WO2010014327A2 - Cutting bit for mining and excavating tools - Google Patents
Cutting bit for mining and excavating tools Download PDFInfo
- Publication number
- WO2010014327A2 WO2010014327A2 PCT/US2009/049028 US2009049028W WO2010014327A2 WO 2010014327 A2 WO2010014327 A2 WO 2010014327A2 US 2009049028 W US2009049028 W US 2009049028W WO 2010014327 A2 WO2010014327 A2 WO 2010014327A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cutting bit
- diameter
- cutting
- extended collar
- insert
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/18—Mining picks; Holders therefor
- E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/18—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
- B28D1/186—Tools therefor, e.g. having exchangeable cutter bits
Definitions
- the present invention relates to mining and excavating tools and, more particularly, is concerned with a cutting bit designed for erosion resistance.
- Each cutting bit typically has a hard wear-resistant tip made of a material such as tungsten carbide attached to a generally conical steel head of the bit.
- a problem with such designs is that the softer steel head material erodes during cutting operations. This is commonly referred to as "steel wash”.
- U.S. Patent No. 4,725,098 to Beach discloses the deposition of a hard-facing material about the steel nose of a cutting bit.
- U.S. Patent No. 5,417,475 to Graham et al. discloses the installation of a ring of hard material on the front surface of a steel nose of a cutting bit.
- U.S. Patent No. 6,709,065 to Peay et al. discloses the use of a ledge of hard material mounted near the steel nose of a cutting bit.
- Published U.S. Application No. 2005/0035649 to Mercier et al. discloses the installation of hard wear rings on a stepped shoulder of a cutting bit.
- the present invention provides a wear-resistant cutting bit for use on a mining or excavating cutting tool.
- the cutting bit utilizes a hardened insert having a narrow base attached to the remainder of the cutting bit.
- An extended collar of the hardened insert projects from the cutting bit and ends with a generally conical section.
- the extended collar and narrow base of the hardened insert enable the cutting bits of the present invention to be more wear-resistant and cost-effective than other cutting bits used on mining and excavating equipment.
- An aspect of the present invention provides an insert for a cutting bit comprising a forward most generally conical portion, an extended collar adjacent and rearward of the generally conical portion, the extended collar portion having a diameter and an axial length, a tapered transition segment and a reduced diameter base.
- FIG. 1 is an exploded, oblique view of a cutting bit and bit holder comprising a base block and sleeve according to ono embodiment of the present invention.
- Fig. 2 is a side view of a cutting bit with a section of the nose cut away around the hardened tip.
- Fig. 3 is a side view of a hardened tip according to one embodiment of the present invention.
- FIG. 4 is a side view of a cutting bit with a hardened ring about the forward portion according to one embodiment of the present invention
- FIG. 5 is a side view of a cutting bit with a hardened ring about the forward portion according to one embodiment of the present invention.
- the cutting assembly 1 includes a base block 10 which mounts onto a rotating drum or other piece of equipment.
- a sleeve 20 fits inside an opening 12 in the base block 10.
- Cutting bit 30 inserts into a bore 22 of the sleeve 20.
- Sleeve 20 and cutting bit 30 may be secured to the opening 12 and bore 22 through appropriate means known to those skilled in the art, for example, by press fitting, by using a retainer ring or other fastening means.
- Cutting bit 30 may have a shank 40 and forward portion 50 separated by a flared collar 60.
- the cutting bit 30 may be situated about a longitudinal axis 2.
- the cutting bit 30 has an axially forward end 70 and an axially rearward 80 in relation to the longitudinal axis 2.
- a hardened insert 100 located into a socket 90 in the forward portion 50 of the cutting bit 30.
- Hardened insert 100 may be any number of wear materials, including tungsten carbide, titanium carbide and tantalum carbide, aluminum oxide, titanium nitride, cobalt, cubic boron nitride, polycrystalline diamond, and may include other ceramics, and alloys and cermets of these materials. Hardened insert 100 is typically made of cemented tungsten carbide and is brazed into the socket 90 or attached by any other method known to those skilled in the art.
- the shank 40 of the cutting bit 30 has a retainer 42 near the axially rearward end 80.
- This retainer 42 provides a seating surface for press fitting the cutting bit 30 into the sleeve 20.
- the hardened insert 100 At the axially forward end 70 the hardened insert 100 has generally conical portion 110 ending at a cutting tip 120.
- the phrase "generally conical" desribes a portion of the cutting tip being shaped like a cone and includes frustoconical and pyramidal shapes.
- Rearward of the generally conical section 110 is an extended collar 130.
- Rearward of the extended collar 130 is an inwardly tapering transition segment 140.
- Rearward of the transition segment 140 Rearward of the transition segment 140 is a reduced diameter base 150.
- the reduced diameter base 150 may be any suitable shape, for example cylindrical and/or conical.
- reduced diameter describes a diameter of the base of the hardened insert being of lesser diameter than the diameter of the extended collar of the hardened insert.
- the reduced diameter base 150 may be about 85% to about 35%, for example about 70% of the diameter of the extended collar 130.
- the extended collar 130 may have an extended collar diameter 132 of about 15 mm to about 35 mm, for example about 25 mm.
- the embodiment in Fig. 3 shows a reduced diameter base having a uniform diameter, non-uniform shapes of varying diameter are also contemplated.
- the reduced diameter base 150 enables the forward portion 50 to withstand a significant amount of wear before resulting in cutting bit failure.
- Forward portion 50 and shank portion are typically made of carbon steel. Still referring to Fig. 3, a wear area 52 is illustrated by the phantom line 53. This is a high wear area 52 in cutting bits.
- the relatively soft carbon steel of the forward end abrades much faster than the hardened insert 100. Due to the reduced diameter of the base 150, the wider extended collar 130 and conical section 110 protect the base 150 and the steel of the forward portion 50 adjacent to the base 150 from much abrasion. This maintains the integrity of the steel and brazing securing the hardened insert for a much longer time than would be achievable with an insert of uniform diameter.
- Hardened inserts 100 typically wear along the generally conical portion 110 at an angle of 90° to 120°, for example 110°.
- the wear angle, denoted ⁇ is illustrated in Fig. 3.
- the hardened insert 100 has an extended collar 130 designed to extend useful life of the cutting bit 30.
- the extended collar 130 may be generally cylindrical and has an axial length 134 illustrated in Fig. 3.
- the axial length 134 may be about 5 mm to about 35 mm, for example about 10 mm.
- the hardened insert 100 is able to wear from the cutting tip 120 position shown in Fig. 3 through to position A. In most instances, the reduced diameter base 150 allows wear of the cutting bit 30 even beyond position A before the cutting bit 150 ultimately fails.
- the cutting bit 200 has a hardened exterior surface placed about the nose 252 of the forward portion 250.
- the hardened exterior surface is a sheath 220 made from cemented tungsten carbide.
- the nose 252 may be slightly recessed about the periphery of the forward portion 250 to accommodate the sheath 220 or the sheath 220 may be fit over an unrecessed periphery of the nose 252.
- the sheath 220 may be affixed to the forward portion 250 by brazing or other known method.
- FIG. 5 Another embodiment incorporating a hardened exterior surface about the nose 352 of the forward portion of the cutting bit 300 is shown in Fig. 5.
- the nose 352 of the forward portion 350 has a wear-resistant exterior comprising a hardfacing weld 354.
- the exterior of the nose 252, 352 has been hardened to at least a hardness 50 RWc.
- the forward portion may be made from a hardened or alloy steel to provide wear-resistance.
- the cutting bits of the present invention have shown an ability to reduce sparking during mining operations. At times, the atmosphere in underground mines can become combustible. It is therefore desirable to reduce ignition sources, such as sparks, in mining equipment.
- Test results demonstrating the performance of the cutting bits according to one embodiment of the present invention have shown a 3:1 improvement in wear.
- Tests of the cutting bits of the present invention were performed on a single continuous mining machine having two drums. One drum was equipped with standard cutting bits while the second drum was equipped with cutting bits of the present invention.
- the test setup ensured the standard cutting bits and the cutting bits of the present invention where used under identical conditions, e.g. the material cut, time in operation and rate of cutting.
- the cutting bits were run until failure.
- the standard cutting bits lasted for one 8-hour shift while the cutting bits of present invention cut for three 8-hour shifts.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2009277014A AU2009277014A1 (en) | 2008-07-28 | 2009-06-29 | Cutting bit for mining and excavating tools |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/180,584 US20100018776A1 (en) | 2008-07-28 | 2008-07-28 | Cutting bit for mining and excavating tools |
US12/180,584 | 2008-07-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2010014327A2 true WO2010014327A2 (en) | 2010-02-04 |
WO2010014327A3 WO2010014327A3 (en) | 2010-04-08 |
Family
ID=41567631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2009/049028 WO2010014327A2 (en) | 2008-07-28 | 2009-06-29 | Cutting bit for mining and excavating tools |
Country Status (3)
Country | Link |
---|---|
US (1) | US20100018776A1 (en) |
AU (1) | AU2009277014A1 (en) |
WO (1) | WO2010014327A2 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20170254201A1 (en) * | 2014-10-17 | 2017-09-07 | Vermeer Manufacturing Company | Protective wear sleeve for cutting element |
US20160298453A1 (en) * | 2015-04-10 | 2016-10-13 | Joy Mm Delaware, Inc. | Bit assembly for cutter head |
USD780558S1 (en) * | 2016-01-11 | 2017-03-07 | Supplier Of Solutions, Llc | Tool support sleeve |
USD818507S1 (en) | 2017-02-28 | 2018-05-22 | Kennametal Inc | Replaceable tip for a rotatable cutting tool |
USD863386S1 (en) | 2018-06-06 | 2019-10-15 | Kennametal Inc. | Ribbed cutting insert |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4725098A (en) * | 1986-12-19 | 1988-02-16 | Kennametal Inc. | Erosion resistant cutting bit with hardfacing |
US5219209A (en) * | 1992-06-11 | 1993-06-15 | Kennametal Inc. | Rotatable cutting bit insert |
US6375272B1 (en) * | 2000-03-24 | 2002-04-23 | Kennametal Inc. | Rotatable cutting tool insert |
US20080042484A1 (en) * | 2006-08-21 | 2008-02-21 | Majagi Shivanand I | Cutting bit body and method for making the same |
Family Cites Families (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3830546A (en) * | 1973-03-01 | 1974-08-20 | Kennametal Inc | Mining tool and support block therefor |
SE450259C (en) * | 1983-03-23 | 1996-07-04 | Sandvik Ab | Tools for breaking or cutting solid materials such as asphalt |
US4497520A (en) * | 1983-04-29 | 1985-02-05 | Gte Products Corporation | Rotatable cutting bit |
US4627665A (en) * | 1985-04-04 | 1986-12-09 | Ss Indus. | Cold-headed and roll-formed pick type cutter body with carbide insert |
US4865392A (en) * | 1985-07-18 | 1989-09-12 | Gte Products Corporation | Rotatable cutting bit |
US4725099A (en) * | 1985-07-18 | 1988-02-16 | Gte Products Corporation | Rotatable cutting bit |
US4911504A (en) * | 1988-07-20 | 1990-03-27 | Kennametal Inc. | Cutter bit and tip |
US4911503A (en) * | 1988-07-20 | 1990-03-27 | Kennametal Inc. | Earth engaging cutter bit |
US4981328A (en) * | 1989-08-22 | 1991-01-01 | Kennametal Inc. | Rotatable tool having a carbide insert with bumps |
US5324098A (en) * | 1992-12-17 | 1994-06-28 | Kennametal Inc. | Cutting tool having hard tip with lobes |
US5837071A (en) * | 1993-11-03 | 1998-11-17 | Sandvik Ab | Diamond coated cutting tool insert and method of making same |
US5415462A (en) * | 1994-04-14 | 1995-05-16 | Kennametal Inc. | Rotatable cutting bit and bit holder |
EP0757157A4 (en) * | 1995-02-16 | 1999-01-07 | Tovarschestvo Sogranichennoi O | Instrument for breaking up solid material |
US6199451B1 (en) * | 1996-09-09 | 2001-03-13 | The Sollami Company | Tool having a tungsten carbide insert |
DE19803166C2 (en) * | 1998-01-28 | 2000-05-11 | Betek Bergbau & Hartmetall | Round shank chisels for a cutting machine or the like |
DE19857451A1 (en) * | 1998-12-12 | 2000-06-15 | Boart Hwf Gmbh Co Kg | Cutting or breaking tool and cutting insert for this |
US6196636B1 (en) * | 1999-03-22 | 2001-03-06 | Larry J. McSweeney | Cutting bit insert configured in a polygonal pyramid shape and having a ring mounted in surrounding relationship with the insert |
US6270165B1 (en) * | 1999-10-22 | 2001-08-07 | Sandvik Rock Tools, Inc. | Cutting tool for breaking hard material, and a cutting cap therefor |
SE515294C2 (en) * | 1999-11-25 | 2001-07-09 | Sandvik Ab | Rock drill bit and pins for striking drilling and method of manufacturing a rock drill bit for striking drilling |
US20040026983A1 (en) * | 2002-08-07 | 2004-02-12 | Mcalvain Bruce William | Monolithic point-attack bit |
US6986552B1 (en) * | 2003-11-03 | 2006-01-17 | The Sollami Company | Hardened rotary cutting tip |
US7661765B2 (en) * | 2006-08-11 | 2010-02-16 | Hall David R | Braze thickness control |
US7669938B2 (en) * | 2006-08-11 | 2010-03-02 | Hall David R | Carbide stem press fit into a steel body of a pick |
CA2707262A1 (en) * | 2007-12-05 | 2009-06-11 | Sandvik Intellectual Property Ab | Breaking or excavating tool with cemented tungsten carbide insert and ring, material removing machine incorporating such a tool and method of manufacturing such a tool |
WO2009089322A1 (en) * | 2008-01-08 | 2009-07-16 | Esco Corporation | Tip for an earth working roll |
-
2008
- 2008-07-28 US US12/180,584 patent/US20100018776A1/en not_active Abandoned
-
2009
- 2009-06-29 WO PCT/US2009/049028 patent/WO2010014327A2/en active Application Filing
- 2009-06-29 AU AU2009277014A patent/AU2009277014A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4725098A (en) * | 1986-12-19 | 1988-02-16 | Kennametal Inc. | Erosion resistant cutting bit with hardfacing |
US5219209A (en) * | 1992-06-11 | 1993-06-15 | Kennametal Inc. | Rotatable cutting bit insert |
US6375272B1 (en) * | 2000-03-24 | 2002-04-23 | Kennametal Inc. | Rotatable cutting tool insert |
US20080042484A1 (en) * | 2006-08-21 | 2008-02-21 | Majagi Shivanand I | Cutting bit body and method for making the same |
Also Published As
Publication number | Publication date |
---|---|
US20100018776A1 (en) | 2010-01-28 |
AU2009277014A1 (en) | 2010-02-04 |
WO2010014327A3 (en) | 2010-04-08 |
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