Precautions for machine tools-vigilance-small common sense: detail the application and precautions of grinding machines such as grinding grinding grinding grinding beds, variable converter grinding machine selection, and system grinding beds and speed adjustment.
Morning bed processing grinding load characteristics
Depending on the size of the diameter grinding bed of different grinders, the speed of the motor grinding machine of the main sand wheel is equal to the speed of the grinding machine.The size of the grinding grinding machine depends on the output torque of the grinding machine grinding machine.At the high -speed section of the motor grinding machine of the driving of the grinding machine, compared to the speed of the grinding wheel output, the processing of the grinding machine is small in diameter and less grinding into less;The grinding wheel is large, and the grinding force of the sand wheel is also increasing, and it is difficult for the motor to run at a constant torque/constant speed.The change of the grinding machine changes in the grinding machine such as vibrating knife pattern/burning paste/processing accuracy.The variable frequency speed regulating motor grinding machine has a stepless speed regulation, and the constant torque output can make up for the above defects.
Inverter grinding machine selection
According to the characteristics of running grinding beds, consider meeting the requirements of mechanical processing grinding grinding grinding machines and equipment investment costs, and use automatic torque to improve the functional mill vector inverter.Take the Sanch-S2000 series as an example. According to the grinding motor motor grinding power, the power of 18.5kW/15KW grinding machine is used. Taking 15KW as an example, the rated voltage three-phase 380V, the output current 32A, the frequency control 0.5-400Hz, the speed control 0.1%, the pass, the pass, the pass, the pass, overThe load capacity is 150%/60s.With automatic torque improvement function, flexible PWM control, it can achieve lower noise operation, more than 10 sections of grinding machine speed control.
System grinding bed start and speed adjustment
Most of the motor of the grinding bed and grinding bed wheel motor uses the stars -triangle conversion starting circuit.Use the inverter to replace the original circuit, use the original contactor grinding bed to open the contacts to control the operation of the frequency converter grinding machine. Consider the masol to start the grinding machine inertia.The torque of the type milling wheel can be adjusted between 50%-80%.The system speed adjusts the frequency through an external capable of adjustment, and adjusts the speed of the abrasive bed according to the different diameter of the workpiece. Due to the limitation of the grinding machine such as the grinding machine at a high speed of the motor at a high speed, the maximum frequency of the motor is set to 60Hz; due to the low speed at low speedThe effect is poor. Considering the gear gear factors of the worker rotation grinding bed and the actual maximum processing workpiece size, the minimum frequency is set to 35Hz, and the benchmark is set to 50Hz frequency.According to the analysis of the load characteristics of the previous mill, it can be seen that the high -speed segment is the constant power nature, the low -speed segment is the constant torque nature, and the load is required to be large and the overload capacity is strong during low speed.For motor benchmarking above the frequency, in order to ensure that the motor is not voltage, a constant voltage frequency conversion speed is used.It can be seen from the motor theory that when the voltage remains unchanged and the frequency increases, the magnetic flux of the motor bed is decreased as the frequency grinding machine is increased; when the motor current is the rated current, the maximum allowable output torque is reduced, and the output may be allowed to outputThe power is unchanged, which is a constant power speed adjustment, which is suitable for constant power load.Below the base frequency, in order to ensure that the magnetic flux of the motor is unchanged, the V/F = constant grinding machine transformer variable frequency frequency conversion speed is used. When the motor grinding bed current is the rated current, the motor allowed the output torque to remain unchanged.Quick, suitable for constant torque load.However, when the speed is low, the internal resistance of the motor cannot be ignored. If the V/F is still kept as a constant, the motor torque will be reduced.Automatic compensation function of the torque of the grinding machine, select the grinding bed V/F curve after compensation.
System design grinding precautions
The accuracy of grinding wheel balance grinding beds should be improved: In order to reduce the abrasive vibration at high speed at high speed, the motor rotor and sand wheel grinding bed should be increased and corrected.
During low speed, grinding bed heat dissipation: Because the motor is cooling and cooling from the cold fan method, the heat dissipation conditions deteriorate at low speed, and the load torque is large, and the temperature of the motor will increase. Thereforein accordance with.
During the frequency conversion speed adjustment, the output of the inverter contains a high harmonic, and the electromagnetic noise will be generated in the motor. Therefore, the output is installed with zero -phase noise filter to reduce the auxiliary fire interference and inductive noise.
The inverter grinding parameter setting item is important to lock the function of reversal/maximum frequency/stall.
This article analyzes the application of the grinding machine on the machine processing industry of the inverter in the mechanical processing industry. As a power grinding grinding grinding grinding wheel, the main electric motor introduces variable frequency speed adjustment technology to meet the needs of various axis grinding grinding grinding machines to improve the efficiency, improve the axis, and improve the axis.The quality of the grinding grinding bed is saved by energy.Combined with the actual on -site grinding bed, the operator responded more handy, the surface of smooth surface was high, and the finished product rate increased.

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