Combined hardening of the working surface of machine parts

1987 ◽  
Vol 19 (11) ◽  
pp. 1591-1596
Author(s):  
O. I. Zubchenko ◽  
V. B. Margolin
Keyword(s):  
Working Surface ◽  
Combined Hardening ◽  
Machine Parts

scholarly journals Image Processing in Contact Endurance Research

2021 ◽  
Author(s):  
Andrey Kirichek ◽  
Sergey Barinov ◽  
Aleksandr Yashin
Keyword(s):  
Cyclic Loads ◽  
Second Stage ◽  
The Third ◽  
Working Surface ◽  
Numerical Assessment ◽  
Third Stage ◽  
Accessible Method ◽  
Endurance Tests ◽  
Machine Parts

Machine parts operating under contact cyclic loads are subject to a destruction risk in the event of their working surface pitting (destruction). To increase the service life of such parts, various finishing and hardening technologies are used. In the absence of standard methods used to assess the durability of parts operating under contact endurance conditions, they have should be developed in relation to a specific case. The fractal geometry methods' usage in analyzing the surface layer state of parts operating under contact endurance conditions is complicated due to high equipment cost and fine and coarse noise high risk, which negatively affects the quality of generated images. The aim of the work is to develop a simple and accessible method for evaluating the results of contact endurance tests, based on the analysis of the investigated surface images. The developed patented technique consists of several stages. At the first stage, high-resolution photographing of the surface under investigation is performed using a microscope, providing magnification of no more than 1 ? 50. At the second stage, the obtained image is analyzed in the cad editor, where the number and area of the investigated defects are determined. At the third stage, wear result numerical assessment is carried out according to the proposed algorithm.

scholarly journals Mechanical oscillations in the technological processes of restoration of machine parts

2019 ◽  
pp. 62-67
Author(s):  
Anatoly Dudnikov ◽  
Igor Dudnikov ◽  
Vladimir Dudnik ◽  
Taras Lapenko
Keyword(s):  
Residual Strain ◽  
Residual Deformation ◽  
Outer Diameter ◽  
Technological Processes ◽  
Mechanical Oscillations ◽  
Working Surface ◽  
Inner Diameter ◽  
Optimal Values ◽  
Machine Parts

The paper addresses the issues of increasing the durability of piston pins of automotive and tractor engines through the use of vibration oscillations during their restoration. Experimentally found the optimal values of the angle of inclination of the machined tool – punch and its effect on the amount of metal sticking to the working surface of the punch, which reduces the quality of the processed surface of the piston pins and increases the non-uniformity of deformation in the radial direction and length. The change of the residual strain along the outer and inner diameter of the piston pin during vibratory deformation is shown. The obtained mathematical dependences of the change in residual strain on the outer diameter on the value of the allowance for processing. Experimentally found a relationship that associates residual deformation with the wear of piston pins. The results of the work will be used for the development of technological processes for the restoration of piston pins and bushings of the top heads of connecting rods of various autotractor engines by the method of vibration deformation.

scholarly journals Surface Hardening of Machine Parts Using Nitriding and TiN Coating Deposition in Glow Discharge

Machines ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 42
Author(s):  
Alexander Metel ◽  
Sergey Grigoriev ◽  
Yury Melnik ◽  
Marina Volosova ◽  
Enver Mustafaev
Keyword(s):  
Surface Hardening ◽  
Gas Pressure ◽  
Hard Coatings ◽  
Parallel Plates ◽  
Study Results ◽  
Liquid Titanium ◽  
Combined Hardening ◽  
Machine Parts ◽  
Coating Synthesis ◽  
Density Of Electrons

Surface hardening of machine parts substantially improves their performance. The best results are obtained when combined hardening consists of surface nitriding and subsequent deposition of hard coatings. The nitriding of machine parts immersed in the plasma of glow coatings have been studied, and the study results are presented. Titanium atoms for coating synthesis are obtained via titanium evaporation in a hollow molybdenum anode of the discharge. Stable evaporation of titanium occurs only when the power density of electrons heating the liquid titanium does not exceed ~500 W/cm2. To start evaporation, it is only necessary to reduce the gas pressure to 0.02 Pa. To stop evaporation, it is enough to increase the gas pressure to 0.1 Pa. Fast argon and nitrogen atoms used for cleaning the machine parts, heating them, and bombarding the growing coating are obtained using a grid composed of plane-parallel plates under high negative voltage and immersed in plasma.

scholarly journals Expanding Technological Capabilities of The Combined Hardening of Steel by Deformation

2019 ◽  
Vol 297 ◽  
pp. 05004
Author(s):  
Andrei Kirichek ◽  
Oleg Fedonin ◽  
Dmitry Solovyov ◽  
Svetlana Fedonina
Keyword(s):  
Heat Treatment ◽  
Sliding Friction ◽  
Subsurface Layer ◽  
Chemical Heat Treatment ◽  
Chemical Heat ◽  
The Core ◽  
Wave Deformation ◽  
Deformation Hardening ◽  
Combined Hardening ◽  
Machine Parts

The technology of wave deformation hardening of metal machine parts is described, which allows obtaining a hardened surface layer up to 10 mm deep. The article presents the results of studying the microstructure and hardness of the samples strengthened as a result of chemical heat treatment and combined hardening consisting of preliminary wave deformation hardening and subsequent chemical heat treatment of structural alloyed steel 15CrС2Ni2Mg. It is established that a preliminary impact on the cemented material by a deformation wave contributes to creating uniformly high packing density of martensite, as well as smaller sizes of martensite needles in the subsurface layer and at the border of the cemented layer, in the core of the sample and contributes to the absence of large-needle martensite. Applying this technology allows forming a high uniform hardness at 65 HRC at a depth of 1.5 mm, with its gradual reduction to the core of the sample, while maintaining a high level of toughness. The results obtained allow recommending wave deformation hardening and the combined technology based on it to improve the performance properties of variable machine parts that operate under the conditions of sliding friction and impact loads.

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.

CDA C18700

Alloy Digest ◽  
1988 ◽  
Vol 37 (1) ◽  
Keyword(s):  
Electrical Conductivity ◽  
Corrosion Resistance ◽  
Copper Alloy ◽  
Base Alloy ◽  
Heat Treating ◽  
High Electrical Conductivity ◽  
Copper Base ◽  
Screw Machine ◽  
Machine Parts ◽  
Copper Base Alloy

Abstract CDA C18700 is a copper-base alloy containing lead (nominally 1.0%). The lead is added to impart free-cutting properties to the metal. Although the lead lowers the electrical conductivity of CDA C18700 slightly below that of tough-pitch copper, it still has high electrical conductivity well within the limits needed for most current-carrying requirements. Typical uses comprise electrical motor and switch parts, electrical connectors and screw-machine parts requiring high conductivity. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-533. Producer or source: Copper and copper alloy mills.

KEMPER CuSn6

Alloy Digest ◽  
2018 ◽  
Vol 67 (6) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Copper Alloy ◽  
High Performance ◽  
Electronics Industry ◽  
Bend Strength ◽  
Leaf Springs ◽  
Machine Parts

Abstract Alloy CuSn6 (UNS C51900) is a high-performance copper alloy. Typical uses include components for the electronics industry such as connector springs, relays, leaf springs, and switches as well as machine parts. This datasheet provides information on composition, physical properties, hardness, tensile properties, and bend strength. It also includes information on corrosion resistance as well as forming and joining. Filing Code: Cu-873. Producer or source: Gebr. Kemper GmbH + Company KG Metallwerke.

COPPER ALLOY No. 314

Alloy Digest ◽  
1978 ◽  
Vol 27 (7) ◽  
Keyword(s):  
Electrical Conductivity ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
Physical Properties ◽  
Copper Alloy ◽  
Heat Treating ◽  
Lead Alloy ◽  
Screw Machine ◽  
Copper Zinc ◽  
Machine Parts

Abstract Copper Alloy No. 314 is a copper-zinc-lead alloy with moderate strength and good ductility. It has good electrical conductivity, excellent machinability and a rich bronze color. Its uses include electrical connectors, screw-machine parts and builders' hardware. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-357. Producer or source: Brass mills.

COPPER ALLOY No. C31600

Alloy Digest ◽  
1980 ◽  
Vol 29 (7) ◽  
Keyword(s):  
Electrical Conductivity ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
Physical Properties ◽  
Copper Alloy ◽  
Heat Treating ◽  
Screw Machine ◽  
Copper Zinc ◽  
Machine Parts ◽  
Lead Nickel

Abstract Copper Alloy No. C31600 is a free-machining copper-zinc-lead-nickel alloy with moderate strength and good ductility. It has fairly good electrical conductivity and an attractive, rich-looking bronze color. Its many applications include screw-machine parts, architectural fabrications, electrical connectors and hardware. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-399. Producer or source: Brass mills.

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