CA2078417A1 - Carbide tip and pick - Google Patents
Carbide tip and pickInfo
- Publication number
- CA2078417A1 CA2078417A1 CA002078417A CA2078417A CA2078417A1 CA 2078417 A1 CA2078417 A1 CA 2078417A1 CA 002078417 A CA002078417 A CA 002078417A CA 2078417 A CA2078417 A CA 2078417A CA 2078417 A1 CA2078417 A1 CA 2078417A1
- Authority
- CA
- Canada
- Prior art keywords
- tip
- face
- apex
- tail portion
- extended tail
- 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
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
-
- 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
- E21C35/1837—Mining picks; Holders therefor with inserts or layers of wear-resisting material characterised by the shape
Abstract
ABSTRACT
CARBIDE TIP AND PICK
A carbide mineral cutting tip (5) comprises a solid carbide body having at least one front face (6); at least one top face (9); a bottom, seating face (12); a rear face (20);
and lateral, side faces (13), the tip (5) comprising a main tip portion (14) and an extended tail portion (15) the rear face (20) being provided at the end of the extended tail portion (15), whereby the front-to-rear length A to C of the tip (5) approximates to twice the depth of the tip (5) represented by the top-to-bottom length D to E of the front face (6), with two faces (10) converging to an apex (11) defining the top face (9) of the main tip portion (14) and with the top face of the tail portion (15) defined by another two faces (18) converging to a top apex (19) which is contiguous with the top apex (11) of the main tip portion (14) at an increased back clearance angle compared with that of the main tip portion (14). The invention also includes a pick (1) provided with such a tip (5).
CARBIDE TIP AND PICK
A carbide mineral cutting tip (5) comprises a solid carbide body having at least one front face (6); at least one top face (9); a bottom, seating face (12); a rear face (20);
and lateral, side faces (13), the tip (5) comprising a main tip portion (14) and an extended tail portion (15) the rear face (20) being provided at the end of the extended tail portion (15), whereby the front-to-rear length A to C of the tip (5) approximates to twice the depth of the tip (5) represented by the top-to-bottom length D to E of the front face (6), with two faces (10) converging to an apex (11) defining the top face (9) of the main tip portion (14) and with the top face of the tail portion (15) defined by another two faces (18) converging to a top apex (19) which is contiguous with the top apex (11) of the main tip portion (14) at an increased back clearance angle compared with that of the main tip portion (14). The invention also includes a pick (1) provided with such a tip (5).
Description
- 1 2078~7 CARBIDE TIP AND PICK
This lnvention 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 plcks), are established in extensive use, all being of steel, with a tip~receiving recess machined into the top, upper face of the head o 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 occured on a top edge of the tip, the steel of the pick head is exposed, and disadvantageously begins a rubbing action on the mineral bein~
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 incendive sparking 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 pick changing - typically after 3 - 4 shifts of coal mining is involved - requiring perhaps one hour down time to change a rotary cutting head having say 50 picks. Known tip/pick proposals include GB 1,085,757, EP 0103820, US
25 2,330,081, US 4,143,920, US 4,674,802, and US 5,092,310.
A basic object of the invention is to provide a ' ..... .
'' ' '":
~.
This lnvention 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 plcks), are established in extensive use, all being of steel, with a tip~receiving recess machined into the top, upper face of the head o 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 occured on a top edge of the tip, the steel of the pick head is exposed, and disadvantageously begins a rubbing action on the mineral bein~
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 incendive sparking 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 pick changing - typically after 3 - 4 shifts of coal mining is involved - requiring perhaps one hour down time to change a rotary cutting head having say 50 picks. Known tip/pick proposals include GB 1,085,757, EP 0103820, US
25 2,330,081, US 4,143,920, US 4,674,802, and US 5,092,310.
A basic object of the invention is to provide a ' ..... .
'' ' '":
~.
- 2 - 2~7~
carbide tip and mineral cutter pick of increased working life and dimlnished propensity for spark ignitions.
According to a first aspect o~ 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 lateral, side faces, the tip comprising a main tip portlon and an extended tail portion the rear face being provided at the end of the extended tail portion, whereby the front-to-rear length of the tip approximates to twice the depth of the tip represented by the top-to-bottom length of the front face, with two faces converging to an apex defining the top face of the main tip portion and with the top face of the tail portion defined by another two faces converging to a top apex which is contiguous with the top apex of the main tip portion at increased back clearance angle compared with that of the main tip portion.
According to a second aspect of the present invention, there is provided a mineral cutter pick incorporating a tip as defined above.
Tests have indicated that with the tip and pick in accordance with the invention at 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 50~. Apart from reduced costs resulting from the reduced number of picks required to mine the same tonnage of -~ mineral, added savings are provided by reducing down time by half for pick-changing operations.
. ~ `' ` - .
~7~17 Preferably, the front face of the tip is defined by two angled faces converglng to a front 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 of the main tip portion. 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 ~` 15 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 l~but illustrates a forward attack pick.
In both Figures, like components are accorded like reference numerals.
A mine:ral cutter pick 1 is of forged steel having a rectangular section shank 2 adapted to be 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 ... . :
, :
. 4 or underground roadway driving machine, e.g. a so-called roadheader. This shan~ 2 is lntegral with an enlarged head 3 which may be offset, as shown in Figure 1, to constitute an industry-standard radial pic~, 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 5.
The tip 5 has a front face 6 defined by two angled faces 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, is a main tip portlon 14, which alone may be considered as an industry-standard tip, and when wear has occurred with such a tip, only as far as llne Ll (Figure 1), disadvantageous steel-to-mineral contact will occur between the head 2 and the mineral involved. In accordance with a first feature of the invention, the tip 1 includes an extended tail portion 15 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 25 face 6 defined between lines D and E. The portions 14 and 15 are of course integrally produced during conventional carbide pressing and sintering operations.
The extended tail portion 15 has a bottom seating face , . . .
;
-' , . ,. , :, . . ,: ~
: - . .
2~7~17 16 contiguous with the face 12 of the main tip portion 15, and in accordance with a second feature of the invention 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 ` 5 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 ~ace 6 of the main tip portion 14 and leading, by a chamfered face 22, to the bottom seating face 16.
Tests have shown that with the tip 1 in accordance with the invention, comprisi`ng a main tip portion 14 and an extended tail portion 15 and increased back rake angle of apex 19, no di.sadvantageous steel-to-mineral contact occurs until wear reaches line L2 (Figure 1). With the tips 1 as .`: 15 illustrated, this means that some 50~ of the carbide tip 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: 50~
compared wlth picks provided with industry-standard forms of carbide tips; for a reduced number of pick changes and hence ,~
- reduced non-productlve labour costs and also reduced down time of the associated shearer or roadheader and hence increased production; for a reduced number of pick purchases for a mine operator; and for reduced underground transportation costs~.
:' . ~ .
. . . .
carbide tip and mineral cutter pick of increased working life and dimlnished propensity for spark ignitions.
According to a first aspect o~ 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 lateral, side faces, the tip comprising a main tip portlon and an extended tail portion the rear face being provided at the end of the extended tail portion, whereby the front-to-rear length of the tip approximates to twice the depth of the tip represented by the top-to-bottom length of the front face, with two faces converging to an apex defining the top face of the main tip portion and with the top face of the tail portion defined by another two faces converging to a top apex which is contiguous with the top apex of the main tip portion at increased back clearance angle compared with that of the main tip portion.
According to a second aspect of the present invention, there is provided a mineral cutter pick incorporating a tip as defined above.
Tests have indicated that with the tip and pick in accordance with the invention at 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 50~. Apart from reduced costs resulting from the reduced number of picks required to mine the same tonnage of -~ mineral, added savings are provided by reducing down time by half for pick-changing operations.
. ~ `' ` - .
~7~17 Preferably, the front face of the tip is defined by two angled faces converglng to a front 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 of the main tip portion. 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 ~` 15 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 l~but illustrates a forward attack pick.
In both Figures, like components are accorded like reference numerals.
A mine:ral cutter pick 1 is of forged steel having a rectangular section shank 2 adapted to be 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 ... . :
, :
. 4 or underground roadway driving machine, e.g. a so-called roadheader. This shan~ 2 is lntegral with an enlarged head 3 which may be offset, as shown in Figure 1, to constitute an industry-standard radial pic~, 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 5.
The tip 5 has a front face 6 defined by two angled faces 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, is a main tip portlon 14, which alone may be considered as an industry-standard tip, and when wear has occurred with such a tip, only as far as llne Ll (Figure 1), disadvantageous steel-to-mineral contact will occur between the head 2 and the mineral involved. In accordance with a first feature of the invention, the tip 1 includes an extended tail portion 15 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 25 face 6 defined between lines D and E. The portions 14 and 15 are of course integrally produced during conventional carbide pressing and sintering operations.
The extended tail portion 15 has a bottom seating face , . . .
;
-' , . ,. , :, . . ,: ~
: - . .
2~7~17 16 contiguous with the face 12 of the main tip portion 15, and in accordance with a second feature of the invention 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 ` 5 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 ~ace 6 of the main tip portion 14 and leading, by a chamfered face 22, to the bottom seating face 16.
Tests have shown that with the tip 1 in accordance with the invention, comprisi`ng a main tip portion 14 and an extended tail portion 15 and increased back rake angle of apex 19, no di.sadvantageous steel-to-mineral contact occurs until wear reaches line L2 (Figure 1). With the tips 1 as .`: 15 illustrated, this means that some 50~ of the carbide tip 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: 50~
compared wlth picks provided with industry-standard forms of carbide tips; for a reduced number of pick changes and hence ,~
- reduced non-productlve labour costs and also reduced down time of the associated shearer or roadheader and hence increased production; for a reduced number of pick purchases for a mine operator; and for reduced underground transportation costs~.
:' . ~ .
. . . .
Claims (6)
1. 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 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 portion, 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 face, with two faces converging to an apex defining the top face of the main tip portion, and another two faces converging to an apex to define a top face of said extended tail portion, said top apex of said extended tail portion being contiguous with said top apex of said main tip portion, and said top apex of said extended tail portion having an increased back clearance angle compared with that of said top apex of said main tip portion.
2. A tip as claimed in Claim 1, wherein said front face of said tip is defined by two angled faces converging to a front apex.
3. A tip as claimed in Claim 1, wherein said bottom seating face is planar.
4. 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.
5. A tip as claimed in Claim 1, wherein said rear face is defined by a first face parallel, or generally so, to said front face, and leading by a chamfered face to said bottom seating face.
6. A mineral cutting pick provided with a carbide 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 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 portion, 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 face, with two faces converging to an apex defining the top face of the main tip portion, and another two faces converging to an apex to define a top face of said extended tail portion, said top apex of said extended tail portion being contiguous with said top apex of said main tip portion, and said top apex of said extended tail portion having an increased back clearance angle compared with that of said top apex of said main tip portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9120835A GB2260149B (en) | 1991-10-01 | 1991-10-01 | Carbide tip and pick |
| GB9120835.5 | 1991-10-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2078417A1 true CA2078417A1 (en) | 1993-04-02 |
Family
ID=10702245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002078417A Abandoned CA2078417A1 (en) | 1991-10-01 | 1992-09-16 | 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 ZA ZA926873A patent/ZA926873B/en unknown
- 1992-09-09 AU AU22852/92A patent/AU650602B2/en not_active Ceased
- 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 |
|---|---|
| CZ279561B6 (en) | 1995-05-17 |
| FR2681901A1 (en) | 1993-04-02 |
| AU650602B2 (en) | 1994-06-23 |
| SK290092A3 (en) | 1994-04-06 |
| CZ290092A3 (en) | 1993-05-12 |
| GB9120835D0 (en) | 1991-11-13 |
| GB2260149B (en) | 1995-07-26 |
| ZA926873B (en) | 1993-04-26 |
| AU2285292A (en) | 1993-04-08 |
| SK278861B6 (en) | 1998-04-08 |
| GB2260149A (en) | 1993-04-07 |
| HU9202944D0 (en) | 1992-12-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |