CN101391285A - Use method of high-temperature rock-wool core-making technique in stainless steel precision castings - Google Patents
Use method of high-temperature rock-wool core-making technique in stainless steel precision castings Download PDFInfo
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- CN101391285A CN101391285A CNA2008102307343A CN200810230734A CN101391285A CN 101391285 A CN101391285 A CN 101391285A CN A2008102307343 A CNA2008102307343 A CN A2008102307343A CN 200810230734 A CN200810230734 A CN 200810230734A CN 101391285 A CN101391285 A CN 101391285A
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Abstract
The invention relates to an application process of a high temperature rock wool core-making technique in stainless steel precision castings, which can effectively solve the problems that complex inner cavities of fusible patterns need to be coated, and the cleaning is difficult, mass air holes are produced in the castings, the rate of finished products is low and the batch production is unavailable, and the process adopts the technical proposal that a high temperature rock wool core comprises, in weight percentage: high temperature rock wool: 65 percent to 75 percent, quartz sand or moying sand: 8 percent to 12 percent, zirconium powder or quartz powder: 10 percent to 14 percent, and silica sol or water glass: 7 percent to 9 percent, a total of 100 percent, firstly, the high temperature rock wool is crushed, then the quartz sand or moying sand, the zirconium powder or quartz powder and the silica sol or water glass are added into the crushed rock wool and are mixed and agitated for 15 to 25 minutes to form a core material for backup, then the following steps are carried out: 1. a core-making die is cleaned up, and the core material is filled into the core-making die to be pressed into the high temperature rock wool core; 2. the surface of the high temperature rock wool core is processed; and 3. the high temperature rock wool patternmaking is implemented; and the invention reduces the production cost and labor intensity, and has great economic and social benefit.
Description
One, technical field
The present invention relates to the model casting field, the application process of particularly a kind of high-temperature rock-wool core-making technique in stainless steel precision castings.
Two, background technology
Continuous development along with model casting, both at home and abroad on the structure of stainless cast steel part especially irregular holes such as deep hole, curved hole, aperture brought very big because of difficulty to casting, many smart products that producer can not produce the difficulty complexity in enormous quantities of casting, yield rate can't improve, and has caused a large amount of wastes to production cost.Urea core and ceramic core are often adopted in model casting, and this is because core cavity is complex-shaped, factors such as demoulding difficulty, die mould manufacturing expense height behind the pressure wax.But urea core and ceramic core also have shortcoming: after the dissolving of urea core, urea can not reclaim, and directly discharging is unfavorable for environmental protection; The complicated inner cavity of fusible pattern is still wanted coating, and the castability of deep hole, curved hole, aperture, special-shaped inner chamber still can not get solving.Ceramic core in casting through behind the high temperature sintering, the ceramic core hardening, unusual difficulty in scale removal process must be by boring and pickling can be cleared up, foundry goods is inner can a large amount of pores of generation, yield rate is very low, can't produce in batches.
Three, summary of the invention
At above-mentioned situation, for overcoming the defective of prior art, purpose of the present invention just provides the application process of a kind of high-temperature rock-wool core-making technique in stainless steel precision castings, the complicated inner cavity that can effectively solve fusible pattern is wanted coating, the cleaning difficulty, the a large amount of pores of the inner generation of foundry goods, yield rate is low, the problem that can't produce in batches, the technical scheme of its solution is, the high-temperature rock-wool core is by by weight percentage: high-temperature rock-wool 65%～75%, quartz sand or English sand 8%～12% not, zirconium powder or silica flour 10%～14%, Ludox or waterglass 7%～9%, total amount is 100% to make, at first with high-temperature rock-wool powder essence, the order number reaches the 20-30 order, add quartz sand or Mo Yingsha then, zirconium powder or silica flour, Ludox or waterglass, mix and stirred 15～25 minutes, make core material even, loose, do not have the caking back and become core material standby, carry out according to the following steps again:
1, die for making core is cleaned out, core material is packed into is pressed into the high-temperature rock-wool core through pressure 4～5.5MPa in the die for making core;
2, the high-temperature rock-wool whose surfaces is handled, method is:
Prepare a high-pressure spray gun in advance, it is the 15-20 zirconium English powder slurry of second by flow cup that viscosity is housed in the spray gun, and it is stand-by that spray gun is connected compressed air; Said 15-20 is meant by using flow cup to control coating powder liquor ratio and viscosity second, because dope viscosity is comparatively responsive to the minor variations of powder liquor ratio, viscosity can reflect the flowability of coating simultaneously, they are methods of control coating property, the domestic flow cup capacity that uses is 100mL, the standard flow cup of tap hole ∮ 6mm ± 0.2mm;
The high-temperature rock-wool core that makes is sprayed the zirconium English powder slurry of 0.5mm, make whose surfaces produce the refractory material (can bear 1600 ℃ of high temperature) of a kind of high temperature, gloss, then the core that makes is positioned over thermostatic chamber inner drying 8～12h;
3, high-temperature rock-wool molding
To put into die cavity exactly through the high-temperature rock-wool core of super-dry, by FYY5 (8)-2 double horizontal hydraulic wax mold die casting machine the cured liquid of good heat insulation is injected die cavity, make the cured mould that has core, after the product examine finishing, with La Mozushu, process for making shell is sent in product examine once more, by coating, stucco, dry, the cured mould that will assemble exactly coated is inserted in the surface layer slurry bucket and is stained with slurry, stucco be will be stained with slurry cured mould in drenching the sand machine evenly on sand, the cured mould that to go up sand again is 22 ℃ of room temperatures, the hothouse inner drying of humidity 60% so repeats to obtain more than five times or five times the multilayer shell of desired thickness; Shell makes it near molten steel temperature through 1160 ℃ roasting, to pour in the shell by the molten steel of energy-conservation quick intermediate frequency furnace refining of JPS type and batching, after waiting to pile part cooling formation, the high-temperature rock-wool core of piece surface shell and part inside is come off naturally by vibrations.
Said high-temperature rock-wool is a rock wool material of new generation, adopt the natural rock of high-quality, the inorganic fibre material of making through high temperature melting, fibrillatable has stronger heat-insulating property, fire resistance, its heat resisting temperature can reach 1800 ℃, has characteristics such as good flame resistance, plasticity be good.
The present invention is used for part endoporus complexity, bigger production in batches with the high-temperature rock-wool core, can make the finished product rate be increased to 90%, reduce production costs and labor strength, simplify operational procedure, reduce environmental pollution, have huge economic and social benefit.
Four, the specific embodiment
Embodiment 1
The high-temperature rock-wool core is by by weight percentage: high-temperature rock-wool 70%, quartz sand 10%, zirconium powder 12%, Ludox 8% is made, and at first high-temperature rock-wool is become the powder shape with pulverizer powder essence, and the order number reaches the 20-30 order, add quartz sand, zirconium powder, Ludox then, mix to stir 20 minutes, make core material even, loose, do not have that to make core material behind the caking standby, carry out according to the following steps again:
1, die for making core is cleaned out, core material is packed in the die for making core, mould adopts the 45# steel to do, and core making machine can adopt the 25KN hydraulic press, and equipment pressure is set at 4-5.5MPa, is pressed into the high-temperature rock-wool core;
2, the high-temperature rock-wool whose surfaces is handled, method is:
Prepare a high-pressure spray gun in advance, it is the 15-20 zirconium English powder slurry of second by flow cup that viscosity is housed in the spray gun, and it is stand-by that spray gun is connected compressed air,
The high-temperature rock-wool core that makes is sprayed the zirconium English powder slurry of 0.5mm, make whose surfaces produce the refractory material (can bear 1600 ℃ of high temperature) of a kind of high temperature, gloss, then the core that makes is positioned over thermostatic chamber inner drying 8～12h;
3, high-temperature rock-wool molding
To put into die cavity exactly through the high-temperature rock-wool core of super-dry, by FYY5 (8)-2 double horizontal hydraulic wax mold die casting machine the cured liquid of good heat insulation is injected die cavity, make the cured mould that has core, after the product examine finishing, with La Mozushu, process for making shell is sent in product examine once more, by coating, stucco, dry, the cured mould that will assemble exactly coated is inserted in the surface layer slurry bucket and is stained with slurry, stucco be will be stained with slurry cured mould in drenching the sand machine evenly on sand, the cured mould that to go up sand again is 22 ℃ of room temperatures, the hothouse inner drying of humidity 60% so repeats to obtain more than five times or five times the multilayer shell of desired thickness; Shell makes it near molten steel temperature through 1160 ℃ roasting, to pour in the shell by the molten steel of energy-conservation quick intermediate frequency furnace refining of JPS type and batching, after waiting to pile part cooling formation, the high-temperature rock-wool core of piece surface shell and part inside is come off naturally by vibrations.
Embodiment 2
The high-temperature rock-wool core also can be by by weight percentage: high-temperature rock-wool 70%, English sand 10%, zirconium powder 12%, waterglass 8% is made, and at first high-temperature rock-wool is become the powder shape with pulverizer powder essence, and the order number reaches the 20-30 order, add quartz sand, zirconium powder, Ludox then, mix to stir 20 minutes, make core material even, loose, do not have that to make core material behind the caking standby, carry out according to the following steps again:
1, die for making core is cleaned out, core material is packed in the die for making core, mould adopts the 45# steel to do, and core making machine can adopt the 25KN hydraulic press, and equipment pressure is set at 4-5.5MPa, is pressed into the high-temperature rock-wool core;
2, the high-temperature rock-wool whose surfaces is handled, method is:
Prepare a high-pressure spray gun in advance, it is the 15-20 zirconium English powder slurry of second by flow cup that viscosity is housed in the spray gun, and it is stand-by that spray gun is connected compressed air,
The high-temperature rock-wool core that makes is sprayed the zirconium English powder slurry of 0.5mm, make whose surfaces produce the refractory material (can bear 1600 ℃ of high temperature) of a kind of high temperature, gloss, then the core that makes is positioned over thermostatic chamber inner drying 8～12h;
3, high-temperature rock-wool molding
To put into die cavity exactly through the high-temperature rock-wool core of super-dry, by FYY5 (8)-2 double horizontal hydraulic wax mold die casting machine the cured liquid of good heat insulation is injected die cavity, make the cured mould that has core, after the product examine finishing, with La Mozushu, process for making shell is sent in product examine once more, by coating, stucco, dry, the cured mould that will assemble exactly coated is inserted in the surface layer slurry bucket and is stained with slurry, stucco be will be stained with slurry cured mould in drenching the sand machine evenly on sand, the cured mould that to go up sand again is 22 ℃ of room temperatures, the hothouse inner drying of humidity 60% so repeats to obtain more than five times or five times the multilayer shell of desired thickness; Shell makes it near molten steel temperature through 1160 ℃ roasting, to pour in the shell by the molten steel of energy-conservation quick intermediate frequency furnace refining of JPS type and batching, after waiting to pile part cooling formation, the high-temperature rock-wool core of piece surface shell and part inside is come off naturally by vibrations.
Embodiment 3
The high-temperature rock-wool core also can be by by weight percentage: high-temperature rock-wool 70%, quartz sand 10%, silica flour 12%, waterglass 8% is made, and at first high-temperature rock-wool is become the powder shape with pulverizer powder essence, and the order number reaches the 20-30 order, add quartz sand, zirconium powder, Ludox then, mix to stir 20 minutes, make core material even, loose, do not have that to make core material behind the caking standby, carry out according to the following steps again:
1, die for making core is cleaned out, core material is packed in the die for making core, mould adopts the 45# steel to do, and core making machine can adopt the 25KN hydraulic press, and equipment pressure is set at 4-5.5MPa, is pressed into the high-temperature rock-wool core;
2, the high-temperature rock-wool whose surfaces is handled, method is:
Prepare a high-pressure spray gun in advance, it is the 15-20 zirconium English powder slurry of second by flow cup that viscosity is housed in the spray gun, and it is stand-by that spray gun is connected compressed air,
The high-temperature rock-wool core that makes is sprayed the zirconium English powder slurry of 0.5mm, make whose surfaces produce the refractory material (can bear 1600 ℃ of high temperature) of a kind of high temperature, gloss, then the core that makes is positioned over thermostatic chamber inner drying 8～12h;
3, high-temperature rock-wool molding
To put into die cavity exactly through the high-temperature rock-wool core of super-dry, by FYY5 (8)-2 double horizontal hydraulic wax mold die casting machine the cured liquid of good heat insulation is injected die cavity, make the cured mould that has core, after the product examine finishing, with La Mozushu, process for making shell is sent in product examine once more, by coating, stucco, dry, the cured mould that will assemble exactly coated is inserted in the surface layer slurry bucket and is stained with slurry, stucco be will be stained with slurry cured mould in drenching the sand machine evenly on sand, the cured mould that to go up sand again is 22 ℃ of room temperatures, the hothouse inner drying of humidity 60% so repeats to obtain more than five times or five times the multilayer shell of desired thickness; Shell makes it near molten steel temperature through 1160 ℃ roasting, to pour in the shell by the molten steel of energy-conservation quick intermediate frequency furnace refining of JPS type and batching, after waiting to pile part cooling formation, the high-temperature rock-wool core of piece surface shell and part inside is come off naturally by vibrations.
Adopt the high temperature core to replace urea core and ceramic core production, have the following advantages: one, the high-temperature rock-wool core has certain gas permeability; Two, when dewaxing, core is stood the intrusion of hot water or steam and not dissolved; Three, during roasting, keep out the high-temperature roasting about 1150 ℃, and under this high temperature, reach more than the 2h continuously; When four, pouring into a mould, when the pouring molten steel about 1630 ℃ impacted, the rock wool core can show good high temperature strength, and core just can be dashed and stride.Not difficult when five, the high-temperature rock-wool core is cleared up, on shake shell machine, shake 8-12S, the overwhelming majority drops totally, and collapsibility is good, if some part leaves the remaining core material of only a few, available blasting method removing in turning, curved hole, narrow gap.
The present invention is used for part endoporus complexity, bigger production in batches with the high-temperature rock-wool core, can make the finished product rate be increased to 90%, reduce production costs and labor strength, simplify operational procedure, reduce environmental pollution, have huge economic and social benefit.
Claims (4)
1, the application process of high-temperature rock-wool core-making technique in stainless steel precision castings, it is characterized in that, the high-temperature rock-wool core is by by weight percentage: high-temperature rock-wool 65%～75%, quartz sand or English sand 8%～12% not, zirconium powder or silica flour 10%～14%, Ludox or waterglass 7%～9%, total amount is 100% to make, at first with high-temperature rock-wool powder essence, the order number reaches the 20-30 order, add quartz sand or Mo Yingsha then, zirconium powder or silica flour, Ludox or waterglass, mix and stirred 15～25 minutes, make core material even, loose, do not have the caking back and become core material standby, carry out according to the following steps again:
(1), die for making core is cleaned out, core material is packed into be pressed into the high-temperature rock-wool core through pressure 4～5.5MPa in the die for making core;
(2), the high-temperature rock-wool whose surfaces is handled, method is:
Prepare a high-pressure spray gun in advance, it is the 15-20 zirconium English powder slurry of second by flow cup that viscosity is housed in the spray gun, and it is stand-by that spray gun is connected compressed air;
The high-temperature rock-wool core that makes is sprayed the zirconium English powder slurry of 0.5mm, make whose surfaces produce the refractory material of a kind of high temperature, gloss, can bear 1600 ℃ of high temperature, then the core that makes is positioned over thermostatic chamber inner drying 8～12h;
(3), high-temperature rock-wool molding
To put into die cavity exactly through the high-temperature rock-wool core of super-dry, by FYY5 (8)-2 double horizontal hydraulic wax mold die casting machine the cured liquid of good heat insulation is injected die cavity, make the cured mould that has core, after the product examine finishing, with La Mozushu, process for making shell is sent in product examine once more, by coating, stucco, dry, the cured mould that will assemble exactly coated is inserted in the surface layer slurry bucket and is stained with slurry, stucco be will be stained with slurry cured mould in drenching the sand machine evenly on sand, the cured mould that to go up sand again is 22 ℃ of room temperatures, the hothouse inner drying of humidity 60% so repeats to obtain more than five times or five times the multilayer shell of desired thickness; Shell makes it near molten steel temperature through 1160 ℃ roasting, to pour in the shell by the molten steel of energy-conservation quick intermediate frequency furnace refining of JPS type and batching, after waiting to pile part cooling formation, the high-temperature rock-wool core of piece surface shell and part inside is come off naturally by vibrations.
2, the application process of high-temperature rock-wool core-making technique according to claim 1 in stainless steel precision castings, it is characterized in that, the high-temperature rock-wool core is by by weight percentage: high-temperature rock-wool 70%, quartz sand 10%, zirconium powder 12%, Ludox 8% is made, at first high-temperature rock-wool is become the powder shape with pulverizer powder essence, the order number reaches the 20-30 order, add quartz sand, zirconium powder, Ludox then, mix to stir 20 minutes, make core material even, loose, do not have that to make core material behind the caking standby, carry out according to the following steps again:
(1), die for making core is cleaned out, core material is packed in the die for making core, mould adopts the 45# steel to do, and core making machine can adopt the 25KN hydraulic press, and equipment pressure is set at 4-5.5MPa, is pressed into the high-temperature rock-wool core;
(2), the high-temperature rock-wool whose surfaces is handled, method is:
Prepare a high-pressure spray gun in advance, it is the 15-20 zirconium English powder slurry of second by flow cup that viscosity is housed in the spray gun, and it is stand-by that spray gun is connected compressed air,
The high-temperature rock-wool core that makes is sprayed the zirconium English powder slurry of 0.5mm, make whose surfaces produce the refractory material of a kind of high temperature, gloss, then the core that makes is positioned over thermostatic chamber inner drying 8～12h;
(3), high-temperature rock-wool molding
To put into die cavity exactly through the high-temperature rock-wool core of super-dry, by FYY5 (8)-2 double horizontal hydraulic wax mold die casting machine the cured liquid of good heat insulation is injected die cavity, make the cured mould that has core, after the product examine finishing, with La Mozushu, process for making shell is sent in product examine once more, by coating, stucco, dry, the cured mould that will assemble exactly coated is inserted in the surface layer slurry bucket and is stained with slurry, stucco be will be stained with slurry cured mould in drenching the sand machine evenly on sand, the cured mould that to go up sand again is 22 ℃ of room temperatures, the hothouse inner drying of humidity 60% so repeats to obtain more than five times or five times the multilayer shell of desired thickness; Shell makes it near molten steel temperature through 1160 ℃ roasting, to pour in the shell by the molten steel of energy-conservation quick intermediate frequency furnace refining of JPS type and batching, after waiting to pile part cooling formation, the high-temperature rock-wool core of piece surface shell and part inside is come off naturally by vibrations.
3, the application process of high-temperature rock-wool core-making technique according to claim 1 in stainless steel precision castings, it is characterized in that, the high-temperature rock-wool core also can be by by weight percentage: high-temperature rock-wool 70%, English sand 10%, zirconium powder 12%, waterglass 8% is made, at first high-temperature rock-wool is become the powder shape with pulverizer powder essence, the order number reaches the 20-30 order, add quartz sand, zirconium powder, Ludox then, mix to stir 20 minutes, make core material even, loose, do not have that to make core material behind the caking standby, carry out according to the following steps again:
(1), die for making core is cleaned out, core material is packed in the die for making core, mould adopts the 45# steel to do, and core making machine can adopt the 25KN hydraulic press, and equipment pressure is set at 4-5.5MPa, is pressed into the high-temperature rock-wool core;
(2), the high-temperature rock-wool whose surfaces is handled, method is:
Prepare a high-pressure spray gun in advance, it is the 15-20 zirconium English powder slurry of second by flow cup that viscosity is housed in the spray gun, and it is stand-by that spray gun is connected compressed air,
The high-temperature rock-wool core that makes is sprayed the zirconium English powder slurry of 0.5mm, make whose surfaces produce the refractory material of a kind of high temperature, gloss, then the core that makes is positioned over thermostatic chamber inner drying 8～12h;
(3), high-temperature rock-wool molding
To put into die cavity exactly through the high-temperature rock-wool core of super-dry, by FYY5 (8)-2 double horizontal hydraulic wax mold die casting machine the cured liquid of good heat insulation is injected die cavity, make the cured mould that has core, after the product examine finishing, with La Mozushu, process for making shell is sent in product examine once more, by coating, stucco, dry, the cured mould that will assemble exactly coated is inserted in the surface layer slurry bucket and is stained with slurry, stucco be will be stained with slurry cured mould in drenching the sand machine evenly on sand, the cured mould that to go up sand again is 22 ℃ of room temperatures, the hothouse inner drying of humidity 60% so repeats to obtain more than five times or five times the multilayer shell of desired thickness; Shell makes it near molten steel temperature through 1160 ℃ roasting, to pour in the shell by the molten steel of energy-conservation quick intermediate frequency furnace refining of JPS type and batching, after waiting to pile part cooling formation, the high-temperature rock-wool core of piece surface shell and part inside is come off naturally by vibrations.
4, the application process of high-temperature rock-wool core-making technique according to claim 1 in stainless steel precision castings, it is characterized in that, the high-temperature rock-wool core also can be by by weight percentage: high-temperature rock-wool 70%, quartz sand 10%, silica flour 12%, waterglass 8% is made, at first high-temperature rock-wool is become the powder shape with pulverizer powder essence, the order number reaches the 20-30 order, add quartz sand, zirconium powder, Ludox then, mix to stir 20 minutes, make core material even, loose, do not have that to make core material behind the caking standby, carry out according to the following steps again:
(1), die for making core is cleaned out, core material is packed in the die for making core, mould adopts the 45# steel to do, and core making machine can adopt the 25KN hydraulic press, and equipment pressure is set at 4-5.5MPa, is pressed into the high-temperature rock-wool core;
(2), the high-temperature rock-wool whose surfaces is handled, method is:
Prepare a high-pressure spray gun in advance, it is the 15-20 zirconium English powder slurry of second by flow cup that viscosity is housed in the spray gun, and it is stand-by that spray gun is connected compressed air,
The high-temperature rock-wool core that makes is sprayed the zirconium English powder slurry of 0.5mm, make whose surfaces produce the refractory material of a kind of high temperature, gloss, then the core that makes is positioned over thermostatic chamber inner drying 8～12h;
(3), high-temperature rock-wool molding
To put into die cavity exactly through the high-temperature rock-wool core of super-dry, by FYY5 (8)-2 double horizontal hydraulic wax mold die casting machine the cured liquid of good heat insulation is injected die cavity, make the cured mould that has core, after the product examine finishing, with La Mozushu, process for making shell is sent in product examine once more, by coating, stucco, dry, the cured mould that will assemble exactly coated is inserted in the surface layer slurry bucket and is stained with slurry, stucco be will be stained with slurry cured mould in drenching the sand machine evenly on sand, the cured mould that to go up sand again is 22 ℃ of room temperatures, the hothouse inner drying of humidity 60% so repeats to obtain more than five times or five times the multilayer shell of desired thickness; Shell makes it near molten steel temperature through 1160 ℃ roasting, to pour in the shell by the molten steel of energy-conservation quick intermediate frequency furnace refining of JPS type and batching, after waiting to pile part cooling formation, the high-temperature rock-wool core of piece surface shell and part inside is come off naturally by vibrations.
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| CN103639366A (en) * | 2013-09-19 | 2014-03-19 | 沈阳工业大学 | Preparation method for U-shaped hole in casting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103639366A (en) * | 2013-09-19 | 2014-03-19 | 沈阳工业大学 | Preparation method for U-shaped hole in casting |
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