KR102374050B1 - Millhead for Composite Machine Tool - Google Patents

Abstract

The present invention relates to a mill head for a composite machine tool and, more specifically, to a mill head for a composite machine tool which reorganizes the structure of a built-in motor, and reorganizes the coupling location of front and rear bearings, to reduce the entire length and prevent the interference with other units, thereby increasing a processed area. To this end, the mill head for a composite machine tool comprises: a housing; a tool clamping unit; a spindle; a built-in motor; front and rear bearings; a cylinder; and a curvic coupling. The housing has a cooling jacket on the inner surface, and a repair cover which can be opened and closed is formed at one side surface for maintenance and repair. The built-in motor comprises a stator which is formed to come in contact with the inner surface of a cooling jacket formed on the inner surface of the housing, and a rotor which is located on the inside of the stator to be rotated, wherein a space is formed between the spindle and the inside of the stator. The front and rear bearings are interposed between the housing and the spindle to support the smooth rotation of the spindle, and have one end portions located at the space formed between the spindle and the inside of the stator of the built-in motor. By the configuration of the built-in motor and the front and rear bearings, the entire length of the mill head can be reduced, thereby preventing the interference with other units. Therefore, durability can be improved.

Description

Millhead for Composite Machine Tool

The present invention relates to a millhead for a multi-purpose machine tool, and in particular, by reconfiguring the structure of the built-in motor and reconfiguring the coupling position of the front and rear bearings, the overall length is reduced to prevent interference with other units to expand the machining area. It relates to a mill head for multi-purpose machine tools.

In general, a machining center is used to perform various operations such as cutting, drilling, hole widening, and grinding by combining a lathe machining operation through a bite and a boring machine, milling machine, and drilling machine into one.

Such a multi-functional machine tool comprises a main spindle unit, a sub spindle unit, a tool rest unit, and a mill head unit.

On the other hand, if the length of the mill head is long, it becomes the main cause of limiting the transfer area for preventing collision during transfer or workpiece processing due to interference with other units located in the vicinity.

Accordingly, there is a demand for a mill head for a multi-purpose machine tool that can minimize interference with other units generated during use of the mill head and reduce material costs, and accordingly, mill heads of various configurations have been proposed.

However, as shown in FIG. 1 , the conventional mill head 100 for a multi-purpose machine tool includes a housing 110 having a cooling jacket 111 on its inner surface, and a tool clamping tool formed in the inner center of the housing 110 . A unit 120, a spindle 130, a built-in motor 140, a front bearing 150 and a rear bearing 160, a cylinder 170, and a curvik coupling 180, The curvik coupling 180 is formed to be located in the front, and since the front bearing 150 and the rear bearing 160 are formed outside of the built-in motor 140, the overall length is inevitably increased, so the combined machine tool (not shown) When the sub spindle moves in the direction of the main spindle, there is a limitation in minimizing the distance due to interference with the mill head, so there is a problem in that the machining area cannot be expanded.

In addition, the conventional mill head for multi-purpose machine tools has a problem in that they collide with each other during operation because they process the workpiece while moving together with many units in a narrow space.

In addition, in the prior art, since only the mill head cannot be disassembled when the mill head is malfunctioning, the B-axis unit and the front and rear bearings formed in the body of the complex machine tool must also be disassembled together, so the operation is cumbersome and takes a long time. .

In addition, in the prior art, since the thrust of the cylinder and the thrust of the curvic coupling operate in the same direction to unclamp the tool, in order to offset the thrust of the cylinder and the curvic coupling from acting on the bearing, As the piston is additionally installed, the length of the mill head becomes longer, which causes interference with other units and increases the cost.

Republic of Korea Patent No. 10-1560014 Republic of Korea Patent Publication 10-2019-0138097

Accordingly, the present invention has been devised to solve the above problems, and an object of the present invention is to reduce the overall length to prevent interference with other units, and at the same time to offset the thrust of the cylinder acting on the bearing, thereby improving durability and processing area It is to provide a mill head for multi-purpose machine tools that expands the

In order to achieve the above object, the present invention provides a millhead for a multi-purpose machine tool comprising a housing, a tool clamping unit, a spindle, a built-in motor, front and rear bearings, a cylinder and a curvik coupling, the The housing has a cooling jacket on its inner surface, and an openable and openable repair cover for maintenance is formed on one side thereof, and the built-in motor includes a stator formed to come into contact with an inner surface of a cooling jacket formed on the inner surface of the housing, and the inside of the stator. It consists of a rotor that is positioned and rotates, a space is formed between the inside of the spindle and the stator, and the front and rear bearings are interposed between the housing and the spindle to support smooth rotation of the spindle, and one end of the spindle It is formed to be located in the space formed between the inner side of the stator and the built-in motor, and by the configuration of the built-in motor and front and rear bearings, the overall length of the mill head is reduced to prevent interference with other units. .

The present invention relates to a millhead for a multi-purpose machine tool, wherein the tool clamping unit, the spindle, the built-in motor, the front and rear bearings and the curvic coupling are formed in the form of an interchangeable cartridge in a housing that can be detached freely. characterized.

In the millhead for a multi-purpose machine tool, the present invention is characterized in that the curvik coupling is composed of a fixed curvik, a rotating curvik, and a piston curvik, and is formed on one side of the rear bearing.

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The present invention is a mill head for a multi-purpose machine tool, wherein the front and rear bearings are formed to be located inside (inside) the space between the stator and the spindle of the built-in motor.

The present invention is characterized in that, in the millhead for a multi-purpose machine tool, the curvik coupling and the cylinder always operate oppositely at the same time so that the thrusts may conflict with each other.

In addition, the present invention can further provide a complex machine tool having the mill head.

As described above, the present invention minimizes the length of the mill head to prevent interference with other units even in a narrow space, thereby expanding the processing area.

In addition, in the present invention, since only the mill head can be disassembled when the mill head fails, maintenance work is easy and the work time can be shortened.

In addition, the present invention has the effect of preventing damage or durability deterioration caused by unnecessary force acting on the bearing by making the thrust of the curvic coupling conflict with the direction of the thrust of the cylinder.

In addition, by forming the tool clamping unit, spindle, built-in motor, front and rear bearings, and the curvic coupling in the form of an interchangeable cartridge in the housing, the angle of the curvik coupling and the spindle can be adjusted. It has the effect of improving workability by making it simple and easy to adjust the origin of

1 is a view schematically showing a cross section of a main part of a mill head for a conventional multi-task machine tool.
2 is a view schematically showing the external appearance of a mill head for a multi-purpose machine tool according to a preferred embodiment of the present invention.
3 is a front view of FIG. 2 ;
4 is a sectional view taken along line AA of FIG. 3 .
5 is a view schematically showing a state in which the mill head according to the present invention is installed in a multi-function machine tool.
6 is a cross-sectional view schematically showing a state in which the mill head for a multi-purpose machine tool clamps the tool according to a preferred embodiment of the present invention.
7 is a cross-sectional view schematically illustrating a state in which the mill head for a multi-purpose machine tool according to a preferred embodiment of the present invention unclamps the tool.
8 is a view schematically showing a state of aligning the tool origin of the mill head according to the present invention.

Hereinafter, a preferred embodiment according to the present invention will be described in more detail based on the accompanying drawings.

Here, in all the drawings below, components having the same function are omitted by using the same reference numerals, and repeated descriptions are omitted, and the terms to be described below are defined in consideration of the functions in the present invention, which have their own and commonly used meanings. should be interpreted as

2 to 5, the millhead 200 for a machine tool according to the present invention includes a housing 210, a tool clamping unit 220, a spindle 230, front and rear bearings 240, ( 250 , a built-in motor 260 , a cylinder 270 , and a curvik coupling 280 .

The housing 210 has a maintenance cover 211 for maintenance on the outside, and a cooling jacket 212 , a tool clamping unit 220 , a spindle 230 , and front and rear sides inside. It is a cylindrical case for accommodating (embracing) parts or mechanisms such as bearings 240 , 250 , a built-in motor 260 , a curvic coupling 270 , and a cylinder 280 .

The repair cover 211 is formed to be openable and openable by a fastener 211a such as a hexagonal bolt.

Accordingly, wires and pipes connected from the body can be easily installed or separated without disassembling the B-axis unit 340 that forms the body of the machine tool 300 through the maintenance cover 211, and the When the head 200 fails, it can be repaired by checking whether there is an abnormality in the rear part.

In the cooling jacket 212 , cooling oil can flow in order to reduce heat generated when the spindle 230 rotates.

In addition, a key 213 for aligning the origin of a tool (not shown) is formed in the central portion of the front surface of the housing 210 , and fasteners 214 for coupling and separation are formed on both sides of the front surface.

The tool clamping unit 220 includes a holder 221 capable of clamping or unclamping a tool such as a drill or an end mill, and a collet located at one side of the holder 221 and detachably coupled to the holder 221 ( collet) (222).

Here, the holder 221 has a rear end detachably coupled to the collet 222 and a front end for clamping or unclamping the tool.

The collet 222 may be movably disposed in the shaft hole of the spindle 230 . The collet 222 may be movably coupled to the inner circumferential surface of the spindle 230 in the axial direction of the spindle 230 .

And, in the present embodiment, the collet 222 may be coupled to the inner peripheral surface of the spindle 230 in the form of splines.

Accordingly, the collet 222 may be rotationally moved along the inner circumferential surface of the spindle 230 .

In addition, a disc spring 223 is provided in the middle of the collet 222 to form an elastic force and an elastic restoring force so that the tool can be clamped or unclamped through the holder 221 .

Here, it is preferable to increase the spring constant or elastic modulus and decrease the quantity of the leaf spring 223 so that the length of the tool clamping unit 220 can be reduced.

That is, by increasing the spring constant or elastic modulus of the leaf spring 223 and reducing the quantity, the length of the tool clamping unit 220 can be reduced, and the clamp (clamp) to prevent the tool from being separated from the holder 221 during workpiece processing ) power can be provided.

Therefore, the present invention secures the thickness of the spindle 230 by increasing the size of the rear bearing 260, which will be described later, in order to make a compact millhead 200, and the spring constant of the leaf spring 223 or By increasing the elastic modulus and reducing the quantity, the length of the tool clamping unit 220 can be reduced.

The spindle 230 is rotatably coupled to the inner center of the housing 210 to transmit power to the tool to rotate a tool such as a drill or an end mill for processing a material, and the shaft end is A rotating shaft used for mounting a workpiece or cutting tool.

The built-in motor 240 includes a stator 241 that is formed to come into contact with the inner surface of the cooling jacket 212 coupled to the inner surface of the housing 210, and is positioned inside the stator 241 to rotate. Consists of a rotor 242, the stator 241 has a larger diameter and shorter length than the inner diameter of a conventional built-in motor stator.

That is, in the built-in motor 240, one end of the front and rear bearings 250 and 260 is inserted into the inside (inside) of the stator 241 by forming the inner diameter of the stator 241 larger than that of the prior art. Since the length can be shortened, the total length of the mill head 200 can be reduced by reducing the length of the tool clamping unit 220 or the spindle 230 .

The front and rear bearings 250 and 260 are interposed between the housing 210 and the spindle 230 to support the smooth rotation of the spindle 230, and one end portion of the stator of the built-in motor 240 ( 241) is formed to be located inside.

The front bearing 250 and the rear bearing 260 have an outer ring (not shown) supported by a front bearing housing 251 and a rear bearing housing 261, and an inner ring (not shown) with a spindle 230 ) is supported on the outer surface of

Here, the front and rear bearings 250 and 260 are preferably formed to be located inside (inside) the space between the stator 241 and the spindle 230 of the built-in motor 240 .

That is, one end of the front bearing housing 251 and the rear bearing housing 261 constituting the front bearing 250 and the rear bearing 260 is disposed between the spindle 230 and the stator 241 of the built-in motor 240 . It is formed to be inserted into the space.

In this way, the front bearing 250 and the rear bearing 260 are coupled and formed inward (inside) as much as possible using the space formed between the stator 241 and the spindle 230 of the built-in motor 240 . The overall length of the mill head 200 may be reduced by reducing the length of the tool clamping unit 220 or the spindle 230 .

The cylinder 270 is coupled to the rear of the tool clamping unit 220 to move the tool clamping unit 220 in the axial direction with forward and backward motions of the piston 271 so that the holder 221 clamps or unclamps the tool. to do it

The curve coupling 280 is composed of a fixed curve 281, a rotary curve 282, and a piston curve 283, so that the tool clamping unit 220 clamps or unclamps the tool. It is formed on one side of the rear bearing 260 to form a conflicting thrust.

The fixed curve 281 is fixed by a fastener such as a bolt, and the rotary curve 282 is fixed when the piston curve 283 and the gear mesh with each other and rotates when separated.

In addition, the piston curve 283 reciprocates forward and backward by hydraulic force.

The curvik coupling 280 of this configuration fixes the spindle 230 when the piston curvik 283 and the rotary curvik 282, which linearly reciprocate by hydraulic force, are toothed, and when separated, the spindle ( 230) is a device to release the fixation.

Therefore, during turning, the rotation curve 282 and the piston curve 283 are teeth-coupled so that the spindle 230 and the tool are fixed without rotation.

In addition, the curvic coupling 280 is located on the opposite side of the front side bearing 250 , which is the original position, so as to form a thrust that conflicts with the thrust generated during the forward and backward operations of the piston 271 of the cylinder 270 , rather than the rear side. It is formed on one side of the bearing 260 .

And, in the present invention, the curvilinear coupling 280 and the cylinder 270 are configured to always operate in opposite directions at the same time so that the thrusts may conflict with each other.

For example, when the cylinder 270 is operated so that the holder 221 of the tool clamping unit 220 unclamps the tool, the piston curb 283 constituting the curvik coupling 280 moves to move the rotating curvik 282 . ) and the clamping action to fix the spindle 230.

Conversely, when the cylinder 270 is operated such that the holder 221 of the tool clamping unit 220 clamps the tool, the piston curbik 283 constituting the curvik coupling 280 is separated from the rotating curbik 282 . The unclamp operation is performed to release the fixing of the spindle 230 .

Accordingly, since the curvic coupling 280 and the cylinder 270 always simultaneously and oppositely operate so that the thrust may conflict with each other, excessive thrust is not transmitted to the front and rear bearings 250 and 260 .

In addition, in the present invention, the cooling jacket 212, the tool clamping unit 220, the spindle 230, the built-in motor 240, the front and rear bearings 250, 260, and the curvik coupling 280 are , it is preferable to be formed in the form of an interchangeable cartridge freely detachable within the housing 210 .

That is, it is formed in the form of a cartridge that is detachably detachable in the housing 210 based on the cooling jacket 212 .

Accordingly, the entire cartridge can be disassembled without disassembling the rear bearing 260, and the housing 210 and the cooling jacket 212 are assembled to adjust the origin of the tool when the mill head 200 is assembled. 214), it is possible to fine-tune the fixed side of the curvic coupling 280 at the rear side by rotating the entire cartridge, so that the origin of the tool can be adjusted.

In addition, unlike the prior art, through this, the curvic coupling 280 is formed to the rear and the operating direction of the curvic coupling 280 is opposite to that of the prior art.

On the other hand, the combined machine tool 300 according to the present invention is equipped with a main spindle unit 310, a tool rest unit 320 and a sub spindle unit 330, and a mill head 200, as shown in FIG. It is largely divided into the B-axis unit 340 that is made.

In addition, the present invention may further provide a complex machine tool 300 having the mill head 200 .

The operating state of the present invention configured as described above will be described with reference to FIGS. 6 and 7 as follows.

First, in the case of milling a workpiece using the combined machine tool 300 provided with the mill head 200 according to the present invention, the cylinder 270 through the hydraulic pressure flowing through the flow path (not shown) formed on one side of the cylinder 270 . A piston (Piston) 271 of the 270 is moved backward.

At the same time, as the plate spring 223 of the tool clamping unit 220 is restored by the elastic restoring force, the holder 221 is closed to clamp the tool.

Next, a rotor 242 and a spindle 230 are rotated with a power source generated from the built-in motor 240 to mill the workpiece.

At this time, the piston curvik 283 constituting the curvic coupling 280 releases the fixation of the spindle 230 by an unclamping operation that is separated from the rotating curbik 282 .

Conversely, after the tool is replaced or the milling operation of the workpiece is completed, the piston 271 of the cylinder 270 is advanced through the hydraulic pressure flowing through the flow path (not shown).

At the same time, as the plate spring 223 of the tool clamping unit 220 is compressed, the holder 221 is unfolded to unclamp the tool.

At this time, the piston curvik 283 constituting the curvic coupling 280 moves and teeth-engages with the rotating curbik 282 to fix the spindle 230 by a clamping operation.

As described above, in the present invention, when the piston 271 of the cylinder 270 moves forward or backward, the curvik coupling 280 is clamped or Since a force for unclamping is generated, the force of the cylinder 270 applied to the front and rear bearings 250 and 260 is canceled by this reaction force, so that the Damage may be prevented, and durability may be improved to increase lifespan.

Accordingly, there is no need to additionally install a front piston to offset the thrust between the cylinder 270 and the curvilinear coupling 280 acting on the front and rear bearings 250 and 260 .

On the other hand, when the workpiece is converted to turning using the main spindle unit 310 or the sub spindle unit 330 of the complex machine tool 300, the piston curvic constituting the curvic coupling 280 is After moving the 283 toward the rotation curve 282 to fix the spindle 230 so that it does not rotate by tooth engagement, that is, a clamp operation, the main spindle of the main spindle unit 310 or the sub spindle unit 330 is rotated to do the turning operation.

At this time, the mill head 200 advances the piston 271 of the cylinder 270 through hydraulic pressure flowing through a flow path (not shown) formed on one side of the cylinder 270 .

Accordingly, as the plate spring 223 of the tool clamping unit 220 is compressed, the holder 221 is unfolded to unclamp the tool (not shown).

At the same time, the piston curve 283 constituting the curve coupling 280 moves toward the rotation curve 282 to fix the spindle 230 by tooth engagement, that is, a clamping operation.

In this way, during the turning operation, the spindle 230 of the mill head 200 is fixed without rotating, and the main spindle or sub-spindle of the complex machine tool 300 rotates at high speed to turn the workpiece.

In addition, according to the present invention, as shown in FIG. 8, the tool clamping unit 220, spindle 230, built-in motor 240, and electric , After slightly loosening the fasteners 214 on the front that fix the rear bearings 250, 260, and the curvic coupling 280, push it to one side so that the cartridge can rotate finely, and then adjust the cooling jacket ( Cooling Jacket) 212 and the curvik coupling 280 located on the rear side is also rotated finely.

At this time, the origin of the tool is aligned with the origin of the key 213 that holds the rotation of the tool formed on the front surface of the mill head 200 .

That is, the origin of the rotation curve 282 is adjusted according to the position of the fixed curve 281 of the curve coupling 280, and this can adjust the angle of the spindle 230. A key that holds the rotation of the tool. After inserting a separate key holder (not shown) at 213, the origin of the tool is adjusted by rotating it.

The present invention described above is not limited by the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes to other equivalent embodiments are possible without departing from the technical spirit of the present invention. It will be apparent to those of ordinary skill in the art to which the present invention pertains.

200: mill head 210: housing (housing)
211: repair cover 211a: fastener
212: cooling jacket 213: key (Key)
214: fastener 220: tool clamping unit
221: holder 222: collet (collet)
223: Disc spring 230: Spindle
240: built-in motor 241: stator
242: Rotor 250: Front bearing
260: rear bearing 270: cylinder
271: piston 280: curvik coupling
281: fixed curve 282: rotating curve
283: piston curve 300: multi-purpose machine tool
310: main spindle unit 320: tool rest unit
330: sub spindle unit 340: B-axis unit

Claims (7)

In the millhead for a multi-purpose machine tool comprising a housing, a tool clamping unit, a spindle, a built-in motor, front and rear bearings, a cylinder and a curvik coupling,
The housing has a cooling jacket on its inner surface, and an openable and openable maintenance cover for maintenance is formed on one side thereof,
The built-in motor consists of a stator formed to be in contact with the inner surface of the cooling jacket formed on the inner surface of the housing and a rotor positioned inside the stator to rotate, and a space is formed between the spindle and the inner side of the stator,
The front and rear bearings are interposed between the housing and the spindle to support the smooth rotation of the spindle.
A mill head for a multi-purpose machine tool, characterized in that it prevents interference with other units by reducing the overall length of the mill head by the configuration of the built-in motor and front and rear bearings. The method of claim 1,
The tool clamping unit, the spindle, the built-in motor, the front and rear bearings and the curvic coupling are formed in the form of an interchangeable cartridge in a housing that can be detached freely. The method of claim 1,
wherein the curvik coupling is composed of a fixed curvik, a rotating curvik, and a piston curvik, and is formed on one side of the rear bearing. delete The method of claim 1,
The front and rear bearings are a mill head for a combined machine tool, characterized in that it is formed to be located inside (inside) the space between the stator and the spindle of the built-in motor. The method of claim 1,
The millhead for a multi-purpose machine tool, characterized in that the curvik coupling and the cylinder always operate in opposite directions at the same time so that the thrusts may conflict with each other. A combined machine tool comprising the mill head according to any one of claims 1 to 3, 5 and 6.

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