Description

Melchiorre ELC 810 Double Sided Fine Grinding Machine – Year 2006

SPECIFICATIONS:
OD Wheel…………31.9″
Diameter of Workable Part – Maximum…………9.3″
Load Pressure – Maximum…………1,000 DaN
Accuracy – Thickness…………+/- 1 Micron
Accuracy – Flatness…………0.5 Micron
Accuracy – Parallelism…………1 Micron
Surface Finish…………as Fine as Ra < 0.10 Micron
Upper and Lower Wheel Drives (each)…………14.75 HP
Dimensions – Approximate…………106″ x 60″ x 114″(H)
Weight – Approximate…………11,000 Lbs.

EQUIPPED WITH:
Siemens Simatic Touchscreen Operator Control Interface
Electronic Retroactive Pressure Control (via ballscrew)
Oscillation System (upper grinding wheel automatic stiffening/antivibration)
Independently adjustable Upper & Lower Drive Units
Integrated Marposs Gauging System, Integrated Wheel Parallelism Control
Transor Model 6190-700AD One Micron Oil Filtration System.
Thermal Care “Accu-Chiller” Model SQ2A0504X2A with Digital Oil Tank Controller
and Digital Plate Coolant Temperature Controller.
Shuttle Infeed & Take-Off System
Misc. Carrier Plates

Manufacturer Catalogue Information about FINE Grinding Machine:

WHAT IS FINE GRINDING?

Fine grinding is a superfinishing process performed by removing a well defined amount of stock from two parallel flat surfaces of components requiring extremely precise geometric accuracies and good surface finish. It is tipically the last grinding step of a mechanical production chain installed to improve and correct the geometry of parts coming from sintering, sawing, moulding or similar operations. Depending on the application, the stock removal can also be taken from just one flat surface.
The stock removal is gained by special super-abrasive tools, built with diamond or CBN (cubic boron nitride), through their friction with the parts to process. The grit size, the bond and the concentration of super-abrasive are defined upon the application.
The high level of technology involved allows such machines to achieve the same quality as the conventional lapping process. Main advantages from the latter are the much higher production (5-10 times than the lapping) and the cleanliness of the process: in fact, considering that any free abrasive slurry isn’t used, parts coming off the machine don’t need any deep washing or special solvent fluids.
Fine grinding technology is performed by Melchiorre with the double side machines series ELC. ELCs can cover all the main applications present in the high precision components industry.

ELC MACHINE’S MAIN FEATURES

The machines series “ELC” are designed for the double side fine grinding technology. ELC is the acronym of “Electronic-Logical Control”: the pressure, in fact, is applied electro-mechanically, through the movements of a ball screw controlled at close loop by a high precision load cell (± 1 DaN). This system, exclusive Melchiorre, allows to have quick and continous regulations of the working pressure and, consequently, a perfect repeatability of the loads.

The Melchiorre “ELC” machines are built with a very strong and extremely stiff monolithic structure of steel. The traditional “C-frame” configuration let the upper wheel have just a vertical movement and, consequently, to get a higher working stability.

The oscillation of the upper wheel is automatically adjustable, optimizing the surface of contact wheels- parts under process.

The machine provides also for a patented system of measuring control IN PROCESS, that permits to check the parts during the cycle and orders its stop automatically (device resolution: 0.1 micron). This technology ensures to accomplish the quality required without any further measurement:

– THICKNESS VARIATION: ± 1 micron
– FLATNESS: < 0.5 micron - PARALLELISM: < 1 micron - SURFACE FINISH Ra up to 0,01 micron Special solutions can be introduced, as well, to let the customer improve its own technological product and be more competitive in the market. Some examples of these solutions are the convex-concave grinding (a few microns) , the use of special spacers for the contemporary grinding of pumps covers, the polishing process or lapping on the same machines etc. Moreover, through specifically designed equipment, it is possible to perform a single side grinding process, keeping all the advantages of double side machines. Finally, Melchiorre technological package includes also the optimization of the available time through customized automations for the loading of both parts and work-carriers. The “ELC” sizes go from 400mm up to 2000mm.