工程制图开放实验三指导书.doc

工程图学与虚拟设计实验室工程制图开放实验三指导书机器测绘分项目组进行装配体测绘2007年1月 机器测绘开放实验指导书一、典型零件的测绘 Mapping of common parts 实验内容：完成轴、齿轮、螺纹等的测绘。Project contents: map parts like shafts, gears, screw threads etc. 实验目的：掌握量具的使用及测绘的方法，更好地培养学生的实际动手能力，正确使用测绘工具。Objective: ensure that students master usages of measuring tools and have stronger practical abilities. 实验要求：根据给定的轴、齿轮、螺纹进行测绘，运用已学过的基本知识，计算出有关尺寸，如螺距、齿 轮的有关参数等。Requirements: Calculate dimensions and parameters like screw pitch, diameter of gear pitch circle etc.二、铸造零件的测绘 Mapping of casting parts 实验内容：完成对支架、底座或壳体等铸造零件的测绘。Contents: Map brackets, grinding wheel heads or valves in spraying machine. 实验目的：掌握量具的使用及测绘的方法，更好地培养学生的实际动手能力，正确使用测绘工具。Objective: ensure that students master usages of measuring tools and have stronger practical abilities. 实验要求Requirements: 根据给定的铸造零件进行测绘，运用已学过的基本知识，计算出有关尺寸，如螺距、孔中心距等的有关参数等。 Calculate dimensions and parameters like screw pitch, diameter of gear pitch circle etc. by given casting parts. 分析需测绘的零件结构形状，选定表达方案 ,画出零件的草图，测量并标注尺寸,编写必要的技术要求，绘制正规零件图。 Analyze structures of parts to map, select representation methods and complete sketches. Measure and obtain dimensions of the parts, compile necessary technical requirements and complete detail drawings.三、根据给定的机器或部件画出装配图 Complete assembly drawing by detail drawings 实验内容：画出机器或部件的装配图Contents: complete a assembly drawing of a flat nose clamp 实验目的：进一步培养综合表达能力和画装配图的能力Objective: improve students abilities of detail drawing reading and assembly drawing plotting 实验要求Requirements:1. 在画装配图之前，必须对所画的装配体有全面的认识，即要充分了解它的工作原理、结构特点，并仔细阅读所测绘的一套零件图，根据每个零件的位置，找出各零件间的装配关系，画出装配示意图。 Complete information of the flat nose clamp, work principles and structures for example, should be obtained before starting its assembly drawings. First, detail drawings are read carefully and shape of each part is imagined; then assembly relationships between parts are specified by sketches of the clamp.2. 根据装配体的示意图和零件图画出它的装配图，由于该部件较复杂，所以必须认真选定表达方案，并考虑标注尺寸、序号、明细栏、标题栏等所占位置，选定图幅，合理布局，并按画装配图的步骤进行，完成全图。Assembly drawing is finished according to the sketches and detail drawings. First, representation methods should be selected carefully for the complexity of the assembly. Then, sizes of drawing sheets are decided according to positions of dimensions, item references, item lists and title blocks. Layout of drawings should be reasonable. Finally assembly drawing is finished according to the steps of drawing assembly drawings. 弄懂工作原理 Work principles of flat nose clamp：以平口钳为例：平口钳是用来夹持工件进行加工用的部件。它主要由固定钳身、钳口板、丝杠和套螺母等组成。丝杠固定在固定钳身上。转动丝杠可带动套螺母作直线移动。套螺母与活动钳口用螺钉连成整体，因此，当丝杠转动时，活动钳口就会沿固定钳身移动。这样钳口闭合或开放用以夹紧或松开工件。Flat nose clamp is used to grip parts. It is mainly composed of a fixed body, a movable clamp body, a screw and a nut. The screw is fixed on the fixed clamp body, and the nut on the movable clamp body. When the screw is rotated, the nut moves in straight way, w