JP3208200B2 - Method and apparatus for manufacturing a thin plate cast product - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a thin cast product.

[0002]

2. Description of the Related Art Conventionally, as a technique for manufacturing a thermosetting resin plate, a thermosetting resin is injected between a pair of dies opposite to each other at a predetermined interval, cured, and then released. The technique of obtaining a thin plate-like cast molded product is well known.

The injection of the thermosetting resin is performed by setting the room temperature of the curing processing chamber to a temperature lower than the curing temperature of the thermosetting resin, and thereafter, the temperature of the curing processing chamber is kept higher than the curing temperature for a predetermined time. After the thermosetting resin is cured while holding the mold, the mold and the molded product are carried out of the processing chamber to open the mold, and the mold opening is taken out of the mold.

As the mold, a mold or a ceramic mold such as glass is used. When the mold is used, a heating device or a cooling device is built in the mold to control the temperature of the mold and the molded product. It can be configured as follows. When a mold is used, the mold can be opened mechanically by a mold opening device. Further, when a mold is used, the molded product can be released using a knockout device at the time of release.

[0005]

However, when a precision flat plate having a very small thickness is formed, for example, since the mechanical strength of the formed product is small, it is necessary to minimize the external force applied to the formed product. Is preferred.

That is, when the mechanical strength of the molded article is low, cracking or breakage of the molded article may occur when the mold is mechanically opened by the mold opening device. Further, the knockout pin of the knockout device may be deformed or damaged.

For this reason, at present, it is considered that when the mechanical strength of the molded product is low, the mold opening and the mold release are performed only by manual operation.

By the way, at the end of thermosetting of the thermosetting resin, the molded article and the mold are completely in close contact with each other. Due to the difference, the internal stress gradually accumulates in the molded product and the mold, and eventually cracks may occur in the molded product or the mold. Of course, in the case of a mold, since the mechanical strength is stronger than that of a thermosetting resin molded product, there is no possibility that cracks will occur in the mold, but cracks will occur in the molded product.

For this reason, it is necessary to perform the work of manually releasing the mold while the accumulation of such internal stress is small. As a result, when the mechanical strength of the molded article is small as described above, the heat Immediately after curing, the mold must be released manually at a high temperature while controlling the temperature of the heating path.This makes stable release work impossible, and is the biggest bottleneck in promoting the automation of the molding process. ing.

The present invention has been completed in view of the above technical problems, and is intended to manufacture a thin plate-like cast molded article capable of automatically opening and releasing a mold even when the mechanical strength of the molded article is small. It is an object to provide a method and an apparatus thereof.

[0011]

According to the present invention, there is provided a method for manufacturing a thin plate-like cast molded product (hereinafter, referred to as a method of the present invention) in which a pair of dies which are opposed to each other at a predetermined interval are heated. Injecting a curable resin, curing, and then releasing, assuming a method of manufacturing a thin plate-shaped cast molded product, in order to achieve the above object, the heat capacity is larger than the heat capacity of the molded product, the linear expansion coefficient Is characterized in that a mold having a coefficient of linear expansion smaller than that of a molded product is used, and the mold is opened while blowing a pressurized gas between the molds at the time of mold release.

The mold used in the method of the present invention is not particularly limited as long as it has a larger heat capacity and a smaller linear expansion coefficient than the thermosetting resin molded article to be molded. And a metal such as ceramics or steel.

The pressurized air used in the method of the present invention has a function of cooling a mold and a molded article as described later, and a function of maintaining a gap generated between the mold and the molded article by cooling. For example, compressed air, vaporized liquefied gas, or the like may be used.

That is, the function of cooling the mold and the molded product by the pressurized air, and the heat capacity of the mold is larger than the heat capacity of the molded product, so that the temperature of the molded product rapidly decreases and the linear expansion coefficient of the molded product is reduced by the linear expansion coefficient of the mold. Since it is larger than the expansion coefficient, the molded article shrinks, which causes internal stress to occur at the end of the molded article and peels off from the mold from the end of the molded article. The pressurized air has a function of holding a gap generated between the molded product and the molded product.

By the way, depending on the thermosetting resin used, that is, the obtained molded product, when the mold and the molded product are cooled, fatigue occurs due to internal stress caused by the surface cooling of the molded product and the die. In this case, it is necessary to suppress the cooling temperature of the mold and the molded product to such an extent that fatigue does not occur. Therefore, the temperature of the pressurized air used in the method of the present invention is preferably adjusted to about 10 to 80 ° C.

In the method of the present invention, the pressurized gas may be blown toward at least one edge of the molded product formed between the molds, and may be blown toward one point of the one edge. Good. However, in order to make the influence of the compressed air blown into the molded article as even as possible, it is preferable to blow the air over a predetermined length of this one edge, and particularly to blow it over the entire length of this one edge. This is most preferable because the cooling pressurized air uniformly hits the entire edge of the molded product.

The pressurized air may be blown toward one edge of the molded product formed between the dies, but the compressed gas may be blown into a plurality of molded products formed between the dies. It is possible to blow towards the edge,
In this case, the homogeneity of the product can be improved, and the time required for opening the mold can be reduced. However, when the pressurized air is blown toward all edges of the molded article and over the entire length of each edge, the pressurized air can be discharged out of the mold in order to enhance the cooling function of the pressurized air. Is preferable.

In the method of the present invention, as described below,
It is possible to release the molded product from the molds on both sides at the same time as the mold is opened.However, in order to remove the released molded product without dropping it, add a mold between one mold and the molded product during release. A pressurized gas is blown, the molded product is released from the one mold and the mold is opened, then the one mold is removed, and the other mold and the molded product are cooled to release the molded product from the other mold. Is preferred.

In this case, a difference in heat shrinkage occurs between the other mold and the molded article due to the cooling of the other mold and the molded article. However, since the molded article is released from one mold, the heat shrinkage of the other mold is reduced. Instead, the difference in heat shrinkage enhances the releasability from the other mold.

Further, in this case, a method of blowing a pressurized gas to the other mold and cooling the molded article through the other mold, or a method of spraying the pressurized gas to the molded article and blowing the other mold through the molded article. A method of cooling is conceivable, but a method of blowing a pressurized gas between the other mold and the molded product is recommended in order to equalize the cooling conditions at the interface between the two.

An apparatus for manufacturing a sheet-like cast molded article of the present invention (hereinafter, referred to as the apparatus of the present invention) is for manufacturing a sheet-like cast molded article having a pair of dies which are opposed to each other at a predetermined interval. Assuming the apparatus, in order to achieve the above-mentioned object, in order to achieve the above-mentioned purpose, both heat capacities are larger than the heat capacity of the molded article and the linear expansion coefficient is constituted by a mold having a smaller linear expansion coefficient than the molded article. A positive pressure supply device for blowing a pressurized gas therebetween is provided.

Hereinafter, the device of the present invention will be described in detail. The mold of the device of the present invention is not particularly limited as long as it has a larger heat capacity than the molded product of the thermosetting synthetic resin to be molded, and has a small linear expansion coefficient. And the like.

Further, the positive pressure supply device of the apparatus of the present invention may be configured so that the pressurized gas is blown between the two dies at the time of releasing the pressurized gas. It is possible to use a positive pressure supply device including a nozzle that blows out a pressurized gas between the molds and a pressurized gas supply path that connects the pressurized gas source to the nozzle.

In this case, the temperature of the pressurized air supplied between the molds is not particularly limited, but the internal stress due to the difference in heat shrinkage occurs in the mold or the molded product cooled by the supply of the pressurized air. It is preferable that cracks and breakage do not occur in the mold and the molded product.

For this reason, depending on the type of thermosetting resin, that is, depending on the obtained molded product, the temperature of the pressurized gas flowing through the pressurized gas supply passage is adjusted to, for example, about 10 to 80 ° C. Preferably, a device is provided.

When the positive pressure supply device is provided with a nozzle for blowing a pressurized gas between the two dies, the nozzle is provided on at least one edge or at least one corner of a molded product formed between the two dies. It is provided to face.

In this case, the nozzles are provided so as to face a plurality of edges or a plurality of corners of the molded product formed between the two dies, so that the cooling state of the molded product is equalized and the product quality is equalized. And the time required for mold release can be reduced.

The number of nozzles provided at one edge or each edge of the molded article may be one or more.
However, in order to equalize the product quality by equalizing the cooling state of one end or each edge of the molded product, and to shorten the time required for mold release, a plurality of nozzles are provided at one end or each edge of the molded product. Alternatively, it is preferable to provide a nozzle that is continuous over a predetermined length along the edge, and when one nozzle is provided at one edge or each edge, continuous nozzles are provided over the entire length of one edge or each edge. It is more preferable to provide a nozzle that is opened by opening.

However, in the case where the nozzle is opened over the entire length of each edge so as to face the entire edge of the molded article, pressurized air blown toward the molded article between the nozzles is forced out of the mold. It is preferable to form a gap for discharging.

The pressurized gas source of the positive pressure supply device is not particularly limited as long as it is configured to supply a pressurized gas, and the type of the pressurized gas is not limited. However, among various gaseous species, it is preferable to use compressed air that is easily available and that does not ignite when released into the atmosphere or pollutes the atmosphere. It is recommended to use a compressed air source.

As the compressed air source, for example, a compressed air supply source such as a compressor, an air tank for storing compressed air, an air cylinder, a liquefied air cylinder for storing liquefied air, and the like are exemplified. Can be mentioned.

The positive pressure supply device may be configured to supply compressed gas between the molded article and the two dies to simultaneously release the two molded articles from the molded article. In order to take out without dropping, at the time of mold release, pressurized gas is blown between one mold and the molded product, the molded product is released from this one mold, and the mold is opened. After removing the mold, it is preferable to cool the other mold and the molding opening to release the molded article from the other mold.

For this purpose, the positive pressure supply device is configured to blow a pressurized gas between one mold and the molded product, and after opening the mold, cooling to cool the other mold and the molded product. It is conceivable to provide a device.

The cooling device may be configured so as to cool the other mold and the molded article. For example, a pressurized gas source, a nozzle for blowing the pressurized gas toward the mold, the pressurized gas A cooling device can be used that includes a pressurized gas supply that communicates the nozzle with a source.

In this case, the pressurized gas source only needs to be configured to be able to supply a compressed gas, and may be configured by a compressed air source, for example.

[0036]

According to the apparatus of the present invention, both dies are constituted by dies having a heat capacity larger than the heat capacity of the molded article and a linear expansion coefficient smaller than the linear expansion coefficient of the molded article. Since the positive pressure supply device for blowing the pressurized gas is provided, the mold can be opened while blowing the pressurized gas between the mold frames at the time of releasing the mold.

That is, the function of cooling the mold and the molded product by the pressurized air, and the heat capacity of the mold is larger than the heat capacity of the molded product, so that the temperature of the molded product rapidly decreases and the linear expansion coefficient of the molded product is reduced by the linear expansion coefficient of the mold. Since the expansion coefficient is larger than the expansion coefficient, the molded article shrinks, which causes internal stress to occur at the end of the molded article and peels off from the mold from the end of the molded article. Pressurized air enters the gap between the part and the mold, and has the effect of promoting cooling and separation of the two.

In this case, since the molded article and the mold are gradually cooled and peeled from the end of the molded article, the internal stress generated by the shrinkage of the molded article due to cooling promotes the peeling of the molded article,
In addition, it has the effect of preventing the occurrence of cracks and the like by being absorbed by this peeling.

Further, according to the method of the present invention, since the heat capacity of the mold is larger than the heat capacity of the molded article and the linear expansion coefficient of the mold is smaller than the linear expansion coefficient of the molded article, an additional force is applied between the molded article and the mold. By blowing a pressurized gas, the mold and the molded product between the two molds are thermally shrunk, and when there is a difference in thermal shrinkage, pressurized air is pushed in, and the molded product is gradually pushed from the end of the molded product from the mold. In addition, the mold is released easily and an extremely thin air layer is formed between the mold and the molded product. Since the separation of the mold and the molded product and the growth of the air layer spread to the front surface of the molded product with the progress of the cooling by the pressurized gas, an air layer is formed between the mold and the front surface of the molded product to form the molded product. This has the effect that the mold can be opened without applying any stress to the mold.

The optimum value of the supply time of the pressurized air can be easily obtained empirically, and by supplying the pressurized air over the optimum time empirically obtained, the mold can be opened or the molded product can be stably taken out. As a result, the work time for opening the mold or removing the molded product can be standardized, and automation can be easily achieved.

[0041]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a method for manufacturing a thin plate-like cast product according to an embodiment of the present invention. Will be described in detail with reference to the drawings.

FIG. 2 is a side view of the formwork device of the present invention.
The formwork apparatus 1 includes a base 2, receiving frames 3 erected on both right and left ends of the base 2, and a vacuum pad 4 for holding a mold protruding from the upper portion of the receiving frame 3 toward the other receiving frame 3. And a pair of left and right dies 5, 5 supported by the base 2 at predetermined intervals and held by the vacuum pads 4.

In the present invention, each mold 5 is not particularly limited as long as it has a larger heat capacity and a smaller linear expansion coefficient than the thermosetting resin molded article to be molded.
It can be formed of a ceramic such as glass or a metal such as steel corresponding to a molded product.

In this case, the heat capacity of the mold 5 is preferably at least 10 times the heat capacity of the molded article, and the coefficient of linear expansion of the mold 5 is not more than 1/10 of the linear expansion coefficient of the molded article. preferable.

In this embodiment, a glass 5 having a linear expansion coefficient of about 1/10 of the linear expansion coefficient of a molded article (epoxy resin) and a mold weight of about 2 kg is used, and the molded article weight is adjusted to 50 g. The heat capacity is about 20 times that of the molded product.

The formwork apparatus 1 further includes a positive pressure supply device 6 for blowing pressurized air from above both formworks 5 therebetween.

The positive pressure supply device 6 only needs to be configured to blow a pressurized gas between the two molds 5. In this embodiment, the positive pressure supply device 6 is provided between the pressurized gas source 7 and the two molds 5. There is provided a nozzle 8 for blowing out a pressurized gas, and a pressurized gas supply path 9 for connecting the pressurized gas source 7 to the nozzle 8.

The pressurized gas source 7 is not particularly limited as long as it is configured to supply a pressurized gas, and the gas type of the pressurized gas is not particularly limited. In other words, the pressurized gas source can be constituted by, for example, a compressed air source that supplies compressed air, a liquefied gas source that supplies vaporized liquefied gas, and the like. In this embodiment, the compressed gas source is a compressed air source that is easily available and that does not ignite upon release to the atmosphere or pollute the atmosphere. 7 are configured.

Examples of the compressed air source include a source for compressing the atmosphere such as a compressor, an air tank for storing compressed air, an air cylinder, and a liquefied air cylinder for storing liquefied air. It can be mentioned as.

In this embodiment, in order to save the cost of providing a new special pressurized air source, the pressurized gas source 7 is constituted by an air compressor constituting the pressurized air system 10 provided in the factory. . Also, in order to save the installation cost, most of the pressurized gas supply path 9 is constituted by a pipe 11 of a pressurized air system provided in a factory, and the remaining part is provided by a branch provided in the pipe 11. It is composed of a hose 13 connected to the joint 12.

Since the filter 11 and the dehumidifying trap 15 are interposed in the pipe 11, clean dry compressed air at normal temperature is blown from the nozzle 8.

The nozzle 8 may be provided so as to face at least one edge or at least one corner of the molded product 16 formed between the two dies 5. In this case, the cooling state of the molded product 16 can be equalized, cracks can be prevented, the product quality can be equalized, and the time required for mold release can be reduced. Can be achieved.

As shown in FIGS. 4 to 7, the nozzle 8 may be provided so as to face at least one edge or a corner of the molded product 16, and one edge of the molded product 16 may be provided. Alternatively, the number of nozzles provided to face each edge may be one or more. However, the cooling state of one end or each edge of the molded product 16 is equalized to prevent the occurrence of cracks in the molded product 16 and improve product quality. As shown in FIG. 5, for example, as shown in FIG.
A plurality of nozzles 8 are provided at one end or each edge of 6, or
As shown in FIG. 4, it is preferable to provide a nozzle 8 that continuously opens over a predetermined length along the edge.

When one nozzle 8 is provided at one end or each edge of the molded product, as shown in FIG. 4, the nozzle is continuously opened over the entire length of one or each edge of the molded product 16. More preferably, a nozzle 8 is provided.

However, in the case where the nozzle 8 is opposed to all the edges of the molded article 16 and is opened over the entire length of each edge, as shown in FIG. 6, each nozzle is provided opposite to each edge. From the nozzle 8 to a position facing each corner,
It is preferable to form an exhaust path for discharging the pressurized air blown out toward the outside of the mold.

In this embodiment, in order to simplify the configuration,
As shown in FIG. 4, one nozzle 8 that opens toward one edge of the molded product 16 is provided, and the cooling state of this edge is equalized to prevent cracking of the molded product 16 and In order to equalize the product quality and shorten the time required for releasing, the opening of the nozzle 8 is continuously opened over the entire length of one end edge of the product 16.

Next, an embodiment of the method of the present invention implemented using the above-described embodiment of the present invention will be described with reference to the drawings.

An epoxy resin material having a weight of about 50 g is poured between a pair of right and left ordinary glass molds 5 held by the vacuum pad 4 and cured by heating at 100 to 180 ° C. in an oven. Take out under the environment, fix the nozzle 8 of the positive pressure supply device 6 on the upper side of both
Room temperature compressed air was supplied at a pressure of cm ² .

By the supply of the compressed air, the molded product 16 and the mold 5 are cooled in order from the upper part, and as shown in FIG. At this time, since the surface of the molded product 16 shrinks more than the surface of the mold 5, a shear force acts on the boundary surface between the mold 5 and the molded product 16, and the mold 5 and the molded product 16 are separated from each other. 5 to molded product 1
6 gradually separates, and a gap is formed between the mold 5 and the molded product 16. Then, when the pressurized air flows into the gap, an extremely thin air layer 17 is formed between the separated molded article 16 and the mold 5.

The internal pressure of the air layer 17 eventually rises to the supply pressure of the compressed air, and this pressure helps to increase the distance between the molded product 16 and the mold 5. 16 are sequentially peeled from the mold 5, and the area of the air layer 17 is gradually enlarged.

When the area of the air layer 17 is increased, the pressure acting on the surface of the molded article 16 and the mold 5 is increased in proportion to the increase of the area. From the molded product 1
The mold opening is completed by separating from the surface of No. 6.

In this example, the mold opening was completed by supplying compressed air of about 2 kg / cm ² for about 10 seconds.

Thereafter, as shown in FIG. 3, one mold (the left mold in this case) 5 is removed, and the nozzle 8 is directed to the boundary between the upper edge of the molded product 16 and the other mold 5 to pressurize the compressed air. About 1kg
/ Cm ² , the compressed air was introduced into the air layer 17, and the molded product 16 was easily peeled off the mold 5 and could be removed from the mold 5 in about 5 seconds.

The molded product 16 taken out of the mold 5 was visually confirmed to be free from cracks, distortion, and the like.

[0065]

The apparatus of the present invention has the above-mentioned structure, and has a heat capacity of a mold larger than a heat capacity of a molded article and a linear expansion coefficient smaller than a linear expansion coefficient of a molded article. Since the positive pressure supply device that blows pressurized air is provided between the molds, it is possible to extremely easily open the mold while blowing the pressurized gas between the mold frames when releasing the mold.

In this case, the supply of the compressed air cools the molded article and the mold in order from the top, and an internal stress is generated in the molded article that shrinks inward, and the surface of the molded article largely shrinks. Since a shear force acts on the boundary surface with the article and the mold and the molded article are gradually separated from the end of the molded article, no crack, distortion, or the like occurs in the molded article taken out of the mold.

In the apparatus of the present invention, in particular, the positive pressure supply device includes a pressurized gas source, a nozzle for blowing the pressurized gas between the two molds, and a pressurized gas supply passage for communicating the pressurized gas source with the nozzle. When it is provided, the structure is simple and the price of the device is extremely low.

In particular, in this case, when a temperature adjusting device for adjusting the temperature of the pressurized gas flowing inside the pressurized gas supply passage to 30 to 80 ° C. is provided, the surface of the molded article is supercooled. Since the internal stress due to the temperature difference in the molded article can be prevented from becoming excessive, the occurrence of cracks, distortion, and the like of the molded article when the mold is opened can be further prevented.

In the apparatus of the present invention, in particular, when the nozzle is provided so as to face at least one edge of the molded product formed between the two dies, the pressurized gas is applied to the molded product formed between the dies. As a result of being blown towards at least one edge, the molded article can be easily peeled off from one end of the molded article.

In the apparatus of the present invention, when the nozzle is provided to face at least one corner of the molded product formed between the two dies, a pressurized gas is supplied to the molded product formed between the dies. As a result, the molded product can be easily peeled from one corner portion of the molded product.

In the apparatus of the present invention, when the nozzle is provided so as to face a plurality of edges of the molded product formed between the two dies, a pressurized gas is supplied to the plurality of molded products formed between the dies. As a result, the molded article can be cooled and peeled more quickly, and the mold can be opened in a shorter time.

In the apparatus of the present invention, particularly when one nozzle is arranged to face one edge or one corner of a molded product, the structure of the positive pressure supply device having the nozzle can be simplified. it can. In this case, when the nozzle is continuously opened over one end edge of the molded article formed between the two molds or over a predetermined length of each edge, the pressurized gas is applied to the molded article formed between the molds. Since it can be continuously blown into one or each edge over a predetermined length or more, the molded article can be cooled and peeled more quickly.

In this case, if the nozzle is continuously opened over one end of the molded product formed between the two molds or over the entire length of each edge, pressurized gas is supplied to the molded product formed between the molds. Since it can be blown continuously over the entire length of one end or each edge, there is an effect that a more uniform molded product can be obtained in a short time.

In the apparatus of the present invention, in particular, when the pressurized gas source of the positive pressure supply device is constituted by a compressed air source, pressurized air is used as the pressurized gas, and the pressurized gas can be easily obtained. In addition, it is advantageous because there is no danger of ignition or pollution of the atmosphere when the pressurized gas is blown onto the mold and the molded product.

When the apparatus of the present invention is provided with a cooling device for cooling the mold, when the mold is released, the mold is opened by blowing a pressurized gas between the mold and the molded product, and then the one mold is removed. Then, the other mold and the molded article can be cooled to release the molded article from the other mold.

In the apparatus of the present invention, when the cooling device is provided with a pressurized gas source, a nozzle for blowing out the pressurized gas toward the mold, and a pressurized gas supply passage for communicating the nozzle with the pressurized gas source, This has the advantage that the structure of the device becomes simpler and the price of the device decreases.

In this case, when the pressurized gas source is constituted by a compressed air source, pressurized air is used as the pressurized gas, so that the pressurized gas can be easily obtained and the pressurized gas can be obtained. This is advantageous because there is no danger of ignition or air pollution when the gas is blown onto the molds and moldings.

According to the method of the present invention, the heat capacity of the mold is larger than the heat capacity of the molded article, and the linear expansion coefficient of the mold is smaller than the linear expansion coefficient of the molded article. The mold and the molded article are cooled and thermally contracted, particularly from the end of the molded article, and the molded article is gradually peeled off from the end by the stress generated by the difference in heat shrinkage. The molded product can be easily peeled from the mold by forcing compressed air, and the molded product is separated from the molded product by the pressure of the pressurized gas pressed between the mold and the molded product caused by this peeling without manual operation. The mold can be opened without applying a stress to the mold, or the molded product can be removed from the mold.

In the method of the present invention, when the pressurized gas is blown toward at least one corner of the molded article formed between the molds, the pressurized air is thermally shrunk from the corner. Due to the difference, the product can be reliably fed between the separated molded article and the mold, and the mold can be reliably opened.

The optimum values of the pressure and the supply time of the pressurized air can be easily obtained empirically. By supplying the pressurized air over the empirically obtained optimum time, the mold can be opened or stably opened. Since the molded product can be taken out, the work time for opening the mold or taking out the molded product can be standardized, and automation can be easily achieved.

In the method of the present invention, when the pressurized gas is blown toward at least one edge of the molded article formed between the molds, the pressurized air is subjected to the heat shrinkage difference from the edge. As a result, the mold can be reliably fed between the separated molded article and the mold, and the mold can be reliably opened.

In the method of the present invention, when the pressurized gas is blown toward a plurality of edges of the formed article formed between the dies, the molded article and the mold are separated from the plurality of edges. Since it can be advanced, the time required for opening the mold can be further reduced.

In the method of the present invention, particularly when the pressurized gas is continuously blown into one end or each edge of the molded article formed between the dies over a predetermined length or more, the pressure at the edge may be reduced. The temperature distribution on the surface of the molded article can be averaged, and the temperature gradient can be prevented from increasing in the length direction of the edge. As a result, the molded article is less likely to crack due to internal stress caused by a sharp temperature gradient.

In this case, especially when the pressurized gas is continuously blown over one end or the entire length of each edge of the molded product formed between the molds, the entire length of one edge or each edge is required. Thus, it is possible to prevent the temperature gradient from increasing in the length direction of the edge, and it is difficult for the molded article to crack over the entire length of the edge due to internal stress caused by the rapid temperature gradient.

In the method of the present invention,
When the mold is opened by blowing a pressurized gas between the mold and the molded article, one mold is removed, and then the other mold and the molded article are cooled to release the molded article from the other mold. Is
After the mold is opened, the molded article can be easily taken out of the mold, and the molded article can be prevented from dropping from the mold and being damaged or deformed.

[Brief description of the drawings]

FIG. 1 is a principle view showing a peeled state of a molded product according to the method of the present invention.

FIG. 2 is a side view of the device of the present invention.

FIG. 3 is a side view showing a procedure for removing a molded product.

FIG. 4 is a schematic view showing an arrangement of nozzles of the apparatus of the present invention.

FIG. 5 is a schematic view showing another nozzle arrangement of the apparatus of the present invention.

FIG. 6 is a schematic view showing another nozzle arrangement of the apparatus of the present invention.

FIG. 7 is a schematic view showing another nozzle arrangement of the apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Formwork apparatus 5 type 6 Positive pressure supply apparatus 7 Pressurized gas source 8 Nozzle 9 Pressurized gas supply path

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Fumio Hiramatsu 1-1-2 Shimohozumi, Ibaraki-shi, Osaka Nitto Denko Corporation (56) References JP-A-5-77246 (JP, A) JP-A-2-111509 (JP, A) JP-A-53-7788 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 39/02-39/12 B29C 39/22 -39/34 B29C 33/38-33/42 B29C 43/02-43/20 B29C 43/32-43/58

Claims (4)

(57) [Claims] 1. A method for manufacturing a thin plate-shaped cast molded product, comprising: injecting a thermosetting resin between a pair of dies opposite to each other at a predetermined interval, curing the resin, and releasing the cured resin. A thin plate characterized by using a mold having a larger thermal capacity and a smaller linear expansion coefficient than the molded product's linear expansion coefficient, and opening the mold while blowing pressurized air between the mold frames when releasing the mold. Manufacturing method of cast molding. 2. A mold is opened by blowing a pressurized gas between a mold and a molded product at the time of release from the mold. Then, the one mold is removed, and the other mold and the molded product are cooled to remove the molded product. The method for producing a thin plate-like cast product according to claim 1, wherein the mold is released from the other mold. 3. An apparatus for manufacturing a thin cast molded product comprising a pair of dies which are arranged opposite to each other at a predetermined interval, wherein both dies have a heat capacity larger than a heat capacity of the molded product and a linear expansion coefficient. Is composed of a mold smaller than the linear expansion coefficient of the molded product,
An apparatus for manufacturing a thin plate-like cast product, comprising a positive pressure supply device for blowing pressurized air between both molds at the time of mold release. 4. A cooling device for cooling a mold.
2. The apparatus for manufacturing a thin plate-shaped cast molded product according to 1.).