CN108160744A - A kind of preparation method of the high aluminum alloy conduit of inner surface quality - Google Patents
A kind of preparation method of the high aluminum alloy conduit of inner surface quality Download PDFInfo
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- CN108160744A CN108160744A CN201711484792.4A CN201711484792A CN108160744A CN 108160744 A CN108160744 A CN 108160744A CN 201711484792 A CN201711484792 A CN 201711484792A CN 108160744 A CN108160744 A CN 108160744A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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Abstract
The present invention provides a kind of preparation method of the good aluminum alloy conduit of inner surface quality, including：Hollow ingot is heated successively, unlubricated extruding, straightening, erosion are washed, are rolled, tube reducing annealing, drawing and aligning, obtain aluminum alloy conduit；Length≤350mm of hollow ingot in the extrusion process；The length of the extrusion process middle punch needle is 200~850mm.The present invention prepares aluminum alloy conduit method provided by the invention using unlubricated extrusion process under the length of specific pecker and the good aluminum alloy conduit of inner surface quality is obtained in the case where not damaging pecker in ensureing extrusion process.
Description
Technical field
The present invention relates to a kind of preparation sides of the high aluminum alloy conduit of technical field of aluminum alloy technology more particularly to inner surface quality
Method.
Background technology
LF2 alloy thin-wall pipes are widely used in the oil circuit conduit of space shuttle.At present, it is asked existing for LF2 alloy thin-walls pipe
Topic mainly include dimensional accuracy, surface quality (surface wipe scuffing, draw bead, press-in, dent), bend test orange peel (spend by crystal grain
The problems such as greatly) and being flared air seal test gas leakage.
Therefore, it is badly in need of being improved the production technology of LF2 conduits at present, to improve its quality.
Invention content
In view of this, the purpose of the present invention is to provide a kind of preparation method of the high aluminum alloy conduit of inner surface quality,
The higher aluminum alloy conduit of inner surface quality can be prepared in method provided by the invention.
The present invention provides a kind of preparation method of the good aluminum alloy conduit of inner surface quality, including：
Hollow ingot is heated successively, unlubricated extruding, straightening, erosion are washed, are rolled, tube reducing annealing, drawing and aligning, obtain
To aluminum alloy conduit；
Length≤350mm of hollow ingot in the extrusion process；
The length of the extrusion process middle punch needle is 200~850mm.
In the present invention, the preparation method of the hollow ingot is preferably：
Solid ingot is subjected to railway carriage and bore hole, obtains hollow ingot.
In the present invention, the ingredient of the solid ingot is preferably：
The silicon of 0~0.40wt%；
The iron of 0~0.40wt%；
The copper of 0~0.10wt%；
The manganese of 0.15~0.40wt%；
The magnesium of 2.0~2.5wt%；
The titanium of 0~0.15wt%；
The gross mass content of iron and silicon is not more than 0.6%；
Surplus is aluminium.
In the present invention, the mass content of the silicon is preferably 0.15~0.35%, and more preferably 0.2~0.3%；It is described
The mass content of iron is preferably 0.15~0.35%, and more preferably 0.2~0.3%；The mass content of the copper is preferably 0.02
~0.08%, more preferably 0.04~0.06%；The mass content of the manganese is preferably 0.2~0.35%, and more preferably 0.25
~0.3%；The mass content of the magnesium is preferably 2.1~2.4%, and more preferably 2.2~2.3%；The mass content of the titanium
Preferably 0.02~0.12%, more preferably 0.04~0.1%, most preferably 0.06~0.08%.In the present invention, the iron
Total mass content is preferably 0~0.6% with silicon, more preferably 0.2~0.5%, most preferably 0.3~0.4%.
In the present invention, the hollow ingot is to be formed by solid ingot through railway carriage Boring.The present invention is to the railway carriage boring
The method in hole does not have special limitation, is machined i.e. using the method for railway carriage bore hole well known to those skilled in the art
It can.
In the present invention, the hollow ingot outer surface roughness preferably≤Ra12.5, more preferably Ra6.3~12.5,
More preferably Ra3.2~6.3, most preferably Ra1.6~3.2.In the present invention, the outside diameter tolerance of the hollow ingot preferably ±
0.5~± 1.5mm, most preferably more preferably ± 0.8~± 1.2mm, ± 1mm.In the present invention, the internal diameter of the hollow ingot
Deviation is preferably ± 0.5~± 1mm, more preferably ± 0.6~± 0.9mm, most preferably ± 0.7~± 0.8mm.In the present invention
In, the length variation of the hollow ingot is preferably ± 4~± 8mm, most preferably more preferably ± 5~± 7mm, ± 6mm.
In the present invention, the hollow ingot cut gradient preferably≤2mm；The Wall-Thickness Difference of the hollow ingot preferably≤2mm；Institute
The curvature for stating hollow ingot is preferably 0.4~0.6mm.In the present invention, the hollow ingot cut gradient preferably≤1.5mm, more
Preferably 0~1.2mm, more preferably 0.2~1mm, more preferably 0.4~0.8mm, most preferably 0.5~0.6mm.In this hair
In bright, the Wall-Thickness Difference of the hollow ingot preferably≤0.75mm, more preferably 0~0.7mm, more preferably 0.1~0.6mm, it is more excellent
It is selected as 0.2~0.5mm, most preferably 0.3~0.4mm.In the present invention, the curvature of the hollow ingot be preferably 0.4~
0.6mm, more preferably 0.5mm；The curvature refers to the curvature in every 500mm length.
In the present invention, the hollow ingot heating carries out preferably in induction heater, the temperature of the hollow ingot heating
Preferably 450~520 DEG C, more preferably 460~500 DEG C, most preferably 470~490 DEG C.
In the present invention, in the extrusion process hollow ingot length≤350mm, preferably 50~300mm, more preferably
100~250mm, more preferably 150~250mm, most preferably 200mm.In the present invention, the extrusion process middle punch needle
Length is preferably 200~850mm, more preferably 250~800mm, more preferably 300~750mm, more preferably 350~
700mm, more preferably 400~650mm, more preferably 450~600mm, more preferably 500~550mm, most preferably 240mm,
630mm, 730mm or 830mm.
In the present invention, the outer diameter of hollow ingot is preferably 30~32mm in the extrusion process, more preferably 31mm；It is described
The internal diameter of hollow ingot is preferably 24~26mm, more preferably 25mm；The wall thickness of the hollow ingot is preferably 2.5~4mm, more preferably
For 3~3.5mm.In the present invention, the diameter of the extrusion process middle punch needle is preferably 24~26mm, more preferably 25mm.
In the present invention, the aluminum alloy conduit being prepared can be made using the pecker of length described in above-mentioned technical proposal
Wall-Thickness Difference be obviously reduced, further improve the dimensional accuracy for the aluminum alloy conduit being prepared.
In the present invention, the method for the extruding is unlubricated extruding, and the present invention uses length described in above-mentioned technical proposal
Pecker carry out unlubricated extruding, pressing method provided by the invention can avoid making in the case where not damaging pecker
There is the defects of peeling, recess in standby obtained aluminum alloy conduit inner wall, improves the inner surface quality of aluminum alloy conduit.
In the present invention, the extrusion speed in the extrusion process is preferably 1~2.5m/min, more preferably 1.3~
2.2m/min, more preferably 1.5~2m/min, most preferably 1.6~1.8m/min；Extrusion temperature in the extrusion process is excellent
It is selected as 440~460 DEG C, more preferably 445~455 DEG C, most preferably 450 DEG C；Extrusion ratio in the extrusion process is preferably
15~45, more preferably 20~40, more preferably 25~35, most preferably 30.
In the present invention, the bending acting as in elimination extrusion process of the straightening, convenient for follow-up operation of rolling punching
Bar, the extensibility during the straightening are preferably 0.5~2.0%, more preferably 0.8~1.6%, more preferably 1~
1.4%, most preferably 1.2~1.3%.
In the present invention, what the erosion was washed act as slight wiping scuffing, the aluminium skimmings hair that removal pipe woollen extrusion process generates
Thorn etc., the method washed of losing is preferably that soda acid is washed, and the specific method washed that loses is preferably：
The aluminium skimmings inside the aluminium alloy pipe after straightening are blown off with compressed air, successively carry out clear water wash, pickling, cold water
Wash (neutralization chamber), alkali cleaning, cold water are washed (neutralization chamber), pickling and clear water and washed.
It is in the present invention, preferred before the rolling to check whether the catheter blank surfaces externally and internally lost after washing meets the requirements,
If catheter blank has apparent peeling, wipes the defects of scratching, cope with undesirable material and finally concentrate rolling, independent bundling is simultaneously noted
It is bright.There is the pipe woollen of major defect, should choose in time and cut useless processing.In the present invention, it is preferred to it when rolling mode and rolled
The waste material (such as dimension overproof, surfaces externally and internally defect) generated in journey, cuts useless in time, never allows to be mixed into the conjunction normally produced
In lattice material.In the present invention, during the rolling, lubricating oil preferably requires to clean, and must not have the fouls such as sand, metal fragment.Profit
The lubricating oil circulatory system should have intact filter device.
In the present invention, the milling method is preferably two roller cold pilgered pipe methods, the feeding in the operation of rolling
Amount is preferably no greater than 3.0mm, most preferably more preferably 0~3mm, more preferably 0.5~2.5mm, 1~2mm.In the present invention
In, the outer diameter tolerance of the tubing obtained after the rolling is preferably ± 0.5mm~± 1.5mm, and more preferably ± 0.8mm~±
1.2mm, most preferably ± 1mm；The wall thickness tolerance of the tubing obtained after the rolling is preferably ± 0.05mm~± 0.1mm, more
Preferably ± 0.06mm~± 0.08mm, most preferably ± 0.07mm；The average wall thickness tolerance of the tubing obtained after the rolling
Preferably+0.02~-0.01mm, more preferably+0.01~-0.005mm.In the present invention, the tubing obtained after the rolling
The defects of surface is chewed preferably without wiping scuffing, metal or nonmetallic press-in, load mould, crackle, breach, overlap, wave, pass.
In the present invention, the tube reducing annealing can discharge the stress of product after rolling, increase the extension of product after rolling
Property and toughness, convenient for subsequently carrying out drawing.In the present invention, the temperature of the tube reducing annealing is preferably 195~205 DEG C, more excellent
It is selected as 198~202 DEG C, most preferably 200 DEG C；The time of the tube reducing annealing is preferably 0.5~1.5 hour, more preferably 0.8
~1.2 hours, most preferably 1 hour.
In the present invention, the elliptical wave for acting as tube reducing, eliminating the operation of rolling of the drawing, it is accurate control conduit into
Product outer diameter tolerance；The Hubbing method is preferably that sky is drawn, every time sizing reduction is preferably no greater than 3mm in the drawing process, more
Preferably 0.5~2.5mm, more preferably 1~2mm, most preferably 1.5mm.In the present invention, the tubing obtained after the drawing
Surface preferably without road plan, scratch, crackle, peeling, press-in object, it is stupefied son, jump ring, cross vast sky draw section the defects of.In the present invention,
The outer diameter tolerance of tubing after the drawing is preferably controlled in -0.15~0mm, more preferably -0.12~0mm, more preferably -
0.1~0mm, most preferably -0.05~0mm.
In the present invention, it is preferred to drawing at a slow speed, stretch as possible (the especially catheter blank of finished product outer diameter >=50mm, subsequently
Straightening processing will no longer be carried out)；The catheter blank of outer diameter≤12mm, the preferred bundling in drawing process often tie diameter preferably not
More than 100mm.
In the present invention, during the drawing debugging production, if preferably finding, tubing sticking to mould or outer diameter are overproof, should choose in time
Go out.It often to be inspected by random samples in drawing process, underproof material will be chosen during sampling observation, never allow to be mixed into the conjunction normally produced
In lattice material.After expecting to have produced by the gross, underproof material concentration is cut useless.In the present invention, it is preferable to use special during the drawing
It is produced with tool and mould.Conduit drawing tool and mould (including mold, core print etc.) implements concrete management.
In the present invention, the elimination that act as of the aligning is bent.In the present invention, the method for the aligning is preferably roller
(roll straightening) or tension straingtening are rectified, more preferably roller is rectified.Preferred roll straightening roll surface is smooth not damaged in the straightening process,
Nothing has the fouls such as metal fillings.In the present invention, it was discovered that answering timely processing when having foul, viscous metal on roll surface, having damage, roll-type is rectified
Straight complete tube surfaces are preferably bright and clean, without have scuffing, damage, the press-in of load mould, metal, serious spiral trace the defects of, in this hair
In bright, the outside diameter tolerance of tubing, ovality and curvature should meet technical conditions requirement after the aligning.
In the present invention, it after the completion of the aligning, preferably further includes：
Product after aligning is cleaned, is detected and finished products, obtains aluminum alloy conduit.
In the present invention, the lubrication for acting as conduit surfaces externally and internally in cleaning drawing process of the cleaning (finished product is washed)
Oil, the method for the cleaning preferably first carries out hot water wash and then progress kerosene is washed, and the method for the cleaning is preferably：
Before cleaning, the aluminium skimmings in tubing are blown clean with compressed air；Tubing first in hot water is cleaned, is risen up and down
Drop, scavenging period are moderate；After hot water cleaning, tubing is placed in kerosene slot and is cleaned, oscilaltion, tubing surfaces externally and internally greasy dirt
It cleans up, scavenging period is unlimited.
In the present invention, the detection (finished product preliminary examination) act as check catheter outer diameter, wall thickness and surface quality, will not
Certified products select cut it is useless.
In the present invention, the method for the finished products preferably includes following steps：
(1) empty stove constant temperature to 480~500 DEG C after reaching predetermined temperature is kept the temperature, carries out baker；
(2) it is rapid to carry out hot stove charging after baker, complete shove charge；
(3) furnace temperature is set as 430~450 DEG C of heat preservations after shove charge, is made annealing treatment；
(4) it comes out of the stove rapidly, carries out air-cooled after the completion of annealing；
The shove charge is accomplished to the time≤65min to come out of the stove.
Present invention preferably employs the method for the finished products described in above-mentioned technical proposal, this method can ensure to prepare
The Crystallite Sizes On The Surface of aluminum alloy conduit is improved while obtained aluminum alloy conduit performance is met the requirements, aluminum alloy conduit is avoided to exist
In later stage bending process, there is " orange peel " phenomenon in curved surface.Present invention preferably employs above-mentioned high temperature, short time, quick heating coolings
Annealing process, hot stove charging can be such that the metal temperature of tubing is climbed to more than recrystallization temperature, after short time heat preservation, metal
With regard to recrystallization process can be completed.It is quickly cooled down after coming out of the stove, can effectively prevent crystal grain and grow up.Improve heating cooling velocity, Ke Yiyou
Imitate crystal grain thinning.The present invention uses high temperature, short-cycle annealing technique, can inhibit crystal grain coarsening rate, plays the role of crystal grain refinement,
And then flexure plane in the bending process in later stage is avoided to generate " orange peel " phenomenon.
In the present invention, the finished products preferably carry out in 1.5T annealing furnaces.In the present invention, the step (1)
In soaking time be preferably 10~30min, more preferably 15~25min, most preferably 20min；Guarantor in the step (3)
The warm time is preferably 10~30min, more preferably 15~25min, most preferably 20min.In the present invention, the hot stove charging
Preferably close fire door immediately afterwards.In the present invention, the air-cooled method preferably machine that blows in is quickly cooled down.
In the present invention, the highly preferred of annealing charging basket is 200mm~350mm during the finished products；More preferably
For 250~300mm；The batch of the annealing charging basket is preferably the conduit of outer diameter ＞ Ф 20mm, can fill basket；Ф20mm≥
The conduit of outer diameter ＞ Ф 10mm, every basket of work loading height are preferably more than half basket；The conduit of outer diameter≤Ф 10mm, every basket of charging
It is highly preferred to be no more than 100mm.The present invention is preferably evenly laid out by tubing when filling basket.Using the above-mentioned annealing charging basket of the present invention
And batch can ensure well-ventilated, make annealing more abundant.
Compared with prior art, the present invention prepares aluminium using unlubricated extrusion process under the length of specific pecker and closes
Golden conduit, it is good that method provided by the invention obtains inner surface quality in the case where not damaging pecker in ensureing extrusion process
Good aluminum alloy conduit.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention, for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the inner surface picture of aluminum alloy conduit that the embodiment of the present invention 1 is prepared；
Fig. 2 is the inner surface picture of aluminum alloy conduit that comparative example 1 of the present invention is prepared.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
Embodiment 1
Solid ingot is subjected to railway carriage and bore hole, obtains hollow ingot；The ingredient of the solid ingot is：The silicon of 0.06wt%；
The iron of 0.16wt%；The copper of 0.02wt%；The manganese of 0.31wt%；The magnesium of 2.48wt%；The titanium of 0.01wt%；Total matter of iron and silicon
Measure content 0.22%；Surplus is aluminium.
The hollow ingot cuts gradient as 1.6mm；The Wall-Thickness Difference of the hollow ingot is 1.7mm；The bending of the hollow ingot
It spends for 0.5mm；The outside diameter tolerance of the hollow ingot is+1mm；The inner diameter deviation of the hollow ingot is -0.5mm；The hollow ingot
Length variation be -6mm；Outer surface roughness≤Ra12.5 of the hollow ingot, inside surface roughness≤Ra6.3.
The hollow ingot on the extruder after 480 DEG C of heating in 2500T is squeezed, obtains catheter blank；The extruding
For unlubricated extruding, the length of the pecker in the extrusion process is 730mm；The length of hollow ingot is in the extrusion process
300mm, the internal diameter of hollow ingot is 80mm, outer diameter 88mm, thickness 8mm；Extrusion speed in the extrusion process is 2m/
Min, extrusion temperature are 450 DEG C, extrusion ratio 33.42.
The catheter blank obtained after extruding is subjected to straightening, the extensibility during the straightening is 1.5%；
Product after straightening is carried out erosion to wash, the method washed of losing is：
The aluminium skimmings inside the tubing after straightening are blown off with compressed air, carry out successively clear water wash, pickling, cold water wash (in
And slot), alkali cleaning, cold water washes (neutralization chamber), pickling and clear water and washes.
By lose wash after product roll, the milling method be two roller cold pilgered pipe methods, the operation of rolling
In feeding amount be 2.0mm；The outer diameter tolerance of the tubing obtained after the rolling is+1mm；The tubing obtained after the rolling
Wall thickness tolerance is -0.07mm；The average wall thickness tolerance of the tubing obtained after the rolling is+0.02mm.
Product after rolling is subjected to tube reducing annealing, the temperature of tube reducing annealing is 200 DEG C, the tube reducing annealing when
Between be 1 hour.
Product after tube reducing is annealed carries out drawing, and the method for the drawing is drawn to be empty, it is described it is empty draw during every time
Sizing reduction is 2mm.
Product after drawing is aligned, obtains aluminum alloy conduit；The method of the aligning is roll straightening.
Embodiment 2
Aluminum alloy conduit is prepared in method according to embodiment 1；Difference lies in the extruding of 600T with embodiment 1
It is squeezed on machine, the length of pecker is 240mm；The length of hollow ingot is 200mm in the extrusion process, and the internal diameter of hollow ingot is
25mm, outer diameter 31mm, thickness 3mm.
Embodiment 3
Aluminum alloy conduit is prepared in method according to embodiment 1；Difference lies in the temperature of heating is with embodiment 1
430℃
Embodiment 4
Aluminum alloy conduit is prepared in method according to embodiment 1；Difference lies in the temperature of heating is with embodiment 1
540℃。
Embodiment 5
Aluminum alloy conduit is prepared in method according to embodiment 1；Difference lies in the extrusion processes with embodiment 1
In extrusion speed be 0.5m/min.
Embodiment 6
Aluminum alloy conduit is prepared in method according to embodiment 1；Difference lies in the extrusion processes with embodiment 1
In extrusion speed be 3m/min.
Comparative example 1
Aluminum alloy conduit is prepared in method according to embodiment 1；With embodiment 1 difference lies in during, extruding using containing
The lubricating oil for having graphite powder smears pecker, and the length of pecker is 1030mm.
Comparative example 2
Aluminum alloy conduit is prepared in method according to embodiment 2；Difference lies in peckers during, extruding with embodiment 2
Length be 280mm.
Embodiment 7
The conduit that the embodiment of the present invention and comparative example are prepared is carried out to cut open pipe range estimation, detects the embodiment of the present invention and ratio
Compared with the inner surface quality for the aluminum alloy conduit that example is prepared, testing result is, in the aluminum alloy conduit that embodiment 1 is prepared
Surface smooth clean, without peeling, pit the defects of (such as Fig. 1), aluminum alloy conduit inner surface that embodiment 2 is prepared is smooth clear
The defects of clean, without peeling, pit, aluminum alloy conduit inner surface smooth clean that embodiment 3 is prepared have slight peeling, are recessed
The defects of hole, aluminum alloy conduit inner surface smooth clean that embodiment 4 is prepared have the defects of slight peeling, pit, implement
The relatively smooth cleaning of aluminum alloy conduit inner surface that example 5 is prepared, without peeling, pit the defects of, what embodiment 6 was prepared
Aluminum alloy conduit inner surface it is relatively smooth cleaning, without peeling, pit the defects of, the aluminium alloy that the embodiment of the present invention is prepared is led
Pipe internal surface without or have slight peeling, a pit defect.There is peeling, pit in aluminum alloy conduit inner wall prepared by comparative example 1
The defects of (as shown in Figure 2), 2 preparation process middle punch needle fracture of root of comparative example, needle point draw and attenuate, can not continue to produce.
Embodiment 8
Solid ingot is subjected to railway carriage and bore hole, obtains hollow ingot；The ingredient of the solid ingot is：The silicon of 0.06wt%；
The iron of 0.15wt%；The copper of 0.02wt%；The manganese of 0.26wt%；The magnesium of 2.49wt%；The titanium of 0.02wt%；Iron and silicon it is total
Mass content is 0.24%；Surplus is aluminium.
The hollow ingot cuts gradient as 1.7mm；The Wall-Thickness Difference of the hollow ingot is 1.8mm；The bending of the hollow ingot
It spends for 0.5mm；The outside diameter tolerance of the hollow ingot is -1mm；The inner diameter deviation of the hollow ingot is+0.5mm；The hollow ingot
Length variation be+6mm；Outer surface roughness≤Ra12.5 of the hollow ingot, inside surface roughness≤Ra6.3.
The hollow ingot on the extruder after 490 DEG C of heating in 2500T is squeezed, obtains catheter blank；The extruding
For unlubricated extruding, the length of the pecker in the extrusion process is 730mm；The length of hollow ingot is in the extrusion process
300mm, the internal diameter of hollow ingot is 80mm, outer diameter 88mm, thickness 4mm；Extrusion speed in the extrusion process is 2m/
Min, extrusion temperature are 455 DEG C, extrusion ratio 26.31.
The catheter blank obtained after extruding is subjected to straightening, the extensibility during the straightening is 1.7%；
Product after straightening is carried out erosion to wash, the specific method washed that loses is：
The aluminium skimmings inside the aluminium alloy pipe after straightening are blown off with compressed air, successively carry out clear water wash, pickling, cold water
Wash (neutralization chamber), alkali cleaning, cold water are washed (neutralization chamber), pickling and clear water and washed.
By lose wash after product roll, the milling method be two roller cold pilgered pipe methods, the operation of rolling
In feeding amount for 3.0mm, the outer diameter tolerance of the tubing obtained after the rolling is -1mm；The tubing obtained after the rolling
Wall thickness tolerance is+0.07mm；The average wall thickness tolerance of the tubing obtained after the rolling is -0.01.
Product after rolling is subjected to tube reducing annealing, the temperature of tube reducing annealing is 202 DEG C, the tube reducing annealing when
Between be 1 hour.
Product after tube reducing is annealed carries out drawing, and the method for the drawing is drawn to be empty, it is described it is empty draw during every time
Sizing reduction be 2mm.
Product after drawing is aligned, the method for the aligning is roll straightening.
Product after aligning is cleaned, the method for the cleaning is：
Before cleaning, the aluminium skimmings in tubing are blown clean with compressed air；Tubing first in hot water is cleaned, is risen up and down
Drop, scavenging period are moderate；After hot water cleaning, tubing is placed in kerosene slot and is cleaned, oscilaltion, tubing surfaces externally and internally greasy dirt
It cleans up, scavenging period is unlimited.
Product after cleaning is carried out to the detection of outer diameter, wall thickness and surface quality；
Qualified product will be detected and carry out finished products, obtain aluminum alloy conduit；The method of the finished products is：
Carried out in 1.5T annealing furnaces, empty 480~490 DEG C of stove constant temperature, to temperature after keep the temperature 30min；After baker, rapidly
Hot stove feeds；Fire door is closed after charging immediately, furnace temperature, which changes, is set as 430~440 DEG C, to temperature after keep the temperature 10min, from closing
Fire door terminates whole no more than 65min to heat preservation.It after heat preservation, comes out of the stove rapidly, and the machine that blows in is quickly cooled down.
Using outside micrometer and wall thickness micrometer gauge, the ruler of aluminum alloy conduit that the embodiment of the present invention 8 is prepared is detected
Very little precision, testing result be, the outside diameter tolerance of the aluminum alloy conduit that the embodiment of the present invention 8 is prepared is -0.07mm, Wall-Thickness Difference
For ± 0.08mm.
The interior table of aluminum alloy conduit being prepared according to the method detection embodiment of the present invention 8 described in above-mentioned technical proposal
Face quality, testing result are that the aluminum alloy conduit inner surface that the embodiment of the present invention 8 is prepared is without peeling, pit defect.
According to GB/T228《Metal material tensile testing at ambient temperature》、GB/T3246.2《It deforms aluminium and Al-alloy products is low
Times histological test method》Standard, the tensile strength and surface microstructure of aluminum alloy conduit that the detection embodiment of the present invention 8 is prepared
Degree, testing result are that tensile strength is 220~230MPa, and grain size is 1 grade.The aluminium alloy that the embodiment of the present invention 8 is prepared
Catheter surface grain size is smaller, and curved surface is without " orange peel " phenomenon in later stage bending process.
As seen from the above embodiment, the present invention provides a kind of preparation method of the good aluminum alloy conduit of inner surface quality,
Including：Hollow ingot is heated successively, unlubricated extruding, straightening, erosion are washed, are rolled, tube reducing annealing, drawing and aligning, obtain
Aluminum alloy conduit；Length≤350mm of hollow ingot in the extrusion process；The length of the extrusion process middle punch needle is 200
~850mm.The present invention prepares aluminum alloy conduit under the length of specific pecker using unlubricated extrusion process, and the present invention carries
The method of confession obtains the good aluminum alloy conduit of inner surface quality in the case where not damaging pecker in ensureing extrusion process.
Claims (10)
1. a kind of preparation method of the good aluminum alloy conduit of inner surface quality, including：
Hollow ingot is heated successively, unlubricated extruding, straightening, erosion are washed, are rolled, tube reducing annealing, drawing and aligning, obtain aluminium
Alloy conduit；
Length≤350mm of hollow ingot in the extrusion process；
The length of the extrusion process middle punch needle is 200~850mm.
2. according to the method described in claim 1, it is characterized in that, the length of the extrusion process middle punch needle for 240mm,
630mm, 730mm or 830mm.
3. according to the method described in claim 1, it is characterized in that, in the extrusion process outer diameter of hollow ingot for 30~
32mm；Internal diameter is 24~26mm, and wall thickness is 3.5~4.5mm.
4. according to the method described in claim 1, it is characterized in that, the extrusion speed in the extrusion process is 1~2.5m/
min。
5. according to the method described in claim 1, it is characterized in that, extrusion temperature is 440~460 DEG C in the extrusion process.
6. according to the method described in claim 1, it is characterized in that, the extrusion ratio in the extrusion process is 15~45.
7. according to the method described in claim 1, it is characterized in that, the hollow ingot cuts gradient≤2mm；The hollow ingot
Wall-Thickness Difference≤2mm；The curvature of the hollow ingot is 0.45~0.55mm.
8. according to the method described in claim 1, it is characterized in that, the temperature of the heating is 450~520 DEG C.
9. according to the method described in claim 1, it is characterized in that, the temperature of tube reducing annealing is 195~205 DEG C；It is described
The time of tube reducing annealing is 0.5~1.5 hour.
10. according to the method described in claim 1, it is characterized in that, after the completion of the aligning, further include：
Product after aligning is cleaned, is detected and finished products, obtains aluminum alloy conduit.
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| CN113649427A (en) * | 2021-08-25 | 2021-11-16 | 西南铝业（集团）有限责任公司 | 6061 aluminum alloy thin-wall pipe forming process |
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