从意大利进口的M30B中空吹塑机运转三个月后,挤出机传动系统中斜齿轮轴折断及齿轮弯曲折断。经时该轴进行化学成分、金相组织和断口扫描电镜分析,认为是由于设计、加工及热处理原因造成轮齿齿部先断。脱落的轮牙嵌入齿间导致轮轴受到极大弯距,从而发生轮轴快速脆性断裂。 Three months after the M30B blow molding machine imported from Italy, the helical gear shaft in the extruder drive system broke and the gear was bent and broken. After the shaft of the chemical composition, microstructure and fracture analysis by scanning electron microscopy, that is due to the design, processing and heat treatment causes gear tooth first break. Exfoliated gear teeth embedded in the interdependency of the wheel axle is subject to great bending, resulting in rapid brittle fracture of the axle.