of the profilometer. Its working principle is shown in Figure 2. A diamond touch is installed at one end of the sensor rod Needle, stylus tip curvature Roughness Tester The radius r is very small. During measurement, the stylus is placed on the workpiece, and it is in vertical contact with the surface to be measured. The driver is used to drag the sensor at a certain speed. As the peaks and valleys of the contour of the measured surface fluctuate, the touch will move up and down when the measured surface glides. This movement causes the magnetic core to move up and down synchronously through the fulcrum, so that the inductances of the two differential inductor coils surrounding the magnetic core change. Figure 3 is the main block diagram of the working principle of the instrument. The coil of the sensor and the measurement circuit are directly connected to the balanced bridge. The change in the inductance of the coil makes the bridge unbalanced, so it outputs a signal proportional to the displacement of the stylus up and down. After the change is amplified and phase-sensitive detection, a signal that can indicate the magnitude and direction of the displacement of the stylus is obtained. After that, the signal is divided into three channels: one is added to the zero indicator to indicate the position of the contact pin, the other is transmitted to the DC power amplifier, and the recorder is pushed to record after the amplification; the other is amplified by the filter and the average meter amplifier, and then enters Integral calculator, integral calculation, you can directly read the surface roughness Ra value from the indicator table. Figure 3 Block diagram of the working principle of the traditional surface roughness measuring instrument. The function of the zero meter reflects the position of the iron core in the differential inductance coil. When the iron core is in the middle position of the differential inductance coil, the pointer of the zero indicator indicates the zero position, that is, it is guaranteed to be within the linear range of the inductance change. Therefore, before measuring, the zero indicator must be adjusted so that it is at the zero position. After noise filtering and waviness filtering, all that remains is a signal proportional to the roughness of the measured surface, and then after passing through the average table amplifier, the output current I and the measured surface contour deviate from the centerline at a height y absolute The value is proportional to the product calculated by the integrator to obtain the Ra value, which is displayed by the zero indicator. This instrument is suitable for measuring the Ra value of 0.02-10μm. Among them, a few models can also measure smaller parameter values. The instrument is equipped with various accessories to adapt to flat, inner and outer cylindrical surfaces, conical surfaces, spherical surfaces, curved surfaces, And the measurement of the surface of the workpiece with small holes and grooves. The measurement is quick and convenient, and the measurement accuracy is high. The traditional surface roughness measuring instrument has the following shortcomings: (1) There are few measurement parameters, generally only a small number of parameters such as Ra, Rz, Ry can be measured; (2) The measurement accuracy is low, the measurement range is small, and the range of Ra value is generally about 0.02-10μm; (3) Measurement The method is not flexible, for example: the selection of the evaluation length, the selection of the filter, etc .; (4) The output of the measurement result is not intuitive. The main reasons for the deficiencies in the above aspects are: the reliability of the system is not high, the error of the analog signal is large and it is not easy to deal with. 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