Roller Burnishing Tool

Abstract: this paper mainly Presents the process parameters, Technology and operation of rolling tool so as to improve the smoothness of products. Through the introduction of this guide to describe how to enhance the surface of the workpiece after rolling strain, the top layer of the workpiece isn’t clean, the traces of rolling, and so on.

Before That the roller burnishing tool was widely used, many manufacturers used polishing, honing, grinding and other techniques to improve the surface finish of metal goods in the machining process. The honing procedure also has certain advantages. For many inner holes with high hardness and small bore diameter, the honing tool can be used to finish the honing procedure, but its efficiency is much lower than that of the roller burnishing tool.

1.

First of Roller Burnishing Tool , after outside rolling, the Surface of metal workpiece is reinforced, the best strength and yield point are raised, along with the hardness can be increased by 15-30%.

Abrasion resistance improved by 15 percent;

Fatigue limit improved by 30%;

10-15percent by diameter calculation.

The surface roughness may attain over Ra0.2 if The overfill is appropriate and fits with other process parameters.



Secondly, the surface micro-protuberances After rolling are smoothed, and the touch with sealing substances is smooth, which lessens the usage of sealing parts while reducing the usage of merchandise. In terms of processing efficiency, 1 roll can complete the processing. (completing 100 x 300 holes at 1.5 minutes could be finished; finishing 30 x 40 holes in 10 seconds can be finished ).

2. Procedure parameters and requirements

Level : when machining the inner hole of the workpiece using the roller burnishing tool, the tool diameter is set to be slightly larger than the preceding machining size, rotating shaft and feeding the tool (workpiece), and rolling the inner hole. The difference value between the diameter of the tool and the dimensions of the workpiece before processing is known as burnishing amount.

The burnishing amount is set according to this Material and wall thickness. The setting of burnishing amount is usually 3 to 5 days of their surface roughness prior to processing, which is ideal. When the burnishing level range of steel and cast iron components is 0.04~0.07mm, then its own inner diameter won’t change.

Dimensions : as the diameter size will change after rolling, the machining allowance should be left before rolling to ensure the dimensional tolerance. The variant of diameter and size is influenced by the material, hardness and adjusting pressure of the workpiece, etc., so the conclusion of machining allowance should be made on the basis of the company’s reference value after many trials. It must be noted that the inner diameter can’t be enlarged to the same size as the diameter of the tool after rolling, because the enlarged inner diameter is reduced following the tool passes through as a result of elastic recovery of this substance.

3) The top limit of hardness of workpiece

4) so as to avoid the deformation of lean Wall parts during rolling, the wall thickness of the machining part should reach more than 15 percent to 20% of the aperture.

At exactly the exact same time, when the hardness of casting materials is not uniform, then the surface defects of rolling pressure is going to be exposed instantly. Therefore, the quality of the rolled parts is great, and the surface flaws shouldn’t be too many.

6) The effect of primary rolling is greatest, and The roughness can be reduced from 2-3 grades.

Clean machine oil or sterile with diesel oil (ratio 3:7), or using special lubricating fluid offered by the manufacturer. A great deal of lubricating fluid ought to be utilized because the lubricating fluid needs to clear the little metallic powder produced from the rolling procedure. Maintain the lubricating fluid sterile, listen to dust prevention and filtration.

8) Rolling result is closely related to the Previous procedure. Following the current process, if the surface is too concave and Convex, the rolling pressure will also grow, and also the feed amount will be Reduced, therefore the rolling result won’t be ideal. It is recommended to cover Focus on the machining precision in the process before rolling, and pay Attention to cleaning at precisely the same time to prevent the chip sticking into the interior