CN109434012A - A kind of lost foam casting process of high-mechanical property casting - Google Patents
A kind of lost foam casting process of high-mechanical property casting Download PDFInfo
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- CN109434012A CN109434012A CN201811651445.0A CN201811651445A CN109434012A CN 109434012 A CN109434012 A CN 109434012A CN 201811651445 A CN201811651445 A CN 201811651445A CN 109434012 A CN109434012 A CN 109434012A
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- casting
- sandbox
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- molten steel
- sand
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Classifications
-
- 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
- B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
- B22C7/023—Patterns made from expanded plastic materials
-
- 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
- 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
Abstract
The present invention provides a kind of lost foam casting process of high-mechanical property casting, includes the following steps: that molding, molding, filling moulding, negative pressure of vacuum, moulding by casting, casting takes out and handles, molding sand is handled；Wherein vibration processing is carried out in filling moulding and moulding by casting step.Casting technique of the present invention is simple to operation, cast structure uniform and delicate, the defects of cast-internal pore-free, loose and slag inclusion, to improve the qualification rate of casting, the mechanical strength of casting is also improved, its wearability, bend resistance ability etc. is made all to increase, since such handicraft product qualification rate is high, the production cost for thereby reducing enterprise, improves economic benefit.
Description
Technical field
The present invention relates to Technology of EPC field more particularly to a kind of lost foam casting works of high-mechanical property casting
Skill.
Background technique
Lost foam casting is the cavityless casting that foam mould uses bindless dry sand combination vacuum pumping technology.Specifically
Bubbles model bonding similar with casting dimension shape is combined into model cluster, after brushing fireproof coating and drying, is embedded in drystone
Vibration molding in sand, is poured under negative pressure, and model is made to gasify, and liquid metals occupies modal position, forms casting after solidification is cooling
The novel casting method of part.But existing lost foam casting process, there are labor intensity of workers height, energy consumption is serious, casting table
Face is coarse, and the problem of waste product easily occurs in casting bad mechanical property.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of shot-blasting machine demultiplexers.
To achieve the above object, present invention employs following technical solutions:
A kind of lost foam casting process of high-mechanical property casting, includes the following steps:
S1: molding: 0.016-0.0188cm3EPS finished foam plate entering to dry room is dried under 45-55 DEG C of environment, is then utilized
The cystosepiment of drying is carried out model cutting, engraving by intelligent foam carving cutting machine, is finally aided with manual amendment, completes finishing die
Type production；
S2: coating (shell processed): finished product model being placed on after drying 2-4 hours in 45-55 DEG C of drying chamber and taken out, and then utilizes spray
Painting machine sprayable refractory enters drying chamber hydrofuge after brushing one times spray coating powders whole on the outside of finished product model and dries, then will be after drying
Model take out carry out second of even application, painting, drying, coating work at least smear 3-5 times, refractory material with a thickness of
2-3 centimetres；
S3: filling moulding: placing simultaneously clamping on a vibration table for sandbox first, is laid with bed load in sandbox bottom and starts shake table
Jolt ramming, bed load is put into the finished product model of S2 step coating completion, is divided into back-up sand, and side back-up sand after jolt ramming with a thickness of 15-25 centimetres
Side is vibrated to guarantee back-up sand consolidation, and molding sand is uniformly filled to finished product model inner and outer surfaces and each position；Sandbox fill up after
Sandbox surface is sealed with plastic film, and is further filled and fixed with molding sand, finally with refractory mortar by tundish diaphragm and the inside
Running channel connection；
S4: negative pressure of vacuum: sandbox exhaust pipe is connect with negative pressure of vacuum system, and the valve opened between sandbox and baric systerm opens
Dynamic negative pressure system, the air in sandbox is taken away, guarantees that negative pressure intracavitary in sandbox reaches-0.04-- 0.08MPa, all are reached
Negative pressure system is closed after mark；
S5: moulding by casting: it is first that the smelting molten steel of needs is good, then start negative pressure system, by the vacuum cavitations in sandbox-
0.04-- 0.08MPa, by temperature in 1600-1650 DEG C of pouring molten steel in finished product model into sandbox, model vaporization disappears
It loses, completes metal replacement model；Using the form that slow-to-fast-is slow and is continuously poured during pouring operation, casting is avoided not
Foot；Every time after every case product casting, negative pressure system must be shut down after 2-4 minutes, and the time is appropriately extended in the big thick member in part, it is ensured that
The forming of product surface molten steel；
S6: casting takes out and handles: after completion to be cast 2-3 hours, sandbox is moved to molding sand processing inlet, by molding sand and
Product is poured out together, and product is hung and moves on to cooling on proprietary platform, and casting after cooling cuts away dead head, and cleaning surface applies
The bed of material is then placed in shot-blasting machine and carries out shotblasting processing, until surface is clean, then carries out slag, gas, hole repair welding, burr is beaten
Mill, heat examine shaping, complete post-processing, examine qualified storage through spectrometer；
S7: molding sand processing: the high temperature molding sand after casting enters cooling, removal of impurities, dedusting by the sand preparation equipment of starting
System processing, after processing, the molding sand of clean room temperature is prepared automatically into molding sand holding vessel for production next time；
Wherein, each pouring molten steel terminates, and starting dither system immediately makes molten steel receive high frequency micro vibration in cooling, shakes
Dynamic frequency is 120-170Hz, carries out high-frequency vibration and fills type and crystallization；Chassis vibration, vibration are then being carried out after the completion of high-frequency vibration
Dynamic frequency is 35-40Hz, carries out low frequency crystallization.
Preferably, the coating that S2 step uses is by zirconium English powder, the contour Wen Naicai powder of olive mountain flour and water based adhesive, swollen
The different fireproof coatings that profit agent etc. is configured to by the cast steel product of different materials, and refractory material need in blender into
Row can reach performance requirement up to stirring in 4-6 hours.
Preferably, model is after the drying of paint coatings several times in S2 step, and Yao Jinhang is examed piece by piece, and model must not become
Shape, coating must not have crack, peeling phenomenon, and if any such phenomenon, the reparation that should fill a vacancy in time is until qualified.
Preferably, during smelting molten steel, steel temperature samples when time is up, carries out spectroscopic elemental analysis, according to product requirement,
It carries out molten steel each element to be adjusted in place, finally resamples and seal up for safekeeping, after molten steel composition confirmation, to the further deoxidation of molten steel, remove
Slag treatment finally and notifies teams and groups personnel to carry out casting and prepare.
Compared with prior art, the invention has the benefit that casting technique is simple to operation, cast structure is uniformly thin
The defects of cause, cast-internal pore-free, loose and slag inclusion, to improve the qualification rate of casting, the machinery for also improving casting is strong
Degree, makes its wearability, bend resistance ability etc. all increase, and since such handicraft product qualification rate is high, thereby reduces enterprise
Production cost, improve economic benefit.
To make to have further understanding to the purpose of the present invention, construction, feature and its function, hereby cooperate embodiment detailed
It is described as follows.
A kind of lost foam casting process of high-mechanical property casting of one embodiment of the invention, includes the following steps:
S1: molding: 0.016-0.0188cm3EPS finished foam plate entering to dry room is dried under 45-55 DEG C of environment, is then utilized
The cystosepiment of drying is carried out model cutting, engraving by intelligent foam carving cutting machine, is finally aided with manual amendment, completes finishing die
Type production；The purpose is to: cast material is 1. dried, the intensity of material is increased.2. eliminating the internal stress of material, prevent model from producing
After deform.3. the coefficient of expansion of lightening material reduces product model change in size in production procedure from now on, cast product ruler
Very little precision improves.It is cut and is carved using cutting machine, energy 85% replaces manual operation, and can improve the dimensional accuracy of cast product, subtracts
Small error.
S2: coating (shell processed): finished product model being placed on after drying 2-4 hours in 45-55 DEG C of drying chamber and taken out, when drying
Model should be placed to appropriate location, guarantee that model must not deform, then utilize flush coater sprayable refractory, it will be outside finished product model
Side whole spray coating powder brush one times after enter drying chamber hydrofuge dry, then by after drying model take out carry out second of even application,
Painting, drying, coating work at least smear 3-5 times, refractory material with a thickness of 2-3 centimetres.
S3: filling moulding: placing simultaneously clamping on a vibration table for sandbox first, is laid with bed load in sandbox bottom and starts vibration
Dynamic platform jolt ramming, bed load is put into the finished product model of S2 step coating completion, is divided into back-up sand, and side after jolt ramming with a thickness of 15-25 centimetres
Back-up sand side is vibrated to guarantee back-up sand consolidation, and molding sand is uniformly filled to finished product model inner and outer surfaces and each position；Sandbox fills up
Sealed afterwards on sandbox surface with plastic film, and further with molding sand fill fix, finally with refractory mortar by tundish diaphragm with
The connection of the inside running channel.The specific steps of vibration molding include: that dry sand is added into sandbox, add being filled to for guarantee dry sand when sand
Position, is added bed load, and vibration ramming in sandbox first；It is put into model group, certain thickness dry sand is added, model group is buried
Enter to one third to half, then suitably vibrated, to promote dry sand to fill to mould impression；Finally fill up sandbox into
Row vibration, time of vibration is unsuitable too long, to guarantee that damaging and deforming do not occur in model, while guarantee dope layer do not fall off and
Cracking.Vertical single vibration is generally used for most casting, the casting more complicated for structure, it is contemplated that use unidirectional water
Flat vibration or two and three dimensions vibration.The size of oscillation intensity is very big on dry moulding influence, indicates to vibrate with vibration acceleration
Intensity.For the model group of general complexity, vibration acceleration is between 10 and 20.And amplitude is to influence model to keep certain
The important parameter of rigidity, lost foam casting amplitude is generally in 0.5-1mm.The selection of time of vibration should be in conjunction with casting and model group knot
Structure is selected, but generally time control is advisable in 1-5min.The time of vibration that bed load, model group are embedded to half simultaneously is wanted
It is short, 1-2min may be selected.Model group be wholly embedded into after time of vibration general control in 2-3min.
S4: negative pressure of vacuum: sandbox exhaust pipe is connect with negative pressure of vacuum system, opens the valve between sandbox and baric systerm
Door starting negative pressure system, the air in sandbox is taken away, guarantees in sandbox that intracavitary negative pressure reaches-0.04-- 0.08MPa, and one
Cut rear closing negative pressure system up to standard.
S5: moulding by casting: it is first that the smelting molten steel of needs is good, then start negative pressure system, by the vacuum cavitations in sandbox
In-0.04-- 0.08MPa, by temperature in 1600-1650 DEG C of pouring molten steel in finished product model into sandbox, model vaporization
It disappears, completes metal replacement model；Using the form that slow-to-fast-is slow and is continuously poured during pouring operation, casting is avoided not
Foot；Every time after every case product casting, negative pressure system must be shut down after 2-4 minutes, and the time is appropriately extended in the big thick member in part, it is ensured that
The forming of product surface molten steel.For different alloy materials, compared with sand casting, lost foam casting pouring temperature general control
It is being higher than 30-50 DEG C of sand casting temperature.The defects of pouring temperature is too low, and casting is easy to produce misrun, cold shut, elephant skin.It pours
The defects of note excessively high casting of temperature is easy to produce scab.When casting, make sure to keep in mind discontinuously to be poured, casting cold shut is easily caused to lack in this way
It falls into, liquid level stabilizing in tundish is kept when casting, keeps pouring head steady.The effect of negative pressure is to increase sand mold stiffness and strength, together
When be also the major measure for excluding model vaporizer.
S6: casting takes out and handles: after completion to be cast 2-3 hours, sandbox being moved to molding sand processing inlet, by type
Sand and product are poured out together, and product is hung and moves on to cooling on proprietary platform, and casting after cooling cuts away dead head, clear up table
Coating materials layer is then placed in shot-blasting machine and carries out shotblasting processing, until surface is clean, then carries out slag, gas, hole repair welding, hair
Thorn polishing, heat examine shaping, complete post-processing, examine qualified storage through spectrometer.
S7: molding sand processing: the high temperature molding sand after casting, by the sand preparation equipment of starting enter cooling, removal of impurities,
Dust pelletizing system processing, after processing, the molding sand of clean room temperature is prepared automatically into molding sand holding vessel for production next time.
Wherein, each pouring molten steel terminates, and starting dither system immediately makes molten steel receive high-frequency micro-vibration in cooling
Dynamic, vibration frequency 120-170Hz carries out high-frequency vibration and fills type and crystallization；Chassis vibration is then being carried out after the completion of high-frequency vibration
Dynamic, vibration frequency 35-40Hz carries out low frequency crystallization.
Preferably, the coating that S2 step uses is by zirconium English powder, the contour Wen Naicai powder of olive mountain flour and water based adhesive, swollen
The different fireproof coatings that profit agent etc. is configured to by the cast steel product of different materials, and refractory material need in blender into
Row can reach performance requirement up to stirring in 4-6 hours.Coating must have venting capability appropriate: decompose convenient for model vaporization
The gas of generation is drawn；Adsorb the ability of liquid: the liquid that Adsorption Model vaporization generates avoids being mixed in casting and generates bubble,
Influence casting quality；Higher intensity: can be such that model structure enhances, and avoid damaged when carrying and moulding；And certain guarantor
Warm heat-proof quality: softening, thawing, cracking and the decomposition of model will all absorb heat, this has cooling work to the forward position of molten steel
With, thus casting flaw common when misrun or cold shut can promote this kind of defect if dope layer has chilling action certainly
It is formed, if coating has certain thermal and insulating performance, is beneficial to prevent and generates this kind of defect.
Preferably, model is after the drying of paint coatings several times in S2 step, and Yao Jinhang is examed piece by piece, and model must not become
Shape, coating must not have crack, peeling phenomenon, and if any such phenomenon, the reparation that should fill a vacancy in time is until qualified.
Preferably, during smelting molten steel, steel temperature samples when time is up, carries out spectroscopic elemental analysis, according to product requirement,
It carries out molten steel each element to be adjusted in place, finally resamples and seal up for safekeeping, after molten steel composition confirmation, to the further deoxidation of molten steel, remove
Slag treatment finally and notifies teams and groups personnel to carry out casting and prepare.
From the above mentioned, a kind of evaporative pattern production technology of high mechanical strength casting of the invention, casting technique are simply easily grasped
It the defects of work, cast structure uniform and delicate, cast-internal pore-free, loose and slag inclusion, to improve the qualification rate of casting, also mentions
The high mechanical strength of casting, makes its wearability, bend resistance ability etc. all increase, due to such handicraft product qualification rate
Height thereby reduces the production cost of enterprise, improves economic benefit.
The present invention is described by above-mentioned related embodiment, however above-described embodiment is only to implement example of the invention.
It must be noted that the embodiment disclosed is not limiting as the scope of the present invention.On the contrary, do not depart from spirit of the invention and
It is changed and retouched made by range, belongs to scope of patent protection of the invention.
Claims (4)
1. a kind of lost foam casting process of high-mechanical property casting, characterized by the following steps:
S1: molding: 0.016-0.0188cm3EPS finished foam plate entering to dry room is dried under 45-55 DEG C of environment, is then utilized
The cystosepiment of drying is carried out model cutting, engraving by intelligent foam carving cutting machine, is finally aided with manual amendment, completes finishing die
Type production；
S2: coating (shell processed): finished product model being placed on after drying 2-4 hours in 45-55 DEG C of drying chamber and taken out, and then utilizes spray
Painting machine sprayable refractory enters drying chamber hydrofuge after brushing one times spray coating powders whole on the outside of finished product model and dries, then will be after drying
Model take out carry out second of even application, painting, drying, coating work at least smear 3-5 times, refractory material with a thickness of
2-3 centimetres；
S3: filling moulding: placing simultaneously clamping on a vibration table for sandbox first, is laid with bed load in sandbox bottom and starts shake table
Jolt ramming, bed load is put into the finished product model of S2 step coating completion, is divided into back-up sand, and side back-up sand after jolt ramming with a thickness of 15-25 centimetres
Side is vibrated to guarantee back-up sand consolidation, and molding sand is uniformly filled to finished product model inner and outer surfaces and each position；Sandbox fill up after
Sandbox surface is sealed with plastic film, and is further filled and fixed with molding sand, finally with refractory mortar by tundish diaphragm and the inside
Running channel connection；
S4: negative pressure of vacuum: sandbox exhaust pipe is connect with negative pressure of vacuum system, and the valve opened between sandbox and baric systerm opens
Dynamic negative pressure system, the air in sandbox is taken away, guarantees that negative pressure intracavitary in sandbox reaches-0.04-- 0.08MPa, all are reached
Negative pressure system is closed after mark；
S5: moulding by casting: it is first that the smelting molten steel of needs is good, then start negative pressure system, by the vacuum cavitations in sandbox-
0.04-- 0.08MPa, by temperature in 1600-1650 DEG C of pouring molten steel in finished product model into sandbox, model vaporization disappears
It loses, completes metal replacement model；Using the form that slow-to-fast-is slow and is continuously poured during pouring operation, casting is avoided not
Foot；Every time after every case product casting, negative pressure system must be shut down after 2-4 minutes, and the time is appropriately extended in the big thick member in part, it is ensured that
The forming of product surface molten steel；
S6: casting takes out and handles: after completion to be cast 2-3 hours, sandbox is moved to molding sand processing inlet, by molding sand and
Product is poured out together, and product is hung and moves on to cooling on proprietary platform, and casting after cooling cuts away dead head, and cleaning surface applies
The bed of material is then placed in shot-blasting machine and carries out shotblasting processing, until surface is clean, then carries out slag, gas, hole repair welding, burr is beaten
Mill, heat examine shaping, complete post-processing, examine qualified storage through spectrometer；
S7: molding sand processing: the high temperature molding sand after casting enters cooling, removal of impurities, dedusting by the sand preparation equipment of starting
System processing, after processing, the molding sand of clean room temperature is prepared automatically into molding sand holding vessel for production next time；
Wherein, each pouring molten steel terminates, and starting dither system immediately makes molten steel receive high frequency micro vibration in cooling, shakes
Dynamic frequency is 120-170Hz, carries out high-frequency vibration and fills type and crystallization；Chassis vibration, vibration are then being carried out after the completion of high-frequency vibration
Dynamic frequency is 35-40Hz, carries out low frequency crystallization.
2. the lost foam casting process of high-mechanical property casting as described in claim 1, it is characterised in that: what S2 step used
Coating is to produce zirconium English powder, the contour Wen Naicai powder of olive mountain flour and water based adhesive, swelling agent etc. by the cast steel of different materials
The different fireproof coatings that product are configured to, and refractory material needs to carry out in blender to reach up to stirring in 4-6 hours
To performance requirement.
3. the lost foam casting process of high-mechanical property casting as described in claim 1, it is characterised in that: model in S2 step
After the drying of paint coatings several times, Yao Jinhang is examed piece by piece, and model must not deform, and coating must not have crack, peeling phenomenon, such as
There is such phenomenon, the reparation that should fill a vacancy in time is until qualified.
4. the lost foam casting process of high-mechanical property casting as described in claim 1, it is characterised in that: in smelting molten steel mistake
Cheng Zhong, steel temperature sample when time is up, carry out spectroscopic elemental analysis, according to product requirement, carry out molten steel each element and are adjusted in place, finally
It resamples and seals up for safekeeping, after molten steel composition confirmation, to the further deoxidation of molten steel, remove Slag treatment, finally and notify teams and groups that personnel do
Good casting prepares.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811651445.0A CN109434012A (en) | 2018-12-31 | 2018-12-31 | A kind of lost foam casting process of high-mechanical property casting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811651445.0A CN109434012A (en) | 2018-12-31 | 2018-12-31 | A kind of lost foam casting process of high-mechanical property casting |
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| CN109434012A true CN109434012A (en) | 2019-03-08 |
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| CN201811651445.0A Pending CN109434012A (en) | 2018-12-31 | 2018-12-31 | A kind of lost foam casting process of high-mechanical property casting |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112846680A (en) * | 2021-02-20 | 2021-05-28 | 洛阳佳会机械科技有限公司 | Manufacturing method of variable multi-purpose mould for foam plastic molding and foam plastic molding process |
| CN113714465A (en) * | 2020-12-25 | 2021-11-30 | 宁夏军浩机械设备制造有限公司 | Lost foam casting mold and casting method |
| CN114147176A (en) * | 2021-11-24 | 2022-03-08 | 芜湖泓鹄材料技术有限公司 | Stamping die blank holder molding process |
| CN115464342A (en) * | 2022-09-26 | 2022-12-13 | 华能(浙江)能源开发有限公司玉环分公司 | Manufacturing method of long-service-life grinding disc center cover for coal mill |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113714465A (en) * | 2020-12-25 | 2021-11-30 | 宁夏军浩机械设备制造有限公司 | Lost foam casting mold and casting method |
| CN112846680A (en) * | 2021-02-20 | 2021-05-28 | 洛阳佳会机械科技有限公司 | Manufacturing method of variable multi-purpose mould for foam plastic molding and foam plastic molding process |
| CN112846680B (en) * | 2021-02-20 | 2023-08-29 | 洛阳佳会机械科技有限公司 | Manufacturing method of foam plastic molding variable multipurpose mold and foam plastic molding process |
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| CN114147176B (en) * | 2021-11-24 | 2023-05-26 | 芜湖泓鹄材料技术有限公司 | Edge pressing ring molding process of stamping die |
| CN115464342A (en) * | 2022-09-26 | 2022-12-13 | 华能(浙江)能源开发有限公司玉环分公司 | Manufacturing method of long-service-life grinding disc center cover for coal mill |
| CN115464342B (en) * | 2022-09-26 | 2024-03-26 | 华能(浙江)能源开发有限公司玉环分公司 | Manufacturing method of long-service-life millstone center cover for coal mill |
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