CN106270395A - A kind of casting technique quickly cooled down for aluminium alloy lost foam - Google Patents
A kind of casting technique quickly cooled down for aluminium alloy lost foam Download PDFInfo
- Publication number
- CN106270395A CN106270395A CN201610777004.XA CN201610777004A CN106270395A CN 106270395 A CN106270395 A CN 106270395A CN 201610777004 A CN201610777004 A CN 201610777004A CN 106270395 A CN106270395 A CN 106270395A
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- sand
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- foam
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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
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
-
- 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
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
-
- 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
- B22C1/186—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 contaming ammonium or metal silicates, silica sols
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
Abstract
The present invention provides a kind of casting technique quickly cooled down for aluminium alloy lost foam, its object is to the aluminium alloy castings quickly cooling down under the molten condition of cast, improves the Forming Quality of foundry goods after quickly cooling, including: preparation process, make foam physical model；Make core step, by foam physical model coating fireproof coating the driest, after sandbox forms cast gate and runner, fix and bury this foam physical model underground with green-sand, then arranging cast gate and exhaust passage, this green-sand includes the mixture of the grains of sand, water and bonding agent；Casting step, this aluminum alloy materials of melting, control the temperature of this aluminum alloy materials of molten, at predetermined temperature, to be poured into a mould by cast gate；Quickly cooling, is passed through cold air after drying at cast gate during foundry goods cooling, again extracts out after 3 6s, and cold air 3 6s being again passed through drying extracts out again, is the most repeatedly cooled to room temperature to casting workpiece.The present invention have simple to operate, casting quality good, the advantage such as pollution-free.
Description
Technical field
The present invention relates to foundary industry technical field, a kind of founder quickly cooled down for aluminium alloy lost foam
Skill.
Background technology
The most domestic nearly ferrous metal lost foam casting achieves rapid progress, and whether yield or quality have very
Big raising, product variety is also expanding further.But aluminium alloy lost foam casting progress is the slowest.At electromotor row
Industry, a vapour once produced the air inlet pipe of a period of time, but stopped production later, and Changsha is from the external making aluminium cylinder lid introduced
Lost foam production line run into the difficult problem of refining aluminium alloy from the beginning, so that not putting into formal production should descend bar.Also have
Some producers also concentration is crossed trial-production and is produced the foundry goods such as air inlet pipe, is not from morning to night particularly formed real in quality in yield
Breakthrough in meaning.In more American-European developed countries, aluminium alloy lost foam foundry engieering the most relatively cast iron, cast steel and iron etc. become increasingly
Ripe, some factories produce aluminium casting with lost foam casting on a large scale.Why contrast is the most big？Abroad mainly have following several
Individual reason: one is the needs of Cost Competition: lost foam casting is higher than metal core efficiency, and cost is more cheap than wet type resin sand core.
Owing to module is bonding easily, less than two part one new disappearance module of composition further reduce cost.Two is evaporative pattern
Thing (sand mold has) is engaged without convex in part surface, and when hydro-hardware surface is flow through, resistance is little, owing to gas flow resistance is little, and engine power
Increase, and uniform wall thickness, it is difficult to occur core shift phenomenon during sand casting.Aluminium alloy lost foam part moulding by casting compares appearance
Easily.The automobile aluminum component market demand potentiality that three is huge are the biggest.Comparing mutually, domestic aluminium alloy produces melting technique and equipment is stagnant
The most more, the Understanding Time of auto industry light weight grey hair exhibition is the longest, original permanent mold casting ferroalloy metallurgy and cast skill
Art does not adapt to the quality needs of evaporative pattern.The client having plus state Cui is unlike abroad emphasizing that practical effect overemphasizes table
Face quality, is reluctant to accept foam green grain vestige, needs the technological factor controlled folded many in casting process, thus difficult.Actual
Some the most external aluminium alloy lost foam part beadlet traces and the pin hole of inessential are the most obvious.
The major defect of aluminium alloy lost foam casting is as follows: 1, because using dry sand filling, and foundry goods rate of cooling is very slow, exacerbates
Aluminum disappears molten middle generation pin hole so that wanting on any section of wall thickness that it is extremely difficult for eliminating pin hole；2 also due to rate of cooling is low,
Thick metallic crystal can be formed at thickness and shrinkage cavity shrinkage porosity may be produced, reducing mechanical strength；3, according to damp sand filling, casting
Though the rate of cooling of part has promoted, but wet sand grains runs into the aluminum water of high temperature fused state and is easily generated the steam of heat and punctures sand mold
Face, produces punching, affects the outward appearance of foundry goods and the mechanical strength of cast-internal.
It is thus desirable to a kind of casting technique quickly cooled down for aluminium alloy lost foam is the most promising.
Summary of the invention
Goal of the invention: the shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of for aluminum conjunction
The casting technique that gold evaporative pattern quickly cools down.
Technical scheme: in order to realize object above, of the present invention a kind of quickly cools down for aluminium alloy lost foam
Casting technique, comprises the steps: preparation process, makes foam physical model；Make core step, by resistance to for the coating of foam physical model
Fire coating is the driest, after forming cast gate and runner, fixes and buries this foam physical model underground, so with green-sand on sandbox
After cast gate and exhaust passage are set, this green-sand includes the mixture of the grains of sand, water and bonding agent；Casting step, this aluminum of melting closes
Gold copper-base alloy, controls the temperature of this aluminum alloy materials of molten, at predetermined temperature, to be poured into a mould by cast gate；And post processing
Step, cuts off the dead head on foundry goods, and foundry goods is carried out heat treatment；Quickly cooling, is passed through through dry at cast gate during foundry goods cooling
Cold air after dry, extracts out after 2S again, and the cold air 2S being again passed through drying extracts out again, repeatedly the coldest to casting workpiece
But to room temperature.
As preferably, in described casting step, the green compression strength in die cavity is maintained between 50-60Kpa, and green-sand is aqueous
Amount is 2.6-2.8%；
As preferably, the compact rate of molding of described green-sand and the ratio of water content are between 7-9；
As preferably, the temperature of this aluminum alloy materials of described molten controls between 650-680 DEG C；
As preferably, described greensand mold is provided with Slag conglomeration agent, SiO in Slag conglomeration agent2Content be: 70-76%, Al2O3Content
For: 8-14%；
As preferably, described in be coated in the fireproof coating in foam physical model be corundum；
As preferably, the bonding agent in described green-sand is Ludox；
1, heretofore described a kind of casting technique quickly cooled down for aluminium alloy lost foam, by casting step, type
The green compression strength of intracavity is maintained between 50-60Kpa, and green sand moisture is 2.6-2.8%, it is possible to reach to reduce lacking of sand hole
Fall into；
2, heretofore described a kind of casting technique quickly cooled down for aluminium alloy lost foam, by the compact rate of molding of green-sand
And the ratio of water content is between 7-9, it is possible to increase the toughness of molding sand；
3, heretofore described a kind of casting technique quickly cooled down for aluminium alloy lost foam, is closed by this aluminum of molten
The temperature of gold copper-base alloy controls between 650-680 DEG C so that temperature can reduce pore while reaching aluminium alloy fusing point and send out
Raw；
4, heretofore described a kind of casting technique quickly cooled down for aluminium alloy lost foam, by being provided with in greensand mold
Slag conglomeration agent, SiO in Slag conglomeration agent2Content be: 70-76%, Al2O3Content be: 8-14%, make that reluctant slag is solidifying to be taken into
Plasticity slag blanket, thus remove the impurity in melting, slag conveniently, neatly, improve metal liquid quality, reduce cost；
5, heretofore described a kind of casting technique quickly cooled down for aluminium alloy lost foam, by being coated in foam entity
Fireproof coating in model is corundum so that draw materials conveniently, and low cost is effective；
6, heretofore described a kind of casting technique quickly cooled down for aluminium alloy lost foam, bonding by green-sand
Agent is Ludox so that Ludox can not only play the effect of good bonding green-sand, also is able to be melted state simultaneously
Aluminium alloy gasification disappear, residue will not be produced；
Owing to using preceding solution, the invention have the benefit that and replace traditional dry sand with green-sand, decrease sand hole
Defect；Due also to have employed Slag conglomeration agent, play insulation, slagging-off effect on smelting metal surface, reluctant slag can be made to coagulate and take
Become plasticity slag blanket, thus remove the impurity in melting, slag conveniently, neatly, improve metal liquid quality, reduce cost；Also
Owing to making green compression strength be maintained at about 50-60Kpa in casting process, water content is 2.6-2.8%, make (compact rate of molding)/
The ratio of (water content), in the scope of 7-9, thus can improve molding sand toughness and reduce the defect of sand hole；And owing to melting
The temperature of this aluminum alloy materials melting shape controls between 650-680 DEG C, it is possible to reduce the generation of gas hole defect；Finally by
Fast quickly cooling removes the cold air being repeatedly passed through after drying, can take away what the dampness that under molten condition, aluminum water runs in green-sand produced
Steam, thus the steam avoiding heat punctures sand mold face, produces punching, affects the outward appearance of foundry goods and the mechanical strong of cast-internal
Degree.
Detailed description of the invention
Embodiment 1
It is suitable for the lost foam casting process of aluminum alloy materials mainly to include preparation process, make core step, casting step and quickly
Cooling step.In the following description, similar to prior art part only carries out general description:
In preparation process, making foam physical model, the manufacture method of foam physical model can being suitable for according to prior art
Model production method in lost foam casting process is carried out, and generally comprises the steps such as prefoam, model forming and model cluster combination,
Polystyrene bead is mainly dealt into suitable density by pre-expansion step in advance, is typically carried out by Rapid steam heating, at mould
In type forming step, the beadlet through prefoam wants advanced line stabilizationization to process, and is then then sent through in the hopper of forming machine, passes through
Charging aperture feeds, and after mold cavity is full of the pre-beadlet sent out, starts to be passed through steam, makes beadlet soften, expands, is crowded with all
Space and being bonded into one, this completes the manufacture process of bubbles model, after molding, passes through in the waterway of mould
Model is cooled down by great deal running water, then opens mould and takes out model；In model cluster combination step, model ripening is stable
After, sectional pattern gluing combination be can be carried out, the final shape with foundry goods and the identical foam physical model of structure obtained, should
Foundry goods can be the foundry goods such as cylinder block, cylinder cover, bent axle, change speed gear box, air inlet pipe, exhaustor and brake hubs.
It follows that carry out making core step.In making core step, first by foam physical model coating fireproof coating the most fully
Being dried, such as, foam physical model is immersed in fireproof coating, then the air at about 40 DEG C circulates in baker and is dried 4
Hour；Then, after sandbox forms cast gate and runner, fix and bury this foam physical model underground with green-sand, then arranging
Cast gate and exhaust passage, this green-sand is the mixture including the grains of sand, water and bonding agent, and bonding agent can be clay, wet at this
In molding sand, the grains of sand account for major part.Greensand mold is provided with Slag conglomeration agent, SiO in Slag conglomeration agent2Content be: 70%, Al2O3Content
For: 8%, exhaust passage is mainly used in after foam physical model vaporizes discharging consequent gas.Described fireproof coating is permissible
Be the main component of coating be the pulverulent material and binding agent that refractoriness is high, stability at elevated temperature is good, the most also added with being easy to
The carrier (water or other solvents) applied and various additament.
Then, casting step is carried out.In casting step, first it is this aluminum alloy materials of melting, such as, is melted by crucible
Change aluminium ingot, after aluminium ingot all melts, scarfing cinder Ji, rotten Ji are respectively placed in aluminum water, wait 10 minutes and going bad, by crucible
Aluminum slag is removed clean, measures aluminum coolant-temperature gage with measuring instrument, and general aluminum coolant-temperature gage should control at 650 DEG C, and suitably insulation one timing
Between, first calculate the theoretical weight of foundry goods, then aluminum liquid is poured into preprepared seat bag, make this foundry goods more flat when casting
Steady and continuous, in order to avoid producing the casting flaws such as oxide skin.Green compression strength in die cavity is maintained at 50Kpa, and green sand moisture is
2.6%, the compact rate of molding of green-sand and the ratio of water content are 7/1, then, are poured into a mould by cast gate, the aluminium alloy of molten
Material enters in the die cavity being full of by foam physical model from runner, and the aluminum alloy materials of high temperature makes foam physical model by vapour
Changing, the produced gas of vaporization is discharged from exhaust passage, behind the space that aluminum alloy materials liquation occupies foam physical model,
Obtain aluminum alloy materials foundry goods.
Post-processing step, cuts off the dead head on foundry goods, and foundry goods is carried out heat treatment.
Quickly cooling, is passed through cold air after drying at cast gate during foundry goods cooling, again extracts out after 3s, be again passed through through
The cold air 3s being dried extracts out again, is the most repeatedly cooled to room temperature to casting workpiece.
Embodiment 2
It is suitable for the lost foam casting process of aluminum alloy materials mainly to include preparation process, make core step, casting step and quickly
Cooling step.In the following description, similar to prior art part only carries out general description:
In preparation process, making foam physical model, the manufacture method of foam physical model can being suitable for according to prior art
Model production method in lost foam casting process is carried out, and generally comprises the steps such as prefoam, model forming and model cluster combination,
Polystyrene bead is mainly dealt into suitable density by pre-expansion step in advance, is typically carried out by Rapid steam heating, at mould
In type forming step, the beadlet through prefoam wants advanced line stabilizationization to process, and is then then sent through in the hopper of forming machine, passes through
Charging aperture feeds, and after mold cavity is full of the pre-beadlet sent out, starts to be passed through steam, makes beadlet soften, expands, is crowded with all
Space and being bonded into one, this completes the manufacture process of bubbles model, after molding, passes through in the waterway of mould
Model is cooled down by great deal running water, then opens mould and takes out model；In model cluster combination step, model ripening is stable
After, sectional pattern gluing combination be can be carried out, the final shape with foundry goods and the identical foam physical model of structure obtained, should
Foundry goods can be the foundry goods such as cylinder block, cylinder cover, bent axle, change speed gear box, air inlet pipe, exhaustor and brake hubs.
It follows that carry out making core step.In making core step, first by foam physical model coating fireproof coating the most fully
Being dried, such as, foam physical model is immersed in fireproof coating, then the air at about 40 DEG C circulates in baker and is dried 4
Hour；Then, after sandbox forms cast gate and runner, fix and bury this foam physical model underground with green-sand, then arranging
Cast gate and exhaust passage, this green-sand is the mixture including the grains of sand, water and bonding agent, and bonding agent can be clay, wet at this
In molding sand, the grains of sand account for major part.Greensand mold is provided with Slag conglomeration agent, SiO in Slag conglomeration agent2Content be: 76%, Al2O3Content
For: 14%, exhaust passage is mainly used in after foam physical model vaporizes discharging consequent gas.Described fireproof coating can
Be the main component of coating be the pulverulent material and binding agent that refractoriness is high, stability at elevated temperature is good, the most also added with just
In the carrier (water or other solvents) applied and various additament.
Then, casting step is carried out.In casting step, first it is this aluminum alloy materials of melting, such as, is melted by crucible
Change aluminium ingot, after aluminium ingot all melts, scarfing cinder Ji, rotten Ji are respectively placed in aluminum water, wait 10 minutes and going bad, by crucible
Aluminum slag is removed clean, measures aluminum coolant-temperature gage with measuring instrument, and general aluminum coolant-temperature gage should control at 680 DEG C, and suitably insulation one timing
Between, first calculate the theoretical weight of foundry goods, then aluminum liquid is poured into preprepared seat bag, make this foundry goods more flat when casting
Steady and continuous, in order to avoid producing the casting flaws such as oxide skin.Green compression strength in die cavity is maintained at 60Kpa, and green sand moisture is
2.8%, the compact rate of molding of green-sand and the ratio of water content are 9/1, then, are poured into a mould by cast gate, the aluminium alloy of molten
Material enters in the die cavity being full of by foam physical model from runner, and the aluminum alloy materials of high temperature makes foam physical model by vapour
Changing, the produced gas of vaporization is discharged from exhaust passage, behind the space that aluminum alloy materials liquation occupies foam physical model,
Obtain aluminum alloy materials foundry goods.
Post-processing step, cuts off the dead head on foundry goods, and foundry goods is carried out heat treatment.
Quickly cooling, is passed through cold air after drying at cast gate during foundry goods cooling, again extracts out after 6s, be again passed through through
The cold air 6s being dried extracts out again, is the most repeatedly cooled to room temperature to casting workpiece.
Embodiment 3
It is suitable for the lost foam casting process of aluminum alloy materials mainly to include preparation process, make core step, casting step and quickly
Cooling step.In the following description, similar to prior art part only carries out general description:
In preparation process, making foam physical model, the manufacture method of foam physical model can being suitable for according to prior art
Model production method in lost foam casting process is carried out, and generally comprises the steps such as prefoam, model forming and model cluster combination,
Polystyrene bead is mainly dealt into suitable density by pre-expansion step in advance, is typically carried out by Rapid steam heating, at mould
In type forming step, the beadlet through prefoam wants advanced line stabilizationization to process, and is then then sent through in the hopper of forming machine, passes through
Charging aperture feeds, and after mold cavity is full of the pre-beadlet sent out, starts to be passed through steam, makes beadlet soften, expands, is crowded with all
Space and being bonded into one, this completes the manufacture process of bubbles model, after molding, passes through in the waterway of mould
Model is cooled down by great deal running water, then opens mould and takes out model；In model cluster combination step, model ripening is stable
After, sectional pattern gluing combination be can be carried out, the final shape with foundry goods and the identical foam physical model of structure obtained, should
Foundry goods can be the foundry goods such as cylinder block, cylinder cover, bent axle, change speed gear box, air inlet pipe, exhaustor and brake hubs.
It follows that carry out making core step.In making core step, first by foam physical model coating fireproof coating the most fully
Being dried, such as, foam physical model is immersed in fireproof coating, then the air at about 40 DEG C circulates in baker and is dried 4
Hour；Then, after sandbox forms cast gate and runner, fix and bury this foam physical model underground with green-sand, then arranging
Cast gate and exhaust passage, this green-sand is the mixture including the grains of sand, water and bonding agent, and bonding agent can be clay, wet at this
In molding sand, the grains of sand account for major part.Greensand mold is provided with Slag conglomeration agent, SiO in Slag conglomeration agent2Content be: 73%, Al2O3Content
For: 11%, exhaust passage is mainly used in after foam physical model vaporizes discharging consequent gas.Described fireproof coating can
Be the main component of coating be the pulverulent material and binding agent that refractoriness is high, stability at elevated temperature is good, the most also added with just
In the carrier (water or other solvents) applied and various additament.
Then, casting step is carried out.In casting step, first it is this aluminum alloy materials of melting, such as, is melted by crucible
Change aluminium ingot, after aluminium ingot all melts, scarfing cinder Ji, rotten Ji are respectively placed in aluminum water, wait 10 minutes and going bad, by crucible
Aluminum slag is removed clean, measures aluminum coolant-temperature gage with measuring instrument, and general aluminum coolant-temperature gage should control at 665 DEG C, and suitably insulation one timing
Between, first calculate the theoretical weight of foundry goods, then aluminum liquid is poured into preprepared seat bag, make this foundry goods more flat when casting
Steady and continuous, in order to avoid producing the casting flaws such as oxide skin.Green compression strength in die cavity is maintained at 55Kpa, and green sand moisture is
2.7%, the compact rate of molding of green-sand and the ratio of water content are 8/1, then, are poured into a mould by cast gate, the aluminium alloy of molten
Material enters in the die cavity being full of by foam physical model from runner, and the aluminum alloy materials of high temperature makes foam physical model by vapour
Changing, the produced gas of vaporization is discharged from exhaust passage, behind the space that aluminum alloy materials liquation occupies foam physical model,
Obtain aluminum alloy materials foundry goods.
Post-processing step, cuts off the dead head on foundry goods, and foundry goods is carried out heat treatment.
Quickly cooling, is passed through cold air after drying at cast gate during foundry goods cooling, again extracts out, be again passed through after 4.5s
The cold air 4.5s of drying extracts out again, is the most repeatedly cooled to room temperature to casting workpiece.
The casting die obtained by embodiment 1-3 carries out the performance test of shear strength, fatigue strength and hardness.
Comparative example is that the trade mark that existing market is sold is: the aluminium alloy capability parameter of 43.
Test result is as shown in table 1.
Table 1 embodiment 1-3 and the performance test results of comparative example 1
As can be known from the above table, embodiment 1-3 of the present invention, front shearing stress >=180 τ/MPa, fatigue strength >=140 σ 1/MPa,
Hardness >=80HB, the every mechanical property of performance being different from comparative example 1-3 is more excellent so that by embodiment 1-3 of the present invention
Produce the casting workpiece quality cooling good, quick of the aluminium alloy lost foam of gained, the advantage such as pollution-free.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, under the premise without departing from the principles of the invention, it is also possible to make some improvement, these improvement also should be regarded as the present invention's
Protection domain.
Claims (7)
1. the casting technique quickly cooled down for aluminium alloy lost foam, it is characterised in that including:
(1) preparation process, makes foam physical model；
(2) core step is made, by foam physical model coating fireproof coating the driest, formation cast gate and runner on sandbox
After, fixing and bury this foam physical model underground with green-sand, then cast gate and exhaust passage are set, this green-sand include the grains of sand,
Water and the mixture of bonding agent；
(3) casting step, smelting aluminium alloy material, the aluminum alloy materials temperature of molten is controlled at predetermined temperature, by watering
Mouth carries out being poured in die cavity；
(4) post-processing step, cuts off the dead head on foundry goods, and foundry goods is carried out heat treatment；
(5) quickly cool down, be passed through cold air after drying at cast gate during foundry goods cooling, again extract out after 3-6s, be again passed through
The cold air 3-6s of drying extracts out again, is the most repeatedly cooled to room temperature to casting workpiece.
A kind of casting technique quickly cooled down for aluminium alloy lost foam the most according to claim 1, it is characterised in that: institute
Stating in casting step, the green compression strength in die cavity is maintained between 50-60Kpa, and green sand moisture is 2.6-2.8%.
A kind of casting technique quickly cooled down for aluminium alloy lost foam the most according to claim 1, it is characterised in that: institute
State the compact rate of molding of green-sand and the ratio of water content between 7-9.
A kind of casting technique quickly cooled down for aluminium alloy lost foam the most according to claim 1, it is characterised in that: institute
The temperature of this aluminum alloy materials stating molten controls between 650-680 DEG C.
A kind of casting technique quickly cooled down for aluminium alloy lost foam the most according to claim 1, it is characterised in that: institute
State and greensand mold is provided with Slag conglomeration agent, SiO in Slag conglomeration agent2Content be: 70-76%, Al2O3Content be: 8-14%.
A kind of casting technique quickly cooled down for aluminium alloy lost foam the most according to claim 1, it is characterised in that: institute
Stating the fireproof coating being coated in foam physical model is corundum.
A kind of casting technique quickly cooled down for aluminium alloy lost foam the most according to claim 1, it is characterised in that: institute
Stating the bonding agent in green-sand is Ludox.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114749600A (en) * | 2022-05-06 | 2022-07-15 | 广东翰维电子有限公司 | Casting process of bicycle frame sand box |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114749600A (en) * | 2022-05-06 | 2022-07-15 | 广东翰维电子有限公司 | Casting process of bicycle frame sand box |
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