Metal deforming – With means to drive tool – Including pneumatic- or fluid-actuated tool support
Patent
1985-08-19
1987-04-21
Spruill, R. L.
Metal deforming
With means to drive tool
Including pneumatic- or fluid-actuated tool support
7245307, 72454, 72430, 72706, B21J 918
Patent
active
046586296
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a National Phase corresponding to PCT/CH83/00141 filed Dec. 14, 1983 and based upon Swiss National Application 7400/82-4 of Dec. 20, 1982.
FIELD OF THE INVENTION
This invention concerns a press which particularly is used for the manufacture of products formed by compacting, sintering, pressing, with the aid of a mold or by forging, molding surface pressing, or the like.
More specifically this invention relates to a press which is versatile to be used as a hydraulic press, as a pneumatic press, as a hydraulic-pneumatic press or as a combined hydraulic-explosion press.
BACKGROUND OF THE INVENTION
Numerous hydraulic, pneumatic presses are already known. However, these presses are generally very space consuming. Furthermore it is necessary to provide a comparatively expensive and complicated device for the programming of these pneumatic or hydraulic presses, if during the manufacture of the product various pressures are desired in succession.
Regarding the use of an explosion press for the finishing of metallic products it may, for instance, be noted that these are only mentioned in the book "Meyers Handbuch uber die Technik" ("Meyers Handbook of Technology") published by Bibliographisches Institute Mannheim (page 286).
It seems that the main problem of using the press as an explosion press for the manufacture of pressed, molded, or forged products is the exact dosing of the quantity of the explosive material or the explosion power necessary to perform a given degree of work within a short and regular time interval.
OBJECT OF THE INVENTION
The principal object of this invention is to provide a press which may be used as a hydraulic press, as a pneumatic press, as a hydraulic-pneumatic press, or as a combined pneumatic-explosion press, which occupies little space and which has an operating cycle which may be very simply automated. Furthermore with the press according to the invention, various pressure heads can be achieved during one operating cycle thanks to a positive control of the pressure exerted on the pressing tool.
These objects are achieved with a press which is particularly used for the manufacture of products formed with and of a mold by compacting, sintering or pressing, or which serves for the manufacture of, for instance, metallic products formed by molding, forging, surface pressing, or the like, and which has a pressing tool fixed at the end of a moveable cylinder and a device to move this cylinder, and to exert a predetermined pressure on this cylinder and the pressing tool. According to the invention the elements for moving and applying power to the pressing tool are hydraulic, pneumatic, hydraulic-pneumatic or combined pneumatic-explosion elements.
According to another feature of the invention the moveable cylinder of the press is coaxially positioned inside a fixed guiding cylinder, which is coaxially fixed by suspension inside a cylinder forming an outer wall of the press, whereby this fixed guiding cylinder and the outer-wall cylinder are carried by a supporting platform of the press with their respective upper flange ends.
According to another feature of the invention, the central moveable cylinder of the press has a constriction on which rests a moveable separating wall with an outer cylindrical part which slides sealingly along the inner wall of the outer cylinder in order to form a first chamber of changeable volume filled with a hydraulic medium. The hydraulic elements for the press can comprise a large number of hydraulic cylinders which are crown-shaped and positioned around the central moveable cylinder in the first chamber of changeable volume and the moveable separating wall. Each of these hydraulic cylinders has a free differential piston defining an upper and a lower chamber, whereby the upper chamber of each hydraulic cylinder is fed with a hydraulic pressing element by a pump, and whereby the lower chamber is connected with the first chamber of moveable volume regarding the element.
The hydraulic pressure f
REFERENCES:
patent: 3320740 (1967-05-01), Hamkins
patent: 3654799 (1972-04-01), Dischler
patent: 4166375 (1979-09-01), Stepantsov
patent: 4442694 (1984-04-01), Fusser et al.
Dubno Herbert
Jones David B.
PTP Patentierte Technologische Prozesse AG
Ross Karl F.
Spruill R. L.
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