CN113828729A - High-temperature alloy supporting tube investment casting mold and pouring process thereof - Google Patents
High-temperature alloy supporting tube investment casting mold and pouring process thereof Download PDFInfo
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- CN113828729A CN113828729A CN202111083421.1A CN202111083421A CN113828729A CN 113828729 A CN113828729 A CN 113828729A CN 202111083421 A CN202111083421 A CN 202111083421A CN 113828729 A CN113828729 A CN 113828729A
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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
- 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
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
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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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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a high-temperature alloy supporting tube investment casting mould which is characterized in that a casting mould and a supporting tube mould are integrally formed; the casting mould comprises an arched cross pouring gate, and an inner pouring gate is connected below the cross pouring gate; the supporting pipe die is arranged below the casting die and is vertical to the ingate; the insert is arranged at one end of the supporting pipe die; and the other end of the supporting pipe die is provided with a die core. The supporting tube investment casting die has the advantages that the supporting tube common mode with two lengths is realized, the utilization rate of the supporting tube investment casting die is improved, the production efficiency of the supporting tube is improved, the manufacturing procedure is simplified, and the manufacturing cost is reduced. The casting process of the high-temperature alloy support pipe is also disclosed, and is characterized in that the support pipe investment casting mold is adopted for molding, and wax is injected to form a wax mold set at one step; then, making a shell, performing steam dewaxing, roasting the shell, and casting; the method has the advantages of reducing the weight of the supporting tube blank, improving the process yield, improving the product percent of pass of the supporting tube and greatly improving the production efficiency.
Description
Technical Field
The invention relates to the technical field of high-temperature alloy supporting tubes, in particular to an investment casting mold for a high-temperature alloy supporting tube and a casting process of the investment casting mold.
Background
Aiming at the supporting tubes with the same tube diameter and the lengths of 300mm and 350mm, the wall thickness of the supporting tube is 6mm, the supporting tube belongs to a high-temperature alloy tube, the long wall of the supporting tube is thin, the casting problem exists from the production, and two supporting tube molds need to be manufactured respectively and matched with two casting molds; the manufacture wastes time and labor, and the production efficiency is lower. The cast support tube has poor surface quality and poor air tightness, and the groove part has casting defects of slag inclusion, sand inclusion, shrinkage porosity and the like after the tube orifice is processed; most of the materials can meet the requirements only by repair welding, and the process yield is low, about 30 percent; the poor surface quality is caused by that the top of the steel water pipe is directly flushed during pouring, and the molten steel is continuously flushed to cause overheating, so that the inner surface and the outer surface of the casting are rough; the original pouring process has no vent hole, and the molten steel cannot be exhausted after being directly flushed down, so that the gas is blocked in the cavity, and the defects of air holes, slag holes and the like are generated; it is therefore desirable to design a new casting mold and to improve the process of casting the support tube.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a high-temperature alloy supporting tube investment casting die and a casting process thereof.
In order to achieve the purpose, the invention adopts the following technical scheme: a high-temperature alloy supporting tube investment casting mould is characterized by comprising a mould body, wherein the mould body comprises a casting mould, a supporting tube mould and an insert; the pouring mould comprises an arched cross pouring gate, an inner pouring gate is connected below the cross pouring gate, a pouring cup is arranged above the cross pouring gate, and a die head loose core is arranged in the middle of the pouring cup in a matched manner; an exhaust rib is arranged between the cross gate and the pouring cup; the supporting pipe die is arranged below the casting die and is vertical to the ingate; the insert is arranged at one end of the supporting pipe die; and the other end of the supporting pipe die is provided with a die loose core.
Preferably: the pouring mould and the supporting pipe mould are of an integrated structure.
Preferably: the insert is a movable insert, and the insert is made of 7071 aluminum alloy.
Preferably: and a buffer bag is arranged at the bottom of the transverse pouring gate.
The invention also discloses a casting process of the high-temperature alloy supporting tube, which is characterized by comprising the following operation steps of: firstly, performing mould making by adopting the supporting tube investment casting mould, and performing wax injection once forming to obtain a wax mould set; step two, manufacturing a shell: coating a shell material on the surface of the wax mould group, wherein zircon sand powder is adopted as a surface layer, and mullite sand powder is adopted as a transition layer and a back layer; 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 25 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: controlling the temperature of the shell at 650-800 ℃ during pouring; and sixthly, removing the shell to obtain the casting support tube.
Preferably: in the first step, when the wax mould is manufactured, the insert is inlaid in the support pipe mould, and the length of the obtained support pipe mould is 300 mm; and taking out the insert to obtain the supporting pipe die with the length of 350 mm.
Preferably: in the fifth step, the temperature of the mold shell is set to 780 ℃ during casting.
Compared with the prior art, the invention has the beneficial effects that: the casting die and the supporting pipe die are set to be an integrated structure, so that wax injection is formed into a wax die set at one time; the insert is placed in or taken out of the support tube die, so that the support tube common mode with two lengths is realized, the utilization rate of the support tube investment casting die is improved, the production efficiency of the support tube is improved, the manufacturing procedure is simplified, and the manufacturing cost is reduced. When the supporting tube is poured, the cross gate is arched, so that molten steel is uniformly poured from two sides to form a casting during pouring, and meanwhile, the bottom of the cross gate is provided with the buffer bag, so that the molten steel is effectively prevented from being overheated due to direct impact from the top of the pipe fitting, and the quality of the inner surface and the outer surface of the casting is improved; the exhaust rib is arranged between the cross gate and the pouring cup for exhausting, so that the defects of air holes, slag holes and the like of the casting are effectively avoided; the supporting tube produced by the casting process reduces the weight of a blank, improves the process yield, improves the product percent of pass of the supporting tube, and greatly improves the production efficiency.
Drawings
FIG. 1 is a schematic structural view of a high temperature alloy support tube investment casting mold according to 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 A-A of FIG. 2 in accordance with the present invention;
in the figure: 1. core pulling of a die head; 2. an exhaust rib; 3. a cross gate; 4. an inner pouring channel; 5. core pulling of the mold; 6. supporting a pipe die; 7. pouring a mold; 8, a die body; 9. an insert; 10. pouring a cup; 11. and buffering the packet.
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
The high-temperature alloy supporting tube investment casting mold comprises a mold body 8, wherein the mold body 8 comprises a casting mold 7, a supporting tube mold 6 and an insert 9; the casting mould 7 and the supporting pipe mould 6 are arranged into an integrated structure; the manufacturing process of the supporting tube is simplified, and the working efficiency of manufacturing the supporting tube is improved. The pouring mould 7 comprises an arched cross pouring gate 3, an inner pouring gate 4 is connected below the cross pouring gate 3, and the cross pouring gate 3 is matched with the inner pouring gate 4, so that molten steel is uniformly injected from two sides to form a casting during pouring, the quality of the casting is improved, and the qualification rate of a product is improved; a pouring cup 10 is arranged above the cross gate 3, and a die head loose core is arranged in the middle of the pouring cup 10 in a matching manner; the arrangement of the die head core pulling is convenient for demolding of the wax mould; an exhaust rib 2 is arranged between the cross gate 3 and the pouring cup 10; the defects of air holes, slag holes and the like of the casting can be effectively avoided; the supporting pipe die 6 is arranged below the pouring die 7, and the supporting pipe die 6 is arranged to be vertical to the ingate 4; the insert 9 is arranged at one end of the supporting pipe die 6; the other end of the supporting pipe die 6 is provided with a die core-pulling 5, and the shape of the die core-pulling is matched with the inner surface of the supporting pipe, so that the molding and demolding of the wax die of the supporting pipe are facilitated. The insert 9 is a movable insert, and the insert 9 is made of 7071 aluminum alloy. The length of the supporting pipe die is 300mm at the moment by placing the insert 9 in the supporting pipe die 6; by taking out the insert 9, the length of the supporting pipe die is 350 mm; therefore, the common mode of the supporting pipes with two lengths is realized, the utilization rate of the investment casting die of the supporting pipes is improved, the production efficiency of the supporting pipes is improved, the manufacturing procedure is simplified, and the manufacturing cost is reduced. The bottom of the cross gate 3 is provided with the buffer bag 11, thereby effectively avoiding overheating caused by direct impact of molten steel from the top of the pipe fitting and improving the quality of the inner surface and the outer surface of the casting.
The casting process of the high-temperature alloy supporting tube comprises the following operation steps: firstly, performing mould making by adopting the supporting tube investment casting mould, and performing wax injection once forming to obtain a wax mould set; step two, manufacturing a shell: coating a shell material on the surface of the wax mould group, wherein zircon sand powder is adopted as a surface layer, and mullite sand powder is adopted as a transition layer and a back layer; 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 25 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: controlling the temperature of the shell at 650-800 ℃ during pouring; and sixthly, removing the shell to obtain the casting support tube.
In the first step, when the wax die set is manufactured, the insert is inlaid in the support tube die, and the length of the obtained support tube die is 300 mm; and taking out the insert to obtain the supporting pipe die with the length of 350 mm. In the fourth step, the roasting temperature is set to 1120-; the strength of the shell is higher, the temperature property is better, and molten steel leakage is not easy to occur; in the fifth step, the temperature of the shell is set to 780 ℃ during pouring, so that the fluidity and the formability of the molten steel are better in the pouring process.
In the support tube obtained by adopting the support tube casting process, the weight of a blank of the support tube with the length of 300mm is reduced to 8.1kg from the original 9kg, the weight of a blank of the support tube with the length of 350mm is reduced to 9.4kg from the original 10.5kg, and the yield of the casting process is improved to 45-50% from the original 30-32%; the consumption of molten steel is reduced, and the manufacturing cost is saved; meanwhile, the production qualification rate of the supporting tube is improved, and the production efficiency is greatly improved.
The invention is not only suitable for the high-temperature alloy supporting tube, but also suitable for other tapered pipe fittings with simple structures. 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 considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. High temperature alloy stay tube investment casting mould, its characterized in that: the die comprises a die body (8), wherein the die body (8) comprises a casting die (7), a supporting pipe die (6) and an insert (9); the casting mould (7) comprises an arched cross pouring gate (3), an inner pouring gate (4) is connected below the cross pouring gate (3), a pouring cup (10) is arranged above the cross pouring gate (3), and a die head loose core is arranged in the middle of the pouring cup (10) in a matching manner; an exhaust rib (2) is arranged between the cross gate (3) and the pouring cup (10); the supporting pipe die (6) is arranged below the pouring die (7), and the supporting pipe die (6) is arranged to be vertical to the inner pouring gate (4); the insert (9) is arranged at one end of the supporting pipe die (6); and a mould core pulling (5) is arranged at the other end of the supporting pipe mould (6).
2. The superalloy support tube investment casting mold of claim 1, wherein: the casting mould (7) and the supporting pipe mould (6) are of an integrated structure.
3. The superalloy support tube investment casting mold of claim 1, wherein: the insert (9) is a movable insert, and the insert (9) is made of 7071 aluminum alloy.
4. The superalloy support tube investment casting mold of claim 1, wherein: the bottom of the transverse pouring gate (3) is provided with a buffer bag (11).
5. The process of casting a superalloy support tube according to claim 1, wherein: the method comprises the following operation steps: firstly, performing mould making by adopting the supporting tube investment casting mould, and performing wax injection once forming to obtain a wax mould set; step two, manufacturing a shell: coating a shell material on the surface of the wax mould group, wherein zircon sand powder is adopted as a surface layer, and mullite sand powder is adopted as a transition layer and a back layer; 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 25 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: controlling the temperature of the shell at 650-800 ℃ during pouring; and sixthly, removing the shell to obtain the casting support tube.
6. The process of casting a superalloy support tube according to claim 5, wherein: in the first step, when the wax mould is manufactured, the insert is inlaid in the support pipe mould, and the length of the obtained support pipe mould is 300 mm; and taking out the insert to obtain the supporting pipe die with the length of 350 mm.
7. The process of casting a superalloy support tube according to claim 5, wherein: in the fifth step, the temperature of the mold shell is set to 780 ℃ during casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111083421.1A CN113828729A (en) | 2021-09-16 | 2021-09-16 | High-temperature alloy supporting tube investment casting mold and pouring process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111083421.1A CN113828729A (en) | 2021-09-16 | 2021-09-16 | High-temperature alloy supporting tube investment casting mold and pouring process thereof |
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| Publication Number | Publication Date |
|---|---|
| CN113828729A true CN113828729A (en) | 2021-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111083421.1A Pending CN113828729A (en) | 2021-09-16 | 2021-09-16 | High-temperature alloy supporting tube investment casting mold and pouring process thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201410542Y (en) * | 2009-06-24 | 2010-02-24 | 齐齐哈尔轨道交通装备有限责任公司 | Auxiliary tool of casting |
| CN203956016U (en) * | 2014-07-21 | 2014-11-26 | 大连远东美连精工有限公司 | A kind of model casting running gate system with three sprues |
| CN208628378U (en) * | 2018-06-25 | 2019-03-22 | 株洲中航动力精密铸造有限公司 | Bottom gating and guider the molding wax tree structure of blade vertical-type guider |
| CN111318649A (en) * | 2020-04-15 | 2020-06-23 | 广西玉柴机器配件制造有限公司 | Iron mold sand-lined process space crossing type pouring system |
| CN212525915U (en) * | 2020-06-08 | 2021-02-12 | 洛阳市钢峰工程机械制造有限公司 | One-type multi-mold casting mold convenient for mold changing and manufacturing of gate stick |
| CN212945288U (en) * | 2020-08-10 | 2021-04-13 | 深圳市科立达机械有限公司 | Investment casting structure for ice making barrel |
| 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 |
-
2021
- 2021-09-16 CN CN202111083421.1A patent/CN113828729A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201410542Y (en) * | 2009-06-24 | 2010-02-24 | 齐齐哈尔轨道交通装备有限责任公司 | Auxiliary tool of casting |
| CN203956016U (en) * | 2014-07-21 | 2014-11-26 | 大连远东美连精工有限公司 | A kind of model casting running gate system with three sprues |
| CN208628378U (en) * | 2018-06-25 | 2019-03-22 | 株洲中航动力精密铸造有限公司 | Bottom gating and guider the molding wax tree structure of blade vertical-type guider |
| CN111318649A (en) * | 2020-04-15 | 2020-06-23 | 广西玉柴机器配件制造有限公司 | Iron mold sand-lined process space crossing type pouring system |
| CN212525915U (en) * | 2020-06-08 | 2021-02-12 | 洛阳市钢峰工程机械制造有限公司 | One-type multi-mold casting mold convenient for mold changing and manufacturing of gate stick |
| CN212945288U (en) * | 2020-08-10 | 2021-04-13 | 深圳市科立达机械有限公司 | Investment casting structure for ice making barrel |
| 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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