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Precision casting method for graphite mould-ceramic core titanium alloy

A technology of precision casting and graphite type, which is applied to cores, casting molding equipment, casting molds, etc., can solve the problems of many processes, environmental pollution, and high cost of making investment molds, so as to reduce casting costs, improve dimensional accuracy, shorten The effect of the production cycle

Active Publication Date: 2010-06-16
SHENYANG RES INST OF FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the molding of complex three-dimensional curved surface and small-diameter titanium-like alloy castings, the machine-added graphite casting process is used to cast, which requires a large amount of graphite to process the core, and due to the characteristics of graphite itself, the graphite core does not have high dimensional accuracy And surface roughness, this not only increases the material cost of castings, but also increases the processing difficulty and processing cost for castings with high surface quality requirements, prolongs the production cycle of castings and reduces production efficiency
Rare earth ceramic type investment precision casting technology can obtain higher casting precision and better surface quality, but it is difficult to ensure the completeness and integrity of the thin-walled casting for titanium alloy castings with complex three-dimensional variable curved surfaces and small diameters. The internal quality is qualified, and the cost of making investment patterns is high, there are many processes, the investment patterns are easy to soften and deform, the dewaxing process is complicated, the wax loss is large, and the working environment is polluted, etc.
Therefore, no matter what kind of casting process, there are problems such as complex pattern making, high production cost, poor working conditions, high labor intensity, long production cycle, low efficiency, and environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The graphite type-ceramic core titanium alloy precision casting method comprises the following process steps:

[0030] 1. Take ZrO 2 88%, CaO 3.5%, Al 2 o 3 0.3%, SiO 2 0.1%, beeswax 5%, oleic acid 0.5%, Y 2 o 3 2.6% is put into the container and mixed evenly to make ceramic core raw materials for subsequent use, and the above-mentioned percentages are mass percentages.

[0031] 2. The ceramic core is molded by hot pressing, the injection pressure is 2.7MPa, the injection temperature is 100°C, and then the mold is preheated to 40°C, and the pressure is kept for 10 seconds to get the ceramic core for use.

[0032] 3. Embed the above-mentioned ceramic cores filled with industrial Al 2 o 3 Put it in a box-type resistance furnace for firing, heat the ceramic core to 600°C, keep it warm for 1 hour, then continue to heat the ceramic core to 1100°C, keep it warm for 6 hours, and finally cool it to room temperature with the furnace. Wash and sandpaper to remove burrs fo...

Embodiment 2

[0040] The graphite type-ceramic core titanium alloy precision casting method of embodiment two is basically the same as embodiment one, and its difference is:

[0041] 1. The ceramic core raw material is made of ZrO 2 89%, CaO 4%, Al 2 o 3 0.3%, SiO 2 0.2%, Beeswax 5.5%, Oleic Acid 0.7% and Y 2 o 3 0.3%;

[0042] 2. In the molding of the ceramic core, the injection pressure is 3MPa, the injection temperature is 140°C, the molding preheating is 45°C, and the holding time is 15s.

[0043] 3. Put the bowl with the ceramic core into the box-type resistance furnace for roasting, first heat the ceramic core to 600°C, keep it warm for 2 hours, then continue to heat to 1200°C, and finally cool to room temperature with the furnace .

[0044] 4. The vacuum degree ≤ 10 -1 After Pa, carry out centrifugal casting, the voltage is 40V, the electric current is 18000A.

Embodiment 3

[0046] The graphite type-ceramic core titanium alloy precision casting method of embodiment three is basically the same as embodiment one, and its difference is:

[0047] 1. The ceramic core raw material is made of ZrO 2 90%, CaO 3.5%, Al 2 o 3 0.3%, SiO 2 0.2%, Beeswax 5%, Oleic Acid 0.5% and Y 2 o 3 0.5%;

[0048] 2. In the molding of the ceramic core, the injection pressure is 3MPa, the injection temperature is 140°C, the molding preheating is 45°C, and the holding time is 15s.

[0049] 3. Put the bowl with the ceramic core into the box-type resistance furnace for roasting, first heat the ceramic core to 600°C, keep it warm for 2 hours, then continue to heat to 1200°C, and finally cool to room temperature with the furnace .

[0050] 4. The vacuum degree ≤ 10 -1 After Pa, carry out centrifugal casting, the voltage is 40V, the electric current is 18000A.

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Abstract

This invention claims a precision casting method for a graphite mould-ceramic core titanium alloy, which comprises the following process steps: 1) preparing a ceramic core; 2) preparing a graphite shell; 3) degassing the graphite shell and the ceramic core; 4) assembling the ceramic core and the graphite shell into a casting mould according to a casting shell drawing; and 5) smelting and casting. The method is characterized in that: the step of degassing the ceramic core comprises the following steps: putting the formed ceramic core into a vacuum degassing furnace, heating the furnace to 200 DEG C, preserving heat for 1 hour, cooling the ceramic core to an indoor temperature with the furnace; the step of degassing the graphite shell comprises the following steps: putting the graphite shell into the vacuum degassing furnace, heating the furnace to 800 DEG C, preserving heat for 3 hours and cooling the graphite shell to the indoor temperature with the furnace; and the ceramic core and the graphite type shell subjected to the degassing process are put into a vacuum self-consumption electrode skull furnace for smelting and casting according to a titanium alloy smelting and casting process. The method has the following advantages that: aiming at a complicated three-dimensional variable camber titanium alloy precision casting, for the titanium alloy casting cast by the method, the size precision, internal quality and surface quality are improved, the rejection rate of the casting is greatly decreased, the casting cost of the casting is reduced and the production period of the casting is shortened.

Description

technical field [0001] The invention relates to a casting method, in particular to a graphite type-ceramic core titanium alloy casting method. Background technique [0002] With the rapid development of aerospace, petrochemical and other industries, there is an increasing demand for some complex three-dimensional variable surface small diameter titanium alloy castings. Such products are mainly formed by casting. At present, titanium alloy casting technology mainly adopts rare earth ceramic investment casting, machine-added graphite casting and other processes. [0003] For the molding of complex three-dimensional curved surface and small-diameter titanium-like alloy castings, the machine-added graphite casting process is used to cast, which requires a large amount of graphite to process the core, and due to the characteristics of graphite itself, the graphite core does not have high dimensional accuracy And surface roughness, this not only increases the material cost of cas...

Claims

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Application Information

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IPC IPC(8): B22D13/00B22D25/02B22C1/10B22C1/12B22C9/10
Inventor 谢华生娄延春赵军张春辉史昆曲玉福汪志华
Owner SHENYANG RES INST OF FOUNDRY
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