CN105834362A - Evaporative pattern casting method and device for ultrasound vibration resin self-hardening sand - Google Patents
Evaporative pattern casting method and device for ultrasound vibration resin self-hardening sand Download PDFInfo
- Publication number
- CN105834362A CN105834362A CN201610325127.XA CN201610325127A CN105834362A CN 105834362 A CN105834362 A CN 105834362A CN 201610325127 A CN201610325127 A CN 201610325127A CN 105834362 A CN105834362 A CN 105834362A
- Authority
- CN
- China
- Prior art keywords
- sand
- sandbox
- resin self
- vibration
- foamed polystyrene
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/10—Compacting by jarring devices only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/08—Shaking, vibrating, or turning of moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/15—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using vacuum
Abstract
The invention provides an evaporative pattern casting method and device for ultrasound vibration resin self-hardening sand and belongs to the field of special precision casting. The method includes the steps that dry sand used in traditional evaporative pattern casting is changed into resin self-hardening sand, an ultrasonic wave generation system is introduced, a sine signal generated by an ultrasonic wave generator is converted into high-frequency mechanical vibration through an ultrasonic wave amplitude-variable bar connected with the ultrasonic wave generator, and high-frequency mechanical vibration acts on a sand box wall auxiliary resin self-hardening sand evaporative pattern modeling. The method includes the steps of manufacturing a foamed plastic model, painting a coating, performing sand box modeling, performing ultrasonic wave compaction, performing vacuumizing, burning the foamed plastic model through flames, performing vacuum negative-pressure pouring and performing the shakeout working procedure. By the adoption of the evaporative pattern casting method and device for ultrasound vibration resin self-hardening sand, the defects of sand crushing and recarburization can be overcome remarkably, the problems that most of castings are each of a dendrite structure, shrinkage and loosening are generated, and mechanical property is lower are solved, and the functions of grain refining, gas discharging and segregation reduction can be achieved.
Description
Technical field
The invention belongs to special precision casting field, be specifically related to a kind of supersonic vibration resin self-setting sand lost-foam casting method its
Device.
Background technology
Resin self-setting sand is used widely at China's casting industry, and process equipment technology has reached quite ripe level.Along with me
The development of state's mechanical industry, many producers all use resin self-setting sand to produce foundry goods, and lost foam casting is the green of binder free
Cleaning casting technique, the green cleaning production to realizing sand casting has realistic meaning.It addition, the selection of casting technique is very
Important, the quality of foundry goods should be ensured, meet dimensional accuracy and surface smoothness requirements, resin self-setting sand lost foam process again
In castings production, application is the most few at home.But resin self-setting sand technique and lost foam process in China's lathe, engineering machinery, make
The industries such as ship, automobile, electromotor, pump valve series products are widely applied.Resin self-setting sand lost foam casting is the most fully tied
Close the feature of resin self-setting sand and evaporative pattern.
It addition, the viscosity that the vibration disappearance mold casting method that tradition utilizes plain bumper to carry out vibrating can make metal bath reduces, stream
Dynamic property improves, and contributes to reducing misrun, the appearance of cold shut, but after pouring into a mould for thin-wall part, rate of cooling is fast, and crystallization time is short,
Make to vibrate the grain refining effect brought inconspicuous；Meanwhile, requiring to improve to the anti-seismic performance of coating, exciting force is excessive easily
Cause the defect such as crush, burning into sand.Even it is believed that strong vibration can add heavv alloy hole class defect, vibration can make needle-like altogether
Crystal silicon is roughened, and causes alloy property reduction etc. problem.
Summary of the invention
The problem that it is an object of the invention to there is prior art provides the lost foam casting side of a kind of supersonic vibration resin self-setting sand
Method and device thereof, it is possible to make the cast shape obtained the most accurate, dimensional accuracy is high, and surface smoothness is high, and crystal grain more refines,
Mechanical property is better.
For solving above-mentioned technical problem, the technical scheme is that the lost foam casting side of a kind of supersonic vibration resin self-setting sand
Method, comprises the steps:
(1) foamed polystyrene pattern operation is made: make foamed polystyrene pattern according to the shape of foundry goods；
(2) brushing paint operation: the outer surface of foamed polystyrene pattern is smeared the fireproof coating of good permeability and dries；
(3) box moulding synchronizes jolt ramming operation: opens supersonic generator, is allowed to ultrasonic activation, then by part tree
Fat self-hardening sand adds in sandbox as bed load layer, puts in sandbox by the foamed polystyrene pattern coating coating, then resin from hard
Sand inserts sandbox and by ultrasound wave dither consolidation, until filling up sandbox, is then shut off supersonic generator；
(4) evacuation operation: in the resin self-setting sand surface covered with plastic film encapsulation process of sandbox, then open vacuum pump pair
Sandbox carries out evacuation, and control vacuum is-0.06MPa～-0.04MPa；
(5) flame burns foamed polystyrene pattern operation: under resin self-setting sand condition of negative pressure, with gas gun, by rifle head flame pair
Quasi-rising head top, lights foamed polystyrene pattern from rising head and carries a small amount of oxygen, and in type, foamed polystyrene pattern fiercely burns, flue gas
Take away with vacuum system and discharge after vacuum pump processes, after treating that apperance burns till ghost, pour into a mould immediately；
(6) negative pressure of vacuum cast operation: in sandbox, pour into molten metal melt, now synchronize evacuation, evacuation and obtain
Gas treatment after discharge, it addition, when cast starts, open supersonic generator, it is achieved shake while the purpose watered；
(7) shakeout operation: keep certain time to fail to negative pressure after casting complete, closes vacuum pump, stops bleeding, and closes
Close supersonic generator and stop vibration, implement knockout and process, it is thus achieved that foundry goods.
Step (3) described resin self-setting sand is furan resin self curing sand, is that dry sand mixes with furane resins, wherein, and dry sand
Using the quartz sand of 80～100 mesh, the weight part ratio of dry sand and furane resins is 9:1.
The casting device of the lost-foam casting method of described supersonic vibration resin self-setting sand, including ultrasound wave generation system, disappearance
Die cast mold system and vacuum system, it is characterised in that concrete structure and annexation be:
Described ultrasound wave generation system is made up of supersonic generator and ultrasonic variable amplitude bar, supersonic generator and ultrasonic variable amplitude
Bar is connected, and ultrasonic variable amplitude bar directly contacts with sandbox,
Described Full mold casting mould system is by sandbox, resin self-setting sand, foamed polystyrene pattern, plastic sheeting and cup group
Becoming, described sandbox is rectangular-shaped, and bottom is equipped with vacuum system, and interior bottom is provided with ventilating interlayer,
Described vacuum system is made up of negative tube and vacuum pump, and described vacuum system passes through vacuum pump and the negative pressure being arranged on sandbox
Pipe is directly connected to,
Described ultrasound wave generation system is that the sinusoidal electric signals produced by supersonic generator is by coupled ultrasonic variable amplitude
Bar is changed into high-frequency mechanical vibration, high-frequency mechanical vibration act on sandbox wall assisted resin self-hardening sand lost foam modeling, in cast
Time, described ultrasonic activation also indirect action in metal bath, passes to metal bath by casting mold the energy of vibration, promotes
The motion of metal bath.
Know-why:
Use the ghost of ultrasonic activation resin self-setting sand+evaporative pattern without carbon technique to solve crush and carburetting defect, and use ultrasonic
Ripple vibration+vacuum negative pressure cast method is many in dendrite to solve cast structure, and shrinkage cavity is loosened, the problem that mechanical property is relatively low.Should
Method is to use supersonic vibration sandbox wall assisted resin self-hardening sand lost foam modeling, the most also assists vacuum negative pressure cast, it is achieved limit
Shake the purpose that limit waters.The lost-foam casting method of ultrasonic activation self-hardening sand is in metal bath by ultrasonic activation indirect action,
By casting mold, the energy of vibration is passed to metal bath, promote the motion of metal bath.It is different from ultrasonic activation directly to act on
In metal bath, promoted the motion of melt by the effect between vibration source and metal bath；Meanwhile, the frequency of ultrasonic activation
The high frequency characteristics of up to 20000HZ the most totally different in mechanical vibration only in the low-frequency vibration characteristic of about 100HZ.
The present invention has the prominent advantages that:
1., compared with tradition lost-foam casting method, use the carbon-free method of ghost of resin self-setting sand+evaporative pattern to can solve the problem that crush
With carburetting defect.
2., compared with tradition lost-foam casting method, use ultrasonic activation+vacuum negative pressure cast method many to solve cast structure
In dendrite, shrinkage cavity is loosened, the problem that mechanical property is relatively low.Increase ultrasound wave generation system, on the one hand, surpassing by high frequency
Acoustic vibration so that become between resin self-setting sand more consolidation and accelerate hardening；On the other hand, by by ultrasound wave
Vibrational energy conducts to metal bath indirectly, thus refines the crystal grain of metal bath to be cast and promote the motion of metal bath,
Thus improve the mechanical property of foundry goods.Ultrasonic activation resin self-setting sand lost-foam casting method is used can preferably to solve casting
Part tissue is many in dendrite, and shrinkage cavity is loosened, the problem that mechanical property is relatively low, more can realize crystal grain thinning, get rid of gas, reduction
Segregations etc. act on.
Accompanying drawing explanation
Fig. 1 is the structural representation of the lost foam casting device of supersonic vibration resin self-setting sand of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, technical scheme is described further.
As it is shown in figure 1, the lost foam casting device of supersonic vibration resin self-setting sand of the present invention, including ultrasound wave system
System, Full mold casting mould system and vacuum system, concrete structure and annexation be:
Described ultrasound wave generation system is made up of supersonic generator 1 and ultrasonic variable amplitude bar 2, described supersonic generator 1 with
Ultrasonic variable amplitude bar 2 is connected；Ultrasonic variable amplitude bar 2 contacts with sandbox 3.
Described Full mold casting mould system is by sandbox 3, resin self-setting sand 4, foamed polystyrene pattern 5, plastic sheeting 6 and waters
Cup 7 forms, and described sandbox 3 is rectangular-shaped, and bottom is equipped with vacuum system, and interior bottom is provided with ventilating interlayer 8.
Described vacuum system is made up of negative tube 9 and vacuum pump 10, and described vacuum system is passed through vacuum pump 10 and is arranged on sandbox
Negative tube 9 on 3 is directly connected to.
Ultrasound wave generation system of the present invention is that the sinusoidal electric signals produced by supersonic generator 1 is surpassed by coupled
Sound wave horn 2 is changed into high-frequency mechanical vibration, high-frequency mechanical vibration act on sandbox wall assisted resin self-hardening sand 4 evaporative pattern
Moulding, when cast, described ultrasonic activation also indirect action, in metal bath, passes to gold by casting mold the energy of vibration
Belong to melt, promote the motion of metal bath.
Embodiment 1
One of the lost-foam casting method of supersonic vibration resin self-setting sand of the present invention is applied to the example of aluminium alloy casting,
Comprise the steps:
Open supersonic generator 1, occur ultrasonic activation to be changed into height supersonic generator 1 by ultrasonic variable amplitude bar 2
Then mixed for part 80～100 mesh resin self-setting sands 4 are added as bed load layer in sandbox 3, by foam by mechanical vibration frequently
Sandbox 3 put into by plastic pattern 5, then adds resin self-setting sand 4, simultaneously ultrasonic activation sandbox wall auxiliary in sandbox 3
Resin self-setting sand 4 lost foam modeling, at resin self-setting sand 4 surface covered with plastic film 6 after filling up, opens vacuum pump 10 and takes out
Vacuum, vacuum is-0.05MPa, then puts cup 7, under resin self-setting sand 4 condition of negative pressure, with gas gun,
Rifle head flame is directed at rising head top, lights foamed polystyrene pattern 5 from rising head and carry a small amount of oxygen, foamed polystyrene pattern in type
5 fiercely burn, and flue gas is taken away with vacuum system and discharged after vacuum pump 10 processes, and after treating that apperance burns till ghost, will pass through
Refine, rotten after, melted ZL 101 alloy when temperature reaches 750 DEG C pours in sandbox 3；After pouring into the amount determined,
Keep certain time to fail to negative pressure, close vacuum pump 10, stop bleeding, close supersonic generator 1 and stop vibration,
Implement knockout to process, it is thus achieved that foundry goods.Wherein, during cast, need to synchronize evacuation, after the gas treatment being pumped
Discharge.It addition, when cast starts, open supersonic generator 1, the ultrasonic activation of generation can indirect action melt in metal
Body, passes to metal bath by casting mold the energy of vibration, promotes the motion of metal bath, it is achieved shake while the purpose watered.
Finally by Metallographic Analysis, tissue crystal grain refinement, dendrite major part fragmentation, shrinkage cavity is loose to be significantly reduced, and performance improves.
Claims (3)
1. the lost-foam casting method of a supersonic vibration resin self-setting sand, it is characterised in that comprise the steps:
(1) foamed polystyrene pattern operation is made: make foamed polystyrene pattern according to the shape of foundry goods；
(2) brushing paint operation: the outer surface of foamed polystyrene pattern is smeared the fireproof coating of good permeability and dries；
(3) box moulding synchronizes jolt ramming operation: opens supersonic generator, is allowed to ultrasonic activation, then by part tree
Fat self-hardening sand adds in sandbox as bed load layer, puts in sandbox by the foamed polystyrene pattern coating coating, then resin from hard
Sand inserts sandbox and by ultrasound wave dither consolidation, until filling up sandbox, is then shut off supersonic generator；
(4) evacuation operation: in the resin self-setting sand surface covered with plastic film encapsulation process of sandbox, then open vacuum pump pair
Sandbox carries out evacuation, and control vacuum is-0.06MPa～-0.04MPa；
(5) flame burns foamed polystyrene pattern operation: under resin self-setting sand condition of negative pressure, with gas gun, by rifle head flame pair
Quasi-rising head top, lights foamed polystyrene pattern from rising head and carries a small amount of oxygen, and in type, foamed polystyrene pattern fiercely burns, flue gas
Take away with vacuum system and discharge after vacuum pump processes, after treating that apperance burns till ghost, pour into a mould immediately；
(6) negative pressure of vacuum cast operation: in sandbox, pour into molten metal melt, now synchronize evacuation, evacuation and obtain
Gas treatment after discharge, it addition, when cast starts, open supersonic generator, it is achieved shake while the purpose watered；
(7) shakeout operation: keep certain time to fail to negative pressure after casting complete, closes vacuum pump, stops bleeding, and closes
Close supersonic generator and stop vibration, implement knockout and process, it is thus achieved that foundry goods.
The lost-foam casting method of supersonic vibration resin self-setting sand the most according to claim 1, it is characterised in that: step (3)
Described resin self-setting sand is furan resin self curing sand, is that dry sand mixes with furane resins, and wherein, dry sand uses 80～100
The weight part ratio of purpose quartz sand, dry sand and furane resins is 9:1.
3. it is applicable to a casting device for the lost-foam casting method of supersonic vibration resin self-setting sand described in claim 1, bag
Include ultrasound wave generation system, Full mold casting mould system and vacuum system, it is characterised in that concrete structure and annexation
For:
Described ultrasound wave generation system is made up of supersonic generator and ultrasonic variable amplitude bar, supersonic generator and ultrasonic variable amplitude
Bar is connected, and ultrasonic variable amplitude bar directly contacts with sandbox,
Described Full mold casting mould system is by sandbox, resin self-setting sand, foamed polystyrene pattern, plastic sheeting and cup group
Becoming, described sandbox is rectangular-shaped, and bottom is equipped with vacuum system, and interior bottom is provided with ventilating interlayer,
Described vacuum system is made up of negative tube and vacuum pump, and described vacuum system passes through vacuum pump and the negative pressure being arranged on sandbox
Pipe is directly connected to,
Described ultrasound wave generation system is that the sinusoidal electric signals produced by supersonic generator is by coupled ultrasonic variable amplitude
Bar is changed into high-frequency mechanical vibration, high-frequency mechanical vibration act on sandbox wall assisted resin self-hardening sand lost foam modeling, in cast
Time, described ultrasonic activation also indirect action in metal bath, passes to metal bath by casting mold the energy of vibration, promotes
The motion of metal bath.
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| CN201610325127.XA CN105834362B (en) | 2016-05-16 | 2016-05-16 | The lost-foam casting method of ultrasonic vibration resin self-setting sand |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107470595A (en) * | 2017-09-08 | 2017-12-15 | 辽宁华岳精工股份有限公司 | Power ultrasonic device and method for device for sand coated iron mould production line casting mold |
| CN107498000A (en) * | 2017-09-08 | 2017-12-22 | 大连理工大学 | The device and method of sprue cup is ultrasonically treated in metal casting process |
| CN107931578A (en) * | 2017-12-25 | 2018-04-20 | 芜湖市鸿坤汽车零部件有限公司 | A kind of automobile metal accessory Casting Equipment |
| CN107931579A (en) * | 2017-12-25 | 2018-04-20 | 芜湖市鸿坤汽车零部件有限公司 | A kind of casting mould vibrating device |
| CN108044058A (en) * | 2018-02-11 | 2018-05-18 | 江西亿丰精密铸造有限公司 | Dispellable mould casting sandbox air flue clears up system easy to assemble |
| CN110252948A (en) * | 2019-06-27 | 2019-09-20 | 共享装备股份有限公司 | A kind of evaporative pattern is first burnt pours casting method afterwards |
| CN110280720A (en) * | 2019-07-30 | 2019-09-27 | 张翔 | A kind of lost-foam casting method |
| CN111604479A (en) * | 2020-06-04 | 2020-09-01 | 黄剑 | Sand box structure for lost foam casting |
| CN113084081A (en) * | 2021-03-31 | 2021-07-09 | 苏州市兴业化工有限公司 | Rapid molding method of self-hardening furan resin for casting |
| CN113333676A (en) * | 2021-05-31 | 2021-09-03 | 华中科技大学 | Ultrasonic-assisted device for lost foam casting of magnesium-aluminum bimetal casting and application |
| CN115592072A (en) * | 2022-12-13 | 2023-01-13 | 衡水中裕铁信装备工程有限公司（Cn） | Composite casting method of hinge beam casting |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107470595A (en) * | 2017-09-08 | 2017-12-15 | 辽宁华岳精工股份有限公司 | Power ultrasonic device and method for device for sand coated iron mould production line casting mold |
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| CN107931579A (en) * | 2017-12-25 | 2018-04-20 | 芜湖市鸿坤汽车零部件有限公司 | A kind of casting mould vibrating device |
| CN108044058A (en) * | 2018-02-11 | 2018-05-18 | 江西亿丰精密铸造有限公司 | Dispellable mould casting sandbox air flue clears up system easy to assemble |
| CN110252948A (en) * | 2019-06-27 | 2019-09-20 | 共享装备股份有限公司 | A kind of evaporative pattern is first burnt pours casting method afterwards |
| CN110280720A (en) * | 2019-07-30 | 2019-09-27 | 张翔 | A kind of lost-foam casting method |
| CN111604479A (en) * | 2020-06-04 | 2020-09-01 | 黄剑 | Sand box structure for lost foam casting |
| CN113084081A (en) * | 2021-03-31 | 2021-07-09 | 苏州市兴业化工有限公司 | Rapid molding method of self-hardening furan resin for casting |
| CN113333676A (en) * | 2021-05-31 | 2021-09-03 | 华中科技大学 | Ultrasonic-assisted device for lost foam casting of magnesium-aluminum bimetal casting and application |
| CN113333676B (en) * | 2021-05-31 | 2022-05-31 | 华中科技大学 | Ultrasonic-assisted device for lost foam casting of magnesium-aluminum bimetal casting and application |
| CN115592072A (en) * | 2022-12-13 | 2023-01-13 | 衡水中裕铁信装备工程有限公司（Cn） | Composite casting method of hinge beam casting |
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