Temperature state and technical specification of precision machining

In the process of operation, precision machining is a process of changing the size or performance of the workpiece with processing machinery. According to the temperature state of the workpiece, precision machining can be divided into cold machining and hot machining to a certain extent. Generally processing at room temperature, and does not cause chemical or physical phase changes of the workpiece, called cold processing.
Precision machining is generally processed at or below normal temperature, which will directly cause the chemical or phase change of the workpiece. It is effectively called hot machining. Cold machining can be divided into cutting machining and pressure machining according to the difference of processing methods. Hot working includes heat treatment, forging, casting and welding.
Precision machining is the process of changing the size or function of the workpiece through its various machines. According to the temperature of the workpiece to be processed, it can be divided into cold processing and hot processing. Among them, the working procedure in machining refers to the skill process which is finished continuously for one or a group of workpieces at a working address. The primary characteristic of a process is that it does not change the processing target, equipment and operator, and the content of the process is continuous. Its skill process can be divided into the following two processes.
The technical specification of precision machining is one of the technical documents such as the technical process and operation method of regular parts machining. It is written into technical documents according to the rules under the specific production conditions, and used to guide production after being reviewed. The technical specification of machining usually includes the following contents: the technical road of workpiece processing, the specific content of each process and the equipment and technical equipment used, the inspection items and methods of workpiece, cutting amount, time quota, etc.
Fine parts processing technology is to change the shape, scale, relative orientation and nature of the production target on the basis of the process, so as to turn it into finished products or semi-finished products. It is the specific elaboration of each process and each process. For example, as mentioned above, rough machining may include blank making, grinding, etc., and finish machining may be divided into turning, fitter, milling machine, etc.