Kinematic Analysis of Face Grinding Process at Lapping Machines

Author(s):  
L.X. Cao ◽  
H.J. Wu ◽  
J. Liu
Author(s):  
Mahmoud M. Rababah ◽  
Zezhong C. Chen

Grinding the helical surfaces in end-mill cutters using two-axis CNC machines is well investigated in literature. However, the grinding wheels do not have explicit geometric representations and the produced helical angles differ from the designed values. Moreover, to the best knowledge of the authors, no reliable and robust algorithm exists to grind generic shape cutters with constant normal rake angles. Thus, the first part of this work introduces a five-axis grinding process that keeps the normal rake angle constant along the rake face. The parameters that affect the shape of the tool flutes are also analyzed and studied in this part. These parameters are then optimized in the second part to obtain optimum wheel shapes grinding the tool flutes along optimum paths. Overall, the grinding process proposed grinds the tool flutes with close matching to the designed ones and replaces the complex wheel shapes commonly used by simple prismatic ones.


2005 ◽  
Vol 291-292 ◽  
pp. 145-150
Author(s):  
L.X. Cao ◽  
H.J. Wu ◽  
J. Liu

The precise face grinding and lapping technology with abrasive or abrasive tool has been widely used in the field of the precise manufacture and ultraprecise manufacture. It has become an essential technology in the manufacture of many components. The planetary lapping machine is typical equipment for face grinding or lapping process. And the relative motions between the workpieces and grinding wheel will affect the formation of wear profiles of the tools, furthermore, the work result will be affected directly by the cutting path of this relative motions. In this paper, the kinematic principle of face grinding process on lapping machines has been analyzed. By means of the concept of pitch point and pitch circles, the complicated grinding process has been converted into two kinds of rotations with the fixed center distance. Two kinds of path curves, i.e. workpiece against grinding wheel and grinding wheel against workpiece, and their relations are analyzed. The geometrical analyses and the manufacture quality of the workpiece are linked with the aid of the cutting velocity, the range of the rotational angle of the cutting traces and the rate of the change of the rotational angle with time. The optimal path curve and kinematic parameters are achieved, and these results are corresponding to the experimental results.


Mechanik ◽  
2017 ◽  
Vol 90 (10) ◽  
pp. 900-902
Author(s):  
Rafał Świercz ◽  
Józef Zawora ◽  
Lucjan Dąbrowski ◽  
Mieczysław Marciniak

The investigation has been carried out into the effect of modifying the active wheel surface structure in view of enhancing productivity of the grinding process. This undertaking should be consistent with standard surface roughness requirements. This modification involves the model-based shares of the two SiC grain grit sizes and two CrA grit sizes in the grinding pins with ceramic bond for the face grinding process.


Author(s):  
И. Никитина ◽  
I. Nikitina ◽  
А. Поляков ◽  
A. Polyakov

The paper proposes a methodology for experimental studies of double-sided face grinding machines on the criterion of heat resistance, including: method of simulating a grinding process; measurement of temperature; measurement of changes in relative angular position of the circles; the measurement of processing errors. The proposed methods for experimental studies of the thermal behavior and errors in the machining of a double-sided face grinder allow for fine-tuning of the machine under production conditions. At the same time, preliminary tests of a double-sided face grinder show that when grinding an industrial batch of cylindrical rollers, excessive temperatures are distributed unevenly across the machine nodes both at idle and during grinding. The ends of the spindle heads and the stand have the greatest excess temperature when working at idle, and when grinding - on the surface of the machine, located in close proximity to the grinding zone. The nature of changes in excess temperatures of characteristic points and coolant when simulating the grinding process on the machine completely coincided with the experimental data obtained on a working machine.


2021 ◽  
Vol 4 (1) ◽  
pp. 166-177
Author(s):  
Magdalena Palacz ◽  
Tatiana N. Ivanova ◽  
Alexander M. Kozlov ◽  
Wojciech Kaniak

Abstract In current conditions, great attention is paid to the quality of parts, which is in many ways determined by finishing operations of mechanical treatment, with surface grinding being the most widespread. Grinding process efficiency, abrasive tool wear intensity, machined surface quality and other features of grinding process depend on properties of the environment, where the cutting process takes place. Forced changing of conditions of this environment is one of the ways to control and optimize the grinding process, which can be reached due to finding new technological decisions. One of the most promising directions to solve this problem is the process of face grinding with discontinuous grinding tool and supply of cooling fluid or air in the cutting zone directly. Carried analysis of features of face grinding has shown that heat density can be decreased by the usage by grooved wheels with vortex air cooling or by supply of cooling-lubricant technological fluid. Obtained dependences of temperature field of part surface during grinding establish the influence of the length of working shoulders and grooves, vortex tubes number, outflow rate, temperature and flow rate of cold vortex flow of air. These data provide conscious control over the process of discontinuous face grinding by changing wheel grain size and grinding speed.


CIRP Annals ◽  
1999 ◽  
Vol 48 (1) ◽  
pp. 281-284 ◽  
Author(s):  
E. Uhlmann ◽  
T. Ardelt ◽  
G. Spur

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