AU650602B2 - Carbide tip and pick - Google Patents
Carbide tip and pick Download PDFInfo
- Publication number
- AU650602B2 AU650602B2 AU22852/92A AU2285292A AU650602B2 AU 650602 B2 AU650602 B2 AU 650602B2 AU 22852/92 A AU22852/92 A AU 22852/92A AU 2285292 A AU2285292 A AU 2285292A AU 650602 B2 AU650602 B2 AU 650602B2
- Authority
- AU
- Australia
- Prior art keywords
- tip
- apex
- face
- extended tail
- tail portion
- 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.)
- Ceased
Links
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 14
- 239000011707 mineral Substances 0.000 claims description 14
- 238000005520 cutting process Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 4
- 229910003461 carbide mineral Inorganic materials 0.000 claims description 3
- 241000243251 Hydra Species 0.000 claims description 2
- QRXWMOHMRWLFEY-UHFFFAOYSA-N isoniazide Chemical compound NNC(=O)C1=CC=NC=C1 QRXWMOHMRWLFEY-UHFFFAOYSA-N 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000003245 coal Substances 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 230000003292 diminished effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- XNQCXEBZBVDKAL-UHFFFAOYSA-N OSSS Chemical compound OSSS XNQCXEBZBVDKAL-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 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
-
- 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
- E21C35/1837—Mining picks; Holders therefor with inserts or layers of wear-resisting material characterised by the shape
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)
- Excavating Of Shafts Or Tunnels (AREA)
Description
650602
AUSTRALIA
Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT r Name of Applicant(s): Actual Inventor(s): Address for Service: Invention Title: HYDRA TOOLS INTERNATIONAL PLC GORDON ALAN McSHANNON CULLEN CO., Patent Trade Mark Attorneys, 240 Queen Street, Brisbane, Qld. 4000, Australia.
CARBIDE TIP AND PICK The following statement is a full description of this invention, including the best method of performing it known to us: S@ S
OS
9 98 5* 0 0
S*
00 9 09 9* 0 S S
SS
S.
S S S5 0@ 90 99 9
S
0 9. 9 la CARBIDE TIP AND PICK This invention relates to a carbide mineral cutting tip, and to a mineral cutter pick provided with such a tip.
In the winning of minerals such as coal, industry-standard cutter picks of various types, (such as radial picks, and forward attack picks), are established in extensive use, all being of steel, with a tipreceiving recess machined into the top, upper face of the 10 head of the pick, and with a tip brazed in position in the recess. With industry-standard tip designs after some 10% to 20% of wear has occurred on a top edge of the tip, the steel of the pick head is exposed, and disadvantageously begins a rubbing action on the mineral 15 being mined and/or on rock overlying or underlying the mineral seam involved and disadvantageous quartz pick up occurs. More seriously, if coal is involved, release of methane as the seam is won frequently leads to spontaneous ignition at the so-called incentive sparking 20 zone behind the tip due to the elevated temperature of the pick adjacent this zone, leading to the need for various ventilating and/or water quenching precautions, with attendant costs. Furthermore, early tip wear and diminished cutting efficiency leads to an early need for 25 pick changing typically after 3 4- shifts of coal mining is involved requiring perhaps one hour down time to change a rotary head having say 50 picks.
A basic object of the invention is to provide a carbide tip and mineral cutter pick of increased workiLng life and diminished propensity for spark ignitions.
According to a first aspect of the invention there is provided, a carbide mineral cutting tip comprising a solid carbide body having at least one front face; at least one top face, a bottom, seating face; a rear face; and side faces, the rear face being provided at the end of an extended tail portion of the tip, whereby the front-to-rear lengts of the tip approximates to twice the depth of the tip represented by the top-to- S9 S 0S B 99 9 OSSS*9 0 00 SO 5 0 9 bottom length of the front face.
According to a second aspect of the present invention, there is provided a mineral cutter pick incorporating a tip as defined above.
Thus, with the tip and picks in accordance with the invention the tip is extended rearwardly so that its front to rear length is approximately twice that of an industry-standard tip. Tests have indicated that with the tip and pick in accoxrdance with the invention at 10 least 50% tip wear must occur before the steel of the pick head becomes exposed for steel-to-rock contact.
Consequently, the pick life is extended by some Apart from reduced costs resulting from the reduced number of picks required to mine the same tonnage of 15 mineral, added savings are provided by reducing down time by half for pick changing operations.
Preferably, the front face of the tip is defined by two angled faces converging to a front apex.
O0* The top face may similarly be defined by two faces 20 converging to a top apex. The bottom seating face may be planar. With regard to the extended tail portion, this may also have a bottom, seating face contiguous with that o of the main tip portion. It may also have a top face defined by two faces converging to a top apex contiguous 25 with the top apex of the main tip portion by preferably at increased back clearance angle. The rear face may be defined by a first face parallel or generally so, to the front face, and leading by a chamfered face to the bottom, seating face.
Clearly, the tip-receiving recess of the head of the pick in accordance with the second aspect needs to be machined to a profile to match that of the bottom, seating faces, and rear face(s) of the tip in accordance with the first aspect.
The invention will now be further described by way of examples, with reference to the accompanying drawings, in which:- Figure 1 is a side elevation of a radial mineral cutter pick in accordance with the second aspect of the invention, provided with a carbide tip in accordance with the first aspect of the invention; and Figure 2 corresponds to Figure 1 but illustrates a forward attack pick.
In both Figures, like components are accorded like reference numerals.
A mineral cutter pick 1 is of forged steel having a rectangular section shank 2 adapted to be 10 received, releasable in an aperture of corresponding profile, of a pick box (not shown) secured by welding to a rotary cutting head of a mineral winning machine, e.g.
a so-called shearer, or a tunnel
PS
.0 00
S
S
S S we OS S 0 06
S
000000 0 SO SO S S 0 4 or underground roadway driving machine, e.g. a so-called roadheader. This shank 2 is integral with an enlarged head 3 which may be offset, as shown in Figure 1, to constitute an industry-standard radial pick, or may be generally in line, as shown in Figure 2, to constitute an industry-standard forward attack pick.
Into the terminal end of the head 3 remote from the shank 2 is machined a generally "L"-shaped receiving recess 4 for a solid carbide tip :10 The tip 5 has a front face 6 defined by two angled Sfaces 7 converging to a front apex 8; has a top face 9 also defined by two faces 10 converging to a top apex 11: and has a planar, bottom seating face 12 and has lateral side faces 13.
In the front-to-rear direction defined between lines A and B, s.
15 is a main tip portion 14, which alone may be considered as an industry-standard tip, and when wear has occurred with such a S tip, only as far as line L1 (Figure disadvantageous steelto-mineral contact will occur between the head 2 and the espec mineral involved. In accordance with a first ge ftur.. of the invention, the tip 1 includes an extended tail portion defined between lines B and C, so that the tip 1 has an overall front-to-rear length defined between lines A and C, which length A to C is approximately twice the depth of the tip 1 represented by the top-to-bottom length of the front face 6 defined between lines D and E. The portions 14 and are of course integrally produced during conventional carbide pressing and sintering operations.
S4f.\ The extended tail portion 15 has a bottom seating face contiguous with the face 12 of the main tip portion 14, and also has a top face 17 defined by two faces 18 converging to a top apex 19 contiguous with the top apex 11 of the main tip portion 14 but, as can be seen from Figures 1 and 2, of increased back rake angle. Finally, the extended tail portion 15 has a rear face 20 defined by a first face 21 parallel to the front face 6 of the main tip portion 14 and leading by a chamfered face 22, to the bottom seating face 16.
1. Tests have shown that with the tip 1 in g. accordance with the invention, comprising a main tip portion 14 and an extended tail portion 15, no disadvantageous steel-to-mineral contact occurs until o.
S wear reaches line L2 (Figure With the tips 1 as 15 illustrated, this means that some 50% of the carbide tip 1 must be worn away before the steel of the pick head becomes exposed for rock etc contact. This provides for a substantial extension of pick life by approximately compared with picks provided with industry-standard forms 20 of carbide tips; for a reduced number of pick changes and hence reduced non-productive labour costs and also reduced down time of the associated shearer or roadheader and hence increased production; for a reduced number of 0 pick purchases for a mine operator and for reduced 25 underground transportation costs.
Claims (4)
1. A carbide mineral cutting tip comprising solid carbide body having at least one front edge defined by two angled front faces converging to an apex; at least one top face; a bottom, seating face, a rear face defined by a first face parallel to said front edge and leading to said bottom seating face; and lateral side faces, said tip comprising a main tip portion and an extended tail portion, said rear face being provided at a terminal end 10 of said extended tail portion of said tip, whereby a front-to-rear length of said tip approximates to twice the depth of said tip represented by the top-to-bottom length of said front edge with two faces converging to an apex defining a top edge of said main tip portion, with 15 two further faces converging to an apex defining edge of said extended tail portion, said top apex of said extended tail portion being contiguous with a top apex of said main tip portion, and said top apex of said extended tail portion having an increased back clearance angle 20 compared with that of. said top apex of said main tip portion, said clearance angle being defined relative a plane orthogonal to said front edge.
2. A tip as claimed in claim 1, wherein said 6 bottom seating face is planar. *25
3. A tip as claimed in claim 1, wherein said extended tail portion has a bottom seating face contiguous with said bottom seating face of said main tip portion.
4. A mineral cutter pick provided with a carbide tip comprising a solid carbide body having at least one front edge defined by two angled front faces converging to an apex; at least one top face, a bottom, seating face, a rear face defined by a first face parallel to said front edge and leading to said bottom seating face; and lateral side faces, said tip comprising a main tip portion and an extended tail portion, said rear face being provided at a terminal end of said extended tail y portion of said tip, whereby a front-to-rear length of said tip approximates to twice the depth of said tip represented by the top-to-bottom length of said front edge with two faces converging to an apex defining a top edge of said main tip portion, with two further faces converging to an apex defining edge of said extended tail portion, said top apex of said extended tail portion being contiguous with a top apex of said main tip portion, and said top apex of said extended tail portion having an increased back clearance angle compared with 10 that of said top apex of said main tip portion said clearance angle being defined relative a plane orthogonal to said front edge. DATED this 2nd day of December 1993 0. HYDRA TOOLS INTERNATIONAL PLC 15 By their Patent Attorneys o& CULLEN CO. e •e S C I *0 0 S
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9120835A GB2260149B (en) | 1991-10-01 | 1991-10-01 | Carbide tip and pick |
| GB9120835 | 1991-10-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2285292A AU2285292A (en) | 1993-04-08 |
| AU650602B2 true AU650602B2 (en) | 1994-06-23 |
Family
ID=10702245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU22852/92A Ceased AU650602B2 (en) | 1991-10-01 | 1992-09-09 | Carbide tip and pick |
Country Status (8)
| Country | Link |
|---|---|
| AU (1) | AU650602B2 (en) |
| CA (1) | CA2078417A1 (en) |
| CZ (1) | CZ279561B6 (en) |
| FR (1) | FR2681901A1 (en) |
| GB (1) | GB2260149B (en) |
| HU (1) | HU9202944D0 (en) |
| SK (1) | SK278861B6 (en) |
| ZA (1) | ZA926873B (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1085757A (en) * | 1964-10-16 | 1967-10-04 | Austin Hoy & Co Ltd | Improvements in or relating to cutter picks |
| US4674802A (en) * | 1982-09-17 | 1987-06-23 | Kennametal, Inc | Multi-insert cutter bit |
-
1991
- 1991-10-01 GB GB9120835A patent/GB2260149B/en not_active Expired - Fee Related
-
1992
- 1992-09-09 AU AU22852/92A patent/AU650602B2/en not_active Ceased
- 1992-09-09 ZA ZA926873A patent/ZA926873B/en unknown
- 1992-09-16 HU HU9202944A patent/HU9202944D0/en unknown
- 1992-09-16 CA CA002078417A patent/CA2078417A1/en not_active Abandoned
- 1992-09-22 CZ CS922900A patent/CZ279561B6/en not_active IP Right Cessation
- 1992-09-22 SK SK2900-92A patent/SK278861B6/en unknown
- 1992-09-30 FR FR9212073A patent/FR2681901A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CZ290092A3 (en) | 1993-05-12 |
| ZA926873B (en) | 1993-04-26 |
| SK278861B6 (en) | 1998-04-08 |
| GB2260149A (en) | 1993-04-07 |
| AU2285292A (en) | 1993-04-08 |
| CZ279561B6 (en) | 1995-05-17 |
| CA2078417A1 (en) | 1993-04-02 |
| SK290092A3 (en) | 1994-04-06 |
| GB2260149B (en) | 1995-07-26 |
| HU9202944D0 (en) | 1992-12-28 |
| FR2681901A1 (en) | 1993-04-02 |
| GB9120835D0 (en) | 1991-11-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |