FTA analysis of the failure in the horizontal fluidity test

Peter Blaško,Jozef Petrík

doi:10.30544/69

Abstract

The purpose of the paper was to evaluate the probability of the top event in the fluidity test by Fault Tree Analysis (FTA). One of the important tests used in the foundry practice is the test of the fluidity. Fluidity is the ability of the molten metal to fill the cavity of the molds and create a cast. The AlSi10MgMn (EN 1706) alloy with 5 or 10.54 % of silica was the experimental material. The melted alloy was cast into "horizontal" three-channel mold to test its fluidity. The pouring temperatures were between 605 and 830 °C. In some cases, the experiment was not successful, for a some reasons. This fact led to a waste of time, energy, potential risk of accident, confusion among participants, especially "beginners" founders and became an impulse for the analysis of creation and possible events of fault for the fluidity test using the FTA. It has been found that for the probability of the top event in examined process was disproportionately high (0.29824). The Monte Carlo method was used for the simulation of the effect of decreasing the probability of basic events on the probability of the top event – the fault of the fluidity test.

Highlights

The measurement is a process of experimentally obtaining one or more quantity values that can reasonably be attributed to a quantity [1]
Methods for managing the measurement system are based on regular monitoring and analysis of measured data [2]
The experiment was not successful, for some reasons. This fact led to a waste of time, energy, a potential risk of accident, and confusion among participants, especially "beginners" founders. This fact became an impulse for the analysis of the creation and possible events of fault for the fluidity test using the Fault Tree Analysis (FTA)

Summary

Introduction

The measurement is a process of experimentally obtaining one or more quantity values that can reasonably be attributed to a quantity [1]. People found that metal, which is melted and poured into the cavity, obtains the shape of the cavity (the product) [3].The production of casting with a particular quality highly depends on values of casting properties of the alloys and casting metals Casting properties are those properties that ensure the possibility to create the mold with required mechanical and other operating properties by the simplest and the cheapest technological steps [4]. A thin, long casting is poured in the form of a spiral or a rod, the length of the spiral serving as a measure of fluidity Both metal and mold characteristics are involved in determining the fluidity. Mold properties (thermal conductivity, density, coefficient of friction of melted metal or the walls of the mold)

The shape of solidified casting

Findings

Code Probability Code Probability Code Probability