An Experimental Study for the Development of Mandrel-Free Hot-Spinning for Large Size Titanium Alloy Plate Forming

Abstract

A mandrel-free hot-spinning was developed as a near-net-shape titanium alloy plate forming technique. In this work, a Ti-6Al-4V alloy conical product with a wall angle of 34 degrees and 170mm height was formed from a large size Ti-6Al-4V plate (890∼920mm dia. × 30mm thick). The product was characterized metallurgically and mechanical properties were measured, and the shape of formed products was investigated. It was found that the mandrel-free hot-spinning is able to form a large size titanium alloy plate. Material properties including tensile strength and microstructure of the formed products satisfied the material specifications. Fatigue stress of the formed product was higher than that of the typical Ti-6Al-4V material. For a further improvement, a forming method using pre-formed material was proposed and which was successfully conducted with two types of preforms and found to be effective in the forming process.

A Manufacturing Driven Design Methodology to Lightweighting of the Structural Elements of a Permanent Magnet Electrical Machine Rotor

“…For the selection of materials stated above, the feasibility of utilising these with various manufacturing methods has been considered. Titanium is applicable to a wide range of processes, including forging [24], casting [25], radial forging [24], and spinning [26]. Steels alloys are applicable to most manufacturing processes, although the yield strength obtained can greatly vary from 1420 MPa for a forged component [27] to 210 MPa for an extruded component [28].…”