2. Mapping the Parts Mapping the Parts 零 件 的 测 绘 零 件 的 测 绘 Methods and steps to map parts 零件测绘的方法和步骤 Remarks on part mapping 零件测绘时的注意事项 Measuring methods for dimension 零件尺寸的测量方法 Exercise 练习题 请点击相应标题显示其内容

3. To map a part drawing based on an existing physical part, one may first measure its dimensions, figure out its technical requirements, and then elaborate the working drawing according to sketches from the measurement. To map a part drawing based on an existing physical part, one may first measure its dimensions, figure out its technical requirements, and then elaborate the working drawing according to sketches from the measurement. 零件的测绘是根据实际零件画出草图，测量零件各部分的 尺寸，确定技术要求，再根据草图画出零件的工作图。 零件的测绘是根据实际零件画出草图，测量零件各部分的 尺寸，确定技术要求，再根据草图画出零件的工作图。 零件的测绘工作图 零件的测绘工作图 Methods and steps to map parts 零件测绘的方法和步骤 零件测绘的方法和步骤 请点击鼠标左键显示后面内容 Part mapping is useful Part mapping is useful for duplicating an existing part or repairing damaged parts. 一般在仿制机器 parts. 一般在仿制机器和修配损坏的零件时，需要进行零件测绘。

4. Analyzing the part 分析零件 Determining representation 确定表达方案 Drawing the sketch map 画零件草图 Producing the detail drawing 画零件图 请点击鼠标左键显示后面内容 Methods and steps to map parts 零件测绘的方法和步骤 零件测绘的方法和步骤 Determine the front view and other views. 确定主视图和其他视图。 确定主视图和其他视图。 经测量后画 After measuring, draw the sketch map. 经测量后画出零件草图。 画正 Draw the detail drawing. 画正式零件图。 First, one should know the part. 首先了解零件. 首先了解零件.

5. 1) Manufacturing defects of the part, such as sand and air holes, tool marks and wearing, should not be drawn. 零件的制造缺陷, 如砂眼、气孔、刀痕以及长 wearing, should not be drawn. 零件的制造缺陷, 如砂眼、气孔、刀痕以及长 期使用所造成的磨损都不应画出。 期使用所造成的磨损都不应画出。 Remarks on part mapping 零件测绘时的注意事项 请点击鼠标左键显示后面内容 2) The technical structure originated from manufacturing or mounting, such as curving of castings, chamfer, escape, dummy club and recess, should be drawn and can not of castings, chamfer, escape, dummy club and recess, should be drawn and can not be omitted. 零件上因制造、装配的需要而形成的工艺结构，如铸造圆角、 be omitted. 零件上因制造、装配的需要而形成的工艺结构，如铸造圆角、 倒角、退刀槽、凸台、凹坑等，都必须画出，不能忽略。 倒角、退刀槽、凸台、凹坑等，都必须画出，不能忽略。 3) Draw only basic fitting dimensions （ for example, the diameter of the fitted hole and shaft). Its system of fits and corresponding tolerance should be determined by shaft). Its system of fits and corresponding tolerance should be determined by consulting the manual after the analysis. 有配合关系的尺寸（如配合的孔和轴 consulting the manual after the analysis. 有配合关系的尺寸（如配合的孔和轴 的直径）, 一般只要测出它的基本尺寸, 其配合性质和相应的公差值, 应在分 的直径）, 一般只要测出它的基本尺寸, 其配合性质和相应的公差值, 应在分 析考虑后, 再查阅有关手册确定。 析考虑后, 再查阅有关手册确定。 4) Non-fitting or unimportant dimensions are allowed to be adjusted to integers. 无配合关系的尺寸或不重要的尺寸, 允许将测得的尺寸适当调整为整数。 无配合关系的尺寸或不重要的尺寸, 允许将测得的尺寸适当调整为整数。 5) The results of measuring the thread, keyway, and gear teeth should be checked with standardized values and standard structures should be used to facilitate production. standardized values and standard structures should be used to facilitate production. 对螺纹、键槽、齿轮的轮齿等标准结构的尺寸, 应该把测量的结果与标准值 对螺纹、键槽、齿轮的轮齿等标准结构的尺寸, 应该把测量的结果与标准值 核对, 采用标准结构尺寸, 以利于制造。 核对, 采用标准结构尺寸, 以利于制造。

6. 1)Measuring linear dimensions It can be measured directly using a ruler. Sometimes one can measure them by combining a triangular rule with a regular ruler. 测量直线尺寸 一般可用直尺直接测量, 有时也可用三角板 测量直线尺寸 一般可用直尺直接测量, 有时也可用三角板 与直尺配合进行测量。若要求精确时, 则用游标卡尺测量。 与直尺配合进行测量。若要求精确时, 则用游标卡尺测量。 Measuring methods for dimension 零件尺寸的测量方法 零件尺寸的测量方法

7. Measuring methods for dimension 零件尺寸的测量方法 零件尺寸的测量方法 2)Measuring the internal (inside) and external (outside) diameters of the revolving body Measure the external diameter with external of the revolving body Measure the external diameter with external calipers and the internal diameters with internal calipers. calipers and the internal diameters with internal calipers. 测量回转体的内外径 测量外径用外卡钳, 测量内径用内卡钳 。 测量回转体的内外径 测量外径用外卡钳, 测量内径用内卡钳 。

8. Measuring methods for dimension 零件尺寸的测量方法 零件尺寸的测量方法 请点击鼠标左键显示后面内容 3)Measuring wall thickness Combine external calipers with a ruler (wall thickness X=A - B ). calipers with a ruler (wall thickness X=A - B ). 测量壁厚 可用外卡钳与直尺配合使用, 测量壁厚 可用外卡钳与直尺配合使用, 壁厚为 X = A - B 。 壁厚为 X = A - B 。 4)Measuring hole pitches Measure related dimensions with external calipers, and dimensions with external calipers, and calculate hole pitches A=a+d/2+d/2. calculate hole pitches A=a+d/2+d/2. 测量孔间距 用外卡钳测量相关尺寸, 再进 测量孔间距 用外卡钳测量相关尺寸, 再进 行计算, 孔间距 A=a+d/2+d/2 。 行计算, 孔间距 A=a+d/2+d/2 。

9. Measuring methods for dimension 零件尺寸的测量方法 零件尺寸的测量方法 请点击鼠标左键显示后面内容 5)Measuring the height of the axle hole’s center Measure related dimensions with the external calipers and the ruler, and calculate the center height of the axle hole ( A=B+d/2+D/2 ). dimensions with the external calipers and the ruler, and calculate the center height of the axle hole ( A=B+d/2+D/2 ). 测量轴孔中心高 用外卡钳 测量轴孔中心高 用外卡钳 及直尺测量相关尺寸, 再进 及直尺测量相关尺寸, 再进 行计算, 轴孔中心高 A=B+D/2 。 行计算, 轴孔中心高 A=B+D/2 。 6)Round measuring Using a fillet gage. Each set of the fillet gage has several slices, the radius of which are different. Each set of the fillet gage has several slices, the radius of which are different. 测量圆角 用圆角规测量, 每套圆 测量圆角 用圆角规测量, 每套圆 角规有很多片, 其圆弧半径均不同。 角规有很多片, 其圆弧半径均不同。

10. Measuring methods for dimension 零件尺寸的测量方法 零件尺寸的测量方法 7)Measuring threads For threads measurement, one needs to measure the diameter and the pitch. For external threads, measure measure the diameter and the pitch. For external threads, measure the large diameter and the pitch. For internal threads, measure the the large diameter and the pitch. For internal threads, measure the small diameter and the pitch. Then, determine the standardized small diameter and the pitch. Then, determine the standardized values by consulting the manual. values by consulting the manual. 测量螺纹 测量螺纹要测出直径和螺距的数据。对于外螺纹, 测 大径和螺距 ; 对于内螺纹, 测小径和螺距, 然后查手册取标准值。

11. Measuring methods for dimension 零件尺寸的测量方法 零件尺寸的测量方法 8)Measuring the gear First, measure the diameter of the addendum circle with a vernier caliper, and then calculate the number of teeth circle with a vernier caliper, and then calculate the number of teeth and the gear module. and the gear module. 测量齿轮 先用游标卡尺测量齿轮的齿顶圆直径，再数齿 测量齿轮 先用游标卡尺测量齿轮的齿顶圆直径，再数齿 数，然后计算齿轮模数。 数，然后计算齿轮模数。

12. Exercises 练习题 3. Map and produce the detail drawing of “Valvebody 3. Map and produce the detail drawing of “Valve body of spray appliance”. of spray appliance”. 测绘并画出 “ 喷洒机阀体 ” 零件的零件图。 测绘并画出 “ 喷洒机阀体 ” 零件的零件图。 测绘并画出 “ 喷洒机阀体 ” 零件的零件图。 2. Map and produce the detail drawing of “ Bracket of grinding wheel”. grinding wheel”. 测绘并画出 “ 砂轮头架 ” 零件的零件图。 测绘并画出 “ 砂轮头架 ” 零件的零件图。 测绘并画出 “ 砂轮头架 ” 零件的零件图。 1. Map and produce the detail drawingof the “ Bracket”. 1. Map and produce the detail drawing of the “ Bracket”. 测绘并画出 “ 支架 ” 零件的零件图。 测绘并画出 “ 支架 ” 零件的零件图。 测绘并画出 “ 支架 ” 零件的零件图。请点击解答显示其内容

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14. 请点击鼠标左键显示后面内容 Methods and steps to map parts 零件测绘的方法和步骤 零件测绘的方法和步骤 Valve cover. The part name: Valve cover. 名称 : 阀盖 ZG25. Material: ZG25. 材料 : 铸钢 Function: Used for cover the ball valve. 用途 : 用于盖球阀的盖子 Structure: The plates have flanges and four evenly arranged through holes. 结构形状 : 盘形并带有凸缘和均布的通孔 Machining: The castings made by founding and machining. 加工方法 : 该铸件经铸造后进行机加工 Requirements: Aging treatment and fillet radii R1 ～ 3. 要求 : 需要经过时效处理, 铸造圆角半径为 要求 : 需要经过时效处理, 铸造圆角半径为 R1 ～ 3mm. First, one should know the part name, material, function, structure and machining shapes, as well as other requirements. 首先了解零件的名称、材料、用途及各部分的结构形状、加工 方法和要求等。 首先了解零件的名称、材料、用途及各部分的结构形状、加工 方法和要求等。

15. 请点击鼠标左键显示后面内容 Methods and steps to map parts 零件测绘的方法和步骤 零件测绘的方法和步骤 Choosing the front view: one should adopt full sectional front views to show the stepped holes.采用全剖的主视图以表达阶梯通孔。 Determine the front view and other views. 确定主视图和其他视图。 确定主视图和其他视图。 Choosing other views: Adopt side views to convey its external structure and the distribution 用左视图表达外形及孔的分布情况。 of the holes. 用左视图表达外形及孔的分布情况。S

16. 经测量后徒手画出零件草图。 After measuring, draw the sketch map. 经测量后徒手画出零件草图。 请点击鼠标左键显示后面内容 Methods and steps to map parts 零件测绘的方法和步骤 零件测绘的方法和步骤 1) Draw the border, title block, arrange and draw the datum line. 2) Adopt appropriate presentations to draw the views. 3) Draw the border, dimension line and arrow and deepen the thick lines. 4) Measure the dimensions, fill in the dimension values, technical requirements and title block.

17. 请点击鼠标左键显示后面内容 Methods and steps to map parts 零件测绘的方法和步骤 零件测绘的方法和步骤 画正式零件图。 Draw the detail drawing. 画正式零件图。

18. The rest 其余 （ ） Notes 技术要求 请点击鼠标左键显示后面内容 Mapping the Part 零件的测绘 Use A2 drawing paper, scale is 1  1, producing the detail drawing 用 A2 图纸, 按照 1  1 比例, 画出零件工作图. The name of the part ： Vale body of spray appliance. 零件名称 : 喷洒机阀体 Material : HT200. 材 料： 灰铸铁 Function: Used for vales connection three pipelines. 用 途 : 起安装连接三管路阀门的作用。 Project 1 方案 1 Project 2 方案 2 Title block 标题栏 英国图样标题栏

19. FINISH AS CAST OR TO BS1134 WHERE STATED THREADS TO BS 3643 Vale seat with three pipelines FILLET RADII R3 MM ALL DIMENSIONS IN mm DIG NO. 1 ORIGINAL SCALE 1 :1 PROJECTION MATERIAL CAST IRON 10 TO BS 310 DRAWN DATE CHECKED DATE TOLERANCE CAST DIMS±1.5 MACHINED DIMS ±0.2, The rest ( ) 请点击鼠标左键显示后面内容 Mapping the Part 零件的测绘 Use A2 drawing paper, scale is 1  1, producing the detail drawing 用 A2 图纸, 按照 1  1 比例, 画出零件工作图. The name of the part ： Vale body of spray appliance. 零件名称 : 喷洒机阀体 Material : HT200. 材 料： 灰铸铁 Function: Used for vales connection three pipelines. 用 途 : 起安装连接三管路阀门的作用。

20. Project 1 喷洒机阀体 Project 1 喷洒机阀体 表达方案 1 Mapping the Part 零件的测绘

21. Project 2 喷洒机阀体 Project 2 喷洒机阀体 表达方案 2 Mapping the Part 零件的测绘

22. The rest 其余 （ ） Notes 技术要求 Use A2 drawing paper, scale is 1  1, producing the detail drawing 用 A2 图纸, 按照 1  1 比例, 画出零件工作图. The name of the part ： Bracket of grinding wheel. 零件名称 : 砂轮头架 Material : HT150. 材 料： 灰铸铁 Function: Used for supporting grinding wheel. 用 途 : 起支承砂轮头的作用。 请点击鼠标左键显示后面内容 Project 1 方案 1 Project 2 方案 2 Mapping the Part 零件的测绘 英国图样标题栏 Title block 标题栏

23. FINISH AS CAST OR TO BS1134 WHERE STATED THREADS TO BS 3643 Bracket of grinding wheel FILLET RADII R3 MM ALL DIMENSIONS IN mm DIG NO. 1 ORIGINAL SCALE 1 :1 PROJECTION MATERIAL CAST IRON 10 TO BS 310 DRAWN DATE CHECKED DATE TOLERANCE CAST DIMS±1.5 MACHINED DIMS ±0.2, The rest ( ) 请点击鼠标左键显示后面内容 Mapping the Part 零件的测绘 Use A2 drawing paper, scale is 1  1, producing the detail drawing 用 A2 图纸, 按照 1  1 比例, 画出零件工作图. The name of the part ： Bracket of grinding wheel. 零件名称 : 砂轮头架 Material : HT150. 材 料： 灰铸铁 Function: Used for supporting grinding wheel. 用 途 : 起支承砂轮头的作用。

24. Project 1 Project 1 砂轮头架 表达方案 1 Mapping the Part 零件的测绘

25. The rest 其余 （ ） Notes 技术要求 Project 1 方案 1 Project 2 方案 2 Title block 标题栏 请点击鼠标左键显示后面内容 Mapping the Part 零件的测绘 Use A2 drawing paper, scale is 1  1, producing the detail drawing 用 A2 图纸, 按照 1  1 比例, 画出零件工作图. The name of the part ： Bracket. 零件名称 : 支架 Material : HT150. 材 料： 灰铸铁 Function: Used for supporting bearings. 用 途 : 起支承轴承的作用。 英国图样标题栏

26. FINISH AS CAST OR TO BS1134 WHERE STATED THREADS TO BS 3643 BRACKET FILLET RADII R3 MM ALL DIMENSIONS IN mm DIG NO. 1 ORIGINAL SCALE 1 :1 PROJECTION MATERIAL CAST IRON 10 TO BS 310 DRAWN DATE CHECKED DATE TOLERANCE CAST DIMS±1.5 MACHINED DIMS ±0.2, The rest ( ) 请点击鼠标左键显示后面内容 Mapping the Part 零件的测绘 Use A2 drawing paper, scale is 1  1, producing the detail drawing 用 A2 图纸, 按照 1  1 比例, 画出零件工作图. The name of the part ： Bracket. 零件名称 : 支架 Material : HT150. 材 料： 灰铸铁 Function: Used for supporting bearings. 用 途 : 起支承轴承的作用。

27. 请点击鼠标左键显示后面内容 Project 1 Project 1 支架 表达方案 1 Mapping the Part 零件的测绘

28. Project 2 Project 2 支架 表达方案 2 Mapping the Part 零件的测绘

31. 在图片上点击鼠标左键可以 “ 暂停 ” 或再次 “ 播放 ”