CN102909313B - Copper-alloy casting core sand and fabrication method thereof - Google Patents
Copper-alloy casting core sand and fabrication method thereof Download PDFInfo
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Abstract
The invention relates to copper-alloy casting core sand and a fabrication method of the copper-alloy casting core sand. The core sand comprises quartz sand, flake graphite with the weight accounting for 2-5% of the weight of the quartz sand, amorphous graphite with the weight accounting for 2-5% of the weight of the quartz sand, white mud with the weight accounting for 2-4% of the weight of the quartz sand and water glass with the weight accounting for 9-11% of the weight of the quartz sand. The fabrication method comprises the steps of mixing the quartz sand, the flake graphite, the amorphous graphite and the white mud that are in appropriate particle sizes with a sand mixer for 5-10 s, and then adding the water glass for wet mixing for 15-20 s to obtain the copper-alloy casting core sand. According to the characteristics of high strength and higher fire resistance requirements of a casting middle sand core, the quartz sand is selected as a main molding material; the amorphous graphite is added to increase the high temperature resistance; the flake graphite is added to increase the flowability, fineness and collapsibility and to improve the filling capacity; the white mud is added to increase the wet strength after core sand filling; and the water glass is used as a binding agent for simple and convenient fabrication, and convenient operation, casting forming and drawing. The fabricated copper-alloy casting sand is high in strength, good in collapsibility, good in filling property, high in fire resistance and good in high-temperature cracking resistance, and the quality of a copper-alloy casting product can be improved.
Description
Technical field
The present invention relates to loam core sand and compound method thereof in the middle of a kind of casting industry, particularly to copper-alloy casting core sand forming large-scale copper alloy foundry goods axis hole quality and preparation method thereof.
Background technology
Due to the particularity in loam core in the middle of copper-alloy casting, traditional handicraft many employings light water glass sand makes casting mold sand, although light water glass sand has easy, with low cost, easy to operate, the shaping easy advantage of preparation, but also have weak point: first, intensity is not enough to make ultra-large type copper-alloy casting with holes; Secondly, of focusing on the most in middle the loam core for copper-alloy casting---deformability, can not meet the requirement of its contraction.And the foundry goods utilizing this molding sand to make, need a large amount of later stage cleaning works, this greatly reduces the operating efficiency making large-scale copper alloy band hole casting parts, extends the production cycle to a great extent simultaneously, wastes a large amount of human and material resources.This molding sand is mainly used in the core sand of gravitational casting.
The patent of invention that the applicant has " molding sand and preparation method thereof " (patent No. ZL200610019128.8), molding sand is made up of the zirconium English powder of zircon sand, zircon sand weight 0.3 ~ 0.8%, the graphite powder of 0.6 ~ 1.2%, the waterglass of 7 ~ 9%.Preparation method is, takes zircon sand, zirconium English powder, graphite powder puddle mixer mixing 5 ~ 10s, then add waterglass wet mixing 15 ~ 20s, obtain copper-alloy casting core sand by percent by weight proportioning.This molding sand is mainly used in the facing sand of Art Casting.
Summary of the invention
The object of the invention is for above-mentioned present situation, aim to provide a kind of formula, preparation method is reasonable, sand bond is high, collapsibility good, Packing character is good, refractoriness is high, high temperature resistance cracking behavior is good, copper-alloy casting core sand that can improve copper-alloy casting product quality and preparation method thereof.
The implementation of the object of the invention is, copper-alloy casting core sand, is made up of the flake graphite of quartz sand and quartz sand weight 2 ~ 5%, the amorphous graphite of 2 ~ 5%, white clay, 9 ~ 11% waterglass of 2 ~ 4%,
The granularity of quartz sand is 40 ~ 70 orders, granularity >=50 order of flake graphite, granularity >=200 order of amorphous graphite, granularity >=200 order of white clay, and modulus of water glass is 2.2 ~ 2.6, and Baume degrees is 46 ~ 50.
The preparation method of copper-alloy casting core sand, get quartz sand and quartz sand weight, 2 ~ 5% flake graphites, 2 ~ 5% amorphous graphites, 2 ~ 4% white clay puddle mixer mixing 5 ~ 10s, then add the waterglass wet mixing 15 ~ 20s of 9 ~ 11%, obtain copper-alloy casting core sand.
Requirement of strength high, the fire-resistant degree in loam core in the middle of foundry goods that the present invention is directed to requires higher feature, selects quartz sand to do main Modeling Material; For the high temperature resistant property increasing core sand adds amorphous graphite; For increase core sand mobility, improve mold-filling capacity, strengthen molding sand exquisiteness and add flake graphite as auxiliary material; Core sand can be made to possess good collapsibility adding of amorphous graphite simultaneously; White clay is added for increase core sand fills the wet strength after type; Easy for preparing, binding agent made by easy to operate waterglass; Shaping and the molding for convenience of foundry goods, adopts and blows CO
2harden.
Formula of the present invention, preparation method are reasonable, and sand bond is high, collapsibility good, Packing character is good, refractoriness is high, high temperature resistance cracking behavior is good, can improve copper-alloy casting product quality.
Detailed description of the invention
Copper-alloy casting core sand of the present invention, is made up of the flake graphite of quartz sand and quartz sand weight 2 ~ 5%, the amorphous graphite of 2 ~ 5%, white clay, 9 ~ 11% waterglass of 2 ~ 4%,
Preparation method is, takes quartz sand, flake graphite, amorphous graphite, white clay puddle mixer mixed sand machine mixing 5 ~ 10s, then add waterglass wet mixing 15 ~ 20s, obtain copper-alloy casting core sand by percent by weight proportioning.
Require that higher spy asks for requirement of strength high, fire-resistant degree in loam core in the middle of foundry goods, select suitable granularity requirements, wherein, the granularity of quartz sand is 40 ~ 70 orders, granularity >=50 order of flake graphite, granularity >=200 order of amorphous graphite, granularity >=200 order of white clay, modulus of water glass is 2.2 ~ 2.6, and Baume degrees is 46 ~ 50.
In the present invention's preparation, employing is two stirs batch (-type) puddle mixer, and two groups of three layers of blade agitators rotating speeds of machine are 280r/min, stir scope wide, fully meets quick, the uniform requirement of mulling.
Enumerate formulation Example of the present invention below:
Example 1, get that granularity is 40 object quartz sands and quartz sand weight 2%, granularity is 50 object flake graphites, 2%, granularity is 200 object amorphous graphites, 2%, granularity is 200 object white clay puddle mixer mixing 5s, then add 9%, modulus is 2.2, Baume degrees is the waterglass wet mixing 15s of 46, obtains copper-alloy casting core sand.
Example 2, get that granularity is 45 object quartz sands and quartz sand weight 3%, granularity is 50 object flake graphites, 3%, granularity is 200 object amorphous graphites, 3%, granularity is 200 object white clay puddle mixer mixing 6s, then add 9%, modulus is 2.2, Baume degrees is the waterglass wet mixing 16s of 47, obtains copper-alloy casting core sand.
Example 3, get that granularity is 42 object quartz sands and quartz sand weight 4%, granularity is 52 object flake graphites, 4%, granularity is 210 object amorphous graphites, 3.5%, granularity is 205 object white clay puddle mixer mixing 8s, then add 9%, modulus is 2.3, Baume degrees is the waterglass wet mixing 18s of 46, obtains copper-alloy casting core sand.
Example 4, get that granularity is 45 object quartz sands and quartz sand weight 5%, granularity is 55 object flake graphites, 5%, granularity is 210 object amorphous graphites, 4%, granularity is 210 object white clay puddle mixer mixing 10s, then add 9%, modulus is 2.2, Baume degrees is the waterglass wet mixing 20s of 46, obtains copper-alloy casting core sand.
Example 5, get that granularity is 54 object quartz sands and quartz sand weight 2%, granularity is 56 object flake graphites, 2%, granularity is 200 object amorphous graphites, 2%, granularity is 210 object white clay puddle mixer mixing 5s, then add 9%, modulus is 2.4, Baume degrees is the waterglass wet mixing 15s of 46, obtains copper-alloy casting core sand.
Example 6, get that granularity is 58 object quartz sands and quartz sand weight 3%, granularity is 51 object flake graphites, 3%, granularity is 225 object amorphous graphites, 3%, granularity is 210 object white clay puddle mixer mixing 5s, then add 10%, modulus is 2.6, Baume degrees is the waterglass wet mixing 16s of 50, obtains copper-alloy casting core sand.
Example 7, to get quartz sand size be 60 orders and quartz sand weight 4%, granularity 50 object flake graphite, 4%, granularity is 200 object amorphous graphites, 3.5%, granularity is 200 object white clay puddle mixer mixing 8s, then add 10%, modulus is 2.5, Baume degrees is the waterglass wet mixing 18s of 48, obtains copper-alloy casting core sand.
Example 8, get that granularity is 62 object quartz sands and quartz sand weight 5%, granularity is 55 object flake graphites, 4%, granularity is 210 object amorphous graphites, 4%, granularity is 200 object white clay puddle mixer mixing 10s, then add 9%, modulus is 2.2, Baume degrees is the waterglass wet mixing 20s of 49, obtains copper-alloy casting core sand.
Example 9, get that quartz sand size is 70 orders and quartz sand weight 2%, granularity is 50 object flake graphites, 2%, granularity is 200 object amorphous graphites, 2%, granularity is 200 object white clay puddle mixer mixing 5s, then add 11%, modulus is 2.6, Baume degrees is the waterglass wet mixing 15s of 50, obtains copper-alloy casting core sand.
Example 10, get that quartz sand size is 55 orders and quartz sand weight 3%, granularity is 50 object flake graphites, 3%, granularity >=200 object amorphous graphite, 3%, granularity is 200 object white clay puddle mixer mixing 6s, then to add 11%, modulus is 2.2, Baume degrees is 46 waterglass wet mixing 16s, obtains copper-alloy casting core sand.
Example 11, get that quartz sand size is 67 orders and quartz sand weight 4%, granularity is 50 object flake graphites, 4%, granularity is 200 object amorphous graphites, 3.5%, granularity is 200 object white clay puddle mixer mixing 8s, then add 11%, modulus is 2.3, Baume degrees is the waterglass wet mixing 18s of 47, obtains copper-alloy casting core sand.
Example 12, get that quartz sand size is 48 orders and quartz sand weight 5%, granularity is 50 object flake graphites, 5%, granularity is 200 object amorphous graphites, 4%, granularity is 200 object white clay puddle mixer mixing 10s, then add 11%, modulus is 2.6, Baume degrees is the waterglass wet mixing 20s of 49, obtains copper-alloy casting core sand.
Claims (2)
1. copper-alloy casting core sand, is characterized in that being made up of the flake graphite of quartz sand and quartz sand weight 2 ~ 5%, the amorphous graphite of 2 ~ 5%, white clay, 9 ~ 11% waterglass of 2 ~ 4%,
The granularity of quartz sand is 40 ~ 70 orders, granularity >=50 order of flake graphite, granularity >=200 order of amorphous graphite, granularity >=200 order of white clay, and modulus of water glass is 2.2 ~ 2.6, and Baume degrees is 46 ~ 50.
2. prepare the method for copper-alloy casting core sand according to claim 1, it is characterized in that the flake graphite, the amorphous graphite of 2 ~ 5%, the white clay puddle mixer mixing 5 ~ 10s of 2 ~ 4% that get quartz sand and quartz sand weight 2 ~ 5%, then add the waterglass wet mixing 15 ~ 20s of 9 ~ 11%, obtain copper-alloy casting core sand.
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| CN201210392698.7A CN102909313B (en) | 2012-10-16 | 2012-10-16 | Copper-alloy casting core sand and fabrication method thereof |
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| CN104439040A (en) * | 2014-12-01 | 2015-03-25 | 昌利锻造有限公司 | Molding sand applied to copper alloy castings and preparation method of molding sand |
| CN105665615B (en) | 2016-02-05 | 2018-10-02 | 济南圣泉集团股份有限公司 | A kind of casting waterglass curing agent and its preparation method and application |
| CN114535512A (en) * | 2022-03-21 | 2022-05-27 | 勤威(天津)工业有限公司 | Cold core manufacturing production process |
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| US4162238A (en) * | 1973-07-17 | 1979-07-24 | E. I. Du Pont De Nemours And Company | Foundry mold or core compositions and method |
| US4583581A (en) * | 1984-05-17 | 1986-04-22 | Trw Inc. | Core material and method of forming cores |
| CN1872450A (en) * | 2006-05-23 | 2006-12-06 | 武汉重工铸锻有限责任公司 | Molding sand and preparation method |
| CN101347829A (en) * | 2007-07-16 | 2009-01-21 | 黄石铜兴机械有限公司 | Sand casting copper anode mold technique |
| WO2011032668A2 (en) * | 2009-09-16 | 2011-03-24 | Süd-Chemie AG | Foundry additive based on graphite |
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2012
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4162238A (en) * | 1973-07-17 | 1979-07-24 | E. I. Du Pont De Nemours And Company | Foundry mold or core compositions and method |
| US4583581A (en) * | 1984-05-17 | 1986-04-22 | Trw Inc. | Core material and method of forming cores |
| CN1872450A (en) * | 2006-05-23 | 2006-12-06 | 武汉重工铸锻有限责任公司 | Molding sand and preparation method |
| CN101347829A (en) * | 2007-07-16 | 2009-01-21 | 黄石铜兴机械有限公司 | Sand casting copper anode mold technique |
| WO2011032668A2 (en) * | 2009-09-16 | 2011-03-24 | Süd-Chemie AG | Foundry additive based on graphite |
Non-Patent Citations (1)
| Title |
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| 中国机械工程学会铸造分会.铸造手册.第4卷,造型材料.《铸造手册.第4卷,造型材料》.2002,79. * |
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