Secondary cutting edge wear of one-shot drill bit in drilling CFRP and its impact on hole quality

This paper describes an electronic-mechanical system which utilizes sonic signals to detect the degree of cutting edge wear in metalworking tools and automatically trigger a cutting edge change. A packaged electronic unit reads out sonic vibrations from an instrumented machine-tool workpiece cutting-tool system to determine degree of cutting edge wear during a turning cut. At a predetermined comparative sonic ratio, the electronic unit commands stoppage of the machine tool feed, retraction of the tool and automatic index of the cemented carbide insert to the next good cutting edge. The latter function is performed by a prototype mechanical device. The paper describes the system and cites data generated during use of the sonic detection system with five grades of cemented carbide cutting AISI 1045 steel. Results under varying cutting conditions are reported. The authors speculate on the possibility of combining such a wear detection and cutting edge indexing arrangement with a computer to provide a complete system for optimum productivity and economy in a completely automatic operation.

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Computation of End-Cutting-Edge Wear of Single-Point Cutting Tool Using Image Processing

Lecture Notes on Multidisciplinary Industrial Engineering - Advances in Computational Methods in Manufacturing ◽

10.1007/978-981-32-9072-3_53 ◽

2019 ◽

pp. 629-641 ◽

Cited By ~ 1

Author(s):

Vishal K. Singh ◽

Shrikrishna N. Joshi

Keyword(s):

Image Processing ◽

Cutting Tool ◽

Single Point ◽

Cutting Edge ◽

Edge Wear

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Reamers cutting edge preparation for improvement the GGG 40 machining

MATEC Web of Conferences ◽

10.1051/matecconf/201817801014 ◽

2018 ◽

Vol 178 ◽

pp. 01014

Author(s):

Ioan-Doru Voina ◽

Stefan Sattel ◽

Glad Contiu ◽

Adrian Faur ◽

Bogdan Luca

Keyword(s):

Wear Resistance ◽

Coating Layer ◽

Cutting Tools ◽

Cutting Edge ◽

Abrasive Jet Machining ◽

Edge Wear ◽

Solid Carbide ◽

Cutting Edge Preparation ◽

Machining Strategies ◽

Edge Preparation

The improvement of the microgeometry became a subject of a great interest in cutting tools optimization. This paper approaches the process of cutting edge preparation of solid carbide reamers. It has been analyzed the evolution of cutting edge wear resistance in the material GGG 40 using the scanning electron microscope (SEM). The work also compared the rounded cutting edge reamers realized using wet abrasive jet machining with standard unprepared cutting edge. To obtain different microgeometries were experienced a number of machining strategies, which resulted in four combinations of roundness and forms for the cutting edge. In order to validate the results, the author studied the wear resistance during the reaming tests, the influence of prepared surface of the cutting edge on metallic coating layer adhesion. The final purpose was to determinate the optimal strategy of cutting edge preparation considering the evolution of wear during the reaming process.

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A Mathematical Modeling to Predict the Cutting Forces in Microdrilling

Mathematical Problems in Engineering ◽

10.1155/2014/543298 ◽

2014 ◽

Vol 2014 ◽

pp. 1-11 ◽

Cited By ~ 5

Author(s):

Haoqiang Zhang ◽

Xibin Wang ◽

Siqin Pang

Keyword(s):

Mathematical Modeling ◽

Cutting Forces ◽

Chip Thickness ◽

Cutting Edge ◽

Force Model ◽

Cutting Mechanism ◽

Line Field ◽

Slip Line Field ◽

Cutting Model ◽

Secondary Cutting

In microdrilling, because of lower feed, the microdrill cutting edge radius is comparable to the chip thickness. The cutting edges therefore should be regarded as rounded edges, which results in a more complex cutting mechanism. Because of this, the macrodrilling thrust modeling is not suitable for microdrilling. In this paper, a mathematical modeling to predict microdrilling thrust is developed, and the geometric characteristics of microdrill were considered in force models. The thrust is modeled in three parts: major cutting edges, secondary cutting edge, and indentation zone. Based on slip-line field theory, the major cutting edges and secondary cutting edge are divided into elements, and the elemental forces are determined by an oblique cutting model and an orthogonal model, respectively. The thrust modeling of the major cutting edges and second cutting edge includes two different kinds of processes: shearing and ploughing. The indentation zone is modeled as a rigid wedge. The force model is verified by comparing the predicted forces and the measured cutting forces.

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Influence of bit geometry and cutting-edge wear on the design of a drilling machine with a differential link to the effector mechanisms

Soviet Mining Science ◽

10.1007/bf02501146 ◽

1975 ◽

Vol 11 (2) ◽

pp. 117-120

Author(s):

V. G. Sachkov

Keyword(s):

Cutting Edge ◽

Drilling Machine ◽

Edge Wear ◽

Effector Mechanisms

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The shape of a continuous cutting edge of a drill bit

Soviet Mining Science ◽

10.1007/bf02499311 ◽

1975 ◽

Vol 11 (4) ◽

pp. 435-437

Author(s):

B. A. Katanov ◽

A. G. Pimakov

Keyword(s):

Cutting Edge ◽

Drill Bit

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The accuracy of cutting edge wear measurement using a focus-variation microscope

Mechanik ◽

10.17814/mechanik.2018.10.141 ◽

2018 ◽

Vol 91 (10) ◽

pp. 850-852

Author(s):

Jan Burek ◽

Barbara Jamuła

Keyword(s):

Three Dimensional ◽

Cutting Edge ◽

Wear Measurement ◽

3D Geometry ◽

Edge Wear ◽

Focus Variation

An assessment of the accuracy of the reconstruction of cutting edges 3D geometry shank cutter depending on the magnification of the lens is presented. Focus-variation microscope Alicona G4 with IFM Alicona software were used in the research. The main goal of the research was to determine differences created in the process of the reconstruction of cutting edges geometry. Three-dimensional maps of deviation values were presented, using measurements of cutting edges geometry.

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Research on Impact Stress Transfer Characteristics of Lunar Rock Coring Drill

Shock and Vibration ◽

10.1155/2021/1555295 ◽

2021 ◽

Vol 2021 ◽

pp. 1-12

Author(s):

Peng Li ◽

Yizhuo Wang ◽

Bo Xu ◽

Junwei Liu ◽

Weiwei Zhang

Keyword(s):

Impact Energy ◽

Lunar Surface ◽

Cutting Edge ◽

Design Parameters ◽

Drill Bit ◽

Drilling Tool ◽

Drill Stem ◽

Impact Stress ◽

Transfer Characteristics ◽

The Impact

In the whole lunar surface drilling and sampling task, it is critical to make the operation of the drilling and sampling impact system efficient and reliable. This paper focuses on how to improve the impact stress obtained at the cutting edge of the drill bit. Firstly, with the objective of maximizing the output impact energy, the design parameters of the percussive mechanism are optimally selected; based on the one-dimensional stress wave transfer theory, the collision input model and transfer models of impact stress in the drilling tool are established. Secondly, in order to verify the above design parameters and theoretical models, the percussive drive characteristics’ test and the transfer characteristics’ tests of impact stress in the drill stem and drilling tool joints are carried out in turn. The experimental results are consistent with the theoretical analysis, which clarifies the transfer characteristics of the impact stress at the various stages of generation, incidence, and transfer to the cutting edge. It was finally found that increasing the percussive frequency and impact energy of the percussive mechanism as well as the contact stiffness of the collision surface can increase the incident impact stress of the drilling tool, while reducing the length of the screw connection between the drill bit and the drill stem can reduce the impact stress loss. This provides a theoretical reference for the design of the percussive mechanism and drilling tools in lunar surface drilling and sampling tasks.

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