JPH05305651A - Production of resin fuel tank having buffle - Google Patents

Abstract

PURPOSE:To produce a resin fuel tank having a buffle by a reduced number of processes without reducing the inner volume to a large extent as compared with a conventional container having no buffle even when the buffle is provided in the tank by integral molding and using a core material. CONSTITUTION:Freely protruding and retreating slide cores 35 are provided to the mutually opposed opening parts 32a, 32b of a mold 31 and cooling pipes 40 freely slidable in the moving direction of the slide cores 35 are provided to the slide cores 35 and a parison 45 is provided in the mold 31 to be expanded and the cooling pipes 40 and the slide cores 35 are simultaneously moved into the mold 31 to be welded to the parison and only the slide cores 35 are slid to the outside of the mold 31 and, at the time of the curing of a resin after blow molding, a cooling medium is passed through the cooling pipes 40 to cool buffle parts and, thereafter, the cooling pipes 40 are slid to the outside of the mold 31 to mold the buffle parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a resin fuel tank with a baffle suitable for use as a vehicle fuel tank, a transportation container, etc.

[0002]

2. Description of the Related Art Plastic tanks of various structures have been proposed for automobile gasoline, kerosene, and other liquids. In particular, in the case of a tank used as a fuel tank for an automobile, the fuel in the tank may greatly swing due to turning, sudden start, sudden braking, etc. of the vehicle, and a rocking noise may occur.

Further, due to the fluctuation of the fuel, the indication of the liquid level gauge fluctuates, the detection accuracy is lowered, and static electricity is further generated. In particular, various improvements have been proposed regarding the structure of the fuel tank for damping the rocking noise.

An example of a fuel tank with a baffle according to this prior art is shown in FIGS. 6 and 7. As shown in these drawings, two pairs of baffle portions 4a, 4b, 5a, 5b are projected inwardly from the pair of side walls 2, 3 of the tank body 1, and the side walls 2, 3 are inwardly disposed in each baffle portion. It is formed in a concave shape and has a substantially trapezoidal shape. In order to integrally form the baffle portions 4a, 4b, 5a, 5b at the time of blow molding, as shown in FIG. 7, baffle protrusions 7, 7a are used in a part of the mold.

The present applicant has already applied for a method of manufacturing a resin fuel tank with a baffle. As shown in FIG. 8, this is bent in the mold to bend the baffle parts 4a, 4a.
b, 5a, 5b core cooling pipes 6, 6 are provided so that at least one end projects out of the mold, the fuel tank parison is inserted into the mold to expand the parison, and the cooling pipes 6, 6 is moved inward of the mold to form the baffle portions 4a, 4b, and when the resin is cured after blow molding, a cooling medium is passed through the cooling pipes 6, 6 to baffle portions 4a, 4b, 5a, 5b is hardened and the baffle portion 4a, while leaving the cooling pipes 6, 6 in the baffle portion,
There is one for molding 4b, 5a, 5b.

[0006]

By the way, in the method for manufacturing the resin fuel tank with the baffle shown in FIGS. 6 and 7, the baffle 4 formed by the baffle protrusions 7 and 7a.
Since a, 4b, 5a and 5b have a tapered shape in terms of strength and molding and have a considerable thickness, the internal volume thereof is significantly reduced as compared with a conventional fuel tank without baffles. There is a problem.

Further, in the method for manufacturing the resin fuel tank with the baffle shown in FIG. 8, the cooling pipes 6, 6 are provided in the baffle portion.
Since the baffle portions 4a, 4b, 4c, 4d are formed while leaving the above, it is sufficient for reinforcing the baffle portion, but the cooling pipes 6, 6 are connected to the baffle portions 4a, 4b, 4c,
The installation method is very complicated to install on the 4d, and when the cooling pipes 6 and 6 are used as the core material of the baffle portions 4a, 4b, 5a, 5b, the number of parts is increased and the mounting man-hours are required. There was a point.

The present invention has been made by paying attention to the above-mentioned circumstances, and it is an object of the present invention to provide a baffle portion integrally formed in a tank with a large internal volume as compared with a conventional tank without a baffle. It is an object of the present invention to provide a method for manufacturing a resin fuel tank with a baffle, which can reduce the number of steps because the core material is not used.

[0009]

In the method for manufacturing a resin fuel tank with a baffle according to the present invention, slide cores for molding the baffle portion of the fuel tank are provided at the portions of the mold facing each other so as to project and retract. This slide core is provided with a cooling pipe that is slidable in the moving direction of the slide core,
The fuel tank parison is inserted into the mold inside the mold, and the parison is expanded, and at the same time, the cooling pipe and the slide core are moved inward toward the mold to form a baffle portion of the fuel tank. After fusing the upper and lower baffle parts, the slide core was slid outward while leaving the cooling pipe, and when the resin was cured after blow molding, a cooling medium was passed through the cooling pipe to cool the baffle part. After that, the cooling pipe is slid to the outside of the mold to form the baffle portion.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 2, the resin fuel tank 20 with a baffle is integrally molded by blow molding using a resin, and is inward from the opposite side walls (showing the upper and lower walls in the figure) 22a and 22b. Baffle part 23
The tips a and 23b are provided by lightly welding and joining the tips. The baffle portions 23a and 23b are made of blow-molded resin and joined together, and the thickness thereof is thin. A method for manufacturing this baffled resin fuel tank will be described below.

As shown in FIG. 1, openings 32a, 32 are formed on the opposite side walls 31a of a pair of molds 31 so as to face each other.
b is formed. A slide core 35 is provided in each of the openings 32a and 32b so as to be capable of projecting and retracting in the mold 31. These slide cores 35 are the baffle section 2
3a and 23b are formed, and are formed to have a gradually narrower width and a thinner wall toward the tip.
Three cooling pipes 40 penetrate through a. These cooling pipes 40 are composed of double tapered circular pipes and are slidable in the moving direction of the slide core 35.

As shown in FIG. 1, after the heated parison 45 (plastics or the like plasticized in a heating cylinder (not shown)) is provided in the mold 31, the parison 45 is heated as shown in FIG. The parison 45 is clamped in a mold, and air is then fed to expand the parison 45 to obtain a desired tank shape.

The parison 45 is expanded, and the slide core 35 and the cooling pipe 40 are connected to the opening 32a,
32b, 33a and 33b are projected at the same time, and
(A) As shown in FIG. 4 (a), after contacting the parison 45 and fusing the tips of the baffle portions 23a and 23b together, the blowing of air is stopped.

Next, as shown in FIGS. 3B and 4B, only the slide core 35 is slid to the outside of the die 31. Then, as shown in FIGS. 3 (c) and 4 (c), when the resin is cured after the blow molding, the residual air pressure causes the fuel tank 2
The upper and lower baffle portions 23a and 23b of 0 are formed.

Then, water as a cooling medium is introduced into the cooling pipe 40 to sufficiently cool and cure the resin in the baffle portions 23a and 23b. Baffle part 23 formed at this time
Since the resin layers a and 23b are extremely thin, the cooling efficiency is good.

After the predetermined cooling is completed, the cooling pipe 40 is finally slid back to complete the manufacturing process of the baffle portions 23a and 23b of the fuel tank 20. That is, there is no core material in the baffle portions 23a and 23b, and the holes 50 are formed in the shape of the cooling pipe 40 as shown in FIG. These baffle portions 23a and 23b have sufficient strength as baffles for the fuel tank. In addition, since the baffle portions 23a and 23b can be formed thinner than the conventional one, the internal volume is not significantly reduced as compared with the tank without the baffle. Further, since the fuel tank and the baffle portion can be integrally formed by the blow molding without using the core material, there is an advantage that the molding cost is low.

[0017]

Since the method of manufacturing the resin fuel tank with the baffle of the present invention is configured as described above, even if the baffle portion is integrally formed in the tank, the internal volume is significantly larger than that of the conventional tank without the baffle. There is no reduction. Moreover, since no core material or the like is used, the number of parts can be reduced, and the manufacturing method can be simplified, so that the number of steps can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a method of manufacturing a fuel tank with a baffle according to an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of the fuel tank with a baffle according to the embodiment.

3 (a), (b) and (c) are operation explanatory views of the method for manufacturing the fuel tank with the baffle of the same embodiment.

4 (a), (b) and (c) are operation explanatory views of the method for manufacturing the fuel tank with the baffle of the same embodiment.

FIG. 5 is a sectional view of the baffle of the fuel tank with a baffle of the same embodiment.

FIG. 6 is a perspective view of a conventional fuel tank with a baffle.

FIG. 7 is a sectional view of a baffle portion of a conventional fuel tank with a baffle.

FIG. 8 is a partially cutaway perspective view of a conventional fuel tank with a baffle.

[Explanation of symbols]

23a, 23b ... Baffle part, 31 ... Mold, 35 ... Slide core, 40 ... Cooling tube, 45 ... Parison.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B65D 1/02 D 7445-3E 25/02 B 6540-3E // B29L 24:00 4F

Claims (1)

[Claims] 1. A parison for a fuel tank is provided in a mold,
In a method of manufacturing a tank in which a resin fuel tank with a baffle is integrally formed by blow molding, a slide core for molding a baffle portion of a fuel tank is provided in a mutually opposing portion of the mold so as to project and retract.
The slide core is provided with a cooling pipe slidable in the moving direction of the slide core, the fuel tank parison is inserted into the mold, the parison is expanded, and the cooling pipe and the slide core are connected to each other. At the same time to move inward of the mold to form the baffle part of the fuel tank, and after fusing the upper and lower baffle parts, slide the slide core outside the mold leaving the cooling pipe, and after blow molding. When the resin is cured, a cooling medium is passed through the cooling pipe,
A method for manufacturing a resin fuel tank with a baffle, comprising cooling a baffle portion and then sliding a cooling pipe to the outside of the mold to form the baffle portion.