CN101804443A - No-bake resin sand for sand casting of magnesium alloy and preparation method thereof - Google Patents
No-bake resin sand for sand casting of magnesium alloy and preparation method thereof Download PDFInfo
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- CN101804443A CN101804443A CN 201010152282 CN201010152282A CN101804443A CN 101804443 A CN101804443 A CN 101804443A CN 201010152282 CN201010152282 CN 201010152282 CN 201010152282 A CN201010152282 A CN 201010152282A CN 101804443 A CN101804443 A CN 101804443A
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Abstract
The invention discloses no-bake resin sand for sand casting of a magnesium alloy in the technical field of metal processing and a preparation method thereof. The no-bake resin sand comprises the following components in percentage by weight: 51 to 100 percent of fine silica sand and 0 to 50 percent of coarse silica sand; the adding amount of resin is 0.8 to 2 percent of the total weight of the fine silica sand and the coarse silica sand of resin; the adding amount of a curing agent is 20 to 60 percent of the adding amount of the resin; and the adding amount of a fire retardant is 1 to 5 percent of the total weight of the fine silica sand and the coarse silica sand. The no-bake resin sand prepared by the invention has higher intensity, good air permeability and less gas evolution. In the casting process, due to the addition of the fire retardant, the reaction and combustion between magnesium and silica sand and impurities in the silica sand can be prevented, and magnesium alloy castings with excellent surface quality can be obtained.
Description
Technical field
What the present invention relates to is the material in a kind of metalworking technology field and preparation method thereof, specifically is a kind of no-bake resin sand for sand casting of magnesium alloy and preparation method thereof.
Background technology
In China and world wide, account for more than 80% of castings production total amount with the foundry goods of sand mold production.At 20th century 50-60 before the age, China's sand-cast mainly is by clay-bonded sand and water-glass sand sand casting, from 20th century 60-70 since the age, resin self-setting sand technology is extensively adopted by many cast irons, cast steel and nonferrous alloy Foundry Works, with resin sand produced complex-shaped, dimension precision requirement is very high, surface roughness value is low, more than 50 ton the large-sized water turbine machine rotor steel-casting of weighing, many machine tool plants have adopted resin sand production outlet lathe casting or the like.At present, the production of Mg alloy castings also major part adopts sand casting to form, and most foundry goods is to adopt green casting and clay-bonded sand dry type or half-dry type casting, and it is to adopt the resin self-setting sand casting that the sub-fraction foundry goods is also arranged.
Through being retrieved, prior art finds, (" casting handbook Volume Four Modeling Material " compiled by casting branch of Chinese Mechanical Engineering Society, China Machine Press, 2007) put down in writing in and also rested on the more elementary stage at China's Mg alloy castings with resin self-setting sand at present, only be with reference to cast steel, cast iron and cast aluminium prescription with resin self-setting sand, and to SiO in the silica sand
2Content requirement not high (＞85%), this makes that the impurity in the silica sand is more.
Further retrieval is found, κ. и. Vladimir Portnoi, A.A. being listed as other Jeff exists, " magnesium alloy handbook (Beijing: metallurgical industry publishing house, magnesium alloy is disclosed 1959) because its active characteristic, at high temperature can react with the impurity in the silica sand, liberated heat can further cause magnesium and SiO
2Reaction, cause serious pyrophoricity accident.
Up to the present, the resin self-setting sand that magnesium alloy sand casting is used that is exclusively used in that does not also have report.
Summary of the invention
The present invention is directed to the prior art above shortcomings, a kind of no-bake resin sand for sand casting of magnesium alloy and preparation method thereof is provided, the resin sand for preparing has higher intensity, air permeability and good and a spot of gas forming amount and excellent flame-retardant performance.
The present invention is achieved by the following technical solutions:
The present invention relates to a kind of no-bake resin sand for sand casting of magnesium alloy, the percentage by weight of its component is: thin silica sand 51-100%, thick silica sand 0-50%, resin addition are that the 0.8-2% of thin silica sand and thick silica sand gross weight, 20-60%, the fire retardant addition that the curing agent addition is the resin addition are the 1-5% of thin silica sand and thick silica sand gross weight.
Described thin silica sand and thick silica sand are respectively 30-70 order and 70-200 order, and are the mixing of fresh sand or fresh sand and old sand, wherein: SiO
2Content should be greater than 97%, and clay content is less than 0.2%, and water content is less than 0.2%, and the micro mist amount is less than 1%, and sour consumption value is less than 5mL, and burning decrement is less than 0.5%;
Described resin is a kind of or its combination in furane resins, phenolic resins or the phenolic aldehyde furane resins;
Described curing agent is a kind of or its combination of phosphoric acid, ethyl-sulfate, chlorobenzenesulfonic acid, phenol sulfonic acid, naphthalene sulfonic acids, p-methyl benzenesulfonic acid, xylene monosulfonic acid or benzene sulfonic acid;
Described fire retardant prepares in the following manner: at first according to following percentage by weight batching: boric acid 40-70%, ammonium fluoroborate 10-40%, potassium fluoborate 5-20%, ammonium fluoride 5-20% and sulphur 10-40%, then said components is mixed the back ball milling and made fire retardant in 2-6 hour, its granularity is the 100-300 order.
The present invention relates to the preparation method of above-mentioned no-bake resin sand for sand casting of magnesium alloy, after mixing, prepare no-bake resin sand for sand casting of magnesium alloy so that the order of thin silica sand, thick silica sand, fire retardant, resin and curing agent is reinforced successively.
Described reinforced mixing is meant: adopt puddle mixer, stirring 1-10 minute is mixed in whenever reinforced once back.
Described reinforced mixing is meant: taking by weighing component and mass ratio is that thin silica sand 51-100%, thick silica sand 0-50%, resin addition are that the 0.8-2% of thin silica sand and thick silica sand gross weight, 20-60%, the fire retardant addition that the curing agent addition is the resin addition are the 1-5% of thin silica sand and thick silica sand gross weight.
The present invention prepares the gained resin self-setting sand and has higher intensity, air permeability and good and a spot of gas forming amount.In the casting process,, help obtaining the good Mg alloy castings of surface quality because the adding of fire retardant can stop the impurity reactive combustion in magnesium and silica sand and the silica sand.
The specific embodiment
Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
No-bake resin sand for sand casting of magnesium alloy, its composition quality percentage is: 30-70 order silica sand 51%, and 70-200 order silica sand 49%, the resin addition is 1% of a silica sand gross weight, the curing agent addition is 25% of a resin addition, and the fire retardant addition is 1% of a silica sand gross weight.
After in proportion silica sand being weighed, pour in the puddle mixer, mixed 2 minutes, fire retardant is added, mixed 3 minutes, afterwards resin is added, mixed 3 minutes, at last curing agent is added, mixing shaked out after 1 minute is used for the preparation of core and the cast of Mg alloy castings, and it is good to water the Mg alloy castings surface quality that outpours.
The tensile strength of no-bake resin sand for sand casting of magnesium alloy is 1.5MPa, and gas forming amount is 4.5ml/g, and gas permeability is 350.
Embodiment 2
No-bake resin sand for sand casting of magnesium alloy, its composition quality percentage is: 30-70 order silica sand 70%, and 70-200 order silica sand 30%, the resin addition is 2% of a silica sand gross weight, the curing agent addition is 50% of a resin addition, and the fire retardant addition is 5% of a silica sand gross weight.
After in proportion silica sand being weighed, pour in the puddle mixer, mixed 8 minutes, fire retardant is added, mixed 10 minutes, afterwards resin is added, mixed 8 minutes, at last curing agent is added, mixing shaked out after 5 minutes is used for the preparation of core and the cast of Mg alloy castings, and it is good to water the Mg alloy castings surface quality that outpours.
The tensile strength of no-bake resin sand for sand casting of magnesium alloy is 1.2MPa, and gas forming amount is 8ml/g, and gas permeability is 400.
Embodiment 3
No-bake resin sand for sand casting of magnesium alloy, its composition quality percentage is: 30-70 order silica sand 100%, and 70-200 order silica sand 0%, the resin addition is 1.5% of a silica sand gross weight, the curing agent addition is 40% of a resin addition, and the fire retardant addition is 3% of a silica sand gross weight.
After in proportion silica sand being weighed, pour in the puddle mixer, mixed 4 minutes, fire retardant is added, mixed 6 minutes, afterwards resin is added, mixed 4 minutes, at last curing agent is added, mixing shaked out after 4 minutes is used for the preparation of core and the cast of Mg alloy castings, and it is good to water the Mg alloy castings surface quality that outpours.
The tensile strength of no-bake resin sand for sand casting of magnesium alloy is 1.1MPa, and gas forming amount is 6ml/g, and gas permeability is 460.
Claims (7)
1. no-bake resin sand for sand casting of magnesium alloy, it is characterized in that the percentage by weight of its component is: thin silica sand 51-100%, thick silica sand 0-50%, resin addition are that the 0.8-2% of thin silica sand and thick silica sand gross weight, 20-60%, the fire retardant addition that the curing agent addition is the resin addition are the 1-5% of thin silica sand and thick silica sand gross weight.
2. no-bake resin sand for sand casting of magnesium alloy according to claim 1 is characterized in that, described thin silica sand and thick silica sand are respectively 30-70 order and 70-200 order, and are the mixing of fresh sand or fresh sand and old sand, wherein: SiO
2Content should be greater than 97%, and clay content is less than 0.2%, and water content is less than 0.2%, and the micro mist amount is less than 1%, and sour consumption value is less than 5mL, and burning decrement is less than 0.5%.
3. no-bake resin sand for sand casting of magnesium alloy according to claim 2 is characterized in that, described resin is a kind of or its combination in furane resins, phenolic resins or the phenolic aldehyde furane resins.
4. no-bake resin sand for sand casting of magnesium alloy according to claim 2 is characterized in that, described curing agent is a kind of or its combination of phosphoric acid, ethyl-sulfate, chlorobenzenesulfonic acid, phenol sulfonic acid, naphthalene sulfonic acids, p-methyl benzenesulfonic acid, xylene monosulfonic acid or benzene sulfonic acid.
5. no-bake resin sand for sand casting of magnesium alloy according to claim 2, it is characterized in that, described fire retardant, specifically prepare in the following manner: at first according to following percentage by weight batching: boric acid 40-70%, ammonium fluoroborate 10-40%, potassium fluoborate 5-20%, ammonium fluoride 5-20% and sulphur 10-40%, mix said components the back ball milling then and made fire retardant in 2-6 hour.
6. the preparation method of a no-bake resin sand for sand casting of magnesium alloy according to claim 1, it is characterized in that, after mixing, prepare no-bake resin sand for sand casting of magnesium alloy so that the order of thin silica sand, thick silica sand, fire retardant, resin and curing agent is reinforced successively.
7. the preparation method of no-bake resin sand for sand casting of magnesium alloy according to claim 6 is characterized in that, described reinforced mixing is meant: adopt puddle mixer, stirring 1-10 minute is mixed in whenever reinforced once back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010152282 CN101804443A (en) | 2010-04-21 | 2010-04-21 | No-bake resin sand for sand casting of magnesium alloy and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010152282 CN101804443A (en) | 2010-04-21 | 2010-04-21 | No-bake resin sand for sand casting of magnesium alloy and preparation method thereof |
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| CN 201010152282 Pending CN101804443A (en) | 2010-04-21 | 2010-04-21 | No-bake resin sand for sand casting of magnesium alloy and preparation method thereof |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101992260A (en) * | 2010-11-05 | 2011-03-30 | 中国第一汽车集团公司 | Furan self-hardening resin sand mold for producing integral casting axle case |
| CN102328017A (en) * | 2011-07-13 | 2012-01-25 | 中核苏阀横店机械有限公司 | Resin sand |
| CN103567365A (en) * | 2013-10-11 | 2014-02-12 | 铜陵市经纬流体科技有限公司 | Furan resin self-hardening sand for casting and preparation method thereof |
| CN104107874A (en) * | 2014-07-30 | 2014-10-22 | 吴江市液铸液压件铸造有限公司 | Self-hardening sand additive for casting resin and preparation method of self-hardening sand additive |
| CN104858361A (en) * | 2015-06-13 | 2015-08-26 | 开封东立高压阀门铸造有限公司 | Self-hardening resin-sand double mixing technique |
| CN105414457A (en) * | 2015-11-23 | 2016-03-23 | 合肥李诺新材料贸易有限公司 | Efficient modified alkaline phenolic resin self-hardening sand for thin-walled pump valve casting and preparation method of efficient modified alkaline phenolic resin self-hardening sand |
| CN105414455A (en) * | 2015-11-23 | 2016-03-23 | 合肥李诺新材料贸易有限公司 | High-thermal-stability modified alkaline phenolic resin self-hardening sand for pump valve casting and preparation method of high-thermal-stability modified alkaline phenolic resin self-hardening sand |
| CN104107875B (en) * | 2014-07-30 | 2016-07-06 | 吴江市液铸液压件铸造有限公司 | A kind of furan resin self curing sand and preparation method thereof |
| CN107096869A (en) * | 2017-06-22 | 2017-08-29 | 安徽银力铸造有限公司 | A kind of preparation method of conductive polycrystalline mullite fiber reinforced epoxy sand |
| CN107462696A (en) * | 2017-08-21 | 2017-12-12 | 宁夏共享集团股份有限公司 | A kind of method for determining casting self-hardening furan resin thorough hardening |
| CN107671229A (en) * | 2017-09-30 | 2018-02-09 | 侯马市东鑫机械铸造有限公司 | A kind of hygrometric state resin sand used in iron die sand casting process |
| CN109865792A (en) * | 2019-01-30 | 2019-06-11 | 共享智能铸造产业创新中心有限公司 | A kind of sand mold producing Mg alloy castings |
| CN114273602A (en) * | 2021-12-09 | 2022-04-05 | 上海航天精密机械研究所 | Environment-friendly resin sand for magnesium alloy casting automatic molding production line and preparation method thereof |
| CN114799039A (en) * | 2022-05-31 | 2022-07-29 | 共享智能装备有限公司 | Flame retardant and preparation and use methods thereof |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101992260A (en) * | 2010-11-05 | 2011-03-30 | 中国第一汽车集团公司 | Furan self-hardening resin sand mold for producing integral casting axle case |
| CN102328017A (en) * | 2011-07-13 | 2012-01-25 | 中核苏阀横店机械有限公司 | Resin sand |
| CN103567365A (en) * | 2013-10-11 | 2014-02-12 | 铜陵市经纬流体科技有限公司 | Furan resin self-hardening sand for casting and preparation method thereof |
| CN104107875B (en) * | 2014-07-30 | 2016-07-06 | 吴江市液铸液压件铸造有限公司 | A kind of furan resin self curing sand and preparation method thereof |
| CN104107874A (en) * | 2014-07-30 | 2014-10-22 | 吴江市液铸液压件铸造有限公司 | Self-hardening sand additive for casting resin and preparation method of self-hardening sand additive |
| CN104107874B (en) * | 2014-07-30 | 2016-07-06 | 吴江市液铸液压件铸造有限公司 | A kind of casting resin self-hardening sand additive and preparation method thereof |
| CN104858361A (en) * | 2015-06-13 | 2015-08-26 | 开封东立高压阀门铸造有限公司 | Self-hardening resin-sand double mixing technique |
| CN105414455A (en) * | 2015-11-23 | 2016-03-23 | 合肥李诺新材料贸易有限公司 | High-thermal-stability modified alkaline phenolic resin self-hardening sand for pump valve casting and preparation method of high-thermal-stability modified alkaline phenolic resin self-hardening sand |
| CN105414457A (en) * | 2015-11-23 | 2016-03-23 | 合肥李诺新材料贸易有限公司 | Efficient modified alkaline phenolic resin self-hardening sand for thin-walled pump valve casting and preparation method of efficient modified alkaline phenolic resin self-hardening sand |
| CN107096869A (en) * | 2017-06-22 | 2017-08-29 | 安徽银力铸造有限公司 | A kind of preparation method of conductive polycrystalline mullite fiber reinforced epoxy sand |
| CN107462696A (en) * | 2017-08-21 | 2017-12-12 | 宁夏共享集团股份有限公司 | A kind of method for determining casting self-hardening furan resin thorough hardening |
| CN107671229A (en) * | 2017-09-30 | 2018-02-09 | 侯马市东鑫机械铸造有限公司 | A kind of hygrometric state resin sand used in iron die sand casting process |
| CN109865792A (en) * | 2019-01-30 | 2019-06-11 | 共享智能铸造产业创新中心有限公司 | A kind of sand mold producing Mg alloy castings |
| CN114273602A (en) * | 2021-12-09 | 2022-04-05 | 上海航天精密机械研究所 | Environment-friendly resin sand for magnesium alloy casting automatic molding production line and preparation method thereof |
| CN114799039A (en) * | 2022-05-31 | 2022-07-29 | 共享智能装备有限公司 | Flame retardant and preparation and use methods thereof |
| CN114799039B (en) * | 2022-05-31 | 2024-03-19 | 共享智能装备有限公司 | Flame retardant and preparation and use methods thereof |
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Application publication date: 20100818 |