Tool changing – Process
Patent
1996-11-15
1998-05-26
Briggs, William R.
Tool changing
Process
72446, 100918, 483 28, B23Q 3155
Patent
active
057556539
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a press die exchanging method in which a series of press die sets are successively exchanged in a press system by using one or more carrier vehicles.
BACKGROUND ART
In a conventional press system such as a transfer press, in order to facilitate an exchange of die sets, it has been customary to provide the press system with a moving bolster that is designed to be capable of having a die set introduced into and then removed from the interior of the press system.
For example, in Japanese Unexamined Utility Model Publication No. Sho 62-142,429, there is disclosed a transfer press in which a plurality of moving bolsters are provided within a press system, and in which each time die sets are to be exchanged, such moving bolsters along with die sets having been used in a preceding pressing stage are conveyed out of the interior of the press system while the remaining or separate standby moving bolsters are conveyed along with die sets next to be used into the interior of the press system, thereby exchanging die sets having been used with die sets to be used in a next pressing stage within the interior of the press system.
Also, it is seen that in a transfer press as, for example, disclosed by Japanese Examined Utility Model Publication No. Hei 5-15,435 a plurality of moving bolsters are also included as capable of being introduced into and removed from the interior of the press system. In this case, if the moving bolsters received in the interior of the press system are interspaced with a reduced distance, an attempt have been made to reduce the width of an upright column of the press system to be less than the spacing between the moving bolsters so that when the moving bolsters are conveyed out of the interior of the press system, they may have no interference with any upright column within of the press system.
It has been noted, however, that a conventional press system that is provided with a moving bolster in any manner as in the above mentioned prior art, does require such a moving bolster as being not only rigid but also large sized in order for a heavy forming weight imposed on a die set to be supported by a bed of the press system through the moving bolster.
To this end, a comparison can be made with a case in which a die set is installed directly upon the press bed. The use of a moving bolster will make the entire height of the press system higher by the height of the moving bolster, thus making the entire press system enlarged in size and, as a result, requiring a building that is elevated in height sufficient to house the enlarged press system. This is certainly uneconomical.
Also, if the press system is increased in its total height, it follows that it will be reduced in its rigidity, thus developing such inconveniences as a drop in processing accuracy and the likelihood of a vibration to be generated.
Further, a moving bolster, which entails a traveling system for it to be self-propelled and a means for a power supply needed to the traveling system, will have to be complicated in structure and highly costly. In addition, the press system with a moving bolster necessitates subsidiary facilities such as a means for displacing the moving bolster up and down within the press system and a means for clamping the moving bolster onto the press bed, and hence must become more costly than is more convenient.
Accordingly, the present invention has been made to eliminate these inconveniences, and has for its generic object to provide a method of exchanging die sets in a press system, which method enables die sets to be exchanged without having to use a moving bolster, enhances the rigidity of the press system and allows a press forming to be performed with a high precision, while permitting a building in which the entire press system is installed to be lower in its height and further rendering the entire press system installation less expensive.
SUMMARY OF THE INVENTION
In order to achieve the object mentioned above, there is provided in accordance with the
REFERENCES:
patent: 4614108 (1986-09-01), Bolle et al.
patent: 4995255 (1991-02-01), Noda
patent: 5040403 (1991-08-01), Henderson et al.
patent: 5063648 (1991-11-01), Yonezawa et al.
Briggs William R.
Komatsu Ltd.
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