There are many types of milling machines. According to different structural forms and processing properties, they can be divided into vertical milling machines, horizontal milling machines, portal milling machines, simulation milling machines and special milling machines.
The universal milling machine is a versatile multi-purpose machine tool.
It can process flat, bevel, spiral and forming surfaces of various parts with cylindrical milling cutters, wafer milling cutters, angle milling cutters, forming milling cutters and face milling cutters. It can also be equipped with universal milling heads. Machine accessories such as heads and round tables are used to expand the processing range.
There are two kinds of universal milling machines, one is X62W horizontal universal milling machine, the milling machine is placed horizontally; the other is X52K vertical universal milling machine, the milling head is placed vertically.
The working principle of these two milling machines is the same, and the electrical control lines are basically the same after serialization.
When machining the workpiece, the milling cutter is mounted on the main shaft, the milling cutter rotates as the main motion, the workpiece moves longitudinally or laterally with the worktable, and the lifting platform moves along the guide rail of the bed to move the workpiece in the vertical direction.
Milling machines without a turntable are called horizontal milling machines.
Universal milling machine circuit design task requirements
Universal milling machine is a general-purpose multi-purpose and high-efficiency machine tool that can process flat, bevel, groove, gear and other workpieces.
The universal milling machine is mainly composed of a bed body, a main shaft, a knife bar, a beam, a work table, a rotary disk, a horizontal turntable and a lifting platform.
The movement form of the milling machine has main motion and feed auxiliary motion.
The rotary motion of the milling cutter is the main motion, and the up, down, left and right, and back and forth movements of the table are feed motions, and other motions (such as the rotary motion of the table) are auxiliary motions.
The milling machine has three motors.
The spindle motor drives the spindle to rotate; the feed motor drives the top, bottom, and left of the table.
Front and rear movement; the cooling pump motor drives the cooling pump to deliver coolant.
1) Main circuit:
The milling machine requires two-way operation of the spindle motor. The spindle has a large inertia and requires a brake parking mode.
The feed motor requires two-way operation.
The cooling pump motor only requires a single line operation.
2) Control circuit:
In order to ensure safe production, for the main motion and feed motion of the milling machine, the feed motion must be run after the milling cutter has been rotated.
The feed motion should be stopped before the milling cutter stops rotating, otherwise the props and lathe will be damaged.
Therefore, there should be an electrical interlock between the spindle motor and the feed motor.
The coolant pump motor can only be started when the spindle motor is working, and the working state is optional.
Only the circuit should correctly display the power supply and the three motors of the spindle, feed, and coolant pump.
The circuit should have the necessary short circuit protection, overload protection and electrical interlock protection.
The circuit should be provided with local illumination.
1) The equipment should be operated under the guidance of the instructor and safety first.
After the device is powered on, it is strictly forbidden to pull the electrical device on the side of the appliance.
Conduct troubleshooting training and try to use unpowered maintenance.
If there is a power overhaul, an instructor must be on hand to monitor.
2) Each motor and bracket ground wire must be installed.
The insulating rubber pad is placed under the equipment, and the thickness is not less than 8mm.
Before operation, carefully check the terminals to loosen or fall off to avoid accidents or damage to the appliance after power-on.
3) If an abnormal sound is issued during operation, the power should be cut off immediately to find out the cause of the problem to be repaired.
The fault noise mainly comes from the phase loss operation of the motor, the contactor and the relay are not properly connected.
4) If the fuse is found to be blown, the fault should be found before the fuse of the same specification can be replaced.
5) Do not interchange the number tube at the end of the line during the maintenance setup failure.
6) Do not use too much force during operation, the speed should not be too fast; the operating frequency should not be too frequent.
7) After the end of the internship, the power plug should be removed and the switches should be set apart.
8) Make an internship record.