Top of the page To the text skip menu
HOME > "Superoll" Roller Burnishing Tools Q&A
Display print image

"Superoll" Roller Burnishing Tools Q&A

 

Q1. What materials can be processed?

For plastic deforming metals, Superoll processing is possible.
The hardness of the material that can be processed with Superoll is normally limited to HRC40.
For a heat-treated workpiece having a high degree of hardness, it is recommended that "Cat's Eye" diamond burnishing tools be used.

Click here to view "Cat's Eye" diamond burnishing tools.

 

Q2. What is the smallest workable diameter?

The smallest workable diameters differ depending on the type of tool.
Please see the introduction page of each tool for more information.

 

Q3. What type of driving machine is needed?

No special driving machine is needed. Any machine with rotation and feed functions can be used.
Also note that Superoll processing requires a smaller processing torque when compared with cut processing. Therefore, the driving force of driving machines is also small.
It can be easily attached to a general-purpose drill press, lathe, turret machine, boring machine, drilling unit, etc.

 

Q4. How much will the dimensions change?

When Superoll processing is performed, the irregularities on the surface will be pressed, and as a result, dimensions will change slightly.

   

Q5. Is coolant needed?What types are permissible?

Please make sure to use a large amount of low viscosity coolant [10mm2/s (1/64in2/s) or less] during the Superoll burnishing for the purpose of washing, cooling and lubrication.
Burnishing without coolant causes significantly shorter life of consumables.

Although both oil based and water soluble type coolant could be available for Superoll burnishing, oil based coolant generally tends to make the consumables life longer.
When using coolant by circulating, please make sure to install the filtration to remove fine particles or dusts in the coolant.
Recommended filter accuracy is 5 - 40µm (1/5 - 1.6µin).

 

Q6. To what degree is finishing done for surface roughness?

The best case provides a surface roughness of 0.2 µm Rz.
However, the surface roughness of finishing depends largely on the materials, pre-processing roughness, and processing conditions.

 

Q7. What about roundness?

Roundness will increase slightly as a result of improved surface roughness.
However, Superoll processing is a plastic processing that is limited to the surface layer. Basic shapes such as ovals cannot be improved.

 

Q8. How much does hardness increase?

Iron-based metals will see an increase of about Hv40.
Stainless steel materials can have hardness increases of up to Hv100.
Please note that an increase in hardness refers to a depth of 0.1 to 0.2 mm from the workpiece surface.

 

Q9. Can thin workpieces be processed?

Superoll processing provides finishing by pushing rollers over the workpiece surface. Therefore, the workpiece needs a sufficient thickness (at least 20% of the inner diameter) to withstand the rolling pressure of the rollers. If the thickness is thin, swelling may occur or roundness may suffer. Normally, this problem can be solved by applying the following method:

  1. Decrease the burnishing amount.
  2. Use a jig to support the outer periphery.
  3. Perform Superoll processing before thickness becomes thin.

To meet your specifications, we also design and manufacture tools that are dedicated to thin workpieces.

 

Q10. What types of pre-processing surfaces are applicable?

Superoll processing is a plastic processing method used to create a smooth finish by pushing rollers over the irregularities of surfaces. The best pre-processing surface has a regular feed pattern via the use of boring and lathe machines.
On irregular processed surfaces due to the use of drills and other tools, depressed areas cannot be filled completely, and as such, it is not possible to achieve favorable finishing.

 

Q11. How much is fatigue strength increased?

Compared to lathe turning processing, fatigue strength can see an increase of 30%.
Improvements in fatigue strength depend on the following three synergistic effects:

  1. Compressive residual stress generated in the surface.
  2. Increased material hardness as the result of work hardening.
  3. Elimination of subtle irregularities through surface finishing.

 

Q12. Can special tools be manufactured?

We design and manufacture tools best suited to your needs.

 

Q13. How long is the processing time?

Compared to grinding work, the processing time is approximately 1/10 to 1/20. Mirror finishing can be done in one pass.

 

Q14. Is processing repeated many times?

Superoll processing is different than grinding work and honing. It provides a mirror finish in just one pass.
Almost no effect will be achieved by performing processing more than once.

 

Q15. Are tool diameters fixed?

The SH/SB series and SA series of Superoll are equipped with a built-in 0.0025-mm micro-adjustment mechanism.

 

Q16. Are tools disposable?

Consumable parts such as the roller and mandrel are all replaceable, thereby helping reduce the running cost.

 

Q17. Can the dimensions (sizing) of workpieces be corrected?

Dimension correction (sizing) is possible between a few micrometers to several tens of micrometers.
There are differences depending on materials and processing conditions, but in general, dimension changing according to inner diameter processing is several tens of micrometers, whereas outer diameter processing is a few micrometers.

 

Q18. Can curved and spherical surfaces be processed?

The following tools can be used for curved and spherical surfaces.

 Click on the name of the tool for details.

For curved surface processing

For spherical surface processing 

 

 

Adobe Reader by Adobe is required to view PDF files.
If you don't have Adobe Reader, please click the banner link to download it.(Free)