Roller Burnishing Tool

Abstract: this paper mainly introduces the Procedure parameters, Technology and operation of rolling instrument in order to enhance the smoothness of merchandise. During Roller Burnishing Tool of this guide to describe how to improve the surface of the workpiece after rolling pressure, the surface of the workpiece isn’t clean, the hints of rolling, and so on.

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

1.

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

Abrasion resistance improved by 15 percent;

Fatigue limit improved by 30%;



The measurement 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 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. In terms of processing efficiency, one roster can complete the processing. (completing 100 x 300 holes in 1.5 minutes can be completed; finishing 30 x 40 holes in 10 seconds can be completed).

2. Procedure parameters and requirements



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

The burnishing amount is set according to the The setting of burnishing level is generally 3 to 5 times 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. As soon as the burnishing amount assortment of steel and cast iron components is 0.04~0.07mm, its own internal diameter won’t change.

Dimensions : as the diameter dimensions will alter after rolling, the machining allowance should be left before rolling to guarantee the dimensional tolerance. The variation of diameter and size is influenced by the material, hardness and adjusting strain of the workpiece, etc., so the determination of machining allowance should be made on the basis of the company’s reference value after several trials. It should be noted that the inner diameter cannot be enlarged to the identical size as the diameter of the tool after rolling, because the enlarged inner diameter is decreased following the tool passes through as a result of elastic recovery of this substance.

3) The upper limit of hardness of workpiece

4) In order to avoid the deformation of thin Wall components during rolling, the wall thickness of the machining part should reach greater than 15% to 20% of the aperture.

Is less than Ra3.2. 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 instantly. Hence, the standard of the wrapped parts is great, and also the surface flaws should not be too many.

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



7) The rolling process is lubricated with
Clean machine acrylic or sterile with diesel oil (ratio 3:7), or using special lubricating fluid provided by the manufacturer. A large amount of lubricating fluid should be used because the lubricating fluid needs to clean the small metal powder produced from the rolling process. Maintain the lubricating fluid sterile, listen to dust filtration and prevention.

8) Rolling effect is closely linked to the Previous procedure. After the present process, if the surface is too concave and Convex, the rolling pressure will also increase, and the feed quantity will be Reduced, therefore the rolling result will not be ideal. It’s Suggested to cover Attention to the machining precision in the process before rolling, and pay Attention to cleaning at the same time to prevent the chip sticking to the inner Wall of cylinder body.