JPH07214242A - Molding method using pressure resistant collapsible core for molding - Google Patents

Abstract

PURPOSE:To obtain molded goods having excellent quality and shapes of a wide range without receiving restrictions on the shapes by using a pressure resistant collapsible core and specifying a method of removing this core. CONSTITUTION:The pressure resistant collapsible core 1 is formed by using the collapsible material, such as paper and grains, and is disposed between a cope 2 and a drag 3 to form a mold 4. A molding material, such as molten aluminum, synthetic resin or ceramic material is poured according to the material quality of molded goods into a cavity part 5, by which the molded goods meeting the shape of this cavity part are formed. The removal of the pressure resistant collapsible core 1 is executed by removing the removable parts and removing the remaining heat of the parts where the remaining heat is removable. The remaining parts are almost completely removed and dissipated by dissolution using a solvent, such as water, or combustion by heating, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding method using a pressure-resistant collapse core for molding, and in particular, a pressure-resistant collapse core for molding without using a sand core which has been conventionally generally used as a core. By using a core and a specific method of removing the pressure-resistant collapse core for molding, the range of core material selection can be expanded, and molded products with a wide range of shapes can be obtained without being restricted in shape. A molding method using a pressure-resistant collapse core for molding, which is capable of efficiently forming a hollow shape or an undercut shape into a molded product such as a cast product, a plastic molded product, or a ceramic molded product Is.

[0002]

2. Description of the Related Art Molding by molding methods such as casting adopted as a part of machine work, injection molding adopted as a part of plastic molding, and injection molding adopted as a part of ceramic molding In order to form a hollow portion or an undercut portion, a product has heretofore been molded using a non-disintegrating core or a disintegrating core to obtain the molded product.

By the way, as the former (non-disintegrating core), there is a metal core, which is used not only in casting but also as a molding method such as injection molding adopted as a part of plastic molding or a part of ceramic molding. However, it has a problem that it cannot be used except for those that can be directly punched or deformed, and the range of use is limited to that of a specific shape.

As the latter (disintegratable core), a sand core is generally used in casting for obtaining a cast product among the above-mentioned molded products, but it is difficult to mold and easily disintegrates. Not only is it difficult to handle, but it is also difficult to meet the conflicting conditions of pressure resistance during casting and disintegration after casting.

Therefore, in recent years, in the casting, it has been proposed to obtain a cast product by casting using a core having a special coating on the surface of the sand core, but there are various problems. Because of the points, I could not solve the problem.

That is, it is difficult and time-consuming to form a plurality of coating layers, and it is difficult to achieve the purpose. Further, it is difficult to completely remove after molding, and sand-baking is required. It takes time and money. In addition, sand cores are difficult to mold, require equipment and man-hours, are fragile, difficult to handle, require man-hours, have poor yield, require complicated pressure adjustment to prevent collapse, and after casting Since it is difficult to completely disintegrate, it requires a heat treatment process, a sand drop process, and a sand drop inspection, which requires man-hours and takes time and money. In addition, defective products such as cavities are generated in the cast product due to the insertion of the molten metal during casting and the penetration of sand core components into the cast product, resulting in poor casting yield, poor productivity, and the core after casting. It was difficult to completely remove the sand, and adhesion caused problems such as product wear and damage. Also,
Complex shapes and large ones are difficult or impossible to cast and have a limited range of applications, which hinders design and production. Furthermore, the sand of the sand core to be reused contains a coating layer and a binder, which is difficult to completely remove, which is time-consuming and expensive. In addition, since the sand core is difficult to mold, handle, and disintegrate after casting, many steps are required, the yield is poor, and it takes a lot of time and cost.

[0007] Further, in the same way as the above-mentioned casting, various molded articles can be molded by a molding method such as injection molding adopted as a part of plastic molding or a molding method such as injection molding adopted as a part of ceramic molding. There was a problem.

For example, the core must be formed of a specific material having pressure resistance and heat resistance during molding, which makes core molding difficult and costly. There was a problem.

For this reason, in order to solve these problems, during molding used to first form a hollow shape or an undercut shape into a molded product such as a cast product, a plastic molded product or a ceramic molded product. In a core, the molding core is formed from synthetic resin (plastic), a molding method using the molding core, and a molding method using the molding core Although a molded product was proposed,
Depending on the size and shape of the molded product, the cost may increase, and depending on the properties of the molded product such as the wall thickness of the molded product, there is a possibility that molding defects such as sink marks, wrinkles, and porosity may occur. There was a problem.

Therefore, as a result of continued research, an optimum pressure resistant collapse core for molding which can solve these various problems, a molding method using the pressure resistant collapse core for molding, and the pressure resistance It was possible to investigate a molded product molded using the disintegrating core.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems by adopting the following constitution.

That is, for example, in casting in which a cast product is obtained from the above-mentioned molded products, by adopting a molding method using a pressure resistant collapse core for molding, required conditions such as pressure resistance and heat resistance are satisfied. The core material can be relaxed, the selection range of core materials can be expanded, the pressure resistance and heat resistance can be adjusted by selecting the material and amount, and the man-hours can be reduced by facilitating core molding and handling. And reduce costs.

Further, by using a pressure-resistant disintegrating core that does not use a permeating component such as a binder, and preventing the core component from penetrating into a cast product, the occurrence of defects such as cavities is prevented, Prevents the occurrence of defective castings, contributes to yield improvement and productivity improvement, and also avoids the occurrence of problems such as molten metal insertion during molding while maintaining pressure resistance (non-collapseability),
Further, it facilitates the disintegration of the core after molding and the removal of the core component, prevents the core from adhering to the molded product, and prevents the molded product from failing such as abrasion or damage.

Furthermore, a pressure-resistant collapse core for molding is used,
By making it easy to form hollow parts and undercut parts, and improving core strength, it is possible to cast all shapes and sizes regardless of shape and size, expanding the range of application and increasing the viscosity. The absence of binders and other difficult-to-remove components facilitates the collapse and removal of the core after casting, prevents the occurrence of pollution, reduces the number of steps, and reduces the time and cost.

Further, even when a molded article is obtained by a molding method such as injection molding adopted as a part of plastic molding or a molding method such as injection molding adopted as a part of ceramic molding, the above-mentioned pressure resistance for molding is obtained. By using the disintegrating core, a desired molded product is obtained, and a molded product excellent in quality is efficiently obtained.

With the structure of the pressure-resistant collapse core for molding, even in the case of plastic molding or ceramic molding, it is possible to improve the productivity and expand the range of application, and as in the case of the above-mentioned casting. , By using the pressure-resistant collapse core for molding, the molding of the core is facilitated, the molding equipment is simplified, the process is reduced, the time and cost are reduced, the handling is facilitated, and the transportation is facilitated. And easy to store,
The conventional problems such as the reduction of man-hours such as the need for pressure adjustment during molding and the reduction of time and cost are solved.

The present invention prevents molding defects such as sink marks, wrinkles, and porosity with a simple structure and has a hollow shape, an undercut shape, or the like, or a large-sized molded article or a molded article having a complicated shape. In addition to enabling the molding of a wide variety of molded products, the quality of the molded products is improved, and the productivity of the molded products is dramatically improved, resulting in significantly lower costs and casting products. Another object of the present invention is to provide a molding method using a pressure-resistant collapse core for molding, which enables efficient molding of molded products such as plastic molded products and ceramic molded products.

[0018]

According to the present invention, the object is to use a pressure-resistant core formed of a collapsible material such as paper, fiber or grain as the core. A pressure resistance for molding, characterized in that a molding die such as a mold, a plastic molding die, or a ceramic molding die is formed, and a molding product such as a cast product, a plastic molding product, or a ceramic molding product is molded using the molding die. It is achieved by providing a molding method using a sex-disintegrating core.

[0019]

According to the present invention as described above, there are the following actions.

That is, according to the present invention, the molding method using the pressure-resistant collapse core for molding is characterized in that the pressure-resistant collapse core for molding is used as the core, thereby improving the productivity. The idea is to expand the scope of application and efficiently obtain molded products with excellent quality. By using collapsible material such as waste paper that is usually discarded as a raw material, By molding and using a disintegrating core, there is a great effect that the material cost can be significantly reduced compared to the case of using a conventional sand core or resin core. , For example, among the molding pressure-resistant collapse cores used to form molded products such as the above-mentioned cast products, plastic molded products, ceramic molded products, etc. In the case of the molding method used, Uses a pressure-resistant collapse core for molding, relaxes the conditions such as required pressure resistance and heat resistance, and expands the selection range of core materials. The pressure resistance and heat resistance of the core can be adjusted, the core molding can be facilitated, the molding equipment can be simplified, and the number of processes can be reduced, so that the time and cost can be reduced.

Further, since the pressure-resistant collapse core is used and the strength is improved, the man-hours such as handling, transportation and storage are facilitated, the time and cost can be reduced, and the pressure-resistant collapse core is a binder. Since it does not contain permeation components such as, the core components are prevented from permeating into the molded product, which prevents the occurrence of defects such as cavities, prevents the defective products from forming, and improves the yield. Therefore, productivity can be improved.

Further, using a pressure resistant collapse core for molding,
It is easy to form hollow parts and undercut parts that were not possible in the past, and since core strength is improved, it is possible to mold all shapes and sizes regardless of shape and size. Can be expanded. In addition, by using a core that has the reciprocal conditions of pressure resistance during molding and disintegration such as disappearance after molding, it is possible to avoid problems such as inserting molten metal during molding and to withstand pressure (non-collapse). Property), and facilitates the disintegration such as the disappearance of the core after molding and the removal of core components, prevents the adherence to the molded product, and prevents the molded product from being worn or damaged. It is possible to prevent the occurrence of defects.

Furthermore, since the pressure-resistant disintegrating core does not contain a difficult-to-remove component such as a binder and has a disintegrating property after molding, the core can be easily removed to prevent pollution. In addition, the number of steps can be reduced and the time and cost can be reduced.

Furthermore, even when a molded product is obtained by a molding method such as injection molding adopted as a part of plastic molding or a molding method such as injection molding adopted as a part of ceramic molding, the above-mentioned molding pressure resistance is used. By using a disintegrating core, and by further specifying the method for removing the pressure-resistant disintegrating core for molding, the desired molded product is obtained, and a molded product with excellent quality can be efficiently obtained. You can

According to the structure of the molding method using the pressure-resistant collapse core for molding described above, it is possible to improve the productivity and expand the applicable range even in the case of plastic molding or ceramic molding. , As in the case of the above casting, by using a pressure resistant collapse core for molding, molding of the core becomes easy, molding equipment is simplified, and the number of steps is reduced,
Time and cost can be reduced, handling is easy, transportation and storage are easy, pressure adjustment during molding is not required, and man-hours are reduced. There are various actions such as being possible.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

1 to 4 show a first embodiment of a molding method using the pressure-resistant collapse core for molding according to the present invention.

That is, the present invention does not use a sand core, which is generally widely used as a core, and is a collapsible material such as paper, fiber or grain which is usually considered to be difficult or unusable. Molding characterized by forming a hollow shape or undercut shape into a molded product such as a cast product, a plastic molded product, or a ceramic molded product by using a molding core with pressure resistance formed from This is a molding method using a pressure-resistant collapse core.

Further, in the present invention, as the pressure-resistant collapse core for molding, a molding core having a pressure resistance made of a collapsible material is used, and a mold, a plastic molding die, or a ceramic molding is used. A forming die such as a die is formed, and a molded product is manufactured using the forming die.

Then, a molded product using the molding pressure-resistant collapse core is used to mold a molded product such as a cast product, a plastic molded product, or a ceramic molded product.

Therefore, the disintegrating core for molding used in the present invention has a non-disintegrating property such as heat resistance and pressure resistance at the time of molding for molding a molded product, and after molding, it is resistant to water and the like. It is required to have disintegration properties such as extinction property (removability) that is eliminated and removed by a solvent or the like, and heat extinction property that is eliminated by residual heat or heating.

Further, the pressure-resistant collapse core for molding is required to have a condition that does not exert a bad influence on a molded product such as generation of a large amount of gas at the time of molding.

As a result of continuing research, the applicant of the present invention has found out that a collapsible material is suitable as the pressure-resistant collapse core for molding, and here, it collapses as a pressure-resistant collapse core for molding. A molding method using a pressure resistant collapse core for molding having pressure resistance made of a possible material will be described.

The core 1 made of a collapsible material (hereinafter referred to as "pressure resistant collapsible core") 1, which is the molding core, is made of a collapsible material such as paper, fiber or grain.

The pressure-resistant collapsing core 1 is formed of a collapsible material into a solid shape having pressure resistance, as shown in FIG.

Therefore, the pressure-resistant collapse core 1 has non-disintegration properties such as heat resistance and pressure resistance at the time of molding for molding a molded product, and is removed by a solvent such as water after molding. It is formed to have disintegration such as disappearance (removability).

The pressure-resistant collapse core 1, which is the pressure-resistant collapse core for molding, can be used to form a molded product such as a cast product, a plastic molded product, or a ceramic molded product.

For example, when a pressure-resistant collapse core 1 which is the pressure-resistant collapse core for molding is used to mold a molded product such as a cast product, a plastic molded product or a ceramic molded product, it is often possible to obtain the result shown in FIG. As shown, the pressure-resistant collapse core 1 is disposed between the upper mold 2 and the lower mold 3 to form a mold 4 having a cavity 5.

Next, as best shown in FIGS. 1 and 2, a material suitable for the material of the molded product is injected into the cavity 5 formed in the molding die 4 while pressurizing.

In this case, the disintegrating core 1 has pressure resistance (non-disintegrating property) at the time of molding a molded product, and also has extinguishability (removability) or heat disappeared by residual heat or heating after molding. Since it has disintegration property such as disappearance property, and further, it has a condition that does not give a bad influence to a molded product such as generating a large amount of gas at the time of molding, therefore, by maintaining its shape at the time of molding, A molded product that contributes to the formation of the desired molded product 6 and that after molding is dissolved and removed by a solvent such as water, there is no residual residue and that the inner surface is smoothed, etc. Can contribute to the molding of.

Subsequently, as well shown in FIGS. 2 and 3, the molded product 6 formed as described above is taken out from the molding die 4 to complete the molding.

Although not shown in the drawing, unnecessary parts such as burrs of the molded product 6 can be removed to obtain a finished product.

In this embodiment, a molded product such as a cast product, a plastic molded product or a ceramic molded product is molded by using the molding pressure resistant collapse core as described above. Among the molding methods using a child, a casting method using a pressure resistant collapse core for molding a cast product will be described.

Here, a description will be given of a case where die casting is performed as one of the cases of performing the casting, and a case of using the pressure resistant collapse core as the pressure resistant collapse core for molding.

That is, in this embodiment, casting is performed in the following steps.

First Step First, although illustration is omitted, in the same manner as described above, a collapsible material is used, and as shown in FIG. The disintegrating core 1 is molded.

The pressure-resistant disintegrating core 1 has non-disintegrating properties such as heat resistance and pressure resistance at the time of molding a molded product, and is removed and disappears by a solvent such as water after molding. It is formed to have a disintegrating property such as property (removability).

Second Step Subsequently, as best shown in FIG. 1, the pressure-resistant collapse core 1 is disposed between the upper mold 2 and the lower mold 3, and the cavity 5 is formed.
Forming a mold 4 having

Third Step Next, as best shown in FIGS. 1 and 2, pressure is applied to the molten metal such as aluminum molten metal in the cavity 5 formed in the mold 4 depending on the material of the cast product. Pouring while adding.

At this time, since the pressure-resistant collapse core 1 has a large heat capacity, it has a high heat resistance against the molten metal, and also has a high pressure resistance, so that even if the high-pressure molten metal is poured during molding, The initial shape can be retained without deformation or pressure deformation.

Further, the temperature of the molten metal is considerably lower than the initial temperature (for example, about 660 ° C. for aluminum molten metal) by the time it reaches the cavity 5 of the mold 4, so Due to its own temperature and heat capacity, the pressure-resistant collapse core 1 can maintain its initial shape without immediate melting due to the reflection effect and the temperature effect even if the molten metal acts.

Therefore, the casting 6 having a shape corresponding to the shape of the hollow portion 5 is cast in a state where the original shape is maintained without deforming the pressure-resistant collapse core 1.

The pressure-resistant collapse core 1 contributes to the formation of a desired casting 6 by maintaining its shape during casting, and is dissolved by a solvent such as water after casting. Since it is removed and eliminated, no residue remains, which can contribute to the casting of a cast product having excellent quality such as smoothing the inner surface.

Subsequently, as well shown in FIGS. 2 and 3, the casting 6 formed as described above is taken out from the mold 4, thereby completing the casting.

Fourth Step Further, although not shown, unnecessary parts such as burrs of the cast product 6 can be removed to obtain a finished product.

Therefore, compared with the conventional casting method which required the following 10 steps, only 4 steps are required and 6 steps are omitted.

That is, the conventional method using the sand core is as follows.
It looks like this: (1) Core molding → (2) Core coating mold → (3) Core drying → (4) Mold formation → (5) Casting by pouring molten metal →
(6) Casting sand removal → (7) Casting sand heat treatment (sand baking) → (8) Casting sand removal inspection → (9) Casting deburring → (10) Finished product.

As described above, in the case of die casting, which is the first embodiment of the molding method using the pressure resistant collapse core for molding of the present invention, the pressure resistant collapse core 1 has a shape during casting. By holding the above, it contributes to the formation of the desired casting product 6, and after casting, it is dissolved and removed by a solvent such as water, so that there is no residual portion, so that the inner surface is smoothed. It can contribute to the casting of high-quality cast products.

By casting the pressure-resistant collapse core 1 in a state where the original shape is maintained without being deformed, a cast product 6 having a shape corresponding to the shape of the cavity 5 can be obtained. .

The following are examples of the disintegrating core 1 used to obtain the molded product 6.

That is, first, there is a core made of a paper material such as waste paper. For example, a paper material such as waste paper is dispersed through water or the like and then pressure-molded to form a predetermined shape. ,
Further, it can be dehydrated and dried to form the collapsed core 1 having a predetermined shape.

The collapsed core 1 thus formed is
It becomes rigid and has a non-disintegrating property such as pressure resistance and heat resistance at the time of molding of the molded product, and has a disintegrating property such as disappearance (removability) after molding,
By maintaining the shape when molding a molded product,
In addition to contributing to the desired formation of the molded article 6, after the molding, due to its disintegration property, it is dissolved and removed by a solvent such as water, so that there is no residue.

In this case, the disintegrating core 1 has a non-disintegrating property such as pressure resistance and heat resistance during molding of a molded product, and has disintegrating property such as disappearance (removability) after molding. In addition, since it is provided with conditions that do not adversely affect the molded product, such as generating a large amount of gas during molding, by maintaining its shape during molding,
A molded product that contributes to the formation of the desired molded product 6 and that after molding is dissolved and removed by a solvent such as water, there is no residual residue and that the inner surface is smoothed, etc. Can contribute to the molding of.

Then, the disintegrating core 1 which is the disintegrating core for molding
Can be used to form the desired molded article 6.

At this time, since the disintegrating core 1 has a large heat capacity, it has high heat resistance against injection of a molding material such as molten metal, and also has high pressure resistance. Even in such a case, the initial shape can be maintained without thermal deformation or pressure deformation.

Further, the temperature of the molten metal or the like is set to an initial temperature (for example, by the time it reaches the cavity 5 of the molding die 4 such as the above-mentioned mold).
Since the temperature of aluminum molten metal is considerably lower than that of about 660 ° C., the collapsing core 1 has a reflection action and a temperature action due to its own temperature and heat capacity even if the molten metal acts. As a result, the initial shape can be retained without immediately disappearing.

Therefore, a molded product 6 having a shape corresponding to the shape of the hollow portion 5 is formed in a state where the collapsed core 1 is maintained in its original shape without being deformed.

In this case, the disintegrating core 1 can be removed by, for example, supplying water to the disintegrating core 1 in the cast product 6 which is a molded article, immersing the disintegrating core 1 in water, and disintegrating with the water. Casting product 6 which is a molded product by melting core 1 and making it muddy
Can be removed and eliminated from the cast product 6 by discharging it to the outside.

The disintegrating core 1 is not limited to the core made of a paper material such as the above-mentioned waste paper, but can be made of other disintegrating materials.

For example, as the disintegrating core 1, there is a core made of grains such as rice, which includes grains such as rice, millet, acne, corn, etc. After applying, pressure molding to form a predetermined shape,
Further collapsed core 1 having a predetermined shape and pressure resistance
Can be formed.

At this time, for example, in the case of using the roasted rice, it is heated with water or the like to give viscosity, and then pressure-molded to form a predetermined shape, and further cooled to obtain a collapse core 1 having a predetermined shape. Can be formed, and the collapsing core 1 becomes so rigid that it cannot be broken unless it is split with a hammer.
When forming a molded product, it has non-disintegration properties such as pressure resistance and heat resistance at the time of molding, and has disintegration properties such as extinction (removability) after molding, and a large amount of gas during molding. Therefore, the condition that does not give a bad influence to the molded product such as the occurrence of the above is provided, and it becomes possible to contribute to efficiently obtain a molded product having excellent quality.

Then, the disintegrating core 1 which is the disintegrating core for molding
Can be used to form the desired molded article.

Further, there is a core made of a material in which a plurality of disintegratable materials are mixed, and for example, there is a material in which a paper material such as waste paper and a grain such as rice are mixed. Collapse core 1 that is pressure-molded and has a pressure resistance of a predetermined shape
Can be formed.

The disintegrating core 1 is not limited to these, but may be any disintegrating core for molding which is made of a disintegratable material, and may be pressure-molded by a single or a plurality of disintegratable materials other than these. Thus, the collapsed core 1 having a predetermined shape and pressure resistance can be formed.

In this case, in the present embodiment, the pressure-resistant collapse core 1 is removed by, for example, supplying water to the plant core 1 in the cast product 6 which is a molded product to perform the pressure-resistant collapse core. To remove and eliminate the pressure-resistant collapse core 1 by immersing the child 1 in water and discharging it in a muddy state to the outside of the cast product 6 which is a molded product, to thereby remove it from the cast product 6. Can be done.

The pressure-resistant disintegrating core 1 is removed by burning the residual heat alone or in combination with the residual heat and the heating or by the heating alone depending on the shape and size thereof. It is also possible to remove and disappear from within 6.

At this time, as a heating and removing method, there are heating by a burner, heating in a heating tank, and other heating methods. In any case, the special molding core after molding is completely removed by heating. You can

Further, the removal of the special core after molding can be carried out by using the removal disappearance by the solvent such as water and the removal disappearance by the heating in combination.

The pressure-resistant disintegrating core 1 can be dissolved and removed by other solvent, particularly an organic solvent, in combination with residual heat or heating, or by itself, in addition to the removal and disappearance by water.

As the solvent, normal alkylbenzene (trade name "Nonion" etc.) was sufficiently satisfactory in terms of function and cost, and there was no problem in actual use.

Examples of the other solvent include the following.

For example, tetrachloroethane, methylene chloride, chloroform, 1,1,2 trichloroethane, etc. were able to obtain the same effect.

The solvent of the present invention is not limited to the solvent of the above-mentioned examples as long as it can dissolve the molding special core, and it is needless to say that various solvents can be used. The same effects as those in the above-described embodiment can be exhibited by performing heating or heating alone.

Further, the pressure-resistant collapse core 1 is prepared by pouring the molten metal into the hollow portion 5 and, after a predetermined time has passed, after the molten metal has cooled and solidified, it is heated by a solvent such as water or residual heat or heating. Since it is removed and eliminated, the pressure-resistant collapse core 1 is removed from the molded product 6.
Can be easily removed.

At this time, since the pressure-resistant disintegrating core 1 is basically removed by a solvent such as water or residual heat or heating and removed, no residue remains. However, depending on the shape, the solvent such as water or residual heat is removed. It can be reused by extracting the whole or a part and reprocessing it as the material of the pressure-resistant collapse core 1 without melting the whole by heating or heating, and can reduce the material cost.

When the pressure-resistant disintegration core 1 is not completely removed or is difficult or impossible to remove due to residual heat, the pressure-resistant disintegrating core 1 can be removed entirely by being removed by a solvent such as water or by heating. it can.

In this case, in this embodiment, the part that can be extracted is extracted, and the part that can remove residual heat is removed by residual heat, and the remaining part is removed by a solvent such as water or by heating. Disappear.

The disintegrating core 1, especially the disintegrating core 1 which is removed by heating with a solvent such as water or by heating, has a pressure-resistant core made of a paper material such as waste paper. There is a pressure-resistant core that is formed by dispersing the paper material of (1) through water or the like, press-molding it into a predetermined shape, and then dehydrating and drying it, or consisting of grains such as rice. There are pressure-resistant cores, for example, grains such as rice, millet, acne, corn, etc., which are heated with water or the like to give viscosity and then formed into a predetermined shape and then cooled. There is a pressure-resistant core formed by, or a pressure-resistant core made of a mixture of a plurality of collapsible materials, such as paper materials such as waste paper and grains such as rice. It is possible to disintegrate without being limited to this. The pressure resistance of a material may be a pressure-resistant collapsible core having.

In each of these molding disintegrating cores, the part that can be extracted is extracted, and the part that can remove residual heat is removed by residual heat. The remaining part is dissolved or heated by a solvent such as water. Almost all of them can be removed and disappeared by burning due to.

Not only these disintegrating cores but also those disintegrating by a solvent such as water or by heating,
Of course, it can also be applied to a collapse core made of another material.

As described above, according to the molding method using the pressure-resistant collapse core for molding of the present invention, defects such as wear and damage of the cast product 6 can be prevented, and the quality can be improved. Since the occurrence of defects such as porosity is prevented and the appearance quality and the functional quality are excellent, the yield is improved, and the man-hours are significantly reduced, and the cast product 6 having excellent quality can be efficiently obtained. As a result, the time and cost can be saved and the productivity can be improved.

The molding method using the pressure-resistant collapse core for molding of the present invention is not limited to die casting as one of the casting methods shown in the above-mentioned embodiments, but is specific to the die casting method. It is possible to further improve the quality of the cast product by adding steps, and the present invention is not limited to the above-mentioned embodiment, and many modifications can be considered.

In the above embodiment, the case of performing die casting as one of the casting methods has been described. However, the molding method using the pressure resistant collapse core for molding of the present invention is limited to the die casting. Needless to say, it can be applied to a cast product cast by a sand mold gravity casting method, a mold gravity casting method, a low-pressure casting method, a precision casting method, or another casting method, and has the same excellent properties as those of the above embodiment. You can get the effect.

In this case, the effect of the present invention is particularly large in the gravity casting method.

That is, in the gravity casting method, the residence time of the molten metal during casting is longer than that of other casting methods, the time in which the molten metal contacts the core is long, and the temperature of the molten metal is relatively high. In particular, the core is required to have pressure resistance and heat resistance, but when the molding pressure resistant collapse core 1 is used, it has a large heat capacity and is used for molding when pouring molten metal. Since the temperature rise of the pressure-resistant collapse core 1 is relatively small, the heat resistance to the molten metal is high, and the pressure resistance is also high, so that even if the molten metal having a long residence time at the time of casting is poured, thermal deformation or pressure deformation does not occur. In addition, the initial shape can be retained, and it can contribute to the formation of the intended casting product 6.

Even in this case, the pressure-resistant collapse core 1
Has a non-disintegrating property such as heat resistance and pressure resistance when casting a cast product, and has a disintegrating property such as disappearance (removability) that is removed and removed by a solvent such as water after casting. Since it is provided with the condition that it does not adversely affect the cast product such as generation of a large amount of gas at the time of casting, it can contribute to efficiently obtain a cast product having excellent quality.

The pressure-resistant collapse core 1 which is the pressure-resistant collapse core for molding can be used to form a desired cast product. In this case, the pressure-resistant collapse core 1 is disposed between the upper mold 2 and the lower mold 3 to form the mold 4 having the cavity 5, and then the mold 4 is molded in the same manner as in the above-described embodiment. By injecting the molding material into the cavity 5 formed inside,
The target molded product 6 can be molded.

In this case, since the temperature of the molten metal is considerably lower than the initial temperature by the time it reaches the cavity 5 of the mold 4, the pressure resistant collapse core 1 has improved pressure resistance. In combination with this, the temperature rise of the pressure resistant collapse core 1 when pouring the molten metal is relatively small due to its own temperature and heat capacity, the heat resistance to the molten metal is high, and the pressure resistance is also improved. Even when pouring the high-pressure molten metal at that time, the initial shape can be maintained without thermal deformation or pressure deformation such as immediate melting due to the reflection effect and the temperature effect.

Further, the pressure-resistant collapse core 1 has a normal cavity 5
After pouring the molten metal into the molten metal for a predetermined time, the molten metal is cooled and solidified and then discharged and removed.

Thus, the removal of the pressure-resistant collapse core 1 is
Basically, the part that can be extracted is extracted, and the part that can remove residual heat is removed by residual heat, and the part remaining by these is removed and eliminated by a solvent such as water or by heating.

As a result, the pressure-resistant collapse core 1 is completely removed and disappeared without leaving a residue. However, depending on the shape, the whole or part of the core 1 is extracted and reprocessed as the material of the pressure-resistant collapse core 1. It can be reused and the material cost can be reduced.

Further, not only these pressure-resistant collapsing cores for molding but also those having a collapsible property can be applied to the pressure-resistant collapsing core 1 having pressure resistance made of another collapsible material. Of course.

The solvent of the present invention is not limited to the solvent of the examples as long as it can dissolve the pressure-resistant collapse core for molding, and it is needless to say that various solvents can be used. Alternatively, the same effects as those in the above-described embodiment can be exhibited by performing heating or heating alone.

The molding method using the pressure-resistant collapse core for molding of the present invention is not limited to the casting method of the above embodiment, and many modifications are conceivable. Further, molding methods other than the casting method are possible. It can be applied to molding cores used in molding methods such as injection molding adopted as part of plastic molding and injection molding adopted as part of ceramic molding. The problem can be solved.

The pressure-resistant collapse core 1 which is the molding core has non-disintegration properties such as pressure resistance and heat resistance at the time of molding for molding a molded product, and has a disappearance property after molding. It has a disintegrating property such as (removability), and has a condition that does not adversely affect the molded product such as generating a large amount of gas during molding. By maintaining the shape during molding, It contributes to the efficient production of desired intended molded products of excellent quality, and after molding, it is removed and eliminated by a solvent such as water or by heating, etc. It is possible to prevent defects such as damage and breakage, improve the quality of molded products, improve yield, save time and cost, and improve productivity. Become

Furthermore, the molding method using the pressure-resistant collapse core for molding of the present invention is not limited to the case obtained by each of the above-mentioned molding methods, and a specific step is added to further improve the quality of the molded product. However, the present invention is not limited to the case of being obtained by the above-mentioned molding method, and many modifications can be considered.

Next, referring to FIGS. 1 to 4, it is adopted as a part of plastic molding which is a molding method other than the casting method which is the second embodiment of the molding method using the pressure resistant collapse core for molding of the present invention. A molding method using a pressure-resistant collapse core for molding which is applied to a molding method such as injection molding and a molding method adopted as a part of ceramic molding such as injection molding will be described.

That is, in this embodiment, as one of molding methods using the pressure-resistant collapse core for molding, the pressure-resistant collapse core 1 is used, which is a molding method other than the casting method, such as plastic molding or ceramics. A case of applying to molding will be described.

First Step First, although not shown, in the same manner as in the above-mentioned embodiment, as shown in FIG. 4 using paper materials such as waste paper or grains such as rice and other collapsible materials. First, the pressure-resistant collapse core 1 having a solid shape and pressure resistance is molded.

Second Step Subsequently, as shown in FIG. 1, the pressure-resistant collapse core 1 is disposed between the upper die 2 and the lower die 3 to form the cavity 5
Forming mold 4 having

Third Step Next, as shown in FIGS. 1 and 2, the cavity 5 formed in the mold 4 using the pressure-resistant collapse core 1 is well shown.
Depending on the material of the molded product, synthetic resin (plastic)
By injecting a molding material such as or ceramics while applying pressure, a molded product 6 having a shape corresponding to the shape of the cavity 5 is injection molded.

At this time, since the pressure-resistant collapse core 1 has a large heat capacity, the temperature rise upon injection of a molding material such as synthetic resin (plastic) or ceramic is relatively small, and the heat resistance is high. Moreover, since the pressure resistance is high, the initial shape can be maintained without thermal deformation or pressure deformation even by the high temperature at the time of molding, which can contribute to the formation of the intended molded product 6.

Further, the temperature at the time of injecting the molding material is considerably lower than the initial temperature by the time it reaches the cavity 5 of the molding die 4, so that the pressure-resistant collapse core 1 is
Even if the high temperature acts due to its own temperature and heat capacity, the initial shape can be maintained without immediate melting due to the reflection effect and the temperature effect.

Therefore, the molded product 6 having a shape corresponding to the shape of the hollow portion 5 can be obtained in a state where the original shape is maintained without deforming the pressure resistant collapse core 1.

Next, after the molding is completed, the molded product 6 formed as described above is taken out from the molding die 4.

At this time, the pressure-resistant disintegrating core 1 is basically removed by a solvent such as water or residual heat or heating as in the above-mentioned embodiment, so that no residue remains. Can be reused by extracting it in whole or in part and reprocessing it as a material for the pressure-resistant collapse core 1 without dissolving it in a solvent such as water or residual heat or heating, and reducing the material cost. Can be planned.

When the pressure-resistant disintegrating core 1 is not fully extracted or is difficult or impossible to remove due to residual heat, it can be entirely removed by removing it with a solvent such as water or heating. it can.

In this case, in this embodiment, as in the case of the previous embodiment, the extractable portion is extracted, and the residual heat removable portion is residual heat removed. It can be easily removed from the molded product 6 by being removed and disappeared by a solvent such as or by heating.

As described above, the pressure-resistant collapse core 1 contributes to the formation of the desired molded product 6 by maintaining its shape during molding, and is removed and eliminated after molding. It can be removed without leaving any residue.

Therefore, it is possible to prevent defects such as wear and breakage of the product, improve the quality of the molded product, improve the yield, and further save time and cost. It becomes possible to improve the sex.

Fourth Step Further, as shown well in FIG. 3, the molded product 6 formed as described above is taken out from the molding die 4 and is subjected to pressure-resistant collapse by a solvent such as water or heating as described above. Since the molding is completed when the child 1 is removed and disappears, unnecessary parts such as burrs of the molded product 6 are removed to form the molded product 6 as a desired final product.

The molded product 6 thus formed is a molded product in which the occurrence of defects is prevented and which is excellent in appearance quality and functional quality.

The molding method using the pressure-resistant collapse core for molding of the present invention includes a molding method such as injection molding adopted as a part of plastic molding and an injection molding adopted as a part of ceramic molding. Even when it is applied to various molding methods, it has an excellent effect as in the case of the pressure resistant collapse core for casting used in the casting, and the conventional problems can be solved.

Therefore, by casting using a metal core that is widely used as a conventional molding core, there is no restriction on the size and shape of the molded product as compared with the case where a molded product is obtained. All shapes and sizes can be molded, the man-hours can be significantly reduced, and a molded product with excellent quality can be efficiently obtained.

As described above, according to the molding method using the pressure-resistant collapse core for molding of the present invention, the pressure-resistant collapse core for molding retains its shape at the time of molding to achieve the desired purpose. In addition to contributing to the formation of a molded product, after molding, the molded product is melted and removed by residual heat or heating to be removed and no residue remains, so that the molding pressure-resistant collapse core 1 can be easily removed from the molded product 6, and The range of material selection can be significantly expanded, core molding becomes easier, cost can be reduced, defects such as product wear and damage can be prevented, and the quality of molded products can be improved. At the same time, the yield can be improved, time and cost can be saved, and productivity can be improved.

Also, when the molding method using the pressure-resistant collapse core for molding as one of the embodiments of the present invention is applied to plastic molding or ceramic molding, which is a molding method other than the casting method, Not limited to the injection molding of the embodiment, it is of course applicable to other molding methods,
Many modifications are conceivable, and the same effect as the above embodiment can be obtained.

The pressure-resistant collapse core 1 which is the molding core used in this embodiment has non-disintegration properties such as pressure resistance and heat resistance at the time of molding for molding a molded product and after molding. Has a disintegrating property such as disappearance (removability),
Moreover, it is required to have a condition that does not adversely affect a molded product such as generation of a large amount of gas at the time of molding, but as a core material having this condition, it is possible to disintegrate paper, grain or the like. There are the following materials.

That is, the pressure-resistant disintegrating core 1 has a pressure-resistant core made of a paper material such as waste paper, for example, after the paper material such as waste paper is dispersed with water as a medium. There is a pressure-resistant core formed by pressure-molding into a predetermined shape and further dehydrated and dried, or a pressure-resistant core made of grains such as rice, which includes, for example, Rice,
There are grains such as millet, acne, corn, etc., which are heated with water etc. to give viscosity and then formed into a predetermined shape,
There is a core with pressure resistance formed by further cooling,
Alternatively, a pressure-resistant core made of a material obtained by mixing a plurality of disintegratable materials, for example, a pressure-resistant core made of a paper material such as waste paper and grains such as rice, However, the invention is not limited to this, and any pressure-resistant collapse core made of a collapsible material and having pressure resistance may be used.

Each of these pressure-resistant collapse cores for molding is
The part that can be taken out is taken out, and the part that can remove residual heat is removed, and the remaining part can be almost completely removed by dissolution with a solvent such as water or combustion by heating.

Not only these disintegrating cores but also those disintegrating by a solvent such as water or by heating,
Of course, it can be applied to the pressure resistant collapse core made of other materials.

The pressure-resistant collapse core 1 is
The part that can be taken out is taken out, and the part that can remove residual heat is removed, and the remaining part can be almost completely removed by dissolution with a solvent such as water or combustion by heating.

Further, not only these pressure-resistant collapse cores,
Needless to say, it can be applied to a disintegrating core made of another material as long as it is disintegratable by a solvent such as water or by heating.

Next, the operation of the molding method using the pressure-resistant collapse core for molding according to this embodiment will be described.

That is, according to the present invention, the molding method using the pressure-resistant collapse core for molding is characterized in that the pressure-resistant collapse core for molding is used as the core, thereby improving the productivity. The idea is to expand the range of application and efficiently obtain molded products with excellent quality. By using collapsible materials such as waste paper, which is usually discarded, as a raw material, the pressure resistance for molding can be improved. By molding and using the collapse core, there is a great effect that the cost of the material cost can be significantly reduced compared to the case of using a conventional sand core or resin core. For example, among the molding methods using a pressure resistant collapse core for molding used for forming a molded product such as a cast product, a plastic molded product, a ceramic molded product, etc. In case of molding method using Te is, there is the action of the following. (1) By using the pressure resistant collapse core for molding, conditions such as pressure resistance and heat resistance required for the core can be relaxed and the selection range of the core material can be expanded. (2) By using the pressure resistant collapse core for molding, the pressure resistance and heat resistance of the core can be adjusted by selecting the material and the amount thereof. (3) By using the pressure-resistant collapse core for molding as the core, molding of the core becomes easy, and molding equipment is simplified.
Moreover, the number of steps can be reduced, and the time and cost can be reduced. (4) Since the molding pressure-resistant collapse core is used as the core,
It will not break even if dropped or thrown, so it will be easy to handle,
Man-hours such as easy transportation and storage are reduced, and time and cost can be reduced. (5) Since the pressure-resistant disintegrating molding core to be used does not contain a permeating component such as a binder, the core component is prevented from permeating into the molded product, so that a defect such as a porosity may occur. It is prevented, defective products of molded products are prevented from occurring, yield is improved,
Productivity can be improved. (6) By using the pressure-resistant collapse core for molding as the core, it becomes easy to form the hollow portion and the undercut portion, and the core strength is improved. The shape and the whole size can be molded, and the application range can be expanded. (7) By using a core that has the reciprocal conditions of pressure resistance during molding and disintegration after molding, it is possible to avoid problems such as molten metal insertion during molding and to improve pressure resistance (non-disintegration). Maintaining and facilitating core disintegration after molding and complete removal of core components, prevent adhesion to molded products, and prevent molded product defects such as abrasion and damage of molded products be able to. (8) The pressure-resistant disintegrating core for molding does not contain components that are difficult to remove, such as a binder, and has disintegrating properties after molding, so that the core can be completely removed easily and no pollution occurs. In addition to being able to prevent it, the number of steps can be reduced, and the time and cost can be reduced. (9) The pressure-resistant collapse core for molding can be withdrawn from the molded product after molding a part or most of it depending on the shape, and thus the extracted core can be reused without discarding. Not only is it possible to prevent pollution, but it is also possible to reduce material costs due to reuse.

Further, in the present invention, the pressure-resistant collapse core for molding is removed by removing the part that can be removed and removing the residual heat by removing the residual heat. It can be removed and eliminated by a solvent such as water or by heating, and the molding pressure-resistant collapse core can be easily removed regardless of the type and shape of the cast product.

Further, since the pressure-resistant collapse core is made of a material capable of collapsing, the pressure-resistant collapse core can be dissolved and removed in combination with residual heat or heating, or alone with a solvent such as water.

For example, when the pressure-resistant collapse core for molding is a pressure-resistant collapse core made of a disintegratable material, the solvent is, for example, water, with residual heat or heating, or alone. It can be melted and removed, and the pressure-resistant collapse core for molding can be easily discharged and removed.

Even when a molded product is obtained by a molding method such as injection molding adopted as a part of plastic molding, or a molding method such as injection molding adopted as a part of ceramic molding, the molding pressure resistance of the present invention is obtained. By applying a molding method using a disintegrating core, the pressure-resistant disintegrating core for molding can be easily discharged and removed, and the same effect as in the case of the above casting can be exerted. It is possible to contribute to the efficient production of a desired desired molded article.

Further, even when a molded product is obtained by a molding method such as injection molding adopted as a part of plastic molding or a molding method such as injection molding adopted as a part of ceramic molding, the molding pressure resistance of the present invention is obtained. By using the molding method using the sex-disintegrating core, it is possible to efficiently obtain a desired molded product having excellent quality.

The productivity can be improved and the range of application can be increased. By using the pressure resistant collapse core for molding, molding of the core can be facilitated and molding equipment can be simplified.
In addition, the number of processes is reduced, time and cost can be reduced, handling is easy, transportation and storage are easy, and pressure adjustment during molding is not required. There are various advantages such as reduction of

Next, FIG. 5 shows a third embodiment of the molding method using the pressure-resistant collapse core for molding of the present invention. The pressure-resistant collapse core 1 which is the pressure-resistant collapse core for molding is A filling space S is formed inside, and the filling space F is filled with a heat-resistant filling material F in the form of powder, particles, or lumps.

That is, the pressure-resistant collapse core 1 which is the pressure-resistant collapse core for molding of the present invention is filled with the heat-resistant filling material F in the form of powder, particles or lumps.

First, although not shown in the drawings, a core body H having one end opened and a filling space S formed in a hollow shape is molded using a collapsible material such as waste paper or grain, The filling space S is filled with a heat-resistant powdery, granular, lump-like, or the like filling substance F, and the opening is closed, so that the filling space S is filled with the filling substance F as shown in FIG. A pressure-resistant collapse core 1 having the filled pressure resistance is formed.

Then, by molding using the mold 4 using the pressure-resistant collapse core 1 which is the pressure-resistant collapse core for molding in which the filling substance F is filled, a cast product, a plastic molded product or The molded product 6 such as a ceramic molded product is molded.

Therefore, the pressure-resistant disintegrating core 1 used in the present invention is not filled with the pressure resistance and heat resistance at the time of molding of the molded product in the state where the filling substance F is filled inside as described above. In addition to having disintegration property, it has disintegration property such as extinction property (removability) after molding, and has a condition that does not give adverse effects to the molded product such as generation of a large amount of gas at the time of molding. Therefore, it is required to be able to contribute to efficiently obtain a molded product having excellent quality.

Then, the filling material F is
Unrestricted state (free state) after the core body H is removed and disappeared
Therefore, it is required that the molded product 6 can be easily discharged and removed. Examples of materials that satisfy this condition include powder, granules, and lumps, which can be easily removed without leaving a residue, and the quality of the molded product 6 can be improved.

Further, the filling substance F is required to have a condition that does not exert a bad influence on the molded product such as generation of a large amount of gas at the time of molding.

Further, the filling substance F is required to have heat resistance at the time of molding, and as a material satisfying this condition, foundry sand, resin sand obtained by mixing the foundry sand with a resin, or calcium carbonate (white ink) ), Silica stone, metal, ceramic and others.

By using the pressure-resistant collapse core 1 for molding, a molded product such as a cast product, a plastic molded product, or a ceramic molded product can be formed.

For example, when a pressure-resistant collapse core 1 which is the pressure-resistant collapse core for molding is used to mold a molded product such as a cast product, a plastic molded product, or a ceramic molded product, it is possible to obtain a good result as shown in FIG. As shown, the pressure-resistant collapse core 1 can be disposed between the upper mold 2 and the lower mold 3 to form the mold 4 having the cavity 5.

Next, as shown in FIGS. 1 and 2, in the cavity 5 formed in the mold 4, in the case of aluminum die casting, a molten metal such as an aluminum molten metal is used depending on the material of the cast product. A molded product 6 such as a cast product is molded by pouring molten metal while applying pressure.

At this time, since the pressure-resistant collapse core 1 has a large heat capacity, it has high heat resistance to the molten metal, and also has high pressure resistance, so that even if the high-pressure molten metal is poured during molding, The initial shape can be retained without deformation or pressure deformation.

Further, the temperature of the molten metal is considerably lower than the initial temperature (for example, about 660 ° C. in the case of aluminum molten metal) by the time it reaches the cavity 5 of the mold 4, Due to its own temperature and heat capacity, the pressure-resistant disintegrating core 1 can retain its initial shape without being immediately melted due to the reflecting action and the temperature action even if the molten metal acts. Therefore, the molded product 6 such as a cast product having a shape corresponding to the shape of the hollow portion 5 is formed in a state where the original shape is maintained without deforming the pressure resistant collapse core 1.

Subsequently, as well shown in FIGS. 2 and 3, the molded product 6 such as the cast product formed as described above is taken out from the molding die 4 to complete the molding.

Furthermore, unnecessary parts such as burrs of the molded product 6 can be removed to obtain a finished product.

At this time, as well shown in FIG. 1 and FIG. 2, by using the pressure resistant collapse core 1 in which the filling space S is filled with the filling substance F, molding such as pouring of molten metal is performed. The pressure resistance at the time can be maintained, the deformation can be prevented and the original shape can be maintained, and the heat resistance at the time of the molding can be improved to contribute to the molding.

Next, FIG. 6 shows a fourth embodiment of the molding method using the pressure-resistant collapse core for molding of the present invention, which is used for the molding method using the pressure-resistant collapse core for molding. The pressure-resistant collapsible core 1 which is a core has a filling space S formed inside a core body H having a pressure resistance formed of a collapsible material, and the filling space S has heat resistance. Is filled with the powdered, granular, or lumped filling material F having the above, and the protective layer 7 is formed on the surface (outer surface) thereof.

The core body H has the conflicting conditions of non-disintegration such as pressure resistance and heat resistance at the time of molding and disintegration such as disappearance after molding, and generates a large amount of gas at the time of molding. It is required to satisfy the conditions that do not adversely affect the molded product.

The protective layer 7 is required to meet the reciprocal conditions of non-disintegration such as heat resistance during molding and disintegration such as heat dissipation after molding. It is integrally formed with a predetermined thickness on the surface of H.

The protective layer 7 is, for example, a heat resistant protective layer made of a heat resistant resin or the like.

As the material for forming the heat-resistant protective layer 7, heat-resistant rubber such as silicon rubber and fluororubber, heat-resistant synthetic resin resin such as silicon resin and fluororesin, low melting point metal, old ceramics and new ceramics are used. There are ceramics such as ceramics (fine ceramics) and other heat resistant materials.

That is, as the synthetic resin (plastic) as a material for forming the heat-resistant protective layer 7, a thermoplastic synthetic resin (thermoplastic) is most suitable and satisfies all the above conditions. It is possible to obtain a cast product or other molded product that sufficiently satisfies the intended purpose.

Polycarbonate synthetic resin (polycarbonate plastic) is the most suitable of the thermoplastic synthetic resins (thermoplastics), and has both of the above-mentioned conditions. It is possible to obtain a sufficiently satisfactory cast product or other molded product.

Further, next to this, a fluororesin (polyfluoroethylene resin) such as tetrafluoroethylene resin, a polyimide resin (polyimide plastic), a polyamide-imide resin (polyamide-imide plastic)
There is a polysulfone resin (polysulfone plastic), which has all of the above conditions, and a cast product or other molded product satisfying the intended purpose can be obtained.

Next to this, there are polyamide resin (nylon resin) and polypropylene resin (polypropylene plastic), which meet all of the above conditions and obtain a cast product which satisfies the initial purpose. You can

Further, other examples include polyethylene resin (polyethylene plastic) and polyester resin (tetron resin), which have all of the above-mentioned conditions and obtain a cast product satisfying the initial purpose. be able to.

Further, the protective layer 7 formed on the surface (outer surface) of the pressure-resistant collapse core 1 used in the molding core of this embodiment is not limited to the above synthetic resin, and the molded product 6 is molded. In addition to having non-disintegration such as heat resistance during molding,
After molding, it has a disintegration property such as heat dissipation (removability) that is removed and lost by residual heat or heating of the molded product, and does not give adverse effects to the cast product such as generating a large amount of gas during casting. If so, it goes without saying that a synthetic resin other than the above-mentioned examples can also be used, and the same effects as the above-mentioned examples can be obtained.

In the pressure-resistant collapse core 1 of the present invention, the filling space S is formed inside the above embodiment, and the filling space S is formed.
Is not limited to one having a heat-resistant powdery, granular, or lumpy filling material F and a protective layer 7 formed on the surface (outer surface) thereof. Of course, the protective layer 7 may be formed on the surface (outer surface) of the solid core body H without the filling substance F.

According to the pressure-resistant collapse core 1 for molding as described above, the pressure resistance (non-collapseability) at the time of molding is further improved without impairing the disintegration property such as heat dissipation (removability) after molding. In addition, since it is provided with the condition that the molded product is not adversely affected such that a large amount of gas is generated at the time of molding, it can contribute to efficiently obtain a molded product having excellent quality.

Using the pressure-resistant collapse core 1 having the protective layer 7 formed on the surface (outer surface) in this manner, in the same manner as in the above-mentioned embodiment, a cast product, a plastic molded product, or a ceramic molded product is obtained. A molded product such as a product can be formed.

In this case, the pressure-resistant collapse core 1 having the protective layer 7 formed on the surface (outer surface) is disposed between the upper mold 2 and the lower mold 3, and the mold having the cavity 5 is formed. After forming 4,
By injecting a molding material into the cavity 5 formed inside the molding die 4 in the same manner as in the above-described embodiment, the desired molded product 6 can be molded.

Next, FIG. 7 shows a fifth embodiment of the molding method using the pressure-resistant collapse core for molding of the present invention, which is used for the molding method using the pressure-resistant collapse core for molding. The pressure-resistant collapse core 1 which is a core has a filling space S formed therein,
Further, the filling space S is filled with a heat-resistant powdery, granular, or lumpy filling material F, and a coating layer 8 is formed on the surface (outer surface) thereof.

The coating layer 8 protects the core without melting due to high heat during molding and residual heat after molding.

The pressure-resistant collapsible molding core 1 used in this example is composed of a core body H having pressure resistance formed of a collapsible material, a molten metal during casting, and residual heat after casting. And a coating layer 8 having a predetermined thickness integrally formed on the surface of the core body so as to protect the core body while maintaining the original shape without melting.

Further, the core body H has both conflicting conditions of non-disintegration such as pressure resistance and heat resistance during molding and disintegration such as disappearance after molding, and at the same time, a large amount of gas is formed at the time of molding. It is required to satisfy the condition that the molded product is not adversely affected such as generation.

Furthermore, the coating layer 8 protects the core body by maintaining its original shape without melting due to high heat during molding and residual heat after molding, and is a heat-resistant coating made of, for example, a heat-resistant resin. There are layers.

Further, as a material for forming the heat resistant coating layer 8, there is silicon having excellent heat resistance such as silicon resin or silicon rubber, and the original shape thereof is not melted by high heat during molding and residual heat after molding. It can be held to protect the core body H.

In the pressure-resistant collapse core 1 of the present invention, the filling space S is formed inside the above embodiment, and the filling space S is formed.
Is not limited to the one in which the heat-resistant powdery, granular, or lumpy filler material F is filled, and the coating layer 8 is formed on the surface (outer surface) thereof. Needless to say, the coating layer 8 may be formed on the surface (outer surface) of the solid core body H without the filling substance F.

According to the pressure resistant collapse core 1 for molding as described above, the pressure resistance (non-disintegration property) at the time of molding can be achieved without impairing the disintegration property such as disappearance (removability) of the core body H after molding. ) Can be further improved, and it is possible to further improve the conditions that do not adversely affect the molded product such as generating a large amount of gas at the time of molding, so that molding with excellent quality can be achieved. It can contribute to the efficient production of products.

Then, using the pressure-resistant collapse core 1 having the coating layer 8 formed on the surface (outer surface) thereof, a cast product, a plastic molded product, or a ceramic molded product is manufactured in the same manner as in the above embodiment. And the like can be formed.

In this case, the pressure-resistant collapse core 1 as the pressure-resistant collapse core for molding having the coating layer 8 formed on the surface (outer surface) is arranged between the upper mold 2 and the lower mold 3, After forming the mold 4 having the cavity 5, the target molding 6 is molded by injecting the molding material into the cavity 5 formed inside the mold 4 in the same manner as in the above-described embodiment. be able to.

Then, the core body H is removed by a solvent such as water or residual heat or heating after a predetermined time has passed after the molding material is injected into the cavity 5 and molded.

However, the heat-resistant coating layer 8 is very excellent in heat resistance and retains its original shape without being melted by the residual heat or heating of the molded product 6 not only during molding but also after molding. Therefore, the core body H is wrapped in a sealed state to protect it, and the core body H is melted and removed by residual heat or heating of the molded product 6, so that the core body H contains an organic synthetic resin. Even if the core body H generates gas due to, for example, it is possible to completely prevent the generation of gas from the pressure-resistant collapse core 1 for molding, and prevent the components of the core body H from penetrating into the molded product 6. It is possible to prevent the adverse effect on the molded product, prevent the defective molded product 6 from occurring, prevent the defective product of the molded product 6, and contribute to the formation of the desired molded product 6. You can

Since the heat-resistant coating layer 8 has the inner core body H melted and removed by residual heat or heating of the molded product 6, the content of the molded product 6 is in the form of an empty bag (balloon state). It can be easily taken out from inside.

In this embodiment, there are the following effects.

(1) The heat-resistant coating layer that protects the core body so as to wrap it inside prevents the components of the core body from penetrating into the molded product, thereby preventing adverse effects on the molded product. However, it is possible to prevent the occurrence of defects in the molded product and prevent the generation of defective molded products, thereby improving the yield and improving the productivity. (2) Since the heat-resistant coating layer of a predetermined thickness made of a synthetic resin such as silicon having excellent heat resistance is integrally formed on the surface of the core body, the core body can be protected so as to be wrapped inside. The shape-retaining function of the pressure-resistant collapse core for molding during injection of the molding material has been improved, and the initial shape can be retained more reliably without melting in the molding material, resulting in excellent dimensional accuracy and quality of the molded product. It can be better. (3) In particular, since synthetic resins such as silicon are excellent in flexibility and elasticity, they can form a uniform wall thickness from thin to thick ones, and from small to large ones regardless of size. A heat-resistant coating layer can be formed on the surface of the child body with a predetermined thickness, and even complicated shapes can be easily integrally formed, the molding work is simplified, and the finished product can be easily obtained.
Furthermore, the quality of the molded product can be further improved. (4) In particular, since silicon has excellent heat resistance and releasability, it does not adhere to molded products, and it does not melt not only during molding but also after heat and heating after casting. Since the core body is protected by holding the core, the molding is easy and the core can be easily removed after molding, and a finished product having excellent quality can be easily obtained. (5) Especially, since the main element of silicon is inorganic silicon (Si), no gas is generated at the time of molding, and even if the core body contains an organic synthetic resin, it is not necessary at the time of molding. It retains its original shape without melting even with residual heat or heat after molding and protects the core body by wrapping it in a sealed state inside, so that gas generation from the pressure-resistant collapse core for molding can be completely prevented, and the molded product Can be prevented and the quality of the finished product can be improved. (6) In particular, since silicon is excellent in flexibility, elasticity, and releasability, and also has high strength, it can be used as a non-disintegrating core not only for direct punching but also for deformation punching. It becomes easy to pull out the pressure resistant collapsible core, and the molded product can be easily molded. The molding pressure-resistant collapse core of the present invention is not limited to the above-mentioned embodiments, and many modifications can be considered.

Further, the molding method using the pressure-resistant collapse core for molding of the present invention is not limited to the materials and shapes of the above-mentioned examples, and is applied to various shapes using various materials. It is possible to improve the quality of the molded product and the like, and it is not limited to the above-mentioned embodiment, and many modified examples are possible.

For example, the pressure-resistant disintegrating core for molding of the above-mentioned embodiment has a solid shape in view of non-disintegration at the time of molding, but is not limited to this, and weight reduction, cost reduction, Also, from the viewpoint of ease of disintegration / removal after molding, it is needless to say that a hollow shape can be used.

Further, the molding method using the pressure-resistant collapse core for molding of the present invention, even when used in various molding methods such as plastic molding and ceramic molding, which are molding methods other than the above-mentioned casting, The present invention is not limited to the materials and shapes of the above embodiments, but can be applied to various shapes using composite materials and other materials other than the above embodiments, and can improve the quality of molded products. .

Further, the material of the pressure-resistant collapse core for molding used in the molding method using the pressure-resistant collapse core for molding of the present invention is not limited to the pressure-resistant collapse core shown in the above embodiment. In addition to having non-disintegration properties such as pressure resistance and heat resistance at the time of molding, it also has disintegration properties such as heat loss (removability) that is removed and lost by residual heat or heating of the molded product after molding. As long as it is a collapsible material, it can be a single material or a mixed material of a plurality of materials, or a composite material, and a pressure resistant collapse core for molding using various materials is conceivable. It is possible to obtain various effects.

The molding method using the pressure-resistant collapse core for molding of the present invention is not limited to the above-mentioned embodiments, and many modifications are conceivable.

Further, the material of the molding disintegrating core used in the molding method using the molding pressure-resistant disintegrating core of the present invention is not limited to the collapsible materials shown in the above-mentioned Examples.
In addition to having non-disintegration properties such as pressure resistance and heat resistance during molding, it also has disintegration properties such as heat loss (removability) that is removed and lost by residual heat or heating of the molded product after molding. Any collapsible material may be used, and it can be a single material or a mixed material of a plurality of materials, or a composite material. A disintegrating core for molding using various materials such as calcium carbonate (white ink), calcium chloride and silica stone. Therefore, it is possible to obtain the same effect as in the above embodiment.

[0193]

As described above, according to the present invention, a molding method using a pressure-resistant collapse core for molding which uses the pressure-resistant collapse core for molding as a core for molding can further improve the pressure-resistant collapse for molding. By making the core removal method specific,
The idea is to improve productivity and expand the scope of application, and to obtain molded products with excellent quality.
Using a conventional sand core or resin core by molding and using a pressure-resistant collapse core for molding, using a collapsible material such as waste paper that is usually discarded as a raw material Compared with the case, there is a great effect that the material cost can be significantly reduced, and it is used, for example, to form molded products such as cast products, plastic molded products, and ceramic molded products. Among the molding methods using the pressure resistant collapse core for molding, the following excellent effects are obtained in the case of the molding method using the pressure resistant collapse core for molding to obtain a cast product. (1) By using the pressure resistant collapse core for molding, there is an advantage that conditions such as pressure resistance and heat resistance required for the core can be relaxed and the selection range of the core material can be expanded. (2) By using the pressure resistant collapse core for molding, there is an advantage that the pressure resistance and heat resistance of the core can be adjusted by selecting the material and the amount thereof. (3) By using the pressure-resistant collapse core for molding as the core, molding of the core becomes easy, and molding equipment is simplified.
Moreover, there is an advantage that the number of steps is reduced and time and cost can be reduced. (4) Since the molding pressure-resistant collapse core is used as the core,
It will not break even if dropped or thrown, so it will be easy to handle,
There is an advantage that man-hours such as easy transportation and storage are reduced, and time and cost can be reduced. (5) Since the pressure-resistant disintegrating molding core to be used does not contain a permeating component such as a binder, the core component is prevented from permeating into the molded product, so that a defect such as a porosity may occur. It is prevented, defective products of molded products are prevented from occurring, yield is improved,
There is an advantage that productivity can be improved. (6) By using the pressure-resistant collapse core for molding as the core, it becomes easy to form the hollow portion and the undercut portion, and the core strength is improved. There is an advantage that the shape and the whole size can be formed and the applicable range can be expanded. (7) By using a core that has both the pressure resistance during molding and the disintegration property after molding, the occurrence of problems such as molten metal insertion during molding can be avoided and pressure resistance (non-disintegration) can be achieved. Maintaining and facilitating core disintegration after molding and complete removal of core components, prevent adhesion to molded products, and prevent molded product defects such as abrasion and damage of molded products There is an advantage that can be. (8) The pressure-resistant disintegrating core for molding does not contain components that are difficult to remove, such as a binder, and has disintegrating properties after molding, so that the core can be completely removed easily and no pollution occurs. In addition to being able to prevent it, there is an advantage that the number of steps is reduced and the time and cost can be reduced. (9) The pressure-resistant collapse core for molding can be withdrawn from the molded product after molding a part or most of it depending on the shape, and thus the extracted core can be reused without discarding. In addition to the prevention of pollution, the material cost can be reduced by reuse.

The pressure-resistant collapse core for molding used in the molding method using the pressure-resistant collapse core for molding of the present invention has a high heat during molding and residual heat or heat after molding on the surface (outer surface). In the case of forming the coating layer that protects the core body while maintaining the original shape without melting, the following excellent effects are obtained.

(10) The coating layer for protecting the core body so as to wrap it inside prevents the components of the core body from penetrating into the molded product, thereby preventing adverse effects on the molded product. There are advantages that it is possible to prevent the occurrence of defects in the molded product, prevent the defective product from being generated, and improve yield and productivity. (11) In particular, since a coating layer of a predetermined thickness made of synthetic resin such as silicon having excellent heat resistance is integrally formed on the surface of the core body, the core body can be protected so as to be wrapped inside, and molding The shape retention function of the pressure-resistant collapse core for molding at the time of molding is improved, and the initial shape is more reliably retained without melting during molding, resulting in superior dimensional accuracy and better quality of molded products. There is an advantage that can be. (12) In particular, since synthetic resin such as silicon is excellent in flexibility and elasticity, it is possible to form a uniform thickness from thin to thick ones, and medium to large and small ones A coating layer can be formed on the surface of the child body with a predetermined thickness, and even complicated shapes can be easily formed integrally, molding work is easy, and finished products can be obtained easily, and the quality of molded products is even better. There is an advantage that can be done. (13) In particular, since silicon has excellent heat resistance and releasability, it does not adhere to the molded product and melts not only in the molten metal during molding but also in the residual heat and heat after molding. Since the original shape is retained and the core body is protected, molding has a merit that the core can be easily removed after molding, and a finished product with excellent quality can be easily obtained. (14) In particular, the main element of silicon is inorganic silicon (Si).
Therefore, of course, there is no gas generation at the time of molding, even if the core body contains an organic synthetic resin, it retains its original shape without being melted by residual heat or heating after molding as well as during molding. Since the core body is wrapped in a sealed state for protection, gas generation from the core can be completely prevented, adverse effects on the molded product can be prevented, and the quality of the finished product can be improved. (15) In particular, since silicon is excellent in flexibility, elasticity, and releasability, and also has high strength, it can be used as a non-disintegrating core not only for direct punching but also for deformation punching. It is easy to pull out the pressure resistant collapse core for use, and there is an advantage that molding of a molded product can be facilitated.

Furthermore, according to the present invention, the pressure-resistant collapse core for molding used in the molding method using the pressure-resistant collapse core for molding can be removed by removing the part that can be extracted and removing residual heat. The remaining heat can be removed from these areas and almost all of the remaining areas can be removed and dissolved by dissolving with a solvent such as water or burning by heating, so molding is easy regardless of the type or shape of the cast product. There is an excellent effect that the pressure-resistant collapse core for use can be removed.

Even when a molded product is obtained by a molding method such as injection molding adopted as a part of plastic molding, or a molding method such as injection molding adopted as a part of ceramic molding, the molding pressure resistance of the present invention is used. By applying the method for removing the disintegrating core, the pressure-resistant disintegrating core for molding can be easily discharged and removed, and the same effect as the above casting can be exerted, so that the quality is excellent. There is an excellent effect that it can contribute to the efficient production of a desired molded product.

Furthermore, even when a molded product is obtained by a molding method such as injection molding adopted as a part of plastic molding or a molding method such as injection molding adopted as a part of ceramic molding, the molding pressure resistance of the present invention is obtained. There is an advantage that a desired molded product having excellent quality can be efficiently obtained by using the molding method using the sex-disintegrating core.

The productivity can be improved and the range of application can be increased. By using the pressure resistant collapse core for molding, molding of the core can be facilitated and molding equipment can be simplified.
In addition, the number of processes is reduced, time and cost can be reduced, handling is easy, transportation and storage are easy, and pressure adjustment during molding is not required. There are various excellent advantages such as reduction of

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a method of forming a molding die using a pressure-resistant collapse core in a molding method using a pressure-resistant collapse core for molding according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a method for molding a molded product by injecting a molding material among the molding methods using the pressure-resistant collapse core for molding according to one embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a molded product taken out from a molding die in a molding method using a pressure resistant collapse core for molding according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a first embodiment of a pressure-resistant collapse core for molding used in a molding method using the pressure-resistant collapse core for molding of the present invention.

FIG. 5 is a cross-sectional view showing a third embodiment of the molding pressure-resistant collapse core used in the molding method using the molding pressure-resistant collapse core.

FIG. 6 is a cross-sectional view showing a fourth embodiment of a molding pressure-resistant collapse core used in a molding method using the molding pressure-resistant collapse core.

FIG. 7 is a cross-sectional view showing a fifth embodiment of a molding pressure-resistant collapse core used in a molding method using the molding pressure-resistant collapse core.

[Explanation of symbols]

1 Molding pressure-resistant collapse core (pressure-resistant collapse core) 2 Upper mold 3 Lower mold 4 Mold (mold) (plastic mold) (ceramic mold) 5 Cavity 6 Molded product (casting) (plastic molding) Product) (Ceramic molded product) 7 Protective layer (heat resistant protective layer) 8 Covering layer (heat resistant coating layer) H Core body S Filling space F Filling substance

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[Procedure amendment]

[Submission date] October 24, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0130

[Correction method] Change

[Correction content]

Not only these pressure-resistant collapse cores,
Of course, as long as it is disintegratable by a solvent such as water or by heating or cooling , it can be applied to a pressure-resistant disintegrating core made of another material.

Claims (42)

[Claims] 1. A molding tool such as a mold, a plastic molding tool, or a ceramic molding tool is formed by using a pressure-resistant core formed of a collapsible material such as paper, fiber, or grain as the core. Then, a molded product such as a cast product, a plastic molded product, or a ceramic molded product is molded using the molding die, and a molding method using a pressure resistant collapse core for molding. 2. A pressure-resistant core made of a collapsible material is a core having both conditions of non-disintegration such as pressure resistance during molding and disintegration such as disappearance after molding. The molding method using the pressure-resistant collapse core for molding according to claim 1, wherein the core is used for molding. 3. The pressure-resistant core made of a collapsible material is a core made of a paper material such as waste paper, and is molded using the core. Alternatively, a molding method using the pressure-resistant collapse core for molding according to claim 2. 4. A core made of a paper material such as used paper is formed by dispersing the paper material such as used paper through water or the like, press-molding it into a predetermined shape, and then dehydrating and drying it. A molding method using a pressure-resistant collapse core for molding according to claim 3, which is a core and is molded using the core. 5. A pressure-resistant core made of a disintegratable material is a core made of grains such as rice, millet, acne and corn, and is molded using the core. A molding method using the pressure-resistant collapse core for molding according to claim 1 or 2. 6. A core made of grains such as rice is produced by heating grains such as rice, millet, acne and corn together with water to impart viscosity, and then press-molding to form into a predetermined shape. The molding method using a pressure-resistant collapse core for molding according to claim 5, wherein the core is formed by cooling and molding is performed using the core. 7. A pressure-resistant core made of a collapsible material is a core made of a material obtained by mixing a plurality of collapsible materials, and is molded using the core. A molding method using the pressure-resistant collapse core for molding according to claim 1 or 2. 8. A core made of a material obtained by mixing a plurality of collapsible materials is a core made of a paper material such as waste paper and a grain such as rice, and is molded using the core. A molding method using the pressure-resistant collapse core for molding according to claim 7. 9. A pressure-resistant core made of a collapsible material has a filling space formed therein, and the filling space is filled with a heat-resistant filling material such as powder, particles, or lumps. 9. A molding method using a pressure-resistant collapse core for molding according to any one of claims 1 to 8, which is a filled core and is molded using the core. 10. A core made of foundry sand as a filling material,
The molding is performed by using the core.
A molding method using the described pressure-resistant collapse core. 11. The pressure-resistant collapse for molding according to claim 9, wherein the filling material is a core made of resin sand in which a molding sand is mixed with a resin, and the core is used for molding. Molding method using a child. 12. The pressure-resistant collapse core for molding according to claim 9, wherein the filling material is a core made of calcium carbonate (white ink), and the core is used for molding. Molding method. 13. The molding method using a pressure-resistant collapse core for molding according to claim 9, wherein the filling material is a core made of silica stone, and the core is used for molding. 14. The molding method using a pressure-resistant collapse core for molding according to claim 9, wherein the filling material is a core made of metal, and the core is used for molding. 15. The molding pressure resistance according to claim 9, wherein the filling material is a core made of a ceramic such as old ceramics or new ceramics (fine ceramics), and the core is used for molding. Molding method using a sex-disintegrating core. 16. The pressure-resistant core made of a collapsible material is a core having a protective layer formed on the surface thereof, and the core is used for molding. A molding method using the pressure-resistant collapse core for molding according to claim 15. 17. A core comprising a protective layer which satisfies both conditions of non-disintegration such as heat resistance during molding and disintegration such as heat dissipation after molding. The core is used. The molding method using the pressure-resistant collapse core for molding according to claim 16, wherein 18. The pressure-resistant collapse core for molding according to claim 16 or 17, wherein the protective layer is a core made of a heat-resistant protective layer, and the core is used for molding. Molding method using. 19. The pressure-resistant collapse core for molding according to claim 18, wherein the heat-resistant protective layer is a core made of heat-resistant rubber, and the core is used for molding. Molding method. 20. The pressure-resistant collapse core for molding according to claim 18, wherein the heat-resistant protective layer is a core made of a low melting point metal, and the core is used for molding. Molding method. 21. The molding according to claim 18, wherein the heat-resistant protective layer is a core made of a ceramic such as old ceramics or new ceramics (fine ceramics), and the core is used for molding. Molding method using pressure resistant collapsible core. 22. The pressure resistance for molding according to claim 18, wherein the heat-resistant protective layer is a core made of a thermoplastic synthetic resin (thermoplastic), and the core is used for molding. Molding method using disintegrating core. 23. The core, wherein the thermoplastic synthetic resin (thermoplastic plastic) is a heat-resistant synthetic resin (heat-resistant plastic), and molding is performed using the core. Molding method using the pressure-resistant collapse core for molding. 24. The pressure-resistant collapse for molding according to claim 23, wherein the heat-resistant synthetic resin is a core which is a polycarbonate synthetic resin (polycarbonate plastic), and the core is used for molding. Molding method using a child. 25. The heat-resistant synthetic resin is a core which is a fluororesin (polyfluoroethylene resin) such as a tetrafluoroethylene resin, and the core is used for molding. A molding method using the described pressure-resistant collapse core. 26. A pressure-resistant collapse core for molding according to claim 23, wherein the heat-resistant synthetic resin is a core made of a polyimide resin (polyimide plastic), and the core is used for molding. Molding method using. 27. A core in which the heat-resistant synthetic resin is a polyamide-imide resin (polyamide-imide plastic),
The molding is performed by using the core.
A molding method using the pressure-resistant collapse core for molding according to 3. 28. The pressure-resistant collapsible molding core according to claim 23, wherein the heat-resistant synthetic resin is a core made of polysulfone resin (polysulfone plastic), and the core is used for molding. Molding method using. 29. The pressure-resistant collapse core for molding according to claim 23, wherein the heat-resistant synthetic resin is a core made of polyamide resin (nylon resin), and the core is used for molding. Molding method using. 30. The pressure-resistant core made of a collapsible material is a core having a coating layer formed on the surface thereof, and the core is used for molding. A molding method using the pressure-resistant collapse core for molding according to claim 15. 31. A core comprising a core that protects the core without being melted by high heat during molding and residual heat after molding, and the core is used for molding. A molding method using the pressure-resistant collapse core for molding according to claim 30. 32. The pressure-resistant collapse core for molding according to claim 30 or 31, wherein the coating layer is a core made of silicon, and the core is used for molding. The molding method used. 33. A molding method using a pressure-resistant collapse core for molding according to claim 32, wherein the silicon is a core made of a silicone resin, and the core is used for molding. 34. The molding method using a pressure-resistant collapse core for molding according to claim 32, wherein the silicon is a core made of silicon rubber, and the core is used for molding. 35. The pressure-resistant core made of a collapsible material is removed by using a solvent such as water after molding the molded product, according to any one of claims 1 to 34. A molding method using the pressure-resistant collapse core for molding according to claim 1. 36. A solvent is capable of dissolving a pressure-resistant core made of a disintegratable material, and the solvent is used to remove a molded article after molding.
A molding method using the pressure-resistant collapse core for molding according to 5. 37. The pressure-resistant collapse core for molding according to claim 35 or 36, wherein the solvent is water, and the molded product is removed after molding using the water. Molding method. 38. The pressure-resistant collapse core for molding according to claim 35 or 36, wherein the solvent is an organic solvent, and the molded product is removed after molding using the organic solvent. The molding method used. 39. The molding according to any one of claims 1 to 34, wherein the core having a pressure resistance made of a collapsible material is removed by heating the molded product after molding. Molding method using pressure resistant collapsible core. 40. The molding method using a pressure-resistant collapse core for molding according to claim 39, wherein the heat removal is used together with the residual heat removal to remove the molded product after the molding. 41. The molding method using a pressure-resistant collapse core for molding according to claim 39, wherein the removal by heating is used together with the removal of the solvent, whereby the molded product is removed after molding. 42. The method according to claim 39, wherein the heat removal is performed independently, and thereby the molded product is removed after molding.
A molding method using the described pressure-resistant collapse core.