CN103600022A - Precoated sand capable of preventing nozzle from leaking sand - Google Patents
Precoated sand capable of preventing nozzle from leaking sand Download PDFInfo
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- CN103600022A CN103600022A CN201310606143.2A CN201310606143A CN103600022A CN 103600022 A CN103600022 A CN 103600022A CN 201310606143 A CN201310606143 A CN 201310606143A CN 103600022 A CN103600022 A CN 103600022A
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- sand
- precoated sand
- microcrystalline wax
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Abstract
The invention provides precoated sand capable of preventing a nozzle from leaking sand. The precoated sand comprises crude sand, an adhesive, a curing agent and a lubricating agent, and is characterized by further comprising microcrystalline wax with the weight content of 0.1-0.3%. Compared with the conventional precoated sand, the precoated sand has the advantages that a certain amount of microcrystalline wax is added into the precoated sand; the melting point of the microcrystalline wax is about 65-90 DEG C which is consistent with that of the core making nozzle, so that the microcrystalline wax is melted at the core making temperature, and the fluidity of the precoated sand is greatly reduced; furthermore, the microcrystalline wax is volatilized in the core making process, so that side effects are not caused for the later pouring, and the problem of sand leakage of the nozzle caused by the high fluidity of the precoated sand can be further solved.
Description
Technical field
The present invention relates to a kind of precoated sand, relate in particular to a kind of nozzle that prevents that contains microcrystalline wax and leak the precoated sand of sand.
Background technology
Precoated sand is shell mould microcast process Modeling Material, has keeping quality good, and the features such as the casting dimension accuracy height of production and any surface finish, can be used for the production of cast steel, cast iron, alloy-steel casting and non-ferrous casting.Precoated sand be take quartz sand conventionally as roughing sand, is aided with binding agent and curing agent is formulated.But when with precoated sand coremaking, because the mobility of precoated sand is better, when lifting core shooting mouth after core shooting, there will be nozzle to leak the situation of sand, thereby affect quality and the moulding of core shooting, is one of subject matter of current casting core process.At present, in order to prevent that nozzle from leaking sand, the main method of taking has: 1) on core shooting mouth, add rubber sleeve, but the easy heat damage of rubber sleeve is changed trouble, has affected production efficiency, has increased cost; 2) in precoated sand, add humectant, the whole mobility that reduces precoated sand, but this can cause core shooting unreal, occurs scab during cast, and cast(ing) surface is coarse.
Microcrystalline wax is through solvent refining, solvent dewaxing or make slack wax through wax freezing and crystallizing, squeezing dewaxing, then through solvent deoiling or sweating de-oiling, and the post-refining sheet or the acicular crystal that make from the lube cut of crude distillation gained.The fusing point of microcrystalline wax is approximately 65～90 ℃, basically identical with the temperature of casting machine nozzle.At this temperature, microcrystalline wax can melt.
Summary of the invention
In order to solve in prior art because precoated sand mobility is leaked sand problem compared with the nozzle causing greatly, the inventor, through groping in a large number, provides a kind of and can prevent that nozzle from leaking precoated sand of sand and preparation method thereof.
On the one hand, the invention provides a kind of precoated sand that prevents nozzle leakage sand, comprise roughing sand, binding agent, curing agent and lubricant, it is characterized in that: described precoated sand also comprises that weight content is 0.1～0.3% microcrystalline wax.
As the improvement to technique scheme, proportioning is as follows by weight for each component of above-mentioned precoated sand: binding agent 2～2.5%; Curing agent 0.3～0.4%; Lubricant 0.15～0.2%; Microcrystalline wax 0.1～0.3%; Surplus is roughing sand.
As the improvement to technique scheme, the binding agent described in above-mentioned precoated sand is phenolic resins; Described curing agent is methenamine; Described lubricant is calcium stearate.
As a kind of preferred embodiment of technique scheme, the consumption of described microcrystalline wax is preferably 5～7% of described phenolic resins weight content.
On the other hand, the invention provides a kind of above-mentioned precoated sand preparation technology who prevents nozzle leakage sand, comprising:
(1) according to the percentage by weight of each component of precoated sand of required preparation, form, a certain amount of microcrystalline wax and mix lubricant is even, standby;
(2) heating roughing sand, joins puddle mixer by the roughing sand after heating;
(3) according to the percentage by weight of each component of precoated sand of required preparation, form, in puddle mixer, add binding agent, it is melted, fully overlay film;
(4) according to the percentage by weight of each component of precoated sand of required preparation, form, add curing agent solution, stir;
(5) treat in puddle mixer, after moisture evaporation, to add the prepared microcrystalline wax of step (1) and the mixture of lubricant, stir;
(6) mixture in cooling puddle mixer and broken, sieve, obtain finished product precoated sand.
In precoated sand of the present invention, added a certain amount of microcrystalline wax, because the fusing point of microcrystalline wax is approximately 65～90 ℃, basically identical with the temperature of core making machine nozzle, at this temperature, microcrystalline wax can melt, and the mobility of precoated sand is significantly reduced, and because microcrystalline wax can vapor away in coremaking process, can not bring side effect to later stage cast, thereby solved the nozzle causing greatly due to precoated sand mobility, leak sand problem.And, in penetrating sand mouth, only have the microcrystalline wax directly contacting with nozzle just to melt, therefore only have the seldom precoated sand mobility variation of part, the mobility of other precoated sand is unaffected, therefore also can not affect coremaking quality.In addition, the preparation technology of precoated sand of the present invention is simple, and cost is low, and suitability for mass industrializedization is produced.
The specific embodiment
Below with reference to embodiment, describe the present invention in detail.Other objects of the present invention and advantage can become clearer by the description with reference to embodiment.
In the present invention, described roughing sand can be common silica sand, magnesia, wrong sand, chromite sand, emergy or their mixed sand.In actual needs, in order to improve high-temperature behavior and the normal temperature performance of precoated sand, and further reduce resin amount, also can use washed-out sand, pickling sand or roasting sand.
In the present invention, according to actual casting needs, can also in precoated sand, add the conventional additive in this area.The Main Function of additive is the performance of improving precoated sand.Now widely used additive mainly contains coupling agent, high temperature resistant additive, easy defeated and dispersed additive, strengthens flexibilizer additive, anti-stick sand additive and hygrometric state additive etc.
Generally adopt at present thermoplastic phenolic resinoid as precoated sand binding agent, but those skilled in the art can select the most applicable binding agent according to the needs of actual casting, for example, can adopt the resin dedicated of different performance, as high strength is low, get angry resin, easy defeated and dispersed resin etc., also can adopt modified polyester resin to substitute phenolic resins.
The curing agent of precoated sand routine is methenamine, and its addition is relevant to consumption of binder.For meeting some specific (special) requirements (as anti-hulling, fast poly-speed etc.), those skilled in the art can, according to actual casting needs, select existing extraordinary curing agent in prior art.
The Main Function of precoated sand lubricant is to prevent caking, and improves mobility and the release property of precoated sand.In this area, conventional lubricant mainly contains calcium stearate, stearic acid milling ammonium etc.
If not otherwise specified, the operating condition such as consumption in the present invention and temperature all adopts conventional parameter in the art.
Embodiment 1:
(1) take 155g microcrystalline wax and 103g calcium stearate, mix, standby;
(2) 50kg Inner Mongol great Lin roughing sand 50/100 is heated to 125 ℃, joins in puddle mixer;
(3) in the roughing sand of heating, add 1.03kg phenolic resin adhesive, and stir, make phenolic resins fusing, fully overlay film;
(4) add methenamine solution, wherein contain methenamine 206g;
(5) add hot mixt, after making moisture evaporation, the microcrystalline wax and the calcium stearate mixture that add step (1) to get ready;
(6) cooling said mixture and broken, sieve, obtain finished product precoated sand.
Embodiment 2:
(1) take 51.5g microcrystalline wax and 77.5g calcium stearate, mix, standby;
(2) 50kg Inner Mongol great Lin roughing sand 50/100 is heated to 125 ℃, joins in puddle mixer;
(3) in the roughing sand of heating, add 1.29kg phenolic resin adhesive, and stir, make phenolic resins fusing, fully overlay film;
(4) add methenamine solution, wherein contain methenamine 155g;
(5) add hot mixt, after making moisture evaporation, the microcrystalline wax and the calcium stearate mixture that add step (1) to get ready;
(6) cooling said mixture and broken, sieve, obtain finished product precoated sand.
Embodiment 3:
(1) take 59g microcrystalline wax and 93g calcium stearate, mix, standby;
(2) 50kg Inner Mongol great Lin roughing sand 50/100 is heated to 125 ℃, joins in puddle mixer;
(3) in the roughing sand of heating, add 1.18kg phenolic resin adhesive, and stir, make phenolic resins fusing, fully overlay film;
(4) add methenamine solution, wherein contain methenamine 180g;
(5) add hot mixt, after making moisture evaporation, the microcrystalline wax and the calcium stearate mixture that add step (1) to get ready;
(6) cooling said mixture and broken, sieve, obtain finished product precoated sand.
Embodiment 4:
(1) take 82.6g microcrystalline wax and 98g calcium stearate, mix, standby;
(2) 50kg Inner Mongol great Lin roughing sand 50/100 is heated to 125 ℃, joins in puddle mixer;
(3) in the roughing sand of heating, add 1.18kg phenolic resin adhesive, and stir, make phenolic resins fusing, fully overlay film;
(4) add methenamine solution, wherein contain methenamine 180g;
(5) add hot mixt, after making moisture evaporation, the microcrystalline wax and the calcium stearate mixture that add step (1) to get ready;
(6) cooling said mixture and broken, sieve, obtain finished product precoated sand.
Comparing embodiment 1:
(1) take 103g calcium stearate, mix, standby;
(2) 50kg Inner Mongol great Lin roughing sand 50/100 is heated to 125 ℃, joins in puddle mixer;
(3) in the roughing sand of heating, add 1.03kg phenolic resin adhesive, and stir, make phenolic resins fusing, fully overlay film;
(4) add methenamine solution, wherein contain methenamine 206g;
(5) add hot mixt, after making moisture evaporation, the calcium stearate that adds step (1) to get ready;
(6) cooling said mixture and broken, sieve, obtain finished product precoated sand.
Comparing embodiment 2:
(1) take 77.5g calcium stearate, mix, standby;
(2) 50kg Inner Mongol great Lin roughing sand 50/100 is heated to 125 ℃, joins in puddle mixer;
(3) in the roughing sand of heating, add 1.29kg phenolic resin adhesive, and stir, make phenolic resins fusing, fully overlay film;
(4) add methenamine solution, wherein contain methenamine 155g;
(5) add hot mixt, after making moisture evaporation, the calcium stearate that adds step (1) to get ready;
(6) cooling said mixture and broken, sieve, obtain finished product precoated sand.
Comparing embodiment 3:
(1) take 93g calcium stearate, mix, standby;
(2) 50kg Inner Mongol great Lin roughing sand 50/100 is heated to 125 ℃, joins in puddle mixer;
(3) in the roughing sand of heating, add 1.18kg phenolic resin adhesive, and stir, make phenolic resins fusing, fully overlay film;
(4) add methenamine solution, wherein contain methenamine 180g;
(5) add hot mixt, after making moisture evaporation, add step (1) calcium stearate;
(6) cooling said mixture and broken, sieve, obtain finished product precoated sand.
Comparing embodiment 4:
(1) take 98g calcium stearate, mix, standby;
(2) 50kg Inner Mongol great Lin roughing sand 50/100 is heated to 125 ℃, joins in puddle mixer;
(3) in the roughing sand of heating, add 1.18kg phenolic resin adhesive, and stir, make phenolic resins fusing, fully overlay film;
(4) add methenamine solution, wherein contain methenamine 180g;
(5) add hot mixt, after making moisture evaporation, add step (1) calcium stearate;
(6) cooling said mixture and broken, sieve, obtain finished product precoated sand.
Performance Detection
Normal temperature precoated sand mobility:
At normal temperatures, 100g precoated sand is poured in the triangular funnel that lower port diameter is 8mm, metering precoated sand starts to flow out to the time (to calculate second) of having stayed, and is mobility-detected, and the time is shorter, shows that mobility is better.
60 ℃ of precoated sand mobility:
Funnel is put into the insulating box of 60 ℃, 100g precoated sand is poured in the triangular funnel that lower port diameter is 8mm, metering precoated sand starts to flow out to the time (to calculate second) of having stayed, and is mobility-detected, and the time is shorter, shows that mobility is better.
Table 1: mobility-detected result
| ? | Normal temperature precoated sand mobility (s) | 60 ℃ of precoated sand mobility (s) |
| Embodiment 1 | 24 | 60 |
| Comparing embodiment 1 | 25 | 30 |
| Embodiment 2 | 23 | 62 |
| Comparing embodiment 2 | 25 | 34 |
| Embodiment 3 | 26 | 67 |
| Comparing embodiment 3 | 25 | 30 |
| Embodiment 4 | 23 | 70 |
| Comparing embodiment 4 | 24 | 33 |
Mobility-detected result shows, at normal temperatures, adds the precoated sand of microcrystalline wax consistent with the precoated sand mobility that does not add microcrystalline wax.But in the time of 60 ℃, the precoated sand mobility that adds microcrystalline wax is starkly lower than the mobility of the precoated sand that does not add microcrystalline wax, thus solved to a certain extent cast in because precoated sand mobility is leaked sand problem compared with the nozzle causing greatly.
The embodiment of the present invention, just in order to understand better technical scheme of the present invention, should not be construed as limitation of the present invention.Without departing from the spirit and substance of the case in the present invention, the modification that method of the present invention, step or condition are done or replacement, all belong to scope of the present invention.If do not specialize, the conventional means that in embodiment, technological means used is well known to those skilled in the art.
Claims (5)
1. prevent that nozzle from leaking a precoated sand for sand, comprise roughing sand, binding agent, curing agent and lubricant, it is characterized in that: described precoated sand also comprises that weight content is 0.1～0.3% microcrystalline wax.
2. a precoated sand that prevents nozzle leakage sand as claimed in claim 1, is characterized in that, each component by weight proportioning is as follows: binding agent 2～2.5%; Curing agent 0.3～0.4%; Lubricant 0.15～0.2%; Microcrystalline wax 0.1～0.3%; Surplus is roughing sand.
3. a precoated sand that prevents nozzle leakage sand as claimed in claim 2, is characterized in that: described binding agent is phenolic resins; Described curing agent is methenamine; Described lubricant is calcium stearate.
4. a precoated sand that prevents nozzle leakage sand as claimed in claim 3, is characterized in that: the consumption of described microcrystalline wax is 5～7% of described phenolic resins weight content.
5. the nozzle that prevents as described in above-mentioned arbitrary claim leaks a precoated sand preparation technology for sand, it is characterized in that comprising:
(1) according to the percentage by weight of each component of precoated sand of required preparation, form, a certain amount of microcrystalline wax and mix lubricant is even, standby;
(2) heating roughing sand, joins puddle mixer by the roughing sand after heating;
(3) according to the percentage by weight of each component of precoated sand of required preparation, form, in puddle mixer, add binding agent, it is melted, fully overlay film;
(4) according to the percentage by weight of each component of precoated sand of required preparation, form, add curing agent solution, stir;
(5) treat in puddle mixer, after moisture evaporation, to add the prepared microcrystalline wax of step (1) and the mixture of lubricant, stir;
(6) mixture in cooling puddle mixer and broken, sieve, obtain finished product precoated sand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310606143.2A CN103600022B (en) | 2013-11-25 | 2013-11-25 | Precoated sand capable of preventing nozzle from leaking sand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310606143.2A CN103600022B (en) | 2013-11-25 | 2013-11-25 | Precoated sand capable of preventing nozzle from leaking sand |
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| Publication Number | Publication Date |
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| CN103600022A true CN103600022A (en) | 2014-02-26 |
| CN103600022B CN103600022B (en) | 2015-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310606143.2A Active CN103600022B (en) | 2013-11-25 | 2013-11-25 | Precoated sand capable of preventing nozzle from leaking sand |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106077427A (en) * | 2016-07-29 | 2016-11-09 | 无锡市三峰仪器设备有限公司 | A kind of Mo-phenolic resin precoated sand material of instrument casting |
| CN106238667A (en) * | 2016-07-29 | 2016-12-21 | 无锡市三峰仪器设备有限公司 | A kind of precoated sand of instrument casting |
| CN107262662A (en) * | 2017-06-15 | 2017-10-20 | 柳州市柳晶科技股份有限公司 | A kind of thermostable cast steel precoated sand |
| CN107377865A (en) * | 2017-08-07 | 2017-11-24 | 伊婕 | A kind of novel film coating sand and preparation method thereof |
| CN108296413A (en) * | 2017-08-25 | 2018-07-20 | 柳州市柳晶科技股份有限公司 | A kind of heat resisting film-coating sand and preparation method thereof |
| CN108971417A (en) * | 2018-10-08 | 2018-12-11 | 南阳仁创砂业科技有限公司 | A kind of precoated sand and preparation method thereof of steel-casting chill |
| CN112139444A (en) * | 2019-06-27 | 2020-12-29 | 南京辉腾机械铸造有限公司 | Resin sand regeneration surface treatment method |
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| GB842632A (en) * | 1956-12-17 | 1960-07-27 | Hooker Electrochemical Co | Phenolic resin coating process |
| JPS5686644A (en) * | 1979-12-17 | 1981-07-14 | Mitsubishi Heavy Ind Ltd | Production of mold |
| CN201693140U (en) * | 2010-06-03 | 2011-01-05 | 新兴重工湖北三六一一机械有限公司 | Core-shooting self-closing sand-shooting nozzle |
| CN101927318A (en) * | 2010-09-03 | 2010-12-29 | 吴江市液铸液压件铸造有限公司 | High strength precoated sand |
| CN102688977B (en) * | 2012-06-12 | 2014-09-03 | 西峡县众德汽车部件有限公司 | High-strength core-preparing precoated sand and preparation process thereof |
| CN202683975U (en) * | 2012-08-08 | 2013-01-23 | 海安县万力铸造有限公司 | Leakage-proof sand shooting plate for iron mould sand covering production |
| CN102921878B (en) * | 2012-11-14 | 2015-02-18 | 中国重汽集团济南动力有限公司 | Precoated sand and preparation method thereof |
| CN103231011A (en) * | 2013-04-16 | 2013-08-07 | 繁昌县恒鑫汽车零部件有限公司 | Phenol formaldehyde resin precoated sand |
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- 2013-11-25 CN CN201310606143.2A patent/CN103600022B/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106077427A (en) * | 2016-07-29 | 2016-11-09 | 无锡市三峰仪器设备有限公司 | A kind of Mo-phenolic resin precoated sand material of instrument casting |
| CN106238667A (en) * | 2016-07-29 | 2016-12-21 | 无锡市三峰仪器设备有限公司 | A kind of precoated sand of instrument casting |
| CN107262662A (en) * | 2017-06-15 | 2017-10-20 | 柳州市柳晶科技股份有限公司 | A kind of thermostable cast steel precoated sand |
| CN107262662B (en) * | 2017-06-15 | 2020-01-21 | 柳州市柳晶科技股份有限公司 | Super high temperature resistant cast steel precoated sand |
| CN107377865A (en) * | 2017-08-07 | 2017-11-24 | 伊婕 | A kind of novel film coating sand and preparation method thereof |
| CN108296413A (en) * | 2017-08-25 | 2018-07-20 | 柳州市柳晶科技股份有限公司 | A kind of heat resisting film-coating sand and preparation method thereof |
| CN108296413B (en) * | 2017-08-25 | 2019-11-05 | 柳州柳晶环保科技有限公司 | A kind of heat resisting film-coating sand and preparation method thereof |
| CN108971417A (en) * | 2018-10-08 | 2018-12-11 | 南阳仁创砂业科技有限公司 | A kind of precoated sand and preparation method thereof of steel-casting chill |
| CN112139444A (en) * | 2019-06-27 | 2020-12-29 | 南京辉腾机械铸造有限公司 | Resin sand regeneration surface treatment method |
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