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US 4,005,549 AGranted
Abrasive flow machining method and tooling
AssigneeDynetics, Inc.
InventorKenneth E. Perry
Life of this patent
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AssigneeDynetics, Inc.
InventorKenneth E. Perry
Estimating the term…
Method and Tooling for removing material from holes or orifices (round or other shapes) or the like in a workpiece, the method and tooling providing means for directing at least a first portion of an abrasive flow composition under pressure from a main body of composition from one side of a workpiece to another side of the workpiece (i.e. about the workpiece) so as to permit at least a second portion of the abrasive flow composition also under pressure from the same main body of composition to easily flow through the holes therein. In the preferred embodiment a first portion of the composition which is directed about the workpiece is returned to a point adjacent another side of the workpiece and is directed at an angle to the flow of the second portion of the composition through the holes in order to produce an interaction between the flow of said first and second portions of said composition.
In an abrasive flow machine having means for passing an abrasive flow composition in two directions through a hole of a workpiece held by a tool having a first flow passage means in flow alignment with both ends of the hole of said workpiece, the improvement of said tool having a second flow passage means for diverting a portion of said abrasive flow composition away from said first flow passage means prior to it flowing through the hole of the workpiece and redirecting said diverted composition at the abrasive flow composition passing out of the hole of said workpiece and into said first fluid passage means when said composition is being passed through said workpiece in either direction.
In an abrasive flow machine having means for providing an abrasive flow composition for passage through a hole of a workpiece held in the confines of a tool having a central flow passage means in flow alignment with either end of said hole, the improvement of a diversionary flow passage means for diverting a portion of said abrasive flow composition away from said central flow passage means and redirecting said diverted composition into said central flow passage means at a point which is off center from the center of the central flow passage means in order to impart a swirl to the diverted composition.
A method of abrasive flow machining a through hole in a workpiece which comprises supporting said workpiece in a tool, directing the flow of an abrasive flow composition under pressure towards said tool, directing the flow of a first portion of said abrasive flow composition at said hole of said workpiece at one side thereof, directing the flow of a second portion of said abrasive flow composition about said workpiece, and then directing the flow of said second portion of said composition against the flow of the first portion at a position adjacent another side of the workpiece at a point after the flow of said first portion of said composition has passed through said hole.
A method of radiusing at least one small hole in a workpiece, said hole of a width of 20 mils or less which comprises flowing a first abrasive flow composition through the hole from one side of the workpiece and flowing a second abrasive flow composition at the first abrasive flow composition coming out of said hole at a point below the opposite side of said workpiece.
A method of radiusing a large hole without substantially removing surface material between the entrance and exit of the hole which comprises flowing a first abrasive flow composition through said hole and then directing a second abrasive flow composition at said first composition after it has left said hole, the flow of said abrasive composition being greater through the hole than the flow of the second composition directed at said first composition.
Dependencies are inferred from the claim text.