Internal surface tooth geometrical shape change measuring apparatus for rifled pipe expansion

Abstract

The invention relates to a device for measuring the geometrical change of the tooth shape of the internal surface during the deformation of an internal screw tube expanding tube in the technical field of material processing, wherein a test piece is adhered to the inside of a test piece bonding groove which is fixed on a bonding groove fixed platform; the bonding groove fixed platform is fixed on a three-phase dynamometer piezoelectric transducer platform which is fixed on a three-dimensional coordinatograph working platform and connected with a charge amplifier and an A / D acquisition computerthrough a signal line; an expanding tube die is tightly fixed on a three-dimensional coordinatograph shank and locks the rotation freedom degree of the three-dimensional coordinatograph shank; and a dial gauge is fixed on the three-dimensional coordinatograph shank through a magnet base. The device evaluates the change of geometrical parameters of the designed tooth shape after the formation of the expanding tube in the design stage, can reasonably correct the designed tooth shape by a reverse design method, reduces the error of the designed tooth shape and an actual tooth shape, and has stable measuring result and high precision.

Description

technical field [0001] The invention relates to a device in the field of metering technology, in particular to a device for measuring the geometric shape change of the tooth shape of the inner surface during the expansion of the inner threaded pipe. Background technique [0002] The inner threaded tube is the first choice for high-efficiency and energy-saving tubes used in heat exchangers. Because the inner wall has a certain height and a certain angle of spiral ribs, it not only greatly increases the contact area of ​​the inner wall, but also makes the refrigerant flow in the tube in a turbulent state. The heat exchange process is more sufficient. The test shows that the heat transfer efficiency of the inner threaded tube can be increased by 4 to 8 times compared with the traditional bare tube. In the production of ERW (Electric Resistance Welding, Electric Resistance Weld) high-frequency welded internal thread pipe, it is first necessary to emboss the strip material, and ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the prior art, to provide a device for measuring the geometric shape change of the tooth profile on the inner surface in the forming of the internally threaded pipe expander, so that it can use an advanced high-precision three-phase dynamic instrument to simulate the internally threaded pipe expander forming Process - the effect of the expansion pressure on the pipe wall, and use a dial gauge to measure the reduction and rebound of the tooth height, so as to solve the problem that the existing technology cannot effectively obtain the tooth height change after the internal thread pipe expansion is formed

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