Roller Burnishing Tool

Abstract: this paper mainly Presents the Procedure parameters, Technology and operation of rolling instrument in order to enhance the smoothness of products. During the introduction of this article to explain how to enhance the surface of the workpiece after rolling strain, the surface of the workpiece isn't clean, the traces of rollingup, etc.

Before The roller burnishing tool was widely used, many manufacturers used polishing, polishing, grinding and other techniques to enhance the surface finish of metal products in the machining procedure. The honing process also has specific benefits. For some inner holes with higher hardness and little bore diameter, the honing tool can be used to complete the honing procedure, but its efficacy is a lot lower than that of the roller burnishing tool.

1. Processing effect

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

Abrasion resistance increased by 15 percent;

Fatigue limit increased by 30 percent;

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

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

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

2. Process parameters and requirements

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

The burnishing level is set based on this Fabric and wall thickness. The setting of burnishing level is usually 3 to 5 days of their surface roughness prior to processing, which can be ideal. After the material is steel, the burnishing level ranges from 0.04 to 0.07mm to obtain the most perfect surface. As soon as the burnishing amount assortment of steel and cast iron parts is 0.04~0.07mm, its own inner diameter will not change.

2) Preprocessing
Dimensions : since the diameter dimensions will alter after rolling, the machining allowance ought to be left before rolling to guarantee the dimensional tolerance. The variant of diameter and size is affected by the material, hardness and adjusting strain of the workpiece, etc., so the conclusion of machining allowance should be made on the basis of the company's reference value after several trials. It must be noted that the inner diameter cannot be expanded to the identical size as the diameter of the tool after adjusting, because the enlarged inner diameter is reduced following the instrument passes through as a result of elastic recovery of this substance.

3) The upper limit of hardness of workpiece

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

5) The roughness of this preprocessed surface  At exactly the exact same time, when the hardness of projecting materials is not uniform, then the surface defects of rolling pressure is going to be exposed immediately. Therefore, the quality of the rolled parts is good, and the surface flaws shouldn't be too many.

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

Clean machine acrylic or sterile with diesel oil (ratio 3:7), or with special lubricating fluid provided by the manufacturer. A large amount of lubricating fluid ought to be used cause the lubricating fluid needs to clear the small metallic powder produced in the rolling process. Keep the lubricating fluid clean, listen to dust prevention and filtration.

8) Rolling result is closely linked to this Previous procedure. Convex, the rolling strain will also grow, and also the feed amount will be Reduced, so the rolling result won't be ideal. Roller Burnishing Tool 's Suggested to pay Focus on the machining precision from the process before rolling, and pay Attention to cleaning at the exact same time to avoid the chip sticking into the interior 

30.05.2018 22:38:18

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