The need for advanced manufacturing technology, various engineering projects and scientific experiments has also continually put forward new and higher requirements for CMMs. From the current development of CMMs at home and abroad, and the requirements of technology and production for CMMs, in the coming period, its main development trends can be summarized as follows.
(1) Popular high-speed measurement
Quality and efficiency have always been the two main indicators for measuring the performance of various machines and the pros and cons of the production process. The traditional concept is to ensure measurement accuracy, and the measurement speed should not be too high. As the production rhythm continues to accelerate, users are demanding more and higher requirements for the measurement speed of CMM while requiring the measuring machine to ensure measurement accuracy. The purpose of improving the measuring speed of the measuring machine will bring the following aspects of innovation to the CMM. The structural design of the measuring machine is improved and the material is changed. The structure is optimized to improve the rigidity and reduce the quality of the moving parts. The lightweight material is used to reduce the inertia of the motion, that is, the conventional material such as granite is converted into the density and the Young's modulus. Materials with a low ratio, thin-walled hollow structures, etc. Aluminum, ceramics, and synthetic materials have gained more and more applications in measuring machines; high-speed dynamic performance requires improved dynamic compensation, and dynamic errors are related to the structural parameters and motion specifications of the measuring machine. On the basis of studying these characteristics, it can not only improve the structural design of the measuring machine, improve the performance of the control system, but also perform dynamic error compensation, ensuring high precision while achieving high-speed measurement; using non-contact probe measurement method, in touch In the case of measurement, since the contact speed between the workpiece and the probe is not too large, this imposes a great limitation on the measurement speed. Although the scanning measurement method is much more efficient than the point measurement method, it is still limited by the touch measurement. The non-contact probe can avoid frequent acceleration, deceleration, collision, etc., and greatly improve the measurement speed. Especially from the higher requirements for reliability and security protection, non-contact probes also have great advantages; offline programming technology has become a trend, the so-called offline programming technology is assisted by programming technology, not In the case of the upper measuring machine, the preparation of the measuring program is completed in the environment of the three-dimensional graphics. This not only can effectively improve the actual use efficiency of the measuring machine, but also improve the efficiency of the measurement program. The application of offline programming technology allows us to fully prepare for the measurement in parallel with the production preparation and production process, thus saving valuable measuring machine time.
(2) Application of new materials and new technologies
In order to ensure reliable and high-speed measurement functions, foreign countries attach great importance to the selection of raw materials for the body. Recently, new materials such as alloys, stone materials and ceramics have been added on the basis of traditional cast iron and cast steel. Most of the world's major CMM manufacturers, such as Zeiss, Sheffield, Leitz, Ferranti (UK), and DEA, use lightweight, rigid, and thermally conductive alloy materials to make moving mechanism components on the measuring machine. Aluminum alloys, ceramic materials and various synthetic materials have been used more and more widely in coordinate measuring machines. Due to the good thermal conductivity of the new material, when the temperature distribution is uneven, the thermal stability can be quickly achieved in a very short time, and the thermal deformation caused by the temperature change is minimized. To this end, in recent years, it has caused the climax of the manufacturers to change, and new varieties emerge one after another. The advancement of technical indicators is manifested in two aspects: a. The maximum movement speed is above 15m/s; b. The ambient temperature requirement can be reduced to 20+_4.
Other new technologies, such as magnetic levitation technology, are also used in measuring machines and other probes.
(3) Improvement of control system
In modern manufacturing systems, the purpose of measurement is increasingly limited to the acceptance inspection of finished products, but to provide information about the manufacturing process to the entire manufacturing system, providing a basis for control. From this requirement, the measuring machine must be required to have an open control system with greater flexibility. To this end, we should make full use of the rapid development of new electronic industry technology, especially computers, to design new high-performance. In recent years, computer prices have been decreasing, and performance is getting better and better. If you can design a dedicated measuring machine digital control system with inexpensive and high-performance computer templates (such as 80386, 80486), you can introduce a new inexpensive and high-performance measuring machine control system. In addition, a compact control system can be used for compact design to reduce costs.
(4) Development of measuring machine probe
In addition to the mechanical body, the coordinate measuring machine is the key to the high precision of the measuring machine and the core of the coordinate measuring machine. Compared with other technical indicators, it is the most difficult to improve the performance of the probe. The most important performance indicator of an ideal probe is the parameter of the probe's ability to approach the part: under the same accuracy index, the aspect ratio of the probe body diameter D at the end of the probe to the length L of the spindle is D/L. The larger the value, the better the performance.
In addition, another important trend in measuring machine probes is that non-contact probes will find wide application. There are many two-dimensional patterns in the microelectronics industry, such as large scale integrated circuit masks, which are not measurable with contact probes. In recent years, foreign optical coordinate measuring machines have developed very rapidly. The core of an optical coordinate measuring machine is non-contact measurement. Simultaneously with the development of non-contact probes, analog probes with high precision, large range, for scanning measurements, and special probes that can be inserted into small holes for measuring micro-parts will also be developed. The simultaneous use or alternating use of different types of probes is also an important development direction.
(5) Innovation of software technology
The function of the measuring machine is mainly determined by software. The convenience of the operation and use of the CMM depends on the software. The development of each new technology of the measuring machine must be accompanied by the corresponding software technology. In order to incorporate the CMM into the production line, it is necessary to develop software for network communication, modeling, CAD, and reverse engineering; fitting, modeling, and various simulation softwares based on spline functions, NURBS, etc. are also evolving. In addition, the popularization of universal measurement software (DMIS) is facilitated to facilitate data exchange with CAD/CAM; at the same time, the development and use of dedicated measurement software for different types of workpieces is improved, and the measurement software family developed based on the same platform has also become An inevitable trend in software innovation.
It can be said that the measuring machine software is the fastest growing technology in the coordinate measuring machine. The development of software will make the coordinate measuring machine develop in the direction of intelligence. It will at least include automatic programming, optimization of measuring machine according to measurement tasks, automatic fault diagnosis and so on.
Asphalt Cutter Heads Milling,High Asphalt Milling Picks Road Bits,Asphalt Cutter Heads Milling Picks Road Bits,Rock Drill Dth Hammer Button Bits
Zhenjiang Weir Machinery Technology Co., Ltd , https://www.weircutterheads.com