CN104475685B - 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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- CN104475685B CN104475685B CN201410648208.4A CN201410648208A CN104475685B CN 104475685 B CN104475685 B CN 104475685B CN 201410648208 A CN201410648208 A CN 201410648208A CN 104475685 B CN104475685 B CN 104475685B
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- Prior art keywords
- core
- sand
- water
- magnesium sulfate
- soluble
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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
- B22C9/10—Cores; Manufacture or installation of cores
-
- 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
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 particularly, to a kind of aluminium alloy or magnesium
The preparation method of alloy thin-wall intricate casting water solublity core.
Background technology
In space flight and aviation manufacturing industry, in order to alleviate quality, improve aircraft and the structural strength of spacecraft
And mobility, be increasingly employed overall thin-walled workpiece, as the thin-wall frame in aircraft components,
Wallboard, rib and engine turbine blade etc..Correspondingly, to these metal alloys (such as aluminium alloy,
Magnesium alloy) requirement of thin-walled workpiece is the harshest, especially, when this type of thin-walled workpiece with
When complicated inner-cavity structure or thin, curved, long cavernous structure and its core are combination cores, can lead
After causing the casting of foundry goods, cleaning work is extremely difficult, thus requires the collapsibility performance that core is higher.
The most conventional thin-walled workpiece combination core includes resin sand core and sodium silicate sand core etc..Tree
Fat 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,
Get angry big, easily cause the casting flaw such as pore, cold shut, and have serious problem of environmental pollution；Water
Glass sand is the molding sand of more environmental protection in current Foundry Production, but hygroscopicity is very under ambient humidity
By force, and when it is applied to cast cold, the collapsibility performance in portion temperature interval is the most undesirable,
Water-soluble effect is poor, and after causing foundry goods casting, fettler is felt embarrassed, additionally, make molding sand with water-glass sand, its
Regenerating used is the most difficult.
To this end, prior art having been proposed that, employing water soluble sulfate core is to prepare metal thin-wall knot
The scheme of component, when its research application is still at an early stage.Such as, what celebrating etc. propose one
The water-soluble core of magnesium sulfate, but it uses single Adlerika to be binding agent, addition is relatively big and intensity not
Height, and kaolinic addition easily makes core get angry increase；CN101391453A discloses one
Utilize core prepared by water-glass sand, but its hygroscopicity under air ambient be big, sand core strength loss is big,
Requiring to pour into a mould in very short time, operation easier is big, and in part low heating temperature interval, water-soluble
Effect is poor；In the way of blowing hot-air, magnesium sulfate water is prepared additionally, US7000680B discloses
The method of molten core, but its binding agent addition is the biggest, causes core to be got angry increase accordingly.
Summary of the invention
For disadvantages described above or the Improvement requirement of prior art, the invention provides a kind of aluminium alloy or magnesium
The alloy thin-wall intricate casting preparation method of water solublity core, wherein by participating in thing to as key
The component of compound binding agent and proportioning carry out research design, important in core preparation technology simultaneously
Technological parameter improves, and should be able to prepare mutually and possess good normal temperature strength, resistance to water soak and chemistry
The water solublity core of stability and relatively low gas forming amount, particularly has water-soluble collapsibility after the casting of excellence,
And to foundry goods without damaging, environmentally safe, it is therefore particularly suitable for that there is complicated inner cavity or elongated
The aluminium alloy of pore structure or the coremaking purposes of Mg alloy thin wall intricate casting and the quick of foundry goods are cleared up.
For achieving the above object, it is proposed, according to the invention, provide a kind of aluminium alloy or Mg alloy thin wall is complicated
The foundry goods preparation method of water solublity core, it is characterised in that the method comprises the following steps:
The procedure of processing of (a) compound binding agent
At normal temperatures, Magnesium sulfate heptahydrate and plasma water being configured to mass percent is 20%～30%
Magnesium sulfate solution, then a certain amount of aluminum sulfate octadecahydrate and additive are added to this magnesium sulfate
In aqueous solution, and it is heated to 60 DEG C～80 DEG C, thus makes compound binding agent；Wherein said additive
Selected from aluminum phosphate or boric acid etc., and between magnesium sulfate solution, aluminum sulfate octadecahydrate and additive
Parts by weight are set to 4～6:0.5～1:0～0.5；
The procedure of processing of (b) compound core sand
After being premixed in blade mixer by foundry sands uniformly, add answering obtained by step (a)
Close binding agent, and again perform mulling process 60 seconds～90 seconds, thus obtain compound core sand；Wherein
It is set to 100:4.5～7.5 according to ratio of weight and number between foundry sands and compound binding agent；
(c) microwave heating step
Compound core sand obtained by step (b) is put into die for making core compacting, then by itself and mould
Tool is together put in microwave environment and is performed heating, finally takes out the demoulding, is derived from required aluminium alloy
Or Mg alloy thin wall intricate casting water solublity core.
As it is further preferred that in step (b), described foundry sands is selected from the one of following material
Plant or its mixture: great Lin cleans sand, nice foundry sand and Duchang and cleans sand.
As it is further preferred that in step (c), it is preferred to use secondary microwave heat treated mode,
First compound core sand and the mould of compression are together put in microwave oven and heated 30 seconds～60 seconds, take
Go out the demoulding and obtain the core with initial hardness；Then, it is placed again in microwave oven adding by this core
Heat 50 seconds～120 seconds, is derived from required aluminium alloy or Mg alloy thin wall intricate casting water solublity
Core product.
As it is further preferred that in step (c), the process conditions of described microwave heating preferably by
It is set as: microwave heating watt level is with sand sample size variation, when sand sample weight 100g～1000g,
Microwave heating power is 1KW～2KW, and secondary microwave heat time heating time is 35 seconds first heat time heating times～45
Second, again 50 seconds heat time heating times～60 seconds.
In general, by the contemplated above technical scheme of the present invention compared with prior art, pass through
Component and outfit, its proportion in foundry sands to compound binding agent, and to coremaker
Key reaction parameter such as microwave heating etc. during skill carries out studying and contrast test, obtained product
After product can solve aluminum (magnesium) the alloy-steel casting casting of complicated inner cavity structure, the cleaning of its core sand difficult must be asked
Topic, core had both had high intensity and preferable chemical stability and resistance to water soak, had again the water-soluble of excellence
Collapsibility performance, old sand reclaims convenient and simple simultaneously, and to foundry goods not damaged, environmentally safe,
Can realize Green foundry, the processing being therefore particularly suitable for space flight and aviation entirety thin-walled workpiece etc is used
On the way.
Accompanying drawing explanation
Fig. 1 is the preparation technology flow chart of the water solublity core according to 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 the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing
And embodiment, the present invention is further elaborated.Should be appreciated that described herein specifically
Embodiment only in order to explain the present invention, is not intended to limit the present invention.Additionally, it is disclosed below
Just may be used as long as technical characteristic involved in each embodiment of the present invention does not constitutes conflict each other
To be mutually combined.
Embodiment 1:
Core material prepares: 100 part of 50/100 mesh great Lin cleans sand, 5.5 parts of compound binding agents.
Magnesium sulfate heptahydrate and water are configured to 30% magnesium sulfate solution, take 5 parts of magnesium sulfate solutions,
Again 0.5 part of aluminum sulfate octadecahydrate added in magnesium sulfate solution and be heated to 70 DEG C, being formed compound viscous
Knot agent solution；Great Lin sand is premixed in puddle mixer 15s, is subsequently added compound binding agent mulling 90s,
Obtain compound core sand；Then wooden model coremaking, puts into (1400W, lower same) heating 40s in microwave oven,
The demoulding after taking-up, is placed again in microwave oven heating 50s, is cooled to room temperature and obtains core.
By producing " 8 " word sample, survey its tensile strength 1.2～1.3MPa, can be directly used for cast；
Envionmental humidity 70%～80%, sample 4h deposits intensity (tensile strength, lower same) 0.8～0.9MPa.
After core sample simulation casting, put in appropriate water, can realize water-soluble defeated and dispersed in 1min.
Embodiment 2:
Core material prepares: 100 part of 50/100 mesh nice foundry sand, 4.5 parts of compound binding agents.
Magnesium sulfate heptahydrate and water are configured to 30% magnesium sulfate solution, take 4 parts of magnesium sulfate solutions,
Again 0.5 part of aluminum sulfate octadecahydrate added in magnesium sulfate solution and be heated to 70 DEG C, being formed compound viscous
Knot agent solution；Nice foundry sand is premixed in puddle mixer 15s, is subsequently added compound binding agent mulling 90s,
Obtain compound core sand；Then wooden model coremaking, puts into and heats 40s in microwave oven, the demoulding after taking-up, then
Secondary putting into heats 50s in microwave oven, be cooled to room temperature and obtain core.
By producing " 8 " word sample, survey its tensile strength 1.7～1.9MPa, can be directly used for cast；
Envionmental humidity 20%～30%, sample 8h deposits intensity 1.0～1.1MPa.Core sample is simulated
After cast, put in appropriate water, can realize water-soluble defeated and dispersed in 1min.
Embodiment 3:
Core material prepares: 100 part of 70/140 mesh Duchang cleans sand, 6.5 parts of compound binding agents.
Magnesium sulfate heptahydrate and water are configured to 30% magnesium sulfate solution, take 6 parts of magnesium sulfate solutions,
Again 0.5 part of aluminum sulfate octadecahydrate added in magnesium sulfate solution and be heated to 70 DEG C, being formed compound viscous
Knot agent solution；Duchang sand is premixed in puddle mixer 15s, is subsequently added compound binding agent mulling 90s,
Obtain compound core sand；Then wooden model coremaking, puts into and heats 40s in microwave oven, the demoulding after taking-up, then
Secondary putting into heats 50s in microwave oven, be cooled to room temperature and obtain core.
By producing " 8 " word sample, survey its tensile strength 0.8～1.0MPa, can be directly used for cast；
Envionmental humidity 70%～80%, sample 4h deposits intensity 0.6～0.7MPa.Core sample is simulated
After cast, put in appropriate water, can realize water-soluble defeated and dispersed in 1min.
Embodiment 4:
Core material prepares: 100 part of 50/100 mesh great Lin cleans sand, 6 parts of compound binding agents.
Magnesium sulfate heptahydrate and water are configured to 30% magnesium sulfate solution, take 5 parts of magnesium sulfate solutions,
Again 0.5 part of aluminum sulfate octadecahydrate and 0.5 part of aluminum phosphate are added in magnesium sulfate solution and be heated to
70 DEG C, form compoiste adhering agent solution；Great Lin sand is premixed in puddle mixer 15s, is subsequently added compound
Binding agent mulling 90s, obtains compound core sand；Then wooden model coremaking, puts into heating 40s in microwave oven,
The demoulding after taking-up, is placed again in microwave oven heating 60s, is cooled to room temperature and obtains core.
By producing " 8 " word sample, survey its tensile strength 1.3～1.4MPa, can be directly used for cast；
Envionmental humidity 70%～80%, sample 4h deposits intensity 0.7～0.8MPa.Core sample is simulated
After cast, put in appropriate water, can realize water-soluble defeated and dispersed in 2min.
Embodiment 5:
Core material prepares: 100 part of 50/100 mesh great Lin cleans sand, 6 parts of compound binding agents.
Magnesium sulfate heptahydrate and water are configured to 30% magnesium sulfate solution, take 5 parts of magnesium sulfate solutions,
Again 0.5 part of aluminum sulfate octadecahydrate and 0.5 part of boric acid are added in magnesium sulfate solution and are heated to 80 DEG C,
Form compoiste adhering agent solution；Great Lin sand is premixed in puddle mixer 15s, is subsequently added compound binding agent
Mulling 90s, obtains compound core sand；Then wooden model coremaking, puts into heating 40s in microwave oven, takes out
The rear demoulding, is placed again in microwave oven heating 50s, is cooled to room temperature and obtains core.
By producing " 8 " word sample, survey its tensile strength 1.4～1.5MPa, can be directly used for cast；
Envionmental humidity 70%～80%, sample 4h deposits intensity 0.9～1.0MPa.Core sample is simulated
After cast, put in appropriate water, can realize water-soluble defeated and dispersed in 5min.
Embodiment 6:
Core material prepares: 100 part of 50/100 mesh great Lin cleans sand, 6 parts of compound binding agents.
Magnesium sulfate heptahydrate and water are configured to 30% magnesium sulfate solution, take 5 parts of magnesium sulfate solutions,
Again 0.5 part of aluminum sulfate octadecahydrate, 0.25 part of aluminum phosphate and 0.25 part of boric acid are added magnesium sulfate solution
In and be heated to 80 DEG C, formed compoiste adhering agent solution；Great Lin sand is premixed in puddle mixer 15s, with
Rear addition compound binding agent mulling 90s, obtains compound core sand；Then wooden model coremaking, puts into microwave oven
Middle heating 40s, the demoulding after taking-up, it is placed again in microwave oven heating 60s, is cooled to room temperature and obtains
Core.
By producing " 8 " word sample, survey its tensile strength 1.2～1.3MPa, can be directly used for cast；
Envionmental humidity 70%～80%, sample 4h deposits intensity 0.8～0.9MPa.Core sample is simulated
After cast, put in appropriate water, can realize water-soluble defeated and dispersed in 3min.
Test as a example by a sample by following, according to the core of this embodiment heat hardening,
There is under air ambient the higher property deposited.Compound binding agent addition accounts for sand and weighs 6% (magnesium sulfate is water-soluble
Liquid accounts for 5%, and aluminum sulfate octadecahydrate accounts for 1%), when envionmental humidity is 70%～80%, prepared
The 4h of core deposits intensity up to 1.2MPa (tensile strength) left and right；When envionmental humidity be 20%～
When 30%, the 8h of prepared core deposits intensity up to 1.1MPa (tensile strength) left and right.
As it will be easily appreciated by one skilled in the art that and the foregoing is only presently preferred embodiments of the present invention,
Not in order to limit the present invention, all made within the spirit and principles in the present invention any amendment, etc.
With replacement and improvement etc., should be included within the scope of the present invention.
Claims (2)
1. aluminium alloy or a Mg alloy thin wall intricate casting preparation method for water solublity core, it is special
Levying and be, this preparation method comprises the following steps:
The procedure of processing of (a) compound binding agent
At normal temperatures, Magnesium sulfate heptahydrate and plasma water being configured to mass percent is 20%～30%
Magnesium sulfate solution, then a certain amount of aluminum sulfate octadecahydrate and additive are added to this magnesium sulfate
In aqueous solution, and it is heated to 60 DEG C～80 DEG C, thus makes compound binding agent；Wherein said additive
Selected from aluminum phosphate or boric acid, and described magnesium sulfate solution, described aluminum sulfate octadecahydrate and described add
Add the parts by weight between agent and be set to 4～6:0.5～1:0.5；
The procedure of processing of (b) compound core sand
After being premixed in blade mixer by foundry sands uniformly, add answering obtained by step (a)
Close binding agent, and again perform mulling process 60 seconds～90 seconds, thus obtain compound core sand；Wherein
Between described foundry sands and described compound binding agent according to ratio of weight and number be set to 100:4.5～
7.5；
(c) secondary microwave heating steps
Compound core sand obtained by step (b) is put into die for making core compacting, then by itself and mould
Tool is together put into and is performed heating 35 seconds～45 seconds in microwave environment, takes out demoulding acquisition and has initial hardness
Core；Then, this core is placed again in microwave oven heating 50 seconds～60 seconds, is derived from
Required aluminium alloy or Mg alloy thin wall intricate casting water solublity core product；Additionally, described microwave
The process conditions of heating are set to microwave heating watt level with sand sample size variation, wherein sand sample weight
During amount 100g～1000g, microwave heating power is 1KW～2KW.
2. the method for claim 1, it is characterised in that in step (b), described casting
Make roughing sand to clean sand, nice foundry sand and Duchang clean selected from one or its mixture: the great Lin of following material
Sand.
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| CN105170911B (en) * | 2015-08-31 | 2017-10-20 | 沈阳铸造研究所 | A kind of complicated abnormal shape is combined the manufacture method of 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 |
| DE112016006377T5 (en) * | 2016-03-07 | 2018-10-18 | Suzhou Mingzhi Technology Co., Ltd | Core production 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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