scholarly journals Peculiarities of chip piling in tap chip grooves during thread-cutting in ultra-small holes

2019 ◽  
Vol 2019 (4) ◽  
pp. 26-30
Author(s):  
Максим Ягодкин ◽  
Maksim Yagodkin
Keyword(s):  
Cutting Process ◽  
Cutting Condition ◽  
Thread Cutting ◽  
Chip Removal ◽  
Small Holes

There is considered a thread-cutting process in ultra-small holes. It is revealed that cutting condition toughening arises because of the chip removal complexity and impossibility of chip complete filing in consequence of insufficient chip grooves volume.

scholarly journals RELIABILITY INCREASE OF THREAD CUTTING WITH TAP BORERS IN SUPER-SMALL HOLES

2020 ◽  
Vol 2020 (11) ◽  
pp. 12-17
Author(s):  
Mikhail Kulikov ◽  
Maksim Yagodkin ◽  
Yuriy Kulikov
Keyword(s):  
Aluminum Alloy ◽  
Considerable Increase ◽  
Reliability Theory ◽  
Thread Cutting ◽  
Tool Failure ◽  
Reliability Indices ◽  
Mechanics Of Materials ◽  
Physical Chemical ◽  
Investigation Methods ◽  
Small Holes

The purpose of this work consists in the reliability increase of thread cutting with the use of tap borers in super-small holes of aluminum alloy parts. The investigation methods used are based on classic regulations of the cutting theory, physical-chemical mechanics of materials, reliability theory and methods of statistical analysis. There are revealed the reasons of thread cutting low reliability and tool failure. The effectiveness of edge anode-machining use at thread cutting is researched. On the basis of data obtained there is carried out a calculation of basic indices of thread cutting reliability. A comparative analysis of the processing reliability indices obtained under standard conditions and with the use of the developed circuit of anode-machining is shown, the effectiveness of the latter use is presented. As a result of the investigations carried out there is developed a technology for thread cutting in super-small holes that ensures a considerable increase of reliability and allows excluding hand work during the process.

3D Finite Element Simulation of Hard Turning

2009 ◽  
Vol 69-70 ◽  
pp. 11-15 ◽  
Author(s):  
Cai Xu Yue ◽  
Xian Li Liu ◽  
Dong Kai Jia ◽  
Shu Yi Ji ◽  
Yuan Sheng Zhai
Keyword(s):  
Shear Failure ◽  
Cutting Temperature ◽  
Failure Criteria ◽  
Cutting Process ◽  
Cutting Condition ◽  
Residual Stress Field ◽  
Surface Residual Stress ◽  
Element Simulation ◽  
Side Flow ◽  
Hard Cutting

A 3D model is established in this paper to simulate cutting process of PCBN tool cylindrical cutting hardened steel GCr15 using ABAQUS/Explicit. The model effectively overcomes serious element distortions and cell singularity in high strain domain caused by material large deformation by adopting shear failure criteria and element deletion criteria. In this study cutting force, cutting temperature, surface residual stress field as well as side flow are forecasted of hard cutting process with chamfering tool preparation. It shows that satisfactory results could be obtained by FEM. The simulation results provide theoretical basis for studying hard cutting mechanism and selecting the best cutting condition in practical.

scholarly journals Optimization of Cutting Parameters on Turning Process Based on Surface Roughness Using Response Surface Methodology

2011 ◽  
Vol 117-119 ◽  
pp. 1561-1565
Author(s):  
Muhammad Yusuf ◽  
Mohd Khairol Anuar Ariffin ◽  
N. Ismail ◽  
S. Sulaiman
Keyword(s):  
Surface Roughness ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Cutting Process ◽  
Depth Of Cut ◽  
Cutting Condition ◽  
Dry Cutting ◽  
Optimization Of Cutting Parameters

This paper describes effect of cutting parameters on surface roughness for turning of aluminium alloy 7050 using carbide cutting tool with dry cutting condition. The model is developed based on cutting speed, feed rate and depth of cut as the parameters of cutting process. The selection of cutting process was based on the design of experiments Response Surface Methodology (RSM). The objective of this research is finding the optimum cutting parameters based on surface roughness. The relation between cutting parameters and surface roughness were discussed.

Thermal-Mechanical Responses of Ti-6Al-4V during Orthogonal Cutting Process

2008 ◽  
Vol 273-276 ◽  
pp. 673-678 ◽  
Author(s):  
Mohd Nasir Tamin ◽  
Sudin Izman ◽  
Thet Thet Mon
Keyword(s):  
Shear Band ◽  
Diamond Tool ◽  
Orthogonal Cutting ◽  
Cvd Diamond ◽  
Cutting Edge ◽  
Cutting Process ◽  
Cutting Condition ◽  
Workpiece Material ◽  
Stick Slip ◽  
Mechanical Responses

Orthogonal metal cutting process involves large plastic deformation accompanied by excessive heat generation. This work addresses the thermal-mechanical responses of the workpiece material at the tool-workpiece contact. In this respect, the orthogonal cutting process of Ti-6Al-4V using CVD diamond tool is simulated using finite element method. The cutting condition consists of cutting speed, V=180 m/min, feed rate, t=0.125 mm/rev and width of cut of 1.25 mm. Eulerian formulation with coupled thermal-mechanical analysis is employed in the model. The Johnson- Cook constitutive equation is employed for Ti-6Al-4V workpiece material to accurately simulate the formation of shear bands. The stick-slip friction condition is modeled at the tool-chip interface. The sliding coefficient of friction of 0.8 and the limiting shear stress of 700 MPa for stick-slip condition are determined experimentally. Results show that high temperature and temperature gradient concentrate in the primary shear zone and the contact area between the tool rake face and the chip. A primary shear band is predicted in the workpiece ahead of the tool-workpiece contact face while the secondary shear band is formed in the chip. This highly-deformed shear band is revealed in the microstructure of etched chips. The predicted high strain rate results in build-up edge at tool cutting edge-chip contact. Low cutting condition of V=150 m/min, t=0.125 mm/rev promotes stagnant zone formation that helps preserve the cutting edge of the tool. The maximum predicted temperature at the cutting edge is in excess of 700 °C. Such high temperature level facilitates diffusion of carbon elements into the chips and conversely, elements of titanium into the CVD diamond tool.

2D FEM Estimate of Tool Wear in Hard Cutting Operation: Extractive of Interrelated Parameters and Tool Wear Simulation Result

2009 ◽  
Vol 69-70 ◽  
pp. 316-321 ◽  
Author(s):  
Cai Xu Yue ◽  
Xian Li Liu ◽  
Hong Min Pen ◽  
Jing Shu Hu ◽  
Xing Fa Zhao
Keyword(s):  
Tool Wear ◽  
Cutting Temperature ◽  
Cutting Process ◽  
Wear Loss ◽  
Cutting Condition ◽  
Machined Surface ◽  
Wear Prediction ◽  
Tool Wear Prediction ◽  
Cutting Model ◽  
Hard Cutting

Tool wear plays an important part during cutting process, and wear loss has a close relationship with cutting condition, which affects machined surface mostly. In order to accomplish tool wear prediction in way of FEM, based on founding of cutting model under steady state, interrelated parameters needed for tool wear prediction, such as cutting temperature, contact pressure and raletive sliding velocity are extracted. By compiling Python subprogram and using Abaqus tool in hard cutting process PCBN tool wear is predicted, which provide foundation for optimizing cutting condition.

Contributions on Design and Accomplishing of the Whirling Thread Cutting Devices that could be Adapted for Ordinary Lathes

2013 ◽  
Vol 837 ◽  
pp. 67-70 ◽  
Author(s):  
Gheorghe Creţu
Keyword(s):  
Cutting Process ◽  
Thread Cutting

The cutting of the threaded surfaces using whirling thread cutting devices is considered as one of the most productive cutting methods. From all the whirling thread cutting methods that one which utilise an inner point of contact had became the most utilised, because of the advantages which characterise the cutting process in this case:

scholarly journals Optimization of the parameters of the sewing thread cutting process

2020 ◽  
Vol 4 (1) ◽  
pp. 55-66
Author(s):  
Yuri V Novikov ◽  
Stas Krasner
Keyword(s):  
Mechanical Characteristics ◽  
Garment Industry ◽  
Cutting Process ◽  
Urgent Problem ◽  
Thread Cutting ◽  
Sewing Thread ◽  
Cutting Processes

Sewing thread cutting processes are widely used in semi-automatic machines of the garment industry, and is an urgent problem. There is no scientifically based methodology for designing thread trimming mechanisms for semi-automatic sewing machines. Cutting threads by the method of scissors does not provide complete cutting of all components of the thread in case of insufficient pressing of the knife planes to each other. To ensure complete trimming, a design cutting scheme has been developed and calculation formulas have been obtained for determining the force exerted by the thread on the movable knife, taking into account the mechanical characteristics of the cut sewing thread.

scholarly journals INVESTIGATION OF SOTS AND AMO IMPACT UPON THREAD-CUTTING RELIABILITY IN ULTRA-SMALL HOLES

2018 ◽  
Vol 2018 (4) ◽  
pp. 18-23
Author(s):  
Михаил Куликов ◽  
Mikhail Kulikov ◽  
Максим Ягодкин ◽  
Maksim Yagodkin ◽  
Виталий Иноземцев ◽  
...  
Keyword(s):  
Thread Cutting ◽  
Small Holes

A Study of Parameters of the Sewing Thread Cutting Process

2020 ◽  
pp. 3-12
Author(s):  
S.Y. Krasner ◽  
Y.V. Novikov
Keyword(s):  
Mechanical Characteristics ◽  
Cutting Conditions ◽  
Cutting Process ◽  
Design Parameters ◽  
Topical Issue ◽  
Thread Cutting ◽  
Design Scheme ◽  
Sewing Thread ◽  
Tight Contact ◽  
Cutting Processes

Sewing thread cutting processes are widely used in semi-automatic machines in the garment industry. The lack of scientifically justified methods for designing mechanisms for thread trimming in semi-automatic sewing machines makes studying these processes a topical issue. There are works that examine cutting free-hanging yarn using scissors. However, these results cannot be used to develop mechanisms for thread trimming in semi-automatic sewing machines for the following reasons: the properties of free-hanging yarn and sewing thread vary significantly, and the cutting conditions for the thread that grips the blade of a movable knife are different as well. Another reason is that as a rule, sewing thread cutting occurs in a limited space, which imposes a significant restriction on the design parameters of knives and affects the cutting process. There are no such restrictions when cutting yarn. Cutting threads by the method of scissors does not provide complete cutting of all the components of the thread if the knife blades are not in tight contact with each other. To ensure complete trimming, a design scheme of cutting was developed, and calculation formulas were obtained for determining the force exerted by the thread on the movable knife, taking into account the mechanical characteristics of the cut thread.

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