KR101841185B1 - Electrically Driven Chucking System for Machine Tool - Google Patents

Electrically Driven Chucking System for Machine Tool Download PDF

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Publication number
KR101841185B1
KR101841185B1 KR1020160006509A KR20160006509A KR101841185B1 KR 101841185 B1 KR101841185 B1 KR 101841185B1 KR 1020160006509 A KR1020160006509 A KR 1020160006509A KR 20160006509 A KR20160006509 A KR 20160006509A KR 101841185 B1 KR101841185 B1 KR 101841185B1
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KR
South Korea
Prior art keywords
spindle
driving member
housing
clutch
driving
Prior art date
Application number
KR1020160006509A
Other languages
Korean (ko)
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KR20170086906A (en
Inventor
장정환
윤용선
Original Assignee
동아대학교 산학협력단
칸워크홀딩 주식회사
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Application filed by 동아대학교 산학협력단, 칸워크홀딩 주식회사 filed Critical 동아대학교 산학협력단
Priority to KR1020160006509A priority Critical patent/KR101841185B1/en
Priority to EP16886591.3A priority patent/EP3406397B1/en
Priority to PCT/KR2016/005272 priority patent/WO2017126748A1/en
Priority to CN201680079193.1A priority patent/CN108698179B/en
Publication of KR20170086906A publication Critical patent/KR20170086906A/en
Application granted granted Critical
Publication of KR101841185B1 publication Critical patent/KR101841185B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/70—Stationary or movable members for carrying working-spindles for attachment of tools or work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/02—Driving main working members
    • B23Q5/04—Driving main working members rotary shafts, e.g. working-spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/02—Driving main working members
    • B23Q5/04—Driving main working members rotary shafts, e.g. working-spindles
    • B23Q5/043—Accessories for spindle drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/02—Driving main working members
    • B23Q5/04—Driving main working members rotary shafts, e.g. working-spindles
    • B23Q5/10—Driving main working members rotary shafts, e.g. working-spindles driven essentially by electrical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/54—Arrangements or details not restricted to group B23Q5/02 or group B23Q5/22 respectively, e.g. control handles

Abstract

The present invention relates to an electric drive chucking system of a machine tool capable of selectively transmitting power of a motor for driving a spindle to a drawbar and a spindle for driving the chuck using a clutch mechanism in a lathe for machining a workpiece, An electric drive chucking system according to one aspect of the present invention includes: a housing fixedly installed to a main body of a machine tool; A spindle in the form of a hollow tube provided inside the housing so as to be rotatable with respect to the housing; A driving member disposed outside the rear portion of the spindle so as to be rotatable relative to the spindle; A motor for rotating the driving member; A female screw cover having one side fixed to the driving member and a female screw mountain formed at a central portion thereof; Wherein the spindle is provided with a drawbar formed on an outer circumferential surface thereof, wherein a male thread is spirally engaged with the female thread at a rear end of the spindle; A clutch coupler provided on an outer surface of the spindle so as to be linearly movable in an axial direction with respect to the spindle and coupled to the driving member along the moving direction or selectively coupling the spindle to either the driving member or the housing, ; And a clutch drive unit reciprocating the clutch coupler in the axial direction of the spindle.

Description

TECHNICAL FIELD [0001] The present invention relates to an electric drive chucking system for a machine tool,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a machine tool, and more particularly, to a machine tool capable of selectively transmitting power of a motor for driving a spindle to a drawbar and a spindle for driving a chuck using a clutch mechanism To an electric drive chucking system.

Generally, a machine tool is composed of a workpiece and a machining tool, and when one of them is fixed, the other machine rotates the shape of the workpiece, which can be divided into a lathe and a milling machine according to the rotating part.

The lathe is configured in such a manner that the workpiece is rotated while the processing tool is in a stopped state. The lathe includes a chuck for fixing the workpiece, a drawbar for driving the chuck, a drawbar and a chuck, a spindle for rotating the workpiece Consists of.

Conventional lathes require separate independent drive systems to drive the drawbars and spindles, primarily drawbars being hydraulic systems and spindles being electrical systems. The conventional drawbar which is operated hydraulically is complicated in installation and has a problem that the chuck can not control the force for holding the workpiece, and the efficiency is low. Efforts have been made to replace hydraulic systems with electrical systems to address them (US Patent 4,573,379, etc.).

Nevertheless, the drawbar and spindle still require independent electric driving systems, which complicates the structure of the entire lathe system and increases the size and cost of the electric motor due to the need to install the motors for driving the electric system.

US registered patent US 4,573,379 (registered March 4, 1986) Korean Registered Patent No. 10-0732596 (registered on June 20, 2007) Korean Utility Model Registration No. 20-0243368 (registered on August 7, 2001)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a chuck mechanism that selectively uses a clutch mechanism to selectively transmit power of a motor to a drawbar and a spindle for driving a chuck, And to provide an electrical drive chucking system of a machine tool as far as possible.

According to an aspect of the present invention, there is provided an electric drive chucking system including: a housing fixedly installed on a main body of a machine tool; A spindle in the form of a hollow tube provided inside the housing so as to be rotatable with respect to the housing; A driving member disposed outside the rear portion of the spindle so as to be rotatable relative to the spindle; A motor for rotating the driving member; A female screw cover having one side fixed to the driving member and a female screw mountain formed at a central portion thereof; Wherein the spindle is provided with a drawbar formed on an outer circumferential surface thereof, wherein a male thread is spirally engaged with the female thread at a rear end of the spindle; A clutch coupler provided on an outer surface of the spindle so as to be linearly movable in an axial direction with respect to the spindle and coupled to the driving member along the moving direction or selectively coupling the spindle to either the driving member or the housing, ; And a clutch drive unit reciprocating the clutch coupler in the axial direction of the spindle.

According to an aspect of the present invention, there is provided an electric drive chucking system for a machine tool, comprising: a housing fixedly installed on a main body of a machine tool; A spindle in the form of a hollow tube provided inside the housing so as to be rotatable with respect to the housing; A driving member rotatably installed outside the rear portion of the spindle; A motor for rotating the driving member; A drive shaft rotatably installed on the spindle inside the spindle and having a rear end fixed to the driving member and rotated together with the driving member and having a first screw thread formed at a front end thereof in a spiral shape; A spline key fixed to a front portion of the spindle and having a spline groove formed in the axial direction of the spindle; A second screw thread formed on the rear portion of the first screw thread and coupled to the spline groove of the spline key at a front portion thereof to form spline concave and convex portions that move axially along the spline groove; A drawbar fixedly installed on the motion converting shaft; A clutch coupler provided on an outer surface of the spindle so as to be linearly movable in an axial direction with respect to the spindle and coupled to the driving member along the moving direction or selectively coupling the spindle to either the driving member or the housing, ; And a clutch driving part for reciprocating the clutch coupler in the axial direction of the spindle.

According to the present invention, it is possible to process the workpiece by selectively generating the axial movement of the drawbar (50) and the rotational movement of the spindle (20) with a single motor, so that the structure of the drive device is simplified, Can be reduced.

1 is a side view of an electrically actuated chucking system according to a first embodiment of the present invention.
2 is an exploded perspective view of the electric drive chucking system shown in FIG.
Figures 3 and 4 are cross-sectional views of the electrical drive chucking system shown in Figure 1;
FIG. 5 is an exploded perspective view showing an essential part of the electric drive chucking system shown in FIG.
6 is an exploded perspective view of an electrically driven chucking system according to a second embodiment of the present invention.
7 and 8 are cross-sectional views of the electric drive chucking system shown in Fig.
Fig. 9 is an exploded perspective view of the main part of the electric drive chucking system shown in Fig. 6 cut away. Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electric drive chucking system of a machine tool according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 5, an electric drive chucking system according to a first embodiment of the present invention includes a housing 10, a spindle 20 in the form of a hollow tube provided inside the housing 10 so as to be rotatable with respect to the housing A driving member 30 provided outside the rear portion of the spindle 20 to be rotatable relative to the spindle 20; a motor (not shown) for rotating the driving member 30; A female screw cover 40 fixed to the driving member 30, a motion converting adapter 55 in the form of a circular tube coupled to the center of the female screw cover 40, A draw bar 50 coupled to the spindle 20 so as to linearly move axially with respect to the spindle 20 from the inside of the spindle 20; A clutch coupler 60 installed to the clutch coupler 60, And reciprocates in the axial direction of the pins (20).

The housing (10) has an internal hollow shape and is fixed to the main body of the machine tool. In this embodiment, the housing 10 has a tubular housing main body 11 formed with a front and a rear face open to be opened, and a housing main body 11 coupled to the front surface of the housing main body 11, A front cover 12 having a disk-shaped opening formed therein and an opening for receiving a rear portion of the spindle 20 at a central portion of the front cover 12 and coupled to a rear surface of the housing main body 11, And a disk-shaped rear cover 13 on which a second locking concavity 14 for connection with the coupler 60 is formed.

A chuck C for machining a workpiece is provided on the outer side of the front portion of the front cover 12 of the housing 10 and a jaw J for gripping the workpiece is formed on the chuck C And is movable in the radial direction. The jaw J is connected to the front end portion of the draw bar 50 through a connecting member (not shown) and moves in the radial direction by the forward and backward linear motion of the draw bar 50 to grasp or release the workpiece .

The spindle 20 has an elongated cylindrical shape and is rotatably installed in an inner space of the housing 10. A plurality of spindle bearings 25 are provided between the outer surface of the spindle 20 and the inner surface of the housing 10 to rotatably support the spindle 20 with respect to the housing 10.

Clutch spline grooves 21 are arranged at regular intervals along the circumferential direction on the outer peripheral surface of the rear portion of the spindle 20 in order to allow axial movement of the clutch coupler 60 and disallow relative rotation. A plurality of spline grooves 22 are formed on the inner circumferential surface of the rear end portion of the spindle 20 so as to extend in the axial direction so that the motion converting adapter 55 can move in the axial direction and prevent relative rotation. The spline grooves 22 are arranged at regular intervals along the circumferential direction on the inner circumferential surface of the rear end of the spindle 20.

The driving member 30 is rotatably installed along the outer surface of the spindle 20 at the rear end of the spindle 20. [ The driving member 30 is a pulley connected to the motor (not shown) through a power transmitting member such as a belt (not shown) or a gear, and receives power from the motor to rotate. A pulley bearing 35 for rotatably supporting the driving member 30 with respect to the spindle 20 is provided between the inner surface of the driving member 30 and the outer surface of the spindle 20. [

On the front surface of the driving member 30, there is formed a first locking unevenness 32 in the form of a gear for connection with the clutch coupler 60.

The female screw cover 40 is formed in a disc shape having a central hole formed with a hole to be coupled therethrough while the motion converting adapter 55 is passed through the center of the female screw cover 40. The front face of the female screw cover 40 is fixedly coupled to the driving member 30, Rotate together. A female screw thread 41 is formed on the inner circumferential surface of the hole formed at the center of the female screw cover 40 in a spiral shape.

The motion converting adapter 55 is formed in the shape of a circular tube having an outer circumferential surface formed with a male thread 56 spirally engaged with the female thread 41 so as to be linearly movable in the front and rear direction at the center of the female screw cover 40 Lt; / RTI > Spline protrusions 57 sliding along the spline grooves 22 formed on the inner circumferential surface of the spindle 20 are formed in the front portion of the outer circumferential surface of the motion converting adapter 55, But can only move in the axial direction. Therefore, when the female screw cover 40 is rotated by the rotation of the driving member 30, the motion converting adapter 55 is rotated by the operation of the female screw 41 and the male screw thread 56 to rotate the female screw cover 40 and the spindle 20 in the forward and backward direction.

The rear end of the drawbar 50 is fitted and fixed to the front end of the motion converting adapter 55 and linearly moves in the back and forth direction inside the spindle 20 together with the motion converting adapter 55. The drawbar 50 and the motion converting adapter 55 may be formed as an individual body and then coupled to each other. Alternatively, the drawbar 50 and the motion converting adapter 55 may be integrally formed.

The clutch coupler 60 is installed to slide axially with respect to the spindle 20 between the front portion of the driving member 30 and the rear portion of the housing 10 so that the driving member 30 Or coupled with the housing 10 to selectively connect the spindle 20 to either the driving member 30 or the housing 10. [

In this embodiment, the clutch coupler 60 is formed in the shape of a ring having a circular hole through which the spindle 20 passes. The inner circumferential surface of the clutch coupler 60 has a clutch spline groove 21 on the outer peripheral surface of the spindle 20, And the first coupling concave and convex portions 61 are formed on the rear portion of the first coupling concave and convex portion 32 so as to engage with the first locking concave and convex portions 32 of the driving member 30. [ A second coupling protrusion 63 is formed on the front portion of the housing 10 so as to engage with the second locking protrusion 14 of the housing 10.

Although not shown in the drawing, a clutch driving unit (not shown) for operating the clutch coupler 60 applies an axial force to the clutch coupler 60 as power is applied from the outside, thereby moving the clutch coupler 60 in the axial direction Such as a pneumatic cylinder or a hydraulic cylinder that operates according to the application of pneumatic or hydraulic pressure, or a linear motor that generates linear motion by an electric force.

As described above, in addition to the clutch drive mechanism (not shown) that applies a force to the clutch coupler 60 in both directions to forward and reverse the clutch coupler 60, the clutch coupler 60 also includes an elastic body The clutch drive unit (not shown) applies a force to the clutch coupler 60 in one direction to move the clutch coupler 60 forward or backward. Then, when the external force by the clutch drive unit is removed, by the elastic force of the elastic body The clutch coupler 60 may be caused to linearly move in the other direction.

Next, a driving method of the electric driving chucking system according to the first embodiment will be described in detail with reference to FIGS. 3 and 4. FIG.

3, when the power is applied to the clutch driving unit (not shown) or when the pneumatic pressure is applied and the clutch is turned on, the clutch coupler 60 is moved forward from the rear of the spindle 20 The second coupling protrusions 63 on the front face of the clutch coupler 60 are engaged with the second locking protrusions 14 on the rear face of the rear cover 13. [ Thus, the spindle 20 is engaged with the housing 10 and rotation is restricted.

In this state, when the motor (not shown) is operated, the driving member 30 receives the power from the motor and rotates, and the female screw cover 40 rotates together with the driving member 30. At this time, the male thread 56 of the motion converting adapter 55 is helically engaged with the female screw cover 40, and the motion converting adapter 55 is rotated by the action of the spline concave / convex 57 and the spline groove 22, The motion converting adapter 55 and the drawbar 50 fixed thereto are moved backward in the axial direction (linear movement in the left direction in the figure).

As the draw bar 50 linearly moves rearward with respect to the spindle 20, the jaw J provided on the chuck C is tightened and the workpiece is firmly gripped. Of course, after the machining of the workpiece is finished, the driving member 30 rotates in the opposite direction by the motor to advance the motion converting adapter 55 and the drawbar 50 in the axial direction, Let the workpiece fall.

On the other hand, when power is applied to the clutch driving unit (not shown) or the pneumatic pressure is applied and the clutch is turned off (off) in a state where the drawbar 50 is backward and the jaw J is firmly gripping the workpiece , The clutch coupler 60 moves rearward (leftward in the figure) from the front of the spindle 20 so that the first coupling protrusions 62 on the rear side of the clutch coupler 60 move to the rear side (32) on the front surface of the first locking protrusion (30). Thus, the spindle 20 is connected to the driving member 30 via the clutch coupler 60 and is allowed to rotate.

In this state, when the power of the motor is transmitted to the driving member 30 and the driving member 30 is rotated, the workpiece is machined while the drawbar 50 rotates with the spindle 20 at a high speed.

As described above, according to the present invention, it is possible to process the workpiece by selectively generating the axial movement of the drawbar 50 and the rotational movement of the spindle 20 with a single motor, so that the structure of the drive device is simplified, There is an advantage of reducing the overall size.

Since the electric drive chucking system of the present invention does not generate a relative speed between the draw bar 50 and the spindle 20, the draw bar 50 can not advance due to the centrifugal force during the rotation of the spindle 20, The weakening phenomenon does not occur. In other words, when the workpiece is machined while rotating the spindle 20 and the drawbar 50 at a high speed, the centrifugal force generated in the chuck causes the jaw J of the chuck to spread to reduce the clamping force. The chucking system is constructed such that the drawbar 50 connected to the jaw J is connected to the spindle 20 in a splined structure and the male thread 56 of the motion converting adapter 55 is connected to the female thread of the female screw cover 40 41 so that the drawbar 50 is structurally locked so that it can not be pushed rightward (forward) in the drawing by centrifugal force. Therefore, the drawbar 50 is structurally locked, so that it is possible to provide a stable clamping force without jogging even at high speed rotation.

6 through 9 illustrate an electric drive chucking system according to a second embodiment of the present invention. The electric drive chucking system includes a housing 110, a spindle 120 in the form of a hollow tube rotatably installed in the housing 110, A driving member 130 installed outside the rear portion of the spindle 120 so as to be rotatable relative to the spindle 120 and a driving shaft 130 rotatably installed on the inner side of the spindle 120, A spline key 180 fixed to a front portion of the spindle 20 and having a spline groove 181 formed in the axial direction of the spindle and a spline key 180 A motion conversion shaft 170 coupled to the spline groove 181 and having spline protrusions 172 that move in the axial direction along the spline groove 181 and a drawbar fixedly installed at the center of the motion conversion shaft 170 And a spindle (120) mounted on the outer surface of the spindle (120) A clutch coupler 160 installed to be linearly movable in the direction of the axis of the shaft and a clutch driving part for reciprocating the clutch coupler 160 in the axial direction of the spindle 120.

The housing 110 has a tubular housing body 111 formed with open front and rear faces to be fixed to the machine tool body, and a housing body 111 coupled to the rear face of the housing body 111. [ And a disc-shaped rear cover 113 having an opening through which a rear portion of the spindle 120 passes, and a second locking protrusion 114 for connection with the clutch coupler 160, do.

The spindle 120 has an elongated cylindrical shape and is rotatably installed in an inner space of the housing 110. A plurality of spindle bearings 125 are installed between the outer surface of the spindle 120 and the inner surface of the housing 110 to rotatably support the spindle 120 with respect to the housing 110.

The outer peripheral surface of the rear end portion of the spindle 120 is formed with a clutch spline groove 121 in the form of a gear to allow axial movement of the clutch coupler 160 and not allow relative rotation.

The driving member 130 is rotatably installed outside the rear end of the spindle 120. The driving member 130 is a pulley connected to the motor (not shown) through a power transmitting member such as a belt (not shown) or a gear, and receives power from the motor to rotate. The center of the driving member 130 is fixedly coupled to the rear end of the driving shaft 140. When the driving member 130 rotates, the driving shaft 140 rotates together.

On the front surface of the driving member 130, first locking irregularities 132 in the form of gears for connection with the clutch coupler 160 are formed.

The driving shaft 140 has an elongated cylindrical shape, and a rear end thereof is fixed to a center portion of the driving member 130. The drive shaft 140 is installed inside the spindle 120 so as to be rotatable with respect to the spindle 120. Between the outer surface of the drive shaft 140 and the inner surface of the spindle 120 is provided a plurality of shaft bearings 142 for rotatably supporting the drive shaft 140 with respect to the spindle 120.

On the inner circumferential surface of the front end of the drive shaft 140, a first screw thread 141, which is a female screw thread, is formed in a spiral shape.

The motion converting shaft 170 is inserted into the front end of the driving shaft 140 and is linearly moved in the axial direction with respect to the driving shaft 140. On the outer circumferential surface of the rear portion of the driving converting shaft 170, A second screw thread 171 which is a male screw thread coupled to the spline groove 180 is formed on the front side of the spline shaft 180 and is coupled to the spline groove 181 of the spline key 180 on the front side thereof and moves in the axial direction along the spline groove 181 Spline protrusions 172 are formed. Accordingly, when the driving shaft 140 rotates, the motion converting shaft 170 is rotated by the action of the first thread 141 and the second thread 171, the spline groove 181 and the spline concave / Direction.

The drawbar 150 is coupled to the center of the motion converting shaft 170 in front of the motion converting shaft 170. The drawbar 150 is connected to the jaw J of the chuck C through a connecting member such as the drawbar 150 of the first embodiment described above so that when the drawbar 150 is moved backward, J moves radially inward to grasp the workpiece, and when the drawbar 150 advances, the jaw J moves radially outward to place the workpiece.

The spline key 180 has a cylindrical shape and is fixed to the inside of the front end of the spindle 120. The spline key 180 has a spline groove connected to the spline protrusion 172 of the motion conversion shaft 170 181 are formed so that the linear motion is connected as much as possible even though the motion converting axis 170 is not rotatable with respect to the spline key 180. [

Referring to FIGS. 7 and 8, the driving method of the electric driving chucking system according to the second embodiment of the present invention will be described in detail.

Referring to FIG. 7, when the power is applied to the clutch driving unit (not shown) or when the pneumatic pressure is applied and the clutch is turned on, the clutch coupler 160 moves forward from the rear of the spindle 120 The second coupling protrusions 163 on the front face of the clutch coupler 160 are engaged with the second locking protrusions 114 on the rear side of the rear cover 113. [ Accordingly, the spindle 120 is coupled to the housing 110 and rotation is restricted.

In this state, when the motor (not shown) is operated, the driving member 130 receives the power from the motor and rotates, and the driving shaft 140 rotates together with the driving member 130. At this time, the first screw thread 141 of the drive shaft 140 is coupled to the second screw thread 171 of the motion converting shaft 170, and the motion converting shaft 170 is not rotated by the spline key 180 The motion converting shaft 170 and the draw bar 150 fixed thereto are moved backward in the axial direction (linear movement in the left direction in the figure).

As the drawbar 150 linearly moves rearward relative to the spindle 120, the chuck C is pinched and the workpiece is firmly gripped.

When power is applied to the clutch driving unit (not shown) or the pneumatic pressure is applied and the clutch is turned off in the state where the drawbar 150 is retracted and the chuck C grasps the workpiece firmly, The clutch coupler 160 moves from the front to the rear of the spindle 120 (to the left in the drawing) so that the first coupling protrusions 162 on the rear side of the clutch coupler 160 move to the driving member 130, Is engaged with the first locking concavity (132) on the front surface. Accordingly, the spindle 120 is connected to the driving member 130 via the clutch coupler 160 and can rotate.

In this state, when the power of the motor is transmitted to the driving member 130 and the driving member 130 rotates, the driving shaft 140, the motion converting shaft 170, and the drawbar 150 together with the spindle 120 rotate at a high speed So that the workpiece is machined.

In the second embodiment, a clutch driving unit (not shown) for operating the clutch coupler 160 applies a force to the clutch coupler 160 in the axial direction as power is applied from the outside, thereby moving the clutch coupler 160 in the axial direction Such as a pneumatic cylinder or a hydraulic cylinder that operates according to the application of pneumatic or hydraulic pressure, or a linear motor that generates linear motion by an electric force.

Also in this case, in addition to a method in which the clutch coupler 160 is biased in the axial direction with respect to the spindle 120 by applying a bi-directional force to the clutch coupler 160 as a clutch driving unit (not shown) (Not shown) that applies an elastic force to the clutch coupler 160. The clutch drive unit (not shown) applies force to the clutch coupler 160 in one direction to move the clutch coupler 160 forward or backward. Then, The clutch coupler 160 may be moved linearly in the other direction due to the elastic force of the elastic body.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the appended claims. And it is to be understood that such modified embodiments belong to the scope of protection of the present invention defined by the appended claims.

C: Chuck J: Jaw
10: Housing 13: Rear cover
14: Second locking unevenness 20: Spindle
21: clutch spline groove 22: spline groove
25: spindle bearing 30: drive member
32: First locking unevenness 40: Female thread cover
41: female thread 50: drawbar
55: motion converting adapter 56: male threads
57: spline protrusion 60: clutch coupler
61: clutch unevenness 62: first coupling unevenness
63: second coupling concavo-convex 110: housing
114: second locking concave and convex 120: spindle
121: clutch spline groove 125: spindle bearing
130: driving member 132: first locking concave / convex
140: drive shaft 141: first thread
150: Drawbar 160: Clutch coupler
161: clutch unevenness 162: first coupling unevenness
163: second coupling concavo-convex 170: motion conversion axis
171: Male thread 172: Spline concave and convex
180: Spline key 181: Spline groove

Claims (9)

delete delete delete delete delete A housing (110) fixedly mounted on a main body of the machine tool;
A spindle 120 in the form of a hollow tube provided rotatably with respect to the housing inside the housing 110;
A driving member 130 rotatably installed outside the rear portion of the spindle 120;
A motor for rotating the driving member 130;
A rear end portion is fixed to the driving member 130 and rotates together with the driving member 130 and a first thread 141 is provided at a front end portion of the spindle 120, A driving shaft 140 formed in a spiral shape;
A spline key 180 fixed to a front portion of the spindle 120 in front of the driving shaft 140 and having a spline groove 181 formed in the axial direction of the spindle;
A second screw thread 171 is formed on the rear portion of the first screw thread 141 and is coupled to the spline groove 181 of the spline key 180 on the front portion thereof, A motion conversion shaft 170 having spline protrusions 172 that are moved in the direction of the axis of rotation;
A draw bar 150 fixedly installed in front of the motion converting shaft 170;
The spindle 120 is installed on the outer surface of the spindle 120 so as to linearly move in the axial direction with respect to the spindle 120. The spindle 120 is coupled with the driving member 130 or coupled with the housing 110, A clutch coupler (160) selectively connecting to either the driving member (130) or the housing (110);
A clutch driving part for reciprocating the clutch coupler 160 in the axial direction of the spindle 120;
Lt; / RTI >
The first screw thread 141 of the drive shaft 140 is a female thread formed on the inner circumferential surface of the front end of the drive shaft 140. The second screw thread 171 of the motion conversion shaft 170 is a screw thread, And a male thread formed on the outer surface of the rear portion. The clutch coupler (160) according to claim 6, wherein the clutch coupler (160) has a clutch gear unevenness (161) in the form of a gear which is meshed with the clutch spline groove (121) in the form of a gear formed on the outer peripheral surface of the spindle A first coupling unevenness 162 in the form of a gear for coupling with the driving member 130 is formed in the rear portion of the first coupling protrusion 162 and a second coupling protrusion 162 is formed in the front portion of the second coupling protrusion 162 in the form of a gear for coupling with the housing 110 A ring shape in which coupling unevenness 163 is formed;
The driving member 130 is formed with a first locking concavity 132 in the form of a gear engaging with the first coupling concavity 162;
And a second locking concavity (114) in the form of a gear engaging with the second coupling concavity (163) is formed in the housing (110). delete The clutch coupler (160) according to claim 6, further comprising an elastic body for applying an elastic force to the clutch coupler (160) in the axial direction of the spindle (120) Is coupled to the driving member (130) or the housing (110) by sliding in the axial direction with respect to the spindle (20) by the elastic force of the elastic body.
KR1020160006509A 2016-01-19 2016-01-19 Electrically Driven Chucking System for Machine Tool KR101841185B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1020160006509A KR101841185B1 (en) 2016-01-19 2016-01-19 Electrically Driven Chucking System for Machine Tool
EP16886591.3A EP3406397B1 (en) 2016-01-19 2016-05-18 Electric driven chucking system comprising automatic clutch system
PCT/KR2016/005272 WO2017126748A1 (en) 2016-01-19 2016-05-18 Electric driven chucking system comprising automatic clutch system
CN201680079193.1A CN108698179B (en) 2016-01-19 2016-05-18 Electrically driven chucking system including an automatic clutch system

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KR1020160006509A KR101841185B1 (en) 2016-01-19 2016-01-19 Electrically Driven Chucking System for Machine Tool

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KR101999324B1 (en) * 2018-02-01 2019-07-12 칸워크홀딩 주식회사 Electrical Driving System for Machine Tools, And Method for Operating the Same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002043906A1 (en) * 2000-11-28 2002-06-06 Pratt Burnerd International Limited Actuator for workpiece holding device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002043906A1 (en) * 2000-11-28 2002-06-06 Pratt Burnerd International Limited Actuator for workpiece holding device

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