论文部分内容阅读
一、气缸套产生裂纹的原因据 B&W 公司的研究报告指出,随着柴油机向高压、高温方向发展,近几年缸套产生裂纹的现象也在不断增加。该公司认为,在大多数情况下,裂纹的产生,基本上是由于过热所致,或者由于材料和生产上的差错,也常常由于活塞环漏气和材料的“蠕变”现象所造成。蠕变,有时叫做松弛,它是研究在极微小的应力下不产生的很慢的永久变形的现象。现代柴油机的气缸套需承受较高的热负荷,其变形可能发生得相对快一些。当外加的大量热量
First, the cause of the cylinder liner cracks According to B & W’s research report pointed out that with the diesel engine to high pressure, high temperature direction, in recent years, the phenomenon of cylinder liner cracks are also increasing. The company believes that in most cases, the crack is generated mainly due to overheating, or due to material and manufacturing errors, often due to piston ring leakage and material “creep” phenomenon. Creep, sometimes called relaxation, is a study of very slow permanent deformations that do not occur with very little stress. Modern diesel engine cylinder liner to withstand higher heat load, the deformation may occur relatively faster. When applied a lot of heat