JP7398295B2 - Tool breakage detection system and machine tools - Google Patents

Description

The present invention relates to a tool breakage detection device, a tool breakage detection system, and a machine tool.

For example, the processing device described in Patent Document 1 includes a table that moves in the X direction and the Y direction, a positioning table that positions and fixes a workpiece provided on the table, and a processing device that detects breakage of a processing tool provided on the table. and a tool detection switch. By moving the table, the tool detection switch is positioned at the detection position and the processing tool is lowered. At this time, whether or not the processing tool is broken is detected depending on whether or not the tool detection switch is pressed.

Japanese Patent Application Publication No. 2011-70295

In the configuration described in Patent Document 1, the tool detection switch is provided on the table to which the workpiece is fixed. Therefore, the tool detection switch is located in or near the tooling zone where the workpiece is processed by the processing tool. Therefore, there is a risk that chips, coolant fluid, vibrations, etc. generated during machining of a workpiece with a machining tool may reach the tool detection switch, thereby adversely affecting detection by the tool detection switch.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a tool breakage detection device, a tool breakage detection system, and a machine tool that can more accurately detect the presence or absence of tool breakage.

In order to achieve the above object , a tool breakage detection system according to a first aspect of the present invention includes a tool breakage detection device, a tool that is transported in a direction along the cutting edge of the tool, and a tool that is stopped while the tool is being transported. A tool breakage detection system comprising: a tool exchange transport unit that stops movement of the tool at a position, wherein the tool breakage detection device is removed from a tool unit that processes a workpiece and is transported through the tool exchange transport unit. a detection unit that detects whether or not the tool is broken outside the tooling zone ; a needle support unit; a detection needle supported by the needle support unit; and a needle drive unit that rotates the detection needle. , the tool breakage detection system sets the stop position so that the blade part of the tool is at a position corresponding to the detection needle according to the length along the blade part of the tool, and the tool exchange transportation a control unit for stopping the tool at the set stop position through a control unit , the detection needle of the tool breakage detection device being rotatable along a direction intersecting the blade part of the tool at the stop position; and the detection unit of the tool breakage detection device detects that the tool is not broken when the rotation of the detection needle by the needle drive unit is limited by the tool conveyed by the tool exchange conveyance unit. However, when the rotation of the detection needle is not restricted by the tool conveyed by the tool exchange conveyance section, it is detected that the tool is broken .

In order to achieve the above object, a machine tool according to a second aspect of the present invention includes the tool breakage detection system, a spindle unit that grips the workpiece, and the tool that processes the workpiece gripped by the spindle unit. It is equipped with a unit .

According to the present invention, the presence or absence of tool breakage can be detected more accurately in a tool breakage detection device, a tool breakage detection system, and a machine tool.

1 is a schematic front view of a machine tool according to an embodiment of the present invention. 1 is a schematic side view of a machine tool according to an embodiment of the present invention. 1 is a schematic plan view of a machine tool according to an embodiment of the present invention. FIG. 1 is a partially enlarged schematic plan view of a machine tool according to an embodiment of the present invention. It is a flowchart of tool exchange processing concerning one embodiment of the present invention.

A tool breakage detection device, a tool breakage detection system, and a machine tool according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the machine tool 1 is an NC (Numerical Control) lathe that processes a workpiece W. As shown in FIG. Specifically, the machine tool 1 includes a bed S, which is a base for the entire machine tool 1, a spindle unit 10, a tool spindle 20, and a tool breakage detection system 5.
As shown in FIG. 3, the tool breakage detection system 5 includes a tool exchange transport section 3 that exchanges and transports the tool TL mounted on the tool spindle 20, a tool breakage detection device 60, and a control section 300. The tool exchange transport unit 3 includes a tool exchange device 30, a tool transport device 40, and a tool magazine device 50.

As shown in FIG. 1, the spindle unit 10 grips a workpiece W and rotates the gripped workpiece W around a rotation axis along the Z-axis direction. The spindle unit 10 includes a spindle 11 that grips the work W, a spindle 15 that rotatably supports the spindle 11, and a spindle moving mechanism (not shown) that moves the spindle 15 together with the spindle 11 in the Z-axis direction. .

As shown in FIG. 3, the tool spindle 20, tool exchange device 30, tool transport device 40, tool magazine device 50, and tool breakage detection device 60 are arranged above the spindle unit 10 along the Z-axis direction. A tool changer 30, a tool transport device 40, and a tool breakage detection device 60 are arranged between the tool spindle 20 and the tool magazine device 50.
As shown in FIG. 1, the tool spindle 20 is positioned facing the workpiece W gripped by the spindle unit 10 in the Y-axis direction, which is the height direction. The tool magazine device 50 is located at a rear portion of the spindle unit 10 opposite to the spindle 11 so as to face each other in the Y-axis direction.

As shown in FIG. 1, the tool spindle 20 processes the workpiece W gripped by the spindle unit 10 in the tooling zone TZ. The tooling zone TZ is set in an area centered on the workpiece W gripped by the spindle unit 10, and is set in an area where chips, coolant liquid, etc. generated due to machining of the workpiece W by the tool spindle 20 are expected to reach. be done.
The tool spindle 20 is capable of attaching and detaching the tool TL, and under the control of the control unit 300, rotates the attached tool TL and can move in the X-axis direction, Y-axis direction, and Z-axis direction that are orthogonal to each other. and is configured to be able to turn around a turning axis B along the X-axis direction. The tool spindle 20 enters the tooling zone TZ from the exchange position Ps and then processes the workpiece W. The exchange position Ps is located outside the touring zone TZ and above the touring zone TZ, and is set at a position where the tool TL can be exchanged by the tool exchange device 30.

As shown in FIG. 3, the tool changer 30 is located between the tool spindle 20 and the tool transport device 40 in the Z-axis direction. As shown in FIG. 1, the tool exchange device 30 exchanges the tool TL mounted on the tool spindle 20. The tool changer 30 includes a rotating shaft portion 31 and arm portions 32 and 33. The rotating shaft portion 31 is formed in a cylindrical shape extending in the Y-axis direction, and is provided so as to be rotatable about a rotating shaft 31J along the Y-axis direction by a motor (not shown). The arm portions 32 and 33 each extend toward the outside in the radial direction of the rotating shaft portion 31. The arm portions 32 and 33 are arranged around the rotating shaft portion 31 at intervals of 180°. The arm portions 32 and 33 rotate together with the rotation shaft portion 31 around the rotation shaft 31J. The arm parts 32 and 33 are provided at the same height as the tool TL mounted on the tool spindle 20 located at the exchange position Ps. The tip portions of each of the arm portions 32 and 33 are formed to be able to grip the tool TL.

As shown in FIGS. 2 and 3, the tool transport device 40 receives the tool TL removed from the tool spindle 20 by the tool exchange device 30, and transports the received tool TL to the tool magazine device 50. Further, the tool transport device 40 stops the movement of the tool TL so that the tool breakage detection device 60 can detect whether or not the tool TL is broken while the tool TL is being transported. As shown in FIG. 3, the tool transport device 40 is located between the tool exchange device 30 and the tool magazine device 50 in the Z-axis direction.
The tool transport device 40 includes a tool holding section 43 that holds the tool TL, a Y-axis moving mechanism 41Y (see FIG. 2), and a Z-axis moving mechanism 41Z (see FIG. 3).
As shown in FIG. 2, the tool holding part 43 holds the tool TL so that the blade part TLa of the tool TL is along the Y-axis direction and the cutting edge of the blade part TLa faces the bed S.

As shown in FIG. 2, the Y-axis moving mechanism 41Y moves the tool holder 43 between the lower position YL and the upper position YH in the Y-axis direction. The lower position YL is set so that the tool TL held by the tool holding section 43 is at the same height as the arm sections 32 and 33 of the tool exchange device 30 and the grip section 52a of the tool magazine device 50, which will be described later. The upper position YH is set so that the tool TL held by the tool holding part 43 is at the same height as a grip part 51a of the tool magazine device 50, which will be described later. Further, the Y-axis moving mechanism 41Y stops the movement of the tool holder 43 in the Y-axis direction at a stop position YS between the lower position YL and the upper position YH. The stop position YS is set at a position where the blade portion TLa of the tool TL held by the tool holder 43 is at the same height as a detection needle 62 of the tool breakage detection device 60, which will be described later. As will be described later, the stop position YS is set by the control unit 300 according to the length of the blade portion TLa of the tool TL in the Y-axis direction. The Y-axis moving mechanism 41Y is fitted into, for example, a motor 41a, a ball screw 41b that is rotated by the motor 41a, and the ball screw 41b, and moves in the Y-axis direction along the ball screw 41b together with the tool holder 43. and a nut 41c.

As shown in FIG. 3, the Z-axis moving mechanism 41Z moves the Y-axis moving mechanism 41Y and the tool holding part 43 between the arm facing position ZL and the magazine gripping part facing position ZR in the Z-axis direction. The arm facing position ZL is a position overlapping either of the arm parts 32 and 33 in the Y-axis direction, and the tool holding part 43 can exchange the tool TL with either of the arm parts 32 and 33 of the tool exchange device 30. This is the position where The magazine gripping portion opposing position ZR is a position overlapping gripping portions 51a and 52a of the magazines 51 and 52, which will be described later, in the Y-axis direction, and the tool holding portion 43 is able to transfer and receive the tool TL between the gripping portions 51a and 52a. It is a position where
The Z-axis moving mechanism 41Z is fitted into, for example, a motor 41d, a ball screw 41e rotated by the motor 41d, and the ball screw 41e, and moves in the Z-axis direction along the ball screw 41e together with the tool holder 43. A nut 41f is provided.

As shown in FIG. 1, the tool magazine device 50 accommodates a plurality of tools TL that can be taken in and out by the tool transport device 40 (see FIG. 2). The tool magazine device 50 is located above the end of the spindle unit 10 on the side opposite to the spindle 11 . The tool magazine device 50 includes two magazines 51 and 52, a magazine drive motor 53, a magazine support shaft 55, a support column 54, and a support frame 56.
Magazines 51 and 52 are each formed into a disk shape. The magazines 51 and 52 have U-shaped gripping parts 51a and 52a that are arranged along the outer periphery of the magazines 51 and 52, respectively, and grip the tool TL. The two magazines 51 and 52 are arranged so as to overlap in the Y-axis direction, and are rotatably supported by a magazine support shaft 55 about a magazine rotation axis 50J along the Y-axis direction. The support frame 56 extends along the X-axis direction and the Z-axis direction, and is located above the headstock 15 of the spindle unit 10. A magazine support shaft 55 and a column 54 are fixed to the upper surface of the support frame 56. The magazine drive motor 53 is located at the upper end of the magazine support shaft 55, and rotates the magazines 51 and 52 around the magazine rotation shaft 50J.
The support column 54 extends along the Y-axis direction and is provided at a position with a gap between the outer peripheries of the magazines 51 and 52. The support column 54 is provided to support a cover (not shown) that covers the periphery of the tool magazine device 50. As shown in FIG. 3, the support column 54 is provided with a gap in the X-axis direction with respect to the tool holding section 43 of the tool transport device 40. A tool breakage detection device 60 is fixed to the support column 54.

As shown in FIG. 4, the tool breakage detection device 60 is located between the tool exchange device 30 and the magazines 51 and 52 in the Z-axis direction. Further, the tool breakage detection device 60 is configured such that a detection needle 62 (described later) of the tool breakage detection device 60 is held by the tool holder 43 in the X-axis direction while avoiding the moving path R1 of the tool holder 43 in the Z-axis direction. It is provided at a position where the tool TL can be reached.
As shown in FIGS. 2 and 4, the tool breakage detection device 60 detects whether or not the tool TL held by the tool holder 43 whose movement has stopped at the stop positions YS and ZS is broken.
The tool breakage detection device 60 includes a needle support section 61, a detection needle 62, a detection section 63a, a needle drive section 63b, and a fixture 64. The needle support portion 61 is formed in a cylindrical shape extending in the Y-axis direction. The end of the linearly extending detection needle 62 is rotatably supported by the upper end of the needle support section 61. The needle drive section 63b rotates the detection needle 62 around the needle support section 61. The detection unit 63a detects whether or not the tool TL is broken by determining whether or not the rotation of the detection needle 62 is restricted by the blade portion TLa of the tool TL1. For example, the detection unit 63a is an angle detection sensor that detects the angle of the detection needle 62. The detection unit 63a outputs the result of detecting whether or not the tool TL is broken to the control unit 300. The fixing fitting 64 fixes the needle support part 61 to the support column 54.

The control unit 300 controls the operation of each part of the machine tool 1. The control unit 300 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The control unit 300 controls the spindle unit 10, the tool spindle 20, the tool changer 30, the tool transport device 40, the tool magazine device 50, and the tool breakage detection device 60 through numerical control.

Next, the tool exchange process executed by the control unit 300 will be described with reference to the flowchart in FIG. 5.
First, the control unit 300 processes the workpiece W gripped by the spindle unit 10 via the tool TL mounted on the tool spindle 20 in the tooling zone TZ (step S101).

Then, the control unit 300 determines whether or not the tool TL mounted on the tool spindle 20 needs to be replaced (step S102). When the control unit 300 determines that the tool TL does not need to be replaced (step S102; NO), the control unit 300 returns to step S101 and continues machining with the tool TL mounted on the tool spindle 20.

On the other hand, when the control unit 300 determines that the tool TL needs to be replaced (step S102; YES), it moves the tool spindle 20 to the replacement position Ps (step S103).

Then, the control unit 300 removes the tool TL1 from the tool spindle 20 and attaches a tool TL2, which is different from the tool TL1, to the tool spindle 20 (step S104). In step S104, as shown in FIG. 1, first, the arm portion 32 grips the tool TL1 mounted on the tool spindle 20, and the arm portion 33 grips the tool TL1 transported by the tool transport device 40. In this state, the arm portion 32 is retracted from the tool spindle 20 by a shaft drive mechanism (not shown) that moves the rotating shaft portion 31 in the Y-axis direction. Thereby, the tool TL1 is removed from the tool spindle 20. Next, after rotating 180° around the rotating shaft portion 31, the arm portion 33 approaches the tool spindle 20 by the shaft driving mechanism. As a result, the tool TL2 held by the arm portion 33 is attached to the tool spindle 20.
The tool spindle 20 processes the workpiece W using the installed tool TL2 at the same time as after step S105, which will be described later.

Then, the control unit 300 receives the tool TL1 from the tool changing device 30 via the tool transport device 40 (step S105). In step S105, in detail, as shown in FIG. let Then, as shown in FIG. 2, the control section 300 moves the tool holding section 43 to the lower position YL via the Y-axis moving mechanism 41Y. Thereby, the tool holding section 43 approaches the tool TL1 held by the arm section 32 and receives the tool TL1.

Next, the control unit 300 sets the stop position YS according to the length of the tool TL1 (step S106). Specifically, the control unit 300 sets the stop position YS so that the tip of the blade portion TLa of the tool TL1 is at the same height as the detection needle 62, regardless of the length of the blade portion TLa. The shorter the length of the blade part TLa, the closer the stop position YS is to the bed S in the Y-axis direction, and the longer the length of the blade part TLa, the farther the stop position YS is set to the bed S in the Y-axis direction. For example, a plurality of stopping positions depending on the type of tool are stored in advance in the memory as a data table. Then, the control unit 300 may set a stopping position according to the type of tool based on this data table. The stop position YS is variable depending on the length of the blade part TLa of the tool TL1, but the stop position ZS is constant regardless of the length of the blade part TLa of the tool TL1.
Note that the timing for setting the stop position YS is not limited to this example, and may be any timing as long as it is before step S107.

Next, the control unit 300 moves the tool TL1 held by the tool holding unit 43 to the stop positions YS, ZS, and stops the tool TL1 at the stop positions YS, ZS (step S107). In this step S107, in detail, as shown in FIG. 2, the control unit 300 moves the tool TL1 held in the tool holding unit 43 from the lower position YL to the stop position YS via the Y-axis moving mechanism 41Y. , the tool TL1 is stopped at the stop position YS. After this or at the same time, the control section 300 moves the tool TL1 held in the tool holding section 43 via the Z-axis moving mechanism 41Z to the stop position ZS, as shown in FIGS. Stop TL1 at stop position ZS. Thereby, the tip side of the blade portion TLa of the tool TL1 is in a position where it can come into contact with the rotating detection needle 62.

Then, the control unit 300 detects whether or not the tool TL1 is broken through the tool breakage detection device 60 (step S108). In this step S108, in detail, as shown in FIG. 4, the control unit 300 moves the detection needle 62 counterclockwise from the original position shown by the solid line along the Z-axis direction when viewed from above via the needle drive unit 63b. Rotate by a predetermined angle α. The predetermined angle α is set to an angle at which the rotation locus of the detection needle 62 includes the blade portion TLa of the tool TL1. The predetermined angle α is set to, for example, 135°. The detection unit 63a detects that the tool TL1 is not broken when the rotation of the detection needle 62 is restricted by contacting the blade portion TLa of the tool TL1, and the rotation of the detection needle 62 is restricted by contacting the blade portion TLa of the tool TL1. In other words, when the detection needle 62 misses its swing, it is detected that the tool TL1 is broken. The control unit 300 may notify the operator of the presence or absence of breakage of the tool TL1 detected by the tool breakage detection device 60 through a display or a sounding unit (not shown).

Next, the control unit 300 moves the tool holding unit 43 to the upper position YH or the lower position YL via the Y-axis moving mechanism 41Y (step S109). In step S109, in detail, when storing the tool TL1 in the magazine 51 of the tool magazine device 50, the control section 300 moves the tool holding section 43 to the upper position YH, and stores the tool TL1 in the magazine 51 of the tool magazine device 50. 52, the tool holder 43 is moved to the lower position YL.

Next, the control unit 300 stores the tool TL1 held by the tool holding unit 43 in the tool magazine device 50 via the Z-axis moving mechanism 41Z (step S110). In step S110, in detail, the control unit 300 drives the magazine drive motor 53 so that the gripping parts 51a and 52a of the magazines 51 and 52 that are not gripping the tool TL are the tools held by the tool holding part 43. The magazines 51 and 52 are rotated around the magazine rotation shaft 50J so as to face TL1. Then, the control unit 300 moves the tool holding unit 43 closer to the magazines 51 and 52 via the Y-axis moving mechanism 41Y and the Z-axis moving mechanism 41Z, and moves the tool TL1 held by the tool holding unit 43 to the gripping unit. 51a and 52a.

Finally, the control unit 300 receives a new tool from the tool magazine device 50 via the tool transport device 40, delivers the new tool to the tool exchange device 30 (step S111), and ends the tool exchange process. In step S111, in detail, the control unit 300 drives the magazine drive motor 53 so that the gripping parts 51a and 52a of the magazines 51 and 52 that grip a new tool face the tool holding part 43. The magazines 51 and 52 are rotated around the rotating shaft 50J. Then, the control section 300 moves the tool holding section 43 closer to the magazines 51 and 52 via the Y-axis moving mechanism 41Y and the Z-axis moving mechanism 41Z, so that the tool holding section 43 transfers the new tool to the gripping sections 51a and 52. Receive from 52a. Then, after moving the tool holding section 43 to a position facing the arm section 32 of the tool changing device 30, the control section 300 transfers a new tool held by the tool holding section 43 to the arm section 32 of the tool changing device 30. Hand over. In this state, the tool changing device 30 waits until the timing for exchanging the tool TL of the tool spindle 20.

(effect)
According to the embodiment described above, the following effects are achieved.
(1) The tool breakage detection device 60 detects whether or not the tool TL, which is removed from the tool spindle 20, which is an example of a tool unit for machining the workpiece W, and is transferred through the tool exchange transfer section 3, is broken or not outside the tooling zone TZ. A detection unit 63a for detection is provided.
According to this configuration, the presence or absence of breakage of the tool TL is detected by the detection unit 63a outside the tooling zone TZ. Therefore, chips, coolant, vibrations, etc. generated during machining of the workpiece W are suppressed from affecting detection by the detection unit 63a. Therefore, the presence or absence of tool breakage can be detected more accurately through the tool breakage detection device 60.
Furthermore, even during processing of the workpiece W by the tool spindle 20, it is possible to detect whether or not the tool TL is broken through the tool breakage detection device 60. Therefore, the machining time for detecting whether or not the tool TL is broken is suppressed from increasing.

(2) The detection unit 63a detects the presence or absence of breakage of the tool TL when the tool TL is stopped moving at the stop positions YS, ZS while the tool TL is being transported by the tool transport device 40 of the tool exchange transport unit 3. do.
According to this configuration, the presence or absence of breakage of the tool TL in a state where the movement is stopped is detected. Therefore, the presence or absence of tool breakage can be detected more accurately through the tool breakage detection device 60.

(3) The tool breakage detection device 60 includes a needle support section 61, a detection needle 62 that is rotatably supported by the needle support section 61, and a needle drive section 63b that rotates the detection needle 62. The detection unit 63a detects that the tool TL is not broken when the rotation of the detection needle 62 by the needle drive unit 63b is restricted by the tool TL while the movement of the tool TL is stopped at the stop positions YS, ZS. When the rotation of the detection needle 62 is not restricted by the tool TL, it is detected that the tool TL is broken.
According to this configuration, even if the detection needle 62 rotates to detect the presence or absence of breakage of the tool TL, the operation of the tool spindle 20 is not obstructed, and the presence or absence of breakage of the tool TL is detected more easily and accurately. can do.

(4) The tool breakage detection system 5 includes a tool breakage detection device 60 and a tool exchange conveyance section 3. The tool exchange transfer section 3 is configured to operate between a tool exchange device 30 that exchanges a tool TL mounted on the tool spindle 20, a tool magazine device 50 that accommodates a plurality of tools TL, and between the tool exchange device 30 and the tool magazine device 50. A tool transport device 40 that transports the tool TL is provided. The detection needle 62 is provided so as to be rotatable along the X-axis direction and the Z-axis direction intersecting the blade portion TLa of the tool TL at the stop positions YS and ZS. The tool transport device 40 transports the tool TL in the Y-axis direction along the blade portion TLa. The tool breakage detection system 5 sets the stop position YS so that the blade part TLa of the tool TL is at a position corresponding to the detection needle 62 according to the length along the blade part TLa of the tool TL, and A control unit 300 is provided to stop the tool TL at a set stop position YS.
In the comparative example in which the stop position YS is constant regardless of the length of the tool TL, for example, when the length of the tool TL is short, the detection needle 62 is not connected to the tool TL even though there is no breakage of the tool TL. There is a risk that the tool TL will not come into contact with the blade part TLa, resulting in a missed swing, and the tool breakage detection device 60 may mistakenly detect that the tool TL is broken. In addition, in this comparative example, when the length of the tool TL is long, the detection needle 62 comes into contact with the unbroken part of the blade part TLa even though the tip of the blade part TLa of the tool TL is broken. However, there is a risk that the tool breakage detection device 60 may mistakenly detect that the tool TL is not broken.
According to the above configuration, the stop position YS of the tool TL is set according to the length of the tool TL. Therefore, false detections like those in the above comparative example can be suppressed. Further, there is no need for the operator to adjust the position of the tool breakage detection device 60.

(5) The machine tool 1 includes a tool breakage detection system 5, a spindle unit 10 that grips the workpiece W, and a tool spindle 20.
According to this configuration, in the machine tool 1, even when the tool spindle 20 is machining the workpiece W gripped by the spindle unit 10, the tool TL removed from the tool spindle 20 through the tool breakage detection device 60 It is possible to accurately detect the presence or absence of breakage.

Note that the present invention is not limited to the above embodiments and drawings. It is possible to make changes (including deletion of constituent elements) as appropriate without changing the gist of the present invention. An example of the modification will be described below.

In the above embodiment, the machine tool 1 includes one spindle unit 10, but the present invention is not limited to this, and the machine tool 1 may include two spindle units 10 facing each other.

In the above embodiment, the control unit 300 sets the stop position YS according to the length of the tool TL, but the present invention is not limited to this, and the control unit 300 sets the stop position YS constant regardless of the length of the tool TL. You may.

In the embodiment described above, the tool breakage detection device 60 is a pointer type in which the detection needle 62 is rotated, but the device is not limited to this, and other types may be adopted as long as breakage of the tool TL can be detected. .
For example, the tool breakage detection device 60 may be a push switch type detection device that is pressed by the tip of the tool TL, or a non-contact detection device that uses light or electromagnetic waves to detect whether or not the tool TL is broken in a non-contact manner. It's okay.

In the embodiment described above, the tool exchange device 30 and the tool conveyance device 40 in the tool exchange conveyance unit 3 are configured as separate devices, but they may be configured as the same device. In this case, the tool transport device 40 may have the function of the tool transport device 40 by directly transferring the tool TL to the tool spindle 20 from the tool holder 43. Furthermore, in this case, the tool holding section 43 is configured to be able to hold a plurality of tools TL, and may receive the first tool from the tool spindle 20 and deliver the second tool to the tool spindle 20.

In the embodiment described above, the tool breakage detection device 60 is fixed to the support post 54, but the tool breakage detection device 60 is not limited to this if it is outside the tooling zone TZ. It may be fixed to the device 30. When the tool breakage detection device 60 is fixed to the tool holder 43, for example, the tool breakage detection device 60 may move the tool holder 43 without stopping the tool holder 43 at the stop positions YS, ZS. Detection may also be performed.
Further, the tool breakage detection device 60 detects whether or not the tool TL held by the gripping portions 51a and 52a of the magazines 51 and 52 or the tool TL held by the arm portions 32 and 33 of the tool changer 30 is broken. Good too.
Moreover, the number of magazines 51 and 52 may be singular or three or more.

DESCRIPTION OF SYMBOLS 1... Machine tool, 3... Tool exchange conveyance part, 5... Tool breakage detection system, 10... Spindle unit, 11... Spindle, 15... Head stock, 20... Tool spindle, 30... Tool exchange device, 31... Rotating shaft part, 31J... Rotating shaft, 32, 33... Arm portion, 40... Tool transport device, 41Y... Y-axis moving mechanism, 41Z... Z-axis moving mechanism, 41a, 41d... Motor, 41b, 41e... Ball screw, 41c, 41f... Nut , 43... Tool holding part, 50... Tool magazine device, 50J... Magazine rotating shaft, 51, 52... Magazine, 51a, 52a... Gripping part, 53... Magazine drive motor, 54... Support column, 55... Magazine support shaft, 56... Support frame, 60... Tool breakage detection device, 61... Needle support section, 62... Detection needle, 63a... Detection section, 63b... Needle drive section, 64... Fixing bracket, 300... Control section, α... Angle, B... Rotation axis , S...Bed, R1...Moving route, W...Work, TL, TL1, TL2...Tool, TZ...Touring zone, YH...Upper position, YL...Lower position, ZL...Arm opposing position, YS, ZS...Stop position , ZR...Magazine gripping section opposing position, Ps...exchange position, TLa...blade section

Claims (2)

A tool breakage detection device,
A tool breakage detection system comprising: a tool exchange conveyance unit that conveys a tool in a direction along a blade portion of the tool and stops movement of the tool at a stop position during conveyance of the tool,
The tool breakage detection device includes a detection unit that detects, outside a tooling zone, whether or not the tool that is removed from a tool unit that processes a workpiece and is conveyed through the tool exchange conveyance unit is broken; a needle support unit; It has a detection needle supported by a needle support part, and a needle drive part that rotates the detection needle,
The tool breakage detection system sets the stop position so that the blade part of the tool is at a position corresponding to the detection needle according to the length along the blade part of the tool, and the tool change conveyance unit a control unit for stopping the tool at the set stop position through the control unit ;
The detection needle of the tool breakage detection device is provided so as to be pivotable along a direction intersecting the blade portion of the tool at the stop position,
The detection unit of the tool breakage detection device detects that the tool is not broken when the rotation of the detection needle by the needle drive unit is limited by the tool conveyed by the tool exchange conveyance unit; detecting that the tool is broken when the rotation of the detection needle is not restricted by the tool conveyed by the tool exchange conveyance section ;
Tool breakage detection system. The tool breakage detection system according to claim 1 ;
a spindle unit that grips the work;
the tool unit that processes the workpiece gripped by the spindle unit;
Machine Tools.