CN110918904B - Sand shooting plate and method for manufacturing fine sand core - Google Patents
Sand shooting plate and method for manufacturing fine sand core Download PDFInfo
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- CN110918904B CN110918904B CN201911158661.6A CN201911158661A CN110918904B CN 110918904 B CN110918904 B CN 110918904B CN 201911158661 A CN201911158661 A CN 201911158661A CN 110918904 B CN110918904 B CN 110918904B
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- sand
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- sand shooting
- shooting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/23—Compacting by gas pressure or vacuum
- B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C19/00—Components or accessories for moulding machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention belongs to the field of casting, and relates to a sand shooting plate and a manufacturing method of a fine sand core, wherein the sand shooting plate comprises a sand shooting plate body, a sink groove is arranged on the sand shooting plate body, and a sand shooting hole is arranged at the bottom of the sink groove; a baffle plate is arranged in the sinking groove; the baffle is arranged at the top of the sand shooting hole, and a sand shooting flow passage is arranged between the baffle and the sink groove; the sand shooting flow passage is communicated with a sand shooting hole at the bottom of the sink tank. The invention provides a method for manufacturing a fine sand core, which is easy to form and can effectively ensure the quality of the sand core.
Description
Technical Field
The invention belongs to the field of casting, relates to a sand shooting plate and a manufacturing method of a fine sand core, and particularly relates to a manufacturing method of a fine sand core with the diameter of not less than 2mm and not more than 5 mm.
Background
Due to the requirements of weight reduction and energy conservation of an aeroengine, the design of a shell of a fuel accessory is more and more precise, most of the shell needs to be directly cast with a bent slender oil way hole with the diameter (D) of more than or equal to 2mm and less than 5mm for conveying hydraulic oil, lubricating oil, cooling media and the like, and the whole body of the liquid oil way is fine, staggered, bent and distributed in the inner cavity of a casting.
During casting of the shell, the oil passages of the inner cavity of the casting are generally formed by cores, and for the complex inner cavity, sand cores are generally adopted. In the process of manufacturing the sand core, the core manufacturing process is to inject the precoated sand into a hot core box for manufacturing the sand core by using a core shooter, a heating rod is arranged on a half mould of a core box mould, the temperature of the half mould is set to be 220-300 ℃, the blowing pressure is 0.3-0.5 MPa, and the crusting and hardening time of the sand core is 3-10 min. And opening the mold after hardening, and taking out the sand core. In order to reduce the gas evolution of the sand core, the sand core needs to be baked before casting, the sand core is charged at the temperature of below 100 ℃, and then the temperature is gradually raised to the baking temperature. The baking temperature of the sand core is 160-200 ℃, and the heat preservation time is 1 h. However, the process method can only manufacture sand cores with the diameter of more than 6mm at present, and cannot manufacture fine sand cores with the diameter ranging from 2mm to 5 mm.
In practical production, a copper pipe is mostly adopted for a slender oil path with the diameter of less than 5mm, the slender oil path is bent into the shape of the oil path, a refractory coating is coated on the outer part of the copper pipe and used as a core, and after a casting is cast, the copper pipe is removed by a hydrochloric acid corrosion method. The method has the defects that the bent copper pipe is difficult to accurately meet the size of the inner cavity of the designed casting, the condition of small oil way section change is difficult to solve, and the bent part of the copper pipe is smooth and can not be flatly deformed and effectively controlled; in addition, if the copper pipe in the aluminum alloy casting is not completely corroded, the oil way is blocked, the flow is influenced during the test, and meanwhile, residues in an inner cavity of the oil way are potential safety hazards.
Disclosure of Invention
In order to solve the above technical problems in the background art, the present invention provides a method for manufacturing a fine sand core, which is easy to mold and can effectively ensure the quality of the sand core.
In order to achieve the purpose, the invention adopts the following technical scheme:
a sand shooting plate is characterized in that: the sand shooting plate comprises a sand shooting plate body, a sink groove is arranged on the sand shooting plate body, and a sand shooting hole is formed in the bottom of the sink groove; a baffle plate is arranged in the sinking groove; the baffle is arranged at the top of the sand shooting hole, and a sand shooting flow passage is arranged between the baffle and the sink; and the sand shooting flow passage is communicated with a sand shooting hole at the bottom of the sink tank.
The width of the sand shooting runner is not more than 5 mm.
The diameter of the sand shooting hole is 3-6 mm.
The sand shooting plate also comprises a screw for fixing the baffle plate, and a gasket is sleeved on the screw; the baffle is fixed at the bottom of the sinking groove through a screw and a gasket.
The sand shooting plate body is provided with a trapezoid groove, and a high-temperature-resistant sealing ring is arranged in the trapezoid groove.
The method for manufacturing the fine sand core based on the sand shooting plate is characterized by comprising the following steps: the manufacturing method of the fine sand core comprises the following steps:
1) installing a sand shooting plate on a sand core mould, enabling a sand shooting hole of the sand shooting plate to be opposite to and sealed with a blowing port on the sand core mould, and installing the sand shooting plate on a core shooting machine;
2) preheating a sand core mould by using a heating rod, wherein the preheating temperature of the sand core mould is 180-210 ℃;
3) adjusting the blowing pressure to make the blowing pressure be 0.65 +/-0.05 MPa;
4) blowing the sand core, and hardening the crust of the sand core after blowing is finished, wherein the hardening time is 2 +/-0.5 min;
5) opening the mould and taking out the manufactured sand core;
6) and placing the sand core on a bracket, and baking at the temperature of 130 +/-10 ℃ for not less than 1 h.
The invention has the advantages that:
the invention provides a method for manufacturing a sand shooting plate and a fine sand core, wherein the preheating temperature of a mold is set to be 180-210 ℃, so that the fluidity of precoated sand in the mold during blowing is enhanced; secondly, the sand blowing pressure is adjusted to be 0.65 +/-0.05 MPa, the sand blowing pressure of the precoated sand is increased, and a guarantee is provided for filling sand in a long and thin channel of a mold cavity; a special sand shooting plate is designed, sand passes through a sand shooting hole through a 5mm gap of the sand shooting plate and enters a mold cavity, so that the sand blowing pressure is further increased, and meanwhile, the baffle in the square groove of the sand shooting plate increases the reflection force in the sand blowing process, so that the mold cavity is favorably filled with the sand; and finally, setting the incrustation time to be 2 +/-0.5 min for increasing the strength of the shell core by adjusting the incrustation time. The shell core manufactured in the way can be well stored on the movable half die, and then the shell core is ejected out through the movable half die ejection system to form the complete shell core. The manufacturing method of the fine shell core creatively utilizes the conventional hot core box core shooter to successfully manufacture the fine sand core with the diameter (D) of less than 5mm and more than or equal to 2mm, and well solves the problem that the slender sand core is difficult to form. Fills the technical blank in the field, breaks through the stationary thinking in the industry and obtains good technical effect.
Drawings
FIG. 1 is a schematic structural diagram of a sand shooting plate provided by the present invention;
FIG. 2 is a schematic cross-sectional view of FIG. 1;
FIG. 3 is a schematic view of the configuration of a sand core mold with a sand shooting plate installed;
wherein:
1-shooting plate body; 2-sinking the tank; 3-shooting a sand hole; 4-a baffle plate; 5-a screw; 6-a gasket; 7-high temperature resistant sealing ring; 8-fine sand cores to be processed; 9-fixing the half mould; 10-moving mold half.
Detailed Description
Referring to fig. 1 and 2, the invention provides a sand shooting plate, which comprises a sand shooting plate body 1, wherein a sink groove 2 is arranged on the sand shooting plate body 1, and a sand shooting hole 3 is arranged at the bottom of the sink groove 2; a baffle plate 4 is arranged in the sinking groove 2; the baffle 4 is arranged at the top of the sand shooting hole 3, and a sand shooting flow passage is arranged between the baffle and the sink 2; the sand shooting flow passage is communicated with a sand shooting hole 3 at the bottom of the sink tank 2. The width of the sand shooting flow passage is not more than 5 mm. The diameter of the sand shooting hole 3 is 3-6 mm.
The sand shooting plate also comprises a screw 5 for fixing the baffle 4, and a gasket 6 is sleeved on the screw; the baffle 4 is fixed at the bottom of the sinking groove 2 through a bolt 5 and a gasket 6.
The sand shooting plate body 1 is provided with a trapezoid groove, and a high-temperature resistant sealing ring 7 is arranged in the trapezoid groove.
The manufacturing method of the fine sand core based on the sand shooting plate comprises the following steps:
1) installing a sand shooting plate on a sand core mould, enabling a sand shooting hole 3 of the sand shooting plate to be opposite to and sealed with a blowing port on the sand core mould, and installing the sand shooting plate on a core shooting machine;
2) preheating a sand core mould by using a heating rod, wherein the preheating temperature of the sand core mould is 180-210 ℃;
3) adjusting the blowing pressure to make the blowing pressure be 0.65 +/-0.05 MPa;
4) blowing the sand core, and hardening the crust of the sand core after blowing is finished, wherein the hardening time is 2 +/-0.5 min;
5) opening the mould and taking out the manufactured sand core;
6) and placing the sand core on a bracket, and baking at the temperature of 130 +/-10 ℃ for not less than 1 h.
Compared with the prior art, the prior art has the semi-module preheating temperature of 220-300 ℃, the blowing pressure of 0.3-0.5 MPa and the hardening time of the sand core crust of 3-10 min. Usually only shells cores of more than 5mm can be manufactured. The invention creatively adopts the conventional hot core box core shooter to manufacture the tiny shell core with the diameter (D) of less than or equal to 2mm and less than 5 mm. The preheating temperature of the mold is set to be 180-210 ℃, so that the fluidity of the precoated sand in the mold during blowing is enhanced; secondly, the sand blowing pressure is adjusted to be 0.65 +/-0.05 MPa, the sand blowing pressure of the precoated sand is increased, and a guarantee is provided for filling sand in a long and thin channel of a mold cavity; a special sand shooting plate is designed, sand passes through a sand shooting hole through a 5mm gap of the sand shooting plate and enters a mold cavity, so that the sand blowing pressure is further increased, and meanwhile, the baffle in the square groove of the sand shooting plate increases the reflection force in the sand blowing process, so that the mold cavity is favorably filled with the sand; and finally, setting the incrustation time to be 2 +/-0.5 min for increasing the strength of the shell core by adjusting the incrustation time. The shell core manufactured in the way can be well stored on the movable half die, and then the shell core is ejected out through the movable half die ejection system to form the complete shell core. The manufacturing method of the fine shell core creatively utilizes the conventional hot core box core shooter to successfully manufacture the fine sand core with the diameter (D) of less than 5mm and more than or equal to 2mm, and well solves the problem that the slender sand core is difficult to form. Fills the technical blank in the field, breaks through the stationary thinking in the industry and obtains good technical effect.
Referring to fig. 3, the sand core mold adopted by the invention is a hot core box mold, and comprises a movable half mold 10, a fixed half mold 9, a movable half mold ejection system, a fixed half mold ejection system, a heating rod, a thermocouple and the like; the sand core mould is also provided with a sand shooting plate, and the sand shooting plate can effectively improve the sand shooting pressure and avoid the meat deficiency phenomenon of the fine sand core; the sand shooting plate comprises a sand shooting plate body, a baffle plate, a gasket, a screw, a high-temperature-resistant sealing ring and the like; a rectangular sink groove is formed in the upper surface of the sand shooting plate body, sand shooting holes are distributed in the center of the sink groove, and trapezoidal grooves are formed in the periphery of the sand shooting holes in the bottom surface of the sand shooting plate and used for installing sealing rings; the sand shooting plate baffle is arranged in the rectangular sinking groove through a gasket and a screw, and the height between the baffle and the bottom surface of the rectangular sinking groove is 5 mm; when shooting sand, the sand passes through a gap of 5mm and enters a blowing opening of the die through a sand shooting hole; the diameter of the sand shooting hole is 3-6 mm; when the fine sand core is designed, reinforcing ribs need to be designed at the positions with complex bending and large bending, and the sand core can be taken out smoothly after being opened.
This embodiment is an example of casting an aluminum alloy casing with a small oil passage by applying the present invention. The material of the shell is ZL101A, the maximum external dimension of the casting is 160mm multiplied by 120mm multiplied by 100mm, and the inner cavity of the casting is provided with 3 oil paths with different sections, the diameter (D) of which is more than or equal to 2mm and less than 5 mm.
Example (b):
firstly, a sand core mould is arranged on a core shooting machine, and a special sand shooting plate is arranged on the core shooting machine; and (5) switching on a power supply, and preheating the die by using the heating rod. The preheating temperature of the die is controlled at 180 ℃; opening the mold to check the cavity, confirming that the cavity has no foreign matter residue, and closing the mold after no bump damage; adjusting the sand core blowing pressure to 0.6MPa, and adjusting the sand core hardening time to 2.5 min; then aligning the sand shooting hole of the special sand shooting plate with a die blowing port and then blowing the sand core; after the sand core is blown, waiting for the crust of the sand core to be hardened; after the hardening time of the sand core crust is over, opening the die, leaving the sand core on the movable half die, and ejecting the sand core by the movable half die ejection system; after the sand core is taken out of the mold, the sand core is lightly put on a table top in a tray padded with asbestos cloth in sequence; after the temperature is reduced, polishing and cleaning the fash and the reinforcing ribs of the sand core; placing the sand cores on the bracket, keeping a 15mm gap between the sand cores, loading the whole furnace in a dish, and then gradually heating to the baking temperature. The baking temperature of the sand core is 130 ℃, the heat preservation time is 1h, and the sand core is cooled along with the furnace for standby.
Claims (1)
1. A method for manufacturing a fine sand core is characterized in that: the manufacturing method of the fine sand core comprises the following steps:
1) installing a sand shooting plate on a sand core mould, enabling a sand shooting hole (3) of the sand shooting plate to be opposite to and sealed with a blowing port on the sand core mould, and installing the sand shooting plate on a core shooting machine; the sand shooting plate comprises a sand shooting plate body (1), a sink groove (2) is arranged on the sand shooting plate body (1), and sand shooting holes (3) are formed in the bottom of the sink groove (2); a baffle (4) is arranged in the sinking groove (2); the baffle (4) is arranged at the top of the sand shooting hole (3) and a sand shooting flow passage is arranged between the baffle and the sink tank (2); the sand shooting flow passage is communicated with a sand shooting hole (3) at the bottom of the sink tank (2);
2) preheating a sand core mould by using a heating rod, wherein the preheating temperature of the sand core mould is 180-210 ℃;
3) adjusting the blowing pressure to make the blowing pressure be 0.65 +/-0.05 MPa;
4) blowing the sand core, and hardening the crust of the sand core after blowing is finished, wherein the hardening time is 2 +/-0.5 min;
5) opening the mould and taking out the manufactured sand core;
6) placing the sand core on a bracket, and baking at the temperature of 130 +/-10 ℃ for not less than 1 h;
the diameter of the fine sand core is D, and D is more than or equal to 2mm and less than 5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911158661.6A CN110918904B (en) | 2019-11-22 | 2019-11-22 | Sand shooting plate and method for manufacturing fine sand core |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911158661.6A CN110918904B (en) | 2019-11-22 | 2019-11-22 | Sand shooting plate and method for manufacturing fine sand core |
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| Publication Number | Publication Date |
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| CN110918904A CN110918904A (en) | 2020-03-27 |
| CN110918904B true CN110918904B (en) | 2021-09-17 |
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| CN205571353U (en) * | 2016-05-04 | 2016-09-14 | 江阴机械制造有限公司 | General type shooting plate |
| CN205668049U (en) * | 2016-06-03 | 2016-11-02 | 江苏泽茗精密机械制造股份有限公司 | Penetrate the sand ejection board device of sand machine |
| CN207325895U (en) * | 2017-09-30 | 2018-05-08 | 侯马市东鑫机械铸造有限公司 | A kind of sand ejection board of Iron Mould Coated Sand moulding |
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2019
- 2019-11-22 CN CN201911158661.6A patent/CN110918904B/en active Active
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|---|---|---|---|---|
| CN101172302A (en) * | 2007-09-29 | 2008-05-07 | 沈阳铸造研究所 | Modified silicate-bonded sand temperature core box core-producing technique |
| CN202207778U (en) * | 2011-09-22 | 2012-05-02 | 宁波全力机械模具有限公司 | Special ejection plate for precoated sand |
| CN202224608U (en) * | 2011-09-22 | 2012-05-23 | 广西玉林玉柴机器配件制造有限公司 | Water cooling baffle type detachable sand shooting device |
| CN102699280A (en) * | 2012-06-30 | 2012-10-03 | 南车戚墅堰机车车辆工艺研究所有限公司 | Sand mould of precoated sand for casting single piston ring and manufacturing method of sand mould |
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| CN104043786A (en) * | 2014-06-24 | 2014-09-17 | 南通华东油压科技有限公司 | Casting process of hydraulic main valve casting of 20-ton excavator |
| CN104226923A (en) * | 2014-09-22 | 2014-12-24 | 青阳县天平机械制造有限公司 | Iron die sand overlaying process for producing steering axle |
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| CN110918904A (en) | 2020-03-27 |
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