CN113828734B - Gating system and investment casting process of high-temperature alloy four-way flange - Google Patents
Gating system and investment casting process of high-temperature alloy four-way flange Download PDFInfo
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- CN113828734B CN113828734B CN202111083458.4A CN202111083458A CN113828734B CN 113828734 B CN113828734 B CN 113828734B CN 202111083458 A CN202111083458 A CN 202111083458A CN 113828734 B CN113828734 B CN 113828734B
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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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Abstract
The invention discloses a gating system of a high-temperature alloy four-way flange and an investment casting process, belonging to the field of investment casting and being characterized in that a main horizontal pouring gate of the gating system is connected with an inner pouring gate; the ingates are arranged at four ports of the casting flange; wherein, an ingate arranged at the horizontal port of the casting flange is connected with a vertical runner; the cross section of the vertical pouring gate is set to be a curve shape, and a plurality of hot junctions are arranged on the vertical pouring gate at intervals; the upper end of the vertical pouring channel is connected with the upper end of the main horizontal pouring channel through an exhaust rib. The method has the advantages that when the molten steel is solidified and contracted, the molten steel has plastic or elastic deformation, and the contraction of the flange cannot be influenced, so that the technical problem of flange end face deformation is effectively solved; in the whole pouring process, the generated gas is discharged by the exhaust ribs, so that the quality of the casting is improved, and the problems of bubbles, shrinkage cavities and the like are reduced. The technological yield of the investment casting technology is improved from 45% to 55%, the product percent of pass is greatly improved, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of investment casting, in particular to a gating system of a high-temperature alloy four-way flange and an investment casting process.
Background
A high-temperature alloy four-way flange has no mature process in the investment casting industry, the traditional process adopts a multi-sprue, top pouring and side pouring, and two ingates are arranged at the bottom for reverse feeding, and a casting generates shrinkage stress and deforms in the cooling and solidifying process. Under normal conditions, the deformation of 1.5-2.0mm exists, and the subsequent correction is relatively complex; in addition, as the flange end is provided with a pouring channel, the operation is inconvenient during shell manufacturing, and the shell is not easy to dry, so that the strength of the shell is insufficient, and molten steel leaks during molten steel pouring; the pouring system is complex, the utilization rate of the molten steel is low, the thickness of the flange is larger than the thickness of the pipe wall, and the casting rod generates stress to deform the flange end face of the casting when contracting. Therefore, a new gating system and an investment casting process need to be designed.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a pouring system and an investment casting process of a high-temperature alloy four-way flange.
In order to achieve the purpose, the invention adopts the following technical scheme: a gating system of a high-temperature alloy four-way flange is characterized by comprising a pouring cup, wherein the pouring cup is provided with a main cross gate which is connected with an inner gate; the inner pouring channels are arranged at four ports of the casting flange; wherein, an ingate arranged at the horizontal port of the casting flange is connected with a vertical runner; the cross section of the vertical pouring gate is set to be a curved shape, and a plurality of hot joints are arranged on the vertical pouring gate at intervals; the upper end of the vertical pouring gate is connected with the upper end of the pouring cup through an exhaust rib.
Preferably: the pouring channels in the pouring cup are symmetrically arranged in a herringbone manner and are communicated with the main horizontal pouring channel; two sides of the main horizontal pouring gate are communicated with the upper end of the vertical pouring gate through a bridge; the gap bridges are symmetrically arranged to form an inverted splayed shape; the main horizontal pouring gate is arched, and a buffer bag is arranged at the bottom of the main horizontal pouring gate.
Preferably: the exhaust rib is set to be in a curve shape.
The invention also discloses an investment casting process of the high-temperature alloy four-way flange, which is characterized in that: the pouring system comprises the following operation steps: firstly, assembling and welding a wax module according to the shape of a required casting; step two, manufacturing a shell: coating a shell material on the surface of the wax die set, wherein a shell surface layer adopts zircon sand powder, a transition layer and a back layer adopt mullite sand powder, the sand of the transition layer is 30-60 meshes, and the sand of a reinforcing layer is 16-30 meshes; 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 1150-1175 ℃, and keeping the temperature for 45 min; step five, pouring: controlling the temperature of the shell at 800-; and sixthly, removing the shell to obtain the casting flange.
Preferably: and in the fifth step, the temperature of the shell is set to 950 ℃ during casting.
Compared with the prior art, the invention has the beneficial effects that: the vertical pouring channels on two sides of the inner pouring channel in the horizontal direction are set to be in a curved shape, particularly can be in a snake shape, and the vertical pouring channels are provided with a plurality of thermal junctions at intervals, so that molten steel has plastic or elastic deformation when being solidified and contracted, the contraction of the flange cannot be influenced, and the technical problem of flange end face deformation is effectively solved; through set up the exhaust muscle between vertical gate upper end and main horizontal gate upper end to set up the exhaust muscle into the curvilinear figure, specifically can set up to snakelike, make whole pouring in-process, produced gas all is discharged by the exhaust muscle, with the quality that improves the foundry goods, reduces bubble, shrinkage cavity scheduling problem. The investment casting process adopting the pouring system has the advantages that the vertical pouring gate in the pouring system is provided with the plurality of hot junctions, so that the large-diameter section and the small-diameter section of the vertical pouring gate are distributed at intervals, the operation and the drying of shell making are facilitated, the strength of a shell is enhanced, and the problem of shell leakage is solved. The technological yield of the investment casting technology is improved to 55% from 45%, the product percent of pass is greatly improved, and the production cost of the product is reduced.
Drawings
FIG. 1 is a schematic view of the pouring system and the casting structure of the present invention;
FIG. 2 is a left side view of FIG. 1 in accordance with the present invention;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1 in accordance with the present invention;
FIG. 4 is a cross-sectional view A-A of FIG. 2 according to the present invention;
in the figure: 1. a main runner; 1-1, buffer packet; 2. an inner pouring channel; 3. casting; 4. a vertical pouring channel; 4-1, thermal section; 5. bridging; 6. an exhaust rib; 7. pouring a cup; 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 four-way flange comprises a pouring cup, wherein a main cross gate 1 is arranged below the pouring cup, and the main cross gate 1 is connected with an inner gate 2; the ingates 2 are arranged at four ports of the casting flange; wherein the ingate 2 arranged at the horizontal port of the casting flange is connected with the vertical pouring gate 4; the cross section of the vertical pouring gate 4 is set to be in a curve shape, and can be specifically set to be in a snake shape, an S shape, a spiral shape, a wave shape, a fold line shape and the like; the flow passage of molten steel is prolonged, the flow speed of the molten steel is controlled, the heat preservation effect is better, the molding stability of a casting is improved, and a plurality of hot junctions 4-1 are arranged on the vertical pouring gate 4 at intervals; the diameter of the hot junction 4-1 is larger than that of the vertical pouring gate 4 body, so that the large-diameter section and the small-diameter section of the pouring gate are distributed at intervals, the operation and the drying of shell manufacturing are facilitated, the shell strength is enhanced, and the problem of shell leakage is solved. The arrangement of the hot spot ensures that the molten steel has plastic or elastic deformation when being solidified and contracted, and the contraction of the flange cannot be influenced, thereby effectively solving the technical problem of flange end face deformation; the upper end of the vertical pouring channel 4 is connected with the upper end of the main horizontal pouring channel 1 through an exhaust rib 6, and the exhaust rib 6 is in a curve shape, and can be in a snake shape, an S shape, a spiral shape, a wave shape, a fold line shape and the like; the gas generated in the whole pouring process is discharged by the exhaust ribs, so that the quality of the casting is improved, and the problems of bubbles, shrinkage cavities and the like are reduced.
Specifically, the pouring gate of the pouring cup 7 is arranged in a symmetrical herringbone shape and is communicated with the main horizontal pouring gate, so that molten steel uniformly flows into the main horizontal pouring gate; two sides of the main horizontal pouring gate 1 are communicated with the upper end of the vertical pouring gate 4 through a bridge 5; the gap bridges 5 are symmetrically arranged to form an inverted splayed shape; the bottom of the main horizontal pouring gate 1 is arched, so that the molten steel injection efficiency is improved, and the retention in the molten steel injection process is reduced; and the buffer bag 1-1 is arranged, so that the impact force of molten steel injection is reduced, the damage of the flushing force generated during molten steel injection to the ingate 2 is reduced, the molten steel leakage phenomenon generated by the ingate is effectively avoided, the molten steel utilization rate is improved, and the quality of castings is improved.
The invention discloses an investment casting process of a high-temperature alloy four-way flange, which adopts the casting system and comprises the following operation steps: step one, assembling and welding a wax module according to the shape of a required casting: as shown with reference to FIG. 2; step two, manufacturing a shell: coating a shell material on the surface of the wax die set, wherein a shell surface layer adopts zircon sand powder, a transition layer and a back layer adopt mullite sand powder, the sand of the transition layer is 30-60 meshes, and the sand of a reinforcing layer is 16-30 meshes; 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, wherein the roasting temperature is 1150-; step five, pouring: controlling the temperature of the shell at 800-; and sixthly, removing the shell to obtain the casting flange.
In specific implementation, the roasting temperature in the fourth step is set to 1150-; setting the shell temperature to 950 ℃ during casting in the fifth step, so that the molten steel has better fluidity and better formability; the technological yield of the investment casting technology is improved from 45% to 55%, the product percent of pass is greatly improved, and the production cost is reduced.
The casting principle is as follows: molten steel enters a main horizontal pouring gate 1 from a pouring gate of a pouring cup 7, flows to an inner pouring gate 2, enters a shell forming a casting flange 3, flows to the bottom of the shell, enters a serpentine belt hot junction vertical pouring gate 4 through the inner pouring gate 2 below, and then is converged with a bridge 5, so that gas generated in the whole pouring process is discharged by a serpentine technological rib 6; finally, the molten steel flows into the snakelike technological rib and simultaneously reaches the top of the pouring cup.
The pouring system and the casting process are not only suitable for the high-temperature alloy four-way flange, but also applicable to other castings such as high-neck flanges, three-way flanges and the like, and belong to the protection scope of the invention; 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 (5)
1. A pouring system of a high-temperature alloy four-way flange comprises a pouring cup (7), wherein a main horizontal pouring gate (1) is arranged below the pouring cup (7), and the main horizontal pouring gate (1) is connected with an inner pouring gate (2); two sides of the main horizontal pouring gate (1) are communicated with the upper end of the vertical pouring gate (4) through a bridge (5); the gap bridges (5) are symmetrically arranged to form an inverted splayed shape; the inner pouring channels (2) are arranged at four ports of the casting flange; wherein the ingate (2) arranged at the horizontal port of the casting flange is connected with the vertical pouring gate (4); the method is characterized in that: the section of the vertical pouring gate (4) is set to be a curve shape, and a plurality of hot junctions (4-1) are arranged on the vertical pouring gate (4) at intervals; the diameter of the hot joint (4-1) is larger than that of the vertical pouring channel (4), and the upper end of the vertical pouring channel (4) is connected with the upper end of the pouring cup (7) through an exhaust rib (6).
2. The gating system of a high-temperature alloy four-way flange according to claim 1, wherein: the pouring channels in the pouring cup (7) are arranged in a symmetrical herringbone manner and are communicated with the main horizontal pouring channel (1); the main horizontal pouring gate (1) is arched, and a buffer bag (1-1) is arranged at the bottom.
3. The gating system of a high-temperature alloy four-way flange according to claim 1, wherein: the exhaust rib (6) is in a curve shape.
4. The investment casting process of the high-temperature alloy four-way flange is characterized in that: the gating system of claim 1, comprising the following operational steps: firstly, assembling and welding a wax module according to the shape of a required casting; step two, manufacturing a shell: coating a shell material on the surface of the wax die set, wherein a shell surface layer adopts zircon sand powder, a transition layer and a back layer adopt mullite sand powder, the sand of the transition layer is 30-60 meshes, and the sand of a reinforcing layer is 16-30 meshes; 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 1150-1175 ℃, and keeping the temperature for 45 min; step five, pouring: controlling the shell temperature at 800-; and step six, removing the shell to obtain the casting flange.
5. The investment casting process of the high-temperature alloy four-way flange according to claim 4, wherein: and in the fifth step, the temperature of the shell is set to 950 ℃ during casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111083458.4A CN113828734B (en) | 2021-09-16 | 2021-09-16 | Gating system and investment casting process of high-temperature alloy four-way flange |
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| CN202111083458.4A CN113828734B (en) | 2021-09-16 | 2021-09-16 | Gating system and investment casting process of high-temperature alloy four-way flange |
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| CN113828734A CN113828734A (en) | 2021-12-24 |
| CN113828734B true CN113828734B (en) | 2022-09-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| IL55283A (en) * | 1977-08-29 | 1981-01-30 | Trw Inc | Mold assembly and method of making the same |
| CN204018644U (en) * | 2014-07-11 | 2014-12-17 | 合肥江淮铸造有限责任公司 | A kind of automotive hub running gate system |
| CN105312504B (en) * | 2015-11-04 | 2017-08-29 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of high temperature alloy thin-wall ring casting moulding system and manufacture method |
| CN109773122A (en) * | 2019-02-19 | 2019-05-21 | 大成（常熟）机械有限公司 | A kind of production technology and valve castings of the model casting of valve castings |
| CN110834067B (en) * | 2019-11-26 | 2021-01-15 | 中国航发沈阳黎明航空发动机有限责任公司 | High-temperature alloy porous seat casting pouring fired mold and fired mold manufacturing process method thereof |
| CN113263140B (en) * | 2020-09-04 | 2022-11-15 | 浙江泰能机械制造有限公司 | Bottom, middle cross pouring gate and valve pouring, middle way and middle way flange feeding system |
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