Why is rolling technology used so widely in precision machining?

The roller burnishing process is a kind of non-chip processing, and the whole process can be accomplished by applying pressure to the surface of the workpiece by a certain form of rolling tool. Roller burnishing tool is at room temperature using the principle of the metal plastic deformation, rolling flat surface uneven places, to change the surface structure, mechanical properties, shape and size to achieve the effect. Therefore, this method can achieve smooth processing and strengthen two purposes at the same time. The surface strength of metal workpiece is strengthened after surface rolling, and the performance of workpiece, fatigue strength, abrasion resistance and corrosion resistance are obviously improved. After rolling, the hardness of the workpiece can be increased by 15 ~ 30%, while the wear resistance increases by 15%.

Rolling processing can increase surface roughness from Ra6.3 to Ra2.4 ~ Ra0.2. And there is a high production efficiency, some of which can be completed in a few minutes or seconds.

Rolling process can solve some key problems which are not easy to be realized. For example, the machining of a large cylinder block. At the same time, it is also suitable for the finishing machining of special holes or the finishing process of some special materials.

Rolling process is widely used in all large, medium and small factories. In terms of processing quality, production efficiency, production cost and other aspects, roller burnishing process is a superior processing method. In some respects, it can completely replace fine grinding, grinding and honing.

At present, the processing method of the rolling tool by external force can be divided into three types: mechanical, rolling and spring.

According to the processing nature, it can be divided into light finishing and intensive processing.

The roller burnishing tool has the advantages that the machining center does not have. Because the roller burnishing tool can be simple and low cost to carry out the ultra-precision machining of parts. It has been widely used in the automotive industry, such as precision machinery, chemical and household appliances.

What are the performance of the rolling tool products?

Roller burnishing tools, extruding machine, extruding tool, skiving and roller burnishing tool, superfine burnishing rolling head is a special tool for machining holes and shaft parts with no cutting rolling principle.

The surface of the metal surface has a plastic deformation, so that the workpiece reaches the mirror.

The precision of workpiece dimension is guaranteed, and the wear resistance, corrosion resistance and fatigue resistance are obviously improved.

Burnishing rollers have been widely used in aviation, automobile, motorcycle, hydraulic pneumatic and electromechanical industries.

We have steadily improved the quality and efficiency of our products, and have been well received by our customers with high precision and reasonable price.

Product performance

After rough machining of the workpiece, the surface roughness can be reduced to ra0.2um — 0.05um, from around the Ra6.3um.
With mechanical fine tuning device, the deviation control is very accurate (within 5/1000mm), and the mass production size is the same. Through hole, blind hole, taper hole, outer cone, hole end face, step shaft can be processed.
After rolling, the hardness of the working surface can be increased by 40HV, which improves the fatigue resistance.
This tool is small in size and easy to operate, and has low maintenance cost in the long term (parts with wear and tear can be replaced).
It can be used in cars, boring, drilling, milling, CNC machining centers and special production lines, replacing and better than traditional grinding, honing, grinding and other processes.

How to apply double rod roller burnishing tool in the thin-walled tube processing?

The pipe fitting is required to have sufficient wall thickness when rolling with the roller burnishing tool. Its wall thickness should be based on the unilateral calculation, according to different material hardness to the wall thickness requirement also has the difference. The wall thickness of the steel parts can be thinner than 2mm, while the copper aluminum needs more than 3mm. If the wall is too thin, it will cause deformation of the workpiece, the force is uneven, and even the compressive stress will break the damage.

(figure 1)

Among RBT customers, some of them need to process thin stainless steel flow orifice plates (figure 1).

Because the thickness of the flow orifice plate is very thin and the machining rigidity is very poor, it is very difficult to meet the requirement of form tolerance and surface roughness by adopting conventional machining method. To this end, we adopt three kinds of double rod roller burnishing tools, which can solve the problem of insufficient rigidity.

What’s the processing principle of roller burnishing tools?

Schematic representation of roller burnishing process.

Schematic representation of burnishing process.

The roller burnishing tools works like a road roller flattening the uneven road.
Roller burnishing tool is to use very smooth roller rolling by processing the surface of the metal, the workpiece performance high extrusion convex parts to dips, so that the machining surface smooth as a mirror effect, this is a kind of plastic processing.
The surface roughness of workpiece is up from Ry1.6-3.2 um to Ry0.1-0.2 um, and improve the processing surface hardness, wear resistance, corrosion resistance, sealing, etc., to eliminate early wear, these have the advantage of machining cannot be replaced.
The rolling tool has a fine tuning device. The adjustment coefficient of each small grid is 0.0025mm, and the total adjustment range is 0.3mm-0.4mm. Therefore, the precision of the processed dimension is also improved accordingly.

The control method of roller burnishing tools

1. Measuring the burnishing tool’s diameter with micrometer.
2. Push the calibrated set to the handle and rotate it at the same time, adjust the diameter of the tool, reduce the left rotation, and increase the right rotation, each scale value is 0.0025mm.
3. When the diameter is adjusted, release the aluminum shell and automatically lock the diameter.
4. When machining blind holes and step holes, the bottom is about 0.5mm-1.0mm cannot be machined. The needle can lightly touch the bottom of the hole.

Processing equipment

We are roller burnishing tools suppliers. RBT roller burnishing tools are suitable for common drilling machine, lathe, boring machine and machining center.
The clamping forms of tools include: straight shank and Morse taper shank. It can also be made according to customer needs.

Our Roller Burnishing Tools are made using high-grade raw material, at the vendors’ end. Our product range is highly demanded in the market for its hassle-free work performance the users’ premises.

If you do not know how to choose the model of the burnishing tools, you can contact us. We have professional customer service staff to help you find the most suitable product.

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