JPS6125468B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a method for welding objects to be welded by electron beam irradiation in a vacuum welding chamber. This invention relates to an electron beam welding method in which a welding chamber is formed by containing only a welding chamber in a sealed state, and the welding portion is welded in a vacuum inside the welding chamber.

<Prior art> As is well known, welded joints have been widely used for joining various structures due to their reliability and low cost. The beam welding method has been widely used in various fields because it has various advantages for precision welding parts and high melting point materials.

According to the electron beam welding method, there are various advantages such as small welding distortion and welding deformation, and deep penetration welding is possible. However, on the other hand, in order to use the welding method efficiently, It is desirable to perform welding in a vacuum, and it is known that high purity and high performance welding can be achieved by performing the welding in a vacuum.

However, welding in a vacuum naturally requires work inside a vacuum welding room, and a normal vacuum welding room has the disadvantage of having a limit to the size of objects that can be stored. If electron beam welding is to be applied to objects, the disadvantage is that it requires a large vacuum welding chamber, which increases costs.
Furthermore, the vacuum evacuation equipment has become larger, which not only increases the equipment cost, but also has the disadvantage that evacuation takes a long time and reduces work efficiency.

In particular, when the object to be welded is a long pipe with a small diameter, the welding room that houses the entire thing becomes large, even if the welding area is only a small part, which is extremely inefficient. However, vacuum electron beam welding was difficult to perform.

<Problems to be solved by the invention> Therefore, in order to deal with this problem, for example,
As disclosed in the invention disclosed in Japanese Patent No. 17153, a technology has been developed in which a long tube is sealed with an electron beam in a vacuum chamber, but the seal is complicated and difficult to seal against the tube, and the supporting technology has not been sufficiently developed. Not yet. There was a problem that it could not be put into practical use.

The purpose of the present invention is to solve the problems of the electron beam welding method for large welded objects, especially long welded objects, based on the above-mentioned prior art, and to seal only the parts of the welded object that need to be welded. By firmly supporting and partially forming a vacuum welding chamber to perform welding, the above drawbacks and difficulties are eliminated, and the disadvantages are eliminated and it is possible to weld long objects such as pipe materials. It is an object of the present invention to provide an excellent electron beam welding method that allows electron beam welding to be performed in a vacuum, thereby benefiting the field of application of welding technology in the construction industry.

<Means and operations for solving the problem> In accordance with the above-mentioned object, the structure of the present invention, which is summarized in the above-mentioned claims, is to insert a long object into an insertion hole of a rotary seal plate on a wall of a welding chamber, A support device installed on the rotary seal plate ensures a secure seal, then a flexible sealing material is used to seal between the rotary seal plate and the long object, and then the welding chamber is evacuated to seal the welded part. This was achieved by taking technical measures to

<Example> Next, an example of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 designates an electron beam welding device used to carry out the present invention, which includes a welding chamber 3 installed approximately in the center of a base 2, support mechanisms 4 provided on both sides of the welding chamber 3, It has 4.

The welding chamber 3 is a rectangular case, and holes 5, 5 are coaxially bored in substantially the center of the opposing sides 3', 3', and a flange is provided at the peripheral edge of the welding chamber 3. 6 is formed, and a groove 7 is carved in a circular shape from the circumferential surface of the hole 5 on the inner side thereof.

Further, 8 is a rotary seal plate, which is loosely installed in the groove 7 via a predetermined number of ball bearings 9, and prevents communication between the outside air and the inside of the welding chamber 3 via a seal member 10 as appropriate. It is sealed.

Reference numerals 11 and 12 designate pipe materials as long objects to be welded, and in order to perform butt welding with an electron beam in the welding chamber 3, the outer ends of each are connected to support mechanisms 4, 4 by chucks, etc. It is fixed rotatably as appropriate, and the welding end is inserted into the welding chamber 3 through an insertion hole 13 drilled in the center of the rotary plate 8 by a process described later and is butted against equipment. There is.

Further, 14 is a sealing material made of a suitably flexible material, and its both ends are suitably made of metal bands 15, 16.
The flange plate 17 provided at the periphery of the insertion hole 13 of the rotary plate 8 and the pipe materials 11, 12
The welding chamber 3 is fixed to the inside of the welding chamber 3 so that the outside air and the inside of the welding chamber 3 can be shut off.

Therefore, even if the cross-sections of the pipe materials 11 and 12 are not perfect circles, sealing performance is reliably guaranteed, and the sealing material 1 can also be brought into close contact with the rotary seal plate 8.
Since the load of the pipe materials 11 and 12 is not directly applied to the tube 4, the sealing performance can be maintained.

8 is a support body, and the tube materials 11, 1
It is used as a simple linkage mechanism when the pipe material 2 has a small diameter or is made of a lightweight material, and is loosely inserted from the rotary seal plate 8 into a plurality of pins 19 fixed and vertically installed in the welding chamber 3 to connect the pipe material 11. , 12, and is integrally fixed to the support body 18 in parallel and loosely inserted into the pin 19.
0 and the support body 18 is biased in the direction of the tubes 11 and 12 through the spring 21 inserted therein.
12 tubes 11 and 12 are supported.

In this way, the tubes 11 and 12 are supported by the rotary seal plate 8, and since the rotary seal plate 8 can be made perfectly round and have a smooth surface in advance, sealing can be performed reliably.

On the other hand, if the tube materials 11 and 12 are directly supported in the vacuum chamber 3, the surface of the tube materials may be dented or scratched.
If it is not a perfect circle, a seal failure will occur during rotation.

Reference numeral 22 denotes an electron beam welding mechanism, which is attached to the upper surface of the welding chamber 3 via a mounting mechanism 23 so as to be slidable in the direction of the arrow.
It is possible to irradiate the abutting portions 1 and 12 with an electron beam.

Further, an exhaust pipe 24 is attached to one side 3' of the welding chamber 3, and the inside of the welding chamber 3 can be brought into a vacuum state via a pump 25 connected to this.

Further, 26 is an observation window provided on the other side surface.

In the above apparatus, first, the pipe materials 11 and 12 as objects to be welded are connected to the support 18, pin 19,
Then, it is set in a predetermined position in the welding chamber 3 and in the support mechanisms 4, 4 via a linkage mechanism consisting of a spring 21, and only the butt welded portions of both the tube materials 11, 12 are sealed tightly.

In the above-mentioned setting, a backing material 27 is uniformly attached to the inner surface of the abutting portion via a bonding material 28 such as plastic gum.

Next, the pump 25 is operated to make the inside of the welding chamber 3 a vacuum, and the electron beam welding mechanism 22 is operated by an appropriate control device (not shown).
Welding is performed by irradiating an electron beam onto the butt portion of the two.

Therefore, when welding, the electron beam welding mechanism 2
2 is movable via the mounting mechanism 23, the irradiation position can be adjusted, and the tube members 11 and 12 themselves can be rotated by appropriate means, or the rotary seal plate 8 can be rotated. The pipe members 11 and 12 are rotated to perform welding uniformly around the welded portion.

In addition, if the pipe materials 11 and 12 as objects to be welded have a large diameter or are made of heavy material,
The rotational linkage mechanism between the workpiece to be welded and the rotary seal plate 8 is required to be robust, and FIGS. 7 and 8 show the linkage mechanism in this case.

That is, as a linkage mechanism, the base of a dogleg-shaped arm 30 having a screw hole 29 at the tip is pivotally supported on a bracket 28 which is provided protruding from the side surface of the welding chamber of the rotary seal plate 8, as shown in the figure. .

When setting the pipe material 11, the connecting joint 31 is welded and fixed to its peripheral surface in advance, and then inserted into the welding chamber 3 through the insertion hole 13 of the rotary seal plate 8, and the connecting joint 31 is drilled. The distal end of the arm 30 is inserted into the provided rectangular hole 32 and the locking bolt 33 is threaded to connect the pipe member 11 and the rotary seal plate 8. You can definitely do it.

In addition, since the arm 30 is designed to fit into the rectangular hole 32 with a slight clearance, dimensional changes of the tube material 11 and connection joint 3
The installation dimensional error of 1 can be absorbed, and the pipe material 1
1, the arm 30 is rotatable in the direction of the arrow, so it does not become an obstacle.

The embodiment shown in FIG. 10 shows another aspect, in which the welding chamber 3 is installed in a down position on a base 34 via a support 35, and the welding materials 11, 12 are
is rotatably supported on a rotary table 36, and the tube material 1 is rotatably supported on a rotary table 36.
It is possible to weld while applying a predetermined rotation to 1 and 12.

Note that the embodiments of the present invention are not limited to the above-mentioned embodiments, and can be applied not only when the material to be welded is a pipe material but also to various types of shaped materials depending on the design aspect of the sealing material 14. Of course, the linkage mechanism between the workpiece and the rotary seal plate may also be in other forms.

<Effects of the Invention> As described above, according to the present invention, since electron beam welding can be performed on a long workpiece in a vacuum, welding on high melting point materials and deep penetration welding are also possible. This method has the advantage that high-purity welding can be performed accurately, and precision welding can be performed even on large structures.

In addition, since electron beam welding is performed by sealing only the part of the long object to be welded and forming a partial vacuum welding chamber, there is no need for a large vacuum chamber. Not only can the cost be reduced, but the vacuum welding chamber only needs to be large enough to cover only the part to be welded, and therefore its volume is small, and the exhaust device when transitioning to a vacuum state can also be small. Moreover, it has the effect of shortening the time required for evacuation, and can be applied to various structures.

By supporting the workpiece on the rotating seal plate, compared to directly supporting the workpiece in a vacuum, even if the workpiece is dented or scratched, the sealing performance is sufficient during rotation. The effect is that it can be maintained at

Furthermore, by sealing the object to be welded and the rotary seal plate with a flexible sealing material, sealing performance can be ensured even if the cross-sectional shape of the object to be welded is somewhat uneven. An excellent effect is achieved in that no load is directly applied and rotation can be performed smoothly.

[Brief explanation of the drawing]

The drawings show embodiments of the invention, and FIG. 1 is an external view of the device used to carry out the invention;
Figure 2a is a perspective view showing the joined state of the objects to be welded, Figure 2b is a longitudinal sectional view of the same, Figure 3 is a partial sectional view of Figure 1, Figure 4 is a partially enlarged view of Figure 3, and Figure 5 6 is a partial cross-sectional view showing the welded object support mechanism, FIG. 7 is a partial sectional view of the connection between the welded object and the rotary seal plate, and FIGS. 8 and 9 are A partially enlarged perspective view thereof, and FIG. 10 is an overall side view of another embodiment. 11, 12... Work to be welded, 3... Welding room, 8...
...Rotary seal plate, 13...Insertion hole.

Claims (1)

[Claims] 1 When electron beam welding is performed on a long workpiece having a rotating shaft in a vacuum welding chamber, only the welded portion of the workpiece is is stored in the welding chamber, the rotary seal plate and the object to be welded are linked in the welding chamber, and after sealing the gap between the two, the welding chamber is evacuated, and the object to be welded is rotated. In an electron beam welding method in which the welding part is welded while rotating together with the seal plate, the work to be welded is inserted into the insertion hole, the work to be welded is supported by the rotary seal plate, and then the work to be welded is An electron beam welding method characterized in that an object and a rotating seal plate are sealed using a flexible sealing material.