Monday, 27 May 2013

Levibreton KFM - Polishing lines for marble strips

Polishing lines for marble strips: 

Many years ago Breton was the first company to present continuous polishing systems for marble, revolutionising the industry.
Breton with the new Levibreton KFM series confirms its leadership in polishing systems for marble by offering, as always, highly reliable and innovative technological solutions, guaranteeing constant and superior machine performance over time.
A Levibreton KFM to satisfy any polishing requirement
The Levibreton KFM are available in various configurations and with various fittings, and they can operate as individual units or can be integrated into a complete processing plant. They can be fitted with calibrating spindles or polishing spindles and the number of spindles mounted can vary depending on the Customer’s precise production requirements.
High-power and High-precision calibrating units
The calibrating spindles are mounted to a robust cast iron monolithic structure which practically eliminates vibrations generated when operating even during intensive work cycles. A recirculating ball screw assembly positions the diamond plate guaranteeing constant precision and performance reliability. This system also automatically raises the spindle in the event the conveyor belt shuts down preventing the diamond tool from excessively machining the workpiece, and then when restarted the spindle automatically returns to its preset machining depth.

The machining depth for each spindle is visualised on a digital display with a precision to hundredths. To guarantee such highprecision machining encoders detect and monitor the position of the spindle rather than the ball screw assembly which moves the spindle. The recirculating ball screw assembly system adopted for raising the spindle guarantees fast and precise spindle
movements without wear, unlike conventional trapezoidal screw systems which in emergency conditions only allow for controlling vertical positioning of the spindle and do not raise and lower spindle.
Dynamically balanced large diameter and dimensioned diamond tools combined with high-powered motors, ensure high-speed machining performance.
The diamond are fitted with a removable external crown that allows for quick diamond segment assembly and fitting.
High-performing honing-polishing units  
The honing-polishing units are result of a specific design which has led to achieving:
Greater rigidity and machining performance thanks to
- new design cast iron housings.
- increased motor power.
Greater reliability thanks to
- new lubrication channels in the shaft bushing.
- a new central water feeding system which flows in axis with the spindle, mounted in an elevated position preventing any build-up and deposits.
- new lifting and lowering cylinders with protected rod.
Easy maintenance thanks to
- centralised grease nipples on the front of the spindle.
- new self-adjusting thrust bearings.
- the new system for displaying consumption of abrasive material.
Greater and improved safety thanks to
- water feeding in axis with the spindle to avoid any leakage onto the internal components and external water flow deviation system in the event of overfeeding or blockage.
- sealed and protected commands.

High-performing honing-polishing backing plates
Each honing-polishing spindle is fitted with a special Breton new design abrasive holding plate. The pneumatic operating pressure can be adjusted utilising the two pistons provided which also raise the head in the event there is no workpiece.
These special abrasive holding plates have a 500 mm diameter, mount 8 abrasives and are fitted with an exclusive multidirectional shock absorbing system.
The entire assembly ensures perfect elasticity and a constant and optimal operating pressure resulting in a workpiece with a perfect and uniform polished finish right up to the edges, all with a minimal consumption of abrasive material.

Adjusting working width
The robust side guides which contain the workpiece to polish can be adjusted in width utilising the two manual handwheels one mounted at each end of the machine in an easily accessible position for the operator. The working width is then set utilising the keypad on the operator’s control panel.

P E R F E C T  P O L I S H E D  F I N I S H
 Fixed calibrating units and honing-polishing units mounted on mobile bridge for a perfect polished finish of any size workpiece
In all the various models of this machine the calibrating spindles are mounted to a robust cast iron monolithic structure integral to a fixed rigid bearing beam. This entire structure practically eliminates vibrations generated when operating even during intensive work cycles. The experience developed by Breton teaches us to be able guarantee a quality polished finish for any size workpiece, it is indispensable that the honingpolishing spindles are mobile and not fixed. This is why the honing-polishing units on all the models of this machine are mounted to a mobile bearing beam, designed with a special closed rectangular profile, which generates elevated moments of inertia and optimal bending and torsional rigidity.

The beam rests on two vertical structures that travel on amply dimensioned rectified and tempered roller sliding blocks enclosed in a oil bath, along cast iron bridges which house the ground and tempered travel ways.
The reciprocating movement of the beam is powered by a transmission shaft connected at each end to a rack and pinion assembly. The shaft in turn is driven by a powerful motor reducer unit mounted on the centreline and commanded by a frequency variator.

Safety protections
The Levibreton KFM machines are fitted with front sliding soundproofed safety panels of robust construction with an ABS and polyurethane sandwich structure, and are resistant to water and waste generated during machine operation. Protective rubber spray guards are fitted to the beam facing the abrasive backing plates “in line” with the workpiece to polish.

Controls and display
Analogical manometers with operating pressure regulators and the spindle cycle selector switches are positioned in correspondence to each honingpolishing unit above the front sliding protections, protected from humidity, and easily accessible to the operator.

Displays with a precision to hundredths and selector switches for vertical positioning of the spindles are mounted to the front of each calibrating group. An operator’s control panel with display is mounted to one of machine side panels.

The polishing machine for marble strips Levibreton KFM is available in 10 version:
- KFM 65/28
maximun workable width 650mm, 2 calibrating unit and 8 dressing units
- KFM 65/33
maximun workable width 650mm, 3 calibrating units and 3 dressing unit
- KFM 65/012,
maximun workable width 650mm, 12 dressing unit
- KFM 65/312,
maximun workable width 650mm, 2 calibrating units and 12 dressing unit
- KFM 65/014,
maximun workable width 650mm, 14 calibrating unit
- KFM 65/414,
maximun workable width 650mm, 4 calibrating units and 14 dressing unit
- KFM 100/312,
maximun workable width 1.000mm, 3 calibrating units and 12 dressing unit
- KFM 100/28,
maximun workable width 1.000mm, 2 calibrating units and 8 dressing unit
- KFM 100/012,
maximun workable width 1.000mm, 12 dressing unit
- KFM 100/014,
maximun workable width 1.000mm, 14 dressing unit.

Well, that’s all for today.
For more INFO and PRICE about Levibreton KFM write to
Sergio Prior


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