China's induction heat treatment technology began in the 1950s, nearly 20 years later than industrial developed countries. In the next 30 years, due to domestic economic system problems and foreign technology blockade, China's induction heat treatment technology has developed slowly, and the gap with industrial developed countries has been widening year by year. By the 1980s, the main technology and start-up of induction heat treatment in China. The level of time is not much improved.
I. Overview of 1950-1980
Shanghai is China's largest industrial city, and its industrial technology level largely reflects China's industrial technology standards. Looking back at the history of induction heat treatment in Shanghai, before the reform and opening up, the total number of induction heat treatment equipment was more than 20. The power supply for heating was copied from the mechanical IF generator and tube high frequency of the former Soviet Union. Although it was improved, it was not qualitative. The change, the quenching machine basically uses hydraulic or simple mechanical transmission. Most of these induction heat treatment equipments are distributed in the heat treatment workshops of state-owned large and medium-sized enterprises, mainly serving the small number of parts of the enterprise, and generally do not undertake the business of the external units. At that time, only one of the three professional heat treatment plants in Shanghai was able to undertake the induction heat treatment business, but the number of parts processed only accounted for about 1/10 of the total heat treatment of the plant.
In 1959, Shanghai began trial production of cars. From the international automobile production process, nearly half of the auto parts that need heat treatment should be completed by induction heat treatment, which indicates that the automobile manufacturing industry is a highly correlated industry with heat treatment, especially induction heat treatment. However, in 1964, small batch production of "Shanghai" began.
The brand car did not play a role in boosting the development of Shanghai induction heat treatment. The reason is that the “Shanghai†brand car did not form as large as the foreign automobile industry. Therefore, it is impossible to expect only an annual output of only a few dozen or hundreds of vehicles until the production is stopped. At the time of 1991, the capacity of 7,000 cars was reached to drive the development of the associated induction heat treatment. Compared with well-type wells, box furnaces, salt bath furnaces, etc., which are more versatile at the time, the induction heat treatment with stronger selectivity and less equipment can only become the role of “running dragonâ€.
Second, the period of rapid development
After the implementation of economic reforms and opening up, Shanghai Volkswagen Automotive Co., Ltd. was established in March 1985. In 1986, China officially listed the automobile industry as a pillar industry, and determined the principle of “high starting point, large quantity, and specialization†for the development of the car industry. In 1987, Shanghai launched the Santana localization project to improve the localization of cars. rate. Driven by the power of the two engines of the policy and the automotive industry, Shanghai's heat treatment industry has undergone technological transformation with unprecedented enthusiasm and intensity. With the development of Shanghai Volkswagen and the subsequent establishment of Shanghai GM, Shanghai's induction heat treatment technology has finally taken the pace.
So far, the number of factories with induction heat treatment equipment in Shanghai has grown to 69, with a total of 231 sets of equipment, including 62 brands in industrialized countries, accounting for 27% of the total equipment. The rest of the equipment belongs to domestic independent brands. . Among all the devices, there are 153 transistor power supplies, of which 84% are totals of NC or PLC control systems, and 89% of the machines use modern mechanical transmission technologies such as ball screws and linear guides. 92% of foreign brand equipment belongs to the auto parts company under the Shanghai Automotive Industry (Group) Corporation, and is mainly produced online in the form of special planes.
In Shanghai, there are 8 factories with more than 5 induction heat treatment equipments, and there are only 15 factories with one induction heat treatment equipment. There are 26 factories and 128 equipments for the automotive industry. In order to realize the localization of the sensor on the imported induction heat treatment equipment, Shanghai has established a professional sensor manufacturing company in 2007. Its materials are exquisite and well-made, and the price is only 1/3 of the import.
Wood Activated Carbon is a black powder, granular or pellet or amorphous with porous carbon. The main component is carbon, which also contains small amounts of oxygen, hydrogen, sulfur, nitrogen, and chlorine. It is mainly made of wood, fruit shells, coal and other high-temperature activation. Carbon is the most stable element in nature. Activated Carbon also has this feature. Activated carbon pore structure is advanced, with a large surface area (500 ~ 1000 m2/g), even higher, has a strong physical adsorption properties, can adsorb gas, liquid or colloidal solids; for gases, liquids, adsorbed substances The quality can be close to the quality of the activated carbon itself. Its adsorption is selective, non-polar substances are more easily adsorbed than polar substances. In the same series of substances, substances with higher boiling points are more easily adsorbed, and the pressure is higher, the temperature is lower, the concentration is greater, and the amount of adsorption is greater. Conversely, decompression and warming are favorable for desorption of gases.
Wood Activated Carbon
Wood Activated Carbon,Activated Charcoal,Charcoal Tablets,Activated Charcoal Tablets
NINGXIA SINOTOPSKY INTERNATIONAL TRADING CO.,LTD. , http://www.nxsinotopsky.com