粗镗连杆大头孔专用镗床总体及夹具设计摘要
粗镗连杆大头孔专用镗床总体及夹具设计
摘要：为了满足连杆大批量生产的需要，本课题设计了一台粗镗连杆大头孔专用镗床，设计的主要内容包括机床总体设计和夹具设计两个部分。机床总体设计主要包括机床配置型式的确定、结构方案的选择以及“三图一卡”的绘制。本机床采用卧式双面布置，整体底座，由两个非标机械滑台驱动专用镗削头进行镗削加工。一次装夹可实现单面两个相同品种连杆的加工，双面四个相同品种连杆的加工。夹具设计部分，选择并确定了工件的定位与夹紧方案。采用连杆端面作为主要定位基准，连杆小端外表面和大头孔上的一个工艺搭子面作为辅助定位基准。采用定位块、支承钉、支承块作为定位元件，使工件准确定位。夹具采用液压夹紧的方案。为了减少切削振动，夹紧位置靠近加工部位；为了减少夹紧变形，夹紧力主要分布在工件刚性较好的部位。此外，为了实行工件的准确定位，在连杆大端侧面还增加了一个辅助夹紧。该夹具定位、夹紧可靠，操作方便，可满足连杆大批量生产的需要。
关键词：镗床；夹具；定位；夹紧；连杆
Design of General and boring jig of Special Boring Machine for Heavy Boring of Big End Hole of the Connecting Rod Abstract: To meet the demand of mass production of connecting rod, a special boring machine is designed for heavy boring of big end hole. The topic is to design general and boring jig of the machine tool. The general design includes the arranging of the machine tool, the choosing of the structure plan and the completing of “three drawings and one card ” (the working procedure drawing of the part machined, the general drawing of the machine tool, the drawing of cutter display and the calculation card of productivity). This machine tool is horizontal, entire pedestal is adopted, and
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