الفهرس 
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Abstract
Pipes are used in many industrial applications such as carrying the fluids from one place to another. Pipes are made in standard lengths; the desired length of a pipe may be obtained by joining. There are several ways to join pipes; e.g welding, flanges, clamped joint, union joint, and nosing. The tube nosing is produced by traditional methods such as statically method by punch and dia. The tube nosing also can be produced by spinning processes. Spinning is one of the most common forming processes. That is used in tube end forming and manufacturing of axisymmetric products and has been widely used in various applications. Many types of metal working processes are used to deform tubes in industrial fields. Nosed tubes are used in pipe lines for crude oil transportation consist of a number of pipes that are joined together, and the pipe ends are either nosed or expanded in advance. The conical nosing of tubes is typically performed by axial compression until recently.
This work presents the possibility of tube nosing by spinning process using center lathe machine and specific tool to form the nose. This work is to introduce design of tool based on the required nosing ratio (NR). The theoretical analysis for nosing process was predicted and the torque to choose the required the appreciate machine. An experimental work is carried out to form aluminum as received tube nosing. Different working conditions i.e. nosing ratio (NR), 1.5, 1.6, 1.7, 1.8, 2.2 and 2.4, axial feed (f), 0.3, 0.4, 0.5 and 0.6 mm/rev, and rotating speed (N), 76, 150, 230 and 305 rpm are considered. The nosing process is carried out for several specimens with variation of the working conditions. The parameters were study is carried out to demonstrate the influence of the working conditions on the wall-thickness variation, vicker hardness, and forming load.
The results showed that the tube nosing process carried out by nosing tool was safe until limiting nosing ratio 2.2 while previous work was 1.4 nosing ratio. Increasing the nosing ratio casus a relatively increase in the forming loads and increasing in final thickness of the deformed tube end at all working conditions of axial feed and rotational speed. The micro hardness of tube surface increased with increasing of rotational speeds (N) rpm or nosing ratio. The error between the theoretical and experimental results found to be within 20%.