JPS6237128A - Preparation of synthetic resin filler pipe with flange - Google Patents

Abstract

PURPOSE:To mold monolithically a thick flange,by preparing a hollow body having a concave groove by blow molding a synthetic resin parison in a divided mold having a concave groove on the inner surface and by clamping and adhering the concave groove of the hollow body by actuating the mold. CONSTITUTION:The width of a concave groove 17, which is perpendicular to the axial line of the pipe to be prepared, is enlarged by actuating a mold for actuation 14. A mold 11 is then opened and a synthetic resin parison is extruded in the open mold. The mold 11 is thereafter closed and air is blown into the mold through a blowing pin 18. The synthetic resin parison is thereby fully enlarged on the inner surface of the mold to prepare a hollow body having a concave groove. The width of the concave groove 17 is then reduced by actuating the mold for actuation 14 to clamp and adhere the synthetic resin spread on the inner surface of the concave groove 17 of the mold and to prepare a thick flange which is monolithic with the pipe body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a filler pipe made of synthetic resin and having seven lunges integrally attached to the outer periphery of the filler pipe.

[Conventional technology]

Currently, metal filler pipes are used in automobiles. This metal filler pipe has a flange attached to the outer periphery of the pipe by welding for fixing it to an automobile.

Recently, filler pipes made of blow molded synthetic resins have been actively developed because they are lighter than metals and the shape can be freely selected.

[Problems that the invention attempts to solve]

In the case of blow molding of the above acid-containing resin, the parison is molded into a
It is easy to integrally mold the compressed 7-lunge f into the pinch-off part or parting part of the sandwiched part, but it is necessary to attach it to the outer periphery of the pipe that will become the fuel passage, almost at right angles to the axis of the pipe, and firmly fix it to the car. It was impossible to integrally mold a thick flange for this purpose.

In view of the above circumstances, an object of the present invention is to provide a method for manufacturing a synthetic resin filler pipe in which a thick flange perpendicular to the axis of the pipe is integrally attached to the outer periphery of the pipe by blow molding. .

[Means for solving problems]

The present invention has been made to achieve the above-mentioned object, and its gist is that a synthetic resin parison is blow-molded inside a split mold with grooves formed on its inner surface. A method for manufacturing a synthetic resin filler pipe with flanges, in which a hollow body is inserted, and then a concave groove portion of the hollow body is pressed and fused by operation of a mold.

[Specific structure and operation of the invention]

The present invention will be explained below based on one practical example with reference to the drawings.

Figure 1 and ji! Figure 2 is a perspective view and a vertical cross-sectional view of a synthetic resin filler pipe produced by the method of the present invention. In the figure, reference numeral 1 indicates a filler pipe body (hereinafter referred to as pipe body) that serves as a fuel passage. On the outer periphery near one end of the main body 1, there is a central axis 1Ij of the pipe main body 1.
2 flange 2 perpendicular to l a is installed, and this 7
The flange 2 has a fixing hole 2a through which a bolt passes. In addition, the pipe body 1 near the flange 2 is connected to the inside of the pipe body 1 in order to exhaust air inside the fuel tank when fuel is injected into the fuel tank (not shown) through the pipe body 1. , one end of a branch pipe 3 communicating with outside air is integrally attached to form a filler pipe 4.

Since this filler pipe 4 is fixed by inserting a bolt (not shown) into the fixing hole 2a of the 7 lange 2, the 7 lange 2 needs to have a sufficient wall thickness to withstand this.

The flange 2 as described above is integrally molded with the pipe main body 1 in the following manner. That is, FIGS. 3 and 4 are front views of one side of a part of a divided mold for Ar-molding the vicinity of the seven flange 2 of the filler bar 4. FIG. The gold layer 11 is composed of a main mold 13 fixed to the back plate 12 and an operating mold 147. This operating mold 14 is connected to a hydraulic cylinder 15 fixed to the back plate 12.
It is pivoted along the slide pin 16 attached to the main mold 13, and expands or reduces the width of the groove 17 formed by the main mold 13 and the operating mold 14. It has become.

To mold the filler pipe 4 using the upper mold 11, first, the working mold 14 is driven to enlarge the width of the groove 17 in the direction perpendicular to the axis of the pipe to be molded. Next, the mold 11 is opened, and after extruding the synthetic 41R parison between the opened molds, the mold 11 is closed and air is blown through the blow pin 18. As a result of this operation, the synthetic resin spreads within the mold 11, forming a hollow body with grooves, as shown in Figure M3. Next, the operating hanger 2! ! 14 f/! : When the width of the groove 17 is reduced by driving as shown in FIG.
The synthetic resins spreading on the inner surface of the pipe 7 are pressed and fused together to form a thick flange 2 that is integral with the pipe flange 1. After the synthetic resin has cooled and solidified, open it in the mold 11 and take it out, and cut off the resin blocking the ends of the pipe body 10 and 4 [io] and the branch pipe 3 to form an integral wall thickness 7 lange. A filler pipe 4 having the following properties is obtained.

The thickness of the seven flange can be adjusted by varying the width of the groove 17 when expanded, and by changing the amount of thickness in the groove 17. At this time, the driving width of the operating metal member 14 is usually regulated by a hydraulic cylinder or by providing a stopper.

Although the hydraulic cylinder 15 is fixed to the back plate 12 in the above explanation, it is fixed to the main mold 13 and the operating mold 14 is fixed to the main mold 13.
may be attracted to the main mold 13.

[Effects] As described above, the method of the present invention allows the production of lightweight synthetic resin filler pipes having 7 thick-walled 7-lunges, which have conventionally been difficult to blow mold, easily and inexpensively. Therefore, it will greatly contribute to the future automobile industry.

[Brief explanation of the drawing]

Figures 1 and 2 show filler pipes made by the method of the present invention, with Figure 1 being a perspective view and Figure 2 showing the filler pipe made by the method of the present invention.
The 1-1 line cross-sectional view, Figure 3 and wL4 figure are 7
One side of the mold that molds the vicinity of the flange is required, and I
! Figure c3 shows the parison being sandwiched with the groove expanded and blown into the cavity, and Figure 4 shows the groove being pressed and fused to form a flange. l... Filler pipe body (pipe body), 2
...Flange, 4...Filler pipe, 11...Mold, 13...Body mold,
14... Operating mold, 15... Hydraulic cylinder, 16... Slide bin, 17...
...concave groove, 18...blow pin, A...
Near the 7th lunge of the filler pipe.

Claims (1)

[Claims] Inside a split mold with grooves formed on its inner surface, a parison of synthetic resin is blow-molded to create a hollow body with grooves, and then the grooves of the hollow body are pressed and melted by the operation of the mold. A method for manufacturing a flanged synthetic resin filler pipe, characterized in that the pipe is made of synthetic resin.