JPH10273069A - Reinforcing method of vehicle body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a reinforcing material from falling down by providing a projecting part on a partition plate, next holding a solid bar-like thermosetting foaming reinforcing material with the projecting part, and after executing an electrodeposition process and a baking finish process, foaming and hardening the thermosetting foamed reinforcing material. SOLUTION: A partition plate 6 provided in the model 1 of a structural member having the closed sectional part of a vehicle body is provided with a stud bolt 7. Next, a fixed foaming reinforcing material T is inserted to the stud bolt 7, and in this case, the foaming reinforcing material 3 is held with it so that the bottom face of the foaming reinforcing material 3 is floated from the surface of the partition plate 6. Under this condition, next electrodeposition process is executed so as to form a not yet hardened electrodeposition layer 4, next heating and foaming are executed by a baking finish process so as to form an electrodeposition hardened layer 4', and simultaneously with it, a desired foamed hardened reinforcing material 5 applied to every nook and corner of the space of the fixed closed sectional part can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for reinforcing a vehicle body,
More specifically, in a car production line, a method for reinforcing a vehicle body structural member by filling a foamed and hardened reinforcing material into a closed cross-section portion of a vehicle body pillar or the like having a closed cross-sectional structure, particularly the above-described filled foam The present invention relates to a method of using a solid rod-shaped thermosetting type as a foamable reinforcing material for forming a hardened reinforcing material, attaching it to a specific location under a certain condition, and performing foaming hardening in a baking coating process after an electrodeposition process.

[0002]

2. Description of the Related Art In recent years, it has been called out in the automobile industry to secure the strength and rigidity of the entire vehicle body in order to enhance vehicle safety and to prevent noise and vibration. Among them, a joint part where stress concentrates due to a small deformation such as a torsion of a vehicle body and a part to which a large load such as an impact is applied, for example, a center anchor having a closed cross-sectional structure in which a belt anchor of a seat belt device is mounted, and others. It is desired to impart rigidity to a vehicle body structural member having a closed cross-sectional structure of a vehicle body such as a front pillar at a front part and a rocker part pillar at a bottom part. A device for filling a foamed and hardened reinforcing material into a closed cross section is being developed.

[0003] Therefore, such a reinforcing method of the body structural member with the filling foaming hardening reinforcing material is generally performed in a vehicle assembly line in a body assembly process → an electrodeposition process → a baking coating process. As shown in the figure, first, in the vehicle body assembling process, for example, a self-adhesive or thermosetting foaming reinforcing material 13 in the form of a solid sheet is attached to one of a pair of opposed surfaces 12 forming a closed cross section of the vehicle body pillar 11. After pasting through a separately provided adhesive layer (not shown), it is subjected to an electrodeposition step (electrodeposition liquid immersion) to obtain an uncured electrodeposition film 14.
(Only a part is shown), and then heat bubbling (foam hardening) is performed in a baking coating process to form a filling foam hardening reinforcing material 15 simultaneously with the electrodeposition hardened film 14 '. In this case, one or a plurality of partition plates 16 are provided at appropriate intervals in the closed cross-section of the vehicle body pillar 11 along its longitudinal direction. It is intended to provide a complete filling of the reinforcement 15 by sagging.

However, the conventional method using the thermosetting foamable reinforcing material in the form of a solid sheet has the following problems. i) The thermosetting foamable reinforcing material is moved (transported) to the electrodeposition step after application or during the electrodeposition step (immersion in the electrodeposition liquid).
Depending on the degree of the adhesive force, for example, if the adhesive force is low, it easily falls off or the sticking position shifts,
Conversely, if the adhesive force is too high for stable holding, it will adhere to the worker and the workability will decrease. As described above, in the solid sheet-like attaching method, the reliability of the attaching and fixing is extremely low. In addition, since such adhesive strength easily fluctuates due to a temperature difference depending on the season, there is a problem in adjustment and management thereof. ii) Although it is not completely unrelated to the adhesive strength of the above (i), sticking to at least a surface other than a smooth surface is impossible or at least considerably difficult. iii) At the time of heating and foaming in the baking coating step, a flow-down occurs due to a decrease in viscosity of the thermosetting foamable reinforcing material, and as shown in the figure,
A thin layer portion (15A) is formed, which has a great adverse effect on rust prevention as well as strength reduction.

[0005]

Means for Solving the Problems The present inventors have made intensive studies to solve the problems of the conventional method.
As the thermosetting foamable reinforcing material, a solid rod-shaped thermosetting type is used, and this is attached to the above-mentioned partition plate through a convex portion such as a stud bolt and under a certain condition, and the conventional method is used. Differently, the foamable reinforcing material can be fixed mechanically and securely, the fixing reliability is extremely high, and the space of the predetermined closed section is completely filled without forming a thin layer portion. And found that the present invention was completed.

That is, the present invention relates to a method of filling a foamed and hardened reinforcing material into a closed cross section of a vehicle body having a closed cross section structure in an automobile production line to reinforce the vehicle body. A convex portion is provided on one or a plurality of partition plates provided at appropriate intervals in the inside, and then a solid rod-shaped thermosetting foamable reinforcing material is held on the convex portion, and then electrodeposited. An object of the present invention is to provide a method for reinforcing a vehicle body, which comprises foaming and curing a thermosetting foamable reinforcing material through a process and a baking coating process.

The solid rod-shaped thermosetting foamable reinforcing material (hereinafter sometimes simply referred to as a foaming reinforcing material) used in the present invention may be any type and composition as long as it is a thermosetting type and presents a solid at room temperature. There are no restrictions on, for example, polyurethane,
Polyvinyl chloride type, polyethylene type, foamed rubber type, phenol resin type, styrene resin type, ABS resin type, epoxy resin type, polyolefin resin type, etc.
Among them, epoxy resin is particularly preferable. Less than,
The epoxy resin system will be described in detail. This epoxy resin foamable reinforcing material is generally made of various epoxy resins.
(E.g. glycidyl ether type, glycidyl ester type, glycidylamine type, linear aliphatic epoxide type,
Alicyclic epoxide type), heat-activated curing agent (generally 8
It shows activity in the temperature range of 0 to 200 ° C., for example, dicyandiamide, 4,4′-diaminodiphenyl sulfone,
Imidazole derivatives such as -n-heptadecyl imidazole; isophthalic acid dihydrazide; N, N-dialkyl urea derivatives; N, N-dialkyl thiourea derivatives; and foaming agents (generally stable even at room temperature even when mixed with And substances that decompose by heating to generate gas, for example, azo compounds such as azodicarbonamide and azobisisobutyronitrile; nitroso compounds such as dinitrosopentamethylenetetramine; p-toluenesulfonyl hydrazide;
A sulfohydrazide compound such as 4,4'-oxybenzenesulfonylhydrazide, and a heat-expandable unexpanded balloon, etc.), and a suitable filler (for example, calcium carbonate, talc, asbestos, silicic acid, carbon black, etc.) If necessary, a reactive diluent for epoxy resin (butyl glycidyl ether, monoglycidyl ether of long-chain alcohol, etc.), thermoplastic polymer (acrylic resin, vinyl acetate resin, polyolefin polymer, etc.), plasticizer (dioctyl phthalate) Phthalic acid type; phosphoric acid type such as tricresyl phosphate), an inert diluent (such as pine oil), a foaming aid, and a foam stabilizer. It shows a viscous solid. Component by weight Epoxy resin 100 Heat activated curing agent 0.1-20 Foaming agent 0.1-20 Filler 50-300 Other (thermoplastic polymer, etc.) 0.1-100

A stud bolt or the like that forms the convex portion used in the present invention includes a stud bolt and the like, which can be directly or indirectly installed on a partition plate provided in a structural member such as the above-mentioned vehicle body pillar, and has a convex shape. There is no limitation on the shape and material as long as the portion can insert and hold the solid rod-shaped thermosetting foamable reinforcing material, but the shape is, for example, as shown in FIGS. 1A to 1C. (A) a structure similar to a candle holder (in this case, the bottom surface of the expandable reinforcing material can be pierced and no special work is required on the expandable reinforcing material side); (In this case, the nut shown on the right, which is screwed into the thread, is embedded in the bottom of the foamable reinforcing material); or (C) the shape shown on the left Stud bolt (in this case, foam the concave clip shown on the right to fit the convex part Embedded in the bottom of the conductive reinforcing material). In order to install such a convex portion on the partition plate, it is usually sufficient to fix the convex portion to the partition plate by arc welding.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for reinforcing a vehicle body according to the present invention will be described in detail with reference to FIG. First, stud bolts 7 (schematically shown for simplicity) are installed on a partition plate 6 provided in a model 1 of a structural member having a closed cross section of a vehicle body by the above-described method. Next, the stud bolt 7
In this case, the foamable reinforcing material 3 is held such that the bottom surface of the foamable reinforcing material 3 is floated from the surface of the partition plate 6 (in other words, the following method). In the electrodeposition step, a sufficient gap for contacting the electrodeposition liquid is secured over the entire surface of the partition plate 6). In this state, it is subjected to the next electrodeposition step to form an uncured electrodeposition film 4 (only part of which is shown), and then heat-foamed (foamed and cured) in a baking coating step to form an electrodeposition cured film 4 ′. Simultaneously with the formation, the desired foam hardening reinforcing material 5 can be formed over the entire space of the predetermined closed section. The size of the foamable reinforcing material 3 to be used may be set according to the capacity of the foaming hardening reinforcing material to be filled, the expansion ratio under heating, the space capacity at the closed cross section, the shape, and the like. For example, it is designed to have a foaming ratio of about three times.

[0010]

Next, the present invention will be described more specifically with reference to examples. Example 1 The foamable reinforcing material has the following composition. Composition parts by weight Epoxy resin (Eicoat 1001 manufactured by Yuka Shell Co., Ltd.) --- 45 Latent curing agent (dicyandiamide) --- 5 Blowing agent (azodicarbonamide) ---- 3 Filler (carbon black) --- 42 Others (thermoplastic polymer, etc.) 5 The composition is stirred and mixed at 70 ° C., and while the mixture is extruded, cooled and molded to form a 4 × 4 × 15 cm solid rod-shaped foamable reinforcement. Get the material. In addition, a concave clip (resin molded product) shown in FIG. 1C (right side) is embedded in a predetermined portion (bottom surface) of the reinforcing material. Next, a model box (5 × 5 × 30c) of a closed section structural member as shown in FIG.
After fixing the stud bolt (manufactured by Pop Rivet Fastener Co.) shown in FIG. 1 (C) (left side) on the partition plate 6) by arc welding, the foamable reinforcing material described above is applied to the stud bolt. , One-touch insertion through fitting by the concave clip. Next, the inside of the box is heated at 170 ° C. for 20 minutes to form a foam-hardened reinforcing material (foaming magnification set to 3 times). When the foam hardening reinforcing material was taken out from the model box, it was found that the foam box was completely filled up to every corner, and that the cut surface had a uniform foaming state and was firmly adhered to the entire periphery of the model box. Furthermore, there was no outflow from the gap (0.2 mm) in the box.

[0011]

According to the method of the present invention having the above structure, the foamable reinforcing member can be easily and reliably and firmly installed on the partition plate provided on the structural member having the closed cross section of the vehicle body. To prevent the foamable reinforcing material from dropping or displacing from the installation location during transfer (conveyance) to the cell or due to the water pressure during the immersion of the electrodeposition liquid in the electrodeposition process, and to fill the space of the closed-section structural member Electrodeposition cured films can be formed up to. Moreover, it is recognized that the predetermined space can be completely filled without the problem of run-down in the baking coating process.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a specific example of a convex portion used in the method of the present invention and a combination of a bonding state of the convex portion and a foamable reinforcing material side.

FIG. 2 is a simplified sectional view showing a specific embodiment of the method of the present invention.

FIG. 3 is a simplified sectional view showing a specific mode of a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Model of closed cross-section structural member of vehicle body 3 Foaming reinforcing material 4 Uncured electrodeposition film 4 'Electrodeposited film 6 Partition plate 7 Stud bolt

Claims (4)

[Claims] 1. A method of reinforcing a vehicle body by filling a foamed and hardened reinforcing material into a closed cross section of a vehicle body having a closed cross section structure in an automobile production line, the method comprising: A convex portion is provided on one or a plurality of partition plates provided in the above, and then on the convex portion,
A method for reinforcing a vehicle body, comprising: holding a thermosetting foamable reinforcing material in the form of a solid rod, and then subjecting the thermosetting foamable reinforcing material to foaming hardening through an electrodeposition step and a baking coating step. 2. A solid rod-shaped thermosetting foamable reinforcing material which is an epoxy resin-based, room-temperature viscous solid and is inserted into a convex portion and held as if a candle is pierced into a candle holder. The reinforcing method according to claim 1, wherein the reinforcing method is performed. 3. The reinforcing method according to claim 1, wherein a thread is provided in the convex portion, and a nut screwed to the thread is embedded in the bottom surface of the solid rod-shaped thermosetting foamable reinforcing material. 4. The reinforcing method according to claim 1, wherein a clip fitted to the convex portion is buried in the bottom surface of the solid rod-shaped thermosetting foamable reinforcing material.