2. Copy is completed, and the front view is projected according to the first angle method. There are some unnecessary lines. Delete it, leaving only the shape and keyhole.
Description of drawings: The dotted line indicates the thickness of invisible material. After the diagonal line is bent, the diagonal line is the projection of the edge line before welding. The white straight frame inside is the projection of the edge line of the bent sheet metal. Dimension line and the center line, there are two short dotted lines on both sides of the center line, and the dotted lines represent invisible round holes.
3. Delete completed. Shortcut key of CAD deletion: E+ space, select the line segment to be deleted with the mouse, and E+ space to delete.
4. Copy the top view to the above picture. Mirror the top view to the top of the chart. CAD shortcut key: copy CO+ space; Mirror MI+ space. And delete redundant line segments, mainly dotted lines.
5. Use the CAD offset command to offset the left and right two long line segments. The spacing is the bending dimension 25 marked on the drawing. Because there is no left view in this example drawing, it is proved that there are no holes or other features in the left view. You can draw it directly. CAD offset shortcut key: O+ space. Connect the broken line segments in the middle.
6. Complete the unfolded drawing of the first bend of the sheet metal part. Let's adjust the calculated expansion size first. The bending coefficient of Q235 material 1mm is 1.7. The above figure does not subtract the bending coefficient, so you need to draw this step first and subtract the bending coefficient 1.7.
7. The dimension measured after stretching is completely consistent with the above figure. When stretching the upper and lower sides, be sure to choose a round hole.
8. Generally, the sheet metal of a door panel has a long side and a short side. This means that the inner surface of the wall thickness of the metal plate after the long side bending is attached to the thick surface of the side fabric after the short side bending.
9. Modify the upper and lower short edges. The vertical lines on both sides of the short side are offset to the middle 1. 1 mm, (why not 1 mm? Increase the clearance of 0. 1mm to ensure that the bending angle can reach 90 degrees. )
10. Trim redundant line segments. Trim command: TR+ space
1 1. The first sheet metal bending is basically completed, and the second sheet metal bending is carried out.
12. Move the hypotenuse of the upper and lower trapezoid to align with the vertical line. Ensure that the material thickness will not overlap after bending, and the workpiece will not be scrapped or the tool will resist. And pruning redundant line segments.
13. The four corners are the same. Start setting the second unfolding bending coefficient. Move the four outer trapezoids to the center by 1.7mm respectively. And trim the redundant line segments.
14. Finally, delete redundant auxiliary lines.
15. At this point, the sheet metal development diagram is basically completed. In order to make the bending sharp corner beautiful, there is no process hole at the bending corner. 1mm can be used without bending process holes.