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Metalloobrabotka № 2 (92)/2016
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Metalloobrabotka № 2 (92)/2016


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Plotnikov A.  L.,  Sergeev A.  S.,  Tikhonova Zh.  S. Рrovide the required parameters of rough  details in  work  assembled multiblademills on CNC  machines

On  the basis of regression analysis methods developed  and  proposed mathematical  model  for calculating the  roughness Ra  parameter  based  on  the signal of the thermocouple thermoelectric power E natural “tool - work- piece”, reflecting the mechanical and  thermal properties of the whole  range of processed materials and  instrumental combinations. The algorithm of functioning roughness Ra parameter calculation module for milling and  software solution that can be used  to automate the calculation of roughness parameters Ra on machines equipped with a new generation of PC-NC-class CNC systems are developed.

Keywords: mathematical model, thermopower, milling, roughness parameter algorithm CNC machine, cutting edge.

Naumov A.G.,  Elovskyi V.S.,  Komelkov V.  A.,  Kolbashov  M. A. The use  of “Peltiereffect” at the blade  cut- ting of metals

The results of studies of the effect of refrigerated air environments  using “Peltiereffect”  on  characteristics machining process.

Keywords: metal  cutting, Peltier effect, lubricant- cooling technological  means, surface roughness, shrinking chips.

Krivitsky B. A.,  Fomichev A. F. Methods determination of  rheological properties  of  high-temperature  tests twined

The  methodology  and  the results of an  experimental study of the thermal effect during high temperature torsion test of titanium alloys and  heat-resisting alloys specimens are presented. A significant warming under certain loading conditions was found. It is affects on hardening curve construction and  mathematical simulation of metal forming  processes database  software  formation. Otherwise,  a significant mistake in results of thermal fields and  power parameters  calculation  is  introduced. Based  on  the findings, recommendation of testing methodology improvement and hardening curve construction are presented.

Keywords: torsion testing, strain heating, mathematical  modeling, processing pressure.

Bezjazychnyi V. F. Calculation of temperature of surface layer  of machined part during hole burnishing

The article describes theoretical position using calculation of temperature of surface layer of machined part during hole burnishing taking info account the volumetric heat sources. Analyzed the following heat sources: a  source of heat generated  in  the core zone  of plastic deformation dominates allowance; the heat source from the leading plastic deformation; a heat source in the con- tact zone  of the cylindrical mandrel a  ribbon with  the treated surface. The  calculation is made  taking into ac- count  the temperature properties  of processed and  in-

strumental materials, dimensions and  geometry  of the

tool.  The  results of calculation  of temperature in  the surface layer of the parts for the specific processing conditions are  shown.

Keywords: burnishing  holes, surface  layer,  temperature, machining conditions.

Maksarov V. V., Keksin A. I, Tkachenko S. A. Improving the efficiency  of  the technological  process  of  manufacturing  of  internal threads in  the products  of  mining machines

In  the present article deals with  the issue of increasing the efficiency of the process of manufacturing of internal threads in  the products  of mining machines. As the analysis, the researchers of this topic isolated by tapping as the most common , the most effective and  of- ten the only  possible method  of cutting . However, tap- ping taps often have  to deal  with the dimensional instability that usually depends on the dimensional stability of thread-cutting tools. In this regard, in order to increase the dimensional stability before the tool serves threading tap handle by magnetic abrasive polishing. That method allows  changing the state of the cutting edges  and  the working surfaces of the cutting tool.

Keywords: technological  process, thread tapping, dimensional instability, dimensional tool  life, magnetic abrasive polishing, microgeometrical parameters.

Maksarov V. V.,  Timofeev D. Yu.,  Efimov  A. E. Increa- sing  the accuracy and  quality of  manufacturing  in  technological process  of  precision surfaces  of  cylinders shaft lining based  on local  thermal influence

In  the present article deals with  the issues of improving  the quality and  accuracy of processing in  the process of manufacturing hydraulic cylinders of mining equipment, through the creation of local  heat metastability. Creating a local inhomogeneous structure is carried through the heating  of the steel  billet  surface by  electrical  brushes above  the phase transition point. When crossing the plane of the cutting area with the local  thermal impact is a change in quasi-elastic and dissipative properties of the chip formation process, which leads  to the suppression of the self-oscillation process occurring in the technological system. The expense of it set are achieved in  the technological  process quality of roughness and  form accuracy of precision surfaces. The expense of it are achieved in the technological process qual- ity of roughness and  form accuracy of precision surfaces.

Keywords: technological  process, local  thermal influence, metastable, technological system, machining, auto- oscillatory process, roughness, precision manufacturing.

Leonidov P. V., Maksarov V. V., Osminko  D. A. Improving machining precision of the powered  support unit hydraulic cylinder critical surfaces on the basis  of vibration resistance lathe tool system

The  main type  of damage powered supports  unit is a problem with  sealing and  leaks in  hydraulic cylinders power system.  The  reason of leakage directly  related to the precision machining of critical inner surfaces (of the hydraulic cylinder, gland bush) and  outer surfaces (of the  piston  and  connection  rod). Dependent  of its condition the maintenance  intervals and  service intervention to the mining equipment will  be executed.

Keywords: precision manufacturing, precision surface, hydraulic power  cylinders, tool  vibration, tool  system, vibration damping, anisotropy, vibration displacement.

Vedernikov Yu.  A.,  Khisamutdinov R.  M.  Сutting helical grooves   variablepitch  on  milling machines type 6R13F30

The article describes a method for upgrading a universal gear hobbing machine. As a result of the modernization of gear hobbing machine, it is possible to improve the performance of manufacturing parts, such  as shaper cutters. This  concept  of  modernization  of the machine allows  to make  quick changeovers by changing the copier. This  saves all the settings for  processing cylindrical and  helical gears. It suffices to establish  the copier with  a straight profile. The  authors of this  method  have  a patent for the invention of the Russian Federation 2508969, IPC  B23F5 / 20.

Keywords: gear  hobbing machine,  modernization, shaper cutter.

Bundur  M. S.,  Prokopenko V. A., Pelevin N. A. Fore- casting of dynamic quality of spindle hydrostatic bearings at  the consideration of energy processes

The  great influence on  process of cutting operation and dynamics of machine-tool is provided by its major ma- chine units, such  as the primary drive and  a spindle block. In  work the device of complex researches of influence of energy  processes on  dynamic characteristics of spindle hydrostatic bearings with  use  of a  software  package of the high  «MATLAB&Simulink» level  is  considered. The library on the basis of the developed models and  programs allowing to  carry out modeling of the processes happening in  a bearing pad  bearing, to receive energy characteristics at different speeds of a spindle and  to evaluate them by the corresponding criteria is described. The  option of increase  of dynamic quality  of a control  system and  feature of the choice  of parameters  of correction  in the field of high dynamic quality is offered.

Keywords: modeling, hydrostatic bearing, energy characteristics, algorithm, correction, dynamic quality.