断面图的画法与标注(课堂PPT).ppt

,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,单击此处编辑母版标题样式,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,单击此处编辑母版标题样式,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,单击此处编辑母版标题样式,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,单击此处编辑母版标题样式,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,单击此处编辑母版标题样式,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,单击此处编辑母版标题样式,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,单击此处编辑母版标题样式,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,单击此处编辑母版标题样式,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,单击此处编辑母版标题样式,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,单击此处编辑母版标题样式,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,单击此处编辑母版标题样式,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,单击此处编辑母版标题样式,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,单击此处编辑母版标题样式,*,断面图的画法与标注,数控技术专业课程改革成果教材,机械识图,1,断面图的画法与标注,看 一 看,仔细观察轴的功用及结构,视 频,减速器的三维,模拟爆炸视频,导,教学过程,2,断面图的画法与标注,实物轴零件测绘草图的视图表达,说一说,议一议,1,、各组的表达方案都合理吗？,各有什么优劣？,2,、有没有更为简便的表达方式？,导,教学过程,3,一、断面图的概念,什么叫断面图？,链,教学过程,4,比一比,说一说,议一议,根据断面图的概念，讨论,断面图与剖视图,有何,区别,？,任 务 一,一、断面图的概念,链,教学过程,5,评一评,断面图,面的投影,断面形状,剖视图,体的投影,内部结构,本质区别,一、断面图的概念,链,教学过程,6,三 步 曲,切割,分离,投影,看一看,议一议,断面图如何形成？,评一评,二、移出断面图的画法与标注,析,7,二、移出断面图的画法与标注,做一做,打开绘图包自学完成用,CAD,绘制测绘,轴的视图。,任 务 二,画,8,二、移出断面图的画法与标注,评一评,关键点：,剖切符号,键槽绘制,1,粗实线画剖切符号,2,粗实线绘制断面轮廓线,3,细实线绘制剖面线,剖切位置,+,投影箭头,画,9,二、移出断面图的画法与标注,做一做,打开绘图包在指定位置作出断面,图，键槽深度为,6mm,，孔为销孔,任 务 三,画,10,二、移出断面图的画法与标注,评一评,画,11,圆孔,圆锥坑,销孔,结构特点：由回转面形成的,二、移出断面图的画法与标注,画,12,圆孔,圆锥坑,仔细观察与之前绘制的,断面图有什么区别？,二、移出断面图的画法与标注,画,13,回转面形成的结构，断面图应按,照剖视绘制。,特殊规定,圆孔,圆锥坑,销孔,断面图的画法与标注,画,14,断面图的画法与标注,改一改,打开绘图包指出图形中的错误，,并予以改正。,任 务 四,画,15,二、移出断面图的画法与标注,连一连,打开绘图包，找出指定位置的断,面图并连一连。,任 务 五,标,16,二、移出断面图的画法与标注,讲一讲,标注的三要素,字 母,剖切符号,剖切线,标,17,二、移出断面图的画法与标注,做一做,打开绘图包通过利用教材,P180181,和,网络学习平台，以小组为单位，完成标,注粘贴及下列表格，并展示结果。,任 务 六,标,18,二、移出断面图的画法与标注,做一做,任 务 六,标,19,二、移出断面图的画法与标注,口 诀,注字母：图在延长线，字母不出现,图在其他处，字母必须注,画箭头：断面若对称，箭头可以省,断面不对称，箭头来指明,评一评,标,20,断面图的画法与标注,课 堂 小 结,画法：,一般规定,如：键槽,不封闭,特殊规定,如：销孔、圆孔、圆锥坑,封闭,标注：知识口诀,打开任务单，完成思考与实践。,评一评,填写学习评价表,任 务 七,做一做,理一理,验,教学过程,21,作业布置,巩固模块,自学模块,作出制定位置的断面图,课 后 拓 展,拓,教学过程,22,谢 谢！,23,