机械专业英语课件5.pptVIP

上一课回顾 单词复习： 1.locate 2.clamp 3. Mass production 4. Screw/Bolt/Nut 5.torque 6.washer 7.helical spring lockwasher Lesson 5 Working Drawing 生产图纸 重点词汇： 1.implement 2.detail drawing 零件图 3. specification n. 技术要求 4.represent 5.consolidate 6.tolerance 公差 7.title block 标题栏 8.association Paragraph 1 Working Drawings are the drawings from which a design is implemented. All principles of orthographic projection(正交投影) and techniques of graphics(制图技术) can be used to communicate the details of a project in working drawings. 工作图是将设计变为实际产品所依据的图样。所有的正投影（orthographic projection）原理和绘图技术都可用来在工作图中表达项目中的细节。 A detail drawing(零件图) is a working drawing of a single part (or detail) within the set of working drawings. 零件图(detail drawing)是在一整套工作图中一个零件（或细节）的工作图。 Paragraph 2:  Specifications(技术要求) are the written instructions that accompany working drawings. When the design can be represented on a few sheets, the specifications are usually written on the drawings to consolidate(将…合并…) the information into a single format. 技术要求（specificaion）是工作图中所附的文字说明部分。当一个设计方案需要用几张图纸来表示时，通常将技术要求以统一(consolidate)的格式写在工作图上 。 Paragraph 3: All parts must interact with other parts to some degree to yield the desired function from a design(设计期望的功能). 所有的零件都必须在某种程度上与其他零件相互影响，以产生设计方案中要求的功能。 Before detail drawings of individual parts are made the designer must thoroughly analyze the working drawing to ensure that the parts fit properly with mating parts, that the correct tolerances are applied, that the contact surfaces are properly finished, and that the proper motion is possible between the parts. 在绘制零件图之前，设计人员应该对工作图进行透彻的分析，以保证每个零件与其他零件有适当的配合，所标注的公差（tolerance）准确无误，接触表面具有适当的粗糙度，零件之间可以产生正确的运动。 Paragraph 4: Much of the work in preparing working drawings is done by the drafter(绘图员), but the designer, who is usually an engineer, is responsible for their correctness. It is working drawings that bring products and systems into being. 在准备工作图时，大部分工作由绘图员来完成，但设计人员通常是工程师，要对图纸的正确与否负责。正是工作图使产品得以生产或建造出来。