豆传媒剧在线mv在线观看|传媒剧在线mv入口|9传媒剧在线mv在线看|豆传媒剧mv入口在线看|豆传媒剧在线观看免费|爱豆传媒剧情在线观看Dalian precision machining and cold machining can be divided into cutting and pressure machining according to the difference of machining methods. Common hot working methods include: heat treatment, forging, casting and welding. 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. Heat treatment, forging, casting and welding are common in hot working. For the precision instrument used for measurement, its structure can be divided into eight functional components: reference, sensory conversion, conversion amplification transmission, aiming / reading, data processing, display and recording, drive control, mechanical structure and so on.

It mainly includes various force measuring instruments, strain gauges, acceleration and velocity measuring instruments, torque measuring instruments, vibration measuring instruments, universal material testing machine and Brinell hardness tester. Mechanical technology covers all Bai aspects of machinery, ranging from castings weighing several tons to screws, that is, it only involves "ordinary goods". Precision mechanical technology only focuses on fine machining processes.

The process of changing the overall dimension or performance of a workpiece. 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. Typical example: the production of mechanical watches will not be involved in mechanical technology anyway. Another example is the production of internal parts of some instruments and meters, etc.