JP2944268B2 - Automatic welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic welding apparatus capable of accurately welding fillets of various kinds of products.

FIG. 2 (A) is a plan view of a floor beam to be welded by the automatic welding apparatus of the present invention, FIG. 2 (B) is a front view thereof, and FIG. 3 (A) is also a welding object. stairs floor joists plan view of FIG. 3 (B) is a front view thereof. As shown in FIGS. 2 (A) and 2 (B) , the floor beam 1 is provided with end plates 3, 3 having a substantially L-shaped cross section at both ends of the square pipe 2 by fillet welding 4, 4.
It is welded and fixed . Also, stair floor joists 5 is made by fixing substantially L-shaped end plate 7 of the section fillet welding Therefore welded to the opening of the one end of the square pipe 6.

Conventionally, in order to manufacture the floor beam 1 or the stair floor beam 5 as described above, the square pipe 2 and the end plate 3 or the square pipe 6 and the end plate 7 are positioned at predetermined positions using a positioning jig. (1) whether fillet welding is manually performed in this state (Japanese Patent Application Laid-Open No. 61-115672);
(2) Fillet welding is performed by a welding robot.

FIG. 4 is a schematic view showing an outline of a main part of a conventional welding robot. FIG. 2 (A), welding the end plates 3 of the floor joists 1 shown in FIG. 2 (B), using a welding robot which comprises a first welding head 8 and a second welding head 9,
The first welding head 8 has one end plate 3 and the second welding head 9
Is to weld one end plate 3 .

[0005]

The manual welding of the above (1) has low productivity and is not preferable as a means for producing mass-produced products.

In the welding operation by the robot (2), the distance between the first welding head 8 and the second welding head 9 is not adjusted after the welding operation is started. Can not absorb the error of the
Defective products may occur. That is, for example, when the second welding head 9 is used as a reference side, the above-described adjustment is not performed, and since each of the welding heads 8 and 9 follows an accurately determined trajectory, there is an error in the length of the square pipe 2. The position of the first welding head 8 deviates from the welding line, and accurate welding of the end plate is not performed.

In order to prevent such a problem from occurring, it is sufficient to use only one welding head and invert the work by 180 ° to sequentially weld the end plates at each end opening. The working time is greatly increased as compared with the case of simultaneous welding at both ends opening using both the first and second welding heads, and an increase in cost cannot be avoided.

The present invention has been made in view of the above circumstances, and it is possible to manufacture a member formed by fillet-welding an end plate to an end of a square pipe with high productivity, and to absorb errors in the length of each pipe. To provide an automatic welding device that can accurately perform welding on both ends

[0009]

According to the present invention, there is provided an automatic welding apparatus comprising: a square pipe positioning portion for supporting and positioning a square pipe serving as a main member of a floor beam; A work positioning jig provided with an end plate positioning portion for supporting an end plate to be welded to the opening of the portion, and a welding torch carriage mounted on and moving with the end plate positioning portion. .

[0010]

In the automatic welding apparatus of the present invention having the above structure,
When the welding torch carriage is mounted on the end plate positioning part, and the end plate is in contact with both ends of the square pipe, the welding torch of the welding carriage that moves with the end plate positioning part must be on the welding line. Thus, even if there is an error in the length of the square pipe, this can be absorbed and accurate welding can be performed.

[0011]

FIG. 1 is a plan view of a main part of an embodiment of the present invention. In this figure, a work positioning jig 11 supports square pipe positioning portions 12 and 12 for localizing the square pipe 2 and feeds which support the end plates 3 and 3 so that the centers of the square pipe support portions 12 and 12 coincide with each other. It has end plate positioning parts 14 and 14 which are advanced and retracted with respect to the square pipe support parts 12 and 12 by the screws 13 and 13. In the drawing, reference numerals 15 and 15 denote guide rods penetrating through the vicinity of both side edges of the end plate positioning portions 14 and guide the end plate positioning portions 14 and 14 when the feed screws 13 and 13 are driven. Is what you do.

Further, welding torch carriages 17, 17 carrying welding torches 16, 16 are mounted on the end plate positioning portions 14, 14, respectively.

The square pipe positioning portions 12, 12 having the above-described configuration.
The automatic welding apparatus according to the present invention, comprising a work positioning jig 11 having end plate positioning portions 14 and 14 and welding torch carriages 17 mounted on the end plate positioning portions 14, 14 is as follows. Works as follows. First,
The square pipe 2 is supported by the square pipe positioning units 12 and 12 automatically or manually, and the end plates 3 and 3 are supported by the end plate positioning units 14 and 14, respectively.

Next, the feed screws 13, 13 are driven automatically or manually to advance the end plate positioning portions 14, 14 toward the end of the square pipe 2, and the end plate positioning portion 1,
The end plates 3, 3, which are stereoscopically supported on the pipes 4, 14, are connected to the square pipe 2.
Abut on both ends. Here, the welding torches 16, 16 are operated to perform the fillet welding of the end plates 3, 3 at the end opening of the square pipe 2.

Thus, in the automatic welding apparatus of the present invention, the welding torch carriages 17, 17 are mounted on the end plate positioning portions 14, 14. Therefore, in a state where the end plates 3 and 3 are in contact with the openings at both ends of the square pipe 2,
Welding torch 1 moving with end plate positioning parts 14,
6 and 16 are always on the welding line, and even if there is an error in the length of the square pipe 2, it can be absorbed and accurate fillet welding can be performed.

Further, in the automatic welding apparatus of the present invention having the above structure, the stop position of the welding torch is determined by the end plate positioning portion 1.
Since it is determined when the end plates 3, 3 supported and positioned on the end plates 4, 14 abut against the ends of the square pipe 2, any end plate 3, 14 can be set within the movable range of the end plate positioning portions 14, 14. Welding of end plates to square pipes of length can be performed.

The present invention is not limited only to the above embodiment. For example, if a stopper 18 indicated by a dotted line in the figure is detachably provided between the two square pipe positioning portions 14 and 14 to position the short square pipe 6 (FIGS. 3A and 3B), one end plate positioning portion welding torch carriage is used. And FIG.
(A) and (B) can manufacture the staircase floor beam 6 shown in FIG. In this case, by changing the installation position of the stopper 18, the end plate can be welded to the square pipe 6 having an arbitrary length.

Further, the end plate positioning portions 14, 14 may be driven not by the feed screws 13, 13 but by an air cylinder or the like.

Further, by automatically and sequentially performing the mounting of the square pipe, the mounting of the end plate, the operation and stop of the welding torch, and the removal of the finished product, the welding operation can be completely automated. It is.

[0020]

As is apparent from the above description, in the automatic welding apparatus according to the present invention, even if there is an error in the square pipe which is the main member of the floor beam, the error is absorbed and accurate welding can be performed with high productivity. It can be carried out. Further, it is possible to cope with the production of various types of floor beams having square pipes having different lengths as main members.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of an embodiment of the present invention.

FIG. 2A is a plan view of a floor beam to be welded by the automatic welding apparatus of the present invention, and FIG. 2B is a front view thereof.

FIG. 3A is a plan view of a staircase floor beam to be welded similarly, and FIG. 3B is a front view thereof.

FIG. 4 is a schematic view showing an outline of a main part of a conventional welding robot.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Floor beam 2 ... Square pipe 3 ... End plate 4 ... Fillet welding part 11 ... Work positioning jig 12 ... Square pipe positioning part 13 ... Feed screw 14 ... End plate positioning part 16 ... Welding torch 17 ... Welding torch carriage 18 ... Stopper

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-72859 (JP, A) JP-A-59-39478 (JP, A) JP-A-54-51232 (JP, A) 174793 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B23K 9/00 501 B23K 9/28 B23K 37/04 B23K 37/053

Claims (5)

(57) [Claims] 1. A square pipe positioning portion for positioning and supporting a square pipe serving as a main member of a floor beam, and an end plate which is advanced and retracted with respect to the square pipe positioning portion and welded to the square pipe end opening. An automatic welding apparatus comprising: a work positioning jig provided with an end plate positioning portion to be supported; and a welding torch carriage mounted on and moving with the end plate positioning portion. 2. The automatic welding apparatus according to claim 1, wherein the end plate positioning portion is driven by a feed screw. 3. The automatic welding apparatus according to claim 1, wherein said end plate positioning section is driven by an air cylinder. 4. Two end plate positions corresponding to both ends of the floor beam.
Has-decided Me section, automatic welding device according to any one of claims 1 to 3, characterized in that the stopper has freely <br/> provided removably between the two end plate positioning portion. 5. The automatic welding apparatus according to claim 4, wherein said stopper has a variable position.