JP5997520B2 - Machine Tools - Google Patents

Description

  The present invention relates to a machine tool for machining a workpiece.

  As a machine tool for grinding a workpiece, a workpiece support device having a support surface for supporting the workpiece, a tool spindle on which a grinding wheel is detachable, a spindle head that rotatably supports the tool spindle, and coolant are stored. A coolant tank and a pump that sucks up the coolant in the coolant tank and supplies the coolant to the machining area. (For example, refer to Patent Document 1).

JP 2003-025181 A

In the machine tool described above, a drive device for rotating the tool spindle and a drive device for driving the pump are provided separately, and the pump continues to drive even if the rotation of the tool spindle is stopped. There is a problem that becomes larger.
Moreover, since the supply and non-supply of the coolant to the machining area is switched by opening and closing the solenoid valve provided in the coolant pipe, there is a problem that the control becomes complicated.
In addition, since the coolant is sucked up to the pump side even during non-grinding and the amount of coolant circulating in the machine tool is large, there is a problem that it is necessary to increase the storage amount of the coolant tank.
Moreover, since the tool and the pump are driven by separate drive devices, there is a problem that energy for driving the machine tool is increased.

  The present invention solves the above-described problems, suppresses heat generation of the pump, simplifies control of supply and non-supply of coolant to the processing region, and can reduce the amount of coolant tank stored. It is an object of the present invention to provide a machine tool capable of reducing energy for driving.

In order to solve the above problems, the present invention is a machine tool, a work support device having a work support surface for supporting a work, a tool spindle on which a tool is detachable, and a spindle that rotatably supports the tool spindle. A head, a drive device for rotating the tool spindle, a pump fixed to the outer surface of the spindle head, a coolant tank for storing coolant, and one end connected to an inlet of the pump, the other end being the coolant. A suction pipe connected to the tank, and a discharge pipe disposed at one end of the suction pipe connected to the discharge port of the pump and disposed at the work area of the workpiece . The pump is a trochoid type, and an inner rotor of the pump is connected to the tool spindle, and the pump is driven by the rotational force of the tool spindle being transmitted to the pump. Yes.

In this configuration, when the tool spindle is rotated, the pump is driven to supply the coolant to the machining area. Thus, since the pump is driven by the drive device for rotating the tool spindle, when the rotation of the tool spindle is stopped, the pump is also stopped and the coolant supply is stopped. That is, the pump is driven only when the workpiece is processed, and the coolant is supplied to the processing area.
Therefore, in the machine tool of the present invention, heat generation of the pump is suppressed, and supply / non-supply control of the coolant to the machining area is simplified. Further, since the amount of coolant circulating in the machine tool is reduced, the storage amount of the coolant tank can be reduced. In addition, since the tool and the pump are efficiently driven by one driving device, the energy for driving the machine tool can be reduced.
Further, since the pump is of a trochoid type and the inner rotor of the pump is connected to the tool spindle, the suction efficiency and discharge efficiency of the pump can be increased and noise can be suppressed.

  In the above-described machine tool, when the drive device is an electric motor having a stator provided in the spindle head and a rotor provided in the tool spindle, and the drive device is incorporated in the spindle head The machine tool can be reduced in size and weight.

  In the machine tool of the present invention, the pump is driven only when the workpiece is machined by the driving device for rotating the tool spindle, and the coolant is supplied to the machining area. The supply / non-supply control becomes simple. Further, since the amount of coolant circulating in the machine tool is reduced, the storage amount of the coolant tank can be reduced. In addition, since the tool and the pump are efficiently driven by one driving device, the energy for driving the machine tool can be reduced.

It is a whole lineblock diagram showing the machine tool of this embodiment.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In the present embodiment, the case where the machine tool of the present invention is applied to a grinding apparatus for grinding the surface of a workpiece will be described.

  As shown in FIG. 1, the machine tool 1 includes a bed 10, a work support device 20, a tool spindle 30 on which a grinding wheel 2 (“tool” in the claims) can be attached and detached, and a tool spindle 30 that is rotatable. Is a vertical grinding device that includes a spindle head 40 that supports the tool spindle 30 and a drive device 50 that rotates the tool spindle 30, and the axial direction of the tool spindle 30 is arranged vertically. The work support device 20 and the spindle head 40 are supported by the bed 10.

  Furthermore, the machine tool 1 includes a pump 60 connected to the tool spindle 30, a coolant tank 70, one end connected to the suction port 63 of the pump 60, and the other end connected to the coolant tank 70, and a suction pipe 81. One end is connected to the discharge port 64 of the pump 60, and the other end is provided with a discharge pipe 82 disposed in the processing region 3.

The workpiece support device 20 has a workpiece spindle 21 having a workpiece support surface 21a formed on the upper surface. The work spindle 21 is rotatable about a vertical axis by a driving device (not shown).
A chuck (not shown) is provided on the work support surface 21a, and the work W is supported on the work support surface 21a by sandwiching the work W placed on the work support surface 21a by the chuck.

  The spindle head 40 is disposed above the workpiece support surface 21 a, and is attached to the cylindrical main body portion 41, the lower lid 42 attached to the lower end surface of the main body portion 41, and the upper end surface of the main body portion 41. And an upper lid 43. The spindle head 40 is movable in the left-right direction and the up-down direction with respect to the bed 10 by a feed mechanism (not shown).

A mounting hole 44 passes through the main body portion 41 in the vertical direction. A small-diameter hole 44 a is formed in the lower part of the attachment hole 44, and a large-diameter hole 44 b is formed in the upper part of the attachment hole 44.
A lower end opening 42a having a diameter smaller than that of the small diameter hole 44a is formed at the center of the lower lid 42. Further, an upper end opening 43a having a diameter smaller than that of the large-diameter hole 44b is formed at the center of the upper lid 43. The center positions of the lower end opening 42 a and the upper end opening 43 a are arranged on the central axis of the mounting hole 44.

The tool spindle 30 is a shaft member having a circular cross section, the axial direction is arranged in the vertical direction, and the grinding stone 2 can be attached to and detached from the lower end surface 30a. In the tool spindle 30, a large-diameter shaft portion 31 is formed below a substantially intermediate position in the vertical direction, and a small-diameter shaft portion 32 is formed on the upper side.
The tool spindle 30 is inserted through the mounting hole 44, and a lower end portion projects from the lower end opening portion 42a, and an upper end portion projects from the upper end opening portion 43a.

  A plurality of bearings 33 are fitted on the large diameter shaft portion 31 of the tool spindle 30. A plurality of bearings 33 are interposed between the outer peripheral surface of the large-diameter shaft portion 31 and the inner peripheral surface of the small-diameter hole portion 44a, so that the tool spindle 30 is pivotally supported by the spindle head 40 so as to be rotatable about the axis. ing.

  The grinding wheel 2 includes a disc member 2a and an annular grindstone 2d provided on the outer peripheral edge of the lower surface 2b of the disc member 2a. The grinding wheel 2 has a central portion of the upper surface 2c of the disk member 2a that is detachable from the lower end surface 30a of the tool spindle 30. Further, in the disc member 2a, a plurality of supply paths 2e penetrating the disc member 2a in the vertical direction are arranged at equal intervals in the circumferential direction inside the grindstone 2d.

  The grinding wheel 2, the work support device 20, and the upper surface of the bed 10 are covered with a processing chamber cover 11 attached to the bed 10. The inside of the processing chamber cover 11 is a processing region 3 for processing the workpiece W.

  The drive device 50 is an electric motor having a stator 51 provided on the inner peripheral surface of the large-diameter hole portion 44b of the spindle head 40 and a rotor 52 fitted on the small-diameter shaft portion 32 of the tool spindle 30. As described above, in the machine tool 1, the driving device 50 is incorporated in the spindle head 40.

The pump 60 is a trochoidal pump, and accommodates an inner rotor 61 formed with external teeth, an outer rotor 62 formed with internal teeth meshing with the external teeth, and both rotors 61, 62. And a casing 65 in which a discharge port 64 is formed.
The casing 65 is fixed to the upper surface of the upper lid 43 of the spindle head 40. The inner rotor 61 is connected to the upper end portion of the tool spindle 30.

  In the pump 60, when the driving device 50 is driven to rotate the tool spindle 30, the inner rotor 61 rotates, the outer teeth of the inner rotor 61 mesh with the inner teeth of the outer rotor 62, and the outer rotor 62 rotates. The coolant C is sucked into the cell from the suction port 63 by the change in volume of the plurality of cells formed between the tooth surfaces of the rotors 61 and 62, and the coolant C is discharged from the discharge port 64. As described above, the pump 60 is configured to be driven by the driving force of the driving device 50.

  The coolant tank 70 is a container in which coolant C such as water or lubricating liquid is stored, and is provided on the side of the bed 10. Between the bed 10 and the coolant tank 70, a pipe 71 for allowing the coolant C accumulated on the upper surface of the bed 10 to flow into the coolant tank 70 is provided.

One end of the suction pipe 81 is connected to the suction port 63 of the pump 60, and the other end is inserted into the coolant tank 70.
One end of the discharge pipe 82 is connected to the discharge port 64 of the pump 60, and the other end is disposed in the processing region 3. At the other end of the discharge pipe 82, a nozzle 82a for discharging the coolant C toward the upper surface 2c of the grinding wheel 2 is provided.

Next, the grinding method of the workpiece | work W using the above-mentioned machine tool 1 is demonstrated.
After the workpiece W is supported on the workpiece support surface 21a of the workpiece support device 20, the workpiece spindle 21 is rotated to rotate the workpiece W, and the drive device 50 is driven to rotate the tool spindle 30 and the grinding wheel 2. .

When the tool spindle 30 rotates, the inner rotor 61 of the pump 60 rotates, and the coolant C in the coolant tank 70 is sucked up to the pump 60 through the suction pipe 81, and the coolant C is supplied from the pump 60 to the discharge pipe 82.
The coolant C is discharged from the nozzle 82a to the upper surface 2c of the grinding wheel 2 and supplied to the lower surface 2b side of the grinding wheel 2 through the supply path 2e of the grinding wheel 2.

  The spindle head 40 is moved, the grindstone 2d is brought into contact with the upper surface of the workpiece W, and the upper surface of the workpiece W is ground. At this time, the coolant C that has flowed through the outer surfaces of the grindstone 2 d, the workpiece W, and the workpiece spindle 21 is collected from the upper surface of the bed 10 into the coolant tank 70 through the pipe 71.

  When the grinding of the workpiece W is completed, the spindle head 40 is moved to separate the grinding wheel 2 from the workpiece W. Further, the driving device 50 is stopped, and the rotation of the tool spindle 30 is stopped. As described above, when the rotation of the tool spindle 30 is stopped, the pump 60 is stopped and the supply of the coolant C to the machining region 3 is stopped.

In the machine tool 1 as described above, the pump 60 is driven by the driving device 50 for rotating the tool spindle 30. Therefore, when the rotation of the tool spindle 30 is stopped, the pump 60 is also stopped and the supply of the coolant C is stopped. That is, in the machine tool 1, the pump 60 is driven only when the workpiece W is processed, and the coolant C is supplied to the processing region 3.
Therefore, in the machine tool of the present invention, the heat generation of the pump is suppressed, and the supply / non-supply control of the coolant C to the machining area 3 is simplified. Further, since the amount of the coolant C circulating in the machine tool 1 is reduced, the storage amount of the coolant tank 7 can be reduced. Further, since the tool spindle 30 and the pump 60 are efficiently driven by the single driving device 50, the energy for driving the machine tool 1 can be reduced.

  Moreover, since the drive device 50 which is an electric motor is incorporated in the spindle head 40, the machine tool 1 can be reduced in size and weight.

  Further, since the trochoid pump 60 is used, the suction efficiency and the discharge efficiency of the pump 60 can be increased and noise can be suppressed.

The embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.
As shown in FIG. 1, the machine tool 1 of the present embodiment is a grinding device for grinding a workpiece W, but the type of tool attached to the tool spindle 30 is not limited. For example, the work W can be cut by attaching a cutting blade to the tool spindle 30. Further, a horizontal machine tool can be configured by arranging the tool spindle 30 sideways.

  The drive device 50 is not limited to an electric motor, and various drive devices can be used. Further, the driving device 50 may be provided on the outer surface of the spindle head 40.

DESCRIPTION OF SYMBOLS 1 Machine tool 2 Grinding wheel 2a Disk member 2d Wheel 2e Supply path 3 Processing area 10 Bed 20 Work support device 21 Work spindle 21a Work support surface 30 Tool spindle 40 Spindle head 44 Mounting hole 50 Drive device 51 Stator 52 Rotor 60 Pump 61 Inner rotor 62 Outer rotor 63 Suction port 64 Discharge port 65 Casing 70 Coolant tank 81 Suction pipe 82 Discharge pipe 82a Nozzle C Coolant W Workpiece

Claims (2)

A workpiece support device having a workpiece support surface for supporting the workpiece;
A tool spindle with removable tools,
A spindle head that rotatably supports the tool spindle;
A drive for rotating the tool spindle;
A pump fixed to the outer surface of the spindle head ;
A coolant tank in which coolant is stored;
One end is connected to the suction port of the pump, and the other end is a suction pipe connected to the coolant tank;
One end is connected to the discharge port of the pump, and the other end is provided with a discharge pipe disposed in the processing region of the workpiece,
The pump is a trochoid type,
An inner rotor of the pump is connected to the tool spindle,
A machine tool characterized in that the pump is driven when the rotational force of the tool spindle is transmitted to the pump. The driving device includes:
A stator provided in the spindle head;
The machine tool according to claim 1, wherein the machine tool is an electric motor having a rotor provided on the tool spindle.

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