CNC grinding machine is a CNC machining center that grinds the surface of the workpiece according to special grinding tools.

Most CNC grinding machines use high-speed rotating grinding wheels. Very few abrasive tools and abrasives such as grinding stones and abrasive belts are used for production and processing, such as honing machines, ultra-fine CNC machining centers, abrasive belt grinders, CNC grinders, grinding and polishing machines.

CNC grinding machine also has CNC surface grinding machine, CNC CNC grinding machine, CNC internal and external CNC grinding machine, CNC vertical universal CNC grinding machine, CNC coordinate CNC grinding machine, CNC forming CNC grinding machine. CNC grinding machine can produce and process high hardness materials, such as hardened steel, cemented carbide, etc., can also produce and process brittle materials, such as tempered glass and marble. The grinder has the advantages of high grinding precision, small roughness and strong grinding force.

At this stage, with the rapid development and gradual improvement of the application of electrical transmission technology (frequency conversion speed regulation technology application, motor vector control technology application, etc.), the mechanical structure of the main transmission device of the high-speed CNC machining center has been greatly optimized, and most of the belt wheel rotation and gear transmission have been canceled.

The spindle of the lathe is driven directly by the closed cabinet motor, and the length of the main transmission gear of the CNC machining center is reduced to zero, and the “zero rotation” of the CNC machining center is completed. This type of spindle bearing motor and rotating structure type of lathe spindle’s “unity”, from the nc machining center spindle bearing components of relative single transmission device and the overall structure, and thus can be made into “main shaft bearing module”, also known as “high speed motorized spindle” (ElectricSpindle, MotorSpindle).

CNC grinding machine high-speed motorized spindle selection, because the current high-speed motorized spindle mainly uses AC high-frequency motor, it is also known as “HighFrequencySpindle” (high frequency spindle). Because there is no intermediate rotation link, it is sometimes called “direct rotation spindle bearing” (DirectDriveSpindle).

Universal grinding machine electric spindle

High-speed motorized spindle has the advantages of compact structure, light weight, low inertia force, low noise, fast loading, high speed ratio, large output power, optimize the CNC machining center design scheme, easy to complete the spindle bearing positioning, is an idealized structure in the high-speed spindle bearing module. Electric spindle bearings use high-speed bearing technology, wear and heat resistance, service life is several times that of traditional rolling bearings.

CNC grinding machine high-speed motorized spindle selection, because the high-speed motorized spindle motor integrated in the spindle bearing module, and the speed ratio is very high, the operation will generate a lot of heat, causing the temperature rise of high-speed motorized spindle, so that the thermal characteristics and dynamic characteristics of high-speed motorized spindle deteriorate, and then affect the normal operation of high-speed motorized spindle. Therefore, some measures must be taken to control the temperature of the high-speed motorized spindle, so that it is constant within a certain value.

At present, the CNC machining center generally adopts the method of forced circulation oil cooling to cool the stator and spindle bearing of the high-speed electric spindle, and the cooling oil to be passed through the oil cooling safety device is forced to circulate outside the spindle bearing stator and spindle bearing, taking away the heat generated by the high-speed rotation of the spindle bearing. In addition, in order to reduce the heat of the main shaft bearing, it is necessary to achieve reasonable lubrication of the main shaft bearing.

Grinding high-speed electric spindle is a new technology application that combines the lathe spindle and the spindle motor in the field of CNC lathes. Together with the application of linear motor technology and the application of high-speed CNC blade technology, the high-speed production and processing are pushed to a new journey.

Grinding machine electric spindle selection, professional quality assurance; Electric spindle is a set of components, which includes the electric spindle itself and its accessories: electric spindle, high-frequency frequency conversion device, oil mist lubricator, cooling device, built-in encoder, tool change device, etc. The rotor of the motor is directly used as the spindle of the machine tool, and the housing of the spindle unit is the motor frame, and it is combined with other parts to realize the integration of the motor and the spindle of the machine tool.

The motor of the electric spindle adopts AC asynchronous induction motor, because it is used in high-speed processing machine tools, when starting, it should be rapidly increased from static to tens of thousands of revolutions per minute or even hundreds of thousands of revolutions, and the starting torque is large, so the starting current should exceed the rated current of the ordinary motor 5 to 7 times. The drive mode has two kinds: frequency converter drive and vector control drive.

The drive control characteristic of the inverter is constant torque drive, and the output power is proportional to the torque. The machine’s latest inverter uses advanced transistor technology to achieve stepless speed change of the spindle.

With the increase in the number of high-precision and high-hardness mechanical parts, as well as the development of precision casting and precision forging processes, the performance, variety and output of grinding machines are constantly improving and growing.

1, surface grinding machine: mainly used for grinding workpiece surface grinding machine.

a, hand grinding machine is suitable for small size and high precision workpiece processing, including arc, plane, groove and other special-shaped workpiece.

b, large water grinding is suitable for the processing of large workpieces, the processing accuracy is not high, and the hand grinder is different.

2. Abrasive belt grinder: grinding machine with fast moving abrasive belt.

3, honing machine: mainly used for processing a variety of cylindrical holes (including light holes, axial or radial discontinuous surface, through holes, blind holes and multi-step holes), can also process conical holes, oval holes, cycloid holes.

4, grinding machine: used to grind the workpiece plane or cylindrical inside, surface grinding machine.

5, cylindrical grinding machine: is a common type of base series, mainly used for grinding cylindrical and conical surface grinding machine.

6, internal grinding machine: is a common type of base series, mainly used for grinding cylindrical and conical inner surface grinding machine. In addition, there are grinding machines with both internal and external circular grinding.

7. Coordinate grinder: internal grinder with precision coordinate positioning device.

8, centerless grinding machine: the workpiece adopts centerless clamping, generally supported between the guide wheel and the bracket, driven by the guide wheel to rotate the workpiece, mainly used for grinding cylindrical surface grinding machine. For example, bearing shaft support.

9, guide grinding machine: mainly used for grinding machine tool guide surface grinding machine.

10, tool grinding machine: grinding machine for grinding tools.

11, multi-purpose grinding machine: used for grinding cylindrical, conical inner, outer surface or plane, and can be used with the servo device and accessories grinding a variety of workpiece grinding machine.

12, special grinding machine: engaged in a type of parts for grinding special machine tools. According to its processing objects can be divided into: spline shaft grinding machine, crankshaft grinding machine, CAM grinding machine, gear grinding machine, thread grinding machine, curve grinding machine, etc.

13, end grinding machine: grinding machine for grinding gear end face.
Grinding is widely used and is one of the main methods of precision machining of machine parts.
However, due to the high speed of the grinding wheel, the grinding wheel is relatively hard, brittle, and can not withstand heavy impact, accidental improper operation, smashing the grinding wheel will cause very serious consequences.

Therefore, the safety technology of grinding processing is particularly important, and reliable safety protection devices must be adopted, and the operation should be focused to ensure that nothing goes wrong. In addition, the fine sand chips and metal chips that splash out on the workpiece of the grinding wheel during grinding will hurt the workers’ eyes, and if the workers inhale this dust in large quantities, it is harmful to the body, and appropriate protective measures should also be taken.