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Production method of low-cost meltable metal mold core for titanium alloy precise-investment casting

A technology of investment precision casting and production method, which is applied to casting molding equipment, casting molds, cores, etc., can solve the problems of poor retreat and strength of metal cores, and achieve the effects of complete forming, easy operation and low cost.

Inactive Publication Date: 2010-06-23
SHENYANG RES INST OF FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process can effectively solve the problems of poor yield and poor strength of metal cores used in titanium alloy investment precision casting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Hollow straight tube structure:

[0012] The core material is pure aluminum, take K M = 1, K = 2.4, G 件 =3kg, G 芯 =1.2kg, the wall thickness of the core is L=1·2.4·3 / 1.2=6mm.

[0013] Rare earth oxide and stabilizer ZrO 2 Mix evenly with CaO, calcined in a high-temperature kiln, the calcining temperature is controlled at 1780 ° C, the calcining time is 20 hours, crushed into particles, and passed through a 40-mesh sieve to obtain mixed rare earth oxides, the composition of which is: 80% Y 2 o 3 +ReO, 10% ZrO 2 and 10% CaO. The rare earth oxide and zirconium acetate are mixed in a ratio of 3:1 by volume. Put the prepared mixed rare earth oxide material into the zirconium acetate solution, mix evenly, and stir for 1 hour to form a usable coating.

[0014] The mixed rare earth oxide paint layer is sprayed on the surface of the core with vacuum plasma spraying equipment, and dried at room temperature. Finally, the cores are assembled and positioned according to the...

Embodiment 2

[0016] Hollow right-angle L-shaped structure:

[0017] The core material is pure magnesium, take K M = 1.2, K = 2.5, G 件 =3.0kg,G 芯 =1.0kg, the wall thickness of the core is L=1.2·2.5·3 / 1.0=9mm.

[0018] Rare earth oxide and stabilizer ZrO 2 Mix evenly with CaO, calcined in a high-temperature kiln, the calcining temperature is controlled at 1820 ° C, the calcining time is 18 hours, crushed into particles, and passed through a 50-mesh sieve to obtain mixed rare earth oxides, the composition of which is: 80% Y 2 o 3 +ReO, 15% ZrO 2 and 5% CaO. The rare earth oxide and zirconium acetate are mixed in a ratio of 3.5:1 by volume. Put the prepared mixed rare earth oxide material into the zirconium acetate solution, mix evenly, and stir for 2 hours to form a usable coating.

[0019] The mixed rare earth oxide paint layer is sprayed on the surface of the core with vacuum plasma spraying equipment, and dried at room temperature. Finally, the cores are assembled and positioned a...

Embodiment 3

[0021] Hollow T-shaped structure:

[0022] The core material is pure zinc, take K M = 4, K = 2.4, G 件 =3.0kg,G 芯 =3.5kg, the wall thickness of the core is L=4·2.4·3.0 / 3.5=8.2mm.

[0023] Rare earth oxide and stabilizer ZrO 2 Mix evenly with CaO, calcined in a high-temperature kiln, the calcining temperature is controlled at 1900 ° C, the calcining time is 19 hours, crushed into particles, and passed through a 60-mesh sieve to obtain mixed rare earth oxides, the composition of which is: 75% Y 2 o 3 +ReO, 20% ZrO 2 and 5% CaO. The rare earth oxide and zirconium acetate are mixed in a ratio of 4:1 by volume. Put the prepared mixed rare earth oxide material into the zirconium acetate solution, mix evenly, and stir for 4 hours to form a usable coating.

[0024] The mixed rare earth oxide paint layer is sprayed on the surface of the core with vacuum plasma spraying equipment, and dried at room temperature. Finally, the cores are assembled and positioned according to the mol...

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Abstract

The invention relates to a production method of a low-cost meltable metal mold core for titanium alloy precise-investment casting. In the method, low-melting-point metal, such as aluminum, magnesium or zinc and aluminum alloy, magnesium alloy or zinc alloy, is used to prepare a mold core of a casting mold for titanium alloy casting, and the mold core has a tubular structure with a set thickness; the formula determining the thickness of the mold core is L is equal to the quotient of the product of KM, K and G (cast product) divided by G (core), wherein KM represents the coefficient of a metal type of the mold core, G (cast product) represents the weight of a cast product; K represents a proportionality coefficient within the range from 2.4 to 4.5, G (core) represents the weight of a core; after the mold core is prepared, a mixed dilute oxide coating is sprayed on the surface of the mold core, and the mold core is carried out the mold formation, is positioned according to the structure of a cast mold, thus can be used for casting. The invention can be operated simply. Moreover, since the mold core is softened or liquefied after the cast product is solidified, the yield is high. The structure of the mold cavity of the cast product can be completely formed, the surface thereof is smooth, and the forming efficiency thereof is high. In addition, the mold core can be treated simply with an ordinary electric furnace after being cleaned, so as to be repeatedly used for mold core preparation, thereby reducing the cost.

Description

technical field [0001] The invention relates to a production method of a mold part for titanium alloy precision casting, in particular to a production method of a metal core for titanium alloy molten film precision casting. Background technique [0002] At present, titanium alloy casting processes mainly include graphite casting process, investment casting process and metal casting process. When the casting structure requires the use of cores, the investment precision casting process generally uses metal oxide sintered cores. For small cavity structures, metal oxide sintered cores are easily damaged, resulting in casting structures that cannot meet user requirements. The core is made of refractory metal, but its application is limited due to non-concession, difficulty in cleaning, and high cost. Contents of the invention [0003] The object of the present invention is to provide a method for producing a low-cost fusible metal core for titanium alloy investment precision c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/10
Inventor 谢华生赵军张春辉马志毅于志强刘宏宇
Owner SHENYANG RES INST OF FOUNDRY
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