CN105014012A - Lost foam manufacturing technology - Google Patents
Lost foam manufacturing technology Download PDFInfo
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- CN105014012A CN105014012A CN201510445230.3A CN201510445230A CN105014012A CN 105014012 A CN105014012 A CN 105014012A CN 201510445230 A CN201510445230 A CN 201510445230A CN 105014012 A CN105014012 A CN 105014012A
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- preparation technology
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Abstract
The invention provides a lost foam manufacturing technology. The step (6) and the step (7) are conducted under action of vacuumizing. In the step (7), vacuumizing is stopped after being conducted for a certain period; internal heat diffuses outwards through heat conduction, so that castings are subjected to failure handling one time, residual stress in the castings can be eliminated, and the mechanical performance of the castings is enhanced. Besides, by means of the lost foam manufacturing technology, the production efficiency can be improved by more than 35%, the qualified rate of the castings reaches 98.7%, and the product quality meets relevant national standards. Compared with the prior art, the effect is improved remarkably, and upon inspection, the quality of castings is greatly improved.
Description
Technical field
The invention belongs to metal casting technique field, particularly relate to a kind of preparation technology of evaporative pattern.
Background technology
Lost foam casting is described as " 21 century casting technology " and " green casting technology ", in casting iron field extensive use and popularization, casting quality is greatly improved, make client expect continuous enhancing to steel-casting quality, impel cast steel enterprise especially medium-sized and small enterprises drop into more and more in Technology of EPC.
Technology of EPC is that foamed plastic model similar for casting dimension shape bonding is combined into model cluster, after map brushing refractory coating is also dried, be embedded in vibration molding in drystone sand, pour into a mould liquid metals under certain condition, model gasified and occupies modal position, after solidifying cooling, forming the method for required foundry goods.
Compared with traditional foundry engieering, owing to adopting the foamed plastics analogue formation very easily gasified, without the need to delivery with making core rod, without die joint, thus non-trimming burr, this technical process has abandoned traditional handicraft complex procedures, course of work pollutant discharge amount is large, labor strength is high unfavorable factor completely, what realize is that a kind of operation is simple, and efficiency is high, nearly non-harmful cleaner production.Production line is simple and practical, and the technological transformation of small investment, especially applicable old factory building, capital construction mainly drops on knockout and the sand process Ministry of worker, and therefore construction area and construction volume are all less.Can adopt duty, can adopt stage duty again, production line operation is simple, and management easily.
As application number for: 201410700342.4 a kind of lost foam casting process of providing, this technique is mainly in order to adapt to the lost foam casting of multi items, small lot, multiple alloy and the trade mark, this production efficiency is high, and safety and environmental protection, its obtained finished product cast quality and anti-corrosion performance have to be hoisted.
Summary of the invention
In order to overcome the problems referred to above, the invention provides a kind of preparation technology of evaporative pattern.
For achieving the above object, technical scheme provided by the invention is:
A preparation technology for evaporative pattern, comprises the following steps:
1) production Foam Pattern or running gate system in forming machine;
2) by bonding to apperance and running channel become mould bundle module;
3) use coating machine to carry out leaching to mould bundle module and hang water based paint;
4) dry coating, carry out drying in drying chamber air draft;
5) mould bundle module is put into sandbox, insert dry sand;
6) casting forming under suction function;
7) after casting, with continue to vacuumize several minutes under the identical negative pressure of step 6) and harden to cast(ing) surface after, fully cool;
8), after foundry goods cooling, take out and carry out knockout and the cleaning of excision casting head of casting;
Wherein:
1/13 of the minimum wall thickness (MINI W.) of the particle diameter≤foundry goods of the material bead that Foam Pattern described in step 1) is selected, density is 28kg/m3.
In step 1), Foam Pattern adopts following technique:
1. use air compressor by steam pre-foaming, raw material is sent out in advance;
2. the bead through prefoam is placed on drying, the feed bin of ventilation carries out slaking, and the curing time is 59 hours;
3. the material bead after step 2. slaking is placed in the environment of 70 DEG C, dries 1.4h;
4. metal foaming mould production Foam Pattern or running gate system is used.
In step 1), described Foam Pattern raw material is EPS, EPMMA or STMMA plastic sheeting.
In step 7), the pumpdown time is 6 minutes.
the usefulness of technique scheme is:
The invention provides a kind of preparation technology of evaporative pattern, all carry out operation under the effect vacuumized in step 6) and step 7), stop after vacuumizing certain hour in step 7) vacuumizing, internal heat by heat transfer to external diffusion, namely a crash handling can be carried out to foundry goods, the residual stress in foundry goods can be eliminated, strengthen the mechanical performance of foundry goods; And utilizing preparation technology of the present invention can enhance productivity more than 35%, casting qualified rate reaches 98.7%, and product quality meets concerned countries standard, compared to existing technology, promotes Be very effective, and can find through inspection, casting quality significant increase.
Detailed description of the invention
embodiment 1
A preparation technology for evaporative pattern, comprises the following steps:
1) production Foam Pattern or running gate system in forming machine;
2) by bonding to apperance and running channel become mould bundle module;
3) use coating machine to carry out leaching to mould bundle module and hang water based paint;
4) dry coating, carry out drying in drying chamber air draft;
5) mould bundle module is put into sandbox, insert dry sand;
6) casting forming under suction function;
7) after casting, with continue to vacuumize several minutes under the identical negative pressure of step 6) and harden to cast(ing) surface after, fully cool;
8), after foundry goods cooling, take out and carry out knockout and the cleaning of excision casting head of casting;
Wherein:
1/13 of the minimum wall thickness (MINI W.) of the particle diameter≤foundry goods of the material bead that Foam Pattern described in step 1) is selected, density is 28kg/m3.
In step 1), Foam Pattern adopts following technique:
1. use air compressor by steam pre-foaming, raw material is sent out in advance;
2. the bead through prefoam is placed on drying, the feed bin of ventilation carries out slaking, and the curing time is 59 hours;
3. the material bead after step 2. slaking is placed in the environment of 70 DEG C, dries 1.4h;
4. metal foaming mould production Foam Pattern or running gate system is used.
In step 1), described Foam Pattern raw material is EPS, EPMMA or STMMA plastic sheeting.
In step 7), the pumpdown time is 6 minutes.
embodiment 2
The preparation technology of a kind of evaporative pattern as described in Example 1, wherein:
1/14 of the minimum wall thickness (MINI W.) of the particle diameter≤foundry goods of the material bead that described Foam Pattern is selected, density is 26kg/m3.
Foam Pattern adopts following technique:
1. use air compressor by steam pre-foaming, raw material is sent out in advance;
2. the bead through prefoam is placed on drying, the feed bin of ventilation carries out slaking, and the curing time is 55 hours;
3. the material bead after step 2. slaking is placed in the environment of 73 DEG C, dries 1.7h;
4. metal foaming mould production Foam Pattern or running gate system is used.
In step 7), the pumpdown time is 7 minutes.
embodiment 3
The preparation technology of a kind of evaporative pattern as described in Example 1, wherein:
1/13 of the minimum wall thickness (MINI W.) of the particle diameter≤foundry goods of the material bead that described Foam Pattern is selected, density is 24kg/m3.
Foam Pattern adopts following technique:
1. use air compressor by steam pre-foaming, raw material is sent out in advance;
2. the bead through prefoam is placed on drying, the feed bin of ventilation carries out slaking, and the curing time is 68 hours;
3. the material bead after step 2. slaking is placed in the environment of 73 DEG C, dries 2h;
4. metal foaming mould production Foam Pattern or running gate system is used.
In step 7), the pumpdown time is 5 minutes.
embodiment 4
The preparation technology of a kind of evaporative pattern as described in Example 1, wherein:
1/12 of the minimum wall thickness (MINI W.) of the particle diameter≤foundry goods of the material bead that described Foam Pattern is selected, density is 30kg/m3.
Foam Pattern adopts following technique:
1. use air compressor by steam pre-foaming, raw material is sent out in advance;
2. the bead through prefoam is placed on drying, the feed bin of ventilation carries out slaking, and the curing time is 55 hours;
3. the material bead after step 2. slaking is placed in the environment of 75 DEG C, dries 1h;
4. metal foaming mould production Foam Pattern or running gate system is used.
In step 7), the pumpdown time is 8 minutes.
The difference of the present invention and traditional handicraft:
The preparation technology of a kind of evaporative pattern provided by the present invention, that is: first particle diameter be≤minimum wall thickness (MINI W.) of foundry goods 1/12 ~ 1/14, density is that the material bead of 24 ~ 30kg/m3 uses air compressor by steam pre-foaming, raw material is sent out in advance, then the bead through prefoam is placed on drying, the feed bin of ventilation carries out slaking, curing time is 50 ~ 68 hours, material bead again after slaking is placed in the environment of 68 ~ 75 DEG C, dry 1 ~ 2h, namely by metal foaming mould production Foam Pattern or running gate system, then by by bonding to apperance and running channel become mould bundle module, re-use coating machine and leaching extension water based paint is carried out to mould bundle module, then carry out drying in drying chamber air draft, dried mould bundle module is put into sandbox, insert dry sand, casting forming under suction function, after casting, after making cast(ing) surface harden again under negative-pressure vacuum state, and fully cool, finally take out and carry out knockout and the cleaning of excision casting head of casting, form finished product cast, not only can enhance productivity more than 35%, casting qualified rate reaches 98.7%, casting of appearance of cast profile cleans, fillet size is correct, and transitions smooth is attractive in appearance, surface inclusion reaches 1 grade, and can find through inspection, casting quality significant increase.
properties of product are tested:
test one:finished product cast heat resistance is measured.
test material:through the foundry goods obtained by technical scheme of the present invention, the application number foundry goods obtained by 201410700342.4 and the foundry goods obtained by traditional lost foam process.
test method:the present invention performs national standard GB/T 26658-2011, tests sample according to GB/T9437-88 regulation.
Sample comprises: choose through 4 products obtained by the same heat of the present invention, chooses through 4 products of application number obtained by 201410700342.4 same heats, chooses through 4 products obtained by the same heat of traditional handicraft.
Above, amount to 12 kinds of samples, result of the test is averaged, and result of the test is as follows.
For trade mark RTCr, standard-required:
Its minimum tensile strength σ b answers >=200N/mm2, and at service temperatures, the average oxidation speed of weight increment < 0.5g/ ㎡ h of foundry goods, growth rate < 0.2%.
result of the test:
1, through the foundry goods obtained by technical scheme of the present invention:
Through test, its minimum tensile strength σ b >=400N/mm2, at service temperatures, the average oxidation speed of weight increment < 0.05g/ ㎡ h of foundry goods, growth rate < 0.04%.
2, through the foundry goods of application number obtained by 201410700342.4:
Through test, its minimum tensile strength σ b >=250N/mm2, at service temperatures, the average oxidation speed of weight increment < 0.15g/ ㎡ h of foundry goods, growth rate < 0.1%.
3, through the foundry goods obtained by traditional lost foam process:
Through test, its minimum tensile strength σ b >=220N/mm2, at service temperatures, the average oxidation speed of weight increment < 0.32g/ ㎡ h of foundry goods, growth rate < 0.18%.
conclusion (of pressure testing):
Can find out by testing a result of the test, through preparation technology of the present invention namely first particle diameter be≤minimum wall thickness (MINI W.) of foundry goods 1/12 ~ 1/14, density is that the material bead of 24 ~ 30kg/m3 uses air compressor by steam pre-foaming, raw material is sent out in advance, then the bead through prefoam is placed on drying, the feed bin of ventilation carries out slaking, curing time is 50 ~ 68 hours, material bead again after slaking is placed in the environment of 68 ~ 75 DEG C, dry 1 ~ 2h, namely by metal foaming mould production Foam Pattern or running gate system; Then by by bonding to apperance and running channel become mould bundle module, re-use coating machine and leaching extension water based paint is carried out to mould bundle module, then carry out drying in drying chamber air draft, dried mould bundle module is put into sandbox, insert dry sand, casting forming under suction function, after casting, after making cast(ing) surface harden again under negative-pressure vacuum state, and fully cool, finally take out and carry out knockout and the cleaning of excision casting head of casting, obtained finished product cast, its heat resistance promotes significantly compared to existing technology.
test two:finished product cast chemical property is measured.
test material:through above-mentioned four embodiments of the present invention technical scheme obtained by aluminium alloy castings, the aluminium alloy castings of application number obtained by 201410700342.4.
test method:the present invention performs national standard GB/T 26658-2011, tests sample according to GB/T1173-1995 regulation.
Sample comprises: choose through 4 products obtained by the same heat of each embodiment of the present invention, chooses through 4 products of application number obtained by 201410700342.4 same heats.
Above, amount to 20 kinds of samples, result of the test is averaged, and result of the test is chosen impurity content and represented, as follows.
For trade mark ZAlSiMg, standard-required:
result of the test:
1, through the embodiment of the present invention 1 technical scheme obtained by aluminium alloy castings:
2, through the embodiment of the present invention 2 technical scheme obtained by aluminium alloy castings:
3, through the embodiment of the present invention 3 technical scheme obtained by aluminium alloy castings:
4, through the embodiment of the present invention 4 technical scheme obtained by aluminium alloy castings:
5, through the application number aluminium alloy castings that to be 201410700342.4 provide obtained by technique:
conclusion (of pressure testing):
Can find out by testing two result of the tests, through preparation technology of the present invention namely first particle diameter be≤minimum wall thickness (MINI W.) of foundry goods 1/12 ~ 1/14, density is that the material bead of 24 ~ 30kg/m3 uses air compressor by steam pre-foaming, raw material is sent out in advance, then the bead through prefoam is placed on drying, the feed bin of ventilation carries out slaking, curing time is 50 ~ 68 hours, material bead again after slaking is placed in the environment of 68 ~ 75 DEG C, dry 1 ~ 2h, namely by metal foaming mould production Foam Pattern or running gate system, then by by bonding to apperance and running channel become mould bundle module, re-use coating machine and leaching extension water based paint is carried out to mould bundle module, then carry out drying in drying chamber air draft, dried mould bundle module is put into sandbox, insert dry sand, casting forming under suction function, after casting, after making cast(ing) surface harden again under negative-pressure vacuum state, and fully cool, finally take out and carry out knockout and the cleaning of excision casting head of casting, obtained finished product cast, impurity content in it meets national standard, and compared to existing technology, effect promoting is obvious, wherein best with the casting quality that the technique described in embodiment 1 is obtained.
Claims (6)
1. a preparation technology for evaporative pattern, is characterized in that: comprise the following steps:
1) production Foam Pattern or running gate system in forming machine;
2) by bonding to apperance and running channel become mould bundle module;
3) use coating machine to carry out leaching to mould bundle module and hang water based paint;
4) dry coating, carry out drying in drying chamber air draft;
5) mould bundle module is put into sandbox, insert dry sand;
6) casting forming under suction function;
7) after casting, with continue to vacuumize 5-8 minute under the identical negative pressure of step 6) and harden to cast(ing) surface after, fully cool;
8), after foundry goods cooling, take out and carry out knockout and the cleaning of excision casting head of casting;
Wherein, 1/12 ~ 1/14 of the minimum wall thickness (MINI W.) of the particle diameter≤foundry goods of the material bead that Foam Pattern described in step 1) is selected, density is 24 ~ 30kg/m3.
2. the preparation technology of a kind of evaporative pattern as claimed in claim 1, is characterized in that: in step 1), Foam Pattern adopts following preparation technology:
1. use air compressor by steam pre-foaming, raw material is sent out in advance;
2. the bead through prefoam is placed on drying, the feed bin of ventilation carries out slaking, and the curing time is 50 ~ 68 hours;
3. the material bead after step 2. slaking is placed in the environment of 68 ~ 75 DEG C, dries 1 ~ 2h;
4. metal foaming mould production Foam Pattern or running gate system is used.
3. the preparation technology of a kind of evaporative pattern as claimed in claim 2, is characterized in that: step 2. in, the curing time is 59 hours.
4. the preparation technology of a kind of evaporative pattern as claimed in claim 2, is characterized in that: step 3. in, the material bead after slaking is placed in the environment of 70 DEG C, dry 1.4h.
5. the preparation technology of a kind of evaporative pattern as claimed in claim 1, is characterized in that: 1/13 of the minimum wall thickness (MINI W.) of the particle diameter≤foundry goods of the material bead that described Foam Pattern is selected, density is 28kg/m3.
6. the preparation technology of a kind of evaporative pattern as claimed in claim 1, is characterized in that: in step 1), and described Foam Pattern raw material is EPS, EPMMA or STMMA plastic sheeting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510445230.3A CN105014012A (en) | 2015-07-27 | 2015-07-27 | Lost foam manufacturing technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510445230.3A CN105014012A (en) | 2015-07-27 | 2015-07-27 | Lost foam manufacturing technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105014012A true CN105014012A (en) | 2015-11-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510445230.3A Pending CN105014012A (en) | 2015-07-27 | 2015-07-27 | Lost foam manufacturing technology |
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| CN (1) | CN105014012A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105499504A (en) * | 2015-12-29 | 2016-04-20 | 马鞍山市三峰机械制造有限公司 | Lost foam casting technology for scraping knife or side blade or middle blade wear-resistant parts |
| CN106734879A (en) * | 2016-12-12 | 2017-05-31 | 重庆理工大学 | A kind of lost foam casting moulding process of waste incineration reciprocating grate bar |
| CN109909449A (en) * | 2019-04-19 | 2019-06-21 | 陈忠响 | A kind of disappearance mould production method of cylinder sleeve of engine |
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| CN104190868A (en) * | 2014-09-25 | 2014-12-10 | 无锡康柏斯机械科技有限公司 | Lost foam casting process |
| CN104439075A (en) * | 2014-11-28 | 2015-03-25 | 柳州市正龙机械制造有限公司 | Evanescent mode casting technology |
| CN104690228A (en) * | 2013-12-07 | 2015-06-10 | 青岛大运机械有限公司 | Lost foam casting method with compact filling of dry sand |
| JP2015116588A (en) * | 2013-12-18 | 2015-06-25 | 株式会社東京ロストワックス工業 | Precision casting method, and molten metal manufacturing apparatus for precision casting |
| CN104741533A (en) * | 2013-12-27 | 2015-07-01 | 博爱县天一铸件厂 | Production method of casting |
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2015
- 2015-07-27 CN CN201510445230.3A patent/CN105014012A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104690228A (en) * | 2013-12-07 | 2015-06-10 | 青岛大运机械有限公司 | Lost foam casting method with compact filling of dry sand |
| JP2015116588A (en) * | 2013-12-18 | 2015-06-25 | 株式会社東京ロストワックス工業 | Precision casting method, and molten metal manufacturing apparatus for precision casting |
| CN104741533A (en) * | 2013-12-27 | 2015-07-01 | 博爱县天一铸件厂 | Production method of casting |
| CN104190868A (en) * | 2014-09-25 | 2014-12-10 | 无锡康柏斯机械科技有限公司 | Lost foam casting process |
| CN104439075A (en) * | 2014-11-28 | 2015-03-25 | 柳州市正龙机械制造有限公司 | Evanescent mode casting technology |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105499504A (en) * | 2015-12-29 | 2016-04-20 | 马鞍山市三峰机械制造有限公司 | Lost foam casting technology for scraping knife or side blade or middle blade wear-resistant parts |
| CN107096887A (en) * | 2015-12-29 | 2017-08-29 | 马鞍山市三峰机械制造有限公司 | A kind of method that lost foam process casts Leaf wearing piece |
| CN106734879A (en) * | 2016-12-12 | 2017-05-31 | 重庆理工大学 | A kind of lost foam casting moulding process of waste incineration reciprocating grate bar |
| CN106734879B (en) * | 2016-12-12 | 2018-12-04 | 重庆理工大学 | A kind of lost foam casting moulding process of waste incineration reciprocating grate bar |
| CN109909449A (en) * | 2019-04-19 | 2019-06-21 | 陈忠响 | A kind of disappearance mould production method of cylinder sleeve of engine |
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