Extrude Hone Corporation

Other

Lawrence J Rhoades

James Randall Gilmore

Nicholas P Nokovich

Ralph L Resnick

Thomas A Kohut

Donald G Risko

John R Rose

William D Jenkins

John M Matechen

John M Greenslet

Mark J Rosner

Frank E Johnson

Michael L Rhoades

Danny W Yanda

David D Pertle

An abrasive flow apparatus for polishing a workpiece wherein a horizontal machine tool is adapted such that a workpiece may be secured to first shaft rotatable about a first longitudinal axis. A conjugate form to the workpiece may be secured to a second shaft which is rotatable about a second longitudinal axis. The workpiece and conjugate form are secured to each shaft in a manner such that they are facing one another and slightly set apart to define a gap. A flowable abrasive media is introduced within this gap. The centerlines of the workpiece and the conjugate form are offset from one another such that rotation of the shafts in the same direction and at the same rotational speed produces relative motion between the workpiece and the conjugate form thereby polishing the workpiece. A slide may be used for axially positioning the first shaft and the second shaft a predetermined distance to define the size of the gap. A feeder may be used for introducing flowable abrasive media within a work zone defined by the volume of the gap between the workpiece and the conjugal form.

Orbital polishing apparatus and method

A method and apparatus are disclosed for abrading the inner surface at the intersection region of a branch outlet with the wall of a body having a passageway. Using abrasive flow machining, it is possible to abrade the intersection region to provide a smooth transition between the wall and the branch outlet.

Apparatus for abrading the region of intersection between a branch outlet and a passageway in a body

Method and apparatus for abrading the region of intersection between a branch outlet and a passageway in a body

A method and apparatus for comparing the flow rate through an orifice within a master part with the orifice within a workpiece by subjecting each orifice to an identical fluid at an identical temperature, under an identical pressure, and comparing the downstream pressures of the fluid exiting these orifices when the upstream pressure is constant or comparing the upstream pressure when the downstream pressure is constant. For purely measurement purposes, the fluid may be a non-abrasive media, however, in the event the workpiece orifice must be machined, it is possible to introduce a flowable abrasive media, and pass this media through the orifices until the desired pressure difference is achieved. With additional flow characteristics of the master part, it is also possible to calculate the flow rate through the workpiece orifice using only the pressure differential at the exits of the workpiece and the master part.

Method and apparatus for measuring flow rate through and polishing a workpiece orifice

The present invention is based on the practice of abrasive machining with no sealed working chamber by the employment of a visco-elastic abrasive medium, behaving predominantly as an elastic solid at the applied strain of the orbital working motion, and applying orbital or other relative working motion to produce strain rates which bring the medium into a predominantly elastic deformation and often near, but not to exceed, the compressive stress limit at the strain rate employed. The preferred visco-elastic abrasive medium is a rheopectic poly(boro-siloxane) filled with viscosity increasing stiffening agents and high loadings of the abrasive of choice and relatively mono amounts of plasticizers. The system is operated in an open chamber under applied strain rates such that at least 50%, particularly about 50 to 99%, and preferably about 80 to 95%, of the deflection of the medium under the conditions of operation occurs by elastic deformation and is elastically recovered, and less than 50% particularly about 1 to 50%, preferably about 5 to 20%, of the deflection of the medium occurs by fluid or plastic flow.

Abrasive polishing composition

The present invention relates to an energy absorbent medium which is compliant and conformable in the absence of an applied force, and stiffens in response to the rate of an applied force to dissipate energy. The medium comprises a blend of a polymer and a lubricant incompatible with the polymer to produce a conformable absorbent which exhibits dilatant (shear thickening) characteristics under high rates of force or stress. The polymer has reformable sacrificial chemical bonds which are broken under a high rate of deformation and which reform under static conditions. Suitable polymers for the invention include polyborosiloxanes. Applications for the medium include absorbent for sports padding, athletic equipment, motor vehicle seats, bulletproof vests, medical equipment, industrial equipment, weaponry, and playing fields.

Smart padding system utilizing an energy absorbent medium and articles made therefrom

A method for producing, from a blank, restrictive tooling for use in an orbital polishing machine involves urging one of either the workpiece or the blank along a predetermined path against the other to physically impart a proportioned contour of the workpiece into the blank, thereby producing the restrictive tooling. Using this method, the same orbital polishing machine may be used to produce the restrictive tooling and to subsequently polish the workpiece.

Self-forming tooling for an orbital polishing machine and method for producing the same

Abrasive polishing apparatus

Abrasive jet stream polishing, wherein an abrasive is suspended in a flowable jet medium and projected at high velocity and pressure at a workpiece is provide, where the jet is projected at the surface to be polished at an oblique angle. The method is substantially improved by forming the medium of a polymer having reformable sacrificial chemical bonds which are preferentially broken under high shear conditions. Projecting the medium and suspended abrasive breaks the reformable sacrificial chemical bonds while polishing. The chemical bonds will reform, permitting recycling of the medium and abrasive for reuse in the method. The jet is effective at relatively low pressures of about 5 to about 80 MPa.

Abrasive jet stream polishing

The present invention is based on the practice of abrasive machining with no sealed working chamber by the employment of a visco-elastic abrasive medium, behaving predominantly as an elastic solid at the applied strain of the orbital working motion, and applying orbital or other relative working motion to produce strain rates which bring the medium into a predominantly elastic deformation and often near, but not to exceed, the compressive stress limit at the strain rate employed. The preferred visco-elastic abrasive medium is a rheopectic poly(boro-siloxane) filled with viscosity increasing stiffening agents and high loadings of the abrasive of choice and relatively minor amounts of plasticizers. The system is operated in an open chamber under applied strain rates such that at least about 50%, particularly about 50 to 99%, and preferably about 80 to 95%, of the deflection of the medium tinder the conditions of operation occurs by elastic deformation and is elastically recovered, and less than 50%, particularly about 1 to 50%, preferably about 5 to 20%, of the deflection of the medium occurs by fluid or plastic flow.

Abrasive polishing method, apparatus and composition

Investment casting molds, and particularly mold cores, are formed of sintered ceramics to near net shape and are then machined to net shape, dimensions and surface finish, by ultrasonic machining with formed tools having the final configuration in mirror image form. Form machining of fired mold shells and cores is rapid, precise, readily controlled, and can produce castings of exceptional accuracy of shape, dimensions and surface finish.

Investment casting molds and cores

Abrasive jet stream cutting, wherein an abrasive is suspended in a flowable jet medium (64) and projected at high velocity and pressure (75) at a workpiece (76) is substantially improved by forming the medium of a polymer having reformable sacrificial chemical bonds which are preferentially broken under high shear conditions. Projecting the medium and suspended abrasive breaks the reformable sacrificial chemical bonds while cutting. The chemical bonds will reform, permitting recycling of the medium and abrasive for reuse in the method. The jet is effective at pressures of about 14 to 80 MPa.

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Pittsburgh, PA, United States of America

Lawrence J Rhoades