形状比較复杂的泥芯,做芯骨也比较麻烦的。我們在做柴油机的缸头芯骨时,用铅絲做芯骨时效率很低。后来改进了一种簡单工具,在一块木板上用鉛笔划出泥芯骨的形状,然后在划綫的两旁釘上一些洋釘如附图。这样就可以很方便的将鉛丝在两排钉子中間弯成泥芯骨 More complex shape of the mud core, ciliary bone is also more troublesome. When we are doing the cylinder head of a diesel engine, the efficiency of using lead wire to make cored bar is very low. Later, a simple tool was improved, using a pencil on a wooden plank out of the shape of the crab bone, and then nailed some nail on both sides of the marking as shown in the attached drawings. This can be very convenient to lead wire in the middle of two rows of nails curved into cored bone