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Super Finishing Stones   
 

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An abrasive process for the superfine machining of sealing and bearing surfaces, piston rods and rollers. Ground surfaces are generally evaluated using the following criteria: Peak-to-Valley depth, percentage of contract area waviness (irregularities) in a longitudinal direction (feed spirals) and circumferential direction (chatter marks), and the concentricity.

Designation of KINIK Superfinishing Stones (Example) :
 

80

100x8x8

WA

3000

3

V

S

Super finishing Stones shape No.

Size

LxWxT

Abrasive

Grain Size

Grade

1. 2 ... 8. 9.

Bond

Impregnation

S.B.X etc

 
Recommendations
 

Application

(material)

Achievable

Peak-to-

Valley height

R max. (um)		 Recommendation
Plunger-Cut Through-Feed

Unhardened steel

Tensile strength

Up to 70 kg//mm2
0,3-0,8
0,1-0,3
GC1500, 4VS
GC3000, 4VS

GC2000, 4VS

Heat-treated steel, Tensile strength ~100 kg//mm2
0,3-0,8
0,1-0,3
WA1500, 2VS
GC3000, 4VS
GC2000, 3VS

Hardened steel <64HRC
0,3-0,8
0,1-0,3
WA1500, 2VS
GC3000, 3VS

GC2000, 3VS

Hardened steel <64HRC
0,3-0,8
0,1-0,3
GC1500, 3VS
GC3000, 2VS

GC2000, 2VS
Nitriding steel
0,3-0,8
0,1-0,3

GC1500, 3VS

GC3000, 2VS

GC3000, 2VS

Chromium
0,3-0,8
0,1-0,3

WA1500, 2VS

WA3000, 2VS

WA3000, 3VS

Gray cast andChilled cast iron
0,3-0,8
0,1-0,3

GC1500, 3VS

GC3000, 3VS

GC2000, 3VS
Standard Sizes
Throughfeed and plunge-cut Superfinishing of cylindrical workpieces
Standard sizes(mm)

For workpiece

(ø mm)		 Stone area (cm2)
50x18x3 4.5~8 1.5
50x18x5 7.5~13 2.5
60x18x8 12~21

4.8
60x18x13 20~34

7.8
60x28x18 26~47

11
60x28x28 41~75

17
60x36x28 75 and over 17
Needle rollers
Standard sizes(mm)

For workpiece

(ø mm)		 Stone area (cm2)

50x40x0.8

1.0~1.5

0.4

50x40x1

2.0~2.5

0.5

50x40x1.5

2.5~3.0

0.75

50x40x2

3.0~3.5

1.0

50x40x2.5

3.5~4.0

1.25
Superfinishing of ball bearing races
The stone sizes depend on the race diameter and the groove sizes.
Pre-shaping of the superfinishing stone is usually done manually.
Note :  
For superfinishing extremely hard materials, for instance, oxide ceramics, glass or carbide, the use of diamond or CBN sticks is recommended.
 
  
 
   
    
  
 

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