Machine tool

Abstract

A machine tool has a base (2), a slide (3) supported so as to be linearly movable in one direction with respect to the base (2), a ball screw (8) that linearly moves the slide (3) with respect to the base (2), and a chain-like bracket (11) that wires a movable linear member between the base (2) and the slide (3). The bracket (11) is arranged in a U shape around an axis extending in a direction of separation between the base (2) and the slide (3), one end (11b) of the bracket (11) is fixed to the slide (3), the other end (11c) is fixed to the base (2), and a bent portion (11a) of the bracket (11) that is bent in a U shape is arranged at a position that crosses an extension line of an axis (X) of the ball screw (8).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a machine tool. BACKGROUND

[0002] Known is a cable holder that houses a movable cable or a movable pipe or the like movable wire member for supplying power or gas or the like to a device mounted on a slide of a linear motion mechanism (see, for example, Patent Literature 1). The cable holder is arranged in parallel with the moving direction of the slide in a space adjacent to the moving space of the slide, is bent into a U shape, and is used with one end fixed to a base and the other end fixed to the slide.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Publication No. 2003-244831 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] In a linear motion mechanism such as a worktable of a machine tool, in the case where a cable holder is bent into a U shape in the horizontal direction in order to reduce the height dimension, it is necessary to avoid interference between a ball screw for driving the slide and the cable holder. In this case, by arranging the cable holder adjacent to the lower side of the slide and arranging the ball screw below the cable holder, interference between the ball screw and the cable holder can be avoided.

[0008] However, in this structure, the force point at which power is applied to the slide is greatly distanced from the upper surface of the slide, and there is a case where vibration increases when the slide is accelerated or decelerated.

[0009] Therefore, it is desirable to effectively suppress vibration of the slide when the slide is accelerated or decelerated while reducing the height dimension of the linear motion mechanism of the machine tool.

[0010] SOLUTION TO THE PROBLEM

[0011] One aspect of the present disclosure is a machine tool including: a base; a slide supported so as to be able to move linearly in one direction with respect to the base; a ball screw that moves the slide linearly with respect to the base; and a chain-like holder that routes a movable wire member between the base and the slide, the holder being arranged between the base and the slide, bent into a U shape around an axis extending in the direction of separation between the base and the slide, one end of the holder being fixed to the slide and the other end being fixed to the base, the bent portion of the holder being arranged at a position that crosses an extension line of the axis of the ball screw.

[0012] With this structure, the height dimension of the space in which the direct acting mechanism is arranged can be suppressed, and vibration of the slide at acceleration and deceleration can be suppressed. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a partial cross-sectional side view of a machine tool of one embodiment of the present disclosure.

[0014] Figure 2 is a plan view of the machine tool of Figure 1 .

[0015] Figure 3 is a front view of a bed, a saddle, and a drive mechanism of the machine tool of Figure 1 .

[0016] Figure 4 is a side view showing a state in which a guide member of the machine tool of Figure 1 is fixed to a first support surface.

[0017] Figure 5 is a side view showing a state in which the guide member of the machine tool of Figure 1 is fixed to a second support surface.

[0018] Figure 6 is a plan view of the machine tool of Figure 5 .

[0019] Figure 7 is a front view illustrating a bent portion of a carriage of the machine tool.

[0020] Figure 8 is a partial cross-sectional side view showing a state in which the guide member is fixed to the support surface of the bed through one of the mounting surfaces in a modified example of the machine tool of Figure 1 .

[0021] Figure 9 is a partial cross-sectional side view showing a state in which the guide member is fixed to the support surface of the bed through the other of the mounting surfaces in the machine tool of Figure 8 .

[0022] REFERENCE NUMERALS:

[0023] 1 machine tool

[0024] 2 bed (base)

[0025] 3 saddle (slide)

[0026] 8 ball screw

[0027] 11 carriage

[0028] 11a bent portion

[0029] 11b one end

[0030] 11c other end

[0031] 13 guide member

[0032] 13a, 13b, 13c mounting surface

[0033] 14 support plane

[0034] 15 first support surface (support surface)

[0035] 16 second support surface (support surface)

[0036] 20 support surface

[0037] X-axis DETAILED DESCRIPTION

[0038] Hereinafter, a machine tool 1 of one embodiment of the present disclosure will be described with reference to the drawings.

[0039] As Figure 1 illustrated, the machine tool 1 of the present embodiment is provided with a bed (base) 2 provided on the ground, a saddle (slide member) 3 supported so as to be movable in one direction in the horizontal direction with respect to the bed 2, and a drive mechanism 4 that drives the saddle 3 with respect to the bed 2. A column 5 that supports a main shaft not illustrated is provided on the bed 2.

[0040] The drive mechanism 4 linearly moves the saddle 3 from a position close to the column 5 to a position separated from the column 5. As Figure 3 illustrated, the drive mechanism 4 is provided with two guide rails 6 that support the saddle 3 so as to be movable between two positions, and a ball screw 8 driven by a motor 7. The ball screw 8 and the guide rails 6 are disposed in an accommodation space adjacent to the lower side of the saddle 3 and extending in the horizontal direction. The guide rails 6 are disposed in parallel with each other at intervals in the horizontal direction, extending along the moving direction of the saddle 3.

[0041] In Figure 3 the example illustrated, the ball screw 8 is disposed in parallel with the guide rails 6 at the same height position as the guide rails 6, in the center of the two guide rails 6. One end of the ball screw 8 is connected to the motor 7. A support bracket 9 that supports the ball screw 8 so as to be rotatable about the axis X with respect to the bed 2 is provided at both ends of the ball screw 8.

[0042] A nut 10 is engaged with the ball screw 8. As Figure 3 illustrated, the nut 10 is fixed to the lower portion of the saddle 3. When the ball screw 8 is rotated by the action of the motor 7, the nut 10 engaged with the ball screw 8 moves in the length direction of the ball screw 8. Thus, the saddle 3 to which the nut 10 is fixed is driven in the length direction of the ball screw 8.

[0043] Therefore, asFigure 1 and Figure 2 As shown, the ball screw 8 is positioned over approximately the entire length of the travel range of the saddle 3.

[0044] In this embodiment, the motor 7, which is connected to one end of the ball screw 8, is located on one end of the bed 2, and the support bracket 9, which supports the other end of the ball screw 8, is located near the column 5.

[0045] Furthermore, the machine tool 1 of this embodiment includes a chain-like bracket 11, on which movable linear bodies 100, such as movable cables or movable tubes, are routed between the bed 2 and the saddle 3. The bracket 11 includes multiple units 12 connected in a manner that allows them to rotate about multiple parallel axes. The movable linear bodies 100 are arranged to be inserted into elongated internal spaces formed inside the connected multiple units 12.

[0046] In this embodiment, the bracket 11 is disposed within the same storage space Y as the ball screw 8 and the guide rail 6. Figure 2 As shown, one end 11b of the bracket 11, which extends parallel to the ball screw 8 in the space between one of the guide rails 6 and the ball screw 8, is fixed to the lower surface of the saddle 3.

[0047] Furthermore, the bracket 11 bends into a U-shape around the axis extending vertically in the direction between the bed 2 and the saddle 3. The bracket 11 then bends back at its U-shaped bend 11a, passing over the support bracket 9 on the other side of the ball screw 8, and is fixed to the bed 2 at the other end, which extends parallel to the ball screw 8, between the guide rail 6 and the ball screw 8.

[0048] That is, the U-shaped bend 11a of the bracket 11 is positioned at a location that crosses the extension line of the axis X of the ball screw 8. In addition, in order to move the saddle 3 to a position close to the column 5, the other end of the ball screw 8 extends to a position close to the column 5, so the bend 11a of the bracket 11 that bypasses the support bracket 9 at the other end is positioned in the space formed below the column 5.

[0049] like Figure 2 As shown, the other end 11c of the bracket 11 is fixed to the bed 2 via a guide member 13. The guide member 13 is a flat plate having a support plane 14, on which the unit 12 located at the far end of the other end 11c of the bracket 11 is fixed. The support plane 14 supports the lower surfaces of other units 12 connected to the far end unit 12 so that they can slide. In addition, the guide member 13 has a common mounting surface 13a, which mounts the guide member 13 onto a first support surface 15 and a second support surface 16 provided on the bed 2.

[0050] threaded holes (omitted from the drawing) are provided on the first support surface 15 and the second support surface 16 of the bed body 2, and a through hole (omitted from the drawing) is provided on the mounting surface 13a at a position coinciding with the threaded hole when the mounting surface 13a is disposed on the first support surface 15 or the second support surface 16. By fastening a bolt that penetrates the through hole to the threaded hole, the guide member 13 can be detachably fixed to the first support surface 15 or the second support surface 16.

[0051] As shown in Figure 4 , the first support surface 15 can fix the bracket 11, whose curved portion 11a is disposed at a position on the extension line of the axis X of the ball screw 8, to the bed body 2.

[0052] The second support surface 16 is disposed closer to the motor 7 side than the first support surface 15 in the moving direction of the saddle 3, and is disposed at a position higher than the first support surface 15. When the guide member 13 fixed to the first support surface 15 is removed and fixed to the second support surface 16, as shown in Figure 5 and Figure 6 , the other end portion 11c of the bracket 11 is moved to the motor 7 side, and is pulled up in the upward direction.

[0053] Thus, as shown in Figure 5 and Figure 7 , the other end 11c side of the bracket 11 fixed to the bed body 2 is disposed at a position higher than the one end 11b side fixed to the saddle 3, and the curved portion 11a connecting therebetween is tilted up from the one end 11b side to the other end 11c side. That is, by removing the guide member 13 from the first support surface 15 and fixing it to the second support surface 16, the curved portion 11a of the bracket 11 disposed in the space below the column 5 can be pulled out from below the column 5 and disposed at a position on the ball screw 8.

[0054] Next, the operation of the machine tool 1 of the present embodiment configured in this manner will be described.

[0055] According to the machine tool 1 of the present embodiment, when the ball screw 8 is rotated by the action of the motor 7, the nut 10 engaged with the ball screw 8 moves along the axis X of the ball screw 8, and the saddle 3 on which the nut 10 is fixed can be caused to move along the axis X direction of the ball screw 8.

[0056] Since the one end 11b of the bracket 11 is fixed to the saddle 3, the one end 11b of the bracket 11 moves in correspondence with the movement of the saddle 3, as a result of which the bracket 11 changes the position of the curved portion 11a, thereby disposing the movable wire member 100 inserted in the interior on the prescribed wiring path while protecting the movable wire member 100.

[0057] When the machine tool 1 is operated, the guide member 13 of the other end 11c of the fixed bracket 11 is fixed to the first support surface 15 of the bed 2.

[0058] Thus, the bent portion 11a of the bracket 11 can be arranged at a position on an extension line of the axis X of the ball screw 8, and the height dimension of the housing space Y in which the ball screw 8 and the bracket 11 are arranged can be suppressed.

[0059] That is, it has an advantage that the ball screw 8 can be arranged close to the saddle 3, the force point of the driving force input from the ball screw 8 to the saddle 3 can be made close to the saddle 3, the rigidity of the saddle 3 can be improved, and the vibration of the saddle 3 at the time of acceleration and deceleration can be suppressed.

[0060] In addition, in the present embodiment, in order to arrange the ball screw 8 and the bracket 11 at the same height position, the bent portion 11a of the bracket 11 is arranged in a space below the column 5 in which the ball screw 8 is not arranged. Thus, as shown in Figure 2 in a state where the guide member 13 is fixed to the first support surface 15, it is difficult to maintain the movable wire bar 100 inside the bracket 11.

[0061] Therefore, in the present embodiment, at the time of maintenance of the movable wire bar 100 or the like, after the saddle 3 is moved to a position farthest from the column 5, the guide member 13 is removed from the first support surface 15 and is fixed to the second support surface 16 as shown in Figure 6 In order to fix the guide member 13 to the second support surface 16 arranged on the motor 7 side and on the upper side than the first support surface 15, the other end 11c of the bracket 11 fixed to the guide member 13 is raised while moving to the motor 7 side.

[0062] Thus, the bent portion 11a of the bracket 11 housed in the space below the column 5 can be pulled out from the space below the column 5 to the outside, and can be placed on the ball screw 8. That is, it has an advantage that the entire bracket 11 can be exposed to the outside of the column 5, and the movable wire bar 100 inside the bracket 11 can be easily accessed to perform maintenance work such as replacement of the movable wire bar 100.

[0063] Further, in the present embodiment, the first support surface 15 and the second support surface 16 different in position and height in the moving direction of the saddle 3 are provided on the bed 2, and the position of the common mounting surface 13a on which the guide member 13 is mounted is switched from the first support surface 15 to the second support surface 16. Instead, as shown in Figure 8 and Figure 9 two mounting surfaces 13b, 13c different in position and height in the moving direction of the saddle 3 are provided on the guide member 13, and are selectively mounted on one support surface 20 provided on the bed 2,

[0064] Further, in the machine tool 1 of the present embodiment, a case where the saddle 3 is moved in the horizontal direction is exemplified, but the present application is not limited thereto, and can be applied to a case where the saddle 3 is moved in the vertical direction or the like.

Claims

1. A machine tool, characterized by Possessing: a base; a slide supported so as to be able to move linearly in one direction with respect to the base; a ball screw that linearly moves the slide with respect to the base; and a chain-like bracket that routes a movable wire body between the base and the slide, the bracket is arranged in a U-shape around an axis extending in a direction of separation between the base and the slide, one end of the bracket is fixed to the slide and the other end is fixed to the base, a bent portion of the bracket that is bent into a U-shape is arranged at a position that crosses an extension line of an axis of the ball screw, the slide is supported so as to be able to move in a horizontal direction, the machine tool possesses a guide member that fixes the other end of the bracket, the guide member possesses a horizontal support surface that supports a lower surface of the bracket that moves in correspondence with movement of the slide, and the guide member is detachably mountable to the base at either of a first position or a second position, the first position being a position that arranges the bent portion at a position that crosses the extension line of the axis of the ball screw, and the second position being a position that arranges the bent portion at a position that crosses above the ball screw.

2. The machine tool according to claim 1, wherein the base possesses a support surface that detachably fixes the guide member, the guide member has two mounting surfaces, and by fixing the two mounting surfaces to the support surface selectively, the guide member is able to be arranged at either the first position or the second position.

3. The machine tool according to claim 1, wherein the base possesses two support surfaces that detachably fix the guide member, the guide member has a mounting surface, and by fixing the mounting surface to either of the support surfaces, the guide member is able to be arranged at either the first position or the second position. ​

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