Roller Burnishing Tool
Abstract: this paper mainly introduces the process parameters, Engineering and operation of rolling tool so as to improve the smoothness of merchandise. During the introduction of the guide 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 That 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 procedure also has certain advantages. For some internal holes with higher hardness and small bore diameter, the honing tool can be used to finish the honing process, but its efficiency is a lot lower than the roller burnishing tool.
1. Processing effect
First of all, after outside 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 improved by 15%;
Fatigue limit increased by 30%;
10-15% by diameter calculation.
The surface roughness may reach above Ra0.2 if The overfill is appropriate and matches with other procedure parameters.
After rolling are smoothed, and the contact with sealing substances is smooth, which reduces the usage of sealing parts while reducing the wear of merchandise. Concerning processing efficiency, 1 roll can complete the processing. High production efficiency. (finishing 100 x 300 holes at 1.5 minutes can be completed; finishing 30 x 40 holes in 10 seconds can be completed).
2. Roller Burnishing Tool and requirements
Level : if machining the internal hole of the workpiece with the roller burnishing tool, the tool diameter is set to be slightly bigger than the preceding machining size, rotating shaft and feeding the instrument (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 level is set based on the The setting of burnishing level is generally 3 to 5 days of the surface roughness before processing, which is ideal. When the material is steel, the burnishing amount ranges from 0.04 to 0.07mm to obtain the most perfect surface. When the burnishing level range of steel and cast iron components is 0.04~0.07mm, then its own internal diameter won't change.
2) Preprocessing
Dimensions : as the diameter size will change after rolling, the machining allowance should be left before rolling to ensure the dimensional tolerance. The variation of diameter and size is affected 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 must be mentioned that the inner diameter can't be expanded to the same size as the diameter of the tool after adjusting, cause the enlarged inner diameter is reduced after 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 lean Wall parts during rolling, the wall thickness of this machining part should achieve greater than 15% to 20 percent of their aperture.
Is less than Ra3.2. At the same time, when the hardness of casting materials isn't uniform, then the surface defects of rolling pressure is going to be exposed immediately. Therefore, the quality of the wrapped parts is great, and also the surface flaws shouldn't be too many.
6) The result of primary rolling is best, and The roughness can be reduced from 2-3 grades.
7) The rolling process is lubricated with
Clean machine acrylic or lubricated with diesel oil (ratio 3:7), or using specific lubricating fluid provided by the manufacturer. A great deal of lubricating fluid should be utilized cause the lubricating fluid needs to clear the little metal powder produced from the rolling procedure. Keep the lubricating fluid clean, listen to dust prevention and filtration.
8) Rolling effect is closely related to the Previous process. Convex, the rolling strain will also increase, and the feed quantity will be Reduced, therefore the rolling result won't be ideal. It's recommended to cover Focus on the machining precision from the process before rolling, and pay Attention to cleaning at precisely the same time to prevent the chip sticking into the inner
Before That 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 procedure also has certain advantages. For some internal holes with higher hardness and small bore diameter, the honing tool can be used to finish the honing process, but its efficiency is a lot lower than the roller burnishing tool.
1. Processing effect
First of all, after outside 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 improved by 15%;
Fatigue limit increased by 30%;
10-15% by diameter calculation.
The surface roughness may reach above Ra0.2 if The overfill is appropriate and matches with other procedure parameters.
After rolling are smoothed, and the contact with sealing substances is smooth, which reduces the usage of sealing parts while reducing the wear of merchandise. Concerning processing efficiency, 1 roll can complete the processing. High production efficiency. (finishing 100 x 300 holes at 1.5 minutes can be completed; finishing 30 x 40 holes in 10 seconds can be completed).
2. Roller Burnishing Tool and requirements
Level : if machining the internal hole of the workpiece with the roller burnishing tool, the tool diameter is set to be slightly bigger than the preceding machining size, rotating shaft and feeding the instrument (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 level is set based on the The setting of burnishing level is generally 3 to 5 days of the surface roughness before processing, which is ideal. When the material is steel, the burnishing amount ranges from 0.04 to 0.07mm to obtain the most perfect surface. When the burnishing level range of steel and cast iron components is 0.04~0.07mm, then its own internal diameter won't change.
2) Preprocessing
Dimensions : as the diameter size will change after rolling, the machining allowance should be left before rolling to ensure the dimensional tolerance. The variation of diameter and size is affected 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 must be mentioned that the inner diameter can't be expanded to the same size as the diameter of the tool after adjusting, cause the enlarged inner diameter is reduced after 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 lean Wall parts during rolling, the wall thickness of this machining part should achieve greater than 15% to 20 percent of their aperture.
Is less than Ra3.2. At the same time, when the hardness of casting materials isn't uniform, then the surface defects of rolling pressure is going to be exposed immediately. Therefore, the quality of the wrapped parts is great, and also the surface flaws shouldn't be too many.
6) The result of primary rolling is best, and The roughness can be reduced from 2-3 grades.
7) The rolling process is lubricated with
Clean machine acrylic or lubricated with diesel oil (ratio 3:7), or using specific lubricating fluid provided by the manufacturer. A great deal of lubricating fluid should be utilized cause the lubricating fluid needs to clear the little metal powder produced from the rolling procedure. Keep the lubricating fluid clean, listen to dust prevention and filtration.
8) Rolling effect is closely related to the Previous process. Convex, the rolling strain will also increase, and the feed quantity will be Reduced, therefore the rolling result won't be ideal. It's recommended to cover Focus on the machining precision from the process before rolling, and pay Attention to cleaning at precisely the same time to prevent the chip sticking into the inner
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