GB2460354A - Stump grinding disk and wear strips therefore - Google Patents
Stump grinding disk and wear strips therefore Download PDFInfo
- Publication number
- GB2460354A GB2460354A GB0915014A GB0915014A GB2460354A GB 2460354 A GB2460354 A GB 2460354A GB 0915014 A GB0915014 A GB 0915014A GB 0915014 A GB0915014 A GB 0915014A GB 2460354 A GB2460354 A GB 2460354A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wear
- grinding disk
- stump grinding
- wear strip
- outer edge
- 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.)
- Granted
Links
- 239000002245 particle Substances 0.000 claims abstract description 20
- 239000011159 matrix material Substances 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 238000005520 cutting process Methods 0.000 claims abstract description 14
- 230000002093 peripheral effect Effects 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 239000000758 substrate Substances 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 description 5
- 238000003466 welding Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G23/00—Forestry
- A01G23/02—Transplanting, uprooting, felling or delimbing trees
- A01G23/06—Uprooting or pulling up trees; Extracting or eliminating stumps
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G23/00—Forestry
- A01G23/02—Transplanting, uprooting, felling or delimbing trees
- A01G23/06—Uprooting or pulling up trees; Extracting or eliminating stumps
- A01G23/067—Uprooting or pulling up trees; Extracting or eliminating stumps by comminuting the tree stumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
- B23D61/02—Circular saw blades
- B23D61/04—Circular saw blades with inserted saw teeth, i.e. the teeth being individually inserted
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Forests & Forestry (AREA)
- Environmental Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
A stump grinding disk comprises a metallic wheel12defining an axis of rotation R and includes a pair of side surfaces14and a circumferential outer edge surface16. The outer edge surface16includes a plurality of circumferentially spaced recesses32. Each recess32extends axially completely through the disk. A plurality of side cutting elements20are mounted on each side surface. A plurality of outer peripheral cutters22are spaced circumferentially apart around the outer edge surface16. Wear strips30are mounted in respective recesses32. Each wear strip30includes a metal matrix in which hard particles are disposed. Each wear strip 30 defines a radially inner surface (40) affixed to the wheel12, and a radially outer surface (42) arranged substantially flush with adjacent portions of the outer edge surface16. Each wear strip30may be convexly curved along a length of the wear strip, the length of the strip being greater than its width.
Description
STUMP GRINDING DISKAND WEAR STRIPS THEREFOR
(0001] The present invention relates to stump cutter disks which comprise a wheel on which cutting elements are mounted that grind-up stumps as the wheel is driven, and in particular to wear strips mounted on the wheel to minimize abrasive wear.
[00021 A stump grinding disc 100 disclosed in U.S. Patent No. 6,382,277, and depicted herein in Fig. 1, includes a metallic wheel 112 which defines an axis of rotation. The wheel has a pair of parallel side surfaces 114 intersected by the axis A, and an outer circumferentia! edge surface 116 defining a largest diameter of the disk. The side surfaces 114 are spaced axially apart by a distance which is much shorter than a maximum diameter of the disk. A plurality of side cutting elements 120 are mounted on each side surface, and a plurality of peripheral cutting elements 122 are mounted in recesses 124 formed in the circumferential edge surface 116.
[0003] Stump cutter disks experience wear on the outer circumferential edge surface 116 of the disk, especially in the case of larger disks turning at high rpm. As the disk is lowered into the ground to cut a root ball, the roots and surrounding ground and rocks wear on the edge surface. The disk material is quickly eroded and its diameter is reduced, requiring that the disk be repaired or replaced. Roth of those options are expensive and time consuming. To repair the disk hard face material in the form of weld wire or rod is deposited on the circumferential edge using a welding machine. That requires many man-hours, and the hard face material is expensive. The repair is temporary and must be replaced as the disk wears down again.
[0004] To replace the disk, it must be removed from the machine, and all of the cutters must be removed and re-attached to a new disk. Some machine designs require that the cutter shaft be removed in order to change the disk. That often requires that the shaft bearings be replaced, which is expensive.
f0005J One attempt made to extend the life of stump cutters involved manufacturing the disk from an abrasive resistant material or work-hardened steel. Those materials are expensive and are difficult to machine and penetrate in order to form holes for the cutters. Moreover, the wear resistance offered.by such disks is minimal and not very cost effective.
Therefore, it would be desirable to provide a more effective and economical way of minimizing the rate of wear of a disk's outer surface.
[0006] The present invention relates to a stump grinding disk which comprises a metallic wheel defining an axis of rotation and including a pair of side surfaces interconnected by the axis. A circumferential outer edge surface defines a largest diameter of the disk. The side surfaces are spaced axially apart by a distance substantially shorter than the maximum diameter.
The outer edge surface includes a plurality of circumferentially spaced recesses. Each recess extends axially completely through the disk from one side surface to the other side surface. A plurality of side cutting elements are mounted on each side surface. A plurality of outer peripheral cutters are spaced circumferentially apart around the outer edge surface. Wear strips are mounted in respective ones of the recesses between circumferentially adjacent outer peripheral cutters. Each wear strip includes a metal matrix in which hard particles are disposed. Each wear strip defines a radially inner surface affixed to the wheel, and a radially outer surface arranged substantially flush with adjacent portions of the outer edge surface.
Optional features of the invention are set out in the dependent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
(0007] The objects and advantages of the invention will become apparent from the following detailed description of preferred embodiments thereof in connection with the accompanying drawings in which like numerals designate like elements.
Fig. I is a fragmentary side elevational view of a prior art stump grinding disk.
Fig. 2 is a fragmentary side elevational view of a stump grinding disk according to the present invention.
Fig. 3 is a side elevationa! view of a wear strip according to the present invention.
Fig. 4 is a sectional view taken along the line 4-4 in Fig. 3.
Fig. 5 is a view similar to Fig. 4 of a second embodiment of the invention.
DESCRIPTION OF A PREFERRED EMBODIMENT
[0008] A stump grinding disk 10 according to the invention is depicted in Fig. 2. The disk includes a metallic wheel 12 which defines an axis of rotation. The wheel has a pair of side surfaces 14 intersected by the axis A, and an outer circumferential edge surface 16 defining a largest diameter of the disk. The side surfaces 14 are spaced axially apart by a distance which is much shorter than a maximum diameter of the disk.
[0009] A plurality of side cutting elements 20 are mounted on each side surface, and a plurality of peripheral cutting elements 22 are mounted in recesses 24 formed in the circumferential edge surface 16. Reference may be had to U.S, Patent Nos. 6,546,977 and 6,848,485 for a description of examples of suitable side cutting elements and peripheral cutting elements, although other types of side and peripheral cutting elements could be used if desired. The disclosures of those patents are incorporated by reference herein.
OO10] Alternating with the peripheral cutting elements 22 are wear strips according to the invention which are mounted in respective recesses 32 formed in the circumferential edge surface 16. The recess extends axially completely through the disk from one side surface 14 to the other. The recess 32 includes leading and trailing faces 34, 38 (considered with reference to the direction of disk rotation R) interconnected by a floor 38.
Each wear strip includes an inner surface 40 (see Fig. 3) attached to the wheel 12, and an outer wear surface 42.
100111 For example, as shown in Figs. 3 and 4, the wear strip 30 could include a metallic mounting substrate 45 formed of steel for example, and a wear layer 46 formed of a mixture of a powdered steel matrix in which crushed carbide, e.g., crushed cemented carbide particles 44 are dispersed.
The steel carbide mixture would be deposited onto the metallic substrate 45 and then the entire element would be forged and then immediately quenched.
(0012J Alternatively, a wear strip 30a could be formed by casting crushed cemented carbide particles 44 directly into an outer wear surface 42a of a steel or iron matrix 48 as shown in Fig. 5.
10013] The outer wear surface 42 or 42a is preferably convexly curved along a length L of the wear strip, i.e., between leading and trailing ends 50, 52 of the wear strip, wherein the radius of curvature of the wear surface is substantially equal to the radius of curvature of the circumferential edge surface 16. The inner surface 40 would be shaped in accordance with the shape of the floor 38 of the recess 32. Thus, the inner surface 40 could be flat or concavely curved1 for example. The length L is greater than a width W of the wear strip, and the width W is greater than a thickness T of the wear strip.
[00141 The wear strips are mounted in the recesses in any suitable fashion, but preferably by welding the metallic mounting substrate to the wheel, e.g., welding the wear strip to the floor 38 of the respective recess 32, with the wear surface arranged substantially flush with the adjacent portions of the circumferential edge surface 16 as depicted in Fig. 2. The total circui'yiferentjaj length of all of the wear surfaces of the wear strips (j.e,, L x no. of wear strips) exceeds the total circumferential length of the non-recessed portions 60 of the circumferential edge surface disposed ahead of, and behind, the wear strips, so that a majority of the outer edge surface is defined by the wear strips.
100151 During a stump cutting operation, the crushed cemented carbide 44 comes into contact with the ground and rocks, resisting wear and abrasion, and thereby extending the life of the disk, Once the wear strips have become excessively worn, they can be removed and replaced with fresh wear strips. Accordingly, the present invention enables the life of a stump cuthng disk to be considerably lengthened.
[0010] Although the present invention has been described in connection with a preferred embodiment thereof, it will be appreciated by those skilled in the art that additions, deletions, modifications, and substitutions not specifically described may be made without departing from the spirit and* scope of the invention as defined in the appended claims.
The following statements provide general expressions of the disclosure herein: A. A stump grinding disk comprising: a metallic wheel defining an axis of rotation and including a pair of side surfaces intersected by the axis, and a circumferential outer edge surface defining a largest diameter of the disk, the side surfaces spaced axially apart by a distance substantially shorter than the maximum diameter, the outer edge surface including a plurality of circumferentially spaced recesses, each recess extending axially completely through the disk from one side surface to the other side surface; a plurality of side cutting elements mounted on each side surface; a plurality of outer peripheral cutters spaced circumferentially apart around the outer edge surface; and wear strips mounted in respective ones of the recesses between circumferentially adjacent outer peripheral cutters, each wear strip including a metal matrix in which hard particles are disposed, each wear strip defining a radially inner surface affixed to the wheel, and a radially outer surface arranged substantially flush with adjacent portions of the outer edge surface.
B. The stump grinding disk according to statement A wherein the metal matrix is steel, and the hard particles comprise crushed cemented carbide.
C. The stump grinding disk according to statement A wherein the metal matrix is iron and the hard particles comprise crushed cemented carbide.
D. The stump grinding disk according to statement A wherein the metal matrix is powdered steel and the hard particles comprise crushed cemented carbide.
E. The stump grinding disk according to statement A wherein each wear strip comprises a steel substrate on which is disposed a layer of the metal matrix and hard particles, the steel substrate being welded to the wheel.
F. The stump grinding disk according to statement A wherein a total circumferential length of all of the wear surfaces exceeds a total circumferential length of the adjacent portions of the outer edge surface of the wheel.
G. The stump grinding disk according to statement A wherein the outer wear surface of each wear strip is convexly curved with a radius substantially equal to a radius of curvature of the outer edge surface.
H. A wear strip for use in a stump grinding wheel, comprising a metal matrix in which crushed hard particles are embedded; a wear surface of the wear strip being convexly curved along a length of the wear strip, the length being greater than a width of the wear strip; and the width being greater than a thickness of the wear strip.
The wear strip according to statement H, further comprising a metallic mounting substrate on which is adhered a wear layer forming the wear surface, the wear layer comprising a metallic matrix in which the hard particles are embedded.
J. The wear strip according to statement H comprising a metal layer in which the hard particles are embedded.
K. A stump grinding disk or a wear strip for use in a stump grinding wheel substantially as any one embodiment herein described with reference to the accompanying drawings.
Claims (11)
- WHAT IS CLAIMED IS: 1. A stump grinding disk comprising: a metallic wheel defining an axis of rotation and including a pair of side surfaces intersected by the axis, and a circumferential outer edge surface defining a largest diameter of the disk, the side surfaces spaced axially apart by a distance substantially shorter than the maximum diameter, the outer edge surface including a plurality of circumferentially spaced recesses, each recess extending axially completely through the disk from one side surface to the other side surface; a plurality of side cutting elements mounted on each side surface; a plurality of outer peripheral cutters spaced circumferentially apart around the outer edge surface; and wear strips mounted in respective ones of the recesses between circumferentially adjacent outer peripheral cutters, each wear strip including a metal matrix in which hard particles are disposed, each wear strip defining a radially inner surface affixed to the wheel, and a radially outer surface arranged substantially flush with adjacent portions of the outer edge surface.
- 2. The stump grinding disk according to claim I wherein the metal matrix is steel, and the hard particles comprise crushed cemented carbide.
- 3. The stump grinding disk according to claim I wherein the metal matrix is iron and the hard particles comprise crushed cemented carbide.
- 4. The stump grinding disk according to claim 1 wherein the metal matrix is powdered steel and the hard particles comprise crushed cemented carbide.
- 5. The stump grinding disk according to claim 1 wherein each wear strip comprises a steel substrate on which is disposed a layer of the metal matrix and hard particles, the steel substrate being welded to the wheel.
- 6. The stump grinding disk according to claim 1 wherein a total circumferential length of all of the wear surfaces exceeds a total circumferential length of the adjacent portions of the outer edge surface of the wheel.
- 7. The stump grinding disk according to claim 1 wherein the outer wear surface of each wear strip is convexly curved with a radius substantially equal to a radius of curvature of the outer edge surface.
- 8. The stump grinding disk according to claim 1 wherein each wear strip comprises a metal matrix in which crushed hard particles are embedded; a wear surface of the wear strip being convexly curved along a length of the wear strip, the length being greater than a width of the wear strip; and the width being greater than a thickness of the wear strip.
- 9. The stump grinding disk according to claim 8 wherein each wear strip further comprises a metallic mounting substrate on which is adhered a wear layer forming the wear surface, the wear layer comprising a metallic matrix in which the hard particles are embedded.
- 10. The stump grinding disk according to claim 8 wherein each wear strip comprises a metal layer in which the hard particles are embedded.
- 11. A stump grinding disk substantially as any one embodiment herein described with reference to the accompanying drawings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/199,264 US7100651B1 (en) | 2005-08-09 | 2005-08-09 | Stump grinding disk and wear strips therefor |
| GB0608488A GB2428956B (en) | 2005-08-09 | 2006-04-28 | Wear strips for a stump grinding disk |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0915014D0 GB0915014D0 (en) | 2009-09-30 |
| GB2460354A true GB2460354A (en) | 2009-12-02 |
| GB2460354B GB2460354B (en) | 2010-05-26 |
Family
ID=41262186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0915014A Expired - Fee Related GB2460354B (en) | 2005-08-09 | 2009-08-27 | Stump grinding disk |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2460354B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4531349A (en) * | 1984-03-23 | 1985-07-30 | Sperry Corporation | Rotary cutter for disc mower-conditioner |
| US5261170A (en) * | 1990-04-06 | 1993-11-16 | Milard (Hard Metals) Limited | Wear strips |
| US5497815A (en) * | 1994-09-15 | 1996-03-12 | Bowling; John M. | Cutting tooth |
| US6546977B1 (en) * | 2002-01-29 | 2003-04-15 | Sandvik Rock Tools, Inc. | Stump grinding apparatus |
-
2009
- 2009-08-27 GB GB0915014A patent/GB2460354B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4531349A (en) * | 1984-03-23 | 1985-07-30 | Sperry Corporation | Rotary cutter for disc mower-conditioner |
| US5261170A (en) * | 1990-04-06 | 1993-11-16 | Milard (Hard Metals) Limited | Wear strips |
| US5497815A (en) * | 1994-09-15 | 1996-03-12 | Bowling; John M. | Cutting tooth |
| US6546977B1 (en) * | 2002-01-29 | 2003-04-15 | Sandvik Rock Tools, Inc. | Stump grinding apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2460354B (en) | 2010-05-26 |
| GB0915014D0 (en) | 2009-09-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20140428 |