Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.NO3机件常用的表达方法•§3-1视图•§3-2剖视图•§3-3断面图•§3-4局部放大图&简化表达方法Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.一、局部放大图二、简化画法•§3-4局部放大图&简化表达方法Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.将零件的部分结构，用大于原图形所采用的比例放大画出的图形称为局部放大图。一、局部放大图Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.（1）局部放大图可画成视图、剖视图或断面图。它与被放大部分的表示法无关。1、画局部放大图（2）局部放大图采用剖视图和断面图时，其图形按比例放大，断面区域中的剖面线的间距必须仍与原图保持一致。Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.2.局部放大图必须标注：ⅡⅠ4:1Ⅰ2:1Ⅱ将需要放大的部位画上细实线圆，然后在局部放大图的上方注写绘图比例。当零件上被放大的部分仅一个时，在局部放大图的上方只需注明所采用的比例。Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.肋板的画法;均匀分布的肋板及孔的画法;机件上小平面的画法;对称图形的画法;断开的画法andsoon.二、简化画法Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.对于机件的肋板，如按纵向剖切，肋板不画剖面符号，而用粗实线将它与其邻接部分分开。规则：正确错误AAA—ACopyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.9.断开的画法轴、杆类较长的机件，当沿长度方向形状相同或按一定规律变化时，允许断开画出。标注尺寸时，仍注实长拉杆轴套断开画法阶梯轴断开画法实长实长Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.10.对称图形的画法在不致引起误解时，可只画一半或四分之一，并在对称中心线的两端画出两条与其垂直的平行细实线。Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.(1)小圆角、小倒角的表示R2锐边倒圆R0.51×45零件图上的小圆角、小倒角允许省略不画，但必须标注尺寸或在技术要求中加以说明10.其他简化画法只介绍了常用的几种，这部分内容较多，需要时可查阅有关标准。Copyright2009-2014HefeiUniversityofTechnology&BENGBUCOLLEGEJDXZHANGXIANGCHUNAllrightsreserved.(2)断面图上的剖面符号AAA-A零件图中的移出断面，允许省略剖面符号，但必须标注剖切位置、字母
