Cutting – Tool or tool with support – Joint or connection
Patent
1992-09-17
1994-07-05
Jones, Eugenia
Cutting
Tool or tool with support
Joint or connection
83559, 836391, B21D 2836
Patent
active
053257553
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a punch press operation for a punching and forming operation for a plate form work.
BACKGROUND ART OF THE INVENTION
Conventionally, a turret punch press is known as a device for punching and forming of plate form work. In this type of arrangement, a plurality of dies are required to be set in a turret prior to commencing operation.
A plurality of patent applications have been filed with respect to the various components of this type of device.
For example, Japanese Examined Patent Publication (Kokoku) No. 54-17973, Japanese Examined Patent Publication No. 54-6751, Japanese Unexamined Patent Publication (Kokai) No. 56-119626, Japanese Unexamined Patent Publication No. 60-106630 and Japanese Unexamined Patent Publication No. 60-106631 disclose technologies for positioning and exchanging of dies.
On the other hand, for example, Japanese Unexamined Patent Publication No. 63-130225, Japanese Unexamined Patent Publication No. 63-130226, Japanese Unexamined Patent Publication No. 63-130227, Japanese Unexamined Patent Publication No. 63-130228, Japanese Examined Utility Model Publication No. 64-3546, Japanese Unexamined Utility Model Publication No. 62-127318 and Japanese Examined Patent Publication No. 59-44940 disclose technologies for controlling strokes of upper dies or for rotating turrets.
All of these technologies relate to the turret punch press. The turret punch press includes upper and lower turrets which rotate in synchronism with each other. However, the construction which controls this synchronous rotation is complicated and expensive.
SUMMARY OF THE INVENTION
In view of the above mentioned drawback, it is an object of the present invention to provide a punch press which does not require a turret and an associated driving device, which has a simple construction can be easily handled, produced at low cost, and, in addition, exhibits highly reliable operation.
In order to accomplish the above-mentioned objects, a punch press, according to the first aspect of the invention, comprises:
an upper main shaft vertically movable by means of a hydraulic driving means and rotatable for indexing by a rotary driving means;
a lower main shaft positioned below the upper main shaft and rotatable in synchronism with the upper main shaft for indexing;
an upper die detachably mounted on the lower end of the upper main shaft and being automatically exchangeable;
a lower die detachably mounted on the upper end of the lower main shaft in opposition to the upper die and being automatically exchangeable;
an upper clamping device for clamping the upper die on the upper main shaft with positioning in phase; and
a lower clamping device for clamping the lower die on the lower main shaft with positioning in phase.
According to the second aspect of the invention, there is provided a punch press as set forth in the first aspect, in which the lower main shaft is movable in a vertical direction by means of another hydraulic drive means.
According to the third aspect of the invention, there is provided a punch press as set forth in connection with the first aspect, in which the lowering speed and driving force for the upper main shaft are controlled by detecting the vertical position of the upper main shaft.
The advantages of the present invention having the construction as set forth above, are as follows. Namely, since punching can be performed between the upper which is mounted on the upper main shaft and which can be driven vertically by the hydraulic device, and the lower die which is mounted on the lower main shaft and which can be synchronously rotated with the upper main shaft, it becomes possible to perform the punching operation at an optimal speed depending upon the material, thickness and intended configuration by controlling the hydraulic pressure by detecting the position of the main shaft and thus enable high precision products to be obtained.
By providing necessary dies at the side of the automatic exchanging device, the dies mounted on the upper and lower m
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patent: 3495493 (1970-02-01), Herb et al.
patent: 3548700 (1970-12-01), Herzog
patent: 3762264 (1973-10-01), Scott
patent: 3779122 (1973-12-01), Sawvell
patent: 4206667 (1980-06-01), Hirata et al.
patent: 4532845 (1985-08-01), Jinnouchi
patent: 4624165 (1986-11-01), Bredow et al.
patent: 4869141 (1989-09-01), Klingel
Jones Eugenia
Kabushiki Kaisha Komatsu Seisakusho
Kananen Ronald P.
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