Sand mould casting process for titanium and titanium alloy castings

Abstract

The invention relates to a sand mould casting process for titanium and titanium alloy castings. The sand mould casting process adopts graphite powders or graphite chippings produced while a graphite casting mould is processed by a production machine as a fire-resistant material, adopts the sand mould casting process to manufacture the casting moulds, and adopts the vacuum self-consuming kish furnace to melt and cast. The sand mould casting process mainly comprises the following processing steps of: 1) manufacturing a casting mould; 2) preparing the manufacturing material; 3) molding; 4) drying and solidifying; 5) performing vacuum degassing and roasting; and 6) melting and casting. The sand mould casting process has the following advantages: with the adoption of the graphite powders or the graphite chippings produced while the graphite casting mould is processed by the production machine, the production cost is reduced and the molding process is simple, so that the utilization rate of the casting material is high; and the sand is convenient to clean.

Description

technical field

[0001] The invention relates to a casting process, in particular to a sand casting process for processing titanium and titanium alloy castings. Background technique

[0002] Titanium and titanium alloys are favored in various fields such as aerospace, petrochemical, medical and sports for their high specific strength and excellent corrosion resistance. Titanium has a high storage capacity in the earth's crust, second only to elements such as Al and Mg, but titanium is not commonly used in daily use at present. Titanium is a very active metal element, especially at high temperature, it is easy to chemically react with other elements. The molten titanium metal can react with almost all refractory materials to varying degrees. This makes the casting of titanium and titanium alloys necessary to select casting materials with high chemical stability, which are melted under vacuum or inert gas protection conditions, and the casting production cost is very high. ...

Examples

Embodiment 1

[0030] A kind of sand casting process for processing titanium and titanium alloy castings, comprising the following steps:

[0031] 1) Casting mold making

[0032] Make the casting mold according to the casting process drawing, and the mold material is wood or steel or aluminum.

[0033] 2) Configure preparation materials

[0034] Selection of raw materials: use graphite powder of 50-100 meshes and graphite sand with particle size diameter less than 2mm, phenolic resin, ethanol, oxalic acid;

[0035] Screen the graphite powder and debris left over from the machining graphite-type process, and screen out graphite sand with a particle size of 50-100 mesh and a particle size diameter of less than 2mm;

[0036] Prepare binder: mix phenolic resin and oxalic acid in a mass ratio of 10:1, first dissolve oxalic acid in ethanol and add it evenly into the phenolic resin, and stir for 10-20 minutes to form a binder, adding ethanol during the stirring process Dilute and adjust the visc...

Embodiment 2

[0049] A kind of sand casting process for processing titanium and titanium alloy castings, comprising the following steps:

[0050] 1) Casting mold making

[0051] Make the casting mold according to the casting process drawing, and the mold material is wood or steel or aluminum.

[0052] 2) Configure preparation materials

[0053] Selection of raw materials: 50 mesh graphite powder and graphite sand with particle size diameter less than 2mm, phenolic resin, ethanol, oxalic acid;

[0054] Screen the graphite powder and debris left over from the mechanical processing graphite type process, and screen out graphite sand with a particle size of 50 mesh and a particle size diameter of less than 2mm;

[0055] Configure binder: mix phenolic resin and oxalic acid in a mass ratio of 10:1, first dissolve oxalic acid in ethanol and evenly add it to the phenolic resin, and stir for 10 minutes to configure a binder, add ethanol to dilute during the stirring process, Regulating the viscos...

Embodiment 3

[0068] A kind of sand casting process for processing titanium and titanium alloy castings, comprising the following steps:

[0069] 1) Casting mold making

[0070] Make the casting mold according to the casting process drawing, and the mold material is wood or steel or aluminum.

[0071] 2) Configure preparation materials

[0072] Selection of raw materials: 80-mesh graphite powder and graphite sand with particle size diameter less than 2mm, phenolic resin, ethanol, oxalic acid;

[0073] Screen the graphite powder and debris left over from the mechanical processing graphite type process, and screen out graphite sand with a particle size of 80 mesh and a particle size diameter of less than 2mm;

[0074] Configure binder: mix phenolic resin and oxalic acid in a mass ratio of 10:1, first dissolve oxalic acid in ethanol and evenly add it to the phenolic resin, and stir for 15 minutes to configure a binder, add ethanol to dilute during the stirring process, Regulate the viscosit...

technical field

[0001] The invention relates to a casting process, in particular to a sand casting process for processing titanium and titanium alloy castings. Background technique

[0002] Titanium and titanium alloys are favored in various fields such as aerospace, petrochemical, medical and sports for their high specific strength and excellent corrosion resistance. Titanium has a high storage capacity in the earth's crust, second only to elements such as Al and Mg, but titanium is not commonly used in daily use at present. Titanium is a very active metal element, especially at high temperature, it is easy to chemically react with other elements. The molten titanium metal can react with almost all refractory materials to varying degrees. This makes the casting of titanium and titanium alloys necessary to select casting materials with high chemical stability, which are melted under vacuum or inert gas protection conditions, and the casting production cost is very high. ...

Examples

Embodiment 1

[0030] A kind of sand casting process for processing titanium and titanium alloy castings, comprising the following steps:

[0031] 1) Casting mold making

[0032] Make the casting mold according to the casting process drawing, and the mold material is wood or steel or aluminum.

[0033] 2) Configure preparation materials

[0034] Selection of raw materials: use graphite powder of 50-100 meshes and graphite sand with particle size diameter less than 2mm, phenolic resin, ethanol, oxalic acid;

[0035] Screen the graphite powder and debris left over from the machining graphite-type process, and screen out graphite sand with a particle size of 50-100 mesh and a particle size diameter of less than 2mm;

[0036] Prepare binder: mix phenolic resin and oxalic acid in a mass ratio of 10:1, first dissolve oxalic acid in ethanol and add it evenly into the phenolic resin, and stir for 10-20 minutes to form a binder, adding ethanol during the stirring process Dilute and adjust the visc...

Embodiment 2

[0049] A kind of sand casting process for processing titanium and titanium alloy castings, comprising the following steps:

[0050] 1) Casting mold making

[0051] Make the casting mold according to the casting process drawing, and the mold material is wood or steel or aluminum.

[0052] 2) Configure preparation materials

[0053] Selection of raw materials: 50 mesh graphite powder and graphite sand with particle size diameter less than 2mm, phenolic resin, ethanol, oxalic acid;

[0054] Screen the graphite powder and debris left over from the mechanical processing graphite type process, and screen out graphite sand with a particle size of 50 mesh and a particle size diameter of less than 2mm;

[0055] Configure binder: mix phenolic resin and oxalic acid in a mass ratio of 10:1, first dissolve oxalic acid in ethanol and evenly add it to the phenolic resin, and stir for 10 minutes to configure a binder, add ethanol to dilute during the stirring process, Regulating the viscos...

Embodiment 3

[0068] A kind of sand casting process for processing titanium and titanium alloy castings, comprising the following steps:

[0069] 1) Casting mold making

[0070] Make the casting mold according to the casting process drawing, and the mold material is wood or steel or aluminum.

[0071] 2) Configure preparation materials

[0072] Selection of raw materials: 80-mesh graphite powder and graphite sand with particle size diameter less than 2mm, phenolic resin, ethanol, oxalic acid;

[0073] Screen the graphite powder and debris left over from the mechanical processing graphite type process, and screen out graphite sand with a particle size of 80 mesh and a particle size diameter of less than 2mm;

[0074] Configure binder: mix phenolic resin and oxalic acid in a mass ratio of 10:1, first dissolve oxalic acid in ethanol and evenly add it to the phenolic resin, and stir for 15 minutes to configure a binder, add ethanol to dilute during the stirring process, Regulate the viscosit...