ROLLER BURNISHING TOOL

Abstract: this paper mainly Presents the Procedure parameters, Engineering and performance of rolling instrument so as to improve the smoothness of products. Through the introduction of this article to explain how to improve the surface of the workpiece after rolling pressure, the surface of the workpiece is not clean, the traces of rolling, and so on.

Before The roller burnishing tool was widely used, many factories used polishing, honing, grinding and other techniques to improve the surface finish of metal goods in the machining procedure. The honing process also has specific benefits. For many internal holes with high hardness and small bore diameter, the honing tool is utilized to finish the honing process, but its efficacy is much lower than the roller burnishing tool.

1. Processing effect



First of all, after surface 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 dimension tolerance can be reduced by 10-15% by diameter calculation.

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

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, 1 roll can complete the processing. High production efficiency. (completing 100 x 300 holes in 1.5 minutes could be finished; finishing 30 x 40 holes in 10 seconds can be finished ).

2. Process parameters and requirements

Amount: when machining the inner hole of the workpiece with the roller burnishing tool, the tool diameter is defined to be slightly larger than the previous machining size, rotating shaft and feeding the instrument (workpiece), and rolling the inner hole. The difference value between the diameter of the tool and also the dimensions of the workpiece before processing is known as burnishing amount.

The burnishing amount is set according to this The setting of burnishing level is usually 3 to 5 times of their surface roughness before processing, which is ideal. After 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 level range of steel and cast iron parts is 0.04~0.07mm, then its inner diameter won’t change.



2) Preprocessing
Size: since the diameter size will alter after rolling, the machining allowance ought to be left before rolling to guarantee 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 manufacturer’s reference value after several trials. It should be noted that the inner diameter can’t be expanded to the same size as the width of the tool after adjusting, cause the enlarged inner diameter is reduced after the instrument passes through as a result of elastic recovery of the material.

3) The upper limit of hardness of workpiece Processed by roller burnishing tool is HRC40.

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% to 20% of their aperture.



5) The roughness of this preprocessed surface At exactly the same time, once the hardness of projecting materials is not uniform, then the surface defects of rolling pressure will be exposed immediately. Therefore, the quality of the wrapped parts is good, and also the surface defects shouldn’t be too many.

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

Clean machine acrylic or lubricated with petrol oil (ratio 3:7), or using special lubricating fluid provided by the manufacturer. A large amount of lubricating fluid should be utilized because the lubricating fluid needs to clear the little metallic powder produced from the rolling process. Maintain Roller Burnishing Tool , listen to dust filtration and prevention.

8) Rolling result is closely related to this Previous process. After the present 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 won’t be ideal. It’s recommended to pay Focus on the machining precision from the process before rolling, and pay Focus on cleaning at precisely the exact same time to avoid the chip sticking to the interior