SU1761374A1 - Method of preparing intermediate products of seamless wheels for swaging and rolling - Google Patents

Abstract

The use of metal forming, in particular the production of solid-rolled railway wheels. The invention, the pre-slump, the slump in the process ring and the distillation of the workpiece are performed in one operation. At the preliminary precipitation stage, descaling is carried out from the sedimentary plate. Descaling is carried out at a slow sedimentation rate. The workpiece is distilled with the simultaneous release of force from sedimentary plates 4 silt

Description

The invention relates to the field of metal forming and can be used in the manufacture of solid-rolled railway wheels,

A known method of production of solid-rolled wheels, including pre-draft, draft in the process ring, distillation, molding of the rim, disc and hub, rolling, bending of the disc and calibration, piercing the hole. There is also known a device for carrying out this method, which is a series of presses, one of which produces a free draft of the workpiece in smooth plates, then a deposit of smooth plates in the floating calibration ring and the opening of the workpiece with a punch by the second move of the mobile beam on the next press. to feed the punch into the interstitial space, it is necessary to make a full return stroke of the crosspiece of the press. The disadvantages of the known method and device are the use of two separate presses for preliminary precipitation and precipitation in the calibration ring, and another working stroke of the second press is provided for the distillation, which increases the volume of equipment for the manufacture of wheel blanks and leads to a prolongation of the processing time of the blank on the second press .

There is a known method of manufacturing solid-rolled railway wheels, which, in the first press, involves depositing a billet into a bun, calibrating the outer surface and basting (distillation) of the central hole with a landing centering along the bottom surface of the bun.

There is a known method of making (precipitation of blanks) of railway wheels, providing for the consecutively performing at one position the draft of the lower smooth plate and the upper figured one with a ledge for acceleration and draft in the upper floating calibration ring, using the upper ejector for udale (L

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No billet from the calibration ring. The disadvantage of the known method is to perform the distillation from the first moment of precipitation, i.e. from the moment the preform touches the profiled upper sedimentary plate, which does not guarantee the concentricity of the lateral surface of the preform after calibration in the floating ring with respect to the distillation performed beforehand and leads to the marriage of the preform.

A common drawback of the known methods is the need to perform each operation with a separate working stroke of the press, as well as the need to feed a calibration ring to the first press table and clean it after the second working stroke, which lengthens the processing cycle of the workpiece.

A known method of manufacturing ring products, including heating the billet, its draft with the forced restriction of metal flow from its ends, the distillation by two punches from opposite sides to different depths of penetration, piercing the hole with subsequent rolling.

The disadvantages of this method are that metal outflow during distillation occurs only in the radial direction. The operation of settling the workpiece and descaling is performed separately. This limits the performance of the line.

This method of manufacturing ring products was chosen as a prototype, as the closest to the technical essence of the solution.

The purpose of the invention is to improve the quality of the blanks and reduce the energy intensity of the process.

The goal is achieved by the fact that in the method of preparation of blanks of solid-rolled wheels for stamping and rolling, including pre-slump of the workpiece combined in one technical operation, slump in the process ring by sludge plates and distillation of the metal of the central zone of the workpiece by a punch, at the stage of preliminary draft with slowed down to 45 mm / s, the rate of descaling is carried out from the sedimentary plate, and the workpiece is distilled after precipitation is completed in the process ring with simultaneous removal of reinforcement with sedimentary plates.

FIG. The scheme of preparation of railway solid-rolled wheels blanks for stamping and rolling is presented.

FIG. 1 shows the original blank; FIG. 2 shows the intermediate time of precipitation of the workpiece and the removal of scale; on fig.Z - billet after precipitation and calibration in the top

calibrating ring, figure 4 - distillation of the workpiece by the internal punch.

The implementation of the proposed method is explained by the device, which is a vertical hydraulic press, on a movable cross bar of which the upper sediment plate 1 is fixed and the bottom smooth sediment plate 2 is fixed on the press table, and the upper sediment plate 1 is rigidly fixed

5 with respect to the calibration ring 3, and in the middle part has a hole where the pickup punch 4 is installed, the centering calibration cap 3. The pickup punch 4 is equipped with an autonomous

0 is driven (not shown) and placed inside the upper sedimentary plate, so that in the initial position its working end surface protrudes relative to the working surface of the plate by the value of the transition radius from the side to the end surface of the punch. The implementation of the method is shown by the example of its specific implementation.

Heated to a deformation temperature (1200 ° C), the workpiece 5, weighing 470 kg, height

0 420 mm, the manipulator-shifter is installed on the center of the lower smooth sedimentary plate 2 of the hydraulic press with a force of 4000 tf. During the feeding of the workpiece, the filling is applied to its upper end.

5 based borax to improve the conditions for scale delamination. The press stroke is activated. Starting from the moment the preform 5 touches the punch 4, the dross from the side surfaces of the sediment precipitates cinder b, which is blown off from the lower sedimentary plate with water or air supplied through the nozzle 7 of the descaling unit. The speed of the working stroke at the same time slowed down to 45 mm / s. After termination of the precipitation in the calibration technological ring 3, when the gap between the end of the ring and the bottom plate decreases to 20 mm, the force is removed from the upper sediment plate 1 and the punch 4 performs the distillation of the central metal.

0 parts of the workpiece.

Effort on punch 1600 tf. The height of the resulting workpiece 105 mm. The larger diameter of the base of the cone faces the bottom plate. If necessary, the accelerating punch with a power reserve of up to 100 mm can serve as an upper ejector.

The introduction of a method for preparing pre-rolled wheels blanks for stamping and rolling can significantly reduce

energy consumption, reduce the amount of equipment, improve the quality of supplies.

Claims (1)

The invention of the method of preparation of blanks of solid-rolled wheels for stamping and rolling, including the preliminary draft of plates combined in one technological operation, the deposit in the technological process 0 the ring and the distillation of the metal of the central zone of the workpiece by a punch, characterized in that, in order to improve the quality of the workpieces and reduce the energy intensity of the process, at the stage of preliminary precipitation, descaling is carried out from the sedimentary plate at a deformed rate slowed down to 45 mm / s produced with simultaneous removal of force from sedimentary plates. Vzfa .2 Fig.z Fig. /