The method of manufacture of railway wheels

 

(57) Abstract:

Usage: the technology of manufacture of railway wheels by pressure treatment. The inventive method of manufacture of railway wheels includes a draft of the workpiece, the bulk and the forming wheel. In the process of evaporating device is formed of the Central label of a thickness of 0.17-0,33 height upset billet diameter, 0.9-1.1 times the diameter of the hole of the hub. Billets carried out at the ratio of the height of the working part of the lower and upper poulopoulos in the range of 0.6-0.8. 1 Il.

The invention relates to the field of metal forming, in particular, to a technology of allocating railway wheels.

A known method of manufacture of railway wheels (1), including a draft of the workpiece, the rectification of the Central part with the formation of the outline to a depth of 0.6oC0,7 height upset billet with diameter equal 0,150,6oC0,25 its average diameter. After the pickup of the workpiece with the formation of basting produce the firmware of the Central zone of the workpiece. The volume of the Central deleted when flashing zone increases by 1.5 times due to the formation at the bottom of the sedimentary plate Central conical cavity for accountancy.

The known method is applicable in the case when the operation of the firmware to carry out the forming operation. For equipment, when the operation of the firmware is at the final stage of deformation after viginti disk and calibration rim implementation of the known method is not possible.

The objective of the invention is to develop a method of manufacture of railway wheels for equipment which presupposes the firmware of the Central hole in the workpiece at the final stage of deformation

after surgery viginti disk and providing a limit to the expiration of the Central zone of the workpiece up to 7500 cm3in the drive wheel due to the formation of the Central jumpers in the process of acceleration of the workpiece.

The technical result is achieved by the process of evaporating device shall limit the expiry of the Central zone of the workpiece in the radial direction through the formation of the Central lintel with a higher resistance to deformation, of a thickness of 0.17oC0,33 from the height of the mounted workpiece and a diameter of 0.9oC1,1 the diameter of the hole of the hub, and the molding is carried out at the ratio of the height of the working part of the lower and upper poulopoulos within 0.6lane) 0,17oC0,33 height upset billet diameter (dlane), 0.9oC1,1 the diameter of the hub hole (doc). Then produce billets 4 when the ratio of the height of the working part of the lower (LN. O.) and upper (LC. O.poulopoulos within 0.6oC0,8.

Interval thickness and diameter of the Central jumper allows you to obtain the effect of reducing the temperature of the Central zone of the workpiece, amazed axial and off-axis porosity. This implies that during the subsequent molding of the hub two poluprovodni (in the ratio of the working part of the lower and upper poulopoulos within 0.6oC0,8) changes the character of distribution of the Central zone of the original piece in the elements of the wheel: the hub and the disk. So, when the billets without Central jumpers volume of the Central zone of the original piece, the limiting transition from the hub to the wheel disc is 5072 cm3. The design is in the process of evaporating device Central jumpers will increase this volume 5072 cm3up to 7500 cm3. The interval of values of the diameter of the jumper has the following explanation:

the diameter of the jumper 0.9, the diameter of the hole of the hub corresponds to the diameter of the upper district of the folds along the hub hole on the exit jumpers;

the diameter of the jumper, equal to 1.1 times the diameter of the hole of the hub due to technological possibilities for adjusting the alignment of the bridge and the upper polopravdy molding stamp.

Interval thickness jumper has the following explanation:

when the thickness of lintel less 0,17 height upset workpiece is podstugivaniya jumpers and worsens the implementation of the hub along its length;

when the thickness of the lintel height exceeding 0.33 upset billet is reduced positive effect on the distribution of the Central zone of the workpiece in the wheel disc, namely, when the thickness of the lintel height exceeding 0.33 upset procurement Central area of the original piece displacement 7500 cm3distributed in the disk of the wheel, i.e., decreases the positive effect on the distribution of the Central zone of the workpiece along the hub.

The ratio of the height of the working part of the lower and upper poulopoulos within 0.6oC0,8 has the following explanation.

When the size of the pots less than 0.6 on the transition area from the side surface of the hub to the disc is formed fold. When the size of the pots more than 0.8 worsens the execution of the geometric dimensions of the upper cavity of the hub, and which convey the ratio of the sizes of mandrels of 0.8 corresponds to a gap between the mounted workpiece and the lower poulopoulou molding stamp equal to 10 mm

An example of a specific implementation.

For sampling method were selected workpiece complete wheel ingot bottom casting height of 295 mm and a diameter of the protrusions daisies" 515 mm In the original piece in the axial direction are mounted studs 30 mm distance from the axis 75 mm for fixation of the nature of the flow of the metal of the Central zone of the workpiece. The workpiece is deformed in accordance with the present method and the reference method for the production of railway wheels.

In accordance with this method of procurement deformed according to the following scheme: preliminary sediment blanks for descaling, the final sediment floating in the calibration ring, justify the Central part of the billet scalloped punch with the formation of the Central basting diameter equal to 190 mm (1.0 in bore diameter hub), billets 30 mm (0.25 in height upset billet), the billets with the formation of the Central jumper 2 poluprovodni, the ratio of the sizes of the lower and upper poulopoulos was 0.7, according to their dimensions 73 and 105 mm After forming of the blanks cut diametrically of templet and the nature of the flow studs was determined Gras is on the same technological scheme without education Central basting during the pickup of the workpiece. From these blanks were also cut out the templates for the study of metal flow from the Central zone of the workpiece.

The different nature of the Central metal zone in both cases, the results are due to higher resistance to deformation of the Central zone of the workpiece in the presence of a jumper. In this case, the Central area of the workpiece in a largely distributed along the hub before going into drive. When deformation in accordance with this method, the volume of metal of the Central zone of the original piece, limiting the transition from the hub to the disc, is 7503 cm3when the same strain by known techniques, this volume is 5072 cm3.

Thus, the application of this method allows to improve the macrostructure of the wheel, concentrating the Central zone of the workpiece in the wheel hub. Another positive effect of the application of this method is as follows.

When satisfactory macrostructure of the Central zone of the workpiece can be reduced by the amount of metal in wydawca (deleted when flashing wheel parts) with subsequent redistribution of this volume is to increase the width or diameter of the rim. The increase in rim width will improve cacheline same outer diameter of the rim will increase the service life of the wheel in operation.

A method of manufacturing a solid-rolled railway wheels, including a draft of the workpiece in the ring, the rectification of the Central part of the figure the punch with the formation of the Central stitching, forming, rolling, vyybkw and firmware, characterized in that in the process of evaporating device shall limit the expiry of the Central zone of the workpiece in the radial direction through the formation of the Central jumper with a higher resistance to deformation in the thickness 0,17 0,33 height upset billet diameter, 0.9, 1.1 diameter of the hub hole, and forming is carried out at the ratio of the height of the working part of the lower and upper poulopoulos within 0.6 to 0.8.

 

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