Working machinery

Abstract

To devise an arrangement position of a camera to suppress adhesion of a coolant to the camera.SOLUTION: A machine tool is provided with: a cover body partitioning and forming processing areas for machining a work-piece; an ejecting part for ejecting a coolant to the work-piece; a first work spindle for holding the work-piece rotatably; a tool spindle, positioned higher than the first work spindle, which holds the tool rotatably; and a plurality of cameras arranged in the machining areas. Each of the plurality of cameras is arranged higher than the first work spindle and is arranged lower than a ceiling in the machining area so that a machined point of the work-piece by the tool is included in a photographing visual field of the camera.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to machine tools. [Background technology]

[0002] Conventionally, machine tools equipped with cameras inside the machine have been known. As an example, Japanese Patent Application Laid-Open No. 2018-94689 (Patent Document 1) discloses a machine tool for monitoring a machining area from multiple directions using multiple cameras. Three cameras for monitoring the machining area are installed inside the machine tool. The three cameras are positioned at the same height as the workpiece spindle for holding the workpiece. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-94689 Summary of the Invention [Problem to be solved by the invention]

[0004] If each camera is placed at the same height as the work spindle, the coolant discharged onto the work spindle will splash onto the camera. As a result, the operator will not be able to observe the machining area from multiple directions. Therefore, it is necessary to devise a position for the camera to prevent the coolant from adhering to the camera. [Means for solving the problem]

[0005] One example of the present disclosure provides a machine tool capable of machining a workpiece using a tool. The machine tool includes a cover defining a machining area for machining the workpiece, a discharge unit for discharging coolant onto the workpiece, a first work spindle for rotatably holding the workpiece, a tool spindle located higher than the first work spindle for rotatably holding the tool, and a plurality of cameras arranged within the machining area. Each of the cameras is located higher than the first work spindle and lower than the ceiling of the machining area so that the machining point of the workpiece with the tool is included in the field of view of the camera.

[0006] In one example of the present disclosure, the machine tool further includes a drive unit capable of moving the tool spindle within the machining area, and each of the plurality of cameras is arranged so that the machining point is included in the field of view of the camera regardless of where the tool spindle is located within the machining area.

[0007] In one example of the present disclosure, the cover body is provided with a door that leads to the processing area, and each of the plurality of cameras is disposed behind the door and in front of the first workpiece spindle in a front view of the processing area through the door.

[0008] In one example of the present disclosure, the tool spindle is disposed further back than the first workpiece spindle in the front view.

[0009] In one example of the present disclosure, the plurality of cameras include a first camera and a second camera. The first camera is provided on a first side surface within the processing area. The second camera is provided on a second side surface within the processing area. The second side surface faces the first side surface.

[0010] In one example of the present disclosure, the plurality of cameras further includes a third camera, the second camera and the third camera being arranged side by side in the direction of gravity on the second side surface.

[0011] In one example of the present disclosure, the machine tool further includes a second work spindle for supporting the workpiece from the opposite side to the first work spindle, and each of the plurality of cameras is disposed at a position higher than the second work spindle.

[0012] The above and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the invention taken in conjunction with the accompanying drawings. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram illustrating an example of the appearance of a machine tool. [Figure 2] FIG. 1 is a diagram illustrating an example of a device configuration of a machine tool. [Figure 3] FIG. 2 is a diagram illustrating an example of a control mechanism of a machine tool. [Figure 4] A front view showing the machining area from the door side of the machine tool is shown. [Figure 5] FIG. 1 shows a plan view of the machining area from above the machine tool. [Figure 6] A front view showing the machining area from the door side of the machine tool is shown. [Figure 7] FIG. 1 shows a plan view of the machining area from above the machine tool. [Figure 8] A front view showing the machining area from the door side of the machine tool is shown. [Figure 9] FIG. 1 shows a plan view of the machining area from above the machine tool. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, each embodiment according to the present invention will be described with reference to the drawings. In the following description, the same parts and components are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated. Note that each embodiment and each modified example described below may be selectively combined as appropriate.

[0015] <Appearance of Machine Tool 100> First, referring to FIG. 1, the appearance of machine tool 100 will be described. FIG. 1 is a diagram showing an example of the appearance of machine tool 100.

[0016] Machine tool 100 has a cover body 80. The cover body 80 forms the appearance of machine tool 100 and partitions and forms a processing area AR for processing a workpiece.

[0017] Also, machine tool 100 has a door 90. The door 90 may be configured to be manually opened and closed by an operator, or may be configured to be automatically opened and closed by a drive mechanism such as a motor. As an example of the working process, the operator sets the workpiece to be processed in the processing area AR by opening the door 90. Then, the operator closes the door 90 and starts processing the workpiece. When the processing of the workpiece is completed, the operator opens the door 90 and takes out the processed workpiece from the processing area AR.

[0018] Machine tool 100 is provided with an operation panel 400. The operation panel 400 has a display 405 for displaying various information related to processing and operation keys 406 for receiving various operations on machine tool 100.

[0019] <Definition of Directions> Hereinafter, the horizontal direction from the door 90 toward the processing area AR is also referred to as the X-axis direction. Also, the horizontal direction orthogonal to the X-axis direction is also referred to as the Z-axis direction. The gravitational direction orthogonal to both the X-axis direction and the Y-axis direction is also referred to as the Y-axis direction.

[0020] <Device Configuration of Machine Tool 100> Next, referring to FIG. 2, the device configuration of machine tool 100 will be described. FIG. 2 is a diagram showing an example of the device configuration of machine tool 100.

[0021] Machine tool 100 is, for example, a multi-tasking machine equipped with a turning function in which a tool is brought into contact with a rotating workpiece to machine the workpiece, and a milling function in which a rotating tool is brought into contact with the workpiece to machine the workpiece.

[0022] Machine tool 100 as a multi-tasking machine has, for example, bed 95, first workpiece spindle 110, second workpiece spindle 120, tool spindle 130, and tool rest 150.

[0023] Bed 95 is a base member for supporting various devices provided within machine tool 100. In the example of Fig. 2, bed 95 supports first work spindle 110, second work spindle 120, tool spindle 130, and tool rest 150. Bed 95 is installed on the floor of a factory or the like. Bed 95 is made of metal such as cast iron.

[0024] The first work spindle 110 is configured to be rotatable while holding the workpiece W. More specifically, the first work spindle 110 is provided with a first chuck mechanism 112. The first chuck mechanism 112 is a mechanism for fixing the workpiece W to the first work spindle 110. The first work spindle 110 is also configured to be rotatable about an axis AX1 that extends along the axial direction of the first work spindle 110.

[0025] The second work spindle 120 rotates the workpiece W while supporting it from the opposite side to the first work spindle 110. More specifically, the second work spindle 120 is configured to be movable in the Z-axis direction by various drive mechanisms such as a motor, and supports the workpiece W from the opposite side to the first work spindle 110. The second work spindle 120 is also provided with a second chuck mechanism 122. The second chuck mechanism 122 is a mechanism for fixing the workpiece W to the second work spindle 120. Furthermore, the second work spindle 120 is configured to be rotatable about an axis AX2 that extends along the axial direction of the second work spindle 120.

[0026] The tool spindle 130 is provided at a position higher than the first workpiece spindle 110 and the second workpiece spindle 120. Also, the tool spindle 130 is configured to be rotatable while holding the tool T. Further, the tool spindle 130 is configured to be movable in each direction of the X-axis direction, the Y-axis direction, and the Z-axis direction by various drive mechanisms such as a motor. The tool spindle 130 performs milling on the workpiece W fixed to the first workpiece spindle 110 by bringing the rotating tool T into contact with it.

[0027] The tool rest 150 has a turret 152. The turret 152 is configured to be rotatable about an axis AX3 parallel to the Z-axis direction. The turret 152 holds a plurality of tools at intervals in the circumferential direction about the axis AX3. Also, the tool rest 150 is configured to be movable in the X-axis direction and the Y-axis direction by various drive mechanisms such as a motor. The tool rest 150 performs turning on the workpiece W that is rotationally driven by the first workpiece spindle 110 by bringing the fixed tool held by the turret 152 into contact with it.

[0028] <D. Control Configuration of Machine Tool 100> Next, referring to FIG. 3, the control mechanism of the machine tool 100 will be described. FIG. 3 is a diagram showing an example of the control mechanism of the machine tool 100.

[0029] As shown in FIG. 3, the machine tool 100 includes a control unit 50, drive units 210, 220, 230A, 230B, a camera 250, a discharge pump 260, and a discharge unit 265.

[0030] The control unit 50 is a device for controlling the machine tool 100. The device configuration of the control unit 50 is arbitrary. The control unit 50 may be composed of a single control unit or a plurality of control units. In the example of FIG. 3, the control unit 50 is composed of a CPU (Central Processing Unit) unit 200, a CNC (Computer Numerical Control) unit 300, and an operation panel 400.

[0031] The drive unit 210 is a drive mechanism for driving the first workpiece spindle 110. The drive unit 210 may be composed of a single drive unit or multiple drive units. In the example of Fig. 3, the drive unit 210 is composed of a motor driver 211C and a motor 212C.

[0032] The motor driver 211C sequentially receives target position inputs from the control unit 50 and controls the motor 212C. As a result, the workpiece held by the first workpiece spindle 110 rotates around the axial direction of the first workpiece spindle 110 (i.e., the Z-axis direction) as the center of rotation. The motor 212C may be an AC motor, a stepping motor, a servo motor, or any other type of motor.

[0033] The drive unit 220 is a drive mechanism for driving the second workpiece spindle 120. The drive unit 220 may be composed of a single drive unit or multiple drive units. In the example of Fig. 3, the drive unit 220 is composed of a motor driver 221Z and a motor 222Z.

[0034] The motor driver 221Z sequentially receives target position inputs from the control unit 50 and controls the motor 222Z, which causes the motor 222Z to move the second workpiece spindle 120 to any position in the Z-axis direction. The motor 222Z may be an AC motor, a stepping motor, a servo motor, or any other type of motor.

[0035] The drive unit 230A is a drive mechanism for moving the position of the tool spindle 130. The drive unit 230A may be composed of a single drive unit or multiple drive units. In the example of Fig. 3, the drive unit 230A is composed of motor drivers 231X to 231Z and motors 232X to 232Z.

[0036] The motor driver 231X sequentially receives target position inputs from the control unit 50 and controls the motor 232X, which then drives the tool spindle 130 to any position in the X-axis direction. The motor 232X may be an AC motor, a stepping motor, a servo motor, or any other type of motor.

[0037] The motor driver 231Y sequentially receives target position inputs from the control unit 50 and controls the motor 232Y, thereby driving the tool spindle 130 to any position in the Y-axis direction. The motor 232Y may be an AC motor, a stepping motor, a servo motor, or any other type of motor.

[0038] The motor driver 231Z sequentially receives target position inputs from the control unit 50 and controls the motor 232Z, which then moves the tool spindle 130 to any position in the Z-axis direction. The motor 232Z may be an AC motor, a stepping motor, a servo motor, or any other type of motor.

[0039] The drive unit 230B is a drive mechanism for rotationally driving the tool spindle 130. The drive unit 230B may be configured with a single drive unit or multiple drive units. In the example of Fig. 3, the drive unit 230B is configured with motor drivers 231A and 231B and motors 232A and 232B.

[0040] The motor driver 231A sequentially receives input of target rotation speeds from the control unit 50 and controls the motor 232A. The motor 232A drives the tool spindle 130 to rotate around the X-axis direction. The motor 232A may be an AC motor, a stepping motor, a servo motor, or any other type of motor.

[0041] The motor driver 231B sequentially receives the input of the target position from the control unit 50 and controls the motor 232B. The motor 232B rotationally drives the tool spindle 130 about the axial direction of the tool spindle 130 as the rotation center. The motor 232B may be an AC motor, a stepping motor, a servo motor, or other types of motors.

[0042] The camera 250 is provided within the machining area AR of the machine tool 100 and photographs the machining area AR. The camera 250 is connected to, for example, the operation panel 400. The operation panel 400 displays the moving image from the camera 250 on the above-described display 405. Thereby, the operator can check the state within the machine tool 100.

[0043] The discharge unit 265 is provided within the machining area AR of the machine tool 100 and discharges coolant toward the tool and the workpiece. The discharge unit 265 is controlled by, for example, the CPU unit 300. The CPU unit 300 controls the discharge pump 260 connected to the discharge unit 265 and controls the discharge amount of coolant by the discharge unit 265.

[0044] <E. Arrangement position of camera 250> Next, referring to FIGS. 4 and 5, the arrangement position of the camera 250 within the machine tool 100 will be described. FIG. 4 shows a front view representing the machining area AR from the door 90 side. FIG. 5 shows a plan view representing the machining area AR from above.

[0045] A plurality of cameras 250 are arranged within the machining area AR. In the examples of FIGS. 4 and 5, two cameras 250A and 250B are arranged within the machining area AR.

[0046] The above-mentioned discharge unit 265 is provided, for example, on the tool spindle 130, and discharges coolant CL toward the workpiece W held by the first workpiece spindle 110. The coolant CL discharged toward the workpiece W scatters in various directions. If the cameras 250A, 250B are provided at a position lower than the first workpiece spindle 110, there is a high possibility that the scattered coolant CL will adhere to the cameras 250A, 250B. Therefore, the cameras 250A, 250B are disposed at a position higher than the first workpiece spindle 110 in the direction of gravity. This makes it possible to prevent the coolant CL from scattering from the first workpiece spindle 110 toward the cameras 250A, 250B.

[0047] Preferably, the tool spindle 130 is provided at a higher position than the first workpiece spindle 110. The cameras 250A, 250B are arranged at a higher position than the position of the tool spindle 130 when machining the workpiece W. This further prevents the coolant CL from splashing onto the cameras 250A, 250B.

[0048] Furthermore, when the cameras 250A and 250B are arranged on the ceiling 81 in the machining area AR, there is a possibility that the machining point of the workpiece W with the tool T (hereinafter also referred to as the "machining point P") will be blocked by the tool spindle 130 and will not be captured by the cameras 250A and 250B. Therefore, the cameras 250A and 250B are arranged at a position lower than the ceiling 81 so that the machining point P is included in the imaging fields CA and CB. More specifically, the cameras 250A and 250B are arranged so that they overlook the workpiece W obliquely from above and so that their imaging optical axes pass between the first workpiece spindle 110 and the tool spindle 130. This allows the cameras 250A and 250B to capture images of the machining point P from various directions without being blocked by the tool spindle 130.

[0049] The tool spindle 130 may be driven by the drive unit 230A described above. In this case, the position of the tool spindle 130 changes within the machining area AR. Taking this into consideration, the cameras 250A and 250B are arranged so that the machining point P is included in the imaging fields CA and CB regardless of where the tool spindle 130 is located within the machining area AR. In other words, the camera 250A is arranged so that the line connecting the camera 250A and the machining point P is not blocked by the movable area of ​​the tool spindle 130, and the camera 250B is arranged so that the line connecting the camera 250B and the machining point P is not blocked by the movable area of ​​the tool spindle 130. This allows the cameras 250A and 250B to photograph the machining point P regardless of the position of the tool spindle 130. When three or more cameras are used, the cameras may be arranged so that at least two of the cameras can photograph the machining point P regardless of the position of the tool spindle.

[0050] The camera 250A is provided on a side surface 82A (first side surface) within the processing area AR. The camera 250B is provided on a side surface 82B (second side surface) within the processing area AR. The side surfaces 82A and 82B are part of the walls that make up the processing area AR and face each other. By providing the camera 250A on the side surface 82A and the camera 250B on the side surface 82B, the cameras 250A and 250B can photograph the processing point P from opposite directions.

[0051] Furthermore, in a front view of the machining area AR seen through the door 90 from the front face 83, the cameras 250A and 250B are arranged further back than the door 90 and further forward than the first workpiece spindle 110. In other words, the cameras 250A and 250B are arranged between the door 90 and the first workpiece spindle 110 in the front view. This allows the cameras 250A and 250B to photograph the machining point P from the front side without being obstructed by devices arranged further back than the first workpiece spindle 110.

[0052] As an example of a device arranged on the back side of the first work spindle 110, a tool spindle 130 can be mentioned. In this case, each device is arranged in the order of "camera 250A, 250B → first work spindle 110 → tool spindle 130" from the door 90 side. As a result, the cameras 250A, 250B can capture the processing point P from the front side without being obstructed by the tool spindle 130.

[0053] In the above description, the positional relationship among the first work spindle 110, the tool spindle 130, and the cameras 250A, 250B has been mainly described. However, the same can be said about the positional relationship among the second work spindle 120, the tool spindle 130, and the cameras 250A, 250B.

[0054] As an example, the cameras 250A, 250B are arranged at a position higher than the second work spindle 120 in the gravitational direction. Thereby, it is possible to suppress the coolant CL from scattering from the second work spindle 120 to the cameras 250A, 250B.

[0055] Also, in a front view of viewing the processing area AR through the door 90 from the front 83, the cameras 250A, 250B are arranged on the back side of the door 90 and on the front side of the second work spindle 120. In other words, in this front view, the cameras 250A, 250B are arranged between the door 90 and the second work spindle 120. As a result, the cameras 250A, 250B can capture the processing point P from the front side without being obstructed by a device arranged on the back side of the second work spindle 120.

[0056] As an example of a device arranged on the back side of the second work spindle 120, a tool spindle 130 can be mentioned. In this case, each device is arranged in the order of "camera 250A, 250B → second work spindle 120 → tool spindle 130" from the door 90 side. As a result, the cameras 250A, 250B can capture the processing point P from the front side without being obstructed by the tool spindle 130.

[0057] <F. Use of Image> Next, the use of the moving images obtained from the above-described cameras 250A and 250B will be described.

[0058] As an example, the moving images obtained from the above-described cameras 250A and 250B are displayed on the display 405 of the operation panel 400. At this time, the operation panel 400 switches the moving images of the cameras 250A and 250B according to a user operation on the operation key 406. Thereby, the operator can check the state of the machining point P from a plurality of directions.

[0059] As another example, the machine tool 100 stores moving images for a predetermined time including the timing when a predetermined machining abnormality has occurred. More specifically, the machine tool 100 sequentially stores the moving images obtained from the cameras 250A and 250B in a volatile storage area. When the data size of the moving images in the storage area exceeds a predetermined amount, the machine tool 100 overwrites the old moving images with new moving images. Then, based on the occurrence of a predetermined machining abnormality, the machine tool 100 transfers the moving images for a predetermined time including the occurrence timing to a non-volatile storage area. Thereby, the moving images before and after the occurrence of the machining abnormality are saved, and the operator can search for the cause of the machining abnormality that occurred around the machining point P.

[0060] Note that the performance of the camera 250A and the performance of the camera 250B may be the same or different. The parts of the cameras 250A and 250B can be appropriately changed according to the use of the moving images. As an example, a lens with a wider angle of view may be adopted for the cameras 250A and 250B, or a sub-lens with a higher maximum shooting magnification may be adopted for the cameras 250A and 250B.

[0061] <G. Modified Example 1> Next, referring to FIGS. 6 and 7, a modified example 1 regarding the arrangement of the camera 250 will be described. FIG. 6 shows a front view of the machining area AR as viewed from the door 90 side. FIG. 7 shows a plan view of the machining area AR as viewed from above.

[0062] In the examples shown in FIGS. 4 and 5 above, camera 250A was provided on side surface 82A and camera 250B was provided on side surface 82B. In contrast, in this modified example, cameras 250A and 250B are provided on the same surface. In the examples of FIGS. 6 and 7, cameras 250A and 250B are provided on the same side surface 82B. Since other matters are as described above, the explanations of those matters will not be repeated below.

[0063] Cameras 250A and 250B are arranged side by side in the gravitational direction on side surface 82B in the machining area AR, for example. At this time, cameras 250A and 250B are arranged at a predetermined distance from each other. Thereby, cameras 250A and 250B can photograph the machining point P with a parallax of a predetermined distance. By switching and displaying the moving images of cameras 250A and 250B, the operator can more easily grasp the sense of distance.

[0064] In the examples of FIGS. 6 and 7, cameras 250A and 250B are provided on side surface 82B, but they may be provided on side surface 82A.

[0065] <H. Modified Example 2> Next, referring to FIGS. 8 and 9, a second modified example regarding the arrangement of camera 250 will be described. FIG. 8 shows a front view of the machining area AR as viewed from the door 90 side. FIG. 9 shows a plan view of the machining area AR as viewed from above.

[0066] In the examples of FIGS. 4 and 5 above, two cameras 250A and 250B were arranged in the machining area AR. In contrast, in this modified example, three cameras 250A to 250C are arranged in the machining area AR. Since other matters are as described above, the explanations of those matters will not be repeated below.

[0067] In this modified example, the camera 250A is provided on the side surface 82A of the machining area AR. Also, the cameras 250B and 250C are provided on the side surface 82B facing the side surface 82A. By switching and displaying the moving images of the cameras 250A to 250C, the operator can check the machining point P from various directions.

[0068] Also, the cameras 250B and 250C are arranged side by side in the direction of gravity and provided on the side surface 82B. At this time, the cameras 250B and 250C are arranged at a predetermined distance from each other. Thereby, the cameras 250B and 250C can photograph the machining point P with a parallax of a predetermined distance. By switching and displaying the moving images of the cameras 250B and 250C, it becomes easier for the operator to grasp the sense of distance.

[0069] In the examples of FIGS. 8 and 9, the example in which the three cameras 250A to 250C are arranged in the machining area AR has been described, but four or more cameras may be arranged in the machining area AR.

[0070] <I. Modified Example 3> In the above description, the explanation has been made on the premise that the machine tool 100 is a compound machining machine having a turning function and a milling function. However, the machine tool 100 does not necessarily have to be a compound machining machine. As an example, the machine tool 100 may be a horizontal or vertical machining center.

[0071] The machine tool 100 as a machining center does not have the above-described first workpiece spindle 110 and the above-described second workpiece spindle 120, and has only the tool spindle 130. Therefore, the arrangement positions of the cameras 250A and 250B in the machining area AR are determined by the positional relationship with the tool spindle 130.

[0072] More specifically, the cameras 250A, 250B are disposed at a position higher than the position of the tool spindle 130 during machining of the workpiece W. This makes it possible to prevent the coolant CL from adhering to the cameras 250A, 250B. Preferably, the cameras 250A, 250B are disposed side by side at the same height.

[0073] Furthermore, the cameras 250A and 250B are disposed at positions lower than the ceiling 81 in the machining area AR so that the machining point P of the workpiece W is included in the imaging fields CA and CB. This allows the cameras 250A and 250B to capture images of the machining point P without being blocked by the tool spindle 130.

[0074] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0075] 50 control unit, 80 cover body, 81 ceiling, 82A side, 82B side, 83 front, 90 door, 95 bed, 100 machine tool, 110 first work spindle, 112 first chuck mechanism, 120 second work spindle, 122 second chuck mechanism, 130 tool spindle, 150 tool rest, 152 turret, 200 CPU unit, 210 drive unit, 211C motor driver, 212C motor, 220 drive unit, 221Z motor driver, 222Z motor, 230A drive unit, 230B drive unit, 231A motor driver, 231B motor driver, 231X motor driver, 231Y motor driver, 231Z motor driver, 232A motor, 232B motor, 232X motor, 232Y Motor, 232Z motor, 250 camera, 250A camera, 250B camera, 250C camera, 260 discharge pump, 265 discharge section, 300 CPU unit, 300 CNC unit, 400 operation panel, 405 display, 406 operation key.

Claims

1. A machine tool capable of machining a workpiece using a tool, a cover body defining a processing area for processing the workpiece; a discharge portion for discharging coolant onto the workpiece; a first work spindle for rotatably holding the work; a tool spindle located at a position higher than the first work spindle and configured to rotatably hold the tool; a plurality of cameras disposed within the processing area; Each of the plurality of cameras It is disposed at a position higher than the first work spindle, and The tool is disposed at a position lower than the ceiling in the processing area so that the processing point of the workpiece by the tool is included in the field of view of the camera, The cover body is provided with a door leading to the processing area, each of the plurality of cameras is disposed on the rear side of the door and on the front side of the first workpiece spindle in a front view of the machining area through the door, The machine tool, wherein the tool spindle is disposed further back than the first work spindle in the front view.

2. The machine tool further includes a drive unit capable of moving the tool spindle within the machining area; 2. The machine tool according to claim 1, wherein each of the plurality of cameras is arranged so that the machining point is included in the field of view of the camera regardless of where the tool spindle is located within the machining area.

3. The plurality of cameras A first camera; a second camera; the first camera is provided on a first side surface within the processing area, the second camera is provided on a second side surface within the processing area, The machine tool according to claim 1 or 2, wherein the second side surface faces the first side surface.

4. the plurality of cameras further includes a third camera; The machine tool according to claim 3 , wherein the second camera and the third camera are arranged side by side in the direction of gravity on the second side surface.

5. the machine tool further includes a second work spindle for supporting the workpiece from the side opposite to the first work spindle; The machine tool according to claim 1 or 2, wherein each of the plurality of cameras is disposed at a position higher than the second workpiece spindle.

Images