43组合体三视图画法.ppt

Shape analysis method Shape analysis method 形体分析法形体分析法 Drawing methods and procedure Drawing methods and procedure 画图方法和步骤画图方法和步骤 Exercises Exercises 练****题练****题 Drawing Views posite Solids Drawing Views posite Solids 组合体三视图画法组合体三视图画法请点击相应标题显示其内容请点击相应标题显示其内容 2 1. 1. Divide posite solid Divide posite solid 分解组合体分解组合体 Shape analysis method Shape analysis method 形形体体分分析析法法 Shape analysis method Shape analysis method 形体分析法形体分析法 We first divide plex view into ponents based We first divide plex view into ponents based on loops of curves. We can then imagine their shapes and locations on loops of curves. We can then imagine their shapes and locations individually by using the projection principles. individually by using the projection principles. 所谓形体分析法就是假想把组合体分解为若干基本体,并确定它们的组所谓形体分析法就是假想把组合体分解为若干基本体,并确定它们的组合形式以及相邻表面间的相互位置的一种化繁为简的分析方法。合形式以及相邻表面间的相互位置的一种化繁为简的分析方法。 2. 2. Analyze structures of Analyze structures of solid solid 分析组分析组合合方式方式 3. 3. Analyze Analyze ubiety ubiety of of solid solid 分析位置关系分析位置关系(属叠加(属叠加、、切割、相切、相交? 切割、相切、相交? ) ) Steps 分析过程分析过程: 观察有几种单一的基本体观察有几种单一的基本体, ,并将其分解出来; 并将其分解出来; 搞清楚各部分是属于哪类组合? 搞清楚各部分是属于哪类组合? 搞清各部分上下、左右、前后的相对位置关系搞清各部分上下、左右、前后的相对位置关系? ? ( (对称否?平齐否? 对称否?平齐否? ) ) ( (有无棱柱、棱锥、圆柱、圆锥、圆球、圆环有无棱柱、棱锥、圆柱、圆锥、圆球、圆环? ?) ) 请点击鼠标左键显示后面内容请点击鼠标左键显示后面内容 3 Example2. Draw three views of posite solid. Example2. Draw three views of posite solid. 画切割组合体的三视图画切割组合体的三视图。。 1. 1. Shape analysis Shape analysis 进行形体分析进行形体分析 2. 2. Selection of the front view Selection of the front view 选择主视图方向选择主视图方向 3. 3. Selection of the scale and the size of drafting paper Selection of the scale and the size of drafting paper 选比例选比例、、定图幅定图幅 Drawing methods and procedure Drawing methods and procedure 画图方法和步骤画图方法和步骤 Example1 Example1 . Draw three views of posite solid. Draw three views of posite solid. 画综合组合体的三视图画综合组合体的三视图。。 4. 4. The drawing procedure The drawing procedure 画图基本步骤画图基本步骤 4 1. . Draw three views of the subtraction solid . 画切割