| 摘要 |
<p>The invention refers to aluminium alloys with good machinability, particularly materials for automates based on ALCu or AlMgSi. As an addition they contain 0.2 to 1.2 mass% of tin and 0.2 to 1.0 mass% of bismuth for breaking the chips. The alloy based on AlCU contains the following amounts of metals expressed in mass%: copper 4.6-6.0 %, bismuth 0.2 - 1.0%, tin 0.2 to 0.7%, zinc up to 0.45%, iron maximum 0.7%, silicon maximum 0.4%, as well as further alloyed elements, max. 0.05% each, total share 0.15%, the remaining share is aluminium. The alloy based on AlMgSi contains the following substances in mass %: magnesium 0.6 to 1.2, silicon 0.6 to 1.4%, bismuth 0.2 to 0.7%. manganese 0.2 to 0.6%, iron maximum 0.5%, copper maximum 0.5% (preferably 0.15 to 0.4), titanium max. 0.2% (preferably 0.04 to 0.1), as well as other alloyed elements, each maximum 0.05, totally max. 0.15%, the rest is aluminium. By combined use of tin and bismuth, the use of lead, which is harmful to health, can be avoided.</p> |
