CN111036889A - Process method for strengthening pressure-resistant quality of aluminum alloy - Google Patents
Process method for strengthening pressure-resistant quality of aluminum alloy Download PDFInfo
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- CN111036889A CN111036889A CN201911336905.5A CN201911336905A CN111036889A CN 111036889 A CN111036889 A CN 111036889A CN 201911336905 A CN201911336905 A CN 201911336905A CN 111036889 A CN111036889 A CN 111036889A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
- B22D31/002—Cleaning, working on castings
- B22D31/005—Sealing or impregnating porous castings
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/12—Materials for stopping leaks, e.g. in radiators, in tanks
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
The invention provides a process method for strengthening the pressure-resistant quality of an aluminum alloy, which belongs to the technical field of aluminum alloy castings. The process method is characterized in that a seepage and compensation liquid is prepared, the seepage and compensation liquid gradually permeates into the inner loose part and the pin hole part of the casting under the positive pressure condition, the casting is heated, insulated and cooled in a sectional manner, a certain temperature gradient is always formed on the inner wall of the casting, the seepage and compensation effect of the casting is improved, the seepage and compensation liquid is finally condensed and solidified under the positive pressure, and the phenomenon of pressing and seepage is prevented.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy castings, and particularly relates to a process method for filling an inorganic filling agent by utilizing positive pressure to repair the defects of small-sized looseness, pinholes and the like in the castings, strengthen the internal quality of the castings and improve the pressure resistance of the aluminum castings.
Background
The military product is a key scientific research and production project of the northern important group of inner Mongolia, wherein different types of high, medium, low-speed and precision transmission case body castings are adopted, the materials are high-strength cast aluminum alloys independently researched and developed by companies, the technical conditions of the product require that the castings are subjected to a gas tightness test after being processed, and the pressure bearing is 0.4 MPa.
Due to the limitation of the using conditions of the product, the thickness difference of the wall of the casting is large, the thermal junctions are dispersed, and meanwhile, the influence of the high-strength aluminum alloy material is caused, the sequential solidification of the casting is difficult to realize in the solidification process, and small-sized looseness and pinhole defects are easily generated at the wall thickness connection and the isolated thermal junctions of the casting. Such casting defects can cause leakage of the box casting during pressure testing after machining.
The product has higher use requirement, strict mechanical processing control, long processing time and high cost, and the condition that the casting is scrapped due to pressurizing leakage after processing is not allowed to occur, so the process method of the invention eliminates the pressurizing leakage defect of the box body by a leakage compensation mode, and strengthens the pressure-resistant quality of the aluminum alloy casting box body.
Disclosure of Invention
The invention aims to provide a process method for strengthening the pressure-resistant quality of aluminum alloy, which can improve the pressure-resistant quality of aluminum alloy castings by a treatment method for treating the pressure leakage of the aluminum alloy castings.
The technical scheme of the invention is as follows: a process method for strengthening the pressure-resistant quality of aluminum alloy is characterized by comprising the following steps:
1) compounding liquid for infusion
The formulation ratio of the patch liquid is, for example, as shown in table 1 below:
table 1 ingredient ratio (%)
2) After the casting is finished finely, adding a leakage repairing liquid into the casting; sealing each opening part of the casting by adopting a sealing plate, reserving 2 processing holes on the sealing plate at the upper part, respectively installing an air inlet pipe (5) with a valve and a pressure gauge (6), placing the casting on a test bed, and enabling the leakage position to be positioned at the deepest part of the liquid level;
compressed air is filled in the air inlet pipe (5) with a valve, so that the pressure of the inner cavity of the casting (1) reaches 0.48-0.50 MPa, the valve is closed, and the pressure is maintained for 1-2 hours; the sealing plate is dismantled, the residual leakage repairing liquid is cleaned,
3) putting the casting 1 into a heating furnace, and heating and cooling through a percolation heating curve: the patch heating curve is as follows:
the box body is heated to 50 ℃ from room temperature, the temperature is kept for 45 minutes, then the box body is heated to 100 ℃ at the speed of 100 ℃/h, the temperature is kept for 1 hour, then the box body is heated to 150 ℃ at the speed of 100 ℃/h, the temperature is kept for 1 hour, and finally the box body is air-cooled to room temperature.
The invention has the technical effects that:
in particular to a process method for filling an inorganic filling agent by positive pressure to repair the pressure resistance of an aluminum casting. The method is characterized in that a seepage and compensation liquid is prepared, the seepage and compensation liquid is gradually infiltrated into the internal porosity and the pinhole of the casting under the positive pressure condition, and the casting is heated, insulated and cooled in a segmented manner, so that a certain temperature gradient is always formed on the inner wall of the casting, the seepage and compensation effect of the casting is improved, the seepage and compensation liquid is finally condensed and solidified under the positive pressure, and the final pressurizing and seepage phenomena are prevented.
Drawings
FIG. 1 is a schematic view of the assembly of parts
FIG. 2 is a heating curve for infiltration
1-casting 2-sealing side plate 3-infusion liquid 4-sealing upper plate 5-air inlet pipe 6 with valve-core 7-test bench 8-leakage position
Detailed Description
The present invention is described in further detail below.
The invention relates to a process method for strengthening the pressure-resistant quality of aluminum alloy, which is characterized in that a permeation solution is prepared, the permeation solution is gradually permeated into the inner part of a casting to be loose and a pinhole under the positive pressure condition, and the casting is heated, insulated and cooled in sections, and the specific method comprises the following steps:
1. the formulation ratio of the patch liquid is, for example, as shown in table 1 below:
table 1 ingredient ratio (%)
The invention adopts the water glass as the matrix solution of the infusion solution, has the function of forming dehydrated silicic acid gel after heating and hardening, has higher bonding strength, water resistance and oil resistance, and can ensure that the infusion solution does not fall off or dissolve back. The glass fiber is used as a commonly used reinforcer for the composite material, can be tightly combined with the water glass in the dehydration heating process, improves the toughness of the reinforcer, releases the internal stress of the dehydrated silicic acid gel, and can prevent the reinforcer from generating cracks. The ferric oxide powder is used as a strengthening phase, and can fill the molecular gap of the dehydrated silicic acid gel, so that the density of the dehydrated silicic acid gel is improved, and the strengthening effect is enhanced. The water is used as a regulator, so that the viscosity and the density of the osmotic infusion can be regulated, and the osmotic effect is ensured.
Through multiple tests and grops, when the density of the infusion solution is 2.9g/cm3-3.2g/cm3The leakage compensation effect is best, and the pressure-resistant quality of the box body is highest. From the density of the patch, a patch mix ratio can be calculated as shown in table 1, for example.
2. Designing a percolation repair process scheme:
the invention adopts a normal high pressure infiltration process. The technical scheme is as follows: the assembly schematic diagram of the parts is shown in figure 1, after the casting 1 is finished by finish machining, a sealing side plate 2 is installed,
inside the infiltration liquid 3 that adds the right amount stirring, the sealed upper plate 4 of installation on foundry goods 1, reserve 2 processing holes on the sealed upper plate 4 for the intake pipe 5 and the manometer 6 of valve are taken in the installation, and the installation is accomplished the back, places foundry goods 1 on test bench 7, ensures that seepage position 8 is in the deepest of liquid level.
And (3) charging compressed air through the air inlet pipe 5 with the valve to ensure that the pressure of the inner cavity of the casting 1 reaches 0.48-0.50 MPa, closing the valve, and maintaining the pressure for 1-2 hours according to the leakage degree. And (3) removing the sealing upper plate 4, cleaning residual infiltration liquid, putting the casting 1 into a heating furnace, and heating and cooling according to an infiltration heating curve shown in the attached figure 2.
Percolation heating curve:
the box body is heated to 50 ℃ from room temperature, the temperature is kept for 45 minutes, then the box body is heated to 100 ℃ at the speed of 100 ℃/h, the temperature is kept for 1 hour, then the box body is heated to 150 ℃ at the speed of 100 ℃/h, the temperature is kept for 1 hour, and finally the box body is air-cooled to room temperature.
And after the completion, carrying out an air tightness test of 0.40MPa to detect the infiltration effect.
More detailed embodiments are as follows:
example 2
Mixing proportionally according to the composition requirement of the osmotic compensating solution, stirring to make it uniform and fully wet, and stirring time is not less than 1 hour.
The part assembly schematic diagram is shown in an attached drawing 1, after finishing of a casting 1, a sealing side plate 2 is installed, a proper amount of infiltration liquid 3 which is uniformly stirred is added, a sealing upper plate 4 is installed on the casting 1, 2 machining holes are reserved on the sealing upper plate 4 and used for installing an air inlet pipe 5 with a valve and a pressure gauge 6, after the installation is finished, the casting 1 is placed on a test bench 7, and the infiltration position 8 is guaranteed to be in the deepest position of a liquid level.
And (3) charging compressed air through the air inlet pipe 5 with the valve to ensure that the pressure of the inner cavity of the casting 1 reaches 0.48-0.50 MPa, closing the valve, and maintaining the pressure for 1-2 hours according to the leakage degree. Removing the upper sealing plate 4, cleaning residual infiltration liquid, and putting the casting 1 into a heating furnace according to the attached drawing 2: and heating and cooling the infiltration heating curve.
And after the completion, carrying out an air tightness test of 0.40MPa to detect the infiltration effect. If the leakage position 8 has leakage, repeating the steps, but not exceeding 3 times at most; and if the leakage does not occur, sequentially disassembling all the assembly parts to finish the leakage repairing operation.
Example 3
Take the case of a retarder penetration process.
The embodiment is as follows: the raw material of the infusion solution is 20-25 mu mFe in granularity2O3Mixing powder, 800-mesh glass fiber, water glass with the modulus M of 3.1-3.3 and industrial distilled water according to the component requirement of the infiltration liquid, stirring to ensure that the infiltration liquid is uniform and fully wetted, and stirring for 1 hour.
The part assembly schematic diagram is shown in an attached drawing 1, after finishing of a casting 1, a sealing side plate 2 is installed, a proper amount of infiltration liquid 3 which is uniformly stirred is added, a sealing upper plate 4 is installed on the casting 1, 2 processing holes are reserved on the sealing upper plate 4 and used for installing an air inlet pipe 5 with a valve and a pressure gauge 6, after the installation is finished, the casting 1 is placed on a test bench 7, and the infiltration position 8 is guaranteed to be in the deepest position of a liquid level.
And (3) charging compressed air through the air inlet pipe 5 with the valve to ensure that the pressure of the inner cavity of the casting 1 reaches 0.48-0.50 MPa, closing the valve, and maintaining the pressure for 1-2 hours according to the leakage degree. Removing the upper sealing plate 4, cleaning residual infiltration liquid, and putting the casting 1 into a heating furnace according to the attached drawing 2: and heating and cooling the infiltration heating curve.
And after the completion, carrying out an air tightness test of 0.40MPa to detect the infiltration effect. If the leakage position 8 has leakage, repeating the steps, but not exceeding 3 times at most; and if the leakage does not occur, sequentially disassembling all the assembly parts to finish the leakage repairing operation.
Claims (9)
1. A process method for strengthening the pressure-resistant quality of aluminum alloy is characterized by comprising the following steps:
1) compounding liquid for infusion
The formulation ratio of the patch liquid is, for example, as shown in table 1 below:
table 1 ingredient ratio (%)
2) After the casting is finished finely, adding a leakage repairing liquid into the casting; sealing each opening part of the casting by adopting a sealing plate, reserving 2 processing holes on the sealing plate at the upper part, respectively installing an air inlet pipe (5) with a valve and a pressure gauge (6), placing the casting on a test bed, and enabling the leakage position to be positioned at the deepest part of the liquid level;
compressed air is filled in the air inlet pipe (5) with a valve, so that the pressure of the inner cavity of the casting (1) reaches 0.48-0.50 MPa, the valve is closed, and the pressure is maintained for 1-2 hours; the sealing plate is dismantled, the residual leakage repairing liquid is cleaned,
3) putting the casting 1 into a heating furnace, and heating and cooling through a percolation heating curve: the patch heating curve is as follows:
the box body is heated to 50 ℃ from room temperature, the temperature is kept for 45 minutes, then the box body is heated to 100 ℃ at the speed of 100 ℃/h, the temperature is kept for 1 hour, then the box body is heated to 150 ℃ at the speed of 100 ℃/h, the temperature is kept for 1 hour, and finally the box body is air-cooled to room temperature.
2. A process for strengthening the pressure-resistant quality of aluminum alloy according to claim 1, wherein the bottom of the casting is sealed, the infiltration liquid is added into the casting, and the mouth of the upper part of the casting is sealed.
3. The process method for enhancing the pressure-resistant quality of the aluminum alloy as claimed in claim 1, wherein the compressed air is filled, the valve is closed, and the pressure is maintained for 2 hours.
4. The process method for enhancing the pressure-resistant quality of the aluminum alloy as claimed in claim 1, wherein the test bench is of a groove-shaped structure.
5. The process method for enhancing the pressure-resistant quality of the aluminum alloy as claimed in claim 1, wherein the components of the impregnation fluid are proportioned and mixed for not less than 1 hour.
6. A process for strengthening the pressure-resistant quality of aluminum alloy according to claim 1, wherein the steps are repeated up to 3 times.
7. The process method for enhancing the pressure-resistant quality of the aluminum alloy as claimed in claim 1, wherein the raw material of the infiltration liquid has a particle size of 20-25 μmFe2O3The powder, 800-mesh glass fiber, water glass with the modulus M of 3.1-3.3 and industrial distilled water are mixed according to the component requirement of the osmotic liquid.
8. The process method for enhancing the pressure-resistant quality of the aluminum alloy as claimed in claim 1, wherein the stirring time is 1 hour.
9. The process method for strengthening the pressure-resistant quality of the aluminum alloy according to claim 1, wherein after the steps are completed, a 0.40MPa air tightness test is carried out to detect the cast leakage repairing effect, and if leakage occurs at a leakage position, the steps are repeated for no more than 3 times at most; and if the leakage does not occur, completing the leakage repairing operation.
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Citations (7)
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|---|---|---|---|---|
| US4758295A (en) * | 1986-04-08 | 1988-07-19 | Shimizu Construction Co., Ltd. | Method of stopping leakage of water in concrete structure |
| CN87104363A (en) * | 1987-06-23 | 1988-08-31 | 国营吉林柴油机厂 | A kind of matching method of new infiltration liquid of casting parts |
| CN101011733A (en) * | 2007-02-01 | 2007-08-08 | 赵继成 | Cylinder jacket inorganic impregnant and method for processing cylinder jacket single-side impregnation by the same |
| CN103341615A (en) * | 2013-07-25 | 2013-10-09 | 江西铜业股份有限公司 | Box shell body aluminum casting infiltration leak-repairing method and system in pressurization mode |
| CN103394448A (en) * | 2013-07-31 | 2013-11-20 | 海门市柯成汽车零部件制造有限公司 | Dipping treatment process of metal casting |
| CN103785575A (en) * | 2014-01-27 | 2014-05-14 | 江苏徐航科技有限公司 | Whole vacuum negative pressure impregnation equipment and method for die casting type shell |
| CN105903937A (en) * | 2016-05-12 | 2016-08-31 | 安徽纯启动力机械有限公司 | Vacuum pressure infiltration treatment process for aluminum alloy castings |
-
2019
- 2019-12-23 CN CN201911336905.5A patent/CN111036889B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4758295A (en) * | 1986-04-08 | 1988-07-19 | Shimizu Construction Co., Ltd. | Method of stopping leakage of water in concrete structure |
| CN87104363A (en) * | 1987-06-23 | 1988-08-31 | 国营吉林柴油机厂 | A kind of matching method of new infiltration liquid of casting parts |
| CN101011733A (en) * | 2007-02-01 | 2007-08-08 | 赵继成 | Cylinder jacket inorganic impregnant and method for processing cylinder jacket single-side impregnation by the same |
| CN103341615A (en) * | 2013-07-25 | 2013-10-09 | 江西铜业股份有限公司 | Box shell body aluminum casting infiltration leak-repairing method and system in pressurization mode |
| CN103394448A (en) * | 2013-07-31 | 2013-11-20 | 海门市柯成汽车零部件制造有限公司 | Dipping treatment process of metal casting |
| CN103785575A (en) * | 2014-01-27 | 2014-05-14 | 江苏徐航科技有限公司 | Whole vacuum negative pressure impregnation equipment and method for die casting type shell |
| CN105903937A (en) * | 2016-05-12 | 2016-08-31 | 安徽纯启动力机械有限公司 | Vacuum pressure infiltration treatment process for aluminum alloy castings |
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| 金俊仁等: "浸渗剂及无机浸渗剂的应用", 《粘接》 * |
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