CN114713775A - Preparation method of large cylindrical titanium casting with opening - Google Patents
Preparation method of large cylindrical titanium casting with opening Download PDFInfo
- Publication number
- CN114713775A CN114713775A CN202210311453.0A CN202210311453A CN114713775A CN 114713775 A CN114713775 A CN 114713775A CN 202210311453 A CN202210311453 A CN 202210311453A CN 114713775 A CN114713775 A CN 114713775A
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- Prior art keywords
- casting
- mold
- pouring
- cylindrical titanium
- opening
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Links
- 238000005266 casting Methods 0.000 title claims abstract description 143
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 60
- 239000010936 titanium Substances 0.000 title claims abstract description 60
- 238000002360 preparation method Methods 0.000 title claims description 9
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000003754 machining Methods 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 229910002804 graphite Inorganic materials 0.000 claims description 11
- 239000010439 graphite Substances 0.000 claims description 11
- 238000003466 welding Methods 0.000 abstract description 5
- 230000002411 adverse Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 14
- 230000007547 defect Effects 0.000 description 6
- 210000003625 skull Anatomy 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- 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
Abstract
Firstly, manufacturing a pouring mold according to the shape and the size of the cylindrical titanium casting, wherein the shape and the inner cavity of the pouring mold are matched with the cylindrical titanium casting, and radially expanding the inner cavity space of the pouring mold corresponding to the opening edge of the cylindrical titanium casting so as to ensure that the thickness of the opening edge of the cylindrical titanium casting formed by pouring is increased by at least 2 mm; then connecting the casting mould and the casting furnace into a casting system, arranging a plurality of reinforcing ribs at the opening part of the casting mould, and arranging reinforcing rib runners connected with the casting system in the reinforcing ribs; and (3) casting and molding the casting mold, cooling, then 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. The adverse effects of deformation and uneven shrinkage of the casting can be reduced, and the subsequent repair welding treatment on 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 the mechanical property, but also needs to consider the casting and welding properties; the titanium alloy casting has thick texture and has casting defects of looseness, inclusion, segregation and the like, so that the cast titanium alloy has larger difference with a processed titanium material, and the cast titanium alloy has lower mechanical property and poorer plasticity. But the cast titanium alloy has better heat resistance, the service temperature of the cast titanium alloy is higher than that of the deformed titanium alloy, the cast titanium alloy produced in an industrialized mode can be used below 550 ℃, for example, the cast TC4 alloy with the largest using amount has medium strength and good comprehensive mechanical property, the casting performance is excellent, the welding performance is good, and the cast titanium alloy can work below 350 ℃ for a long time in an annealing state.
The casting difficulty of large titanium castings with complex structures, such as large cylindrical unequal-thickness titanium castings with openings, is very high, because the defects of cracks, shrinkage porosity, looseness, holes, inclusions, cold shut and the like in the titanium alloy castings are inevitable, the defects can influence the casting performance and become hidden troubles of casting failure, the wall thickness of the titanium alloy castings has certain influence on the mechanical performance, particularly in the aspect of plasticity, the thin-wall castings have high tensile strength and low plasticity, the thin-wall castings are cooled quickly and easily form quick-cooling tissues, and dispersed loose defects tend to form, so the casting and filling difficulty of the large thin-wall castings is very 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 large structural stress after casting and cooling, is easy to generate deformation and other casting defects, and is easy to deform or shrink in casting particularly at the opening position of the cylindrical titanium casting, but 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 low, and subsequent repair welding treatment is required.
Disclosure of Invention
The invention provides a preparation method of a large cylindrical titanium casting with an opening, aiming at solving the problem of low casting quality of the large cylindrical titanium casting with the opening.
The technical scheme adopted by the invention for solving the technical problems is as follows: a preparation method of a large-scale 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, a rectangular opening is formed in the side wall of the cylinder body, firstly, a pouring mold is manufactured according to the shape and the size of the cylindrical titanium casting, the shape and the inner cavity of the pouring mold are matched with the cylindrical titanium casting, and the inner cavity space of the pouring mold corresponding to the opening edge of the cylindrical titanium casting is radially expanded to ensure that the opening edge of the cylindrical titanium casting formed by pouring is thickened by at least 2 mm; then connecting the casting mould and the casting furnace into a casting system, arranging a plurality of reinforcing ribs at the opening part of the casting mould, and arranging a reinforcing rib runner connected with the casting system in the reinforcing rib; and (3) casting and molding the casting mold, cooling, then 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.
Preferably, the casting mold adopts a graphite mold or a graphite appearance and fired mold inner core mold.
Preferably, the pouring system is a three-layer internal pouring system, and two layers of inner-layer pouring gates which are respectively positioned at different heights are arranged in the pouring mold.
Preferably, the pouring system is a double-layer external pouring system, and an outer layer pouring gate surrounding the pouring mold is arranged outside the pouring mold.
Preferably, the interval between two adjacent reinforcing ribs along the length direction of the cylinder body is 100-200 mm.
According to the technical scheme, the invention has the beneficial effects that:
according to the invention, the inner cavity space of the pouring mold corresponding to the opening edge of the cylindrical titanium casting is radially expanded, so that the opening edge of the cylindrical titanium casting molded by pouring is thickened by at least 2mm, and the opening edge of the cylindrical titanium casting belongs to an easily-deformed area in the pouring process. The invention also arranges a plurality of reinforcing ribs at the opening part of the casting mould, and arranges a reinforcing rib runner in the reinforcing ribs, the reinforcing ribs can effectively prevent the opening part from opening and deforming due to cooling shrinkage, and the reinforcing rib runner can ensure that the opening part is fully cast. The method can reduce the adverse effects of deformation and uneven shrinkage of the casting, prepare the large-sized cylindrical titanium casting with the length of more than 1000mm and the large-sized cylindrical titanium casting with the opening structure, improve the casting quality and effectively reduce the subsequent repair welding treatment on the casting.
Drawings
FIG. 1 is a schematic view of a three-level internal gating system;
FIG. 2 is a schematic view of the location of the reinforcing bars;
FIG. 3 is a schematic view of a two-level external gating system.
The labels in the figure are: 1. reinforcing rib runner 2, inner layer runner 3, the mould body 4, reinforcing rib strip 5, outer layer runner.
Detailed Description
Referring to the drawings, the specific embodiments are as follows:
a preparation method of a large cylindrical titanium casting with an opening is provided, the cylindrical titanium casting comprises a cylinder body with the diameter not less than 500mm and the length not less than 1000mm, and a rectangular opening is formed in the side wall of the cylinder body.
Firstly, a pouring mold is manufactured according to the shape and the size of a cylindrical titanium casting, the pouring mold adopts a graphite mold or a graphite appearance and fired mold inner core mold, the appearance and the inner cavity of the pouring mold are matched with the cylindrical titanium casting, and the inner cavity space of the pouring mold corresponding to the opening edge of the cylindrical titanium casting is radially expanded so as to ensure that the opening edge of the cylindrical titanium casting molded by pouring is thickened by at least 2 mm.
And then connecting the casting mould and the casting furnace into a casting system, arranging a plurality of reinforcing ribs at the opening part of the casting mould, and arranging a reinforcing rib runner connected with the casting system in the reinforcing rib.
And then carrying out casting molding in the casting mold, cooling, then 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 1:
the novel high-temperature-resistant ZTi700SR titanium alloy (tensile strength of more than 300MPa at 750 ℃) is prepared by adopting a vacuum consumable furnace twice smelting process, the weight of an ingot is 500kg, the contents of components and impurities meet the requirements, a large irregular long cylindrical titanium casting is prepared by adopting a vacuum skull furnace pouring mode, the diameter phi 600mm at one end of the casting, the diameter phi 720mm at the other end of the casting and the length 1500mm are gradually changed, the thickness near the opening of the casting is thinnest (3 mm), the thickness at two ends of the cylinder is thickest (about 28 mm), and the thickness of other areas is gradually changed between 3mm and 28 mm.
The casting mould is formed by matching a plurality of mould bodies 3, graphite mould moulds are used on the inner part and the outer part, a mould core is firstly placed on a lower mould when a casting mould is assembled, the casting mould is assembled according to a mould core assembly drawing, then an upper mould is installed, if the mould core does not exist, the upper mould is directly placed on the lower mould, and then the whole casting mould is placed on a disc-shaped fixed table, and the fixed table can carry out centrifugal rotation; the inner cavity space of the pouring mould corresponding to the opening edge of the cylindrical titanium casting is radially expanded to thicken the opening edge of the cylindrical titanium casting by 3mm, and a consumable skull casting furnace is adopted for static horizontal casting.
As shown in fig. 1 and 2, the gating system is a three-layer internal gating system, two layers of inner-layer runners 2 which are respectively positioned at different heights are arranged in the casting mold, and the upper part and the bottom part are simultaneously cast, so that the filling integrity of the casting is ensured.
As shown in fig. 1 and fig. 2, 8 ribs and 4 annular reinforcing rib plates are respectively arranged at the upper part and the lower part of the casting mold, dense pouring channels are arranged on the surface of a runner, a pouring channel with the diameter of 35mm is arranged on the specification area with the density degree of 180 x 180mm, reinforcing ribs 4 with the sections of 25 x 25mm are arranged at the opening of a casting at intervals of 120mm, and reinforcing rib pouring channels 1 are arranged in the reinforcing ribs 4.
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 10s during pouring, and rotating the graphite mold and the fixed platform at 60 revolutions per minute during pouring to enhance the filling integrity of the casting. 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 (tensile strength of more than 300MPa at 750 ℃) is prepared by adopting a vacuum consumable furnace twice smelting process, the weight of a cast ingot is 500kg, the components and the impurity content meet the requirements, a large irregular long cylindrical titanium casting is prepared by adopting a vacuum skull furnace pouring mode, the casting is provided with an opening area, and the casting is provided with a window.
The pouring mould is formed by matching a plurality of mould bodies 3, a machining graphite mould is arranged outside the pouring mould, a yttrium oxide composite mould shell is used inside the pouring mould, when the mould shell is prepared, a plurality of layers of corundum, mullite sand, yttrium oxide and silica sol are sprayed on a wax mould for preparation, and then drying, roasting and surface treatment are carried out, so that the air permeability and deformability are improved, and the defect formation of a casting is reduced while the room temperature strength and the high temperature strength are ensured by the composite shell.
When the casting mold is assembled, a mold core is firstly placed on a lower mold, the mold core is assembled according to a mold core assembly drawing, then an upper mold is installed, if the mold core is not arranged, the upper mold is directly placed on the lower mold, then the upper mold is integrally placed on a disc-shaped fixed table, and the fixed table can carry out centrifugal rotation; the inner cavity space of the pouring mould corresponding to the opening edge of the cylindrical titanium casting is radially expanded to thicken the opening edge of the cylindrical titanium casting by 3mm, and a consumable skull casting furnace is adopted for static horizontal casting.
As shown in fig. 3, the gating system is a double-layer external gating system, an outer layer pouring gate 5 surrounding the gating mold is arranged outside the gating mold, and the upper part and the bottom part are simultaneously cast, so that good filling performance is ensured.
As shown in fig. 3, 4 reinforcing ribs are arranged at the middle lower part of the gating system, 4 annular rib plates are arranged at the lower part of the gating system, anti-deformation rib plates with 35 x 35mm cross sections are arranged at the opening of the casting at intervals of 200mm, dense runners are arranged on the surfaces of the runners, and a runner with the diameter of 35mm is arranged on the area with the density of 150 x 150 mm; reinforcing ribs 4 with 35 multiplied by 35mm cross sections are arranged at the opening of the casting at intervals of 200mm, and reinforcing rib runners 1 are arranged inside the reinforcing ribs 4.
And rapidly melting the cast ingot in a vacuum skull furnace, pouring the molten liquid into a mold within 10s during pouring, and rotating the mold and the platform at 60 revolutions per minute during pouring to enhance the mold filling integrity of the casting. And 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.
Claims (5)
1. The preparation method of the large cylindrical titanium casting with the opening comprises the following steps of: firstly, manufacturing a pouring mold according to the shape and the size of a cylindrical titanium casting, wherein the shape and the inner cavity of the pouring mold are matched with the cylindrical titanium casting, and the inner cavity space of the pouring mold corresponding to the opening edge of the cylindrical titanium casting is radially expanded to ensure that the opening edge of the cylindrical titanium casting molded by pouring is thickened by at least 2 mm; then connecting the casting mould and the casting furnace into a casting system, arranging a plurality of reinforcing ribs at the opening part of the casting mould, and arranging a reinforcing rib runner connected with the casting system in the reinforcing rib; and (3) casting and molding the casting mold, cooling, then 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.
2. The method for preparing a large cylindrical titanium casting with an opening according to claim 1, wherein the method comprises the following steps: the casting mold adopts a graphite mold or a graphite appearance and fired mold inner core mold.
3. The method for preparing a large cylindrical titanium casting with an 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-layer runners which are respectively positioned at different heights are arranged in the pouring mold.
4. The method for preparing a large cylindrical titanium casting with an 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 layer pouring gate surrounding the pouring mold is arranged outside the pouring mold.
5. The method for preparing a large cylindrical titanium casting with an 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 100-200 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN114713775A true CN114713775A (en) | 2022-07-08 |
| CN114713775B CN114713775B (en) | 2024-01-19 |
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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 |
-
2022
- 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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| CN114713775B (en) | 2024-01-19 |
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