The manufacturing method of stamping elbow can produce 90 of West 18–630 mill. The advantage of the elbow and pressing method is that the equipment is simple, and it can produce thin-walled elbows, such as elbows with a wall thickness of 1.5 mm or more. The diameter of the blank and the finished product are the same, and the thickness of the finished product can also be uniform. Some expanded diameters Thin-walled elbows that cannot be produced by the method can be manufactured by this method. The pressing die of the pressing method is a bit similar to the shaping die of the expanding push method, but the core structure of the pressing method is very complicated and difficult to manufacture, and the pressing method 1800 elbows cannot be produced. Therefore, this method has advantages and disadvantages compared with the expanding method.
The blank section of the pressing method is trapezoidal. The blank is evenly heated to 300°C and placed in the mold cavity. The core and support pins are inserted into the tube in three directions: front, back, left and right, and corners, and then the upper mold is pressurized to complete the forming work. The upper mold is lifted After that, take out the support pin and the core head, and the forming process is completed.
Compared with the installation of ordinary copper stamping elbows, the assembly and installation of stamping elbows has strict process requirements and high quality requirements. Therefore, before welding, welders have been trained in welding technology and obtained welding certificates of corresponding projects before they can hold the certificates; pipe installers have also been trained in the installation process of large-diameter stainless steel pipes, understand the process characteristics, and are proficient in operating procedures and specifications. Available