This document specifies high speed gear units1) (hereinafter referred to as “gear units”) in terms of product designations, overall dimensions, technical requirements, inspection methods for assembly machines, accompanying files and dedicated tools, and requirements for marking, packaging, transportation and storage.
This document is applicable to gear units in petroleum, chemical, electric power, metallurgy and other industries, with external involute parallel shaft cylindrical hard flanks supported by sliding bearings, with tooth profiles conforming to GB/T 1356, pinion rotational speed not less than 3 000 r/min or pitch line velocity not less than 30 m/s. Technical specifications for other high speed gear units with similar structure can refer to this document.
This document is not applicable to gear units integrated with other rotating equipment such as prime movers or working machines.
定价: 972元 / 折扣价: 827 元 加购物车
本文件规定了用化学浸蚀的方法对磨削表面的局部过热进行检测及分级的操作和要求。
本文件描述的检测方法主要用于齿轮磨削表面,也可用于热处理后因机加工(如硬车削、铣削、去毛刺、倒角等)形成的异常表面。由于渗碳、脱碳导致的表面金相变化的检测可参照使用。
与大多数表面硬度检测方法相比,本文件描述的方法对于硬度变化更加敏感,以往的一些检测方法本文件不再推荐。
本文件适用于齿轮、轴、花键和轴承等淬火钢零件,不适用于氮化零件和不锈钢制零件。
注:本方法有时也被称为“硝酸腐蚀”,但不能与其他方法中的“硝酸腐蚀”等相混淆。
表面回火浸蚀工序用于表面磨削之后、最终精加工(如超精加工、喷丸和珩磨)之前。
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