CN114713775B - Preparation method of large cylindrical titanium casting with opening - Google Patents
Preparation method of large cylindrical titanium casting with opening Download PDFInfo
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- CN114713775B CN114713775B CN202210311453.0A CN202210311453A CN114713775B CN 114713775 B CN114713775 B CN 114713775B CN 202210311453 A CN202210311453 A CN 202210311453A CN 114713775 B CN114713775 B CN 114713775B
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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
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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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
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
- B22D31/002—Cleaning, working on castings
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- Engineering & Computer Science (AREA)
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Abstract
The preparation method of large-scale cylindrical titanium casting with opening, make the casting mold according to shape and size of the cylindrical titanium casting at first, appearance and cavity of the casting mold are all matched with cylindrical titanium casting, and expand the space of cavity corresponding to opening border of the cylindrical titanium casting of the casting mold along radial direction, in order to guarantee the opening border of the cylindrical titanium casting of the casting molding thickens at least 2mm; then connecting the casting mould and the casting furnace to form a casting system, arranging a plurality of reinforcing ribs at the opening part of the casting mould, and arranging reinforcing rib pouring channels connected with the casting system in the reinforcing ribs; and (3) pouring and molding in a pouring mold, cooling, disassembling the pouring mold, and machining the thickened part of the edge of the opening of the cylindrical titanium casting to obtain the large cylindrical titanium casting with the opening. The adverse effects of deformation and shrinkage unevenness of the casting can be reduced, and the subsequent repair welding treatment of the casting is effectively reduced.
Description
Technical Field
The invention relates to the field of preparation of cylindrical titanium castings, in particular to a preparation method of a large cylindrical titanium casting with an opening.
Background
The titanium alloy has high strength and specific strength, but has large viscosity, poor fluidity and poor thermal conductivity, and the titanium alloy casting product not only needs to consider mechanical properties, but also needs to consider casting and welding properties; the titanium alloy casting has coarse structure and casting defects such as looseness, inclusion, segregation and the like, so the cast titanium alloy has larger difference from the processed titanium material, and the cast titanium alloy has lower mechanical property and poorer plasticity. However, the cast titanium alloy has better heat resistance, the use temperature of the cast titanium alloy is higher than that of the deformed titanium alloy, the cast titanium alloy produced industrially can be used below 550 ℃ at the highest, for example, the cast TC4 alloy with the largest use amount has medium strength and good comprehensive mechanical property, the casting property is excellent, the welding property is good, and the cast titanium alloy can work below 350 ℃ for a long time in an annealed state.
Large titanium castings with complex structures, such as large cylindrical titanium castings with openings, have high casting difficulty because defects such as cracks, shrinkage porosity, looseness, holes, inclusions, cold barriers and the like in titanium alloy castings are unavoidable, the defects influence the performance of the castings and become hidden danger of casting failure, the wall thickness of the titanium alloy castings has certain influence on mechanical properties, particularly in the aspect of plasticity, thin-wall castings have high tensile strength and low plasticity, thin-wall parts are fast to cool and easily form fast cooling structures, and dispersed loose defects tend to form, so that the casting and filling difficulty of the large thin-wall castings is high. The large cylindrical titanium casting with the opening has an open structure, is large in diameter, long in length, uneven in wall thickness and thin in minimum thickness, has larger structural stress after casting and cooling, is easy to generate deformation and other casting defects, and particularly is easy to generate deformation or casting shrinkage at the opening position of the cylindrical titanium casting, and the problems are difficult to avoid in the prior art, so that the casting quality of the large cylindrical titanium casting with the opening is lower, and the subsequent repair welding treatment is needed.
Disclosure of Invention
The invention provides a preparation method of a large cylindrical titanium casting with an opening, which aims to solve the problem that the casting quality of the large cylindrical titanium casting with the opening is lower.
The technical scheme adopted by the invention for solving the technical problems is as follows: a preparation method of a large cylindrical titanium casting with an opening, wherein the cylindrical titanium casting comprises a cylinder body with the diameter not smaller than 500mm and the length not smaller than 1000mm, a rectangular opening is formed in the side wall of the cylinder body, a casting mold is firstly manufactured according to the shape and the size of the cylindrical titanium casting, the shape and the inner cavity of the casting mold are matched with those of the cylindrical titanium casting, and the inner cavity space of the casting mold corresponding to the opening edge of the cylindrical titanium casting is expanded in the radial direction so as to ensure that the thickness of the opening edge of the cast cylindrical titanium casting is increased by at least 2mm; then connecting the casting mould and the casting furnace to form a casting system, arranging a plurality of reinforcing ribs at the opening part of the casting mould, and arranging reinforcing rib pouring channels connected with the casting system in the reinforcing ribs; and (3) pouring and molding in a pouring mold, cooling, disassembling the pouring mold, and machining the thickened part of the edge of the opening of the cylindrical titanium casting to obtain the large cylindrical titanium casting with the opening.
Preferably, the casting mold adopts a graphite mold or a graphite appearance plus investment core mold.
Preferably, the pouring system is a three-layer internal pouring system, and two layers of inner pouring channels respectively positioned at different heights are arranged in the pouring mould.
Preferably, the pouring system is a double-layer external pouring system, and an outer pouring channel surrounding the pouring mould is arranged outside the pouring mould.
Preferably, the interval between two adjacent reinforcing ribs along the length direction of the cylinder body is 100-200mm.
According to the technical scheme, the invention has the beneficial effects that:
according to the invention, the inner cavity space of the casting mold corresponding to the opening edge of the cylindrical titanium casting is enlarged along the radial direction, so that the opening edge of the cast cylindrical titanium casting is thickened by at least 2mm, and the opening edge of the cylindrical titanium casting belongs to a deformation-prone area in the casting process. The invention also arranges a plurality of reinforcing ribs at the opening part of the casting mold, and arranges a reinforcing rib runner in the reinforcing ribs, thereby effectively preventing the opening part from opening deformation due to cooling shrinkage, and ensuring the opening part to be fully cast. The invention can reduce the adverse effects of the deformation and the uneven shrinkage of the casting, prepare the large cylindrical titanium casting with the length exceeding 1000mm and the large cylindrical titanium casting with the opening structure, improve the casting quality and effectively reduce the subsequent repair welding treatment of the casting.
Drawings
FIG. 1 is a schematic diagram of a three-layer internal casting system;
FIG. 2 is a schematic view of the location of a stiffener;
fig. 3 is a schematic diagram of a dual layer external casting system.
The marks in the figure: 1. reinforcing rib pouring gate, 2, inner layer pouring gate, 3, a die body, 4, reinforcing rib strips, 5 and outer layer pouring gate.
Detailed Description
Referring to the drawings, the specific embodiments are as follows:
a preparation method of a large cylindrical titanium casting with an opening comprises the steps that the cylindrical titanium casting comprises a cylinder body with the diameter not smaller than 500mm and the length not smaller than 1000mm, and a rectangular opening is formed in the side wall of the cylinder body.
Firstly, manufacturing a casting mold according to the shape and the size of a cylindrical titanium casting, wherein the casting mold adopts a graphite mold or a graphite appearance plus an investment core mold, the appearance and the inner cavity of the casting mold are matched with the cylindrical titanium casting, and the inner cavity space of the casting mold corresponding to the opening edge of the cylindrical titanium casting is expanded in the radial direction so as to ensure that the thickness of the opening edge of the cast cylindrical titanium casting is increased by at least 2mm.
And then connecting the casting mold and the casting furnace to form a casting system, arranging a plurality of reinforcing ribs at the opening part of the casting mold, and arranging a reinforcing rib runner connected with the casting system in the reinforcing ribs.
And then casting and forming are carried out in the casting mold, the casting mold is disassembled after cooling, and the thickened part of the opening edge of the cylindrical titanium casting is machined, so that the large cylindrical titanium casting with the opening is obtained.
Example 1:
the novel high-temperature resistant ZTi700SR titanium alloy (with the tensile strength of more than 300MPa at the temperature of 750 ℃) is prepared by adopting a twice smelting process of a vacuum consumable furnace, the weight of cast ingots is 500kg, the contents of components and impurities meet the requirements, a large irregular long cylindrical titanium casting is prepared by adopting a casting mode of a vacuum skull furnace, the diameter phi of one end of the casting is 600mm, the diameter phi of the other end of the casting is 720mm, the length of the casting is 1500mm, the thickness near an opening of the casting is thinnest (3 mm), the two ends of a cylinder are thickest (about 28 mm), and the thickness of other areas gradually transits between 3mm and 28 mm.
The casting mold is formed by matching a plurality of mold bodies 3, graphite mold molds are used at the inner part and the outer part, a mold core is firstly placed on a lower mold during mold assembly, the mold is assembled according to a mold core assembly drawing, then an upper mold is installed, if no mold core exists, the upper mold is directly placed on the lower mold, then the mold is integrally placed on a disc-shaped fixed table, and the fixed table can perform centrifugal rotation; the inner cavity space of the pouring mold corresponding to the opening edge of the cylindrical titanium casting is enlarged along the radial direction, so that the opening edge of the cylindrical titanium casting is thickened by 3mm, and the self-consumption skull casting furnace is adopted for static horizontal casting.
As shown in fig. 1 and 2, the pouring system is a three-layer internal pouring system, two layers of inner pouring channels 2 respectively positioned at different heights are arranged in the pouring mould, and the upper part and the bottom are simultaneously poured, so that the mold filling integrity of the casting is ensured.
As shown in fig. 1 and 2, 8 ribs and 4 annular reinforcing ribs are respectively arranged at the upper part and the lower part of the casting mold, dense pouring channels are arranged on the surface of the pouring channels, a pouring channel with the diameter of 35mm is arranged on the standard area with the density of 180 x 180mm, reinforcing ribs 4 with the cross sections of 25 x 25mm are arranged at intervals of 120mm at the opening of the casting, and reinforcing rib pouring channels 1 are arranged in the reinforcing ribs 4.
And (3) rapidly melting the cast ingot in a vacuum skull furnace, carrying out preheating treatment at 350 ℃ on the graphite mold before pouring, pouring the molten liquid into the graphite mold within 10 seconds during pouring, and carrying out 60-rotation/min rotation on the graphite mold and a fixed platform during pouring, so that the mold filling integrity of the cast is enhanced. Cooling, disassembling the casting mold, and machining the thickened part of the opening edge of the cylindrical titanium casting to obtain the large cylindrical titanium casting with the opening
Example 2:
the novel high-temperature resistant ZTi700SR titanium alloy (with the tensile strength of more than 300MPa at 750 ℃) is prepared by adopting a twice smelting process of a vacuum consumable-hearth furnace, the weight of cast ingot is 500kg, the contents of components and impurities meet the requirements, and a large irregular long cylindrical titanium casting is prepared by adopting a pouring mode of a vacuum skull furnace, wherein the casting is provided with an opening area and a window.
The casting mold is formed by matching a plurality of mold bodies 3, the exterior is a machined graphite mold, a yttrium oxide composite mold shell is used in the exterior, when the mold shell is prepared, corundum, mullite sand, yttrium oxide and silica sol are coated on the wax mold for multilayer preparation, then the mold shell is dried, baked and surface treated, the air permeability and the yield are improved while the room temperature strength and the high temperature strength are ensured, and the formation of casting defects is reduced.
When the casting mold is assembled, firstly, the mold core is placed on the lower mold, the assembly is carried out according to the mold core assembly drawing, then, the upper mold is installed, if no mold core exists, the upper mold is directly placed on the lower mold, and then, the mold core is integrally placed on a disc-shaped fixed table which can carry out centrifugal rotation; the inner cavity space of the pouring mold corresponding to the opening edge of the cylindrical titanium casting is enlarged along the radial direction, so that the opening edge of the cylindrical titanium casting is thickened by 3mm, and the self-consumption skull casting furnace is adopted for static horizontal casting.
As shown in fig. 3, the pouring system is a double-layer external pouring system, an external pouring channel 5 surrounding the pouring mould is arranged outside the pouring mould, and the upper part and the bottom part are simultaneously poured, so that good filling performance is ensured.
As shown in fig. 3, 4 reinforcing ribs are arranged at the middle lower part of the pouring system, 4 annular rib plates are arranged at the lower part of the pouring system, deformation-preventing rib plates with the cross sections of 35mm multiplied by 35mm are arranged at the openings of castings at intervals of 200mm, dense pouring channels are arranged on the surfaces of the pouring channels, and the pouring channels with the diameters of 35mm are arranged on the standard area with the density of 150mm multiplied by 150 mm; reinforcing rib strips 4 with the cross sections of 35 multiplied by 35mm are arranged at the opening of the casting at intervals of 200mm, and reinforcing rib pouring channels 1 are arranged in the reinforcing rib strips 4.
And (3) rapidly melting the cast ingot in a vacuum skull furnace, pouring the molten liquid into a die within 10 seconds during pouring, and rotating the die and a platform for 60 revolutions per minute during pouring to strengthen the mold filling integrity of the cast. And (3) after cooling, disassembling the casting mold, and machining the thickened part of the edge of the opening of the cylindrical titanium casting to obtain the large cylindrical titanium casting with the opening.
Claims (5)
1. The preparation method of the large cylindrical titanium casting with the rectangular opening comprises the steps that the cylindrical titanium casting comprises a cylinder body with the diameter not smaller than 500mm and the length not smaller than 1000mm, and the rectangular opening is formed in the side wall of the cylinder body, and the preparation method is characterized in that: firstly, manufacturing a casting mold according to the shape and the size of a cylindrical titanium casting, wherein the shape and the inner cavity of the casting mold are matched with those of the cylindrical titanium casting, and expanding the inner cavity space of the casting mold corresponding to the rectangular opening edge of the cylindrical titanium casting along the radial direction so as to ensure that the rectangular opening edge of the cast cylindrical titanium casting is thickened by at least 2mm; then connecting the casting mould and the casting furnace to form a casting system, arranging a plurality of reinforcing ribs at rectangular opening parts of the casting mould, and arranging reinforcing rib pouring channels connected with the casting system in the reinforcing ribs; and (3) pouring and molding in a pouring mold, cooling, disassembling the pouring mold, and machining the thickened part of the rectangular opening edge of the cylindrical titanium casting to obtain the large cylindrical titanium casting with the rectangular opening.
2. The method for preparing a large cylindrical titanium casting with a rectangular opening according to claim 1, wherein the method comprises the following steps: the casting mold adopts a graphite mold or a graphite appearance and investment core mold.
3. The method for preparing a large cylindrical titanium casting with a rectangular opening according to claim 1, wherein the method comprises the following steps: the pouring system is a three-layer internal pouring system, and two layers of inner pouring channels respectively positioned at different heights are arranged in the pouring mould.
4. The method for preparing a large cylindrical titanium casting with a rectangular opening according to claim 1, wherein the method comprises the following steps: the pouring system is a double-layer external pouring system, and an outer pouring channel surrounding the pouring mould is arranged outside the pouring mould.
5. The method for preparing a large cylindrical titanium casting with a rectangular opening according to claim 1, wherein the method comprises the following steps: the interval between two adjacent reinforcing ribs along the length direction of the cylinder body is 100-200mm.
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| CN202210311453.0A CN114713775B (en) | 2022-03-28 | 2022-03-28 | Preparation method of large cylindrical titanium casting with opening |
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| CN202210311453.0A CN114713775B (en) | 2022-03-28 | 2022-03-28 | Preparation method of large cylindrical titanium casting with opening |
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| CN114713775B true CN114713775B (en) | 2024-01-19 |
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| CN118875224A (en) * | 2024-09-30 | 2024-11-01 | 洛阳双瑞精铸钛业有限公司 | A method for preparing high temperature resistant titanium alloy casting |
Citations (6)
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| JP2004351942A (en) * | 2003-04-04 | 2004-12-16 | Topy Ind Ltd | Manufacturing method of vehicular wheel |
| CN103658548A (en) * | 2012-09-21 | 2014-03-26 | 上海航天精密机械研究所 | Graphite type casting method of cylindrical titanium alloy piece |
| CN105880527A (en) * | 2016-06-01 | 2016-08-24 | 洛阳双瑞精铸钛业有限公司 | Forming method for large thin-walled skin-coated ribbed plate titanium castings |
| CN111076996A (en) * | 2019-12-20 | 2020-04-28 | 洛阳双瑞精铸钛业有限公司 | Crack tendency testing method for large thin-wall titanium casting prepared from high-temperature titanium alloy |
| CN112338144A (en) * | 2020-10-27 | 2021-02-09 | 洛阳双瑞精铸钛业有限公司 | Investment precision casting method for open impeller of titanium alloy |
| CN112683644A (en) * | 2020-11-30 | 2021-04-20 | 洛阳双瑞精铸钛业有限公司 | Sealing tool for pressure test of large cylindrical titanium casting |
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- 2022-03-28 CN CN202210311453.0A patent/CN114713775B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004351942A (en) * | 2003-04-04 | 2004-12-16 | Topy Ind Ltd | Manufacturing method of vehicular wheel |
| CN103658548A (en) * | 2012-09-21 | 2014-03-26 | 上海航天精密机械研究所 | Graphite type casting method of cylindrical titanium alloy piece |
| CN105880527A (en) * | 2016-06-01 | 2016-08-24 | 洛阳双瑞精铸钛业有限公司 | Forming method for large thin-walled skin-coated ribbed plate titanium castings |
| CN111076996A (en) * | 2019-12-20 | 2020-04-28 | 洛阳双瑞精铸钛业有限公司 | Crack tendency testing method for large thin-wall titanium casting prepared from high-temperature titanium alloy |
| CN112338144A (en) * | 2020-10-27 | 2021-02-09 | 洛阳双瑞精铸钛业有限公司 | Investment precision casting method for open impeller of titanium alloy |
| CN112683644A (en) * | 2020-11-30 | 2021-04-20 | 洛阳双瑞精铸钛业有限公司 | Sealing tool for pressure test of large cylindrical titanium casting |
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