Linear Rock Cutting with SMART*CUT Picks

2013 ◽  
Vol 477-478 ◽  
pp. 1378-1384 ◽  
Author(s):  
Wen Shao ◽  
Xing Sheng Li ◽  
Yong Sun ◽  
Han Huang
Keyword(s):  
Hard Rock ◽  
Normal Force ◽  
Cutting Tools ◽  
Rock Cutting ◽  
Attack Angle ◽  
High Wear Resistance ◽  
Depth Of Cut ◽  
Good Thermal Stability ◽  
Cutter Forces ◽  
Selection Of

The short life due to heavy wear is a bottleneck that limits the usage of mechanical excavators for hard rock cutting. Thermally stable diamond composite (TSDC) tipped cutting tools have the main advantages of good thermal stability, high wear resistance and ability to mine harder deposit compared to the conventional tungsten carbide (WC) tipped cutting tools. Super Material Abrasive Resistant Tool (SMART*CUT) based on TSDC tip has been developed by CSIRO to improve the effectiveness of cutting tools when dealing with hard deposit in mining and civil industries. In this study, the effects of attack angle and depth of cut on the cutting performance of SMART*CUT picks in different cutting orientations were investigated. A tri-axial dynamometer and a data acquisition system were used to measure the cutter forces. Normal force, cutting force and resultant angle were correlated with depth of cut and attack angle. Cutting performances were compared in different cutting orientations. The results would be beneficial to the selection of mechanical excavator motor and the optimization of cutting drum design to some extent.

scholarly journals Numerical Analysis of Laser Preheating for Laser Assisted Micro Milling of Inconel 718

2015 ◽  
Vol 773-774 ◽  
pp. 332-336 ◽  
Author(s):  
E.A. Rahim ◽  
N.M. Warap ◽  
Zazuli Mohid ◽  
Mohd Rasidi Ibrahim ◽  
N. Rafai
Keyword(s):  
Inconel 718 ◽  
Cutting Tools ◽  
Micro Milling ◽  
Depth Of Cut ◽  
Processing Parameter ◽  
New Techniques ◽  
Ansys Apdl ◽  
Strength And Ductility ◽  
Super Alloy ◽  
Selection Of

Micro milling of super alloy materials such as nickel based alloys such as Inconel 718 is challenging due to the excellent of its mechanical properties. Therefore, new techniques have been suggested to enhance the machinability of nickel based alloys by pre-heating the workpiece’s surface to reduce its strength and ductility. The prediction of fluctuated temperature distribution generated by pulsed wave laser in laser assisted micro milling (LAMM) is crucial. The selection of processing parameter by minimize the effect on the processing characteristic is decisive to ensure the machining quality is high. Determining the effect of heat generated in underneath surface is important to make sure that the cutting tools are able to cut the material with maximum depth of cut and minimum defects in terms of tool wear and tool life. In this study the simulation was carried by using Ansys APDL. In order to confirm the actual and distribution irradiation of temperature from simulation, an experimental was done to validate the results. The experiment was conducted by using Nd:YAG laser with wavelength 1064 nm.

Simulation of Disc Cutter Loads Based on ANSYS/LS-DYNA

2011 ◽  
Vol 127 ◽  
pp. 385-389 ◽  
Author(s):  
Xiao Huo Li ◽  
Wei Du ◽  
Zhi Long Huang ◽  
Wei Li Fu
Keyword(s):  
Finite Element ◽  
Hard Rock ◽  
Rolling Force ◽  
Element Model ◽  
Rock Cutting ◽  
Disc Cutter ◽  
Vertical Force ◽  
Prediction Formula ◽  
Cutting Head ◽  
Cutter Forces

In order to solve serious damage of pick on part-face tunnel machine during hard rock cutting, explore the applicability of disc cutter on the machine, the structure of disc cutter was designed, a model of dist cutter was built with Pro/E software, finite element model was established in ANSYS/LS-DYNA, the vertical force and rolling force of a disc cutter were obtained by simulation of cutter cutting. Analysis shows that the disc cutter can cut granite whose hardness is 106.2MPa, so the disc cutter can cut hard rock. The vertical force and rolling force agreed with common prediction formula of disc cutter forces which showed that modeling method is correct and feasible, this paper lays the foundation for the design and development of a cutting head of hard rock roadheader.

Laboratory Comparison of SMART*CUT Picks With WC Picks

2014 ◽  
Vol 1017 ◽  
pp. 323-328 ◽  
Author(s):  
W. Shao ◽  
Xing Sheng Li ◽  
Yong Sun ◽  
Han Huang
Keyword(s):  
Hard Rock ◽  
Cutting Tools ◽  
Infrared Camera ◽  
Polycrystalline Diamond ◽  
Rock Excavation ◽  
Research Organisation ◽  
Recorded Data ◽  
Bonding Technology ◽  
Cutter Forces ◽  
Polycrystalline Diamond Compact

Application of polycrystalline diamond compact (PDC) based cutting tools for hard rock excavation in mining and construction industries has increased significantly in recent years due to their super hardness, superb thermal conductivity and long life durability. Super Material Abrasive Resistant Tool (SMART*CUT) technology has been developed by CSIRO (Commonwealth Scientific and Industrial Research Organisation) in the last 15 years, which includes the replacement of tungsten carbide (WC) tips of the conventional picks with thermally stable diamond composite (TSDC) tips, attachment of the TSDC tips to steel tool bodies with CSIRO’s worldwide patented bonding technology. The wear characteristics of TSDC cutting elements have been investigated previously. In this paper, the preliminary results of cutter forces and resultant angle of SMART*CUT picks were compared with that of traditional WC picks. A tri-axial force dynamometer and a data acquisition system were used to measure the cutter forces. Besides, the cutting area temperature during cutting process was continuously measured by a FLIR SC7600M thermal infrared camera and the recorded data were processed by Altair Software.

scholarly journals The feasibility evaluation of using cyclic thermal effect in the rock-cutting tools during drilling hard rock

2019 ◽  
Vol 109 ◽  
pp. 00026
Author(s):  
Valentyn Hankevich ◽  
Tetiana Moskalova ◽  
Liudmyla Kabakova ◽  
Oksana Livak
Keyword(s):  
Thermal Effect ◽  
Hard Rock ◽  
Frictional Heating ◽  
Cutting Tools ◽  
Rock Cutting ◽  
Mechanical Destruction ◽  
Heated Section ◽  
Drilling Tools ◽  
Feasibility Evaluation

The possibility of using cyclic thermal effect in drilling tools for softening of rocks is considered in the article. It is shown that during drilling in the phase of heating, the rock sections can actually be heated to 1000 °C, and it is possible to achieve even higher temperatures with the use of corresponding frictional heating elements. It has been found that the phase of cooling of the heated section of the rock can ensure guaranteed cracking of the rock for subsequent mechanical destruction.

Laboratory Comparison of Mini-Discs with Point-Attack Picks

2010 ◽  
Vol 126-128 ◽  
pp. 189-194
Author(s):  
Bulent Tiryaki ◽  
Ian D. Gipps ◽  
Xing S. Li
Keyword(s):  
Specific Energy ◽  
Rock Cutting ◽  
Rock Properties ◽  
Crucial Importance ◽  
Rock Excavation ◽  
Preliminary Results ◽  
Normal Forces ◽  
Trimmed Surfaces ◽  
Cutter Forces ◽  
Selection Of

The selection of the cutter type is of crucial importance to maximise the advantages of mechanical rock excavation systems. Specific energy (SE), cutter forces, and rock properties are used to decide what type of cutter is most suitable for economical excavation of the rock based on laboratory rock cutting tests. This study is concerned with the preliminary results of an ongoing rock cutting program in which a mini-disc has been compared with a point-attack pick in laboratory linear cutting tests simulating a cutterhead on a Helidon sandstone block. Analysis of the preliminary results has shown that the mini-disc experienced lower mean cutting forces and was seven times more efficient than the pick in first layer cuts. However, the mini-disc had mean normal forces 1.5 times higher than the pick. Additionally, first layer cuts taken on the trimmed surfaces required more forces and SE than completely relieved cuts in pick cutting.

Experimental and Numerical Investigation into Residual Stress During Turning Operation for Stainless Steel AISI 316

2020 ◽  
Vol 38 (12A) ◽  
pp. 1862-1870
Author(s):  
Safa M. Lafta ◽  
Maan A. Tawfiq
Keyword(s):  
Stainless Steel ◽  
Residual Stresses ◽  
Orthogonal Cutting ◽  
Cutting Tools ◽  
Cutting Speed ◽  
Percentage Error ◽  
Depth Of Cut ◽  
Main Role ◽  
Turning Operation ◽  
Aisi 316

RS (residual stresses) represent the main role in the performance of structures and machined parts. The main objective of this paper is to investigate the effect of feed rate with constant cutting speed and depth of cut on residual stresses in orthogonal cutting, using Tungsten carbide cutting tools when machining AISI 316 in turning operation. AISI 316 stainless steel was selected in experiments since it is used in many important industries such as chemical, petrochemical industries, power generation, electrical engineering, food and beverage industry. Four feed rates were selected (0.228, 0.16, 0.08 and 0.065) mm/rev when cutting speed is constant 71 mm/min and depth of cutting 2 mm. The experimental results of residual stresses were (-15.75, 12.84, 64.9, 37.74) MPa and the numerical results of residual stresses were (-15, 12, 59, and 37) MPa. The best value of residual stresses is (-15.75 and -15) MPa when it is in a compressive way. The results showed that the percentage error between numerical by using (ABAQUS/ CAE ver. 2017) and experimental work measured by X-ray diffraction is range (2-15) %.

scholarly journals Potential for Aquifer Storage and Recovery (ASR) in South Bihar, India

2021 ◽  
Vol 13 (6) ◽  
pp. 3502
Author(s):  
Somnath Bandyopadhyay ◽  
Aviram Sharma ◽  
Satiprasad Sahoo ◽  
Kishore Dhavala ◽  
Prabhakar Sharma
Keyword(s):  
Pilot Study ◽  
Environmental Sustainability ◽  
Hard Rock ◽  
Climatic Conditions ◽  
Aquifer Storage And Recovery ◽  
Aquifer Recharge ◽  
Aquifer Storage ◽  
Cropping Season ◽  
Selection Of ◽  
Surface Technique

Among the several options of managed aquifer recharge (MAR) techniques, the aquifer storage and recovery (ASR) is a well-known sub-surface technique to replenish depleted aquifers, which is contingent upon the selection of appropriate sites. This paper explores the potential of ASR for groundwater recharge in the hydrological, hydrogeological, social, and economic context of South Bihar in India. Based on the water samples from more than 137 wells and socio-economic surveys, ASR installations were piloted through seven selected entrepreneurial farmers in two villages of South Bihar. The feasibility of ASR in both hard rock and deep alluvial aquifers was demonstrated for the prominent aquifer types in the marginal alluvial plains of South Bihar and elsewhere. It was postulated through this pilot study that a successful spread of ASR in South Bihar can augment usable water resources for agriculture during the winter cropping season. More importantly, ASR can adapt to local circumstances and challenges under changing climatic conditions. The flexible and participatory approach in this pilot study also allowed the farmers to creatively engage with the design and governance aspects of the recharge pit. The entrepreneurial farmers-led model builds local accountability, creates avenues for private investments, and opens up the space for continued innovation in technology and management, while also committing to resource distributive justice and environmental sustainability.

scholarly journals Investigation on the Surface Quality Obtained during Trochoidal Milling of 6082 Aluminum Alloy

Machines ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 75
Author(s):  
Nikolaos E. Karkalos ◽  
Panagiotis Karmiris-Obratański ◽  
Szymon Kurpiel ◽  
Krzysztof Zagórski ◽  
Angelos P. Markopoulos
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Process Parameters ◽  
Manufacturing Industry ◽  
High Surface ◽  
Cutting Tools ◽  
Cutting Speed ◽  
Depth Of Cut ◽  
High Surface Quality ◽  
Trochoidal Milling

Surface quality has always been an important goal in the manufacturing industry, as it is not only related to the achievement of appropriate geometrical tolerances but also plays an important role in the tribological behavior of the surface as well as its resistance to fatigue and corrosion. Usually, in order to achieve sufficiently high surface quality, process parameters, such as cutting speed and feed, are regulated or special types of cutting tools are used. In the present work, an alternative strategy for slot milling is adopted, namely, trochoidal milling, which employs a more complex trajectory for the cutting tool. Two series of experiments were initially conducted with traditional and trochoidal milling under various feed and cutting speed values in order to evaluate the capabilities of trochoidal milling. The findings showed a clear difference between the two milling strategies, and it was shown that the trochoidal milling strategy is able to provide superior surface quality when the appropriate process parameters are also chosen. Finally, the effect of the depth of cut, coolant and trochoidal stepover on surface roughness during trochoidal milling was also investigated, and it was found that lower depths of cut, the use of coolant and low values of trochoidal stepover can lead to a considerable decrease in surface roughness.

The Effect of Oxygen Addition on Oxidation Resistance and Cutting Performance of Si3N4 Ceramics

2007 ◽  
Vol 534-536 ◽  
pp. 1089-1092
Author(s):  
Mituyoshi Nagano ◽  
Hideaki Sano ◽  
Shigeya Sakaguchi ◽  
Guo Bin Zheng ◽  
Yasuo Uchiyama
Keyword(s):  
Bending Strength ◽  
Cutting Tools ◽  
Cutting Performance ◽  
Al2o3 Content ◽  
High Wear Resistance ◽  
Composition Analysis ◽  
Performance Improvements ◽  
Oxygen Addition ◽  
Effect Of Oxygen ◽  
Si3n4 Ceramics

The effect of oxygen addition on oxidation behavior of the β-Si3N4 ceramics with 5 mass% Y2O3 and 2 or 4 mass% Al2O3 was investigated by performing oxidation tests in air at 1300° to 1400°C and cutting performance tests. These tests were intended to clarify their ware resistance as cutting tools. The results of mass change, SEM observation and composition analysis of the specimens before and after oxidation test showed that as the Al2O3 content in the β-Si3N4 ceramics increased, mass changes resulted higher oxidation during which process pores and cracks formed due to the release of N2 gas. The values of hardness and bending strength of the specimens with relatively small amount of 2 mass% Al2O3, which formed solid solution in the Si3N4 structure [Si6-zAlzOzN8-z (z = 0.1)], showed larger than those of the specimen with 4 mass% Al2O3 (z = 0.2). The specimens group added with Al2O3 of 2 mass% (Z = 0.1) also showed high wear resistance. From this, we could conclude that the mechanical properties of β-Si3N4 ceramics depending on oxygen introduction is much effective on cutting performance improvements of the cutting performance of β-Si3N4 ceramics.

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