KR102347406B1 - Tool clamping device of machine tool - Google Patents

Abstract

The present invention is a bed; a frame formed on one side of the bed; a first slide cover movably installed in the frame in a horizontal direction; a second slide cover that is vertically movably installed on a part of the first slide cover; a wiper part having a space therein and installed in a part of the second slide cover; a tool storage unit movably installed in a horizontal direction on a part of the frame; a tool unit detachably accommodated in the tool storage unit; and a clamping part installed in the space part of the wiper part and clamping or unclamping the tool part by horizontal movement of the tool storage part accommodating the tool part and vertical movement of the wiper part; is about

Description

Tool clamping device of machine tool

The present invention relates to a tool clamping device for a machine tool, and more particularly, by clamping or unclamping the tool part by horizontal movement of the tool storage part accommodating the clamping part and vertical movement of the wiper part, the repeatability of the tool and the tool It relates to a tool of a machine tool capable of increasing holding force, in particular, a long boring bar clamping device for a machine tool.

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 types of machining 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 main shaft that a tool or workpiece is combined with and rotates, 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 conveying along a conveying axis in order to perform various machining.

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 number of tools for various processing, and a tool magazine is used in the form of a tool storage place for storing and 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.

The conventional tool clamping device of a machine tool has a problem in that the repeatability of the tool decreases as the spacing between the clamping part and the tool part increases for clamping the tool, and thus the processing precision and productivity are significantly reduced.

In addition, the tool clamping device of the conventional machine tool decreases the tool clamping force when clamping the tool according to the increase of the separation space, and unlike a small or light-weight tool, a long boring bar with a large size or a relatively heavy weight. In the case of a large tool such as a bar), there is a problem in that the tool holding force is reduced during clamping, so that the tool falls during transport, resulting in damage to the tool or a safety accident.

Moreover, the conventional tool clamping device of a machine tool has a problem in that the cutting force of the tool is reduced according to the decrease in the tool holding force, so that the productivity is lowered and the maintenance cost of the machine tool is increased.

In addition, in the tool clamping device of the conventional machine tool, chips and cutting oil generated during machining flow into the back of the slide cover to damage or contaminate other parts according to the increase in the separation space, thereby increasing the maintenance cost and reducing user inconvenience and dissatisfaction. There were problems that caused it.

Korean Patent Laid-Open Publication No. 10-2005-0000707 Korean Patent Publication No. 10-2015-0072867

The present invention is to solve the above problems, and an object of the present invention is to move the tool storage unit accommodating the tool unit horizontally to the left, and move the wiper unit vertically downward, so that the coupling unit is inserted into the clamping unit through the opening. In this case, the cylinder part moves vertically downward by the second elastic member, the locking part contacts the tapered part and the inclined surface, the clamping part clamps the tool part, the wiper part moves vertically upward, and the tool storage part moves horizontally to the right to open the coupling part. When the clamping part is detached from the clamping part through the part, the second piston part moves vertically downward by the first elastic member and the locking part slides to the seating part while separating from the tapered part and the inclined surface. As the clamping part unclamps the tool part, the tool is repeated. To provide a tool clamping device for machine tools that can improve precision, increase tool holding force, prevent the tool from falling, and minimize the separation space to prevent chips and coolant from entering, thereby maximizing the stability of the machine tool. will be.

In order to achieve the object of the present invention, the tool clamping device of the machine tool according to the present invention is a bed; a frame formed on one side of the bed; a first slide cover movably installed in the frame in a horizontal direction; a second slide cover that is vertically movably installed on a part of the first slide cover; a wiper part having a space therein and installed in a part of the second slide cover; a tool storage unit movably installed in a horizontal direction on a part of the frame; a tool unit detachably accommodated in the tool storage unit; and a clamping unit installed in the space portion of the wiper unit to clamp or unclamp the tool unit by horizontal movement of the tool storage unit accommodating the tool unit and vertical movement of the wiper unit.

In addition, in another preferred embodiment of the tool clamping device of the machine tool according to the present invention, the tool portion of the tool clamping device of the machine tool is formed with a tool rest for processing the workpiece at the tip; and a holder portion having a coupling portion having a tapered portion formed thereon, supporting the tool rest, and detachably coupled to the tool storage portion.

In addition, in another preferred embodiment of the tool clamping device of the machine tool according to the present invention, the clamping unit of the tool clamping device of the machine tool has an opening through which the coupling unit can enter and exit, and a housing portion installed in the space; a cylinder part vertically movably installed inside the housing part; a piston part installed to be vertically movable inside the cylinder part; a first elastic member installed inside the piston part to provide an elastic force to the piston part to close the opening part; and a locking part installed between the housing part and the piston part to be in contact with or to be removed from the coupling part according to the entry/exit state of the opening part of the coupling part.

In addition, in another preferred embodiment of the tool clamping device of the machine tool according to the present invention, the housing portion of the clamping unit of the tool clamping device of the machine tool is a first stepped portion formed to be stepped inside the space portion; a second stepped portion spaced apart from the first stepped portion in a vertical direction and formed to be stepped inside the space portion; and a seating portion formed in a portion of the second stepped portion.

In addition, in another preferred embodiment of the tool clamping device of the machine tool according to the present invention, the piston portion of the clamping portion of the tool clamping device of the machine tool is a first piston portion fixed to one side is installed in the space portion; and a second piston part that surrounds the first piston part, opens or closes the opening part while the lower part moves vertically along the outer circumferential surface of the first piston part by the first elastic member, and a flange part is formed on the upper part; and , The first elastic member may be installed between the first piston part and the second piston part.

In addition, in another preferred embodiment of the tool clamping device of the machine tool according to the present invention, the cylinder portion of the clamping portion of the tool clamping device of the machine tool is formed under the cylinder portion to contact the locking portion according to the vertical movement of the cylinder portion. incline; and a locking jaw formed on the inner surface of the cylinder part and in contact with the flange part when the second piston part moves vertically.

In addition, in another preferred embodiment of the tool clamping device of the machine tool according to the present invention, the tool clamping device of the machine tool is installed between the wiper part and the cylinder part inside the space part to provide an elastic force to the cylinder part It may further include a second elastic member.

In addition, in another preferred embodiment of the tool clamping device for a machine tool according to the present invention, the tool clamping device for the machine tool is configured to include the cylinder by the second elastic member when the engaging portion is inserted into the clamping portion through the opening portion. When the part moves vertically downward, the locking part comes into contact with the tapered part and the inclined surface to clamp the tool part, and when the coupling part is detached to the outside of the clamping part through the opening part, the second piston by the first elastic member As the part moves vertically downward, the locking part is slid to the seating part while separating from the tapered part and the inclined surface to unclamp the tool part.

In addition, in another preferred embodiment of the tool clamping device for a machine tool according to the present invention, the tool clamping device for the machine tool is configured to include the cylinder by the second elastic member when the engaging portion is inserted into the clamping portion through the opening portion. When the part moves vertically downward, the locking part comes into contact with the tapered part and the inclined surface to clamp the tool part, and when hydraulic pressure is introduced between the first stepped part and the cylinder part, the cylinder part moves vertically upward by the hydraulic pressure. As the locking part is separated from the tapered part and the inclined surface, the locking part is slid to the seating part so that the tool part moves vertically downward by its own weight and the wiper part moves vertically upward to unclamp the tool part.

In the tool clamping device for a machine tool according to the present invention, when the tool storage unit accommodating the tool unit moves horizontally to the left, the wiper unit moves vertically downward, and the coupling unit is inserted into the clamping unit through the opening, the second elastic member As a result, the cylinder part moves vertically downward, the locking part comes into contact with the tapered part and the inclined surface, the clamping part clamps the tool part, the wiper part moves vertically upward, and the tool storage part moves horizontally to the right, and the coupling part is removed from the clamping part through the opening part. In this case, the second piston part moves vertically downward by the first elastic member and the locking part slides to the seating part while separating from the tapered part and the inclined surface. There is an improvement effect.

In addition, the tool clamping device of a machine tool according to the present invention increases the tool clamping force of a tool such as a long boring bar that is relatively heavy by double boosting force according to the contact between the piston part and the cylinder part and the two elastic members and the locking part. There is an effect of increasing the productivity of the machine tool by improving the machinability.

Moreover, the tool clamping device of the machine tool according to the present invention prevents the tool from being separated from the clamping part and falling during the movement of the tool or the machining of the workpiece according to the increase in the tool clamping force, and prevents safety accidents caused by the fall of the tool in advance. It has the effect of reducing the maintenance cost and production cost of the machine tool by preventing damage to the tool due to the fall of the tool.

In addition, the tool clamping device of the machine tool according to the present invention minimizes the separation space for clamping and blocks the inflow of chips and coolant into the back of the slide cover, thereby maximizing the stability of the machine tool, reducing the maintenance cost, and There is an effect of preventing the trouble of removing the cutting oil due to the inflow of the cutting oil, thereby promoting user convenience.

1 shows a perspective view of a tool clamping device of a machine tool according to an embodiment of the present invention.
2 to 4 are perspective views for explaining the clamping / unclamping process of the tool clamping device of the machine tool according to an embodiment of the present invention.
5 is a side view showing a state in which the tool part is clamped to the clamping part of the tool clamping device of the machine tool according to an embodiment of the present invention.
6 is a partial perspective view of a state in which the tool part is clamped to the clamping part of the tool clamping device of the machine tool according to an embodiment of the present invention.
7 is an enlarged view of part A of FIG. 6 .
8 is an enlarged view of part A in a state in which the tool part is unclamped to the clamping part of the tool clamping device of the machine tool according to an embodiment of the present invention.

Hereinafter, with reference to the drawings of the prefabricated pillow 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 a variety of different forms, only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field 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. In this specification, 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.

1 shows a perspective view of a tool clamping device of a machine tool according to an embodiment of the present invention, and FIGS. 2 to 4 describe a clamping / unclamping process of the tool clamping device of a machine tool according to an embodiment of the present invention A perspective view is shown for 5 is a side view showing a state in which the tool part is clamped to the clamping part of the tool clamping device of the machine tool according to an embodiment of the present invention, and FIG. 6 is a clamping of the tool clamping device of the machine tool according to an embodiment of the present invention. The part shows a partial perspective view of the clamped state of the tool part. 7 shows an enlarged view of part A of FIG. 6 , and FIG. 8 shows an enlarged view of part A in a state in which the tool part is unclamped to the clamping part of the tool clamping device of a machine tool according to an embodiment of the present invention.

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. 1 to 8, and "vertical direction" means the vertical direction in the same member while perpendicular to the horizontal direction, that is, Y in FIGS. It means an axial direction, and "width direction" means a vertical direction in the same member while being orthogonal to a horizontal direction and a vertical direction. In addition, upward means the upward direction in the "vertical direction", that is, the direction toward the upper side of the Y-axis in FIGS. means the direction it is going. In addition, the inner side means a side relatively close to the center of the same member, that is, the inside of the space in FIGS. 1 to 8 .

A tool clamping device 1 of a machine tool according to an embodiment of the present invention will be described with reference to FIGS. 1 to 8 . 1 to 6, the tool clamping device 1 of a machine tool according to an embodiment of the present invention includes a bed 100, a frame 200, a first slide cover 300, and a second slide cover. 400 , a wiper unit 500 , a tool storage unit 600 , a tool unit 700 , and a clamping unit 800 .

The bed 100 is installed on the ground. Various structures for processing a workpiece in a machine tool are installed in the bed 100 . 1 to 4, the main shaft 2 for processing the workpiece is installed on one side of the bed 100, and supports the workpiece when processing the workpiece on the spindle 2 on the other side of the bed 100. A tailstock 40 may be installed to Although not necessarily limited thereto, the main shaft 2 and the tailstock 40 are installed to move horizontally or vertically along the bed 100 by a separate transfer unit.

It is formed on one side of the bed 100 of the frame 200 . Although not necessarily limited thereto, the frame 200 is formed on one side of the bed 100 in the form of a rectangular or circular metal bar so that the first slide cover 300 and the second slide cover 400 to be described later can be moved. Provides space for installation.

The first slide cover 300 is movably installed in the frame 200 in a horizontal direction (X-axis direction).

The second slide cover 400 is installed to be movable in a vertical direction (Y-axis direction) on a part of the first slide cover 300 . That is, the second slide cover 400 moves left and right (X-axis direction) in FIGS. 1 to 8 by the horizontal direction (X-axis) movement of the first slide cover 300 while moving up and down in FIGS. 1 to 8 ( in the Y-axis direction).

The wiper part 500 has a space part 510 therein, and is installed in a part of the second slide cover 400 . That is, the wiper part 500 is installed on a part of the second slide cover 400 so that the second slide cover 400 can vertically move integrally with the second slide cover 400 when the second slide cover 400 moves up and down.

The tool storage unit 600 is installed in a part of the frame 200 to be movable in the horizontal direction (X-axis direction). That is, the tool storage unit 600 is installed in a part of the frame 200 so as to move in the left and right directions in FIGS. 1 to 8 in a state in which the tool unit 700 is accommodated. Although not necessarily limited thereto, the tool storage unit 600 is installed in a part of the frame 200 to be horizontally movable by a rack and pinion, an LM guide rail, a ball screw, and the like.

The tool part 700 is detachably accommodated in the tool storage part 700 .

1 to 7 , the tool unit 700 according to an embodiment of the present invention includes a tool rest 710 and a holder unit 720 .

The tool rest 710 is formed with a tool 711 for processing the workpiece at the tip.

The holder unit 720 supports the tool rest 710 and is detachably coupled to the tool storage unit. Although not necessarily limited thereto, the holder part 720 is formed in a hollow rectangular parallelepiped shape, and the tool rest 710 is inserted and fastened. A coupling portion 721 having a tapered portion 722 is formed to protrude from the upper surface of the holder portion 720 . The coupling part 721 is formed in the form of a pull stud, and can be clamped or unclamped while easily entering and exiting the clamping part 800 to be described later.

The clamping part 800 is inserted and installed in the space part 510 of the wiper part 500 . The clamping part 800 is inserted and installed in the hollow space 510 formed at the lower end of the wiper part 500 . 7 to 8 , preferably, the clamping part 800 is inserted into the space 510 of the wiper part 500 to prevent the clamping part 800 from being separated from the space 510 . In order to prevent it, it may be firmly fixedly coupled to the wiper part 500 by the fastening member 5 . Accordingly, as the clamping part 800 is primarily and firmly fixedly coupled to the space part 510 of the wiper part 500 , the tool rest 700 is more firmly and stably clamped during clamping of the tool rest 700 . can do.

1 to 8, the clamping part 800 of the tool clamping device 1 of the machine tool according to an embodiment of the present invention includes a housing part 810, a cylinder part 820, and a piston part 830. , a first elastic member 840 , and a locking part 850 . In addition, as shown in FIGS. 7 to 8 , the clamping part 800 of the tool clamping device 1 of a machine tool according to another embodiment of the present invention may further include a second elastic member 860 .

The housing part 810 is a tool part according to the vertical movement of the wiper part 500 and the left and right movement of the tool storage part 600 by the clamping part 800 inserted and installed in the space part 510 at the lower end of the wiper part 500 . An opening 811 through which the coupling portion 721 of the holder portion 720 of the 700 can enter and exit is provided at one end of the housing portion 810 . That is, the housing part 810 is provided with an opening 811 at the lower end of the housing part 810 through which the coupling part 721 can enter and exit, and is inserted and installed in the space part 510 of the wiper part 500 , , is fastened to the wiper unit 500 by the fastening member 5 . Although not necessarily limited thereto, the fastening member 5 may be formed of bolts, rivets, or the like.

The cylinder part 820 has a hollow shape and is vertically movable inside the housing part 810 . That is, the cylinder part 820 is formed in a hollow shape so that a piston part 830 to be described later can be inserted therein, and the housing part 810 so that it can rise or fall according to the entry and exit of the coupling part 721 . It is installed inside the housing part 810 so as to be vertically movable from the inside.

The piston part 830 is formed in a hollow shape, and is vertically movable inside the cylinder part 820 . That is, the piston part 830 is formed in a hollow shape so that a first elastic member 840, which will be described later, can be inserted therein, and the cylinder part 820 so that it can rise or fall according to the entry and exit of the coupling part 721 . ) is installed on the inside of the cylinder part 820 so that it can move vertically up and down in the interior.

The first elastic member 840 is installed inside the piston part 830 so that the piston part 830 closes the opening part 811 in a state in which the coupling part 721 is not inserted through the opening part 811 . Provides elasticity. That is, the first elastic member 840 provides an elastic force in the direction of vertically downwardly pressing the second piston part 832 to be described later in FIGS. 7 to 8 .

Accordingly, when the coupling part 721 is removed, the second piston part 832 closes the opening part 811 by the elastic force of the first elastic member 840, so that chips or cutting oil enter the clamping part 800 during processing. can be prevented from entering. Although not necessarily limited thereto, the first elastic member 840 may be formed of a compression spring such as a coil spring.

The locking part 850 is installed between the housing part 810 and the piston part 830 and comes into contact with or detached from the coupling part 721 according to the entry/exit state of the open part 811 of the coupling part 721 . That is, the locking part 850 supports or removes the coupling part 721 while in contact with the coupling part 721 of the holder part 720 of the tool part 700 to firmly clamp or unclamp the tool part 700 . can do.

Although not necessarily limited thereto, the locking part 850 is formed of a ball, and is installed as a pair on the seating part 814 to be described later as a pair around the piston part 830 to connect the coupling part 721 . It can be fixed and supported more firmly.

The second elastic member 860 is installed between a portion of the inner surface of the wiper part 500 and the top surface of the cylinder part 820 inside the space part 510 to provide an elastic force to the cylinder part 820 . That is, as shown in FIG. 7 , the second elastic member 860 provides an elastic force in a direction for vertically downwardly pressing the cylinder part 820 . By maintaining the emergency clamping force by the second elastic member 860, it is possible to prevent the tool from falling during movement or to prevent a safety accident, and to reduce the maintenance cost due to tool breakage.

As shown in FIG. 7 , the second elastic member 860 presses the first elastic member 840 by the insertion of the coupling part 721 when the coupling part 721 is inserted into the opening part 811 to make the second elastic member 860. 2 The piston 832 moves vertically upward, and accordingly, the flange part 833 does not press the engaging jaw part 822 , and the cylinder part 820 moves vertically downward by the elastic force of the second elastic member 860 . and pressing the locking part 850 with the tapered part 722 of the coupling part 721 while the inclined surface of the cylinder part 820 and a part of the locking part 850 come into contact with the tool part 700 by double boosting force. can be clamped. Although not necessarily limited thereto, the second elastic member 860 may be formed of a compression spring such as a coil spring.

Therefore, the tool clamping device of the machine tool according to the present invention prevents the tool from being separated from the clamping part and falling during the movement of the tool or the processing of the workpiece according to the increase in the tool clamping force, and prevents a safety accident due to the fall of the tool in advance. It is possible to reduce the maintenance cost and production cost of the machine tool by preventing damage to the tool due to the fall of the tool.

7 to 8, the housing portion 810 of the clamping portion 800 of the tool clamping device 1 of the machine tool according to an embodiment of the present invention is a first stepped portion 812, the second It may further include a short portion 813 and a seating portion 814 .

The first stepped portion 812 is formed to be stepped inside of the space portion 510 . That is, the piston part 830 is specifically formed to be stepped in the central axis direction of the second piston part 832 so that the cylinder part 820 is seated when the tool part 700 is clamped. Therefore, the first stepped portion 812 performs a stopper function so that the cylinder portion 820 is not separated when the cylinder portion 820 moves vertically downward.

The second stepped portion 813 is vertically spaced apart from the first stepped portion 812 , and is formed to be stepped inside the space portion 510 . That is, the installation space of the locking part 850 is secured during unclamping, the inclined surface 821 of the cylinder 820 presses the locking part 850 during clamping, and the locking part 850 is tapered 722 . ), the piston part 830 is specifically formed to be stepped in the central axis direction of the second piston part 832 to press. Accordingly, the second stepped portion 813 secures an installation space for the locking portion 850 and the locking portion so that the locking portion 850 can be seated on the seating portion 814 when the tool portion 700 is unclamped. Performs a function of guiding (850).

The seating portion 814 is formed to be curved on an inner portion of the second stepped portion 813 . That is, the seating portion 814 is formed to be curved on the inside of the second stepped portion 813 to have a curvature corresponding to the curvature of the locking portion 850 , so that the locking portion 850 is unclamped when the tool portion 700 is unclamped. ) is located in the seating part 814, the locking part 850 presses the cylinder part 820, and the second piston part 832 together with the first elastic member 840 completely closes the opening part 811. It performs the sealing function.

Therefore, the tool clamping device of the machine tool according to the present invention minimizes the separation space for clamping and blocks the inflow of chips and cutting oil into the back of the slide cover, thereby maximizing the stability of the machine tool, reducing the maintenance cost, and It is possible to prevent the inconvenience of removing the cutting oil due to the inflow of the cutting oil, thereby improving the user's convenience.

7 to 8, the piston part 830 of the clamping part 800 of the tool clamping device 1 of the machine tool according to an embodiment of the present invention is a first piston part 831 and a second and a piston part 832 .

The first piston part 831 is inserted and installed in the wiper part 500 so that one side is fixed to the space part 510 . That is, while the first piston part 831 is positioned inside the housing part 810 and the cylinder part 820 , one end of the first piston part 831 is fixedly installed on the upper part of the space part 510 . Although not necessarily limited thereto, the first piston part 831 is formed in a hollow cylindrical shape.

The second piston part 832 surrounds the first piston part 831 and is installed inside the housing part 810 and the cylinder part 820 to vertically move along the outer peripheral surface of the first piston part 831 . That is, the second piston part 832 is raised and lowered in the vertical direction by the elastic force of the first elastic member 840 while the inner peripheral surface of the second piston part 832 is in contact with the outer peripheral surface of the first piston part 831 . 1 It is installed inside the housing part 810 and the cylinder part 820 while surrounding the piston part 831 .

The lower part of the second piston part 832 opens or closes the opening part 811 while moving in the vertical direction along the outer circumferential surface of the first piston part 831 by the elastic force of the first elastic member 840 . A flange portion 833 is formed on an upper portion of the second piston portion 832 . The flange portion 833 has the second piston portion 831 of the second piston portion 832 by the elastic force of the first elastic member 840 when the coupling portion 721 is not inserted into the open portion 811 . When the lower end moves vertically downward to close the opening 811 , a stopper function is performed to limit the moving distance of the second piston part 832 so that a gap is not formed in the opening 811 .

That is, when the second piston part 832 moves vertically downward by the flange part 833 , the second piston part 832 comes into contact with the engaging jaw part 822 of the cylinder part 820 , so that the second piston part 832 is the opening part 811 . It does not come off the bottom surface.

The first elastic member 840 is installed between the first piston part 831 and the second piston part 832 . That is, as shown in FIG. 7 , one end of the first elastic member 840 is in contact with the lower surface of the inner upper portion of the first piston part 831 , and the other end of the first elastic member 840 is the second piston part. It is installed between the first piston part 831 and the second piston part 832 so as to contact the upper surface of the inner lower part of the 832 .

7 to 8, the cylinder part 820 of the clamping part 800 of the tool clamping device 1 of the machine tool according to an embodiment of the present invention has an inclined surface 821 and a locking jaw part 822. includes

The inclined surface 821 is formed under the cylinder part 820 to press the locking part 850 while making contact with the locking part 850 according to vertical movement of the cylinder part 820 .

The locking jaw part 822 is formed on the inner surface of the cylinder part 820 and comes into contact with the flange part 833 when the second piston part 832 moves vertically downward so that the second piston part 832 opens the opening part 811 . ) to prevent it from escaping to the outside.

That is, as shown in FIGS. 7 to 8 , the tool clamping device 1 of the machine tool according to the present invention moves horizontally to the left of the tool storage unit 600 accommodating the tool unit 700 and the wiper unit 500 . ), when the coupling part 721 is inserted into the clamping part 800 through the opening part 811 by the vertical downward movement, the cylinder part 820 is vertically downward by the second elastic member 860. Moving, the locking part 850 comes into contact with the tapered part 722 and the inclined surface 821 to firmly clamp the tool part 700 , and the coupling part 721 by the vertical upward movement of the wiper part 500 . ) is removed to the outside of the clamping part 800 through the opening 811, the second piston part 832 moves vertically downward by the first elastic member 840, and the locking part 850 is tapered. The second piston part 832 closes the open part 811 while sliding away from the 722 and the inclined surface 821 to the seating part 814 , thereby unclamping the tool part 700 .

Therefore, in the tool clamping device of the machine tool according to the present invention, when the tool storage unit accommodating the tool unit moves horizontally to the left, and the wiper unit moves vertically downward, the coupling unit is inserted into the clamping unit through the opening. The cylinder part moves vertically downward by the elastic member, the locking part comes into contact with the tapered part and the inclined surface, the clamping part clamps the tool part, the wiper part moves vertically upward, and the tool storage part moves horizontally to the right. In the case of detachment with the , the second piston part moves vertically downward by the first elastic member, and the locking part slides to the seating part while separating from the tapered part and the inclined surface. The precision can be improved, and the tool clamping force of a tool such as a long boring bar that is relatively heavy is increased by the double boosting device according to the contact between the piston and the cylinder, and the two elastic members and the locking part to improve machinability. It can increase the productivity of the machine.

In addition, the tool clamping device 1 for a machine tool according to a preferred embodiment of the present invention performs horizontal movement of the tool storage unit 600 accommodating the tool unit 700 at the time of clamping the tool unit 700 and When the coupling part 721 is inserted into the clamping part 800 through the opening part 811 by the vertical downward movement of the wiper part 500, the cylinder part 820 by the second elastic member 860. moves vertically downward so that the locking part 850 comes into contact with the tapered part 722 and the inclined surface 821 to firmly clamp the tool part 700 . When the tool part 700 is unclamped, hydraulic pressure is introduced between the first stepped part 812 and the cylinder part 820, so that the cylinder part 820 moves vertically upward by the hydraulic pressure and at the same time the locking part 850 is closed. While the tapered portion 722 and the inclined surface 821 are separated from the sliding movement toward the seating portion 814, the restraint on the coupling portion 721 of the holder portion 720 is released and the tool portion 700 moves vertically downward by its own weight. , and at the same time, the wiper part 500 moves vertically upward, and the tool part 700 is separated from the clamping part 800 . At this time, the tool part 700 moves in the horizontal and vertical directions, and is naturally coupled and seated in the tool storage part 600 waiting in advance by its own weight.

Therefore, in the tool clamping device of a machine tool according to an embodiment of the present invention, the locking part is released while the cylinder part moves upward by the inflow of hydraulic pressure, the wiper part rises, and the tool part is accommodated in the tool storage part while moving by its own weight. Accordingly, it is possible to reduce the replacement time of the tool part and achieve miniaturization through a minimum configuration.

An operating principle of the tool clamping device 1 of a machine tool according to an embodiment of the present invention will be described with reference to FIGS. 1 to 8 .

1 to 8 , when the tool part 700 is clamped, the tool storage part 600 moves in the horizontal direction, that is, to the left in FIGS. 1 to 8 . Thereafter, the wiper unit 500 moves vertically downward.

Thereafter, the coupling part 721 moves the second piston part 832 vertically upward while pressing the lower end surface of the second piston part 832 . When the second piston part 832 moves vertically upward, as the flange part 833 of the second piston part 832 and the engaging jaw part 822 of the cylinder part 820 are removed, the second elastic part 860 of the The cylinder part 820 moves vertically downward by the elastic force.

At this time, the vertical downward movement distance of the cylinder part 820 is limited by the first stepped part 812 , and the locking part 850 is located on the right side of the seating part 814 by the inclined surface 821 of the cylinder part 820 . It moves to and contacts the inclined surface 821 and the tapered part 722 to firmly support the coupling part 721, thereby strongly clamping the tool part 700 by double boosting force.

1 to 8 , when the tool part 700 is unclamped, the tool storage part 600 moves to the left in the horizontal direction to hold the tool part 700 unclamped by the clamping part 800 . Prepare for storage. At the same time, hydraulic pressure is introduced between the first stepped part 812 and the cylinder part 820, and the cylinder part 820 moves vertically upward by the hydraulic pressure, and at the same time, the locking part 850 is tapered part 722 and inclined surface ( 821) and the sliding movement to the seating portion 814, while the restraint on the coupling portion 721 of the holder portion 720 is released, the tool portion 700 moves vertically downward by its own weight, and at the same time the wiper portion The coupling part 721 of the tool part 700 is removed to the outside of the opening part 811 while moving vertically upward. When the coupling part 721 is removed without pressing the second piston part 832 , the second piston part 832 moves vertically downward by the elastic force of the first elastic member 840 .

At this time, the flange portion 833 of the second piston portion 832 contacts the engaging jaw portion 822 of the cylinder portion 820 to prevent the second piston portion 832 from being separated to the outside of the opening portion 811 . While minimizing the spacing of the opening portion 811, the opening portion 811 is closed.

In this way, through the sliding motion caused by the elastic force of the first elastic member and the movement of the locking part, the tool part is unclamped quickly and easily, and at the same time, the second piston part completely seals the opening part, thereby preventing equipment damage due to the inflow of chips and cutting oil. It is possible to increase the productivity by minimizing the non-working time by reducing the tool unclamping time while minimizing it.

Therefore, the tool clamping device of the machine tool according to the present invention prevents the tool from being separated from the clamping part and falling during the movement of the tool or the processing of the workpiece according to the increase of the tool clamping force, and prevents safety accidents caused by the fall of the tool in advance. It is possible to reduce the maintenance cost and production cost of the machine tool by preventing damage to the tool due to the fall of the tool.

In the detailed description of the present invention described above, although it has been described with reference to preferred embodiments of the present invention, 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: tool clamping device, 2: spindle,
3: milling spindle, 4: tailstock,
100: bed, 200: frame,
300: a first slide cover, 400: a second slide cover,
500: wiper part, 510: space part,
600: tool storage unit, 700: tool unit,
710: tool rest, 711: tool,
720: holder part, 721: coupling part,
722: tapered part, 800: clamping part,
810: housing part, 811: open part,
812: a first stepped portion, 813: a second stepped portion,
814: seating part, 820: cylinder part,
821: inclined surface, 822: engaging jaw,
830: piston part, 831: first piston part,
832: second piston part, 833: flange part;
840: a first elastic member, 850: a locking part,
860: a second elastic member.

Claims (9)

bed;
a frame formed on one side of the bed;
a first slide cover movably installed in the frame in a horizontal direction;
a second slide cover installed on a portion of the first slide cover to be movable in a vertical direction;
a wiper part having a space therein and installed in a part of the second slide cover;
a tool storage unit movably installed in a horizontal direction on a part of the frame;
a tool unit detachably accommodated in the tool storage unit; and
A clamping part installed in the space of the wiper part and clamping or unclamping the tool part by horizontal movement of the tool storage part accommodating the tool part and vertical movement of the wiper part; tool clamping device.
According to claim 1,
The tool part,
a tool rest having a tool formed at the tip for processing a workpiece; and
A tool clamping device for a machine tool comprising a; having a coupling portion having a tapered portion formed therein, supporting the tool rest, and detachably coupled to the tool storage portion.
3. The method of claim 2,
The clamping part,
a housing part having an opening part through which the coupling part can enter and exit, and installed in the space part;
a cylinder part vertically movably installed inside the housing part;
a piston part installed to be vertically movable inside the cylinder part;
a first elastic member installed inside the piston part to provide an elastic force so that the piston part closes the opening part; and
and a locking part installed between the housing part and the piston part to come into contact with or to be removed from the coupling part according to the entry/exit state of the opening part of the coupling part.
4. The method of claim 3,
The housing part,
a first stepped portion formed to be stepped inside the space portion;
a second stepped portion spaced apart from the first stepped portion in a vertical direction and formed to be stepped inside the space portion; and
A tool clamping device for a machine tool, characterized in that it further comprises; a seating portion formed in a portion of the second stepped portion.
5. The method of claim 4,
The piston part,
a first piston part having one side fixed to the space part; and
A second piston part surrounding the first piston part, the lower part opening or closing the opening part while vertically moving along the outer circumferential surface of the first piston part by the first elastic member, and having a flange part formed thereon;
The first elastic member is a tool clamping device for a machine tool, characterized in that it is installed between the first piston part and the second piston part.
6. The method of claim 5,
The cylinder part,
an inclined surface formed under the cylinder part and contacting the locking part according to vertical movement of the cylinder part; and
and a locking jaw portion formed on the inner surface of the cylinder portion and contacting the flange portion during vertical movement of the second piston portion.
7. The method of claim 6,
A second elastic member installed between the wiper part and the cylinder part inside the space part to provide an elastic force to the cylinder part;
8. The method of claim 7,
When the coupling part is inserted into the clamping part through the opening part, the cylinder part moves vertically downward by the second elastic member so that the locking part comes into contact with the tapered part and the inclined surface to clamp the tool part;
When the coupling part is removed to the outside of the clamping part through the opening part, the second piston part moves vertically downward by the first elastic member, so that the locking part is separated from the tapered part and the inclined surface while sliding to the seating part. A tool clamping device for a machine tool, characterized in that for unclamping the tool portion. 8. The method of claim 7,
When the coupling part is inserted into the clamping part through the opening part, the cylinder part moves vertically downward by the second elastic member so that the locking part comes into contact with the tapered part and the inclined surface to clamp the tool part;
When hydraulic pressure is introduced between the first stepped part and the cylinder part, the cylinder part is moved vertically upward by the hydraulic pressure, and the locking part is slidably moved to the seating part while separating from the tapered part and the inclined surface, and the tool part is by its own weight. A tool clamping device for a machine tool, characterized in that it moves vertically downward and the wiper part unclamps the tool part while moving vertically upward.

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