product news/產品新聞 Basketless通过热处理实现了节能，提升了产品的力学性能
Basketless Heat Treating Saves Energy, Improves Casting Properties Te heat treating process is necessary to improve alumi-
num mechanical properties, stabilize the material for service, and reduce or eliminate residual stresses. Conventional heat treatment systems, which typically utilize roller hearth furnaces, are long, linear operations that use significant floor space to process baskets of parts. Many systems are more than 61 m long, and processing can take between two and 14 hours. Te challenges of the conventional system stem from its
size and the baskets used to transfer each batch of parts from solution to quench to artificial aging. Te large floor space taken up by long, linear systems can
be a burden on exhaust systems and sand handling, as well as gas and electricity costs. Baskets often are densely loaded to fit as many parts in as possible, which sometimes results in centrally located parts receiving a different thermal profile than parts on the outside edges of the basket. Te baskets themselves suffer from thermal fatigue and deformation, which can cause jams in the system, misquenches, and added lifetime costs due to ongoing replacement and repair. Can Eng Furnaces International, Niagara Falls, N.Y.,
U.S.A., has designed a heat treat system that addresses these challenges. Can Eng studied the available furnace configura- tions, including walking beam, chain conveyor and fluidized beds, before finally settling on a rotary hearth design that was used in early forging operations. Rotary hearth furnaces are cylindrical and feature a
rotating carousel and common loading and unloading doors. Can Eng modernized the design to address the concerns stemming from linear heat treating systems, such as large footprint and the need to continuously replace baskets. To increase the capacity of the rotary hearth system, the
manufacturer integrated multiple hearth levels to increase the production rate. By adding levels, the system grew in height, rather than footprint. Te footprint often is 33%
热处理可以提高铝合金的力学性能、延长材料的服役 寿命并降低乃至消除残余应力。传统的热处理系统通常 采用辊底炉进行加热，这种炉采用直线的布局方式，因 此会占用大量的空间。很多系统都超过了61米（200英 尺）长，其热处理时间在2-14小时之间。 传统热处理系统面临的一是占地问题，二是盛放工件 的料筐问题，这些料筐从固溶到淬火一直到最后的人工 时效阶段都会使用。
直线型布局所站的用地对于整个热处理系统是一个很 大的负担和浪费，同时也浪费了大量的天然气和电力。 热处理料筐一般都会尽可能多地放入铸件，有时就会导 致料筐不同部位的铸件受热不均。料筐也会发生热疲劳 和变形，这就会使系统发生料筐卡住、误淬火等，并增 加了由于替换料筐和维修而增加的费用。 Can Eng熔炉国际公司（尼亚加拉瀑布，纽约，美 国）设计了一套热处理系统来应对这些挑战。Can Eng 公司研究了有效的熔炉结构配置，其中包括步进梁、链 条输送机和流化床，随后采用了先前用于锻造过程中的 旋转炉设计。
转底炉呈圆形，包括旋转基座和公共的装卸料门组 成。Can Eng重新进行了设计，用来解决热处理炉直线 型布局的问题，例如占用空间大和需要频繁更换料筐问 题。
为了增加旋转炉系统的产能，生产商设计了多个炉层 来增加生产率（磅/每小时）。随着层数的增加，系统
Basketless heat treating is based on the rotary hearth furnace design once used in forging.
无料筐热处理系统是基于 在锻造中使用过的转底炉 的设计。
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FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION Winter 2012
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