CG500 CG500CNC Crankshaft Grinding machine
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| This Crankshaft Grinder has been designed to meet the different requirements of those, who have to grind both single pieces, small batch to production manufacturing. In fact this fast and precise machine, thanks to its flexibility and special options, is capable of the highest production levels and precision repeatability. Made of special and high quality casting. Bed ways and wheel head guides equipped with "TURCITE" material and automatic lubrication. Steady rest with hydraulic movement. Automatic plunge wheelhead feed system. Electronic sizing and continuous grinding gauge |
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SPECIFICATIONS
| CG500 | CG500CNC | |
| WORKING CAPACITY | |
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| Height of centres on table | 500 mm | 500 mm |
| Max distance between centers | 5100 mm | 5100 mm |
| Max. distance between self-centring chucks | 5000 mm | 5000 mm |
| Swing over table | 1000 mm | 1000 mm |
| Max head offset (stroke/2) | 250 mm | 250 mm |
| Max diameter admitted on std steady rests | 250 mm | 250 mm |
| Max workpiece diameter-new wheel | 460 mm | 460 mm |
| Max weight admitted between centers | - | - |
| Max weight admitted with steady rests | 5.000 kg | 5.000 kg |
| MACHINE SPECIFICATIONS | |
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| Z AXIS |
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| Max table speed | 0-3000 mm/min | 0-3000 mm/min |
| Resolution (depends from linear encoder precision) | - | 0,003 mm |
| Table motor power | 3 KW | 3 KW |
| Position measurement system | - | Encoder lineare |
| X AXIS |
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| ZMax speed | 5000 mm/min | 0-5000 mm/min |
| Fast grindhead feed | - | - |
| Micrometric grindhead feed | - | - |
| Max stroke | 840 mm | 840 mm |
| Ball screw (pitch x diameter) | 10 x 80 mm | 10 x 80 mm |
| Position measurement system | - | Encoder lineare |
| Hyraulic unit motor power | 2,2 KW | 2,2 KW |
| Axis control motor power | - | 2 KW |
| WHEEL UNIT | |
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| Diameter of grinding wheel | 1200 mm | 1200 mm |
| Max grinding wheel thickness | 160 mm | 160 mm |
| Standard grinding wheel thickness | 32 mm | 32 mm |
| Min grinding wheel thickness | 25 mm | 25 mm |
| Grinding wheel peripheral speed | 33 m/s | 33 m/s |
| Wheel rotation motor power | 28 KW | 28 KW |
| WORKHEAD | |
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| Stepless rotation speed | 0-60 RPM | 0-60 RPM |
| Diameter of chucks | 315 mm | 315 mm |
| Motor power for heads positioning | 0,25+0,25 KW | 0,25+0,25 KW |
| Headstock rotation motor power | 5,5+5,5 KW | 5,5+5,5 KW |
| LUBRIFICATION UNIT | |
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| Operating pressure | 4 bar | 4 bar |
| Tank capacity | 800 l | 800 l |
| Pump motor power | 0,37 KW | 0,37 KW |
| HYDROSTATIC UNIT | |
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| Pressure | - | - |
| Tank dimension | - | - |
| Motor | - | - |
FEATURES
Machine base
• It is made of high resistance monolithic cast iron, thermically stabilized.
• It has one flat and one "V" guide.
• Both guides are grinded and wide for the table movement.
Table
• Strong structure, thermically stabilized, with scraped surface in order to secure the highest precision of linearity and flatness in the different positions of the workheads.
• The guideways are covered with special anti-friction plastic material in order to:
-reduce the disengaging friction
-reduce the coefficient of general friction
-reduce the rubbing wear
• Table movement with synchronous servomotor and rack without clearance.
• Table positioning with linear encoders.
Wheelhead unit
• It moves on wide prismatic guideways
• The grinding wheel spindle rotates by means of a high precision bearings
• The transmission of the motion to the spindle takes places by Poli V belt
• The grinding wheel diameter is 1200 mm and the width can reach 100 mm
• The peripheral rotation speed of the grinding wheel is 33m/sec
• The motor power is of 28 KW and the machine can be equipped with a self-balancing system of the grinding wheel (optional equipment)
Workheads ( headstock and tailstock)
• Workheads are made of high resistance cast iron.
• The workheads-spindle is mounted on two triads of bearings of very high precision.
• The bearings are pretensioned in order to obtain the highest rigidity also in presence of high load.
• The heads can move on the table, they are supported by a pneumatic system (air cushion) for obtaining movement sensitivity and for avoiding table-rubbing wear.
• For cylinder-balancing, the workheads are provided with slide with proportionate counter-weights.
• Both workheads are supplied with motors with electronic synchronisation.
Setting-up and clamping system
The centring of the cylinder is obtained by means of a special support equipped with three movements that allow solving precisely and easily any problem regarding the work-piece centring:
• One offset movement on guides
• One side movement by means of tapered gibs
• One rotary movement by means of endless screw
Zero setting and angular position is assured by pneumatically controlled locking pins.
The clamping of the cylinder can be done by means of:
• Precision 3 jaws-self-centering chucks, or
• Precision 4 jaws-self-centering chucks, or
• pot chuck support with indexing for crankpin grinding, designed as per customer’s instructions
The machine is supplied with 3 manual steady rests
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