Q235 steel materials bend, factory direct, low price.

1, pure bending, tube outer torque M under which the role of the outer layer arm wall tensile stress & a thinning effect and medial compressive stress. The role of thickening, N1 and N2 together so that the tube cross-section changes. Based on this factor, the main reason for the decline in the quality caused by bending RX and SX So, GBJ235-82 in the RX value and volume thinned various pressure levels outside the case made it clear that the purpose is to control the RX and the values ??SX, thereby ensuring the quality. 2, the preceding article has been talked about, when the material is pulled outside of the elbow, the inside pressure of the neutral axis location where the different methods and elbow, curved at the top (compression bending) working from the outer wall of the neutral axis is about 1 / 3, in the rotation curve (curved back) to work from the outer wall of the neutral axis is 2/3. Therefore, the thin-walled pipe bending, bending method using spin is beneficial. 3, precision bent tire is one of the factors affecting the quality of the elbow. We manufacture bent tire, except when the size requirements to control certain tolerance range, it also requires the user to select the appropriate bend when used in accordance with the bending diameter tires. 4, the pipe itself bendable performance and surface corrosion, may also affect the quality of the elbow. When the construction site, the operator should also learn to be material processing pipeline, processing performance and corrosion on the surface to produce judgments. 5, now available R. (Bending radius / tube diameter) relationship graphs (as shown), in time for the user to choose the relationship between the tube diameter and wall thickness of the reference. This figure reflects the relative emphasis bending radius, the relative thickness of the impact on the quality of the elbow, according to pipeline processing acceptance: cold-formed steel pipe is, low pressure for 4D, high pressure to 5D. So we bend tire designed for R = 4D (special case separately), so I plant mainly concerned bender select SX-based relative wall thickness, the upper figure is mandrel-free zone, the central figure ordinary mandrel section, the lower part of Fig special mandrel section. Due to the special design and manufacture of the mandrel are very difficult, the operation is not easy, it is generally not available factory. Special circumstances may be agreed.