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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The government of Wulanchabu was informed that on March 28th, Fengzhen Municipal People's Government and Hainan International Resources (Group) Co., Ltd. signed an annual output of 200,000 tons of high-titanium slag, titanium sponge, and titanium dioxide-related titanium in Haikou. Industrial extension project cooperation agreement.
The company plans to invest 4 billion yuan, the project is divided into three phases. In the first phase, it will invest 1.2 billion yuan to build an annual production capacity of 200,000 tons of high-titanium slag and 50,000 tons of wear-resistant cast balls. By the end of 2014, the project will have a production capacity of 100,000 tons of high-titanium slag and 20,000 tons of wear-resistant cast balls, with a production value of 1 billion yuan and a tax of 80 million yuan. Sponge titanium, titanium dioxide and related titanium industry extension projects will reach full production within five years. After the project is fully put into production, the output value will be 3 billion yuan, the industrial added value will be 1 billion yuan, and the profits and taxes will be 500 million yuan.