CN105522111A - Manufacturing method for ventilation type shell - Google Patents
Manufacturing method for ventilation type shell Download PDFInfo
- Publication number
- CN105522111A CN105522111A CN201511007799.8A CN201511007799A CN105522111A CN 105522111 A CN105522111 A CN 105522111A CN 201511007799 A CN201511007799 A CN 201511007799A CN 105522111 A CN105522111 A CN 105522111A
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- Prior art keywords
- sand
- transition
- granularity
- manufacturing
- branch fiber
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/20—Stack moulds, i.e. arrangement of multiple moulds or flasks
Abstract
The invention discloses a manufacturing method for a ventilation type shell. The manufacturing method includes the steps of pattern manufacturing, surface layer coating manufacturing, facing sand coating, transition layer coating manufacturing, transition sand coating, roasting and the like. According to the manufacturing method, rice shells and scraps and crop straw fibers serve as shell manufacturing materials, the using number of refractory matter is decreased, and environmental protection is facilitated; the reasonable proportion is adopted, and the ventilation performance is improved on the premise that the strength of the shell is guaranteed; and cellular material kieselguhr is adopted, exhausting is facilitated, the defect of air holes of castings is reduced, the rate of finished products is increased, and meanwhile the weight of the shell is reduced.
Description
Technical field
The invention belongs to casting technology field, especially relate to a kind of preparation method of ventilative shell.
Background technology
Mould hot investment casting is the casting forming process of a kind of advanced person, be used for realizing complexity, thin-walled, precision casting is shaped, at accurate jewellery, aero-engine and other precise forming part aspects have huge advantage, traditional investment precision casting technology makes meltability model (abbreviation fusible pattern) with meltable material (as wax material), apply the fireproof coating that some layers are special thereon, through super-dry and sclerosis formation overall module, melt from module again and lose fusible pattern thus the formwork obtaining hollow, then formwork is carried out high temperature sintering, last pour into a mould melting wherein metal and the method for foundry goods that obtains.At present in the production process of precision-investment casting, multiplex ceramic sand, the formwork smashed after casting terminates also exists molding sand and reclaims difficulty, problem big for environment pollution, the production cost of wax-pattern is high simultaneously, therefore, find a kind of low price, high-performance, environmental protection formwork preparation method be necessary very much.
Summary of the invention
Based on above technical problem, the invention discloses a kind of preparation method of ventilative shell, can obtain efficiently casting formwork, and adopt environment-friendly materials, protect environment and re-sources.
The technical scheme that the present invention is complete comprises:
A preparation method for ventilative shell, is characterized in that, comprises the steps:
(1) apperance group is prepared, adopt polystyrene to obtain white mould, running gate system, the rising head identical with cast shape through foaming, adopt the mode of six to eight mould (namely a set of running gate system joins six to eight foundry goods) to be bonded to apperance group subsequently;
(2) investment precoat preparation, the thin schmigel of 320 order, waterglass, 240 order rice hulls bits, defoamer, cobalt aluminate mix and blend are obtained investment precoat, the weight proportion of investment precoat component is: thin schmigel: waterglass: rice hulls is considered to be worth doing: defoamer: cobalt aluminate=(1800-2000): (140-160): (100-200): (1-2): (2-5), and described defoamer is n-butanol;
(3) vermicelli sand: described apperance group is immersed in investment precoat pond, takes out subsequently, make it apply evenly to its surface blowing in rotating condition, described blow-time is 30s-60s; Facing sand is spilt by rainforest formula stucco mode to its surface subsequently under multi-axis turning condition, described facing sand component is aluminum oxide sand and rice hulls bits, weight proportion is aluminum oxide sand: rice hulls bits=(10-15): 1, the granularity of aluminum oxide sand is 80-100 order, and rice hulls bits granularity is 160-200 order; By being coated with, the apperance group hanging up properly facing sand is dry;
(4) transition zone coating preparation, diatomite in powder, zircon sand powder, crop branch fiber, silicate hydrolyzate liquid mix and blend are obtained transition zone coating, described diatomite in powder granularity is 240 orders, zircon sand granularity is 240 orders, crop branch fiber diameter is 2-3mm, silicate hydrolyzate liquid dioxide-containing silica is 20%, and the weight proportion of transition zone coating composition is: diatomite in powder: zircon sand powder: crop branch fiber: silicate hydrolyzate liquid=(350-500): (1800-2000): (50-120): (2-4);
(5) transition sand is hung, apperance group dried in step (3) is immersed in transition zone coating pond, take out subsequently, it is made to apply evenly to its surface blowing in rotating condition, described blow-time is 40s-80s, transition sand is spilt by rainforest formula stucco mode to its surface subsequently under multi-axis turning condition, described transition sand component is zircon sand meal and crop branch fiber, weight proportion is zircon sand meal: crop branch fiber=(10-15): 1, the granularity of zircon sand meal is 40-60 order, and crop branch fiber diameter is 4-6mm; By the dry 12-18h of apperance group being coated with transition sand;
(6) step (4) and step (5) is repeated, until formwork thickness reaches 8-10mm, dry after slurry seal.
(7) the dried formwork of step (6) slurry seal is carried out roasting, obtain ventilative shell.
Hinge structure of the present invention, adopts polystyrene as apperance, reduces cost, adopt rice hulls bits, crop branch fiber as shell material processed, reduce the use amount of refractory material, be both conducive to environmental protection, and adopt rational proportioning, under the prerequisite ensureing investment shell intensity, add gas permeability, the diatomite in transition zone coating is porous material, is conducive to exhaust, reduce bleb defect, add yield rate, make formwork reduce weight, and raw material is easy to get simultaneously.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention will be further described.
Embodiment 1:
A preparation method for ventilative shell, is characterized in that, comprises the steps:
(1) prepare apperance, preparation apperance group, adopts polystyrene to obtain apperance, running gate system, the rising head identical with cast shape through foaming, and is bonded to apperance group, adopt six moulds;
(2) investment precoat preparation, adopt waterglass as binding agent, thin schmigel, waterglass, rice hulls bits, defoamer, cobalt aluminate mix and blend are obtained investment precoat, described thin schmigel granularity is 300 orders, rice hulls bits granularity is 240 orders, and the weight proportion of above-mentioned coating component is: thin schmigel: waterglass: rice hulls is considered to be worth doing: defoamer: cobalt aluminate=1800:140:100:1:2;
(3) vermicelli sand: described apperance group is immersed in investment precoat pond, takes out subsequently, make it apply evenly to its surface blowing in rotating condition, described blow-time is 30s; Spill facing sand to its surface in rotating condition subsequently, described facing sand is facing sand component is aluminum oxide sand and rice hulls bits, and weight proportion is aluminum oxide sand: rice hulls bits=10:1, and the granularity of aluminum oxide sand is 80 orders, and rice hulls bits granularity is 160 orders; The dry 12h of the apperance group hanging up properly facing sand will be coated with;
(4) transition zone coating preparation, diatomite in powder, zircon sand powder, crop branch fiber, silicate hydrolyzate liquid mix and blend are obtained transition zone coating, described diatomite in powder granularity is 240 orders, zircon sand granularity is 240 orders, crop branch fiber diameter is 2-3mm, silicate hydrolyzate liquid dioxide-containing silica is 20%, and the weight proportion of above-mentioned coating component is: diatomite in powder: zircon sand powder: crop branch fiber: silicate hydrolyzate liquid=350:1800:50:2;
(5) hang transition sand, apperance group dried in step (3) immersed in transition zone coating pond, take out subsequently, make it apply evenly to its surface blowing in rotating condition, described blow-time is 40s-80s; Transition sand is spilt in rotating condition subsequently to its surface, described transition sand component is zircon sand meal and crop branch fiber, weight proportion is zircon sand meal: crop branch fiber=10:1, and the granularity of zircon sand meal is 40 orders, and crop branch fiber diameter is 4mm; By the dry 12h of apperance group being coated with transition sand;
(6) step (4) and step (5) 2-4 time is repeated, until formwork thickness reaches 6mm, drying after slurry seal;
(7) the dried formwork of step (6) slurry seal is carried out roasting, obtain ventilative shell.
Embodiment 2:
A preparation method for ventilative shell, is characterized in that, comprises the steps:
(1) prepare apperance, preparation apperance group, adopts polystyrene to obtain apperance, running gate system, the rising head identical with cast shape through foaming, and is bonded to apperance group, adopt eight moulds;
(2) investment precoat preparation, adopt waterglass as binding agent, thin schmigel, waterglass, rice hulls bits, defoamer, cobalt aluminate mix and blend are obtained investment precoat, described thin schmigel granularity is 300 orders, rice hulls bits granularity is 240 orders, and the weight proportion of above-mentioned coating component is: thin schmigel: waterglass: rice hulls is considered to be worth doing: defoamer: cobalt aluminate=2000:160:200:2:5;
(3) vermicelli sand: described apperance group is immersed in investment precoat pond, takes out subsequently, make it apply evenly to its surface blowing in rotating condition, described blow-time is 60s; Spill facing sand to its surface in rotating condition subsequently, described facing sand is facing sand component is aluminum oxide sand and rice hulls bits, and weight proportion is aluminum oxide sand: rice hulls bits=15:1, and the granularity of aluminum oxide sand is 100 orders, and rice hulls bits granularity is 200 orders; The dry 18h of the apperance group hanging up properly facing sand will be coated with;
(4) transition zone coating preparation, diatomite in powder, zircon sand powder, crop branch fiber, silicate hydrolyzate liquid mix and blend are obtained transition zone coating, described diatomite in powder granularity is 240 orders, zircon sand granularity is 240 orders, crop branch fiber diameter is 3mm, silicate hydrolyzate liquid dioxide-containing silica is 20%, and the weight proportion of above-mentioned coating component is: diatomite in powder: zircon sand powder: crop branch fiber: silicate hydrolyzate liquid=500:2000:120:4;
(5) hang transition sand, apperance group dried in step (3) immersed in transition zone coating pond, take out subsequently, make it apply evenly to its surface blowing in rotating condition, described blow-time is 80s; Transition sand is spilt in rotating condition subsequently to its surface, described transition sand component is zircon sand meal and crop branch fiber, weight proportion is zircon sand meal: crop branch fiber=15:1, and the granularity of zircon sand meal is 60 orders, and crop branch fiber diameter is 6mm; By the dry 18h of apperance group being coated with transition sand;
(6) step (4) and step (5) 2-4 time is repeated, until formwork thickness reaches 10mm, drying after slurry seal;
(7) the dried formwork of step (6) slurry seal is carried out roasting, obtain ventilative shell.
Claims (1)
1. a preparation method for ventilative shell, is characterized in that, comprises the steps:
(1) apperance group is prepared, adopt polystyrene to obtain white mould, running gate system, the rising head identical with cast shape through foaming, adopt the mode of six to eight mould (namely a set of running gate system joins six to eight foundry goods) to be bonded to apperance group subsequently;
(2) investment precoat preparation, the thin schmigel of 320 order, waterglass, 240 order rice hulls bits, defoamer, cobalt aluminate mix and blend are obtained investment precoat, the weight proportion of investment precoat component is: thin schmigel: waterglass: rice hulls is considered to be worth doing: defoamer: cobalt aluminate=(1800-2000): (140-160): (100-200): (1-2): (2-5), and described defoamer is n-butanol;
(3) vermicelli sand: described apperance group is immersed in investment precoat pond, takes out subsequently, make it apply evenly to its surface blowing in rotating condition, described blow-time is 30s-60s; Facing sand is spilt by rainforest formula stucco mode to its surface subsequently under multi-axis turning condition, described facing sand component is aluminum oxide sand and rice hulls bits, weight proportion is aluminum oxide sand: rice hulls bits=(10-15): 1, the granularity of aluminum oxide sand is 80-100 order, and rice hulls bits granularity is 160-200 order; By being coated with, the apperance group hanging up properly facing sand is dry;
(4) transition zone coating preparation, diatomite in powder, zircon sand powder, crop branch fiber, silicate hydrolyzate liquid mix and blend are obtained transition zone coating, described diatomite in powder granularity is 240 orders, zircon sand granularity is 240 orders, crop branch fiber diameter is 2-3mm, silicate hydrolyzate liquid dioxide-containing silica is 20%, and the weight proportion of transition zone coating composition is: diatomite in powder: zircon sand powder: crop branch fiber: silicate hydrolyzate liquid=(350-500): (1800-2000): (50-120): (2-4);
(5) transition sand is hung, apperance group dried in step (3) is immersed in transition zone coating pond, take out subsequently, it is made to apply evenly to its surface blowing in rotating condition, described blow-time is 40s-80s, transition sand is spilt by rainforest formula stucco mode to its surface subsequently under multi-axis turning condition, described transition sand component is zircon sand meal and crop branch fiber, weight proportion is zircon sand meal: crop branch fiber=(10-15): 1, the granularity of zircon sand meal is 40-60 order, and crop branch fiber diameter is 4-6mm; By the dry 12-18h of apperance group being coated with transition sand;
(6) step (4) and step (5) is repeated, until formwork thickness reaches 8-10mm, dry after slurry seal.
(7) the dried formwork of step (6) slurry seal is carried out roasting, obtain ventilative shell.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511007799.8A CN105522111A (en) | 2015-12-29 | 2015-12-29 | Manufacturing method for ventilation type shell |
| PCT/CN2016/107870 WO2017114071A1 (en) | 2015-12-29 | 2016-11-30 | Method for preparing breathable moulding shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511007799.8A CN105522111A (en) | 2015-12-29 | 2015-12-29 | Manufacturing method for ventilation type shell |
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| CN105522111A true CN105522111A (en) | 2016-04-27 |
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| CN201511007799.8A Pending CN105522111A (en) | 2015-12-29 | 2015-12-29 | Manufacturing method for ventilation type shell |
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| WO (1) | WO2017114071A1 (en) |
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| WO2017114078A1 (en) * | 2015-12-30 | 2017-07-06 | 张建勋 | Method for preparing engine component |
| WO2017114064A1 (en) * | 2015-12-29 | 2017-07-06 | 张建勋 | Method for preparing environmentally friendly fine casting mould shell |
| WO2017114079A1 (en) * | 2015-12-30 | 2017-07-06 | 张建勋 | Method for preparing automobile supercharging turbine |
| WO2017114068A1 (en) * | 2015-12-29 | 2017-07-06 | 张建勋 | Environmentally friendly method for preparing automobile engine blade |
| WO2017114066A1 (en) * | 2015-12-29 | 2017-07-06 | 张建勋 | Environmentally friendly method for preparing automobile engine shell |
| WO2017114071A1 (en) * | 2015-12-29 | 2017-07-06 | 张建勋 | Method for preparing breathable moulding shell |
| WO2017114081A1 (en) * | 2015-12-30 | 2017-07-06 | 张建勋 | Lost foam casting method for diesel engine shell |
| WO2017114065A1 (en) * | 2015-12-29 | 2017-07-06 | 张建勋 | Method for preparing environmentally friendly casting material |
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| WO2017114068A1 (en) * | 2015-12-29 | 2017-07-06 | 张建勋 | Environmentally friendly method for preparing automobile engine blade |
| WO2017114066A1 (en) * | 2015-12-29 | 2017-07-06 | 张建勋 | Environmentally friendly method for preparing automobile engine shell |
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Application publication date: 20160427 |