dTechnological Knowledge Management System for Foundry Industry

In technological process of steel industry heat transfer is a very important factor. Heat transfer plays an essential role especially in rolling and forging processes. Heat flux between a tool and work piece is a function of temperature, pressure and time. A methodology for the determination of the heat transfer at solid to solid interface has been developed. It involves physical experiment and numerical methods. The first one requires measurements of the temperature variations at specified points in the two samples brought into contact. Samples made of C45 and NC6 steels have been employed in physical experiment. One of the samples was heated to an initial temperature of: 800°C, 1000°C and 1100°C. The second sample has been kept at room temperature. The numerical part makes use of the inverse method for calculating the heat flux and at the interface. The method involves the temperature field simulation in the axially symmetrical samples. The objective function is bulled up as a dimensionless error norm between measured and computed temperatures. The variable metric method is employed in the objective function minimization. The heat transfer coefficient variation in time at the boundary surface is approximated by cubic spline functions. The influence of pressure and temperature on the heat flux has been analysed. The problem has been solved by applying the inverse procedure and finite element method for the temperature field simulations. The self-developed software has been used. The simulation results, along with their analysis, have been presented.

Section: Numerical Modelmentioning

confidence: 99%

Modelling of Heat Transfer at the Solid to Solid Interface

Rywotycki

Malinowski

Falkus

et al. 2016

“…Optimization as used herein is understood as the choice of the best solution satisfying specific quality criteria, e.g. costs, environmental impact, efficiency [10,11,12]. The optimal method for metal foam making has been identified on the basis of two major criteria and their subcriteria: "manufacturing costs", including price of the foam making equipment and labour, costs of materials, environmental impact, and "foam quality", depending on manufacturing precision, homogeneity of the structure, pore size and shape, and volumetric fraction of pores.…”

Section: Production Of Metal and Metal-composite Foamsmentioning

confidence: 99%

Two-Criteria Analysis of Casting Technologies of Metal and Composite Foams

Gawdzińska¹,

Gucma²

2015

The determination of potential areas of application for metal foams allows to precisely define properties these materials are expected to have. The characteristics of metal foams are strictly related to their cellular structure, which in turn depends on the manufacturing method and materials used. Obviously, metal foam producers should strive to make these materials using inexpensive, or cost-effective technologies, yielding possibly good quality and being environment-friendly. This paper briefly characterizes the manufacturing of metal and composite foams by casting methods. We determine an optimal manufacturing method based on a matrix diagram for metal and composite foams satisfying the two -criteria: "manufacturing costs" (depending on the price of production equipment and labour, cost of materials for foam manufacturing, environmental impact) and "foam quality" (depending on the manufacturing precision, homogeneity of the structure, pore size, shape, and volumetric fraction).Keywords: metal and composite foams, manufacturing methods, matrix chart analysis Określenie potencjalnych obszarów zastosowań pian metalowych pozwala sprecyzować wymagania dotyczące właściwości tych materiałów. Są one ściśle związane ze strukturą komórkową determinowaną metodą wytwarzania oraz zastosowanym materiałem wyjściowym. Należy dążyć do wytworzenia tych struktur metodami tanimi, dającymi najlepszą jakość wyrobu a przy tym możliwie przyjaznymi dla środowiska naturalnego. W niniejszej pracy, krótko scharakteryzowano wytwarzanie pian metalowych i kompozytowych metodami odlewniczymi. W pracy opisano jak określić optymalny sposób wytwarzania w oparciu o schemat macierzy dla pianek metalicznych i kompozytowych spełniających dwa kryteria: "koszty produkcji" (w zależności od ceny urządzeń do produkcji i pracy, kosztów materiałów do produkcji pianki, oddziaływania na środowisko) oraz "jakości piany" (w zależności od precyzji wykonania, jednorodność struktury, wielkości porów, kształt i frakcję objętościową).

“…In an age of rapidly developing technology, an important element of the design and control of the process are information systems, including decision support tools [1][2][3]. The knowledge base of such systems consist of two types of formal resource-one of them is a set of decision rules [4,5], and the second-the repository of documents containing technological knowledge necessary for decision-making in emergency situations, in the non-routine activities [6,7].…”

Section: Introductionmentioning

confidence: 99%

Formalization of Technological Knowledge in the Field of Metallurgy using Document Classification Tools Supported with Semantic Techniques

Regulski

2017

The process of knowledge formalization is an essential part of decision support systems development. Creating a technological knowledge base in the field of metallurgy encountered problems in acquisition and codifying reusable computer artifacts based on text documents. The aim of the work was to adapt the algorithms for classification of documents and to develop a method of semantic integration of a created repository. Author used artificial intelligence tools: latent semantic indexing, rough sets, association rules learning and ontologies as a tool for integration. The developed methodology allowed for the creation of semantic knowledge base on the basis of documents in natural language in the field of metallurgy.