文档介绍：Mapping the Parts
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****题
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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。
Methods and steps to map parts
零件测绘的方法和步骤
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Part mapping is useful
for duplicating an existing
part or repairing damaged
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。
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
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Methods and steps to map parts
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。
After measuring, draw the sketch map. 经测量后画
出零件草图。
Draw the detail drawing. 画正
式零件图。
First, one should know the part.
首先了解零件.
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
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
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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
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。
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
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
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。
5) The results of measuring the thread, keyway, and gear teeth should be checked with
standardized values and standard structures should be used to facilit