19:46 Jan 15, 2017 |
English to Czech translations [PRO] Tech/Engineering - Metallurgy / Casting | |||||||
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| Selected response from: Ales Horak Czech Republic Local time: 04:08 | ||||||
Grading comment
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Summary of answers provided | ||||
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3 +1 | (tavné) kolíky |
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(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. |
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