JPH0448893Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a parallel production jig with a high degree of freedom for mixed production of various products on a processing line such as car body assembly.

[Conventional technology]

Conventional parallel production methods include, for example,
There is something like the one shown in Figure 7. 1 is an automobile body assembly line, S1 to S7 represent processing stages where assembly work such as welding is performed, the A stage has jigs dedicated to the A car type, and the B stage has specifications, models, etc.
A jig is provided specifically for the B vehicle type, which has different standards.

In the one shown in Fig. 6, machining stages S1, S3, S5, S7 exclusively for car A and machining stages S2, S4, S6 exclusively for car B are arranged alternately. 2 pitch feed P _A and
This is the most common parallel production method, in which cars A and B of different models are produced in parallel on a common line while the workpiece is transported by P _B.

On the other hand, the one shown in Fig. 7 is of a jig exchange type (for example, see Japanese Patent Application Laid-open No. 100879/1983).
Each processing stage S1 arranged along line 1
~S4 consists of a multi-spot welding machine. Each of the multi-spot welding machines has an assembly jig that positions and holds the members to be assembled that make up the vehicle body, and a fixture that includes a welder that simultaneously spot-welds the positioned members at a plurality of points. These fixtures are interchangeably provided, with fixtures A dedicated to vehicle A and B dedicated to vehicle B, and can be automatically replaced in a short time depending on the vehicle type of the work to be transported. , which performs parallel production.

[Problem that the invention attempts to solve]

However, in the case of such a parallel production system using conventional jigs, the one shown in Figure 6 is one in which the process is fixed in advance at the initial line installation stage and the conveyance device is set to two-pitch feed. On the other hand, the one shown in FIG. 7 uses extremely large-scale equipment such as a fixture exchange mechanism. Therefore, (1) In the case shown in Fig. 6, it is necessary to switch the feed according to the A and B cars.

(2) The equipment shown in Figure 7 is large-scale and expensive, and is difficult to adapt to different vehicle types.

There was a problem.

This idea was created by focusing on these conventional problems.A compact lifter is installed on the jig of a dedicated stage, and when a workpiece of a different car type is placed on the stage, the workpiece can be transferred to the lifter. The purpose of the present invention is to solve the above-mentioned problems by raising and retracting the machine and not performing machining.

[Means for solving problems]

This invention, which achieves the above objectives, is a jig used in the processing stage of parallel production in which different vehicle types are mixed and conveyed and processed on a common body assembly line, and welding and assembly must be performed at each processing stage. It is equipped with an assembly jig means for holding the workpiece of a dedicated car model at a processing work level, and for the input workpiece of a different car model, it is set to a pass level higher than the processing work level so that no assembly work is performed. We have provided a jig for parallel production that is equipped with a pass lifter that is equipped with a workpiece shape receiver for different car models to be held.

[Effect]

The pass lifter of the jig for parallel production according to this invention holds different kinds of workpieces among the workpieces conveyed to the stage having the jig at a position elevated above the workpiece processing level. As a result, processing of different types of workpieces is postponed, and while the same type of workpieces are transported sequentially in the next conveyance, the same type of workpieces are held at the processing level on the jig and predetermined processing is performed. By sequentially feeding the plurality of randomly arranged machining stages one pitch at a time, parallel production of multiple vehicle models on a common line can be freely realized.

〔Example〕

This invention will be explained below based on the drawings.

1 to 5 are diagrams showing an embodiment of this invention.

FIG. 1 shows a parallel production line for welding and assembling automobile floors, which consists of a plurality of processing stages S1 to S8 for welding and assembling. Stage S1 and stage S3 at the upstream end are dedicated to vehicle A and vehicle B, respectively.
A front floor F equipped with a car-specific assembly jig means 2 and transported separately from a sub-line not shown;
The engine compartment E and the rear floor R are positioned relative to each other and held on the assembly jig means 2.
Also, stage S2 and stage S4 are each A
It has a multi-spot welding machine 3 dedicated to cars and car B, and partially spot-welds the front floor F, engine compartment E, and rear floor R, which are assembled and transported using the assembly jig means 2, to temporarily weld them. Join. Downstream processing stages S5, S6, S
7, S8 each have a plurality of welding robots R.
5, R6, R7, and R8 are installed, and the robot welding gun 4 is used to weld upstream stages S3, S4.
Perform additional welding on welding points that were not welded. In this case, the welding robots R5 and R7 have been taught the extra welding program for car A, and the welding robots R6 and R8 have been taught the extra welding program for car B.

Reference numeral 5 denotes a shuttle bar as a known conveying means that extends along the line, and is driven by a reciprocating means (not shown) to repeat horizontal reciprocating motion of one pitch in the line direction, thereby transporting the workpiece downstream one pitch at a time. It is now being sent intermittently towards the

The assembly jig means 2 is mounted on the floor as shown in FIG.
It has a frame 6 installed on the FL, and the shuttle bar 5 is movably supported at the upper end of this frame 6. A pair of vertical balance cylinders 7 are attached to the frame 6, and a lifting platform 8 is fixed to the tips of piston rods 7a of these balance cylinders 7. Reference numeral 9 denotes a vertical drive cylinder attached to the frame 6. The elevating table 8 is fixed to the tip of the piston rod 9a of the driving cylinder 9, and the elevating table 8 is moved up and down by the actuation of the drive cylinder 9. On the lifting platform 8,
A jig member 10 for positioning and holding the engine compartment E, a jig member 11 for positioning and holding the front floor F, and a jig member 12 for positioning and holding the rear floor R are attached. jig member 10,1
1 and 12, the engine compartment E, the front floor F, and the rear floor R are positioned and held in such a state that the front and rear ends of the front floor F overlap with the rear end of the engine compartment E and the front end of the rear floor R. Jig member 10,1
The shapes of stages 1 and 12 in stage S1 dedicated to car A are naturally different from those in stage S3 dedicated to car B. 13 is assembly jig means 2
This is a path lifter consisting of a plurality of general-purpose air cylinders that are vertically attached to a lifting platform 8, and each of the plurality of cylinders is arranged to be able to operate independently according to the shape of the workpiece, and the output rod 13 of each path lifter 13
A workpiece shape receiver 14 is fixed to the tip of a. The shapes of these shape receivers 14 are those for car B in the case of stage S1 exclusively for car A;
The car-specific stage S3 is designed for car A.

The multi-spot welding machine 3 is shown in FIGS.
As shown in the figure, it has a base frame 17 placed on the floor FL, and the shuttle bar 5 is movably supported by support arms 16 extending from a frame 15 erected on the frame 17. Welding jig means 3 is mounted on the base frame 17 as an assembly jig means.
As in the above, a pair of balance cylinders 7 and a driving cylinder 9 for raising and lowering are attached, and the raising and lowering platform 8 is raised and lowered. The lift table 8 is provided with a back electrode 18 for pressurizing and energizing the workpiece from the back side, and a pass lifter 13 that can be operated independently.
A workpiece shape receiver 14 is fixed to the tip of a.

For the stage S2 exclusively for car A, the shape of the back electrode 18 is formed to match the car A, the shape of the workpiece shape receiver 14 is formed to match the car B, and for the stage S4 exclusively for car B. The shape of the back electrode 18 is formed to match the B car, while the shape of the workpiece shape receiver 14 is formed to match the A car.

19 is a multi-spot welding electrode, and a fluid pressure cylinder 21 disposed on the upper frame 20
It is disposed on the lower surface side of the upper electrode stand 22, which is driven to be able to rise and fall freely, in accordance with the shape of the workpiece. Note that 23 is a finger provided on the shuttle bar 5 supported by the support arm 16 via a guide roller 24 so as to be movable back and forth.

In the stages S5 to S8, as shown in FIG. 2, a robot welding jig means 26 is provided as an assembly jig means on a frame 25 installed on the floor FL for robot welding. A shuttle bar 5 is movably supported on the frame 25, and a pair of balance cylinders 7 and a driving cylinder 9 for raising and lowering are attached to the frame 25, and a lifting platform 8 is supported so as to be movable. On this elevating table 8, along with a jig member 27 that supports the lower surface of the workpiece W, path lifters 13 consisting of a plurality of general-purpose air cylinders are arranged so as to be able to operate independently. 14 is fixed.

In the case of stages S5 and S7 exclusively for A cars, the shape of the jig member 27 is formed to match the A car, and the shape of the workpiece shape receiver 14 is formed to match the B car. On the other hand, in the stages S6 and S8 exclusively for B cars, the shape of the jig member 27 is formed to match the B car, and the shape of the workpiece shape receiver 14 is formed to match the A car.

Next, the effect will be explained.

From the upstream side of the line, the workpiece W is
The main floor W A of car _A and the main floor W B of car _B are randomly input in sequence.

The operation at each stage will be described below, represented by stages S3, S4, and S5 shown in FIG. In Fig. 2, a workpiece W _B is now put into stage S3, which has assembly jig means 2 exclusively for car B.
A state is shown in which a workpiece W _A is put into stage S4, which has a multi-spot welding machine 3 dedicated to car B, and a different type of workpiece W _B is put into stage S5, which has a welding robot R5 dedicated to car A. I'm being ignored.

Each workpiece is supported by the fingers 23 and transported from the previous stage by one-pitch horizontal forward movement of the shuttle bar 5. At this time, each stage S1 to S8 receives a vehicle type information signal for the workpiece W to be thrown. is sent from an upper line control device (not shown). Based on the signal, at the stage where a workpiece of a different car type is to be inputted (for example, stages S4 and S5 in the case of FIG. 2), the path lifter 13 is operated in advance and the output rod 13a is
By protruding, the different car model workpiece shape receiver 14 is lifted to its upper limit. This lift operation does not require consideration such as linking each path lifter 13 with a connecting arm or the like so that each path lifter 13 operates at the same timing as described above, and therefore, the path lifter 13
can be installed in a small space. When the workpiece W on the shuttle bar 5 is stopped at a predetermined position of each processing stage, the vertical drive cylinder 9 of the lifting table is activated to project its output rod 9a, and the lifting table 8 is raised. During the ascent of this ascending platform 8, the finger 2 of the shuttle bar 5
The work W held on 3 is transferred to the jig. In other words, assembly stage S exclusively for car B
3, as shown in detail in FIG. 4, the workpiece W _B (dotted chain line) on the finger 23 at the transport level L1 is transferred to the jig members 10, 11, and 12, and then moved to the lifting platform. The work is stopped at the machining work level L2 of the workpiece W _B , which is the upper limit of 8, and the work is performed. On the other hand, in the case of the multi-welding stage S4 exclusively for vehicle B, as shown in FIG. 3, different types of workpieces W _A are supported by the shuttle bar finger 23 and are located at the transport level L1. As the lifting platform 8 rises, the workpiece W _A is transferred to the workpiece-shaped receiver 14 exclusively for vehicle A at the end of the protruding output rod 13a of the path lifter 13. When the lifting platform 8 reaches its upper limit,
The work W _B is held at the pass level L3, which exceeds the work level L2. When the same type of car B workpiece W _B is put into this multi-welding stage S4 exclusively for car B, the workpiece W _B is transferred onto the back electrode 18 for car B when the lifting platform 8 is raised and held at the working level L2. After that, the multi-spot welding electrode 19, which has descended together with the upper electrode stand 22, is pressed by the operation of the fluid pressure cylinder 21, and multi-spot welding is performed. However, in the case of the work W _A of a different type of car A that has been evacuated to the pass level L3, the upper electrode stand 22 is not lowered, and therefore the welding work is not performed and the work is passed. By supporting at the pass level L3, it is possible to prevent problems such as interference between the workpiece W _A of car A and the back electrode 18 exclusively for car B, resulting in misalignment or damage.

In the case of the robot welding stage S5 exclusively for vehicle _A , as shown in FIG. The pass level L is transferred to the workpiece shape receiver 14 for car B and exceeds the work level L2.
3 is reached and held. The work W _B evacuated to this pass level is passed without being subjected to additional spot welding by the welding gun 4 of the welding robot R5.

[Effect of idea]

As explained above, according to this idea,
The workpiece support jig in the parallel production line is equipped with a pass lifter that holds the workpiece of a different car type higher than the processing level when the workpiece of a different car type is input, so that the following effects can be obtained.

(1) Models A and B can be machined with one pitch feed, and there is no need to switch the feed.

(2) Easily adapts to changes in vehicle models after setting the line.

(3) Simple equipment is sufficient, reducing equipment costs.

[Brief explanation of drawings]

Fig. 1 is a schematic plan view of a car body assembly line to which an embodiment of this invention is applied, and Fig. 2 is the same as Fig. 1.
The arrow view, Figure 3 is the - arrow view of Figure 2, Figure 4.
The figure is a - arrow view in Figure 2, and Figure 5 is a V in Figure 2.
-V arrow view, FIG. 6 is a schematic diagram showing an example of an assembly line using a conventional jig, and FIG. 7 is a schematic diagram showing another example of an assembly line using a conventional jig. 1...Vehicle body assembly line, 2, 3a, 26...Assembling jig means, 13...Pass lifter, S1 to S8...
...Machining stage, L2...Machining work level, W _A ,
W _B ...Work, 14...Work shape receiver, L3
...pass level.

Claims (1)

[Scope of utility model registration request] This is a jig used in the processing stage of parallel production in which different car models are mixed and conveyed and processed on a common car body assembly line, and each processing stage has a workpiece of a dedicated car model to be welded and assembled at the processing work level. The present invention is equipped with an assembly jig means for holding a workpiece of a different car type, and a workpiece shape receiver of a different car type for holding a workpiece of a different car type input at a pass level higher than the processing work level for not performing assembly work. A parallel production jig characterized by being equipped with a pass lifter.