Cut-out manual cut-out recruitment network

With the development and progress of society, many people want to learn a technology. Elbow and tee lofting technology has become the first choice of many enthusiasts. However, without the guidance of teachers, the lofting of elbows and tees is difficult to learn, and there must be a certain lofting foundation.

Many netizens have asked me about the laying methods of various pipe fittings. To be honest, it's really hard to say clearly. Some students don't understand the basics at all, so they want to become masters quickly. Setting-out is accurate and simple, just use appropriate unfolding software. With the progress of society, lofting technicians now use practical software for lofting, which saves time and effort, and is convenient and fast. But some people still want to learn manual lofting skills and understand the principle.

Here are some simple manual elbow deployment methods that I have summarized.

1, the development diagram of sheet metal is generally developed by intersecting line method, and there is no calculation formula. Drawing software is more convenient.

Manual lofting steps: (Take the first paragraph 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, draw it on another piece of paper (the center line is vertical), and draw two horizontal lines that are parallel up and down along the height of the pattern, perpendicular to the center line and with length.

It's just the perimeter of the pattern diameter. (closed rectangle)

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 unfolded 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.

2. Drawing method of shrimp waist and elbow (taking 90 as an example, other angles are the same)