JPH04749B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for assembling a motorcycle body by welding a plurality of center members such as head pipes and crossments of the motorcycle body to side frames on both left and right sides of the motorcycle body. .

(Prior Art) Conventionally, as a method of assembling this type of motorcycle body, as seen in Japanese Patent Publication No. 1182-1982, a center jig that holds a center member, and a left and right side frame that holds side frames on each side are used. Using a pair of side jigs, set the side frame in the laid down state on both side jigs, then stand the both side jigs on both sides of the center jig and mount it on each side jig. It is known that each center member and each side frame are welded using a plurality of welding torches.

(Problems to be Solved by the Invention) In the above-mentioned conventional technology, a side frame assembled by welding a plurality of side frame members is set on a side jig, which requires a separate side frame assembly device, and also requires welding. Since it is necessary to prepare multiple complicated and expensive side jigs equipped with torches for each model, the overall equipment cost increases.Furthermore, after the side frame is assembled, the side frame must be removed from the welding jig and used as a side jig. To set
The side frames may become distorted due to welding distortion, and because the welding torch is fixed, it is only possible to perform spot welding between the side frames and the center member, and the lack of welding strength makes it difficult to transfer the vehicle body to another jig. There is a problem in that distortion tends to occur during actual welding.

The present invention provides a method for assembling a motorcycle body that solves the above problems by assembling the side frames and welding the side frames and the center member together in the same process using the same welding robot. is its purpose.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a center jig for holding a plurality of center members such as head pipes and crossments of a two-wheeled vehicle body, and side frames on each side of the left and right sides of the vehicle body. A pair of left and right side jigs that hold a is constructed by attaching a holding member for positioning and holding a plurality of side frame members constituting the side frame to a jig frame made of aggregate, and when each side jig is laid down, each side After setting the side frame members on the jig, the side frame members are welded by a welding robot to assemble the side frame, and then each side jig is erected and the welding robot is used to assemble the side frame members. The present invention is characterized in that the center member and the side frame are welded through the frame space of the frame.

(Function) Assembling the side frame by welding the side frame members together while positioning and holding each side frame member in each holder of each side jig,
The side frames and the center member are welded together, and the center member can be welded to the side frame itself after its welding distortion has been corrected, improving the precision of the vehicle body.

Also, when welding the side frame and center member with the side jig in the upright position, a welding torch attached to the welding robot is inserted from the outside into the framework space of the side jig to weld the side frame and center member. This makes it possible to lengthen the welding length and increase the welding strength during the temporary welding stage, eliminating the need to correct distortion during the main welding process.

(Example) The drawing shows a head pipe W1 as shown in FIG.
a and various cross members Wb1, a main upper frame _W2a , a rear upper frame W2b, and a down tube W2c.
The left and right side frames consist of side frame members such as the rear stay W2d and the bracket We.
An embodiment is shown in which a two-wheeled vehicle body W is assembled by welding W ₂ and W ₂ , and as shown in FIGS. , a main welding station 3, and a payout station 4 are arranged along a track 5 laid between the set station 1 and the joining station 2.
A reciprocating cart 6 is provided between the two, and a center jig 7 having a plurality of holding members 7a for positioning and holding various center members _W1 is mounted on the cart 6. A slide stand 9 is provided on each side, which is moved laterally back and forth by a shift cylinder 9a along rails 8a, 8a on the slide base 8. Each jig holder 10 is supported by a jig holder 10 that can be raised and lowered.
Each side jig 1 to hold the side frame W ₂ on
1 and set the center member W ₁ on the center jig 7 at the set station 1,
This is put into the joining station 2 by moving the cart 6, and then joined from the side to the center jig 7 as described later with each side jig 11 erected, and held by the center jig 7. A side frame W2 held by each of the side jigs 11 is coupled to a center member _W1 , and in this state, a welding robot ₁₂ with a welding torch 12a is placed in front and behind each slide base 8 on both sides of the coupling station 2. ，
12, the center member W ₁ and each side frame W ₂ are welded, and then the tack welded vehicle body W
is transported to the main welding station 3 by a first transport jig ₁₄₁ which is suspended from a transport frame 13 above the assembly line and which can be moved up and down, and delivered to the rotating jig 15 provided at the station 3. 15, while changing the attitude of the vehicle body W, welding robots 16 with welding torches 16a on both sides of the station 3,
16, the main welding is performed, and then the vehicle body W is delivered to the delivery station ₄ by a second transport jig 141 which is suspended from the transport frame 13 and is movable up and down.

As shown in FIGS. 4 and 5, each of the side jigs 11 is a plurality of cylinders 11b1, which are opened and closed by cylinders 11b1 as shown in FIG. 6, which position and hold various side frame members in a jig frame _11a made of aggregate. A lock cylinder 10c is attached to the jig holder 10 to operate an engaging piece 10b that engages with a lock pin 11c protruding from the back surface of the jig frame 11a. 10
As shown in FIG. As shown, a docking pin 11d is attached to each side jig 11, and a docking cylinder 7c that operates an engagement piece 7b that engages with the pin 11d is attached to the center jig 7, and each side jig 11 is erected. In this state, the docking pin 11d is fitted into the center jig 7 from the side by advancing inward in the lateral direction, and is inserted into the engagement groove _11d1 at the tip of the pin 11d by the operation of the docking cylinder 7c. Engage the engaging pieces 7b from the front and back directions to connect each side jig 11 to the center jig 7,
Both jigs 7 and 11 are positioned during welding at the joining station 2.

Each of the jig holders 10 has a pair of front and rear cylinders 1 attached to the slide base 9 at lever portions 10d, 10d vertically disposed at both the front and rear ends of the lower end.
7 and 17, and is raised and lowered as described above by the operation of both cylinders 17 and 17.

Next, the working process on the above assembly line will be explained.

First, set station 1 of center jig 7
Then move the head pipe W1a to the jig 17.
At the same time, set the center member W ₁ such as
The side frame members such as the main upper frame W2a are set on the respective side jigs 11 by retracting them to the laterally outward setting locations 2a by the movement of
1b, each of the side jigs 11 is moved forward to a laterally inward welding location, and the joints between the side frame members on each of the side jigs 11 are welded by the welding robots 12, 12, In the meantime, the center jig 7 is put into the joining station 2.

After completing the assembly of side frame W ₂ by welding the side frame members, each side jig 1
1 and connect it to the center jig 7 from its side.

According to this, the left and right side frames W ₁ and W ₂ face each other across the center member W ₁ held by the center jig 7, and in this state, the welding torch 12a of each welding robot 12 is attached to each side jig. The welding points of the center member W ₁ for each side frame W ₂ are sequentially approached through the frame space of 11,
Weld each weld point to the maximum weld length possible.

Next, the holding member 11b of each side jig 11 is opened, and each side jig 11 is retracted to the setting location 2a by a reverse operation to the above, and each side jig 11 is moved back to the setting location 2a.
At the same time, after transferring the temporarily welded vehicle body W to the first transport jig ₁₄₁ , the center jig 7 is moved to the setting station 1 in double motion to set the center member _W1. The above-described operations are repeated to perform tack welding of the vehicle body W at the joining station 2, and in parallel with this, the final welding is performed at the main welding station 3.

(Effects of the Invention) As described above, according to the present invention, there is no need for a separate assembly device for the side frame, and the side jig can be constructed with a simple and inexpensive structure without a welding torch, reducing equipment costs. In addition, since the side frames are assembled by welding the side frame members while being positioned and held on the side jigs, and the side frames and the center member are welded together, the side frames are prevented from being distorted and the vehicle body is It is possible to assemble the side frame and the center member by a welding robot through the framework space of the jig frame of the side jig, so it is possible to increase the welding strength by increasing the welding length during the temporary attachment stage. There is no need to correct distortion during actual welding,
Moreover, it has the effect of shortening the welding time in the main welding process.

[Brief explanation of drawings]

Fig. 1 is a side view of a car body assembly line used for carrying out the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a front view of the joining station seen from - in Fig. 1 with the welding robot omitted, and Fig. 4 The figure is an enlarged front view of the center jig and side jig, and Figure 5 is the − of Figure 4.
A side view of the side jig seen from the line, Figure 6 is the 5th
FIG. 7 is an enlarged cross-sectional view taken along the line - in FIG. 4, and FIG. 8 is a perspective view of the vehicle body. W...Vehicle body, _W1 ...Center member, _W2 ...
Side frame, 7... Center jig, 11...
Side jig, 11a...Jig frame, 11b...Holding member, 12...Welding robot.

Claims (1)

[Claims] 1 Using a center jig that holds multiple center members such as head pipes and crossments of a two-wheeled vehicle body, and a pair of left and right side jigs that hold side frames on each side of the vehicle body, the two side jigs are In a device that stands up on both sides of the center jig and welds each center member and each side frame, each side jig is a jig frame made of aggregate and a plurality of side frames constituting the side frame. A holding member for positioning and holding the members is attached, and after setting the side frame members on each side jig with each side jig laid down, these side frame members are welded by a welding robot. The side frames are assembled by welding, and then each side jig is erected, and the welding robot welds the center member and the side frame through the framework space of the jig frame of each side jig. Features: How to assemble a motorcycle body.