Production profile of  FOUNDRY "HB SLEVARNA spol. s r.o."

The foundry “HB Slevarna” is oriented on production of castings particularly for automotive industry, such as e.g. valve tappets for passenger vehicles and trucks, engine and compressor cylinders, vented brake discs, exhaust manifold, crankshaft gears, etc. 
Our approach to manufacturing of these castings accentuates high quality and minimum rate of rejects, narrow range of chemical composition, high dimensional accuracy and timely fulfilment of orders. 
It goes without saying that we strictly adhere to special request of our customers such as e.g. height of quenched layer in as cast state with high level of hardness in case of valve tappets or keep very narrow range of chemical composition in case of castings of vented brake discs made of special grey cast iron. 

You will find among our customers major car-makers, such as VW-Skoda, TATRA, LIAZ, and also ZOS Zvolen ZTS Cadca, SAUER, SIGMA PUMPY.

Apart from the castings mentioned above we produce also artistic decorative castings (ornamental railings, fireplace frames and doors, etc.)



GREY CAST IRON

Castings made of grey cast iron are determined mainly for automotive industry, mining industry and mechanical engineering. Moulds and cores are made with use of HOT-BOX or COLD-BOX methods, which ensures high precision of castings.



MELTING OF CAST IRON

Cast iron according to the following standards: CSN 42 24 15 (GG-15), CSN 42 24 20 (GG-20), CSN 42 24 25 (GG-25), 

Melting of cast iron is made in electric medium frequency furnaces.

MANUFACTURING OF MOULDS

MACHINE MOULDING HOT-BOX, COLD-BOX

Moulds and cores are manufactured by shooting at semi-automatic machines 

- mass of castings from 0.15 Kg to 20 Kg
- accuracy of castings according to the standard CSN 01 44 70.3 (±0,2 mm)
- max. dimension of castings – length 400 – width 300 – height 120 mm
- high series are preferred, preferably exceeding 20 000 pieces


MOULDING SHOP SINGLE PIECE PRODUCTION AND SMALL-LOT PRODUCTION 

- mass of castings from 0.5 Kg to 100 Kg
- accuracy according to the standard CSN 01 44 70.4
- classical manual manufacturing of moulds for free models or on moulding plates with laying on train of rollers of sand bed (max, dimension of the frame is 1000x1000x250mm)
- manufacturing of moulds from a bentonite moulding mixture, cores are made of self-setting mixture 
- machine moulding – moulding machines FOROMAT 30 – dimension of the moulding frame 780x520x140/140mm

Manual moulding shop is focused also on manufacturing of special castings of blade crankshaft gear wheels and moving wheels of ventilators for coal-mines, decorative – artistic cast iron, fireplace and furnace parts, etc. 
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