KR20090111492A - 2-Spindle Type Horizontal Machining Center - Google Patents

Abstract

PURPOSE: A two-spindle type horizontal machining center is provided to reduce the work time in continuous processing by employing a pair of spindles controlled independently. CONSTITUTION: A two-spindle type horizontal machining center comprises a bed part(10) with a table on which a work piece is placed, a pair of Y-axis moving units which are formed on the upper side of the bed part and move together or separately in a Y-axis direction, column units(20) supported on the respective Y-axis moving units, a pair of X-axis moving units which are supported on the column units and move together or separately in an X-axis direction, a pair of Z-axis moving units which are supported on the supported on the and move together or separately in a Z-axis direction, and a control unit which controls the above units.

Description

Horizontal Machining Center with Dual Spindle Type {2-Spindle Type Horizontal Machining Center}

The present invention relates to a horizontal machining center which is a kind of machine tool, and more particularly, to a horizontal machining center to which a pair of spindles capable of simultaneous or independent control is applied.

In general, a machine tool having an automatic tool changer (ATC) for automatically exchanging a tool to a numerically controlled machine tool NC is called a machining center.

Such machining centers automatically process workpieces requiring various operations such as milling, boring, or cutting, and are classified as horizontal machining centers or vertical machining centers according to the position of the spindle, and are disposed in the X, Y, and Z directions. It is designed as a structure including three axes.

At this time, the horizontal machining center is connected to a plurality of machining tools to rotate the drive means to be rotated at the time of tool selection, remove the selected tool from the tool magazine, remove the tools mounted on the spindle head to remove these tools It has an automatic tool changer that can be replaced, so that when all the tools required for machining are mounted in the tool magazine, various operations can be performed in one machining center.

That is, the horizontal machining center is not shown in the drawings, but the bed portion, the Y-axis transfer unit formed on the upper surface of the bed portion and movable in the Y-axis direction (left and right), the column portion supported by the Y-axis transfer unit, the column portion It is provided with an X-axis transfer unit supported and movable in the X-axis direction (up and down), a Z-axis transfer unit supported by the X-axis transfer unit (moving forward and backward), and a spindle installed in the Z-axis transfer unit have.

And the upper part of the column is provided with an automatic tool changer unit (Atomatic Ttool Changer Unit) consisting of a tool magazine and a tool changer (not shown) having a plurality of machining tools to be supplied to the spindle.

However, the conventional horizontal machining center has only one spindle, and thus, there is a structural disadvantage in that productivity is deteriorated while a lot of working time is required during continuous machining of the workpiece.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, horizontal machining having a double spindle structure consisting of a pair of spindles in which the feed rate and position control is controlled simultaneously or independently in the horizontal machining center The purpose is to provide a center.

Horizontal machining center having a double spindle structure of the present invention for achieving the above object; A bed part having a table on which a work piece is placed; A pair of Y-axis transfer units formed on the upper surface of the bed and simultaneously or independently transferred in the Y-axis direction (left and right); A column portion supported by the pair of Y-axis transfer units, a pair of X-axis transfer units supported by the column portion and simultaneously or independently transferred in the X-axis direction (up and down); A pair of Z-axis transport units supported by the pair of X-axis transport units, simultaneously or independently transported in the Z-axis direction (forward and backward), to which spindles equipped with machining tools are coupled; A control unit for controlling the units; Includes, the pair of spindles is characterized in that the connection configuration by the position correction member.

In addition, the horizontal machining center is provided on each side of the pair of Z-axis transfer unit, a pair of tool automatic exchange unit for automatically or independently replacing the machining tool on the pair of spindles at the same time; It includes more.

In addition, the table comprises a fixed table and a rotating table on which the workpiece is mounted and having a rotation axis, wherein the rotation table is unclamped / clamped by a drive unit under the control of the control unit, and the rotation axis is centered. Configured to rotate.

The driving unit may include a piston for raising (unclamping) and lowering (clamping) the rotary table, and driving the rotary table about the rotary shaft (B axis) when the rotary table is raised by the piston. It includes a motor and a position sensor for sensing the rising and falling state of the rotary table by the piston.

In addition, the control unit is controlled by the position sensor to turn off the transfer operation of the Y-axis transfer unit, X-axis transfer unit, Z-axis transfer unit when the rotary table is in an unclamping state, and Y when the rotary table is in a clamping state A program for mounting and controlling the transfer operation of the axis transfer unit, the X axis transfer unit, and the Z axis transfer unit is provided.

In addition, the filler is configured in the bed portion to prevent shaking due to the load generated during the processing of the workpiece.

In addition, the Y-axis transfer unit is fixed to transfer a pair of Y-axis slider and the Y-axis slider, both ends are respectively supported in the bed portion and the simultaneous or independent transfer is made in the Y-axis direction (left and right). It includes a pair of Y-axis motors that drive in reverse rotation.

In addition, the X-axis conveying unit is supported by each of the pair of Y-axis slider and to convey a pair of X-axis slider and the X-axis slider to be carried out simultaneously or independently in the X-axis direction (up and down) Includes a pair of X-axis motors running in forward / reverse rotation.

In addition, the Z-axis transfer unit is supported by the X-axis slider, respectively, a pair of Z-axis sliders are coupled to each other a pair of spindles to be carried out simultaneously or independently in the Z-axis direction (forward and backward), And a pair of Z-axis motors driving forward / reverse rotation to feed the Z-axis slider.

In addition, the pair of spindles are each directly connected to the motor, characterized in that the acceleration and deceleration and the load amount according to the driving of the direct motor is sensed by the sensor.

In addition, the position correction member includes a first and second rods connected by an elastic body, one end of the first and second rods are made of the axial coupling overlapping each other, the other end is respectively coupled to the spindle shaft It features.

As described above, the present invention constitutes a pair of spindles in which the feed speed and the position control are controlled simultaneously or independently in the horizontal machining center, thereby improving productivity by shortening the working time during continuous machining of the workpiece. The effect of improving the inefficiency caused by the excessive input of manpower is obtained.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a front view showing a structure of a horizontal machining center having a double spindle structure in an embodiment of the present invention, Figure 2 is a side view showing a structure of a horizontal machining center having a double spindle structure in an embodiment of the present invention, 3 is a plan view showing the structure of a horizontal machining center having a double spindle structure in an embodiment of the present invention.

4 is a block diagram showing an operation flow of a horizontal machining center having a double spindle structure in an embodiment of the present invention, Figure 5 is an embodiment of the present invention showing an unclamping / clamping state of the table for the B-axis Figure 6 is a side schematic view, Figure 6 shows a side schematic view showing the rotation of the table about the B axis in an embodiment of the present invention.

7 is a plan view schematically showing the Y-axis and X-axis transfer state of the horizontal machining center having a double spindle structure in an embodiment of the present invention, Figure 8 is a horizontal machining center having a double spindle structure in an embodiment of the present invention 9 is a front schematic view showing a Y-axis and an X-axis feed state, and FIG. 9 is a side schematic view showing a Z-axis feed state of a horizontal machining center having a dual spindle structure according to an embodiment of the present invention.

The X-axis direction, the Y-axis direction, and the Z-axis direction described below will be described as indicating the up, down, left, and right directions, respectively.

1 to 9, a horizontal machining center having a dual spindle structure according to an exemplary embodiment of the present invention includes a bed unit 10, a column unit 20, a control unit 60, and a position correction member 70. ) And a drive unit 90, as well as a pair of symmetrical structures for simultaneously or independently controlling a pair of spindles (SP1) (SP2) Y-axis feed unit 30, X-axis feed unit ( 40), the Z-axis transfer unit 50, and comprises a tool automatic replacement unit (80).

The bed unit 10 is a table 11 on which the workpiece is placed while the B-axis and C-axis rotation is made by the drive unit 90, it is possible to maintain the accuracy by minimizing the warpage caused by thermal deformation To be cast.

Here, the inside of the bed 10 is filled with a filler (not shown) such as mortar so as to correct the mechanical static and dynamic accuracy and to prevent shaking due to the workpiece cutting load during processing.

At this time, the table 11 includes a rotary table 11c having a fixed table 11a and a workpiece on which the rotary table (B-axis) 11b is mounted, and the rotary table 11c includes the control unit 60. By the drive unit 90 under the control of the) is configured to unclamp the rising or clamping the falling, and to rotate about the rotation axis (11b).

The column part 20 is a structure that is fixed to the upper portion of the Y-axis transfer unit 30 as a casting material, a reinforcement rib (not shown) is formed inside to maintain the degree of processing by heat deformation, the X-axis It is configured to support both ends of the X-axis transfer unit 40 for correcting the degree of deflection caused by the amount of movement of the transfer unit 40.

The Y-axis transfer unit 30 includes a pair of Y-axis sliders 31a and 31b, and a pair of Y-axis motors 32a and 32b.

The pair of Y-axis sliders 31a and 31b is formed as a casting material so that the feed is simultaneously or independently performed in the Y-axis direction (left and right) while both ends are supported by the bed part 10, respectively.

The pair of Y-axis motors 32a and 32b are controlled by the control unit 60 to perform forward or reverse rotation simultaneously or independently, and the pair of Y-axis sliders 31a ( 31b) are respectively conveyed with respect to the Y-axis direction.

That is, the pair of Y-axis sliders 31a and 31b are conveyed to the left and the right, respectively, in a direction away from each other or to face each other, or simultaneously to the left (or the right).

The X-axis transfer unit 40 includes a pair of X-axis sliders 41a and 41b, and a pair of X-axis motors 42a and 42b.

The pair of X-axis sliders 41a and 41b are coupled to the pair of Y-axis sliders 31a and 31b, respectively, and are transferred in the Y-axis direction by the Y-axis sliders 31a and 31b. This is, of course, configured to be carried out simultaneously or independently in the X-axis direction (up and down).

The pair of X-axis motors 42a and 42b are controlled by the control unit 60 to perform forward or reverse rotation simultaneously or independently, and the pair of X-axis sliders 41a ( 41b) are respectively conveyed with respect to the X-axis direction.

That is, the X-axis sliders 41a and 41b are moved to the left and right in the Y-axis direction by the Y-axis sliders 31a and 31b, but are independently transferred or the same to each other in the vertical direction which is X. It is configured to be transported.

The Z-axis transfer unit 50 includes a pair of Z-axis sliders 51a and 51b, and a pair of Z-axis motors 52a and 52b.

The pair of Z-axis sliders 51a and 51b are supported by the pair of X-axis sliders 41a and 41b, respectively, and a pair of spindles SP1 and SP2 are coupled to each other. It is configured to allow simultaneous or independent conveyance with respect to the direction (forward and backward).

The Z-axis motors 52a and 52b are controlled by the control unit 60 to simultaneously perform forward rotation or reverse rotation or are independent of each other. The pair of Z-axis sliders 51a and 51b may be controlled. Each of which is configured to feed relative to the Z-axis direction.

At this time, the pair of spindles (SP1) (SP2) coupled to the machining tool is coupled to each of the motor (M1) (M2) is directly connected, and the acceleration and deceleration amount according to the drive of the directly connected motor (M1) (M2) The load amount is sensed by the sensor S1, and the detected information is configured to be transmitted to the control unit 60.

That is, the pair of spindles SP1 and SP2 may be driven simultaneously or independently under the control of the control unit 60 to simultaneously cut or process the same plurality of workpieces by a machining tool, or may be different from each other. Each work piece is to be cut independently.

Here, the above-mentioned pair of Y-axis motors 32a and 32b, X-axis motors 42a and 42b, Z-axis motors 52a and 52b, and motors M1 and M2 are control units ( 60) is composed of a servo motor capable of numerical control (NC).

The position correction member 70 includes an elastic body 73 and first and second rods 71 and 72, and both ends of the elastic body 73 are connected to the first and second rods 71 and 72. The first and second rods 71 and 72 prevent the opening of the first and second rods 71 and 72 by a predetermined width, and the first and second rods 71 and 72 are coupled to each other at one end thereof. This is done and the other end is coupled to each of the spindle (SP1) (SP2) shaft.

That is, in the state where the first and second rods 71 and 72 are supported by the elastic body 73, the spindles SP1 and SP2 are in the Y-axis direction by the Y-axis sliders 31a and 31b. It is configured to correct the position of the paired spindles SP1 and SP2 with respect to the workpiece when the spreading or narrowing is carried out to the left and right sides.

The tool auto change unit 80 is a pair of symmetrical structures, for automatically or independently replacing the tool for machining on the pair of spindles SP1 and SP2, respectively, of the control unit 60 It is configured to be controlled, and are respectively installed on the side of the Z-axis transfer unit (50).

The drive unit 90 includes a piston 91, a first motor 92, and a position sensor 93.

The piston 91 raises (unclamps) or lowers (clamps) the rotary table 11c included in the table 11, and the first motor 92 is rotated by the piston 91. When the 11c) rises, the rotary table 11c is driven to be rotated forward / reversely under the control of the control unit 60 so as to rotate (B-axis) the rotary table 11c about the rotary shaft 11b, and the position sensor 93 Is configured to detect the rising and lowering state of the rotary table (11c) by the piston 91 and to transmit it to the control unit 60, the position sensor 93 is preferably a limit switch but this It is not limited to this.

The control unit 60 is equipped with a program for numerically controlling the motors included in the Y-axis transfer unit 30, the X-axis transfer unit 40 and the Z-axis transfer unit 50 independently or simultaneously. It is configured to control the automatic tool change of the tool automatic change unit 80, and the operation of the drive unit (90).

That is, while the numerical control program is set by the operator, the control unit 60 numerically controls the motors independently or simultaneously.

Here, the control unit 60 controls the tool automatic change unit 80, when the tool replacement of the tool for processing is made, the time of the tool change is the Y-axis transfer unit 30 and the X-axis transfer unit 40 And, the program is configured to be mounted at any point even if the Z-axis transfer unit 50 does not return to the origin.

At this time, the control unit 60, the Y-axis feed unit 30, the X-axis when the rotary table (11c) is in an unclamped state (rising) by the position sensor 93 included in the drive unit 90 In addition to the transfer operation of the transfer unit 40 and the Z-axis transfer unit 50, the cutting processing of the pair of spindles SP1 and SP2 is controlled off, and when the rotary table 11c is clamped, Y A program for controlling the cutting operations of the spindles SP1 and SP2 as well as the feeding operation of the axis feed unit 30, the X axis feed unit 40, and the Z axis feed unit 50, is mounted. This is to prevent machining defects on the workpiece during transfer and cutting.

Referring to Figures 1 to 9 attached to the operation of the vertical machining center according to an embodiment of the present invention configured as described above are as follows.

First, a table 11 is formed in the bed 10, and the table 11 includes a fixed table 11a and a rotating table 11b. The work is placed on the rotating table 11b. In the set state, the driving unit 90 under the control of the control unit 60 is driven to set the processing position of the workpiece.

That is, after the rotary table 11b is unclamped through the piston 91 included in the driving unit 90, the raised rotary table 11b of the first motor 92 is moved. When it rotates as needed by drive control, the processing position of the to-be-processed object mounted on the said rotating table 11b is set according to the said rotation amount.

Then, the unclamping state is transmitted to the control unit 60 sensed by the position sensor 93, the control unit 60 is a pair of Y-axis transfer unit 30, X-axis transfer unit ( 40), as well as the transfer operation of the Z-axis transfer unit 50, the cutting processing of a pair of spindle (SP1) (SP2) is controlled off.

Thereafter, when the rotary table 11b is lowered in the clamping state through the piston 91 included in the driving unit 90, the clamping state is detected by the position sensor 93 and then transferred to the control unit 60. The control unit 60 accordingly transfers the cutting operations of the spindles SP1 and SP2 as well as the transfer operation of the Y-axis transfer unit 30, the X-axis transfer unit 40, and the Z-axis transfer unit 50. To control.

That is, when the Y-axis motor 32a, 32b of the paired Y-axis transfer unit 30 performs the forward rotation or the reverse rotation drive under the control of the control unit 80 simultaneously or independently, The pair of Y-axis sliders 31a and 31b are simultaneously moved to the left (or right) with respect to the Y-axis direction from the driving force, or one Y-axis slider 31a is to the left (or right). When moving, another Y-axis slider 31b moves to the right (or left), respectively, or one of the pair of Y-axis sliders 31a and 31b is stopped and only another slider is stopped. To the left or right.

At this time, the pair of X-axis sliders (31a) (31b) are provided with a pair of X-axis sliders (41a) (41b) included in the X-axis transfer unit 40, respectively, the pair of X Y-axis feed is also linked to the axis sliders 41a and 41b, and the Z-axis feed unit 50 fixed to the pair of X-axis sliders 41a and 41b and the Z-axis feed unit 50. Spindles SP1 and SP2 coupled to the spindle are also capable of feeding in the Y-axis direction.

On the other hand, the pair of X-axis sliders (41a) (41b) is a pair of X-axis motors (42a) (42b) under the control of the control unit 60 at the same time or forward or reverse rotation drive When driving is made in a different rotational direction through control, the pair of X-axis sliders 41a and 41b simultaneously move downwards (or rises) with respect to the X-axis direction from the driving force, or one X-axis. When the slider 41a is moved down (or raised), another X-axis slider 41b is moved up or down, respectively, or a pair of X-axis sliders 41a and 41b are transferred. Either of which is stopped and the only one slider is moved in the downward or upward direction.

On the other hand, the pair of Z-axis sliders 51a and 51b equipped with the pair of spindles SP1 and SP2 are a pair of Z-axis motors 52a and 52b which are controlled by the control unit 60. When the forward rotation or reverse rotation is simultaneously performed, or when driving is performed in different rotation directions through individual control, the pair of Z-axis sliders 51a and 51b move forward in the Z-axis direction from the driving force. When (or backward) feeds at the same time, or when one Z-axis slider 51a moves backward (or forward), another Z-axis slider 51b moves forward (or reverse) respectively. One of the pair of Z-axis sliders 51a and 51b is stopped, and only one slider is moved in the downward or upward direction.

That is, the rotary table 11b included in the table 11 is moved up and down about the B axis and the C axis by the drive unit 90 under the control of the control unit 60, and the pair of The spindles SP1 and SP2 are simultaneously transported in the left, right, up and down directions, and the forward and backward directions by the Y-axis feed unit 30, the X-axis feed unit 40, and the Z-axis feed unit 50, respectively. Alternatively, three-dimensional conveying can be performed independently.

Accordingly, the plurality of workpieces placed on the rotary table 11b of the table 11 may be cut from the machining tool mounted on the pair of spindles SP1 and SP2, respectively, while the cuttings are simultaneously or independent. It can be done.

That is, when a plurality of workpieces of the same shape required by the same cutting work are placed on the rotary table 11b of the table 11, the workpieces are set in the state set by the drive unit 90. The pair of spindles SP1 and SP2 are simultaneously transferred in the Y-axis, X-axis, and Z-axis directions.

Next, when a pair of motors M1 and M2 directly connected to the pair of spindles SP1 and SP2 are simultaneously driven, the machining tool mounted on the pair of spindles SP1 and SP2 It is possible to simultaneously perform cutting on a plurality of workpieces.

On the other hand, when a plurality of different workpieces required for different cutting operations are placed on the rotary table 11b of the table 11, the workpieces are set in position by the drive unit 90. The pair of spindle (SP1) (SP2) is independently transferred in the X-axis, Y-axis and Z-axis direction.

Next, when the motors M1 and M2 directly connected to the pair of spindles SP1 and SP2 are driven independently of each other, the machining tools mounted on the pair of spindles SP1 and SP2 are respectively. By driving in an independent control mode, a plurality of different workpieces are individually cut.

In this case, when a separate cutting process for a plurality of workpieces is made as described above, the pair of spindles SP1 and SP2 should be equipped with different machining tools, which are controlled by the control unit 60. It is possible by a pair of tool automatic change unit 80.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

1 is a front view showing the structure of a horizontal machining center having a double spindle structure in an embodiment of the present invention.

Figure 2 is a side view showing the structure of a horizontal machining center having a double spindle structure in an embodiment of the present invention.

Figure 3 is a plan view showing a structure of a horizontal machining center having a double spindle structure in an embodiment of the present invention.

Figure 4 is a block diagram showing the operation of the horizontal machining center having a double spindle structure in an embodiment of the present invention.

Figure 5 is a schematic side view showing an unclamping / clamping state of the table for the B axis in an embodiment of the invention.

Figure 6 is a side schematic view showing a state of rotation of the table about the B axis in an embodiment of the present invention.

Figure 7 is a plan view showing the Y-axis and X-axis feed state of the horizontal machining center having a double spindle structure in an embodiment of the present invention.

Figure 8 is a front schematic view showing the Y-axis and X-axis feed state of the horizontal machining center having a double spindle structure in an embodiment of the present invention.

Figure 9 is a schematic side view showing the Z-axis feed state of the horizontal machining center having a double spindle structure in an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10; Bed section 11; table

11a; Fixed table 11b; Axis of rotation

11c; Rotary table 20; Column part

30; Y axis transfer unit 31a, 31b; Y-axis slider

32a, 32b; Y-axis motor 40; X-axis feed unit

41a, 41b; X-axis sliders 42a and 42b; X axis motor

50; Z axis transfer unit 51a, 51b; Z-axis slider

52a, 52b; Z axis motor 60; Control unit

70; Position correction members 71, 72; 1st and 2nd load

73; Elastomer 80; Tool auto change unit

90; Drive unit 91; piston

92; First motor 93; Position sensor

SP1, SP2; Spindles M1, M2; motor

S1; sensor

Claims (11)

A bed part having a table on which a work piece is placed; A pair of Y-axis transfer units formed on the upper surface of the bed and simultaneously or independently transferred in the Y-axis direction (left and right); Column portions supported by the pair of Y-axis transfer units, respectively; A pair of X-axis transfer units which are supported by the column part and simultaneously or independently transferred in the X-axis direction (up and down); A pair of Z-axis transport units supported by the pair of X-axis transport units, simultaneously or independently transported in the Z-axis direction (forward and backward), to which spindles equipped with machining tools are coupled; A control unit for controlling the units; Including, The pair of spindles is a horizontal machining center having a dual spindle structure, characterized in that the connection configuration by the position correction member. The method of claim 1, The horizontal machining center is provided on each side of the pair of Z-axis transfer unit, a pair of tool automatic exchange unit for automatically or independently replacing the machining tool on the pair of spindles simultaneously; Horizontal machining center having a dual spindle structure, characterized in that it further comprises a. The method according to claim 1 or 2, The table comprises a fixed table and a rotating table on which the workpiece is mounted and having a rotating shaft, The rotary table is a horizontal machining center having a double spindle structure, characterized in that configured to rotate around the axis of rotation and unclamping / clamping by the drive unit under the control of the control unit. The method of claim 3, wherein the drive unit, A piston for raising (unclamping) and lowering (clamping) the rotary table, a first motor for driving the rotary table to rotate about the rotary axis (B axis) when the rotary table is raised by the piston, Horizontal machining center having a double spindle structure characterized in that it comprises a position sensor for detecting the rising and falling state of the rotary table by the piston. The method according to claim 1 or 2, wherein the control unit, When the rotary table is in an unclamped state by the position sensor, the transfer operation of the Y-axis transfer unit, X-axis transfer unit, Z-axis transfer unit is controlled off, A horizontal machining center having a dual spindle structure, characterized in that the program is configured to control the transfer operation of the Y-axis transfer unit, X-axis transfer unit, Z-axis transfer unit when the rotary table is clamped. The horizontal machining center of claim 1 or 2, wherein a filling material is configured to prevent shaking due to a load generated during processing of the workpiece. According to claim 1 or 2, wherein the Y-axis transfer unit, A pair of Y-axis sliders which are supported at both ends of the bed portion and which are fed simultaneously or independently in the Y-axis direction (left and right); Horizontal machining center having a dual spindle structure characterized in that it comprises a pair of Y-axis motor for driving forward / reverse rotation to move the Y-axis slider. The method of claim 1 or 2, wherein the X-axis transfer unit, A pair of X-axis sliders respectively supported by the pair of Y-axis sliders and configured to simultaneously or independently move in the X-axis direction (up and down); Horizontal machining center having a dual spindle structure characterized in that it comprises a pair of X-axis motor for driving forward / reverse rotation to transfer the X-axis slider. The method of claim 1 or 2, wherein the Z-axis transfer unit, A pair of Z-axis sliders respectively supported by the X-axis slider and having a pair of spindles coupled to each other to simultaneously or independently move in the Z-axis direction (forward and backward); Horizontal machining center having a dual spindle structure characterized in that it comprises a pair of Z-axis motor for driving forward / reverse rotation to move the Z-axis slider. The method according to claim 1 or 2, A motor is directly connected to each of the pair of spindles, and a horizontal machining center having a double spindle structure, wherein the acceleration and deceleration amount and the load amount according to the driving of the directly connected motor are sensed by a sensor. The method of claim 1 or 2, wherein the position correction member, It comprises a first and second rods connected by an elastic body, one end of the first and second rods is made of a axial coupling overlapping each other, the other end is a dual spindle structure characterized in that each is axially coupled to the spindle Horizontal machining center with branches.

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