Aluminous silicon copper alloy asks to what Die Casting model designs

Key Words:ACopper alloy of aluminous silicon of 　 of L-Si-Cu Alloy;Die Casting Mould;Fit Clearance;Midway Anneal is the Die Casting aluminium alloy of a kind of high strenth, it is common aluminum-silicon alloy (such as: The YL101 of our country, YL102) branch. But because aluminous silicon copper alloy is opposite at common aluminum-silicon alloy character, have good fill sex, because this is when mould design, the make choice of that to its Die Casting model cooperates clearance cannot all is used agree with what character of common aluminum-silicon alloy recommends cooperate clearance. The fill sex of aluminous silicon copper alloy compares the fill sex of common aluminum-silicon alloy to be close friends more. For example, spare parts of body of the Bao Bi of figuration of some factory Die Casting, case, its material is A380 alloy (one of commercial names of copper alloy of American aluminous silicon, the model that is aluminous silicon copper alloy represents) , following plan institute show its structure, measure: Case form muscle section dimension is 1.

5mm × 2.

5mm, this part is the smallest at the same time the wall is large it is only 0.

77mm. Die Casting structural diagram author thinks: The fill sex that the Die Casting figuration of this spare parts says adequately to understand aluminous silicon copper alloy (namely fluidity) good, it not only excel is common aluminum-silicon alloy, and fall in the remelting craft that accords with its character and condition of Die Casting craft, make fill sex even the fill sex of ZZnA14-1 of no less than zincic aluminium alloy. And stylist of mould of current Die Casting is right the fill sex of ZZnA14-1 of zincic aluminium alloy and the coordinate clearance control to model of its Die Casting already had enough understanding and rich experience. The prime cause with the mechanical function of aluminum-silicon alloy and fill good performance depends on his chemical composition and to it the fusion craft that chemical composition photograph gets used to and Die Casting craft. The chemical composition of copper alloy of aluminous silicon of each country model and mechanical function, see next tables. The chemical composition that expresses copper alloy of aluminous silicon of each country model and mechanical function alloy are main chemical composition (≤ ％ ) foreign matter (≤ ％ ) mechanical function SiCuMgMnAlFeZnSnNiPbTi is other Ab/MPa δ / A3807 of ％ United States.

5 ～ 9.

53.

0 ～ 4.

00.

10.

5 surplus 2.

03.

00.

350.

50.

1 　 0.

53202.

5 Japan ADC102.

0 ～ 4.

00.

31.

31.

00.

　 of 3 　 　 3303.

5 Germany GD-Al-Si8-Cu32.

0 ～ 3.

50.

2 ～ 0.

51.

20.

10.

30.

20.

150.

153103.

0 England LM24-M3.

0 ～ 4.

00.

53.

00.

20.

50.

30.

2 　 3202.

　 of 0 China Y112 1.

21.

20.

10.

50.

1 　 　 2401.

The main element with mechanical to aluminous silicon copper alloy function and fill function bigger impact has 0 　 : (The content of 1) silicon is very high, be in commonly 7% ～ 18% between. When high temperature, form in all crystal, the modelling sex when can improving alloy high temperature [1] . Foreign scholar also thinks, high crystallization latent heat is corresponding high liquidity, in all can fuse with aluminium in the element of alloy, silicon has highest latent heat to be worth, beryllium is to have taller than silicon latent heat exclusive alloying element, but the use amount of beryllium is very small, the latent heat that it fastens to alloy affects as a result not apparent [2] . (The content of element of 2) copper coin is very high also, the cupreous content of the aluminous silicon copper alloy of all sorts of different names basically is in 1.

5% ～ 5.

Inside the limits of 0% . Inside alloy with in all crystal (the form of α ＋ CuAl2) exists, can increase the liquidity of alloy fluid. (More or less does the aluminous silicon copper alloy of 3) different name contain zinc, some is as high as 3% even. Because cupreous content is higher, the content that because this allows,raises zinc appropriately [1] . The liquidity of zincic itself is particularly good also. (In 4)Die Casting process, be opposite to reduce alloy fluid the conglutinate of the mould, can allow the iron element that existence measures certainly, to reduce the ill effect of iron, can join a few manganese element and iron are counteracted, the crystal appearance the iron in alloy from piece shape or acicular turn close crystal into appearance (the organization of Chinese character glyph) [1] . Containing above because of aluminous silicon copper alloy the element of sexes of a variety of ameliorable alloy fill and mechanical function, theoretic its fill sex and tensile strength should very good, practice also proved its have admirable fill sex and high strength, just be used extensively at Die Casting production so. What have some better stuff sexes in the light of aluminous silicon copper alloy, when Die Casting model is designed, to its figuration spare parts (spare parts of so-called pattern figuration is the part that the contact produces with fluid of high temperature alloy in showing the mould is working, besides figuration cast model antrum and model outside core, it still includes to irrigate a system, top to go out component and the component that smoke core, press when combining a model whether activity, can divide again for mobile figuration spare parts and fixed figuration spare parts) cooperate clearance choose, cannot blind day recommends a value according to what move concerned document [1, 3] . About the commendation of document the value is opposite aluminum-silicon alloy is basic and applicable, but the fill sex of aluminous silicon copper alloy is first-rate, 0.

The Bao Bi of 7mm can Die Casting comes out, spare parts of figuration of Die Casting model cooperates clearance to get strict control certainly. Because spare parts of figuration of Die Casting model cooperates clearance,this is to Die Casting model service life is mixed Die Casting the impact of quality is very big. When the job, if let change of fluid of high temperature alloy cooperate clearance into these, will cause cast drawing of patterns, top to give difficulty, and the flash that was not kept clear of clean and burr, remain is in mould clearance, block up the flexibility of the mould replies, it is the possibility that raised alloy fluid change to enter space more. These flash from time to time remain, from time to time is given by casting tape, such vicious circle, what bring about a mould finally is local be out of shape, shrivelled collapses, cannot have normal production and must discard as useless mould; And of spare parts of figuration of Die Casting model cooperate gap look opposite big, flash and burr are much, affect Die Casting already exterior quality, the foreword after increasing again machines the workload of working procedure. Be based on the possibility that reduces change of fluid of high temperature alloy to cooperate clearance into mould figuration spare parts, the foreword after reducing machines the workload of flash of working procedure purify, burr, with the consideration that prolongs mould service life, the author recommends: No matter whether is dimension of nominal of mould figuration spare parts compared big, also no matter whether it attributes mobile figuration part, their unilateral cooperates clearance value to should be controlled in 0.

06mm(this numerical value already had considered a mould to lie below the high temperature of 600 ℃ , the heat of the mould expands the value influence to cooperating clearance) inside limits, only such, alloy fluid not easy change enters ability in these clearance. In producing practice, ejector pin may happen to carry a difficulty and the circumstance of the difficulty that smoke core on the head when combining a model, because error of appearance of figuration spare parts is big,this is, the top goes out, dot of the exert oneself that smoke core is lopsided cause. Appearance error is too big, or the top goes out, dot of the exert oneself that smoke core is lopsided, all can cause figuration part to at the same time askew, such at the same time clearance decreases, and the clearance of across expands, make the chance that alloy fluid change enters increases. Alloy fluid once change enters space, figuration spare parts is squashed, mobile figuration spare parts is died by card, open nature combining a model not agile, people often considers as this kind of phenomenon by accident cooperate the reason with too little space. How does stable and control, logical pattern cooperate clearance? The author thinks to need from proceed with of the following respects: (1) is right stylist of Die Casting model, because Die Casting model is odd commonly a production, not tall to the requirement of interchangeability, because this answers to set out from the craft character of aluminous silicon copper alloy, it is premise in order to make sure figuration spare parts cooperates clearance reasonably, and the rationality that give attention to two or morethings makes treatment and economy, by base aperture makes a principle, through the axis kind the production public errand of the spare parts will make sure its cooperate clearance. (Because 2) is in in process of Die Casting production, mould not only be in high temperature to fall, and temperature change is big. Although mould material (the linear expansion value of H13, 3Cr2W8V) is not great, but also should not ignore completely. Should use a pattern so lukewarm accuse device to come to those who stabilize mould figuration spare parts cooperate clearance, it is OK to be returned at the same time slow down because temperature change is frequent and the chap that cause and improve productivity. (3) to extend Die Casting pattern service life, remove the measure of spare parts of internal stress, stable figuration, the proposal adopts intermediate anneal, among its anneal craft [4] as follows: New mould pressing fires fixed number, namely 3 000 of 1 000 ～ second hind, undertake anneal; Press again shot 5 000 second hind, undertake anneal again; Press again shot 10 000 second hind, again anneal; Should press shot 50 000 second hind, the pattern is steadier. Intermediate anneal craft: 540 ℃ , 5h, along with furnace refrigeration. Aluminous silicon copper alloy is aluminium alloy of current and accepted Die Casting of a kind of high strenth, abroad applies extensively already at spare parts of crust, electric home appliancesCNC Milling