US3766998A - Disc cutter for boring-type mining machine - Google Patents
Disc cutter for boring-type mining machine Download PDFInfo
- Publication number
- US3766998A US3766998A US00272409A US3766998DA US3766998A US 3766998 A US3766998 A US 3766998A US 00272409 A US00272409 A US 00272409A US 3766998D A US3766998D A US 3766998DA US 3766998 A US3766998 A US 3766998A
- Authority
- US
- United States
- Prior art keywords
- ring
- cutter
- shaft
- earth
- tapered
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
- E21D9/1006—Making by using boring or cutting machines with rotary cutting tools
- E21D9/104—Cutting tool fixtures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/08—Roller bits
- E21B10/12—Roller bits with discs cutters
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/50—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type
- E21B10/52—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type with chisel- or button-type inserts
Definitions
- a cutter tool for an earth-boring machine comprises a disc or ring of a metal or alloy having a Rockwell C hardness of at least 60 and having a circumferential cutting edge on its outside surface.
- the inner surface of the ring, or of a steel liner on which the hard metal ring is mounted, has a tapered cross-sectional configuration.
- a first annular support engages one of the inner tapered surfaces and a second annular support the other tapered surface. These annular supports may be drawn toward each other to exert a hoop stress on the hard metal ring thereby placing it in a prestressed condition.
- the hard metal ring, its optional steel liner and the supports constitute an assembly which is rotatably mounted on a shaft.
- the shaft includes means for attachment to an earth-boring machine with the shaft in axial alignment with a radius of the bore.
- Each cutter has a circumferential cutting edge which is composed of very hard metal.
- Contact betweenthe circumferential cutting edge of the cutter and the earth or rock against which it impinges results in fracturing and dropping of such earth or rock to the floor of the bore where it is gathered up and dumped on to a belt which carries it to the rear of the advancing machine.
- the cutters and the bearings on which they are mounted are subjected to very great stress. This is particularly true when the machine is attacking a very hard rock structure. When this occurs the cutters are placed under severe strain and their life is apt to be quite short. In some formations the circumferential cutting surface will fail in less than 100 feet of boring.
- the present invention has as its object to provide a more efficient and longer lasting cutter tool. This is accomplished by prestressing the circumferential cutting edge of the cutter tool in order to make it better able to withstand the very severe compressive shocks applied to the tool during operation of the boring machine.
- the prestressing is accomplished by providing the inner surface of the ring with a tapered cross-sectional configuration.
- a first annular support member engages one of the tapered inner-surfaces and a second annular support member engages the other tapered surface.
- These annular support members may be drawn toward each other to exert a hoop stress on the cutting ring, thereby placing it in a prestressed condition.
- prestressed the cutter ring is capable of withstanding greater compressive forces as hard rock surfaces are encountered than is the case if the cutter ring is not prestressed.
- FIG. 1 is a view, partly in section, of a cutter tool constructed in accordance with this invention.
- FIG. 2 is an alternative embodiment shown in cross section of the cutter ring portion of FIG. 1.
- the cutter tool of this invention consists of a shaft on which is mounted a pair of sleeves l l and end plates 12.
- the sleeves l1 and end plates 12 are removably but not rotatably mounted on the shaft 10. While the sleeves l1 and end plates 12 are illustrated with a circular configuration they can have other configurations which will enable them to be readily and firmly mounted upon the rotary head of a tunnel-boring machine.
- a pair of bearings 13 and 13a are mounted upon the shaft 10. These may be roller bearings. They bear the brunt of the forces applied to the cutting tool during operation and must be both rugged and well lubricated.
- Mounted upon the bearing 13 is an annular support member 14.
- a similar annular support member 14a is mounted upon the bearing 13a.
- the support members 14 and 14a are spaced a short distance from each other and are axially movable along the shaft 10.
- the support members 14 and 14a are connected to each other by means of a number of bolts 15 which are spaced around a circumference. Each bolt 15 threadably engages one of the members 14 and 14a. Where the member 14 is threaded for engagement with a bolt 15 the member 14a is threaded for the bolts immediately adjacent thereto.
- the support member 14 has an annular inclined surface 16 and the support member 14a a mirror-image annular inclined surface 16a. Thus, when the bolts 15 are tightened the surfaces 16 and 16a are drawn toward each other to exert pressure against a cutting ring or disc 20.
- the ring 20 is the portion of the cutter tool which engages the earth or rock which it is desired to remove. It is applied with great force and must be composed particularly along its leading edge of a material which has a Rockwell C hardness of at least 60. Alloy steels are satisfactory for this purpose. Preferred materials are cemented carbides such as cobalt-cemented tungsten carbide or titanium carbide.
- the ring 20 may be composed of a single alloy or, as shown in FIG. 2, may consist of several closely engaging members. The device will first be described to cover the embodiment of FIG. 1 wherethe ring 20 is a single solid member.
- the ring 20 has roughly the configuration formed by two triangles placed base-to-base. On the outer side of the ring this provides a cutting edge 20a and slopedadvancing surfaces 20b and 20c. On the inner side the ring 20 has surface 20d in engagement with surface 16 of support member 14 and surface 20a in engagement with surface of support member Tightening of bolts 15 draws the support members 14 and 14:: toward each other with the result that the surfaces 16 and 16a apply hoop stresses to the ring 20.
- the ring 20 is thus placed under hoop tension which enables it to better withstand the tremendous compressive forces applied to it during operation of the tunnelboring machine. Extremely hard materials are customarily rather weak in tension so care must be exercised are axially movable by means of .a plurality of set screws 18 in order to hold clearances to a minimum.
- the ring 20 derives certain advantages from having the composite construction illustrated in FIG. 2.
- an outer ring 20f is composed of a hard material such as tungsten carbide while the inner rings 20g and 20h are composed of a less hard material such as mild steel.
- the interior sides of the ring 20f have a cross-sectional tapered configuration to provide a side 20] corresponding to the side 20d and a side 20k corresponding to the side 20c.
- a slight gap is left between the portions 20g and 20h.
- the portion 20f is placed under tension. Since this is the portion of the ring which is subjected to greatest compressive force during operation of the machine, the prestressed condition is applied where it will confer the greatest benefit.
- a cutter tool for an earth-boring machine comprismg a cutter ring, said ring having a circumferential cutting edge on its outer surface composed of a metal having a Rockwell C hardness of at least 60 and an inner surface of tapered cross-sectional configuration;
- a cutter tool for an earth-boring machine comprising a shaft
- said assembly consisting of a cutter ring composed of a metal having a Rockwell C hardness of at least 60 and a circumferential cutting edge on its outer surface, an inner surface of tapered cross-sectional configuration, and a pair of annular support members movable toward and away from each other, each support member having a surface in contact with a different one of said tapered inner surfaces whereby movement of said support members toward each other applies hoop stresses to said cutter ring.
Abstract
Description
Claims (6)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US27240972A | 1972-07-17 | 1972-07-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3766998A true US3766998A (en) | 1973-10-23 |
Family
ID=23039676
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00272409A Expired - Lifetime US3766998A (en) | 1972-07-17 | 1972-07-17 | Disc cutter for boring-type mining machine |
Country Status (1)
Country | Link |
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US (1) | US3766998A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2593548A1 (en) * | 1986-01-28 | 1987-07-31 | Boart Int Ltd | CUT DISC FOR ROCK WORKING MACHINE |
US5234064A (en) * | 1992-03-09 | 1993-08-10 | The Robbins Company | Roller cutter assembly having adjustable ring cutter spacing |
EP0602753A1 (en) * | 1992-12-17 | 1994-06-22 | CBK TRADING S.r.l. | Cutting disk for rock and similar materials |
US5626201A (en) * | 1993-09-20 | 1997-05-06 | Excavation Engineering Associates, Inc. | Disc cutter and method of replacing disc cutters |
US5904211A (en) * | 1993-09-20 | 1999-05-18 | Excavation Engineering Associates, Inc. | Disc cutter and excavation equipment |
US20060144200A1 (en) * | 2003-01-10 | 2006-07-06 | Sandra Duden | Cutting ring for disk rolls pertaining to partial and/or full cutting machines |
US20090079256A1 (en) * | 2007-09-25 | 2009-03-26 | Caterpillar Inc. | Rotary cutter for tunnel boring machine |
US10018042B2 (en) * | 2015-10-30 | 2018-07-10 | The Robbins Company | Clamped-ring cutter assembly for tunnel boring machine |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3216513A (en) * | 1964-01-06 | 1965-11-09 | Robbins & Assoc James S | Cutter assemblies for rock drilling |
US3612196A (en) * | 1970-05-01 | 1971-10-12 | Smith International | Rock-boring cutter |
US3679009A (en) * | 1971-02-02 | 1972-07-25 | Kennametal Inc | Rotary cutter for excavation, especially for use with raise boring and tunnel boring machines |
-
1972
- 1972-07-17 US US00272409A patent/US3766998A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3216513A (en) * | 1964-01-06 | 1965-11-09 | Robbins & Assoc James S | Cutter assemblies for rock drilling |
US3612196A (en) * | 1970-05-01 | 1971-10-12 | Smith International | Rock-boring cutter |
US3679009A (en) * | 1971-02-02 | 1972-07-25 | Kennametal Inc | Rotary cutter for excavation, especially for use with raise boring and tunnel boring machines |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2593548A1 (en) * | 1986-01-28 | 1987-07-31 | Boart Int Ltd | CUT DISC FOR ROCK WORKING MACHINE |
US4793427A (en) * | 1986-01-28 | 1988-12-27 | Boart International Limited | Disc cutters for rock working machines |
AT391164B (en) * | 1986-01-28 | 1990-08-27 | Boart Int Ltd | DISC CUTTERS FOR STONE MACHINING MACHINES |
US5234064A (en) * | 1992-03-09 | 1993-08-10 | The Robbins Company | Roller cutter assembly having adjustable ring cutter spacing |
EP0602753A1 (en) * | 1992-12-17 | 1994-06-22 | CBK TRADING S.r.l. | Cutting disk for rock and similar materials |
US5626201A (en) * | 1993-09-20 | 1997-05-06 | Excavation Engineering Associates, Inc. | Disc cutter and method of replacing disc cutters |
US5904211A (en) * | 1993-09-20 | 1999-05-18 | Excavation Engineering Associates, Inc. | Disc cutter and excavation equipment |
US5961185A (en) * | 1993-09-20 | 1999-10-05 | Excavation Engineering Associates, Inc. | Shielded cutterhead with small rolling disc cutters |
US20060144200A1 (en) * | 2003-01-10 | 2006-07-06 | Sandra Duden | Cutting ring for disk rolls pertaining to partial and/or full cutting machines |
US20090079256A1 (en) * | 2007-09-25 | 2009-03-26 | Caterpillar Inc. | Rotary cutter for tunnel boring machine |
US7997659B2 (en) | 2007-09-25 | 2011-08-16 | Caterpillar Inc. | Rotary cutter for tunnel boring machine |
US10018042B2 (en) * | 2015-10-30 | 2018-07-10 | The Robbins Company | Clamped-ring cutter assembly for tunnel boring machine |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HUGHES TOOL COMPANY A CORP OF DE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GENERAL ELECTRIC COMPANY;REEL/FRAME:003967/0068 Effective date: 19820216 |
|
AS | Assignment |
Owner name: HUGHES TOOL COMPANY - USA, A CORP OF DE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:HUGHES TOOL COMPANY, A CORP OF DE;REEL/FRAME:004368/0605 Effective date: 19850205 |
|
AS | Assignment |
Owner name: SANDVIK ROCK TOOLS, INC., 1717, WASHINGTON COUNTY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HUGHES TOOL COMPANY - U.S.A.;REEL/FRAME:004805/0275 Effective date: 19871120 Owner name: SANDVIK ROCK TOOLS, INC., 1717, WASHINGTON COUNTY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:HUGHES TOOL COMPANY - U.S.A.;REEL/FRAME:004805/0275 Effective date: 19871120 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES) |