JP7806087B2 - Workpiece processing equipment - Google Patents

Description

This specification relates to a workpiece processing device.

Patent Document 1 discloses one type of workpiece processing device, a laser processing device equipped with skip means that, when a processing abnormality is detected during processing, suspends processing and skips the remaining processing to proceed to the next processing; storage means that, when a skip is performed by the skip means, stores the processing start position of the skipped processing and a processing program pointer; and re-processing means that, upon a processing resume command, positions the device at the stored processing start position and performs the skipped processing based on the processing program and the stored pointer. With this laser processing device, program processing of the processing program allows the device to position the device at the processing start position of the processing skipped due to a cutting defect and resume processing, further improving work efficiency.

Japanese Patent Application Laid-Open No. 2004-306073

In the laser processing device described in Patent Document 1 mentioned above, when a processing abnormality is detected, the temporarily stopped processing can be restarted from the processing start position of the skipped processing, but there is a demand for restarting processing from a more appropriate position.

In light of these circumstances, this specification discloses a workpiece processing device that can resume processing from a more appropriate position when a processing abnormality is detected.

This specification discloses a workpiece processing device comprising: a processing unit that processes a workpiece using a processing tool in accordance with a processing program that is divided into a plurality of processing groups; an abnormality detection unit that detects an abnormality during the processing by the processing unit; a processing stop unit that stops the processing when the abnormality is detected by the abnormality detection unit; a processing restart unit that restarts the processing from the beginning of the processing group when the processing is stopped by the processing stop unit; and a display unit that displays a restart group selection screen on a display device to allow an operator to select a restart group, which is the processing group from which the processing will be restarted, wherein the display unit displays the processing program, a plurality of processing groups corresponding to the processing program, and the location where the abnormality occurred on the restart group selection screen .

According to the present disclosure, in a workpiece machining device, when machining is stopped by the machining stop unit due to an abnormality detected by the abnormality detection unit, the machining restart unit resumes machining from the beginning of a machining group into which machining programs are grouped. This allows the workpiece machining device to resume machining from an appropriate position according to the grouping of the machining groups, and as a result, when a machining abnormality is detected, it becomes possible to resume machining from a more appropriate position.

1 is a perspective view showing the inside of a multi-tasking machine 1 to which a workpiece machining device is applied. 2 is a side view showing the inside of the multi-tasking machine 1 shown in FIG. 1. FIG. 2 is a side view showing the tool spindle unit 2 shown in FIG. 1 . 2 is a front view of the appearance of the multi-tasking machine 1 shown in FIG. 1. FIG. 5 is a front view of the operation panel 110 shown in FIG. 4 . 1 is a block diagram showing a multi-tasking machine 1. FIG. 7 is a flowchart showing a program executed by the control device 90 shown in FIG. 6. FIG. 7 is a diagram showing an example of a program executed by the control device 90 shown in FIG. 6 . FIG. 9 shows a restart group selection screen 90b1.

An embodiment of a multi-tasking machine to which a workpiece machining device is applied will be described below. The multi-tasking machine 1 of this embodiment is a machine tool that combines the functions of both an NC lathe and a machining center. As shown in Figure 1, this multi-tasking machine 1 includes opposed twin-spindle lathes, each of which is symmetrically arranged on the left and right sides, including a first workpiece spindle unit 3 and a second workpiece spindle unit 4 that impart rotation to the gripped workpiece W, and a first turret unit 5 and a second turret unit 6 that have multiple tools T (turret tools) corresponding to the machining of the workpiece W. In addition, a tool spindle unit 2 is provided in the center of the machine body to perform machining that is difficult to perform on a lathe.

(multi-tasking machine)
The multi-tasking machine 1 is a workpiece machining device that machines a workpiece W, and has a first workpiece spindle device 3, a second workpiece spindle device 4, a first turret device 5, a second turret device 6, and a tool spindle device 2 mounted on a single bed 7. In particular, the multi-tasking machine 1 has a compact configuration that enables space saving. Specifically, the first workpiece spindle device 3 and the second workpiece spindle device 4 are disposed at the front of the machine body, and the first turret device 5 and the second turret device 6 are disposed behind them (see FIG. 2 ). In addition to the opposed twin-spindle lathe, the multi-tasking machine 1 also has the tool spindle device 2 disposed in the center of the machine body, sandwiched between the first turret device 5 and the second turret device 6.

(opposing two-spindle lathe)
The first workpiece spindle unit 3 and the second workpiece spindle unit 4 are designed so that the center lines of their spindles are horizontal and aligned with the machine body width direction, and their movement direction is the Z-axis direction parallel to the spindles. The first and second turret units 5, 6 and the tool spindle unit 2 all move along the machine body's front-to-rear and up-to-down directions, which are perpendicular to the spindle (Z-axis). In particular, while the tool spindle unit 2 moves along the horizontal Y-axis and the vertical X-axis, the first and second turret units 5, 6 move along the YL-axis (see FIG. 2 ) and XL-axis, which are inclined 45 degrees from the Y-axis and X-axis.

In order to minimize the longitudinal dimensions of the multitasking machine 1, the bed 7 has a slant bed structure, with the first and second work spindle units 3, 4 mounted on a front inclined surface 11 that is lower at the front, and the first and second turret units 5, 6, located at the rear of the machine, mounted on a rear inclined surface 12 that is lower at the rear (see Figure 2). The front inclined surface 11 is positioned low, and the rear inclined surface 12 is positioned high, so that the entire machine is tilted forward.

The first and second work spindle devices 3, 4 (hereinafter, referred to as work spindle devices 3, 4 when describing both devices together) have the same structure, and as shown in Figures 1 and 2, a spindle is rotatably mounted on a cylindrical headstock 22, to which is attached a chuck mechanism 21 that grips and releases the workpiece W to be machined. A belt is passed between the spindle and the rotating shaft of the spindle motor 23 via a pulley, so that the workpiece W gripped by the chuck mechanism 21 can be phased during machining and rotated at a predetermined speed. The current (drive current) of the spindle motor 23 is detected by a current sensor 23a (see Figure 6), and the detection result is output to the control device 90, described below.

The workpiece spindle devices 3, 4 are provided with a drive mechanism in which the headstock 22 and spindle motor 23 are mounted on the spindle slide 24 and move along the Z-axis direction on the front inclined surface 11 of the bed 7. Two guide rails 25 parallel to the Z-axis are fixed to the front inclined surface 11, and a guide block 26 fixed to the underside of the spindle slide 24 slidably engages with them. The underside of the spindle slide 24 is aligned with the angle of the front inclined surface 11, and the headstock 22 and spindle motor 23 are mounted vertically so that they do not protrude significantly forward from the front inclined surface 11.

As shown in Figure 1, the work spindle devices 3, 4 are capable of moving along the Z-axis direction via a ball screw mechanism, and a screw shaft 27 parallel to the Z-axis is supported via bearings between two guide rails 25. A Z-axis servo motor 28 is provided on the outside of the machine body in the width direction, and its rotation shaft is connected to the screw shaft 27. Meanwhile, a nut member through which the screw shaft 27 passes is fixed to the spindle slide 24, and the rotation output of the Z-axis servo motor 28 causes linear movement of the spindle slide 24 along the Z-axis direction. The current (drive current) of the Z-axis servo motor 28 is detected by a current sensor 28a (see Figure 6), and the detection result is output to the control device 90, described below.

Next, the first turret unit 5 and the second turret unit 6 (hereinafter, referred to as turret units 5 and 6 when describing both units collectively) select a corresponding tool T from among multiple tools T by swivel indexing and perform a predetermined process, such as cutting, on the workpiece W. In this embodiment, the tool T is a cutting tool such as a cutting tool or drill, which is a type of machining tool used to machine the workpiece W. As shown in FIGS. 1 and 2, the turret units 5 and 6 are configured such that multiple tools T are mounted at equal intervals along the circumferential direction on a disk-shaped turret 31, and an indexing servo motor 32 controls the rotation to position any tool T at a machining position on the circumference. The tool T on the turret 31 is mounted with the tip of the cutting tool or drill facing outward in the width direction of the machine body (toward the paired workpiece spindle unit). Therefore, during machining, the workpiece spindle units 3 and 4 move along the Z-axis, causing the tool T to come into contact with the workpiece W moving along the Z-axis from the center of the machine body.

As shown in Figure 2, the turret devices 5 and 6 are equipped with a drive mechanism that moves the turret 31 along the YL-axis and XL-axis directions, which are angled 45 degrees relative to the horizontal and vertical directions, on an XY plane perpendicular to the Z-axis to move the tool T to the machining position. The bed 7 has a rear inclined surface 12 parallel to the YL-axis, to which a YL-axis guide rail 33 is fixed. A base slide 34, which has a generally triangular cross section, has a guide portion 35 on one surface that slides along the YL-axis guide rail 33. The adjacent surface, at 90 degrees, is the mounting surface for the turret 31, and is equipped with an XL-axis guide rail 36. The guide portion 40 of the turret slide 37 slidably engages with the XL-axis guide rail 36.

The base slide 34 and turret slide 37 are equipped with ball screw mechanisms. Screw shafts parallel to the YL-axis guide rail 33 and the XL-axis guide rail 36 are supported by bearings, and these screw shafts pass through nuts fixed to the base slide 34 and turret slide 37. Each screw shaft is connected to the rotation shaft of the YL-axis servo motor 38 or the XL-axis servo motor 39. Therefore, by controlling the drive of the YL-axis servo motor 38 and the XL-axis servo motor 39, the turret devices 5 and 6 can control the movement of the turret 31 along the YL-axis and XL-axis, respectively, as well as along the horizontal direction, which is a combination of the movement along both axes. The current (drive current) of the YL-axis servo motor 38 is detected by a current sensor 38a (see Figure 6), and the detection result is output to the control device 90, which will be described later. The current (drive current) of the XL-axis servo motor 39 is detected by a current sensor 39a (see Figure 6), and the detection result is output to the control device 90.

(Tool spindle device)
The tool spindle unit 2 enables workpiece machining at depths and angles that cannot be achieved with the turret units 5 and 6. The tool spindle unit 2 has a spindle servo motor 41a (see FIG. 6) and a tool spindle built into the spindle head 41, and various tools T (spindle head tools) housed in an automatic tool changer 8 (see FIG. 4) are replaced with a tool mounting section at the bottom end of the spindle head 41. As shown in FIG. 3, the spindle head 41 is rotatably attached to the spindle slide 42, and the rotation of the B-axis motor 43 is transmitted to the spindle head 41a via a rotation transmission mechanism. The current (drive current) of the spindle servo motor 41a is detected by a current sensor 41a1 (see FIG. 6), and the detection result is output to the control device 90. The current (drive current) of the B-axis motor 43 is detected by a current sensor 43a (see FIG. 6), and the detection result is output to the control device 90.

The tool spindle unit 2 is equipped with a drive mechanism that moves the spindle head 41 along the horizontal Y-axis direction and the vertical X-axis direction to move the tool T to the machining position. A horizontal guide rail 44 is fixed to the bed 7, and a guide portion 46 of the base slide 45 slidably engages with it. A vertical guide portion 46 (extending along the X-axis direction) is configured on the front side of the base slide 45, and a guide portion 47 of the spindle slide 42 slidably engages with it. Both the base slide 45 and the spindle slide 42 are equipped with ball screw mechanisms. The screw shafts for each direction pass through nut members fixed to the base slide 45 or the spindle slide 42, and are connected to a Y-axis servo motor 48 or an X-axis servo motor 49. The current (drive current) of the Y-axis servo motor 48 is detected by a current sensor 48a (see Figure 6), and the detection result is output to the control device 90. The current (drive current) of the X-axis servo motor 49 is detected by a current sensor 49 a (see FIG. 6 ), and the detection result is output to the control device 90 .

The multitasking machine 1 not only simultaneously processes a workpiece W using the first workpiece spindle unit 3 and the second workpiece spindle unit 4, but is also capable of tool changes in the tool spindle unit 2. Therefore, as shown in FIG. 1, two separation shutters 15 are provided to protect each unit from the effects of coolant, chips, etc. The separation shutters 15 are located on both sides of the tool spindle unit 2 in the width direction and are configured to move horizontally along the fore-and-aft direction of the machine body using a drive mechanism. The separation shutters 15 allow the multitasking machine 1 to be divided into a first machining chamber 10A consisting of the first workpiece spindle unit 3 and turret unit 5, a second machining chamber 10B consisting of the second workpiece spindle unit 4 and second turret unit 6, and a tool change chamber 10C for the tool spindle unit 2. By closing only one of the separation shutters 15, the space including the tool change chamber 10C can be used as the first machining chamber 10A or the second machining chamber 10B.

As shown in FIG. 4, the multitasking machine 1 further includes a first workpiece spindle unit 3 mounted on the bed 7, a machine body cover 100, an automatic tool changer 8, an automatic workpiece transport device 9, and a control device 90. The tool spindle unit 2, workpiece spindle units 3 and 4, turret units 5 and 6, the automatic tool changer 8, the automatic workpiece transport device 9, and the control device 90 are all covered by the machine body cover 100. The gantry-type automatic workpiece transport device 9 protrudes upward from the machine body cover 100 and is configured to move the gripped workpiece W along three axial directions inside the machine body. A control panel 110 is located in the center of the front of the machine body, and a left front door 151 and a right front door 152 are formed on both the left and right sides of the control panel 110. The tool spindle unit 2 is located behind the control panel 110, and the first and second machining chambers 10A and 10B are located behind the left front door 151 and the right front door 152. The automatic tool changer 8 is arranged so that its tool magazine protrudes forward beyond the left and right front doors 151 and 152 on the front of the machine body, and is covered by a magazine cover 153.

As shown in Figure 5, the operation panel 110 is equipped with an input device 90a and a display device 90b. The input device 90a has an operation switch section 90a1, a keyboard section 90a2, etc. The operation switch section 90a1 has an operation preparation switch 90a11, an automatic/individual mode selector switch 90a12, an automatic start switch 90a13, an emergency stop switch 90a14, an abnormality reset switch 90a15, and a continuous off switch 90a16. The abnormality reset switch 90a15 is a switch that is turned on to reset an abnormal condition when an abnormality has occurred in the multi-tasking machine 1 and automatic operation has been stopped. The display device 90b displays the restart group selection screen (see Figure 9), which will be described later.

(Control device)
The control device 90 is a control device that drives and controls the tool spindle device 2, workpiece spindle devices 3 and 4, turret devices 5 and 6, automatic tool changer 8, and automatic workpiece transport device 9. In particular, the control device 90 stops workpiece machining if an abnormality occurs during workpiece machining, and when restarting workpiece machining, restarts it from the beginning of the machining group into which the machining programs are grouped. As shown in FIG. 6 , the control device 90 is connected to an input device 90a, a display device 90b, a storage device 90c, each of the current sensors 23a, 28a, 38a, 39a, 41a1, 43a, 48a, and 49a, each of the motors 23, 28, 32, 38, 39, 41a, 43, 48, and 49, the automatic tool changer 8, and the automatic workpiece transport device 9.

The input device 90a is provided on the front of the multi-tasking machine 1 and allows the operator (user) to input various settings, instructions, etc. into the control device 90. The display device 90b is provided on the front of the multi-tasking machine 1 and displays information such as the operating status and maintenance status to the operator. The memory device 90c stores data related to the control of the multi-tasking machine 1, such as the control program (machining program), parameters used in the control program, data related to various settings and instructions, actual detection data, association data, etc. (storage unit).

The control device 90 has a microcomputer (not shown), which includes an input/output interface, a CPU, RAM, and ROM (all not shown), all connected via a bus. The CPU executes various programs to acquire data, detection signals, control information, etc. from the input device 90a, memory device 90c, and current sensors 23a, 28a, 38a, 39a, 41a1, 43a, 48a, and 49a, and controls the display device 90b, motors 23, 28, 32, 38, 39, 41a, 43, 48, and 49, automatic tool changer 8, and automatic workpiece transport device 9. The RAM temporarily stores variables necessary for executing the programs, and the ROM stores the programs.

(Workpiece processing)
Furthermore, workpiece machining in the above-mentioned workpiece machining device (multi-tasking machine 1) will be described with reference to the flowchart shown in FIG. 7. When an instruction to start automatic operation is received, the control device 90 starts automatic operation related to workpiece machining (machining unit). In automatic operation, machining of the workpiece W using machining tools is carried out in accordance with a machining program. As shown in FIG. 8, the machining programs are divided into a plurality of machining groups. The machining groups are grouped according to the content of machining. Examples of the content of machining include the type of machining tool and the machining part to be machined. Examples of the machining part include end face machining, internal diameter machining, and external diameter machining.

Machining groups will be explained with reference to Figure 8. The machining program in question is named O01 (program name). Machining program O01 has machining groups A to E, which are grouped according to the type of machining tool. Machining group A has three blocks with sequence numbers 1 to 3. Machining group B is a group that uses tool T with tool number T200 for machining, and has 14 blocks with sequence numbers 4 to 17. Machining group C is a group that uses tool T with tool number T300 for machining, and has 16 blocks with sequence numbers 18 to 33. Machining group D is a group that uses tool T with tool number T400 for machining, and has 15 blocks with sequence numbers 34 to 48. Machining group E has six blocks with sequence numbers 49 to 54. Each block has standard G code and M code.

The beginning of machining group A is the block with sequence number 1, the beginning of machining group B is the block with sequence number 4, the beginning of machining group C is the block with sequence number 18, the beginning of machining group D is the block with sequence number 34, and the beginning of machining group E is the block with sequence number 49. At the beginning of machining groups B to D, there are blocks containing the words "N2T200***," "N3T300***," and "N4T400***," respectively. "N**" is a word indicating the beginning of a machining group. By detecting (storing) "N**," the control device 90 can detect the beginning of each machining group and can further group machining programs into machining groups based on the detected beginning of the machining group.

When an instruction to start automatic operation is received, the control device 90 starts automatic operation related to workpiece machining. Specifically, in step S102, the control device 90 determines whether automatic operation has started based on the on/off status of the automatic start switch 90a13. If the automatic start switch 90a13 is on, the control device 90 determines that automatic operation has started ("YES" in step S102) and proceeds to step S104. On the other hand, if the automatic start switch 90a13 is off, the control device 90 determines that automatic operation has not started ("NO" in step S102) and repeats the processing of step S102.

In step S104, the control device 90 performs automatic operation (machining section) to machine the workpiece W (workpiece machining). For example, in the multi-tasking machine 1, the workpiece W is machined according to the following procedure: The workpiece W in the input stocker is transported by the automatic workpiece transport device 9 to the first workpiece spindle device 3 and gripped by the chuck mechanism 21. In the first turret device 5, the tool T selected by driving the turret 31 moves along a machining movement line L1 parallel to the YL axis and is positioned at the machining position relative to the workpiece W. In the first workpiece spindle device 3, the workpiece W gripped by the chuck mechanism 21 is rotated by driving the spindle motor 23, and the spindle slide 24 moves in the Z-axis direction along the guide rail 25, thereby bringing the tool T into contact with the workpiece W and performing the specified machining.

The first machining of the workpiece W in the first workpiece spindle device 3 is performed by the first turret device 5, as well as by the tool spindle device 2, or by the tool spindle device 2 alone. When the workpiece W is machined by the tool spindle device 2, the turret 31 moves away from the first workpiece spindle device 3. The tool spindle device 2 is positioned by movement along the Y-axis and X-axis directions, and the angle of the tool T is adjusted by rotation of the spindle head 41 about the B-axis.

Next, to transfer the workpiece W from the first workpiece spindle device 3 to the second workpiece spindle device 4, both devices approach the center of the machine, and the second workpiece spindle device 4 goes to retrieve the workpiece W from the first workpiece spindle device 3, which has stopped earlier, and the workpiece W is re-gripped by the chuck mechanisms 21. In the second workpiece spindle device 4, the second machining is performed on the workpiece W by the second turret device 6, similar to the first machining, or machining is performed by the tool spindle device 2 in addition, or machining is performed by the tool spindle device 2 alone. Then, after the second machining is completed, the workpiece W is removed by the automatic workpiece transport device 9 and collected in the output stocker.

The control device 90 stops automatic operation if an abnormality occurs during automatic operation (workpiece machining). Specifically, in step S106, the control device 90 detects an abnormality (abnormality detection unit) during workpiece machining in step 104 (during automatic operation (workpiece machining)). For example, the control device 90 detects an abnormality in the machining load, which is a detectable physical quantity related to the machining of the workpiece W. Specifically, the machining load is the load generated when cutting (machining) the workpiece W with a cutting tool, and is a physical quantity that acts as resistance to machining (machining resistance). Here, the machining load refers to the magnitude of the force and energy consumed by the workpiece W or cutting tool (the driven side) that generates machining resistance on the driving side (in this embodiment, the above-mentioned servo motors), for example, the torque load on the drive shaft.

In step S106, the control device 90 obtains, for example, from the current sensor 23a that detects the drive current of the spindle motor 23 for driving the spindle of the work spindle, and can derive the machining load of the spindle motor 23 (torque load applied to the work spindle (work spindle machining load)) from the detected current (derivation unit). For example, the machining load is derived as the machining load corresponding to the detected current by using a map or equation that shows the correlation between the drive current and the machining load. Similar to the work spindle machining load, the machining load of the motors that drive other drive axes (Z-axis machining load, tool spindle machining load, etc.) can also be derived.

Furthermore, in step S106, the control device 90 compares the detected actual detection data (machining load) with the monitoring range (teaching data) stored in the memory device 90c and determines whether the actual detection data is outside the monitoring range, thereby determining whether there is an abnormality in the machining load related to the machining of the workpiece W (abnormal load on the workpiece W). The monitoring range is the range for monitoring (determining) the state of the machining load (detectable physical quantity). If the actual detection data is within the monitoring range, the control device 90 determines that there is no abnormality in the machining load ("NO" in step S106). On the other hand, if the actual detection data is outside the monitoring range, the control device 90 determines that there is an abnormality in the machining load (that an immediate stop abnormality has occurred) ("NO" in step S106), and proceeds to step S108.

In step S108, the control device 90 stops automatic operation. In this way, when an abnormality is detected in step S106 (abnormality detection unit), the control device 90 stops workpiece processing (processing stop unit). Furthermore, it is preferable that the control device 90 stores the program (block) in which the abnormality occurred in the memory device 90c. In this embodiment, it is assumed that an immediate stop abnormality occurred at sequence number 22, and this fact is stored in the memory device 90c.

Furthermore, when the automatic operation of the multi-tasking machine 1 is stopped, the control device 90 notifies the operator of this fact. This notification enables the operator to investigate the cause of the abnormality in the multi-tasking machine 1, identify the cause of the abnormality, and resolve the abnormal condition. Once the abnormal condition is resolved, the operator turns on the abnormality reset switch 90a15, returning the multi-tasking machine 1 to a state in which normal automatic operation can be performed.

When the abnormal condition is resolved, the control device 90 resumes automatic operation (processing resumption section). Specifically, when the control device 90 detects that the abnormal condition has been resolved ("YES" in step S110), the control device 90 proceeds to step S112 and beyond, automatically resuming automatic operation. On the other hand, if the abnormal condition is not resolved and the abnormal condition reset switch 90a15 is not turned on, the control device 90 repeatedly returns "NO" in step S110. In step S110, the control device 90 detects that the abnormal condition has been resolved.

The control device 90 preferably allows the operator to specify (select) the machining group to be resumed (designation unit). First, in step S112, the control device 90 displays the machining location to be resumed on the display device 90b. Specifically, the control device 90 displays the restart group selection screen 90b1 shown in FIG. 9 on the display device 90b. The restart group selection screen 90b1 has a first selection button 90b1a, a second selection button 90b1b, and a third selection button 90b1c. The first selection button 90b1a is a button for resuming automatic operation from the machining group immediately before the machining group (stopped machining group) containing the program (block) where automatic operation was stopped. The second selection button 90b1b is a button for resuming automatic operation from the stopped machining group. The third selection button 90b1c is a button for resuming automatic operation from the machining group immediately after the stopped machining group.

In this embodiment, as shown in Figure 8, the processing stopped group is processing group C, which includes sequence number 22 where the abnormality occurred, the previous processing group is processing group B, and the next processing group is processing group D. It is preferable that the second selection button 90b1b, "From the stopped group," be selected from the beginning (set as the default) on the restart group selection screen 90b1. This is to prevent forgetting to select the restart group.

The control device 90 may also display on the restart group selection screen the machining program, the machining group corresponding to the machining program, and the location where the abnormality occurred, as shown in Figure 8. This allows the operator to select the restart group while actually referring to the block and machining program where the abnormality occurred, making it possible to restart from a more appropriate location.

When the control device 90 has completed the selection of the machining location (restart group) to be resumed (determined as "YES" in step S114), the program proceeds to step S116 and resumes automatic operation from the selected location. Meanwhile, the control device 90 repeatedly performs the processing of step S114 until the selection of the machining location (restart group) to be resumed is completed (determined as "NO" in step S114). Note that the control device 90 may determine that the selection is complete by turning on the automatic start switch 90a13 after selecting the restart group.

In step S114, if any one of the selection buttons 90b1a, 90b1b, or 90b1c is selected, the control device 90 determines that the machining location to be resumed has been selected; otherwise, it determines that the machining location to be resumed has not been selected. In this way, in step S114, the machining location to be resumed (restart group) is selected (designated) (designation unit).

In step S116, the control device 90 resumes processing from the beginning of the selected (specified) processing group (processing resumption section). The control device 90 calculates the processing group corresponding to the selected processing group based on the sequence number where the abnormality occurred, which is stored in the memory device 90c. The control device 90 then resumes automatic operation from the beginning of the calculated processing group. In this embodiment, if an abnormality occurs at sequence number 22 and "From the stopped group" is selected, the control device 90 calculates processing group C containing sequence number 22 as the processing stop group based on sequence number 22, calculates processing group B immediately before the calculated processing stop group as the previous group, and calculates processing group D immediately after the calculated processing stop group as the next group. Since the selected processing group is the processing stop group, the control device 90 determines processing group C as the selected processing group. The control device 90 then resumes automatic operation from sequence number 18, which is the beginning of the determined processing group C.

The control device 90 continues automatic operation until the machining program is completed, i.e., until workpiece machining is completed (determined as "NO" in step S118), and terminates automatic operation when the machining program is completed and workpiece machining is completed (determined as "YES" in step S118).

In the above-described embodiment, a cutting tool is used as the processing tool, but other processing tools for processing the workpiece W may also be used. Furthermore, while a multi-tasking machine 1 is used as the workpiece processing device, this is not limited to this, and any device that processes the workpiece W may be used, and a simple lathe processing device or machining center may also be used.

In addition, in the above-described embodiment, when automatic operation (workpiece machining) is stopped due to the detection of an abnormality, automatic operation is resumed from the head of the machining group selected by the operator. However, it is also possible to resume machining from the head of the machining group where machining was stopped (machining stopped group) after the abnormality is resolved, without waiting for a selection. Specifically, the control device 90 (machining restart unit) omits the processing of steps S112 and S114 after the above-described step S110, and performs the processing of step S116. At this time, in step S116, the control device 90 resumes machining from the head of the machining stopped group (machining restart unit).

(Effects of this embodiment)
The workpiece machining device (multi-tasking machine 1) according to the embodiment described above includes a machining unit (controller 90; step S104) that performs machining of a workpiece W using machining tools (tools T) in accordance with a machining program divided into a plurality of machining groups, an abnormality detection unit (controller 90; step S106) that detects an abnormality during the machining by the control unit 90 (step S104; machining unit), a machining stop unit (controller 90; step S108) that stops the machining when the abnormality is detected by the control unit 90 (step S106; abnormality detection unit), and a machining restart unit (controller 90; step S116) that restarts the machining from the beginning of the machining group when the machining is stopped by the control unit 90 (step S108; machining stop unit).

According to this embodiment, in the multi-tasking machine 1, when the control device 90 (step S106; abnormality detection unit) detects an abnormality and the control device 90 (step S108; machining stop unit) stops machining, the control device 90 (step S116; machining restart unit) resumes machining from the beginning of the machining group into which the machining programs are grouped. This makes it possible for the multi-tasking machine 1 to resume machining from an appropriate position according to the grouping of the machining groups, and as a result, when a machining abnormality is detected, it becomes possible to resume machining from a more appropriate position.

In addition, in this embodiment, the processing groups are divided into groups based on the content of the processing. This makes it possible to resume processing from an appropriate position depending on the content of the processing.

In addition, in this embodiment, the processing content is the type of tool T. This makes it possible to resume processing from an appropriate position according to the type of tool T.

In addition, in this embodiment, the processing content is the processing area where the processing is performed. This makes it possible to resume processing from an appropriate position depending on the processing area.

In addition, in this embodiment, when the machining is stopped by the control device 90 (step S108; machining stop unit), the control device 90 (step S116; machining restart unit) restarts the machining from the beginning of the machining group where the machining was stopped. This makes it possible to reliably restart machining related to the program of the machining group that is currently being machined from the beginning.

In addition, in this embodiment, the multi-tasking machine 1 further includes a designation unit (controller 90; step S114) that allows the operator to designate the machining group for which machining is to be resumed, and when the machining is stopped by the controller 90 (step S108; machining stop unit), the controller 90 (step S116; machining resumption unit) resumes the machining from the beginning of the machining group designated by the controller 90 (step S116; designation unit). This makes it possible to resume machining from an appropriate position according to the operator's judgment.

1...Multi-tasking machine (workpiece machining device), 90...Control device (machining section; step S104, abnormality detection section; step S106, machining stop section; step S108, machining restart section; step S116, designation section; step S114), T...Machining tool (tool), W...Workpiece.

Claims (5)

a machining unit that performs machining of a workpiece using a machining tool according to machining programs grouped into a plurality of machining groups;
an abnormality detection unit that detects an abnormality during the processing by the processing unit;
a processing stop unit that stops the processing when the abnormality is detected by the abnormality detection unit;
a machining restart unit that restarts the machining from the beginning of the machining group when the machining is stopped by the machining stop unit;
a display unit that displays a restart group selection screen on a display device to allow an operator to select a restart group that is the machining group to restart the machining;
Equipped with
The display unit of the workpiece machining device displays the machining program, the plurality of machining groups corresponding to the machining program, and the location where the abnormality occurred on the restart group selection screen . a machining unit that performs machining of a workpiece using a machining tool according to machining programs grouped into a plurality of machining groups;
an abnormality detection unit that detects an abnormality during the processing by the processing unit;
a processing stop unit that stops the processing when the abnormality is detected by the abnormality detection unit;
a machining restart unit that restarts the machining from the beginning of the machining group when the machining is stopped by the machining stop unit;
a display unit that displays a restart group selection screen on a display device to allow an operator to select a restart group that is the machining group to restart the machining;
Equipped with
The display unit displays the machining program, the multiple machining groups corresponding to the machining program, and the location where the abnormality occurred on the restart group selection screen, and displays selection buttons corresponding to each of the multiple machining groups . 3. The workpiece machining device according to claim 1, wherein the machining groups are grouped according to the type of the machining tool or the machining portion on which the machining is performed. The workpiece machining device according to any one of claims 1 to 3, wherein the machining restart unit restarts the machining from the head of the machining group where the machining was stopped when the machining stop unit stops the machining. a designation unit that allows the operator to designate the restart group by referring to the restart group selection screen displayed on the display device,
The workpiece machining device according to any one of claims 1 to 3, wherein the machining restart unit restarts the machining from the beginning of the restart group designated by the designation unit when the machining is stopped by the machining stop unit.