When the stainless steel pipes need to change direction during the layout of the tooling, stainless steel elbows should be used for connection, with an Angle of45o,90oWait.

　　The commonly used method for the forming production of stainless steel elbows is the push-bending forming process.

　　Push bending is a commonly used method for bending stainless steel pipe fittings, mainly used for bending elbows. According to the characteristics of the process, it can be divided into cold push bending and mandrel hot push bending.

　　1Cold push bending

　　The process method of pushing and bending the tube blank on a common hydraulic press or crank press by using a bending device is to press the stainless steel straight tube blank into a mold with a bending cavity at room temperature, thereby forming a stainless steel elbow.

　　Cold-pressed bent pipes are suitable for stainless steel elbows with a relatively small bending radius, and their minimum relative bending radiusr/d≈1.3The ellipticity of the elbow section is small(≤3%-5%)The outer pipe wall becomes thinner and smaller(≤9%)All can be bent; The elbow pushing and bending device has a simple structure, does not require special equipment, and has a high productivity. However, the relative thickness of stainless steel pipes is generally requiredt/d≥0.06Otherwise, the tube blank often loses stability due to poor rigidity, resulting in wrinkling or twisting on the inner side of the elbow.

　　2Hot-push bending of the mandrel

Mandle-type hot push bent pipes are produced on a dedicated pushing machine. Under axial thrust, they pass through a horn-shaped mandle-shaped material, which is heated and pushed simultaneously. This causes the pipe blank to undergo circumferential expansion and axial bending deformation, thereby pushing a smaller-diameter pipe blank into a larger-diameter elbow.

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