Precision machining

    Precision machining is a process of changing the workpiece, there are two types of cold working and hot working

    Precision machining is a kind of processing machinery The process of changing the dimensions or performance of the workpiece. According to the temperature state of the workpiece to be processed, it is divided into cold processing and hot processing. Generally processing at room temperature, and does not cause chemical or phase changes of the workpiece, it is called cold processing. Generally, processing at higher or lower than normal temperature will cause the chemical or phase change of the workpiece, which is called thermal processing. Cold processing can be divided into cutting processing and pressure processing according to the difference in processing methods. Thermal processing commonly includes heat treatment, forging, casting and welding.

    What are the processing requirements for precision parts processing technology? 1. Remove the oxide scale of the parts, and there should be no scratches, abrasions and other defects that damage the surface of the parts on the processed surface of the parts, and remove burrs and flashes; 2. After quenching and tempering, the parts are subjected to high-frequency quenching, tempering at 350～370℃, HRC40～45, carburizing depth 0.3mm, and high temperature aging treatment. 3. Uninjected shape tolerance should meet the requirements of GB1184-80, uninjected length dimension allowable deviation & plusmn; 0.5mm, casting tolerance zone is symmetrical to the basic size configuration of rough casting; 4. Uninjected fillet radius R5, uninjected The angles are all 2×45°, the acute angle is blunt; 5. The temperature should not exceed 100℃, after the gear is assembled, the contact spots and backlash of the tooth surface should meet the requirements of GB10095 and GB11365; 6. When assembling the hydraulic system Sealing filler or sealant is allowed, but it should be prevented from entering the system. The parts and components (including purchased parts and outsourcing parts) that enter the assembly must have the qualification certificate of the inspection department before assembly.