CN111421108A - Preparation method of mold shell of thin-wall titanium alloy casting with complex structure - Google Patents
Preparation method of mold shell of thin-wall titanium alloy casting with complex structure Download PDFInfo
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- CN111421108A CN111421108A CN202010412138.8A CN202010412138A CN111421108A CN 111421108 A CN111421108 A CN 111421108A CN 202010412138 A CN202010412138 A CN 202010412138A CN 111421108 A CN111421108 A CN 111421108A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
- B22C1/186—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents contaming ammonium or metal silicates, silica sols
- B22C1/188—Alkali metal silicates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/043—Removing the consumable pattern
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D47/00—Casting plants
- B22D47/02—Casting plants for both moulding and casting
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention belongs to the technical field of casting, and particularly relates to a method for preparing a mold shell of a thin-wall complex-structure titanium alloy casting, which is suitable for investment precision casting of the thin-wall complex-structure titanium alloy casting, wherein slurry binders of a surface layer and a transition layer of the thin-wall complex titanium alloy casting are used, the mold shell of the casting is excellent in quality, the casting has no slag inclusion defect, when the thickness of the casting is less than 20mm, an α oxide layer is thin and can be removed in a dry sand blowing mode, and when the surface quality of a wax mold is less than 3.2, the surface quality of the casting is Ra3.2-6.3, and the surface quality is excellent.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a method for preparing a mold shell of a titanium alloy casting with a thin-wall complex structure, which is suitable for investment precision casting of the titanium alloy casting with the thin-wall complex structure.
Background
The titanium alloy has the characteristics of high specific strength, good corrosion resistance, good high and low temperature performance and the like, and is widely applied to the fields of aerospace, chemical engineering, naval vessels and the like in China. Since the 20 th century and the 50 th century, titanium alloy has been rapidly developed particularly in the field of aerospace, and the titanium alloy as one of the main structural materials of modern airplanes and engines not only can reduce the weight of the airplane, but also has important substantive significance for optimizing the structure of the airplane. However, the application of titanium alloy in China is mainly focused on the field of forgings, the titanium alloy forgings generally need to be machined to achieve final near-net-shape forming, the production cost is high, particularly, with the rapid development of various industrial fields, the part design tends to develop towards the direction of thin wall and complex and integrated structure, and the continuous use of the titanium alloy forgings not only is difficult to meet the production requirements, but also can cause the increase of the production cost and the waste of raw materials. Therefore, reducing the production cost of titanium alloy and improving the yield of raw materials are significant problems related to the development prospect of titanium alloy.
Investment casting, also known as lost wax casting, is an advanced process close to net shape, and castings produced by the process have the characteristics of precision, complexity and close to the final shape of parts and can be directly used without machining or with little machining. Therefore, the investment casting technology is considered as an effective measure for reducing the production cost of the titanium alloy, is considered as a substitute for forging and machining technologies, has low requirements on structural design of parts, is flexible to manufacture, and is suitable for manufacturing components with complex shapes, and the development of the titanium industry is certainly promoted by the improvement of the investment casting technology of the titanium alloy at the present stage.
The investment casting production process of the titanium alloy casting is basically formed, most of slurry for a mould shell of the casting is prepared from yttrium oxide and zirconium acetate, but the mould shell is easy to generate slag falling, and the metallurgical quality and the surface quality of the casting are influenced finally. The development and application of titanium alloy castings are seriously affected by the occurrence of the problems, so that appropriate solutions for the problems need to be designed at present.
Disclosure of Invention
In order to improve the production process of the titanium alloy thin-wall complex-structure casting, accelerate the feasibility of replacing a forging by the titanium alloy casting and reduce the production and use cost of the titanium alloy, the method for preparing the mold shell of the titanium alloy casting with the thin-wall complex structure is provided.
The technical scheme of the invention is as follows:
a method for preparing a mould shell of a thin-wall complex-structure titanium alloy casting comprises the following steps:
step 1: pressing a casting wax mold, wherein the surface roughness of the wax mold is higher than Ra3.2;
step 2: finishing the wax module type according to the design of a pouring system;
and step 3: a casting mould shell is prepared,
3.1) the facing and second layer slurries included the following ingredients:
(a) mixing distilled water, silica sol and 325-mesh yttrium oxide-zirconium oxide powder to obtain a binder raw material matrix, wherein the viscosity requirement is 0.45-0.55 Pa.s, and the mass ratio of the silica sol to the 325-mesh yttrium oxide-zirconium oxide powder is 92: 8;
(b) 2-4% of latex by mass percentage,
(c) 4-6% of TiO by mass2，
(d) Dioctyl sodium sulfur succinate (1% solution) with the mass percent of 0.2-0.4%;
3.2) the viscosity of the slurry is 8-14 s (Chinese standard measuring cup);
3.3) the surface layer and the second layer are sanded by yttrium oxide with 100 meshes;
the reinforcing layer and the sealing layer are prepared in a silica sol mould shell mode;
and 4, step 4: dewaxing the mould shell;
and 5: prepared with a diameter of
Finishing electrode welding by using the ingot;
step 6: fixing the mould shell to a centrifugal disc of the skull furnace, and enabling the mould shell to enter the furnace at the temperature: 400-600 ℃;
and 7: smelting and pouring a casting;
and 8: cleaning the shell, sawing and polishing the casting;
step 9, measuring α oxide layers with different casting thicknesses, wherein when the casting thickness is less than 20mm, α oxide layers can be eliminated after the surface of the casting is subjected to dry sand blowing;
step 10: detecting the metallurgical quality of the casting by rays and fluorescence;
step 11: and detecting the surface quality of the casting.
The invention has the advantages that:
the invention provides a method for preparing a formwork of a titanium alloy casting with a thin-wall complex structure, which uses a slurry binder for a surface layer and a transition layer of the thin-wall complex titanium alloy casting, and has the advantages of excellent quality of the casting formwork, no slag inclusion defect of the casting, thin α oxide layer which can be removed in a dry sand blowing mode when the thickness of the casting is less than 20mm, and excellent surface quality when the surface quality of a wax mould is less than 3.2 and the surface quality of the casting is Ra3.2-6.3.
Detailed Description
The invention is further illustrated by the following examples, which are not to be construed as limiting the invention thereto. The following provides specific materials and sources thereof used in embodiments of the present invention. However, it should be understood that these are exemplary only and not intended to limit the invention, and that materials of the same or similar type, quality, nature or function as the following reagents and instruments may be used in the practice of the invention. The experimental procedures used in the following examples are all conventional procedures unless otherwise specified. Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The method is based on a thin-wall complex-structure shell casting product for an airplane, takes shell manufacturing of a shell as an object, firstly adopts yttrium oxide and a special binder to prepare surface layer slurry, determines the optimal shell manufacturing process parameters, finishes pouring, cleans and polishes shells of the casting, detects the thickness of α oxide layers on the surfaces of different parts of the casting, nondestructively detects the metallurgical quality of the casting, and evaluates the surface quality of the casting.
A method for preparing a mold shell of a thin-wall titanium alloy casting with a complex structure comprises the following specific steps:
step 1: pressing a casting wax mold, wherein the surface roughness of the wax mold is higher than Ra3.2;
step 2: finishing the wax module type according to the design of a pouring system;
and step 3: a casting mould shell is prepared,
3.1) the components of the surface layer and the second layer of slurry are as follows:
(a) mixing distilled water, silica sol and 325-mesh yttrium oxide-zirconium oxide powder to obtain a binder raw material matrix, wherein the viscosity requirement is 0.45-0.55 Pa.s, the mass ratio of the silica sol to the 325-mesh yttrium oxide-zirconium oxide powder is 92:8,
(b) 2-4% of latex (accounting for the total mass of the slurry),
(c) 4-6% of TiO by mass2(accounting for the total mass of the slurry),
(d) 0.2-0.4% of 1% dioctyl sodium sulfur succinate solution (accounting for the total mass of the slurry);
3.2) the viscosity of the slurry is 8-14 s (Chinese standard measuring cup);
3.3) the surface layer and the second layer are sanded by yttrium oxide with 100 meshes;
the reinforcing layer and the sealing layer are prepared in a silica sol mould shell mode;
and 4, step 4: dewaxing the mould shell;
and 5: prepared with a diameter of
The height of the ingot is determined according to the material used for the casting, and the electrode welding is completed;
step 6: fixing the mould shell to a centrifugal disc of the skull furnace, and enabling the mould shell to enter the furnace at the temperature: 400-600 ℃;
and 7: smelting and pouring a casting;
and 8: cleaning the shell, sawing and polishing the casting;
step 9, measuring α oxide layers with different casting thicknesses, wherein when the casting thickness is less than 20mm, α oxide layers can be eliminated after the surface of the casting is subjected to dry sand blowing;
step 10: detecting the metallurgical quality of the casting by rays and fluorescence;
step 11: and detecting the surface quality of the casting.
Example 1:
taking a bracket casting as an example, the size of the casting is 450 × 300 × 100mm, the material is ZTA15, the wall thickness difference is large, the sizes of the thin wall and the thick wall are respectively 7mm and 26mm, the ratio is close to 1:4, and the method comprises the following specific steps:
step 1: pressing a casting wax mold, wherein the surface roughness of the wax mold is higher than Ra3.2;
step 2: finishing the wax module type according to the design of a pouring system;
step 3, preparing a casting mold shell, wherein ①, the surface layer and the second layer of slurry comprise the components of (a) distilled water, silica sol and 325-mesh yttrium oxide-zirconium oxide powder (the mass ratio is 92:8) which are proportioned to form a binder raw material matrix, the viscosity of the binder raw material matrix is 0.45 Pa.s, (b) 4% of latex, (c) 6% of TiO2(d) 0.4% dioctyl sodium sulfur succinate (1% solution), ②, the slurry viscosity is 14s (Chinese standard measuring cup), ③, the surface layer and the second layer of sanding are 100 meshes of yttrium oxide, and the reinforcing layer and the sealing layer are prepared by adopting a conventional silica sol formwork way;
and 4, step 4: dewaxing the mould shell;
and 5: prepared with a diameter of
The height of the material ingot is 420mm, and electrode welding is completed;
step 6: fixing the mould shell to a centrifugal disc of the skull furnace, and enabling the mould shell to enter the furnace at the temperature: 400 ℃;
and 7: smelting and pouring a casting;
and 8: cleaning the shell, sawing and polishing the casting;
step 9, measuring the thickness of α oxide layers at different positions of the casting;
step 10: detecting the metallurgical quality of the casting by rays and fluorescence;
step 11: and detecting the surface quality of the casting.
According to the method, the thickness of the α oxide layer at the wall thickness of 7mm and 26mm of the casting is 0.019mm and 0.096mm respectively, the metallurgical quality of the casting meets the requirement of GJB2896A II type parts through X-ray and fluorescence detection, and the surface quality of the casting is Ra3.2-6.3.
Example 2:
taking the casting of the diversion basin as an example, the casting material ZTC4 has the contour dimension
The whole wall thickness is 6mm, and the foundry goods is the basin form, and the radian is great, and the inner chamber is hollow. The method comprises the following specific steps:
step 1: pressing a casting wax mold, wherein the surface roughness of the wax mold is higher than Ra3.2;
step 2: finishing the wax module type according to the design of a pouring system;
step 3, preparing a casting mold shell, wherein ①, the surface layer and the second layer of slurry comprise the components of (a) distilled water, silica sol and 325-mesh yttrium oxide-zirconium oxide powder (the mass ratio is 92:8) which are proportioned to form a binder raw material matrix, the viscosity of the binder raw material matrix is 0.50 Pa.s, (b) 4% of latex, (c) 6% of TiO2(d) 0.4% dioctyl sodium sulfur succinate (1% solution), ②, the slurry viscosity is 14s (Chinese standard measuring cup), ③, the surface layer and the second layer of sanding are 100 meshes of yttrium oxide, and the reinforcing layer and the sealing layer are prepared by adopting a conventional silica sol formwork way;
and 4, step 4: dewaxing the mould shell;
and 5: prepared with a diameter of
The height of the material ingot is 380mm, and electrode welding is completed;
step 6: fixing the mould shell to a centrifugal disc of the skull furnace, and enabling the mould shell to enter the furnace at the temperature: 400 ℃;
and 7: smelting and pouring a casting;
and 8: cleaning the shell, sawing and polishing the casting;
step 9, measuring the thickness of α oxide layers at different positions of the casting;
step 10: detecting the metallurgical quality of the casting by rays and fluorescence;
step 11: and detecting the surface quality of the casting.
According to the method, the thickness of α oxide layers at the 6mm, 15mm and 22mm wall thickness of the casting is 0.017mm, 0.056mm and 0.096mm respectively, the metallurgical quality of the casting meets the requirement of GJB2896A II parts through X-ray and fluorescence detection, and the surface quality of the casting is between Ra3.2-6.3.
The above description of exemplary embodiments has been presented only to illustrate the technical solution of the invention and is not intended to be exhaustive or to limit the invention to the precise form described. Obviously, many modifications and variations are possible in light of the above teaching to those skilled in the art. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to thereby enable others skilled in the art to understand, implement and utilize the invention in various exemplary embodiments and with various alternatives and modifications. It is intended that the scope of the invention be defined by the following claims and their equivalents.
Claims (1)
1. A preparation method of a mold shell of a thin-wall complex-structure titanium alloy casting is characterized by comprising the following steps:
step 1: pressing a casting wax mold, wherein the surface roughness of the wax mold is higher than Ra3.2;
step 2: finishing the wax module type according to the design of a pouring system;
and step 3: a casting mould shell is prepared,
3.1) the facing and second layer slurries included the following ingredients:
(a) mixing distilled water, silica sol and 325-mesh yttrium oxide-zirconium oxide powder to obtain a binder raw material matrix, wherein the viscosity requirement is 0.45-0.55 Pa.s, and the mass ratio of the silica sol to the 325-mesh yttrium oxide-zirconium oxide powder is 92: 8;
(b) 2-4% of latex by mass percentage,
(c) 4-6% of TiO by mass2，
(d) 0.2-0.4% of 1% dioctyl sodium sulfur succinate solution by mass percent;
3.2) the viscosity of the slurry is 8-14 s;
3.3) the surface layer and the second layer are sanded by yttrium oxide with 100 meshes;
the reinforcing layer and the sealing layer are prepared in a silica sol mould shell mode;
and 4, step 4: dewaxing the mould shell;
and 5: prepared with a diameter of
Finishing electrode welding by using the ingot;
step 6: fixing the mould shell to a centrifugal disc of the skull furnace, and enabling the mould shell to enter the furnace at the temperature: 400-600 ℃;
and 7: smelting and pouring a casting;
and 8: cleaning the shell, sawing and polishing the casting;
step 9, measuring α oxide layers with different casting thicknesses, and eliminating α oxide layers after dry sand blowing is carried out on the surface of the casting when the casting thickness is less than 20 mm;
step 10: detecting the metallurgical quality of the casting by rays and fluorescence;
step 11: and detecting the surface quality of the casting.
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