JPH1190726A - Traveling pipe cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-quality cutting end face without any level difference by simultaneously implementing a precutting and a cutting-off cutting by a same rotating cutting mechanism. SOLUTION: A pipe cutting mechanism 4 with a rotary shaft 3 rotated by a servo motor is attached to a slide mechanism. The rotary shaft 3 is provided with a semicircular precut blade A which notches and precuts the outer surface of a pipe P and has saw teeth in a relatively short tip part, and a semicircular main cut upper blade B which cuts off the front level of the pipe P and is longer than the precut blade A. This precut blade A precuts a pipe for cutting. Secondly, the servo motor is further rotated so that the main cut upper blade B which is positioned in the opposite side of the same single blade to which the precut blade A belongs and cutting-off cuts the pipe from the cut part cut by the precut blade A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling pipe cutting apparatus for cutting a pipe, which is formed by rolling a strip wound on a coil in a pipe production line and continuously fed, into a predetermined length at a high speed. It is about.

[0002]

2. Description of the Related Art Conventional general pipe cutting devices are disclosed in U.S. Pat. No. 4,228,706 and U.S. Pat.
As disclosed in No. 0, the tip of the speed synchronized with the traveling speed of the pipe is lowered into the upper blade having a triangular plate-like tip and driven into the pipe outer shape, and then the pipe set on the lower blade is removed. Cutting devices for cutting were the mainstream. However, such a pipe cutting device has the disadvantage that not only the dimple remains in the driving and cutting section, but also inefficiency, and the cutting yield is poor, and the driving mechanism of the cutting blade becomes large, so that the traveling pipe cutting mechanism as a whole. Was heavy and high-speed cutting was impossible. Therefore, many proposals have been made for a traveling pipe cutting device which is lightweight and capable of high-speed cutting. For example, Japanese Patent Application Laid-Open No. 59-201715
As disclosed in Japanese Unexamined Patent Publication, before the upper blade for full-scale cutting cuts into the pipe, a preliminary cut is made in the biting portion of the upper blade of the pipe by a top knife rotating on the pipe as a preliminary cutting. And Japanese Patent Laid-Open No. 3-21
As disclosed in Japanese Patent No. 3208, when the speed of the moving pipe is synchronized with that of the pipe cutting device, the turning locus of the cutting blade for making a shallow cut in the pipe is performed by the circular arc locus convex on the upper surface as well as the circular arc on the upper surface of the pipe. Then, a double action press cut system in which the cutting blade is completely cut has been proposed. Instead of this method, the upper blade moving at a speed synchronized with the speed of the pipe is lowered or rotated as disclosed in Japanese Patent Application Laid-Open No. 3-213208, and the diameter of the upper blade is reduced by 20% from the outer end face of the pipe. A single action cut method has been proposed in which a cut is made at a position deviated from the center of the pipe within the range described above, and then the entire diameter is cut. Further, recently, as disclosed in Japanese Patent Application Laid-Open No. 7-227712, a high-efficiency pipe cutting in which an upper blade and a cutting blade are integrally fixed and movable so that the upper blade and the cutting blade can be cut. Equipment has also been developed.

[0003]

However, in the double-action press-cut method described above, dimples are less likely to occur due to the preliminary cutting, but a separate cutting tool and a moving / rotating mechanism for the preliminary cutting are required. In addition to the fact that the overall structure of the apparatus is complicated and the cost is high due to the increase in size, the blades are different between pre-cutting and main cutting. There is a problem that a step is generated.
On the other hand, in the single action cut method,
The upper blade is a sharp, plate-like blade with a triangular tip or a similar curved shape.When this tip enters the outer surface of the pipe, the shearing force concentrates on the tip. Had caused dimples. This dimple still has the problem that the work value of the dimple reduces the commercial value of the pipe, so that the work is corrected in a later process, which requires extra steps and costs.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems. By performing pre-cutting, dimples at the pipe end are not generated, and at the same time, pre-cutting is performed by the same rotating single blade. The present invention provides a pipe cutting device having a high-quality cutting end surface with no steps by performing both of the main cutting in a single action, and also provides a low-cost pipe cutting device with simplified equipment. . The gist of this is that the traveling pipe cutting device synchronizes with the pipe forming speed of the pipe, precuts the pipe while running, and then cuts off the pipe without cutting. And
In a traveling pipe cutting device that performs pre-cutting of a pipe while running, and then performs cut-off press cutting, a pipe cutting mechanism is disposed apart from a pipe fixed to a pipe support table, and the pipe cutting mechanism performs a preliminary cut. The pre-cutting blade to be put in and the main cutting upper blade for parting-off press cutting have an integral blade structure having one rotation center, and the rotating shaft that is the center of rotation of the pre-cutting blade for pre-cutting and the main cutting upper blade for parting-off press cutting is linear. Shape, an arc shape or a slide mechanism that can slide and move on a locus that combines them, and before cutting the pipe, the upper part of the pipe where the tip of the main cutting upper blade first enters by rotating the preliminary cutting blade After precutting by making a preliminary cut from the pipe surface, rotation of the main cutting upper blade in another part of the same single blade to which the preliminary cutting blade belongs The rotation of varying heart is undeformed cutting traveling pipe cutting apparatus configured to perform parting cutting pipes set in the lower blade.

[0005] In the traveling pipe cutting apparatus for non-deformable cutting according to the present invention, the arrangement of the used pre-cutting blade and the pipe to be cut is changed depending on the shape of the main cutting blade. When the main cutting blade has an S-shape in which the rotation axis is located at the center in its shape,
The position of the pipe to be cut is positioned outside the preliminary cutting blade, and in the case of a half-moon shape in which the rotation axis is positioned at the center in the shape, the pipe to be cut is cut at the position of the pipe to be cut. A distance between an outer surface of a pipe to be cut at a length in a radial direction from a rotation center and a rotation axis of the slide mechanism, which is located between a rotation axis and the preliminary cutting blade and the main cutting upper blade. A pre-cutting blade having a length obtained by adding the depth to be pre-cut to the pipe, and at least the pipe diameter is added to the distance between the outer surface of the pipe to be cut at that length and the rotation axis of the slide mechanism. The main cutting blade has a length, and both the preliminary cutting blade and the main cutting blade are part of an integral blade structure having a single rotating shaft, so that during the precut, the cutting edge and the rotation center of the blade are extended. Disconnected The pipe is undeformed cutting traveling pipe cutting apparatus of claim 1 wherein the position.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A traveling pipe cutting apparatus according to the present invention comprises a pipe which is fed out of a pipe production line at a constant speed, and a pipe cutting apparatus which is controlled to run in synchronization with the feeding speed of the delivery pipe. The device makes a pre-cut by the rotary motion of the pre-cutting blade integrally attached to the single rotary blade, and immediately thereafter, the single rotary blade continues to rotate while its rotation center is integrally attached to the same single rotary blade. The upper cutting edge for main cutting is moved from the preliminary cutting portion to a position where a cut-off press cutting is performed by the rotation of the upper cutting blade to perform main cutting.
Immediately after the main cutting, the single rotary blade moves its rotation center to the original position, and the pipe cutting device main body returns to the original position and again performs the movement synchronized with the pipe feed speed for cutting again. The cycle of preliminary cutting and main cutting is repeated. The rotation of the single rotary blade in the preliminary cutting and the main cutting is performed by rotating a DC motor under computer control, and the movement of the rotation center is performed by moving on a rail or by a circular movement by a pin and an arm. Is controlled by a servo motor or the like.

Hereinafter, the details of the present invention will be specifically described with reference to the drawings. As shown in the side view of FIG. 1, the traveling type pipe cutting device according to the present invention is an example in which the preliminary cutting blade A and the main cutting upper blade have an S-shape, and the pipe to be cut is A horizontal pipe cutting lower blade 1 for fixing P, and a linear slide mechanism 2 spaced apart from the pipe cutting lower blade 1 while maintaining an interval described later and arranged at an arbitrary angle in the cross section of the pipe P; Are arranged. The slide mechanism 2 is provided with a pipe cutting mechanism 4 having a rotating shaft 3 that is driven to rotate by a servomotor (not shown). Both the slide mechanism 2 and the pipe cutting mechanism 4 are configured to cut the pipe while running in synchronization with the pipe forming speed. The pipe cutting mechanism 4 has a semi-moon-shaped pre-cut having a relatively short end with a saw blade for making a notch on the outer surface of the pipe P and pre-cutting the rotary shaft 3 supported by the slide mechanism 2. It is composed of a blade A (precut blade) and a two-piece integrally structured blade having a half-moon-shaped main cutting upper blade B longer than the preliminary cutting blade A for cutting off the entire cross section of the pipe P.

Therefore, before cutting the pipe P, a specific upper portion of the outer peripheral surface of the pipe, into which the tip of the main cutting upper blade B first enters, is preliminarily set on the rotating shaft 3 as a fulcrum by the rotational driving force of the servomotor. Pre-cutting is performed with the cutting blade A, and then, the servo motor is further rotated to drive the pre-cutting blade A by the main cutting upper blade B that cuts off the same single blade to which the pre-cutting blade A belongs on the opposite side. Is cut off from the cut portion (notch). Here, the positional relationship of the rotary shaft 3 when the pre-cutting of the pre-cutting blade A and the cut-off of the main cutting upper blade B will be described. As shown in FIG.
When the pre-cut is performed, the position of the rotating shaft 3 is at the position of the point X almost directly above the pipe P. However, when the main cutting upper blade B cuts off, the rotating shaft 3 moves down on the slide mechanism. Then, the traveling-type pipe cutting, which is fixed at the point Y so that the tip of the main cutting upper blade B is exactly at the pre-cut position, and is configured to cut off the pipe P almost from the middle, which is capable of non-deformable cutting. Device.

Further, in the traveling pipe cutting apparatus capable of non-deformable cutting according to the present invention, the arrangement of the pipe to be cut is changed depending on the shapes of the preliminary cutting blade and the main cutting blade to be used.
For example, when the preliminary cutting blade and the main cutting blade to be used have an S-shape in which the rotation axis is located at the center in the shape, the position of the pipe to be cut is positioned outside the preliminary cutting blade, In the case of a half-moon shape in which the rotation axis is located at the center in the shape, as shown in FIGS. 2A and 2B, the pipe to be cut at the position of the pipe to be cut is defined as the rotation axis of the slide mechanism. The pre-cutting blade and the main cutting upper blade are located between the pre-cutting blade and the main cutting upper blade, and the shapes of the used pre-cutting blade and the main cutting blade are the outer surface of the pipe cut at a radial length from the center of rotation. A pre-cutting blade A having a length obtained by adding a pre-cut depth to a distance between the rotating shaft of the slide mechanism and a distance between an outer surface of a pipe cut at the length and the rotating shaft; At least the pipe diameter It is necessary that the cutting upper blade B with the length.

Further, as shown in FIGS. 2A and 2B, when the preliminary cutting blade A and the main cutting upper blade B to be used have a half-moon shape, the two blades are a two-piece blade. Therefore, the positions of the two blades are arranged concentrically with the rotation axis of the slide mechanism and can be cut within the same circumference. Moreover, it is necessary to position the pipe to be cut at a position between the rotary shaft 3 of the slide mechanism, the preliminary cutting blade, and the main cutting upper blade. In such a configuration, when precutting the pipe P, the rotating shaft 3 of the slide mechanism is positioned at the point X, and the preliminary cutting blade A is rotated together with the main cutting upper blade B by the rotation of the external servomotor M. The pipe P is rotated via the transmission belt 5 and a precut is performed to cut the outer surface of the pipe P located inside the preliminary cutting blade A. Then, the rotary shaft 3 of the slide mechanism is further rotated to the point Y. Then, the pipe P can be cut from almost the center by the main cutting upper blade B.

In the traveling type pipe cutting apparatus thus constructed, the single blade having the same rotation axis, that is, the pre-cutting blade A and the main cutting upper blade B, perform pre-cutting of the pipe and subsequent cut-off. When performing the pre-cut rotation center, immediately after the end of the pre-cut and before the start of the pre-cutting, the position of the rotary shaft 3 which is the rotation center of the pre-cut depends on the lengths of the preliminary cutting blade A and the main cutting upper blade B. Then, it can be moved on a trajectory that is linear, arc-shaped, or a combination thereof. This way,
The pre-cut and the subsequent cut-off of the pipe are performed by rotating the rotary single blade, rotating the rotary shaft 3 around the center thereof, and rotating on the slide mechanism 2 linearly or along a circle or an arc located outside the single blade. Can be done.

FIG. 3 shows an example of a traveling pipe cutting apparatus for cutting a pipe using an eccentric gear as another embodiment of the present invention. FIG. 3 also shows a traveling pipe cutting device that performs pre-cutting and cut-off press cutting of a pipe while synchronizing and running with the pipe forming speed, and separates a gear-type pipe cutting mechanism 7 from a pipe fixed to a pipe cutting blade. The gear-type pipe cutting mechanism 7 is provided with a pre-cutting blade A for making a pre-cut and a main cutting blade B for cutting off and press-cutting has a single rotation center, and a horseshoe-shaped integral blade structure concentric with the rotation center. Has made. This preliminary cutting blade A
And the gear-type pipe cutting mechanism 7 having the main cutting blade B
Is a structure in which a pipe cutting gear 8 meshing with a driving rotary gear 8 rotationally driven by a servo motor M is driven to rotate, and the preliminary cutting blade A and a main cutting blade B for cut-off press cutting are integrated with the pipe cutting gear 8. Because
By the rotation of the pipe cutting gear 8, these cutting blades A and B also rotate.

On the other hand, an outer peripheral gear 10 having an eccentric shaft 9 and an outer peripheral gear 12 also having an eccentric shaft 11 are engaged with the outer periphery of the pipe cutting gear 8. The pipe cutting gear 8 is provided with the two outer gears 1.
The rotating shaft, which is the center of rotation of the pre-cutting blade for pre-cutting according to the degree of eccentricity of 1 and 12 and the upper cutting blade for cutting off and press-cutting, slides on a straight line, an arc shape or a locus combining them to an arbitrary position. Be able to move. That is, when precutting the pipe P, the pre-cutting blade A is brought into contact with the outer peripheral position of the pipe to precut, so that the eccentricity of the outer peripheral gear 10 is minimized, and the eccentricity of the other outer gear 10 is maximized. Preliminary cutting blade A driven by rotation
Can be used to perform pre-cut. Similarly, when the main cutting of the pipe P is performed, the eccentricity of the outer peripheral gear 10 is maximized, and the eccentricity of the other outer peripheral gear 10 is further increased in order to move the main cutting blade B to the pipe center position and perform the main cutting. The main cutting can be performed by the main cutting blade B while being rotated and driven to the minimum.

[0014]

As described above, the traveling type pipe cutting device according to the present invention does not require a separate mechanism for cutting off the preliminary cutting of the pipe as in the prior art, but uses the same rotary cutting mechanism. Preliminary cutting and parting-off cutting can be performed at once, and the cross-section of the pipe is smoother than or equal to that of conventional equipment, and a pipe section with a dimple-free cutting surface can be obtained. In addition, the equipment cost is greatly reduced, the cutting efficiency is extremely high, and an economical traveling pipe cutting device can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a traveling pipe cutting device according to the present invention.

FIGS. 2A and 2B show another example of the traveling pipe cutting device according to the present invention, in which a is a diagram showing a precut state, and b is a diagram showing a main cutting state.

FIG. 3 is a schematic side view of still another embodiment of the traveling pipe cutting device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pipe lower blade 2 ... Slide mechanism 3 ... Rotary shaft 4 ... Pipe cutting mechanism 5 ... Transmission belt 7 ... Gear type pipe cutting mechanism 8 ... Pipe cutting gear 9, 11 ... Eccentric shaft 10, 12 ... Outer peripheral gear A ... Preliminary cutting Blade B: Full cutting upper blade P: Pipe M: Servo motor

Claims (3)

[Claims] 1. A traveling pipe cutting apparatus which synchronizes with a pipe forming speed of a pipe, precuts the pipe while running, and then cuts off the pipe, and separates the pipe from a pipe fixed to a pipe cutting lower blade. A cutting mechanism is provided, and the pipe cutting mechanism has a pre-cutting blade for making a preliminary cut and a parting press. The main cutting blade for cutting has an integral blade structure having one rotation center, and the pre-cutting blade and the parting press for pre-cutting. The rotating shaft, which is the center of rotation of the main cutting upper blade to be cut, is constituted by a slide mechanism that can slide and move on a trajectory that is linear, arcuate or a combination thereof, and the tip of the main cutting upper blade before cutting the pipe The upper part of the pipe into which the pipe first enters is preliminarily cut from the pipe surface by the rotation of the pre-cutting blade and precut, and then the same section to which the pre-cutting blade belongs. Traveling pipe cutting for non-deformable cutting, characterized in that the main cutting in another part of the single blade is rotated so that the rotation center of the upper blade is changed, and the pipe set on the lower blade is cut off partly. apparatus. 2. The pipe to be cut is positioned outside the pre-cutting blade, and the pre-cutting blade and the main cutting upper blade form an S-shape in which a rotation axis is located at a central portion in its shape. Further, a pre-cutting blade having a length obtained by adding a pre-cut depth to a distance between an outer surface of a pipe cut at a length in a radial direction from the rotation center and a rotary shaft on the slide mechanism. Further, the main cutting upper blade having a length obtained by adding at least the pipe diameter to the distance between the outer surface of the pipe to be cut at the length and the rotation axis of the slide mechanism, the cutting edge and the blade at the time of pre-cut The traveling pipe cutting device for undeformed cutting according to claim 1, wherein the pipe to be cut is positioned on an extension of the rotation center. 3. The pipe to be cut is positioned between the rotating shaft, the preliminary cutting blade and the main cutting upper blade, and the preliminary cutting blade and the main cutting upper blade are each provided with a rotating shaft at the center in its shape. Is a half-moon shape, and the length obtained by adding the precut depth to the distance between the outer surface of the pipe cut at the radial length from the rotation center and the rotation axis of the slide mechanism. A main cutting upper blade having a length obtained by adding at least a pipe diameter to a distance between an outer surface of a pipe to be cut at the length thereof and a rotation axis of the slide mechanism. 2. The traveling pipe cutting device for non-deformable cutting according to claim 1, wherein a pipe to be cut is positioned on an extension of a blade edge and a rotation center of the blade during pre-cutting.