Apparatus for the precision grinding of conical seats for cylindrical nozzle workpieces
AssigneeErnst Thielenhaus KG
InventorManfred Becker
Life of this patent
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Abstract
An apparatus for the precision grinding of conical valve seats of nozzles, for example, injection nozzles for internal combustion engines. The body is entered hydraulically on a mandrel and a driver has a rubber O-ring braced against the nozzle body to frictionally engage it is rotation while passing through the mandrel for the shaft of a grinding tool which is located at the end of the mandrel. The system avoids radial clamping stresses on the workpiece and hence allows, precision low tolerance finish grinding to be achieved.
Claims18
An apparatus for precision grinding of an internal conical sealing surface of a nozzle workpiece adjacent a cylindrical bore coaxial with the sealing surface and having an orifice coaxial with the sealing surface at an apex thereof, said apparatus comprising:
- a machine slide;
- a hydrocentric mandrel mounted on said machine slide and upon which said workpiece is positioned and having an outer surface juxtaposed with a wall of said bore, and outlet openings at said outer surface spaced along a length of said mandrel for forcing a centering liquid between said mandrel and said workpiece, said mandrel having a central passage;
- a driver body movable toward said machine slide and formed with a cylindrical recess receiving said workpiece and provided with means for rotating said body about an axis of said recess;
- an elastic entrainer on said body frictionally engageable with said workpiece upon movement of said driver body toward said machine slide for rotatably entraining said workpiece with said body around said axis;
- a precision grinding tool located beyond an end of said mandrel engaging said internal conical sealing surface;
- a drive shaft connected to said tool and extending through said passage;
- and
- a motor on said slide connected to said shaft for driving said tool.
Dependencies are inferred from the claim text.