JPS6237123A - Manufacture of fuel tank made of synthetic resin - Google Patents

Abstract

PURPOSE:To make post processing unnecessary by finishing the inside diameter of a pouring port at a time, by a method wherein a mold is mounted so that a shaping inner wall becomes long lengthways, a side part of parison is placed between a mold and blow molding is performed by driving a blowing nozzle into a part placed between the mold. CONSTITUTION:A mold 11 is opened and a parison 2 is made to position in the mold. The position of the parison 2 is so constituted that a part of the prison 2 is placed slightly between parting line parts when the mold 11 is clamped. Then a blowing nozzle 14 is inserted into a blowing nozzle insertion hole 12 by clamping the mold 11. As the part of the parison 2 is held between the parting line parts, the tip of the blowing nozzle 14 is driven into the parison by so constituting that a tubular member is formed. When air blow is performed, the part of the parison 2 is held between the external circumferential surface of the blowing nozzle 14 and an inner circumferential surface of the blowing nozzle insertion hole 12 under pressure, a fuel tank 16 is molded through blowing and a pouring port 17 whose inside diameter has been finished is molded at a time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a synthetic resin fuel tank having six pressure inlets on the round side in the long side direction.

[Prior Art] Metal has conventionally been used in fuel tanks of passenger cars and the like. The fuel tank at the other end of the above is made by seam welding two metal plates that have been given a shape by press forming to create an intangible shape, and the evaporative pipe, preserver vibe, fuel inlet, etc. are attached by post-welding. So, set these as desired,
It can be placed anywhere.

However, it has drawbacks such as being heavy, prone to corrosion, and having little freedom in shape. Therefore, development of expanded resin fuel tanks that are lightweight, non-corrosive, and have a high degree of freedom in shape has become active.

[Problem that the invention seeks to solve]

By the way, in recent years passenger cars have become more diverse and the shapes of fuel tanks have become more complex, and it has become desirable to install all the fuel inlets on the long side of the tank. The fuel tank has the disadvantage that the pressure inlet must be installed on the +4 short side.

This is because during blow molding, the long side is usually vertical, and the blow nozzle that blows air is installed on the top or bottom of the mold, and that part becomes the injection port. It is et al. That is, when blow molding, if the long side of the product is horizontally elongated, the mold lK@
-In addition, the folding diameter of the parison 2 has to be increased, and the die 3 is also increased accordingly9, which increases the cost of the apparatus. Furthermore, since the long upper and lower pinch-off parts 4.4 of the mold 1 pinch the high-intensity steel 3, a large amount of paris is generated, which increases the crushing cost for paris regeneration and increases the crushing loss. .

In the case where the fuel inlet is arranged in the vertical direction and the fuel inlet is provided on the side surface in the long side direction, as shown in Fig. 4, the can type 1
A 9-air passage 5 is provided to introduce the air for blowing into the tank, and the parison 2 is held between the parisons 2 and 2, and air is blown through the blow nozzle 6 to form the mold.After fc, gold 11! Remove from x, air passage of tank! 7
It is also conceivable to cut the diameter of the hole as appropriate to form an injection port. In this case as well, since it is necessary to increase the fold diameter of the parison 2, the die is large and expensive, and a large amount of paris is generated, which increases the grinding cost for parison regeneration and increases the grinding loss. Furthermore, synthetic resin fuel tanks have less rigidity than metal tanks, so when connecting a filler vibe to the injection port, it is necessary to insert a fitting inside to prevent deformation. In a 7'C fuel tank molded using the mold 1 shown in Fig. 4, it is necessary to finish the inner diameter of the injection port by post-processing so that it corresponds to the new curved contour of the metal fitting.

The present invention has been developed based on the above-mentioned circumstances, and a blow nozzle is driven into the long side of the mold at the position where the injection port is formed, with the long side direction being vertical, and the inner diameter of the injection port can be finished at the same time as blow molding. The object of the present invention is to provide a method for manufacturing a resin fuel tank.

[Problems to be solved by the invention] The present invention has been made to achieve the above objects,
The gist is that a mold is set up so that the shaping inner wall is vertically elongated, the sides of the parison are sandwiched between the molds, and a blow nozzle is driven into the nrc part of the sandwich to blow-mold the parison resin pear fuel. The tank manufacturing method.

[Specific structure and operation of the invention]

The invention will now be explained with reference to Figure Ikl.

Figure 1 is a hemostatic diagram showing one example of the mold 11 used in the entire method of the present invention. A blowing nozzle insertion hole 12 is provided in the longitudinal parting line portion of the mold 11 . In addition, when the mold 11 is closed, the nozzle insertion hole 12 is driven by an operating hydraulic cylinder 13 at a position opposite to the blow nozzle insertion hole 12 formed in the tube-ting line portion. A blowing nozzle 14 that can be inserted into or pulled out
is provided. This blowing nozzle 14 has a ridge portion 14a.
is provided, and when inserted into the blow nozzle insertion hole 12,
This is to be pressed.

Using this gold base 11; t1! To blow mold the tank, first, place the parison 2 between the two holes. A part of the installed parting line mK bar IJ7 is slightly clamped.Next, the mold 11 is closed, the hydraulic cylinder 13 for operation is turned on, and the blowing nozzle 14 is used to blow the air. Insert it into the nozzle insertion hole 12. At this time, the tip of the blowing nozzle 14, which is held by a part of the parison 2 at the parting line part>'NN13jJi2 t2
4, a part of the parison 2 is inserted into the inside of the parison 2 so as to form a tubular body. Next, when air blowing is performed, the parison 2 is held under pressure between the outer circumferential surface of the cavity 15 - wide 14 and the inner circumferential surface of the blow nozzle insertion hole 12, and the fuel tank 16 is blow-molded and the inner diameter is A finished inlet 17 is molded at the same time.

After cooling and solidifying, the mold 14 is opened, the fuel tank is taken out, and the paris is removed, so that the filler pipe fitting can be attached without any similar post-processing. Further, the amount of chips generated without increasing the size of the die is slightly increased compared to the scraps generated by the upper and lower pinch-off parts 4.4, but the amount of increase is small and is not much different from the case of the conventional method.

[Effect] As described above, the method of the present invention has the advantage that the long side direction 1 of the mold
Since a fuel tank having a fuel inlet can be easily blow-molded on illrkU and the inner diameter of the inlet can be finished at the same time, no post-processing is required. Furthermore, without increasing the size of the die, the increased value of Paris is also small, which reduces the cost increase of synthetic resin fuel tanks.

Figures 1 and 2 are front views of one side showing an example of a mold for carrying out the method of the present invention; Figure 1 shows the positional relationship between the mold and the parison, Figure 2 shows the blow molded fuel tank, and Figure 3 shows the relationship between the mold and the parison when the long side is oriented horizontally. 4 are explanatory diagrams of a mold in a case different from the present invention in which the long side direction is set vertically and the injection port is provided on the long side side surface.

2...Parison, 4...Pinch-off part, 11...Mold, 12...Blow nozzle insertion hole, 13...For operation Hydraulic cylinder, 14.
...Blow nozzle% 14a ... Ridge section,
15...Cavity, 16...Fuel tank, 17...Injection hole.

Claims (1)

[Claims] A synthetic resin fuel characterized in that a mold is installed so that the shaping inner wall is vertically elongated, the sides of the parison are sandwiched between the molds, and a blow nozzle is driven into the sandwiched part to perform blow molding. How to make a tank.