Method for conducting multi-pass flaring forming on plate type heat exchanger bushing ring

Abstract

The invention discloses a method for conducting multi-pass flaring forming on a plate type heat exchanger bushing ring. The method comprises the steps that firstly a pipe blank is assembled to the interior of an inner hole of a plate type heat exchanger pressing plate, and the pipe blank is supported onto a lower die; then the flaring pass is determined according to the thickness of the pipe blankand the length of a free end; a flaring die moves downwards in the axial direction in the multi-pass flaring process, after the flaring die makes contact with the free end of the pipe blank, the freeend is flared open, and after flaring is conducted, the angle of the free end of the pipe blank meets the requirements of the multi-pass flaring angles; the flaring die is replaced by a flattening die, the flattening die moves downwards in the axial direction, and after the flattening die makes contact with the free end of the pipe blank, the flattening die begins to flatten the free end till theangle of the free end becomes 90 degrees; and finally the flattening die exits, machining of a plate type heat exchanger bushing ring flange edge is completed, and the plate type heat exchanger pressing plate provided with the bushing ring is obtained. According to the method, forming of the plate type heat exchanger bushing ring flange edge is achieved by adopting a multi-pass flaring forming mode, cracking of the flange edge in the machining process is prevented, the die structure is simple, the machining process of the plate type heat exchanger bushing ring is effectively simplified, and the machining efficiency and the forming quality are improved.

Description

technical field [0001] The invention belongs to the field of advanced forming technology, and in particular relates to a method for forming a lining ring of a plate heat exchanger by multi-pass flaring. Background technique [0002] The plate heat exchanger is a high-efficiency heat exchanger formed by stacking a series of metal sheets with a certain corrugated shape. The lining ring of the plate heat exchanger is an important part of the plate heat exchanger. During the service period, the heat exchanger plates need to be cleaned regularly, but the lining ring cannot be disassembled and it is difficult to clean. The metal lining rings for the inlet and outlet of cold and hot fluid / gas are expected to serve the entire life cycle of the heat exchanger. [0003] However, at present, the lining ring of the plate heat exchanger is mostly manufactured by the method of tailor-welding flange edges at both ends, or the flange at one end of the lining ring is processed by stamping an...

AI Technical Summary

Problems solved by technology

The weld on the flange side of the metal lining ring does not affect the appearance of the product, especially during service, it is prone to corrosion, which affects the service life of the heat exchanger and increases the difficulty of maintenance of the heat exchanger

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