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Roller Burnishing Tool

Ngày đăng: 31-05-2018 03:40:35

Abstract: this paper mainly introduces the process parameters, Technology and operation of rolling instrument so as to improve the smoothness of products. Through the introduction of this guide to explain how to improve the surface of the workpiece after rolling strain, the surface of the workpiece is not clean, the traces of rolling, and so on.

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

1.

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

Abrasion resistance improved by 15%;

Fatigue limit improved by 30 percent;



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

Roller Burnishing Tool may reach above Ra0.2 if The overfill is appropriate and fits with other process parameters.

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

2. Procedure parameters and requirements

Level : when machining the internal hole of the workpiece with 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 internal hole. The gap value between the width of the tool and 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 generally 3 to 5 times of the surface roughness prior to processing, which is ideal. When the burnishing amount assortment of steel and cast iron components is 0.04~0.07mm, then its internal diameter won't change.



2) Preprocessing
Dimensions : since the diameter dimensions will alter after rolling, the machining allowance should be left before rolling to ensure the dimensional tolerance. The variant of diameter and size is influenced by the substance, hardness and adjusting strain of the workpiece, etc., so the conclusion of machining allowance should be made on the basis of the manufacturer's reference value after many trials. It should be mentioned that the inner diameter can't be enlarged to the identical size as the width of the tool after adjusting, cause the enlarged inner diameter is decreased after the instrument passes through due to the elastic recovery of this material.

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

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



5) The roughness of the preprocessed surface Is less than Ra3.2. At the same time, once the hardness of casting materials is not uniform, then the surface flaws of rolling pressure is going to be exposed instantly. Hence, the quality of the rolled parts is good, and also the surface flaws should not be too many.

6) The result of main rolling is greatest, and The roughness can be reduced from 2 to 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 used cause the lubricating fluid needs to clean the little metal powder produced from the rolling process. Keep the lubricating fluid sterile, listen to dust prevention and filtration.

8) Rolling result is closely linked to this Previous process. Convex, the rolling pressure will also increase, and the feed amount will be Reduced, therefore the rolling result won't be ideal. It's recommended to pay Focus on the machining precision in the process before rolling, and cover Attention to cleaning at precisely the same time to avoid the chip sticking into the inner

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