PRODUCT NEWS/產品新聞
in the ladle can cause a short shot that leads to insufficient biscuit length. Since the robot removes the casting from the die by gripping the biscuit, inconsistent biscuit length can prevent proper robotic removal. Tis situation resulted in machine down time and the need for operator intervention at General Aluminum. Metal build-up in the ladle also was a prime cause of non-fill defects that resulted in scrap parts at the diecasting facility. Without skull build-up in the RFM ladles, the pour-
ing volume remains the same, allowing a consistent biscuit length. Since the ladles’ introduction, General Aluminum has experienced greater efficiency in robotic removal of the castings. RFM ladles are constructed from a low-density
refractory composite material using a lamination process that results in tough products that are tolerant of mild mechanical abuse. The construction process allows the walls and base of the RFM ladle to be manufactured with much thinner sections than usually associated with cast refractory ladles, adapting better to the tight space constraints of the dip well and pouring envelope typical in high-pressure diecasting. The shape of RFM ladles also contributes to their
efficiency. When ladle shape is inconsistent, reprogram- ming of the ladle fill and pour parameters is required to maintain proper die fill. During manufacturing, RFM ladles are fabricated over a mold, and mounting hardware is placed and properly aligned with the aid of a fixture to ensure consistent location from ladle to ladle. The result- ing consistent shape makes reprogramming unnecessary. Te RFM material is more durable and offers superior insu-
lating properties in comparison to many materials often used in this application. Its material density of 1600 kg/cu.m affords a good strength to density ratio. Pyrotek’s RFM auto-pour ladles come with a factory applied finish of non-wetting ZYP Boron
Nitride Lubricoat Blue to enhance ladle performance. ■ For more information, visit
www.pyrotek.info.
润的特点可以防止金属结壳粘结。金属在浇包中结壳粘 结会引起压射缩短，进而导致料柄的长度不足。由于机 器人通过夹住料柄的方式将铸件从压铸模中取出，如果 料柄的长度不够将影响机械人的操作。这还会引起停机 和需要操作工人干预。金属在浇包中结壳粘结也是浇不 足缺陷的主要原因，浇不足导致废品。
在采用增强玻璃纤维技术的浇包中就没有结壳粘结现 象，浇注量保持稳定，料柄的长度稳定。采用了该浇包 后，General Aluminum公司机械人取铸件的效率大幅 提升。
该浇包由低密度的耐火复合材料制成，采用了一种分 层工序，该工序提高了材料的强度，还能够抵抗轻微的 机械冲击。该制造工艺使浇包壁和底部的断面比铸造耐 火材料浇包更薄，从而更加适合压铸中的浇口窝和浇注 通道之间空间狭小的特点。
该浇包的形状也使效率提高。如果各浇包的形状不一 致，需要重新编程填满浇包和浇注参数，从而保证正确 的浇注。在制造该浇包时，采用了模子，并且放置了安 装部件，该部件在卡具的作用下对得很直，从而保证了 制造过程中各浇包的位置。新式浇包的形状都一致，这 就免去了浇注过程中的重新编程。
增强玻璃纤维技术中用到的材料更加耐用，并且 和很多材料相比其保温性能更优越。该材料的密度为 1600kg/m3，有很好的比强度。Pyrotek公司采用增强 玻璃纤维技术的浇包和某工厂合作，采用了该工厂的非 浸润的ZYP氮化硼润滑材料来增强浇包的使用性能。 ■ 欲了解更多信息，请访问
www.pyrotek.info。
Shown is a 12-lb. rein- forced fiberglass material ladle with a non-wetting boron nitride coating.
增强玻璃纤维材料浇 包（左）通常寿命为6 个月，而一般的耐火 纤维浇包寿命为2~6个 星期。
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FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION Summer 2011
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