KR20190026152A - manufacturing method for hollow product - Google Patents

Abstract

The present invention relates to a production method of a hollow product, which fills a supporting material in a hollow tube so that the hollow tube can withstand the pressure of molten metal when molding a product, and which prepares a part of a shape of the product into a jig body, connects the hollow tube filled with the supporting material in a cavity inside a mold for forming the shape of the product into the jig body and injects the same, molds a mold product surrounding an outer circumferential surface of the hollow tube by injecting the molten metal into the cavity inside the mold, and removes the supporting material from the interior of the hollow tube after completion of the molding of the product. Therefore, the hollow product satisfying a high yield based on the hollow tube and the supporting material can be produced.

Description

Manufacturing method for hollow product < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing a hollow product, and more particularly, to a method of manufacturing a hollow product by forming a hollow for circulating cooling water passing through a cooling plate inserted between battery packs of a secondary battery, To a method of manufacturing a new hollow product.

Various casting methods (gravity casting, low-pressure casting, high-pressure casting, etc.) and injection molding methods that are applied to the molding of metal or plastic products are intended to make products having hollows therein. Generally, in order to produce a hollow product, upper and lower products having hollows are formed, and then the upper and lower products are adhered using adhesive means. However, in this case, there is a problem that it is difficult to produce a rigid product because of the stiffness problem of the adhesive portion.

Therefore, a hollow tube having a hollow is seated on a mold for producing a product by another conventional method, and the mold is closed. In order to make the shape of the product, the product is formed by supplying the molten metal into the mold. However, even in such a case, there is a problem that the rigidity of the long pipe is limited and the hollow is deformed or broken at high pressure casting.

Therefore, a technique of filling a specific material into a hollow tube having a hollow and then removing the product after molding is also used. However, there is a problem that it is not easy to remove the material for forming the hollow after molding the hollow product.

Conventionally, after a hollow product is made by using a specific tool or apparatus, the hollow forming apparatus used in the tool or apparatus must be removed, which makes it difficult to produce a hollow product, and a specific tool or equipment is required.

The present invention has been developed in order to solve the above-mentioned problems, and an object of the present invention is to provide a hollow product manufacturing method capable of manufacturing a hollow product with high completeness based on a hollow tube and a particulate or soluble substance, To provide a hollow product produced by the method.

In order to achieve this object, the present invention provides, in one aspect, a method for manufacturing a hollow product. The hollow product manufacturing method includes:

One). A hollow tube manufacturing step of manufacturing a tube having a tube diameter corresponding to the hollow of the hollow product and forming the tube corresponding to the hollow shape;

2). Filling a support material inside the hollow tube so that the hollow tube can withstand the melt pressure at the time of product molding;

3). Manufacturing a jig body for supporting and fixing the hollow tube in a cavity of a hollow product molding mold;

4). A mold installing step of coupling the hollow tube to the jig body in a cavity in a hollow product molding mold; And

5). A molding step of putting a molten metal of the same material as the jig body into the cavity to wrap the hollow tube and form a hollow product integrated with the jig body;

And a hollow product filled with a supporting material, which is a dustproof or sound absorbing material, is manufactured in the hollow.

In addition,

6). A supporting material removing step of removing the supporting material filled in the hollow tube after molding the hollow product;

To thereby produce a hollow hollow hollow product.

In the jig body according to the present invention,

And is a shape that forms a part of the body of the hollow product divided. It means a part of the body that forms the body of the molded product after it is fixed by supporting the hollow tube in the cavity.

The jig body includes:

And a jig body made up of a plurality of jig bodies is configured to have a width that is slightly lacking from the original body width so that portions facing each other have a sufficient clearance, And a groove is formed.

In this case, when the jig body is installed, it is preferable to further form an injection groove so that the molten metal can be easily injected into the hollow tube and integrated into one body.

The jig body includes:

The jig body after the molding can be integrated into a part of the body by constituting the same material as the material of the hollow product. Of course, it can be made of different material, and the jig body and other parts after molding can be made into different materials.

The supporting material may be,

Wherein the support tube is made of a water-soluble material that dissolves in water, water is injected into the hollow tube after the product is formed, the support material inside the hollow tube is melted by the water to empty the hollow tube, And the hollow tube hollowed out is embedded in the inside to form a hollow product.

The supporting material is composed of a salt, and when the water is injected into the hollow tube, the supporting material is melted and removed by the water.

The hollow pipe may be made of the same metal as the molten metal, and the hollow pipe may be formed integrally with the hollow product, and then the support material may be removed from the hollow pipe.

The present invention also provides a hollow product produced by the above-mentioned production method. A method of manufacturing a hollow tube, comprising the steps of: forming and forming a hollow tube; filling a support material into a tube for hollow; fabricating a part of the product body into a jig body; Aligning and fixing the jig body and the hollow tube in the cavity of the mold (mold); Injecting a liquid molding material into the cavity to form a hollow product having a hollow therein; The hollow product is characterized in that a hollow product filled with a hollow cavity is prepared without removing the supporting material after the molding, or a supporting material is removed to produce a hollow hollow hollow product.

In the hollow product manufacturing method of the present invention, a hollow tube is filled with a salt (salt), and then a hollow tube is inserted into a cavity inside the mold. A part of the body is divided, (A liquid raw material for forming a product) is injected into the cavity of the mold and hardened, thereby making a molded product in which the hollow tube is buried. It is also possible to provide a hollow hollow hollow product by removing the support material of the hollow tube after molding. Accordingly, since the hollow tube is fixedly supported in the cavity by using the jig body, it is possible to form hollow products in a precise arrangement without distorting or deforming the alignment state when the melt is injected, When used, the supporting material can be easily removed by using water after molding, and workability is improved. Therefore, it is not necessary to make a hollow product by using a specific tool or apparatus, and there is no need to remove a hollow forming apparatus used for a tool or apparatus. Therefore, when a hollow product is simple to manufacture and a specific tool or equipment is required .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process explanatory view for explaining a hollow product manufacturing method according to the present invention; FIG.
2 is a perspective view showing an example of a hollow tube used in the hollow product manufacturing method according to the present invention.
FIG. 3 is a perspective view showing a state in which an inlet of a hollow tube is capped with a support material filled in the hollow tube of FIG. 2; FIG.
Fig. 4 is a perspective view showing a state in which the hollow tube shown in Fig. 3 is put into a cavity inside the mold. Fig.
Fig. 5 is a side sectional view showing the hollow tube being supported by the jig body in the cavity of the mold shown in Fig. 4. Fig.
6 is a perspective view showing an example of a hollow product molded by the hollow product manufacturing method of the present invention.
7 (a) and 7 (b) are explanatory diagrams for explaining a jig body according to the present invention, and for explaining the manufacture and installation of a hollow product jig body of another structure.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description. The same reference numerals are used for the same parts in the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process explanatory diagram for explaining a hollow product manufacturing method according to the present invention; FIG. Referring to the drawings, the hollow product manufacturing method of the present invention comprises:

One). (10) a hollow tube (10) for forming a tube having a pipe diameter corresponding to the hollow of the hollow product and forming the pipe corresponding to the hollow shape;

2). (S20) filling the support material (20) inside the hollow tube (10) so that the hollow tube (10) can withstand the melt pressure at the time of product molding;

3). (S30) a jig body (100) for supporting and fixing the hollow tube (10) in the cavity (4C) of the hollow product molding mold (4);

4). A mold installation step (S40) for assembling the hollow tube (10) to the jig body (100) in the cavity (4C) in the hollow product molding mold (4);

5). A molding step S50 for molding a hollow product 8 to be integrated with the jig body 100 by inserting a molten metal of the same material as the jig body 100 into the cavity 4C and surrounding the hollow tube 10, );

To thereby produce a hollow product in which the supporting material 20 is filled in the hollow.

Also, 6). A supporting material removing step (S60) of removing the supporting material (20) filled in the hollow tube (10) after molding the hollow product (8);

To thereby produce hollow hollow hollow products.

According to an embodiment of the present invention,

One). The step (S10) of manufacturing the hollow tube (10) in which the tube having the pipe diameter corresponding to the hollow of the hollow product is formed and correspondingly forming the hollow shape can be implemented in a plurality of embodiments.

For example, the hollow pipe 10 may be manufactured by manufacturing a metal pipe having the same inner diameter as the hollow of the hollow product, forming a single metal pipe corresponding to the hollow shape of the hollow product to manufacture the hollow pipe 10 have. Alternatively, a metal pipe may be manufactured and cut to fit the designed length, and then bent to form a curved pipe. Then, the curved pipe and the straight pipe are connected to each other, and the pipe is assembled and assembled to produce a hollow pipe such as a hollow pipe in a hollow product. That is, it can be manufactured by bending a single pipe according to a hollow shape, or bending and forming a plurality of pipes, and connecting the banding pipe and the straight pipe or assembling them together.

FIG. 2 is a perspective view showing an example of a hollow tube used in the method of manufacturing a hollow product according to the present invention, FIG. 3 is a cross-sectional view illustrating a state in which a hollow tube is filled with a supporting material, FIG.

After the hollow tube 10 corresponding to the hollow of the hollow product is manufactured as described above,

2). The supporting material 20 is charged into the hollow tube 10 so that the hollow tube 10 can withstand the pressure of the molten metal at the time of product molding.

In step S20 of filling the supporting material 20, the support material 20 is filled in the tube to prevent the hollow tube 10 from being deformed when the molten metal is injected under pressure.

The supporting material 20 to be filled in the hollow tube 10 may be a water-soluble material which is soluble in water. In this case, when water is injected into the hollow tube 10 after molding the hollow product, the support material 20 inside the hollow tube 10 is dissolved by water to empty the hollow tube 10 , A hollow tube (10) in which the supporting material (20) is emptied is embedded in the inside, and a hollow product can be formed.

For example, the water-soluble support material 20 may be composed of a salt. In this case, when water is injected into the hollow tube 10, the salt may be dissolved by water. At this time, when the hollow tube 10 is made of aluminum and the molten metal is also a hot molten aluminum solution, the melting temperature of the salt is higher than the melting temperature of the aluminum, so that a part of the surface of the hollow tube 10 is melted and molded , The salt remains in its shape so that the hollow tube 10 can withstand the injection pressure of the molten metal.

The hollow tube 10 is prevented from being crushed by the injection pressure of the molten metal. The molten metal and the hollow tube 10 are integrated with each other while the hollow tube 10 is supported by the salt, and at the same time, the hollow product having the hollow interior is formed by the hollow tube 10.

After filling the hollow tube 10 with the supporting material 20, the cap 12 is connected to both ends of the hollow tube 10 to prevent the filled supporting material 20 from leaking. So as to prevent the support material 20 from leaking.

FIG. 4 is a perspective view showing a state in which the hollow tube shown in FIG. 3 is inserted into a cavity inside the mold, and FIG. 5 is a side sectional view of FIG.

After the hollow tube 10 is formed to correspond to the hollow to fill the supporting material 20, the hollow tube 10 is placed in the cavity 4C in the mold 4 as shown in Figs. 4 and 5, and the molten metal is injected and molded. That is, when the molten metal is injected into the cavity 4C, the hollow product is molded into the integrated body while enclosing the hollow tube 10.

At this time, when the hollow tube 10 is installed in the cavity 4C in the mold 4, both ends of the hollow tube 10 are pulled out of the cavity 4C and fixed and supported by the mold. However, in the space inside the cavity 4C, it is supported only by fixing both end-ends of the hollow tube 10 without means to be supported. Therefore, when the molten metal is pressurized and injected, the hollow tube 10 at the portion floating in the space may be displaced from the aligned position by the molten metal to be injected, and the forming mode of the hollow tube may be deformed.

5 is a side cross-sectional view showing the hollow tube being supported by the jig body in the cavity in the mold shown in FIG.

3). The step S30 of manufacturing the jig body 100 for supporting and fixing the hollow tube 10 in the cavity 4C of the hollow product molding mold 4 may be performed by using the same material as the hollow body The body part is made in advance.

 Since the hollow tube 10 exists in the hollow product body, it can not be provided with a separate jig since it is installed in the cavity in the space. Accordingly, in the present invention, the jig body 100, which supports the hollow tube 10 inside the cavity 4C and can be integrated with the hollow product body, is manufactured and used as a jig. A part of the hollow product body is previously made of the jig body (100).

The jig body 100 may be either a structure for providing qkeu of the hollow vessel 10 in a space inside the cavity or an inner body or an outer body divided around the hollow vessel, It is also possible to manufacture at least one or more jig bodies by dividing the body into a plurality of pieces. This can be designed to prevent deformation and position fixation considering the shape and size of the hollow tube.

4). The mold installation step S40 is performed in which the hollow tube 10 is coupled to the jig body 100 in the cavity 4C in the hollow product molding mold 4. [

As shown in FIG. 5, the hollow body 10 is installed in the cavity 4C by joining the jig body 100 with the hollow vessel 10 in advance. That is, the hollow hollow tube 10 is coupled to the cavity 4C so as to be supported by the jig body 100 manufactured in advance in the space, and is installed in the cavity.

5). A molding step S50 for molding a hollow product 8 to be integrated with the jig body 100 by inserting a molten metal of the same material as the jig body 100 into the cavity 4C and surrounding the hollow tube 10, 4 and 5, after the hollow tube 10 and the jig body 100 are provided in the cavity, the molten metal is injected and molded.

Since the jig body 100 is made of the same material as the molten metal, when the molten metal is injected into the jig body 100, the jig body 100 is integrated with the molten metal to form a single body and is molded while surrounding the hollow tube 10. Of course, when the hollow tube 10 is made of the same material, the surface is melted and integrated with the body.

In addition, the jig body may be made of a material different from that of the remaining body portion by constituting the jig body from materials different from the material of the molten metal according to the characteristics of the hollow product. That is, when a part of the body is made of metal as a jig body and a liquid plastic material is injected instead of the molten metal, the jig body and the remaining part can be made of different materials. Such a composite structure can be applied to a special purpose product.

6 is a perspective view showing an example of a hollow product formed by the hollow product manufacturing method of the present invention.

After completion of the molding, the hollow product may be manufactured by finishing the inlet of the hollow tube 10 drawn out of the cavity, and the supporting material may be manufactured as a hollow product which is heavy in the hollow. Alternatively, Hollow hollow products.

The hollow product filled with the supporting material 20 in the hollow is filled with a dustproof or sound absorbing material in advance in the hollow tube 10 in manufacturing a hollow product such as a wheel assembly that fills the hollow of the hollow product with a dustproof or sound absorbing material .

This is because, after molding the hollow product, the method of separately filling the hollow with dustproof or sound absorbing material is performed by filling the support material to prevent deformation of the hollow tube during the injection of the molten metal and molding the hollow product, Since the sound absorbing material must be filled with the hollow of the hollow product, the workability is reduced. Accordingly, in the present invention, the hollow pipe 10 is filled with the dust-proof or sound-absorbing material as the supporting material 20 and molded in a filled state. Here, the hollow pipe 10 may be made of the same material as or different from the hollow product.

Meanwhile, hollow hollow hollow products are manufactured as a hollow product using a hollow as a channel for flowing a fluid such as cooling water. For this purpose, the supporting material 20 filled in the hollow pipe 10 must be removed. The hollow of a hollow product may be a simple straight line, but it may include a curve and a long line. In this case, the work of removing the support material is time-consuming and difficult to completely remove. For this purpose, it is effective to use a support material which dissolves in water (not limited to water but a solution for melting the support material).

That is, the support material 20 is filled with salt (salt) in the hollow tube 10 to support the tube, and the formed salt is dissolved in water to remove the salt.

After the hollow product is formed by injecting the molten metal in the state that the hollow tube 10 is supported by the salt, the cap 12 connected to the inlet of the hollow tube 10 is taken out, 10) to dissolve the salt, the salt can be removed from the hollow tube (10).

Further, in the hollow product manufacturing method of the present invention, after the molding of the hollow product 8 is completed, the following method is used to effectively remove the soluble substance remaining in the hollow tube 10 buried in the product .

The molten metal is injected into the cavity of the mold 4 under a predetermined pressure in a state where the hollow tube 10 is filled with the salt and then the hollow tube 10 is put in the cavity of the mold 4, (10) and a molten preliminary hollow product (8) are formed. At this time, the mold 4 may be constituted of the upper mold 4A and the lower mold 4B, and the hollow product 8 (8A) may be formed in the mold 4 in a state where the upper mold 4A and the lower mold 4B are engaged. A cavity for molding is formed.

The molten metal is injected into the cavity of the mold 4 in a state where the inside of the hollow tube 10 is filled with salt and the hollow tube 10 is put into the cavity inside the product molding mold 4 It is to make the appearance of the product. Then, when a predetermined pressure of water is injected into the hollow tube 10, the water is dissolved in the salt, so that the salt is removed. When the salt is removed, the hollow tube 10 is embedded in the hollow tube The hollow product 8 having a hollow inside can be formed by the hollow member 10.

According to another embodiment of the present invention, the supporting material 20 may be made of a particulate material having a strength capable of holding the hollow tube 10 against the injection pressure of the molten metal. In the hollow tube 10, A hollow may be formed inside the product, and then the supporting material 20 may be removed from the hollow tube 10. At this time, the particulate matter may be composed of a material having a higher melting temperature than the melting temperature of the high temperature and hollow tube 10, such as ceramic, sand, balls (metal balls, i.e., steel ball).

As described above, when the hollow tube 10 is aluminum and the molten metal is also a hot molten aluminum melt, the melting temperature of the particulate support material 20 (particulate matter) made of ceramics or steel balls is higher than the melting temperature of aluminum, A part of the pipe 10 is melted and formed into a single piece with the molten metal while the granular material 20 is kept in the shape so that the hollow pipe 10 can withstand the injection pressure of the molten metal. The hollow tube 10 is prevented from being crushed by the injection pressure of the molten metal. The hollow pipe 10 is integrated with the molten metal in the state that the hollow pipe 10 is supported by the granular supporting material 20 and at the same time the hollow pipe having the hollow inside is formed by the hollow pipe 10 .

After the molten metal is injected in the state where the hollow tube 10 is supported by the granular supporting material 20 and the hollow product is molded, the cap 12, which is coupled to the inlet of the hollow tube 10, , The particulate supporting material 20 can be removed from the inside of the hollow tube 10 and removed. If necessary, pressure water of a predetermined pressure may be injected into the hollow tube 10 to remove the particulate support material 20 by the injection pressure of water.

The mold 4 may be constructed by coupling the upper mold 4A and the lower mold 4B so that the cap 12 coupled to the hollow tube 10 is inserted into the cavity A half cap 12 is provided in the upper mold 4A and the lower mold 4B so that the cap 12 is accommodated in the groove of the cap 12 formed by the half cap 12, Only the hollow tube 10 is put into the cavity of the mold 4 and then the molten metal is injected into the cavity of the mold 4 to form the hollow product.

Then, the cap 12 is exposed to the outside of the hollow product, so that the cap 12 can be removed from the hollow tube 10. When the cap 12 is removed from the hollow tube 10 and the salt is filled in the hollow tube 10, water is injected to dissolve and remove the salt, and particulate matter such as ceramics or steel balls If the material is filled, the cap 12 may be removed and the particulate matter may be removed from the hollow tube 10 to remove it.

The hollow tube 10 is made of the same metal as the molten metal so that the hollow tube 10 is integrally formed with the hollow product 8 and then supported in the hollow tube 10 So that the material 20 is removed. As described above, the hollow tube 10 and the molten metal may be made of aluminum.

In the present invention, the hollow tube (10) is formed into a continuous loop tube so that one end of the hollow tube (10) serves as an inlet and the other end serves as an outlet, As shown in FIG.

6, that is, the hollow inside the hollow product 8 includes a plurality of parallel hollow portions 10A, a plurality of connecting hollow portions 10B connecting parallel parallel hollow portions 10A, (The curved connecting hollow portion 10B).

The hollow tube 10 may be formed into a loop-like hollow tube 10 continuous in a staggered fashion and formed into a looped hollow in which the hollow is continuous in a staggered manner.

When the hollow pipe 10 is formed in a zigzag pipe shape like a hot water pipe of a boiler buried in a floor, a plurality of parallel hollow portions 10A and a parallel hollow portion 10A, A hollow having a plurality of connecting hollow portions 10B connecting the connecting hollow portions 10B may be formed.

In this case, the hollow tube 10 used in the present invention is a hollow tube having a zigzag coil shape as described above. However, in addition to the zigzag coil type hollow tube 10, the hollow tube 10, like the hollow tube 10, It is to be understood that the hollow tube 10 can be used as long as it can form a hollow inside the hollow tube 10.

In the meantime, the hollow product 8 to be molded in the present invention may be employed as a cooling plate interposed between battery packs of the secondary battery. In this case, the cooling water is circulated in the hollow inside the hollow product 8, The battery pack of the battery can be cooled.

Of course, the hollow product 8 manufactured in the present invention can be utilized as various hollow products 8 in addition to the cooling plate.

7 (a) and 7 (b) are explanatory diagrams for manufacturing and installing a hollow product jig body having a different structure for explaining a jig body according to the present invention.

As shown in the figure, an example of a hollow product having a structure different from that of the hollow product having the structure as shown in FIGS. 1 to 6 will be described as an example of a hollow product having a spiral hollow structure inside the cylindrical structure. In this case, when the hollow tube 10 having a spiral structure is formed and the support material 20 is filled in the cavity 4C and then installed in the cavity 4C, the position of the hollow vessel 10 can be changed by the pressure during the injection of the molten metal , A deformation of the distance between the tube and the tube may occur.

In order to prevent this, a part of the hollow body of the hollow product is previously divided into areas such as (A) in FIG. At least one jig body 100 may be manufactured, but a plurality of jig bodies 100 may be manufactured for each position. The body of the inner part or the outer part can be formed into a jig body by being divided around the hollow. Considering the shape and size of the hollow tube, the jig body is pre-fabricated in a number or structure that can be stably supported.

Although not shown in detail in the drawing, the jig body 20 can be constituted by one or a plurality of, or a pair or a plurality of pairs, and the jig body 20 constituting a pair can have sufficient clearance It is preferable to form a molten metal injection space and path so that the molten metal injection groove is formed on the support surface of the jig body.

Accordingly, when two pieces of jig bodies are manufactured as shown in (b) of FIG. 7, since the hollow tubes are supported at at least two places, the position of the hollow tubes can not be adjusted even if a pressurized melt is injected, And the like. At this time, since the jig body 100 is made of the same material as the molten metal, it can be integrated into one body while melting the molten metal.

The foregoing has described specific embodiments of the present invention. It is to be understood, however, that the scope and spirit of the present invention is not limited to these specific embodiments, and that various modifications and changes may be made without departing from the scope of the present invention. If you are a person, you will understand. In particular, in the description of the present invention, a metal product is taken as an example by exemplifying a molten metal and a metal pipe, but the present invention is not limited thereto, and can also be applied to the manufacture of a hollow product of metal and other materials (e.g., resin) by the same method.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

4: Mold (mold) 4A: Upper mold
4B: Lower mold 8: hollow product
10: Hollow tube 10A: Parallel hollow tube
10B: connecting hollow part 12: cap
20: support material 100: jig body

Claims (12)

One). (10) a hollow tube (10) for forming a tube having a pipe diameter corresponding to the hollow of the hollow product and forming the pipe corresponding to the hollow shape;
2). (S20) filling the support material (20) inside the hollow tube (10) so that the hollow tube (10) can withstand the pressure of the liquid body material when molding the product;
3). (S30) a jig body (100) for supporting and fixing the hollow tube (10) in the cavity (4C) of the hollow product molding mold (4);
4). A mold installation step (S40) for assembling the hollow tube (10) to the jig body (100) in the cavity (4C) in the hollow product molding mold (4); And
5). A molding step S50 for molding a hollow product to be integrated with the jig body 100 by inserting a liquid body material of the same material as the jig body 100 into the cavity 4C and wrapping the hollow tube 10, );
≪ / RTI >
The method of manufacturing a hollow product according to claim 1,
6). A supporting material removing step (S60) of removing the supporting material (20) filled in the hollow tube (10) after molding the hollow product (8);
≪ / RTI >
The jig body (100) according to claim 1 or 2, wherein the jig body (100)
Wherein the shape of the hollow product is a shape that forms a part of the body of the hollow product divided.
The jig body (100) according to claim 1 or 2, wherein the jig body (100)
One or a plurality of them,
Wherein the plurality of jig bodies (100) are configured to have a width that is partially lacking in the original body width so that the portions facing each other have a sufficient clearance.
The jig body (100) according to claim 1 or 2, wherein the jig body (100)
Wherein an injection groove for injecting a liquid body material is formed on a supporting surface of a jig body for supporting the hollow tube (10).
The jig body (100) according to claim 1 or 2, wherein the jig body (100)
Wherein the hollow member is made of the same material as the hollow member.
3. The method according to claim 1 or 2, wherein the support material (20)
Wherein the dustproof or sound absorbing material is packed in the hollow tube (10), and the product is made in a state of being filled in the hollow without removing the supporting material (20) after molding.
3. The apparatus of claim 2, wherein the support material (20)
(20) of the hollow tube (10) is melted by the water by injecting water into the hollow tube (10) after the molding of the product, so that the hollow Wherein the hollow tube (10) is emptied and the hollow tube (10) in which the support material (20) is emptied is embedded in the hollow tube (10) to form a hollow product.
The method according to claim 1,
Wherein the support material (20) is composed of a salt, and when the water is introduced into the hollow tube (10), the support material (20) is melted and removed by the water.
The method according to claim 1,
The hollow tube 10 is made of the same metal as the molten metal so that the hollow tube 10 is formed integrally with the hollow product 8, To remove the support material (20).
The jig body (100) according to claim 1, wherein the jig body (100)
Wherein the hollow product is made of a material different from the material forming the product body of the hollow product.
A hollow article produced by the method of any one of claims 1 to 11.

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