JPS6227131A - Manufacture of reserve tank - Google Patents

Abstract

PURPOSE:To enable to manufacture a reserve tank by the minimum post processing, by forming an air relied space on the upper part of a joint of a piping hose. CONSTITUTION:A tank body 11 of a reserve tank 10 and a joint 13 of a piping hose protruded from the lower part of the tank body 11 in an L-shaped state are molded unitarily through blow molding. In this instance, when an air relief space 15 is formed unitarily on the upper part of the joint of the piping hose, as blowing air is sent into the space 15, the joint 13 of the piping hose can be penetrated through without generating a thick part on the same. The reserve tank 10 is finally cut off from a neck part 19 of a pipe 14 through machining. The reserve tank manufactured in this manner is communicated with the tank body 11 through a communication hole 18. Then as for the outside diameter of the air vent space 15, it is most suitable to enlarge the same to the extent of 50% of the outside diameter of the pipe 14.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical field of the invention The present invention relates to a method for manufacturing a reserve tank that integrally has a connection part for a piping hose that connects to a radiator or water jacket of an engine installed in an automobile. It is.

(Example) Conventional technology and problems Conventionally, this type of reserve tank has been manufactured by blow molding.

As for blow molding, for example, the description on pages 221 to 225 of "Plastic Reader" edited by Osaka Petition Industrial Research Institute, Plastic Technology Association, and published by Plastic Age,
Or Shunsuke Murahashi, Ryohei Oda.

It is known from the description on page 731 of ``Plastic Handbook J'' edited by Minoru Imoto and published by Asakura Shoten.

As the reserve tank, for example, those shown in FIGS. 5 to 8 are known.

The manufacturing method shown in FIGS. 5 and 6 involves forming a tank body a by blow molding, and then inserting a separately prepared piping hose into a hole provided at the bottom of the tank body a, which is bent into an almost L-shape. The pipe C is inserted and welded.

In this manufacturing method, the tank body a and the pipe C for joining the piping hose are manufactured separately and then welded together, which is undesirable because the manufacturing process increases. Furthermore, when the pipe C for connecting the piping hose is attached, there is a possibility that the orientation thereof may be uneven.

The manufacturing method shown in FIGS. 7 and 8 is a method in which a tank body a and a pipe C for connecting a plumbing hose, which is bent into an approximately L-shape and protrudes from the lower part of the tank body a, are integrally connected by blow molding. be.

According to this manufacturing method, the tank body a and the piping hose connection vibe C can be manufactured integrally, so that
Compared to the manufacturing method shown in the figure, there are fewer manufacturing steps and it is simpler.

However, in this manufacturing method, the pipe hose joining vibe C
The parison that has reached the shaft portion d of the parison is welded at its end e, forming a lump of flesh, and the end e of the connecting vibe C for piping hose is closed. Therefore, it was necessary to perforate the end portion d by machining after blow molding. This post-processing makes the reserve tank manufactured by this manufacturing method expensive.

(c) Purpose of the Invention The present invention has been made to solve the problems of the prior art, and its purpose is to manufacture a reserve tank with minimal post-processing.

2) Structure of the Invention In order to achieve the above object, the method for manufacturing a reserve tank according to the present invention includes integrally forming a tank body and a piping hose connection portion protruding from the lower part of the tank body in an L-shape by blow molding. When molding, an air escape space is integrally formed in the upper part of the pipe/hose joint.

(k) Function In the present invention, since the air is blown into the air escape space, it penetrates the piping hose joint without forming any buildup.

(f) Examples of the invention Embodiments of the present invention will be described below based on the drawings.

First, as shown in FIG. 1, a parison 1 at 200[deg.] C. is placed in a mold 2 of a blow molding machine (Nitahara BUI - Lancer type), and then the mold is clamped at a speed of 0.15H.

Next, air is supplied from the portion 3 corresponding to the water inlet 12 of the reserve tank 10 at approximately 3.5 kg/m to '7 kg/rd.
Blow at a blowing timing of 0.3 H within the range of ■
-■-■-■-■ Complete the blowing route.

The blowing time at this time is 31■(.In addition, ■,■.

Some air is left in the parts (2) and (2), for example, by preliminary air at a mold clamping speed of 0, 1, 5H and a blow pressure of 1.5 kg/rrr.

Then, by blowing air into the part (2), a space is created inside the pipe 14 of the piping hose joint 13.

Furthermore, since an air escape space 15 is formed in the upper part of the vibrator 14, the parison 1 contacts the molding die 2 at the upper part of the vibrator 14 and tries to weld, but the air escapes into the air escape space 15. to avoid occlusion in that area.

Here, if there is no air escape space 15, the following problems will occur. If the parison 1 comes into contact with other parts during this molding process, it will be welded. Therefore, even if blowing air is introduced after heat fusing using thermoplastic resin, the hole will not pass through as it will remain thick. Therefore, by blowing air into the air escape space 15 before contact, such a problem can be solved.

Finally, the semi-finished reserve tank integrally provided with the air escape space 15 is cut by machining from the neck portion 19 of the vibrator 14 to form a reserve tank with an external shape as shown in FIGS. 3 and 4. It is assumed to be 1.0.

The reserve tank according to this example manufactured in this way is as follows:
As shown in FIG. 2, the root portion 1 of the piping hose joint 14
7 is connected to the tank body 11 through a communication hole 18 with a hole diameter of 10.
It communicates with A vibrator 14 having an outer diameter of 8φ and a neck portion 19 having an outer diameter of 9φ is connected to the upper part of the root portion 17, and an air escape portion 15 having an outer diameter of 12φ and a length of 15 mm is formed at the upper part. ing. An opening 20 having a hole diameter of 3φ is formed in the upper part of this air escape space 15.

In the present invention, it has been confirmed through experiments by the inventors that the optimum outer diameter of the air escape space 15 is approximately 50% larger than the outer diameter of the vibrator 14.

Of course, the molding conditions and sizes in the above embodiments are merely examples, and can be arbitrarily set depending on the purpose and use.

The mold 2 shown in Fig. 1 is provided with many cooling water grooves as in conventional blow molding molds. However, it is not particularly limited.

(G) Effects of the Invention As described above, according to the present invention, since the air escape space is formed in the upper part of the pipe hose joint, air can be sent to the air escape space before the parison is welded, and the pipe can be penetrated.

Therefore, the reserve tank can be manufactured with minimal post-processing such as cutting the end of the pipe.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a method for manufacturing a reserve tank according to the present invention, FIG. 2 is an explanatory diagram showing a forming process of a pipe hose joint, and FIG. 3 is a front view of a reserve tank manufactured according to the present invention. Fig. 4 is a side view of the tank, Fig. 5 is an external view of a conventional reserve tank, Fig. 6 is an enlarged view showing its main parts, Fig. 7 is an external view of another conventional example, and Fig. 8 is its appearance. It is an enlarged view showing the main part. DESCRIPTION OF SYMBOLS 1... Parison, 2... Molding mold, 10... Reserve tank, 11... Tank body, 13... Piping hose joint, 14... Pipe, 15... Air escape space . Patent applicant: Japan Radiator Co., Ltd. Figure 1 Figure 3 Figure 4 Figure 6 Figure 8

Claims (1)

[Claims] A reserve characterized in that when a tank body and a piping hose joint protruding in an L-shape from the lower part of the tank body are integrally molded by blow molding, an air escape space is integrally formed in the upper part of the piping hose joint. How to make a tank.