The main reason for the decrease of the quality of the elbow and the method of attention

　　1, pure bending, the role of the tube in the external force M under the role of the outer layer of the lateral wall of the tensile stress & 1 role of thinning, the lateral compression stress. The role of thickening, together N1 and N2 to make the pipe cross-section changes. Based on this factor, the main reason for the decline in the quality of the elbow is the main reason for the RX and SX. Therefore, GBJ235-82, the various pressure levels in the case of the RX value and the amount of lateral thinning are made clear, the purpose is to control the RX With the value of SX, thus ensuring quality.

　　2, the front has been said,316L 5D Efw Stainless Steel Bend Pipe Fitting when the material outside the tensile, the medial compression of the neutral axis position and the elbow method is different from the top bending (compression bending) work when the neutral axis from the outer wall about 1 / 3, the neutral shaft is at 2/3 from the outer wall when working in the corner (back bend). Therefore, thin-walled pipe bending, the use of rotary method is useful.

　　3, bending the accuracy of the bend is also one of the factors affecting the quality. We in the manufacture of bending foot, in addition to the size of the specifications required to control a certain range of tolerance, but also requires the user in accordance with the use of curved diameter selection of the corresponding bending tire.