CN104475685A - Preparation method of water-soluble sand core used for aluminium alloy or magnesium alloy thin wall complex casting - Google Patents
Preparation method of water-soluble sand core used for aluminium alloy or magnesium alloy thin wall complex casting Download PDFInfo
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- CN104475685A CN104475685A CN201410648208.4A CN201410648208A CN104475685A CN 104475685 A CN104475685 A CN 104475685A CN 201410648208 A CN201410648208 A CN 201410648208A CN 104475685 A CN104475685 A CN 104475685A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a preparation method of a water-soluble sand core used for an aluminium alloy or a magnesium alloy thin wall complex casting, and the method is as follows: (a) at room temperature, preparing magnesium sulfate heptahydrate and plasma water into a 20% to 30% magnesium sulfate aqueous solution, adding specific amount of octadecahydrate aluminum sulfate and an additive into the 20% to 30% magnesium sulfate aqueous solution, and heating to 60 to 80 DEG C to prepare a compound binder; (b) premixing homogeneously foundry raw sand, adding a composite binder to obtain mixture core sand; (c) putting the obtained mixture core sand into a core making mould, then putting the mixture core sand together with the mould into microwave environment for heating, removing and demoulding to obtain a water-soluble sand core product. By the method, the water-soluble sand core with good room temperature strength, moisture resistance, chemical stability and low gas-forming amount can be produced, and the water-soluble sand core especially has excellent water soluble collapsibility after casting, and causes no damage to the casting and no pollution to the environment.
Description
Technical field
The invention belongs to aviation and wide technical field, more specifically, relate to the preparation method of a kind of aluminium alloy or the water-soluble core of Mg alloy thin wall intricate casting.
Background technology
In space flight and aviation manufacturing industry, in order to alleviate quality, improving structural strength and the mobility of aircraft and spacecraft, adopting overall thin-walled workpiece more and more, as the thin-wall frame in aircraft components, wallboard, rib and engine turbine blade etc.Correspondingly, also very harsh to the requirement of these metal alloys (such as aluminium alloy, magnesium alloy) thin-walled workpiece, especially, when this type of thin-walled workpiece is combination core with the inner-cavity structure of complexity or thin, curved, long cavernous structure and its core, after causing the casting of foundry goods, cleaning work is very difficult, thus requires the collapsibility performance that core is higher.
Thin-walled workpiece combination core conventional at present comprises resin sand core and sodium silicate sand core etc.Resin sand core has higher-strength, is often used to produce this type of foundry goods, but the defeated and dispersed difficulty of resin sand core low temperature, gets angry large, easily causes the casting flaw such as pore, cold shut, and has serious problem of environmental pollution; Water-glass sand is the molding sand of comparatively environmental protection in current Foundry Production, but hygroscopicity is very strong under ambient humidity, and it is when being applied to cast cold, collapsibility performance in portion temperature interval is still undesirable, water-soluble effect is poor, and after causing foundry goods to be cast, fettler is felt embarrassed, in addition, make molding sand with water-glass sand, its regenerating used is comparatively difficult.
For this reason, propose in prior art to adopt water soluble sulfate core to prepare the scheme of metal thin-wall structural member, when its research application is still in the starting stage.Such as, He Jiaqing etc. propose the water-soluble core of a kind of magnesium sulfate, but it adopts single Adlerika to be binding agent, and addition is comparatively large and intensity is not high, and kaolinic adding easily makes core get angry increase; Disclose a kind of core utilizing water-glass sand to prepare in CN101391453A, but its hygroscopicity under air ambient is large, sand core strength loss is large, require to pour into a mould in very short time, operation easier is large, and in the low heating temperature interval of part, water-soluble effect is poor; In addition, disclose to blow the mode of hot-air to prepare the method for the water-soluble core of magnesium sulfate in US7000680B, but its binding agent addition is still comparatively large, the corresponding core that causes is got angry increase.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides the preparation method of a kind of aluminium alloy or the water-soluble core of Mg alloy thin wall intricate casting, wherein by carrying out research and design to the component of the compound binding agent as crucial partner and proportioning, important technical parameter in core preparation technology is improved simultaneously, should be able to obtain mutually and possess good normal temperature strength, the water-soluble core of resistance to water soak and chemical stability and lower gas forming amount, particularly there is water-soluble collapsibility after excellent casting, and to foundry goods without damage, environmentally safe, thus the quick cleaning with the aluminium alloy of complicated inner cavity or elongated hole structure or the coremaking purposes of Mg alloy thin wall intricate casting and foundry goods is particularly useful for.
For achieving the above object, according to the present invention, provide a kind of aluminium alloy or the Mg alloy thin wall intricate casting preparation method of water-soluble core, it is characterized in that, the method comprises the following steps:
The procedure of processing of (a) compound binding agent
At normal temperatures, epsom salt and plasma water are mixed with the magnesium sulfate solution that mass percent is 20% ~ 30%, then a certain amount of aluminum sulfate octadecahydrate and additive are added in this magnesium sulfate solution, and are heated to 60 DEG C ~ 80 DEG C, make compound binding agent thus; Wherein said additive is selected from aluminum phosphate or boric acid etc., and magnesium sulfate solution, parts by weight between aluminum sulfate octadecahydrate and additive are set to 4 ~ 6:0.5 ~ 1:0 ~ 0.5;
The procedure of processing of (b) compound core sand
After even for foundry sands premix in blade mixer, add the compound binding agent obtained by step (a), and again perform mulling process 60 seconds ~ 90 seconds, obtain compound core sand thus; Wherein be set to 100:4.5 ~ 7.5 according to ratio of weight and number between foundry sands and compound binding agent;
(c) heating using microwave step
Compound core sand step (b) obtained puts into die for making core compacting, then itself and mould are together put into microwave environment and perform heating, finally take out the demoulding, obtain required aluminium alloy or the water-soluble core of Mg alloy thin wall intricate casting thus.
As further preferably, in step (b), described foundry sands is selected from one or its mixture: great Lin scouring sand, nice foundry sand and the Duchang scouring sand of following material.
As further preferably, in step (c), preferred employing secondary microwave heats mode, namely first the compound core sand of compression and mould is together put into micro-wave oven heating 30 seconds ~ 60 seconds, takes out the demoulding and obtains the core with initial hardness; Then, this core is put into again in micro-wave oven and heat 50 seconds ~ 120 seconds, obtain required aluminium alloy or the water-soluble core product of Mg alloy thin wall intricate casting thus.
As further preferably, in step (c), the process conditions of described heating using microwave are preferably set to: heating using microwave watt level is with sand sample size variation, during sand sample weight 100g ~ 1000g, heating using microwave power is 1KW ~ 2KW, and the secondary microwave heat time is 35 seconds ~ 45 seconds first heat time, again 50 seconds ~ 60 seconds heat time.
In general, the above technical scheme conceived by the present invention compared with prior art, by to the component of compound binding agent and outfit thereof, it is proportion in foundry sands, and key reaction parameter such as the heating using microwave etc. in core manufacturing craft process is studied and contrast test, after obtained product can solve aluminium (magnesium) the alloy-steel casting casting of complicated inner cavity structure, the cleaning of its core sand is difficult obtains problem, core had both had high strength and better chemical stability and resistance to water soak, there is again excellent water-soluble collapsibility performance, old sand reclaims convenient and simple simultaneously, and to foundry goods not damaged, environmentally safe, Green foundry can be realized, thus the processing purposes of the overall thin-walled workpiece of space flight and aviation and so on is particularly useful for.
Accompanying drawing explanation
Fig. 1 is the preparation technology's flow chart according to water-soluble core of the present invention;
Fig. 2 is the coremaking operational flowchart heated according to the secondary microwave of the preferred embodiment for the present invention.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
Embodiment 1:
Core material prepares: 100 part of 50/100 order great Lin cleans sand, 5.5 parts of compound binding agents.
Epsom salt and water are mixed with 30% magnesium sulfate solution, get 5 parts of magnesium sulfate solutions, then 0.5 part of aluminum sulfate octadecahydrate to be added in magnesium sulfate solution and to be heated to 70 DEG C, form compoiste adhering agent solution; By great Lin sand premix 15s in puddle mixer, add compound binding agent mulling 90s subsequently, obtain compound core sand; Then wooden model coremaking, put into micro-wave oven (1400W, lower with) heating 40s, the demoulding after taking out, again puts into micro-wave oven and heats 50s, to be cooledly obtains core to room temperature.
By producing " 8 " word sample, surveying its tensile strength 1.2 ~ 1.3MPa, can cast be directly used in; Envionmental humidity 70% ~ 80%, sample 4h deposits intensity (tensile strength, lower same) 0.8 ~ 0.9MPa.After core sample simulation casting, put into appropriate water, can realize water-soluble defeated and dispersed in 1min.
Embodiment 2:
Core material prepares: 100 part of 50/100 order nice foundry sand, 4.5 parts of compound binding agents.
Epsom salt and water are mixed with 30% magnesium sulfate solution, get 4 parts of magnesium sulfate solutions, then 0.5 part of aluminum sulfate octadecahydrate to be added in magnesium sulfate solution and to be heated to 70 DEG C, form compoiste adhering agent solution; By nice foundry sand premix 15s in puddle mixer, add compound binding agent mulling 90s subsequently, obtain compound core sand; Then wooden model coremaking, puts into micro-wave oven and heats 40s, and the demoulding after taking out, again puts into micro-wave oven and heat 50s, to be cooledly obtains core to room temperature.
By producing " 8 " word sample, surveying its tensile strength 1.7 ~ 1.9MPa, can cast be directly used in; Envionmental humidity 20% ~ 30%, sample 8h deposits intensity 1.0 ~ 1.1MPa.After core sample simulation casting, put into appropriate water, can realize water-soluble defeated and dispersed in 1min.
Embodiment 3:
Core material prepares: 100 part of 70/140 order Duchang cleans sand, 6.5 parts of compound binding agents.
Epsom salt and water are mixed with 30% magnesium sulfate solution, get 6 parts of magnesium sulfate solutions, then 0.5 part of aluminum sulfate octadecahydrate to be added in magnesium sulfate solution and to be heated to 70 DEG C, form compoiste adhering agent solution; By Duchang sand premix 15s in puddle mixer, add compound binding agent mulling 90s subsequently, obtain compound core sand; Then wooden model coremaking, puts into micro-wave oven and heats 40s, and the demoulding after taking out, again puts into micro-wave oven and heat 50s, to be cooledly obtains core to room temperature.
By producing " 8 " word sample, surveying its tensile strength 0.8 ~ 1.0MPa, can cast be directly used in; Envionmental humidity 70% ~ 80%, sample 4h deposits intensity 0.6 ~ 0.7MPa.After core sample simulation casting, put into appropriate water, can realize water-soluble defeated and dispersed in 1min.
Embodiment 4:
Core material prepares: 100 part of 50/100 order great Lin cleans sand, 6 parts of compound binding agents.
Epsom salt and water are mixed with 30% magnesium sulfate solution, get 5 parts of magnesium sulfate solutions, then 0.5 part of aluminum sulfate octadecahydrate and 0.5 part of aluminum phosphate to be added in magnesium sulfate solution and to be heated to 70 DEG C, form compoiste adhering agent solution; By great Lin sand premix 15s in puddle mixer, add compound binding agent mulling 90s subsequently, obtain compound core sand; Then wooden model coremaking, puts into micro-wave oven and heats 40s, and the demoulding after taking out, again puts into micro-wave oven and heat 60s, to be cooledly obtains core to room temperature.
By producing " 8 " word sample, surveying its tensile strength 1.3 ~ 1.4MPa, can cast be directly used in; Envionmental humidity 70% ~ 80%, sample 4h deposits intensity 0.7 ~ 0.8MPa.After core sample simulation casting, put into appropriate water, can realize water-soluble defeated and dispersed in 2min.
Embodiment 5:
Core material prepares: 100 part of 50/100 order great Lin cleans sand, 6 parts of compound binding agents.
Epsom salt and water are mixed with 30% magnesium sulfate solution, get 5 parts of magnesium sulfate solutions, then 0.5 part of aluminum sulfate octadecahydrate and 0.5 part of boric acid to be added in magnesium sulfate solution and to be heated to 80 DEG C, form compoiste adhering agent solution; By great Lin sand premix 15s in puddle mixer, add compound binding agent mulling 90s subsequently, obtain compound core sand; Then wooden model coremaking, puts into micro-wave oven and heats 40s, and the demoulding after taking out, again puts into micro-wave oven and heat 50s, to be cooledly obtains core to room temperature.
By producing " 8 " word sample, surveying its tensile strength 1.4 ~ 1.5MPa, can cast be directly used in; Envionmental humidity 70% ~ 80%, sample 4h deposits intensity 0.9 ~ 1.0MPa.After core sample simulation casting, put into appropriate water, can realize water-soluble defeated and dispersed in 5min.
Embodiment 6:
Core material prepares: 100 part of 50/100 order great Lin cleans sand, 6 parts of compound binding agents.
Epsom salt and water are mixed with 30% magnesium sulfate solution, get 5 parts of magnesium sulfate solutions, then 0.5 part of aluminum sulfate octadecahydrate, 0.25 part of aluminum phosphate and 0.25 part of boric acid to be added in magnesium sulfate solution and to be heated to 80 DEG C, form compoiste adhering agent solution; By great Lin sand premix 15s in puddle mixer, add compound binding agent mulling 90s subsequently, obtain compound core sand; Then wooden model coremaking, puts into micro-wave oven and heats 40s, and the demoulding after taking out, again puts into micro-wave oven and heat 60s, to be cooledly obtains core to room temperature.
By producing " 8 " word sample, surveying its tensile strength 1.2 ~ 1.3MPa, can cast be directly used in; Envionmental humidity 70% ~ 80%, sample 4h deposits intensity 0.8 ~ 0.9MPa.After core sample simulation casting, put into appropriate water, can realize water-soluble defeated and dispersed in 3min.
To test for a sample, according to the core of this embodiment heat hardening, under air ambient, there is the higher property deposited below.Compound binding agent addition accounts for sand and weighs 6% (magnesium sulfate solution accounts for 5%, and aluminum sulfate octadecahydrate accounts for 1%), and when envionmental humidity is 70% ~ 80%, the 4h of prepared core deposits intensity and can reach 1.2MPa (tensile strength) left and right; When envionmental humidity is 20% ~ 30%, the 8h of prepared core deposits intensity and can reach 1.1MPa (tensile strength) left and right.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. aluminium alloy or a Mg alloy thin wall intricate casting preparation method for water-soluble core, it is characterized in that, the method comprises the following steps:
The procedure of processing of (a) compound binding agent
At normal temperatures, epsom salt and plasma water are mixed with the magnesium sulfate solution that mass percent is 20% ~ 30%, then a certain amount of aluminum sulfate octadecahydrate and additive are added in this magnesium sulfate solution, and are heated to 60 DEG C ~ 80 DEG C, make compound binding agent thus; Wherein said additive is selected from aluminum phosphate or boric acid etc., and magnesium sulfate solution, parts by weight between aluminum sulfate octadecahydrate and additive are set to 4 ~ 6:0.5 ~ 1:0 ~ 0.5;
The procedure of processing of (b) compound core sand
After even for foundry sands premix in blade mixer, add the compound binding agent obtained by step (a), and again perform mulling process 60 seconds ~ 90 seconds, obtain compound core sand thus; Wherein be set to 100:4.5 ~ 7.5 according to ratio of weight and number between foundry sands and compound binding agent;
(c) heating using microwave step
Compound core sand step (b) obtained puts into die for making core compacting, then itself and mould are together put into microwave environment and perform heating, finally take out the demoulding, obtain required aluminium alloy or the water-soluble core product of Mg alloy thin wall intricate casting thus.
2. the method for claim 1, is characterized in that, in step (b), described foundry sands is selected from one or its mixture: great Lin scouring sand, nice foundry sand and the Duchang scouring sand of following material.
3. method as claimed in claim 1 or 2, it is characterized in that, in step (c), preferred employing secondary microwave heats mode, namely first the compound core sand of compression and mould are together put into micro-wave oven heating 30 seconds ~ 60 seconds, take out the demoulding and obtain the core with initial hardness; Then, this core is put into again in micro-wave oven and heat 50 seconds ~ 120 seconds, obtain required aluminium alloy or the water-soluble core of Mg alloy thin wall intricate casting thus.
4. the method as described in claim 1-3 any one, it is characterized in that, in step (c), the process conditions of described heating using microwave are preferably set to: heating using microwave watt level is with sand sample size variation, during core weight 100g ~ 1000g, microwave-oven-heating power is 1KW ~ 2KW, and the secondary microwave heat time is 35 seconds ~ 45 seconds first heat time, again 50 seconds ~ 60 seconds heat time.
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| CN105170911A (en) * | 2015-08-31 | 2015-12-23 | 沈阳铸造研究所 | Manufacturing method for complex specially-shaped composite sand core |
| CN105964890A (en) * | 2016-02-18 | 2016-09-28 | 蚌埠市鸿安精密机械有限公司 | Water-soluble mold core used for high-precision aluminium alloy casting and preparation method thereof |
| CN105964927A (en) * | 2016-02-18 | 2016-09-28 | 蚌埠市鸿安精密机械有限公司 | Diatomite-EVA emulsion composite water-soluble mold core and preparation method thereof |
| WO2017152348A1 (en) * | 2016-03-07 | 2017-09-14 | 苏州明志科技有限公司 | Core making machine with integrated microwave curing function |
| CN107262661A (en) * | 2017-05-23 | 2017-10-20 | 厦门建霖工业有限公司 | A kind of high temperature resistance and high strength water-soluble core and preparation method thereof |
| CN109865792A (en) * | 2019-01-30 | 2019-06-11 | 共享智能铸造产业创新中心有限公司 | A kind of sand mold producing Mg alloy castings |
| CN110918900A (en) * | 2019-12-21 | 2020-03-27 | 莱州三力汽车配件有限公司 | Formula and preparation process of high-carbon brake disc |
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| CN107262661A (en) * | 2017-05-23 | 2017-10-20 | 厦门建霖工业有限公司 | A kind of high temperature resistance and high strength water-soluble core and preparation method thereof |
| CN109865792A (en) * | 2019-01-30 | 2019-06-11 | 共享智能铸造产业创新中心有限公司 | A kind of sand mold producing Mg alloy castings |
| CN110918900A (en) * | 2019-12-21 | 2020-03-27 | 莱州三力汽车配件有限公司 | Formula and preparation process of high-carbon brake disc |
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