JPH07189199A - Production of mold for molding - Google Patents

Abstract

PURPOSE:To provide a method for producing a mold for molding having good productivity and not using wire net. CONSTITUTION:The characteristic of this method for producing a mold for molding comprises superposing the first plate body (1a) having a prescribed thickness to become a molding (1) for paper making, the second plate body (4a) having a prescribed thickness to become a pseudo product and the third plate body to become a mold (5), simultaneously integrally forming the superposed plate body into a prescribed shape by drawing, taking out the pseudo- product (4) and boring a number of fine holes (2, 6) on the first plate body (1a) and the third plate body (5a) so as to give >=0.2m/m and <=0.5m/m hole diameter and >=0.8m/m and <=2m/m hole pitch.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a molding die in which a papermaking mold is provided with a large number of pores, a fibrous material is formed into a layer having a predetermined thickness, and the layered fibrous material is removed by a taking die. Regarding

[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 in the raw material tempering machine d, foreign matters such as dust and metal are removed, and the concentration is adjusted to dilute. The pulp slurry e is sent to the storage tank f of the molding machine g. As shown in FIG. 8, the molding machine g is provided with a plurality (six in the illustrated example) of papermaking molds i covered with a wire mesh h at equal intervals around the circumference. 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 of (three in the illustrated example) take-up dies m which engage with the outer shape of the molded product j, and are arranged at equal intervals on the circumference. Pulp molding j
It 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, heat-molded in the heat-molding machine q to finish.

A method of manufacturing a die including the above-described papermaking 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 are formed (for example, one per square centimeter).

The take-up mold m is similarly machined from an aluminum casting or a resin molded product, and the same take-out / suction pores m1 are punched.

As shown in FIG. 5, the wire mesh h has a wire diameter of 0.2.
The stainless wire w of m / m is assembled to have a thickness of 0.4 m / m, for example, and is stretched on the surface of the papermaking mold i.

[0008]

However, according to the prior art, the wire mesh is manually formed into a paper mold, and it is difficult to stretch a narrow space or an acute angle portion. Particularly, complicated shapes are divided and formed. For example, when a wire mesh is attached to the molds and the metal meshes are fitted to each other, the wire meshes overlap each other at the mating portion, so that a space is likely to be formed between the respective molds and it is difficult to bring the respective molds into close contact with each other. Furthermore, if there is an acute-angled part in the mold, it is difficult to adhere the wire mesh tightly, the mold dimensional accuracy is poor, and since multiple molds are made by casting, there are variations in the sizes between the molds. However, the items to be packaged are not fixed sufficiently, loosening occurs, and there are obstacles to automation of the packaging line by the robot.

Further, as described above, the dimensional accuracy is poor, so that there is deformation or twisting, and since the dividing surfaces of the papermaking mold 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 mold and the wire net, the fibers will enter the gap due to the pressing force of the take-up die during molding of the mold, so that the pushing force of the take-up die cannot be increased, and the moisture content will not increase. Could only be dehydrated to 70-80%. Also, when a wire mesh with a gap is repeatedly adsorbed and peeled off,
The life of the wire mesh is shortened, and when the wire is pressed with a mold to improve the dehydration property and the surface property, the wire mesh becomes more painful.

[0011] The manufacturing process such as casting manufacturing, cutting, forming of mold, and wire netting is complicated and takes many days (about 6
(0th) Productivity was low and cost was high.

[0012]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for manufacturing a mold for molding which has good productivity and does not use a wire net.

[0013]

[Observation] As a result of various researches, the present inventor has found that, according to the known counter-pressure drawing process, a punch can be used as a base to simultaneously form a die and a die. The present invention was made based on this finding.

[0014]

According to the present invention, a molding die is provided with a large number of pores in a papermaking mold, a fibrous material is formed into a layer having a predetermined thickness, and the layered fibrous material is removed by a die. In the mold manufacturing method, the pore diameter is 0.2 m / m or more and 0.8 m
/ M or less and the hole pitch is 0.8 m / m or more.2.
A large number of pores of 0 m / m or less are bored in a first plate body having a predetermined thickness to be a paper mold, and the first plate body and a second plate body having a predetermined thickness to be a dummy product are taken. A method for manufacturing a molding die, characterized by stacking a third plate body, which is to be is doing.

It is preferable to use an aluminum plate which is easy to process for the first and third plates.

[0016]

In the method of manufacturing the mold for molding of the present invention,
A single punch can be used to simultaneously mold a papermaking mold and a take-up mold,
Then, by punching a large number of pores in the papermaking mold and the take-up mold, it is possible to easily and relatively inexpensively manufacture a plurality of molds without variations in dimensions.

The above-mentioned fine pores have a diameter of 0.2.
If the hole diameter is 0.5 m / m or less, pressure loss occurs due to clogging, and if the hole diameter is 0.5 m / m or more, the fibrous material is sucked and the surface property deteriorates, which is not preferable.

Further, if the pitch of the holes is 0.8 m / m or less, it is difficult to process, and if it is 2.0 m / m or more, there is a problem that the moisture of the pulp slurry is partially sucked and the uniformity is lost. Not preferable.

[0019]

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

First, a description will be given of a counter hydraulic drawing process which is an example of the counter pressure drawing process for carrying out the present invention. The work W is placed on the upper surface of the die D having the hydraulic dome L (FIG. 1). Then, the wrinkle holding plate C is lowered to hold down 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 pseudo product 4, and a take-up die 5 obtained in the present invention. The pores 2 of the papermaking die 1 and the pores 6 of the take-up die 5 are perforated after molding. It

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 to become the papermaking mold 1 in order from above, and a pseudo product 4 are formed. Next, a second plate 4a made of, for example, an aluminum plate having a predetermined thickness T2 and a third plate 5a made of, for example, an aluminum plate having a predetermined thickness T3 to be the forming die 5 are overlapped. 1 corresponds to the work W), and in FIG.
And the hydraulic dome L are simultaneously formed integrally by the hydraulic pressure, taken out in FIG. 3, and taken out in which the papermaking die 1, the pseudo product 4, and the take-up die 5 shown in FIG. 4 are integrated.

A large number of pores 2 are preliminarily formed in the papermaking mold 1. The pores 2 have a diameter of 0.2 m / m or more and 0.5
m / m or less (eg 0.4 m / m), hole pitch is 0.8
The holes are drilled so as to be not less than m / m and not more than 2.0 m / m (for example, 1.5 m / m) (see FIG. 6). Further, if the fine recesses 7 having a maximum depth of 0.5 mm are further provided by etching, the dehydration effect is improved. Providing the concave portion 7 in this way improves the aesthetic appearance, and it is more preferable to form a character or pattern for specifying the papermaking type.

Here, the pressurizing means for press forming is not limited to the hydraulic pressure, and may be gas, mechanical means or the like.

If desired, heating may be performed, for example, about 900 ° C. for stainless steel and 4 for aluminum.
00 ° C is good.

The holes 2, 6 are arranged in a staggered manner,
It may be random, and is not restricted by methods such as machining and etching laser.

[0026]

As described above, the present invention has the following excellent effects.

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

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

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

(4) Since the diameters and pitches of the pores of the paper making mold and the take-up mold are appropriately selected, the pores are not clogged and the surface of the mold is not roughened, and the processing is easy and the quality is stable. To do.

(5) Since there is a pseudo product between the take-up mold and the papermaking mold, the dimensional accuracy is remarkably improved.

[Brief description of drawings]

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

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

FIG. 3 is a side sectional view showing a take-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 sectional view showing a state in which first to third plate bodies are stacked.

FIG. 6 is a view showing a cross section of a papermaking mold.

FIG. 7 is a flow sheet diagram for explaining a pulp mold manufacturing process.

FIG. 8 is a side sectional view for explaining details of the molding step of FIG.

FIG. 9 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 4 ... Pseudo product 4a ... 2nd plate body 5 ... Take-up mold 5a ... 3rd plate body B ... Extraction stick C ... Wrinkle holding plate D ... Die L ... hydraulic dome P ... punch T1-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 j ... Pulp molded product k ... Take-out machine m ... Take-up mold n ... Hot air dryer p ... Conveyor q ... Heat molding machine

Claims (1)

[Claims] 1. A method for producing a mold for molding, wherein a large number of pores are provided in a papermaking mold, a fibrous material is formed into a layer having a predetermined thickness, and the layered fibrous material is removed by a molding die.
A large number of pores having a pore pitch of 2 m / m or more and 0.8 m / m or less and a pore pitch of 0.8 m / m or more and 2.0 m / m or less are punched in the first plate body having a predetermined thickness to be a paper mold. The first plate body, the second plate body having a predetermined thickness serving as a pseudo product, and the third plate body serving as a mold are overlapped with each other, and the stacked body bodies are opposed to each other in a predetermined shape. A method for producing a mold for molding, characterized in that the dummy product is removed after being integrally molded at the same time by processing.