scholarly journals Transition between relieved and unrelieved modes when cutting rocks with conical picks

2021 ◽  
Vol 249 ◽  
pp. 329-333
Author(s):  
Evgenii Averin ◽  
Aleksandr Zhabin ◽  
Andrey Polyakov ◽  
Yurii Linnik ◽  
Vladimir Linnik
Keyword(s):  
Cutting Tool ◽  
Chip Thickness ◽  
Rock Breaking ◽  
Modern Theory ◽  
Calculation Methods ◽  
Large Classes ◽  
Optimal Spacing ◽  
Conical Picks ◽  
Cutting Modes ◽  
Production Conditions

In the modern theory of rock cutting in production conditions, it is customary to distinguish two large classes of achievable cutting modes – relieved and unrelieved. The kinematics of rock-breaking machines in most cases determines the operation of the cutting tool in both modes in one cycle of the cutting tool. The currently available calculation methods have been developed for a stable, usually unrelieved cutting mode. In this article, the task is set to determine the conditions for the transition between cutting modes and the modernization of the calculation method for determining the forces on the cutting tool. The problem is solved by applying methods of algebraic analysis based on the search for the extremum of the force function on the cutter, depending on the ratio of the real cut spacing to the optimal spacing for the current chip thickness. As a result of solving the problem, an expression is obtained for determining the chip thickness, for which, at the specified parameters, the transition between the relieved and unrelieved cutting modes is provided. The obtained result made it possible to improve the method of calculating the forces on the cutting tool in the areas of the cutter movement with relieved cutting.

Experimental investigation of a slip-line field model for a worn cutting tool

2013 ◽  
Vol 228 (8) ◽  
pp. 1398-1404 ◽  
Author(s):  
Alper Uysal ◽  
Erhan Altan
Keyword(s):  
Wear Rate ◽  
Slip Line ◽  
Field Model ◽  
Cutting Tool ◽  
Flank Wear ◽  
Cutting Speed ◽  
Chip Thickness ◽  
Rake Angle ◽  
Uncut Chip Thickness ◽  
Line Field

In this study, the slip-line field model developed for orthogonal machining with a worn cutting tool was experimentally investigated. Minimum and maximum values of five slip-line angles ( θ1, θ2, δ2, η and ψ) were calculated. The friction forces that were caused by flank wear land, chip up-curl radii and chip thicknesses were calculated by solving the model. It was specified that the friction force increased with increase in flank wear rate and uncut chip thickness and it decreased a little with increase in cutting speed and rake angle. The chip up-curl radius increased with increase in flank wear rate and it decreased with increase in uncut chip thickness. The chip thickness increased with increase in flank wear rate and uncut chip thickness. Besides, the chip thickness increased with increase in rake angle and it decreased with increase in cutting speed.

scholarly journals Methodology of designing integrated technological processes for manufacturing CNC machined parts

2018 ◽  
Vol 224 ◽  
pp. 01057
Author(s):  
Viktor I. Guzeev ◽  
Danil Yu. Pimenov
Keyword(s):  
Simulation Modeling ◽  
Metal Cutting ◽  
Cutting Tool ◽  
New Approach ◽  
Integrated Production ◽  
Technological Processes ◽  
Machined Parts ◽  
Processing Accuracy ◽  
Processing Steps ◽  
Production Conditions

The article presents a new approach to the design of technological processes of processing parts on metal cutting machines in the integrated production conditions based on the expected forecast of the parts processing accuracy. The stages of choosing the parameters of processing steps are combined with determining the parameters of the cutting tool and machining attachments by simulation modeling. The design sequence begins with the first operation.

Influence of Depth of Cut on Contact Phenomenon in Micromachining

2014 ◽  
Vol 660 ◽  
pp. 8-12
Author(s):  
J.B. Saedon ◽  
Noor Aniza Norrdin ◽  
Mohd Azman Yahaya ◽  
N.H. Mohamad Nor ◽  
Mohd Zulhafiz Md Salih
Keyword(s):  
Cutting Tool ◽  
Chip Thickness ◽  
Rake Angle ◽  
Depth Of Cut ◽  
Work Piece ◽  
Arbitrary Lagrangian Eulerian ◽  
Contact Phenomenon ◽  
Aisi D2 ◽  
Material Separation ◽  
Contact Distribution

Chip formation is a dynamic process that is often nonlinear in nature. A chip may not form when the depth of cut is less than a minimum chip thickness. It is aimed to investigate influence of depth of cut on contact phenomenon in micromachining. This paper presents a series of simulation works by finite element method on depth of cut effect on micromachining. A model is developed with consideration of the Johnson-Cook material and Arbitrary Lagrangian–Eulerian (ALE) method. In this work investigate the effect of depth of cut on the contact phenomenon during micromachining AISI D2. The results of the analysis are showed in aspects of interrelationship between material separation and frictional shear contact, distribution of stick-slide regions and contact stress on the work piece and cutting tool. It is found that the sticking and sliding was occurred on three zones as primary, secondary and tertiary shear zone. The contact phenomena can be showed around the tool edge radius where material flows around it and piles in front of the cutting tool through material separation. The investigation of contact phenomena inclusive under three criteria such as a/r < 1, a/r > 1 and a/r = 1 on positive rake angle.

scholarly journals Experiment on Conical Pick Cutting Rock Material Assisted with Front and Rear Water Jet

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Xiaohui Liu ◽  
Songyong Liu ◽  
Lie Li ◽  
Xinxia Cui
Keyword(s):  
Cutting Tools ◽  
Rock Breaking ◽  
Water Jet ◽  
Break Rock ◽  
Conical Pick ◽  
Advantages And Disadvantages ◽  
Pressure Water ◽  
Quantitative Results ◽  
Conical Picks ◽  
High Pressure Water Jet

Conical picks are one kind of cutting tools widely used in engineering machinery. In the process of rock breaking, the conical pick bears great cutting force and wear. To solve the problem, a new method, conical pick assisted with high pressure water jet, could break rock effectively, and four different configuration modes of water jet were presented. In this paper, based on the analysis of the different water jet configuration’s advantages and disadvantages, experiments on front water jet, new typed rear water jet, and the combination of those two water jet configuration modes were conducted to study the assisting cutting performance and obtain the quantitative results.

scholarly journals Study of the effect of positioning accuracy of system rigidity and part quality in waterjet cutting

2021 ◽  
Vol 266 ◽  
pp. 04003
Author(s):  
Sh. S. Nozirzoda ◽  
S. E. Bukhanchenko
Keyword(s):  
Control Systems ◽  
Cutting Tool ◽  
Experimental Studies ◽  
Positioning System ◽  
Waterjet Cutting ◽  
Part Quality ◽  
Improve Accuracy ◽  
Processing Zone ◽  
Cutting Modes

This paper discusses ensuring the specified accuracy and quality of processing parts of various shapes by scientifically validatedchoiceof the processing zone, cutting modes, and making adjustments to the control systems of the technological system for waterjet cutting. In the course of experimental studies, the stiffness of the positioning system for the installation of awaterjet cutting tool, the accuracyand quality of processing with waterjet cutting were determined. The influenceof the stiffness of the positioning system of the abra-sive waterjet cuttingtool on the accuracyand quality of the surface of the ob-tained products and the ways to improve accuracy were determined. Based on the results of the study, recommendations to improve the accuracy and quality of partsare given.

The use of assembled cutting tool with damping elements to reduce mechanical vibrations

2021 ◽  
Author(s):  
Keyword(s):  
High Speed ◽  
Metal Cutting ◽  
Cutting Tool ◽  
End Mill ◽  
Mechanical Vibrations ◽  
Machined Surface ◽  
High Speed Cutting ◽  
End Mills ◽  
Cutting Modes

Aspects of vibration reduction during machining on metal-cutting machines to improve the quality of machined surfaces at moderate and high-speed cutting modes are considered. End mills with damping elements made of different materials, which provide the control of tool rigidity, are developed. Keywords: vibrations, end mill, vibrations, machined surface, damping. [email protected]

Analysis of End Milling Surface Error Considering Tool Compliance

1998 ◽  
Vol 120 (1) ◽  
pp. 207-210 ◽  
Author(s):  
S. Y. Liang ◽  
Li Zheng
Keyword(s):  
Cutting Tool ◽  
End Milling ◽  
Angular Position ◽  
Chip Thickness ◽  
Bending Moment ◽  
Shear Loading ◽  
Machining Parameters ◽  
Surface Error ◽  
Relationship Of ◽  
The Relationship

An analytical model of surface height error in end milling due to the elastic compliance of cutting tool is presented. Based on the relationship of local cutting forces and chip thickness, the shear loading and bending moment on tool cross section are presented in terms of cutter angular position. The tool deflection responding to the bending moment is then established including the consideration of workpiece and machine tool structural deflection. The expression for surface error is derived as a closed-form function of the machining parameters, cutting configuration, material characteristics, and machine receptance.

Tool Coatings with the Effect of Adaptation to Cutting Conditions

2011 ◽  
Vol 496 ◽  
pp. 75-79 ◽  
Author(s):  
Mars Migranov ◽  
Regina Migranov
Keyword(s):  
High Speed ◽  
Heat Dissipation ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Chip Thickness ◽  
Shear Plane ◽  
Wear Resistant Coatings ◽  
Tool Coatings ◽  
The Coefficient Of Friction ◽  
Tribological Parameters

The objective of the present work is to study tribological properties of multilayered wear resistant coatings on the cutting tools. Two types of coatings (TiAl)N were studied: normal monolayer coating and improved coating. The tests were conducted with cooling, and without it. During high speed machining an intensive tribo-oxidation of tool surface occurs. Formation of aluminum oxide films on the surface of cutting tool significantly changes the heat flow and heat dissipation into the chip. Conditions of the chips formation (chip thickness ratio and the shear plane angle) and the coefficient of friction on the rake face of the cutting tool have been measured during the cutting process. The results demonstrated significant improvement of tribological parameters for the cutting tools with filtered coatings.

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