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CNC machinery parts

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CNC main transmission movement refers to the production of transmission sports, such as cutting, CNC lathe spindle drive the workpiece on the rotary motion, vertical machining center on the driven shaft grinding milling, boring and the rotary motion, etc. CNC main transmission movement is the main drive motor through.
One of the main driving movement speed, the system
   
    At present, the main drive motor CNC machine has been basically no longer use normal ac induction motor and the traditional dc motor, they are gradually been emerging communication frequency conversion speed servo motor and dc servo motor instead. The requirement of nc machine has bigger speed range, to ensure the process can choose reasonable scraps dosage, achieve the best productivity and machining precision and surface quality. In order to adapt to the workpiece and all kinds of workpiece material requirements, many congratulations automatically change of nc machine tools and machining center main movement speed range should be expanded further. When the CNC control commands automatically according to the variable speed institutions, so must meet the requirements for automatic operation. Due to the dc and ac speed spindle motor speed control system is perfect, not only can easily achieve a wide range of stepless speed, but also reduce the middle relay link and improve the reliability of the variable speed control, therefore in the main drive system of nc machine more can show its superiority. In order to ensure the torque, nc machine tools in communication and dc motor speed stepless basis with gear. Due to the motion is adopted, in large variable measure on CNC lathe can be realized when he inclined constant speed chip control, so as to further improve the production efficiency and surface quality. CNC machine main transmission mainly have three configuration.

With the main drive transmission gears
    This is a type of nc machine tools, a way of using more. Through a few of gear reducer, expand the output torque of output shaft, in order to meet the requirements of torque characteristics. Part of the small numerically-controlled machine tool industry USES this transmission mode, to get strong scraps of torque needed. Sliding gears shift fork or mostly adopts hydraulic driven directly by the hydraulic oil cylinder gears.
Through the main transmission belt transmission
    It is mainly used in small nc machine tools, can avoid gear transmission is caused by the vibration and noise. But it can only be used with requirements of the spindle torque characteristics.

Speed motor driven directly by the main drive
    The main transmission mode simplify the spindle box and spindle structure, effectively improves the rigidity of the spindle component. But the spindle motor torque output shaft of precision of fever.
Second, CNC spindle component
    Numerical control of spindle component of precision, stiffness and thermal deformation of machining quality have direct effect. Due to the process of CNC machine manual adjustment wrong, so the effect is more serious. Current CNC spindle factory mainly have three types.

Supported by different and bearings
    Supported by double row short before cylindrical roller bearing and double row angular contact 60 ° to thrust ball bearings, supported by pairing after to thrust ball bearings. This configuration forms of spindle rigidity to greatly improve comprehensive strength, can satisfy the requirements, so common cutting applications in various numerical control machine.
    Prior to the bearing in mind thrust ball bearings
The thrust ball bearings at high performance is good, can reach the highest spindle speed 4000r/min. But, it's carrying capacity, and applicable to small, light, high and close nc lathe.
    Double row and single row circular cone roller bearings
This bearing radial and axial stiffness, can withstand the heavy load high, especially can bear strong move load, installation and adjustment performance. However, the bearing spindle speed limits the highest accuracy and precision, so use medium, low and the heavy nc machine tools. At the agency, the axis to handle the clamping chuck and cutter axis, unloading, spindle bearing orientation and nip-gap adjustment, the spindle component of lubrication and sealing and a series of other problems of technology. In order to minimize the spindle component of machine thermal deformation temperature, usually work precision of the circulatory system using lubricating the spindle component of heat away, make the spindle component and cabinet constant temperature. In some numerically-controlled boring and milling machine adopts special refrigeration equipment, ideal realization of the temperature control. In recent years, some of nc machine adopts advanced spindle bearing grease, use sealing into ways, each with a grease lubrication can be used in 7 to 10 years. In order to make the lubricating oil and grease from mixing, usually adopts labyrinth seal.
    For CNC lathe spindle, because in it at both ends of the installation of the structure of power chuck heavy clamping cylinder, and therefore must be further improved, spindle rigidity and reasonable design, so as to improve the connection with the spindle end power chuck of joint stiffness.
For CNC milling boring or spindle, considering the realization of automatic cutting, spindle speed or loading is equipped with automatic loading and unloading, tools and main shaft must stop when the clearing device inside scraps.

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