JPH11129079A - Thermal processing method and thermal processing apparatus - Google Patents

Abstract

[PROBLEMS] To prevent deformation of a member due to the influence of thermal expansion in thermal processing. The processing procedure includes a plurality of restraining devices 1 on both sides of a processing line of workpieces 31 and 32 along the processing line.
The workpieces 31 and 32 are held down by 1 and 12, and then the tool 21 of the friction stir welding apparatus of the thermal processing apparatus performs welding along the processing line and passes through the restraint apparatuses 11 and 12. Then, the restraint by the passing restraint devices 11 and 12 is released. According to this, a favorable processed appearance can be obtained when the member is thermally processed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing method for processing a member by applying heat thereto, and more particularly to a method and a device for restraining a processed member during processing. In particular, the present invention is suitable for restraining members in friction stir welding suitable for joining aluminum alloy members used in railway vehicles and buildings.

[0002]

2. Description of the Related Art In friction stir welding, a round bar-shaped tool (rotary body) inserted into a joint is rotated to generate heat, soften, and join. It does not join by melting members like MIG welding. The friction stir welding is applied to the butted portion and the overlapped portion. This is disclosed in Japanese Unexamined Patent Publication No. 7-50509.
No. 0 (EP0615480B1), Welding & Meta
lFabrication January 1995 See pages 13-16.

[0003]

When processing is performed by applying heat to a member (for example, friction stir welding), heat is accumulated in the member to be processed as the processing proceeds. When the member is constrained, the member is deformed after processing due to the influence of heat between the constrains.

This will be described with reference to FIGS. 9 and 10 in the case of friction stir welding. By rotating the round bar-shaped tool 21 inserted into the joint of the two members 33, the members generate heat,
It softens and joins. The tool (rotating body) 21 moves in the left-right direction in FIG. Member 33 to be joined
Are restrained to the gantry 41 at substantially equal intervals by the restraint 19. The restraint 19 presses the member 33 against the gantry 41 so that the distance between the two members 33 does not change due to the force during friction stir welding. Therefore, the member 33 undergoes thermal expansion due to heat accumulation during friction stir welding. The member 33 is the restraint 19
Member 33 which has been thermally expanded
Is a restraining jig 19 adjacent to the restraining tool 19 as shown in FIG.
And a deformation 34 occurs between them. For this reason, the member 33 after the friction stir welding is deformed by heat along the joining line, and the appearance as a product is poor. This becomes more noticeable as the length of the member becomes longer.

[0005] The same applies to the case of MIG welding, thermal cutting equipment and the like.

An object of the present invention is to reduce the influence of thermal expansion due to processing of a constrained member and improve the appearance of the member.

[0007]

According to the present invention, a plurality of restraining devices hold down the work member along both sides of the work line of the work member along the work line. By processing along the processing line and passing through the restraining device, the restraint of the passing restraint device is released.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is applied to friction stir welding will be described with reference to FIGS. The two members (members to be processed) 31 and 32 to be joined are placed on the gantry 41 with their ends facing each other. Members 31, 3
2 is a gantry 41 from above by a plurality of restraining devices 11 and 12.
It is held down and restrained. Two members 31, 32
The restraint devices 11 and 12 are installed at substantially equal intervals along the line to be joined. The restraint devices 11, 12 hold down the vicinity of the joining line. The tool 21 for friction stir welding includes the member 3
While rotating in the state inserted into the first and the second 32, it is moved along the joining line. The tool 21 has a large diameter portion and a small diameter portion, and the small diameter portion is contained in the members 31 and 32. The boundary between the large diameter portion and the small diameter portion slightly enters members 31 and 32.

A second restraining device 12 is arranged opposite to one restraining device 11. That is, substantially two restraining devices 11 and 12 are installed on a line orthogonal to the joining line.

The restraint devices 11 and 12 are provided with support portions 11B and 1B.
Links 11D and 12D rotatably supported by 2B,
Cylinder 11 connected to one end of link 11D, 12D
A, 12A, and contact portions 11C, 12C installed at the other ends of the links 11D, 12D. The contact portions 11 and 12 are portions that contact the members 31 and 32. Cylinder 11
A and 12A are atmospheric pressures or liquid pressures. Cylinder 11A,
12A is rotatably connected to the gantry 41 and the links 11D and 12D. The supports 11B, 12B and the cylinders 11A, 12A are outside the members 31, 32.

The tool 21 is suspended from a traveling body (not shown) straddling the restraint devices 11 and 12. Cylinder 11
A and 12A operate independently.

In this configuration, first, the members 31 and 32 placed at predetermined positions on the gantry 41 are restrained by the restraint devices 11 and 12. All the restraint devices 11 and 12 operate and press the members 31 and 32 from above.

In this state, the tool 21 is inserted into the members 31 and 32 while rotating, and is moved along the joining line while rotating. The movement of the tool 21 along the joining line is performed by running the traveling body. Generally, the joining is started from the end of the joining line and moved toward the other end.

A control device (not shown) detects the position of the traveling body, that is, the position of the tool 21, and releases the restraint by the restraint devices 11, 12 at the location where the tool 21 has passed. The position coordinate values of the tool 21 and the respective restraint devices 11,
The coordinate values of the twelve constrained positions are compared, and if the former coordinate value exceeds the latter coordinate value, the constraining device 11 of the exceeded coordinate value,
The member 12 is operated to release the restraint of the members 31 and 32. FIG. 3 shows the start of friction stir welding. All the restraint devices 11, 12 hold down the members 31, 32.
In FIG. 4, friction stir welding proceeds, and members 31, 3
When the tool 21 passes through the positions of the restraint devices 11a and 12a that have been holding down 2, the restraint by the restraint devices 11a and 12a is released. For example, when the last part 21a of the tool 21 completely passes through the restraint devices 11a and 12a, and the last part 21a of the tool 21 starts passing through the next restraint devices 11b and 12b, the members 31 by the restraint devices 11a and 12a are used. , 32
Release the constraint. This operation is repeated.

By releasing the restraint, the effect of the heat generated between the conventional restraint positions is released backward in the joining direction, and the function of suppressing the occurrence of distortion is achieved. This makes it possible to improve the appearance after joining.

In particular, the last part 21a of the tool 21 completely passes through the restraint devices 11a and 12a,
When a starts to pass through the next restraint devices 11b and 12b, the restraint of the members 31 and 32 by the restraint devices 11a and 12a is released. According to this, the restraint devices 11a, 12a
Is released without applying any force during friction stir welding, so that there is no change in the distance between the two members.

The embodiment shown in FIGS. 5 and 6 will be described. This embodiment is an example of a schematic diagram of an apparatus when applied to friction stir welding for manufacturing a vehicle body of a railway vehicle. The total length of the vehicle body is about 25 m at the maximum, and the length of the members 31 and 32 to be joined is also about 2
5 m. When joining the members 31 and 32, if the members 31 and 32 are taken in and out from the joining direction (the longitudinal direction of the vehicle body), a total space of about 50 m is required including the space for the device and the taking in and out. This is impractical in terms of equipment installation. Therefore, the apparatus shown in FIGS. 5 and 6 is proposed.

A rail 23 of the traveling body 22 on which the tool 21 is mounted is provided along the longitudinal direction of the gantry 41. The traveling body 22 can travel from the outside of one end of the gantry 41 to the other end. The traveling body 22 has a gate shape and straddles a gantry 41. The tool 21 is suspended from the center of the beam 23 of the traveling body 22 together with a device for rotating the tool.

There are two traveling bodies 14, 14 which can travel in a direction perpendicular to the traveling direction of the traveling body 22. The legs 14a, 14a at both ends of the running bodies 14, 14 are outside the both ends in the longitudinal direction of the gantry 41. That is, the traveling bodies 14 and 14 are gate-shaped and straddle the gantry. The traveling bodies 14 can move to both ends of the gantry 41 apart from each other. Traveling body 14,
When the 14 is moved to both ends of the gantry 41, the members 31, 32 placed on the gantry 41 can be lifted and taken out. The traveling bodies 14 and 14 travel in a direction perpendicular to the traveling body 22.

The restraining devices 13, 13 are suspended from the beams 14a, 14a of the running bodies 14, 14. Running body 14, 1
4 constitutes a holding device. The restraint devices 13 and 13 are beams 1
The members 31 and 32 are pressed with reference to 4a and 14a.
The restraining devices 13 and 13 are pressure or hydraulic cylinders.

In such a configuration, the traveling body 22 is located at one end, and the traveling bodies 14, 14 are located at each end of the gantry. In this state, the members 31 and 32 are loaded into the gantry 41 from above using an overhead crane or the like, or are taken out from above.

When performing friction stir welding, two traveling bodies 1
The tool 21 passes between 4 and 14.

The traveling body 1 with the restraining devices 13, 13 suspended
When the bases 4 and 14 do not move, the base 41 is moved in and out from the lateral end (the direction orthogonal to the longitudinal direction).

The embodiment shown in FIGS. 7 and 8 will be described. The purpose of this embodiment is similar to the embodiment of FIGS.
The restraint devices 11 and 12 described in FIG. 1 are mounted on the gantry 17 and 18. The mounts 17 and 18 have a plurality of rails 17.
a and 18a on the gantry 41. Mount 17,
18 is a rail 17 by a plurality of cylinders 15 and 16.
a, 18a can be moved. The cylinders 15 and 16 are mounted on the base 4
It is fixed to 1. In addition, there are a plurality of rails 17, 18 and cylinders 15, 16 along the longitudinal direction of the gantry 41.

When the members 31 and 32 are to be restrained, the rods of the cylinders 15 and 16 are made to protrude, and the mounts 17 and 18 are brought closer to the members 31 and 32. When taking out the members 31 and 32 or placing them on the gantry, the rods of the cylinders 15 and 16 are retracted with the restraint released as shown in FIG.
2 is large enough to be lifted. Member 31,
When taking in and out 32, as in FIGS. 5 and 6,
The traveling device having the tool 21 is located at the end of the gantry 41.

The mounts 17, 18 are mounted on rails 17a, 18a so that the mounts 17, 18 are not inclined by the operation of the cylinders 11A, 12A.

The present invention can be used for thermal processing devices such as an arc melting device and a thermal cutting device.

The technical scope of the present invention is not limited to the language described in the claims or the language described in the section for solving the problem, and is easily replaced by those skilled in the art. It extends to a range.

[0029]

According to the present invention, when a member is subjected to thermal processing, distortion after processing can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a friction stir welding apparatus according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is a plan view of FIG. 1, showing a state where bonding has progressed.

FIG. 5 is a side view of a friction stir welding apparatus according to another embodiment of the present invention.

FIG. 6 is a left side view of FIG. 5;

FIG. 7 is a longitudinal sectional view of a friction stir welding apparatus according to another embodiment of the present invention at the time of friction welding.

FIG. 8 is a longitudinal sectional view when a member to be joined is replaced in FIG. 7;

FIG. 9 is a longitudinal sectional view of a conventional friction stir welding apparatus.

FIG. 10 is an enlarged view of a portion “10” in FIG. 9;

[Explanation of symbols]

11, 11a, 11b, 12, 12a, 12b, 13 ...
Restraint device, 11A, 12A, 15, 16 ... cylinder, 1
1D, 12D: link, 14: running body, 15, 16: cylinder, 17, 18: base, 21: tool for friction stir welding, 22: running body, 31, 32: member, 41: base.

Continued on the front page (72) Inventor Hisagi Okamura 7-1-1, Omika-cho, Hitachi City, Ibaraki Prefecture Within Hitachi Research Laboratory, Hitachi, Ltd.

Claims (5)

[Claims] A plurality of restraining devices for holding the workpiece along both sides of the processing line of the workpiece along the processing line, and a thermal processing apparatus for performing processing along the processing line; Releasing the restraint by the passing restraint device by passing through the restraint device. 2. The thermal processing method according to claim 1, wherein the thermal processing device is a tool of a friction stir welding device, and a rearmost portion of the tool passes through one restraining device and then passes through the next restraining device. Releasing the restraint of the passing restraint device at the start of the thermal processing method. 3. A gantry on which a member is placed, and a member on the gantry is pressed down from above,
A holding device having a plurality of restraining devices in two rows along the longitudinal direction; and a running device that runs in the longitudinal direction of the gantry, and runs across the holding device, and And a second traveling body that travels with the thermal processing device positioned between the restraining devices, wherein each of the restraining devices independently releases the restraint. 4. The thermal processing apparatus according to claim 3, wherein the holding device includes two traveling bodies that run across the gantry and members on the gantry in a direction perpendicular to the longitudinal direction. A thermal processing apparatus, wherein one of the bodies has the restraining device in one of two rows of the restraining device, and the other of the traveling body has the restraining device in the other row. 5. A gantry on which a member is mounted, a gantry provided at an end in a direction orthogonal to a longitudinal direction of the gantry, and running in the orthogonal direction, a gantry provided on the gantry, and And a restraint device for holding the placed member, wherein the gantry is in a state where the restraint by the restraint device is released.
The thermal processing apparatus, characterized in that the member can be moved upward when the member moves in a direction away from the member, and the restraint devices release the restraint independently.