WO2020082976A1 - 扁钻 - Google Patents

扁钻 Download PDF

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Publication number
WO2020082976A1
WO2020082976A1 PCT/CN2019/108124 CN2019108124W WO2020082976A1 WO 2020082976 A1 WO2020082976 A1 WO 2020082976A1 CN 2019108124 W CN2019108124 W CN 2019108124W WO 2020082976 A1 WO2020082976 A1 WO 2020082976A1
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WO
WIPO (PCT)
Prior art keywords
cutting
flat drill
longitudinal
flat
chip evacuation
Prior art date
Application number
PCT/CN2019/108124
Other languages
English (en)
French (fr)
Inventor
林洁
李晨鹰
任军
Original Assignee
博世电动工具（中国）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.)
Filing date
Publication date
Application filed by 博世电动工具（中国）有限公司 filed Critical 博世电动工具（中国）有限公司
Priority to EP19876079.5A priority Critical patent/EP3871816A4/en
Priority to AU2019367015A priority patent/AU2019367015B2/en
Publication of WO2020082976A1 publication Critical patent/WO2020082976A1/zh
Priority to US17/233,247 priority patent/US11638960B2/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/0095—Spade drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G15/00—Boring or turning tools; Augers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/899—Having inversely angled cutting edge

Definitions

  • the present application relates generally to flat drills, especially woodworking flat drills for cordless handheld power tools.
  • flat drill In the field of wood processing, flat drill is a relatively common tool. Generally, flat drills are installed on the chucks of power tools to quickly make holes in wood, and are especially widely used in, for example, wood house construction.
  • the flat drill is usually provided with a threaded guide for guiding the flat drill toward the wood before the cutting edge of the flat drill contacts the wood.
  • a threaded guide for guiding the flat drill toward the wood before the cutting edge of the flat drill contacts the wood.
  • the purpose of this application is to propose a flat drill suitable for cordless handheld power tools, so as to have a better nail cutting function.
  • a flat drill is provided, the flat drill includes:
  • a generally flat cutting chip evacuation portion provided axially from one end of the shank
  • a thread guide provided axially from one end of the cutting chip evacuation portion, the cutting chip evacuation portion has two longitudinal wings, the two longitudinal wings being relative to the longitudinal center axis of the flat drill It is rotationally symmetrically arranged, and each longitudinal wing is formed with a cutting edge at the end of the cutting chip evacuation portion where the thread guide is extended, which is generated by the cutting edge when the flat drill (100) rotates
  • the rotation trajectory surface of is inclined toward the shank and is at an angle with respect to the longitudinal central axis, the angle being in the range between 84 ° and 86 °.
  • the thread guide has a conical shape with an external thread, the root of the cone is connected to the guide, and the maximum diameter of the thread guide does not exceed the cutting edge around the longitudinal direction The outer diameter of the cutting surface formed when the center rotates axially.
  • the cone angle of the cone is between 23 ° and 29 °, preferably 26 °
  • the pitch of the external thread is between 1.2 mm and 1.3 mm, preferably 1.25 mm.
  • each longitudinal wing At least a part is formed in such a manner that the width gradually widens radially outward from the longitudinal center axis.
  • a concave portion radially inward is formed at the root of the cone and upstream of one cutting edge along the cutting rotation side of the flat drill to ensure that it is outside the guide portion After the thread is cut, the cutting edge is cut immediately.
  • the two longitudinal wings define two longitudinal grooves diametrically opposite to each other in the cutting chip evacuation portion.
  • the two cutting edges are collinear and pass through the longitudinal center axis.
  • the cutting chip evacuation part is provided integrally with the shank body, and / or the thread guide part is provided with the cutting chip evacuation part integrally.
  • each longitudinal wing is provided in a flat shape tapering from the shank toward the thread guide and defines a chip flute in the cutting chip evacuation part.
  • a cordless hand-held power tool is also provided, and the aforementioned flat drill is detachably installed in a collet of the cordless hand-held power tool.
  • the technical means of this application are used to minimize the possibility of the cutting edge of the flat drill breaking due to cutting nails in wood processing.
  • the design of the thread guide is optimized for the motor torque characteristics of the cordless handheld power tool, which improves Drilling efficiency.
  • FIG. 1 schematically shows a perspective view of a flat drill according to an embodiment of the present application
  • FIG. 2 schematically shows an axial side view of the flat drill of FIG. 1;
  • Fig. 3 schematically shows an axial side view of a part of a flat drill, in particular a threaded guide
  • Fig. 4 schematically shows an axial end view looking from the side of the thread guide of the flat drill toward the flat drill;
  • Fig. 5 schematically shows a cross-sectional view of a flat drill taken along section A-A in Fig. 1.
  • FIG. 1 schematically shows a perspective view of a flat drill 100 according to an embodiment of the present application.
  • the flat drill 100 generally includes a shank body 10, a cutting chip evacuation portion 20 which is axially arranged from one end of the shank body 10, preferably integrally arranged in the axial direction, and an end edge of the cutting chip evacuation portion 20 opposite to the shank body 10
  • An axially provided screw guide 30 is preferably provided integrally in the axial direction.
  • the flat drill 100 is integrally formed of a high-strength metal such as an alloy.
  • the shank body 10 is provided with a clamping portion that can be mounted on a chuck of a power tool, especially a cordless handheld power tool (not shown), for example, the end of the shank body 10 opposite to the cutting chip evacuation portion 20 is hexagonal in order to After the flat drill 100 is fixed in place on the chuck, driven by the motor of the power tool, it rotates around its longitudinal central axis to perform wood hole drilling.
  • a power tool especially a cordless handheld power tool (not shown)
  • the end of the shank body 10 opposite to the cutting chip evacuation portion 20 is hexagonal in order to After the flat drill 100 is fixed in place on the chuck, driven by the motor of the power tool, it rotates around its longitudinal central axis to perform wood hole drilling.
  • FIG. 2 schematically shows an axial side view of the flat drill 100.
  • the thread guide 30 is located upstream of the cutting chip evacuation part 20.
  • the thread guide portion 30 is substantially conical with an external thread, and the root of the conical shape is connected to the cutting chip evacuation portion 20.
  • the thread guide 30 rotates under the drive of the motor of the power tool, under the action of the longitudinal pressing force, the thread guide 30 is screwed into the wood, and under the guidance of the thread of the guide 30, the rotary cutting The chip removing part 20 is driven to move toward the wood.
  • the outermost boundary (point) of the thread of the guide 30 is formed
  • the angle ⁇ between the straight lines is between 23 ° and 29 °, preferably 26 °.
  • the taper of the guide portion 30 extends from its free end to the cutting chip evacuation portion 20.
  • the thread pitch of the guide portion 30 should be 1.25 mm.
  • the cutting chip evacuation portion 20 is generally flat and has two cutting edges 21a.
  • each cutting edge 21 a is defined by a cutting plane 21 at the free end of the cutting chip evacuation section 20 from which the guide section 30 extends, so that the end from the guide section 30 Observe (as shown in FIG. 4) that as the flat drill 100 rotates in the circumferential direction (ie, the cutting rotation direction) R, the cutting edge 21a can always be contacted in the cutting rotation direction R before the other parts of the corresponding cutting chip ejector 20 Wood to be processed.
  • the flat drill 100 As viewed in the axial side view of the flat drill 100 shown in FIG.
  • the cutting edge 21 a is inclined toward the downstream direction, that is, toward the shank 10 at an angle ⁇ relative to the longitudinal center axis O of the flat drill 100.
  • the angle réelle is in the range between 84 ° and 86 °.
  • the longitudinal center axes of the shank 10, the cutting chip evacuation portion 20, and the guide portion 30 of the flat drill 100 are collinear, and are all the longitudinal center axes O.
  • the maximum diameter of the conical guide portion 30 should not exceed the outer diameter of the cutting surface formed when the cutting edge 21a rotates around the longitudinal center axis O.
  • the two cutting edges 21 a are mirror-symmetric with respect to the longitudinal center axis O.
  • the rotation locus surface formed by the cutting edge 21a is inclined at an angle ⁇ toward the downstream direction, that is, toward the shank 10.
  • the portion of the cutting edge 21a near the longitudinal center axis O ie, the radius from the longitudinal center axis O is smaller
  • Part First contact with the nail, so that the blocking torque generated when colliding with the nail is smaller, and the destructive force to the cutting edge 21a is smaller, which helps protect the integrity of the cutting edge 21a.
  • the two cutting edges 21a are straight. As viewed in the axial end view (FIG. 4), the cutting edges 21a are collinear and pass through the longitudinal center axis O of the flat drill 100. Starting from the cut surface 21, the cutting chip evacuation portion 20 uniformly extends to the shank body 10 in the downstream direction. The cutting chip evacuation portion 20 is provided with two longitudinal grooves 22 that are diametrically opposite to each other with respect to the longitudinal center axis O.
  • FIG. 5 shows a cross-sectional view of the cutting chip evacuation portion 20 of the flat drill 100, the cross-section of which is taken perpendicular to the longitudinal center axis O.
  • the cutting chip evacuation portion 20 is formed by two longitudinal wings 23, wherein the two longitudinal wings 23 are disposed rotationally symmetrically with respect to the longitudinal center axis O.
  • the term "longitudinal" in each longitudinal wing means that the wing is distributed along the longitudinal center axis of the spade 100, which can be formed in any well-known manner by those skilled in the art.
  • the cutting surface 21 defining the cutting edge 21 a is formed at each longitudinal wing portion 23 at the end of the cutting chip evacuation portion 20 where the thread guide 30 extends.
  • Each longitudinal wing is provided in a flat shape that tapers from the shank toward the thread guide.
  • Longitudinal grooves 22, ie chip flutes are respectively defined on two sides of the two longitudinal wings 23 which are diametrically opposite to each other.
  • each longitudinal wing 23 gradually shrinks from the outside to the inside in the radial direction. At least a portion of each longitudinal wing 23 is formed in such a manner that the width gradually widens radially outward from the longitudinal center axis O. In this way, the strength of the cutting edge 21a near the radial boundary is strengthened, so that even if the cutting edge 21a hits a nail at a distance away from the longitudinal center axis O, the corresponding enhanced structure of the longitudinal wing 23 causes the cutting edge 21a Not easy to break.
  • the shape of the cutting chip evacuation portion 20 or its longitudinal wing portion 23 is not limited to that shown in the figure, and any shape that can gradually thicken the longitudinal wing portion 23 from inside to outside in the radial direction can Used in this application.
  • the cutting edge 21a of the cutting chip removal portion 20 In order to make the cutting operation of the flat drill 100 smoothly transition from the thread of the guide portion 30 to the cutting edge 21a of the cutting chip removal portion 20, that is, to cut the thread of the guide portion in the wood when the flat drill 100 rotates At the end, the cutting edge 21a continues to cut into the wood without hindrance, and a radially inward concave cutout 40 is formed between the root of the guide portion 30 and the cutting edge 21a of the cutting chip 20, so that the flat drill When cutting is performed at 100 rotations, the cutting edge 21a of the chip removal part 20 is cut immediately after the thread cutting of the guide part 30 is completed. In this way, the flat drill 100 can be guided and moved in the wood by the guide portion 30 at the initial stage, and then smoothly cut by the cutting edge 21a.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Drilling Tools (AREA)

Abstract

一种扁钻(100)，所述扁钻(100)包括：柄身(10)；自所述柄身(10)的一个端部沿轴向设置的总体呈扁平状的切削排屑部(20)；以及自所述切削排屑部(20)的一个端部沿轴向设置的螺纹引导部(30)，所述切削排屑部(20)具有两个纵向翼部(23)，所述两个纵向翼部(23)相对于所述扁钻(100)的纵向中心轴线(O)旋转对称设置，并且每个纵向翼部(23)在所述切削排屑部(20)的延伸有所述螺纹引导部(30)的端部处形成有切削刃(21a)，由所述切削刃(21a)在所述扁钻(100)旋转时产生的旋转轨迹面朝向所述柄身(10)倾斜并相对于所述纵向中心轴线(O)为一角度，该角度是在84°与86°之间的范围内。该扁钻在碰撞时产生的扭矩较小，有助于保护切削刃的完整性。

Description

扁钻 技术领域
本申请大体上涉及扁钻、特别是用于无绳手持电动工具的木工扁钻。
背景技术
在木料加工领域，扁钻是一种比较常见的工具。通常，扁钻被安装在电动工具的夹头上，用于在木料中快速开孔，特别是在诸如木材房屋建设中被广泛使用。
例如，在木材房屋的建造过程中，在木料上进行开孔之前，木料中会残留有看不见的连接钉子。在这种情况下，扁钻的切削刃非常有可能打到钉子上，造成刃口断裂影响使用。
另外，扁钻通常设有螺纹引导部，用于在扁钻的切削刃未接触木料之前引导扁钻朝向木料前进。对于无绳手持电动工具而言，因其是通过电池供电，所以电动工具的电机的功率和所能提供的扭矩有限。在这种情况下，如何在电机扭矩与扁钻引导速度之间进行协调是一个关键的问题。
发明内容
本申请旨在提出一种适用于无绳手持电动工具的扁钻，从而具有更好的切钉功能。
根据本申请的一个方面，提供了一种扁钻，所述扁钻包括：
柄身；
自所述柄身的一个端部沿轴向设置的总体呈扁平状的切削排屑部；以及
自所述切削排屑部的一个端部沿轴向设置的螺纹引导部，所述切削排屑部具有两个纵向翼部，所述两个纵向翼部相对于所述扁钻的纵向中心轴线旋转对称设置，并且每个纵向翼部在所述切削排屑部的延 伸有所述螺纹引导部的端部处形成有切削刃，由所述切削刃在所述扁钻(100)旋转时产生的旋转轨迹面朝向所述柄身倾斜并相对于所述纵向中心轴线为一角度，该角度是在84°与86°之间的范围内。
可选地，所述螺纹引导部呈带有外螺纹的圆锥形，所述圆锥形的根部与所述引导部相连，并且所述螺纹引导部的最大直径不超过所述切削刃绕所述纵向中心轴向旋转时所形成的切削面的外径。
可选地，所述圆锥形的锥角是在23°与29°之间，优选是26°，并且所述外螺纹的螺距是在1.2毫米与1.3毫米之间，优选是1.25毫米。
可选地，在所述切削排屑部的延伸有所述螺纹引导部的端部与所述柄身之间的一个垂直于所述纵向中心轴线的横截面中观察，每个纵向翼部的至少一部分以从纵向中心轴线径向向外宽度逐渐加宽的方式被形成。
可选地，在所述圆锥形的根部处且在沿着所述扁钻的切削旋转方在一个切削刃的上游形成有一径向向内的凹切部，以确保在所述引导部的外螺纹结束切削后紧接着该切削刃进行切削。
可选地，所述两个纵向翼部在所述切削排屑部中限定了两个彼此径向相反的纵向凹槽。
可选地，在所述扁钻的轴向端视图中观察，所述两个切削刃共直线，且经过所述纵向中心轴线。
可选地，所述切削排屑部与所述柄身一体设置，和/或所述螺纹引导部与所述切削排屑部一体设置。
可选地，每个纵向翼部呈自所述柄身朝向所述螺纹引导部的方向渐缩的扁平形状方式设置并在所述切削排屑部中限定排屑槽。
根据本申请的另一个方面，还提供了一种无绳手持电动工具，在所述无绳手持电动工具的夹头中可拆卸地安装有前述的扁钻。
采用本申请的技术手段，尽量减小了扁钻的切削刃在木料加工中因切钉而断裂的可能性，另外针对无绳手持电动工具的电机扭矩特性优化了螺纹引导部的设计，提高了扁钻的使用效率。
附图说明
从后述的详细说明并结合下面的附图将能更全面地理解本申请的前述及其它方面。需要指出的是，各附图的比例出于清楚说明的目的有可能不一样，但这并不会影响对本申请的理解。在附图中：
图1示意性示出了根据本申请的实施例的扁钻的立体图；
图2示意性示出了图1的扁钻的轴向侧视图；
图3示意性示出了扁钻的一部分、特别是螺纹引导部的轴向侧视图；
图4示意性示出了从扁钻的螺纹引导部的一侧朝向扁钻看过去的轴向端视图；并且
图5示意性示出了沿图1中的截面A-A所截取的扁钻的横截面图。
具体实施方式
在本申请的各附图中，结构相同或功能相似的特征由相同的附图标记表示。
图1示意性示出了根据本申请的实施例的扁钻100的立体图。扁钻100大体上包括柄身10、从柄身10一端沿轴向设置的、优选沿轴向一体设置的切削排屑部20、以及从切削排屑部20的与柄身10相反的一端沿轴向设置的、优选沿轴向一体设置的螺纹引导部30。扁钻100由高强度金属例如合金一体形成。柄身10设有能够在电动工具、特别是无绳手持电动工具(未示出)的夹头上安装的夹持部分，例如柄身10的与切削排屑部20相反的一端呈六角形，以便扁钻100在夹头上固定就位后，在电动工具的电机带动下绕其纵向中心轴线旋转，以便进行木料开孔加工。
图2示意性示出了扁钻100的轴向侧视图。沿着扁钻100在木料中进行加工钻入的方向，螺纹引导部30位于切削排屑部20的上游。具体参看图3，螺纹引导部30基本上呈带有外螺纹的圆锥形，所述圆锥形的根部与所述切削排屑部20相连。在扁钻100安装到电动工具上用于在木料上开孔时，螺纹引导部30首先接触木料表面，目的是对待开孔的位置进行定位。然后，随着螺纹引导部30在电动工具的电机驱动下旋转，在纵向按压力的作用下，螺纹引导部30旋入到木料内，并 在引导部30的螺纹的引导作用下，旋转的切削排屑部20被带动朝向木料移动。
如图3所示，在扁钻100的轴向侧视图中或者说在经过纵向中心轴线O的扁钻100的纵向剖切面中，引导部30的螺纹的最外边界(点)所连成的直线之间的角度θ是在23°与29°之间，优选是26°。此外，在轴向侧视图中观察，引导部30的锥形从其自由末端延伸直至切削排屑部20。另外，为了确保无绳手持电动工具的电机能够为引导部30提供足够的扭矩并且确保扁钻100在开孔初期具有足够的推进速度，引导部30的螺纹的螺距应为1.25毫米。
切削排屑部20总体呈扁平状，具有两个切削刃21a。在本申请中，切削排屑部20虽然呈扁平状但其横截面也会沿着纵向中心轴线发生变化。从图2和4可以看出，每个切削刃21a由位于切削排屑部20的自由端部(引导部30自该端部延伸)处的一个切面21限定，以使得在从引导部30端观察(如图4所示)，随着扁钻100沿着圆周方向(即切削旋转方向)R旋转，切削刃21a总是能够在切削旋转方向R先于对应切削排屑部20的其它部分接触待加工的木料。在如图2所示的扁钻100的轴向侧视图中观察，切削刃21a朝向下游方向、即朝向柄身10以一相对于扁钻100的纵向中心轴线O的角度а倾斜。该角度а是在84°与86°之间的范围内。在本申请中，扁钻100的柄身10、切削排屑部20和引导部30的纵向中心轴线共线，均为该纵向中心轴线O。本领域技术人员应当清楚，圆锥形引导部30的最大直径应当不超过切削刃21a绕纵向中心轴向O旋转时所形成的切削面的外径。
优选地，在图2中，两个切削刃21a相对于纵向中心轴线O镜像对称。随着扁钻100的旋转，由切削刃21a所形成的旋转轨迹面朝向下游方向、即朝向柄身10以角度а倾斜。这样，当切削排屑部20在木料中进行开孔切削时，如果木料中存在钉子的话，总是切削刃21a的靠近纵向中心轴线O的部分(即，距离纵向中心轴线O的半径较小的部分)先接触钉子，由此在与钉子碰撞时所产生的阻挡扭矩较小，对切削刃21a的破坏力就较小，有助于保护切削刃21a的完整性。
两个切削刃21a呈直线。在轴向端视图(图4)中观察，切削刃 21a共直线并经过扁钻100的纵向中心轴线O。从切面21开始，切削排屑部20沿着下游方向一致延伸到柄身10。切削排屑部20设有相对于纵向中心轴线O的两个彼此径向相反的纵向凹槽22。图5示出了扁钻100的切削排屑部20的横截面图，其横截面是由垂直于纵向中心轴线O所截取的。可以看出，切削排屑部20由两个纵向翼部23所形成，其中这两个纵向翼部23相对于纵向中心轴线O旋转对称地设置。在本申请的上下文中，每个纵向翼部中的术语“纵向”意味着该翼部沿着扁钻100的纵向中心轴线分布，其能够以本领域技术人员任何熟知的方式被形成。限定切削刃21a的切面21在每个纵向翼部23在切削排屑部20的延伸有螺纹引导部30的端部形成。每个纵向翼部呈自所述柄身朝向所述螺纹引导部的方向渐缩的扁平形状方式设置。纵向凹槽22、即排屑槽分别在这两个纵向翼部23的彼此径向相反的两侧限定。
纵向凹槽22的作用是为切削刃21a在木料中开孔时产生的碎屑提供排出功能。另外，从横截面可以看出，每个纵向翼部23在径向的方向上从外向内逐渐收缩。每个纵向翼部23的至少一部分以从纵向中心轴线O径向向外宽度逐渐加宽的方式被形成。这样，切削刃21a在径向边界附近的强度得到加强，从而即使切削刃21a的在远离纵向中心轴线O处碰到钉子，因其所对应的纵向翼部23的加强的构造，导致切削刃21a不易破损。本领域技术人员应当清楚，切削排屑部20或其纵向翼部23的形状并不限于如图所示，任何能够使得纵向翼部23沿着径向从内向外逐渐加厚的形状均可以在本申请中采用。
为了使得扁钻100在使用时切削作用从其引导部30的螺纹顺利地过渡到切削排屑部20的切削刃21a，也就是说，为了在扁钻100旋转时引导部的螺纹在木料内切削结束时没有阻碍地由切削刃21a继续在木料内切削，在引导部30的根部与切削排屑部20的切削刃21a之间形成有径向向内的凹切部40，以使得在扁钻100旋转进行切削时，在引导部30的螺纹切削结束之后紧随着是切削排屑部20的切削刃21a进行切削。这样，可以使得扁钻100在初期由引导部30在木料中引导移动，然后顺畅地利用切削刃21a进行切削。
在本申请的上下文中，各实施例可以任意彼此相互结合。尽管这 里详细描述了本申请的特定实施方式，但它们仅仅是为了解释的目的而给出的，而不应认为它们对本申请的范围构成限制。在不脱离本申请精神和范围的前提下，各种替换、变更和改造可被构想出来。

Claims (11)

  1. 一种扁钻(100)，其特征在于，所述扁钻(100)包括：
    柄身(10)；
    自所述柄身(10)的一个端部沿轴向设置的总体呈扁平状的切削排屑部(20)；以及
    自所述切削排屑部(20)的一个端部沿轴向设置的螺纹引导部(30)，所述切削排屑部(20)具有两个纵向翼部(23)，所述两个纵向翼部(23)相对于所述扁钻(100)的纵向中心轴线(O)旋转对称设置，并且每个纵向翼部(23)在所述切削排屑部(20)的延伸有所述螺纹引导部(30)的端部处形成有切削刃(21a)，由所述切削刃(21a)在所述扁钻(100)旋转时产生的旋转轨迹面朝向所述柄身(10)倾斜并相对于所述纵向中心轴线(O)为一角度(а)，该角度是在84°与86°之间的范围内。
  2. 根据权利要求1所述的扁钻(100)，其特征在于，所述螺纹引导部(30)呈带有外螺纹的圆锥形，所述圆锥形的根部与所述切削排屑部(20)相连，并且所述螺纹引导部(30)的最大直径不超过所述切削刃(21a)绕所述纵向中心轴向(O)旋转时所形成的切削面的外径。
  3. 根据权利要求2所述的扁钻(100)，其特征在于，所述圆锥形的锥角(θ)是在23°与29°之间，并且所述外螺纹的螺距是在1.2毫米与1.3毫米之间。
  4. 根据权利要求2所述的扁钻(100)，其特征在于，所述圆锥形的锥角(θ)是26°，和/或，所述外螺纹的螺距是1.25毫米。
  5. 根据权利要求1至4任一所述的扁钻(100)，其特征在于，在所述切削排屑部(20)的延伸有所述螺纹引导部(30)的端部与所述 柄身(10)之间的一个垂直于所述纵向中心轴线(O)的横截面中观察，每个纵向翼部(23)的至少一部分以从纵向中心轴线(O)径向向外宽度逐渐加宽的方式被形成。
  6. 根据权利要求2至4任一所述的扁钻(100)，其特征在于，在所述圆锥形的根部处且在沿着所述扁钻(100)的切削旋转方(R)在一个切削刃(21a)的上游形成有一径向向内的凹切部(40)，以确保在所述引导部(30)的外螺纹结束切削后紧接着该切削刃(21a)进行切削。
  7. 根据权利要求5所述的扁钻(100)，其特征在于，所述两个纵向翼部(23)在所述切削排屑部(20)中限定了两个彼此径向相反的纵向凹槽(22)。
  8. 根据权利要求1至4任一所述的扁钻(100)，其特征在于，在所述扁钻(100)的轴向端视图中观察，所述两个切削刃(21a)共直线，且经过所述纵向中心轴线(O)。
  9. 根据权利要求1至4任一所述的扁钻(100)，其特征在于，所述切削排屑部(20)与所述柄身(10)一体设置，和/或所述螺纹引导部(30)与所述切削排屑部(20)一体设置。
  10. 根据权利要求1至4任一所述的扁钻(100)，其特征在于，每个纵向翼部(23)呈自所述柄身(10)朝向所述螺纹引导部(30)的方向渐缩的扁平形状方式设置并在所述切削排屑部(20)中限定排屑槽。
  11. 一种无绳手持电动工具，其特征在于，在所述无绳手持电动工具的夹头中安装有根据权利要求1至10任一所述的扁钻(100)。
PCT/CN2019/108124 2018-10-26 2019-09-26 扁钻 WO2020082976A1 (zh)

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