"Madara" JSC is a joint-stock company with main office in Shumen, which is
situated in North East region of Bulgaria. Though the company was established as a joint-stock corporation in 1991, we have great
experience in the production of trucks, front rear and tandem driving and dead axles for trucks, buses, trolleys, roadbuilding
machines, gear wheels, steel castings, forging, tools and instrumental kits and services. Founded as a plant for spare parts in 1958
"Madara" JSC has always been one of the leading Bulgarian companies in its economic groupings producers of trucks, aggregates and
units.
The Steel and Iron Foundry Plant of "Madara" JSC was established in 1958 to produce steel and iron castings for spare
parts with main application purpose in the agricultural engineering.
A reconstruction and modernization work was carried of
the manufacturing facilities was carried out in 1980 and favorable conditions were created for the production of steel castings for
the automotive industry. Now there is a great variety of steel and iron castings manufactured in this plant, intended for
agricultural engineering, freight containers production and general industrial purpose.
From 2002 "Madara" AD is certificied
by EN ISO 9001:2000.
Some details:Steel castings made of carbon, low alloyed steels,
high-tensile steels with good welding qualities, grey irons, and ductile irons.Annual
output is 8 000 tons.The process is carried out in electric arc furnaces completely, working on basic
regime, with bath capacity rated - 4 tons. The temperature control of the liquid metal is done by dipping thermodrill. A quantometer
ARL - 3400 is used for the chemical composition control of the metal.The moulding mixtures and sands
are on the bentonite basis, made in centrifugal mixers of "Speedmullor" type.They are
manufactured according to the hot-box and Croning processes with oil mixtures.There are mechanized
mould lines in flasks of the following dimensions: 600 x 600 x 200 / 200, 600 x 600 x 300 / 250 mm. There is also hand-moulding
worked out in flasks of 1250 x 1250 x 300 / 300 mm. There is a special section for jobbing and small scale production of castings
with big overall dimensions.This process is accomplished by means of drum granulating and grinding
machines (grinders).It includes normalization and annealing, performed in through-type and box
furnaces.- Preliminary Mechanical Treatment:
A set of machines and semi-automatic devices for preliminary and
finishing mechanical treatment of steel castings are used in this process.There is a through-type
installation used for application of antirust coat by dipping.- Models, Foundry Core Boxes and Flasks
Production:
There is a special equipment, tools and production facility available for the manufacturing of wooden, iron and
plastic models / core boxes for all processes and flasks of various size and dimensions.It is
exercised by means of up-to date laboratory equipment for quality control of the moulding materials and sands, as well as of the
ready products.The dynamic iron analysis is made by means of quantometer ARL - 3400. A continious path control is performed over the
moulding and core foundry mixtures and sands as well as of the moulds and foundry cores. An undistructive steel casting control is
applied, which includes magnetic flaw detection and ultrasound. The steel castings are mechanically tested and microstructurally
analyzed.
Contact:
Dipl.Ing. Dobrin Todorov - General Manager
MADARA JSC
1 "Madara" Blvd.,
Industrialzone, 9700 Schumen, BULGARIA
tel.: (++359 54) 61073, 63088, 63473, fax: (++359 54) 50167, 60479
e-mail: office@madaragroup.com
website: www.madaragroup.com
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