Measuring instrument, image, mold_application of image measuring instrument in mold field

The image measuring instrument is a new type of precision geometric measurement instrument. With the development of technology, it has become one of the most commonly used measuring instruments for precision geometric measurement. The image measuring instrument uses the image probe to collect the image of the workpiece, extracts the coordinate points on the surface of the workpiece with various complex shapes through digital image processing technology, and then converts it into various geometric elements in the coordinate measurement space by using coordinate transformation and data processing technology. So as to calculate the actual size, shape and mutual positional relationship of the workpiece to be measured. After continuous development, the application range of image measuring instruments has been continuously expanded, which can accurately measure the contours and surface shapes of various complex workpieces. At present, the measurement objects of the image measuring instrument include electronic parts, precision molds, stamping parts, PCB boards, threads, gears, forming tools, etc., and gradually enter the electronics, machinery, instruments, clocks, light industry, national defense and military industry, Aerospace aviation and other industries have become precision measuring instruments commonly used in the laboratories, measurement rooms and production workshops of universities, research institutes, and measurement technology institutions. Mold measurement involves a wide range of fields, including model surveying and mapping, mold design, mold processing, mold acceptance, inspection after mold repair, and batch inspection of mold forming products. Every field requires high-precision size measurement, including distance, angle, height, hole diameter, arc radius, curved surface and other geometric quantities, as well as roundness, straightness, flatness, perpendicularity, parallelism, coaxiality Degrees and other geometric tolerances. On the other hand, the measurement requirements of various fields are also different. The most typical is the model surveying and the batch inspection of mold forming products: the model surveying and mapping involves the overall measurement of the size, and the measurement efficiency is not high, and the functional requirements of the instrument are very high. High; batch inspection of molded products requires very high measurement efficiency. Traditional contact three-coordinate measuring machine, articulated arm measuring machine, large-size laser tracker and other instruments have a wide range of applications in the field of mold measurement, but they are faced with fine structures, thin-walled workpieces, small injection molded parts, rapid batch measurement, etc. When there is a problem, there is no good solution. With the characteristics of CCD area sensor and non-contact measurement, the image measuring instrument can efficiently complete the workpiece that cannot be contacted, easily deformed, and has a small shape, which has absolute advantages. When surveying molds in the field of reverse engineering, for fast scanning of curved surfaces, expensive scanning probes or laser scanning probes are required. The image measuring instrument has an automatic contour scanning function, which can obtain the coordinates of all points on the same contour, so as to obtain the contour map of the workpiece. The automatic contour scanning function is simple to operate and highly efficient. As long as the operator specifies the scanning start and end positions, the machine will automatically search for the scanning direction, move the worktable, and obtain the coordinates of the point set, so as to quickly obtain the contour of the workpiece. An economical and efficient solution. For the mold with fine structure and small size, the traditional contact type three-coordinate is limited by the size of the probe, the measurement operation is difficult, and the measurement efficiency is even impossible to measure at all. With the help of the image measuring instrument, the magnification of up to 163 times can be used to clearly observe the subtleties of the mold, which facilitates accurate measurement. If you need to measure finer structures, you can increase the magnification by adding an objective lens to obtain a magnification of up to 326 times, ensuring that all the details are at a glance. The characteristics of the molded parts are huge quantity and high measurement efficiency requirements. Although the traditional contact three-coordinate has the automatic measurement function, the efficiency is far from meeting the requirements of batch measurement. The image measuring instrument uses CCD to obtain images for measurement. CCD is an area-array sensor, which can obtain images of a region at a time. Through high-speed image processing algorithms, the measurement of all geometric quantities in the region can be completed in an instant. The measurement efficiency is much higher than that of the contact three-coordinate measuring machine. With its advantages of non-contact, high efficiency, and high cost performance, the image measuring instrument has increasingly become an important measurement tool in the mold industry.