JPH09175456A - Assembling accuracy confirming method of automobile body and automobile body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To confirm the assembling accuracy of divided members simply and accurately in an assembly jig, by boring a hole for confirming the accuracy in one side divided member positioning on the outside, while engraving a marking of a cross form and the like on the other side divided member positioning at the inner side, at the position corresponding to the hole for confirming the accuracy. SOLUTION: When a car body structure is applied to the cab 10 of a cab-over type truck, a round hole 58 for accuracy confirming is bored into the flange 14a of a joint A positioning outside, of the joints A and B of the front side assembly 12 and the rear side assembly 14, while a cross form of marking 60 is engraved on the flange 12a of the joint B positioning at the inner side, at the position corresponding to the round hole 58. A round hole 62 for accuracy confirming is bored into the joint C positioning outside, of the joints C and D of the rear side assembly 14 and the lower side assembly 16, while a cross form of marking 64 is engraved on the joint D corresponding to a fender 36 positioning inside. The assembling accuracy of one side divided member and the other side divided member is confirmed by the relative positions of the holes for accuracy confirming and the markings.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of confirming the assembly accuracy of an automobile body such as a cab of a cab-over type truck,
Also, the present invention relates to a body structure of an automobile whose assembly accuracy can be easily confirmed.

[0002]

2. Description of the Related Art A conventional cab structure for a cab-over type truck and a method for assembling the same will be described with reference to an exploded perspective view of FIG. 1 showing an example of a preferred embodiment of the present invention for convenience. The cab, designated generally by the numeral 10 in the drawings, is constructed by assembling and integrally combining three subassemblies or split members, namely, a front assembly 12, a rear assembly 14, and a lower assembly 16. ing.

The front assembly 12 mainly comprises left and right front pillars 18, a front panel 22 and a front rail 24 that limit a front window opening 20 to which a windshield glass is attached in cooperation with the front pillar 18. It is a sub-assembly in which various main parts are attached with various accessory parts not shown in the figure. Further, the rear assembly 14 includes the left and right side walls 2.
6, a rear wall 28 whose both ends in the vehicle width direction are joined to the rear ends of the left and right side walls 26, and a roof whose left and right side ends and rear ends are joined to the upper ends of the left and right side walls 26 and the rear wall 28. Thirty
Is a main constituent member, and various auxiliary parts not shown are attached to these main constituent members to form a subassembly. The lower assembly 16 includes a pair of left and right underframes 32 (only the respective front end portions are shown in the figure) extending in the longitudinal direction of the vehicle body and constituting the main strength member of the cab 10. A floor 34 that is fixed to the upper side of the frame 32 to form a floor of a vehicle compartment, above which a driver's seat and a passenger's seat, and a nap bed and the like arranged behind these seats and extending in the vehicle width direction are provided. The left and right fenders 36 mounted on both left and right sides of the floor 34 are main constituent members, and various auxiliary parts (not shown) are attached to these main constituent members to form a subassembly.

In the case of a large truck, the front assembly 12, the rear assembly 14, and the lower assembly 16 are box-shaped and have a length in the vehicle width direction, a vehicle body front-rear direction, and a height of about 3 meters. The robot is automatically spot-welded at a predetermined position in a state where it is loaded into an assembly jig consisting of a frame by an appropriate transfer device and automatically fixed at many points by a number of clamps. When combined, the white body of the cab 10 is manufactured. In the case of the cab 10 shown in the figure, the front end joint A of the side wall 26 of the rear assembly 14 adjacent to the roof 30 is superposed from the outside on the upper end joint B of the front pillar 18 of the front assembly 12 by spot welding. The joint C of the lower end and the front end of the side wall 26 of the rear assembly 14 which is joined to the lower assembly 1 is
It is superposed from the outside and joined to the joint portion D of the middle portion of the fender 36 of No. 6 in the front-rear direction by spot welding. Further, the front pillar 1 in the front assembly 12
The joint E at the lower end of 8 is superposed on the joint F at the lower front end of the lower assembly 16 from the outside and joined by spot welding.

The cab 10 assembled as described above.
In this white body, the shape dimension of the front window opening 20 of the front assembly 12 in the state of being assembled to the white body improves the appearance of water leakage and the appearance of the windshield glass peripheral portion attached to the opening 20. Therefore, the shape size of the door opening 38, which is limited to the left and right sides by the three members of the front assembly 12, the rear assembly 14, and the lower assembly 16, is important for preventing the water leakage from the peripheral edge of the door and improving the appearance. It is important to improve the appearance.

On the other hand, each of the front assembly 12, the rear assembly 14, and the lower assembly 16 is an assembly of a plurality of sheet metal parts, which are usually press-formed thin steel plates, and the sheet metal parts themselves have manufacturing errors. In addition, inevitable assembly error occurs when assembling a plurality of sheet metal parts, and each assembly 12, 14 and 16 is a thin plate structure even after completed as a subassembly. Therefore, it has a property that it is essentially flexible. Further, each of the above-mentioned assemblies 12, 14 and 1
6 are clamped at a plurality of places respectively, and the joints A and B,
The assembly jig that joins C and D and E and F by spot welding also has an unavoidable error in terms of manufacturing technology. Furthermore, since many white bodies are repeatedly assembled, the position of the clamp device is increased. Error occurs on the jig side due to changes in the value, wear of the clamp part, or the like.

Therefore, when assembling the white body of the cab 10, it is necessary to confirm the assembling accuracy by confirming the shape dimensions of the front window opening 20 and the door opening 38. Therefore, conventionally, an operation of confirming the assembly accuracy of the assembled cab white bodies by using an inspection jig is performed for each preset number of units for quality control. As an example of the inspection jig, a jig for the door opening 38 is shown in FIG. The jig, which is generally indicated by reference numeral 40, is for examining the dimension of the shape of the door opening 38 on the left side of the vehicle body, and a large number of jigs are arranged at positions corresponding to the outer peripheral edge of the door in the door contact portion of the door opening 38. 42 of the inspection tool, a grid-like frame body 44 made of pipe with the inspection tool 42 mounted on the outer peripheral portion, and the frame body 44
To the cab white body using the mounting bolt holes of the door hinge mounting portions 46 and 48 provided on the front pillar 18 of the front assembly 12.
With

Due to the nature of the jig, the inspection tool 42 is made of an appropriate material that has high rigidity and is as lightweight as possible.
4 is formed of a resin pipe, for example. In addition, among the many inspection tools 42, the inspection tool 42a arranged along the lower edge of the door opening 38 has a door-contact contour that faces the outer peripheral edge of the door opening 38, which is indicated by a chain line in the figure. A set bolt 54 for setting a predetermined appropriate gap is provided between the surface 38a and the inspection tool 42b arranged so as to face the rear vertical edge of the door opening 38, and the door opening edge is provided. There is provided a screw type clamp 56 for gripping the flange portion 38b (only a part of which is shown by a chain double-dashed line in the drawing) that limits the distance.

The supporting portions 50 and 52 are fixed to the door hinge mounting portions 46 and 48 of the front pillar 18 with mounting bolts, and the jig 40 is properly mounted to the door opening 38 using the set bolt 54 and the screw type clamp 56. After that, the gaps S between the outer edges of the many inspection tools 42 and the door door contact contour surface 38a are examined, and it is inspected whether the gaps S are within the set gap (for example, 5 ± 1 mm). Similarly, a jig corresponding to the regular shape and size of the front window opening 20 of the front assembly 12 is attached to inspect the gap between each inspection tool and the window opening edge, and the assembled cab white body is a product. To determine whether it is suitable.

In order to confirm the accuracy of the cab assembly using the above inspection jig, it takes a lot of time to attach and detach the jig, so that the inspection cost becomes high and the jig is heavy (for door inspection for large trucks). In the case of the jig, the weight is usually 20 kg or more.)
Front assembly 12, rear assembly 14, and lower assembly 16
Can be inspected only after the white body is completed, because it cannot be inspected when it is carried in and clamped in the assembly jig. There was a bug that could not be corrected.

[0011]

SUMMARY OF THE INVENTION The present invention was devised in view of the above circumstances, and when assembling an automobile body composed of a plurality of dividing members, the assembling accuracy of the dividing members can be easily and accurately set in an assembling jig. As a result, the assembly work cost of the automobile body can be reduced, and the fatigue of the operator can be greatly reduced. It is intended to provide a structure.

[0012]

In order to achieve the above object, the present invention provides a method for assembling an automobile body by joining the joining portions of a plurality of divided members to each other by lap welding and joining them. A hole for accuracy confirmation is drilled in one of the divided members located on the outer side, and a cross-shaped mark or the like is engraved on the part corresponding to the hole for accuracy confirmation of the other divided member located on the inner side at the joint. A method for confirming the assembly accuracy of an automobile body, which is characterized by confirming the assembly accuracy of the one divided member and the other divided member by the relative position of the accuracy confirmation hole and the marking. is there. Further, the present invention comprises a plurality of split members in which the joint portions are overlapped with each other and welded together, and a hole having an appropriate shape is formed in the joint portion of one of the split members located outside the joint portion. An object of the present invention is to provide a body structure for an automobile, which is characterized in that a marking of an appropriate shape is provided at a portion corresponding to the hole of the other divided member which is provided and is located inside at the joining portion.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the present invention will be specifically described below with reference to FIGS. (Note that in order to explain the conventional technique, re-description is omitted for the items already described with reference to FIG. 1.) First, in the exploded perspective view of FIG. 1, the front assembly 12 and the rear assembly are shown. Of the joints A and B with 14, the flange portion 14a that limits the door opening 38 of the joint A located on the outside
In addition, a round hole 58 for accuracy confirmation is formed, and a cross-shaped marking 6 is formed on a portion of the flange portion 12a that limits the door opening 38 of the joint portion B located inside, corresponding to the round hole 58.
0 is engraved.

Further, of the joints C and D of the rear assembly 14 and the lower assembly 16, the joint C located on the outer side is provided with a round hole 62 for confirming the accuracy. A cross-shaped stamp 64 is formed on the corresponding joint D of the fender 36 that is superposed and located on the inner side. further,
Of the joints E and F of the front assembly 12 and the lower assembly 16, the joint E located on the outer side by overlapping is provided with a round hole 66 for accuracy confirmation, and the joint F located on the inner side.
A cross-shaped marking 68 is formed on the surface corresponding to the round hole 66.

Round holes 58, 62 and 6 for confirming the accuracy
6. Cross-shaped markings 60, 64 and 68 are provided on each assembly 1
Corresponding constituent members 2, 14 and 16 are respectively punched or engraved when press working. Round hole 5 above
8, 62 and 66 and the stamps 66, 64 and 68, which are provided at the time of press molding, are assembled together with other members constituting each assembly by using separate jigs in the sub-assembling step, The assembly 12, the rear assembly 14, and the lower assembly 16 are carried into the white body assembly jig of the cab 10, and the respective important parts are clamped by a large number of clamping devices provided in the assembly jig.

With the assemblies 12, 14 and 16 clamped in the assembly jig, the round holes 58, the markings 60 and the round holes 62 at the joints A and B, C and D, E and F are formed. The relative positions of the marking 64 and the round hole 66 and the marking 68 are examined.
As shown by the solid line in the enlarged side view of FIG. 3, if the center of the round hole and the center of the engraving are aligned, each assembly 12,
14 and 16 manufacturing accuracy, and each assembly 12,
It was confirmed that the relative positions of the assembly jigs 14 and 16 in the assembly jig were correct, and as shown by the dotted line in FIG. However, it is confirmed that the product is within the acceptable range with no problem in commerciality. After performing visual confirmation in the assembly jig as described above, if there is no problem in quality,
The joints A and B, C and D, and E and F are integrally joined by spot welding to manufacture a white body of the cab 10 as shown in FIG. Therefore, during the assembly work of the white body of the cab 10, it is not necessary to use a heavy inspection jig as shown in FIG. This has the advantage of reducing operator fatigue, and because each assembly 12, 14 and 16 is in the assembly jig and is clamped and the assembly quality is checked before welding is performed, the assembly quality can be confirmed immediately. It is possible to take necessary measures, and it was discovered that it was not qualified in the inspection after welding as in the past.
There is no problem of rejected products that must be discarded.

When a large number of cab white bodies are assembled using the above assembly jig, displacement and wear of the clamps occur on the assembly jig side, while the front assembly 1
2, the rear assembly 14 and the lower assembly 16 side are also subject to change in quality of the components due to wear of the press mold of the respective components, or deformation or wear of the sub-assembly jig of each assembly. There is a degree error. Also in these cases, the relative positions of the round holes 58 and the markings 60, the round holes 62 and the markings 64, and the round holes 66 and the markings 68 in each of the joints A and B, C and D, and E and F are continuously set. By checking, it is possible to confirm the tendency of the quality of the assembly of the cab 10, that is, as a white body, and necessary measures, for example, the position correction of the clamp of the assembly jig, the replacement of the worn clamp, etc. There is an advantage that similar repair of the sub-assembling jig and, in some cases, repair of the press molding die can be performed appropriately in a timely manner.

Further, in the production preparation process of the new model vehicle, the round holes 58, 6 for confirming the accuracy in the respective connecting portions of the front assembly 12, the rear assembly 14 and the lower assembly 16 are provided.
2 and 66 and the corresponding markings 60, 64 and 68 are respectively made to coincide with each other, and the merchandising of the entire cab white body (total height, width, overall length, and shape dimension of front window opening 20, door opening 38) is performed. While checking, as described above,
By positioning the frame-shaped assembly jig, which has a width and height of 3 meters each, and a number of accessory devices such as clamps mounted on the jig, the round hole and the engraved mark are assembled for subsequent production. There is an advantage that it can be used in reverse as an effective tool for fixing a jig.

In the above-mentioned embodiment, the accuracy confirmation holes 58, 62 and 66 are exemplified as round holes which can be easily drilled at the time of press working, but they may be elliptical holes or holes of any shape. Obviously, the markings 60, 64 and 68 that can be made and cooperate with each other can be changed to markings of any shape such as a doll other than the illustrated cross shape. Furthermore, the present invention is not limited to assembling a cab for a cab-over type truck, but can be widely applied to body assembly of a one-box vehicle.

[0020]

As described above, according to the method for checking the accuracy of assembling the automobile body of the present invention, when assembling the automobile body by joining the joint portions of the plurality of divided members to each other by lap welding, A hole for accuracy confirmation is formed in one of the divided members located outside in the joint portion, and a cross shape or the like is formed in a portion corresponding to the accuracy confirmation hole in the other divided member located inside in the joint portion. Is marked, and the assembling accuracy of the one divided member and the other divided member is confirmed by the relative position of the accuracy confirmation hole and the marked, which is heavy and requires a lot of labor for installation and removal. Since it is possible to confirm the assembly accuracy quickly and easily without using an inspection jig that requires, it is possible to reduce the manufacturing cost and reduce the fatigue of the operator.
Before each split member is inside the assembly jig and welded together, you can check the assembly accuracy and take necessary measures.
There are advantages such as preventing the generation of rejected products in advance.

Also, the body structure of an automobile according to the present invention comprises a plurality of divided members which are joined together by overlapping the joined portions and welded to each other. A hole having an appropriate shape is bored, and a stamp having an appropriate shape is provided at a portion corresponding to the hole of the other split member located inside the joint portion. When assembling the white body, the assembly accuracy can be checked quickly and easily and accurately without using a special inspection jig, etc., reducing the manufacturing cost and the labor of the inspection work by the operator. There are possible effects.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment in which an assembly accuracy confirmation method according to the present invention is applied to cab assembly of a cab-over type truck.

FIG. 2 is a side view of the cab shown in FIG. 1 after completion of assembly.

FIG. 3 is an enlarged side view showing a relationship between a hole for accuracy confirmation and a marking in FIG.

FIG. 4 is a side view of a conventional door opening inspection jig used for checking the cab assembly accuracy.

[Explanation of Codes] 10 ... Cab, 12 ... Front Assembly, 14 ... Rear Assembly,
16 ... Lower assembly, 18 ... Front pillar, 20 ... Front window opening, 22 ... Front panel, 26 ... Side wall, 28 ... Rear wall, 30 ... Roof, 32 ... Underframe, 34 ... Floor, 36 ... Fender, 38 ... Door openings, 58, 62 and 66 ... Circular holes for accuracy confirmation, 60, 64 and 68 ... Cross-shaped markings, A, B, C, D, E and F ... Joints.

Claims (2)

[Claims] 1. When assembling an automobile body by joining the joints of a plurality of split members to each other by lap welding, a hole for accuracy confirmation is formed in one of the split members located outside of the joints. Along with drilling, a marking such as a cross is engraved in the part corresponding to the accuracy confirmation hole of the other split member located inside at the same joint, and the relative relationship position between the accuracy confirmation hole and the marking. The assembling accuracy confirmation method for an automobile body, characterized by confirming the assembling accuracy of the one divided member and the other divided member by 2. A plurality of split members, which are welded to each other such that the joint portions are overlapped with each other, and a hole having an appropriate shape is formed in the joint portion of one of the split members located outside the joint portion. A body structure for an automobile, characterized in that an engraving of an appropriate shape is provided in a portion of the other divided member located inside of the joint portion, the portion corresponding to the hole.