JPS58119744A - Motor built-in spindle base - Google Patents

Abstract

PURPOSE:To improve the heat dissipating effect of the surface of a stator by forming vent holes of suitable number at one end of a spindle base frame, and passing cooling air intorduced from the holes into air gaps through cooling air holes formed through a stator. CONSTITUTION:A spindle base frame 32 is arranged at an air gap 30 on the outer periphery of a stator 24 of a rotatably drive motor in a motor built-in spindle base, a cooling air passage which is formed, as shown by arrows, of an air hole 34 formed at the frame 32, an air gap 10, a cooling air hole 28 formed at the air hole forming part 24a of the stator 24, and the ventilating hole 38 of the frame 32 is provided, the outer periphery of the stator 24 is cooled by the cooling air which passes through the air gap 30, and a mechanism for cooling the interior of the stator 24 with the air passing through the hole 28 is formed. In this manner, the heat dissipating area of the heat from the motor can be increased, thereby improving the cooling effect.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a headstock of a machine tool.
-In regards to the improved structure of the cooling mechanism in the main spindle with a built-in main spindle of the machine tool, the stator is attached to the main spindle of the machine tool as described above. A motor-built-in headstock in which an AC motor is directly built-in is often used as a compact headstock.

In this type of headstock with a built-in motor, the heat generated from the rotary drive motor causes thermal deformation of the spindle and other mechanical elements, leading to deterioration of machining accuracy.
A large solid layer is used to absorb the generated heat and effectively cool the rotary drive motor.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a headstock with a built-in motor, which is configured to reduce the heat removal effect on the surface of the stator, which is a heat generation source of the motor, as an improved structure of the cooling mechanism of the headstock with a built-in motor.

According to the present invention, the rotor is mounted on a nine-rotating main shaft that is supported by a bearing, and the stator is mounted on a nine-rotation main shaft that is supported by a bearing.
In the headstock with a built-in ζO stator, an appropriate number of air holes are formed at one end of the O headstock frame with a cylindrical shape so as to surround the stator with a distance from the outer peripheral surface of the ζO stator. It is characterized by comprising a cooling mechanism in which the air is introduced into the above-mentioned gap portion from the air hole of the stator, passes through the air hole required for cooling, and passes through the air hole required for cooling. do"
A headstock with a built-in motor is provided. In addition, a fan is installed on the rear end of the main spindle of the ζO motor built-in headstock.
The above cooling mechanism Ks? It is designed to promote zero flow of cooling air (cooling air flow). Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

The figure is a sectional view showing an embodiment of the headstock with a built-in motor (AC cage) according to the present invention. In the figure, the main shaft 10 provided in the center has a tapered tip 12 to which a suitable cutting tool can be attached. As long as the section 12 is provided, and the front end and rear end are supported by bearings 14, 14 and 16, it is rotatable in K direction. The above-mentioned nine bearings 14
．． The 16th group is stored in the bearing box tsaeisb,
Further, a dustproof seal is provided by covers 20m and 20b.

At approximately the center of the main shaft 10 is a rotor 2 of a rotational drive motor.
2 is fixed in an immovable K11 manner in both the axial direction and the circumferential direction by suitable O11 attaching means. A stator 24 is disposed outside the rotor 22 so as to surround the rotor 22 via the rotor 22 and the rotor 22. The stator 24 with a suitable annular fixing means 26a and the stator 24
The air hole forming portion 24 is held at a constant position with respect to the rotor 22 in the axial direction and the circumferential direction. The air hole forming portion 24m is formed with an air hole 28 penetrating in the axial direction, and an appropriate number of these twisted air holes 28 are provided around the stator 24, for example, at four locations at 90° intervals. Therefore, the cross section below the central axis in the illustrated embodiment shows the cross section of the portion where the air hole forming portion 24m is not provided.

Now, around the stator 24, a headstock frame 32 is provided which forms a covering at a position separated by a gap 30 from the outer periphery of the above-mentioned air hole forming portion 24 and the outer periphery of the shell stator 24, respectively. This headstock 7 frame 32 has a buried cylinder shape, and is attached to a bearing box 18a at the tip of the main shaft 1O and a bearing box 18b at the rear end, and has a nine-piece structure.

Now, air holes 34 are formed at appropriate intervals in the circumferential direction in the bulge portion of this cylindrical headstock 7 frame 32, and cooling air is passed from the outside through these air holes 34 to the stator 24. It is formed so that it can flow into a cavity 30 extending in the axial direction. The cooling air or cooling wind that has flowed into the air space alaQ advances inside the headstock frame 32, and after being directed in the internal space 36 of the headstock frame 320, it flows back through the air holes 2s of the air hole forming portion 24a. It is formed on the rear surface of the headstock frame 320 in alignment with the vertical air hole 2, passes through the running hole 3, and is further attached to the rear end of the headstock 1, and is exposed to the outside by the suction action of the 977740. It is discharged. 42
is a wind hole kagei@2480 9 cooling air is circulated at various places with 4 fans
It is a duct pipe that leads to 0.

As described above, according to the present invention, there is a space on the outer periphery of the rotary drive M4-O stator 24 in the headstock with a built-in printer.
A headstock 7 frame 32 is arranged with the SO at a distance, and the 9 wind holes 34 are carved on this 07 frame 32, and the above-mentioned sky @so, stator 2
4 (9 cooling air holes formed in the D air hole forming part 24 and 7 above)
Frame 142K) Through the hole SBK, a cooling air return path is provided as shown by the arrow, and the outer periphery of the stay 24 is cooled by the cooling air passing through the gap 30, and the air hole 28 is Since a cooling mechanism is formed in which the inside of the stator 24 is also cooled by the passing air, the heat removal effect is improved by increasing the heat removal area for the heat generated by the motor, and therefore the heat removal effect is improved. achieved. Furthermore, the headstock frame 32 is shaped with a thermally conductive material so that the stator 2 is
4 and the air hole forming portion 24m are reduced, so that heat Il type of the axillary headstock frame 320 is also avoided.

By properly cooling the motor and the motor, thermal deformation of various mechanical elements in the headstock such as the main shaft 12 and bearings 14 and 16 can be avoided.

[Brief explanation of drawings]

The figure is a sectional view showing an embodiment of a headstock with a built-in motor according to the present invention. DESCRIPTION OF SYMBOLS 10--Main shaft, 14 e 16''-bearing, t2--Rotor, 24--Stator, 24a--Stator air hole forming part, 28--Cooling air hole, 3 G--... Gap, 32... Headstock frame, 34... Air hole, 40... Fan. Patent applicant: Fujitsu 7 Anatsuku Co., Ltd. Patent application agent: 1 patent attorney: Akira Aoki, patent attorney: Kazuyuki Nishidate, patent attorney: Kyosuke Tsuchinakayama Benunshi Akiyuki Yamaguchi

Claims (1)

[Claims] In a headstock with a built-in motor, the main shaft is supported by a bearing, and a stator is attached surrounding the ζO rotor.
A cylindrical headstock frame is provided that surrounds the stator through a gap with the outer circumferential surface of the stator, and the cold air introduced into the gap from the round air hole formed in the seven frames and one end is A headstock with a built-in motor, characterized in that a cooling mechanism is configured to allow cooling air to pass through cooling air holes formed through the stator outer circumferential surface and through the stator.