CN106756273A - A kind of preparation method of automobile air-conditioning pipe - Google Patents

A kind of preparation method of automobile air-conditioning pipe Download PDF

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Publication number
CN106756273A
CN106756273A CN201611154619.3A CN201611154619A CN106756273A CN 106756273 A CN106756273 A CN 106756273A CN 201611154619 A CN201611154619 A CN 201611154619A CN 106756273 A CN106756273 A CN 106756273A
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strand
air
stove
room temperature
cooled
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翁华明
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Suzhou Rich Industrial Equipment Co Ltd
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Suzhou Rich Industrial Equipment Co Ltd
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Priority to CN201611154619.3A priority Critical patent/CN106756273A/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/22—Moulds for peculiarly-shaped castings
    • B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/026—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/18—Applications used for pipes

Abstract

The invention discloses a kind of preparation method of automobile air-conditioning pipe, the preparation method is simple and easy to apply, and the automobile air-conditioning pipe prepared has good anticorrosion, extends its service life.

Description

A kind of preparation method of automobile air-conditioning pipe
Technical field
The present invention relates to a kind of auto parts machinery, and in particular to a kind of preparation method of automobile air-conditioning pipe.
Background technology
At present, the material of air-conditioner pipe is mainly ferroalloy or copper alloy, but because the thermal conductivity factor of ferroalloy pipe is not high, and Thermal conductivity factor using copper pipe is high, but the cost of copper is also higher, and the ratio of copper is great, increases the overall weight of air-conditioning.
Although the thermal conductivity factor of aluminium is lower than copper, higher than the thermal conductivity factor of iron is a lot, and the proportion of aluminium is low, is closed with aluminium Gold manufactures air-conditioning heat exchange pipe to substitute copper or iron and has many good qualities, but existing aluminium alloy is finally being processed into thin-walled During tubing, because the ductility of aluminium alloy is lower and easy than copper to there are rupture or leakage phenomenon, and existing aluminum alloy materials Corrosion Protection cross less than requiring.
The content of the invention
The technical problems to be solved by the invention are, for the shortcoming that above prior art is present, propose that a kind of automobile is empty The preparation method of pipe is adjusted, the preparation method is simple and easy to apply, and the automobile air-conditioning pipe prepared has good anticorrosion, and extending it makes Use the life-span.
The present invention solve above technical problem technical scheme be：
A kind of preparation method of automobile air-conditioning pipe, layer protective layer is provided with the air-conditioner pipe, and following step is pressed in the preparation of the air-conditioner pipe Suddenly carry out：
（1）Shape according to the automobile air-conditioning pipe corresponding casting mold with quartz sand, waterglass and bentonite as Modeling Material is blended out, And cast gate is provided with casting mold, casting mold then is carried out into roars of laughter with warm wind blows, and is subsequently placed in baker and is dried at 150-190 DEG C It is dry, it is stand-by；
（2）The each component of air-conditioner pipe raw material is allocated, and each group is distributed into EBT electric arc furnaces, and slightly refining causes each component fusing And oxidation, the temperature of thick refining is 200-300 DEG C, and the duration of heat is 1-2h, is then re-fed into LF refining furnace and is refined and deaerated Work, obtains dissolving liquid, and smelting temperature is 500-750 DEG C, and the duration of heat is 2-3.5h, then stands 15- at 400-500 DEG C 20min；Chemical Calculation is carried out in smelting process, strict control air-conditioner pipe each component is by mass percentage：
Mg：2-4%, Fe：3-5%, Zn：0.1-0.2%, Si：1-1.3%, Cu：0.08-0.09%, Mn：0.2-0.4%, C：0.01- 0.03%, Co：2-4%, W：0.2-0.6%, Cr：0.1-0.4%, P：0.02-0.05%, S：0.023-0.35%, Nb：0.03- 0.06%, Ti：0.05-0.09%, Ta：0.02-0.06%, rare earth element：0.5-0.9%, remaining is aluminium；
Rare earth element is：Cerium：10-14%, dysprosium：5-9%, bait：6-8%, terbium：10-15%, lutetium：5-9%, ytterbium：8-10%, praseodymium：9-11%, Balance of remaining lanthanide series；
（3）By step（2）In the stable implantation step of dissolving liquid that obtains（1）In in ready casting mold, pouring temperature is 500-600 DEG C, poring rate is 50-55kg/s, and the duration of pouring is 15-25s, obtains strand；
（4）Strand is rolled, heating furnace heating-up temperature is delivered to for 200-250 DEG C, 1-3h is heated, start rolling temperature is 100- 115 DEG C, at 200-220 DEG C, finish rolling finishing temperature is controlled at 250-290 DEG C roughing finishing temperature control, by the casting after rolling Base speed is cooled to 100-170 DEG C, is then air cooled to room temperature；
（5）Casting billet surface to rolling is cleared up with stainless steel brush or emery wheel, is then immersed in the mixing of nitric acid and hydrofluoric acid Pickling in solution, is finally rinsed well with clear water, the strand after cleaning is annealed successively after drying, quench, is tempered Treatment, is then cooled to room temperature through refrigerating work procedure, wherein：
Annealing：12-16min is incubated when strand stove heat is to 600-650 DEG C, then stove is cooled to 300-330 DEG C, then turns on fire door Continuation slow cooling is come out of the stove to 120-150 DEG C and is air cooled to room temperature；
Quenching：By the slow stove heat of strand after annealing is to 450-500 DEG C and is incubated 30-60min, stove heat is to 620-660 DEG C again Water spray strand fast cooling is used afterwards；
Tempering：Strand after will be quenched enters stove again at room temperature and stove heat is cold through refrigerating work procedure to coming out of the stove after 220-270 DEG C But to room temperature；
（6）Strand after treatment carries out tension straingtening, and will deform larger head and afterbody excision, and the section bar after aligning is through drawing Stretch to align and park and carry out artificial aging cure process after certain hour and obtain semi-finished product；
（7）Protective layer is squeezed into air-conditioner pipe semi-finished product by lubricating oil, the protective layer includes following according to the mass fraction Component：Raw-silastic continuously：80-90 parts, nanometer SiC powder：5-7 parts, polyphenylene oxide resin powder：10-15 parts, catalyst：15-20 Part, heat stabilizer：5-10 parts, fire resistant infilling：5-8 parts, coupling agent：20-30 parts.
（8）The finished product that will be obtained is through follow-up physical and chemical inspection and the last cleaned packaging and storage of ultrasonic examination.
The of the invention technical scheme for further limiting as：
In the preparation method of aforementioned automotive air-conditioner pipe, raw-silastic continuously is methyl vinyl silicone rubber；Described coupling agent is silicon Alkane coupling agent；Described catalyst is the one kind in aluminum oxide, NaOH or potassium hydroxide；Described heat stabilizer is 2- Ethyl hexyl hydrochlorate；Described fire resistant infilling is white carbon, mica, calcium carbonate, wollastonite, kaolin, talcum powder, glass dust or illiteracy Obtain a kind of in de- soil.
In the preparation method of aforementioned automotive air-conditioner pipe, the preparation technology of protective layer specifically includes following steps：
（1）Raw-silastic continuously, polyphenylene oxide resin powder, catalyst, heat stabilizer are added in internal rubber mixer, mixing speed It is 100-120r/min, mixing time is 50-55min；
（2）Then while stirring to step（1）In closed rubber mixing machine in add fire resistant infilling, nanometer SiC powder and coupling agent, Continue to stir, mixing speed is 100-150r/min, and mixing time is 20-30min, then heats to 180-200 DEG C, in insulation 1-2h, then slowly cools to 100-120 DEG C, is incubated 0.5-1h, finally naturally cools to room temperature；
（3）Being cooled to during the mixture of room temperature delivers to opening rubber mixing machine carries out refining glue, and then extruder extrusion forming can be obtained To protective layer.
The beneficial effects of the invention are as follows：
The cooling velocity of homo genizing annelaing has obvious influence on the tissue of section bar, surface gloss, during Slow cooling in alloy Mg2Si phases are in thick needle-lees thing, are not easily dissolved during heating before extruding；
The present invention is using homogenization and cools down, and is, in order to eliminate the microsegregation in ingot casting, to reduce its chemical composition, tissue not Uniformity coefficient, to improve the intensity of section bar；Improve the extrudability energy of blank, be easy to extrusion process；Improve the corrosion-resistant of alloy Performance.
Adding Ti in the present invention in composition can be with crystal grain thinning, and rapid solidification can equally refine dendrite, make alloy Extrusion performance is improved.Cu is added in the present invention, except hardening constituent CuAl can be formed2Outward, can also be with the Mg in alloy Form High-Temperature Strengthening phase CuMgAl2, crystal grain thinning, the formation in prevention hole, the precipitation of suppression Si, so as to improve the tough of alloy Property；Additionally, adding the Mg that Cu can be in refining alloy2Low-alloyed quenching sensitivity, drops in Si precipitated phases, resists without reducing alloy Shear ability.Zr, Mn, Cr are added in the present invention can improve the quenching sensitivity of alloy, and Zr is added while Mn is added Fibr tissue maintains a high level during alloy can be made, and is significantly larger than individually added into a kind of the reached effect in both Really；Addition Cr can also crystal grain thinning, reservation fibr tissue, so as to improve the wilfulness of alloy；Fe is also added into the present invention can To refine Mg2Si particles and crystal grain, Si atoms is left crystal boundary, improve the toughness of alloy.
The present invention is first dried in cast to casting mold, can reduce the polishing workload in later stage, reduces later stage soldering Workload, the pulling force in reduction casting process between cold and hot molten steel, it is to avoid organization internal is loose while reduction cast(ing) surface is trickle Stomata produce.
Specific embodiment
Embodiment 1
The present embodiment provides a kind of preparation method of automobile air-conditioning pipe, and layer protective layer, the described air-conditioning are provided with the air-conditioner pipe The preparation of pipe is carried out according to the following steps：
（1）Shape according to the automobile air-conditioning pipe corresponding casting mold with quartz sand, waterglass and bentonite as Modeling Material is blended out, And cast gate is provided with casting mold, casting mold then is carried out into roars of laughter with warm wind blows, and is subsequently placed in baker and is dried at 150-190 DEG C It is dry, it is stand-by；
（2）The each component of air-conditioner pipe raw material is allocated, and each group is distributed into EBT electric arc furnaces, and slightly refining causes each component fusing And oxidation, the temperature of thick refining is 200 DEG C, and the duration of heat is 1h, is then re-fed into LF refining furnace and is refined and deaerated work, is obtained To dissolving liquid, smelting temperature is 500 DEG C, and the duration of heat is 2h, then stands 15min at 400 DEG C；Carried out in smelting process Chemical Calculation, strict control air-conditioner pipe each component is by mass percentage：
Mg：2%, Fe：3%, Zn：0.1%, Si：1%, Cu：0.08-%, Mn：0.2%, C：0.01%, Co：2%, W：0.2%, Cr：0.1%, P：0.02%, S：0.023%, Nb：0.03%, Ti：0.05%, Ta：0.02%, rare earth element：0.5%, remaining is aluminium；
Rare earth element is：Cerium：10%, dysprosium：5%, bait：6%, terbium：10%, lutetium：5%, ytterbium：8%, praseodymium：9%, balance of remaining group of the lanthanides unit Element；
（3）By step（2）In the stable implantation step of dissolving liquid that obtains（1）In in ready casting mold, pouring temperature is 500 DEG C, poring rate is 50kg/s, and the duration of pouring is 15s, obtains strand；
（4）Strand is rolled, heating furnace heating-up temperature is delivered to for 200 DEG C, 1h is heated, start rolling temperature is 100 DEG C, roughing end Temperature control is rolled at 200 DEG C, and finish rolling finishing temperature is controlled at 250 DEG C, the strand speed after rolling is cooled into 100 DEG C, then It is air cooled to room temperature；
（5）Casting billet surface to rolling is cleared up with stainless steel brush or emery wheel, is then immersed in the mixing of nitric acid and hydrofluoric acid Pickling in solution, is finally rinsed well with clear water, the strand after cleaning is annealed successively after drying, quench, is tempered Treatment, is then cooled to room temperature through refrigerating work procedure, wherein：
Annealing：12min is incubated when strand stove heat is to 600 DEG C, then stove is cooled to 300 DEG C, then turns on fire door and continue slow cooling extremely Come out of the stove for 120 DEG C and be air cooled to room temperature；
Quenching：By the slow stove heat of strand after annealing is to 450 DEG C and is incubated 30min, stove heat with Water spray to being cast after 620 DEG C again Base fast cooling；
Tempering：Strand after will be quenched enters stove again at room temperature and stove heat be cooled to through refrigerating work procedure to being come out of the stove after 220 DEG C Room temperature；
（6）Strand after treatment carries out tension straingtening, and will deform larger head and afterbody excision, and the section bar after aligning is through drawing Stretch to align and park and carry out artificial aging cure process after certain hour and obtain semi-finished product；
（7）Protective layer is squeezed into air-conditioner pipe semi-finished product by lubricating oil, the protective layer includes following according to the mass fraction Component：Raw-silastic continuously：80 parts, nanometer SiC powder：5 parts, polyphenylene oxide resin powder：10 parts, catalyst：15 parts, heat stabilizer：5 Part, fire resistant infilling：5 parts, coupling agent：20 parts.
（8）The finished product that will be obtained is through follow-up physical and chemical inspection and the last cleaned packaging and storage of ultrasonic examination.
Raw-silastic continuously is methyl vinyl silicone rubber；Coupling agent is silane coupler；Catalyst is aluminum oxide, hydroxide One kind in sodium or potassium hydroxide；Heat stabilizer is 2 ethyl hexanoic acid salt；Fire resistant infilling is white carbon, mica, calcium carbonate, silicon Obtained in lime stone, kaolin, talcum powder, glass dust or montmorillonite a kind of.
The preparation technology of protective layer specifically includes following steps：
（1）Raw-silastic continuously, polyphenylene oxide resin powder, catalyst, heat stabilizer are added in internal rubber mixer, mixing speed It is 100r/min, mixing time is 50min；
（2）Then while stirring to step（1）In closed rubber mixing machine in add fire resistant infilling, nanometer SiC powder and coupling agent, Continue to stir, mixing speed is 100r/min, and mixing time is 20min, then heats to 180 DEG C, be incubated 1h, then slowly 100 DEG C are cooled to, 0.5h is incubated, room temperature is finally naturally cooled to；
（3）Being cooled to during the mixture of room temperature delivers to opening rubber mixing machine carries out refining glue, and then extruder extrusion forming can be obtained To protective layer.
Embodiment 2
The present embodiment provides a kind of preparation method of automobile air-conditioning pipe, and layer protective layer, the described air-conditioning are provided with the air-conditioner pipe The preparation of pipe is carried out according to the following steps：
（1）Shape according to the automobile air-conditioning pipe corresponding casting mold with quartz sand, waterglass and bentonite as Modeling Material is blended out, And cast gate is provided with casting mold, casting mold then is carried out into roars of laughter with warm wind blows, and is subsequently placed in baker and is dried at 150-190 DEG C It is dry, it is stand-by；
（2）The each component of air-conditioner pipe raw material is allocated, and each group is distributed into EBT electric arc furnaces, and slightly refining causes each component fusing And oxidation, the temperature of thick refining is 300 DEG C, and the duration of heat is 2h, is then re-fed into LF refining furnace and is refined and deaerated work, is obtained To dissolving liquid, smelting temperature is 750 DEG C, and the duration of heat is 3.5h, then stands 20min at 500 DEG C；Enter in smelting process Row Chemical Calculation, strict control air-conditioner pipe each component is by mass percentage：
Mg：4%, Fe：5%, Zn：0.2%, Si：1.3%, Cu：0.09%, Mn：0.4%, C：0.03%, Co：4%, W：0.6%, Cr： 0.4%, P：0.05%, S：0.35%, Nb：0.06%, Ti：0.09%, Ta：0.02-0.06%, rare earth element：0.9%, remaining is aluminium；
Rare earth element is：Cerium：14%, dysprosium：9%, bait：8%, terbium：15%, lutetium：9%, ytterbium：10%, praseodymium：11%, balance of remaining group of the lanthanides unit Element；
（3）By step（2）In the stable implantation step of dissolving liquid that obtains（1）In in ready casting mold, pouring temperature is 600 DEG C, poring rate is 55kg/s, and the duration of pouring is 25s, obtains strand；
（4）Strand is rolled, heating furnace heating-up temperature is delivered to for 250 DEG C, 3h is heated, start rolling temperature is 115 DEG C, roughing end Temperature control is rolled at 220 DEG C, and finish rolling finishing temperature is controlled at 290 DEG C, the strand speed after rolling is cooled into 170 DEG C, then It is air cooled to room temperature；
（5）Casting billet surface to rolling is cleared up with stainless steel brush or emery wheel, is then immersed in the mixing of nitric acid and hydrofluoric acid Pickling in solution, is finally rinsed well with clear water, the strand after cleaning is annealed successively after drying, quench, is tempered Treatment, is then cooled to room temperature through refrigerating work procedure, wherein：
Annealing：16min is incubated when strand stove heat is to 650 DEG C, then stove is cooled to 330 DEG C, then turns on fire door and continue slow cooling extremely Come out of the stove for 150 DEG C and be air cooled to room temperature；
Quenching：By the slow stove heat of strand after annealing is to 500 DEG C and is incubated 60min, stove heat with Water spray to being cast after 660 DEG C again Base fast cooling；
Tempering：Strand after will be quenched enters stove again at room temperature and stove heat be cooled to through refrigerating work procedure to being come out of the stove after 270 DEG C Room temperature；
（6）Strand after treatment carries out tension straingtening, and will deform larger head and afterbody excision, and the section bar after aligning is through drawing Stretch to align and park and carry out artificial aging cure process after certain hour and obtain semi-finished product；
（7）Protective layer is squeezed into air-conditioner pipe semi-finished product by lubricating oil, the protective layer includes following according to the mass fraction Component：90 parts of raw-silastic continuously, nanometer SiC powder：7 parts, polyphenylene oxide resin powder：15 parts, catalyst：20 parts, heat stabilizer：10 Part, fire resistant infilling：8 parts, coupling agent：30 parts.
（8）The finished product that will be obtained is through follow-up physical and chemical inspection and the last cleaned packaging and storage of ultrasonic examination.
Raw-silastic continuously is methyl vinyl silicone rubber；Coupling agent is silane coupler；Catalyst is aluminum oxide, hydroxide One kind in sodium or potassium hydroxide；Heat stabilizer is 2 ethyl hexanoic acid salt；Fire resistant infilling is white carbon, mica, calcium carbonate, silicon Obtained in lime stone, kaolin, talcum powder, glass dust or montmorillonite a kind of.
The preparation technology of protective layer specifically includes following steps：
（1）Raw-silastic continuously, polyphenylene oxide resin powder, catalyst, heat stabilizer are added in internal rubber mixer, mixing speed It is 120r/min, mixing time is 55min；
（2）Then while stirring to step（1）In closed rubber mixing machine in add fire resistant infilling, nanometer SiC powder and coupling agent, Continue to stir, mixing speed is 150r/min, and mixing time is 30min, then heats to 200 DEG C, be incubated 2h, then slowly 120 DEG C are cooled to, 1h is incubated, room temperature is finally naturally cooled to；
（3）Being cooled to during the mixture of room temperature delivers to opening rubber mixing machine carries out refining glue, and then extruder extrusion forming can be obtained To protective layer.
Embodiment 3
The present embodiment provides a kind of preparation method of automobile air-conditioning pipe, and layer protective layer, the described air-conditioning are provided with the air-conditioner pipe The preparation of pipe is carried out according to the following steps：
（1）Shape according to the automobile air-conditioning pipe corresponding casting mold with quartz sand, waterglass and bentonite as Modeling Material is blended out, And cast gate is provided with casting mold, casting mold then is carried out into roars of laughter with warm wind blows, and is subsequently placed in baker and is dried at 170 DEG C, It is stand-by；
（2）The each component of air-conditioner pipe raw material is allocated, and each group is distributed into EBT electric arc furnaces, and slightly refining causes each component fusing And oxidation, the temperature of thick refining is 250 DEG C, and the duration of heat is 1h, is then re-fed into LF refining furnace and is refined and deaerated work, is obtained To dissolving liquid, smelting temperature is 650 DEG C, and the duration of heat is 3h, then stands 18min at 450 DEG C；Carried out in smelting process Chemical Calculation, strict control air-conditioner pipe each component is by mass percentage：
Mg：3%, Fe：4%, Zn：0.15%, Si：1.1%, Cu：0.08%, Mn：0.3%, C：0.02%, Co：3%, W：0.4%, Cr： 0.3%, P：0.04%, S：0.029%, Nb：0.05%, Ti：0.07%, Ta：0.04%, rare earth element：0.7%, remaining is aluminium；
Rare earth element is：Cerium：13%, dysprosium：7%, bait：7%, terbium：13%, lutetium：7%, ytterbium：9%, praseodymium：10%, balance of remaining group of the lanthanides unit Element；
（3）By step（2）In the stable implantation step of dissolving liquid that obtains（1）In in ready casting mold, pouring temperature is 550 DEG C, poring rate is 53kg/s, and the duration of pouring is 20s, obtains strand；
（4）Strand is rolled, heating furnace heating-up temperature is delivered to for 220 DEG C, 2h is heated, start rolling temperature is 105 DEG C, roughing end Temperature control is rolled at 210 DEG C, and finish rolling finishing temperature is controlled at 270 DEG C, the strand speed after rolling is cooled into 150 DEG C, then It is air cooled to room temperature；
（5）Casting billet surface to rolling is cleared up with stainless steel brush or emery wheel, is then immersed in the mixing of nitric acid and hydrofluoric acid Pickling in solution, is finally rinsed well with clear water, the strand after cleaning is annealed successively after drying, quench, is tempered Treatment, is then cooled to room temperature through refrigerating work procedure, wherein：
Annealing：14min is incubated when strand stove heat is to 630 DEG C, then stove is cooled to 340 DEG C, then turns on fire door and continue slow cooling extremely Come out of the stove for 130 DEG C and be air cooled to room temperature；
Quenching：By the slow stove heat of strand after annealing is to 480 DEG C and is incubated 50min, stove heat with Water spray to being cast after 640 DEG C again Base fast cooling；
Tempering：Strand after will be quenched enters stove again at room temperature and stove heat be cooled to through refrigerating work procedure to being come out of the stove after 250 DEG C Room temperature；
（6）Strand after treatment carries out tension straingtening, and will deform larger head and afterbody excision, and the section bar after aligning is through drawing Stretch to align and park and carry out artificial aging cure process after certain hour and obtain semi-finished product；
（7）Protective layer is squeezed into air-conditioner pipe semi-finished product by lubricating oil, the protective layer includes following according to the mass fraction Component：Raw-silastic continuously：85 parts, nanometer SiC powder：6 parts, polyphenylene oxide resin powder：13 parts, catalyst：18 parts, heat stabilizer：8 Part, fire resistant infilling：7 parts, coupling agent：25 parts.
（8）The finished product that will be obtained is through follow-up physical and chemical inspection and the last cleaned packaging and storage of ultrasonic examination.
Raw-silastic continuously is methyl vinyl silicone rubber；Coupling agent is silane coupler；Catalyst is aluminum oxide, hydroxide One kind in sodium or potassium hydroxide；Heat stabilizer is 2 ethyl hexanoic acid salt；Fire resistant infilling is white carbon, mica, calcium carbonate, silicon Obtained in lime stone, kaolin, talcum powder, glass dust or montmorillonite a kind of.
The preparation technology of protective layer specifically includes following steps：
（1）Raw-silastic continuously, polyphenylene oxide resin powder, catalyst, heat stabilizer are added in internal rubber mixer, mixing speed It is 110r/min, mixing time is 53min；
（2）Then while stirring to step（1）In closed rubber mixing machine in add fire resistant infilling, nanometer SiC powder and coupling agent, Continue to stir, mixing speed is 130r/min, and mixing time is 25min, then heats to 190 DEG C, be incubated 2h, then slowly 110 DEG C are cooled to, 0.8h is incubated, room temperature is finally naturally cooled to；
（3）Being cooled to during the mixture of room temperature delivers to opening rubber mixing machine carries out refining glue, and then extruder extrusion forming can be obtained To protective layer.
In addition to the implementation, the present invention can also have other embodiment.All use equivalents or equivalent transformation shape Into technical scheme, all fall within the protection domain of application claims.

Claims (3)

1. a kind of preparation method of automobile air-conditioning pipe, it is characterised in that layer protective layer, the described air-conditioning are provided with the air-conditioner pipe The preparation of pipe is carried out according to the following steps：
（1）Shape according to the automobile air-conditioning pipe corresponding casting mold with quartz sand, waterglass and bentonite as Modeling Material is blended out, And cast gate is provided with casting mold, casting mold then is carried out into roars of laughter with warm wind blows, and is subsequently placed in baker and is dried at 150-190 DEG C It is dry, it is stand-by；
（2）The each component of air-conditioner pipe raw material is allocated, and each group is distributed into EBT electric arc furnaces, and slightly refining causes each component fusing And oxidation, the temperature of thick refining is 200-300 DEG C, and the duration of heat is 1-2h, is then re-fed into LF refining furnace and is refined and deaerated Work, obtains dissolving liquid, and smelting temperature is 500-750 DEG C, and the duration of heat is 2-3.5h, then stands 15- at 400-500 DEG C 20min；Chemical Calculation is carried out in smelting process, strict control air-conditioner pipe each component is by mass percentage：
Mg：2-4%, Fe：3-5%, Zn：0.1-0.2%, Si：1-1.3%, Cu：0.08-0.09%, Mn：0.2-0.4%, C：0.01- 0.03%, Co：2-4%, W：0.2-0.6%, Cr：0.1-0.4%, P：0.02-0.05%, S：0.023-0.35%, Nb：0.03- 0.06%, Ti：0.05-0.09%, Ta：0.02-0.06%, rare earth element：0.5-0.9%, remaining is aluminium；
Described rare earth element is：Cerium：10-14%, dysprosium：5-9%, bait：6-8%, terbium：10-15%, lutetium：5-9%, ytterbium：8-10%, praseodymium： 9-11%, balance of remaining lanthanide series；
（3）By step（2）In the stable implantation step of dissolving liquid that obtains（1）In in ready casting mold, pouring temperature is 500-600 DEG C, poring rate is 50-55kg/s, and the duration of pouring is 15-25s, obtains strand；
（4）Strand is rolled, heating furnace heating-up temperature is delivered to for 200-250 DEG C, 1-3h is heated, start rolling temperature is 100- 115 DEG C, at 200-220 DEG C, finish rolling finishing temperature is controlled at 250-290 DEG C roughing finishing temperature control, by the casting after rolling Base speed is cooled to 100-170 DEG C, is then air cooled to room temperature；
（5）Casting billet surface to rolling is cleared up with stainless steel brush or emery wheel, is then immersed in the mixing of nitric acid and hydrofluoric acid Pickling in solution, is finally rinsed well with clear water, the strand after cleaning is annealed successively after drying, quench, is tempered Treatment, is then cooled to room temperature through refrigerating work procedure, wherein：
Annealing：12-16min is incubated when strand stove heat is to 600-650 DEG C, then stove is cooled to 300-330 DEG C, then turns on fire door Continuation slow cooling is come out of the stove to 120-150 DEG C and is air cooled to room temperature；
Quenching：By the slow stove heat of strand after annealing is to 450-500 DEG C and is incubated 30-60min, stove heat is to 620-660 DEG C again Water spray strand fast cooling is used afterwards；
Tempering：Strand after will be quenched enters stove again at room temperature and stove heat is cold through refrigerating work procedure to coming out of the stove after 220-270 DEG C But to room temperature；
（6）Strand after treatment carries out tension straingtening, and will deform larger head and afterbody excision, and the section bar after aligning is through drawing Stretch to align and park and carry out artificial aging cure process after certain hour and obtain semi-finished product；
（7）Protective layer is squeezed into air-conditioner pipe semi-finished product by lubricating oil, the protective layer includes following according to the mass fraction Component：Raw-silastic continuously：80-90 parts, nanometer SiC powder：5-7 parts, polyphenylene oxide resin powder：10-15 parts, catalyst：15-20 Part, heat stabilizer：5-10 parts, fire resistant infilling：5-8 parts, coupling agent：20-30 parts；
（8）The finished product that will be obtained is through follow-up physical and chemical inspection and the last cleaned packaging and storage of ultrasonic examination.
2. the preparation method of automobile air-conditioning pipe according to claim 1, it is characterised in that：Described raw-silastic continuously is first Base vinylsiloxane rubber；Described coupling agent is silane coupler；Described catalyst is aluminum oxide, NaOH or hydrogen-oxygen Change the one kind in potassium；Described heat stabilizer is 2 ethyl hexanoic acid salt；Described fire resistant infilling be white carbon, mica, calcium carbonate, Obtained in wollastonite, kaolin, talcum powder, glass dust or montmorillonite a kind of.
3. the preparation method of automobile air-conditioning pipe according to claim 1, it is characterised in that：The preparation work of described protective layer Skill specifically includes following steps：
（1）Raw-silastic continuously, polyphenylene oxide resin powder, catalyst, heat stabilizer are added in internal rubber mixer, mixing speed It is 100-120r/min, mixing time is 50-55min；
（2）Then while stirring to step（1）In closed rubber mixing machine in add fire resistant infilling, nanometer SiC powder and coupling agent, Continue to stir, mixing speed is 100-150r/min, and mixing time is 20-30min, then heats to 180-200 DEG C, in insulation 1-2h, then slowly cools to 100-120 DEG C, is incubated 0.5-1h, finally naturally cools to room temperature；
（3）Being cooled to during the mixture of room temperature delivers to opening rubber mixing machine carries out refining glue, and then extruder extrusion forming can be obtained To protective layer.
CN201611154619.3A 2016-12-14 2016-12-14 A kind of preparation method of automobile air-conditioning pipe Pending CN106756273A (en)

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CN110527879A (en) * 2019-09-27 2019-12-03 中南大学 Aluminum alloy materials and preparation method, fixing piece and processing method, floor heating structure
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