scholarly journals Substantiation of parameters for the technological process of restoring machine parts by the method of plastic deformation

2019 ◽  
Vol 1 (1) ◽  
pp. 75-80
Author(s):  
Anatolii Dudnikov ◽  
Vladimir Dudnik ◽  
Olena Ivankova ◽  
Oleksii Burlaka
Keyword(s):  
Plastic Deformation ◽  
Technological Process ◽  
Machine Parts

New methods for surface plastic deformation of low-rigidity cylindrical machine parts

2018 ◽  
Vol 2018 (8) ◽  
pp. 16-24 ◽  
Author(s):  
Семен Зайдес ◽  
Semen Zaides
Keyword(s):  
Plastic Deformation ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
High Productivity ◽  
Surface Strengthening ◽  
New Methods ◽  
Machine Parts

Technological potentialities at finish-strengthening processing of low-rigid parts of shaft- and axle types with local ways of machining impact are rather limited. In the paper there are considered new ways for strengthening allowing obtaining qualitative surface strengthening in machine parts at high productivity of an engineering procedure.

Device for Wood-Cutting Tool Hardening

2021 ◽  
pp. 134-141
Author(s):  
Anatoly M. Buglaev ◽  
Keyword(s):  
Plastic Deformation ◽  
Surface Quality ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Labour Intensity ◽  
Machine Parts ◽  
Wood Cutting ◽  
Electrospark Hardening

Choosing effective methods and devices for surface hardening of wood-cutting tools is problematic due to the variety of their designs and operating conditions. In this regard, the development of such devices becomes an urgent task. According to the literature, one of the effective methods for increasing the service life of machine parts and tools is electrospark hardening or electrospark alloying. Industrial electrospark installations such as “EFI” (electrophysical measurements) and “Elitron” with manual vibrators are used for electrospark hardening. However, using manual vibrators significantly increases the labour intensity and hardening time. Moreover, the surface quality after hardening with manual vibrators is often unsatisfactory. Various mechanized installations have been developed in order to reduce the labour intensity of electrospark hardening. Nevertheless, these installations are designed to harden specific parts and do not allow hardening tools of various designs, including woodcutting tools. The surface quality after hardening in mechanized installations does not always satisfy the customer. Further surface plastic deformation treatments, such as rolling and unrolling with rollers and balls, as well as diamond burnishing, are often used to improve the surface quality after electrospark hardening. The surface quality after additional processing by these methods boosts, although the labour intensity and cost of the hardening process increase. To increase the wear resistance of machine parts and tools, it is reasonable to reduce the height parameters of roughness, increase microhardness, and form the residual compressive stresses, which is ensured by the methods of surface plastic deformation. In this regard, it becomes necessary to use electrospark hardening simultaneously with surface plastic deformation. The work presents the design and features of using the device for hardening. The device was used to strengthen the thicknesser machine knives, which made it possible to almost double their durability. Applying this device, in comparison with using the electrospark hardening with a manual vibrator, reduces the roughness of the hardened surface and improves the surface quality of the processed workpieces. The modes of hardening have been installed, making it possible to effectively harden wood-cutting tools. For citation: Buglaev A.M. Device for Wood-Cutting Tool Hardening. Lesnoy Zhurnal [Russian Forestry Journal], 2021, no. 5, pp. 134–141. DOI: 10.37482/0536-1036-2021-5-134-141

Investigating the Regularities of Surface Roughness Structuring while Processing with Surface Plastic Deformation for Calculation

2015 ◽  
Vol 756 ◽  
pp. 79-84
Author(s):  
Ivan Telkov
Keyword(s):  
Surface Roughness ◽  
Plastic Deformation ◽  
Technological Process ◽  
Surface Plastic Deformation ◽  
Design Stage ◽  
Surface Plastic ◽  
Operating Modes ◽  
Roughness Profile

This paper describes the regularities of structuring of surface roughness at surface plastic deformation in order to revise calculation of operating modes at the design stage of the technological process. The formula of roughness profile that allows calculating its general parameters has been obtained.

Validation of a FEM Model for the Simulation of the Cold Roll Forming Process

2015 ◽  
Vol 651-653 ◽  
pp. 219-224 ◽  
Author(s):  
Antonio Formisano ◽  
F. Capece Minutolo ◽  
Antonio Caraviello ◽  
Luigi Carrino ◽  
Massimo Durante ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Technological Process ◽  
Cross Section ◽  
Circular Cross Section ◽  
Roll Forming ◽  
Cold Roll Forming ◽  
Forming Process ◽  
Fem Model ◽  
Cold Roll ◽  
Roll Forming Process

Cold roll forming is a process for plastic deformation, which allows realizing profiles, with a defined section and established length, from the plastic deformation of a metal sheet. The sheet is induced to cross several stands of rolls, arranged along the same axis of advancing. The rolls induce plastic deformation in the sheet and then lead it to the desired geometric configuration. In order to control the geometric parameters of the plate during the profiling, it was created a FEM model to simulate the final stage of the technological process, developed by an industrial production line of a company located in Naples (Italy), that sells tubes with several cross sections. In this phase, the semi-finished product, having a circular cross section, is forced to cross through four stands of rolls. In this way, it changes the geometric condition of the cross section from circular to square. The model was carried out using a non-linear calculation code, which allows analyzing the parameters of interest in the different process steps. The results, obtained numerically, were compared with the experimental ones through the measurement of five specimens, obtained directly from technological process. The values of percentage deviation, regarding the external dimension and the thickness, for each step of advancement, do not exceed the 3% of error. Then, the analysis results denote the capability to simulate the cold roll forming process using finite element method.

scholarly journals INFLUENCE OF STRENGTHENING OF PARTS ON THE RELIABILITY OF MACHINES

2019 ◽  
pp. 17-22
Author(s):  
Anatoly Dudnikov ◽  
Igor Dudnikov ◽  
Oleksandr Gorbenko ◽  
Anton Kelemesh
Keyword(s):  
Plastic Deformation ◽  
Surface Layer ◽  
Wear Rate ◽  
Traditional Method ◽  
Agricultural Machinery ◽  
Deformation Method ◽  
Vibration Technology ◽  
Machine Parts ◽  
Working Bodies

The paper considers the issues of increasing the reliability of agricultural machinery through the use of reinforcing processing of recovered machine parts by plastic deformation, which provides an increase in the quality of their surface layer during recovery. The operational stability of the piston fingers and the upper heads of the connecting rods restored by vibration reinforcement on the engines working in the mechanized agricultural complex was carried out: tractor - agricultural machine - car. Studies have shown that the amount of wear of piston fingers restored by the vibration deformation method is 1.23 times smaller than the traditional method of recovery, which confirms the effectiveness of vibration technology. Technological processes of restoration of discs of diggers of beet harvesters, discs of coulters of grain planers, plow blades with use of vibrating vibrations of the processing tool are developed and put into production. The results of these developments showed an increase of 1.21 times the time of beet harvester harvesting with the diggers' wheels with the vibration-strengthened method; an increase in technical use factor of 1.07 times, compared to new 65G steel wheels. To improve the reliability of the PLN-5-35, PLN-3-35 plows, the technology of restoration of working bodies - blades is developed and introduced into production, which provides for increase of their durability and durability. The coefficient of technical use of the plow units with the blades restored by the developed technology is 1.01 times higher than that of the plow units with the new blades made of 65G steel. The wear rate of the toe, width and thickness of the blade are 1.51 respectively; 1.22 and 1.27 times less than the new 65G steel blades. The results of the study of vibrating reinforcing processing of working bodies of agricultural machinery help to increase their resource, which provides increased reliability of machines.

TECHNOLOGY OF COMBINED ELECTROMECHANOULTRASONIC TREATMENT OF SURFACE LAYERS OF MACHINE PARTS

2020 ◽  
Vol 2 ◽  
pp. 26-33
Author(s):  
V.R. EDIGAROV
Keyword(s):  
Plastic Deformation ◽  
Surface Layer ◽  
Residual Stresses ◽  
Ultrasonic Treatment ◽  
Mechanical Treatment ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Surface Layers ◽  
Machine Parts ◽  
Acoustic Treatment

The technology of combined electro–mechanical–acoustic treatment is presented, which is a combination of electro–mechanical treatment and surface plastic deformation by ultrasonic treatment. Microhardness and residual stresses in strengthened EMUzO surface layer of machine parts investigated.

INVESTIGATIONS ON BALLISTIC METHOD APPLICATION FOR SELF-STRENGTHENING 35 MM GUN BARRELS

2017 ◽  
pp. 55-68
Author(s):  
Tomasz SATŁAWSKI ◽  
Wojciech Furmanek
Keyword(s):  
Plastic Deformation ◽  
Service Life ◽  
Technological Process ◽  
Wall Thickness ◽  
High Strength ◽  
Strength Characteristics ◽  
Strengthening Effect ◽  
Local Character ◽  
Numerical Studies ◽  
Ballistic Method

The paper includes an analysis of a concept for increasing the service life of 35 mm gun barrels by technological process of self-strengthening. A process of barrel self-strengthening that uses a ballistic method based on technological firings with special ammunition of increased propelling charge is considered. In effect of analytical - numerical studies it was stated that a self-strengthening effect is strictly limited to the cartridge chamber and has a local character i.e. the plastic deformation of barrel’s material includes not more than 30% of barrel wall thickness. The received results indicate that efficiency of self-strengthening provided by the ballistic method is low and in cases of deploying materials with high strength characteristics in barrels it could not bring any benefits at all.

Sign in / Sign up

Export Citation Format

Share Document