Papers by Keyword: Thin-Wall Tube

Abstract: The correct choice of a metal separation method, in particular for thin-walled tubes, is vital for technical and economical performance indices in aircraft building. The most important selection criteria are separation quality, the amount of waste, possibility to consolidate operations and equipment efficiency. These factors require ongoing development & enhancement of tube separation methods. Waste-free technological processes like torsion tube sectioning are preferred. As the result of the extended research of tube separation process using torsion with active counterpressure, particularly the effect of structural parameters on cut quality, optimum tolerance for clearance fit between dies was defined. Compliance with recommended practices during equipment manufacturing will let cut quality reach the value peculiar to the quality value of sectioning method of separation using metal-cutting equipment. Herewith manufacturing becomes waste-free and quarantines calibration of sections adjacent to the cut.

Abstract: Laser tube bending is a spring-back-free noncontact forming method that has received considerable attention in recent years. Compared to mechanical bending, no hard tooling, dies, or external force is used in laser bending, thus the cost is greatly reduced for small-batch production and prototyping. Some quality issues, such as cross sectional distortion and intrados protrusion exist in laser bending and have growing tendency when the tube’s wall being thinner. This paper investigates the effects of process parameters on the deformation of thin wall tube through numerical simulations and experiments. The dimensions of the tube analyzed are 32 mm in outer diameter and 0.48mm in wall thickness. A three-dimensional transient thermo-mechanical analysis using the finite element method is carried out to simulate the laser bending process with some results validated by experiments. The effects of process parameters on the deformation of thin wall tubes are discussed in detail.

Abstract: Colloidal injection moulding of ceramics (CIMC), an innovative technique combining the advantages of conventional injection moulding and colloidal forming process, is applied to prepare thin-wall rutile tube for high capacity ozone generator. The forming process is studied detailed and the processing parameter of forming, drying and sintering schedule is determined in this research. The wall thickness of the sintered tube is 1.5~2mm and its inner diameter is about 26 mm, length is about 300 mm. The electric properties of the tube are also measured under different conditions. The above-mentioned tube is applied in ozone generator and the yield of ozone is about 55mg·L-1.