CN104047548A - Diamond drill tooth with cobalt content gradient - Google Patents
Diamond drill tooth with cobalt content gradient Download PDFInfo
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- CN104047548A CN104047548A CN201310079693.3A CN201310079693A CN104047548A CN 104047548 A CN104047548 A CN 104047548A CN 201310079693 A CN201310079693 A CN 201310079693A CN 104047548 A CN104047548 A CN 104047548A
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Abstract
The invention discloses a diamond drill tooth with cobalt content gradient. The diamond drill tooth comprises a matrix and a polycrystalline diamond layer composited with the matrix, wherein the matrix comprises at least two layers of hard alloy matrixes with cobalt content in gradient distribution; the end faces of the hard alloy matrixes are adjacent to the polycrystalline diamond layer. By adopting the scheme, since the cobalt content from the polycrystalline diamond layer to the hard alloy matrixes is in uniform-gradient-changing distribution, internal stress of bonding interfaces between the polycrystalline diamond layer and the hard alloy matrixes is lowered through the design, the internal stress inside the hard alloy matrixes is lowered, the internal stress of the whole diamond drill tooth is lowered, and the impact resistance of the diamond drill tooth is improved.
Description
Technical field
The present invention relates to a kind of diamond drill machine tooth, relate in particular to a kind of diamond drill machine tooth with cobalt content gradient.
Background technology
Diamond drill machine tooth is by polycrystalline diamond layer and carbide by sintering process, to be formed under the high pressure high temperature condition of 5.5-7.5GPa and 1450-1550 ℃, have diamond high rigidity and abrasion resistance concurrently, carbide alloy high impact resistance, is widely used in oil, natural gas drill bit.
During work, diamond drill machine tooth is exposed to the most external of drill bit, directly acts on hard rock stratum, and fragmentation is carried out in rock stratum, and condition of work is very severe, is not only subject to strong corrasion, also will bear huge impact force simultaneously.Huge impact force can make diamond drill machine tooth Local Damaged come off, and even makes polycrystalline diamond separated or all separated with the carbide alloy part with its combination, and this will cause whole diamond bit premature failure.Hard alloy substrate in existing diamond drill machine tooth is single structure, its cobalt content is certain value, be not generally 13%, 14%, 16%, 18% not etc., and the cobalt content of compound polycrystalline diamond layer is generally 5% ~ 10% on this hard alloy substrate, cobalt content differs greatly between the two, cause bonding surface to have larger internal stress, the shock resistance of diamond drill machine tooth is declined, and then the application life of having reduced diamond bit.In manufacturing diamond bit process, whole diamond drill machine tooth need be welded on drill body under 700 ℃ of high temperature, because superposed polycrystalline diamond layer is with to be positioned at bottom different as the hard alloy substrate of substrate coefficient of thermal expansion separately, now the cobalt content in upper and lower layer plays an important role to thermal expansion performance separately, both cobalt content difference are larger, more easily produce larger internal stress, serious meeting makes polycrystalline diamond layer cracking, and whole diamond drill machine tooth was lost efficacy.
Summary of the invention
Object of the present invention is just to provide a kind of diamond drill machine tooth with cobalt content gradient, it can reduce internal stress that in diamond drill machine tooth, between polycrystalline diamond layer and hard alloy substrate, combination interface is remaining and the internal stress in hard alloy substrate, and the shock resistance of diamond drill machine tooth is improved.
For achieving the above object, the present invention is by the following technical solutions:
The present invention includes matrix and the polycrystalline diamond layer mutually compound with it, described matrix is at least the hard alloy substrate that two-layer cobalt content gradient distributes, and an end face and the polycrystalline diamond layer of described hard alloy substrate are adjacent.
Described matrix is three layers of hard alloy substrate I, hard alloy substrate II and hard alloy substrate III, one end face and the polycrystalline diamond layer of described hard alloy substrate I are adjacent, one end face of the other end of described hard alloy substrate I and hard alloy substrate II is adjacent, one end face of the other end of described hard alloy substrate II and hard alloy substrate III is adjacent, described hard alloy substrate I, hard alloy substrate II and hard alloy substrate III are comprised of tungsten carbide and metallic cobalt, the content distribution gradient of metallic cobalt and increasing successively.
In described hard alloy substrate I, the content of metallic cobalt is 6～10%, and in described hard alloy substrate II, the content of metallic cobalt is 10～14%, and in described hard alloy substrate III, the content of metallic cobalt is 14～18%.
Described matrix is hard alloy substrate I, hard alloy substrate II, four layers of hard alloy substrate III and hard alloy substrate IV, one end face and the polycrystalline diamond layer of described hard alloy substrate I are adjacent, one end face of the other end of described hard alloy substrate I and hard alloy substrate II is adjacent, one end face of the other end of described hard alloy substrate II and hard alloy substrate III is adjacent, one end face of the other end of described hard alloy substrate III and described hard alloy substrate IV is adjacent, described hard alloy substrate I, hard alloy substrate II, hard alloy substrate III and hard alloy substrate IV are comprised of tungsten carbide and metallic cobalt, the content distribution gradient of metallic cobalt and increasing successively.
In described hard alloy substrate I, the content of metallic cobalt is 6～10%, in described hard alloy substrate II, the content of metallic cobalt is 9～11%, in described hard alloy substrate III, the content of metallic cobalt is 10～14%, and in described hard alloy substrate IV, the content of metallic cobalt is 14～18%.
Described polycrystalline diamond layer is comprised of diamond crystals and metallic cobalt, and the content of described diamond crystals is 90～95%, and the content of described metallic cobalt is 5～10%.
The interface that one end face of described hard alloy substrate combines with polycrystalline diamond layer is plane.
The combination interface of described hard alloy substrate and polycrystalline diamond layer is the curved surface matching.
Combination interface between described hard alloy substrate is plane.
Combination interface between described hard alloy substrate is the curved surface matching.
Compared with prior art, adopt the present invention of such scheme to have following features: because the cobalt content during diamond drill machine tooth is from polycrystalline diamond layer to hard alloy substrate is the distribution that uniform gradient changes, therefore, this kind of design reduced the internal stress of combination interface between polycrystalline diamond layer and hard alloy substrate, reduced the internal stress of hard alloy substrate inside, reduce the internal stress of whole diamond drill machine tooth, improved the shock resistance of diamond drill machine tooth.
Accompanying drawing explanation
Fig. 1 is that matrix described in the present invention is the structural representation of three layers.
Fig. 2 is that matrix described in the present invention is the structural representation of four layers.
The specific embodiment
In order to make those skilled in the art person better understand technical scheme of the present invention, below in conjunction with accompanying drawing, technical scheme of the present invention is carried out to clear, complete description, obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiment.Embodiment based in the present invention, those skilled in the art, not making the every other embodiment obtaining under creative work prerequisite, should belong to the scope of protection of the invention.
Embodiment 1
As shown in Figure 1, the present invention includes matrix and with its mutually compound polycrystalline diamond layer 1, described matrix is 4 three layers of hard alloy substrate I 2, hard alloy substrate II 3 and hard alloy substrate III; One end face of described hard alloy substrate I 2 is adjacent with polycrystalline diamond layer 1, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate I 2 and hard alloy substrate II 3 is adjacent, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate II 3 and hard alloy substrate III 4 is adjacent, and the interface combining is to each other plane; Described hard alloy substrate I 2, hard alloy substrate II 3 and hard alloy substrate III 4 are comprised of tungsten carbide and metallic cobalt, the content distribution gradient of metallic cobalt, and increase successively; The cobalt content of described hard alloy substrate I 2 is 6%, and the cobalt content of described hard alloy substrate II 3 is 10%, and the cobalt content of described hard alloy substrate III 4 is 14%; Described polycrystalline diamond layer 1 is comprised of diamond crystals and metallic cobalt, and the content of diamond crystals is 95%, and the content of metallic cobalt is 5%.
One end face of described hard alloy substrate I 2 is adjacent with polycrystalline diamond layer 1, and the interface combining to each other also can be curved surface, as the straight trough shape curved surface matching; One end face of the other end of described hard alloy substrate I 2 and hard alloy substrate II 3 is adjacent, and the interface combining to each other also can be curved surface, as the sinusoidal curved surface matching; One end face of the other end of described hard alloy substrate II 3 and hard alloy substrate III 4 is adjacent, and the interface combining to each other also can be curved surface, as the zigzag curved surface matching.This kind of design is also applicable to the embodiment of introducing below.
Embodiment 2
As shown in Figure 1, the present invention includes matrix and with its mutually compound polycrystalline diamond layer 1, described matrix is 4 three layers of hard alloy substrate I 2, hard alloy substrate II 3 and hard alloy substrate III; One end face of described hard alloy substrate I 2 is adjacent with polycrystalline diamond layer 1, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate I 2 and hard alloy substrate II 3 is adjacent, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate II 3 and hard alloy substrate III 4 is adjacent, and the interface combining is to each other plane; Described hard alloy substrate I 2, hard alloy substrate II 3 and hard alloy substrate III 4 are comprised of tungsten carbide and metallic cobalt, the content distribution gradient of metallic cobalt, and increase successively; In described hard alloy substrate I 2, the content of metallic cobalt is 7%, and in described hard alloy substrate II 3, the content of metallic cobalt is 11%, and in described hard alloy substrate III 4, the content of metallic cobalt is 15%; Described polycrystalline diamond layer 1 is comprised of diamond crystals and metallic cobalt, and the content of diamond crystals is 94%, and the content of metallic cobalt is 6%.
Embodiment 3
As shown in Figure 1, the present invention includes matrix and with its mutually compound polycrystalline diamond layer 1, described matrix is 4 three layers of hard alloy substrate I 2, hard alloy substrate II 3 and hard alloy substrate III; One end face of described hard alloy substrate I 2 is adjacent with polycrystalline diamond layer 1, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate I 2 and hard alloy substrate II 3 is adjacent, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate II 3 and hard alloy substrate III 4 is adjacent, and the interface combining is to each other plane; Described hard alloy substrate I 2, hard alloy substrate II 3 and hard alloy substrate III 4 are comprised of tungsten carbide and metallic cobalt, the content distribution gradient of metallic cobalt, and increase successively; In described hard alloy substrate I 2, the content of metallic cobalt is 8%, and in described hard alloy substrate II 3, the content of metallic cobalt is 12%, and in described hard alloy substrate III 4, the content of metallic cobalt is 16%; Described polycrystalline diamond layer 1 is comprised of diamond crystals and metallic cobalt, and the content of diamond crystals is 93%, and the content of metallic cobalt is 7%.
Embodiment 4
As shown in Figure 1, the present invention includes matrix and with its mutually compound polycrystalline diamond layer 1, described matrix is 4 three layers of hard alloy substrate I 2, hard alloy substrate II 3 and hard alloy substrate III; One end face of described hard alloy substrate I 2 is adjacent with polycrystalline diamond layer 1, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate I 2 and hard alloy substrate II 3 is adjacent, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate II 3 and hard alloy substrate III 4 is adjacent, and the interface combining is to each other plane; Described hard alloy substrate I 2, hard alloy substrate II 3 and hard alloy substrate III 4 are comprised of tungsten carbide and metallic cobalt, the content distribution gradient of metallic cobalt, and increase successively; In described hard alloy substrate I 2, the content of metallic cobalt is 9%, and in described hard alloy substrate II 3, the content of metallic cobalt is 13%, and in described hard alloy substrate III 4, the content of metallic cobalt is 17%; Described polycrystalline diamond layer 1 is comprised of diamond crystals and metallic cobalt, and the content of diamond crystals is 92%, and the content of metallic cobalt is 8%.
Embodiment 5
As shown in Figure 1, the present invention includes matrix and with its mutually compound polycrystalline diamond layer 1, described matrix is 4 three layers of hard alloy substrate I 2, hard alloy substrate II 3 and hard alloy substrate III; One end face of described hard alloy substrate I 2 is adjacent with polycrystalline diamond layer 1, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate I 2 and hard alloy substrate II 3 is adjacent, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate II 3 and hard alloy substrate III 4 is adjacent, and the interface combining is to each other plane; Described hard alloy substrate I 2, hard alloy substrate II 3 and hard alloy substrate III 4 are comprised of tungsten carbide and metallic cobalt, the content distribution gradient of metallic cobalt, and increase successively; In described hard alloy substrate I 2, the content of metallic cobalt is 10%, and in described hard alloy substrate II 3, the content of metallic cobalt is 14%, and in described hard alloy substrate III 4, the content of metallic cobalt is 18%; Described polycrystalline diamond layer 1 is comprised of diamond crystals and metallic cobalt, and the content of diamond crystals is 91%, and the content of metallic cobalt is 9%.
Embodiment 6
As shown in Figure 1, the present invention includes matrix and with its mutually compound polycrystalline diamond layer 1, described matrix is 4 three layers of hard alloy substrate I 2, hard alloy substrate II 3 and hard alloy substrate III; One end face of described hard alloy substrate I 2 is adjacent with polycrystalline diamond layer 1, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate I 2 and hard alloy substrate II 3 is adjacent, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate II 3 and hard alloy substrate III 4 is adjacent, and the interface combining is to each other plane; Described hard alloy substrate I 2, hard alloy substrate II 3 and hard alloy substrate III 4 are comprised of tungsten carbide and metallic cobalt, the content distribution gradient of metallic cobalt, and increase successively; In described hard alloy substrate I 2, the content of metallic cobalt is 10%, and in described hard alloy substrate II 3, the content of metallic cobalt is 13%, and in described hard alloy substrate III 4, the content of metallic cobalt is 16%; Described polycrystalline diamond layer 1 is comprised of diamond crystals and metallic cobalt, and the content of diamond crystals is 90%, and the content of metallic cobalt is 10%.
Embodiment 7
As shown in Figure 2, the present invention includes matrix and with its mutually compound polycrystalline diamond layer 1, described matrix is 5 four layers of hard alloy substrate I 2, hard alloy substrate II 3, hard alloy substrate III 4 and hard alloy substrate IV; One end face of described hard alloy substrate I 2 is adjacent with polycrystalline diamond layer 1, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate I 2 and hard alloy substrate II 3 is adjacent, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate II 3 and hard alloy substrate III 4 is adjacent, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate III 4 and described hard alloy substrate IV 5 is adjacent, and the interface combining is to each other plane; Described hard alloy substrate I 2, hard alloy substrate II 3, hard alloy substrate III 4 and hard alloy substrate IV 5 are comprised of tungsten carbide and metallic cobalt, the content distribution gradient of metallic cobalt, and increase successively; In described hard alloy substrate I 2, the content of metallic cobalt is 7%, and in described carbide alloy II 3, the content of metallic cobalt is 9%, and in described hard alloy substrate III 4, the content of metallic cobalt is 11%, and in described hard alloy substrate IV 5, the content of metallic cobalt is 14%; Described polycrystalline diamond layer 1 is comprised of diamond crystals and metallic cobalt, and the content of diamond crystals is 95%, and the content of metallic cobalt is 5%.
Embodiment 8
As shown in Figure 2, the present invention includes matrix and with its mutually compound polycrystalline diamond layer 1, described matrix is 5 four layers of hard alloy substrate I 2, hard alloy substrate II 3, hard alloy substrate III 4 and hard alloy substrate IV; One end face of described hard alloy substrate I 2 is adjacent with polycrystalline diamond layer 1, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate I 2 and hard alloy substrate II 3 is adjacent, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate II 3 and hard alloy substrate III 4 is adjacent, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate III 4 and described hard alloy substrate IV 5 is adjacent, and the interface combining is to each other plane; Described hard alloy substrate I 2, hard alloy substrate II 3, hard alloy substrate III 4 and hard alloy substrate IV 5 are comprised of tungsten carbide and metallic cobalt, the content distribution gradient of metallic cobalt, and increase successively; In described hard alloy substrate I 2, the content of metallic cobalt is 8%, and in described carbide alloy II 3, the content of metallic cobalt is 10%, and in described hard alloy substrate III 4, the content of metallic cobalt is 12%, and in described hard alloy substrate IV 5, the content of metallic cobalt is 14%; Described polycrystalline diamond layer 1 is comprised of diamond crystals and metallic cobalt, and the content of diamond crystals is 92%, and the content of metallic cobalt is 8%.
Embodiment 9
As shown in Figure 2, the present invention includes matrix and with its mutually compound polycrystalline diamond layer 1, described matrix is 5 four layers of hard alloy substrate I 2, hard alloy substrate II 3, hard alloy substrate III 4 and hard alloy substrate IV; One end face of described hard alloy substrate I 2 is adjacent with polycrystalline diamond layer 1, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate I 2 and hard alloy substrate II 3 is adjacent, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate II 3 and hard alloy substrate III 4 is adjacent, and the interface combining is to each other plane; One end face of the other end of described hard alloy substrate III 4 and described hard alloy substrate IV 5 is adjacent, and the interface combining is to each other plane; Described hard alloy substrate I 2, hard alloy substrate II 3, hard alloy substrate III 4 and hard alloy substrate IV 5 are comprised of tungsten carbide and metallic cobalt, the content distribution gradient of metallic cobalt, and increase successively; In described hard alloy substrate I 2, the content of metallic cobalt is 10%, and in described carbide alloy II 3, the content of metallic cobalt is 11%, and in described hard alloy substrate III 4, the content of metallic cobalt is 13%, and in described hard alloy substrate IV 5, the content of metallic cobalt is 15%; Described polycrystalline diamond layer 1 is comprised of diamond crystals and metallic cobalt, and the content of diamond crystals is 90%, and the content of metallic cobalt is 10%.
Claims (10)
1. a diamond drill machine tooth with cobalt content gradient, it comprises matrix and the polycrystalline diamond layer mutually compound with it, it is characterized in that: described matrix is at least the hard alloy substrate that two-layer cobalt content gradient distributes, and an end face and the polycrystalline diamond layer of described hard alloy substrate are adjacent.
2. the diamond drill machine tooth with cobalt content gradient according to claim 1, it is characterized in that: described matrix is hard alloy substrate I, three layers of hard alloy substrate II and hard alloy substrate III, one end face and the polycrystalline diamond layer of described hard alloy substrate I are adjacent, one end face of the other end of described hard alloy substrate I and hard alloy substrate II is adjacent, one end face of the other end of described hard alloy substrate II and hard alloy substrate III is adjacent, described hard alloy substrate I, hard alloy substrate II and hard alloy substrate III are comprised of tungsten carbide and metallic cobalt, the content distribution gradient of metallic cobalt and increasing successively.
3. the diamond drill machine tooth with cobalt content gradient according to claim 2, it is characterized in that: in described hard alloy substrate I, the content of metallic cobalt is 6～10%, in described hard alloy substrate II, the content of metallic cobalt is 10～14%, and in described hard alloy substrate III, the content of metallic cobalt is 14～18%.
4. the diamond drill machine tooth with cobalt content gradient according to claim 1, it is characterized in that: described matrix is hard alloy substrate I, hard alloy substrate II, four layers of hard alloy substrate III and hard alloy substrate IV, one end face and the polycrystalline diamond layer of described hard alloy substrate I are adjacent, one end face of the other end of described hard alloy substrate I and hard alloy substrate II is adjacent, one end face of the other end of described hard alloy substrate II and hard alloy substrate III is adjacent, one end face of the other end of described hard alloy substrate III and described hard alloy substrate IV is adjacent, described hard alloy substrate I, hard alloy substrate II, hard alloy substrate III and hard alloy substrate IV are comprised of tungsten carbide and metallic cobalt, the content distribution gradient of metallic cobalt and increasing successively.
5. the diamond drill machine tooth with cobalt content gradient according to claim 4, it is characterized in that: in described hard alloy substrate I, the content of metallic cobalt is 6～10%, in described hard alloy substrate II, the content of metallic cobalt is 9～11%, in described hard alloy substrate III, the content of metallic cobalt is 10～14%, and in described hard alloy substrate IV, the content of metallic cobalt is 14～18%.
6. the diamond drill machine tooth with cobalt content gradient according to claim 1, is characterized in that: described polycrystalline diamond layer is comprised of diamond crystals and metallic cobalt, and the content of described diamond crystals is 90～95%, and the content of described metallic cobalt is 5～10%.
7. the diamond drill machine tooth with cobalt content gradient according to claim 1, is characterized in that: the interface that an end face of described hard alloy substrate combines with polycrystalline diamond layer is plane.
8. the diamond drill machine tooth with cobalt content gradient according to claim 1, is characterized in that: the interface that described hard alloy substrate combines with polycrystalline diamond layer is the curved surface matching.
9. the diamond drill machine tooth with cobalt content gradient according to claim 1, is characterized in that: the combination interface between described hard alloy substrate is plane.
10. the diamond drill machine tooth with cobalt content gradient according to claim 1, is characterized in that: the combination interface between described hard alloy substrate is the curved surface matching.
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Cited By (7)
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| CN104690274A (en) * | 2014-12-31 | 2015-06-10 | 江汉石油钻头股份有限公司 | PCD (polycrystalline diamond)-cemented carbide compact as well as preparation method thereof |
| CN104879066A (en) * | 2015-06-05 | 2015-09-02 | 株洲翔宇硬质合金有限公司 | Method for manufacturing diamond composite sheet substrate for drilling and composite sheet substrate |
| CN105170986A (en) * | 2015-10-29 | 2015-12-23 | 株洲西迪硬质合金科技股份有限公司 | Gradient hard alloy, preparation method and cutting tooth head |
| CN105644026A (en) * | 2015-12-25 | 2016-06-08 | 洛阳金鹭硬质合金工具有限公司 | Composite sheet substrate product with ternary composite gradient structure |
| CN106001550A (en) * | 2016-06-03 | 2016-10-12 | 广东工业大学 | Multi-stage compound cermet, preparation method thereof and shield cutter |
| CN106761429A (en) * | 2016-12-07 | 2017-05-31 | 四川大学 | A kind of diamond drill machine tooth |
| CN108893718A (en) * | 2018-06-29 | 2018-11-27 | 河南富莱格超硬材料有限公司 | A kind of base material of composite polycrystal-diamond and preparation method thereof, composite polycrystal-diamond |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104690274A (en) * | 2014-12-31 | 2015-06-10 | 江汉石油钻头股份有限公司 | PCD (polycrystalline diamond)-cemented carbide compact as well as preparation method thereof |
| CN104879066A (en) * | 2015-06-05 | 2015-09-02 | 株洲翔宇硬质合金有限公司 | Method for manufacturing diamond composite sheet substrate for drilling and composite sheet substrate |
| CN105170986A (en) * | 2015-10-29 | 2015-12-23 | 株洲西迪硬质合金科技股份有限公司 | Gradient hard alloy, preparation method and cutting tooth head |
| CN105170986B (en) * | 2015-10-29 | 2017-02-08 | 西迪技术股份有限公司 | Gradient hard alloy, preparation method and cutting tooth head |
| CN105644026A (en) * | 2015-12-25 | 2016-06-08 | 洛阳金鹭硬质合金工具有限公司 | Composite sheet substrate product with ternary composite gradient structure |
| CN105644026B (en) * | 2015-12-25 | 2018-08-03 | 洛阳金鹭硬质合金工具有限公司 | A kind of composite sheet matrix product with tri compound gradient-structure |
| CN106001550A (en) * | 2016-06-03 | 2016-10-12 | 广东工业大学 | Multi-stage compound cermet, preparation method thereof and shield cutter |
| CN106761429A (en) * | 2016-12-07 | 2017-05-31 | 四川大学 | A kind of diamond drill machine tooth |
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