The push bending method is a relatively common approach for bending stainless steel pipe fittings. It is mainly used for bending through elbows. According to the characteristics of different bending processes, it can be divided into cold push bending and mancore hot push bending.

1.Cold push bending uses different bending test devices to push and bend the tube blank in a common lifting hydraulic press or a crank press. At room temperature, the stainless steel straight tube blank is pressed into the die to form a stainless steel elbow. It is suitable for cold-rolled stainless steel elbows with a smaller bending radius, and the minimum bending radius is relatively smallerr≤d≤1. The ellipticity of the cross-section of the elbow pipe is small.≤3％≤5％The outer pipe wall gradually becomes thinner.≤9％It has a simple structure, does not require special equipment and has a high production efficiency. However, the design requirements for the relative different thicknesses of stainless steel elbows are as followst≥0.06. Otherwise, due to poor rigidity, the billet often loses stability, resulting in wrinkles or deformation of the elbow.

2.Under the action of the special axial thrust, the thermal push rod is axially central bent, and the bending deformation of the pipe being pushed axially undergoes circumferential expansion and axial direction. The small-diameter pipe is pushed into the larger-diameter elbow.

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