JPH06134801A - Molding method for inlet shield - Google Patents

Abstract

PURPOSE:To prevent that a shift of an insert at the time of molding may cause a impairment of a design or a difficult mounting of an inlet shield on a body. CONSTITUTION:An insert 11 is disposed in a cavity formed by a mold 13 for molding an inlet shield. At this time, the insert 11 is placed on a projection 17 of a stationary mold 14. A melted blend is injected from a gate 18. The gate 18 is disposed higher than the upper surface of the insert 11 placed on the projection 17. Therefore, when the melted blend is injected from the gate 18, the insert 11 is stressed by the melted blend so as to come into contact with the stationary mold 14 through the projection 17. A stress to separate the insert 11 from the stationary mold 14 is hardly applied to the insert 11. Therefore, there is no possibility that the insert 11 may shift from the originally set position with the injection of the blend.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inlet shield capable of supplying fuel from an oil supply port on a flange portion side to an oil supply pipe connected to a tubular portion, and more specifically, it has rigidity at least inside a flange portion. The present invention relates to a method for forming an inlet shield in which an insert is embedded.

[0002]

2. Description of the Related Art Conventionally, this type of inlet shield is
It has a cylindrical portion and a flange portion. An oil supply pipe communicating with the fuel tank is connected to the tubular portion, and the flange side serves as an oil supply port. The inlet shield is attached and fixed to the body by tightening a bolt or the like at the flange portion. As a result, the gap between the oil supply pipe and the body opening is sealed by the inlet shield.

Generally, a metal insert is embedded inside the flange and the vicinity thereof. The insert shield improves the mounting rigidity of the inlet shield.

FIG. 6 is a sectional view showing a part of an inlet shield molding die, that is, a part forming a flange portion of the inlet shield. As shown in the figure, a cavity 24 having the shape of an inlet shield is formed by a mold 23 including a fixed mold 21 and a movable mold 22. The fixed mold 21 is formed with a plurality of protrusions 25 (one in the figure) projecting inward (upward in the figure) of the cavity 24. Further, the fixed mold 21 is formed with a gate 26 opening to the cavity 24. This gate 26
It is formed so as to face the mold splitting surface PL. Further, the mold dividing surface PL substantially corresponds to the lower surface of the flange portion for convenience of molding.

When molding the inlet shield using the mold 23, the insert 27 is first installed in the cavity 24. At this time, insert 27
Is placed on the protrusion 25 of the fixed mold 21. And
The molten polymer material is injected from the gate 26 and filled in the cavity 24. After that, the polymer material is cooled and solidified, and the solidified product is taken out from the mold 23 to obtain an inlet shield.

[0006]

However, in the above-mentioned conventional technique, the mold dividing surface PL substantially corresponds to the lower surface of the flange portion, and the gate 26 is formed so as to face the mold dividing surface PL. . That is, in FIG.
Since the polymer material is injected from the lower side of the cavity 24 forming the flange portion, the insert 2 placed on the protrusion 25 is accompanied by the injection of the polymer material.
There was a possibility that 7 was pushed up by the polymer material. Therefore, when the filling of the polymer material is completed, as shown in FIG. 7, the insert 27 moves to the upper part of the drawing, that is, to the filler port side, and thus, a part of the insert 27 is filled on the filler port side (design surface There was a risk of being exposed to the side). As a result, the designability may be impaired.

Further, when the insert 27 is displaced from the original installation position, the tightening bolt hole formed in the insert 27 and the bolt hole (both not shown) of the flange portion are displaced. I will end up. As a result, one of the bolt holes may be blocked, and it may be impossible to attach the inlet shield with a bolt.

The present invention has been made in order to solve the above problems, and its purpose is to prevent the design from being deteriorated due to the displacement of the insert during molding and to make it difficult to mount the body. Another object of the present invention is to provide a method for forming an inlet shield capable of preventing the above.

[0009]

To achieve the above object, the present invention comprises a tubular portion and a flange portion extending from the tip of the tubular portion toward the outer periphery, and at least the inside of the flange portion. A method for forming an inlet shield in which a rigid insert is embedded, and the flange side is used as a fuel supply port, and fuel can be supplied from the fuel supply port to a fuel supply pipe connected to the tubular portion, which is fixed or movable. A step of installing the insert so as to directly or indirectly contact the fixed mold or the movable mold in a cavity formed by a mold having a mold; and the cavity formed in the fixed mold or the movable mold. Of these, a process of injecting a molten polymer material from a gate that is open to the filler opening side of the insert to fill the polymer material into the cavity. When, after solidifying the polymeric material, and further comprising the step of taking out the one obtained by the solidification from the mold and its gist.

[0010]

According to the above construction, the insert is installed in the cavity so as to directly or indirectly contact the fixed mold or the movable mold. Then, the melted polymer material is injected from the gate opening to the cavity to fill the cavity. Then, after the polymer material solidifies,
The solidified product is taken out of the mold to form the inlet shield.

Here, the gate is opened in the cavity closer to the filler port than the insert. Therefore, when the molten polymer material is injected from the gate, the insert is subjected to stress in the direction in which the polymer material directly or indirectly contacts the fixed die or the movable die. In other words, the insert experiences little stress in the direction away from its installed mold. Therefore, the insert does not deviate from the initially installed state due to the injection of the polymer material.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment embodying the present invention will now be described with reference to FIGS.
It will be described based on 5. As shown in FIG. 4, a fuel filler port 2 is provided at the rear of the vehicle 1. More specifically, as shown in FIG. 5, a part of the body 3 at the rear of the vehicle 1 is opened, and an inlet shield 4 is attached to the opening. The inlet shield 4 includes a tubular portion 5 whose one end is bent inward, and a flange portion 6 extending from the tip (left end in the figure) of the tubular portion 5 toward the outer peripheral direction. The inlet shield 4 is made of a blend of polyvinyl chloride (PVC) and nitrile rubber (NBR). The flange portion 6 side of the inlet shield 4 serves as the fuel filler port 2.

An oil supply pipe 7 shown by a dashed line in FIG. 2 is connected to the tubular portion 5 so as to communicate with a fuel tank (not shown). A cap 8 shown by a two-dot chain line is also fastened to the tip of the oil supply pipe 7. Further, a drain port 9 for draining water is formed in the tubular portion 5, and the water in the inlet shield 4 is drained to the outside of the vehicle through the drain port 9. The inlet shield 4 is tightened with a bolt (not shown) at the flange portion 6 so that the body 3
It is attached and fixed in contrast. The fuel filler port 2 is provided with a lid 10 that is substantially flush with the body 3. When refueling is not performed, the lid 10 is closed and the refueling port 2 is closed.

An insert 11 made of a zinc steel plate is embedded inside the flange 6 and the vicinity thereof. The insert 11 is formed with a ridge 12 for increasing the rigidity of the insert 11 itself. And
The insert 11 improves the mounting rigidity of the inlet shield 4.

Next, a mold used for molding the above-mentioned inlet shield 4 will be described. FIG. 1 is a cross-sectional view showing a part of a die 13 forming the flange portion 6 of the inlet shield 4. Further, FIG. 2 shows A of FIG.
FIG. As shown in these figures, mold 1
3 includes a fixed die 14 and a movable die 15. And
A cavity 16 in the shape of the inlet shield 4 is formed by both molds 14 and 15. The fixed mold 14 is formed with a plurality of protrusions 17 (one in the figure) projecting inward of the cavity 16 (upward in the figure).

Further, the fixed mold 14 is formed with a gate 18 opening to the cavity 16. In the gate 18 and the portion in the vicinity thereof, the mold split surface PL is formed on the upper side as compared with the other portions, and the gate 1
8 is formed so as to face the mold split surface PL. More specifically, the gate 18 is the insert 1 that is mounted on the protrusion 17 in the molding process described later.
1 is located above the upper surface. Since the uppermost surface on the fuel filler port 2 side is the design surface of the inlet shield 4 which is a molded product, the gate 18 is formed lower than the design surface, and only the gate 18 is formed with a small R shape at the end. The inlet shield 4 having excellent design is obtained.

Next, the operation of molding the inlet shield 4 using the mold 13 will be described. First, as shown in FIG. 1, the insert 11 is installed in the cavity 16. At this time, the insert 11 is placed on the protrusion 17 of the fixed mold 14.

Then, the melted blend is injected from the gate 18. At this time, as described above, the gate 18 is the insert 1 mounted on the protrusion 17.
1 is located above the upper surface. Therefore, as shown in FIG. 3, when the melted blended material is injected from the gate 18, the insert 11 is in a direction in which the blended material comes into contact with the fixed mold 14 through the protrusion 17 (downward in the figure). Receive stress. In other words, the insert 11
Receives almost no stress in the direction away from the installed fixed mold 14. Therefore, the insert 11 will not be displaced from the initial installation state due to the injection of the blended product.

After that, the injection of the blended material is continued for a predetermined time, so that the blended material is filled in the cavity 16 without the insert 11 being displaced from the initial installation state.

Then, the blended product is cooled and solidified, and the solidified product is taken out from the mold 13,
The inlet shield 4 described above is obtained. As described above, according to the method for forming the inlet shield 4 in this embodiment, the position of the gate 18 is provided above the upper surface of the insert 11. Then, when the melted blend is injected from the gate 18,
The insert 11 is in a direction in which the fixed mold 14 is brought into contact with the fixed mold 14 by the blended material, that is, the insert 11
The stress is applied in the direction in which is pressed. For this reason, the insert 1 will be used as the blend is injected and filled.
1 does not deviate from the initial installation state. Therefore, the protrusion 12 or the like of the insert 11 is not exposed on the filler opening 2 side (design surface side), and it is possible to prevent the designability from being impaired by the exposure of the insert 11. Further, since the insert 11 is not displaced from the initial installation position, the tightening bolt hole formed in the insert 11 and the bolt hole of the flange portion 6 (both not shown) are not displaced. Therefore, there is no possibility that one of the bolt holes will be closed due to the displacement of the insert 11, and the inlet shield 4 can be securely attached with the bolt at the time of attachment.

The present invention is not limited to the above-described embodiment, but may be implemented as follows with a part of the configuration appropriately changed without departing from the spirit of the invention. (1) In the above embodiment, the insert 11 is mounted on the protrusion 17 of the fixed mold 14, but it may be directly mounted on the fixed mold 14 or the movable mold 15.

(2) In the above embodiment, the gate 18 is formed on the fixed mold 14, but it may be arranged on the movable mold 15. (3) In the above-described embodiment, the protrusion 12 is formed to give the insert 11 rigidity, but the protrusion 12 may be omitted.

(4) In the above embodiment, a blend of PVC and NBR was used as the polymer material, but any material having thermoplasticity may be used.

[0024]

As described above in detail, according to the inlet shield molding method of the present invention, it is possible to reliably prevent the design from being lost due to the displacement of the insert and the difficulty of mounting the body. It has an excellent effect that it can.

[Brief description of drawings]

FIG. 1 is a sectional view showing a part of an inlet shield molding die in an embodiment embodying the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1 in one embodiment.

FIG. 3 is a partial cross-sectional view showing a state where the melted blended product is injected into the cavity of the mold of FIG. 1 in one embodiment.

FIG. 4 is a partial perspective view showing a rear portion of the vehicle in one embodiment.

FIG. 5 is a partial cross-sectional view showing the vicinity of a fuel supply port mainly including an inlet shield in one embodiment.

FIG. 6 is a cross-sectional view showing a part of an inlet shield molding die in the prior art.

7 is a partial cross-sectional view showing a state in which a molten polymer material is injected and filled in the cavity of the mold of FIG. 6 in the prior art.

[Explanation of symbols]

2 ... Refueling port, 5 ... Cylindrical part, 6 ... Flange part, 7 ... Refueling pipe, 11 ... Insert, 13 ... Mold, 14 ... Fixed type, 1
5 ... Movable type, 16 ... Cavity, 18 ... Gate.

Claims (1)

[Claims] 1. A tubular portion (5) and a flange portion (6) extending from the tip of the tubular portion (5) toward the outer periphery are provided, and at least the inside of the flange portion (6) has rigidity. An insert (11) is embedded, and a fuel supply port (2) is provided on the side of the flange portion (6), and fuel is supplied from the fuel supply port (2) to an oil supply pipe (7) connected to the tubular portion (5). A possible inlet shield molding method, comprising a mold (1) having a fixed mold (14) and a movable mold (15).
3) installing the insert (11) in the cavity (16) formed by 3) so as to directly or indirectly contact the fixed mold (14) or the movable mold (15); (14) or the movable mold (15), the insert (11) of the cavity (16)
A step of injecting a molten polymer material from a gate (18) that is open to the fuel filler port (2) side to fill the polymer material into the cavity (16); And then removing the solidified product from the mold (13).