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  3. Metallurgy / Casting

pins

Czech translation: (tavné) kolíky

19:46 Jan 15, 2017
English to Czech translations [PRO]
Tech/Engineering - Metallurgy / Casting
English term or phrase: pins
Poznámka pod tabulkou tolerovaných rozměrů vad odlitku:
"Cracks, cold shut or cold splash, not melted or only partially melted 'pins' are not allowed."

Nějaký nápad o co se jedná? Díky.
Matej Bambusek
Czech Republic
Local time: 19:55
Czech translation:(tavné) kolíky
Explanation:
Podle tohoto textu se kolíky roztaví a stanou součástí odlitku, slouží pro proces odlévání

When intricately shaped castings are made, if the molten metal fills a mold from several different directions simultaneously, one advancing front may oxidize and form a skin that becomes entrapped when it meets another coming towards it. This “cold shut” can then represent a plane of weakness where the casting is not intimately fused.

When casting molds of complex shapes, it is sometimes necessary to promote rapid cooling to prevent hot tearing. This may be achieved by placing metallic thermal sinks or “chills” within the mold structure alongside the area to be cooled quickly. Occasionally, if the molten metal is particularly hot, these may become fused to the casting. To produce hollow castings, sacrificial “cores” are used that can be held in place by thin metallic pins of a composition similar to or matching that of the casting. The pins should melt and become fully incorporated into the casting, leaving the core in its intended position. If the pins do not melt however, they effectively form a through wall defect.
Selected response from:

Ales Horak
Czech Republic
Local time: 19:55
Grading comment
4 KudoZ points were awarded for this answer



Summary of answers provided
3 +1(tavné) kolíky
Ales Horak


  

Answers


20 mins   confidence: Answerer confidence 3/5Answerer confidence 3/5 peer agreement (net): +1
(tavné) kolíky


Explanation:
Podle tohoto textu se kolíky roztaví a stanou součástí odlitku, slouží pro proces odlévání

When intricately shaped castings are made, if the molten metal fills a mold from several different directions simultaneously, one advancing front may oxidize and form a skin that becomes entrapped when it meets another coming towards it. This “cold shut” can then represent a plane of weakness where the casting is not intimately fused.

When casting molds of complex shapes, it is sometimes necessary to promote rapid cooling to prevent hot tearing. This may be achieved by placing metallic thermal sinks or “chills” within the mold structure alongside the area to be cooled quickly. Occasionally, if the molten metal is particularly hot, these may become fused to the casting. To produce hollow castings, sacrificial “cores” are used that can be held in place by thin metallic pins of a composition similar to or matching that of the casting. The pins should melt and become fully incorporated into the casting, leaving the core in its intended position. If the pins do not melt however, they effectively form a through wall defect.

Ales Horak
Czech Republic
Local time: 19:55
Specializes in field
Native speaker of: Native in CzechCzech
PRO pts in category: 23

Peer comments on this answer (and responses from the answerer)
agree  Ivan Šimerka
46 mins
  -> děkuji :-)
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