CN105817604B - The extruding pressure casting method of automobile engine thin-walled aluminum alloys component - Google Patents

The extruding pressure casting method of automobile engine thin-walled aluminum alloys component Download PDF

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CN105817604B
CN105817604B CN201610416054.5A CN201610416054A CN105817604B CN 105817604 B CN105817604 B CN 105817604B CN 201610416054 A CN201610416054 A CN 201610416054A CN 105817604 B CN105817604 B CN 105817604B
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die casting
aluminum alloy
speed
casting
thin
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CN105817604A (en
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束荣辉
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Jiangsu Huasheng Electric Technology Co., Ltd.
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束荣辉
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00Pressure casting; Vacuum casting
    • B22D18/02Pressure casting making use of mechanical pressure devices, e.g. cast-forging

Abstract

The present invention relates to a kind of extruding pressure casting methods of thin-wall aluminum alloy automobile engine pump casing cover, and suitable for obtaining, air-tightness and compactness are preferable, product qualification rate is higher, shape and structure is complicated and the automobile engine pump casing cover of thin-walled.The step of extruding die casting of the extruding pressure casting method, includes:Aluminum alloy melt is conveyed from holding furnace to charging barrel of die casting machine room using quantitative tundish, Squeezing die casting machine punch steadily promotes aluminum alloy melt to mold cavity, and the process of the propulsion aluminum alloy melt includes three phases successively:First stage to squeeze die casting speed, promotes stroke to account for whole 50 60%, so that material cylinder air escape, aluminium alloy enters at a slow speed die cavity stage casing, and air escape and reduction is allowed to wrap up in gas;Second stage:For the die casting speed of horizontal plunger die casting machine, stroke is promoted to account for whole 33 43%, product is made to fill type completely with quick injection, by rapid shaping to solve cold shut;Phase III:Pressurize feeding and be compacted crystal grain, obtain spray.

Description

The extruding pressure casting method of automobile engine thin-walled aluminum alloys component
Technical field
The present invention relates to casting fields, and in particular to a kind of extruding pressure casting method of thin-walled aluminum alloys component, especially automobile The extruding pressure casting method of engine pump casing cover, cylinder head, cylinder cover etc..
Background technology
In order to it is energy-saving, reduce exhaust gas discharge, improve and drive comfort level and mechanics of vehicles performance, present automobile to Lightweight direction is developed.From the angle of structural material, it is to use to have height ratio property to realize the light-weighted main means of vehicle The light material of energy (specific strength and specific stiffness) replaces traditional material.Aluminum alloy materials are low, high than performance, protrusion with price Damping vibration attenuation performance the features such as.By aluminium alloy for vehicle structure, light weight and fuel consumption can be reduced, reduces vehicle Vibration and noise, improve the acceleration and deceleration kinetic characteristics of vehicle, can reach energy-saving and environment-friendly purpose and more significant improvement vehicle Driving comfort level.Application of the aluminium alloy on automobile is more and more, mainly using some of casting or Die Casting Housing type part and the larger functor of wall thickness, as vehicle frame, the pump housing, oil sump, air valve chamber cap, valve cage, wheel hub, oil filter base, Fuel oil seat etc..
It is most at present to be produced using aluminium alloy tradition pressure casting method for thin-wall aluminum alloy automobile engine pump casing cover, it adopts The defects of cold shut, recess, crackle etc. are different degrees of is presented in appearance with the engine pump casing cover that these traditional techniques produce, And often there is the defects of stomata, shrinkage cavity, pin hole etc. are fatal in inside, and so as to seriously affect the air-tightness of product, resistance The development of automotive light weight technology, environmental protection is hindered.That is, when the advantages of traditional die casting machine is production Complex Parts, thin-wall part, forming ability It is good, it is applied widely, but the stomata of die casting can not be effectively solved, shrinkage cavity, loose problem causes air-tightness to require high product Low qualified.
Extrusion technique be generally used for interiors of products dense structure's property with without apparent bubble is more demanding, shape and structure is opposite Better simply, thick-walled structure part(Wall thickness is generally higher than 5mm), it is complicated to forming shape, wall thickness is relatively thin, appearance, gloss have centainly It is required that thin-wall die casting(Wall thickness is generally less than 3mm)It is difficult to obtain.And conventional cold house's high pressure die casting can not be solved effectively The problems such as certainly product bubble is more, compactness is relatively low.
Above-mentioned thin-wall aluminum alloy automobile engine pump casing cover is produced using aluminium alloy extrusion casting, there is also limitation, one It is that injection speed causes mold-filling capacity insufficient slowly, complicated casting cannot fill type very well;It is second is that axial(Thickness)Dimensional accuracy is low. That is, conventional extruded casting advantage is effectively to solve the airtight sex chromosome mosaicism of die casting machine, stomata, the loose production of shrinkage cavity can be solved from source Raw condition, but a disadvantage is that mold-filling capacity is insufficient, Complex Parts, thin-wall part cannot be effectively molded.
Invention content
The technical problems to be solved by the invention are to provide a kind of extruding pressure casting method of thin-walled aluminum alloys component, and this method is fitted In obtain air-tightness and compactness preferably, product qualification rate is higher, shape and structure is complicated and the automobile engine pump casing cover of thin-walled, Cylinder head, cylinder cover etc..
In order to solve the above technical problems, the extruding pressure casting method of thin-walled aluminum alloys component provided by the invention, is pressed including squeezing The step of casting;The step includes:Aluminum alloy melt, Squeezing die casting machine are conveyed from holding furnace to charging barrel of die casting machine room using quantitative tundish Punch steadily promotes aluminum alloy melt to mold cavity, and the process of the propulsion aluminum alloy melt includes three phases successively:
First stage:Punch is promoted with the speed of 300-400mm/s(As squeeze die casting speed), stroke is promoted to account for whole process 50-60% so that material cylinder air escape, aluminium alloy enters at a slow speed die cavity stage casing, and air escape and reduction is allowed to wrap up in gas;
Second stage:Punch is to be more than 1000mm/s(It is preferred that the die casting speed of 2000-3000mm/s, as horizontal plunger die casting machine Degree)Speed promote, stroke is promoted to account for whole 33-43%, product is made to fill type completely with quick injection, by rapid shaping with Solve cold shut;
Phase III:Punch is compacted crystal grain with section more than the low-speed propulsion of 200mm/s with pressurize feeding;And in delay 5-8 The ftercompction at cast gate after second is the feeding of cast gate high-temperature region, obtains spray.
During promoting aluminum alloy melt, Squeeze Casting Parameters on Microstructure is:Squeeze pressure is 20-30MPa, the dwell time 15-20s。
As a further preference, the squeeze pressure is 25-26MPa, dwell time 17s.
A kind of extruding pressure casting method of thin-wall aluminum alloy automobile engine pump casing cover, cylinder head or cylinder cover, including The step of above-mentioned extruding die casting.
A kind of thin-wall aluminum alloy automobile engine pump casing cover, cylinder head or cylinder cover, by above-mentioned extruding pressure casting method It is made.
The technique effect of the present invention:
(1)The thin-walled aluminum alloys component of the present invention(Especially automobile engine pump casing cover, cylinder head or cylinder cover)Squeeze Press pressure casting method, using squeeze die-casting process, gathered traditional die casting and squeeze die casting respective advantageous feature, optimization melting and Squeeze the technological parameter of die casting so that the complex thin-wall automobile engine pump casing cover being fabricated has better air-tightness.Cause This, this method can improve product qualification rate to more than 95%(The product qualification rate of traditional handicraft is 40%), realize resource and the energy Low consumption, promote the raising of economic benefit;
(2)The extruding die casting of the present invention is to solve common die casting and conventional extruded casting(Liquid forging)Two technologies Existing main problem has gathered what the advantages of two techniques put forward, that is, on extrusion casting apparatus it is general with being equivalent to End extrusion process truncate product after the quick injection mo(u)lding of high speed and high pressure parameter of logical die casting, has preferable market and economy Value;
(3)The technology characteristics of extruding die casting of the present invention are:Common die-castingmold filling, extrusion casint feeding.It is in die casting It fills after type and feeding technology is squeezed by increase, to solve the air-tightness of traditional die casting generally existing(Mainly shrinkage cavity and shrinkage porosite) Quality problems eliminate various shrinkage defects.Also it can say it is the realization molding technology of complex thin-walled member on Squeezing die casting machine;
(4) automobile engine pump casing cover, cylinder head or cylinder cover is made in extruding pressure casting method using the present invention Technique effect is:1), air-tightness qualification rate:The supplier of similar product is supplied there are three to main engine plants at present, wherein Jiangsu is raised State * * companies air-leakage test is disposably 80%-85% by qualification rate, and Hubei Shiyan * * companies qualification rate is 85%-90%, he Be using the cooperation evacuated die-casting process technical matters production of 1250T tradition die casting machine, and our company uses the inventive technique technique The disposable qualification rate of air-leakage test is maintained between 97%-99% afterwards.2), air-leakage test leakage rate:Main engine plants are to the product Leak judgement standard be≤3ml/min, the certified products of first two are generally between 2.0-3.0, and our company's product testing number Value is generally between 0.5-1.5.So if to requiring tightened up high pressure air-tightness product, this technology product quality is excellent Gesture just becomes apparent from.
Description of the drawings
The present invention is described in further detail with reference to specific embodiment:
Fig. 1 is the flaw detection photo of the product of traditional die-casting process production, and there are a large amount of stomatas and loose;
Fig. 2 is another flaw detection photo of the product of traditional die-casting process production, and there are a large amount of stomatas and loose
Fig. 3 is another flaw detection photo of the product of traditional die-casting process production, and there are a large amount of stomatas and loose;
Fig. 4 is another flaw detection photo of the product of traditional die-casting process production, and there are a large amount of stomatas and loose;
Fig. 5 be it is using the present invention extruding pressure casting method production product flaw detection photo, no apparent stomata and dredge Pine;
Fig. 6 is another flaw detection photo of the product of extruding pressure casting method production using the present invention, without apparent stomata With it is loose;
Fig. 7 is another flaw detection photo of the product of extruding pressure casting method production using the present invention, without apparent stomata With it is loose;
Fig. 8 is another flaw detection photo of the product of extruding pressure casting method production using the present invention, without apparent stomata With it is loose;
Fig. 9 is another flaw detection photo of the product of extruding pressure casting method production using the present invention, without apparent stomata With it is loose;
Figure 10 is another flaw detection photo of the product of extruding pressure casting method production using the present invention, without apparent stomata With it is loose.
Specific embodiment
Embodiment 1(1250T bedrooms extruder production casting)
The extruding pressure casting method of the thin-wall aluminum alloy automobile engine pump casing cover of the present embodiment, including:Following steps:
1) material composition:The weight percent of aluminum alloy materials component is:9.6-12%Si, 1.5-3.5%Cu, Mg≤ 0.3%, Mn≤0.5, Fe≤1.3%, Zn≤1%, Ni≤0.5%, Sn≤0.3%, Pb≤0.3, Ti≤0.2, remaining is Al.
2) melting:Aluminum alloy materials are launched into crucible furnace, molten aluminum solution temperature is made to reach 720 DEG C -750 DEG C, per stove A degasifier and 300 grams of deslagging agents are launched, refining after ten minutes is completed, and soup temperature is controlled out to be maintained at 720 DEG C -750 DEG C, fortune After going to holding furnace, control temperature of aluminum liquid is at 670 DEG C -680 DEG C.(As a kind of scheme of modification, melting:By aluminum alloy materials Virgin material and old material press 50%:50% launches into crucible furnace, and molten aluminum solution temperature is made to reach 720 DEG C -750 DEG C, and one is launched per stove Degasifier and 300 grams of deslagging agents, after ten minutes refining are completed, and soup temperature are controlled out to be maintained at 720 DEG C -750 DEG C, operating to heat preservation After stove, control temperature of aluminum liquid is at 670 DEG C -680 DEG C.)
3) prepare mold:Mold is fixed on extrusion casting machine, is first preheated barrel 3 times(With molten aluminum 670-690 DEG C, barrel is sent into, is solidified after 30-60s, is re-fed into molten aluminum after ejection manually), open cooling water so that mold reaches thermal balance 150-180 DEG C, last layer releasing agent is uniformly sprayed after each depanning in mold cavity, releasing agent thinner ratio is 1:80, releasing agent The thickness of coating is 20-25 microns.The releasing agent trade mark is China open country 935.
4) die casting is squeezed:Aluminum alloy melt, Squeezing die casting machine are conveyed from holding furnace to charging barrel of die casting machine room using quantitative tundish Punch steadily promotes aluminium alloy to mold cavity, and forming process hereafter mainly divides the three phases of three friction speeds:1st, expect After cylinder air escape aluminium alloy enter at a slow speed die cavity stage casing, 2, quick injection make product fill completely type, 3, at a slow speed pressurize be compacted Crystallization, and add local ftercompction after postponing 5-8 seconds.Completed under the parameter setting of the slow extruding+ftercompction of slow-motion chamber-fast charging type- The whole press casting procedure of 700mm.Adjusting Squeeze Casting Parameters on Microstructure is:Squeeze pressure is 25-26MPa, and punch extrusion speed divides Section is adjusted, first segment, with the speed of 300-400mm/s(As squeeze die casting speed)It is slowly advanced and accounts for whole 55%, allow air Gas is wrapped up in escape and reduction;Second segment, with the speed of 2000mm/s(The as die casting speed of horizontal plunger die casting machine), promote and account for whole process 38%, rapid shaping is to solve cold shut;Third section, with the low speed of 200mm/s, section more than propulsion is compacted crystal grain with pressurize feeding; Pressurized is implemented after 5s is postponed, predominantly the feeding of cast gate high-temperature region.The thin-wall aluminum alloy automobile engine pump housing is completed in this way The casting process of lid obtains the spray of dense structure.
1250T bedrooms extruder produces the parameter of above-mentioned casting
Embodiment 2
On the basis of embodiment 1, the present embodiment has following modification:
Material composition:Si6.5-8.5%, Cu1.5-2.0%, Mn0.1-0.4%, Mg0.8-1.2%, Zn < 0.1, Ti0.1-0.35%, remaining be aluminium.
Embodiment 3
On the basis of embodiment 1, the present embodiment has following modification:
Material composition:6-8%Al, 0.17-0.4%Mn, 0.45-0.9%Zn, 0.8-1.2%RE, 1.5-2.5%Ti, Si < 0.05%, Cu < 0.025, Ni < 0.001%, Fe < 0.004%, remaining is Mg.
The extruding pressure casting method of cylinder cover of automobile engine or cylinder cover is identical with above-mentioned 3 embodiments.
Obviously, the above embodiment is merely an example for clearly illustrating the present invention, and is not to the present invention The restriction of embodiment.For those of ordinary skill in the art, it can also be made on the basis of the above description Its various forms of variation or variation.There is no necessity and possibility to exhaust all the enbodiments.And these belong to this hair The obvious changes or variations that bright spirit is extended out are still in the protection scope of this invention.

Claims (3)

1. a kind of extruding pressure casting method of thin-walled aluminum alloys component, the step of including squeezing die casting;It is characterized in that the extruding die casting The step of include:Aluminum alloy melt is conveyed from holding furnace to charging barrel of die casting machine room using quantitative tundish, Squeezing die casting machine punch is to mould Tool cavity steadily promotes aluminum alloy melt, and the process of the propulsion aluminum alloy melt includes three phases successively:
First stage:Punch is promoted with the speed of 300-400mm/s, as squeezes die casting speed;Stroke is promoted to account for whole 50- 60%, so that material cylinder air escape, aluminium alloy enters at a slow speed die cavity stage casing, and air escape and reduction is allowed to wrap up in gas;
Second stage:Punch is promoted with the speed of 2000-3000mm/s, as the die casting speed of horizontal plunger die casting machine;Promote stroke Whole 33-43% is accounted for, product is made to fill type completely with quick injection, by rapid shaping to solve cold shut;
Phase III:Punch is compacted crystal grain with pressurize feeding, is obtained spray with section more than the low-speed propulsion of 200mm/s;
After completing the phase III, postpone 5-8 seconds, the then ftercompction at cast gate is the feeding of cast gate high-temperature region;
During the propulsion aluminum alloy melt, Squeeze Casting Parameters on Microstructure is:Squeeze pressure is 20-30MPa, the dwell time 15-20s。
2. a kind of extruding pressure casting method of thin-wall aluminum alloy automobile engine pump casing cover, cylinder head or cylinder cover, including such as The step of extruding die casting described in claim 1.
3. a kind of thin-wall aluminum alloy automobile engine pump casing cover, cylinder head or cylinder cover, by as described in claim 1 Pressure casting method is squeezed to be made.
CN201610416054.5A 2013-08-30 2013-08-30 The extruding pressure casting method of automobile engine thin-walled aluminum alloys component Active CN105817604B (en)

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CN201310391347.9A CN104384471B (en) 2013-08-30 2013-08-30 The extruding pressure casting method of a kind of thin-wall aluminum alloy motor car engine pump housing lid
CN201610416054.5A CN105817604B (en) 2013-08-30 2013-08-30 The extruding pressure casting method of automobile engine thin-walled aluminum alloys component

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CN109622914A (en) * 2018-11-30 2019-04-16 江苏文灿压铸有限公司 A kind of die-casting process of automobile speed variator
CN109877289B (en) * 2019-01-29 2021-08-24 东莞捷荣技术股份有限公司 Seven-series aluminum alloy small part and die casting method thereof

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CN100423872C (en) * 2006-11-16 2008-10-08 上海交通大学 Extrusion casting preparation method for aluminium alloy automobile engine bracket
CN102861895A (en) * 2011-07-07 2013-01-09 吴玉荣 Ultra-large type thin-wall complex part die-casting process

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