# Simplified Representation Simplified Representation 简化画法 Conventional Representation Conventional Representation 规定画法 Exercises 练习题 Simplified and Conventional.

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Simplified Representation Simplified Representation 简化画法 Conventional Representation Conventional Representation 规定画法 Exercises 练习题 Simplified and Conventional Representation Simplified and Conventional Representation 简化画法与规定画法 请点击相应标题显示其内容

60° 1. If a part obtains some same features （ such as gear, slot etc.) 1. If a part obtains some same features （ such as gear, slot etc.) which are distributed according to certain rules, it is only needs to which are distributed according to certain rules, it is only needs to draw several whole features and use center line to indicate their draw several whole features and use center line to indicate their center position and label the total number in the part drawing. center position and label the total number in the part drawing. 当多个相同结构（孔、槽、齿等）按规律分布时, 只需画出一个或几个完 整的结构, 其余用细实线连接或用细点划线标明中心位置, 并注明总数。 当多个相同结构（孔、槽、齿等）按规律分布时, 只需画出一个或几个完 整的结构, 其余用细实线连接或用细点划线标明中心位置, 并注明总数。 请点击鼠标左键显示后面内容 Simplified Representation 简化画法 9 slots 6 holes 20 teeth 英国图例

2.Long parts (such as shaft, pole and so on) varying profiled bar length by length by a certain rule can be shorten to represent length by length by a certain rule can be shorten to represent The conventional representation of breaks is used to shorten. The conventional representation of breaks is used to shorten. 较长的机件（轴、杆等）沿长度方向的形状一致或按一定的规律变化 较长的机件（轴、杆等）沿长度方向的形状一致或按一定的规律变化 时，可断开后缩短绘制，断裂处用波浪线表示, 其尺寸仍按实长标注。 时，可断开后缩短绘制，断裂处用波浪线表示, 其尺寸仍按实长标注。 请点击鼠标左键显示后面内容 Simplified Representation 简化画法 断开后只画其两端 Staff Staff棱柱形长杆Shaft圆柱形长轴 Tube Tube圆柱形长管 断开后斜度度应一致。 断开后斜度应一致 Sign trim size 英国图例

4. The view of symmetrical part can be drawn a half or quarter of it, two continuous thick lines paralleling with each other should be two continuous thick lines paralleling with each other should be drawn on the two ends of center lines. drawn on the two ends of center lines. 在不致引起误解时，对称机件的视图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。 在不致引起误解时，对称机件的视图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。 Simplified Representation 简化画法 英国图例 请点击鼠标左键显示后面内容 左右对称可只画半边，应在中心线两端加与其垂直的平行线符号 上下左右均对称可 只画 1/4, 应在中心 线两端加与其垂直的平行细实线符号

5. Reticulation material, weaving material and diamond 5. Reticulation material, weaving material and diamond knurling should be indicated with continuous thick lines. knurling should be indicated with continuous thick lines. 网状物、编织物及机件上的滚花部分，应用粗实 网状物、编织物及机件上的滚花部分，应用粗实 线完全或部分地表示出来。 线完全或部分地表示出来。 Straight m0.8 直纹 Diamond m 0.8 斜网纹 请点击鼠标左键显示后面内容 Simplified Representation 简化画法 Cross-hatch m 0.8 直网纹 Knurling m0.8 滚花 英国图例

Simplified Representation 简化画法 Simplified Representation 简化画法 7. It is permitted to omit cutting symbols when it would not be mistaken, but the labeling of the cutting positions and cuts shall obey the rules. Small fillets or 45°chamfers are permitted to omit, but they should be illuminated in engineering requirements. Small fillets or 45°chamfers are permitted to omit, but they should be illuminated in engineering requirements. 在不致引起误解时，零件图中的移出断面图，允许省略剖面符号，但剖切位 置和断面图的标注必须遵守规定。 在不致引起误解时，零件图中的移出断面图，允许省略剖面符号，但剖切位 置和断面图的标注必须遵守规定。 在不致引起误解时，零件图中的小圆角、锐边的小倒圆或 45° 小倒角允许省 略不画，但必须注明尺寸或在技术要求中加以说明。 在不致引起误解时，零件图中的小圆角、锐边的小倒圆或 45° 小倒角允许省 略不画，但必须注明尺寸或在技术要求中加以说明。 请点击鼠标左键显示后面内容 省略小圆角 省略小圆角 省略倒角 省略剖面符号 省略剖面符号 英国图例

Simplified Representation 简化画法 Simplified Representation 简化画法 8.Structures with small pitch in a part could be drawn according to its small end if expressed in one view. to its small end if expressed in one view. If circle or arc has the included angle of 30° or less than 30° If circle or arc has the included angle of 30° or less than 30° to projective plane, its projection can be expressed with a circle to projective plane, its projection can be expressed with a circle or arc directly. or arc directly. 机件上斜度不大的结构，如在一个图形中已表达清楚，则 机件上斜度不大的结构，如在一个图形中已表达清楚，则在其他图形中可按小端画出。 与投影面倾斜角度 30° 的圆, 其投影可用圆或圆弧来代替。 与投影面倾斜角度 30° 的圆, 其投影可用圆或圆弧来代替。 请点击鼠标左键显示后面内容 按小端的 宽度画出 均按圆 形画出

1. Symmetrically located ribs or spokes are shown in section in revolved positions to show the ribs true size. Rib’s or spokes are not section-lined in section. 对于机件的肋、轮辐及薄壁等，如按纵向剖切，这些结 构都不画剖面符号，而用粗实线将它与其邻接部分分开。 对于机件的肋、轮辐及薄壁等，如按纵向剖切，这些结 构都不画剖面符号，而用粗实线将它与其邻接部分分开。 Rib 肋板不画 剖面符号 肋板不画 剖面符号 Rib 肋板 不画 剖面 符号 Cutting plane 剖切面位置 请点击鼠标左键显示后面内容 Conventional Representation 规定画法 Conventional Representation 规定画法 英国图例

2. A part with symmetrically located ribs, spokes and holes are shown in section with those symmetrically features rotated to the cutting plane. 当机件回转体上均匀分布的肋、轮辐、孔等结构不处于剖切面 上时，应将这些结构旋转到剖切面上画出。 当机件回转体上均匀分布的肋、轮辐、孔等结构不处于剖切面 上时，应将这些结构旋转到剖切面上画出。 将肋板转到 剖切面位置 后再画出 将孔转到剖切面位置再画出 将孔转到 剖切面位 置再画出 将孔转到剖切面位置再画出 请点击鼠标左键显示后面内容 Conventional Representation 规定画法 Conventional Representation 规定画法 英国图例

Exercises 练习题 1.Analysis and find out the mistakes from sectional views and correct the front view. 分析并找出剖视图中的错误，画出正确主视图 分析并找出剖视图中的错误，画出正确主视图 分析并找出剖视图中的错误，画出正确主视图。 分析并找出剖视图中的错误，画出正确主视图。 2. Sketch full sectional views for each drawing. 画出下列各立体的全剖视图。 请点击题目显示其内容

1. Analysis and find out the mistakes from sectional views and correct the front view. 分析并找出剖视图中的错误，画出正确主视图。 分析并找出剖视图中的错误，画出正确主视图。肋按纵向剖切时不画剖面线 画出。画出。画出。画出。 画出 。 画出。画出。画出。画出。 回转体 上均匀 分布的 肋和孔 不在剖 切面上 时，应 旋转到 剖切面 画出。 请点击击解答显示其内容 (1)(2)

Representation of Rib 肋板表达 Representation of Rib 肋板表达 IncorrectCorrect 请点击鼠标左键显示后面内容 画剖面线。 If the cutting plane passes crosswise through a rib or web, spoke,thin wall,etc. the member should be section-lined. 若沿横向剖切肋板、 轮辐、薄壁等结构 时应画剖面线。

Representation of Rib 肋板表达 Representation of Rib 肋板表达 英国标准 BS 308 有关规定 英国标准 BS 308 有关规定

Simplified Representation 简化画法

Simplified Representation 简化画法 Simplified Representation 简化画法

Simplified Representation 简化画法

Simplified Representation 简化画法 Simplified Representation 简化画法

Simplified Representation 简化画法 省略剖面线 为方便注尺 寸需画虚线

Conventional Representation 规定画法 Conventional Representation 规定画法

Conventional Representation 规定画法 BS 308 states that the following are NOT sectioned even if they are ‘cut’ longitudinally. 英国标准 BS308 规定 : 当沿纵向剖切下列机件时, 均按不剖画。 Shafts Keys Rivets Pins Dowels Cotters Studs 轴 键 铆钉 销钉 暗销 开口销 螺柱 Screw Bolts Nuts Washers Spokes Webs or Ribs 螺钉 螺栓 螺母 垫圈 轮辐 薄壁或肋板 Web(Rib)肋板 Bolt螺栓 Washer 垫圈 Nut 螺母 Key 键 请点击鼠标左键显示后面内容 Shaft轴

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