Analysis Of Vibration Drilling Process And Mechanism

Owning to the properties of low hardness, high toughness, Aluminum alloy is easy to produce the built-up edge and the long chip is hard to break, which is strongly influence the surface roughness of work piece. For hole machining, especially deep hole and micro hole, the influence of chip is significant.As a conventional machining method, twist drill is used most widely in drilling. Due to its complex structure and the irrationality of the geometric parameters of the cutting part, it has been difficult to adapt to the modern machining requirements of high speed, high precision, automation and the widely application for hard processing material. It is necessary that there is a development for drilling.Vibration drilling is a kind of vibration cutting. As a non-traditional processing method, it has been widely recognized that vibration drilling has good process effect. It has been applied in practical production in the past few decades. In the vibration drilling condition, the process effect and mechanism on2A12are studied by using high speed steel twist in this paper. The main contents as follows:The first work make the vibration worktable meets the requirements of the test by strengthening its stiffness.A set of amplitude testing device is developed based on the principle of optical lever, and successfully applied in the experiment.The chip breaking theory of axis vibration drilling is proved in the experiment. The chip can be controlled to achieve the desired effect of the chip breaking by selecting the proper parameters. The axial force and torque are measured and analyzed to derive two empirical formulas when cutting2A12by the axial vibration drilling. These formulas indicates that the frequency affects significantly on the axial force not on the torque and the feed rate make a great impact on the above two factors.The influence on the internal surface roughness of the hole by the vibration drilling is analyzed from the theory and the experiments. The results showed that not frequency but the feed rate significantly impacts on the surface roughness.The present research results have shown good process effect of axial vibration drilling technology. However, when in practical use, for obtaining the better machining effect, it still needs mass experimental studies to seek for the further optimization of the process parameters.