Bicycle electric toothbrush electronic lock gearbox
Electronic products: intelligent direct driving electronic lock gearbox, automatic hair curler gearbox, intelligent mouse (Microsoft) gearbox, intelligent electric toothbrush gearbox, headphone take-up module gearbox, smartphone photo printer (Samsung) gearbox, small Q robot overall solution (Tencent qrobot robot gearbox), oppo N3 electric rotating camera, etc.
The traditional machining method (common machining) is the same as the precision and ultra precision machining methods. With the adoption of new technology, new technology, new equipment, new testing technology and instruments, the machining accuracy is constantly improving.
The continuous improvement of machining accuracy reflects the development trend of material segmentation level from macro to micro world. With the development of time, it is relatively easy to achieve the machining accuracy that was originally thought to be difficult. Therefore, general machining, precision machining and ultra precision machining are only relative concepts, and the boundaries between them change with time. Diamond cutting is the typical representative of precision machining and ultra precision machining.
Take diamond cutting for example. The arc radius of its cutting edge has been developing in a smaller direction. Because its size has a direct impact on the roughness of the surface to be machined, which is directly related to the reflectivity of the optical mirror, the reflectivity of the instrument and equipment is required to be higher and higher. For example, the reflectivity of the laser gyro mirror has been proposed to reach 99.99%, which requires the diamond tool to be sharper. In order to carry out the experiment of cutting very thin, the aim is to reach the thickness nm of the chip, and the radius of the cutting edge arc should approach 2.4nm. In order to achieve this height, the diamond grinder has changed the traditional structure. The spindle bearing is supported by air bearing, and the end face run out of the grinding disk can be corrected on the machine tool, so that the end face run out is controlled below 0.5 μ M.
In the aspect of cutting tools, diamond grinding wheel is used to control the back draft and feed. In the ultra precision grinding machine, grinding can be carried out in a ductile way, that is, nano grinding. Even the surface of glass can obtain optical mirror. From the perspective of long-term development, manufacturing technology is the main direction and strategic decision-making for the development of national economy of all countries in the world, one of the important means for a country's economic development, and also a long-term plan for a country's independence, prosperity, sustained and stable economic development, and leading in Science and technology. The development of science and technology also puts forward higher requirements for precision machining and ultra precision machining technology. From the lens of astronomical telescope to the micro and nano size parts of micro engineering and micro machinery required by the linewidth μ m of large-scale integrated circuit, the maximum size accuracy of the parts, regardless of the size, tends to be nano; the shape of the parts is becoming increasingly complex, and various aspheric surfaces are very typical geometric shapes at present. Micromachining technology brings a new trend for ultra precision manufacturing technology. Its micro degree makes the traditional manufacturing technology face a new challenge, promotes the improvement of technical performance of various products, and the development process presents a spiral cycle development, which directly contributes to the progress of science and technology and human civilization. The pursuit of high quality, miniaturization, high reliability and high performance of products has made the ultra precision machining technology develop rapidly and become an important part of modern manufacturing industry
With the implementation of a series of national key projects, the instrument industry has been increasingly valued and supported by the government. This will make the market investment value of instrument industry increasingly prominent. However, in the past year, a lot of great events have taken place in the field of instruments and meters. The host of CCTV researched PM2.5 at his own expense, but the data was questioned. The "ten items of water" came out after a thousand calls. The domestic instrument companies acquired overseas. The dark matter detection satellite developed by Chinese scientists was launched into the sky. The laboratory safety is very important, and the fire monitor is indispensable. The relevant meetings of instruments and meters are frequently called Let's wait a minute. Let's summarize.
Chai Jing, the host of CCTV, released the data under the dome, which was questioned. The reliability of relevant testing equipment and data is imminent
In March this year, Chai Jing, the host who left CCTV, released a deep public welfare survey, Chai Jing haze survey: under the dome. Chai Jing used a lot of data and materials to support her conclusion in this promotional film. He knew that the doctoral thesis of the last netizen had something to do with the issue. He looked at it and thought it was a bit wrong. He looked up the materials and found that almost every data had a problem. The first is to intentionally confuse haze and PM2. 5. The second is the lack of testing range and sensitivity data of the sampler, air humidity and wind direction conditions, flow data of the sampler, as well as the background and time of changing data caliber to form misleading impression and tampering data. This report came out, let the netizen cry out: professional things or to professional people to do it!
Then there are a series of problems, such as the data falsification of air purifier developed by Xiaomi company, the lack of precision of various environmental detection instruments and meters, and the falsification of monitoring data. In the second half of 2015, environmental protection departments at all levels verified 8 typical cases of violation of laws, all of which have been handed over to public security organs for handling, and 10 responsible persons have been subject to criminal or administrative detention. Since January 1, 2016, the Ministry of environmental protection has implemented the measures for determination and treatment of falsification of environmental monitoring data. According to the provisions of the measures, the Ministry of environmental protection will carry out special inspection in the next two years to strictly inspect the forgery of local environmental monitoring data, especially air quality inspection data. More severe stick, waving to counterfeiting enterprises and places