The quality of the bending pipe directly affects the efficiency of the pipe bending machine. What factors will affect the quality of the bending pipe in the process of processing?
1. The bendability and surface corrosion of the pipe itself may also affect the quality of the elbow pipe. During site construction, the operator also needs to know the material of the pipeline being processed, the processing performance and make a judgment on the surface corrosion.
2. In pure bending, the outer arm wall of the neutral layer is thinned by tensile stress under the action of the outer force distance M, and the inner side is compressed by stress. The combined forces N1 and N2 change the cross section of the tube. Based on this factor, the main reason for the quality decline of the elbow pipe is RX and SX. Therefore, in GBJ235-82, the RX value and the thinning amount of the outside under various pressure levels are clearly stipulated, in order to control the value of RX and SX, so as to ensure the quality.
3. As mentioned before, the lateral tension of the material in the elbow bending pipe is different from that in the elbow bending method. The neutral axis is about 1/3 away from the outer wall when the top bending type (compression bending) works, and the neutral axis is 2/3 away from the outer wall when the rotary bending works. Therefore, it is beneficial to use the rotary bending method for thin wall pipe bending.
4. The precision of the bent tire is also one of the factors affecting the quality of the elbow elbow. When we manufacture the curved tire, in addition to the specification and size requirements to control in a certain tolerance range, but also requires users to choose the corresponding curved tire according to the bending pipe diameter when using.
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