Rotary drum for magnetic tape scanner
专利汇可以提供Rotary drum for magnetic tape scanner专利检索，专利查询，专利分析的服务。并且PURPOSE: To improve surface condition and wear resistance by using a special forged Al-Si alloy for a rotary drum and forming specific machined lines on the surface of a passage for guiding a magnetic tape.
CONSTITUTION: A special forged Al-Si alloy is used for a rotary drum and parallel and roughly continuous machined lines having 1W6μm surface roughness are formed along the advancing direction of a magnetic tape to a passage for guiding said tape. The compsn. of said alloy consists of 8W15wt% Si, 0.5W 4wt% Cu, 0.05W1.0wt% Mg and the balance Al. The alloy is quickly cooled and solidified from a molten metal to crystallize finely an Si crystal. The cooling is accomplished at ≥(30W60°C/sec) cooling rate. The casting ingot is subjected to warm forging at 200°CW the m.p. or below and ≥30% reduction ratio and is again molded in the above-mentioned temp. range to part mechanically the Si crystal to ≤5μm average grain size and to disperse uniformly said crystal. Such molded alloy is subjected to a heat treatment and is finished to a drum by machining. The machined lines mentioned above are formed to said drum. The coefft. of slip friction is thus made ≤0.28 in the load range of a 10W100g tape.
COPYRIGHT: (C)1985,JPO&Japio，下面是Rotary drum for magnetic tape scanner专利的具体信息内容。
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