product news/產品新聞
Torpedo Body Cast with Vertical Pouring Process 用垂直浇注生产鱼雷式车身铸件
When the U.S. Navy needed to produce recoverable
exercise torpedoes, known as REXTORPS, it initially explored manufacturing the 4-ft. forebody section as an aluminum casting. Te X-ray inspection requirement and the varying wall thickness required by the design initially led to significant complications. Te ends of the cylindri- cal torpedo body are about 2 in. thick and the walls go from a thickness of 0.25 in. near the edges to about 2 in. near the center portion. After two metalcasting facilities failed to produce
quality castings after two years of effort, the U.S. Navy began exploring other options, including boring the sec- tion out of solid stock. But David Howell, owner of AlumAlloy Co., Ontario,
Calif., was pretty sure he could meet the requirements of the casting. In fact, in 2006, he was so confident that he offered the part buyer a deal that was difficult to refuse. “If we do not give you a first article by the due date
according to your satisfaction and all the X-ray require- ments, you don’t owe us a dime,” Howell said. Te first two metalcasters had attempted to produce the torpedo bodies by positioning the sand mold on the
美国海军制造可重复训练的鱼雷REXTORPS时，最 初研究用铝铸件制造1.2米的前段部分。最初的设计需 要X光的检测以及壁厚尺寸变化，这样结构非常复杂。 圆柱形鱼雷机体的末端壁厚约50.8毫米，同时整个产 品的壁厚从边缘附近的6.35毫米变化到接近中间部位 的50.8毫米。
在两个铸件厂经过两年努力仍未生产出高质量铸件之 后，美国海军开始找寻其他的方法，包括直接钻孔加工 固定坯料。
但是加利福尼亚州安大略AlumAlloy的老板David
Howell非常确信他能够满足铸件的需求。实际上，在 2006年，他曾非常自信地交付给了客户一笔很诱人的 订单。
“如果未能在交货期内依照你的采购要求交货并达到 X光检测需求，我们分文不收，”他说。 最初两家铸造厂试图通过在地面放置砂型进而能够水 平浇注的方式来生产鱼雷机体。铸件的下半部分可以通 过X光检测，但是上半部分不能。Howell的解决方案是
The 210-lb. practice torpedoes, cast in aluminum alloy A356-T6, represent a significant savings compared to machining the cylinders from solid billet.
采用A356合金、T6热处理工艺加工95.3千克 的练习用鱼雷机体铸件，与固体坯料直接加工 圆柱体的工艺比较，成本大大节约。
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FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION June 2014
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