JP2013049098A - Drill grinding device, its parts and drill - Google Patents

Drill grinding device, its parts and drill Download PDF

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Publication number
JP2013049098A
JP2013049098A JP2011186849A JP2011186849A JP2013049098A JP 2013049098 A JP2013049098 A JP 2013049098A JP 2011186849 A JP2011186849 A JP 2011186849A JP 2011186849 A JP2011186849 A JP 2011186849A JP 2013049098 A JP2013049098 A JP 2013049098A
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drill
cutting edge
chisel
flank
polishing
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Masaaki Matsushita
正明 松下
Shigeki Michihata
繁樹 道籏
Koji Demachi
孝治 出町
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JIKEN CENTER CO Ltd
JIKEN CT CO Ltd
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JIKEN CENTER CO Ltd
JIKEN CT CO Ltd
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  • Polishing Bodies And Polishing Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a drill grinding device which processes a drill so that a larger number of cutting processes than a conventional device can be continuously performed.SOLUTION: This drill grinding device grinds the drill formed with a drill cutting edge including a rake face and a chisel cutting edge which is continuous to the drill cutting edge by making the drill abut on the grinding face of a rotating grinding stone 1. The grinding face has a drill cutting edge grinding face 11 for grinding the drill cutting edge and a flank 12 which is formed continuing to the drill cutting edge grinding face 11. An inclination angle formed of the drill cutting edge grinding face 11 and the flank 12 is within a range of 20° to 26°, and the length of the flank is not shorter than 1.1 [mm]. By an effect that the drill cutting edge abuts on the rotating drill cutting edge grinding face 11, and the rake face of the drill and the chisel cutting edge abut on the flank 12, an angle formed of the drill cutting edge and the chisel cutting edge is formed within a range of 154° to 160°.

Description

本発明は、例えば板金を重ねてスポット溶接された構造物に穴明けのような切削加工を行うためのドリルの先端加工装置に関し、特に自動車等に用いられる高硬度の鋼板への切削加工に用いるドリルの先端の研磨加工に適した装置及びその部品並びにドリルに関する。   TECHNICAL FIELD The present invention relates to a drill tip processing apparatus for performing cutting processing such as drilling on a structure spot-welded by overlapping sheet metal, and particularly used for cutting high-hardness steel plates used in automobiles and the like. The present invention relates to an apparatus suitable for polishing processing of a tip of a drill, its components, and a drill.

従来、自動車のボディ等を分解する際には、金属板同士を重ね合わせてスポット溶接された部分(以下、「スポット溶接部」という)を切削加工により剥離して、金属板を分離することが行われている。切削加工には、ドリルを用いることが一般的である。ドリルの刃先は、使用し続けることで磨耗して、ついには切削加工ができない状態になる。そのために、磨耗したドリルの先端を再研磨する必要がある。特許文献1には、ドリルの先端を研磨加工するための従来のドリル研磨装置が開示されている。   Conventionally, when disassembling an automobile body or the like, a metal plate is separated by peeling a portion (hereinafter referred to as “spot welded portion”) spot-welded by overlapping metal plates together by cutting. Has been done. It is common to use a drill for cutting. The cutting edge of the drill is worn by continued use, and finally becomes in a state where cutting cannot be performed. Therefore, it is necessary to re-polish the worn drill tip. Patent Document 1 discloses a conventional drill polishing apparatus for polishing a tip of a drill.

WO99/28082号公報WO99 / 28082

特許文献1のドリル研磨装置は、車両のボディ等に使用されるスポット溶接部の剥離に使用可能な、ローソク型ドリルを研磨加工するための装置である。このドリル研磨装置は、ドリル研削台にドリルを固定して、砥石のドリル切刃研磨面となる平行面によりドリルの切刃を研磨加工することができる。また、ドリルシンニング台にドリルを固定して、砥石の傾斜面及び第2平行面によりシンニング加工を行うことができる。   The drill polishing apparatus of Patent Document 1 is an apparatus for polishing a candle type drill that can be used for peeling off spot welds used in a vehicle body or the like. In this drill polishing apparatus, a drill is fixed to a drill grinding table, and the cutting edge of the drill can be polished by a parallel surface that is a polishing surface of the grindstone. Moreover, a drill can be fixed to a drill thinning stand, and a thinning process can be performed by the inclined surface of a grindstone, and a 2nd parallel surface.

ドリル研磨装置を用いて、従来よりも作業効率が上がるようなドリルに加工できることが望ましい。特に、近年の自動車のボディ等を構成する金属板は、薄板化を図るために張力が高い高張力鋼板が使用されている。高張力鋼板に対して、従来のドリルは、切刃の磨耗が激しく、連続して多数のスポット溶接部に切削加工を行うことが困難である。   It is desirable that the drill can be processed into a drill with higher work efficiency than before by using a drill polishing apparatus. In particular, a high-tensile steel plate having a high tension is used for a metal plate constituting a body of an automobile in recent years in order to reduce the thickness. In contrast to high-strength steel plates, conventional drills are severely worn by the cutting blades, and it is difficult to continuously perform machining on a large number of spot welds.

本願発明者らは、ドリル先端のチゼルの形状を工夫することで、高張力鋼板のように高硬度のスポット溶接部の切削を効率よく行えることを発見した。具体的には、チゼル切刃の切刃に対する角度及びチゼルの基端の幅を所定の範囲で形成することで、切削の効率が向上する。特許文献1のドリル研磨装置では、平行面(ドリル切刃研磨面)に対する逃げ面の傾斜角度が35度であり、チゼル切刃の切刃に対する角度を上記の所定の範囲内に形成することが困難である。   The inventors of the present application have found that, by devising the shape of the chisel at the tip of the drill, it is possible to efficiently cut a spot weld with high hardness like a high-tensile steel plate. Specifically, the efficiency of cutting is improved by forming the angle of the chisel cutting edge with respect to the cutting edge and the width of the base end of the chisel within a predetermined range. In the drill polishing apparatus of Patent Document 1, the inclination angle of the flank with respect to the parallel surface (drill cutting blade polishing surface) is 35 degrees, and the angle of the chisel cutting blade with respect to the cutting blade can be formed within the predetermined range. Have difficulty.

本発明では、このような問題に鑑み、従来よりも多数の切削加工を連続して行えるようにドリルの加工を行うためのドリル研磨装置及びその部品並びにドリルを提供することを課題とする。   In view of such problems, an object of the present invention is to provide a drill polishing apparatus, a part thereof, and a drill for performing drill processing so that a larger number of cutting operations can be continuously performed than in the past.

以上の課題を解決する本発明のドリル研磨装置は、すくい面を含むドリル切刃とこのドリル切刃と連なるチゼル切刃とが形成されたドリルを、回転する砥石の研磨面に当接させることにより研磨加工するドリル研磨装置である。前記研磨面が、前記ドリル切刃を研磨するためのドリル切刃研磨面と、前記ドリル切刃研磨面に連通して形成された逃げ面とを有する。前記ドリル切刃研磨面と前記逃げ面とのなす傾斜角が20度〜26度の範囲内であり、前記逃げ面の長さが1.1[mm]以上である。回転する前記ドリル切刃研磨面に前記ドリル切刃が当接され、前記逃げ面に前記ドリルのすくい面及びチゼル切刃が当接されることで、前記ドリル切刃とチゼル切刃とのなす角度を154度〜160度の範囲内に形成する。
前記ドリル切刃研磨面と前記逃げ面とのなす傾斜角は、例えば略22度である。
The drill polishing apparatus of the present invention that solves the above-described problems makes a drill in which a drill cutting edge including a rake face and a chisel cutting edge connected to the drill cutting edge are brought into contact with the polishing surface of a rotating grindstone. This is a drill polishing apparatus that performs polishing by using the above method. The polishing surface has a drill cutting edge polishing surface for polishing the drill cutting edge, and a flank formed in communication with the drill cutting edge polishing surface. The inclination angle formed by the drill cutting edge polished surface and the flank is in the range of 20 to 26 degrees, and the length of the flank is 1.1 mm or more. The drill cutting edge is brought into contact with the rotating grinding surface of the drill cutting edge, and the rake face and chisel cutting edge of the drill are brought into contact with the flank face, thereby forming the drill cutting edge and the chisel cutting edge. The angle is formed within a range of 154 to 160 degrees.
An inclination angle formed by the drill cutting edge polishing surface and the flank surface is, for example, approximately 22 degrees.

ドリル切刃とチゼル切刃とのなす角度が154度〜160度の範囲内であれば、従来のドリルよりも切削加工を効率よく行うことを、発明者は実験により確認している。これは、切削加工の際にチゼル切刃から切刃にかけての角度変化により、従来よりも切刃への切削抵抗の増加、集中が無くなり、切刃の磨耗を抑制することができるためである。   The inventor has confirmed through experiments that cutting is performed more efficiently than conventional drills if the angle between the drill cutting edge and the chisel cutting edge is in the range of 154 to 160 degrees. This is because, when cutting, the angle change from the chisel cutting edge to the cutting edge eliminates the increase and concentration of the cutting resistance to the cutting edge as compared with the conventional case, and can suppress wear of the cutting edge.

本発明の砥石は、すくい面を含むドリル切刃とこのドリル切刃と連なるチゼル切刃とが形成されたドリルを研磨加工するドリル研磨装置に離脱自在に嵌着され、使用時には回転して研磨面を提供する円盤状の砥石である。砥石は、その中心部に前記ドリル研磨装置に嵌着するための開口部が形成されており、その外周端部には、前記ドリル切刃を研磨するためのドリル切刃研磨面と、前記ドリル切刃研磨面に連通して前記開口部側に傾斜して形成される逃げ面とが形成される。前記ドリル切刃研磨面と前記逃げ面とのなす傾斜角が20度〜26度の範囲内であり、前記逃げ面の長さが1.1[mm]以上である。回転する前記ドリル切刃研磨面に前記ドリル切刃が当接され、前記逃げ面に前記ドリルのすくい面及びチゼル切刃が当接されることで、前記ドリル切刃とチゼル切刃とのなす角度を154度〜160度の範囲内に形成する。   The grindstone of the present invention is removably fitted to a drill polishing apparatus for polishing a drill in which a drill cutting edge including a rake face and a chisel cutting edge connected to the drill cutting edge are formed. It is a disc-shaped grindstone that provides a surface. An opening for fitting the grindstone to the drill polishing apparatus is formed at the center thereof, and a drill cutting edge polishing surface for polishing the drill cutting edge is formed at the outer peripheral end of the grindstone. A relief surface is formed which communicates with the cutting edge polishing surface and is inclined toward the opening. The inclination angle formed by the drill cutting edge polished surface and the flank is in the range of 20 to 26 degrees, and the length of the flank is 1.1 mm or more. The drill cutting edge is brought into contact with the rotating grinding surface of the drill cutting edge, and the rake face and chisel cutting edge of the drill are brought into contact with the flank face, thereby forming the drill cutting edge and the chisel cutting edge. The angle is formed within a range of 154 to 160 degrees.

本発明のドリルは、すくい面が形成されて軸線周りに回転される略円柱状のドリル本体を有し、このドリル本体の先端の逃げ面から突出してチゼルが設けられており、前記すくい面及び前記逃げ面により形成されるドリル切刃と、このドリル切刃に連なるチゼル切刃とのなす角度が154度〜160度である。   The drill of the present invention has a substantially cylindrical drill body that is formed with a rake face and rotated about an axis, and is provided with a chisel that protrudes from the flank at the tip of the drill body. The angle between the drill cutting edge formed by the flank and the chisel cutting edge connected to the drill cutting edge is 154 to 160 degrees.

本発明によれば、砥石のドリル切刃研磨面と逃げ面とのなす傾斜角を20度〜26度の範囲内で形成することで、ドリルの切刃と前記チゼル切刃とのなす角を、154度〜160度の範囲内に形成することができる。この角度は、本願発明者の切削実験により、効率よくスポット溶接部を切削することができる形状である。本発明のドリル研磨装置は、このようなドリルの加工を容易に行うことができる。   According to the present invention, the angle formed by the drill cutting edge and the chisel cutting edge is formed by forming the inclination angle formed by the grinding surface of the drill cutting edge of the grindstone and the flank within a range of 20 to 26 degrees. It can be formed within the range of 154 to 160 degrees. This angle is a shape that can efficiently cut the spot welded portion by the cutting experiment of the present inventors. The drill polishing apparatus of the present invention can easily perform such drill processing.

砥石の断面図である。It is sectional drawing of a grindstone. 図1の円内拡大図である。It is an enlarged view in a circle of FIG. ドリル研磨加工時のドリルと砥石との位置を説明する図である。It is a figure explaining the position of a drill and a grindstone at the time of drill grinding. サンプル1,2及び既存品1のチゼル根元角θ及びチゼル根元幅Wの一覧図である。FIG. 6 is a list of chisel root angles θ and chisel root widths W of samples 1 and 2 and an existing product 1. ボール盤を用いた切削実験の結果を表す図である。It is a figure showing the result of the cutting experiment using a drilling machine. ボール盤を用いた切削実験の、1回当たりの切削加工に要した時間と切削点数をサンプル毎に表すグラフである。It is a graph showing the time and the number of cutting points required for one cutting of a cutting experiment using a drilling machine for each sample. ハンドドリルを用いた切削実験の結果を表す図である。It is a figure showing the result of the cutting experiment using a hand drill. ハンドドリルを用いた切削実験の、1回当たりの切削加工に要した時間と切削点数をサンプル毎に表すグラフである。It is a graph showing the time and the number of cutting points required for one cutting of a cutting experiment using a hand drill for each sample. サンプル3〜10及び既存品2のチゼル根元角θ及びチゼル根元幅Wの一覧図である。It is a list of the chisel root angle θ and the chisel root width W of samples 3 to 10 and the existing product 2. チゼル根元角θと切削点数との関係を表すグラフである。It is a graph showing the relationship between chisel root angle (theta) and the number of cutting points. チゼル根元長Wと切削点数との関係を表すグラフである。It is a graph showing the relationship between chisel root length W and the number of cutting points.

以下、本発明の実施の形態を図面を参照しつつ詳細に説明する。
本実施形態のドリル研磨装置には、特許文献1のドリル研磨装置を用いることができるが、砥石の形状、特に外周の研磨面の形状が異なる。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As the drill polishing apparatus of this embodiment, the drill polishing apparatus of Patent Document 1 can be used, but the shape of the grindstone, particularly the shape of the outer peripheral polishing surface, is different.

図1は、本実施形態の砥石1の断面図であり、図2は、図1の円内拡大図である。
砥石1は、円盤状であり、その中心にドリル研磨装置に嵌着するための開口部10が設けられる。砥石1は、ドリル研磨装置に嵌着されて回転する。
砥石1の外周には研磨面が形成される。研磨面は、ドリル切刃を研磨するためのドリル切刃研磨面11と、このドリル切刃研磨面11に連通して形成された逃げ面12と、ドリル切刃研磨面11に連通して逃げ面12とは逆方向に傾斜して形成されたシンニング加工用の傾斜面13と、傾斜面13に連通してドリル切刃研磨面11から突起して形成された突起部14とを備えている。
FIG. 1 is a cross-sectional view of the grindstone 1 of the present embodiment, and FIG. 2 is an enlarged view in a circle of FIG.
The grindstone 1 is disc-shaped, and an opening 10 for fitting in a drill polishing apparatus is provided at the center thereof. The grindstone 1 is fitted into a drill polishing apparatus and rotates.
A polishing surface is formed on the outer periphery of the grindstone 1. The polishing surface includes a drill cutting blade polishing surface 11 for polishing the drill cutting blade, a flank 12 formed in communication with the drill cutting blade polishing surface 11, and a clearance in contact with the drill cutting blade polishing surface 11. An inclined surface 13 for thinning that is formed to be inclined in a direction opposite to the surface 12, and a protruding portion 14 that is formed to protrude from the drill cutting edge polishing surface 11 in communication with the inclined surface 13. .

ドリル切刃研磨面11と逃げ面12とのなす傾斜角度θ1が20度〜26度の範囲内で形成されており、ドリル切刃研磨面11と傾斜面13とのなす傾斜角度θ2が例えば60度に設定されている。逃げ面12の長さdは、1.1[mm]以上に形成される。また、突起部14の後端部、即ち砥石1の最後部にはアールが施されている。
砥石1としてはCBN#170電着砥石が好適に使用されるが、特にこれに限定されるものではない。
The inclination angle θ1 formed by the drill cutting edge polishing surface 11 and the flank 12 is formed within a range of 20 to 26 degrees, and the inclination angle θ2 formed by the drill cutting edge polishing surface 11 and the inclined surface 13 is 60, for example. Is set to degrees. The length d of the flank 12 is formed to be 1.1 [mm] or more. Further, the rear end portion of the protrusion 14, that is, the rearmost portion of the grindstone 1 is rounded.
Although the CBN # 170 electrodeposition grindstone is preferably used as the grindstone 1, it is not particularly limited to this.

砥石1は、開口部10によりドリル研磨装置に嵌着される。開口部10には、例えばモータの回転軸が装着されて、これが回転することにより、砥石1が回転して、ドリルの研磨加工が可能になる。図3は、ドリル2のドリル切刃23を研磨加工するときの、ドリル2と砥石1との位置を説明する図である。   The grindstone 1 is fitted into the drill polishing apparatus through the opening 10. For example, a rotating shaft of a motor is attached to the opening 10, and when this rotates, the grindstone 1 rotates to enable the drill to be polished. FIG. 3 is a diagram for explaining the positions of the drill 2 and the grindstone 1 when the drill cutting edge 23 of the drill 2 is polished.

ドリル2は、これに限らないが好適には高速度工具鋼で構成されている。ドリル2は、外形が略円柱状をなして軸線を中心に回転されるドリル本体20と、ドリル本体20の後端に設けられ、工作機械の主軸端等に把持される図外のシャンク部とを備えている。
ドリル本体20の外周には、ドリル本体20の先端側から後端側にかけて軸線の周りに螺旋状に形成された2本のすくい面21が形成される。
ドリル本体20の先端側は、逃げ面22が設けられており、すくい面21と逃げ面22とによりドリル切刃23が形成されている。また、ドリル本体20の先端側には、軸線から見て略中央に逃げ面22から突出するように断面が山形のチゼル24が設けられている。
Although not limited to this, the drill 2 is preferably made of high-speed tool steel. The drill 2 has a drill body 20 whose outer shape is substantially cylindrical and rotated about an axis, and a shank portion (not shown) provided at the rear end of the drill body 20 and gripped by the spindle end or the like of a machine tool. It has.
On the outer periphery of the drill body 20, two rake faces 21 formed in a spiral around the axis line are formed from the front end side to the rear end side of the drill body 20.
A flank 22 is provided on the distal end side of the drill body 20, and a drill cutting edge 23 is formed by the rake face 21 and the flank 22. Further, a chisel 24 having a chevron cross section is provided on the tip side of the drill body 20 so as to protrude from the flank 22 substantially in the center when viewed from the axis.

チゼル24とすくい面21とにより、ドリル切刃23に連なって切刃(以下、「チゼル切刃」という。)25が形成される。チゼル切刃25は、ドリル切刃23に対して所定の角度(以下、「チゼル根元角θ」という。)で設けられている。また、山形のチゼル24の基端の幅(ドリル切刃23とチゼル切刃25との接続部間)を本明細書ではチゼル根元長といい「W」で表す。   The chisel 24 and the rake face 21 form a cutting edge (hereinafter referred to as “chisel cutting edge”) 25 connected to the drill cutting edge 23. The chisel cutting edge 25 is provided at a predetermined angle with respect to the drill cutting edge 23 (hereinafter referred to as “chisel root angle θ”). In addition, the width of the base end of the chevron chisel 24 (between the connecting portions of the drill cutting edge 23 and the chisel cutting edge 25) is referred to as a chisel root length in this specification and is represented by “W”.

研磨加工時にドリル2は、シャンク部がドリルホルダに嵌挿されて、ドリル研削台に固定される。ドリル研削台に固定された状態で、ドリル2のドリル切刃23が、砥石1のドリル切刃研磨面1に当接する。また、ドリル2のチゼル切刃25が、逃げ面12に当接する。このようにドリル2と砥石1とを当接させて研磨加工が行われる。
本実施形態の砥石1の傾斜角θ1が20度〜26度であるために、研磨加工により、ドリル2のチゼル根元角θが154度〜160度になる。また、砥石1の逃げ面12の長さdが1.1[mm]以上であるために、チゼル根元長Wが2.2[mm]以上のドリルの研磨加工が可能である。好適には、逃げ面12の長さdが1.1[mm]〜2.5[mm]であり、チゼル根元長Wが2.2[mm]〜5.0[mm]に研磨加工である。
At the time of polishing, the drill 2 is fixed to a drill grinding table by inserting a shank portion into a drill holder. The drill cutting edge 23 of the drill 2 abuts against the drill cutting edge polishing surface 1 of the grindstone 1 while being fixed to the drill grinding table. Further, the chisel cutting edge 25 of the drill 2 contacts the flank 12. Thus, polishing is performed by bringing the drill 2 and the grindstone 1 into contact with each other.
Since the inclination angle θ1 of the grindstone 1 of the present embodiment is 20 degrees to 26 degrees, the chisel root angle θ of the drill 2 becomes 154 degrees to 160 degrees by polishing. Moreover, since the length d of the flank 12 of the grindstone 1 is 1.1 [mm] or more, it is possible to polish a drill having a chisel root length W of 2.2 [mm] or more. Preferably, the length d of the flank 12 is 1.1 [mm] to 2.5 [mm], and the chisel root length W is 2.2 [mm] to 5.0 [mm]. is there.

チゼル24の切削抵抗が集中する部分は、シンニング加工が施されて、切削抵抗を少なくするように形成される。シンニング加工時には、ドリル2のシャンク部がドリルホルダに嵌挿されて、ドリルシンニング台に固定される。シンニング加工は、S形、N形、X形等で所定のシンニング量で行われる。シンニング加工は、ドリル2のチゼル24の切削抵抗が集中する部分が、傾斜面13及び突起部14に当接して行われる。   The portion of the chisel 24 where the cutting resistance is concentrated is formed so as to reduce the cutting resistance by thinning. During the thinning process, the shank portion of the drill 2 is fitted into the drill holder and fixed to the drill thinning table. Thinning is performed with a predetermined amount of thinning in the S-type, N-type, X-type, and the like. The thinning process is performed in such a manner that the portion where the cutting resistance of the chisel 24 of the drill 2 is concentrated contacts the inclined surface 13 and the protrusion 14.

このようにチゼル根元角θが154度〜160度に形成されたドリルにより、ボール盤及びハンドドリルを用いて、厚さ1.4[mm]の980[MPa]鋼板のスポット溶接部を、1箇所当たり15秒以下で続けて切削加工できる数(以下、「切削点数」という。)を測定した。   By using a drilling machine and a hand drill, a spot welded portion of a 980 [MPa] steel plate having a thickness of 1.4 [mm] is formed at one location using a drill having a chisel root angle θ of 154 to 160 degrees. The number that can be continuously cut in 15 seconds or less (hereinafter referred to as “the number of cutting points”) was measured.

図4は、切削実験に用いたドリルのチゼル根元角θ及びチゼル根元幅Wの一覧図である。実験に用いるドリルには、サンプル1、サンプル2、既存品1の3種類を用いる。サンプル1は、本実施形態のドリル研磨装置により加工したドリルであり、チゼル根元角が158度、チゼル根元長が3.6[mm]である。サンプル2は、本実施形態のドリル研磨装置により加工したドリルであり、チゼル根元角が158度、チゼル根元長が4.6[mm]である。既存品1は、既存のドリル研磨装置により加工したドリルであり、チゼル根元角が143度、チゼル根元長が2.8[mm]である。   FIG. 4 is a list of the chisel root angle θ and the chisel root width W of the drill used in the cutting experiment. Three types of drills used in the experiment, sample 1, sample 2, and existing product 1, are used. Sample 1 is a drill processed by the drill polishing apparatus of this embodiment, and has a chisel root angle of 158 degrees and a chisel root length of 3.6 [mm]. Sample 2 is a drill processed by the drill polishing apparatus of the present embodiment, and has a chisel root angle of 158 degrees and a chisel root length of 4.6 [mm]. The existing product 1 is a drill processed by an existing drill polishing apparatus, and has a chisel root angle of 143 degrees and a chisel root length of 2.8 [mm].

図5は、ボール盤を用いた切削実験の結果を表す図である。図6は、ボール盤を用いた切削実験の、1回当たりの切削加工に要した時間と切削点数をサンプル毎に表すグラフである。切削時間に15秒以上要した場合には、切削加工を終了する。
サンプル1のドリルでは切削点数が60点、サンプル2のドリルでは切削点数が68点、既存品1のドリルでは切削点数が20点となった。
FIG. 5 is a diagram showing the results of a cutting experiment using a drilling machine. FIG. 6 is a graph showing the time and the number of cutting points required for one cutting operation for each sample in a cutting experiment using a drilling machine. If the cutting time takes 15 seconds or more, the cutting process is terminated.
The drill of sample 1 had 60 cutting points, the drill of sample 2 had 68 cutting points, and the existing product 1 had 20 cutting points.

図7は、ハンドドリルを用いた切削実験の結果を表す図である。図8は、ハンドドリルを用いた切削実験の、1回当たりの切削加工に要した時間と切削点数をサンプル毎に表すグラフである。ボール盤使用時と同様に、切削時間に15秒以上要した場合には、切削加工を終了する。
サンプル1のドリルでは切削点数が46点、サンプル2のドリルでは切削点数が60点、既存品のドリルでは切削点数が7点となった。
FIG. 7 is a diagram illustrating a result of a cutting experiment using a hand drill. FIG. 8 is a graph showing the time and number of cutting points required for one cutting operation for each sample in a cutting experiment using a hand drill. As in the case of using a drilling machine, when the cutting time takes 15 seconds or more, the cutting process is terminated.
The drill of sample 1 had 46 cutting points, the drill of sample 2 had 60 cutting points, and the existing drill had 7 cutting points.

これらの結果から、チゼル根元角θ及びチゼル根元長Wともに、大きい方が切削点数が多く、切削加工に適していることがわかる。また、サンプル1、2ともに、急激に性能が劣化しており、切削加工にかかる時間が急に大きくなったり、或いは切削できなくなる。   From these results, it can be seen that the larger the chisel root angle θ and the chisel root length W, the larger the number of cutting points, which is suitable for cutting. In addition, the performance of both samples 1 and 2 is abruptly deteriorated, and the time required for the cutting process becomes abruptly increased or cutting cannot be performed.

図9は、チゼル根元角θ及びチゼル根元長Wの適正値の範囲を求めるための切削実験に用いたドリルのチゼル根元角θ及びチゼル根元幅Wの一覧図である。実験に用いるドリルには、サンプル3〜サンプル10、及び既存品2の9種類を用いる。サンプル3〜サンプル5及びサンプル8〜サンプル10は、チゼル根元角が154度〜160度、チゼル根元長が2.2[mm]〜5.0[mm]の範囲内にある。サンプル6、サンプル7は、それぞれ、チゼル根元角が146度、142度、チゼル根元長が2.1[mm]、2.7[mm]である。既存品2は、チゼル根元角が146度、チゼル根元長が2.8[mm]である。実験の条件は、図7、図8の実験と同じであり、サンプルのみが異なる。   FIG. 9 is a list of the chisel root angle θ and the chisel root width W of the drill used in the cutting experiment for obtaining the range of appropriate values of the chisel root angle θ and the chisel root length W. Nine types of samples 3 to 10 and existing product 2 are used for the drill used in the experiment. Samples 3 to 5 and Samples 8 to 10 have a chisel root angle of 154 to 160 degrees and a chisel root length of 2.2 [mm] to 5.0 [mm]. Samples 6 and 7 have chisel root angles of 146 degrees and 142 degrees and chisel root lengths of 2.1 [mm] and 2.7 [mm], respectively. The existing product 2 has a chisel root angle of 146 degrees and a chisel root length of 2.8 [mm]. The experimental conditions are the same as those of the experiments of FIGS. 7 and 8, and only the samples are different.

実験の結果、サンプル3のドリルでは切削点数が21点、サンプル4のドリルでは切削点数が25点、サンプル5のドリルでは切削点数が38点、サンプル6のドリルでは切削点数が0点、サンプル7のドリルでは切削点数が12点、サンプル8のドリルでは切削点数が19点、サンプル9のドリルでは切削点数が27点、サンプル10のドリルでは切削点数が44点、既存品2のドリルでは切削点数が3点となった。   As a result of the experiment, the sample 3 drill has 21 cutting points, the sample 4 drill has 25 cutting points, the sample 5 drill has 38 cutting points, the sample 6 drill has 0 cutting points, the sample 7 The number of cutting points is 12 for the drill of No. 8, the number of cutting points of 19 for the drill of Sample 8, the number of cutting points of 27 for the Drill of Sample 9, the number of cutting of 44 for the Drill of Sample 10, and the number of cutting for the Drill of the existing product 2 Became 3 points.

図10、チゼル根元角θと切削点数との関係を表すグラフである。図11は、チゼル根元長Wと切削点数との関係を表すグラフである。
これらのグラフから明らかなように、チゼル根元角θが154度〜160度の間で、またチゼル根元長Wは2.2[mm]〜5[mm]の間で、既存品に比べて大幅に切削点数が多くなっている。チゼル根元角θは、154度以上で、大きくなるにつれて切削点数が大きくなる傾向にある。
FIG. 10 is a graph showing the relationship between the chisel root angle θ and the number of cutting points. FIG. 11 is a graph showing the relationship between the chisel root length W and the number of cutting points.
As is clear from these graphs, the chisel root angle θ is between 154 and 160 degrees, and the chisel root length W is between 2.2 [mm] and 5 [mm], which is significantly larger than the existing products. The number of cutting points has increased. The chisel root angle θ is 154 degrees or more, and the number of cutting points tends to increase as it increases.

このようにチゼル根元角θが154度〜160度の範囲内で形成され、チゼル根元長Wが2.2[mm]〜5[mm]の範囲内で形成されたドリルは、高張力鋼板であってもドリル切刃23の磨耗を抑制して、連続して従来よりも多数のスポット溶接部に短時間で切削加工を行うことが可能となる。そのために、切削加工を従来よりもはるかに効率よく行うことができ、作業者の労力を抑えることができる。
そのために、砥石1の傾斜角θ1が20度〜26度であり、逃げ面12の長さdが1.1[mm]以上でれば、このようなドリルに容易に加工できる。
The drill with the chisel root angle θ in the range of 154 to 160 degrees and the chisel root length W in the range of 2.2 [mm] to 5 [mm] is a high-strength steel plate. Even if it exists, it becomes possible to suppress the abrasion of the drill cutting edge 23 and to perform a cutting process continuously in a short time to many spot weld parts conventionally. Therefore, cutting can be performed much more efficiently than before, and the labor of the operator can be suppressed.
Therefore, if the inclination angle θ1 of the grindstone 1 is 20 to 26 degrees and the length d of the flank 12 is 1.1 [mm] or more, such a drill can be easily processed.

なお、切削実験に用いた各サンプルのチゼル根元角θ及びチゼル根元長Wは、加工精度の限界から正確に上記の値ではなく、バラツキを持っている。そのために、例えば図4でチゼル根元角θが158度であっても、実際には正確に158度ではない。また、同様の理由で、砥石1の傾斜角θ1も正確に22度ではなく略22度である。   Note that the chisel root angle θ and the chisel root length W of each sample used in the cutting experiment are not exactly the above values but have variations due to the limit of machining accuracy. Therefore, for example, even if the chisel root angle θ in FIG. 4 is 158 degrees, it is not exactly 158 degrees in practice. For the same reason, the inclination angle θ1 of the grindstone 1 is not exactly 22 degrees, but is approximately 22 degrees.

1…砥石、10…開口部、11…ドリル切刃研磨面、12…逃げ面、13…傾斜面、14…突起部、2…ドリル、20…ドリル本体、21…すくい面、22…逃げ面、23…ドリル切刃、24…チゼル、25…チゼル切刃   DESCRIPTION OF SYMBOLS 1 ... Grinding stone, 10 ... Opening part, 11 ... Drill cutting edge grinding | polishing surface, 12 ... Flank, 13 ... Inclined surface, 14 ... Projection part, 2 ... Drill, 20 ... Drill main body, 21 ... Rake face, 22 ... Flank 23 ... Drill cutting edge, 24 ... Chisel, 25 ... Chisel cutting edge

Claims (4)

すくい面を含むドリル切刃とこのドリル切刃と連なるチゼル切刃とが形成されたドリルを、回転する砥石の研磨面に当接させることにより研磨加工するドリル研磨装置であって、
前記研磨面が、
前記ドリル切刃を研磨するためのドリル切刃研磨面と、
前記ドリル切刃研磨面に連通して形成された逃げ面とを有し、
前記ドリル切刃研磨面と前記逃げ面とのなす傾斜角が20度〜26度の範囲内であり、
前記逃げ面の長さが1.1[mm]以上であり、
回転する前記ドリル切刃研磨面に前記ドリル切刃が当接され、前記逃げ面に前記ドリルのすくい面及びチゼル切刃が当接されることで、前記ドリル切刃とチゼル切刃とのなす角度を154度〜160度の範囲内に形成する、
ドリル研磨装置。
A drill polishing apparatus that performs polishing by bringing a drill formed of a drill cutting edge including a rake face and a chisel cutting edge connected to the drill cutting edge into contact with a polishing surface of a rotating grindstone,
The polished surface is
A drill cutting edge polishing surface for polishing the drill cutting edge;
A flank formed in communication with the drill cutting edge polishing surface,
An inclination angle formed by the drill cutting edge polished surface and the flank surface is within a range of 20 degrees to 26 degrees;
The length of the flank is 1.1 [mm] or more,
The drill cutting edge is brought into contact with the rotating grinding surface of the drill cutting edge, and the rake face and chisel cutting edge of the drill are brought into contact with the flank face, thereby forming the drill cutting edge and the chisel cutting edge. Forming an angle within a range of 154 to 160 degrees;
Drill polishing equipment.
前記ドリル切刃研磨面と前記逃げ面とのなす傾斜角が略22度である、
請求項1記載のドリル研磨装置。
An inclination angle formed by the drill cutting edge polishing surface and the flank is approximately 22 degrees.
The drill polishing apparatus according to claim 1.
すくい面を含むドリル切刃とこのドリル切刃と連なるチゼル切刃とが形成されたドリルを研磨加工するドリル研磨装置に離脱自在に嵌着され、使用時には回転して研磨面を提供する円盤状の砥石であって、
その中心部に前記ドリル研磨装置に嵌着するための開口部が形成されており、
その外周端部には、前記ドリル切刃を研磨するためのドリル切刃研磨面と、前記ドリル切刃研磨面に連通して前記開口部側に傾斜して形成される逃げ面とが形成されており、
前記ドリル切刃研磨面と前記逃げ面とのなす傾斜角が20度〜26度の範囲内であり、
前記逃げ面の長さが1.1[mm]以上であり、
回転する前記ドリル切刃研磨面に前記ドリル切刃が当接され、前記逃げ面に前記ドリルのすくい面及びチゼル切刃が当接されることで、前記ドリル切刃とチゼル切刃とのなす角度を154度〜160度の範囲内に形成する、
ドリル研磨装置用砥石。
A disc shape that is removably fitted to a drill polishing device that polishes a drill formed with a drill cutting edge including a rake face and a chisel cutting edge connected to the drill cutting edge, and provides a polishing surface by rotating during use. The whetstone of
An opening for fitting to the drill polishing apparatus is formed at the center,
A drill cutting edge polishing surface for polishing the drill cutting edge and a flank face formed in an inclined manner toward the opening portion in communication with the drill cutting edge polishing surface are formed at the outer peripheral end portion. And
An inclination angle formed by the drill cutting edge polished surface and the flank surface is within a range of 20 degrees to 26 degrees;
The length of the flank is 1.1 [mm] or more,
The drill cutting edge is brought into contact with the rotating grinding surface of the drill cutting edge, and the rake face and chisel cutting edge of the drill are brought into contact with the flank face, thereby forming the drill cutting edge and the chisel cutting edge. Forming an angle within a range of 154 to 160 degrees;
Whetstone for drill polishing equipment.
すくい面が形成されて軸線周りに回転される略円柱状のドリル本体を有し、
このドリル本体の先端の逃げ面から突出してチゼルが設けられており、
前記すくい面及び前記逃げ面により形成されるドリル切刃と、このドリル切刃に連なるチゼル切刃とのなす角度が154度〜160度である、
ドリル。
It has a generally cylindrical drill body with a rake face formed and rotated around an axis,
A chisel is provided to protrude from the flank at the tip of this drill body,
The angle formed by the drill cutting edge formed by the rake face and the flank and the chisel cutting edge connected to the drill cutting edge is 154 to 160 degrees.
drill.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020121268A (en) * 2019-01-30 2020-08-13 スズキ株式会社 Dilution device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020121268A (en) * 2019-01-30 2020-08-13 スズキ株式会社 Dilution device

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