A Study on Rock Cutting Forces and Wear Mechanisms of Coated Picks by Lab-Scale Linear Cutting Machine

2019 ◽  
pp. 467-475
Author(s):  
Sathish Kumar Palaniappan ◽  
Samir Kumar Pal ◽  
M. P. Dikshit
Keyword(s):  
Wear Mechanisms ◽  
Cutting Forces ◽  
Rock Cutting ◽  
Cutting Machine

scholarly journals Experimental Study of tool Wear Mechanisms in Conventional and High Pressure Coolant Assisted Machining of Titanium Alloy Ti17

2013 ◽  
Vol 554-557 ◽  
pp. 1961-1966 ◽  
Author(s):  
Yessine Ayed ◽  
Guenael Germain ◽  
Amine Ammar ◽  
Benoit Furet
Keyword(s):  
High Pressure ◽  
Titanium Alloy ◽  
Tool Wear ◽  
Titanium Alloys ◽  
Tool Life ◽  
Wear Mechanisms ◽  
Cutting Forces ◽  
Cutting Edge ◽  
Rake Face ◽  
High Pressure Coolant

Titanium alloys are known for their excellent mechanical properties, especially at high temperature. But this specificity of titanium alloys can cause high cutting forces as well as a significant release of heat that may entail a rapid wear of the cutting tool. To cope with these problems, research has been taken in several directions. One of these is the development of assistances for machining. In this study, we investigate the high pressure coolant assisted machining of titanium alloy Ti17. High pressure coolant consists of projecting a jet of water between the rake face of the tool and the chip. The efficiency of the process depends on the choice of the operating parameters of machining and the parameters of the water jet such as its pressure and its diameter. The use of this type of assistance improves chip breaking and increases tool life. Indeed, the machining of titanium alloys is generally accompanied by rapid wear of cutting tools, especially in rough machining. The work done focuses on the wear of uncoated tungsten carbide tools during machining of Ti17. Rough and finish machining in conventional and in high pressure coolant assistance conditions were tested. Different techniques were used in order to explain the mechanisms of wear. These tests are accompanied by measurement of cutting forces, surface roughness and tool wear. The Energy-dispersive X-ray spectroscopy (EDS) analysis technique made it possible to draw the distribution maps of alloying elements on the tool rake face. An area of material deposition on the rake face, characterized by a high concentration of titanium, was noticed. The width of this area and the concentration of titanium decreases in proportion with the increasing pressure of the coolant. The study showed that the wear mechanisms with and without high pressure coolant assistance are different. In fact, in the condition of conventional machining, temperature in the cutting zone becomes very high and, with lack of lubrication, the cutting edge deforms plastically and eventually collapses quickly. By contrast, in high pressure coolant assisted machining, this problem disappears and flank wear (VB) is stabilized at high pressure. The sudden rupture of the cutting edge observed under these conditions is due to the propagation of a notch and to the crater wear that appears at high pressure. Moreover, in rough condition, high pressure assistance made it possible to increase tool life by up to 400%.

scholarly journals Solution for the Location of Rock Cutting Elements Relative to the Rotation Center of Geohod

2019 ◽  
Vol 105 ◽  
pp. 03001 ◽  
Author(s):  
Valery Nesterov ◽  
Vladimr Aksenov ◽  
Vladimir Sadovets ◽  
Dmitry Pashkov
Keyword(s):  
Cutting Forces ◽  
Complex Shape ◽  
Rock Cutting ◽  
General Information ◽  
Technical Solution ◽  
Helical Surface ◽  
Body Form ◽  
Rotation Center ◽  
Different Types ◽  
The Face

The article presents the technical solution for the location of cutting elements relative to the rotation center of Geohod for destructing rocks with a strength up to 1 of Protodyakonov hardness. The relevancy of the research is considered. General information about Geohod is given. The features of working body of Geohod are described, in particular, the formation of a complex shape of the face and the working body, and it is also said that in the case of screw movement of working body of Geohod to the face, the points of working body form a helicoidal (helical) surface. To set the purpose and objectives of the study the geometric parameters of generatrix are justified. The parameter depending on the number of blades and on the radius of location of the blade’s cut is identified. Based on the study, the dependence of the number of blades on their location from the center to the periphery is determined. The design of blade working body of Geohod for rocks with a strength f <1 of Protodyakonov hardness is offered. Also the directions for further research have been identified, which include: the development of methods for calculating cutting forces for a technical solution for the location of cutting elements relative to the center of rotation of Geohod for destructing rocks up to 1 of Protodyakonov hardness; the application of this technique for obtaining variants of the blade working body of Geohod of different types.

The Wear of Thermally Stable Diamond During Rock Cutting

1994 ◽  
Vol 116 (4) ◽  
pp. 268-272 ◽  
Author(s):  
G. Cooper ◽  
Z. Liu ◽  
M. Yang
Keyword(s):  
Cutting Forces ◽  
Cutting Speed ◽  
Power Input ◽  
Rock Cutting ◽  
Cutting Conditions ◽  
Depth Of Cut ◽  
Thermally Stable ◽  
Cutting Experiments

Single-cutter experiments have been performed to investigate the cutting and wear of thermally stable diamond (SYNDAX3) during rock cutting. Cutting forces increase linearly with depth of cut, but are unaffected by cutting speed. The wear of the cutter per mass of rock removed is found to decrease with increasing depth of cut. Excessive cutting speed is harmful to the cutter since both the cutter temperature and the change in cutter temperature per power input increase with cutting speed. In the cutting experiments, evidence of delayed fracturing is observed. For essentially constant cutting conditions, fractures develop in the cutter only after a significant amount of cutting is done. Damage of this type is very harmful to the cutter as cutter temperature rises and efficiency drops with increasing wear.

scholarly journals Introduction of Rock Cutting Machine “2500SM” into Limestone Mining Site and Its Effect

2020 ◽  
Vol 136 (6) ◽  
pp. 52-63
Author(s):  
Yasuhiko OKAMOTO ◽  
Masaki KAWAHATA ◽  
Tomoyuki SHOUDAI ◽  
Kouhei TSUJIMOTO
Keyword(s):  
Rock Cutting ◽  
Mining Site ◽  
Cutting Machine

Experimental Investigations of Tool Wear Mechanisms in Machining 1Cr18Ni9Ti Stainless Steel

2010 ◽  
Vol 97-101 ◽  
pp. 1858-1862
Author(s):  
Fa Zhan Yang ◽  
Jun Zhao ◽  
Cheng Liang Sun ◽  
Guang Yao Meng
Keyword(s):  
Stainless Steel ◽  
Tool Wear ◽  
Stainless Steels ◽  
Wear Mechanisms ◽  
Cutting Forces ◽  
Austenitic Stainless Steels ◽  
Cutting Parameters ◽  
Experimental Investigations ◽  
Measuring Device ◽  
Tool Wear Mechanisms

The purpose of this investigation is to recognize the wear mechanisms of cemented carbide tools in dry hard turning of stainless steel (1Cr18Ni9Ti). From the view point of machining, stainless steels are often considered as poor machinability materials. Turning tests were carried out by using a CA6140 lathe and a cutting force measuring device. For this purpose, both microscopic and microstructural aspects of the tools were taken into consideration. Meanwhile, the cutting forces are also measured in the experiment. The chips were analyzed by scanning electron microscopy. The machinability of 1Cr18Ni9Ti austenitic stainless steels is examined in terms of tool life and cutting parameter presented in this paper. Results show that cutting forces vary greatly with the experimental cutting parameters. Analysis indicated that tool wear mechanisms observed in the machining tests involve abrasion wear, thermal and fatigue shock wear and adhesive wear.

scholarly journals Numerical Simulation of Fragment Separation during Rock Cutting Using a 3D Dynamic Finite Element Analysis Code

2017 ◽  
Vol 2017 ◽  
pp. 1-17 ◽  
Author(s):  
Zhenguo Lu ◽  
Lirong Wan ◽  
Qingliang Zeng ◽  
Xin Zhang ◽  
Kuidong Gao
Keyword(s):  
Numerical Simulation ◽  
Compressive Strength ◽  
Linear Relationship ◽  
Specific Energy ◽  
Cutting Forces ◽  
Rock Cutting ◽  
Cutting Depth ◽  
Conical Pick ◽  
Simulation Results ◽  
Base Rock

To predict fragment separation during rock cutting, previous studies on rock cutting interactions using simulation approaches, experimental tests, and theoretical methods were considered in detail. This study used the numerical code LS-DYNA (3D) to numerically simulate fragment separation. In the simulations, a damage material model and erosion criteria were used for the base rock, and the conical pick was designated a rigid material. The conical pick moved at varying linear speeds to cut the fixed base rock. For a given linear speed of the conical pick, numerical studies were performed for various cutting depths and mechanical properties of rock. The numerical simulation results demonstrated that the cutting forces and sizes of the separated fragments increased significantly with increasing cutting depth, compressive strength, and elastic modulus of the base rock. A strong linear relationship was observed between the mean peak cutting forces obtained from the numerical, theoretical, and experimental studies with correlation coefficients of 0.698, 0.8111, 0.868, and 0.768. The simulation results also showed an exponential relationship between the specific energy and cutting depth and a linear relationship between the specific energy and compressive strength. Overall, LS-DYNA (3D) is effective and reliable for predicting the cutting performance of a conical pick.

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