Experimental studies using a new portable linear rock cutting machine and verification for disc cutters

The aim of this paper is to make a theoretical and experimental study to evaluate the water jet influence on a metallic material used in oilfield manufacturing, using AWJ process. It was investigated how the scattering of the jet has influenced the width of the kerf and neighboring area. The metallic material is P275NL2 which is a low temperature quality steel alloy specially used in petrochemical industry. The experimental tests were made on the waterjet cutting machine model YCWJ-380-1520 using preestablish working conditions. Theoretical investigations were performed using CFD simulation with planar 2D fluid flow on the geometrical model. Graphical correlation was performed between theoretical outcomes given by CFD simulation and experimental results on the regarded material, overlapping on the theoretical searching for the cutting velocity and the hardening velocity limits nearby the kerf.

Download Full-text

Dynamics of Spindle Assembly of Metal-Cutting Machine

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.c6119.029320 ◽

2020 ◽

Vol 9 (3) ◽

pp. 3121-3125

Keyword(s):

Dynamic Characteristics ◽

Metal Cutting ◽

Experimental Studies ◽

Spindle Assembly ◽

Metal Cutting Machine ◽

Method Of Calculation ◽

Cutting Machine ◽

Spindle Unit

The methods of conducting an experiment to study the dynamic characteristics of the elements of the spindle assembly are considered. The results of experimental studies of the dynamics of the spindle assembly of a cutting machine are presented. The method of calculation of dynamic characteristics, and the own frequencies of fluctuation of spindle node of the metal cutting machine «НТ-250М» are described. The design of the features of the spindle unit was carried out in the software «АРМ WINMACHINE».

Download Full-text

Improving the Efficiency of Rock Destruction Tools when Drilling Wells in difficult Mining and Geological Conditions

International Journal of Emerging Trends in Engineering Research ◽

10.30534/ijeter/2021/08932021 ◽

2021 ◽

Vol 9 (3) ◽

pp. 198-202

Keyword(s):

Temperature Regime ◽

Cutting Tool ◽

Cutting Tools ◽

Experimental Studies ◽

Rock Cutting ◽

Rock Destruction ◽

Bottom Hole ◽

Geological Conditions ◽

Difficult Terrain ◽

Forced Cooling

Air blast drilling is effective in the most unfavorable conditions for liquid flushing: when drilling in areas with significant circulation losses, when there are difficulties with water supply, in high mountainous or difficult terrain, or in areas with harsh climates. However, air has a low heat capacity compared to liquid flushing solutions, this affects the operation of rock cutting tools through high contact temperatures with irreversible consequences such as deformation of matrices, destruction of diamonds, grinding, reduction of diamond hardness and tool burns. To prevent these problems, there is a need to develop technical means and technology to effectively ensure the temperature regime of the rock-cutting tool. This article discusses the possibility of normalizing and regulating the temperature regime of the rock-cutting tool due to forced cooling of the cleaning air at the bottom hole to negative temperatures, and a new design of the drilling projectile for drilling with air purging is developed. The results of experimental studies of the developed design of the drilling projectile are also presented.

Download Full-text

RELATIONSHIP BETWEEN ROCK FRAGMENT SIZE DISTRIBUTION, EXCAVATED SURFACE ROUGHNESS AND CUTTER FORCES FROM LINEAR ROCK CUTTING MACHINE EXCAVATION

10.1130/abs/2019am-338175 ◽

2019 ◽

Author(s):

Prosper Ayawah ◽

◽

Leslie Gertsch

Keyword(s):

Surface Roughness ◽

Size Distribution ◽

Fragment Size ◽

Rock Cutting ◽

Rock Fragment ◽

Fragment Size Distribution ◽

Cutting Machine ◽

Cutter Forces

Download Full-text

A comparative study of Schmidt hammer testing procedures with reference to rock cutting machine performance prediction

International Journal of Rock Mechanics and Mining Sciences ◽

10.1016/j.ijrmms.2004.12.002 ◽

2005 ◽

Vol 42 (3) ◽

pp. 466-472 ◽

Cited By ~ 48

Author(s):

R.M. Goktan ◽

N. Gunes

Keyword(s):

Comparative Study ◽

Performance Prediction ◽

Rock Cutting ◽

Schmidt Hammer ◽

Testing Procedures ◽

Machine Performance ◽

Cutting Machine

Download Full-text

Modelling of Rock Cutting with Asymmetrical Disc Tool Using Discrete-Element Method (DEM)

Rock Mechanics and Rock Engineering ◽

10.1007/s00603-021-02611-y ◽

2021 ◽

Author(s):

Grzegorz Stopka

Keyword(s):

Discrete Element Method ◽

Simulation Model ◽

Laboratory Tests ◽

Experimental Studies ◽

Deep Understanding ◽

Discrete Element ◽

Rock Cutting ◽

Analytical Models ◽

Mining Methods ◽

Element Method

AbstractThe use of asymmetrical disc tools for the mining of hard and very hard rocks is a promising direction for developing mechanical mining methods. A significant obstacle in developing mining methods with the use of asymmetric disc tools is the lack of adequate computational methods. A deep understanding of rock–tool interaction can develop industrial applications of asymmetric disc tools significantly. The fundamental problem in designing work systems with asymmetric disc tools is the lack of adequate analytical models to identify tool loads during the mining process. One reasonable approach is to use computer simulation. The purpose of the research was to develop a simulation model of rock cutting using an asymmetrical disc tool and then evaluate the developed model. In the article, the Discrete-Element Method (DEM) in LS-Dyna was adopted to simulate rock cutting with asymmetrical disc tools. Numerical tests were conducted by pushing the disc into a rock sample at a given distance from the sample edge until the material was detached entirely. Two types of rock samples were used in the simulation tests: concrete and sandstone. The independent variables in the study were the disc diameter and the cut spacing. To validate the simulation model, analogous laboratory tests were carried out. The article presents a comparison of the results of simulation and laboratory tests. The given comparison showed good accordance LS-Dyna model with the experimental studies. The proposed test results can be input data for developing simulation models on a larger scale. Thus, it will be possible to consider the complex kinematics of the dynamics of the rock-mining process with disc tools using the DEM simulation.

Download Full-text