JP6807136B2 - How to install built-in parts of blow molded products - Google Patents

Description

The present invention relates to a method of attaching an internal part of a blow-molded product to which an internal component is attached to the inside of an outer wall of a blow-molded product formed of a synthetic resin by a blow-molding method using a blow-molded mold.

Conventionally, a hollow blow-molded product, for example, a fuel tank for an automobile or the like, has been made of metal, but in recent years, the weight of the vehicle has been reduced, rust does not occur, and a desired shape has been used. Hollow thermoplastic synthetic resin has come to be used because it is easy to mold.

In the production of hollow products made of thermoplastic synthetic resin, a blow molding method has been often used because of the ease of molding a hollow body. In the blow molding method, a parison of a molten thermoplastic synthetic resin member is formed into a cylindrical shape and extruded from above, the parison is sandwiched between molds, and air is blown into the parison to manufacture a hollow body.

On the other hand, also in the blow molding method, it may be required to provide a blow molded product, for example, a built-in component such as a valve or a baffle plate for suppressing the flow noise of fuel inside the fuel tank.
Therefore, when the built-in parts are provided inside the blow-molded product, a manufacturing apparatus as shown in FIG. 19 is used (see, for example, Patent Document 1). The built-in component 110 is held in the cavity of the blow molding die 120 by the built-in component holding rod 141, the parison 8 is lowered, and then the built-in component 110 is sandwiched by the slide core 126 to hold the built-in component 110 in the blow molding die 120. Is closed, and the parison 8 is sandwiched between the pinch plates 135 to form a blow-molded product.

Further, when the blow-molded product becomes large or when a plurality of built-in parts are attached, as shown in FIGS. 20 and 21, the parison 8 is divided into two pieces, and each blow-molded split mold 221 is used. There is one that holds the parison 8 in the opposite portion of the cavity 222 (see, for example, Patent Document 2).

The built-in component 210 is attached to the blow molding core mold 230, and the blow molding core mold 230 is inserted between the two parisons 8. Then, after the parison 8 is brought into close contact with the cavity 222 of the blow molding split mold 221, the slide cylinder 231 to which the built-in component 210 is attached is slid, and the built-in component 210 is pressed against the surface of the parison 8 to be attached.

Then, as shown in FIG. 22, a built-in component mounting hole 211 is formed on the surface of the built-in component 210 facing the parison 8, and the push pin 240 is moved in the direction of the arrow in FIG. 22 to move the push pin 240 from the built-in component mounting hole 211 to the parison. After entering 8 and pulling out the push pin 240, the fixing pin 232 of the slide cylinder 231 is moved in the direction of the arrow in FIG. 22, and the entered parison 8 is pressed in a dish shape while being melted to attach the built-in component 210. ing.

However, in this case, it is necessary to manage the positions of the push pin 240, the fixing pin 232, and the built-in component mounting hole 211 of the built-in component 210 without deviation. It is also necessary to control the shape and wall thickness of the molten dish-shaped parison 8.
Further, since the push pin 240 needs to heat the parison 8 at a high temperature in order to evenly extend the uneven surface of the parison 8, the blow molding die itself generates heat, and it takes time to cool the blow molding die. , The molding cycle will be long,

Japanese Unexamined Patent Publication No. 9-174670 Japanese Patent No. 5026515

Therefore, according to the present invention, in the method of attaching the internal parts of a blow molded product for mounting the internal parts, the internal parts can be easily attached to the parison, the structure of the blow molding core mold is simple, and the blow having the internal parts is provided. An object of the present invention is to provide a method for attaching built-in parts of a molded product.

The present invention of claim 1 for solving the above-mentioned problems is a blow-molded product in which an internal component is mounted inside an outer wall of a blow-molded product formed of a synthetic resin by a blow molding method using a blow molding die. In the mounting method of built-in parts
The blow molding die is a blow molding die formed by dividing it into two parts at a parting line, and a blow molding core die located between the blow molding split die when the blow molding split die is opened. Have and
An internal component mounting hole for mounting the internal component is formed on the outer wall of the blow molded product in the internal component.
The blow-molded core mold is provided with a core part holding part for holding the built-in parts and a core mold suction part for sucking the parison.
Open the blow molding die with a parting line, adsorb the parisons into the cavities of the blow molding split dies on both sides, and place the blow molding core mold between the parisons adsorbed on the blow molding cots on both sides. Insert and
The built-in parts are held in the core part holding part of the blow-molded core mold so as to face the inner surface of the outer wall of the blow-molded product, and the blow-molded split mold or the blow-molded core mold is moved to be built-in. The part is brought into contact with the parison, the parison is sucked from the core mold suction part of the blow molding core mold via the built-in part mounting hole, and the parison sandwiches the circumference of the built-in part mounting hole to hold the built-in part. It is a method of attaching built-in parts of a blow-molded product, which is characterized by being attached to a blow-molded product.

In the present invention of claim 1, in the method of mounting the built-in parts of the blow-molded product, the built-in parts are mounted inside the outer wall of the blow-molded product formed of synthetic resin by the blow-molding method using a blow-molding mold. The blow molding die is a blow molding split die formed by dividing it into two parts at a parting line, and a blow molding core die located between the blow molding split die when the blow molding split die is opened. Have.

For this reason, it is possible to attach the built-in parts to the blow-molded core mold, insert the blow-molded core mold between the parisons adsorbed on the blow-molded split molds on both sides, and attach the built-in parts to the inner surface of the parison. it can. In the blow-molded split mold, since the cavity for forming the blow-molded product is formed on the opening / closing surface, the parison having the built-in component can be blow-molded by being shaped by the blow-molded split mold cavities on both sides.

The blow molding core mold of the blow molding mold is provided with a core mold component holding portion for holding the built-in parts and a core mold suction portion for sucking the parison. Therefore, the built-in parts can be held in the blow molding core mold, and the built-in parts can be brought into contact with the parison at the time of blow molding only by the blow molding core mold. The built-in part can be fixed by sucking the parison from the built-in part mounting hole by the core type suction part.

Open the blow molding die with a parting line, adsorb the parisons into the cavities of the blow molding split dies on both sides, and place the blow molding core mold between the parisons adsorbed on the blow molding cots on both sides. I inserted it. Therefore, the parison can be attracted to and held on the outer peripheral surfaces of the two blow-molded split molds and shaped, and the built-in parts can be attached to the inner surface of the parison.

The built-in parts are held in the core part holding part of the blow-molded core mold so as to face the inner surface of the outer wall of the blow-molded product, and the blow-molded split mold or the blow-molded core mold is moved to be built-in. Bring the part into contact with the parison. Therefore, even if the internal component is large during blow molding, the internal component can be easily brought into contact with a predetermined position on the inner surface of the parison and attached to a predetermined position on the outer wall of the blow molded product. Further, the built-in parts can be attached to the parison by simply attaching the blow molding core mold or the blow molding split die to the blow molding core mold, and the blow molding core mold can be attached to the parison. The structure of can be simplified.

The parison is sucked from the core mold suction part of the blow molding die through the built-in component mounting hole, and the parison sandwiches the circumference of the built-in component mounting hole to mount the built-in component on the blow molded product. Therefore, the built-in parts can be reliably attached to the outer wall of the blow-molded product formed by the parison only by suctioning the parison, and strict control of the positions of the parison, the built-in part mounting holes and the core type suction part is not required. Yes, there is no need to heat the parison.

According to the second aspect of the present invention, after sucking the parison from the core mold suction portion of the blow molding core mold via the built-in component mounting hole, the sucked parison is pressed to press the sucked parison to mount the built-in component mounting hole. It is a method of attaching the built-in parts of the blow molded product that sandwiches the circumference of the blow molded product with a parison.

In the present invention of claim 2, after sucking the parison from the core mold suction portion of the blow molding core mold via the built-in component mounting hole, the sucked parison is pressed to press the sucked parison to mount the built-in component mounting hole. Hold the circumference of the parison with a parison. For this reason, the pressed parison is in close contact with the periphery of the built-in component mounting hole, and the parisons on both sides of the built-in component mounting hole can strongly pinch the periphery of the built-in component mounting hole, making the built-in component strong against blow molded products. Can be held. The parison may be heated at the time of pressing.

According to the third aspect of the present invention, a bridge portion for dividing the built-in component mounting hole of the built-in component is provided in the built-in component mounting hole, and a parison is sucked from the divided built-in component mounting hole to divide the built-in component mounting hole. This is a method of attaching a built-in component of a blow-molded product in which the divided parisons are welded to each other and the bridge portion is held by the parison across the bridge portion.

In the present invention of claim 3, a bridge portion for dividing the built-in component mounting hole of the built-in component is provided with the built-in component mounting hole, and the parison is sucked from the divided built-in component mounting hole to be sucked from the divided built-in component mounting hole. Each of the separated parisons is sucked and welded to each other, and the bridge portion is held by the parison across the bridge portion. Therefore, it is possible to equalize the wall thickness of the outer side of the divided parison and the inner wall of the welded parison. Further, since the bridge portion that divides the built-in component mounting holes is held so as to be wrapped by the parison, it can be reliably and strongly held.

According to the fourth aspect of the present invention, two built-in component mounting holes adjacent to the built-in component are formed, and the parison is sucked through the two adjacent built-in component mounting holes, respectively, and the two adjacent built-in parts are built-in. This is a method for mounting a built-in component of a blow-molded product in which parisons sucked from a component mounting hole are heat-welded to each other and the periphery of the built-in component mounting hole is sandwiched by the parison across two adjacent built-in component mounting holes.

In the present invention of claim 4, two internal component mounting holes adjacent to the internal component are formed, and the parison is sucked through the two adjacent internal component mounting holes, respectively, and the two adjacent internal components are built-in. The parisons sucked from the component mounting holes are welded to each other, and the periphery of the built-in component mounting holes is sandwiched by the parison across two adjacent built-in component mounting holes.

Therefore, the parison can be welded around the built-in component mounting hole, and can be easily deformed along the built-in component mounting hole to reliably sandwich the periphery of the built-in component mounting hole. When the parison sandwiches the periphery of the internal component mounting hole across two adjacent internal component mounting holes, the parisons that have entered through the two internal component mounting holes can be welded to each other, and the internal component can be strongly attached. Can be held. When welding the two parisons, the parisons may be pressed or heated.

According to the fifth aspect of the present invention, after sucking the parison through the built-in component mounting hole by the core mold suction portion of the blow molding core mold, the core mold suction portion provided in parallel with the built-in component mounting hole is used. This is a method of mounting a blow-molded internal component by sucking the side portion of the sucked parison in parallel with the periphery of the built-in component mounting hole and sandwiching the periphery of the built-in component mounting hole of the built-in component with the parison.

In the present invention of claim 5, after the parison is sucked through the built-in component mounting hole by the core mold suction portion of the blow molding core mold, the core mold suction portion provided in parallel with the built-in component mounting hole is used. The side portion of the sucked parison is sucked in parallel with the periphery of the built-in component mounting hole, and the circumference of the built-in component mounting hole of the built-in component is sandwiched by the parison. Therefore, the parison whose side portion is sucked in parallel with the periphery of the built-in component mounting hole can widely sandwich the periphery of the built-in component mounting hole, and the holding strength of the built-in component can be improved.

According to the sixth aspect of the present invention, after sucking the parison from the core mold suction portion of the blow molding core mold via the built-in component mounting hole, the sucked parison is expanded larger than the diameter of the built-in component mounting hole. This is a method for mounting built-in parts of blow-molded products by sandwiching the circumference of the built-in part mounting holes of built-in parts with a parison.

In the present invention of claim 6, after sucking the parison from the core mold suction portion of the blow molding core mold via the built-in component mounting hole, the sucked parison is inflated to be larger than the diameter of the built-in component mounting hole. , Hold the circumference of the built-in part mounting hole of the built-in part with a parison. For this reason, the parison that bulges larger than the diameter of the internal component mounting hole and the parison outside the internal component mounting hole can widely sandwich the circumference of the internal component mounting hole, and the holding strength of the internal component can be improved. it can.

In the present invention of claim 7, after the built-in component attached to the blow-molded core mold is brought into contact with the parison in close contact with the cavity of the blow-molded split mold, and the built-in component is attached to the inside of the blow-molded product. This is a blow molding method for a blow molded product having a built-in component that is blow molded by taking out a blow molding core die from between the blow molding split dies and closing the blow molding split die.

In the present invention of claim 7, after the built-in parts attached to the blow-molded core mold are brought into contact with the parison in close contact with the cavity of the blow-molded split mold, and the built-in parts are attached to the inside of the blow-molded product. , The blow molding core mold was taken out from between the blow molding split dies, and the blow molding split die was closed for blow molding. Therefore, the blow molding split die can be moved in the direction of the blow molding core mold to mount the built-in parts in the parison, and the large built-in parts can be easily mounted in the parison. After being attached to the parison, the blow molded product can be blow molded.

The built-in parts are held in the core mold part holding part of the blow molding core mold so as to face the inner surface of the outer wall of the blow molded product, and the blow molding split mold or the blow molding mold middle mold is moved to move the built-in parts. The built-in parts can be attached to the blow-molded core mold without the need to slide, and the built-in parts can be moved to the parison by moving the blow-molded core mold or blow-molded split mold. It can be attached to, and the structure of the blow molding core mold can be simplified.

The parison is sucked from the core mold suction part of the blow molding die through the internal component mounting hole, and the parison sandwiches the circumference of the internal component mounting hole to attach the internal component to the blow molded product. The built-in parts can be securely attached to the parison only by suction, and strict control of the positions of the parison, the built-in part mounting holes and the core type suction part is not required.

It is sectional drawing of the process of manufacturing a blow molded article with the blow molding die used in embodiment of this invention, and shows the state in which the blow molding die is opened and two parisons are put in the blow molding die. It is sectional drawing which shows. It is sectional drawing of the process of manufacturing a blow molded article with the blow molding die used in embodiment of this invention, and the parison is sucked or pressed into the cavity of the blow molding split die, and the built-in component is attached during blow molding. It is sectional drawing which shows the state which the child die is inserted between the blow molding split molds. It is sectional drawing of the process of manufacturing a blow molded article with the blow molding die used in the embodiment of this invention, and the parison is attached and the blow molding split die is slid close to the blow molding core die. , It is sectional drawing which shows the state which pressed the built-in component attached to the blow molding core mold to a parison. It is sectional drawing of the process of manufacturing a blow molded article with the blow molding die used in the embodiment of this invention, and the built-in part is pressed against the parison while the built-in component attached to the blow molding core die is pressed against a parison. It is sectional drawing which shows the state which parison is attached and the parison is cooled. It is sectional drawing of the process of manufacturing a blow molded article with the blow molding die used in embodiment of this invention, and is sectional drawing which shows the state which the built-in part was attached to a parison, and the blow molding die was opened. It is sectional drawing of the process of manufacturing a blow molded article with the blow molding die used in embodiment of this invention, attached a built-in part to a parison, opened a blow molding die, and from between the blow molding die. It is sectional drawing which shows the state which moved the blow molding core mold. It is sectional drawing of the process of manufacturing a blow molded article with the blow molding die used in embodiment of this invention, the state which closed the blow molding split die, fused two parisons, and was blow molded. It is sectional drawing which shows. It is sectional drawing of the process of manufacturing a blow molded article with the blow molding die used in embodiment of this invention, and is the sectional view which shows the state which opens the blow molding split die and takes out a blow molded article. It is a partially enlarged sectional view of the core mold suction part in the state which the parison has entered into the core mold suction part of the blow molding core mold used in the 1st Embodiment of this invention. It is a partially enlarged sectional view of the core mold suction part in the state where the core mold pressing part of the blow molding core die used in the 1st Embodiment of this invention presses a parison into a built-in component mounting hole. A bridge portion is formed in the built-in component mounting hole of the built-in component used in the second embodiment of the present invention, and the parison enters the core die suction portion of the blow molding core die from the divided built-in component mounting hole. It is a partially enlarged sectional view of the core type suction part in the state which was done. A bridge portion is formed in the built-in component mounting hole of the built-in component used in the third embodiment of the present invention, and the parison enters the core die suction portion of the blow molding core die from the divided built-in component mounting hole. It is a partially enlarged sectional view of the core type suction part in the state which was done. Two built-in component mounting holes adjacent to the built-in component used in the fourth embodiment of the present invention are formed, and a parison is formed from the two built-in component mounting holes to the core die suction portion of the blow molding core die. It is a partially enlarged cross-sectional view of the core type suction part in the state where is entered. Two built-in component mounting holes adjacent to the built-in component used in the fourth embodiment of the present invention are formed, and the two built-in component mounting holes enter the core die suction portion of the blow molding core die. It is a partially enlarged cross-sectional view of the core-type suction portion in a state where the parison is pressed by the core-type pressing portion and welded to each other. It is a partially enlarged sectional view of the core mold suction part in the state which the parison has entered into the core mold suction part of the blow molding core mold used in the 5th Embodiment of this invention. Partial enlargement of the core suction part in the state where the lateral core suction part of the blow molding core mold used in the fifth embodiment of the present invention sucks the parison in the lateral direction of the built-in component mounting hole. It is a sectional view. It is a partially enlarged cross-sectional view of the core mold suction part in the state where the parison entered and expanded into the core mold suction part of the blow molding core mold used in the 6th Embodiment of this invention. It is a perspective view of the fuel tank molded by the embodiment of this invention. FIG. 5 is a perspective view of an apparatus in which a slide core and a drive control pin of a conventional blow molding die manufacture a blow molded product. It is a cross-sectional view of the process of manufacturing a blow-molded product of another conventional blow-molding die, and is the cross-sectional view which shows the state which the blow-molding core mold which attached the built-in component is inserted between two parisons. .. It is a cross-sectional view of the process of manufacturing a blow-molded product of another conventional blow-molding die, in which a blow-molding core die is inserted between two parisons, and the built-in parts of the blow-molding core die are slid. It is sectional drawing which shows the state which presses against a parison. It is sectional drawing of the process of manufacturing the blow molded article of other conventional blow molding dies, and is the enlarged sectional view which shows the state which the fixing pin pressed the parison which entered into the built-in component mounting hole.

Regarding the method of mounting the built-in component 10 of the blow-molded product in which the built-in component 10 is mounted inside the embodiment of the present invention, the blow-molding method for manufacturing the fuel tank 1 for an automobile, which is a blow-molded product, is taken as an example, and FIG. A description will be given with reference to FIG. The present invention will be described by taking a molding method of the fuel tank 1 having the built-in component 10 as an example, but a blow molding method of another blow-molded product having the built-in component 10 can also be used.

FIG. 18 is a perspective view of the fuel tank 1 manufactured by the blow molding method according to the embodiment of the present invention.
In the embodiment of the present invention, as shown in FIG. 18, the fuel tank 1 manufactured by the blow molding apparatus has a pump unit mounting hole 4 for inserting and removing a fuel pump (not shown) or the like into the fuel tank 1. Is formed on the upper surface. Further, a fuel injection hole 5 for injecting fuel from an inlet pipe (not shown) is formed on the side surface or the upper surface of the fuel tank 1.

Further, outer peripheral ribs 2 are formed around the entire circumference of the fuel tank 1, and mounting holes 3 are formed at predetermined locations such as corners of the outer peripheral ribs 2 at several locations. The fuel tank 1 is attached to the vehicle body by bolting the vehicle body to 3.
Further, on the upper surface of the fuel tank 1, mounting holes 6 are formed in various places for connecting a hose or the like for recovering the fuel vapor inside.

The fuel tank 1 molded in the present embodiment is manufactured by a blow molding die described later. The outer wall of the fuel tank 1 is formed by blow molding, and the outer wall is formed of one layer or multiple layers. In the case of multiple layers, for example, the skin layer, the outer main body layer, the outer adhesive layer, the barrier layer, etc. It is formed from an internal adhesive layer and an internal body layer.

Inside the fuel tank 1, for example, a pillar for reinforcing the fuel tank 1, a partition plate for preventing the waviness of fuel and preventing the generation of wavy noise, a fuel pump, and the like. A box-shaped object or the like to which the canister or the like is attached is attached as the built-in component 10.
The built-in component 10 can be formed of a fuel-resistant oil-resistant thermoplastic synthetic resin such as polyacetal or high-density polyethylene (HDPE). As a result, the strength of the fuel tank 1 can be improved, and even if the fuel tank 1 is mounted inside the fuel tank 1, the rigidity does not decrease due to swelling due to fuel oil or the like.

Regarding the blow molding method according to the embodiment of the present invention, the molding method of the fuel tank 1 by blow molding will be described with reference to FIGS. 1 to 17.
The blow molding apparatus used in the embodiment of the present invention includes a die core (not shown) for extruding the parison 8, a parison holding member 50 for holding the parison 8, and a blow molding die for molding the blow molded product. It is composed of 20.

The parison 8 extruded from the die core is cut into two pieces in the vertical direction, and the cut parison 8 is moved to the blow molding die 20 with its tip held by the parison holding member 50.
The parison 8 can be separately extruded into a sheet shape and moved to the blow molding die 20 without being cut into two pieces.

As shown in FIG. 1, the blow molding die 20 has a blow molding split die 21 formed by being divided into two by a parting line, and a fuel tank 1 which is a blow molded product is formed on an opening / closing surface. The cavity 22 of the blow molding split die 21 is formed. Further, as will be described later, a blow molding core mold 30 that moves between the blow molding split dies 21 when the blow molding split dies 21 are opened is provided.
In the present embodiment, the parison 8 is in the form of two cut sheets, but the cylindrical parison 8 is adsorbed on the cavities 22 of the blow-molded split molds 21 on both sides, and the built-in component 10 is used. The blow molding core mold 30 holding the above may be inserted.

As shown in FIG. 2, the blow molding core mold 30 has a core mold component holding portion 31 for mounting the built-in component 10 on both side surfaces facing the blow molding split mold 21. The blow-molded core mold 30 may be provided with a plurality of core mold component holding portions 31 for mounting the built-in component 10 on the respective surfaces on both sides. In this case, a plurality of built-in parts 10 can be mounted at the same time, and even in the case of a large built-in part 10, a plurality of mounting parts are provided in the built-in part 10, and the plurality of mounting parts are each provided as a plurality of core mold parts. It can be easily mounted in the parison 8 by holding it with the holding portion 31. The built-in component 10 can be attached to only one surface of the blow molding core mold 30.

In the first embodiment of the present invention, the shape of the core mold component holding portion 31 is such that the core mold suction portion 32 that sucks the parison 8 at the center and the sucked parison 8 are as shown in FIG. It has a core-type suction recess 33 for holding. Further, it has a core-type pressing portion 34 that presses the parison 8 held in the core-type suction recess 33 by the built-in component mounting hole 11 of the built-in component 10, which will be described later. A hot plate for heating the parison 8 can be provided on the core pressing portion 34.

As shown in FIG. 9, the built-in component 10 is formed with a built-in component mounting hole 11 into which the parison 8 enters on a surface facing the parison 8. Around the built-in component mounting hole 11, there is a built-in component mounting holding portion 12 sandwiched by the parison 8. The built-in component mounting / holding portion 12 comes into contact with the parison 8 and is mounted on the inner surface of the outer wall of the fuel tank 1 after blow molding.

Next, a blow molding method for a blow molded product having the built-in component 10 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 8.
The two parisons 8 extruded from the die core (not shown) move to the blow molding die 20, and as shown in FIG. 1, the blow molding die 20 is divided by a parting line to form a blow. While the molding dies 21 are open to the left and right, they are located facing the cavities 22 of the left and right blow molding dies 21, respectively. The parison 8 is held by sandwiching the upper part and the lower part with the parison holding member 50.

Next, as shown in FIG. 2, air is sucked from the air vent hole provided in the cavity 22 of the blow molding split mold 21, and the parison 8 is sucked into the surface of the cavity 22 at the surface of the cavity 22. Shape the parison 8. It is also possible to insert a compressed air die between the blow molding die 21 and press the parison 8 against the outer peripheral surface of the cavity 22 of the blow molding die 21 by the air of the compressed air die 21.

Then, the blow molding core mold 30 to which the built-in component 10 is attached is inserted between the blow molding split dies 21 . Therefore, it is not necessary to insert the internal component 10 inside the tubular parison 8, and the internal component 10 is placed between the blow molding split molds 21 without the internal component 10 coming into contact with the two parisons 8. Can be done.

Then, the built-in component 10 attached to the blow molding core mold 30 can face the shaped parison 8. When the built-in parts 10 are attached to the parisons 8 formed on the blow-molded split dies 21 on both sides, the built-in parts 10 can be attached to both surfaces of the blow-molded core mold 30. The built-in component 10 is attached to a core mold component holding portion 31 provided in the blow molding core mold 30.

Next, as shown in FIG. 3, the blow molding split dies 21 on both sides are moved in the direction of the blow molding core mold 30 (the direction of the arrow in FIG. 3) to the cavity 22 of the blow molding split die 21. The built-in component 10 attached to the core mold component holding portion 31 of the blow molding split mold 21 is brought into contact with the surface of the close-fitting parison 8. When the built-in component 10 is attached to only one surface of the blow molding core mold 30, the blow molding core mold 30 can be moved.

Then, the built-in component 10 is attached to the parison 8. First, a method of attaching the built-in component 10 to the parison 8 in the first embodiment will be described, and the second to fifth embodiments will be described later.
In the first embodiment, as shown in FIGS. 9 and 10, the core mold component holding portion 31 of the blow molding core mold 30 has the built-in component mounting hole 11 of the internal component 10 in the parison 8. After the contact, the parison 8 is sucked into the core suction recess 33 by the core suction portion 32 via the built-in component mounting hole 11. The sucked parison 8 expands in the core type suction recess 33 to form a bulging portion 8a.

As shown in FIG. 10, after sucking the parison 8 from the core type suction portion 32 via the built-in component mounting hole 11, the sucked parison 8 bulging portion 8a is sucked by the core type pressing portion 34 to be a built-in component. The built-in component mounting holding portion 12 around the built-in component mounting hole 11 of 10 is pressed against the bent portion 8b of the parison 8. The parison 8 is still deformable at high temperatures and can be easily deformed by suction or pressing. Further, a hot plate can be provided on the core pressing portion 34 to heat the parison 8 and make it more easily deformed.

As a result, the parison 8 (which becomes the outer wall of the fuel tank 1) and the parison 8 pressed against the surface opposite to the surface with which the core mold component holding portion 31 of the built-in component mounting and holding portion 12 abuts are pressed. The built-in component 10 is mounted on the fuel tank 1 which is a blow-molded product by sandwiching the built-in component mounting holding portion 12 around the built-in component mounting hole 11.

Therefore, the built-in component 10 can be reliably attached to the parison 8 only by suctioning the parison 8, and strict control of the positions of the parison 8, the built-in component mounting hole 11 and the core type suction portion 32 is not required, and the blow The structure of the molding core mold 30 can be simplified.
Further, after blow molding, the appearance shape of the portion where the parison 8 has entered the built-in component mounting hole 11 can be confirmed from the outside of the fuel tank 1, and the quality of the mounted state of the built-in component 10 can be confirmed.

Next, as shown in FIG. 4, cooling air was blown from the blow molding core mold 30 toward the parison 8 in the direction of the arrow in FIG. 4, and was brought into close contact with the cavity 22, and the built-in component 10 was attached. The parison 8 can be cooled to fix the shape of the parison 8 and the built-in component 10 to the parison 8.
Next, as shown in FIG. 5, the blow molding mold 21 is opened in the direction of the arrow, and the blow molding core mold 30 is moved from between the blow molding molds 21. At this time, the built-in component 10 is attached to the inner surface of the parison 8.

Next, as shown in FIG. 6, the blow molding core mold 30 is taken out from between the blow molding split dies 21. After the blow molding core mold 30 is moved, the flange portion connected as the fuel tank 1 which is the peripheral portion of the parison 8 held in the cavity 22 of the blow molding split die 21 is heated.

Next, as shown in FIG. 7, the blow molding split mold 21 is closed, and the parison 8 held in the cavity 22 of the blow molding split mold 21 is united. Since the periphery of the shaped parison 8 is heated, the periphery of the parison 8 is fused to each other to form a fuel tank 1 which is a blow-molded product having an internal component 10 inside.

Next, as shown in FIG. 8, the blow-molded split mold 21 is opened, and the fuel tank 1 in which the two parisons 8 shaped in the cavity 22 of the blow-molded split mold 21 are united is formed by the parison holding member 50. Hold it and take it out.
The excess portion of the fused portion of the flange portion of the fuel tank 1 is cut off to form the outer peripheral rib 2, and the fuel tank 1 is provided with the built-in component 10.

Next, the second embodiment will be described with reference to FIG.
In the second embodiment, the shapes of the built-in component mounting hole 11 of the built-in component 10 and the core mold component holding portion 31 are different from those of the first embodiment, and the parison 8 has the built-in component mounting hole 11 The difference is that the other parts are the same, so the different parts will be described and the description of the similar parts will be omitted.

In the second embodiment, as shown in FIG. 11, a bridge portion 13 for dividing the built-in component mounting hole 11 is provided in the built-in component mounting hole 11 of the built-in component 10. The parison 8 is sucked into the core suction recess 33 from the divided built-in component mounting hole 11 by the core type suction portion 32, and is sucked from the divided built-in component mounting hole 11 to each other. Is welded to form a welded portion 8c, and the bridge portion 13 is held by the parison 8 so as to wrap around the bridge portion 13. The welded portion 8c of the parison 8 is held by the holding portion 8d.

The shape of the bridge portion 13 is a strip shape, and the divided built-in component mounting holes 11 have a linear division surface and a semicircular shape. Therefore, it is possible to equalize the wall thickness of the holding portion 8d of the divided parison 8 and the linear welded portion 8c welded to each other. Further, since the bridge portion 13 that divides the built-in component mounting hole 11 is held so as to be wrapped by the parison 8, it can be reliably and strongly held. At this time, the parison 8 can be pressed or heated by the core mold component holding portion 31 to improve the welding of the parisons 8 and the holding of the bridge portion 13.

Next, the third embodiment will be described with reference to FIG.
In the third embodiment, the shape of the built-in component mounting hole 11 of the built-in component 10 and the shape of the bridge portion 13 are different from those of the second embodiment, and the other parts are the same. It will be described, and the description of the same part will be omitted.

In the third embodiment, as shown in FIG. 12, the bridge portion 13 has a shape in which the central portion is constricted in an arc shape, and the divided surfaces of the divided built-in component mounting holes 11 face each other in an arc shape. It is semicircular, and the opposite side of the opposite semicircle is straight. Therefore, as in the second embodiment, the wall thickness of the divided holding portion 8d of the parison 8 and the welded linear welding portion 8c of the parisons 8 can be equalized. Further, since the bridge portion 13 that divides the built-in component mounting hole 11 is held so as to be wrapped by the parison 8, it can be reliably and strongly held.
Similar to the second embodiment, the parison 8 can be pressed or heated by the core mold component holding portion 31 to improve the welding between the parisons 8 and the holding of the bridge portion 13.

Next, the fourth embodiment will be described with reference to FIGS. 13 and 14.
In the fourth embodiment, the shapes of the built-in component mounting hole 11 of the built-in component 10 and the core mold component holding portion 31 are different from those of the first embodiment, and the parison 8 has the built-in component mounting hole 11 The difference is that the other parts are the same, so the different parts will be described and the description of the similar parts will be omitted.

In the fourth embodiment, two built-in component mounting holes 11 adjacent to the built-in component 10 are formed, and two core suction portions 32 are formed via the two adjacent built-in component mounting holes 11. The parison 8 is sucked into the core-type suction recess 33, respectively. After that, as shown in FIG. 14, the parison 8 sucked from the two adjacent built-in component mounting holes 11 is heated by the core type pressing portion 34 to which the hot plate is attached so as to cover the two parisons 8. Welding is performed to form a welded portion 8c. If the parison 8 has a high temperature, heating can be omitted.

Further, by pressing the two parisons 8, the two parisons 8 are welded to each other to form a welded portion 8c, and straddle the built-in component mounting holding portion 12 of the two adjacent built-in component mounting holes 11. The parison 8 sandwiches the built-in component mounting holding portion 12 around the adjacent built-in component mounting hole 11 so as to wrap it. The welded portion 8 of the parison 8 is held by the holding portion 8d. The parison 8 that has entered through the two built-in component mounting holes 11 can be combined to hold the built-in component 10. The built-in component 10 can be strongly held by the two built-in component mounting holes 11 and the parison 8.

Further, the melted parison 8 can be welded around the built-in component mounting hole 11, and can be easily deformed along the built-in component mounting hole 11 to securely sandwich the built-in component mounting holding portion 12. it can. It is possible to sandwich the adjacent built-in component mounting holding portion 12 by the parison 8 across the two adjacent built-in component mounting holes 11 and weld the parisons 8 that have entered through the two built-in component mounting holes 11 to each other. The built-in component 10 can be strongly held.

Next, the fifth embodiment will be described with reference to FIGS. 15 and 16.
The fifth embodiment is different from the first embodiment in that the shape of the core mold component holding portion 31 is different and the parison 8 is sucked by the core mold suction portion 32. Since the parts are the same, the different parts will be described, and the description of the similar parts will be omitted.

In the fifth embodiment, as shown in FIG. 15, the core mold suction portion 32 attached to the upper part of the blow molding core mold 30 passes the parison 8 to the core mold via the built-in component mounting hole 11. The bulging portion 8a of the parison 8 is formed by suctioning into the core suction recess 33 of the mold component holding portion 31. After that, as shown in FIG. 16, the core mold suction unit 32, in which the side portion of the suctioned parison 8 is mounted next to the core mold component holding portion 31 in parallel with the built-in component mounting holding portion 12, is a built-in component. The side portion of the parison 8 is sucked in parallel with the built-in component mounting holding portion 12 of the mounting hole 11 to form the bent portion 8b of the parison 8, and the periphery of the built-in component mounting hole 11 of the built-in component 10 is sandwiched by the parison 8. .. Therefore, the parison 8 whose side portion is sucked in parallel with the built-in component mounting holding portion 12 of the built-in component mounting hole 11 can widely sandwich the built-in component mounting holding portion 12, and improves the holding strength of the built-in component 10. be able to.

Next, the sixth embodiment will be described with reference to FIG.
In the sixth embodiment, the shape of the built-in component mounting hole 11 is different from that in the first embodiment, and the other parts are the same. Therefore, the different parts will be described, and the description of the same parts will be omitted. To do.
In the sixth embodiment, the built-in component mounting hole 11 is made smaller than in the other embodiments. That is, the diameter of the built-in component mounting hole 11 is formed to be smaller than the diameter of the core mold suction recess 33 of the core mold component holding portion 31.

After sucking the parison 8 through the built-in component mounting hole 11 by the core mold suction portion 32 of the blow molding core mold 30, the parison 8 sucked in the core mold suction recess 33 is sucked into the built-in component mounting hole 11. A bulging portion 8a that is inflated to a size larger than the diameter is formed, and the built-in component mounting holding portion 12 of the built-in component mounting hole 11 of the built-in component 10 is sandwiched by the inflated parison 8. Therefore, the bulging portion 8a of the parison 8 that bulges larger than the diameter of the built-in component mounting hole 11 can widely sandwich the built-in component mounting holding portion 12, and the holding strength of the built-in component 10 can be improved. ..

1 Fuel tank 8 Parison 10 Built-in parts 11 Built-in parts mounting holes 12 Built-in parts mounting holding part 20 Blow molding mold 30 Blow molding core mold 31 Core mold parts holding part 32 Core mold suction part 33 Core mold suction Recessed 34 core type pressing part

Claims (7)

In the method of attaching the built-in parts of the blow-molded product, the built-in parts are attached to the inside of the outer wall of the blow-molded product formed of synthetic resin by the blow-molding method using a blow-molding mold.
The blow molding die is a blow molding die located between a blow molding die formed by being divided into two by a parting line and a blow molding die when the blow molding die is opened. Has a mold,
An internal component mounting hole for mounting the internal component is formed on the outer wall of the blow molded product in the internal component.
The blow-molded core mold is provided with a core part holding portion for holding the built-in parts and a core mold suction portion for sucking the parison .
The blow molding die is opened at the parting line, the parisons are adsorbed in the cavities of the blow molding split molds on both sides, and the parisons are adsorbed on the blow molding split molds on both sides. Insert the blow molding core mold and
The built-in parts are held in the core part holding portion of the blow-molded core mold so as to face the inner surface of the outer wall of the blow-molded product, and the blow-molded split mold or the blow-molded core metal is held. The mold is moved to bring the built-in component into contact with the parison, and the parison is sucked from the core mold suction portion of the blow molding core mold via the built-in component mounting hole to suck the parison. A method for mounting a built-in component of a blow-molded product, which comprises mounting the built-in component to the blow-molded product by sandwiching the periphery of the built-in component mounting hole. After sucking the parison from the core mold suction portion of the blow molding core mold via the built-in component mounting hole, the sucked parison is pressed to form the built-in component mounting hole of the built-in component. The method for attaching a built-in component of a blow-molded product according to claim 1, wherein the periphery is sandwiched between the parisons. A bridge portion for dividing the built-in component mounting hole of the built-in component is provided in the built-in component mounting hole, the parison is sucked from the divided built-in component mounting hole, and the parison is sucked from the divided built-in component mounting hole. The method for attaching a built-in component of a blow-molded article according to claim 1 or 2, wherein the divided parisons are welded to each other and the bridge portion is held by the parison across the bridge portion. Two internal component mounting holes adjacent to the internal component are formed, and the parison is sucked through the two adjacent internal component mounting holes, respectively, and the two adjacent internal component mounting holes are formed. One of claims 1 to 3, wherein the parisons sucked from the above are welded to each other, and the periphery of the built-in component mounting holes is sandwiched between the two adjacent built-in component mounting holes by the parison. How to attach the built-in parts of the blow molded product described in. The parison was sucked through the built-in component mounting hole by the core mold suction portion of the blow molding core mold, and then sucked by the core mold suction portion provided in parallel with the built-in component mounting hole. According to any one of claims 1 to 4, the side portion of the parison is sucked in parallel with the periphery of the built-in component mounting hole, and the periphery of the built-in component mounting hole of the built-in component is sandwiched by the parison. How to attach the built-in parts of the blow molded product described. After sucking the parison from the core mold suction portion of the blow molding core mold via the built-in component mounting hole, the sucked parison is expanded to be larger than the diameter of the built-in component mounting hole. The method for mounting a built-in component of a blow-molded product according to any one of claims 1 to 5, wherein the periphery of the built-in component mounting hole of the built-in component is sandwiched between the parisons. The built-in parts attached to the blow-molded core mold are brought into contact with the parison that is in close contact with the cavity of the blow-molded split mold, and the built-in parts are attached to the inside of the blow-molded product. A blow-molded product having the built-in component according to any one of claims 1 to 6, wherein the blow-molded core mold is taken out from between the blow-molded molds, and the blow-molded mold is closed and blow-molded. Blow molding method.

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