Cylindrical Peel Grinding
“Peel” grinding is the process of a thin wheel (1/4” to 1/2”
thick) dressed with a lead to equal the total amount of stock
per pass and is used instead of a plunge or standard traverse
grinding operation. The process is more like turning with the wheel
taking off
small to large depths of stock in one or two passes. Because it is
using CBN it can be applied to hard or soft materials. If the material
is nonferrous like carbide, then diamond can be used. Wheel S.F.P.M.
is normally 20 to 24,000 S.F.P.M.
and part rotation for O.D.
applications
can be as high as 12,000 rpm.
| Part: |
Pump Shaft. Overall length 5". Peel grinding section 2.5"
length with diameters ranging from 1.25" to 1". Each part has 2
diameters, 2 faces and multiple radii. |
| Part Tolerances: |
Roundness ±0.0002" at 1.67 Cpk |
| Material: |
Hardened Steel |
| Hardness: |
58 - 62 Rc |
| Wheel Specification: |
20" x 1" x 8" wheel type 14V1SP U=0.450" X=0.500" Vitrified CBN |
Conventional Al2O3Wheel
| Wheel Speed: |
8,500 S.F.P.M. |
| Work Speed: |
85 |
| Pieces per dress: |
1 |
| InFeed per dress: |
0.0007 |
| InFeed rate: |
0.0155" per min. (Rough) |
| Coolant: |
Semi-Synthetic |
| Total Cycle Time: |
2 minutes |
|
Vitrified CBN ("PEEL")
| Wheel Speed: |
24,000 S.F.P.M. |
| Work Speed: |
480 |
| Pieces per dress: |
20 |
| InFeed per dress: |
0.00003 |
| IPR*: |
0.001" to 0.007" |
| Coolant: |
Semi-Synthetic |
| Total Cycle Time: |
1 minute |
|
Savings / Advantages: Old process using Al2O3
needed a lot of wheel changes and very long set up.
The Peel grinding wheel can grind all of the 120+ parts with the same
set-up and the same wheel (50,000 parts per wheel). The old process
was not meeting Cpk and the new process is many times the Cpk
requirement. The cell has reduced the number of people by more than 10
per shift.
* Inches per revolution
For more information on how to order Superabrasives, visit Westerntoolco.com
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