KR102030565B1

KR102030565B1 - The cooling structure of the machine tool

Info

Publication number: KR102030565B1
Application number: KR1020130121106A
Authority: KR
Inventors: 정석우
Original assignee: 두산공작기계 주식회사
Priority date: 2013-10-11
Filing date: 2013-10-11
Publication date: 2019-10-11
Also published as: KR20150042456A

Abstract

The present invention relates to a cooling structure of a machine tool including a front bearing and a rear bearing for supporting a spindle, a spindle motor for rotating the spindle, and a cooling portion for cooling the front bearing, the rear bearing, and the spindle motor. The cooling unit is formed on an outer circumferential surface of the first housing for supporting the front bearing, a front cooling flow path through which cooling fluid supplied from the outside flows, and is formed on an outer circumferential surface of a motor sleeve provided on an outer circumferential surface of the spindle motor. And a motor cooling passage through which the cooling fluid discharged from the front cooling passage flows, a rear cooling passage formed on one surface of the second housing supporting the rear bearing, and a cooling fluid discharged from the motor cooling passage flowing. It is formed in the rear end of the motor sleeve, the cooling discharged from the rear cooling passage Cooling structure of a machine tool comprising a recovery cooling passage through which a fluid flows.

Description

Cooling structure of machine tool {THE COOLING STRUCTURE OF THE MACHINE TOOL}

The present invention relates to a cooling structure of a machine tool, and more particularly to a cooling structure of a machine tool using a cooling fluid in order to solve the problems caused by heat generation in the rotating spindle.

As machine tools have become increasingly faster and more efficient, there has been an increase in the use of spindle motors to make spindles faster and achieve lower inertia.

Conventionally, when the spindle motor is attached separately, only the heat source for the heat deformation of the spindle is the main bearing, but as the speed increases, the spindle motor is being deformed into a built-in type in which the spindle motor is integrated with the spindle.

1 shows an assembly part of a conventional spindle motor embedded spindle, in which a spindle motor 14 having a rotor 12 and a stator 13 is disposed at a portion of the spindle 10, and the rotor 12 being a spindle. The stator 13 is mounted on the spindle housing 16.

As such, in the case of the built-in type in which the spindle motor 14 is integrated with the spindle 10, heat is gradually generated in the bearing housing 20 and the spindle housing 16 supporting the spindle bearing 18. A cooling device is added.

That is, referring to FIG. 1, after the cooling oil discharged from the oil pump 23 of the oil cooling device 22 is supplied through the oil passage 7a of the spindle housing 16, the outer circumferential surface of the bearing housing 20 and the spindle The cooling passages formed on the inner circumferential surface of the housing 16 and the cooling passages formed on the outer circumferential surface of the spindle housing 16 are sequentially cooled to recover the oil.

As described above, in the cooling structure of the conventional built-in spindle motor, a cooling flow path for suppressing the heat generation of the spindle is applied only to the spindle bearing 18 and the spindle motor 14, which are disposed at the front, so that the cooling passage is disposed at the rear, which is one of the heating parts. There was a problem that the supporting bearing 8 to be cooled could not be cooled.

Therefore, there is no way to prevent the heat from moving from the support bearing 8 to the spindle 10, there is a limit to the machining of high-precision workpieces, as well as causing processing failure of the workpiece.

The present invention is to solve the above problems, to provide a cooling structure of a machine tool in which a cooling flow path is formed not only in the front side bearing and the spindle motor of the spindle, but also in the rear end bearing of the spindle in order to suppress heat generation in the milling spindle and the like. It is to.

The technical problem to be achieved by the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

The present invention for achieving the above object is a machine tool including a front bearing and a rear bearing for supporting the spindle, a spindle motor for rotating the spindle, and a cooling unit for cooling the front bearing, the rear bearing and the spindle motor. In the cooling structure of the, The cooling unit is formed on the outer circumferential surface of the first housing for supporting the front bearing, the front cooling passage for the cooling fluid supplied from the outside flow; A motor cooling flow path formed on an outer circumferential surface of a motor sleeve provided on an outer circumferential surface of the spindle motor and in which cooling fluid discharged from the front cooling flow path flows; A rear cooling flow path formed on one surface of the second housing supporting the rear bearing and through which cooling fluid discharged from the motor cooling flow path flows; And a recovery cooling flow path formed at a rear end of the motor sleeve and through which cooling fluid discharged from the rear cooling flow path flows. It includes.

The motor cooling flow path is formed along a spiral first rib formed in a predetermined length from one end of the outer circumferential surface of the motor sleeve to the other end, and the recovery cooling flow path is predetermined at the other end of the outer circumferential surface of the motor sleeve. It is characterized by being formed by a pair of second ribs spaced apart from each other.

The rear cooling passage may further include a flow groove formed along a circumference of a hollow formed at the center of the second housing, a supply passage communicating the other surface of the second housing with the flow groove, and the supply passage. And a boss provided on the flow groove so as to be disposed between the other side of the second housing and the flow groove to be spaced apart from each other, and between the supply path and an end of the discharge path. .

On the other hand, the cooling structure of the machine tool, the rear flange is provided on one surface of the second housing to seal the flow groove; Further comprising a, one side of the rear flange is formed between the sealing passage between the pair of sealing member, characterized in that the sealing passage is disposed to face the flow groove.

According to the present invention, the cooling flow path applied to the machine tool is formed to pass through the front side bearing of the spindle, the spindle motor and the rear end bearing of the spindle, thereby suppressing heat generation in all parts of the spindle to reduce the machining failure rate of the workpiece This has the advantage of being able to machine high precision workpieces.

1 is a side cross-sectional view showing a machine tool having a spindle motor of a conventional built-in type.
2 is a perspective view showing a front end of a machine tool according to an embodiment of the present invention.
3 is a side cross-sectional view showing a main portion of a front end of a machine tool according to an embodiment of the present invention.
4 is a perspective view showing a first housing of a machine tool according to an embodiment of the present invention.
Figure 5 is a side cross-sectional view showing a motor cooling passage of the machine tool according to an embodiment of the present invention.
6 is a perspective view showing a motor sleeve of a machine tool according to an embodiment of the present invention.
7 is a side cross-sectional view showing a motor sleeve of a machine tool according to an embodiment of the present invention.
8 is a side cross-sectional view showing the main part of the rear end of the machine tool according to an embodiment of the present invention.
9 is a front perspective view showing a second housing of a machine tool according to an embodiment of the present invention.
10 is a side perspective view showing a second housing of a machine tool according to an embodiment of the present invention.
11 is a rear perspective view illustrating a second housing of a machine tool according to an embodiment of the present invention.
12 is a front perspective view of a rear flange of a machine tool according to an embodiment of the present invention.
13 and 14 are side cross-sectional views showing a recovery cooling flow path of a machine tool according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this process, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms that are specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. Definitions of these terms should be made based on the contents throughout the specification. And the spirit of the present invention is not limited to the embodiments presented, those skilled in the art of understanding the spirit of the present invention can easily implement other embodiments within the scope of the same idea, but also within the scope of the present invention Of course.

Figure 2 is a perspective view showing a front end of a machine tool according to an embodiment of the present invention, Figure 3 is a side cross-sectional view showing a major part of the front end of a machine tool according to an embodiment of the present invention, Figure 4 is A perspective view of a first housing of a machine tool according to an embodiment. The structure of the front cooling flow path of the cooling part of the cooling structure of the machine tool of this invention is demonstrated in detail with reference to FIGS.

Referring to FIG. 2, a first housing 110 having a hollow ring shape is provided at a front end side of a body 60 forming an external shape of a machine tool, and the cooling fluid supplied from the outside is the first housing 110. It moves along the front cooling passage 100 formed on the outer peripheral surface of the.

That is, a supply flow passage 61 for supplying a cooling fluid from the outside to the front cooling passage 100 is provided at the lower side of the front side of the body 60, and the front cooling passage at the upper side of the front side of the body 60. A first connection flow path 63 is provided to supply the motor cooling flow path 200 (refer to FIG. 5), which will be described later, to flow the cooling fluid 100, and the cooling fluid supplied to the supply flow path 61 is the front cooling flow path. After flowing 100, the heat source generated in the front bearing 30 is removed by being supplied to the motor cooling channel 200 through the first connection channel 63.

Specifically, referring to FIGS. 3 and 4, the first housing 110 is for supporting the front bearing 30 supporting the front end of the spindle 10 and has a pair of front bearings 30 on the inner circumferential surface thereof. Is provided.

According to an embodiment of the present invention, the outer circumferential surface of the first housing 110 is formed in multiple stages, and the front side of the body 60 supporting the outer circumferential portion of the step 112 and the first housing 110. The front cooling passage 100 is formed between the stepped portions 62.

The sealing groove 116 is formed to be adjacent to one side of the front cooling passage 100 of the first housing 110, and the sealing groove 116 is inserted into a sealing member 114 such as an O-ring to cool the front. The flow path 100 is sealed to prevent leakage of the cooling fluid.

Figure 5 is a side cross-sectional view showing a motor cooling passage of the machine tool according to an embodiment of the present invention, Figures 6 and 7 are a perspective view and a side cross-sectional view showing a motor sleeve of the machine tool according to an embodiment of the present invention. The structure of the motor cooling flow path among the cooling parts of the cooling structure of the machine tool of this invention is demonstrated in detail with reference to FIGS.

Referring to FIG. 5, the spindle motor 20 is configured to rotate the spindle 10 and includes a rotor 22 and a stator 24, and the rotor 22 is disposed on an outer circumference of the spindle 10. The stator 24 is mounted on the inner circumferential surface of the motor sleeve 50.

A motor sleeve 50 is provided on an outer circumferential surface of the spindle motor 20, and a motor cooling flow path 200 is formed between the outer circumferential surface of the motor sleeve 50 and the stop side inner circumferential surface of the body 60.

That is, the cooling fluid flowing through the front cooling channel 100 is supplied from the first connection channel 63 to one end of the outer circumferential surface of the motor sleeve 50, and the supplied cooling fluid is supplied to the motor sleeve 50. The heat source generated in the spindle motor 20 is removed by flowing in the spiral direction toward the other end.

Specifically, referring to FIGS. 6 and 7, the motor sleeve 50 is formed in a cylindrical shape in which the inside of the motor sleeve 50 is opened to have a predetermined length, and the first rib 210 is formed on the outer circumferential surface in a spiral direction from one end to the other end thereof. ) Is provided, wherein the motor cooling channel 200 is formed between the first rib 210 having a spiral shape and an inner circumferential surface of the stop side of the body 60.

The cooling fluid flowing through the motor cooling passage 200 is supplied to the rear cooling passage 300 to be described later through the second connection passage 65 formed at the rear end of the motor sleeve 50.

8 is a side cross-sectional view showing the main part of the rear end of the machine tool according to an embodiment of the present invention, Figures 9 to 11 is a front perspective view, cross-sectional view showing a second housing of the machine tool according to an embodiment of the present invention Is a perspective view and a rear perspective view, and FIG. 12 is a front perspective view of a rear flange of a machine tool according to an embodiment of the present invention. The structure of the rear cooling flow path among the cooling parts of the cooling structure of the machine tool of this invention is demonstrated in detail with reference to FIGS. 9-12.

Referring to FIG. 8, a second housing 310 is provided at the rear end side of the spindle 10, and the second housing 310 has a rear bearing 40 supporting the rear end of the spindle 10 at an inner circumferential surface thereof. Support.

The rear cooling passage 300 is formed on one surface of the second housing 310 and communicates with the second connection passage 65 to receive the cooling fluid discharged after flowing the motor cooling passage 200. After removing the heat source generated in the rear bearing 40, the cooling fluid is discharged to the recovery cooling passage 400 to be described later through the third connecting passage (67).

Specifically, referring to FIGS. 9 to 11, the rear cooling passage 300 includes a flow groove 320, a supply passage 330, a discharge passage 340, a boss 350, and the like.

The flow groove 320 is formed on one surface of the second housing 310 along the circumference of the hollow formed in the center of the second housing 310, by the cooling fluid flowing through the flow groove 320 The heat source generated in the rear bearing 40 is removed.

The supply path 330 is provided inside the second housing 310 so as to communicate the other surface of the second housing 310 with the flow groove 320, and the supply hole of the supply path 330 ( 332 is connected to the second connection passage 65 on the other surface of the second housing 310.

Therefore, the cooling fluid flowing through the motor cooling passage 200 flows into the flow groove 320 after being introduced into the supply passage 330 through the supply opening 332.

The discharge passage 340 communicates with the other surface of the second housing 310 and the flow groove 320 like the supply passage 330, and is spaced apart from the supply passage 330 by a predetermined interval. It is provided inside the 310. In addition, the outlet 342 of the discharge passage 340 is connected to the third connection passage 67 on the other surface of the second housing 310.

Therefore, the cooling fluid which removes the heat source of the rear bearing 40 while flowing the flow groove 320 is discharged to the discharge port 342 through the discharge path 340, the third connecting flow path 67 It is supplied to the recovery cooling passage 400 through.

Referring to FIG. 11, the boss 350 is provided on the flow groove 320 to be disposed between the supply path 330 and the end of the discharge path 340, and through the supply path 330. The flow path is divided so that the cooling fluid supplied to the flow groove 320 and the flow groove 320 flow after the cooling fluid discharged through the discharge path 330 are not mixed with each other.

Referring to FIG. 12, the machine tool according to the embodiment of the present invention further includes a rear flange 500, and the rear flange 500 includes the second housing to seal the flow groove 320. 310 is provided on one surface.

That is, a pair of grooves 522 are formed on one surface of the rear flange 500, and the pair of grooves 522 is provided with a sealing member 520 such as an O-ring, and the pair of sealing members 520. An airtight passage 510 formed therebetween is disposed to face the flow groove 320 to seal the flow groove 320 as shown in FIGS. 8 and 10.

The cooling fluid flowing through the rear cooling channel 300 is supplied to the recovery cooling channel 300 to be described later through the third connection channel 67 formed at the rear end of the motor sleeve 50.

13 and 14 are side cross-sectional views showing a recovery cooling flow path of a machine tool according to an embodiment of the present invention. With reference to FIG. 13 and FIG. 14, the structure of the recovery cooling flow path in the cooling part of the cooling structure of the machine tool of this invention is demonstrated in detail.

Referring to FIG. 13, which is a side cross-sectional view showing an upper portion of the rear end side of the spindle 10, the cooling fluid discharged through the discharge passage 330 of the rear cooling passage 300 is connected to the third connection passage 67. The recovery cooling passage 400 is provided at the rear end of the motor sleeve 50.

Specifically, the recovery cooling flow path 400 is formed between the pair of second ribs 410 formed at the other end of the outer circumferential surface of the motor sleeve 50 and a rear end side inner circumferential surface of the body 60. 6 and 7, the cooling fluid flowing through the recovery cooling channel 400 removes the heat source generated in the spindle motor 20 once again.

Referring to FIG. 14, which is a side cross-sectional view showing a lower rear end side of the spindle 10, the cooling fluid flowing through the recovery cooling flow path 400 communicates with the recovery cooling flow path 400 to the outside. Through the discharged to the outside of the body 60.

The reason for forming the motor cooling passage 200 and the recovery cooling passage 400 separately from the outer circumferential surface of the motor sleeve 50 is that the rear cooling passage after the motor cooling passage 200 flows ( This is to prevent the mixing of the cooling fluid flowing into the 300 and the cooling liquid discharged to the outside after flowing the rear cooling passage 300, and to increase the efficiency of the removal of the heat source generated in the spindle motor 20. .

Overall looking at the movement path of the cooling fluid flowing along the cooling structure of the machine tool according to an embodiment of the present invention, the cooling fluid supplied from the outside flows to the front cooling passage 100 through the supply passage 61 To remove the heat source generated from the front bearing (30).

The cooling fluid flowing through the front cooling passage 100 is supplied to the motor cooling passage 200 through the first connection passage 63, and the cooling fluid flowing through the motor cooling passage 200 is the spindle motor. The heat source generated at 20 is removed.

The cooling fluid flowing through the motor cooling passage 200 is supplied to the rear cooling passage 300 through the second connection passage 65, and the cooling fluid flowing through the rear cooling passage 300 is the rear bearing. The heat source generated at 40 is removed.

The cooling fluid flowing through the rear cooling passage 300 is supplied to the recovery cooling passage 400 through the third connection passage 67, and the cooling fluid flowing through the recovery cooling passage 400 is the spindle motor. After the heat source generated at 20 is once again removed, it is discharged to the outside through the discharge passage 69.

Here, the cooling fluid discharged to the outside is cooled and supplied to the front cooling passage 100 through the supply passage 61 so that the cooling fluid circulates through the cooling passages according to the exemplary embodiment of the present invention.

Although embodiments according to the present invention have been described above, these are merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments of the present invention are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the following claims.

10: spindle 20: spindle motor
30: front bearing 40: rear bearing
50: motor sleeve 100: front cooling passage
110: first housing 200: motor cooling flow path
210: first rib 300: rear cooling flow path
310: second housing 320: flow groove
330: supply passage 340: discharge passage
350: boss 400: recovery cooling flow path
410: second rib 500: rear flange
510: sealing passage 520: sealing member

Claims

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A cooling structure of a machine tool comprising a front bearing and a rear bearing supporting a spindle, a spindle motor for rotating the spindle, and a cooling unit for cooling the front bearing, the rear bearing, and the spindle motor.
The cooling unit,
A front cooling passage formed on an outer circumferential surface of the first housing for supporting the front bearing and through which a cooling fluid supplied from the outside flows;
A motor cooling passage formed on an outer circumferential surface of a motor sleeve provided on an outer circumferential surface of the spindle motor and having a cooling fluid discharged from the front cooling passage;
A rear cooling flow path formed on one surface of the second housing supporting the rear bearing and through which cooling fluid discharged from the motor cooling flow path flows; And
A recovery cooling flow path formed at a rear end of the motor sleeve and through which cooling fluid discharged from the rear cooling flow path flows; Including,
The motor cooling channel is formed along a spiral first rib formed in a predetermined length from one end of the outer circumferential surface of the motor sleeve toward the other end,
The recovery cooling passage is formed by a pair of second ribs which are formed at the other end of the outer circumferential surface of the motor sleeve to be spaced apart by a predetermined interval.

A cooling structure of a machine tool comprising a front bearing and a rear bearing supporting a spindle, a spindle motor for rotating the spindle, and a cooling unit for cooling the front bearing, the rear bearing, and the spindle motor.
The cooling unit,
A front cooling passage formed on an outer circumferential surface of the first housing for supporting the front bearing and through which a cooling fluid supplied from the outside flows;
A motor cooling passage formed on an outer circumferential surface of a motor sleeve provided on an outer circumferential surface of the spindle motor and having a cooling fluid discharged from the front cooling passage;
A rear cooling flow path formed on one surface of the second housing supporting the rear bearing and through which cooling fluid discharged from the motor cooling flow path flows; And
A recovery cooling flow path formed at a rear end of the motor sleeve and through which cooling fluid discharged from the rear cooling flow path flows; Including,
The rear cooling passage,
A flow groove formed along a circumference of the hollow formed at the center of the second housing;
A supply passage communicating the other surface of the second housing with the flow groove;
A discharge path communicating the other surface of the second housing with the flow groove spaced apart from the supply path by a predetermined interval;
And a boss provided on the flow groove so as to be disposed between the supply passage and the end of the discharge passage.

The method of claim 3,
A rear flange provided on one surface of the second housing to seal the flow groove; More,
Cooling structure of the machine tool, characterized in that the sealing channel is formed between a pair of sealing members on one surface of the rear flange, the sealing channel is disposed facing the flow groove.