简介:0引言曲轴-这是内燃机的主要零件之一,它关系到内燃机的工作能力和可靠性.曲轴的主要质量参数是制造精度(用尺寸误差以及表面的形状误差和位置误差决定)和轴颈工作表面的粗糙度.对曲轴的几何精度和表面质量的主要要求是:1)主轴颈和连杆轴颈的直径精度6~7级;圆度偏差4~5级精度;2)主轴颈相对曲轴轴线的跳动,对直径达100mm的轴颈不大于0.01~0.015mm,对较大直径的轴颈不大于0.015~0.025mm.连杆轴颈相对自身轴线的允许跳动量大约较主轴颈的跳动量大50%;3)曲轴半径的长度偏差不大于±0.15mm/100mm;曲拐之间的角度差在曲轴全长上不大于±30;4)飞轮紧固法兰的端面跳动不大于0.005mm/100mm;轴颈圆柱表面的粗糙度Ra≤0.63μm.
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简介:曲柄压力机属于机械传动类压力机,是重要的一类锻压设备。一般由工作机构、传动系统、操纵系统、能源系统、支承部件及其他辅助装置组成。曲柄滑块机构是曲柄压力机的工作执行机构。它的承载能力与运动规律很大程度上决定了曲柄压力机的工作特性。通常,其采用的运动分析的基本方法主要是图解法和解析法。由于图解法远不及解析法精度高,而且也不便于将机构的分析和综合问题联系起来.所以随着计算机应用水平的提高的求解方法是通过高级语言进行复杂的编程进行,费时多,一般技术人员不易掌握。本文给出一种不用编程即可快速实现其机构运动学仿真的既简便又实用的直观研究方法。