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随着铸造工业的发展,我国用机械造型代替手工造型越来越多,建立的各种类型造型线也越来越多。但是这些造型线开动率一般都比较低,如我国工业比较发达的某地区,拥有48条造型线,1983年统计开动率仅50%,和国外差距很大(国外为84~90%)。因此,人们注意力都集中到如何提高开动率这一点上,而忽视减少型废率这个问题。事实上,减少型废率是提高造型线生产能力的一个重要途径。从上式可知,减少废型数,提高有效型数就等于提高造型线的生产能力。对于大量流水生产,这一点尤为突出。
With the development of foundry industry, China uses more and more mechanical modeling instead of manual modeling, and more and more various modeling lines have been established. However, these molding lines generally have relatively low operating rates. For example, in some areas where China’s industry is relatively developed, 48 molding lines have been established. In 1983, the statistics started only 50% and the gap with other countries was quite large (84-90% abroad). As a result, attention has focused on how to increase the turn-on rate, while neglecting the issue of reducing scrap rates. In fact, reducing waste rate is an important way to improve the production capacity of molding line. It can be seen from the above formula, reduce the number of waste, increase the effective number is equal to improve the production capacity of the molding line. This is especially true for a large number of production lines.