The process of tube drawing is similar to wire drawing. Generally draw benches are used to obtain straight tubes as shown in Fig. 9.6. The purpose of tube drawing can be any one of the following: (i) To regulate the outer diameter only. (ii) To regulate the outer diameter and to have good surface finish on the inner diameter. The [...]
We first analyze for drawing stress for tube drawing through conical portion of die by slab method. The shear deformation at entry and exit is treated separately below. Generally during drawing, both the mean diameter of tube and its thickness change. But variations in both of these cannot be taken simultaneously in the slab method. So in the following analysis [...]
In tube sinking the change in tube thickness is rather small compared to the change in diameter of tube. Therefore, in this analysis we neglect the change in tube thickness. Figure 9.20 shows the different stresses acting on a slab of thickness dx located at x from the end of conical portion of the tube. The mean radius of tube [...]