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CN-116422833-B - Casting method of thin-wall bronze part

CN116422833BCN 116422833 BCN116422833 BCN 116422833BCN-116422833-B

Abstract

The invention discloses a casting method of a thin-wall bronze part, which comprises the steps of 1) pattern manufacturing, 2) resin sand molding, 3) smelting and pouring, 4) shakeout cleaning and the like. The invention adopts the purple clay sculpture pattern, can manufacture the pattern with complex artistic form and is convenient for the modification of the form. The artistic casting has complex shape and more curved surfaces, and the wall thickness is formed by adopting the calcium plastic skin which is easy to form, so that the wall thickness is ensured to be uniform and the operation is convenient. According to the solidification characteristics of the tin bronze, the invention adopts a top-pouring type open pouring system and a one-die two-cavity pouring system structure, improves the molding efficiency, reduces the consumption of resin sand, reduces the molding cost, does not contain heavy metals such as lead, and is more environment-friendly and healthy. The invention adopts high-temperature boiling refining to obtain high-quality copper liquid.

Inventors

  • WU FANG
  • WU YANG
  • JIANG CHUNMEI

Assignees

  • 南京晨光艺术工程有限公司

Dates

Publication Date
20260512
Application Date
20221213

Claims (7)

  1. 1. A casting method of a thin-wall bronze piece is characterized by comprising the following steps: 1) The method comprises the steps of manufacturing a pattern, namely, carving the pattern with purple clay mud according to a design drawing, and turning the pattern into a gypsum mold for subsequent casting of the pattern, wherein the pattern is in a dry state, and the surface of the pattern is brushed with epoxy polyurethane paint and then is brushed with a release agent, wherein the release agent comprises 5-8% of aluminum powder and 92-95% of rosin water in percentage by mass; 2) Molding resin sand; 3) Smelting and pouring, wherein a smelting material adopts low-tin bronze, and the low-tin bronze comprises 3.5-4.5% of tin, 7-9% of zinc and the balance of copper in percentage by mass; the feeding sequence of the low-tin bronze comprises the steps of flux, electrolytic copper, furnace returning material, 2/3P-Cu, zn, sn, 1/3P-Cu, high-temperature boiling refining, heating to 1320-1350 ℃ and pouring at 1100-1200 ℃; 4) Casting (6) is cooled in a sand mould, and then is subjected to box breaking and shakeout, a pouring cup (1), a straight pouring gate (2), a dead head (3), an inner pouring gate (5), a branch transverse pouring gate (7), a main transverse pouring gate (8), a branch transverse pouring gate (9), a drape and a flash are all removed by adopting a carbon arc gouging, and cut parts are flattened or ground to obtain a thin-wall bronze part; the step 2) of resin sand molding comprises the following steps: 1) Furan resin sand is prepared by adopting furan resin sand molding, wherein raw materials of resin sand are quartz sand, resin and curing agent, and raw materials are added into a mobile sand mixer for stirring to prepare furan resin sand; 2) Manufacturing an inner core, namely manufacturing a core frame by coaming the pattern by using a coaming plate, pouring furan resin sand into the core frame, and performing self-hardening molding at normal temperature to obtain a resin sand inner core; 3) Removing the pattern, pasting the surface of the inner core block according to the thickness of 5-8 mm, wherein the pasting material adopts polyethylene foam board-calcium plastic skin, and pasting the surface from the upper end and the lower end of the surface to the middle cloth row and attaching the surface; 4) Manufacturing an outer core, namely manufacturing an outer frame by using a sand surrounding plate to surround the inner core, pouring furan resin sand into the outer frame, and performing self-hardening molding at normal temperature to obtain the resin sand outer core; 5) Pouring gate arranging, namely brushing parting paint on the top surface after the inner core and the outer core are manufactured and solidified, and performing pouring gate arranging; 6) The coating is painted by opening the inner core and the outer core, removing the wall thickness calcium plastic skin, brushing the coating on the surface of the molded surface, stirring uniformly when the coating is used, adding 1-5% of alcohol for dilution, and burning and drying the coating after the alcohol is ignited to finish the molding of the resin sand, wherein the fire resistance of the coating is more than 1700 ℃.
  2. 2. The casting method of the thin-wall bronze piece according to claim 1, wherein in the step 5), a one-die two-cavity open pouring system is adopted in the runner arrangement process, the pouring system comprises a straight runner (2), a transverse runner and an inner runner (5), the cross section ratio of the straight runner (2), the transverse runner and the inner runner (5) is F Straight line ：F Transverse bar ：F Inner part to be 1:1.2-1.5:1.2-2, and the runner is made of a calcium plastic plate or a PS foam plate.
  3. 3. The method for casting a thin-walled bronze article according to claim 2, wherein the inner runners (5) are uniformly distributed along the upper end of the casting mold, the pitch of the inner runners (5) is equal to or greater than the width thereof, and the thickness of the inner runners (5) is equal to or less than the wall thickness of the casting (6).
  4. 4. The casting method of the thin-wall bronze piece according to claim 2, wherein the cross runners comprise branch cross runners (7), a main cross runner (8) and branch cross runners (9), the length of the branch cross runners (7) can cover all inner runners (5), the sectional area of the branch cross runners (7) is larger than that of the branch cross runners (9), the branch cross runners (9) guide liquid metal to uniformly flow into each branch cross runner (7), the sectional area of the branch cross runners (9) is smaller than that of the main cross runner (8), and the main cross runners (8) are used for distributing the branch cross runners (9).
  5. 5. A casting method of a thin-walled bronze piece according to claim 4, characterized in that a filter screen (4) is provided under the runner.
  6. 6. The casting method of the thin-wall bronze piece according to claim 2, wherein the number of the straight pouring channels (2) is 1-2, the structure of the strain relief head (3) is a flat structure, and the thickness of the lower opening of the strain relief head (3) is smaller than or equal to the wall thickness of the casting (6).
  7. 7. A casting method of a thin-walled bronze according to claim 6, characterized in that the number of strain relief heads (3) is 2 and the strain relief heads (3) are arranged at both ends of the top surface of the casting (6).

Description

Casting method of thin-wall bronze part Technical Field The invention relates to the field of casting, in particular to a casting method of a thin-wall bronze part. Background Bronze sculpture is one of the sculpture arts. A hard material sculpture cast from bronze (an alloy of copper with tin, lead). Bronze sculptures are mostly manufactured by a casting method, wherein the casting method is to heat the sculpturing material to a temperature of hundreds of degrees centigrade to melt the material into a liquid state, then the liquid is poured into a mold, the liquid is in a solid state after being cooled, and finally, a sculpturing producer carries out surface processing on the solid in the mold. Common bronze alloys have unusual and desirable properties in that they expand slightly before solidifying, filling the mold. Then, as the bronze cools, it shrinks a little again, so that the bronze is more easily separated from the mold. Their strength and ductility (no brittleness) are also good, which is a significant advantage over other ceramic materials or marble sculptures in that it is relatively easy to characterize the action pose of a character with bronze. However, the bronze sculpture casting model is generally a hard model such as glass fiber reinforced plastic or metal, and has the problems of high cost, difficult die opening and difficult modification, and meanwhile, the casting with complex shape is difficult to control the wall thickness of the casting or is complex to manufacture. In addition, bronze sculpture often adopts tin bronze as raw material, and tin bronze component has high tin content and high cost, or heavy metals such as lead are added for improving pouring performance. Disclosure of Invention Aiming at the defects and shortcomings of the prior art, the invention provides a casting method of a thin-wall bronze part, which adopts a purple clay sculpture pattern, can manufacture a pattern with complex artistic form and is convenient for form modification. The calcium plastic skin easy to form is adopted to form the wall thickness, so that the wall thickness is ensured to be uniform and the operation is convenient. The open pouring system with top pouring and the pouring system with one die and two cavities are adopted, so that the molding efficiency is improved, the consumption of resin sand is reduced, the molding cost is reduced, and the system is free of heavy metals such as lead and the like and is more environment-friendly and healthy. The technical scheme is that the casting method of the thin-wall bronze piece is characterized by comprising the following steps of: 1) The method comprises the steps of manufacturing a pattern, namely, carving the pattern with purple clay mud according to a design drawing, and turning the pattern into a gypsum mold for subsequent casting of the pattern, wherein the pattern is in a dry state, and the surface of the pattern is brushed with epoxy polyurethane paint and then is brushed with a release agent, wherein the release agent comprises 5-8% of aluminum powder and 92-95% of rosin water in percentage by mass; 2) Molding resin sand; 3) Smelting and pouring, wherein a smelting material adopts low-tin bronze, and the low-tin bronze comprises 3.5-4.5% of tin, 7-9% of zinc and the balance of copper in percentage by mass; The feeding sequence of the low-tin bronze comprises the steps of flux, electrolytic copper, furnace returning material, 2/3P-Cu, zn, sn, 1/3P-Cu, high-temperature boiling refining, heating to 1320-1350 ℃ and pouring at 1100-1200 ℃; 4) And (3) shakeout and cleaning, namely pouring boxes and shakeout are formed after the casting is cooled in the sand mould, pouring cups, straight pouring gates, dead heads, inner pouring gates, branch pouring gates, total pouring gates, branch pouring gates, cape joints and flash edges of the casting are all removed by adopting a carbon arc gouging machine, and cut parts are shoveled or ground flat, so that the thin-wall bronze piece is obtained. Wherein, the step 2) resin sand molding comprises the following steps: 1) Furan resin sand is prepared by adopting furan resin sand molding, wherein raw materials of resin sand are quartz sand, resin and curing agent, and raw materials are added into a mobile sand mixer for stirring to prepare furan resin sand; 2) Manufacturing an inner core, namely manufacturing a core frame by coaming the pattern by using a coaming plate, pouring furan resin sand into the core frame, and performing self-hardening molding at normal temperature to obtain a resin sand inner core; 3) Removing the pattern, pasting the surface of the inner core block according to the thickness of 5-8 mm, wherein the pasting material adopts polyethylene foam board-calcium plastic skin, and pasting the surface from the upper end and the lower end of the surface to the middle cloth row and attaching the surface; 4) Manufacturing an outer core, namely manufacturing an outer frame by using a sand surround