《組合體讀圖》PPT課件.ppt

1、Outline of reading 讀圖要點 Methods of reading 讀圖的方法 Exercises 練習題,Reading Views of Composite Solids 組合體的讀圖,請點擊相應(yīng)標題顯示其內(nèi)容,Outline of reading 讀圖要點,1. Understanding the meaning of individual lines and other drawing elements of the view. 要讀懂視圖中圖線、線框的含義。,(2) Each closed loop of lines/curves represents: 視圖上每一

2、封閉線框可表示:,請點擊鼠標左鍵顯示后面內(nèi)容,(1) Lines and curves (including circular arcs) represent the following: 視圖上圖線有直線、曲線(包括圓弧)，它們表示:,B,1) The projection of accumulation planes. 具有積聚性表面的投影。,2) The projection of intersection of two planes. 兩表面交線的投影。,3) The projection of the outline of cylindrical surfaces. 曲面輪廓線的投影

3、。 ,A,C,1) The projection of a plane. 平面的投影。,2) The projection of a curved surface. 曲面的投影。,3) The projection of a curved surface and its tangent plane. 曲面與其切平面的投影。,I,Outline of reading 讀圖要點,2. Reading several views simultaneously. 要幾個視圖聯(lián)系起來讀。,One view may not be able to reveal general space shape of

4、composite solids. 一個視圖是不能反映物體的確切形狀的,故讀圖時不可孤立地只看一個視圖。,Example 1. Think of the left view from the given front view. 根據(jù)主視圖,想象其側(cè)視圖是何形狀。,請點擊鼠標左鍵顯示后面內(nèi)容,When reading drawings, we should not make a conclusion after reading only one or two views. We should carefully compare all views and make a conclusion un

5、til they can be fully explained following the principles of projection. 在讀圖過程中切忌看了一、二個視圖就下結(jié)論，各視圖要反復對照，直至都符合投影規(guī)律時,才能最后下結(jié)論。（注意:二個視圖有時也不能反映物體的確切形狀）,Example 2. Think of the left view from given views. 根據(jù)主、俯視圖,想象其側(cè)視圖是何形狀。,請點擊鼠標左鍵顯示后面內(nèi)容,Outline of reading 讀圖要點,2. Reading several views simultaneously. 要幾個視

6、圖聯(lián)系起來讀。,3. Reading starts from a view that most reflects shape characteristics. 要從反映形狀特征的視圖讀起。,While reading, we must pay special attention to the character view for identifying the basic shape of the composite solid. 看圖時，應(yīng)抓住特征視圖，確定組合體基本形狀。,4. Analyzing relative position and intersection of neighbor

7、ing surfaces. 要認真分析相鄰表面間的相互位置和交線。,請點擊鼠標左鍵顯示后面內(nèi)容,Outline of reading 讀圖要點,While reading, we should also pay attention to relative locations, such as front-and-back, tall-and-low and intersection locations. 讀圖時，要注意分析相鄰面的前后、高低和相交等相互位置。,Example 3. Think of the solid shape from the given top view. 根據(jù)俯視圖想象

8、該立體的結(jié)構(gòu)形狀。,The general procedure of reading is as follows: first read the primary component, then read the other components; first read easy components, then read difficult components; first read the overall shape for each component, then read shape details. 讀圖一般順序：先看主要部分,后看次要部分；先看容易確定的部分,后看難于確定的部分；先

9、看某一組成部分的整體形狀,后看其細節(jié)部分形狀。,1. Shape analysis method. 形體分析法,Methods of reading 讀圖的方法,(2)Comparison of drawing elements. 對線框；,(1)Partition of drawing elements. 分線框；,(3)Understanding the shape from the drawing elements.看線框識形體；,請點擊鼠標左鍵顯示后面內(nèi)容,(4)Overall imagination. 綜合想象。,Example 6. Draw the left view of th

10、e hybrid construction solid. 畫綜合式組合體左視圖,Methods of reading 讀圖的方法,We partition the composite solid into individual boundary surfaces. We analyze and identify the space shape of the individual surfaces and their relative locations following the principles of projection. We can further determine inters

11、ection curves/lines and their relative locations and finally imagine the overall space shape of the composite solid. 把組合體分成若干個面，根據(jù)其投影特點確定其空間形狀和相對位置,并判別交線的空間形狀和相對位置,從而想象出組合體的形狀。,Example 4. Complete the left view by adding the missing detail. 補畫組合體左視圖,Example 5. Draw the left view of the subtraction c

12、omposite solid. 畫切割式組合體左視圖,2. Analysis of lines and planes. 線面分析法,Exercises 練 習 題,Draw the front view of the composite solid. 已知俯視圖，想象物體形象，畫出主視圖。,5. Select the left view which is correctly drawn. 根據(jù)所給主、俯視圖，找出正確的左視圖。,3. Draw the plan view of the composite solid. 已知主視圖，想象物體形象，畫出俯視圖。,4. Draw the left v

13、iew of the composite solid. 已知主、俯視圖，想象物體形象，畫出左視圖。,請點擊題目顯示其內(nèi)容,6. Analyze the component using shape method. 運用形體分析法，讀懂組合體，完成以下作業(yè)。,2. Draw the plan view of the composite solid. 已知主視圖，想象物體形象，畫出俯視圖。,本 小 節(jié) 結(jié) 束,謝謝您的認真學習！,退出,前一頁,請點擊鼠標左鍵顯示后面內(nèi)容,4.Complete the left view by adding the missing detail. 補全切割式組合體的左

14、視圖。,Steps 作圖步驟：,Analyze the component. 先分析各線框,再 確定其結(jié)構(gòu)形狀。,(2) Draw the missing detail. 確定其在左視圖的位置并補全所缺圖線。,前上方切三棱柱,前后左右切半圓錐,5. Draw the left view of the subtraction composite solid. 畫出切割式組合體的左視圖。,請點擊鼠標左鍵顯示后面內(nèi)容,Steps 作圖步驟：,(1)Construct the complete left view. 先畫出未切割時的左視圖。,(2)It could be obtained on the

15、 circle following the accumulation. 由截平面的積聚性投影確定其在各視圖中截交線的投影位置。,（3 ) Check and draw with regular lines. 檢查后判別可見性, 擦去被截切部分,按 標準圖線加深各視圖。,畫半圓階梯孔投影,畫切兩邊條形投影,畫出切通孔的投影,6. Draw the left view of the hybrid construction solid. 畫出綜合式組合體的左視圖。,Step 1 第1步： Analyze of lines and planes 行進線面分析,稍低,底面,更后,最后面,最前,最前,請點

16、擊鼠標左鍵顯示后面內(nèi)容,每一條線可能表示： 1.具有積聚性表面的投影； 2.兩表面交線的投影； 3.曲面輪廓線的投影。,每一封閉線框可能表示： 1.平面圖形的投影； 2.曲面圖形的投影。 3.曲面與其切平面的投影。,次低,（見雙語習題集第23頁）,a）Analyze the front view. 先從主視圖由上而下逐線分析。,b）Analyze the top (plane) view. 再從俯視圖由前向后逐線分析。,次后,較后,易多線,易多線,易多線,易多線,易多線,請點擊鼠標左鍵顯示后面內(nèi)容,Step 2 第2步： Construction the third view. 畫第三視圖。,

17、6. Draw the left view of the hybrid construction solid. 畫出綜合組合體的左視圖。,請點擊解答顯示其內(nèi)容,1. Draw the front view of the composite solid. 已知俯視圖，想象物體形象，畫出主視圖。,(1) (2) (3) (4),請點擊解答顯示其內(nèi)容,2. Draw the plan view of the composite solid. 已知主視圖，想象物體形象，畫出俯視圖。,(1) (2) (3) (4),請點擊解答顯示其內(nèi)容,3. Draw the plan view of the comp

18、osite solid. 根據(jù)主視圖,想象物體形狀,畫出俯視圖。,請點擊解答顯示其內(nèi)容,4. Draw the left view of the composite solid. 根據(jù)主、俯視圖，畫出組合體左視圖。,（1）,（2）,（）,（ ),請點擊解答顯示其內(nèi)容,5. Select the left view which is correctly drawn. 根據(jù)所給主、俯視圖，找出正確的左視圖。,Shape and surface analysis 進行形體、線面分析,（1）Draw the three views of shape. 畫出形體的三面投影圖。 （2）Draw the t

19、hree views of shape . 畫出形體的三面投影圖。 （3）Draw the three views of shape . 畫出形體的三面投影圖。 （4）Draw the three views of shape . 畫出形體的三面投影圖。 （5）Analyze the relation positions between surface plane of the composite solid. 分析組合體相鄰表面之間的相對位置關(guān)系。 , 形體與是 , 形體與是 , 形體與是 , 形體與是 .,相交,（6） Draw the top view. 畫出形體的三面投影圖。,相切,相切,相交,請點擊解答顯示其內(nèi)容,Analyze the component using shape analysis method. 運用形體分析法，讀懂組合體，完成以下作業(yè)。,（見雙語習題集第22頁）,Tangency,Tangency,Int