Claims
- 1. A high speed rotary cutting apparatus for cutting elastomeric material, said apparatus comprising:
- a housing having a first end and a second end and a housing bore between said first end and said second end;
- a spindle mounted for rotation within said housing bore; and,
- a rotary blade fixedly mounted to a first end of said spindle, said spindle and rotatary blade being rotatable at speeds greater than 2000 rpm, said rotary blade having a generally planar cutting surface in a cutting surface plane, a generally planar back surface in a back surface plane, said back surface plane being disposed at an angle .alpha. with said cutting surface plane of between 10 degrees and 90 degrees, said rotary blade further including a plurality of peripheral lobes, each of the lobes having an attack surface and a trailing surface separated by a peak, said attack surface and said trailing surface being non-symmetric about a radial line passing through said peak wherein the trailing surface is inclined more sharply than the attack surface.
- 2. The high speed rotary cutting apparatus of claim 1 wherein said attack surface is disposed at an attack angle AA to a plane perpendicular to said radial line, said attack angle AA being between 0 degrees and 20 degrees and said trailing surface is disposed at a trailing angle TS to said attack surface, said trailing angle TS being about 110 degrees.
- 3. The high speed rotary cutting apparatus of claim 1 wherein said rotary blade is coated with a non-stick plasma coating.
- 4. The high speed rotary cutting apparatus of claim 3 wherein said non-stick plasma coating is B.sub.4 N.
- 5. The high speed rotary cutting apparatus of claim 1 wherein said spindle has an axial spindle bore and wherein the cutting apparatus further comprises a cooling nozzle mounted adjacent said spindle for propelling air into said spindle bore.
- 6. The high speed rotary cutting apparatus of claim 1 further comprising:
- a first seal located near said first end of said spindle and sealing said spindle from said housing.
- 7. The high speed rotary cutting apparatus of claim 1 further comprising:
- a bearing disposed between said spindle and said housing, said bearing being a preloaded, angular contact ball bearings.
- 8. The high speed rotary cutting apparatus of claim 1 further comprising:
- a shoe having a top surface located in a first plane;
- a shoe insert having a top surface in said first plane of said top surface of said shoe, said shoe insert being mounted on said shoe and having a groove adjacent to a cutting surface; and,
- replacement means for replacing said shoe insert mounted on said housing in sliding relationship to said rotary blade.
- 9. The high speed rotary cutting apparatus of claim 8 wherein said replacement means comprises:
- a frame connected to said shoe at a first end, said frame including a dovetail slide at a second end of said frame and operably connected to said housing.
- 10. The high speed rotary cutting apparatus of claim 9 wherein said replacement means further comprises:
- a gib lock for releasably holding said dovetail slide in a predetermined position relative to said housing.
- 11. The high speed rotary cutting apparatus of claim 8 wherein said shoe insert has a second cutting edge adjacent to said groove.
- 12. The high speed rotary cutting apparatus of claim 8 wherein said shoe insert is coated with titanium nitride.
- 13. A high speed rotary cutting apparatus for cutting elastomeric material, said apparatus comprising:
- a housing having a first end and a second end and a housing bore between said first end and said second end;
- a spindle mounted for rotation within said housing bore; and,
- a rotary blade fixedly mounted to a first end of said spindle, said spindle and rotatary blade being rotatable at speeds greater than 2000 rpm, said rotary blade having a generally planar cutting surface in a cutting surface plane, a generally planar back surface in a back surface plane, said back surface plane being disposed at an angle .alpha. with said cutting surface plane of between 10 degrees and 90 degrees;
- a shoe having a top surface being located in a first plane;
- a shoe insert having a top surface in said first plane of said top surface of said shoe, said shoe insert being mounted on said shoe and having a groove adjacent to a cutting surface; and,
- replacement means for replacing said shoe insert mounted on said housing in sliding relationship to said rotary blade;
- wherein said shoe insert has a cross-sectional shape which resembles an "I-beam".
- 14. The high speed rotary cutting apparatus of claim 1 wherein said rotary blade comprises between 4 and 40 of said peripheral lobes.
- 15. The high speed rotary cutting apparatus of claim 1 further comprising:
- a shoe having a top surface being located in a first plane;
- a shoe insert mounted on said shoe, said shoe insert having a top surface generally coplanar with said top surface of said shoe, said shoe insert having a cutting edge parallel to said cutting surface of said rotary blade and closely spaced thereto.
Parent Case Info
This application is a division of application Ser. No. 08/298,851, filed Aug. 31, 1994, now abandoned.
US Referenced Citations (20)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0084347 |
Jul 1983 |
EPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
298851 |
Aug 1994 |
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