scholarly journals Vat Photopolymerization of Cemented Carbide Specimen

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7631
Author(s):  
Thomas Rieger ◽  
Tim Schubert ◽  
Julian Schurr ◽  
Andreas Kopp ◽  
Michael Schwenkel ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Size Range ◽  
Linear Shrinkage ◽  
Cemented Carbide ◽  
High Porosity ◽  
Near Net Shape ◽  
Metal Cutting Tool ◽  
Porosity Fraction

Numerous studies show that vat photopolymerization enables near-net-shape printing of ceramics and plastics with complex geometries. In this study, vat photopolymerization was investigated for cemented carbide specimens. Custom-developed photosensitive WC-12 Co (wt%) slurries were used for printing green bodies. The samples were examined for defects using quantitative microstructure analysis. A thermogravimetric analysis was performed to develop a debinding program for the green bodies. After sintering, the microstructure and surface roughness were evaluated. As mechanical parameters, Vickers hardness and Palmqvist fracture toughness were considered. A linear shrinkage of 26–27% was determined. The remaining porosity fraction was 9.0%. No free graphite formation, and almost no η-phase formation occurred. WC grain growth was observed. 76% of the WC grains measured were in the suitable size range for metal cutting tool applications. A hardness of 1157 HV10 and a Palmqvist fracture toughness of 12 MPam was achieved. The achieved microstructure exhibits a high porosity fraction and local cracks. As a result, vat photopolymerization can become an alternative forming method for cemented carbide components if the amount of residual porosity and defects can be reduced.

scholarly journals SYSTEM FOR CONTROLLING MASS BALANCE OF GASES AND REAGENTS DURING FORMATION OF ION-PLASMA COATINGS

2020 ◽  
pp. 67-75
Author(s):  
K. V. Diadiun
Keyword(s):  
Mass Balance ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Tool Material ◽  
Automated System ◽  
Effective Control ◽  
Ion Plasma ◽  
Physical Deposition ◽  
Plasma Coatings ◽  
Metal Cutting Tool

Providing an increase in the working capacity of a metal-cutting tool, it is possible to significantly increase the productivity of mechanized labor, thereby reducing the cost of purchasing a new tool and saving on other accompanying technological components. During the operation of the cutting tool, the main load is transferred to its working part, this, as a rule, leads to partial wear or complete destruction of the planes and cutting edges. There are a number of technologies for processing working surfaces, which provides them with additional strengthening, the most effective of which is the method of applying special coatings to the surface of the cutting tool. Taking into account the specifics of the processes of formation of coatings, they can be divided into three main groups [1]. The first group includes methods in which the formation of coatings is carried out mainly due to diffusion reactions between saturating elements and structures of the instrumental material. The second group includes methods of forming coatings by a complex mechanism. The third group includes methods of forming coatings due to chemical and plasma-chemical reactions of particle flux simultaneously in volumes of space immediately adjacent to the saturable surfaces of the instrumental base. One such technology is the CIB (condensation and ion bombardment) method, which is a physical deposition of coatings. The most characteristic feature of coatings produced by this method is the absence of a transition zone between the coating and the tool material. This makes it possible to obtain a complex of properties on the working surfaces of the tool without deteriorating its original properties. The article is devoted to the issues of increasing the efficiency of ion-plasma technologies through the development and implementation of an automated system for analyzing and controlling the mass balance of reagent gases under conditions of several gases supply. Thus, the improvement of the technology of coating the working surfaces of the cutting tool, namely, the effective control of the process of applying ion-plasma coatings with the introduction of an automated system for analyzing and controlling the mass balance of reagent gases under conditions of supplying several gases is an urgent task.

scholarly journals The influence of hydrojet surface processing on the adhesive strength of wear-resistant coatings deposited on a metal-cutting tool of oxynitride ceramics

2018 ◽  
Vol 224 ◽  
pp. 01066
Author(s):  
Anton Seleznev ◽  
Anton Smirnov ◽  
Pavel Peretyagin
Keyword(s):  
Metal Cutting ◽  
Cutting Tool ◽  
Surface Defects ◽  
New Approach ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Cutting Ceramics ◽  
Nitride Ceramics ◽  
Cutting Inserts ◽  
Metal Cutting Tool

The work represents a new approach of preliminary surface treatment of replaceable polyhedral cutting ceramics inserts for significant increase of adhesion strength with deposited wear-resistant nitride ceramics. By this method the hydrojet treatment was used to repair surface defects occurring during manufacturing process of any required geometry of cutting inserts.

scholarly journals Construction of a specialized control system for brush machine and rounding the cutting edges of a metal cutting tool

2019 ◽  
Vol 298 ◽  
pp. 00064
Author(s):  
Petr Nikishechkin ◽  
Nikita Grigoriev ◽  
Nadezhda Chervonnova
Keyword(s):  
Control System ◽  
Metal Cutting ◽  
Structural Model ◽  
Cutting Tool ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Machine Control ◽  
Metal Cutting Tool

The basic aspects of preparing a cutting tool for applying wear-resistant coatings to it, in particular, the use of brush technology to round its cutting edges, are investigated. A structural model for constructing a specialized brush machine control system has been developed and the basic aspects of its development have been determined.

Soldering and cementation of hard-alloy metal cutting tool

1986 ◽  
Vol 22 (9) ◽  
pp. 421-423
Author(s):  
V. V. Du ◽  
M. L. Polyakova ◽  
V. I. Grebenev ◽  
V. P. Zhludov ◽  
V. A. Groshev ◽  
...  
Keyword(s):  
Hard Alloy ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Metal Cutting Tool ◽  
Alloy Metal

Stress Distribution in a Wedge for Boundary Conditions Approximating to the Rake-Face Loads on a Metal Cutting Tool

1973 ◽  
Vol 15 (3) ◽  
pp. 200-209 ◽  
Author(s):  
P. F. Thomason
Keyword(s):  
Stress Distribution ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Contact Length ◽  
Rake Face ◽  
Line Field ◽  
Tangential Stresses ◽  
Detailed Assessment ◽  
Metal Cutting Tool ◽  
Infinite Wedge

An analysis of published experimental and theoretical slip-line field results for the metal cutting process suggests that, when the tool and workpiece are of high elastic modulus, a reasonable first approximation to the rake-face loading will consist of uniformly distributed normal and tangential stresses over the contact length. An indication of the form of the stress distribution at the tip of a cutting tool is therefore obtained from an isothermal–elastic solution for a two-dimensional infinite wedge, loaded antisymmetrically by uniform normal and tangential stresses adjacent to the apex. Only a preliminary assessment of the results is made, in relation to cutting tool wear and fracture problems, since a more detailed assessment will await a complete thermoelastic solution to the problem.

Transient Thermal Stresses in the Quarter-Plane and their Relation to the Thermal-Cracking of Cutting Tools

1974 ◽  
Vol 16 (5) ◽  
pp. 322-330
Author(s):  
P. F. Thomason
Keyword(s):  
Metal Cutting ◽  
Thermal Stresses ◽  
Cutting Tool ◽  
Crack Nucleation ◽  
Cutting Tools ◽  
Thermal Cracking ◽  
Quarter Plane ◽  
Metal Cutting Tool ◽  
Transient Thermal ◽  
Cemented Carbide Tools

The transient thermal stresses in an insulated quarter-plane, subject to an instantaneous heat source on a segment of the surface, are determined with the aid of the Green's function for a two-dimensional infinite space. Numerical results for the transient thermal stresses at the surfaces of the quarter-plane are superimposed on previous isothermal results for cutting-load stresses in a π/2 wedge, to provide a model for a metal-cutting tool in the transient stages of a cutting process. The results are related to the problem of the thermal-cracking of cutting tools, and mechanisms of crack nucleation and propagation are proposed for both ceramic and cemented-carbide tools.

Methods of Forecasting Wear Resistance of Cutting Tools Based on the Properties of their Materials

2014 ◽  
Vol 682 ◽  
pp. 491-494 ◽  
Author(s):  
Vladislav Bibik ◽  
Elena Petrova
Keyword(s):  
Tool Life ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Chemical Properties ◽  
Tool Material ◽  
Composition Structure ◽  
Metal Cutting Tool ◽  
Physical And Chemical ◽  
Thermo Physical Properties

The author considers methods of forecasting metal-cutting tool life based on characteristics of cutting tool material. These characteristics depend on differences in numerical values of physical and chemical properties of tool material due to changes in its composition, structure, and production process variables. The described methods allow obtaining the information necessary for forecasting the tool life beyond the process of cutting, for example at the stage of cutting tool manufacturing. The author suggests using the method of registration of thermo-physical properties of the tool material as a promising forecasting technique.

scholarly journals Predicting the Durability Period of a Metal Cutting Tool Based on a Neural Network

2020 ◽  
Vol 18 (3) ◽  
pp. 95
Author(s):  
A. V. Korobeynikov ◽  
A. F. Mkrtchyan ◽  
V. V. Sitnikov ◽  
A. V. Nagovitsyn
Keyword(s):  
Neural Network ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Metal Cutting Tool

Рассматривается задача прогнозирования периода стойкости металлорежущего инструмента при заданных параметрах режима резания. Для решения поставленной задачи предлагается использовать нейросетевую модель. Предложено использовать в качестве структуры нейронной сети многослойный персептрон. Обучающей выборкой при обучении нейросетевой модели прогнозирования служат накопленные статистические данные системы «Инструментальный шкаф». Входными данными нейронной сети служат значения параметров режима резания (тип материала заготовки, значение глубины резания при технологической операции, значение подачи при технологической операции, значение скорости резания) и значения параметров конструкции металлорежущей пластины, указанных в маркировке пластины согласно ISO 1832-85. Программная реализация предложенной нейронной сети выполнена с использованием библиотеки машинного обучения «DeepLearning4J».При обучении нейронной сети формировалось 5 обучающих подвыборок, содержащих по 20 % от количества образцов в обучающей выборке. Для решения проблемы переобучения нейронной сети использовался метод перекрестной проверки. Использовалась обучающая выборка общим количеством 500 записей по множеству металлорежущего инструмента, состоящему из 10 пластин. Проведенные эксперименты показали работоспособность предложенного подхода. В работе представлены графики, показывающие зависимость прогнозируемого периода стойкости от одного из параметров режима резания.Цель работы заключается в повышении эффективности планирования закупок металлорежущего инструмента.

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