Method of and apparatus for coining tapers at opposite ends of a sleeve member
AssigneePresnet Corporation
InventorReynald Sansoucy
Life of this patent
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Abstract
A method of and apparatus for coining tapers at opposite end faces of a sleeve member in which upper and lower punches are displaced relative to upper and lower dies, respectively, before start of a coining operation, to engage the opposite end faces of the sleeve member. Thereafter, the upper die is advanced together with the upper punch to effect coining. The sleeve member is supported at both its opposite end faces during the entire coining operation.
Claims9
A method of coining at least one of opposite end faces of a sleeve member with an apparatus including a first die having a first bore portion for receiving the sleeve member therein, said first bore portion having a first diameter corresponding to an outer diameter of the sleeve member, and a transition surface defining a coining surface;
- a rod member extending through said first bore portion for completely supporting the sleeve member internally along its longitudinal extend;
- a first punch being independently movable with respect to said rod member extending through said first bore portion for engaging the at least one end face of the sleeve member to support the sleeve member during the coining;
- and a second die cooperating with said first die to effect a coining operation, and a second punch extending in said second die for engaging the other of said opposite end faces of the sleeve member to support the sleeve during coining, said method comprising the steps of:
- loading the sleeve member on the supporting rod and introducing said sleeve into said first bore portion;
- advancing the first and second punches into engagement with the opposite end faces of the sleeve member;
- compressing said sleeve between said punches by forcing said first and second punches toward each other;
- advancing at least one of said dies to effect the coining operation while the sleeve member is being continuously compressed from the opposite faces thereof by said second punch and said first punch;
- withdrawing said at least one advanced die to an initial position thereof;
- and
- ejecting the coined sleeve member.
An apparatus for coining at least one of two opposite ends of a sleeve member having a central longitudinal guide bore on a press having a displacable slide, said apparatus comprising:
- a first die having a bore with a first bore portion for receiving the sleeve member therein, said first bore portion having a first diameter corresponding to an outer diameter of the sleeve member, and a transition surface defining a coining surface, said first die being stationarily supported;
- a rod member extending through said bore of said die for extending through said guide bore and completely supporting the sleeve member internally along its longitudinal extent;
- a first punch being independently movable with respect to said rod member and having an annular end face, said first punch extending into said bore;
- first means for advancing said first punch at least to an edge of said transition surface and for maintaining said first punch in continuous compressive contact with one said sleeve member end during the coining cycle;
- second means for advancing said first punch into said first bore portion of said first die to eject the sleeve member after a coining operation has been completed;
- second die means cooperating with said first die to effect the coining operation and comprising a second punch having an annular end face;
- third means for advancing said second punch end face into continuous compressive engagement with the other end of said sleeve member during the coining cycle;
- and
- fourth means for advancing said second die toward said first die to effect the coining operation.
Dependencies are inferred from the claim text.