JPS61147995A - Welding and assembling method of part elements - Google Patents

Abstract

PURPOSE:To obtain a single structure which suppressed the generation of weld strains by holding a tentative assembly of plural part elements by means of a cage-shaped holder made into an integral construction, bringing simultaneously a pair of welding heads near to the same position of the tentative assembly form both sides of the vertical face of said holder and welding the tentative assembly. CONSTITUTION:The plural part elements 1a-1f are held respectively in the tentative assembly state by means of the cage-shaped holder C made into the integral construction and the holder C is turned to the selected turning angle position to position the assembly. A pair of the welding heads are brought near to the same position of the tentative assembly 1 simultaneously from both sides thereof after the above-mentioned positioning or while the holder is turned up to the angle position, then welding is executed. The welding torches in the welding heads are therefore capable of maintaining always the adequate attitude such as, for example, flat welding, with respect to the binding position. The welding with which the beads having good quality are obtainable is thus made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for welding and assembling a plurality of component elements into a single structure by welding.

(51) (When multiple component elements are welded together to form a single structure, the parts are usually assembled in advance to form a temporary assembly, and then the joints are welded. If the assembly has a complex shape and large volume, it is not necessarily easy to handle it during the welding process.Furthermore, welding distortion such as warping occurs when single-sided welding is performed at each joint between the component elements of the temporary assembly. Furthermore, it is difficult to maintain the welding torch of the working head in a suitable position with respect to the joint area, so there is a problem that it is difficult to obtain a structure with uniform finishing accuracy. This method was developed to solve the problems of conventional parts and element assembly methods, and allows both sides to be simultaneously welded while maintaining a suitable welding position so that the parts and elements can be assembled into a single structure with a predetermined assembly accuracy. The purpose is to provide a method for welding and assembling component elements.

To achieve this objective, in the method for welding and assembling component elements of the present invention, a plurality of component elements are combined with each other to form a temporary assembly, which is held by an integrally constructed cage-shaped holder, and this cage-shaped holder is used. The tool is rotated to a plurality of selected positions within a predetermined vertical plane to determine its position, and a pair of welding work heads are inserted from outside the cage-shaped holder from both sides of the vertical plane to form the same temporary assembly. The parts are approached simultaneously and assembled by welding to form a single structure.

m Hereinafter, a method for assembling parts and elements according to an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, a workpiece 1 forming a part of a body frame of a motorcycle, for example, is assembled into a single structure by several component elements 1a to 1g. Upper and lower pair of formwork 20.3
In the case of the embodiment, 0 has opposing joining surfaces that are symmetrical to the road surface, a space surrounding the outside of the temporarily assembled workpiece 1 to be held inside by joining, and a plurality of joint surfaces that can be seen from the outside. A cage-shaped holder C having an opening is formed. Each formwork 20.30 forms a main frame 21.30 forming an outer shell.
31, and sub-frames 22, 32 of a desired shape built inside these.

One formwork 20 serves as a lower mold for arranging each of the component elements 18 to 1 one by one from a single state to an initial temporary assembly position.
In the sub-frame 22, for example, the parts that hold and support the component element 1a of the pipe body and the component element 1Ω of the joint 7 flange from below are provided as a semicircular clamping part 22a and a groove clamping part 22Q. It is being Similarly, component element 1c
, 1f are engaged and held by holding parts such as holding parts 22a to 22f on the sub-frame 22, which hold each component element. Other component elements and their corresponding clamping portions are labeled with relevant reference numerals.

On the other hand, in the formwork 30 which becomes the upper mold, there are also semi-circular clamping parts on the lower mold side at positions corresponding to the clamping parts of various shapes provided on the sub-frame 22 side of the lower mold, and in pairs. Similarly, semicircular gripping portions 32a1 and groove gripping portions 32g are provided for the portion 22a and the groove gripping portion 22g.

Note that the pair of clamping parts in the upper and lower sub-frames 22 and 32 are provided in areas that avoid joining parts with other elements that are clamped by both of them, and are used for welding work, etc. between component elements. Care has been taken to ensure that it does not become a hindrance.

Next, each clamping portion in the sub-frame 22.33 is machined to be larger than the outer periphery and outer shape of the component element.

In these clamping parts, for example, fluid uncured fluid is applied along the clamping surfaces of the clamping parts 228 and 220 shown in FIG. The master structure loaded with the resin material 4 and assembled with tolerances for expected welding distortion is held between the upper and lower formworks 20 and 30, and the resin material 4 is in an uncured state.
It is pressed onto the top, molded to follow the outline of the master structure, and then completely cured.

That is, - As an example, in FIG. 4, X+ in FIG. 2 of the component element 1a is
It is a sectional view taken along the -X+ line, and FIG. 5 is a part element 1d.
, 1e along line X2-X2, showing component elements 1a and 1d in concave clamping molds 4a and 4a formed based on the master structure.

1e is fitted and positioned, and the upper and lower holding parts 22a
, 32a group, 226.32d group, and the like.

Also, FIG. 6 shows a modification of the mode of molding a seven-flange-shaped part element, 1f or 1g concave clamping mold 4a, and as in the embodiment of FIG. Concave groove holding parts 22f and 32 that directly hold 1f and 1g
For example, in order to position the flange surface while avoiding the welded circumferential part W of the component element 1f with the component element 1C without providing the component element 1C, an auxiliary jig plate 5 is attached to the flange-shaped component element 1f with screw bolts 6. and the jig plate 5 in this state is inserted into the clamping part 2 through the upper and lower concave clamping molds 4a, 4a.
The positioning means is clamped by the 2f and 32f sets. The case shown in FIG. 7 is also a modified form.

In both the embodiments and modifications described above, the concave clamping molds 4a are formed in all of the clamping parts corresponding to the component elements 18 to 1g, but the positioning of each component element 18 to 1g is Depending on the tolerance of accuracy, there may be cases where it is not necessary to provide the concave clamping mold 4a depending on the clamping part.
Furthermore, for the same reason, the concave clamping mold 4a may be provided only in either the upper or lower clamping part.

Next, as shown in FIG. 1, positioning pieces 21a and 31a are provided in pairs at corresponding locations on the opposing joint surfaces of the main frame 21.31 of the formwork 20.30, and
0.30 to have a predetermined overlapping thickness when they are joined together. In addition, in order to prevent the formworks 20 and 30 from shifting in the horizontal direction, engaging pins 7 and locking holes (not shown) are provided on one side and the other side so that they can be engaged when joining. . Furthermore, in order to maintain strong connection between the formworks 20 and 30, connecting members such as trouble clamps 8 are provided at several important points. The coupling member is not limited to the engagement pin 7 and the trouble clamp 8.

With the formwork 20.30 thus obtained, the component element 1
8 to 1g each are arranged, for example, in a predetermined concave clamping mold 4a in the subframe 22 of the mold 2o which is used as the lower mold, and then the upper mold 30 is superimposed on the mold 20 and the engaging bins 7 and When both formworks are connected by the trouble clamp 8, each of the positioned component elements 18 to 1g is held firmly and rigidly by being clamped from both sides.

On the other hand, as shown in FIGS. 8 and 9, the formwork 40 and 50, which form a composite type holder using separate cage-shaped holders C+ and Cz, has a structure in which the workpiece 10 is complex and large in volume. In such cases, the plate is divided into multiple parts to make a separate temporary assembly in consideration of ease of assembly work, and then the two plate assemblies are connected to form a single structure. Ru.

That is, the work 10 divided into the work 10a and the work 10B is temporarily assembled and held separately by the formwork 40.50, and in this state, the formwork 40.50 is assembled together. are assembled as a single structure when joined together. However, from the beginning, the formwork was 40.50
It is also possible to temporarily assemble each of the works 10A and 10B in a state where they are joined and integrated, and then take out the work 10 from the formwork 40, 50 when all the connections have been completed.

Each formwork 40.50 has a main frame body 41.51
and a lid body 42.52 which is removable from the main body, and a main body 41. It is constituted by subframes 43 and 53 mounted on both the si and the lids 42 and 52.

Opposite ends of the main frame body 41.51 are made into joint ends 41a, 51a, and one of these joint ends 5
1a is provided with several joint pins 54 protruding, and corresponding joint holes 44 are bored in the other joint end 41a, and the joint pins 54 and the joint holes 44 that correspond to the tail are attached to each other. It engages when joining the formwork 40.50.

Further, the joint ends 41a and 51a are provided with a pair of buckle-shaped latches that can be locked or released with one touch, for example, in order to maintain the joint state of the molds 40 and 50 that engage the joint bin 54 and the joint hole 44. A hook 45 and a latching pin 55 are provided.

The lid body 42.52, which can be disassembled from the main frame body 41.51, was disassembled in this way to facilitate workability during assembly, and the lid body 42.52 is disassembled from the main frame body 41.51.
It is coupled with the set screw 46 (56) or other means.

In addition, like the structure of the workpiece 1 and formwork 20.30 in FIG. 1, the component element 1 provided on the subframe 22.32
Each clamping part of 8 to 1g and a similar type to the concave clamping mold 4a are also used in the subframe 43.53 to hold the workpieces 10A and 1.
Although they are provided at positions corresponding to each component element of 0B, their explanation will be omitted. However, in FIG. 10, for example, a trouble clamp 11 is shown that is provided on the subframe 53 and clamps one of the component elements on the workpiece IOB side.

Next, as an example, a device for assembling the component elements by welding, using a cage-shaped holder C' similar to the above-mentioned cage-shaped holder C, and holding another work 12 similar to the work 1, will be described. This will be explained using Figure 11.

A conveyance means is constituted by a workpiece carry-in conveyor 60 such as a roller conveyor, a carry-out conveyor 61, and a transfer conveyor 62 interposed between these two conveyors 60 and 61. In the feeding direction of the workpiece 12 indicated by the arrow X, that is, the feeding direction of the cage-shaped holder C', the front end of the carry-in conveyor 60 protrudes and retreats to block or release the conveying path by the operation of the cylinder member 64, and the cage-shaped holder C' A first stopper 63 is provided against which the holder C' abuts and is stopped. A detector 70A, such as a photosensor, is installed near the first stopper 63 to detect the presence or absence of the cage-shaped holder C'. That is, the detection bin 6, such as a bolt, on the detection plate 65 attached to the cage-shaped holder C'
The detector 70A detects the size, number, or arrangement shape of 6.
is detected, and based on this signal, an operation command corresponding to the type of workpiece 12 is sent from a control circuit (not shown).

Next, the transfer conveyor 62 is movable up and down to be connected to or separated from the conveyance path surface of the carry-in/out conveyor 60, 61, receives the cage-shaped holder C' holding the workpiece 12 from the carry-in conveyor 60, and this holder C' When the holder is gripped by the holder gripping means described below, it operates downward from the upper limit position. Further, a second stopper 68 is installed at the front end of the transfer conveyor 62 so that the cage-shaped holder C' that has been sent abuts and stops and is positioned at that position. The second stopper 68 protrudes and retreats to block or release the conveyance path by actuation of the cylinder member 69. Further, a detector 70B such as a photosensor is provided near the second stopper 68 to detect the presence or absence of the cage-shaped holder C'. That is, the detector 70B detects the state in which the cage-shaped holder C' is positioned at a predetermined position, and this detection signal is controlled by the control device to control the gripping means for the cage-shaped holder C' described below. The chuck (grip member 71) is activated.

Next, in parallel to the transfer conveyor 62,
Rotation II of the large-diameter ring forming the gripping mechanism together with the chuck member 71! ! 72 are provided.

This rotary disk 72 is rotatably supported at several points on the outer circumference by guide rollers 73, and rotates in a vertical plane parallel to the workpiece feeding direction X by the operation of a drive motor 74 constituting a positioning mechanism. In addition, the inner diameter 1 and area of the rotary disk 72 are larger than the maximum projected area of the work 12 held by the cage-shaped holder C', and the rotary disk 7 covers the entire area of the work 12 which is a temporary assembly.
Assembling work, here welding work, can be done from both sides of 2.

Here, a chuck member 71 is attached to the side surface of the rotary disk 72 for gripping and holding the holder C' by an oil pressure cylinder type or an electric type, and the holder C' is gripped via the end arm plate 71a. The structure is such that C' is rotated integrally with the rotary disk 72.

On the other hand, a pair of work heads 75, 75 such as robots are installed so that they can face each other from both sides of the rotation M72, that is, from both sides of the vertical plane including the rotary disk 72, and can approach and separate from each other. However, the work head 75.75 is not limited to those intended for welding work; for example, if component elements are mainly connected using bolts and screws, a tightening mechanism called a driver pit etc. may be used. Of course, it is also possible to replace it with a robot equipped with it.

In addition, in the work head 75.75, the cage-shaped holder C
As the rotation of the rotary disk 72, which holds the position 1, begins to rotate, welding is simultaneously performed from both sides of the rotating workpiece 12 within a predetermined period of time in response to an operation command from the control circuit. A detailed explanation of the structure of the working head 75 will be omitted.

Next, a manner of assembling component elements using the cage-shaped holder and device of the above-described embodiment will be explained.

When the control device circuit is powered on, the loading conveyor 6
In this case, the detector 70A detects the presence or absence of the cage-shaped holder C' positioned by the first stopper 63 at 0, in the detection bin 66 on the detection plate 65. The cylinder member 64 uses a control signal based on this detection signal as an operation command.
Then, the first stopper 63 is released from restricting the holding tool C'. At this time, the carry-in conveyor 60 is operated to send out the holder C'.

Next, the cage-shaped holder C' is transferred to the transfer conveyor 62, which is waiting at the same level as the carry-in and carry-out conveyors 60, 61, and is positioned by hitting the second stopper 68. The presence or absence of the holder C' at this position is detected by the detector 70B, and this signal activates the gripping arm plate 71a to grip the cage-shaped holder C' and position it at the center of the rotary disk 72.

When the cage-shaped holder C' is gripped by the chuck member 71, the transfer conveyor 62 moves downward to a standby position where it does not interfere with the rotation of the holder C'.

When a detection means such as a limit switch detects that the transfer conveyor 62 has reached the standby position, an output signal obtained by controlling this detection signal causes the work heads 75, 75 to approach the workpiece 12 from both sides to a predetermined position.

In close proximity to the working head 75, a detection bin 66 on the detection plate 65 as described above is connected to a detector 70.
When A is detected, a control signal based on the type of workpiece 12 programmed in advance is sent, and this controlled output signal causes the welding torch 75a shown in FIG.
, 75a move toward the joining point on the workpiece 12, which is the first work target. Next, welding torch 75
a.

Welding is performed from both sides of the work 12 by means of the weld 75a.

In synchronization with the start of welding work by the welding torches 75a, 75a, an actuation signal is sent to the drive motor 74 to rotate the workpiece 12 in the clockwise direction, for example in the direction of the arrow, and the drive of the motor 74 causes the rotary disk to rotate. 72 is selectively rotated and positioned to a predetermined rotational position.

That is, - the rotary disk 72 is rotated according to a program based on welding conditions for welding the joints between several component elements in the workpiece 12, and the welding torch 75a of one work head 75 welds the joints in a semicircular manner. It is controlled so that it rotates to the angular position where it finishes sharing the amount. Moreover, a welding torch 75a.

Each of the welds 75a can be welded downward to the welding surface of the joint.

In this way, all the welding connections between component elements in the workpiece 12 are performed while the rotation angle positioning of the rotation 172 and the movement of the work head 75 satisfy various welding conditions.

When the assembly of the workpiece 11 by welding is completed, the cage-shaped holder C' stops in its original position, and the pair of work heads 75.7
5 retreat from each other and return to their original positions. Next, the transfer conveyor 62 in the lower standby position moves upward to the upper limit position and returns to support and carry the holding holder C from below.

Next, the cage-shaped holder C' is released from being gripped by the chuck mechanism 71. At this time, the second stopper 68 has already retreated from the conveyance path surface by the operation of the cylinder member 69 and returned to the position where the stopper was released.

In this state, the work 12 assembled as a single structure is carried out by the carry-out conveyor 61 together with the cage-shaped holder C', and then the work 12 is removed from the cage-shaped holder C'.
is taken out. That is, the wire 12 is a cage-shaped holder, C
Since the entire circumference of each joint is welded while rigidly held by C', there is almost no risk of welding distortion such as warping even if it is immediately removed from the cage-shaped holder C'.

Effects of the Invention As can be understood from the above, according to the method for welding and assembling components of the present invention, each of a plurality of component elements is rigidly held in a temporarily assembled state by an integrated cage-shaped holder. After the cage-shaped holder is rotated to the selected rotation angle position and positioned, or while the cage-shaped holder is rotated to the selected rotation angle position, a pair of welding heads are applied to the same part of the temporary assembly from both sides. Since welding is carried out in close proximity at the same time, the welding torch in the welding work head can always take a suitable position with respect to the joining part, such as downward welding, which results in welding that yields a bead of improved quality. It becomes possible. In addition, by simultaneously welding from both sides of the joining part, welding distortions such as warpage can be balanced, thereby efficiently producing a single structure in which the occurrence of welding distortion is suppressed as much as possible.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a mode in which a workpiece is held as a temporary assembly by a cage-shaped holder, Fig. 2 is a plan view thereof, Fig. 3 is a perspective view of a mode in which cured resin is loaded in the clamping part, and Fig. 4 is a perspective view of a mode in which a workpiece is held as a temporary assembly by a cage-shaped holder. Vertical sectional view of the concave clamping type taken along the line X+-X+ in Figure 2, No. 5
The figure is a vertical sectional view of the concave clamping type taken along the line X2-x2 in Figure 2, FIGS. 6 and 7 are longitudinal sectional views of a modification of the concave clamping type for a part element having a flange, 9 and 9 are an exploded perspective view and an assembled perspective view of a mode in which divided workpieces are held separately as temporary assemblies by a cage-shaped holder, and FIG. 10 is a mode in which a trouble clamp is used as a clamping tool for component elements. A perspective view of. Fig. 11 is a perspective view of a device for assembling workpieces held in cage-shaped holders according to the application, and Fig. 12 is an example of a mode in which a welding torch is attached to the work head to weld the workpieces from both sides. FIG. Explanation of symbols of main parts 1.10.12... Temporary assembly work 4a...
...Concave clamping type made of cured resin 8.11...
Trouble clamp 20.30 (40,50) ・・・・・・Formwork (frame) that forms the cage-shaped holder
71...Chuck mechanism 72...Turnable disc 75...Work head X...Work feed direction Applicant Honda Motor Co., Ltd. Agent Patent attorney Motohiko Fujimura Figure 8 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] A temporary assembly made by combining a plurality of component elements with each other is held by an integrated cage-shaped holder, the cage-shaped holder is selectively positioned at a plurality of positions within a predetermined vertical plane, and the A method for welding and assembling parts and elements, characterized in that welding is performed by simultaneously bringing a pair of welding heads close to the same portion of the temporary assembly from outside the cage-shaped holder on both sides of a predetermined vertical plane.