JPS63150107A - Control method for shearing in flying shear - Google Patents

Abstract

PURPOSE:To improve the shearing accuracy by providing a material passage detecter at the position where the passage of a material to be sheared can be detected after the acceleration of a flying shear is finished and directly recognize a material position before shearing for adjusting the rotating speed of a shear and correcting the tracking error of the material. CONSTITUTION:A contact A is closed so that a reference rotating speed is inputted into the speed controller 12 of a motor 7 for driving a shear while a flying shear 15 is started so that a rotary drum 5 is rotated. With the advance of a material 1 to be sheared, the tip 1T of the material 1 is detected with a second detecter 9 and at this time the position of a shering blade 6 on the rotary drum 5 is read. At the same time the correcting speed V in the reference rotating speed of the motor 7 is calculated by the specified expression for closing the contact B. The signal of the correcting speed V in the reference rotating speed is outputted from the controller 12. In order that the timings when the blade 6 and the shearing position of the material 1 reach the shearing point PB respectively are coincident with each other, the reference rotating speed is corrected with the correcting speed V so that it is possible to improve the shearing accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cutting control method for a running cutting machine that cuts a moving material at a preset cutting position.

[Conventional technology]

Figure 3 shows an outline of the line around the running cutting machine.

In the figure, 1 is a material to be cut, 2 is a length measuring roll for detecting the traveling speed of the material to be cut, and 3 is a speed detector.

It is attached to the length measuring roll 2 and detects the speed of the material to be cut 1. Reference numeral 4 denotes a workpiece passage detector for detecting passage of the leading or trailing end of the workpiece 1, 15 is a running cutting machine, and 5 is a rotating drum thereof, which is provided in pairs above and below. 6 is a cutting blade attached to the rotary drum 5; 7 is a ridge motor that rotates the rotating drum 5 through a speed reducer 16; 8 is a cutting blade position detector attached to the electric motor 7; The position of the blade 6 is detected.

The distance from the workpiece passage detector 4 to the cutting point pB by the cutting blade 6 of the rotating drum 5 is calculated, and the rotational movement distance from the waiting position Ps of the cutting blade 6 to the cutting point PB is LF3.
+Cut V [If the cutting length from the tip IT of the material 1 to the cutting position IC is Ll, the cutting of the material 1 is performed as follows.

First, the workpiece 1 is transported in the direction of the arrow X, and after a predetermined period of time from the time when its tip IT passes the workpiece passage detector 4, the electric motor 7 is started to rotate the rotary drum 5 km.
do. Due to this drive, the cutting blade 6 is accelerated from the waiting position P8 in the direction of arrow Y to a speed that leads at a certain ratio to the conveyance speed of the material to be cut 1, and after the acceleration is completed, the cutting blade 6 is When the tip IT has moved a distance of (L + L1) from the material detector 4, the cutting blade 6 reaches the cutting point FB, and the cutting blade 6 reaches the cutting point FB.
The material to be cut 1 is cut at the cutting position IC with a length of l.

FIG. 4 shows the speed V of the workpiece 1 after the tip IT of the workpiece 1 passes the workpiece passage detector 4, and the circumferential speed K of the cutting blade 6.
v is expressed by plotting time t on the horizontal axis, and the % line segment a is the speed of the material 1 to be cut.

The line segment represents the change in peripheral speed of the cutting blade 6. The speed of the material to be cut l is v1, the acceleration of the cutting blade 6 is α, and the 17-F ratio of the material to be cut 6 relative to the transport speed of the material to be cut V when cutting the material is K.
In this case, if the tip IT of the workpiece 1 passes the workpiece passing detector 4 at time 0 and a start command is given to the motor 7 at time ttK, then the tip IT of the workpiece 1 passes the workpiece passing detector 4 at time t4. Assuming that the cutting position IC located at a distance of Ll is to be cut, the following relationship holds true with attention to the amount of movement of the material to be cut 1 between times t and t4. That is, from FIG. 4, time t, -
The moving distance of the material to be cut during t4 is L + L, =AGHO... (1), and the right side of equation (1) is composed of three parts as shown below.

Mouth AGHO=mouth A 'B K O+ro BOJK+ro OG
HJ (2) Each term on the right side of equation (2) can be expressed by the following equations.

Mouth BOJK=vX△t-(4)Ro0G
HJ = Yu x Mouth O'FHJ = Yu (△O' E J + 0EFHJ) Therefore, from formula (1) + (2).

Therefore, in order to cut at the cutting position fytio located at a distance of Ll from the tip IT of the workpiece 1, the calculation of equation (7) is started, and when the left side and the right side become equal, the running cutting machine 5 By giving an activation command to the cutting blade 6, the material to be cut 1 is cut at a predetermined cutting position IC.

However, Δt is the difference between the running cutting machine driving electric motor 7 and the running cutting machine 5.
This is the response delay time from when the activation command is issued until the running cutter 5 actually starts.

[Problem that the invention seeks to solve]

According to the control system described above, it is completely unable to follow disturbances caused by changes in material speed after the cutting machine is started, variations in the starting timing of the cutting machine drive motor, etc., and it is not possible to improve cutting length accuracy. There were drawbacks.

In order to overcome these drawbacks, there are conventional techniques such as 1, as shown in Japanese Patent Publication No. 52-46627 and Japanese Patent Application Laid-open No. 55-5240, which are connected to the rolls of a roller table for transporting the material to be cut. There is a method of correcting the reference rotational speed of the drive motor according to the deviation of the position signals obtained by the material position detection device and the drum cutting blade position detection device to correct the error caused by the above-mentioned disturbance.

However, in such a cutting length control device, the material position is measured indirectly by the material speed detection device attached to the roller that is in contact with the material, so it may be affected by slip between the material and the roll, roll diameter settings, errors, etc. Detection errors of the speed detection device itself caused variations in cutting length.

The present invention has been made in view of the above circumstances, and eliminates variations in cutting length due to material speed detection errors and improves cutting accuracy without impairing the function of the running cutter, which must be started before the material reaches the material. A method for controlling a running cutting machine is provided.

[Means for solving problems]

The technical means of the present invention to solve the above problems is to determine the cutting position on the material to be cut on the upstream side of a running cutter in which cutting blades are arranged on the circumferential surfaces of opposing rotating drums, and ( - After a while, the traveling cutting machine is started, and the rotating column is accelerated at a cutting standard rotational speed. When the running cutting machine is turned on, the cutting position on the material to be cut is detected again at 1411, and this detected value and the method for transporting the material to be cut are used.
The reference rotational speed for cutting of the rotary drum is adjusted based on Ai and the position of the cutting blade on the circumferential surface of the rotary drum at the time of detection.

[For production]

In a traveling cutting machine, the cutting machine activation and cutting timing for the end cutting position of the material to be cut while traveling are determined in advance, and the cutting machine starts cutting the material to be cut in the transport path on the upstream side of the cutting machine. position f using an edge plane shape detector, width measuring device, etc.
The position to be directly detected or the position to be indirectly detected by a detector passing the leading and trailing ends of the longitudinal direction m1 of the material to be cut is set. This detection position must be located at least at a position that can secure at least the acceleration time from the starting rotation of the cutting blade of the cutting machine to the predetermined cutting standard rotational speed after detection, and the predetermined duration of the cutting standard rotational speed. There is. For this reason, tracking of the cutting position of the workpiece from the conveyance path position at the time of detection to the cutting point is performed indirectly from the conveyance roll rotation speed, etc. as described above, which causes errors.
Accordingly, the present invention solves the problem that cutting accuracy is low, and the resulting decrease in yield has no choice but to be given up.

That is, as shown in FIG.
A first workpiece passage detector 4, which detects the A-pass of the leading and trailing ends of the workpiece 1, is installed at At the time when the passage of the tip end φ of the material to be cut 1 is detected, the cutting position 1C of the material to be cut 1 is indirectly detected, and the cutting machine 1
In addition to determining the activation start and cutting timing of step 5, the cutting position IC is also tracked. Then, after starting the cutting machine 15 and accelerating it to a predetermined cutting reference rotation speed,
The second workpiece passage detector 9 detects again the passing of the leading and trailing ends of the actual workpiece 1 to determine the cutting position IC at that point, and when this point reaches the cutting point PB, Considering the distance, that is, L++ +T-r2, the transfer speed V of the material to be cut 1 at this point and the rotation speed K of the rotating rotating drum 5.
v and the rotational distance t8 from the position of the cutting blade 6 at this point to the cutting point of the cutting blade 6 at 28 inches, and based on these values, the reference rotational speed Kv for cutting of the rotary drum 5 is corrected. In this way, compared to the conventional cutting method in which the tracking of the cutting position is indirectly corrected by only detecting the speed of the material to be cut from the roll for transporting the material to be cut, The cutting accuracy of the first cutting position tIC can be greatly improved.

In FIG. 1, the rotary drum 5 of the running cutting machine 15 at the time when the second workpiece passage detector 9 (hereinafter referred to as second material detector 9) detects the passage of the tip end IT of the workpiece 1 Rotational distance k from the position of the cutting blade 6 to the cutting point PB
L2, the target cutting distance from the tip IT of the material to be cut 1 to the target cutting position LC is L1 + the transfer speed of the material to be cut 1 is V, and the cutting blade 6 is set so that the cutting blade 6 smoothly cuts the material.
If K is the lead rate with respect to the transport speed of the material to be cut, then the cutting blade reference rotational speed Vs is vB ``'' K v, so the time t8 at which the cutting blade reaches the cutting point is .

ts=lT3/Kv...(8) It is calculated as follows. On the other hand, from the time when the second material detector 9 detects the tip of the material to be cut 1, the cutting target position 10 is at the cutting point PB.
The time t2 required to reach .

It is determined by h = (L+ + L2)/V - (9). Therefore, in order for the cutting blade 6 to cut at the target cutting position IC, tB/Kv = (L+ 10L2) /v - CI
It is sufficient if the cutting blade 6 is located in the positional relationship Q.

However, due to the tracking error of the cutting position If10 as described above, the above relationship does not necessarily hold true.

If it passes through as it is, it will be cut with an error remaining. Therefore, at the time when the second material detector 9 detects the tip IT of the material to be cut l, the position of the rotating cutting blade 6 that has already reached the reference rotational speed is recognized, and the rotation from that position to the cutting point PB is performed. By correcting the reference rotational speed of the cutting blade of the electric motor for driving the cutting machine based on the difference between the distance ts and the moving distance of the workpiece 1 from the cutting position IC to the cutting point PB, the cutting point is With PB, the cutting position 10 of the material to be cut 1 and the cutting blade 6 can be aligned. In other words, if we expand these into mathematical relationships and show them.

Zs/(Kv+Δv) = (Ll+L2)/v
...(1υyos△v=v×(LB/(Lt 10L)
2) A rotational speed correction amount ΔV of K) .=U may be added to the reference rotational speed of the electric motor for driving the cutting machine.

In the @ formula, target cutting distance of the material to be cut (distance between the cutting position of the material to be cut and the cutting point) Lq and the transport speed of the material to be cut V
The rotational lead rate of the cutting blade 6 with respect to L is a constant that is preset before cutting according to the dimensions of the workpiece 1 during operation, and is approximately L, = O ~ 100.
, is about 1.0 to 1.15. Further, the distance L2 from the second material detector 9 to the cutting point is also a constant determined by the position of the second material detector 9, and the passage of the material is detected after the rotational acceleration of the cutting blade 6 of the running cutter 15 is completed. In order to do this, the transfer speed V of the material to be cut 1 is 2 [rrL/] and the rotational acceleration change α of the cutting blade 6 is 3.142 [frL/!]. ,a! 2]
, if the cutting blade rotational movement distance L8 from the cutting blade waiting position to the cutting point is 1.34 [m], then the cutting blade position immediately after rotational acceleration of the cutting blade to the reference rotational speed KvK is completed to the cutting point. Rotational travel time to PB is 350 [m5ec]
The distance L from the second material detector 9 to the cutting point 1 is
2 becomes o and 7 [m].

〔Example〕

Next, the embodiment shown in FIG. 2 will be described. Components in FIG. 2 with the same reference numerals as those in FIG. 1 represent the same components.

Reference numeral 9 denotes a $2 material detector, which is installed just before the entry side of the inter-travel cutting machine 5, and detects passage of the material to be cut 1 after the cutting machine 5 completes acceleration. Reference numeral 10 denotes a speed correction amount calculator, which calculates the amount of correction for the reference rotational speed of the rotary drum 5 determined by the output 4 from the cutting blade position detection device 8 at the time when the tip IT of the material to be cut is detected by the second material detector 9. is output to the electric motor 7 for driving the cutting machine. Reference numeral 11 denotes an arithmetic unit, which receives the signal from the first material detector 4 and calculates the starting timing of the inter-travel cutting machine 15 and the reference rotational speed of the electric motor 7 for driving the cutting machine. 12 is a speed control device for the electric motor 7 for driving the cutting machine. 1
3.14 are setting devices for the cutting machine lead rate and target cutting length, respectively.

From the moment the first material detector 4 detects the tip IT of the material to be cut 1, the calculation of equation (7) is performed, and at the timing when the left side and right side of equation (7) match, the contact person is closed and cutting is performed. A reference rotational speed is applied to the speed control device 12 of the machine drive electric motor 7, the cutting machine 15 is started, and the rotating drum 5 is rotated. As the material to be cut 1 enters, the second material detector 9 detects the tip IT of the material to be cut, and the position of the cutting blade 6 on the rotating drum at this point is read, and at the same time, the above-mentioned equation (2) is executed. By performing the calculation and closing contact B,
A reference rotational speed correction signal is output to the speed control device 12. In other words, the reference rotation speed is corrected by calculating Δvf so that the time points at which the cutting blade 6 and the cutting position IC of the workpiece 1 reach the cutting point PB coincide with each other immediately after reaching the reference rotation speed. Therefore, the cutting accuracy of the material to be cut 1 can be dramatically improved.

To simplify the explanation, the explanation focused on the behavior when cutting the leading end of the material to be cut, but the above @formula also applies when cutting the trailing end: Δv=vX(tB/(Lz Ll)K) ・= 0
The idea is the same, just 2.

〔Effect of the invention〕

As explained above, the present invention includes a material detector that is installed upstream of a running cutting machine to detect the passage of a material to be cut, and a material detector that detects the passing of a material to be cut again after the acceleration of the running cutting machine is completed. A similar material detector is installed at the same position to directly detect the material position after the inter-travel cutter completes acceleration and immediately before cutting the material, adjust the rotation speed of the cutter, and correct material tracking errors. This eliminates variations in cutting length due to material speed detection errors and improves cutting efficiency without impairing the function of the running cutter, which is started before the material reaches the material.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of the main parts to explain the operation of the cutting control method of the present invention, FIG. 2 is an operation explanatory diagram showing one embodiment of the present invention, and FIG. 3 is a schematic side view showing the conventional cutting method. 4 are graphs showing the relationship between the speed of the material to be cut and the circumferential speed of the cutting blade. ■... Material to be cut, 10... Cutting position, 4... First
Detector for passage of material to be cut, 5...rotating drum, 6...
cutting blade. 9...Second material passage detector, 15...Tracking cutter. Agent Patent attorney Masaaki Akizawa Mitsunobu 1 name, 1 illustration

Claims (1)

[Claims] The cutting position on the material to be cut is determined on the upstream side of a traveling cutting machine with cutting blades arranged on the circumferential surface of opposing rotating drums.Then, the traveling cutting machine is started, and the rotating drum is rotated at the reference rotation for cutting. In the cutting method of cutting the material by accelerating the rotary drum to a cutting speed, after accelerating the rotating drum to a reference rotational speed for cutting, detecting the cutting position on the material to be cut again on the entry side of the running cutter;
A running time characterized in that the reference rotational speed for cutting of the rotary drum is adjusted based on this detected value, the transport speed of the material to be cut, and the position of the cutting blade on the circumferential surface of the rotary drum at the time of the detection. Cutting control method for cutting machine.