JP3400327B2 - Manufacturing method of resin tank - Google Patents

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 tank having a through hole in a side wall portion, and more particularly to a method for manufacturing a resin tank to which hollow molding (blow molding) is applied.

[0002]

2. Description of the Related Art As a resin tank manufactured by hollow molding (blow molding), for example, a washer tank which is applied to a wiper device of a vehicle and stores a liquid such as a window washer liquid is known.

In this type of washer tank, as shown in FIG. 25, a through hole 82 for water supply is formed in the side wall of the tank 80. Further, generally, in the vicinity of the through hole 82,
A water supply pump 84 is attached to the tank 80 itself. The inlet 84 of the pump 84 is the grommet 8
It is fitted into the through hole 82 via 8 and thereby the sealing property around the through hole 82 is secured. When the pump 84 operates, the washer liquid in the tank 80 is absorbed by the pump 84 and discharged from the outlet 90.

By the way, as described above, the through hole 8 of the tank 80.
A grommet 88 is interposed between the pump 2 and the inlet 86 of the pump 84 to ensure the sealing performance of the through hole 82. In order to secure such sealing performance, Is the inner peripheral wall of the through hole 82 (that is,
A high surface roughness is required for the contact surface with the grommet 88). In other words, if the surface roughness of the inner peripheral wall of the through hole 82 is poor,
Adhesion with the grommet 88 deteriorates, resulting in poor sealing.

Therefore, conventionally, the through hole 82 is formed and the sealing surface (inside the through hole) is formed by forming the main body (hollow body) of the tank 80 by hollow forming and then processing it with a tool such as a drill. The surface roughness of the peripheral wall) is secured. Therefore, there are many manufacturing steps, and it takes time to manufacture, which is a cause of high cost.

In this case, a manufacturing technique has been proposed in which a through hole 82 can be formed when the tank 80 is formed by hollow forming without the need for post-processing using a tool such as a drill (Japanese Patent Publication No. Hei 3). -76808).

According to the manufacturing technique disclosed in the above publication, a tool with a blade forming a cavity is provided so as to enter the outside of a mold surface (cavity) of a molding die, and a parison is expanded to form a hollow body. After the formation, the side wall portion of the hollow body is cut (opened) by the tool with a blade to form the through hole 82. According to this manufacturing technique, after the tank 80 (hollow body) is molded by hollow molding, post-processing using a tool such as a drill is not required,
The tank 80 can be formed in a single manufacturing process.

However, in the manufacturing technique disclosed in the above publication, since the through hole 82 is formed by cutting the side wall portion of the hollow body with a bladed tool, the inner peripheral wall of the through hole 82 is formed. The part (sealing surface) is a cut surface. Therefore, there is a disadvantage that the inner peripheral wall portion (sealing surface) has a poor surface roughness (a required surface roughness cannot be secured), and as a result, a poor sealing is likely to occur. Therefore, the tank 80 manufactured by the manufacturing technique disclosed in the above publication cannot be applied to a washer tank of a vehicle.

[0009]

In consideration of the above facts, the present invention can form the sealing surface of the through hole with a high surface roughness, and at a low cost without requiring complicated processing. The object is to obtain a method of manufacturing a resin tank that can be realized.

[0010]

A method of manufacturing a resin tank according to a first aspect of the present invention is a method of manufacturing a resin tank having a through hole in a side wall portion, the cylindrical shape corresponding to the through hole. The protruding portion configured in the above is protruded inward from the die surface of the forming die to be provided in the forming die in advance, and the tool with a blade having a columnar shape and a blade tip at the tip is Placed in a portion, expand the resin parison in the mold, press the resin parison to the mold and contact the resin parison to the peripheral wall of the convex portion, the peripheral wall of the convex portion A hollow body is formed in a state where the inner peripheral wall surface of the through hole is molded, and then the bladed tool is advanced toward the inside of the hollow body, and the resin of the hollow body corresponding to the blade edge of the bladed tool. Cut the parison to form the through hole and , The bladed tool with disengaging from said hollow body, open the mold is taken out a hollow body in which the through hole is formed, it is characterized in that.

In the method for manufacturing a resin tank according to the first aspect of the present invention, the cylindrical convex portion corresponding to the through hole of the tank is projected in advance so as to enter the inside of the molding surface of the molding die in advance. It is provided in the mold. Further, the bladed tool is arranged in the cylindrical convex portion.

By expanding the resin parison in this molding die, the parison is pressed by the molding die and brought into close contact with the peripheral wall of the convex portion. As a result, the inner peripheral wall surface of the through hole is formed by the peripheral wall of the convex portion to form the hollow body.

Next, when the bladed tool arranged in the convex portion is advanced toward the inside of the hollow body, the resin parison of the hollow body corresponding to the blade tip of the bladed tool is cut off to form a through hole. Furthermore, the resin tank is manufactured by removing the tool with a blade from the hollow body, opening the molding die, and taking out the hollow body in which the through holes are formed.

According to the method of manufacturing a resin tank according to the first aspect, the resin parison is expanded in the molding die and the resin parison is brought into close contact with the peripheral wall of the convex portion to form the through hole. It That is, since the inner peripheral wall surface of the through hole is formed not along the cut surface but along the peripheral wall of the cylindrical convex portion (since the peripheral wall of the convex portion becomes the inner peripheral wall surface of the through hole as it is), The roughness of the inner peripheral wall portion (sealing surface) can be increased (a required surface roughness can be secured). Therefore, the sealing property of the through hole can be ensured, and it can be suitably used, for example, in a washer tank of a vehicle.

Further, the through hole can be formed at the same time when the hollow body is formed by hollow molding, instead of the conventional structure in which the through hole is formed by post-processing using a tool such as a drill. The resin tank provided can be formed in a single manufacturing process, and the cost can be reduced.

As described above, in the method of manufacturing the resin tank according to the first aspect, the sealing surface of the through hole can be formed to have a high surface roughness, and the sealing surface of the through hole can be made low without complicated processing. It can be realized at cost.

A method for manufacturing a resin tank according to a second aspect of the present invention is the method for manufacturing a resin tank according to the first aspect, wherein a heater is provided at a blade tip portion of the bladed tool, and the blade tip is formed by the bladed tool. When the resin parison of the hollow body corresponding to the above is cut, the resin parison is cut while being melted by the heater.

In the method for manufacturing a resin tank according to the second aspect of the present invention, when the resin parison of the hollow body corresponding to the blade tip is cut off by the bladed tool, the resin parison is heated and melted by the heater provided at the blade tip portion. While being excised.

Therefore, when the bladed tool is advanced toward the inside of the hollow body to cut the resin parison of the hollow body to form the through hole, it is not necessary to apply a large pressing force to the cut portion of the resin parison. . Therefore, the hollow body (general portion of the resin parison) is not unnecessarily displaced or moved with the movement of the bladed tool, and the resin parison corresponding to the through hole can be reliably cut off. Therefore, the product accuracy is further improved. Therefore, the through hole can be easily formed even in a place where the holding force of the hollow body (the general part of the resin parison) by the molding die is low (in other words, regardless of the position where the through hole is formed). , The molding die can be set), and the degree of freedom in design and the range of application are expanded.

A method for manufacturing a resin tank according to a third aspect of the present invention is the method for manufacturing a resin tank according to the first aspect, in which the resin parison of the hollow body corresponding to the cutting edge is cut off by the blade tool. In this case, the cutting piece is held by the bladed tool, and when the bladed tool is detached from the hollow body, the cutting piece is removed from the hollow body together with the bladed tool. .

In the method of manufacturing a resin tank according to the third aspect, when the resin parison of the hollow body corresponding to the blade tip is cut by the bladed tool, the cut piece is held by the bladed tool, and further, the bladed tool is attached. When the tool is removed from the hollow body, the cutting piece is removed from the hollow body together with the bladed tool.

Therefore, the cut pieces of the resin parison do not drop into the hollow body and remain there. Therefore, the step of re-taking out the cut pieces remaining after the mold is opened and the hollow body is taken out becomes unnecessary. The man-hours can be reduced and the cost can be reduced.

A method of manufacturing a resin tank according to a fourth aspect of the present invention is the method of manufacturing a resin tank according to any one of the first, second and third aspects, wherein the convex portion is formed by a pair of male and female split molding. It is characterized in that the through hole is formed by being provided in the vicinity of the mold matching portion of the mold.

In the method for manufacturing a resin tank according to the fourth aspect of the present invention, the convex portion (that is, the tool with the blade) is provided in the vicinity of the mating portion of the male and female split molds to form the through hole. It

Here, the resin parison (a portion other than the portion formed in the resin tank as a product) is photographed and held in the mold matching portion of the split mold. Therefore, when the blade tool disposed in the convex portion is advanced toward the inside of the hollow body to cut the resin parison of the hollow body to form the through hole, the hollow body (resin The general part of the parison) does not move or move unnecessarily,
The resin parison corresponding to the through hole can be reliably cut off. Therefore, the product accuracy is further improved.

A method of manufacturing a resin tank according to a fifth aspect of the present invention is the method of manufacturing a resin tank according to any one of the first to fourth aspects, wherein an undercut portion is formed in the hollow body. It is characterized in that the through hole is formed by forming the cavity of the forming die and providing the convex portion at a position near the forming die corresponding to the undercut portion.

In the method for manufacturing a resin tank according to the fifth aspect, the cavity of the molding die is configured to mold the undercut portion in the hollow body, and the vicinity of the molding die corresponding to the undercut portion of the hollow body. A tubular portion (that is, a tool with a blade) is provided at the position to form a through hole.

Here, the undercut portion of the hollow body is, of course, difficult to separate from the molding die. In other words, the hollow body is securely held in the molding die. Therefore, when the blade tool disposed in the convex portion is advanced toward the inside of the hollow body to cut the resin parison of the hollow body to form the through hole, the hollow body (resin The general part of the parison) does not unnecessarily shift or move, and the resin parison corresponding to the through hole can be reliably cut off. For this reason,
Product accuracy is further improved.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 5 shows a structure of a main part of a washer tank 10 as a resin tank manufactured by applying the method for manufacturing a resin tank according to the first embodiment of the present invention. Shown in front view. 6 is a bottom view showing the structure of the main part of the washer tank 10.

The washer tank 10 is applied to, for example, a vehicle wiper device, and can store a liquid such as a window washer liquid.

A through hole 12 for water supply is formed in the side wall portion of the washer tank 10. Further, a pair of pump fitting portions 14 facing each other are formed on the side wall portion near the through hole 12. As will be described in detail later, the pump fitting portion 14 serves as an undercut portion when the washer tank 10 is manufactured by blow molding. A water supply pump 16 is fitted and attached to the pump fitting portion 14. The inlet 16 of the pump 16 is fitted into the through hole 12 via the grommet 20, so that the sealing performance around the through hole 12 is secured. When the pump 16 operates, the washer tank 10
The washer liquid inside is absorbed by the pump 16 and is discharged from the outlet 22.

Here, FIG. 1 is a sectional view showing main steps of the method for manufacturing a resin tank according to the first embodiment of the present invention.

This manufacturing method is basically hollow molding (blow molding), the above-mentioned washer tank 10 can be manufactured, and a pair of male and female split molds 30 and 32 are used. A cavity 34 corresponding to the washer tank 10 (product) is formed by the pair of split molds 30 and 32.

A convex portion 35 and a tool hole 36 are formed on one of the molding dies 30. The convex portion 35 is formed in a cylindrical shape corresponding to the through hole 12 of the washer tank 10 described above, and is provided so as to protrude inward from the general mold surface of the molding die 30. A tool hole 36 is formed inside the protrusion 35 (so as to be continuous with the inner space of the protrusion 35).

Further, the molding die 30 near the tool hole 36 is provided with a cavity 34 for molding the pump fitting portion 14 (undercut portion).

Furthermore, a tool 38 with a blade is provided in the tool hole 36.
Are arranged. The bladed tool 38 is formed in a columnar shape, and as shown in detail in FIGS. 2 and 3, a blade tip portion 40 is formed at the tip. Therefore, the bladed tool 38
The blade edge portion 40 corresponds to the through hole 12 of the washer tank 10 described above.

Further, a cylinder 44 is fixed to the molding die 30 via a fixed base 42. Cylinder 44
The rod 46 is connected to the rear side of the bladed tool 38, and the rod 46 is expanded and contracted by the operation of the cylinder 44 to move the bladed tool 38 in the tool hole 36.

Here, when the washer tank is formed, the bladed tool 38 is used to form the tip surface of the convex portion 35 (the cavity 3).
4) protruding into the inside (or
It is provided in advance (to be flush).

Next, FIG. 4 is a flow chart showing the specific steps of the method for manufacturing the resin tank according to the first embodiment, and the specific steps of the present manufacturing method are shown in accordance therewith. explain.

As described above, when the washer tank 10 is molded, the molding die 30 provided with the convex portion 35 and the molding die 32 are set, and the bladed tool 38 is inserted further into the inside than the tip surface of the convex portion 35. It is provided in advance by projecting to

After setting the split molds 30, 32 and the bladed tool 38 in this way, first, in step 100, a resin parison is injected. Further, in step 102, the injected resin parison hangs down and is stretched by its own weight. The temperature of the resin parison in this step is 185 degrees, for example.

Next, in step 104, the resin parison is clamped by the split molds 30 and 32, and further,
In step 106, compressed air is blown into the resin parison (air blow) while maintaining the mold clamping pressure by the split molds 30 and 32. The air blowing time is, for example, 35 seconds.

As a result, the resin parison is expanded in the cavities 34 of the split molds 30, 32, and the resin parison is pressed against the mold surfaces (cavities 34) of the split molds 30, 32 as shown in FIGS. At the same time, it is brought into close contact with the peripheral wall of the convex portion 35.

As a result, the hollow body T is formed in a state where the inner peripheral wall surface of the through hole 12 is formed by the peripheral wall of the convex portion 35.

Next, in step 108, the cylinder 44 is operated to advance the bladed tool 38 toward the inside of the hollow body T (divided forming dies 30, 32). As a result, as shown in FIG. 3, the resin parison of the hollow body T corresponding to the blade tip portion 40 of the bladed tool 38 is cut off to form the through hole 12. At this point, hollow body T (resin parison)
The temperature is, for example, 120 degrees.

After the resin parison of the hollow body T is cut off and the through hole 12 is formed, in step 110, the bladed tool 38 is held in its moving state (for example, 1).
0 seconds). In this state, the hollow body T and the cut piece S are cooled to about 90 degrees.

Further, in step 112, the cylinder 44 is actuated again to move the bladed tool 38 backward in the opposite direction to the above-mentioned direction to separate it from the hollow body T (divided forming dies 30, 32). At this time, the cut piece S may fall inside the hollow body T, but since the cut piece S has already been cooled in step 110, the cut piece S will not be welded inside the hollow body T.

Thereafter, in step 114, the air in the split molds 30 and 32 is evacuated and exhausted, and then in step 11
At 6, the split molds 30 and 32 are opened. Further, in step 118, the resin-made washer tank 10 is manufactured by taking out the hollow body T in which the through hole 12 is formed. The washer tank 10 at this point
The temperature of is, for example, 88 degrees. Further, when the cut piece S falls inside the hollow body T, a step of taking out the cut piece S remaining inside the hollow body T is performed after the step 118.

Here, according to the method of manufacturing the resin tank according to the first embodiment, the resin parison is expanded in the split molds 30 and 32 so that the resin parison adheres to the peripheral wall of the convex portion 35. By doing so, the through hole 1 of the washer tank 10
2 is formed. That is, since the inner peripheral wall surface of the through hole 12 is formed not along the cut surface but along the peripheral wall of the convex portion 35 (since the peripheral wall of the convex portion 35 becomes the inner peripheral wall surface of the through hole 12 as it is). The roughness of this inner peripheral wall portion (sealing surface) can be increased (a required surface roughness can be secured). Therefore, the sealability of the through hole 12 can be secured, and it is optimal as a washer tank for a vehicle.

Further, the through hole 12 is formed at the same time when the hollow body T is formed by blow molding, instead of the conventional structure in which the through hole 12 is formed by post-processing using a tool such as a drill.
Can be formed, and the washer tank 10 provided with the through holes 12 can be formed in a single manufacturing process, and the cost can be reduced.

Further, in the method of manufacturing the resin tank according to the first embodiment, as shown in FIG. 7, the mold surface (cavity 34) of the molding die 30 is formed in the hollow body T on the pump fitting portion 1.
4 (undercut part) is formed,
Mold 30 corresponding to the pump fitting portion 14 of the hollow body T
The convex portion 35 (the bladed tool 38) is provided in the vicinity of the above position to form the through hole 12.

Here, as shown in FIG. 8, the pump fitting portion 14 (undercut portion) of the hollow body T is naturally the molding die 3.
It is difficult to separate from 0, in other words, the hollow body T is securely held by the molding die 30. Therefore, the above-mentioned step 1
In 08, when the bladed tool 38 is advanced toward the inside of the hollow body T to cut the resin parison of the hollow body T to form the through holes 12, the hollow body T (resin The general part of the parison) does not unnecessarily shift or move, and the resin parison corresponding to the through hole 12 can be reliably cut off. Therefore, the product accuracy of the washer tank 10 is further improved.

As described above, in the method of manufacturing the resin tank according to the first embodiment, the sealing surface of the through hole 12 of the washer tank 10 can be formed with high surface roughness,
In addition, this can be realized at low cost without requiring complicated processing.

Next, another embodiment of the present invention will be described. It should be noted that parts and manufacturing processes that are basically the same as those in the first embodiment are given the same reference numerals as those in the first embodiment, and description thereof will be omitted.

FIG. 9 is a sectional view showing main steps of the method for manufacturing a resin tank according to the second embodiment of the present invention.

In the method for manufacturing a resin tank according to the second embodiment, a bladed tool 39 is used instead of the bladed tool 38 in the first embodiment described above. A conical blade tip portion 41 is formed on the bladed tool 39, and when the washer tank 10 is molded, the blade tip portion 41 is positioned in the inner space (tool hole 36) in the convex portion 35. It is provided in advance.

Also in the method of manufacturing the resin tank according to the second embodiment, the washer tank 10 is molded by the same steps as those shown in FIG. That is, the through hole 12 of the washer tank 10 is formed by expanding the resin parison in the split molds 30 and 32 and bringing the resin parison into close contact with the peripheral wall of the convex portion 35. Also in this case, the inner peripheral wall surface of the through hole 12 is not the cut surface but the convex portion 35.
Since it is formed following the peripheral wall of (the peripheral wall of the convex portion 35 becomes the inner peripheral wall surface of the through hole 12 as it is), the roughness of this inner peripheral wall portion (sealing surface) can be increased ( It is possible to secure the required surface roughness). Therefore, the sealing property of the through hole 12 can be ensured.

As described above, since the inner peripheral wall portion (sealing surface) of the through hole 12 of the washer tank 10 is formed following the peripheral wall of the convex portion 35, the blade tip portion 41 of the bladed tool 39 is formed in a conical shape. Even then, the sealing property of the through hole 12 can be ensured, and the degree of freedom in which the blade tip portion 41 of the bladed tool 39 determines the shape and structure is improved.

Next, FIGS. 10 and 11 are sectional views showing main steps of the method for manufacturing a resin tank according to the third embodiment of the present invention.

In the method of manufacturing a resin tank according to the third embodiment, a bladed tool 43 is used instead of the bladed tool 38 in the first embodiment described above. A heater is provided at the blade tip portion 45 of the bladed tool 43.

In the method of manufacturing the resin tank according to the third embodiment, the washer tank 10 is basically formed by the same process as shown in FIG.
8, the cylinder 44 is operated to operate the bladed tool 43.
When advancing the inside of the hollow body T (divided forming dies 30, 32), the heater provided in the blade tip portion 45 is activated, and the resin parison of the hollow body T corresponding to the blade tip portion 45 is heated and melted. While being cut off, the through holes 12 are formed (the state shown in FIG. 11).

Therefore, when the bladed tool 43 is advanced toward the inside of the hollow body T to cut the resin parison of the hollow body T to form the through holes 12, a large pressing force is applied to the cut portion of the resin parison. No need to add. Therefore, the bladed tool 4
Hollow body T along with the movement of 3 (general part of resin parison)
However, the resin parison corresponding to the through hole 12 can be reliably cut off without being displaced or moved unnecessarily. Therefore, the product accuracy is further improved. Therefore, the through hole 12 can be easily formed even in a place where the holding force of the hollow body T (a general part of the resin parison) by the split molds 30 and 32 is low (in other words, the through hole 12). The split molds 30 and 32 can be set regardless of the formation position of 12), and the degree of freedom in design and the range of application are expanded.

Next, FIGS. 12 and 13 are sectional views showing the main steps of the method of manufacturing a resin tank according to the fourth embodiment of the present invention.

In the method for manufacturing a resin tank according to the fourth embodiment, a bladed tool 48 is used instead of the bladed tool 38 in the first embodiment described above. The bladed tool 48 has a blade tip portion 50 formed at its tip and a holding pin 52 protruding therefrom. The holding pin 52 has a function of holding the cut piece S as it is when the tool 48 with a blade is advanced to cut off the resin parison of the hollow body T corresponding to the cutting edge portion 50.

In the resin tank manufacturing method according to the fourth embodiment, the washer tank 10 is basically formed by the same steps as those shown in FIG.
6, when the resin parison is pressed against the mold surfaces of the split molding dies 30 and 32 and is brought into close contact with the peripheral wall of the bladed tool 48, the resin parison is also adhered to the periphery of the holding pin 52 (FIG. 12). (State shown). Further, in step 108, the cylinder 44 is operated to advance the bladed tool 48 toward the inside of the hollow body T (divided forming dies 30, 32), and as shown in FIG. The resin parison of the hollow body T corresponding to
Is formed.

Further, in step 110, the bladed tool 4
When 8 is held in its moving state, the cut piece S is positively held by the holding pin 52. Therefore, after that, the tool 48 with a blade is attached to the hollow body T (divided forming dies 30, 3
Even if it is detached from 2), the cut piece S is removed from the hollow body T together with the bladed tool 48.

Therefore, the cut piece S of the resin parison does not drop and remain inside the hollow body T. Therefore, the cut piece remaining after the split molds 30 and 32 are opened and the hollow body T is taken out. The step of taking out S again is unnecessary, and the number of steps can be reduced and the cost can be reduced.

In the fourth embodiment,
The holding pin 52 is provided so as to project from the tip of the bladed tool 48, but the shape of the holding pin 52 is not limited to this, and any configuration that can hold the cut piece S may be used.

For example, a holding groove 60 may be formed at the tip as in the bladed tool 58 shown in FIG.
According to the bladed tool 58, when the resin parison is pressed against the mold surfaces of the split molding dies 30 and 32 and is brought into close contact with the peripheral wall of the bladed tool 58, the resin parison is also held in the holding groove 60. Infiltrate. Therefore, the tool 58 with a blade is attached to the hollow body T.
After the resin parison of the hollow body T is cut by advancing inward of the (divided molding dies 30, 32), the cut piece S is held by the holding groove 60. Therefore, even if the bladed tool 58 is subsequently removed from the hollow body T (divided forming dies 30, 32), the cut piece S is removed from the hollow body T together with the bladed tool 58 and falls into the hollow body T. Does not remain, and the step of retrieving the cut-out piece S is unnecessary, and the number of steps can be reduced and the cost is reduced.

Further, for example, like the tool 64 with a blade shown in FIG. 15, a wedge-shaped holding convex portion 66 may be formed at the tip. According to this bladed tool 64, the holding convex portion 66
Is formed in the shape of an inverted wedge with a tapered tip, the holding force of the cut piece S is significantly improved. Therefore, the cut piece S can be more surely removed from the hollow body T together with the bladed tool 64, which is more effective. Furthermore, as in the tool 70 with a blade shown in FIG. 16, a wedge-shaped holding recess 72 may be formed at the tip. Even in this case, similarly, the holding force of the cut piece S is remarkably improved, which is more effective.

Next, FIGS. 17 and 18 are sectional views showing main steps of the method for manufacturing a resin tank according to the fifth embodiment of the present invention.

In the method for manufacturing a resin tank according to the fifth embodiment, a bladed tool 100 is used instead of the bladed tool 38 in the first embodiment described above. The bladed tool 100 has a blade tip portion 102 formed at the tip. The cutting edge portion 102 is formed so as to be conically inclined from the upper side to the lower side (in a shape in which only the upper portion is pointed),
When cutting the resin parison of the hollow body T corresponding to the cutting edge portion 102 by advancing the bladed tool 100, only the upper part of the resin parison is cut, and the uncut parison piece P remains at the lower part. ing.

In the method of manufacturing the resin tank according to the fifth embodiment, the washer tank 10 is basically formed by the same steps as those shown in FIG.
8, the cylinder 44 is operated to operate the bladed tool 10
When 0 is advanced toward the inside of the hollow body T (divided forming dies 30, 32), only the upper part of the resin parison of the hollow body T corresponding to the cutting edge portion 102 of the bladed tool 100 is cut as shown in FIG. The lower part of the resin parison is not cut but is bent as it is toward the bottom of the hollow body T as the tool 100 with a blade advances. In this state, in step 110, the bladed tool 100 is held in its moving state and the hollow body T and the parison piece P are cooled and solidified to form the through holes 12.

As described above, also in the method of manufacturing the resin tank according to the fifth embodiment, it is possible to secure the sealing surface necessary for the grommet 20 to be in close contact.

Further, in the method of manufacturing the resin tank according to the fifth embodiment, the parison piece P after the through hole 12 is formed is retained as it is and falls into the hollow body T and remains there. Therefore, there is no need for a step of reopening the parison piece P remaining after opening the split molds 30 and 32 and taking out the hollow body T, and the number of steps can be reduced and the cost can be reduced.

Further, in the resin tank manufacturing method according to the fifth embodiment, the manufactured washer tank 10 is used.
When actually using, by the parison piece P,
There is also a unique effect that foreign matter such as dust remaining on the bottom of the washer tank 10 can be prevented from entering the through hole 12 (in other words, the parison piece P serves as a foreign matter intrusion prevention wall). . Therefore, it is possible to prevent damage to the pump 16 or the like due to, for example, intrusion of foreign matter, which is even more effective.

In the fifth embodiment,
By forming the blade edge portion 102 of the bladed tool 100 from the upper side to the lower side in a conical shape (in a shape in which only the upper portion is sharp), only the upper portion of the resin parison is cut and the parison piece P that is not cut into the lower portion is formed. Although it is configured to remain, the shape (configuration) of the bladed tool 100 for cutting so that the parison piece P that is not cut when forming the through holes 12 remains is not limited to this.

For example, as shown in FIGS. 19 and 20, a bladed tool 10 including an upper blade portion 104A and a lower main body portion 104B.
It may be 4. In this bladed tool 104, the upper blade 1
Only 04A is configured to advance toward the inside of the hollow body T (divided molding dies 30, 32).

According to this bladed tool 104, the upper blade portion 10
By advancing only 4A, the lower part of the resin parison of the hollow body T corresponding to the bladed tool 104 is not cut, but only the upper part of the resin parison is cut. Thereby, the through hole 12 and the parison piece P are formed in the same manner as described above.

Even in this case, it is possible to secure the sealing surface necessary for closely attaching the grommet 20.

Next, FIG. 21 is a sectional view showing main steps of the method for manufacturing a resin tank according to the sixth embodiment of the present invention.

In the method of manufacturing a resin tank according to the sixth embodiment, a bladed tool 110 is used instead of the bladed tool 38 in the first embodiment described above. The bladed tool 110 includes a main body 110A and the main body 1
A plurality of needle portions 110B held by 10A so as to be relatively movable
It is composed by. In this bladed tool 110, only the plurality of needle portions 110B are hollow bodies T (split molds 30, 3).
It is configured to move inward in 2).

In the method of manufacturing the resin tank according to the sixth embodiment, the washer tank 10 is basically formed by the same process as shown in FIG.
8, the cylinder 44 is operated to operate the bladed tool 11
When 0 is advanced toward the inside of the hollow body T (divided molds 30, 32), only the resin parison of the hollow body T corresponding to the needle portion 110B of the bladed tool 110 is cut. Therefore, after the hollow body T is cooled and solidified after the operation of the bladed tool 110, a plurality of mesh-like holes are formed in the parison piece P. As a result, the washer tank 10 is integrally formed with the mesh-shaped filter portion 112 in the through hole 12 as shown in FIGS. 22 (A) and 22 (B), and is completed as a product.

As described above, in the method of manufacturing the resin tank according to the sixth embodiment, not only can the sealing surface necessary for the grommet 20 to be in close contact be ensured, but the through hole 12 can be meshed. Shaped filter section 112
The washer tank 1 is manufactured because the
This washer tank 10 is used when 0 is actually used.
There is a peculiar effect that foreign matter such as dust remaining on the bottom of the inside can be prevented from entering the through hole 12. Therefore, for example, the pump 16 caused by foreign matter intrusion
Can be prevented in advance, and it is not necessary to provide another new filter at the end of the grommet 88.

In the sixth embodiment,
The number of needles 110B of the bladed tool 110 and the size thereof (that is, the roughness of the mesh of the filter 112) can be set arbitrarily and may be determined according to the foreign matter to be the target.

Next, FIG. 23 is a sectional view showing main steps of the method for manufacturing a resin tank according to the seventh embodiment of the present invention.

In the method of manufacturing the resin tank according to the seventh embodiment, the auxiliary mold 114 is attached to the split mold 30.
Is installed. A screw part 116 is provided on the outer periphery of the auxiliary mold 114, and the screw part 116 is used for forming the mold 3.
By screwing into 0, the tip end portion protrudes into the inside of the general mold surface of the molding die 30 and the molding die 3
It is integrated with 0. The tip protrusion of the auxiliary mold 114 corresponds to the above-described convex portion 35. Further, the auxiliary mold 114 changes the screwing state of the screw portion 116 and moves the screw portion 116 in the axial direction, so that the tip protruding portion (the convex portion 3)
This is a configuration in which the protrusion amount of 5) can be changed. In addition, inside the auxiliary mold 114, the tool hole 36 is formed and the bladed tool 38 and the like are arranged, as in each of the above-described embodiments.

Also in the method for manufacturing a resin tank according to the seventh embodiment, the washer tank 10 is molded by the same steps as those shown in FIG. That is, the resin parison is expanded in the split molds 30 and 32, and the auxiliary mold 11
The resin parison is brought into close contact with the peripheral wall of the protruding portion (convex portion 35) of the tip 4 of FIG. Also in this case, the inner peripheral wall surface of the through hole 12 is formed not along the cut surface but along the peripheral wall of the tip protruding portion of the auxiliary mold 114 (the peripheral wall of the tip protruding portion of the auxiliary mold 114 is transparent as it is). Since it becomes the inner peripheral wall surface of the hole 12), the roughness of the inner peripheral wall portion (sealing surface) can be increased (the required surface roughness can be secured). Therefore, the sealing property of the through hole 12 can be ensured.

Furthermore, in the method of manufacturing a resin tank according to the seventh embodiment, the auxiliary mold 114 forming the convex portion 35 is provided on the molding die 30 by the screw portion 116, and the screw portion 116. By changing the screwed state of the tip and moving it in the axial direction, the tip projection (projection 35) is formed.
Since the amount of protrusion can be changed, the size of the inner peripheral wall portion (sealing surface) of the through hole 12 can be arbitrarily set. Therefore, it is possible to form the through hole 12 having a size according to the mating component attached to the through hole 12, and the range of application is greatly expanded.

Next, FIG. 24 is a sectional view showing main steps of the method for manufacturing a resin tank according to the eighth embodiment of the present invention.

In the method of manufacturing a resin tank according to the eighth embodiment, in the split molding die 30, the peripheral portion including the above-mentioned convex portion 35 is the nesting die 120A and the nesting die 1.
20B ... has a configuration set as a nesting type 120N. That is, the nesting molds 12 corresponding to those having different diameters of the protrusions 35 (through holes 12) and protrusions of the protrusions 35 (dimensions of the sealing surface of the inner peripheral wall of the through holes 12) are provided.
0A, nesting type 120B ... Nesting type 120N are set in plural types, and are configured to be appropriately replaced (exchanged) and used.

Also in the method of manufacturing a resin tank according to the eighth embodiment, the washer tank 10 is molded by the same steps as those shown in FIG. That is, the through hole 12 of the washer tank 10 is formed by expanding the resin parison in the split molds 30 and 32 and bringing the resin parison into close contact with the peripheral wall of the convex portion 35.

In this case, in the method of manufacturing the resin tank according to the eighth embodiment, the diameter dimension of the convex portion 35 (the through hole 12) and the protruding dimension of the convex portion 35 (the inner peripheral wall portion of the through hole 12 are A plurality of types of nesting dies 120A, nesting dies 120B, etc. are set corresponding to those having different sealing surface dimensions, etc., so these nesting dies 120A, nesting dies 120B, etc. can be appropriately replaced (replacement). If used, the through hole 12 having an optimum size can be formed, and the range of application is greatly expanded.

The cross-sectional shape and size of the cutting edge portion 40 of the tool 38 with a blade in each of the above-described embodiments can be arbitrarily changed, and if this is changed as desired, The through hole 12 can be formed not only in a circular shape but also in any shape and size such as a square shape or an elliptical shape.

In each of the above-mentioned embodiments,
A configuration in which the convex portion 35 (tool hole 36) is provided in the vicinity of the molding die 30 corresponding to the pump fitting portion 14 of the washer tank 10 (hollow body T) (in other words, the pump fitting portion 14).
Although the configuration is such that the through hole 12 is molded in the vicinity of the (undercut portion), the molding position of the through hole 12 (that is, the formation position of the convex portion 35) is not limited to this. For example,
The convex portion 35 (tool hole 36) is provided with a pair of split molding dies 30, 3
The through hole 12 may be formed at a position A (see FIG. 1) near the mold matching portion (parting line) 33 other than the second cavity 34 (mold surface for molding the hollow body T).

In this case, in the mold matching portion (parting line) 33 other than the cavity 34 (mold surface for molding the hollow body T) of the split molding dies 30, 32, a resin parison (formed as a product in the washer tank 10) is formed. (Parts other than that) are captured and retained. Therefore, when the bladed tool 38 or the like is advanced toward the inside of the hollow body T to cut the resin parison of the hollow body T to form the through holes 12, the hollow body T is moved along with the movement of the bladed tool 38 or the like. (General part of resin parison) does not move or move unnecessarily,
The resin parison corresponding to 2 can be reliably cut off. Therefore, the product accuracy of the washer tank 10 is further improved. Furthermore, in each of the above-described embodiments, the bladed tool 38 and the like are moved by the cylinder 44, but the configuration for moving the bladed tool 38 and the like is not limited to this. For example, a cam mechanism, a motor, or an electromagnet may be used to move the bladed tool 38 and the like.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the main steps of a method of manufacturing a resin tank according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a main step of the method of manufacturing a resin tank according to the first embodiment of the present invention, in a state where a resin cavity is pressed against and closely adhered to a mold surface.

FIG. 3 is a cross-sectional view showing a main step of the method for manufacturing a resin tank according to the first embodiment of the present invention, in a state in which a resin parison corresponding to a through hole of a hollow body is cut off.

FIG. 4 is a flowchart showing specific steps of the method for manufacturing a resin tank according to the first embodiment of the present invention.

FIG. 5 is a front view showing a configuration of a main part of a washer tank manufactured by applying the method for manufacturing a resin tank according to the first embodiment of the present invention.

FIG. 6 is a bottom view showing the configuration of the main part of the washer tank manufactured by applying the method for manufacturing a resin tank according to the first embodiment of the present invention.

FIG. 7 is a mold surface (cavity) of a molding die corresponding to a pump fitting portion (undercut portion) of a washer tank manufactured by applying the method for manufacturing a resin tank according to the first embodiment of the present invention. ) Is a perspective view of the inside of FIG.

FIG. 8 is a schematic view showing a correspondence relationship between a pump fitting portion (undercut portion) and a molding die of a washer tank manufactured by applying the resin tank manufacturing method according to the first embodiment of the present invention. FIG.

FIG. 9 is a cross-sectional view showing the main steps of the method for manufacturing a resin tank according to the second embodiment of the present invention.

FIG. 10 is a cross-sectional view showing a main step of a method for manufacturing a resin tank according to a third embodiment of the present invention, in a state where a resin cavity is pressed against and closely adhered to a mold surface.

FIG. 11 is a cross-sectional view showing main steps of a method of manufacturing a resin tank according to a third embodiment of the present invention, in a state in which a resin parison corresponding to a through hole of a hollow body is cut off.

FIG. 12 is a cross-sectional view showing a main step of a method for manufacturing a resin tank according to a fourth embodiment of the present invention, in a state where a resin cavity is pressed against and closely adhered to a mold surface.

FIG. 13 is a cross-sectional view showing the main steps of the method of manufacturing a resin tank according to the fourth embodiment of the present invention, in a state where the resin parison corresponding to the through hole of the hollow body is cut off.

FIG. 14 is a view showing a modified example of the bladed tool applied to the resin tank manufacturing method according to the fourth embodiment of the invention.
It is sectional drawing corresponding to.

FIG. 15 is a cross-sectional view showing a modified example of the bladed tool applied to the resin tank manufacturing method according to the fourth embodiment of the invention.

FIG. 16 is a cross-sectional view showing a modified example of the bladed tool applied to the resin tank manufacturing method according to the fourth embodiment of the invention.

FIG. 17 is a cross-sectional view showing the main steps of the method for manufacturing a resin tank according to the fifth embodiment of the present invention, in a state in which a resin cavity is pressed against and closely adhered to the mold surface.

FIG. 18 is a cross-sectional view showing the main steps of the method of manufacturing a resin tank according to the fifth embodiment of the present invention, in a state where the resin parison corresponding to the through hole of the hollow body is cut off.

FIG. 19 is a cross-sectional view showing the main steps of a method for manufacturing a resin tank according to a modified example of the fifth embodiment of the present invention, in a state where a resin cavity is pressed against and closely adhered to the mold surface.

FIG. 20 is a cross-sectional view showing main steps of a method for manufacturing a resin tank according to a modification of the fifth embodiment of the present invention, in which a resin parison corresponding to a through hole of a hollow body is cut off. is there.

FIG. 21 is a cross-sectional view showing main steps of a method for manufacturing a resin tank according to a sixth embodiment of the present invention.

22A and 22B show a washer tank manufactured by a method for manufacturing a resin tank according to a sixth embodiment of the present invention, where FIG. 22A is a sectional view and FIG. 22B is a front view of a filter portion. .

FIG. 23 is a cross-sectional view showing the main steps of a method for manufacturing a resin tank according to a seventh embodiment of the present invention.

FIG. 24 is a perspective view showing main steps of a method for manufacturing a resin tank according to an eighth embodiment of the present invention.

FIG. 25 is a partially cutaway front view of a washer tank manufactured by general blow molding.

[Explanation of symbols]

10 Washer tank 12 through holes 14 Pump fitting part (undercut part) 16 pumps 30 Mold 32 Mold 34 cavity 35 convex 36 tool holes 38 Blade Tool 39 blade tool 40 cutting edge 41 cutting edge 43 blade tool 45 cutting edge 48 blade tool 50 cutting edge 52 Holding pin 58 Tool with blade 60 retaining groove 64 blade tool 66 retaining projection 70 blade tool 72 retaining recess 100 blade tool 104 blade tool 110 blade tool 114 auxiliary type 120A insert type 120B insert type T hollow body S cut piece P parison piece

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields investigated (Int.Cl. ⁷ , DB name) B29C 49/50 B65D 1/09 B65D 1/40 B60S 1/50

Claims (5)

(57) [Claims] 1. A method of manufacturing a resin tank having a through hole in a side wall portion, wherein a convex portion having a cylindrical shape corresponding to the through hole is inserted inside a mold surface of a molding die. A tool with a blade having a blade tip at the tip, which is provided in advance in the mold so as to project into a state, is arranged in the cylindrical convex portion, and the resin parison is expanded in the mold to obtain the resin. While pressing the parison against the molding die, the resin parison is brought into close contact with the peripheral wall of the convex portion to form a hollow body in a state where the inner peripheral wall surface of the through hole is molded by the peripheral wall of the convex portion, , The bladed tool is advanced toward the inside of the hollow body, the resin parison of the hollow body corresponding to the blade tip of the bladed tool is cut off to form the through hole, and the bladed tool is further formed. Is removed from the hollow body, and The take out the hollow body the through hole is formed open, method for producing a resin-made tank, characterized in that. 2. A heater is provided at a cutting edge portion of the bladed tool, and when the resin parison of the hollow body corresponding to the blade edge is cut by the bladed tool, the resin parison is cut while melting the resin parison. The method for manufacturing a resin tank according to claim 1, wherein 3. When the resin parison of the hollow body corresponding to the cutting edge is cut by the bladed tool, the cut piece is held by the bladed tool to separate the bladed tool from the hollow body. At this time, the cutting piece is removed from the hollow body together with the bladed tool, The method for manufacturing a resin tank according to claim 1, wherein 4. The through hole is formed by providing the convex portion in the vicinity of a die matching portion of a pair of male and female split molds, and molding the through hole. A method for manufacturing the resin tank described. 5. A cavity of the molding die is formed to mold an undercut portion in the hollow body, and the convex portion is provided near the molding die corresponding to the undercut portion to form the through hole. It molds, The manufacturing method of the resin tank in any one of Claim 1 thru | or 4 characterized by the above-mentioned.