JPH04135116A - Pipe cutting method and device thereof - Google Patents

Abstract

PURPOSE:To contrive shortening of cutting time of a milling cutter system and simplification of a device by separately cutting respective 1/4 peripheral surfaces on upper/lower sides of a pipe and 1/4 peripheral surfaces on right/left sides of the pipe, and cutting off the pipe. CONSTITUTION:A steel pipe 5 is fed to the first running cutter l, and when a cutting command is output, a pinion 11 is rotated to run a carriage 10 synchronized with a steel pipe feed speed through a rack 12. Then, a traversing motor 29 is simultaneously driven, and cutters 16, 17 are rotated by a hydraulic motor 21. Here in partial cutting, after the pipe 5 is bitten by cutters A, B, the cutters are traversed as in an arrow mark along the peripheral surface to cut 1/14 peripheral surfaces 31, 32 and 35, 36 in upper and lower sides in a round pipe 5-1 and a squared pipe 5-2. The steel pipe 5 is fed to the second running cutter 2, a position of upper and lower cut parts of the round pipe 5-1 and squared pipe 5-2 is detected by a detecting device, cutters C, D, provided in right/left sides of the steel pipe 5, are lifted along the peripheral surface matched with the cut position to cut 1/14 peripheral surfaces 33, 34 and 37, 38, and cutting of the pipe 5 is finished.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in a method for cutting a pipe into a predetermined length in a pipe manufacturing line and a cutting device therefor.

BACKGROUND OF THE INVENTION Pipe produced in a conventional pipe production line is cut to a predetermined size while running.

Conventional cutting methods include methods using a disc cutter, milling cutter, metal saw press, plasma, and the like.

In recent years, as electric resistance welded steel pipes have become larger, problems with cutting methods on their production lines have become more serious. In particular, when manufacturing both round tubes and square tubes, the number of cuts made using tools other than metal saws is small, and even if a cutting process is provided, production capacity is limited. Also, in the case of a metal saw,
If the wall thickness of the pipe is 5 mm or more, noise and burrs will occur, which will cause problems. In particular, the noise level becomes unbearable in the working environment.

Among these, cutting machines using milling cutters are of the type in which two to four milling cutters are installed on one traveling carriage and revolve around the pipe to be cut while rotating on its own axis (for example, JP 69212, Japanese Patent Publication No. 62-27926, Japanese Patent Application Laid-Open No. 62-74525, etc.).

The cutting of the tube by this cutting machine is carried out in the manner shown in FIG. In other words, in the case of a round tube, as shown in figure (a),
When a cutting command is issued to rotate the centers F and G of the lever, which rotates around the center ○, and the cutters H and I attached to the tip, the lever is swung, and the cutter tip first bites into the pipe, and the cutter tip is inserted into the pipe and its position is set. While holding H'I', turn the center of the lever in the direction of the arrow to cut. In addition, in the case of a square tube, as shown in figure (b), cut the cutters H and I into the tube, hold their positions H' and ■', and move them horizontally and vertically as shown by the arrows. Cutting is performed by adjusting the cutting in a straight line.

Problems to be Solved by the Invention As described above, cutting a pipe using a conventional milling cutter takes a long time because the entire circumference of the pipe is cut by a plurality of milling cutters provided on one traveling carriage. Furthermore, the traveling distance of the truck becomes longer, and the device becomes larger.

In view of the current situation, the present invention provides a pipe cutting method and a cutting device thereof, which are capable of shortening the cutting time and simplifying the apparatus using a single milling cutter.

Means for Solving the Problems In order to achieve the above object, the pipe cutting method of the present invention includes:
In this method, a manufactured pipe is cut into a predetermined length by a traveling cutter while being fed out continuously at a constant speed. 1/4 of the outer circumferential surface is cut by one traveling cutter, and 1/4 of the outer circumferential surface on each of the left and right sides of the tube is cut by another traveling cutter, and the partial cutting is repeated to cut the tube.

The traveling pipe cutting device of the present invention comprises a traveling cutting machine in which milling cutters are vertically opposed to each other with a pipe to be cut in between, and are provided so as to be movable laterally at right angles to the pipe axis along the outer shape of the pipe; A traveling cutting machine, in which milling cutters facing left and right on both sides of the pipe are movable vertically at right angles to the pipe axis along the pipe outer shape, is arranged in series on the pipe transfer line.

As shown in Fig. 4, the cutting operation of the round pipe (5-1,) is carried out by the first traveling cutter installed in the pipe transfer line, for example (
a) As shown in the figure, cutter A installed on the upper side of the tube and cutter B installed on the lower side of the tube bite into the tube and move sideways to separate the upper 1/4 outer circumference (31) and the lower 1/4 outer circumference. Face (32
) is partially cut. Subsequently, using the second traveling cutting machine, the cutters 〇 and D provided on the left and right sides are cut into the pipe on the same plane cut by cutters A and B, and moved in the joint direction to cut the left side 174 outer peripheral surface (33) and the right side 1/ 4. The tube is cut by partially cutting the outer peripheral surface (34).

The cutting operation for the square tube (5-2) is performed in the same manner as for the round tube, as shown in FIG. That is, the first traveling cutting machine cuts the cutter A as shown in FIG.
Cut the upper side (35) with cutter B, and cut the lower side (36) with cutter B.
(b)
As shown in the figure, the tube is cut by partially cutting the left side (37) with the cutter ○ and partially cutting the right side (38) with the cutter D.

In this way, the tube is cut by separately cutting the upper and lower 1/4 outer circumferential surfaces and the left and right 1/4 outer circumferential surfaces, so the partial cutting time performed by one traveling cutting machine is equivalent to cutting the entire circumference. The cutter mechanism can be simplified because the cutter is shorter than the case in which the cutting machine is cut, and the total cutting time using two cutters can be shortened compared to the case where the entire circumference is cut with one cutter.

Example Embodiments of this invention will be described based on the drawings.

FIG. 1 shows an apparatus for carrying out the cutting method according to the present invention on steel pipes, in which a first traveling cutting machine (1) and a second traveling cutting machine (Wr) are used in the transfer line after pipe manufacturing in the pipe manufacturing process. (2) are arranged in series.

In other words, the pipe is made with the forming roll (3), and the pipe is made with the straightening roll (3).
The steel pipe (5) straightened in step 4) is transferred to the first traveling cutting machine (1).
The upper and lower surfaces are partially cut using the 2nd traveling cutting machine (
2), the left and right sides were partially cut, and the cut steel pipe (5'
) is configured to be transported by the pinch roll (6) of the runout table and the catch roll (7).

The first traveling cutting machine (1) and the second traveling cutting machine (2) are
Place the trolley (10) on the rails laid on the base (9),
Connect the pinion (11) provided on the base (9) side to the trolley (10).
The pinion (11) is rotated by the motor, and the cart (10) is provided so that it can reciprocate along the line to the position (10') shown by the chain line. ) is equipped with a cutting device that performs partial cutting.

Details of the cutting device on the truck (10) of the first traveling cutting machine (1) are shown in FIGS. 2 and 3.

A through hole (13) is made in the vertical frame (20) of the truck (10) through which the steel pipe to be cut passes, and a two-split clamp device (14) is provided around the hole for gripping the steel pipe to be cut.

This clamp device (14) is provided so as to be movable forward and backward toward the center of the through hole by means of a cylinder (15).・The above through hole (13
) that can be moved freely between the upper and lower sides (16)
(17) is provided. This cutter (16) (17) is
Two rails (23) installed horizontally in parallel on the vertical frame (20)
A transverse base plate (18) is supported by the transverse base plate (18) and can be freely moved horizontally by rotation of the movable screw (24) by screwing a nut onto a movable screw (24) installed horizontally between the rails. A hydraulic motor ( 2
1).

The moving screw (24) is driven by a traversing motor (27) via a reducer (26), and the moving screw (25) is driven by a lifting motor (27) via a reducer (28).
29). In the figure (30) is a wheel.

Although the above description has been made regarding the cart of the first traveling cutting machine (1), the cart of the second traveling cutting machine (2) has cutters (16) and (17) in the cart of the first traveling cutting machine (1).
The orientation of the support stand (22) is changed by 90 degrees so that the cutter can move up and down vertically.

The steel pipe (5) sent out through the forming rolls (3) and straightening rolls (4) of the pipe making machine is sent to the first traveling cutting machine (1). Here, when a cutting command is issued from a control device (not shown), the pinion (11) rotates, and the truck (10) travels via the rack (12) in synchronization with the steel pipe feeding speed. At the same time, the traverse motor (29) is driven.
The cutters (16) and (17) are equipped with hydraulic motors (21
) rotates.

Partial cutting at this time is shown in Figure 4 (in case of round pipe (5-1)).
As shown in a), use cutter A (cutter (1) in Figure 2).
6)) and cutter B (corresponding to cutter (1) in Fig. 2).
7)) bites into the tube and then runs horizontally along the outer circumferential surface as shown by the arrows to form the upper and lower 1/4 outer circumferential surfaces (31
)(32) is cut.

In the case of a square tube (5-2), as shown in Fig. 5(a),
Cutters A and B operate in the same manner as above to partially cut the upper side (35) and lower side (36).

The steel pipe (5) whose upper and lower portions have been partially cut by the first traveling cutting machine (1) as described above is sent to the second traveling cutting machine (2).

In the case of a round pipe (5-1), the second traveling cutting machine (2) detects the positions of the upper and lower cutting parts using a detection device (not shown), and determines the cutting position. Cutters C and D provided on the left and right sides of the steel pipe are moved up and down along the outer circumferential surface of the pipe to cut 1/4 of the outer circumferential surface (33) (34),
Finish cutting the tube.

In the case of a square tube (5-2>), as shown in Figure 5(b),
The left side (37) and right side (38) are partially cut by the same operation as in case (5-1) of the round tube, and the cutting of the tube is completed.

Effects of the Invention This invention divides pipe cutting into partial cutting by the horizontal movement of the cutter and partial cutting by the vertical movement of the cutter using separate traveling cutting machines, which reduces cutting time and simplifies the mechanism of the traveling cutting machine. can.

[Brief explanation of drawings]

FIG. 1 is a partial explanatory diagram of a pipe manufacturing line showing the arrangement of traveling cutting machines for carrying out the method of the present invention, and FIG. 2 is a cutting device mounted on a cart of the first traveling cutting machine in FIG. 1. FIG. 3 is a side view taken along line E-E in FIG. Up and down 1 due to rampant movement of
Figure (b) shows partial cutting of the 1/4 outer peripheral surface on the left and right sides by raising and lowering the cutter. Figure 5 is an explanatory diagram of the operation when cutting a square pipe. Figure a) shows partial cutting of the upper and lower sides by moving the cutter horizontally, Figure (b) shows cutting of the left and right sides by raising and lowering the cutter, and Figure 6 is an explanatory diagram of the operation of the conventional method of cutting with a single traveling cutting machine. , Figure (a) shows cutting of a round tube, and Figure (b) shows cutting of a square tube. 1... First traveling cutting machine 3... Forming roll 5... Steel pipe 7... Roll 9... Base 11... Binion 13... Through hole 15... Cylinder 18 ...Transverse platform 20...Vertical frame 22...Support stand 24, 25...Movement screw 27, Traverse motor 30...Wheel 2...Second traveling cutting machine 4...Correcting roll 6...Pinch roll 8...Support roller 10...Dolly 12...Rack 14...Clamp device 16.17...Cutter 19...Elevating platform 21...Hydraulic motor - 23...Rail 26.28...Reducer 29...Elevating motor Fig. 4 (a) (b) Fig. 5 (b) Fig. 2 Fig. 3

Claims (1)

[Claims] 1. A method in which a manufactured pipe is cut into a predetermined length by a traveling cutting machine while continuously feeding the pipe at a constant speed. A method for cutting a tube, characterized in that the tube is cut by separately cutting 1/4 of each outer circumferential surface and 1/4 of each left and right outer circumferential surface. 2. A traveling cutting machine in which milling cutters facing vertically across the tube to be cut are movable horizontally at right angles to the tube axis along the outer shape of the tube, and a milling cutter facing left and right across the tube to be cut. A pipe cutting device in which a traveling cutting machine, in which a cutter is movable vertically at right angles to the pipe axis along the outer shape of the pipe, is arranged in series on the pipe transfer line.