Investigation of Conditions of Processing Influence on Micro-Hardness Distribution in Surface Layer during Diamond Burnishing of Samples of FeC0.15Cr12Ni2 Steel

2017 ◽  
Vol 746 ◽  
pp. 290-295 ◽  
Author(s):  
Aleksei Nicolaevich Shvetcov ◽  
Dmitrii Leonidovich Skuratov
Keyword(s):  
Experimental Investigation ◽  
Plastic Deformation ◽  
Surface Layer ◽  
Hardened Layer ◽  
Process Conditions ◽  
Hardness Distribution ◽  
Micro Hardness ◽  
Layer Depth ◽  
Burnishing Process ◽  
Diamond Burnishing

The article shows the results of experimental investigation influence of process conditions on parameters, defining plastic deformation, during diamond burnishing process: maximum of micro-hardness and depth of hardened layer (depth of workhardening). Empirical dependences, linking the maximum of micro-hardness and depth of workhardening to the diamond burnishing process parameters, were obtained on the base of the experimental investigation.

scholarly journals Experimental and Numerical Analysis of the Depth of the Strengthened Layer on Shafts Resulting from Roller Burnishing with Roller Braking Moment

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5844
Author(s):  
Marek Kowalik ◽  
Tomasz Trzepieciński ◽  
Leon Kukiełka ◽  
Piotr Paszta ◽  
Paweł Maciąg ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Surface Layer ◽  
Rolling Resistance ◽  
Original Method ◽  
Pressure Force ◽  
Roller Burnishing ◽  
Braking Torque ◽  
Burnishing Process ◽  
Deformed Layer ◽  
Dependence Relationship

The article presents the results of investigations into the depth of the plastically deformed surface layer in the roller burnishing process. The investigation was carried out in order to obtain information on the dependence relationship between the depth of plastic deformation, the pressure on the roller and the braking torque. The research was carried out according to the original method developed by the authors, in which the depth of plastic deformation is increased by applying a braking torque to the burnishing roller. In this method, it is possible to significantly increase (up to 20%) the depth of plastic deformation of the surface layer. The tests were carried out on a specially designed device on which the braking torque can be set and the force of the rolling resistance of the roller during burnishing can be measured. The tests were carried out on specimens made of C45 heat-treatable carbon steel. The dependence of the depth of the plastically deformed surface layer was determined for a given pressure force and variable braking moments. The depth of the plastically deformed layer was measured on the deformed end face of the ring-shaped samples. The microhardness in the sample cross-section and the evolution of the microstructure were both analysed.

Experimental Investigation on the Nickel-Based Metal Components Fabricated by Laser Cladding

2008 ◽  
Vol 375-376 ◽  
pp. 338-342 ◽  
Author(s):  
Xia Ji ◽  
Jian Zhong Zhou ◽  
Hua Feng Guo ◽  
Da Peng Xu
Keyword(s):  
Experimental Investigation ◽  
Laser Cladding ◽  
Orthogonal Design ◽  
Hardness Measurement ◽  
Processing Parameters ◽  
Process Conditions ◽  
Micro Hardness ◽  
Hardness Tester ◽  
Cladding Layer ◽  
Powder Feed

This paper presents an experimental investigation on the metal components fabricated by laser cladding. In the present study, two process of laser cladding were conducted, that is pre-placed powder cladding and coaxial powder-feed cladding. The effect of processing parameters was studied and optimum set of parameters for the superior surface quality was established by employing the orthogonal design. The fabricated components were subjected to metallographic examinations and micro-hardness measurement. Results indicated that the microstructure of coaxial cladding components was finer than pre-placed powder cladding components. The micro-hardness of the fabricated specimen along and vertical the scanning direction were measured using a HVS-1000 micro-hardness tester with a 200 g applied load. Analysis of the physical properties provided further evidence of differences in micro-hardness produced by different process conditions, and the average micro-hardness value of pre-placed power cladding layer was lower than the coaxial powder-feed cladding layer.

scholarly journals JUSTIFICATION OF APPLICATION MODES OF MACHINING ATTACHMENTS FOR PROCESSING PARTS BY THE METHOD OF PLASTIC DEFORMATION

2021 ◽  
pp. 136-141
Author(s):  
Д.Г. ЧУРИЛОВ ◽  
И.С. АРАПОВ ◽  
А.В. СТАРУНСКИЙ ◽  
С.Д. ПОЛИЩУК
Keyword(s):  
Plastic Deformation ◽  
Surface Layer ◽  
Economic Effect ◽  
Inertial Force ◽  
Quality Parameters ◽  
Surface Plastic ◽  
Technical Problems ◽  
Wide Range ◽  
Diamond Burnishing

Проблема и цель. Установлено, что функциональное действие машин в значительной мере определяется параметрами качества их поверхностного слоя. Цель работы – обеспечение качества поверхностного слоя деталей одним из наиболее эффективных способов, обеспечивающих управление в широком диапазоне показателями качества обработки деталей поверхностным пластическим деформированием (ОУО ППД). Одни и те же параметры качества поверхностного слоя можно получить, используя различные методы и режимы ОУО ППД. Для их оценки необходимо определение трудоемкости операции. Следовательно, имеет место совокупность научно-технических задач, решение которых позволяет разработать методологию, алгоритм и программу выбора оптимального метода и условий ОУО ППД, обеспечивающих требуемые параметры качества поверхности при минимальной технологической себестоимости, что дает значительный экономический эффект. Методология. Одним из способов обработки деталей при восстановлении служит алмазное выглаживание после процесса шлифования. Выглаживатель – кристаллический алмаз – перераспределят металл поверхностного слоя, при этом меняется микрорельеф. После алмазного выглаживания увеличивается надежность, долговечность деталей, износостойкость. Для достижения цели предлагается использование двухзвенных оправок, которые позволяют исключить биение обрабатываемой поверхности. Структурный эквивалент механизма близок к кривошипно-шатунному механизму, в отличие от которого радиус обрабатываемой детали распределяется по дуге. Изменения силы выглаживания устанавливают связь между статической силой и силой инерции. Статическую силу сглаживания можно определить, зная основные технологические параметры и процессы. Сила инерции зависит от массы подвижного звена оправки. Результаты. Результаты настоящего исследования показали: к числу задаваемых параметров относятся масса подвижного звена оправки, диаметр детали, скорость скольжения, эксцентриситет, постоянная механизма и сила инерции. Найдены разрешенные частоты вращения в зависимости от диаметра детали. Заключение. Данная методика может быть применена для восстановления рабочих поверхностей поршневых пальцев автотракторных дизельных двигателей сельскохозяйственного назначения и позволяет снизить уровень шероховатости поверхности обрабатываемых деталей. Problem and purpose. Problem and purpose. It has been established that the functional action of machines is largely determined by the quality parameters of their surface layer. The purpose of the work is to ensure the quality of the surface layer of parts by one of the most effective methods that provides control over a wide range of quality indicators for processing parts by surface plastic deformation (SPD). The same parameters of the quality of the surface layer can be obtained using different methods and modes of SPD. To assess them, it is necessary to determine the complexity of the operation. Consequently, there is a set of scientific and technical problems, the solution of which makes it possible to develop a methodology, an algorithm and a program for choosing the optimal method and conditions for SPD, which provide the required surface quality parameters at a minimum technological cost, that gives a significant economic effect. Methodology. One of the methods of processing parts during restoration is diamond burnishing after the grinding process. The smoother or the crystal diamond will redistribute the metal of the surface layer, thus changing the microrelief. After diamond burnishing, reliability, durability of parts, and wear resistance increase. To achieve the goal, it is proposed to use two-link mandrels, which allow to exclude the beating of the treated surface. The structural equivalent of the mechanism is close to the crank gear, in contrast to which the radius of the workpiece is distributed along the arc. Changes in the smoothing force establish a relationship between static force and inertial force. The static smoothing force can be determined by knowing the basic technological parameters and processes. The force of inertia depends on the mass of the moving link of the mandrel. Results. The results of this study showed that the parameters set included the mass of the movable link of the mandrel, the diameter of the part, the sliding speed, the eccentricity, the constant of the mechanism and the force of inertia. The permitted speeds were found depending on the diameter of the part. Conclusion. This technique can be used to restore the working surfaces of the piston pins of automotive diesel engines for agricultural purposes and can reduce the level of surface roughness of the processed parts

OUTLOOKS IN SURFACE PLASTIC DEFORMATION USE TO DECREASE SURFACE ROUGHNESS IN ROLLING MILL PARTS STRENGTHENED WITH SVS-ELECTRODE MATERIALS

2020 ◽  
Vol 2020 (8) ◽  
pp. 4-12
Author(s):  
Aleksey Makarov ◽  
Anna Titova ◽  
A. Afonin ◽  
Alexander Kudryashov ◽  
Aleksandr Vladimirov
Keyword(s):  
Surface Roughness ◽  
Plastic Deformation ◽  
Surface Layer ◽  
Rolling Mill ◽  
Mechanical Characteristics ◽  
Electrode Materials ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Electrospark Alloying ◽  
Micro Hardness

The purpose of this work consists in ensuring the required quality of micro-geometry and mechanical characteristics of a surface layer in rolling mill parts, in particular, surface roughness no more than Ra=2.5mkm and micro-hardness no less than 900 kgs/mm2. To ensure such micro-hardness in samples of 60HN steel there were applied coatings With the method of electrospark alloying with the use as an electrode synthetic hard tool materials based on titanium diboride (STIM-11) and titanium carbide (STIM-40NA) made by the method of self-propagating high-temperature synthesis. EIL-coatings made of thses materials are characterized with the thickness of 30mkm, micro-hardness up to 980 kgs/mm2, that exceeds four times micro-hardness of a non-hardened sample, and with roughness Ra=5…10mkm. To decrease roughness of EIL-coatings made of STIM materials for the first time there was used surface plastic deformation with smoothing that is a novelty of this investigation. Smoothing was carried out on a screw-cutting lathe with the aid of a flattener with TC6 tungsten-cobalt hard alloy indenter (r=6mm) at the rotational frequency n=70rev/min and at the indenter longitudinal feed S=0.05mm/rev and the smoothing force P=500N. As a result of smoothing the micro-hardness of surface layers made 990kgs/mm2, and roughness – Ra=1.6…1.8mkm. Conclusion: smoothing contributes to the decrease of surface layer roughness from 3 times (STIM-40NA) to 5.5 times (STIM-11) at the conservation of their mechanical characteristics that proves the outlook in use of such a technology for finishing parts surfaces strengthened with SVS-electrode materials by STIM method of electrospark alloying.

Experimental Research on Grinding Surface Layer Behavior and Process Parameter Optimization of Spiral Bevel Gears

2014 ◽  
Vol 936 ◽  
pp. 1707-1715
Author(s):  
Xing Zu Ming ◽  
Zhong Gun Li ◽  
Xian Wen Xiong ◽  
Jing Zhou
Keyword(s):  
Surface Roughness ◽  
Surface Layer ◽  
Residual Stresses ◽  
Grinding Process ◽  
Micro Hardness ◽  
Layer Depth ◽  
Spiral Bevel Gears ◽  
Bevel Gears ◽  
Layer Behavior ◽  
Spiral Bevel

Based on the test analyses of grinding surface layer behavior of spiral bevel gears, many conclusions are gotten. Compressive residual stresses are occurred on grinding tooth surface, tensile residual stresses are located in tooth layer, and change laws of grinding residual stresses are different from ones of grinding surface roughness Ra as the grinding process parameters. A temper layer is occurred in tooth layer after normal grinding, and the micro-hardness of grinding surface is lower. When arriving at the critical condition, namely grinding temperature is above 600 degree Celsius, and metamorphic layer depth is greater than 0.2mm, different degree of grinding burn is produced, and their microstructures are changed. Based on grinding orthogonal test L16(45), the optimizing configuration of grinding process parameters of spiral bevel gear is obtained by using a mean variance analysis of integrated balance method. Based on the test optimization of grinding surface layer behavior, the comprehensive performances of grinding surface, such as grinding residual stresses, surface roughness, micro-hardness and structure, metamorphic layer depth et al, are better. These provide a basis for improvement of grinding surface quality of spiral bevel gears.

Experimental Research on Grind-Hardening of 65Mn Steel

2006 ◽  
Vol 505-507 ◽  
pp. 787-792 ◽  
Author(s):  
Ju Dong Liu ◽  
Gui Cheng Wang ◽  
Zhi Wang ◽  
Shu Tian Fan
Keyword(s):  
Surface Modification ◽  
Hardened Layer ◽  
Depth Of Cut ◽  
Grinding Wheel ◽  
Micro Hardness ◽  
Layer Depth ◽  
Cooling Conditions ◽  
Dry Grinding ◽  
Grind Hardening ◽  
Grinding Technique

Grind-hardening was done on 65Mn steel with a conventional surface grinder and a corundum-grinding wheel. Research was conducted to probe into microstructures and properties of the hardened layer under varied depth of cut and cooling conditions. Results show that the hardened layer does not change noticeably in their martensitic structures and micro-hardness, which is ranged between 810-870HV. When the depth of cut increases or the dry grinding technique is adopted, the hardened layer becomes thicker accordingly. Under the condition of dry grinding with the depth of cut 1.0mm, the hardened layer depth reaches 2.0mm. It can find applications in grinding and metal surface modification field.

scholarly journals HETEROGENEOUS HARDENING OF MACHINES PARTS BY SURFACE PLASTIC DEFORMATION

2019 ◽  
pp. 106-112
Author(s):  
А. Афонин ◽  
A. Afonin ◽  
Е. Мартынов ◽  
E. Martynov ◽  
А.В. Макаров ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Surface Layer ◽  
Fatigue Loading ◽  
Hardened Layer ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Heterogeneous Structure ◽  
The Finite Element Method ◽  
Operational Characteristics ◽  
Machine Parts

The main causes of failure of heavily loaded threads are considered. The methods of increasing the efficiency of the equipment due to the method used are proposed. It is found that improving the operational characteristics of the components of mining and metallurgical machinery can be achieved forming heterogeneous-hardened surface layer. Methods of forming heterogeneous structure by surface plastic deformation (SPD are considered). The importance of identifying the nature of the influence of parameters of heterogeneous hardened layer on the performance of machine parts is indicated. Modeling of process heterogeneous hardening of SPD of the finite element method is executed. Recommendations about application of heterogeneous hardening of SPD for hardening the heavy-duty parts are offered. It is found that the use of different methods SPD allows widely vary the degree of depth and the uniformity of the hardening of machine parts. It is found that this increase in life responsible highly loaded parts operating under fatigue loading due to hardening of the heterogeneous surface layer may reach 1.5 times or more.

Mathematical Model and Program Development for the Efficient Process Conditions Determination during FeC0.15Cr12Ni2 Steel Diamond Smoothing

2016 ◽  
Vol 684 ◽  
pp. 477-482 ◽  
Author(s):  
Aleksei Nicolaevich Shvetcov ◽  
Dmitrii Leonidovich Skuratov
Keyword(s):  
Mathematical Model ◽  
Plastic Deformation ◽  
Surface Layer ◽  
Program Development ◽  
Synthetic Diamond ◽  
Process Conditions ◽  
Deformation Degree ◽  
Efficient Process ◽  
The Mathematical Model

In this paper the mathematical model and the program based on this model for efficient process conditions during a diamond smoothing is introduced. The mathematical model has been tested with heatproof martensite category steel FeC0.15Cr12Ni2 by the synthetic diamond DSB-1 using as a smoothing tool. The mathematical model takes into account plastic deformation degree which could have both smoothing and reinforcing nature. Through the smoothing conditions the surface has a microroughnesses crumpling but reinforcing conditions involve also surface layer microhardness increasing.

Effect of diamond burnishing parameters on the state of the processed surface layer of billets made of high-strength "30ХГСН2А-ВД" steel

2020 ◽  
pp. 82-86
Author(s):  
A.N. Shvetsov ◽  
D.L. Skuratov
Keyword(s):  
Surface Layer ◽  
Residual Stresses ◽  
Strain Hardening ◽  
Processing Speed ◽  
Synthetic Diamond ◽  
High Strength ◽  
The State ◽  
Diamond Burnishing

The influence of the burnishing force, tool radius, processing speed and feed on the distribution of circumferential and axial residual strses, microhardness and the depth of strain hardening in the surface layer when pr ssing of "30ХГСН2А-ВД" steel with synthetic diamond "ACB-1" is considered. Empirical dependencies determining these parameters are given. Keywords diamond burnishing, strain hardening depth, circumferential residual stresses, axial residual stresses, microhardness. [email protected], [email protected]

Plastic deformation of collector plates at electric motor repair

2020 ◽  
pp. 79-82
Author(s):  
D.YU. Belan ◽  
G.B. Toder ◽  
K.V. Averkov ◽  
YU.V. Titov
Keyword(s):  
Plastic Deformation ◽  
Electric Motor ◽  
Roughness Parameter ◽  
Surface Plastic Deformation ◽  
Analytical Dependence ◽  
Surface Plastic ◽  
Machined Surface ◽  
Tool Surface ◽  
Diamond Burnishing ◽  
Traction Electric Motor

A tool was developed for smoothing the plates of an electric motor collector. An analytical dependence of the roughness parameter of the machined surface on the force applied to the tool is obtained. Keywords traction electric motor, collector, diamond burnishing tool, surface-plastic deformation, repair, roughness. [email protected]

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