Nadogradnja uređaja za ispitivanje hrapavosti Perthometer S8P

master's thesis

• Title (english): The upgrade of stylus instrument Perthometer S8P
• Author: Maja Grbavac
• Mentor: Gorana Baršić (mentor)
• Committee member: Danko Brezak (predsjednik povjerenstva)
• Committee member: Ivica Garašić (član povjerenstva)
• Committee member: Gorana Baršić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2020-01-23, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Production Mechanical Engineering

Abstract

U uvodnom dijelu rada je definiran pojam hrapavosti površina te su opisani 2D parametri hrapavosti, a detaljnije oni koji su se mjerili u eksperimentalnom dijelu rada. Nakon toga opisani su elektroničko-mehanički uređaji s ticalom; njihova opća konfiguracija te sustavi vođenja ticala. Navedene su i greške koje se mogu javiti prilikom mjerenja korištenjem uređaja s ticalom. Detaljnije je opisan mjerni uređaj Perthometer S8P na kojem su se provodila mjerenja.
U nastavku rada predložena je nadogradnja mjernog uređaja Perthometer S8P kojom bi se osigurala točnost pozicioniranja mjerne igle ticala. Opisani su nadograđeni elementi (kamera i translacijski elementi) te su navedene njihove tehničke specifikacije. Potom je naveden način povezivanja elemenata s uređajem za mjerenje hrapavosti pomoću kojeg se osiguravala potrebna krutost sustava.
Detaljno je opisan način određivanja položaja mjernih tragova na uzorku te način određivanja koordinata početnih mjernih točaka na mjernoj površini etalona. Naveden je utjecaj dimenzija mjerne površine etalona te iznos potrebnog cut-offa na raspored mjernih tragova na mjernoj površini. Predložena su četiri različita načina raspodjele mjernih tragova na mjernoj površini s obzirom na ograničenja. Potom su odabrani etaloni koji su se koristili za mjerenje. Prema njihovim dimenzijama i potrebnom cut-offu odabrani su prikladni rasporedi mjernih tragova na mjernoj površini za svaki od etalona te su izračunate koordinate početnih mjernih točaka.
Potom je opisan način na koji su se, preko mjerenog etalona, u odnos dovodili položaj mjerne igle ticala, položaj nitnog križa kamere te položaj translacijskih elemenata. Nakon povezivanja tih triju elemenata, etalon se pomoću translacijskih elemenata pomicao na izračunate koordinate početnih točaka te se provodilo mjerenje tragova na mjernoj površini etalona. Rezultati mjerenja su potom prikazani grafički i brojčano te su komentirani ostvareni rezultati.

Abstract (english)

The introductory part of the paper explains the term surface roughness and describes 2D roughness parameters, in more detail those measured in the experimental part of the paper. After that, the measuring stylus devices are described; their general configuration and the ways to guide the probe. Mistakes that may occur when measuring with stylus device are listed. A Perthometer S8P measuring device is especially described because it was used for measurements in the experimental part of the project.
An upgrade of the Perthometer S8P measuring device is proposed to ensure the accuracy of the positioning of the measuring needle of the stylus mesauring device. Upgrade elements (camera and translational elements) are described and their technical specifications are listed. Afterwards it is stated how these upgrade elements are connected to the roughness measuring device to provide the required rigidity to the system.
The method of determining the position of the measuring traces on the sample and the way of calculating the coordinates of the initial measuring points on the measuring surface of the standard are described in detail. The influence of the dimensions of the measuring surface of the roughness standard and the influence of the required cut-off on the arrangement of measuring traces on the measuring surface is described. Four different ways of distributing measuring traces on the measuring surface are proposed given the limitations. The standards that were used for the measurement were then selected. According to their dimensions and the required cut-off, suitable arrangements of the measuring traces on the measuring surface were selected for each of the standards and the coordinates of the initial measuring points were calculated.
Paper then describes how the position of the measuring needle, the position of the camera's cross, and the position of the translational elements were brought into the relationship via measured roughness standard. After connecting these three elements, the standard moved with translational elements to the positions of the starting points and trace measurements were carried out on the measurement surface of the standard. The measurement results are presented graphically and numerically. Obtained results were then commented.

• Keywords: hrapavost; parametri hrapavosti; etalon; elektroničko-mehanički uređaj s ticalom; vizijski sustav; translacijski element; pozicioniranje
• Keywords (english): roughness; roughness parameters; roughness standard; stylus device; vision system; translational element; precise positioning
• Language: croatian
• URN:NBN: urn:nbn:hr:235:200672
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-01-19 18:08:00