JPS6210873B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a vehicle body, and in particular to a method for manufacturing a vehicle body that enables simplified assembly by performing press forming and welding simultaneously or alternately. It is.

[Conventional technology]

Conventionally, in order to manufacture a car body, a method has been adopted in which first press working is performed on a steel plate to produce car body parts divided into several parts, which are then assembled and joined together by welding.

The press-molded parts that make up the vehicle body are appropriately divided to facilitate production, and the vehicle body is completed by assembling them. In other words, in conventional production methods, the pressing process and welding process are separated, and approximately
200 press-formed parts are manufactured separately, transported to the assembly process, and assembled by welding.

In this conventional method, not only are the press-formed parts extremely fragmented and the number of parts is extremely large, but the main components must be positioned separately in the pressing process and the welding process, which is wasteful in the process. .

[Problem that the invention seeks to solve]

The purpose of the present invention is to overcome the drawbacks of conventional manufacturing methods by combining press forming and welding of a car body, thereby making it possible to improve production efficiency by integrating parts and shortening processes. The purpose of this invention is to provide a method for manufacturing the same.

[Means to solve the problem]

In order to achieve the above object, the structure of the present invention is such that the side wall of the vehicle body is continuously molded from a single metal plate at the edge of the floor of the vehicle body, and the side wall of the vehicle body is molded from a single metal plate without moving the metal plate. After predetermined parts are welded to the inner surface of the metal plate, the metal plate is bent at the edges to form a box shape, and the edges of adjacent side walls are welded together.

[Effect]

According to the present invention, the main constituent members to be assembled are integrally formed by press working without being separated, and at the same time, predetermined related parts are joined together by welding, and the vehicle body is automatically assembled.

The main structural members of the vehicle body are press-formed into one piece in a continuous unfolded form at mutually related parts, and the main structural members are bent without separating the mutual relationships, and the joined parts are overlapped, and this overlap is performed. Weld the parts together.

In the present invention, predetermined vehicle body parts are welded to the main structural members in an unfolded state, and then further press forming is performed, and the formed parts are welded, so that the main structural members are mutually connected three-dimensionally. Join. In this way, by forming the main components into one piece in advance and repeatedly performing welding and press forming on it simultaneously or alternately, transportation, management, and mutual interaction of the main components can be achieved using conventional manufacturing methods. Production efficiency will be improved by eliminating combination processes.

[Embodiments of the invention]

Example 1 To explain the method of manufacturing a vehicle body according to the present invention based on an example, FIG. 4. The rear wall 3 is the edge 26 of the floor 1,
25 and 27 are successively processed from a single steel plate by press forming. That is, in the front part of the floor 1, there is a raised part 10 which is raised upward so that the transmission can be accommodated thereunder, and a raised part 10 which extends rearward from the raised part 10 to the center part of the floor 1 and which also serves as reinforcement and is raised upward. Strip 9 is formed. Further, the raised portion 10 is provided with an opening 23 through which a speed change operating lever passes. A circular recess 8 is provided in the rear part of the floor 1 to accommodate a spare wheel. Openings 7 through which the wheels face are provided on both rear sides of the floor 1, and these openings 7 are opened in the shape of a semicircular arc on both side walls 2. side wall 2
is provided with an opening 6 for attaching a front door and an opening 5 for attaching a rear door. The rear wall 3 is provided with rectangular openings 11 on both sides for attaching tail lights. In this way, the floor 1, side walls 2, front wall 4, and rear wall 3 of the vehicle body are integrally shaped by pressing a single steel plate, and the necessary openings and extrusions are provided.

Next, as shown in FIG. 2, with the front and rear walls and side walls unfolded, necessary parts, reinforcing members, etc. are joined to each wall by welding. That is, mounting pieces 13 for supporting the left and right seats are welded to the front portion of the floor 1. Further, a reinforcing member 18 bent to have an inverted U-shaped cross section and extending further rearward from the protrusion 9 is fixed by welding, and a horizontal member 12 that extends across the center of the floor 1 to increase the rigidity of the floor 1 is fixed by welding. A part 22 that supports the seat is welded to the central part of the floor 1, that is, the part corresponding to the rear seat. Further, a mounting piece 16 is coupled around the wheel storage recess 8 by welding. A wheel house 17 for closing the inside of the vehicle compartment is welded to the wheel opening 7.
A reinforcing member 19 extending upward and having a box-shaped cross section is fixed to the center of the rear wall 3 by welding. A frame 14 for mounting and supporting an engine, which extends below the front wall 4, is fixed to the front edge of the floor 1 by welding.

In this way, the floor 1 of the car body made of one steel plate
With the front, rear, left and right walls 4, 3, and 2 unfolded as one, a predetermined opening, extrusion, recess, or protrusion is formed, and required attachment parts or reinforcing members are fixed by welding. Then, as shown in FIG.
Then, the side walls 2 are each bent approximately at right angles to the floor 1, and the left and right edges of the front wall 4 are overlapped with the front edges of the side wall 2 and fixed by welding as shown by reference numeral 20, and at the same time The left and right edges of the rear wall 3 are overlapped with the rear edge of the side wall 2 and are joined to each other by welding as shown by reference numeral 21. In this way, the main parts of the vehicle body are press-formed from a single steel plate, the necessary parts are welded and fixed, and then bent again using a press to be assembled. And frame 14
is equipped with an engine, and a bonnet portion covering the engine is connected to the top of the frame 14 and the front wall 4, and furthermore, a suspension system, a power transmission device, etc. are attached, and the upper edge of the side wall 2 has a roof and A lid plate covering the luggage compartment is installed.

Embodiment 2 In the embodiments described above, the roof is to be installed later, but of course the roof can also be preconfigured integrally with the side walls. As shown in FIG. 4, a side wall 2 is integrally formed on one side edge of the floor 1,
A roof 29 and the other side wall 2 are integrally formed on the upper edge of this side wall. In this case as well, after press forming, the required parts are joined by welding, and then the side walls 2, the roof 29, and the front and rear walls 4, 3 are bent to the floor by bending by pressing to form a three-dimensional structure. , the side edge 26 of the floor 1 and the lower edge of the side wall 2 are joined by welding as shown by reference numeral 28 in FIG.
and are joined by welding as shown by numerals 20 and 21.

Embodiment 3 Figures 6 and 7 show the present invention applied to the cab of a cab-over type truck. As shown in FIG. 6, the front wall 33 is continuous with one edge 39 of the floor 36, the roof 38 is continuous with the upper edge 40 of the front wall 33, and the rear edge 41 of the roof 38 is continuous. The rear walls 31 are each integrally shaped from a steel plate.
At the same time, a rectangular recess 34 is provided on the left and right sides of the lower part of the front wall 33, and an opening 35 for mounting a headlamp is provided, and an opening 37 for a front window is provided in the upper part of the front wall 33. It is formed. In the upper part of the rear wall 31 an opening 32 for a rear window is provided. After fixing the required parts by welding to the plate material in which the floor, roof, and front and rear walls are integrated in the unfolded state, each part is bent at approximately right angles from the edges 39, 40, and 41. Then, the lower edge 42a of the rear wall 31 is joined to the front edge 42 of the floor 36 by welding to obtain a three-dimensional structure as shown in FIG. Then, the floor 36 and roof 38 are further formed by press molding.
Then, the side edges of the front and rear walls 33, 31 are bent inward to form a wall portion 43 that abuts the edge of the door.

Embodiment 4 In the three-dimensional molding of the vehicle body according to Embodiment 3, the part to be welded does not necessarily need to be provided on the floor 42, but for example on the roof 38 as shown in FIG.
The front edge 40 of the front wall 33 and the upper edge 40a of the front wall 33 can be arbitrarily selected.

Example 5 In Examples 1 to 4 described above, the floor and side walls, which are the main structural members, are preferably formed from a single steel plate in one draw, but if there is a limit to the capacity of a normal press machine, , as shown in FIG. 9, the molding is sequentially divided from the front part to the rear part by several drawings (processes).

In the example shown in Fig. 9, the front wall part is formed in the first draw, the floor and the first half of both side walls are formed in the second draw, and in this way, the floor and all the front and rear and both side walls are completed in the sixth draw. be done. In addition, in press molding, the front end and rear end of the material and the overlapping parts in each draw serve as a presser against the mold.

Such divisional molding is achieved by configuring one or both of the punch (upper mold) and die (lower mold) of the press device into six parts, and operating these parts in sequence. In this case, for example, at the same time as the step of forming by the fourth draw, a predetermined part is spot-welded to the part already formed by the first draw, thereby shortening the assembly time. Once the main components are positioned in the press, they are held in place until they are formed into a box shape as a vehicle body and welded.

Embodiment 6 In the embodiment shown in FIGS. 9-17, the main components are sequentially molded from one side wall through the floor and front and rear walls to the other side wall. Then, with the main component unfolded, predetermined parts are joined to it by welding, then the main component is bent into a box shape, and furthermore, each side wall and front and rear walls are welded here, and the side walls are attached at the same time. The pre-welded tire compartment is welded to the floor. In this way, basically molding-
The process of welding-forming-welding is repeated alternately to complete the vehicle body. However, since the number of parts to be welded to the floor is quite large, the first half of the floor and the second half are divided into separate welding processes, and the remaining half is formed at the same time. That is, for example, at the same time as welding parts to the rear half of the floor, the peripheral edge of the front wall is bent at right angles to form flanges that will be welded to both side walls, and the openings in the side walls are hemmed (by bending the edges of the openings in the side walls). (wrapping it to the top of the inner panel).

By simultaneously welding the first half and press forming the second half, the processing time can be shortened, and positioning operations for the main components are not particularly required.

〔Effect of the invention〕

The manufacturing method of the present invention is characterized in that the main parts of the vehicle body are pre-integrated and completed by alternately performing welding and press working on this, and the following effects can be obtained.

(1) Since the floor and side walls, which are the main components of the vehicle body, are press-molded as one piece from the beginning, the number of parts is reduced, making production management and transportation easier.

(2) Since the main components of the vehicle body are integrated, it is very easy to automatically assemble predetermined parts thereto. In particular, predetermined parts can be joined while the front and rear side walls, which are the main components of the vehicle body, are in a press-formed state that is unfolded against the floor, eliminating the need to move the main components to the welding process and the associated positioning operations. It is easy to work, it is easy to automate welding work, and productivity is very high.

(3) Since the main components of the vehicle body are integrated from the beginning, compared to constructing and assembling the floor, side walls, etc. separately, there is less need to transport each part individually, and the transport distance is also shortened. The power required for transportation can be reduced, and products are less likely to be damaged during transportation, and the inventory of work-in-progress can be reduced.

(4) Since there are fewer joints between parts, the sealing performance of the passenger compartment against water and dust is improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a vehicle body processed in a first press forming process according to a first embodiment of the present invention;
Figure A is a plan view showing the state in which predetermined parts are joined to the vehicle body by the second welding process, and Figures 3 and 3A are the 3rd welding process.
FIG. 4 is a developed view of the vehicle body according to the second embodiment of the present invention, FIG. 5 is a perspective view of the same after three-dimensional molding, and FIG. Seventh plan view of a vehicle body according to a third embodiment of the present invention
The figure is a perspective view of the vehicle body after three-dimensional molding, FIG. 8 is a developed view of the vehicle body according to the fourth embodiment of the present invention, and FIG. 9 illustrates the press molding process of the vehicle body according to the fifth embodiment of the present invention. 10 to 17 are plan views showing the sixth aspect of the present invention.
It is a perspective view explaining the manufacturing process of the vehicle body concerning an example. 1: Floor, 2: Side wall, 3: Back wall, 4: Front wall, 2
0: Welded part, 21: Welded part, 25, 26, 27:
Edge, 29: Roof, 31: Back wall, 33: Front wall, 3
6: Floor, 38: Roof, 40, 40a, 42, 42
a: Edge.

Claims (1)

[Claims] 1. Molding the side wall of the vehicle body continuously from a single metal plate at the edge of the floor of the vehicle body, and without moving the metal plate, predetermined parts are welded to the inner surface of the unfolded metal plate. 1. A method of manufacturing a vehicle body, which comprises: after joining, the edges are bent to form a box shape, and the edges of adjacent side walls are welded to each other.