The cutting tests were carried out on HT200, HT250 and HT300 cast iron. The effects of the strength, hardness, microstructure, chemical composition of cast iron on chip shape were studied. The results show the relationship of different strength, chip thickness and chip deformation of gray cast iron, in the similar cutting conditions.

Based on the theory of adiabatic shearing, the forming process of a serrated chip during cutting Ti-6Al-4V titanium alloy was analyzed by comparing the results of the finite element (FE) calculations with the cutting experiments. The results show that the equivalent stress, equivalent strain and equivalent strain rate within a ribbon chip varied a little, but they varied a lot within a serrated chip. Moreover, the effect of cutting speed on equivalent strain rate is greater than on the equivalent stress and equivalent strain within a serrated chip. It can also be found from the results that there are small gaps between the simulation results and experimental results for the chip thickness and sawtooth height, while there is a big gap for saw-tooth pitch. This means that the simulation model has its limitations for accurate simulation of micro-geometric shape of a chip during cutting the Ti-6Al-4V titanium alloy, and further research remains to be done.

This paper proposed a design of the office chair with multi fitness function (multi-functional office chair for short) which can mainly achieved comfortably office; adjust the reline angle, doing fitness activities, such as stretched movement, kicking motion, sit-ups and so on. It not only satisfies the needs of people's daily work, rest and fitness exercise, but also meets the design requirements of ergonomics.