16 17
produce your sand casting. Machined sand might need draft. Te tooling will limit
19
fillet sizes. You must be able to see what needs machined. Normally this method is not suitable for a core. On the plus side, there is no need for tooling, it’s fast, any sand with or without additive can be used, and large molds normally are cheaper than printed sand. In conventional tooling, draft is needed. Te more com-
plexity or tooling needed, the longer the lead times will be, but any sand—with or without an additive—can be used and it may be the most economical route depending on complexity, quantity and size. 3-D printed sand carries the need to be able to remove unbound sand, and consumables are limited. But no draft is needed, you are able to combine multiple cores into a single core and print complex geometry, and lead times are short.—Rittmeyer ■
Te tips shared in this article were taken from presentations given at the AFS Additive Manufacturing for Metal Casting Conference held October 3-6, 2016, in Novi, Michigan.
It’s time to unlearn standard flask sizes, common height copes and drags. Don’t be a square. 3-D printed molds can be contoured around the shape of the casting, saving printing time and mold material.—Brandon Lamoncha, Humtown Products
But still use common sense. You must have a parting line to clean internal cavities. Te entire mold or mold pieces must fit in the printer. Safe handling practices must be consid- ered.—Lamoncha
—Dave Rittmeyer, Hoosier Pattern. Closing Note
18
So which process is best? All of them: conventional tooling, printed sand, or machined sand. In order to optimize printed mold designs, you need to learn how to apply each option or combination of options for the most cost effective and/or fastest way to
Printed sand’s strongest advantage is reduced lead time. Tere is no need to manufacture tooling, part development can be at infancy stage, package designs (partings) are unconstrained, and there is more freedom in gating strategy.
16 17 18
型。 尺અ֤Ӳ限رӀ模。چ斜模拔要需ਈՕ型砂工加械机
19
Љਢ一法方य़这。ѹ部ङ工加要需楚清须必҂，此֜。ت 速ф生此֜，Ӏ模Շ开要必有没，面方一Ր。ਯ砂й用适 ৲，）剂加添有խի是ખ无（子砂ѾѠ用҅љՕ还ͺ快چ 。宜便型砂印۸比常通型砂型םङ工加械机，Ќ 越构ৈ。ङ要必是چ斜模拔，Ӏ模工加ਫ工统Ѯ用҅
（子砂ѾѠѸ，长越间时ૄс，ך越Ӏ模ङ要需或杂ז չ量数，性杂זђ，用҅љՕ都）剂加添有խի是ખ无 。ਫ工ф生ङ济经最是ਈՕ这，ਖ਼ৰ面方شם ङ子砂ङ合ৈ未除Ծלਈдӟ提ਫ工型砂印۸*
需要，৲Ќ，৴材ङ҅用有限。Ѹ是Љ需要拔模，҂Օ 形Ѿәङ杂זӟ印۸并，ਯ砂З一О合ৈਯ砂Зךرљ ■ ض迈特瑞 状，сૄ时间很ि。
ѫ协造铸国২ਘӟ巧技ङઋગ造Ӳ材增йҼङцӣ۱文本 ઑѫ造Ӳ材增ङ办Р维મ州根歇إ֨日 й 年 月 ङ报ճ。
44 |
FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION March 2017
、ت尺ঔ砂ӕ标йث往љ开抛બ 砂。જઍङچ高ঔЈЇङ用通 印۸* ঔЉ必是方方正正ङ。 砂型Օ根据铸ў形状ҟӟ波状 材型铸չ间时印۸约ਭ，廓轮 料。ȍRGSUTING
常જё然有用。型腔ӄ部必须有 用љ清洁ङӣ型ি。整З铸型或 印۸й合适须必ӣ部成ুङ型铸 机。બґચ安Ҷ操ҁ。 ȍRGSUTING
сصӗ是势ѩङם最型砂印۸ Ӳ需无有Ӏ还，י此。间时ૄ 起֨љՕՇ开ङў铸、Ӏ模造 ）ك型ӣ（ઋગ装包、段阶步 ЉՉ限ӲљՃ浇注系统ગઋ更 ਘंঈѩ点。ȍ*G\K 8OZ
ZSK_KX .UUYOKX 6GZZKXT গ论
۸型砂、ਫ工Ӏ模ङ统Ѯ，Ї综 印Ճ机械加工砂型，քय़工ਫ是 ङ型砂印۸化ѩдО;呢ङױ最 य़一每用应ѾײЮ学要需，ઋગ 工ਫ或ু合工ਫ，ђ৲实现最Ӏ 成本效ञչ最快ङ方式来生ф砂
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63