JPH0596342A - Method and device for manufacturing wax pattern for molding metal product - Google Patents

Abstract

PURPOSE:To manufacture a wax pattern for manufacturing a metal product, in which consumption of a rubber material mainly containing silicone is made to the min. CONSTITUTION:A master model 11 and the rubber material mainly containing the silicone are incorporated in the inner part of a first space part 5 as changeable to the size in a first frame part 2, and by pressurizing the rubber material, the rubber mold 31 which the master model 11 becomes embedding state, is manufactured and the rubber mold removed from the first frame part is set in a second space part in a second frame part and the rubber material is supplied in the lower half part of the second space part and hardened to form the lower side outer frame body. At the time of hardening the lower side outer frame body in some degree, the rubber material is supplied in the upper half part of the second space and hardened to form the upper side outer frame body. At the time of hardening both outer frame bodies, these are removed from the second frame part and both outer frame bodies are separated and the rubber mold is cut off to the upper and lower parts at any position to take out the master model in the inner part thereof. Then a cavity by the master model is constituted in the inner part of the rubber mold and the rubber mold is incorporated in the inner part of the outer frame body, and the wax is pressed into the cavity in the rubber mold and hardened to manufacture the wax pattern having the same shape as the master model.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wax type manufacturing method and manufacturing apparatus which are mainly used for molding rings, earrings, tie pins, buttons, and other relatively small metal accessories.

[0002]

2. Description of the Related Art As is well known, when molding a relatively small metal product, a master model is prepared by engraving a metal or making a wax with a high melting point and using a rubber containing silicon as a main component. A rubber mold in which the rubber mold is embedded, the wax mold molded by this rubber mold is embedded in the sand mold, the molten metal is press-fitted into the sand mold to eliminate the wax mold, and a metal product in the shape of the wax mold is formed. It is manufactured.

[0003]

There are various shapes and structures of relatively small metal products. Conventionally, the same frame material is used for any shape and structure. I am making a rubber mold. Therefore, even when a small metal product is manufactured or a metal product having a certain size is manufactured, the amount of the rubber containing silicon as a main component, which is extremely expensive, is the same, resulting in a great economic loss. Further, since the rubber molds always have the same size, the cutting work is extremely troublesome and takes a long time when the embedded master model is taken out, which lowers the efficiency of the wax mold manufacturing work. It was the cause. Therefore, there has been a demand for a method and an apparatus capable of producing a wax mold by a simple operation while minimizing the amount of expensive rubber used.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned drawbacks of the related art and to meet the demands of the related art, and the size of the dividable first frame portion can be changed. A master model and a rubber material containing silicon as a main component are housed inside the first empty space, and the above rubber material is pressed to produce a rubber mold in which the master model is embedded,
Setting the above-mentioned rubber mold removed from the first frame part in the second empty part of the second frame part, and supplying a rubber material to the lower half part of the above-mentioned second empty part to cure it. To form a lower outer frame body, and after the lower outer frame body is cured to some extent,
The upper outer frame body is molded by supplying a rubber material to the upper half of the empty space and curing it, and when the lower outer frame body and the upper outer frame body are cured, they are demolded from the second frame part and The side outer frame body and the upper outer frame body are separated, and the rubber mold facing the front side by separating both outer frame bodies is vertically cut in an irregular state,
Take out the master model inside the rubber mold, form a void part by the master model inside the rubber mold, store the above rubber mold inside the outer frame body and press the wax into the void part of the rubber mold. By curing, a wax mold having the same shape as the master model is manufactured.

[0005]

By storing and installing one or a plurality of blocks corresponding to the master model in the first empty portion of the first frame portion and minimizing the size of the first empty portion with respect to the master model, The size of the rubber mold can be minimized to minimize the use of expensive rubber.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments of the drawings. FIG. 1 shows a first frame portion 2 and the like used in a manufacturing apparatus 1 for a wax mold for molding a metal product of the present invention. The first frame portion 2 described above is a pair of left and right plane U-shaped frames. The first frame portion 2 having the first empty portion 5 can be formed by joining the frame bodies 3 and 3 and joining both frame bodies 3 and fastening the left and right with fastening bolts 4. When the bolt 4 is removed from the first frame portion 2, each frame body 3 can be divided. However, the first frame portion 2 may be configured to be dividable by three or more frame bodies 3. Examples of the metal product in the present invention include rings and ring stands, necklaces, earrings, tie pins,
Mainly accessories and buttons such as buttons and medals, which are relatively small.

A master model 11 having the same shape as the metal product to be manufactured is provided in the first empty portion 5 of the first frame portion 2 described above.
To store. The master model 11 described above is produced, for example, by engraving a lump of metal, or by using a wax or resin having a high melting point as a raw material, and a support pin 13 is projected at one end of a model portion 12 corresponding to a metal product. It has been configured.

Further, a plurality of blocks are housed and installed in the first empty portion 5 of the first frame portion 2 described above, and the internal dimensions of the first empty portion 5 are adjusted. In the embodiment of the present invention shown in FIGS. 1 to 3, the first block 21 accommodated at one inner end of the first empty space 5 and the second block 21 accommodated at the other inner end of the first empty space 5. 22, a third block 23 housed in the upper and lower parts of the first empty space 5, and a fourth block 24 arranged on the upper and lower surfaces of the third block 23 described above. Since 12 is shown as a ring and is a relatively small metal product, each block is stored and installed in the first empty space 5,
The internal space of the first empty portion 5 is made as small as possible within the range where the model portion 12 is accommodated. And the first
An opening 25 and a small hole 26 are formed on one side surface of the block 21 of the master model 11, and the support pin 13 of the master model 11 is formed in the small hole 26.
The model portion 12 is positioned in the center of the inside of the first empty portion 5 by being inserted into the.

Therefore, when the first block 21 having the master model 11 mounted therein is housed in the first empty space 5 and the plurality of blocks described above are properly housed, the space of the first empty space 5 is previously stored. The first block 5 is closed and the model part 12 of the master model 11 is placed in the center of the first block 5 by storing and installing the remaining blocks by storing the amount of rubber material corresponding to the part. In this state, the rubber material is pressed in this state, or is pressed while being heated to be cured. The above-mentioned rubber material is mainly composed of silicon and is curable at room temperature. For example, as described in JP-A-64-67308, alkenyl group-containing polydiorganosiloxane gum and silicon-bonded hydrogen atom-containing poly It is preferable to use a rubber material containing at least an organosiloxane and a platinum-based catalyst.

After the rubber material inside the first hollow portion 5 has hardened, a rubber mold 31 conforming to the internal shape of the first hollow portion 5 can be manufactured.
Is embedded, and the support pin 13 extends outward from one side. After releasing the rubber mold 31 from the first frame portion 2, the rubber mold 31 is set inside the second empty portion 42 of the second frame portion 41.

The above-mentioned second frame portion 41 is constructed by combining a first mold material 43 facing each other and a second mold material 44 facing each other by tightening with left and right fastening bolts 45. Thus, a second void portion 42 having an open top and a bottom is formed in a portion surrounded by the first mold material 43 and the second mold material 44. Since the conical frame member 46 is provided on the inner surface of the center of the one first mold member 43 described above, and the insertion hole 47 is opened in the frame member 46, the support pin 13 of the rubber mold 31 is inserted into the insertion hole. By mounting the rubber mold 31 on the 47, the rubber mold 31 is positioned substantially in the center of the second empty space 42. Then, at a proper position inside the second empty portion 42, for example, at four corners, if the position regulating pin 48 that is shorter than the height of the second empty portion 42 and longer than half the height is erected. A rubber material is supplied to the lower half portion of the second empty portion 42 to be cured to some extent. The above rubber material is a rubber mold 3
It is not necessary to use an expensive rubber material obtained by molding 1 and rubber of an appropriate material that does not adhere to the rubber mold 31 can be used. Further, the space reducing block 49 can be housed inside the second empty portion 42 to form an internal space corresponding to the size of the rubber mold 31.

When the above-mentioned rubber material is cured to some extent, it becomes the lower outer frame body 51. In this lower outer frame body 51, the lower half portion of the rubber mold 31 and the frame material 46 is embedded, and at each position. A part of the regulation pin 48 projects from the upper surface. Therefore, a release agent is applied to the upper surface of the lower outer frame body 51 and the protruding portion of the position regulating pin 48, and the upper half portion of the second empty portion 42 is made of the same rubber material as the lower outer frame body 51. Is supplied and cured to form the upper outer frame body 52.

Therefore, since the rubber mold 31 is surrounded from above and below by the lower outer frame body 51 and the upper outer frame body 52 described above,
When the lower outer frame body 51 and the upper outer frame body 52 are sufficiently hardened, they are released from the second frame portion 41, and the lower outer frame body 51 and the upper outer frame body 52 are vertically separated to separate the support pins 13. Take out. In this case, the lower outer frame body 51 and the upper outer frame body 52 are not adhered to each other by a release agent, and the position regulating pin 48 partially embedded in the upper outer frame body 52 is also outside the upper side by the release agent. Frame 52
Since it can be easily separated from, the lower outer frame body 51 and the upper outer frame body 52 can be easily separated. Then, on the joint surface of the lower outer frame body 51 and the upper outer frame body 52, a first recessed portion 53 of a half portion of the rubber die 31 formed by taking out the rubber die 31 and a first recessed portion of the half portion of the frame member 46 are formed. The two lower recesses 54 are formed, and the separated lower outer frame body 51 and upper separated outer frame body 52 are provided with a plurality of position regulating pins 48.
By this, it is possible to join them in a polymer state by accurate alignment.

The rubber mold 31 taken out from the lower outer frame body 51 and the upper outer frame body 52 is cut in the state of an irregular surface in the lateral direction, and is embedded inside the master model 1.
When 1 is taken out, the cut surfaces are matched with each other and the rubber mold 31 having the void portion of the master model 11 therein is assembled. When the above rubber mold 31 is housed inside the lower outer frame body 51 and the upper outer frame body 52, the second recess 54 and the void inside the rubber mold 31 communicate with each other, so the lower outer frame body 51
The second recess 5 while firmly pressing the upper outer frame 52 with the upper outer frame 52.
Insert the wax press-fitting device (not shown) nozzle into 4,
Wax is pressed into the cavity of the rubber mold 31 to cure it.
When the rubber mold 31 is divided from the cut surface when the above wax is hardened, a wax mold having the same shape as the void portion of the rubber mold 31 (the shape of the model portion 12 of the master model 11) can be manufactured. Therefore, as in the conventional case, the above wax mold is embedded in the sand mold, and the molten metal is injected to eliminate the above wax mold to manufacture a metal product having the same shape as the wax mold.

The above-mentioned wax mold is one in which a rubber mold 31 is divided or combined to form a large number of lower outer frame members 51 and upper outer frame members 52. A large number of wax molds are buried in a sand mold to form a large number of metal products. May be manufactured simultaneously. In addition, when a large number of wax molds are formed, the positioning accuracy of the cut surface of the support pin 13 may decrease, and the overlapping position of the lower outer frame body 51 and the upper outer frame body 52 may become incorrect. Therefore,
Positions of the rubber mold 31, the lower outer frame body 51, and the upper outer frame body 52 are provided by penetrating the lower outer frame body 51 and the upper outer frame body 52 with straightening bolts 55 in the lengthwise direction and tightening 55. The accuracy may be increased.

The present invention has been described above based on the embodiments of the drawings, but the present invention is not limited to the above-mentioned embodiments, and can be carried out in any manner as long as the configuration described in the claims is not changed. can do.

[0017]

In summary, according to the present invention, the master model and the rubber material containing silicon as a main component are housed in the first vacant portion in which the dimension of the divisible first frame portion can be changed, A rubber mold in which the master model is embedded is manufactured by pressurizing the above rubber material, and the above rubber mold released from the first frame part is set in the second empty part of the second frame part. ,
The lower outer frame body is molded by supplying a rubber material to the lower half portion of the above-mentioned second hollow portion and hardening it, and when the above-mentioned lower outer frame body is hardened to some extent, the upper half of the second empty portion The upper outer frame body is molded by supplying a rubber material to the portion and curing the same, and when the lower and upper outer frame bodies are cured, the lower outer frame body and the upper outer frame body are released from the second frame portion. By separating the body and separating both outer frames, the rubber mold facing the front side is cut up and down in an irregular state, the master model inside the rubber mold is taken out, and the master model is inside the rubber mold. To form a wax mold having the same shape as the master model by housing the above-described rubber mold inside the outer frame body, press-fitting the wax into the rubber mold void, and curing the wax. It is characterized by having done. Therefore, it is possible to minimize the amount of expensive silicon-based rubber used when molding the rubber mold, which significantly increases the economic value. Further, since the rubber mold is surrounded by the outer frame, the accuracy of the inner void portion is significantly increased, and a wax mold having a uniform shape can be formed, and even if the metal product has a complicated shape. It can be reliably molded and has high practical value.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a first frame portion and a block used in the present invention.

FIG. 2 is a vertical sectional side view showing a state where a rubber mold is molded.

FIG. 3 is a plan view of the above.

FIG. 4 is an exploded perspective view of a rubber mold and a second frame portion.

FIG. 5 is a vertical cross-sectional view of a state where the outer frame body is molded.

FIG. 6 is a plan view of the above.

FIG. 7 is a perspective view of a rubber mold, a lower outer frame body, and an upper outer frame body in a disassembled state.

FIG. 8 is a perspective view of the above-mentioned assembled state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wax type manufacturing apparatus 2 1st frame part 3 Frame body 5 1st empty part 11 Master model 12 Model part 13 Support pin 21 1st block 31 Rubber type 41 2nd frame part 42 2nd empty part 51 lower outer frame 52 upper outer frame

Claims (3)

[Claims] 1. A master model and a rubber material containing silicon as a main component are housed in a first vacant portion in which the dimensions of the first frame portion that can be divided are changeable, and the above rubber material is pressurized. A rubber mold having an embedded master model is manufactured, and the above-mentioned rubber mold released from the first frame part is set in the second empty part of the second frame part, and the second empty part described above is set. The lower outer frame body is molded by supplying a rubber material to the lower half portion and curing the same, and when the lower outer frame body is cured to some extent, the rubber material is supplied to the upper half portion of the second empty portion. Then, the upper outer frame body is molded by curing the upper outer frame body, and when the lower and upper outer frame bodies are cured, the second outer frame portion is demolded to separate the lower outer frame body and the upper outer frame body. By separating the outer frame, the rubber mold facing the front side is cut up and down in an irregular state, and the master model inside the rubber mold is cut. The master is formed by taking out the rubber and forming a void inside the rubber mold by the master model, storing the above rubber mold inside the above-mentioned outer frame, press-fitting wax into the void of the rubber mold, and curing it. A method for manufacturing a wax mold for molding a metal product, characterized in that a wax mold having the same shape as the model is manufactured. 2. The production of a wax mold for metal product molding according to claim 1, wherein a plurality of blocks are accommodated and installed in the first empty portion of the first frame portion so that the internal dimension can be changed. Method. 3. A dividable first frame portion having a dimension changeable first empty portion, a master model and a rubber material housed inside the first empty portion, and a master model and a rubber material. And a lower outer frame body and an upper outer frame body, which are molded by the above-mentioned second hollow portion, respectively. Wax mold manufacturing equipment for molding metal products.