Setting-out of 45-degree inclined opening of circular tube

Layout of 45-degree inclined opening of circular tube:

1. Draw a square with the pipe diameter as the side length at the pipe to be cut, draw a diagonal line so that the diagonal line is consistent with the direction you want to cut, and then cut according to this diagonal line. This method is simple and practical, but it must have a certain foundation, otherwise there will be some errors.

2. The unfolded pattern is generally laid out by intersecting line method, and there is no calculation formula. Drawing software is more convenient. Many elbows are called "shrimp waist". ?

3. Manual lofting steps: (Take a section as an example, other methods are the same) 1) Draw the side projection of the elbow according to the actual size. Include seam lines. 2) Divide each closed wireframe graph into independent graphs according to lines. (You can cut it or draw it separately. 3) Take a pattern and draw it on another piece of paper (the center line is vertical). Draw two horizontal lines that are parallel up and down along the height of the pattern, perpendicular to the center line, and the length is exactly the circumference of the pattern diameter.

4. Divide the pattern vertically and mark it, and then draw these bisectors vertically into the unfolded rectangle just drawn. Note that the points on the flat pattern must correspond to the points on the projected pattern. 5) Divide the diagonal on the pattern into equal parts along the horizontal direction. And the corresponding points. The smooth connection of intersection points obtained on the expanded sample is an expanded curve. The denser the bisection, the more accurate the curve. 6) Release the biting amount and deal with the thickness of the plate. When cutting an elbow, you must know the bending radius, thickness and section.