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Manufacturing of straight-seam elbows
Release time:
Oct 13,2020
In general, stamping of straight-seam elbows does not produce any excess chip waste, and material consumption is minimal. Moreover, no additional heating equipment is required. Therefore, this is a material-saving and energy-efficient manufacturing method, and the cost of stamped parts is also low.
In general, stamping of straight-seam elbows does not produce any excess chip waste, and material consumption is minimal. , Moreover, it does not require any additional heating equipment, making it a material-saving and energy-efficient processing method. Additionally, the cost of stamped parts is low.
During the stamping of straight-seam elbows, since the die can ensure high precision in both the dimensions and shape of the stamped parts—and typically does not compromise the surface quality of the stamped components—the die usually has a relatively long service life. Consequently, the quality of the stamped parts is stable, their interchangeability is excellent, and they exhibit identical characteristics throughout.
The medium-frequency bending process for straight-seam elbows boasts high production efficiency in stamping operations, is extremely easy to operate, and can readily be mechanized and automated. This is because its stamping process relies on dies and stamping equipment to complete the machining. Moreover, the actual number of strokes per minute for conventional presses can be set as high as several dozen, while even high-speed presses can achieve hundreds or even over a thousand strokes per minute—and each stroke can potentially yield a finished part.
The production process for high-pressure, thick-walled elbows in straight-seam bends—when it’s possible to manufacture long-radius ASME-standard elbows—begins with selecting the appropriate specification and then procuring the pipe material. It’s also necessary to calculate the expansion ratio. Based on theoretical calculations, the expansion ratio can be determined within the typical range, and then the process can be reversed to work backward from there. For short-radius elbows, the general expansion ratio is usually determined after selecting the raw materials and according to the elbow’s specific dimensions; afterward, the radius of curvature must be taken into account. Finally, by analyzing its curvature, we can calculate exactly how much material is needed to produce a bent pipe of a given length. Moreover, through theoretical calculations, we can determine this exact length in advance and then use it as a fixed dimension for cutting. You’ve probably all seen how the pushing machine operates—it’s actually quite simple to operate. Typically, the machine uses a horn-shaped mandrel or core rod, and the diameter of the core rod can be adjusted from thin to thick. At the same time, the pushing process itself essentially mimics a combination of expanding the pipe diameter and bending it simultaneously. With support provided at the rear end, the cut pipe section can be inserted onto the core rod, and a supporting frame can also be used to secure the core rod at the back end. Currently, there are many different methods for manufacturing and processing straight-seam elbows, and generally... DN600 The following elbows are all made by the push-bending process, i.e., they are push-bent elbows.
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