How to ensure the forming quality of the pipe bending machine? In order to ensure the forming quality of the pipe fittings, the degree of deformation must be controlled within the allowable range. The bending forming limit of the pipe not only depends on the mechanical properties of the material and the bending method, but also considers the use requirements of the pipe. The degree of deformation of the pipe of the pipe bender depends on the relative bending radius R/D and the relative thickness/D value. The smaller the R/D and tD values, the greater the degree of deformation. The forming limit of pipe fittings should include the following contents: The maximum elongation deformation in the tensile deformation zone outside the neutral layer does not exceed the allowable value of material plasticity to cause rupture; the compression deformation zone inside the neutral layer is subjected to tangential compressive stress The thin-walled part of the structure will not exceed the instability and wrinkle; if the pipe fitting has the requirement of ellipticity, control its section to produce distortion; if the pipe fitting has the strength requirement to withstand the internal pressure, control the forming limit of its wall thickness reduction. The automatic action process of the pipe bender is: after the system power is turned on, the pump station motor is started, the solenoid 9DT is energized, and the hydraulic pump is unloaded; manually put the pipe into the clamping cylinder positioning block, and press the clamping button (foot pedal) , 5DT is energized, the material clamp cylinder is extended to clamp the pipe; the loading trolley is manually sent to the next bending position, and the required space angle is turned, the automatic start button is pressed, and the next bend is repeated until the last one. The bend is completed, the hydraulic pump is unloaded, the pipe is manually unloaded, and the three-dimensional multi-bend of a pipe is completed. Delay 5s; 2DT, 7DT5 are energized, the bending cylinder and the booster cylinder work at the same time, and the booster cylinder applies the top-sensitive force to the workpiece. When the bending angle is 5~10 before the bending angle, the bending cylinder extends slowly. The bending angle is reached; 2DT, 7DT5 are powered off, 6DT, 8DT are powered on, the main clamp cylinder and the guide clamp cylinder are respectively retracted to the original position; 3DT is energized, the bending cylinder is retracted to the original position, and a bend is completed.
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