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CZ Strakonice as divize Slévárna hliníku - Praha 5

Slunecní námestí c.p. 2540/5, 158 00 Praha 5, Czech Republic
Phone +420(0)383342570 , Fax +420(0)383343005
www.czas.cz

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About us

Company description

Company Activities:

CZ a.s. is a multi-branch company with a tradition of more than 80 years of engineering production. Approximately 80 percent of its production is for the automobile industry. According to available data, the company is one of the largest engineering companies in Southern Bohemia and the entire republic. The company regularly scores in the prestigious CZECH TOP 100 chart and the Exporter of the Year competition. It employs approximately 1400 people and almost 2000 when counting affiliated limited liability companies. Its advantageous location on the outskirts of Strakonice is potentiated by connections to key road and railway lines and the near German border crossing. An important competitive advantage of the company is the comprehensive character of its production capacities, which enables connecting final production divisions to its own extensive foundry and tool shop capacities.

Manufacture of components for the automobile industry
Manufacture of automobile components currently represents the main production programme. It includes, among others, production cooperation with Škoda Auto, consisting of component supply, namely differential boxes and synchronic rings for the MQ 200 gearbox and front covers and cylinder head covers for the new Škoda 1.2 litre three-cylinder motor. Deliveries to other important manufacturers in the automobile industry have been started, focused on components for manufacturing water and oil pumps and turbofans. The entry of CZ into this segment was enabled especially by introducing technology meeting high quality and precision requirements and also due to effective cooperation inside the CZ group. In quality control, production certification according to standards ISO 9002 and VDA 6.1 has been achieved.

Manufacture of turbo-superchargers for supercharging 25 – 400 kW combustion engines
These are designed namely for diesel engines of trucks and utility vehicles, buses, tractors and stationary use. CZ currently produces three basic types: K36, K27 and C1. Types K36 and K27 are originally licensed lines, the C1 line is from our own development (1993). In the field of quality control, the production has been certified according to ISO 9001 standards. It is especially this high product quality, based on many special technologies, that enables 80 percent of production to be exported to demanding international markets. One of the world's larges manufacturers of agricultural technology, the John Deere company, is a key customer of the company. The achieved position of CZ is the result of several years of intensive work. The joint plant CZ-Turbo-Gaz in Nizhny Novgorod helps the division to push through on Eastern markets. This gives CZ a competitive advantage before other turbofan manufacturers. An interesting market for CZ is also China, where the company delivers turbofans for truck manufacturers.

Manufacture of grey and ductile cast iron
The foundry's disposition solution and equipment makes it one of the most advanced in the Czech Republic and in Middle Europe in its technological field. Typical manufactured casts up to 10 kg in weight are ribbed cylinders of air-cooled engines and compressors and turbofan turbine and bearing cases. Casts for the automobile industry represent an increasing share of the foundry's production assortment. The utilised technology (shell forming, Croning method) enable manufacture of most demanding casts. A large share of production is goes to affiliated divisions, especially turbofan manufacture. The foundry's exceptional cast quality, based on a certified DIN EN ISO 9002 and VDA 6.1 quality control system, make it an acceptable supplier of leading European automobile companies. A manual forming shop has been founded, which enables piece or small-run production of casts, approx. up to 100 pieces and weight up to 15 kilograms.

Manufacture of pressure cast aluminium casts
These are designated especially for the automobile and consumer industry. Investment into robotized shops based on 630 t and 1600 t pressure presses has sharply increased its manufacturing potential with higher cast weight (up to 9 kg) and quality. The company has achieved great improvements in the area of quality in last years. Quality control became systematic and production was certified according to both ISO 9002 and VDA 6.1 standards. The sales territory of this division includes, besides the Czech Republic and Slovakia, especially Germany. The share of deliveries for export amounts to three quarters of the total turnover. The offer for cast processing inside the company's production capacities is aimed at the needs of customers as a result of the trend towards components with a higher level of processing.

Tool production
Construction and manufacture of pressure moulds for aluminium and zinc alloys, moulds for plastics and rubber, sheet metal forming tools, tools for precision cutting and special cutting tools. Own tool shop capacities are crucial for smooth production operation of the entire company and timely production innovation; they also secure necessary changes in the production structure. The capacity of tool production is capable of satisfying not only company needs, especially the aluminium and cast iron foundries, but also addressing the most demanding customers, especially from the automobile industry.

Manufacture of DESTA brand reach high-lift trucks
This is a relatively new line of work in CZ. The main product, DV C line trucks with a 2.5 t - 3.5 t maximum load, 3.3 – 8.3 m lift and gas or diesel engines, is being replaced by the new D model line with a maximum load of 2.5 – 5 tons. Accumulator trucks have been markedly innovated in the new E line (max load 1.2 - 2 t). The scope of products also includes terrain high-lift trucks (max load up to 3.5 tons, types DV 3522 TX and DV 35 T4) and high-load trucks (max load up to 8 tons). CZ is methodically focused on the development of new products.

Brief overview of the manufacturing programme of affiliated companies
The products of CZ RETEZY, s.r.o. [CZ CHAINS, Ltd.] are designed for bicycles, motorcycles, automobiles, general engineering, agriculture and other industries. Chains from Strakonice have prevailed on international markets for more than 70 years, especially thanks to the use of modern technology (largely self-made), continuous care for high quality and long product life and also thanks to a wide assortment of manufactured goods and short delivery terms.

CZ Strojírna, s.r.o. [CZ Machine Works] is a renowned manufacturer of high precision grinding machines for openings and round grinding, special grinders for car engine injection pump components, special-purpose connectable machine tools and transfer lines for the automobile industry, levelling machines and many special machines built according to the customers wish. The company has more than 50 years of experience and its sales territory is Europe, the US and Russia.

CZ Gastro, s.r.o. secures canteen meals and deliveries of prepared meals. This activity is carried out in kitchens with canteens in Strakonice and in the KLIMA, a.s plant in Prachatice. For external customers, the company secures deliveries of lunch and dinner meals with its own vehicles. It prepares an average of 3000 meals per day. The buffet produces delicacy products ranging from various salads, open sandwiches, aspics and baguettes up to entire dinner parties and wedding banquets.

Location

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Products

Products

Products:
- Car components
- Turbochargers
- Handling equipment
- Aluminium and iron cast
- Moulds and tools
- Chains
- Machining equipment
- Other activities


CASTINGS

Shell moulding

The production of castings using shell moulding (the Croning method) has a long-term tradition in CZ (since 1956). A combination of shell mould and shell cores is used almost exclusively.

This technology enables the production of castings of high surface quality, dimensional accuracy and relatively complex shapes. It permits production of castings with minimum machining allowances. Shell moulds and cores are produced by shooting and blowing on Hottinger and Shalco machines, while some moulds are produced using mould-making machines with an ASF-CZ tipping case.

The basis for mould production is the COATED SAND. This moulding material is almost 100% recycled after casting and knocking out of castings in the thermal reclamation unit and reused for further mould and core production. The foundry production of CZ minimally burdens the environment by the depositing of foundry sand and other waste.

The finished shell mould ready for casting is loaded into a transport trolley on the foundry line using a handling robot and after passing it through the cooling tunnels; castings are automatically knocked out then. The FDC foundry line is industrial-computer controlled and all transport of moulds, castings and auxiliary materials is managed within controlled cycles using hydraulic manipulators and vibrating transporting troughs. Only mould loading, pouring and removing of raw casts at output from the cooling tunnel are performed manually.


Hand moulding

The technology of hand moulding in self-hardening moulding mixtures with an organic binder based on furan resins is used.

The foundry patterns can be wooden, resin, for the production of unique castings for repair purposes and upon certain modifications, the original defective part can be used as well.

The cores may be of in-house production (furan, shell) or purchased from specialised manufacturers (COLD-BOX and others).

The pouring takes place on a roller foundry conveyer with manual guiding of the pouring ladle and manual movement.

After casting, the used moulding mixture is almost 100% recycled in the mechanical reclamation unit.


Aluminium Foundry

Materials used:
Al Si 9 Cu 3 (Fe) EN 1676 EN-AB 46000 (DIN 226)
Al Si 12 Cu 1 (Fe) EN 1676 EN-AB 47100 (DIN 231)

Minimum and maximum dimensions and weights of casts:
maximum dimension – up to 1,200 cm2 of surface on the mould’s dividing surface
maximum weight – up to 10 kg
minimum weight - from 0.01 kg
The casts are cast in metal moulds on machines under heavy pressure with closing power from 160 to 1,600 tons. The casts are manufactured to tolerances according to CSN 42 14 31, DIN 1688, or according to customer requirements.

Special offer of services:
upon agreement with the customer, we can arrange machining of casts in cooperation with other divisions of CZ a.s., or with external contractors
according to customer request, we will issue certificates for the cast pieces (material and dimensional certificates). To this end, we use a 3D gauging device from Zeiss, a spectrometer, durometers and x-ray systems.
the aluminium foundry house has implemented QMS according to ISO 9001:2000 and DIN EN ISO 9002:1994 and ISO/TS 16949:1999
the casting house has been certified by TÜV CERT - TÜV Management Service Gmbh.

Technology for production of tools, moulds and cutting machines:
The design of pressure moulds is provided by the aluminium foundry house in cooperation with Tool Shop CZ or in cooperation with external contractors. The selection of materials, thermal processing, and production technologies are arranged upon agreement with the supplier as required by the customer.

Competences

Materials

  • Aluminium (alloys)
  • Copper (alloys)

Certificates

  • ISO 9001
  • VDA 6.1