Large diameter elbow manufacturing process: cutting and welding
Large diameter elbow is bent by a complete set of bending dies. No matter what kind of machinery and equipment, most of them are used for elbows. aircraft and their engines.
Precautions for the use of large diameter elbows:
1. When making large-diameter elbows, the elbow is pulled on the outside of the material, and the position of the neutral axis under pressure on the inside is different from the elbow method. During the top-bending (compression bending) operation, the neutral axis is about 1 1 from the outer wall. /3, the neutral axis is at 2/3 away from the outer wall when working in a twisting (return-bending) position. Therefore, thin-walled pipes are bent, and it is beneficial to use the whirling method.
2. The bending accuracy of the large-diameter elbow is also one of the factors that affect the quality of the elbow. When we manufacture curved tires, in addition to the specification and size requirements to be controlled within the tolerance range, we also require users to select the corresponding curved tires according to the curved pipe diameter when using them.
3.When the large-diameter elbow is bent, the outer arm wall of the neutral layer of the pipe is thinned by tensile stress under the action of the external force distance M, 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 RX with the value of SX, and thus the quality.
BBN Steel is specialized in producing Large diameter elbow. If you want to know more about Large diameter elbow, please feel free to contact us.