Factors that cause the quality of the pipe bending machine to weaken
The quality of the elbow directly affects the working efficiency of the Pipe bending machine. What factors will affect the quality of the elbow during the processing of the elbow?
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 understand the material, processing performance and surface corrosion of the pipeline being processed to make production judgments.
In pure bending, the outer arm wall of the neutral layer of the tube is thinned by tensile stress under the action of the external force M, and the inner side is subjected to compressive stress. The resultant force N1 and N2 make the cross section of the tube change. Based on this factor, the main reason for the decline in the quality of the elbow is RX and SX. Therefore, in GB1235-82, the RX value under various pressure levels and the amount of thinning on the outside are clearly specified. The purpose is to Control the value of RX and SX to ensure quality.
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 the elbow elbow method. When working in the top bending type (compression bending), the neutral axis is off. At about 1/3 of the outer wall, the neutral axis is 2/3 away from the outer wall during the turning work. Therefore, when thin-walled pipes are bent, it is beneficial to use the spin-bending method.
The accuracy of the bent tire is also one of the factors that affect the quality of the elbow. When we manufacture bent tires, in addition to the specification and size requirements to be controlled within a certain tolerance range, we also require users to select the corresponding bent tires according to the bent tube diameter when using.
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