CN102921889A - Precision investment casting casing-making method suitable for stainless steel casting - Google Patents
Precision investment casting casing-making method suitable for stainless steel casting Download PDFInfo
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Abstract
The invention discloses a precision investment casting casing-making method suitable for a stainless steel casting. The precision investment casting casing-making method comprises blending of an adhesion agent; preparation of surface layer slurry; surface layer stuccoing; preparation of transition layer slurry; transition layer stuccoing; preparation of reinforcing layer slurry; reinforcing layer stuccoing; preparation of obturating layer slurry; and drying of an obturating layer. Kaoline powder cheap in price is adopted mainly and is convenient to purchase, a preparation process and proportioning are simple, the aim of effectively reducing production cost in aluminum alloy precision investment casting is achieved on the premises that quality of a formwork and the surface of the casting is not reduced, quality of the casting is effectively improved, and production efficiency and the finished product rate of the casting are improved.
Description
Technical field
The present invention relates to the model casting technology, shell side method processed in a kind of precision-investment casting process particularly is particularly useful for the preparation method to the high stainless cast steel part of dimensional accuracy and surface requirements.
Background technology
The fields such as space flight, aviation, navigation, communication are more and more higher to the requirement of product technology performance, and a lot of complicated structural members are difficult to obtain with additive method.And casting can be good at realizing this point as a kind of special method.And precision-investment casting method has advantageous advantage to production especially some surface quality and the strict complex structural member of dimension precision requirement.Both at home and abroad precision-investment casting method mainly is the foundry goods manufacturing for light metal alloys such as some magnesium alloys, aluminium alloys, and has obtained very large achievement, and the work of still carrying out for the hot investment casting of the high heavy metal of ask for something such as stainless cast steel part is few.
Affect in the precision-investment casting surface quality of continuous castings and dimensional accuracy factor except the quality of wax-pattern, the selection of process for making shell also is vital technology.Present stage, mainly adopt zirconium English powder and upper shop sand as the formwork material both at home and abroad, but because zirconium English powder is expensive, for batch production, cost is very large.So, all actively seeking better technique and material, on the basis of the performance requirement that satisfies final casting, reduce the use amount of zirconium English powder, reduce cost.
Summary of the invention
The object of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of investment pattern precise casting shell-making method that is applicable to stainless cast steel part is provided, the method adopts the cheaper upper shop powder of price, buying is convenient, proportioning is simple, under the prerequisite that does not reduce formwork and surface quality of continuous castings, reduces the production cost of aluminium alloy precision-investment casting, improve casting quality, enhance productivity and casting yield.
The objective of the invention is to solve by the following technical programs:
This investment pattern precise casting shell-making method that is applicable to stainless cast steel part may further comprise the steps:
1) allotment of binding agent: be that 9～11 GRJ-30 type Ludox mixes by the weight ratio of 10:1 with distilled water or pure water with the pH value scope, fully stir and obtain binding agent;
2) the surface layer Pulp preparation is poured ready binding agent in the DXPJ quick mixer into, adds while stirring upper shop powder, first high-speed stirred 15 minutes; Then use stirring at low speed speed to stir at least again 45 minutes, measure respectively fast penetrant T and defoamer, and after the industrial alcohol dilution of adding with weight, add the surface layer slip; Stopping to stir rear slip measurement proportion is 2.9, and slurry viscosity is 35.
3) the surface layer stucco adopts that shop sand carries out the surface layer stucco on 70 purposes, and drying time, 10h did 1 layer of the number of plies certainly; Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%;
4) preparation of transition zone slurry and step 2) identical, but upper shop powder is 200#, and it is 1.8 that slip is measured proportion, and slurry viscosity is 22;
5) the transition zone stucco adopts that shop sand carries out the surface layer stucco on 35 purposes, and drying time, 8h did certainly, 2 layers of the numbers of plies, and environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%;
6) preparation of back-up coat slurry and step 2) identical, but slip measurement proportion is 1.7, slurry viscosity is 20;
7) the back-up coat stucco adopts that shop sand carries out the surface layer stucco on 22 purposes, drying time 8h, wind is dry, 3 layers of the numbers of plies; Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%;
8) the obturage preparation of layer slurry and a step 2) identical, but slip measurement proportion is 1.75, slurry viscosity is 22;
9) layer dry drying time of the 12h that obturages, wind is dry, 1 layer of the number of plies; Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%.
Further, above-mentioned steps 2) in, the shop powder of adding 280#～300#, according to the weight ratio meter, the ratio of Ludox and upper shop powder is 1:3.3; Described fast penetrant T accounts for 0.2% of Ludox weight; Described defoamer accounts for 0.2% of Ludox weight; Add industrial alcohol and account for 0.2% of Ludox weight.
The present invention has following beneficial effect:
The present invention mainly adopts the cheaper upper shop powder of price, buying is convenient, preparation technology is succinct, proportioning is easy, can reach under the prerequisite that does not reduce formwork and surface quality of continuous castings, effectively reduce the purpose of aluminium alloy precision-investment casting production cost, effectively improved the quality of foundry goods, improved production efficiency and casting yield.
The specific embodiment
The present invention is applicable to the investment pattern precise casting shell-making method of stainless cast steel part, comprises successively surface layer, transition zone, back-up coat, the preparation of obturaging layer, specifically carries out according to following steps:
1) allotment of binding agent: be that 9～11 GRJ-30 type Ludox mixes by the weight ratio of 10:1 with distilled water or pure water with the pH value scope, fully stir and obtain binding agent;
2) the surface layer Pulp preparation is poured ready binding agent in the DXPJ quick mixer into, adds while stirring upper shop powder, first high-speed stirred 15 minutes; Then use stirring at low speed speed to stir at least again 45 minutes, measure respectively fast penetrant T and defoamer, and after the industrial alcohol dilution of adding with weight, add the surface layer slip; Stopping to stir rear slip measurement proportion is 2.9, and slurry viscosity is 35.Wherein going up the shop powder is 280#～300#, and according to the weight ratio meter, the ratio of Ludox and upper shop powder is 1:3.3; Fast penetrant T accounts for 0.2% of Ludox weight; Defoamer accounts for 0.2% of Ludox weight; Add industrial alcohol and account for 0.2% of Ludox weight.
3) the surface layer stucco adopts that shop sand carries out the surface layer stucco on 70 purposes, and drying time, 10h did 1 layer of the number of plies certainly; Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%;
4) preparation of transition zone slurry and step 2) identical, but upper shop powder is 200#, and it is 1.8 that slip is measured proportion, and slurry viscosity is 22;
5) the transition zone stucco adopts that shop sand carries out the surface layer stucco on 35 purposes, and drying time, 8h did certainly, 2 layers of the numbers of plies, and environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%;
6) preparation of back-up coat slurry and step 2) identical, but slip measurement proportion is 1.7, slurry viscosity is 20;
7) the back-up coat stucco adopts that shop sand carries out the surface layer stucco on 22 purposes, drying time 8h, wind is dry, 3 layers of the numbers of plies; Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%;
8) the obturage preparation of layer slurry and a step 2) identical, but slip measurement proportion is 1.75, slurry viscosity is 22;
9) layer dry drying time of the 12h that obturages, wind is dry, 1 layer of the number of plies; Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%.
Below by specific embodiment the present invention is done and to describe in further detail:
Embodiment 1
1) allotment of binding agent be 9～11 GRJ-30 type Ludox with the pH value scope with distilled water in 10:1 ratio mix, just can carry out the slip configuration after fully stirring.
2) the surface layer Pulp preparation is poured ready binding agent in the DXPJ quick mixer in right amount, adds while stirring shop powder (280#～300#), first high-speed stirred 15 minutes.Splash if any slip and can suitably reduce rotating speed.Then use stirring at low speed speed to stir at least again 45 minutes, measure respectively fast penetrant T (account for Ludox weight 0.2%) and defoamer (account for Ludox weight 0.2%), and after adding industrial alcohol dilution with volume, add the surface layer slip.Stopping to stir rear slip measurement proportion is 2.9, and slurry viscosity is 35.
3) the surface layer stucco adopts that shop sand carries out the surface layer stucco on 70 purposes, and drying time, 10h did 1 layer of the number of plies certainly.Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%.
4) preparation of transition zone slurry and step 2) identical, but upper shop powder is 200#, but slurry proportion is 1.8, slurry viscosity is 22.
5) the transition zone stucco adopts that shop sand carries out the surface layer stucco on 35 purposes, and drying time, 8h did 2 layers of the numbers of plies certainly.Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%.
6) preparation of back-up coat slurry and the 4th identical step.But slurry proportion is 1.7, and slurry viscosity is 20.
7) the back-up coat stucco adopts that shop sand carries out the surface layer stucco on 22 purposes, drying time 8h, wind is dry, 3 layers of the numbers of plies.Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%.
8) the obturage preparation of layer slurry and step 2) identical.But slurry proportion is 1.75, and slurry viscosity is 22.
9) layer dry drying time of the 12h that obturages, wind is dry, 1 layer of the number of plies.Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%.
Embodiment 2
1) allotment of binding agent with the pH value scope be 9～11 GRJ-30 Ludox and pure water in 10:1 ratio mix, just can carry out the slip configuration after fully stirring.
2) the surface layer Pulp preparation is poured ready binding agent in the DXPJ quick mixer in right amount, adds while stirring shop powder (280#～300#), first high-speed stirred 15 minutes.Splash if any slip and can suitably reduce rotating speed.Then use stirring at low speed speed to stir at least again 45 minutes, measure respectively fast penetrant T (account for Ludox weight 0.2%) and defoamer (account for Ludox weight 0.2%), and after adding industrial alcohol dilution with volume, add the surface layer slip.Stopping to stir rear slip measurement proportion is 2.75, and slurry viscosity is 30.
3) the surface layer stucco adopts that shop sand carries out the surface layer stucco on 70 purposes, and drying time, 9h did 1 layer of the number of plies certainly.Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%
4) preparation of transition zone slurry and step 2) identical.But slurry proportion is 1.75, and slurry viscosity is 20.
5) the transition zone stucco adopts that shop sand carries out the surface layer stucco on 35 purposes, and drying time, 7h did 2 layers of the numbers of plies certainly.Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%
6) preparation of back-up coat slurry and the 2nd identical step.But upper shop powder is 200#, and slurry proportion is 1.70, and slurry viscosity is 19.
7) the back-up coat stucco adopts that shop sand carries out the surface layer stucco on 22 purposes, drying time 7h, wind is dry, 3 layers of the numbers of plies.Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%
8) the obturage preparation of layer slurry and step 2) identical.But slurry proportion is 1.68, and slurry viscosity is 20.
9) layer dry drying time of the 10h that obturages, wind is dry, 1 layer of the number of plies.Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%.
Embodiment 3
1) allotment of binding agent with the pH value scope be 9～11 GRJ-30 Ludox and distilled water in 10:1 ratio mix, just can carry out the slip configuration after fully stirring.
2) the surface layer Pulp preparation is poured ready binding agent in the DXPJ quick mixer in right amount, adds while stirring shop powder (280#～300#), first high-speed stirred 15 minutes.Splash if any slip and can suitably reduce rotating speed.Then use stirring at low speed speed to stir at least again 45 minutes, measure respectively fast penetrant T (account for Ludox weight 0.2%) and defoamer (account for Ludox weight 0.2%), and after adding industrial alcohol dilution with volume, add the surface layer slip.Stopping to stir rear slip measurement proportion is 2.65, and slurry viscosity is 28.
3) the surface layer stucco adopts that shop sand carries out the surface layer stucco on 70 purposes, and drying time, 9h did 2 layers of the numbers of plies certainly.Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%
4) preparation of transition zone slurry and step 2) identical.But slurry proportion is 1.65, and slurry viscosity is 17.
5) the transition zone stucco adopts that shop sand carries out the surface layer stucco on 35 purposes, and drying time, 6h did 2 layers of the numbers of plies certainly.Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%.
6) preparation of back-up coat slurry and the 2nd identical step.But upper shop powder is 200#, and slurry proportion is 1.60, and slurry viscosity is 16.
7) the back-up coat stucco adopts that shop sand carries out the surface layer stucco on 22 purposes, drying time 6h, wind is dry, 2 layers of the numbers of plies.Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%
8) the obturage preparation of layer slurry and step 2) identical.But slurry proportion is 1.6, and slurry viscosity is 17.
9) layer dry drying time of the 9h that obturages, wind is dry, 1 layer of the number of plies.Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%.
Claims (2)
1. an investment pattern precise casting shell-making method that is applicable to stainless cast steel part is characterized in that, may further comprise the steps:
1) allotment of binding agent: be that 9～11 GRJ-30 type Ludox mixes by the weight ratio of 10:1 with distilled water or pure water with the pH value scope, fully stir and obtain binding agent;
2) the surface layer Pulp preparation is poured ready binding agent in the DXPJ quick mixer into, adds while stirring upper shop powder, first high-speed stirred 15 minutes; Then use stirring at low speed speed to stir at least again 45 minutes, measure respectively fast penetrant T and defoamer, and after the industrial alcohol dilution of adding with weight, add the surface layer slip; Stopping to stir rear slip measurement proportion is 2.9, and slurry viscosity is 35;
3) the surface layer stucco adopts that shop sand carries out the surface layer stucco on 70 purposes, and drying time, 10h did 1 layer of the number of plies certainly; Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%;
4) preparation of transition zone slurry and step 2) identical, but upper shop powder is 200#, and it is 1.8 that slip is measured proportion, and slurry viscosity is 22;
5) the transition zone stucco adopts that shop sand carries out the surface layer stucco on 35 purposes, and drying time, 8h did certainly, 2 layers of the numbers of plies, and environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%;
6) preparation of back-up coat slurry and step 2) identical, but slip measurement proportion is 1.7, slurry viscosity is 20;
7) the back-up coat stucco adopts that shop sand carries out the surface layer stucco on 22 purposes, drying time 8h, wind is dry, 3 layers of the numbers of plies; Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%;
8) the obturage preparation of layer slurry and a step 2) identical, but slip measurement proportion is 1.75, slurry viscosity is 22;
9) layer dry drying time of the 12h that obturages, wind is dry, 1 layer of the number of plies; Environment temperature: 21 ± 1.5 ℃, ambient humidity: 50% ± 10%.
2. the investment pattern precise casting shell-making method that is applicable to stainless cast steel part according to claim 1 is characterized in that step 2) in, the upper shop powder of adding 280#～300#, according to the weight ratio meter, the ratio of Ludox and upper shop powder is 1:3.3; Described fast penetrant T accounts for 0.2% of Ludox weight; Described defoamer accounts for 0.2% of Ludox weight; Add industrial alcohol and account for 0.2% of Ludox weight.
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| CN103600030A (en) * | 2013-08-30 | 2014-02-26 | 泰州枫叶冶金设备有限公司 | Preparation method of heat-resisting alloy sliding-block shell by investment casting |
| CN103658537A (en) * | 2014-01-06 | 2014-03-26 | 安徽厚林精密金属科技有限公司 | Mould shell manufacturing method for casting tool by using 4cr13 |
| CN104815959A (en) * | 2015-05-05 | 2015-08-05 | 柳州科尔特锻造机械有限公司 | Precision casting process of casting |
| CN104815960A (en) * | 2015-05-05 | 2015-08-05 | 柳州科尔特锻造机械有限公司 | Process improving total quality of casting |
| CN104923729A (en) * | 2015-06-24 | 2015-09-23 | 西安航空动力股份有限公司 | Manufacturing method of composite shell of large diffuser precision casting |
| CN105081216A (en) * | 2014-05-13 | 2015-11-25 | 陕西宏远航空锻造有限责任公司 | Method for preparing surface layer in investment casting shell making process through mullite material |
| CN106494163A (en) * | 2016-12-02 | 2017-03-15 | 伟成金属制品有限公司 | Truck bridge structure part and its investment casting method |
| CN106825401A (en) * | 2017-02-22 | 2017-06-13 | 江苏汤臣汽车零部件有限公司 | A kind of truck Retarder impeller wax-pattern shell side method |
| CN106862489A (en) * | 2017-02-22 | 2017-06-20 | 江苏汤臣汽车零部件有限公司 | A kind of truck Retarder Impeller Machining method |
| CN107199309A (en) * | 2017-06-08 | 2017-09-26 | 淄博金东机械制造有限公司 | A kind of casting module process for making shell |
| CN111001757A (en) * | 2019-12-27 | 2020-04-14 | 西安西工大超晶科技发展有限责任公司 | Rapid production method of porous stainless steel pipe seat casting with high surface quality |
| CN111014571A (en) * | 2019-12-31 | 2020-04-17 | 南通海泰科特精密材料有限公司 | Slurry mixing and stirring method for improving slurry performance and casting quality in investment casting |
| CN111266530A (en) * | 2020-02-28 | 2020-06-12 | 元祥精密机电新沂有限公司 | Production process of high-welding-precision corrosion-resistant mirror surface stainless steel casting |
| CN111299510A (en) * | 2020-03-31 | 2020-06-19 | 中国航发动力股份有限公司 | Preparation method of aluminum alloy casting shell |
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| CN103600030A (en) * | 2013-08-30 | 2014-02-26 | 泰州枫叶冶金设备有限公司 | Preparation method of heat-resisting alloy sliding-block shell by investment casting |
| CN103658537A (en) * | 2014-01-06 | 2014-03-26 | 安徽厚林精密金属科技有限公司 | Mould shell manufacturing method for casting tool by using 4cr13 |
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| CN105081216A (en) * | 2014-05-13 | 2015-11-25 | 陕西宏远航空锻造有限责任公司 | Method for preparing surface layer in investment casting shell making process through mullite material |
| CN104815959A (en) * | 2015-05-05 | 2015-08-05 | 柳州科尔特锻造机械有限公司 | Precision casting process of casting |
| CN104815960A (en) * | 2015-05-05 | 2015-08-05 | 柳州科尔特锻造机械有限公司 | Process improving total quality of casting |
| CN104923729A (en) * | 2015-06-24 | 2015-09-23 | 西安航空动力股份有限公司 | Manufacturing method of composite shell of large diffuser precision casting |
| CN106494163B (en) * | 2016-12-02 | 2018-11-27 | 伟成金属制品有限公司 | Truck bridge structure part |
| CN106494163A (en) * | 2016-12-02 | 2017-03-15 | 伟成金属制品有限公司 | Truck bridge structure part and its investment casting method |
| CN106825401A (en) * | 2017-02-22 | 2017-06-13 | 江苏汤臣汽车零部件有限公司 | A kind of truck Retarder impeller wax-pattern shell side method |
| CN106862489A (en) * | 2017-02-22 | 2017-06-20 | 江苏汤臣汽车零部件有限公司 | A kind of truck Retarder Impeller Machining method |
| CN106862489B (en) * | 2017-02-22 | 2018-12-11 | 江苏汤臣汽车零部件有限公司 | A kind of truck Retarder Impeller Machining method |
| CN107199309A (en) * | 2017-06-08 | 2017-09-26 | 淄博金东机械制造有限公司 | A kind of casting module process for making shell |
| CN111001757A (en) * | 2019-12-27 | 2020-04-14 | 西安西工大超晶科技发展有限责任公司 | Rapid production method of porous stainless steel pipe seat casting with high surface quality |
| CN111014571A (en) * | 2019-12-31 | 2020-04-17 | 南通海泰科特精密材料有限公司 | Slurry mixing and stirring method for improving slurry performance and casting quality in investment casting |
| CN111266530A (en) * | 2020-02-28 | 2020-06-12 | 元祥精密机电新沂有限公司 | Production process of high-welding-precision corrosion-resistant mirror surface stainless steel casting |
| CN111299510A (en) * | 2020-03-31 | 2020-06-19 | 中国航发动力股份有限公司 | Preparation method of aluminum alloy casting shell |
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