elbow

Bends are bent using a complete set of bending equipment, which can be divided into two processes: cold bending and hot pushing. Regardless of the type of machinery, equipment, and pipelines, most of them use bent pipes, mainly for oil, gas, infusion, engineering and bridge construction, etc

Usage:

Analysis of the main reasons for the quality decline of bent pipes and precautions:

1. When pure bending, the outer arm wall of the intermediate layer of the pipe is subjected to tensile stress under the action of external force distance M;

; Thin due to the action of 1, with compressive stress on the inner side. The combined force of N1 and N2 causes a change in the cross-section of the pipe, resulting in thickening. Based on this factor, the main reasons for the decrease in the quality of bent pipes are RX and SX. Therefore, GBJ235-82 has made clear provisions for the RX values and the thinning amount on the outside under various pressure levels, in order to control the values of RX and SX and confirm the quality

2. As mentioned earlier, when bending, the material is subjected to tension on the outer side and compression on the inner side. The position of the neutral axis is different from the bending method. In the top bending (compression bending) operation, the neutral axis is located about 1/3 of the outer wall, while in the rotary bending (return bending) operation, the neutral axis is located 2/3 of the outer wall. Therefore, the use of rotary bending method is beneficial for thin-walled pipeline bending

3. The accuracy of the bent tire is also one of the factors affecting the quality of the bent pipe. When manufacturing bent tires, in addition to controlling the specifications and dimensions within a certain tolerance range, we also require users to choose the corresponding bent tire based on the bent pipe diameter during use

4. The bendability and surface corrosion of the pipe itself may also affect the quality of the bent pipe. During on-site construction, operators also need to understand the material, processing performance, and surface corrosion of the processed pipeline to make production judgments

5. R is now provided. The curve chart of the relationship between bending radius and pipe outer diameter is provided for users to refer to when selecting the relationship between pipe diameter and wall thickness. Reflecting the influence of relative bending radius and relative wall thickness on the quality of bent pipes, according to the acceptance standards for pipeline processing: cold-formed steel pipes are 4D for medium and low pressure, and 5D for high pressure. Therefore, our bending tire design is R=4D (subject to special circumstances), so for the pipe bending machine produced by our factory, the main choice is to choose the relative wall thickness SX. The upper part of the figure is the area without a core shaft, the middle part is the ordinary core shaft area, and the lower part is the special core shaft area. Due to the difficulty in designing and manufacturing special core shafts, as well as the inconvenience in operation, our factory generally does not supply them. Special situation

6. The impact of lubrication on product quality during the forming process:

In traditional bending production processes, enterprises will adopt many methods to achieve better surface quality of bent pipes, including using better and superior bending machines, using high-strength molds, or using lubricating products.

. By using excellent pipe bending machines and high-strength molds, enterprises often need to invest a significant amount of funds to complete the task. Only by using pipe bending lubrication products can they achieve the quality requirements of enterprise products at a relatively low cost and at a suitable speed. However, in traditional production processes, oil-based bend pipe lubrication products can meet the quality requirements of enterprises in bend pipe production. However, the difficulty of cleaning and environmental pollution caused by oil-based bend pipe lubrication products are particularly prominent. Therefore, enterprises need to use multiple means to eliminate the impact of using oil-based bend pipe lubrication products on the final product quality, and invest a considerable amount of energy and funds in this regard. The arrival of IRMCO water-based lubricant for bend pipes not only meets the quality requirements of enterprises for bend pipe products, but also avoids and reduces the increased investment of enterprises due to the use of oil-based bend pipe lubrication products, and optimizes the production process of enterprises. In the traditional application process of oil-based lubrication products, the production efficiency of enterprises is greatly restricted due to the fluidity and extremely difficult cleaning of oil-based lubrication products, Moreover, it causes pollution to the production environment and working conditions of workers, and enterprises often need to spend a lot of money and manpower to remove these pollutants. By adopting the characteristics of being able to reduce or even avoid the human and material resources required for cleaning up pollution, as well as being able to weld directly without washing, the production efficiency and product quality of the enterprise can be greatly improved. The amount of IRMCO water-based bending grease can usually be reduced by 50% -80% compared to traditional lubricants, which can save enterprises a lot of costs