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Thursday 17 May 2012

New Levibreton KFT line for polishing marble

Good morning,
Today I’d like to show you a new polishing line for marble slabs we recently installed by one of our customers, SA.GE.VAN of Avenza - Carrara (Italy).

This line has a production capacity of approx. 1.200 m2 per shift and polishes marble slabs with a maximum size of 2050x3300 mm.
Once loaded on the line, the slab is first trimmed crosswise (leading/trailing end) and then lengthwise.

The slab is then polished on the Levibreton KFT with 8 spindles, dried and heated to remove any residual humidity.
At this point, the slab is automatically filled and exposed to UV rays so that the filler gelates and shrinks allowing for the manual addition of some more filler.

The filler is catalyzed under the kiln and the Levibreton KFT with 14 spindles completes the slab polishing process.
The dried slab is conveyed to the automatic waxing and application of a polyethylene sheet, to be lastly unloaded on the A-frame
.

Automatic slab loader






Longitudinal trimming machine





Polishing machine Levibreton KFT with 8 spindles
Cleaning unit



Radiant units



Automatic void filling machine





Slab filling



Polishing machine Levibreton KFT with 14 spindles












Automatic waxing machine



Automatic equipment to apply a protective film



 Special comb-shaped conveyor





Automatic slab unloader

Click here for more INFO.
By-by
Sergio Prior 

Tuesday 15 May 2012

Breton BESTWIRE - Single-wire machine for squaring blocks and cutting slabs

Breton BESTWIRE

MACHINE STRUCTURE AND MECHANISMS
Heavy-duty, heat treated arc-welded steel structure ensuring the required stiffness of the system and cutting precision of the machine.
Two opposite carts containing the components for the wire motion, slide vertically along the machine columns by means of screw/nut screw mechanisms, thus moving the wire up and down.
The wire is rotated by a large diameter driving pulley, which is actuated by belts and in-verter controlled asynchronous motor, in order to optimize the wire peripheral speed according to the material to be sawn.
Another large diameter driven pulley is constantly kept under tension by a pneumatic cylinder, thus giving the wire the ideal tension.
The mechanism is completed by two upper, independent driven pulleys and two wire-driving pulleys installed next to the point where the wire gets into, and comes out from, the block to be sawn.


LUBRIFICATION
A manually operated lubrication system provides lubricant to critical points.

PAINTING
In order to ensure a high corrosion strength, both the structure and the components are first sand-blasted to prepare the surface before painting, then coated with a zinc-based epoxy primer and lastly with a second bi-components top coat.

PULLEY COATING
All pulleys are coated with special, interchangeable, wear-resistant elastomer profiles.

SAFETY MEASURES   
A special sensor, connected to the stretching cylinder, detects any possible breakage of the wire and stops the machine instantly.

AUTOMATIC ADJUSTMENT OF THE WIRE LOWERING   
When cutting, the wire lowering speed is automatically managed by the machine control system through sensors, which detect the position of the stretching piston.

POSITIONING ACCURACY OF THE BLOCK-HOLDING TROLLEY   
The block-holding trolley has four motorized wheels, which are installed on rugged bearings. Wheels are provided with a special profile acting as a guide along the rails that are fixed to the foundations so as to obtain a perfect parallelism. The system ensures an accurate positioning of the trolley and a precise parallelism of cuts, thus enabling to cut slabs (even thick slabs) with the precision typically required by this type of operation.

PROGRAMMING
The colour touch-screen and user-friendly software ensure a simple programming, con-trol of the cutting cycle and management of the working axes. A mobile button panel makes the activation of the main working axes easier for the operator.
Click here for more INFO.
By-by
Sergio Prior