变速叉工艺规程制定与夹具设计.docVIP

变速叉工艺规程制定与夹具设计 摘 要 现在，变速箱运用的十分的广泛，变速叉又是其中的一个重要的组成部分。本文主要任务是制定变速叉的工艺规程和对其加工所需的专用夹具的设计。首先，先对零件进行工艺分析，明确加工表面及加工要求（包括粗糙度、尺寸和位置精度）；然后制定变速叉的加工工艺规程，确定毛坯的材料和制造形式，接着选择加工时工件的定位基准，包括粗基准的选择和精基准的选择；再拟定加工的工艺路线，安排加工工序，既要求合理，又要确保工件的位置精度能够得到保证；随后确定工件的加工余量、工序尺寸、公差和毛坯的尺寸，以及确定切削用量和基本工时；最后，对要加工的工序进行专用夹具的设计，确定工件的装夹定位，又要使工件方便装夹，减少加工的辅助时间。 关键字：变速叉、加工工艺、专用夹具 The Establishment of the Technical Schedule of the Gear Shift Fork and the Fixture Design Abstract At present, the use of the gearbox is very widely, and the gear shift fork is also the important part of it. The main task of the paper is to establish the technical schedule of the gear shift fork and the design of the special fixture which is needed in the process. Above all, the first steps are to analysis the technology, and define the surface and the requirement of the process including the roughness, size and the accuracy of position; next are to make the manufacturing technical schedule of the process of the gear shift fork, and confirm the material and the manufacturing form of the rough; then, the datum reference of the work piece which is used in the process should be selected including the selection of the coarse datum and the accurate datum; next are to study out the manufacturing routing, and arrange the manufacturing processes which should be required recently and make sure of the accuracy of position of the work piece; next is to confirm the machining allowance of the work piece, procedure and size, tolerance and the size of the rough, as well as the cutting parameters and the time; the last steps are to design the special fixture for the manufacturing processes, make sure of the clamping and locating. The work piece should be lamped conveniently to reduce the manufacturing auxiliary time. Key words: gear shift fork; manufacturing technology; special fixture 目录 第一章 绪论 1 1．1 引言 1 1．2 研究内容 1 1．3 工作原理及磨损 1 1．4 机械加工工艺规程的作用 2 1．5 机械加工工艺规程的设计原则 2 1．6 机床夹具的工作原理及作用 2 1．6．1 机床夹具的工作原理 2 1．6．2 机床夹具的作用 3 第二章 工艺规程制定 4 2．1 毛坯的制造 4 2．2