Gép, 1977 (29. évfolyam, 1-12. szám)
1977-01-01 / 1. szám
SCIENTIFIC SOCIETY OF MECHANICAL ENGINEERING Voi. 29. Nr 1. 1-40. JANUARY 1977. Basa, F.—Nainar, J.: Optimation of highly stressed traction drives .................................................................... 1 Authors expound the problems of design, technology and operation in connection with traction gear drives of locomotives having electric power transmission, as well as experiment^ and tests carried out in Czechoslovakia for solving them. Problems of heat treatment and lubrication are being dealt with particularly. Pósjalci Dr., Ödön: Mechanical behaviour of fibrereinforced orthotropic systems of materials............ 8 Mechanical tests were carried out on two-component bodies consisting of materials with linear elasticity, based upon deformation energy accumulated in the material system. The elasticity equation of the complex body furnishes a description of the mechanical behaviour of the material system and permits determination of the Poisson’s figures and Young’s modules characteristic for the compound body. The equations of the material characteristics involve both ductile and non-ductile fibres. Bolla, László—Czenthe, Szabolcs: Research and Development in the Field of Integrated Production Systems .................................................................................. 13 Automation of the entire production process in the case of small and medium batch production can be realized by means of integrated material and data processing systems. The paper furnishes a summary of the objectives of domestic development work, of the conception and the development tasks of the system projected at the Csepel Machine Tool Factory. Ecsedi Dr., István: Sizing splitting membranes according to the theory of small elastic-plastic deformation .................................................................................. 16 The paper deals with the determination of the tensile pressure of splitting membranes with given dimensions and of given material, using the theory of small elastic-plastic deformation. The material of the membrane is supposed to harden in a linear way. The tensile pressure pk is determined in the presumption that the value of maximum stress intensity when splitting the membrane is equal to the tensile strength erB of the membrane’s material. The process as exposed is being demonstrated by means of a numerical example. Molnár, László: Geometry of Antifriction Bearings, Bearing Gap II....................................................................... 23 The paper deals with the geometrical design of most frequently used roller bearings. Including the paper published in the previous issue of our periodical and having for subject the geometrical problems in connection with ball bearings, the complex of geometrical knowledge is being summarized, systematized and complemented in respect of antifriction bearings, which the design engineer can utilize in his work. Vörös Dr., Imre: Plastic gears running with high speed under high temperatures................................... 27 Author determines the heat resistance of plastic gears by means of a Vicat’s device. Elongation and stress diagrams show the tensile strength under room temperature and at the temperature of combustion engines of approx. 100 °C. It can be stated that inaccuracies are greater in the case of injection moulded gears and therefore these are less suitable for high-speed drives, than machined gears. Investigations have been carried out according to the Vicat’s test with gears made of highly heat-resistent plastic materials. Based upon the equations of fatigue diagrams it is possible to determine through extrapolation the stress value to be used for dimensioning, presuming a peripheral speed of 20 m/s and a service life of 5,000 hours of operation. Nekanda Dr.,-Trepka, L.—Sobiá, T.: Research work in Poland in the field of resistance welding of concrete reinforcing steel .............................................. 35 The paper offers an overview of the research work performed in Poland during these recent years in the field of resistance welding of concrete reinforcement. The technological aspects of welding reinforcing steel, as well as the practical possibilities of obtaining welded joints of highest possible strength are being expounded. In this respect the paper deals foremost with resistance welding of reinforcements made of steel of higher strength. * * * Advertisement orders to be sent to: MH-Advertising, 1818 Budapest (Telex: 22-5341 hungarpublic-bp. Phone: 183-640, Cables: Mahir Budapest) Subscriptions from abroad through KULTURA Foreign Trade Co. (H—1389 Budapest, P. O. B. 149). Subscription price to be paid either by cheque along with the order, or simultaneously by remittance in favour of the account No. 024—7 of KULTURA with the Hungarian National Bank (H—1850, Budapest). Subscription price: US $ 12 for a year GÉP