CN102266903A - Moulding sand capable of remarkably improving quality of brake hub casting - Google Patents
Moulding sand capable of remarkably improving quality of brake hub casting Download PDFInfo
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- CN102266903A CN102266903A CN2011102215682A CN201110221568A CN102266903A CN 102266903 A CN102266903 A CN 102266903A CN 2011102215682 A CN2011102215682 A CN 2011102215682A CN 201110221568 A CN201110221568 A CN 201110221568A CN 102266903 A CN102266903 A CN 102266903A
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Abstract
The invention relates to moulding sand capable of remarkably improving the quality of a brake hub casting. The moulding sand consists of the following raw materials in percentage by weight: 93.3 to 93.9 percent of used sand, 1.2 percent of new original sand, 0.6 to 1.0 percent of bentonite, 0.3 to 0.5 percent of coal dust and about 4.0 percent of water. The porosity of subcutaneous slag of the brake hub casting produced by a sand mould prepared by the moulding sand is controlled to be below 1 percent; the shrinkage porosity inside the casting is eliminated radically; and the product yield is increased and the production cost is reduced.
Description
The ㈠ technical field: the invention belongs to the preparation raw material of the process product-casting mold of automotive brake hub, specifically is a kind of molding sand that significantly improves braking hub casts quality.
The ㈡ background technology: the braking hub belongs to gray iron casting, at present domestic such foundry goods how is produced with the molding sand of common bentonite and common coal dust, mainly is to clear up and reduce the foundry goods subcutaneous blowhole that high volatile volatile material that the effective coal dust of height brings causes well for cast(ing) surface.But low effective coal dust often can not suppress molten iron and enters the secondary oxidation slag that produces behind the die cavity in the molding sand, causes cast(ing) surface and subcutaneous slag gas hole defect to increase; It is on the low side that common bentonite tends to cause sand bond in the molding sand, can't reduce the shrinkage defect that foundry goods produces in process of setting, and some unmeasured moulding-sand properties can influence the quality of final casting simultaneously.
The ㈢ summary of the invention: purpose of the present invention just provides a kind of molding sand that significantly improves braking hub casts quality; The braking hub casts that the sand mold of being made by this molding sand is produced, its subcutaneous slag pore has obtained effective control, and the inner shrinkage porosite problem of foundry goods is eliminated substantially.
A kind of molding sand that significantly improves braking hub casts quality of the present invention is characterized in that being made up of following raw materials in percentage by weight:
Old sand 93.3-93.9%
New roughing sand 1.2%
Bentonite 0.6-1.0%
Coal dust 0.3-0.5%
Water adds to 100%,
Described old sand means the molding sand of sand mold after fragmentation of casting and using, and has raw material weight percentage in it and is: roughing sand 82-85%, and bentonite 7-8%, coal dust 5-6%, ash content 1-2%, surplus is a water;
The VF-10 bentonite that described bentonite must select for use Jianping, Beijing Dongming mining company of dimension section (being called for short Beijing dimension section) to produce;
The efficient coal dust that described coal dust must select Shandong for use the people live in plenty founding materials company (the people live in plenty to be called for short Shandong) to produce.
The preferred raw material weight percentage composition of the present invention is:
Old sand 93.5%
New roughing sand 1.2%
Bentonite 0.8%
Coal dust 0.38%
Water adds to 100%.
Preparation method of the present invention is same as the prior art, and step is as follows:
By measuring old sand, add into new roughing sand (new roughing sand), add part water wet mixing 30 seconds, add bentonite and coal dust wet mixing 30 seconds again, wet mixing is 60 seconds behind the adding excess water, shakes out, and promptly gets molding sand; Molding sand is injected in the moulding machine; Promptly make sand mold.
Above-mentioned roughing sand is commercially available, and its test stone is as shown in the table:
The roughing sand test stone
Main improvement among the present invention is bentonite and a coal dust of selecting for use particular vendors to produce, and on consumption, increase than existing molding sand, its main foundation is because braking hub casts weight is bigger, every 10 ㎏, setting time is longer, calcination time to foundry goods is longer, and it is big to wash away energy, the sand mold collapse is rushed in form sand holes in the foundry goods.Increase the bentonite addition, can improve the intensity and the hot high-temperature behavior of molding sand, reduce the sand holes defective; Coal dust forms the reproducibility air film in when cast at metal-casting mold interface, can prevent foundry goods scab, can prevent effectively that also foundry goods from producing subcutaneous blowhole, and the braking hub casting mold that the longer scaling loss amount of setting time is bigger needs to increase the addition of coal dust.
Bentonitic performance rating can only be by measuring data such as green compression strength, colloid index, durability, and the performance rating of coal dust can only be passed through several indexs such as ash content, volatile matter, bright carbon, characteristic of char residue, during the auxiliary material sample presentation of the different places of production and producer, these indexs often can both reach the receiving inspection standard, but after coming into operation in batches, it is far away that actual effect but differs.The moulding-sand property that relates to casting defect is various, wherein elevated temperature strength, thermal runaway, die cavity atmosphere, heat distortion amount etc., because series of physical and chemical reaction can take place in casting solidification process, the actual coagulating environment of reduction can't be fully simulated in the laboratory, this mechanism wherein, wouldn't be grasped with simple data by us, therefore can not judge auxiliary material quality quality with index simply, the auxiliary material that different casting structures is suitable for is difference to some extent also, what must adhere to is long-term chase experiment, fixedly purchase channel.Through test of many times, determined to be fit among the present invention bentonite and the coal dust manufacturer and the optimum quantum of utilization of use, its test data is as shown in the table:
Therefore, we are by long-term chase experiment, fixing purchase channel, the bentonite and the Shandong efficient coal dust that the people live in plenty produces that use Beijing dimension section to produce are when consumption is controlled made in appropriate circumstances molding sand foundry goods slag sand holes and subcutaneous slag pore percent defective all minimum (﹤ 1%).
The ㈣ specific embodiment:
Embodiment 1
Get old sand 93.3%, add new roughing sand 1.2%, to the high speed rotator mixed sand machine, add 2.6% water, wet mixing 30 seconds, add the VF-10 bentonite 0.6% that Beijing dimension section produces again, the Shandong efficient coal dust that the people live in plenty 0.3% wet mixing is after 30 seconds, adds remaining 2.0% water wet mixing again 60 seconds, promptly makes molding sand, again molding sand is injected in the moulding machine, can make sand mold.
Embodiment 2
Get old sand 93.9%, add new roughing sand 1.2%, to the high speed rotator mixed sand machine, add 1.7% water, wet mixing 30 seconds, add the only bentonite 1.0% of section of Beijing again, the coal dust that the people live in plenty 0.5% wet mixing in Shandong is after 30 seconds, adds remaining 1.7% water wet mixing again 60 seconds, promptly makes molding sand, again molding sand is injected in the moulding machine, can make sand mold.
Embodiment 3
Get old sand 93.5%, add new roughing sand 1.2%, to the high speed rotator mixed sand machine, add 2.0% water, wet mixing 30 seconds, add the only bentonite 0.8% of section of Beijing again, the coal dust that the people live in plenty 0.38% wet mixing in Shandong is after 30 seconds, adds remaining 2.12% water wet mixing again 60 seconds, promptly makes molding sand, again molding sand is injected in the moulding machine, can make sand mold.
The foregoing description 1-embodiment 3 prepared molding sand reach the prepared sand mold of molding sand thus
Testing result is as follows:
Compact rate of molding: 35～45 molding sand deflection: 0.4MM～0.7MM
Water content: 3.8～4.2% hardness of sand mould surface: 89～92%
Gas permeability: 100～140 molding sand clay contents: 10～13%
Green compression strength: 170～200KPA molding sand granularity: 70-140 order
Effective bentonite content: 8～11% effective coal dust content: 5.5-6.5%
Green shear strength: 30～50
Foundry goods slag sand holes and the equal ﹤ 1% of subcutaneous slag pore percent defective.
Claims (2)
1. one kind can significantly improve the molding sand of braking the hub casts quality, it is characterized in that being made up of following raw materials in percentage by weight:
Old sand 93.3-93.9%
New roughing sand 1.2%
Bentonite 0.6-1.0%
Coal dust 0.3-0.5%
Water adds to 100%,
Described old sand means the molding sand of sand mold after fragmentation of casting and using, and the raw material weight percentage that it contains is: roughing sand 82-85%, and bentonite 7-8%, coal dust 5-6%, ash content 1-2%, surplus is a water;
The VF-10 bentonite that described bentonite must select for use Jianping, Beijing Dongming mining company of dimension section to produce;
The efficient coal dust that described coal dust must select Shandong for use the people live in plenty founding materials company to produce.
2. a kind of molding sand that significantly improves braking hub casts quality according to claim 1 is characterized in that being made up of following raw materials in percentage by weight:
Old sand 93.5%
New roughing sand 1.2%
Bentonite 0.8%
Coal dust 0.38%
Water adds to 100%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011102215682A CN102266903A (en) | 2011-08-04 | 2011-08-04 | Moulding sand capable of remarkably improving quality of brake hub casting |
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| CN2011102215682A CN102266903A (en) | 2011-08-04 | 2011-08-04 | Moulding sand capable of remarkably improving quality of brake hub casting |
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| CN102266903A true CN102266903A (en) | 2011-12-07 |
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| CN2011102215682A Pending CN102266903A (en) | 2011-08-04 | 2011-08-04 | Moulding sand capable of remarkably improving quality of brake hub casting |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102581215A (en) * | 2012-03-16 | 2012-07-18 | 常熟市建华模具有限责任公司 | Casting method for glass mould blank |
| CN103341589A (en) * | 2013-07-02 | 2013-10-09 | 上海圣德曼铸造有限公司 | Sand mixing process for molding clay green sand |
| CN106077421A (en) * | 2016-06-01 | 2016-11-09 | 苏州东海玻璃模具有限公司 | A kind of gravitational casting molding sand and preparing process thereof |
| CN107008850A (en) * | 2017-04-25 | 2017-08-04 | 黄石东贝铸造有限公司 | It is a kind of to prevent the molding sand of cylinder block casting scab |
| CN107377866A (en) * | 2017-08-02 | 2017-11-24 | 合肥市田源精铸有限公司 | A kind of high-quality molding sand |
| CN108772532A (en) * | 2018-06-19 | 2018-11-09 | 马鞍山市益丰实业集团有限公司 | A kind of box moulding sand formula and preparation process |
| CN112191798A (en) * | 2020-09-24 | 2021-01-08 | 中国第一汽车股份有限公司 | Molding sand formula for thin-wall gray iron engine cylinder body |
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| US20060272820A1 (en) * | 2005-06-03 | 2006-12-07 | Szymanski Michael J | Cement compositions comprising environmentally compatible defoaming agents and methods of use |
| CN101468382A (en) * | 2007-12-24 | 2009-07-01 | 西峡县内燃机进排气管有限责任公司 | Mould sand |
| CN101704069A (en) * | 2009-11-27 | 2010-05-12 | 山东鲁达轿车配件股份有限公司 | One-box four-type casting process of brake disk |
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2011
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Patent Citations (3)
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| US20060272820A1 (en) * | 2005-06-03 | 2006-12-07 | Szymanski Michael J | Cement compositions comprising environmentally compatible defoaming agents and methods of use |
| CN101468382A (en) * | 2007-12-24 | 2009-07-01 | 西峡县内燃机进排气管有限责任公司 | Mould sand |
| CN101704069A (en) * | 2009-11-27 | 2010-05-12 | 山东鲁达轿车配件股份有限公司 | One-box four-type casting process of brake disk |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102581215A (en) * | 2012-03-16 | 2012-07-18 | 常熟市建华模具有限责任公司 | Casting method for glass mould blank |
| CN103341589A (en) * | 2013-07-02 | 2013-10-09 | 上海圣德曼铸造有限公司 | Sand mixing process for molding clay green sand |
| CN103341589B (en) * | 2013-07-02 | 2016-02-03 | 上海圣德曼铸造有限公司 | A kind of molding sand mixing technique for clay green sand molding |
| CN106077421A (en) * | 2016-06-01 | 2016-11-09 | 苏州东海玻璃模具有限公司 | A kind of gravitational casting molding sand and preparing process thereof |
| CN107008850A (en) * | 2017-04-25 | 2017-08-04 | 黄石东贝铸造有限公司 | It is a kind of to prevent the molding sand of cylinder block casting scab |
| CN107377866A (en) * | 2017-08-02 | 2017-11-24 | 合肥市田源精铸有限公司 | A kind of high-quality molding sand |
| CN108772532A (en) * | 2018-06-19 | 2018-11-09 | 马鞍山市益丰实业集团有限公司 | A kind of box moulding sand formula and preparation process |
| CN112191798A (en) * | 2020-09-24 | 2021-01-08 | 中国第一汽车股份有限公司 | Molding sand formula for thin-wall gray iron engine cylinder body |
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Application publication date: 20111207 |