Influence of the abrasive grain trajectory on the machining of thin-walled cylinder liners of internal combustion engines with variable kinematics of honing

Abstract

Honing with variable kinematics has a number of advantages in comparison to traditional honing [1-19], such as less tool wear [12, 13], lower processing temperature [13], better surface quality [12, 13] and less deviation of cylindricity [13]. The article discusses the influence of the variable kinematics on the machining process.

Influence of Honing Parameters on the Quality of the Machined Parts and Innovations in Honing Processes

“…Both traditional rectilinear paths as well as paths with varying inclination angles are observed. Honing with variable kinematic parameters can be an element influencing the further development of CNC machine tools used for honing [165]. One of the possibilities of implementation in the industry is to add the option of generating a grain path according to a specific mathematical formula to the traditional control of CNC machine tools, the form of which would be the result of the analysis of the machining system, wall thickness, method of mounting the honed workpieces, etc.…”

The Proposition of an Automated Honing Cell with Advanced Monitoring

“…Some of the grains are too weak in a given plane to transfer cutting forces, so that new cutting edges are constantly created during the honing process. Changing the direction of grain work also prevents the deposition of the processed material particles on the grain working surfaces; because of this phenomenon the change of the direction of the velocity vector V c , i.e., variable honing kinematics, is an important parameter influencing the course of the process [5][6][7][8] and reduces the friction coefficient in the piston-cylinder assembly [80,82,84,85]. The value of normal acceleration a n is responsible for the change of the vector V c direction and the trajectory curvature.…”

“…processed material particles on the grain working surfaces; because of this phenomenon the change of the direction of the velocity vector Vc, i.e., variable honing kinematics, is an important parameter influencing the course of the process [5][6][7][8] and reduces the friction coefficient in the piston-cylinder assembly [80,82,84,85]. The value of normal acceleration an is responsible for the change of the vector Vc direction and the trajectory curvature.…”

“…The occurrence of different values of heat flux is clearly noticeable, depending on the thickness of the section of honed workpiece. The differences affect the non-uniform cylindrical deformation, more information is included in [5][6][7][8]. The simulation will provide information about the size of deformation for various possible variants of machining parameters, e.g., the amount of pressure of the abrasive whetstone on the workpiece.…”

“…The honing process heats the workpiece and raises its temperature. Specialist literature dealing with the honing process of cylindrical surfaces draws attention to the issue of the temperature increase during machining [1][2][3][4][5][6][7][8][9][10][11], which causes the thermal deformation of the honed hole. The temperature increase is also a very important issue during the honing process of flat surfaces by grinding with lapping kinematics as shown in [12].…”