Metal deforming – With cutting – By shearing tool-couple
Patent
1995-03-16
1996-12-17
Crane, Daniel C.
Metal deforming
With cutting
By shearing tool-couple
72336, 72339, 72414, 72404, B21D 2814
Patent
active
055842046
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/JP93/00595, filed May 6, 1993.
TECHNICAL FIELD
The present invention relates to a die for molding a metallic gasket which is interposed between joining surfaces of a cylinder head and a cylinder block of an internal combustion engine and is fastened by a bolt.
PRIOR ART
As dies for molding a metallic gasket which is interposed between joining surfaces of a cylinder head and a cylinder block of an internal combustion engine and is fastened by a bolt, there have been heretofore developed a die used for a processing method by way of a single step which comprises the steps of piercing and blanking each gasket by means of a single blank piercing die and thereafter beading, and a progressive beading die which comprises piercing, beading and blanking a metallic gasket by way of progressive stamping of a web-like metallic plate.
FIGS. 5(a) and 5(b) are respectively sectional views showing essential parts of a conventional press progressive beading die. In FIGS. 5(a) and 5(b), an upper bead in-peripheral base plate 11 is secured to an upper holder 14a on the male side, and a convex member 18 having a predetermined pressing line for forming a convex bead is fixedly mounted in the outer periphery of the upper bead peripheral base plate 11 in such a way that the convex member 18 is projected through a predetermined width. Further, a stripper 15 adjusted in height through a stopper 17 is provided in the outer periphery of the convex member 18 in the state where the stripper 15 is resiliently urged in a pressing direction through a spring 22 relative to the upper holder 14a.
On the other hand, on a lower holder 14b on the female side, a lower bead in-peripheral base plate 12 is fixed internally and a die 16 is fixed externally, boring a slit 19 having a predetermined width according to the pressing line of the convex member 18 on the male side.
These stripper 15 and the die 16 are juxtaposed to a blanking die in the press progressive die. A blanking punch 20 is fixedly mounted on the upper holder 14a while being juxtaposed to the stripper 15. The die 16 and the lower holder 14b are formed with blanking holes 21 for receiving a blanking punch 20. In the pressing of the blanking punch 20, the blanking punch 20 moves into the blanking hole 21 to provide a predetermined configuration of a metallic gasket in accordance with a boundary line.
In such a convex beading die as described above, in the pressing and molding, the convex member 18 causes a metallic plate 10 to press into the slit 19 to form a convex bead 10b.
The lower bead in-peripheral base plate 12 is set to have the same level as the die 16. The upper bead in-peripheral base plate 11 is set to have the same level as the stripper 15. The piercing, the beading and the blanking of the metallic gasket can be subjected to the collective progressive stamping of a web-like metallic plate. At this time, the pressure contact between the pair of upper and lower bead in-peripheral base plates 11 and 12 to press and mold a bead in-peripheral flat plate portion 10a of the metallic gasket, the stripper 15 always resiliently keeps the surface pressure between the former and the die 16 by the urging force of the spring 22 to prevent the occurrence of struggle and creases of a bead out-peripheral flat plate portion 10c and to press and mold the bead out-peripheral flat plate portion 10c as a part of a beading die.
However, in the progressive convex beading die as described above, the die 16 is merely secured in the state independently of the lower die bead base plate 14b in a narrow range between the slit 19 and the blanking hole 21, and is always in the state of being short of strength.
In the drawing of the convex bead 10b, the convex member 18 presses a bead part of the metallic gasket against the slit 19 in a direction as indicated by the arrow in FIG. 5(a). As a result, the width of the slit 19 between the lower bead inperipheral base plate 11 and the die 16 is forced open. For this reason, the die 16 is flexed toward the blanking hole 2
REFERENCES:
patent: 2150384 (1939-03-01), MacLagan
patent: 5226306 (1993-07-01), Yoshino
Crane Daniel C.
Kabushikikaisha Ket & Ket
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