scholarly journals Ensuring the quality of the machined holes during the hole truing and reaming on lathe machines

2018 ◽  
Vol 224 ◽  
pp. 01122 ◽  
Author(s):  
Aziz Aliev
Keyword(s):  
Titanium Alloy ◽  
Contact Area ◽  
Adhesive Wear ◽  
Plant Origin ◽  
Adhesive Interaction ◽  
Corrosion Resistant ◽  
Cutting Zone ◽  
Conventional Oils

The article is devoted to studying of the influence of cutting liquids, including those of plant origin, on the roughness of the treated surface during the reaming and deployment in details of titanium alloy, structural and corrosion-resistant steels. The relationships between the characteristics of the adhesive interaction of the tool and the processed materials and the length of the contact area of the tool with the workpiece and heat in the cutting zone are determined. The effectiveness of plant-origin cutting liquids is shown in comparison with conventional oils under conditions of the pronounced adhesive wear.

scholarly journals Machining Ti-6Al-4V Alloy Using Nano-Cutting Fluids: Investigation and Analysis

2021 ◽  
Vol 5 (2) ◽  
pp. 42
Author(s):  
Abdelkrem Eltaggaz ◽  
Ibrahim Nouzil ◽  
Ibrahim Deiab
Keyword(s):  
Surface Finish ◽  
Minimum Quantity Lubrication ◽  
Weight Fraction ◽  
Contact Length ◽  
Al2o3 Nanoparticles ◽  
Compressive Stresses ◽  
Cutting Zone ◽  
The Impact ◽  
Cooling And Lubrication

Minimum Quantity Lubrication nanofluid (MQL-nanofluid) is a viable sustainable alternative to conventional flood cooling and provides very good cooling and lubrication in the machining of difficult to cut materials such as titanium and Inconel. The cutting action provides very difficult conditions for the coolant to access the cutting zone and the level of difficulty increases with higher cutting speeds. Furthermore, high compressive stresses, strain hardening and high chemical activity results in the formation of a ‘seizure zone’ at the tool-chip interface. In this work, the impact of MQL-nanofluid at the seizure zone and the corresponding effects on tool wear, surface finish, and power consumption during machining of Ti-6Al-4V was investigated. Aluminum Oxide (Al2O3) nanoparticles were selected to use as nano-additives at different weight fraction concentrations (0, 2, and 4 wt.%). It was observed that under pure MQL strategy there was significant material adhesion on the rake face of the tool while the adhesion was reduced in the presence of MQL-nanofluid at the tool-chip interface, thus indicating a reduction in the tool chip contact length (TCCL) and reduced seizure effect. Furthermore, the flank wear varied from 0.162 to 0.561 mm and the average surface roughness (Ra) varied from 0.512 to 2.81 µm. The results indicate that the nanoparticle concentration and the reduction in the seizure zone positively influence the tool life and quality of surface finish.

scholarly journals Influence of Sequential CAD/CAM Milling on the Fitting Accuracy of Titanium Three-Unit Fixed Dental Prostheses

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1401
Author(s):  
Doo-Bin Song ◽  
Man-So Han ◽  
Si-Chul Kim ◽  
Junyong Ahn ◽  
Yong-Woon Im ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Computer Aided Design ◽  
Dental Prostheses ◽  
Computer Aided ◽  
Cad Cam ◽  
Fixed Dental Prostheses ◽  
Gap Data ◽  
Aided Design ◽  
Fitting Accuracy

This study investigated the fitting accuracy of titanium alloy fixed dental prostheses (FDP) after sequential CAD/CAM (Computer Aided Design/Computer Aided Manufacturing) fabrication. A three-unit FDP model connecting mandibular second premolars and molars was prepared and scanned to fabricate titanium FDPs by CAD/CAM milling. A total of six FDPs were sequentially milled in one titanium alloy disk using a new set of burs every time (n = 4). The fitting accuracy of FDPs was mesiodistally evaluated by a silicone replica technique and the measurement was triplicated at four different locations: MO (marginal opening), MG (marginal gap), AG (axial gap), and OG (occlusal gap). Data were statistically analyzed using ANOVA and Tukey’s HSD test. The fitting accuracy of PMMA (polymethyl methacrylate) FDPs milled using the worn or new bur were evaluated by the same procedure (n = 6). The mean dimensions of titanium FDP for all measuring positions, except for AG, were significantly increased from the third milling. However, no difference was noted between the first FDP and the second FDP milled with the same set of burs. Severe edge chippings were observed in all milling burs. Detrimental effects of the worn burs on the fitting accuracy were demonstrated in the CAD/CAM-milled PMMA FDP. The results recommend proper changing frequency of cutting burs to achieve the quality of fit and predictable outcomes for dental CAD/CAM prostheses.

Effect of laser rescanning on Ti6Al4V microstructure during selective laser melting

2020 ◽  
pp. 095440542097609
Author(s):  
Weipeng Duan ◽  
Meiping Wu ◽  
Jitai Han
Keyword(s):  
Wear Resistance ◽  
Titanium Alloy ◽  
Selective Laser Melting ◽  
Human Body ◽  
High Impact ◽  
Laser Melting ◽  
Heat Treated ◽  
Volume Porosity ◽  
Biomedical Field

TC4, which is one of the most widely used titanium alloy, is frequently used in biomedical field due to its biocompatible. In this work, selective laser melting (SLM) was used to manufacture TC4 parts and the printed parts were heat-treated using laser rescanning technology. The experimental results showed that laser rescanning had a high impact on the quality of SLMed part, and a different performance on wear resistance can be found on the basis. It can be seen that the volume porosity of the sample was 7.6 ± 0.5% without using any further processing technology. The volume porosity of the sample processed using laser rescanning strategy was decreased and the square-framed rescanning strategy had a relative optimal volume porosity (1.5 ± 0.3%) in all these five samples. With the further decreasing of volume porosity, the wear resistance decreased at the same time. As its excellent bio-tribological properties, the square-framed rescanning may be a potential suitable strategy to forming TC4 which used in human body.

Study of Metal, Silicon Carbide Crystals and Ceramic Bond Transfer to the Surface of Titanium Alloy during Grinding

2021 ◽  
Vol 316 ◽  
pp. 515-520
Author(s):  
Vladimir A. Nosenko ◽  
Alexander V. Fetisov ◽  
Nikita D. Serdyukov
Keyword(s):  
Silicon Carbide ◽  
Titanium Alloy ◽  
Titanium Alloys ◽  
Morphological Analysis ◽  
Abrasive Tool ◽  
Adhesive Interaction ◽  
Dual Beam ◽  
Ceramic Bond ◽  
Wear Products ◽  
Brittle Destruction

The high adhesive activity of titanium alloys in interaction with abrasive materials is the main cause of poor grinding treatment. The most common abrasive material for grinding titanium alloys is silicon carbide. Silicon carbide wheels operate primarily in self-sharpening mode. Wear of the abrasive tool in the self-sharpening mode occurs as a result of brittle destruction of the fret. The purpose of the study was to determine experimentally the crystalline wear products of an abrasive tool, made of silicon carbide, on the treated surface during grinding of a titanium alloy. Samples of VT9 titanium alloy were processed by flat mortise grinding by a wheel of silicon carbide with the use of VOLTES coolant and the characteristic of the abrasive tool - 64CF80L7V. The treated surface was examined on the electron microscope Versa 3D Dual Beam. The condition of the treated surface testifies to the intensive adhesive interaction of the titanium alloy with the abrasive tool. The thickness of the metal deposits reaches 3 microns. As a result of morphological analysis, objects are identified on the treated surface, the appearance of which allows us to attribute them to crystals. The chemical composition of the selected objects was determined by a microprobe analysis in a microscope camera. On the basis of the conducted researches, a presence on the grinded surface of silicon carbide crystals of various sizes and a ceramic ligament is established.

scholarly journals Analysis of Forces in Vibro-Impact and Hot Vibro-Impact Turning of Advanced Alloys

2011 ◽  
Vol 70 ◽  
pp. 315-320 ◽  
Author(s):  
Riaz Muhammad ◽  
Agostino Maurotto ◽  
Anish Roy ◽  
Vadim V. Silberschmidt
Keyword(s):  
Finite Element ◽  
Cutting Forces ◽  
Three Dimensional ◽  
Element Model ◽  
Machining Process ◽  
Strain Rates ◽  
Machining Processes ◽  
Machined Surface ◽  
Cutting Zone

Analysis of the cutting process in machining of advanced alloys, which are typically difficult-to-machine materials, is a challenge that needs to be addressed. In a machining operation, cutting forces causes severe deformations in the proximity of the cutting edge, producing high stresses, strain, strain-rates and temperatures in the workpiece that ultimately affect the quality of the machined surface. In the present work, cutting forces generated in a vibro-impact and hot vibro-impact machining process of Ti-based alloy, using an in-house Ultrasonically Assisted Turning (UAT) setup, are studied. A three-dimensional, thermo-mechanically coupled, finite element model was developed to study the thermal and mechanical processes in the cutting zone for the various machining processes. Several advantages of ultrasonically assisted turning and hot ultrasonically assisted turning are demonstrated when compared to conventional turning.

scholarly journals Studying of Cutting Zone When Finishing Titanium Alloy by Application of Multifunction Measuring System

2013 ◽  
Vol 13 (4) ◽  
pp. 428-431 ◽  
Author(s):  
Andrej Czán ◽  
Michal Sajgalík ◽  
Jozef Holubjak ◽  
Karel Kouril
Keyword(s):  
Titanium Alloy ◽  
Measuring System ◽  
Cutting Zone

scholarly journals The laser-welded joint of an austenitic corrosion-resistant steel and a titanium alloy with an intermediate copper insert

2018 ◽  
Vol 8 (1) ◽  
pp. 42-47 ◽  
Author(s):  
I. A. Veretennikova ◽  
N. B. Pugacheva ◽  
E. O. Smirnova ◽  
N. S. Michurov
Keyword(s):  
Titanium Alloy ◽  
Welded Joint ◽  
Corrosion Resistant Steel ◽  
Resistant Steel ◽  
Corrosion Resistant

scholarly journals Aerospace Titanium Alloy Melt Process Quality Improvements

2020 ◽  
Vol 321 ◽  
pp. 04008
Author(s):  
Andrew Woodfield ◽  
Gérard Lemaitre
Keyword(s):  
Titanium Alloy ◽  
Aircraft Engine ◽  
Federal Aviation Administration ◽  
High Density ◽  
Vacuum Arc ◽  
Quality Improvements ◽  
Jet Engine ◽  
Aircraft Accident ◽  
The U.S

This Jet Engine Titanium Quality Committee (JETQC) paper describes industry quality improvements since 1990. Quality refers to freedom from melt-related hard-alpha and high-density inclusions (HDI). JETQC, formed under the auspices of the U.S. Federal Aviation Administration (FAA) following the Sioux City aircraft accident in 1989, is comprised of U.S., E.U. and Japanese aircraft engine manufacturers to address the quality of premium / rotor quality titanium alloy production. Titanium suppliers provide melt-related inclusion data. JETQC focuses on hard-alpha and HDI inclusion rates in premium quality (PQ) titanium alloy products for critical rotating aircraft engine applications. PQ materials typically are produced via triple vacuum arc re-melt (3XVAR) or hearth melt VAR (HMVAR) processes, but more recently, the Skull plus VAR (SVAR) process has been introduced. Hard-alpha rates have continued to decline over the last decade primarily for the HMVAR process. HDI rates declined in the early 90’s, but more recently the overall rate has stayed approximately constant with inclusions confined to the 3XVAR process. Combining the trends for both hard-alpha and HDIs, the HMVAR process has demonstrated in recent years to be higher quality compared with the 3XVAR process.

scholarly journals Assessment of the quality of peppermint leaves by thin-layer chromatography in some objects of plant origin

2020 ◽  
Vol 19 (5-6) ◽  
pp. 148-154
Author(s):  
Vali A. Sahratov ◽  
Tamara L. Malkova ◽  
Ludmila N. Karpova ◽  
Anna A. Pospelova
Keyword(s):  
Medicinal Plant ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Biologically Active ◽  
Mentha Piperita ◽  
Plant Origin ◽  
Plant Materials ◽  
Layer Chromatography ◽  
Active Substances

The State Pharmacopoeia of the XIV edition defines the approach for the assessment of the quality of medicinal plant materials, it deals with the identification of the main groups of biologically active substances by thin layer chromatography. According to this approach, the analysis of some types of medicinal plant materials as a part of some objects of plant origin was carried out. The article presents the quality assessment algorithm as examplified by peppermint leaves (Mentha piperita L.), which are part of a variety of plant object.

Experimental Research on Deep Hole Honing of Difficult-to-Cut Materials Based on Mixture-Abrasive Honing Stones

2009 ◽  
Vol 416 ◽  
pp. 461-466
Author(s):  
Lin Zhu ◽  
Peng Hai ◽  
De Ming Xiao
Keyword(s):  
Stainless Steel ◽  
Titanium Alloy ◽  
Precipitation Hardening ◽  
Comprehensive Evaluation ◽  
High Hardness ◽  
Deep Hole ◽  
Shape Accuracy ◽  
Optimum Proportion ◽  
Abrasive Property

The deep hole honing is an effective and precise method in deep hole processing. It can remove the machining allowance to ensure the hole size and the shape accuracy, and have better surface quality of a hole. The difficult-to-cut materials such as precipitation-hardening stainless steel, stainless steel (1Cr18Ni9Ti) and titanium alloy have the properties of high hardness, wear resistance, heat resistance, and corrosion resistance. The conventional single-abrasive honing stones can not handle the difficult-to-cut materials effectively because of their single-abrasive property. For higher efficiency, more than ten of mixture-abrasive honing stones with different proportion of different abrasives have been designed and the contrast experiments have been done for different mixture-abrasive honing stones to grind precipitation-hardening stainless steel, stainless steel (1Cr18Ni9Ti) and titanium alloy. According to several comprehensive evaluation factors of the grinding ratio, the specific grinding energy and the area that the honed chips stick the oilstones surface, the optimum proportion of different abrasives have been found for honing difficult-to-cut materials. It can be observed that the mixture-abrasive honing stones have better performance than that of single-abrasive stones when honing certain kind of difficult-to-cut materials.

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