JPH0671908B2 - Manufacturing method of automobile body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] <Field of Industrial Application> The present invention relates to a method for manufacturing an automobile body.

<Prior Art> Conventionally, a body of an automobile is constructed by assembling a large number of metal members, which are mainly steel plates, as parts such as a main body, a door and a bonnet by spot welding and assembling them. Also, in the mating portion of the metal members,
A sealing material is applied to ensure water tightness for dust prevention and rust prevention.

As a method for applying the sealing material, for example, according to JP-A-63-25184 by the same applicant, a sealing step is provided before assembling the metal members such as the main body, door and bonnet manufactured by the welding step. A method has been proposed in which a device for opening and closing a door, a hood, and the like is unnecessary when performing a sealing operation, so that the facility cost can be reduced.

However, even in the above method, since the welding work and the sealing material application work are performed in different work stations, there is a disadvantage that the total length of the assembly line becomes long. Also,
In order to perform the welding work and the coating work automatically, for example, it is necessary to accurately position the main body. Therefore, each work station is equipped with a positioning device so that the main body positioning work can be performed for each work process. There is a problem that the work becomes complicated because it must be performed.

<Problems to be Solved by the Invention> In view of the problems of the prior art as described above, a main object of the present invention is to provide a method for manufacturing a body of an automobile capable of improving work efficiency.

[Configuration of the Invention] <Means for Solving the Problems> According to the present invention, the object is to weld the metal members constituting the metal member of the automobile body to each other, and the metal component of the automobile body. In the method of manufacturing an automobile body, wherein the step of applying a viscous coating material to the joining portion of the metal members constituting the above is performed at the same work station, in the welding step, a welding robot provided below or to the side of the body. The welding is performed on the lower part of the body by means of the above, and in the coating step, the coating is performed by causing a coating robot provided above the body to enter the vehicle interior through the opening of the body. It is achieved by providing a manufacturing method of. Alternatively, in an apparatus for manufacturing an automobile body, a welding device for welding the metal members forming the metal parts of the automobile body to each other and a viscous material at the joint between the metal members forming the metal parts of the automobile body are used. A coating device for coating a coating material, the coating device and the welding device are provided in the same working station To be done.

<Operation> As described above, since the welding work and the viscous material application work are performed at the same work station, it is not necessary to position the metal member separately for each work, and a transfer process is provided between both work processes. No need.

<Embodiment> Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are a front view and a plan view showing a work station 1 for performing welding work and viscous material application work according to the present invention, and FIG. 3 is an arrow III- of an arrow in FIG. I
It is the figure seen from the II line. For example, the main body 2 as a metal component forming the body of the automobile is shown in FIGS.
By the shuttle conveyor 3 as a transfer device extending along the left-right direction of the drawing, the work station 1 is operated from the right side of the drawing.
After completion of the welding work and the viscous material application work for the necessary parts, the work station 1 is carried out to the left in the drawing.

On the upper surface of the shuttle conveyor 3, there is integrally provided a receiving portion 3a for supporting the main body 2 when the main body 2 is transported between the work stations 1. The tip of the receiving portion 3a is the lower surface of the main body 2. The main body 2 is positioned with respect to the shuttle conveyor 3 by abutting on a specific part of the. The shuttle conveyor 3 is supported by a parallel rail 4 so as to be capable of reciprocating in the carrying direction, and is driven by a drive device (not shown).
After completion of the work, the main body in each station is conveyed to the next station, and the positioning device 5 described later is used.
The main body 2 is floated from the shuttle conveyor 3 and supported by another supporting device such as the above, and thereafter, the main body 2 is reversely divided by the pitch. In this way, the main body 2 is carried in and out of the work station 1.

A positioning device 5 is disposed below the work station 1. As shown in FIGS. 1 and 3, the positioning device 5 includes a pair of X-shaped links 6 that are parallel to each other.
And a movable support member 8 provided at the free ends of both X-shaped links 6 is driven by an air cylinder 7 that drives a pivotally supporting member that pivotally supports each intersection of both X-shaped links 6 at both ends. It is to raise and lower while keeping it horizontal. Positioning support portions 9 are integrally provided at four corners on the upper surface of the movable table 8,
By lifting up the movable table 8, the positioning support portion 9 is engaged with a specific portion of the lower surface of the main body 2 carried in by the shuttle conveyor 3, and the main body 2 is floated from the shuttle conveyor 3 as described above. And the positioning at the work station 1.

A platform 11a, 11b forming a gate shape in the width direction is arranged above the work station 1, and a horizontal beam of each platform 11a, 11b has a multi-joint structure having the same structure as a coating robot. Two robots 12a to 12d are supported in a so-called ceiling suspension state, and are arranged symmetrically to each other. A nozzle 14 is provided at the tip of the bending arm 13 of each of the robots 12a to 12d so that the nozzle 14 faces the main body 2 from above.

Further, on the gantry 11a, 11b, a constant discharge pump 15 with a heater is arranged corresponding to each of the robots 12a to 12d.
The pump 14 and the pump 15 are connected via a conduit with a heater (not shown). The viscous coating material sent from a viscous coating material supply device (not shown) arranged near the work station 1 is supplied to the tip of the nozzle 14 via a constant discharge pump 15 with a heater. As the viscous coating material, for example, one that is excellent in oil surface fixability, shower resistance, film forming resistance, and coating finish, and that has the lowest viscosity at around 50 ° C is used. good.

Each of the robots 12a to 12d has an engine room, a trunk room,
It has been taught in advance how to apply the viscous coating material to the required parts of each metal member mating part in the vehicle interior, and the application work is continuously and automatically applied to the respective parts. Further, the viscous coating material is heated to some extent and discharged from the nozzle 14 while maintaining a relatively low viscosity state, and the moving speed of the nozzle 14 is slowed to a portion where there is a relatively large gap between the metal-bonding portions to cause coking. By performing the work and performing the sealing work while moving the other parts at a relatively high moving speed, one robot can perform the caulking and the sealing work according to the target site.

On both sides below the work station 1, the main body 2
Welding robots 16a to 16d are installed at four locations corresponding to the front, rear, left, and right of the
Are provided one by one. These robots 16a-16d
Is a multi-joint robot having the same structure as the coating robots 12a to 12d described above, and has a pair of electrode portions 18 at the tip of a bending / extending arm 17, and a metal mainly at the bottom of the main body 2. Spot weld the mating part. In addition, similarly, the welding work for the necessary parts is taught in advance, and the welding work is continuously and automatically performed for each of the respective parts.

Next, the operating procedure is shown below.

When the detector (not shown) detects that the main body 2 has been loaded into the work station 1 by the shuttle conveyor 3, the positioning device 5 in the standby state at the lower limit position is lifted up as shown in the figure and Support part 9
The main body 2 supported by is suspended and positioned while being lifted from the shuttle conveyor 3. Next, by outputting the positioning detection signal of the main body 2,
As described above, the coating robots 12a to 12d enter the vehicle compartment through the engine compartment, the trunk compartment, and the front and rear openings of the main body 2 as shown in the drawing, and the viscous coating material is applied to a necessary portion of each metal member mating portion. The welding robots 16a to 16d similarly perform the work by spot welding mainly to the necessary parts below the main body 2.

The positioning device 5 is lifted down by the output of the end signal of both works, and the main body 2 is again supported by the receiving portion 3a of the shuttle conveyor 3 in the standby state by running backward by one station during the work. Then, the main body 2 that has completed the welding and coating work is carried out by the shuttle conveyor 3 toward the next station on the left side of the drawing, and the next work image is transferred from the front station on the right side of the drawing. The main body is loaded and the sequence is repeated thereafter.

In this way, the welding robots 16a to 16d arranged below the work station 1 mainly perform spot welding on a necessary portion below the main body 2 and the robots 12a to 12d arranged above the work station 1. As a result, it is possible to perform a coating operation as a sealing and caulking operation on a required portion of each metal member mating portion in the engine room, the trunk room, and the vehicle room of the main body 2.

In the present embodiment, the welding and coating operations for the main body 2 have been described, but any metal component forming the body of the automobile may be used, and the same can be done for doors and bonnets, for example. Further, the welding and the coating work may be performed at the same time, or the coating work may be performed on the metal member mating portion welded at the same work station.

As described above, according to the present invention, since the welding process and the viscous coating material applying process are performed at the same work station, both processes can be performed only by performing the positioning work of the metal parts forming the body of the automobile. In addition, since it is not necessary to provide a step of conveying the main body between both steps, the work efficiency can be improved. Further, since the number of positioning devices can be reduced and the total length of the line can be shortened, the effect of the equipment cost can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a front view showing a work station according to the present invention. FIG. 2 is a plan view showing a work station according to the present invention. FIG. 3 is a view taken along the line III-III in FIG. 1 …… Work station, 2 …… Main body 3 …… Shuttle conveyor, 3a …… Receiving part 4 …… Rail, 5 …… Positioning device 6 …… Link, 7 …… Air cylinder 8 …… Movable platform, 9 …… Supporting parts 11a, 11b ... Stand, 12a-12d ... Robot 13 ... Arm, 14 ... Nozzle 15 ... Pump 16a-16d ... Welding robot 17 ... Arm, 18 ... Electrode part

Claims (1)

[Claims] 1. A step of welding metal members forming a metal part of a body of an automobile to each other and a step of applying a viscous coating material to a joint portion of metal members of an automobile body are performed at the same work station. In the method of manufacturing an automobile body, in the welding step, a lower part of the body is welded by a welding robot provided below or on the side of the body, and in the applying step, the welding is performed above the body. A method of manufacturing a body of an automobile, wherein coating is performed by injecting a coating robot into a vehicle compartment through an opening of the body.