CN104847274A - Multi-head arc cutting type semispherical drill bit - Google Patents

Multi-head arc cutting type semispherical drill bit Download PDF

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Publication number
CN104847274A
CN104847274A CN201510263905.2A CN201510263905A CN104847274A CN 104847274 A CN104847274 A CN 104847274A CN 201510263905 A CN201510263905 A CN 201510263905A CN 104847274 A CN104847274 A CN 104847274A
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China
Prior art keywords
cutting
head
provided
cutting element
element
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CN201510263905.2A
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Chinese (zh)
Inventor
李强
李友谊
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中国水利水电第十工程局有限公司
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Priority to CN201510263905.2A priority Critical patent/CN104847274A/en
Publication of CN104847274A publication Critical patent/CN104847274A/en

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/42Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
    • E21B10/43Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/46Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/54Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
    • E21B10/55Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits with preformed cutting elements with blades having preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts

Abstract

A multi-head arc cutting type semispherical drill bit comprises a cylindrical body. The cylindrical body is provided with an axial through shaft hole. A semi-spherical drilling head extends outwardly from the top end of the body. The body and the drilling head are integrally formed through tungsten carbide hard alloy. The drilling head is provided with three elongated first cutting parts which extends downwardly. A plurality of first keeping grooves are formed in the cutting edge of each first cutting part at intervals. A first cutting element is embedded into each retaining groove, and the first cutting element is transversely kept in the first keeping groove. Two second cutting parts are disposed between every two first cutting parts. A plurality of second keeping grooves are formed in the upper surface of each second cutting part. A second cutting element is embedded into each second keeping groove, and the second cutting element is radially kept in the second keeping groove. By the arrangement, the multi-head arc cutting type semispherical drill bit is simple in structure, convenient to operate, high in overall strength and good in cutting and drilling effects.

Description

多头弧形切割式半球形钻头 Cutting long arcuate hemispherical bit

技术领域 FIELD

[0001] 本发明涉及对地下层进行钻入的技术领域,尤其涉及一种有效提高钻孔效率的多头弧形切割式半球形钻头。 [0001] The present invention relates to subterranean drill for the technology, and particularly relates to an effective increase the drilling efficiency of cutting the long arc type hemispherical bit.

背景技术 Background technique

[0002] 为了更好的对地下层进行探测、挖掘和资源提取等,需要对地下层进行有效快速的钻孔操作,即通过一个钻头对地下层进行钻进,以在地下层形成预定深度的钻孔。 [0002] In order to detect the basement, mining and extraction of resources, the need for effective and fast to subterranean drilling operations, namely drilling of a subterranean drill bit through, to form a predetermined depth in the basement drilling.

[0003] 为实现钻进,通常通过一个能对地下的岩石、泥土、沙砾等形成切割功能的钻头,以及带动钻头进行旋转的驱动装置,和引导钻头进行钻进的导杆等相互配合,组成一个向下钻进的装置。 [0003] In order to achieve drilling, can be formed typically by a subsurface rock, soil, gravel and other features of the cutting bit, and drive means for rotating the drill bit drive, and guide the drill bit and other drilling guide rod cooperate with each other to form a downhole device.

[0004] 而随着地下层情况的愈加复杂,对钻孔的要求更高,为了适应这种要求,需要对钻头的性能提出更高的要求。 [0004] With the increasingly complex basement case higher requirements for drilling, in order to meet this requirement, requires higher demands on the performance of the drill bit.

[0005] 为此,本发明的设计者有鉴于上述缺陷,通过潜心研宄和设计,综合长期多年从事相关产业的经验和成果,研宄设计出一种多头弧形切割式半球形钻头,以克服上述缺陷。 [0005] To this end, the designers of the invention In view of the above drawbacks, through painstaking research and design traitor, comprehensive long-term outcome of many years of experience and related industries, a Subsidiary to design a long arc cutting ceremony hemispherical drill to overcome these shortcomings.

发明内容 SUMMARY

[0006] 本发明的技术目的在于提供一种多头弧形切割式半球形钻头,其强度更好,提高钻孔效率,实用性更好。 [0006] The technical object of the present invention is to provide a multi-head type hemispherical curved cutting bit, better strength, increase drilling efficiency, better practicability.

[0007] 为解决上述问题,本发明公开了一种多头弧形切割式半球形钻头,包含一圆柱状的本体,所述圆柱状的本体设有轴向贯通的轴孔,所述本体的顶端向外延伸出呈半圆球状的钻削头,所述本体和钻削头为碳化钨硬质合金一体成型,其特征在于: [0007] In order to solve the above problems, the present invention discloses a multi-head cutting type drill hemispherical arc, comprising a cylindrical body, said cylindrical body is provided with a shaft hole extending axially therethrough, said body top outwardly extending semicircular spherical drilling head, the drill head body and integrally formed as tungsten carbide, wherein:

[0008] 所述钻削头上设有三条向下延伸的呈长条状的第一切割部,且在第一切割部之间设有通孔,各通孔连接至所述本体的轴孔以便于切削液的流通; [0008] The drilling head is provided with a first elongated stripe three cutting portion extending downwardly and provided with a through hole between the first cutting portion, each of the through holes connected to the body of the axial bore to facilitate flow of the cutting fluid;

[0009] 各所述第一切割部的切割缘上间隔设有多个第一保持槽,各第一保持槽分别嵌有第一切割元件,所述第一切割元件横向的保持在第一保持槽内,所述两两第一切割部之间均设有两个第二切割部,所述第二切割的上表面间隔设有多个第二保持槽,各第二保持槽分别嵌有第二切割元件,所述第二切割元件径向的保持在第二保持槽内; [0009] The spacer is provided on the cutting edge of the first cutting portion of each of said first plurality of retaining grooves, each groove respectively holding the first cutting element fitted with a first lateral holding the first cutting element in a first holding provided between each groove, said two two first cutting portion two second cutting portion, said second upper cut surface of the spacer is provided with a second plurality of retaining grooves, each of the second holding grooves are fitted with a first two cutting elements, the second cutting element is radially held in the second holding tank;

[0010] 该第二切割元件包含头部和基部,所述头部为半圆球状且设置于所述基部的顶端,所述基部的底端连接至所述第二保持槽,其中,所述头部为聚晶金刚石制成,所述基部通过碳化鹤硬质合金制成。 [0010] The second cutting element comprises a base portion and a head portion, the head portion is a semi-sphere and provided at the top of the base, the base is connected to the bottom end of the second holding groove, wherein the head portion is made of polycrystalline diamond, said cemented carbide base made by carbonization crane.

[0011] 其中:各第一切割元件相互之间的距离为1-1Omm之间,各第二切割元件相互之间的距离为10-30mm。 [0011] wherein: each of the first mutual distance between the cutting element 1-1Omm, the distance between the second cutting elements are of 10-30mm.

[0012] 其中:所述基部下部的外缘设有连接螺纹,所述第二保持槽内设有与所述连接螺纹啮合连接的内螺纹。 [0012] wherein: a lower portion of an outer edge of said base portion is provided with an internal thread threadedly engaged with the connecting connector connecting threads, the second holding tank is provided.

[0013] 其中:所述基部的上部设有凸缘,所述凸缘具有供所述头部嵌入的嵌槽,所述嵌槽设有外螺纹,所述头部设有与所述外螺纹啮合连接的内螺纹。 [0013] wherein: said upper base portion is provided with a flange having a head portion for embedding the embedding groove, the insert is provided with an external thread groove, the head portion is provided with the external thread engaging the threaded connection.

[0014] 其中:各第一切割元件的切削刃为顶端的半圆形,各第二切割元件的切削刃为半圆球的头部外缘,所述第一切割元件15的切削刃距离半球形的球心存在一个最大距离和一个最小距离,所述第二切割元件的切削刃距离半球形的球心也具有一个最大距离和一个最小距离,所述第一切割元件的最大距离大于第二元件的最大距离,第一切割元件的最小距离等于第二元件的最小距离。 [0014] wherein: the cutting edge of each cutting element is a first semi-circular tip, the cutting edge of each cutting element is a second semicircular outer periphery of the ball head, the first cutting element from the cutting edge 15 of the hemispherical the center of the sphere there is a maximum distance and a minimum distance of the cutting edge from the second cutting element having a hemispherical sphere center is also the maximum distance and a minimum distance, maximum distance is greater than the first cutting element the second element maximum distance, the minimum distance of the first cutting element is equal to the minimum distance of the second element.

[0015] 通过上述结构可知,本发明具有如下技术效果: [0015] found that the above-described configuration, the present invention has the following technical effects:

[0016] 1、结构简单,操作方便; [0016] 1, simple structure, convenient operation;

[0017] 2、整体强度更高,具有较好的切割和钻入效果。 [0017] 2, the overall higher strength, and the drill has good cutting effect.

[0018] 本发明的详细内容可通过后述的说明及所附图而得到。 [0018] Detailed description of the present invention described later can be obtained and the accompanying drawings.

附图说明 BRIEF DESCRIPTION

[0019] 图1显示了本发明钻头的结构示意图。 [0019] Figure 1 shows a schematic structure of a drill bit of the present invention.

[0020] 图2显示了本发明第二切割元件的结构示意图。 [0020] FIG. 2 shows a schematic structure of a second cutting element of the present invention.

[0021] 图3显示了本发明第二切割元件的剖视图。 [0021] Figure 3 shows a cross-sectional view of a second cutting element of the present invention.

[0022] 附图标记: [0022] The reference numerals:

[0023] 11、本体;12、钻削头;13、第一切割部;14、第二切割部;15、第一切割元件;16、第二切割元件;17、通孔;21、头部;22、基部;23、连接螺纹;24、凸缘;25、内螺纹;26、外螺纹。 [0023] 11, a body; 12, drilling head; 13, a first cutting portion; 14, a second cutting unit; 15, a first cutting element; 16, a second cutting element; 17, a through hole; 21, head portion ; 22, a base; 23, connecting thread; 24, flange; 25, internal threads; 26, external threads.

具体实施方式 Detailed ways

[0024] 参见图1,显示了本发明的多头弧形切割式半球形钻头。 [0024] Referring to Figure 1, the present invention shows a long arc type hemispherical cutter drill bit.

[0025] 所述多头弧形切割式半球形钻头包含一圆柱状的本体11,所述圆柱状的本体11设有轴向贯通的轴孔,所述本体11的顶端向外延伸出呈半圆球状的钻削头12,可选的是,所述本体11和钻削头12可为碳化钨硬质合金一体成型,以保证了钻头的整体强度,在另外的实施例中,所述本体11可为合金钢、不锈钢等材质制成,所述钻削头12可为碳化钨硬质合金制成,且所述钻削头12可分别通过通过粘结等方式连接本体11顶端。 [0025] The long arcuate cutting type drill bit comprises a hemispherical cylindrical body 11, the cylindrical body is provided with a shaft hole 11 extending axially therethrough, the tip body 11 extends outwardly semispherical shape drilling head 12, optionally, the drilling head 12 and body 11 may be integrally formed as tungsten carbide, in order to ensure the overall strength of the drill bit, in a further embodiment, the body 11 may be alloy steel, stainless steel and other materials is made, the drilling head 12 may be made of tungsten carbide, and the drilling head 12 may be respectively connected to the top of the body 11 by bonding or the like.

[0026] 其中,所述钻削头12上设有三条向下延伸的呈长条状的第一切割部13,且在第一切割部13之间设有通孔17,各通孔17连接至所述本体11的轴孔,以便于切削液的流通。 [0026] wherein the drilling head is provided on the cutting portion 12 of the first elongated stripe three 13 extending downwardly, and a through hole 17 between the first cutting portion 13, through holes 17 are connected to the shaft hole 11 of the main body, so that the flow of the cutting fluid.

[0027] 可选的是,各所述第一切割部13相互等距间隔设置且沿球面延伸至所述本体11,其中,所述第一切割部13的切割缘(图1所示在各第一切割部的顺时针侧)上间隔设有多个第一保持槽,各第一保持槽分别嵌有第一切割元件15,其中,所述第一切割元件15为圆柱状,其横向的保持在第一保持槽内,由此,在钻头旋转时,第一切割部13上的多个第一切割元件15对岩石等坚硬物体进行切割。 [0027] Optionally, each of the first cutting portion 13 are equidistantly spaced and extending along a spherical surface 11 to the body, wherein the first cutting portion of the cutting edge 13 (FIG. 1 shown in the It provided at intervals in the clockwise side of the first cutting portion) holding a first plurality of grooves, each groove respectively holding the first embedded with first cutting element 15, wherein the first cutting element 15 is cylindrical, the lateral first holding groove, whereby, upon rotation of the drill bit, a first plurality of rock cutting elements 15 and the like on the first cutting unit 13 for cutting hard objects.

[0028] 为更好的提供切割效果,所述两两第一切割部13之间均设有两个第二切割部14,所述第二切割部14间隔设置且分别沿球面延伸至所述本体11,其中,所述第二切割部14的上表面间隔设有多个第二保持槽,各第二保持槽分别嵌有第二切割元件16,其中,所述第二切割元件16径向的保持在第二保持槽内,由此,如图所示,本发明的第二切割元件16和第一切割元件15相互垂直设置,形成一个立体的切割状态。 [0028] For the better cutting effect, two first of said two cutting portion has two cutting portions 14 between the second 13, spacer 14 and the second cutting portion is provided to extend along the spherical surface body 11, wherein an upper surface of the second cutting portion 14 is provided with a plurality of spaced second retaining grooves, each of the second holding grooves are embedded with a second cutting element 16, wherein the second cutting element 16 radially held in the second holding tank, whereby, as shown, a second cutting element of the present invention, first cutting element 16 and 15 arranged perpendicular to each other, forming a three-dimensional cutting state.

[0029] 其中,在钻头切割时,第一切割部13和第二切割部14相互配合设置,且切割元件相互切割的方向也不同,形成的切割效果能实现互补,更好的对地下岩石等坚硬物体进行快速切割。 [0029] wherein, in the drill cutting, the first cutting portion 13 and the second cutting portion 14 each fit arrangement, and the cutting direction of the cutting element are also different from each other, forming a cutting effect can be achieved is complementary to better underground rocks fast cutting hard objects.

[0030] 优选的是,各第一切割元件15等距间隔排列,且相互之间的距离为1-1Omm之间,各第二切割元件16等距间隔排列,且相互之间的距离为10-30mm。 [0030] Preferably, each of the 15 equally spaced first cutting element, and the mutual distance between 1-1Omm, for each of the second cutting member 16 equally spaced, and the distance between each 10 -30mm.

[0031] 相比现有的钻头,本发明的钻头能充分利用空间,并利用第一切割部和第二切割部之间的位置配合和在钻削头的对应设置,有效提高切割效率和强度。 [0031] compared to conventional drill bit of the present invention can make full use of space, and use the position of engagement between the first and second cutting portion and the cutting portion provided at the corresponding drill head, the cutting efficiency and improve the strength .

[0032] 参见图2和图3,显示了第二切割元件16的其中一个实施例,该第二切割元件16包含头部21和基部22,所述头部21为半圆球状且设置于所述基部22的顶端,所述基部22的底端连接至所述第二保持槽,其中,所述头部21为聚晶金刚石制成,所述基部22通过碳化钨硬质合金制成,由此,通过基部22的材质和钻削头的材质相同,其连接强度能得到保证,而头部21的半圆球形和聚晶金刚石则确保了研磨切削的强度。 [0032] Referring to FIGS. 2 and 3, which shows the second cutting element 16 in one embodiment, the second cutting element 16 comprises a head portion 21 and the base 22, the head portion 21 is disposed on the semi-spherical shape and to the top of the base 22, the bottom end of the base portion 22 is connected to the second retaining groove, wherein the head portion 21 is made of polycrystalline diamond, the base 22 is made of tungsten carbide by, whereby through the material of the base material and the drill head 22 is the same, connection strength can be guaranteed, and the half spherical head portion 21 is ensured and the strength of the polycrystalline diamond abrasive cutting.

[0033] 可选的是,所述基部22下部的外缘设有连接螺纹23,所述第二保持槽内设有与所述连接螺纹23啮合连接的内螺纹,所述基部22的上部设有凸缘24,所述凸缘24具有供所述头部21嵌入的嵌槽,所述嵌槽设有外螺纹26,所述头部设有与所述外螺纹26啮合连接的内螺纹25。 [0033] Alternatively, the outer edge of the base portion 22 is provided with a lower threaded connector 23, the second holding tank is provided with an internal thread 23 engaged with the connecting thread connection, the upper base portion 22 is provided a flange 24, the flange insertion groove 24 having the head portion 21 for embedding the insertion groove 26 is provided with an external thread, a head portion connected to an internal thread engaging the external thread 26 of 25 .

[0034] 其中,本领域技术人员可以理解的是,各第一切割元件15的切削刃为顶端的半圆形,各第二切割元件16的切削刃为半圆球的头部外缘,为更好的调整第一切割元件和第二切割元件的切割位置,所述第一切割元件15的切削刃距离半球形的球心存在一个最大距离(即半圆形的顶端和球心的距离)和一个最小距离(即半圆形的底端和球心的距离),所述第二切割元件的切削刃距离半球形的球心同样具有一个最大距离和一个最小距离,即半圆球的头部顶端和底端与球心的距离,其中,所述第一切割元件的最大距离大于第二元件的最大距离,第一切割元件的最小距离等于第二元件的最小距离,这样,通过第一切割元件的强力切割,再通过第二切割元件的研磨切割,充分发挥各切割元件的切割性能,提高切割效率。 [0034] wherein skilled in the art will be appreciated that each of the first cutting element as the cutting edge 15 of the top semi-circular, each of the second cutting element as the cutting edge 16 of the outer edge of hemispherical head, a more good adjustment of the cutting position of the first cutting element and a second cutting element, there is a maximum distance (i.e., distance to the top and center of the sphere semicircular) from the cutting edge of the first cutting element hemispherical ball center 15 and a minimum distance (i.e., distance from the bottom center of the sphere and a semi-circular), the cutting edge from the second cutting member also has a hemispherical sphere center and the maximum distance of a minimum distance, i.e. the top of the head of the hemisphere and the center of the sphere from the bottom end, wherein said maximum distance is greater than the maximum distance of the first cutting element the second element, the first cutting element is the minimum distance equal to the minimum distance of the second element, so that the first cutting element strong cutting, grinding and then cut by a second cutting element, each of the full cutting performance of the cutting element, to improve cutting efficiency.

[0035] 本发明的优点在于: [0035] The advantage of the present invention:

[0036] 1、结构简单,配合便利,操作方便; [0036] 1, the structure is simple, with convenient, easy to operate;

[0037] 2、钻头强度更高,具有较好的切割和钻入效果。 [0037] 2, bit higher strength, and the drill has good cutting effect.

[0038] 显而易见的是,以上的描述和记载仅仅是举例而不是为了限制本发明的公开内容、应用或使用。 [0038] be apparent that the foregoing description and described are merely illustrative of the present invention is not intended to limit the disclosure, application, or uses. 虽然已经在实施例中描述过并且在附图中描述了实施例,但本发明不限制由附图示例和在实施例中描述的作为目前认为的最佳模式以实施本发明的教导的特定例子,本发明的范围将包括落入前面的说明书和所附的权利要求的任何实施例。 Although embodiments have been described in the embodiment over the embodiments described and illustrated in the drawings, the present invention is not limited to the specific examples of the best mode presently considered to implement the teachings of the present invention are described in the accompanying drawings and exemplary embodiments , the scope of the present invention will include any embodiments falling within the foregoing description and the appended claim requirements.

Claims (5)

1.一种多头弧形切割式半球形钻头,包含一圆柱状的本体,所述圆柱状的本体设有轴向贯通的轴孔,所述本体的顶端向外延伸出呈半圆球状的钻削头,所述本体和钻削头为碳化鹤硬质合金一体成型,其特征在于: 所述钻削头上设有三条向下延伸的呈长条状的第一切割部,且在第一切割部之间设有通孔,各通孔连接至所述本体的轴孔以便于切削液的流通; 各所述第一切割部的切割缘上间隔设有多个第一保持槽,各第一保持槽分别嵌有第一切割元件,所述第一切割元件横向的保持在第一保持槽内,所述两两第一切割部之间均设有两个第二切割部,所述第二切割的上表面间隔设有多个第二保持槽,各第二保持槽分别嵌有第二切割元件,所述第二切割元件径向的保持在第二保持槽内; 该第二切割元件包含头部和基部,所述头部为半圆球状且设置于所述基部 A long semi-spherical arcuate cutting type drill bit, comprising a cylindrical body, said cylindrical body is provided with a shaft hole extending axially therethrough, said body extending outwardly of the semicircular top spherical drilling head, the body and a cemented carbide drill head crane carbide integrally formed, characterized in that: said drilling head is provided with a first elongated stripe three cutting portion extending downward, and the first cutting is provided between the through-hole, the through hole is connected to the shaft hole of the body so as to circulate the cutting fluid; a plurality of first holding grooves are provided at intervals on the cutting edge of each of said first cutting portion, each of the first a first holding grooves are embedded cutting element, holding the first transverse cutting element between the first retaining groove, said two two first cutting portion has two second cutting portion, said second upper cut surface of the spacer is provided with a plurality of second holding grooves, each groove respectively holding the second cutting insert has a second element, held in the second holding tank of the second radial cutting element; the second cutting element comprising head and base, the semi-spherical head portion and is disposed on the base portion 顶端,所述基部的底端连接至所述第二保持槽,其中,所述头部为聚晶金刚石制成,所述基部通过碳化鹤硬质合金制成。 Top, bottom end of the base portion is connected to the second retaining groove, wherein the head is made of polycrystalline diamond, said cemented carbide base made by carbonization crane.
2.如权利要求1所述的多头弧形切割式半球形钻头,其特征在于:各第一切割元件相互之间的距离为1-1Omm之间,各第二切割元件相互之间的距离为10-30mm。 2. The long curved hemispherical cutter drill bit according to the formula of claim 1, wherein: 1-1Omm between the distance between the first cutting element to each other, the distance between each of the second cutting element 10-30mm.
3.如权利要求1所述的多头弧形切割式半球形钻头,其特征在于:所述基部下部的外缘设有连接螺纹,所述第二保持槽内设有与所述连接螺纹啮合连接的内螺纹。 3. The arcuate long hemispherical cutter drill bit according to the formula of claim 1, wherein: said lower base portion is provided with an outer edge of the threaded connection, said second retaining groove is provided with a threaded connector engaged with the connector internal thread.
4.如权利要求1所述的多头弧形切割式半球形钻头,其特征在于:所述基部的上部设有凸缘,所述凸缘具有供所述头部嵌入的嵌槽,所述嵌槽设有外螺纹,所述头部设有与所述外螺纹啮合连接的内螺纹。 4. The long curved hemispherical cutter drill bit according to the formula of claim 1, wherein: said upper base portion is provided with a flange having a head portion for embedding the embedding groove, the insert It is provided with an external thread groove, the head portion connected to an internal thread engaging said external thread.
5.如权利要求1所述的多头弧形切割式半球形钻头,其特征在于:各第一切割元件的切削刃为顶端的半圆形,各第二切割元件的切削刃为半圆球的头部外缘,所述第一切割元件15的切削刃距离半球形的球心存在一个最大距离和一个最小距离,所述第二切割元件的切削刃距离半球形的球心也具有一个最大距离和一个最小距离,所述第一切割元件的最大距离大于第二元件的最大距离,第一切割元件的最小距离等于第二元件的最小距离。 5. The long curved hemispherical cutter drill bit according to the formula of claim 1, wherein: the cutting edge of each cutting element is a first semi-circular tip, the cutting edge of each cutting element is a second hemispherical head the outer edge, the cutting edge from the hemispherical element 15 of the first cutting center of the sphere there is a maximum distance and a minimum distance from the cutting edge of the hemispherical center of the sphere of the second cutting element having a maximum distance and also a minimum distance, maximum distance of the first cutting element is greater than a maximum distance from the second member, a minimum distance equal to the minimum distance from the second element of the first cutting element.
CN201510263905.2A 2015-05-19 2015-05-19 Multi-head arc cutting type semispherical drill bit CN104847274A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4471845A (en) * 1981-04-01 1984-09-18 Christensen, Inc. Rotary drill bit
US4889017A (en) * 1984-07-19 1989-12-26 Reed Tool Co., Ltd. Rotary drill bit for use in drilling holes in subsurface earth formations
US20090107732A1 (en) * 2007-10-31 2009-04-30 Mcclain Eric E Impregnated rotary drag bit and related methods
US20120080240A1 (en) * 2010-10-05 2012-04-05 Baker Hughes Incorporated Diamond impregnated cutting structures, earth-boring drill bits and other tools including diamond impregnated cutting structures, and related methods
CN202451060U (en) * 2012-02-24 2012-09-26 江西耀升工贸发展有限公司 Novel spherical tooth based on hard alloy
CN202659151U (en) * 2012-05-18 2013-01-09 西南石油大学 Scraping cutting and impacting combined drilling bit
CN204627423U (en) * 2015-05-19 2015-09-09 中国水利水电第十工程局有限公司 Bull arc cutting style hemisphere drill bit

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4471845A (en) * 1981-04-01 1984-09-18 Christensen, Inc. Rotary drill bit
US4889017A (en) * 1984-07-19 1989-12-26 Reed Tool Co., Ltd. Rotary drill bit for use in drilling holes in subsurface earth formations
US20090107732A1 (en) * 2007-10-31 2009-04-30 Mcclain Eric E Impregnated rotary drag bit and related methods
US20120080240A1 (en) * 2010-10-05 2012-04-05 Baker Hughes Incorporated Diamond impregnated cutting structures, earth-boring drill bits and other tools including diamond impregnated cutting structures, and related methods
CN202451060U (en) * 2012-02-24 2012-09-26 江西耀升工贸发展有限公司 Novel spherical tooth based on hard alloy
CN202659151U (en) * 2012-05-18 2013-01-09 西南石油大学 Scraping cutting and impacting combined drilling bit
CN204627423U (en) * 2015-05-19 2015-09-09 中国水利水电第十工程局有限公司 Bull arc cutting style hemisphere drill bit

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