Columns and machine tools

Abstract

To provide: a column that achieves a reduction in displacement due to torsion; and a machine tool.SOLUTION: In the machine tool, a spindle head extends in a Z-axis direction and is disposed on a front surface of a column 5 through a Y-axis moving mechanism. A rotary table is located in front of the spindle head. The spindle head is movable in the Y-axis direction (up-down direction) by being guided by a pair of guides 24 that are mounted on mounting surfaces 52R, 52L of the column 5. The mounting surface 52R is located at a left front end of a right wall 51A. The mounting surface 52L is located at a right front end of a left wall 51B. The column 5 is movable in the Z-axis direction (front-back direction) through sliding members 57, 58 thereof being guided by a pair of guides. The sliding member 57 has a portion located further forward than the mounting surfaces 52R, 52L in a plan view.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a column and a machine tool.

Background Art

[0002] Patent Document 1 discloses a horizontal machine tool that performs cutting and other machining on a workpiece fixed on a rotary table by a spindle extending in the horizontal direction. On the base of the machine tool, a carriage movable in the X-axis (left and right) direction is provided. On the carriage, a column movable in the Z-axis (front and back) direction is provided. A spindle head movable in the Y-axis (up and down) direction with respect to the column is provided. A spindle is rotatably supported by the spindle head, and a tool is attached to the spindle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The column supports the spindle head so as to be movable in the Y-axis direction. During workpiece machining, the column receives a reaction force from the workpiece via the tool, the spindle, and the spindle head. The column may be twisted horizontally with respect to the base due to the reaction force. When the column is twisted horizontally, the position of the tool with respect to the workpiece is displaced. If the displacement due to the twist is large, the machine tool may not be able to accurately machine the workpiece.

[0005] An object of the present invention is to provide a column and a machine tool capable of reducing the displacement due to twist.

Means for Solving the Problems

[0006] The vertical column according to claim 1 is positioned above the base of a machine tool, spaced apart from the workbench that holds the workpiece, and supports the spindle head that holds the spindle. The vertical column comprises a mounting surface positioned on the surface facing the workbench for mounting an upper and lower guide portion that guides the vertical movement of the spindle head, and an intersecting guide portion positioned on the lower wall for guiding the movement of the vertical column in an intersecting direction that intersects the upper and lower direction, wherein in a plan view, at least a portion of the intersecting guide portion is closer to the workbench than the mounting surface. Compared to a vertical column where at least a portion of the intersecting guide portion is positioned closer to the workbench than the mounting surface in a plan view, the position of the center of rotation of the twist relative to the base is closer to the workbench. In this case, the distance from the center of rotation of the twist to the tip of the tool is shorter. Therefore, the vertical column can reduce displacement due to twisting during machining.

[0007] In the upright column according to claim 2, the crossing guide portion comprises a first crossing guide portion and a second crossing guide portion positioned on the opposite side of the workbench from the first crossing guide portion, and in a plan view, the first crossing guide portion may be closer to the workbench than the mounting surface. The upright column is positioned with the first crossing guide portion and the second crossing guide portion separated by the mounting surface. As a result, the upright column can be guided more stably than when both the first and second crossing guide portions are positioned on the workbench side of the mounting surface. Therefore, the upright column can move stably in the crossing direction.

[0008] In the upright column according to claim 3, the lower wall has a projection that protrudes toward the workbench side from the mounting surface, the projection is supported from below by the first crossing guide, and its upper end may be inclined downward as it moves toward the workbench side. Since the upper end of the projection is inclined downward as it moves toward the workbench side, the upright column can be supported without reducing rigidity. Therefore, the upright column can move stably in the crossing direction.

[0009] The machine tool according to claim 4 is characterized by comprising the vertical column described in claim 3. Therefore, the machine tool can obtain the same effects as claim 3.

[0010] In the machine tool of claim 5, the spindle may extend horizontally. When the spindle extends horizontally, the torsional displacement at the tip of the tool becomes larger when twisting occurs. In a machine tool, the distance from the center of rotation of the twist to the tip of the tool becomes shorter. Therefore, even when the axial direction is horizontal, the machine tool can reduce the displacement due to twisting during machining. [Brief explanation of the drawing]

[0011] [Figure 1] Perspective view of machine tool 1 (spindle head 6: raised). [Figure 2] Perspective view of machine tool 1 (spindle head 6: downward). [Figure 3] Right side view of machine tool 1 (spindle head 6: raised). [Figure 4] Right side view of machine tool 1 (spindle head 6: lowering). [Figure 5] Plan view of machine tool 1. [Figure 6] Perspective view of column 5. [Figure 7] Right side view of column 5. [Figure 8] Plan view of column 5 [Figure 9] Diagram illustrating the twisting of workpiece 99 during machining at vertical columns 5 and 60. [Modes for carrying out the invention]

[0012] One embodiment of the present invention will be described. The following description will use the left / right, front / back, and up / down directions indicated by arrows in the figures. The left / right direction, up / down direction, and front / back direction of the machine tool 1 are the X-axis direction, Y-axis direction, and Z-axis direction of the machine tool 1, respectively. The machine tool 1 shown in Figure 1 is horizontal in which the spindle 7 (see Figure 3), described later, extends in the front / back direction (Z-axis direction), and the vertical column 5, described later, moves in the X-axis direction and the Z-axis direction.

[0013] The structure of machine tool 1 will be described with reference to Figures 1 to 5. As shown in Figures 1 and 2, machine tool 1 includes a base 2, a column 5, frame covers 10 and 20, a spindle head 6, a spindle 7 (see Figure 3), a control box 8, a rotary table 9, an X-axis movement mechanism 11, a Z-axis movement mechanism 12, a Y-axis movement mechanism 13, etc. The base 2 is a roughly rectangular iron base that is long in the Z-axis direction. The X-axis movement mechanism 11 is located at the rear of the upper surface of the base 2 and supports the movable body 15 so that it can move in the X-axis direction. The Z-axis movement mechanism 12 is located on the upper surface of the movable body 15 and supports the column 5 so that it can move in the Z-axis direction.

[0014] The vertical column 5 extends vertically. The detailed structure of the vertical column 5 will be described later. The frame cover 10 is attached to the top of the vertical column 5. The frame cover 10 is a rectangular frame in plan view and covers the vertical column 5 from the outside. The frame cover 20 is attached to the front of the vertical column 5. The frame cover 20 is a vertically elongated rectangular frame in front view and covers the gap between the vertical column 5 and the spindle head 6 (described later) from the outside. The top surface of the frame cover 20 has a hole that corresponds to the outer circumference shape of the base 21 (described later). The Y-axis movement mechanism 13 is located on the front of the vertical column 5 and supports the spindle head 6 so that it can move in the Y-axis direction.

[0015] The X-axis movement mechanism 11 comprises a pair of guides, a ball screw, and an X-axis motor. The Z-axis movement mechanism 12 comprises a pair of guides 25 (see Figure 5), a ball screw, and a Z-axis motor. The pair of guides 25 are rail-shaped and extend in the front-rear direction, and are spaced apart from each other in the left-right direction. The Y-axis movement mechanism 13 comprises a pair of guides 24 (see Figure 6), a ball screw 27 (see Figure 1), and a Y-axis motor. The pair of guides 24 are rail-shaped and extend in the up-down direction, and are mounted on the front side of the vertical column 5, spaced apart from each other in the left-right direction (see Figure 6). The X-axis movement mechanism 11, the Z-axis movement mechanism 12, and the Y-axis movement mechanism 13 move the target component (moving body 15, vertical column 5, spindle head 6) along their respective guides using the power of their respective motors.

[0016] The frame cover 20 has a pedestal 21 at its upper part. The pedestal 21 is substantially rectangular in plan view. The pedestal 21 has a support hole 21A that penetrates its upper surface in the vertical direction. The Y-axis motor of the Y-axis movement mechanism 13 (see FIG. 1) is inserted and fixed in the support hole 21A. The rotation shaft of the Y-axis motor protrudes downward inside the frame cover 20 and is connected to the upper end of the ball screw 27 (see FIG. 1).

[0017] As shown in FIGS. 1 to 4, the spindle head 6 extends in the Z-axis direction and is arranged to be movable in the Y-axis direction along the front surface of the column 5 by the Y-axis movement mechanism 13. The spindle head 6 includes an upper cover 28 and a lower cover 85. The upper cover 28 is a substantially rectangular metal plate in front view. The lower end of the upper cover 28 is fixed to the rear end of the upper surface of the spindle head 6.

[0018] The upper cover 28 extends upward from the rear end of the upper surface of the spindle head 6. The upper cover 28 is arranged in front of the frame cover 20 and the pedestal 21 (see FIGS. 3 and 4). By moving up and down integrally with the spindle head 6, the upper cover 28 always covers the area above the spindle head 6 on the front surface of the column 5 from the front. The lower cover 85 is fixed in a suspended state to the rear end of the lower surface of the spindle head 6. The lower cover 85 includes a plurality of metal plates arranged vertically, and by expanding and contracting vertically according to the height of the spindle head 6, the lower cover 85 always covers the area below the spindle head 6 on the front surface of the column 5 from the front (see FIGS. 1 and 2).

[0019] As shown in FIGS. 3 and 4, the spindle 7 is arranged inside the spindle head 6 and extends in the Z-axis direction. The spindle head 6 supports the spindle 7 rotatably. The rear part of the spindle head 6 holds a spindle motor (not shown). The output shaft of the spindle motor extends forward and is coaxially connected to the rear end of the spindle 7. By driving the spindle motor, the spindle 7 rotates around the Z-axis. A tool holder 90 (see FIG. 5) is detachably mounted on the spindle 7. The tool holder 90 holds a tool 91 on the front side.

[0020] The base 2 has a pair of support members 17, 18 (see FIG. 5) at its rear part. The support members 17, 18 are spaced apart from each other in the left-right direction and extend upward to support the control box 8 from below. The control box 8 houses a control panel (not shown) inside. The control panel controls the operation of the machine tool 1.

[0021] Base 2 is equipped with a fixed base 16 on its upper front side. The fixed base 16 is positioned in front of the X-axis movement mechanism 11. The rotary table 9 is rotatably supported on the fixed base 16. The rotary table 9 is located in front of the spindle head 6. The rotary table 9 can fix a workpiece 99 (see Figure 9) to its upper surface with a jig (not shown) and can rotate 360° around a rotation axis parallel to the Y-axis direction.

[0022] Referring to Figures 6 to 8, the structure of the column 5 will be explained. The column 5 is a rectangular tube with a vertically elongated shape when viewed from the front. The column 5 has a right wall 51A, a left wall 51B, an upper wall 51C, and a lower wall 51D. The column 5 has a through-hole 5A surrounded by the right wall 51A, the left wall 51B, the upper wall 51C, and the lower wall 51D. The through-hole 5A is a vertically elongated rectangle when viewed from the front.

[0023] The right wall 51A has mounting surfaces 52R and 54R. Mounting surface 52R is located at the left front end of the right wall 51A. Mounting surface 54R is located at the right front end of the right wall 51A and to the right of mounting surface 52R. Mounting surface 54R is located behind mounting surface 52R (see Figure 8). Mounting surfaces 52R and 54R are elongated rectangles when viewed from the front.

[0024] Mounting surface 52R has multiple screw holes 52A arranged in the vertical direction. One of a pair of guides 24 is attached to mounting surface 52R by screwing screws into the screw holes 52A. Mounting surface 54R has multiple screw holes 54A arranged in the vertical direction. The frame cover 20 is attached to mounting surface 54R by screwing screws into the screw holes 54A.

[0025] Mounting surface 52L is located at the right front end of the left wall 51B. Mounting surfaces 52R and 52L are aligned at the same position in the front-to-back direction. Mounting surface 54L is located behind mounting surface 52L (see Figure 8). Mounting surface 54L is located at the left front end of the left wall 51B and to the left of mounting surface 52L. Mounting surface 54L is located behind mounting surface 52L (see Figure 8). Mounting surfaces 54R and 54L are aligned at the same position in the front-to-back direction. Mounting surfaces 52L and 54L are vertically elongated rectangles when viewed from the front.

[0026] The mounting surface 52L has multiple screw holes 52B arranged in the vertical direction. The other of the pair of guides 24 is attached to the mounting surface 52L by screwing screws into the screw holes 52B. The mounting surface 54L has multiple screw holes (not shown) arranged in the vertical direction. The frame cover 20 is attached to the mounting surface 54L by screwing screws into these screw holes.

[0027] Mounting surfaces 53R and 53L are positioned on the upper wall 51C. Mounting surface 53R is positioned to the upper left of mounting surface 52R. Mounting surface 53L is positioned to the upper right of mounting surface 52L. As shown in Figure 8, mounting surface 53R is positioned behind mounting surface 52R, and mounting surface 53L is positioned behind mounting surface 52L. Mounting surfaces 53R and 53L are aligned at the same position in the front-to-back direction. Mounting surfaces 53R and 53L are vertically elongated rectangles when viewed from the front. Mounting surface 53R has multiple screw holes 53A. Mounting surface 53L has multiple screw holes 53B. The base 21 is attached to mounting surface 53R by screwing screws into the screw holes 53A. The base 21 is attached to mounting surface 53L by screwing screws into the screw holes 53B.

[0028] The front end of the lower wall 51D has a projection 55. The projection 55 protrudes forward from the mounting surfaces 52R and 52L. The upper surface 55A of the projection 55 slopes downward as it extends forward. The frame cover 20 and the lower cover 85 are positioned above the upper surface 55A (see Figures 1 to 4).

[0029] The movable body 56 comprises a plate member 56A and sliding members 57R, 57L, 58R, and 58L. The plate member 56A is positioned at the lower end of the upright column 5.

[0030] The sliding members 57R and 57L are positioned at the front end of the plate member 56A. Sliding member 57R is positioned at the right front end of the plate member 56A. Sliding member 57L is positioned at the left front end of the plate member 56A. Sliding members 57R and 57L are aligned at the same position in the front-rear direction. In a plan view, a portion of the sliding members 57R and 57L is positioned in front of the mounting surfaces 52R and 52L (see Figure 8). In a bottom view, the sliding members 57R and 57L are rectangular boxes. Sliding member 57R is slidable in the front-rear direction guided by the right guide 25 of the pair of guides 25 (see Figure 5). Sliding member 57L is slidable in the front-rear direction guided by the left guide 25 of the pair of guides 25 (see Figure 5). Hereinafter, when sliding members 57R and 57L are not distinguished, they will be collectively referred to as sliding member 57. In a plan view, the sliding members 57R and 57L only need to be positioned forward of the mounting surfaces 52R and 52L in at least a portion of them, and may also be positioned entirely forward as shown in Figure 8.

[0031] The sliding members 58R and 58L (see Figure 8) are positioned at the rear end of the plate member 56A. Sliding member 58R is positioned at the right rear end of the plate member 56A. Sliding member 58L is positioned at the left rear end of the plate member 56A. Sliding members 58R and 58L are aligned at the same position in the front-rear direction. In a plan view, sliding members 58R and 58L are positioned behind the mounting surfaces 52R and 52L (see Figure 8). Sliding members 58R and 58L are rectangular boxes in a bottom view. Sliding member 58R is slidable in the front-rear direction guided by the right guide 25 of a pair of guides 25 (see Figure 5). Sliding member 58L is slidable in the front-rear direction guided by the left guide 25 of a pair of guides 25 (see Figure 5). Hereinafter, when sliding members 58R and 58L are not distinguished, they will be collectively referred to as sliding member 58.

[0032] Referring to Figures 1 to 5 and Figure 9, the operation of the machine tool 1 during workpiece machining 99 will be described. When the CPU of the control panel reads the feed command for the Z axis in the NC program, it drives the motor of the Z axis movement mechanism 12. The sliding members 57 and 58 slide forward guided by the pair of guides 25. The spindle 7 moves forward along the Z axis to a position where the workpiece 99 on the rotary table 9 and the tool 91 are in close proximity.

[0033] The CPU drives the spindle motor, rotating the spindle 7. In this state, the CPU drives the motors of the X-axis movement mechanism 11, the Z-axis movement mechanism 12, and the Y-axis movement mechanism 13 based on the commands of the NC program, moving the spindle 7 relative to the workpiece 99 to machine the workpiece 99.

[0034] When the spindle 7 moves vertically by the Y-axis movement mechanism 13, the lower cover 85 expands and contracts vertically in accordance with the height of the spindle head 6. When the spindle 7 is at the lower end within the vertical movement range (see Figures 2 and 4), the multiple metal plates of the lower cover 85 overlap in a state where they are inclined downwards as they move forward from the lower end of the spindle head 6. At the protrusion 55 located on the underside of the lower cover 85, the upper surface 55A is inclined downwards as it moves forward. Therefore, when the spindle 7 moves vertically by the Y-axis movement mechanism 13, the protrusion 55 does not interfere with the vertical expansion and contraction of the lower cover 85.

[0035] As shown in Figure 9(a), the sliding member 57 is positioned below the protrusion 55, with a portion of it positioned in front of the mounting surface 52. The column 60 shown in Figure 9(b) is a conventional column with a comparative structure. The column 60 comprises a mounting surface 72R, a movable body 76, a spindle head 6, and a frame cover 20. The movable body 76 comprises sliding members 77(77R, 77L) and 78(78R, 78L). The mounting surface 72R, movable body 76, sliding members 77(77R, 77L), and 78(78R, 78L) correspond to the mounting surface 52R, movable body 56, and sliding members 57(57R, 57L), and 58(58R, 58L) of the column 5 of the present invention, respectively. The column 60 differs from the column 5 of the present invention in that it does not have the protrusion 55 of the present invention, and the entire sliding member 77 is positioned behind the mounting surface 72R.

[0036] As shown in Figure 9(a), at the vertical column 5, the intersection point Q1 is the imaginary line connecting the sliding members 57R and 58L with the imaginary line connecting the sliding members 57L and 58R. As shown in Figure 9(b), at the vertical column 60, the intersection point Q2 is the imaginary line connecting the sliding members 77R and 78L with the imaginary line connecting the sliding members 77L and 78R. The distance L1 between intersection point Q1 and the front end of the tool 91 is shorter than the distance L2 between intersection point Q2 and the front end of the tool 91.

[0037] Here, when the machine tool 1 processes the workpiece 99, the vertical columns 5 and 60 may twist horizontally relative to the base 2 due to a reaction force from the workpiece 99. As the vertical columns 5 and 60 twist horizontally, the tool 91 also twists horizontally. The center of rotation of the twist when the entire vertical columns 5 and 60 twist horizontally is the intersection points Q1 and Q2 defined by the positional relationship of the sliding members 57, 58, 77, and 78. The displacement of the tool 91 due to twisting becomes smaller as the distances L1 and L2 between the intersection points Q1 and Q2 and the front end of the tool 91 decrease. Since distance L1 is shorter than distance L2, the displacement of the tool 91 due to twisting at vertical column 5 is smaller than the displacement of the tool 91 due to twisting at vertical column 60.

[0038] As described above, in the machine tool 1, the spindle head 6 extends in the Z-axis direction and is positioned in front of the column 5 by a Y-axis movement mechanism 13. The rotary table 9 is located in front of the spindle head 6. The spindle head 6 is movable in the Y-axis direction (up and down direction) guided by a pair of guides 24 attached to the mounting surfaces 52R and 52L of the column 5. Mounting surface 52R is located at the left front end of the right wall 51A. Mounting surface 52L is located at the right front end of the left wall 51B. The column 5 is movable in the Z-axis direction (forward and backward direction) with sliding members 57 and 58 guided by a pair of guides 25. In a plan view, a part of the sliding member 57 is located in front of the mounting surface 52. The distance L1 between the intersection Q1 on the column 5 and the front end of the tool 91 is shorter than the distance L2 between the intersection Q2 on the column 60 of a conventional structure and the front end of the tool 91. The displacement of the tool 91 due to twisting decreases as the distances L1 and L2 between the intersection points Q1 and Q2, which are the centers of rotation of the twist, and the front end of the tool 91 decrease. Since distance L1 is shorter than distance L2, the displacement of the tool 91 due to twisting in the vertical column 5 is smaller than the displacement of the tool 91 due to twisting in the vertical column 60 of the conventional structure. Therefore, the vertical column 5 can reduce the displacement due to twisting during the machining of the workpiece 99.

[0039] In a plan view, a portion of the sliding member 57 is positioned in front of the mounting surfaces 52R and 52L. In a plan view, the sliding member 58 is positioned behind the mounting surfaces 52R and 52L. In a plan view, the sliding members 57 and 58 are positioned with the mounting surfaces 52R and 52L between them in the front-rear direction. As a result, the sliding members 57 and 58 can guide the column 5 more stably compared to the case where both are positioned in front of the mounting surfaces 52R and 52L. Therefore, the column 5 can move stably in the front-rear direction.

[0040] The protruding portion 55 is located in front of the mounting surface 52. The upper surface 55A of the protruding portion 55 slopes downward as it extends forward. The lower cover 85 is positioned above the upper surface 55A. When the spindle 7 is at its lower end within its vertical movement range, the multiple metal plates of the lower cover 85 overlap, sloping downward as they extend forward from the lower end of the spindle head 6. Because the upper surface 55A of the protruding portion 55 slopes downward as it extends forward, the protruding portion 55 does not interfere with the vertical expansion and contraction of the lower cover 85 when the spindle 7 moves vertically by the Y-axis movement mechanism 13. Since the upper surface 55A of the protruding portion 55 slopes downward as it extends forward, it can support the column 5 without reducing its rigidity. Therefore, the column 5 can move stably in the front-rear direction.

[0041] The spindle 7 extends in the Z-axis direction (front-to-back direction). When the spindle 7 extends horizontally, the tool 91, which extends coaxially with the spindle 7, also twists horizontally when the vertical column 5 twists horizontally. Therefore, the torsional displacement at the front end of the tool 91 tends to be large. The rotation center of the twist when the entire vertical columns 5 and 60 twist horizontally is the intersection points Q1 and Q2 defined by the positional relationship of the sliding members 57, 58, 77, and 78. The displacement of the tool 91 due to twisting decreases as the distances L1 and L2 between the intersection points Q1 and Q2 and the front end of the tool 91 decrease. Since distance L1 is shorter than distance L2, the displacement of the tool 91 due to twisting in the vertical column 5 is smaller than the displacement of the tool 91 due to twisting in the vertical column 60 of a conventional structure. Therefore, even when the spindle 7 extends horizontally, the machine tool 1 can reduce the displacement due to twisting during machining of the workpiece 99.

[0042] In the above embodiment, base 2 is an example of the base of the present invention. Workpiece 99 is an example of a workpiece. Rotary table 9 is an example of the workbench of the present invention. Guide 24 is an example of the upper and lower guide portion of the present invention. The Z-axis direction (front and rear direction) is an example of the intersecting direction of the present invention. Sliding members 57 and 58 are examples of intersecting guide portions of the present invention. Sliding member 57 is an example of the first intersecting guide portion of the present invention. Sliding member 58 is an example of the second intersecting guide portion of the present invention.

[0043] The present invention is not limited to the embodiments described above and can be modified in various ways. The various modifications described below can be combined in any way as long as they do not create contradictions. For example, although the machine tool 1 in the above embodiment is a horizontal machine tool in which the spindle 7 extends horizontally, the present invention can also be applied to a vertical machine tool in which the spindle extends vertically.

[0044] In the vertical column 5, the positional relationship between the sliding members 57, 58 and the mounting surfaces 52R, 52L may be changed as follows: At least a portion of the sliding members 57R, 57L may be positioned in front of the mounting surfaces 52R, 52L, and a portion of the sliding members 57R, 57L may be positioned behind the mounting surfaces 52R, 52L. Both sliding members 57 and 58 may be positioned in front of the mounting surfaces 52R, 52L. In this case, the sliding members 57 and 58 may be positioned behind the rotary table 9. The sliding member 58 may be positioned in the center of the plate member 56A in the front-rear direction. In this case, the intersection Q1 is closer to the front end of the tool 91, and the distance L1 is shortened. Therefore, the vertical column 5 can further reduce the displacement due to the twisting of the tool 91.

[0045] The upper surface 55A of the protruding portion 55 does not have to be inclined downward and forward. For example, the upper surface 55A may be a horizontal surface.

[0046] The sliding members 57 and 58 can be configured to move along the pair of guides 25; for example, rollers that roll along the pair of guides 25 may be used instead of the sliding members 57 and 58.

[0047] The rotary table 9 may move in at least one of the X-axis, Y-axis, or Z-axis directions. The rotary table 9 may also rotate around the X-axis. [Explanation of symbols]

[0048] 1 Machine tools 5 standing pillars 7 Spindle 52R, 52L mounting surface 55 Protrusion 56 Mobile Unit 57, 58 Sliding member (crossing guide section)

Claims

1. In the upper part of the base of the machine tool, positioned at a distance from the workbench that holds the workpiece, and in the vertical column that supports the spindle head that holds the spindle, A mounting surface is provided on the surface facing the workbench for attaching an upper and lower guide that guides the vertical movement of the spindle head, The vertical column is integrally fixed to the lower wall forming the lower surface of the vertical column and comprises a sliding member that slides along a guide extending in a direction intersecting the vertical direction of the vertical column, and includes a crossing guide portion that guides the movement of the vertical column in the crossing direction, A vertical column characterized in that, in a plan view, at least a portion of the intersecting guide portion is located on the side of the mounting surface where the workbench is positioned.

2. The cross guide section comprises a first cross guide section and a second cross guide section positioned on the opposite side of the workbench from the first cross guide section. In a plan view, The upright column according to claim 1, characterized in that at least a portion of the first crossing guide portion is located on the side where the workbench is positioned, relative to the mounting surface.

3. The lower wall has a protruding portion that extends further toward the workbench than the mounting surface. The column according to claim 2, characterized in that the protruding portion is supported from below by the first crossing guide portion, and its upper end is inclined downward as it approaches the workbench side.

4. A machine tool characterized by comprising the vertical column described in claim 3.

5. The machine tool according to claim 4, characterized in that the main spindle extends in the horizontal direction.

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