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Three coordinate measurement technology paper aBased on the three coordinate measuring instrument precision measurement technology research
Abstract: The appearance of the three coordinate measuring instrument itself is a big revolution in the measurement industry, it not only greatly improves the measurement accuracy, but also in the intelligence has a great deal of progress in the development of the measurement industry has a very deep impact. In order to further improve the product quality of China's gear industry, improve the competitiveness of the industry, this paper on the three coordinate measuring instrument precision measurement technology research, to explore the advantages and disadvantages of precision with other instruments and development trends, so as to ensure the quality of China's gear products.
Keywords: Coordinate Measuring Machine (CMM), Measurement Industry, Precision Measurement Technology
Classification Number: TH721 Literature Identifier: A Article Number: 1672-3791(2013)06(b)-0073-01
Coordinate Measuring Machine (CMM) is a high-efficiency measuring instrument developed in the late 1960s. CMM (Coordinate MeasurMahine) is a kind of high-efficiency, new and precise measuring equipment developed in the late 1960s, which is widely used in machinery manufacturing, electronics, automobile and aviation industries. Coordinate measuring machine can carry out parts size, shape and mutual position detection, can be used for scribing, centering holes, especially for continuous surface scanning to get surface data and expression. The acquisition of surface data is one of the basic and key technologies for the realization of product reverse engineering.
1 CMM on the role of the progress of the measurement industry
The rapid progress of the entire measurement as well as the machinery industry, and constantly to the CMM put forward a higher, newer, more requirements, such as the requirement for faster, more sensitive, better stability, less sample size, detection of micro-loss or even non-destructive, remote sensing telemetry telemetry telemetry more remote, more convenient to use, more cost-effective, No pollution, etc., but also for the development of CMM technology and industry to provide a strong impetus, and into the further development of instrumentation material, knowledge and technical basis.
1.1 solved the complex shape of the surface contour size measurement
The realization of the basic geometric elements of high-efficiency, high-precision measurement and evaluation, to solve the complex shape of the surface contour size measurement, such as the box parts of the aperture and hole position, blades and gears, automobiles and airplanes, such as the outside dimensions of the detection.
1.2 Improve the measurement accuracy
Improve the measurement accuracy of three-dimensional measurement, the current high-precision CMM single-axis accuracy per meter length up to 1 um, three-dimensional spatial accuracy of up to 1 ~ 2 um. For the workshop inspection of the CMM, per meter measurement accuracy of the single-axis up to 3 ~ 4 um. As the CMM can be used in conjunction with the numerical control machine tools and machining centers to form a production machining line or flexible processing center. As the CMM can be used with CNC machine tools and machining centers to form a production line or flexible manufacturing system, thus promoting the development of automatic production lines.
1.3 Improved measurement efficiency
With the continuous improvement of the accuracy of the CMM, the automation program continues to develop, promoting the progress of three-dimensional measurement technology, greatly improving the measurement efficiency. In particular, the introduction of electronic computers, not only to facilitate data processing, but also to complete the CNC control function, can shorten the measurement time of more than 95%.
1.4 Reduce user measurement costs
With the continuous maturation of laser scanning technology, while meeting the high precision measurement (quality inspection) and laser scanning (reverse engineering) multifunctional composite CMM development to better meet the needs of the user, greatly reducing the user measurement costs, improve work efficiency.
2 Coordinate Measuring Instrument compared with other instruments
2.1 Image Measuring Instrument
As the original precision measuring instrument, image measuring instrument is a witness to the entire industry began, it provides the basis for the development of industrial platform. However, because the image measuring instrument measurement technology is slightly rough, therefore, the secondary element imaging instrument has become the product of the era of industry development, it is precision measurement technology and functional aspects of the development of the industry to provide technical support. However, even so, the quadratic image measuring instrument has not fully meet the needs of customers inspection, it can not provide a solution for three-dimensional inspection, in this case, the development and production of the CMM. Of course, the emergence of 2.5$/m3 in the transition stage in this process in the manufacturer provided assistance. This is a whole stage of development of precision measuring instruments from the beginning to the present.
2.2 CMM
The CMM uses a granite meter base, which improves the accuracy of the reference plane and reduces the precision error of the instrument itself. The movable meter base can be measured at any position of the meter base. The meter base is not rusty and easy to use and store.
The measurement accuracy of the CMM is very high, the CMM and other measuring instruments compared to this point occupies a great advantage. For example, the manufacture of precision gauges, in general, is good, with vernier calipers horizontal measuring tools, measuring accuracy up to +/-0.1 level. However, the general level of the CMM, the measurement accuracy can be as high as +/-0.05.
Through the above analysis, we can see from the functional application of the secondary element and the CMM, compared to the secondary element of the image measuring instrument, the CMM can be said to be more versatile, because it is in addition to the measurement of the workpiece's length and width parameters, but also detect the workpiece's high, which is the image measuring machine Can not be reached.
3 CMM measurement technology development trend
3.1 More flexible and diverse varieties
In our country, people have become increasingly aware of the importance of measurement testing and appropriate measurement devices, not only can help users easily improve product quality, but also will improve production efficiency, so access to manufacturing advanced measurement equipment, can provide users with advanced Measurement solutions and get a high return on investment. China's mold future development will be a larger scale, high precision, the requirements will be more and more, multi-functional composite mold has become a hot spot. Improvement of plastic molds, the proportion of molds and molds adapted to high-pressure gas-assisted injection molding process will also be developed. Species diversity will change more rapidly, which requires in addition to accurate measurement of high precision, measurement equipment is also more flexible, and more need to be easy to measure the environment at any time to facilitate the transformation, so as to keep up with the pace of development.
3.2 Gradual development towards new application areas
? Market-oriented and customer-oriented? This trend has led to CMM technology now being widely used in industrial applications for the precise measurement of large machines and components, with large measuring ranges, high accuracy and great durability, ideal for factory environments. Widely recognized and affirmed worldwide as the industry's preferred CMM technology, will continue to develop new applications for measurement.
4 Conclusion
In summary, with the increasing scale of production, processing accuracy continues to improve, in addition to the need for high-precision CMM measurement room inspection, in order to facilitate direct inspection of the workpiece, measurement is often required to be carried out in the processing workshop, or the measuring machine is directly connected to the production line in series. The number of parts inspected increased, the degree of scientific management to strengthen, and therefore need a variety of precision CMM to meet the needs of production. With the continuous development and growth of the market, the three-dimensional yuan product technology is also constantly improving, three coordinate measurement technology is also progressing.
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