JPS6044178A - Method and device for forming groove in butt welding - Google Patents

Abstract

PURPOSE:To improve both accuracy and working effciency by back-chipping a base material which is subjected to front welding by means of an end mill blade or the like to form a back groove of a single U shape. CONSTITUTION:A sheet of a steel plate subjected to blank layout to a prescribed size is formed to a tubular shape and the inside of a single Vee groove 2 for front welding is subjected to multi-layer build-up welding to complete front welding 4. The material 1 subjected to the front welding is rotated half and is cut with an end mill blade or side cutter blade to form a single U groove 6 for back welding. The groove 6 is so cut as to arrive at the bottom of the front welding from a root face 3. The inside of such groove 6 is subjected to back welding 7 by multi-layer build-up welding. The use of arc air gouging and grinding is eliminated by such method and both accuracy and working efficiency are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is used, for example, when welding high-strength steel pipes by submerged arc welding, and greatly reduces noise and dust generated during the manufacturing process compared to conventional methods, improving work efficiency. This invention relates to a method and apparatus for forming a groove in butt welding that improves accuracy and enables highly efficient welding.

If you line up, it will be 9 to 1001111. Inner diameter 400~15
20 tm high-strength steel pipes are generally made by forming a V-shaped groove with a depth of about 60% of the thickness in the base material cut into a predetermined size from a raw material plate, and forming a V-shaped groove with a depth of about 60% of the thickness. After bending it into a tube shape so that the ll+ -) faces are in close contact with each other, and temporarily welding the close contact part from the front side of the tube,
Pipe (base metal) after multi-layer welding inside the V-shaped groove above, and then surface welding (inside welding in welding f)
4. Drilling is performed to form a groove for actual welding (welding from the front side of the pipe). This yi hatsuri is about 5cm thick
At around 0φ, perform it to the extent that the surface weld layer is slightly removed,
Conventionally, arc air gouging has been combined with Jirai J4-gearing. Therefore, when gouging, strong light, high-frequency sound, and high heat are emitted into the surrounding area, and when installing silinter, 1. The working environment was extremely harsh, with the scratching sound and the magnetic iron powder rusting on the surface, forcing the workers and the creators to endure harsh labor. .

However, arc/one-door/gouging uses a large flow to melt the base material and blows out the melted part with powerful air to rapidly cool it, so it is necessary to take measures against heat effects such as quenching the chipped part and changing its structure. .

And Shirainter (Sashitar) θ! This is done to finish the molten surface on the other side cleanly and to cut the heat-affected part, but since it is grinding the hardened surface, the gravity is 14 Il, and the finishing accuracy is It cannot be issued automatically and requires skill. Furthermore, if the heat-affected portion is not sufficiently cut, hair cracks may remain. For this reason, it is currently possible to apply arc air gouging to the back chisel.
Limited to high tensile steel up to 60Y%f, sand, 80φ'
- High tension shoulders and Or/M.

It is considered inappropriate to use this for groove formation in alloy steel.

In order to eliminate the disadvantages of the V-shaped urasaki mentioned above, the V
It is possible to form an X-shaped groove in which shaped grooves are previously provided on both the front and back surfaces of the base material, but the X-shaped groove is Jt.

-Toff/Ace becomes thinner and tends to burn through, and
Poor penetration may remain between the root faces. In addition, in the case of welding base metals with curved surfaces such as pipes, it is useful to detect whether or not the butted edges are welded on a predetermined arc without any irregularities, and it is useful to ensure cleanliness. Low Fft (there are also drawbacks). In addition, if the tubes are butted together using the U and O method,
The treetop If can be same as above, but since the root face needs to be reversed, the temporary attachment part needs to be cut out before the main welding, and a large number of male and female types and combinations that match the pipe diameter are required. Although it is suitable for mass production of a small number of varieties, which requires separate molds, it becomes costly for the production of many varieties of small blues, and it is not suitable for pigeon coops that produce small amounts of one tube.

Also, T, ■, 1. Let's weld! However, due to the slow welding speed and low efficiency, there is a limit to the depth of the groove that can be formed.
The drawback of J is that it cannot be welded.

It should be noted that the back of butt welding has traditionally been done using a chisel or Shiharu 4, but these conventional mechanical cutting methods can handle flat chisels by using pads, etc., but compared to However, in the case of long C4-walled Shima Tensurikukan, the rigidity was insufficient and it could not withstand the cutting process.
There are some points where accuracy cannot be obtained.

From the above, for the base metal 1i + l limit 4i r, a V-shaped groove is first formed, and after the front welding, gouging is performed, and the back welding is done on the base metal. U of
Currently, a groove forming method is used to form a shaped groove.

Therefore, in order to solve the problems of the conventional chiseling work described above, the present invention has been developed by using an end mill or side cutter to chisel the length of the base material after surface welding. The present invention provides a method for forming a groove in a butt weld, in which a KU-shaped groove is formed in the base material without performing a welding process. In addition, the second invention of Wood M is that a rotating shaft is provided on a sliding table that runs parallel to the lifting direction on the back side of the base material after surface welding, and the base material is cut into a U-shape on this rotating shaft. Take an end mill blade or side cutter blade to form the bevel.

The present invention provides a groove forming equipment for butt welding that can form a U-shaped groove without using a gouging blinder.

The embodiment shown in the drawings is one in which the present invention is used to weld high-strength steel pipes. The present invention will be described in detail below with reference to this embodiment.

Figure 41 shows a state in which a single plate cut to a predetermined size is formed into a tubular shape using, for example, the 4-piece machine of the applicant's earlier application filed in 1978, Patent Application Publication No. 5980. , (1
) is the base material, (2) is the V-shaped tip for surface welding, 131 is the root face, the V-shaped groove (2) has an angle of about 60°, and has a depth of about 60 degrees of the plate thickness. has. FIG. 2 shows the base metal (1) after surface welding 141 has been completed by multi-layer welding within the ■-shaped groove (2).

In the figure, (5) indicates that the root face (3) is temporarily fixed on a hard surface by welding. Figure 3 shows that the base metal (1) that has undergone front welding (4) is rotated half a turn, and the end mill blade 71c shown in Figure 15, which will be described later, is used with a sight saw blade to create a U-shaped tip for back welding. (6) is shown in the formed state. This U
The shaped groove (6) is cut from the supplementary root face (3) to the bottom of the surface weld (41) and has a depth of approximately 50 inches of the plate thickness. 6) Shows the state in which the inside is multi-layer welded and prefecture welding (7) is performed.

FIG. 5 is a schematic diagram illustrating an example of a basic method for forming a U-shaped groove for welding of welded steel pipes.

In the figure, as shown in tii2'V before (11
After completing step 1, the base material (8) is a pair of left and right @l that supports the base material (1) from one side and is capable of forward and reverse rotation 0T! 1J0-le, 19
) was laid parallel to the drive roll (8).
11 and runs parallel to the base material i11, the sliding table till can be seen from ・1afR of the base material (1) as shown by the left and right arrows in the figure. A support part consisting of a ram stand +1Ila (which fits onto the top surface of the sliding table 19) and a column 1111b standing perpendicular to it (13 is a column 1111b as shown by the left and right arrows in the figure). +l1lb is a lifting platform that can be raised and lowered and is fixed at a predetermined height (13 is a lifting platform 0 along with Tanabata 1141).
2, and as the sliding table (9) moves,
a rotating shaft that moves along the side surface of the base material (1) while rotating;
It is an end mill blade that is fixed to the front end of the n9 rotary shaft (11) and has a cylindrical cutting surface.In addition, when using a side force of 1 liter for the back of the base material (11), As shown by the moat, an elevating platform is attached to the column UB, which is fixed at a predetermined height with the elevating speed being R.
A side cutter blade 11R is installed at the side end, and the side cutter 8 is configured to cut 141'' in contact with the root face (3) of the base material il+ facing upward.

The rotating 4as with a 1υ domill blade (19 attached) on the front end
may be provided at right angles to the sleeve line of base material (1), but
With respect to the cutting edge advancing direction shown by the - arrow in the figure, it is tilted 4+ so that the coaxial base end side is located forward, and the cutting edge is tilted 4+, and the tip of this inclined rotation 4113) If you attach an end mill blade f19 whose surface is shaped like a circular shape centered around the rotation axis, it will have a U shape with a width equivalent to the rotation diameter of the nuclear force a9 and an arcuate surface at the bottom. Bevel (
6) can be cut, which is advantageous. Also, around this time, the previous time'
E 1111 +131 are provided at multiple locations in front and behind the lifting table TI3 along the left-hand cutting progress of the groove (6) as shown in FIG. +5, for example, Moezui's end mill 8Q
The cutting depth of the cap is set to 1 and 0, and the next end mill blade is 1151. The cutting depth of the blade 111ilJ at the rear end is set to approximately half of the groove depth, and the cutting depth of the blade 111ilJ at the rear end is adjusted to a predetermined U-shaped groove (
6), if the cutting amount is set differently so that the blades at the rear in the cutting direction sequentially increase chestnut ζ more than the blades at the front in the cutting progress direction, the cuts occurring in each month (19) 141J resistance is small,
Moreover, the difference in efficiency is significant, which is more advantageous than cutting with a single blade. In addition, as shown in Fig. 6, the base material (
In some cases, a profiling device (1g) that moves along with the rotary shaft (1m) while touching the cutting position of 11 is installed to automatically adjust the cutting depth of the end three blades 11 mark 4. As shown, the base material (11) may be moved relatively.

Furthermore, the present invention is not limited to welded pipes as shown in the examples.
Needless to say, the present invention can also be applied to groove formation for butt welding, where it is necessary to form a back groove after front welding on a flat surface or the like.

As described above, the present invention uses an end mill blade or a side cutter to hang the base material after front welding to form a U-shaped back groove, which conventionally requires heavy use. A new groove forming method in butt welding and its "placement" method eliminates the need for one person's work on the arc air/moon fitting line. It is an OTN version.

[Brief explanation of the drawing]

Figures 1 to 4 show a welded 514 pipe using the method of the present invention. Fig. 3 is a partially cutaway sectional view after welding, Fig. 3 is a partially cutaway sectional view after forming a groove according to the present invention, Fig. 44 is a cutaway IfT side view of the opening after back welding, and Fig. 5 is welding waste. Fig. 6 is an elevational view schematically showing the implementation row of the present invention position configured for pipes, and Fig. 6 shows another embodiment-1 of the rotary shaft and end mill blade attached to the device shown in Fig. 5, and its usage and duties. FIG. ■... Base metal % 2... V-shaped groove, 3... Root face, 4... Surface welding, 5... Temporary welding, 6... U-shaped tip,
7. Actual welding, 8. 1-41 effect roller, 9. Sliding table, 10. Rail, 11. Support section,] 1a.. Column stand, 11b.. Column, 12.. Elevating table. , 13...rotation axis, 14...7-ta, 15 (15,,151,153
)... Esido mill blade, 16... Lifting platform, 17... Rotation,
Tsumugi, 18... side cutter blade, 19... tracing device.

Claims (4)

[Claims] (1) A method for forming a groove in butt welding, which comprises forming a U-shaped groove in the base metal using an end mill or side cutter on the back side of the base metal after surface welding. (2) A rotating shaft is provided on a sliding table that runs parallel to the back side of the base material after surface welding, and a U-shaped groove is formed on this rotating shaft by cutting the base material. A device for forming a groove in butt welding, which is equipped with one cutting endonil blade or side cutter blade. (3) The rotary shaft is inclined so that its base end is located forward in the direction of cutting of the groove. [- A mill blade is attached to the rotary shaft. A device for forming the opening and tip in butt welding. (4) A sloping lol sleeve is provided at the IB & Kia locations along the cutting direction of the bevel -f11,
The endonyl blades attached to the tip of each rotating shaft each have a higher cutting power than the front blade. ! 4. The groove forming device for butt welding according to claim 3, characterized in that the groove forming device is provided with a step between each other so as to increase the resistance.