Abstract Tool holder for use with machine tools, the tool holder having two aligned cylindrical bores of different diameters, separated by a circumferential groove, which is in communication with a hole through the body of the tool holder through which hydraulic fluid can be supplied. The cylindrical shank of the tool has correspondingly two cylindrical surfaces of different diameters with conical shoulders, one of which is in the end of the shank, while the other connects the cylindrical surfaces. The relaxed diameters of both stepped holes in the tool holder are smaller than the diameters of both cylindrical surfaces of the cylindrical shaft of the tool, the tool shank being press fitted into the tool holder. The advantages of the sectional tool unit according to the present invention are that the need of fastening elements is eliminated, while the mounting surfaces of the tool shank and the tool holder are very effectively engaged and can be machined with a high precision which determines the precision of the tool unit as a whole. The invention also relates to the methods of assembly and disassembly of the tool and tool holder.
A sectional tool unit for machine tools, said unit comprising a tool with a shank which is a body of revolution, and a tool holder having a passage therein which matingly receives said shank with an interference fit, the passage in the tool holder being formed of two aligned cylindrical bores of different diameters separated by a circumferential groove, the groove and the two cylindrical bores in the tool holder being connected to the exterior of the tool holder body by a passage extending through said body, the shank of the tool having an external surface formed of two aligned cylindrical surfaces of different diameters and two frustoconical surfaces one of which is disposed at the outer end of the tool shank, while the other connects the two circular cylindrical surfaces of the shank, the relaxed diameters of the tool bores in the tool holder being slightly smaller than the diameters of the respective cylindrical surfaces on the shank of the tool, the shank of the tool being press fitted into the passage in the tool holder.
Claim 2
Dependent Claim
177 words
A sectional tool unit for machine tools, said unit comprising a tool with a shank which is a body of revolution, and a tool holder having a passage therein which matingly receives said shank with an interference fit, the passage in the tool holder being formed of two aligned cylindrical bores of different diameters separated by a circumferential groove, the groove and the two cylindrical bores in the tool holder being connected to the exterior of the tool holder body by a passage extending through said body, the shank of the tool having an external surface formed of two aligned cylindrical surfaces of different diameters and two frustoconical surfaces one of which is disposed at the outer end of the tool shank, while the other connects the two circular cylindrical surfaces of the shank, the relaxed diameters of the tool bores in the tool holder being slightly smaller than the diameters of the respective cylindrical surfaces on the shank of the tool, the shank of the tool being press fitted into the passage in the tool holder.
Claim 3
Dependent Claim
37 words
A sectional tool unit according to claim 1, wherein the diameter of the cylindrical surface adjacent to the outer end of the tool shank is less than the diameter of the other cylindrical surfaces on such shank.
Claim 4
Dependent Claim
51 words
A sectional tool unit according to claim 1, comprising an annular groove in the outer end of the tool shank, and a second annular groove in the outer end of the tool shank receiving passage in the tool holder, and a resilient sealing ring mounted in each of said annular grooves.