JPS62251009A - Cutting method for long-size metallic material and device thereof - Google Patents

Abstract

PURPOSE:To prevent burrs from occurring in a cutting part, by cutting a metallic material of a metal pipe or the like in a way of notching it from the opposite direction after being divided into two stages. CONSTITUTION:At that point that a metal pipe 1 of the specified length of an electric seam welded pipe or the like becomes situated in front of both first and second rotary saw blades 18 and 19, the table 4 stopped so far at the starting end of a guide rail 3 is started. Simultaneously with the table 4 moved in the same direction as the metal pipe 1 at the same speed, the metal pipe 1 is pressed down by a chuck 13. Then, the first rotary saw blade 18 is made contact with the emtal pipe 1, and a notch is put in the pipe as far as pipe thickness. Next, the second rotary saw blade 19 is made contact with the metal pipe 1 from the opposite direction to the said notch, thus cutting the pipe 1 is finished by continuation of vertical notches. Therefore, no burr is produced in a cutting part of the pipe 1.

Description

Detailed Description of the Invention 81 Object of the Invention (Industrial Application Field) The method and device for cutting long metal materials according to the present invention can be used to cut continuously manufactured long electric resistance welded pipes and drawn pipes. It can be used to cut metal pipes of a specified length.

(Prior art) Metal pipes used for various types of piping, etc., are of a fixed length, for example 3 meters, and are assembled or cut at a construction site. These fixed-length metal tubes are not made to this length from the beginning in a factory, but are made by cutting long metal tubes at predetermined intervals using metal tube manufacturing equipment. It is made of things.

That is, as shown in FIGS. 4 and 5, a guide rail 3 parallel to the metal tube 1 is provided below the metal tube 1 sent out from the continuous manufacturing apparatus 2 for the metal tube 1, and the guide rail 3 is parallel to the metal tube 1. A table 4 is provided which can freely move back and forth. This table 4 is driven by a reversible motor (not shown) via a chino or rack and pinion, and is moved in the same direction and at the same speed as the metal tube 1 until it reaches the end of the guide rail 3 (left end in FIG. 4). , it functions to move in the opposite direction and return to the starting end of the guide rail 3.

On the top surface of such a table 4, as shown in FIG. The rotary sawtooth 5 is fixed to one end of a rotating shaft 10 pivoted to the tip of the swinging arm 9, and a driven pulley 11 is fixed to the other end of the rotating shaft 10. A belt is passed between the drive shaft 7 and a drive pulley 12 fixed to the drive shaft 7, so that the rotation of the motor 6 is transmitted to the rotating sawtooth 5.

When cutting the metal tube 1 to a predetermined length, when the metal tube 1 of the predetermined length is present in front of the rotating sawtooth 5,
The table 4 had been stopped at the starting end of the guide rail 3 until then.
The table 4 is moved in the same direction and at the same speed as the metal tube 1. At the same time, the above table 4
A chuck 13 provided near the rotating sawtooth 5 on the upper surface of the metal tube 1 holds down the vicinity of the portion of the metal tube 1 to be cut.

Next, the air cylinder 14 provided between the top surface of the table 4 and the swinging arm 9 is retracted to lower the rotary sawtooth 5 supported at the tip of the swinging arm 9, and the rotary sawtooth 5 cuts the metal tube 1. cut.

After the cutting operation, the table 4 moves backward along the guide rail 3 to the starting end and prepares for the next cutting operation.

(Problems to be Solved by the Invention) However, when a metal tube is cut using the conventional cutting device constructed and operated as described above, the following disadvantages occur.

That is, as the cutting operation is performed by the rotary sawtooth 5, the edge of the cut portion of the metal tube 1 sags as shown in FIGS. 6 and 7, and a burr 15 is formed on this edge. The edge portion of the metal tube 1 cut by the rotary sawtooth 5 is finished by a chamfering machine, and this edge portion is provided with a burr 1 as described above.
If 5 exists, it will damage the cutting tool incorporated in the chamfering machine.

Cutting methods that do not produce burrs such as those shown in Figures 6 and 7 on the edge portion include cutting using a press or a rotary cutter, but in the case of cutting using a press, a depression called a dimple is formed in the cut portion. This is troublesome as it requires work to correct these dents later. In addition, in order to prevent the formation of the dimples mentioned above, there is a method of cutting out the part that will become the dimple in advance, but in both cases, including the case where it is corrected later, it is necessary to cut the precise mold to the diameter of the metal tube 1 to be cut. It has to be built at the same time, which increases equipment costs, maintenance costs, etc.

In addition, when cutting with a rotary disc cutter, burrs are formed all over the inner periphery of the opening of the metal tube, so not only does it require finishing, but the equipment itself is more expensive than a cutting device that uses rotary saw blades. It is inevitable that it will be precise and expensive.

Milling, which cuts the same circumferential portion of a metal tube little by little, eliminates the above-mentioned disadvantages, but the cutting speed decreases from half to half, so it is difficult to cut the same circumferential portion of the metal tube. The efficiency of manufacturing tubes will be reduced.

The method and apparatus for cutting a long metal material of the present invention eliminates all of the above-mentioned disadvantages.

b3 Structure of the invention (means for solving the problem) In the method and apparatus for cutting a long metal material of the present invention,
The method for cutting a metal material is characterized by cutting the metal material in two stages.

That is, as the first stage cutting process, the metal material is rotated around a first rotation axis parallel to the metal material continuously sent out from the manufacturing equipment that manufactures the long metal material, and the metal material is rotated at 6 kinetic speeds. A first cut is formed in a portion of the metal material by a first rotary saw blade that is movable at the same speed as the first cut.

After forming the first cut in this way, the first rotating saw blade used to form the first cut is allowed to escape from the metal material, and this first rotating saw blade is used for the next second step. Make sure that it does not interfere with the cutting process.

Once the escape of the first rotary sawteeth is completed, the first rotary saw blade is rotated about a second rotation axis that is parallel to the metal material and located on the opposite side of the first rotation axis with respect to the metal material. A second rotary saw tooth is rotatably driven on the same plane as the rotary saw tooth of the metal material and is movable at the same speed as the 6-movement speed of the metal material to form a second cut in the remaining portion of the metal material. Perform a two-stage cutting operation.

The second cut formed during this second stage cutting operation is made deep enough to be continuous with the first cut, and the metal material is cut by the continuity of both the first and second cuts. . The depth of the first cut formed in the first stage is shallower than the second cut formed in the second stage, and the process of forming the first cut takes a very short time. In order to finish cutting, both the first and second rotary saw teeth are brought close to the metal material from opposite sides at the same time, until the first rotary saw tooth that has formed the shallow first cut comes into contact with the second rotary saw tooth. It is also possible to escape before it approaches.

In addition, as shown in FIG. 1, the apparatus for cutting metal materials is a metal tube 1 or a metal material that is continuously fed out from a manufacturing device that manufactures long metal materials such as C-shaped or H-shaped cross sections. A table 4 is provided below the metal material and is movable in the same direction and at the same speed as the metal material.

At the portions of the table 4 that are opposite to each other with respect to the metal material, base end portions of first and second swing arms 20 and 21 are provided so as to be able to freely swing around the base end portions. It is supported as such.

At the tips of the first and second swinging arms 20.21, motors 6 are mounted parallel to the metal material and either the same or independent of each other.
supports first and second rotating shafts 16 and 17 which are rotationally driven via a belt or a chino.

A first rotating sawtooth 18 is provided at one end of the first rotating shaft 16 of both rotating shafts 16 and 17, a second rotating sawtooth 19 is provided at one end of the second rotating shaft 17, and both rotating saws are provided at one end. 18 and 19 are fixed so that they are located on the same plane.

Both the first and second rotary saw teeth 18 and 19 are selectively movable toward the metal material to be cut, such as the metal pipe 1, while one of the rotary saw teeth is cutting the metal material. The other rotary saw tooth escapes from the metal tube 1.

In this way, the first and second rotating saw teeth 18 and 19 are connected to the metal tube 1.
In order to selectively move toward
The expansion and contraction of the first air cylinder 22 for swinging the first swinging arm 20 that supports the fixed rotating shaft 16 at the tip of the second rotating sawtooth 19 supports the fixed rotating shaft 16 at the tip. The expansion and contraction of the second air cylinder 23 for swinging the second swing arm 21 supported on the section are performed in opposite phases to each other (when one air cylinder is extended, (The other air cylinder is contracted.) Or, as shown in FIG. 3, the first and second swing arms 20, 21 may be connected to each other.

A chuck 13 for holding down the metal tube 1 is provided near the base end pivot portions of both the first and second swing arms 2o and 21, as in the case of the conventional cutting device described above.

(Function) When cutting an electric resistance welded pipe or the like using the apparatus for cutting a long metal material of the present invention configured as described above, the cutting operation is performed as follows.

By feeding the ERW pipe etc. from the continuous manufacturing device 2 (FIG. 4) for ERW pipes, etc., a predetermined length of the ERW pipe is placed in front of the first and second rotary saw teeth 18 and 19 (to the left in FIG. 1). When the metal tube 1 comes to exist, the table 4, which had been stopped at the starting end of the guide rail 3, is started, and this table 4 is moved in the same direction and at the same speed as the metal tube 1. At the same time, the chuck 13 holds down the vicinity of the portion of the metal tube 1 to be cut.

Next, the first air cylinder 22 provided between the table 4 and the first swing arm 20 is retracted, and the first swing arm 2
A rotary sawtooth 18 fixed to the end of a rotating shaft 16 supported on the tip of the rotary shaft 16 is moved toward the metal tube 1, and the first rotary sawtooth 18 cuts the metal into the metal tube 1 as shown in FIG. tube 1
A first cut 24 having a depth approximately equal to the wall thickness is formed.

After forming the first cut 24 in this way, the first air cylinder 22 is extended, and the first rotary sawtooth 19 used to form the first cut 24 is inserted into the metal tube 1. The first swinging arm 20 is swung in the direction of escaping from.

First rotating sawtooth 1 as first air cylinder 22 expands
8 is completed, the second air cylinder 23, which had been in an extended state until then, is contracted to swing the second swinging arm 21, and the tip of the second swinging arm 21 is A second rotating sawtooth 19 fixed to the end of the rotating shaft 17 supported on the
is made eight times toward the metal tube 1 from the opposite side of the first notch 24, and a second notch is formed in the remaining portion of the metal tube 1 by the second rotary sawtooth 19.

This second cut is formed deep enough to be continuous with the first cut 24, and the metal material is cut by the continuity of both the first and second cuts.

After the cutting operation, the table 4 moves backward along the guide rail 3 to the starting end and prepares for the next cutting operation, as in the case of the conventional cutting device described above.

When a metal material such as the metal pipe 1 is cut in two stages from opposite directions in this manner, no large dents will be formed at the cut portion.

C1 Effects of the Invention The method and apparatus for cutting long metal materials of the present invention are configured and operate as described above, so that the cutting work of metal materials can be carried out efficiently without forming burrs on the edges of the cut portion. This makes it possible to provide high-quality, fixed-length metal materials at low cost.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical sectional view showing one embodiment of the apparatus for cutting long metal materials of the present invention, and FIG. 2 is a sectional view showing a first incision formed by the first stage cutting operation. , FIG. 3 is a diagram showing another example of the first and second swinging arms, FIG. 4 is a schematic side view showing a long tube manufacturing apparatus equipped with a conventional cutting device, and FIG. 5 is a diagram showing a conventional cutting device. FIG. 6 is a side view showing flaws generated in the cut portion by the conventional cutting device, and FIG. 7 is a sectional view of the same. 1: Metal tube, 2: Continuous manufacturing equipment, 3: Guide rail, 4:
Table, 5: Rotating sawtooth, 6: Motor, 7: Drive shaft, 8
: horizontal axis, 9: swing axis, 10: rotation axis, 11: driven pulley, 12: drive pulley, 13: chuck, 14: air cylinder, 15: burr, 16.17: rotation axis, 18: first Rotating sawtooth, 19: Second rotating sawtooth, 20: First swinging arm, 21: Second swinging arm, 22: First air cylinder, 2
3: Second air cylinder, 24: First cutting depth.

Claims (1)

[Claims] 1) Rotatably driven around a first rotating shaft parallel to the metal material continuously sent out from a manufacturing device that manufactures long metal materials, and at the same speed as the moving speed of the metal material. After forming a first cut in a portion of the metal material by a first movable rotary saw blade, the first rotary saw blade is caused to escape from the metal material, and then parallel to the metal material, the first cut is made in a portion of the metal material. The second rotary shaft located on the opposite side of the first rotary shaft is driven to rotate on the same plane as the first rotary saw blade, and is freely movable at the same speed as the moving speed of the metal material. forming a second cut in the remaining portion of the metal material by means of a second rotating saw blade;
A method for cutting a long metal material, in which the second cut and the first cut are made in succession to cut the metal material. 2) A table that is movable in the same direction and at the same speed as the metal material is installed below the metal material that is continuously sent out from the manufacturing equipment that manufactures long metal materials, and At the distal ends of both the first and second swinging arms, the base ends of which are swingably supported in oppositely located parts,
Each supports first and second rotating shafts that are parallel to the metal material and driven by a motor, the first rotating shaft has a first rotating saw blade, and the second rotating shaft has a second rotating saw blade. rotating sawtooth,
A device for cutting a long metal material, in which first and second rotating saw blades are fixedly positioned on the same plane and are selectively movable toward the metal material to be cut.