What is the main reason for the decline of the wear-resistant pipe quality
Analysis and method of bending quality decline caused by the main reason:
1, pure bending, tube in the external force under the action of M from the layers of the lateral arm wall stress & 1and thinning of the inner pressure, stress. Effect of thickening, heli N1 and N2 make the tube cross sectionchange. On the basis of these factors, cause the quality of bend down the main reason for the RX and SX so,GBJ235 - 82, for various pressure levels under the condition of RX value and lateral thinning Liangjun made clear, the purpose is to control the RX and SX values, so as to ensure the quality of.
Article 2, has been told, elbow material lateral tension, neutral axis location of medial compression and bending method and different, in bending type (compression bending) work from the neutral axis in the outer wall about 1 /
3, the rotating bending (back bend type) work, the neutral axis in 2 / 3 from the wall. Therefore the thin-wall pipe bending, using a rotating bending method is useful.
One of the 3, bending precision but also affect the fetal bending quality factor. We bent tire manufacturing, in addition to size requirements of control within a certain tolerance range, but also requires the user to use according to the bending diameter corresponding to the selected curved tread.
4, pipe itself can bend properties and the surface corrosion, may also affect the quality of bend. Construction site, the operator also needs to understand the pipeline is processed materials, processing properties and thesurface corrosion make judgment.
5, we provide R. (bending radius / pipe diameter) curve (as shown in Figure 3), reference for users in the selection of pipe diameter and wall thickness of the relationship. This figure highlights the relative bending radius,the relative wall thickness influence on the bending quality, according to the acceptance of pipeline processing:steel pipe cold bending, low 4D, high pressure 5D. The curved tread design our R=4D (special cases separately),so in terms of bending machine produced by our factory is mainly to select relative wall thickness SX, figure is at the upper part of the mandrel free zone, the central figure for common core area, the lower the special graphcore shaft area. The design and manufacture of special core shaft are very difficult, the operation is not very convenient, so I generally should not be. Special circumstances can be agreed.
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