JPH03239511A - Method and device for mold release of expandable molded form - Google Patents

Abstract

PURPOSE:To recover an expandable molded form in an aligned state by holding the expandable molded form in a holding part by movement of an eject pin and carrying it to the outside from the interval of a forming mold together with a housing frame body and extruding the expandable molded form held in the holding part toward the other face of the housing frame body from one face thereof at the prescribed position. CONSTITUTION:An extrusion plate 29 is moved to an air cylinder 26 side apart from a housing frame body 30. This housing frame body 30 is moved to the lower part via a chain 19 by actuation of a motor 23. When the upper face of a pedestal 31 for a molded form is allowed to coincide with the rear surface of the holding part 30a in the upper side of the housing frame body 30, this movement to the lower part is stopped. Thereafter the air cylinder 26 is actuated and the extrusion plate 29 is moved to the direction of the pedestal 31 via a piston rod 27. This extrusion plate 29 extrudes the molded form 28 held in the holding part 30a on the pedestal 31. Thereby the molded forms 28 held in the holding part 30a of the upside and the downside are together placed on the pedestal 31 in an aligned state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mold release method and a mold release device for taking out foam molded products to the outside of a forming line in an aligned state.

[Conventional technology]

The base resin foam molding machine has a mold using a metal mold, and is configured to form a foam molded product (hereinafter referred to as a molded product) with this mold. Conventionally, the above molds have
An eject pin is provided, and this eject pin is
After molding is completed, the molded product is released from the opened mold. When collecting the released molded product, it is collected by dropping it into a bag placed below the mold, or by dropping it onto a conveyor etc. placed below and transporting it to the outside. It is now being transported to

However, if the molded product is dropped and recovered,
The molded products that were housed in the mold in an aligned state will be broken into pieces. Therefore, it is necessary for the operator to return the collected molded products to the aligned state by stacking them one by one, and then perform post-processes such as packaging them in units of a predetermined number. The return to
This placed an unnecessary burden on the workers. Furthermore, when collecting the molded product by dropping, there is a risk that when the molded product is released from the mold or dropped, it may come into contact with parts provided in the molding machine, such as tie bars, and become contaminated.

Therefore, for example, Japanese Patent Publication No. 59-21294 and Japanese Patent Application Laid-open No. 62-270323 have a suction part that can hold the molded product by vacuum suction, and this suction part is conveyed between opened molds. A method and apparatus for holding a molded article and then transporting it outside the molding machine and recovering it are disclosed. This makes it possible for the molding machine to collect the molded products in an aligned state, thereby eliminating the above-mentioned extra burden on the operator. Further, since the molded product released from the mold is conveyed while being held by the suction section, it is possible to prevent staining due to contact with components such as the tie bars mentioned above.

[Problem to be solved by the invention]

However, in the conventional method and apparatus described above, when sucking and holding a molded article from a mold, it is necessary to bring the suction part into contact with the molded article so that the suction can be performed reliably. Therefore,
In the above method and apparatus, after the mold is opened to the extent that the suction part can be transferred between the molds, the mold is moved toward the suction part, or the suction part is moved to the mold, and then the mold or suction part is moved to the mold. It becomes necessary to move the part to the position and direction before movement, and there is a problem that the number of steps increases. Furthermore, it is necessary to connect a suction means, such as a vacuum pump, to the suction section, and this suction means is a factor that increases the cost of the apparatus.

As described above, conventional equipment and methods make it possible to reduce the burden on workers and prevent staining of molded products, but they have the problem of increasing the number of steps and increasing the cost of the equipment. . Therefore, in the present invention, the release of foamed molded products can be constructed at a relatively low cost, and can reduce the burden on workers and prevent staining of molded products without increasing the number of steps. The object of the present invention is to provide a molding method and a mold release device.

[Means to solve the problem]

In order to solve the above-mentioned problem, a mold release method for a foam molded product according to claim 1 is provided by clamping a mold consisting of a movable mold such as a core mold and a fixed mold such as a cavity mold. The foamed molded product is produced by filling the cavity with foamable thermoplastic resin particles, heating and expanding them with a heating medium such as steam to obtain a foamed molded product, and then releasing the foamed molded product by moving an eject pin and recovering it. In the mold release method, after forming a foamed molded product in the cavity, a storage frame having a holding part that corresponds to the cavity and communicates with both sides facing the movable mold and the fixed mold is placed between the movable mold and the fixed mold. The foamed molded product is transported between the molds, and the foamed molded product is stored in the holding section by the movement of the eject pin, and the foamed molded product stored in the holding section is transported to the outside from between the molding molds consisting of a movable mold and a fixed mold, together with the storage frame. The foamed molded product accommodated in the holding portion is pushed out from one side of the storage frame toward the other side at a predetermined position.

In order to solve the above-mentioned problem, a mold release device for foam molded products according to claim 2 comprises a movable mold such as a core mold that forms a cavity portion by clamping the mold, and a fixed mold such as a cavity mold. A storage device that is provided on the fixed mold side of the mold and has an eject pin that releases the foam molded product formed in the cavity portion, and a holding portion that communicates with both surfaces facing the movable mold and the fixed mold, corresponding to the cavity portion. a frame body, a conveyance means such as a chain capable of conveying the storage frame body between a movable mold and a fixed mold, and a conveyance means such as a chain capable of conveying the storage frame body between the movable mold and the fixed mold to the outside; It is characterized by comprising extrusion means such as an air cylinder and an extrusion plate capable of extruding the foamed molded product housed in the holding portion from one side of the storage frame toward the other at a predetermined position.

[For production]

According to the structures of claims 1 and 2, the mold consisting of the movable mold and the fixed mold forms a foamed molded product in the cavity portion, and this foamed molded product is separated by an eject pin. It is designed to be typed. Further, a storage frame is provided between the movable mold and the fixed mold so as to be transportable, and this storage frame is provided with a holding portion corresponding to the cavity portion.

Therefore, when the storage frame is transported between the movable mold and the fixed mold, the foamed molded product formed in the cavity part is released from the mold by the eject pin, and this released foamed molded product is transferred to the storage frame. It is moved to the holding section and stored. As a result, the step of housing the foamed molded product in the holding portion is performed together with the release from the mold using the eject pin, and there is no need to add a new housing process. Furthermore, housing in the holding portion using the eject pin makes it unnecessary to provide a suction means such as a vacuum pump in the storage frame, making it possible to construct the device at low cost.

Moreover, since the foamed molded product is transported from between the molds together with the storage frame, contamination due to contact between the foamed molded product and parts of the device, etc., is prevented. Furthermore, the foamed molded product conveyed to the outside between the molds together with the storage frame is pushed out from one side of the storage frame toward the other side by an extrusion means at a predetermined position. Therefore, if, for example, a mounting table is installed on the extrusion side of the above-mentioned predetermined position, the foam molded products will be extruded in order onto this mounting table, and by collecting the foam molded products in an aligned state, it will be easier for the operator to It becomes possible to reduce the burden.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 9.

The mold release device according to this embodiment is installed in a foam molding machine, as shown in FIG. This foam molding machine has molded product 2.
A molding machine main body 1 forming 8... and a molding machine main body 1
The main body support part 2 is made up of a molding machine frame 3 assembled with, for example, an angle, and a cylinder 4 provided within the molding machine frame 3.

The above-mentioned cylinder 4 is provided horizontally at the center of the upper part of the main body support part 2, and the piston rod 5, which is the moving part of this cylinder 4, is connected to the molding machine main body 1 via a flange 6 provided at its tip. It is fixed to one side of the constituting moving plate 7. A plurality of tie bars 8 are slidably inserted through the ends of the movable plate 7, and one end of these tie bars 8 is connected to the molding machine frame 3.
At the same time, the other end is fixed to a fixed plate 9 disposed opposite to the movable plate 7. Thereby, the movable plate 7 can be moved to an arbitrary position by the piston rod 5 of the cylinder 4.

Further, a movable core mold 10 is provided on the other side of the movable plate 7, and this core mold 10 has the following features:
When the piston rod 5 is fully extended, it comes into contact with the fixed cavity mold 11, and the core mold 10 and the cavity mold 11 form a cavity portion having the same shape as the molded product 28... 12.12 is formed. Hollow parts 10a and 11a are formed inside the core mold 10 and cavity mold 11 that constitute the above mold, and these hollow parts 10a and 11a are connected to vacuum piping, steam piping, and It is connected to the drain pipe.

On the other hand, a large number of holes are formed in the surfaces of the core mold 10 and the cavity mold 11 that form the cavity parts 12, 12, and these holes are formed in the hollow parts 10a and 11a.
The cavity portions 12 are filled with steam or air as a heating medium, sucked in, and discharged through the respective pipes.

Further, the cavity mold 11 is provided with a filling device 13 connected to a hopper (not shown) corresponding to each cavity portion 12, 12, and this filling device 13 is connected to a hopper (not shown) or the like. The cavity portion 12 is filled with expandable thermoplastic resin particles such as expandable polystyrene as a raw material. Further, the cavity mold 11 is movably provided with eject pins 14 for extruding and releasing the molded products 28 from the cavity mold 11. They are disposed at two locations above and below the cavity portion 12 at the location.

Each of the above eject pins 14... has a spring 15.
Both ends of the spring 15 are fixed to the eject pins 14.

The spring 15 biases the eject pin 14 in the opposite direction when the eject pin 14 moves in the direction of the main body support part 2, and connects one end of the eject pin 14 with the surface of the cavity part 12 of the cavity mold 11. It is designed to be flush.

Further, an eject plate 16 that can come into contact with the other end of the eject pin 14 is provided adjacent to the eject plate 16, and the eject plate 16 is horizontally attached to both ends of the eject plate 16. One end of the eject rods 17 to be moved is fixed.

The above-mentioned eject rods 17, 17 are slidably installed through the fixed plate 9 and the moving plate 7 on the outer peripheral side of the tie bars 8, 8. And each of these eject rods 17.
First and second contact members 18a and 18b are fixed to 17 with the movable plate 7 in between. The first and second abutting members 18a and 18b are such that when the movable plate 7 moves in the direction of the fixed plate 9, the movable plate 7 and the first abutting member 18a come into contact with each other. When the movable plate 7 moves in the direction of the main body support section 2, the movable plate 7 and the second abutting member 18b come into contact with each other. As a result, the eject plate 16
, the movable plate 7 in contact with the second contact member 18b further moves in the direction of the main body support portion 2, thereby releasing the eject pin I.
4... to move the eject pins 14... in the direction of the main body support part 2, while the movable plate 7 in contact with the first contact member 18a further moves in the direction of the fixed plate 9. By doing so, the contact with the eject pin 14 is released.

Moreover, between the movable plate 7 and the fixed plate 9 when the cavity part 12 is formed, and between the eject rod 17 and the core mold 10, there is an endless chain 19 that can move up and down and serves as a conveying means. They are arranged symmetrically when viewed from the moving direction side of the moving plate 7. Each of these chains 19 is suspended on a chain wheel 20a whose upper end is located above the upper eject rod 17.
is rotatably provided on a support plate 21 formed on the fixed plate 9. The chain 19 also has chain wheels 20b and 20 whose lower ends are located below the moving plate 7.
c, and these chain wheels 20b and 2
At 0c, the moving direction is changed to the direction of the main body support part 2. The chain wheels 20b and 20c are rotatably provided on the lower support plate 22.

Furthermore, the chain 19 is suspended from other chain wheels 20d and 20e closer to the main body support portion 2 than the chain wheels 20b and 20c. One chain wheel 20d is connected to the lower support plate 22
The other chain wheel 20e is arranged above the chain wheel 20d, and its axis is aligned with the air cylinder 2.
4 and is held rotatably. This air cylinder 24 is connected to a support member 2 provided on the molding machine frame 3.
5 to apply a constant tension to the chain 19.

Further, an extrusion means is provided on the upper surface of the support member 25, and this extrusion means includes a pair of air cylinders 26 that can move the piston rod 27 in the horizontal direction, and a distal end of each piston rod 27. The extrusion plate 29 is provided to extrude the molded product 28 onto the molded product holder 31.

The molded product 28 is held in a storage frame 30, and the storage frame 30 has, for example, four holding portions that communicate in the extrusion direction, as shown in FIG. 30a... is in great shape. As a result, molded product 2
8 is adapted to be transported in units of four by the storage frame 30 described above. Note that the number of the holding parts 30a is not limited to four, but is set to a number corresponding to the number of cavity parts 12.

Furthermore, both sides of the storage frame 30 are fixed to the chain 19, and are moved up and down as the chain 19 moves up and down. At this time, the above-mentioned vertical movement is controlled by a control means (not shown) such as a sequencer. When it matches the top surface, the movement is stopped and the air cylinder 26
The extrusion plate 29 extrudes the molded product 28, and then the storage frame 30 is further moved downward to remove the upper holding part 30a.
When the lower surface of the molded product holder 31 coincides with the upper surface of the molded product holder 31, the movement is stopped and the molded product 28 is pushed out. These series of operations are performed in conjunction with the movement of the movable plate 7, etc. of the molding machine main body 1, filling of expandable thermoplastic particles, heating, cooling, mold opening, mold release, etc. It has become.

In the above configuration, the operation of operating the foam molding machine to form a molded product and placing the molded product on the molded product holder 31 will be described below.

First, as shown in FIG. 1, the movable plate 7 is moved toward the fixed plate 9, and the core mold 10 and the cavity mold 11 are clamped together to form the cavity portion 12. Then, the cavity portion 12 is filled with the raw material from the filling device 13. Thereafter, as shown in FIG. 2, the molded product 28 is shaped by heating and expanding with steam or the like, and the movable plate 7 is moved to the main body support portion 2 via the piston rod 5 and flange 6 of the cylinder 4. direction and start opening the mold. Then, when the mold is opened to such an extent that the storage frame 30 fixed to the chain 19 can enter between the core mold 10 and the cavity mold 11, the moving plate 7 is temporarily stopped. Thereafter, as shown in FIG. 3, the motor 23 is operated to raise the storage frame 30 and move the storage frame 30 between the cavity mold 11 and the core mold 10.

Next, as shown in FIG. 4, the movable plate 7 is moved in the direction of the main body support part 2 again, the movable plate 7 is brought into contact with the second contact members 18b, and the above movement is continued. , the eject plate 16 is moved in the direction of the main body support part 2 via the eject rods 17. As a result, as the eject plate 16 moves, it comes into contact with the ends of the eject pins 14, and causes the eject pins 14 to move in the same direction.

The molded product 28 is the eject pin 14...
The mold is pushed out in the direction of the storage frame 30, and is housed in each holding portion 30a at the same time as the mold is released.

When the above-mentioned molded product 28 is completely accommodated in the storage frame 30, the eject pin 14...
- is stopped, and as shown in FIG. 5, the movable plate 7 is moved toward the fixed plate 9 and mold clamping is started.

At this time, the eject pin 14... is connected to the spring 15...
... is biased in the direction of the eject plate 16. Therefore, the moving eject plate 16 is
4..., the eject pins 14... return to their original positions.

In the above mold clamping, the cavity portion 12 provided in the movable plate 7 is stopped at the origin position close to the storage frame 30, and at the same time as returning to this origin position, the storage frame 30 is chained by the operation of the motor 23. 19 and is moved downward. Then, when the storage frame 30 is moved below the core mold 10 and the cavity mold 11, the moving plate 7 is moved toward the molding machine main body 1, and the formation of the next molded product 28 is started. become.

On the other hand, the storage frame 30 that is moved downward is stopped when the lower surface of the lower holding part 30a and the upper surface of the molded product holder 31 match, as shown in FIG. After that, the air cylinder 26 is operated to move the extrusion plate 29 toward the molded product holder 31 via the piston rod 27, and the extrusion plate 29
9 pushes out the molded product 28 accommodated in the holding portion 30a onto the molded product holder 31.

Next, the extrusion plate 29 is placed on the air cylinder 2 from the storage frame 30.
6 side, and as shown in FIG. 7, the storage frame 30 is moved downward via the chain 19 by the operation of the motor 23. This downward movement is caused by the storage frame body 30
It is stopped when the lower surface of the upper holding part 30a and the upper surface of the molded product holder 31 coincide. After that, in the same way as the procedure for pushing out the lower molded product 28 described above,
6 to push out the extrusion plate 29 via the piston rod 27.
is moved toward the molded product holder 31, and this extrusion W1.29
holds the molded product 28 accommodated in the holding part 30a on the molded product holder 3
It will push it up to 1. As a result, the molded products 28 accommodated in the upper and lower holding parts 30a are both placed on the molded product holder 31 in an aligned state. When this extrusion is completed, as shown in FIG. 1, the extrusion plate 29 is pulled back toward the main body support part 2 by the operation of the air cylinder 26, and together with the storage frame 30, it is placed in a standby state until the next removal.

In this manner, the molded product 28 is transported from the molding machine main body 1 while being accommodated in the storage frame 30, so that it is prevented from being soiled due to contact with the tie bar 8 or the like, for example. Furthermore, after the molded products 28 are transported to a predetermined position by the storage frame 30, they are pushed out onto the molded product holder 31 by the extrusion plate 29, so that they are collected in an aligned state. This eliminates the need for the worker to return the collected molded products 28 to the aligned state, and unnecessary burden is reduced.

Further, the storage frame 30 holds the molded product 28 in the holding portions 30a...
・It is designed to be retained by storing it in the. Therefore, since the storage frame 30 does not require suction means such as a vacuum pump, costs can be reduced. Furthermore, since the housing in the holding portions 30a is performed together with the conventional mold release using the eject pins 14, a process for housing becomes unnecessary. Therefore,
When the molded product 28 is formed using the mold release method and mold release device of this embodiment, the device can be constructed at a relatively low cost, and the burden on the operator can be reduced without increasing the number of steps. Also, it becomes possible to prevent molded products from being contaminated.

In this embodiment, the storage frame 30 is moved using the chain 19, but the storage frame 30 is not limited to this, and may be moved using a timing belt or the like, for example. In addition, in this example, the molded product 28
The molded product holder 31 is used to place the
The present invention is not limited to this, and for example, a rack having a housing portion that matches the holding portions 30a of the storage frame 30 may be used. When this rack is used, it becomes possible to collect all the molded products 28 in an aligned state by one operation of the air cylinder 26.

Furthermore, although the eject pins 14 in this embodiment are moved by the eject plate 16, the present invention is not limited to this. For example, as shown in FIG. Air cylinders 32, 32 may be provided, and eject plates 34, 34 may be provided at the tips of piston rods 33, 33 of the air cylinders 32, 32. Note that the number of the air cylinders 32 may be one or more, depending on the number of the eject plates 34 that come into contact with the eject pins 14 . In this case, regardless of the movement of the moving plate 7 at the time of mold opening, the eject pin 1 is moved independently.
4... can be moved by driving the air cylinders 32...

Furthermore, the eject rod 17.1 supporting the eject plate 34
7 may be replaced with an air cylinder. In this case, as in the case where the air cylinder 32 is provided on the eject plate 16 described above, it can be operated independently regardless of the movement of the movable plate 7 when opening the mold. It becomes possible to move the eject pins 14 by driving the air cylinder.

〔Effect of the invention〕

As described above, the method for releasing a foamed molded product according to claim 1 includes forming a foamed molded product in a cavity portion, and then forming a molded product in communication with both surfaces corresponding to the cavity portion and facing the movable mold and the fixed mold. A storage frame body having a holding part is conveyed between a movable mold and a fixed mold, and by movement of an eject pin, the foamed molded product is accommodated in the holding part and conveyed together with the storage frame body from between the molds to the outside. The foamed molded product accommodated in the holding portion is pushed out from one side of the storage frame toward the other side at a predetermined position.

As a result, the foamed molded product formed in the cavity part is released from the mold by the eject pin, and the released foamed molded product is moved to the holding part of the storage frame and stored, so the process for storing is new. It is no longer necessary to add and,
Housing in the holding portion using the eject pin eliminates the need to provide suction means such as a vacuum pump in the storage frame, making it possible to construct the device at low cost.

Furthermore, since the foamed molded product is transported from between the molds together with the storage frame, it is possible to prevent the foamed molded product from being soiled due to contact between the foamed molded product and parts of the device. moreover,
By pushing out the foamed molded products from one side of the storage frame toward the other side at a predetermined position, it becomes possible to collect them in an aligned state, and it is possible to reduce the burden on the operator.

As described above, the mold release device for a foam molded product according to claim 2 is provided on the fixed mold side of a bottom-shaped mold consisting of a movable mold and a fixed mold that form a cavity part by clamping the mold, and An eject pin for releasing the formed foam molded product, a storage frame body having a holding part corresponding to the cavity part and communicating with both surfaces facing the movable mold and the fixed mold, and the storage frame body being a movable mold. A conveying means capable of being conveyed between the fixed molds and from between the molds to the outside; The structure includes an extrusion means capable of extruding a foamed molded product.

As a result, similar to the effect of claim 1, the foamed molded product formed in the cavity part is released from the mold by the eject pin,
Since the released foamed molded product is moved to and stored in the holding portion of the storage frame, there is no need to add a new process for storage. Further, accommodation in the holding portion using the eject pin eliminates the need to provide suction means such as a vacuum pump in the storage frame, thereby making it possible to construct the apparatus at low cost.

Furthermore, since the foamed molded product is transported from between the molds together with the storage frame, it is possible to prevent the foamed molded product from being soiled due to contact between the foamed molded product and parts of the device. moreover,
By pushing out the foamed molded products from one side of the storage frame toward the other side at a predetermined position, it becomes possible to collect them in an aligned state, and it is possible to reduce the burden on the operator.

[Brief explanation of drawings]

1 to 9 show an embodiment of the present invention. 1 to 7 are partially sectional side views of a foam molding machine equipped with a mold release device, showing a series of operations from formation to recovery of a foam molded product. FIG. 8 is a perspective view of the storage frame supported by a chain. FIG. 9 is a partially sectional side view of a foam molding machine equipped with a mold release device. 1 is the molding machine main body, 2 is the main body support part, 7 is the moving plate,
8 is a tie bar, 9 is a fixed plate, 10 is a core mold (movable type), 11 is a cavity mold (fixed type), 12 is a cavity part, 14 is an eject pin, 19 is a chain (transporting means), 20a, 20b, 20c20d" 20e is a chain wheel (transporting means), 23 is a motor (transporting means), 26 is an air cylinder (extrusion means), 28 is a molded product (foamed molded product) 3
0 is a storage frame, 30a is a holding portion, and 31 is a molded product holder.

Claims (1)

[Claims] 1. Filling a cavity formed by clamping a mold consisting of a movable mold and a fixed mold with foamable thermoplastic resin particles, and heating and expanding the resin particles with a heating medium to obtain a foam molded product. In the mold release method for foam molded products, in which the foam molded product is released and recovered by moving an eject pin, after the foam molded product is formed in the cavity, a movable mold and a fixed mold corresponding to the cavity are removed. A storage frame body having a holding part connected to both sides facing the mold is conveyed between the movable mold and the fixed mold, and the foamed molded product is accommodated in the holding part by movement of the eject pin, and is transferred together with the storage frame between the molds. 1. A method for releasing a foamed molded article, which comprises transporting the foamed article to the outside and extruding the foamed article housed in a holding part from one side of a storage frame toward the other side at a predetermined position. 2. An eject pin is provided on the fixed mold side of the mold consisting of a movable mold and a fixed mold that form a cavity part by clamping the mold, and releases the foamed molded product formed in the cavity part, and an eject pin is provided on the movable mold and the fixed mold. A storage frame body that has a holding part corresponding to the cavity part that communicates with both facing surfaces, and the storage frame body can be transported between a movable mold and a fixed mold, and can be transported from between the molds to the outside. and an extrusion means capable of extruding the foam molded product housed in the holding part from one side of the storage frame body toward the other side at a predetermined external position. Product release device.