In modern manufacturing, high-precision cylindrical grinding machines have become key equipment for producing precision shaft parts due to their excellent machining accuracy. However, its complex electrical system inevitably experiences various faults during long-term operation. Mastering effective electrical fault handling methods is the key to ensuring stable operation of grinding machines and maintaining high-precision machining.
Power failure is one of the common electrical problems in high-precision cylindrical grinding machines. When the grinder cannot be started, the first step is to check the external power supply circuit. Use a multimeter to measure the power supply voltage and check for any conditions such as phase loss, unstable voltage, or low voltage. If the external power supply is normal, it is necessary to check the power switch, fuse, and contactor inside the grinder. The melting of a fuse may be due to a short circuit in the circuit, such as a short circuit in the motor winding or damage to the insulation of the circuit. At this time, it is necessary to carefully investigate the short circuit point, repair it, and then replace it with a fuse of the same specification. Contactor failure may lead to poor contact, causing the grinder to be unable to power on normally. The fault can be determined by observing whether the contactor contacts are burned or oxidized, using a multimeter to check whether the coil is powered on, and replacing the contactor if necessary.
The malfunction of the control system has a significant impact on the operation of high-precision cylindrical grinding machines. As the "brain" of the grinding machine, once a malfunction occurs in the CNC system, it can lead to a decrease in machining accuracy or even equipment shutdown. When the CNC system alarms, carefully read the alarm code and clarify the cause of the fault by consulting the equipment manual. For example, servo alarms may be caused by servo drive failures, servo motor damage, or encoder abnormalities. For servo drive faults, check whether the input and output voltage and power module of the drive are normal, and determine the faulty drive through replacement method; If there is a problem with the servo motor, it is necessary to test the motor winding resistance and insulation performance; Encoder failure can be determined by checking whether its output pulse signal is normal, and replacement can be carried out if necessary.
Sensor malfunction is also an important factor affecting the normal operation of the grinder. High precision cylindrical grinding machines rely on multiple sensors to achieve precise control, such as displacement sensors for monitoring the relative position between the grinding wheel and the workpiece, and temperature sensors for monitoring the temperature of key parts such as motors and bearings. When the sensor malfunctions, it may cause machining size deviation or equipment abnormal alarm. If the displacement sensor fails, an oscilloscope can be used to detect its output signal and check whether the power supply and connection wires of the sensor are normal. If there is no hardware problem, it may be an internal circuit fault of the sensor and needs to be replaced; When the temperature sensor malfunctions, it is also necessary to check whether its installation is loose, whether the circuit is damaged, and replace the sensor with a new one if necessary.
In the face of electrical faults in high-precision cylindrical grinders, maintenance personnel need to be familiar with electrical principles, gradually identify the fault points in the order from power supply to control system, and then to sensors, and take targeted measures to quickly and effectively solve the problem and ensure the continuous and stable operation of the grinder.