Izrada alata za školjkasti lijev

Ivković, Josip (2014) Izrada alata za školjkasti lijev. = Tool production for shell-mold casting. Master's thesis (Bologna) , Sveučilište u Zagrebu, Fakultet strojarstva i brodogradnje, UNSPECIFIED. Mentor: Bauer, Branko.

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Abstract (Croatian)

Rad se sastoji od dva dijela: teorijskog i eksperimentalnog. Svojstva i primjena školjkastog lijeva opisani su u teorijskom dijelu. Detaljnije su opisani dijelovi oko izrade alata i izrade školjki. TakoĎer su prikazani načini grijanja alata i izrade školjke te utjecaj na oblik školjke i moguće greške. Legura AlSi koja se koristila pri lijevanju u eksperimentalnom dijelu rada ukratko je opisana uz pregled mehaničkih svojstava. Eksperimentalni dio rada opisuje konstrukciju i izradu alata za školjkasti lijev, izdradu školjke te lijevanje kako bi se dobio odljevak, epruveta. Nacrtan je CAD model odljevka te je izvršena simulacija u QuikCAST softveru, a na temelju rezultata simulacije izraĎen je alat. Ispitani su parametri utjecaja vremena pečenja i temperature alata na debljinu stijenke i dimenzijsku točnost školjke. Odljevci su rentgenski snimljeni i napravljen je statički vlačni pokus. Dobiveni su odljevci bez poroznosti, ali je u dvije epruvete uočen uključak pijeska koji je uzrokovao pad vlačne čvrstoće ispod vrijednosti propisane normom.

Abstract

This work contains of two part: theoretical and experimental. Properties and application od shell moulding process are described in theoretical part. Construction of pattern and shell is described in detail. Methods of pattern heating, making of shells and impact on the shape of the shell are also decsribed. Aluminium alloy AlSi which was cast in the experimental part is briefly described and an overview of the mechanical properties is presented. The design and construction of pattern for shell moulding, making of shells and casting of specimen for tensile testing was done in experimental part. CAD model of pattern was used for filling and solidification simulation in QuikCAST software. Pattern for shell mould was made based on the results of simultaion. Influence of baking time and pattern temperature on shell thickness and dimensional accuray was examined. Radiography was used for testing of internal defects in castings followed by tensile testing. Castings without porosity were obtained. In two tensile specimens, inclusion of sand was observed that caused the decrease of the tensile strength below the value prescribed by the standard.

Item Type:	Thesis (Master's thesis (Bologna))
Uncontrolled Keywords:	školjkasti lijev; konstruiranje alata; školjkasti kalup
Keywords (Croatian):	shell casting; pattern contruction; shell mould
Subjects:	TECHNICAL SCIENCE > Mechanical Engineering
Divisions:	1200 Department of Technology > 1210 Foundry Chair
Date Deposited:	27 Nov 2014 14:56
Last Modified:	23 Apr 2020 10:49
URI:	http://repozitorij.fsb.hr/id/eprint/2990

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