Casting molding method of thin aluminum alloy sculpture

Abstract

The invention relates to the technical field of sculpture products, in particular to a casting molding method of a thin aluminum alloy sculpture, which comprises four steps of preparing an outer mold and an inner mold, casting, demolding and molding, and reusing. The quartz sand and the sodium bentonite are adopted as main components, the shaped mold has the characteristics of thermal shock resistance and abrasion resistance, the structure is more stable and not prone to deformation after high-temperature firing of an incinerator, chemical corrosion can be effectively resisted in the diluted hydrochloric acid soaking treatment process, and the integrity and air permeability of the mold are kept. The added silicon oxide porous microspheres can further improve the air permeability of the mold, and the silicon oxide porous microspheres and the aluminum oxide short fibers can reduce the surface tension of the surface of the mold and the aluminum alloy melt and improve the wettability of the aluminum melt, so that the obtained thin aluminum alloy sculpture has more obvious details; and the aluminum oxide short fiber can also form a fiber composite material with other components, so that the anti-cracking performance of the mold is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sculpture products, and particularly relates to a casting forming method of a thin aluminum alloy sculpture. BACKGROUND

[0002] Aluminum sculptures have characteristics different from stone sculptures or cement sculptures due to the characteristics of aluminum alloy itself, such as easy forming, light weight (hollow structure), recyclability and the like. However, the metal sculptures such as aluminum sculptures are usually prepared by casting method, which needs to prepare a casting mold with precise shape on one hand, and has the problem of unclear sculpture product shape due to insufficient casting on the other hand.

[0003] Chinese patent CN 109759543 A discloses a copper casting sculpture casting production method, which selects 62 brass as a casting raw material. The 62 brass has strong strength, sufficient hardness and good plasticity, is not easy to produce segregation and loose phenomenon, and has good welding performance, so as to ensure the production quality of the copper sculpture. However, the copper casting sculpture production method of the present application patent is too complex, and the mold cannot be used again after being used once, so the production efficiency is low and the cost is high. SUMMARY

[0004] In view of the problem that the casting mold of the existing metal casting sculpture is complicated to prepare and cannot be reused, the present application provides a casting forming method of a thin aluminum alloy sculpture, which comprises the following steps: 1) preparing an outer mold and an inner mold The following components are weighed according to the following proportions: quartz sand 50-80 parts, sodium-based bentonite 20-40 parts, silica porous microspheres 10-30 parts, pig iron powder 10-30 parts, water glass 10-20 parts, alumina short fibers 5-20 parts and rosin resin powder 5-10 parts. After being uniformly stirred with water, the obtained mixture is respectively poured into the designed outer mold and inner mold for shaping. After demolding, the obtained mold blank is burned and shaped in a burning furnace, and then annealed after being cooled to room temperature. Then, the mold blank is soaked in flowing dilute hydrochloric acid, and then washed with water and dried. The obtained mold blank is detected for uniformity of air permeability, so as to obtain the outer mold and the inner mold. 2) casting The inner cavity surface of the outer mold obtained in step 1) and the outer surface of the inner mold are coated with silicon oil and then spliced, so as to combine a casting cavity. The molten aluminum alloy is slowly poured into the casting cavity from the bottom casting hole, and the air suction pipe is inserted into the inner mold to exhaust the smoke. 3) demolding and forming After the pouring of the molten aluminum alloy is completed, the mold is demolded after natural cooling, so as to obtain a sculpture blank. After the sculpture blank is polished, the thin aluminum alloy sculpture is obtained. 4) repeated use The outer mold and the inner mold after demolding in step 3) are soaked in the dilute hydrochloric acid in step 1) again, and after water washing and drying, the air permeability uniformity is detected, and the thin aluminum alloy sculpture is prepared again.

[0005] The casting forming method of the thin aluminum alloy sculpture adopts quartz sand and sodium-based bentonite as main components, and the mold after shaping has the characteristics of heat shock resistance and wear resistance, and after high-temperature firing in a calcining furnace, the structure is more stable and not easy to deform, and in the dilute hydrochloric acid soaking process, the quartz sand and sodium-based bentonite can effectively resist chemical corrosion and maintain the integrity and air permeability of the mold. The added porous silica microspheres can further increase the air permeability of the mold, and the porous silica microspheres and the alumina short fibers can reduce the surface tension of the mold surface and the aluminum alloy molten liquid, improve the wettability of the aluminum liquid, and make the details of the obtained thin aluminum alloy sculpture more obvious. In addition, the alumina short fibers can also form a fiber composite with other components to increase the anti-cracking performance of the mold.

[0006] In step 1) of the present application, the water glass acts as an adhesive to bond the components, so that the mold blank remains stable in shape during calcination, and the added pig iron powder melts during calcination to bond and shape the other components. In the flowing dilute hydrochloric acid, the sharp edges of the pig iron and the pig iron blocking the pores of the porous silica microspheres can be dissolved, ensuring the air permeability of the outer mold and the inner mold, and at the same time, the outer mold and the inner mold can maintain good air permeability uniformity after repeated use, ensuring the quality stability of the sculpture product, reducing the production cost, and being beneficial to resource saving and environmental protection.

[0007] Specifically, in step 1), the temperature of the calcining furnace is 1300-1500℃; the annealing treatment is: at room temperature, the temperature is raised to 900℃ at a rate of 3-5℃ / min, and then the temperature is lowered to room temperature at a rate of 3-5℃ / min after holding for 30-60min. The mass fraction of dilute hydrochloric acid is 10%-15%, the flow rate is 1-3m / min, and the soaking time is 10-30min. BRIEF DESCRIPTION OF DRAWINGS

[0008] Fig. 1 It is a longitudinal sectional view of the casting mold of the present application.

[0009] Fig. 2 It is a three-dimensional schematic view of the casting mold of the present application.

[0010] Fig. 3 It is a three-dimensional schematic view of the outer mold.

[0011] The numbers are respectively: 1, outer mold, 2, ring table, 3, inner mold, 4, flange, 5, casting cavity, 6, casting hole, 7, exhaust cavity. DETAILED DESCRIPTION

[0012] The present application is described below in conjunction with examples, which are only used to explain the present application and are not used to limit the scope of the present application.

[0013] Example 1 A thin aluminum alloy sculpture mold comprises an outer mold and an inner mold, and the outer mold and the inner mold are the same in composition and comprise the following components: 65 parts of quartz sand, 30 parts of sodium-based bentonite, 20 parts of porous silica microspheres, 20 parts of pig iron powder, 15 parts of water glass, 12 parts of short alumina fibers and 7 parts of rosin resin powder.

[0014] Example 2 A thin aluminum alloy sculpture mold comprises an outer mold and an inner mold, and the outer mold and the inner mold are the same in composition and comprise the following components: 50 parts of quartz sand, 40 parts of sodium-based bentonite, 30 parts of porous silica microspheres, 30 parts of pig iron powder, 10 parts of water glass, 20 parts of short alumina fibers and 10 parts of rosin resin powder.

[0015] Example 3 A thin aluminum alloy sculpture mold comprises an outer mold and an inner mold, and the outer mold and the inner mold are the same in composition and comprise the following components: 580 parts of quartz sand, 20 parts of sodium-based bentonite, 10 parts of porous silica microspheres, 10 parts of pig iron powder, 20 parts of water glass, 5 parts of short alumina fibers and 5 parts of rosin resin powder.

[0016] The method for preparing a thin aluminum alloy sculpture by using the mold of examples 1-3 is as follows: I. An outer mold and an inner mold are prepared according to the shape of the thin aluminum alloy sculpture, and each component is weighed by parts, stirred uniformly after adding water, and then respectively loaded into the designed outer mold and inner mold for shaping. After demolding, the obtained mold blank is fired in a 1300-1500℃ furnace to form a mold, annealed after cooling to room temperature at a rate of 3-5℃ / min, heated to 900℃, and then cooled to room temperature at a rate of 3-5℃ / min after maintaining for 30-60min. Then the mold blank is soaked in dilute hydrochloric acid with a flow rate of 1-3m / min and a mass fraction of 10%-15% for 10-30min, washed with water and dried, and then the air permeability uniformity is detected to obtain the outer mold and the inner mold. II. The inner cavity surface of the outer mold and the outer surface of the inner mold obtained in step I are coated with silicon oil and then spliced to combine a casting cavity. Molten aluminum alloy is slowly poured into the casting cavity from the bottom of the pouring hole, and an air suction pipe is inserted into the exhaust cavity of the inner mold to exhaust the smoke. III. After the pouring of the molten aluminum alloy is completed, the sculpture blank is obtained after natural cooling and demolding. The surface of the sculpture blank is polished to obtain the thin aluminum alloy sculpture. IV. The outer mold and the inner mold after demolding in step III are soaked in dilute hydrochloric acid as in step I, washed with water and dried, and then the air permeability uniformity is detected for repeated production.

[0017] As Figs. 1-3As shown, the inner edge of the bottom of the outer mold 1 is a concave ring table 2, the lower edge of the inner mold 3 is provided with a flange 4 which completely matches the ring table 2, the outer mold 1 and the inner mold 3 form a casting cavity 5 after combination, the flange 4 is provided with a plurality of casting holes 6, the casting holes 6 which are not used during casting can play a passive exhaust function, the inner mold 3 is hollow, the cavity is an exhaust cavity 7, during casting, the suction pipe is inserted into the exhaust cavity 7, the suction intensity is controlled, and the aluminum liquid can be more fully filled in the casting cavity 5.

[0018] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for casting a thin aluminum alloy sculpture, characterized in that, Includes the following steps: 1) Preparation of outer and inner molds Weigh the following components according to the following weight parts: 50-80 parts of quartz sand, 20-40 parts of sodium bentonite, 10-30 parts of porous silica microspheres, 10-30 parts of pig iron powder, 10-20 parts of water glass, 5-20 parts of alumina short fibers, and 5-10 parts of rosin resin powder. Add water and stir evenly. Then, put them into the designed outer mold and inner mold respectively for shaping. After demolding, the mold blanks are fired in an incinerator to form the mold. After cooling to room temperature, they are annealed. Then, the mold blanks are soaked in flowing dilute hydrochloric acid, washed with water and dried. After testing the air permeability uniformity, the outer mold and inner mold are obtained. 2) Casting After applying silicone oil to the inner cavity surface of the outer mold and the outer surface of the inner mold obtained in step 1), they are spliced ​​together to form a casting cavity. Molten aluminum alloy liquid is slowly poured into the casting cavity from the bottom casting hole. At the same time, the suction pipe is inserted into the inner mold to extract the flue gas. 3) Demolding and molding After the aluminum alloy molten liquid is poured in, it is naturally cooled and then demolded to obtain a sculpture blank. After polishing the surface of the sculpture blank, the thin aluminum alloy sculpture is obtained. 4) Reuse After demolding in step 3), the outer mold and inner mold are soaked in dilute hydrochloric acid as in step 1), washed with water, dried, and tested for air permeability uniformity, and then used to prepare the thin aluminum alloy sculpture again.

2. The method according to claim 1, characterized in that, In step 1), the temperature of the incinerator is 1300~1500℃; the annealing process is as follows: at room temperature, the temperature is increased to 900℃ at a rate of 3~5℃ / min, held for 30~60min, and then reduced to room temperature at a rate of 3~5℃ / min.

3. The method according to claim 1, characterized in that, In step 1), the mass fraction of dilute hydrochloric acid is 10%~15%, the flow rate is 1~3m / min, and the soaking time is 10~30min.

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