JP3394007B2 - Method and apparatus for manufacturing synthetic resin hollow body - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing method for manufacturing a synthetic resin hollow body by abutting a pair of synthetic resin halves and joining the two halves at the abutting portion. And its equipment.

[0002]

2. Description of the Related Art Conventionally, as a method for producing a synthetic resin hollow body, as shown in, for example, Japanese Patent Application Laid-Open No. 7-217755, a pair of male mold forming portions for molding a half-divided body in one mold, A female mold forming part is provided, and a half mold is simultaneously formed using a pair of mold devices in which the other mold is provided with a female mold forming part and a male mold forming part facing these forming parts. After the primary injection), slide one mold against the other to make the half halves left in each female mold part abut against each other, then clamp the mold, and apply molten resin to the periphery of this abutment part. A method using a slide-type injection molding method (so-called die slide injection (DSI) molding method) in which both are joined by injection (secondary injection) is known. According to the method using the DSI method, the productivity can be significantly improved compared with the conventional method in which the molding of the half-divided body and the abutting / joining are performed in completely different steps, and the conventional bonding is performed. It is possible to more stably secure the joining strength and the sealing property of the abutting portion, as compared with the case where the halves are joined together by heat fusion.

In the above-mentioned DSI method, usually, a set of a male molding part and a female molding part is provided in each mold in a relative sliding direction, and one pair is formed every two relative sliding motions of the mold. It is possible to obtain individual hollow bodies.
As a method capable of further increasing the productivity in the method, for example, in Japanese Patent Laid-Open No. 4-331117 or Japanese Patent Laid-Open No. 4-331123, the molding parts of male and female molds as described above are provided for each mold. The so-called double DSI method is disclosed in which the groups are provided in parallel (that is, in a double row in the direction orthogonal to the mold sliding direction). According to the double-row (double) DSI method, one hollow body can be obtained for each die sliding operation, and the productivity can be further improved. Further, since the injection amount of the molten resin for each injection (shot) is constant, there is no need to change the injection amount for each shot (alternately) unlike the above-mentioned single-type (single) type DSI method, and molding is possible. It is possible to simplify the control of the resin injection amount at the time. Therefore, a special molding machine capable of controlling such injection conditions (resin injection amount, etc.) is not required, and a general-purpose molding machine can be adopted.

Another method for producing a synthetic resin hollow body with high production efficiency is, for example, Japanese Patent Publication No. 7-4830.
As disclosed in Japanese Patent Laid-Open Publication No. JP-A-2003-264, a molding die which is openably and closably combined with each other, one of the dies is rotatable with respect to the other by a predetermined angle, and each die is rotated in a rotating direction at each predetermined angle. Relative rotation of both molds using a rotary injection molding mold provided with a molding part consisting of at least one male molding part and two female molding parts in a repeating sequence of / female / female Each half (for example, forward / reverse operation) is molded and joined with a pair of abutted half halves so that a finished product can be obtained with each rotation of the die. Injection molding (so-called die rotary injection (DR
I) method) is known. In this DRI method as well, as in the case of the double DSI method described above, the injection amount of the molten resin for each injection (shot) is constant, so the control of the resin injection amount during molding can be simplified. It is possible to use a general-purpose molding machine.

However, in the double DSI method and the DRI method, the pressure receiving portion of the die on which the injection pressure acts during the injection molding (that is, except for the resin passage portion of the die, roughly, molding for the half-split body). Since the projected area in the mold clamping direction of the cavity and the periphery of the abutting part of the half-divided body for the joining resin) becomes large, the mold clamping required when both molds are closed and the mold is clamped accordingly. The power also increases. For this reason, there is a problem that the molding apparatus becomes large in size, which is particularly disadvantageous and difficult to apply, especially when the size of the molded product is large.

Regarding such a problem, for example, Japanese Patent Laid-Open No. 63-63
-237917 or Japanese Patent Laid-Open No. 10-58487.
In the gazette, a movable inner mold is provided between a pair of molds that can be opened and closed (a fixed mold and a movable mold), and female mold parts are formed on both molds. A pair of half halves is molded by injection molding with a male mold forming part, with the middle mold being advanced and interposed between the two molds, and then the middle mold. A molding method is disclosed in which the mold halves held by the female mold molding portion of each mold are abutted and joined by retracting and clamping both molds.

According to this molding method, since the pair of half halves are simultaneously molded in series in the direction in which the mold clamping force acts, the pressure receiving portion of the mold on which the injection pressure acts during injection molding. The projected area in the mold clamping direction does not become particularly large, and it is possible to avoid an increase in the size of the molding apparatus. That is, in the case of this molding method, if the projected area of the molding cavity for one half-divided body in the mold clamping direction is S, in the mold clamping direction of the pressure receiving portion of the mold on which the injection pressure acts during injection molding. The maximum value of the projected area is S. On the other hand, in the case of the DRI method, for example, the pair of half halves are simultaneously molded at two positions separated in the same mold surface orthogonal to the direction of the mold clamping force, so that the half halves are molded. When the projected area of the annular passage portion for filling the bonding resin around the abutting portions of the bodies is about 10% of the projected area of the molding cavity for the half-split body, the maximum value is about 2.1S. In other words, the maximum required mold clamping force for injection molding a molded product of the same size is less than half that of the DRI method.

[0008]

However, in this conventional molding method, it is true that the above-mentioned double DSI method or DR method is used.
Although the size of the molding equipment can be reduced compared to method I,
Since it is necessary to perform injection and mold opening / closing operations twice each to obtain one finished product, the production efficiency is significantly reduced. As described above, conventionally, it has been difficult to achieve both avoiding the increase in the size of the molding apparatus and ensuring the production efficiency.

Therefore, according to the present invention, when a synthetic resin hollow body is manufactured, a high product efficiency is maintained by obtaining a finished product each time the mold is opened, and the size of the molding apparatus is suppressed. The present invention is made for the purpose of providing a manufacturing method and an apparatus therefor.

[0010]

Therefore, the first aspect of the present invention is as follows.
The manufacturing method according to the invention (hereinafter referred to as the first invention) is a synthetic resin hollow by causing a pair of synthetic resin halves to collide with each other and joining both halves at the abutting portion. A manufacturing method for manufacturing a body, wherein a back-to-back arrangement is made between the female mold forming portions of one of the two forming molds each having a pair of molds having female mold forming portions facing each other. With the intermediate mold provided with the pair of male mold parts provided, and the female mold parts of the other mold holding the pair of half halves molded in the previous cycle, respectively. A mold clamping step of closing the molds and clamping them, and a molten resin is injected into the cavity formed by each of the molds after the mold clamping step so that the male mold part and the female mold part are formed in the one mold. A pair of halves for the cycle is formed in combination with the molding part. In addition, in the other molding die, an injection step of injecting a molten resin into the abutting portion of the half halves of the previous cycle by joining the female die forming portions with each other and joining the two, and after the injection step, A mold opening step of opening both molds, a product removing step of taking out a hollow body formed by joining the half halves of the previous cycle from the other mold after the mold opening step, and the mold opening step After that, a mold moving step of changing the relative position of the intermediate mold and the mold so that the male mold part of the intermediate mold is located between the female mold parts of the other mold. By repeating the above steps, a hollow body in which a pair of half-divided bodies are joined together is obtained for each opening / closing operation of the two molding dies. Further, the manufacturing method according to the invention of claim 2 of the present application (hereinafter referred to as the second invention) is such that a pair of synthetic resin halves are abutted against each other,
A method for manufacturing a hollow body made of synthetic resin by joining both half halves at this abutting part, wherein two sets of moldings each having a pair of molds having female mold molding parts facing each other are formed. An intermediate die having a male die forming portion is located between the female die forming portions of one of the die and a die thickness adjusting plate is located on the back surface of the other die, and the other die In the state where the pair of half halves formed in the previous cycle are held in each female mold forming part, the mold clamping process of closing both molds and clamping the mold, and the molding process after the mold clamping process. Injecting molten resin into the cavity formed by the mold,
In the one molding die, a pair of half halves for the cycle is molded by a combination of a male molding portion and a female molding portion, and in the other molding die, a combination of female molding portions is used. An injection step of injecting a molten resin into the abutting part of the two halves of the cycle to join the two, a mold opening step of opening the molding dies after the injection step, and a mold opening step after the mold opening step , A product take-out step of taking out a hollow body formed by joining the half-split bodies of the previous cycle from the other molding die, and after the mold opening step, the male mold forming portion of the intermediate mold is A mold moving step of changing the relative position of the intermediate mold and the molding mold is performed so that the mold thickness adjusting plate is positioned between the female molding parts and on the back surface of one molding mold. Then, by repeating the above steps, each opening / closing operation of both the molding dies,
It is characterized in that a hollow body obtained by joining a pair of half-divided bodies is obtained.

Further, in the manufacturing apparatus according to the invention of claim 3 of the present application (hereinafter referred to as the third invention), a pair of synthetic resin halves are made to abut against each other, and at the abutting portion, the two halves are joined together. A manufacturing apparatus for manufacturing a hollow body made of synthetic resin by joining together, which has a pair of molds each having a pair of female mold forming parts facing each other, and the mold opening directions are the same and arranged in parallel. First and second sets of forming dies provided, forming die opening and closing means for opening and closing the first and second forming dies, respectively, and a pair arranged back to back combined with the female forming unit. An intermediate mold having a male mold forming part, the male mold forming part being located between the female mold forming parts of the first forming mold or between the female mold forming parts of the second forming mold, and the first and second forming parts. Each time the mold is opened and closed, the male molding part forms the female mold of the first molding die. Between the first mold and the second mold, the mold moving means for relatively moving the intermediate mold and the mold so as to be alternately positioned between the mold and the female mold part of the second mold. An injection unit for injecting the molten resin into each formed cavity tee, and a control unit for controlling the operations of the injection unit, the mold opening / closing unit, and the mold moving unit. Then, for each one-time opening / closing operation of the first and second molding dies, a pair of half halves for the cycle is molded by a combination of the male molding part and the female molding part, and the female mold molding is performed. Injection molding is performed by injecting molten resin into the abutting part of the half halves of the previous cycle by combining the parts and joining the two, and a pair of half halves is provided for each opening / closing operation of the above molds. The feature is to obtain a hollow body in which the bodies are joined together. Furthermore, claim 4 of the present application
The manufacturing apparatus according to the invention (hereinafter, referred to as the fourth invention) is a hollow synthetic resin by causing a pair of synthetic resin halves to abut against each other and joining the two halves at the abutting portion. A manufacturing apparatus for manufacturing a body, comprising first and second molds each having a pair of molds having a pair of female mold forming sections facing each other and having mold opening directions in the same direction and arranged in parallel. Two sets of molding dies, a molding die opening / closing means for opening and closing the first and second molding dies, respectively, and a male molding part to be combined with the female molding part. 1
An intermediate die located between the female die forming portions of the forming die or between the female die forming portions of the second forming die, and the intermediate die having the first and second portions.
The mold thickness adjusting plate located on the back surface of the other molding die in a state of being combined with one of the molding dies, and the male molding portion for each opening / closing operation of the first and second molding dies. Mold moving means for relatively moving the intermediate mold and the mold so that the two molds are alternately positioned between the female mold parts of the first mold and between the female mold parts of the second mold. Injection means for injecting the molten resin into each cavity tee formed by closing the first and second molding dies, and a control means for controlling the operations of the injection means, the molding die opening / closing means and the mold moving means. Is equipped with. Then, for each one-time opening / closing operation of the first and second molding dies, a pair of half halves for the cycle is molded by a combination of the male molding part and the female molding part, and the female mold molding is performed. Injection molding is performed by injecting molten resin into the abutting part of the half halves of the previous cycle by combining the parts and joining the two. The feature is to obtain a hollow body in which the bodies are joined together.

Further, the invention according to claim 5 of the present application (hereinafter referred to as the fifth invention) is the same as the third or fourth invention, wherein the mold moving means is orthogonal to the opening and closing directions of the two molding dies. In this direction, the intermediate die and the forming die are slid relative to each other.

Further, the invention according to claim 6 of the present application (hereinafter referred to as the sixth invention) is the same as the third or fourth invention, wherein the mold moving means is orthogonal to the opening / closing direction of both the molding dies. It is characterized in that the intermediate die and the molding die are relatively rotationally moved along the surface.

Furthermore, the invention according to claim 7 of the present application (hereinafter referred to as the seventh invention) is the same as the above-mentioned sixth invention.
The die moving means is characterized in that the intermediate die is driven to rotate and move with respect to the forming die.

Furthermore, the invention according to claim 8 of the present application (hereinafter referred to as the eighth invention) is the same as the above-mentioned sixth invention.
The die moving means is characterized in that the die is driven to rotationally move with respect to the intermediate die.

Further, the invention according to claim 9 of the present application (hereinafter referred to as the ninth invention) is the invention according to any one of the fourth to eighth inventions, wherein the intermediate mold is a back-to-back pair. It is characterized by including a male molding part.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. First, the first aspect of the present invention
The embodiment will be described. FIG. 1 is a vertical cross-sectional explanatory view schematically showing the structure of the molding apparatus according to the first embodiment in a mold open state, and FIGS. 2 and 3 are the fixed-side mold mechanism, the intermediate mold mechanism, and the movable mold mechanism of the molding apparatus, respectively. FIG. 4 is a perspective view schematically showing the structure of the side die mechanism, and FIG. 4 is an explanatory view schematically showing the fixed side die mechanism of the molding apparatus, which is Y4-Y in FIG.
4 is an arrow view seen from the direction of the arrow, and FIG. 5 is an explanatory view schematically showing the fixed-side mold mechanism and the intermediate mold mechanism of the molding apparatus, which are seen from the direction of the arrows Y5-Y5 of FIG. FIG.

As shown in these drawings, the molding apparatus 1 according to the present embodiment has, as basic components, a fixed side mold mechanism 10 fixed to an injection molding machine (not shown),
The stationary mold mechanism 10 is provided with a movable mold mechanism 30 that is openable and closable, and an intermediate mold mechanism 50 located between the mold mechanisms 10 and 30. In each of the following embodiments, for example, as shown in FIGS. 1 to 5, the movable side mold mechanism, the fixed side mold mechanism, and the intermediate mold mechanism are arranged to face each other in the horizontal (horizontal) direction. However, the arrangement structure of these mold mechanisms actually attached to the molding machine (not shown) is not limited to the horizontal (left and right) arrangement, and for example, even if they are arranged to face each other in the vertical direction. good.

The fixed-side mold mechanism 10 has first and second mold-opening directions which are the same and arranged in parallel (in the present embodiment, the mold-opening directions are horizontal and arranged vertically in parallel). Two fixed molds 11 and 12 and both fixed molds 1
The resin supply mold part 13 arranged between the first and the second parts 12 and 12 is provided in the approximate center. Recessed female mold parts F1R and F2R are provided on the mating surfaces of the fixed molds 11 and 12, respectively. The resin supply mold part 13 is connected to an injection head (not shown) of the molding machine, and has a sprue part Hs at the center thereof which communicates with a nozzle hole (not shown) of the injection head. Instead of integrally forming the sprue part Hs with the resin supply mold part 13 as described above, a sprue bush having a sprue part is provided separately from the resin supply mold part, and this sprue bush is incorporated into the resin supply mold part. You can

The two fixed molds 11 and 12 and the resin supply mold portion 13 are housed in a cylindrical housing body 14 (mold housing) having one side (the mold mating surface side of the fixed molds 11 and 12) opened. The other side of the housing 14 (fixed molds 11 and 1
The rear vertical wall 14w for closing the rear side 2) is the fixed type mechanism 1
It is integrally fixed to the base plate 15 (fixed base plate) of 0. The resin supply mold part 13 has its base end fixed to the fixed base board 15 and its front end inserted through the rear vertical wall 14w of the mold housing 14 to form both fixed molds 11, 1.
Located between the two. The first and second fixed molds 11 and 12 and the resin supply mold portion 13 interposed therebetween constitute a fixed mold assembly 9 (fixed mold assembly) while being housed in the mold housing 14. ing.

To the upper and lower ends of the fixed base plate 15, the base ends of the vertical plates 16 and 16 which extend in the vertical direction and have substantially the same width as the fixed base plate 15 are fixed, and the terminal side of each vertical plate 16 is fixed. The base ends of the horizontal plates 17 that project and extend in the front direction (the mold closing direction) are fixed to these. Further, the frame base 51 of the intermediate mold mechanism 50 is located in front of each end of the pair of upper and lower horizontal plates 17. The pair of upper and lower frame bases 51 are formed in the shape of a rod having a quadrangular vertical cross section, and are supported by the pair of left and right rod members 53 so as to be slidable forward and backward, respectively, in front of the upper and lower horizontal plates 17. That is, the intermediate mold mechanism 50 is supported by the fixed mold mechanism 10 and is located between the fixed mold mechanism 10 and the movable mold mechanism 30. The intermediate mold mechanism 50 may be supported independently from both the fixed mold mechanism 10 and the movable mold mechanism 30.

As can be seen from FIGS. 2 and 5, the upper and lower ends of a pair of guide rods 55 (intermediate type guide rods) are fixed near the left and right ends of the upper and lower frame bases 51. These guide rods 55, 55 are located in front of the mold housing 14 and are inserted in the vicinity of the ends of the intermediate mold 60 to extend in the vertical direction. L-shaped brackets 59 (cylinder brackets) are integrally fixed to the left and right sides of the intermediate die 60, and an intermediate die drive cylinder 57 for driving the intermediate die 60 is fixed to each cylinder bracket 59. . The tip end of the piston rod 57p of each of the intermediate type drive cylinders 57 is fixed to the projecting pieces 51a projecting from the left and right side surfaces of the lower frame base 51.

Then, the intermediate type drive cylinder 57 is driven to perform the expansion / contraction operation (that is, the piston rod 5 thereof).
7p moves forward / backward with respect to the cylinder body)
As a result, the intermediate die 60 becomes the cylinder bracket 5
It is configured to move up and down while being guided by the guide rods 55 and 55 via the guides 9 and 59. In the present embodiment, the intermediate drive cylinders 57, 57, the cylinder brackets 59, 59 and the intermediate guide rods 55, 55 are used.
Corresponds to the "mold moving means" described in the claims of the present application.

2 and 4, the upper and lower ends of a pair of guide rods 19 (adjustment plate guide rods) are fixed to the horizontal plate 17 of the fixed-side mold mechanism 10. These adjusting plate guide rods 19,
The reference numeral 19 extends vertically through the upper and lower openings of the mold housing 14 and the vicinity of the ends of the upper and lower mold thickness adjusting plates 21 and 22, respectively.

The intermediate mold 60 is replaced with the first and second fixed molds 1.
When the movable side die mechanism 30 is closed and fixed to the fixed side die mechanism 10 in a state of being positioned at the upper and lower positions corresponding to either 1 or 12, the intermediate die 60 is inserted as it is. The mold clamping thickness on the side (the lower side in the example of FIGS. 1 to 5) (that is, the thickness of the portion where the mold clamping force is to be applied between the fixed mold back surface and the movable mold back surface) is the intermediate mold. It becomes thicker than the mold clamping thickness on the side not interposing 60 (the upper side in the example of FIGS. 1 to 5). The mold thickness adjusting plates 21 and 22
Is for adjusting the difference in mold clamping thickness between the upper side and the lower side due to the interposition of the intermediate mold 60, and is set to the same thickness as the upper and lower base parts (described later) of the intermediate mold 60. There is.

The mold thickness adjusting plates 21 and 22 are slidable up and down along the rear vertical wall 14w of the mold housing 14 by being guided by the adjusting plate guide rods 19 and 19. The plate 21 is the first wall 14w and the first
Between the rear surface of the fixed mold 11 and the second mold thickness adjusting plate 22.
Can be moved back and forth between the vertical wall 14w and the back surface of the second fixed mold 12. That is, the left and right side surfaces of the upper horizontal plate 17 and the first and second mold thickness adjusting plates 21 and 22 have a pair of protrusions 17a and 21a, respectively.
a and 22a are provided in a protruding manner, and an adjusting plate driving cylinder 23 for driving the mold thickness adjusting plates 21 and 22 is fixed to each protruding piece 17a of the upper horizontal plate 17 (see FIGS. 2 and 2). (See FIG. 4).

The tip end of the piston rod 23p of each adjusting plate drive cylinder 23 is fixed to a protrusion 22a fixed to the side surface of the lower second die thickness adjusting plate 22, and the middle portion of the piston rod 23p. And the upper first mold thickness adjusting plate 21
The projecting piece 21a projecting from the side surface of the is coupled. Then, the adjusting plate drive cylinder 23 is driven to expand and contract (the piston rod 23p moves forward / backward relative to the cylinder body).
By performing the retreat operation), the first mold thickness adjusting plate 21 and the second mold thickness adjusting plate 22 are moved up and down.

The adjusting plate drive cylinder 23 and the intermediate mold drive cylinder 57 are both connected to a controller (not shown) provided in a control panel (not shown) attached to the molding apparatus 1 so that signals can be exchanged. , Its operation is controlled by a command signal from the controller. And
Between the rear surface of the fixed mold on the opposite side of the first and second fixed molds 11 and 12 to be combined with the intermediate mold 60 and the vertical wall 14w of the mold housing 14, the first and second mold thicknesses are provided. Both drive cylinders 23 and 57 are controlled so that either of the adjusting plates 21 and 22 is positioned.

More specifically, when the intermediate die 60 is combined with the first fixed die 11, the second die thickness adjusting plate 22 causes the vertical wall 14w of the die housing 14 and the second fixed die 12 to be specifically described. Located between the back and the back of the
The mold thickness adjusting plate 21 is combined with the second fixed mold 12 located above the mold housing 14, and when the intermediate mold 60 is combined with the second fixed mold 12, the first mold
The mold thickness adjusting plate 21 and the vertical wall 14w of the mold housing 14 and the first
The adjusting plate driving cylinder is arranged so as to be positioned between the fixed mold 11 and the back surface (at this time, the second mold thickness adjusting plate 22 is located below the mold housing 14) and to be combined with the first fixed mold 11. 23 and the intermediate-type drive cylinder 57 are controlled.

On the other hand, the movable die mechanism 30 has first and second mold opening directions which are the same and are arranged in parallel (in this embodiment, the mold opening directions are horizontal and vertically parallel). The two movable molds 31 and 32 are provided. On the mold matching surfaces of the movable molds 31 and 32, the female mold parts F1R and F2R of the first and second fixed molds 11 and 12 are formed.
Are provided with concave female molding portions F1L and F2L that are positioned so as to face each other.

Further, between the movable molds 31 and 32 (that is, at a position facing the resin supply mold portion 13), both are kept at a predetermined interval and a mold portion 33 (having a resin passage (runner)) is provided. The runner type part) is located. First, second
Movable dies 31, 32 and the runner die 3 located between them
3 is an integral structure and forms a movable die assembly 29 (movable die assembly). In the present embodiment, the combination of the fixed mold and the movable mold is constant, the combination of the first fixed mold 11 and the first movable mold 31, and the second fixed mold 12 and the second movable mold 32.
This combination corresponds to the "first and second two sets of molding dies" described in the claims of the present application.

As can be seen clearly from FIG. 3, on the mold matching surface of the runner mold part 33, there are concave resin receiving parts JH corresponding to the sprue parts Hs of the resin supply mold part 13, and from the resin receiving parts JH. Groove-shaped first and second runners J1 and J2 are formed to reach the female molding portions F1L and F2L of the movable dies 31 and 32, respectively. The first and second movable dies 31 and 32 and the runner die 33 may be configured as an integral body as in the present embodiment, or may be formed separately. When the molds are separated, the molds 31, 32 and 33 can be easily manufactured. The configuration can be further simplified.

The first and second movable molds 31 and 32 and the runner mold part 33 are cylindrical case bodies 34 that are open on both front and rear sides.
The mold case 34 is housed in a (mold case), and the mold case 34 has its rear surface side fixed to a quadrilateral frame body 35 (base frame). The back side of the base frame 35 is fixed to a mounting base board 36 that is connected to a drive device (not shown) that drives the entire movable side mold mechanism 30 to open and close horizontally with respect to the fixed side mold mechanism 10.

The drive unit (not shown) is, for example, of a hydraulic type and is connected to a controller (not shown) provided on a control panel (not shown) of the molding apparatus 1 so that signals can be exchanged. The operation signal is controlled by the command signal. Then, according to a control signal from the controller (not shown), the movable side mold mechanism 30 can be opened and closed while maintaining the parallel state with the fixed side mold mechanism 10 at a predetermined timing. Since the driving device for driving the entire movable side mold mechanism 30 to open and close is the same as that well known in the related art, illustration and detailed description of its structure are omitted.

The base ends of the vertical plates 37 of substantially the same width extending in the vertical direction are fixed to the upper and lower sides of the base frame 35, respectively, and the front end of each vertical plate 37 (the movable side mechanism 30) is fixed. The rod-shaped mount bars 39 are respectively located in the mold closing direction with respect to the fixed-side mold mechanism 10. As can be seen from FIG. 3, the pair of upper and lower mount bars 39 are formed in the shape of a rod having a quadrangular vertical cross section, and are provided near the ends of the mount bars 39 so as to project near the ends of the vertical plates 37. Left and right pair of pin members 3
8 (guide pin) is slidable forward and backward.
That is, each mount bar 39 has the left and right guide pins 3
The front and rear vertical plates 37 are supported by 8 so as to be slidable forward and backward, respectively.

Between the rear surfaces of the first and second movable dies 31, 32 and the runner die 33 and the mounting base board 36,
The main components of the ejector device 70 of the movable side mold mechanism 30 are arranged. That is, as shown in detail in FIG. 6, the main ejector plate Bm, the fixed plate 72, the slide plate 73, and the first, second, and third ejectors arranged in the vertical direction in order from the side closer to the mounting base board 36. Board 74 (74A,
74B, 74C), and these ejector plates 74 (74
A, 74B, 74C), and first, second, and third guide plates 75 (75A, 75B, 75C) vertically arranged.
Is provided.

The fixing plate 72 is fixed to the front surface of the base frame 35 on the rear end side of the mold case 34, and the main ejector plate Bm is formed between the fixing plate 72 and the mounting base plate 36. The first, the second, and the first, the second, which are arranged in the space so as to be movable in the front-rear direction (the opening / closing direction of the movable-side mold mechanism 30 with respect to the fixed-side mold mechanism 10) and which extend forward through the fixed plate 72 are inserted. Third pin member Pt (Pt
A, PtB, PtC (protruding pins) are vertically arranged in three rows so as to project. More preferably, a plurality of the first, second, and third protruding pins Pt (PtA, PtB, PtC) are provided in the left-right direction.
On the other hand, the front end side of the piston rod (both not shown) of the ejector drive cylinder which is the main drive source of the ejector device 70 is coupled to the back side of the main ejector plate Bm via the drive shaft Sd.

In the space formed between the front surface of the fixed plate 72 and the back surfaces of the first and second movable molds 31, 32 and the runner mold portion 33, there is a slide plate 73 which slides vertically. , The first, second, and third ejector pins Pe (Pe
(A, PeB, PeC) which respectively support the rear end side,
Second and third ejector plates 74 (74A, 74B, 74
C) and the first, second and third ejector pins Pe (P
eA, PeB, PeC) first, second, and third guide plates 75 (75A, 75B, 75) for guiding the axial movement of
C) are arranged so as to be movable in the front-rear direction. The movement of these constituent elements in the front-back direction is controlled by the protruding state of the protruding pin Pt (PtA, PtB, PtC) from the fixed plate 72 and the slide position of the slide plate 73 in the vertical direction.

The above-mentioned first, second and third ejector pins Pe
A, 78B and 78C are inserted into the first, second and third guide plates 75A, 75B and 75C, respectively, and then the first movable die 3
The first and second movable molds 32 and the runner mold part 33 are inserted from the back side and arranged so that they can project and retract from the surfaces of the corresponding female mold parts F1L and F2L and the resin receiving part JH. The first, second, and third ejector pins PeA, Pe
B and PeC are arranged in three rows in the vertical direction,
More preferably, a plurality of lines are provided in each of the left and right directions. Behind the first, second and third ejector plates 74A, 74B and 74C, the first, second and third projecting pins PtA, PtB and Pt are located at corresponding positions.
C is located, and the slide plate 73 has the ejector plate 74 and the tips of these protruding pins Pt (PtA, PtB, PtC) (that is, the front surface of the fixed plate 72 when the main ejector plate Bm is in the retracted position). (74A, 74B, 74
It slides up and down between the rear surface of C).

A drive mechanism for causing the slide plate 73 to slide vertically will be described. The ejector plate 74 (74A, 74B, 74C), the guide plate 7
5 (75A, 75B, 75C), protruding pin Pt (PtA,
PtB, PtC) and ejector pin Pe (PeA, Pe)
(B, PeC), the uppercase alphabetic characters A, B and C added to the end indicate the first movable die 31, the second
The first corresponding to the movable die 32 and the runner die 33, respectively.
(A), 2 (B), and 3 (C), respectively. However, in the following description, if it is not necessary to distinguish these three parts, the description will be simplified. For this reason, the alphabetical symbols A, B and C are appropriately displayed without being added at the end.

As is clear from FIG. 3, the upper and lower ends of a pair of guide rods 81 (slide plate guide rods) are fixed near the ends of the mount bar 39. These slide plate guide rods 81, 81
Respectively extend through the upper and lower openings of the die case 34 and the vicinity of the left and right end portions of the slide plate 73 and extend in the vertical direction. The slide plate 73 is guided by the slide plate guide rods 81, 81 to fix the fixed plate 7
2 and the ejector plate 74 (74A, 74B, 74C) can be slid up and down, and when in the upper position the first
And on the back side of the third ejector plates 74A and 74C,
Further, when it is in the lower position, it is located on the back side of the second and third ejector plates 74B and 74C, respectively.

A pair of left and right slide plate drive cylinders 82 for vertically sliding the slide plate 73 are fixed to the upper mount bar 39, and a piston rod 82p of each slide plate drive cylinder 82 is fixed.
Is inserted into the upper opening of the mold case 34, and its tip is fixed to the upper end side of the slide plate 73. Then, the slide plate drive cylinder 82 is driven to perform expansion / contraction operation (its piston rod 82p moves forward / backward with respect to the cylinder body), whereby the slide plate 7 is moved.
3 is slid up and down.

The slide plate drive cylinder 82, the ejector drive cylinder (not shown) described above, and the movable side mold mechanism 3
The entire drive device (not shown) of 0 is connected to a controller (not shown) provided in the above-mentioned control panel (not shown) attached to the molding apparatus 1 so that signals can be transmitted and received. The operation signal is controlled by the command signal.

As shown in FIGS. 1 and 6, in the ejector device 70, the main ejector plate Bm is forward (the mold closing direction of the movable side mold mechanism 30) with the slide plate 73 set in the upper position. When driven to, the upper and middle two types of projecting pins PtA and PtC project forward, and these projecting pins PtA and PtC push the slide plate 73 forward. As a result, the upper and middle ejector plates 74A and 74C are pushed forward, and the ejector pins PeA and PeC supported by these ejector plates 74A and 74C are projected. That is, the ejector pin PeA has the first movable die 3
The ejector pin PeC protrudes from the surface of the first female molding portion F1L, and the ejector pin PeC protrudes from the surface of the resin receiving portion JH of the runner mold portion 33.

On the other hand, when the slide plate 73 is set to the lower position, the main ejector plate B is reversed, contrary to the above case.
When m is moved forward, two types of lower and middle protruding pins PtB and PtC are projected forward, and these protruding pins PtB and PtC push the slide plate 73 forward. As a result, the lower and middle ejector plates 74B and 74C are pushed forward, and the lower and middle ejector pins PeB and PeC supported by these ejector plates 74B and 74C are respectively projected. That is, the ejector pin PeB is projected from the surface of the female mold part F2L of the second movable mold 32, and the ejector pin PeC is projected from the surface of the resin receiving part JH of the runner mold part 33. Although not specifically shown, the ejector device 70 has a return mechanism including a return spring, a return pin, etc. for returning the ejected ejector plate 74 and ejector pin Pe to their original positions. Is provided.

Next, the structure and operation of the intermediate die 60 will be described. As shown in detail in FIG. 7, the intermediate mold 60 is
Female mold parts F1R, F2 of the first and second fixed molds 11, 12
Fixed side male mold part to be combined with either R
And the female molding parts F1L of the first and second movable molds 31, 32,
It is provided with a movable-side male molding portion МL that is combined with any of F2L. Also, these male mold parts МR, М
As will be described later, in the vicinity of L, annular projections МRg and МLg are provided to form an annular groove in the outer peripheral edge of the abutting surface of the half-divided body of the molded product. Both male mold parts МR, МL and annular protrusions МRg, МLg
Are provided back-to-back with each other at a substantially central portion in the vertical direction of the intermediate die 60.

Further, the bases 60 above and below the annular protrusions МRg, МLg of the male molding parts МR, МL.
One set (2 pieces) that penetrates the intermediate die 60 for U and 60L
Resin passages Ks and Kn are provided respectively. Of these resin passages, the outer one (horizontal resin passage Ks) penetrates the intermediate die 60 in a substantially horizontal direction, and the inner one (oblique resin passage Kn) penetrates the intermediate die 60 in an oblique direction.
The thicknesses of the first and second mold thickness adjusting plates 21 and 22 are the same as the upper and lower base parts 60U and 6 of the intermediate mold 60, respectively.
It is set equal to the thickness of 0L.

FIG. 10 shows a hollow body W made of synthetic resin (hereinafter, appropriately referred to as a work or a molded product) according to the present embodiment. As shown in FIG. 11, the work W has a pair of half-split bodies (left half-split body Wb and right half-split body Wa).
Are formed in a hollow shape by combining the two halves, as will be described later, a single molding device 1 is used to mold the left and right halves Wb, Wa and abut / join both halves Wb, Wa. As a result, a hollow body having a substantially elliptic cylindrical shape as a whole is obtained.

As can be seen from FIG. 11, an annular groove Wg is formed on the outer peripheral edge of the abutting surface of each half body Wa, Wb.
1 and Wg2 are provided. By abutting both Wa and Wb, a half-divided body W is formed along the outer periphery of the abutting surface.
A groove portion Wg having a U-shaped cross section formed by the wall portions of a and Wb is formed. At the time of molding, the groove portion Wg has an opening closed by the mold surface of the molding die to form a resin passage having a closed cross-section (bonding resin passage). Thus, the half-divided body W is formed in the molding die.
By abutting the a and Wb against each other and filling the joining resin passage with the molten resin, the two halves Wa and Wb are joined together.

Then, as shown in FIG. 8, with the intermediate die 60 positioned at the lower side (second position), the movable side die mechanism 30 is provided.
Is closed to the fixed side mold mechanism 10 and the mold is clamped, the intermediate mold 60 is sandwiched between the second fixed mold 12 and the second movable mold 32. At this time, the piston rod 23p of the adjusting plate drive cylinder 23 is in the forwardly extended position, and the first die thickness adjusting plate 21 on the upper side is in the first fixed die 11
Between the rear surface of the mold housing and the rear vertical wall 14w of the mold housing 14. As described above, the thicknesses of the mold thickness adjusting plates 21 and 22 are set to be equal to the thicknesses of the upper and lower base portions 60U and 60L of the intermediate mold 60. By positioning the mold thickness adjusting plate 21 or 22, the mold clamping thickness can be made equal on the upper side and the lower side.

By the above mold clamping, the left and right halves Wb and Wa are held in abutting state by the female mold F1R of the first fixed mold 11 and the female mold F1L of the first movable mold 31. The first cavity S1 to be obtained is formed, and the right side half-divided body Wa is molded by the female molding part F2R of the second fixed mold 12 and the fixed side (right side) male molding part МR of the intermediate mold 60. (Right) The second cavity S2a has a female molding portion F2L of the second movable mold 32 and a movable side (left side) male molding portion of the intermediate mold 60.
The second movable side (left side) for forming the right half-divided body Wb with L
The cavities S2b are respectively formed.

Further, in this case, the upper horizontal resin passage Ks communicates the sprue portion Hs of the resin supply mold portion 13 and the resin receiving portion JH of the runner die portion 33, and the upper diagonal resin passage Kn is the runner type. The second resin passage J2 of the portion 33 communicates with the fixed side (right side) second cavity S2a. Then, the molten resin injected from the injection head (not shown) of the molding machine passes from the sprue portion Hs through the upper horizontal resin passage Ks of the intermediate die 60 and the resin receiving portion J of the runner die portion 33.
Supplied to H. The molten resin supplied by injection is supplied from the resin receiving portion JH of the runner die portion 33 to the first cavity S1 via the first runner J1 and is also movable via the second runner J2 of the runner die portion 33. It is supplied to the side (left side) second cavity S2b, and is further supplied to the fixed side (right side) second cavity S2a through the second runner J2 and the oblique resin passage Kn on the upper side of the intermediate mold 60 in order.

As a result, in the first cavity S1, the groove Wg along the outer circumference of the abutting portion of the left and right halves Wb, Wa.
The molten resin is filled in the resin passage (the joining resin passage) in which the opening is closed by the mold surface of the molding die, so that the two half halves Wb and Wa are joined together to form a hollow molded product. W is obtained. Also, the movable side (left side) second cavity S
The left half Wb is formed by 2b, and the fixed side (right side) second
The right half half Wa is molded in the cavity S2a.

On the other hand, as shown in FIG. 9, when the movable side mold mechanism 30 is closed and clamped with respect to the fixed side mold mechanism 10 with the intermediate mold 60 positioned above (first position). The intermediate mold 60 is sandwiched between the first fixed mold 11 and the first movable mold 31. At this time, the piston rod 23p of the adjusting plate drive cylinder 23 is at a position retracted upward, and the second mold thickness adjusting plate 22 on the lower side is provided between the rear surface of the second fixed mold 12 and the rear vertical wall 14w of the mold housing 14. Located in between.

By the above-mentioned mold clamping, the left and right half halves Wb, Wa are held in an abutting state by the female mold F2R of the second fixed mold 12 and the female mold F2L of the second movable mold 32. A second cavity S2 to be obtained is formed, and a fixed side for molding the right half-divided body Wa by the female molding section F1R of the first fixed mold 11 and the fixed side (right side) male molding section МR of the intermediate mold 60. (Right side) The first cavity S1a includes the female molding portion F1L of the first movable mold 31 and the movable side (left side) male molding portion of the intermediate mold 60.
The movable side (left side) for forming the right half-divided body Wb with L
The cavities S1b are respectively formed.

Further, in this case, the lower horizontal resin passage Ks connects the sprue portion Hs of the resin supply mold portion 13 and the resin receiving portion JH of the runner mold portion 33, and the lower diagonal resin passage Kn is formed. The first runner J1 of the runner die portion 33 and the fixed side (right side) first cavity S1a are communicated with each other. Then, the molten resin injected from the sprue portion Hs is supplied to the resin receiving portion JH of the runner die portion 33 through the horizontal resin passage Ks below the intermediate die 60. The molten resin supplied by injection is supplied from the resin receiving portion JH of the runner die portion 33 to the second cavity S2 via the second runner J2, and is also movable via the first runner J1 of the runner die portion 33. It is supplied to the side (left side) first cavity S1b, and is further supplied to the fixed side (right side) first cavity S1a through the first runner J1 and the lower diagonal resin passage Kn in sequence.

As a result, in the second cavity S1, the groove portion Wg along the outer circumference of the abutting portion of the left and right halves Wb, Wa.
The molten resin is filled in the resin passage (the joining resin passage) in which the opening is closed by the mold surface of the molding die, so that the two half halves Wb and Wa are joined together to form a hollow molded product. W is obtained. In addition, the movable side (left side) first cavity S
The left half-divided body Wb is formed by 1b, and the fixed side (right side)
The right half half Wa is formed in the cavity S1a.

Next, the molding apparatus 1 configured as described above.
The molding process of the hollow body work W performed by using will be described. First, as an initial state, as shown in FIG. 1, the left and right male molding parts МL and 61 of the intermediate mold 60 are
However, the female mold part F2L of the second movable mold 32 and the second fixed mold 1
The lower position (second part) located between the second female molding part F2R
In the state (position), the movable mold mechanism 30 is closed to the fixed mold mechanism 10 to perform mold clamping (mold clamping step). At this time, the first mold thickness adjusting plate 21 moves the first fixed mold 11
The operation of the adjusting plate drive cylinder 23 is controlled so as to be located on the back side of the.

As a result, the first cavity S1 is formed by the female molding portion F1R of the first fixed mold 11 and the female molding portion F1L of the first movable mold 31, and the male molding portion МR of the intermediate mold 60 is formed.
And the second cavities S2a and S on the right and left sides of МL.
2b are respectively formed (see FIG. 8). At this time,
The left and right halves Wb, Wa formed in the previous cycle are held in the first cavity S1 in an abutting state (see FIG. 12). At the start of production, in the case of the first production cycle, since there is no molded product of the previous cycle, a dummy having the same shape as the one obtained by abutting the left and right half halves Wb, Wa is used. , And is set in the first cavity S1.

At this time, as shown in FIGS. 1 and 6, the slide plate 73 of the ejector device 70 is located at the upper position (the position corresponding to the back surface of the first and third ejector plates 74A and 74C). Thus, the operation of the slide plate drive cylinder 82 is controlled. Therefore, in this state, when the main ejector plate Bm is driven forward, the first ejector pin PeA corresponding to the female molding portion F1L of the first movable die 31 and the resin receiving portion JH of the runner die portion 33. Therefore, the third ejector pin PeC corresponding to is moved forward.

In the mold clamping state (see FIG. 12), the molten resin is injected into the sprue bush 13 from the injection head (not shown) of the molding machine (injection step). The injected molten resin is supplied from the sprue part Hs of the resin supply mold part 13 to the resin receiving part JH of the runner mold part 33 via the upper horizontal resin passage Ks of the intermediate mold 60, and from there, the first runner is supplied. To the first cavity S1 via J1, and on the movable side (left side) second cavity S2b via the second runner J2.
In addition, the second runner J2 and the intermediate mold 60 are sequentially supplied to the fixed side (right side) second cavity S2a through the upper diagonal resin passage Kn.

As a result, as shown in FIG. 13, in the first cavity S1, the groove Wg along the outer circumference of the abutting portion of the left and right halves Wb, Wa closes the opening with the die surface of the forming die. By filling the molten resin into the resin passage (bonding resin passage) thus formed, the two halves Wb and Wa are joined together to obtain a hollow molded product W. Further, the left half body Wb in the movable side (left side) second cavity S2b, the right half body Wa in the fixed side (right side) second cavity S2a,
Each is molded.

When the above injection step is completed, the movable side die mechanism 30 is driven to open the die as shown in FIG. 14 (die opening step). At this time, the work W molded in the first cavity S1 has the resin paths (the upper horizontal resin path Ks and the upper oblique resin path K of the intermediate mold 60) at the time of injection filling.
n, and the resin receiving portion JH of the runner die portion 33 and the first,
A movable mold (first movable mold 3) together with a surplus resin part (so-called “deep” part) Wd corresponding to the second runners J1, J2).
1) side is held.

Then, the ejector device 70 is driven to move the main ejector plate Bm forward, and the first ejector pin PeA corresponding to the female molding portion F1L of the first movable die 31 is moved.
Also, the third ejector pin PeC corresponding to the resin receiving portion JH of the runner die portion 33 is projected. As a result, the molded product W in which the above-mentioned thick portion Wd is still connected is released from the female mold forming portion F1L of the first movable mold 31 and taken out from the mold (product taking-out step). After that, the above-mentioned flesh portion Wd is cut and removed from the molded product W taken out, and the final outer shape of the molded product W is obtained.

Next, the intermediate die drive cylinder 57 is operated to move the intermediate die 60 upward so that the left and right male die forming portions МL and МR of the intermediate die 60 are moved to the female die forming portion F1L of the first movable die 31. And the female molding portion F1R of the first fixed mold 11 are set at an upper position (second position) (intermediate mold moving step). The intermediate mold moving step corresponds to the "mold moving step" described in the claims of the present application. Then, in the position setting state of the intermediate mold 60, the movable side mold mechanism 30 is closed to the fixed side mold mechanism 10 to perform mold clamping (mold clamping step). At this time, the second die thickness adjusting plate 22 moves the second fixed die 1
Adjustment plate drive cylinder 23 so that it is located on the back side of
Is controlled.

As a result, the second cavity S2 is formed by the female mold F2R of the second fixed mold 12 and the female mold F2L of the second movable mold 32, and the male mold MR of the intermediate mold 60 is formed.
And the first cavities S1a and S on the right and left sides of the ML.
1b are formed respectively (see FIG. 9). At this time,
In the second cavity S2, the left and right half halves Wb, Wa formed in the injection process described above are held in an abutting state (see FIG. 15).

At this time, the slide plate 73 of the ejector device 70 is at the lower position (the second and third ejector plates 7 and 7).
The operation of the slide plate drive cylinder 82 is controlled so that the slide plate drive cylinder 82 is located at a position corresponding to the back surface of 4B and 74C.
That is, when the main ejector plate Bm is driven forward, the second ejector pin PeB corresponding to the female molding portion F2L of the second movable die 32 and the resin receiving portion JH of the runner die portion 33 corresponding to the second ejector pin PeB. 3 The ejector pin PeC will move forward.

In this mold clamping state (see FIG. 13), molten resin is injected into the resin supply mold section 13 from the injection head (not shown) of the molding machine (injection step). As a result, in the second cavity S2, the resin passage (joining resin passage) in which the groove portion Wg along the outer circumference of the abutting portion of the left and right halves Wb and Wa has the opening closed by the die surface of the forming die 2) is filled with molten resin, the two half-divided bodies Wa and Wb are joined to each other to obtain a hollow molded product W. Further, the left half-divided body Wb in the movable side (left side) first cavity S1 and the right half-divided body Wa in the fixed side (right side) first cavity S1a,
Each will be molded.

As described above, according to the present embodiment, the mold clamping process, the injection process, the mold opening process, the product take-out process, and the intermediate mold moving process described above are repeated in this order to move the mold. Every time the side mold mechanism 30 performs one opening / closing operation with respect to the fixed side mold mechanism 10, the pair of half-divided bodies Wa and Wb are joined to each other to obtain a hollow molded product W. That is, when manufacturing a synthetic resin hollow body W in which a pair of half-divided bodies Wa and Wb are joined together, a finished product W is formed for each opening / closing operation of the two sets of molding dies 11, 31 and 12, 32. Since (hollow body) is obtained, a very high production efficiency can be secured.

In this case, one set of molding dies 11,3
The intermediate mold 60 is located between 1 or 12 and 32, and a pair of half-divided bodies Wa and Wb are molded by the combination of these molds, and the molds 12, 32 or 11, 31 of another set are molded in the previous cycle. Since the molten resin is injected into the abutting part between the halves Wa and Wb to join the two Wa and Wb together, compared to the DRI method and the double DSI method, the pressure receiving part of the mold where the injection pressure acts during injection molding. The maximum value of the projected area in the mold clamping direction (and therefore the maximum value of the required mold clamping force) can be significantly reduced, and the size of the molding machine to be applied can be reduced. That is, it is possible to suppress the increase in size of the molding apparatus while maintaining high production efficiency by obtaining the finished product W each time the mold is opened.

Particularly, since the intermediate mold 60 is provided with a pair of male molding parts МR and МL arranged back to back,
Since the pair of male mold parts МR, МL are located between the female mold parts F1R, F1L or F2R, F2L of either the first or second mold 11, 31, or 12, 32, One set of half body W in series on both sides of the intermediate mold 60
It is possible to mold a and Wb. That is, it is possible to minimize the projected area in the mold clamping direction of the pressure receiving portion of the mold on which the injection pressure acts during injection molding, and it is possible to further reduce the required mold clamping force.

Further, in this embodiment, the moving means for moving the intermediate die 60 relative to the forming dies 11, 31 and 12, 32 is the first and second forming dies 11, 3 described above.
In the direction (vertical direction) orthogonal to the opening / closing direction of 1 and 12, 32, the intermediate mold 60 and the molding dies 11, 31, and 12,
Since 32 is slid relative to each other, this sliding operation causes the intermediate mold 60 and the molding dies 11, 31 and 12 for each opening / closing operation of the first and second molding dies 11, 31 and 12, 32. It is possible to surely perform relative movement with respect to the first and second parts. As a result, the above-mentioned forming dies 11, 3
The molding of the pair of half-divided bodies Wa, Wb and the joining of the half-divided bodies Wa, Wb can be reliably performed without any trouble for each opening / closing operation of 1 and 12, 32. still,
The first and second molding dies 11, 31 and 12, 32
When the intermediate die 60 and the forming dies 11, 31 and 12, 32 are slid relative to each other in the direction (vertical direction) orthogonal to the opening and closing direction of the two, as in the first embodiment, Only the intermediate mold 60 may be slid while the 11, 31, and 12, 32 are stationary, and conversely, the molding dies 11, 31, 12, and 32 may be moved with the intermediate mold 60 stationary. You may slide it. Alternatively, both the intermediate mold 60 and the molding dies 11, 31 and 12, 32 may be appropriately slid.

In the first embodiment, the intermediate die 60 is moved in the direction perpendicular to the opening / closing direction of the movable die mechanism 30 with respect to the fixed die mechanism 10 by moving the intermediate die 60 and the forming die (fixed die 11, 12 and the movable dies 31, 32) are slid relative to each other, but instead, the intermediate dies and the forming dies are relatively rotated to form the intermediate dies and the forming dies. It is also possible to change the relative positional relationship of the molds.

Next, a second embodiment of the present invention will be described with reference to FIGS. This second
In the above embodiment, the intermediate die is moved by rotating the intermediate die by 180 degrees between the fixed-side die mechanism and the movable-side die mechanism. In the following description, components having the same basic structure as those in the first embodiment and having similar functions are designated by the same reference numerals, and further description will be omitted.

FIG. 16 is a vertical cross-sectional explanatory view schematically showing the structure of the molding apparatus according to the second embodiment in the mold open state, and FIG. 17 shows the mold after rotating the intermediate mold from the mold open state of FIG. FIG. 18 is a vertical cross-sectional explanatory view of the molding apparatus showing a clamped state, FIG. 18 is a vertical cross-sectional explanatory view of the molding apparatus showing a mold opened state after injection molding from the mold clamped state of FIG.
FIG. 19 is an explanatory view schematically showing the fixed-side mold mechanism and the intermediate mold mechanism of the molding apparatus, which is an arrow view seen from the direction of the arrow Y19-Y19 in FIG.

As shown in these figures, the molding apparatus 1
In the fixed-side die mechanism 110 of 01, as shown in FIG. 19, the assembly 109 (fixed die assembly) of the first fixed die 111, the resin supply die section 113 and the second fixed die 112 as a whole is viewed from the front. It is configured to have a circular shape, and the sprue portion Hs of the resin supply mold portion 113 is located at the center of the circular shape. Resin supply mold part 113 according to the second embodiment
Then, the sprue bush 113 which is a separate body from the mold portion 113
S is provided, and this sprue bush 113S has an inner cylinder (hot tip) 113 having a sprue portion Hs at its tip.
A and an outer cylinder (bush body) 113B that is rotatable and slidable in the axial direction with respect to A are provided.
It is bound to 0U.

The above-mentioned first fixed mold 111 and resin supply mold section 11
Housing body 114 (mold housing) for holding the assembly 109 (fixed mold assembly) of the third and second fixed molds 112
Is a cylindrical portion 114A having an inner peripheral portion slidably fitted to the outer peripheral portion of the fixed mold assembly 109, and the cylindrical portion 114A.
A plate-shaped base portion 11 extending vertically on the back side of the
4B, and the base portion 114B and the first fixed mold 111.
The mold thickness adjusting plate 120 is arranged between the mold and the back surface of the mold. This mold thickness adjusting plate 120 is for adjusting the difference in mold clamping thickness between the upper side and the lower side due to the interposition of the intermediate mold 160, as in the first embodiment.
It is set to the same thickness as the base. However, in the present embodiment, only one die thickness adjusting plate 120 is provided and is fixedly held at this position (the back surface of the first fixed die 111).

Base portion 114 of the mold housing 114
The fixed platen 115 located on the rear surface of B has a mold housing 1
A motor 116 (housing drive motor) for rotationally driving 14 is fixed, and the base 114B of the mold housing 114 has the drive motor 11 when the housing rotates.
6 is formed with an arc-shaped groove 114j that allows the sliding and rotating movement relative to the main body of FIG. In addition, the fixed plate 115
The first and second stationary molds 111 and 112 are located on the rear side of the first and second rear cylinders 118 and 1.
19 are provided. In addition, the mold housing 114
The cylindrical portion 114A has a tooth portion 114g along its outer peripheral portion.
(Drive gear) is formed, and the driven gear 114g meshes with a gear 117 (housing drive gear) which is rotationally driven by the housing drive motor 116.

Further, a rod member 152 (horizontal rod) extending in the horizontal direction is provided at one end portion (lower end portion in FIGS. 16 and 19) of the base portion 114B of the mold housing 114 so as to project therefrom. A rod member 15 extending in the up-down direction via a block body 154 is provided at the tip.
6 (support rod) is connected to the lower end thereof, and the upper end of the support rod 156 is connected to the outer base 160 of the intermediate mold 160.
L is jointly supported. Inner base 16 of the intermediate mold 160
As described above, 0U is coupled and supported by the tip portion of the outer cylinder 113B of the sprue bush 113S. Therefore, by operating the housing drive motor 116 to rotate the housing drive gear 117, the die housing 114 is rotated via the driven gear 114g meshing with the housing drive gear 117, and the intermediate die 160 is sprued. It rotates around the axis of the bush outer cylinder 113B.

The intermediate die 160, the horizontal rod 152 for supporting the intermediate die 160, the block body 154, and the support rod 1
56 and 56 form an intermediate mold mechanism 150. Also,
In the second embodiment, the housing drive motor 116, the housing drive gear 117, the driven gear 114g,
Mold housing 114, horizontal rod 152, block body 1
54 and the support rod 156 constitute the "mold moving means" described in the claims of the present application.

The intermediate mold 160 has a structure similar to that of the intermediate mold 60 in the first embodiment, but unlike the case in the first embodiment, one base (outer base 160L) is used. Is not provided with a horizontal resin passage, and only the other base portion (inner base portion 160U) supported by the sprue bush outer cylinder 113B has a horizontal resin passage Ks.
Is provided. And, more preferably, the center line of the horizontal resin passage Ks is the sprue bush outer cylinder 113B.
The intermediate mold 160 rotates around the center line of the horizontal resin passage Ks together with the sprue bush outer cylinder 113B. Therefore, the molten resin from the injection head (not shown) of the molding machine can be removed from the sprue bush 1.
It is supplied through the sprue part Hs of 13S and always through this horizontal resin passage Ks.

On the other hand, in the movable side die mechanism 130, although not specifically shown, the first movable die 131 and the runner die portion 1
33 and the second movable die 132 are configured so as to have a circular shape as a whole in a front view similarly to the fixed die assembly 109, and the resin receiving portion JH of the runner die portion 133 is provided at the center of the circular shape.
Is located. The first movable die 131, the runner die 1
Case body 134 for holding 33 and the second movable die 132
The basic shape of the (mold case) is cylindrical. The first and second movable molds 131 and 132 and the runner mold part 133 located between them form a movable mold assembly 129 (movable mold assembly) as an integral structure, as in the case of the first embodiment. is doing. Also in this embodiment, the combination of the fixed mold and the movable mold is constant, and the combination of the first fixed mold 111 and the first movable mold 131 and the combination of the second fixed mold 112 and the second movable mold 132 are the same. It corresponds to the "first and second sets of molding dies" described in the claims.

In the ejector device 170 of the movable side mold mechanism 130, the fixed plate 172 and the ejector plate 174 are used.
And a rotary plate 173 rotatable around the horizontal center axis of the ejector device 170, and an opening 134j is formed in the upper part of the case body 134 (mold case) of the movable side mold mechanism 130. Has been formed. Further, a motor 137 (rotating plate driving motor) for rotationally driving the rotating plate 173 is fixed to a mounting base plate 136 located on the back side of the mold case 134.

A tooth portion 173g (driven gear) is formed along the outer peripheral portion of the rotary plate 173, and the driven gear 173g is driven by the gear 138 (rotary plate drive) rotatably driven by the rotary plate drive motor 137. Gear).
The rotary plate drive motor 137 and the rotary plate drive gear 13
Both 8 are located in the opening 134j of the mold case 134. In addition, the rotary plate 173 has three
Of the ejector plates 74, the opening 1 having a size corresponding to the upper and lower ejector plates 174 set to the same size.
73H is provided, and the opening 173H is the rotary plate 1
Depending on the rotational position of 73, it is located on the back side of either one of the upper and lower ejector plates 174.

With respect to the ejector plate 174 having the opening 173H on the back side, the ejector device 170 is actuated to project the drive shaft Sd, and the main ejector plate Bm and the projecting pin Pt move forward accordingly. Even if it does, it is not advanced through the rotary plate 173, and therefore the ejector pin Pe is not projected. That is, the ejector plate 174 corresponding to the substantial part of the rotary plate 173 (the part other than the opening 173H).
Only the ejector pin Pe corresponding to the ejector pin Pe is projected.

Next, the molding apparatus 1 configured as described above.
The molding process of the hollow body work W performed by using No. 01 will be described. For example, the steps from the mold opening state of FIG. 16 will be described in order. In the mold open state shown in FIG. 16, the molding work W obtained in the injection step of the previous cycle is in the female molding part F1L of the first movable mold 131, and the left half-divided body Wb is in the female of the second movable mold 132. Also, the right half-divided body Wa is formed in the mold forming part F2L and the female mold forming part F of the second fixed mold 112 is formed.
2R, respectively. The forming work W
As in the case of the first embodiment, each of the resin paths (horizontal resin passage Ks and inner diagonal resin passage Kn of the intermediate die 160, the resin receiving portion JH of the runner die portion 133 and the first resin passage Ks of the intermediate die 160) is used. Then, it is held on the side of the movable die (first movable die 131) together with the surplus resin portion (so-called “thickness” portion) Wd corresponding to the second runners J1, J2).

In this mold open state, the intermediate mold 160
Left and right male molding parts МL and М provided back to back
R is at a lower position (second position) located between the female molding portion F2L of the second movable mold 132 and the female molding portion F2R of the second fixed mold 112. Further, the rotating plate 173 of the ejector device 170 has an opening 173H located on the back side of the lower ejector plate 174. Therefore, when the ejector device 170 is driven, only the upper and central ejector plates 174 are advanced, and only the upper and central ejector pins Pe are projected.

In this mold open state, the product take-out step is performed. That is, the ejector device 170 is driven to advance the upper and central ejector plates 174, and the upper and central ejector pins Pe are projected. As a result, the molded product W in which the above-mentioned thick portion Wd is still connected is released from the female mold molding portion F1L of the first movable mold 131 and taken out of the mold 131. After that, the above-mentioned flesh portion Wd1 is cut and removed from the molded product W taken out, and the final outer shape of the molded product W is obtained.

Next, by operating the housing drive motor 116, the die housing 114 is rotationally driven via the gear mechanisms 117 and 114g. As a result, the intermediate mold 1 is centered around the axis of the sprue bush outer cylinder 113B.
When 60 is rotated 180 degrees, the left and right male mold forming parts МL and МR of the intermediate mold 160 become the female mold forming parts F of the first movable mold 131.
It is set at an upper position (first position) located between 1L and the female molding portion F1R of the first fixed mold 111 (mold moving step). Further, by operating the rotary plate drive motor 137, the rotary plate 17 is driven via the gear mechanisms 138 and 173g.
3 is rotationally driven. As a result, the rotary plate 173 is moved to 180
Then, the opening 173H of the rotary plate 173 is positioned on the back side of the upper ejector plate 174 by rotating the rotary plate 173 by one degree.

In this state, the movable side die mechanism 130 is closed to the fixed side die mechanism 110 to perform die clamping (die clamping step). As a result, as shown in FIG. 17, the female mold F2R of the second fixed mold 112 and the second movable mold 132 are formed.
The second cavity S2 is formed with the female mold part F2L of the intermediate mold 160, and the first cavities S1a and S1b are formed on the right and left sides of the male mold parts МR and МL of the intermediate mold 160, respectively. In the two cavities S2, the left and right halves Wb, which were molded in the injection process of the previous cycle,
Wa is held in an abutting state. Note that, as in the case of the first embodiment, a dummy having the same shape as the one obtained by abutting the left and right halves Wb and Wa at the start of production is used.

With the above mold clamping state (see FIG. 17), the sprue bush 113 is moved from the injection head (not shown) of the molding machine.
Molten resin is injected into S (injection step). The injected molten resin passes from the sprue portion Hs of the sprue bush 113S through the horizontal resin passage Ks of the intermediate mold 160,
It is supplied to the resin receiving portion JH of the runner mold portion 133, and from there, to the second cavity S2 via the second runner J2 and to the movable side (left side) first cavity S1b via the first runner J1. , The first runner J1 and the intermediate mold 1
It is supplied to the fixed side (right side) first cavity S1a through the diagonal resin passages Kn inside 60 in sequence. As a result, in the second cavity S2, the left and right halves W
b and Wa are joined together to obtain a hollow molded product W. In addition, in the movable side (left side) first cavity S1b, the left side half body Wb is fixed side (right side) first cavity S1.
At a, the right half-divided bodies Wa are respectively molded.

When the above injection step is completed, the movable side die mechanism 30 is driven to open the die as shown in FIG. 18 (die opening step). At this time, the work W molded in the second cavity S2 is held on the movable die (second movable die 32) side together with the surplus resin portion (so-called “thickness” portion) Wd1. Then, the ejector device 170 is driven to move the lower ejector pin Pe corresponding to the female molding portion F2L of the second movable die 132 and the central ejector pin Pe corresponding to the resin receiving portion JH of the runner die portion 133. Make it stick out. As a result, the molded product W in which the above-mentioned thick portion Wd is still connected is released from the female mold forming portion F2L of the second movable mold 132 and taken out from the mold 132 (product taking-out step). After that, the above-mentioned flesh portion Wd is cut and removed from the molded product W taken out, and the final outer shape of the molded product W is obtained.

As described above, the mold clamping process, the injection process, the mold opening process, the product removing process, and the intermediate mold moving process described above are repeatedly performed in this order, so that the fixed mold of the movable mold mechanism 130 is Each time the mechanism 110 is opened and closed, the pair of half-divided bodies Wa and Wb are joined to each other to obtain a hollow molded product W. That is, as in the case of the first embodiment, the finished product W is obtained every time the mold is opened.
By maintaining the high production efficiency, it is possible to prevent the molding apparatus from increasing in size.

In particular, in this embodiment, the die moving means for moving the intermediate die 160 relative to the forming dies 111, 131 and 112, 132 is the first and second forming dies 11, 31. The intermediate mold 160 and the molding dies 111, 131, and 11 are arranged along a plane orthogonal to the opening / closing direction of the dies 12, 12, 32.
Since the first and second molding dies 111, 131, and 112, 132 are opened and closed relative to each other, the intermediate dies 160 are rotated relative to each other.
The relative movement between the molds 111, 131 and 112, 132 can be reliably performed. As a result, a pair of half-divided bodies Wa and Wb are molded and the half-divided body W is formed for each opening / closing operation of the molding dies 111, 131 and 112, 132.
The joining of a and Wb can be reliably performed without any trouble.

In particular, in the present embodiment, the intermediate mold 1
60 to drive the molds 111, 131 and 112, 132
With respect to the movement of the die itself, a drive mechanism may be provided only in the intermediate die 160, as compared with the case where both the molding dies 111, 131 and 112, 132 are moved. Is less.

Further, in particular, in this embodiment, since only one mold thickness adjusting plate 120 has a fixed positional relationship with the fixed mold assembly 109, the case of the first embodiment is different. As described above, it is not necessary to provide the two mold thickness adjusting plates and provide a driving mechanism therefor, and the structure of the fixed mold mechanism 110 can be simplified.

Next, a third embodiment of the present invention will be described. In the third embodiment, the fixed die and the movable die are rotated by 180 degrees while the intermediate die is kept stationary between the fixed-side die mechanism and the movable-side die mechanism. The relative movement of the. FIG. 20 is an explanatory longitudinal sectional view schematically showing the structure of the molding apparatus according to the third embodiment in the mold open state, and FIG.
FIG. 1 is an explanatory longitudinal sectional view of the molding apparatus showing a state in which a fixed mold and a movable mold are taken out from the mold opened state of FIG. 20 and FIG. 22 is clamped from the mold rotating state of FIG. FIG. 23 is a vertical cross-sectional explanatory view of the molding apparatus showing a state, and FIG. 23 is an explanatory view schematically showing a fixed side mold mechanism and an intermediate mold mechanism of the molding apparatus, which are viewed from the direction of arrows Y23-Y23 in FIG. FIG.

As shown in these figures, the molding device 2
In the fixed side die mechanism 210 of 01, as shown in FIG. 23, the assembly 2 of the first fixed die 211 and the second fixed die 212
09 (fixed die assembly) is configured to have a circular shape as a whole when viewed from the front, and the sprue portion Hs is provided at the center of the circular shape.
The sprue bushing 213S having is located. Housing body 214 holding the fixed mold assembly 209
The (mold housing) is a side wall part 214A having an inner peripheral part slidably fitted to the outer peripheral part of the fixed mold assembly 209, and a plate-shaped base part 214B located on the back side of the fixed mold assembly 209. And a mold thickness adjusting plate 220 is arranged between the base portion 214B and the back surface of the first fixed mold 211. This mold thickness adjusting plate 220 is for adjusting the difference in mold clamping thickness between the upper side and the lower side due to the interposition of the intermediate mold 260, as in the case of the first embodiment. The thickness is set to be equal to that of the base portions 260U and 260L. However, in the present embodiment, the mold thickness adjusting plate 2
Only one sheet 20 is provided and is fixedly held at this position (the back surface of the first fixed die 211).

Base portion 214 of the mold housing 214
A motor 218 (fixed type drive motor) for rotationally driving the fixed type assembly 209 is fixed to B. Further, the fixed mold assembly 209 is formed with a tooth portion 209g (driven gear) along the outer periphery thereof, and the driven gear 209g is driven by the fixed drive motor 218 to rotate the gear 219 (fixed type). Drive gear). Therefore, by operating the fixed-type drive motor 218 to rotate the fixed-type drive gear 219, the fixed-type assembly 209 is rotated via the driven gear 209g meshing with the fixed-type drive gear 219.

Base portion 214 of the mold housing 214
A fixed base plate 215 is located on the back surface of B, and the base end portion of the sprue bush 213S is fixed to the fixed base plate 215, and the tip side thereof is the mold housing 2 described above.
Both fixed molds 211, 2 are inserted through the base portion 214B of 14
Located between twelve. The upper and lower ends of the fixed base board 215 have the same shapes as in the first embodiment.
The base ends of the vertical plates 216, 216 that extend in the vertical direction and have substantially the same width as the fixed base board 215 are fixed, and the horizontal side of the vertical plates 216 that extends toward the front (the mold closing direction) protrudes toward the end side. The base end portions of 217 are fixed.

Further, the pair of upper and lower horizontal plates 217
The frame base 251 of the intermediate-type mechanism 250 is located in front of each of the terminals. The pair of upper and lower frame bases 251 are formed in a rod shape having a quadrangular vertical cross section, and are supported by a pair of left and right rod members 253 so as to be slidable forward and backward in front of the upper and lower horizontal plates 217. That is, the intermediate mechanism 25
0 is supported by the fixed side mold mechanism 210 and is located between the fixed side mold mechanism 210 and the movable side mold mechanism 230.

As can be seen from FIG. 23, the upper and lower ends of the pair of tie rods 255 are fixed near the left and right ends of the upper and lower frame bases 251. These tie rods 255, 255 are located in front of the mold housing 214 and are inserted in the vicinity of the ends of the intermediate mold 260 to extend in the vertical direction. The intermediate mold 260 has the left and right male mold parts МL and МR arranged back to back as shown in FIG.
At 0, the second movable mold 232 and the second mold F2L
Second located between the fixed mold 212 and the female molding portion F2R
The upper and lower positions are set to the position (downward position in FIG. 20), and the tie rods 255 and 255 are fixed to the middle portions thereof.

The intermediate die 260 has a structure similar to that of the intermediate die 60 in the first embodiment, but the first die
Unlike the case of the above embodiment, it does not move in the vertical direction. As the fixed mold assembly 209 rotates, the fixed molds 211 and 212 and the intermediate mold 260 move relative to each other. Therefore, the horizontal resin passage Ks is also provided only on one side (upper base portion 260U) of the upper and lower base portions 260U and 260L of the intermediate mold 260. Then, the molten resin from the injection head (not shown) of the molding machine is supplied through the sprue portion Hs of the sprue bush 213S and the horizontal resin passage Ks.

On the other hand, in the movable side die mechanism 230, although not specifically shown, the first movable die 231 and the runner die section 2 are provided.
An assembly 229 (movable die assembly) of the second movable die 232 and the second movable die 232 is configured to have a circular shape in a front view as a whole like the fixed die assembly 209. The resin receiving portion JH of 233 is located. The first and second movable molds 131 and 132 and the runner mold part 133 located between them have the same integrated structure as in the first embodiment. In addition, the movable mold assembly 229
The case body 234 (mold case) for holding is provided with an inner peripheral portion slidably fitted to the outer peripheral portion of the movable mold assembly 229.

The movable die assembly 2 is provided in the die case 234.
A motor 238 (movable drive motor) for rotating 29 is fixed. In addition, the movable mold assembly 22
A tooth portion 229g (driven gear) is formed along the outer peripheral portion of the gear 9, and the driven gear 229g meshes with a gear 239 (movable drive gear) which is rotationally driven by the movable drive motor 238. . Therefore, by operating the movable mold drive motor 238 to rotate the movable mold drive gear 239, the movable mold assembly 229, all ejector pins Pe, all guide plates 275 and all ejectors are driven via the driven gear 229g meshing with the movable mold drive gear 239. The plate 274 will be rotated integrally.

In the third embodiment, the fixed type drive motor 218, the fixed type drive gear 219, and the fixed type assembly 2 are used.
09 driven gear 209g and movable drive motor 238,
The movable mold drive gear 239 and the driven gear 229g of the movable mold assembly 229 constitute the “mold moving means” described in the claims of the present application. In this embodiment, the fixed mold assembly 20 is used.
9 and the movable mold assembly 229 rotate together, but the combination of the fixed mold and the movable mold itself is still constant, and the first fixed mold 111
And the first movable die 131 and the second fixed die 112
The combination of the second movable mold 132 and the second movable mold 132 corresponds to the “first and second sets of molding dies” described in the claims of the present application.

In the ejector device 270 of the movable side mechanism 230, the fixed plate 272 and the ejector plate 274 are used.
Between and, an intermediate plate 273 having a size corresponding to the back surfaces of the first movable die 231 and the runner die portion 233 in FIG. 20 is provided. The intermediate plate 273 is
The ejector plate 274 is fixedly provided on the fixed plate 272, and the ejector plate 274 is fixed to the intermediate plate 273 as shown in FIG.
In a plane perpendicular to the plane of the paper in FIG.

Of the three upper, middle, and lower ejector plates 274, the ejector device 270 is used for the ejector plate 274 whose intermediate plate 273 is not located on the back side.
Is actuated to eject the drive shaft Sd, and even if the main ejector plate Bm and the projecting pin Pt move forward accordingly, the ejector plate 274 does not move forward, and therefore the ejector pin Pe projects. Never be done. That is, only the ejector plate 174 corresponding to the intermediate plate 273 is moved forward, and only the ejector pin Pe corresponding to this is projected.

Next, the molding apparatus 2 configured as described above.
The molding process of the hollow body work W performed by using No. 01 will be described. For example, the steps from the mold opening state of FIG. 20 will be described in order. In the mold open state shown in FIG. 20, the molding work W obtained in the injection step of the previous cycle is in the female molding part F1L of the first movable mold 231 and the left half-divided body Wb is in the female of the second movable mold 232. The right half-divided body Wa is formed in the mold forming part F2L and the female mold forming part F of the second fixed mold 212 is formed.
2R, respectively.

In this mold open state, the intermediate mold 260
The left and right male molding parts МL and МR are the second movable mold 232.
Female molding portion F2L and female molding portion F of the second fixed mold 212
It is located between 2R (the second position). Further, the intermediate plate 273 of the ejector device 270 has the first movable mold 2
31 and the ejector plate 27 corresponding to the runner mold portion 233
4 (upper and central ejector plates in FIG. 20). Therefore, the ejector device 270
20 is driven, only the upper and central ejector plates 274 in FIG. 20 are advanced, and only the upper and central ejector pins Pe corresponding to these are ejected.

In this mold open state, the product take-out step is performed. That is, the ejector device 270 is driven and the ejector plates 27 on the upper side and the center in FIG.
4 are advanced, and only the corresponding upper and middle ejector pins Pe are projected. As a result, the molded product W in which the above-mentioned flesh portion Wd is still connected is
The first movable die 231 is released from the female molding portion F1L and taken out of the die 231. After that, the above-mentioned flesh portion Wd is cut and removed from the molded product W taken out, and the molded product W
The final external shape of is obtained.

Next, the fixed die drive motor 218 is operated to rotationally drive the fixed die assembly 209 via the gear mechanisms 219 and 209g. As a result, the fixed mold assembly 20 is centered on the axis of the sprue bush 213S.
9 is rotated 180 degrees relative to the intermediate mold 260. On the other hand, by operating the movable drive motor 238, the movable assembly 229 is rotationally driven via the gear mechanisms 239 and 229g. This causes the movable mold assembly 229 to rotate 180 degrees relative to the intermediate mold 260.

As a result, as shown in FIG. 21, the intermediate mold 2
The left and right 60 male molding parts МL and МR are the first movable mold 2
It is located between the female molding portion F1L of 31 and the female molding portion F1R of the first fixed mold 211 (first position) (mold moving step). Further, as the movable mold assembly 229 rotates, the ejector plate 274, the guide plate 275, and the ejector pin Pe also rotate 180 degrees, and the intermediate plate 27
3 is the lower and central ejector plates 2 in FIG.
It comes to be located on the back side of 74.

In this state, the movable side die mechanism 230 is closed to the fixed side die mechanism 210 to perform die clamping (die clamping step). As a result, as shown in FIG. 22, the female molding portion F2R of the second fixed mold 212 and the second movable mold 232.
The second cavity S2 is formed with the female mold portion F2L, and the movable side first cavity S1a and the fixed side first cavity S1b are formed on the right and left sides of the male mold portions МR and МL of the intermediate die 260, respectively. However, at this time, the left and right halves Wb, Wa formed in the injection process of the previous cycle are held in the second cavity S2 in an abutting state. At the start of production, the left and right halves W
As in the case of the first embodiment, a dummy having the same shape as the one obtained by abutting b and Wa is used.

With the above mold clamping state (see FIG. 22), the sprue bushing 213 is moved from the injection head (not shown) of the molding machine.
Molten resin is injected into S (injection step). The injected molten resin passes from the sprue portion Hs of the sprue bushing 213S through the horizontal resin passage Ks of the intermediate die 260.
It is supplied to the resin receiving portion JH of the runner mold portion 233, and from there, to the second cavity S2 via the first runner J1 and to the movable side (left side) first cavity S1b via the second runner J2. , The second runner J2 and the intermediate mold 2
It is supplied to the fixed side (right side) first cavity S1a through the diagonal resin passages Kn inside 60 in sequence.

As a result, in the second cavity S2, the left and right halves Wb, Wa are joined together to obtain a hollow molded product W. Further, the left half body Wb is molded in the movable side (left side) first cavity S1b, and the right half body Wa is molded in the fixed side (right side) first cavity S1a. In the case of the present embodiment, the finished product W is always molded on the same upper and lower sides (always on the upper side in the examples of FIGS. 20 to 23).

When the above injection step is completed, the movable side die mechanism 230 is driven to open the die (die opening step). At this time, the work W molded in the second cavity S2 is held on the movable die (second movable die 232) side together with the surplus resin portion (so-called “thickness” portion) Wd. Then, the ejector device 270 is driven to eject the ejector pin P corresponding to the female molding portion F2L of the second movable die 232.
e and the ejector pin Pe corresponding to the resin receiving portion JH of the runner mold portion 233 are projected. As a result, the molded product W in which the above-mentioned thick portion Wd is still connected is released from the female mold molding portion F2L of the second movable mold 232 and taken out from the mold 232 (product taking-out step). After that, the above-mentioned flesh portion Wd is cut and removed from the molded product W taken out, and the final outer shape of the molded product W is obtained.

As described above, by repeatedly performing the mold clamping process, the injection process, the mold opening process, the product take-out process, and the intermediate mold moving process, in this order, the fixed mold of the movable mold mechanism 230 is fixed. Each time the mechanism 210 is opened and closed, the pair of half-divided bodies Wa and Wb are joined together to obtain a hollow molded product W. That is, as in the case of the first and second embodiments, it is possible to maintain the high production efficiency by obtaining the finished product W at each mold opening and to suppress the enlargement of the molding apparatus. You can do it.

In particular, in this embodiment, the moving means for moving the intermediate die 160 relative to the forming dies 111, 131 and 112, 132 is the first and second forming dies 11, 31 and Along the plane orthogonal to the opening / closing direction of 12, 32, the intermediate mold 160 and the molding dies 111, 131 and 112,
Since the first and second molding dies 111, 131, and 1 are moved relative to each other by this rotation operation.
The relative movement of the intermediate die 160 and the forming dies 111, 131 and 112, 132 for each opening / closing operation of 12, 132 can be reliably performed. As a result, the pair of half-divided bodies Wa, Wb are formed and the half-divided bodies Wa, W are formed for each opening / closing operation of the molding dies 111, 131 and 112, 132.
It is possible to surely perform the joining with each other without any hindrance.

Further, in particular, in this embodiment, the molding dies 211, 231 and 212, 232 are driven to drive the intermediate mold 2.
Since the intermediate die 260 and its supporting mechanism are stationary, relative die movement can be performed because the intermediate die 260 is rotationally moved with respect to 60. The mold drive mechanism can be made compact.

Further, in particular, in this embodiment, since only one mold thickness adjusting plate 220 has a fixed positional relationship with the fixed mold assembly 209, the mold thickness adjusting plate 220 in the case of the first embodiment is not fixed. As described above, it is not necessary to provide two mold thickness adjusting plates and to provide a driving mechanism therefor, and the structure of the fixed mold mechanism 210 can be simplified. Further, in the present embodiment, the finished product W is always on the same side on the upper and lower sides (always on the upper side in the examples of FIGS. 20 to 23).
Since it is molded by, it is possible to simplify the operation and configuration of the product take-out device when taking out the molded product W.

Further, in this embodiment, the intermediate plate 273 for switching the ejector pin Pe to be ejected is fixed to the fixing plate 272 of the ejector mechanism 270, and the movable mold assembly 229 is rotated. The ejector plate 274, the guide plate 275, and the ejector pin Pe are rotated by 180 degrees,
Since the positional relationship with 3 is switched, the intermediate plate 2
A dedicated mechanism for driving 73 is unnecessary, and the structure of the ejector mechanism 270 can be simplified.

The present invention is not limited to the above-mentioned embodiments, and within the scope of the gist of the invention,
It goes without saying that various improvements and design changes are possible.

[0124]

According to the manufacturing methods of the first and second inventions of the present application, when manufacturing a hollow body made of synthetic resin in which a pair of half-split bodies are joined together, one set of two molding dies is used. Since a finished product (hollow body) is obtained for each opening / closing operation, extremely high production efficiency can be secured. In this case, an intermediate mold is positioned between one set of molds to form a pair of half halves by a combination of these molds, and the half halves formed in the previous cycle by the molds of the other set are impacted. Since the molten resin is injected into the joint to join the two, the maximum value of the projected area in the mold clamping direction of the pressure receiving part of the mold on which the injection pressure acts at the time of injection molding is (compared to the DRI method and the double DSI method. Therefore, the maximum value of the required mold clamping force can be significantly reduced, and the size of the molding machine to be applied can be reduced. That is, it is possible to suppress the increase in the size of the molding apparatus while maintaining high production efficiency by obtaining a finished product each time the mold is opened. Particularly, in the case of the manufacturing method according to the first invention,
Since the intermediate mold includes a pair of male mold parts arranged back to back, the pair of male mold parts is located between the female mold parts of either the first mold or the second mold. By doing so, one set of half-divided bodies can be formed in series on both sides of the intermediate mold. That is, it is possible to minimize the projected area in the mold clamping direction of the pressure receiving portion of the mold on which the injection pressure acts during injection molding, and it is possible to further reduce the required mold clamping force.

Further, according to the manufacturing apparatus of the third and fourth inventions of the present application, when manufacturing a synthetic resin hollow body in which a pair of half halves are joined together, one of two sets of molding dies is used.
Since a finished product (hollow body) is obtained for each opening / closing operation, extremely high production efficiency can be secured. In this case, 1
An intermediate mold is placed between the molds of a set to form a pair of halves by the combination of these molds, and molten resin is applied to the abutting part of the halves molded in the previous cycle by the mold of another set. Since they are injected and joined together, compared to the DRI method and the double DSI method, the maximum value of the projected area in the mold clamping direction of the pressure receiving part of the mold on which the injection pressure acts during injection molding (therefore, the required mold clamping force The maximum value of) can be significantly reduced,
The size of the molding machine to be applied can be small. That is, it is possible to suppress the increase in the size of the molding apparatus while maintaining high production efficiency by obtaining a finished product each time the mold is opened. Particularly, in the case of the manufacturing apparatus according to the third aspect of the invention, since the intermediate mold includes a pair of male mold forming portions arranged back to back, the pair of male mold forming portions is either the first or the second. By being located between the female molding portions of one of the molding dies, one set of half halves can be molded in series on both sides of the intermediate mold. That is, it is possible to minimize the projected area in the mold clamping direction of the pressure receiving portion of the mold on which the injection pressure acts during injection molding, and it is possible to further reduce the required mold clamping force.

Further, according to the fifth invention of the present application, basically, the same effect as that of the third or fourth invention can be obtained. In particular, the mold moving means includes the first and second
Since the intermediate mold and the molding die are slid relative to each other in the direction orthogonal to the opening / closing direction of both molding dies, the sliding operation causes the intermediate movement for each opening / closing operation of the first and second molding dies. The relative movement of the die and the forming die can be surely performed. As a result, one of both molds
For each opening / closing operation, the molding of the pair of half-divided bodies and the joining of the half-divided bodies can be reliably performed without any trouble.

Furthermore, according to the sixth invention of the present application, basically, the same effect as that of the third or fourth invention can be obtained. In particular, since the mold moving means relatively rotates the intermediate mold and the molding die along the planes orthogonal to the opening / closing directions of the first and second molding dies, the rotation operation causes It is possible to reliably perform relative movement between the intermediate die and the forming die for each opening / closing operation of the first and second forming dies. As a result, the molding of the pair of half-divided bodies and the joining of the half-divided bodies can be reliably performed without any trouble for each opening / closing operation of the two molding dies.

Furthermore, according to the seventh invention of the present application, basically, the same effect as that of the sixth invention can be obtained. In particular, since the mold moving means drives the intermediate mold to rotationally move it with respect to the molding die, in order to move the mold itself, a drive mechanism may be provided only in the intermediate mold. Compared with, it requires less drive mechanism of the mold.

Further, according to the eighth invention of the present application, basically, the same effect as that of the sixth invention can be obtained. In particular, since the molding die is driven and rotationally moved with respect to the intermediate die, relative die movement can be performed while the intermediate die and its support mechanism remain stationary. The drive mechanism of the mold can be made compact as compared with the case where the mold is rotated.

Furthermore, according to the ninth invention of the present application, basically, the same effect as that of any one of the above fourth to eighth inventions can be obtained. In particular, since the intermediate mold has a pair of male mold parts arranged back to back,
By arranging the pair of male mold parts between the female mold parts of either the first mold or the second mold, a pair of half halves are molded in series on both sides of the intermediate mold. You can That is, it is possible to minimize the projected area in the mold clamping direction of the pressure receiving portion of the mold on which the injection pressure acts during injection molding, and it is possible to further reduce the required mold clamping force.

[Brief description of drawings]

FIG. 1 is an explanatory longitudinal sectional view schematically showing the structure of a molding apparatus according to a first embodiment of the present invention in a mold open state.

FIG. 2 is a perspective view schematically showing the structures of a fixed-side mold mechanism and an intermediate mold mechanism of the molding apparatus.

FIG. 3 is a perspective view schematically showing a structure of a movable side mold mechanism of the molding apparatus.

FIG. 4 is an explanatory view schematically showing a fixed-side mold mechanism of the molding apparatus, and is a view taken in the direction of arrows Y4-Y4 in FIG.

5 is an explanatory view schematically showing a fixed-side mold mechanism and an intermediate mold mechanism of the molding apparatus, and is a view taken in the direction of arrows Y5-Y5 in FIG.

FIG. 6 is an explanatory longitudinal cross-sectional view showing an enlarged main part of an ejector device attached to the molding device.

FIG. 7 is an explanatory longitudinal sectional view showing an intermediate mold of the molding apparatus in an enlarged manner.

FIG. 8 is a vertical cross-sectional explanatory view showing an enlarged mold clamping state when the intermediate mold is at the lower position.

FIG. 9 is a vertical cross-sectional explanatory view showing an enlarged mold clamping state when the intermediate mold is at the upper position.

FIG. 10 is a vertical cross-sectional explanatory view of a molded product according to the first embodiment.

FIG. 11 is an explanatory longitudinal cross-sectional view of a pair of half halves constituting the molded product.

FIG. 12 is an enlarged vertical cross-sectional explanatory view for explaining a mold clamping step in the molding process according to the first embodiment.

FIG. 13 is an enlarged vertical cross-sectional explanatory view for explaining an injection step in the molding process according to the first embodiment.

FIG. 14 is an enlarged vertical cross-sectional explanatory view for explaining a mold opening step and a product taking-out step in the molding process according to the first embodiment.

FIG. 15 is an enlarged vertical cross-sectional explanatory view showing the mold clamping state after the mold moving step in the molding process according to the first embodiment.

FIG. 16 is an explanatory longitudinal sectional view schematically showing the structure of the molding apparatus according to the second embodiment of the present invention in the mold open state.

17 is a vertical cross-sectional explanatory view of the molding apparatus according to the second embodiment, showing a state where the intermediate mold is rotated and then the mold is clamped from the mold open state of FIG. 16.

FIG. 18 is an explanatory longitudinal sectional view of the molding apparatus according to the second embodiment, showing a state where the mold is opened after injection molding from the mold clamped state of FIG. 17;

FIG. 19 is an explanatory view schematically showing the fixed-side mold mechanism and the intermediate mold mechanism of the molding apparatus according to the second embodiment,
FIG. 17 is a view seen from the direction of the arrows Y19-Y19 in FIG.

FIG. 20 is an explanatory longitudinal sectional view schematically showing the structure of the molding apparatus according to the third embodiment of the present invention in the mold open state.

21 is a vertical cross-sectional explanatory view of the molding apparatus according to the third embodiment, showing a state in which the fixed mold and the movable mold are rotated from the mold open state of FIG. 20. FIG.

22 is an explanatory longitudinal sectional view of the molding apparatus according to the third embodiment, showing a state where the movable mold is clamped to the fixed mold from the mold opened state of FIG. 21.

FIG. 23 is an explanatory view schematically showing a fixed side mold mechanism and an intermediate mold mechanism of the molding apparatus according to the third embodiment,
It is the arrow line view shown from the Y23-Y23 arrow direction of FIG.

[Explanation of symbols]

1, 101, 201 ... Molding apparatus 10, 110, 210 ... Fixed side mold mechanism 11, 111, 211 ... First fixed mold 12, 112, 212 ... Second fixed mold 30, 130, 230 ... Movable side mold mechanism 31, 131, 231 ... First movable die 32, 132, 232 ... Second movable die 50, 150, 250 ... Intermediate die mechanism 55 ... Intermediate die guide rod 57 ... Intermediate die drive cylinder 57p ... Intermediate die drive cylinder piston rod 59 ... Cylinder brackets 60, 160, 260 ... Intermediate molds F1L, F2L ... Movable female mold parts F1R, F2R ... Fixed female mold parts ML, MR ... Intermediate male mold parts S1, S2, S1a, S1b , S2a, S2b ... Molding cavity W ... Work (hollow body made of synthetic resin) Wa, Wb ... Half body

Claims (9)

(57) [Claims] 1. A manufacturing method for manufacturing a synthetic resin hollow body by abutting a pair of synthetic resin halves, and joining the two halves at the abutting portion, which are opposed to each other. A pair of male mold forming portions arranged back to back is provided between the female mold forming portions of one of the two forming molds each having a pair of molds including the female mold forming portion. A mold clamping step of closing both molds with the intermediate mold being positioned and holding the pair of half halves molded in the previous cycle in each female mold part of the other mold. And, after the mold clamping step, injecting molten resin into the cavity formed by each of the molding dies, and in one of the molding dies, a combination of a male molding part and a female molding part is used for the cycle. While molding a pair of half halves, In the case of (1), the injection step of injecting the molten resin into the abutting part of the half halves of the previous cycle by joining the female die forming parts and joining them together, and after the injection step, opening the both die A mold opening step, a product removing step of removing a hollow body formed by joining the half halves of the previous cycle from the other molding die after the mold opening step, and an intermediate die after the mold opening step The mold moving step of changing the relative position of the intermediate mold and the molding die so that the male molding portion of is positioned between the female molding portions of the other molding die, and A method for producing a hollow body made of synthetic resin, characterized in that a hollow body formed by joining a pair of half-divided bodies is obtained for each opening / closing operation. 2. A manufacturing method for manufacturing a synthetic resin hollow body by abutting a pair of synthetic resin halves, and joining the two halves at the abutting portion, which are opposed to each other. A pair of molds each having a female mold forming part, and an intermediate mold having a male mold part is positioned between the female mold parts of one of the two molds, and The mold thickness adjusting plate is located on the back of the mold, and the two molds are closed with the female mold parts of the other mold holding the pair of half halves molded in the previous cycle. And a mold clamping step of clamping the mold by a mold, and after the mold clamping step, a molten resin is injected into the cavity formed by each of the molds, and in one of the molds, a male mold part and a female mold part are formed. While molding a pair of half halves for the cycle in combination with In the other mold, an injection step of injecting a molten resin into the abutting part of the half halves of the previous cycle by joining the two parts by combining the female mold parts and joining the two, and after the injection process, A mold opening step of opening the mold, and a product removing step of removing a hollow body formed by joining the half halves of the previous cycle from the other molding die after the mold opening step, and the mold opening step After that, the relative position between the intermediate mold and the mold is such that the male mold part of the intermediate mold is located between the female mold parts of the other mold and the mold thickness adjusting plate is located on the back surface of the one mold. By repeating the step of changing the mold and the step of moving the mold, a hollow body in which a pair of half halves are joined together is obtained for each opening / closing operation of the above-mentioned molding dies. A method for producing a resin hollow body. 3. A manufacturing apparatus for manufacturing a synthetic resin hollow body by abutting a pair of synthetic resin halves, and joining the two halves at the abutting portion. And a pair of molds each having a pair of female mold forming parts, the first and second sets of molds having the same mold opening direction and arranged in parallel; A mold opening / closing means for opening and closing the second mold, and a pair of male mold parts arranged back to back combined with the female mold part are provided, and the male mold part is connected to the first mold part. An intermediate mold located between the female mold parts or between the female mold parts of the second mold, and for each one-time opening / closing operation of the first and second molds,
The male mold part is provided between the female mold parts of the first mold and the second mold part.
It is formed by closing the mold moving means for relatively moving the intermediate mold and the mold and the first and second molds so that they are alternately positioned between the female mold parts of the mold. An injection means for injecting a molten resin into each cavity tee, and a control means for controlling the operations of the injection means, the mold opening / closing means, and the mold moving means are provided, and the first and second molding dies are operated once. For each opening / closing operation of
A pair of male halves and female dies are used to mold a pair of halves for the cycle, and a combination of female halves is used to apply molten resin to the abutting parts of the halves of the previous cycle. Injection molding is performed to inject and join the two.
An apparatus for producing a hollow body made of synthetic resin, wherein a hollow body formed by joining a pair of half-divided bodies is obtained for each opening / closing operation of the above-mentioned molding dies. 4. A manufacturing apparatus for manufacturing a synthetic resin hollow body by abutting a pair of synthetic resin halves, and joining the two halves at the abutting portion, which are opposed to each other. And a pair of molds each having a pair of female mold forming parts, the first and second sets of molds having the same mold opening direction and arranged in parallel; A mold opening / closing means for opening / closing the second mold, and a male mold part to be combined with the female mold part are provided, and the male mold part is provided between the female mold parts of the first mold or the second mold part.
An intermediate die located between the female die forming parts of the forming die, and a die thickness adjusting plate located on the back surface of the other forming die in a state where the intermediate die is combined with one of the first and second forming dies. And for each opening / closing operation of the first and second molding dies,
The male mold part is provided between the female mold parts of the first mold and the second mold part.
It is formed by closing the mold moving means for relatively moving the intermediate mold and the mold and the first and second molds so that they are alternately positioned between the female mold parts of the mold. An injection means for injecting a molten resin into each cavity tee, and a control means for controlling the operations of the injection means, the mold opening / closing means, and the mold moving means are provided, and the first and second molding dies are operated once. For each opening / closing operation of
A pair of male halves and female dies are used to mold a pair of halves for the cycle, and a combination of female halves is used to apply molten resin to the abutting parts of the halves of the previous cycle. Injection molding is performed to inject and join the two.
An apparatus for producing a hollow body made of synthetic resin, wherein a hollow body formed by joining a pair of half-divided bodies is obtained for each opening / closing operation of the above-mentioned molding dies. 5. The mold moving device according to claim 3, wherein the mold moving means relatively slides the intermediate mold and the mold in a direction orthogonal to the opening and closing directions of the molds. Manufacturing equipment for synthetic resin hollow bodies. 6. The mold moving means relatively rotationally moves the intermediate mold and the mold along a plane orthogonal to the opening and closing directions of the molds.
The apparatus for manufacturing a synthetic resin hollow body according to 1. 7. The apparatus for manufacturing a synthetic resin hollow body according to claim 6, wherein the mold moving means drives the intermediate mold to rotationally move the intermediate mold. 8. The apparatus for manufacturing a synthetic resin hollow body according to claim 6, wherein the mold moving means drives the molding mold to rotate the mold relative to the intermediate mold. 9. The hollow body made of synthetic resin according to claim 4, wherein the intermediate mold includes a pair of male mold parts arranged back to back. Manufacturing equipment.