scholarly journals Evaluating the Hole Quality Produced by Vibratory Drilling: Additive Manufactured PLA+

2021 ◽  
Author(s):  
Mohammad Baraheni ◽  
Mohammad Reza Shabgard ◽  
Saeid Amini
Keyword(s):  
Lactic Acid ◽  
Surface Quality ◽  
Thrust Force ◽  
Quality Parameters ◽  
Poly Lactic Acid ◽  
Hole Quality ◽  
Chip Type ◽  
Ultrasonic Drilling ◽  
Important Study

Abstract Improving the surface quality of additive manufactured parts like poly lactic acid (+) is an important study that is currently being carried out by researchers. To reach the high quality, different conventional and non-conventional methods are applied. In this study, the capability of ultrasonic vibration in drilling of an additive manufactured poly lactic acid (+)was examined. The process was implemented in two methods: conventional and vibratory drilling. Then, thrust force and chip type were analyzed and the effect of them on surface roughness, delamination, circularity, and cylindricality have been investigated. As a result, it was indicated that lower thrust force and broken chips, which were generated in ultrasonic drilling, caused the surface quality parameters to be improved compared to the conventional method.

scholarly journals Drilling of Additive Manufactured Poly Lactic Acid Modified byDrilling of Additive Manufactured Poly Lactic Acid Modified by Ultrasonic Vibration Ultrasonic Vibration

2021 ◽  
Author(s):  
Mohammad Baraheni ◽  
Mohammad Reza Shabgard ◽  
Saeid Amini
Keyword(s):  
Lactic Acid ◽  
Ultrasonic Vibration ◽  
Cutting Tool ◽  
Poly Lactic Acid ◽  
Drilling Process ◽  
Manufacturing Method ◽  
Ultrasonic Drilling ◽  
Chip Adhesion ◽  
The Stability

Abstract Complex geometries can be produced by using additively manufacturing method (AM). As usual, the AM parts have rough surfaces in which post processing operations are needed. One of the useful operations is ultrasonic drilling process. In this process, an additional movement is added to the cutting tool to improve the machinability factors. In this study, poly lactic acid(+) was selected as workpiece where the quality of the holes generated by ultrasonic drilling, were investigated. The examination parameters were delamination, circularity, and cylindricality. As a result, it was shown that UD process could properly improve the examination parameters. It was explained that harmonic movement of drill bit in UD improved the stability of the process by a decrease in cutting forces and chip adhesion. Moreover, a significant reduction was observed in delamination factor by using ultrasonic vibrations.

scholarly journals Improving the quality of biopolymer (poly lactic acid) with the addition of bentonite as filler

2017 ◽  
Vol 222 ◽  
pp. 012008 ◽  
Author(s):  
Suryani ◽  
Harry Agusnar ◽  
Basuki Wirjosentono ◽  
Teuku Rihayat ◽  
Nurhanifa
Keyword(s):  
Lactic Acid ◽  
Poly Lactic Acid

Comparative Study of Material Damage and Tool Wear Mechanisms During Drilling of CFRP/Ti Stack

2019 ◽  
Author(s):  
Vijayathithan Mathiyazhagan ◽  
Anil Meena
Keyword(s):  
Tool Wear ◽  
Surface Quality ◽  
Cutting Parameters ◽  
Burr Formation ◽  
Mechanical And Thermal Properties ◽  
Hole Quality ◽  
Structural Functions ◽  
Tool Wear Mechanisms ◽  
Rapid Tool

Abstract The usage of CFRP and Ti stacks in the aerospace industry has widely increased due to its mechanical properties and improved structural functions but at the same time, different mechanical and thermal properties of the CFRP and Ti makes the process difficult. Major apprehensions in the drilling of CFRP/Ti stacks include rapid tool wear and poor hole quality. Typically, the surface quality of the holes in the drilling of CFRP/Ti stack is poor due to delamination, the progression of hole diameter in CFRP and burr formation in Ti. Moreover, the flank wear on the tool also influences the surface quality of the hole produced. Therefore, the present study is mainly focused on the influence of cutting parameters on cutting forces, hole quality and tool wear characteristics. Drilling was performed on CFRP/Ti stack using coated and uncoated carbide tools. The obtained results revealed a significant correlation between tool wear and delamination characteristics.

Appling Fuzzy Logic for Optimization Formulation of Sapphire Precision Grinding

2010 ◽  
Vol 129-131 ◽  
pp. 1217-1221
Author(s):  
Xiao Wang ◽  
Cong Da Lu
Keyword(s):  
Fuzzy Logic ◽  
Surface Quality ◽  
Fuzzy Theory ◽  
Engineering Application ◽  
Processing Parameters ◽  
Quality Parameters ◽  
Precision Grinding ◽  
Processing Efficiency ◽  
Optimization Parameters

Fuzzy logic is a mathematical theory of inexact reasoning that allows modeling of the reasoning process of humans in linguistic terms, and it is an effective method approved to deal with the fuzzy objects in many areas of engineering application. The purpose of this paper is to explore the relationship between grinding process parameters and surface quality parameters of sapphire wafer by using fuzzy theory and to obtain optimization parameters to enhance the processing efficiency and higher the surface quality of the sapphire in ultra-precision grinding. This paper sets up the triangular fuzzy logic model between processing parameters and surface quality parameters for precision lapping of sapphire, and 2 groups of optimization parameters are selected. Finally, the experimental results verified that the optimization parameters of sapphire lapping obtained by using fuzzy logic which can improve the grinding efficiency and the surface quality of sapphire.

Evaluating the deposition quality of parts produced by an open-source 3D printer

2017 ◽  
Vol 23 (4) ◽  
pp. 796-803 ◽  
Author(s):  
Leonardo Santana ◽  
Carlos Henrique Ahrens ◽  
Aurélio da Costa Sabino Netto ◽  
Cassiano Bonin
Keyword(s):  
Lactic Acid ◽  
Process Parameters ◽  
Poly Lactic Acid ◽  
Processing Conditions ◽  
Mass Measurements ◽  
Content Type ◽  
Factors Affecting ◽  
Flexural Tests ◽  
Feedstock Material

Purpose The purpose of this study is to analyze the factors affecting the deposition of parts manufactured in poly(lactic acid) with variations in print speed and extrusion temperature. Specimens were analyzed through optical microscopy, mass measurements and flexural tests. The extruder-head evaluation consisted of monitoring the feedstock material displacement on entering the system during deposition under different processing conditions. Design/methodology/approach To analyze the factors affecting the deposition, parts were manufactured in poly(lactic acid) with variations in print speed and extrusion temperature. Specimens were analyzed through optical microscopy, mass measurements and flexural tests. The extruder-head evaluation consisted of monitoring the feedstock material displacement on entering the system during deposition under different processing conditions. Findings The results showed low repeatability in the manufacturing of parts, as significant variations in the evaluated responses were found for specimens built under the same process parameters. The main cause for this effect was deposition failure, owing to filament slippage in the extruder head hobbed pulley. Practical implications The results found should alert users to the fact that performance tests need to be carried out on every subcomponent of the equipment before conducting experiments on printing parameters. The components of the equipment can influence the final quality of the parts obtained as much as the building parameters and this influence can be significant enough to overlap with that of the process parameters. Originality/value The effect of slippage on the deposition quality was quantified and the command loss in the machine control board was identified.

scholarly journals STRATEGI IMITASI DAN MANAJEMEN PENGETAHUAN DALAM PENGEMBANGAN INOVASI PLA (POLY LACTIC ACID) PADA AGROINDUSTRIKEMASAN BIODEGRADABEL DI INDONESIA

2013 ◽  
Vol 3 (2) ◽  
Author(s):  
Fitry Filianty
Keyword(s):  
Knowledge Management ◽  
Lactic Acid ◽  
Raw Materials ◽  
Raw Material ◽  
Poly Lactic Acid ◽  
Product Imitation ◽  
Imitation Strategy

<p>Indonesia has the potential for development of PLA (Poly Lactic Acid) as biodegradable<br />packaging agroindustry due to the availability of raw material, such as tubers as a source of<br />starch and lignocellulose as a source of cellulose, but Indonesia has limitations in terms of its<br />technology. This was due to the intensity and quality of the research that has not been<br />adequate. For that condition, imitation strategies can be developed for PLA (Poly Lactic Acid)<br />agroindustry in Indonesia and the level of product imitation strategies is knockoff or cloning.<br />At that level, PLA agroindustry to be developed completely replicate existing products but have<br />other brands. With this strategy, the PLA agroindustry is expected to produce a cheaper price<br />product because of the availability of raw materials in Indonesia that easy to fine. Raw<br />material for PLA that can be selected from cassava tubers beacause its easy in cultivation and<br />cheaper among other types of bulbs. To improve competitiveness, the company who built the<br />imitation strategy needs to be managed with the application of knowledge management in<br />order to be able to last long existence.</p>

Quality of ram spermatozoa separated with modified swim up method

2018 ◽  
Vol 33 (2) ◽  
pp. 62-70 ◽  
Author(s):  
A Hossain ◽  
MM Islam ◽  
F Naznin ◽  
RN Ferdousi ◽  
FY Bari ◽  
...  
Keyword(s):  
Semen Quality ◽  
Membrane Integrity ◽  
Quality Parameters ◽  
Fluid Medium ◽  
Normal Morphology ◽  
The Mean ◽  
Mass Activity ◽  
Fresh Semen ◽  
Artificial Vagina

Semen was collected from four rams, using artificial vagina and viability%, motility% and plasma membrane integrity% were measured. Fresh ejaculates (n = 32) were separated by modified swim-up separation using modified human tubal fluid medium. Four fractions of supernatant were collected at 15-minute intervals. The mean volume, mass activity, concentration, motility%, viability%, normal morphology and membrane integrity% (HOST +ve) of fresh semen were 1.0 ± 0.14, 4.1 ± 0.1 × 109 spermatozoa/ml, 85.0 ± 1.3, 89.4 ± 1.0, 85.5 ± 0.7, 84.7 ± 0.5 respectively. There was no significant (P>0.05) difference in fresh semen quality parameters between rams. The motility%, viability% and HOST +ve % of first, second, third and fourth fractions were 53.4 ± 0.5, 68.2 ± 0.3, 74.8 ± 0.3 and 65.5 ± 0.4; 55.5 ± 0.4, 66.2 ± 0.4, 74.5 ± 0.3 and 73.6 ± 0.3 and 66.7 ± 0.5, 66.8 ± 0.5, 65.2 ± 0.4 and 74.7 ± 0.5 respectively. The motility%, viability% and membrane integrity% of separated semen samples differed significantly (P<0.05) between four fractions. The mean motility% and viability% were significantly higher (P<0.05) in third fraction (74.8 ± 0.3%), whereas the mean HOST +ve% was significantly higher (P<0.05) in fourth fraction (74.7 ± 0.5). All quality parameters of separated spermatozoa were significantly (P<0.05) lower than that of fresh semen. The pregnancy rates were higher with fresh semen (71%) in comparison to that of separated sample (57%).Bangl. vet. 2016. Vol. 33, No. 2, 62-70

Electrical Properties of Heat-Treated Poly-Lactic Acid

2011 ◽  
Vol 131 (5) ◽  
pp. 395-400 ◽  
Author(s):  
Toru Oi ◽  
Katsuyoshi Shinyama ◽  
Shigetaka Fujita
Keyword(s):  
Lactic Acid ◽  
Electrical Properties ◽  
Poly Lactic Acid ◽  
Heat Treated

Dielectric Breakdown Properties of Poly-Lactic Acid with Spherulites Growth

2014 ◽  
Vol 134 (4) ◽  
pp. 237-242
Author(s):  
Naru Matsugasaki ◽  
Katsuyoshi Shinyama ◽  
Shigetaka Fujita
Keyword(s):  
Lactic Acid ◽  
Dielectric Breakdown ◽  
Poly Lactic Acid
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