A Method for Reducing the Corner Wear in Plunge Grinding

1986 ◽  
Vol 200 (1) ◽  
pp. 19-26 ◽  
Author(s):  
V Radhakrishnan ◽  
B T Achyutha
Keyword(s):  
Grinding Forces ◽  
Plunge Grinding ◽  
Cylindrical Grinding ◽  
Remarkable Improvement ◽  
Corner Radius ◽  
Grinding Operations ◽  
Grooved Wheel

There are many cylindrical grinding operations like crankshaft grinding in which the corner radius is critical and hence, the corner wear is important. Studies with a patented side-grooved wheel have shown a remarkable improvement in the performance of the wheel. With the side-grooved wheel, there was reasonable reduction in grinding forces, wheel corner wear and glazing tendencies. This paper deals with a detailed investigation on the performance of side-grooved wheels in cylindrical plunge grinding applications.

Corner Wear and Its Monitoring in Cylindrical Plunge Grinding

1987 ◽  
Vol 109 (3) ◽  
pp. 309-314
Author(s):  
V. Radhakrishnan ◽  
B. T. Achyutha
Keyword(s):  
Significant Role ◽  
Grinding Wheel ◽  
Tolerance Zone ◽  
Airflow Velocity ◽  
Plunge Grinding ◽  
Corner Radius ◽  
Grinding Operations

Grinding wheel corner wear plays a very significant role in certain cylindrical plunge grinding operations in which the corner radius is critical. The corner wear affects the tolerance specified on the plunged corner radius on the component. Monitoring of corner wear is essential to know when exactly the tolerance zone has been crossed. This paper deals with the nature and geometry of corner wear and its monitoring using the fluctuations in the airflow velocity around the grinding wheel.

A Computer Program Design for Optimization of a Cylindrical Traverse Grinding Operations

2009 ◽  
Vol 147-149 ◽  
pp. 387-392
Author(s):  
Andrejus Henrikas Marcinkevičius
Keyword(s):  
Computer Program ◽  
Program Design ◽  
Task Complexity ◽  
Process Plan ◽  
Cylindrical Grinding ◽  
Grinding Operations ◽  
Manual Calculation ◽  
Traverse Grinding

Traverse cylindrical grinding productivity and accuracy depend on many factors of rough, fine and spark out grinding. Evaluation of all these factors at manual calculation of the process plan is impossible, for that reason the engineer technologist selects the cutting rates approximately, and they are far from optimal. We have deduced equations for calculation of optimal cutting rates for that purpose. Because of task complexity the computer program was designed for calculations which is described in this paper.

Development of a Forecasting Compensatory Control System for Cylindrical Grinding

1987 ◽  
Vol 109 (4) ◽  
pp. 385-391 ◽  
Author(s):  
K. H. Kim ◽  
K. F. Eman ◽  
S. M. Wu
Keyword(s):  
Control System ◽  
Substantial Improvement ◽  
Error Source ◽  
Mechanical Motion ◽  
Cylindrical Grinding ◽  
Radial Error ◽  
Electric Drive System ◽  
Compensatory Control ◽  
Grinding Operations ◽  
Error Motion

A forecasting compensatory control (FCC) system was developed to improve workpiece roundness in cylindrical grinding operations. The spindle radial error motion (SREM) at the grinding position, identified as the dominant error source was modeled by an autoregressive model and compensated for by a forecasting algorithm. A digital method for measuring SREM at the grinding position which incorporates master roundness compensation was proposed and a piezo-electric drive system for the generation of the compensatory mechanical motion was developed. The implementation of the proposed method resulted in a substantial improvement of workpiece roundness.

Cylindrical Grinding by Structured Wheels

2016 ◽  
Vol 874 ◽  
pp. 101-108 ◽  
Author(s):  
Amir Daneshi ◽  
Bahman Azarhoushang
Keyword(s):  
Surface Roughness ◽  
Ground Surface ◽  
Promising Method ◽  
Grinding Wheel ◽  
Grinding Wheels ◽  
Grinding Forces ◽  
Cylindrical Grinding ◽  
Dry Grinding

Structuring of the grinding wheels is a promising method to reduce the forces involved in grinding, especially during dry grinding. In this paper, one of the methods of grinding wheel structuring is presented. The structuring process was modeled to find the corresponding dressing parameters for the desired structure dimensions. The cylindrical grinding operation with the structured wheels was simulated to produce a spiral free ground surface. Afterwards, the dry grinding experiments with the structured and non-structured wheels were carried out to evaluate the efficiency of the structured wheels. The results revealed that the grinding forces can be reduced by more than 50% when the grinding wheels are structured, while the surface roughness values increase by 80%.

scholarly journals OPTIMUM WORKHOLDING CONDITIONS FOR PRECISION CYLINDRICAL GRINDING OPERATIONS

10.6036/10160 ◽  
2021 ◽  
Vol 96 (6) ◽  
pp. 627-632
Author(s):  
LEIRE GODINO FERNANDEZ ◽  
JORGE ALVAREZ RUIZ ◽  
JOSU CASAS GAYUBO ◽  
JOSE ANTONIO SANCHEZ GALINDEZ
Keyword(s):  
Critical Issue ◽  
Grinding Process ◽  
Important Process ◽  
Cylindrical Grinding ◽  
Safety Coefficient ◽  
Resistance Torque ◽  
Cylindrical Workpiece ◽  
Grinding Operations ◽  
Non Destructive ◽  
Correct Design

Grinding process is a very important process in machining industry being one of the most popular processes when high quality parts must be manufacture. Likewise, workholding is a critical issue on cylindrical grinding. The use of the driving dog is common when the workpiece is held between centers. However, one of the handicaps of this workholding is that the cylindrical workpiece cannot be ground along the complete length. In order to tackle this issue, in the present work the workpiece is held between centers avoiding the use of the driving dog. To this end, a methodology to obtain the grinding limit parameters that ensure that the transmitted torque is higher that the resistance torque is presented, being the aim of these tests is to avoid the sliding between the point and the workpiece. Finally, non-destructive tests are designed, which, using a safety coefficient of about 0.77, the tests allow the correct design of each specific grinding process. Keywords: cylindrical grinding, workholding, driving dog, sliding

In-process detection of grinding wheel truing and dressing conditions using a flapper nozzle arrangement

1997 ◽  
Vol 211 (5) ◽  
pp. 335-343 ◽  
Author(s):  
T M A Maksoud ◽  
A A Mokbel ◽  
J E Morgan
Keyword(s):  
Surface Topography ◽  
Ground Surface ◽  
Grinding Wheel ◽  
Grinding Forces ◽  
Accurate Identification ◽  
Wheel Topography ◽  
On Line ◽  
Sharp Edges ◽  
Process Detection ◽  
Grinding Operations

The spatial distribution of sharp cutting edges around the active periphery of a grinding wheel has an important effect on the surface finish of ground components. In addition, random protrusion of sharp edges can result in a random distribution of grinding forces acting on the ground surface. A uniformly dressed and accurately trued wheel is essential for successful grinding. Since these conditions will alter during use, monitoring of them during grinding must be a requirement for critical grinding operations. This paper describes a new system for achieving on-line detection of the grinding wheel condition. The system uses a small air flapper nozzle-transducer arrangement which detects in-process changes of the grinding wheel surface topography, where external triggering of the data-acquisition system ensures a highly accurate identification of the wheel's surface topography irrespective of wheel speed. The benefits of this system are illustrated by experimental results that correlate the measurement of wheel topography by two means: flapper nozzle and stylus.

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.

The prediction of grinding forces in cylindrical plunge grinding

1986 ◽  
Vol 24 (1) ◽  
pp. 167-186 ◽  
Author(s):  
E. R. FIELDING ◽  
T. J. VICKERSTAFF
Keyword(s):  
Grinding Forces ◽  
Plunge Grinding
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