JPH05342U - Spindle base cooling device - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the cooling efficiency in a spindle base that incorporates a motor rotor and a spindle integrally without the need for a high discharge pump. Also, it can be applied to a small flow passage forming space in the spindle base. [Structure] A plurality of spiral cooling liquid flow paths 11a and 11b are provided in a motor unit 1a of a spindle base 1 in which a rotor of a motor and a spindle 5 are integrally incorporated. The plurality of cooling liquid channels 11a and 11b have spiral-shaped peripheral portions arranged substantially alternately.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a built-in motor type spindle base cooling device for machine tools such as machining centers and lathes.

[0002]

[Prior Art]

 In recent years, in machine tools such as machining centers and lathes, a built-in motor type spindle base in which a motor and a spindle are integrated has been adopted in order to respond to higher spindle rotation speeds. However, if this method is adopted, heat generation of the bearing portion and heat generation of the motor portion are added, and thus countermeasures against thermal displacement become an important issue.

For this reason, conventionally, as shown in FIG. 5, a spindle base 51 has been proposed in which cooling motor jackets 54 and 55 are provided on a motor part 52 and a bearing part 53. These jackets 54 and 55 are designed to circulate the cooling liquid from separate cooling liquid cooling devices 56 and 57, respectively. In each of the jackets 54 and 55, one cooling liquid flow path is spirally arranged.

[0004]

[Problems to be solved by the device]

 In such a cooling device for the spindle base 51, particularly since the motor part 52 generates a large amount of heat, further improvement in cooling efficiency is desired. When attempting to improve the cooling efficiency, it is conceivable to increase the flow rate of the cooling liquid flowing through the cooling liquid flow paths of the jackets 54, 55 per unit time.

However, in such a method, since the pressure loss (flow path resistance) of the cooling liquid flow path increases, the pump provided in the cooling liquid cooling devices 56, 57 has a high discharge force accordingly. However, there is a problem that the cost must be increased significantly. To reduce the flow passage resistance, the cross-sectional area of the cooling liquid flow passage may be increased. However, for example, in the motor section 52, etc., it is necessary to secure a rotor space. Has a limit.

An object of the present invention is to provide a spindle base cooling device capable of improving cooling efficiency without requiring a high discharge pump and requiring a thin passage forming space.

[0007]

[Means for Solving the Problems]

 The configuration of the present invention will be described with reference to FIG. 1 corresponding to the embodiment. In this spindle base cooling device, a plurality of spiral cooling liquid flow passages (11a) are provided in a motor part (1a) of a spindle base (1) in which a motor rotor and a spindle (5) are integrally incorporated. , (11b) are provided. The plurality of cooling liquid flow paths (11a) and (11b) have spiral-shaped peripheral portions arranged substantially alternately.

[0008]

[Action]

 According to this configuration, since the motor section (1a) is provided with a plurality of cooling liquid flow paths (11a) and (11b), the cooling liquid flow rate per unit time is increased without increasing the flow path resistance, and the cooling efficiency is increased. Can be improved. Since the plurality of cooling liquid flow paths (11a) and (11b) have spiral-shaped peripheral portions arranged substantially alternately with each other, the entire motor section (1a) is cooled uniformly.

[0009]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. 2 is a perspective view showing an outline of a spindle base cooling device in a machining center, and FIG. 3 is a sectional view of a spindle base. The spindle base 1 serves as the spindle head of the machining center, and is installed so as to be able to move up and down with respect to the column 2 as shown in FIG. That is, a guide flange 3 protruding to the outer peripheral portion is formed at the front part of the spindle base 1, and the guide flange 3 is engaged with a rail 4 vertically provided on the front surface of the column 2 so as to be able to move up and down. ..

As shown in FIG. 3, the spindle base 1 supports a spindle 5 having a tool mounting hole 5a at its tip by a plurality of front bearings 6 and rear bearings 7, and a built-in type motor 8 is incorporated therein. Has been. The motor 8 is composed of a rotor 9 provided integrally with the spindle 5 and a stator 10 directly installed on the spindle base 1.

Cooling liquid jackets 11 and 12 are provided on a motor unit 1 a in which the motor 8 of the spindle base 1 is installed and a bearing unit 1 b in which the front bearing 6 is arranged. The jacket 11 of the motor part 1a is provided with two spiral flow paths 11a and 11b, and the jacket 12 of the bearing part 1b is provided with one spiral flow path 12a. Further, inlets 13, 14, 15 and outlets 16, 17, 18 are provided at both ends of each flow path 11a, 11b, 12a.

As shown in FIG. 1, the two flow paths 11a and 11b of the jacket 11 of the motor unit 1a are arranged such that their spiral peripheral portions are alternately arranged. Further, the inlets 13 and 14 of the two flow paths 11a and 11b are arranged on the front side of the spindle base 1, and the outlets 16 and 17 are arranged on the rear side thereof.

As shown in FIG. 2, a pipe support member 27 is connected to the guide flange 3 of the spindle base 1 so that it can be lifted up and down integrally with the spindle base 1. . In this pipe support member 27, the forward pipes 19a, 20a, 21a connected to the inlets 13, 14, 15 of the flow paths 11a, 11b, 12a of the spindle base 1 and the outlets 16, 17 of the flow paths 11a, 11b, 12a. The return pipes 22a, 23a, 24a connected to 18 are supported. The outward pipes 19a, 20a, 21a and the return pipes 22a, 23a, 24a are respectively connected to the pipes 19c, 20c, 21c, 22c of the pipe terminal 25 via the flexible pipes 19b, 20b, 21b, 22b, 23b, 24b. , 23c, 24c, and these pipes 19c-24c circulate the cooling liquid through the forward pipes 19d, 20d, 21d and the return pipes 22d, 23d, 24d to the respective flow passages 11a, 11b, 12a. It is connected to a cooling liquid cooling device 26 including a pump (not shown) for supplying.

The operation of the above configuration will be described. The cooling liquid discharged from the cooling liquid cooling device 26 is supplied to the respective flow paths 11a, 11b, 12a of the spindle base 1 through the following paths. That is, the cooling liquid is supplied from the cooling liquid cooling device 26 to one flow passage 11a of the jacket 11 in the motor portion 1a through the outward pipe 19d-the pipe 19c-the flexible pipe 19b-the outward pipe 19a. Further, the cooling liquid is supplied from the cooling liquid cooling device 26 to the other flow passage 11b of the jacket 11 in the motor portion 1a via the outward pipe 20d-the pipe 20c-the flexible pipe 20b-the outward pipe 20a. .. Further, the cooling liquid is supplied from the cooling liquid cooling device 26 to the flow passage 12a of the jacket 12 in the bearing portion 1b through the outward pipe 21d-the pipe 21c-the flexible pipe 21b-the outward pipe 21a.

On the other hand, the cooling liquid supplied to one flow passage 11a of the jacket 11 is recovered from the outlet 16 to the cooling liquid cooling device 26 via the return pipe 22a-flexible pipe 22b-pipe 22c-return pipe 22d. To be done. Further, the cooling liquid supplied to the other one flow passage 11b of the jacket 11 is recovered from the outlet 17 thereof to the cooling liquid cooling device 26 via the return pipe 23a-flexible pipe 23b-pipe 23c-return pipe 23c. It Further, the cooling liquid supplied to the flow passage 12a of the jacket 12 is recovered from the outlet 18 through the return pipe 24a-the flexible pipe 24b-the pipe 24c-the return pipe 24d to the cooling liquid cooling device 26.

Liquid supply pipes 19a to 21a and drainage pipes 22a to 24a of the pipe support member 27 and pipes 19c to 24c of the pipe terminal 25 are connected via flexible pipes 19c to 24c. Therefore, it is possible to move the spindle base 1 up and down without interfering with the circulating supply of the cooling liquid.

In this spindle base cooling device, since the cooling fluid passages 11a and 11b are provided in the jacket 11 of the motor unit 1a in this way, pressure loss when the flow rate is increased, that is, passage resistance is increased. This can be avoided, and therefore, the cooling liquid flow rate per unit time can be increased and the cooling efficiency can be improved without increasing the discharge output of the pump included in the cooling liquid cooling device 26. Further, since the flow passage cross-section is not increased but a plurality of flow passages are used, the thickness of the jacket 11 can be thin, and the flow passage forming space of the spindle base 1 can be reduced accordingly. Moreover, since the spiral-shaped peripheral portions of the plurality of cooling liquid flow paths 11a and 11b are arranged almost alternately with each other, the entire motor unit 1a is cooled uniformly. Although the bearing portion 1b has one cooling liquid passage 12a, the amount of heat generated by the bearing portion 1b is smaller than that of the motor portion 1a, so that one cooling liquid passage 12a is sufficient for cooling.

FIG. 4 is a perspective view showing a configuration of two flow paths 11a and 11b in the motor unit 1a of the spindle base 1 according to another embodiment of the present invention. In this embodiment, the inlet 13 of the one flow passage 11a is arranged at the front part of the spindle base 1 and the outlet 16 is arranged at the rear part thereof, and in this flow passage 11a, the cooling liquid is supplied from the front part to the rear part. On the other hand, the inlet 14 and the outlet 17 of the other flow passage 41b are arranged at the rear and the front, respectively, and the flow passage 11b is configured to supply the cooling liquid from the rear to the front. As a result, the cooling effect becomes uniform between the front part and the rear part of the motor unit 1a, and the cooling rate can be sufficiently increased.

[0019]

[Effect of the device]

 Since the spindle base cooling device of the present invention is provided with a plurality of cooling liquid flow paths in the motor part, the cooling liquid flow rate per unit time can be increased without increasing the flow path resistance to improve the cooling efficiency. You can Since a plurality of channels are used instead of enlarging the channel cross section, the channel forming space in the spindle base can be made thin. Moreover, since the spiral-shaped peripheral portions of the plurality of cooling liquid flow paths are arranged almost alternately with each other, the entire motor portion is cooled uniformly.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a conceptual configuration of an embodiment of the present invention.

FIG. 2 is a cutaway perspective view showing a schematic configuration of the embodiment.

FIG. 3 is a sectional view of the spindle base.

FIG. 4 is a perspective view showing a schematic configuration of another embodiment of the present invention.

FIG. 5 is an explanatory diagram of a configuration of a conventional example.

[Explanation of symbols]

1 ... Spindle base, 1a ... Motor part, 2 ... Column, 5 ...
Spindle, 6, 7 ... Bearing, 8 ... Motor, 9 ... Rotor,
11a, 11b ... spiral flow passage, 13, 14 ... inlet, 16, 17 ... outlet, 26 ... cooling liquid cooling device

Claims (1)

Claims for utility model registration: 1. In a spindle base in which a rotor and a spindle of a motor are integrally incorporated, the motor part of the spindle base is provided with a plurality of spiral cooling liquid passages,
These multiple cooling liquid passages are spindle base cooling devices in which spiral-shaped peripheral portions are arranged substantially alternately.