CN107790681A - A kind of Engine Cylinder Block ＆ Cylinder Head bimetal composite casting method - Google Patents

A kind of Engine Cylinder Block ＆ Cylinder Head bimetal composite casting method Download PDF

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Publication number
CN107790681A
CN107790681A CN201711013162.9A CN201711013162A CN107790681A CN 107790681 A CN107790681 A CN 107790681A CN 201711013162 A CN201711013162 A CN 201711013162A CN 107790681 A CN107790681 A CN 107790681A
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Prior art keywords
cast iron
casting
cylinder head
casting method
cylinder block
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Pending
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CN201711013162.9A
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Chinese (zh)
Inventor
夏建强
常峰
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Anhui Hengli Additive Manufacturing Technology Co Ltd
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Anhui Hengli Additive Manufacturing Technology Co Ltd
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Priority to CN201711013162.9A priority Critical patent/CN107790681A/en
Publication of CN107790681A publication Critical patent/CN107790681A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0009—Cylinders, pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0081—Casting in, on, or around objects which form part of the product pretreatment of the insert, e.g. for enhancing the bonding between insert and surrounding cast metal
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/30—Stress-relieving
    • 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
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/10—Cast-iron alloys containing aluminium or 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
    • 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
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/12—Aluminium or alloys based thereon

Abstract

A kind of Engine Cylinder Block ＆ Cylinder Head bimetal composite casting method, belongs to field of alloy preparation technology, including：Cast iron decontamination processing of rust removing, cast iron stress relief annealing process, fluxing agent processing, alloy refining and plus chromium, mould brush thermal insulation coatings, hot dipping plating, casting.Hot-dip aluminizing not only makes Cast Iron Surface form one layer of interphase layer, and one layer of aluminium alloy layer not solidified completely is also stained with its surface, it is easily merged during great waves casting with the aluminium alloy of casting, is formd complete metallurgical binding, is improved the Interface adhesive strength and performance of alloy.

Description

A kind of Engine Cylinder Block ＆ Cylinder Head bimetal composite casting method
Technical field
The invention belongs to field of alloy preparation technology, and in particular to a kind of Engine Cylinder Block ＆ Cylinder Head bimetallic is compound Casting method.
Background technology
Due to can combine the advantage of different materials, the every field in the whole world all plays more composite Carry out more important effect；On the research of composite, the sight of more and more experts and scholar also attract.And bimetallic is answered Founding materials is closed, due to being synthesized using casting method, technique is simple, and cost is cheap, has great application prospect, but pours into a mould During two kinds of metal times of contact it is short, cooling rate is fast, drastically influence the combination of the two, this also turn into restrict bimetallic answer Close the bottleneck of founding materials production and application.Therefore, how to make composite casting that there is good combination and performance, need into one The research of step.
The content of the invention
According to problems of the prior art, the invention provides a kind of Engine Cylinder Block ＆ Cylinder Head to be answered with bimetallic Close casting method, it is intended that improve the Interface adhesive strength and performance of alloy.
The present invention uses following technical scheme：
A kind of Engine Cylinder Block ＆ Cylinder Head bimetal composite casting method, comprises the following steps：
Step 1：Cast iron is polished with sand paper, to remove surface oxide layer, then priority absolute ethyl alcohol and mass concentration 30% watery hydrochloric acid carries out decontamination processing of rust removing in surface to cast iron, then cast iron is placed in into the oxygen sodium oxide molybdena water that mass concentration is 5% 10min is soaked in solution, to remove the greasy dirt on surface, is cleaned cast iron with clear water after decontamination processing, then drying is placed on drying Environment in it is stand-by；
Step 2：Cast iron stress relief annealing process, 500 DEG C -700 DEG C are heated slowly to, room is cooled to after heating 15h-20h Temperature；
Step 3：The aqueous solution from 46%KF containing mass percent and 54%KCl is fluxing agent, and solution concentration is 100g/L, cast iron is immersed in the fluxing agent that temperature is 80 ± 5 DEG C and handles 10min, is then at the uniform velocity taken out, and in 150 ± 5 DEG C of temperature Degree is lower to dry, and carries out the pre-heat treatment to cast iron in 200 DEG C -300 DEG C and be incubated, and preheating temperature is 200 DEG C -300 DEG C；
Step 4：With 12KW crucible electrical resistance furnace smelting aluminium alloy, smelting temperature uses weight percent at 700 DEG C ± 20 DEG C C than 0.6%2Cl6Refining, after standing 20min, the chromium of mass percent 2% is added into aluminium alloy melt, is stirred with graphite Rod stirs, and in 700 DEG C of insulations；
Step 5：Thermal insulation coatings brush will be cast before casting on mould, 500 are preheated in advance using the mould after coating ℃；
Step 6：Cast iron is immersed in aluminium alloy melt and starts or immersion, the hot-dip time is 15min, by heat Cast iron after immersion plating processing is taken out rapidly and fixed in a mold, and casting was completed in 20 seconds；
Step 7：By the sample after the completion of casting in 500 DEG C of solution treatment 4h, then at 200 DEG C of Ageing Treatment 6h.
Preferably, the sand paper described in step 1 is the SiC sand paper of 400 mesh.
Preferably, the casting rate described in step 6 is 1.5kg/s.
Preferably, described aluminium alloy contains the composition of following percentage by weight：Si6.5%-7.5%, Mg0.25%- 0.45%th, Ti0.08%-0.2%, Mn0%-0.1%, surplus Al.
Preferably, described cast iron includes the chemical composition of following percentage by weight：C3.4%-3.6%, Si2.4%- 2.6%th, Mn0.3%-0.6%, S0%-0.02%, P0%-0.07%, surplus Fe.
The beneficial effects of the present invention are：
1) processing intent of Cast Iron Surface hot-dip aluminizing has two, and first is the pre-heat treatment as parent metal, and second Individual is cast iron its wetability raising by pretreatment.Such operation be because when typically being dissolved on the surface of core, Core is easier to realize metallurgical binding with molten metal.Can be the metallurgy at interface because being preheated to core and temperature being higher With reference to the more energy of offer：First, preheating reduces its chilling action to molten metal, maintains the temperature of integral material； Second, core temperature is higher, and the energy that atom has is higher, so as to break away from the enhancing of the ability of metal key constraint, atoms permeating Ability greatly reinforces, the increase of diffusion layer width, and interface bond strength is also higher.Secondly the hot environment that hot-dip aluminizing provides can promote Enter the diffusion of atom, this is more easy to the metallurgical reaction triggered between aluminium/iron and it is just formed an interphase layer (i.e. smelting before casting Golden binder course)；Hot-dip aluminizing not only makes Cast Iron Surface form one layer of interphase layer, and has also been stained with one layer not on its surface The aluminium alloy layer solidified completely, its aluminium alloy easily with casting in casting cycle merge, and form complete metallurgical binding.When Hot dipping key 15min, diffusion is the most abundant, and the transition region of formation is most wide, in 50um or so, effectively increases the interface cohesion of alloy Ability and performance.
2) mould thermal conductivity is good, and temperature is reduced than very fast, therefore by the preferable paint brush of insulation effect before casting after casting On mould.
3) after adding chromium, it will be apparent that promote the diffusion levels of atom, transition region is obvious compared with the sample of non-additional element Broaden, and in the region that is diffused in there occurs long-range of atom and other elements are together with the shape of intermetallic compound or solid solution Formula separates out.
4) solution treatment and Ageing Treatment can significantly facilitate the diffusion of atom, and transition region substantially broadens.
5) fluxing agent is coated on Cast Iron Surface during plating is helped, and forms one layer of uniform salt film；In hot dipping process In, the salt film instant melting on cast iron coupon surface, aluminum melt is soaked rapidly on cast iron coupon surface and metallurgical reaction occurs, most Fluxing agent, which is incorporated in aluminum melt, afterwards forms dregs.
Embodiment
With reference to embodiments, the technical scheme in the present invention is clearly and completely described.Based in the present invention Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all Belong to the scope of protection of the invention.
A kind of Engine Cylinder Block ＆ Cylinder Head bimetal composite casting method, comprises the following steps：
Step 1：Cast iron is polished with sand paper, to remove surface oxide layer, then priority absolute ethyl alcohol and mass concentration 30% watery hydrochloric acid carries out surface decontamination to cast iron and is placed in the oxygen sodium oxide molybdena water that mass concentration is 5% except embroidery is handled, then by cast iron 10min is soaked in solution, to remove the greasy dirt on surface, is cleaned cast iron with clear water after decontamination processing, then drying is placed on drying Environment in it is stand-by；
Step 2：Cast iron stress relief annealing process, 500 DEG C -700 DEG C are heated slowly to, room is cooled to after heating 15h-20h Temperature；
Step 3：The aqueous solution from 46%KF containing mass percent and 54%KCl is fluxing agent, and solution concentration is 100g/L, cast iron is immersed in the fluxing agent that temperature is 80 ± 5 DEG C and handles 10min, is then at the uniform velocity taken out, and in 150 ± 5 DEG C of temperature Degree is lower to dry, and carries out the pre-heat treatment to cast iron in 200 DEG C -300 DEG C and be incubated, and preheating temperature is 200 DEG C -300 DEG C；
Step 4：With 12KW crucible electrical resistance furnace smelting aluminium alloy, smelting temperature uses weight percent at 700 DEG C ± 20 DEG C C than 0.6%2Cl6Refining, after standing 20min, the chromium of mass percent 2% is added into aluminium alloy melt, is stirred with graphite Rod stirs, and in 700 DEG C of insulations；
Step 5：Thermal insulation coatings brush will be cast before casting on mould, 500 are preheated in advance using the mould after coating ℃；
Step 6：Cast iron is immersed in aluminium alloy melt and starts or immersion, the hot-dip time is 15min, by heat Cast iron after immersion plating processing is taken out rapidly and fixed in a mold, and casting was completed in 20 seconds；
Step 7：By the sample after the completion of casting in 500 DEG C of solution treatment 4h, then at 200 DEG C of Ageing Treatment 6h.
Sand paper described in step 1 is the SiC sand paper of 400 mesh.
Casting rate described in step 6 is 1.5kg/s.
Described aluminium alloy contains the composition of following percentage by weight：Si6.5%-7.5%, Mg0.25%-0.45%, Ti0.08%-0.2%, Mn0%-0.1%, surplus Al.
Described cast iron includes the chemical composition of following percentage by weight：C3.4%-3.6%, Si2.4%-2.6%, Mn0.3%-0.6%, S0%-0.02%, P0%-0.07%, surplus Fe.

Claims (5)

1. a kind of Engine Cylinder Block ＆ Cylinder Head bimetal composite casting method, it is characterised in that comprise the following steps：
Step 1：Cast iron is polished with sand paper, to remove surface oxide layer, then priority absolute ethyl alcohol and mass concentration 30% Watery hydrochloric acid to cast iron carry out surface decontamination processing of rust removing, then by cast iron be placed in mass concentration be 5% oxygen aqueous solution of sodium oxide Middle immersion 10min, to remove the greasy dirt on surface, cast iron is cleaned with clear water after decontamination processing, then drying is placed on dry ring It is stand-by in border；
Step 2：Cast iron stress relief annealing process, 500 DEG C -700 DEG C are heated slowly to, room temperature is cooled to after heating 15h-20h；
Step 3：The aqueous solution from 46%KF containing mass percent and 54%KCl is fluxing agent, solution concentration 100g/L, Cast iron is immersed in the fluxing agent that temperature is 80 ± 5 DEG C and handles 10min, is then at the uniform velocity taken out, and dried at a temperature of 150 ± 5 DEG C It is dry, and the pre-heat treatment is carried out to cast iron in 200 DEG C -300 DEG C and is incubated, preheating temperature is 200 DEG C -300 DEG C；
Step 4：With 12KW crucible electrical resistance furnace smelting aluminium alloy, smelting temperature uses percentage by weight at 700 DEG C ± 20 DEG C 0.6% C2Cl6Refining, after standing 20min, the chromium of mass percent 2% is added into aluminium alloy melt, uses graphite stirring rod Stir, and in 700 DEG C of insulations；
Step 5：Thermal insulation coatings brush will be cast before casting on mould, 500 DEG C are preheated in advance using the mould after coating；
Step 6：Cast iron is immersed in aluminium alloy melt and starts or immersion, the hot-dip time is 15min, by hot-dip Cast iron after processing is taken out rapidly and fixed in a mold, and casting was completed in 20 seconds；
Step 7：By the sample after the completion of casting in 500 DEG C of solution treatment 4h, then at 200 DEG C of Ageing Treatment 6h.
2. a kind of Engine Cylinder Block ＆ Cylinder Head bimetal composite casting method according to claim 1, its feature exist In：Sand paper described in step 1 is the SiC sand paper of 400 mesh.
3. a kind of Engine Cylinder Block ＆ Cylinder Head bimetal composite casting method according to claim 1, its feature exist In：Casting rate described in step 6 is 1.5kg/s.
4. a kind of Engine Cylinder Block ＆ Cylinder Head bimetal composite casting method according to claim 1, its feature exist In described aluminium alloy contains the composition of following percentage by weight：Si6.5%-7.5%, Mg0.25%-0.45%, Ti0.08%-0.2%, Mn0%-0.1%, surplus Al.
5. a kind of Engine Cylinder Block ＆ Cylinder Head bimetal composite casting method according to claim 1, its feature exist In described cast iron includes the chemical composition of following percentage by weight：C3.4%-3.6%, Si2.4%-2.6%, Mn0.3%- 0.6%th, S0%-0.02%, P0%-0.07%, surplus Fe.
CN201711013162.9A 2017-10-25 2017-10-25 A kind of Engine Cylinder Block ＆ Cylinder Head bimetal composite casting method Pending CN107790681A (en)

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Publication number Priority date Publication date Assignee Title
CN112355283A (en) * 2020-11-12 2021-02-12 中北大学 Interface active coating for aluminum-steel bimetal liquid-solid composite casting
CN112958758A (en) * 2021-01-29 2021-06-15 湖北长鑫源汽车实业有限公司 Automobile engine end cover casting and manufacturing method thereof
CN113441701A (en) * 2021-07-16 2021-09-28 上海涟屹轴承科技有限公司 Manufacturing method of thick-wall aluminum-based bimetallic bearing and thick-wall aluminum-based bimetallic bearing
CN113528997A (en) * 2021-07-16 2021-10-22 上海涟屹轴承科技有限公司 Plating assistant agent, hot dipping process method and thick-wall aluminum-based bimetallic bearing
CN113547082A (en) * 2021-07-20 2021-10-26 上海电气集团上海电机厂有限公司 Casting method of flame-proof motor fan
CN113927019A (en) * 2021-10-14 2022-01-14 中北大学 Method for forming bimetal by secondary composite casting
CN114231876A (en) * 2021-12-20 2022-03-25 吉林大学 Aluminum alloy cylinder body embedded with gray cast iron cylinder sleeve in secondary hot dipping and casting method thereof

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112355283A (en) * 2020-11-12 2021-02-12 中北大学 Interface active coating for aluminum-steel bimetal liquid-solid composite casting
CN112958758A (en) * 2021-01-29 2021-06-15 湖北长鑫源汽车实业有限公司 Automobile engine end cover casting and manufacturing method thereof
CN113441701A (en) * 2021-07-16 2021-09-28 上海涟屹轴承科技有限公司 Manufacturing method of thick-wall aluminum-based bimetallic bearing and thick-wall aluminum-based bimetallic bearing
CN113528997A (en) * 2021-07-16 2021-10-22 上海涟屹轴承科技有限公司 Plating assistant agent, hot dipping process method and thick-wall aluminum-based bimetallic bearing
CN113528997B (en) * 2021-07-16 2023-05-16 上海涟屹轴承科技有限公司 Plating assistant agent, hot dip plating process method and thick-wall aluminum-based bimetallic bearing
CN113547082A (en) * 2021-07-20 2021-10-26 上海电气集团上海电机厂有限公司 Casting method of flame-proof motor fan
CN113927019A (en) * 2021-10-14 2022-01-14 中北大学 Method for forming bimetal by secondary composite casting
CN114231876A (en) * 2021-12-20 2022-03-25 吉林大学 Aluminum alloy cylinder body embedded with gray cast iron cylinder sleeve in secondary hot dipping and casting method thereof
CN114231876B (en) * 2021-12-20 2023-10-13 吉林大学 Aluminum alloy cylinder body with embedded gray cast iron cylinder sleeve for secondary hot dip plating and casting method thereof

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Application publication date: 20180313