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Factors causing the weakening of the quality of the pipe bending machine

Factors causing the weakening of the quality of the pipe bending machine

Issue Time:2022/08/03
The quality of the elbow directly affects the efficiency of the pipe bending machine. What factors will affect the quality of the elbow during the processing of the elbow?
1. The bendability and surface corrosion of the pipe itself may also affect the quality of the elbow. During on-site construction, the operator also needs to know the material of the pipeline to be processed, the processing performance and make a production judgment on the surface corrosion.
2. During pure bending, under the action of the external force distance M, the outer arm wall of the neutral layer is thinned by tensile stress, and the inner side is subjected to compressive stress. The thickness increases due to the action, and the resultant forces N1 and N2 change the cross-section of the pipe. Based on this factor, RX and SX are the main reasons for the quality reduction of elbows. Therefore, in GBJ235-82, the RX value and the outer thinning amount under various pressure levels are clearly specified. The purpose is to Control the values ​​of RX and SX to ensure quality.​​
3. As mentioned in the previous article, when the elbow is bent, the outer side of the material is stretched, and the position of the neutral axis under pressure on the inner side is different from that of the elbow elbow method. About 1/3 of the outer wall, the neutral axis is at 2/3 away from the outer wall during the bending work. Therefore, thin-walled pipes are bent, and it is beneficial to use the whirling method.​​
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4. The accuracy of the bending tire is also one of the factors affecting the quality of the elbow. When we manufacture curved tires, in addition to the specification and size requirements to be controlled within a certain tolerance range, we also require users to select corresponding curved tires according to the bending pipe diameter when using.
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