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.

Development of Hard Rock Cutting Tool with Advanced Diamond Composites

2013 ◽  
Vol 690-693 ◽  
pp. 1831-1835 ◽  
Author(s):  
X.S. Li ◽  
Yong Sun
Keyword(s):  
Cutting Tool ◽  
Hard Rock ◽  
Tool Material ◽  
Rock Cutting ◽  
Rock Excavation ◽  
Diamond Composite ◽  
Normal Forces ◽  
Bonding Technology ◽  
Bottle Neck ◽  
Better Than

The modern mechanical excavation machines have enough power for cutting hard rock. The bottle neck which limits the use of machines for hard rock excavation is cutting tool. To cut hard and abrasive rock, CSIRO has been developing Super Material Abrasive Resistant Tools (SMART*CUT). SMART*CUT technology replaces the tungsten carbide (WC) tip of conventional pick with thermally stable diamond composite (TSDC) and attaches the TSDC tip to steel tool body with CSIRO worldwide patented bonding technology. This paper compares its performance with conventional WC tipped tools by a series of hard rock cutting tests. The cutting and normal forces acting on the tools were measured during these tests. The tests shown that the cutting performance of SMART*CUT pick was significantly better than that of WC pick. The testing results indicate that TSDC can be applied as an effective cutting tool material for cutting hard and abrasive rocks.

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.

Accelerating the optimization of enzyme-catalyzed synthesis conditions via machine learning and reactivity descriptors

2021 ◽  
Author(s):  
Zhongyu Wan ◽  
Quan-De Wang ◽  
Dongchang Liu ◽  
Jinhu Liang
Keyword(s):  
Machine Learning ◽  
Optimal Synthesis ◽  
Human Knowledge ◽  
Crucial Importance ◽  
Reactivity Descriptors ◽  
Synthesis Conditions ◽  
Wide Range ◽  
Synthesis Reactions ◽  
Selection Of

Enzyme-catalyzed synthesis reactions are of crucial importance for a wide range of applications. An accurate and rapid selection of optimal synthesis conditions is crucial and challenging for both human knowledge...

Intonazione e significato: l’esempio dell’italiano regionale di Bergamo

2018 ◽  
Vol 69 (1) ◽  
pp. 35-55
Author(s):  
Giorgio Antonioli ◽  
Manuela Caterina Moroni
Keyword(s):  
Conversation Analysis ◽  
Empirical Data ◽  
Speech Act ◽  
Research Project ◽  
Preliminary Results ◽  
Form Function ◽  
Distinctive Type ◽  
Selection Of

Abstract In this paper we present a selection of preliminary results of our research project “Intonation and Meaning”, in which we compare recurrent intonation contours in German and Italian regional varieties. We apply the method of German Interactional Prosody Research (Interaktionale Prosodieforschung), which in turn is based on Conversation Analysis, to a sample of selfcollected empirical data. Our aim is to show the value of intonation as a resource to contextualize speech activities and to point out form-function relationships between intonation patterns and speech act types. In this respect, we observe the usage of intonation contours with rising accent (L*H) and with falling accent (H*L) in the utterance of question activities, and provide evidence for the fact that the latter represent a distinctive type of questions with epistemic presupposition, whereas L*H correlates rather with default, modally unmarked questions.

Suitability of Natural Geomedia for Radwaste Storage

1982 ◽  
Vol 15 ◽  
Author(s):  
W. S. Fyfe
Keyword(s):  
Rock Properties ◽  
Fracture Flow ◽  
Time Prediction ◽  
Sedimentary Sequences ◽  
Rock Types ◽  
Direct Observations ◽  
Long Time ◽  
Mining Disturbance ◽  
Selection Of

ABSTRACTSelection of the best rock types for radwaste disposal will depend on their having minimal permeability, maximal flow dispersion, minimal chance of forming new wide aperture fractures, maximal ion retention, and minimal thermal and mining disturbance. While no rock is perfect, thinly bedded complex sedimentary sequences may have good properties, either as repository rocks, or as cover to a repository.Long time prediction of such favorable properties of a rock at a given site may be best modelled from studies of in situ rock properties. Fracture flow, dispersion history, and geological stability can be derived from direct observations of rocks themselves, and can provide the parameters needed for convincing demonstration of repository security for appropriate times.

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