Method and apparatus for machining valve seats and valve stem guides in a deep-walled engine monoblock workpiece
US4872789A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 3, 1989 |
| Grant date | Oct 10, 1989 |
| Priority date | — |
| Expiry date | Apr 3, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/5587
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Valve seats are machined at the end of an axially deep, narrow cavity of a workpiece having an axially clampable surface within the cavity adjacent one or more valve seats. The method comprehends: (a) supporting a rotary driven spindle assembly of sufficient length to extend through the axial extent of the cavity and reach the valve seat, the spindle carrying a cutting tool at its extremity, the support being in a nonrotatable housing effective to fit closely to the interior of the cavity (within a tolerance of 0.01 inches) and effective to move along the axis of the cavity to bring the cutting tool into machining contact with the valve seats; (b) securing a radially rigid but axially resilient diaphragm to the end of the housing, the diaphram extending transversely across the interior of the cavity; (c) afer inserting the housing and spindle into the cavity so that the cutting tool is proximate the valve seat but out of contact therewith, axially clamping a portion, of the diaphragm remote from the spindle, against the axially clampable surface; and (d) moving the rotary driven spindle assembly axially toward the valve seat to conduct machining contact of the cutting tool therewit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.