Metalloobrabotka № 1 (97)/2017

Maslenikov I. A. The temperature at the cutting edge of the tool during turning ductile materials

The results of the research of the stress state in the cutting zone of ductile materials. Determination of the stress distribution in the workpiece, deformation of the material, zones of contact and temperature,. The research was carried out using the theory of elasticity and theory of plasticity.

Keywords: cutting process, stresses in the material, the cutting temperature.

Kizhnyaev Ju. I., Nemtsev B. A., Yakovlev P. D., Yakovlev S.P. Workpiece hardness difference accounting during elaboration and performing core drilling machining operation

The effect raznotvёrdosti blanks to split and chip removal when drilling deep ring. Recommendations for Management of the drilling process flow control to ensure the stability of crushing and removal.

Keywords: deep holes drilling, deep holes, core drilling, chip formation process, workpiece hardness difference, chip formation control, cutting modes.

Bezjazychnyi V.F., Fomenko R. N. Technological assurance of performances of GTE

Article describes the technique of assignment of processing conditions providing quality parameters required of surface layer during the machining, as well as calculation the values of performances based on available quality parameters of surface layer and cutting modes. Processing conditions (cutting modes, geometric parameters of cutting tool) can be determined with the function of quality parameters of surface layer (residual stresses, degree of hardening and roughness of surface machined, physical and mechanical properties of the processed and tool materials, dimensions of details and the cutting tool) and precision machining. Task solution made using the provisions of similarity theory of cutting processes. The dependence between values of performances and processing conditions, as well as quality parameters of surface layer is determined. The dependences for calculation endurance limit of part material, wear resistance and contact stiffness of contact surfaces of parts are shown. The algorithms for the calculation of quality parameters of surface layer corresponding processing conditions, as well as cutting modes providing required contact stiffness are shown.

Keywords: machining, surface layer of surface of machined, performances of parts (endurance limit, wear resistance, contact stiffness), cutting modes, properties of the processed material.

Vereschaka A. S. , Lytkin D. N. Effect of the substrate on the operability of the coated cutting too

The industry's need to increase the wear resistance of carbide cutting tools poses specific challenges for science. One of the solutions, which is the use of nanostructured multilayered composite coatings. The carried out researches and the data of other authors show that the process of increasing wear resistance of carbide cutting tools is not only to develop rational coatings, but more to combine the properties of carbide substrates and coatings applied to it. In connection with this, increasing the wear resistance of the blade carbide cutting tool should be considered as a complex task of searching for a rational combination of substrate and coating.

Keywords: сarbide cutting tool, wear resistance, substrate, coating.

Egorov V. P., Mamutov V. S., Mertens K. K., Khaba-rov A. S. Еlektrogidroimpulsnaja stamping parts „Sylphon”

This paper presents the technology of electrohydraulic forming for a sylphon from a welded tube billet made of a stainless steel (12Х18Н10Т) with 0.6 mm thickness. Regarding a relatively simple shape of the sylphon, the first considered choice was the manufacturing with a coaxial arrangement of the working electrodes. However, the results of the workpiece forming simulation, which has been performed using the finite-element LS-DYNA® 971 code, show that even when the workpiece fills the die profile incompletely, the strain paths for separate points of the workpiece overstep the bounds of a forming limit diagram. This can be explained by the inertia of a flange of the workpiece in axial direction. So the forming with a coaxial discharge chamber has been proposed: the displacement of the flange to an axial direction has been executed using an electrohydraulic press effort, and when the stamping parts were united, an additional forming and calibration of the workpiece has been performed by the impulse pressure in the water.

Keywords: electrohydraulic forming, sylphon from welded tube part, stainless steel with 0.6 mm thickness, coaxial arrangement of working electrodes, workpiece forming, results of computer simulations, electrohydraulic press effort, displacement of flange to an axial direction, impulse pressure, additional forming and calibration.

Nosenko V. A., Avilov A. V., Nosenko S. V., Bakh-mat V. I. The research of transfer titanium, zirconium, and molybdenum on the silicon carbide after microcutting

The results of the study the surface of the silicon carbide crystals after mikrocutting titanium, zirconium, and molybdenum at a speed of 60 m/s. Simulation of surface grinding was performed by specially prepared silicon carbide crystals, sharpened to a cone with an apex angle of 120°. The state of the silicon carbide surface and the metal adhering investigated on two-beam scanning electron microscope Versa 3D. The concentration of the metal on the surface of the silicon carbide was determined by the local micro X-ray analysis. It shows features of the formation of the wear area after mikrocutting met als and their transfer to the surface of the crystal. The main type of silicon carbide’s wear after mikrocutting titanium and zirconium is chipping micro volumes of the crystal. Molybdenum is able to penetrate into the microcracks formed on the surface of silicon carbide.

Keywords: silicon carbide, titanium, zirconium, molybdenum, mikrocutting, surface morphology, micro X-ray spectral analysis.

Shakhnazarov K. Y. Anomalies plasticity brass, bronze, silumin, duralumin and annealed steel, as a result of qualitative changes in crystallization interval

Plasticitys anomalies of single-phase structure of structure of brass with ~ 32 % Zn, cast with ~ 8 % Sn and annealed with ~ 13 % Sn tin bronzes, silumins before modification with ~ 12 % Si and after modification with ~ 14 % Si, aged duralumin with ~ 6 % Cu and annealed steel with ~ 0,5 C as a result of qualitative changes of crystallization ranges extension along the temperature are confirmed by comparison of anomalies with equilibrium and njn-equilibrium phase diagrams Cu с Zn, Cu – Sn, Al – Si, Al – Cu, Fe – C. In this work — on the basis of anomalies — declared interim phase in the most common alloys — brass, bronze, silumin, duralumin and steel.

Keywords: brass, bronze, silumin, duralumin, steel, crystallization, strength, ductility.

Vedernikov Yu. A., Khisamutdinov R. M., Khisa-mutdinov M. R. Automation binding workpiece coordinate systems and machine

Sensor for the automatic binding coordinate system parts or tools to a machine coordinate system, comprising a housing, a measuring probe mounted in the housing at one end and having a tip at the other end, the node creation measuring force formed as a spring disposed between the housing and the probe, support elements associated with the probe, wherein said probe end disposed in the housing, is designed as a spherical bearing mounted in spring-loaded bearings, each of the four support members connected to the probe by means of the piston at an angle 90grad. contains attached by threads to the housing a cylindrical sensor housing made of a diamagnetic material, in which is mounted a spring-loaded formed of magnetically soft ferromagnetic material transformer having a circular cross section and two windings, one of which being the primary winding, is fed AC voltage, and the other is output, and it depends the change of the gap h between the piston and the end of the transformer is formed EMF, while opposing transformers connected to differential circuit, and their outputs are connected to the input of the machine CNC system, the output of which in turn, through the power converters connected to the inputs of the drive control system.

Keywords: machining parts, sensor, binding, coordinate system, CNC, bell-type probe, the probe with an external cone, reduce labor intensity.

Maksarov V. V., Keksin A. I. Technological improvement of the quality of geometrically-comlex surfaces by magnetic abrasive polishing

In presented article deals with the issues related to technological improvement of the quality of geometrically complex surfaces. As technological method of formation of surface’s quality characteristics is used a process of magnetic abrasive polishing, which is the most effective method, allowing to process complex surfaces of the parts. There are results of experimental researches, which show the influence of technological parameters of magnetic abrasive polishing on quality parameters of complex surfaces.

Keywords: the quality of geometrically complex surfaces, magnetic abrasive polishing, screw tool, radius cutting edges, the roughness of cutting edges, hardness of cutting edges.