JP2006096645A - Glass ocarina, its manufacturing method and molding mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel glass ocarina where shrinkage at molding and baking is suppressed and where the variations of a musical interval and a tone color are reduced, its manufacturing method and a molding die. <P>SOLUTION: A wax prototype for the ocarina is made by using wax which is the mixture of a paraffin and beeswax. Refractory gypsum is mixed with water in a molding box having a needed size. The wax prototype for the ocarina is sunk in it before hardening and a refractory gypsum mold 4 is taken out after hardening. The wax prototype for the ocarina is melted in hot water and then a gypsum mold for shaping at firing is obtained. The refractory gypsum mold 4 is used for manufacturing the glass ocarina. Glass is fired together with the refractory gypsum mold 4 in a firing furnace and molded. The glass ocarina 5 is taken out by crushing the refractory gypsum mold after firing, polished and completed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a glass ocarina, a manufacturing method thereof, and a manufacturing mold.

  There are various glass molding techniques, but no ocarina has ever been made of glass.

  Ocarina used as a musical instrument is mainly made of ceramic. In ceramic ocarina, the shrinkage that occurs during drying of the clay after molding and the shrinkage that occurs during firing cause the shrinkage after firing to be around 6% to 15% compared to that during molding. As a result, the pitch or timbre changes, and therefore, in the production of a plurality of ocarinas, it becomes a unified timbre or timbre management. It was very bad to make.

  Also, even if it is a mass-produced ceramic ocarina, when playing with multiple ocarina, it may be difficult to find a musical instrument that matches the pitch and tone when purchased at different times. This is due to the shrinkage of the porcelain that occurs between molding and firing, even when a uniform mold is used as in a mass production manufacturer.

  The above shrinkage is considered to be caused by the raw material of porcelain clay, moisture in the raw material, temperature control during firing, and the like. An object of the present invention is to provide an unprecedented glass ocarina that suppresses shrinkage during firing from the above molding and reduces changes in pitch and tone, a manufacturing method thereof, and a manufacturing mold.

  In order to achieve the above-mentioned purpose, an ocarina wax prototype having the function of ocarina is created with a mixture of paraffin and beeswax that is sufficiently shaped, and the part that becomes the glass inlet during firing is a mixed wax of paraffin and beeswax. And attach it to an appropriate place on the Ocarina wax pattern. Next, the ocarina wax prototype is housed, and the refractory gypsum is dissolved in a mold having the required size, and the ocarina wax prototype is submerged so that no air remains in the internal cavity of the ocarina wax prototype before solidifying, The fire-resistant gypsum mold is taken out from the mold after the fire-resistant gypsum is solidified in a state where the glass inlet is partially raised from the water-soluble fire-resistant gypsum. Thereafter, the refractory gypsum mold is poured into a hot water bath to melt the ocarina wax pattern, and a refractory gypsum mold for glass ocarina firing is provided with an ocarina-shaped cavity inside.

  Next, the glass ocarina fire-resistant gypsum mold for firing is placed in an electric furnace or firing kiln, heated to a temperature of around 900 degrees, and powdered or granular glass is put into the mold and fired. The temperature is gradually lowered by temperature control suitable for the glass, the glass ocarina is taken out from the fire-resistant gypsum mold for firing, and the excess portion remaining at the glass inlet is scraped to complete the glass ocarina.

  In the case where the refractory gypsum mold for glass ocarina fired molding is constituted by the four-part mold according to claim 2, the upper half body type, the lower half body type, the core type, and the window ray part type are combined, and each of them is a fitting structure. It is a process of providing a shape cavity and covering the outside of the mold with refractory gypsum to prevent decomposition, and does not require an ocarina wax pattern.

  There are various glass molding techniques, but until now there was no ocarina made of glass, and it is possible to enjoy the original color, transparency, and texture of glass with the instrument ocarina. Ocarina that has never existed can be produced by using a visual design expression in the cavity inside Ocarina.

  When the glass ocarina is manufactured by the method of the present invention, the refractory gypsum is gradually lowered after firing by using the glass ocarina refractory gypsum mold of FIG. 1 in which the thickness of the refractory gypsum is changed. By reducing the temperature of the glass from the thin lower side, the shrinkage portion of the glass can be brought out to 7 in FIG. 1 according to the flow characteristics of the glass at the time of shrinkage, and the shrinkage of the glass does not occur in the ocarina-shaped cavity forming the ocarina body. Absent.

  In addition, the characteristics of the glass were considered even when the glass ocarina fire molding gypsum mold having a uniform thickness was used on the outside of the glass ocarina fire molding gypsum mold with the thickness of the refractory gypsum changed in FIG. When the temperature is gradually lowered by the temperature control, if the temperature control inside the firing kiln can be gradually lowered from the lower side, the shrinking portion of the glass can be brought out to 7 in FIG.

  When fired at a temperature of about 900 degrees, the shrinkage of the refractory gypsum is about 3 percent, and the shrinkage after firing is suppressed to one-half to one-fifth compared to ceramic ocarina. Moreover, as described above, the range of error of expected shrinkage is about 6% to 15% for ceramic ocarina, and the reason for the shrinkage is due to the raw material of porcelain as described above, moisture in the raw material, Due to the overlap of unstable factors such as temperature control, the glass ocarina of the present invention may be manufactured considering only the shrinkage of refractory gypsum during firing, and the pitch and tone after firing compared to ceramic ocarina. It is possible to produce a stable ocarina with little change.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a fire-resistant gypsum mold after firing, FIG. 2 is a perspective view of an original ocarina wax mold, FIG. 3 is a perspective view of a fire-resistant gypsum mold showing the manufacturing process, FIG. The figure is a sectional view of a split type.

  Ocarina has an internal cavity in the resonance body, and the internal cavity is connected to the outside by tone holes, sheds, and window rays. The ocarina of the present invention is the most common ocarina shape, but need not be limited to such a shape.

  The manufacturing method of the refractory gypsum type | mold for glass ocarina firing of Claim 1 is demonstrated. In order to have ocarina-shaped cavities with refractory gypsum, the ocarina wax prototype with the function of ocarina is created with paraffin and beeswax, using the method of producing ocarina without using molds with porcelain clay, and then glass injection The part to be part is made with paraffin and beeswax. It is joined to the ocarina wax pattern to form the shape shown in FIG.

  Next, the ocarina wax prototype shown in Fig. 2 is housed, and the refractory gypsum is dissolved in a mold having the required size. Before solidifying, the ocarina wax prototype is submerged with no air remaining in the internal cavity. FIG. 3 is a cross-sectional view showing only the mold in a state where the refractory gypsum is solidified in a state where a part of the glass charging portion 2 is raised at the time of glass firing and the refractory gypsum mold is taken out from the mold frame. Taking this into consideration, heat-resistant gypsum is scraped off in consideration of the thermal efficiency at the time of firing. A type.

  Next, after fully drying the glass ocarina fire-molding refractory plaster mold, set it in a kiln capable of temperature control such as an electric kiln or gas kiln for firing, Heat at a suitable temperature rise with the lid of the kiln slightly opened until a small amount of wax is completely lost, then close the lid of the kiln and heat at a suitable temperature rise to about 900 degrees Celsius. To do.

  After that, the temperature in the kiln is raised to about 900 ° C., the temperature at which the glass is charged, and after waiting for about 1 hour until the heat is sufficiently transmitted to the refractory gypsum mold for firing ocarina made of glass, Glass is put into a refractory gypsum mold for glass ocarina firing. At this time, if there is little glass to be introduced, it will not be established as a work, so the glass 6 that has been put in slightly more than planned and solidified at the opening is cut off in a later step. It should be noted that the temperature and time at which the glass is introduced vary depending on the size of the refractory gypsum mold for firing ocarina made of glass and the glass used.

  After the glass is put into the glass ocarina fire molding gypsum mold, the temperature is gradually lowered by temperature control considering the characteristics of the glass. . FIG. 1 shows a sectional view of only a fire-resistant gypsum mold after firing after removing excess portions of the fire-resistant gypsum in a form suitable for a firing mold considering thermal efficiency during firing, and a state of glass ocarina after firing.

  The fire-resistant gypsum after firing becomes weak and weak, so it easily dissolves in water, so the refractory gypsum inside the ocarina begins to dissolve using water. After that, the hardened glass is cut off at the glass input opening, and the entire ocarina is polished and completed.

  It is also possible to omit the step of melting the ocarina wax prototype by applying the hot fire gypsum mold for calcination firing of glass ocarina before the firing, and burning the ocarina wax prototype in a firing kiln. It is also possible to make the ocarina prototype from a synthetic resin that evaporates by combustion instead of paraffin and beeswax materials.

  Next, a glass-made ocarina fire-resistant gypsum mold comprising four parts of an upper half body type, a lower half body type, a core type, and a window ray part type, which does not require an ocarina wax prototype, together with drawings explain.

  The tone hole convex part 16 of the core mold 15 is manufactured to be several millimeters longer than the actual tone hole, and the depth of the extra part is formed in the tone hole concave part 9 of the upper half mold 18 and the lower half mold 8. The tone hole convex 16 of the core mold 15 is fitted into the tone hole recess 9 of the lower half mold 8, and the core mold 15 is installed on the lower half mold 8, and the core mold window window is fitted into the core mold 15. The window ray mold 14 is fitted and installed in a bridging state between the mating recess 17 and the blowout window ray fitting recess 12 of the lower half mold 8. In this state, the upper half body 18 is covered. At this time, the tone hole convex part 16 of the core mold 15 and the tone hole concave part 9 of the upper half mold 18 are fitted together, and the upper mold window window fitting concave part 11 and the blowing window are sandwiched between the window ray part mold 14. The Ocarina-shaped cavity is completed by fitting and fixing in a state of being covered from above by the ray-fitting recess 12. FIG. 5 is a cross-sectional view of a state in which FIG. 5 is combined with the upper half body type, the lower half body type, the core type, and the window ray part type split mold.

  Next, the combined refractory gypsum mold is wound with several wires to prevent decomposition during firing, the refractory gypsum mold is wetted with water to improve the adhesion of the water-soluble refractory gypsum, and the water-soluble refractory gypsum is suitable for the entire mold. Cover with thickness and dry to make a refractory gypsum mold for glass ocarina firing. Note that a wire for preventing decomposition during firing need not be used if the strength during firing is sufficient.

  Subsequent firing is the same as when using the ocarina wax pattern. After firing, the glass may enter and solidify into the fitting part or the mating part, but it is in a position where it can be scraped and polished.

  Refractory gypsum mold cross-sectional perspective view after firing   Ocarina wax pattern perspective view   Fireproof gypsum mold cross-sectional perspective view showing the manufacturing process   Split type perspective view   Cross section of split type

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ocarina wax pattern 2 Glass casting part wax pattern 3 Tone hole 4 Refractory gypsum 5 Glass ocarina 6 Glass hardened at the loading opening 7 Shrinkage part of glass 8 Lower half body type 9 Tone hole part 10 Hook part 11 Upper mold hole Window ray fitting recessed part 12 Blow-out window ray fitting recessed part 13 Glass insertion part 14 Window ray part type 15 Core type 16 Tone hole convex part 17 Core type glazed window ray fitting concave part 18 Upper half body type 19 Positioning concave part 20 Positioning convex part 21 Ocarina-shaped cavity

Claims (4)

  It is a refractory gypsum mold used to mold ocarina, which is made of glass. The ocarina wax prototype with the function of ocarina is created using a mixed wax of paraffin and beeswax, and the ocarina wax prototype is filled with glass when the glass is fired. The part that becomes the opening is made with paraffin and beeswax, joined to the ocarina wax prototype, the ocarina wax prototype is contained, and the refractory gypsum is dissolved in the mold having the required size before it is solidified and solidified before the ocarina wax prototype The refractory gypsum is solidified in a state where a portion of the glass input portion is raised when the glass is fired, and the refractory gypsum mold is solidified, and the refractory gypsum mold is taken out of the formwork and is suitable for the firing mold. In order to make it, the excess portion of refractory gypsum is scraped off, and the ocarina-shaped hollow portion is provided inside by baking it in a water bath to melt the ocarina wax pattern. Fireproof plaster mold for the form.   It is a refractory gypsum mold used for molding ocarina whose main body is made of glass. It is divided into four parts: upper half, lower half, core, and window ray, upper half and lower half. A concave portion is provided in the tone hole portion, a glass charging portion is provided, and a concave portion in which a part of the window ray portion mold is fitted is provided on the window ray outlet side. A recess is provided in which the window ray type part is fitted into the upper half type mouth opening. The core type that has the shape of the cavity inside the ocarina has a convex part that fits into the tone hole part of the upper half type and the lower half type, and a part of the window ray part type is in the mouth part of the upper half type A recess to be fitted is provided. A combination of upper half body type, lower half body type, core type, and window ray part type, and a refractory plaster mold for glass ocarina fired molding that covers the outside of the mold with refractory plaster to prevent decomposition and has an ocarina shaped cavity inside. .   A glass ocarina manufactured using the method according to claim 1.   A method for producing glass ocarina using the refractory gypsum mold according to claim 1.

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