Cutting – Processes – With reorientation of tool between cuts
Reexamination Certificate
2000-06-02
2003-01-14
Shoap, Allan N. (Department: 3724)
Cutting
Processes
With reorientation of tool between cuts
C083S220000
Reexamination Certificate
active
06505535
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
The present invention is related to Japanese patent application No. Hei. 11-158422, filed Jun. 4, 1999,
FIELD OF THE INVENTION
This invention relates to a method for manufacturing a press-formed, and more particularly, for manufacturing a press-formed object having a plurality of different holes such as a nozzle hole plate of a fuel injector.
BACKGROUND OF THE INVENTION
To punch an angled hole in a sheet, generally, a die unit must be provided which enables a punch to slide at an angle with respect to the sheet. Such a device is disclosed in Japanese Unexamined Patent Publication No. 207600/1991. A die unit set forth in this publication can be used to make a press-formed object having first and second holes, whose diameters are equal and whose punch directions are symmetrical about a direction normal to the sheet. In this publication, the first hole is first press-formed. Then, the die unit is rotated about a direction normal to the sheet, and the second hole is press-formed.
However, when the die unit is rotated (moved) to form the second hole, the position of the die with respect to the sheet (the workpiece) shifts. It is therefore necessary to adjust the position of the die unit with respect to the sheet (this adjustment is hereinafter referred to as a positioning operation). This operation is carried out after the die unit is rotated (moved).
Consequently, when a die unit is rotated every time one hole is punched for manufacturing press-formed objects, at least one positioning operation occurs during the manufacture of each press-formed object. This increases manufacturing man-hours (manufacturing time). As a result, productivity is lowered, thus making it difficult to achieve manufacturing cost reductions. This especially impacts large volume manufacturing. The present invention was developed in light of these drawbacks.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to improve the productivity of manufacturing a press-formed object having a plurality of holes.
To achieve this and other objects, a first and second aspect of the present invention provides a first step of press forming a plurality of first holes in a sheet while feeding the sheet in a first direction through a press. In a second step, a second plurality of holes are formed in the sheet while feeding the sheet in a second direction. A third step is provided which cuts the sheet to predetermined dimensions.
In another aspect of the present invention, a press apparatus comprising a feed mechanism capable of switching between a first feeding state and a second feeding state is provided. In the first feeding state, the press apparatus feeds a sheet one way. In the second feeding state, the press apparatus feeds the sheet in the opposite direction. A die unit is provided having a punch and a die for punching first and second holes in the sheet. A table unit is provided which is capable of supporting and moving the die unit with respect to the sheet. As a result, productivity is increased according to that described above.
Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are intended for purposes of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
REFERENCES:
patent: 1053694 (1913-02-01), Anderson
patent: 1469757 (1923-10-01), Sibley, II
patent: 3083926 (1963-04-01), Herr
patent: 3854355 (1974-12-01), Anefall
patent: 4144783 (1979-03-01), Yamazaki et al.
patent: 4602541 (1986-07-01), Benzinger et al.
patent: 5744213 (1998-04-01), Nelson
patent: 5794501 (1998-08-01), Sasaki et al.
patent: 6009787 (2000-01-01), Hanggi
patent: A-3-207600 (1991-09-01), None
patent: A-8-10870 (1996-01-01), None
Dekita Hiroyuki
Kurita Mikiya
Kuzuno Motofumi
Nagasaka Katsumi
Ohta Kouichi
Choi Stephen
Shoap Allan N.
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