Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Plural – intermittent pressure applying
Patent
1995-09-11
1997-12-16
Simmons, David A.
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Plural, intermittent pressure applying
264294, 264318, 264325, 425353, 425354, 425356, 425DIG58, B29C 4342, B30B 1114
Patent
active
056981490
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
This invention relates to dies and particularly split dies for producing compacted parts out of powder material having an undercut, and more specifically relates to a device to compact parts out of powder material which includes a pair of dies linearly moveable relative to one another and then phased, and an associated linearly displaceable pair of punches for producing parts which are phased or have an undercut.
BACKGROUND OF THE INVENTION
Devices to compact parts out of powder material for sintering are well known to those persons skilled in the art. In some cases, the compacted part has an undercut which prevents removal of the part or blank from the dies by linear or axial displacement.
Tool sets with split dies are known in powder material compaction to press parts into shapes that have an undercut in the compacting direction.
For example, U.S. Pat. No. 3,773,446 teaches a device for moulding parts to be sintered by compressing powdered material held between a fixed die and moveable die. A pair of punches extending through the dies compresses the powder material. A pressure plate operated by the punch extending through the moveable die engages the moveable die and is also locked to the fixed die during the compression to produce a part having an undercut.
U.S. Pat. No. 3,752,622 teaches a device for moulding blanks with undercut parts to be sintered by compaction of powder material.
The prior art teaches that both parts of the die are tied together while a feed box moves across the top of the dies for filling the cavity with powdered material. After compaction the upper part of the die moves away together with the top punch to eject the part.
One of the disadvantages of the known systems as referred to above relates to the fact that the upper part of the die has to be tied mechanically to the lower part of the die and the upper punch in an alternating mode, thus making a complicated tool rig necessary.
Moreover, gearsets and camsets, for example, are characterized by two levels of the same shape but phased to each other to comprise an undercut in the compacting direction. Such parts may be manufactured in by known methods as referred to above with the disadvantages noted therein.
Another disadvantage of the prior art is that the undercut can only be indirectly filled thereby creating a section of lower density in the compacted part.
It is therefore an object of this invention to provide a device that is simpler to construct and more efficient to operate than heretofore known by the prior art.
It is another object of this invention to provide a tool system with a split die where both parts of the die remain tied to one part of the rig during the entire cycle.
It is a further object of this invention to provide a device and method to produce compact phased parts such as gears, cams and the like with less complicated tooling and more efficient fill of the undercut than presently available.
In a first aspect of the invention there is provided a tool set for a powder molding machine having a pair of die sets each having a die and a punch moveable relative thereto to define respective chambers, the die sets co-operable to place the chambers in communication and thereby to define a mold cavity, the punches being movable relative to one another in a direction parallel to a common axis to reduce the volume of the mold cavity and to compress powder therein, the dies being movable relative to one another in a plane normal to the common axis, independently of movement along the common axis, to displace the chambers relative to one another and to define a phased component in the mold cavity, and the dies being separable in the direction of the common axis to permit a molded component to be removed therefrom.
In one aspect of the invention the dies are movable in linear translation, one relative to the other, in the plane normal to said common axis. In another aspect of the invention the dies are movable in rotation, one relative to the other, in said plane normal to the common axis.
In anoth
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"Sintered Helical Gears in One Operation" -Date, Author and Publication unknown.
SAE Technical Paper Series 960278, Nagata and Sugimoto, Feb. 26 -29, 1996 "The Development of P/M Complicated Shape Helical Gears".
Buckley-Golder Keith
Haiko Mark
Hinzmann Gerd
Ma Frank
Round Robert
Jones Kenneth M.
Orange John R.S.
Simmons David A.
Stackpole Limited
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