Method and apparatus for truing and trued grinding tool

Claim 2

A grinding tool truing method, comprising: a step of truing a grinding surface of a grinding tool which has many abrasive grains secured with bond, said abrasive grains being embedded in said bond; a step of uniformly dressing the bond surface of the trued grinding surface for projecting the embedded abrasive grains on said grinding surface from said bond surface by a predetermined height; and a step of lapping cutting edges of said abrasive grains projected from said bond surface, to be lapped on a target surface to which an object is to be ground, by use of a lapping surface of a truing tool, said lapping surface including a material chemically reactive with said abrasive grains for lapping.

Claim 3

A grinding tool truing method, comprising: a step of truing a circular grinding surface of a disk-shaped diamond tool which has many diamond abrasive grains secured with bond, said diamond abrasive grains being embedded in said bond; a step of uniformly dressing the trued circular grinding surface for projecting the embedded abrasive grains from the bond surface by a predetermined height; and a step of lapping cutting edges of said abrasive grains projected from said bond surface, to be lapped on a target surface to which an object is to be ground, by use of a lapping surface of a truing tool, said lapping surface including an iron family element.

Claim 4

A grinding tool truing method, comprising: a step of truing a circular grinding surface of a disk-shaped diamond tool which has many diamond abrasive grains secured with bond, said diamond abrasive grains being embedded in said bond; a step of uniformly dressing the trued circular grinding surface for projecting the embedded abrasive grains from the bond surface by a predetermined height; and a step of lapping cutting edges of said abrasive grains projected from said bond surface, to be lapped on a target surface to which an object is to be ground, by use of a lapping surface of a truing tool, said lapping surface including an iron family element.

Claim 5

A diamond grinding tool truing method, comprising: a step of grinding a grinding surface of a cup-shaped diamond tool which has many diamond abrasive grains secured with bond to a flat surface by a first truing tool whose surface comprises another diamond tool; a step of uniformly dressing said flat surface for projecting said abrasive grains from said flat surface by a predetermined height from the bond surface of said flat surface; and a step of lapping cutting edges of said abrasive grains projected from said bond surface, to be lapped on a target surface to which an object is to be ground, by use of a lapping surface of a second truing tool, said lapping surface including an iron family element.

Claim 6

A diamond grinding tool truing method, comprising: a step of grinding a grinding surface of a cup-shaped diamond tool which has many diamond abrasive grains secured with bond to a flat surface by a first truing tool whose surface comprises another diamond tool; a step of uniformly dressing said flat surface for projecting said abrasive grains from said flat surface by a predetermined height from the bond surface of said flat surface; and a step of lapping cutting edges of said abrasive grains projected from said bond surface, to be lapped on a target surface to which an object is to be ground, by use of a lapping surface of a second truing tool, said lapping surface including an iron family element.

Claim 7

A truing method according to claim 2, wherein said bond is a metal bond and said step of uniformly dressing includes arranging a dressing surface of an electrode which is in parallel with the grinding surface of said grinding tool to be opposed to said grinding surface at a predetermined interval, connecting a cathode of a power source to said electrode and an anode thereof to said tool for supplying an electric current therebetween for electrochemically dressing the bond surface.

Claim 8

A truing method according to claim 2, wherein said abrasive grains are diamond abrasive grains and the chemically reactive material is an iron family metal.

Claim 9

A truing method according to claim 5, wherein the grinding surface of said grinding tool is a circular grinding surface, and said step of uniformly dressing further comprises rotating said grinding tool supplying said electric current.

Claim 10

A truing method according to claim 6, wherein the grinding surface of said grinding tool is a circular grinding surface and said step of lapping further comprises lapping said cutting edges which are in contact with said lapping surface.

Claim 11

A diamond grinding tool truing apparatus, comprising: a spindle for supporting a circular diamond grinding tool having many diamond abrasive grains on its grinding surface and secured by bond, said spindle being supported by a bearing with static pressure; a rotation drive source for said spindle; a first truing tool having a truing surface for truing a grinding surface of said diamond grinding tool; a rotation drive source for said first truing tool; means for relatively feeding said truing surface of said truing tool and said grinding surface of said diamond grinding tool in contact therewith; a dressing apparatus for uniformly removing bond on said grinding surface of said diamond grinding tool, to project said diamond abrasive grains by a predetermined height; a second truing tool having a lapping surface for lapping tips of the projected diamond abrasive grains for aligning cutting edges of said diamond abrasive grains, said lapping surface comprising a material that is chemically abrasive with said abrasive grains for lapping; a rotation drive source for driving said second driving tool; and means for relatively feeding said lapping surface of said second truing tool and said grinding surface of said diamond grinding tool to be in contact.

Claim 12

A diamond grinding tool truing apparatus, comprising: a spindle for supporting a circular diamond grinding tool having many diamond abrasive grains on its grinding surface and secured by bond, said spindle being supported by a bearing with static pressure; a rotation drive source for said spindle; a first truing tool having a truing surface for truing a grinding surface of said diamond grinding tool; a rotation drive source for said first truing tool; means for relatively feeding said truing surface of said truing tool and said grinding surface of said diamond grinding tool in contact therewith; a dressing apparatus for uniformly removing bond on said grinding surface of said diamond grinding tool, to project said diamond abrasive grains by a predetermined height; a second truing tool having a lapping surface for lapping tips of the projected diamond abrasive grains for aligning cutting edges of said diamond abrasive grains, said lapping surface comprising a material that is chemically abrasive with said abrasive grains for lapping; a rotation drive source for driving said second driving tool; and means for relatively feeding said lapping surface of said second truing tool and said grinding surface of said diamond grinding tool to be in contact.

Claim 13

A diamond grinding tool truing apparatus according to claim 8, wherein said first truing tool and said second truing tool are constructed and can be installed as a single truing apparatus allowing for selection between said first and second truing tools.

Claim 14

A truing apparatus according to claim 9, wherein the position of said spindle for supporting the diamond grinding tool as a workpiece is fixed, and said first truing tool, said dressing apparatus, and said second truing tool can be moved to the processing position and the escaping position of said workpiece.

Claim 15

A truing apparatus according to claim 9, wherein a cup-shaped metal bond diamond tool is used as the first truing tool.

Claim 16

A truing apparatus according to claim 9, wherein a cup-shaped truing tool having a lapping surface made of an iron family metal is used as said second truing tool.

Claim 17

A truing apparatus according to claim 9, wherein said dressing apparatus is for arranging a dressing surface of an electrode which is in parallel with the grinding surface of said diamond grinding tool to be opposed to said grinding surface at a predetermined interval, connecting a cathode of a power source to said electrode and an anode thereof to said tool for supplying an electric current therebetween for electrochemically dressing the bond surface.

Claim 18

A grinding tool truing method comprising: a step of lapping cutting edges of abrasive grains on the surface of said grinding tool, to be lapped on a target surface to which an object is to be ground by said grinding tool, by use of a lapping surface of a truing tool, said lapping surface including a material chemically reactive with said abrasive grains for lapping.

Claim 19

A grinding tool truing method comprising: a step of lapping cutting edges of abrasive grains on the surface of said grinding tool, to be lapped on a target surface to which an object is to be ground by said grinding tool, by use of a lapping surface of a truing tool, said lapping surface including a material chemically reactive with said abrasive grains for lapping.

Claim 20

A grinding tool truing method according to claim 2, wherein the chemically reactive material of said lapping surface of said truing tool is a material which absorbs elements of said abrasive grains.

Claim 21

A grinding tool truing method according to claim 3, wherein said elements of said abrasive grains are diamond elements, and said chemically reactive material is an iron family element.