JPH0217288B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention particularly relates to a method and apparatus for cutting a welded bulge portion of a thin-walled electric resistance welded pipe made of aluminum.
The purpose is to improve cutting accuracy and lengthen cutting distance.

(Prior art) Conventionally, the welded bulge of an ERW pipe has been removed by cutting with a cutting blade. I'm letting you touch me.

(Problems to be Solved by the Invention) The conventional method has an electric resistance welding speed of 3 m to 60 m.
There is no problem in the range of about m/min.
However, if the ERW welding speed exceeds 80 m/min on a production line for thin-walled ERW pipes made of aluminum or aluminum alloy (approximately 0.7 mm thick or less), a problem may occur in which the sharpness of the cutting blade deteriorates. It was often hot. This deterioration in sharpness is thought to be caused by the formation of a so-called strong built-up edge at the tip of the cutting blade that is in contact with the weld. If the sharpness of the cutting blade deteriorates, the raised part of the weld may be removed and cut more than necessary, or the raised part may not be completely removed and a portion may remain, resulting in poor cutting accuracy. Getting worse. However, when an ERW pipe is roll-formed into a flat pipe or a small-diameter pipe, the portions with poor cutting accuracy are deformed more than or less than necessary, making it impossible to form a pipe with a specified cross-sectional shape. In the end, this led to the production of defective products.

On the other hand, to recover from the deterioration of sharpness, it is enough to replace the cutting blade, but replacing the cutting blade requires stopping the ERW tube manufacturing line, which not only reduces manufacturing efficiency but also The welding conditions also changed and the yield deteriorated, which was undesirable.

(Means for Solving the Problems) However, in the present invention, a cutting blade for cutting the welded portion is movable in a direction perpendicular to the traveling direction of the ERW pipe, and the cutting blade has a structured cutting edge formed at the tip. The cutting edge is moved at intervals of enough time for the cutting edge to start deteriorating, which avoids the deterioration of the cutting blade's sharpness and improves the degree of cutting of the welded part. This improved efficiency and yield, and solved all of the above problems.

(Example) Hereinafter, an example in which the present invention is applied to an electric resistance welded pipe made of aluminum will be described.

As shown in FIG. 1, the aluminum electric resistance welded tube 1 is made into a tubular shape by gradually bringing both side edges of an aluminum sheet 3 unwound from an aluminum coil 2 close to each other, and a high frequency coil 4 loosely fitted into this material. It is manufactured by heating the material through a roller and welding the both side edges using a squeeze roll 5. However, the welded parts 6 on both side edges have raised parts 6 inside and outside of the electric resistance welded pipe 1.
a, 6a (see FIG. 2) are formed, and the outer raised portion 6a is removed by cutting with a cutting blade 7. The cutting blade 7 faces in the running direction of the aluminum resistance welded tube 1 to the extent that it can cut the outer raised portion 6a.

When a flat cutting tool 8 having a straight edge is used as the cutting blade 7, a supporting device for the flat cutting tool 8 is constructed as shown in FIGS. 2 and 3. That is, a protrusion 11 having a screw hole 10 is provided on the upper part of the chuck 9 that holds the flat cutting tool 8, and the protrusion 1
The chuck 9 is screwed into the screw hole 10 of the aluminum ERW pipe 1 in a direction perpendicular to the traveling direction of the aluminum ERW pipe 1 to a screw rod 13 which is rotatably installed via bearings 12, 12.
Configure the drive device. The flat cutting tool 8 is made of, for example, tungsten-based high-speed steel (SKH-9) and has a blade width of about 10 mm.

In the above embodiment, one end 13a of the screw rod 13
Connect a handle or rotational drive device to the screw rod 13
When rotated in the direction of arrow 14, the flat cutting tool 8
can be moved via chuck 9 in the direction of arrow 15, that is, in the blade width direction. Therefore, when manufacturing the aluminum electric resistance welded pipe 1, at the start of manufacturing, the flat cutting tool 8 is set so that one end of the blade part 8a is in contact with the raised part 6a, and the blade part 8a is The flat cutting tool 8 is moved in a direction perpendicular to the running direction of the electric resistance welded pipe 1 by rotation of the screw rod 13 at intervals of a period of time when a built-up cutting edge is formed and the sharpness begins to deteriorate, and the blade comes into contact with the raised portion 6a. The portion 8a is changed and gradually moved toward the other end.
By doing the above, the phenomenon in which the sharpness of the cutting blade deteriorates due to the formation of a built-up edge can be avoided, so the sharpness can be maintained in a good condition and the welded part can be cut with high precision. can.

Outer diameter 12.7 from aluminum sheet with heat 0.6mm
An example in which an aluminum resistance welded tube of mmφ was manufactured was as follows. The aluminum coil 2 normally weighs about 150 kg, but the built-up cutting edge is formed over approximately 2000 to 3000 m, which is approximately 150 kg in weight.
This was when production of about 100 kg was in progress. Therefore, when the flat cutting tool 8 in the above embodiment was moved by about 1.5 mm for every 100 kg of production, the length of the aluminum coil was 700 kg, and the length of the electric resistance welded tube was 14,000 ~
During the production of 21,000m, it was possible to cut without deteriorating the sharpness.

FIGS. 4 and 5 show other embodiments of the invention. That is, the annular cutting tool 16 is loosely fitted on the outside of the electric resistance welded pipe 1 made of aluminum, and the annular cutting tool 16 is
A part of the annular blade portion 16a formed on the inner edge of the welding portion 6a is brought into contact with the welding bulge portion 6a. Said circular cutting tool 1
6 is fixed to a chuck 18 that is rotatably supported by a bearing 17 that is loosely fitted on the outside of the electric resistance welded tube 1. A cylindrical portion 1 is provided on one side of the chuck 18.
9 is formed, and a worm gear 21 is meshed with teeth 20 provided on the outer wall of the cylindrical portion 19.
A drive for the chuck 18 is provided. In the above, when the worm gear 21 is rotated in the direction of the arrow 22 (manually or automatically), the annular cutting tool 16 is rotated along its circumferential direction.

In the above embodiment as well, when manufacturing an aluminum electric resistance welded tube, a built-up cutting edge is formed on the blade portion 16a and the sharpness begins to deteriorate.
By rotating the annular cutting tool 16 via the worm gear 21, the part that contacts the welding bulge 6a can be changed, and a large amount of electric resistance welded pipe can be cut without deteriorating the sharpness.

When the inner diameter of the annular cutting tool 16 is set to 50 mmφ, the blade portion 16a is approximately 150 mm in terms of width, so the blade width can be made 15 times that of the above example, and as a result, an aluminum coil of 10,500 kg can be manufactured. In the middle, there is no need to replace the cutting blade.

(Effects of the Invention) As described above, according to the present invention, the cutting blade in contact with the welded part is moved at intervals of enough time to form a built-up edge on the cutting blade and the sharpness begins to deteriorate, thereby changing the contact part. This has the effect of maintaining good sharpness of the cutting blade and improving cutting accuracy. Further, as mentioned above, in order to change the contact portion of the cutting blade, the cutting blade is supported movably in a direction perpendicular to the running direction of the ERW pipe, and a drive is provided to move the cutting blade in a direction perpendicular to the running direction of the ERW pipe. The provision of the device has the effect of increasing the distance that can be cut by one cutting blade, making it possible to weld over a long distance under the same conditions, and improving manufacturing efficiency and yield. When the cutting blade is configured with an annular cutting tool, the effective width of the cutting edge is increased compared to the case of a flat cutting tool, which has the effect of significantly increasing the amount of processing.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the electric resistance welded pipe manufacturing line that is the object of this invention, Fig. 2 is a side view of the apparatus for implementing the invention, Fig. 3 is an enlarged front view of the cutting part of the apparatus for implementing the invention, and Fig. 4 5 is a longitudinal sectional front view of another implementation device of the present invention, and FIG. 5 is a side view of another implementation device. DESCRIPTION OF SYMBOLS 1... ERW tube, 2... Aluminum coil, 3... Aluminum sheet, 4... High frequency coil, 5... Squeeze roll, 6... Welded part, 6a... Swelled part, 7...
Cutting blade, 8...Flat type cutting tool, 8a...Blade portion, 9...Chuck, 10...Threaded hole, 11...Protrusion, 12...Bearing, 1
3... Screw rod, 14, 15... Arrow, 16... Annular bite, 16a... Blade portion, 17... Bearing, 18... Chack, 19... Cylindrical portion, 20... Teeth, 21... Worm gear, 22... Arrow.

Claims (1)

[Claims] 1. A method for cutting the outside of a welded portion of a thin-walled electric resistance welded pipe, in which a cutting blade is brought into contact with the welded portion of a traveling electric resistance welded pipe, and a built-up cutting edge is formed at the tip of the cutting blade. A method for cutting a welded part of a thin-walled electric resistance welded pipe, characterized in that the cutting blade is moved at intervals such that its sharpness begins to deteriorate to change the part that comes into contact with the welded part. 2. A cutting blade is brought into contact with the welded part of the running electric resistance welded pipe, and the cutting blade is moved at intervals such that a built-up edge is formed at the tip of the cutting blade and the sharpness begins to deteriorate. In a device that performs a method for cutting a welded part of a thin-walled electric resistance welded pipe by changing the abutting part,
The tip of a cutting blade for cutting the weld is exposed to the welded part of the running electric resistance welded pipe, and the cutting blade is supported by a chuck that is movable in a direction perpendicular to the traveling direction of the electric resistance welded pipe. An apparatus for cutting a welded part of a thin-walled electric resistance welded pipe, characterized in that the chuck is connected to a drive device for moving the electric resistance welded pipe in a direction perpendicular to the traveling direction of the electric resistance welded pipe. 3. The device for cutting a welded portion of a thin-walled electric resistance welded pipe according to claim 2, wherein the cutting blade is a flat cutting tool having a predetermined width, and the chuck of the cutting tool is configured to be movable in the width direction of the cutting tool. 4. The cutting blade is a ring body loosely fitted into the running electric resistance welded pipe, and the chuck of the annular cutting blade is rotatably supported in the circumferential direction of the cutting blade. A device for cutting welded parts of thin-walled ERW pipes.