China's precision measuring instruments need to be shortened and the international gap

The measuring instrument plays a decisive role in the precision instrument debugging room of the National Precision Tools Engineering Research Center. The staff taps the button, and the automotive gear fixed on a detection platform quickly rotates. On the computer screen next to it, the numbers jump quickly. In just over 10 seconds, the measurement results are displayed, along with measurement values ​​and allowable deviation values, making it clear at a glance. The deputy chief engineer of the research center Yu Gang just commented on this self-developed rapid detection sorter: “Because of the high detection speed, high degree of automation, and low price, it has met the needs of auto manufacturers to achieve 100% rapid detection of gears. This guarantees the quality and safety of the national automobile. The equipment fills the gap in the domestic automotive gear online detection and sorting technology field."

"Imagery metaphor, CNC tools are the teeth of CNC machine tools, precision measurement instruments are the eyes of CNC machine tools. They are mutually reinforcing, closely related to equipment, services, and promote the development of CNC manufacturing equipment, especially digital cutting technology." Chengdu Tools Research The equivalent of the senior engineer and doctoral tutor Xie Huayu.

Relevant statistics show that after decades of construction and development, China's measuring tool industry has initially formed an industrial system with relatively complete product categories, a certain production scale and development capabilities, and has become the world's second-largest producer nation with Japan. However, as the basis of CNC cutting technology, China's tool manufacturing industry still has a big gap with foreign advanced level in terms of technical level and performance quality of measuring instruments.

The country’s production has bright spots, from visual inspection to simple measurement to precision measurement, and advances in measurement technology have ensured progress in manufacturing technology to some extent. The famous scientist Mr. Qian Xuesen also pointed out: "Information technology includes measurement technology, computer technology and communication technology. Measurement technology is the key and foundation."

The person in charge of the China Machine Tool Industry Association told the reporter that precision machining requires not only the precision and stability of the machine tool, but also the accuracy of the tools and fixtures. It also requires precision measuring instruments to calibrate and measure. "Some of them are in the process of machining (such as the tool setting tool); others are after-the-fact detection (such as gear measuring instruments)."

According to industry experts, taking the wind power industry as an example, the machining and testing of typical components such as steam turbine blades, rotor wheel slots, and turbine rotor rotor slots in power generation equipment are representative and reflected to a certain degree. The state-of-the-art cutting technology and the latest achievements and levels of CNC cutting tools, digital measurement technologies and measuring instruments have attracted the attention of the tool manufacturing industry.

It is gratifying that domestic measuring tool manufacturers have invested heavily in the development of digital display technology and digital display products in recent years and have achieved tremendous results. Domestic digital display tools have evolved from the simple bar LCD digital display of previous years to the more complex image display of surface dynamic liquid crystal dynamic simulation. The resolution of the digital video scale grid has been developed from 0.01 millimeter to 0.001 millimeter, and the accuracy and reliability of measurement have been improved. Have a significant increase. The continuous improvement of the waterproof and dustproof performance (from IP54 to IP65, which can now reach IP67) also enhances the market competitiveness of domestic digital display measuring tools.

Harbin Measuring & Cutting Tools Group Co., Ltd. (hereinafter abbreviated as Harbin) has continuously strengthened its advantages in the field of development and manufacturing of precision instruments such as gear measuring instruments, surface roughness measuring instruments, and contour measuring instruments in the past 10 years. It has successfully developed the largest domestic 2 meters at present. CNC gear measuring instrument has become the most competitive precision measuring instrument manufacturer in China.

Luo Fu, director of the National Precision Tool Engineering Research Center and director of the Chengdu Tool Research Institute, said that so far, the center's achievements in new tool materials, tool material surface modification processes, and gear meters have been at the leading level in the country. Through unremitting efforts, it has now possessed the most advanced precision tool production equipment with independent intellectual property rights in China, and established an industrialization base, which has enabled China's precision tools to realize leap-forward development in terms of research and development, technological equipment and industrialization capabilities. The results have reached or reached the world advanced level.

The "double-frequency laser interferometer" is a core product independently developed by the center. Now only this center has the technology to produce this equipment. Its successful development has changed China's long-term dependence on imports in this field. Zhai Gang proudly said: "The instrument's multiple functions have broken the foreign technology blockade, detection resolution of 0.02 microns, detection length of up to 20 meters. The price is much lower than similar foreign products, in the international, this instrument can be With the United States and the United States and other countries in a similar product level!"

Although the three major areas still need to make efforts despite significant progress in many areas, people in the industry believe that the current status of China's precision measurement technologies and instruments is still far from meeting the rapid development of domestic machinery and equipment manufacturing industry, especially in advanced measurement technologies. The gap between basic theory research and instrumental key technology development of instruments and foreign countries is increasing.

Xie Huarong believes that the gap between China and foreign countries in terms of measuring instruments is greater than that of cutting tools, mainly reflected in the following three technical areas:

The first is the measurement technology and instrumentation of numerically-controlled machine tools, and in particular, the precision and performance of precision and dynamic numerical control machine tools represented by laser measurement systems, as well as precision compensation techniques. High-performance laser measurement system is mainly used for precision testing and evaluation of high-end numerical control equipment such as CNC machine tools and coordinate measuring machines. The domestic laser interferometry system developed and produced in China by the Chengdu Tool Research Institute has a certain gap compared with the advanced level in the world.

The second is CNC tool measurement technology and instrumentation, especially high-precision CNC tool measurement technology, CNC tool in-machine measurement technology and CNC tool preset measurement technology and instruments. Taking high-precision, automatic tool presetting measuring instrument series as an example, our country started late in development. In 2005, at Beijing Machine Tool Exhibition, there were only Harbin and Tianjin Tianmen debuted. The digital cutting tool with surface array CCD was exhibited. Pre-measurement meter prototype. In addition, domestic Tianjin Tianmen, Cheng Quan, etc. are all under development, but there is still a certain gap in technical level and quality.

The third is the on-line/on-line digital measurement technology and equipment applicable to production sites, especially on-machine measurement and feedback correction compensation technologies and devices for complex precision contour machining, such as CNC gear grinding machine-in-service measurement technologies and devices, turbine blades Online measurement techniques and devices.

Some experts in the industry have rethought pointed out that in the past, the professional research institutes in the machinery industry all went through the same business, which led to a reduction in the investment in technology development and the loss of technical personnel. This has adversely affected the development of the precision measurement instrument manufacturing industry. In this regard, Xie Huarong believes that relevant state departments should take measures as soon as possible to adopt policy tilts, increase investment in the “National Precision Tools Engineering and Technology Development Center”, and selectively, appropriately restore or form a limited number of non-profitable countries. The funded professional research institute focuses on the research and development of the national economy, national defense and military technology, and guides and promotes the improvement of the industry's technological level.