The fertilizer knife, shown in blue, is attached to the Coulter disc to keep the blade free of residue and protect the fertilizer tubes from wear.
肥料刀，如蓝色所示，布置在 犁刀盘上，使刀片远离残渣， 保护肥料管道不被磨损。
second core was used to pro- duce the cavity for the fertilizer delivery tube and incorporate a mounting hole for the beaver- tail, which had been a separate part welded onto the knife. A square carriage bolt hole for the tube assembly was incorpo- rated into the mold to eliminate machining requirements. At Lethbridge’s suggestion, the knife features a carbide insert on the leading edge for superior wear over an as-cast edge. Leth- bridge grinds the parting lines robotically with a diamond- coated wheel for superior dimensional control. With the final cast design, Yetter achieved a 60% cost savings and reduced its part numbers to two for right and left hand versions of the one-piece casting. One casting may be used for several end-products, such as a single tube, double tube or vapor tube. Te cast knife provides greater protection of the delivery tubes from the soil, leading to significantly longer wear life. Yetter’s order accuracy also increased due to the decrease in part numbers and ability of the same knife to be used with various tube kits. “We needed to clean the part up [by casting it],” Lucas said.
“We cleaned it up in every aspect, including inventory. We were able to cut down on the number of parts, which helps maintain our tolerance.”
Online resource: To see an in- teractive 3-D view of the CADI fertilizer knife, go to www.
globalcastingmagazine.com.
配提供尺寸稳定性。第二个 型芯用来产生肥料输送管道 的内腔，包含一个测高天线 的安装孔，测高天线作为一 个单独的零件焊接在刀具 上。一个用于管装配的方形
的车身螺栓孔，并入铸型中，消除了机加工的必要。在 莱斯布里奇的建议下，刀具前缘作增碳处理，使其拥有 比未加工铸件更高的耐磨性。莱斯布里奇用覆有金刚石 的打磨轮磨光分型面，实现更高的尺寸控制。 利用最终设计的铸件，Yetter节省了60%的费用，把 零件数目减少至两个，分为左右两种部分。一个铸件可 以用于几个终产品，比如单管，双管或蒸汽管。铸造刀 具提供了良好的保护，避免输送管道接触土壤，使得疲 劳寿命大大增强。由于零件数目减少，相同刀具被用于 不同管元件，Yetter的订单准确性也提高了。 “我们需要清理零件（通过铸造）”，Lucas说。“ 我们对它在每一个方面都进行了清理，包括库存。我们 能够缩减零件的数目，保 证尺寸公差。
在线资源：看CADI肥料刀的 交互式3d图像，去
www.globalcasting
magazine.com.
Lethbridge Iron Works used shell cores for the mounting ears and holes at the top of the casting. A second core was used to pro- duce the cavity for the fertilizer delivery tube.
莱斯布里奇铸铁厂使用壳芯制 造铸件顶部的吊耳和孔洞。另 一个型芯用于制造肥料输送管 的内腔。
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FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION May 2013
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