Machine tool

Abstract

To provide a machine tool adding a position setting function in a rotation axis direction of a main spindle to a machine in which a tool rest is not provided movably in the rotation axis direction of the main spindle.SOLUTION: A machine tool includes a spindle unit for holding and rotating a workpiece, a first cutter holder for fixing a cutter for machining the workpiece, and a second cutter holder which moves independently of the first cutter holder and fixes the cutter for machining the workpiece. The cutter fixed to the first cutter holder and the cutter fixed to the second cutter holder can simultaneously machine the workpiece. At least one of the first cutter holder and the second cutter holder is disposed so as to be movable in a first direction intersecting a rotation axis direction of the spindle unit. The first cutter holder includes a cutter holder body, a slider 42 for fixing the cutter, and a position adjustment part 44 for manually moving, adjusting and fixing the position of the slider 42 in the rotation axis direction with respect to the cutter holder body.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a machine tool. [Background technology]

[0002] 2. Description of the Related Art Machine tools are known that have a spindle that holds and rotates a workpiece, and a cutting tool that processes the workpiece held by the spindle.

[0003] The machine tool described in Patent Document 1 includes a main spindle supported so as to be movable in the direction of its rotation axis, and two gang tool rests arranged opposite each other across the rotation axis of the main spindle. Each of the two gang tool rests is supported so as to be movable in the X and Y directions perpendicular to the direction of the rotation axis of the main spindle, and one of the two gang tool rests is provided so as to be movable in the Z direction, which is the same direction as the direction of the rotation axis of the main spindle. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-039072 Summary of the Invention [Problem to be solved by the invention]

[0005] When retrofitting a tool post to be movable in the direction of the rotation axis of the spindle on a machine tool that does not already have a tool post that is movable in the direction of the rotation axis of the spindle, it is necessary to add or replace a feed unit and slide base that include a ball screw or linear guide, making it difficult to perform additional work on-site to enable movement of the tool post in the direction of the rotation axis of the spindle after delivery of the machine tool.In addition, depending on the structure of the machine tool, there may not be enough space to add a feed unit or slide base, making it impossible to add the function of moving the tool post in the direction of the rotation axis of the spindle.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a machine tool that adds a position setting function in the direction of the rotation axis of the spindle to a machine in which the tool post is not arranged so as to be freely movable in the direction of the rotation axis of the spindle. [Means for solving the problem]

[0007] In order to achieve the above object, a machine tool according to a first aspect of the present invention comprises: a spindle unit that rotates a workpiece while holding it; a first tool holder that fixes a tool for machining the workpiece; and a second tool holder that moves independently of the first tool holder and fixes a tool for machining the workpiece, wherein the tool fixed to the first tool holder and the tool fixed to the second tool holder can machine the workpiece simultaneously, at least one of the first tool holder and the second tool holder is arranged to be movable in a first direction that intersects with a rotation axis direction of the spindle unit, and the first tool holder comprises a tool holder main body, a slider that fixes the tool, and a position adjustment unit that manually moves, adjusts, and fixes the position of the slider relative to the blade holder body in the direction of the rotation axis. [Effects of the Invention]

[0008] According to the present invention, a function for setting the position in the direction of the rotation axis of the spindle can be added to a machine in which the tool rest is not provided so as to be freely movable in the direction of the rotation axis of the spindle. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a plan view of a machine tool according to an embodiment of the present invention; [Figure 2] 1 is a side view of a machine tool according to an embodiment of the present invention; [Figure 3] 1 is an enlarged plan view of a machine tool according to an embodiment of the present invention; [Figure 4] 1 is a front view of a machine tool according to an embodiment of the present invention; [Figure 5] FIG. 2 is an enlarged view of a rear tool rest in a front view of a machine tool according to an embodiment of the present invention. [Figure 6] FIG. 2 is an enlarged view of a rear tool rest in a side view of a machine tool according to an embodiment of the present invention. [Figure 7] 7 is a diagram in which the position adjustment unit of the rear tool rest is omitted from FIG. 6. [Figure 8] FIG. 4 is a bottom view of the rear tool rest according to the embodiment of the present invention. [Figure 9] 9 is a cross-sectional view taken along the line IX-IX in FIG. 6. [Figure 10] 10A and 10B are diagrams illustrating an example of use of a rear tool rest according to an embodiment of the present invention. [Figure 11] 1A to 1C are diagrams illustrating an example of machining a workpiece according to an embodiment of the present invention. [Figure 12] 1A to 1C are diagrams illustrating an example of balance turning of a workpiece according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] A machine tool and a tool rest according to an embodiment of the present invention will be described below with reference to the drawings.

[0011] 1, the machine tool 1 includes a bed S which is the base for the entire machine tool 1, a spindle unit 10 having a spindle 11, a spindle movement mechanism 12Z, a guide bush device 13, a front tool rest unit 20 having a front tool rest 21, a front tool rest movement mechanism 22, a rear tool rest unit 30 having a rear tool rest 31, a rear tool rest movement mechanism 32, and a base 26. The front tool rest unit 20 and the rear tool rest unit 30 are each equipped with a movement mechanism and are therefore independently movable.

[0012] Hereinafter, the rotation axis direction of the main shaft 11 is defined as the Z-axis direction, the height direction perpendicular to the Z-axis direction is defined as the Y-axis direction, and the direction perpendicular to the Y-axis and Z-axis directions is defined as the X-axis direction. In this example, the X-axis direction and the Z-axis direction are horizontal directions. The X-axis direction is an example of a first direction, and the Y-axis direction is an example of a second direction.

[0013] The spindle unit 10 rotates the workpiece W held by the spindle 11. The guide bush device 13 supports the workpiece W held by the spindle 11. The spindle movement mechanism 12Z is ​​installed on the upper surface of the bed S and moves the spindle unit 10 in the Z-axis direction.

[0014] As shown in FIGS. 2 and 3, the front tool rest unit 20 has a front tool rest 21, a front drive 23, an X1 slide 24, and a Y1 slide 25.

[0015] The front tool rest 21 is attached to the Y1 slide 25 and is a tool rest that holds square cutting tools 27, and is capable of mounting four square cutting tools 27. The front tool rest 21 is an example of a second tool holder.

[0016] The front drive 23 is attached to the Y1 slide 25 and is a device for attaching the rotary tools 28. It is installed above the front tool post 21 and can attach three rotary tools 28. The rotary tools 28 are rotated by a front drive rotary motor 23A.

[0017] The front tool post movement mechanism 22 includes an X movement mechanism 22X that moves the X1 slide 24 in the X-axis direction, and a Y movement mechanism 22Y that moves the Y1 slide 25 in the Y-axis direction. The X1 slide 24 is attached to a base 26 so as to be movable in the X-axis direction. The Y1 slide 25 is attached to the X1 slide 24 so as to be movable in the Y-axis direction. The base 26 is fixed to the bed S. With this configuration, the front tool post movement mechanism 22 can move the front tool post 21 and front drive 23 attached to the Y1 slide 25 in the X-axis direction and the Y-axis direction.

[0018] 2 to 4, the rear tool rest unit 30 has a rear tool rest 31, a drill holder 33, a rear drive 34, an X3 slide 35, and a Y3 slide 36. The drill holder 33 and the rear drive 34 are examples of devices for fixing other cutting tools.

[0019] The rear tool rest 31 is attached to the Y3 slide 36 and is a tool rest that holds three square tools 41. The bottom square tool 41 can be moved in the Z-axis direction by a position setting mechanism, as will be described later.

[0020] The drill holder 33 is a holder for fixing drills, attached to the Y3 slide 36. The drill holder 33 is installed above the rear tool rest 31, and five drills 38 can be attached thereto.

[0021] The rear drive 34 is attached to the Y3 slide 36 and is a device for attaching rotary tools 39. It is installed above the drill holder 33 and can attach two rotary tools 39. The rotary tools 39 are rotated by a rear drive rotary motor 34A.

[0022] The rear tool post movement mechanism 32 includes an X movement mechanism 32X that moves the X3 slide 35 in the X-axis direction, and a Y movement mechanism 32Y that moves the Y3 slide 36 in the Y-axis direction. The X3 slide 35 is attached to the base 26 so as to be movable in the X-axis direction. The Y3 slide 36 is attached to the X3 slide 35 so as to be movable in the Y-axis direction. With this configuration, the front tool post movement mechanism 22 can move the rear tool post 31, drill holder 33, and rear drive 34 attached to the Y3 slide 36 in the X-axis direction and the Y-axis direction. With the above configuration, the front tool post 21 and the rear tool post 31 can move in different directions.

[0023] Next, the rear tool rest 31 will be described in detail.

[0024] 5 and 6, the rear tool rest 31 includes a tool rest main body (tool holder main body) 40, a square tool cutting tool 41, a slider 42, a slider guide 43, a position adjustment part 44, and an elastic body 45. The rear tool rest 31 is an example of a first tool holder. The square tool cutting tool 41 is an example of a tool.

[0025] The tool post body 40, to which a plurality of square cutting tools 41 and slider guides 43 are attached, is fixed to the Y3 slide 36 with bolts (not shown). The tool post body 40 is also formed with mounting grooves 40A for mounting the square cutting tools 41B and 41C, a recess 40B for fitting the slider 42, and a mounting hole 40C for mounting the slider guide 43.

[0026] Square cutting tools 41B and 41C are fitted into the mounting groove 40A, and the square cutting tools 41B and 41C are fixed to the tool post body 40 by clamping pieces 51. The clamping pieces 51 are components that fix the square cutting tools 41B and 41C to the mounting groove 40A, and are fixed to the tool post body 40 by bolts 52. The mounting groove 40A and the clamping pieces 51 form a tool fixing portion.

[0027] The square turning tool 41 is a cutting tool used to machine the workpiece W, and includes a square turning tool 41A attached to the slider 42 and square turning tools 41B and 41C attached to the tool post body 40. Because the square turning tool 41A is attached to the slider 42, the cutting edge of the square turning tool 41A can move in the Z-axis direction from the reference cutting edge position AX. The cutting edges of the square turning tools 41B and 41C are fixed at the reference cutting edge position AX and cannot move in the Z-axis direction.

[0028] The slider 42 has a mounting groove 42A for mounting the square tool tool 41A, a protrusion 42B extending in the Z-axis direction shown in FIG. 7, a hole 42C shown in FIG. 9, and a stopper 42D, and is mounted by a slider guide 43 so as to be movable in the Z-axis direction relative to the tool post body 40. A slider fixing bolt 42E for fixing the slider to the slider guide is attached to the bottom surface of the slider 42. The square tool tool 41A is fitted into the mounting groove 42A and fixed to the slider 42 by a tightening piece 53.

[0029] As shown in FIG. 7, the slider guide 43 includes a recess 43A extending in the Z-axis direction, a jib 43B, and an elongated hole 43E through which a slider fixing bolt 42E (shown in FIG. 8) is inserted. The slider guide 43 is fixed to the tool post main body 40 by a bolt 55 inserted through a mounting hole 40C (shown in FIG. 5). A protrusion 42B provided on the slider 42 fits into the recess 43A, and the jib 43B is positioned in the gap. The jib 43B is a slender wedge that fits between the moving parts of the recess 43A and the protrusion 42B. Its position is adjusted from the side with a jib setscrew 43C to adjust the friction between the recess 43A and the protrusion 42B and eliminate play. This configuration allows the slider 42 to slide parallel to the Z-axis direction relative to the slider guide 43. 8, in order to fix the slider 42 to the tool post main body 40 after adjusting the slider 42 in the Z axis direction, the slider guide 43 has an elongated hole 43E extending in the Z axis direction and a slider fixing bolt 42E inserted into the elongated hole 43E. By tightening the slider fixing bolt 42E, the slider 42 is fixed to the slider guide 43 and the tool post main body 40.

[0030] As shown in FIG. 5, the position adjustment unit 44 moves the slider 42 in the Z-axis direction and includes a micrometer for manually adjusting the amount of sliding of the slider 42. Specifically, the position adjustment unit 44 includes a micrometer adjustment unit 44A, a bracket 44B, and a spindle 44C. The micrometer adjustment unit 44A is fixed to the slider guide 43 by the bracket 44B and has a measurement range of, for example, 13 mm. The bracket 44B is an L-shaped fixture, one end of which is fixed to the slider guide 43 and the other end of which supports the micrometer adjustment unit 44A. The spindle 44C is a part that extends from the micrometer adjustment unit 44A. The stopper 42D is attached to the slider 42 and comes into contact with the spindle 44C. The contact portion with the spindle 44C is spherical. Because the contact portion is spherical, errors due to tilt of the mounting portion of the micrometer head when contacting the spindle 44C can be minimized. With this configuration, the position adjustment unit 44 can adjust the position of the slider 42 in the Z-axis direction relative to the slider guide 43 and the tool post main body 40. For example, the slider 42 can adjust the position in the Z-axis direction within a range of 0.5 mm in the direction toward the spindle 11 and 12.5 mm in the direction away from the cutting edge of the angular tool 41A, based on the reference cutting edge position AX. When the cutting edge of the angular tool 41A is positioned at the reference cutting edge position AX, the reading on the micrometer of the position adjustment unit 44 is adjusted to 0.5 mm.

[0031] 9, the elastic body 45 is disposed between the tool post main body 40 and the slider 42. One end of the elastic body 45 is disposed in a hole 42C provided in the slider 42, and the other end is disposed in a hole 40D provided in the tool post main body 40. As a result, the slider 42 is pressed against the spindle 44C of the position adjustment unit 44, and the stopper 42D of the slider 42 comes into contact with the spindle 44C. The elastic body 45 includes, for example, a coil spring, and in this example, four coil springs are used.

[0032] Next, a method for adjusting the position of the cutting edge of the square tool 41A attached to the rear tool rest 31 will be described.

[0033] 5, the cutting edge of the angular tool tool 41A is positioned at the reference cutting edge position AX. In this case, the reading of the micrometer of the position adjustment unit 44 is 0.5 mm. By adjusting the protrusion amount of the spindle 44C of the position adjustment unit 44, the angular tool tool 41A can be moved in the Z-axis direction.

[0034] When adjusting the cutting edge of the square tool 41A in the Z-axis direction, first, the slider fixing bolt 42E shown in FIG. 8 is loosened, so that the slider 42 can be adjusted in the Z-axis direction.

[0035] Next, the operator rotates the head while watching the micrometer scale to position the spindle 44C at the desired position. When the spindle 44C of the position adjustment unit 44 is moved in the Z-axis direction, the slider 42 to which the angular cutting tool 41A is fixed is pushed by the elastic body 45 installed between the spindle 44C and the slider 42 or the spindle 44C, as shown in FIG. 10, and the slider 42 moves parallel to the Z-axis along with the spindle 44C. At this time, the cutting edge of the angular cutting tool 41A is positioned at cutting edge position BX. Because the slider 42 moves parallel to the Z-axis, the offset amount D1 from the reference cutting edge position AX to the cutting edge position BX is the same as the value obtained by subtracting 0.5 mm from the reading on the micrometer scale of the position adjustment unit 44.

[0036] Next, after adjusting the slider 42 in the Z-axis direction, the slider fixing bolt 42E is tightened to fix the slider 42 to the tool post main body 40. This fixes the slider 42 to the slider guide 43 and the tool post main body 40.

[0037] Next, a method for machining the workpiece W by the machine tool 1 will be described.

[0038] First, as described above, before operating the machine, the position of the cutting edge of the angular cutting tool 41A attached to the rear tool rest 31 is adjusted. The offset amount D1 from the reference cutting edge position AX to the cutting edge position BX can be set arbitrarily.

[0039] Next, as shown in FIG. 3, the spindle unit 10 rotates the workpiece W held by the spindle 11.

[0040] The angular cutting tool 27 used for machining the front tool post 21 and the angular cutting tool 41A attached to the rear tool post 31 are each positioned in the Y-axis direction. Next, the front tool post 21 and the rear tool post 31 are each moved in the X-axis direction, the cutting edges of the angular cutting tool 27 and the angular cutting tool 41A are placed against the workpiece W, and the workpiece W held by the main spindle 11 is moved in the Z-axis direction by the main spindle movement mechanism 12Z, thereby cutting two locations simultaneously. After machining is completed, the front tool post 21 and the rear tool post 31 are moved in the X-axis direction to retract the angular cutting tool 27 and the angular cutting tool 41A from the workpiece W.

[0041] 11, when the position of the cutting edge of the angular cutting tool 41A is adjusted to an offset amount D1 from the reference cutting edge position AX to the cutting edge position BX, two locations can be machined simultaneously using the angular cutting tool 27 attached to the front tool rest 21 and the angular cutting tool 41A attached to the rear tool rest 31. The cutting edge of the angular cutting tool 27 attached to the front tool rest 21 is positioned at the reference cutting edge position AX in the Z-axis direction. The cutting edge of the angular cutting tool 41A is positioned at the cutting edge position BX in the Z-axis direction.

[0042] 12, the position of the cutting edge of the angular turning tool 41A is adjusted so that the offset amount D1 from the reference cutting edge position AX to the cutting edge position BX is minute. The angular turning tool 27 attached to the front tool post 21 is set as the cutting depth for roughing, and the angular turning tool 41A attached to the rear tool post 31 is set as the cutting depth for finishing, and the workpiece held by the spindle is moved in the Z-axis direction for processing. This makes it possible to perform balanced turning, in which roughing is performed by the angular turning tool 27 attached to the front tool post 21 and finishing is performed by the angular turning tool 41A attached to the rear tool post 31 simultaneously.

[0043] (effect) According to the embodiment described above, the following effects are achieved. (1) Machine tool 1 includes spindle 11 supported so as to be movable in the direction of the rotation axis, front tool post 21, and rear tool post 31. Rear tool post 31 includes tool post main body 40, slider 42 that fixes angular tool 41A, and position adjustment unit 44 that manually adjusts slider 42 in the Z-axis direction relative to tool post main body 40, thereby allowing the position of angular tool 41A in the Z-axis direction to be freely changed. This allows the front tool post 21 and the rear tool post 31 to machine the workpiece W simultaneously, expanding the machining patterns and enabling a variety of overlapping machining, thereby shortening the cycle time. For example, as shown in Fig. 11, two locations can be machined simultaneously using the front tool post 21 and the rear tool post 31. Also, as shown in Fig. 12, balance turning can be performed in which the square tool 27 of the front tool post 21 performs rough machining of the outer diameter of the workpiece W, while the square tool 41A of the rear tool post 31, whose position in the Z-axis direction has been set, performs finish machining. After setting the position of the square cutting tool 41A attached to the slider 42 in the Z-axis direction, the slider 42 can be fixed to the slider guide 43 and the tool post main body 40 by tightening the slider fixing bolt 42E. This ensures that the square cutting tool 41A is securely fixed, preventing it from moving and enabling high-precision machining. In addition, compared to machines equipped with a Z3 control axis that moves the blade in the Z-axis direction, this machine is cheaper because it does not require a feed unit and slide unit for the Z3 axis. Furthermore, for machines that do not have a Z3-axis position setting mechanism, the Z3-axis position setting function can be easily retrofitted by simply replacing the tool post, without adding or replacing the feed or slide units that include ball screws, linear guides, etc. Furthermore, the Z3-axis position setting function can be added in a space-saving manner to machines that do not have the space to install the feed unit or slide base for the Z3 axis. (2) The front tool rest 21 and the rear tool rest 31 are arranged opposite each other with the workpiece W in between, which makes it possible to easily perform a variety of overlap machining and balance turning. (3) The tool rest main body 40 is attached so as to be movable in the Y-axis direction, and is provided with a tool fixing section for fixing the square tools 41B and 41C, so that a variety of machining operations can be performed by switching between the square tools 41A to 41C. In addition, because the square tools 41A to 41C can be switched simply by moving the rear tool rest 31 in the Y-axis direction, tool replacement is quick and the tool can be easily switched to other tools, such as the rear drive 34 and the drill holder 33. (4) By providing the slider guide 43 that guides the slider 42 in the Z-axis direction, the square tool 41A can be slid in parallel in the Z-axis direction with a simple mechanism that is configured with a small number of parts. (5) By providing a micrometer for adjusting the amount of movement of the slider 42, the slider 42 can be easily and reliably set to any position based on the reading of the micrometer.

[0044] The present disclosure is not limited to the above-described embodiments and drawings. Modifications (including deletion of components) may be made as appropriate within the scope of the present disclosure. An example of such a modification is described below.

[0045] (Variation) In the above embodiment, the machine tool 1 includes a spindle unit 10 having a spindle 11, a spindle movement mechanism 12Z, a guide bush device 13, a front tool post unit 20 having a front tool post 21, a front tool post movement mechanism 22, a rear tool post unit 30 having a rear tool post 31, and a rear tool post movement mechanism 32. However, the machine configuration is not limited to the embodiment. For example, the front tool post 21 and the rear tool post 31 may move in different directions, or the front tool post 21 may move in a direction other than the X-axis and Z-axis directions. Furthermore, a back spindle or a back tool post may be provided, or the guide bush device 13 may be omitted. The back spindle holds and rotates a workpiece received from the spindle and is movable in the X2 and Z2 directions. The back tool post machines the workpiece held by the back spindle and is movable in the Y2 direction.

[0046] Furthermore, the configuration of the tool post is not limited to that of the embodiment, and the positions of the tool post, drill holder, front drive, and rear drive may be changed, added, or deleted freely. The number, mounting positions, and shapes of the cutting tools and rotary tools attached to each unit are also arbitrary. Although the embodiment has been described as an example in which the cutting tool is a square cutting tool 41, the cutting tool is not particularly limited as long as it can process the workpiece W.

[0047] In the above embodiment, an example has been described in which the position adjustment unit 44 includes a micrometer that adjusts the sliding distance of the slider 42. The micrometer head used is not limited to the specifications of the embodiment, and may be changed depending on the workpiece to be machined. For example, the maximum movement range may be larger or smaller than 13 mm in the embodiment. Furthermore, the position adjustment unit 44 may adjust the sliding distance of the slider 42 using a configuration other than a micrometer.

[0048] In the above embodiment, an example has been described in which four coil springs are used as the elastic body 45, but the number of coil springs disposed between the tool post main body 40 and the slider 42 may be more or less than four. Furthermore, the installation position of the springs is not limited to the embodiment, and any spring other than a coil spring may be used as long as it is capable of elastic deformation.

[0049] In the above embodiment, an example has been described in which one square cutting tool 41A is attached to the slider 42, but the number of cutting tools attached to the slider 42 may be two or more. Also, multiple sliders 42 may be installed on the tool post so that the position of the cutting tool attached to each slider in the Z-axis direction can be set individually. Also, the installation location of the slider 42 may be any position on the tool post. In the embodiment, the slider 42 is installed at the bottom of the rear tool post, but it may also be at the top or the center.

[0050] In the above embodiment, an example has been described in which the rear tool rest 31 is provided with the slider 42 that fixes the square tool 41A, but the front tool rest 21 may also be provided with a function for setting the position of the tool in the Z-axis direction. [Explanation of symbols]

[0051] 1...machine tool, 10...spindle unit, 11...spindle, 12Z...spindle movement mechanism, 13...guide bush device, 20...front tool post unit, 21...front tool post, 22...front tool post movement mechanism, 22X...X movement mechanism, 22Y...Y movement mechanism, 23...front drive, 23A...front drive rotary motor, 24...X1 slide, 25...Y1 slide, 26...base, 27...square tool, 28...rotary tool, 30...rear tool post unit, 31...rear tool post, 32...rear tool post movement mechanism, 32X...X movement mechanism, 32Y...Y movement mechanism, 33...drill holder, 34...rear drive, 34A...rear drive rotary motor, 35...X3 slide, 36...Y3 slide, 38...drill, 39 ...Rotary tool, 40...Turret body, 40A...Mounting groove, 40B...Recess, 40C...Mounting hole, 40D...Hole, 41, 41A, 41B, 41C...Square tool holder, 42...Slider, 42A...Mounting groove, 42B...Convex portion, 42C...Hole, 42D...Stopper, 42E...Slider fixing bolt, 43...Slider guide, 43A...Recess, 43B...Jib, 43C...Jib setscrew, 43E...Oval hole, 44...Position adjustment portion, 44A...Micrometer adjustment portion, 44B...Bracket, 44C...Spindle, 45...Elastic body, 51, 53...Tightening piece, 52, 54, 55...Bolt, S...Bed, W...Workpiece, AX...Reference cutting edge position, BX...Cutting edge position, D1...Offset amount

Claims

1. a spindle unit that holds and rotates the workpiece; a first blade holder for fixing a blade for machining the workpiece, and a second blade holder that moves independently of the first blade holder and fixes a blade for machining the workpiece; Equipped with The blade fixed to the first blade holder and the blade fixed to the second blade holder can simultaneously machine the workpiece, At least one of the first blade holder and the second blade holder is disposed to be movable in a first direction intersecting with a rotation axis direction of the spindle unit, The first blade holder includes: a blade holder body; a slider for fixing the blade; a position adjustment unit that manually moves, adjusts, and fixes the position of the slider relative to the blade holder body in the direction of the rotation axis; A machine tool equipped with:

2. the first blade holder and the second blade holder are disposed opposite to each other with the workpiece therebetween; The machine tool according to claim 1.

3. the blade holder body is disposed on a slide that is movable in a second direction intersecting the rotation axis direction and the first direction by a moving mechanism, The slide further includes another blade that can be switched with the blade fixed to the slider, the movement mechanism switches between the blade fixed to the slider and the other blade by moving the slide in the second direction; 3. The machine tool according to claim 1 or 2.

4. a slider guide for guiding the slider in the direction of the rotation axis; 3. The machine tool according to claim 1 or 2.

5. a micrometer for adjusting the amount of movement of the slider; 3. The machine tool according to claim 1 or 2.

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