A pulse current assisted internal thread copper tube forming device

Abstract

The invention discloses a pulse current auxiliary inner grooved copper tube forming device, which comprises a power, a tube blank contact device and a formed tube contact device. The tube blank contact device comprises a bottom plate, an insulating plate, support frames, rolling bodies, wherein two rolling bodies in up and down arrangement form a group and are fixed between the two support frames; a formed tube contact device comprises a tightening spring, a sleeve and a graphite block; the tube blank contact device and a copper tube before reducing processing are in rolling contact; a positive electrode of the power supply is connected with the tube blank contact device; the formed tube contact device contacts with the copper tube after spinning of internal thread and sizing process; and the negative electrode of the power supply is connected with the formed tube contact device. During operation, the power supply continuously outputs pulse current to form a closed loop with the tube blank contact device, the copper tube and the formed tube contact device. The invention uses the electro plastic effect of metal in the inner grooved copper tube machining process to improve the elongation of the copper tube, so that the metal has good fluidity in spinning forming to obtain an ideal tooth shape; and the device reduces deformation resistance, is easy for drawing, and omits an annealing process.

Description

technical field [0001] The invention relates to the technical field of extrusion forming, in particular to a pulse current assisted internal thread copper tube forming device. Background technique [0002] TP2 copper tubes are widely used in heat exchangers, fuel systems, air restrictors, especially for air-conditioning manufacturing because of their good thermal conductivity, corrosion resistance and excellent processability; currently with the development of the air-conditioning and refrigeration industry With the continuous growth of demand, the quality requirements for air conditioners are constantly improving. Internally threaded copper tubes with high-efficiency heat transfer characteristics are gradually replacing traditional smooth copper tubes and becoming special conduction tubes for high-performance air conditioners. However, before the copper pipes for air conditioners are processed into internally threaded copper pipes, they need to go through processes such as ...

AI Technical Summary

Problems solved by technology

However, before the copper pipes for air conditioners are processed into internally threaded copper pipes, they need to go through processes such as double drawing, several diameter reduction coils, and internal thread forming. The copper pipe itself often undergoes work hardening, and the internal stress increases, which is not conducive to drawing. , Internal thread forming process, get bad tooth shape and produce various defects, affecting product quality

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