ROLLER BURNISHING TOOL

Abstract: this paper mainly Presents the process parameters, Engineering and performance of rolling tool so as to enhance the smoothness of products. Through the introduction of the article to describe how to enhance the surface of the workpiece after rolling strain, the top layer of the workpiece isn’t clean, the traces of rollingup, and so on.

Before The roller burnishing tool was widely used, many factories utilized polishing, honing, grinding and other techniques to enhance the surface finish of metal products in the machining procedure. The honing process also has specific advantages. For many inner holes with higher hardness and small bore diameter, the honing tool is used to complete the honing process, but its efficiency 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 ultimate 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%;

10-15% by diameter calculation.

The surface roughness can reach above Ra0.2 if The overfill is suitable and fits with other process parameters.



Second, the surface micro-protuberances After rolling are smoothed, and the contact with sealing substances is smooth, which reduces the usage of sealing components while reducing the usage of merchandise. In terms of processing efficiency, one roll can complete the processing. High production efficiency. (finishing Roller Burnishing Tool at 1.5 minutes could be finished; finishing 30 x 40 holes in 10 seconds can be finished ).

2. Procedure parameters and requirements

Amount: when machining the internal hole of the workpiece using the roller burnishing tool, the tool diameter is set to be slightly bigger than the previous machining size, rotating and feeding the instrument (workpiece), and rolling the inner hole. The gap value between the diameter of the tool and the size of the workpiece before processing is known as burnishing amount.

The burnishing level is set based on the Fabric and wall thickness. The setting of burnishing amount is generally 3 to 5 days of their surface roughness before processing, which can be ideal. After the material is steel, the burnishing amount 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 internal diameter will not change.



2) Preprocessing
Size: 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 diameter is affected by the substance, hardness and rolling pressure 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 mentioned that the inner diameter can’t be expanded to the same size as the width of the tool after rolling, because the enlarged inner diameter is reduced following the tool passes through as a result of elastic recovery of the material.

3) The upper limit of hardness of workpiece

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



5) The roughness of this preprocessed surface Is preferably less than Ra3.2. At the exact 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 wrapped parts is great, and the surface flaws should not be too many.

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



7) The rolling process is lubricated with
Clean machine oil or lubricated with petrol oil (ratio 3:7), or using specific lubricating fluid provided by the manufacturer. A large amount of lubricating fluid ought to be used because the lubricating fluid needs to clean the little metal powder produced in the rolling procedure. Maintain the lubricating fluid sterile, listen to dust prevention and filtration.

8) Rolling effect is closely related to the Previous process. Convex, the rolling strain will also grow, and the feed amount will be Reduced, so the rolling effect won’t be ideal. It’s Suggested to cover Focus on the machining precision from the process before rolling, and cover Attention to cleaning in the exact same time to prevent the chip sticking to the inner Wall of cylinder body.