WO2017181558A1 - 半圆钻 - Google Patents

半圆钻 Download PDF

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Publication number
WO2017181558A1
WO2017181558A1 PCT/CN2016/093009 CN2016093009W WO2017181558A1 WO 2017181558 A1 WO2017181558 A1 WO 2017181558A1 CN 2016093009 W CN2016093009 W CN 2016093009W WO 2017181558 A1 WO2017181558 A1 WO 2017181558A1
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WO
WIPO (PCT)
Prior art keywords
processing
rod
machining
drill
semicircular
Prior art date
Application number
PCT/CN2016/093009
Other languages
English (en)
French (fr)
Inventor
任保民
朱学明
Original Assignee
深圳市金洲精工科技股份有限公司
Priority date (The priority date 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 date listed.)
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Application filed by 深圳市金洲精工科技股份有限公司 filed Critical 深圳市金洲精工科技股份有限公司
Publication of WO2017181558A1 publication Critical patent/WO2017181558A1/zh

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/08—Drills combined with tool parts or tools for performing additional working
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/04—Angles, e.g. cutting angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/24—Overall form of drilling tools

Definitions

  • the present invention belongs to the field of machining tools, and more particularly to a semi-circular drill.
  • the through hole boring is drilled on a non-ferrous metal by a drill bit, and is usually processed by a conventional twist drill or a step drill type drill bit, which has the advantages of high production efficiency and long life.
  • a twist drill due to the design structure of the spiral groove, the chips in the processing groove are discharged along the spiral groove, and the chip and the hole wall friction may occur, causing the hole wall to be scratched; Machining, which is equivalent to dividing the hole into drilling and reaming, is more common than ordinary twist drilling, and the surface roughness of the hole wall is high, and there is still no power for the highly required hole wall quality.
  • the object of the present invention is to overcome the above-mentioned deficiencies of the prior art, and to provide a semi-circular drill which not only has high drilling efficiency, long service life, but also ensures the processing quality of the hole wall, and satisfies the processing of the hole today. Quality requirements.
  • a semi-circular drill comprising a shank for mounting a clamp and a drill rod for reaming and squeezing, the drill rod comprising a semi-circular cross section a first shaped processing rod and a second processing rod, wherein the diameter of the first processing rod is smaller than the diameter of the second processing rod; one end of the first processing rod is connected to the second processing rod, and the other end
  • a drilling structure for drilling is provided, and a transition step for squeezing the wall of the hole is provided at a joint of the first processing rod and the second processing rod.
  • the drilling structure includes a first processing blade and a second machining blade disposed on a top end of the first processing bar, and the first machining blade and the second machining blade are obliquely disposed, and One end intersecting Drill into the tip.
  • an angle between the first processing blade and the second processing blade is 110° to 120°.
  • an angle between the first processing blade and the first processing bar axis is 45° to 70°.
  • the sidewalls of the first processing rod and the second processing rod are recessed inwardly to provide a chip pocket for receiving the chips.
  • the chip flutes are provided in plurality, and each of the chip flutes is disposed at intervals.
  • the chip pocket is an eccentric circle, and the radius deviation of the chip pocket ranges from 0.03 to 0.05 mm.
  • a surface roughness of the sidewalls of the first processing rod and the second processing rod is 0.2.
  • the diameter of the first processing rod is 0.5 to 3 mm
  • the diameter of the second processing rod is greater than the diameter of the first processing rod by 0.04 to 0.05 mm.
  • the length of the first processing rod is 0.8 to 3 mm
  • the length of the second processing rod is greater than the length of the first processing rod by 0.5 to 5 mm.
  • a semi-circular drill formed by using a combination of a first processing rod and a second processing rod having two radial cross-sections in a "semi-circular" shape, and at the same time, in the first processing rod
  • a drilling structure is disposed on the end, and a transition step for squeezing the wall of the hole is provided at the junction of the first processing rod and the second processing rod.
  • the semi-circular drill pipe can avoid the chip scraping hole wall, and after the first machining rod completes the preliminary drilling, the size of the boring positioning hole is performed by the second processing rod, and the transition step can be the hole.
  • the walls are ground to achieve a composite process, which improves the rough wall and scratching problems previously caused by twist drills or step drills. Through the semi-circular drill, the quality of the hole wall is improved, and the production efficiency is also improved.
  • FIG. 1 is a front view of a semicircular drill according to an embodiment of the present invention.
  • FIG. 2 is a plan view of a semicircular drill provided by an embodiment of the present invention.
  • FIG. 3 is a schematic cross-sectional view taken along line AA of FIG. 1.
  • a semi-circular drill 1 is mainly used for drilling a through hole in a non-ferrous metal such as a copper alloy or an aluminum alloy, as in the high-end watch industry, the mobile phone industry. Processing of parts, etc.
  • the semicircular drill 1 includes a drill shank 11 for mounting a clamp and a drill pipe 12 for reaming and squeezing. With the boring, the shank 11 is mounted to the drive mechanism, and then the final through hole machining can be achieved by the reaming and squeezing of the drill pipe 12.
  • the drill pipe 12 includes a first machining rod 121 and a second machining rod 122 each having a semi-circular cross section in a radial cross section, that is, at the first processing rod 121 and the second processing rod 122.
  • Each of the axial directions has a flat surface.
  • the diameter of the first processing rod 121 is smaller than the diameter of the second processing rod 122, and one end of the first processing rod 121 is connected to the second processing rod 122, and in another A drilling structure 13 for drilling is provided on one end.
  • the two flat surfaces are on the same plane, so that when the drilling process is performed, the hole wall can be combined with the hole wall to form a straight groove, which can accommodate the processing ⁇ .
  • the generated chips prevent the chips from rubbing against the walls of the holes and scratching the walls of the holes.
  • the reaming drilling is first performed by the first processing rod 121, and the drilling structure 13 can be reduced because the drilling structure 13 is disposed on the top end thereof.
  • the contact area with the metal material to be drilled can increase the reaming force and ensure the processing efficiency of the borehole.
  • the diameter of the second processing rod 122 is larger than the diameter of the first processing rod 121.
  • the difference in diameter values between the first processing bar 121 and the second machining bar 122 is small, thereby ensuring that the squeezing process can be performed smoothly.
  • the wall of the hole formed by the squeezing process has a small surface roughness, which ensures the quality of the hole wall.
  • the semicircular drill 1 provided in the embodiment of the present invention is provided with a transition step 14 for squeezing the wall of the hole at the junction of the first processing rod 121 and the second processing rod 122.
  • the transition step 14 is not provided with a cutting edge, so that the hole wall is not cut during the machining process, but the hole wall is continuously ground during the boring process.
  • the problem of the rough wall and the scratching of the hole wall caused by the twist drill or the step drilling process is improved, the quality of the hole wall is improved, and the processing requirements for the quality of the hole wall are satisfied.
  • the transition step 14 may be arranged in an arc shape or a chamfer shape (which may be formed by sharp grinding repair of the grinding wheel after machining).
  • the cutting edge is not provided, so that the second machining rod 122 is squeezing the wall of the hole, and the quality of the hole wall can be improved by the grinding of the transition step 14.
  • the transition step 14 is set to be chamfered.
  • the semicircular drill 1 provided in the embodiment of the present invention is formed by combining the first processing rod 121 and the second processing rod 122 which are two semi-circular radial cross sections. Therefore, in the processing of the hole, the flat side of the drill pipe 12 can form a straight groove capable of accommodating the chip, avoiding the friction between the chip and the hole wall and scraping the hole wall, thereby improving the conventional twist drill or step drill. Rough wall and scratching problems caused by the processing.
  • the drilling structure 13 disposed on the top end of the first processing rod 121 ensures the processing efficiency of the reaming hole
  • the transition step 14 disposed at the junction of the first processing rod 121 and the second processing rod 122 can continuously Squeeze the hole wall so that the surface roughness of the hole wall can achieve the mirror effect of the reamer cutting, and the hole wall processing quality is good.
  • the semi-circular drill 1 realizes the composite processing of reaming and squeezing, effectively solves the problem that the surface roughness of the hole wall is high after the through hole processing on the non-ferrous metal, and the production efficiency is improved. High reliability.
  • the drilling structure 13 includes a first machining blade 131 and a second machining blade 132 disposed on the top end of the first processing bar 121, a first machining blade 131 and a
  • the two processing blades 132 are obtained by recessing the end surface inwardly and removing the material.
  • the formed first processing blade 131 and the second processing blade 132 are obliquely distributed, and one end intersects to form a drill tip, and the other end gradually The separation extends to be connected to the side wall of the first processing rod 121.
  • the first machining blade 131 and the second machining blade 1 32 have sharper cutting edges and combined with the drill tip, which can effectively improve the efficiency of drilling.
  • first processing blade 131 and the second processing blade 132 may also be formed by being protruded on the end surface of the first processing bar 121, that is, by removing other materials on the first processing bar 121, and the manufacturing method is various, in a specific manner. , can be set according to the actual design requirements, there is no limit here.
  • the angle ⁇ between the first processing blade 131 and the second processing blade 132 is set to 110° to 120. °, preferably with an angle of 115° .
  • the angle between the first machining blade 131 and the second machining blade 13 2 can be set to be flexible in other angle ranges according to different processing requirements, and can meet different usage requirements.
  • the angle ⁇ between the first machining edge 131 and the axis of the first processing rod 121 is 45° to 70°, and preferably the angle is 60°. This allows for a strong reaming force, while also ensuring its own strength, ensuring reliability and long service life.
  • the sidewalls of the first processing rod 12 1 and the second processing rod 122 are recessed inwardly for receiving Chip flutes 15 for the chips.
  • a blade-like structure is formed on the side walls of the first processing bar 121 and the second processing bar 122, so that not only the ability to cut the material but also the function of accommodating the chips can be improved in the processing of the crucible.
  • the generated chips can be placed in the chip pocket 15, further preventing the chips from rubbing against the hole walls, preventing the walls of the holes from being scratched, and ensuring the processing quality of the holes.
  • a plurality of chip flutes 15 are provided, and the chip flutes 15 are spaced apart.
  • the chip pocket 15 is an eccentric circle, and the radius deviation range of the chip pocket 15 is set at 0.03 to 0.
  • the eccentric setting improves the chipping force and facilitates the discharge of chips, which improves the efficiency of the drilling process.
  • the surface roughness of the sidewalls of the first processing bar 121 and the second processing bar 122 is 0.2.
  • the outer circumference of the first processing rod 121 and the second processing rod 122 is made to have an inverted cone amount of 0.005 mm to avoid stress concentration and ensure the reliability of the structural strength.
  • the diameter of the first processing rod 121 is set to 0.5 to 3 mm according to processing requirements
  • the diameter of the second processing rod 122 is set to be larger than the diameter of the first processing rod 121 by 0.04 to 0.05. Mm.
  • the diameters of the first processing bar 121 and the second machining bar 122 are small, thereby ensuring that the squeezing can be performed smoothly.
  • the length of the first processing rod 121 is 0.8 ⁇ 3mm
  • the length of the second processing rod 122 is greater than the length of the first processing rod 121 by 0.5 ⁇ 5mm
  • the types of models are various, so that different models can be selected according to different drilling requirements. , Wide range of applications.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

一种半圆钻（1），包括用于安装夹持的钻柄（11）和用于铰削及挤削加工的钻杆（12），钻杆（12）包括径向横截面均呈"半圆"形的第一加工杆（121）和第二加工杆（122），第一加工杆（121）的直径小于第二加工杆（122）的直径；第一加工杆（121）的一端与第二加工杆（122）连接，另一端设置有用于钻孔的钻削结构（13），于第一加工杆（121）和第二加工杆（122）的连接处设置有用于挤削孔壁的过渡台阶（14）。该半圆钻不仅钻孔效率高，使用寿命长，而且能够确保孔壁的加工质量，满足了现今对孔的加工质量的要求。

Description

说明书 发明名称：半圆钻
技术领域
[0001] 本发明属于加工刀具领域， 尤其涉及一种半圆钻。
背景技术
[0002] 现今， 通过钻头在有色金属上钻削通孔吋， 通常采用普通麻花钻或者台阶钻类 的钻头进行加工， 此类钻头具有生产效率较高， 寿命较长等优点。 但是， 采用 麻花钻进行加工吋， 由于具有螺旋槽的设计结构， 加工吋槽内有切屑沿着螺旋 槽排出吋， 会出现切屑和孔壁摩擦， 造成孔壁刮伤的现象； 而用台阶钻加工， 相当于将孔分成钻孔和扩孔加工， 这样较普通麻花钻加工， 该孔壁表面粗糙度 较高外， 而且对很高要求的孔壁质量还是无能为力。 同吋台阶处必须做清根处 理， 即台阶处有了一定的清根深度， 但这样会造成刀具钻孔吋此清根槽内会藏 或粘有切屑， 从而在刀具旋转吋， 切屑会和孔壁摩擦造成刮花， 影响孔壁的表 面粗糙度及质量。 因而， 现有的钻头不能满足对孔壁加工质量的要求。
技术问题
[0003] 本发明的目的在于克服上述现有技术的不足， 提供了一种半圆钻， 其不仅钻孔 效率高， 使用寿命长， 而且能够确保孔壁的加工质量， 满足了现今对孔的加工 质量的要求。
问题的解决方案
技术解决方案
[0004] 本发明是这样实现的： 一种半圆钻， 包括用于安装夹持的钻柄和用于铰削及挤 削加工的钻杆， 所述钻杆包括径向横截面均呈"半圆"形的第一加工杆和第二加工 杆， 所述第一加工杆的直径小于所述第二加工杆的直径； 所述第一加工杆的一 端与所述第二加工杆连接， 另一端设置有用于钻孔的钻削结构， 于所述第一加 工杆和所述第二加工杆的连接处设置有用于挤削孔壁的过渡台阶。
[0005] 具体地， 所述钻削结构包括设置在所述第一加工杆顶端上的第一加工刀刃和第 二加工刀刃， 所述第一加工刀刃和所述第二加工刀刃倾斜设置， 且一端相交形 成钻尖。
[0006] 具体地， 所述第一加工刀刃和所述第二加工刀刃之间的夹角为 110°〜120°。
[0007] 具体地， 所述第一加工刀刃和所述第一加工杆轴线的夹角为 45°〜70°。
[0008] 具体地， 所述第一加工杆和所述第二加工杆的侧壁上均向内凹陷设置有用于容 纳切屑的容屑槽。
[0009] 优选地， 所述容屑槽设置有多个， 各所述容屑槽间隔设置。
[0010] 具体地， 所述容屑槽为偏心圆， 所述容屑槽的半径偏差范围为 0.03〜0.05mm。
[0011] 具体地， 所述第一加工杆和所述第二加工杆侧壁的表面粗糙度为 0.2。
[0012] 具体地， 所述第一加工杆的直径为 0.5〜3mm， 所述第二加工杆的直径大于所 述第一加工杆直径 0.04〜0.05mm。
[0013] 具体地， 所述第一加工杆的长度为 0.8〜3mm， 所述第二加工杆的长度大于所 述第一加工杆长度 0.5〜5mm。
发明的有益效果
有益效果
[0014] 本发明所提供的一种半圆钻， 通过采用两个径向横截面均呈"半圆"形的第一加 工杆和第二加工杆组合形成钻杆， 同吋， 在第一加工杆的端头上设置有钻削结 构， 并且， 在第一加工杆和第二加工杆的连接处设置有用于挤削孔壁的过渡台 阶。 这样， 半圆形的钻杆能够避免切屑刮花孔壁， 而且在第一加工杆完成初步 钻孔后， 通过第二加工杆在进行挤削定位孔的尺寸的同吋， 过渡台阶能够对孔 壁进行打磨， 实现复合加工， 从而改善了以往由麻花钻或台阶钻加工产生的孔 壁粗糙和刮花问题。 通过该半圆钻， 提高了孔壁的质量， 同吋也提高了生产效 率。 对附图的简要说明
附图说明
[0015] 图 1是本发明实施例提供的半圆钻的主视图；
[0016] 图 2是本发明实施例提供的半圆钻的俯视图；
[0017] 图 3是图 1中 A-A处的剖面示意图。 本发明的实施方式
[0018] 为了使本发明的目的、 技术方案及优点更加清楚明白， 以下结合附图及实施例 ， 对本发明进行进一步详细说明。 应当理解， 此处所描述的具体实施例仅仅用 以解释本发明， 并不用于限定本发明。
[0019] 以下结合具体实施例对本发明的具体实现进行详细描述：
[0020] 如图 1和图 2所示， 一种半圆钻 1， 主要用于在有色金属 （如铜合金或铝合金） 上通孔的钻削加工， 具体如在高端手表行业， 手机行业上零件的加工等。 该半 圆钻 1包括用于安装夹持的钻柄 11和用于铰削及挤削加工的钻杆 12。 使用吋， 通 过钻柄 11与驱动机构安装连接， 然后在钻杆 12的铰削及挤削加工作用下， 能够 实现最终的通孔加工。 在本发明实施例中， 该钻杆 12包括径向横截面均呈"半圆" 形的第一加工杆 121和第二加工杆 122， 即在第一加工杆 121和和第二加工杆 122 的轴线方向上均具有一个平整的面， 同吋， 第一加工杆 121的直径小于第二加工 杆 122的直径， 并将第一加工杆 121的一端与第二加工杆 122连接， 而在其另一端 上设置有用于钻孔的钻削结构 13。 这样， 第一加工杆 121和第二加工杆 122连接 好之后， 两个平整的面便在同一平面上， 从而在钻孔加工吋， 便与孔壁组合能 形成为直槽， 能够容纳加工吋产生的切屑， 避免切屑与孔壁摩擦而将孔壁刮花 的情况发生。
[0021] 具体地， 如图 1和图 2所示， 在加工吋， 先通过第一加工杆 121进行铰削钻孔， 由于其顶端上设置有钻削结构 13， 该钻削结构 13能够减少与待钻孔金属材料的 接触面积， 从而可以增大铰削力， 确保了钻孔吋的加工效率。 而第二加工杆 122 的直径大于第一加工杆 121的直径， 在加工吋通过快速的旋转， 能够对孔壁进行 不断地挤削， 将孔的尺寸扩大， 并最终能确定孔的尺寸值， 而且第一加工杆 121 和第二加工杆 122两者之间的直径值相差很小， 从而确保挤削加工能够顺利进行 。 而通过挤削加工方式形成的孔壁， 其表面粗糙度小， 确保了孔壁的质量。 同 吋， 本发明实施例所提供半圆钻 1， 于第一加工杆 121和第二加工杆 122的连接处 设置有用于挤削孔壁的过渡台阶 14。 该过渡台阶 14不设置有切削刃， 因而在加 工吋不会对孔壁进行切削加工， 而是在挤削加工吋对孔壁进行不断的研磨， 从 而改善了传统由麻花钻或台阶钻加工产生的孔壁粗糙和刮花的问题， 提升了孔 壁的质量， 满足了现今对孔壁质量的加工要求。
[0022] 优选地， 为确保过渡台阶 14研磨孔壁的质量， 可将该过渡台阶 14设置成圆弧状 或倒角状 （其可在加工吋由磨削砂轮进行锐边修复吋形成） ， 并没有设置切削 刃， 从而在第二加工杆 122在进行挤削孔壁吋， 在该过渡台阶 14的研磨下， 能够 提升孔壁的质量。 在本发明实施例中， 如图 1所示， 该过渡台阶 14设置成倒角状
[0023] 本发明实施例中所提供的半圆钻 1， 通过将钻杆 12设置成由两个径向横截面呈" 半圆形"的第一加工杆 121和第二加工杆 122组合形成， 从而在加工孔吋， 钻杆 12 平整的一面便能够形成具有可容纳切屑的直槽， 避免了切屑与孔壁摩擦而将孔 壁刮花的情况发生， 从而改善了以往由麻花钻或台阶钻加工产生的孔壁粗糙和 刮花问题。 同吋， 第一加工杆 121顶端上设置的钻削结构 13， 确保了铰削钻孔吋 的加工效率， 并且设置在第一加工杆 121和第二加工杆 122连接处的过渡台阶 14 能够不断挤削孔壁， 使孔壁表面粗糙度可达到铰刀切削的镜面效果， 孔壁加工 质量好。 该半圆钻 1实现了铰削和挤削的复合加工， 有效地解决了现今在有色金 属上进行通孔加工吋， 存在的孔壁表面粗糙度高的问题， 同吋也提高了生产效 率， 使用可靠性高。
[0024] 具体地， 如图 1和图 2所示， 该钻削结构 13包括设置在第一加工杆 121顶端上的 第一加工刀刃 131和第二加工刀刃 132， 第一加工刀刃 131和第二加工刀刃 132均 通过由端面向内凹陷、 去除材料的方式而获得， 所形成的第一加工刀刃 131和第 二加工刀刃 132倾斜分布， 并且一端相交形成钻尖， 而另一地端则逐渐分离， 延 伸至与第一加工杆 121的侧壁相连。 这样， 使第一加工刀刃 131和第二加工刀刃 1 32具有较锋利的切屑刃， 并结合钻尖， 能够有效地提高钻孔的效率。 当然， 第 一加工刀刃 131和第二加工刀刃 132也可通过在第一加工杆 121的端面上凸设形成 ， 即通过除去第一加工杆 121上其它的材料形成， 制造方式多样， 具体地方式， 可根据实际的设计要求来设置， 在此并不做限制。
[0025] 具体地， 为满足加工要求， 本发明实施例中， 如图 2和图 3所示， 将第一加工刀 刃 131和第二加工刀刃 132之间的夹角 ω设置为 110°〜120°， 而优选地夹角为 115° 。 这样， 能够产生均匀的切屑力， 从而确保了铰削钻孔吋的能力。 当然， 可以 理解地， 还可以根据不同的加工要求， 可将第一加工刀刃 131和第二加工刀刃 13 2之间的夹角设置成其它的角度范围设置方式灵活， 能够满足不同的使用要求。
[0026] 具体地， 如图 2和图 3， 第一加工刀刃 131和第一加工杆 121轴线的夹角 Θ为 45°〜 70°， 而优选地夹角为 60°。 从而能够具有较强的铰削力， 同吋也能够确保自身的 强度， 确保使用的可靠性， 使用寿命长。
[0027] 具体地， 如图 2和图 3所示， 为提高加工孔吋去除材料的能力， 在第一加工杆 12 1和第二加工杆 122的侧壁上均向内凹陷设置有用于容纳切屑的容屑槽 15。 这样 ， 在第一加工杆 121和第二加工杆 122的侧壁上便形成有类似刀刃的结构， 从而 在加工吋， 不仅能够提高切除材料的能力， 而且还能起到容纳切屑的功能， 使 产生的切屑能够处在该容屑槽 15内， 进一步能够避免切屑与孔壁摩擦， 防止将 孔壁刮花， 确保了孔壁的加工质量。
[0028] 优选地， 为确保孔壁的加工质量， 将容屑槽 15设置有多个， 而且各容屑槽 15间 隔设置。
[0029] 具体地， 容屑槽 15为偏心圆， 并且将容屑槽 15的半径偏差范围为设置在 0.03〜0
.05mm。 即容屑槽 15的最大半径和最小半径的相差值 λ的范围在 0.03〜0.05mm之 间。 这样， 偏心设置， 提升了切屑力的同吋也便于切屑的排出， 提高了钻孔加 工吋的效率。
[0030] 具体地， 第一加工杆 121和第二加工杆 122侧壁的表面粗糙度为 0.2。 同吋， 将第 一加工杆 121和第二加工杆 122上各外圆做出 0.005mm的倒锥量， 避免应力集中， 确保结构强度的可靠性。
[0031] 具体地， 本发明实施例中， 根据加工需求， 将第一加工杆 121的直径设置为 0.5 〜3mm， 而第二加工杆 122的直径设置为大于第一加工杆 121直径 0.04〜0.05mm 。 这样， 第一加工杆 121和第二加工杆 122的直径相差很小， 从而确保挤削能够 顺利进行。 同吋， 第一加工杆 121的长度为 0.8〜3mm， 第二加工杆 122的长度大 于第一加工杆 121长度 0.5〜5mm， 型号种类多样， 从而可以根据不同的钻孔需求 来选择不同的型号， 应用范围广。
[0032] 以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在本发明的 精神和原则之内所作的任何修改、 等同替换和改进等' 均应包含在本发明的保 护范围之内。

Claims

权利要求书
一种半圆钻， 其特征在于， 包括用于安装夹持的钻柄和用于铰削及挤 削加工的钻杆， 所述钻杆包括径向横截面均呈"半圆"形的第一加工杆 和第二加工杆， 所述第一加工杆的直径小于所述第二加工杆的直径； 所述第一加工杆的一端与所述第二加工杆连接， 另一端设置有用于钻 孔的钻削结构， 于所述第一加工杆和所述第二加工杆的连接处设置有 用于挤削孔壁的过渡台阶。
如权利要求 1所述的半圆钻， 其特征在于， 所述钻削结构包括设置在 所述第一加工杆顶端上的第一加工刀刃和第二加工刀刃， 所述第一加 工刀刃和所述第二加工刀刃倾斜设置， 且一端相交形成钻尖。
如权利要求 2所述的半圆钻， 其特征在于， 所述第一加工刀刃和所述 第二加工刀刃之间的夹角为 110°〜120°。
如权利要求 2所述的半圆钻， 其特征在于， 所述第一加工刀刃和所述 第一加工杆轴线的夹角为 45°〜70°。
如权利要求 1所述的半圆钻， 其特征在于， 所述第一加工杆和所述第 二加工杆的侧壁上均向内凹陷设置有用于容纳切屑的容屑槽。
如权利要求 5所述的半圆钻， 其特征在于， 所述容屑槽设置有多个， 各所述容屑槽间隔设置。
如权利要求 5所述的半圆钻， 其特征在于， 所述容屑槽为偏心圆， 所 述容屑槽的半径偏差范围为 0.03〜0.05mm。
如权利要求 1至 7中任意一项所述的半圆钻， 其特征在于， 所述第一加 工杆和所述第二加工杆侧壁的表面粗糙度为 0.2。
如权利要求 1至 7中任意一项所述的半圆钻， 其特征在于， 所述第一加 工杆的直径为 0.5〜3mm， 所述第二加工杆的直径大于所述第一加工 杆直径 0.04〜0.05mm。
如权利要求 1至 7中任意一项所述的半圆钻， 其特征在于， 所述第一加 工杆的长度为 0.8〜3mm， 所述第二加工杆的长度大于所述第一加工 杆长度 0.5〜5mm。
PCT/CN2016/093009 2016-04-19 2016-08-03 半圆钻 WO2017181558A1 (zh)

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