| WO/2000/043636 | MOUNTING OF A ROTATABLE CHISEL IN MINING MACHINERY |
| JP07301075 | PERFORATION TOOL |
| WO/2002/086289 | ROTATABLE CUTTING TOOL WITH ISOLATED RETAINER STOP |
MONYAK, Kenneth (17270 Mary Lee Drive, Abingdon, VA, 24210, US)
MOUTHAAN, Daniel (7043 Deep Water Point, Williamsburg, MI, 49690, US)
FADER, Joseph (135 Smartview Lane, Abingdon, VA, 24210, US)
MONYAK, Kenneth (17270 Mary Lee Drive, Abingdon, VA, 24210, US)
MOUTHAAN, Daniel (7043 Deep Water Point, Williamsburg, MI, 49690, US)
CLAIMS
What is claimed is:
1. A breaking or excavating tool (2) comprising a body (4) having a mounting end (6) and a working end (8), a seating surface (12) at the working end (8) including a cavity (14) and axially projecting sidewalls (16) formed integral to the body (4), an insert (20) mounted within the cavity (14) having a tip (22) at an axially forwardmost end (24), a tapered forward surface (26), a side surface (28) and a transition edge (30) at an intersection of the forward surface (26) and the side surface (28), and a ring (40) located radially outward of the projecting sidewalls (16), the ring (40) formed of a material harder than the body (4) of the tool (2), characterized in that the transition edge (30) and an axially forwardmost surface (18, 42) of each of the sidewalls (16) and the ring (40) are arranged in an axially rearwardly extending stepped configuration.
2. The tool according to claim 1 , characterized in that an axially rearwardmost surface (60) of the insert (20) is at an axial distance L from the tip (22) of the insert (20) and the axially forwardmost surface (42) of the ring (40) is at an axial distance D from the tip (22) of the insert (20), where 0.5L < D < 0.9L, preferably 0.5L < D < 0.8L.
3. The tool according to claim 2, characterized in that an axially rearwardmost surface (56) of the ring (40) is at an axial distance d from the tip (22) of the insert (20), where d is greater than D and d is less than L and that the ring (40) is the radially outermost portion of the tool (2) in the interval D to d.
4. The tool according to claim 3, characterized in that 0.5L < D < 0.8L and d < 0.9L.
5. The tool as in any one of claims 1-4, characterized in that a radial thickness of the sidewalls (16) is maximally I 3 , a radial thickness of the ring (40) is maximally l r , and Ir is greater than or equal to I 3 .
6. The tool as in any one of claims 1-5, characterized in that the transition edge (30) and a radially outermost portion (50, 52) of the axially forwardmost surface (18, 42) of each of the sidewalls (16) and the ring (40) are arranged on a ballistic envelop (54) of the tool (2).
7. The tool according to claim 6, characterized in that the ballistic envelop (54) forms an angle (α) of about 60 degrees or less.
8. The tool as in any one of claims 1-7, characterized in that the insert (20) is mounted in the cavity (12) with a full braze.
9. A material removal machine comprising a rotatable member, characterized in that one or more tools (2) as in any one of claims 1 -8 is mounted on the rotatable member.
10. The material removal machine according to claim 9, characterized in that the material removal machine is an underground mining machine, a surface mining machine, a road planning machine, a trencher or a reclaiming machine.
11. A method of manufacturing a breaking or excavating tool (2) comprising forming a first seating surface (12) at a working end (8) of a body (4) of the tool (2), the seating surface (12) including a cavity (14) and axially projecting sidewalls (16) formed integral to the body (4), forming a second seating surface (44) radially outward of the cavity (14) of the first seating surface (12), mounting an insert (20) to the first seating surface (12), the insert (20) including a tip (22) at an axially forwardmost end (24), a tapered forward surface (26), a side surface (28) and a transition edge (30) at an intersection of the forward surface (26) and the side surface (28), and mounting a ring (40) to the second seating surface (44), wherein the mounted ring (40) is located radially outward of the projecting sidewalls (16) and wherein the ring (40) is formed of a material harder than the body (4) of the tool (2), characterized in that the transition edge (30) and an axially forwardmost surface (18, 42) of each of the sidewalls (16) and the ring (40) are arranged in an axially rearwardly extending stepped configuration.
12. The method according to claim 11 , characterized in that at least one of mounting the insert (20) and mounting the ring (40) includes a full braze.
13. The method according to claim 11 or 12, characterized in that the transition edge (30) and a radially outermost portion (50, 52) of the axially forwardmost surface (18, 42) of each of the sidewalls (16) and the ring (40) are arranged on a ballistic envelop of the tool (2).
14. The method as in anyone of claims 11-13, characterized in that an axially rearwardmost surface (60) of the insert (20) is at an axial distance L from the tip (22) of the insert (20) and the axially forwardmost surface (42) of the ring (40) is at an axial distance D from the tip (22) of the insert (20), where 0.5L < D < 0.9L, preferably 0.5L < D ≤ O.βL
15. The method of according to claim 14, characterized in that an axially rearwardmost surface (56) of the ring (40) is at an axial distance d from the tip (22) of the insert (20), where d is greater than D and d is less than L and that the ring (40) is the radially outermost portion of the tool (2) in the interval D to d. |
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
FIELD
[0001] The present disclosure relates to a breaking or excavating tool. In particular, the present disclosure relates to a breaking or excavating tool with a working end having a cemented carbide insert, a seat for the insert having projecting sidewalls and a ring of material harder than the body of the tool located radially outward of the projecting sidewalls, where the insert, the sidewalls and the ring are arranged in a rearwardly extending stepped configuration.
BACKGROUND
[0002] In the discussion of the background that follows, reference is made to certain structures and/or methods. However, the following references should not be construed as an admission that these structures and/or methods constitute prior art. Applicant
expressly reserves the right to demonstrate that such structures and/or methods do not qualify as prior art.
[0003] Tools for breaking or excavating with working inserts of hard metal have been produced in configurations which have a lower energy consumption for a given operating capability. Although the front tip of the insert is intended to provide the cutting or breaking action in these low energy tools, if the body exposed to impact or abrasion during operation of the tool is made of a softer material, the body is subject to wear and damage. One result of this wear and damage is to weaken the attachment of the insert. The tool then fails prematurely because the insert has been dislodged. [0004] Currently there is no pick of this fashion suitable for hard cutting conditions (e.g. tunneling, trenching, etc.). Caps offer steel wash protection but do not tend to stay on their steel bodies in tough conditions. In one known tool, a ring is located on the front face of the body. However, the axial location of the ring over the insert makes penetration difficult because of the blunting of the tip. Blunt picks produce excessive dust, consume too much energy, produce more heat, and create extreme vibration. [0005] There is a need for a breaking or excavating tool that would give the benefits of a cap and the holding power of an insert and be suitable for the toughest conditions while extending the life of the tool. In addition, blunting of the tool should be minimized for improved performance.
SUMMARY
[0006] An exemplary breaking or excavating tool comprises a body having a mounting end and a working end, a seating surface at the working end including a cavity and axially projecting sidewalls formed integral to the body, an insert mounted within the cavity having a tip at an axially forwardmost end, a tapered forward surface, a side surface and a transition edge at an intersection of the forward surface and the side surface, and a ring located radially outward of the projecting sidewalls, the ring formed of a material harder than the body of the tool, wherein the transition edge and
an axially forwardmost surface of each of the sidewalls and the ring are arranged in an axially rearwardly extending stepped configuration.
[0007] An exemplary material removal machine comprises a rotatable member and one or more breaking or excavating tools mounted on the rotatable member, wherein the breaking or excavating tool, includes: a body having a mounting end and a working end, a seating surface at the working end including a cavity and axially projecting sidewalls formed integral to the body, an insert mounted within the cavity having a tip at an axially forwardmost end, a tapered forward surface, a side surface and a transition edge at an intersection of the forward surface and the side surface, and a ring located radially outward of the projecting sidewalls, the ring formed of a material harder than the body of the tool, wherein the transition edge and an axially forwardmost surface of each of the sidewalls and the ring are arranged in an axially rearwardly extending stepped configuration.
[0008] An exemplary method of manufacturing a breaking or excavating tool comprises forming a first seating surface at a working end of a body of the tool, the seating surface including a cavity and axially projecting sidewalls formed integral to the body; forming a second seating surface radially outward of the cavity of the first seating surface; mounting an insert to the first seating surface, the insert including a tip at an axially forwardmost end, a tapered forward surface, a side surface and a transition edge at an intersection of the forward surface and the side surface; and mounting a ring to the second seating surface, wherein the mounted ring is located radially outward of the projecting sidewalls and wherein the ring is formed of a material harder than the body of the tool, wherein the transition edge and an axially forwardmost surface of each of the sidewalls and the ring are arranged in an axially rearwardly extending stepped configuration.
[0009] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
BRIEF DESCRIPTION OF THE DRAWING
[0010] The following detailed description can be read in connection with the accompanying drawings in which like numerals designate like elements and in which:
[0011] FIG. 1 shows a cross-sectional view of an exemplary embodiment of a breaking or excavating tool.
[0012] FIG. 2 shows a cross-sectional view of the breaking or excavating tool of
FIG. 1 showing select components in an unassembled state.
[0013] FIG. 3 shows a magnified cross-sectional view of the working end of the breaking or excavating tool of FIG. 1.
[0014] FIG. 4 shows a side view of an exemplary embodiment of the working end of a breaking or excavating tool.
DETAILED DESCRIPTION
[0015] Exemplary embodiments of breaking and excavating tools have an insert at a working end and a mounting means, such as retainer sleeve or a retainer clip, at a mounting end. Inserts are formed of hard material, an example of which is cemented carbide.
[0016] FIG. 1 shows a cross-sectional view of an exemplary embodiment of a breaking or excavating tool. The exemplary breaking or excavating tool 2 comprises a body 4 having a mounting end 6 and a working end 8 arranged longitudinally along axis 10. A seating surface 12 is located at the working end 8. The seating surface 12 includes a cavity 14 and axially projecting sidewalls 16. The sidewalls 16 are formed integral to the body 4 by suitable means, such as by machining or a combination of rough forming, by, for example, casting or forging, and machining. The sidewalls 16 have a front surface 18 that is substantially perpendicular to the axis 10. [0017] An insert 20 is mounted within the cavity 12. An exemplary embodiment of an insert 20 has a tip 22 at an axially forwardmost end 24, a tapered forward surface
26, a side surface 28 and a transition edge 30 at an intersection of the forward surface 26 and the side surface 28.
[0018] A ring 40 is located radially outward of the projecting sidewalls 16. The ring 40 is the outermost radial feature at that longitudinal location along the axis 10 in that there is no portion of the body 4 that is radially outward from the outer diameter of the ring 40. An exemplary embodiment of a ring 40 has a front surface 42 that is substantially perpendicular to the axis 10. An exemplary embodiment of a ring 40 is formed of a material harder than the material forming the body of the tool, i.e., harder than the steel of body 4 and more particularly, harder than the material forming the projecting sidewalls 16.
[0019] Various components of the breaking and excavating tool 2, such as the seating surface 12, the cavity 14 and axially projecting sidewalls 16, are more clearly seen in FIG. 2, which shows a cross-sectional view of the breaking or excavating tool 2 of FIG. 1 in an unassembled state. Also shown in FIG. 2 is the seating surface 44 for the ring 40. As seen in FIG. 2, the seating surfaces 12 are a continuous cavity which provides enhanced support for the insert 20 against lateral forces perpendicular to the axis 10. Additionally, a continuous cavity provides beneficial flow of braze material during mounting of the insert 20.
[0020] Exemplary embodiments of the breaking or excavating tool can be included in a material removal machine. Examples of material removal machines include machines for underground mining, surface mining, trenching, road planning and/or reclaiming. For example, a material removal machine comprises a rotatable member and one or more breaking or excavating tools mounted on the rotatable member. The arrangement of the insert 20, the sidewalls 16 and the ring 40 are such that material removed by breaking or excavating activity employing the tool 2 is preferentially carried away and to the sides of the tool 2. Under such conditions, the removed material can wear the surfaces of the tool. To promote extended life of the disclosed tool 2, the transition edge 30 and an axially forwardmost surface 18, 42 of each of the sidewalls
16 and the ring 40 are arranged in an axially rearwardly extending stepped configuration. In use, removed material will collect on the surfaces of the stepped configuration, such as forwardmost surface 18 of the sidewall 16 and forwardmost surface 42 of the ring. As more material is removed, this collected material is subject to wear and less of the surfaces of the working end 8 are subject to wear. [0021] FIG. 3 shows a magnified cross-sectional view of the working end of the breaking or excavating tool of FIG. 1 and illustrates this stepped configuration. However, the profile of the stepped configuration is still within the ballistic envelop of the tool 2. For example, the transition edge 30, a radially outermost portion 50 of the axially forwardmost surface 18 of the sidewall 16 and a radially outermost portion 52 of the axially forwardmost surface 42 of the ring 40 are arranged on a ballistic envelop 54 of the tool 2. In exemplary embodiments, the ballistic envelop forms an angle α of about 60 degrees or less, alternatively 45 degrees to 60 degrees. [0022] FIG. 3 also illustrates exemplary embodiments of the relative axial positions of the insert 20 and the ring 40 and the relative radial positions and thicknesses of the insert 20, the sidewalls 16 and the ring 40.
[0023] For example and in regard to the relative axial positions of the insert 20 and the ring 40, an axially rearwardmost surface 30 of the insert 20 is at an axial distance L from the tip 22 of the insert 20 and the axially forwardmost surface 42 of the ring 40 is at an axial distance D from the tip 22 of the insert 20. Exemplary embodiments maintain the relative axial positions of these features such that D is equal to or between 0.5L and 0.9L (i.e., 0.5L < D < 0.9L), alternatively equal to or between 0.5L and 0.8L (i.e., 0.5L < D < 0.8L), alternatively equal to or between 0.6L and 0.8L (i.e., 0.6L < D < 0.8L). Furthermore, an axially rearwardmost surface 56 of the ring 40 is at an axial distance d from the tip 22 of the insert 20, and the relative axial positions of these features are such that d is greater than D and d is less than L, alternatively d < 0.9L, alternatively d < 0.75L. For example, in one exemplary embodiment, 0.5L < D < 0.8L and d < 0.9L. The relative axial positions of the insert 20 and the ring 40 improve the
seating of the insert 20 and provide improved support against forces applied to the insert during use.
[0024] As previously, noted, the ring 40 is the outermost radial feature at that longitudinal location along the axis 10 in that there is no portion of the body 4 that is radially outward from the outer diameter of the ring 40. Thus, in the interval D to d, the ring 40 is the radially outermost portion of the tool 2. As shown in FIG. 3, the ring 40 is entirely within the axial extent of the insert such that the axially rearwardmost surface 30 of the insert 20 extends axially rearward past the ring 40 and another portion of the insert 20 extends axially forward past the axially forwardmost surface 42 of the ring 40. [0025] In another example and in regard to the relative radial positions and thicknesses of the insert 20, the sidewalls 16 and the ring 40, a radial thickness of the sidewalls 16 is maximally I 3 and a radial thickness of the ring 40 is maximally l r . Exemplary embodiments maintain the relative radial positions and thicknesses of these features such that l r is greater than or equal to l s (i.e., l r ≥ U)- The thickness l s of the sidewall 16 is sufficient, without the ring 40, to allow continued use of the breaking or excavating tool 2. Thus, if the ring is lost or otherwise is removed by, for example, fracture or wear, the insert 20 has sufficient support from the sidewalls 16 to continue cutting operations. As an example of a radial thickness of the sidewalls 16, an exemplary thickness is 1 mm < I 3 < 4 mm.
[0026] FIG. 4 shows a side view of an exemplary embodiment of the working end 8 of a breaking or excavating tool 2.
[0027] The exemplary breaking or excavating tool can be manufactured by any suitable technique. In one exemplary method of manufacturing, the method comprises forming a first seating surface at a working end of a body of the tool, the seating surface including a cavity and axially projecting sidewalls formed integral to the body, and forming a second seating surface radially outward of the cavity of the first seating surface. The forming of the first and second seating surface can be by machining or a combination of rough forming, by, for example, casting or forging, and machining.
[0028] The method of manufacturing also comprises mounting an insert to the first seating surface, and mounting a ring to the second seating surface. The mounted ring is located radially outward of the projecting sidewalls and the transition edge and an axially forwardmost surface of each of the sidewalls and the ring are arranged in an axially rearwardly extending stepped configuration. In exemplary embodiments, at least one of mounting the insert and mounting the ring includes a full braze at the intersection of the insert and/or ring and the respective seating surface. [0029] The components and features of the disclosed breaking or excavating tool provide enhanced performance over conventional designs including reduced drag, easier penetration, less production of dust, reduced energy consumption, lower heat production, and minimized vibration.
[0030] Althoughv described in connection with preferred embodiments thereof, it will be appreciated by those skilled in the art that additions, deletions, modifications, and substitutions not specifically described may be made without department from the spirit and scope of the invention as defined in the appended claims.
[0031] The disclosures in the US provisional patent application No. 60/996,788 and the US provisional patent application No. 61/064,075, from which this application claims priority, are incorporated herein by reference.