摘要:
This invention generally relates to a method for the thermomechanical treatment of semi-finished products of high-alloy steel. Typically, the method involves initially heating the steel semi-finished product to at least 1200° C., after which the semi-finished product is cooled and then reheated to a forming temperature, at which the semi-finished product is formed. Afterwards, the formed product is then cooled to ambient temperature.
摘要:
A compact drive unit is predominantly intended for traction vehicles, especially for rail vehicles. This invention allows significant reduction of volume and weight of drive units. The drive unit comprises high-speed electrical motor (1) with passive cooling, which is supplied by power electronics converter (2), whose rotor is supported by bearings (3) along with pinion gear (4) of the input spur/helical gear (5). The output shaft (6) of the gear (5) is a part of the next following gear (7). Output shaft of this gear (7) can be connected either directly or by using the coupling (12) to the axle (8) of the traction vehicle, or to the wheel (9). Alternatively, in case the higher transmission ratio is required, it can be connected to another gears (10), where the output shaft of the gears (10) is connected to the wheel (9), or to the axle (8) of the traction vehicle directly or by using the coupling (12). The drive unit can be equipped with brake (13).
摘要:
The present invention generally relates to the modification of a deep-drawing sheet blank (P) for electric resistance heating. Generally, the modified sheet blank comprises slits (Z) being made in the edges of the blank (P) transversely to the electric current flow and oriented towards the perimeter of the forming zone (T). The distances between the ends of the slits (Z) and the forming zone (T) perimeter may be equal. The ends of the slits (Z) oriented towards the forming zone perimeter (T) may also be rounded.
摘要:
This invention generally relates to a method for producing steel parts by creating multiphase microstructures within the steel parts. Typically, the microstructures comprise low-stress martensite with increased ductility and stabilized retained austenite. The microstructures may be formed by cooling the steel parts to a temperature around the martensite start temperature (Ms) and subsequently holding the steel part at a temperature around the Ms in order to equalize the temperature throughout the steel part. Afterwards, the formation of the microstructures and the desired properties is completed by subjecting the steel part to a final cooling in still air.
摘要:
The rotor of the turbine is monitored by sensors of the rotor vibrations arranged in at least one plane of measuring perpendicular to the axis of the rotor and by sensors of the absolute vibrations of the bearings. When using this method of processing, synchronically digitalized signals of the sensors of rotor vibrations, first the arithmetic mean of the individual harmonic bands in full spectrum in the frequency domain is calculated, by which means the information about the subharmonic components and their multiples in the full spectrum of these signals is transferred into the frequency band −1X to 1X, at the same time is by the calculation of the median estimated the level of the signal noise, with which individual frequency bands of the full spectrum are encumbered, and which is subtracted from the amplitudes in the individual frequency bands of full spectrum of the signals of the sensors.
摘要:
The rotor of the turbine is monitored by sensors of the rotor vibrations arranged in at least one plane of measuring perpendicular to the axis of the rotor and by sensors of the absolute vibrations of the bearings. When using this method of processing, synchronically digitalized signals of the sensors of rotor vibrations, first the arithmetic mean of the individual harmonic bands in full spectrum in the frequency domain is calculated, by which means the information about the subharmonic components and their multiples in the full spectrum of these signals is transferred into the frequency band −1X to 1X, at the same time is by the calculation of the median estimated the level of the signal noise, with which individual frequency bands of the full spectrum are encumbered, and which is subtracted from the amplitudes in the individual frequency bands of full spectrum of the signals of the sensors.
摘要:
The present invention generally relates to the modification of a deep-drawing sheet blank (P) for electric resistance heating. Generally, the modified sheet blank comprises slits (Z) being made in the edges of the blank (P) transversely to the electric current flow and oriented towards the perimeter of the forming zone (T). The distances between the ends of the slits (Z) and the forming zone (T) perimeter may be equal. The ends of the slits (Z) oriented towards the forming zone perimeter (T) may also be rounded.
摘要:
This invention generally relates to a method of manufacturing hybrid parts comprising metallic and non-metallic materials at high temperature. During the method, a hollow metallic feedstock heated to a temperature in the austenite region may be placed in a die and filled with a non-metallic material in a viscous condition, after which the feedstock in the die is formed and then controlled-cooled to cause hardening of the non-metallic material in the region of contact between the metallic and non-metallic material. Afterwards, the semi-finished product is removed from the die and cooled to room temperature. The rate of cooling may be adjusted to generate compressive stress in the surface layer of the non-metallic material, which reduces the risk of cracking.