JPH06335914A - Molding method and molding apparatus for cylindrical molded body - Google Patents

Abstract

(57) [Summary] [Object] To provide a means capable of improving workability during molding of a tubular molded body by shortening the time until the demolding of the tubular molded body from the conventional one. [Structure] The centrifugal molding die 1 is rotated while being heated by a heating means H, and a ceramic slurry or fluid powder or a synthetic resin slurry or fluid powder is introduced into the rotating centrifugal molding die 1. Granules are injected and a ceramic or synthetic resin compact is centrifugally molded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a cylindrical molded body of ceramics or synthetic resin, and an apparatus used for carrying out the method.

[0002]

2. Description of the Related Art As a method of molding a tubular molded body (particularly, a ceramic cylindrical molded body), a centrifugal molding die is rotated at room temperature, and the tubular molded body is put into the rotating centrifugal molding die. A method of injecting an aqueous slurry for forming and centrifugally molding the tubular molded body is considered as a general method.

[0003]

When the tubular molded body is molded by using such a conventional method, it is necessary to remove the tubular molded body from the centrifugal molding die in the centrifugal molding die. By naturally drying the molded tubular molded body,
Since it was designed to harden the ceramic molded body by sufficiently removing the dispersion medium such as water, which is difficult to quickly remove from the cylindrical molded body, over a long period of time, it is necessary to dry and cure the ceramic molded body. There is a problem that a process is required and the workability is poor. The present invention has been made by paying attention to such an actual situation, and by shortening the time until the demolding of the tubular molded body as compared with the conventional case, the workability improvement in the steps up to the demolding is improved. Its main purpose is to provide a possible means.

[0004]

A method for molding a tubular molded body according to the present invention (hereinafter simply referred to as the method of the present invention) is such that a centrifugal mold is rotated while being heated, and the centrifugal mold is rotated into the rotating centrifugal mold. , Ceramics slurry or fluid powder,
Alternatively, it is characterized by injecting a slurry or fluid powder of synthetic resin and centrifugally molding a ceramic or synthetic resin molded body.

The characteristic configuration of the molding apparatus for a cylindrical molded body according to the present invention (hereinafter, simply referred to as the apparatus of the present invention) is a ceramic slurry or fluid powder or synthetic resin slurry or fluid powder. Is provided with a centrifugal mold which can be freely injected, a driving means for rotationally driving the centrifugal mold, and a heating means for heating the centrifugal mold.

It is more preferable that the heating means is movable in the longitudinal direction of the centrifugal molding die.

[0007]

When a tubular molded body is molded using the method of the present invention having the above characteristics, the centrifugal molding die for centrifugally molding the cylindrical molded body is heated.
It becomes possible to forcibly dry and cure the tubular molded body molded in the centrifugal molding die. Therefore, when removing the tubular molded body from the centrifugal molding die, sufficient removal of the dispersion medium such as water, which was conventionally difficult to remove quickly, can be performed faster than the conventional one by the forced drying and curing. This is realized, and thus the drying / curing time until the demolding is shortened.

[0008]

As described above, according to the method of the present invention, when the tubular molded body is centrifugally molded, the drying / curing time until the mold releasing of the tubular molded body is shortened as compared with the conventional case. As a result, workability in the process is improved as compared with the conventional one, and the main object of the present invention is achieved.
Moreover, depending on the material of the tubular molded body or the molding conditions, not only the drying and curing, but also the firing of the tubular molded body may be possible based on the mold heating in the molding process, In this case, it is possible to improve workability in a series of steps including the baking in addition to the drying / curing.

Further, according to the device of the present invention having the above-mentioned characteristic structure, the method of the present invention which achieves the above-mentioned operations and effects can be effectively carried out.

The heating means in the device of the present invention is
When the centrifugal molding die is configured to be movable in the longitudinal direction, the heating means can be appropriately moved to perform the drying / curing or the firing particularly strongly in a part of the longitudinal direction. Therefore, when the apparatus of the present invention having the movable heating means is used, the quality of the baked product may be changed in the longitudinal direction by performing the drying / curing or baking particularly strongly in a part of the longitudinal direction. Further, it is possible to prevent the occurrence of cracks at the end of the molded product, which easily occurs when the end of the molded product is quickly dried.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a centrifugal molding die (one embodiment of the device of the present invention) used for carrying out the method of the present invention (more specifically, the method of the present invention for centrifugally molding a cylindrical ceramic molded body). .

In the figure, numeral 11 is an outer frame of the centrifugal molding die 1, and the centrifugal molding die 1 is fitted in a central portion of the outer frame 11. Engagement protrusions 11a and 11b are provided on the outer peripheral surface of the outer frame 11 so as to protrude therefrom.
The outer frames 11 in which the centrifugal molding die 1 is fitted are engaged with the support rollers 2 and 3 which are rotationally driven by a driving device (not shown) so that the outer frame 11 has the shafts thereof. It is rotatably supported while being positioned in the direction, and is rotated according to the rotation of the support rollers 2 and 3.

The centrifugal molding die 1 is formed with openings at both ends thereof that can function as a slurry injecting portion. The openings prevent the injection slurry from flowing out of the die during centrifugal molding. Therefore, side lids 4 and 5 with central holes 4a and 5a for blocking the lateral flow of the injected slurry are attached.

On the side of the centrifugal mold 1 (on the left side in FIG. 1), a slurry pouring trough is arranged so that a tip opening 6a faces the inside of the centrifugal mold 1 through a central hole 4a of the side lid 4. 6 is provided.

A heating means H for heating the centrifugal molding die 1 is provided around the outer frame 11 so as to correspond to an inner fitting portion of the centrifugal molding die 1 in the outer frame 11. More specifically, the heating means H includes the outer frame 11
On the other hand, the electric heater 13 is housed in a casing 12 that is loosely fitted so as not to hinder the rotation of the outer frame 11, and is wound so that the entire length thereof substantially corresponds to the length of the centrifugal molding die 1. Is configured.

When the method of the present invention is carried out by using the apparatus of the present invention having the above-mentioned structure (that is, when a cylindrical ceramic molded body is centrifugally molded), first, the centrifugal molding die 1 is heated by the heating means H. The slurry is rotated, and the slurry is injected into the rotating centrifugal molding die 1 via the slurry injection gutter 6. Then, after the ceramic molded body is centrifugally molded, the ceramic molded body is dried and cured, and the ceramic molded body is released from the centrifugal molding die 1. In the present embodiment, the ceramic molded body is centrifugally molded. Since the centrifugal molding die 1 is heated by the heating means H, the ceramic molded body molded in the centrifugal molding die 1 is forcibly dried and hardened based on the heating. Therefore, when the ceramic molded body is released from the centrifugal molding die 1, sufficient removal of the dispersion medium such as water, which has been difficult to remove in the past, can be realized more quickly by the forced drying and curing. As a result, the drying / curing time until the demolding is shortened. Moreover, depending on the material of the tubular molded body or the molding conditions, not only the drying and curing but also the burning of the tubular molded body may be possible based on the mold heating in the molding process.

Next, another embodiment will be described. As the heating means H, as shown in FIG. 2, a rod-shaped heater 14 that can be inserted into and removed from the centrifugal molding die 1 may be used.

In the above embodiment, the ceramic slurry was poured into the centrifugal molding die 1. However, the fluidity obtained by pulverizing the ceramic material until it becomes fluid is provided. An embodiment in which the cylindrical molded body is molded by injecting the powdery or granular material into the centrifugal molding die 1 and subjecting the fluid powdery or granular material to the centrifugal molding with the heating is also conceivable.

Further, the ceramics in the above-mentioned embodiments are ceramics in a broad sense, and the ceramics include glass and the like. That is, according to the method of the present invention, it is possible to centrifuge a tubular molded body of glass.

The present invention can also be applied to the case of manufacturing a cylindrical synthetic resin molding. That is, a synthetic resin slurry in which colloidal particles of a synthetic resin are appropriately dispersed in a dispersion medium, or a fluid granular material obtained by granulating a synthetic resin material until it has fluidity is placed in the centrifugal molding die 1. It is also conceivable that an embodiment in which the tubular molded body is molded by injecting into the above and subjecting the fluid powdery granules to centrifugal molding accompanied by the heating.

Further, in the slurry injecting process for producing the cylindrical synthetic resin molded body, if a reinforcing material such as glass fiber is dispersed in the slurry, high quality reinforced by the reinforcing material such as glass fiber is obtained. Thus, the synthetic resin molded body can be obtained.

Further, in the case of manufacturing the cylindrical synthetic resin molded body, the fluid powdery granules used in the injection process are mixed with crushed powder of plastic and crushed powder of wood chips, paraffin or the like. If it is made of powder, crushed powder such as wood chips and paraffin is selectively scattered and removed by the heating, and a porous synthetic resin molded body can be obtained.

The heating means H in the above embodiment
It is also possible to consider an embodiment in which is configured to be movable in the longitudinal direction of the centrifugal molding die 1. For example, the electric heater 13 shown in FIG.
May be configured to be movable in the longitudinal direction together with the casing 12 while shortening the overall length, and the one end holding portion of the rod-shaped heater 14 shown in FIG. May be movable in the longitudinal direction. In this embodiment, the heating means H can be appropriately moved to perform the drying / curing or the firing particularly strongly in a part of the longitudinal direction. Therefore, according to the apparatus of the present invention provided with the movable heating means, the quality of the fired product can be changed in the longitudinal direction by performing the drying / curing or firing particularly strongly in a part of the longitudinal direction, It is possible to prevent the occurrence of cracks at the end of the molded product, which easily occurs when the end of the product is quickly dried.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the device of the present invention.

FIG. 2 is a vertical sectional view showing another embodiment of the device of the present invention.

[Explanation of symbols]

 1 Centrifugal mold H heating means

Claims (3)

[Claims] 1. A centrifugal molding die (1) is rotated while being heated, and a slurry or fluid powder of ceramics or a slurry or fluidity of synthetic resin is introduced into the rotating centrifugal molding die (1). A method for molding a tubular molded body, which comprises injecting a powder or granular material to centrifugally mold a ceramic or synthetic resin molded body. 2. A centrifugal molding die (1) into which a ceramic slurry or fluid powder or synthetic resin slurry or fluid powder can be poured, and the centrifugal molding die (1) is rotationally driven. A molding device for a tubular molded body, comprising a driving means and a heating means (H) for heating the centrifugal molding die (1). 3. The heating means (H) is configured to be movable in the longitudinal direction of the centrifugal molding die (1).
A molding device for the cylindrical molded body described.