The main reasons affecting the quality of Bend pipes

1. In pure bending, the outer arm wall of the neutral layer is thinned by tensile stress &1 under the action of the outer force distance M, and the inner side is stressed by compression. The combined forces N1 and N2 change the cross section of the tube. Based on this factor, the main reason for the quality decline of the bend is RX and SX. Therefore, in GBJ235-82, the RX value and the thinning amount of the outside under various pressure levels are clearly stipulated, in order to control the value of RX and SX, so as to ensure the quality.

2. The previous article has said that the lateral tension of the material in the bending pipe is different from the position of the neutral axis in the bending method. The neutral axis is about 1/3 away from the outer wall when the top bending type (compression bending) works, and the neutral axis is 2/3 away from the outer wall when the rotary bending type (back bending) works. Therefore, it is beneficial to use the rotary bending method for thin wall pipe bending.

3. The precision of the bending tire is also one of the factors affecting the quality of the bending pipe. When we manufacture the curved tire, in addition to the specification and size requirements to control in a certain tolerance range, but also requires users to choose the corresponding curved tire according to the bending pipe diameter when using.

4. The bendability and surface corrosion of the pipe itself may also affect the quality of the pipe bending. During site construction, the operator also needs to know the material of the pipeline being processed, the processing performance and make a judgment on the surface corrosion.

5. R is now provided. (Bending radius/pipe outer diameter) relationship curve for user's reference when choosing the relationship between pipe diameter and wall thickness. Reflect the influence of the relative bending radius and wall thickness on the quality of the bending pipe. According to the acceptance specifications for pipeline processing, for cold-formed steel pipes, the medium and low pressure is 4D, and the high pressure is 5D. Therefore, our bending tire design is R=4D(special circumstances are determined separately), so as for the bending machine produced by our factory, the relative wall thickness SX is mainly selected. The upper part of the figure is the non-mandrel area, the middle part of the figure is the common mandrel area, and the lower part of the figure is the special mandrel area. Because of the special mandrel design and manufacture are very difficult, the operation is not very convenient, so the general factory does not supply. Special circumstances may be agreed upon.

6. The influence of lubrication on product quality in the molding process:

In the traditional pipe bending production process, in order to get better surface quality of the pipe bending, enterprises will take many measures, including: the use of more advanced high-grade pipe bending machine, with higher strength mold, or the use of lubricating products and other methods. The use of high-grade pipe bender and high strength mold, enterprises often need to invest a very large amount of money to complete, only the use of elbow lubrication products is relatively cheap and fast to meet the requirements of enterprise product quality. But in the traditional production process: Oil-based bend lubrication products can satisfy the business enterprise at the request of the elbow bend pipe production quality, but the oil-based bend lubricant is not easy to clean and pollution to the environment is very prominent, so that enterprises must adopt more means to eliminate because lubrication oil-based bend products impact on the quality of the final product, putting in more effort and money. The arrival of IRMCO water-based grease for elbow can not only meet the requirements of the enterprise for the quality of elbow products, but also avoid and reduce the increased investment of the enterprise due to the use of oil-based elbow lubrication products, and completely optimize the production process of the enterprise.

In the application process of traditional oil-based lubrication products, the production efficiency of enterprises is greatly restricted, because the fluidity and extremely difficult cleaning of oil-based lubrication products, but also cause pollution to the production environment and working conditions of workers, enterprises often need to spend a lot of money and manpower and material resources to remove these pollution. The use can reduce or even avoid the human and material costs of cleaning up the pollution for the enterprise, and its characteristics of non-washing and direct welding can greatly improve the production efficiency and product quality of the enterprise. The amount of IRMCO water-based elbow grease can usually be reduced by 50%-80% compared with traditional lubricating oil, which can save more costs for enterprises.

Cangzhou Shenlong Pipe specializes in the production of steel pipe and pipe fittings, including elbow, tee, reducer, etc., the product quality is guaranteed, can arrange SGS inspection, is the first choice for some large projects.