Machine tool

Abstract

To provide a machine tool that is able to easily confirm the phase of a tool holder attached to a tool magazine.SOLUTION: A machine tool includes a tool magazine 60, a sensor 100, and a control unit. The tool magazine 60 accommodates a plurality of tool holders 70. The sensor 100 detects in a non-contact manner a phase of each of the tool holders 70 accommodated in the tool magazine 60. Based on the phase detected by the sensor 100, the control unit determines whether the tool holder 70 is accommodated at a predetermined phase in the tool magazine 60.SELECTED DRAWING: Figure 10

Description

[Technical Field]

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

[0002] There is known a machine tool that machines a workpiece using a tool holder attached to a tool spindle unit. The machine tool includes, for example, a tool magazine that holds multiple tools and a spindle unit that rotates the tools, and inserts and removes tools between the tool magazine and the spindle unit.

[0003] The tool holder described in Patent Document 1 has a joint called a "Captoholder" attached to the end of an adapter that is attached to the spindle unit. This joint is made up of a conical hollow shaft with a non-circular cross section that is slightly triangular. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-217511 Summary of the Invention [Problem to be solved by the invention]

[0005] The tool holder described in Patent Document 1 has a joint with a non-circular cross section that is slightly triangular, so it needs to be attached to the tool magazine in the correct phase. If the tool holder described in Patent Document 1 is attached to the tool magazine in the wrong phase, there is a risk of an interference (collision) accident occurring when the tool holder is replaced because the phase of the tool holder attached to the tool magazine and the spindle unit will be different. For this reason, the worker needs to carefully attach the tool holder to the tool magazine in the correct phase.

[0006] The present invention has been made in view of the above circumstances, and has an object to provide a machine tool that allows easy confirmation of the phase of a tool holder attached to a tool magazine. [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 includes a tool magazine that stores a plurality of tool holders, a sensor that detects the phase of the tool holders stored in the tool magazine in a non-contact manner, and a control unit that determines whether the tool holders are stored in the tool magazine at a predetermined phase based on the phase detected by the sensor. [Effects of the Invention]

[0008] According to the present invention, the phase of the tool holder attached to the tool magazine can be easily confirmed. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a front view of a machine tool according to an embodiment of the present invention; [Figure 2] 1 is a plan view of a machine tool according to an embodiment of the present invention; [Figure 3] FIG. 2 is a front view of a cover that houses a machine tool according to an embodiment of the present invention. [Figure 4] 1 is a side view of a machine tool according to an embodiment of the present invention; [Figure 5] FIG. 1 is a front view of a tool magazine according to an embodiment of the present invention. [Figure 6] FIG. 1 is a side view of a tool magazine according to an embodiment of the present invention. [Figure 7] FIG. 1 is a side view showing a tool holder according to an embodiment of the present invention attached to a tool spindle unit. [Figure 8]FIG. 1( a) is a plan view showing the shape of a tool holder and a V-groove according to an embodiment of the present invention, (b) is a front cross-sectional view of the tool holder, (c) is a right side view of the tool holder according to an embodiment of the present invention, and (d) is a bottom view of the tool holder according to an embodiment of the present invention. [Figure 9] FIG. 2 is a front view of the tool spindle of the tool spindle unit according to the embodiment of the present invention. [Figure 10] FIG. 4 is an enlarged view of a phase detection position of the tool magazine according to the embodiment of the present invention. [Figure 11] 1(a) to 1(d) are diagrams showing a tool holder and a sensor according to an embodiment of the present invention. [Figure 12] 10 is a flowchart of a phase confirmation process according to an embodiment of the present invention. [Figure 13] 10(a) and 10(b) are diagrams showing a tool holder and a sensor according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a machine tool according to an embodiment of the present invention will be described with reference to the drawings.

[0011] As shown in FIG. 1, machine tool 1, which is a turning center, includes a bed S, which is a base for the entire machine tool 1, a first spindle unit 10 having a first spindle 11, a second spindle unit 20 having a second spindle 21, a first spindle movement mechanism 13Z, a second spindle movement mechanism 25, a tool spindle unit 50, a tool spindle movement mechanism 42, a magazine support member 16, a movement mechanism support member 14, a guide bush support portion 15, a tool magazine 60, a control unit 300, a sensor 100 shown in FIG. 5, and, as shown in FIG. 2, a tool spindle turning mechanism 45, a tool post 30, a tool post movement mechanism 33Y, and a chute box 18. Furthermore, as shown in FIG. 3, machine tool 1 is housed in a cover 200. Machine tool 1 is a bar processing machine for processing a workpiece W, which is a bar.

[0012] In the following, the axial direction of the rotation axes of the first main spindle 11 and the second main spindle 21 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 depth 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.

[0013] Cover 200 has a cover body 210 that houses machine tool 1, an opening 220 formed in cover body 210, a door 230 attached to opening 220, a door sensor 240 that detects whether door 230 is open or closed, and an operation panel 310 for operating machine tool 1. An operator can attach tool holder 70 to tool magazine 60 by opening door 230 attached to opening 220.

[0014] The first spindle unit 10 shown in Fig. 1 holds a workpiece W and rotates the central axis of the workpiece W in the direction of the rotation axis. The movement mechanism support member 14 is installed on the upper surface of the bed S and supports the first spindle movement mechanism 13Z. The first spindle movement mechanism 13Z moves the first spindle unit 10 in the Z-axis direction. A guide bush device 90 is removably attached to the guide bush support part 15.

[0015] The second spindle unit 20 shown in FIG. 1 is provided at a position facing the first spindle unit 10 in the Z-axis direction, and rotates the workpiece W in the direction of its rotation axis, with the central axis of the workpiece W as the rotation axis.

[0016] As shown in FIG. 1, the tool spindle moving mechanism 42 includes a Y-movement mechanism 42Y that moves the tool spindle unit 50 in the Y-axis direction, and as shown in FIG. 2, an X-movement mechanism 42X that moves the tool spindle unit 50 in the X-axis direction, and a Z-movement mechanism 42Z that moves the tool spindle unit 50 in the Z-axis direction.

[0017] As shown in FIGS. 1 and 4, the tool spindle turning mechanism 45 turns the tool holder 70 attached to the tool spindle unit 50 around a central axis of rotation J in the X-axis direction.

[0018] As shown in Fig. 6, tool spindle unit 50 is equipped with a tool gripping mechanism 55, and a tool holder 70 is detachably attached to it. Tool spindle unit 50 is located between first spindle unit 10 and second spindle unit 20 in the Z-axis direction. Tool spindle unit 50 uses the attached tool holder 70 to machine workpiece W held by first spindle unit 10 or second spindle unit 20.

[0019] As shown in FIG. 7 , the tool gripping mechanism 55 includes a main body 55a and a clamp 55b. The clamp 55b is attached to the lower end of the main body 55a. The clamp 55b is disposed around the rotation axis of the main body 55a and includes multiple claws 55c that open and close radially as the main body 55a moves in the Z-axis direction. When the tool gripping mechanism 55 moves in the Z-axis direction, the main body 55a also moves in the Z-axis direction in conjunction with the movement of the main body 55a in the Z-axis direction. When the main body 55a moves in the Z-axis direction, the claws 55c come into contact with the recesses 72d in the inner wall 72c of the tool holder 70, and the clamp 55b clamps the tool holder 70. When the tool gripping mechanism 55 moves in the −Z-axis direction, the tool holder 70 is placed in an unclamped state.

[0020] The tool rest 30 shown in FIG. 4 is configured so that a plurality of tools 35 for machining the workpiece W held by the second spindle unit 20 can be attached thereto.

[0021] 1 has a motor and rotates the tool support part 61 about a rotation axis Az. The drive part 62 is supported by the magazine support member 16.

[0022] The tool magazine 60 includes a tool support portion 61 and a drive portion 62, and is located above the first spindle 11 when the first spindle 11 is closest to the guide bush device 90. The tool magazine 60 is supported by a magazine support member 16. The magazine support member 16 is formed as a support frame extending in the Y-axis direction, and is fixed to the top surface of the bed S on the far side of the first spindle unit 10. The tool support portion 61 of the tool magazine 60 has a substantially annular shape, and is supported rotatably about a rotation axis Az extending in the Z-axis direction.

[0023] As shown in FIGS. 1, 5, and 6, the tool magazine 60 stores tool holders 70 containing multiple types of tools, and transfers the tool holders 70 to and from the tool spindle unit 50. Specifically, under the control of the control unit 300, the drive unit 62 rotates the tool support unit 61 to move the tool holder 70 supported by the tool gripper 65 to the tool change position Pc. Then, the tool spindle unit 50 is moved in the Z-axis direction toward the tool holder 70 supported by the tool gripper 65 via the tool spindle movement mechanism 42 to mount the tool holder 70 on the tool spindle unit 50, and the tool holder 70 is switched to a clamped state by the tool spindle unit 50. This allows the tool spindle unit 50 to receive the tool holder 70 from the tool magazine 60. Then, under the control of the control unit 300, the tool spindle unit 50 is moved radially outward from the tool support unit 61 via the tool spindle movement mechanism 42 to remove the tool holder 70 from the tool gripper 65. Next, the tool spindle unit 50 is moved away from the tool support part 61 in the Z-axis direction via the tool spindle moving mechanism 42. With the above steps, the tool holder 70 is attached to the tool spindle unit 50 as shown in Fig. 7. More specifically, the shank part 72 shown in Figs. 8(a) to 8(c) is fitted into the attachment hole 52 of the tool spindle 51 shown in Fig. 9, thereby attaching the tool holder 70 to the tool spindle unit 50.

[0024] As shown in FIGS. 8(a) to 8(d), the tool holder 70 has a flange portion 71 that is held by the tool magazine 60, a shank portion 72 that is attached to the tool spindle unit 50, a hole 73 formed in the shank portion 72, and a tool 74 that machines the workpiece W. The tool holder 70 has a standard shape determined by international standards, with the hole 73 and recess 72a in the shank portion 72. The tool holder 70 has a triangular apex on the opposite side of the hole 73 and recess 72a in the shank portion 72, and four equally spaced V-grooves 71a formed in the flange portion 71 at an angle of 45 degrees from the recess 72a. The apexes of the triangle are equally spaced at 60 degrees, so the phases of the apexes of the triangle relative to each V-groove 71a are different.

[0025] The flange portion 71 is the portion that is gripped by the tool gripping portion 65, and has four equally spaced V-grooves 71a that correspond to the guide rods of the tool gripping portion 65 of the tool magazine 60. The V-grooves 71a extend in the circumferential direction and are portions into which the guide rods 65a of the tool gripping portion 65 fit. Each V-groove 71a also has two side surfaces 71c and a bottom surface 71d. The two side surfaces 71c are aligned in the axial direction, face each other, and incline so as to move away from each other as they extend radially outward. The bottom surface 71d connects the lower ends of the two side surfaces 71c.

[0026] The shank portion 72 is a portion that is attached to the tool spindle 51 of the tool spindle unit 50, and has a tapered shape in which the flange side of the rounded triangle (polygon) is larger than the tip side, and a hole 73 and a recess 72a are formed at a "predetermined phase." The shank portion 72 is hollow, and has an outer wall 72b and an inner wall 72c. In this example, the shank portion 72 is called a "capto holder" and has a non-circular cross section that is slightly triangular. The recess 72a is used to accurately align the phase of the tool holder 70 with that of the tool spindle 51 of the tool spindle unit 50. The tool spindle 51 shown in FIG. 9 has a mounting hole 52 into which the shank portion 72 fits, and a threaded hole 53 that is provided in the mounting hole 52 and into which a positioning pin that is inserted into the recess 72a is attached. Furthermore, when the tool holder 70 is mounted on the tool spindle 51 of the tool spindle unit 50, it is mounted by two-surface restraint, with the shank portion 72 and the end face 71b of the flange portion 71 making face-to-face contact with the tool spindle 51. This increases axial rigidity, suppresses chatter during machining, and improves tool life and finished surface accuracy. Furthermore, because the end face 71b of the flange portion 71 comes into contact with the end face of the tool spindle 51 of the tool spindle unit 50, the axial positioning accuracy of the tool holder 70 is improved.

[0027] The hole 73 is provided so as to pass from the outer wall 72b to the inner wall 72c of the shank portion 72. When coolant is used using the hole 73, the coolant introduced from the outside passes through the hole 73 into the tool holder 70 and is discharged from the tip of the tool 74. In this embodiment, when the tool holder 70 is attached to the tool spindle 51, the hole 73 is closed by the tool spindle 51 and is not used to discharge the coolant.

[0028] The tool 74 includes a fixed tool such as a turning tool, or a plurality of types of rotary tools such as a milling tool. The turning tool or the like is attached to the tool holder 70 at a predetermined phase as required.

[0029] 5, the tool support part 61 includes a plurality of tool gripping parts 65. The plurality of tool gripping parts 65 are located on the outer periphery of the tool support part 61 and are arranged side by side in the rotation direction of the tool support part 61.

[0030] As shown in FIG. 10, the tool gripping portion 65 includes two guide rods 65a, a receiving portion 65b, and a leaf spring 65c. When storing the tool holder 70 in the tool gripping portion 65 of the tool magazine 60, the tool holder 70 is oriented in the Z-axis direction and attached by fitting the flange portion 71 of the tool holder 70 into the U-shaped groove that opens radially outward in the tool gripping portion 65.

[0031] In detail, the worker opens two of the four evenly spaced V-grooves 71a of the tool holder 70 by opening the rounded portions at the tips of the leaf springs 65c on both sides of the tool gripping portion 65, and guides them along the two guide rods 65a connected to the receiving portion 65b of the tool gripping portion 65 of the tool magazine 60, and places them against the receiving portion 65b of the tool gripping portion 65. Thereafter, the flange portions 71 of the tool holder 70 are pressed against the receiving portions 65b by the spring force of the leaf springs 65c on both sides of the tool gripping portion 65, and the tool holder 70 is attached to the tool gripping portion 65.

[0032] When attaching the tool holder 70, the tool gripping part 65 has two guide rods 65a, while the tool holder 70 has four V-grooves 71a. Therefore, as shown in Figures 11(a) to 11(d), the tool holder 70 can be attached in four phases by rotating it by 90 degrees.

[0033] As shown in FIG. 9, the mounting hole 52 of the tool spindle 51 of the tool spindle unit 50 has a triangular shape that is the same as the triangular shape of the shank portion 72 of the tool holder 70. Therefore, when changing a tool, the triangle of the mounting hole 52 of the tool spindle 51 and the triangle of the shank portion 72 of the tool holder 70 must be aligned in order for the tool to be mounted. In other words, if they are not aligned, there is a risk of an interference (crash) accident occurring, so the tool holder 70 needs to be attached to the tool gripping portion 65 in a "predetermined phase."

[0034] Therefore, the tool holder 70 must be attached at the tool holder attachment position Pb so that, by visual inspection, the apex of the triangle of the shank portion 72 of the tool holder 70 faces upward and the hole 73 faces downward at the phase detection position Pd, resulting in the "predetermined phase" shown in FIG. 11(a).

[0035] In this way, the attachment of the tool holder 70 to the tool gripping portion 65 of the tool magazine 60 is the same as in the conventional technology, which is carried out visually by the operator, so there is a risk that the tool holder 70 will be attached to the tool magazine 60 in the wrong phase.

[0036] When the tool support portion 61 is rotated and the tool holder 70 is positioned at the tool changing position Pc, the tool spindle 51 is rotated so that the triangle of the mounting hole 52 of the tool spindle 51 matches the triangle of the shank portion 72 of the tool holder 70.

[0037] The sensor 100 detects the hole 73 or recess 72a provided in the shank portion 72 to non-contactly detect whether the tool holder 70 stored in the tool magazine 60 is attached in a "predetermined phase." As shown in FIG. 10, the sensor 100 includes a light projecting unit 101, a light receiving unit 102, an air blowing unit 103, and a fixing member 104. The sensor 100 is attached by a fixing member 104 near the tool magazine 60, on the inner wall of the cover body 210 shown in Figure 3, so as to be located below the hole 73 or recess 72a provided in the shank portion 72 of the tool holder 70.

[0038] Light projecting unit 101 includes a semiconductor laser that irradiates a target object with laser light. Light projecting unit 101 emits laser light with a narrow spread, allowing the light to pass through hole 73 provided in shank 72. This results in high measurement accuracy, enabling accurate phase confirmation.

[0039] The light receiving unit 102 measures the distance by reading the reflected light of the laser light irradiated on the object to be measured using a light receiving element, and measures the distance based on the principle of triangulation.

[0040] 10 supplies air for blowing to remove dirt from the light projecting unit 101 and the light receiving unit 102. Before measurement, the light projecting unit 101 and the light receiving unit 102 of the sensor 100 may be cleaned by spraying air onto them with the air blower.

[0041] The sensor 100 measures the distance to the measurement target and outputs data indicating the measured distance to the control unit 300. The control unit 300 receives the data indicating the distance to the measurement target measured by the sensor 100. If the measured distance is longer than a reference distance L0, the control unit 300 determines that the hole 73 in the shank portion 72 has been detected. If the measured distance is shorter than the reference distance L0, the control unit 300 determines that the hole 73 in the shank portion 72 has not been detected. The reference distance L0 is, for example, preset to the distance from the sensor 100 to the rotation axis of the tool holder 70. In the example shown in FIG. 11(a), the laser light passes through the hole 73 and is reflected by the inner wall 72c of the shank portion 72. Therefore, the sensor 100 measures the distance to the measurement target as L1. Since the distance L1 is longer than the reference distance L0, the control unit 300 determines that the hole 73 in the shank portion 72 has been detected. In this case, the tool holder 70 is determined to be attached in the "predetermined phase." 11(b) to 11(d), the sensor 100 measures the distance to the measurement object as distances L2 to L4 because the laser light is reflected by the outer wall 72b of the shank portion 72, and the control unit 300 determines that the distances L2 to L4 are shorter than the reference distance L0 and therefore does not detect the hole 73 provided in the shank portion 72. In this case, it is determined that the tool holder 70 is not attached at the "predetermined phase."

[0042] 1 controls the first spindle unit 10, the second spindle unit 20, the first spindle movement mechanism 13Z, the second spindle movement mechanism 25, the tool post 30, the tool post movement mechanism 33Y, the tool spindle unit 50, the tool spindle movement mechanism 42, the tool spindle turning mechanism 45, and the tool magazine 60. The control unit 300 includes a central processing unit (CPU) (not shown), a read-only memory (ROM) that stores a program defining the processing procedures to be performed by the CPU, and a random access memory (RAM) that stores data indicating the distance to the measurement target measured by the sensor 100. The operation panel 310 is used to operate the control unit 300 and includes a touch panel display device that includes an LCD (liquid crystal display) that displays images required for operation and a touch panel that accepts user input.

[0043] Next, the phase confirmation process executed by the control unit 300 will be described.

[0044] When the worker opens the door 230 to store the tool holder 70 in the tool magazine 60, the control unit 300 receives a signal from the door sensor 240 indicating that the door 230 has been opened, and performs an interlock to prevent the tool change process of attaching the tool holder 70 to the tool spindle unit 50 from being performed. Then, the control unit 300 performs a phase confirmation process according to the flowchart shown in FIG. 12.

[0045] Specifically, the worker manually stores the tool holder 70 in a predetermined position (address) in the tool magazine 60. A predetermined number (address) is assigned to each position in advance, and the machining program selects the required tool holder 70 from the required address, performs machining, and then returns it to the same address after machining.

[0046] The control unit 300 determines whether the door 230 is closed or not (step S101) based on whether a signal indicating that the door 230 is closed is received or not from the door sensor 240. If it is determined that the door 230 is not closed (step S101; No), the control unit 300 repeats step S101.

[0047] When the worker stores the tool holder 70 in a predetermined position (address) in the tool magazine 60 and closes the door 230, the control unit 300 determines that the door 230 is closed (step S101; Yes), and displays an image on the operation panel 310 indicating that it has accepted an instruction to start the phase confirmation process (step S102).

[0048] The control unit 300 determines whether or not an instruction to start the phase confirmation process has been given by the operator via the operation panel 310 (step S103). If it is determined that an instruction to start has not been given (step S103; No), the control unit 300 repeats step S103.

[0049] When the control unit 300 determines that a start instruction has been issued (step S103; Yes), it sets the argument n to 1 (step S104). Note that the argument n is a number indicating the position (address) of the tool magazine 60.

[0050] Next, the control unit 300 determines the phase of the tool holder 70 stored in the nth position (address) (step S105). Specifically, the control unit 300 rotates the tool support unit 61 via the drive unit 62 to rotate the tool gripping unit 65, to which the nth tool holder 70 is attached, to the phase detection position Pd (see FIG. 5), and determines the phase of the nth tool holder 70. For example, if the argument n is set to 1 in step S104, the phase of the first tool holder 70 is determined. Next, the sensor 100 measures the distance to the measurement target and transmits data indicating the distance to the control unit 300. The control unit 300 receives the data indicating the distance to the measurement target measured by the sensor 100 and determines the phase of the nth tool holder 70.

[0051] Next, when the control unit 300 determines that the phase of the tool holder 70 stored in the nth position (address) is an incorrect phase (step S105; NG), it displays on the operation panel 310 a message that the tool holder 70 stored in the nth position (address) is in an incorrect phase (step S106).

[0052] The worker checks the display on the operation panel 310, opens the door 230, and corrects the phase of the tool holder 70 stored in the nth position (address) that is not installed in the "predetermined phase" (step S107). After that, the process returns to step S101, and steps S101 to S105 are executed.

[0053] When the control unit 300 determines that the phase of the n-th tool holder 70 is correct (step S105; OK), it determines whether n=30 or not (step S108). 30 is the total number of tool holders 70 stored in the tool magazine 60.

[0054] If the control unit 300 determines that n is not 30 (step S108; No), it increments the argument n by 1 (step S109) and returns to step S105.

[0055] When the control unit 300 determines that n=30 (step S108; Yes), it determines that the phases of all the tool holders 70 are all "predetermined phases."

[0056] Next, the control unit 300 releases the interlock (step S110), which allows the tool change process to be performed, in which the tool holder 70 is attached to the tool spindle unit 50, and ends the phase confirmation process.

[0057] Next, a description will be given of the processing executed by the control unit 300. The control unit 300 executes this processing in accordance with a processing program created in advance.

[0058] 1, the control unit 300 supplies the workpiece W from the rear of the first spindle unit 10 using a workpiece supply unit (not shown). Then, the control unit 300 performs a first machining operation on the workpiece W held by the first spindle 11 while changing the tool holder 70 attached to the tool spindle unit 50.

[0059] Next, the control unit 300 moves the second spindle 21 via the second spindle moving mechanism 25 to a position opposite the first spindle 11, and transfers the workpiece W that has undergone the first machining from the first spindle 11 to the second spindle 21. Then, the control unit 300 performs the second machining on the workpiece W held by the second spindle 21 using the tool 35 attached to the tool rest 30. Note that the second machining may be performed while replacing the tool holder 70 attached to the tool spindle unit 50.

[0060] Then, when the second machining is completed, the control unit 300 discharges the workpiece W that has been subjected to the second machining and is held by the second spindle 21 to the outside via a workpiece conveyor, unloader, or the like (not shown).

[0061] This completes the machining process. This machining process is repeatedly executed every time a workpiece W is supplied.

[0062] (effect) According to the embodiment described above, the following effects are achieved. (1) The sensor 100 can detect the phase of the tool holder 70 housed in the tool magazine 60 in a non-contact manner, thereby preventing interference accidents due to incorrect installation of the tool holder 70. Furthermore, the sensor 100 automatically checks the phase after the tool holder 70 is installed, thereby reducing the burden on the worker when installing the tool holder 70. Furthermore, the function can be achieved with a simple structure in which the sensor 100 is installed with the fixing member 104. Because the phase of the tool holder 70 is detected in a non-contact manner, there is little risk of damaging the tool holder 70, and the response is fast, so the phase can be confirmed in a short time. (2) The shape of a commonly used tool holder 70 is a standard shape determined by international standards, etc., and has a hole 73 and a recess 72a in a shank portion 72. The hole 73 can be used to check the phase, so the phase can be checked using a standard tool holder as is. (3) Since the phases of the tool holders 70 attached to all positions (addresses) of the tool magazine 60 can be confirmed, it can be confirmed that the phases of the tool holders 70 at all positions are correctly matched. (4) When the door 230 is opened, it is possible that the tool holder 70 has been replaced, etc. Therefore, the door sensor 240 determines whether the door 230 is closed, and when the door 230 is closed, the phase of the tool holder 70 is automatically checked, thereby preventing the operator from forgetting to check the phase of the tool holder 70. (5) If there is a tool holder 70 that is determined not to be attached in the "predetermined phase," the position (address) of the tool magazine 60 where the tool holder 70 that is determined not to be attached in the "predetermined phase" is attached is displayed on the operation panel 310, so that the attachment position of the tool holder 70 in the incorrect phase can be determined and correction can be easily made. (6) When a signal indicating that the door 230 is open is received from the door sensor 240, an interlock is activated to prevent the tool change process of attaching the tool holder 70 to the tool spindle unit 50 from being executed. If the phases of all the tool holders 70 are correct, the interlock is released, thereby preventing interference accidents when changing the tool holders 70.

[0063] 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.

[0064] (Variation) In the above embodiment, the machine tool 1 includes the first spindle unit 10 and the second spindle unit 20, but either the first spindle unit 10 or the second spindle unit 20 may be omitted.

[0065] The movement directions of the second spindle unit 20, the tool spindle unit 50, the first spindle unit 10 and the tool rest 30 in the above embodiment can be changed as appropriate.

[0066] In the above embodiment, an example has been described in which the sensor 100 includes the light-projecting unit 101 including a semiconductor laser that irradiates a laser beam onto an object to be measured, and the light-receiving unit 102 that receives reflected light of the laser beam irradiated onto the object to be measured. The sensor 100 is not particularly limited as long as it detects the phase of the tool holder 70 housed in the tool magazine 60 in a non-contact manner. 13(a), the sensor 100 may include a camera 105 that captures an image of the tool holder 70. In this case, the control unit 300 analyzes the image captured by the camera 105 to detect the phase of the tool holder 70. Specifically, the control unit 300 can detect the phase of the tool holder 70 by detecting the hole 73 or the recess 72a provided in the shank portion 72. The mounting position of the sensor 100 is not particularly limited as long as it can detect the phase of the tool holder 70 in a non-contact manner, and the sensor 100 may be disposed on the rotation axis of the tool holder 70 as shown in Fig. 13(b). In this manner, the control unit 300 can detect the phase of the tool holder 70 by detecting the recess 72a provided in the shank portion 72.

[0067] In the above embodiment, an example was described in which the tool holder 70 includes a flange portion 71 having four equally spaced V-grooves 71a and a shank portion 72 called a "capto holder" having a non-circular cross section that is slightly triangular. The shape of the tool holder 70 is not particularly limited. The shank portion 72 may have a non-circular cross section that is rectangular, pentagonal, or hexagonal. The flange portion 71 may also have six equally spaced V-grooves 71a.

[0068] In the above embodiment, an example has been described in which the positions (addresses) of the tool magazines 60 that are not installed in the "predetermined phase" are displayed on the operation panel 310 each time a tool holder 70 determined not to be installed in the "predetermined phase" is detected. However, the method of notifying the operator is not particularly limited. For example, it may be determined for each tool holder 70 whether or not they are installed in the "predetermined phase," and the positions (addresses) of the tool magazines 60 that are not installed in the "predetermined phase" may be displayed on the operation panel 310 as the determination result. Furthermore, when it is determined that all tool holders 70 are installed in the "predetermined phase," the detection result that all tool holders 70 are installed in the "predetermined phase" may be displayed on the operation panel 310. Furthermore, whether or not there is a tool holder 70 in the wrong phase, or the installation positions of the tool holders 70 in the wrong phase, may be notified by sound or voice. [Explanation of symbols]

[0069] 1...machine tool, 10...first spindle unit, 11...first spindle, 12...first headstock, 13...support member, 13Z...first spindle movement mechanism, 14...movement mechanism support member, 15...guide bush support portion, 16...magazine support member, 20...second spindle unit, 21...second spindle, 22...second headstock, 25...second spindle movement mechanism, 42X...X movement mechanism, 42Y...Y movement mechanism, 42Z...Z movement mechanism, 29...rail, 30...turret, 35...tool, 42...tool spindle movement mechanism, 45...tool spindle swivel mechanism, 50...tool spindle unit, 51...tool spindle, 52...mounting hole, 55...tool gripping mechanism portion, 55a...main body portion, 55b...clamp portion, 55c...jaw portion, 60...tool magazine, 61...tool support portion, 65... Tool gripping portion, 65a... guide rod, 65b... receiving portion, 65c... leaf spring, 70... tool holder, 71... flange portion, 71a... V-groove, 71b... end face, 71c... side face, 71d... bottom face, 72... shank portion, 72a... recess, 72b... outer wall, 72c... inner wall, 72d... recess, 73... hole, 74... tool, 100... sensor, 101... light-emitting portion, 102... light-receiving portion, 103... air blow portion, 104... fixing member, 105... camera, 200... cover, 210... cover body, 220... opening, 230... door, 240... door sensor, 300... control portion, 310... operation panel, S... bed, W... workpiece, Pb... tool holder mounting position, Pc... tool change position, Pd... phase detection position, L0... reference distance, L1 to L4... distances

Claims

1. a tool magazine that accommodates a plurality of tool holders; a sensor that detects the phase of the tool holder contained in the tool magazine in a non-contact manner; a control unit that determines whether the tool holder is accommodated in the tool magazine at a predetermined phase based on the phase detected by the sensor; A machine tool equipped with:

2. the tool holder has a flange portion gripped by the tool magazine, a shank portion attached to a tool spindle unit, and a hole or a recess provided in the shank portion, the control unit determines that the tool holder is attached in a predetermined phase when the sensor detects the hole or the recess provided in the shank portion. The machine tool according to claim 1.

3. the control unit controls the tool magazine, moves the tool holders accommodated in the respective positions of the tool magazine to detection positions where the sensors detect their phases, causes the sensors to detect the phases of the tool holders, and determines whether the tool holders are accommodated in the tool magazine at a predetermined phase based on the phases detected by the sensors.

3. The machine tool according to claim 1 or 2.

4. a cover including a cover body that houses the tool magazine and the sensor, an opening formed in the cover body, a door attached to the opening, and a door sensor that detects opening and closing of the door, the control unit causes the door sensor to detect the phase of the tool holder when the door sensor detects that the door is closed.

3. The machine tool according to claim 1 or 2.

5. When the control unit determines that the tool holder is not attached at a predetermined phase, the control unit notifies the position of the tool magazine in which the tool holder that is not attached at the predetermined phase is attached.

3. The machine tool according to claim 1 or 2.

6. when it is determined that the tool holders attached to all positions in the tool magazine have been attached at a predetermined phase, the control unit executes control to attach the tool holders to a tool spindle unit. The machine tool according to claim 3.

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