Metrological Determination of Torque for Monitoring During Composite Drilling Process

2021 ◽  
Vol 396 (1) ◽  
pp. 2000325
Author(s):  
Claudiu Bisu ◽  
George Dinu ◽  
Miron Zapciu
Keyword(s):  
Drilling Process ◽  
Composite Drilling

Modeling the Vibratory Drilling Process

1999 ◽  
Author(s):  
Stephen A. Batzer ◽  
Alexander M. Gouskov ◽  
Sergey A. Voronov
Keyword(s):  
Rotational Velocity ◽  
Time Lag ◽  
Chip Thickness ◽  
Cutting Conditions ◽  
Model Parameters ◽  
Drilling Process ◽  
Workpiece Material ◽  
Velocity Amplitude ◽  
The Stability

Abstract The dynamic behavior of deep-hole vibratory drilling is analyzed. The mathematical model presented allows the determination of axial tool and workpiece displacements and cutting forces for significant dynamic system behavior such as the entrance of the cutting tool into workpiece material and exit. Model parameters include the actual rigidity of the tool and workpiece, time-varying chip thickness, time lag for chip formation due to tool rotation and possible disengagement of drill cutting edges from the workpiece due to tool and/or workpiece axial vibrations. The main features of this model are its nonlinearity and inclusion of time lag differential equations which require numeric solutions. The specific cutting conditions (feed, tool rotational velocity, amplitude and frequency of forced vibrations) necessary to obtain discontinuous chips and reliable removal are determined. The stability conditions of excited vibrations are also investigated. Calculated bifurcation diagrams make it possible to derive the domain of system parameters along with the determination of optimal cutting conditions.

scholarly journals A Study on Drilling Process Control by Intelligent Machine Tools. (1st Report). Determination of Cutting Condition for Drilling.

2000 ◽  
Vol 66 (8) ◽  
pp. 1270-1274 ◽  
Author(s):  
Tomonori SATI ◽  
Yoshiaki KAKINO ◽  
Atsushi MATSUBARA ◽  
Makoto FUJISHIMA ◽  
Isao NISHIURA ◽  
...  
Keyword(s):  
Process Control ◽  
Machine Tools ◽  
Cutting Condition ◽  
Drilling Process ◽  
Intelligent Machine

Determination of sealing depth of in-seam boreholes for seam gas drainage based on drilling process of a drifter

2016 ◽  
Vol 210 ◽  
pp. 115-123 ◽  
Author(s):  
Kai Zhang ◽  
Kai Sun ◽  
Bangyong Yu ◽  
Ranjith Pathegama Gamage
Keyword(s):  
Drilling Process ◽  
Gas Drainage

Simulative Estimation of Reaction Force and Drill Accuracy of CFRP Composites

2020 ◽  
Vol 978 ◽  
pp. 344-350
Author(s):  
Dannana Dimple ◽  
Prashant Elango ◽  
Marimuthu K. Prakash
Keyword(s):  
Reaction Force ◽  
Three Dimensional ◽  
Strain Analysis ◽  
Failure Criteria ◽  
Theoretical Explanation ◽  
Drilling Process ◽  
Composite Damage ◽  
Element Simulation ◽  
Drilling Simulation ◽  
Composite Drilling

The present work deals with the finite element simulation of drilling of fibre-reinforced composites. The simulation is done using commercially available software. Hashin failure criteria has been used to simulate the drilling process. Three dimensional drill model was created and Hashin failure is defined via VUMAT sub-routine. Three-dimensional Hashin failure have larger stress and strain analysis resolution. This research is focused on validating reaction force and accuracy of drill. Reaction force obtained in composite drilling simulation is compared with experimental data. The work is focused on reproducing the simulation of composite modelling and composite damage rather than theoretical explanation of composite material and mathematical model behind the simulation. Thus, laying the knowledge to simulate composite fibres failure.

Determination of the Optimal Path of Three Axes Robot Using Genetic Algorithm

2019 ◽  
Vol 44 ◽  
pp. 135-149
Author(s):  
Sid Ahmed Dahmane ◽  
Abdelkader Megueni ◽  
Abdelwahab Azzedine ◽  
Abdelkader Slimane ◽  
Abdelkader Lousdad
Keyword(s):  
Optimal Path ◽  
Cutting Tools ◽  
Machining Process ◽  
Work Piece ◽  
Drilling Process ◽  
Genetic Optimization ◽  
Machining Time ◽  
Planning And Scheduling ◽  
Cylindrical Holes

Drilling is a chip machining process widely used in manufacturing .The term drilling includes all methods for making cylindrical holes in a work piece with chip cutting tools. There are many applications where drilling is used, such as drilling holes in PCBs. Robotic systems are used today to perform the drilling process. A problem that affects the use of these systems is the drilling sequence, as there are usually a number of points to visit. The determination of the drilling sequence is similar to the problem of synchronization of movement and travel time. The main objective is to optimize the time and trajectory of the three axes robot equipped with an automatic drill that seeks the best performance. In this paper, we have built a genetic optimization and problem solving algorithms to shorten the machining time to drill a given group of holes and reduce machining costs in order to improve the efficiency of the machining process as well robotic machining with three axes without degradation of the precision of the movement. The results of the experiments show that the proposed approach is feasible and practical. It is particularly useful in planning and scheduling systems for real-time manufacturing processes.

scholarly journals Estimation of serpentinite rock mass strength of Placetas - Cuba underground gold mine deposit

2017 ◽  
Vol 2 (1) ◽  
Author(s):  
Adeoluwa O Oluwaseyi ◽  
Olawale O Ajibola
Keyword(s):  
Rock Mass ◽  
Technical Information ◽  
Geological Strength Index ◽  
Drilling Process ◽  
Gold Mine ◽  
Well Log ◽  
Strength Index ◽  
Global Strength ◽  
Type Of Failure

This study estimated the strength of the serpentinite rock mass of the underground gold mine “Oro Descanso” Placetas, Cuba. The rock mass was classified into its lithological group of massive, sheared serpentinite rocks and gabbros. The geo-technical information from the well log data obtained during drilling process (geological logs). The structural analysis was carried out through field observation and quantified by Geological Strength Index (GSI) of average values for massive serpentinite 60, sheared serpentinite 38 and gabbros 78. The generalized Hoek-Brown criterion with software programme, Rocklab 1.0, 2004 version was employed for the analysis and the determination of the rock mass local compressive strength (massive serpentinite = 1.733Mpa; sheared serpentinite = 0.464Mpa; gabbros = 10.354Mpa) and the global strength (massive serpentinite = 6.561Mpa, sheared serpentinite = 5.657Mpa and gabbros = 22.547Mpa). These estimated values characterize brittle type of failure mode and thus supports are recommended.

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