>> Download Brochure

Perfast BB

CUTTING POLISHING MACHINE WITH SINGLE OR TWIN POLISHING HEADS

The thorough knowledge of the technology for preparing rotogravure printing cylinder surfaces made Acigraf able to develop the turning and polishing machine PERFAST The solution allows to perform the cutting and polishing of the cylinder on the same machine. This machine has gained considerable success among ACiGRAF customers, with more than 90 machines installed from 1985 till today. PERFAST BB high versatility makes possible to deal with 11 types of cylinders, even the most particular, only by changing cutting and polishing parameters. This machine allows the cutting of chromed cylinders as well, eliminating de-chroming problems and the consequent waste of the exhausted electrolyte. The technology of the cylinder surface polishing is based on the traditional system of stone finishing, which still today guarantees the best level of roughness both for chemical, Laser and electro-mechanical engraving.
Construction features
The structure of the machine consists of a very thick steel bed electrically welded; the hard facing of the carriages sliding guides is made of high precision graund material; these structures grant a great sturdiness and precision to the machine and avoid the need of expensive foundations because it can be simply laid on the floor. The polishing head/s carriage and tailstocks carriage, are made of cast iron with hard facing on the sliding guides of a synthetic frictionless material allowing high efficiency in weight/sliding ratio.The working carriage traverse is carried out by clearance-proof ball bearing screws system and by a permanent magnet motor allowing an easy and vibration-proof movement.The working carriage is equipped with a tool-holder turret where are placed the cutting and edges tools. On the same carriage 1 or 2 STONE POLISHING HEADS ARE mounted.
The spindle and the tailstock set high-precision ball bearings and their rolling motion has D. C. motor driving. As far as the cylinder adaptors are concerned, the machine can be equipped, according to cylinder types, in the following way;
HOLLOWED CYLlNDERS
a) With cones of various inclination, according to the cylinder construction features.
SHAFTED CYLlNDERS
a)System with head stock holding the cylinder shaft centers.
b)System with self-centering chucks.
c)System with spring collet
As an option, we can provide a filtration system for the recycling of the polishing water with a substantial reduction of waste water

Operating software features
The software is able to memorize different polishing cycles in relation to required roughness.
POLISHING PHASE
- Pre-setting parameters for each cycle:
- Constant working pressure of the grinding stone/s
- • Polishing runs number
- Cylinder rotation speed
- Carriage movement speed
- Polishing stone/s rotation speed
The 2 POLISHING HEADS can work simultaneously on the cylinder.
CUTTING PHASE-SEMIAUTOMATIC
- Zero-setting of the tool
- Cylinder diameter reading
- Automatic carriage stop at the end of cutting operation