JPS5832038B2 - Kimitsuyousetsouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an airtight welding device for performing welding while maintaining a partial airtight state around a welding position.

In general, for electron beam welding or ion beam welding performed in a high vacuum, or arc welding performed in a low pressure atmosphere or special atmosphere such as argon gas or helium gas, at least the area around the welding position must be shielded from the atmosphere. There is a need.

Conventionally, as a device for performing this type of welding, a device is known in which the entire workpiece to be welded is housed in an airtight container and welded.
This device has the disadvantage that the entire welding device is large and requires a large space to install the device.

Therefore, an airtight container is placed on the surface of the object to be welded, and a sealing material such as an O-ring or backing is provided between the airtight container and the object to shield the inside of the airtight container from the atmosphere. A device has been proposed that performs welding while moving the workpiece relative to the workpiece.

However, with this device, the sealing material is rapidly worn out because the welding position and the joint after welding become extremely hot, and furthermore, if an excess portion is formed that protrudes from the surface of the workpiece after welding, The sealing material sliding on this extra portion was easily damaged.

Therefore, it is necessary to replace the sealing material with a new one as appropriate, and this replacement work is extremely complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide an airtight welding apparatus for welding objects made of non-magnetic materials without the risk of abrasion or damage to the sealing material.

In the present invention, a heat source generator for welding is installed in an airtight container that opens toward the workpiece, and the airtight container is placed on the surface of the workpiece, and the airtight container is placed on the back side of the workpiece. An airtight welding apparatus that includes shielding plates that face each other and performs welding by moving the object to be welded, the airtight container and the shielding plate relative to each other while synchronizing the airtight container and the shielding plate, A magnetic field line generating device having opposing magnetic poles that surrounds the outer end of the opening of the airtight container is provided away from the surface of the workpiece, and at least a portion of the shielding plate facing the magnetic field line generating device is made of a magnetic member. A portion of the shielding plate facing the magnetic line generator is spaced apart from the back surface of the workpiece.

A magnetic material having fluidity is filled between the part of the magnetic line generating device and the shielding plate facing the magnetic line generating device and the workpiece, respectively, and the magnetic members of the magnetic line generating device and the shielding plate are filled with a magnetic material having fluidity. The respective magnetic bodies are restrained by lines of magnetic force formed between the front and back surfaces of the object to be welded, thereby airtightly shielding the inside and outside of the airtight container.

In the present configuration, the magnetic member constituting at least the portion of the shielding plate facing the magnetic line of force generator may be magnetized (ie, a magnet) or non-magnetized.

If the magnetic member of this shielding plate has a magnetized portion, the magnetic member also serves as a magnetic force line generator.

When configured as in 2 above, the fluid magnetic material is restrained between the magnetic field line generator on the side of the airtight container and the surface of the workpiece, and between the magnetic member of the shielding plate and the back surface of the workpiece. is held and moved together with the airtight container and the shielding plate relative to the workpiece, so that the airtight container is maintained in a state of being shielded from the inside and outside.

In this case, since the object to be welded is made of a non-magnetic material, the magnetic material will not adhere to the object and be lost.

The present invention will be described in detail below with reference to the drawings.

1 and 2 show an embodiment of the present invention,
In these figures, 1 is an airtight container that opens in one direction, and 2 is an airtight container that opens in one direction.
is an object to be welded made of non-magnetic material.

The airtight container 1 is placed on the surface of the workpiece 2 with its opening located on the workpiece 2 side, and there is no space between the open end of the airtight container 1 and the surface of the workpiece (not shown). such that a constant gap is created by positioning means, e.g. wheels (
It's happening.

Reference numeral 3 denotes a welding heat source generator installed approximately in the center of the ceiling wall of the airtight container 1, and this heat source generator is, for example, an electron gun that generates an electron beam or a torch for arc welding.

Reference numeral 4 denotes an exhaust pipe connected to a through hole provided in the side wall of the airtight container 1, and this exhaust pipe is connected to an exhaust device (not shown).

A first magnetic field line generator 5 is provided so as to surround the outer surface of the opening side end of the airtight container 1 .

This magnetic field line generator includes a strip-shaped first magnetic pole body 6 attached along the outer surface so as to surround the outer surface of the airtight container;
One pole (N in the illustrated example) is attached to the upper end side surface of the first magnetic pole body.
A magnetic field line generator, for example, a permanent magnet 1, which is arranged so that its poles (poles) are in contact with each other, and a magnetic field line generator that is arranged so that its upper end side surface is in contact with the other pole (in the illustrated example, the S pole) of the permanent magnet (magnetic field line generator) 1. It consists of a first magnetic pole body 8 which is shaped like a strip, and a second magnetic pole body 8 which is shaped like a similar strip.

The first and second magnetic pole bodies 6 and 8 are positioned such that the ends (magnetic shadow parts) on the side of the workpiece face the workpiece 2 with a certain gap therebetween.

In order to constitute an airtight device that airtightly covers the back surface of the workpiece 2, that is, the surface side opposite to the airtight container 1, a shielding plate 9 is arranged so as to face the backside of the workpiece. A second magnetic line generating device (magnetic member) 10 having different polarities facing the first magnetic line generating device 5 is attached to the peripheral portion with a spacer member 11 interposed therebetween.

This second magnetic field line generator can be constructed of a single permanent magnet or a combination of a permanent magnet and a magnetic material, and in the illustrated example, the outer end in the width direction is the north pole and the inner end is the south pole. It consists of a strip-shaped permanent magnet.

The second magnetic field line generating device 10 is positioned by appropriate means such as wheels so that a constant gap is formed between it and the surface of the workpiece 2 to be welded.

Each gap between the magnetic pole parts of the first and second magnetic field line generators 5 and 10 and the surface of the workpiece 2 contains a fluid magnetic material 12, for example, magnetic fine particles such as ferrite, or magnetic fine particles. The space between the airtight container 1 and the object to be welded 2 and the space between the shielding plate 9 and the object to be welded 2 are both kept airtight when filled with the magnetic material 12. Assembling and mounting of each magnetic field line generating device is being carried out in a manner that the magnetic field line generators are hanging down.

In the embodiments shown in FIGS. 1 and 2, the second magnetic field line generating device 10 is composed of a strip-shaped permanent magnet, but as shown in FIG. 3, it is composed of a permanent magnet having a U-shaped cross section. You can also do that.

In addition, as shown in FIG. 3, grooves are continuously provided in the magnetic pole parts of the first and second magnetic field line generators 5 and 10, and a fluid magnetic material is formed between the trapezoid and the back surface of the workpiece. It can also be configured to hold 12.

When the different magnetic poles of the first and second magnetic force line generators are configured to face each other as described above, a magnetic closed circuit is formed within an arbitrary longitudinal section, and the fluid magnetic body 12 is restrained by this magnetic force. The inside of the airtight container 1 is kept airtight.

That is, although the workpiece 2 is a non-magnetic material, the lines of magnetic force formed by the first and second magnetic line generation devices 5 and 10 are as follows: first magnetic pole body 6 → workpiece 2 → second magnetic field line generation device 10
The magnetic body 12 is perpendicular to the surface of the workpiece 2 to form a closed circuit that passes through the S pole of the generator 10 → the N pole of the generator 10 → the workpiece 2 → the second magnetic pole body 8 → the first magnetic field line generator 7. is constrained in the direction of

Moreover, in this case, since the magnetic body 12 has fluidity, the airtight state can be maintained even if the airtight container 1 and the shielding plate 9 are moved along the surface of the workpiece.

Furthermore, since the object to be welded is made of a non-magnetic material, the magnetic material will not be absorbed by the non-magnetic material and be lost, and the amount of the magnetic material will not decrease.

Furthermore, even if excess buildup occurs after welding, it will not wear out unlike when using an 01J ring or backing, and will not change in quality due to high temperatures.

Furthermore, if the shielding plate 9 is placed on the opposite side of the airtight container as described above, the butt portions of the objects to be welded may be uneven and there are gaps, or the objects to be welded may melt during welding and the space above and below the objects to be welded will be connected. Even in such a case, the inside of the airtight container 1 can be kept fairly airtight.

Therefore, when performing electron beam welding using, for example, an electron gun as the heat source generating device 3, after creating a vacuum state in the airtight container through the exhaust pipe 4, the electron beam is directed to the welding part, and the airtight container 1 and the shielding plate are Welding can be performed by moving the parts 9 and 9 along the welding line relative to the workpiece by a drive source 7 (not shown).

Note that when the workpiece 2 to be welded is fixed and the airtight container and shielding plate are moved, it goes without saying that they should be moved in synchronization.

In addition, when an arc welding head is used as a heat source generator for welding, welding can be performed by creating a special atmosphere inside the airtight container by reducing the pressure inside the airtight container, or by injecting a shielding gas such as argon or helium after the pressure has been reduced. It is done.

4 and 5 show another embodiment of the present invention. In this embodiment, a shielding plate 13 made of a magnetic member is kept constant in order to constitute an airtight device on the back side of the workpiece. The magnetic field line generating device 5 of the shielding plate 13 is arranged through a gap.
A fluid magnetic material 12 is filled in the gap between the portion facing the magnetic pole portion of the weld and the back surface of the workpiece.

In this device, the magnetic lines of force generated from the magnetic line of force generator 5 flow through the shielding plate 13 and restrain the magnetic body 12 .

In this embodiment as well, by moving the shielding plate 13 and the airtight container 1 relative to the workpiece 2 in synchronization with each other, the magnetic bodies 12 on both sides of the workpiece can be maintained in a restrained state. Can be done.

In this embodiment, it is also possible to replace the magnetic line generator 5 with a magnetic member and arrange the magnetic line generator on the shielding plate 13 side.

In the above description, a permanent magnet was used as the magnet of the magnetic field line generator, but it goes without saying that an electromagnet can be used as the magnet.

Even when the object to be welded is made of a magnetic material, a magnetic field line generating device surrounding the outer end of the opening of the airtight container is installed away from the surface of the object to be welded, so that the flow between the magnetic field line generating device and the surface of the object to be welded is prevented. The airtight container can be kept airtight by filling the airtight container with a magnetic material having properties.

However, when the object to be welded is made of a magnetic member,
The fluid magnetic material is directly adsorbed and restrained on the surface of the workpiece, so if the airtight container is changed relative to the workpiece, the fluidity magnetic material will not be attached to the workpiece. It is difficult to move it smoothly.

In particular, the magnetic bodies disposed at the front and rear portions of the airtight container in the traveling direction are likely to be released from their restrained state, and the airtightness of the airtight container is likely to be broken.

In addition, since fluid magnetic substances tend to adhere to objects to be welded, as the airtight container moves, the amount of magnetic material interposed between the magnetic field line generator and the object to be welded decreases, making the airtight container less airtight. In order to maintain the retention, the troublesome work of successively replenishing fluid magnetic material is required.

On the other hand, if the object to be welded is limited to those made of non-magnetic materials and constructed as in the present invention, the fluid magnetic material is not directly attracted to the object to be welded, so the airtight container is The magnetic material, which has fluidity when moved relative to the object, can be easily moved relative to the object while being restrained between the magnetic field line generator and the object to be welded, ensuring airtightness of the airtight container. can be done.

Further, in this case, since the magnetic material is difficult to adhere to the workpiece, the amount of the magnetic material does not decrease, and the troublesome work of replenishing the magnetic material in the solution is not required.

As described above, according to the present invention, a magnetic force line generator that surrounds the open outer end of an airtight container disposed on the surface side of a workpiece made of a non-magnetic material is provided away from the surface of the workpiece to generate magnetic force lines. A magnetic material having fluidity is filled between the generating device and the surface of the workpiece, and at least a portion of a shielding plate placed on the back side of the workpiece facing the magnetic field line generating device is made of a magnetic member. A fluid magnetic material is filled between the part facing the magnetic field line generator and the workpiece, and the airtight container and shield plate are moved relative to each other while synchronizing the shielding plate and the workpiece. Since the fluidic magnetic material is not attracted to the object to be welded,
It can be held in a restrained state and moved relative to the workpiece.

Therefore, it is possible to smoothly move the fluid magnetic material together with the airtight container to the workpiece to be welded, thereby maintaining the airtightness of the airtight container.

Further, as the welding progresses, the magnetic material does not adhere to the workpiece and is not lost, so there is no need to replenish the magnetic material.

Furthermore, since the magnetic material used as the airtight retaining means is not worn or damaged unlike O-rings, packings, etc., repair work is not required and workability can be improved.

[Brief explanation of the drawing]

1 and 2 are a front sectional view and a side sectional view showing an embodiment of the present invention, respectively, FIG. 3 is an enlarged view showing a modification of section A in FIG. 1, and FIGS. 4 and 5. 2A and 2B are a front sectional view and a side sectional view, respectively, showing other embodiments of the present invention. 1... Airtight container, 2... Item to be welded, 4
... Exhaust pipe, 5, 10 ... Magnetic field line generator, 12 ... Fluid magnetic material, 13.
·····Shield.

Claims (1)

[Claims] 1. A welding heat source generator is installed in an airtight container made of a non-magnetic material that opens toward the object to be welded, and the airtight container is placed on the surface of the object to be welded, and the airtight container is placed on the back side of the object to be welded. In the airtight welding apparatus, the airtight welding apparatus includes shielding plates facing each other in the container, and performs welding by moving the object to be welded, the airtight container and the shielding plate relative to each other while synchronizing the airtight container and the shielding plate. A magnetic force generating device having opposing magnetic poles surrounding an outer end of the opening is provided away from the surface of the workpiece, and at least a portion of the shielding plate facing the magnetic line generating device is made of a magnetic member. A portion of the shielding plate facing the line of magnetic force generating device is spaced apart from the back surface of the object to be welded, and a flow is generated between the line of magnetic force generating device and the portion of the shielding plate facing the line of magnetic force generating device and the object to be welded. The magnetic material is filled with a magnetic material having a magnetic property, and each of the magnetic materials is restrained by a magnetic field line formed between the front and back surfaces of the workpiece by the magnetic field line generator and a portion of the shielding plate made of a magnetic member. An airtight welding device formed by airtightly shielding the inside and outside of the airtight container.