A graphite mold casting method for large thin-walled titanium alloy castings

A titanium alloy and graphite type technology, which is applied to casting molding equipment, casting molds, cores, etc., can solve the problems of insufficient pouring of thin-walled parts, achieve the effects of improving surface quality, reducing cracks and other defects, and simplifying the operation of the process flow

Active Publication Date: 2018-02-06
LUOYANG SUNRUI TI PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when using machined graphite casting to produce thin-walled castings, insufficient pouring often occurs in thin-walled parts

Method used

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  • A graphite mold casting method for large thin-walled titanium alloy castings

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Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: A graphite type casting method of a large thin-walled titanium alloy casting, the method comprises the following steps: preparation of a graphite mold, assembly and casting of a graphite mold, wherein the graphite mold is assembled from the prepared graphite mold The graphite mold used for casting the air inlet casting is composed of 42 graphite moulds. Before the graphite mold is used to assemble the graphite mold, 33 of the graphite molds need to be coated. The coating treatment includes the following steps:

[0025] (1) Mix yttrium oxide and zirconia into a mixed powder according to a weight ratio of 95:5, then mix the mixed powder and silica sol according to a weight ratio of 4.5:1 to prepare a paint paste, and then add 1 drop to the paint paste defoamer, and stir until the paint paste appears fluidity, pour the diluent into it and stir until the viscosity of the paint reaches 15 g / min, to obtain the paint for brushing;

[0026] (2) Mix the mixed powde...

Embodiment 2

[0033] Embodiment 2: a graphite type casting method of a large thin-walled titanium alloy casting, the method comprises the following steps: preparation of a graphite mold, assembly and casting of a graphite mold, wherein the graphite mold is assembled from the prepared graphite mold The graphite mold used for casting the air inlet casting is composed of 42 graphite moulds. Before the graphite mold is used to assemble the graphite mold, 33 of the graphite molds need to be coated. The coating treatment includes the following steps:

[0034] (1) Mix yttrium oxide and zirconia into a mixed powder according to a weight ratio of 90:10, then mix the mixed powder and silica sol according to a weight ratio of 3:1 to prepare a paint paste, and then add 2 drops to the paint paste defoaming agent, and stir until the paint paste appears fluidity, pour the diluent into it and stir until the paint viscosity reaches 25 g / min, to obtain the paint for brushing;

[0035] (2) Mix the mixed powde...

Embodiment 3

[0042]Embodiment 3: a graphite type casting method of a large thin-walled titanium alloy casting, the method comprises the following steps: preparation of a graphite mold, assembly and casting of a graphite mold, wherein the graphite mold is assembled from the prepared graphite mold The graphite mold used for casting the air inlet casting is composed of 42 graphite moulds. Before the graphite mold is used to assemble the graphite mold, 33 of the graphite molds need to be coated. The coating treatment includes the following steps:

[0043] (1) Mix yttrium oxide and zirconia into a mixed powder according to a weight ratio of 92:8, then mix the mixed powder and silica sol according to a weight ratio of 6:1 to prepare a paint paste, and then add 1 drop to the paint paste defoamer, and stir until the paint paste appears fluidity, pour the diluent into it and stir until the viscosity of the paint reaches 20 g / min, to obtain the paint for brushing;

[0044] (2) Mix the mixed powder a...

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Abstract

A graphite type casting method for large thin-walled titanium alloy castings, the method comprising the following steps: preparing a graphite mold, assembling and casting the graphite mold; coating the prepared graphite mold before assembling the graphite mold , Coating treatment includes deployment of paint, graphite mold surface treatment, graphite mold surface brushing and spraying coating, vacuum degassing and grinding. The invention optimizes the surface structure of the graphite casting mold cavity, and can effectively improve the surface quality of the graphite casting when producing the graphite casting. The surface roughness of the titanium casting can reach a level of 6.3 μm, reaching the level of investment precision titanium alloy castings It can also greatly improve the filling limit of thin-walled castings, ensure the complete filling of thin-walled titanium alloy castings, and improve the yield of large-scale thin-walled titanium castings.

Description

technical field [0001] The invention belongs to the technical field of casting titanium alloy castings, and in particular relates to a graphite type casting method for large thin-walled titanium alloy castings. Background technique [0002] There are currently two relatively mature production methods for titanium alloy castings, one is investment casting and the other is machining graphite casting. [0003] Applying investment casting to the production of thin-walled titanium alloy castings, the obtained castings have good appearance quality, but in the production process of large thin-walled titanium castings using investment casting, the deformation in the wax mold stage is not easy to control, and the wax mold The deformation of the final casting will cause the size of the final casting to be out of tolerance, and in severe cases, the casting will be scrapped, and the yield of the casting will be low. If machining graphite type casting is used to produce large thin-walle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00B22C9/06B22C9/24
CPCB22C3/00B22C9/06B22C9/24
Inventor 孙宏喆包淑娟李伟东贾国成姬战利杨红霞
Owner LUOYANG SUNRUI TI PRECISION CASTING
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