JPH08300239A - Built-in motor type spindle unit - Google Patents

Abstract

PURPOSE: To simplify a piping structure by reducing the number of air supplying and exhausting pipelines in an air-cooled built-in motor type spindle unit. CONSTITUTION: A flow of cleaning air out of a taper hole 23 to be fed by a cleaning air supplying hole 57 is conducted to a motor case 63 from a vent hole 75, thereby cooling a spindle driving motor 73 to be built in a spindle housing 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a build-in motor type spindle device used in a machine tool or the like, and more particularly to a build-in motor type spindle device provided with a blow-off type taper surface cleaning mechanism and a structure for air-cooling a motor part. It is a thing.

[0002]

2. Description of the Related Art A built-in motor type spindle device has a hollow spindle which is rotatably supported by a spindle housing, and a stator of a spindle driving motor is mounted in a motor chamber inside the spindle housing. A rotor of the spindle driving motor is attached to an outer peripheral portion of the spindle in the chamber, and the spindle is directly rotated by the spindle driving motor built in the spindle housing.

In many cases, such as those in the above-described build-in-motor type spindle device, spindles to which tools are automatically attached and detached by an automatic tool changer are equipped with a tool mounting taper for receiving a taper shank portion of the tool. It has a hole and a collet type tool clamp chuck in the hollow part and an operation bar that opens and closes the chuck so that it can move in the axial direction. The pressure cylinder device pushes the operating bar against the spring force of the clamp spring to open the tool clamping chuck.

As described above, in the spindle in which the tool is automatically detachably mounted by the automatic tool changer, the cleaning air passage hole opened toward the tool mounting taper hole is formed through the operation bar in the axial direction. Then, a cleaning air supply hole which is aligned with the cleaning air passage hole is formed in the piston member of the chuck opening / closing fluid pressure cylinder device facing the rear end of the main shaft housing. By supplying the cleaning air to the tool mounting taper hole from the tip of the cleaning air passage hole, the cleaning air blows off the taper surface of the tool mounting taper hole when changing tools. It has been traditionally done to clean.

In the built-in motor type spindle device, cooling air is individually supplied to the front and rear portions of the stator in the motor chamber in order to cool the spindle driving motor built in the spindle housing, and the stator is cooled. The cooling air supplied to the front and rear parts is individually exhausted from exhaust holes provided in the front and rear parts of the stator.

[0006]

In the build-in motor type spindle device having the blow-off type tapered surface cleaning mechanism and the air-cooling mechanism for the spindle driving motor as described above, the number of pipes is large due to the air supply / discharge pipes. However, there is a drawback that the piping structure becomes complicated. When the number of pipes is large and the pipe structure is complicated, the number of assembling steps of the build-in motor type spindle device including these pipes increases, the overall size increases, and the maintainability also deteriorates.

The present invention has been made in view of the above-mentioned problems, and a build-in motor type spindle device having a blow-off type tapered surface cleaning mechanism and an air-cooling mechanism for a spindle driving motor is provided in comparison with a conventional one. Therefore, it is an object of the present invention to provide a build-in motor type spindle device having a simple piping structure with a small number of pipes for supplying and discharging air.

[0008]

In order to achieve the above-mentioned object, a build-in motor type spindle device according to a first aspect of the present invention has a hollow spindle-shaped spindle rotatably supported by a spindle housing. A tool mounting taper hole for receiving the taper shank portion of the tool is provided at the tip end of the tool, and a tool clamping chuck and an operation bar for opening and closing the chuck are provided movably in the axial direction in the hollow part of the spindle. A cleaning air passage hole opened toward the tool mounting taper hole is formed through the operation bar in the axial direction, and a fluid pressure cylinder device for opening and closing the chuck is installed at the rear end of the spindle housing. Cleaning in which a piston member of a cylinder device faces a rear end portion of the operation bar and is aligned with the cleaning air passage hole in the piston member. Build-in motor type spindle in which an air supply hole is formed, a stator of a spindle driving motor is attached to a motor chamber inside the spindle housing, and a rotor of the spindle driving motor is attached to an outer peripheral portion of the spindle in the motor chamber. In the apparatus, the piston member is separated from the rear end of the operation bar at a rear position to close the tool clamping chuck to open the cleaning air supply hole into the main shaft housing, and the main shaft housing is provided with the cleaning member. An air passage for guiding cleaning air to the motor chamber is defined by the cleaning air supply hole, and an air discharge hole for discharging cleaning air from the motor chamber is formed in the main shaft housing.

A build-in motor type spindle device according to a second aspect is the build-in motor type spindle device according to the first aspect, wherein the motor chamber supports an outer ring holding member of a rear bearing member for supporting a rear portion of the main shaft to fix the main shaft housing. Separated from the rear end, the cleaning air supply hole is opened to a rear housing chamber defined between the outer ring holding member and the rear end of the spindle housing, and the outer ring holding member is connected to the motor chamber. A ventilation hole that communicates with the rear housing chamber is formed so as to penetrate therethrough, and the air discharge hole is formed on the opposite side of the outer ring holding member with the arrangement portion of the stator and the rotor separated. There is.

[0010]

In the built-in motor type spindle device according to the first aspect, when the piston member of the fluid pressure cylinder device pushes the operation bar to open the tool clamping chuck, when the tool is replaced, the cleaning air supply hole of the piston member is provided as in the conventional case. The supplied cleaning air flows axially through the cleaning air passage hole of the operation bar, blows out from the tip of the cleaning air passage hole into the tool mounting taper hole, and blows off the taper surface of the tool mounting taper hole. To clean.

When the spindle is driven to rotate by the spindle rotation driving motor, the piston member is located at the rear position for closing the tool clamping chuck. At this time, the piston member is separated from the rear end portion of the operation bar for cleaning. Since the air supply hole is opened in the main shaft housing, the cleaning air supplied to the cleaning air supply hole of the piston member flows into the main shaft housing and is guided to the motor chamber through the air passage. It flows through the room, cools the motor for rotating the main shaft, and flows out of the motor room through the air discharge hole.

The flow rate of the cleaning air flowing into the motor chamber becomes the total amount of the air supply flow rate in the state where the tool mounting taper hole is closed by fitting the taper shank portion of the tool into the tool mounting taper hole. The spindle rotation drive motor is effectively cooled during load operation in which the tool is mounted in the tool mounting taper hole.

In the build-in motor type spindle device according to the second aspect, when the spindle is driven to rotate by the spindle rotation driving motor, the cleaning air supplied to the cleaning air supply hole of the piston member first flows into the rear housing chamber. , Flows into the motor chamber through the air holes of the outer ring holding member, flows axially across the arrangement of the stator and rotor of the spindle rotation drive motor in the motor chamber, cools the stator and rotor by axial flow, It flows out of the motor room through the air exhaust hole.

[0014]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of a build-in motor type spindle device according to the present invention. The build-in motor type spindle device has a spindle housing 1 and a hollow spindle 3 that is rotatably supported by the spindle housing 1.

The main spindle housing 1 includes cylindrical outer main spindle sleeve 5 and inner main spindle sleeve 7 which are fitted and coupled with each other, front end members 9 and 11 attached to the front end of the inner main spindle sleeve 7, and outer main spindle. The rear end member 13 is attached to the rear end of the sleeve 1.

An outer ring holding member 17 of the front bearing member 15 is attached to the inner spindle sleeve 7 near the front end thereof. The rear end portion of the inner main spindle sleeve 7 is the outer main spindle sleeve 5.
The outer ring holding member 21 of the rear bearing member 19 is attached to the rear end of the rear bearing member 19.

The main shaft 3 is rotatably supported by the main shaft housing 1 by a front bearing member 15 and a rear bearing member 19. A tool mounting taper hole 23 for receiving a taper shank portion of the tool is formed at the tip (left end) of the main shaft 13, and a collet chuck member 25 for tool clamping is axially displaced in the inner part of the taper hole 23. It is possible.

An operating shaft 29 of the collet chuck member 25 is arranged in the hollow portion 27 of the main shaft 13 so as to be movable in the axial direction. The operating shaft 29 is connected to the collet chuck member 25 at the front end by a connecting member 31, and is urged rightward in FIG. 1, that is, in the chuck closing direction by a clamp spring 33 made of a disc spring.

The operation shaft 29 and the connecting member 31 penetrate through them in the axial direction, and the tool mounting taper hole 2 is formed at the tip end thereof.
A cleaning air passage hole 35 opening toward 3 is formed therethrough.

A fluid pressure cylinder device 37 for opening and closing the chuck is attached to the rear end member 13. The fluid pressure cylinder device 37 has a cylinder member 39 and an end member 41 fixedly mounted on the rear end member 13, and a piston member 43 fitted to the cylinder member 39 so as to be movable in the axial direction.

The piston member 43 defines a clamp chamber 45 on the left side in the figure and an unclamp chamber 47 on the right side in the figure, and a rear end of the operation shaft 29 is provided by a pad member 49 attached to the tip surface. Facing the department. As shown in FIG. 1, when the piston member 43 is located at the rear position (clamp position), a gap 51 is formed between the pad member 49 and the rear end portion of the operation shaft 29. .

The piston member 43 moves rearward (to the right in FIG. 1) by being supplied with the hydraulic pressure of the clamp chamber 45 through the oil passage 53, and the unclamp chamber 4 through the oil passage 55.
When the hydraulic pressure is supplied to 7, it moves forward (to the left in FIG. 1).

The piston member 43 and the pad member 49 include
A cleaning air supply hole 57 which is aligned with the cleaning air passage hole 35 of the operation shaft 29 is formed.

The outer ring holding member 21 defines a motor chamber 63 having a hermetically sealed structure by the inner main spindle sleeve 7, the outer ring holding member 17, a sealing sleeve 59 attached to the main shaft 3, and a seal ring 61 on the front side, and the rear side. Rear end member 1
3 and the fluid pressure cylinder device 37 define a closed rear housing chamber 65.

Due to this chamber structure, the gap 51 is inside the rear housing chamber 65, and when the piston member 43 is located at the rear position, the cleaning air supply hole 57 is opened to the rear housing chamber 65.

In the motor chamber 63, a stator 67 fixedly mounted on the inner main shaft sleeve 7 and a rotor 71 fixedly mounted on the main shaft 3 by a mount sleeve 69 are arranged, and the stator 67 and the rotor 71 are mounted on the main shaft. The drive motor 73 is configured.

The outer ring holding member 21 includes a rear housing chamber 6
A plurality of ventilation holes 75 for guiding the cleaning air to the motor chamber 63 from 5 are provided. An air discharge hole 77 formed through the outer and inner spindle sleeves 5 and 7 is provided on the opposite side of the outer ring holding member 21 from the stator 67 and the rotor 71, that is, on the front side.

An oil jacket passage 79 is formed in the fitting portion between the outer main spindle sleeve 5 and the inner main spindle sleeve, and oil is supplied from the oil inlet port 81 to the oil jacket passage 79 to open the outlet. Oil is discharged through the port 83.

Next, the operation of the build-in motor type spindle device having the above-mentioned structure will be described.

At the time of tool change, hydraulic pressure is supplied to the unclamp chamber 47 of the fluid pressure cylinder device to move the piston member 43 forward. Due to the forward movement of the piston member 43, the pad member 49 contacts the operation shaft 51, and the operation shaft 51
Is moved forward against the spring force of the clamp spring 33.
As a result, the collet chuck 25 is opened and the tool is exchanged.

At this time, the pad member 49 is moved to the operation shaft 51.
By contacting with the cleaning air supply hole 57, the air gap 51 disappears and the cleaning air supply hole 57 is connected to the cleaning air supply hole 35. Therefore, the cleaning air supplied to the cleaning air supply hole 57 is stored in the operation bar 29. The cleaning air passage hole 35 flows in the axial direction, is jetted from the tip of the cleaning air passage hole 35 to the tool mounting taper hole 23, and the taper surface of the tool mounting taper hole 23 is blown off for cleaning.

When the collet chuck 25 is closed, hydraulic pressure is supplied to the clamp chamber 45 and the piston member 43 is moved backward to the original position shown in FIG. 1, that is, the rear position. As a result, the pad member 49 moves the operation shaft 29.
The gap 51 between the rear end of the operation shaft 29 and the rear end of the operation shaft 29 is reproduced.

At this time, the operating shaft 29 is clamped by the clamp spring 33.
The collet chuck 25 is closed by returning to the original position by the spring force of.

When the main shaft 3 is rotationally driven by the main shaft rotational driving motor 72, the piston member 37 is located at the rear position for closing the collet chuck 25, and at this time, the cleaning air supply hole 57 has a gap 51 and is located in the rear housing chamber. The cleaning air supplied to the cleaning air supply hole 57 first flows into the rear housing chamber 65 because it is opened to the outer air holding member 21.
Of the main shaft rotation driving motor 73 in the motor chamber 63, and particularly the gap between the stator 67 and the rotor 71 in the axial direction. And the stator 67 and the rotor 71 are cooled by an axial flow and flow out of the motor chamber 63 through the air exhaust hole 77 without stagnating in the motor chamber 63.

As a result, the stator 67 and the rotor 71 are effectively air-cooled, and the temperature rise of the motor chamber 63 is suppressed.

As described above, in the state where the piston member 37 is located at the rear position, the flow rate of the cleaning air flowing into the motor chamber 63 depends on the tool mounting taper hole 23.
When the taper shank portion of the tool is fitted to the tool mounting taper hole 23 and the tool mounting taper hole 23 is closed, the total amount of the air supply flow rate becomes, and the spindle rotation during load operation when the tool is mounted in the tool mounting taper hole 23 The drive motor 73 is effectively cooled.

[0038]

The rated output of the spindle drive motor 73 is 1
In the case of 5 kW, the main shaft 3 was rotationally driven at 12000 rpm, and 100 liters of cleaning air of 25 to 26 ° C. was supplied from the cleaning air supply hole 57 having a diameter of 8 mm per minute. The effect of decreasing the temperature by 60 ° C. was obtained.

As described above, the spindle rotation driving motor 73
Since the air cooling is performed by the cleaning air of the tool mounting taper hole 23, it is not necessary to provide a special pipe for air cooling of the spindle rotation driving motor 73. As a result, the number of pipes for air supply and exhaust in one build-in motor type spindle device is reduced, resulting in a simple piping structure, the number of assembly steps for the build-in motor type spindle device is reduced, and the overall size of the build-in motor type spindle device is reduced. The size can be made smaller than in the past, and the maintainability is improved by simplifying the structure.

Further, the cleaning air is effectively used for air-cooling the spindle rotation driving motor 73 when it is not necessary to clean the tool mounting taper hole 23.

In the above, the present invention has been described in detail with respect to a specific embodiment, but the present invention is not limited to this, and various embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art.

[0043]

As can be understood from the above description, in the build-in motor type spindle device according to the first aspect, the air cooling of the built-in spindle drive motor is performed by the cleaning air for the tool mounting taper hole. Therefore, it is not necessary to specially provide a pipe for air-cooling the motor for rotating the main shaft, and the number of pipes for supplying and discharging air in one build-in motor type main shaft device is reduced, resulting in a simple piping structure. As a result, the number of assembly steps for the build-in motor type spindle device can be reduced, the overall size of the build-in motor type spindle device can be made smaller than in the past, and the structure is simplified to improve maintainability. improves. Moreover, the cleaning air is effectively used for air cooling of the spindle rotation drive motor when there is no need to clean the tool mounting taper hole.

The flow rate of the cleaning air flowing into the motor chamber is the total amount of the air supply rate when the taper shank portion of the tool is fitted in the tool mounting taper hole and the tool mounting taper hole is closed. The spindle rotation drive motor is effectively cooled during load operation in which the tool is mounted in the tool mounting taper hole.

In the build-in motor type spindle device according to the second aspect, when the spindle is rotationally driven by the spindle rotational drive motor, the cleaning air supplied to the cleaning air supply hole of the piston member first flows into the rear housing chamber. Then, it flows through the ventilation holes of the outer ring holding member and enters the motor chamber, and flows axially across the portion where the stator and rotor of the spindle rotation drive motor in the motor chamber are arranged, and cools the stator and rotor by axial flow. Since the air flows out of the motor chamber through the air discharge hole, the cleaning air does not stagnant in the motor chamber, and the spindle rotation driving motor is effectively cooled.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a build-in motor type spindle device according to the present invention.

[Explanation of symbols]

 1 main shaft housing 3 main shaft 5 outer main shaft sleeve 7 inner main shaft sleeve 9, 11 front end member 13 rear end member 15 front bearing member 17 outer ring holding member 19 rear bearing member 21 outer ring holding member 23 tool mounting taper hole 25 collet chuck member 27 Hollow part 29 Operation shaft 31 Connecting member 33 Clamp spring 35 Cleaning air passage hole 37 Fluid pressure cylinder device 39 Cylinder member 41 End member 43 Piston member 45 Clamp chamber 47 Unclamp chamber 49 Pad member 51 Void 53 Oil passage 55 Oil passage 57 Cleaning air supply hole 59 Sealing sleeve 61 Seal ring 63 Motor chamber 65 Rear housing chamber 67 Stator 69 Mounting sleeve 71 Rotor 73 Spindle drive motor 75 Vent hole 77 Air discharge hole 79 Oil jacket Passage 81 oil inlet port 83 outlet port

Claims (2)

[Claims] 1. A hollow shaft-shaped main shaft rotatably supported by a main shaft housing, wherein a tip end portion of the main shaft is provided with a tool mounting taper hole for receiving a taper shank portion of the tool, and the main shaft is hollow. A tool clamping chuck and an operation bar for opening and closing the chuck are provided in the portion so as to be movable in the axial direction. A cleaning air passage hole opened toward the tool mounting taper hole penetrates the operation bar in the axial direction. A fluid pressure cylinder device for opening and closing the chuck is incorporated in the rear end of the main shaft housing, and a piston member of the fluid pressure cylinder device faces the rear end of the operation bar, and the piston member has the cleaning air. An air supply hole for cleaning which is aligned with the passage hole is formed,
In a built-in motor type spindle device in which a stator of a spindle driving motor is attached to a motor chamber inside the spindle housing, and a rotor of the spindle driving motor is attached to an outer peripheral portion of the spindle in the motor chamber, the piston member is At the rear position where the chuck for clamping the tool is closed, the cleaning air supply hole is opened in the main shaft housing at a distance from the rear end portion of the operation bar, and the main shaft housing is cleaned from the cleaning air supply hole. A build-in motor type spindle device, characterized in that an air passage for guiding the working air to the motor chamber is defined, and an air discharge hole for discharging cleaning air from the motor chamber is formed in the spindle housing. 2. The motor chamber is separated from the rear end of the main shaft housing by an outer ring holding member of a rear bearing member that supports the rear part of the main shaft, and the cleaning air supply hole is provided in the outer ring holding member and the main shaft housing. A vent hole which is open to a rear housing chamber defined between the rear end portion and the outer ring holding member and which connects the motor chamber and the rear housing chamber to each other. 2. The build-in motor type spindle device according to claim 1, wherein the build-in motor type spindle device is formed on the opposite side of the outer ring holding member with the arrangement portion of the stator and the rotor separated from each other.