Method of preparing a frictional material
AssigneeInoue-Japax Research Incorporated
InventorKiyoshi Inoue
Life of this patent
Estimating the term…
Abstract
An improved method of preparing a frictional material is disclosed wherein a magnetic material is mixed in a preselected proportion with a polymeric or resinous frictional substance, the mixture while in an external magnetic field of a predetermined orientation being formed to yield the frictional material acquiring a frictional anisotropy.
Claims18
A method of preparing a member operating as a machine part with a surface in frictional sliding contact with another part in a machine, the method comprising the steps of:
- (a) mixing uniformly in a preselected proportion magnetic particles with a resinous frictional substance;
- (b) subjecting the mixture resulting from step (a) to an external magnetic field while shaping the mixture to form said member with said surface, said magnetic field being oriented, relative to said mixture being shaped to form said member, in a predetermined directional relationship with said surface of said member and having a magnetic-field strength sufficient for said member to acquire a maximum frictional anisotropy having an extreme value of frictional coefficient in the direction of said surface, by
- (b1) cold-shaping said mixture under pressure in said external magnetic field to form a compacted body of the mixture of predetermined configuration and size, and
- (b2) subsequently heating the body to allow the resinous substance in pulverized form to coalesce and said magnetic particles to be bonded together and to said coalescing resinous particles to yield said frictional material.
A method of preparing a member operating as a machine part with a surface in frictional sliding contact with another part in a machine, the method comprising the steps of:
- (a) mixing uniformly in a preselected proportion magnetic particles with a resinous frictional substance;
- (b) subjecting the mixture resulting from step (a) to an external magnetic field while shaping the mixture to form said member with said surface, said magnetic field being oriented, relative to said mixture being shaped to form said member, in a predetermined directional relationship with said surface of said member and having a magnetic-field strength sufficient for said member to acquire a maximum frictional anisotropy having an extreme value of frictional coefficient in the direction of said surface, by
- (b1') cold-shaping said mixture under pressure to form a compacted body of the mixture of predetermined configuration and size;
- and
- (b2) subsequently heating the body in said magnetic field to allow the resinous substance in pulverized form to coalesce and said magnetic particles to be bonded together and to said coalescing resinous particles in a said predetermined orientation to yield said frictional material.
A method of preparing a member operating as a machine part with a surface in frictional sliding contact with another part in a machine, the method comprising the steps of:
- (a) mixing uniformly in a preselected proportion magnetic particles with a resinous frictional substance;
- (b) subjecting the mixture resulting from step (a) to an external magnetic field while shaping the mixture to form said member with said surface, said magnetic field being oriented, relative to said mixture being shaped to form said member, in a predetermined directional relationship with said surface of said member and having a magnetic-field strength sufficient for said member to acquire a maximum frictional anisotropy having an extreme value of frictional coefficient in the direction of said surface by (b1') cold shaping said mixture under pressure to form a compact body off the mixture of predetermined configuration and size;
- and (b2) subsequently heating the body in said magnetic field to allow the resinous substance in pulverized form to coalesce and said magnetic particles to be bonded together and to said coalescing resinous particles in a said predetermined orientation to yield said frictional material, said magnetic field having a field strength of 1000 to 10,000 Gauss, and being of periodically or aperiodically varying field strength.
Dependencies are inferred from the claim text.