Preskov AD, founded in 1900, is one of the oldest and biggest manufacturers of hot forged parts in Bulgaria that are made of carbon and alloyed steel.
The company produces a wide range of forgings with weight from 0.500 kg to 55 kg. The products are used in various branches such as energy industry, machine engineering, auto and railway transport, agriculture, hydraulics, mining, manufacture of lifting and construction machines.
The tool manufacturing process (design and construction of dies for presses and air-steam hammer) is backed by the advanced IDEAS CAD-CAM system as well as by the Q-FORM forging simulating program which helps the manufacturing process optimization.
Preskov AD has implemented certificates for design, development and manufacture of forgings and tooling including EN ISO 9001:2000 quality management system and EN ISO 14001:2004 environmental management system.
The production facilities of the company are situated in the industrial area of the city of Stara Zagora. They include preparation shop, forging shop, thermal treatment shop and cleaning shop.
Preparatory workshop
- The preparatory shop is equipped with press shears – 230 t, 315 t, 500 t, 630 t and 1000 t.
- Mostly round bars are used and the maximum size is with diameter up to 160 mm.
- In addition to press shears there are band saws and hydraulic cutters.
Press-forging workshop
- 5 press forging lines equipped with eccentric press 1600 t, induction heater 800 kW and trimming press 160 t – max. weight of forging is 6 kg and a diameter of approximately 170 mm.
- 3 press forging lines equipped with eccentric press 2500 t, induction heater 1000 kW and trimming press 250 t – max. weight of forging is 17 kg and a diameter up to 234 mm.
- Hydraulic hammer 125 kJ
- Hydraulic hammer forging line - 125 kJ (8 t ) with induction heater 1200 kW and trimming press 630 t, forgings of max. weight - about 55 kg and a diameter up to 500 mm.
- Forging lines HFM (horizontal forging machines)
- HFM 800 t - 1 pc.
- HFM 1200 t - 1 pc.
- HFM 1250 t - 1 pc.
- Maximum size of the flange driven in is of diameter about 190 mm.
- Friction press line 250 t, gas heater and trimming press 400 t.
- Calibration presses – 3 pcs.
Heat treatment workshop
This workshop is equipped with a new advanced thermal treatment line of MTSystems, Italy for thermal treatment, hardening and normalization, with a capacity of 2800 kg/hour. The line is completely automated and has high speed recuperating gas burners. The hardening shall be in polymer. The company also has a large number of chamber furnaces servicing the tool manufacture.
Cleaning workshop
The workshop is equipped with two shot blasting machines. The larger one is with a capacity of
1.5 t/hour.
Tool workshop
The company has its own tool manufacture. It is based on universal lathes and milling machines, copying milling machines, programmable milling machines and spark erosion machines. The largest die that can be manufactured is with dimensions 1000 х 1000 х 600 mm.
Design and technological workshop
- The company has its own department for technical development of design documentation. Chemical, mechanical and metallurgical laboratories
- The company is equipped with chemical laboratory with LEKO apparatus, measuring the sulphur and carbon content as well as measuring the chemical components in the steel.
- There is also a mechanical tests laboratory, metallurgical laboratory and metrological study the structure of the steel.
Quality systems
Preskov AD has implemented certificates for design, development and manufacture of forgings and tooling including EN ISO 9001:2000 quality management system and EN ISO 14001:2004 environmental management system.
Investments. Preskov AD implemented a project for technological modernization of the equipment under the EU Operational Programme “Competitiveness” amounting 11 million BGN and including the purchase of:
- A new hydraulic hammer of Lasco, Germany – 125 kJ, with vibration-insulation springs of Gerb, Germany, which allows range of the products up to 55 kg;
- A new completely automated thermal line of MTSystems, Italy for thermal treatment, hardening and normalization with a capacity of 2800 kg/hour;
- 5 new induction heaters of ELIND, Italy with transport feeding devices which increase the productivity of the forging lines;
- 10 cooling towers of Evapco, Italy bought from Euromarket Bulgaria allowing the construction of a modern infrastructure of the cooling flows;
- 2 new compressors.
