| Type analysis of elbow machine
Bend machine mainly include alloy core head, intermediate frequency coil bracket, intermediate frequency coil, export support, push the door, open hydraulic oil cylinder, push board, after the gate, the hydraulic lift cylinder, the main oil cylinder, cylinder bracket, after feeding the core rod, the big chassis, oil cylinder bracket, motor, axial plunger pump, integrated block (which installation of the hydraulic control valve), etc. Aoguang Machinery Equipment Co., Ltd. export elbow machine in Malaysia, India, the United States, Iran, Russia, Turkmenistan and other places to the satisfaction of users.
The elbow produced by the push elbow machine is the elbow made by the mandrel extrusion bending method. The push mechanism is as follows: A set of determining the length of the pipe, in turn, wear on the core shaft, start-up speed regulating motor, through the gear drive screw, to push plate along the screw forward movement, push board will be set on the core shaft tube rounds into the core shaft front horn-type mandrel, at the same time, medium frequency induction coil, sensors for billet heating, tube billet in the process of heated while moving forward, from the horn mandrel extrusion, Due to the action of pushing force and friction resistance, the tube blank is extruded to produce the combined deformation of radial expansion and axial bending, so that the small diameter tube blank is pushed into the larger diameter elbow.
Medium frequency heating elbow mechanism is used to make the elbow. In the forming process, the metal flow law is as follows: the inside metal of the elbow flows to both sides, the outside metal does not participate in the deformation, only part of the metal is redistributed.
1. Bend machine series hot pushing elbow outer arc tensile plastic deformation is larger, the normal temperature, high temperature yield strength and tensile strength increases, plasticity and significantly lower back and toughness, so should make more reasonable production process, strict control of bend hole enlargement ratio, reducing elbow outer arc tensile plastic deformation, in order to obtain excellent comprehensive mechanical properties.
2. The inner arc wall thickness of the thermal thrust elbow pushed by the elbow machine should not be thickened, and the inner arc is just the high stress area of the elbow. In order to ensure that the inner arc wall thickness of the elbow meets the standard requirements of the product, tube billet with appropriate wall thickness should be selected for pushing.
3. The hot push elbow can produce axial bending deformation and radial expansion in the forming process, so special attention should be paid to check whether there are cracks, microcracks and intergranular cracks in the inner and outer walls of the elbow.
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