Abstract: this paper mainly Presents the process parameters, Technology and operation of rolling tool so as to improve the smoothness of merchandise. Through the introduction of this guide to explain how to improve the surface of the workpiece after rolling pressure, the surface of the workpiece is not clean, the hints of rolling, and so on.

Before The roller burnishing tool was widely used, many factories utilized polishing, honing, grinding and other methods to improve the surface finish of metal products in the machining process. The honing procedure also has specific advantages. For some inner holes with higher hardness and small bore diameter, the honing tool is utilized to finish the honing process, but its efficacy is much lower than that of the roller burnishing tool.

1. Processing effect



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

Roller Burnishing Tool increased by 15 percent;

Fatigue limit increased by 30%;

10-15% by diameter calculation.

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



Secondly, the surface micro-protuberances After rolling are smoothed, and the contact with sealing substances is smooth, which reduces the wear of sealing parts while reducing the wear of products. Concerning processing efficiency, one roster can finish the processing. High production efficiency. (finishing 100 x 300 holes at 1.5 minutes could be finished; completing 30 x 40 holes in 10 minutes can be finished ).

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 gap value between the diameter of the tool and also the size of the workpiece before processing is known as burnishing amount.

The burnishing amount is set based on the The setting of burnishing amount is usually 3 to 5 days of their surface roughness before processing, which can be ideal. After the material is steel, the burnishing level ranges from 0.04 to 0.07mm to acquire the most ideal surface. When the burnishing amount range of steel and cast iron parts is 0.04~0.07mm, its own internal diameter will not change.

Size: since the diameter dimensions will alter after rolling, the machining allowance ought to be left before rolling to ensure the dimensional tolerance. The variant of diameter and diameter is affected by the substance, hardness and adjusting pressure of the workpiece, etc., so the determination of machining allowance should be made on the basis of the manufacturer's reference value after several trials. It should be noted that the inner diameter cannot be expanded to the same size as the width of the tool after rolling, cause 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 Processed by roller burnishing tool is HRC40.

4) In order to avoid the deformation of lean Wall parts during rolling, the wall thickness of the machining part should achieve greater than 15% to 20 percent of their aperture.



5) The roughness of this preprocessed surface Is preferably less than Ra3.2. At the exact same time, once the hardness of projecting materials isn't uniform, the surface flaws of rolling pressure will be exposed immediately. Hence, the quality of the rolled parts is good, and also the surface defects shouldn't be too many.

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

Clean machine oil or lubricated with petrol oil (ratio 3:7), or with specific lubricating fluid offered by the manufacturer. A large amount of lubricating fluid ought to be utilized because the lubricating fluid needs to clean the little metal 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 strain will also grow, and the feed quantity will be Reduced, so the rolling effect will not be ideal. It's Suggested to cover Focus on the machining precision from the process before rolling, and cover Attention to cleaning at the same time to avoid the chip sticking to the interior Wall of cylinder body.