JP2023026327A - Machining apparatus, control method, and program - Google Patents

Abstract

To provide a machining apparatus, control method, and program capable of making the machining suspension due to a decrease of an air pressure, hardly occur.SOLUTION: In order to solve the problem, a machining apparatus 100 of the present invention includes: a main shaft 11 that retains and rotates a tool 12; a control unit 85 that controls the rotation of the main shaft 11; and an air pressure detection sensor 301 that detects an air pressure of air for use in cooling the main shaft 11. The control unit 85 determines, based on the number of rotations of the main shaft 11 and a result of the detection by the air pressure detection sensor 301, whether or not to continue machining.SELECTED DRAWING: Figure 7

Description

The present invention relates to a processing apparatus, a control method, and a program for processing an object to be processed using a tool.

It is well known in machining equipment to supply compressed air to cool the spindle and to prevent chips from entering the spindle.

If the air pressure of the spindle cooling air by compressed air is insufficient, it may not be possible to sufficiently cool the spindle and prevent the inflow of chips. is equipped with an air pressure detection sensor for For example, in order to prevent insufficient air pressure, a method is known in which a sufficient air pressure can be supplied by switching flow paths as in Patent Document 1.

JP 2010-201535 A

However, if the air compressor is shared with other devices or if air is blown out from multiple locations at the same time, the air pressure may drop temporarily. In the past, when the air pressure dropped, the processing would stop halfway when the substrate firmware received an error indicating insufficient air pressure.

INDUSTRIAL APPLICABILITY The present invention can provide a processing apparatus, a control method, and a program that make it difficult for processing to stop midway due to a decrease in air pressure.

In order to solve the above-described problems, the processing apparatus of the present invention detects a main spindle that holds a tool and rotates, a control unit that controls the rotation of the main spindle, and an air pressure of air for cooling the main spindle. and an air pressure detection sensor, wherein the control unit determines whether or not to continue machining according to the rotational speed of the spindle and the detection result of the air pressure detection sensor.

Further, in order to solve the above-described problems, a control method for a machining apparatus according to the present invention is a control method for a machining apparatus including a control unit for controlling rotation of a spindle that rotates a tool, wherein the spindle is cooled. and a step of determining whether or not to continue machining according to the detection result of the rotational speed of the spindle and the air pressure.

According to the present invention, by monitoring the rotation speed of the main spindle, if the rotation speed of the main spindle is equal to or less than the predetermined rotation speed, machining can be continued even if the air pressure drops, and the machining is unlikely to be stopped in the middle.

1 is an external perspective view of a processing apparatus according to one embodiment of the present invention; FIG. The perspective view of the internal structure in the processing apparatus which concerns on embodiment. 1 is a schematic cross-sectional view of an electrical unit according to an embodiment; FIG. 4A and 4B are views showing the air blow portion of the spindle according to the embodiment (FIG. 4A is a perspective view and FIG. 4B is a cross-sectional view); FIG. 2 is a control block diagram in the processing device according to the embodiment; Block diagram of compressed air supply according to the embodiment Flowchart for monitoring rotation speed and determining whether or not processing can be continued according to an embodiment Flowchart for determining whether or not to perform an air blow after a specific sequence according to an embodiment Flowchart of sticking detection according to the embodiment Flowchart until return-to-origin is started according to the embodiment

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below based on embodiments.

<Embodiment>
A processing apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. FIG. 1 is an external perspective view of a processing apparatus according to one embodiment of the present invention.

As shown in FIG. 1, the processing apparatus 100 accommodates a processing apparatus main body within an exterior cover 101 . The exterior cover 101 has an opening/closing door 102, and by opening the opening/closing door 102, the work can be replaced.

The processing apparatus 100 supports a frame 1 as a moving mechanism support member, a first moving mechanism 10, a second moving mechanism 20, and a third moving mechanism 30 supported by the frame 1, and a work W as an object to be processed. a support mechanism 40 , a first rotation mechanism (rotation mechanism) 50 and a second rotation mechanism (another rotation mechanism) 60 capable of rotating the support mechanism 40 , a tool magazine 70 , and an electrical unit 80 .

The frame 1 is mounted on a base 2 having a cavity inside, and as shown in FIG. 4. In this embodiment, the first frame portion 3 is arranged along the vertical direction, and the second frame portion 4 is arranged along the horizontal direction. The second frame 4 may be configured by separating a portion along the Y-axis direction and a portion along the Z-axis direction, connecting them with screws or the like, and providing beams.

The first moving mechanism 10 is supported by the first surface 3a of the first frame portion 3 of the frame 1 via the second moving mechanism 20, and rotates the main shaft 11 in the Z-axis direction (vertical direction, first direction). It is movable. A processing tool 12 is detachably attached to the spindle 11 via a tool holder (clamp). The spindle 11 is rotationally driven by a motor 13 . As shown in FIG. 2, the first moving mechanism 10 has a motor 14 and a guide shaft (not shown) arranged in the Z-axis direction. Move back and forth (up and down) in the direction. The main shaft 11 is supported via a Z-axis support member 16 so as to be movable along the guide shaft. For example, the guide shaft is a ball screw, and the Z-axis support member 16 is a member that moves along the guide shaft (ball screw) that rotates when driven by the motor 14 . The guide shaft and Z-axis support member 16 are covered with a cover 17 .

The second moving mechanism 20 is supported on the first surface 3a of the first frame portion 3 of the frame 1, and moves the first moving mechanism 10 in the X-axis direction (horizontal direction, second direction) orthogonal to the Z-axis direction. The main shaft 11 can be moved together with . The second moving mechanism 20 has a motor 21 and a guide shaft (not shown) arranged in the X-axis direction, and driven by the motor 21 reciprocates the first moving mechanism 10 along the guide shaft in the X-axis direction. move. As with the first moving mechanism 10, the second moving mechanism 20 may also use, for example, a ball screw as a guide shaft.

The third moving mechanism 30 is supported on the second surface 4a of the second frame portion 4 of the frame 1, and supported in the Y-axis direction (horizontal direction, third direction) orthogonal to the Z-axis direction and the X-axis direction. Mechanism 40 is movable. The third moving mechanism 30 has a motor (not shown) and a guide shaft (not shown) arranged in the Y-axis direction, and the motor drives the support mechanism 40 to reciprocate along the guide shaft in the Y-axis direction. move. As with the first moving mechanism 10, the third moving mechanism 30 may also use, for example, a ball screw as a guide shaft.

The third moving mechanism 30 also includes a support plate portion 31 that supports the second rotation mechanism 60, and the support plate portion 31 reciprocates along the guide shaft in the Y-axis direction. As shown in FIG. 2, the support mechanism 40 side of the gantry 2 in the Y-axis direction is open. This prevents interference with the frame 2. The third moving mechanism 30 can move the support mechanism 40 in the Y-axis direction together with the second rotating mechanism 60 and the first rotating mechanism 50, as will be described later in detail.

The support mechanism 40 supports a work W as an object to be cut by the processing tool 12, such as a dental prosthesis. Such a support mechanism 40 includes a holding portion 41 that holds the work W, and a support portion 42 that is connected at both ends to the rotating portion 51 of the first rotating mechanism 50 and supports the work W via the holding portion 41. have The holding portion 41 and the support portion 42 are separate bodies, and the holding portion 41 is fixed to the support portion 42, as will be described later in detail. However, the holding portion 41 and the support portion 42 may be integrated.

The first rotation mechanism 50 can rotate the support mechanism 40 around an a-axis as a rotation axis orthogonal to the Z-axis direction. In this embodiment, the a-axis is parallel to the X-axis direction. Such a first rotating mechanism 50 has a support frame 53 that rotatably supports the rotating portion 51 and a motor that drives the rotating portion 51 to rotate. The support frame 53 is formed in a substantially U-shape so as to surround the periphery of the support mechanism 40, and includes a first support portion 53a that supports the motor and the rotating portion 51, and an unshown support portion that is provided to face the rotating portion 51. It is composed of a second support portion 53b that supports the rotating portion, and a connection portion 53c that connects the first support portion 53a and the second support portion 53b.

The rotating portion 51 supported by the first support portion 53a and the rotating portion supported by the second support portion 53b are arranged so as to face each other in the a-axis direction and are rotatable about the a-axis as a rotation axis. ing. Both ends of the support mechanism 40 in the a-axis direction are respectively supported by the rotating parts. Thereby, the first rotation mechanism 50 supports the support mechanism 40 so as to be rotatable about the a-axis.

The first rotating mechanism 50 can rotate at least 180 degrees and can turn over the workpiece W supported by the supporting mechanism 40 . In this embodiment, the first rotation mechanism 50 can rotate the support mechanism 40 by 360° around the a-axis.

The second rotating mechanism 60 can rotate the support mechanism 40 about the Z-axis direction and the b-axis as another rotating axis orthogonal to the a-axis. In this embodiment, the b-axis is parallel to the Y-axis direction. Such a second rotating mechanism 60 has a rotating portion to which the support frame 53 of the first rotating mechanism 50 is attached, and a motor that drives the rotating portion 61 to rotate. The connecting portion 53c of the support frame 53 is attached to the rotating portion 61, and the rotating portion 61 can rotate the support frame 53 around the b-axis by being rotationally driven by the motor 62. As shown in FIG. Therefore, the second rotation mechanism 60 supports the support mechanism 40 together with the first rotation mechanism 50 so as to be rotatable around the b-axis.

A tool magazine 70 as a tool holding section can hold a plurality of processing tools, is arranged adjacent to the first rotating mechanism 50 , and is supported so as not to rotate together with the second rotating mechanism 60 . Further, the tool magazine 70 can be moved in the Y-axis direction together with the support mechanism 40 and the like by the third moving mechanism 30 .

In the tool magazine 70, a plurality of types of processing tools formed integrally with the tool holders 12a are held and arranged in a plurality of rows along the Y-axis direction. The processing tool attached to the spindle 11 is replaceable. The tool holder 12a is a portion held by the spindle 11, and may be formed integrally with the processing tool or may be formed separately. In this embodiment, after the processing tool 12 is attached to the tool holder 12a with a chuck, the chuck portion for holding the tool of the spindle 11 holds the tool holder 12a via the tool holder 12a. . However, a processing tool may be attached directly to the spindle 11 . The replacement of the processing tool may be performed by an operator, or may be performed automatically by the processing apparatus 100 .

In the case of automatically exchanging the processing tools, the second moving mechanism 20 and the third moving mechanism 30 move an empty space in the tool magazine 70 in which no processing tools are contained below the spindle 11 . By lowering the main spindle 11 by the first moving mechanism 10 and operating a detachable device such as a chuck provided on the main spindle 11, the processing tool 12 attached to the main spindle 11 is removed and the empty space of the tool magazine 70 is removed. to be placed. Next, the first moving mechanism 10 raises the spindle 11, and the second moving mechanism 20 and the third moving mechanism 30 move the position of the tool magazine 70 where the processing tools 12 to be replaced are arranged below the spindle 11. . Then, the spindle 11 is lowered again by the first moving mechanism 10 and the attachment/detachment device is operated to attach the processing tool 12 to be replaced to the spindle 11 . In addition, the processing tool 12 is, for example, a drill or an end mill.

The electrical unit 80 is mounted inside a space surrounded by a rectangular parallelepiped including the maximum sides of the frame 1 in the XYZ directions. In other words, the electrical unit 80 is arranged on the opposite side of the first surface 3 a of the first frame portion 3 and on the opposite side of the second surface 4 a of the second frame portion 4 . By arranging the electric equipment unit 80 inside the L-shaped frame 1 where the moving mechanism and the rotating mechanism are not arranged, the space can be effectively used and the size of the device can be reduced.

The electrical unit 80 shown in FIG. 2 controls the processing apparatus 100, and as shown in detail in FIG. 84x, 84y, 84z are supported. The control board 83 controls driving of the motors of the main axis and each axis. Each of the control units 84a, 84b, 84c, 84x, 84y, and 84z, for example, calculates a pulse to be output to the motor from the signal of the rotary encoder of the corresponding motor, and appropriately controls the rotation of the corresponding motor. be. The controllers 84a, 84b, 84c, 84x, 84y, and 84z, which are servo amplifiers, rotate the motors corresponding to the NC code executed in the circuit of the control board 83 so that the positions and rotation speeds are indicated. Let

That is, the controller 84a controls the motor 54 of the first rotation mechanism 50 to rotate the support mechanism 40 around the a-axis. The control unit 84b controls the motor of the second rotation mechanism 60 to tilt the support mechanism 40 around the b-axis, thereby determining the posture of the support mechanism 40. FIG. The control unit 84x also controls the motor 21 of the second moving mechanism 20 to move the main shaft 11 in the X-axis direction, and determines the position of the main shaft 11 in the X-axis direction. The control unit 84y controls the motor of the third moving mechanism 30 to move the support mechanism 40 in the Y-axis direction, and determines the position of the support mechanism 40 in the Y-axis direction. The control unit 84z controls the motor 13 of the first moving mechanism 10 to move the main shaft 11 in the Z-axis direction, and determines the position of the main shaft 11 in the Z-axis direction. Thereby, the relative positions of the main shaft 11 and the support mechanism 40 on the X, Y, and Z axes are determined.

Moreover, the processing apparatus 100 of this embodiment is an NC processing apparatus that performs automatic processing under computer control. Specifically, machining data is created by a CAD/CAM system using an external terminal such as a personal computer, and the workpiece W is machined by numerical control based on this data. For this reason, an external terminal such as a personal computer that issues commands to the processing apparatus 100 is communicably connected to the control board 83 of the processing apparatus 100 . The external terminal may create the NC code according to the conditions and transmit it to the control board 83 . The processing apparatus 100 itself may be provided with a computer equipped with a CPU and a memory capable of numerical control.

For example, when creating a dental prosthesis with the processing apparatus 100, the data of the dental prosthesis measured by the three-dimensional measuring device is transferred to the CAD/CAM system, and processing data is created by the CAD/CAM system. Then, based on this processing data, the processing apparatus 100 is controlled to cut the workpiece W with the processing tool 12, thereby producing a dental prosthesis.

FIG. 4 will be described. The air blow portion 87 in FIG. 4( a ) is a part of the main shaft 11 . When compressed air is sent from an air inlet 122, air is blown from four air blowing ports 121 toward a tool provided at the tip of the spindle 11 to cool the tool and remove chips adhering to the tool. Since there are four air blowing ports 121, air can be applied to the entire tool. Of course, there may be four or more blower ports 121 .

FIG. 4B is a cross-sectional view of the blower port 121 of the air blower 87. As shown in FIG. The blowing port 121 has a narrow hole 124 on the blowing side which is provided so as to be inclined toward the main shaft 11 side with respect to the hole 123 on the air inlet side, so that the flow velocity of the blown air can be increased. The hole 124 on the blower side widens from the narrowed portion to the tip. This facilitates the manufacturing process of the blower port 121 .

As shown in FIG. 5, the electrical unit 80 includes a CPU 85 (controller) serving as computing means, an input/output port (I/O) 86i, motor controllers 84x, 84y, and 84z, spindle controllers 84c and a. It includes an axis controller 84a, a b-axis controller 84b, and the like. The CPU 85 provided on the control board 83 performs various calculations using the memory 86m based on the input data and signals, and controls the connected control units 84x, 84y, 84z, 84a, 84b, and 84c as servo amplifiers. to send rotation speed and position instructions.

The I/O 86i is connected to the air blower 87, the dust collector 88, and the tool length sensor 96 of the processing apparatus main body. The air blower 87 blows air to the tool as described above, and the removed chips are collected by the dust collector 88 . A tool length sensor 96 detects the length of the tool and sends a signal to the CPU 85 .

Control units 84 x , 84 y and 84 z for each motor drive the X, Y and Z motors based on commands from the CPU 85 . Encoders are provided in the controllers 84x, 84y, and 84z of the respective motors. The encoder detects, for example, the number of rotations, the rotation angle, and the rotation direction of the rotation shafts of the control units 84x, 84y, and 84z of each motor. Then, the amounts (positions) by which the stages x, y, and z are moved by driving the control units 84x, 84y, and 84z of the respective motors are detected.

The control unit 84c controls a motor (not shown) that rotates the main shaft 11 to control the rotational speed of the main shaft (spindle). The a-axis and b-axis control units 84 a and 84 b drive the a-axis and b-axis motors based on commands from the CPU 85 .

By controlling each part of the processing apparatus 100 by the CPU 85 in this manner, the workpiece W held as described above is processed in a predetermined manner.

The CPU 85 develops a program in a storage means such as the memory 86m and executes each means and process to be described later.

FIG. 5 is a control block diagram of the processing apparatus 100. As shown in FIG.

If the air pressure of the spindle cooling air does not satisfy the threshold value, the spindle controller 84c issues an air pressure shortage error. When the first air pressure detection sensor 301, which will be described later, detects insufficient air pressure and the spindle control unit 84c outputs an error of insufficient air pressure, the spindle may continue to inertially rotate. Therefore, apart from the first air pressure detection sensor 301, the processing machine is provided with a second air pressure detection sensor 302, which will be described later, for monitoring the air pressure supplied to the spindle control section 84c. By monitoring the air pressure with the second air pressure detection sensor 302, which sets a short threshold for the time from when the first air pressure detection sensor 301 detects an air pressure shortage to when an error is issued, the first air pressure detection sensor The second air pressure detection sensor 302 first detects an air pressure shortage error before the air pressure shortage error is generated by the sensor 301 so as not to cause the spindle to rotate due to inertia. As will be described later, a check valve 304 is provided in a path for supplying air to the first air pressure detection sensor 301 of the spindle control section 84c. Therefore, at the position where the first air pressure detection sensor 301 is provided downstream of the check valve 304 in the air path, the air pressure changes slowly. The second air pressure detection sensor 302, which is provided at a position where the check valve 304 is not provided (position where changes in air pressure are immediately reflected), is more sensitive to air pressure than the first air pressure detection sensor 301, which will be described later. A value close to the compressor air pressure is measured. With such a configuration, even if the first air pressure detection sensor 301 outputs an output value equal to or higher than the output value corresponding to insufficient air pressure, depending on the detection result of the second air pressure detection sensor 302, it may be better not to continue machining. There is

In the following examples, the threshold for detecting that the air pressure has decreased from the normal air pressure of 0.3 MPa is set to 0.25 MPa. The first air pressure detection sensor 301 outputs an error 4 seconds after reaching 0.25 MPa, while the second air pressure detection sensor 302 outputs an error 0.1 seconds after reaching 0.25 MPa. put out. Therefore, the second air pressure detection sensor 302 detects that the air pressure has decreased earlier than the first air pressure detection sensor 301 does. Further, the threshold value for detecting that the air pressure of the second air pressure detection sensor 302 has decreased is made larger than that of the first air pressure detection sensor 301, and the second air pressure detection sensor 302 detects that the first air pressure detection sensor You may make it detect that the air pressure fell earlier than 301. FIG.

A second air pressure detection sensor 302 monitors the air supplied to the spindle 11 . When the air pressure monitored by the second air pressure detection sensor 302 becomes lower than the threshold value, the CPU 85 confirms the rotation speed of the main shaft 11 . If the rotation speed of the spindle 11 is equal to or less than the predetermined value, machining is continued even if the spindle cooling air is low.

FIG. 6 is a block diagram of the compressed air supply.
Compressed air is supplied to each part of the processing machine 100 from the air compressor 200 .

A check valve 304 is provided in the path for supplying air to the first air pressure detection sensor 301 of the spindle controller 84c so that the spindle controller 84c does not immediately output an air pressure shortage error. As a result, air pressure fluctuations are moderated, and an air shortage error does not appear immediately, so the substrate firmware does not immediately stop processing. In addition, by monitoring the rotation speed of the spindle, it is determined whether or not machining can be continued even when the air pressure is low. A second air pressure detection sensor 302 measures the air pressure before entering the check valve 304 . Air for spindle cooling and nozzle air 303 for blowing toward a tool provided at the tip of the spindle are supplied by an air compressor 200 .

FIG. 7 is a flow chart for monitoring the number of revolutions and determining whether or not machining can be continued.

In S401, the CPU 85 determines whether or not the air pressure is lower than a predetermined threshold by detecting the second air pressure detection sensor 302 . If the air pressure is lower than the predetermined threshold value, proceed to S402. If the air pressure is equal to or higher than the predetermined threshold value, the process proceeds to S404 to continue machining.

In S402, the CPU 85 confirms the rotation speed of the main shaft. If the spindle speed is equal to or less than the default value of 30000 rpm, the process proceeds to S404 to continue machining. If the spindle speed exceeds 30000 rpm, the process proceeds to S403.

In S403, recovery of the air pressure is confirmed. If the air pressure recovers, the process proceeds to S404 to continue machining. If the air pressure does not recover, the process proceeds to S405.

In S405, the CPU 85 determines whether or not a certain period of time has elapsed since the air pressure became insufficient. Here, 1 minute is set as the fixed time. Until one minute elapses, the process returns to S403 to confirm whether or not the air pressure has recovered. If the air pressure does not recover after 1 minute, it will stop.
A function of the CPU 85 is used for a timer as a time measuring means for measuring time.

With the setting as described above, machining is continued unconditionally when the rotational speed is 30000 rpm or less.

When the number of revolutions exceeds 30000 rpm, processing is continued for a maximum of 1 minute. If the air pressure recovers during one minute, the machining is continued even after the recovery, and if the air pressure does not recover, the machining is stopped due to an air pressure shortage error.

In this embodiment, the waiting time until the air pressure recovers is set to 1 minute, but the length of the fixed time can be changed, and the specified value of the spindle speed can also be changed.

Air supplied from the air compressor is ejected as nozzle air 303 from the ejection hole 121 shown in FIG. The purpose of blowing the nozzle air 303 is to cool the cutting edge of the tool during machining, to remove chips adhered to the tool holder during tool replacement, and to remove chips adhered to the touch sensor during tool length measurement. is. Since the nozzle air 303 is blown out, the inside of the chamber is filled with chips, so after the end of the sequence in which the chips fly using the nozzle air 303, the spindle cooling air is blown out for a certain period of time to prevent chips from entering the spindle. can be prevented. At this time, if the dust is collected by the dust collector 88 and the chips in the storage are sucked, the chips are less likely to enter the spindle. Also, the user can change the continuation timer value for cooling air and dust collection after the end of the sequence in which chips fly.

It is also conceivable to close the main spindle chuck after the end of the sequence in which the chips fly, in order to reduce the entry path of the chips into the main spindle. The spindle chuck closes at the same time as the timer starts, and maintains the closed state of the spindle chuck even after the timer ends.

After the machining operation is finished, the timer is always started, and the spindle cooling air is blown and dust is collected by the dust collector 88 .

Tool change and tool length measurement are performed during machining, during homing, and by manual operation. When tool change and tool length measurement occur, it is determined whether they are being processed, returned to origin, or manually operated. If it occurs during machining, the spindle cooling air is being blown out, and machining is not finished, so machining is continued without activating the timer. When a tool change or tool length measurement occurs during return-to-origin or manual operation, a timer is started, spindle cooling air is blown, and dust is collected by the dust collector 88 . When an external dust collector is used as the dust collector, the dust collector may continue to operate during processing without interlocking air ejection and dust collection.

FIG. 8 is a flow chart for determining whether or not to perform an air blow after the sequence in which chips fly.

In S501, the CPU 85 determines whether or not the processing has ended. If the processing is finished, the process advances to S506 and ends after going through S507 and S508.

In S506, the spindle cooling air and dust collection are turned on, and the spindle chuck is closed.
In S507, it waits for the set timer to elapse.

In S508, as soon as the timer in S507 expires, the spindle cooling air and dust collection are turned off.

In S502, it is determined whether or not tool change or tool length measurement has been completed. If completed, the process proceeds to S503. If it has not ended, it ends without starting the timer.

In S503, it is determined whether or not the tool was changed during machining or the tool length was measured. If processing is in progress, the process ends without starting the timer. Otherwise, the process proceeds to S504.

In S504, it is determined whether or not there was a tool change or tool length measurement during return to origin. If the origin return is in progress, the process proceeds to S506. Otherwise, the process proceeds to S505.

In S505, it is determined whether or not the tool was changed manually or the tool length was measured. If it is manual operation, the process proceeds to S506. Otherwise, the process ends without starting the timer.

When the tool is gripped while chips remain on the tapered surface of the spindle 11, the tool may stick to the tapered surface. When tool sticking occurs, after the tool is stored in the tool magazine and the chuck provided on the main spindle 11 is opened, when the main spindle 11 is vibrated due to movement or the like, the tool may become stuck. may fall in unintended places. Therefore, by closing the chuck during movement, it is possible to prevent the tool from falling.

FIG. 9 shows a flow chart of sticking detection.

At the start, set the number indicating the number of sticking detections to 1. From S601 to S605, the processing apparatus 100 performs a tool storage operation. In S<b>601 , the CPU 85 drives the motors that drive the X-axis and Y-axis drive mechanisms, and moves the spindle 11 so that it is positioned above the tool magazine 70 . In S602, the motor that drives the Z-axis drive mechanism is driven to lower the spindle 11 to the tool release position. In S603, the chuck is opened and the tool releasing operation is executed. At this time, air may be discharged to facilitate release of the sticking tool.

In S604, after the tool is released, the stuck tool is made easier to release by waiting for a certain period of time with the chuck open. In S605, the Z-axis moves to the retracted position.

After releasing the tool in S606, the chuck is closed, and the XY axes move onto the tool length sensor 96 in S607. At this time, it is unknown whether the tool sticks to the spindle 11 or not, but since the chuck is closed, even if the tool sticks, the tool can be prevented from falling due to movement.

In S608, a tool detection operation is performed using the tool length sensor 96, which is a touch sensor. At this time, the CPU 85 determines the presence or absence of the tool based on the previous tool length detection position stored in the memory 86m. If there is no tool, it is judged in S609 that the tool is not stuck, and the machine is stopped normally. If there is a tool, it is determined in S609 that the tool is sticking, and the process proceeds to S610 to determine whether it is the first sticking. If it is the first time, the tool release is attempted again, so the numerical value indicating whether or not sticking is detected is incremented to 2, and sticking is detected, and the process returns to S601.

If the numerical value indicating the number of sticking detections is 2 in S610, it is determined that sticking has been detected for the second time. to move. At S612, the Z-axis is lowered by a predetermined amount and stopped at a position where the user can remove the tool, and the chuck is opened at S613. After that, in S614, the CPU 85 informs the user that the tool is in an error state and prompts the user to remove the tool. The predetermined amount refers to, for example, a 25 mm drop from the retracted position.

In addition, it is conceivable that the power of the processing apparatus 100 is turned off while the tool is stuck to the spindle 11 . Therefore, it is necessary to close the chuck to prevent the tool from dropping even when returning to the origin. However, if the power is turned off at a position where a tool can be gripped on the tool magazine 70, the return to origin is started from that position, and the chuck is closed, the tool is erroneously gripped when the tool is not stuck. It is conceivable that it will be lost. In such a case, by moving the Z-axis from the tool gripping position where the tool can be gripped on the tool magazine 70 and retreating to a position other than the tool gripping position, it is possible to prevent the tool from being gripped by mistake. .

FIG. 10 shows a flow chart up to the start of return to origin.

In S701, the CPU 85 issues an origin return start instruction. In S702, the CPU 85 determines whether origin setting is completed. If origin setting has been completed, it is determined in S703 whether the current position of the spindle 11 is above the tool magazine 70 or not. If it is on the tool magazine 70, the Z-axis is moved to the retracted position in S704, and then the chuck is closed in S705. If the origin setting is not completed, the accurate position of each axis cannot be acquired. Therefore, it is possible to tentatively grasp the tool by raising the Z-axis by a predetermined amount in S706 and closing the chuck in S707. To prevent a tool from being erroneously grasped when stopped at a certain position. For example, the predetermined amount is 5 mm.

After performing the origin return operation in S708, the CPU 85 controls the processing apparatus 100 to start the origin return operation in S709.

11 Spindle 12 Processing Tool 84c Spindle Control Unit 85 CPU
86m memory 87 air blow part 100 processing device (processing device)
301 First air pressure detection sensor 302 Second air pressure detection sensor

Claims (7)

a spindle that holds and rotates the tool;
a control unit that controls the rotation of the main shaft;
an air pressure detection sensor that detects air pressure of air for cooling the spindle,
The processing apparatus, wherein the control unit determines whether or not to continue processing according to the number of rotations of the spindle and the detection result of the air pressure detection sensor. The control unit stops machining when the number of rotations of the spindle is equal to or greater than a predetermined threshold and the detection result of the air pressure detection sensor is smaller than the predetermined threshold,
when the rotation speed of the main shaft is smaller than a predetermined threshold,
2. The processing apparatus according to claim 1, wherein processing is continued regardless of the detection result of said air pressure detection sensor. Furthermore, it comprises a timing means for measuring time,
In the control unit, when the number of revolutions of the main shaft is equal to or greater than a predetermined threshold value and the detection result of the air pressure detection sensor is smaller than the predetermined threshold value, the timer measures the elapse of the predetermined time. 3. The processing apparatus according to claim 1, wherein the processing is stopped after the processing is continued up to. a check valve provided in an air path of air supplied to the main shaft,
The air pressure detection sensor is
a first air pressure detection sensor provided downstream of the check valve;
a second air pressure detection sensor that detects the air pressure before entering the check valve;
When the output of the first air pressure detection sensor is equal to or higher than the output value corresponding to insufficient air pressure and the output of the second air pressure detection sensor is smaller than a predetermined threshold value,
2. The processing apparatus according to claim 1, wherein it is determined whether or not to continue processing. 2. The processing apparatus according to claim 1, wherein air for cooling said spindle is blown from an air blower provided on said spindle. A program that causes a computer to function as the controller of the processing apparatus according to any one of claims 1 to 5. A control method for a processing apparatus comprising a control unit for controlling rotation of a spindle that holds and rotates a tool, comprising:
an air pressure detection step of detecting an air pressure of air for cooling the spindle;
and determining whether or not to continue machining according to the rotational speed of the spindle and the detection result of the air pressure.

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