scholarly journals Temperature simulation of blank ground with face solid and segment disks in CAE-Solid Works complex

2017 ◽  
Vol 2 (11) ◽  
pp. 23-29 ◽  
Author(s):  
Алексей Морозов ◽  
Aleksey Morozov ◽  
Владимир Гусев ◽  
Vladimir Gusev
Keyword(s):  
Surface Layer ◽  
Solid State ◽  
Thermal Damage ◽  
Initial Conditions ◽  
Ground Surface ◽  
State Model ◽  
Cutting Surface ◽  
Grinding Tool ◽  
Solid Works ◽  
Face Grinding

Flat face grinding is characterized with large areas of a cutting surface contact with a blank under machining which re-sults in intensive heat generations in a cutting area which is able to cause a thermal damage of the surface layer. Thereupon there is developed a designed heat model of a blank, the initial conditions are defined, and there is created a solid-state model of an abrasive segment with a trapezoidal face cutting surface and a temperature simulation of the blank ground with a solid and discrete face tool is carried out in a modern CAE- Solid Works complex. The result of modeling have shown that the application of the discrete face grinding tool equipped with abrasive segments allows decreasing a temperature of the surface machined by 26-30% as compared to a face grinding tool with a solid cutting surface, which decreases considerably the likelihood of defects appearance in a ground surface layer of a part.

scholarly journals Surface microgeometry treated with a precast textured grinding wheel

2020 ◽  
Vol 329 ◽  
pp. 03019
Author(s):  
Vladimir Gusev
Keyword(s):  
Surface Layer ◽  
Thermal Damage ◽  
Transverse Plane ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Geometric Errors ◽  
Time Process ◽  
Cutting Surface ◽  
Surface Microgeometry ◽  
Textured Grinding Wheel

The article considers the formation of the geometry of internal cylindrical surfaces when grinding with a precast textured wheel, which is under the influence of the unbalances main vector and a variable cutting force caused by the discreteness of the cutting surface (texture). Under the influence of these factors, each point of the axis of the textured tool makes vibrations in the transverse plane in the form of a wavelike sinusoid consisting of two sinusoids. The Space-time process of forming the processed surface is mathematically described. It is in applying wavelike sinusoids to the workpiece, taking into account their phase shift at each revolution of the workpiece. To ensure minimal geometric errors at the maximum possible productivity of the grinding process, phase shifts φf = (0.07–0.12)π and φf = (0.88–0.93)π are recommended. The results of the study are recommended for use in the production of high-precision details, primarily from materials that are prone to thermal damage to the surface layer under the influence of high temperature in the grinding zone.

Effects of Cutting Edge Truncation on Ultrasonically Assisted Grinding

2008 ◽  
Vol 389-390 ◽  
pp. 368-374 ◽  
Author(s):  
Keisuke Hara ◽  
Hiromi Isobe ◽  
Akira Kyusojin
Keyword(s):  
Ground Surface ◽  
Grinding Force ◽  
Cutting Edge ◽  
Mirror Surface ◽  
Skilled Workers ◽  
Oscillation Effect ◽  
Die Steel ◽  
Grinding Tool ◽  
Grinding Technique ◽  
Face Grinding

High precision mold grinding technique to obtain mirror surface is required which realizes minimization or omission of final polishing by skilled workers. In the previous reports, ultrasonically diamond grinding experiments were carried out to confirm ultrasonically oscillation effect for die steel face grinding. Mirror surface was obtained successfully and little abrasive worn out was found. In the above technique, the cutting edge shape of a tool affects the ground surface resulting from transcription of cutting edge. In other words, cutting edge truncation of grinding tool is required to be smooth and glossy surface. This paper describes the cutting edge truncation of diamond electroplated tools which are used in ultrasonically assisted grinding. Experiments were carried out to confirm truncation effects on the ground surface and grinding force. It was confirmed that cutting edge truncation is effective method to obtain mirror surface and excessive truncation causes large grinding force and chattering.

scholarly journals Detailed Thermo-Kinematic Analysis of Face Grinding Operations with Straight Wheels

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 524
Author(s):  
Lander Urgoiti ◽  
David Barrenetxea ◽  
Jose Antonio Sánchez ◽  
Jose Luis Lanzagorta
Keyword(s):  
Process Optimization ◽  
Contact Area ◽  
Thermal Effects ◽  
Thermal Damage ◽  
Chip Thickness ◽  
Ground Surface ◽  
Acid Etching ◽  
Experimental Findings ◽  
Grinding Operations ◽  
Face Grinding

This paper presents a new model that relates thermal aspects with process kinematics in face grinding applications with straight wheels. Changes in chip thickness along the contact area were considered in the model, which allows for taking into account local thermal effects. The model was validated through grinding tests conducted with conventional alumina wheels. Power signals were used as input for the model. Thermal damage on the ground surface was detected using eddy current technology and revealed by acid etching. Both the model and experimental findings provide the basis for developing an approach for process optimization.

Investigation of the Surface Layer Structure of High-Chromium and High-Strength Steels at the Variation of the Heating Temperature

2016 ◽  
Vol 870 ◽  
pp. 431-436 ◽  
Author(s):  
V.B. Dementyev ◽  
T.N. Ivanova
Keyword(s):  
Surface Layer ◽  
High Speed ◽  
Layer Structure ◽  
Heating Temperature ◽  
High Strength Steels ◽  
High Strength ◽  
Grinding Wheel ◽  
High Chromium ◽  
Cutting Surface ◽  
Grinding Tool

At present, hard-to-machine materials such as structural alloy steels with various chemical element additives – tungsten, chromium, etc. - are most widely used in engineering. When conventional finish methods are used for the treatment of hard-to-machine materials, the most important problems are the difficulty of obtaining work surfaces of a required quality in terms of accuracy, roughness and the physicochemical composition, and the low output. In the present paper, a finish method for metal treatment– grinding – is discussed. Zones of the formation of the surface stress state due to heating have been revealed: the zone of an insignificant increase in temperature in the contour of the contact of a grinding wheel and a work surface; the zone of the temperature intensive growth; and the zone of the temperature abrupt drop. The investigation has been conducted of the surface layer structure of high-strength and high-chromium steels during high-speed heating – grinding. The peculiarities of the change of the surface layer state of the above steels have been revealed after grinding with the use of conventional grinding wheels with a continuous cutting surface and a discontinuous cutting surface. Some recommendations are given for grinding of the high-strength 12Cr18Ni9 and high-chromium Cr12, Cr12Mo and Cr12V steels, taking into account the specific features of different technological situation characteristic of a specific grinding tool, a grinding tool grade, and conditions of grinding and cutting.

A Solid-State Model for Photonic Localization in Molecular Quasi-Continua

1991 ◽  
Vol 14 (3) ◽  
pp. 211-215 ◽  
Author(s):  
R Graham ◽  
D. L Shepelyansky
Keyword(s):  
Solid State ◽  
State Model

Measurement of Residual Stress Distribution of Ground Silicon Nitride by Glancing Incidence X-ray Diffraction Technique

1995 ◽  
Vol 39 ◽  
pp. 331-338
Author(s):  
Yoshihisa Sakaida ◽  
Keisuke Tanaka ◽  
Shintaro Harada
Keyword(s):  
Residual Stress ◽  
Surface Layer ◽  
Stress Distribution ◽  
Stress Measurement ◽  
Scintillation Counter ◽  
Ground Surface ◽  
Residual Stress Distribution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Very High

A new method of X-ray stress measurement was proposed to estimate non-destructively the steep residual stress distribution in the surface layer of ground Si3N4. We assumed an exponential decrement of the residual stress near the ground surface, and derived a formula for the lattice strain as a function of sin2Ψ. In the experiments, the diffraction angles were measured on the ground surface for a widest possible range of sin2ѱ using an Ω-goniometer. In order to measure the diffraction angle at very high sin η values, a scintillation counter was located on the -η side and an incident X-ray beam impinged on the ground surface with a very low angle from the +η side using the glancing incidence X-ray diffraction technique. A strong non-linearity was found in the 20-sin2ѱ diagrams especially at very high ѱ -angles. From the analysis of non-linearity, the stress distribution in the surface layer was determined. Tine residual stress took the maximum compression of 2 GPa at a depth of about 0.5 μm from the surface, and then diminished to zero at about 25 μm in depth. In the close vicinity of the ground surface, the compressive residual stress was relieved because of both the surface roughness and microcracking induced during the grinding process.

scholarly journals Ground Surface Layer in α Fe-Fe3C Alloys

1977 ◽  
Vol 43 (372) ◽  
pp. 3112-3124 ◽  
Author(s):  
Hiroshi EDA ◽  
Kozo KISHI
Keyword(s):  
Surface Layer ◽  
Ground Surface

High-Dose Titanium Ion Implantation into Epitaxial Si/3C-SiC/Si Layer Systems for Electrical Contact Formation

2000 ◽  
Vol 622 ◽  
Author(s):  
Jörg K.N. Lindner ◽  
Stephanie Wenzel ◽  
Bernd Stritzker
Keyword(s):  
Surface Layer ◽  
Solid State ◽  
Ion Implantation ◽  
Silicon Substrate ◽  
Ion Beam ◽  
Electrical Contact ◽  
Titanium Silicide ◽  
Solid State Reactions ◽  
High Dose ◽  
Homogeneous Surface

ABSTRACTHigh-dose titanium implantations have been performed into ion beam synthesized heteroepitaxial layer systems of Si/3C-SiC/Si(100) in order to study the formation of titanium silicide layers in the silicon top layer. The structure and composition of layers was analysed using RBS, XRD, XTEM and EFTEM. The sputtering rates of 180 keV Ti ions were determined using the lower SiC/Si interface as a marker. A homogeneous surface layer with the stoichiometry of TiSi2 was formed by a nearly stoichiometric implantation and subsequent annealing. The formation of more metal-rich silicides was observed at doses where the peak Ti concentration largely exceeds the TiSi2 stoichiometry and where the total amount of Ti atoms in the top layer is greater than the amount needed to convert the entire Si top layer into TiSi2. Under these conditions, strong solid state reactions of the implanted Ti atoms with the buried SiC layer and the silicon substrate are observed.

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