| Economic development efficiency of pipe bender
We need to use the technology of bending pipe processing in a lot of machinery manufacturing, so whether we have an understanding of it now? Below we first from some aspects to a simple understanding.
Large diameter cold-formed pipe is commonly used in long distance pipeline construction. It is made on site by vertical hydraulic pipe bender according to the actual direction of the pipeline and the required bending Angle measured. In the 21st century, the construction of long-distance pipeline projects in China has developed rapidly, and the landscape is complex and diverse. There are many mountains and hills along the pipeline and few plains, so the demand for cold-formed pipes is quite large. However, because many units participating in the construction lack experience in the production of cold-formed pipes, how to make high-quality cold-formed pipes is still in the exploratory stage. As a pipe bender manufacturer, in the process of pipe bender development, test and application, we have conducted deep research and test on how to ensure the quality of cold bent pipe bending, analyzed the common defects of cold bent pipe and put forward the control measures for your reference.
Each cold - bent pipe is made by several bends. The steel pipe is placed on the pipe bender, and the pipe bender exerts bending torque on the steel pipe to make proper deformation of the local steel pipe and form a certain Angle to achieve the purpose of bending. The basic process is as follows: the steel pipe is clamped by the back-end fixture, and then moves upward through the fulcrum of the main oil cylinder of the front end lower die to make the steel pipe bend and deform along the middle of the upper die curve until it is bent into a shape. In the process of pipe bending in Hangzhou, the deformation of steel pipe occurs on the upper die, which plays the role of fetal, and its curve is determined according to the critical value of plastic deformation of steel pipe of different specifications and different materials. Lu to different steel pipe corresponding to different upper die.
According to the causes of folding, we control from two aspects: on the one hand, during the bending process, the inner tube should not be placed near the front fixture side, but should be placed near the lower die bending cylinder side, and the back of the inner tube is about 150mm beyond the back of the upper tire. At the same time, in the first 3 times of bending, the lift of the bending cylinder should not be too large, and the lift of the bending cylinder should gradually increase in the subsequent process until the steel tube contacts the high point of the upper tire arc, so that the steel tube can be gently transition in the bending process, to ensure that the steel tube does not occur instability deformation. On the other hand, the inner tube is adjusted before bending the steel tube. When a tube is bent, the inner tube must be in a self-locking position and the inner wall of the steel tube can be bent. By taking the above measures, you can ensure that the steel pipe does not appear fold.
In the bending process, we found that the axial position of the inner tube was not easy to control, so we designed and made a positioning trolley, and used a pole to make a rigid connection between the inner tube and the trolley. When the inner tube coincides with the center line of the upper die, record the relative position of the car. When the steel tube moves to the rear axial direction after a bending operation is completed, the tube and the car move back together with a working length, and then loosen the expansion structure of the inner tube, start the inner tube motor, so that the tube and the car move forward together until the car returns to the original calibration position. In order to control the verticality of the inner tube, we adopted the position pointer, fixed it on the connecting pole, and marked the position mark on the nozzle. When the position pointer deflected, the inner tube was timely withdrawn and manual correction was carried out.
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