CN102699305A - Method for quickly cold die-casting aluminium alloy shell - Google Patents
Method for quickly cold die-casting aluminium alloy shell Download PDFInfo
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- CN102699305A CN102699305A CN2012101725875A CN201210172587A CN102699305A CN 102699305 A CN102699305 A CN 102699305A CN 2012101725875 A CN2012101725875 A CN 2012101725875A CN 201210172587 A CN201210172587 A CN 201210172587A CN 102699305 A CN102699305 A CN 102699305A
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Abstract
The invention discloses a method for quickly cold die-casting an aluminium alloy shell, which comprises material selecting, material smelting, material refining, degassing with high purity argon after the refining, automatic spraying within a die and ultra-low speed casting of liquid material. Through a modern simulation mode (mold flow analysis), the development cost is greatly lowered, the product percent of pass is high, the porosity is better than a common technological design, the product filling process is stable, the quality is improved, the service life of the die is also improved to a great extent, moreover, the automation is adopted, the manpower and time are greatly saved, and the precision and yield of the product are improved.
Description
Technical field
The present invention relates to casting field, relate in particular to a kind of Al-alloy casing speed casting casting method of colding pressing.
Background technology
Existing this type of length grow thin production of (product length 570mm, diameter 40mm, wall thickness 3-5mm) and wall thickness mainly with gravity casting or be die cast as the master, in the technology implementation process, controls single.The gravity casting shortcoming: 1. the product feeding is difficult, and easy formation is loosened or shrinkage cavity defect causes product percent of pass low; 2. the weight of product weight under the extrusion process causes raw-material waste; 3. productive temp is slow, can not satisfy the production capacity requirement.Present shortcoming is produced in die casting: 1. it is poor that the production efficiency height causes fusion process control, and aluminium liquid does not have the refinement and denaturation process, and the thick product mechanical performance that causes of crystal grain is not up to standard; 2. technical process control human factor is too many, and automation is not enough, causes product distortion and blemish more.
Summary of the invention
The present invention is just in order to overcome above-mentioned deficiency, and technical problem to be solved provides a kind of Al-alloy casing speed casting casting method of colding pressing, and can make that product grains is tiny, mechanical performance improves, and qualification rate improves greatly.
For solving the problems of the technologies described above, the technical scheme that the present invention adopted is following: a kind of Al-alloy casing speed casting casting method of colding pressing comprises the steps:
(1) chooses the material of big cam shaft-cup: silicon Si, magnesium Mg, iron Fe, copper Cu, manganese Mn, nickel, zinc Zn, plumbous Pb, tin Sn; Titanium Ti, chromium Cr, aluminium Al;
(2) with more than the smelting furnace heat temperature raising to 600 ℃, in burner hearth, add material described in (1), continue heating, when treating that material is warming up to 720 ℃ ± 10 ℃, the three-in-one refining agent that adds consumption and be material 0.1%～0.8% carries out refining; Can guarantee full and uniform in aluminium liquid, the having an effect of alterant like this with solution; Accomplish the purification and the crystal grain thinning processing of aluminium liquid; This method has guaranteed that aluminium liquid degree of purity and crystal grain are tiny; It is about 10% that product strength improves, and reaches the product design requirement, and the aluminium liquid that purifies has simultaneously fully reduced dreg defect in the foundry goods;
(3) with bell jar refining agent is pressed into the middle circumference that carries out of material liquid and stirred 5～15 minutes, adopt argon gas to carry out degas operation 3～20 minutes, obtain material liquid after skimming, preparation die casting in static 8～12 minutes;
(4) adjustment cooling water pressure to 2～6Mpa, and hydraulic oil pipe pressure to 6～12Mpa connects the mould automatic temp controller;
(5) mould with a mould two chambeies is fixed on the active and inactive mold plate of die casting machine, with mould and die preheating to 160～250 ℃, in mold cavity, evenly sprays one deck water based paint, and the type thickness of being coated with is 0.005～0.008mm, heating and to keep mold temperature be 200～300 ℃;
(6) adjustment spraying apparatus makes the spraying path can cover mold cavity comprehensively, and adjusting the fuse position spraying time of staying simultaneously is 3s;
(7) material hydraulic pressure is gone in the mould, carry out Ultra-Low Speed die casting, die casting obtains product after finishing.
The each component percentage by weight is in the said step 1: silicon Si is 8.0%～11.0 %, and magnesium Mg is 0.05%～0.55%, and iron Fe≤1.3%, copper Cu are 2.0～4.0%, manganese Mn≤0.55%, nickel≤0.55%, zinc Zn≤1.2%, plumbous Pb≤0.35%, tin Sn≤0.25%; Titanium Ti≤0.25%, chromium Cr≤0.15%, all the other are aluminium Al.
Smelting furnace heat temperature raising to 600 ℃ in the said step (2)～700 ℃.
Three-in-one refining agent is the nontoxic refining agent of magnificent treasure powdery in the said step (2), has reduced the injury to human body.
Purity of argon is 99.99% in the said step (3).
Spraying apparatus is an auto spraying equipment in the said step (6); Make in the die lubricant spraying more even; The time of also having avoided causing owing to the hand spray material longer and occur easily spray paint too much cause coating before die casting fully scaling loss influence the product internal soundness.Also improved simultaneously production efficiency nearly 20% greatly.
The technological parameter of Ultra-Low Speed die casting is in the said step (7): system pressure is 12～15MPa; The pressurization time wheel is adjusted to the 2-6 circle, and gassing time is 3～5s, and cast temperature is 650～700 ℃; High speed position die casting speed is less than 5m/s, and the foundry goods mould remaining time is set at 10～20s.
The mould temperature is the key factor that influences casting quality; Comprise inside and presentation quality, temperature control uses die heater to control in real time, mould attend that local cooling uses the time water-cooled but; Hydraulic pressure is controlled at 4-8Mpa; Used simultaneously the Ti32 thermal imaging system that mold temperature is carried out strictness in process of production and detected, the mould temperature control has greatly guaranteed the product internal soundness between 140-220 ℃.
Beneficial effect: the present invention has greatly reduced development cost through modernized simulation means (mold flow analysis), and product percent of pass is high; Voidage is superior to the common process design, and the product cavity filling process is stable, has not only improved quality; The life-span of improving mould to a great extent simultaneously; And owing to adopted automation, saved manpower and time greatly, improved the precision and the qualification rate of product.
The specific embodiment
Below in conjunction with specific embodiment, further illustrate the present invention, present embodiment is being to implement under the prerequisite with technical scheme of the present invention, should understand these embodiment only be used to the present invention is described and be not used in the restriction scope of the present invention.
Embodiment 1: a kind of Al-alloy casing speed cold pressing the casting casting method comprise the steps:
(1) choose the material of big cam shaft-cup, be respectively by weight percentage: silicon Si is 8.0%, and magnesium Mg is 0.05%, and iron Fe is 0.1%, and copper Cu is 2.0, and manganese is Mn0.1%, and nickel is 0.2%, and zinc Zn is 1%, and plumbous Pb is 0.15%, and tin Sn is 0.05%; Titanium Ti is 0.2%, and chromium Cr is 0.05%, all the other are aluminium Al%.
(2) with smelting furnace heat temperature raising to 600 ℃, in burner hearth, add material described in (1), continue heating, when treating that material is warming up to 720 ℃, adding consumption is the nontoxic refining agent refining of magnificent treasure powdery of material 0.1%;
(3) with bell jar refining agent is pressed into and carries out circumference in the middle of the material liquid and stirred 5 minutes, adopting purity is that 99.99% argon gas carried out degas operation 3 minutes, obtains material liquid after skimming, and prepares die casting in static 8 minutes;
(4) adjust cooling water pressure to 2Mpa, and hydraulic oil pipe pressure is connected the mould automatic temp controller to 6Mpa;
(5) mould with a mould two chambeies is fixed on the active and inactive mold plate of die casting machine, with mould and die preheating to 160 ℃, in mold cavity, evenly sprays one deck water based paint, and the type thickness of being coated with is 0.005mm, heating and to keep mold temperature be 200 ℃;
(6) adjustment auto spraying equipment makes the spraying path can cover mold cavity comprehensively, and adjusting the fuse position spraying time of staying simultaneously is 3s;
(7) material hydraulic pressure is gone in the mould, carry out Ultra-Low Speed die casting, system pressure is 12MPa; The pressurization time wheel is adjusted to 2 circles, and gassing time is 3s, and cast temperature is 650 ℃; High speed position die casting speed is 4.5m/s, and the foundry goods mould remaining time is set at 10s, and die casting obtains product after finishing.
Embodiment 2: a kind of Al-alloy casing speed cold pressing the casting casting method comprise the steps:
(1) choose the material of big cam shaft-cup, be respectively by weight percentage: silicon Si is 11.0 %, and magnesium Mg is 0.55%, and iron Fe is 1.3%, and copper Cu is 4.0%, and manganese Mn is 0.55%, and nickel is 0.55%, and zinc Zn is 1.2%, and plumbous Pb is 0.35%, and tin Sn is 0.25%; Titanium Ti is 0.25%, and chromium Cr is 0.15%, all the other are aluminium Al%.
(2) with smelting furnace heat temperature raising to 700 ℃, in burner hearth, add material described in (1), continue heating, when treating that material is warming up to 730 ℃, adding consumption is the nontoxic refining agent refining of magnificent treasure powdery of material 0.8%;
(3) with bell jar refining agent is pressed into and carries out circumference in the middle of the material liquid and stirred 15 minutes, adopting purity is that 99.99% argon gas carried out degas operation 20 minutes, obtains material liquid after skimming, and prepares die casting in static 12 minutes;
(4) adjust cooling water pressure to 6Mpa, and hydraulic oil pipe pressure is connected the mould automatic temp controller to 12Mpa;
(5) mould with a mould two chambeies is fixed on the active and inactive mold plate of die casting machine, with mould and die preheating to 250 ℃, in mold cavity, evenly sprays one deck water based paint, and the type thickness of being coated with is 0.008mm, heating and to keep mold temperature be 300 ℃;
(6) adjustment auto spraying equipment makes the spraying path can cover mold cavity comprehensively, and adjusting the fuse position spraying time of staying simultaneously is 3s;
(7) material hydraulic pressure is gone in the mould, carry out Ultra-Low Speed die casting, system pressure is 15MPa; The pressurization time wheel is adjusted to the 2-6 circle, and gassing time is 5s, and cast temperature is 700 ℃; High speed position die casting speed is 1m/s, and the foundry goods mould remaining time is set at 20s, and die casting obtains product after finishing.
Embodiment 3: a kind of Al-alloy casing speed casting casting method of colding pressing comprises the steps:
(1) choose the material of big cam shaft-cup: silicon Si is 9.0%, and magnesium Mg is 0.4%, and iron Fe is 0.9%, and copper Cu is 3.0%, and manganese Mn is 0.25%, and nickel is 0.3%, and zinc Zn is 0.8%, and plumbous Pb is 0.2%, and tin Sn is 0.08%; Titanium Ti is 0.16%, and chromium Cr is 0.09%, all the other are aluminium Al%;
(2) with smelting furnace heat temperature raising to 650 ℃, in burner hearth, add material described in (1), continue heating, when treating that material is warming up to 710 ℃, the three-in-one refining agent that adds consumption and be material 0.5% carries out refining;
(3) with bell jar refining agent is pressed into and carries out circumference in the middle of the material liquid and stirred 10 minutes, adopting purity is that 99.99% argon gas carried out degas operation 1020 minutes, obtains material liquid after skimming, and prepares die casting in static 10 minutes;
(4) adjust cooling water pressure to 4Mpa, and hydraulic oil pipe pressure is connected the mould automatic temp controller to 8Mpa;
(5) mould with a mould two chambeies is fixed on the active and inactive mold plate of die casting machine, with mould and die preheating to 200 ℃, in mold cavity, evenly sprays one deck water based paint, and the type thickness of being coated with is 0.006mm, heating and to keep mold temperature be 250 ℃;
(6) adjustment auto spraying equipment makes the spraying path can cover mold cavity comprehensively, and adjusting the fuse position spraying time of staying simultaneously is 3s;
(7) material hydraulic pressure is gone in the mould, carry out Ultra-Low Speed die casting, system pressure is 13MPa, and the pressurization time wheel is adjusted to 4 circles, and gassing time is 4s, and cast temperature is 680 ℃, and high speed position die casting speed is 3m/s, and the foundry goods mould remaining time is set at 15s.Die casting obtains product after finishing.
Embodiment 4: a kind of Al-alloy casing speed casting casting method of colding pressing comprises the steps:
(1) choose the material of big cam shaft-cup: silicon Si is 9.0 %, and magnesium Mg is 0.4%, and iron Fe is 1.1%, and copper Cu is 3.5%, and manganese Mn is 0.35%, and nickel is 0.23%, and zinc Zn is 0.09%, and plumbous Pb is 0.10%, and tin Sn is 0.23%; Titanium Ti is 0.19%, and chromium Cr is 0.11%, all the other are aluminium Al.
(2) with smelting furnace heat temperature raising to 680 ℃, in burner hearth, add material described in (1), continue heating, when treating that material is warming up to 720 ℃, the three-in-one refining agent that adds consumption and be material 0.6% carries out refining;
(3) with bell jar refining agent is pressed into the middle circumference that carries out of material liquid and stirred 12 minutes, adopting purity is that 99.99% argon gas carried out degas operation 15 minutes, obtains material liquid after skimming, preparation die casting in static 11 minutes;
(4) adjust cooling water pressure to 5Mpa, and hydraulic oil pipe pressure is connected the mould automatic temp controller to 9Mpa;
(5) mould with a mould two chambeies is fixed on the active and inactive mold plate of die casting machine, with mould and die preheating to 230 ℃, in mold cavity, evenly sprays one deck water based paint, and the type thickness of being coated with is 0.007mm, heating and to keep mold temperature be 230 ℃;
(6) adjustment auto spraying equipment makes the spraying path can cover mold cavity comprehensively, and adjusting the fuse position spraying time of staying simultaneously is 3s;
(7) material hydraulic pressure is gone in the mould, carry out Ultra-Low Speed die casting, system pressure is 14MPa; The pressurization time wheel is adjusted to 3 circles, and gassing time is 4s, and cast temperature is 690 ℃; High speed position die casting speed is 2m/s, and the foundry goods mould remaining time is set at 14s, and die casting obtains product after finishing.
Claims (7)
1. Al-alloy casing speed casting casting method of colding pressing is characterized in that it comprises the steps:
(1) chooses the material of big cam shaft-cup: silicon Si, magnesium Mg, iron Fe, copper Cu, manganese Mn, nickel, zinc Zn, plumbous Pb, tin Sn; Titanium Ti, chromium Cr, aluminium Al;
(2) with more than the smelting furnace heat temperature raising to 600 ℃, in burner hearth, add material described in (1), continue heating, when treating that material is warming up to 720 ℃ ± 10 ℃, the three-in-one refining agent that adds consumption and be material 0.1%～0.8% carries out refining;
(3) with bell jar refining agent is pressed into the middle circumference that carries out of material liquid and stirred 5～15 minutes, adopt argon gas to carry out degas operation 3～20 minutes, obtain material liquid after skimming, preparation die casting in static 8～12 minutes;
(4) adjustment cooling water pressure to 2～6Mpa, and hydraulic oil pipe pressure to 6～12Mpa connects the mould automatic temp controller;
(5) mould with a mould two chambeies is fixed on the active and inactive mold plate of die casting machine, with mould and die preheating to 160～250 ℃, in mold cavity, evenly sprays one deck water based paint, and the type thickness of being coated with is 0.005～0.008mm, heating and to keep mold temperature be 200～300 ℃;
(6) adjustment spraying apparatus makes the spraying path can cover mold cavity comprehensively, and adjusting the fuse position spraying time of staying simultaneously is 3s;
(7) material hydraulic pressure is gone in the mould, carry out Ultra-Low Speed die casting, die casting obtains product after finishing.
2. according to the said a kind of Al-alloy casing speed of the claim 1 casting casting method of colding pressing, it is characterized in that: the each component percentage by weight is in the said step 1: silicon Si is 8.0%～11.0 %, and magnesium Mg is 0.05%～0.55%; Iron Fe≤1.3%, copper Cu are 2.0～4.0%, manganese Mn≤0.55%; Nickel≤0.55%; Zinc Zn≤1.2%, plumbous Pb≤0.35%, tin Sn≤0.25%; Titanium Ti≤0.25%, chromium Cr≤0.15%, all the other are aluminium Al.
3. according to the said a kind of Al-alloy casing speed of the claim 1 casting casting method of colding pressing, it is characterized in that: smelting furnace heat temperature raising to 600 ℃ in the said step (2)～700 ℃.
4. according to the said a kind of Al-alloy casing speed of the claim 1 casting casting method of colding pressing, it is characterized in that: three-in-one refining agent is the nontoxic refining agent of magnificent treasure powdery in the said step (2).
5. according to the said a kind of Al-alloy casing speed of the claim 1 casting casting method of colding pressing, it is characterized in that: purity of argon is 99.99% in the said step (3).
6. according to the said a kind of Al-alloy casing speed of the claim 1 casting casting method of colding pressing, it is characterized in that: spraying apparatus is an auto spraying equipment in the said step (6).
7. according to the said a kind of Al-alloy casing speed of the claim 1 casting casting method of colding pressing; It is characterized in that: the technological parameter of Ultra-Low Speed die casting is in the said step (7): system pressure is 12～15MPa; The pressurization time wheel is adjusted to the 2-6 circle, and gassing time is 3～5s, and cast temperature is 650～700 ℃; High speed position die casting speed is less than 5m/s, and the foundry goods mould remaining time is set at 10～20s.
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| CN103302264A (en) * | 2013-05-22 | 2013-09-18 | 王金水 | High-density die-casting molding method for an aluminium alloy cast of hydraulic brake pump casing body of an automobile |
| CN103658583A (en) * | 2013-12-10 | 2014-03-26 | 常熟柏科汽车零件再制造有限公司 | Aluminum alloy shell fast-cooling die casting method |
| CN103878338A (en) * | 2014-03-19 | 2014-06-25 | 宁波东浩铸业有限公司 | Technology for machining automobile engine end cover |
| CN104353801A (en) * | 2014-10-20 | 2015-02-18 | 常州大学 | Die-casting process of aluminum alloy bracket |
| CN104841904A (en) * | 2015-04-13 | 2015-08-19 | 东莞沙头朝日五金电子制品有限公司 | Casting method for aluminum alloy hardware |
| CN104878258A (en) * | 2015-05-20 | 2015-09-02 | 柳州市百田机械有限公司 | Preparation method of high-strength die casting aluminium alloy |
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| CN103302264A (en) * | 2013-05-22 | 2013-09-18 | 王金水 | High-density die-casting molding method for an aluminium alloy cast of hydraulic brake pump casing body of an automobile |
| CN103658583A (en) * | 2013-12-10 | 2014-03-26 | 常熟柏科汽车零件再制造有限公司 | Aluminum alloy shell fast-cooling die casting method |
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