CN106694805A - Process for increasing evanescent mode casting engine cylinder yield - Google Patents
Process for increasing evanescent mode casting engine cylinder yield Download PDFInfo
- Publication number
- CN106694805A CN106694805A CN201611149843.3A CN201611149843A CN106694805A CN 106694805 A CN106694805 A CN 106694805A CN 201611149843 A CN201611149843 A CN 201611149843A CN 106694805 A CN106694805 A CN 106694805A
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- China
- Prior art keywords
- casting
- engine cylinder
- sandbox
- cylinder block
- lost 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
- 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
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a process for increasing an evanescent mode casting engine cylinder yield. The process comprises the steps of: mode production, combination, coating, forming, shaping, pouring, taking, detection and the like. The process for increasing the evanescent mode casting engine cylinder yield adopts a foam model produced by foamable methyl methacrylate and styrene copolymerized resin beads to increase the casting yield, and uses a sealing film and a vacuum pump for exhausting a sand box in vacuum to form negative pressure to increase viscosity between dry sand, so that the uniform feeding of pouring liquid is guaranteed, meanwhile, the gas discharge is facilitated, and the casting integrity is improved; after the casting is finished, a vacuum air extracting device continues air extraction to keep the vacuum by 200-300 s, so that the pouring stability and the casting forming yield are guaranteed to realize the advantages of reasonable ratio, simple operation process and high reliability; and the process is higher in innovativeness, practicability and utility value.
Description
Technical field
The present invention relates to casting technology field, and in particular to a kind of work of raising yield of lost foam casting of engine cylinder block
Skill.
Background technology
Lost foam casting is foam mould using the cavityless casting of bindless dry sand combination vacuum pumping technology, be by with
The similar bubbles model of casting dimension shape is bonded and is combined into model cluster, after brushing fireproof coating and drying, is embedded in drystone sand
Middle vibration molding, pours into a mould under negative pressure, model is gasified, and liquid metals occupies modal position, and casting is formed after solidification cooling
Novel casting method, compared with conventional casting technologies, lost foam casting has following features, casting quality is good, low cost, material not
Limit, size all preferably, size, high precision, any surface finish, reduce cleaning, saving machine adds, internal flaw greatly reduces, dense structure,
Extensive and production in enormous quantities, automatic assembly line life environmental protection are capable of achieving, operating environment can be substantially improved, work is reduced by force
Degree, reduction energy resource consumption, but because evaporative pattern is embedded in drystone sand, quartz sand is not fixed easily by vibrations, is easily caused
In casting process, mould walls husky or fixation of collapsing is paid no attention to, and the internal gas for producing is difficult to exclude, when being molded casting, its surface
Out-of-flatness, causes product defects to be scrapped, and influences the yield rate of engine cylinder-body, and the technique of evaporative pattern is also to be improved, to this I
Release it is a kind of improve yield of lost foam casting of engine cylinder block technique.
The content of the invention
To overcome the deficiencies in the prior art, the invention discloses a kind of raising yield of lost foam casting of engine cylinder block
Technique.
The present invention is adopted the following technical scheme that to achieve the above object：
The present invention proposes a kind of technique for improving yield of lost foam casting of engine cylinder block, comprises the following steps：
S1, molding, are provided with the size shape identical foam plastic that composition and casting are bonded with the foam grains of sand in sandbox
Material mould, using expandability methyl methacrylate and styrene copolymerized resin bead, by expandability methyl methacrylate and benzene
Ethylene copolymer bead share is according to (75-90%：10-25%) foaming is carried out in ratio injection steam foaming machine；
S2, combination, bonding is combined with dead head model by the foamed model being molded, and forms engine block mold cluster；
S3, coating, model cluster special coating is coated by the method soaked, and is coated the model cluster for completing and is existed
40-55 DEG C is carried out drying treatment by apparatus for drying, and coating layer thickness is controlled in 0.8-2.2mm, according to Diesel Engine Cylinder Block Castings chi
Little progress row thickness control, is obtained lost foam pattern；
S4, shaping, lost foam pattern are put into dry sand are filled in sandbox, while carrying out sandbox pumping and shake table shake
It is dynamic, dry sand is filled into sandbox inner chamber gas and evacuate and consolidation, sandbox surface is sealed using diaphragm seal, the pumping in sandbox
Device carries out vacuum suction, increases the adhesive between sand grains；
S5, sizing, lost foam pattern is removed using heating froth breaking capacity reducing, shell molding is completed, the disappearance with shell
Mould model adds heating furnace to be heated；
S6, cast, sandbox is arranged on bradyseism machine, and after cast starts, bradyseism machine is opened and slowly shaken, and is poured into
Evaporative pattern 9/10ths when, stop concussion, reduce poring rate until be poured, wait casting shaping cooling；
S7, pickup, after cooling is finished, casting are separated from sandbox, and the Diesel Engine Cylinder Block Castings isolated are with dry sand certainly
So separate, obtain Diesel Engine Cylinder Block Castings and dry sand, it is reusable after dry sand treatment.
Diesel Engine Cylinder Block Castings are carried out useless calculating of leak, stomata, cracking, scab and work and detected by S8, detection, are depicted as
Table, as with reference to contrast.
Preferably, after the cast is persistently poured into a mould using the pouring type of slow speed, and running castings are finished, vacuum suction
Device is persistently evacuated maintenance vacuum 200-300s.
Preferably, the foamed model carries out monoblock type dip-coating material with the model cluster that dead head model is combined.
Preferably, the expandability methyl methacrylate uses vacuum pre expansion with styrene copolymerized resin bead, sends out
Aeration-drying is carried out after bubble.
Compared with prior art, the beneficial effects of the invention are as follows：The raising yield of lost foam casting of engine cylinder block
Technique, the bubbles model being made of expandability methyl methacrylate and styrene copolymerized resin bead, bubbles model burning
Carbon residual afterwards in casting is few, increases casting yield, and foamed model passes through monoblock type dip-coating material, it is ensured that foamed mould walls
Smoothness, prevent because surface coating inequality cause casting produce it is bad, vacuum is carried out to sandbox by diaphragm seal and vavuum pump
Pumping, forms negative pressure, increases the viscosity between dry sand, prevents mould walls from the sand that collapses occur, and causes casting to be scrapped, and is adopted in casting process
Persistently poured into a mould with the pouring type of slow speed, the device is slowly shaken in casting process using bradyseism machine, it is ensured that cast
Liquid is even into while being excluded beneficial to gas, the integrality of increase casting, after casting mold is finished, vacuum suction device is persistently taken out
Gas maintains vacuum 200-300s, it is ensured that pouring stability and the yield of casting shaping.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with specific embodiment, to this
Invention is further elaborated.The specific embodiments described herein are merely illustrative of the present invention, is not used to limit
The present invention.
Embodiment 1
A kind of technique for improving yield of lost foam casting of engine cylinder block, specifically includes following steps：
S1, molding, are provided with the size shape identical foam plastic that composition and casting are bonded with the foam grains of sand in sandbox
Material mould, using expandability methyl methacrylate and styrene copolymerized resin bead, by expandability methyl methacrylate and benzene
Ethylene copolymer bead share is according to 85%：Foaming is carried out in 15% ratio injection steam foaming machine；
S2, combination, bonding is combined with dead head model by the foamed model being molded, and forms engine block mold cluster；
S3, coating, model cluster special coating is coated by the method soaked, and coats the model cluster for completing 50
DEG C dry treatment by apparatus for drying, coating layer thickness is controlled in 2mm, and thickness control is carried out according to Diesel Engine Cylinder Block Castings size
System, is obtained lost foam pattern；
S4, shaping, lost foam pattern are put into dry sand are filled in sandbox, while carrying out sandbox pumping and shake table shake
It is dynamic, dry sand is filled into sandbox inner chamber gas and evacuate and consolidation, sandbox surface is sealed using diaphragm seal, the pumping in sandbox
Device carries out vacuum suction, increases the adhesive between sand grains；
S5, sizing, lost foam pattern is removed using heating froth breaking capacity reducing, shell molding is completed, the disappearance with shell
Mould model adds heating furnace to be heated；
S6, cast, sandbox is arranged on bradyseism machine, and after cast starts, bradyseism machine is opened and slowly shaken, and is poured into
Evaporative pattern 9/10ths when, stop concussion, reduce poring rate until be poured, be poured rear vavuum pump vacuum drawn
260s, waits casting shaping cooling；
S7, pickup, after cooling is finished, casting are separated from sandbox, and the Diesel Engine Cylinder Block Castings isolated are with dry sand certainly
So separate, obtain Diesel Engine Cylinder Block Castings and dry sand, it is reusable after dry sand treatment.
Diesel Engine Cylinder Block Castings are carried out useless calculating of leak, stomata, cracking, scab and work and detected by S8, detection, are depicted as
Table, as with reference to contrast.
Embodiment 2
A kind of technique for improving yield of lost foam casting of engine cylinder block, specifically includes following steps：
S1, molding, are provided with the size shape identical foam plastic that composition and casting are bonded with the foam grains of sand in sandbox
Material mould, using expandability methyl methacrylate and styrene copolymerized resin bead, by expandability methyl methacrylate and benzene
Ethylene copolymer bead share is according to 90%：Foaming is carried out in 10% ratio injection steam foaming machine；
S2, combination, bonding is combined with dead head model by the foamed model being molded, and forms engine block mold cluster；
S3, coating, model cluster special coating is coated by the method soaked, and coats the model cluster for completing 45
DEG C dry treatment by apparatus for drying, coating layer thickness is controlled in 1.8mm, and thickness is carried out according to Diesel Engine Cylinder Block Castings size
Control, is obtained lost foam pattern；
S4, shaping, lost foam pattern are put into dry sand are filled in sandbox, while carrying out sandbox pumping and shake table shake
It is dynamic, dry sand is filled into sandbox inner chamber gas and evacuate and consolidation, sandbox surface is sealed using diaphragm seal, the pumping in sandbox
Device carries out vacuum suction, increases the adhesive between sand grains；
S5, sizing, lost foam pattern is removed using heating froth breaking capacity reducing, shell molding is completed, the disappearance with shell
Mould model adds heating furnace to be heated；
S6, cast, sandbox is arranged on bradyseism machine, and after cast starts, bradyseism machine is opened and slowly shaken, and is poured into
Evaporative pattern 9/10ths when, stop concussion, reduce poring rate until be poured, be poured rear vavuum pump vacuum drawn
300s, waits casting shaping cooling；
S7, pickup, after cooling is finished, casting are separated from sandbox, and the Diesel Engine Cylinder Block Castings isolated are with dry sand certainly
So separate, obtain Diesel Engine Cylinder Block Castings and dry sand, it is reusable after dry sand treatment.
Diesel Engine Cylinder Block Castings are carried out useless calculating of leak, stomata, cracking, scab and work and detected by S8, detection, are depicted as
Table, as with reference to contrast.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding can carry out various changes, modification, replacement to these embodiments without departing from the principles and spirit of the present invention
And modification, the scope of the present invention be defined by the appended.
Claims (4)
1. it is a kind of improve yield of lost foam casting of engine cylinder block technique, it is characterised in that：Comprise the following steps：
S1, molding, are provided with the size shape identical foam mould that composition and casting are bonded with the foam grains of sand in sandbox,
Using expandability methyl methacrylate and styrene copolymerized resin bead, expandability methyl methacrylate and styrene are total to
Poly resin bead share is according to (75-90%：10-25%) foaming is carried out in ratio injection steam foaming machine；
S2, combination, bonding is combined with dead head model by the foamed model being molded, and forms engine block mold cluster；
S3, coating, model cluster special coating is coated by the method soaked, and coats the model cluster for completing in 40-55
DEG C dry treatment by apparatus for drying, coating layer thickness is controlled in 0.8-2.2mm, carried out according to Diesel Engine Cylinder Block Castings size
Thickness control, is obtained lost foam pattern；
S4, shaping, lost foam pattern are put into dry sand are filled in sandbox, while sandbox pumping and shake table vibrations are carried out,
Make dry sand be filled into sandbox inner chamber gas to evacuate and consolidation, sandbox surface is sealed using diaphragm seal, the pumping dress in sandbox
Putting carries out vacuum suction, increases the adhesive between sand grains；
S5, sizing, lost foam pattern is removed using heating froth breaking capacity reducing, shell molding is completed, the evaporative pattern mould with shell
Type adds heating furnace to be heated；
S6, cast, sandbox is arranged on bradyseism machine, and after cast starts, bradyseism machine is opened and slowly shaken, and is poured into disappearance
Mould 9/10ths when, stop concussion, reduce poring rate until be poured, wait casting shaping cooling；
S7, pickup, after cooling is finished, casting are separated from sandbox, and the Diesel Engine Cylinder Block Castings isolated divide naturally with dry sand
Open, obtain Diesel Engine Cylinder Block Castings and dry sand, it is reusable after dry sand treatment.
Diesel Engine Cylinder Block Castings are carried out the useless detection of leak, stomata, cracking, scab and work by S8, detection, table are depicted as, as ginseng
According to contrast.
2. it is according to claim 1 it is a kind of improve yield of lost foam casting of engine cylinder block technique it is characterized in that：
After the cast is persistently poured into a mould using the pouring type of slow speed, and running castings are finished, vacuum suction device is persistently evacuated dimension
Hold vacuum 200s-300s.
3. it is according to claim 1 it is a kind of improve yield of lost foam casting of engine cylinder block technique it is characterized in that：
The foamed model carries out monoblock type dip-coating material with the model cluster that dead head model is combined.
4. it is according to claim 1 it is a kind of improve yield of lost foam casting of engine cylinder block technique it is characterized in that：
The expandability methyl methacrylate uses vacuum pre expansion with styrene copolymerized resin bead, is aerated after foaming dry
It is dry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611149843.3A CN106694805A (en) | 2016-12-14 | 2016-12-14 | Process for increasing evanescent mode casting engine cylinder yield |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611149843.3A CN106694805A (en) | 2016-12-14 | 2016-12-14 | Process for increasing evanescent mode casting engine cylinder yield |
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| CN106694805A true CN106694805A (en) | 2017-05-24 |
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| CN201611149843.3A Pending CN106694805A (en) | 2016-12-14 | 2016-12-14 | Process for increasing evanescent mode casting engine cylinder yield |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107309389A (en) * | 2017-08-21 | 2017-11-03 | 安徽省含山县兴建铸造厂 | A kind of die treatment method for lifting damper casting property |
| CN111421109A (en) * | 2020-06-12 | 2020-07-17 | 广东峰华卓立科技股份有限公司 | Casting method for preparing sand mold shell based on 3D printing |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106238675A (en) * | 2016-07-30 | 2016-12-21 | 安徽全柴天和机械有限公司 | A kind of technique improving yield of lost foam casting of engine cylinder block |
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- 2016-12-14 CN CN201611149843.3A patent/CN106694805A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106238675A (en) * | 2016-07-30 | 2016-12-21 | 安徽全柴天和机械有限公司 | A kind of technique improving yield of lost foam casting of engine cylinder block |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107309389A (en) * | 2017-08-21 | 2017-11-03 | 安徽省含山县兴建铸造厂 | A kind of die treatment method for lifting damper casting property |
| CN111421109A (en) * | 2020-06-12 | 2020-07-17 | 广东峰华卓立科技股份有限公司 | Casting method for preparing sand mold shell based on 3D printing |
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Application publication date: 20170524 |
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