JPH0716944A - Method and apparatus for molding hollow product - Google Patents

Abstract

PURPOSE:To provide a hollow product molding method requiring no special strength in a mold for secondary molding and obtaining the sufficient strength of a bonded part even if the area of the bonded area is small. CONSTITUTION:In primary molding, a first half hollow member A is molded by a movable mold 10 and, at the same time, a second half hollow member B is molded by a fixed mold 1. At this time, the first half hollow member A is molded so as to have revet-shaped body parts k, k... and the second half hollow member B is molded so as to have through-holes h, .... In secondary molding, the parts to be bonded of the first and second half hollow members A, B subjected to primary molding are opposed to pass the body parts k, k... through the through-holes h, h... and the tip parts of the body parts k, k... are caulked to obtain a hollow product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention molds a pair of first and second semi-hollow bodies by primary molding, and secondarily joins the joints of the first and second semi-hollow bodies molded by primary molding. The present invention relates to a method for molding a hollow body product, which is joined by molding to produce a hollow body product, and a mold device used for carrying out the molding method.

[0002]

2. Description of the Related Art As a method of manufacturing a synthetic resin hollow body product such as a plastic tank, a brake fluid tank, a spray tank, and a buoy, a molding method using a hollow molding machine and a molding method using an injection molding machine are known. When a hollow body product is manufactured by an injection molding machine, the hollow body product is formed as a half-hollow body or a divided body in the primary formation, the divided surfaces are abutted in the secondary formation, and the abutted portions are One hollow body product is manufactured by heating or welding. According to the molding method using this injection molding machine, it is possible to make a completely sealed hollow body product, a hollow body product having a uniform wall thickness, and to deal with complicated shapes. However, the present applicant has disclosed that
No. 2-87315 further improved the above molding method to provide a method for molding a hollow body product suitable for mass production. A set of molds is used to carry out the method. One mold is provided with a male mold and a female mold for forming one semi-hollow body, and the other mold is provided with a female mold and a male mold for forming the other semi-hollow body. And a mold are provided. This one
After forming a pair of semi-hollow bodies using a pair of molds, and abutting the joint surfaces of these semi-hollow bodies, a molten resin is injected to the periphery of the abutting surfaces to be integrated to obtain a hollow body product. It is like this.

[0003]

According to the above method, one mold is slid or rotated with respect to the other mold to abut a pair of semi-hollow bodies, and a molten resin is injected, whereby the hollow bodies are injected. Since a product can be obtained, there is an advantage that each process can be automated and a hollow body product can be mass-produced. Further, since the pair of semi-hollow bodies are molded by injection molding, the hollow body product having a complicated shape can be molded. Thus, although there are many advantages, points to be improved have been found. That is, according to the above method,
Since the pair of semi-hollow bodies are joined by joining the joints and by injecting a molten resin into the joined portions, the strength of the joint of the obtained hollow body product may not be sufficient. .

The strength of the joint is obtained by increasing the injection pressure when injecting the molten resin during the secondary molding to improve the adhesion between the joint of the semi-hollow body and the resin injected during the secondary molding. , Can be increased to some extent. Also, the fusion property can be increased by injecting the same resin as that of the semi-hollow body at the time of secondary molding. However, in order to increase the injection pressure, it is necessary to make the mold for secondary molding strong, and if the injection pressure is increased, the semi-hollow body obtained by the primary molding may be deformed. It is possible. Furthermore, if the same resin is injected during the secondary molding, the choice of resin becomes inflexible. Further, in the conventional molding method, when the area of the bonded portion is small, sufficient bonding strength may not be obtained. According to the above, the conventional method for molding a hollow body product cannot be said to be suitable as a method for manufacturing or molding a large or medium-sized tank, such as a kerosene tank, which requires relatively strong joints. . The present invention has been proposed to improve the above-mentioned problems, and specifically, a die for secondary molding does not require special strength, and the area of the joint is small. Even so, it is an object of the present invention to provide a molding method suitable for manufacturing a hollow body product which can obtain a sufficient strength of a joint and a mold apparatus used for carrying out the method.

[0005]

The invention according to claim 1 is
In order to achieve the above object, in the primary molding,
The two semi-hollow bodies are molded by a pair of molds so that each joint has an engaging portion, and in the second molding, the joints of the first and second semi-hollow bodies molded by the first molding are formed. The engaging portions are opposed to each other and the engaging portions are deformed to obtain a hollow body product. In the second aspect of the invention, the first and second semi-hollow bodies are
Molded by a pair of molds so that each joint has an engaging portion, and in the secondary molding, the joining portions of the first and second semi-hollow bodies molded by the primary molding are opposed to each other, and the engaging portion is formed. To engage each other, and to weld the vicinity of the engaging portion,
According to the invention of claim 3, in the primary molding, the first,
The two semi-hollow bodies are molded by a pair of molds so that at least one first semi-hollow body has an engaging portion at the joint, and in the second molding, the first semi-hollow body is molded by the first molding. The joining parts of the two semi-hollow bodies are opposed to each other, and the engaging part of the first semi-hollow body is bent toward the second semi-hollow body of the other side to obtain a hollow body product. The invention as set forth in claim 4 relating to the mold device comprises a fixed mold and a movable mold, and one mold of these molds has a core and a recess at a predetermined interval, and the other mold. Each of the molds is provided with a recess that cooperates with the core, and when the mold is clamped, a first cavity is formed in which the core and the recess form a first semi-hollow body. And a second mold, a second cavity for molding a second semi-hollow body is formed between the first mold and the other mold, and the first semi-hollow body is provided with an engaging portion around the core of the first mold. And a core for molding the engaging portion in the second semi-hollow body, respectively. The invention according to claim 5 comprises a fixed mold and a movable mold, and one of these molds has a core for forming a first semi-hollow body,
A concave portion for molding the second semi-hollow body is provided, a concave portion that cooperates with the core is provided in the other mold, and when the mold is clamped, the core and the concave portion are formed. A first cavity in which the first semi-hollow body is molded and a second cavity in which the second semi-hollow body is molded are formed between the recess and the other mold, and the one mold is also formed. A cavity for molding the engaging portion is provided around the core.

[0006]

The invention according to claims 4 and 5 operates as follows. That is, the movable mold is clamped to the fixed mold.
Then, a first cavity in which the first semi-hollow body is molded is formed by the core and the concave portion, and a second cavity in which the second semi-hollow body is molded is formed between the concave portion and the other mold. . Therefore, the molten resin is injected into the first and second cavities. Then, the first semi-hollow body is molded by the first cavity and the second semi-hollow body is molded by the second cavity. At this time, in the invention according to claim 4, an engaging portion is formed in the first semi-hollow body A, and an engaging portion is also formed in the second semi-hollow body B. The mold is opened and, for example, the second semi-hollow body is taken out and fitted to the first semi-hollow body. That is, the engaging portions of the first and second semi-hollow bodies are engaged. The engaging portion is deformed or deformed and fused in the engaged state. Thereby, the first and second semi-hollow bodies are integrated. Take out the hollow body product. Thereafter, the same operation is repeated to obtain a hollow body product. In the invention according to claim 5, since the engaging portion is formed in the first semi-hollow body, for example, the mold is opened, the second semi-hollow body is taken out, and the first semi-hollow body is fitted. Then, the engaging portion is bent toward the second semi-hollow body in the state of being aligned. Thereby, the first and second semi-hollow bodies are integrated to obtain a hollow body product.

[0007]

EXAMPLE A molding method according to this example is a primary molding method in which a pair of first and second semi-hollow bodies having a split shape are molded by respective molds, and a pair of primary molding methods obtained by this primary molding method. The secondary molding method comprises manufacturing the hollow body product by deforming or bending the engaging portion of the joint portion of the first and second semi-hollow bodies. Alternatively, the secondary molding method comprises manufacturing the hollow body product by deforming the engaging portion and fusing or welding the vicinity of the engaging portion. The type of resin for molding the pair of first and second semi-hollow bodies and the type of resin fused in the secondary molding are not particularly limited. For example, a pair of first,
2 Semi-hollow body is molded with polyphenylene sulphate PPS, and secondary molding is with polyamide PA, nylon PA6, polyphenylene sulphate PPS, polycarbonate P
C, polybutylene terephthalate PBT, etc. can be applied. When the same type of resin is applied to the primary molding and the secondary molding, the resin is well compatible and the fusion bondability of the joint is improved even if the resin is injected at low temperature and low pressure. Further, since the types of resin are the same, there is an advantage that the resin can be directly melted and recycled. In this embodiment, as shown in FIG. 1, the mold device used for carrying out the above-described molding method is composed of a fixed mold, a movable mold, a caulking device, a robot and the like.

First, an embodiment of the die unit will be described.
As shown in FIG. 1, the mold device takes out a fixed mold 1 on the fixed plate side, a movable mold 10 on the movable plate side that makes a pair with the fixed mold 1, a semi-hollow body or a hollow body product. The robot 20 includes a caulking device 30 used for secondary molding and the like.

A core 2 for forming a first semi-hollow body A of a hollow body product S made of synthetic resin in cooperation with a cavity of a movable mold 10 to be described later is provided above the fixed mold 1 in the figure. ing. The core 2 is formed in a substantially rectangular parallelepiped shape, and is provided so as to protrude from the parting line of the fixed mold 1. Therefore, the first semi-hollow body A molded by the core 2 has a box shape. Around the core 2, a plurality of small-diameter rivet-shaped body-forming cavities 3, 3, ... Are provided at predetermined intervals. These cavities 3, 3, ... Are deeper than the second cavity 9 described later. A shallow second recess 4 is provided below the core 2. The second recess 4 cooperates with the core or the parting surface of the movable mold 10 to form the second cavity 9. A second semi-hollow body B of the hollow body product S is molded by the second cavity 9. Second recess 4
Is formed as a shallow dent, the second semi-hollow body B molded in the second cavity 9 also has a plate shape or a lid shape.

At the periphery of the second recess 4, there are provided cores 5, 5, ... For forming through holes. Through-hole molding core 5,
5, ... are cavities 3 for forming a rivet-shaped body,
, Which form a pair, and are provided at the same pitch as the cavities 3, 3 ,. And the through-hole molding core 5,
The outer diameter of 5, ... Is larger than the inner diameter of the cavities 3, 3 ,. It should be noted that the fixed mold 1 is provided with ejector pins 6 and 6 that can move back and forth, and a second cavity formed in the second cavity 4.
The semi-hollow body B is taken out by these ejector pins 6, 6. Further, a sprue 7 having a gradient of about 3 to 6 degrees is provided in the substantially central portion of the fixed mold 1, and the resin injected from the nozzle 8 of the injection machine passes through the sprue 7 and the second cavity 4, which will be described later. The first cavity 13 and the like are filled.

The movable mold 10 is provided with a recess 11 which makes a pair with the core 2 of the fixed mold 1. The diameter of the recess 11 is larger than the diameter of the core 2 by a predetermined amount and is deeper than the protruding amount of the core 2. Therefore, when the movable mold 10 is clamped to the fixed mold 1, the first cavity 12 is formed between the inner peripheral surface of the recess 11 and the outer peripheral surface of the core 2 at a predetermined interval. Thus, the first semi-hollow body A having a predetermined thickness is molded. Ejector pins 13, 13, ..., 14 are provided on the movable mold 10 so as to be movable back and forth, and the first semi-hollow body A, that is, the hollow body product S is taken out by these ejector pins 13, 13 ,. Has become.

In this embodiment, the mold device is a robot 20 for taking out the first and second semi-hollow bodies A and B and the hollow body product S.
Is also equipped. In addition, the caulking machine 3 used for secondary molding
It also has 0. A main body of the robot 20 is not shown, but a first arm 21 extends from the main body, and a second arm 22 is pivotally attached to the first arm 21. A vacuum suction disk 23 is provided at the tip of the second arm 22, for example. The caulking machine 30 also includes an arm 31 operated by a robot, for example. The frame 3 is attached to the tip of the arm 31.
2 is attached, and a plurality of caulking tools 33, 33, ... Which are heated by a heater are attached to the frame 32. The caulking tools 33, 33, ... Are cavities 3 and 3 for forming a rivet-shaped body provided in the fixed mold 1.
Corresponds to the number and interval of. And caulking tool 3
A hemispherical recess 34 larger than the diameter of the cavities 3, 3, ... Is formed at the tip of each of the 3, 33 ,.

Next, a molding method for manufacturing a hollow body product S made of synthetic resin by using the above mold device will be described. The movable mold 10 is butted against the fixed mold 1, and the mold is clamped by a conventionally known means. Then, the state shown in FIG. 2 is obtained. That is, the core 2 of the fixed mold 1 is located in the recess 11 of the movable mold 10, and the core 2 and the recess 11 allow the first cavity 1 to move.
2 is formed. At this time, the first cavity 12 and the rivet-shaped cavity forming cavities 3, 3, ...
The second recess 4 of the fixed mold 1 is closed by the parting surface of the movable mold 10 to form the second cavity 9. And although not shown accurately in the figure, these first and second cavities 12, 9 etc. communicate with the sprue 7 via a gate.

From the nozzle 8 of the injection machine, the plasticized molten resin J is injected into the sprue 7. Molten resin J flows from the sprue 7 through the runner and gate to the first cavity 1
2, the rivet-shaped body forming cavities 3, 3, ... And the second cavity 9 are filled. The state where the injection filling is completed is shown in FIG. This completes the primary molding. When the molten resin J is cooled and fixed, as shown in FIG. 4, the first cavity 12 forms the first semi-hollow body A. The rivet-shaped bodies k, k, ... Are simultaneously molded. Further, the second semi-hollow body B is molded in the second cavity 9, and through holes h, h, ... For engagement are simultaneously formed in the periphery thereof.

Next, in the mold opening step, the movable mold 10 is separated from the fixed mold 1. Then, as shown in FIG. 4, the suction plate 23 of the robot 20 sucks the second semi-hollow body B and drives the first arm 21 to align the first semi-hollow body A. That is, the rivet-shaped body parts k, k, ... Of the first semi-hollow body A are passed through the through holes h, h, ... of the second semi-hollow body B, and the second semi-hollow body is joined to the first semi-hollow body A. The faces of the body B, that is, the joints are butted. Then, the tips of the rivet-shaped body parts k, k, ... Are exposed to the outer surface of the second semi-hollow body B. This state is shown in FIG. Therefore, as shown in FIG. 6, the caulking machine 30 is advanced between the fixed mold 1 and the movable mold 10, and the concave parts 34, 34 of the caulking tools 33, 33, ... , Are pressed against the tips of the rivet-shaped bodies k, k ,. The tip has a large diameter like a rivet head and is deformed to form caulked portions r, r, .... With this, the first and second semi-hollow bodies A,
B becomes one body. Then, as shown in FIG.
The ejector pins 13, 13 and 14 project and the hollow body product S made of synthetic resin is taken out from the movable mold 10. Then, the molded body P molded by the sprue 7 is cut and removed,
The hollow body product S made of synthetic resin shown in FIG. 9 is manufactured.

According to this embodiment, the first and second semi-hollow bodies A,
Since B is integrated by deforming the tips of the rivet-shaped bodies k, k, ... Like a rivet head, the strength of the joint is large. Therefore, it is excellent as a molding method for a large tank or the like. In the primary molding,
Since the two semi-hollow bodies A and B are molded at the same time by the same molds 1 and 10, the efficiency is good and mass production is possible. Further, since secondary molding is performed using the same molds 1 and 10, the effect that the mold is inexpensive and the hollow body product S can be manufactured at low cost can be obtained.

In this embodiment, the first semi-hollow body A is formed with rivet-shaped bodies k, k, ... And the second semi-hollow body B is formed with through holes h, h ,. On the contrary, it is apparent that the same can be done by forming the through holes h, h, ... In the first semi-hollow body A and forming the rivet-shaped body protrusions k, k in the second semi-hollow body B. Further, in this embodiment, the first semi-hollow body A
Is formed into a hemispherical shape, and the second semi-hollow body B is formed into a plate shape, but it is clear that the second semi-hollow body B can also be formed into a hemispherical shape. At this time, in the secondary molding, the second semi-hollow body B can be moved toward the first semi-hollow body A.
Further, in the secondary molding, another mold or holder can be used. Furthermore, in the above embodiment,
The rivet-shaped body parts k, k, ... Are deformed by a heated caulking tool, but the second semi-hollow body B is vibrated by a caulking tool using an ultrasonic transducer to form the through holes h, h ,. It is also possible to crimp by the frictional heat generated in the rivet-shaped bodies k, k, ... Although not shown in the figure,
When the joint portion of the second semi-hollow body B is abutted against the joint portion of the semi-hollow body A, an O-ring may be interposed to manufacture a hollow body product S having high airtightness.

In the embodiment described above, the rivet-shaped body k,
The first and second semi-hollow bodies A and B are integrated by deforming the tip portions of k, ... Like a rivet head, but the shape of the rivet-shaped body portions k, k ,. Obviously, the shape can also be used. In addition, the rivet-shaped body parts k, k,
When the tip end portion of ... Is deformed by heating, the heating temperature and the heating time may be increased to weld the rivet-shaped body portions k, k, ... And part of the through holes h, h ,. Further, it is also possible to inject and fuse the resin to the portion where the rivet-shaped body portions k, k, ... And the through holes h, h ,. At this time, a part of the joint portion can be welded at the same time. In the above-described embodiment, the first semi-hollow body A has rivet-shaped body portions k, k, ...
8 is molded, and these rivet-shaped bodies k, k, ... Are caulked and deformed, but an example in which a part of the joint is deformed instead of caulking is shown in FIG. Although FIG. 8 does not show an embodiment such as a mold for molding the first and second semi-hollow bodies A ′ and B ′ and a tool for deforming the first and second semi-hollow bodies A ′ and B ′, according to the present embodiment, the first semi-hollow body A is formed. A flange Tb extending outward in the radial direction is formed at the open end, that is, the joint, and an engaging portion Ke indicated by a two-dot chain line is formed upward from the outer peripheral side surface of the flange Tb. The engaging portion Ke is formed in a plurality of divided shapes, and a convex portion T or a concave-convex portion To is formed inside the engaging portion Ke as shown in (a) and (b) of FIG. The second semi-hollow body B ′ forming a pair with the first semi-hollow body A ′ is also formed in a plate shape in this embodiment, and the concave portion W or the convex concave portion Wj is formed on the upper surface of the joint portion. Also in this example, the first and second semi-hollow bodies A ′ and B ′ in the primary molding are
Molded simultaneously in each mold. Then, as described above, the one second semi-hollow body B ′ is superposed on the other first semi-hollow body A ′ with the O-ring R or the like interposed therebetween as shown in the drawing. Then, the engaging portion Ke is bent on the second semi-hollow body B ′ while being heated by, for example, a device with a heater, and integrated to obtain a hollow body product S ′. According to this embodiment, the convex portion T or the concave-convex portion To of the engaging portion Ke formed on the first semi-hollow body A ′ is engaged with the concave portion W or the convex concave portion Wj of the second semi-hollow body B ′, respectively. Therefore, it is excellent as a method for molding a hollow body product in which the strength of the joint is required. It is apparent that the same effects as those of the above-described embodiments can be obtained as a whole by this embodiment as well.

[0019]

As described above, according to the present invention, in the primary molding, the first and second semi-hollow bodies are molded by a pair of molds so that each joint has an engaging portion, and In the second molding, the first and second semi-hollow bodies formed by the first molding are made to face each other and the engaging portions are engaged with each other, and the engaging portions are deformed, deformed and welded or bent to form the first portion. 2. Since a hollow body product is manufactured by integrating two semi-hollow bodies, a hollow body product having a large strength at the joint portion is manufactured as compared with a hollow body product obtained by simply welding or fusing the joint portion. be able to. Therefore, it is possible to manufacture a hollow body product in which the strength of the joining portion is sufficiently high even if the area of the joining portion is small, even if the die for secondary molding, the holder, etc. are not required. Further, according to the invention of the mold apparatus, one mold is provided with a core for forming the first semi-hollow body and a recess for molding the second semi-hollow body, and the other mold is provided. Has a recess for cooperating with the core, and a cavity for molding the engaging portion, so that the pair of molds has the first and second semi-hollow bodies and the engaging portion. So that they can be molded simultaneously. Moreover, since the first and second semi-hollow bodies are molded in the respective first and second cavities, for example, the second semi-hollow body molded in the second cavity is replaced by the first semi-hollow body remaining in the first cavity. According to the hollow body, there is also an effect that the secondary molding for deforming, deforming and welding the engaging portion can be easily performed with the same mold.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view showing an exploded view of an embodiment of a mold apparatus of the present invention.

FIG. 2 shows a state in which the mold of the mold device is clamped,
It is a partially cutaway sectional view.

FIG. 3 is a partially cutaway cross-sectional view showing a state where molten resin is injected into a mold of a mold device.

FIG. 4 is a cross-sectional view showing a state where the mold is opened and the second semi-hollow body is taken out by a robot.

FIG. 5 is a cross-sectional view showing a state where the second semi-hollow body is aligned with the first semi-hollow body by opening the mold.

FIG. 6 is a cross-sectional view showing a state in which the second semi-hollow body is aligned with the first semi-hollow body, and a caulking tool is pressed against the tip end portion of the rivet-shaped body to perform caulking.

FIG. 7 is a side view showing a state where a hollow body product is taken out. .

FIG. 8 is a cross-sectional view showing another embodiment of the engaging portion.

FIG. 9 is a perspective view showing a part of the hollow body product manufactured according to the present embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Fixed die 2 Cavity for forming a rivet-like body 9 Second cavity 10 Movable die 12 First cavity A First semi-hollow body B Second semi-hollow body S Hollow body product k Rivet-like body (engagement part ) H Through hole (engagement part)

[Procedure amendment]

[Submission date] August 5, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

EXAMPLE A molding method according to this example is a primary molding method in which a pair of first and second semi-hollow bodies having a split shape are molded by respective molds, and a pair of primary molding methods obtained by this primary molding method. The secondary molding method comprises manufacturing the hollow body product by deforming or bending the engaging portion of the joint portion of the first and second semi-hollow bodies. Alternatively, the secondary molding method comprises manufacturing the hollow body product by deforming the engaging portion and fusing or welding the vicinity of the engaging portion. The type of resin for molding the pair of first and second semi-hollow bodies and the type of resin fused in the secondary molding are not particularly limited. For example, a pair of first,
2 Semi-hollow body is molded with polyphenylene sulphite PPS, and secondary molding is with polyamide PA, nylon PA6, polyphenylene sulphite PPS, polycarbonate P
C, polybutylene terephthalate PBT, etc. can be applied. When the same type of resin is applied to the primary molding and the secondary molding, the resin is well compatible and the fusion bondability of the joint is improved even if the resin is injected at low temperature and low pressure. Further, since the types of resins are the same, there is an advantage that they can be directly melted and recycled .
In this embodiment, as shown in FIG. 1, the mold device used for carrying out the above-described molding method is composed of a fixed mold, a movable mold, a caulking device, a robot and the like.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

At the periphery of the second recess 4, there are provided cores 5, 5, ... For forming through holes. Through-hole molding core 5,
5, ... are cavities 3 for forming a rivet-shaped body,
, Which form a pair, and are provided at the same pitch as the cavities 3, 3 ,. And the through-hole molding core 5,
The outer diameter of 5, ... Is larger than the inner diameter of the cavities 3, 3 ,. In addition, the fixed mold 1 is provided with ejector pins 6 and 6 so as to be movable back and forth, and a second cavity 9 is molded in the second cavity 9 .
The semi-hollow body B is taken out by these ejector pins 6, 6. In addition, a sprue 7 having a gradient of about 3 to 6 degrees is provided at a substantially central portion of the fixed mold 1, and the resin injected from the nozzle 8 of the injection machine passes through the sprue 7 into the second cavity 9 , which will be described later. The first cavities 12 and the like are filled.

Claims (5)

[Claims] 1. In the primary molding, the first and second semi-hollow bodies A and B are provided with engaging portions k, k ..., H, h ,. And in the secondary molding, the first molded by the primary molding,
(2) The engaging portions k, with the joint portions of the semi-hollow bodies A and B facing each other,
A method for molding a hollow body product, in which k ... Is engaged with each other and the engaging portions k, k ... Are deformed to obtain a hollow body product S. 2. In the primary molding, the first and second semi-hollow bodies A and B are provided with engaging portions k, k ..., H, h ,. And in the secondary molding, the first molded by the primary molding,
2 The engaging portions k, k are made such that the joint portions of the semi-hollow bodies A, B face each other.
Are engaged with each other and the engaging parts k, k are deformed, and the vicinity of the engaging parts k, k ..., h, h, ... Are welded or fused to obtain a hollow product S. Body product molding method. 3. In the primary molding, the first and second semi-hollow bodies A ′ and B ′ are engaged with a pair of molds 1 and 10 at at least one of the joint portions of the first semi-hollow body A ′. Molded so as to have the parts ke, ke ... And in the secondary molding, the first molded by the primary molding,
The two semi-hollow bodies A'and B'are made to face each other so that the engaging portions ke, ke ...
A method for molding a hollow body product, which comprises bending the semi-hollow body B'to obtain a hollow body product S. 4. A fixed mold 1 and a movable mold 10,
One of the molds 1 and 10 has a core 2 and
A predetermined space is provided between the recess 4 and the other mold 10.
Recesses 11 that cooperate with the core 2 are provided in each of the cores, and when the molds 1 and 10 are clamped, the first semi-hollow body A is molded by the core 2 and the recesses 11. A cavity 12 and a second cavity 9 for molding a second semi-hollow body B are respectively formed between the recess 4 and the other mold 10, and the core 2 of the one mold 1 is formed. Around the first semi-hollow body A
The cavities 3, 3 ... for molding the engaging portions k, k ...
However, around the concave portion 4, cores 5, 5, ... For molding the engaging portions h, h, ... In the second semi-hollow body B are respectively provided. . 5. A fixed mold and a movable mold, one of these molds having a core for forming a first semi-hollow body A ′ and a second semi-hollow body B ′. And a recess for cooperating with the core is provided in the other mold, and when the mold is clamped, the first semi-hollow body is formed by the core and the recess. A first cavity in which A ′ is molded and a second cavity in which a second semi-hollow body B ′ is molded are formed between the recess and the other mold, and Around the core, engaging portions ke, ke ...
A mold apparatus, which is provided with a cavity for molding.