Fig. 9. The three contraction stages are modeled.
ІЗ收ঢ়阶段ङ建模温 ֣ ℃ چ
overheating of the alloy; solidification contraction that relies on the solidification range of the alloy; and the solid phase contraction. The feeding system can exert influ- ence on the first two, while the third obeys the physical behavior of the alloy and it is not possible to change it noticeably.
• Thermal modulus. It is one of the design key points and thus, the modulus of both the part and the feeding system are studied with the safety factor set around 25% (MFeed- ing > 1,25MPart). In the course of the “SUPERALLOY” project, novel
design concepts have been handled, considering that “a single cast component must be treated as if it was a series produc- tion part.” Tis preliminary approach introduces important design novelties making the use of simulation tools essential. Part soundness (absence of shrinkage porosity) has been
considered a key point both in laboratory scale and in indus- trial productions. In all cases, subsequent adjustments have been carried out taking the conventional designs as reference. For virtual validations, several moduli are employed performing defect prediction calculations for all cases. In order to minimize the impact of incidences in indus-
trial parts, every single design change has been preceded by the fabrication of the corresponding specimens. Te specimens used were prismatic blocks of side = 200mm and geometric modulus = 3.33cm (Fig. 2). Te feeder of every specimen is built with the riser sleeves under study, analyzing the results in terms of characteristic contraction model followed by all cases. Both destructive and non-destructive techniques are
employed to assess the soundness and the amount of contrac- tion in every specimen.
Industrial Trials
All the validations have had to undergo their correspond- ing industrial trials (Fig. 3), where soundness and net/gross yield are inspected. Te preliminary requirement has been, in all cases, guar- anteeing the part’s soundness and no melt was carried out assuming unnecessary risks. Te basis of this article is the optimization of the yield
数模ङ统系ঢ়੭չў铸९ू֨৲֜，点键ҼЗ 左右（3੭ঢ়系统 ֨定ગ数系Ҷ安ر需时 $ 3铸ў）。
ৰਖ਼ӱȔ每З单独ङ铸ў都应ੴ当成需要批量生фङ 一д用҅ЭИ३过ङऩ项ȕ金合级超Ȕ੧进֨，ȕў铸 п新颖ङગઋ概念。ӯ用模拟工Ӏ，运用这一初步方法 。ઋગר新ङ要重ךકдҵ引 有没（性ױ完ङў铸，И模ઁЏ工是还室验实֨ખ无
ગ统Ѯљ都И子҆有۱֨。标指ङ要重是都）松ঢ়孔ঢ় ઋОՀৰ进੧дե续ङલ整。ҁОਗ਼拟ेઍ，还҅用д 。算ઋ测预陷缺੧进子҆有۱ث数模п一 次每，ր影ङў铸Џ工ث率生Շ陷缺شӗ量ـдО
Оў样。ў样ङ应ब造Ӳүѫ都ӹ动Պ੧进ઋગث֨ О数模Ѿәҿ，ֲ柱棱ङ）تਸ਼ 边长 SS（ 有配֮Սӈङў样З每。） ֣（）تਸ਼ IS（
ू९ИङӈՍ套，就用й՟य़ॐ҆ИङӁ型收ঢ়模型ӣ 整完ङў样ѳછ术技ङ性ְॄ非չ性ְॄ用采。果ৈ析 性ՃҿИङ收ঢ়量。 工Џ化ડ生ф
要完成验ચ必须进੧ब应ङ工Џ化ડ生ф，据此Օ观 ङф生ડ，ЈӑەѾѠ֨。率սӟչ性整完ङў铸ӱب 时险风י意现ӟ֨Ќ，性整完ङў铸ચґ是都求要步初 ЉՇ生熔化。 ֜，化ѩङ率սӟث是ॅׂङ文本数Հਫ工ङ९ू
֨。ѳછչ定鉴д੧进数Հਫ工ङ式模ঢ়收ր影ث，此 此，我ћ挑选дҿИ最重要ङ一пՀ数并就收ঢ়进੧д છѳ。最重要ङ工ਫՀ数是： 率速֡凝 ș ș ґ温 Շ热ӈՍ套չ੭ঢ়系统ગઋ
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FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION March 2016
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