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What should be paid attention to when using large diameter elbow

2021-04-24 13:34:42
1. When the large elbow is bent, the outer arm wall of the middle layer is thinned under the action of tensile stress and the inner arm wall is compressed under the action of external force distance M. 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 decline of elbow quality. Therefore, in gbj235-82, the RX value and the outer thinning amount under various pressure levels are clearly specified, so as to control the value of Rx and SX and ensure the quality.
 
2. The position of the neutral axis is different from the bending method. In the top bending (compression bending) work, the neutral axis is about 1 / 3 away from the outer wall. In the rotary bending (back bending) work, the neutral axis is about 2 / 3 away from the outer wall. Therefore, it is beneficial to use rotary bending method for thin-walled pipe bending.
 
3. The bending accuracy of large elbow is also one of the factors affecting the quality of elbow. When we manufacture the bent tire, we not only need to control the specification and size within a certain tolerance range, but also require the user to select the corresponding bent tire according to the bending pipe diameter.

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