CN107739908A - The manufacture method of automobile gas spring novel aluminum alloy circular tube - Google Patents

The manufacture method of automobile gas spring novel aluminum alloy circular tube Download PDF

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Publication number
CN107739908A
CN107739908A CN201710800473.3A CN201710800473A CN107739908A CN 107739908 A CN107739908 A CN 107739908A CN 201710800473 A CN201710800473 A CN 201710800473A CN 107739908 A CN107739908 A CN 107739908A
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product
gas spring
aluminum alloy
circular tube
novel aluminum
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CN107739908B (en
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时勇
胡祥树
时永皓
李勇
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Ma'anshan Xinma Precision Aluminum Industry Co ltd
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CYMA PRECISION ALUMINUM Co Ltd
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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
    • 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
    • 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
    • C22F1/043—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 silicon as the next major constituent
    • 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
    • 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
    • C22F1/05—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 of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

The invention discloses a kind of manufacture method of automobile gas spring novel aluminum alloy circular tube, each alloying element weight/mass percentage composition is in raw material：Si 0.48%~0.52%, Fe 0.16%~0.20%, Cu≤0.05%, Mn≤0.05%, Mg 0.51%~0.55%, Cr≤0.05%, Zn≤0.05%, Ti 0.15% 0.25%, Pb 0.004%~0.01%, Ca+Na 0.001%~0.002%, other individual element content≤0.05%, other element total amount≤0.15%, remaining as aluminium；The aluminium bar of above component is processed into using processes such as hot extrusion, drawing, finishing, finished product sawing, cleaning, Ageing Treatment, machinings, product prepared by the present invention has the advantages of plasticity and mechanical property are good, machining accuracy is high, surface quality is good, the tensile strength of product is up to 280~320Mpa, yield strength is up to 220~260Mpa, and elongation percentage is up to 12~15%.

Description

The manufacture method of automobile gas spring novel aluminum alloy circular tube
Technical field
The present invention relates to a kind of design and manufacturing process of the alloying component of aluminium alloy extrusions, and in particular to a kind of aluminium alloy Pipe, steel material is substituted, as gas spring part-piston rod, plays Telescopic Fixed effect.
Background technology
Gas spring (gasspring) is that one kind can play the functions such as support, buffering, braking, height regulation and angular adjustment Industry accessories.It is made up of following sections：Pressure cylinder, piston rod, piston, seal guide sleeve, filler (inert gas or Person's gas mixture), control element and cylinder outer control element (referring to controllable gas spring) and joint etc. in cylinder.Principle is closed Inert gas or gas mixture are filled with pressure cylinder, makes several times or tens times of the pressure superatmospheric in cavity, It is less than the cross-sectional area of piston using the cross-sectional area of piston rod so as to which caused pressure differential realizes the motion of piston rod.Due to Fundamental difference in principle, gas spring have significant advantage than common spring：Speed is relatively slow, dynamic force change is little (typically 1：Within 1.2), be easily controlled.
Conventional gas spring assembly is steel material, volume weight, corrosion easy to wear, and service life is short；And aluminium alloy Density is lower than steel, and surface treatment effect is good, and aluminium alloy passes through first high temperature extruding forming, rear to pass through rigorous timeliness again PROCESS FOR TREATMENT, there is very high corrosion resistance, the surface of aluminium alloy can form oxide-film, be not easy to get rusty naturally, easily keep beautiful Bright and clean surface；
For the intensity of aluminum alloy materials compared with steel, density is the 1/3 of steel, absorbs 2 times that impact capacity is steel, heat conduction Performance is higher than iron 3 times, and volume is lighter than steel, and has and recycle value well, with motor vehicle assembly lightweight Development, future deformations aluminum alloy materials are by increasingly extensive application in motor vehicle assembly.
At present, the plasticity for the aluminum alloy material that in the market occurs and mechanical property are poor, and machining accuracy is relatively low, surface matter Measure bad, it is difficult to meet the high quality requirement of automobile gas spring aluminium alloy.
The content of the invention
The purpose of the present invention provides a kind of plasticity and mechanical property exactly in order to solve above mentioned problem existing for prior art The manufacture method for the automobile gas spring novel aluminum alloy circular tube that energy is good, machining accuracy is high, surface quality is good.
To reach the above-mentioned purpose of the present invention, the manufacture method of automobile gas spring novel aluminum alloy circular tube of the present invention uses Following technical scheme：
In order to overcome above mentioned problem existing for prior art, change of the present invention to automobile gas spring novel aluminum alloy circular tube Study and point design be optimized, on the basis of lot of experiments research, have developed following components, the optimization of C/C composites of content, Each alloying element weight/mass percentage composition is in raw material：Si 0.48%~0.52%, Fe 0.16%~0.20%, Cu≤ 0.05%, Mn≤0.05%, Mg 0.51%~0.55%, Cr≤0.05%, Zn≤0.05%, Ti 0.15%-0.25%, Pb 0.004%~0.01%, Ca+Na 0.001%-0.002%, other individual element content≤0.05%, other element total amounts≤ 0.15%, remaining as aluminium.
The aluminium bar of above component is processed into automobile gas spring novel aluminum alloy circular tube using following process, technique：
(1) hot extrusion
Using horizontal extruder, power digital display adjustable electromagnetic induction heater is equipped with, aluminium bar heating uses gradient-heated Technique, the gap of head and tail temperature can be efficiently controlled；Machine temperature is on aluminium bar：500 DEG C~515 DEG C of head, 490 DEG C of afterbody~ 505 DEG C, discharging opening product observed temperature is controlled at 520 DEG C~540 DEG C, to ensure the performance requirement of product postorder plastic working；
Extrusion Die Design is combined type divergent die, and mould uses the high-quality steel of H13, mould domestic and foreign work calibrating strap assembling edge Embedding YG8N hard alloy, core rod sizing work band position uses high-temperature wearable hard YG8N tungsten alloy steel rings, and passes through fixed spiral shell Silk is arranged on upper mould front end and locked；Nib sizing work band also uses abrasion-resistive hard YG8N tungsten alloy steel rings, and by mechanical high Temperature and pressure build-in is scheduled in lower mould centre bore and occupied just.
(2) cold working
To the aluminium alloy material product obtained after step (1) processing, drawing, chain type pulling machine are carried out using chain type pulling machine Using three-phase alternating current variable-frequency motor governing system, smooth step-less adjustment and control can be carried out to speed；In drawing process, Xiang Guan Lubricating oil of the base surfaces externally and internally fluid infusion spray motion stickiness in 600~800cst scopes.
(3) finishing (aligning)
Long material product after step (2) drawing, then the alignment by straightener multiple roll spinning progress linearity, control The circle beating degree of product is subject to school circle in 0.05~0.08mm scopes, while to the dimension of inner and outer diameters and out of roundness of product, makes outer Footpath out of roundness control is in 0.03~0.06mm scopes, the control of internal diameter out of roundness in 0.015~0.03mm scopes；And to being made after drawing Caused residual stress is discharged in product, product size and stable performance is not rebounded.
(4) finished product sawing
Full-automatic dimension saw is programmed using (CNC), carried out by 15~20/S of single, mono- running speed back and forth complete Automatic gauging sawing.
(5) degreasing
Short material product after finished product sawing is used for diluting being adhered to product surfaces externally and internally in dedicated slot by kerosene immersion Drawing lubrication oil, then through overpickling grease removal；Product after grease removal is adhered to surface by 4~6 Rinsing Areas immersion rinse again Acid solution, enter drying oven and did low temperature drying processing with 75~90 DEG C/20~30 minutes.
(6) Ageing Treatment
Product after step (5) processing, using 175~190 DEG C/5.5~7h aging technique, carry out homogenization heat Processing, to meet the mechanical property and hardness requirement needed for product.
(7) machine
Product after Wetted constructures, scale sawing, then using (CNC) programming fully-automatic chamfering machine on by outer C30 °, Interior C60 ° carries out C chamferings inside and outside both ends.
Product after two chamfers carries out one end internal tapping processing.
(8) cleaning and flash removed
The tube and pipe of aluminium alloy product that step (7) processes, then after over cleaning and flash removed cleaning inspection are errorless, by flow The standby storehouse of vanning.
Each alloying element quality percentage contains in the manufacture method raw material of automobile gas spring novel aluminum alloy circular tube of the present invention Amount is preferably：Si 0.48%~0.52%, Fe 0.16%~0.20%, Cu0.01%~0.45%, Mn 0.01%~ 0.45%, Mg 0.51%~0.55%, Cr0.02%~0.45%, Zn 0.02%~0.45%, Ti 0.15%-0.25%, Pb 0.005%~0.008%, Ca+Na 0.0012%~0.0018%, other individual element contents≤0.04%, Qi Tayuan Plain total amount≤0.12%, remaining as aluminium.
The extrusion die specification used in above-mentioned steps (1) is preferred for Φ 180mm × 120T, before production during heating and thermal insulation Between control on 2~4h, extrusion die machine temperature control at 465 DEG C~485 DEG C, recipient heating and temperature control 420 DEG C~ 440 DEG C of scopes.
In step (2), drawing process is advisable using Φ 20 ± 0.1 × 2.0 ± 0.1 extruding material, drawing once into Type Φ 16.2 ± 0.1 × 13+0/-0.08, Φ-mm.
In step (7), chamfering tool uses high-performance cobalt alloy (HSS-E) high-speed steel；Internal tapping processing is using vertical Gear type is full-automatic/Manual tapping machine, disk is hung to being alternately engaged, coordinating the operating of variable-frequency motor adjustable speed, band using A/B gears Dynamic chuck moves up and down, and the high-quality high-speed steel spiral tap of assembling carries out blind hole internal tapping processing in chuck, and uses upper chip removal side Formula, motor pump is coordinated to convey efficient screw-cutting oil spray on product port and screw tap；Tapping processing end uses pneumatic clamps Disk folder is held between two parties, and with double fastener disk product clamping, magnetic floats the mobile operation of motor control or so transposition.
After the manufacture method of automobile gas spring novel aluminum alloy circular tube of the present invention uses above technical scheme, have following Advantage：
1. the automobile gas spring novel aluminum alloy circular tube produced, automobile gas spring part-piston rod can be used as to make With with the distinguishing feature such as good impact resistance, moderate strength, good welding performance, wear-resistant, and machining accuracy is high, surface matter Measure；
2. by strictly controlling component, the content of alloying element, and with the addition of micro Pb, Ca, Na, the tension of product is strong Degree reaches and surpassed up to 12%~15%, properties of product up to 220~260Mpa, elongation percentage up to 280~320Mpa, yield strength More DIN EN 755-2 mechanical property requirements (tensile strength >=250Mpa, yield strength >=200Mpa, elongation percentage >=10%), take Obtained unexpected technique effect.
3. product size and stable performance do not rebound afterwards for finishing (aligning), circle beating degree control is in 0.05~0.08mm models Enclose, the control of external diameter out of roundness is in 0.03~0.06mm scopes, the control of internal diameter out of roundness in 0.015~0.03mm scopes, roughness Up to 5~7 μm.
4. the product produced commercially achieves howling success, large and medium-sized automaker at home Popularization and application, and the overseas markets such as America and Europe, Japan are sold to, it is special to be only sold to German Si Taibilusi (STABILUS) gas spring The tandem product for seeking business just reaches tens thousand of.
Embodiment
To further describe the present invention, automobile gas spring of the present invention is justified with novel aluminum alloy with reference to specific embodiment The manufacture method of pipe is described in further details.
The present invention is with each alloying element weight/mass percentage composition in novel aluminum alloy circular tube raw material to automobile gas spring：Si 0.48%~0.52%, Fe 0.16%~0.20%, Cu≤0.05%, Mn≤0.05%, Mg 0.51%~0.55%, Cr≤ 0.05%, Zn≤0.05%, Ti 0.15%-0.25%, Pb 0.004%~0.01%, Ca+Na 0.001%-0.002%, Other individual element content≤0.05%, other element total amount≤0.15%, remaining as aluminium.
The aluminium bar of above component is processed into automobile gas spring novel aluminum alloy circular tube using following process, technique：
(1) hot extrusion：
Using 1000T horizontal extruders, 320KW power digital display adjustable electromagnetic induction heaters are equipped with, aluminium bar heating is adopted With gradient-heated technique, the gap of head and tail temperature can be efficiently controlled, machine temperature is on aluminium bar：500 DEG C~515 DEG C of head, tail 490 DEG C~505 DEG C of portion, discharging opening product observed temperature is controlled at 520 DEG C -540 DEG C, to ensure product postorder plastic working Performance requirement；
Extrusion Die Design is combined type divergent die, and mould uses the high-quality steel of H13, and YG8N hard alloy is inlayed in assembling, uses In mould domestic and foreign work calibrating strap, core rod sizing work band position uses high-temperature wearable hard YG8N tungsten alloy steel rings, led to Cross fixed screw to lock installed in upper mould front end, nib sizing work band and the abrasion-resistive hard YG8N tungsten alloy steel rings used, Occupied just by press-fitted be fixed in lower mould centre bore of mechanical high-temperature.Sizing work band (the abrasion-resistive hard YG8N tungsten alloy steel of mould Circle) grinding and polishing is run at high speed into mirror-like using numerically controlled lathe.Pass through grinding and polishing, the smoothness of mould sizing work band Quality significantly improves, and can effectively mitigate frictional force during crimp, so as to improve the light of extrusion billet surfaces externally and internally The cycle and life-span that clean quality and mould use；Also ensure that simultaneously can bear high temperature, high pressure in extrusion process and acutely become Under conditions of shape frictional force, the finish and intensity of mould calibrating strap are not affected, and it is bright and clean to squeeze the blank surface produced, Without particle, without vertical line, so as to ensure that product surface degree light after postorder drawing is round and smooth, dimensional accuracy stably reaching standard is no different Often.
Mould specification is 180 × 120T of Φ, and heating and thermal insulation time control machine temperature control on 2-4h, mould exists before production 465 DEG C~485 DEG C, recipient heating-up temperature is 420 DEG C~440 DEG C, to ensure that material product reaches the pattern of Isothermal Extrusion；
Using T8 machining states, [T8 refers to hot, cold-formed Al-alloy products to the product, and it passes through solution heat treatment After being also cold worked the intensity that (drawing) improves product after (forced air cooling) again, then carry out the state of artificial aging]；Using constant speed 40% (4.8mm/s) extrusion speed, to ensure the dimensional accuracy of material product and obtain good surface weld line mass；Long material material Product after scale sawing, spinning beam head, cleaning treatment, carries out cold working (drawing) production again.
(2) cold working (drawing)
Drawing refers to that aluminium alloy material product subtracts the pattern of wall plastic deformation processing by drawing mould, implementation tube reducing, from And obtain high-precision final products size requirement.
Drawing equipment is chain type pulling machine, using three-phase alternating current variable-frequency motor governing system, speed can be carried out realizing and put down Sliding step-less adjustment and control.Drawing equipment is conveyed by main body, folder car device, chain belt backhaul, and die holder, pull bar, product place work Make platform, pneumatic system and electric control system composition.
Technical parameter：Main motor current 40-50KW, drawing speed use variable frequency regulating speed control mode, 0~60m/min, gas Source pressure 0.3-0.6Mpa, can the product such as drawing 5~Φ of Φ 60mm pipe, bar, profile shapes, pulling length≤7m.
Drawing process：
Using Φ 20 ± 0.1 × 2.0 ± 0.1 extrude material, drawing one-shot forming 16.2 ± 0.1 × 13+0/-0.08 of Φ, Machining deformation amount is 35.11% sizing reduction 3.8mm, wall thickness reducing amount 0.4mm.
In order to ensure the bright and clean roughness of product surfaces externally and internally, it is equipped with and uses efficient aluminium drawing special lube, In drawing process, using effectively drawing lubrication oil and lubricating system for strengthen drawing production process, improve production efficiency and Product quality has great importance；When drawing produces, a kind of motion stickiness need to be sprayed to pipe surfaces externally and internally fluid infusion 600-800cst lubricating oil, in pipe and die deformation friction relative movement, in the presence of the compression of arc modular angle, Lubricating oil forms turnup accumulation in die deformation area porch, forms lubrication and physical absorption effect comprehensively, when pressure reaches gold During category deformation yield limit, lubricating oil is just extruded to be brought into deformed area along arc angle transition, and forming one layer has certain thickness Lubricating oil film, be attached on pipe surfaces externally and internally and separate Mold Metal, play a part of to mould anti-attrition cooling and well Lubricant effect.Using efficient lubricant oil, it is avoided that in flow of metal friction relative motion and crosses boundary's friction and mixed film friction, effectively Ground reduces the deformation frictional resistance in drawing process, so as to improve lubrication and effect.
Extrude material product to control by arranging in pairs or groups meticulously inside and outside drawing mould, to implement the one-time formed operation mould of drawing Formula, so as to produce the high-precision high-quality long material product of good performance of size.
(3) finishing (aligning)
The relevant data that table 1 contrasts for the inspection of aligning anteroposterior dimension.
Table 1 aligns anteroposterior dimension and checks correction data
Long material product after drawing, then the alignment by straightener multiple roll spinning progress linearity, to reach product The control requirement of beating degree, while school circle also is subject to the inside/outside diameter size and out of roundness of product, and to being produced in product after drawing Raw residual stress is discharged, and product size and stable performance is not rebounded.
(4) finished product sawing：
Full-automatic dimension saw is programmed using (CNC), single often arrange can sawing≤25pcs simultaneously, float motor with magnetic Cooperation induction system is held with Pneumatic pressure, the speed that saw blade is turned with every S/3000, coordinates and sprays efficient coolant, by single 15- The running speeds of 20/S mono- back and forth carry out full-automatic scale sawing, during which only need hand fit's operation of feeding and discharging, should Equipment can ensure that the length tolerance after product sawing reaches≤0.4mm, reach≤below 0.1mm with port perpendicularity.
(5) degreasing (oil removing cleaning, drying)
Short material product after finished product sawing is soaked 20 minutes or so in dedicated slot by kerosene, and production is adhered to for diluting The drawing lubrication oil of product surfaces externally and internally, then through overpickling grease removal 5-10 minutes, solution ratio：2%-5% acid solution, add 3m3 Running water dilution；Product after grease removal is adhered to the acid solution on surface by 5 Rinsing Areas immersion rinse again, enters drying oven with 80 DEG C/20-30 minutes do low temperature drying processing.
(6) Ageing Treatment (heat treatment)
In order to ensure and stablize the mechanical property of lifting product, using 185 DEG C/6h aging technique, homogenization heat is carried out Processing, to meet the mechanical property and hardness needed for product；Different aging techniques has very big to the mechanical property of product Change, experimental test data such as table 2：
The Ageing Treatment experimental test data of table 2 compares
(7) (two chamfers, one end internal tapping) is machined
Product after Wetted constructures, scale sawing, then programmed using (CNC) and outer C30 ° is pressed on fully-automatic chamfering machine, Interior C60 ° carries out c chamferings inside and outside both ends.
Chamfering tool uses high-performance cobalt alloy (HSS-E) high-speed steel, and the cutter material is more with amount containing cobalt, anti-wear Can be good, blade, to meet 30 °/60 ° angle requirements, does not produce shake knife in process using unique technical standpoint design With the bad exception of bits myomata etc.；Angle precision can reach national standard, in Europe superscript control range.
Product after two chamfers carries out one end internal tapping processing, using vertical gear formula it is full-automatic/Manual tapping machine, profit Disk is hung to being alternately engaged, coordinating the operating of variable-frequency motor adjustable speed, driving chuck to move up and down, assembled in chuck with A/B gears High-quality high-speed steel spiral tap carries out blind hole internal tapping processing, and uses upper chip removal mode, coordinates motor pump conveying efficiently to attack Silk lubricating oil spray, not produce high temperature friction when ensureing that screw tap works with product, is avoided because of profit on product port and screw tap The bad exception such as rotten tooth, bits sarcolytes caused by sliding deficiency；Product needs tapping processing end to be held using pneumatic clamps disk folder between two parties, with double Chuck product clamping, magnetic float the mobile operation of motor control or so transposition, and so as to ensure equipment, operation does not stop up and down automatically, Production efficiency is greatly increased, while also can guarantee that the precision after product tapping processing.
Detection is screwed using special go-no go gauge after the product tapping, by for non-defective unit, can't pass as defective products, product Half-and-half break, using 2D video detections silk depth of threat degree and tooth away from height, to ensure the accurate of the size at product silk tooth position requirement Property；
Pipe (piston rod) product is processed by above-mentioned flow, then after over cleaning and flash removed cleaning inspection are errorless, is pressed Wait to deliver goods in the standby storehouse of flow vanning.
The automobile gas spring novel aluminum alloy circular tube that the present invention develops and automobile gas spring special tubes and pipes of aluminium alloy (foreign steamer Exterior feature is seven tooth flower type structures for five tooth flower type structures or Internal periphery) combination, i.e.,：The one of automobile gas spring novel aluminum alloy circular tube End suit, it is weldingly fixed in automobile gas spring aluminium alloy shaped-tube, forms aluminum alloy series product component, successfully grind Hair trial-production is completed, and is received by the market.

Claims (5)

  1. A kind of 1. manufacture method of automobile gas spring novel aluminum alloy circular tube, it is characterised in that each alloying element quality in raw material Percentage composition is：Si 0.48%~0.52%, Fe 0.16%~0.20%, Cu≤0.05%, Mn≤0.05%, Mg 0.51%~0.55%, Cr≤0.05%, Zn≤0.05%, Ti 0.15%-0.25%, Pb 0.004%~0.01%, Ca+ Na 0.001%~0.002%, other individual element content≤0.05%, other element total amount≤0.15%, remaining as aluminium；With The aluminium bar of upper component is processed into automobile gas spring novel aluminum alloy circular tube using following process, technique：
    (1) hot extrusion
    Using horizontal extruder, power digital display adjustable electromagnetic induction heater is equipped with, aluminium bar heating uses gradient-heated technique, Machine temperature is on aluminium bar：500 DEG C~515 DEG C of head, 490 DEG C~505 DEG C of afterbody, discharging opening product observed temperature are controlled 520 DEG C~540 DEG C；
    Extrusion Die Design is combined type divergent die, and mould uses the high-quality steel of H13, and the assembling of mould domestic and foreign work calibrating strap is inlayed YG8N hard alloy, core rod sizing work band position uses high-temperature wearable hard YG8N tungsten alloy steel rings, and passes through fixed screw Locked installed in upper mould front end；Nib sizing work band also uses abrasion-resistive hard YG8N tungsten alloy steel rings, and passes through mechanical high-temperature Press-fitted be fixed in lower mould centre bore occupies just；
    (2) cold working
    To the aluminium alloy material product obtained after step (1) processing, drawing is carried out using chain type pulling machine, chain type pulling machine uses Three-phase alternating current variable-frequency motor governing system is controlled；In drawing process, spray and move to pipe surfaces externally and internally fluid infusion Lubricating oil of the stickiness in 600~800cst scopes；
    (3) finishing
    Long material product after step (2) drawing, then the alignment by straightener multiple roll spinning progress linearity, control product Circle beating degree be subject to school circle in 0.05~0.08mm scopes, while to the dimension of inner and outer diameters of product and out of roundness, and to drawing Caused residual stress is discharged in product afterwards, product size and stable performance is not rebounded；
    (4) finished product sawing
    Full-automatic dimension saw is programmed using (CNC), carried out by 15~20/S of single, mono- running speed back and forth full-automatic Scale sawing；
    (5) degreasing
    Short material product after finished product sawing is used for diluting the drawing for being adhered to product surfaces externally and internally in dedicated slot by kerosene immersion Lubricating oil is pulled out, then through overpickling grease removal；Product after grease removal is adhered to the acid on surface by 4~6 Rinsing Areas immersion rinse again Liquid, enter drying oven and did low temperature drying processing with 75~90 DEG C/20~30 minutes；
    (6) Ageing Treatment
    Product after step (5) processing, using 175~190 DEG C/5.5~7h aging technique, carries out homogenizing hot place Reason, to meet the mechanical property and hardness requirement needed for product；
    (7) machine
    Product after Wetted constructures, scale sawing, then using (CNC) programming fully-automatic chamfering machine on by outer C30 °, it is interior C60 ° carries out C chamferings inside and outside both ends；
    Product after two chamfers carries out one end internal tapping processing；
    (8) cleaning and flash removed
    The tube and pipe of aluminium alloy product that step (7) processes, then after over cleaning and flash removed cleaning inspection are errorless, cased by flow Standby storehouse.
  2. 2. the manufacture method of automobile gas spring novel aluminum alloy circular tube as claimed in claim 1, it is characterised in that in raw material Each alloying element weight/mass percentage composition is：Si 0.48%~0.52%, Fe 0.16%~0.20%, Cu0.01%~ 0.45%, Mn 0.01%~0.45%, Mg 0.51%~0.55%, Cr0.02%~0.45%, Zn 0.02%~ 0.45%, Ti 0.15%-0.25%, Pb 0.005%~0.008%, Ca+Na 0.0012%~0.0018%, it is other single Constituent content≤0.04%, other element total amount≤0.12%, remaining as aluminium.
  3. 3. the manufacture method of automobile gas spring novel aluminum alloy circular tube as claimed in claim 1 or 2, it is characterised in that： The extrusion die specification used in above-mentioned steps (1) for Φ 180mm × 120T, before production heating and thermal insulation time control in 2~4h, Machine temperature control is at 465 DEG C~485 DEG C on extrusion die, and recipient heating and temperature control is in 420 DEG C~440 DEG C scopes.
  4. 4. the manufacture method of automobile gas spring novel aluminum alloy circular tube as claimed in claim 3, it is characterised in that：In step (2) in, drawing process uses Φ 20 ± 0.1 × 2.0 ± 0.1 extruding material, 16.2 ± 0.1 × 13+ of drawing one-shot forming Φ 0/-0.08, Φ-mm.
  5. 5. the manufacture method of automobile gas spring novel aluminum alloy circular tube as claimed in claim 4, it is characterised in that：In step (7) in, chamfering tool uses high-performance cobalt alloy (HSS-E) high-speed steel；Internal tapping processing using vertical gear formula it is full-automatic/hand Dynamic tapping machine, disk is hung to being alternately engaged, coordinating the operating of variable-frequency motor adjustable speed, driving chuck to move up and down using A/B gears, The high-quality high-speed steel spiral tap of assembling carries out blind hole internal tapping processing in chuck, and uses upper chip removal mode, coordinates motor pump Efficient screw-cutting oil spray is conveyed on product port and screw tap；Tapping is processed end and held between two parties using pneumatic clamps disk folder, uses Double fastener disk product clamping, magnetic float the mobile operation of motor control or so transposition.
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CN111069333A (en) * 2019-12-12 2020-04-28 天津航天长征技术装备有限公司 Precise forming method for aluminum alloy thin-wall cylinder
CN112247594A (en) * 2020-10-09 2021-01-22 重庆特力普尔机械设备有限公司 Nitrogen spring production line and production process

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CN103924137A (en) * 2014-04-30 2014-07-16 南通易实工业制造有限公司 High-strength aluminium alloy
CN106133204A (en) * 2014-03-24 2016-11-16 肯联铝业机床杰钦有限公司 Have that the 6XXX alloy of low roughness is made and through turning and the production method of anodised machine components after anodic oxidation

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CN106133204A (en) * 2014-03-24 2016-11-16 肯联铝业机床杰钦有限公司 Have that the 6XXX alloy of low roughness is made and through turning and the production method of anodised machine components after anodic oxidation
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CN111069333A (en) * 2019-12-12 2020-04-28 天津航天长征技术装备有限公司 Precise forming method for aluminum alloy thin-wall cylinder
CN111069333B (en) * 2019-12-12 2021-11-02 天津航天长征技术装备有限公司 Precise forming method for aluminum alloy thin-wall cylinder
CN112247594A (en) * 2020-10-09 2021-01-22 重庆特力普尔机械设备有限公司 Nitrogen spring production line and production process
CN112247594B (en) * 2020-10-09 2021-09-17 重庆特力普尔机械设备有限公司 Nitrogen spring production line and production process

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