JPS62234785A - Sealing method for automobile door - Google Patents

Abstract

PURPOSE:To improve the rust preventive quality of the hemming connection part of a door by applying a heat curing resin tape to said part before mounting a door to a main automobile body, and applying a sealing material to the remining part of the connection after electrodeposit coating. CONSTITUTION:The external surfaces of outer and inner panels 1 and 2 aligned to each other is hemming connected and an automobile door 4 is thereby consti tuted. A door hinge 5 is welded or bolted to the inner panel 2 of the door 4. In this door assembly process, a heat curing resin tape 6 is applied to a concealed portion behind the door hinge 5 before or after the fitting thereof to the door 4. Then, the door 4is so fitted to the pillar 7 of a main body as to be freely capable of turning via the door hinge 5. Thereafter, the main body fitted with the door 4 is applied with an electrodeposit coat through an electrode posit process. After the application of said coat, the remaining part of the hemming connection part 3 is applied with a sealing material 8 of PVC system, using a gun.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sealing method for a hemming portion of an automobile door.

[Prior art]

Conventionally, as a sealing method applied to prevent rust on the edge part of the outer panel of a door, for example, an automobile door is constructed by hemming the outer periphery where the outer panel and the inch panel contact, and this door is attached to the main body of the automobile. Attach it through the door hinge and apply electrodeposition paint in this state.
Thereafter, a PvC sealing material is applied to the entire circumference of the hemming joint of the door, and this sealing material is solidified and sealed by a baking process in the intermediate coating. (Refer to Japanese Utility Model Application Publication No. 52-6310) [Problems to be solved by the invention] However, in such conventional sealing methods, since the sealant is applied with the door attached to the main body, Even when the door is open, it is very difficult to insert the injection part of the sealing gun into the part of the hemming joint that corresponds to the door hinge mounting part, that is, the hidden part behind the door hinge, and it is often difficult to insert the injection part of the sealing gun into the part that cannot be sealed. There was a problem in that the result was that it left behind, causing estrus in the market.

The present invention has been made by focusing on such conventional problems, and provides a seal for an automobile door that completely seals the difficult-to-seal area at the hemming joint of the door and achieves high rust prevention performance. The purpose is to provide construction methods.

[Means for solving problems]

In order to achieve such an object, the present invention provides an automobile door constructed by hemming the abutting outer peripheries of an outer panel and an inner panel, in which a thermosetting resin tape is pasted to a part of the hemming joint during the door assembly process, After the main body to which the door is attached is electrocoated, a sealing material is applied to the remaining portion of the hemming joint.

[For production]

Thermosetting tape is applied to the difficult-to-seal areas of the hemming joint before the door is attached to the main body, so the job can be completed perfectly.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1a and 1b, an automobile door 4 is constructed by hemming 3 the abutting outer peripheries of an outer panel 1 and an inner panel 2, and a door hinge 5 is welded or bolted to the inner panel 2 of the door 4. Attach by. In this door assembly process (hereinafter referred to as the door assembly process), before or after attaching the door hinge 5 to the door 4, a part of the hemming joint 3, specifically a part corresponding to the door hinge 5 attachment part, that is, a hidden part behind the door hinge 5 is removed. A semi-cured adhesive thermosetting resin tape 6 is applied to the area. This thermosetting resin tape is made of, for example, epoxy resin.

Next, in the vehicle body assembly process, the door 4 is rotatably attached to the pillar 7 of the main body via the door hinge 5, as shown in FIGS. 2a and 2b.

Thereafter, the main body to which the door 4 is attached is subjected to an electrodeposition coating process, specifically, a chemical electrodeposition process and an electrodeposition baking process. Since the thermosetting resin tape 6 is small and semi-cured, the electrodeposition solution will not be contaminated or the resin will not be washed away in the chemical electrodeposition process. Furthermore, since it does not harden in close contact with the panel surface until before the baking process, the electrodeposition liquid spreads to every corner. The process then proceeds to the electrodeposition baking step, where it is solidified by heating during this electrodeposition baking step, and sealing of a portion of the hemming joint 3 is completed.

After the electrodeposition is applied in this manner, a paste-like PVC sealing material 8 which is inexpensive and has good application workability is applied to the remaining part of the hemming joint 3 of the door 4 attached to the main body using a gun.

Next, the main body to which the door 4 is attached is coated with an intermediate coat in an intermediate coating process, and in the drying process of this process, the sealing material 8 is heated and solidified in a drying oven, and the sealing of the remaining part of the hemming joint 3 is completed. do.

In this way, the entire hemming joint 3 of the door 4 is sealed, but the areas that were previously difficult to seal are also sealed by pasting thermosetting resin tape 6 before attaching the door 4 to the main body. Because it is rubbed, the sealing is completed perfectly and no rust occurs on the market.

Moreover, in order to attach the tape 6 to the minimum necessary locations,
It's cheap.

Although the above embodiments have been explained using a side door as an example, the present invention is not limited to this and can of course be applied to a back door and the like.

〔effect〕

As described above, according to the present invention, it is possible to completely seal the difficult-to-seal portion of the hemming joint of the door, and it is possible to obtain high rust prevention performance.

[Brief explanation of drawings]

1a, b and 2a, b are process diagrams of the sealing method of the present invention, respectively. FIG. 1a is a perspective view of the main part of the door in the door assembly process; FIG. Figure 2a
2 is a perspective view of a main part of the main body in the intermediate coating process, and FIG. 2 is a horizontal sectional view thereof. ■... Outer panel, 2... Inner panel, 3... Hemming joint, 4...
Automobile door, 5...Door hinge, 6...
...Thermosetting resin tape, 7...Pillar (part of main body) 8...PVC sealing material. Raku 1 blindness (a) (b)

Claims (2)

[Claims] (1) In an automobile door constructed by hemming the abutting outer periphery of an outer panel and an inner panel, a thermosetting resin tape is applied to a part of the hemming joint during the door assembly process, and the main body to which the door is attached A sealing method for an automobile door, which comprises electrodepositing and then applying a sealant to the remaining part of the hemming joint. (2) The method for sealing an automobile door according to claim 1, wherein the part to which the thermosetting resin tape is applied in the door assembly process is a part corresponding to the hinge attachment part of the hemming joint.