Two stage die set

• US 5,722,280 A
• Filed: 03/20/1997
• Issued: 03/03/1998
• Est. Priority Date: 07/10/1992
• Status: Expired due to Fees

• Current Assignee: Rotary Press Systems, Inc.
• Original Assignee: Rotary Press Systems, Inc.
• Inventors: Bodnar, Ernest Robert
• Primary Examiner(s): Larson, Lowell A.
• Application Number:
  US08/822,181
• Time in Patent Office: 348 Days
• Field of Search: 72/184, 72/190, 72/327, 72/328, 72/335, 72/185, 72/186
• US Class Current: 72/186
• CPC Class Codes: B21D 22/04 for dimpling combined with perforating B21D28/24
• CPC Class Codes: B21D 28/36 using rotatable work or tool holders

Abstract

A two stage die set for sequentially blanking an opening in a work piece, and thereafter forming edges of the work piece around the opening and having a male die assembly, having a male blanking die, a male forming die spaced from the male blanking die, and a recess therebetween, a female die assembly having a generally hollow female die sleeve, the die sleeves being shaped and dimensioned to correspond to the shape of the male blanking die and to receive it in telescopic relation, a moveable support plate located around the female die sleeve the moveable plate being biassed so as to urge it into a first extended position, and the moveable plate yielding to the male forming die of the male die assembly, when the male and female dies are closed together, so that the male blanking die, in co-operation with the female die sleeve blanks out a portion of a work piece and forms an opening, and upon further relative movement between the male and female dies towards one another, the male forming die co-operates with moveable plate and the female die sleeve, to cause deformation of an edge portion of the work piece around the opening.

Claims

1. A two stage die set for use in a rotary apparatus, having upper and lower rotary members, and having at least one generally semi-cylindrical die support member in each of said upper and lower rotary members, for sequentially blanking an opening in a work piece, and thereafter forming edge formations on said work piece around said opening and being characterized by:

a male die assembly (14), in turn comprising a male blanking die member (30) defining a male blanking edge (48);

a male forming die member (32) spaced from said male blanking die member (30) defining a male forming corner (50);

recess means (34) between said blanking die (30) and said forming die (32);

a female die assembly (16) in turn comprising a generally hollow female die sleeve member (52), said female die sleeve member (52) being shaped and dimensioned to correspond to said male blanking die member (30) and to receive the same in telescopic relation and defining inner and outer sides;

wherein said male die assembly (14) is supported on said semi-cylindrical die support member (10) of said upper rotary apparatus and wherein said female die assembly (16) is supported on said semi-cylindrical die support member (12) of said lower rotary apparatus, and having upper spring recess means (44,

     42) in said upper semi-cylindrical die support member (10), and including lower spring recess means (76,

     78) in said lower semi-cylindrical die support member (12);

blanking edge means (60) on the inner side of said female die sleeve (52);

forming corner means (62) on the outer side of said female die sleeve (52);

a moveable female support plate means (64) located around said outer side of said female die sleeve member (52), and pressure means (76) operable on said moveable female support plate means (64), whereby to urge the same into a first position, and said moveable plate means (64) being adapted to yield to said male forming die member (32) of said male die assembly (14), when said male and female dies (14,

     16) are closed together, whereby said male blanking die (30) co-operates with said female die sleeve (52) of said female die assembly (16) to blank out a portion of a work piece (W) and form an opening therein, and whereby upon further relative movement between said male and female die assemblies (14,

     16) towards one another, said male forming die sleeve (32) will co-operated with said moveable support plate means (64) and said female die sleeve (52), to cause deformation of an edge portion of said work piece (W) around said opening;

wherein said female die sleeve (52) defines a predetermined first height, and wherein said movable support plate means (64), in its said first position, defines a predetermined second height, greater than said first height, whereby upon closing of said male and female die assemblies (14,

     16), said work piece (W) is initially clamped between said male forming die member (32) and said moveable support plate means (64), just prior to blanking of said opening, and said work piece (W) is blanked prior to any deformation thereof;

ejector means (38) in said male blanking die member (30), said ejector means (38) being resiliently moveable, whereby the same may be withdrawn into said blanking die member (30), upon closure of said blanking die member (30) on said work piece (W), and, after blanking of said portion of said work piece (W) by said male and female die members, said ejector means (38) being adapted to be extended from said male blanking die (30), whereby to displace said blanking out portion; and

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passageway means (88) in said female die assembly (16) communicating with the interior of said female die sleeve (52) for receiving said blanked out portion of said work piece (W), whereby the same may be disposed of through said passageway means.

2. A two stage die set as claimed in claim 1 and wherein said female die assembly (16) includes a movable support plate means (64) in the form of a generally rectangular plate, edge rib means (72,72) on said plate (64), extending outwardly from opposite sides of said plate (64), and a pair of retaining rails (80,80), defining retaining ribs (82,82) interengaging with said edge ribs (72,72), said retaining rails (80,80) defining spaces enclosed by said retaining ribs (82,82), whereby said edge ribs (72,72) may move relative thereto within said spaces.

3. A two stage die set as claimed in claim 2 and including die support means (10,12) for supporting said male and female die assemblies (14,16), recess means (42,78) in said die support means (10,12), and spring means (44--44) extending between said recess means (42--42) and said male die assembly (14) and spring means (76--76) extending from said recess means (78,78) and said female die assembly (16), and means (46,84) for securing respective said male and female die assemblies (14,16) to respective said support means (10,12).

4. A two stage die set as claimed in claim 1 and including slug ejection opening means (58) in said lower semi-cylindrical die support member (12) for receiving a slug (S) from said female die, and ejecting the same.

5. A two stage die set as claimed in claim 4 and wherein said female assembly (16) includes a female hollow die sleeve (52), of regular section from top to bottom, and a female die base member (54), defining ledge means (56) engaging the lower end of said hollow die sleeve (52), and opening means (58) in said die base member (54) registering with said hollow female die sleeve (52), said die base member (54) being attachable to said die support member (12), for supporting said hollow die sleeve (52) in position, and securing means (86) for securing said hollow die sleeve (52) to said die base member (54).

6. A two stage die set as claimed in claim 5, and wherein said die base member (54) defines a generally frusto-conical shape, and wherein said movable plate means (64) defines an interior generally frusto-conical recess, shaped to substantially correspond to said frusto-conical shape of said die base (54), whereby said mounting plate means (64) may be moved over and around said die base means (54).

7. A two stage die set as claimed in claim 1 wherein said female die sleeve (52) defines in plan, a shape having at least some linear portions (92--92) and having radiussed corners (94--94) joining said linear portions (92--92), and wherein said linear portions (92--92) define a predetermined first width, and wherein said radiussed corners (94--94) define a predetermined second width less than said first width.

8. In combination with a rotary apparatus, having upper and lower rotary members, and having at least one generally semi-cylindrical die support member in each of said upper and lower rotary members, and wherein two-stage die sets having a male die assembly (14) supported on said semi-cylindrical die support member (10) of said upper rotary apparatus and a female die assembly (16) supported on said semi-cylindrical die support member (12) of said lower rotary apparatus, each of said die sets being characterized by:

a male die assembly (14), in turn comprising a male blanking die member (30) defining a make blanking edge (48);

a male forming die member (32) spaced from said male blanking die member (30) defining a male forming corner (50);

recess means (34) between said blanking die (30) and said forming die (32);

a female die assembly (16) in turn comprising a generally hollow female die sleeve member (52), said female die sleeve member (52) being shaped and dimensioned to correspond to said male blanking die member (30) and to receive the same in telescopic relation and defining inner and outer sides;

and having upper spring recess means (44,

     42) in said upper semi-cylindrical die support member (10), and including lower semi-cylindrical die support member (12);

blanking edge means (60) on the inner side of said female die sleeve (52);

forming corner means (62) on the outer side of said female die sleeve (52);

a moveable female support plate means (64) located around said outer side of said female die sleeve member (52), and pressure means (76) operable on said moveable female support plate means (64), whereby to urge the same into a first position, and said moveable plate means (64) being adapted to yield to said male forming die member (32) of said male die assembly (14), when said male and female dies (14,

     16) are closed together, whereby said male blanking die (30) co-operates with said female die sleeve (52) of said female die assembly (16) to blank out a portion of a work piece (W) and form an opening therein, and whereby upon further relative movement between said male and female die assemblies (14,

     16) towards one another, said male forming die sleeve (32) will co-operated with said moveable support plate means (64) and said female die sleeve (52), to cause deformation of an edge portion of said work piece (W) around said opening;

wherein said female die sleeve (52) defines a predetermined first height, and wherein said movable support plate means (64), in its said first position, defines a predetermined second height, greater than said first height, whereby upon closing of said male and female die assemblies (14,

     16), said work piece (W) is initially clamped between said male forming die member (32) and said moveable support plate means (64), just prior to blanking of said opening, and said work piece (W) is blanked prior to any deformation thereof;

ejector means (38) in said male blanking die member (30), said ejector means (38) being resiliently moveable, whereby the same may be withdrawn into said blanking die member (30), upon closure of said blanking die member (30) on said work piece (W), and, after blanking of said portion of said work piece (W) by said male and female die members, said ejector means (38) being adapted to be extended from said male blanking die (30), whereby to displace said blanked out portion; and

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passageway means (88) in said female die assembly (16) communicating with the interior of said female die sleeve (52) for receiving said blanked out portion of said work piece (W), whereby the same may be disposed of through said passageway means.

9. The combination as claimed in claim 8 and wherein said female die assembly (16) includes a movable support plate means (64) is in the form of a generally rectangular plate, edge rib means (72,72) on said plate (64), extending outwardly from opposite sides of said plate (64), and a pair of retaining rails (80,80), defining retaining ribs (82,82) interengaging with said edge ribs (72,72), said retaining rails (80,80) defining spaces enclosed by said retaining ribs (82,82), whereby said edge ribs (72,72) may move relative thereto within said spaces.

10. The combination as claimed in claim 9 and including die support means (10,12) for supporting said male and female die assemblies (14,16), recess means (42,78) in said die support means (10,12), and spring means (44--44) extending between said recess means (42--42) and said male die assembly (14) and spring means (76--76) extending from said recess means (78,78) and said female die assembly (16), and means (46,84) for securing respective said male and female die assemblies (14,16) to respective said support means (10,12).

11. The combination as claimed in claim 10 and including slug ejection opening means (58) in said lower semi-cylindrical die support member (12) for receiving a slug (S) from said female die, and ejecting the same.

12. The combination as claimed in claim 11 and wherein said female die assembly (16) includes a female hollow die sleeve (52), of regular section from top to bottom, and a female die base member (54) defining ledge means (56) engaging the lower end of said hollow die sleeve (52), and opening means (58) in said die base member (54) registering with said hollow female die sleeve (52) said die base member (54) being attachable to said die support member (12), for supporting said hollow die sleeve (52) in position, and securing means (86) for securing said hollow die sleeve (52) to said die base member (54).

13. The combination as claimed in claim 11, and wherein said die base member (54) defines a generally frusto-conical shape, and wherein said movable plate means (64) defines an interior generally frusto-conical recess, shaped to substantially correspond to said frusto-conical shape of said die base (54), whereby said mounting plate means (64) may be moved over and around said die base means (54).

14. The combination as claimed in claim 8 wherein said female die sleeve (52) defines in plan, a shape having at least some linear portions (92--92) and having radiussed corners (94--94) joining said linear portions (92--92), and wherein said linear portions (92--92) define a predetermined first width, and wherein said radiussed corners (94--94) define a predetermined second width less than said first width.