CNC bending machine is mainly used for power construction, highway and railway construction, bridges, ships, boiler pipe and other aspects of the laying and repairing, CNC bending machine has the advantages of simple operation, convenient movement, quick installation, bending machine in the domestic market dominant position of products, widely used, which has the technical characteristics that numerical control bending machine?
1. tube type regularization
To avoid excessive arc, arbitrary curve, compound bending and more than 180, the design and arrangement of pipes should be avoided. Arc. The arc is too large will not only make the tooling bulky, but also by the pipe bender machine size restrictions; arbitrary curve, composite bending design is not reasonable, greatly hindered the mechanization and automation of production, so that the operator is difficult to get rid of heavy physical labor is greater than 180. The arc causes the pipe bender to be unable to unload the die.
2. bend radius normalization
The bending radius to try to achieve "a tube of the first mock exam" and "- the first mock exam". For a tube, or several bending, bending angle, the bending radius is only one, because the pipe bender does not replace the module in the bending process, which is "a tube of the first mock exam". "- the first mock exam", that is the same diameter pipe should be used with a bending radius tube is also using the same set of bending modules of different shapes, which is conducive to reducing the number of modules.
3. proper radius of curvature
The size of the bending radius of the catheter determines the magnitude of the resistance of the catheter during bending. Generally speaking, large diameter, small bending radius, bending prone to internal wrinkle and slip phenomenon, bending quality is difficult to guarantee, so generally choose the R value of pipe bending die for the pipe diameter of 23 times as well.
4. moderate bending forming speed
The bending speed of the main effects on the forming quality is too fast, easy to cause the flat tube bending part, roundness is not up to the requirements, resulting in cracking, breaking the catheter; the speed is too slow, easy to cause catheter wrinkling and pressing block slip, large diameter pipe to form part of the sunken tube bending. In view of a large number of tests on the two NC bending machines, the bending speed of the pipe is determined to be 20%--40% of the maximum bending speed of the machine.
5. suitable mandrel and its location
In the bending process, the mandrel plays a major role in supporting the inner wall of the bend radius of the pipe to prevent its deformation. At present, domestic tubes are bent on machine tools, and the quality of them can not be guaranteed without mandrel. There are many kinds of mandrel, such as column core, universal single, double, three or four ball mandrel, directional single, multi ball head mandrel, etc.. In addition, the position of mandrel forming has some influence on the tube bending theory, its tangent tangent and bending die flush, but after a large number of experiments, ahead of time 1 ~ 2mm is better, the quality of bend ideal. Of course, the amount ahead of time will lead to the appearance of the so-called "goose head" on the outer wall of the curved part.
Note: This article is from the China Machine Tool Business Network

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