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High-strength materials for cold volume forming - an assortment of wires and rods.

Development of technology for the manufacturing and
processing of wires and rods designed for the manufacturing
of high-strength pressings in strength class 800-1200 mpa
(mega pascals) without final heat treatment.

The aim of the proposed project is development and optimisation of technology for production and processing of materials (in assortment of wires and rods) designed for manufacture of high-strength pressed pieces in strength class 800-1200 MPa (one strength degree 800-950 MPa and one degree 950-1200 MPa) without final heat treatment. The end-targeted technology of production and subsequent processing of materials would ensure the required final strength in the interval given above, together with guaranteed cold formability (ductility A5 minimum 15% or 12% and contraction minimum 30 J/cm2 up to -30 degrees Celcius and stability of the given parameters also at elevated temperatures of up to 300 degrees Celcius. In the course of the project solution there will be analysed influence of structure and sub-structure character of the input material. Impact of the size and character of cold deformation will also be investigated. The influence of individual parameters will be verified in pilot and in industrial operation conditions and subsequent determination of permissible interval for production of individual strength degrees in the above mentioned range. A programme will be developed for modelling of the cold volume forming process, including development of individual strength plastic characteristics and fatigue characteristics. The aim of this programme is the computer design of manufacturing technology on the basis of knowledge of final construction with respect to the required final parameters. Considering the fact that in the course of manufacture of most components there is uneven distribution of deformation in material, the final material (product) is also non-homogenous from the viewpoint of final strength-plastic parameters after cold volume forming. In case of conventional production technology, final properties in volume of material are homogenised at final heat treatment. Owing to the fact that the proposed technology does not comprise thermal treatment it is necessary to propose, with the use of mathematical modelling, optimal parameters of input material and technology of its cold forming. Technological processes obtained in this manner will be experimentally verified both by pilot and industrial scale testing. On the basis of experimental results the production technology will be corrected and a mathematical model developed to reflect given chemical composition and dimension assortment of wires and rods. During all experimental tests emphasis will be on research of service non-standardised properties of the mentioned materials and specific machine parts made from these materials. Properties specific for individual products will also be investigated. Knowledge of the whole complex of strength plastic and service properties is absolutely necessary for application of material for production of individual machine parts, namely components for the automotive industry. It is presumed that the developed material and technology of its production would also be applied,in certain cases, to the manufacture of safety components for the automotive industry. In the course of solution, resistance to fatigue, ageing of material, material brittle fracture properties at temperatures to minus 30 degrees C and stability of properties in the course of ageing will also be investigated in detail. Tests of basic strength plastic parameters will be investigated in laboratory conditions. Service characteristics will then be studied on testing machines in manufacturing plants - always on specific machine components. At the same time mutual links between strength plastic and structural characteristics of hot-rolled wires and rods and between cold ductility will be verified experimentally. At production of concrete fastening and joining parts and other machine components it will be necessary for successful implementation of the developed manufacturing technology to process this material (and possibly the technology) and to prepare relevant standards (corporate, Czech, ESN, DIN, ISO). Keywords: hot rolling, cold drawing, cold forming.
Project ID: 
1 983
Start date: 
03-04-1998
Project Duration: 
36months
Project costs: 
590 000.00€
Technological Area: 
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Market Area: 
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Raising the productivity and competitiveness of European businesses through technology. Boosting national economies on the international market, and strengthening the basis for sustainable prosperity and employment.