Green Strength
Romanian translation: rezistența/tăria (piesei)în stare crudă/verde
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| 17:04 Nov 20, 2015 |
| English to Romanian translations [PRO] Tech/Engineering - Metallurgy / Casting | |||||||
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|  Selected response from: ION CAPATINA United States | ||||||
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| 4 +2 | rezistența/tăria (piesei)în stare crudă/verde |
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Answers
1 hr confidence: 
peer agreement (net): +2
peer agreement (net): +2| green strength rezistența/tăria (piesei)în stare crudă/verde Explanation: Este vorba de rezistența piesei după presare, dar înainte de sinterizare, se consideră că piesa este "crudă, verde". Tehnologia pulberilor lucrează la îmbunătățirea proprietăților pieselor nesinterizate pentru a nu avea rebuturi în timpul manipulării în procesul tehnologic. http://www.ipmd.net/Introduction_to_powder_metallurgy/Sinter... “After compaction, neighbouring powder particles are held together by cold welds, which give the compact sufficient “green strength” to be handled. At sintering temperature, diffusion processes cause necks to form and grow at these contact points. - See more at: http://www.ipmd.net/Introduction_to_powder_metallurgy/Sinter...” http://www.gkn.com/hoeganaes/media/Tech Library/173. Higher ... “Green strength plays an important role in powder metallurgy (P/M) processing for several reasons. Vulnerability of fragile green compacts that can be damaged during handling, particularly automated handling, is of great concern to parts manufacturers. Enhanced green strength helps to reduce green scrap and allows more automation in the processing line. High green strength may also permit green machining, that is an attractive alternative to machining sintered parts. The primary source of green strength for powder compacts is particle interlocking [1]. Iron powders that differ in particle shape, size, surface area and the level of alloying elements will develop varying levels of green strength [2]. For example atomized iron, because of its less irregular shape when compared to sponge iron, provides lower green lower green strength.” http://thelibraryofmanufacturing.com/pressing_sintering.html “Powder pressing is the compaction of powders into a geometric form. Pressing is usually performed at room temperature. This creates a solid part called a “GREEN COMPACT”. The strength of this pressed, unsintered part, (green strength) is dependent on compactability, binders may be used to increase compactability. Typically a green compact can be broken apart by hand but is also strong enough to be handled, gently. The geometry of the green compact is similar to that of the final part, however, shrinkage will occur during the sintering phase of the manufacturing process and must be calculated in.” http://www.fih.upt.ro/v3/licenta/2013/rezolvari_subiecte_lic... “FORMAREA PRIN PRESARE DIRECTĂ UMEDĂ (crudă ori verde) se caracterizează prin faptul că amestecul ceramic de formare conţine 8 – 12% apă. Dacă însă amestecul respectiv conţine mai puţin de 8% apă (umiditate), presarea este directă – USCATĂ. Prin formarea directă – umedă sau uscată – pot fi realizate produse cu configuraţii complicate şi precise dimensional şi cu forme geometrice variate.” |
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