JPH078247A - Production of elastic mold - Google Patents

Abstract

PURPOSE:To uniformize the thickness and finishing of a mold even in a pointed end part to be the tip of unevenness by spreading silicone rubber to every nook and corner of a tapered part. CONSTITUTION:The surface of a master model 1 having an inverted tapered face or an acute uneven surface is coated with an elastic material 6 composed of silicone rubber and a curing agent. Air is sprayed upon the elastic material 6 applied to the inverted tapered face and in the vicinity of the uneven surface on the surface of the master model 1. The inverted tapered face and the uneven surface side on the master model 1 coated with the elastic material 6 are inverted. The elastic material 6 is cured and the cured elastic material 6 is peeled from the master model 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an elastic mold, particularly
The present invention relates to a method for manufacturing an elastic molding die used for molding a decorative product made of food such as chocolate or gypsum.

[0002]

2. Description of the Related Art Conventionally, a silicone rubber solution is poured into a mold in which a master model is set and cured to form an elastic mold, which is used to reproduce arts and crafts, automobile parts, toys, etc. What is molded is proposed.

In this conventional example, it is necessary to inject a large amount of silicone rubber to make a molding die, and it is not suitable for forming a molding having an inverse taper surface or a sharp uneven surface in terms of die cutting.

On the other hand, on the other hand, it has been proposed to use a split mold by a laminating method suitable for producing a large three-dimensional object or an elastic mold having a complicated shape. This is done by dividing the master model into two easy-to-divide angles, filling one with oil clay, and then overcoating the surface with silicone rubber mixed with a main agent and a curing agent, and then curing the components of this silicone rubber. Wait and put a reinforcing material such as glass cloth.

[0005] Then, silicone rubber is further coated on this, and a lining such as plaster is further applied on this,
After this is fully cured, the oil clay that is half-buried in the master model is removed to complete one side. Then, a release agent is applied to the silicone rubber surface that has been in contact with the oil clay, and the same treatment as above is performed. After lining, the two split surfaces are peeled off and the internal master model is taken out,
A two-divided master block was made, casting resin or the like was injected into the space where the master model was taken out, and after curing, the molded product inside was taken out.

[0006]

However, in such a conventional method for manufacturing an elastic mold, a silicone rubber mold having a relatively complicated shape can be formed, but the forming process is complicated, Although it is suitable for reproduction of arts and crafts, it is not suitable for mass production, and there is a problem that the manufacturing cost rises.

In addition, in the method of injecting silicone rubber on the master model or immersing the master model in the solution of silicone rubber in the container, a thick lump is formed, and therefore a cut is made by a cutter or the like. There is a problem that the elastic mold cannot be manufactured unless it is done.

Further, in all the conventional examples, the elastic molding die is divided in half, and when a final molded product is made using this,
There were streak marks on the half-divided areas, which was insufficient as a decorative molded product.

The present invention has been made by paying attention to the above-mentioned conventional problems, and the silicone rubber can be spread to every corner of the tapered portion, and at the sharpened portion which becomes the tip of the unevenness. Another object of the present invention is to provide a method for producing an elastic molding die, which can make the molding die uniform in thickness and finish and can beautifully produce a large amount of bag-shaped molding dies at low cost.

[0010]

According to a first aspect of the present invention, there is provided a method for manufacturing an elastic molding die, comprising a liquid elastic body comprising a silicone rubber and a curing agent on the surface of a master model having an inverse taper surface or a sharp uneven surface. Applying material, blowing air against the liquid elastic material applied near the inverse tapered surface and the uneven surface of the master model, subsequently, the master model to which the elastic material is applied, Reverse the reverse taper surface side and the uneven surface side so as to face downward,
The liquid elastic material is cured, and the cured elastic material is peeled off from the master model.

According to a second aspect of the present invention, there is provided a method of manufacturing an elastic molding die in which a liquid elastic material is applied to the surface of a master model, air is blown onto the applied liquid elastic material, and then the liquid is used. The master model on which the elastic material is applied, the reverse taper surface side and the uneven surface side are inverted downward to cure the liquid elastic material, and subsequently,
The master model is housed in a release cap, and the hardened elastic material is separated from the master model by an expansion operation by vacuuming the inside of the cap, and after the expansion, the elastic material is separated from the master model. It is the one.

According to a third aspect of the present invention, there is provided a method of manufacturing an elastic molding die in which a liquid elastic material is applied to the surface of a master model, air is blown onto the applied liquid elastic material, and then the liquid is used. The above-mentioned master model on which the elastic material is applied is inverted downward on the reverse taper surface side and the uneven surface side, and subsequently, the same applying step and air blowing step as above are carried out again, and then the master model is applied. While rotating, the elastic material on the surface is hardened, the master model is housed in a mold release cap, and the hardened elastic material is separated from the master model by an expansion operation by drawing a vacuum in the cap, and this expansion After that, the elastic material is separated from the master model.

[0013]

According to the method of manufacturing the elastic molding die of the invention of claim 1, the surface of the master model such as glass, gypsum, stone material, metal, plastic material, ceramic material, wood,
By flowing down a liquid rubber type mixture having a certain viscosity after vacuum defoaming, which is a mixture of silicone rubber and a curing agent, or by applying with a brush,
The rubber mold mixture is covered, and then pressurized liquid air is ejected from the air nozzle to forcefully infiltrate the narrow grooves of the master model's uneven surface and reverse taper surface, and remain in the rubber mixture. The fine bubbles that are being blown out are extinguished.

Further, at this time, since a part where the film thickness of the silicone rubber is non-uniform occurs, the tip of the upper sharpened portion becomes thin, and the groove becomes thick, so that the above master model is temporarily provided. For example, by inverting 180 degrees, the film thickness is made uniform throughout.

Then, the silicone rubber is cured in this state, and after curing, the bag-shaped silicone rubber is peeled off from the master model by rolling up the bag-shaped silicone rubber from the edge portion so that the shape of the master model is accurately obtained. Obtain the corresponding elastic mold.

According to a second aspect of the present invention, there is provided a method for manufacturing an elastic molding die, in which a uniformly thin silicone rubber applied on a master model is evacuated in a cap accommodating the silicone rubber so that the master model is quickly and It enables easy peeling and makes such peeling and releasing work possible automatically and mechanically.

According to a third aspect of the present invention, there is provided a method for producing an elastic molding die, in which the silicone rubber is applied to the master model and dispersed by air blowing.
By repeating before and after the master model inversion / curing process, the coating film of silicone rubber can be arbitrarily selected, and the coating film can be further equalized. (EN) A bag-shaped elastic mold of good quality that is rapidly cured by rotation including revolution and accelerates subsequent mold release work.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 (a) to 1 (h) are process drawings showing in detail the method for manufacturing an elastic mold of the present invention. In FIG. 1, 1 is a master model installed on a table 2, which is made of glass,
The surface is formed smoothly by plaster, stone, metal, plastic, ceramic materials, wood, etc.

Further, this master model 1 has an arbitrary shape for a food product (chocolate or the like) obtained by using a mold produced by the master model 1, here, a corolla shape,
Therefore, in this shape portion, there are a large number of uneven surfaces, reverse taper surfaces, and the like. In addition, in this embodiment, the uneven surface and the reverse taper surface as the uneven portions 3 that are the petals are located on the upper part of the master model in the drawing.

A ring-shaped groove 14 is provided on the base 2 corresponding to the peripheral portion of the lower surface of the master model 1 so that the groove 4 can receive a surplus amount of liquid elastic material as described later. Has become. 5 is the master model 1
A liquid elastic material 6 in which a silicone rubber and a curing agent are mixed from a nozzle 5 which is installed above and above the nozzle.
Are ejected and hang down from the upper surface of the master model 1 to the lower part.

Further, 7 is a plurality of air nozzles arranged opposite to each other above the master model 1 which is intermittently transferred, and compressed air sent from a compressor (not shown) is supplied to the master nozzles of these air nozzles 7. It is sprayed on the elastic material 6 on the model 1 and this is used as the master model 1
And the elastic material 6 are forcibly infiltrated into the details such as the reverse taper surface of the convex and concave portions 3.

Further, 25 is a nozzle similar to the above-mentioned nozzle 5, 27 is a plurality of nozzles similar to the above-mentioned air nozzle 7, and 8 is a separation for vacuum evacuation which covers the master model 1 having the elastic material 6 on its surface. It is a mold cap and functions to evacuate the inside from the intake hole 9 by using a vacuum pump (not shown).

Next, a method of manufacturing the elastic mold will be described. First, in the coating step, a liquid elastic material 6 discharged from a nozzle 5 is made to flow down onto a master model 1 on a platform 2 such as a pallet, as shown in FIG. Subsequently, after a predetermined amount of the elastic material 6 is flown down onto the master model 1 in this manner, the master model 1 is placed on a conveyor and conveyed to the lower part of the air nozzle 7 as shown in FIG. 1B. .

Here, since compressed air having a predetermined discharge pressure is blown out from the plurality of air nozzles 7, the liquid elastic material 6 staying on the master model 1 is below the peripheral surface of the master model 1. The film is formed over the entire surface. In this air blowing step, the compressed air is strong around the upper part of the master model 1, and particularly, the elastic material 6 is strongly blown down at the sharp part which is a part of the convex-concave portion 3, so that the sharp end is extremely thin. On the other hand, on the other hand, the blown-up portion 1 that is difficult to receive compressed air pressure
In case of "a" and the like, the thickness becomes extremely thick, and the film thickness becomes non-uniform as a whole.

Then, the master model 1 is further advanced by the conveyor and sent to the reversing step, where it is reversed as shown in FIG. 1C, and the elastic material 6 is blown on the thin tip. The remaining portion 1a or the like is returned by its own weight to recover the wall thickness to be equal to that of the other portions.

In general, it may be considered that the desired film thickness or infiltration into the inverse taper portion may be insufficient only by such a step-by-step coating step and air blowing step.
Further, after transferring the master model 1 by the conveyor and reversing it in the middle, the second elastic body application is performed by the nozzle 25 as shown in FIG. The air is blown a second time to form a film of the elastic material 6 having a desired thickness as shown in FIG.

In this state, the elastic material 6 becomes thicker. Therefore, in order to efficiently equalize the wall thickness as a whole, as shown in FIG. 1 (f), the master model 1 itself is revolved as shown in FIG. Promotes drying and curing. Here, the elastic material 6 is sufficiently cured so that the wall thickness does not change.

Next, as shown in FIG. 1G, a release cap 8 as a closed container is put on the master model 1 in which the elastic material 6 is hardened in this way, and the release cap 8
The lower end peripheral edge of the master model 1 is made to be close to the inner circumference of the opening. Then, in this state, the inside of the release cap 8 is degassed, that is, evacuated by the vacuum pump or the like through the intake hole 9. Thereby, the vacuum pressure acts on the outer peripheral side of the bag-shaped elastic material 6, and the elastic material 6 expands and separates from the master model 1.

Thus, when the film of the elastic material 6 is completely peeled off from the master model 1, as shown in FIG. 1 (h), the release cap 8 is formed together with the film of the elastic material 6.
Is lifted up and released. As a result, a bag-shaped elastic mold made of the film of the elastic material 6 can be obtained and can be used for molding food such as chocolate.

2 and 3 are system process diagrams showing a coating process and a reversing process in the manufacturing process of the elastic molding die,
Figure 4 shows the revolution of the individual master model itself.
It is a system process drawing which shows a hardening process. According to this
Five master models 1 on a long stand 2 which is a pallet
Is installed and is conveyed from the left side to the right side in the figure by the conveyor 11.

First, these master models 1
Are conveyed to the lower part of the nozzle 5 as described above.

Here, from the tank 12 containing the main agent which is silicone rubber and the tank 13 containing the curing agent,
Pre-calculated amounts of the main agent and the curing agent are supplied, and these are mixed by the static mixer 14 and discharged from the nozzle 5 through the fixed quantity filling valve 15 at each position. Then, the liquid elastic material 6 discharged in this way flows down onto the master model 1 and then the conveyor 1
It is guided to the lower part of the air nozzle 7 by the continuous motion of 1.

The air nozzle 7 is attached to a connecting rod 17 whose both ends are supported by a pair of arms 16 which can be reciprocally rotated, and the connecting rod 17 is guided by the arms 16 (see FIG. 2) or rotated. The air nozzle 7 reciprocates in the traveling direction of the conveyor 11 by reciprocating while rotating circularly or horizontally along the cam (FIG. 3). Each of these air nozzles 7 is connected to an air pipe 20 via a flexible tube 19.

Then, the master model 1 having the elastic material 6 stretched on the surface thereof by the compressed air from the air nozzle 7 is further conveyed to the right by the conveyor 11 and inverted by the inverting means (not shown). After the thickness of the liquid elastic material is made uniform on the surface of the master model, it is further reversed and returned to the second coating step and the air blowing step. Here, the liquid elastic material 6 is discharged from the tanks 12 and 13 similar to the above to the respective nozzles 25, the liquid elastic material 6 is overcoated, and the elastic material is spread by the air nozzle 27.
This is done as shown in (d) and (e).

In this way, the master model 1 which has undergone the second elastic body stretching step is transferred to the guide plate 29 in the rotary drum 28 while being mounted on the base 2 as shown in FIG. It is sent after being given. In the rotary drum 28, the table 2 is placed in the drum axial direction (not shown).
4 units are arranged in the drum axial direction (only 3 units can be seen on the left and right sides in the drawing) and 8 units are arranged in the circumferential direction on the parallel pedestal that guides. Then, the table 2 is sent from the guide plate 29 to the rotary drum 28 by the single table 2.
The stand 2 located at the tip of the upper drum in the axial direction is one stand 2
Is pushed into the guide plate 30 by a belt (not shown) that moves in and out of the drum for the stroke. Further, the rotary drum also performs an intermittent revolver motion so that the eight bases 2 can be successively inserted from the guide plate 29.

In this way, the table 2 in the rotary drum 28 is
At the same time, the master model 1 on the table is individually rotated, and at the same time, the drum 28 is revolved. By properly selecting the rotation speed, the film thickness of the elastic material 6 on each master model 1 is equalized, and the elastic material 6 can be efficiently cured.

And, such rotation / revolution / rotation,
After the curing process, the table 2 is transferred to the guide plate 30, mounted on the conveyor 11 again, and sent to the mold releasing process. And here, FIG. 1 (g),
The expansion and release work shown in (h) are performed to finally obtain an elastic mold.

In the above embodiment, the step of applying the elastic material 6 and the step of blowing the air are shown twice. However, a uniform desired film thickness can be obtained by one step of applying and blowing the air. In this case, FIG. 1 (d) to FIG.
It goes without saying that the step shown in (f) may be omitted and the step shown in FIG. 1 (e) may be directly transferred to the steps shown in FIGS. 1 (g) and 1 (h). At this time, after the step of FIG. 1 (c), after confirming that the elastic material 6 has been sufficiently cured, the bag of the elastic material 6 is rubbed up manually, that is, with the fingertips, and the bag of the elastic material 6 is attached to the master model 1. Even if it is peeled off, an elastic mold similar to the above can be obtained.

[0039]

As described above, according to the invention of claim 1, the surface of the master model having the reverse taper surface and the sharp uneven surface is coated with the liquid elastic material composed of the silicone rubber and the curing agent. , Spraying air on the liquid elastic material applied near the reverse taper surface or uneven surface of the master model, and then applying the master model on which the liquid elastic material is applied to the reverse By inverting the taper surface side and the uneven surface side so as to face downward to cure the liquid elastic material and peel the cured elastic material from the master model, every corner of the taper portion It is possible to spread silicone rubber even up to the point, and it is possible to obtain the effect that the thickness and finish of the molding die can be made uniform even at the sharpened portion that is the tip of the unevenness.

According to the second aspect of the present invention, a liquid elastic material is applied to the surface of the master model, air is blown to the applied liquid elastic material, and then the liquid elastic material is applied. The master model to which the body material is applied is inverted upside down on the reverse taper surface side and the concave-convex surface side, and then the master model is housed in a mold release cap, and cured by evacuation of the cap. The elastic material was peeled off from the master model, and after this expansion, the elastic material was separated from the master model.Therefore, evenly thin silicone rubber applied on the master model was placed inside the cap containing them. It is said that the master model can be quickly and easily peeled off by a simple operation of vacuuming, and the peeling and releasing work can be realized automatically and mechanically. Effect can be obtained.

According to the third aspect of the present invention, a liquid elastic material is applied to the surface of the master model, air is blown to the applied liquid elastic material, and then the liquid elastic material is applied. Is reversed, the reverse taper surface side and the concave-convex surface side downward, subsequently, after performing the same coating step and air blowing step as above again, while rotating the master model , The surface elastic material is cured, the master model is housed in a mold release cap, and the elastic material is separated from the master model by evacuation of the cap,
After this expansion, the elastic material is separated from the master model. Therefore, in addition to the above effects, the application of silicone rubber to the master model and the dispersion of the silicone rubber by air blowing can be performed by reversing the master model. By repeating before and after the curing step, there is an effect that a coating film of silicone rubber can be arbitrarily selected, and that the coating film can be further sufficiently equalized.

[Brief description of drawings]

FIG. 1 is a process drawing showing a method for manufacturing an elastic mold according to an embodiment of the present invention.

FIG. 2 is a system process diagram showing a coating process and a reversing / curing process of the present invention.

FIG. 3 is a system process diagram showing a rotation / curing process of the present invention.

FIG. 4 is a system process diagram as another embodiment different from FIG.

[Explanation of symbols]

 1 Master model 6 Elastic material 8 Release cap

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B29C 41/14 7619-4F // B29K 83:00

Claims (3)

[Claims] 1. A coating step of coating a liquid elastic material composed of a silicone rubber and a curing agent on the surface of a master model having at least a part of a reverse taper surface or a sharp uneven surface; An air blowing step of blowing air to the liquid elastic material applied near the reverse tapered surface or the uneven surface, and the master model in which the liquid elastic material is applied after the air is blown Manufacture of an elastic molding die that performs a reversing / curing step of reversing the surface side or the uneven surface side downward and curing the liquid elastic material, and a peeling step of peeling the cured elastic material from the master model Method. 2. A coating step of coating a liquid elastic material composed of a silicone rubber and a curing agent on the surface of a master model having at least a part of a reverse taper surface or a sharp uneven surface; The air blowing step of blowing air to the liquid elastic material applied near the reverse taper surface or the uneven surface, and the master model in which the liquid elastic material is applied after the air is blown, Side and uneven surface side downward, and inversion / curing step of curing the liquid elastic material, and after the liquid elastic material is cured, the master model is housed in a mold release cap, An expansion step of expanding the hardened elastic material by peeling the hardened elastic material from the master model, and after the expansion, the elastic material is mastered. -A method of manufacturing an elastic molding die, including a releasing step of separating the releasing cap so as to be separated from the model. 3. A coating step of coating a liquid elastic material consisting of silicone rubber and a curing agent on the surface of a master model having at least a part of a reverse taper surface or a sharp uneven surface; The air blowing step of blowing air to the liquid elastic material applied near the reverse taper surface or the uneven surface, and the master model in which the liquid elastic material is applied after the air is blown, Side and uneven surface side is inverted downward, after the inversion step, after performing the same coating step and air blowing step again as described above, the master model is rotated, and the liquid elastic material on the surface is removed. After the rotation / curing step of curing and the liquid elastic material are cured, the master model is housed in a mold release cap, and An expansion step of expanding the cured elastic material by peeling from the master model by emptying, and a releasing step of separating the release cap so as to separate the elastic material from the master model after the expansion. A method for manufacturing an elastic mold to be carried out.