CN100558922C - A kind of leadless easy-cut aluminum alloy material and manufacturing process thereof - Google Patents
A kind of leadless easy-cut aluminum alloy material and manufacturing process thereof Download PDFInfo
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Abstract
The invention discloses a kind of lead-free free-cutting alloy material, its Chemical Composition (weight percent) is as follows: Si:0.4～0.9%, and Fe:＜0.5%, Cu:0.3～0.9%, Mn:＜0.35, Mg:0.7～1.2%, Cr:＜0.15%, Ti:＜0.10%, Sn:0.8～1.3%, inevitable impurity of surplus and Al the invention also discloses a kind of manufacture method of above-mentioned aluminum alloy materials, and its manufacturing technology steps is: founding-homogenizing-extruding-quenching-drawing-timeliness; Adopt the leadless easy-cut aluminum alloy material of above-mentioned prescription and technology to have higher mechanical property, be easy to cutting machine processing, not leaded compliance with environmental protection requirements, the advantage that effectively reduces cost.
Description
Technical field
The present invention relates to aluminium alloy extrusions and manufacturing technology field thereof, refer in particular to a kind of leadless easy-cut aluminum alloy material and manufacturing process thereof.
Background technology
Along with the raising of social economy's level and the enhancing of human environment protection health consciousness, harmful elements such as lead, cadmium have enjoyed the great attention of the whole society to the pollution of living environment and the injury of human health.According to medical expert's introduction, lead is a kind of harmful element, is taken in the back by human body and is difficult for being drained, can cause various harm to human body, destroy hemopoietic system, hinder the synthetic of protoheme, cause anaemia thereby increase blood pressure, influence digestive system function, suppress function of immune system, influence organs such as liver, kidney, disturb renal function and reproductive function, and irreversible damage brain, damage big mesencephalic centre and peripheral nervous system; The clinical manifestation of each chronic poisoning is: pulmonary emphysema, sclerotin change, anaemia also can make the people paralyse.Especially children are owing to the digestive tube specific absorption becomes the lead poisoning high risk population for high 5 times than the grownup.According to disclosure, the urban children Pb-B of China 30%-40% exceeds standard.
On the other hand, product to objectionable impuritiess such as leaded, cadmiums is provided with strict technology barriers in the world: on February 13rd, 2003, " about in electronic electric equipment, banning use of some objectionable impurities instruction " that the L37 of the European Union phase " Official Journal " has been announced European Parliament and the common approval of the EU Council of Ministers (ROHS2002/95/EC).This instruction is that European Union has a great new measure in field of environment protection; requirement forbids selling the electronic electric equipment that contains cadmium, lead, mercury, sexavalent chrome, poly-two ethers of bromine and 6 kinds of objectionable impuritiess of poly-bromo biphenyl from July 1st, 2006 in European Union market, the application range of products of instruction comprises ten big electron-like electric products such as household electrical appliances, communication.Environment management and control material suggestion limit value: cadmium: 100PPm, lead, mercury, sexavalent chrome, poly-two ethers of bromine and each 1000PPm of poly-bromo biphenyl.The ROHS of European Union is referred to as to affect " the unleaded instruction " of " global manufacturing nerve " by industry, will be to production, especially medium and small dynamo-electric enterprise has an immense impact on, it is reported, European Union is China's electronic product outlet second largest market, last year, export value was up to 904.8 hundred million dollars, accounted for 21% of China's electronic product gross export value.The enforcement of the ROHS of European Union instruction will cause great effect to China about sixty percent electronic product outlet European Union, simultaneously, the upstream industry chain also will face impact, the picture electronic devices and components, mechanical part, starting material and component such as auxiliary material, all to satisfy the requirement of ROHS instruction, otherwise product just can not enter European Union market, many component aluminium alloys of these products adopt easy-cutting aluminum alloy precision work such as 2011 and 6262 to form in the past, and these easy-cutting aluminum alloy such as 2011 and 6262 all contain European Union's environment management and control material lead, again seize the European market, break the technology barriers of European Union, the new type leadless easy cutting alloy product that exploitation meets the requirement of the ROHS of European Union instruction technique becomes current very urgent research topic.
At present, in easy-cut aluminum alloy material, generally all contain lead, in order to address this problem, someone has adopted the aluminum alloy materials that is easy to process of this prescription, as China Patent No. be: application number ZL95191055, the applying date is September 15 nineteen ninety-five, denomination of invention be unleaded 6 * * * patent of aluminium alloy, it basic composition is: the copper of about 0.15-1.0% (weight), the tin of about 0.4-1.5% (weight), the magnesium of about 0.65-1.35% (weight), the silicon of about 0.4-1.1% (weight), the manganese of about 0.002-0.35% (weight), the iron of maximum about 0.5% (weight), the chromium of about 0.15% (weight) and the titanium of about 0.15% (weight) at most at most, surplus is aluminium substantially.This alloy lead-free, the while also has the advantage of the mechanical workout of being easy to, but complex manufacturing cost height.
Summary of the invention
Purpose of the present invention is exactly at the deficiencies in the prior art, and a kind of lead-free free-cutting, leadless easy-cut aluminum alloy material that cost is low are provided.
Another object of the present invention also is to provide a kind of above-mentioned leadless easy-cut aluminum alloy material manufacturing technology method.
The solution that the present invention adopts in order to achieve the above object is as follows:
This leadless easy-cut aluminum alloy material is on the basis of 6xxx alloy, removes harmful element lead (Pb), adds element tin (Sn), and the content of tin (Sn) is optimized, thereby preparation environment-friendly type lead-free easy-cutting aluminum alloy, the weight percent that its Chemical Composition is following: Si:0.4～0.9%, Fe:＜0.5%, Cu:0.3～0.9%, Mn:＜0.35, Mg:0.7～1.2%, Cr:＜0.15%, Ti:＜0.10%, Sn:0.8～1.3%, inevitable impurity of surplus and Al.
The present invention adopts following processing step to produce above-mentioned leadless easy-cut aluminum alloy material: founding-homogenizing processing-extruding-quenching-drawing-timeliness; Wherein
Select for use the founding pool surface to amass little industrial furnace in the founding operation, and adopt the heavy oil reverberatory smelting.And must thoroughly clear up empty stove before the melting, use the prepurging of fine aluminium ingot in case of necessity.Add aluminium ingot on order of addition(of ingredients) earlier, the silicon ingot that fusing point is high is added in the upper surface of aluminium ingot, adopts superfast loading, and high temperature melts fast, and smelting temperature 740-760 ℃, melting rate 4-5t/h.Flat when solid materialsization, during 740-750 ℃ of melt temperature rising, take that scum silica frost spreads one deck insulating covering agent in the stove off, its consumption is 3Kg/m
3The Sn ingot is sawn into the fritter of the about 20mm of thickness on sawing machine.Under the flux coverage condition, the Sn piece evenly adds in the stove.Have to be paid attention at 2, first is the homogeneity of alloying constituent, is preferably in the smelting furnace that magnetic stirrer is housed to produce, if no electromagnetic mixing apparatus then must fully stir with drag.Second is the refining purification of aluminium alloy melt, and degasification must be thoroughly.Its concrete measure is suitable when the raising melt temperature, and the reduction melt viscosity strengthens the consumption that dusts with high pure nitrogen, and after refining finished, melt left standstill in stove after 20 minutes to be cast.During casting, melt adopts two-stage filtration, and prime is a multiple glazing silk cloth, and secondary is a 40PPI aluminum oxide foam ceramic filter plate.
In process of production, adopt the hot ejection device of same level to carry out semicontinuous casting, adopt the casting technique of " high temperature-slow cooling-at a slow speed-add silk ".
In the homogenizing treatment process, adopt the processing parameter of 520 ℃ of-560 ℃ * 4h-10h.Wherein optimum parameter is 540 ℃ * 6h.
The beneficial effect that the present invention adopts above-mentioned technical solution to reach is: its aluminium alloy is to form low melting point with tin (Sn) element and magnesium (Mg) element in matrix to organize constituent (eutectic), replace plumbous (Pb) and bismuth (Bi) element, this low melting point is in cutting process, because when the heat that frictional heat produces reaches its fusing point, smear metal is discontinuous, easily broken, can significantly improve the cutting ability of aluminium alloy, this alloy not only has machinability preferably, not leaded objectionable impurities of while, compliance with environmental protection requirements; Meanwhile also enhance productivity effectively, reduce cost, product performance and surface smoothness all have raising preferably.
Leadless easy-cut aluminum alloy of the present invention changes interpolation tin, replaces original poisonous element lead (Pb), simultaneously, has also cancelled the adding of Bi.Make the application of easy-cutting aluminum alloy break through the restriction of unleaded instruction, promote the progress of domestic easy-cutting aluminum alloy industry greatly, be the important breakthrough mouth that continues to strengthen China's aluminium alloy industry outlet, economic benefit and the social benefit that improves the aluminium alloy industry had crucial meaning.
The lightweight that aluminium alloy of the present invention itself is had, high strength, high precision, huge advantage such as can repeat to recycle, be convenient to process, the demand of aluminium alloy is just presenting the impetus of steady growth, except that being widely used in covil construction, all obtained utilization in extensive fields such as machinery, electronics, traffic, military project, aerospace.Along with growth in the living standard, the enhancing of environmental consciousness, people also more and more pay attention to health, unleaded notion is from proposing real realization up till now, further promoted easy-cutting aluminum alloy advantage development worldwide, particularly the leadless easy-cut aluminum alloy product has been broken through the technology barriers of European Union ROHS instruction, will bring glad tidings to starting material such as the upstream industry of electric production such as electronic devices and components, mechanical part, auxiliary material and component, has very wide application prospect.
Embodiment
The 6020A aluminum alloy materials of present embodiment comprises following chemical weight percent composition: Si:0.4～0.9%, Fe:＜0.5%, Cu:0.3～0.9%, Mn:＜0.35, Mg:0.7～1.2%, Cr:＜0.15%, Ti:＜0.10%, Sn:0.8～1.3%, inevitable impurity of surplus and Al, manufacturing process of the present invention is as follows: the still bar of present leadless easy-cut aluminum alloy product consumption maximum, and the technological process of production of bar is as follows: founding-homogenizing processing-extruding-quenching-drawing-timeliness; Below each technology is respectively described below:
The founding of leadless easy-cut aluminum alloy:
Because the fusing point of metal Sn is low, in the high temperature fusion-casting process, vapors away easily, in order to reduce the volatilization loss of Sn, should select for use the founding pool surface to amass little industrial furnace, as low frequency induction furnace.Because be subjected to the restriction of industrial equipment condition, we adopt the heavy oil reverberatory smelting.Add the pollution of element in order to reduce to alloy, must thoroughly clear up empty stove before the melting, carry out prepurging with the fine aluminium ingot in case of necessity, add aluminium ingot on order of addition(of ingredients) earlier, the silicon ingot that fusing point is high is added in the upper surface of aluminium ingot, adopts superfast loading, high temperature melts fast, shorten smelting time as far as possible, improve equipment capacity, reduce oxidational losses.Our smelting temperature 740-760 ℃ of adopting, melting rate 4-5t/h.When solid materialsization flat, during 740-750 ℃ of melt temperature rising, take off come out of the stove in scum silica frost spread one deck insulating covering agent, its consumption is 3Kg/m
3The Sn ingot is sawn into the fritter of the about 20mm of thickness on sawing machine, under the condition that flux covers, the Sn piece evenly adds in the stove.For the melting of leadless easy-cut aluminum alloy, have to be paid attention at 2, first is the homogeneity of alloying constituent.Because the proportion of Sn greater than aluminium, is very easily given birth to gravity segregation, produce so be preferably in the smelting furnace that magnetic stirrer is housed, if no electromagnetic mixing apparatus then must fully stir with drag.Have only Sn to distribute, just can obtain the aluminium of cutting ability excellence with minimum uniform particles.Second is the refining purification of aluminium alloy melt, and degasification must be thoroughly.In view of we do not have the outer online refining plant of stove, has only the furnace purge of increasing effect.Its concrete measure is suitable working as to improve melt temperature, reduces solution viscosity, strengthens the consumption that dusts with high pure nitrogen, and to reach raising degasification slagging-off at present, after refining finished, melt left standstill in stove after 20 minutes to be cast.During casting, melt adopts two-stage filtration, and prime is a multiple glazing silk cloth, and secondary is a 40PPI aluminum oxide foam ceramic filter plate.
In process of production, adopt the hot ejection device of same level to carry out semicontinuous casting, because the Sn fusing point is low, temperature range is big during crystallization, and transition band width has very big difference with 6063 aluminium alloy castings of routine.Its subject matter has two, and one is that aluminum alloy melt spills from crystallizer, causes and can not carry out smoothly; Another is the excellent generation of a casting center thermal crack.Adopt the casting technique of " high temperature-slow cooling-at a slow speed-add silk "; so-called high temperature promptly suitably improves melt temperature; reduce viscosity; increase mobile; talcum mud secure adhesion on the protection crystallizer pinboard; aluminium liquid evenly flows on the crystallizer graphite annulus, once cools off, and forms the solidified shell of thickness unanimity.The discharge of hydrogen when simultaneously, also helping crystallization.Slow cooling and mainly be at a slow speed to reduce liquid point depth reduces internal stress, overcomes hot cracking tendency.Adding promptly is to add the thread grain-refining agent of Al-5Ti-1B, increases crystallization nuclei, and the crystal grain thinning tissue helps overcoming hot cracking tendency, improves material mechanical performance.
For example, casting 6020B leadless easy-cut aluminum alloy Φ 130mm billet, we adopt following technology condition: cast out temperature 740-760 ℃, cooling water pressure 0.1MPa, temperature of cooling water 35-40 ℃, teeming speed 90mm/min, Al-5Ti-1B fining agent consumption 0.2% can successfully be produced qualified round ingot casting.The homogenizing of leadless easy-cut aluminum alloy casting rod is handled:
During homogenizing annealing, it is that dendritic segregation is eliminated and the non-equilibrium phase dissolving that main tissue changes, thereby solute concentration homogenizing gradually, simultaneously during homogenizing annealing, the decomposition of supersaturated solid solution is usually arranged, undissolved just may the generation in annealing process assembled and nodularization, to reduce interfacial energy, reaches more stable status of thermodynamics.Handle through homogenizing, eliminated the residualinternal stress that exists in the ingot casting, because above-mentioned variation has taken place in homogenizing when handling, plasticity is improved and the processing performance of cold and hot distortion is greatly improved, thereby the resistance to deformation when having reduced extruding, improve extrusion speed, improved the performance and the surface quality of goods.
In trial production process because 6 * * * the lead-free free-cutting alloy we adopt 520 ℃ * 10h, 540 ℃ * 6h, 560 ℃ * process programs such as 4h, test shows 520 ℃ * 10h because temperature is on the low side, time is oversize, reduced equipment productivity, diesel consumption is many, the cost height.560 ℃ * 4h scheme is cast excellent microstructure slight burning, and the control of homogenization temperature should be lower than this alloy solidus temperature below 15 ℃, finally selects 540 ℃ * 6h homogenizing processing scheme.6 * * * easy-cutting aluminum alloy in the homogenizing heat treatment process, except following the heat treated universal law of homogenizing, also have its singularity.Owing to added low melting point element Sn, under the homogenizing treatment temp, these low melting points are in melted state, also have a little particle to be in vaporized state, it is faster than solid diffusion that it reaches isostatic speed, and the particle particle is trickleer, helps improving the cutting ability of aluminium alloy.Because the aluminium alloy cast ingot outside surface covers the aluminum oxide film of one deck densification, low melting points such as Sn can not penetrate it and run off.
The extrusion process of leadless easy-cut aluminum alloy
Extrusion process parameters mainly is temperature and speed, and whether parameter is selected correct, and to the tissue of extruded product, performance and technico-economical comparison all have very big influence.
Rational temperature scope during extruding should make material have best plasticity, and more excellent resistance to deformation and assurance goods can obtain even favorable tissue structure and mechanical property.
The tissue of extrusion speed and goods, the relation between the performance mainly are to embody by the thermal equilibrium that influences metal.Extrusion speed is low, the loss of metal heat many, cause the extruded product afterbody worked structure to occur, the extrusion speed height, heat has little time loss, it is too fast that metal temperature is raise.Have only temperature to cooperate well, just can produce good squeezing prod with speed.
Use the billet of ingot casting diameter 130mm in the manufacturing processed, the pole of 1000t extrusion machine extruding Φ 13.5 once squeezes four with plane, four holes mould, and extrusion ratio is roughly 25.But the chemical ingredients of 6020B leadless easy-cut aluminum alloy is compared with 6061 aluminium alloys, and except that Sn, other compositions are roughly approaching, but its extrusion process and 6061 differs greatly.6061 aluminium alloy extruded technologies are generally: 450 ℃ of container Heating temperatures, extrusion speed can reach 15-20 rice/minute.And the 6020B leadless easy-cut aluminum alloy is manufactured experimently under above-mentioned extrusion process condition, even pushing under the lower velocity very much, there are many grooves on the bar surface along axis direction, and the back roll-in of quenching also is difficult to eliminate.When the container Heating temperature is brought up to 470 ℃, the ingot casting temperature is brought up to 490-510 ℃, and the bar surface quality is greatly taken on a new look, extrusion speed can reach 10-13 rice/minute.The reason that produces above-mentioned abnormal phenomena may be when high temperature, and fused low melting point flowability improves, and does not adhere on the work zone of mould, extruding condition is improved, not only improve the bar quality, and improved extrusion speed, increased yield of unit time.The tail that occurs contracting when extruding finishes in the bar production process is difficult to avoid, and therefore cuts the sufficient tail that contracts, and guarantees that the weave construction and the mechanical property of rod is very important.
The crimp coefficient 20-60 of the extrusion process that 6020B enforcement of the present invention is adopted, 470 ℃ of container temperature, 490-510 ℃ of ingot casting Heating temperature, extrusion speed 5-13 rice/minute.
The quenching of leadless easy-cut aluminum alloy
Aluminium alloy quenches, and to be the sosoloid that forms for solution heat treatment the time obtain metastable supersaturated solid solution in quenching mode fast, in the hope of obtaining high intensity and enough plasticity in subsequently timeliness.
When leadless easy-cut aluminum alloy quenches, it is the same to quench with other aluminium alloys, mainly be the selective quenching temperature, the control soaking time is quenched transfer time and speed of cooling in general, quenching temperature is high more, strengthening phase in the alloy dissolves in the sosoloid abundant more, and the composition of sosoloid is even more, and is then just high more with mechanical property after quench aging, but the too high meeting of temperature causes that crystal grain is thick, even burning takes place and makes product rejection.
Under normal solution heat treatment temperature, the time that the abundant solid solution of aluminium alloy is required, with the weave construction before the material heat treatment, the machining state of type of heating and material, the composition of alloy, the geometrical dimension of material is closely related.
Adopt the vertical air recirculation still when we produce as a trial, use electrically heated, adopt following processing condition, Φ 13.5mm * 6000mm pushes pole, every stove charge amount 1000Kg.6 * * * 540 ℃ * 2h of serial free cutting alloy, the transfer time of quenching be not more than 10S, and quenchant is a water, and water temperature≤30 ℃ adopt pressurized air to stir, cooling tower circulation cooling.
Detect through sampling, bar crystal grain is not seen considerable change before and after quenching.
(extruding of Φ 13.5mm * 6000mm) pole, 540 ℃ * 2h, quenching is not more than 15S transfer time, quenching water temperature≤30 ℃ in the solution heat treatment of the quenching technology of the embodiment of the invention.
The drawing process of leadless easy-cut aluminum alloy
Easy-cutting aluminum alloy requires mostly to be greatly the bar of plurality of specifications, and accuracy requirement height, diameter deviation are generally ± 0.05mm, and is often overproof after the bar extruding like this, can satisfy by the sintered carbide die cold drawing.The production and sales state is generally T3 or T8, and a small amount of order is T9.Pole is in control process, and aluminium alloy is in positive pressure, and under the effect of drawing force and frictional force, the metal of distorted area is in two basically to a pressurized and a stressed condition to tension, and stress is state axisymmetricly.Along with the increase of deformation extent, metal anti-stretching intensity and yield strength improve, and unit elongation descends.For leadless easy-cut aluminum alloy material, deflection is controlled at about 10% usually, and deflection is too little, and the drawing rear surface is rough; Deflection is too big, though tensile strength and yield strength can guarantee that elongation is less than normal.Deflection is about 10%, and the mechanical property of leadless easy-cut aluminum alloy is listed in table 1.
The mechanical property of table 1 leadless easy-cut aluminum alloy
Alloy model state σ b, MPa σ
0.2, Mpa δ, (%)
T3 ≥270 ≥245 10
6 * * * serial T8 〉=310 〉=280 10
T9 ≥350 ≥330 7
The aging technique of leadless easy-cut aluminum alloy
From Principles of Heating Processing, timeliness again after the cold drawn distortion of solid solution, the variation of two aspects can take place in alloy, first: alloy can be replied, and aging temp is high, also recrystallize can take place, answer and recrystallize can make alloy strength reduce, and elongation can raise; Second: sosoloid can divide and parses second phase in the ag(e)ing process, and timeliness is separated out and can be made intensity raise, and elongation descends.
We carry out the aging test of different time at 170 ℃, 180 ℃, 190 ℃ of temperature condition respectively with the 6020B aluminium alloy in trial production process, collected great number tested data, and two kinds of alloy typical case ageing treatment tensile mechanical properties are relatively listed in table 2.
The different aging technique treated state tensile mechanical properties of table 2,6020B alloy
Alloy model state aging technique σ b/MPa σ
0.2/ Mpa δ/%
170℃×8h 350 338 13.5
6020B T8 180℃×4h 342 326 13.6
190℃×1h 338 316 14.6
In actual production, for following aging technique is adopted in the potential performance suggestion of giving full play to leadless easy-cut aluminum alloy: the 6020B aging technique is 170 ℃ * 8h.
In a word, the present invention adopts optimization design extruding and thermal treatment process, guarantees product comprehensive mechanical property, protection against corrosion etc., satisfies client's demand, is applicable to the aluminum alloy extrusion section bar that needs through the mechanical workout class.
Characteristic (table 3):
Alloy model state corrosive nature plasticity-cutting ability weldability
T6 A C B B
6020B
T8 A D B B
(annotate: press that A-is excellent, B-good, among the C-, the division of D-difference)
The present invention compares with the technical feature of domestic and international similar typical products
At present both at home and abroad the 6xxx easy-cutting aluminum alloy mainly is 6262 being the lead-containing alloy of representative, 6262, the product performance of 6020B (not leaded) are relatively shown in table 4, table 5, table 6.
Table 4 Chemical Composition relatively
Alloy composition (%)
Trade mark Si Fe Cu Zn Bi Pb Mn Mg Cr Ti Sn
0.4- 0.15 0.4- 0.4- 0.8- 0.04-
6262 0.7 0.25 0.15 0.15
0.8 -0.4 0.7 0.7 1.2 0.14
0.4- 0.3- 0.7- 0.8-
6020B 0.5 0.35 0.10 0.1
0.9 0.9 1.2 1.3
Other performance of table 5 relatively
Alloy designations state corrosive nature plasticity-cutting ability weldability
T6 A C B B
6262
T8 A D B B
T6 A C B B
6020A
T8 A D B B
Table 6 mechanical property relatively
Alloy model state tensile strength (Mpa) yield strength (Mpa) elongation (%)
6262 T6 260 240 8
6020B T6 260 240 8
By not leaded in the 6020B alloy in the table 6, meet European Union's requirement, other performance comparison 6020B meets the requirement of 6262 alloys fully.
From the X ray material phase analysis result of the present invention by alloy, the thing phase composite of alloy is the Al matrix, Mg
2Si, Mg
2Sn and Sn.Mg wherein
2Si is the main strengthening phase of alloy, and Mg
2Sn, Sn then organize constituent for the low melting point that exists in the alloy.
The improvement of the cutting ability of lead-free free-cutting Al-Mg-Si is to realize by add Sn in alloy, because Si and Al dissolve each other hardly, therefore, Sn main combination with Mg in alloy forms Mg
2Sn and, form with Sn simple substance and to exist, its relatively disperse of distribution in alloy, by backscattered electron mutually and fracture analysis, SEM microstructure analysis, its size mostly is about 10 μ m.In cutting process, because the friction of cutter and workpiece produces a large amount of heat, the temperature of the point of contact of workpiece and cutter sharply raises, when temperature meets or exceeds the fusing point of low melting point constituent, fusing and softening can take place in this material, form tiny smear metal, thereby reach free machining purpose.
6020A metal aluminium alloy formula is carried out adjustment from the production technique of operations such as founding, homogeneous, extruding, quenching, timeliness.Guarantee product mechanical property, free cutting property, corrosion resisting property.
Claims (5)
1, a kind of manufacturing process of leadless easy-cut aluminum alloy material is characterized in that, its manufacturing technology steps is: founding-homogenizing processing-extruding-quenching-drawing-timeliness; Select for use the founding pool surface to amass little industrial furnace in the wherein founding operation, and adopt the heavy oil reverberatory smelting; Add aluminium ingot on order of addition(of ingredients) earlier, the silicon ingot that fusing point is high is added in the upper surface of aluminium ingot, adopts superfast loading, and high temperature melts fast, and smelting temperature 740-760 ℃, melting rate 4-5t/h; Flat when solid materialsization, when melt temperature rises to 740-750 ℃, to take off the interior scum silica frost of coming out of the stove and spread one deck insulating covering agent, its consumption is 3kg/m
3, the Sn ingot is sawn into the fritter of the about 20mm of thickness on sawing machine, and under the condition that flux covers, the Sn piece evenly adds in the stove; In process of production, adopt the hot ejection device of same level to carry out semicontinuous casting, adopt high temperature-slow cooling-at a slow speed-add casting technique of silk; The weight percent of the aluminum alloy materials Chemical Composition that above-mentioned technology makes is as follows: Si:0.4～0.9%, Fe:＜0.5%, Cu:0.3～0.9%, Mn:＜0.35%, Mg:0.7～1.2%, Cr:＜0.15%, Ti:＜0.10%, Sn:0.8～1.3%, surplus are inevitable impurity and Al.
2, according to the manufacturing process of described a kind of leadless easy-cut aluminum alloy material of claim 1, it is characterized in that: must thoroughly clear up empty stove in the described founding operation, carry out prepurging with the fine aluminium ingot.
3, according to the manufacturing process of described a kind of leadless easy-cut aluminum alloy material of claim 1, it is characterized in that: adopt smelting furnace that magnetic stirrer is housed in the described founding operation or fully stir and suitably improve melt temperature with drag, reduce melt viscosity, increasing is dusted and the consumption of high pure nitrogen, after refining finished, melt left standstill in stove after 20 minutes to be cast; During casting, melt adopts two-stage filtration, and prime is a multiple glazing silk cloth, and secondary is a 40PPI aluminum oxide foam ceramic filter plate.
4, the manufacturing process of a kind of leadless easy-cut aluminum alloy material according to claim 1 is characterized in that: in the homogenizing treatment process, processing parameter is under 520-560 ℃, keeps 4h-10h.
5, according to the manufacturing process of described a kind of leadless easy-cut aluminum alloy material of claim 4, it is characterized in that: in the homogenizing treatment process, processing parameter is under 540 ℃, keeps 6h.
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