1, thermoforming

The hot bending process is a special bending propeller, mandrel and heating device. Under the push of the push rod, the blank sleeve moves forward on the die, and is heated, amplified and bent during the heating process.

2. Impact products

Before stamping, put the tube blank on the lower die, put the inner core and the end die into the tube blank, and the upper die starts to press down to form an elbow under the support and constraint of the outer die and the inner die. Compared with hot push forming, the appearance quality of stamping forming is not as good as that of hot push forming.

3, plate welding

The middle plate is pressed in half by a press, and then the two parts are welded together. This process is generally used for elbows above DN700.

Extended data

Elbow technical requirements

The radius of curvature needs to be controlled. For example, if the radius length is 1.5D, the radius of curvature must be within the required tolerance. Because most of these pipe fittings are used for welding, in order to improve the welding quality, the ends are all grooves with certain angles and edges. This requirement is also strict, for example, the thickness, angle, deviation range and geometric size of the edge are much more than those of the pipe fittings.

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