The hydraulic circuit for a milling machine is comparatively different from the hydraulic circuit of the surface grinding machine and hydraulic circuit of the shaper machine. This is because the table movement in milling operation is comparatively slower. Also, the different feeds or you can say adjustable feeds are required for milling different types of work.
Hence, in the hydraulic circuit for the milling machines in addition to other elements a flow control valve is incorporated in the circuit.
Hydraulic Circuit diagram of Milling Machine
The hydraulic circuit for milling machines is shown in the figure.
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| Hydraulic Circuit diagram of Milling Machine |
As the circuit diagram shows, it has a power pack unit, a direction control valve, metering valves for metering the flow of fluid, a hydraulic cylinder, and a table for the machine movement.
Component of Hydraulic Circuit of Milling Machine
The hydraulic circuit of the milling machine consists of the following components
- Oil reservoir or tank
- Hydraulic pump
- Booster pump
- Pressure Relief Valve
- Spool type of direction control valve
- Double-acting cylinder
- Flow control valve
It has a main pump which is low pressure and a high discharge pump, and one booster pump, which is a low discharge high-pressure pump. The function of the booster pump is to boost the hydraulic pressure to a level above that provided by the main pump.
There are two sets of flow control valves and check valves, fitted in both the supply and return line to the cylinder, to achieve speed control in both directions.
A manually operated spool valve decides the direction of the flow of the cylinder. The stroke length of the cylinder is adjustable through limit switches. The limit switch disconnects the supply of oil to the cylinder when the table reaches the set position.
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