Electronic Plug Gauge for Basic Theory of Measurement

1. In order to meet the needs of the development of factories, more and more electronic gauges are used in modern geometric measurement, because they are more suitable for the requirements of high-speed, high-precision and high-reliability quality control. The electronic gauge can not only display the measured geometry directly in analog mode and digital mode, but also calculate, display, print, store and carry out various kinds of analysis and statistics by computer to meet the requirements of quality control. * Electronic caliper and plug gauge are the most basic of electronic gauge. The former is generally used to measure shaft parts, and the latter is used to measure hole parts. It should be pointed out that the calipers and plug gauges mentioned here are not universal measuring tools for measuring axes and holes in the usual sense. They are fast measuring tools with high efficiency, high precision and high reliability.
2. Principle and Characteristic Principle Structure 1 Electronic plug gauge is composed of electronic plug gauge body and electronic amplifier. The sensor of electronic plug gauge is usually based on the principle of open differential transformer. This structure is characterized by wide measuring range and up to (1-2) mm. The electronic plug gauge body consists of a race gauge body, a special guide sleeve and a cemented carbide side head. The electronic amplifier matched with plug gauge usually consists of analog amplifier circuit and phase sensitive detector. Feature 2 Electronic plug gauge has high accuracy, comprehensive measurement error less than 1 co-m, stable, reliable and durable. It can be used for a long time under normal temperature conditions in production workshop. It can completely replace the three-claw internal diameter micrometer and internal diameter meter of the plug gauge, and can quickly and conveniently measure the diameter, ellipse and taper of the through hole. The electronic plug gauge adopts two cemented carbide side heads for contact measurement, with small force measurement and good wear resistance. The probe installation has self-locking function and is easy to install and adjust. Generally, special guide sleeve is designed according to user's requirements. The special guide sleeve guarantees the clearance, orientation and centering of measurement, so the measurement result of aperture is accurate, objective and fast.
3. Examples and the use of electronic plug gauge 1. Choose pictures from the gallery, use 2 electronic plug gauge to clean calibration parts and probes before use, use size calibration parts to calibrate, use median calibration parts to calibrate zero, and check the display value to be consistent with the calibration value and the calibration zero value to measure the workpiece.
4. The main error analysis electronic plug gauge has high accuracy, and the comprehensive measurement error is less than 1 micron. The main error sources are eccentricity error, inclination error and roughness error. When eccentricity error 1 is measured, the electronic plug gauge probe should be in the direction of the guide sleeve diameter. If the guide sleeve diameter deviates from the axis direction of the probe, the measurement is chord, not the diameter of the workpiece. The guide sleeve can be inserted into the hole of standard parts by selecting pictures from the gallery as shown in the figure. The guide sleeve can be moved back and forth in the horizontal direction, requiring the reading value of the instrument to change less than 1 micron. When the inclination error 2 is measured, if the axis of the plug gauge is inclined, it will remain on the plane determined by the axis of the hole and the axis of the connecting probe, but it will measure the long axis of the ellipse, not the diameter of the hole. The error can be reduced by reasonably controlling the gap between the guide sleeve and the workpiece and choosing the correct reading position. Choosing pictures from the gallery does not think that increasing the horizontal force can reduce the error caused by roughness. 3. To ensure that the measurement error is less than 1um, it depends on the correct choice of the curvature radius of the probe. Pneumometer is a kind of non-contact precision size comparison measuring instrument. It can provide users with optimized workflow, reduce maintenance time and improve production efficiency. It can ideally measure deviations within 0.0005 inches (0.127 mm). When measuring small tolerances, the measurement resolution of the pneumometer can reach 0.000002 inches (0,05um). In addition, because of non-contact measurement, this kind of equipment can measure all kinds of low hardness, high gloss, thin wall or other special material parts pneumometer's biggest advantage is easy to use, even if an inexperienced operator, can also use pneumometer for accurate measurement. The operation process is as simple as putting a ruler on the workpiece and reading it. Fast, accurate, economical and practical is also an important feature of pneumatic momentum meter. As long as the basic measuring system is purchased and the related low-cost auxiliary measuring tools are used, various measuring applications can be realized. Pneumometer can effectively measure various common dimensions, especially suitable for measuring shape and position relations and coordination tolerances. Compressed air used by most pneumometers in measurement can remove the remaining grinding particles or coolants on the workpiece under test, so the use of pneumometer can reduce the cleaning process of parts to a certain extent. 。 Because the pneumometer itself has no movable parts, it is basically immune to dirt. Combined with the above advantages, the start-up measurement has been and will continue to be a fast and effective measurement method. The principle of pneumatic measurement technology is that air flow and pressure are used to measure the size of the workpiece. In order to achieve precise measurement, the pneumometer uses a physical principle: the flow and pressure are proportional to the size of the gap, while the pressure and flow are inversely proportional to each other. The air flow after pressure regulation passes through the regulating valve-needle valve, or the regulating valve with ruby damper hole, and then reaches the nozzle. If the nozzle hole is opposite to the atmosphere, the maximum flow passes through the nozzle hole. At this time, there is a minimum pressure between the regulating valve and the nozzle, which we call "back pressure". When we make an obstacle close to the nozzle hole from far to near, it ejects.