JPH08294743A - Lost wax pattern method using leather - Google Patents

Abstract

PURPOSE: To manufacture an object of craftwork where the leather is transferred to the metal by providing a runner in a wax pattern where the tanned leather is dipped in the liquid wax, coating the surface to form a mold, and removing the wax to pour the liquid metal. CONSTITUTION: The leather which is sufficiently tanned until it is of the prescribed thickness is dipped in the liquid wax until no bubbles are generated, and a wax pattern 16 is formed, and worked to be of the desired shape while it is soft. When the wax pattern 16 is cooled, a runner 18 made of wax is formed to be the wax pattern, the surface is coated with the invest material, and solidified while the invest material is dried, and heated to the prescribed temperature to remove the wax and the leather inside thereof. Then, it is burned at the prescribed temperature to form a mold, and the prescribed metal is poured therein. Only one art object of craftwork where the surface of the leather is transferred to the metal can be manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lost wax method and, more particularly, to a lost wax method suitable for producing arts and crafts by utilizing the feeling of materials such as leather and wood.

[0002]

2. Description of the Related Art The lost wax method is one of the typical precision casting methods, and has been conventionally used for casting fine processed products or arts and crafts such as rings. It is known to apply the lost wax method to such arts and crafts. However, in recent years, using such a lost wax method, there is a demand for the production of arts and crafts that make use of the sensation of the surface of various materials, for example, the surface of leather and wood.
That is also a recent trend.

Conventionally, when the resin surfaces of leather and wood are used as arts and crafts, after forming a brazing mold, the surface of the skin or the surface of the wood is pressed against the brazing mold to form the aesthetic appearance of the surface. Was. However, according to the usual method, an uneven surface opposite to the original surface of the wood is formed, and usually two steps are used. That is, it is a method of pressing the surface of the leather or wood against the first model and forming a brazing mold from the model. That is, in the conventional method, the aesthetics of the surface of the resin or the leather is used as an art craft by using the first model and the second brazing mold. However, this method is troublesome and time-consuming, and is not always preferable, and because it is pressed twice more,
It is also possible that the skin's surface sensation is lost.

However, the arts and crafts were originally one type, and it was rare to make several hundred pieces. When making hundreds of arts and crafts with one mold in this way, the above method should be profitable or satisfactory to a certain degree, but usually arts and crafts have more than one. In some cases, it may not be desired to make individual replicas. On the contrary, in some cases it may be preferable to make one of the originals. In such a case, it is not always efficient to manufacture by the lost wax method using the above-mentioned two times model.

[0005]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method of making one type of arts and crafts (a replica of which is not produced). This method does not produce hundreds or even dozens of crafts from one mold, but it is an effective method in the sense that it produces only one. However, in recent years, such a casting method that allows only one has a certain value.

[0006]

SUMMARY OF THE INVENTION The skin-containing lost wax process of the present invention uses skin as part of a brazing mold. To begin with, the skin mainly consists of fat and fiber, and this fat can be considered to be the same type as wax. Further, the fiber component also has a higher melting temperature than the wax, but this can also be removed (burned) by performing a high temperature treatment to some extent.

Therefore, in the method of the present invention, the leather is impregnated into the wax, and the structure obtained by synthesizing the leather and the wax is used as a conventional brazing mold. The conventional brazing type does not contain any leather component, but such a method has hitherto not been performed because it is considered that the leather component is contained in the metal. Therefore, the present invention is to utilize the leather component as part of the lost wax.

[0008]

The present invention will be described below with reference to the drawings. In FIG. 1, in the step of licking the skin 10 of (A), the skin 10
Is the normal tanning process of about 20% of the original skin thickness
Fully lick the leather to a thickness of 30%. At this time, since the feel of the surface of the leather 10 is often important for arts and crafts, it is preferable to lick the back surface of the leather 10. This skin morphology, that is, the three-dimensional shape of the skin, is convenient at the time of later molding when considering at the time of tanning. However, it is not always necessary to consider it, but it may be shaped so that it can be easily molded after impregnation in the wax of the following (B).

Next, the tanned leather 10 as described above is impregnated into the fluidized (liquid) wax 14 contained in the container 12. Although the temperature of the wax 14 varies depending on its constituent composition, it is preferably equal to or higher than the temperature at the time of performing the brazing step (E). The time for impregnating the skin 10 in the fluid wax 14 is not always constant, but at least while the skin 10 is impregnated in the wax 14, bubbles are generated for the first time in the beginning, It is necessary to do it at the time when it completely disappears. At this time, if the wax impregnation process is terminated while air bubbles are coming out, air bubbles will remain inside the leather, and the quality of the original leather or wood may be impaired on the surface of the metal after casting. Requires.

Next, as described above, the brazing die 16 composed of the leather 10 and the wax 14 can be formed. At this point, the brazing die 16 is formed into a desired shape while the wax is soft. The desired shape in this case is to some extent satisfactory with any type of mold, since precision casting, which is an advantage of lost wax, is achieved.

Next, as shown in FIG. 3, when the brazing die 16 thus formed is cooled, a brazing runner 18 is formed in the brazing die 16 made of leather and brazing. This bran runner 18
The formation of is the same as the usual lost wax method or the casting method of castings, and is not applied to the special lost wax method containing leather.

Next, the runner formed as described above may be formed into a hanging shape by forming a plurality of types of braces. In this case, a plurality of types of castings can be completed by casting once. This is also the same as the usual lost wax method.

Next, the brazing die 16 thus formed
The formation of the mold (shell) will be described below. There are various methods for producing the mold (shell). The surface of the brazing mold 16 is coated with an investment material and hardened to form a mold.
For coating, make a solution in which fine refractory powder is mixed with a binder, immerse the brazing mold 16 in this, sprinkle the refractory sand grains on the pattern, dry it, and soak it in the solution again, Sprinkle on. Such an operation may be repeated several times, and the outer layer at that time may be sprinkled with thicker sand grains than the inner layer. The mold 20 formed of such sand is dried. As shown in FIG. 5, by removing the brazing after the drying (removing the inner brazing), a multi-layer shell mold 20 is completed. A typical mold 20 is shown in FIG. The mold 20 is formed by solidifying sand around the brazing mold 16. This is suitable when the brazing die 16 has a simple shape.

Next, as described above, the mold 20 containing the brazing mold 16 therein is heated at a heating temperature of about 100 to 150 ° C. to remove (de-braze) the internal brazing and the leather 33. At this time, the fat content of the leather and the wax can be removed together, but in some cases, some fiber components of the leather may remain. However, it is not always necessary to completely remove the fiber component of the leather in this dewaxing step.

Next, the mold 20 is fired. This mold 2
It is not always necessary to perform the separate steps of the baking process of 0 and the de-brazing process, and the steps of (E) and (F) may be simultaneously performed by gradually increasing the temperature.
At this time, the temperature of the mold 20 is raised to about 800 to 1200 ° C. This is a little higher than normal temperature, but also to remove the fibers of the leather.

Next, the required metal 26 is injected into the mold 20 maintained at the above temperature (FIG. 6). In this case, considering that the present invention is used as an art craft, the necessary metal is a noble metal such as gold, silver or platinum. Usually, the melting temperature of these noble metals is around 1200 ° C., so the metal 26 heated to these temperatures is injected into the mold 20. The melt may be injected in a vacuum or in an inert gas, but considering that it is a precious metal arts and crafts, it is preferable to perform the injection in a vacuum because bubbles are not contained therein. In this way, the mold 20 formed of the surrounding sand is removed after the pouring. The product 28 (FIG. 7) taken out as described above has its surface formed of metal, and no leather fiber component is observed.

[0017]

As described above, according to the method of the present invention, since the leather is used as a part of the lost wax, the surface of the leather is directly transferred to the metal, which is extremely valuable as an art craft. It will be expensive. Furthermore, as in the case of the ordinary lost wax method, the mold or dimensional accuracy is considerably high, and the finishing process is relatively easy. In the present invention, since the melting point of gold, silver, platinum, etc. is relatively high, the surface of the metal does not become rough,
Also, the mechanical strength does not decrease. This requires the original characteristics of metal,

As in the present invention, it is an extremely advantageous condition for arts and crafts in a single item life. Further, the method of the present invention has a drawback that it is not possible to make a plurality of identical products, which is also an advantage in arts and crafts. That is, since there is no replica, the product manufactured by the present invention can be expected to be distributed in the market as an extremely expensive product.

[Brief description of drawings]

FIG. 1 is a diagram showing an outer shape of a leather after the leather is licked.

FIG. 2 is a diagram showing a state in which the leather formed in FIG. 1 is immersed in wax.

FIG. 3 is a view showing a state in which the runner is bonded to the brazing die made of wax with the leather formed as described above.

FIG. 4 is a diagram showing a step of forming a mold by coating the surface of the brazing die having the runner.

FIG. 5 is a diagram showing a step of de-brazing the mold formed as described above.

FIG. 6 is a diagram showing a state in which the mold is heated to a high temperature.

FIG. 7 is a view showing a state in which a liquid noble metal is injected into the mold formed as described above.

FIG. 8 is a view showing a state in which a target casting (decoration product) is taken out after removing the mold formed as described above.

[Explanation of symbols]

 10 leather 12 container 14 wax 16 brazing type 18 runner 20 mold 22 sand 24 container 26 liquid metal 28 ornaments 33 leather and brazing

Claims (10)

[Claims] 1. A step of fully licking a leather (10) (FIG. 1), and (B) a step of immersing the tanned leather (10) in the liquid wax (14) (FIG. 2). And (C) a brazing type (1
(6) forming a runner (181) (FIG. 3), and (D) forming a mold (20) from a brazing die having the runner formed in the above step (FIG. 4), E) a step (FIG. 5) of removing the brazing (33) from the mold (20); (F) a step of injecting a liquid metal (26) into the mold (20) (FIG. 6); and (G) a mold. And a step of finishing the molded product (28) (FIG. 7) after removing. 2. The mold (2) is provided before the step (F).
0) is fired, and during the step (f), the template (2
The method of claim 1 further comprising maintaining 0) at its firing temperature. 3. The method according to claim 1, wherein in the step (E), the mold (20) is heated to a temperature of 100 ° C. or more and 110 ° C. or less. 4. The method according to claim 1, wherein the liquid metal injected in the step (F) is a noble metal. 5. The method of claim 4, wherein the noble metal is one of gold, silver and platinum. 6. The method according to claim 2, wherein the remaining leather component is removed in the step (E) in the step of firing the mold. 7. In the step of baking the mold, 8
The method according to claim 2, wherein the heating is performed at a temperature of 00 ° C or more and 1300 ° C or less. 8. The method of claim 1, wherein the step (F) is performed in vacuum. 9. (A) a step of fully licking the skin (10) (FIG. 1); and (B) a step of immersing the tanned skin (10) in a liquid wax (14) (FIG. 2). And (C) a brazing type (1
(6) forming a runner (181) (FIG. 3), and (D) forming a mold (20) from a brazing die having the runner formed in the above step (FIG. 4), E) a step (FIG. 6) of injecting a liquid metal (26) into the mold (20) while removing the brazing (33) from the mold (20), and (F) removing the mold and then molding ( 28) finishing step (FIG. 7). 10. A step (A) of preparing a skin (10) (FIG. 1), and a step (B) of immersing the skin (10) tanned in the step in a liquid wax (14) (FIG. 2). (C) A brazing type (1
(6) forming a runner (181) (FIG. 3), and (D) forming a mold (20) from a brazing die having the runner formed in the above step (FIG. 4), E) a step (FIG. 5) of removing the brazing (33) from the mold (20); (F) a step of injecting a liquid metal (26) into the mold (20) (FIG. 6); and (G) a mold. And a step of finishing the molded product (28) (FIG. 7) after removing.