Machine tool

Abstract

To provide a machine tool capable of processing a desired portion of a workpiece.SOLUTION: A machine tool includes: a spindle head which holds a spindle; a holding part which is disposed below the spindle head and holds a workpiece; a first movement mechanism which moves the holding part or the spindle head in a direction intersecting a vertical direction; a support part which is disposed below the spindle head to support the workpiece held by the holding part; and a second movement mechanism which moves the support part in the vertical direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present technology relates to a machine tool that processes a workpiece. [Background technology]

[0002] BACKGROUND ART There are machine tools that machine a workpiece by moving a table or a spindle head that holds the workpiece (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2021-146469 Summary of the Invention [Problem to be solved by the invention]

[0004] If the workpiece is long, there is a risk that parts of the workpiece that are beyond the range of movement of the table or spindle head cannot be machined.

[0005] The present disclosure has been made in consideration of the above circumstances, and aims to provide a machine tool that can machine a desired portion of a workpiece. [Means for solving the problem]

[0006] A machine tool according to one embodiment of the present disclosure includes a spindle head that holds a spindle, a holding section that is arranged below the spindle head and that holds a workpiece, a first movement mechanism that moves the holding section or the spindle head in a direction that intersects the vertical direction, a support section that is arranged below the spindle head and that supports the workpiece held by the holding section, and a second movement mechanism that moves the support section in the vertical direction.

[0007] In the present disclosure, when machining a portion of the workpiece that is beyond the range of movement of the holding part or spindle head, the workpiece is moved upward by the support part and second moving mechanism, the holding part or spindle head is moved in a direction that intersects the vertical direction by the first moving mechanism, the workpiece is moved downward by the support part and second moving mechanism, and the holding part holds the workpiece in a position where it can be machined by the tool.

[0008] A machine tool according to one embodiment of the present disclosure switches the position of the support part to a support position for supporting the workpiece without processing the workpiece, or to a processing position for processing the workpiece without supporting the workpiece.

[0009] In the present disclosure, when the workpiece is moved to a position where it can be machined by a tool, the attitude of the support part is the support position, and when machining the workpiece, the position of the support part is the machining position. The support part at the machining position does not interfere with machining of the workpiece.

[0010] In a machine tool according to one embodiment of the present disclosure, the support part has an arm that engages with the workpiece and an arm support part that supports the arm and is rotatable around an up-down axis, and the position of the support part is switched between the support position and the machining position by rotating the arm support part.

[0011] In the present disclosure, the position of the support part is switched between the support position and the processing position by rotating the arm support part.

[0012] In a machine tool according to one embodiment of the present disclosure, the arm extends horizontally, is longer than the dimensions of the workpiece, and includes a receiving portion for receiving the workpiece.

[0013] In the present disclosure, the receiving portion supports the entire workpiece, making it difficult for the workpiece to fall off the receiving portion.

[0014] In the machine tool according to one embodiment of the present disclosure, the tip portion of the receiving portion protrudes upward.

[0015] In the present disclosure, when the workpiece supported by the receiving portion moves, the tip portion of the receiving portion can prevent the workpiece from moving.

[0016] In a machine tool according to one embodiment of the present disclosure, the support portion is provided on the spindle head, and the second movement mechanism is a mechanism that moves the spindle head in the vertical direction.

[0017] In the present disclosure, the mechanism that moves the spindle head in the vertical direction is the second movement mechanism, so there is no need to provide a new mechanism that moves the support part in the vertical direction. [Effects of the Invention]

[0018] In a machine tool according to an embodiment of the present disclosure, when machining a portion of a workpiece that exceeds the movable range of the holder or spindle head, the support and second movement mechanism move the workpiece upward, the first movement mechanism moves the holder or spindle head in a direction that intersects the up-down direction, the support and second movement mechanism move the workpiece downward, and the holder holds the workpiece in a position where it can be machined with a tool, allowing the machine tool to machine the desired portion of the workpiece. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 2 is a schematic perspective view of the machine tool, in which the support portion is positioned at a machining position. [Figure 2] FIG. 1 is a schematic perspective view of a machine tool in which a support portion is positioned at a support position. [Figure 3] FIG. 1 is an explanatory diagram illustrating drilling of a workpiece. [Figure 4] FIG. 1 is an explanatory diagram illustrating drilling of a workpiece. [Figure 5] FIG. 1 is an explanatory diagram illustrating drilling of a workpiece. [Figure 6] FIG. 1 is an explanatory diagram illustrating drilling of a workpiece. [Figure 7] FIG. 1 is an explanatory diagram illustrating drilling of a workpiece. [Figure 8]FIG. 1 is an explanatory diagram illustrating drilling of a workpiece. [Figure 9] FIG. 1 is an explanatory diagram illustrating drilling of a workpiece. [Figure 10] FIG. 1 is an explanatory diagram illustrating drilling of a workpiece. [Figure 11] FIG. 1 is an explanatory diagram illustrating drilling of a workpiece. [Figure 12] FIG. 1 is an explanatory diagram illustrating drilling of a workpiece. [Figure 13] FIG. 1 is an explanatory diagram illustrating drilling of a workpiece. [Figure 14] FIG. 1 is an explanatory diagram illustrating drilling of a workpiece. [Figure 15] FIG. 1 is an explanatory diagram illustrating drilling of a workpiece. [Figure 16] FIG. 1 is an explanatory diagram illustrating drilling of a workpiece. [Figure 17] FIG. 1 is an explanatory diagram illustrating drilling of a workpiece. [Figure 18] FIG. 1 is an explanatory diagram illustrating drilling of a workpiece. [Figure 19] FIG. 1 is an explanatory diagram illustrating drilling of a workpiece. DETAILED DESCRIPTION OF THE INVENTION

[0020] The present invention will be described below with reference to the drawings showing a machine tool according to an embodiment. Figure 1 is a schematic perspective view of the machine tool in which the support part is positioned at the machining position, and Figure 2 is a schematic perspective view of the machine tool in which the support part is positioned at the support position. In the following description, up, down, left, right, front and back directions will be used as indicated by arrows in the figures.

[0021] As shown in Figures 1 and 2, the machine tool has a rectangular base 1 that is long from front to back. A pillar 2 is fixed to the rear of the base 1. The machine tool has, at the front of the base 1, a Y-direction moving unit 11 that moves in the front-to-back direction, an X-direction moving unit 12 that moves in the left-to-right direction, a base 13, and multiple legs 13a. The Y-direction moving unit 11 has a Y-axis motor (not shown), and is moved back and forth by the drive of the Y-axis motor. The X-direction moving unit 12 has an X-axis motor (not shown), and is moved left and right by the X-axis motor. The Y-direction moving unit 11 and the X-direction moving unit 12 constitute a first moving mechanism.

[0022] The Y-direction moving unit 11 is provided on the base 1, and the X-direction moving unit 12 is provided on the Y-direction moving unit 11. The platform 13 is provided on the X-direction moving unit 12. A plurality of legs 13a are provided on the upper surface of the platform 13. The legs 13a are shaped like a rectangular parallelepiped extending in the front-to-rear direction. The multiple legs 13a are lined up in the left-to-right direction at approximately equal intervals from each other. The legs 13a hold a workpiece 15. The platform 13 and the legs 13a form a holder that holds the workpiece 15. The left-to-right and front-to-back movements of the X-direction moving unit 12 and the Y-direction moving unit 11 determine the left-to-right and front-to-back positions of the workpiece 15 fixed to the legs 13a.

[0023] A Z-direction moving unit 14 is provided on the front surface of the upright pillar 2. The Z-direction moving unit 14 comprises two tracks (not shown), a slider (not shown), and a ball screw mechanism (not shown). The two tracks extend vertically and are provided on both the left and right sides of the front surface of the upright pillar 2. A slider is provided on each track and moves along the tracks. The ball screw mechanism is disposed between the two tracks. The ball screw mechanism comprises a ball screw and a nut that extend vertically.

[0024] The spindle head 3, which is movable in the vertical direction, is mounted on the front surface of the upright column 2 above the base 13 via the Z-direction moving unit 14. The spindle head 3 rotatably holds the spindle 3a. The axial direction of the spindle 3a is the vertical direction, and it rotates around its axis. The spindle head 3 is connected to a nut and slider of the Z-direction moving unit 14. A Z-axis motor (not shown) is mounted on the upright column 2, and the ball screw is rotated by the drive of the Z-axis motor, causing the spindle head 3 to move up and down. The Z-direction moving unit 14 constitutes a second movement mechanism.

[0025] The spindle motor 8 is provided at the upper end of the spindle head 3, and the spindle 3a rotates when driven by the spindle motor 8. Two support plates 7 protrude forward from the upright 2 and are aligned on the left and right. Note that Figures 1 and 2 only show the right support plate 7. The support plate 7 supports a tool magazine 6, which has multiple pots that hold tools 5 (see Figure 3, etc., described below). Driven by a magazine motor (not shown), the tool magazine 6 rotates and sends a specific tool 5 to the lowest position, i.e., the replacement position. A control panel 9 is provided on the rear of the upright 2. The control panel 9 includes a control unit such as an FPGA or CPU, RAM, EEPROM, etc. The EEPROM stores a control program (program product). The control panel 9 reads the control program into RAM and controls the drive of each motor, etc. Note that the control panel 9 may be connected to an external server so that it can communicate with it. In this case, the control program may be stored in the memory unit of the external server, and the external server may control the driving of each motor, etc. based on the control program, or the external server and the control panel 9 may perform distributed processing of the driving of each motor, etc. based on the control program.

[0026] A support unit 20 is disposed below the spindle head 3 for supporting the workpiece 15 held by the legs 13a. The support unit 20 is disposed above the table 13. Because it is disposed above the table 13, chips are less likely to adhere to the support unit 20 during machining of the workpiece 15. The support unit 20 includes a drive unit 21, a turntable 22, and two arms 23. The drive unit 21 and the turntable 22 form an arm support unit. The drive unit 21 is fixed to the underside of the spindle head 3. The drive unit 21 has an output shaft (not shown). The output shaft extends vertically and rotates around its axis. The turntable 22 has a disk with its rotation axis extending vertically, and the rotation center of the disk is connected to the output shaft. Note that instead of a disk, a polygonal turntable 22 may be used for the support unit 20. The axis of the turntable 22 is approximately parallel to the spindle 3a.

[0027] The drive unit 21 includes, for example, a cylinder, a piston, and a conversion mechanism. By supplying a high-pressure fluid, such as a gas or liquid, to the cylinder, the conversion mechanism converts the linear motion of the piston within the cylinder into rotational motion of the output shaft. For example, when high-pressure fluid is supplied to one end of the cylinder, the output shaft rotates clockwise in a plan view, and when high-pressure fluid is supplied to the other end of the cylinder, the output shaft rotates counterclockwise in a plan view. The clockwise and counterclockwise rotation of the output shaft switches the position of the support unit 20 between a support position for supporting the workpiece 15 (see FIG. 2) and a machining position for machining the workpiece 15 without supporting the workpiece 15 (see FIG. 1). The drive unit 21 may include a motor instead of the cylinder, piston, etc., and the output shaft may be rotated by the rotation of the motor. The control panel 9 controls the drive unit 21. An operator may control each motor and the drive unit 21 by operating an operation unit such as a touch panel, switch, dial, or keyboard.

[0028] Two arms 23 are connected to the turntable 22. The two arms 23 are provided on the left and right sides of the turntable 22. The arms 23 include a protruding portion 23a, a hanging portion 23b, and a receiving portion 23c. The protruding portion 23a is plate-shaped and extends in a direction perpendicular to the up-down direction, i.e., in the horizontal direction, and protrudes from the turntable 22 along the radial direction of the turntable 22. The protruding direction of the protruding portion 23a of one arm 23 is 180 degrees opposite to the protruding direction of the protruding portion 23a of the other arm 23.

[0029] Hanging portion 23b is plate-shaped and extends vertically and in the protruding direction of protruding portion 23a, and extends downward from the protruding end of protruding portion 23a. Receiving portion 23c is plate-shaped and extends horizontally, and extends from the lower end of hanging portion 23b at a substantially right angle to hanging portion 23b. Tip portion 23d of receiving portion 23c protrudes upward. Receiving portions 23c of each arm 23 extend in the same direction. As described above, the protruding directions of each protruding portion 23a are 180 degrees opposite to each other, so each receiving portion 23c is spaced a predetermined distance apart in the radial direction of turntable 22.

[0030] As shown in FIG. 1, in the processing position, one protrusion 23a extends to the right and the other protrusion 23a extends to the left, each hanging portion 23b is located at the front edge of the protrusion 23a, and each receiving portion 23c extends to the rear.

[0031] 2, at the support position, one protrusion 23a extends to the right, the other protrusion 23a extends to the left, each hanging portion 23b is located at the rear edge of protrusion 23a, and each receiving portion 23c extends to the front. Note that since support portion 20 rotates 180 degrees, one protrusion 23a at the support position is the other protrusion 23a at the processing position, and the other protrusion 23a at the support position is one protrusion 23a at the processing position.

[0032] 3 to 19 are explanatory diagrams illustrating the drilling process on the workpiece 15. In the following description, as necessary, when the arm 23 is positioned so that the receiving portion 23c extends forward, the arm 23 is referred to as facing forward, or the position of the support portion 20 is referred to as the support position, and when the arm 23 is positioned so that the receiving portion 23c extends rearward, the arm 23 is referred to as facing rearward, or the position of the support portion 20 is referred to as the machining position. The tool magazine 6 is provided with empty pots.

[0033] As shown in FIG. 3, in the initial state, the arm 23 faces rearward. That is, the support unit 20 is positioned at the machining position. The tip 23d of the receiving unit 23c is positioned rearward of the table 13. The tool 5 is attached to the spindle 3a. As shown in FIG. 4, in the initial state, the X-direction moving unit 12 is positioned at the rightmost position within its movable range, and the table 13 is also positioned at the rightmost position within its movable range. The workpiece 15 has, for example, a rectangular plate shape and is placed on each leg 13a with its long sides extending left and right and its short sides extending front to back. The underside of the workpiece 15 forms a support surface supported by the receiving unit 23c. The front to back dimension of the receiving unit 23c is longer than the front to back dimension of the support surface of the workpiece 15, i.e., the short side of the support surface. The workpiece 15 is placed on multiple legs 13a so that it is supported by the rightmost leg 13a. That is, the workpiece 15 is placed as far right as possible on the table 13. The table 13 is also positioned so that the left end of the workpiece 15 is located below the tool 5 .

[0034] That is, the worker prepares a workpiece 15 whose short side length on the bottom surface (support surface) is shorter than the front-to-rear dimension of the receiving portion 23c, and places it on the multiple legs 13a. The worker places the workpiece 15 on the multiple legs 13a so that it is supported by the rightmost leg 13a. That is, the worker places the workpiece 15 as far to the right as possible on the table 13. The worker positions the table 13 so that the left end of the workpiece 15 is located under the tool 5. Then, processing of the workpiece 15, for example, the drilling process described below, begins.

[0035] As shown in Fig. 5, the spindle head 3 is lowered by the lowering of the Z-direction moving unit 14, and the tool 5 drills a hole in the workpiece 15. As shown in Fig. 6, after drilling, the spindle head 3 is raised. As shown by the arrow in Fig. 6, the X-direction moving unit 12 moves a predetermined distance to the left, and the spindle head 3 is lowered again by the lowering of the Z-direction moving unit 14, and the tool 5 drills a hole in the workpiece 15. In this way, the machine tool repeats the lowering and raising of the spindle head 3 and the movement of the X-direction moving unit 12 a predetermined distance to the left until the X-direction moving unit 12 is positioned at the leftmost position within its movable range, sequentially drilling holes in the workpiece 15.

[0036] When the X-direction moving unit 12 is positioned at the leftmost position, the table 13 cannot move any further to the left. The right side of the workpiece 15 has a portion that has not been drilled, i.e., an unmachined portion. Therefore, the machine tool raises and supports the workpiece 15 using the support unit 20, moves the table 13 to the right, and places the workpiece 15 on the table 13. Specifically, the following operations are performed.

[0037] 7, the spindle head 3 rises as the Z-direction moving part 14 rises, and the tool magazine 6 receives and stores the tool 5 from the spindle 3a. The tool magazine 6 rotates a predetermined distance so that the empty pot is located at the lowest position of the tool magazine 6, i.e., the replacement position, and the tool 5 is located at a position away from the replacement position (see FIG. 11).

[0038] As shown by the arrow in FIG. 8, the support part 20 rotates when driven by the drive part 21, and the arm 23 faces forward. That is, the position of the support part 20 is the support position. The tip part 23d of the receiving part 23c is located above the rear part of the base 13 and is located rearward of the leg 13a. As shown by the downward arrow in FIG. 9, the spindle head 3 descends when the Z-direction moving part 14 descends. As shown by the backward arrow in FIG. 9, the Y-direction moving part 11 moves rearward and the base 13 moves rearward. When the receiving part 23c is located between the base 13 and the workpiece 15 in the vertical direction, the Z-direction moving part 14 stops, and the spindle head 3 stops.

[0039] When the spindle head 3 is stopped, each receiving portion 23c is located between multiple legs 13a in the left-right direction. For example, when the first to third legs 13a are lined up in order from left to right, one receiving portion 23c is located between the first and second legs 13a, and the other receiving portion 23c is located between the second and third legs 13a. When the first to fourth legs 13a are lined up from left to right, one receiving portion 23c may be located between the first and second legs 13a, and the other receiving portion 23c may be located between the third and fourth legs 13a.

[0040] As shown by the arrows in Figure 10, the Y-direction moving unit 11 moves further rearward, and the platform 13 moves rearward. As shown in Figures 10 and 11, each receiving portion 23c is inserted between two adjacent legs 13a. The Y-direction moving unit 11 stops. The receiving portion 23c is positioned below the workpiece 15. The tip portion 23d of the receiving portion 23c is positioned in front of the workpiece 15, and the connecting portion of the receiving portion 23c with the hanging portion 23b is positioned rearward of the workpiece 15. In the front-rear direction, the workpiece 15 is positioned between the tip portion 23d of the receiving portion 23c and the connecting portion of the receiving portion 23c with the hanging portion 23b. In other words, in the front-rear direction, each receiving portion 23c supports the entire support surface of the workpiece 15.

[0041] As shown in Figures 12 and 13, as the Z-direction moving unit 14 rises, the spindle head 3 rises, each receiving portion 23c supports the workpiece 15, and the workpiece 15 moves upward and away from the legs 13a. In the front-to-rear direction, each receiving portion 23c supports the entire support surface of the workpiece 15, so the workpiece 15 is stable and is less likely to fall from the receiving portion 23c. In addition, because the tip portion 23d of each receiving portion 23c protrudes upward, even if the workpiece 15 moves forward due to vibration, for example, the movement of the workpiece 15 is blocked, preventing it from falling. The Z-direction moving unit 14 stops, and the spindle head 3 stops.

[0042] As described above, an empty pot is located at the replacement position, and the tool 5 is located at a position away from the replacement position, so that when the workpiece 15 is raised, it is possible to prevent the workpiece 15 from interfering with the tool 5. The position away from the replacement position is a position where the raised workpiece 15 will not interfere, for example, a position above the raised workpiece 15. Note that the tool 5 may be at the replacement position as long as the workpiece 15 does not interfere with the tool 5.

[0043] As shown by the arrows in FIG. 14, the X-direction moving unit 12 moves to the right, and the table 13 moves to the right. For example, the table 13 moves to the right until the left end of the workpiece 15 is positioned on the leftmost leg 13a, and then stops. At this time, each receiving portion 23c is positioned between two adjacent legs 13a in the left-right direction. As shown by the arrows in FIG. 15, the Z-direction moving unit 14 descends, causing the spindle head 3 to descend until the legs 13a support the workpiece 15. As shown by the arrows in FIG. 16, the Y-direction moving unit 11 moves forward until each receiving portion 23c is completely removed from between the legs 13a.

[0044] At this time, for example, the workpiece 15 is placed on the legs 13a so that it is supported by the leftmost leg 13a. That is, the workpiece 15 is placed on the table 13 as far to the left as possible.

[0045] As shown by the arrows in Figure 17, when the Z-direction moving unit 14 rises, the spindle head 3 rises a predetermined distance, and the support unit 20 also rises a predetermined distance. As shown by the arrows in Figure 18, when the drive unit 21 is driven, the support unit 20 rotates, and the arm 23 faces rearward. That is, the position of the support unit 20 is the machining position.

[0046] The tool magazine 6 rotates and sends the tool 5 to the replacement position. The Z-direction moving unit 14 lowers the spindle head 3, and the spindle 3a loads the tool 5. The X-direction moving unit 12 moves left or right as needed so that the left end of the unmachined portion of the workpiece 15 is positioned under the tool 5. The Z-direction moving unit 14 lowers the spindle head 3, and the tool 5 drills a hole in the unmachined portion of the workpiece 15. As shown in Figure 19, after drilling, the spindle head 3 rises. As shown by the arrow in Figure 19, the X-direction moving unit 12 moves a predetermined distance to the left, and the Z-direction moving unit 14 lowers the spindle head 3 again, and the tool 5 drills a hole in the unmachined portion of the workpiece 15. In this way, the machine tool repeats the lowering and raising of the spindle head 3 and the movement of the X-direction moving unit 12 a predetermined distance to the left until drilling of the entire unmachined portion of the workpiece 15 is completed.

[0047] In the machine tool according to the embodiment, when machining a portion of the workpiece 15 that is beyond the movable range of the table 13 and legs 13a, the workpiece 15 is moved upward by the support unit 20 and Z-direction moving unit 14, moved left and right by the X-direction moving unit 12, and moved downward by the support unit 20 and Z-direction moving unit 14, and the table 13 and legs 13a hold the workpiece 15 in a position where it can be machined by the tool 5. Therefore, the machine tool can machine the desired portion of the workpiece 15.

[0048] Furthermore, when the workpiece 15 is moved to a position where it can be machined by the tool 5, the position of the support part 20 becomes the support position, and when machining the workpiece 15, the position of the support part 20 becomes the machining position. The support part 20 at the machining position does not interfere with machining of the workpiece.

[0049] Furthermore, the position of the support part 20 is switched between the support position and the machining position by the rotation of the support part 20. Furthermore, since the support part 20 is moved up and down by the Z-direction moving part 14 which moves the spindle head 3 up and down, there is no need to provide a new mechanism for moving the support part 20 up and down.

[0050] Although the machine tool uses the X-direction moving unit 12 to move the workpiece 15 left and right to perform the drilling process, the Y-direction moving unit 11 may also move the workpiece 15 forward and backward to perform the drilling process. In this case, the Y-direction moving unit 11 constitutes a first moving mechanism. For example, in the initial state, the Y-direction moving unit 11 is positioned at the frontmost position within its movable range, and the table 13 is also positioned at the frontmost position within its movable range. The workpiece 15 is moved rearward, and holes are drilled sequentially from the rear end of the workpiece 15 to the front until the Y-direction moving unit 11 reaches the rearmost position within its movable range. When the Y-direction moving unit 11 is positioned at the rearmost position, the table 13 cannot move rearward any further. The front portion of the workpiece 15 has a portion that has not been drilled, i.e., an unmachined portion. Therefore, the machine tool raises and supports the workpiece 15 using the support unit 20, moves the table 13 forward, places the workpiece 15 on the table 13, and moves the workpiece 15 rearward to drill holes sequentially in the unmachined portions. The machine tool performs the hole drilling process within a range where the workpiece 15 does not interfere with components such as the upright pillar 2 during the process.

[0051] Furthermore, the support portion 20 is provided on the underside of the spindle head 3, but it is also possible to provide a mounting portion extending downward on the underside of the spindle head 3, and to mount the support portion 20 below or in front of this mounting portion.

[0052] Furthermore, the support part 20 is raised or lowered by the Z-direction moving unit 14, but a vertical moving mechanism separate from the Z-direction moving unit 14 may be provided, and the support part 20 may be raised or lowered by this moving mechanism. For example, the machine tool may be provided with a moving mechanism that can move between the inside of the spindle head 3 and the space below the spindle head 3. In this case, the support part 20 is housed inside the spindle head 3 during machining, and is arranged in the space below the spindle head 3 when supporting the workpiece 15. Therefore, the spindle head 3 can carry the support part 20 out only when supporting the workpiece 15. The position of the support part 20 housed inside the spindle head 3 is included in the machining position. The position of the support part 20 arranged in the space below the spindle head 3 is included in the support position.

[0053] Alternatively, the base 13 may be fixed, and the spindle head 3 may move up and down, back and forth, and left and right. In this case, the support unit 20 moves the workpiece 15, and then the spindle head 3 moves to the desired part of the workpiece 15. For example, when machining the right part of the workpiece 15, the spindle head 3 and support unit 20 lift the workpiece 15, move it to the left, and place it on the base 13. After that, the spindle head 3 and support unit 20 move to the right until the spindle 3a is positioned above the left end of the right part of the workpiece 15.

[0054] The invention according to the embodiment may be applied to a horizontal machine tool in which the spindle 3a extends horizontally (front-back or left-right).The invention according to the embodiment may also be applied to machining other than drilling, such as cutting or deburring.

[0055] The embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present invention is intended to include all modifications within the scope of the claims and the scope equivalent to the claims. The features described in each embodiment can be mutually combined. Furthermore, independent claims and dependent claims described in the claims can be mutually combined in any and all combinations, regardless of the reference format. Furthermore, although the claims use a format in which a claim references two or more other claims (multiple claim format), this is not limiting. A multiple claim (multi-multi claim) that references at least one other multiple claim may also be used. [Explanation of symbols]

[0056] 2 standing pillars 3 Spindle head 3a main shaft 11 Y-direction moving unit (first moving mechanism) 12 X direction moving part (first moving mechanism) 13 units (holding part) 13a Leg (holding part) 14 Z direction moving part (second moving mechanism) 20 Support part 21 Drive unit (arm support unit) 22 Turntable (arm support) 23 Arm

Claims

1. a spindle head for holding the spindle; a holder disposed below the spindle head and configured to hold a workpiece; a first movement mechanism that moves the holding unit or the spindle head in a direction intersecting the up-down direction; a support portion disposed below the spindle head for supporting the workpiece held by the holder; a second movement mechanism that moves the support part in the vertical direction; A machine tool equipped with:

2. The machine tool according to claim 1 , wherein the position of the support part is switched to a support position for supporting the workpiece without machining the workpiece, or a machining position for machining the workpiece without supporting the workpiece.

3. the support portion has an arm that engages with the workpiece and an arm support portion that supports the arm and is rotatable around a vertical axis, The position of the support part is switched between the support position and the processing position by rotating the arm support part. The machine tool according to claim 2.

4. The arm extends horizontally, is longer than the size of the workpiece, and has a receiving portion for receiving the workpiece. The machine tool according to claim 3.

5. The tip of the receiving portion protrudes upward. The machine tool according to claim 4.

6. the support portion is provided on the spindle head, The second movement mechanism is a mechanism for moving the spindle head in the vertical direction.

6. A machine tool according to any one of claims 1 to 5.

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