Metal deforming – With means to drive tool – Including gear-actuated tool support
Patent
1995-02-24
1997-04-15
Jones, David
Metal deforming
With means to drive tool
Including gear-actuated tool support
74 52, B21J 918
Patent
active
056198841
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an automatic forming machine, in particular an eccentric forging or crank press, for hot forging workpieces which are conveyed stepwise through a forging region, having a driven eccentric shaft on which there is mounted a connecting rod connected to the tool carriage, which can be moved up and down and with which there is associated an irregular drive having a stationary, internally toothed hollow gear meshing with a planet pinion gear.
DE-AS 2 061 043 discloses a die forging press (eccentric press, wedge press or the like) having automatic workpiece transport, in which walking beams and an automatic drive associated therewith are provided for transporting the workpiece from die to die. The walking beams receive the workpiece between them and are provided with suitable gear systems which enable raising and lowering, closing and opening and longitudinal movement of the walking beams.
The result is that the maximum production rates per unit of time depend on the minimum cycle time, which in the case of a fully automatic forming machine is generally determined by the time for transporting the forged pieces from one die to the next. In addition to transporting the forged pieces, during this time the following functions (handling) also take place: press stroke up and down, discharge of the forged pieces by mechanical dischargers above and below, cleaning, cooling and application of lubricant to the dies. In the case of cold and semi-hot metal forming of the forged pieces, the press stroke is slowed down to the extent necessary for the transporting time. Thus, speeds (cycle time) of 20 to 30 rpm can be used there without disadvantages for the forged pieces. In contrast, such speeds are not possible with hot forging, since in the event of excessively low speeds the die contact times become too high, with the consequence of an abruptly reduced service life of the dies. For this reason, with hot forging in practice eccentric forging presses are operated--depending on the size of the press--at speeds between 50 and 70 rpm. However, this means that taking into account the required cycle times continuous operation is not possible and in general even fully automatic forming machines (eccentric forging or crank press) have to be used in switched operation. This necessitates, after each revolution of the eccentric shaft, coupling and deceleration. In automatic operation with walking beam systems, minimum cycle times of approximately 2.5 to 3.5 seconds are then possible.
SUMMARY OF THE INVENTION
The object of the invention is thus to provide an automatic forming machine in particular an eccentric forging and crank press of the type mentioned at the outset in which an irregular drive enables the build-up of the high force required for operating the press and which enables continuous operation even with hot forging.
According to the invention, this object is achieved in that there is associated with the eccentric shaft an irregular drive. Because of the irregular drive, it is possible to provide a slow-running eccentric or crank press having the die contact time of a fast-running press which is therefore suitable for continuous operation with an automated stroke system. This is because a pushrod which is stationary in its top position can be achieved so that more time is available for the automated walking beam system and the other secondary activities (handling) which have to be carried out.
For this reason, it is proposed that the irregular drive be constructed as a planet gear system having a stroke rest position of the tool carriage at the top reversal point. Because the tool carriage has no more travel to cover at the top reversal point, while a high speed is reached in the region of the bottom reversal point, coupling and deceleration on each press stroke can be dispensed with. Rather, this is only still necessary on switching the forging press on and off.
In accordance with a preferred embodiment, the planet gear system has a stationary, internally toothed holl
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patent: 4137797 (1979-02-01), Brems
patent: 4223568 (1980-09-01), Brems
patent: 4697466 (1987-10-01), Sugawara et al.
Eumuco-Hasenclever GmbH
Jones David
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