JPH05220722A - Manufacture and device for molded body of complicated shape - Google Patents

Abstract

PURPOSE:To provide the manufacturing method and its device for molded bodies of complicated shape to be manufactured in mass production at a time and at low cost, which cannot be achieved by the extrusion molding or injection molding heretofore available CONSTITUTION:In the manufacturing method for molding a powdery mixture by means of a molding machine with a drawing mechanism, a molding body of complicated shape is manufactured into a desired shape by means of a molding section with mold structure formed on the end of a molding machine of a molding device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing method and apparatus for compressing a powder mixture into a compact.

[0002]

2. Description of the Related Art Extrusion molding has been widely used as one of methods for forming a powder mixture into a molded body. In this method, a powder mixture and a binder made of cellulose, etc. are dispersed with a liquid such as water, and then kneaded into a clay-like material, which is then compressed by a molding machine having a squeezing mechanism and then transferred from the tip of this molding machine to the outside of the device. It is a method of continuously molding a molded product having the same cross-sectional shape by extrusion.

However, as a shape which can be manufactured by using this method, as shown in FIG. 4, a cylindrical shape such as a round bar (FIG. 4a) and a cylindrical shape such as a circular tube (FIG. 4).
b), or a honeycomb tube which is a cylinder having a mesh structure (FIG. 4c), and a simple shape such as a polygonal columnar shape or a plate-like shape, particularly a columnar shape, was obtained.

Therefore, in order to obtain a molded product having a complicated shape, it cannot be obtained unless the molded product having a simple shape close to that is molded by extrusion and then ground and polished into a desired shape. It was

Another method is an injection molding method in which a mold (female mold) having a desired shape is prepared in advance and the powder kneaded product is injected into the mold to mold the mold. However, this method is suitable for mass production, but it is disadvantageous for high-mix low-volume production because the die cost is expensive.

[0006]

As described above, conventional extrusion molding or injection molding cannot produce a molded product having a complicated shape at low cost in a large variety of products.

In view of the above problems, the present invention improves a conventional molding machine capable of molding a molded article having a complicated shape at a time without the need for post-processing such as grinding. By doing so, it is an object of the present invention to provide a manufacturing method and an apparatus therefor, which realizes cost reduction.

[0008]

A method for producing a complex-shaped molded article according to the present invention is a method for producing a molded article by molding a powder kneaded material with a molding machine having a squeezing mechanism. It is characterized in that it is molded into a target shape by a molding part having a provided mold structure, and the apparatus for producing a complex-shaped molded product of the present invention is a molded product obtained by molding a powder kneaded product with a molding machine having a squeezing mechanism. In the manufacturing apparatus for manufacturing, a molding section having a mold structure corresponding to a target shape is provided at the tip of the molding machine. The above means will be described below with reference to the drawings.

Conventionally, an extrusion molding machine has been widely used as a molding machine having a squeezing mechanism. However, the present invention is not limited to this, and may be any device capable of producing a molded body such as a column or a polygonal column. The tip portion 2 of this molding machine is a molding portion having a mold structure corresponding to the target shape as shown in FIG. 2, and a columnar molded body can be molded by extruding this. That is, what attaches the molding die 3 having a structure (mold structure) as shown in FIG. 3 to the tip portion 2 of the molding machine as shown in FIG. 2 is a characteristic portion of the manufacturing apparatus of the present invention. It is FIG. FIG. 1 is an enlarged schematic view showing the vicinity of the tip 2 of the manufacturing apparatus of the present invention. The tip 2 formed by the mouthpiece 1 has a simple shape, for example, a rectangle, and is slidably contacted thereto. The mold 3 is attached as shown in FIG. The material of the molding die 3 is not particularly limited, but plastics, metals and the like which are generally used as a die can be used in the present invention. The powder kneaded material and the binder are dispersed and kneaded in a liquid toward the tip portion 2 having such a configuration, and the molding composition 4 which is a clay-like composition is compressed. As a result, the molding composition 4 is also filled in the mold part 5. The molded body 6 thus formed on the mold portion 5 is carried out from the tip portion 2 to the outside 7 of the apparatus by the molding die 3 being extruded by an extruding mechanism (not shown). At this time, the molding die 3 may be attached from the attachment portion so as to be pulled out to the outside 7, or the tip portion 2
You may make it reciprocate by attaching so that it may not come off from the outside.

The powder in the powder kneaded material that can be used here is not limited, and any material such as a ceramic powder, a metal powder, an organic functional powder, or the like can be used. As the binder, those conventionally used such as methyl cellulose and ethyl cellulose can be used in the present invention. Further, as the liquid, water is most preferable if it can be used, but it may be appropriately selected depending on the kind of powder used.

[0011]

With the structure of the present invention, it is possible to provide a method and apparatus for manufacturing a complex-shaped molded body which is suitable for mass production without cutting.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. -Example 1

As shown in FIG. 1, a molding die 3 made of a polypropylene sheet and having a die structure of a desired shape was attached to the tip portion 2 so as to be slidably contacted with each other, and a device for producing a complex shaped body was obtained. An average particle size of 1.0 as a powder kneaded product
52 wt% of silicon nitride powder having a particle size of not more than μm, 8 wt% of methyl cellulose as a binder, 10 wt% of plasticizer, 30 water
wt% was added and mixed and kneaded to obtain a clay-like molding composition 4. The composition 4 is also filled in the mold part 5 formed in the mold 3 by applying pressure from a pressurizing part (not shown). Here, the molding die 3 was extruded from the tip portion 2 to the outside 7 of the apparatus to obtain a molded body 6 having a target shape. A part of the molded body 6 was extruded to the outside 7 of the apparatus and simultaneously separated from the mold portion 5, and the remaining molded body 6 was easily separated by applying a slight force to the molding die 3. At this time, the production speed of each molded body 6 was 1.5 seconds. Example 2 The same as Example 1 except that the molding die 3 was molded from a stainless steel plate. At this time, the production speed of each molded body 6 was 1.5 seconds. -Comparative Example 1 A mold having a target shape was prepared from tool steel surface-hardened and injection-molded as in the conventional case. The production speed at this time was 30 seconds per piece.

[0014]

As described in detail above, according to the manufacturing method of the present invention, it is possible to manufacture a molded article having a complicated shape, which requires a post-process such as a cutting process in the conventional extrusion molding, without the post-process. In addition, mass production has become possible at low cost, which was impossible with conventional injection molding.

Further, by producing a plurality of types of molds in one molding die, it becomes possible to manufacture a plurality of types of molded articles having the desired shapes at one time. Furthermore, the conventionally used manufacturing apparatus such as extrusion molding can be improved and used, and it can be introduced without requiring a large change in the manufacturing space, layout, etc., and it has excellent replaceability.

[Brief description of drawings]

FIG. 1 is an enlarged schematic view of the vicinity of a tip portion of an apparatus for manufacturing a complex-shaped molded body of the present invention.

FIG. 2 is an enlarged schematic view of the vicinity of the tip of a conventional extrusion manufacturing apparatus.

FIG. 3 is a schematic view showing a mold structure which serves as a molding unit of the manufacturing apparatus of the present invention.

FIG. 4 is a view showing an example of the shape of a molded body obtained by conventional extrusion molding. (A) Cylindrical molded body (b) Cylindrical molded body (c) Honeycomb tubular molded body

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mouth 2 Tip part 3 Mold 4 Molding composition made into a clay-like composition 5 Mold part 6 Molded body 7 Equipment outside

Claims (2)

[Claims] 1. A method for manufacturing a powder kneaded product by a molding machine having a squeezing mechanism to obtain a molded body, which is molded into a desired shape by a molding section having a mold structure provided at the tip of the molding machine. A method for producing a complex-shaped molded body, comprising: 2. A manufacturing apparatus for manufacturing a molded product by molding a powder kneaded material with a molding machine having a squeezing mechanism, wherein a molding section having a mold structure corresponding to a target shape is provided at the tip of the molding machine. An apparatus for manufacturing a complex-shaped molded body, which is characterized in that