Abstract: this paper mainly Presents the process parameters, Technology and operation of rolling tool so as to improve the smoothness of merchandise. During the introduction of this article to explain how to enhance the surface of the workpiece after rolling pressure, 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 factories utilized polishing, polishing, grinding and other techniques to enhance the surface finish of metal goods in the machining process. The honing procedure also has specific advantages. For Roller Burnishing Tool with high hardness and small bore diameter, the honing tool is utilized to complete the honing process, but its efficacy is much lower than the roller burnishing tool.

1.

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

Abrasion resistance increased by 15%;

Fatigue limit improved by 30%;



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

The surface roughness can reach above Ra0.2 if The overfill is appropriate and fits with other procedure parameters.

After rolling are smoothed, and the touch with sealing materials is smooth, which reduces the usage of sealing parts while reducing the wear of merchandise. In terms of processing efficiency, one roster can finish the processing. (completing 100 x 300 holes at 1.5 minutes could be finished; completing 30 x 40 holes in 10 minutes can be completed).

2. Procedure parameters and requirements



1) Burnishing
Amount: when 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 tool (workpiece), and rolling the inner hole. The difference value between the diameter of the tool and also the size of the workpiece before processing is called burnishing amount.

The burnishing level is set according to this The setting of burnishing level is generally 3 to 5 days of their surface roughness before processing, which can be ideal. When the material is steel, the burnishing level ranges from 0.04 to 0.07mm to obtain the most ideal surface. As soon as the burnishing amount range of steel and cast iron components is 0.04~0.07mm, its own inner diameter will not change.

Dimensions : since the diameter size will change after rolling, the machining allowance should be left before rolling to guarantee the dimensional tolerance. The variant of diameter and size is affected by the substance, hardness and adjusting strain of the workpiece, etc., so the determination of machining allowance ought to be made on the basis of the manufacturer’s reference value after many trials. It must be mentioned that the inner diameter cannot be enlarged to the same size as the width of the tool after adjusting, cause the enlarged inner diameter is decreased after the instrument passes through as a result of elastic recovery of this substance.

3) The top limit of hardness of workpiece

4) In order to avoid the deformation of lean Wall components 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 flaws of rolling pressure will be exposed immediately. Hence, the quality of the wrapped parts is good, and also 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.



7) The rolling process is lubricated with
Clean machine oil or lubricated with petrol oil (ratio 3:7), or with special lubricating fluid provided by the manufacturer. A large amount of lubricating fluid should be used because the lubricating fluid should clear the little metal powder produced from the rolling process. Keep the lubricating fluid clean, pay attention to dust filtration and prevention.

8) Rolling effect is closely linked to this Previous procedure. Following the current process, if the surface is too concave and Convex, the rolling strain will also grow, and also the feed quantity will be Reduced, therefore the rolling result will not be ideal. It’s Suggested to cover Focus on the machining precision from the process before rolling, and pay Attention to cleaning in the same time to avoid the chip sticking into the interior Wall of cylinder body.