JP2543301B2 - Method of manufacturing mold for three-dimensional molded product - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper mold used for forming a cushion member for packing electrical appliances by a pulp molding method, a wire mesh is stretched on the paper mold, and a fibrous material is formed into a layer having a predetermined thickness. The present invention relates to a method for producing a mold for a three-dimensional molded product in which a layered fibrous material is removed by a mold.

[0002]

2. Description of the Related Art First, a manufacturing method by a pulp molding method will be described with reference to FIG.

In the pulper a, the fed raw material b and water c are mixed and disintegrated into pulp, and then the raw material refining machine d
In, the foreign matter such as dust and metal is removed, the concentration is adjusted, and the diluted pulp slurry e is sent to the storage tank f of the molding machine g. As shown in FIG. 7, the molding machine g is provided with a plurality (six in the illustrated example) of papermaking molds i covered by a wire mesh h at equal intervals around the circumference, and is rotated clockwise to produce pulp. The slurry e is adsorbed and the pulp molding j is formed into a layer on the surface of the wire mesh h. The take-out machine k is provided with a plurality (three in the illustrated example) of take-up dies m, which engage with the outer shape of the molded product j, at equal intervals on the circumference, and swivels in the counterclockwise direction. The pulp molded product j is taken out and transferred to the conveyor p of the hot air dryer n.
Then, the molded product j carried out from the conveyer p is taken out, or if necessary, is heated and molded in the heat molding machine q to finish.

A method of manufacturing a die including the above-described paper making die i, wire netting h and take-up die m will be described with reference to FIG.

In the papermaking type i, aluminum castings are machined, and the outer diameter of the pulp slurry e for sucking water is, for example, 2 m.
A large number of pores i1 of m (for example, one per 1 cm ² )
Perforated.

Similarly, the die m is formed by machining an aluminum or resin cast product, and the same fine hole m1 for extraction and suction is formed.

As shown in FIG. 5, the wire mesh h has a wire diameter δ of 0.
A stainless wire w of 2 mm is assembled to have a thickness t of 0.4 mm, for example, and is stretched on the surface of the papermaking mold i.

[0008]

[Problems of the prior art] However, according to the prior art, a wire mesh is manually stretched on a paper-making mold, and it is difficult to stretch sharp corners or narrow places. Although the wire nets are stretched and then fitted together, the wire nets overlap each other at the divided portions, which easily causes a gap between the molds, making it difficult to bring the molds into close contact with each other. Furthermore, if there is an acute-angled part in the mold, it is difficult to attach the wire mesh tightly to that part and stretch it.Therefore, there are places where the wire mesh does not adhere, the dimensional accuracy of the mold is poor, and more than one mold Since it is made of cast metal, there are variations in the dimensions between the molds. As a result, the items to be packaged are not sufficiently fixed or move loosely, which further hinders automation of the packaging line by the robot.

Further, as described above, the dimensional accuracy is poor, which results in deformation and twisting, and because the dividing surfaces of the papermaking die are not in close contact with each other, there are surface defects such as streaks in the product. .

Further, if a gap is created between the papermaking die and the wire net, the fibers will squeeze into the gap due to the pressing force of the take-up die during molding, and the pushing force of the take-up die cannot be increased. However, the water content could be dehydrated only to 70 to 80%. Further, when a wire mesh having a gap is repeatedly adsorbed and peeled off, the life of the wire mesh is shortened because the wire mesh is not in close contact, and when the wire mesh is pressed with a dehydrating mold or a take-up mold in order to improve the surface property, the pain of the wire mesh becomes severe.

In addition, conventionally, casting production, cutting,
The manufacturing process such as making a mold and wire meshing was complicated and took many days (about 60 days), which resulted in poor productivity and high cost.

[0012]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for manufacturing a die for a three-dimensional molded article which has good productivity and good wire mesh adhesion.

[0013]

[Observation] As a result of various researches, the present inventor has found that the punching-based die, the wire netting, and the die can be simultaneously formed by the known counter hydraulic drawing process. The present invention has been made based on this finding.

[0014]

The method according to the present invention is a three-dimensional molded article in which a wire mesh is stretched over a papermaking mold, a fibrous material is formed in a layered manner to a predetermined thickness, and the layered fibrous material is removed by a molding die. In the method of manufacturing a mold, a first plate body having a predetermined thickness to be a paper mold, a wire net, a second plate body having a predetermined thickness to be a pseudo product, and a third plate body to be a mold are stacked. The laminated product is characterized by being integrally molded at the same time by facing hydraulic drawing and then removing the dummy product.

For the first to third plates, it is preferable to use an aluminum plate that can be easily processed.

[0016]

In the present invention, a paper punch is made by one punch,
By simultaneously forming a wire net and a mold, then punching pores in the paper mold and the mold, and then bonding the wire mesh to the paper mold,
It is possible to easily and inexpensively manufacture a plurality of molds.

[0017]

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

First, the facing hydraulic drawing process for carrying out the present invention will be described. The work W is placed on the upper surface of the die D having the hydraulic dome L (FIG. 1). Next, the wrinkle holding plate C is lowered to hold the work W, the punch P is lowered to form the work W into the shape of the punch P by hydraulic pressure (FIG. 2), and the punch P and the wrinkle holding plate C are raised. , The take-out rod B is raised to take out the formed work W (Fig. 3).

FIG. 4 shows a papermaking die 1, a wire netting 3, a pseudo product 4 and a take-up die 5 obtained by the present invention. The pores 2 of the paper-making die 1 and the pores 6 of the take-up die 5 are shown. Are perforated after molding.

At the time of molding, as shown in FIG. 5, on the upper surface of the die D in FIG. 1, a first plate body 1a made of, for example, an aluminum plate having a predetermined thickness T1 and a wire mesh material 3a which become the papermaking mold 1 in order from above. , A second plate 4a made of, for example, an aluminum plate having a predetermined thickness T2, which is a pseudo product 4, and a third plate 5a made of, for example, an aluminum plate, having a predetermined thickness T3, which is a mold 5 (this superposition is performed). 1 corresponds to the work W in FIG. 1), and in FIG. 2, the punch p and the hydraulic dome L are integrally molded at the same time by the hydraulic pressure, taken out in FIG. Take out the product 4 and the mold 5 integrated.

Next, the integrated product is disassembled, and the papermaking mold 1 is perforated with the pores 2 and then the wire net 3 is bonded and fixed,
The pores 6 are perforated in the mold 5 to finish.

[0022]

As described above, according to the present invention, the following excellent effects are exhibited.

(1) It is possible to easily manufacture a plurality of molds having accurate dimensions by making one punch.

(2) Since the punch is formed, the die manufacturing time is reduced (about 20 days) and the delivery time can be shortened.

(3) The surface of the mold is clean,
And the dimensional accuracy is improved.

(4) Since the wire nets are in close contact with each other, the wire nets are not deformed during operation and the life is long.

(5) Since the fiber material formed on the surface of the wire mesh by the take-up mold can be strongly compressed, the water content can be further dehydrated by 5 to 15%, and the amount of steam used can be saved.

[Brief description of drawings]

FIG. 1 is a side cross-sectional view showing a state in which a work is set for explaining an aspect of facing hydraulic drawing.

FIG. 2 is a side sectional view showing a drawing process.

FIG. 3 is a side sectional view showing a taking-out step.

FIG. 4 is a side sectional view showing a mold and a pseudo product obtained according to the present invention.

FIG. 5 is a side cross-sectional view showing a state in which first to third plate bodies and a wire net are stacked.

FIG. 6 is a flow sheet diagram for explaining a pulp mold manufacturing process.

FIG. 7 is a side sectional view for explaining details of the molding step of FIG.

FIG. 8 is a side sectional view showing a conventional mold.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Papermaking type 1a ... 1st plate body 2, 6 ... Pore 3 ... Wire mesh 3a ... Wire mesh material 4 ... Simulated product 4a ... 2nd plate body 5・ ・ ・ Molding die 5a ・ ・ ・ Third plate body B ・ ・ ・ Ejection rod C ・ ・ ・ Wrinkle pressing plate D ・ ・ ・ Die L ・ ・ ・ Hydraulic dome P ・ ・ ・ Punches T1 to T3 ・ ・ ・Thickness W ... Work a ... Pulper b ... Raw material c ... Water d ... Raw material refining machine e ... Pulp slurry f ... Storage tank g ... Molding machine h ...・ Wire mesh i ・ ・ ・ papermaking mold i1, m1 ・ ・ ・ pores j ・ ・ ・ pulp molded product k ・ ・ ・ picker m ・ ・ ・ taker n ・ ・ ・ hot air dryer p ・ ・ ・ conveyor q ・・ Hot molding machine

Claims (1)

(57) [Claims] 1. A method for producing a mold for a three-dimensional molded article, comprising: forming a metal mesh on a papermaking machine; forming a fibrous material in a layered manner to a predetermined thickness; and removing the layered fibrous material in a molding die. A first plate body having a predetermined thickness, a wire mesh, a second plate body having a predetermined thickness serving as a pseudo product, and a third plate body serving as a mold, and the stacked plate body is used as a counter liquid. A method for manufacturing a die for a three-dimensional molded product, which comprises simultaneously forming integrally by pressure drawing and then removing a pseudo product.