CN113828735A - Gating system and investment casting process of high-temperature alloy elbow - Google Patents
Gating system and investment casting process of high-temperature alloy elbow Download PDFInfo
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- CN113828735A CN113828735A CN202111095766.9A CN202111095766A CN113828735A CN 113828735 A CN113828735 A CN 113828735A CN 202111095766 A CN202111095766 A CN 202111095766A CN 113828735 A CN113828735 A CN 113828735A
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- pouring
- shell
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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
- B22C9/02—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
- 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
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention relates to a pouring system of a high-temperature alloy elbow and an investment casting process, belonging to the field of investment casting, and being characterized in that the pouring system of the high-temperature alloy elbow comprises a side pouring cup and a riser cup connected with the side pouring cup; a buffer bag is arranged on one side of the bottom of the side pouring cup; the side pouring cup and the riser cup are internally provided with a sinuous pouring gate, the top end of the riser cup is provided with a riser cover plate, and one side of the riser cup is provided with an exhaust rib. The investment casting process of the high-temperature alloy elbow comprises the steps of assembling and welding a wax module, manufacturing a shell, performing steam dewaxing, roasting the shell and casting; the method has the advantages that the method realizes the unilateral injection of the molten steel and the directional and constant-flow injection of the molten steel during the casting; the buffer effect is achieved for the injection of the molten steel; the exhaust is convenient to carry out in the molten steel injection process; effectively solves the problems of poor surface quality, poor air tightness, shrinkage porosity of the pipe orifice part and the like of the casting caused by the flushing of molten steel. The product percent of pass is greatly improved, thereby greatly reducing the production cost.
Description
Technical Field
The invention relates to the technical field of investment casting, in particular to a gating system of a high-temperature alloy elbow and an investment casting process.
Background
Since the high-temperature alloy elbow belongs to high-temperature alloy and is large in wall thickness, the casting problem exists since 2018 production: poor surface quality and air tightness, and casting defects such as slag inclusion, sand inclusion, shrinkage porosity and the like at the groove part after the pipe orifice is processed; most of the welding materials need repair welding to meet the requirements, and the process yield and the qualified rate are low, so the production cost is high. The poor surface quality of the cast produced by the prior art is caused by that molten steel is directly rushed from the top end (namely the middle part) of the elbow during pouring, particularly the inner top end of the elbow is overheated due to continuous scouring of the molten steel, so that the inner surface and the outer surface of the cast are rough; in the casting process in the prior art, no vent hole exists, and the molten steel cannot be exhausted after being directly flushed down, so that the gas is sealed in the cavity, and the defects of air holes, slag holes and the like are caused. Therefore, a further breakthrough is needed in the pouring process of the elbow fitting with large wall thickness, so that the poured product can be greatly overflowed.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a pouring system and an investment casting process for a high-temperature alloy elbow.
In order to achieve the purpose, the invention adopts the following technical scheme: a pouring system of a high-temperature alloy elbow is characterized by comprising a side pouring cup and a riser cup connected with the side pouring cup; a buffer bag is arranged on one side of the bottom of the side pouring cup; the side pouring cup and the riser cup are internally provided with a sinuous pouring gate, the top end of the riser cup is provided with a riser cover plate, and one side of the riser cup is provided with an exhaust rib.
Preferably: the cross section of the pouring channel is circular, and the pipe diameters of the pouring channel are the same.
Preferably: an included angle is formed between the buffer ladle and a pouring gate outlet of the side pouring cup, and the included angle is 60-90 degrees.
The invention also discloses a investment casting process of the high-temperature alloy elbow, which adopts the casting system; the method comprises the following operation steps: step one, assembling and welding a wax module: manufacturing a wax mould according to the shape of a required casting; step two, manufacturing a shell: coating a shell material on the surface of the wax mould, wherein the surface layer of the shell adopts zircon sand powder, and the transition layer and the back layer adopt mullite sand powder; step three, steam dewaxing: dewaxing the wax mould coated with the shell material, wherein the dewaxing temperature is set to be 120 ℃, and the dewaxing time is set to be 30 min; step four, roasting the shell: placing the dewaxed shell into a roasting furnace, roasting at the temperature of 1120-1150 ℃, and keeping the temperature for 45 min; step five, pouring: the temperature of the shell is set to be 650 plus 800 ℃ during pouring, molten steel enters a pouring channel from a side pouring cup, flows to a buffer ladle along the pouring channel and then flows to the inside of the shell, the molten steel flows to the bottom of the inside of the shell from one side of the shell, one side of the shell overflows and then flows to the other side of the shell, and the molten steel rises to the top end of the inside of the shell from the bottom of the other side of the shell; when the molten steel flows to the riser cup and can be seen from the riser cup, slowly pouring until the molten steel is fully poured, and covering a riser cover plate; and sixthly, removing the shell to obtain a casting.
Preferably: the temperature of the shell is set to be 780 ℃ during pouring.
Preferably: the riser cover plate is made of covering agent and heat insulation cotton.
Compared with the prior art, the invention has the beneficial effects that: the pouring system is set to be a combination of the side pouring cup and the riser cup, so that the single-side injection of the molten steel is realized during pouring, and the directional and constant-flow injection of the molten steel is realized by the flow direction setting and the pouring gate caliber setting of the pouring gates in the side pouring cup and the riser cup; an included angle is formed between the buffer ladle and a pouring gate outlet of the side pouring cup, so that the buffer effect on molten steel injection is achieved; the riser cup is provided with an exhaust rib, so that exhaust is conveniently carried out in the molten steel injection process; effectively solves the problems of poor surface quality, poor air tightness, shrinkage porosity of the pipe orifice part and the like of the casting caused by the flushing of molten steel. The technological yield of the investment casting process of the high-temperature alloy elbow adopting the gating system is improved to 65 percent from the original 51 percent, and the qualification rate of the produced casting product is also greatly improved, thereby greatly reducing the production cost.
Drawings
FIG. 1 is a schematic view of the pouring system and the casting structure of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1 in accordance with the present invention;
in the figure: 1. laterally pouring a cup; 2. a pouring channel; 3. buffering the packet; 4. casting; 6. An exhaust rib; 7. a riser cup; 8. riser apron.
The arrow direction is the molten steel flow direction.
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 only a part of the embodiments of the present invention, and not all of the embodiments.
Example one
Referring to the attached figure 1, the pouring system of the high-temperature alloy elbow comprises a side pouring cup 1 and a riser cup 7 connected with the side pouring cup 1; a buffer bag 3 is arranged on one side of the bottom of the side pouring cup 1; an included angle is formed between the buffer ladle 3 and a pouring gate outlet of the side pouring cup 1, and the included angle is 60-90 degrees; the molten steel has good buffering effect when being injected downwards, the scouring force is reduced, and the surface quality of the casting is improved; the side pouring cup 1 and the riser cup 7 are internally provided with a winding pouring gate 2, the cross section of the pouring gate 2 is circular, the pipe diameters of the pouring gate 2 are the same, the pouring gate 2 can be in a continuous S shape, a spiral shape and the like, and the functions of reducing the flow velocity of molten steel and reducing scouring force are also achieved; the aperture of the pouring gate 2 is 30mm, so that the flow limiting effect is achieved; the arrow direction is the flow direction of the molten steel, and plays a role in orientation; the top end of the riser cup 7 is provided with a riser cover plate 8, one side of the riser cup 7 is provided with an exhaust rib 6, molten steel flows from one side to the other side in the injection process, slowly rises to the top end, and then is converged with a pouring channel of the riser cup, so that exhaust is facilitated, and residues float upwards conveniently.
The investment casting process of the high-temperature alloy elbow is characterized in that: adopting the pouring system; the method comprises the following operation steps: step one, assembling and welding a wax module: manufacturing a wax mould according to the shape of a required casting; step two, manufacturing a shell: coating a shell material on the surface of the wax mould, wherein the surface layer of the shell adopts zircon sand powder, and the transition layer and the back layer adopt mullite sand powder; step three, steam dewaxing: dewaxing the wax mould coated with the shell material, wherein the dewaxing temperature is set to be 120 ℃, and the dewaxing time is set to be 30 min; step four, roasting the shell: placing the dewaxed shell into a roasting furnace, roasting at the temperature of 1120-1150 ℃, and keeping the temperature for 45 min; step five, pouring: the temperature of the shell is set to be 650 plus 800 ℃ during pouring, molten steel enters a pouring channel from a side pouring cup 1, flows to a buffer ladle along the pouring channel 2 and then flows to the inside of the shell, the molten steel flows to the bottom of the inside of the shell from one side of the shell, one side of the shell overflows and then flows to the other side of the shell, and the molten steel rises to the top end of the inside of the shell from the bottom of the other side of the shell; when the molten steel flows to the riser cup 7 and can be seen from the riser cup 7, slowly pouring until the molten steel is fully poured, and covering a riser cover plate 8 which adopts a covering agent and heat-insulating cotton; and sixthly, removing the shell to obtain a casting.
The technological yield of the investment casting process of the high-temperature alloy elbow adopting the gating system is improved to 65 percent from the original 51 percent, and the qualification rate of the produced casting product is also greatly improved, thereby greatly reducing the production cost.
The roasting temperature is set to 1120-1150 ℃, so that the strength of the shell is higher and the stability is better; when the shell temperature is set to 780 ℃ during pouring, the molten steel has better fluidity and better formability during pouring; molten steel enters a pouring channel from a side pouring cup 1, flows to a buffer ladle along the pouring channel 2 and then flows to the inside of the shell, the molten steel flows to the bottom of the inside of the shell from one side of the shell, overflows from one side of the shell and then flows to the other side of the shell, and rises to the top end of the inside of the shell from the bottom of the other side of the shell; the two sides are full, namely molten steel rises to the top end in the shell; when the molten steel flows to the riser cup 7 and can be seen from the riser cup 7, slowly pouring until the molten steel is fully poured, and covering a riser cover plate 8; the qualification rate of the produced casting product reaches 65 percent, and the qualification rate of the product is greatly improved, thereby greatly reducing the production cost.
The casting principle is as follows: the top end of the shell is provided with a special buffer type directional flow pouring system riser cup 7, molten steel is poured down from a side pouring cup 1, the molten steel is poured along a pouring gate 2, flows to a buffer bag 3, slowly flows to the interior of the shell forming a casting body 4, firstly flows to the bottom of the shell forming the casting body from one side, and then flows to the other side of the bottom of the shell from one side of the bottom; then the mould shell rises to the top end of the mould shell; so that the gas in the formed casting body can be discharged by the process ribs 6, and the generation of the gas is avoided. When the molten steel flows to the riser cup 7 and can be seen from the riser cup 7, the molten steel is slowly poured until the molten steel is fully poured, and a riser covering agent and heat insulation cotton are covered, namely a riser cover plate 8 is covered.
The pouring system and the casting process are not only suitable for the high-temperature alloy elbow, but also belong to the protection scope of the invention when being used for other elbow parts; the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (6)
1. A gating system of high temperature alloy elbow which characterized in that: comprises a side pouring cup (1) and a riser cup (7) connected with the side pouring cup (1); a buffer bag (3) is arranged on one side of the bottom of the side pouring cup (1); the side pouring cup (1) and the riser cup (7) are internally provided with a winding pouring gate (2), the top end of the riser cup (7) is provided with a riser cover plate (8), and one side of the riser cup (7) is provided with an exhaust rib (6).
2. The gating system of claim 1, wherein the gating system comprises: the cross section of the pouring gate (2) is circular, and the pipe diameters of the pouring gate (2) are the same.
3. The gating system of claim 1, wherein the gating system comprises: an included angle is formed between the buffer ladle (3) and a pouring gate outlet of the side pouring cup (1), and the included angle is 60-90 degrees.
4. The investment casting process of the high-temperature alloy elbow is characterized in that: adopting the pouring system; the method comprises the following operation steps: step one, assembling and welding a wax module: manufacturing a wax mould according to the shape of a required casting; step two, manufacturing a shell: coating a shell material on the surface of the wax mould, wherein the surface layer of the shell adopts zircon sand powder, and the transition layer and the back layer adopt mullite sand powder; step three, steam dewaxing: dewaxing the wax mould coated with the shell material, wherein the dewaxing temperature is set to be 120 ℃, and the dewaxing time is set to be 30 min; step four, roasting the shell: placing the dewaxed shell into a roasting furnace, roasting at the temperature of 1120-1150 ℃, and keeping the temperature for 45 min; step five, pouring: the temperature of the shell is set to be 650 plus 800 ℃ during pouring, molten steel enters a pouring channel from a side pouring cup (1), flows to a buffer ladle along the pouring channel (2) and then flows to the inside of the shell, the molten steel flows to the bottom of the inside of the shell from one side of the shell, one side of the shell overflows and then flows to the other side of the shell, and the molten steel rises to the top end of the inside of the shell from the bottom of the other side of the shell; when the molten steel flows to the riser cup (7) and can be seen from the riser cup (7), slowly pouring until the molten steel is fully poured, and covering a riser cover plate (8); and sixthly, removing the shell to obtain a casting.
5. The investment casting process of a high temperature alloy elbow according to claim 4, wherein: the temperature of the shell is set to be 780 ℃ during pouring.
6. The investment casting process of a high temperature alloy elbow according to claim 4, wherein: the riser cover plate is made of covering agent and heat insulation cotton.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111095766.9A CN113828735B (en) | 2021-09-18 | 2021-09-18 | Pouring system and investment casting process of high-temperature alloy elbow |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111095766.9A CN113828735B (en) | 2021-09-18 | 2021-09-18 | Pouring system and investment casting process of high-temperature alloy elbow |
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| CN113828735A true CN113828735A (en) | 2021-12-24 |
| CN113828735B CN113828735B (en) | 2023-06-16 |
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| CN202111095766.9A Active CN113828735B (en) | 2021-09-18 | 2021-09-18 | Pouring system and investment casting process of high-temperature alloy elbow |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114749601A (en) * | 2022-05-07 | 2022-07-15 | 东风(十堰)有色铸件有限公司 | Multifunctional sprue cup and processing method thereof |
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| CN203281812U (en) * | 2013-06-21 | 2013-11-13 | 山东联诚集团有限公司 | S-shaped pouring device |
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| CN107671243A (en) * | 2017-11-13 | 2018-02-09 | 安徽应流铸业有限公司 | A kind of abnormity buffering ash melting type running channel |
| CN110090927A (en) * | 2019-06-12 | 2019-08-06 | 鹰普航空零部件（无锡）有限公司 | A method of solving aviation stainless steel investment-casting stress cracking |
| CN209223128U (en) * | 2018-10-13 | 2019-08-09 | 内蒙古锦联铝材有限公司 | A kind of aluminium alloy sand mould casting equipment |
| CN113333677A (en) * | 2021-06-09 | 2021-09-03 | 西安工业大学 | Precise casting process of thin-wall complex casting for high-horsepower engine |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86209311U (en) * | 1986-11-15 | 1987-11-18 | 山东滨州活塞厂 | Aluminum alloy piston casting die with small feeder head |
| CN203426376U (en) * | 2013-05-13 | 2014-02-12 | 上海嘉朗实业有限公司 | Metal type gravity tilting pouring die for aluminum alloy bend pipe |
| CN103302248A (en) * | 2013-05-20 | 2013-09-18 | 江苏久保联实业有限公司 | Investment casting mould of high-temperature alloy bending pipe |
| CN203281812U (en) * | 2013-06-21 | 2013-11-13 | 山东联诚集团有限公司 | S-shaped pouring device |
| CN204413058U (en) * | 2014-12-31 | 2015-06-24 | 鹰普航空零部件（无锡）有限公司 | Snakelike trident sprue structure |
| CN106513582A (en) * | 2016-12-31 | 2017-03-22 | 马鞍山市海天重工科技发展有限公司 | Gating system for semi-curved pipe |
| CN107671243A (en) * | 2017-11-13 | 2018-02-09 | 安徽应流铸业有限公司 | A kind of abnormity buffering ash melting type running channel |
| CN209223128U (en) * | 2018-10-13 | 2019-08-09 | 内蒙古锦联铝材有限公司 | A kind of aluminium alloy sand mould casting equipment |
| CN110090927A (en) * | 2019-06-12 | 2019-08-06 | 鹰普航空零部件（无锡）有限公司 | A method of solving aviation stainless steel investment-casting stress cracking |
| CN113333677A (en) * | 2021-06-09 | 2021-09-03 | 西安工业大学 | Precise casting process of thin-wall complex casting for high-horsepower engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114749601A (en) * | 2022-05-07 | 2022-07-15 | 东风(十堰)有色铸件有限公司 | Multifunctional sprue cup and processing method thereof |
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| Publication number | Publication date |
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| CN113828735B (en) | 2023-06-16 |
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