Vpliv temperature orodja na kakovost površine tankostenske PTFE cevi

Pustoslemšek, Urška (author), Kosec, Borut (mentor)

Za zmanjševanje premera tankostenske PTFE (teflonske) cevi, se je do danes uporabljalo orodje izdelano iz aluminijeve zlitine EN-2030. To orodje smo nadomestili z orodjem izdelanim iz nerjavnega jekla 1.4571. Naloga orodja je zmanjšanje premera cevi na ustrezen končni premer. Pri zmanjševanju premera tankostenske PTFE cevi, je izredno pomemben dejavnik temperatura orodja, zato mora biti le ta ustrezna, da zagotovimo ustrezno kakovost površine tankostenske PTFE cevi. V diplomskem delu smo pokazali, kakšen vpliv ima temperatura orodja na površino tankostenske PTFE cevi. Zanimalo nas je predvsem segrevanje orodja in kako orodje z nehomogeno temperaturo vpliva na kakovost površine cevi. Ugotovili smo, da pri starem orodju, ki je izdelano iz aluminijeve zlitine EN-2030, pride do neenakomernega segrevanja, kar posledično vpliva na kakovost površine cevi. Zaradi težav in krčenja starega orodja, smo se odločili za izdelavo novega orodja iz nerjavnega jekla 1.4571, ki ga vstavljamo v grelni podstavek iz aluminijeve zlitine EN-2030. Novo orodje se segreva enakomerno in zato se tudi cev v orodju segreva enakomerno, ter tako zagotovimo ustrezno kakovostno površino cevi. Z novim orodjem se v enakem časovnem intervalu izdela več cevi z ustreznejšo in kakovostnejšo površino. Proces segrevanja orodij smo kontrolirali z uporabo termovizijske kamere Fluke Ti400. Tako smo še dodatno potrdili, da se staro orodje segreva neenakomerno. Ugotovili smo tudi da je temperatura novega orodja homogena in ustrezna po celotni površini orodja. Površine cevi pa smo si ogledali tudi pod optičnim in vrstičnim elektronskim mikroskopom.

• Language: Slovenian
• Keywords: Tankostenska PTFE cev, orodje, temperatura, segrevanje, kakovost površine.
• Work type: High school thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Year: 2020
• PID: 20.500.12556/RUL-120960
• COBISS.SI-ID: 34575363
• Publication date in RUL: 28.09.2020

Secondary language

• Language: English
• Title: Influence of tool temperature on the thin-walled PTFE pipe surface quality

Abstract

To reduce the diameter of a PTFE (Teflon) thin wall pipe, a tool made of EN-2030 aluminium alloy has been used to date. We replaced this tool with one made of 1.4571 stainless steel. The task of the tool is to reduce the diameter of the pipe to the adequate final diameter. When reducing the diameter of a PTFE thin wall pipe, the temperature of the tool is an extremely important factor, therefore it must be appropriate to ensure an adequate surface quality of the PTFE thin wall pipe. In the graduate thesis we showed the influence of tool temperature on the surface of PTFE thin wall pipes. We were mainly interested in heating the tool and how the tool with inhomogeneous temperature affects the quality of the pipe surface. We established that with old tools made of aluminium alloy EN-2030, uneven heating occurs, which in turn affects the quality of the pipe surface. Due to problems and shrinkage of the old tool, we decided to make a new tool made of 1.4571 stainless steel, which is inserted into the heating base made of aluminium alloy EN-2030. The new tool is heated evenly and therefore the pipe in the tool is also heated evenly, thus ensuring an adequate surface quality of the pipe. With the new tool, several pipes with a more adequate and higher surface quality are produced in the same time interval. The tool heating process was controlled using a Fluke Ti400 thermal imaging camera. Thus, we further confirmed that the old tool heats up unevenly. We also established that the temperature of the new tool is homogeneous and appropriate across the entire surface of the tool. The surfaces of the pipes were also examined under an optical and scanning electron microscope.

• Keywords: PTFE thin wall pipe, tools, temperature, heating, surface quality