KR20210129478A - Spindle clamping apparatus of machine tool - Google Patents

Abstract

The present invention relates to a spindle clamping device for a machine tool. According to the present invention, the spindle clamping device for a machine tool comprises: a spindle for rotating a material; a support part installed adjacent to the spindle; and a clamping unit installed on the support part. The clamping unit is capable of clamping the spindle to prevent rotation of the spindle by coupling the spindle and the support part by electromagnetic force generated by the supplied power.

Description

Spindle clamping apparatus of machine tool

The present invention relates to a spindle clamping device for a machine tool, and more particularly, clamping or unclamping the spindle for C-axis machining by electromagnetic force supplied to the clamping unit and elastic restoring force of the return part to achieve miniaturization according to structure simplification. The present invention relates to a spindle clamping device for a machine tool capable of improving machining precision by adjusting the clamping force of the spindle according to machining conditions.

In general, a machine tool refers to a machine used for the purpose of processing a metal/non-metal workpiece into a desired shape and size using an appropriate tool by various cutting or non-cutting methods.

Various types of machine tools, including turning centers, vertical/horizontal machining centers, door machining centers, Swiss turns, electric discharge machines, horizontal NC boring machines, CNC lathes, multi-tasking machines, etc. is being used

Among machine tools, multi-tasking machine means a turning center equipped with a multi-function automatic tool changer (ATC) and tool magazine that performs various machining types such as turning, drilling, tapping, and milling. In the multi-tasking machine, the operator loads the tool required for machining or manually loads the tool into the tool magazine when exchanging it.

In general, various types of machine tools currently used have an operation panel to which numerical control (NC) or computerized numerical control (CNC) technology is applied. Such an operation panel is provided with various function switches or buttons and a monitor.

In addition, the machine tool includes a table on which a workpiece material is seated and transferred for processing the workpiece, a pallet for preparing the workpiece before processing, a spindle that rotates when a tool or workpiece is combined, a tailstock for supporting the workpiece, etc. during processing, a vibration isolator etc. are provided.

In general, in a machine tool, a table, a tool rest, a main shaft, a tailstock, a vibration isolator, etc. are provided with a conveying unit which conveys along a conveying axis in order to perform various processing.

In addition, in general, a machine tool uses a plurality of tools for various processing, and a tool magazine or a turret is used as a tool storage place for storing and storing a plurality of tools.

Such a machine tool uses a plurality of tools for various processing, and a tool magazine is used in the form of a tool storage place storing a plurality of tools.

In addition, in general, a machine tool is provided with an automatic tool changer (ATC, Automatic Tool Changer) for withdrawing a specific tool from the tool magazine or receiving it again according to the command of the numerical control unit in order to improve the productivity of the machine tool.

In addition, in general, a machine tool is provided with an automatic pallet changer (APC, Automatic Palette Changer) in order to minimize the non-working time. The automatic pallet changer (APC) automatically exchanges pallets between the workpiece machining area and the workpiece installation area. Pallets may be loaded with workpieces.

In addition, in general, machine tools are largely classified into turning centers and machining centers according to processing methods. In general, the turning center rotates the workpiece, and the machining center performs the machining of the workpiece while the tool rotates.

In general, a machine tool that can implement various machining processes such as turning, milling, drilling, tapping, and boring in one machine tool step is called a multi-task center or integrated mill turn center. By using such a multi-tasking machine, it is possible to reduce lead time, number of parts, work load, work space, etc., as well as improve productivity and precision.

In general, turning centers including multi-tasking machines control the exact position of the main axis (C-axis machining function) for turning machining, which is performed by controlling only the rotation speed of the main axis, and for milling, drilling, tapping, and contour machining using a tool rest. can be done

A turning center, also called a double lathe, is a device that processes the workpiece by approaching the tool while rapidly rotating the workpiece mounted on the spindle.

In particular, the 3-axis turning center capable of milling among machine tools requires a strong fixation of the spindle so that the material does not rotate when drilling using a 3-axis tool. The spindle must be fixed. As such, a device for clamping or unclamping a spindle to perform a C-axis machining function is a spindle clamping device of a machine tool.

As shown in FIG. 1, in the spindle clamping device of the conventional machine tool, the support 7 is mounted on one side of the spindle 2, the chuck 4 and the jaw 5 are installed on the other side of the spindle, and the workpiece 6 is chucked as a support.

In addition, when performing the C-axis machining function, the clamping unit 3 driven by hydraulic pressure installed adjacent to the spindle 2 operates to clamp the spindle 2 .

As such, as the spindle clamping device of the conventional machine tool operates by hydraulic pressure, various pipes or connecting devices and hydraulic supply devices for supplying or recovering hydraulic pressure must be separately installed, so the structure is complicated, and a lot of cost is consumed in manufacturing, There was a problem in that the maintenance time and cost were also increased.

In addition, the spindle clamping device of the conventional machine tool has a complicated structure as the clamping unit is installed between the support and the spindle or separately from them, and it is impossible to achieve compactness, so the overall size of the machine tool increases, and the space utilization decreases. , there was a problem that the effective operation of the equipment could not be implemented due to interference.

Moreover, the spindle clamping device of the conventional machine tool clamps or unclamps the spindle through hydraulic pressure, so that the fine clamping power cannot be adjusted according to the processing conditions, thereby reducing the machining precision and lowering the stability and reliability of the machine tool. There was a problem being

In addition, as the spindle clamping device of a conventional machine tool operates in a hydraulic manner, the viscosity of the hydraulic pressure is changed by the temperature change of the hydraulic pressure. Accordingly, there was a problem in that the machining defect rate increased, causing environmental problems by causing material waste, and the productivity of the machine tool decreased as the non-machining time increased.

Korean Patent Publication No. 10-2007-0070364 Korean Patent Publication No. 10-2009-0029170 Korean Patent Publication No. 10-2014-0083097 Korean Patent Publication No. 10-2016-0068176

The present invention is to solve the above problems, and an object of the present invention is to prevent the rotation of the spindle for C-axis machining. Since clamping is performed and the clamping unit is integrally installed on the support, the structure of the spindle clamping device is simplified to reduce the size and weight of the spindle clamping device. to improve the safety and reliability of the machine tool by effectively controlling the It is to provide a spindle clamping device for a machine tool that can reduce maintenance costs by preventing equipment damage or breakage in advance.

In order to achieve the object of the present invention, there is provided a spindle clamping device for a machine tool according to the present invention, comprising: a spindle for rotating a material; a support installed adjacent to the spindle; and a clamping unit installed on the support part, wherein the clamping unit may clamp the spindle to prevent rotation of the spindle by coupling the spindle and the support part by electromagnetic force generated by the supplied power.

In addition, in a preferred embodiment of the spindle clamping device of the machine tool according to the present invention, the spindle of the spindle clamping device of the machine tool is rotated in conjunction with the spindle, one side of which is coupled to the spindle; The support part may include a housing part disposed on the other side of the rotating part.

In addition, in a preferred embodiment of the spindle clamping device of the machine tool according to the present invention, the clamping unit of the spindle clamping device of the machine tool is coupled to the housing part so as to move forward and backward in the horizontal direction to the housing part. being a slide unit; a support part coupled to the housing part so as to move vertically in the vertical direction according to the forward/backward movement of the slide part; and a clamping part formed under the support part so as to contact or separate from the rotation part according to the vertical elevation movement of the support part.

In addition, in a preferred embodiment of the spindle clamping device for a machine tool according to the present invention, at least one part of the housing part of the spindle clamping device of the machine tool is formed of an electromagnet, and the clamping unit is drilling or contouring the material. When the slide part is moved forward in a horizontal direction so that the slide part comes into contact with or close to the housing part by electromagnetic force by the power supplied to the housing part, the support part moves vertically according to the horizontal forward movement of the slide part. As it descends, the clamping part may come into contact with the rotating part to prevent rotation of the spindle.

In addition, in a preferred embodiment of the spindle clamping device of the machine tool according to the present invention, the clamping unit of the spindle clamping device of the machine tool is installed in a part of the housing part and the slide part by the electromagnetic force by the supplied power to the housing It may further include; an electromagnet unit for pulling in contact with or close to the unit.

In addition, in a preferred embodiment of the spindle clamping device of the machine tool according to the present invention, the clamping unit of the spindle clamping device of the machine tool is configured to return the support part when the power supplied to the housing part or the electromagnet part is cut off. It may further include; a return portion installed between a portion of the housing portion and the support portion to elastically press the support portion to move upwardly in the vertical direction.

In addition, in a preferred embodiment of the spindle clamping device of the machine tool according to the present invention, the clamping unit of the spindle clamping device of the machine tool is provided in a part of the housing part to measure the strength of the magnetic field of the electromagnet part and the electromagnet part and It may further include a sensing unit that is installed adjacently.

In addition, in a preferred embodiment of the spindle clamping device of the machine tool according to the present invention, the housing portion of the spindle clamping device of the machine tool is a through-groove formed through a part of the housing portion; a flange portion formed inside one side of the housing portion; and a step portion formed to be stepped inside the other side of the housing portion.

In addition, in a preferred embodiment of the spindle clamping device of the machine tool according to the present invention, the slide portion of the spindle clamping device of the machine tool is inserted into and coupled to the through-groove portion in a horizontal direction so as to move forward and backward; a bent portion bent at the front end of the body portion to extend in a vertical direction; and an inclined surface formed to be inclined at a predetermined angle at the tip of the bent part.

Further, in a preferred embodiment of the spindle clamping device of the machine tool according to the present invention, the support portion of the spindle clamping device of the machine tool is a base portion; a receiving part which is recessed in a part of the base part to seat the bent part; a tapered surface inclined at an angle corresponding to the inclined surface at the front end of the receiving part to engage the inclined surface; and a coupling part extending to protrude from one side of the base part and inserted and coupled to the housing part.

In addition, in a preferred embodiment of the spindle clamping device for a machine tool according to the present invention, the body part of the spindle clamping device of the machine tool is formed of a magnetic material, and when power is supplied to the electromagnet part, the body of the slide part by electromagnetic force The part moves forward in the horizontal direction so as to be in contact with or close to the electromagnet part, and as the support part moves downward in the vertical direction by the engagement of the inclined surface and the tapered surface in conjunction with the forward movement of the main body part, the clamping part and the rotating part contact to prevent rotation of the spindle.

In addition, in a preferred embodiment of the spindle clamping device for a machine tool according to the present invention, when the power to the electromagnet part of the spindle clamping device of the machine tool is cut off, the electromagnetic force of the electromagnet part is released, and the return part elastically presses the support part. The support part moves upward in the vertical direction, and in conjunction with the upward movement of the support part, the body part of the slide part moves backward in the horizontal direction so that the body part of the slide part is separated from the electromagnet part by the engagement of the tapered surface and the inclined surface, and the support part is vertical According to the upward movement in the direction, the contact between the clamping part and the rotating part is released to allow rotation of the spindle.

In addition, in a preferred embodiment of the spindle clamping device of the machine tool according to the present invention, the clamping unit of the spindle clamping device of the machine tool may further include an auxiliary power supply unit for supplying power to the electromagnet unit in an emergency. have.

The spindle clamping device of the machine tool according to the present invention is the rotating part of the support part by the electromagnetic force supplied to the electromagnet part of the clamping unit or the housing part of the support part and the engaging structure of the inclined surface and the tapered surface in order to prevent the rotation of the spindle for C-axis machining. By blocking the rotation of the spindle to clamp the spindle, and release the rotation of the rotating part by the elastic restoring force of the return part and the engaging structure of the inclined and tapered surfaces to perform unclamping of the spindle, unnecessary equipment and configurations such as hydraulic lines are excluded. And since the clamping unit is installed in the support part, the structure is simplified, thereby reducing the size and weight of the spindle clamping device, reducing manufacturing cost, and maximizing space utilization.

In addition, the spindle clamping device of the machine tool according to the present invention controls the power of the power supplied to the electromagnet unit or the housing unit to effectively control the clamping force of the spindle required for C-axis machining, so that the spindle can be in an optimal state according to the machining conditions. By setting the clamping force and keeping the set clamping force constant, the safety and reliability of the machine tool can be improved, and the machining precision can be maximized.

Furthermore, in the spindle clamping device of a machine tool according to the present invention, the sensing unit measures the strength of the electromagnetic force, and through this, the wear state of the clamping unit is checked, and the replacement time is notified to the operator in advance through an alarm, etc., thereby promoting the convenience of the operator and , it has the effect of improving processing precision, preventing damage or breakage of equipment in advance, and preventing safety accidents.

In addition, the spindle clamping device of the machine tool according to the present invention performs clamping of the spindle by electromagnetic force supplied to the electromagnet part of the clamping unit or the electromagnet part of the housing part of the support to prevent rotation of the spindle for C-axis machining. By maintaining a constant clamping force under the same processing conditions, it reduces the maintenance time and cost by automatically guiding the problem of not supplying a constant clamping force due to the temperature change of the conventional hydraulic pressure and the resulting change in viscosity. It has the effect of maximizing the productivity of the machine tool by minimizing the non-working time due to maintenance, maintenance, etc.

1 shows a cross-sectional view of a spindle clamping device of a conventional machine tool.
Figure 2 shows a cross-sectional view of the spindle clamping device of the machine tool according to the present invention.
3 is a perspective view showing a state in which the clamping unit is coupled to the support part of the spindle clamping device of the machine tool according to the present invention.
Figure 4 shows a perspective view of the slide portion of the clamping unit of the spindle clamping device of the machine tool according to the present invention.
Figure 5 shows a perspective view of the support portion of the clamping unit of the spindle clamping device of the machine tool according to the present invention.
6 is a cross-sectional view taken along line AA of FIG. 3 in an unclamped state of the spindle clamping device of the machine tool according to the present invention.
7 is a cross-sectional view taken along line AA of FIG. 3 in a state in which the spindle clamping device of the machine tool according to the present invention is clamped.
8 is a cross-sectional view taken along line BB of FIG. 3 in an unclamped state of the spindle clamping device of the machine tool according to the present invention.
9 is a cross-sectional view taken along line BB of FIG. 3 in a state in which the spindle clamping device of the machine tool according to the present invention is clamped.

Hereinafter, with reference to the drawings of the spindle clamping device of the machine tool according to an embodiment of the present invention will be described in detail. The embodiments introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. And, in the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numbers refer to like elements throughout.

Advantages and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of description.

The terminology used herein is for the purpose of describing the embodiments, and thus is not intended to limit the present invention. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprise” and/or “comprising” refers to the presence of one or more other components, steps, operations and/or elements mentioned. or addition is not excluded.

Figure 2 shows a cross-sectional view of the spindle clamping device of the machine tool according to the present invention, Figure 3 shows a perspective view of a state in which the clamping unit is coupled to the support portion of the spindle clamping device of the machine tool according to the present invention. Figure 4 shows a perspective view of the slide part of the clamping unit of the spindle clamping device of the machine tool according to the present invention, Figure 5 shows a perspective view of the support part of the clamping unit of the spindle clamping device of the machine tool according to the present invention. 6 is a cross-sectional view taken along line AA of FIG. 3 in an unclamped state of the spindle clamping device of a machine tool according to the present invention, and FIG. 7 is a state in which the spindle clamping device of the machine tool according to the present invention is clamped FIG. 3 is a cross-sectional view taken along line AA of 8 is a cross-sectional view taken along line BB of FIG. 3 in an unclamped state of the spindle clamping device of a machine tool according to the present invention, and FIG. 9 is a state in which the spindle clamping device of the machine tool according to the present invention is clamped FIG. 3 is a cross-sectional view taken along the BB line.

Definitions of terms used below are as follows. "Horizontal direction" means the horizontal direction in the same member, that is, the X-axis direction in Figs. 2, 3 and 6 to 9 refer to the Y-axis direction, and "width direction" refers to the vertical direction in the same member while being perpendicular to the horizontal and vertical directions. In addition, "upper (upper)" means an upward direction in "vertical direction", that is, a direction facing upward of the Y-axis in FIGS. 2, 3, and 6 to 9, and "downward (lower)" means "vertical " in the downward direction, that is, in FIGS. 2, 3, and 6 to 9 , it means a direction toward the downward direction of the Y-axis. In addition, the inner side means a side relatively close to the center, that is, the inside of the same member, and the outer side means a side relatively far from the center, that is, the outside, in the same member.

A spindle clamping device 1 of a machine tool according to the present invention will be described with reference to FIGS. 2 to 9 . 2 to 9 , the spindle clamping device 1 of a machine tool according to the present invention includes a spindle 100 , a support 200 , and a clamping unit 300 .

The spindle 100 rotates the chuck 4 and the workpiece 6 chucked by the jaw 5 . Although not shown in the drawings, the spindle 100 is rotated by a built-in servomotor or a belt or chain driving type servomotor.

A chuck 4 and a jaw 5 are disposed on one side of the spindle. Specifically, as shown in FIG. 2, the chuck is coupled to the right outer peripheral surface of the spindle and rotates in conjunction with the spindle. Jaw 5 is coupled to chuck 4 . The jaw is chucked by the draw tube (not shown in the figure) as the jaw is closed in the center direction of the spindle. That is, the material is chucked through the chuck and jaw inside the spindle.

Although not shown in the drawings, the draw tube is horizontally movable in a hollow part formed along the axial direction of the spindle, and one side is connected to the rotating part of the support part and the other side is installed to be connected to the chuck.

The support 200 is installed adjacent to the spindle 100 . 2 to 9 , the support 200 is illustrated to be installed adjacent to the left side of the spindle 100, but the support may be installed to the right side of the spindle, in which case the chuck and jaw are disposed on the left side of the spindle. That is, the support part is installed adjacent to one side of the spindle, and the chuck and jaw are installed on the other side of the spindle so as to face the support part and the spindle in a horizontal direction. In addition, when the support part is installed adjacent to the spindle and power is supplied to a clamping unit to be described later, the clamping unit combines the spindle and the support part by electromagnetic force to clamp the spindle to block rotation of the spindle. When the power supply is cut off, the clamping unit releases the coupling between the spindle and the support to unclamp the spindle, allowing the spindle to rotate.

The clamping unit 300 is installed on the support 200 . Specifically, the clamping unit 300 is integrally installed in a detachable state on the support unit 200 to promote miniaturization and maximize space utilization. Although not shown in the drawing, the clamping unit 300 clamps the spindle by electromagnetic force by the power supplied from the power supply unit, and when the power supply is cut off, it is unclamped by the elastic restoring force of the return unit to be described later.

2 to 3 and 6 to 9, the spindle 100 of the spindle device 1 of the machine tool according to the present invention further includes a rotating part, and the supporting part 200 is a housing part 210. further includes

The rotating part 110 is installed with one side coupled to the spindle so as to rotate in conjunction with the spindle 100 . In addition, the other side of the rotating part is rotatably inserted into the hollow part inside the housing part 210 to rotate in conjunction with the spindle and support the housing part at the same time.

The housing part 210 is disposed on the other side of the rotating part 110 . Specifically, one side of the rotating unit 110 is coupled to the spindle to rotate in association with the spindle, and the other side of the rotating unit is rotatably inserted into the hollow part of the housing to support the housing. The housing part 210 forms the overall outer shape of the support part 200 .

In addition, the clamping unit to be described later does not include an electromagnet part installed on a separate flange part, and at least one part of the housing part may be formed of an electromagnet. That is, at least a part of the housing part, preferably a flange part, which will be described later, has a predetermined rigidity and is formed of a magnetic material, so that when power is supplied to the housing part, the slide part of the clamping unit contacts or adjacent to the housing part by electromagnetic force. can attract As such, since a separate electromagnet part is not installed in the flange part and the flange part or a part of the housing part of the housing part is formed of a magnetic material, it is possible to simplify the structure and reduce the manufacturing cost.

2 and 4 to 9, the clamping unit 300 of the spindle device 1 of the machine tool according to the present invention includes an electromagnet part 310, a slide part 320, a support part 330, It includes a clamping part 340 and a return part 350 .

In addition, "forward" means a direction moving in the left direction in the "horizontal direction", that is, in the left direction of the X-axis in FIGS. , that is, in FIGS. 2, 3, and 6 to 9 , it means a direction moving in the right direction of the X-axis. In addition, "rise" means a direction moving upward in the vertical direction, that is, in the upward direction of the Y-axis in FIGS. That is, in FIGS. 2, 3, and 6 to 9 , it means a direction of movement in the downward direction of the Y-axis.

As described above, at least one part of the housing part is formed of an electromagnet, and the clamping unit is configured to contact or close the slide part with the housing part by the electromagnetic force from the power supplied to the housing part during drilling or contour processing of the material. Move forward in the horizontal direction (moved to the left in the X-axis direction in FIGS. 6 to 9), and the support part moves downward in the vertical direction according to the horizontal forward movement of the slide part (downward in the Y-axis direction in FIGS. 6 to 9) movement), the clamping part comes into contact with the rotating part to prevent rotation of the spindle.

However, in order to maintain installation and rigidity, reduce manufacturing cost, promote assembly convenience, and prevent the clamping unit from being damaged by excessive electromagnetic force, the entire housing part or a part of the housing part or the flange part of the housing part itself is not an electromagnet. The clamping unit may separately include an electromagnet 310 installed on the flange portion of the housing.

That is, the electromagnet 310 may have a predetermined rigidity and may be formed of a magnetic material. In addition, the electromagnet unit 310 is installed in a part of the housing unit and performs a function of pulling the slide unit into contact with or close to the housing unit by electromagnetic force generated by the supplied power. Preferably, the electromagnet unit 310 generates an electromagnetic force by power supplied through a power supply unit or an auxiliary power supply unit fixedly installed on the flange unit 212 to attract the body unit of the slide unit.

A part of the slide unit 320 is coupled to the housing unit 210 so as to move forward and backward in the horizontal direction. Preferably, the slide part 320 is formed in an L-shape as a whole. That is, when power is supplied to the electromagnet part or the flange part of the housing part, the magnetic slide part moves forward (moves to the left in the X-axis direction in FIGS. 6 to 9) so that the magnetic slide part is adjacent to or in contact with the housing part by electromagnetic force. Part or all of the slide unit 320 may have a predetermined rigidity and may be formed of a magnetic material.

A part of the support part 330 is coupled to the housing part so that it can move up and down in the vertical direction according to the forward and backward movement of the slide part 320 . That is, when power is supplied to the flange part of the electromagnet part or the housing part and the slide part moves forward by electromagnetic force, the support part moves downward in the vertical direction by the engagement of the inclined surface and the tapered surface to be described later (in the Y-axis direction in FIGS. 6 to 9 ). moves downward), and when the power supply to the flange part of the electromagnet part or the housing part is cut off, it moves upward in the vertical direction by the elastic restoring force of the return part (moves upward in the Y-axis direction in FIGS. 6 to 9). Part or all of the support part 33 may be formed of a non-magnetic material.

The clamping part 340 is formed in the lower part of the support part so as to contact or separate from the rotation part 110 according to the vertical direction elevating movement of the support part 330 . That is, the clamping part 340 is formed to be detachably attached to the lower part of the support part and is in contact with or spaced apart from the rotating part in conjunction with the vertical direction elevating movement of the support part. Specifically, when the spindle is clamped, it is in contact with the rotating part to block the rotation of the spindle by frictional force, and when the spindle is unclamped, it is spaced apart from the swivel part to allow the spindle to rotate. Although not necessarily limited thereto, the clamping part is formed of a material that increases frictional force and is detachably formed on the lower part of the support part, particularly the lower surface of the base part, so that when the electromagnetic force is weakened by the sensing part to be described later, it can be exchanged according to an exchange signal. Accordingly, damage and breakage caused by friction between the rotating part and the support part can be prevented in advance, and machining precision can be maximized through accurate and safe spindle clamping.

The return part 350 is installed between a part of the housing part and the support part in order to return the support part 330 to its original position when the power supplied to the housing part 210 or the electromagnet part 310 is cut off. Press elastic to move upward in the direction. Preferably, the return part 35 moves the support part 330 up in the vertical direction when the power supplied to the flange part 212 or the electromagnet part 310 of the housing part is cut off to elastically press the support part 330 to return to the original position. It is formed of a coil spring or a plate spring and is installed between the stepped portion 213 of the housing portion and the coupling portion 334 of the support portion to elastically press the coupling portion 334 of the support portion to upwardly move in the vertical direction. In addition, the elastic restoring force of the return part is formed to be smaller than the electromagnetic force generated when power is supplied to the electromagnet part, a part of the housing, or the flange part. Accordingly, when the power supply to the electromagnet or flange is cut off, the support part moves upward in the vertical direction by the elastic restoring force of the return part, and the body part of the slide part moves backward by the engagement of the tapered surface of the support part and the inclined surface of the slide part, and at the same time clamping The additional rotating part is spaced apart from the rotating part to allow rotation of the spindle. Conversely, when power is supplied, the electromagnetic force overcomes the elastic restoring force and the support part moves downward in the vertical direction, and the clamping part presses the rotating part to block the rotation of the rotating part. Therefore, through a simple structure through the structure, arrangement and operating principle of the return unit, the slide unit and the support unit are returned to their original positions to achieve unclamping of the spindle. can save

Therefore, in the spindle clamping device of the machine tool according to the present invention, in order to prevent rotation of the spindle for C-axis machining, the electromagnetic force supplied to the housing part of the electromagnet part or the support part of the clamping unit and the support part by the engaging structure of the inclined surface and the tapered surface By blocking the rotation of the rotating part of the spindle, clamping the spindle, and releasing the rotation of the rotating part by the elastic restoring force of the return part and the engaging structure of the inclined and tapered surfaces to perform unclamping of the spindle, unnecessary equipment such as hydraulic lines and configuration Since the clamping unit is installed in the support part by eliminating

The spindle clamping device of the machine tool according to the present invention is the rotating part of the support part by the electromagnetic force supplied to the electromagnet part of the clamping unit or the housing part of the support part and the engaging structure of the inclined surface and the tapered surface in order to prevent the rotation of the spindle for C-axis machining. By blocking the rotation of the spindle to clamp the spindle, and release the rotation of the rotating part by the elastic restoring force of the return part and the engaging structure of the inclined and tapered surfaces to perform unclamping of the spindle, unnecessary equipment and configurations such as hydraulic lines are excluded. And the clamping unit is installed in the support part to simplify the structure to reduce the size and weight of the spindle clamping device, reduce the manufacturing cost, maximize the space utilization, and adjust the power of the power supplied to the electromagnet or the housing part to control the C-axis By effectively controlling the clamping force of the spindle required for machining, the clamping force of the spindle is set in an optimal state according to the machining conditions, and the set clamping force is kept constant, thereby improving the safety and reliability of the machine tool and increasing the machining precision. can do it

2 and 4 to 9, the clamping unit 300 of the spindle device 1 of the machine tool according to the present invention further includes a sensing unit 360 and/or an auxiliary power supply unit 370. can do.

The sensing unit 360 is installed adjacent to the electromagnet in a part of the housing to measure the strength of the magnetic field of the electromagnet, and measures the strength of the magnetic field when power is supplied to the electromagnet. That is, the sensing unit 360 is installed on the flange portion to be adjacent to the electromagnet portion, and when power is supplied to the flange portion of the electromagnet portion or the housing portion and electromagnetic force is generated, the strength of the magnetic field is measured and, if there is a change of more than a certain value, it is transmitted to the controller It informs the operator or user when to replace the clamping part through an alarm. Specifically, when the clamping part is worn by repeated contact with the rotating part, the gap (L2 in FIG. 7) between the main body part and the electromagnet part of the slide part is reduced, and as a change in the magnetic field occurs, the sensing part is formed between the body part and the electromagnetic part. The magnetic field strength according to the change in the gap between the stones is measured and compared with the reference value, and if there is a difference, it is transmitted to the control unit and a signal is transmitted to the operator through an alarm, etc. As such, the spindle clamping device of the machine tool according to the present invention confirms the wear state of the clamping part with the sensing part and informs the operator of the replacement time through an alarm in advance, thereby promoting the convenience of the operator, improving the processing precision, and equipment It can prevent damage or breakage of equipment in advance and prevent safety accidents.

The auxiliary power supply unit 370 supplies power to the electromagnet unit in an emergency. That is, the auxiliary power supply unit 370 is the clamping of the spindle is released as the power supply to the electromagnet unit or the flange unit is suddenly stopped when the power supply unit is damaged or does not work, and the spindle rotates to damage the material or damage the tool. In order to prevent damage or damage, it stably supplies power to the electromagnet part or the flange part in an emergency such as a power outage to keep the spindle clamping safely.

Accordingly, even when the power supply is suddenly interrupted through the power supply, power is stably supplied by the auxiliary power supply to prevent the material or tool from dropping or damaging the tool as the spindle rotates abruptly, and prevents equipment malfunction. Thus, it is possible to minimize damage to materials and machines, prevent safety accidents in advance, and improve the stability and reliability of machine tools.

In addition, although not shown in the drawings, the clamping unit further includes a control unit, and the control unit is the strength or direction of current supplied from the power supply unit or the auxiliary power supply unit to the electromagnet unit or a part of the housing unit formed of a magnetic material or the flange unit. to control

2 to 3 and 6 to 9, the housing portion 210 of the support portion 200 of the spindle device 1 of the machine tool according to the present invention is a through-groove portion 211, a flange portion 212 ), and a step portion 213 .

The through-groove portion 211 is formed through a portion of the housing portion 210 . That is, the through-groove portion 211 is formed to penetrate to have a predetermined diameter along the circumferential surface of the housing portion 210 so as to be spaced apart from the circumferential surface of the housing portion 210 by a predetermined distance. The through hole 211 provides an installation space so that a part of the main body 321 of the slide part, which will be described later, is coupled to the housing to be movable forward and backward in the horizontal direction.

The flange portion 212 is formed to protrude in a radial direction inside one side of the housing portion 210 in the horizontal direction and extend in the horizontal direction. The flange part 212 may provide a space in which an electromagnet part 310 to be described later is installed, or the flange part itself may be formed of an electromagnet of a magnetic material.

The step portion 213 is formed to extend in the horizontal direction in a vertically stepped state inside the other side of the housing portion 210 in the horizontal direction. The step portion 213 provides an installation space so that the coupling portion 334 of the support portion, which will be described later, is coupled to the housing to be movable up and down in the vertical direction, and at the same time forms a space in which the return portion is installed between the coupling portion and the step portion. .

2 to 4 and 6 to 9, the slide part 320 of the clamping unit of the spindle clamping device 1 of the machine tool according to the present invention is a body part 321, a bending part 322 , and an inclined surface 323 .

The body part 321 is inserted and coupled to the through-groove part 211 so as to be movable forward and backward in the horizontal direction, and the body part has a predetermined rigidity and is formed of a magnetic material. That is, when a part of the body part 321 is inserted and coupled to the through-groove part 211 and power is supplied to the electromagnet part or a part of the housing part or the flange part through the power supply part or the auxiliary power supply part, the body part 321 is formed by electromagnetic force. It moves forward in the horizontal direction along the through-groove part 211 (see FIG. 7).

The bent portion 322 is bent at the front end of the body portion to extend in the vertical direction. That is, the bent portion 322 is bent at a right angle at the tip that is not inserted into the through-groove portion of the body portion and is formed to extend in the vertical direction.

The inclined surface 323 is formed to be inclined at a predetermined angle to the tip of the bent part.

2, 3, 5 and 6 to 9, the support portion 330 of the clamping unit of the spindle clamping device 1 of the machine tool according to the present invention is a base portion 331, a receiving portion 332 , a tapered surface 333 , and an engaging portion 334 .

The base part 331 forms the overall outer shape of the support part. Although not necessarily limited thereto, preferably, the base part is formed in a rectangular parallelepiped shape as a full chuck, and the lower part of the base part is formed to be bent at the same curvature as the outer circumferential surface of the rotating part.

The receiving part 332 is recessed in a part of the base part in the width direction and the vertical direction to form a space in which the bent part is seated. That is, the accommodating part 332 is recessed in a part of the base part in a shape corresponding to the bent part so as to complement the bent part to accommodate the bent part.

The tapered surface 333 is formed to be inclined at an angle corresponding to the inclined surface at the front end of the receiving part to engage the inclined surface. That is, the tapered surface 333 is formed such that the inclination angle is opposite to the inclination angle of the inclined surface. Specifically, the tapered surface and the inclined surface are engaged to form an opposite angle to each other.

The coupling part 334 is formed to protrude from one side of the base part in a horizontal direction with a predetermined width, and is inserted and coupled to the housing part.

As described above, the spindle clamping device of the machine tool according to the present invention simplifies the structure in which the clamping unit is detachably installed to the support part as the slide part and the support part are formed in a detailed configuration and structure, thereby simplifying the structure of the spindle clamping device. It is possible to promote miniaturization and weight reduction, reduce manufacturing cost, and maximize space utilization.

An operating principle of the spindle clamping device 1 of a machine tool according to a preferred embodiment according to the present invention will be described with reference to FIGS. 2 to 9 .

A part of the housing part or the flange part or the body part is formed of a magnetic material, and when power is supplied to a part of the housing part, the flange part or the electromagnet part, the body part of the slide part moves forward in the horizontal direction so that the body part of the slide part contacts or approaches the electromagnet part by electromagnetic force, As the support part moves downward in the vertical direction by the engagement of the inclined surface and the tapered surface in conjunction with the forward movement of the body part, the clamping part comes into contact with the rotating part to prevent rotation of the spindle.

In addition, when the power is cut off from a part of the housing or the flange or the electromagnet, the electromagnetic force of a part of the housing or the flange or the electromagnet is released, and the return part elastically presses the support, so that the support moves upward in the vertical direction, and the support part moves upward. The main body of the slide unit moves backward in the horizontal direction so as to move away from the electromagnet by the engagement of the tapered surface and the inclined surface in conjunction with the do.

In the spindle unclamping state, as shown in FIGS. 6 and 8 , when a part of the housing part or the flange part or the electromagnet part is powered off, the electromagnetic force of a part of the housing part or the flange part or the electromagnet part is extinguished, and the force pulling the body part to the electromagnet part disappears Accordingly, the return portion provided between the stepped portion and the engaging portion elastically presses the engaging portion upward in the vertical direction. By the elastic pressurization of the return part, the base part, that is, the entire support part, moves upward in the vertical direction together with the coupling part. and the inclined surface engaged with the tapered surface moves downward along the tapered surface, and the entire slide part including the body part and the bent part moves backwards away from the housing part. (X-axis rightward movement in FIGS. 6 and 8) The clamping part formed on the lower part of the base part interlocks with the upward movement in the vertical direction of the part and the clamping part is spaced apart from the rotation part by a predetermined distance in conjunction with the upward movement of the support part in the vertical direction (K1 in FIGS. Upon entering the state, the spindle changes to the unclamped state.

Conversely, the spindle clamping state is as shown in FIGS. 7 and 9 , when power is supplied to a part of the housing, the flange, or the electromagnet, the body of the slide part is part of the housing part or the flange part by the electromagnetic force with the body part formed of a magnetic material. Alternatively, it moves forward in the horizontal direction so as to come into contact with or close to the electromagnet. (X-axis leftward movement in FIGS. 7 and 9) In addition, in conjunction with the forward movement of the main body, the inclined surface rises, and the taper surface engaged with the inclined surface forms the inclined surface. As it moves downward, the entire support part including the base part and the coupling part moves downward in the vertical direction. (Y-axis downward movement in FIGS. 7 and 9) In addition, in conjunction with the forward movement of the body part, the engagement of the inclined surface and the tapered surface The clamping part formed in the lower part of the base part in conjunction with the vertical downward movement of the support part by the The spindle changes to the clamping state.

Specifically, during unclamping, as shown in FIGS. 6 and 8, the support part moves upward in the vertical direction by the elastic restoring force of the return part (moves so that the distance between the coupling part and the stepped part becomes S2 in FIG. 8). In conjunction with this, the tapered surface rises, and the inclined surface engaged with the tapered surface moves downward along the tapered surface, so that the body part moves backward in the horizontal direction so as to be farther from the electromagnet part or the flange part (in FIG. 6, the distance between the electromagnet part and the body part is move to L1). In addition, according to the vertical upward movement of the support part, the clamping part and the rotating part formed on the lower part of the base part are spaced apart by a predetermined distance (moved so that the distance between the clamping part and the rotating part is K1 in FIGS. 6 and 8), so that the spindle is unclamped do.

Conversely, during clamping, as shown in FIGS. 7 and 9, the electromagnetic force generated between the main body and the main body by power supplied to a part of the housing, the flange, or the electromagnet overcomes the elastic restoring force of the return, so that the main body is horizontally oriented. to move forward (moved so that the distance between the electromagnet part and the body part in FIG. 7 becomes L2). In conjunction with this, the inclined surface rises, and the taper surface engaged with the inclined surface moves downward along the inclined surface, and the entire support part including the base part and the coupling part moves downward in the vertical direction. In addition, according to the vertical downward movement of the support part, the clamping part formed on the lower part of the base part moves downward in the vertical direction, and the spindle is clamped by contacting the rotating part. (In FIGS. 7 and 9, the distance between the clamping part and the rotating part is K2. move as much as possible), that is, the slide part, the support part, and the coupling part electromagnet are moved by electromagnetic force or the elastic restoring force of the return part so that L1 > L2, K1 > K2, S2 > S1.

As such, in the spindle clamping device of the machine tool according to the present invention, the electromagnetic force supplied to the housing part of the electromagnet or the support part of the clamping unit to prevent rotation of the spindle for C-axis machining and the support part by the engaging structure of the inclined surface and the tapered surface By blocking the rotation of the rotating part of the spindle, clamping the spindle, and releasing the rotation of the rotating part by the elastic restoring force of the return part and the engaging structure of the inclined and tapered surfaces to perform unclamping of the spindle, unnecessary equipment such as hydraulic lines and configuration In C-axis machining, the structure is simplified as the clamping unit is installed in the support part by eliminating By effectively controlling the required clamping force of the spindle, the clamping force of the spindle is set in an optimal state according to the machining conditions, and the set clamping force is kept constant, thereby improving the safety and reliability of the machine tool and increasing the machining precision. .

In the detailed description of the present invention described above, it has been described with reference to preferred embodiments of the present invention, but those skilled in the art or those having ordinary knowledge in the technical field of the present invention described in the claims to be described later It will be understood that various modifications and variations of the present invention can be made without departing from the spirit and scope of the present invention. Accordingly, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

1: spindle clamping device;
100: spindle, 110: rotating part,
200: support, 210: housing,
300: clamping unit, 310: electromagnet,
320: slide part, 330: support part,
340: clamping part, 350: return part,
360: sensing unit, 370: auxiliary power supply.

Claims (13)

spindle to rotate the material;
a support installed adjacent to the spindle; and
a clamping unit installed on the support part; and
The clamping unit is a spindle clamping device for a machine tool, characterized in that for clamping the spindle to prevent rotation of the spindle by coupling the spindle and the support by electromagnetic force by the supplied power.
According to claim 1,
The spindle includes a rotating part having one side coupled to the spindle so as to rotate in association with the spindle;
The support part is a housing part disposed on the other side of the rotating part; Spindle clamping device for a machine tool comprising a.
3. The method of claim 2,
The clamping unit is
a slide part coupled to the housing part so as to be able to move forward and backward in a horizontal direction to the housing part;
a support part coupled to the housing part so as to move vertically in the vertical direction according to the forward/backward movement of the slide part; and
Spindle clamping device of a machine tool comprising a; a clamping portion formed under the support portion to contact or spaced apart from the rotating portion according to the vertical elevation movement of the support portion.
4. The method of claim 3,
At least one part of the housing part is formed of an electromagnet,
The clamping unit advances and moves the slide part in a horizontal direction so that the slide part comes into contact with or close to the housing part by electromagnetic force from the power supplied to the housing part during drilling or contour processing of the material, and the slide part is horizontal. Spindle clamping device for a machine tool, characterized in that as the support part moves downward in the vertical direction according to the forward movement, the clamping part comes into contact with the rotating part to prevent rotation of the spindle.
4. The method of claim 3,
The clamping unit is
and an electromagnet part installed in a part of the housing part and pulling the slide part to contact or close to the housing part by electromagnetic force from the supplied power.
6. The method of claim 3 or 5,
The clamping unit is
When the power supplied to the housing part or the electromagnet part is cut off, a return part is installed between a part of the housing part and the support part to return the support part and elastically pressurizes the support part to move upwardly in the vertical direction; includes; Spindle clamping device of a machine tool, characterized in that.
6. The method of claim 5,
The clamping unit is
and a sensing part installed adjacent to the electromagnet part in a part of the housing part to measure the strength of the magnetic field of the electromagnet part.
6. The method of claim 5,
The housing part,
a through-groove formed through a portion of the housing;
a flange portion formed inside one side of the housing portion; and
A spindle clamping device for a machine tool comprising a; a step portion formed to be stepped inside the other side of the housing portion.
9. The method of claim 8,
The slide part,
a body part inserted and coupled to the through-groove so as to be movable forward and backward in a horizontal direction;
a bent part bent at the front end of the body part to extend in a vertical direction; and
A spindle clamping device for a machine tool comprising a; an inclined surface formed to be inclined at a predetermined angle at the tip of the bent part.
10. The method of claim 9,
The support unit,
base part;
a receiving part which is recessed in a part of the base part to seat the bent part;
a tapered surface inclined at an angle corresponding to the inclined surface at the front end of the receiving part to engage the inclined surface; and
The spindle clamping device of a machine tool comprising a; a coupling portion extending to protrude from one side of the base portion and inserted and coupled to the housing portion.
11. The method of claim 10,
The body portion is formed of a magnetic material,
When power is supplied to the electromagnet part, the main body part of the slide part moves forward in a horizontal direction so that it contacts or approaches the electromagnet part by electromagnetic force, and in conjunction with the forward movement of the body part, by the engagement of the inclined surface and the tapered surface As the support part moves downward in the vertical direction, the clamping part comes into contact with the rotating part to prevent rotation of the spindle.
12. The method of claim 11,
When the power to the electromagnet unit is cut off, the electromagnetic force of the electromagnet unit is released, and the return unit elastically presses the support unit so that the support unit moves upward in the vertical direction. The main body of the slide part moves backward in the horizontal direction so as to be away from the electromagnet part by engagement, and the contact between the clamping part and the rotating part is released according to the vertical upward movement of the support part, so that the rotation of the spindle is allowed. A spindle clamping device for a machine tool with
7. The method of claim 6,
The clamping unit is
A spindle clamping device for a machine tool, characterized in that it further comprises; an auxiliary power supply for supplying power to the electromagnet in an emergency.

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