哈希私彩Dalian precision machining is a process of changing the overall dimension or performance of the workpiece with machining machinery. According to the temperature state of the workpiece to be processed, it is divided into cold processing and hot processing. Generally, it is processed at normal temperature without causing chemical or phase changes of the workpiece, which is called cold processing. Generally, processing above or below normal temperature will cause chemical or phase changes of the workpiece, which is called hot processing.

Cold working can be divided into cutting and pressure machining according to the difference of machining methods. Hot working commonly includes heat treatment, forging, casting and welding. It generally refers to the processing with accuracy requirements above it5, which is difficult to meet the requirements with ordinary technology and equipment. Generally, precision machine tools, well-designed processes, special tools and measuring instruments need to be used to complete the processing in a suitable environment.

Fine machining, in a broad sense, refers to the machining of small size or one-level small operation size. Generally, the overall dimension is less than 3mm, and there is little or no cutting process, which belongs to fine machining. It is widely used in aerospace, precision instruments, biomedicine and so on. In addition to mechanical processing, micro processing mostly adopts electrical processing, chemical processing, wave processing, plasma, laser, particle, lithography and other process means.

Rapid prototyping technology is developed in the 20th century. It can quickly manufacture samples or parts according to CAD model. It is a material accumulation processing and manufacturing method, that is, three-dimensional forming is completed through orderly accumulation of materials. Rapid prototyping technology integrates modern scientific and technological achievements such as CNC technology, material technology, laser technology and CAD technology. It is an important part of modern advanced machining technology.