编辑先生:贵刊二卷七期由荣科先生著的「铸铝合金熔化技术之管制」一文,我看了以后给予很多的帮助。因为我厂是制造各种轮胎凡尔的,尤其像卡车内胎用凡尔,在砂模翻成后再加以加工;由於技术上的不夠,铜和其他元素配合不符,在弯曲后每多缩裂。看了本文后,虽然在其他工作上有了很多改 Mr. Edit: The article “Control of the melting of cast aluminum alloys” written by Mr. Rong Ke in the second volume of the 7th issue of your magazine has helped me a lot. Because our factory is manufacturing all kinds of tires Verr, especially like the inner tube of trucks used Verel, after the sand mold turned into processing; due to technically inadequate, copper and other elements do not match, every crack after bending . After reading this article, although there have been many changes in other work