Dalian precision machining is a process of changing the size or performance of workpieces by machines. According to the temperature state of the workpiece, it is divided into cold machining and hot machining. Generally speaking, processing at room temperature without causing chemical changes of the workpiece is called cold processing. Generally, the processing in which the workpiece may undergo chemical changes due to the process above or below the normal temperature is called hot processing. Cold working can be divided into different processing methods. For cutting and pressure machining. Heat treatment is commonly used in heat treatment, plasticity, casting and welding.

Precision mechanical cold working. 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. In addition, cold and heat treatment is often used during assembly. For example, during bearing assembly, the inner ring is often cooled in liquid nitrogen to shrink its size, the outer ring is properly heated to enlarge its size, and then it is assembled together.

The outer ring of the wheel of the train is also sleeved on the substrate by heating, and its firmness can be ensured when cooling (this method is still applied to the transfer process of some parts). Mechanical processing includes: filament power winding, laser cutting, heavy processing, metal bonding, metal drawing, plasma cutting, precision welding, roll forming, sheet metal bending, die forging, water jet cutting, precision welding, etc.

Broadly speaking, machining refers to the process of manufacturing products by mechanical means; Narrow meaning is to use lathes, milling machines, drilling machines, grinders, stamping machines. Many equipment will be used in the process of precision machining. Some commonly used mechanical equipment are listed below:

Such as wire cutting, EDM, deep hole EDM, CNC optical projection grinding, tool grinder, universal grinder, NC coreless grinder, surface grinder, inner and outer diameter grinding, precision surface grinder, precision forming grinder, large water mill, NC milling machine, grinder, machining center, PVD titanium plating machine, laser welding machine, carbonized water cleaning machine, barrel grinder Vacuum heat treatment furnace, etc.