Gear Pumps For Multi-target Tolerance Optimization Design In Life Cycle

Tolerance is Size parameters of the components of the product scope change, is the embodiment of mechanical precision, is an important index of mechanical product design and manufacturing. Tolerance affecting product quality and processing costs and thus to affect their competitiveness. Taking gear pump as an example, in the whole life cycle, combined with the manufacturing tolerances and related data, performance, cost and other service stage, binding kinetics, tribology research stage gear pump decay mechanism in service quality and uncertainty, to discuss the distribution of its components fail, the key components of its characteristics of tolerance design study conducted to establish order processing costs, loss of quality, output flow for the objective function tolerance multi-objective optimization model. The specific research work are as follows:(1)This paper introduced the development of gear pump, make a brief summary in china and abroad of the field of tolerance optimization design; This article gives the main contents of the chapter arrangement.(2) Important measure of performance is the gear pump efficiency, Gear pump efficiency is further divided into two types of mechanical efficiency and volumetric efficiency, respectively, describe the two types of efficiency; Establish gear pump output flow mathematical model to analyze the impact of the change gear mechanism for critical dimension tolerance output flow.(3)Axial clearance gear pump has a greater impact on its output flow, Introduce an idea concept of optimal gap, defining a new function between the new assembly space and optimal space, Considering the output gap is taking the gear pump flow and changes in these two factors, to establish the tolerance optimization model.;build a gear pump output flow experimental data acquisition system, from the experimental device and data acquisition device component, in order to verify the correctness of the model experiments were carried out to test the results of comparative analysis and simulation results; using a modified method to estimated service life of the gear pump.(4) To introduce a new concept of quality loss: product into service after scrap caused by the product quality characteristics within the prescribed scope, the losses caused by the present value based on the quality, the application principle of cash discount based on the distribution of the service life of the product quality loss model is set up, and put forward based on the requirement of the quality characteristics of tolerance of the product service life distribution density function calculation method, based on the distribution of the service life of the product quality loss model and the comparison between traditional taguchi quality loss model analysis; Using product service life distribution density function for the average life expectancy, will take the life and the life of the fixed components method comparison analysis; To the ring gear pump assembly dimension chain components tolerance for variables, considering its service time, performance, manufacturing cost, quality loss multi-object tolerance optimization model is set up, using genetic algorithm to solve it, will the results and considering the optimal clearance and product performance of two factors in the model results were analyzed.