Roller Burnishing Technology
The roller burnishing is a method to make the workpiece, which has passed through the pre-machining, smooth and hard. It is possible to process any kind of material by using this method. The roller burnishing is done by ensuring the roller(s), which was produced by considering this technology, to be contacted the surface of the workpiece by means of a precious mechanism. When such contact is ensured, the workpiece or the roller is required to turn at a specified speed then the roller should go forward on the roller surface. In addition, it should apply a stress on the surface of the workpiece with a certain force thus the process of roller brushing is achieved.
The effects that occur at the point where a sole roller contacted the surface of the workpiece are as follows;
The contact of roller to the workpiece is ensured by a pressure. At this point, while the uneven sections parts are being pressed, the gaps in bottom are filled up simultaneously. This process that we called as plastic deformation is repeated as long as the rotation, pressing and progressing continue (fig.1). Therefore the smooth and bright surfaces are obtained.
The progressing speed of the roller and the pressure to be applied on the workpiece is adjusted according to the surface roughness in questions. The roughness values decrease in parallel to the decreased progressing speed by increasing the pressure. On the contrary, while the pressure is decreasing and the speed of progressing increases, the surface roughness values will increase.
The workpiece exposes to the dimensional change following the roller burnishing. Such change is equal to the roughness amount on the surface. So it is possible to say that such change occurred in the shape and dimension of the workpiece remains inside the roughness limits.
Fig.1 - Roller Burnishing Process
Advantages of roller burnishing
-The surfaces in quality of Rz< 1µm and below can be obtained.
-It is possible to catch the desired size easily and rapidly.
-The process is completed at one stage. The duration of process is measured with seconds instead of minutes.
-While the pressing action burnishes the surface, it hardens the surface. It ensures the processed surface became stronger and more brilliant.
-Such burnishing process makes the workpiece and other components on the surface of work piece didn't wear away easily.
-It saves the time, money and energy.
-No sawdust and sawdust wastes occurred. No noise and damage to the environment.
-No neeed for any additional equipment thanks to simple and practical connection specification.
-It can be used with all Universal and CNC machines.
-Tools have rather long life. It is possible to use the tools for the long time without the size changes due to abrasion.
-It requires low lubrication and cooling.
Pre-machining of workpiece
Tools are capable to burnish all kinds of material up to the hardness of 45 C degree Rockwell. The burnishing tools do not break the piece off only the roughness on the surface is accumulated onto each other. Therefore the roller burnishing tolerance Ø (mm) becomes equal to roughness depth (Rz). The roughness depth in pre-machining can be selected between Rz=5 µm and Rz=50 µm depending on the material type.
The most appropriate pre-machining lathening formula to be used to obtain the most appropriate surface for the process of roller burnishing is as given as follows.
Feed rate per revolution (mm/rev.) = 0.5 x cutter radius (mm) |
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The work piece following such pre-machining becomes ready for roller burnishing process. The surface roughness can be removed after such roller burnishing process. (Fig.2) |
Available machines
YAMASA roller burnishing tools can be used on drilling machines, universal and CNC machines, machining centers, transfer lines and special machines.
Available surfaces
Such process method can be used in cylindrical holes, cylindrical outer surfaces, interior-outer conic and flat surfaces.
Samples of Application > |
