CN104148591A - Core making process - Google Patents
Core making process Download PDFInfo
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- CN104148591A CN104148591A CN201410433302.8A CN201410433302A CN104148591A CN 104148591 A CN104148591 A CN 104148591A CN 201410433302 A CN201410433302 A CN 201410433302A CN 104148591 A CN104148591 A CN 104148591A
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Abstract
The invention provides a core making process, and applied to cores for casting shafts of engine cylinders. As a precoated sand formula and core curing process parameters are improved, the generation rate of the casting air hole defect, particular the invasive air hole defect is effectively reduced, the air hole rejection rate and the comprehensive rejection rate are effectively controlled, and the production efficiency is improved.
Description
Technical field
The present invention relates to a kind of casting technique, particularly a kind of engine cylinder-body that is applicable to is cast the core manufacturing craft of core body with axle part.
Background technology
Gas hole defect is one of defect common in casting technique, and particularly in the prior art, owing to having adopted high gas forming amount, the poor precoated sand of venting quality to carry out coremaking, on the foundry goods that is difficult for design exhaust measure, application is very easy to cause impouring gas hole defect; And the general intensity of the low precoated sand of getting angry is lower, can not effectively guarantee foundry goods shape.
In addition, in prior art, for the technological improvement of gas hole defect, take precoated sand formula as main, and control to core body curing process parameter can reach the object that reduces precoated sand gas forming amount equally.
Summary of the invention
For problems of the prior art, the invention provides a kind of core manufacturing craft, from improving precoated sand formula and core manufacturing craft two aspects, start with, reach the object that bleb is controlled.Specific as follows:
A core manufacturing craft, is characterized in that, comprises the following steps:
A. sand processed: puddle mixer start, roughing sand is preheated to 120-850 ℃, puddle mixer adds hot sand, in 25-40S, evenly add binding agent and plasticizer and coupling agent, start overlay film simultaneously, after 50-90S, spray into curing agent, after 30-40S, add lubricant, after air-cooled 60-80S, start to shake out, broken and screening.。
B. solidify: the precoated sand obtaining through steps A is added and solidifies machine and be cured, and solidifying machine core shooting pressure is 0.4 ± 0.1Mpa, 230 ± 20 ℃ of solidification temperatures, hardening time 100 ± 20S.
As preferably, described in steps A, binding agent is the 1.0-3.0% of roughing sand weight, the 40-60% that curing agent is weight of binder, the 0.50-0.80% that coupling agent is weight of binder, lubricant is the 40-60% of weight of binder, the 5.0-8.0% that plasticizer is weight of binder.
As preferably, the curing machine core shooting pressure described in step B is 0.4Mpa, and solidification temperature is 230 ℃, and be 110S hardening time.
As preferably, the bonding agent consumption described in steps A is 1.26% of roughing sand weight, and curing agent is weight of binder 32%, and coupling agent is weight of binder 2.5%, and lubricant is weight of binder 20%, and plasticizer is weight of binder 5.2%
After sand flow journey processed described in steps A completes, can obtain hot bending strength is 1.0-2.5MPa, and normal temperature bending strength is 1.5-5.0MPa, and fusing point is 100 ± 5 ℃, the precoated sand that igloss amount is 1.5-3.3%.Compared with prior art, the advantage of this precoated sand is that calorific intensity is high, collapsibility, pliability is good and gas forming amount is low, gas permeability is high, is easy to consolidation, can meet surface quality and the mechanical property of foundry goods.Curing flow process described in step B, compared with prior art, has adopted lower heating-up temperature and has extended hardening time, avoids the strength decreased that causes because of core vulnerable area bonding agent scaling loss, is conducive to strengthen sand core strength, has reduced casting gas forming amount.
Compared with prior art, beneficial effect of the present invention is: a kind of core manufacturing craft is provided, by precoated sand formula and core body curing process parameter are improved, effectively reduced the particularly incidence of blowhole defect of bleb defect, pore percent defective and comprehensive percent defective have been carried out to effective control, improved production efficiency.
The specific embodiment
For making above-mentioned purpose of the present invention, feature and advantage perspicuousness more, below in conjunction with the invention will be further described with the specific embodiment,
The specific embodiment one: a kind of core manufacturing craft that is applied to engine oil channel core, comprise the following steps: prepare roughing sand 40/70 order, bonding agent consumption is 1.26% of roughing sand weight, curing agent is 32% of weight of binder, coupling agent is 2.5% of weight of binder, lubricant is 20% of weight of binder, and plasticizer is weight of binder 5.2%.Puddle mixer start, is preheated to 130 ℃ by roughing sand, and puddle mixer adds hot sand, evenly adds binding agent and plasticizer and coupling agent in 30S, starts overlay film simultaneously, sprays into curing agent after 60S, adds lubricant after 40S, after air-cooled 70S, starts to shake out, broken and screening.After sand processed completes, add curing machine, adjust solidifying machine core shooting pressure is 0.4Mpa, 240 ℃ of solidification temperatures, hardening time 80S.Core body after making is applied to, after casting, make gas hole defect be reduced to 1.8% by 30%.
The specific embodiment two: a kind of core manufacturing craft that is applied to engine water channel core, comprise the following steps: prepare roughing sand 40/70 order, bonding agent consumption is 1.26% of roughing sand weight, curing agent is 35% of weight of binder, coupling agent is 3% of weight of binder, lubricant is 21% of weight of binder, and plasticizer is weight of binder 5.3%.Puddle mixer start, is preheated to 125 ℃ by roughing sand, and puddle mixer adds hot sand, evenly adds binding agent and plasticizer and coupling agent in 25S, starts overlay film simultaneously, sprays into curing agent after 50S, adds lubricant after 40S, after air-cooled 70S, starts to shake out, broken and screening.After sand processed completes, add curing machine, adjust solidifying machine core shooting pressure is 0.4Mpa, 230 ℃ of solidification temperatures, hardening time 110S.Core body after making is applied to, after casting, make gas hole defect be reduced to 1.8% by 30%.Core body after making is applied to, after casting, make gas hole defect be reduced to 0.3% by 10%.
The specific embodiment three: a kind of core manufacturing craft that is applied to engine water channel core and oil duct core, comprise the following steps: prepare roughing sand 40/70 order, bonding agent consumption is 1.46% of roughing sand weight, curing agent is 36% of weight of binder, coupling agent is 2.5% of weight of binder, lubricant is 20% of weight of binder, and plasticizer is weight of binder 5.2%.Puddle mixer start, is preheated to 135 ℃ by roughing sand, and puddle mixer adds hot sand, evenly adds binding agent and plasticizer and coupling agent in 25S, starts overlay film simultaneously, sprays into curing agent after 50S, adds lubricant after 40S, after air-cooled 70S, starts to shake out, broken and screening.After sand processed completes, add curing machine, adjust solidifying machine core shooting pressure is 0.4Mpa, 230 ℃ of solidification temperatures, hardening time 100S.Core body after making is applied to, after casting, make gas hole defect be reduced to 0.5% by 4%.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any modifications of making within the spirit and principles in the present invention, be equal to and replace or improvement etc., be all included in protection scope of the present invention.
Claims (4)
1. a core manufacturing craft, is characterized in that, comprises the following steps:
A. sand processed: puddle mixer start, roughing sand is preheated to 120-850 ℃, puddle mixer adds hot sand, in 25-40S, evenly add binding agent and plasticizer and coupling agent, start overlay film simultaneously, after 50-90S, spray into curing agent, after 30-40S, add lubricant, after air-cooled 60-80S, start to shake out, broken and screening.
B. solidify: the precoated sand obtaining through steps A is added and solidifies machine and be cured, and solidifying machine core shooting pressure is 0.4 ± 0.1Mpa, 230 ± 20 ℃ of solidification temperatures, hardening time 100 ± 20S.
2. a kind of core manufacturing craft as claimed in claim 1, it is characterized in that: described in steps A, binding agent is the 1.0-3.0% of roughing sand weight, curing agent is the 40-60% of weight of binder, coupling agent is the 0.50-0.80% of weight of binder, lubricant is the 40-60% of weight of binder, the 5.0-8.0% that plasticizer is weight of binder.
3. a kind of core manufacturing craft as claimed in claim 1, is characterized in that: the curing machine core shooting pressure described in step B is 0.4Mpa, and solidification temperature is 230 ℃, and be 110S hardening time.
4. a kind of core manufacturing craft as claimed in claim 2, it is characterized in that: the bonding agent consumption described in steps A is 1.26% of roughing sand weight, curing agent is 32% of weight of binder, coupling agent is 2.5% of weight of binder, lubricant is 20% of weight of binder, and plasticizer is weight of binder 5.2%
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410433302.8A CN104148591A (en) | 2014-08-29 | 2014-08-29 | Core making process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410433302.8A CN104148591A (en) | 2014-08-29 | 2014-08-29 | Core making process |
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| CN104148591A true CN104148591A (en) | 2014-11-19 |
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| CN201410433302.8A Pending CN104148591A (en) | 2014-08-29 | 2014-08-29 | Core making process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104646604A (en) * | 2015-01-09 | 2015-05-27 | 通辽市大林型砂有限公司 | Precoated sand for molten metal characteristic analysis sample cup |
| CN104785711A (en) * | 2015-04-30 | 2015-07-22 | 成都桐林铸造实业有限公司 | Casting process |
| CN104785709A (en) * | 2015-04-30 | 2015-07-22 | 成都桐林铸造实业有限公司 | Precoated sand for casting and preparation method thereof |
| CN104785722A (en) * | 2015-04-30 | 2015-07-22 | 成都桐林铸造实业有限公司 | Core production process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0523794A (en) * | 1991-07-17 | 1993-02-02 | Mazda Motor Corp | Method and apparatus for making sand core |
| CN1083752A (en) * | 1993-08-31 | 1994-03-16 | 秦升益 | A kind of compound technology for filming sand |
| CN1274626A (en) * | 2000-06-13 | 2000-11-29 | 秦升益 | Preparation process of heat resisting film-coating sand |
| CN1513621A (en) * | 2003-07-08 | 2004-07-21 | 东风汽车公司 | Production method of covering film sand core for investment casting |
| CN103600024A (en) * | 2013-11-28 | 2014-02-26 | 吴江市液铸液压件铸造有限公司 | Precoated sand mixing process |
-
2014
- 2014-08-29 CN CN201410433302.8A patent/CN104148591A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0523794A (en) * | 1991-07-17 | 1993-02-02 | Mazda Motor Corp | Method and apparatus for making sand core |
| CN1083752A (en) * | 1993-08-31 | 1994-03-16 | 秦升益 | A kind of compound technology for filming sand |
| CN1274626A (en) * | 2000-06-13 | 2000-11-29 | 秦升益 | Preparation process of heat resisting film-coating sand |
| CN1513621A (en) * | 2003-07-08 | 2004-07-21 | 东风汽车公司 | Production method of covering film sand core for investment casting |
| CN103600024A (en) * | 2013-11-28 | 2014-02-26 | 吴江市液铸液压件铸造有限公司 | Precoated sand mixing process |
Non-Patent Citations (1)
| Title |
|---|
| 严倪: "铸造中覆膜砂制芯工艺的应用", 《科学之友》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104646604A (en) * | 2015-01-09 | 2015-05-27 | 通辽市大林型砂有限公司 | Precoated sand for molten metal characteristic analysis sample cup |
| CN104785711A (en) * | 2015-04-30 | 2015-07-22 | 成都桐林铸造实业有限公司 | Casting process |
| CN104785709A (en) * | 2015-04-30 | 2015-07-22 | 成都桐林铸造实业有限公司 | Precoated sand for casting and preparation method thereof |
| CN104785722A (en) * | 2015-04-30 | 2015-07-22 | 成都桐林铸造实业有限公司 | Core production process |
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Application publication date: 20141119 |
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| RJ01 | Rejection of invention patent application after publication |