CN111168003A - Casting method of explosion-proof flange of high-voltage switch shell - Google Patents
Casting method of explosion-proof flange of high-voltage switch shell Download PDFInfo
- Publication number
- CN111168003A CN111168003A CN202010009202.8A CN202010009202A CN111168003A CN 111168003 A CN111168003 A CN 111168003A CN 202010009202 A CN202010009202 A CN 202010009202A CN 111168003 A CN111168003 A CN 111168003A
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- Prior art keywords
- flange
- explosion
- mold
- casting method
- voltage switch
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/06—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a casting method of an explosion-proof flange of a high-voltage switch shell, which comprises the following steps: p1, molding; p2, mold closing; p3, smelting; p4, preheating; p5, pouring; p6, cooling and shaping; p7, demolding; p8, pretreatment; p9, test: the casting method of the explosion-proof flange of the high-voltage switch shell adopts molding sand to manufacture the mold, and pouring is carried out after slow preheating, so that the impact of overlarge instantaneous temperature rise on the mold is avoided, the integrity of the mold is ensured, complete filling is facilitated, the quality of the flange is improved, sandstone is detected through air tightness inspection, and further, the judgment of the compact structure is facilitated, the explosion-proof effect is ensured, the generation and the processing are facilitated, and the popularization and the use are facilitated.
Description
Technical Field
The invention relates to the technical field of flanges, in particular to a casting method of an explosion-proof flange of a high-voltage switch shell.
Background
In the current industrial production, some high-voltage switch shells need to be connected by using flanges, and the explosion-proof requirement on the flanges is higher due to the high medium pressure, so that the airtightness of the flanges needs to be guaranteed.
But current flange is adding in the casting, it is direct to pour the molten iron into the mould and stereotypes mostly, because the difference in temperature of mould and molten iron is great, cause the mould high temperature in the twinkling of an eye when pouring, will cause the impact to the mould, and then influence mould integrality, not only influence the mobility of molten iron, cause the pouring imperfection, and still cause the mould defect easily, influence the flange quality, can only inspect the outward appearance after accomplishing the pouring simultaneously, can not pass through the gas tightness inspection sand hole gas leakage state, reduce the flange quality, consequently, need provide a new method.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a casting method of an explosion-proof flange of a high-voltage switch shell.
In order to achieve the purpose, the invention adopts the following technical scheme:
a casting method of an explosion-proof flange of a high-voltage switch shell comprises the following steps:
p1, molding: manufacturing a flange mould according to the size specification of the flange, placing the mould into a filling box, filling molding sand, and manufacturing an upper half mould and a lower half mould;
p2, mold closing: spraying a release agent in the cavity of the upper half mold and the lower half mold, airing and then closing the molds to form a complete mold;
p3, smelting: placing the raw materials into an electric heating furnace, heating to 1400-1450 ℃ to a molten state to obtain cast molten iron;
p4, preheating: preheating the complete mold to 400-500 ℃ to obtain a preheated mold;
p5, pouring: pouring the cast molten iron into the preheating grinding tool from the pouring gate to fill the cavity of the mould;
p6, cooling and shaping: cooling the die and shaping the flange;
p7, demolding: opening the mould, cleaning the molding sand, taking out the flange blank, and demoulding;
p8, pretreatment: cleaning the flange blank, and polishing the inner surface and the outer surface to obtain a pretreated blank;
p9, test: and (4) carrying out air tightness inspection on the pretreated blank, and finishing flange casting after the blank is qualified.
Preferably, the release agent in the step P2 is 15-20% of liquid paraffin, 15-20% of colloidal graphite, 10-15% of ethylene glycol, 2-10% of abietic acid and 30-60% of silicone oil.
Preferably, the raw material in the step P3 comprises 2-2.5% of carbon, 0.3-0.5% of silicon, 0.3-0.5% of manganese, 1-4% of nickel, 2-5% of titanium, 3-8% of zinc, and the balance of iron and inevitable impurities.
Preferably, the preheating temperature rise rate of the P4 step is 20 to 25 degrees per minute and the heat is preserved for 10 to 15 minutes.
Preferably, the cooling mode of the P6 step is air cooling or circulating water cooling for the outer side of the die.
Preferably, the demolding temperature of the step P7 is 30-40 ℃, and the sand mold is crushed.
Preferably, the pretreatment of step P8 further comprises flash burr removal and casting head removal.
Preferably, the method for checking the airtightness of the P9 step comprises the following steps:
q1, installing two airtight pipelines at two sides of the flange blank, and installing a gas pressure meter;
q2, keeping the atmospheric pressure state of the pipeline at one side, introducing 0.5MPa of air pressure into the pipeline at the other side, sealing the inflation inlet, and maintaining the pressure;
q3, whole submerged in water bath for 15 to 20 minutes;
q4, observing the state of bubbles in the water bath and the numerical change of a pressure gauge;
q5, if no obvious bubble exists and the pressure gauge value changes obviously, the product is qualified, and if not, the product is not qualified.
According to the casting method of the explosion-proof flange of the high-voltage switch shell, the mould is made of the molding sand, pouring is carried out after slow preheating, the phenomenon that the mould is impacted due to overlarge instantaneous temperature rise is avoided, the integrity of the mould is guaranteed, complete filling is facilitated, the quality of the flange is improved, and the sandstone is detected through air tightness inspection, so that the judgment of the structure compactness is facilitated, the explosion-proof effect is guaranteed, the generation and processing are facilitated, and the popularization and the use are convenient.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A casting method of an explosion-proof flange of a high-voltage switch shell comprises the following steps:
p1, molding: manufacturing a flange mould according to the size specification of the flange, placing the mould into a filling box, filling molding sand, and manufacturing an upper half mould and a lower half mould;
p2, mold closing: spraying a release agent in the cavity of the upper half mold and the lower half mold, airing and then closing the molds to form a complete mold;
p3, smelting: placing the raw materials into an electric heating furnace, heating to 1400-1450 ℃ to a molten state to obtain cast molten iron;
p4, preheating: preheating the complete mold to 400-500 ℃ to obtain a preheated mold;
p5, pouring: pouring the cast molten iron into the preheating grinding tool from the pouring gate to fill the cavity of the mould;
p6, cooling and shaping: cooling the die and shaping the flange;
p7, demolding: opening the mould, cleaning the molding sand, taking out the flange blank, and demoulding;
p8, pretreatment: cleaning the flange blank, and polishing the inner surface and the outer surface to obtain a pretreated blank;
p9, test: and (4) carrying out air tightness inspection on the pretreated blank, and finishing flange casting after the blank is qualified.
Preferably, the release agent in the step P2 is 15-20% of liquid paraffin, 15-20% of colloidal graphite, 10-15% of ethylene glycol, 2-10% of abietic acid and 30-60% of silicone oil.
Preferably, the raw material of the step P3 comprises 2-2.5% of carbon, 0.3-0.5% of silicon, 0.3-0.5% of manganese, 1-4% of nickel, 2-5% of titanium, 3-8% of zinc, and the balance of iron and inevitable impurities.
Preferably, the preheating temperature rise rate of the P4 step is 20 to 25 degrees per minute and the heat is maintained for 10 to 15 minutes.
Preferably, the cooling manner in the step P6 is air cooling or circulating water cooling for the outside of the mold.
Preferably, the demolding temperature of the step P7 is 30 to 40 ℃, and the sand mold is subjected to crushing treatment.
Preferably, the pretreatment of step P8 further comprises flash burr removal and casting head removal.
Preferably, the method for checking airtightness in the step P9 comprises the following steps:
q1, installing two airtight pipelines at two sides of the flange blank, and installing a gas pressure meter;
q2, keeping the atmospheric pressure state of the pipeline at one side, introducing 0.5MPa of air pressure into the pipeline at the other side, sealing the inflation inlet, and maintaining the pressure;
q3, whole submerged in water bath for 15 to 20 minutes;
q4, observing the state of bubbles in the water bath and the numerical change of a pressure gauge;
q5, if no obvious bubble exists and the pressure gauge value changes obviously, the product is qualified, and if not, the product is not qualified.
According to the casting method of the explosion-proof flange of the high-voltage switch shell, the mould is made of the molding sand, pouring is carried out after slow preheating, the phenomenon that the mould is impacted due to overlarge instantaneous temperature rise is avoided, the integrity of the mould is guaranteed, complete filling is facilitated, the quality of the flange is improved, and the sandstone is detected through air tightness inspection, so that the judgment of the structure compactness is facilitated, the explosion-proof effect is guaranteed, the generation and processing are facilitated, and the popularization and the use are convenient.
Example 1
A casting method of an explosion-proof flange of a high-voltage switch shell comprises the following steps:
p1, molding: manufacturing a flange mould according to the size specification of the flange, placing the mould into a filling box, filling molding sand, and manufacturing an upper half mould and a lower half mould;
p2, mold closing: spraying a release agent in the cavity of the upper half mold and the lower half mold, airing and then closing the molds to form a complete mold;
p3, smelting: placing the raw materials into an electric heating furnace, heating to 1400-1450 ℃ to a molten state to obtain cast molten iron;
p4, preheating: preheating the complete mold to 400-500 ℃ to obtain a preheated mold;
p5, pouring: pouring the cast molten iron into the preheating grinding tool from the pouring gate to fill the cavity of the mould;
p6, cooling and shaping: cooling the die and shaping the flange;
p7, demolding: opening the mould, cleaning the molding sand, taking out the flange blank, and demoulding;
p8, pretreatment: cleaning the flange blank, and polishing the inner surface and the outer surface to obtain a pretreated blank;
p9, test: and (4) carrying out air tightness inspection on the pretreated blank, and finishing flange casting after the blank is qualified.
Preferably, the release agent in the step P2 is 20% of liquid paraffin, 20% of colloidal graphite, 10% of ethylene glycol, 3% of abietic acid and 47% of silicone oil.
Preferably, the raw material of the P3 step includes 2.5% of carbon, 0.4% of silicon, 0.5% of manganese, 1% -4% of nickel, 2.2% of titanium, 4.6% of zinc, and the balance of iron and unavoidable impurities.
Preferably, the preheat temperature rise rate for the P4 step is 25 degrees per minute with 10 minutes of incubation.
Preferably, the cooling manner in the step P6 is circulating water cooling for the outside of the mold.
Preferably, the demolding temperature of the step P7 is 35 ℃ and the sand mold is subjected to crushing treatment.
Preferably, the pretreatment of step P8 further comprises flash burr removal and casting head removal.
Preferably, the method for checking airtightness in the step P9 comprises the following steps:
q1, installing two airtight pipelines at two sides of the flange blank, and installing a gas pressure meter;
q2, keeping the atmospheric pressure state of the pipeline at one side, introducing 0.5MPa of air pressure into the pipeline at the other side, sealing the inflation inlet, and maintaining the pressure;
q3, whole submerged in water bath for 15 to 20 minutes;
q4, observing the state of bubbles in the water bath and the numerical change of a pressure gauge;
q5, if no obvious bubble exists and the pressure gauge value changes obviously, the product is qualified, and if not, the product is not qualified.
Example 2
A casting method of an explosion-proof flange of a high-voltage switch shell comprises the following steps:
p1, molding: manufacturing a flange mould according to the size specification of the flange, placing the mould into a filling box, filling molding sand, and manufacturing an upper half mould and a lower half mould;
p2, mold closing: spraying a release agent in the cavity of the upper half mold and the lower half mold, airing and then closing the molds to form a complete mold;
p3, smelting: placing the raw materials into an electric heating furnace, heating to 1400-1450 ℃ to a molten state to obtain cast molten iron;
p4, preheating: preheating the complete mold to 400-500 ℃ to obtain a preheated mold;
p5, pouring: pouring the cast molten iron into the preheating grinding tool from the pouring gate to fill the cavity of the mould;
p6, cooling and shaping: cooling the die and shaping the flange;
p7, demolding: opening the mould, cleaning the molding sand, taking out the flange blank, and demoulding;
p8, pretreatment: cleaning the flange blank, and polishing the inner surface and the outer surface to obtain a pretreated blank;
p9, test: and (4) carrying out air tightness inspection on the pretreated blank, and finishing flange casting after the blank is qualified.
Preferably, the release agent in the step P2 is 15% of liquid paraffin, 15% of colloidal graphite, 10% of ethylene glycol, 8% of abietic acid and 52% of silicone oil.
Preferably, the raw material of the P3 step includes 2% of carbon, 0.5% of silicon, 0.3% of manganese, 1% of nickel, 2% of titanium, 5% of zinc, and the balance of iron and unavoidable impurities.
Preferably, the preheating temperature rise rate of the P4 step is 20 degrees per minute and the temperature is maintained for 15 minutes.
Preferably, the cooling method in the step P6 is air cooling on the outside of the mold.
Preferably, the demolding temperature of the step P7 is 30 ℃ and the sand mold is subjected to crushing treatment.
Preferably, the pretreatment of step P8 further comprises flash burr removal and casting head removal.
Preferably, the method for checking airtightness in the step P9 comprises the following steps:
q1, installing two airtight pipelines at two sides of the flange blank, and installing a gas pressure meter;
q2, keeping the atmospheric pressure state of the pipeline at one side, introducing 0.5MPa of air pressure into the pipeline at the other side, sealing the inflation inlet, and maintaining the pressure;
q3, whole submerged in water bath for 15 to 20 minutes;
q4, observing the state of bubbles in the water bath and the numerical change of a pressure gauge;
q5, if no obvious bubble exists and the pressure gauge value changes obviously, the product is qualified, and if not, the product is not qualified.
Claims (8)
1. A casting method of an explosion-proof flange of a high-voltage switch shell is characterized by comprising the following steps: the casting method comprises the following steps:
p1, molding: manufacturing a flange mould according to the size specification of the flange, placing the mould into a filling box, filling molding sand, and manufacturing an upper half mould and a lower half mould;
p2, mold closing: spraying a release agent in the cavity of the upper half mold and the lower half mold, airing and then closing the molds to form a complete mold;
p3, smelting: placing the raw materials into an electric heating furnace, heating to 1400-1450 ℃ to a molten state to obtain cast molten iron;
p4, preheating: preheating the complete mold to 400-500 ℃ to obtain a preheated mold;
p5, pouring: pouring the cast molten iron into the preheating grinding tool from the pouring gate to fill the cavity of the mould;
p6, cooling and shaping: cooling the die and shaping the flange;
p7, demolding: opening the mould, cleaning the molding sand, taking out the flange blank, and demoulding;
p8, pretreatment: cleaning the flange blank, and polishing the inner surface and the outer surface to obtain a pretreated blank;
p9, test: and (4) carrying out air tightness inspection on the pretreated blank, and finishing flange casting after the blank is qualified.
2. The casting method of the explosion-proof flange of the high-voltage switch shell according to claim 1, characterized in that: the release agent in the step P2 is 15-20% of liquid paraffin, 15-20% of colloidal graphite, 10-15% of ethylene glycol, 2-10% of abietic acid and 30-60% of silicone oil.
3. The casting method of the explosion-proof flange of the high-voltage switch shell according to claim 1, characterized in that: the raw materials of the step P3 comprise 2-2.5% of carbon, 0.3-0.5% of silicon, 0.3-0.5% of manganese, 1-4% of nickel, 2-5% of titanium, 3-8% of zinc, and the balance of iron and inevitable impurities.
4. The casting method of the explosion-proof flange of the high-voltage switch shell according to claim 1, characterized in that: the preheating temperature rise rate of the P4 step is 20-25 degrees per minute, and the temperature is kept for 10-15 minutes.
5. The casting method of the explosion-proof flange of the high-voltage switch shell according to claim 1, characterized in that: the cooling mode of the P6 step is air cooling or circulating water cooling for the outer side of the die.
6. The casting method of the explosion-proof flange of the high-voltage switch shell according to claim 1, characterized in that: and the demolding temperature of the step P7 is 30-40 ℃, and the sand mold is crushed.
7. The casting method of the explosion-proof flange of the high-voltage switch shell according to claim 1, characterized in that: the P8 step pretreatment also includes flash burr removal and casting head removal.
8. The casting method of the explosion-proof flange of the high-voltage switch shell according to claim 1, characterized in that: the method for checking the air tightness in the step P9 comprises the following steps:
q1, installing two airtight pipelines at two sides of the flange blank, and installing a gas pressure meter;
q2, keeping the atmospheric pressure state of the pipeline at one side, introducing 0.5MPa of air pressure into the pipeline at the other side, sealing the inflation inlet, and maintaining the pressure;
q3, whole submerged in water bath for 15 to 20 minutes;
q4, observing the state of bubbles in the water bath and the numerical change of a pressure gauge;
q5, if no obvious bubble exists and the pressure gauge value changes obviously, the product is qualified, and if not, the product is not qualified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010009202.8A CN111168003A (en) | 2020-01-06 | 2020-01-06 | Casting method of explosion-proof flange of high-voltage switch shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010009202.8A CN111168003A (en) | 2020-01-06 | 2020-01-06 | Casting method of explosion-proof flange of high-voltage switch shell |
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| Publication Number | Publication Date |
|---|---|
| CN111168003A true CN111168003A (en) | 2020-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010009202.8A Pending CN111168003A (en) | 2020-01-06 | 2020-01-06 | Casting method of explosion-proof flange of high-voltage switch shell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113649505A (en) * | 2021-08-17 | 2021-11-16 | 扬中市旭晨精密模锻有限公司 | Manufacturing process and inspection equipment of flange valve body forge piece |
| CN114378253A (en) * | 2022-01-12 | 2022-04-22 | 高唐县瑞升机械配件有限公司 | Carbon-free environment-friendly green sand casting process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2518890A (en) * | 1946-01-19 | 1950-08-15 | Heron John Aherne | Die sinking |
| CN101875090A (en) * | 2010-07-16 | 2010-11-03 | 吴江市液铸液压件铸造有限公司 | Flange casting production process |
| CN103056296A (en) * | 2012-12-12 | 2013-04-24 | 青岛三合山精密铸造有限公司 | Sand mold casting production method of flange casting |
| CN202934103U (en) * | 2012-11-28 | 2013-05-15 | 中国西电电气股份有限公司 | Casting mould of pressure-resistant cast aluminum cover plate used for high-voltage switch |
| CN105928671A (en) * | 2016-04-20 | 2016-09-07 | 浙江卡博铜业有限公司 | Fire valve pressure test equipment and detection method thereof |
-
2020
- 2020-01-06 CN CN202010009202.8A patent/CN111168003A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2518890A (en) * | 1946-01-19 | 1950-08-15 | Heron John Aherne | Die sinking |
| CN101875090A (en) * | 2010-07-16 | 2010-11-03 | 吴江市液铸液压件铸造有限公司 | Flange casting production process |
| CN202934103U (en) * | 2012-11-28 | 2013-05-15 | 中国西电电气股份有限公司 | Casting mould of pressure-resistant cast aluminum cover plate used for high-voltage switch |
| CN103056296A (en) * | 2012-12-12 | 2013-04-24 | 青岛三合山精密铸造有限公司 | Sand mold casting production method of flange casting |
| CN105928671A (en) * | 2016-04-20 | 2016-09-07 | 浙江卡博铜业有限公司 | Fire valve pressure test equipment and detection method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113649505A (en) * | 2021-08-17 | 2021-11-16 | 扬中市旭晨精密模锻有限公司 | Manufacturing process and inspection equipment of flange valve body forge piece |
| CN114378253A (en) * | 2022-01-12 | 2022-04-22 | 高唐县瑞升机械配件有限公司 | Carbon-free environment-friendly green sand casting process |
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Application publication date: 20200519 |