Karakterizacija materijala kalupa za injekcijsko prešanje polimera

undergraduate thesis

• Title (english): Characterization of mold material for injection molding of polymers
• Author: Ana Antunović
• Mentor: Vera Rede (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2023-03, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

U završnom radu provedena je karakterizacija materijala u području pukotine na alatu za injekcijsko prešanje polimera. Matrica kalupa izrađena je od čelika oznake X37CrMoV5-1.
U teorijskom dijelu rada, opisan je postupak injekcijskog prešanja polimera, navedeni su materijali koji se najčešće koriste za izradu kalupa za injekcijsko prešanje polimera te opterećenja kojima je kalup izložen.
U eksperimentalnom dijelu rada provedena je analiza mikrostrukture i izmjerena je mikrotvrdoća HV0,2 na materijalu u blizini pukotine koja se pojavila na matrici kalupa, i dalje od pukotine.
Pri većim povećanjima na svjetlosnom mikroskopu, uz pukotinu su uočene manje pukotine koje se šire dublje u materijal te korozijski produkti na površini. Mikrostruktura čelika sastavljena je od martenzita i sitnih karbida koji se ne vide na svjetlosnom mikroskopu. Nije uočena razlika u mikrostrukturi uz pukotinu i dalje od pukotine.
Uz pukotinu su izmjerene više vrijednosti mikrotvrdoće, nego dalje od pukotine. Najviše vrijednosti mikrotvrdoće izmjerene su uz pukotinu, na unutarnjem rubu stijenke matrice (756 HV0,2).

Abstract (english)

In the thesis, the characterization of the material in the area of the crack on the polymer injection molding tool was performed. The mold matrix is made of X37CrMoV5-1 steel.
In the theoretical part of the work, the process of injection molding of polymers is described, the materials most often used for making molds for injection molding of polymers and the loads to which the mold is exposed are listed.
In the experimental part of the work, the analysis of microstructure was performed and the microhardness HV0.2 was measured on the material near the crack that appeared on the mold matrix and away from the crack.
At higher magnifications on the light microscope, smaller cracks that spread deeper into the material and corrosion products on the surface were observed along with the crack. The microstructure of steel is composed of martensite and small carbides that cannot be seen under a light microscope. No difference was observed in the microstructure along the crack and away from the crack.
Higher microhardness values were measured near the crack than further away from the crack. The highest microhardness values were measured next to the crack, on the inner edge of the matrix wall (756 HV0.2).

• Keywords: karakterizacija; injekcijsko prešanje; kalup; pukotina
• Keywords (english): injection molding; mold; polymers; characterization
• Language: croatian
• URN:NBN: urn:nbn:hr:235:797980
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-03-01 21:21:19