US 6,527,620 B1Granted

Honing tool used to finish blind bores in workpieces and the method of using such tool

AssigneeSunnen Products Company

InventorsRichard F. Moellenberg, Jr., John J. Schimweg, David M. Moehn

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Abstract

A device for honing blind bores in parts, a blind bore including a cylindrical bore open at one end and closed adjacent to the opposite end including a honing mandrel for mounting on a honing machine that produces rotation thereof, the mandrel having a cylindrical honing portion adjacent one end which portion and the adjacent portion of the mandrel have spaced axially extending slot therethrough to enable the honing portion of the mandrel to expand and contract in size, the honing portion having a portion adjacent to the end thereof which is somewhat larger than the rest of the honing portion when the honing portion is expanded for honing in the blind hole, the end portions of the mandrel between the spaced slots being elastically expandable from a retracted position which is less than the diameter of the surface to be honed to enable insertion therein to a more expanded condition wherein the diameter of the honing portion at the largest point is the diameter at which the mandrel will hone the blind hole. The present invention also includes a method for programming the operation of the device to produce the desired honing operations when honing blind holes.

Claims10

Dependent claims

A honing tool for use in honing the cylindrical surface of a bore that is open at one end and closed adjacent the opposite end comprising:

an elongated tubular member having a portion at one end thereof that has an abrasive outer surface and a conically tapered inner surface, the abrasive outer surface extending to an endmost free end portion of the tubular member;
means adjacent an end of the tubular member opposite the one end for attaching the tubular member to a honing machine;
at least one slot extending completely through and beyond the one end of the tubular member in a direction toward the opposite end thereof, the conically tapered inner surface having an unstressed diameter at the free end portion of the one end which is less than the unstressed diameter thereof adjacent the opposite end of the abrasive outer surface, and
an elongated expander member extending through the tubular member including a conically tapered end portion terminating within the tubular member and engageable in surface to surface contact with the conically tapered inner surface of the tubular member whereby axial movement of the expander member in one direction will move the conically tapered end portion within the tubular member to engage the conically tapered inner surface to expand the slotted end of the tubular member to increase the honing diameter of said expanded end and axial movement in the opposite direction causes the end to retract in diameter, such that the tubular member with the expander member therein can be positioned in the bore with the free end portion at or closely near the closed end thereof and the tubular member expanded to engage the abrasive outer surface with the cylindrical surface of the bore at or closely near the closed end.

1 more element

A device for honing blind bores in workpieces, a blind bore including a cylindrical surface defining a bore open at one end and closed near the opposite end, a tubular mandrel for mounting on a honing machine that produces rotation thereof, the mandrel having inner and outer surfaces and including an expandable work engaging portion adjacent one end, said expandable work engaging portion having at least one slot extending therethrough and beyond the work engaging portion in a direction away from an endmost free end thereof and toward an opposite end for mounting on the honing machine, an abrasive material on the outer surface of the expandable work engaging portion of the mandrel extending to the endmost free end of the mandrel, said expandable work engaging portion having a substantially conical inner surface, an elongated wedge member having a conical outer surface positioned in the mandrel and extending through the expandable portion thereof for movement in surface-to-surface contact with the substantially conical inner surface of the tubular mandrel, the wedge member being axially moveable through the mandrel in a first direction to expand the diameter of the work engaging portion so as to have an outer tapered conical shape which has a largest diameter portion located closely adjacent to the endmost free end of the mandrel in position for honing the cylindrical surface at or closely adjacent to the closed end of the bore and the wedge member being moveable in the opposite direction to allow the work engaging portion to retract so that it can move through the blind bore without contacting the cylindrical surface defining the bore.

Dependencies are inferred from the claim text.