Detachable electromagnetic induction heater for diameter-expanded bend-pushed large-diameter elbow

Abstract

The invention discloses a detachable electromagnetic induction heater for diameter-expanded bend-pushed large-diameter elbow, which comprises a detachable electromagnetic induction heating coil, wherein a molding core head for expanding diameter and pushing bend is sleeved with the detachable electromagnetic induction heating coil; a central axis of the detachable electromagnetic induction heating coil is coincident with a central axis of the molding core head; the molding core head is a cleat-shaped core head that comprises an extension section, a deformation section and a shaped section; the detachable electromagnetic induction heating coil comprises a straight line section heating coil and a bended section heating coil; the straight line section heating coil and the bended section heating coil are connected by copper bars; the straight line section heating coil is annularly wound on the extension section; and the bended section heating coil is annularly wound on the deformation section and the shaped section. The detachable electromagnetic induction heater is simple in structure, reasonable in design, simple and convenient to use and operate, strong in operability, good in using effect, not only can improve the pipe blank feeding efficiency when expanding the diameter and pushing the bend of the large-diameter elbow, and also can improve the heating efficiency and the uniformity of the pipe blank.

Description

technical field [0001] The invention belongs to the technical field of manufacturing metal pipe fittings, in particular to a detachable electromagnetic induction heater for expanding and pushing large-diameter elbows. Background technique [0002] In the process of expanding the diameter and pushing the elbow, the heating of the tube blank adopts the medium frequency electromagnetic induction heating method, and the electromagnetic induction coil generally surrounds the croissant core. The design of the electromagnetic induction coil is not only related to the diameter, wall thickness, relative bending radius, material and deformation temperature of the processed elbow, but also related to the magnetic permeability, thermal melting and thermal conductivity of the material. Among them, the number of coil turns of the medium frequency induction heater is not only related to the temperature required for the tube blank during push bending, but also related to the magnetic permea...

AI Technical Summary

Problems solved by technology

[0006] Therefore, the induction heating coil of paramagnetic material is a multi-turn induction coil that follows the shape of the croissant core. The coil has a large bending degree, and the coil in the bent section will touch the core rod, and the tube blank cannot be loaded into it.

If the position of the coil in the bending section is increased during design, the problem of charging the tube billet can be solved, but it will inevitably affect the heating uniformity of the tube billet. The pushing speed of the elbow, the diameter expansion and bending deformation of the front end of the elbow are hindered, the temperature at the rear end is high, and the diameter expansion and bending speed is fast, which not only affects the pushing and shaping of the elbow, but even causes wrinkles and accumulation of the tube blank , resulting in the failure of elbow expansion and push bending

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