High Precision Machining is defined as a process of changing the dimensions or the performance of workpiece with machining facilities.
According to the temperature of the workpiece while in machining, high precision machining can be divided into cold working and hot working. Usually, machining under indoor temperature, and won't change cause chemical change or phisical phase change is named cold working. On the other hand, if under temperature, higher or lower than room temperature, which will lead to chemical changes or phase changes, it will be called as hot working.
For high precision machining, the machining tolerance can be up to 0.0001-0.001mm, the surface finish Ra can be 0.02-0.1um.
Machining precision is to describe the actual geometrical parameter of the part after machining, such as the size, the form, the position, comparing with the theoretical geometry parameter. The difference from these two parameters is the machining tolerance. The number of the difference show the machining accuracy, the bigger, the lower of the machining precision, the smaller, the higher machining precision.
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Yan'an, Shaanxi Province will build a "three districts and nine parks" in about 10 years, and gradually form an integrated refining and chemical industry, refinement of the chemical industry, greenization of energy use, and ecological development of industries to create a national green energy chemical and ecological industrial base. This is what the reporter learned from the 17th China East-West Cooperation and Investment and Trade Fair held recently.
According to Gao Zhanqing, the person in charge of the Yan'an Municipal Development and Reform Commission's Office, “Yanan Green Energy Chemicals and Eco-industry Industry Development Plan†and “Yan'an Fine Chemicals and New Materials Industry Development Plan†have been completed. Its main content is to build three production bases for oil, coal, and gas. At the end of the "Twelfth Five-Year Plan," crude oil, coal, and natural gas output reached 20 million tons, 55 million tons, and 10 billion cubic meters, respectively, and 200,000 tons of Yanchuan was built. Yearly, Zhidan 800,000 tons/year, Wuqi 1 million tons/year liquefied natural gas project, development of oil gas comprehensive utilization of chemical industry; Second, the development of green energy chemical industry and ecological industry, through the construction of 10 million tons of oil refining supporting million tons of ethylene The large-scale integrated refining and chemical engineering project marked by the mark, and the efficient and clean utilization of coal, create five major industrial sectors: clean and low-carbon stone energy, efficient and clean coal use, fine chemicals and new materials, renewable energy, and productive service industries; The concept of carrying capacity, large projects, and cluster development is based on the “three districts and nine parks†to promote the construction of 154 key projects.
It is understood that the "three districts and nine parks" are Yan'an Yanbei Green Energy Chemicals and Eco-industrial Park, Yan'an Yannan Green Energy Chemicals and Eco-industrial Park, and Yan'an Economic and Technological Development Zone.
Yanan Energy Chemical Planning Green Transformation