CN105945081A - Isothermal extrusion process based on temperature segmented control - Google Patents

Isothermal extrusion process based on temperature segmented control Download PDF

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Publication number
CN105945081A
CN105945081A CN201610338644.0A CN201610338644A CN105945081A CN 105945081 A CN105945081 A CN 105945081A CN 201610338644 A CN201610338644 A CN 201610338644A CN 105945081 A CN105945081 A CN 105945081A
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CN
China
Prior art keywords
temperature
extrusion
controls
isothermal
casting rod
Prior art date
Application number
CN201610338644.0A
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Chinese (zh)
Inventor
张奇
Original Assignee
淮安和通汽车零部件有限公司
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Priority to CN201610338644.0A priority Critical patent/CN105945081A/en
Publication of CN105945081A publication Critical patent/CN105945081A/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00Extruding metal; Impact extrusion
    • B21C23/02Making uncoated products
    • B21C23/04Making uncoated products by direct extrusion
    • B21C23/14Making other products
    • B21C23/142Making profiles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C29/00Cooling or heating work or parts of the extrusion press; Gas treatment of work
    • B21C29/003Cooling or heating of work
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C31/00Control devices, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses

Abstract

The invention relates to an isothermal extrusion process based on temperature segmented control and belongs to the technical field of metallurgy. The isothermal extrusion process based on temperature segmented control mainly comprises cast rod heating, on-line hot peeling and extrusion, wherein gradient heating is adopted for cast rod heating, the temperature of the head of a cast rod ranges from 460 DEG C to 480 DEG C, and the temperature difference of the head and the tail ranges from 10 DEG C to 50 DEG C. According to the isothermal extrusion process, gradient heating is adopted, and the temperature difference of the head and the tail of the cast rod is controlled so that the temperature of the heated aluminum alloy cast rod can decrease gradually from the head to the tail along the axis temperature to form the temperature gradient, so that isothermal extrusion is achieved, and the quality of an extruded profile is guaranteed. Furthermore, online automatic hot peeling is conducted after the aluminum alloy cast rod is heated, a surface oxide layer of the aluminum alloy cast rod is removed, aluminum pickup, extrusion marks and mold lines are reduced, the size of the end face is stabilized, the surface quality of the extruded profile is improved, and the yield of the extruded profile is increased.

Description

The isothermal extrusion technology that temperature section controls
Technical field
The present invention relates to a kind of isothermal extrusion technology, particularly relate to a kind of temperature section and control Isothermal extrusion technology, belong to metallurgical technology field.
Background technology
Aluminum alloy extrusion section bar is with its light weight, high-strength, excellent processing characteristics, weldability Can and surface treatment properties, and the characteristic such as reusable edible, be widely used in aviation, The fields such as space flight, naval vessel, automobile, become developing national economy and improve the life of people's material Live and the important foundation material of the level of cultural life, social required quantity sustainable growth.And with The the most perfect of expanding economy and technology, technique, matter to aluminum alloy extrusion section bar The requirement of the aspects such as amount, stability, production capacity is more and more higher.
At present, along with developing rapidly of aluminum extrusion industry and technology, occur in that tongue pattern squeezes Pressure, the extruding of set of planes matched moulds, big cross section extruding, water cooled mo(u)ld extruding, flat extruding, spread Extruding, accurate gas and water (mist) cooling press quenching extruding, efficient reversed extruding, etc. The technology such as Warm Extrusion.Expand the kind of aluminium, improve extrusion speed, production efficiency With product quality and stability.
Wherein, Isothermal Extrusion technology is a kind of pressing method more commonly used, and generally has two Planting implementation, one is by the temperature controlled method of aluminium bar, and one is by extruding The method that rate curve controls.Such as Chinese invention patent (publication number: CN103100575A) It is disclosed that the equi-temperature extrusion method of a kind of speed Discrete control, but, this by squeezing The method that pressure rate curve controls, owing to aluminium alloy cast rod is in extrusion process, extruding is held Relative motion between room and aluminium alloy cast rod creates frictional heat, if aluminium alloy cast rod The temperature entering extruding room is the most constant, and in extrusion process, extrusion speed keeps Constant, aluminium alloy cast rod back material experienced by the friction process of longer path, enters Temperature during deformed region has built up, thus causes aluminium alloy extruded type at front end exit Material temperature and mechanical property change along its length.
Summary of the invention
It is an object of the invention to for the above-mentioned problems in the prior art, it is proposed that one The Isothermal Extrusion that the temperature section that kind surface of extruded profiles good quality, yield rate are high controls Technique.
The purpose of the present invention can be realized by following technical proposal: temperature section controls Isothermal extrusion technology, described isothermal extrusion technology mainly includes casting rod heating, online hot soarfing Skin and extruding;
Wherein, the heating of described casting rod uses gradient-heated, and casting rod head temperature is 460-480 DEG C, head, the afterbody temperature difference are between 10-50 DEG C.
The present invention uses the isothermal extrusion technology that temperature section controls, to aluminium alloy before extruding Casting rod use gradient-heated, control aluminum alloy cast caput, afterbody the temperature difference in controlled range In, so that the aluminium alloy cast rod heated gradually drops along axis temperature from head to afterbody Low, form thermograde.Because the extruding heat that aluminium alloy cast rod produces when extruding can To gradually step up the temperature at aluminium alloy cast rod rear portion, aluminum alloy cast when making entrance deformed region The temperature of rod keeps constant, thus realizes Isothermal Extrusion, it is ensured that the quality of extrudate.
Additionally, in order to reduce viscous aluminum, extruding trace, loft, stablize the extruding such as face size The quality of section bar, the present invention carries out on-line automatic hot soarfing skin after aluminium alloy cast rod heats, Remove the surface oxide layer of aluminium alloy cast rod.Because, the aluminum alloy cast that extrudate uses Rod, is to produce by the method for semi-continuous casting.Its surface also exist stratification, drawing crack, The defects such as cold shut, component segregation, pile displacement, if these Defect removals are not fallen, gesture Surface quality and the inherent quality of goods must be affected.And, aluminium alloy cast rod of the present invention exists Being directly entered recipient after line hot soarfing skin to extrude, casting rod clean surface, oxide layer is very Thin, do not interfere with the quality of goods.But, add if first casting rod being carried out surface turning Work, then carries out after gradient-heated, extruding, or gradient-heated to the surface of casting rod not Processing, the thicker oxide layer in aluminium alloy cast rod surface will certainly affect the quality of goods. Because the oxide of aluminum is for parent metal, the most brittle and hard.During plastic deformation Under powerful shear stress easily broken, broken after oxide layer there is abrasive material Character, not only strengthens friction, and is pressed into product surface, forms Hard Inclusion, is squeezing In pressure drawing process, these Hard Inclusion can destroy metallic continuity, causes strip to abrade.
The method removing aluminium alloy cast rod surface defect and oxide layer in traditional handicraft is typically adopted Carrying out machining with lathe, this method not only workload is big, and production efficiency is low, and And producing a large amount of chip, these chip surface are long-pending big, and when remelt, burn out rate is left 10% The right side, oxidization burning loss is serious, causes the waste of a large amount of metals resources.And what the present invention used On-line automatic hot soarfing skin technomania peeling thickness is thin, and in bulk, surface area is little, and remelt burns Loss rate, about 3%, can save a large amount of metals resources.And, traditional turning adds Man-hour requirement uses emulsion cooling and lubrication, can produce substantial amounts of harmful gas when remelt, And the online hot soarfing skin technology of the present invention is without using cooling and lubricant, when remelt certainly So also will not produce harmful gas.
In the isothermal extrusion technology that above-mentioned temperature section controls, described casting rod tail temperature For 430-450 DEG C.
In the isothermal extrusion technology that above-mentioned temperature section controls, described casting rod uses electromagnetism Heating system carries out gradient-heated.The present invention uses electromagnetic induction heating system sensing to add During heat can realize gradient-heated, the accurate of temperature controls, and firing rate is fast, environmental protection Pollution-free, it is simple to operation, safe and reliable.
In the isothermal extrusion technology that above-mentioned temperature section controls, described online hot soarfing skin Thickness is 2-5mm, removes aluminium alloy cast rod surface defect and oxide layer.
In the isothermal extrusion technology that above-mentioned temperature section controls, described online hot soarfing skin Speed is 20-50mm/s.Owing to casting rod gradient-heated back, afterbody exist thermograde, Resistance of deformation and elastic deformation are different, so the speed controlling of online hot soarfing skin is to hot soarfing skin The precision controlling of thickness have certain impact.The speed of the present invention further preferred hot soarfing skin is first Slowing down after Di Zenging, head initial velocity is 25-35mm/s, middle part maximum speed is 40-50mm/s, tail speed are 20-25mm/s.
In the isothermal extrusion technology that above-mentioned temperature section controls, described in be squeezed in extruder Recipient in carry out, through extrusion die extrusion obtain extrudate, recipient temperature is 410-430 DEG C, extrusion die temperature is 460-470 DEG C, and pressure ram fltting speed is 4.0-5.0mm/s, extruding outlet temperature is 500-550 DEG C.
In the isothermal extrusion technology that above-mentioned temperature section controls, described extruding outlet temperature Degree is for 520-540 DEG C.
In extrusion process, extruding outlet temperature (i.e. maximum temperature) is most important in extrusion process A parameter, which determine the success or failure of extrusion process, and the group of section bar that extruding obtains Knit performance the most uniform, stable.And extrude outlet temperature and depend on the temperature of recipient, squeeze The composite factors such as the temperature of compression mould, extrusion speed.Therefore, the present invention is limited by comprehensive The temperature of recipient, the temperature of extrusion die and extrusion speed, control extruding outlet temperature At 500-550 DEG C, so that extruding the structure property of the section bar obtained evenly, stably, Ensure the surface quality of the extrudate obtained, improve extrusion yield.
As preferably, present invention extruding i.e. carry out after obtaining extrudate press quenching, aligning, The techniques such as timeliness.
Compared with prior art, the method have the advantages that
1. the present invention uses the isothermal extrusion technology that temperature section controls, it is ensured that extrudate Quality.
Casting rod the most of the present invention uses gradient-heated, and controls the head of casting rod, the afterbody temperature difference, Thus realize Isothermal Extrusion.
Carry out online atural beat peeling after aluminium alloy cast rod gradient-heated the most of the present invention, remove Surface defect and oxide layer, improve surface quality and the yield rate of extrudate.
4. the on-line automatic hot soarfing skin technomania peeling thickness that the present invention uses is thin, in bulk, Surface area is little, and remelt burn out rate, about 3%, can save a large amount of metals resources;And And, harmful gas will not be produced during remelt.
Detailed description of the invention
The following is the specific embodiment of the present invention, technical scheme is made further Describe, but the present invention is not limited to these embodiments.
Embodiment 1:
Casting rod uses electromagnetic induction heating system carry out gradient-heated, controls casting rod head temperature Degree is 480 DEG C, and casting rod tail temperature is 430 DEG C.Then the casting rod after heating is sent into heat Peeling machine carries out on-line automatic hot soarfing skin, and head initial velocity is 25mm/s, middle part is the highest Speed is 40mm/s, tail speed is 20mm/s, and the thickness of hot soarfing skin is 2mm.Heat After peeling, casting rod is sent in recipient and extrude, extruded through extrusion die Section bar, the extrusion die temperature of extruder is 460 DEG C, and recipient temperature is 410 DEG C, squeezes Depression bar fltting speed is 4.0mm/s, and extruding outlet temperature is 500 DEG C.Extruded End article is obtained through techniques such as press quenching, aligning, timeliness after section bar, wherein, Line quenching outlet temperature≤200 DEG C, quench intensity of cooling >=7 DEG C/s, the stretching of straightening processing A length of 1-2%.Being detected by goods, the surface quality of goods is relatively and stability Preferably, yield rate reaches more than 83%.
Embodiment 2:
Casting rod uses electromagnetic induction heating system carry out gradient-heated, controls casting rod head temperature Degree is 470 DEG C, and casting rod tail temperature is 440 DEG C.Then the casting rod after heating is sent into hot soarfing Skin machine carries out on-line automatic hot soarfing skin, and head initial velocity is 28mm/s, middle part high speed Degree is 22mm/s for 45mm/s, tail speed, and the thickness of hot soarfing skin is 3mm.Hot soarfing skin After casting rod sent in recipient extrude, obtain extrusion pressing type through extrusion die extrusion Material, the extrusion die temperature of extruder is 465 DEG C, and recipient temperature is 415 DEG C, pressure ram Fltting speed is 4.0mm/s, and extruding outlet temperature is 520 DEG C.After extruding obtains extrudate End article is obtained through techniques such as press quenching, aligning, timeliness, wherein, press quenching Outlet temperature≤200 DEG C, quench intensity of cooling >=7 DEG C/s, and the tensile elongation of straightening processing is 1-2%.Being detected by goods, the surface quality of goods is relatively and stability is preferable, Yield rate reaches more than 85%.
Embodiment 3:
Casting rod uses electromagnetic induction heating system carry out gradient-heated, controls casting rod head temperature Degree is 475 DEG C, and casting rod tail temperature is 450 DEG C.Then the casting rod after heating is sent into hot soarfing Skin machine carries out on-line automatic hot soarfing skin, and head initial velocity is 30mm/s, middle part high speed Degree is 23mm/s for 46mm/s, tail speed, and the thickness of hot soarfing skin is 4mm.Hot soarfing skin After casting rod sent in recipient extrude, obtain extrusion pressing type through extrusion die extrusion Material, the extrusion die temperature of extruder is 465 DEG C, and recipient temperature is 420 DEG C, pressure ram Fltting speed is 4.5mm/s, and extruding outlet temperature is 540 DEG C.After extruding obtains extrudate End article is obtained through techniques such as press quenching, aligning, timeliness, wherein, press quenching Outlet temperature≤200 DEG C, quench intensity of cooling >=7 DEG C/s, and the tensile elongation of straightening processing is 1-2%.Being detected by goods, the surface quality of goods is relatively and stability is preferable, Yield rate reaches more than 83%.
Embodiment 4:
Casting rod uses electromagnetic induction heating system carry out gradient-heated, controls casting rod head temperature Degree is 460 DEG C, and casting rod tail temperature is 450 DEG C.Then the casting rod after heating is sent into hot soarfing Skin machine carries out on-line automatic hot soarfing skin, and head initial velocity is 35mm/s, middle part high speed Degree is 25mm/s for 50mm/s, tail speed, and the thickness of hot soarfing skin is 5mm.Hot soarfing skin After casting rod sent in recipient extrude, obtain extrusion pressing type through extrusion die extrusion Material, the extrusion die temperature of extruder is 470 DEG C, and recipient temperature is 430 DEG C, pressure ram Fltting speed is 5.0mm/s, and extruding outlet temperature is 550 DEG C.After extruding obtains extrudate End article is obtained through techniques such as press quenching, aligning, timeliness, wherein, press quenching Outlet temperature≤200 DEG C, quench intensity of cooling >=7 DEG C/s, and the tensile elongation of straightening processing is 1-2%.Being detected by goods, the surface quality of goods is relatively and stability is preferable, Yield rate reaches more than 83%.
Comparative example 1:
Comparative example 1 differs only in embodiment 2, and the casting rod of comparative example 1 is not carried out Line hot soarfing skin.Being detected by the goods of comparative example 1, there are viscous aluminum, extruding in the surface of goods The defects such as horizontal stroke, loft, surface quality is poor, unstable properties, yield rate only about 75%.
Comparative example 2:
Comparative example 2 differs only in embodiment 2, and the casting rod of comparative example 2 uses use Traditional lathe carries out machining, casting rod surface railway carriage 2mm, then carries out gradient-heated And extrude.Owing to carrying out gradient-heated after the railway carriage of casting rod surface, casting rod surface still suffers from oxygen Changing layer generating layer, so being detected by the goods of comparative example 2, the surface of goods has strip Scratch, yield rate only has 63%.
Specific embodiment described herein is only to present invention spirit explanation for example. Described specific embodiment can be done respectively by those skilled in the art Plant amendment or supplement or use similar mode to substitute, but without departing from the spirit of the present invention Or surmount scope defined in appended claims.
Although the present invention having been made a detailed description and having quoted some specific embodiments as proof, But to those skilled in the art, as long as without departing from the spirit and scope of the present invention It is obvious for can making various changes or revise.

Claims (7)

1. the isothermal extrusion technology that temperature section controls, it is characterised in that described warm extrusion such as grade Pressure technique mainly includes casting rod heating, online hot soarfing skin and extruding;
Wherein, the heating of described casting rod uses gradient-heated, and casting rod head temperature is 460-480 DEG C, head, the afterbody temperature difference are between 10-50 DEG C.
The isothermal extrusion technology that temperature section the most according to claim 1 controls, it is special Levying and be, described casting rod tail temperature is 430-450 DEG C.
The isothermal extrusion technology that temperature section the most according to claim 1 controls, it is special Levying and be, described casting rod uses electromagnetic induction heating system to carry out gradient-heated.
The isothermal extrusion technology that temperature section the most according to claim 1 controls, it is special Levying and be, the thickness of described online hot soarfing skin is 2-5mm.
The isothermal extrusion technology that temperature section the most according to claim 1 controls, it is special Levying and be, the speed of described online hot soarfing skin is 20-50mm/s.
The isothermal extrusion technology that temperature section the most according to claim 1 controls, it is special Levy and be, described in be squeezed in the recipient of extruder and carry out, extrude through extrusion die To extrudate, recipient temperature is 410-430 DEG C, and extrusion die temperature is 460-470 DEG C, Pressure ram fltting speed is 4.0-5.0mm/s, and extruding outlet temperature is 500-550 DEG C.
The isothermal extrusion technology that temperature section the most according to claim 6 controls, it is special Levying and be, described extruding outlet temperature is 520-540 DEG C.
CN201610338644.0A 2016-05-20 2016-05-20 Isothermal extrusion process based on temperature segmented control CN105945081A (en)

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
CN107185990A (en) * 2017-04-25 2017-09-22 苏州罗普斯金铝业股份有限公司 A kind of isothermal extrusion technology of section bar
CN107282669A (en) * 2017-07-11 2017-10-24 辽宁忠旺集团有限公司 A kind of high-strength bar on-line extruding production technologies of 7A04
CN107282668A (en) * 2017-07-11 2017-10-24 辽宁忠旺集团有限公司 A kind of big wide cut LF6 aluminum alloy strips gusset extruding production technology
CN108817121A (en) * 2018-05-30 2018-11-16 慈溪市宜美佳铝业有限公司 A kind of constant temperature high-speed extrusion liquid nitrogen cooling device and cooling technique
CN110055478A (en) * 2019-05-10 2019-07-26 贵州正合可来金科技有限责任公司 A kind of manufacture craft of aluminium alloy
CN110976543A (en) * 2019-12-16 2020-04-10 广东和胜工业铝材股份有限公司 Sectional-speed extrusion process of aluminum alloy

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CN104550288A (en) * 2014-12-26 2015-04-29 辽宁忠旺集团有限公司 High-silicon aluminum alloy seamless tube extrusion process
CN105149372A (en) * 2015-09-30 2015-12-16 核兴航材(天津)科技有限公司 Manufacturing process of asymmetric seamless hollow profile

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107185990A (en) * 2017-04-25 2017-09-22 苏州罗普斯金铝业股份有限公司 A kind of isothermal extrusion technology of section bar
CN107282669A (en) * 2017-07-11 2017-10-24 辽宁忠旺集团有限公司 A kind of high-strength bar on-line extruding production technologies of 7A04
CN107282668A (en) * 2017-07-11 2017-10-24 辽宁忠旺集团有限公司 A kind of big wide cut LF6 aluminum alloy strips gusset extruding production technology
CN107282668B (en) * 2017-07-11 2018-11-23 辽宁忠旺集团有限公司 A kind of big wide cut LF6 aluminum alloy strip gusset extruding production technology
CN108817121A (en) * 2018-05-30 2018-11-16 慈溪市宜美佳铝业有限公司 A kind of constant temperature high-speed extrusion liquid nitrogen cooling device and cooling technique
CN108817121B (en) * 2018-05-30 2021-03-23 慈溪市宜美佳铝业有限公司 Constant-temperature high-speed extrusion liquid nitrogen cooling device and cooling process
CN110055478A (en) * 2019-05-10 2019-07-26 贵州正合可来金科技有限责任公司 A kind of manufacture craft of aluminium alloy
CN110976543A (en) * 2019-12-16 2020-04-10 广东和胜工业铝材股份有限公司 Sectional-speed extrusion process of aluminum alloy

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Application publication date: 20160921