为什么锯叶片破裂？
Dora Zhang
2022-06-21 12:05:31
实际上，钻石锯叶片的裂纹也可能引起类似的裂缝。
导致钻石锯叶片裂纹的分析
在某些情况下，胶结碳化物切割工具上的裂缝是由过度焊接应力引起的，这超出了胶结碳化物切割工具的强度。当焊接切割器时，切割机体的高度HC应大于刀片高度HT。例如，HC在焊接后很容易引起合金叶片的裂缝。如果HC<3, the surface layer of cemented carbide will produce tensile stress and crack easily; When hc=4 ~ 5, there is no significant stress on the cemented carbide surface, so it is not easy to produce cracks, even if there are cracks, it is not obvious; When hc<8, uniform load will be generated on the welding layer. However, the bending of the alloy blade produces tensile stress along the thickness direction of the alloy blade, and the force distribution in the welding layer is more complex than that of the alloy itself, because it is not bonded on one face, but on two, three or four faces.
原因是，当水泥碳化物迅速加热并冷却时，由于热分布不平衡，可能会产生明显的瞬态应力。在快速加热期间，碳化物的外层处于压缩应力下，中间处于拉伸应力下。当超过允许的加热速率时，可能会出现裂缝或内部看不见的裂纹。当焊接碳化物碳化物工具时，快速冷却也非常危险。在这种情况下，拉伸应力将出现在外层上，从而导致合金裂纹。
导致钻石锯叶片裂纹的分析
在某些情况下，胶结碳化物切割工具上的裂缝是由过度焊接应力引起的，这超出了胶结碳化物切割工具的强度。当焊接切割器时，切割机体的高度HC应大于刀片高度HT。例如，HC在焊接后很容易引起合金叶片的裂缝。如果HC<3, the surface layer of cemented carbide will produce tensile stress and crack easily; When hc=4 ~ 5, there is no significant stress on the cemented carbide surface, so it is not easy to produce cracks, even if there are cracks, it is not obvious; When hc<8, uniform load will be generated on the welding layer. However, the bending of the alloy blade produces tensile stress along the thickness direction of the alloy blade, and the force distribution in the welding layer is more complex than that of the alloy itself, because it is not bonded on one face, but on two, three or four faces.
原因是，当水泥碳化物迅速加热并冷却时，由于热分布不平衡，可能会产生明显的瞬态应力。在快速加热期间，碳化物的外层处于压缩应力下，中间处于拉伸应力下。当超过允许的加热速率时，可能会出现裂缝或内部看不见的裂纹。当焊接碳化物碳化物工具时，快速冷却也非常危险。在这种情况下，拉伸应力将出现在外层上，从而导致合金裂纹。
