With the development of the mold manufacturing industry, the development of mold measurement technology is also in line. Different measurement techniques and different measuring equipment have emerged according to the different characteristics of mold making. From the digital mapping involved in the initial stage of mold design, to the measurement of mold processing, mold measurement, to mold acceptance measurement and later mold repair measurement; from small electronic molds to large molds in the automotive industry and large-scale aerospace industry. Mold measurement, high precision measurement equipment is everywhere. According to Luo Baihui, head of the International Association of Moulds and Hardware and Plastics Industry Suppliers, the measuring equipment used in mold quality testing not only includes the classic fixed high-precision coordinate measuring machine, but also because of the characteristics of mold manufacturing. On-site online measurement equipment, such as portable articulated arm measuring machines, high-efficiency white light measuring machines, large-size laser trackers and other measuring equipment, have also appeared in the field, through contact and non-contact measurement, image and laser scanning and photogrammetry and other detection techniques Meet the testing needs of mold products.
A typical mold company, in addition to the production and manufacture of molds, will involve the manufacture of some inspection tools, fixtures and general machine parts. In this case, the fixed measuring machine with high precision, strong function and good versatility has become the first choice measuring instrument for the quality inspection of most mold enterprises. Mold measurement covers a wide range, including model mapping, mold design, mold processing, mold acceptance, mold repair inspection, mold molding product batch inspection and many other fields. Each area requires high-precision dimensional measurements, including distance, angle, height, hole diameter, arc radius, surface and other geometric quantities, as well as roundness, straightness, flatness, verticality, parallelism, and coaxial Degree of geometric tolerance.
The requirements for measurement in various fields are also different. The most typical ones are batch testing of model mapping and mold forming products: model mapping involves comprehensive measurement of dimensions, low requirements for measurement efficiency, and high functional requirements for instruments; Batch testing of products requires very high measurement efficiency. The measurement requirements for the mold usually include the specified point measurement of the control surface, the diameter and position measurement of the assembly and positioning holes, and the profile of the measurement type and the profile line are often required. At this time, the high precision, automation and point-to-point contact measurement capability of the fixed measuring machine is extremely suitable. If the mold workpiece is required to be directly matched with the point cloud on the CAD model or the mold part is mapped, the fixed measuring machine can also achieve high efficiency by means of contact continuous scanning probe or non-contact laser scanning probe. High-density point cloud scanning measurements. It should be noted here that because of the difference in measurement structure and measurement principle, the accuracy of contact measurement is usually better than that of non-contact measurement. Luo Baihui pointed out that rapid response and rapid adjustment in recent years are the urgent development needs of mold companies. Through rapid mold manufacturing and delivery, the time to market can be shortened, and the company will gain valuable competitive opportunities. At the same time, the demand for large molds will continue to expand, and the online measurement and the on-site adjustment requirements of molds, fixtures and inspection tools will enable Portable measurement systems came into being.
Because of its portability and flexibility, the articulated arm coordinate measuring machine has gradually grown into one of the key measuring devices in the mold processing industry. The device can be used for on-line measurement in the workshop, is not affected by the environment, and is easy to install. It can even be installed directly into the large machine tool for on-machine measurement of the unsold mold. At the same time, the measuring arm is made of carbon material. Very light. When working, the operator can measure or map the workpiece with the measuring arm. The measuring direction can be adjusted at any time like a human arm, which largely avoids the existence of dead angles. Therefore, the portable articulated arm measuring machine is one of the most efficient measuring devices for mapping or measuring molds, especially for non-bulk single-piece measuring or mapping tasks.
With the continuous innovation and development of measurement technology, advanced measurement technology is not only reflected in the measurement room and manufacturing site, but also innovatively applied to machine tools and processing equipment. This is the on-machine measurement system we are talking about. As an effective process control method, on-machine measurement technology provides real-time processing quality feedback for machine tool operators, avoiding unnecessary machining errors and significantly improving the manufacturing efficiency of molds, especially large molds. The on-machine measurement system includes a workpiece-on-machine measurement system and a tool-on-machine measurement system.
Image measuring instrument is an emerging precision geometric measuring 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 measuring head to collect the image of the workpiece, and extracts the coordinate points of the surface of various complex shapes by digital image processing technology, and then converts into various geometric elements in the coordinate measuring space by coordinate transformation and data processing technology. Thereby, the actual size, shape and mutual positional relationship of the workpiece to be tested are calculated.
Through continuous development, the scope of application of image measuring instruments has been expanded to accurately measure various complex workpiece contours and surface shapes. Now, the measuring objects of the image measuring instrument include electronic parts, precision molds, stamping parts, PCB boards, threads, gears, forming tools and other workpieces, and gradually enter the electronics, machinery, instruments, watches, light industry, national defense, Aerospace and other industries have become the precision measuring instruments commonly used in laboratories, measuring rooms and production workshops of universities, research institutes and metrology institutes.
According to Luo Baihui's investigation, at present, China has already possessed cutting-edge technological achievements in the four fields of machine, light, electricity and computing, integrating technological innovations in various fields and disciplines, and has achieved import substitution in technical indicators and product quality. The image measuring instrument industry is at the international advanced level. The high-performance, high-precision VM series image measuring instrument combines with the powerful Vispec special measuring software to solve the measurement requirements of precision molds, and can tailor the products to meet their specific needs, with local advantages.
Traditional contact three-coordinate measuring machines, articulated arm measuring machines, large-size laser trackers and other instruments have a wide range of applications in the field of mold measurement, but in the face of fine structure, thin-walled parts, small injection molded parts, rapid batch measurement, etc. There are no good solutions to the problem. With the characteristics of CCD area array sensor and non-contact measurement, the image measuring instrument can effectively complete the workpieces that cannot be contacted, deformed and have a small shape, which has an absolute advantage.
Tianzhun VMU432 image measuring instrument
When mapping molds in the field of reverse engineering, fast scanning of the surface requires the use of expensive scanning probes or laser scanning probes. The Sky Imager has an automatic contour sweep function that captures coordinates of all points on the same contour to obtain a contour map of the workpiece. The automatic contour scanning function is simple and efficient, and the operator only needs to specify the scanning start and end positions. The machine will automatically search the scanning direction, move the table, acquire the point set coordinates, and quickly get the contour of the workpiece. An economical and efficient solution.
For molds with fine structure and small size, the traditional contact three-coordinate is limited by the size of the probe, the measurement operation is difficult, and the measurement efficiency is even impossible to measure. With the Tianguan Image Measuring Instrument, using a magnification of up to 163 times, the nuances of the mold can be clearly observed, making it easy to achieve accurate measurements. If you need to measure a more subtle structure, you can increase the magnification by adding an objective lens, and get a magnification of up to 326 times to ensure that all the details are at a glance.
Molded parts are characterized by a large number and high measurement efficiency. Although the traditional contact type three coordinates have automatic measurement functions, the efficiency is far from meeting the requirements of batch measurement. The image measuring instrument adopts CCD to acquire images for measurement. The CCD belongs to the area array sensor, and can acquire images of one region in one imaging. Through high-speed image processing algorithm, all geometric quantities in the region can be measured in an instant. The measurement efficiency is much higher than that of the contact three-coordinate measuring machine. With the functions of primitive copying, multi-station system, and report custom output, you can quickly build measurement programs and efficiently acquire the required data.
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