CN110976775B - Titanium-like alloy casting method for large complex rudder framework - Google Patents
Titanium-like alloy casting method for large complex rudder framework Download PDFInfo
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- CN110976775B CN110976775B CN201911135896.3A CN201911135896A CN110976775B CN 110976775 B CN110976775 B CN 110976775B CN 201911135896 A CN201911135896 A CN 201911135896A CN 110976775 B CN110976775 B CN 110976775B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/20—Stack moulds, i.e. arrangement of multiple moulds or flasks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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Abstract
The invention provides a titanium alloy casting method for a large complex rudder framework, which comprises the following steps: designing a bottom pouring type pouring system according to the structural characteristics of the rudder skeleton titanium alloy casting to be formed; penetrating the sprue from the top to the bottom of the bottom-pouring gating system; generating a graphite mold through a software difference solving mode according to the bottom pouring type pouring system; the graphite mold enters a degassing furnace at normal temperature for degassing; the vacuum degree of the degassing furnace is less than 3 Pa; assembling and combining the degassed split graphite molds; and putting the graphite mold after assembly into a titanium alloy skull furnace, extracting a vacuum melting titanium alloy ingot, and pouring to form so as to generate a formed rudder skeleton titanium alloy casting. The invention can meet the production requirements of large complex rudder skeleton titanium alloy castings and improve the internal quality and the qualification rate of the large complex titanium alloy rudder skeleton titanium alloy castings.
Description
Technical Field
The invention relates to the technical field of preparation of titanium alloy graphite type, in particular to a titanium alloy casting method for a large complex rudder framework.
Background
The titanium alloy has excellent performances of high specific strength, high heat resistance, excellent corrosion resistance and the like, is a high-quality light metal structure material, and is widely applied to the fields of aerospace and the like.
The missile has the characteristics of high speed, long range and the like, the technical indexes of a certain type of missile require high accuracy, high Mach, beyond visual range, penetration prevention and the like, and the structural member of the missile body is made of titanium alloy materials. Wherein a rudder skeleton casting has the length of 600mm, the width of 240mm, the maximum wall thickness of 17mm, the minimum wall thickness of 8mm and a variable wall thickness structure inside. The interior of the rudder skeleton is provided with a plurality of lightening grooves with different sizes, and the total number is 12. Generally, the rudder framework has large size, complex internal structure and large wall thickness difference, and casting defects are easily generated in the casting process. The casting is required to be I type casting, 100% X-ray detection is required, and the requirement on internal quality is high.
Through comprehensive analysis on the structure and technical requirements of the rudder skeleton, a casting process scheme of a titanium alloy graphite type and bottom pouring type gating system is adopted, wherein a rudder skeleton casting is placed in an inclined shape. The bottom pouring type pouring system can obviously improve the internal quality of the rudder skeleton casting, but the novel pouring system requires the rudder skeleton to be obliquely placed, so that the production requirement of large complex rudder skeleton titanium alloy castings cannot be met, and the internal quality and the qualification rate of the large complex titanium alloy rudder skeleton casting are lower.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defect that the prior art cannot meet the production requirements of large complex rudder skeleton titanium alloy castings, and the large complex titanium alloy rudder skeleton titanium alloy castings are low in internal quality and qualified rate is overcome, and the large complex rudder skeleton titanium alloy casting method is provided.
The technical solution of the invention is as follows:
in order to solve the technical problem, an embodiment of the present invention provides a method for casting a titanium-like alloy for a large complex rudder frame, including:
designing a bottom pouring type pouring system according to the structural characteristics of the rudder skeleton titanium alloy casting to be formed;
penetrating the sprue from the top to the bottom of the bottom-pouring gating system;
generating a graphite mold through a software difference solving mode according to the bottom pouring type pouring system;
the graphite mold enters a degassing furnace at normal temperature for degassing; the vacuum degree of the degassing furnace is less than 3 Pa;
assembling and combining the degassed split graphite molds;
and putting the graphite mold after assembly into a titanium alloy skull furnace, extracting a vacuum melting titanium alloy ingot, and pouring to form so as to generate a formed rudder skeleton titanium alloy casting.
Preferably, the graphite mold includes: a bottom plate, a ring sleeve, an external mold, a gasket and a cushion block, wherein,
five circular holes are sequentially formed in the main pouring gate from top to bottom, and the bottom of the main pouring gate is assembled and fixed on the bottom plate through a concave-convex structure;
two side surfaces of the main pouring gate are connected with a plurality of outer molds which are stacked and obliquely arranged through the ferrules;
adjacent two of the external molds on each side are assembled and connected through the gasket;
the bottom ends of the external molds on each side are obliquely arranged through the cushion blocks;
the outer die is matched with the main pouring gate through the cushion block.
Preferably, the rudder skeleton titanium alloy casting to be formed is placed obliquely, and forms a certain angle with the main pouring gate through the cushion block.
Preferably, the bottom plate is assembled and fixed on the titanium alloy skull furnace bottom plate, so that the sprue is nested with the sprue cup.
Preferably, the graphite mold is heated to 650-750 ℃ in the degassing furnace for 2-3 hours, is subjected to heat preservation for 1-2 hours, is heated to 850-950 ℃ in 1-2 hours, is subjected to heat preservation for 4-6 hours, and is cooled to below 400 ℃ along with the furnace to be discharged.
Preferably, the assembling and combining the graphite molds of the degassed split bodies includes:
assembling the degassed graphite mold according to a mold assembly drawing;
fixing the bottom plate on the bottom plate of the titanium alloy skull furnace;
assembling the main pouring gate on the bottom plate, wherein the lower part of the main pouring gate is embedded into the concave part inside the convex structure of the bottom plate;
the outer die is arranged on the cushion block in an inclined shape and is connected with the main pouring gate through a ferrule;
and sequentially installing a gasket and the other outer mold on the outer mold, connecting the gasket and the main pouring gate by using a ferrule, and repeating for 5 times to form a mold assembly mode of stacking 5 outer molds.
Preferably, the bottom-pouring gating system comprises: a sprue, a cross gate, an ingate, a drawing die and a riser, wherein,
the sprue penetrates from the top to the bottom, the size of the top of the sprue is larger than that of the bottom, and the top of the sprue is higher than the height of the top of the casting to form a pouring pressure head;
the cross gate is arranged on two sides of the straight gate, the cross section of the cross gate is circular, and an angle is formed between the cross gate and the straight gate and is consistent with the inclination angle of the rudder skeleton titanium alloy casting to be molded;
the ingate is connected with the horizontal pouring gate and the casting and has a cylindrical structure;
the riser is arranged at the top of the casting and is planar in structure, and the size of the bottom of the riser is equal to that of the top of the casting;
the inclination of the drawing die is-5 to-10 degrees.
Preferably, the number of said runners is 8 to 12.
Preferably, the cushion block is of a stepped structure, and the angle of the cushion block is consistent with the inclination angle of the outer die and is 25 degrees;
the heights of the two sides of the cushion block are respectively 160mm and 90mm, and the width of the cushion block is 150 mm;
the length of the gasket is 50mm, the width of the gasket is 50mm, and the thickness of the gasket is 5 mm;
the diameter of the round hole is 50mm, and the diameter of the bottom of the main pouring gate is 150 mm;
the inner diameter of the bottom plate is 150mm, and the outer diameter of the bottom plate is 30mm larger than the inner diameter and is 180 mm;
the diameter of the ferrule is 50 mm;
the outer die is divided into an upper part and a lower part, four holes are sequentially formed in the periphery of the outer die, and the diameter of each hole is 15 mm.
Preferably, the diameter of the top of the straight pouring channel is 100mm, the diameter of the bottom of the straight pouring channel is 90mm, and the middle of the straight pouring channel is of a gradual change structure;
the top of the sprue is 70mm higher than the rudder skeleton titanium alloy casting to be molded to form a pouring pressure head;
the cross gate is arranged on two sides of the straight gate, the cross section of the cross gate is circular, and an angle of 25 degrees is formed between the cross gate and the straight gate;
the diameter of the horizontal pouring gate is 50mm, and the number of the horizontal pouring gate is 10;
the inner pouring gate is connected with the cross pouring gate and the rudder skeleton titanium alloy casting to be formed and is of a cylindrical structure;
the diameter of the inner pouring gate is 50mm, and the length of the inner pouring gate is 70 mm;
a riser is designed at the top of the rudder skeleton titanium-like alloy casting to be formed, and the riser is of a planar structure;
the height of the riser is 60mm, the width of the riser is 100mm, the bottom size of the riser is equal to the top size of the rudder skeleton titanium alloy casting to be molded, and the thickness of the riser is 20 mm.
Compared with the prior art, the invention has the advantages that:
1. aiming at large complex rudder skeleton castings, a bottom pouring type pouring process is adopted, and the rudder skeleton castings are obliquely placed. The titanium alloy liquid firstly impacts the bottom cross gate from the top through the sprue and then stably flows into the casting mold through the ingate, the mold filling process is stable, the surface of the casting mold is slightly eroded, and the gas storage pouring gate is designed at the bottom end of the cross gate, so that the gas in the casting can be reduced, and the internal quality of the casting can be improved.
2. Aiming at large castings, a pouring pressure head is designed at the top of a sprue, so that the casting mold can be completely filled in the mold filling process, and the internal quality of the castings is improved.
3. A casting head is designed at the top of the casting, so that sequential solidification of the casting is facilitated, the internal quality of the casting is improved, and the qualification rate of X-ray one-time shooting inside the casting reaches 100%.
4. The rudder skeleton casting adopts the slope form to place, compares traditional mode of keeping flat, and casting shaping efficiency is higher, and it is more convenient to supply the shrinkage, is showing the tendency that has reduced the shrinkage cavity shrinkage porosity defect and has produced.
5. The outer die of the casting is inclined and assembled, the sliding is easy to occur, and the baffle mechanism is additionally arranged on the outer side of the outer die, so that the sliding of the outer die is effectively prevented, the assembly is firm, and the safety in the casting process is facilitated.
6. The casting mold outer mold is of a split structure, the middle of the casting mold outer mold is tightly pressed and fixed, the outer mold can be recycled for many times after being formed in a split mode, and the use cost of the graphite mold is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a flow chart of steps of a titanium-like alloy casting method for a large complex rudder frame according to an embodiment of the present invention;
fig. 2 is a schematic view of a graphite mold according to an embodiment of the present invention;
fig. 3 is a schematic view of an assembled graphite mold for a titanium alloy casting of a large complex rudder frame according to an embodiment of the present invention;
FIG. 4 is a schematic view of a solid large complex rudder frame titanium alloy casting provided by an embodiment of the invention;
fig. 5 is a schematic view of a titanium alloy casting of a large complex rudder frame according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive efforts based on the embodiments of the present invention, belong to the scope of protection of the embodiments of the present invention.
Referring to fig. 1, a flow chart of steps of a titanium-like alloy casting method for a large complex rudder framework provided by an embodiment of the invention is shown.
As shown in fig. 1, the method for casting titanium-like alloy of the large complex rudder frame may specifically include the following steps:
step 101: and designing a bottom pouring type pouring system according to the structural characteristics of the rudder skeleton titanium alloy casting to be formed.
The embodiment of the invention can be applied to the scene of casting large-scale complex rudder framework titanium alloy.
Step 102: penetrating the sprue from the top to the bottom of the bottom-pouring gating system.
Firstly, a bottom pouring type pouring system can be designed according to the structural characteristics of a rudder skeleton titanium alloy casting to be formed (as shown in fig. 5), and the casting is obliquely placed. The sprue runs through the bottom from the top, the diameter of the top of the sprue is 100mm, the diameter of the bottom of the sprue is 90mm, the middle of the sprue is of a gradual change structure, and the top of the sprue is 70mm higher than a casting to form a pouring pressure head. The cross gate is arranged at two sides of the sprue, the cross section of the cross gate is circular, an angle of 25 degrees is formed between the cross gate and the sprue, the diameter of the cross gate is 50mm, and the number of the cross gate is 10. The ingate is connected with the horizontal pouring gate and the casting and is of a cylindrical structure, the diameter of the ingate is 50mm, and the length of the ingate is 70 mm. The top of the casting is provided with a riser which is of a planar structure, the height of the riser is 60mm, the width of the riser is 100mm, the draft angle of the die is-8 degrees, the bottom of the riser is equal to the top of the casting, and the thickness of the riser is 20 mm.
Step 103: and generating the graphite mold by a software difference solving mode according to the bottom pouring type pouring system.
And generating a graphite mold diagram by a software difference solving mode according to the designed gating system. As shown in FIG. 2, the cast graphite mold consists of a main pouring channel 1, a bottom plate 2, a ferrule 3, an outer mold 4, a gasket 5 and a cushion block 6. The main pouring channel is divided into a left part and a right part, five holes are sequentially formed from top to bottom, the diameter of each hole is 50mm, the diameter of the bottom of the main pouring channel is 150mm, and the main pouring channel is assembled and fixed on the bottom plate through a concave-convex structure. The inner diameter of the bottom plate is 150mm, and the outer diameter is 30mm larger than the inner diameter and is 180 mm. The diameter of the ferrule is 50mm, and the main pouring gate is connected with the outer die through the ferrule; the outer mold is divided into an upper part and a lower part, four holes are sequentially formed in the periphery of the outer mold, the diameter of each hole is 15mm, and the outer mold is assembled and fixed through bolts. The gasket length is 50mm, and the width is 50mm, and thickness is 5mm, and the external mold passes through the gasket assembly. The cushion block is of a step-shaped structure, the inclination angle of the cushion block and the outer die is 25 degrees, the heights of two sides of the cushion block are 160mm and 90mm respectively, the width of the cushion block is 150mm, and the outer die is matched with the main pouring gate through the cushion block.
Step 104: the graphite mold enters a degassing furnace at normal temperature for degassing; the vacuum degree of the degassing furnace is less than 3 Pa.
Degassing the machined graphite mold in a degassing furnace, putting the graphite mold into the furnace at normal temperature, vacuumizing until the vacuum degree of the degassing furnace is less than or equal to 2Pa, heating to 700 ℃ after 2.5 hours, preserving heat for 1.5 hours, heating to 900 ℃ after 1.5 hours, preserving heat for 5 hours, cooling to 350 ℃ along with the furnace, and discharging.
Step 105: assembling and combining the degassed split graphite mold.
Assembling the degassed graphite mold according to a mold assembly drawing. Fixing a bottom plate on a bottom plate of the titanium alloy skull furnace, then installing a main pouring gate on the bottom plate, and embedding the lower part of the main pouring gate into a concave part inside a convex structure of the bottom plate; the outer mold is arranged on the cushion block in an inclined shape and is connected with the main pouring gate through a ferrule; and sequentially installing a gasket and the other outer mold on the outer mold, connecting the gasket and the other outer mold by using a ferrule and a main pouring gate, repeating the steps for 5 times to form a mold assembly mode of stacking 5 outer molds, wherein a baffle mechanism is arranged on the outer side of each outer mold to prevent the outer molds from sideslipping. After the outer die on one side is installed, the outer die on the other side is installed in the same way, and the two outer dies are pressed and fixed.
Step 106: and putting the graphite mold after assembly into a titanium alloy skull furnace, extracting a vacuum melting titanium alloy ingot, and pouring to form so as to generate a formed rudder skeleton titanium alloy casting.
And (3) placing the assembled graphite mold and the skull furnace bottom plate into a titanium alloy smelting furnace, and positioning through the skull furnace bottom plate to ensure that a graphite mold sprue gate and a sprue cup are nested in the same way. Vacuumizing, starting to smelt when the vacuum degree is less than or equal to 1Pa, melting a titanium alloy ingot, pouring to form a casting, and finally forming the solid large complex rudder skeleton titanium alloy casting as shown in figure 4.
According to the production method of the titanium alloy casting, the titanium alloy cabin casting (as shown in figure 3) is prepared, the internal quality of the casting meets the requirement of I type castings in GJB 2896A-2007, the first-time qualified rate of X-ray detection is 100%, and the actual use effect is excellent.
The casting is placed in an inclined mode, a certain angle is formed between the cushion block and the main pouring gate, and a furnace and multiple pieces are poured simultaneously through the gasket.
The graphite mould can comprise a main pouring gate, a bottom plate, a ferrule, an outer mould, a gasket and a cushion block; the main pouring gate is divided into a left part and a right part, five holes are sequentially formed from top to bottom, the aperture of the main pouring gate is 40-50 mm, and the main pouring gate is assembled and fixed on the bottom plate through a concave-convex structure.
The inner diameter of the bottom plate is equal to the diameter of the lower part of the main pouring channel, and the outer diameter of the bottom plate is 15-30 mm larger than the inner diameter; the diameter of the ferrule is 35-50 mm, and the main pouring gate is connected with the outer die through the ferrule.
The outer mold is divided into an upper part and a lower part, four holes are sequentially formed in the periphery of the outer mold, the hole diameter is 10-15 mm, and the outer mold is assembled and fixed through bolts.
The length of the gasket is 40-60 mm, the width of the gasket is 40-60 mm, the thickness of the gasket is 5-10 mm, and the outer die is assembled through the gasket; the cushion block is of a step-shaped structure, and the angle of the cushion block is consistent with the inclination angle of the outer die and is 20-30 degrees.
The heights of the two sides of the cushion block are respectively 100-200 mm and 60-100 mm, the width of the cushion block is 130-160 mm, and the outer die is matched with the main pouring gate through the cushion block.
Preferably, the bottom plate is assembled and fixed on the bottom plate of the titanium alloy skull furnace, so that the sprue is nested with the sprue cup.
Preferably, the bottom-pouring gating system may include a sprue, a runner, an ingate, a pattern and a riser.
The sprue runs through the bottom from the top, the size of the top of the sprue is larger than that of the bottom, and the top of the sprue is higher than the height of the top of the casting to form a pouring pressure head.
The cross gate is arranged on two sides of the sprue, the cross section is circular, and the cross gate and the sprue form an angle consistent with the inclination angle of the rudder skeleton.
The ingate is connected with the horizontal pouring gate and the casting and has a cylindrical structure.
The riser is arranged at the top of the casting and has a planar structure, and the size of the bottom of the riser is equal to that of the top of the casting; the draft angle is-5 to-10 degrees.
Preferably, the number of runners is 8-12.
Preferably, the graphite mold is heated to 650-750 ℃ in a degassing furnace for 2-3 hours, is subjected to heat preservation for 1-2 hours, is heated to 850-950 ℃ in 1-2 hours, is subjected to heat preservation for 4-6 hours, and is cooled to below 400 ℃ along with the furnace to be discharged.
The pouring system designed by the invention obviously improves the internal quality of the large-scale complex rudder framework titanium alloy castings and is suitable for the castings with I-type requirements of aerospace and the like. The tilting rudder skeleton casting process designed and manufactured by the invention can be applied to the manufacturing production of similar products, can improve the feeding efficiency of castings, reduces the production cost of moulds, and has remarkable economic benefit.
The embodiment of the invention has the following beneficial effects:
1. aiming at large complex rudder skeleton castings, a bottom pouring type pouring process is adopted, and the rudder skeleton castings are obliquely placed. The titanium alloy liquid firstly impacts the bottom cross gate from the top through the sprue and then stably flows into the casting mold through the ingate, the mold filling process is stable, the surface of the casting mold is slightly eroded, and the gas storage pouring gate is designed at the bottom end of the cross gate, so that the gas in the casting can be reduced, and the internal quality of the casting can be improved.
2. Aiming at large castings, a pouring pressure head is designed at the top of a sprue, so that the casting mold can be completely filled in the mold filling process, and the internal quality of the castings is improved.
3. A casting head is designed at the top of the casting, so that sequential solidification of the casting is facilitated, the internal quality of the casting is improved, and the qualification rate of X-ray one-time shooting inside the casting reaches 100%.
4. The rudder skeleton casting adopts the slope form to place, compares traditional mode of keeping flat, and casting shaping efficiency is higher, and it is more convenient to supply the shrinkage, is showing the tendency that has reduced the shrinkage cavity shrinkage porosity defect and has produced.
5. The outer die of the casting is inclined and assembled, the sliding is easy to occur, and the baffle mechanism is additionally arranged on the outer side of the outer die, so that the sliding of the outer die is effectively prevented, the assembly is firm, and the safety in the casting process is facilitated.
6. The casting mold outer mold is of a split structure, the middle of the casting mold outer mold is tightly pressed and fixed, the outer mold can be recycled for many times after being formed in a split mode, and the use cost of the graphite mold is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the embodiments of the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the embodiments of the present invention are included in the scope of the embodiments of the present invention.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (8)
1. A large-scale complicated rudder skeleton titanium alloy casting method is characterized by comprising the following steps:
designing a pouring system according to the structural characteristics of the rudder skeleton titanium alloy casting to be formed;
generating a graphite mold through a software difference solving mode according to the pouring system;
the graphite mold enters a degassing furnace at normal temperature for degassing; the vacuum degree of the degassing furnace is less than 3 Pa;
assembling and combining the degassed split graphite molds;
putting the graphite mold after assembly into a titanium alloy skull furnace, extracting a vacuum melting titanium alloy ingot and pouring to form so as to generate a formed rudder skeleton titanium alloy casting;
the graphite mold includes: a main pouring channel, a bottom plate, a ferrule, an external mold, a gasket and a cushion block, wherein,
five circular holes are sequentially formed in the main pouring gate from top to bottom, and the bottom of the main pouring gate is assembled and fixed on the bottom plate through a concave-convex structure;
two side surfaces of the main pouring gate are connected with a plurality of outer molds which are stacked and obliquely arranged through the ferrules;
adjacent two of the external molds on each side are assembled and connected through the gasket;
the bottom ends of the external molds on each side are obliquely arranged through the cushion blocks;
the outer die is matched with the main pouring gate through the cushion block;
the gating system includes: a sprue, a cross gate, an ingate, a drawing die and a riser, wherein,
the sprue penetrates from the top to the bottom, the size of the top of the sprue is larger than that of the bottom, and the top of the sprue is higher than the height of the top of the casting to form a pouring pressure head;
the cross gate is arranged on two sides of the straight gate, the cross section of the cross gate is circular, and an angle is formed between the cross gate and the straight gate and is consistent with the inclination angle of the rudder skeleton titanium alloy casting to be molded;
the ingate is connected with the horizontal pouring gate and the casting and has a cylindrical structure;
the riser is arranged at the top of the casting and is planar in structure, and the size of the bottom of the riser is equal to that of the top of the casting;
the inclination of the drawing die is-5 to-10 degrees.
2. The method according to claim 1, wherein the rudder skeleton titanium alloy casting to be formed is placed in an inclined manner, and forms an angle with the main pouring channel through a cushion block.
3. The method of claim 1, wherein the floor assembly is secured to the titanium alloy skull furnace floor such that the sprue is nested with the sprue cup.
4. The method according to claim 1, wherein the graphite mold is heated to 650-750 ℃ in the degassing furnace for 2-3 hours, is subjected to heat preservation for 1-2 hours, is heated to 850-950 ℃ in 1-2 hours, is subjected to heat preservation for 4-6 hours, and is cooled to below 400 ℃ along with the furnace to be discharged.
5. The method of claim 1, wherein assembling the degassed graphite molds of the sub-assemblies comprises:
assembling the degassed graphite mold according to a mold assembly drawing;
fixing the bottom plate on the bottom plate of the titanium alloy skull furnace;
assembling the main pouring gate on the bottom plate, wherein the lower part of the main pouring gate is embedded into the concave part inside the convex structure of the bottom plate;
the outer die is arranged on the cushion block in an inclined shape and is connected with the main pouring gate through a ferrule;
and sequentially installing a gasket and the other outer mold on the outer mold, connecting the gasket and the main pouring gate by using a ferrule, and repeating for 4 times to form a mold assembly mode of stacking 5 outer molds.
6. The method according to claim 1, wherein the number of the runners is 8 to 12.
7. The method of claim 1, wherein the blocks are stepped in configuration at an angle consistent with the angle of inclination of the outer die of 25 °;
the heights of the two sides of the cushion block are respectively 160mm and 90mm, and the width of the cushion block is 150 mm;
the length of the gasket is 50mm, the width of the gasket is 50mm, and the thickness of the gasket is 5 mm;
the diameter of the round hole is 50mm, and the diameter of the bottom of the main pouring gate is 150 mm;
the inner diameter of the bottom plate is 150mm, and the outer diameter of the bottom plate is 30mm larger than the inner diameter and is 180 mm;
the diameter of the ferrule is 50 mm;
the outer die is divided into an upper part and a lower part, four holes are sequentially formed in the periphery of the outer die, and the diameter of each hole is 15 mm.
8. The process according to claim 1, characterized in that the sprue top has a diameter of 100mm, the bottom has a diameter of 90mm and the middle has a tapered structure;
the top of the sprue is 70mm higher than the rudder skeleton titanium alloy casting to be molded to form a pouring pressure head;
the cross gate is arranged on two sides of the straight gate, the cross section of the cross gate is circular, and an angle of 25 degrees is formed between the cross gate and the straight gate;
the diameter of the horizontal pouring gate is 50mm, and the number of the horizontal pouring gate is 10;
the inner pouring gate is connected with the cross pouring gate and the rudder skeleton titanium alloy casting to be formed and is of a cylindrical structure;
the diameter of the inner pouring gate is 50mm, and the length of the inner pouring gate is 70 mm;
a riser is designed at the top of the rudder skeleton titanium-like alloy casting to be formed, and the riser is of a planar structure;
the height of the riser is 60mm, the width of the riser is 100mm, the bottom size of the riser is equal to the top size of the rudder skeleton titanium alloy casting to be molded, and the thickness of the riser is 20 mm.
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