Modeling and Analysis of the Reliability of Machining Process of Diesel Engine Blocks Based on PFMECA

Abstract

Due to its difficulty in maintenance, the diesel engine have special requirements on process reliability of the engine block, which is one of the most important and hard-to-machining components of the engine, and will directly affects the performance and service life of the engine. With continuous improvements to the engine quality, the process reliability of the engine block have become more and more important. However, the previous researches mainly focus on the reliability of products, machine tools, or cutting tools, while the researches on the reliability of machining process, which lead to unstable quality of the machined engine block, have been little discussed. Therefore, this paper proposes an integrated method to analyze the process reliability of DEB (Diesel Engine Blocks). First, the reliability model of the DEB machining process is established by using reliability block diagram method. The model is mainly concerned with the process reliability and error-free judgment probability of the key features of DEB, which is deduced by using the PFMECA (Process Failure Mode, Effects and Criticality Analysis) method. Then, the response surface and FEM method is used to establish a mathematical model for the key features and its key influencing factors, and the process reliability of the key features is evaluated by Monte Carlo simulation. The reliability of the machining process is evaluated by substituting the process reliability of the key features into the reliability model of the DEB machining process. The method is applied to evaluate the reliability of the machining process of a certain type of DEB and solves the problem that the actual machining data are insufficient for reliability evaluation.

Reliability optimization of process parameters for marine diesel engine block hole system machining using improved PSO

“…Compared with Reference 15 , which only evaluates the process reliability of diesel engine block, this paper not only expounds on the evaluation of process reliability of diesel engine block, but also obtains the optimal combination of process parameters that meet the requirements of process reliability through optimization algorithm, which can guide the production of diesel engine block more effectively. However, the process of the diesel engine block is complex, so the study in this paper only focuses on the process parameters of the process.…”

Machining-Reliability-based Optimization of Process Parameters for Marine Diesel Engine Block Hole System Using HJ-PSO

“…There are many types of research on the optimization of process parameters, but few people pay attention to the influence of the uncertainty fluctuation of process parameters on the processing quality. Tian [15] provides a method to establish and evaluate the process reliability model of the diesel engine block, but this method can't control the process reliability of the block from the process design itself. Therefore, based on his research, this paper integrates the reliability theory in the process of optimization, and the reliability stability region of the block is selected based on the Monte Carlo method.…”