Cutting – Processes – Plural cutting steps
Patent
1993-03-04
1995-03-28
Phan, Hien H.
Cutting
Processes
Plural cutting steps
83139, 83530, 83682, 83916, B21D 2826, B21D 2836
Patent
active
054006821
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method of side cutting by a turret punch press for punching a plate form work.
BACKGROUND OF THE INVENTION
A turret punch press is designed to include an upper turret and a lower turret and to punch a plate form workpiece between a punch provided on the upper turret and a die provided on the lower turret.
On the other hand, it is possible to perform a side cutting for cutting a workpiece by continuously moving the above-mentioned punch up and down. As the side-cutting method, a method disclosed in Japanese Unexamined Patent Publication No., 63-130228 is known.
The side cutting method disclosed in the above-identified publication is that a punch provided with three stage edges, i.e. an upper edge, an intermediate edge and a lower edge, is driven up and down by means of a hydraulic cylinder for performing the side-cutting with the lower and intermediate edges, punching piece retained in a die is cut by means of the upper edge when a predetermined amount of the punching piece is retained, and the side cutting is again performed thereafter. The lower, intermediate and upper edges to be used for cutting are selected by controlling the stroke of the hydraulic cylinder.
However, in the above-mentioned side cutting method, since the punch is driven through a substantially small stroke to perform the side cutting with the lower and the intermediate edges, a dimension to be cut in a single stroke is relatively small and such as to require long process period. Furthermore, a saw-tooth like trace is frequently formed along the cutting surface to degrade the product quality.
Further, since the punching piece is cut while it is retained in a predetermined position in the die, a drooping can be created on the workpiece to degrade the product quality when the side cutting process is performed along a relatively long dimension.
SUMMARY OF THE INVENTION
In view of the problems set forth above, it is a primary object of the present invention to provide a side cutting method which utilizes a turret punch press and which permits longer dimension in one stroke of a punch chip so as to significantly improve the processing efficiency.
Another object of the invention is to provide a side cutting method which utilizes a turret punch press which can avoid the formation of a residual drooping portion on the cut portion and further reduce the formation of a saw-tooth like trace along a steering surface.
In order to accomplish the above-mentioned primary object, there is provided, in accordance with the first aspect of the present invention, a method of side-cutting by a turret punch press comprising the steps of performing a side cutting for a workpiece with predetermined one of a plurality of punch chips which are provided in a punch assembly mounted on an upper turret and adapted to be selectively impacted, and cutting off one end of a portion to be a punching piece by cutting in the side-cutting process by means of another one of punch chips.
In order to accomplish above-mentioned various objects, there is provided, in accordance with the second aspect of the invention, a method of side-cutting by a turret punch press comprising the steps of performing a side cutting for a workpiece with predetermined one of a plurality of punch chips which are provided in a punch assembly mounted on an upper turret and adapted to be selectively impacted, cutting off one end of a portion to be a punching piece by cutting in the side-cutting process by means of another one of punch chips, and again performing the side cutting with the one of the punch chips continuing from a remained cut portion, and repeating a cycle consisted of the each steps.
The present invention achieves the following advantages. Namely, using one of a plurality of punch chip provided in a punch assembly, the side-cutting process for the workpiece is performed, initially. Then, the punching piece formed by the side-cutting is cut off by means of another punch chip. Repeating the foregoing operation, the side-cutt
REFERENCES:
patent: 4250785 (1981-02-01), Morishita
patent: 4738173 (1988-04-01), Kiuch
patent: 4771663 (1988-09-01), Naito et al.
patent: 4986153 (1991-01-01), Matrak et al.
patent: 5044239 (1991-09-01), Endo et al.
Kabushiki Kaisha Komatsu Seisakusho
Kananen Ronald P.
Phan Hien H.
LandOfFree
Method of side-cutting by turret punch press does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of side-cutting by turret punch press, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of side-cutting by turret punch press will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2243569