Papers by Keyword: Chip Removal

Abstract: Main aim of our recent research activity is the theoretical and experimental investigation of hard turning of AISI H13 (52 HRC) hot work tool steel. Chip removal processes are of essential importance in modern manufacturing technology. The demand for higher accuracy, better surface roughness, more economical production, and miniaturization are constantly growing. This determines continuous research and development of cutting processes under special circumstances. Numerical simulation plays an important role in evaluating of the cutting processes, and in prediction of forces, chip formation, distribution of strain, strain rate, stresses, and temperature. Cutting experiments with varying feed rate and cutting speed were carried out to determine their effect on surface components of resultant force. 3D finite element model was proposed to simulate the chip removal process during turning of workpiece material AISI H13 (52 HRC). This paper gives a summary about the comparison of theoretical and experimental results. It was found that boundary conditions, such as finite element size, mesh density, material separation method has significant influence on chip morphology and value of cutting force, too.

Abstract: Whether selection of chip removal air volume is reasonable or not, do affect the performance of blasthole drill and bit’s life. How to calculate air volume always make the designers confused. In this paper, writer use theory of gas-solid two-phase flow and energy principle combined with characteristic of rock ballasts from the mine site to determine particle rising speed, free floating speed and air flow rate of the rock ballasts. And according to the relation between particle and particle group’s floating speed calculate floating speed and the corresponding chip removal air volume among different diameter of particle of the same minerals. It can provide a method of calculation to designer, which is very reference value to for the practical application.