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钣金加工工艺常见视图介绍
（1）识图方法
(1) knowledge maps of
Get a three-view, how to understand its spatial shapes? This is a space plane to the process of drawing sheet metal is
relatively simple, and here introduce a basic side Figure France - physical analysis. The so-called shape analysis, is to
analyze the basic shape of the object is a combination of which, one by one to find out the basic shape of each projection, to
clear their spatial shape, then the root According to the basic form of the composition and the relative position between the
body, similar to the shape of the whole space. Third view is drawn using orthographic principle, each view can only express the
shape of the object in one direction, but does not reflect the object of all, it must be several views Figure when Lian Ji from
View. For some more complex shapes of objects, using only the three view still can not clearly express the shape of the object,
which needs the other side of the projection view of the right view, looking up maps, after View, and auxiliary view: If
cutaway view, profile, local zoom map.
拿到一张三视图，如何看懂它的空间形状呢？这是一个由平面到空间的过程，钣金加工图纸相对来说是比较简单的，这里介绍一种看图的基本方
钣金加工工艺常见视图介绍
法—-形体分析法。所谓形体分析法，就是分析物体是由哪些基本形状组合而成的，逐一找出每个基本形体的投影，想清楚它们的空间形状，再根
据基本形体的组合方式和各形体之间的相对位置，相像出整体的空间形状。
三视图是采用正投影原理画出来的，每一个视图只能表达物体的一个方向的形状，而不能反映物体的全部，所以看图的时候必须几个视图联系起
来看。对于一些形状比较复杂的物体，只采用三个视图都还不能清楚的表达出物体的形状，这就需要借助其它面的投影视图右视图、仰视图、后
视图，及辅助视图：如剖视图、剖面图、局部放大图等。
（2）钣金加工工艺常见视图介绍
三视图简介
Third view is the observer observed from three different locations with a spatial geometry and draw graphics.
Provisions of the human eye parallel projection lines, and then opposite the object look at the past, will see the outline of
an object by orthogonal touyingfa draw out the graph known as the view. An object six A View: From front to rear projection of
objects from the view that the main view - to reflect the shape of the object in front, from the objects on view for the
following projected income Said vertical view - to reflect the shape of the object above, objects left from the right
projection for the left view from the view that - to reflect the shape of the object on the left, there are three other
View is not very common. 3 view is the main view, top view, left view of the general. A view can only reflect the position of
the shape of an object, can not completely reflect the structure of the object shape. Third view is from three different
directions on the projection of the same objects results There are also such as profiles, such as supporting half-profile, the
expression of the basic objects to complete the structure.
Three-view projection rules are:The main, vertical length of the positive Primary visual, left high flush Left, vertical width
equal to
三视图是观测者从三个不同位置观察同一个空间几何体而画出的图形。
将人的视线规定为平行投影线，然后正对着物体看过去，将所见物体的轮廓用正投影法touyingfa绘制出来该图形称为视图。一个物体有六个视图
从物体的前面向后面投射所得的视图称主视图——能反映物体的前面形状，从物体的上面向下面投射所得的视图称俯视图——能反映物体的上
面形状，从物体的左面向右面投射所得的视图称左视图——能反映物体的左面形状，还有其它三个视图不是很常用。三视图就是主视图、俯视图
、左视图的总称。
一个视图只能反映物体的一个方位的形状，不能完整反映物体的结构形状。三视图是从三个不同方向对同一个物体进行投射的结果，另外还有如
剖面图、半剖面图等做为辅助，基本能完整的表达物体的结构。
三视图的投影规则是：
主视、俯视 长对正
主视、左视 高平齐
左视、俯视 宽相等（3）第三角投影法touyingfa简介
三视图有两种画法：第三角投影法touyingfa和第一角投影法touyingfa，这两种投影法touyingfa均符合ISO国际标准。目前，中国、德国等国家采用第一角投影法touyingfa，美国、日本等国家则采用第三角投影法touyingfa，在实际生产过程中我们也经常会见到第三视角的图纸。两种投影法touyingfa的不同之处：
第一角投影法touyingfa是将物体放在投影面与观察者之间
第三角投影法touyingfa是将投影面放在物体与观察者之间
所以两种投影法touyingfa所得的视图，在表示物体前后位置关系上是相反的：
第一角视图：左视图放右边，右视图放左边，俯视图放下面，依此类推；
第三角视图：左视图放左边，右视图放右边，俯视图放上面，依此类推；
在国际标准中，为区别两种画法，规定了两种画法的标记符号，如右图。
（4）钣金加工工艺常见视图介绍
机械制图简介：钣金加工工程图也属于机械制图的范畴，机械制图是用图样确切表示机械的结构形状、尺寸大小、工作原理和技术要求的学科。图样由图形、符号、文字和数字等组成，是表达设计意图和制造要求以及交流经验的技术文件，常被称为工程界的语言。在机械制图标准中规定的项目有：图纸幅面及格式、比例、字体和图线等。在图纸幅面及格式中规定了图纸标准幅面的大小和图纸中图框的相应尺寸比例是指图样中的尺寸长度与机件实际尺寸的比例，除允许用1:1的比例绘图外，只允许用标准中规定的缩小比例和放大比例绘图。在中国，规定汉字必须按长仿宋体书写，字母和数字按规定的结构书写。图线规定有八种规格，如用于绘制可见轮廓线的粗实线、用于绘制不可见轮廓线的虚线、用于绘制轴线和对称中心线的细点划线、用于绘制尺寸线和剖面线的细实线等。机械图样主要有零件图和装配图，零件图表达零件的形状、大小以及制造和检验零件的技术要求；装配图表达机械中所属各零件与部件间的装配关系和工作原理；表达零件结构形状的图形，常用的有视图、剖视图和剖面图等。视图是按正投影法即零件向投影面投影得到的图形。按投影方向和相应投影面的位置不同，视图分为主视图、俯视图和左视图等。视图主要用于表达机件的外部形状。图中看不见的轮廓线用虚线表示。零件向投影面投影时，观察者、机件与投影面三者间有两种相对位置。机件位于投影面与观察者之间时称为第一角投影法投影面位于机件与观察者之间时称为第三角投影法两种投影法都能同样完善地表达机件的形状。中国国家标准规定采用第一角投影法
(4) Mechanical Drawing Description: Sheet metal processing engineering drawings also belong to the scope of mechanical drawing, mechanical drawing machines is that the structure of the exact pattern shape, size, working principle and technical requirements of the school Section. Design by the graphics, symbols, words and numbers etc., is to express design intent and manufacturing requirements, and exchange of experience of technical documentation, often referred to as the language of engineering. In mechanical drawing standard Provisions include: drawing format and the format, scale, fonts, and graph lines. In the drawing format and the format of the standard format specified in the drawing size and drawing in the corresponding box size ratio is the pattern The size of the actual size of the length and the proportion of parts, in addition allows the ratio of 1:1 mapping, the only allowed to use the standard set forth in the narrow ratio and zoom ratio of the drawing. In China, the provisions of characters must be long Italics writing, letters and numbers written in the required structure. Chart provides for eight types of specifications, such as contour lines used to draw visible thick solid line, used to draw contour lines dotted line is not visible, used to draw Symmetry axis and crossed the center line of the fine points, used to draw dimension lines and section lines of the thin solid lines. There are parts mechanical design drawings and assembly drawings, parts express parts diagram the shape and size as well as manufacturing And test parts of the technical requirements; the expression of mechanical assembly drawings of parts and components in their inter-relations and working principle of the assembly; expression of structure and shape of the graphic parts, there are common views, cutaway view, and profile control Surface maps. Orthography of the view is based on the projection plane projection parts are the graphics. Projection direction and the corresponding projection plane according to the location of different view points-based view, top view and left view and so on. View Mainly used to express parts of the external shape. Contour map with invisible dotted lines. Parts to the projection plane projection, the observer, the three projection plane parts and the relative position between the two. Mechanical position In the projection plane and observers referred to as the first angle projection in the projection plane parts and observers referred to as the first two projection angle projection method can express the same sound mechanical shape. China National standard using the first angle projection |
