Optimizacija 3D tiskanega veznika za stol

Cvetko, Metod (author), Kariž, Mirko (mentor)

V diplomski nalogi smo preučevali različne verzije 3D tiskanega veznika za stol za domačo rabo. Namen raziskave je bilo nadomestiti originalni kovinski veznik, ki povezuje štiri noge in sedišče stola, s 3D tiskanim veznikom in s tem zmanjšati maso. Pri izdelavi veznika smo želeli uporabiti lesno-plastični kompozit ter s 3D tiskanjem izdelati oblikovno zanimivejši detajl stola. Veznik je bil po originalu modeliran v programu SolidWorks, v katerem so bile narejene tudi simulacije obremenitev. Simulacije so pokazale deformacije in napetosti na vezniku, hkrati pa območja, potrebna ojačitve. Uporabili smo tudi študijo topologije, katere namen je zmanjšati maso izdelka, vendar kljub temu ohraniti trdnost celotnega izdelka, in zmanjšanje deformacij, ki se pojavijo ob delovanju obremenitev. Ojačan model smo s pomočjo študije topologije optimizirali in preoblikovali. Optimizirana 3D tiskana veznika smo natisnili iz polilaktične kisline (PLA) in lesno-plastičnega kompozita ter testirali v Laboratoriju za preizkušanje pohištva po zahtevi standarda SIST EN 12520:2010. Optimiziran 3D tiskan veznik, narejen iz PLA materiala, je zahtevi standarda zadostil, veznik, narejen iz lesno-plastičnega kompozita, pa ni ustrezal, saj je prišlo do loma. Ugotovili smo, da je s simulacijami v programu SolidWorks mogoče dokaj natančno modelirati model, ki bo zadostili zahtevam standarda. S študijo topologije in natančnim poznavanjem lastnosti materialov je mogoče veznik optimizirati ter zmanjšati maso, ne da bi zmanjšali njegove mehanske lastnosti.

• Language: Slovenian
• Keywords: optimizacija, 3D tisk, stol, veznik, trdnost
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Publisher: [M. Cvetko]
• Year: 2020
• PID: 20.500.12556/RUL-119921
• UDC: 630*824.4/.7:684.43
• COBISS.SI-ID: 28379907
• Publication date in RUL: 13.09.2020

Secondary language

• Language: English
• Title: Optimisation of a 3D printed chair connector

Abstract

In this thesis, we studied different versions of a 3D printed chair connector. The purpose of the research was to replace the original metal connector that connects the four legs and the seat of the chair with a 3D printed connector, thus reducing weight. For this purpose, we wanted to use a wood-plastic composite when making the connector and 3D printing to create a more interesting design detail of the chair. The connector was originally modelled in SolidWorks, in which load simulations were also made. Simulations showed deformations and stresses on the connector at the same time as the required reinforcement ranges. We also used a topology study, which aims to reduce the mass of the product, while still maintaining the strength of the whole product and reducing the deformations that occur under the action of loads. The reinforced model was optimised and redesigned using a topology study. Optimised 3D printed connectors were printed from polylactic acid (PLA) and wood-plastic composite and tested in the Furniture Testing Laboratory according to the requirements of the SIST EN 12520:2010 standard. The optimised 3D printed connector made of PLA material met the requirements of the standard, and the connector made of wood-plastic composite did not, as a fracture occurred. We discovered that simulations in SolidWorks make it possible to produce a model that will meet the requirements of the standard quite accurately. With topology study and accurate knowledge of properties of the material it is possible to optimise the connector and reduce weight without reducing the mechanical properties.

• Keywords: optimisation, 3D print, chair, joint, strength