CN104148589A - Method for reducing blow holes in sand casting part - Google Patents
Method for reducing blow holes in sand casting part Download PDFInfo
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- CN104148589A CN104148589A CN201410337459.0A CN201410337459A CN104148589A CN 104148589 A CN104148589 A CN 104148589A CN 201410337459 A CN201410337459 A CN 201410337459A CN 104148589 A CN104148589 A CN 104148589A
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- nylon plastic
- sand
- sand casting
- pipe
- core
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Abstract
The invention discloses a method for reducing blow holes in a sand casting part. A hollow nylon plastic tube is arranged on the core bar of a mold core along the core bar; two ends of the nylon plastic tube are positioned outside a molding core; through holes which are distributed in a net manner are formed in the outer surface of the nylon plastic tube; the diameter of each through hole in the outer surface of the nylon plastic tube is smaller than that of sand. The method disclosed by the invention is simple and feasible, low in cost and wide in application range, discharge of invasive gases is effectively promoted, and the blow holes in the sand casting part are remarkably reduced.
Description
Technical field
The invention belongs to sand casting field, particularly a kind of method that reduces sand casting bleb.
Background technology
Casting refers to poured with molten metal, injection or sucks in casting mold die cavity, obtains the method for definite shape and performance foundry goods after it solidifies.Casting method is a lot, and by production method difference, casting can be divided into sand casting and the large class of Special Processes of Metal Castings two.Sand casting is the casting method being shaped with molding sand consolidation.Sand casting process process is mainly made up of following components: oven dry, mould assembling, smelting metal, cast, knockout and the cleaning etc. of making sand mold, moulding core, sand mold and core.
Foundry goods, in castable process, has a large amount of gas to exist in die cavity, these gas sources are in the air being detained in casting mold die cavity; The gas that when cast, sand mold, core material produce under molten steel heat effect; The gas that stud, chill produce in the time of cast; The gas that in molten steel itself or molten steel, field trash and the effect of molten steel generation physical-chemical produce; Running gate system arranges improper or pouring operation is lack of standardization and gas of being involved in molten steel etc.Gas major part in casting process in die cavity can the rising in die cavity be passed through the discharges such as rising head, venthole, airway with molten steel, if be trapped in foundry goods or the interface of foundry goods and casting mold on, will in foundry goods, produce the defect such as pore or misrun, even scrap.
In Modeling Material, contain the multiple organic or inorganic things such as waterglass, sawdust, clay, bentonite and water, they are subject to thermal evaporation or burning can produce a large amount of gas.Especially water, its vapourizing temperature is lower, volume drastic change after being heated.According to surveying and determination, 1 drips when running into high-temperature liquid metal to become temperature being the steam of 1300 DEG C, and its volume will expand 7000 times.After these air accumulations, pressure increases, and freely will not invade in molten steel if discharged, and that before casting solidification, does not overflow can form foundry goods blowhole defect.Invade in molten steel in order to prevent these gases, after general sand foundry goods moulding, can dry sand mold die cavity and core with all kinds of drying plants, allow the certain thickness sand of die cavity inside dry out and to keep dry as far as possible, while cast like this, molten steel contact sand surface can not produce gas, and bleb is just less.Although drying plant has been dried the certain thickness sand in the inside of die cavity, but due to the molten steel of more than 1600 degree, to pour heat after die cavity into huge, make the darker local moist sand in sand mold inside still produce a lot of aqueous vapors, these gas are all-pervasive, can produce invasive gas to cast(ing) surface.In order to stop these gases to enter molten steel surface as far as possible, best mode is to allow these gases can discharge sandbox.
Summary of the invention
The object of the present invention is to provide a kind of method that reduces sand casting bleb.
The technical solution that realizes the object of the invention is: a kind of method that reduces sand casting bleb, the nylon plastic(s) pipe of hollow is set along arbor on the arbor of core, and the outer surface of described nylon plastic(s) pipe has the through hole that is net distribution.
The through hole of described nylon plastic(s) tube outer surface is less than sand diameter.
Described nylon plastic(s) pipe is circular.
Described nylon plastic(s) pipe two ends are positioned at outside core.
Described nylon plastic(s) pipe is fixed on arbor by binding mode.
Principle of the present invention is: for increasing core strength and rigidity, conventionally in core, settle by iron wire or castiron skeleton, claim " arbor ", be commonly called as " core iron " or " core iron ".There is space on nylon tube surface, and nylon tube bundlees along arbor, imbeds together in sand, and now, the gas producing in sand after cast just can see through nylon tube surface through hole and enter nylon tube hollow position, discharges outside sandbox along the path of arbor.The through hole of nylon tube is less than the diameter of sand, and sand can not enter nylon tube hollow position when moulding like this, thereby and can only see through gas gas is discharged to sandbox.
The present invention compared with prior art, its remarkable advantage: method of the present invention is simple, cost is little, purposes scope is wide, has effectively promoted the discharge of invasive gas, has significantly reduced sand casting bleb.
Detailed description of the invention
In this enforcement, the nylon plastic(s) pipe of hollow is adopted the iron wire of diameter 1mm be fixed on arbor along arbor (castiron skeleton) binding, the outer surface of nylon plastic(s) pipe has the through hole that is net distribution, this through hole need be less than the diameter of sand, and sand can not enter the hollow position of nylon plastic(s) pipe inside when moulding like this.Nylon plastic(s) pipe two ends are positioned at outside core, and the gas producing in sand after cast just can enter through the through hole on nylon tube surface the hollow position of nylon tube inside, discharges outside sandbox along the path of arbor.The present invention adopts nylon plastic(s) pipe, even if be that nylon plastic(s) pipe has melted during due to high temperature, also can not stop up original exhaust pathway.
Facts have proved, through such scheme, effectively promoted the discharge of invasive gas, sand casting bleb rate has reduced by 50% left and right, has significantly reduced sand casting bleb.
Claims (6)
1. a method that reduces sand casting bleb, is characterized in that, the nylon plastic(s) pipe of hollow is set along arbor on the arbor of core, and the outer surface of described nylon plastic(s) pipe has the through hole that is net distribution.
2. the method for minimizing sand casting bleb according to claim 1, is characterized in that, the through hole of described nylon plastic(s) tube outer surface is less than sand diameter.
3. the method for minimizing sand casting bleb according to claim 1, is characterized in that, described nylon plastic(s) pipe is circular.
4. the method for minimizing sand casting bleb according to claim 1, is characterized in that, described nylon plastic(s) pipe two ends are positioned at outside core.
5. the method for minimizing sand casting bleb according to claim 1, is characterized in that, described nylon plastic(s) pipe is fixed on arbor by binding mode.
6. the method for minimizing sand casting bleb according to claim 5, is characterized in that, described nylon plastic(s) pipe is bundled and is fixed on arbor by iron wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410337459.0A CN104148589A (en) | 2014-07-16 | 2014-07-16 | Method for reducing blow holes in sand casting part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410337459.0A CN104148589A (en) | 2014-07-16 | 2014-07-16 | Method for reducing blow holes in sand casting part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104148589A true CN104148589A (en) | 2014-11-19 |
Family
ID=51874320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410337459.0A Pending CN104148589A (en) | 2014-07-16 | 2014-07-16 | Method for reducing blow holes in sand casting part |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104148589A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105834369A (en) * | 2016-04-28 | 2016-08-10 | 安徽霍山县象山机械制造有限公司 | Sand core with exhaust device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6076249A (en) * | 1983-09-30 | 1985-04-30 | Toyota Motor Corp | Sand core |
| JPS63215337A (en) * | 1987-03-02 | 1988-09-07 | Kobe Steel Ltd | Production of core |
| JP3619200B2 (en) * | 2002-02-20 | 2005-02-09 | アツタ起業株式会社 | Die casting method and die casting apparatus |
| CN101342578A (en) * | 2008-08-18 | 2009-01-14 | 沪东重机有限公司 | Mud core through long screw hole and manufacture thereof |
| CN102259165A (en) * | 2011-07-11 | 2011-11-30 | 潍坊凯力石油化工机械有限公司 | Vacuum sealing core making method |
| CN103624218A (en) * | 2013-10-25 | 2014-03-12 | 宝鸡石油机械有限责任公司 | Casting method of hollow crankshaft of slurry pump |
-
2014
- 2014-07-16 CN CN201410337459.0A patent/CN104148589A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6076249A (en) * | 1983-09-30 | 1985-04-30 | Toyota Motor Corp | Sand core |
| JPS63215337A (en) * | 1987-03-02 | 1988-09-07 | Kobe Steel Ltd | Production of core |
| JP3619200B2 (en) * | 2002-02-20 | 2005-02-09 | アツタ起業株式会社 | Die casting method and die casting apparatus |
| CN101342578A (en) * | 2008-08-18 | 2009-01-14 | 沪东重机有限公司 | Mud core through long screw hole and manufacture thereof |
| CN102259165A (en) * | 2011-07-11 | 2011-11-30 | 潍坊凯力石油化工机械有限公司 | Vacuum sealing core making method |
| CN103624218A (en) * | 2013-10-25 | 2014-03-12 | 宝鸡石油机械有限责任公司 | Casting method of hollow crankshaft of slurry pump |
Non-Patent Citations (3)
| Title |
|---|
| P.R.比利: "《铸造工艺学》", 30 September 1986, 北京：机械工业出版社 * |
| 潘宜祥等: "双抽12万千瓦汽轮机喷嘴室试铸", 《上海汽轮机》 * |
| 舒金波等: "《铸造工、锻造工快速入门》", 30 September 2011, 中南大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105834369A (en) * | 2016-04-28 | 2016-08-10 | 安徽霍山县象山机械制造有限公司 | Sand core with exhaust device |
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Application publication date: 20141119 |