JPH06155244A - Tool life monitoring method - Google Patents

Abstract

(57) [Summary] [Purpose] In a processing machine such as a full-automatic punching machine for flat plates, tool damage due to tool life or sudden trouble is prevented in advance, and continuous processing is possible for a long time. [Construction] N of a processing machine equipped with a spindle head 13 on which a tool is mounted and an automatic tool changing device 9 for changing a tool.
The machining limit value for each tool type and the load current limit value for each tool type of the spindle drive motor are registered in advance in the C control device 18. In this NC control device 18, the machining cumulative value up to the present of the tool is obtained, and the current load current value of the spindle drive motor is detected. When either one of the values exceeds the set value, the tool automatic changing device 9 automatically changes the tool. This enables continuous processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for monitoring the life of a tool such as a drill in a fully automatic drilling machine for drilling a single flat plate or a plurality of stacked flat plates with a drill.

[0002]

2. Description of the Related Art There are various types of drilling drills for drilling holes in flat plates such as gusset splice plates. Conventional drilling machines have a spindle head of a drill at the center of a fixed table. It is known that a clamp device for gripping a work is provided so as to reciprocate in the left-right direction of the main body along a fixed table, and an automatic tool changing device is provided near the spindle head. At the time of processing, a work is carried in to one end side of the fixed table, clamped by a clamp device and conveyed below the spindle head, and when the work is completed, it is carried out to the other end side of the fixed table.

[0003]

However, in the conventional drilling machine as described above, the automatic tool changing device is a device which simply replaces the drill when the machining content is changed, and the tool life is accurately measured. It is not possible to quickly replace a drill that has detected and reached the end of its tool life. Further, even if there is a sudden trouble, it cannot be detected and tool damage cannot be prevented in advance. When troubles such as tool breakage occur, the machine will be stopped for a long time,
It causes a lot of damage.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to prevent in advance tool damage due to tool life and sudden trouble, and enable continuous machining for a long time. It is to provide a tool life monitoring method.

[0005]

SUMMARY OF THE INVENTION A tool life monitoring method of the present invention includes a spindle head on which a tool is mounted, a tool automatic changing device for changing the tool, and an NC control device for controlling these. In the above, in the NC control device, the machining limit value for each tool type and the load current limit value for each tool type of the spindle drive motor are registered in advance, and the NC control device accumulates machining up to the present time of the tool. A value is obtained, and the current load current value of the spindle drive motor is monitored and compared with each of the set machining limit value and the set load current limit value, and when either one of the values exceeds the set value, the -Tools are automatically changed by a tool automatic changer.

[0006]

In the above structure, the NC control device has a machining limit value such as a machining cumulative length that differs depending on, for example, a high speed drill or a coating drill, and a load current limit value that varies depending on the drill diameter of the spindle drive motor. It is registered, and this NC control device calculates a cumulative machining value of the drill and the like from the plate thickness and the number of machined workpieces up to the present, and also monitors the current load current value of the spindle drive motor. When the machining cumulative value exceeds the set machining limit value, or when the load current value exceeds the load current limit value, the tool is automatically changed by the tool automatic changer. Thereby, the processing can be continuously performed for a long time.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an illustrated embodiment. This is an example in which one or more rectangular flat plates such as gusset splice plates are stacked and applied to a fully automatic perforator. 1 and 2
Is a plan view showing the entire automatic punching machine for flat plates according to the present invention, a front view, FIG. 3 and FIG. 4 are front views showing a loading side work stocker, side views, FIG. 5 and FIG. 6 are planes showing a work positioning device. Drawing, front view, Drawing 7, Drawing 8 are sectional views showing an automatic clamp device and a work fixing device, a top view, Drawing 9 is a sectional view showing a shift mechanism of an automatic clamp device, and Drawing 10 is a schematic diagram showing the shift state. 11 and 12 are a side view, a plan view and FIG. 1 showing an automatic tool changing device and an automatic tool measuring device.
3 and 14 are a plan view and a front view showing the work separating device.

As shown in FIGS. 1 and 2, the flat plate automatic punching machine is roughly classified into a punching machine body 1, a carry-in side work stocker 2, a carry-in feeder 3, a carry-out feeder 4 and a carry-out side work. The punching machine main body 1 includes a stocker 5, a work positioning device 6, an automatic clamping device 7, a work fixing device 8, a tool automatic changing device 9, a tool automatic measuring device 10, a work separating device 11, an NC control device 18, and the like. Is installed.

The punching machine main body 1 extends in the left-right direction (X-axis direction) of the main body, and has a fixed table 12 in which a large number of roll-shaped support rods 12a are arranged at intervals in the X-axis direction, and the fixed table 12. The drill D is placed in the center of the table 12 in the X-axis direction.
Is equipped with a spindle head 13 having a spindle on which is mounted. On the upper surface of the fixed table 12, the working area A is below the spindle head 13, the work loading standby area B is on the right side of the processing area A, and the work unloading standby area C is on the left side.

The main spindle head 13 has a spindle motor for rotating the main spindle, and is attached to a head base 14 so as to be movable in the vertical direction (Z-axis direction) of the main body. The head base 14 is a gate-shaped column 15 that straddles the fixed table 12.
Is attached to the upper horizontal beam of the unit so as to be movable in the front-rear direction (Y-axis direction) of the body. Further, the automatic clamp device 7 is capable of reciprocating in the X-axis direction on the side portion of the fixed table 12 by a drive mechanism housed in the telescopic cover 16.

Therefore, in the processing area A, the spindle head 1
By moving 3 in the Y-axis direction and the work W in the X-axis direction by the automatic clamping device 7, the drilling position for the work can be changed. Further, the work W can be transported from the work loading standby area B to the processing area A and from the processing area A to the work loading standby area C by the automatic clamping device 7. The movements in the X, Y, and Z axis directions are performed by a general-purpose linear guide, an AC servomotor, and a ball screw shaft.

The carry-in side work stocker 2 is installed parallel to the Y-axis on the carry-in side of the punching machine, accommodates a plurality of stacks of a large number of works W, and stores the work below the suction part of the carry-in feeder 3 which will be described later. The pallet 20 is a device that sequentially supplies mountains, and drives the pallet 20 on which a work W is loaded, a uniaxial movement control pallet 20, a linear guide including a pair of guide rails 21 parallel to the Y axis, and a slider 22 on the bottom surface of the pallet. The hydraulic cylinder 23 is provided. The hydraulic cylinder 23 is arranged between the guide rails 21, and the tip of its piston rod is connected to the lower surface of the pallet.

Further, in this embodiment, six vertical bar members 24 for origin are projected on the pallet 20 in the Y-axis direction at an equal pitch, and six work stations are formed. In case of maximum size workpiece W ₁ , use 2 stations to 3
In the case of the mountain and the minimum size work W ₂ , six mountains can be loaded using each station. The large work W ₁ is positioned on every other vertical member 24, and the small work W ₂ is positioned on each vertical bar 24 by applying its corners. Further, a plurality of supporting rods 25 are provided at the same position as the vertical member 24 for the origin to prevent the work mountain from collapsing. The support rod 25 is detachably attached between the pair of mounting members 26 so that unnecessary portions can be removed.

In such a loading-side work stocker 2, the movement control of the pallet 20 is performed based on the size of the work W input to the NC control device 18.
First, the pallet 20 is position-adjusted and moved for suction position control of the carry-in feeder 3 which will be described later, and then, when the first one mountain is taken out, the pallet 20 is moved by a predetermined stroke corresponding to the work, and the carry-in feeder 3 is moved. The next mountain is located below the adsorption part. This moving stroke is equivalent to 2 pitches of the vertical member 24 for the origin in the large work W ₁ .
For a small work W ₂ , the pitch is 1 pitch.

As shown in FIGS. 3 and 4, the carry-in feeder 3 picks up and picks up the works W one by one from the pallet 20, and places the work carry-in standby area B on the fixed table 10.
And a feeder main body 30 that reciprocates in the X-axis direction and a feeder protrusion 3 of the feeder main body 30.
1, a magnet main body 33 that is vertically movable in the Z-axis direction and has a plurality of electric magnets 32 provided at the bottom.

The feeder main body 30 includes a linear guide rail 34a parallel to the X-axis of a pair of upper and lower guide devices 34 attached to the rear rising portion 1a of the punching machine main body 1, and a slider 34b attached to the feeder main body 30. A ball screw shaft 3 which is guided and supported by a guide, is arranged above the guide device 34, and is driven to rotate by an AC servomotor 35 (see FIGS. 1 and 2) and parallel to the X axis.
Move by 6.

The magnet main body 33 has a guide rod 33A projecting upward with a sufficient length, and the guide rod 33A is attached to the feeder protrusion 31 by a linear guide including a guide rail 33a and a slider 33b. , So that the magnet main body 33 is fixed to the feeder protrusion 3
It can move up and down with respect to 1. The driving device is a hydraulic cylinder 37 with a linear encoder, the lower part of which is fixed to the feeder protrusion 31 and the tip of the piston rod is connected to the upper part of the magnet body 33. As the linear encoder, a general-purpose encoder including a detection head provided on a piston or a piston rod and a magnetic or optical scale is used.

The magnet body is separated into a magnet body 33-1 for a large work piece and a magnet body 33-2 for a small work piece, each of which has a guide rod 33A and the like, and a hydraulic cylinder 37- 1, 37-2
It is possible to move up and down individually. The magnet body 33-1 is wide and the electric magnets 32 are arranged in two rows, and the magnet body 33-2 is arranged in one row.

The feeder main body 30 reciprocating in the X-axis direction is provided with a power / communication cable from the punching machine main body 1 side.
A hydraulic cable or the like is supplied by a cable carrier 38 (see FIG. 1), and the magnet bodies 33-1 and 33-2 that move up and down from the feeder protrusion 31 side are provided with a box 31a and a cable carrier 39 (see FIG. 3) for power and communication. Cables etc. are connected.

Further, the feeder protrusion 31 of the carry-in feeder 3 is fixed to the feeder main body 30 and the magnet main body 33 cannot be shift-adjusted in the Y-axis direction. A feeder movable body 3 attached to the feeder main body 30 so as to be movable in the axial direction.
It may be 1 '(see FIG. 3 (b)). In this case, the feeder movable body 31 ′ is guided and supported by a pair of upper and lower guide rails 90 provided on the front surface of the feeder main body 30 and parallel to the Y-axis, and a slider 91 attached to the feeder movable body 31 ′. It is moved by a cylinder (not shown).

In such a feeding feeder 3, N
Based on the size (length / width / thickness) of the work and the number of stacked plates input to the C control device 18, the attraction position control / falling control of the magnet is performed. First, one of the two magnet bodies 33-1 and 33-2 is selected according to the size of the work, and then the feeder body 30 is placed so that the attraction center of the magnet body 33 coincides with the center of gravity of the work W on the pallet. Is moved in the X-axis direction, and the pallet 20 is moved in the Y-axis direction (if the feeder movable body 31 'is adopted, the feeder movable body 31' is moved).
3 is positioned in the plane with respect to the work W. The positional relationship between the attraction center of the magnet body 33 and the vertical member (origin) 24 is known, and the moving distance can be obtained by calculating the barycentric position from the work size.

Next, when the attraction position control is completed, the magnet main body 33 is lowered and the first (topmost) work is picked up, but the height of the work is different for each peak and is unknown, so the work is lowered at a low speed. A workpiece is detected by a proximity switch, a limit switch, etc. attached to the lower surface of the magnet body 33, and the descending is stopped. At this time, the linear encoder detects the distance to the uppermost work, and the second work calculates the sum of the detected distance and the input plate thickness to obtain the descending distance. While comparing the current descent distance with the current descent distance, the descent is performed at a high speed, and then the deceleration is performed at the front to adsorb the work. This process is repeated for each work pile to take out the work.

In the work loading standby area B,
Although the magnet main body 33 is lowered from the upper limit position to load the works, since the distance from the upper limit position to the upper surface of the fixed table 12 is known, the first work is controlled to descend using the set distance, and the second work is moved. After that, the plate thickness and the number of sheets are reduced to the above distance to perform the descending control. When a predetermined number of stacked plates are loaded with works, the next process is completed and the work carry-in standby area B is stopped until it becomes empty.

As shown in FIGS. 5 and 6, the work positioning device 6 is installed in the work carry-in standby area B, and when a predetermined number of sheets have been carried in by the carry-in feeder 3, the work control device 6 receives a command from the NC control device 18. Is a device for aligning the positions of the origin block 40 and the pusher 41 in the X-axis direction.
And a pusher 42 in the Y-axis direction. The origin block 40 is capable of projecting and retracting between the support rods 12a of the fixed table 12 by a cylinder, and is projected to serve as a positioning reference regardless of the size of the work. Further, when the work W is carried into the processing area A, it is buried in the fixed table 12.

The pusher 41 in the X-axis direction is a guide rail 4 attached to the rear rising portion 1a of the punching machine body 1.
3a and a slider 43b attached to the pusher 41 make it linearly movable in the X-axis direction, and moved by a hydraulic cylinder 44 to hold the work W together with the origin block 40 to align the ends in the X-axis direction. The pusher 42 in the Y-axis direction is installed in the front portion of the fixed table 12, and the lower portion of the guide rod 42A is guided and supported in the Y-axis direction by the guide rail 46a and the slider 46b.
5, the work W is moved, and the work W is automatically clamped by a later-described clamping device 7.
It is clamped together with the hydraulic clamper 50, and the ends in the Y-axis direction are aligned.

The automatic clamping device 7 grasps the side portion of the work W by a plurality of hydraulic clampers 50 for processing movement or conveyance, and also enables the clamp position to be automatically adjusted even if the size of the work W is different. It is a device. Figure 4
As shown in FIG. 5, the plurality of hydraulic clampers 50 are attached to movable plates 51, respectively, and the movable plates 51 are moved by a linear guide composed of a guide rail 52 and a slider 53 to move the X-axis.
The ball screw shaft 54 is movably guided and supported in the axial direction, and is moved in the X-axis direction by a ball screw shaft 54 which is rotationally driven by an AC servomotor (not shown).

As shown in FIGS. 7 and 8, in the hydraulic clamper 50, the movable claw 57 is attached to the movable member 56 that moves up and down by the hydraulic cylinder 55, and the fixed claw 58 is attached to the cylinder side to fix the movable claw 57 to the movable claw 57. The claw 58 holds one work piece or a plurality of stacked work pieces. The hydraulic clamper 50 itself includes a guide rail 59a and a slider 59.
The work W is attached to a movable plate 51 so as to be vertically movable via b and the hydraulic clamper 50 itself is lifted by a hydraulic cylinder 60 so that the work W can be slightly lifted from the fixed table 12 and conveyed.

Further, each hydraulic clamper (four in this embodiment) 50 is also shifted relative to each other in accordance with the size of the work so that the position can be automatically adjusted.
That is, as shown in FIG. 9, only the first movable plate 51-1 of the first clamper 50-1 is screwed to the ball screw shaft 54, and the movable plates 51-2 to 51-4 of the other clampers are screwed. Without using the two hydraulic cylinders 61 for the first movable plate 51-1.
It can be moved by 62.

The first cylinder 61 has its front portion fixed to the first movable plate 51-1 and its piston rod tip is connected to the second movable plate 51-2 via a pin. Further, the third movable plate 51-3 and the fourth movable plate 51-4 are integrated, and the piston rod tip of the second cylinder 62 fixed to the fourth movable plate 51-4 is attached to the second movable plate 51-2 by a pin. Connect through. Therefore, each movable plate 51 has cylinders 61, 6
They are integrated by 2 and are moved as a whole by the ball screw shaft 54, and are shifted and adjusted in position by the cylinders 61 and 62.

FIG. 10 (i) shows the first and second cylinders 61, 6
2 is contracted, and from this state, the second cylinder 6
When 2 is extended, the state shown in FIG. 10 (ii) is obtained, and when the first cylinder 61 is extended from this state, the state shown in FIG. 10 (iii) is obtained, and three clamping intervals can be obtained depending on the size of the work.

In such an automatic clamp device 7,
The first and second cylinders 61 and 62 are selectively driven and controlled based on the size (length) of the work input to the NC control device 18 to automatically set an appropriate clamp position corresponding to the size of the work. Obtained. When positioning by the work positioning device 6 is completed, the hydraulic clamper 70
Is operated, and then the servo motor of the ball screw shaft 54 is driven for transportation.

The work fixing device 8 is installed in the machining area A and clamps and fixes the work W together with the automatic clamping device 7 during machining. As shown in FIG. 7 and FIG. A pair of guide rails 71 arranged between the hydraulic clamper 70 having the same structure as the hydraulic clamper 50 and the support rod 12a for guiding the hydraulic clamper 70 in the Y-axis direction so that the hydraulic clamper 70 can move forward and backward, and fixed to the front surface of the fixed table 12, It is composed of a hydraulic cylinder 72 for moving the hydraulic clamper 70 forward and backward. The hydraulic clamper 70 is a drill D.
It is arranged so as to grip the side portion of the work at the position.

The automatic tool changing device 9 is arranged in the rear center of the rear rising portion 1a of the punching machine body 1 as shown in FIG.
As shown in FIG. 12, it comprises a storage table 80 for accommodating a plurality of drills and rotating for indexing. This storage table 8
0 is arranged so that the center of rotation coincides with the drill position of the spindle head 13, and a drill D such as a high speed drill or a coating drill is sandwiched by a pair of springs 81 in a storage notch 80a of the storage table 80 and is detachably attached. Is stored.

In response to a drill replacement command from the NC control device 18, the spindle head 13 moves in the Y-axis direction, the used drill D is stored in the storage cutout 80a, and then the storage table 80 rotates for the next machining. The drill D of
It is attached to the spindle. Incidentally, the attachment of the drill to the spindle of the spindle head 13 is of a normal pull stud type.

The automatic tool measuring device 10 is a device which is arranged on the spindle head side of the automatic tool changing device 9 and automatically measures the length of the drill D that has been replaced. It is composed of a tracing stylus 86 that abuts on the center of the tip of D, and a linear encoder of magnetic type or the like that accurately detects the moving distance of the tracing stylus 86. The measured drill length is input to the NC control device 18, and the machining data such as the machining feed distance is automatically corrected. If it is shorter than the predetermined drill length, replace it with the next drill.

Further, in the automatic tool changing device 9 as described above, the NC control device 18 monitors the tool life.
That is, the NC control device 18 has registered the tool life (cumulative machining length) of high-speed drills, coating drills, etc., for example, 7 m for high-speed drills and 12 m for coating drills. Compare the Further, in order to prevent the tool from being damaged due to a sudden trouble in advance, the load current value of the spindle motor for the spindle is monitored and compared with the load current value (which differs depending on the drill diameter) that is obtained and registered in advance. If either the cumulative machining length or the load current value exceeds the set value, the tool will be changed automatically.

The carry-out feeder 4 and the carry-out side work stocker 5 have the same structure as the carry-in feeder 3 and the carry-in side work stocker 2, and the carry-out operation is the reverse of the carry-in operation. The works are adsorbed one by one and transferred onto the pallet 20. However, since the work in the work carry-out standby area C cannot move in the Y-axis direction like the work on the pallet, the feeder main body 30 ′ of the carry-out feeder 4 has a feeder movable body 31 ′ (FIG. 3) that moves in the Y-axis direction. (See (b)) is provided so that the attraction position of the magnet can be controlled according to the size of the work.

In such a unloading feeder 4,
Two magnet bodies 33- according to the size of the work
After selecting one of 1, 33-2, the magnet body 33
The feeder main body 30 is moved in the X-axis direction and the feeder movable body 31 'is moved in the Y-axis direction so that the attraction center of the magnet W coincides with the center of gravity of the work W on the work unloading waiting area C, and the magnet main body 33 is moved to the work W. On the other hand, it is positioned in the plane.

Next, when the attraction position control is completed, the magnet body 33 is lowered and the first (uppermost) workpiece is picked up. This descending distance is known from the upper limit position of the magnet body 33, the distance to the upper surface of the fixed table 12, the plate thickness and the number of sheets, and can be descended at high speed from the beginning.

In the unloading side work stocker 5, the pallet 20 moves according to the size of the work W, and the station is positioned below the magnet body 33. The magnet body 3 can be loaded and unloaded on the pallet 20 as well.
Since the distance between the upper limit position of 3 and the upper surface of the pallet 20 is known, it is possible to descend at a high speed from the beginning.

As shown in FIGS. 13 and 14, the work separating device 11 is installed in the work carry-out standby area C, cuts burrs after drilling, removes cutting fluid, and separates the works one by one. This is a device that prevents the suction error of the work.
That is, the workpieces W that have been carried in from the processing area A and stacked are in a state of being in close contact with the processing burr between the plates caused by the hole processing and the cutting fluid, and when this is sucked out by the unloading feeder 4, Multiple workpieces are taken out and an accident occurs such that the workpieces fall during transportation.

Such a work separating device 11 is composed of a separating origin block 100 and a separating pusher 101. The separation origin block 100 is a member that serves as a positioning reference regardless of the size of the work,
A space between the support rods 12a of the fixed table 12 can be retracted by a cylinder, and a sloping surface 100a inclined in the up-down direction is formed on the unloading side surface with which the work W abuts. Further, an air injection device 102 having a plurality of nozzles 102a arranged at intervals in the Y-axis direction is provided in the upper part so that air can be blown into the gap between the works.

The separating pusher 101 is movable in the X-axis direction by a linear guide 103 and a hydraulic cylinder 104, and a sloped surface 100 is formed on the surface on the loading side where the work W abuts.
A sloped surface 101a parallel to a is formed. The guide rail 103a of the linear guide and the hydraulic cylinder 104 are arranged in front of the fixed table 12, the slider 103b of the linear guide is attached to one end of the separation pusher 101, and the separation pusher 101 is cantilevered. It is designed to be able to move over 12.

Work W after processing in work unloading standby area C
When a predetermined number of sheets have been stacked, the separation origin block 100 moves up in response to a command from the NC controller 18, and then the separation pusher 101 moves to press the work. The workpieces are deviated one by one by the inclined surfaces 100a and 101a, and the machining burrs are cut off. Next, separation origin block 1
00 descends, at this time, the air from the nozzle 102a is blown into the gap between the works, the cutting fluid is removed, and the works are sequentially separated from the top. By the above operation, a suction error can be prevented when the carry-out feeder 4 carries out the product.

The NC control device 18 is a device that controls each of the above devices by a stored program by graphic image input / G code input and performs processing while monitoring / correcting. The automatic continuous operation is as follows. Done.

<Workpiece Loading> (1) A workpiece carried by a conveyor (not shown) is transferred onto the pallet 20 by a loading robot or the like or manually. (2) Input the length / width / thickness of the work, the number of layers, and the drill diameter into the NC control device 18, and activate each device.

(3) The magnet main body 33 is selected according to the size of the work, the feeder main body 30 is further shifted in the X-axis direction, and the pallet 20 is shifted in the Y-axis direction so that the attraction center and the center of gravity of the work coincide. (4) The magnet main body 33 descends at a low speed by the hydraulic cylinder 37, and the first electric magnet 32 excites the first magnet.
One work piece on the top of the mountain is adsorbed. On this occasion,
The distance to the topmost work is detected.

(5) After the magnet main body 33 moves up and is stopped at the upper limit position, the feeder main body 30 moves to the spindle head side. (6) When the work carrying-in standby area B is reached, the magnet body 33 is lowered to demagnetize the electric magnet 32 to transfer the work onto the fixed table 12. (7) Repeat the above work removal and loading. From the first detection distance of the work and the plate thickness, the take-down / fall distance of the next magnet body 33 can be known, and at the second and subsequent times, the work is taken out and lowered at a high speed. As a result, the work can be taken out and carried in quickly.

(8) When a predetermined number of works are carried into the work carry-in standby area B, the Y-axis direction end portions are aligned with the hydraulic clamper 50 of the automatic clamp device 7 and the Y-axis direction pusher 42, and then the work is moved up. The origin block 40 and the pusher 41 in the X-axis direction align the ends in the X-axis direction. (9) The hydraulic clamper 50 is automatically moved and adjusted in position according to the size of the work, and the side portion of the work is gripped by the hydraulic clamper 50 and the origin block 4
After the 0 and pushers 41, 42 are retracted, the work is conveyed to the processing area A.

<Working of Work> (1) When the work is carried into the working area A, the hydraulic clamper 70 of the work fixing device 8 moves to grip the side portion of the work. (2) The work is the hydraulic clamper 50 of the automatic clamp device 7.
And the drill D selected by the input drill diameter while being fixed by the hydraulic clamper 70 of the work fixing device 8.
Drilling is performed by. The drill length of the drill D is measured by the automatic tool measuring device 10, and the drilling data is surely processed by the corrected machining data.

(3) The workpiece fixing device 8 is released, the workpiece is moved in the X-axis direction by the automatic clamping device 7, and the spindle head 13 is moved in the Y-axis direction, whereby the next machining position is determined. . As a result, a plurality of drilling processes are performed. (4) During the processing of this work, the next work is carried into the work carry-in standby area B in the same process as described above.

<Workpiece Unloading> (1) The workpiece that has been processed is unloaded to the workpiece unloading standby position C by the automatic clamp device 7. (2) The automatic clamp device 7 releases the hydraulic clamper 50 and returns to the work loading standby area A. The workpiece which has already been carried in is positioned and then clamped and conveyed to the processing area A.

(3) The workpieces in the workpiece carry-out standby area C are carried out one by one onto the pallet 20 of the carry-out side work stocker 5 by the carry-out feeder 4. The size of the magnet main body 33 of the unloading feeder 4 is selected according to the size of the work, and the size of the work can be changed by moving the feeder main body 30 in the X-axis direction and the feeder movable body 31 ′ in the Y-axis direction. The suction position control is performed according to the above, and the work W on the fixed table 12 is sucked. When the magnet main body 33 is lowered on the pallet 20, since the descending distance is known, loading and unloading is performed at high speed.

(4) The workpieces stacked in the workpiece unloading standby area C are completely separated one by one by the workpiece separating device 11, and can be taken out one by one by the unloading feeder 4 to prevent the workpieces from falling. Accidents can be prevented. (5) The work on the pallet 20 is transferred to a carry-out conveyor or carried out by a carry-out robot or the like or manually.

The above-mentioned steps are automatically repeated, so that the work is unmanned and continuously processed for a long time. The NC control unit 18 calculates the cumulative machining length of the drill D from the plate thickness and the number of machining pieces, and monitors the load current value of the motor of the spindle head 13, and when either exceeds the set value, The drill is automatically replaced, and good machining can be continued, and tool damage can be prevented in advance. This enables continuous processing for a long time.

In the above, the fully automatic punching machine for flat plates using a drill has been described, but needless to say, the present invention can be applied to other processing machines as well.

[0057]

As described above, according to the present invention, the cumulative machining value of the tool up to the present and the current load current value of the spindle drive motor are set to the machining limit value and spindle for each tool type registered in the NC controller. The load current limit value for each type of tool of the drive motor is compared, and if either one exceeds the set value, the tool is automatically changed by the automatic tool changer, so good processing is performed. In addition to being able to continue, tool damage due to tool life or sudden trouble can be prevented in advance, and continuous machining for a long time becomes possible.

[Brief description of drawings]

FIG. 1 is a plan view showing an entire automatic punching machine for flat plates according to the present invention.

FIG. 2 is a front view showing the whole of the flat plate fully automatic punching machine of FIG.

FIG. 3A is a front view showing a carry-in feeder, and FIG. 3B is a front view showing an example in which a movable portion is provided in the feeder main body.

FIG. 4 is a side view of FIG.

FIG. 5 is a plan view showing a work positioning device.

FIG. 6 is a front view showing a work positioning device.

FIG. 7 is a sectional view showing an automatic clamp device and a work fixing device.

FIG. 8 is a plan view showing an automatic clamp device and a work fixing device.

FIG. 9 is a sectional view showing a shift mechanism of the automatic clamp device.

FIG. 10 is a schematic diagram showing a shift state of FIG.

FIG. 11 is a side view showing an automatic tool changing device and an automatic tool measuring device.

FIG. 12 is a plan view showing an automatic tool changing device and an automatic tool measuring device.

FIG. 13 is a plan view showing a work separating device.

FIG. 14 is a front view showing a work separating device.

[Explanation of symbols]

 A processing area B work loading standby area C work unloading standby area W work D drill 1 punching machine body 2 loading side work stocker 3 loading feeder 4 unloading feeder 5 unloading side work stocker 6 work positioning device 7 automatic clamping device 8 work fixing Device 9 Automatic tool changing device 10 Automatic tool measuring device 11 Work separation device 12 Fixed table 13 Spindle head 18 NC control device 80 Storage table 86 Measuring element

Claims (1)

[Claims] 1. A machining machine comprising a spindle head on which a tool is mounted, a tool automatic changing device for changing the tool, and an NC control device for controlling these, wherein the NC control device performs machining for each type of tool. The limit value and the load current limit value for each tool type of the spindle drive motor are registered in advance, the machining cumulative value of the tool up to the present is obtained by the NC controller, and the current load current of the spindle drive motor is obtained. The value is monitored and compared with each of the set machining limit value and the set load current limit value, and when either one of the values exceeds the set value, the tool is automatically replaced by the tool automatic changer. A tool life monitoring method characterized by the above.