Effect of Annealing Treatment on Die Filling Rate of Mini Gear in Squeezing Forming Process

Abstract

The aim of this research is to investigate the effect of annealing treatment on mechanical properties and deformability of titanium alloy to form mini gear in squeezing process. Diameter of experimental specimen was 5mm of Grade 2 Ti alloy. It was annealed with temperature in a range of 500 to 1000 °C, resulting in different initial grain sizes. The mechanical properties and hardness of annealed specimens were obtained by means of tensile and micro-hardness test. In addition, a modulus of mini gear die was 0.92 and made of h13 steel. The annealed specimens were inserted in die and squeezed into mini gear. The experimental results show that microstructure of α-phase precipitates when annealing temperature reaches to 600 °C and hold time was 3 hours. The specimen which annealed with a temperature of 700 °C has the maximal elongation and die filling rate. The microstructural of β-phase precipitates when annealing temperature reaches to 1000 °C resulting in brittle behavior and the lowest die-filling rate.