CN105537526A - Forming method of flame-retarding insulating riser - Google Patents
Forming method of flame-retarding insulating riser Download PDFInfo
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- CN105537526A CN105537526A CN201510968076.8A CN201510968076A CN105537526A CN 105537526 A CN105537526 A CN 105537526A CN 201510968076 A CN201510968076 A CN 201510968076A CN 105537526 A CN105537526 A CN 105537526A
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- rising head
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
Abstract
The invention relates to a forming method of a flame-retarding insulating riser. The method includes the steps of manufacturing a mold plate, preparing insulating filler with a flame-retarding effect, putting the filler into the mold plate to obtain a riser prototype, dismounting a mold to obtain a wet riser, and drying the wet riser to form the flame-retarding insulating riser. According to the method, the problem that an existing riser is poor in insulation is solved, combustion of heating materials is prevented, the flame-retarding insulating riser has a good flame retarding effect and an insulating function, and the solidification time of molten metal in the riser is prolonged. Thus, the casting defects such as shrinkage cavities and shrinkage porosity of castings are reduced, and the yield is increased.
Description
Technical field
The invention belongs to casting field, be specifically related to a kind of forming method of fire-retardant heat insulation rising head.
Background technology
In metal casting, generally can use rising head to the thicker large position of foundry goods, hot position of joints, thus utilize the molten metal in rising head to carry out feeding to foundry goods position according to the design feature of foundry goods.Rising head is only attached to above foundry goods or the supplementary part of side for avoiding foundry goods to occur defect.In casting mold, the die cavity of rising head is the cavity of storage liquid metal, the supply metal when foundry goods is formed, and have the effect preventing shrinkage cavity and porosity, exhaust and collection slag, and the Main Function of rising head is feeding.The rising head that function is different, its form, size be not with to offer position all identical.
In the production process of the cast articles such as, heat resisting steel nickelic at blast pipe, turbine case etc., for ensure casting blank Modeling precision, improve molten metal service efficiency and automaticity, use core to substitute traditional hand moulding in recent years gradually.The use of rising head, is also transitioned into insulated feeder, internal heat riser from the general sand rising head of insulation situation, hot riser.But not identical due to cast shape and material, the heat preservation time needing rising head to provide is different.For internal heat riser, existing manufacture craft carries out twice forming process, and first time first makes shaping heating block, and then putting into hot top mould, to carry out rising head more shaping, final become the embedded internal heat riser of output.But this kind is produced and is embedded the technique of exothermic riser and easily cause heating material with insulation material in conjunction with insecure, causes the intensity of rising head body inconsistent, thus causes rising head in the potential safety hazard of casting process Fracture.
In addition, must its anti-flammability be improved in the process that rising head is shaping, because the amount of heat often reacting releasing when casting rising head can not distribute rapidly, causing the temperature of reaction to raise rapidly and exacerbating the burning of generating heat and expecting.As a result, there are hole or oxidation elephant skin on the surface of rising head finished product, finished product time serious, can be caused to scrap.Therefore, prevent in whole rising head forming process because the burning of heating material is one of key technology improving rising head finished product.Therefore, the novel low cost rising head with flame retardant effect and insulation effect is studied imperative.
Summary of the invention
For solving the problem, the invention provides a kind of forming method of fire-retardant heat insulation rising head, this method solve existing rising head and there is the problem that insulation is bad, prevent the burning of heating material, there is good flame retardant effect and insulation effect, extend the setting time of rising head inner metal liquid, and then reduce the casting flaws such as foundry goods shrinkage cavity and porosity, improve yield rate.
The present invention is for solving the problems of the technologies described above the forming method that adopted technical scheme is a kind of fire-retardant heat insulation rising head, and it comprises the following steps:
1) make internal mold, external mold and filler template according to the shape requirement of rising head: internal mold top closure, form column type cavity after closed with external mold, the height of described cavity is identical with external diameter with the height of described fire-retardant heat insulation rising head with internal diameter; The size of filler template is between described internal mold and the size of external mold, and the top end opening of filler template, the top of external mold offers and circular penetrates Sha Kou;
2) preparation has the insulation filler of flame retardant effect:
A. the fire retardant of the diatomite of 20-30 part, the polybenzoate ball of 5-10 part, the magnesia powder of 12-15 part, the quartz sand of 15-20 part, the alumina silicate fibre of 10-15 part, the modification magnesium aluminum-alloy powder of 15-20 part, the brown iron oxide of 8-10 part, the sodium nitrate of 2-5 part, the Fluorspar Powder of 1-2 part, the waterglass of 2-5 part, the aluminum phosphate of 2-3 part, the red mud of 3-5 part and 3-5 part is taken respectively by mass fraction, this fire retardant is the mixture of dodecyl sodium sulfate and boric acid composition, and its weight ratio is 1: 1, wherein on the surface of described polybenzoate ball, be coated with coating, described coating is the composition that aluminosilicate and organic liquid are formed, both weight ratios are 4: 1, described machine liquid is the mixture of silicone oil and glycol ethers, its weight ratio is 2: 1, polybenzoate bead preexpanding to the density using the primitive rule that diameter is 1.2-1.5mm by interval preexpanding device is 10kg/m3, preexpanding pressure is 0.25 bar, the polybenzoate ball that diameter is 3-4mm is obtained after preexpanding, then the composition using aluminosilicate and organic liquid to be formed sprays it, afterwards the polybenzoate ball of the composition being coated with aluminosilicate and organic liquid formation is transferred in pressurized mould, this mold is provided with the interval core bore of multiple rule, the steam of air stream can be applied on this polybenzoate ball by this interval core bore, its surface is made finally to form coating, wherein said modification magnesium aluminum-alloy powder is prepared in melting resistance furnace, the solid slug material magnesium used preparation, aluminium, Al-Sr alloy are cut into block in advance, block size is MAG block, aluminium block: 50 × 50 × 60mm, Al-Sr alloy: 10 × 10 × 10mm, then open smelting furnace after described MAG block and aluminium block being put into smelting furnace, make it rise to 750 DEG C ± 5 DEG C by room temperature, MAG block, aluminium block are melted, programming rate is 9 DEG C/min, afterwards constant temperature, insulation 15-20 minute, add Al-Sr alloy block, and be evenly sprinkled into smelting agent, at 750 DEG C ± 5 DEG C temperature, constant temperature, insulation, standing 15-20 minute, make it be fused into modification magnadure liquation, be cooled to alloy components afterwards, cooled alloy components is carried out cutting, be ground into modification magnesium aluminum-alloy powder further, the weight ratio of described MAG block, aluminium block and Al-Sr alloy block is 100: 10: 1, wherein said boric acid composition is boric acid crystal, ammonium fluoroborate, potassium fluoborate, ammonium fluoride and sulphur, its weight ratio is 4: 2: 1: 1: 2, described boric acid crystal, ammonium fluoroborate, potassium fluoborate, ammonium fluoride and sulphur mix after weighing by proportioning, put into stainless steel jar mill, vacuumize process to ball grinder, vacuum is less than 6Pa, is then filled with inert protective gas, vacuumize-gas replenishment process in triplicate, the air that may exist with emptying ball grinder, the closed ball milling tank vacuumized is put into ball mill, carries out ball milling 3-5 hour, ball milling terminates rear taking-up ball grinder and takes out powder, and its granularity is 150-250 order, finally puts into drying box drying, to obtain final product,
B. carry out pretreatment to muller puddle mixer, that is, cleaned out by puddle mixer, debugging muller, apart from mill disc 30-40mm, then fixes; After pretreatment, the lignin of the waterglass of the amount of taking 50% in the diatomite taken in above-mentioned steps a, magnesia powder, above-mentioned steps a, the red mud of the amount of taking 50% and the amount of taking 40% is placed in muller puddle mixer, mixed 2-3 minute processed, add the quartz sand, alumina silicate fibre, modification magnesium aluminum-alloy powder, brown iron oxide, sodium nitrate and the Fluorspar Powder that take in step a again, mixed 1-2 minute processed, finally add remaining red mud, lignin, waterglass, aluminum phosphate and fire retardant, mixed 2-3 minute processed, obtains wet filler;
3) filler template is entangled the internal mold of rising head, injected the wet filler of Part I by core making machine from the open top end of filler template, the amount of the filler of described Part I is step 2) in preparation there is 40% of the amount of the insulation filler of flame retardant effect;
4) utilize scraper plate to be struck off by the filler unnecessary by internal mold end face, and extrude filler downwards with pressing plate, by its compacting, then leave standstill 2-3 hour; Take off filler template, and change external mold, the circle offered from the top of external mold penetrates sand mouth the injects remainder insulation filler with flame retardant effect by core making machine, then leaves standstill 2-3 hour, obtains rising head just type;
5) wet rising head is obtained to the rising head demoulding: first withdraw from internal mold, internal mold is moved down, under the now rising head just rubbing action of type between itself and the inwall of external mold, and remain in external mold; Then laterally introduce heating supporting plate in the below of external mold and the first type of rising head, make heating supporting plate hold external mold and filler; Micro-ly move external mold, external mold moves 5-8mm, just type and external mold disengage to make rising head; Then move down heating supporting plate, first for rising head type is shifted out completely from external mold, obtains wet rising head;
6) by step 2) in the wet rising head that obtains send into baking oven, under 200-250 DEG C of hot conditions, toast 30-40 minute, namely shapingly obtain fire-retardant heat insulation rising head.
Preferably, in modification magnesium aluminum-alloy powder, the purity of MAG block is 99.9-99.95%, and the purity of aluminium block is 99.1-99.5%, smelting agent to be weight score be not 46% MgCl
2, the NaCl of 41%, the KCl of 8% and 5% CaF
2mixture, its addition is 10% of the MAG block weight in modification magnadure.
In above-mentioned either a program preferably, described diatomaceous granularity is 20-30 order, and the granularity of described quartz sand is 90-120 order, and in quartz sand, the weight content of silica is 96-97%, and the granularity of described magnesia powder is 120-180 order.
In above-mentioned either a program preferably, the quality purity of described brown iron oxide is 99.2-99.5%, and the modulus of described waterglass is 2.2-2.4, and density is 1.50-1.55g/cm
3, the granularity of described red mud is 150-180 order.
In above-mentioned either a program preferably, the boiling point of organic liquid is 140-150 DEG C, and Si: Al mol ratio of described aluminosilicate is 1: 5.
In above-mentioned either a program preferably, the viscosity of described organic liquid at 25 DEG C is 1000-1500mPas, and the density of polybenzoate ball is 50-100kg/m
3, the density comprising the foamed polymer of coating is 150-180kg/m
3.
In above-mentioned either a program preferably, the described anti-flammability of modification magnesium aluminum-alloy powder and the raising of mechanical property are that the form of adding Al-Sr alloy completes.
Beneficial effect of the present invention:
1. the forming method of fire-retardant heat insulation rising head of the present invention reduces energy resource consumption, cost reduces; Obtained rising head inner metal liquid setting time improves more than 2 times than traditional heat preservation rising head, and feeding rate improves more than 20%, has good heat preservation effect, meets production requirement completely.
2. method feeding effect of the present invention is better, casting quality can be guaranteed, make fire-retardant heat insulation rising head obtain mechanical strength to be greatly increased, fine and close diaphragm is formed on rising head surface when making to cast, prevent the carrying out of oxidation, the burning of magnesium alloy in casting mold when preventing casting, is conducive to the rising head finished product obtaining any surface finish, non-oxidation elephant skin; And the present invention increases flame retardant effect from magnadure itself and outside fire retardant two aspect of adding, this does not have any record in the prior art, substantially increases the fire resistance of this rising head.
3. the riser head heat-preserving performance that obtains of the present invention is good, and in rising head, residual metal level only has about 5% of conventional rising head, improves the utilization rate of molten metal, reduces cost, has high temperature resistant, that heat-insulating property is strong advantage.
4. forming method of the present invention does not need to carry out die flip, therefore reduces the defect such as distortion, cracking causing rising head because of the die flip demoulding, thus improves the Forming Quality of rising head.This forming method was both applicable to hand moulding, was also applicable to machine molding.Adopt this explained hereafter, significantly can reduce the labour intensity of workman, save the stand-by period, and then improve operating efficiency; Ensure that the setting of heating material, quantitatively, improve the intensity of rising head body, ensure that the safety of rising head in casting cycle.
Brief Description Of Drawings
Fig. 1 is the process chart of the forming method according to fire-retardant heat insulation rising head of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing and detailed description of the invention, the invention will be further described.
Embodiment 1
See Fig. 1, a kind of forming method of fire-retardant heat insulation rising head, it comprises the following steps:
1) make internal mold, external mold and filler template according to the shape requirement of rising head: internal mold top closure, form column type cavity after closed with external mold, the height of described cavity is identical with external diameter with the height of described fire-retardant heat insulation rising head with internal diameter; The size of filler template is between described internal mold and the size of external mold, and the top end opening of filler template, the top of external mold offers and circular penetrates Sha Kou;
2) preparation has the insulation filler of flame retardant effect:
A. the fire retardant of the diatomite of 20-30 part, the polybenzoate ball of 5-10 part, the magnesia powder of 12-15 part, the quartz sand of 15-20 part, the alumina silicate fibre of 10-15 part, the modification magnesium aluminum-alloy powder of 15-20 part, the brown iron oxide of 8-10 part, the sodium nitrate of 2-5 part, the Fluorspar Powder of 1-2 part, the waterglass of 2-5 part, the aluminum phosphate of 2-3 part, the red mud of 3-5 part and 3-5 part is taken respectively by mass fraction, this fire retardant is the mixture of dodecyl sodium sulfate and boric acid composition, and its weight ratio is 1: 1, wherein on the surface of described polybenzoate ball, be coated with coating, described coating is the composition that aluminosilicate and organic liquid are formed, both weight ratios are 4: 1, described machine liquid is the mixture of silicone oil and glycol ethers, its weight ratio is 2: 1, polybenzoate bead preexpanding to the density using the primitive rule that diameter is 1.2-1.5mm by interval preexpanding device is 10kg/m3, preexpanding pressure is 0.25 bar, the polybenzoate ball that diameter is 3-4mm is obtained after preexpanding, then the composition using aluminosilicate and organic liquid to be formed sprays it, afterwards the polybenzoate ball of the composition being coated with aluminosilicate and organic liquid formation is transferred in pressurized mould, this mold is provided with the interval core bore of multiple rule, the steam of air stream can be applied on this polybenzoate ball by this interval core bore, its surface is made finally to form coating, wherein said modification magnesium aluminum-alloy powder is prepared in melting resistance furnace, the solid slug material magnesium used preparation, aluminium, Al-Sr alloy are cut into block in advance, block size is MAG block, aluminium block: 50 × 50 × 60mm, Al-Sr alloy: 10 × 10 × 10mm, then open smelting furnace after described MAG block and aluminium block being put into smelting furnace, make it rise to 750 DEG C ± 5 DEG C by room temperature, MAG block, aluminium block are melted, programming rate is 9 DEG C/min, afterwards constant temperature, insulation 15-20 minute, add Al-Sr alloy block, and be evenly sprinkled into smelting agent, at 750 DEG C ± 5 DEG C temperature, constant temperature, insulation, standing 15-20 minute, make it be fused into modification magnadure liquation, be cooled to alloy components afterwards, cooled alloy components is carried out cutting, be ground into modification magnesium aluminum-alloy powder further, the weight ratio of described MAG block, aluminium block and Al-Sr alloy block is 100: 10: 1, wherein said boric acid composition is boric acid crystal, ammonium fluoroborate, potassium fluoborate, ammonium fluoride and sulphur, its weight ratio is 4: 2: 1: 1: 2, described boric acid crystal, ammonium fluoroborate, potassium fluoborate, ammonium fluoride and sulphur mix after weighing by proportioning, put into stainless steel jar mill, vacuumize process to ball grinder, vacuum is less than 6Pa, is then filled with inert protective gas, vacuumize-gas replenishment process in triplicate, the air that may exist with emptying ball grinder, the closed ball milling tank vacuumized is put into ball mill, carries out ball milling 3-5 hour, ball milling terminates rear taking-up ball grinder and takes out powder, and its granularity is 150-250 order, finally puts into drying box drying, to obtain final product,
B. carry out pretreatment to muller puddle mixer, that is, cleaned out by puddle mixer, debugging muller, apart from mill disc 30-40mm, then fixes; After pretreatment, the lignin of the waterglass of the amount of taking 50% in the diatomite taken in above-mentioned steps a, magnesia powder, above-mentioned steps a, the red mud of the amount of taking 50% and the amount of taking 40% is placed in muller puddle mixer, mixed 2-3 minute processed, add the quartz sand, alumina silicate fibre, modification magnesium aluminum-alloy powder, brown iron oxide, sodium nitrate and the Fluorspar Powder that take in step a again, mixed 1-2 minute processed, finally add remaining red mud, lignin, waterglass, aluminum phosphate and fire retardant, mixed 2-3 minute processed, obtains wet filler;
3) filler template is entangled the internal mold of rising head, injected the wet filler of Part I by core making machine from the open top end of filler template, the amount of the filler of described Part I is step 2) in preparation there is 40% of the amount of the insulation filler of flame retardant effect;
4) utilize scraper plate to be struck off by the filler unnecessary by internal mold end face, and extrude filler downwards with pressing plate, by its compacting, then leave standstill 2-3 hour; Take off filler template, and change external mold, the circle offered from the top of external mold penetrates sand mouth the injects remainder insulation filler with flame retardant effect by core making machine, then leaves standstill 2-3 hour, obtains rising head just type;
5) wet rising head is obtained to the rising head demoulding: first withdraw from internal mold, internal mold is moved down, under the now rising head just rubbing action of type between itself and the inwall of external mold, and remain in external mold; Then laterally introduce heating supporting plate in the below of external mold and the first type of rising head, make heating supporting plate hold external mold and filler; Micro-ly move external mold, external mold moves 5-8mm, just type and external mold disengage to make rising head; Then move down heating supporting plate, first for rising head type is shifted out completely from external mold, obtains wet rising head;
6) by step 2) in the wet rising head that obtains send into baking oven, under 200-250 DEG C of hot conditions, toast 30-40 minute, namely shapingly obtain fire-retardant heat insulation rising head.
In modification magnesium aluminum-alloy powder, the purity of MAG block is 99.9-99.95%, and the purity of aluminium block is 99.1-99.5%, smelting agent to be weight score be not 46% MgCl
2, the NaCl of 41%, the KCl of 8% and 5% CaF
2mixture, its addition is 10% of the MAG block weight in modification magnadure.
Described diatomaceous granularity is 20-30 order, and the granularity of described quartz sand is 90-120 order, and in quartz sand, the weight content of silica is 96-97%, and the granularity of described magnesia powder is 120-180 order.
The quality purity of described brown iron oxide is 99.2-99.5%, and the modulus of described waterglass is 2.2-2.4, and density is 1.50-1.55g/cm
3, the granularity of described red mud is 150-180 order.
The boiling point of organic liquid is 140-150 DEG C, and Si: Al mol ratio of described aluminosilicate is 1: 5.
The viscosity of described organic liquid at 25 DEG C is 1000-1500mPas, and the density of polybenzoate ball is 50-100kg/m
3, the density comprising the foamed polymer of coating is 150-180kg/m
3.
The described anti-flammability of modification magnesium aluminum-alloy powder and the raising of mechanical property are that the form of adding Al-Sr alloy completes.The surface roughness of the fire-retardant heat insulation rising head of final acquisition is Ra10.5-11.5 μm.
First by mixed to diatomite, magnesia powder, waterglass and aluminum phosphate binder system, for forming the refractory composite layer that one deck contains magnesia powder on diatomite surface, add the materials such as quartz sand again, quartz sand is as the intergranular packing material of expanded vermiculite and fire-resistant skeleton, thus under reaching the prerequisite of certain elevated temperature strength, there is better heat insulation effect.Be mixed in the modification magnesium aluminum-alloy powder in quartz sand and magnesia powder, brown iron oxide, sodium nitrate formation exothermic mixture, can reach speed of ignition fast under Fluorspar Powder modulator effect, the advantage that burning velocity is slow, has good heating effect.After red mud mixes with waterglass, dehydration sclerosis can occur voluntarily, without the need to entering, bake oven is dry can dewater the heat preservation rising head therefore made, and intensity meets the demands.
The forming method of fire-retardant heat insulation rising head of the present invention reduces energy resource consumption, cost reduces; Obtained rising head inner metal liquid setting time improves more than 2 times than traditional heat preservation rising head, and feeding rate improves more than 20%, has good heat preservation effect, meets production requirement completely.Feeding effect of the present invention is better, casting quality can be guaranteed, make fire-retardant heat insulation rising head obtain mechanical strength to be greatly increased, fine and close diaphragm is formed on rising head surface when making to cast, prevent the carrying out of oxidation, the burning of magnesium alloy in casting mold when preventing casting, is conducive to the rising head finished product obtaining any surface finish, non-oxidation elephant skin; And the present invention increases flame retardant effect from magnadure itself and outside fire retardant two aspect of adding, this does not have any record in the prior art, substantially increases the fire resistance of this rising head.
The riser head heat-preserving performance that the present invention obtains is good, and in rising head, residual metal level only has about 5% of conventional rising head, improves the utilization rate of molten metal, reduces cost, has high temperature resistant, that heat-insulating property is strong advantage.In addition, forming method of the present invention does not need to carry out die flip, therefore reduces the defect such as distortion, cracking causing rising head because of the die flip demoulding, thus improves the Forming Quality of rising head.This forming method was both applicable to hand moulding, was also applicable to machine molding.Adopt this explained hereafter, significantly can reduce the labour intensity of workman, save the stand-by period, and then improve operating efficiency; Ensure that the setting of heating material, quantitatively, improve the intensity of rising head body, ensure that the safety of rising head in casting cycle.
The above is only preferred embodiment of the present invention, and be not restriction the present invention being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the Equivalent embodiments of equivalent variations.But everyly do not depart from technical solution of the present invention content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (7)
1. a forming method for fire-retardant heat insulation rising head, is characterized in that comprising the following steps:
1) make internal mold, external mold and filler template according to the shape requirement of rising head: internal mold top closure, form column type cavity after closed with external mold, the height of described cavity is identical with external diameter with the height of described fire-retardant heat insulation rising head with internal diameter; The size of filler template is between described internal mold and the size of external mold, and the top end opening of filler template, the top of external mold offers and circular penetrates Sha Kou;
2) preparation has the insulation filler of flame retardant effect:
A. the fire retardant of the diatomite of 20-30 part, the polybenzoate ball of 5-10 part, the magnesia powder of 12-15 part, the quartz sand of 15-20 part, the alumina silicate fibre of 10-15 part, the modification magnesium aluminum-alloy powder of 15-20 part, the brown iron oxide of 8-10 part, the sodium nitrate of 2-5 part, the Fluorspar Powder of 1-2 part, the waterglass of 2-5 part, the aluminum phosphate of 2-3 part, the red mud of 3-5 part and 3-5 part is taken respectively by mass fraction, this fire retardant is the mixture of dodecyl sodium sulfate and boric acid composition, and its weight ratio is 1: 1, wherein on the surface of described polybenzoate ball, be coated with coating, described coating is the composition that aluminosilicate and organic liquid are formed, both weight ratios are 4: 1, described machine liquid is the mixture of silicone oil and glycol ethers, its weight ratio is 2: 1, polybenzoate bead preexpanding to the density using the primitive rule that diameter is 1.2-1.5mm by interval preexpanding device is 10kg/m3, preexpanding pressure is 0.25 bar, the polybenzoate ball that diameter is 3-4mm is obtained after preexpanding, then the composition using aluminosilicate and organic liquid to be formed sprays it, afterwards the polybenzoate ball of the composition being coated with aluminosilicate and organic liquid formation is transferred in pressurized mould, this mold is provided with the interval core bore of multiple rule, the steam of air stream can be applied on this polybenzoate ball by this interval core bore, its surface is made finally to form coating, wherein said modification magnesium aluminum-alloy powder is prepared in melting resistance furnace, the solid slug material magnesium used preparation, aluminium, Al-Sr alloy are cut into block in advance, block size is MAG block, aluminium block: 50 × 50 × 60mm, Al-Sr alloy: 10 × 10 × 10mm, then open smelting furnace after described MAG block and aluminium block being put into smelting furnace, make it rise to 750 DEG C ± 5 DEG C by room temperature, MAG block, aluminium block are melted, programming rate is 9 DEG C/min, afterwards constant temperature, insulation 15-20 minute, add Al-Sr alloy block, and be evenly sprinkled into smelting agent, at 750 DEG C ± 5 DEG C temperature, constant temperature, insulation, standing 15-20 minute, make it be fused into modification magnadure liquation, be cooled to alloy components afterwards, cooled alloy components is carried out cutting, be ground into modification magnesium aluminum-alloy powder further, the weight ratio of described MAG block, aluminium block and Al-Sr alloy block is 100: 10: 1, wherein said boric acid composition is boric acid crystal, ammonium fluoroborate, potassium fluoborate, ammonium fluoride and sulphur, its weight ratio is 4: 2: 1: 1: 2, described boric acid crystal, ammonium fluoroborate, potassium fluoborate, ammonium fluoride and sulphur mix after weighing by proportioning, put into stainless steel jar mill, vacuumize process to ball grinder, vacuum is less than 6Pa, is then filled with inert protective gas, vacuumize-gas replenishment process in triplicate, the air that may exist with emptying ball grinder, the closed ball milling tank vacuumized is put into ball mill, carries out ball milling 3-5 hour, ball milling terminates rear taking-up ball grinder and takes out powder, and its granularity is 150-250 order, finally puts into drying box drying, to obtain final product,
B. carry out pretreatment to muller puddle mixer, that is, cleaned out by puddle mixer, debugging muller, apart from mill disc 30-40mm, then fixes; After pretreatment, the lignin of the waterglass of the amount of taking 50% in the diatomite taken in above-mentioned steps a, magnesia powder, above-mentioned steps a, the red mud of the amount of taking 50% and the amount of taking 40% is placed in muller puddle mixer, mixed 2-3 minute processed, add the quartz sand, alumina silicate fibre, modification magnesium aluminum-alloy powder, brown iron oxide, sodium nitrate and the Fluorspar Powder that take in step a again, mixed 1-2 minute processed, finally add remaining red mud, lignin, waterglass, aluminum phosphate and fire retardant, mixed 2-3 minute processed, obtains wet filler;
3) filler template is entangled the internal mold of rising head, injected the wet filler of Part I by core making machine from the open top end of filler template, the amount of the filler of described Part I is step 2) in preparation there is 40% of the amount of the insulation filler of flame retardant effect;
4) utilize scraper plate to be struck off by the filler unnecessary by internal mold end face, and extrude filler downwards with pressing plate, by its compacting, then leave standstill 2-3 hour; Take off filler template, and change external mold, the circle offered from the top of external mold penetrates sand mouth the injects remainder insulation filler with flame retardant effect by core making machine, then leaves standstill 2-3 hour, obtains rising head just type;
5) wet rising head is obtained to the rising head demoulding: first withdraw from internal mold, internal mold is moved down, under the now rising head just rubbing action of type between itself and the inwall of external mold, and remain in external mold; Then laterally introduce heating supporting plate in the below of external mold and the first type of rising head, make heating supporting plate hold external mold and filler; Micro-ly move external mold, external mold moves 5-8mm, just type and external mold disengage to make rising head; Then move down heating supporting plate, first for rising head type is shifted out completely from external mold, obtains wet rising head;
6) by step 2) in the wet rising head that obtains send into baking oven, under 200-250 DEG C of hot conditions, toast 30-40 minute, namely shapingly obtain fire-retardant heat insulation rising head.
2. the forming method of fire-retardant heat insulation rising head according to claim 1, is characterized in that the purity of MAG block in modification magnesium aluminum-alloy powder is 99.9-99.95%, and the purity of aluminium block is 99.1-99.5%, smelting agent to be weight score be not 46% MgCl
2, the NaCl of 41%, the KCl of 8% and 5% CaF
2mixture, its addition is 10% of the MAG block weight in modification magnadure.
3. the forming method of fire-retardant heat insulation rising head according to claim 1 and 2, it is characterized in that described diatomaceous granularity is 20-30 order, the granularity of described quartz sand is 90-120 order, and in quartz sand, the weight content of silica is 96-97%, and the granularity of described magnesia powder is 120-180 order.
4. the forming method of the fire-retardant heat insulation rising head according to claim 1-3, is characterized in that the quality purity of described brown iron oxide is 99.2-99.5%, and the modulus of described waterglass is 2.2-2.4, and density is 1.50-1.55g/cm
3, the granularity of described red mud is 150-180 order.
5. the forming method of the fire-retardant heat insulation rising head according to claim 1-4, is characterized in that the boiling point of organic liquid is 140-150 DEG C, and Si: Al mol ratio of described aluminosilicate is 1: 5.
6. the forming method of the fire-retardant heat insulation rising head according to claim 1-5, is characterized in that the viscosity of described organic liquid at 25 DEG C is 1000-1500mPas, and the density of polybenzoate ball is 50-100kg/m
3, the density comprising the foamed polymer of coating is 150-180kg/m
3.
7. the forming method of the fire-retardant heat insulation rising head according to claim 1-6, is characterized in that the described anti-flammability of modification magnesium aluminum-alloy powder and the raising of mechanical property are that the form of adding Al-Sr alloy completes.
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| CN106424534A (en) * | 2016-11-08 | 2017-02-22 | 上海航天精密机械研究所 | Mg-alloy casting sand |
| CN107931532A (en) * | 2017-12-12 | 2018-04-20 | 重庆乐迪机车车辆配件有限公司 | A kind of novel heat insulation exothermic riser sleeve |
| CN108453246A (en) * | 2018-05-15 | 2018-08-28 | 姜香 | A kind of cast steel insulated feeder coverture and preparation method thereof |
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