The conditions for improving production efficiency and its relationship with measurement engineering are mainly reflected in three aspects, namely, shortening the delivery date, improving product quality and reducing processing costs. This article takes this as an entry point and introduces the development trend of measurement technology in conjunction with the gauge exhibits at the 20th Japan International Machine Tool Show.
Trends in measurement technology
In the past ten years, the progress of high-speed machine tools has been extremely rapid. From the field of measurement, some measuring instruments have made significant progress in high-speed and automation. However, from the perspective of the whole industry, the progress of high-speed measuring instruments lags far behind the machine tool industry, which often results in between processes. unbalanced. Increasing the measurement efficiency and strengthening the connection with other processes to make the flow of goods smooth, is the main issue of shortening the delivery date. Under this premise, looking at the measuring instrument products of this exhibition, we can find that many manufacturers have introduced different products that improve the detection speed, improve the operation performance and diversify the functions. Their common features are to improve the measurement efficiency, many New technologies are also developed around this center.
In order to improve product quality, companies are actively developing high-precision measurement techniques with high reliability. In recent years, with the implementation of ISO9000s and ISO9000 standards, the improvement of the measurement instrument management system is imminent. Unfortunately, there are not many related calibration instruments or standard instruments at this exhibition. At the meeting, some new measurement technologies and key improvement technologies were exhibited. It can be seen that companies are still positive about technological innovation. Both the user and the manufacturer attach great importance to the maintenance of the instrument. Some of the exhibited measuring instruments are not as harsh as the temperature conditions of the installation site, and some instruments combine the functions of various measuring tools. These new products show that manufacturers are also spared no effort in developing cost-reducing measuring instruments.
Measurement technique for improving efficiency
Non-contact high speed shape measurement technology
The shape measurement of large parts such as automobile bodies or pump impellers requires the use of high-speed means for obtaining three-dimensional position data. Up to now, the measurement has been mainly carried out using a coordinate measuring machine with a multi-joint or horizontal cantilever type contact probe. However, the contact measurement method will be subject to many limitations when measuring large parts, which is not conducive to improving measurement efficiency. In response to this situation, a variety of non-contact measurement methods have been exhibited at this exhibition to enable high-density and high-speed measurement of the above-mentioned large parts.
Tokyo Precision Co., Ltd. has developed a new type of coordinate measuring machine, which is a movable three-dimensional optical measuring device that performs non-contact measurement using interference fringe images and triangulation. There are three cameras in the machine, which can scan the object position coordinates in the 220mm (longitudinal) × 330mm (horizontal) field of view with a density of 4 points/mm2 per second. The calculation can be completed in 30~40 seconds. Measurement accuracy It is 60?m. The machine utilizes a new type of data processing technology, for example, measuring the data of a car door corresponding to 1000mm × 1500mm at a pitch of 0.5mm, including the measurement process, a total of only 40 minutes to complete the measurement operation, and the data Perform analytical processing.
The Comet system exhibited by Tokyo Trade Engineering Systems Co., Ltd. is also a movable non-contact CMM. Although it also uses the principle of triangulation, it can rotate the grating stripe as a measurement index to obtain multiple etc. High line data. This measurement method is not easily affected by the surface state of the object to be measured, and high measurement accuracy can be obtained.
Since the above system can acquire three-dimensional position data on the unit surface, it is possible to perform high-speed detection work as compared with the contact type measurement method. In addition, since non-contact measurement does not increase the measurement force, high-precision measurement of soft materials is possible. The data obtained by such systems can be evaluated against CAD data. Therefore, companies must design processes and related application examples to publicly explain to users.