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Crankshaft Grinder

M8260/3000

M8260x3000 crankshaft grinding machine is used to grind the journals and crankpins of crankshafts, especially for the automobile, tractor diesel engine works and their repair shops. The machine is featured with simple structure, easy operation and a wide application.
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M8260x3000 crankshaft grinding machine is used to grind the journals and crankpins of crankshafts, especially for the automobile, tractor diesel engine works and their repair shops. The machine is featured with simple structure, easy operation and a wide application.

Specialized chucks are offered for clamping of work piece, which can be removed and replaced with centers according to different length. The longitudinal traverse of work table can be controlled either by hand or by automatic, and the cross traverse of wheel head can be controlled either by hand or by hydraulic.

With hydraulic system and electric linkage structure adopted on the wheel head, safety can be guaranteed when operate miss occurs during the grinding or adjusting process. A protective shield is equipped above the wheel head and a rapid driving-and-reversing mechanism is used on the wheel head, too.

The headstock and tailstock is in synchronization by employing FAGOR CNC control system by Spainand YASKAWA servo motor byJapan, under which the work piece revolves. Timing belt pulley and anti-backlash gear guarantee an accurate transmission ratio. A separated electric cabinet is adopted.

The wheel spindle, framed in telescopic construction, is driven by motor rested on wheel head through belt pulleys and triangular belt. Hydrostatic bearings by domestic makers are adopted on the wheel spindle. Separated oil system and accommodation oil tank as well as air-cooled device are employed on this machine.

 

 

maximum swing over bed:

Ф600mm

maximum length of workpiece:

3000mm

centre height:

320mm

diameter able to grind with steady rest: 

170mm (maximum)

50mm  (minimum)

centre distance:

3000mm

chuck distance:

2800mm

throw of pin:

120mm

maximum weight of workpiece:

600kg

speed of work spindle:

25-90r/min  (stepless)

taper of center for headstock:

metric tape 80

taper of center for tailstock:

metric tape 80

Work table

table traverse per hand wheel revolution:

5.88 (coarse)

1.68 (fine)

maximum amount of longitudinal movement:

3000mm (manual operation)

3000mm (engine driven)

Grinding carriage

wheel size:

900x65x305mm(maximum)

650x65x305mm(minimum)

speed of wheel spindle:

890r/min (maximum), 740r/min (minimum)

maximum traverse of grinding carriage :

185mm

rapid advance-and-retreat of grinding carriage:

260mm

adjustment range between grinding carriage

80mm (forward)    100mm(backward)

and bench hook

1mm

cross feed per hand wheel revolution:

0.005mm

cross feed per hand wheel division:

wheel peripheral speed:

35m/s

Hydraulic system

pressure range for mail oil way:

0.9-1.1Mpa

Pressure range for lubrication circuit:

0.2-0.3 Mpa

pressure of oil pump:

2.5Mpa

coolant system

rate of flow of cooling pump :

100L/min

Motor powers of the machine

motor power of grinding wheel:

15KW

motor power of headstock and tailstock:

2x7.5KW (SGMGH, Japan)

motor power of oil pump:

0.55KW

motor power of cooling pump:

3KW

motor power of work table:

3KW

overall dimension of the machine

9650x2400x1950mm(LxWxH)

net weight:

14000kg

Working accuracy

roundness:

0.09mm (0.018mmin diameter)

(in longitudinal section) conformity error between crank arm journals:

0.012mm

surface roughness

0.32μm

surface waviness

1.6μm

 

jaw chucks
wheel dresser
wheel balancing arbor
leveing wedge
driving dog
vertical aligning stand
horizontal aligning stand
wheel balancing stand
hanging measuring device
steady rest
centering device
grinding wheel

Polisher             

Diamond dresser      

Digital display device