How to prevent the bending defect phenomenon of the bending machine?

Pipe bending machine can be divided into automatic bending machine, CNC bending machine, hydraulic bending machine, etc.Mainly used for electric power construction, public railway construction, boiler, bridge, ships, furniture, decoration and other pipeline laying and maintenance, many functions, reasonable structure, simple operation, convenient operation, fast installation speed, etc.So, how to prevent the bending machine from bending defects?Specific can be from the following points: the process characteristics of small radius bending pipe determine the thinning of the arc outer wall, which is inevitable.In order to avoid excessive thinning, the commonly used effective method uses the bending machine with booster device or top push device on the tail, in order to offset part of the resistance of the bending, improve the stress distribution on the cross-section of the pipe, and move the neutral layer out to reduce the thinning of the outer wall of the pipe.For the pipe fittings with severe flattening on the outside of the arc without the core bending pipe, the compression mold is designed as a structural form with reverse deformation groove: in the core bending pipe, the appropriate cordurol should be selected for correct installation. When installing the mold, the pipe groove axis of each component is on the same level plane.Corresponding measures should be taken according to the wrinkle area inside the arc.If the front cutting point is wrinkled, then the cordurol position shall be adjusted to achieve the reasonable support for the pipe when bending: when the rear cutting point is wrinkled, the anti-wrinkle block shall be installed correctly, and then the die force shall be adjusted to the appropriate position.If the inside of the arc is covered with wrinkles, it means that the diameter of the cordurol used is too small, so that the gap between the cordurol and the pipe wall is too large, or the molding force is too small, so that the pipe fits well with the bending mold and anti-wrinkle block in the bending process.Therefore, the cordurol should be replaced, and the pressing mold should be adjusted to force the mold properly.The compensation method and correction method are mainly used to control the bending rebound phenomenon. The compensation method is to estimate the rebound amount based on the influencing factors in the bending process.When designing and making the mold, the working component dimensions and geometry of the convex and concave mold are modified to realize & quot; positive & quot; bending.The correction method is to take measures in the mold structure to make the correction force concentrated at the corner, change the stress state, eliminate the elastic deformation, overcome the rebound, such as applying the tensile force while bending, so that the whole section is under the tensile stress, unloading the elastic recovery and the deformation direction, so as to significantly reduce the rebound.For the outer bending of the pipe, first ensure that the pipe has a good heat treatment state, then check whether the pressure of the pressing mold is too large, adjust the pressure properly to ensure good lubrication between the manrol and the pipe wall to reduce the resistance of the pipe and the friction between the inner wall of the pipe and the corrol.