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Solutions for Crankshaft Grinding
A type of innovation with the grinding wheels, the crankshaft grinding wheels finds its usage in the different automotive, truck, diesel, aircraft, and small engine manufacturing industry and also in the various engine rebuilding firms that are used to regrind the pins and the bearings.
Main Bearing and Crankpin Journals Grinding with vitrified CBN grinding wheel
Cubic boron nitride (CBN) grinding wheels are used for high production machining of automobile crankshafts.
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Applied material
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* Cast iron: chilled cast iron, nodular cast iron, grey cast iron, alloy cast iron, etc
* Steel: 20Cr, GCr15, CF53, 45# steel, 55# steel, 80B high carbon steel, etc |
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Benefits
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Long dressing interval = Long tool life
- Consistent surface finish and high profile stability
- Reduced thermal and mechanical damage to workpiece |
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Crankshaft Grinding Machines
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NTC, TOYODA,LANDIS, MIKROSA, JUNKER, SCHAUDT, EMAG,Etc
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Main Bearing Grinding with Vitrified Aluminum Oxide Wheel
When producing small lots or machining larger crankshafts (for trucks and ships), grinding wheels with aluminium oxide abrasives are used.
Benefits of Moresuperhard Vitrified
-The evenness of hardness and balance performance of the wheels are 30-50% higher than that of China State Standard.
- The thickness deviation of a group of the wheels is not more than 0.2mm.
- The parallel tolerance of two ends is not more than 0.1mm.
Cubic boron nitride (CBN) grinding wheels are used for high production machining of automobile crankshafts
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Diameter |
Hole |
Thickness |
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inch |
mm |
inch |
mm |
inch |
mm |
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14’’ |
355 |
3’’ |
76.2 |
1/2’’. 3/4’’. 7/8’’ |
13, 19, 22 |
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16’’ |
405 |
3’’, 5’’ |
76.2, 127.0 |
3/4’’. 7/8 . 1’’ |
19, 22, 25 |
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18’’ |
455 |
3’’, 5’’ |
76.2, 127.0 |
1’’. 1-1/8’’. 1-1/4’’. 1-3/4’’ |
25, 28, 32, 45 |
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20’’ |
510 |
3-3/4’’, 6’’ |
95.25, 152.4 |
3/4’’. 7/8’’. 1’’. 1-1/8’’. 1-1/4’’. 1-1/2’’ |
19, 22, 25, 28, 32, 38 |
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22’’ |
560 |
6’’ |
152.4 |
7/8’’. 1’’. 1-1/4’’. 1-3/4’’ |
22, 25, 32, 45 |
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23’’ |
585 |
6’’ |
152.4 |
3/4’’. 7/8’’. 1’’. 1-1/8’’. 1-1/4’’ |
19, 22, 25, 28, 32 |
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24’’ |
610 |
8’’ |
203.2 |
3/4’’. 7/8’’. 1’’. 1-1/8’’. 1-1/4’’. 1-1/2’’. 1-3/4’’ |
19, 22, 25,28, 32, 38, 45 |
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26’’ |
660 |
8’’ |
203.2 |
3/4’’. 7/8’’. 1’’. 1-1/8’’. 1-1/4’’. 1-1/2’’. 1-3/4’’ |
19, 22, 25,28, 32, 38, 45 |
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28’’ |
710 |
6', 8’ |
152.4, 203.2 |
3/4’’. 7/8’’. 1’’. 1-1/8’’. 1-1/4’’. 1-1/2’’. 1-3/4’’ |
19, 22, 25,28, 32, 38, 45 |
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30’’ |
760 |
8', 12 ',17-3/4’’ |
203.2, 304.8, 450.8 |
3/4’’. 7/8’’. 1’’. 1-1/8’’. 1-1/4’’. 1-1/2’’. 1-3/4’’ |
19, 22, 25,28, 32, 38, 45 |
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32’’ |
810 |
8', 12’ |
203.2, 225.0, 304.8 |
3/4’’. 7/8’’. 1’’. 1-1/8’’. 1-1/4’’. 1-1/2’’. 1-3/4’’. 2’’ |
19, 22, 25,28, 32, 38, 45,50 |
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36’’ |
915 |
12’ |
304.8 |
1’’. 1-1/8’’. 1-1/4’’. 1-1/2’’. 1-3/4’’. 2’’. 2-1/2’’ |
25,28, 32, 38, 45,50,65 |
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40’’ |
1015 |
12’’ |
304.8 |
1’’. 1-1/8’’. 1-1/4’’. 1-1/2’’. 1-3/4’’. 2’’. 2-1/2’’ |
25,28, 32, 38, 45,50,65 |
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42’’ |
1065 |
12’’ |
304.8 |
1’’. 1-1/8’’. 1-1/4’’. 1-1/2’’. 1-3/4’’. 2’’. 2-1/2’’ |
25,28, 32, 38, 45,50,65 |
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50’’ |
1250 |
12’’ |
304.8 |
1-1/4’’. 1-1/2’’. 1-3/4’’. 2’’. 2-1/2’’ |
32, 38, 45,50,65 |
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60’’ |
1500 |
12’’, 20’’ |
304.8, 508.0 |
1-1/2’’. 1-3/4’’. 2’’. 2-1/2’’ |
38, 45,50,65 |
Rough Grinding Main Bearing and Crankpin with Electroplated CBN Wheel
A pin chasing process with electroplated CBN wheels is used for the roughing of the main and in particular the pin bearings of a crankshaft.
Finish Grinding FLANGE and POST GRINDING
Finish grinding with vitrified bonded aluminium oxide or vitrified cbn wheels.During cylindrical grinding operations for the flange and post it is possible to use different specifications depending on the requirements of the respective contact zones.
Dressing and truing of crankshaft grinding wheels
The dressing and the truing of the grinding wheels: This is mainly done in order to restore the original cutting geometry and to make a final product which is flatter and round. The grinding wheels get their flatness and roundness from the dressing and truing of the grinding wheels.
Drawing Specification of vitrified cbn wheel
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Shape |
D (mm) |
T (mm) |
H (mm) |
X (mm) |
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1A1 |
500 |
20 |
203 |
5 8 10 |
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1A1 |
22 |
203 |
5 8 10 |
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1A1 |
19.5 |
203 |
5 8 10 |
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1A1 |
600 |
35 |
132 |
5 8 10 |
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1A1 |
19.8 |
132 |
5 8 10 |
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1A1 |
20.5 |
132 |
5 8 10 |
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1A1 |
650 |
40.5 |
132 |
5 8 10 |
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1A1 |
43.5 |
132 |
5 8 10 |
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1A1 |
44.5 |
132 |
5 8 10 |
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1A1 |
50.5 |
132 |
5 8 10 |
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* other size can be customized |
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The case of Vitrified CBN Grinding Wheel for Crankshaft
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Application parameters |
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Work piece |
Truck crankshaft:
End face ø90.4mm/Journal outer circle ø74mm |
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Material |
42CrMoA, HRC 52-58 |
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Machine |
NAXOS UNION |
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Grinding parts |
Journal end face, rounded corners and outer circles |
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Cooling fluid |
Oil |
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Grinding way |
Cut into the mill |
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Grinding wheel |
1VG1L1 650- -39.6- -6- -3.5 NB151 |
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Dressing wheel |
CNC electroplating dresser roller SG 71P-150-1.2 |
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Grinding parameters |
Linear speed Vc=95m/s |
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Grinding allowance:
outer circle ae = ø1.2mm, end face ae = ø0.5mm |
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Maximum feed speed Vfa = 20 mm/min |
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Dressing parameters |
Linear speed VR=85m/s |
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Dressing quantity aed=15*2+ 1 * 2 um |
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Dressing speed ratio qd= + 0.89 |
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Grinding performance
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Maximum material removal rate Q'wmax = 94.7mm³/mms |
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Grinding time TG = 10 min (40% efficiency improvement) |
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Dressing frequency
mT=210 journal/Dressing(50%life improvement) |
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Roughness Rz<4.5um |
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