JP2005088076A - Method for producing noble metal ornament - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for precisely and firmly fitting an ornamental body to a prescribed position of a main body, in a method for producing a noble metal ornament fitting the ornamental body composed of a second noble metal, such as a gold, to the main body composed of a first noble metal, such as a silver. <P>SOLUTION: The ornamental body 30 with the gold is cast by molding from a recessed part 10' formed in a wax pattern 10 for main body, and the ornamental body 30 after casting, is fitted to the recessed part 10' of the wax pattern 10 for main body used for molding the ornamental body 30 and the casting with the silver is performed with a lost wax method, and when the casting with the silver is performed with the lost wax method, the ornamental body 30 is held by engaging with a buried material 34 by using a supporting part 30". The ornamental body 30 of the gold can precisely be positioned to the prescribed position to the main body 40 of the silver, and the main body 30 and the ornamental body 40 can perfectly be matched. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a noble metal decorative article in which a decorative body made of a second noble metal such as gold is mounted or embedded in a main body made of a first noble metal such as silver.

  Some precious metal ornaments such as rings have a decorative body such as gold (second precious metal) embedded in a main body formed of silver or the like (first precious metal). When casting such a precious metal ornament, a wax model of the precious metal ornament integrated with a decorative body formed of the second precious metal is manufactured and set in an investment material filled in a mold. Then, by incinerating wax by heating, injecting silver into the cavity formed by incineration, and solidifying by cooling, a precious metal ornament with a gold ornament embedded in the silver body (base) was obtained. (See Patent Document 1).

JP-A-6-277793

  In the technique of Patent Document 1, in order to manufacture a wax model of a noble metal ornament in which the ornament is integrated, the ornament is mounted in a rubber mold for molding the wax model of the noble metal ornament, and the wax is filled and solidified. A wax model of precious metal ornaments with a decorative body was manufactured. However, in this case, it is difficult to accurately position the decorative body with respect to the wax model. Therefore, the accuracy of the finished precious metal decorative product is not good, and the appearance is adversely affected. Moreover, the fixing state of the decorative body with respect to the main body (base) was poor, and peeling was likely to occur.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for accurately and firmly mounting a decorative body at a predetermined position of a main body.

  According to the first aspect of the present invention, in the method of manufacturing a noble metal ornament, in which a main body made of the first noble metal is mounted with a decorative body made of the second noble metal, (a) the surface of the wax model of the main body A concave portion complementary to the shape of the decorative body is formed thereon, (b) a wax model of the decorative body is formed by taking a mold with respect to the concave portion, and (c) a lost wax method from the wax model of the decorative body. To form a second noble metal decorative body, and (d) then attach the decorative body to the recess of the wax model of the main body and fill the surroundings with the investment material and heat to remove the wax by incineration and removal. By engaging and holding the investment material, and (e) filling the cavity formed by the wax removal with the melted first noble metal, the main body made of the first noble metal is attached to the main body made of the second noble metal or Precious metal ornaments that are buried Method for producing a noble metal decoration, characterized by granulation is provided.

  According to the second aspect of the present invention, in the first aspect of the invention, when the decorative body is mounted in the concave portion of the wax model of the main body in the step (a), the powder is applied to the boundary surface between the decorative body and the concave portion. In the step (c), a continuous or granular retention agent is applied, and when the wax is incinerated by heating in the subsequent step (c), the retention agent is also incinerated so as to give minute irregularities to the decorative body at the interface. A method for producing a noble metal ornament is provided.

  According to the invention described in claim 3, in the invention described in claim 1 or 2, in the step (b), when forming the wax model of the decorative body, the supporting portion is formed to extend from the concave portion to the side away from the concave portion. Thus, by passing through the subsequent steps (b) and (c), a decorative body having an integrated support portion on the back surface is obtained, and the support portion is engaged and held in the investment material in step (d). There is provided a method for producing a noble metal ornament characterized by the above.

  The operation and effect of the invention of claim 1 will be explained. The wax of the main body used to mold the decorative body by casting the decorative body from the second noble metal by molding from the recess formed in the wax model of the main body. The decorative body after casting is attached to the concave portion of the model, and casting with the first noble metal by the lost wax method is performed, and the decorative body is engaged and held with the investment during the casting with the first noble metal by the lost wax method. Therefore, the decorative body (second noble metal) can be accurately positioned at a predetermined position with respect to the main body (first noble metal), and the main body and the decorative body can be perfectly matched.

  The operation and effect of the invention of claim 2 will be described. When the main body is cast with the first noble metal, the first noble metal flows into and solidifies into the minute irregularities formed on the decorative body made of the second noble metal. Therefore, a strong joined state between the main body and the decorative body can be obtained.

  The operation and effect of the invention of claim 3 will be described. Since the integral support portion on the back surface of the decorative body is engaged with the investment material during casting with the first noble metal, the decorative body is supported by the support portion during casting. Can be reliably supported by the solidified embedding agent.

  In the present invention, a decorative body made of gold (including a gold alloy) as a second noble metal is attached to the front surface of an annular arm (main body) made of silver (including a silver alloy) as the first noble metal. An embodiment applied to the production of a ring will be described. In FIG. 1 (a), 10 is a model of an annular arm formed of wax (in this embodiment, dental inlay wax, for example, commercially available under the trade name Mighty Wax from Matsukaze Co., Ltd.). Indicates. The wax is clay-like in nature and may be molded by pure manual operation or molded by molding.

  In the next step (b), a concave portion 10 ′ having a shape complementary to the decorative body is formed on the front surface of the annular arm model 10. Although the concave portion 10 'is illustrated as a simple shape for the sake of simplicity, it can actually take various shapes, for example, it can be a concave shape according to various characters and patterns, and can be a sword-like tool. The concave shape can be engraved by using the like.

  In step (c), a mold material 14 made of a flexible rubber (in this embodiment, an additional silicon impression material, for example, commercially available under the trade name Dent Silicon from Matsukaze Co., Ltd.) is used as the annular arm model 10. The pressing / molding material 14 is bitten into the concave portion 10 ′ of the annular arm model 10 to form a convex portion 14 ′ corresponding to the shape of the concave portion 10 ′.

  In the step (d), the plaster mold 16 having the concave portions 16 ′ having a shape corresponding to the convex portions 14 ′ is formed by pouring gypsum into the molding material 14 in which the convex portions 14 ′ are formed.

  In steps (e) and (f), the molten wax 18 is hung in the recess 16 'of the gypsum mold 16 to form a shape corresponding to the recess 16', and the back side is formed into a convex bar shape. As a result, a model 20 corresponding to the shape of the decorative body can be obtained, and the decorative body model 20 integrally has a support bar portion 20 'on the back surface thereof.

In the step (g), an adhesive is applied to the inner surface side of the decorative body model 20 and the powder or granular material 22 is sprayed on the adhesive application surface to form an uneven surface on the inner surface of the decorative body model 20. The powder or granule 22 needs to have a particle size of about 150 μm and can be incinerated by heating, and is made of a synthetic resin such as a particle size of 150 μm used for crown restoration in dental treatment. Can be employed (so-called retention beads).
In the stage (H) shown in FIG. 2, the decorative body model 20 is planted and held on the base 26 fixed to the lower end of the mold 24 at the support portion 20 ′. The mold 24 is filled and solidified with a gypsum-based investment material 26. As the gypsum-based investment material 26, a material used for a gold crown in a dental technician (for example, a material marketed under the trade name of Matsukaze Christo 21 from Matsukaze Co., Ltd.) can be used. The mold 26 filled with the investment material is heated to a temperature of 700 ° C., and the decorative body model 20 made of wax disappears by heating, and becomes a mold 28 having a cavity corresponding to the shape of the decorative body model 20. The surface 28 ′ of the mold 28 corresponding to the surface of the decorative body model 20 to which is applied has an uneven shape.

  In the step (1), the mold 28 is filled with the molten gold or gold alloy G with the cavity 28 'facing upward.

  Step (nu) shows a state in which the gold or gold alloy is cooled, and a gold casting (decorative body) 30 is obtained.

  In stage (L), the unnecessary portion 30 ′ is cut off from the decorative body 30 by the cut line L 1, (W) shows the final decorative body 30 after casting, and a support portion 30 ″ is formed on the back surface. Further, the surface 30A of the decorative body 30 that has been in contact with the mold 28 has a minute uneven state.

  Next, moving to FIG. 3, in the stage (W), the decorative body 30 obtained in the stage (W) is placed in the concave portion 10 ′ of the annular arm model 10 made of the wax used in the stages (B) and (C). The uneven surface 30A is mounted so that the bottom surface of the recess 10 'is in close contact. On the other hand, a support portion 31 is adhered and formed on the peripheral surface of the annular arm model 10 facing the decorative body 30 with wax.

  In the step (f), the ring-shaped arm model 10 made of wax with the decorative body 30 is placed upright on the base 26 of the mold 28 on the side away from the decorative body 30 via the support portion 31, and the gypsum-based investment material 34 is placed. Fill and solidify. Then, the mold 26 filled with the investment material 34 is heated to a temperature of 700 ° C., and the wax constituting the annular arm model 10 is lost by the heating, and a mold 36 having a cavity corresponding to the shape of the annular arm model 10 is obtained. The decorative body 30 has its supporting portion 30 ″ embedded in the mold 36. Therefore, the decorative body 30 can be securely held at a predetermined position in the mold 36. The molten silver S is in the mold 36. It is injected into the cavity 36 '.

  Step (T) shows a state in which the injected silver S is solidified to form a casting 40. The gold decorative body 30 is integrally incorporated in the silver casting 40, and the silver melts into the uneven surface 30 'of the decorative body 30. Therefore, a strong bonded state of the gold decorative body 30 to the silver casting can be obtained. Then, the unnecessary portion 40 ′ of the casting 40 is cut by the cut line L 2, and the support portion 30 ″ of the decorative body 30 plays a role and becomes an unnecessary portion and is cut off by the cut line L 3.

  Stage (Le) shows the completed state as a ring.

FIG. 1 is a diagram showing steps (a) to (g) in the casting method of the present invention. FIG. 2 is a diagram showing steps (h) to (v) subsequent to FIG. FIG. 3 is a diagram illustrating steps (a) to (l) subsequent to FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Wax type | mold 14 ... Rubber | gum 16 ... Plaster type | mold 20 ... Decoration body model 22 ... Retention bead 24 ... Formwork 26 ... Base 28 ... Mold 30 ... Decoration body 30 "... Support part 31 ... Support part 36 ... Mold 40 ... Casting
L1, L2, L3 ... cut line

Claims (3)

In a method for manufacturing a noble metal ornament, comprising a main body made of a first noble metal and a decorative body made of a second noble metal, and (a) a concave portion complementary to the shape of the ornament on the surface of the wax model of the main body. (B) forming a wax model of the decorative body by taking a mold with respect to the recess, and (c) forming a second noble metal decorative body from the wax model of the decorative body by a lost wax method. (D) After that, the decorative body is attached to the concave portion of the wax model of the main body, and the surrounding body is filled with the investment material and then heated, and the wax is incinerated to hold the decorative body in engagement with the investment material, (e) A first noble metal melted in a cavity formed by removing the wax is filled with a first noble metal main body, and a second noble metal decorative body is mounted on a main body made of the first noble metal. Manufacture of precious metal ornaments Law. In the invention according to claim 1, when attaching the decorative body to the concave portion of the wax model of the main body in the step (a), a powdery or granular retention agent is applied to the boundary surface between the decorative body and the concave portion. A method for producing a noble metal ornament, characterized in that fine irregularities are applied to the decorative body at the interface by incinerating the retention agent at the time of incineration of the wax by heating in the subsequent step (c). In the invention according to claim 1 or 2, in the step (b), a support part is extended and formed on the side away from the concave part when forming the wax model of the decorative body, whereby the subsequent steps (b) and ( A noble metal ornament characterized in that, in step (d), the support part is engaged and held in the investment material so as to obtain a decorative body integrally having a support part on the back by passing c). Manufacturing method.

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