AU2009277014A1 - Cutting bit for mining and excavating tools - Google Patents
Cutting bit for mining and excavating tools Download PDFInfo
- Publication number
- AU2009277014A1 AU2009277014A1 AU2009277014A AU2009277014A AU2009277014A1 AU 2009277014 A1 AU2009277014 A1 AU 2009277014A1 AU 2009277014 A AU2009277014 A AU 2009277014A AU 2009277014 A AU2009277014 A AU 2009277014A AU 2009277014 A1 AU2009277014 A1 AU 2009277014A1
- Authority
- AU
- Australia
- Prior art keywords
- cutting bit
- diameter
- extended collar
- insert
- cutting
- 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.)
- Abandoned
Links
- 238000005520 cutting process Methods 0.000 title claims description 79
- 238000005065 mining Methods 0.000 title description 9
- 230000007704 transition Effects 0.000 claims description 9
- 230000004323 axial length Effects 0.000 claims description 8
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 6
- 238000005219 brazing Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 241000277275 Oncorhynchus mykiss Species 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000005552 hardfacing Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 229910003468 tantalcarbide Inorganic materials 0.000 description 1
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Earth Drilling (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Description
WO 2010/014327 PCT/US2009/049028 CUTTING BIT FOR MINING AND EXCAVATING TOOLS FIELD OF THE INVENTION 100011 The present invention relates to mining and excavating tools and, more particularly, is concerned with a cutting bit designed for erosion resistance. BACKGROUND INFORMATION [0002] Mining and excavating tools often employ drums and the like on which are mounted many cutting bits. 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". [0003] Wear-resistant cutting bits have been developed in order to increase erosion resistance. 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. [0004] Despite these known designs, a need still exists for cutting bits which exhibit improved wear resistance thereby extending the life of the bit and reducing operating costs. 100051 The present invention has been developed in view of the foregoing. SUMMARY OF THE INVENTION [0006] 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 WO 2010/014327 PCT/US2009/049028 -2 present invention to be more wear-resistant and cost-effective than other cutting bits used on mining and excavating equipment. 100071 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. [00081 Another aspect of the present invention provides a cutting bit comprising a forward portion and a shank oriented about a longitudinal axis, the forward portion having a socket, a hardened insert affixed to the socket of the forward portion, the hardened insert comprising a generally conical portion adjacent an extended collar adjacent and transition segment adjacent a reduced diameter base, wherein the reduced diameter base and transition section fit into the socket of the forward portion. [0009] These and other aspects will become more apparent from the following description. BRIEF DESCRIPTION OF THE DRAWINGS [00101 Fig. 1 is an exploded, oblique view of a cutting bit and bit holder comprising a base block and sleeve according to one embodiment of the present invention. [00111 Fig. 2 is a side view of a cutting bit with a section of the nose cut away around the hardened tip. [0012] Fig. 3 is a side view of a hardened tip according to one embodiment of the present invention. 100131 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. [0014] 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. DETAILED DESCRIPTION 10015] Referring now to Fig. 1, a cutting assembly 1 is shown. The cutting assembly 1 includes a base block 10 which mounts onto a rotating drum or other piece of WO 2010/014327 PCT/US2009/049028 -3 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. [00161 Referring now to Fig. 2, a more detailed side view of the cutting bit 30 according to one embodiment of the present invention is shown. 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. At the axially forward end 70 of the cutting bit 30 is a hardened insert 100 located into a socket 90 in the forward portion 50 of the cutting bit 30. [0017] 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. [0018] In the embodiment shown in Fig. 2, 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, [0019] Referring now to Fig. 3, the hardened insert 100 will now be described in more detail. At the axially forward end 70 the hardened insert 100 has generally conical portion 110 ending at a cutting tip 120. As used herein 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 is a reduced diameter base 150. The reduced diameter base 150 may be any suitable shape, for example cylindrical and/or conical. As used herein, phrase "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 WO 2010/014327 PCT/US2009/049028 -4 collar 130 may have an extended collar diameter 132 of about 15 mm to about 35 mm, for example about 25 mm. Although, the embodiment in Fig. 3, shows a reduced diameter base having a uniform diameter, non-uniform shapes of varying diameter are also contemplated. [0020] 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. [0021] Hardened inserts 100 typically wear along the generally conical portion 110 at an angle of 900 to 120*, for example 1100. The wear angle, denoted 6, is illustrated in Fig. 3. As described above, 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. As a consequence, 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. [0022] In one embodiment of the present invention shown in Fig. 4, the cutting bit 200 has a hardened exterior surface placed about the nose 252 of the forward portion 250. In this embodiment, 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. [00231 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. In this WO 2010/014327 PCT/US2009/049028 -5 embodiment, the nose 352 of the forward portion 350 has a wear-resistant exterior comprising a hardfacing weld 354. In the embodiments shown in Figs. 4-5 the exterior of the nose 252, 352 has been hardened to at least a hardness 50 RWc. In other embodiments, the forward portion may be made from a hardened or alloy steel to provide wear-resistance. [0024] In addition to exceptional life, 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. [0025] 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. [0026] Some improvement in the life of the bits was expected due to a slight increase in the amount of material used in the inserts of the present invention compared to standard cutting bits. However, a 3:1 increase in cutting bit life exceeded expectation considering a less than 2:1 increase in hardened material was added to the cutting bits. [0027] Whereas particular embodiments of this invention have been described above for purposes of illustration, it will be evident to those skilled in the art that numerous variations of the details of the present invention may be made without departing from the invention as defined in the appended claims.
Claims (18)
1. An insert for a cutting bit comprising: a 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 adjacent the extended collar; and a reduced diameter base adjacent the tapered transition segment.
2. The insert for a cutting bit of claim 1, wherein the reduced diameter base has a diameter which is about 35% to about 85% of the diameter of the extended collar.
3. The insert for a cutting bit of claim 1, wherein the reduced diameter base has a diameter which is about 70% of the diameter of the extended collar.
4. The insert for a cutting bit of claim 1, wherein the hardened bit is made from cemented tungsten carbide.
5. The insert for a cutting bit of claim 1, wherein the extended collar has a diameter of about 15 mm to about 35 mm.
6. The insert for a cutting bit of claim 1, wherein the extended collar has a diameter of about 25 mm.
7. The insert for a cutting bit of claim 1, wherein the extended collar has an axial length of about 5 mm to about 35 mm.
8. The insert for a cutting bit of claim 1, wherein the extended collar has an axial length of about 10 mm. WO 2010/014327 PCT/US2009/049028 -7
9. A cutting bit comprising: a forward portion and a shank oriented about a longitudinal axis, the forward portion having a socket; a hardened insert affixed to the socket of the forward portion, the hardened insert comprising a generally conical portion adjacent an extended collar adjacent and transition segment adjacent a reduced diameter base, wherein the reduced diameter base and transition section fit into the socket of the forward portion.
10. The a cutting bit of claim 9, wherein the reduced diameter base has a diameter which is about 35% to about 85% of the diameter of the extended collar.
11. The cutting bit of claim 9, wherein the reduced diameter base has a diameter which is about 70% of the diameter of the extended collar.
12. The cutting bit of claim 9, wherein the hardened bit is made from cemented tungsten carbide.
13. The cutting bit of claim 9, wherein the extended collar has a diameter of about 15 mm to about 35 mm.
14. The cutting bit of claim 9, wherein the extended collar has a diameter of about 25 mm.
15. The cutting bit of claim 9, wherein the extended collar has an axial length of about 5 mm to about 35 mm.
16. The cutting bit of claim 9, wherein the extended collar has an axial length of about 10 mm. WO 2010/014327 PCT/US2009/049028
17. The cutting bit of claim 9, wherein the hardened insert is affixed to the socket by brazing.
18. The cutting bit of claim 9, further comprising a wear-resistant sheath affixed to the forward portion.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/180,584 | 2008-07-28 | ||
US12/180,584 US20100018776A1 (en) | 2008-07-28 | 2008-07-28 | Cutting bit for mining and excavating tools |
PCT/US2009/049028 WO2010014327A2 (en) | 2008-07-28 | 2009-06-29 | Cutting bit for mining and excavating tools |
Publications (1)
Publication Number | Publication Date |
---|---|
AU2009277014A1 true AU2009277014A1 (en) | 2010-02-04 |
Family
ID=41567631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU2009277014A Abandoned AU2009277014A1 (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 |
---|---|---|---|---|
EP3207216A4 (en) * | 2014-10-17 | 2018-07-25 | Vermeer Manufacturing Company | Protective wear sleeve for cutting element |
AU2016246137A1 (en) | 2015-04-10 | 2017-10-26 | Joy Global Underground Mining Llc | Cutting bit and extraction tool for same |
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 |
Family Cites Families (29)
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 |
US4725099A (en) * | 1985-07-18 | 1988-02-16 | Gte Products Corporation | Rotatable cutting bit |
US4865392A (en) * | 1985-07-18 | 1989-09-12 | Gte Products Corporation | Rotatable cutting bit |
US4725098A (en) * | 1986-12-19 | 1988-02-16 | Kennametal Inc. | Erosion resistant cutting bit with hardfacing |
US4911503A (en) * | 1988-07-20 | 1990-03-27 | Kennametal Inc. | Earth engaging cutter bit |
US4911504A (en) * | 1988-07-20 | 1990-03-27 | Kennametal Inc. | Cutter bit and tip |
US4981328A (en) * | 1989-08-22 | 1991-01-01 | Kennametal Inc. | Rotatable tool having a carbide insert with bumps |
US5219209A (en) * | 1992-06-11 | 1993-06-15 | Kennametal Inc. | Rotatable cutting bit insert |
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 |
US6375272B1 (en) * | 2000-03-24 | 2002-04-23 | Kennametal Inc. | Rotatable cutting tool insert |
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 |
US7669938B2 (en) * | 2006-08-11 | 2010-03-02 | Hall David R | Carbide stem press fit into a steel body of a pick |
US8033616B2 (en) * | 2006-08-11 | 2011-10-11 | Schlumberger Technology Corporation | Braze thickness control |
US7611210B2 (en) * | 2006-08-21 | 2009-11-03 | Kennametal Inc. | Cutting bit body and method for making the same |
CN101889127B (en) * | 2007-12-05 | 2013-06-05 | 山特维克知识产权股份有限公司 | 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 |
EP2238299A4 (en) * | 2008-01-08 | 2015-06-17 | Esco Corp | Tip for an earth working roll |
-
2008
- 2008-07-28 US US12/180,584 patent/US20100018776A1/en not_active Abandoned
-
2009
- 2009-06-29 AU AU2009277014A patent/AU2009277014A1/en not_active Abandoned
- 2009-06-29 WO PCT/US2009/049028 patent/WO2010014327A2/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
US20100018776A1 (en) | 2010-01-28 |
WO2010014327A3 (en) | 2010-04-08 |
WO2010014327A2 (en) | 2010-02-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MK4 | Application lapsed section 142(2)(d) - no continuation fee paid for the application |