scholarly journals Effect of Carbon Content in Stainless Steels on Quantity of Grinding Energy

2014 ◽  
Vol 14 (3) ◽  
pp. 45-52
Author(s):  
R. Wójcik
Keyword(s):  
Carbon Content ◽  
Stainless Steels ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Surface Layers ◽  
Abrasive Grains ◽  
Dry Grinding ◽  
Different Types ◽  
Grinding Technique ◽  
Special Parameter

Abstract The paper presents a study of the process of grinding stainless steels with different carbon contents. Verified the size and scope of the energy which is introduced in the surface layers for different types of abrasive grains and binders. The influence of parameters in plunge grinding process was considered in studies. The energy ratio was used for this purpose, which was calculated by multiplying energy and time of grinding wheel contact with the workpiece. To investigate influence of different carbon content on the level of energy density generated during grinding process special parameter Bp have been evaluated. The grinding tests were conducted in dry grinding technique.

Study on the Formation of Grind-Hardening of Steel AISI 1066

2007 ◽  
Vol 329 ◽  
pp. 57-62 ◽  
Author(s):  
Ju Dong Liu ◽  
Gui Cheng Wang ◽  
B.L. Wang ◽  
K.M. Chen
Keyword(s):  
Hardened Layer ◽  
Depth Of Cut ◽  
Grinding Wheel ◽  
Micro Hardness ◽  
Cooling Conditions ◽  
Dry Grinding ◽  
Structures And Properties ◽  
Grind Hardening ◽  
Steel Aisi ◽  
Grinding Technique

Grind-hardening was done on Steel AISI 1066 with a conventional surface grinder and a corundum grinding wheel, and research was conducted to probe into structures and properties of the hardened layer under varied depth of cut and cooling conditions. Results show that the hardened layer do not change noticeably in their martensitic structures and micro-hardness, which is ranged between 810870HV; But when the depth of cut increased or the dry grinding technique is adopted, the concentration of martensites and carbonides becomes lower, while the amount of residual austenites increases, and the completely hardened zone gets thicker. This conclusion serves as an experimental basis for the active control of properties of the grind-hardened layer of Steel AISI 1066.

Grinding of Carbon/Epoxy Composites Using Electroplated CBN Wheel with Controlled Abrasive Clusters

2008 ◽  
Vol 389-390 ◽  
pp. 24-29 ◽  
Author(s):  
H.P. Yuan ◽  
Hang Gao ◽  
Yong Jie Bao ◽  
Yong Bo Wu
Keyword(s):  
Epoxy Composite ◽  
Epoxy Composites ◽  
Grinding Wheel ◽  
The Novel ◽  
Grinding Wheels ◽  
Grinding Forces ◽  
Abrasive Grains ◽  
Dry Grinding ◽  
Conventional Grinding ◽  
Wheel Loading

Aiming at solving the problems of wheel loading in dry grinding of Carbon/Epoxy composite materials, a novel electroplated grinding wheel with controlled abrasive cluster was developed, in which the diameter of clusters is in Φ0.2 mm to Φ1.0 mm and the interspace between them is about 0.5 mm to 1.0 mm. A conventional electroplated grinding wheel with abrasive grains distributed randomly was fabricated in the same way. The comparison experiments involving C/E composite were conducted on a vertical spindle grinder with the novel and conventional grinding wheels. The results show that the grinding forces of novel wheel developed is more lower though little larger surface roughness, and the wheel loading phenomenon is markedly decreased compared with conventional electroplated wheel.

Passivation Model of Diamond Grinding Wheel in Constant-Force Grinding of Si3N4 Ceramic

2007 ◽  
Vol 359-360 ◽  
pp. 94-97 ◽  
Author(s):  
Xin Li Tian ◽  
Zhi Yuan Wu ◽  
An Ying She ◽  
Zhong Xiang Hu
Keyword(s):  
Exponential Function ◽  
Regression Equation ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Constant Force ◽  
Scatter Plot ◽  
Evaluation Indicator ◽  
Three Stages ◽  
Grinding Technique ◽  
Grinding Efficiency

Grinding wheel passivation is an inevitable phenomenon during grinding process. It has important guiding significance for the formulation of grinding technique to unveil the passivation rule and generation mechanism. Taking grinding efficiency as evaluation indicator, the passivation curve of grinding wheel during full passivation period under the constant-force grinding condition is established through experiments in this dissertation, which is divided into three stages according to passivation speeds and passivation patters, i.e. early passivation stage, stable passivation stage and sharp passivation stage. Of which, the passivation speed is the slowest but with the highest grinding efficiency in early passivation stage. The change of passivation curve with the time is a process from concave to convex, which is totally different from the wearing process of grinding wheel in this stage. With combination of experiment conditions and wearing characteristics of grinding wheel, the passivation rule and its generation reasons are discussed deeply. Furthermore the exponential function y = abx is adopted to make fitting for passivation curve based on the scatter plot of stable passivation stage and regression equation is derived through the fitting result of origin thus to testify the correctness of the inference.

Experimental Research on Grind-Hardening of 65Mn Steel

2006 ◽  
Vol 505-507 ◽  
pp. 787-792 ◽  
Author(s):  
Ju Dong Liu ◽  
Gui Cheng Wang ◽  
Zhi Wang ◽  
Shu Tian Fan
Keyword(s):  
Surface Modification ◽  
Hardened Layer ◽  
Depth Of Cut ◽  
Grinding Wheel ◽  
Micro Hardness ◽  
Layer Depth ◽  
Cooling Conditions ◽  
Dry Grinding ◽  
Grind Hardening ◽  
Grinding Technique

Grind-hardening was done on 65Mn steel with a conventional surface grinder and a corundum-grinding wheel. Research was conducted to probe into microstructures and properties of the hardened layer under varied depth of cut and cooling conditions. Results show that the hardened layer does not change noticeably in their martensitic structures and micro-hardness, which is ranged between 810-870HV. When the depth of cut increases or the dry grinding technique is adopted, the hardened layer becomes thicker accordingly. Under the condition of dry grinding with the depth of cut 1.0mm, the hardened layer depth reaches 2.0mm. It can find applications in grinding and metal surface modification field.

The method of assessment of the grinding wheel cutting ability in the plunge grinding

2012 ◽  
Vol 2 (3) ◽  
Author(s):  
Krzysztof Nadolny
Keyword(s):  
Working Conditions ◽  
Comparative Assessment ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Grinding Wheels ◽  
Plunge Grinding ◽  
Abrasive Grains ◽  
Ceramic Bond ◽  
Method Of Assessment ◽  
Grinding Kinematics

AbstractThis article presents the method of comparative assessment of the grinding wheel cutting ability in the plunge grinding kinematics. A new method has been developed to facilitate multicriterial assessment of the working conditions of the abrasive grains and the bond bridges, as well as the wear mechanisms of the GWAS, which occur during the grinding process, with simultaneous limitation of the workshop tests range. The work hereby describes the methodology of assessment of the grinding wheel cutting ability in a short grinding test that lasts for 3 seconds, for example, with a specially shaped grinding wheel, in plunge grinding. The grinding wheel macrogeometry modification applied in the developed method consists in forming a cone or a few zones of various diameters on its surface in the dressing cut. It presents an exemplary application of two variants of the method in the internal cylindrical plunge grinding, in 100Cr6 steel. Grinding wheels with microcrystalline corundum grains and ceramic bond underwent assessment. Analysis of the registered machining results showed greater efficacy of the method of cutting using a grinding wheel with zones of various diameters. The method allows for comparative tests upon different grinding wheels, with various grinding parameters and different machined materials.

Research on the Grinding Force of the Basin-Like Grinding Wheel in Grinding Elliptical Grooves of Outer Race

2013 ◽  
Vol 823 ◽  
pp. 143-148
Author(s):  
Xiao Xue Li ◽  
Jun Ming Wang ◽  
Yu Qin Sun ◽  
Zhen Gang Gao
Keyword(s):  
High Speed ◽  
Grinding Force ◽  
The Other ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Feed Velocity ◽  
Outer Race ◽  
Abrasive Grains ◽  
Other Hand

In order to calculate the grinding force of the basin-like grinding wheel in grinding outer race elliptical grooves, the thesis simplifies the grinding process as follow: the evenly distributed abrasive grains move around grinding wheel axis along an imaginary ellipse at high speed, while the imaginary ellipse moves along the trace deflected from the grinding wheel axis simultaneously. The analysis of grinding force in CVJ outer race elliptical groove grinding with basin-like grinding wheel reveals that, the grinding force will be decreased, if wheel velocity increased and feed velocity decreased. On the other hand, with the decrease of inter-grain spacing, the grinding force of basin-like grinding wheel will be increased, but the grinding force of abrasive grit will be decreased.

scholarly journals Automating the Mold-Material Grinding Process

2019 ◽  
Vol 13 (6) ◽  
pp. 722-727
Author(s):  
Takekazu Sawa ◽  
Keyword(s):  
Diamond Wheel ◽  
Mold Material ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Bending Vibrations ◽  
Bending Vibration ◽  
Abrasive Grains ◽  
Metal Materials ◽  
Vibration Noise

Grinding is difficult to control because abrasive grains are scattered randomly on the surface of the grinding wheel, and the quality of the grinding work is strongly dependent on the skill of the operator. Therefore, automation and optimization technologies should be established immediately for grinding, along with other machining work. From this perspective, we observed the bending vibrations of a diamond wheel during a grinding project and developed a technique to identify the grinding condition by using a microphone to measure the small noises from the vibration (called bending-vibration noise in this paper). In this paper, we report the application of the technique to an ordinary grinding wheel, and our attempt to automate the grinding work of STAVAX and SKD11 metal materials.

scholarly journals New Abrasive Materials and Their Influence on the Surface Quality of Bearing Steel After Grinding

10.14311/1598 ◽  
2012 ◽  
Vol 52 (4) ◽  
Author(s):  
Ondrej Jusko
Keyword(s):  
Surface Quality ◽  
Bearing Steel ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Grinding Wheels ◽  
Abrasive Material ◽  
Abrasive Grains ◽  
Measurement Results ◽  
New Type

This paper focuses on the influence of various types of abrasive grains on cutting properties during the grinding process for bearing steel. In this experiment, not only conventional super-hard abrasive materials but also a new type of abrasive material were employed in grinding wheels. The measurement results were compared, and an evaluation was made of the cutting properties of the new abrasive material. The options were then evaluated for their practical applicability. The measurement results indicated that a grinding wheel with Abral and SG grains is the most suitable for grinding hardened bearing steel in order to achieve the best roughness and geometrical accuracy.

Development of Three-Dimensional Measurement System of a Grinding Wheel Surface with Image Processing

2011 ◽  
Vol 325 ◽  
pp. 294-299 ◽  
Author(s):  
Akihiro Sakaguchi ◽  
Tomoyuki Kawashita ◽  
Shuji Matsuo
Keyword(s):  
Image Processing ◽  
Measurement System ◽  
Three Dimensional ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Wheel Surface ◽  
Dimensional Measurement ◽  
Abrasive Grains ◽  
Three Dimensional Measurement ◽  
The One

Grinding process is a very efficient machining technology because innumerable abrasive grains are fixed on the surface of grinding wheel. Especially, the distribution and shape of cutting edges which directly affect grinding process have a big influence on accuracy. Thus, it is very important to measure a wheel surface topography from a viewpoint of evaluating the wheel life and the performance and a relation between the one and the roughness. In this study, a three-dimensional measurement system of a grinding wheel surface with image processing is developed. In this system, the distribution and height of cutting edges are analyzed because only cutting edges can be selected from among all abrasive grains.

An Investigation into Integrate the Surface Hardening with the Grinding Precision Finishing

2009 ◽  
Vol 407-408 ◽  
pp. 560-564
Author(s):  
Ya Li Hou ◽  
Chang He Li ◽  
Yu Cheng Ding
Keyword(s):  
Surface Hardening ◽  
Cubic Boron Nitride ◽  
Experimental Results ◽  
Grinding Wheel ◽  
Work Piece ◽  
Surface Layers ◽  
Treatment Technology ◽  
Dry Grinding ◽  
Cbn Grinding Wheel ◽  
Grinding Hardening

The grinding hardening is a new surface heat treatment technology using grinding heat in which induce martensitic phase transformation in the surface layers of annealed or tempered steels to achieve surface strengthening processes and integrate the surface hardening process with the grinding precision machining. In the paper, a thermal model to describe this process has been presented from the thermal partition modeling and has been used to predict subsurface time–temperature profiles in the dry cylindrical grinding crankshaft using cubic boron nitride (CBN) wheels. The grinding hardening experiment was carried out in precision cylindrical grinder M1420E, using work-piece material 42CrMo4 and CBN grinding wheel under dry grinding condition. The experimental results showed the theoretical model is agreement with experimental results and the model can well forecast the grinding hardening depths.

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