It is determined that China's automobile market and construction machinery market will continue to maintain good growth in a long period of time, thus deciding the good prospects of China's pipe bending machine market growth. And benefit national industrial policy, downstream industry huge demand for our numerical control bending machine industry has won precious development opportunities, constantly improving consumption power and regional revitalization program, the emergence of infrastructure construction and other factors. But our country is now the demand for low-end bender is still very large, obviously the industrial level is not as foreign industrial developed countries. The level of machinery manufacturing industry substantially reflects a national industrial level, numerical control pipe bending machine is called the work machine of high-end equipment manufacturing industry, the self-sufficiency rate of high-end numerical control pipe bending machine industry in China is seriously low, and there is a great gap with the world advanced countries in the design of research and development, material process, parts and so on.

There are three types of overall failure of bending components of pipe bending machine:

1, strength failure: because the rod end bending moment member may occur strength failure, rod section local has a large weakening may also produce strength failure.

2, bending failure: the role in an axis of symmetry plane bending moments of bending members, if in the direction of the bending moments have enough support to prevent artifacts occur lateral displacement and torsion, it will only happen in bending moments of plane and component deformation form has not changed, is still the bending moments of in-plane bending deformation.

3. Bending-torsion instability failure: if the lateral side of the bending member lacks enough support, it is also possible to have bending-torsion instability failure. In this case, except for the bending deformation in the plane of bending moment action, the bending deformation will suddenly occur in the direction perpendicular to the bending short action. At the same time, the section twists around the rod axis. The bidirectional bending bending member always fails in space bending and torsion.

As a part of the plate component is compressed, the flexural component also has local buckling problem, just like the axially compressed component. Similar to the axial force members, for the normal service limit state, the tension-bending and compression-bending members also meet the stiffness requirements by limiting their slenderness.