Roller Burnishing Tool

Abstract: this paper mainly Presents the process parameters, Engineering and operation of rolling tool in order to improve the smoothness of products. Through the introduction of this article to describe how to enhance the surface of the workpiece after rolling pressure, the surface of the workpiece isn’t clean, the hints of rolling, etc.

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

1.

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

Abrasion resistance increased by 15%;

Fatigue limit increased by 30%;



The measurement tolerance can be reduced by 10-15% by diameter calculation.

The surface roughness may reach above Ra0.2 if The overfill is suitable and matches with other procedure parameters.

After rolling are smoothed, and Roller Burnishing Tool with sealing materials is smooth, which reduces the usage of sealing components while reducing the wear of merchandise. Concerning processing efficiency, 1 roll can complete the processing. (finishing 100 x 300 holes in 1.5 minutes can be finished; completing 30 x 40 holes in 10 seconds can be finished ).

2. Process parameters and requirements



1) Burnishing
Amount: if machining the inner hole of the workpiece using the roller burnishing tool, the tool diameter is defined to be slightly bigger than the previous machining size, rotating and feeding the instrument (workpiece), and rolling the internal hole. The gap value between the diameter of the tool and also the dimensions of the workpiece before processing is known as burnishing amount.

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

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

3) The upper limit of hardness of workpiece

4) In order to avoid the deformation of thin Wall parts during rolling, the wall thickness of the machining part should reach more than 15% to 20% of their aperture.

At exactly the same time, when the hardness of projecting materials isn’t uniform, then the surface defects of rolling pressure is going to be exposed instantly. Hence, the standard of the rolled parts is good, and the surface defects should not be too many.

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

Clean machine acrylic or sterile with petrol oil (ratio 3:7), or with special lubricating fluid provided by the manufacturer. A great deal of lubricating fluid should be utilized because the lubricating fluid needs to clear the little metal powder produced in the rolling process. Maintain the lubricating fluid sterile, pay attention to dust prevention and filtration.

8) Rolling effect is closely linked to the Previous process. Following the current process, if the surface is too concave and Convex, the rolling pressure will also increase, and also the feed amount will be Reduced, therefore the rolling effect will not be ideal. It’s recommended to pay Focus on the machining precision from the procedure before rolling, and pay Focus on cleaning at the same time to avoid the chip sticking into the inner Wall of cylinder body.