CN111390155A - Investment casting solidification method and device - Google Patents
Investment casting solidification method and device Download PDFInfo
- Publication number
- CN111390155A CN111390155A CN202010369980.8A CN202010369980A CN111390155A CN 111390155 A CN111390155 A CN 111390155A CN 202010369980 A CN202010369980 A CN 202010369980A CN 111390155 A CN111390155 A CN 111390155A
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- Prior art keywords
- shell
- casting
- gas
- collection chamber
- bracket
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- 238000007711 solidification Methods 0.000 title claims abstract description 34
- 230000008023 solidification Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005495 investment casting Methods 0.000 title claims abstract description 23
- 238000005266 casting Methods 0.000 claims abstract description 31
- 238000007664 blowing Methods 0.000 claims abstract description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 3
- 235000011089 carbon dioxide Nutrition 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 abstract description 8
- 239000000956 alloy Substances 0.000 abstract description 8
- 239000007788 liquid Substances 0.000 abstract description 6
- 230000017525 heat dissipation Effects 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010112 shell-mould casting Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D45/00—Equipment for casting, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention provides a method and a device for investment casting solidification, wherein the method comprises the following steps: firstly, preheating a shell; secondly, after the shell preheating is finished, placing the shell on a shell bracket for pouring; step three, after the casting is finished, blowing cold air to the shell from the lower part of the shell bracket to cool the shell; stopping blowing cold air to the shell when the riser of the shell is completely solidified; and step five, obtaining the casting after the shell and the casting inside the shell are cooled to room temperature. The cooling rate of the alloy liquid is increased by utilizing high-speed airflow to flow from the bottom of the shell to the top of the shell and increasing the convection heat dissipation rate of the shell, so that a solidification sequence from bottom to top and from outside to inside is formed.
Description
Technical Field
The invention relates to the field of precision casting pouring, in particular to a method and a device for precision casting solidification of an investment mold.
Background
At present, some thin-wall aluminum alloy castings are cast by precision casting, and a shell needs to be preheated at high temperature in order to realize complete mold filling of the castings.
Although the complete mold filling of the casting is realized through high-temperature preheating, the solidification speed of the alloy liquid in the shell is very low due to the fact that the temperature of the shell is high and the heat dissipation speed of the shell is very low, the temperature gradient is not obvious, sequential solidification cannot be formed, and the problems of local looseness, large metallographic structure, low mechanical property and the like of the casting are caused.
Disclosure of Invention
The invention provides a method and a device for investment casting solidification, which improve the solidification speed of alloy liquid and relieve the problems of loose castings, large metallographic structures, low mechanical properties and the like.
The invention provides an investment casting solidification method on one hand, which comprises the following steps:
firstly, preheating a shell;
secondly, after the shell preheating is finished, placing the shell on a shell bracket for pouring;
step three, after the casting is finished, blowing cold air to the shell from the lower part of the shell bracket to cool the shell;
stopping blowing cold air to the shell when the riser of the shell is completely solidified;
and step five, obtaining the casting after the shell and the casting inside the shell are cooled to room temperature.
Optionally, the thick-walled portion of the casting is located remote from the shell carrier.
Optionally, the shell bracket is of a hollowed-out mesh structure.
Optionally, the shell bracket is arranged in a gas collection chamber, a gas inlet is arranged at the bottom of the gas collection chamber, and a fan is arranged at the gas inlet.
Optionally, the gas collection chamber is cylindrical.
Optionally, the uppermost position of the mould shell does not extend beyond the side wall of the gas collection chamber.
Optionally, a fixing device is further disposed on an inner wall of the gas collection chamber, and the fixing device is used for fixing the shell.
Optionally, a hollow pressing plate is further arranged in the gas collection chamber, and the hollow pressing plate is placed above the shell and used for fixing the shell.
Optionally, dry ice is further disposed at the gas inlet.
The invention also provides an investment casting solidification device which can be used for executing the investment casting solidification method.
In one possible implementation, the investment casting solidification device comprises: the device comprises a control panel 1, a fan 2, an air inlet channel 3, a gas collecting chamber 4 and a shell bracket 5; wherein,
a shell bracket 5 is arranged in the gas collection chamber 4, the shell bracket 5 is used for placing a shell, the bottom of the gas collection chamber 4 is provided with a gas inlet channel 3, and a fan 2 is arranged at the inlet of the gas inlet channel 3; the fan 2 is connected with the control panel 1;
the control panel 1 is used for starting and stopping the fan 2, and the fan 2 is used for sending low-temperature gas into the gas inlet channel 3; the gas inlet channel 3 introduces high velocity gas into the gas collection chamber 4.
The invention provides a method and a device for investment casting solidification, which comprises the following steps: firstly, preheating a shell; secondly, after the shell preheating is finished, placing the shell on a shell bracket for pouring; step three, after the casting is finished, blowing cold air to the shell from the lower part of the shell bracket to cool the shell; stopping blowing cold air to the shell when the riser of the shell is completely solidified; and step five, obtaining the casting after the shell and the casting inside the shell are cooled to room temperature. The cooling rate of the alloy liquid is increased by utilizing high-speed airflow to flow from the bottom of the shell to the top of the shell and increasing the convection heat dissipation rate of the shell, so that a solidification sequence from bottom to top and from outside to inside is formed.
Drawings
FIG. 1 is a schematic flow chart of an investment casting solidification method provided by the invention;
FIG. 2 is a schematic structural diagram of a solidification device of the investment casting solidification method provided by the invention;
description of reference numerals:
1-control panel; 2, a fan; 3-an air inlet channel;
4-a gas collection chamber; 5-a shell carrier; 6-shell molding.
Detailed Description
Fig. 1 is a schematic flow diagram of an investment casting solidification method provided by the present invention, fig. 2 is a schematic structural diagram of a solidification device of the investment casting solidification method provided by the present invention, and referring to fig. 1 and fig. 2, the investment casting solidification method provided by the present invention includes:
firstly, preheating a shell;
secondly, after the preheating of the shell is finished, placing the shell on a shell bracket for pouring;
step three, after the pouring is finished, blowing cold air to the shell from the lower part of the shell bracket to cool the shell;
step four, stopping blowing cold air to the shell when the riser of the shell is completely solidified;
and step five, obtaining the casting after the shell and the casting inside the shell are cooled to room temperature.
In an exemplary embodiment, the investment precision casting solidification method provided by the invention comprises the steps of preheating a shell according to the casting process requirement, immediately transferring the shell to a shell bracket for casting after the shell is preheated, immediately starting a high-speed fan to cool the shell after the casting is finished, and taking out the shell after the shell riser is completely solidified and the high-speed fan is turned off after the shell and a casting are cooled to room temperature in the air, and cutting and cleaning the shell to obtain a complete casting.
Illustratively, in order to realize the investment casting solidification method, the embodiment of the invention also provides a solidification device adopted by the investment casting solidification method. As shown in fig. 2, the apparatus includes: control panel 1, fan 2, inlet channel 3, gas collecting chamber 4, shell bracket 5, shell 6.
Illustratively, the control panel 1 is used to start and stop the fan 2. As shown in fig. 2, the blower 2 may feed the low-temperature gas into the gas inlet passage 3 at a certain speed; the gas inlet channel 3 guides high-speed gas into the gas collecting chamber 4; the gas collection chamber 4 can prevent high-speed gas flow from diffusing to the periphery, restrict the direction of the gas flow and ensure that all the gas flow can be intensively acted on the shell 6. Optionally, the shell bracket 5 is a bracket with a hollowed-out net structure, and is used for placing the shell 6 and simultaneously ensuring that the airflow in the gas collection chamber 4 is directly applied to the shell 6 through the hollowed-out bracket, so that the temperature of the shell 6 is rapidly reduced through the action of gas convection, and the solidification sequence from bottom to top and from outside to inside can be formed while the solidification speed of the alloy is improved.
Illustratively, when transferring the shell 6 to the shell carrier 5, the thick-walled portion of the casting is placed away from the shell carrier 6. The thick wall part of the casting is far away from the shell bracket, namely the thin wall is downward, and the thick wall is upward, so that the solidification sequence from bottom to top and from outside to inside is realized.
Optionally, the shell bracket 5 is disposed in the gas collection chamber 4, a gas inlet is disposed at the bottom of the gas collection chamber 4, and the fan 2 is disposed at the gas inlet. The gas inlet may be a gas inlet passage.
Optionally, the gas collection chamber 4 is cylindrical.
Alternatively, the highest position of the mould shell 6 does not extend beyond the side wall of the gas collection chamber 4.
Optionally, a fixing device is further disposed on the inner wall of the gas collecting chamber 4, and the fixing device is used for fixing the shell 6.
Optionally, a hollow pressing plate is further arranged in the gas collection chamber 4, and the hollow pressing plate is placed above the shell and used for fixing the shell 6.
Optionally, dry ice is further disposed at the gas inlet.
Taking Z L114A alloy as an example, HB963 specifies a Z L114A metal type tensile sample, and the performance requirements of a heat treatment state T6 are that the tensile strength is more than or equal to 300MPa, the elongation is more than or equal to 4%, by adopting the technology, the average value of the tensile strength of the sample reaches 343MPa, the elongation is improved by more than 14%, the elongation of the sample reaches 6.7%, and the elongation is improved by more than 67%, which indicates that the method can effectively improve the solidification rate of the alloy liquid in the shell.
The invention provides a method for investment casting solidification, which comprises the following steps: firstly, preheating a shell; secondly, after the shell preheating is finished, placing the shell on a shell bracket for pouring; step three, after the casting is finished, blowing cold air to the shell from the lower part of the shell bracket to cool the shell; stopping blowing cold air to the shell when the riser of the shell is completely solidified; and step five, obtaining the casting after the shell and the casting inside the shell are cooled to room temperature. The cooling rate of the alloy liquid is increased by utilizing high-speed airflow to flow from the bottom of the shell to the top of the shell and increasing the convection heat dissipation rate of the shell, so that a solidification sequence from bottom to top and from outside to inside is formed.
Claims (10)
1. An investment casting solidification method is characterized by comprising the following steps:
firstly, preheating a shell;
secondly, after the shell preheating is finished, placing the shell on a shell bracket for pouring;
step three, after the casting is finished, blowing cold air to the shell from the lower part of the shell bracket to cool the shell;
stopping blowing cold air to the shell when the riser of the shell is completely solidified;
and step five, obtaining the casting after the shell and the casting inside the shell are cooled to room temperature.
2. The method of claim 1, wherein the thick-walled portion of the casting is located away from the shell carrier.
3. The method of claim 1, wherein the shell carrier is an open mesh structure.
4. The method according to claim 1, characterized in that the shell carrier is arranged in a gas collection chamber, the bottom of which is provided with a gas inlet provided with a fan.
5. The method of claim 4, wherein the gas collection chamber is cylindrical.
6. A method according to claim 4, wherein the mould shell is not located at its highest position beyond the side wall of the gas collection chamber.
7. A method according to claim 1, wherein the inner wall of the gas collection chamber is further provided with fixing means for fixing the mould shell.
8. The method of claim 1, wherein a stencil platen is further disposed within the gas collection chamber, the stencil platen being positioned over the shell for securing the shell.
9. The method of claim 4, wherein the gas inlet is further provided with dry ice.
10. An investment casting solidification device, comprising: the device comprises a control panel (1), a fan (2), an air inlet channel (3), a gas collecting chamber (4) and a shell bracket (5); wherein,
a shell bracket (5) is arranged in the gas collection chamber (4), the shell bracket (5) is used for placing a shell, an air inlet channel (3) is arranged at the bottom of the gas collection chamber (4), and a fan (2) is arranged at the inlet of the air inlet channel (3); the fan (2) is connected with the control panel (1);
the control panel (1) is used for starting and stopping the fan (2), and the fan (2) is used for sending low-temperature gas into the gas inlet channel (3); the gas inlet passage (3) introduces high-velocity gas into the gas collection chamber (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010369980.8A CN111390155A (en) | 2020-04-30 | 2020-04-30 | Investment casting solidification method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010369980.8A CN111390155A (en) | 2020-04-30 | 2020-04-30 | Investment casting solidification method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111390155A true CN111390155A (en) | 2020-07-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010369980.8A Pending CN111390155A (en) | 2020-04-30 | 2020-04-30 | Investment casting solidification method and device |
Country Status (1)
| Country | Link |
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| CN (1) | CN111390155A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113600795A (en) * | 2021-06-30 | 2021-11-05 | 上海航天精密机械研究所 | Casting method for refining investment casting structure |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1787678A1 (en) * | 1990-06-12 | 1993-01-15 | Dn Metall Inst | Method of producing castings using directional crystallization |
| JP2009279647A (en) * | 2008-05-21 | 2009-12-03 | Taiyo Machinery Co Ltd | Evaporative pattern casting apparatus |
| CN201728358U (en) * | 2010-06-23 | 2011-02-02 | 贵州安吉航空精密铸造有限责任公司 | Fired mold precision casting type shell quick-cooling device |
| CN104493090A (en) * | 2014-12-11 | 2015-04-08 | 贵州红林机械有限公司 | Investment casting pouring method of thin-wall aluminum alloy casting |
| CN105728654A (en) * | 2014-12-10 | 2016-07-06 | 陕西宏远航空锻造有限责任公司 | Process for eliminating microporosity of surfaces of aluminum alloy castings |
| CN208033641U (en) * | 2018-03-09 | 2018-11-02 | 山东泰山钢铁集团有限公司 | A kind of moltening mold castings cooling device |
| CN109332660A (en) * | 2018-11-14 | 2019-02-15 | 贵州安吉航空精密铸造有限责任公司 | A kind of fired mold precision casting type shell quick-cooling device and its drilling method |
-
2020
- 2020-04-30 CN CN202010369980.8A patent/CN111390155A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1787678A1 (en) * | 1990-06-12 | 1993-01-15 | Dn Metall Inst | Method of producing castings using directional crystallization |
| JP2009279647A (en) * | 2008-05-21 | 2009-12-03 | Taiyo Machinery Co Ltd | Evaporative pattern casting apparatus |
| CN201728358U (en) * | 2010-06-23 | 2011-02-02 | 贵州安吉航空精密铸造有限责任公司 | Fired mold precision casting type shell quick-cooling device |
| CN105728654A (en) * | 2014-12-10 | 2016-07-06 | 陕西宏远航空锻造有限责任公司 | Process for eliminating microporosity of surfaces of aluminum alloy castings |
| CN104493090A (en) * | 2014-12-11 | 2015-04-08 | 贵州红林机械有限公司 | Investment casting pouring method of thin-wall aluminum alloy casting |
| CN208033641U (en) * | 2018-03-09 | 2018-11-02 | 山东泰山钢铁集团有限公司 | A kind of moltening mold castings cooling device |
| CN109332660A (en) * | 2018-11-14 | 2019-02-15 | 贵州安吉航空精密铸造有限责任公司 | A kind of fired mold precision casting type shell quick-cooling device and its drilling method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113600795A (en) * | 2021-06-30 | 2021-11-05 | 上海航天精密机械研究所 | Casting method for refining investment casting structure |
| CN113600795B (en) * | 2021-06-30 | 2023-07-14 | 上海航天精密机械研究所 | Casting method for refining investment casting structure |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200710 |