Evaluation of the Possibilities of Processing High-Alloy Corrosion-Resistant Steels during Grinding Operations

2021 ◽  
Vol 1037 ◽  
pp. 603-613
Author(s):  
Andrey M. Romanenko ◽  
Dmitry B. Shatko ◽  
Andrey A. Nepogozhev ◽  
Pavel A. Strelnikov
Keyword(s):  
Depth Of Cut ◽  
Grinding Wheel ◽  
High Alloy ◽  
Corrosion Resistant ◽  
Temperature Changes ◽  
Steel Processing ◽  
Cutting Zone ◽  
Centerless Grinding ◽  
Control Wheel ◽  
Grinding Operations

The issues of processing high-alloy corrosion-resistant steels by the method of centerless cylindrical grinding are considered in the article. Experimental data on changes in the parameters of roughness and hardness of a workpiece depending on the depth of cut, the speed and the design features of a control wheel are presented. The change in the microhardness of a part depending on the depth of cut is analyzed. Much attention is paid to the study of thermal stress of the grinding process. Images of temperature changes in the cutting zone depending on the grinding wheel characteristics are shown. Conclusions in the form of practical recommendations for improving high-alloy steel processing by the method of centerless grinding are formulated on the basis of the results obtained.

A Study on the Optimum Condition Selection of Rotary Dressing System of Ultra-Precision Centerless Grinding Machine for Ferrule

2005 ◽  
Vol 291-292 ◽  
pp. 189-194 ◽  
Author(s):  
Eun Sang Lee ◽  
Y.-J. Chun ◽  
Nam Kyung Kim
Keyword(s):  
Optimum Condition ◽  
Hall Sensor ◽  
Depth Of Cut ◽  
Grinding Wheel ◽  
Rotating Speed ◽  
Ultra Precision ◽  
Sensor Signals ◽  
Centerless Grinding ◽  
Grinding Machine ◽  
Selection Of

The optimum condition selection of rotary dressing operations using Hall and AE sensor is presented. The acquired current signals from a hall sensor were studied as one of the method to obtain the optimum condition of dressing and the correlations between dressing condition and AE signals were also evaluated with the root mean square (RMS). Dressing operation was performed to investigate the effects of depth of cut, rotating speed and coolant. In order to verify the optimum condition of dressing, AE and hall sensor signals were compared in RMS with the surface micrograph of grinding wheel. This verification experiment demonstrates the effective dressing condition selection for centerless grinding.

scholarly journals The Effect of Grinding Wheel Contact Stiffness on Plunge Grinding Cycle

Inventions ◽  
2020 ◽  
Vol 5 (4) ◽  
pp. 62
Author(s):  
Fukuo Hashimoto ◽  
Hiroto Iwashita
Keyword(s):  
Normal Load ◽  
Contact Stiffness ◽  
Critical Parameters ◽  
Grinding Wheel ◽  
Plunge Grinding ◽  
Contact Loads ◽  
Proposed Model ◽  
Machine Stiffness ◽  
Centerless Grinding ◽  
Grinding Operations

This paper presents the effect of grinding wheel contact stiffness on the plunge grinding cycle. First, it proposes a novel model of the generalized plunge grinding system. The model is applicable to all plunge grinding operations including cylindrical, centerless, shoe-centerless, internal, and shoe-internal grinding. The analysis of the model explicitly describes transient behaviors during the ramp infeed and the spark-out in the plunge grinding cycle. Clarification is provided regarding the premise that the system stiffness is composed of machine stiffness and wheel contact stiffness, and these stiffnesses significantly affect productivity and grinding accuracy. The elastic deflection of the grinding wheel is accurately measured and formulas for representing the deflection nature under various contact loads are derived. The deflection model allows us to find the non-linear contact stiffness with respect to the normal load. The contact stiffnesses of four kinds of grinding wheels with different grades and bond materials are presented. Both cylindrical grinding and centerless grinding tests are carried out, and it is experimentally revealed that the time constant at ramp infeed and spark-out is significantly prolonged by reducing the grinding force. It is verified that a simulation of the grinding tests using the proposed model can accurately predict critical parameters like forces and machine deflection during plunge grinding operations. Finally, this paper provides a guideline for grinding cycle design in order to achieve the required productivity and grinding accuracy.

Paper 40: Measurement and Control of the Residual Stress Produced by Grinding Operations

1967 ◽  
Vol 182 (11) ◽  
pp. 205-210 ◽  
Author(s):  
J. Loxham ◽  
J. Purcell
Keyword(s):  
Residual Stress ◽  
Graphical Form ◽  
Depth Of Cut ◽  
Grinding Wheel ◽  
Full Explanation ◽  
The Individual ◽  
Grinding Operations ◽  
And Control ◽  
Measurement And Control ◽  
Made In

The grinding process is surveyed and a technique is described which enables the efficiency of the grinding wheel, coolant, and machine tool system to be determined. The analysis is made in terms of the maximum possible depth of cut that can be taken by the individual grits of the grinding wheel and the volume of material removed from the workpiece at this loading per unit volume of grinding wheel lost. Suggestions are made for the practical application of the technique to minimize the residual stress which is produced by the grinding operation. The results which have been achieved are shown in graphical form, and suggestions are made for the full explanation of the technique.

scholarly journals Calculating the profile of intermittent grinding wheel for the sharpening teeth of the broach

2018 ◽  
Vol 224 ◽  
pp. 01003
Author(s):  
Vladimir Bogutsky ◽  
Yurij Novoselov ◽  
Leonid Shron
Keyword(s):  
Metal Cutting ◽  
Cutting Tools ◽  
Grinding Wheel ◽  
Grinding Wheels ◽  
Discontinuous Surface ◽  
Thermodynamic Conditions ◽  
Cutting Zone ◽  
Grinding Operations ◽  
Process Productivity

The article shows that during the grinding of complex profile blades of metal cutting tools from tool steels, unfavorable thermodynamic conditions are created in the cutting zone and, as a result, grinding burns and cracks occur on the surface of the polished workpiece. One of the methods of controlling the temperature in the cutting zone at the final grinding operations is the use of grinding wheels with a discontinuous surface. The method of calculating the profile of the discontinuous surface of the grinding wheel presented in the article makes it possible to determine its geometric parameters taking into account the wear resistance of the grinding wheel and the heat stress of the process of treatment. The results of the verification of the proposed technique in the production conditions are given which showed that the treatment of the teeth of the broaches with a grinding wheel with a discontinuous profile, in comparison with the machining of broaches according to the traditional technology, provides a higher quality of blade surfaces, while the process productivity, compared with the factory technology, increased by 20...26%.

scholarly journals Numerical and Experimental Study on the Grinding Performance of Ti-Based Super-Alloy

2021 ◽  
Vol 11 (3) ◽  
pp. 191-203
Author(s):  
Hung Trong Phi ◽  
Got Van Hoang ◽  
Trung Kien Nguyen ◽  
Son Hoanh Truong
Keyword(s):  
Specific Energy ◽  
Cubic Boron Nitride ◽  
Cutting Parameters ◽  
Depth Of Cut ◽  
Grinding Wheel ◽  
Grade 5 ◽  
Dry Grinding ◽  
Force Ratio ◽  
Cutting Zone ◽  
Cbn Grinding Wheel

The experiments of the surface grinding of Ti-6Al-4V grade 5 alloy (Ti-64) with a resin-bonded cubic Boron Nitride (cBN) grinding wheel are performed in this research to estimate the influence of cutting parameters named workpiece infeed speed, Depth of Cut (DOC), cooling condition on the grinding force, force ratio, and specific energy. A finite element simulation model of single-grain grinding of Ti-64 is also implemented in order to predict the values of grinding forces and temperature. The experimental results show that an increase of workpiece infeed speed creates higher intensified cutting forces than the DOC. The grinding experiments under wet conditions present slightly lower tangential forces, force ratio, and specific energy than those in dry grinding. The simulation outcomes exhibit that the relative deviation of simulated and experimental forces is in the range of 1-15%. The increase in feed rate considerably reduces grinding temperature, while enhancement of DOC elevates the heat generation in the cutting zone.

scholarly journals Abrasive machining of high-alloy corrosion resistant steels by example of 12Kh18N10T

2021 ◽  
pp. 98-106
Author(s):  
A. M. Romanenko ◽  
D. B. Shatko ◽  
A. A. Nepogozhev ◽  
Ya. S. Karavaev
Keyword(s):  
Experimental Data ◽  
Physical And Mechanical Properties ◽  
Grinding Wheel ◽  
Abrasive Machining ◽  
High Alloy ◽  
Machined Surface ◽  
Workpiece Surface ◽  
Corrosion Resistant ◽  
Average Temperature ◽  
Machined Surface Roughness

The paper focuses on research into processing of high-alloy corrosion resistant steels by the method of centreless circular grinding. The physical and mechanical properties of such steels determine certain difficulties in their grinding as compared with other materials, which necessitates a thorough investigation of this issue. The paper presents experimental data on the dependence of machined surface roughness and hardness, as well as workpiece surface average temperature and microhardness, on the machining conditions and grinding wheel characteristics.

Dynamic Model of Material Removal Process in Through-Feed Centerless Grinding Based on the Lagrange Equation

2015 ◽  
Vol 667 ◽  
pp. 173-180 ◽  
Author(s):  
Cui Qi ◽  
Shi Jin Chen ◽  
Hui Ding ◽  
Kai Cheng
Keyword(s):  
Material Removal ◽  
Lagrange Equation ◽  
Grinding Wheel ◽  
Removal Process ◽  
3D Space ◽  
Centerless Grinding ◽  
Control Wheel ◽  
Geometric Relationship ◽  
And Control ◽  
Relationship Of

Due to the unfixed state of the workpiece and the dissimilarity between sections in through-feed centerless grinding, the positions and orientations of the workpiece keep changing in the grinding process, which are coupled with the workpiece roundness generation. In this paper the positions and orientations of the workpiece are described by the dynamic equations obtained from Lagrange equation. And the homogeneous coordinate transformation is applied to present the profiles of the workpiece, grinding wheel and control wheel in the reference frame. Finally the time varying profile of the workpiece is obtained for the investigation of the material removal process in 3D space. The material properties of the workpiece, the wheels and the workrest combined with the geometric relationship of their profiles are utilized to calculate the interaction between them, including the three forces along the axes and the three moments about the axes.

Evaluating the influence of grinding mode on part’s accuracy and grinding wheel’s wear in grinding profile for ball bearing's inner ring groove

2018 ◽  
Vol 56 (4) ◽  
pp. 531
Author(s):  
Nguyen Anh Tuan ◽  
Vu Toan Thang ◽  
Nguyen Viet Tiep
Keyword(s):  
Theoretical Analysis ◽  
Current Issue ◽  
Grinding Wheel ◽  
Machining Accuracy ◽  
Ring Groove ◽  
Production Practice ◽  
Wear Of Grinding Wheel ◽  
Output Factors ◽  
Grinding Operations ◽  
Technological Mode

Determining the influence of technological mode factors on machining accuracy is always an current issue in the production practice especially for grinding operations. This paper presents some research results to determine the effect of grinding parameters on grinding wheel’s wear and part’s accuracy in grinding profile for ball bearing's inner ring groove. From theoretical analysis and experimental results, the article assesses the influence of grinding mode factors on output factors. Based on that, the economic limitation wear of grinding wheel at three different grinding modes is determined.

Study on Edge Contact Area and Surface Integrity of Workpiece in Point Grinding Process

2009 ◽  
Vol 407-408 ◽  
pp. 577-581
Author(s):  
Shi Chao Xiu ◽  
Zhi Jie Geng ◽  
Guang Qi Cai
Keyword(s):  
Surface Integrity ◽  
Contact Area ◽  
High Speed ◽  
Ground Surface ◽  
Depth Of Cut ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Edge Contact ◽  
Cylindrical Grinding ◽  
Theoretic Foundations

During cylindrical grinding process, the geometric configuration and size of the edge contact area between the grinding wheel and workpiece have the heavy effects on the workpiece surface integrity. In consideration of the differences between the point grinding and the conventional high speed cylindrical grinding, the geometric and mathematic models of the edge contact area in point grinding were established. Based on the models, the numerical simulation for the edge contact area was performed. By means of the point grinding experiment, the effect mechanism of the edge contact area on the ground surface integrity was investigated. These will offer the applied theoretic foundations for optimizing the point grinding angles, depth of cut, wheel and workpiece speed, geometrical configuration and size of CBN wheel and some other grinding parameters in point grinding process.

Calculation of Effective Ground Depth of Cut by Means of Grinding Process Model

2011 ◽  
Vol 496 ◽  
pp. 7-12 ◽  
Author(s):  
Takazo Yamada ◽  
Michael N. Morgan ◽  
Hwa Soo Lee ◽  
Kohichi Miura
Keyword(s):  
Process Model ◽  
Ground Surface ◽  
Depth Of Cut ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Wheel Wear ◽  
Elastic Deformations ◽  
Proposed Model ◽  
Effective Depth ◽  
Grinding Machine

In order to obtain the effective depth of cut on the ground surface, a new grinding process model taking into account thermal expansions of the grinding wheel and the workpiece, elastic deformations of the grinding machine, the grinding wheel and the workpiece and the wheel wear was proposed. Using proposed model, the effective depth of cut was calculated using measured results of the applied depth of cut and the normal grinding force.

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