三视图怎么画
画三视图时候，看得见的轮廓线的投影画实线，看不见的轮廓线的投影画虚线。三视图定义：
能够正确反映物体长、宽、高尺寸的正投影工程图（主视图，俯视图，左视图三个基本视图）为三视图，这是工程界一种对物体几何形状约定俗成的抽象表达方式。
三视图的画法：
根据各形体的投影规律，逐个画出形体的三视图。画形体的顺序：一般先实（实形体）后空（挖去的形体）；先大（大形体）后小（小形体）；先画轮廓，后画细节。画每个形体时，要三个视图联系起来画，并从反映形体特征的视图画起，再按投影规律画出其他两个视图。对称图形、半圆和大于半圆的圆弧要画出对称中心线，回转体一定要画出轴线。对称中心线和轴线用细点划线画出。
底稿画完后，按形体逐个仔细检查。对形体中的垂直面、一般位置面、形体间邻接表面处于相切、共面或相交特殊位置的面、线，用面、线投影规律重点校核，纠正错误和补充遗漏。按标准图线描深，可见部分用粗实线画出，不可见部分用虚线画出。
When drawing orthographic views, the projection of visible contours should draw solid lines and the projection of invisible contours should draw dashed lines. Orthographic view definition: An orthographic projection drawing that correctly reflects the length, width and height of an object (Three basic views of the main view, top view, and left view) It is a three-view view, which is a conventional abstract expression of the geometry of objects in engineering. Drawing method of orthographic view: According to the projection rules of each body, draw the three views of each body. Order of drawing figures: Generally, first solid (solid) and then empty (cut out); First big (big) then small (small); Draw outlines first, details later. When drawing each figure, three views should be drawn together, and the other two views should be drawn according to the projection rule, starting from the visual picture reflecting the characteristics of the figure. Symmetrical figures, semicircles and arcs larger than semicircles should be drawn symmetrical centerline, and the revolving body must be drawn axis. Symmetrical centerlines and axes are drawn with a fine dot. After the manuscript is finished, examine it carefully according to the shape. For vertical plane, general position plane, surface of adjacent surface between bodies in special position of tangent, coplanar or intersecting, the plane and line projection rules shall be used to emphatically check, correct errors and supplement omissions. Draw the depth according to the standard line. The visible part is drawn with a thick solid line and the invisible part is drawn with a dashed line.
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