TW201330968A - Cooling device for machine tool - Google Patents

Abstract

Provided is a cooling device for a machine tool that achieves a reduction in the size and the cost of the machine tool. This cooling device (1), which is for cooling the main shaft in a machine tool equipped with a coolant tank (grinding liquid tank (11)) that holds a coolant (grinding liquid (L1)) supplied to a workpiece-processing unit, and a coolant cooler (grinding liquid cooler (12)) that cools the coolant (L1), is characterized by being equipped with a cooling liquid flow path (31) in which a cooling liquid (L2) for cooling a motor (built-in motor (3)) for the main shaft flows, a cooling liquid tank (32) that holds the cooling liquid (L2), and a pump (33) that pumps the cooling liquid (L2), with the cooling liquid tank (32) being arranged within the coolant tank (11), and the coolant flow path (the grinding liquid flow path (13)) in which the coolant (L1); flows and the cooling liquid flow path (31) in which the cooling liquid (L2) flows being provided by means of separate lines.

Description

Cooling device for machine tool

The invention relates to a cooling device for a machine tool.

In the machine tool, for example, as disclosed in Patent Document 1, a spindle cooling device for cooling the main shaft is provided. The spindle cooling device has a flow path through which a coolant for cooling the spindle motor, a pump through which the coolant flows, and a cooler to cool the coolant.

Further, in the machine tool, a coolant cooling circulation device that cools the circulating coolant may be provided. The coolant cooling circulation device has a coolant tank provided below the workpiece processing portion, a coolant cooler that cools the coolant, and a supply flow path that sucks the coolant from the tank to be supplied to the workpiece processing portion.

[First technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2002-36066

The cooler of the aforementioned spindle cooling device also requires a tank for storing the coolant, so that a large installation place is required, and the cooler body is also expensive and requires a lot of cost. In addition, when the spindle cooling device and the coolant cooling circulation device are provided at the same time, the coolant supplied to the workpiece processing portion is mixed with chips, so that it cannot be used as both the coolant and the coolant, and may be cooled. The device must also be set to another system, requiring a larger setup and cost.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a cooling device for a power tool that can achieve a reduction in size and cost of a power tool.

In order to solve the aforementioned problems, the present invention is a cooling device for a machine tool for cooling a main shaft in a machine tool, the tool machine having: a coolant tank for storing a coolant supplied to a workpiece processing portion; and a coolant cooler Cooling the coolant, characterized in that it has a coolant flow path through which a coolant for cooling the spindle motor, a coolant tank for storing the coolant, and a pump for pumping the coolant; the cooling The liquid tank is disposed in the coolant tank, and the coolant flow path through the coolant and the coolant flow path through the coolant are provided in different systems.

When such a configuration is used, the coolant passes through the coolant tank and is cooled by the cooled coolant, whereby the cooler for cooling the coolant can be shared with the coolant cooler, so that it is not necessary to provide a coolant A dedicated cooler can reduce the cost of installation and cost, and achieve the miniaturization and cost reduction of the machine tool. Further, since the coolant flows through another system different from the coolant, the chips do not mix into the coolant.

In the invention of claim 2, a part of the coolant flow path is disposed so as to pass through the coolant tank. When such a configuration is used, the cooling efficiency of the coolant can be further improved.

When the present invention is used, the miniaturization and lowness of the achievable machine tool can be achieved. The excellent effect of cost.

Hereinafter, a cooling device for a machine tool according to an embodiment of the present invention will be described. In the present embodiment, a coolant-based polishing liquid is exemplified, and a case where a machine tool (grinder) having a built-in motor is provided on the main shaft is used. Moreover, it is not intended to limit the machine tool to the grinding machine. Moreover, it is not intended to limit the motor for the spindle to the built-in motor.

As shown in Fig. 1, the cooling device 1 of the machine tool according to the present embodiment has a polishing liquid pipe (coolant pipe) 10 for cooling the workpiece to be processed, and a coolant pipe 30 for cooling. A motor 3 is built in the motor for the spindle of the spindle 2.

The slurry line 10 has a slurry tank (coolant tank) 11 for storing the slurry L1 (coolant), a slurry cooler (coolant cooler) 12, a cooling slurry L1, and a slurry flow path (cooling) The agent flow path 13 flows through the polishing liquid L1.

The polishing liquid tank 11 is provided below the workpiece processing portion and has a large volume. The polishing liquid cooler 12 is for cooling the polishing liquid L1, and includes a compressor, a condenser (not shown), and a cooling unit 14. The cooling unit 14 is provided so as to protrude downward, and is immersed in the polishing liquid L1 stored in the polishing liquid tank 11. Further, the polishing liquid cooler 12 is not limited to the immersion method, and may be a circulation method in which the circulating polishing liquid L1 is circulated in the cooler.

The polishing liquid flow path 13 extends from the inside of the polishing liquid tank 11 to the vicinity of the workpiece processing portion, and the polishing liquid L1 is blown from the tip end portion 13b to the workpiece. In the slurry The flow path 13 is provided with a pump 15 and an on-off valve 16 that pressurize the slurry L1. The on-off valve 16 is opened to actuate the pump 15, whereby the slurry L1 is supplied to the workpiece processing portion. Further, a cyclone separating device 17 is provided in the polishing liquid flow path 13. The cyclone separation device 17 rotates the polishing liquid L1 to centrifugally separate objects such as chips from the polishing liquid L1. A groove circulation flow path 18 is provided in the polishing liquid flow path 13 in a divergent manner. The tank circulation flow path 18 causes the polishing liquid L1 to flow through the polishing liquid cooler 12 at a position farther from the polishing liquid cooler 12 than the polishing liquid L1 suction opening 13a, thereby circulating and stirring the polishing liquid L1 in the polishing liquid tank 11. A circulation on-off valve 19 is provided in the tank circulation flow path 18. While the circulation on-off valve 19 is opened, the on-off valve 16 is closed to actuate the pump 15, whereby the polishing liquid L1 flows in the tank circulation flow path 18. Thereby, the polishing liquid L1 in the polishing liquid tank 11 is circulated and stirred, and the cooling efficiency can be improved.

The coolant line 30 has a coolant flow path 31 through which the coolant L2 flows, a coolant tank 32 that stores the coolant L2, and a coolant pump 33 that pressurizes the coolant L2. The coolant line 30 is closed.

The coolant flow path 31 has a first flow path 34 through which the cooling liquid L2 flows from the cooling liquid tank 32 to the built-in motor 3, and a second flow path 35 to return the cooling liquid L2 from the built-in motor 3 to the cooling liquid tank. 32. The first flow path 34 and the second flow path 35 are respectively piped between the coolant liquid tank 32 and the built-in motor 3 . The coolant L2 supplied through the first flow path 34 passes through the cooling interlayer of the stator of the built-in motor 3 to cool the built-in motor 3, and then passes through the second flow path 35 to return to the coolant tank 32. The coolant L2 is used as a rust preventive property. The coolant flow path 31 is different from the polishing liquid flow path 13 such that the coolant L2 inside thereof is not mixed with the polishing liquid L1 in the polishing liquid tank 11.

The coolant tank 32 is disposed in the polishing liquid tank 11. The coolant tank 32 is disposed such that the lower portion thereof is immersed in the inside of the polishing liquid L1 stored in the polishing liquid tank 11. The coolant tank 32 is provided in the vicinity of the cooling portion 14 of the slurry cooler 12. The coolant L2 stored in the coolant tank 32 is separated from the slurry L1 by the outer casing of the coolant tank. The first flow path 34 and the second flow path 35 are connected to the coolant tank 11, respectively.

The first flow path 34 is provided with a coolant pump 33 for pumping the coolant L2 and a coolant switching valve 36. The coolant switching valve 36 is opened to actuate the coolant pump 33, whereby the coolant L2 is supplied to the built-in motor 3. The first flow path 34 is constructed such that a part thereof passes through the slurry tank 11. The portion of the first flow path 34 that passes through the polishing liquid tank 11 serves as the heat exchanger 37, and the polishing liquid L1 cools the cooling liquid L2 in the first flow path 34. The piping of the heat exchanger 37 is preferably provided with, for example, heat radiating fins to improve heat exchange efficiency.

When the cooling device 1 of the power tool constructed as described above is used, the cooling liquid L2 is cooled by the polishing liquid L1 when stored in the cooling liquid tank 32. When the slurry L1 is stored in the slurry tank 11, it is cooled by the slurry cooler 12. In other words, since the polishing liquid cooler 12 can not only cool the polishing liquid L1 but also cool the cooling liquid L2, the cooler for cooling the cooling liquid L2 can be shared with the polishing liquid cooler 12 for cooling the polishing liquid L1. Therefore, it is possible to reduce the size and cost of the machine tool without the need to provide a coolant-specific cooler, and it is possible to achieve miniaturization and cost reduction of the machine tool.

Since the coolant tank 32 is provided in the vicinity of the cooling portion 14 of the polishing liquid cooler 12, the cooling effect of the coolant L2 can be improved.

Moreover, the slurry line 10 and the coolant line 30 are set to be different Since the coolant L2 is not mixed with the polishing liquid L1, the chips in the polishing liquid L1 are not mixed into the coolant L2.

One part of the first flow path 34 of the coolant line 30 is configured to pass through the inside of the polishing liquid tank 11, so that the coolant L2 in the first flow path 34 is further cooled by the polishing liquid L1, so that Improve cooling efficiency.

The embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment, and it is needless to say that the design can be appropriately changed without departing from the scope of the present invention. For example, in the above embodiment, the heat exchange portion 37 of the coolant line 30 is provided as one of the first channels 34 as the coolant L2, but may be provided as the second of the return path. Flow path 35.

Further, in the above embodiment, the supercooled liquid line 30 is described as being used for cooling the built-in motor 3 for the main shaft. However, the present invention is also applicable to the cooling of the other portion of the coolant line. Further, of course, in addition to the built-in motor 3, it is also possible to cool a normal motor.

1‧‧‧Cooling device

2‧‧‧ Spindle

3‧‧‧ Built-in motor

11‧‧‧ polishing bath (coolant tank)

12‧‧‧Slurry cooler (coolant cooler)

13‧‧‧Dry slurry flow path (coolant flow path)

31‧‧‧ Coolant flow path

32‧‧‧ coolant tank

L1‧‧‧ polishing liquid (coolant)

L2‧‧‧ Coolant

Fig. 1 is a view showing the overall configuration of a cooling device for a machine tool according to an embodiment of the present invention.

1‧‧‧Cooling device

2‧‧‧ Spindle

3‧‧‧ Built-in motor

10‧‧‧Drying fluid pipeline (coolant piping)

11‧‧‧ polishing bath (coolant tank)

12‧‧‧Slurry cooler (coolant cooler)

13‧‧‧Dry slurry flow path (coolant flow path)

13a‧‧‧Sucking mouth

13b‧‧‧ tip

14‧‧‧Department of Cooling

15‧‧‧

16‧‧‧ switch valve

17‧‧‧Cyclone separation device

18‧‧‧Slot circulation flow path

19‧‧‧Circulation on/off valve

30‧‧‧ coolant line

31‧‧‧ Coolant flow path

32‧‧‧ coolant tank

33‧‧‧Cooling pump

34‧‧‧1st flow path

35‧‧‧2nd flow path

36‧‧‧Circulating valve for coolant

37‧‧‧ heat exchanger

L1‧‧‧ polishing liquid (coolant)

L2‧‧‧ Coolant

Claims (2)

A cooling device for a machine tool for cooling a main shaft in a machine tool, the tool machine having: a coolant tank for storing a coolant supplied to the workpiece processing portion; and a coolant cooler for cooling the coolant, the characteristics thereof The invention comprises: a coolant flow path through a coolant for cooling a spindle motor; a coolant tank for storing the coolant; and a pump for pumping the coolant, wherein the coolant tank is disposed in the coolant In the tank, the coolant flow path through which the coolant flows and the coolant flow path through which the coolant flows are set to be different systems. A cooling device for a power tool according to claim 1, wherein a part of the coolant flow path is disposed to pass through the coolant tank.