Working machinery

Abstract

To provide a machine tool which can reduce an air consumption amount required for air purge.SOLUTION: A machine tool 1 includes: a first main shaft; a first headstock which is positioned on an outer peripheral side of the first main shaft with a gap Sk between the first headstock and the first main shaft and rotatably supports the first main shaft; air supply passages 56a, 56b which are formed to be connected to the gap Sk and has air passing from an air supply source 200; a solenoid valve 51 which is provided on the air supply passages 56a, 56b and can be switched between an open state in which air can be supplied to the gap Sk and a closed state in which the supply of air to the gap Sk is stopped; a pump 71 which can be switched between ON in which coolant liquid is supplied to a machining point of a workpiece and OFF in which the supply of the coolant liquid is stopped; and a control section 300 which controls the solenoid valve 51 and the pump 71 so that the open state and the closed state of the solenoid valve 51 are interlocked with ON and OFF of the pump 71.SELECTED DRAWING: Figure 7

Claims

1. A machine tool for processing a workpiece, A rotating body and A support body is located on the outer circumference of the rotating body with a gap between it and the rotating body, and rotatably supports the rotating body. An air supply passage is formed to connect to the aforementioned gap, through which air from an air supply source passes, A valve provided on the air supply path, which can be switched between an open state that allows air to be supplied to the gap and a closed state that stops the supply of air to the gap, A fluid supply unit that can be switched between ON, which supplies coolant fluid to the machining point of the workpiece, and OFF, which stops the supply of coolant fluid, A control unit that controls the valve and the liquid supply unit, To realize the functions of the machine tool, a plurality of operating parts that operate using air from the air supply source as the operating source, A first pressure adjustment unit adjusts the pressure of the air supplied to the gap, It includes a second pressure adjustment unit for adjusting the pressure of the air supplied to the aforementioned operating unit, The control unit, Upon receiving a command to start supplying coolant fluid, the valve is switched to the open state, and the fluid supply unit is switched to the ON state. Upon receiving a command to stop the supply of coolant fluid, the valve is switched to the closed state, and the fluid supply unit is switched to the off state. The rotating body and the support are provided in multiple sets. The air supply path comprises a first air supply path from the air supply source to the branching point, and a second air supply path and a third air supply path branching off at the branching point. The second pressure adjustment unit is provided on the first air supply path. The first pressure adjustment unit and the valve are provided on the second air supply path. The second air supply passage is connected in parallel to the gap between the multiple sets of rotating bodies and the support, The third air supply path is connected in parallel to the plurality of operating parts. Machine tools.

2. When the control unit receives the stop command to stop the supply of coolant fluid, it switches the fluid supply unit from the ON state to the OFF state, and then, after a preset first set time has elapsed, switches the valve from the open state to the closed state. The machine tool according to claim 1.

3. When the control unit receives the start command for the start of coolant supply, it switches the valve from the closed state to the open state, and then, after a preset second set time has elapsed, switches the liquid supply unit from off to on. The machine tool according to claim 1 or 2.

4. A throttle valve for controlling the airflow is provided on the second air supply path corresponding to all of the gaps, The machine tool according to claim 1 or 2.

5. The control unit is Upon receiving the command to stop the supply of coolant fluid, the fluid supply unit is switched from the ON state to the OFF state, and after a preset first set time has elapsed, the valve is switched from the open state to the closed state, Upon receiving the start command to begin supplying coolant fluid, the valve is switched from the closed state to the open state, and after a preset second set time has elapsed, the fluid supply unit is switched from the off state to the on state. The second setting time is shorter than the first setting time. The machine tool according to claim 1.

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