LITOSTROJ RAVNE LTD. Manufacturer of high quality custom-made industrial hydraulic and mechanical presses for sheet metal forming with nominal force from 400 to 40.000 kN, with length of a table up to 8 meters.
The skills and know-how of Litostroj RAVNE experts, the innovations and solutions being evolved and implemented in mechanical and hydraulic presses for more than forty years, are perfectly brought into use and combined in excellent custom designed TRANSFER PRESSES, which are a superior products of Litostroj RAVNE.
Ravne brand originates from 400 years of steel milling tradition. The presses production of mechanical and hydraulic presses for steel and sheet metal forming industry have been performed for more than 45 years. In this period, various mechanical and hydraulic presses and press line equipment were produced.
Presses for transfer dies (tools) are used for production of small to medium size sheet metal (semi)products. The technological requirements for part production are mainly assigned “by the part itself” and transfer dies mounted in the press.
Slide of the specific press for transfer dies can also be made out of cells welded together into one reinforced slide. Each of the cells (number of cells is equal to number of transfer dies) can provide required technological adjustments specific to each of the transfer dies needed for part production. Litostroj RAVNE is an expert in production of presses for transfer dies, which are designed to be very stabile and firm. The slide is well adjusted, guided on 8 points, reinforced and balanced to give extra stability and support to the transfer dies installed. With that the straightness and vertical parallelism is achieved. All conditions for producing even the most challenging parts are obtained.
Transfer presses are fed with blanks of sheet metal produced with blanking press line. Usually the feeding of the presses for transfer dies is automated with destacker, or a robot, but sometimes the presses are additionally equipped with decoiler and feeder, in order to loosen inner tension of the coil being used when that is important, straightener can be added between decoiler and feeder into the production line.
Press with mounted transfer tools is fed with separated sheet metal blanks that can be produced separately from the production line or with blanking station constructed as a part of the press. This way feeding the press from coil is possible.
TRANSFER DIE METHOD AND PRODUCTION
The method of production with transfer dies (tools) is based on production of the part being progressively deformed in separate transfer dies mounted in one press. Throughout this process the part is transported from die to die with a transferring device called transfer. Transfer die production method and production process is similar to production method used in presses with progressive die with exception, that in presses mounted with transfer dies, the part is separated from the coil at beginning of (semi)part deformation. Part is transferred from die the die with transfer, being controllably deformed step by step by many dies. Throughout this process the transferred blank is step by step becoming the part being produced.