CN116984561A - Efficient preparation method of special pipe based on lost foam process - Google Patents
Efficient preparation method of special pipe based on lost foam process Download PDFInfo
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- CN116984561A CN116984561A CN202310910241.9A CN202310910241A CN116984561A CN 116984561 A CN116984561 A CN 116984561A CN 202310910241 A CN202310910241 A CN 202310910241A CN 116984561 A CN116984561 A CN 116984561A
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- Prior art keywords
- steel pipe
- lost foam
- sand box
- white mold
- foam process
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000006260 foam Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 96
- 239000010959 steel Substances 0.000 claims abstract description 96
- 235000002245 Penicillium camembertii Nutrition 0.000 claims abstract description 44
- 238000005187 foaming Methods 0.000 claims abstract description 44
- 244000035744 Hura crepitans Species 0.000 claims abstract description 36
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052742 iron Inorganic materials 0.000 claims abstract description 18
- 238000005056 compaction Methods 0.000 claims abstract description 16
- 239000011248 coating agent Substances 0.000 claims abstract description 13
- 238000000576 coating method Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000007781 pre-processing Methods 0.000 claims abstract description 10
- 239000003110 molding sand Substances 0.000 claims abstract description 7
- 238000005086 pumping Methods 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims description 21
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 10
- 238000011049 filling Methods 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 229910001018 Cast iron Inorganic materials 0.000 claims description 4
- 229910001060 Gray iron Inorganic materials 0.000 claims description 4
- 241001584785 Anavitrinella pampinaria Species 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 2
- 238000002955 isolation Methods 0.000 claims 1
- 238000003754 machining Methods 0.000 abstract description 2
- 238000005498 polishing Methods 0.000 abstract description 2
- 238000003466 welding Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 27
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000002791 soaking Methods 0.000 description 5
- 238000005868 electrolysis reaction Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- UHOVQNZJYSORNB-UHFFFAOYSA-N monobenzene Natural products C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- LGXVIGDEPROXKC-UHFFFAOYSA-N 1,1-dichloroethene Chemical group ClC(Cl)=C LGXVIGDEPROXKC-UHFFFAOYSA-N 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 208000032544 Cicatrix Diseases 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000013012 foaming technology Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 231100000241 scar Toxicity 0.000 description 1
- 230000037387 scars Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
-
- 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
-
- 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
- B22D27/08—Shaking, vibrating, or turning of moulds
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
Abstract
The invention relates to the technical field of steel pipe machining, in particular to a high-efficiency preparation method of a special pipe based on a lost foam process. Which comprises the following steps: producing a foaming white mold with the same external dimension as the special pipe by using a machine, and preprocessing the steel pipe; placing the steel pipe into an inner hole of the foaming white mold, and placing one end of a closed blind head of the steel pipe into one end of the closed blind head of the foaming white mold when placing the steel pipe; the outer surface of the foaming white mold is sprayed with the vanishing mold coating, then is dried and put into a vanishing mold sand box, the sand box is filled with molding sand, and an opening of the sand box is covered with an isolating material; placing the sand box into a compaction table, pumping air in the sand box by using a vacuum pump, pouring molten iron, standing, stopping vacuumizing and decompressing to finish preparation. The invention uses the lost foam process to finish the preparation, which can reduce unnecessary cost, and the special pipe prepared by the lost foam process has no welding line, thus no extra polishing step is needed, and the preparation yield of the special pipe is higher.
Description
Technical Field
The invention relates to the technical field of steel pipe machining, in particular to a high-efficiency preparation method of a special pipe based on a lost foam process.
Background
The steel pipe is widely used steel, is classified into two major categories of seamless steel pipes and welded steel pipes according to the production process, and is classified into three major categories of carbon steel pipes, stainless steel pipes and alloy steel pipes according to the material classification, and the steel pipe has multiple classifications and uses, can be applied to different industries and engineering projects, wherein the hollow steel pipe has good mechanical properties, and can meet the manufacturing requirements of various structural members.
The existing hollow steel pipe casting method mainly comprises the following three steps: firstly, rolling a steel belt into a pipe, and forming a hollow steel pipe at a welded seam; the second is formed by directly drilling a hole in the middle of the metal rod; the third is to use the metal bar after heating, make with specialized complete equipment, punch the hole with the punch first, then the reamer reams, then finish with the finishing machine, this is the most used manufacturing approach of seamless steel tube, however still need to polish the welded seam in the above-mentioned first method, the second method model slowly, easy to produce the waste product, the third method needs to go down the core, put many core clips in the cavity in order to guarantee the tube hole is not eccentric, and make core and clip cost very high, and very troublesome.
In order to be capable of mass production of hollow steel pipes without skin seams, a high-efficiency preparation method of special pipes based on lost foam technology is proposed.
Disclosure of Invention
The invention aims to provide a high-efficiency preparation method of a special pipe based on a lost foam process, so as to solve the problems in the background technology.
In order to achieve the above object, the present invention provides a method for efficiently preparing a dedicated pipe based on a lost foam process, comprising the steps of:
s1, producing a foaming white mold with the same external dimension as a required special pipe by using a machine, and preprocessing the steel pipe;
s2, placing the steel pipe into an inner hole of the foaming white mold, and placing one end of the closed blind head of the steel pipe into one end of the closed blind head of the foaming white mold when placing the steel pipe;
s3, spraying the lost foam coating on the outer surface of the foaming white mold, drying and putting the lost foam coating into a lost foam sand box, filling molding sand into the sand box, and covering an opening of the sand box with an isolating material;
s4, placing the sand box into a compaction table, pumping air in the sand box by using a vacuum pump, pouring molten iron, standing, stopping vacuumizing and decompressing to finish preparation.
As a further improvement of the technical scheme, in the step S1, the steel pipe is pretreated to remove oil and rust on the surface of the steel pipe, and the steel pipe is soaked in a solvent for 1.0-2.5h and then subjected to electrolytic rust removal.
As a further improvement of the technical scheme, in S1, the steel pipe is a seamed steel pipe or a seamless steel pipe.
As a further improvement of the technical scheme, in the step S2, the outer diameter of the steel pipe is the same as the inner hole size of the foaming white mold, the inner diameter of the steel pipe is the same as the inner hole size of the special pipe, and the foaming white mold and the steel pipe are both closed blind heads at one end and are of an opening structure at the other end.
As a further improvement of the technical scheme, in S3, the isolating material is decorative plastic cloth.
As a further improvement of the technical scheme, in the step S3, the drying temperature is 40-55 ℃, and the humidity during drying is 18-22% RH.
As a further improvement of the technical scheme, in S4, the molten iron is made of ordinary gray cast iron or alloy cast iron.
As a further improvement of the technical scheme, in the step S4, the vibration amplitude range of the compaction table in vibration is 1.2-2.0mm.
As a further improvement of the technical scheme, in the step S4, the standing time is 3-8min.
According to the invention, the foaming white mold with the consistent shape is produced according to the shape of the special pipe which is prepared according to the requirement, the steel pipe to be processed is placed in the foaming white mold, the lost foam process is utilized to finish the shaping of the steel pipe, and then the preparation of the special pipe is finished.
Compared with the prior art, the invention has the beneficial effects that:
in the efficient preparation method of the special pipe based on the lost foam process, the lost foam process is utilized to complete the preparation of the special pipe, a core clip and corresponding sand are not needed, unnecessary cost can be reduced, and the special pipe prepared by the lost foam process has no welding seam, so that no extra polishing step is needed, and the preparation yield of the special pipe is higher.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present embodiment aims to provide a method for efficiently preparing a dedicated pipe based on a lost foam process, which comprises the following steps:
s1, producing a foaming white mold with the same external dimensions as a special pipe required by a machine, preprocessing a steel pipe, wherein the steel pipe is a seamed steel pipe or a seamless steel pipe, the wall thickness of the steel pipe can be determined according to the requirement, heavy sand can be filled in the steel pipe or not, the steel pipe can be determined according to the actual situation, the steel pipe is preprocessed by degreasing and derusting the surface of the steel pipe, soaking the steel pipe in a solvent such as dichloroethylene, trichloroethylene, benzene, carbon tetrachloride, industrial alcohol, acetone and the like for 1.0-2.5 hours, and then carrying out electrolytic derusting;
s2, placing the steel pipe into an inner hole of a foaming white mold, placing one end of a closed blind head of the steel pipe into one end of the closed blind head of the foaming white mold during placing, wherein the outer diameter of the steel pipe is identical to the inner hole of the foaming white mold, the inner diameter of the steel pipe is identical to the inner hole of a special pipe required, the foaming white mold and the steel pipe are both provided with one end as the closed blind head, and the other end is provided with an opening structure;
s3, spraying the lost foam coating on the outer surface of the foaming white mold, drying and putting the lost foam coating into a lost foam sand box, filling molding sand into the sand box, and covering the opening of the sand box with an isolating material, wherein the drying temperature range is 40-55 ℃, the humidity range is 18-22% RH during drying, and cracks appear on the surface of the lost foam due to the fact that the drying temperature is too high;
s4, placing the sand box into a compaction table, pumping air in the sand box by using a vacuum pump to form negative pressure in the sand box, pouring molten iron, standing, stopping vacuumizing and decompressing to finish preparation, wherein the molten iron is made of common gray cast iron or various alloy cast irons, and can also be made of various materials of steel, the vibration amplitude range of the compaction table in vibration is 1.2-2.0mm, the compaction table can be used for compaction of materials, the air and gaps in the materials are reduced, and the standing time range is 3-8min after pouring molten iron.
According to the invention, the foaming white mold with the consistent shape is produced according to the shape of the special pipe which is prepared according to the requirement, the steel pipe to be processed is placed in the foaming white mold, the lost foam process is utilized to finish the shaping of the steel pipe, and then the preparation of the special pipe is finished.
The efficient preparation method of the special pipe based on the lost foam process provided by the invention is further described by the following specific examples according to the differences of process parameters in the process.
Example 1
S1, producing a foaming white mold with the same external dimension as a special pipe required by a machine, preprocessing a steel pipe, namely a seamed steel pipe or a seamless steel pipe, preprocessing the steel pipe to remove oil and rust on the surface of the steel pipe, soaking the steel pipe in a solvent for 1.0h, and then removing rust by electrolysis;
s2, placing the steel pipe into an inner hole of a foaming white mold, placing one end of a closed blind head of the steel pipe into one end of the closed blind head of the foaming white mold during placing, wherein the outer diameter of the steel pipe is identical to the inner hole of the foaming white mold, the inner diameter of the steel pipe is identical to the inner hole of a special pipe required, the foaming white mold and the steel pipe are both provided with one end as the closed blind head, and the other end is provided with an opening structure;
s3, spraying the lost foam coating on the outer surface of the foaming white mold, drying and putting the lost foam coating into a lost foam sand box, filling molding sand into the sand box, and covering the opening of the sand box with an isolating material, wherein the drying temperature is 55 ℃, and the humidity during drying is 18% RH;
s4, placing the sand box into a compaction table, pumping air in the sand box by using a vacuum pump, pouring molten iron, standing, stopping vacuumizing and decompressing to finish preparation, wherein the molten iron is made of alloy cast iron, the vibration amplitude of the compaction table in vibration is 2.0mm, and the standing time is 3min after pouring the molten iron.
Example 2
S1, producing a foaming white mold with the same external dimension as a special pipe required by a machine, preprocessing a steel pipe, namely a seamed steel pipe or a seamless steel pipe, preprocessing the steel pipe to remove oil and rust on the surface of the steel pipe, soaking the steel pipe in a solvent for 1.5h, and then removing rust by electrolysis;
s2, placing the steel pipe into an inner hole of a foaming white mold, placing one end of a closed blind head of the steel pipe into one end of the closed blind head of the foaming white mold during placing, wherein the outer diameter of the steel pipe is identical to the inner hole of the foaming white mold, the inner diameter of the steel pipe is identical to the inner hole of a special pipe required, the foaming white mold and the steel pipe are both provided with one end as the closed blind head, and the other end is provided with an opening structure;
s3, spraying the lost foam coating on the outer surface of the foaming white mold, drying and putting the lost foam coating into a lost foam sand box, filling molding sand into the sand box, and covering the opening of the sand box with an isolating material, wherein the drying temperature is 45 ℃, and the humidity during drying is 20% RH;
s4, placing the sand box into a compaction table, pumping air in the sand box by using a vacuum pump, pouring molten iron, standing, stopping vacuumizing and decompressing to finish preparation, wherein the molten iron is made of alloy cast iron, the vibration amplitude of the compaction table in vibration is 1.6mm, and the standing time is 5min after pouring the molten iron.
Example 3
S1, producing a foaming white mold with the same external dimension as a special pipe required by a machine, preprocessing a steel pipe, namely a seamed steel pipe or a seamless steel pipe, preprocessing the steel pipe to remove oil and rust on the surface of the steel pipe, soaking the steel pipe in a solvent for 2.5h, and then removing rust by electrolysis;
s2, placing the steel pipe into an inner hole of a foaming white mold, placing one end of a closed blind head of the steel pipe into one end of the closed blind head of the foaming white mold during placing, wherein the outer diameter of the steel pipe is identical to the inner hole of the foaming white mold, the inner diameter of the steel pipe is identical to the inner hole of a special pipe required, the foaming white mold and the steel pipe are both provided with one end as the closed blind head, and the other end is provided with an opening structure;
s3, spraying the lost foam coating on the outer surface of the foaming white mold, drying and putting the lost foam coating into a lost foam sand box, filling molding sand into the sand box, and covering the opening of the sand box with an isolating material, wherein the drying temperature is 40 ℃, and the humidity during drying is 22% RH;
s4, placing the sand box into a compaction table, pumping air in the sand box by using a vacuum pump, pouring molten iron, standing, stopping vacuumizing and decompressing to finish preparation, wherein the molten iron is made of common gray cast iron, the vibration amplitude of the compaction table in vibration is 1.2mm, and the standing time is 8min after pouring the molten iron.
Table 1 comparative process parameters in examples 1-3
Comparative example 1
The soaking time is set to 3.0h on the basis of the embodiment 1, the rest is unchanged, the specific steps are similar to the embodiment 1, and the description of the comparative example is omitted.
Table 2 comparison of process parameters for example 1 and comparative example 1
Comparative example 2
The comparative example is based on the example 2, the drying temperature is set to 80 ℃, the rest is unchanged, the specific steps are similar to the example 2, and the comparative example is not repeated.
Comparative example 3
The comparative example was based on example 2, the drying humidity was set to 25% rh, the rest was unchanged, and the specific procedure was similar to example 2, and the comparative example was not repeated.
Table 3 comparison of process parameters for example 2 and comparative examples 2-3
Comparative example 4
The vibration amplitude of the compaction table is set to be 1.0mm on the basis of the embodiment 3, the rest is unchanged, the specific steps are similar to the embodiment 3, and the description of the comparative example is omitted.
Comparative example 5
The comparative example is based on the embodiment 3, the standing time after pouring molten iron is set to 10min, the rest is unchanged, the specific steps are similar to the embodiment 3, and the comparative example is not repeated.
Table 4 comparison of the process parameters of example 3 and comparative examples 4-5
Test examples
The preparation of the dedicated pipe was performed according to the efficient preparation method of the dedicated pipe based on the lost foam process provided in examples 1 to 3 and comparative examples 1 to 5, respectively, and the average yield (yield is the number of finished pipes/total number of pipes prepared, and the standard of the finished pipes is that the pipe wall is flat and smooth, no defects such as obvious unevenness, cracks, bubbles, scars, etc.) was calculated and the result was filled in table 5.
Table 5 comparison of average yield of dedicated tubes for examples and comparative examples
| Average yield/% | |
| Example 1 | 97.5 |
| Example 2 | 97.8 |
| Example 3 | 97.4 |
| Comparative example 1 | 97.1 |
| Comparative example 2 | 97.1 |
| Comparative example 3 | 96.9 |
| Comparative example 4 | 97.0 |
| Comparative example 5 | 96.8 |
As can be seen from Table 5, the production yields of the dedicated pipes of examples 1 to 3 and comparative examples 1 to 5 were higher than those of the dedicated pipes of comparative examples, and were higher than 97.4%, while the production yields of the dedicated pipes treated with the comparative examples having different process parameters were reduced, so that the efficient production method of the dedicated pipes based on the lost foam process provided by the present invention had a higher yield.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The efficient preparation method of the special pipe based on the lost foam process is characterized by comprising the following steps of:
s1, producing a foaming white mold with the same external dimension as a required special pipe by using a machine, and preprocessing the steel pipe;
s2, placing the steel pipe into an inner hole of the foaming white mold, and placing one end of the closed blind head of the steel pipe into one end of the closed blind head of the foaming white mold when placing the steel pipe;
s3, spraying the lost foam coating on the outer surface of the foaming white mold, drying and putting the lost foam coating into a lost foam sand box, filling molding sand into the sand box, and covering an opening of the sand box with an isolating material;
s4, placing the sand box into a compaction table, pumping air in the sand box by using a vacuum pump, pouring molten iron, standing, stopping vacuumizing and decompressing to finish preparation.
2. The efficient preparation method of the special pipe based on the lost foam process according to claim 1, wherein the method comprises the following steps: in the step S1, the steel pipe is pretreated to remove oil and rust on the surface of the steel pipe, and the steel pipe is soaked in a solvent for 1.0-2.5h and then is subjected to electrolytic rust removal.
3. The efficient preparation method of the special pipe based on the lost foam process according to claim 1, wherein the method comprises the following steps: in the step S1, the steel pipe is a seamed steel pipe or a seamless steel pipe.
4. The efficient preparation method of the special pipe based on the lost foam process according to claim 1, wherein the method comprises the following steps: in the step S2, the outer diameter of the steel pipe is the same as the inner hole size of the foaming white mold, the inner diameter of the steel pipe is the same as the inner hole size of the required special pipe, the foaming white mold and the steel pipe are both closed blind heads at one end, and the other end is of an opening structure.
5. The efficient preparation method of the special pipe based on the lost foam process according to claim 1, wherein the method comprises the following steps: in the step S3, the isolation material is decorative plastic cloth.
6. The efficient preparation method of the special pipe based on the lost foam process according to claim 1, wherein the method comprises the following steps: in the step S3, the drying temperature is 40-55 ℃, and the humidity is 18-22% RH during drying.
7. The efficient preparation method of the special pipe based on the lost foam process according to claim 1, wherein the method comprises the following steps: in the step S4, the molten iron is made of common gray cast iron or alloy cast iron.
8. The efficient preparation method of the special pipe based on the lost foam process according to claim 1, wherein the method comprises the following steps: in the step S4, the vibration amplitude range of the compaction table in vibration is 1.2-2.0mm.
9. The efficient preparation method of the special pipe based on the lost foam process according to claim 1, wherein the method comprises the following steps: in the step S4, the standing time ranges from 3min to 8min.
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| CN1759957A (en) * | 2005-10-27 | 2006-04-19 | 西安建筑科技大学 | Technique for manufacturing wearable pipe made from composite bimetal |
| CN101912948A (en) * | 2010-08-24 | 2010-12-15 | 新兴铸管股份有限公司 | Method for manufacturing corrosion-resistant double-metal pipe by expendable pattern shell molding process |
| CN103008544A (en) * | 2012-12-06 | 2013-04-03 | 华中科技大学 | Bi-metal bent pipe manufacturing process based on evaporative pattern casting and vibration pouring |
| CN103418747A (en) * | 2013-08-25 | 2013-12-04 | 阳城县华王通用离心铸管厂 | Lost foam casting process for double-bell-and-spigot grey cast iron thin wall pipe fittings and sand box for process |
| CN107282886A (en) * | 2016-04-05 | 2017-10-24 | 福建聚能机械制造有限公司 | A kind of aluminium alloy lost foam casting technique of built-in spiral coil water channel |
| CN111112580A (en) * | 2020-01-13 | 2020-05-08 | 芜湖泓鹄材料技术有限公司 | Forming method of heat dissipation channel of automobile stamping die casting |
| CN114309461A (en) * | 2021-12-21 | 2022-04-12 | 江苏紫金动力股份有限公司 | Lost foam production method of engine cylinder sleeve |
| CN116460249A (en) * | 2023-04-19 | 2023-07-21 | 卓然(靖江)设备制造有限公司 | Production method of composite cast stone pipe fitting |
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