论文部分内容阅读
可靠的计算机模型对周期式和连续式炉的渗碳,可缩短作业时间,且工艺设计会比目前做到的要详细得多。这些模型的关键因素是炉气,计算的主要目的是描述进入炉子的气流率和渗碳气中分解出的碳,怎样影响炉气成份。假定“碳耗”(克。℃/秒)与工件的总表面积成正比关系,而炉气和工件表面的碳势不同。表面含碳量也是碳在工件内扩散速率的一个函数。假定炉气本身总是热力学平衡,那么吸热式气体和天然气进入炉子的速率及其碳分解率,在气体成份变化时是纯净值。推进式炉的计算机程序分成两部分。第一部分内容包括料盘的数量,每区的温度。
Robust computer models for carburizing both periodic and continuous furnaces reduce operating time and process design is much more detailed than currently possible. The key factor in these models is the furnace gas. The main purpose of the calculation is to describe how the gas flow into the furnace and the carbon decomposed in the carburizing gas affect the composition of the furnace gas. It is assumed that “carbon loss” (grams.C / second) is proportional to the total surface area of the workpiece, while the carbon potential on the surface of the furnace gas and the workpiece is different. The surface carbon content is also a function of carbon diffusion rate within the workpiece. Assuming that the furnace gas itself is always thermodynamically balanced, the rate of endothermic gas and natural gas entry into the furnace and its carbon decomposition rate are pure values as the gas composition changes. The pusher furnace computer program is divided into two parts. The first part includes the number of trays, the temperature of each zone.