Fatigue strength of disk cutting tool of robotic equipment

2020 ◽  
pp. 58-62
Author(s):  
A.YU Karpachev ◽  
A.S. Voyakin
Keyword(s):  
Fatigue Strength ◽  
Cutting Tool ◽  
Rotation Frequency ◽  
Inertial Forces ◽  
Disk Model ◽  
Spatial Rotation ◽  
Circular Saw ◽  
Disc Rotation ◽  
Spherical Motion

The spatial rotation of the robotic unit cutting disk model is considered. The connection between the stresses in the disk and the kinematics of spherical motion is established. A criterion for the fatigue strength of a disk of robotic equipment is proposed. Keywords circular saw, disc, rotation frequency, inertial forces. [email protected]

scholarly journals High-Efficiency Small Sample Microparticle Fractionation on a Femtosecond Laser-Machined Microfluidic Disc

Micromachines ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 151
Author(s):  
Ala’aldeen Al-Halhouli ◽  
Zaid Doofesh ◽  
Ahmed Albagdady ◽  
Andreas Dietzel
Keyword(s):  
Laser Ablation ◽  
Femtosecond Laser ◽  
High Efficiency ◽  
Femtosecond Laser Ablation ◽  
Small Sample ◽  
Inertial Forces ◽  
Inertial Focusing ◽  
Coriolis Forces ◽  
Disc Rotation ◽  
First Time

The fabrication and testing of microfluidic spinning compact discs with embedded trapezoidal microchambers for the purpose of inertial microparticle focusing is reported in this article. Microparticle focusing channels require small features that cannot be easily fabricated in acrylic sheets and are complicated to realize in glass by traditional lithography techniques; therefore, the fabrication of microfluidic discs with femtosecond laser ablation is reported for the first time in this paper. It could be demonstrated that high-efficiency inertial focusing of 5 and 10 µm particles is achieved in a channel with trapezoidal microchambers regardless of the direction of disc rotation, which correlates to the dominance of inertial forces over Coriolis forces. To achieve the highest throughput possible, the suspension concentration was increased from 0.001% (w/v) to 0.005% (w/v). The focusing efficiency was 98.7% for the 10 µm particles and 93.75% for the 5 µm particles.

scholarly journals Diagnostics of Breakdown of Cutting Tools of Axial Cutting Head of the П110-04 Type Heading Machine

2017 ◽  
Vol 25 (2) ◽  
pp. 93-96
Author(s):  
О. Е. Shabaev ◽  
I. I. Bridun ◽  
О. К. Moroz
Keyword(s):  
Real Time ◽  
Spectral Decomposition ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Rotation Frequency ◽  
Head Rotation ◽  
Real Time Mode ◽  
Cutting Head ◽  
Machine Element ◽  
Cutting Unit

Abstract The operation of a heading machine with an out-of-work cutting tool can cause essential reduction of the machine element resource. The diagnostics of the cutting tool breakdown on the longitudinal axial cutting head in the real - time mode can be implemented on the basis of the spectral decomposition of the current of the cutting engine of the cutting unit. The ratio of the coefficients of the spectral decomposition corresponding to the cutting head rotation frequency and its threefold value can be the parameter under the diagnosis.

scholarly journals Method of drilling process control and experimental studies of resistance forces during bits drilling with PDC cutters

2020 ◽  
Vol 245 ◽  
pp. 539-546
Author(s):  
Vyacheslav Neskromnykh ◽  
Marina Popova ◽  
A. Golovchenko ◽  
P. PETENEV ◽  
Liu Baochang
Keyword(s):  
Cutting Tool ◽  
Cutting Tools ◽  
Experimental Studies ◽  
Rotation Frequency ◽  
Rock Cutting ◽  
Rock Failure ◽  
Drilling Process ◽  
Drilling Mud ◽  
Cost Of Time ◽  
The Cost

A rational, theoretically proved and empirically verified control system is a condition for optimal management of the drilling process in compliance with the criteria for minimizing the cost of time and material resources. A new generation of rock-cutting tools using PDC cutters (polycrystalline diamante cutters), which are extremely effective when drilling wells for various purposes in medium-hard rocks, dictates the need to develop methods and criteria for optimal control of the drilling process using this tool. The paper presents an analysis of the force interaction between rock-cutting elements, face rock, and drilling mud saturated with slam, highlights the influencing factors and provides dependencies for determining the parameters of rock failure. Empirical verification of the theoretical propositions was carried out based on the data analysis from experimental bit drilling of marble with PDC cutters with a diameter of 76.2 mm, processed using the method of full factor experiment to obtain mathematical models of factors and their graphical interpretation. The method of controlling the drilling process based on the optimal ratio of the tool rotation frequency, axial weight and deepening per one turnover is considered, which allows determining the rock failure mode at the well bottom by indirect signs and choose the optimal values of the drilling mode parameters that correspond to the most optimal conditions in terms of achieving the maximum mechanical drilling speed in conjunction with the rational mode of rock-cutting tool operation. A scheme is presented that contains possible variants of the bit run mode and ways to recognize them by the ratio of the deepening per turnover and the rotation frequency of the rock-cutting tool.

scholarly journals EXPERIMENTAL INVESTIGATIONS ON THE SURFACE APPLICATION OF SUPERPHOSPHATE BY THE FERTILISER SPREADING TOOL WITH INCLINED AXIS

2021 ◽  
pp. 307-316
Author(s):  
Volodymyr Bulgakov ◽  
Oleg Adamchuk ◽  
Semjons Ivanovs ◽  
Juri Olt
Keyword(s):  
Horizontal Plane ◽  
Rotation Frequency ◽  
Experimental Investigations ◽  
Experimental Setup ◽  
Surface Application ◽  
Axis Of Rotation ◽  
Disc Rotation

One of the possible ways to significantly increase the spreading distance of fertilisers (and, accordingly, efficiency) by the fertiliser spreading tools may be creation of a structure with an inclined axis of rotation. For experimental investigations an experimental setup was developed and a solid mineral superphosphate granular fertiliser was used as a material. Increasing the angle of inclination of the disc of the fertiliser sowing tool with an inclined axis in a horizontal plane from 0 to 30º at a disc rotation frequency of 1000 min-1 leads to an increase in the effective sieving distance of granulated superphosphate by 34.9. It has been established that the best indices of mineral fertilisation both in terms of the operating width and the irregularity of the fertiliser introduction are provided at the angles of inclination of the disc of the new fertiliser distributing tool in a horizontal plane within 25-30º.

The Chatterbox: A Device for Hearing Chatter as Sections are Cut

1973 ◽  
Vol 31 ◽  
pp. 360-361
Author(s):  
C. W. McCutchen ◽  
Lois W. Tice
Keyword(s):  
Machine Tools ◽  
Cutting Tool ◽  
Guerilla Warfare ◽  
History Of ◽  
Chatter Marks

Ultramicrotomists live in a state of guerilla warfare with chatter. This situation is likely to be permanent. We can infer this from the history of machine tools. If set the wrong way for the particular combination of cutting tool and material, most if not all machine tools will chatter.In more than 100 years since machine tools became common, no one has evolved a practical recipe that guarantees avoiding chatter. Rather than follow some single very conservative rule to avoid chatter in all cases, machinists detect it when it happens, and change conditions until it stops. This is possible because they have no trouble telling when their cutting tool is chattering. They can see chatter marks, and they can also hear a sometimes deafening noise.

Dynamics of the processes in metal machining

1998 ◽  
Vol 2 ◽  
pp. 115-122
Author(s):  
Donatas Švitra ◽  
Jolanta Janutėnienė
Keyword(s):  
High Frequency ◽  
Machine Tools ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Low Frequency ◽  
Metal Cutting Machine ◽  
Cutting Machine ◽  
Metal Machining

In the practice of processing of metals by cutting it is necessary to overcome the vibration of the cutting tool, the processed detail and units of the machine tool. These vibrations in many cases are an obstacle to increase the productivity and quality of treatment of details on metal-cutting machine tools. Vibration at cutting of metals is a very diverse phenomenon due to both it’s nature and the form of oscillatory motion. The most general classification of vibrations at cutting is a division them into forced vibration and autovibrations. The most difficult to remove and poorly investigated are the autovibrations, i.e. vibrations arising at the absence of external periodic forces. The autovibrations, stipulated by the process of cutting on metalcutting machine are of two types: the low-frequency autovibrations and high-frequency autovibrations. When the low-frequency autovibration there appear, the cutting process ought to be terminated and the cause of the vibrations eliminated. Otherwise, there is a danger of a break of both machine and tool. In the case of high-frequency vibration the machine operates apparently quiently, but the processed surface feature small-sized roughness. The frequency of autovibrations can reach 5000 Hz and more.

Sign in / Sign up

Export Citation Format

Share Document