CN102921889B - 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 Investment casting technology, particularly shell side method processed in a kind of precision-investment casting process, be particularly useful for the preparation method to dimensional accuracy and the high stainless cast steel part of surface requirements.
Background technology
The requirements of field to product technology performance such as space flight, aviation, navigation, communication are more and more higher, and a lot of complicated structural member is difficult to obtain with additive method.And casting is as a kind of special method, can be good at realizing this point.And precision-investment casting method has advantageous advantage to producing especially some surface quality and the strict complex structural member of dimension precision requirement.Domestic and international precision-investment casting method mainly for the foundry goods manufacture of some light metal alloys such as magnesium alloy, aluminium alloy, and achieves very large achievement, and the work still carried out for the hot investment casting of heavy metal as stainless cast steel part that ask for something is high is few.
Affect in precision-investment casting the factor of surface quality of continuous castings and dimensional accuracy except the quality of wax-pattern, the selection of process for making shell is also vital technology.Present stage, both at home and abroad main zirconium English powder and the upper shop sand of adopting is as die casing material, but due to zirconium English powder expensive, for batch production, cost is very large.So, all actively finding better technique and material, on the basis of performance requirement meeting final casting, reducing the use amount of zirconium English powder, reducing costs.
Summary of the invention
The object of the invention is to the shortcoming overcoming above-mentioned prior art, a kind of investment pattern precise casting shell-making method being applicable to stainless cast steel part is provided, the method adopts the upper shop powder that price is cheaper, buying is convenient, proportioning is simple, under the prerequisite not reducing 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 object of the invention is to solve by the following technical programs:
This investment pattern precise casting shell-making method being applicable to stainless cast steel part, comprises the following steps:
1) allotment of binding agent: by pH value range be 9 ~ 11 GRJ-30 type Ludox mix by the weight ratio of 10:1 with distilled water or pure water, carry out fully stirring obtaining binding agent;
2) surface layer Pulp preparation: ready binding agent is poured in DXPJ quick mixer, add shop powder while stirring, first high-speed stirred 15 minutes; Then use stirring at low speed speed at least to stir 45 minutes again, measure fast penetrant T and defoamer respectively, and after adding the industrial alcohol dilution of same weight, add surface layer slip; Stopping stirring rear slip measurement proportion is 2.9, and slurry viscosity is 35.
3) surface layer stucco: adopt shop sand in 70 objects to carry out surface layer stucco, drying time, 10h, certainly dry, the number of plies 1 layer; Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%;
4) transition zone slurry preparation: with step 2) identical, but upper shop powder is 200#, it is 1.8 that slip measures proportion, and slurry viscosity is 22;
5) transition zone stucco: adopt shop sand in 35 objects to carry out surface layer stucco, drying time, 8h, certainly dry, the number of plies 2 layers, environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%;
6) back-up coat slurry preparation: with step 2) identical, but slip measurement proportion is 1.7, slurry viscosity is 20;
7) back-up coat stucco: adopt shop sand in 22 objects to carry out surface layer stucco, drying time 8h, wind is dry, the number of plies 3 layers; Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%;
8) prepared by layer slurry of obturaging: with step 2) identical, but slip measurement proportion is 1.75, slurry viscosity is 22;
9) to obturage layer drying: time 12h, wind is dry, the number of plies 1 layer; Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%.
Further, above-mentioned steps 2) in, add the shop powder of 280# ~ 300#, according to mass ratio range, 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 that industrial alcohol accounts for Ludox weight 0.2%.
The present invention has following beneficial effect:
The upper shop powder that the present invention mainly adopts price cheaper, buying is convenient, preparation technology is succinct, proportioning is easy, can reach under the prerequisite not reducing formwork and surface quality of continuous castings, the object of effective reduction aluminium alloy precision-investment casting production cost, effectively improves the quality of foundry goods, improves production efficiency and casting yield.
Detailed description of the invention
The present invention is applicable to the investment pattern precise casting shell-making method of stainless cast steel part, comprises successively to the preparation of surface layer, transition zone, back-up coat, layer of obturaging, specifically carries out according to following steps:
1) allotment of binding agent: by pH value range be 9 ~ 11 GRJ-30 type Ludox mix by the weight ratio of 10:1 with distilled water or pure water, carry out fully stirring obtaining binding agent;
2) surface layer Pulp preparation: ready binding agent is poured in DXPJ quick mixer, add shop powder while stirring, first high-speed stirred 15 minutes; Then use stirring at low speed speed at least to stir 45 minutes again, measure fast penetrant T and defoamer respectively, and after adding the industrial alcohol dilution of same weight, add surface layer slip; Stopping stirring rear slip measurement proportion is 2.9, and slurry viscosity is 35.Wherein going up shop powder is 280# ~ 300#, and according to mass ratio range, 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 that industrial alcohol accounts for Ludox weight 0.2%.
3) surface layer stucco: adopt shop sand in 70 objects to carry out surface layer stucco, drying time, 10h, certainly dry, the number of plies 1 layer; Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%;
4) preparation of transition zone slurry and step 2) identical, but upper shop powder is 200#, it is 1.8 that slip measures proportion, and slurry viscosity is 22;
5) transition zone stucco: adopt shop sand in 35 objects to carry out surface layer stucco, drying time, 8h, certainly dry, the number of plies 2 layers, environment temperature: 21 ± 1.5 DEG C, 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) back-up coat stucco: adopt shop sand in 22 objects to carry out surface layer stucco, drying time 8h, wind is dry, the number of plies 3 layers; Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%;
8) prepared by layer slurry of obturaging: with step 2) identical, but slip measurement proportion is 1.75, slurry viscosity is 22;
9) to obturage layer drying: drying time 12h, wind is dry, the number of plies 1 layer; Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%.
Below by specific embodiment, the present invention is described in further detail:
Embodiment 1
1) allotment of binding agent: by pH value range be 9 ~ 11 GRJ-30 type Ludox and distilled water in 10:1 ratio mix, just can carry out slip configuration after fully stirring.
2) ready binding agent is poured in DXPJ quick mixer by surface layer Pulp preparation in right amount, adds shop powder (280# ~ 300#) while stirring, first high-speed stirred 15 minutes.Splash suitably can reduce rotating speed if any slip.Then stirring at low speed speed is used at least to stir 45 minutes again, measure fast penetrant T (accounting for 0.2% of Ludox weight) and defoamer (accounting for 0.2% of Ludox weight) respectively, and after adding the industrial alcohol dilution of same weight, add surface layer slip.Stopping stirring rear slip measurement proportion is 2.9, and slurry viscosity is 35.
3) surface layer stucco: adopt shop sand in 70 objects to carry out surface layer stucco, drying time, 10h, certainly dry, the number of plies 1 layer.Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%.
4) transition zone slurry preparation: with step 2) identical, but upper shop powder is 200#, but slurry proportion is 1.8, slurry viscosity is 22.
5) transition zone stucco: adopt shop sand in 35 objects to carry out surface layer stucco, drying time, 8h, certainly dry, the number of plies 2 layers.Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%.
6) back-up coat slurry preparation: with the 4th identical step.But slurry proportion is 1.7, slurry viscosity is 20.
7) back-up coat stucco: adopt shop sand in 22 objects to carry out surface layer stucco, drying time 8h, wind is dry, the number of plies 3 layers.Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%.
8) prepared by layer slurry of obturaging: with step 2) identical.But slurry proportion is 1.75, slurry viscosity is 22.
9) to obturage layer drying: time 12h, wind is dry, the number of plies 1 layer.Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%.
Embodiment 2
1) allotment of binding agent: by pH value range be the GRJ-30 of 9 ~ 11 Ludox and pure water in 10:1 ratio mix, just can carry out slip configuration after fully stirring.
2) surface layer Pulp preparation: poured in right amount by ready binding agent in DXPJ quick mixer, adds shop powder (280# ~ 300#) while stirring, first high-speed stirred 15 minutes.Splash suitably can reduce rotating speed if any slip.Then stirring at low speed speed is used at least to stir 45 minutes again, measure fast penetrant T (accounting for 0.2% of Ludox weight) and defoamer (accounting for 0.2% of Ludox weight) respectively, and after adding the industrial alcohol dilution of same weight, add surface layer slip.Stopping stirring rear slip measurement proportion is 2.75, and slurry viscosity is 30.
3) surface layer stucco: adopt shop sand in 70 objects to carry out surface layer stucco, drying time, 9h, certainly dry, the number of plies 1 layer.Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%
4) transition zone slurry preparation: with step 2) identical.But slurry proportion is 1.75, slurry viscosity is 20.
5) transition zone stucco: adopt shop sand in 35 objects to carry out surface layer stucco, drying time, 7h, certainly dry, the number of plies 2 layers.Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%
6) preparation of back-up coat slurry and the 2nd identical step.But upper shop powder is 200#, slurry proportion is 1.70, and slurry viscosity is 19.
7) back-up coat stucco: adopt shop sand in 22 objects to carry out surface layer stucco, drying time 7h, wind is dry, the number of plies 3 layers.Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%
8) prepared by layer slurry of obturaging: with step 2) identical.But slurry proportion is 1.68, slurry viscosity is 20.
9) to obturage layer drying: drying time 10h, wind is dry, the number of plies 1 layer.Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%.
Embodiment 3
1) allotment of binding agent: by pH value range be the GRJ-30 of 9 ~ 11 Ludox and distilled water in 10:1 ratio mix, just can carry out slip configuration after fully stirring.
2) surface layer Pulp preparation: poured in right amount by ready binding agent in DXPJ quick mixer, adds shop powder (280# ~ 300#) while stirring, first high-speed stirred 15 minutes.Splash suitably can reduce rotating speed if any slip.Then stirring at low speed speed is used at least to stir 45 minutes again, measure fast penetrant T (accounting for 0.2% of Ludox weight) and defoamer (accounting for 0.2% of Ludox weight) respectively, and after adding the industrial alcohol dilution of same weight, add surface layer slip.Stopping stirring rear slip measurement proportion is 2.65, and slurry viscosity is 28.
3) surface layer stucco: adopt shop sand in 70 objects to carry out surface layer stucco, drying time, 9h, certainly dry, the number of plies 2 layers.Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%
4) transition zone slurry preparation: with step 2) identical.But slurry proportion is 1.65, slurry viscosity is 17.
5) transition zone stucco: adopt shop sand in 35 objects to carry out surface layer stucco, drying time, 6h, certainly dry, the number of plies 2 layers.Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%.
6) back-up coat slurry preparation: with the 2nd identical step.But upper shop powder is 200#, slurry proportion is 1.60, and slurry viscosity is 16.
7) back-up coat stucco: adopt shop sand in 22 objects to carry out surface layer stucco, drying time 6h, wind is dry, the number of plies 2 layers.Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%
8) prepared by layer slurry of obturaging: with step 2) identical.But slurry proportion is 1.6, slurry viscosity is 17.
9) to obturage layer drying: time 9h, wind is dry, the number of plies 1 layer.Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%.
Claims (1)
1. be applicable to an investment pattern precise casting shell-making method for stainless cast steel part, it is characterized in that, comprise the following steps:
1) allotment of binding agent: by pH value range be 9 ~ 11 GRJ-30 type Ludox mix by the weight ratio of 10:1 with distilled water or pure water, carry out fully stirring obtaining binding agent;
2) surface layer Pulp preparation: ready binding agent is poured in DXPJ quick mixer, add shop powder while stirring, first high-speed stirred 15 minutes; Then use stirring at low speed speed at least to stir 45 minutes again, measure fast penetrant T and defoamer respectively, and after adding the industrial alcohol dilution of same weight, add surface layer slip; Stopping stirring rear slip measurement proportion is 2.9, and slurry viscosity is 35; Add the upper shop powder of 280# ~ 300#, according to mass ratio range, 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 that industrial alcohol accounts for Ludox weight 0.2%;
3) surface layer stucco: adopt shop sand in 70 objects to carry out surface layer stucco, drying time, 10h, certainly dry, the number of plies 1 layer; Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%;
4) transition zone slurry preparation: with step 2) identical, but upper shop powder is 200#, it is 1.8 that slip measures proportion, and slurry viscosity is 22;
5) transition zone stucco: adopt shop sand in 35 objects to carry out stucco, drying time, 8h, certainly dry, the number of plies 2 layers, environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%;
6) back-up coat slurry preparation: with step 2) identical, but slip measurement proportion is 1.7, slurry viscosity is 20;
7) back-up coat stucco: adopt shop sand in 22 objects to carry out stucco, drying time 8h, wind is dry, the number of plies 3 layers; Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%;
8) prepared by layer slurry of obturaging: with step 2) identical, but slip measurement proportion is 1.75, slurry viscosity is 22;
9) to obturage layer drying: time 12h, wind is dry, the number of plies 1 layer; Environment temperature: 21 ± 1.5 DEG C, ambient humidity: 50% ± 10%.
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