SU1271897A1 - Arrangement for hardening necks of crankshafts - Google Patents

Description

Equal in rigidity and length of the spring 9 and 10 hold the lever 6 relative to the hinge 8 in the middle position when the hinges 5 and 7 of the suspension 3 are located in a horizontal plane. When the lever 4 is deflected on the hinge 13 from its vertical position, it is operated in opposite directions of the spring 11 and 12. To retract the inductor 2 to the loading position in the crankshaft installation of that shaft, there is an air cylinder 14,

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The installation also has ycTpoiicrBu for fastening and rotating the crankshaft. When the shaft rotates, the inductor 2 monitors the surface hardened by the neck under the action of the spring 12, and the inertial forces are balanced by the springs 9, 10, 11, 12. The installation design is simplified due to the masses of the moving parts being minimized. Contains no additional items. 7 il.

The invention relates to the heat treatment of parts when heated with a high frequency current, namely to installations for hardening the crankshaft journals.

The aim of the invention is to simplify the design of the plant for hardening the crankshaft journals.

FIG. 1 shows the location of the inductor and the transformer at the moment when they are set aside for mounting the shaft; in fig. 2 - the same, when, after installing the shaft, the inductor with its stops touches the hardened neck; in fig. 3-5 - the positions of the inductor and the transformer that they occupy during the rotation of the hardened shaft, when the latter is rotated (from the position shown in Fig. 2) 1/4, 2/4 and 3/4 of a turn clockwise, during quenching the crank journals, when hardening the root journals, after installing the shaft in the center, the inductor and the transformer can be considered practically immobile, since their movement can be caused only if the root journal is not concentric to the center line; in fig. 6 shows a top view of the installation if the shaft is quenched in two positions.

The plant for hardening the crankshaft journals contains a transformer 1 and an inductor 2 rigidly connected to it, which are mounted on a four-hinged lever suspension 3. The lever 4 of the suspension is connected by a hinge 5 s; center of mass of the transformer with inductor. The lever 6 is connected to the transformer by a hinge 7. The upper end of the lever 6 passes through the axis 8 of the hinge. Equal in rigidity and length of the spring 9 and 10 hold the lever 6 in its middle position, i.e. in position, when the hinge 7 is in the same horizontal plane with the hinge 5 (Figs. 1, 2 and 4). The springs 11 and 12 act on the lever 4 if it deviates from its vertical position on the hinge 13 (Fig. 3 and 5). Pneumatic cylinder 14 and the rod 15 are used for removal of the inductor 2 when installing the hardened shaft in the centers 16.

Installation for hardening necks of crankshafts works as follows.

To install the shaft to be quenched, the inductors 2 are diluted with pneumatic cylinders 14, the rods 15 of which act on the levers 4 (Fig. 1). The hardenable shaft is fed from bottom to top (indicated by an arrow, fig. 1). Then the rods 15 are retracted (Fig. 2), the inductors 2 approach the quenched necks and rest on them (Fig. 2). Moving them under the action of springs 12.

The shaft turns on (clockwise), and then a high-frequency current is supplied to the transformer 1 and the inductors 2, the heating starts (the buses for which the current is supplied are not shown).

Claims (1)

When the shaft rotates 90 from one position (Fig. 2) into another (Fig. 3) under the action of springs 12, the inductor and the transformer follow the shaft, supported by their stops on the surface of the hardened neck. 3 In this case, the inductors and transformers turn under the neck in a counterclockwise direction about their centers of mass and compress the springs 9 (left) and 10 (right), in the position shown in fig. 3, the springs 11 and 12 do not press the levers 4. With further shaft rotation clockwise another 90 from one position (FIG. 3) to another (FIG. 4), the inductor and the transformer move inertia behind the shaft and compress the springs 11 The inductor 2 and transformer 1 rotate in hinge 5 in a clockwise direction, releasing the springs 9. When rotated another 90 ° from one position (Fig. 4) to another (Fig. 5), the inductors and transformers turn clockwise, compressing the springs 10 (left) and 9 (right), the center of mass (hinge 5) under the action of the springs 11 follows the hardened neck. With further rotation of the shaft, the system comes to the position shown in FIG. 2, and then the entire cycle of movements is repeated. In order for the forces in the springs 9-12 to balance the forces of inertia arising in the installation, it is necessary 974 to deform the springs, which are; proportional to the angles of rotation of the lever 4 relative to the point of its suspension and the inductor - transformer relative to their center of mass, were proportional to the forces of inertia. Thus, the invention makes it possible to simplify the construction of a plant for hardening the crankshaft journals while maintaining a stable, quenching quality; An apparatus for quenching crankshaft necks, comprising centers for fastening and rotating a shaft and a transformer with an inductor, mounted on a double-lever suspension device connected to the transformer by two hinges, one of which is aligned with the center of mass of the transformer and inductor, characterized in that in order to simplify the design, the suspension arms are spring-loaded in the plane of their rolling in opposite directions, and the other hinge is mounted with the possibility of displacement along the suspension lever. f-f    " Ittmt t one R 5