Swaging machine

Metal deforming – By use of tool acting during relative rotation between tool... – Work-hammering tool

Reexamination Certificate

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Details

C072S403000

Reexamination Certificate

active

06308546

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to a swaging machine for swaging rod-shaped or tubular workpieces comprising an annular forging box mounted in a machine frame so as to be rotated and driven about the axis of movement of the workpiece, where in radial recesses of said forging box forging punches are accommodated, which are acting against each other and are vertically movable via a lifting drive while the forging box rotates at the same time.
DESCRIPTION OF THE PRIOR ART
With a comparatively simple machine concept, these swaging machines provide for swaging with forging tools radially striking against the workpiece and rotating relative to the workpiece, whereby an angular displacement of the deformation planes is obtained and zones of increased stress on the material in the overlap region of the tools are avoided. In the known swaging machines, however, an adjustment of the vertical position of the forging punches or the forging tools during a forging operation is only possible to a restricted extent by means of wedge plates for the forging punches divided into a drive-end ram and a tool-end tool carrier, so that the punch length and thus the vertical position of the tools can be adjusted by more or less inserting the wedge plates between ram and tool carrier.
SUMMARY OF THE INVENTION
It is therefore the object underlying the invention to create a swaging machine as described above, where the vertical position of the forging punches can be adjusted economically, and which also provides for larger adjustments of the vertical position during a forging operation.
This object is solved by the invention in that in a manner known per se the forging punches comprise two parts screw-connected with each other, a drive-end upper part rotatably guided in the forging box and a tool-end lower part non-rotatably guided in the forging box, where the upper part has associated thereto a transmission with a gear rim non-rotatably, but axially movably seated at the upper part and rotatably, but axially immovably mounted in the forging box, and a drive gear rotatably mounted in the forging box, which drive gears are part of a planetary gear system.
By dividing the forging punches into a rotatable upper part and a non-rotatable lower part screwed thereto, a simple and functionally reliable adjustment of the vertical position is possible, as a rotation of the upper part involves a change in length of the forging punch because of the screw connection with the lower part and accordingly changes the vertical position as desired. It should merely be ensured that the rotary movement of the upper part does not impair the lifting drive, which can be achieved in various ways depending on the respective kind of drive. For rotating the upper part there are provided transmissions including drive gears each associated to the upper parts, which drive gears cooperate with a suitable planetary gear system, so that an adjustment of the vertical position can be achieved via a corresponding drive of the planetary gear system. The transmission for the drive connection of drive gear and gear rim preferably is a worm gear, where the worm wheel forms the gear rim and the worm cooperating with the worm wheel is in drive connection with the drive gear. In a simple and economic way it is therefore possible to change the respective vertical position of the forging tools, which adjustment of the vertical position can be performed both during the down-time of the machine and during the operation of the machine.
A simple construction is obtained when the planetary gear system has a sun wheel rotatably and drivably mounted at the forging box coaxial to the axis of movement, with which sun wheel the drive gears rotatable about an axis of rotation parallel to the axis of movement are meshing as planet wheels. When the sun wheel rotates with the same rotational speed as the forging box, there is no rotation relative to the drive gears, and the vertical position of the forging punches remains unchanged. But when the sun wheel is rotated relative to the machine box, the transmissions and thus the upper part of the forging punches are rotated via the drive gears and there is an adjustment of the vertical position.
When the drive gears of the transmissions of two forging punches disposed opposite each other each have associated thereto their own planetary gear system, the vertical position of pairs of forging punches can be adjusted differently, in that the respectively associated transmissions are driven differently, which is for instance expedient when forging tubular workpieces over an arbor, so that by forging a slightly oval cross-section forging the workpiece onto the arbor can be prevented.
In principle, the vertical position adjusting means can be combined with any suitable lifting drive, when the rotatability of the upper part of the forging punch is ensured. It is, however, particularly advantageous when an eccentric drive is provided as lifting drive for the forging punches and, to effect a drive connection, the forging punches form a slide face for a sliding block rotatably seated at the eccentric on the end face of the upper part facing the eccentric, where upper part and sliding block are purely frictionally connected with each other, and pressure springs supported at the forging box on the one hand and at flange projections of the lower part on the other hand pressurize the forging punches and urge the upper parts and their slide faces against the sliding blocks. This lifting drive not only utilizes the advantages of an eccentric drive for the lifting drive, but because of the lack of a positive connection between upper part and sliding block, the forging punch can not only be moved transversely but can also be rotated, so that without additional relatively rotatable coupling parts or the like the adjustment of the vertical position can also be performed during the operation. In addition, the proper use of the forging tools on the one hand and the perfect application of pressure via the pressure springs on the other hand are ensured because of the non-rotatable lower part, where by a corresponding adaptation of the spring excursion or the bias of the pressure springs possibly required changes in the application of pressure can be compensated.


REFERENCES:
patent: 3066555 (1962-12-01), Burnel
patent: 404 441 (1998-11-01), None

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