Reliability Research On High Speed Tool Holder/Spindle

As one of the four advanced manufacturing technologies, high speed machining technology is the most valuable and widely used in advanced manufacturing industry. It greatly promote the development of aerospace industry, automobile manufacturing industry and military industry. The reliability of the high-speed tool holder/spindle directly determine the machining precision and the surface quality, the life of the high speed machine tool and its tool system, the cost and safety of machining. That how to scientifically evaluate the reliability of the high speed tool holder/spindle has important theoretical significance and practical value to make a good performance and to guarantee the safety in high speed machining.This paper studies the reliability of high speed tool holder/spindle by using the methods of theoretical analysis and finite element numerical simulation. This dissertation consists of six chapters: the first chapter is the introduction, the second chapter is characteristics of high speed tool holder/spindle and basic reliability theory, the third chapter is modeling high speed tool holder/spindle, the fourth chapter is simulation and reliability analysis of high speed tool holder/spindle, the fifth chapter is reliability evaluation of high speed tool holder/spindle, the sixth chapter is the conclusion and prospect. The main work and results of this study are:(1)The reliability model of high speed tool holder/spindle interface, torque transmission, vertical section location and fatigue were established based on stress-strength reliability analysis with the mechanical model of HSK tool holder/spindle which was established by elastic-plastic mechanics theory. And the formula of high speed tool holder/spindle was given by the method of the probability density function. The research can provide the theoretical basis for enhancing the reliability of high speed tool holder/spindle in the phase of initial design. Some results of the research have been written in precision tool technology innovation strategic alliance standard: Reliability Evaluation Method of Spindle/Tool Holder(GLB/T0013-2015).(2) Based on the Monte Carlo theory, the reliability of high speed tool holder/spindle interface, torque transmission, vertical section location and fatigue strength were studied by finite element method. The influence of these three factors: magnitude of interference, clamping force and rotational speed was revealed. The results of the reliability studies of the high-speed tool holder/spindle can provide technical support.(3) Based on fuzzy mathematics theory, the necessity of establishing fuzzy reliability model of high speed tool holder/spindle was given. The relevant formulas are given by using the semi trapezoid and trapezoidal function. The methods and results can give a new way for scientifically evaluating the reliability of high speed tool holder/spindle.(4) The concept of inherent reliability and field reliability is introduced, and the relevant formula was given. The inherent reliability and field reliability of high speed tool holder/spindle under different working conditions is calculated by example calculation. And it came to conclusion: the field reliability is lower than the inherent reliability, which requires us to reduce the influence of the use of high speed tool holder in daily time. The research results provide some certain reference value to scientifically guide the actual production process and to improve the reliability of high speed tool holder.