JPS5851794B2 - Densibee Muyousetsouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a fixed frame body that covers at least a portion of the workpiece, and a cart mounted with an electron beam welding head consisting of an electron gun, a converging lens, etc., parallel to the weld line. The present invention relates to an electron beam welding device that performs welding while traveling.

Generally, when welding a workpiece while irradiating a charged particle beam (hereinafter referred to as an electron beam) to the workpiece, if the atmosphere or gas exists in the path of the electron beam, the electron beam and gas molecules will collide and the energy density will decrease. Electron beams are used in low vacuum (10
~10 Torr) or high vacuum (10~10
Torr), the object to be welded is irradiated.

As a conventional welding device of this type, for example,
A device disclosed in Japanese Patent No. 28028 is known.

In this device, as shown in FIGS. 1 to 3,
A frame body 1 with a slot 101 bored approximately in the center of the upper and lower surfaces.
is arranged on the upper surface of the workpiece W to be welded, and welding is performed while a trolley 2 carrying a welding electron beam head 4 consisting of an electron gun, a converging lens, etc. moves on the frame 1 in its longitudinal direction.

Of course, during welding, the portion of the slot 101 that is not directly under the welding electron beam head 4 is hermetically closed with an airtight device, and
The side and lower surfaces of the object to be welded are made airtight with an airtight tape or the like, and the frame and the upper surface of the object are made airtight with an airtight sealing material.

In this device, the atmospheric pressure is now 1 atm (=760 H
g), and assuming that the inside of the frame is placed in a vacuum state of 10 to 10 Torr, the frame will be exposed to Po due to atmospheric pressure.
It is pressed to shrink with a certain amount of pressure.

P here.

is Po=760×13.6kg/m2-:1.
It is given in 034 kg.

However, the pressure P1 which tends to expand the frame is shown below.

Pl ~13.6X10
When the inside of the frame is made into a vacuum state in this way, the frame becomes (PO
-pl) are pressed inward to each other with uniformly distributed pressure.

However, in order to allow the cart on which the welding electron beam head is mounted to move freely in the Y direction, slots are bored at approximately the center of the upper and lower surfaces of the frame, so the portion of the frame that extends in the Y direction ``Moment of inertia of the section'' with respect to the X-direction force of
is relatively small, and as a result, as shown by the two-dot chain line in Fig. 3, the frame deforms inward due to the above pressure, making it difficult for the cart to run smoothly and, therefore, resulting in poor welding. was there.

In addition, in order to eliminate this drawback,
It has been attempted to increase the "moment of inertia of the cross section," but this has the disadvantage that the longer the line to be welded, the larger the frame becomes, which increases the weight, and the welding equipment becomes larger.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electron beam welding apparatus that eliminates the above-mentioned conventional drawbacks.

The present invention will be explained in detail below with reference to the illustrated embodiments.

In FIGS. 4 and 5, 1 is a box-shaped frame having an upper wall 1a, a lower wall 1b, and side walls 10 to 1f, and the lower wall 1b of this frame is attached to the upper surface of the objects W, W to be welded. It is placed on the workpiece so as to be in contact with it.

The upper and lower walls 1a and 1b of the frame 1 have longitudinal direction (
Slots 101, 101 extending along the Y direction) are bored.

A rail 102 on which the wheels 3 of the truck 2 fit is provided on the upper surface of the upper wall 1a, and the truck 2 moves in the longitudinal direction of the frame 1 while being guided by the rails.

An electron beam head 4 for welding consisting of an electron gun, a converging lens, etc. is mounted on the trolley 2. A slot 10 above the tag frame body 1
The electron beam B is irradiated from the tip 4a of the head inserted into the frame body 1 through the head through the slot 101 at the welding part of the workpiece W to be welded.

Inside the frame 1, push rods 5, 5 are attached which are movable in the X direction perpendicular to the Y direction.

The push rods 5, 5 are removably supported by support members 501, 501 which are attached to the side walls 1c, 1d of the frame 1 located on both sides of the slot 101 in an airtight manner.

The push rods 5, 5 are arranged so that their central axes coincide,
When they are displaced close to each other, their respective tips come into contact.

Upright portions 103, 103 are provided at positions corresponding to the push rods 5, 5 at both ends of the frame 1 in the X direction, and drive devices 6, 103 for linearly displacing the press rods 5, 5 are provided in these upright portions. 6 is installed.

In the illustrated example, hydraulic cylinders are used as these drive devices, and the piston rods of each cylinder are connected to the rear ends of the corresponding push rods 5,5.

The cylinder 6.6 is connected to a fluid pressure source via a pressure fluid switching valve (not shown), and by operating this switching valve and controlling the flow direction of the pressure fluid, the push rod 5.5 is displaced in the X direction. It has become.

A pressing device 7 is constituted by the pressing rods 5, 5 and the cylinder 6.6.

A plurality of similar suppressors γ are attached to the frame 1 in a row at intervals in the longitudinal direction (Y direction).

Reference numeral 8 denotes a sealing material disposed between each of the push rods 5 and the support member 501, and the sliding portion of each push rod is kept airtight by this sealing material.

In addition, the carriage 2 is located in the slot 1 of the frame 1 that is not directly below the head 4.
01 is moved in the Y direction while being kept airtight by a suitable airtight device, and the inside of the frame is hermetically sealed by this airtight device.

9 is a pressing device 7, 7. This is a cart position detection device that is placed near the
Detecting device 9a and X in one direction arranged at the end in one direction
It consists of a detection device 9b in the Y2 direction arranged at the ends in two directions.

The detection devices for the Y1 direction and the Y2 direction are driven by drive devices 6, 6 .
The first detectors 9 are arranged on both sides of...
01 and a second detector 902, and in the illustrated example, limit switches are used as these detectors.

On the other hand, dogs 11a and 11b for operating limit switches are attached to both ends of the truck 2 in the X direction, and when the truck 2 moves in the When the tip 4a of the head 4 approaches the push rods 5, 5, the dog 11a on the end side in the X1 direction operates the first detector 901, and then the tip 4a of the head 4 approaches the push rods 5, 5. After passing through the dog 11a, the second detector 9
02 is operated.

Similarly, when the cart 2 moves in the Y2 direction, the dog 11b on the end side in the X2 direction alternately operates the first detector 901 and the second detector 902 of the detection device 9b in the Y2 direction. There is.

The first and second detectors 901 and 902 are electrically connected to a pressure fluid switching valve control device (not shown) of the corresponding drive device 6, so that when the detector 901 of the broom 1 operates, the When the second detector 902 is activated, the push rods 5.5 are moved in a direction in which they are engaged with each other. ing.

In the example shown in FIG. 6, when the trolley 2 moves, the dog 11a contacts each detector of the detection device in the ¥1 direction, and at the same time the dog 11b contacts each detector of the detection device in the ¥2 direction. However, a limit switch as a detector in the Y1 direction operates only when its contact is displaced in the Yl direction, and a limit switch as a detector in the Y2 direction operates only when its contact is displaced in the Y1 direction. It is designed to operate only when it is displaced in two directions.

Next, the present invention will be explained in detail.

For welding, first, the cart 2 is stopped, for example, at the end in the ¥2 direction shown in the figure, and each drive device 6 is operated to displace the push rods 5, 5 of each pressing device 7 in a direction in which they approach each other. .

In this case, the strobes of each drive device (cylinder in the illustrated example) are selected so that the push rods 5, 5 do not press against each other but face each other with a small gap between them.

Next, the inside of the frame 1 is evacuated using an exhaust device (not shown), and the inside of the frame 1 is brought to an appropriate vacuum state (for example, 10 to 10 t).
orr).

As a result, the frame 1 is pressed from the outside with a force of (, po-pl), so the side walls 1c and 1d try to deform in the X direction, but as described above, the press rods 5 and 5 are Since the side walls 1c and 1d face each other, the deformation of the side walls 1c and 1d when the inside of the frame is evacuated is only by the amount corresponding to this minute gap.

After the side walls 1c and 1d are slightly deformed, the press rods 5 and 5 engage with each other, so that these press rods act as if they were reinforcing materials and prevent the frame 1 from deforming.

After the inside of the frame 1 is made into a vacuum state in this manner, the workpieces W, W to be welded are irradiated with the electron beam B generated from the head 4, and the trolley 2 is moved in the Y1 direction to perform welding.

When the trolley 2 moves in the ¥1 direction, the push rod 5 of the first push device 7
5, the first detector 901 of the detection device 9a in the 1 direction operates, so the 1 drive device 6 operates and these push rods 5, 5 retract in the direction away from each other.

Therefore, the tip 4a of the head 4 passes through the positions of the press rods 5, 5 of the first pressing device without being interfered with by the press rods 5.5, and the beam B is also not obstructed by the press rods.

At this time, the press rods of the other press devices 7°I, .

When the tip 4a of the head 4 passes the position of the first press rods 5, 5, the dog 11a operates the second detector 902, so the drive device 6 operates and these press rods 5, 5 approach each other again. These push rods once again act as reinforcing materials.

The trolley 2 is further displaced in the Y1 direction and the push rod 5 of the next pushing device is
, 5, the first detector 901 operates in the same way as above and these push rods 5, 5 are retracted, and when the trolley 2 passes the position of these push rods, the second detector 902 operates. Then the push rods 5, 5 come into contact again.

Thereafter, the same operation is repeated every time the truck 2 passes the position of each suppressing device, and welding is performed without any hindrance due to the presence of the tag pushers 5, 5.

After welding has been performed up to the end in the Y direction in this way, the truck 2 is stopped and the irradiation of the electron beam is stopped. Then, after the vacuum state is released, the push rods 5 of each pushing device T are
, 5 are separated and the welding work is completed.

When performing the next welding, the cart 2 may be moved to the end in the ¥2 direction and stopped, and then welding may be performed in the same manner as above, but the cart 2 may be moved to the end in the Y direction and then stopped. In the welding operation of stopping and returning, it is advantageous to carry out welding while moving the cart 2 in the two directions because the working time can be shortened.

When welding is performed by moving the cart in the Y2 direction,
The first and second detectors of the two-direction detection device 9b operate alternately to perform the same operation as described above.

FIG. 7 shows another embodiment of the present invention, in which the push rod 5 is prevented from rotating and is constrained to perform only linear movement in the X direction.

A female screw portion 502 is provided at the rear end of the press rod 5, and the inside of the press rod is formed hollow to receive a screw rod screwed into the female screw portion 502.

The drive device 6 includes a rotary drive source 601 such as an electric motor and a threaded rod 602 that is rotationally driven by the rotary drive source.
A threaded rod 602 is screwed into the threaded portion 502 of the push rod 5.

Therefore, by rotating the threaded rod 602 by the rotary drive source 601, the push rod 5 can be displaced in the X direction, and by cooperating the cart position detection device 9 with the rotary drive source of each drive device, as shown in FIGS. The same operation as the embodiment shown in FIG. 6 can be performed.

Note that 603 is a limit switch, 604 is a dog that operates this limit switch, and when the push rod 5 is displaced to a predetermined position and the limit switch 603 is operated, the rotational drive source 601 is stopped.

FIG. 8 shows still another embodiment of the present invention. In this embodiment, the side edge of the upper wall 1a of the frame 1 is used as a guide rail 102 for guiding the trolley 2. It runs in the Y direction while holding this guide rail part.

Therefore, the guide portion 2a of the truck 2 is connected to the upper wall 1a of the frame 1.
Since the guide portion 2a is located further down, it is necessary to prevent the drive device 6 from becoming an obstacle when the guide portion 2a passes the position of each pressing device 7.

Therefore, in this embodiment, a collar 5a is provided at the tip of the push rods 5, 5 to prevent the push rod 5 from being pulled out from the support member 501, and a collar portion 5a is provided at the outer end of these push rods. A coil spring 12 is disposed between the collar portion 5b and the support member 501, and this coil spring always urges the push rods 5, 5 in a direction to separate them.

A fluid pressure cylinder is used as the drive device 6, and the piston rod of the cylinder is in a position where it retreats so as not to contact the guide portion 2a of the truck 2 when it passes, and the push rod 5.
The push rods 5 can be moved between positions where they engage with the rear ends of the corresponding push rods 5 so as to bring the push rods 5 closer to each other.

Further, in this example, the materials to be welded W, W are illustrated as tubular bodies, and a member 13 having a cylindrical surface 13a that is in close contact with the surface of the tubular body is attached to the lower surface of the frame body 1.

When configured as shown in FIG. 8, when the cart 2 approaches each pressing device 7 and the first detector 901 operates, the driving device 6
When the piston rod retreats, a gap is formed between the push rods 5, 5, and at the same time, a gap is formed between the tip of the piston rod and the rear end of the push rod 5 for allowing the guide portion 2a of the truck 2 to pass through. Therefore, the trolley 2 can be moved smoothly.

Furthermore, when the truck 2 passes the position of each pressing device 7 and the second detector 902 is activated, the piston rod of each driving device extends and engages with the rear end of the corresponding pressing rod 5, causing the pressing rod to 5
, 5 are moved toward each other against the biasing force of the coil spring 12, and their tips are engaged, thereby reinforcing the frame 1.

FIGS. 9 and 10 show modified examples of the tip shapes of the push rods 5, 5 that can be used in the present invention.
If the tips of the push rods are made into these shapes, the tips will fit into each other when the push rods approach each other, so that displacement of the frame can be more precisely prevented.

Although limit switches were used as the first and second detectors in the above embodiments, the present invention is not limited to limit switches, and other detection means such as proximity switches, phototubes, phototransistors, CdS, etc. may also be used. A photoelectric switch can also be used.

Also, each pressing device is provided with two pressing rods, but each pressing device is provided with only one pressing rod, and this one pressing rod presses the side wall of the frame on the side where no pressing rod is provided. It can also be configured as follows.

In the above embodiment, the frame 1 is placed on the object to be welded, but the present invention can be similarly applied to an electron beam welding apparatus that welds the object placed within the frame.

As described above, according to the present invention, the frame can be reinforced through the press rod that does not interfere with the electron beam head for welding, so even if the inside of the frame is in a vacuum state, the frame hardly deforms. Therefore, the cart on which the welding electron beam head is mounted can be accurately positioned and smoothly moved, and welding can be performed satisfactorily.

In addition, even if the welding length becomes longer and the longitudinal dimension of the frame is extended, there is no need to make the frame itself strong to prevent deformation as in the past. There is an advantage that the welding apparatus can be easily moved and positioned without increasing the weight or unnecessarily increasing the size.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conventional device, FIG. 2 is a plan view of FIG. 1, FIG. 3 is an explanatory diagram of the state of FIG. The figure is a sectional view taken along the line v-V in Fig. 4, Fig. 6 is an explanatory diagram showing the arrangement of the detector in the actual case of Fig. 4, and Fig. 7 is a vertical half view showing another embodiment of the present invention. 8 is a vertical sectional view similar to FIG. 5 showing still another embodiment of the present invention, and FIGS. 9 and 10 are sectional views showing modifications of essential parts of the present invention. 1...Frame body, 101...Slot, 1
02...Rail, 2...Dolly, 4...
... Electron beam head for welding, 5 ... Pressing rod, 6 ... Drive device, 7 ... Pressing device,
9...Bogie position detection device.

Claims (1)

[Claims] 1. A frame body provided with a slot substantially parallel to a line to be welded and formed to cover at least a part of the periphery of the object to be welded; a cart that runs on the frame body in the direction of the line to be welded; A welding electron beam head mounted on a dolly, and an airtight device that allows the dolly to run while airtightly closing a slot portion that is not directly below the welding electron beam head, and In an electron beam welding apparatus for welding the workpiece while maintaining a vacuum state, the push rod is provided movably in a direction substantially perpendicular to the longitudinal direction of the slot of the frame, and the push rod is supported by the frame. A plurality of suppressing devices are provided in the longitudinal direction, each of which includes a drive device that displaces the rod in a direction substantially perpendicular to the longitudinal direction, and the drive device prevents deformation of the frame via the push rod. and a truck position detection device for detecting that the truck approaches each suppression device and that the truck passes near the position of each suppression device, and the truck position detection device detects when the truck When it is detected that the vehicle has approached each suppressing device, the push rod of the suppressing device is evacuated to a position that does not interfere with welding, and when it is detected that the cart has passed near the position of the pressing device. The electron beam welding device is characterized in that the cart position detection device is made to cooperate with each of the pressing devices so as to displace the pressing rod of the suppressing device to a position where deformation of the frame is prevented. .