CN111054891A - Precision casting method of novel ship jet pump - Google Patents
Precision casting method of novel ship jet pump Download PDFInfo
- Publication number
- CN111054891A CN111054891A CN201911412522.1A CN201911412522A CN111054891A CN 111054891 A CN111054891 A CN 111054891A CN 201911412522 A CN201911412522 A CN 201911412522A CN 111054891 A CN111054891 A CN 111054891A
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- Prior art keywords
- casting
- wax
- jet pump
- precision casting
- slurry
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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
- 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
- B22C9/22—Moulds for peculiarly-shaped castings
-
- 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
Abstract
The invention discloses a precision casting method of a novel ship jet pump, which comprises the following steps of (1) designing technological parameters; (2) wax pressing, correcting and tree assembling; (3) preparing a shell; (4) dewaxing; (5) roasting; (6) casting; (7) shelling; (8) sand blasting, shot blasting, correcting and acid washing; the invention introduces a relatively mature precision casting process into the manufacture of the parts of the jet pump of the ship, so that the size of the casting is closer to the final size of the drawing, the surface smoothness is good, the parts are attractive, the turning process is hardly needed, the time and the labor are saved, and the yield is high. The precision casting adopted by the invention can cast the holes of the pump body flange together, and the holes do not need to be punched in the later period, thereby reducing the workload; meanwhile, the surface of the cast inner hole of the pump body is smooth, reprocessing is not needed, and the processing workload is reduced.
Description
Technical Field
The invention relates to the technical field of pump casting, in particular to a precision casting method of a novel ship jet pump.
Background
Jet pumps for ships and boats are equipment which must be used by every ship, and copper or iron materials are used for a long time for production by sand casting. At present, the marine pump parts are cast in a common sand mold mode, a mold adopts a wood mold or an aluminum mold, the surface of a casting is rough, the allowance is large because of large dimensional error of the casting, the number of processing surfaces is large, time and labor are consumed, casting defects are easily generated due to the backward process, the yield is low, and the loss is large.
Meanwhile, the existing jet pump for ships and ships is produced by adopting a method of sand casting copper or iron to obtain a product blank, and the method has the defects that: low finished product rate, rough surface and large processing allowance.
Therefore, the technical problem to be solved by technical personnel in the field is urgently needed to provide a novel precision casting method of the ship jet pump, which is time-saving, labor-saving, high in yield, good in product surface smoothness and attractive.
Disclosure of Invention
In view of the above, the invention introduces a relatively mature precision casting process into the manufacture of the water pump parts, so that the size of the casting is closer to the final size of the drawing, the surface smoothness is good, the parts are attractive, the turning process is hardly needed, the time and the labor are saved, and the yield is high.
In order to achieve the purpose, the invention adopts the following technical scheme:
the novel precision casting method of the jet pump of the ship comprises the following steps:
(1) designing technological parameters: analyzing the structural characteristics of the casting, judging the defect tendency, and cutting allowance to obtain the position of the sprue;
(2) wax pressing: manufacturing a wax mould by using a wax pressing machine, correcting the wax mould, and assembling the wax mould into a tree;
(3) preparing a shell: dipping the assembled wax pattern into the slurry for slurry dipping, immediately spraying sand after dipping the wax pattern into the slurry, dipping the wax pattern into the slurry again for slurry dipping after drying, and naturally drying the wax pattern;
(4) dewaxing: dewaxing the air-dried wax mold under the steam fumigation condition to form a casting mold;
(5) roasting: placing the casting mould into a roasting furnace for roasting and heating until the temperature is the same as that of molten stainless steel;
(6) casting: putting the stainless steel ingot into a melting furnace for melting, then injecting molten stainless steel liquid into a roasted casting mold, filling the molten stainless steel into the casting mold by utilizing gravity, and moving the casting mold to a cooling chamber for natural cooling;
(7) shelling: carrying out vibration shelling treatment on the casting, cutting the allowance, carrying out surface treatment by using a grinding machine, and simultaneously cutting and polishing the pouring gate;
(8) and (3) post-treatment: and (5) sequentially carrying out sand blasting, shot blasting, correction and acid pickling on the casting polished in the step (7) to obtain the jet pump precision casting.
Compared with the prior art, the invention has the beneficial effects that: the stainless steel pump body produced by the invention is subjected to surface treatment in a foundry, so that surface paint is not required to be applied in the later period, and the air pollution is reduced. The precision casting adopted by the invention can cast the holes of the pump body flange together, and the holes do not need to be punched in the later period, thereby reducing the workload; meanwhile, the surface of the cast inner hole of the pump body is smooth, so that reprocessing is not needed, and the processing workload is reduced. The corrosion resistance of the duplex stainless steel material selected by the invention is superior to that of the traditional copper casting, and particularly, the corrosion resistance of the raw material adopted by the invention is better in seawater corrosion resistance. The cast stainless steel pump body is easy to repair when casting defects occur, and meanwhile, the stainless steel used as a casting material has good compactness and is not easy to seep water.
Further, the temperature of the wax pressing machine in the step (2) is 50-60 ℃, and the wax pressing pressure is 5-15kg/cm2。
Adopt above-mentioned further beneficial effect to lie in: the sub-drawing parameters adopted by the invention can improve the forming rate of the wax mould, thereby improving the casting yield of the jet pump.
Further, the slurry in the step (3) is silica sol.
Adopt above-mentioned further beneficial effect to lie in: the slurry adopted by the invention can fully protect the wax mould during casting, thereby improving the yield of the jet pump.
Further, the steam temperature in the step (4) is 110-.
Further, the adding amount of the stainless steel ingot in the step (6) is 20-30 kg.
Adopt above-mentioned further beneficial effect to lie in: the invention reduces the raw material consumption of the jet pump, and the novel jet pump with extremely long service life can be prepared by adopting less stainless steel ingots.
Further, the vibration frequency of the vibratory shelling in the step (7) is 20-30 kHz.
Further, in the step (8), a press-in dry sand blasting machine is adopted for sand blasting, and quartz sand is adopted as a blasting material for sand blasting.
Furthermore, the acid washing operation method in the step (8) is leaching or dipping, and the adopted acid is hydrochloric acid.
Preferably, the concentration of the acid is 0.2 to 0.5 mol/L.
Adopt above-mentioned further beneficial effect to lie in: the invention carries out sand blasting on the cast jet pump and simultaneously carries out acid washing, so that the surface of the jet pump is cleaner and the impurities in the jet pump can be removed, the electrochemical reaction is prevented, and the service life of the jet pump is further prolonged.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Precision casting method of novel ship jet pump
(1) Designing technological parameters: analyzing the structural characteristics of the casting, judging the defect tendency, and cutting allowance to obtain the position of the sprue;
(2) wax pressing: at 50 ℃ under a pressure of 15kg/cm2Manufacturing a wax mould by using a wax pressing machine under the condition of wax pressing, correcting the wax mould, and assembling the wax mould into a tree;
(3) preparing a shell: dipping the assembled wax pattern into the slurry for slurry dipping, immediately spraying sand after dipping the wax pattern into the slurry, dipping the wax pattern into the slurry again for slurry dipping after drying, and naturally drying the wax pattern, wherein the slurry is silica sol;
(4) dewaxing: dewaxing the air-dried wax mold under the steam fumigation condition of 110 ℃ to form a casting mold;
(5) roasting: placing the casting mould into a roasting furnace for roasting and heating until the temperature is the same as that of molten stainless steel;
(6) casting: putting 30kg of stainless steel ingots into a melting furnace for melting, then injecting molten stainless steel liquid into a roasted casting mold, filling the molten stainless steel into the casting mold by using gravity, and moving the casting mold to a cooling chamber for natural cooling;
(7) shelling: carrying out vibration shelling treatment on the casting at 20kHz, cutting the allowance, carrying out surface treatment by using a grinding machine, and simultaneously cutting and polishing the pouring gate;
(8) and (3) post-treatment: and (4) taking quartz sand as a blasting material, blasting sand by using a press-in dry sand blasting machine, performing shot blasting and correction, and performing pickling treatment by using hydrochloric acid with the concentration of 0.5mol/L to obtain the precise casting of the jet pump.
Example 2
Precision casting method of novel ship jet pump
(1) Designing technological parameters: analyzing the structural characteristics of the casting, judging the defect tendency, and cutting allowance to obtain the position of the sprue;
(2) wax pressing: at 60 ℃ and 5kg/cm2Manufacturing a wax mould by using a wax pressing machine under the condition of wax pressing, correcting the wax mould, and assembling the wax mould into a tree;
(3) preparing a shell: dipping the assembled wax pattern into the slurry for slurry dipping, immediately spraying sand after dipping the wax pattern into the slurry, dipping the wax pattern into the slurry again for slurry dipping after drying, and naturally drying the wax pattern, wherein the slurry is silica sol;
(4) dewaxing: dewaxing the air-dried wax mold under the steam fumigation condition of 130 ℃ to form a casting mold;
(5) roasting: placing the casting mould into a roasting furnace for roasting and heating until the temperature is the same as that of molten stainless steel;
(6) casting: putting 20kg of stainless steel ingot into a melting furnace for melting, then injecting molten stainless steel liquid into a roasted casting mold, filling the molten stainless steel into the casting mold by using gravity, and moving the casting mold to a cooling chamber for natural cooling;
(7) shelling: carrying out vibration shelling treatment on the casting at 30kHz, cutting the allowance, carrying out surface treatment by using a grinding machine, and simultaneously cutting and polishing the pouring gate;
(8) and (3) post-treatment: and (4) taking quartz sand as a blasting material, blasting sand by using a press-in dry sand blasting machine, performing shot blasting and correction, and performing spray pickling treatment by using hydrochloric acid with the concentration of 0.2mol/L to obtain the precise casting of the jet pump.
Example 3
Precision casting method of novel ship jet pump
(1) Designing technological parameters: analyzing the structural characteristics of the casting, judging the defect tendency, and cutting allowance to obtain the position of the sprue;
(2) wax pressing: at 55 deg.C, 10kg/cm2Manufacturing a wax mould by using a wax pressing machine under the condition of wax pressing, correcting the wax mould, and assembling the wax mould into a tree;
(3) preparing a shell: dipping the assembled wax pattern into the slurry for slurry dipping, immediately spraying sand after dipping the wax pattern into the slurry, dipping the wax pattern into the slurry again for slurry dipping after drying, and naturally drying the wax pattern, wherein the slurry is silica sol;
(4) dewaxing: dewaxing the air-dried wax mold under the steam fumigation condition of 120 ℃ to form a casting mold;
(5) roasting: placing the casting mould into a roasting furnace for roasting and heating until the temperature is the same as that of molten stainless steel;
(6) casting: putting 25kg of stainless steel ingot into a melting furnace for melting, then injecting molten stainless steel liquid into a roasted casting mold, filling the molten stainless steel into the casting mold by using gravity, and moving the casting mold to a cooling chamber for natural cooling;
(7) shelling: carrying out vibration shelling treatment on the casting at 25kHz, cutting the allowance, carrying out surface treatment by using a grinding machine, and simultaneously cutting and polishing the pouring gate;
(8) and (3) post-treatment: and (4) taking quartz sand as a blasting material, blasting sand by using a press-in dry sand blasting machine, performing shot blasting and correction, and performing pickling treatment by using hydrochloric acid with the concentration of 0.3mol/L to obtain the precise casting of the jet pump.
Example 4
Precision casting method of novel ship jet pump
(1) Designing technological parameters: analyzing the structural characteristics of the casting, judging the defect tendency, and cutting allowance to obtain the position of the sprue;
(2) wax pressing: at 58 ℃ under a pressure of 12kg/cm2Manufacturing a wax mould by using a wax pressing machine under the condition of wax pressing, correcting the wax mould, and assembling the wax mould into a tree;
(3) preparing a shell: dipping the assembled wax pattern into the slurry for slurry dipping, immediately spraying sand after dipping the wax pattern into the slurry, dipping the wax pattern into the slurry again for slurry dipping after drying, and naturally drying the wax pattern, wherein the slurry is silica sol;
(4) dewaxing: dewaxing the air-dried wax mold under the steam fumigation condition of 115 ℃ to form a casting mold;
(5) roasting: placing the casting mould into a roasting furnace for roasting and heating until the temperature is the same as that of molten stainless steel;
(6) casting: putting 22kg of stainless steel ingots into a melting furnace for melting, then injecting molten stainless steel liquid into a roasted casting mold, filling the molten stainless steel into the casting mold by using gravity, and moving the casting mold to a cooling chamber for natural cooling;
(7) shelling: carrying out vibration shelling treatment on the casting at 26kHz, cutting the allowance, carrying out surface treatment by using a grinding machine, and simultaneously cutting and polishing the pouring gate;
(8) and (3) post-treatment: and (4) taking quartz sand as a blasting material, blasting sand by using a press-in dry sand blasting machine, performing shot blasting and correction, and performing pickling treatment by using hydrochloric acid with the concentration of 0.4mol/L to obtain the precise casting of the jet pump.
Example 5
Precision casting method of novel ship jet pump
(1) Designing technological parameters: analyzing the structural characteristics of the casting, judging the defect tendency, and cutting allowance to obtain the position of the sprue;
(2) wax pressing: at 50 ℃ under 10kg/cm2Manufacturing a wax mould by using a wax pressing machine under the condition of wax pressing, correcting the wax mould, and assembling the wax mould into a tree;
(3) preparing a shell: dipping the assembled wax pattern into the slurry for slurry dipping, immediately spraying sand after dipping the wax pattern into the slurry, dipping the wax pattern into the slurry again for slurry dipping after drying, and naturally drying the wax pattern, wherein the slurry is silica sol;
(4) dewaxing: dewaxing the air-dried wax mold under the steam fumigation condition of 125 ℃ to form a casting mold;
(5) roasting: placing the casting mould into a roasting furnace for roasting and heating until the temperature is the same as that of molten stainless steel;
(6) casting: putting 30kg of stainless steel ingots into a melting furnace for melting, then injecting molten stainless steel liquid into a roasted casting mold, filling the molten stainless steel into the casting mold by using gravity, and moving the casting mold to a cooling chamber for natural cooling;
(7) shelling: carrying out vibration shelling treatment on the casting at 25kHz, cutting the allowance, carrying out surface treatment by using a grinding machine, and simultaneously cutting and polishing the pouring gate;
(8) and (3) post-treatment: and (4) taking quartz sand as a blasting material, blasting sand by using a press-in dry sand blasting machine, performing shot blasting and correction, and performing spray pickling treatment by using hydrochloric acid with the concentration of 0.5mol/L to obtain the precise casting of the jet pump.
Test example 1
The precision casting methods of the novel vessel jet pump according to the embodiments 1-5 of the invention are respectively carried out 500 times of casting, and the casting results are shown in the table 1.
Table 1 examples 1-5 casting results 500 times
| Item | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Number of finished products | 492 | 485 | 490 | 493 | 488 |
| Number of defective products | 5 | 8 | 8 | 2 | 4 |
| Number of failures | 3 | 7 | 2 | 5 | 8 |
| Yield (%) | 98.4 | 97.0 | 98.0 | 98.6 | 97.6 |
Test example 2
The finished product of the novel jet pump for ships prepared in the examples 1 to 5 is subjected to an aging test, specifically, the jet pump is soaked in seawater at 40 ℃ for 24 months, and meanwhile, a common jet pump is adopted for comparison.
TABLE 2 results of aging test
| Item | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example |
| Characterization of | No corrosion | No corrosion | No corrosion | No corrosion | No corrosion | Severe rusting |
Claims (9)
1. A precision casting method of a novel ship jet pump is characterized by comprising the following steps:
(1) designing technological parameters: analyzing the structural characteristics of the casting, judging the defect tendency, and cutting allowance to obtain the position of the sprue;
(2) wax pressing: manufacturing a wax mould by using a wax pressing machine, correcting the wax mould, and assembling the wax mould into a tree;
(3) preparing a shell: dipping the assembled wax pattern into the slurry for slurry dipping, immediately spraying sand after dipping the wax pattern into the slurry, dipping the wax pattern into the slurry again for slurry dipping after drying, and naturally drying the wax pattern;
(4) dewaxing: dewaxing the air-dried wax mold under the steam fumigation condition to form a casting mold;
(5) roasting: placing the casting mould into a roasting furnace for roasting and heating until the temperature is the same as that of molten stainless steel; then, performing spectrum printing;
(6) casting: putting the stainless steel ingot into a melting furnace for melting, then injecting molten stainless steel liquid into a roasted casting mold, filling the molten stainless steel into the casting mold by utilizing gravity, and moving the casting mold to a cooling chamber for natural cooling;
(7) shelling: carrying out vibration shelling treatment on the casting, cutting the allowance, carrying out surface treatment by using a grinding machine, and simultaneously cutting and polishing the pouring gate;
(8) and (3) post-treatment: and (5) sequentially carrying out sand blasting, shot blasting, correction and acid pickling on the casting polished in the step (7) to obtain the jet pump precision casting.
2. The precision casting method of the novel ship jet pump as claimed in claim 1, wherein the temperature of the wax pressing machine in the step (2) is 50-60 ℃, and the wax pressing pressure is 5-15kg/cm2。
3. The precision casting method of the novel ship jet pump according to claim 1, wherein the slurry in the step (3) is silica sol.
4. The precision casting method for the novel ship jet pump as claimed in claim 1, wherein the steam temperature in the step (4) is 110-130 ℃.
5. The precision casting method of the novel jet pump for the ships according to claim 1, wherein the addition amount of the stainless steel ingot in the step (6) is 20-30 kg.
6. The precision casting method of the novel jet pump for the ships and warships according to claim 1, wherein the vibration frequency of the vibratory shelling in step (7) is 20-30 kHz.
7. The precision casting method of the novel ship jet pump according to claim 1, characterized in that in the step (8), the sand blasting is performed by a press-in dry sand blasting machine, and the blasting material used for sand blasting is quartz sand.
8. The precision casting method of the novel jet pump for the ships according to claim 1, characterized in that the pickling operation in step (8) is leaching or dipping, and the adopted acid is hydrochloric acid.
9. The precision casting method of the novel ship jet pump according to claim 8, wherein the concentration of the acid is 0.2-0.5 mol/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911412522.1A CN111054891A (en) | 2019-12-31 | 2019-12-31 | Precision casting method of novel ship jet pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911412522.1A CN111054891A (en) | 2019-12-31 | 2019-12-31 | Precision casting method of novel ship jet pump |
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| CN111054891A true CN111054891A (en) | 2020-04-24 |
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| CN201911412522.1A Pending CN111054891A (en) | 2019-12-31 | 2019-12-31 | Precision casting method of novel ship jet pump |
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| CN101922011A (en) * | 2010-08-06 | 2010-12-22 | 东北大学 | Pickling method of surface of 430 stainless steel |
| CN104554619A (en) * | 2014-11-28 | 2015-04-29 | 南通明德重工有限公司 | Technique for processing ballast tank duplex stainless steel surface of stainless steel category II chemical tanker |
| CN105970047A (en) * | 2016-06-29 | 2016-09-28 | 贵州华科铝材料工程技术研究有限公司 | Aluminum alloy material for replacing QT500 agricultural machinery speed reducer and investment casting method thereof |
| CN108889906A (en) * | 2018-07-06 | 2018-11-27 | 天津千鑫有色金属制品有限公司 | A kind of casting method of car brake pump aluminium alloy castings |
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2019
- 2019-12-31 CN CN201911412522.1A patent/CN111054891A/en active Pending
Patent Citations (5)
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|---|---|---|---|---|
| CN101922011A (en) * | 2010-08-06 | 2010-12-22 | 东北大学 | Pickling method of surface of 430 stainless steel |
| CN104554619A (en) * | 2014-11-28 | 2015-04-29 | 南通明德重工有限公司 | Technique for processing ballast tank duplex stainless steel surface of stainless steel category II chemical tanker |
| CN105970047A (en) * | 2016-06-29 | 2016-09-28 | 贵州华科铝材料工程技术研究有限公司 | Aluminum alloy material for replacing QT500 agricultural machinery speed reducer and investment casting method thereof |
| CN108889906A (en) * | 2018-07-06 | 2018-11-27 | 天津千鑫有色金属制品有限公司 | A kind of casting method of car brake pump aluminium alloy castings |
| CN108950575A (en) * | 2018-09-04 | 2018-12-07 | 合肥久新不锈钢厨具有限公司 | A kind of preparation process of anti-bacteria stainless steel |
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Application publication date: 20200424 |