CN100446893C - Lost foam foundry method for engine cylinder - Google Patents
Lost foam foundry method for engine cylinder Download PDFInfo
- Publication number
- CN100446893C CN100446893C CNB2003101211162A CN200310121116A CN100446893C CN 100446893 C CN100446893 C CN 100446893C CN B2003101211162 A CNB2003101211162 A CN B2003101211162A CN 200310121116 A CN200310121116 A CN 200310121116A CN 100446893 C CN100446893 C CN 100446893C
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- Prior art keywords
- model
- sand
- engine cylinder
- sandbox
- shell
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000006260 foam Substances 0.000 title 1
- 239000004576 sand Substances 0.000 claims abstract description 27
- 244000035744 Hura crepitans Species 0.000 claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 5
- 230000008034 disappearance Effects 0.000 claims description 20
- 238000010114 lost-foam casting Methods 0.000 claims description 11
- 238000009415 formwork Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 5
- 238000012856 packing Methods 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 238000007528 sand casting Methods 0.000 claims description 4
- 239000011258 core-shell material Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000005266 casting Methods 0.000 abstract description 15
- 238000007596 consolidation process Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000006261 foam material Substances 0.000 abstract 1
- 238000005242 forging Methods 0.000 abstract 1
- 239000002985 plastic film Substances 0.000 abstract 1
- 229920006255 plastic film Polymers 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 241000406668 Loxodonta cyclotis Species 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 238000002309 gasification Methods 0.000 description 3
- 239000004793 Polystyrene Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000000476 body water Anatomy 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- -1 vibration ramming Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Mold Materials And Core Materials (AREA)
- Casting Devices For Molds (AREA)
Abstract
The present invention relates to an expendable pattern forging method of an engine cylinder body. The present invention comprises the technological steps that a model of an expendable pattern, which is made of foam material and is the same as a casting, is arranged in a sand box, sand is pre-filled in a hollow cavity of the middle part of the model, then, the pre-vibration consolidation is carried out, and finally, the pre-vacuumization is carried out. A model shell is singly manufactured in the middle part of the model of the expendable pattern, and is combined to a whole model. Dry sand is filled in the sand box for vibration consolidation, the top of the sand box is covered with a plastic film, the vacuumization is carried out in the sank box, and melted metal is cast to the area of the model of the expendable pattern until the casting completely solidifies. Before the model of the expendable pattern is arranged in the sand box, the method is used for producing castings of an engine cylinder body. The present invention has the advantages of advanced technology, high yield and low production cost, and the mould manufacture is simplified. The method can be used for manufacturing other castings with complicated mold cavities.
Description
Technical field
The present invention relates to a kind of casting method, particularly a kind of lost-foam casting method of engine cylinder-body.
Background technology
Engine cylinder-body is a kind of foundry goods of complexity, adopts the manufacturing of ordinary sand casting method, because core part back-up sand and to vacuumize solid type difficulty very big, so do not obtain extensively weary the application at present always.The manufacturing of general employing lost-foam casting method.
Common lost-foam casting method is 1. to utilize polystyrene (EPS) or EPS to make the model consistent with foundry goods with the expanded material that EPMMA mixes at present, 2. model is placed sandbox, 3. insert dry sand, model exocoel and core part are carried out the three-dimensional vibrating consolidation simultaneously, 4. vacuumize at sandbox top plastic covering film and in sandbox, 5. molten metal is cast to the model area that expanded material is made, the model gasification disappears, the metal replacement model, copy the foundry goods the same with steeping moulding model, after the condensation, take out foundry goods.Using this casting method to be easy to generate two problems when producing cylinder block casting, at first is that core partly disappears model because the double envelopment of sand makes the gas of gasification be difficult for discharging, and has caused producing on the foundry goods defectives such as elephant skin, bright carbon.Just require strict control bubble moulding material density for addressing this problem, and even use more expensive EPMMA bead.Simultaneously because core partly is the dual jacket structure for water of cylinder body, sand inlet in its cavity is at downside, make three-dimensional vibrating be difficult to sand is filled full and consolidation, the very easy generation of type wall is moved when cast, when producing cylinder body spare, just easily produce casting flaws such as shrinkage porosite, the sand that collapses, so require to use good remedial measure, thereby increased the cost operation, manufacture difficulty also strengthens.
Summary of the invention
Purpose of the present invention just provides a kind of lost-foam casting method of engine cylinder-body, partly disappear model because the double envelopment of sand makes the gas of gasification be difficult for discharging to solve the core that existing lost-foam casting method exists, caused producing on the foundry goods defectives such as elephant skin, bright carbon, and when cast the type wall easily produce and move and cause that cylinder body spare easily produces shrinkage porosite, the problem of the casting flaws such as sand of collapsing.
Technical scheme of the present invention is: its processing step comprises: place the disappearance mould model made from expanded material the same with foundry goods in sandbox, in sandbox, insert dry sand and vibration ramming, at sandbox top plastic covering film, to vacuumizing in the sandbox, molten metal is cast to described disappearance mould model area, solidify fully until foundry goods, it is characterized in that: before described disappearance mould model places sandbox, at first pre-back-up sand in the cavity of this model mid portion, pre-then vibration ramming, last forvacuum.
The mid portion of described disappearance mould model constitutes by manufacturing formwork shell separately, it is combined in the block mold again.
The preparation method of described formwork shell is: at first make the disappearance mould, be coated with shell on its surface and solidify, and then the disappearance mould that will be coated with in the shell is removed.
The core shell that described formwork shell adopts the method for sand casting to form.
The degree of packing of described dry sand behind vibration ramming is at 1.65g/cm
3More than, the sand mold internal negative pressure is in 0.060-0.040Mpa.
The present invention is the core part with cylinder block casting, adopts pre-back-up sand, pre-jolt ramming, forevacuum, strengthens body thereby formed one, well solve the core orientation problem in casting process, thereby it is moving to have reduced the type wall shift, and the yield rate of cylinder block casting improves greatly.Because removed the gasified pattern of core part in advance, the gasifying gas when having significantly reduced casting has been eliminated defectives such as producing elephant skin, bright carbon on the foundry goods, has improved castability, has saved the follow-up operation of remedying, and has reduced cost.
Below in conjunction with accompanying drawing the present invention is done progressive explanation.
Description of drawings
Fig. 1 is the disappearance mould model structure schematic diagram of single cylinder engine body;
Fig. 2 is the structural representation of disappearance mould model after pre-back-up sand, pre-vibration ramming and forvacuum of Fig. 1;
Fig. 3 is that disappearance mould model places the structural representation when casting in the sandbox.
The specific embodiment
Referring to Fig. 1～Fig. 3, processing step of the present invention is as follows:
1, at first adopt polystyrene (EPS) to make disappearance mould block mold 1 (see figure 1) identical with the cylinder block casting shape by common disappearance mold technique, core mid portion 2 (cylinder body water jacket midfeather, referring to Fig. 2) manufacture formwork shell separately, again it is combined in the block mold 1.The preparation method of formwork shell can be: make the disappearance mould earlier, be coated with shell on its surface and solidify, and then the disappearance mould that will be coated with in the shell is removed.The resulting shell that is coated with is formwork shell.Formwork shell is the core shell of the method formation of shell employing sand casting also.
2, the preformed hole 3 core parts 2 from cylinder body block mold 1 add sand in advance.3, the core part 2 that adds sand is in advance vibrated and forvacuum in advance.
4, with preformed hole 3 sealings of resin sand, core part 2 is formed strengthen piece (referring to Fig. 2) the pre-part of core.
5, the block mold of forming 1 is put into sandbox 4 and cast, promptly carry out according to adding sand, vibration ramming, plastic covering film, the operation that vacuumizes, casts by existing common disappearance mold technique.The degree of packing of dry sand 5 behind vibration ramming that adds in sandbox 4 is at 1.65g/cm
3More than, the vacuum of sand mold inside is in 0.060-0.040Mpa.The raising of the degree of packing has guaranteed can not collapse sand, and gas clean-up helps the gas diffusion, guarantees Forming Quality.
Adopt this method to produce the engine cylinder-body foundry goods, technology advanced person, the mould manufacturing is simplified, and yield rate height, production cost are low.The method also can be used for making the foundry goods of other die cavity complexity.
Claims (5)
1, a kind of lost-foam casting method of engine cylinder-body, its processing step comprises: place the disappearance mould model made from expanded material the same with foundry goods in sandbox, in sandbox, insert dry sand and vibration ramming, at sandbox top plastic covering film, to vacuumizing in the sandbox, molten metal is cast to described disappearance mould model area, solidify fully until foundry goods, it is characterized in that: before described disappearance mould model places sandbox, at first pre-back-up sand in the cavity of this model mid portion, pre-then vibration ramming, last forvacuum.
2, according to the lost-foam casting method of claims 1 described engine cylinder-body, it is characterized in that: the mid portion of described disappearance mould model constitutes by manufacturing formwork shell separately, it is combined in the block mold again.
3, according to the lost-foam casting method of claims 2 described engine cylinder-bodies, it is characterized in that: the preparation method of described formwork shell is: at first make the disappearance mould, be coated with shell on its surface and solidify, and then the disappearance mould that will be coated with in the shell is removed.
4, according to the lost-foam casting method of claims 2 described engine cylinder-bodies, it is characterized in that: the core shell that described formwork shell adopts the method for sand casting to form.
5, according to the lost-foam casting method of claims 1,2,3 or 4 described engine cylinder-bodies, it is characterized in that: the degree of packing of described dry sand behind vibration ramming is at 1.65g/cm
3More than, the sand mold internal negative pressure is in 0.060-0.040Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101211162A CN100446893C (en) | 2003-12-15 | 2003-12-15 | Lost foam foundry method for engine cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101211162A CN100446893C (en) | 2003-12-15 | 2003-12-15 | Lost foam foundry method for engine cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1628923A CN1628923A (en) | 2005-06-22 |
| CN100446893C true CN100446893C (en) | 2008-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101211162A Expired - Fee Related CN100446893C (en) | 2003-12-15 | 2003-12-15 | Lost foam foundry method for engine cylinder |
Country Status (1)
| Country | Link |
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| CN (1) | CN100446893C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103212668A (en) * | 2012-01-18 | 2013-07-24 | 浙江派尼尔机电有限公司 | Method for manufacturing outboard engine cylinder |
| CN107486544A (en) * | 2017-08-22 | 2017-12-19 | 安徽大卫模具有限公司 | A kind of lost foam casting process |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101590513B (en) * | 2009-07-03 | 2011-04-27 | 郑州神牛铸造有限公司 | Method for precise composite casting evaporative pattern |
| CN101972844A (en) * | 2010-10-28 | 2011-02-16 | 黄元吉 | Production process for applying expendable pattern casting technology to vermicular-iron diesel engine |
| CN102228954B (en) * | 2011-06-14 | 2013-02-13 | 安徽全柴天和机械有限公司 | Lost foam casting technique capable of reducing deformation of mould piece joining seam |
| CN102310163A (en) * | 2011-09-19 | 2012-01-11 | 滁州金诺实业有限公司 | Lost foam casting method of engine gear chamber |
| CN103212669A (en) * | 2012-01-20 | 2013-07-24 | 天津市瑞普天晟汽车零部件制造有限公司 | Lost-foam casting model of engine cylinder body and casting method |
| CN103372630B (en) * | 2012-04-25 | 2017-07-04 | 河北瑞丰动力缸体有限公司 | A kind of evaporative pattern production technology of engine cylinder-body |
| CN102744367A (en) * | 2012-07-17 | 2012-10-24 | 武汉工程大学 | Lost foam-shell mold casting vibration and solidification method based on foam mold |
| CN103056338B (en) * | 2012-12-14 | 2015-06-17 | 江苏时代华宜电子科技有限公司 | Method for forming aluminum silicon carbide substrate for high-power module |
| CN103273007A (en) * | 2013-05-16 | 2013-09-04 | 重庆汉华汽车零部件制造有限公司 | Casting technique of V12-type engine cylinder block |
| CN104475684A (en) * | 2015-01-08 | 2015-04-01 | 广西玉柴机器股份有限公司 | Casting technology of complex shell part |
| 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 |
| CN109420738A (en) * | 2018-12-26 | 2019-03-05 | 黄石新兴管业有限公司 | A kind of casting technique of larger ratio of height to diameter bottom filling gray cast iron electrode mould |
| 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 |
| CN114260423A (en) * | 2020-12-01 | 2022-04-01 | 安阳市凯创科技有限公司 | Casting heat section treatment method for medium and large precision castings |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1333104A (en) * | 2000-07-12 | 2002-01-30 | 山东科技大学机械厂 | Method for producing cast iron cylinder jacket of diesel engine |
| CN1446648A (en) * | 2003-01-10 | 2003-10-08 | 刘立中 | Casting box reversal type technique in vanish mould casting |
-
2003
- 2003-12-15 CN CNB2003101211162A patent/CN100446893C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1333104A (en) * | 2000-07-12 | 2002-01-30 | 山东科技大学机械厂 | Method for producing cast iron cylinder jacket of diesel engine |
| CN1446648A (en) * | 2003-01-10 | 2003-10-08 | 刘立中 | Casting box reversal type technique in vanish mould casting |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103212668A (en) * | 2012-01-18 | 2013-07-24 | 浙江派尼尔机电有限公司 | Method for manufacturing outboard engine cylinder |
| CN107486544A (en) * | 2017-08-22 | 2017-12-19 | 安徽大卫模具有限公司 | A kind of lost foam casting process |
| CN107486544B (en) * | 2017-08-22 | 2019-10-22 | 安徽大卫模具有限公司 | A kind of lost foam casting process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1628923A (en) | 2005-06-22 |
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Owner name: SHANXI HUAER POWER MACHINERY CO., LTD. Free format text: FORMER OWNER: LI ZIMING Effective date: 20100916 Free format text: FORMER OWNER: YIN SHIHE |
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Free format text: CORRECT: ADDRESS; FROM: 043500 FANDIAN VILLAGE, NANTANG TOWNSHIP, YICHENG COUNTRY, SHANXI PROVINCE TO: 043500 FANDIAN VILLAGE, NANTANG TOWN, YICHENG COUNTY, SHANXI PROVINCE, CHINA |
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Effective date of registration: 20100916 Address after: Where the 043500 Chinese village in Shanxi province Yicheng county Southern Tang Xiang Patentee after: Shanxi Huaer Power Machinery Co., Ltd. Address before: Where the village 043500 Shanxi County of Yicheng Province Tang Xiang Co-patentee before: Yin Shihe Patentee before: Li Ziming |
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