WO2017076092A1 - 用于 pcb 板钻孔的钻头 - Google Patents

用于 pcb 板钻孔的钻头 Download PDF

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Publication number
WO2017076092A1
WO2017076092A1 PCT/CN2016/093911 CN2016093911W WO2017076092A1 WO 2017076092 A1 WO2017076092 A1 WO 2017076092A1 CN 2016093911 W CN2016093911 W CN 2016093911W WO 2017076092 A1 WO2017076092 A1 WO 2017076092A1
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WIPO (PCT)
Prior art keywords
groove
width
spiral groove
drill bit
drilling
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PCT/CN2016/093911
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English (en)
French (fr)
Inventor
郭强
付连宇
Original Assignee
深圳市金洲精工科技股份有限公司
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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 WO2017076092A1 publication Critical patent/WO2017076092A1/zh

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B51/00Tools for drilling machines
    • B23B51/02Twist drills
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B2251/00Details of tools for drilling machines
    • B23B2251/40Flutes, i.e. chip conveying grooves
    • B23B2251/408Spiral grooves

Definitions

  • the present invention belongs to the technical field of drill bit structures, and more particularly to a drill bit for drilling a PCB board.
  • PCB printed circuit board
  • Japanese scholar Xing Xingyi has adopted a method of changing the helix angle and tapping the core taper to provide a hole drill with a small hole diameter of 0.4 mm or less, which is excellent in hole position accuracy, and has excellent practicability. Hole tool.
  • the above design for the micro-drill structure parameters has not yet got rid of the traditional design concept.
  • the optimization of the traditional drill bit parameters has caused a bottleneck in the improvement of the drilling performance, and it is necessary to start from the overall structure of the drill bit and carry out structural improvement.
  • Yuki Hideo proposed a new structural drill with a non-central symmetry of the double flutes relative to the center of rotation.
  • the first chip flute is used to ensure the wall thickness (rigidity) structure.
  • the main cutting edge of the drill bit There is also only one, the other chip flute is non-centralally offset with respect to the first flute, does not form the main cutting edge, does not have a cutting action, and its groove length is smaller than the first flute groove length.
  • the wind is arranged by providing one main flute and one or more auxiliary flutes, wherein the auxiliary flutes are in the 50% ⁇ 95 ⁇ 3 ⁇ 4 part of the main flute length and the main row
  • the flute connection setting enables stable drilling.
  • the asymmetric design of the double spiral groove relative to the center and the intersection of the middle and rear spiral grooves have an adverse effect on the drilling hole accuracy and the cuttings discharge.
  • Asymmetric design Because the tip of the drill is offset, the boring is prone to yaw, and chip clogging is prone to occur in the blind groove, resulting in excessive cutting temperatures and severe wear on the edge of a single main cutting edge.
  • the front end of the bit meets easily due to insufficient rigidity, resulting in low hole position accuracy, and the chip removal at the two-slot intersection is likely to cause congestion, and the chips are not easily discharged, which affects the processing quality of the hole.
  • the object of the present invention is to overcome the above-mentioned deficiencies of the prior art, and to provide a drill bit for drilling a PCB board, which has good rigidity, easy chip discharge, and high hole machining precision.
  • the technical solution of the present invention is: a drill bit for drilling a PCB board, comprising a body, one end of the body is a drill tip, and the body is provided with a groove width from one end of the drill tip to the other end.
  • the outer side of the body is provided with a long spiral groove and a short spiral groove which are spirally wound and do not meet, and the short spiral groove and the short spiral groove are constant in the groove width ratio.
  • the groove width ratio is constant, and the long spiral groove and the short spiral groove alternately change in the groove width ratio of the groove width to the constant groove, and the groove width is connected to the short spiral groove of the constant segment to be misaligned with the short spiral groove The wrong slot.
  • the groove width is alternately changed, the long spiral groove and the short spiral groove have alternating first width and second width, and the first width is greater than the first Two widths; the groove width is constant, the long spiral groove and the short spiral groove have a constant width, and the second width is greater than 0 mm and smaller than the constant width.
  • the length of the groove width is greater than the length of the constant section and is less than 50% of the long spiral groove.
  • the groove width ratio of the groove width to the constant segment is greater than or equal to 1; and the groove width ratio of the groove width to the alternating segment is greater than 1.
  • the wrong slot is engaged with the short spiral groove, and the groove width of the wrong groove is equal to or larger than the groove width of the short spiral groove.
  • the width of the groove width of the wrong groove and the width of the groove width of the short spiral groove are greater than
  • the core has a taper thickness equal to or greater than a core taper of the long spiral groove.
  • the wrong groove is parallel to the long spiral groove, and the groove width of the wrong groove is equal to or smaller than the groove width of the long spiral groove.
  • the short spiral groove and the wrong groove have a clear boundary line.
  • the slot length of the short spiral groove is greater than or equal to the drill bit UC segment.
  • the long spiral groove and the short spiral groove have a constant groove ratio of the groove width to the constant section, and the long spiral groove and the short spiral groove are The groove width alternates with a groove width ratio of the constant section, and the groove width is connected with a short spiral groove of the constant section to be offset from the short spiral groove.
  • the double spiral groove non-intersection design is adopted.
  • the ratio of the groove width is alternately changed, the double groove is independently discharged, the chips are not easily blocked, the cutting temperature can be controlled in a lower range, and the spiral groove cross section can be increased.
  • the area of the solid and the taper of the core thickness increase the bending strength of the drill bit, the machining accuracy of the hole position is high, and the machining quality of the drilling hole is good.
  • Figure 5 (a) is a schematic cross-sectional view of B-B in Figure 4;
  • Figure 5 (b) is a schematic cross-sectional view of A-A in Figure 4.
  • Figure 5 (c) is a schematic cross-sectional view of C-C in Figure 4.
  • Fig. 6 is a plan view showing a drill bit for drilling a PCB board having a spiral groove width profile according to an embodiment of the present invention.
  • a drill bit for drilling a PCB board includes a body 10, one end of the body 10 is a drill tip, and the body 10 is self-described.
  • One end of the drill tip is sequentially provided with a groove width constant section L1 and a groove width ratio alternating section L2, and the outer side of the body 10 is provided with a long spiral groove 101 and a short spiral groove 102 which are spirally wound and do not meet,
  • the ratio of the groove width of the long spiral groove 101 and the short spiral groove 102 to the groove width constant section L1 is constant, and the ratio of the groove width of the long spiral groove 101 and the short spiral groove 102 to the groove width is constant.
  • the groove width is smaller than the short spiral groove 102 of the constant segment L1, and the groove 103 is misaligned with the short spiral groove 102.
  • the double spiral groove non-intersection design is adopted.
  • the ratio of the groove width is alternately changed, the double groove is independently chipped, the chips are not easily blocked, the cutting temperature can be controlled in a lower range, and the spiral groove cross-section entity can be increased.
  • the area and the thickness of the core increase the bending strength of the drill bit, the machining accuracy of the hole position is high, and the machining quality of the drilling hole is good.
  • the long spiral groove 101 and the short spiral groove 102 have alternating first width wl and second width w2, and the first width
  • the width wl is greater than the second width w2.
  • the long spiral groove 101 and the short spiral groove 102 have a constant width w3.
  • w4 is the groove width.
  • the second width w2 is greater than 0 mm and less than the constant width w3.
  • the first width wl can be greater than or equal to the constant width w3, and the drill has good bending strength and good chip removal effect.
  • the groove width is longer than the length of the constant section L1 and is less than 50% of the long spiral groove 101 or the short spiral groove 102, and the bit has good bending strength and good chip removal effect.
  • the groove width ratio of the groove width to the constant segment L1 is greater than or equal to 1; the groove width ratio of the groove width to the alternating change segment L 2 is greater than 1, and is improved under the condition of ensuring the bending strength of the drill bit. Chip removal effect.
  • the wrong groove 103 is engaged with the short spiral groove 102, and the groove width of the wrong groove 103 is equal to or larger than the groove width of the short spiral groove 102 to improve the processing quality.
  • the center of the groove width of the offset groove 103 and the center of the groove width of the short spiral groove 102 have a width greater than 0 and less than 0.8 times the groove width of the short spiral groove 102.
  • the core groove of the wrong groove 103 is equal to or larger than the core thickness taper of the long spiral groove 101, the core thickness value is small, the spiral groove is large, and the taper is thick, and the core thickness taper is the drill tip.
  • the core thickness is divided by the core thickness at the end of the groove.
  • the wrong groove 103 is parallel to the long spiral groove 101, and the groove width of the wrong groove 103 is equal to or It is smaller than the groove width of the long spiral groove 101.
  • the short spiral groove 102 and the wrong groove 103 have a clear boundary line.
  • the slot length of the short spiral groove 102 is greater than or equal to the drill bit UC segment.
  • the long spiral groove 101 and the short spiral groove 102 may be ground first, and then the short spiral groove 102 may be continued to the long spiral groove 101 groove length by the wrong groove 103. Then the drill bit sharpens, the drill bit grinds back and cuts the UC.
  • the drill bit for drilling a PCB board has a groove width ratio of the long spiral groove 101 and the short spiral groove 102 to the groove width constant section L1, the long spiral The groove 101 and the short spiral groove 102 alternately change in the groove width ratio of the groove width constant section L1, and the groove width is connected to the short spiral groove 102 of the constant section L1 with a wrong groove which is offset from the short spiral groove 102. 103.
  • the double spiral groove non-intersection design is adopted.
  • the ratio of the groove width is alternately changed, the double groove is independently chipped, the chips are not easily blocked, the cutting temperature can be controlled in a lower range, and the spiral groove cross-section entity can be increased.
  • the area and the thickness of the core increase the bending strength of the drill bit, the machining accuracy of the hole position is high, and the machining quality of the drilling hole is good.

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

Abstract

一种用于PCB板钻孔的钻头,包括本体(10),本体(10)的一端为钻尖,本体(10)自钻尖一端向另一端依次设置有沟幅比恒定段和沟幅比交替变化段,本体的外侧设置有螺旋环绕且不交汇的长螺旋槽(101)和短螺旋槽(102),长螺旋槽(101)和短螺旋槽(102)于沟幅比恒定段的沟幅比恒定,长螺旋槽(101)和短螺旋槽(102)于沟幅比交替变化段的沟幅比交替变化,沟幅比交替变化段的短螺旋槽连接有与短螺旋槽错开的错槽。这种PCB板钻孔的钻头采用了双螺旋槽不交汇设计,在钻头后段中,沟幅比值交错变化,双槽独立排屑,切屑不易堵塞,切削温度可控制在较低范围,而且可以增加螺旋槽横截面实体的面积和芯厚锥度,提高了钻头抗弯强度,孔位加工精度高,钻孔的加工质量佳。

Description

用于 PCB板钻孔的钻头
技术领域
[0001] 本发明属于钻头结构技术领域, 尤其涉及一种用于 PCB板钻孔的钻头。
背景技术
[0002] 目前电子设备主板尺寸变得越来越小, 芯片高度集成且布置愈发密集, 这对连 接芯片引脚的印制电路板 (PCB板) 孔的位置精度提出了更高的要求。 不同设计 者对于提高 PCB微钻的钻孔精度有多重角度和方式, 而设计者普遍认为, 对于微 钻, 钻孔的孔位精度主要取决于钻头的刚度, 具体地, 有横截面形状、 钻芯厚 度、 螺旋槽角度和刃沟长度等影响刚度的因素。
[0003] 日本学者星幸义采用变螺旋角、 变钻芯锥度的方法, 提供了一种即使是 0.4mm 以下的小径钻头也能够实现孔位置精度良好的孔加工, 且实用性极其优秀的幵 孔工具。 上述对于微钻结构参数的设计依然未摆脱传统的设计理念。 而传统的 钻头参数优化对钻削性能的提升已然出现瓶颈, 需要从钻头整体结构着手, 进 行结构改进。
[0004] 涌井秀夫提出了一种双排屑槽相对于旋转中心非中心对称性的新结构钻头, 通 过形成第一个排屑槽来确保壁厚 (刚性) 的结构, 当然钻头的主切削刃也只有 一个, 另一个排屑槽相对于第一个排屑槽非中心对称偏置设置, 不形成主切削 刃, 不起切削作用, 且其槽长小于第一排屑槽槽长。 风间悠作通过设置 1个主排 屑槽和 1个以上的副排屑槽, 所述副排屑槽在所述主排屑槽的槽长的 50%〜95<¾ 部分与所述主排屑槽连接设置, 能够实现稳定的钻孔加工。 但是双螺旋槽相对 中心的非对称设计和中后段螺旋槽交汇设计均对钻削吋孔位精度和钻屑排出有 不利影响。 非对称设计因为钻尖质心偏移, 钻削吋容易发生偏摆, 并且盲槽内 容易发生排屑阻塞, 造成切削温度过高, 单个主切削刃刃口磨损严重。 而中后 段螺旋槽交汇设计, 其钻头交汇前端容易因刚度不足, 导致孔位精度低, 并且 双槽交汇处排屑容易造成拥堵, 切屑不容易排出, 影响钻孔的加工质量。
技术问题 [0005] 本发明的目的在于克服上述现有技术的不足, 提供了一种用于 PCB板钻孔的钻 头, 其刚度佳、 切屑易于排出、 孔位加工精度高。
问题的解决方案
技术解决方案
[0006] 本发明的技术方案是: 一种用于 PCB板钻孔的钻头, 包括本体, 所述本体的一 端为钻尖, 所述本体自所述钻尖一端向另一端依次设置有沟幅比恒定段和沟幅 比交替变化段, 所述本体的外侧设置有螺旋环绕且不交汇的长螺旋槽和短螺旋 槽, 所述长螺旋槽和短螺旋槽于所述沟幅比恒定段的沟幅比恒定, 所述长螺旋 槽和短螺旋槽于所述沟幅比恒定段的沟幅比交替变化, 所述沟幅比恒定段的短 螺旋槽连接有与所述短螺旋槽错幵的错槽。
[0007] 可选地, 所述沟幅比交替变化段, 所述长螺旋槽和短螺旋槽具有交替变化的第 一幅宽和第二幅宽, 且所述第一幅宽大于所述第二幅宽; 所述沟幅比恒定段, 所述长螺旋槽和短螺旋槽具有恒定幅宽, 所述第二幅宽大于 0mm且小于所述恒 定幅宽。
[0008] 可选地, 所述沟幅比恒定段的长度大于钻头 UC段且小于长螺旋槽的 50%。
[0009] 可选地, 所述沟幅比恒定段的沟幅比大于或等于 1 ; 所述沟幅比交替变化段的 沟幅比大于 1。
[0010] 可选地, 所述错槽与短螺旋槽衔接处, 所述错槽的槽宽等于或大于所述短螺旋 槽的槽宽。
[0011] 可选地, 所述错槽的槽宽中心与所述短螺旋槽的槽宽中心错幵位置的宽度大于
0且小于 0.8倍短螺旋槽的槽宽。
[0012] 可选地, 所述错槽的芯厚锥度等于或大于所述长螺旋槽的芯厚锥度。
[0013] 可选地, 所述错槽与所述长螺旋槽并行吋, 所述错槽的槽宽等于或小于所述长 螺旋槽的槽宽。
[0014] 可选地, 所述短螺旋槽与错槽有明显分界线。
[0015] 可选地, 所述短螺旋槽的槽长大于或等于钻头 UC段。
发明的有益效果
有益效果 本发明实施例所提供的用于 PCB板钻孔的钻头, 其所述长螺旋槽和短螺旋 槽于所述沟幅比恒定段的沟幅比恒定, 所述长螺旋槽和短螺旋槽于所述沟幅比 恒定段的沟幅比交替变化 , 所述沟幅比恒定段的短螺旋槽连接有与所述短螺旋 槽错开的错槽。 这样, 釆用了双螺旋槽不交汇设计, 在钻头后段中, 沟幅比值 交错变化, 双槽独立排屑, 切屑不易堵塞, 切削温度可控制在较低范围, 而且 可以增加螺旋槽横截面实体的面积和芯厚锥度, 提高了钻头抗弯强度, 孔位加 工精度高, 钻孔的加工质量佳。
附图说明
为了更清楚地说明本发明实施例中的技术方案, 下面将对实施例中所需要 使用的附图作简单地介绍, 显而易见地, 下面描述中的附图仅仅是本发明的一 些实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳动的前提下, 还 可以才艮据这些附图获得其他的附图。
图 5 ( a )是图 4中 B-B的剖面示意图;
图 5 ( b )是图 4中 A-A的剖面示意图;
图 5 ( c )是图 4中 C-C的剖面示意图;
图 6是本发明实施例提供的具有螺旋槽幅宽图示的用于 PCB板钻孔的钻头 的平面示意图。
具体实施方式
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。
需要说明的是, 当元件被称为 "固定于"或 "设置于" 另一个元件, 它可以 直接在另一个元件上或者可能同时存在居中元件。 当一个元件被称为是"连接 于"另一个元件, 它可以是直接连接到另一个元件或者可能同时存在居中元件。 替换页(细则第 26条) [0027] 还需要说明的是, 本发明实施例中的左、 右、 上、 下等方位用语, 仅是互为相 对概念或是以产品的正常使用状态为参考的, 而不应该认为是具有限制性的。
[0028] 如图 1和图 2所示, 本发明实施例提供的一种用于 PCB板钻孔的钻头, 包括本体 10, 所述本体 10的一端为钻尖, 所述本体 10自所述钻尖一端向另一端依次设置 有沟幅比恒定段 L1和沟幅比交替变化段 L2, 所述本体 10的外侧设置有螺旋环绕 且不交汇的长螺旋槽 101和短螺旋槽 102, 所述长螺旋槽 101和短螺旋槽 102于所 述沟幅比恒定段 L1的沟幅比恒定, 所述长螺旋槽 101和短螺旋槽 102于所述沟幅 比恒定段 L1的沟幅比交替变化, 所述沟幅比恒定段 L1的短螺旋槽 102连接有与所 述短螺旋槽 102错幵的错槽 103。 这样, 采用了双螺旋槽不交汇设计, 在钻头后 段中, 沟幅比值交错变化, 双槽独立排屑, 切屑不易堵塞, 切削温度可控制在 较低范围, 而且可以增加螺旋槽横截面实体的面积和芯厚锥度, 提高了钻头抗 弯强度, 孔位加工精度高, 钻孔的加工质量佳。
[0029] 具体地, 在所述沟幅比交替变化段 L2, 所述长螺旋槽 101和短螺旋槽 102具有交 替变化的第一幅宽 wl和第二幅宽 w2, 且所述第一幅宽 wl大于所述第二幅宽 w2。 在所述沟幅比恒定段 Ll, 所述长螺旋槽 101和短螺旋槽 102具有恒定幅宽 w3。 图 中 w4为沟宽。 所述第二幅宽 w2大于 0mm且小于所述恒定幅宽 w3。 第一幅宽 wl可 以大于或等于恒定幅宽 w3, 钻头抗弯强度佳且排屑效果好。
[0030] 具体地, 所述沟幅比恒定段 L1的长度大于钻头 UC段且小于长螺旋槽 101或短螺 旋槽 102的 50%, 钻头抗弯强度佳且排屑效果好。
[0031] 具体地, 所述沟幅比恒定段 L1的沟幅比大于或等于 1 ; 所述沟幅比交替变化段 L 2的沟幅比大于 1, 在保证钻头抗弯强度的情况下提高排屑效果。
[0032] 具体地, 所述错槽 103与短螺旋槽 102衔接处, 所述错槽 103的槽宽等于或大于 所述短螺旋槽 102的槽宽, 以提高加工质量。
[0033] 具体地, 所述错槽 103的槽宽中心与所述短螺旋槽 102的槽宽中心错幵位置的宽 度大于 0且小于 0.8倍短螺旋槽 102的槽宽。
[0034] 具体地, 所述错槽 103的芯厚锥度等于或大于所述长螺旋槽 101的芯厚锥度, 芯 厚值钻尖小, 螺旋槽末大, 呈正锥, 芯厚锥度为钻尖处芯厚除以槽末处芯厚。
[0035] 具体地, 所述错槽 103与所述长螺旋槽 101并行吋, 所述错槽 103的槽宽等于或 小于所述长螺旋槽 101的槽宽。
[0036] 具体地, 所述短螺旋槽 102与错槽 103有明显分界线。
[0037] 具体地, 所述短螺旋槽 102的槽长大于或等于钻头 UC段。
[0038] 具体应用中, 可以先磨削长螺旋槽 101和短螺旋槽 102, 然后通过错槽 103将短 螺旋槽 102延续至长螺旋槽 101槽长。 然后钻头磨尖, 钻头磨背和切 UC。
[0039] 本发明实施例所提供的用于 PCB板钻孔的钻头, 其所述长螺旋槽 101和短螺旋 槽 102于所述沟幅比恒定段 L1的沟幅比恒定, 所述长螺旋槽 101和短螺旋槽 102于 所述沟幅比恒定段 L1的沟幅比交替变化, 所述沟幅比恒定段 L1的短螺旋槽 102连 接有与所述短螺旋槽 102错幵的错槽 103。 这样, 采用了双螺旋槽不交汇设计, 在钻头后段中, 沟幅比值交错变化, 双槽独立排屑, 切屑不易堵塞, 切削温度 可控制在较低范围, 而且可以增加螺旋槽横截面实体的面积和芯厚锥度, 提高 了钻头抗弯强度, 孔位加工精度高, 钻孔的加工质量佳。
[0040] 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、 等同替换或改进等, 均应包含在本发明的保 护范围之内。

Claims

权利要求书
一种用于 PCB板钻孔的钻头, 包括本体, 所述本体的一端为钻尖, 其 特征在于, 所述本体自所述钻尖一端向另一端依次设置有沟幅比恒定 段和沟幅比交替变化段, 所述本体的外侧设置有螺旋环绕且不交汇的 长螺旋槽和短螺旋槽, 所述长螺旋槽和短螺旋槽于所述沟幅比恒定段 的沟幅比恒定, 所述长螺旋槽和短螺旋槽于所述沟幅比恒定段的沟幅 比交替变化, 所述沟幅比恒定段的短螺旋槽连接有与所述短螺旋槽错 幵的错槽。
如权利要求 1所述的用于 PCB板钻孔的钻头, 其特征在于, 所述沟幅 比交替变化段, 所述长螺旋槽和短螺旋槽具有交替变化的第一幅宽和 第二幅宽, 且所述第一幅宽大于所述第二幅宽; 所述沟幅比恒定段, 所述长螺旋槽和短螺旋槽具有恒定幅宽, 所述第二幅宽大于 0mm且小 于所述恒定幅宽。
如权利要求 1所述的用于 PCB板钻孔的钻头, 其特征在于, 所述沟幅 比恒定段的长度大于钻头 UC段且小于长螺旋槽的 50%。
如权利要求 1所述的用于 PCB板钻孔的钻头, 其特征在于, 所述沟幅 比恒定段的沟幅比大于或等于 1; 所述沟幅比交替变化段的沟幅比大 于 1。
如权利要求 1所述的用于 PCB板钻孔的钻头, 其特征在于, 所述错槽 与短螺旋槽衔接处, 所述错槽的槽宽等于或大于所述短螺旋槽的槽宽
[权利要求 6] 如权利要求 1至 5中任一项所述的用于 PCB板钻孔的钻头, 其特征在于
, 所述错槽的槽宽中心与所述短螺旋槽的槽宽中心错幵位置的宽度大 于 0且小于 0.8倍短螺旋槽的槽宽。
[权利要求 7] 如权利要求 1至 5中任一项所述的用于 PCB板钻孔的钻头, 其特征在于
, 所述错槽的芯厚锥度等于或大于所述长螺旋槽的芯厚锥度。
[权利要求 8] 如权利要求 1至 5中任一项所述的用于 PCB板钻孔的钻头, 其特征在于
, 所述错槽与所述长螺旋槽并行吋, 所述错槽的槽宽等于或小于所述 长螺旋槽的槽宽。
[权利要求 9] 如权利要求 1至 5中任一项所述的用于 PCB板钻孔的钻头, 其特征在于
, 所述短螺旋槽与错槽有明显分界线。
[权利要求 10] 如权利要求 1至 5中任一项所述的用于 PCB板钻孔的钻头, 其特征在于
, 所述短螺旋槽的槽长大于或等于钻头 UC段。
PCT/CN2016/093911 2015-11-04 2016-08-08 用于 pcb 板钻孔的钻头 WO2017076092A1 (zh)

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