JPS632722B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a running cutting machine that cuts a pipe material, which is processed into a pipe material from a plate material, with a knife while the machine is running.

<Background> In a pipe-making line where plate materials are run, formed into a tubular shape, and then welded, a flat blade is pressed down by a press while the product, the pipe material, is running.
A so-called press cut is used to cut a small diameter pipe, and a large diameter pipe is not cut by a press cut because the end of the pipe is crushed. This is because it is virtually impossible to insert the blade into the pipe while facing the blade using the medium size as a stopper. For this reason, running cuts for large pipe materials are often made with a saw. Cutting with a saw takes a relatively long time and requires a large cutting machine because the saw movement is significant. If an attempt is made to shorten the cutting time, high heat will be generated, which will not only burn the tube end, but also shorten the life of the saw.Also, the cut surface will not be clean and it will be necessary to chamfer and remove burrs after cutting. Moreover, when cutting with a saw, the chips are scattered as sparks, which cannot be prevented even with a cover, causing loud noises and worsening the working environment. Instead of a saw, there is a cutting machine that rotates a rotary disk such as a Soroban ball while pressing it against it. In this case, the cutting surface and working environment are improved, but it is extremely expensive and takes a long cutting time, just like a saw.

<Summary of the Invention> An object of the present invention is to provide a running cutting machine capable of shearing a plate material into a tube material in a press cut type even when the diameter of the tube material is not small while traveling.

According to this invention, a middle mold is inserted as a guard from the open part before it becomes a pipe material, and the middle mold is movable in the running direction of the pipe material. On the other hand, the movement of the pipe material and the movement of the cutter are respectively detected, and by inputting these detection outputs and the set cutting length, the movement component of the cutter along the direction of movement of the pipe material is calculated with the pipe material protruding from the cutter by the set cutting length. The blade is controlled by a turret servo mechanism so as to synchronize with the movement, and in this state the blade cuts the pipe material. Furthermore, the movement of the medium size is detected, and the medium size movement detection output and the movement component of the cutter in the pipe material movement direction are inputted, and the medium size servo is set so that the medium size follows the movement of the cutter in the pipe material travel direction at least during cutting. The mechanism is configured.
Make sure to cut the tubing just outside the medium end face.
By initializing the medium size and cutter in advance, it is possible to shear even pipe materials with a diameter that is not small by press cutting.

<Example> FIG. 1 shows an example of a running cutting machine according to the present invention. Board material 11 such as iron plate or vinyl board is indicated by arrow 12
As shown in the figure, while traveling from left to right in the figure, both side edges are sequentially bent to fit together by multi-stage forming rolls (so-called forming rolls), and the joined side edges, that is, the seam, are welded by a welding machine 13.
A round tube material is obtained by welding, and then a square tube material is obtained by rolling down the upper, lower, left and right forming rolls (so-called sizing rolls). These molding devices are omitted in the figure.
The figure shows the case of a reciprocating type running cutting machine 15, in which the pipe material 14 runs between an upper blade 16 and a lower blade 17, and these upper blades 16 and lower blades 17 reciprocate in the running direction of the pipe material 14. The pipe material 14 can be cut under pressure by a running press. A rack 19 is connected to a tool rest 18 that holds the blades 16 and 17 together, and a pinion 21 is connected to the rack 19.
are meshing. The rotation of the motor 22 is controlled by the reducer 23
is transmitted to the pinion 21 via.

A turret servo mechanism 24 is provided which positions the turret during travel to a set cutting length via this motor and controls the movement component of the turret 18 in the direction of movement of the tube during cutting to follow the travel of the tube 14. This servo system will be explained in detail below. A roll 25 is rolled into contact with the pipe material 14, and the rotation of the roll 25 causes the encoder 26 to
is driven, and the encoder 26 generates a pulse every time the tube 14 moves by a unit length, and the movement of the tube 14 is detected. The pulses of the encoder 26 are counted by a length measuring counter 27 to detect the moving length of the tube 14, and are also supplied to a frequency-voltage converter 28 to detect the moving speed of the tube 14.

The encoder 29 is driven by the rotation of the motor 22, and a pulse is generated every time the tool post 18 moves by a unit length. The pulses from the encoder 29 are supplied to a counter 31 and a frequency-to-voltage converter 32 to detect the moving length and moving speed of the blades 16 and 17, respectively. Cutting length set in the cutting length setting device 33
L ₀ and the count values L ₁ and L ₂ of the counters 27 and 31 are respectively supplied to the adder 34 to calculate L ₀ −L ₁ +L ₂ . This value is the so-called remaining length. After this remaining length is converted into an analog signal by the DA converter 35, this analog signal is sent to the frequency voltage converter 2.
8 is subtracted by an analog adder 36 and becomes a speed reference for the motor 22 in the pipe material running direction.

When the length of the pipe material 14 protruding from the tool rest 18 approaches the cutting length L ₀ , the sign of the output of the analog adder 36 becomes positive, which is detected by the sign detector 37 , and the sign detector 37 switches the switch 38 to the analog Switch to the adder 36 side. Therefore, analog adder 3
6 is supplied to the analog adder 39 as a speed reference, and subtracted from the output of the frequency-voltage converter 32, that is, the speed feedback signal, and the output is given to the motor 22 through the amplifier circuit 41, so that the motor 22 rotates in the forward direction. At the start, the tool rest 18 starts moving forward in the same direction as the traveling of the tube 14, accelerates toward the moving speed of the tube 14, and then a cutting command is issued to the press. When the remaining length becomes almost zero and the speeds of the tool rest 18 and the pipe material 14 are synchronized, the press is activated by the previous cutting command and the blade 16 is pressed down.

Next, the length measurement counter 27 is reset in response to a signal confirming the completion of cutting from the cam switch of the press, and accordingly, the sign of the output of the analog adder 36 becomes negative, this is detected by the sign detector 37, and the switch 38 is switched to the DA converter 42 side. While the tool rest 18 is moving forward in the running direction of the tube material 14, the pulses of the encoder 29 are also added and counted by the reversible counter 43, that is, the length of advance of the tool rest 18 is counted. Reversible counter 4
The count value of 3 is converted into an analog signal by the DA converter 42, and its output is supplied to the analog adder 39 through the switch 38. Since the polarity is set so that the advance length is a negative speed reference, the motor 22 is reversed. The turret 18 moves back and the reversible counter 43
When the count value approaches zero, that is, approaches the home position, the motor decelerates to a stop and enters a standby state until the next start of forward movement.

In this invention, the intermediate die 44 is inserted into the tube 14 from the stage before being processed into a tube, that is, from the plate 11 side, and is made to be able to move back and forth along the running direction of the tube 14 in close proximity to the tool post 18. That is, pipe material 1
For example, a driving rod 45 is inserted into the inside of the tube 14, one end of which is fixed to the medium 44, and the other end of which is connected to the plate 1 from the pipe 14.
It protrudes on one side, and a rack 46 is connected to its protruding end. A pinion 47 meshes with the rack 46, and the pinion 47 is rotated by a motor 48.

A medium-sized servo mechanism 49 is provided which causes the medium size 44 to follow the movement component of the tool post 18 in the pipe material running direction via this motor. An embodiment of this servo system will be described in detail below. That is, the pulses of the encoder 29 are supplied to the counter 51 and the frequency-voltage converter 52, and the moving length and moving speed of the tool rest 18 are detected. On the other hand, the encoder 53 is driven by the motor 48, and its pulses are supplied to a counter 54 and a frequency-voltage converter 55, so that the moving length and moving speed of the medium 44 are detected, respectively. Each count value of the counters 51 and 54 is supplied to an adder 56 to detect the positional deviation between the medium and the tool rest, and the output thereof is supplied to a DA converter 57 and converted to an analog signal. It is added to the output of the frequency-voltage converter 52 to become a speed reference, and at the same time the output of the frequency converter 55, that is, the speed feedback, is subtracted, and the output of the analog adder 58 drives the motor 48 through the amplifier circuit 59. As a result, the medium die 44 moves following the moving length and speed of the tool rest 18 in the pipe material running direction.

The counters 51 and 54 are both reversible counters, and the medium 44 follows not only when the tool post 18 moves in the same direction as the pipe traveling direction, but also when the tool post 18 returns to the home by moving in the opposite direction. and return by the same length. The positions of the tool post 18 and the medium 44 on the platform are detected by origin sensors 61 and 62,
It is safe to perform absolute positioning by resetting the contents of the counters 51 and 54 with that signal.

In this way, when the tool rest 18 moves together with the pipe material 14 to cut the pipe material 14, the blades 16, 1
Since the medium size 44 is located close to the tube 7, even if the tube material 14 is large, it can be sheared by press cutting. Although a simple stopper has been described as a mechanism for the medium size, this invention also makes it possible to attach blades to the medium size and use the upper and lower blades of the tool rest 18 as outer molds to shear in conjunction with the medium size. In this case, the shape of the cut can be further improved. Instead of the outputs of the counter 51 and the frequency-voltage converter 52, the outputs of the counter 43 and the frequency-voltage converter 32 may be used, respectively. Not only when shearing the pipe material 14 by press-cutting, but also when using a saw as a cutting tool, the existence of the medium size 44 allows the saw to be strongly pressed against the thin-walled pipe material 14 while cutting, thereby shortening the cutting time. It is possible to do this. Further, the present invention can be applied not only to the above-mentioned reciprocating type cutting machine but also to a rotary traveling type cutting machine disclosed in Japanese Patent Publication No. 57-51123, for example.

[Brief explanation of the drawing]

The figure is a block diagram showing an example of a running cutting machine according to the present invention. 11: plate material, 14: pipe material, 15: running cutting machine,
26: Encoder for detecting movement of pipe material, 24: Turret servo mechanism, 29: Encoder for detecting movement of tool post, 48: Medium-sized movement motor, 49: Medium-sized servo mechanism.

Claims (1)

[Claims] 1. In a running cutting machine that cuts the pipe material that is processed from plate material into pipe material while moving, the cutting tool follows the movement of the pipe material, and the pipe material is inserted into the pipe material from the open part before it becomes the pipe material. A medium size, a moving means for reciprocating the medium size along the pipe moving direction, a medium size movement detection means for detecting movement of the medium size, and a medium size movement detecting means for detecting a component of movement of the table to which the cutter is attached in the pipe material running direction. Based on the tool post movement detection means, the pipe material movement detection means for detecting the movement of the pipe material, the output of the pipe material movement detection means, the output of the tool post movement detection means, and the cutting setting length, at least the above cutting setting is determined. a turret servo mechanism that controls the movement of the turret so that the pipe material and the blade are in speed synchronization when cutting the pipe material at a length; an output of the turret movement detection means; and an output of the medium-sized movement detection means. is supplied, and at least while the cutter is in contact with the pipe material, the medium-sized servo mechanism controls the medium-sized moving means so as to control the moving direction component of the pipe material movement of the tool post. A running cutting machine characterized by: