第1个回答 2023-01-10
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.