KR101639688B1 - Electric Driving System for Machine And Driving Method Thereof - Google Patents

Electric Driving System for Machine And Driving Method Thereof Download PDF

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Publication number
KR101639688B1
KR101639688B1 KR1020140180369A KR20140180369A KR101639688B1 KR 101639688 B1 KR101639688 B1 KR 101639688B1 KR 1020140180369 A KR1020140180369 A KR 1020140180369A KR 20140180369 A KR20140180369 A KR 20140180369A KR 101639688 B1 KR101639688 B1 KR 101639688B1
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KR
South Korea
Prior art keywords
spindle
cylinder
drive shaft
drawbar
clutch
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KR1020140180369A
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Korean (ko)
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KR20160072569A (en
Inventor
장정환
장대규
Original Assignee
동아대학교 산학협력단
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Priority to KR1020140180369A priority Critical patent/KR101639688B1/en
Priority to PCT/KR2015/013736 priority patent/WO2016099119A1/en
Publication of KR20160072569A publication Critical patent/KR20160072569A/en
Application granted granted Critical
Publication of KR101639688B1 publication Critical patent/KR101639688B1/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
    • 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
    • B23Q5/54—Arrangements or details not restricted to group B23Q5/02 or group B23Q5/22 respectively, e.g. control handles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Gripping On Spindles (AREA)

Abstract

The present invention relates to an electric driving apparatus and method for a machine tool capable of working a lathe using one electric driving unit by selectively transmitting power of a motor to a cylinder and a spindle using a clutch and a reduction gear unit, The electric driving apparatus of the machine tool includes a fixed portion 10 fixed to the main body of the machine tool, a driving shaft 20 connected to the motor (not shown) and receiving a rotational force, A reduction gear unit disposed inside the spindle 30 and composed of a sun gear 41, a planetary gear 42, a ring gear 43, and a carrier 44; A cylinder 50 fixed to the center of the carrier 44 of the reduction gear unit and a drawbar 60 accommodated in the cylinder 50 so as to linearly move in the axial direction by rotation of the cylinder 50 The spindle 30, A clutch coupler 70 slidably installed at the rear of the spindle 30 in the axial direction so as to selectively connect the spindle 30 to either the drive shaft 20 or the fixed portion 10, (70) reciprocating in the axial direction of the spindle (30).

Description

Technical Field [0001] The present invention relates to an electric driving apparatus for a machine tool,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electric driving apparatus for a machine tool, and more particularly, to an electric driving apparatus for a machine tool that can selectively transmit power of a motor to a cylinder and a spindle for driving the chuck using a clutch and a reduction gear unit And more particularly, to an apparatus and method for electrically driving a machine tool.

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 rotates while the processing tool is stationary, typically comprising a chuck for fixing the workpiece, a cylinder for driving the chuck, a cylinder and a chuck, and a spindle for rotating the workpiece .

Conventional lathes require separate independent drive systems to drive cylinders and spindles, mainly cylinders being hydraulic systems and spindles being electrical systems. Conventional hydraulically actuated cylinders are complicated to install, have 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, since the cylinders and the spindles still require separate electric drive systems, the overall shelf system is complicated and the size and cost of the motor increase due to the need to install 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 problems, and it is an object of the present invention to provide a machine and a spindle capable of selectively operating a motor and a spindle using a clutch and a reduction gear unit, And to provide an electric driving apparatus and method of the machine.

According to an aspect of the present invention, there is provided an electric drive apparatus for a machine tool, including: a fixed unit fixedly installed on a main body of a machine tool; A drive shaft connected to the motor to receive a rotational force; A tubular spindle rotatably installed on the fixed portion; A reduction gear unit coupled to the drive shaft at the inner side of the spindle so as to be able to decelerate and transmit the rotational force of the drive shaft; A cylinder fixedly installed at the center of the reduction gear unit and receiving a rotational force from the reduction gear unit and having an internal thread formed on an inner peripheral surface thereof; A drawbar which is formed on an outer circumferential surface of the cylinder so as to be spirally coupled with the female screw thread of the cylinder and is accommodated inside the cylinder and is connected to the spindle in a linear motion but axially relative to the spindle, A clutch coupler slidably installed on a rear portion of the spindle along an axial direction of the spindle to selectively connect the spindle to either the drive shaft or the fixed portion; And a clutch driving part for reciprocating the clutch coupler in the axial direction of the spindle.

According to another aspect of the present invention, there is provided an electrical driving method for a machine tool using an electric driving apparatus, the method comprising: moving the clutch coupler in one direction so that the clutch coupler couples the spindle and the fixed unit; Rotating the driving shaft by rotating the sun gear, the planetary gear and the carrier by rotating the driving shaft by receiving power from the motor; Moving the drawbar backward by a predetermined distance in the axial direction by rotation of the cylinder; The clutch drive moves the clutch coupler in a direction opposite to the previous direction so that the clutch coupler couples the spindle and the drive shaft; And rotating the spindle and the drawbar to machine the workpiece while the drive shaft receives power from the motor and rotates to rotate the spindle and the drawbar.

According to the present invention, since the cylinder and the spindle can be driven by using one motor, the structure of the driving apparatus can be simplified and the overall size can be reduced.

In addition, not only the axial movement distance of the drawbar can be finely adjusted by rotation of the cylinder, but also precise control of the clamping force is facilitated.

And, since the motor always operates at the highest efficiency point, the efficiency of the system can be improved.

In addition, because the relative speed between the draw bar and the cylinder does not occur, the draw bar can not advance due to the centrifugal force during the rotation of the spindle due to the structural locking function, so that the clamping force is not weakened and the initial clamping force can be maintained regardless of the centrifugal force There is also an effect.

1 is an exploded perspective view showing an electric drive apparatus of a machine tool according to an embodiment of the present invention.
2 is a cross-sectional view of the electric drive device of Fig.
3 is a front view showing the reduction gear unit of the electric drive system of FIG.
4 is an exploded perspective view showing a spindle and a drawbar of the electric driving device of FIG.
Fig. 5 is an exploded perspective view showing a cylinder and a drawbar of the electric driving device of Fig. 1;
6 to 8 are perspective views showing the construction and operation of the clutch coupler of the electric drive apparatus of FIG.
Fig. 9 is a cross-sectional view showing the clutch-on state of the electric drive apparatus of Fig. 1;
10 is a cross-sectional view showing the clutch off state of the electric drive apparatus of FIG.
FIG. 11 is a cross-sectional view of an electric drive apparatus for a machine tool according to another embodiment of the present invention, which is an enlarged view of a cylinder and a drawbar.
12 is a front view of a reduction gear unit of an electric drive apparatus for a machine tool according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of an apparatus and method for driving a machine tool according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 10 are views showing an electric drive apparatus for a machine tool according to an embodiment of the present invention.

1 and 2, an electric driving apparatus for a machine tool according to the present invention includes a fixed unit 10 fixedly installed on a main body of a machine tool, a motor 10 connected to a motor (not shown) A spindle 30 rotatably installed in the fixed portion 10; a reduction gear unit disposed inside the spindle 30; and a carrier 44, A draw bar 60 accommodated in the cylinder 50 so as to be linearly moved in the axial direction by rotation of the cylinder 50 and a draw bar 60 provided in the rear of the spindle 30, A clutch coupler 70 slidably installed along the axial direction of the spindle 30 to selectively connect the spindle 30 to either the drive shaft 20 or the fixed portion 10; 70) reciprocating in the axial direction of the spindle (30) Time).

2 and 3, the reduction gear unit is constructed using a planetary gear set. The sun gear 41 is coupled to the drive shaft 20 and rotates inside the spindle 30, A ring gear 43 fixed to the inner surface of the spindle 30 and a sun gear 41 fixed to the sun gear 41 and the ring gear 43 between the sun gear 41 and the ring gear 43, A plurality of planetary gears 42 that are rotated in the circumferential direction of the ring gear 43 to receive rotational force of the planetary gears 42 and rotate in one direction together with the planetary gears 42, And a carrier 44.

The fixing part 10 has a cylindrical shape in which a rear end portion and a front end portion are opened and is fixed to a machine tool body (not shown) such as a lathe machine. The second coupling portion 11 is formed at the rear end portion of the fixing portion 10 so as to be engaged with the second coupling portion 72 formed on the clutch coupler 70.

The drive shaft 20 is directly connected to a motor (not shown) or indirectly connected through a power transmission mechanism to receive power of the motor and rotate. The first coupling portion 21 is formed on the outer periphery of the drive shaft 20 to engage with and engage with the first coupling portion 71 formed on the clutch coupler 70. The front portion of the drive shaft 20 is installed to pass through the opening formed in the rear portion of the fixed portion 10 and the spindle 30 and the sun gear 41 of the reduction gear unit is coupled to the front end portion of the drive shaft 20. Therefore, when the drive shaft 20 is rotated by the motor, the sun gear 41 rotates together with the drive shaft 20. [ In this embodiment, the drive shaft 20 is shown as a hollow hollow cylinder, but may alternatively be a hollow solid cylinder filled with hollow.

The spindle 30 has a hollow cylindrical shape and is coaxially arranged inside the fixed portion 10 and is configured to be rotatable with respect to the fixed portion 10. A plurality of bearings 33 for rotatably supporting the spindle 30 with respect to the fixed portion 10 are provided between the inner peripheral surface of the fixed portion 10 and the outer peripheral surface of the spindle 30. [ The sun gear 41, the planetary gear 42, the ring gear 43, the carrier 44, and the cylinder 50 constituting the reduction gear unit are installed in the spindle 30. A chuck housing 80, to which a chuck for fixing the workpiece is mounted, is coupled to the front end of the spindle 30.

The cylinder 50 has a hollow cylindrical shape and is disposed coaxially with the spindle 30. The rear end of the cylinder 50 is fixed to the center of the carrier 44 and rotates together with the carrier 44. On the inner circumferential surface of the cylinder 50, a female thread 51 is formed. Between the outer peripheral surface of the front end of the cylinder 50 and the inner peripheral surface of the front end of the spindle 30, a bearing 55 is provided for supporting the cylinder 50 relatively rotatably with respect to the spindle 30. [

4 and 5, the drawbar 60 has a hollow cylindrical shape and is installed to be received in the cylinder 50. The drawbar 60 is provided on the outer circumferential surface with a screw thread 51 of the cylinder 50, The male thread 61 is formed. The front end of the drawbar 60 extends outwardly through the front end of the spindle 30. The spindle 30 is connected to the spindle 30 so as to be capable of linear movement in the axial direction but not relative to the spindle 30 . At least one spline protrusion 32 protruding toward the drawbar 60 is formed at the front end of the spindle 30 and the spline protrusion 32 is inserted into the drawbar 60 The spline groove 62 is formed to extend along the axial direction of the draw bar 60 so that the draw bar 60 is moved in the axial direction with respect to the spindle 30 by the spline projection 32 and the spline groove 62 And the relative rotation is impossible. In this embodiment, the drawbar 60 is shown as a hollow hollow cylinder, but may alternatively consist of a hollow solid cylinder filled with hollow.

The clutch coupler 70 is slidably mounted on the rear portion of the spindle 30 along the axial direction of the spindle 30 so that the spindle 30 can be selectively inserted into either the drive shaft 20 or the fixed portion 10 As shown in FIG. 6 to 8, the clutch coupler 70 is in the form of a ring, and the rear portion thereof has a first coupling portion 71 in the form of a gear engaged with the first coupling portion 21 of the drive shaft 20 And a second coupling portion 72 in the form of a gear engaged with the second coupling portion 11 of the fixing portion 10 is formed at the front portion thereof.

A first serration portion 31 is formed on the outer peripheral surface of the rear end portion of the spindle 30 in the form of a gear. The inner surface of the clutch coupler 70 is engaged with the first serration portion 31, The second serration portion 73 of the gear shape is formed which permits relative movement in the axial direction with respect to the first serration portion 31 but does not allow relative rotation in the circumferential direction. When a force is applied to the clutch coupler 70 in the axial direction by a clutch driving unit (not shown), the second serration portion 73 of the clutch coupler 70 is engaged with the first serration portion 31 of the spindle 30 And the relative rotation of the clutch coupler 70 and the spindle 30 is limited by the coupling between the first and second serration portions 31 and 73. [

Although not shown in the drawing, the clutch driving unit may be a solenoid type driver that can move the clutch coupler 70 in the axial direction by exerting an axial force on the clutch coupler 70 when power is externally applied thereto, Such as a pneumatic cylinder that operates in accordance with the application of an electric power, or a linear motor that generates linear motion by an electric force.

Next, a driving method of the electric driving apparatus according to the embodiment will be described in detail with reference to FIGS. 9 and 10. FIG.

9, 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 70 is moved forward from the rear of the spindle 30 And is joined to the rear surface of the fixing portion 10. At this time, the second coupling portion 72 in front of the clutch coupler 70 is engaged with the second connection portion 11 of the fixed portion 10 so that the spindle 30 is engaged with the fixed portion 10, Is limited.

In this state, when the motor (not shown) is operated, the drive shaft 20 receives the power from the motor and rotates, and the sun gear 41 rotates. The ring gear 43 is in a fixed state and the planetary gear 42 receives the rotational force of the sun gear 41 and the outer peripheral surface of the ring gear 43 And is rotated.

As the planetary gear 42 rotates at a reduced speed, the carrier 44 coupled with the planetary gears 42 rotates, and the cylinder 50 rotates. At this time, the drawbar 60 has a male screw thread 61 formed on the outer circumferential surface thereof helically engaged with the female screw thread 51 of the cylinder 50, and can not rotate relative to the fixed spindle 30 The drawbar 60 is moved backward in the axial direction (linear movement in the left direction in the drawing) by the rotation of the cylinder 50. [

Although not shown in the drawing, the drawbar 60 is connected to a jaw of the chuck, and the jaw of the chuck is gripped by the backward movement of the drawbar 60, thereby gripping the workpiece.

When the cylinder 50 rotates and the drawbar 60 retracts while the spindle 30 is engaged with the fixed portion 10 by the clutch coupler 70 as described above, So that the clutch coupler 70 is moved backward.

The clutch coupler 70 moves rearward along the rear portion of the spindle 30 so that the first coupling portion 71 is engaged with the first connection portion 21 of the drive shaft 20 while being separated from the fixed portion 10, do.

In this state, when the motor is operated to rotate the drive shaft 20, the drive shaft 20 and the spindle 30 rotate together. The planetary gear 42 and the carrier 44 are directly connected to the ring gear 43 coupled to the spindle 30 and the sun gear 41 of the drive shaft 20 so that the sun gear 41 and the spindle 30 And is rotated at the same rotational speed at a high speed.

Therefore, as the drive shaft 20 rotates, the cylinder 50 connected to the carrier 44 and the drawbar 60 connected to the front end of the spindle 30 and the chuck housing 80 rotate together at 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 60 and the rotational movement of the spindle 30 with a single motor, There is an advantage that the overall size of the device can be reduced.

Further, since the relative speed between the draw bar 60 and the cylinder 50 is not generated, the draw bar 60 can not advance due to the centrifugal force during the rotation of the spindle 30, so that the clamping force is weakened There is no occurrence of the phenomenon. In other words, the centrifugal force generated in the jaw of the chuck when the workpiece is processed while rotating the spindle 30 and the drawbar bar 60 at a high speed causes a jaw to be opened to reduce the clamping force. The drawbar 60 connected to the jaw is connected to the spindle 30 in a splined manner and rotates only at the same speed as the ring gear 43 and the cylinder 50 is rotated by the carrier 44 And rotates only at the same speed as the carrier 44. At this time, since the carrier 44 rotates at the same speed because it is directly connected to the ring gear 43 through the planetary gear 42, the drawbar 60 can not be pushed rightward (forward) As shown in FIG. Therefore, the drawbar 60 is structurally locked so that the jaw of the chuck is not opened even at high speed rotation, and a stable clamping force can be provided.

The male thread 51 is formed on the inner circumferential surface of the cylinder 50 and the male thread 61 is formed on the outer circumferential surface of the draw bar 60 to be engaged with the female thread 51, 50 between the female threads 51 of the cylinders 50 and the male threads 61 of the draw bars 60. In this case, A recirculating ball 56 may be formed to allow the drawbar 60 to move more smoothly and smoothly in the axial direction by the rotation of the cylinder 50. [

In the above-described embodiment, the planetary gear set is used as the reduction gear unit, but a harmonic drive as shown in FIG. 12 may be used. 12, a reduction gear unit constructed using a harmonic drive includes an elliptical cam 142 which is coupled to the drive shaft 20 and rotates inside the spindle 30, A wave generator 141 composed of a ball bearing 143 fitted to the outer circumference of the spindle 142 and a ring gear 141 fixedly installed on the inner surface of the spindle 30, And a gear for engaging with the circular spline 144 is formed on an outer circumferential surface of the gear generator 141. A center portion of the gear 150 is engaged with the cylinder 50 And a flex spline 145 (flex. Spline).

When the cam 142 connected to the drive shaft 2 rotates in a state where the clutch coupler 70 moves forward from the rear of the spindle 30 and engages the spindle 30 and the fixed portion 10, The gear 145 is deformed into an elliptical shape by the rotation of the wave generator 141 to be engaged with the gears of the circular spline 144 in the long axis portion of the ellipse and the gear teeth are kept apart from each other in the short axis portion. When the wave generator 141 is rotated clockwise in the state where the circular spline 144 is fixed, the flex spline 145 is elastically deformed, and the position of the gear engaged with the circular spline 144 sequentially moves. When the wave generator 141 completes one full rotation, the flex spline 145 is rotated in the opposite direction by the difference in the number of teeth with respect to the circular spline 144, so that a decelerated rotational force can be obtained.

When the clutch coupler 70 is moved in the reverse direction and the drive shaft 20 rotates the spindle 30 in a state where the clutch coupler 70 binds the spindle 30 and the drive shaft 20, 144 and the flex spline 145 and the wave generator 141 are directly connected to each other and rotated together with the drive shaft 20 and the spindle 30 at a high speed.

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.

10: Fixing portion 11: Second connection portion
20: drive shaft 21: first connection portion
30: spindle 31: first serration part
32: spline projection 41: sun gear
42: planetary gear 43: ring gear
44: carrier 50: cylinder
51: female thread 60: drawbar
61: male threads 62: spline groove
70: clutch coupler 71: first coupling portion
72: second coupling portion 73: second serration portion
80: chuck housing cam 141: wave generator
142: cam 143: ball bearing
144: circular spline
145: Flex spline (flex. Spline)

Claims (9)

A fixing part (10) fixedly installed on the body of the machine tool;
A drive shaft (20) connected to the motor and receiving a rotational force;
A tubular spindle 30 rotatably installed in the fixing portion 10;
A reduction gear unit coupled to the drive shaft 20 from the inside of the spindle 30 so as to be able to decelerate and transmit the rotational force of the drive shaft 20;
A cylinder 50 fixedly installed at the center of the reduction gear unit and receiving a rotational force from the reduction gear unit and having a female thread 51 formed on an inner circumferential surface thereof;
A male thread 61 is formed on an outer circumferential surface of the cylinder 50 so as to be coupled to the female thread 51 of the cylinder 50 and is received in the cylinder 50, A drawbar (60) capable of movement but impossible to rotate in relative rotation;
A clutch coupler 70 which is slidably installed along the axial direction of the spindle 30 at a rear portion of the spindle 30 and selectively connects the spindle 30 to either the drive shaft 20 or the fixed portion 10; )Wow;
A clutch driving unit for reciprocating the clutch coupler (70) in the axial direction of the spindle (30);
/ RTI >
A first coupling portion 71 and a second coupling portion 72 are formed in a gear shape at the rear end and the front end of the clutch coupler 70,
The driving shaft 20 is formed with a first connecting portion 21 of a gear type which is engaged with the first coupling portion 71,
And a second connecting portion (11) in the form of a gear engaged with the second coupling portion (72) is formed at the rear end of the fixing portion (10). The reduction gear unit according to claim 1, wherein the reduction gear unit further comprises a sun gear (41) which is coupled to the drive shaft (20) and rotates inside the spindle (30) A gear 43 and a sun gear 41 and a ring gear 43 interposed between the sun gear 41 and the ring gear 43 so as to receive the rotational force of the sun gear 41, A plurality of planetary gears 42 connected to the plurality of planetary gears 42 and rotating together with the planetary gears 42 in one direction and having the cylinders 50 fixed to the center thereof 44). ≪ Desc / Clms Page number 19 > The reduction gear unit according to claim 1, wherein the reduction gear unit comprises an elliptical cam (142) coupled to the drive shaft (20) and rotating inside the spindle (30), and a ball bearing A circular spline 144 fixed to the inner surface of the spindle 30 and having a gear formed along the circumferential direction on the inner circumferential surface of the spindle 30; And a flexion spline 145 which is fitted to the outer surface of the wave generator 141 and has a gear teeth engaged with the circular spline 144 on its outer circumference and a central portion thereof is coupled with the cylinder 50 Wherein the harmonic drive is a harmonic drive. delete The clutch according to claim 1, wherein a first serration part (31) is formed on the outer peripheral surface of the rear end of the spindle (30), and the inner surface of the clutch coupler (70) Is formed with a second serration portion (73) of a gear type that permits relative movement in the axial direction with respect to the first serration portion (31) but does not permit relative rotation in the circumferential direction Electric drive of machines. The spindle according to claim 1, wherein at least one spline protrusion (32) protruding toward the drawbar (60) is formed at a front end of the spindle (30), and the spline protrusion The drawbar 60 is inserted into the spindle 30 by the spline protrusion 32 and the spline groove 62. The spline groove 62 is formed in the spindle 30 so as to extend in the axial direction of the drawbar 60. [ Wherein a linear movement in the axial direction is possible and a relative rotation is impossible. The apparatus of claim 1, wherein a plurality of circulating balls (56) are provided between the female threads (51) of the cylinder (50) and the valleys of the male threads (61) The electric drive of the machine tool. The chucking machine according to claim 1, wherein a chuck housing (80) having a chuck for fixing a workpiece is coupled to a front end of the spindle (30), the drawbar (60) And the jaw of the chuck is gripped by the backward movement of the drawbar (60). A driving method using an electric driving apparatus according to any one of claims 1 to 3 and 5 to 8,
A first step in which the clutch drive unit moves the clutch coupler (70) in one direction to couple the clutch coupler (70) to the spindle (30) and the fixed portion (10);
A second step in which the drive shaft (20) receives power from the motor and rotates to reduce the speed of the reduction gear unit;
A third step of moving the drawbar (60) backward by a predetermined distance in the axial direction by the reduced rotation of the cylinder (50);
A fourth step in which the clutch drive unit moves the clutch coupler (70) in a direction opposite to the moving direction in the first step, so that the clutch coupler (70) binds the spindle (30) and the drive shaft (20);
And a fifth step of rotating the spindle (30) and the drawbar (60) while rotating the drive shaft (20) by receiving power from the motor, thereby processing the workpiece.
KR1020140180369A 2014-12-15 2014-12-15 Electric Driving System for Machine And Driving Method Thereof KR101639688B1 (en)

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KR1020140180369A KR101639688B1 (en) 2014-12-15 2014-12-15 Electric Driving System for Machine And Driving Method Thereof
PCT/KR2015/013736 WO2016099119A1 (en) 2014-12-15 2015-12-15 Electrical driving device and method for machining tool

Applications Claiming Priority (1)

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KR1020140180369A KR101639688B1 (en) 2014-12-15 2014-12-15 Electric Driving System for Machine And Driving Method Thereof

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