CN111097875A - Casting process of inner chill for accelerated solidification and cooling of thick and large investment castings - Google Patents
Casting process of inner chill for accelerated solidification and cooling of thick and large investment castings Download PDFInfo
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- CN111097875A CN111097875A CN201911173995.0A CN201911173995A CN111097875A CN 111097875 A CN111097875 A CN 111097875A CN 201911173995 A CN201911173995 A CN 201911173995A CN 111097875 A CN111097875 A CN 111097875A
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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
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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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
- B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
- B22D15/04—Machines or apparatus for chill casting
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Abstract
The invention discloses a casting process of inner chill for accelerating solidification and cooling of thick and large investment castings, which comprises the steps of synthesizing a casting wax mold and an inner chill positioning table wax mold into a module, manufacturing a shell, manufacturing a mold shell, positioning the inner chill, casting and carrying out subsequent cleaning operation to finish casting. The casting process of the invention, in which the internal chill is used for the accelerated solidification and cooling of thick and large investment castings, realizes the effective placement of the internal chill in investment casting; the method not only can reduce the thermal junctions of the thick and large parts, but also can effectively avoid the defects of shrinkage, looseness, large internal structure grains and the like, and effectively improve the product quality and the process yield of the thick and large investment castings.
Description
Technical Field
The invention belongs to the technical field of investment casting, and relates to a casting process for accelerated solidification and cooling of a thick and large investment casting by using internal chill.
Background
After the mold making and the shell making are completed, molten metal is poured into a mold shell roasted at a high temperature, so that a chill is difficult to place, the feeding amount required by a large hot spot is large, a large riser needs to be designed to feed the casting, the solidification time is long, the cooling speed is low, grains of an internal structure at the position are large, the grains are difficult to refine through heat treatment, internal defects such as shrinkage porosity, shrinkage cavity and the like easily occur, and the process yield of the casting is greatly reduced.
Chinese patent "investment casting process for accelerating solidification and cooling of casting" (application number:
201510690405.7, filing date: 2015.10.22, publication No.: CN105364002A, published: 2016.03.02) discloses that, by inserting battens into the inner cavity of the mould shell during the manufacturing process of the mould shell and using iron bars to replace the burnt battens to be inserted into the cavity of the mould shell after the mould shell is roasted, the heat in the pipeline or the inner cavity can be quickly discharged by utilizing the good heat conductivity of the iron bars after casting, the solidification and cooling speed of the casting is accelerated, and the defects of shrinkage cavity and looseness of the casting are avoided. In the method, the iron bars in the hollow cavity of the formwork do not contact with molten metal, the effect is similar to that of the external chilling block, but the solidification cooling effect is poorer than that of the external chilling block.
Disclosure of Invention
The invention aims to provide a casting process for accelerated solidification and cooling of a thick and large investment casting by using internal chill, which can effectively reduce the thermal junctions of the thick and large part of the casting and can prevent casting defects such as shrinkage porosity and shrinkage cavity.
The technical scheme adopted by the invention is that the casting process of the inner chill for the accelerated solidification and cooling of the thick and large investment casting is implemented according to the following steps:
step 1, manufacturing a wax mold of a thick and large investment casting according to a normal process, meanwhile, manufacturing a positioning table wax mold of internal chill at the thick and large part of the wax mold, and combining the wax mold and the positioning table wax mold into a module;
step 2, coating materials on the wax mould according to a normal process to prepare a shell, and finishing shell preparation;
step 3, dewaxing and roasting according to a normal process after shell manufacturing to form a mould shell;
step 4, adding the internal chill into a cavity reserved in the die shell for an internal chill positioning table, and positioning;
and 5, finishing casting and subsequent cleaning operation according to a normal process.
The present invention is also characterized in that,
the integral size of the positioning table wax mold of the internal chill is 0.5-1 mm larger than the size of a cavity reserved in the mold shell.
The material of the internal chill is the same as that of the casting.
The shape of the positioning table wax mould of the internal chill is matched with that of the internal chill main body, and the surface of the internal chill is smooth.
And step 4, specifically, adding the internal chill into a cavity reserved in the die shell and reserving the internal chill positioning table, and rotating the internal chill by 90 degrees for positioning.
The invention has the beneficial effects that:
the casting process of the invention, in which the internal chill is used for the accelerated solidification and cooling of thick and large investment castings, realizes the effective placement of the internal chill in investment casting; the method not only can reduce the thermal junctions of the thick and large parts, but also can effectively avoid the defects of shrinkage, looseness, large internal structure grains and the like, and effectively improve the product quality and the process yield of the thick and large investment castings.
Drawings
FIG. 1 is a schematic structural view of a large turbine according to embodiment 1 of the present invention;
FIG. 2 is a schematic view of a large turbine according to another angle in the embodiment 1 of the present invention;
FIG. 3 is a schematic structural view of an inner chill positioning table in embodiment 1 of the present invention;
FIG. 4 is a schematic view showing another angle of the inner chill positioning table in embodiment 1 of the present invention;
FIG. 5 is a schematic structural diagram of a module in embodiment 1 of the present invention;
FIG. 6 is a sectional view of a module in example 1 of the present invention;
FIG. 7 is a schematic view showing the structure of a formwork in embodiment 1 of the present invention;
FIG. 8 is a sectional view of a formwork of example 1 of the present invention;
FIG. 9 is a schematic structural view of an internal chill according to embodiment 1 of the present invention;
FIG. 10 is a schematic view showing another angle structure of the inner chill according to embodiment 1 of the present invention;
FIG. 11 is a schematic structural view of an inner chill rotating 90 degrees and being placed in a formwork to position a platform in embodiment 1 of the present invention;
FIG. 12 is a cross-sectional view of an inner chill rotated 90 degrees to a position within a mold casing in accordance with embodiment 1 of the present invention.
In the figure, 1, a bench wax mold is positioned.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a casting process of accelerated solidification and cooling of an inner chill for a thick and large investment casting, which is implemented according to the following steps:
step 1, manufacturing a wax pattern of a thick large-scale investment casting according to a normal process, meanwhile, manufacturing a positioning table wax pattern of internal chill at the position of the large-scale thickness part of the wax pattern, matching the shape of the positioning table wax pattern of the internal chill with the shape of the main body of the internal chill, enabling the overall size of the positioning table wax pattern of the internal chill to be 0.5-1 mm larger than the size of a cavity reserved in a mould shell for positioning a table of the internal chill, and combining the wax pattern and the positioning table wax pattern into a module;
step 2, coating materials on the wax mould according to a normal process to prepare a shell, and finishing shell preparation;
step 3, dewaxing and roasting according to a normal process after shell manufacturing to form a mould shell;
step 4, adding the internal chill which is the same as the casting material and has a smooth surface into a cavity of a reserved internal chill positioning table in the mould shell, and rotating the internal chill by 90 degrees for positioning;
and 5, finishing casting and subsequent cleaning operation according to a normal process.
According to the mode, the casting process of the inner chill for the accelerated solidification and cooling of the thick and large investment castings, disclosed by the invention, has the advantages that for the thick and large investment castings, the inner chill made of the same material is placed into the positioning mould shell before the molten metal is poured, the inner chill is positioned after rotating for 90 degrees, then the pouring is finished, and the inner chill made of the same material can accelerate the solidification and cooling of the thick and large parts of the castings. The method not only can reduce the thermal junctions of the thick and large parts, but also can effectively avoid the defects of shrinkage, looseness, coarse internal structure grains and the like, and effectively improve the product quality and the process yield of the thick and large investment castings.
Example 1
The embodiment provides a casting process of an inner chill for accelerating solidification and cooling of a thick large investment casting, which is used for casting a large turbine, as shown in fig. 1-2, the turbine has a diameter of phi 438 x 327mm, 8 uniformly distributed blades, a blank weight of 107Kg and a material of stainless steel, and the casting process is implemented according to the following steps:
step 1, manufacturing a wax mould of the large turbine according to a normal process, and meanwhile, additionally manufacturing a positioning table wax mould 1 of an internal chill at the bottom of the wax mould, as shown in figures 3-4, wherein the positioning table wax mould 1 of the internal chill is matched with the main body shape of the internal chill, the integral size of the positioning table wax mould 1 of the internal chill is 1mm larger than the size of a cavity reserved with an internal chill positioning table in a mould shell, and combining the wax mould and the positioning table wax mould 1 into a module shown in figures 5-6;
step 2, coating materials on the wax mould according to a normal process to prepare a shell, and finishing shell preparation;
step 3, dewaxing and roasting according to a normal process after shell manufacturing to form a formwork shown in figures 7-8;
step 4, adding the internal chill which is the same as the casting material and has a smooth surface into a cavity of a reserved internal chill positioning table in the mould shell as shown in figures 9-10, and rotating the internal chill by 90 degrees for positioning as shown in figures 11-12;
and 5, finishing casting and subsequent cleaning operation according to a normal process.
In the example, in the casting process of the turbine, the inner chill enables the thick and large position at the lower end of the turbine to be rapidly cooled, the cooling effect is good, and finally the qualified turbine casting is obtained.
Example 2
The embodiment provides a casting process for accelerated solidification and cooling of a thick and large investment casting by using internal chill, which is implemented according to the following steps:
step 1, manufacturing a wax pattern of a thick large-scale investment casting according to a normal process, meanwhile, manufacturing a positioning table wax pattern of internal chill at the position of the thick large part of the wax pattern, matching the shape of the positioning table wax pattern of the internal chill with the shape of the main body of the internal chill, enabling the overall size of the positioning table wax pattern of the internal chill to be 0.5mm larger than the size of a cavity reserved in a mould shell for positioning a table of the internal chill, and combining the wax pattern and the positioning table wax pattern into a module;
step 2, coating materials on the wax mould according to a normal process to prepare a shell, and finishing shell preparation;
step 3, dewaxing and roasting according to a normal process after shell manufacturing to form a mould shell;
step 4, adding the internal chill which is the same as the casting material and has a smooth surface into a cavity of a reserved internal chill positioning table in the mould shell, and rotating the internal chill by 90 degrees for positioning;
and 5, finishing casting and subsequent cleaning operation according to a normal process.
Example 3
The embodiment provides a casting process for accelerated solidification and cooling of a thick and large investment casting by using internal chill, which is implemented according to the following steps:
step 1, manufacturing a wax pattern of a thick large-scale investment casting according to a normal process, meanwhile, additionally manufacturing a positioning table wax pattern of internal chill at the position of the thick large part of the wax pattern, wherein the positioning table wax pattern of the internal chill is matched with the shape of the main body of the internal chill, the overall size of the positioning table wax pattern of the internal chill is 0.8mm larger than the size of a cavity reserved in a mould shell of the positioning table of the internal chill, and combining the wax pattern and the positioning table wax pattern into a module;
step 2, coating materials on the wax mould according to a normal process to prepare a shell, and finishing shell preparation;
step 3, dewaxing and roasting according to a normal process after shell manufacturing to form a mould shell;
step 4, adding the internal chill which is the same as the casting material and has a smooth surface into a cavity of a reserved internal chill positioning table in the mould shell, and rotating the internal chill by 90 degrees for positioning;
and 5, finishing casting and subsequent cleaning operation according to a normal process.
Claims (5)
1. A casting process of inner chill for accelerating solidification and cooling of thick and large investment castings is characterized by comprising the following steps:
step 1, manufacturing a wax mold of a thick and large investment casting according to a normal process, meanwhile, manufacturing a positioning table wax mold of internal chill at the thick and large part of the wax mold, and combining the wax mold and the positioning table wax mold into a module;
step 2, coating materials on the wax mould according to a normal process to prepare a shell, and finishing shell preparation;
step 3, dewaxing and roasting according to a normal process after shell manufacturing to form a mould shell;
step 4, adding the internal chill into a cavity reserved in the die shell for an internal chill positioning table, and positioning;
and 5, finishing casting and subsequent cleaning operation according to a normal process.
2. The casting process of the inner chill for the accelerated solidification and cooling of the thick and large investment casting according to claim 1, wherein the overall size of the positioning table wax mold of the inner chill is 0.5-1 mm larger than the size of the cavity reserved in the mold shell.
3. The casting process of the internal chill of claim 1, wherein the internal chill is made of the same material as the casting.
4. The casting process of the internal chill of claim 1, wherein the positioning stage wax pattern of the internal chill matches the shape of the main body of the internal chill, and the surface of the internal chill is smooth.
5. The casting process of the inner chill for the accelerated solidification and cooling of the thick and large investment casting according to claim 1, wherein the step 4 is to add the inner chill into a cavity reserved in a mold shell and rotate the inner chill by 90 degrees for positioning.
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| CN201911173995.0A CN111097875B (en) | 2019-11-26 | 2019-11-26 | Casting process of inner chill for accelerated solidification and cooling of thick and large investment castings |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111957891A (en) * | 2020-08-13 | 2020-11-20 | 山东泰山钢铁集团有限公司 | Manufacturing method of investment casting bidirectional pump impeller |
| CN112170787A (en) * | 2020-09-29 | 2021-01-05 | 天海高(北京)新材料科技有限公司 | Tissue control method for improving strength of titanium-aluminum alloy turbine core |
| CN114713800A (en) * | 2022-03-21 | 2022-07-08 | 陕西飞机工业有限责任公司 | Solid metal feeding method for thick and large casting |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111957891A (en) * | 2020-08-13 | 2020-11-20 | 山东泰山钢铁集团有限公司 | Manufacturing method of investment casting bidirectional pump impeller |
| CN112170787A (en) * | 2020-09-29 | 2021-01-05 | 天海高(北京)新材料科技有限公司 | Tissue control method for improving strength of titanium-aluminum alloy turbine core |
| CN114713800A (en) * | 2022-03-21 | 2022-07-08 | 陕西飞机工业有限责任公司 | Solid metal feeding method for thick and large casting |
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| CN111097875B (en) | 2021-11-12 |
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