JPS63283809A - Drill reamer with nicks - Google Patents
Drill reamer with nicksInfo
- Publication number
- JPS63283809A JPS63283809A JP11562387A JP11562387A JPS63283809A JP S63283809 A JPS63283809 A JP S63283809A JP 11562387 A JP11562387 A JP 11562387A JP 11562387 A JP11562387 A JP 11562387A JP S63283809 A JPS63283809 A JP S63283809A
- Authority
- JP
- Japan
- Prior art keywords
- reamer
- burnishing
- cutting
- drill
- nicks
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 230000005855 radiation Effects 0.000 abstract 1
- 238000005553 drilling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010730 cutting oil Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/02—Twist drills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/08—Side or plan views of cutting edges
- B23B2251/087—Cutting edges with a wave form
-
- 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
- B23B2251/241—Cross sections of the diameter of the drill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/44—Margins, i.e. the narrow portion of the land which is not cut away to provide clearance on the circumferential surface
- B23B2251/443—Double margin drills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/48—Chip breakers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/56—Guiding pads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2270/00—Details of turning, boring or drilling machines, processes or tools not otherwise provided for
- B23B2270/26—Burnishing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、超硬合金製のドリルリーマの改良に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an improvement of a drill reamer made of cemented carbide.
従来の照合金製のツイストドリルには、1個のランドに
複数のねじれ切れ刃とねじれ溝を形成したものがあるが
、近年のマシニングセンタ゛−1NC工作機械の普及や
ニーズの多様化に伴い、高速切削や乾切削ができること
、長寿命等がドリルに要求されるようになった。また、
水溶性切削油の普及に伴い、潤滑効果のような切削条件
が悪化している。このような状況の中で、ドリルには優
れた切削性能と切屑の排出性を有すること、剛性を有す
ることが要求される。さらに、加工能率の向上という観
点から、ドリル加工とリーマ加工が同時にできるドリル
(ドリルリーマ)が望まれており、このようなドリルリ
ーマを実現するには加工穴の仕上面精度を通常のリーマ
仕上加工程度以上に確保しなければらない。Some conventional twist drills made of collated metal have multiple twisted cutting edges and twisted grooves formed on one land, but with the recent spread of machining center-1NC machine tools and the diversification of needs, Drills are now required to be capable of high-speed cutting, dry cutting, and have a long life. Also,
With the spread of water-soluble cutting oils, cutting conditions such as lubrication effects have deteriorated. Under these circumstances, drills are required to have excellent cutting performance, chip evacuation properties, and rigidity. Furthermore, from the perspective of improving machining efficiency, a drill (drill reamer) that can perform drilling and reaming at the same time is desired, and in order to realize such a drill reamer, the finished surface accuracy of the machined hole must be maintained at the same level as normal reamer finishing. It is necessary to secure more than that.
しかしながら、上記のツイストドリルは、ねじれ切れ刃
が多数あるため切削熱、切削抵抗が太きい等切削性能が
十分でないばかりか、剛性、切屑の排出性についても十
分ではなく、また面精度をリーマ仕上加工程度以上にす
ることは勿論できなかった。However, since the above twist drill has many twisted cutting edges, it not only has insufficient cutting performance such as high cutting heat and cutting resistance, but also lacks sufficient rigidity and chip evacuation. Of course, it was not possible to do anything beyond the level of processing.
そこでこの発明は、優れた切削性能を有し、且つ剛性が
あり、切屑の排出性に優れたドリルリーマを従供するこ
とを目的としている。Therefore, an object of the present invention is to provide a drill reamer that has excellent cutting performance, is rigid, and has excellent chip evacuation properties.
この発明は、リーマバーニシング切り刃(5)にニック
(7)をドリル先端側軸線(8)に対して左上がり右下
がりに傾斜して形成し、刃部(4)の各リーマバーニシ
ング切り刃(5)のニック(7)をずれ量Z
Z= x+’i’
X:1条のリーマバーニシング切れ刃におけるニックの
刃幅
Y:ニック幅
N:刃部に形成されたリーマバーニシング切れ刃の条数
をもって配列したものである。In this invention, the reamer burnishing cutting edge (5) is formed with a nick (7) inclined upward to the left and downward to the right with respect to the drill tip side axis (8), and each reamer burnishing cutting edge of the blade (4) is Amount of deviation of the nick (7) on the blade (5) Z Z = x + 'i' They are arranged according to the number of blades.
この発明は、複数のリーマバーニシング切れ刃(5)に
ニック(7)を形成している。そのため、ニック(7)
から切削熱を放散し、切削抵抗を低減して摩擦熱の発生
を抑えビビリのない安定な切削を可能にし、リーマバー
ニシング切り刃(5)に剛性を与え、切屑の排出を促進
することができる。しかも、ニック(7)が被削材の表
面をヤスリのように研磨し、バーニシングを行う。。In this invention, nicks (7) are formed on a plurality of reamer burnishing cutting edges (5). Therefore, Nick (7)
Dissipates cutting heat from the reamer burnishing cutting edge (5), reduces cutting resistance, suppresses generation of frictional heat, enables stable cutting without chatter, provides rigidity to the reamer burnishing cutting blade (5), and promotes chip evacuation. can. Moreover, the nick (7) polishes the surface of the workpiece like a file and performs burnishing. .
また、ニック(7)をドリル先端側軸線(8)に対して
左上がり右下がりに傾斜させているので、被削材の表面
にねじやすしをつけることがなくなり表面仕上げが可能
になる。Further, since the nick (7) is inclined upward to the left and downward to the right with respect to the axis (8) on the tip side of the drill, there is no need to attach screws or scissors to the surface of the workpiece, making it possible to finish the surface.
また、刃部(4)の各リーマバーニシング切れ刃(5)
のニック(7)をずれ量2をもって配列しているので、
仕上げ残すことなく且つ重複することなく被削材表面全
体を一様に研磨することができる。In addition, each reamer burnishing cutting edge (5) of the blade part (4)
Since the nicks (7) are arranged with a deviation of 2,
The entire surface of the workpiece can be polished uniformly without leaving any unfinished area or overlapping.
この発明の一実施例を図面に基づき説明する。 An embodiment of this invention will be described based on the drawings.
第1図及び第2図に示すように、この発明に係るドリル
リーマ(1)は、2条のランド(2)とねじれ溝(3)
が形成された刃部(4)を有する、各ランド(2)には
複数のリーマバーニシング ・切り刃(5)とリーマバ
ーニシング切屑排出用溝(6)を形成している。リーマ
バーニシング切れ刃(5)は、リーマバーニシング切屑
排出用溝(6)と同数又はそれ以上形成するものとし、
この実施例では1個のランド(2)にリーマバーニシン
グ切れ刃(5)を3条、リーマバーニシング切屑排出用
溝(6)を2条形成している。As shown in FIGS. 1 and 2, the drill reamer (1) according to the present invention has two lands (2) and a helical groove (3).
Each land (2) has a blade portion (4) formed with a plurality of reamer burnishing cutting blades (5) and a reamer burnishing chip discharge groove (6). The reamer burnishing cutting edge (5) shall be formed in the same number or more as the reamer burnishing chip discharge groove (6),
In this embodiment, three reamer burnishing cutting edges (5) and two reamer burnishing chip discharge grooves (6) are formed on one land (2).
刃部(4)全体で6条あるリーマバーニシング切れ刃(
5)にはニック(7)を形成している。The reamer burnishing cutting edge (4) has 6 grooves in the entire blade part (4).
A nick (7) is formed in 5).
ニック(7)はドリル先端側軸線(8)に対して左上が
り右下がりに傾斜して形成され、その角度(ニック傾斜
角(9))は5″〜20″が望ましい。6条のリーマバ
ーニシング切れ刃(5)のニック(7)は、ずれ量Z
X+Y
2 =
x:同一のリーマバーニシング切れ刃におけるニック間
の刃幅
Y:二ック幅
N:刃部に形成されたリーマバーニシング切れ刃の条数
をもって配列されている。この実施例ではN=6という
ことになる。The nick (7) is formed to be inclined upward to the left and downward to the right with respect to the drill tip side axis (8), and its angle (nick inclination angle (9)) is preferably 5'' to 20''. The nick (7) of the 6-strip reamer burnishing cutting edge (5) has a deviation amount Z The formed reamer burnishing cutting edges are arranged in a number of rows. In this example, N=6.
また、ニック(7)の断面形状は、第8図に示す図面の
ほか、三角形(第9図)、四角形であってもよい。Further, the cross-sectional shape of the nick (7) may be triangular (FIG. 9) or quadrangular, in addition to the shape shown in FIG. 8.
さらに、刃部(4)の先端には第4図に示すように一対
の切れ刃(10)が形成されている。この一対の切れ刃
(10)は互いに平行に設けられると共にニック(7)
を形成している。しかも、各切れ刃(10)に接して細
幅の先端ランド(2番面)(11)が設けられている。Furthermore, a pair of cutting edges (10) are formed at the tip of the blade portion (4) as shown in FIG. The pair of cutting edges (10) are provided parallel to each other, and the nicks (7)
is formed. Moreover, a narrow tip land (second surface) (11) is provided in contact with each cutting edge (10).
そして、この先端ランド(11)に接して3番面(12
)が形成されている。同時に先端ランド(11)の反対
側に、切れ刃(10)に接し、且つドリル中心軸を越え
てドリル中心軸にシンニングが施されており、第4図及
び第5図に示すように、切れ刃(10)に連続して横中
央線A−Aを越えた部分に1対の先端ランド角部(13
)が形成されている。すなわち、切れ刃(10)と先端
ランド角部(13)に接し、先端ランド(11)と反対
側の側面(切れ刃(10)のすくい面)にシンニング部
(14)を形成している。上記先端ランド角部(13)
は切れ刃として形成されておらず、その長さはドリル中
心軸より約2mm以下としている。Then, the third surface (12) is in contact with this tip land (11).
) is formed. At the same time, on the opposite side of the tip land (11), the drill center axis is thinned in contact with the cutting edge (10) and beyond the drill center axis, as shown in FIGS. 4 and 5. Continuing with the blade (10), a pair of tip land corners (13
) is formed. That is, a thinning portion (14) is formed on the side surface (rake surface of the cutting edge (10)) that is in contact with the cutting edge (10) and the tip land corner (13) and opposite to the tip land (11). Above tip land corner (13)
is not formed as a cutting edge, and its length is approximately 2 mm or less from the center axis of the drill.
次に、以上の構成からなるドリルリーマ(1)の使用状
態について説明する。Next, the usage state of the drill reamer (1) having the above configuration will be explained.
ストレートシャンクを機械に取り付け(図示せず)、ド
リルリーマ(1)を高速回転させて被削材に六開けを行
うと、6条のリーマバーニシング切れ刃(5)が被削材
を切削する。この切削と同時にニック(7)が穴内面を
ヤスリのように研磨し、バーニシングを行う。また、ニ
ック(7)は、リーマバーニシング切れ刃(5)の切削
によって生じた切削熱を放散すると共に、その切削抵抗
を低減し摩擦熱の発生を抑えとビリのない安定な切削を
可能にする。また、ニック(7)を形成したことにより
、リーマバーニシング切れ刃(5)に剛性を与え、切屑
の排出を促進する。When the straight shank is attached to the machine (not shown) and the drill reamer (1) is rotated at high speed to make six holes in the workpiece, the six reamer burnishing cutting edges (5) cut the workpiece. At the same time as this cutting, a nick (7) polishes the inner surface of the hole like a file to perform burnishing. In addition, the nick (7) dissipates the cutting heat generated by cutting the reamer burnishing cutting edge (5), reduces the cutting resistance, suppresses the generation of frictional heat, and enables stable cutting without burrs. do. Further, by forming the nick (7), rigidity is imparted to the reamer burnishing cutting edge (5), and the discharge of chips is promoted.
また、第6図及び第7図に示すように、ニック(7)を
ドリル先端側軸線(8)に対して左上がり右下がりに傾
斜させているので、被削材の表面にねじやすしをつける
ことがなくなる。In addition, as shown in Figures 6 and 7, the nick (7) is tilted upward to the left and downward to the right with respect to the drill tip axis (8), so that screws and slits can be formed on the surface of the workpiece. Things will go away.
さらに、第8図(3条のリーマバーニシング切れ刃(5
)のニック配列のみを示す)に示すように、6条のリー
マバーニシング切れ刃(5)のニック(7)を、ずれ量
Zをもって配列している。Furthermore, Fig. 8 (3-row reamer burnishing cutting edge (5
) As shown in ), the nicks (7) of the six reamer burnishing cutting edges (5) are arranged with a deviation amount Z.
すなわち6条のリーマバーニシング切れ刃(5)のニッ
ク(7)は、ニック幅Yが離れることなく且つ重複する
ことなく連続して刃部(4)先端に向ってずれている。That is, the nicks (7) of the six reamer burnishing cutting edges (5) are continuously shifted toward the tip of the blade portion (4) without the nick widths Y being separated or overlapping.
従って、ニック(7)は穴内面を仕上げ残すことなく一
様に研磨することができる。Therefore, the nick (7) can be uniformly polished without leaving the inner surface of the hole unfinished.
ところで、ニックを形成した切削工具にラフィングエン
ドミルがあるが、ラフィングエンドミルは、単にニック
を螺旋状に形成したものにすぎず、みぞ切りや側面削り
等を行う際に粗仕上げまでを行うものである。これに対
して、ドリルリーマ(1)は、ニック(7)を左上がり
右下がりに傾斜させ、ずれ量Zをもって配列して有する
ので、穴開けと同時にリーマ仕上加工程度以上まで行う
ことができる。By the way, a roughing end mill is a cutting tool with a nick formed therein, but a roughing end mill is simply a nick formed in a spiral shape, and is used for rough finishing when performing grooving, side milling, etc. . On the other hand, the drill reamer (1) has the nicks (7) inclined upward to the left and downward to the right, and arranged with a deviation amount Z, so that it is possible to simultaneously perform drilling and finishing to a level higher than the level of reaming.
尚、リーマバーニシング切れ刃(5)の外周のマシン幅
は0.7〜0.5mmが望ましく、この範囲より太き(
なると溶着の原因となる。In addition, the machine width of the outer periphery of the reamer burnishing cutting edge (5) is preferably 0.7 to 0.5 mm, and thicker than this range (
This may cause welding.
次に、この発明に係るドリルリーマ(1)を用いて表1
に示す切削試験を行った。Next, using the drill reamer (1) according to the present invention, Table 1
A cutting test was conducted as shown in .
(以下余白)
表1
結果
切削試験■、■ともに乾式切削で大面精度1.5S以下
まで仕上げることができる。またドリルリーマの寿命は
、従来の工具が穴加工数1万〜2万個であるのに対し、
切削試験■で12万個、切削試験めで5万個であった。(Leaving space below) Table 1 Results Cutting Test Both ■ and ■ can be finished with a large surface accuracy of 1.5S or less by dry cutting. Additionally, the lifespan of a drill reamer is 10,000 to 20,000 holes drilled with conventional tools.
The number of pieces was 120,000 in the cutting test (■) and 50,000 in the cutting test.
その他、難切材として知られる、インコーネル鋼、ステ
ンレス鋼等についてもドリルリーマ(1)は従来に比゛
べ著しい寿命の向上が認められた。In addition, the drill reamer (1) has been found to have a significantly longer lifespan than conventional drill reamers for materials such as Incornell steel and stainless steel, which are known to be difficult to cut.
この発明は、以上のような構成とした二ツク(7)によ
り、切削熱の放散、切削抵抗の低減を図ってドリルリー
マの切削性能を向上させることができると共に剛性、切
屑の排出性を高めることができ、また穴開けからリーマ
仕上げまでを、り一マ仕上加工程度以上の面精度で行う
ことができるThe present invention is capable of improving the cutting performance of the drill reamer by dissipating cutting heat and reducing cutting resistance, as well as increasing rigidity and chip evacuation performance, by using the second feature (7) configured as described above. It is also possible to perform everything from drilling to reaming with a surface accuracy that is better than that of reaming.
第1図乃至第9図はこの発明の一実施例を示す図面。第
1図はこの発明に係るニック付ドリルリーマの斜視図。
第2図は同側面図。第3図は刃部の断面図。第4図は刃
部先端付近の拡大図。第5図は刃部先端面の説明図。第
6図はリーマバーニシング切れ刃に形成したニックの拡
大図。第7図は3条のリーマバーニシング切れ刃のニッ
クの配列状態を示す展開図。第8図ta)〜(C)はニ
ックのずれ量の説明図であって、(alは第7図のa−
a縦断面、(b)は同図b−b縦断面、(C)は同図C
−C縦断面。第9図はニックの断面形状の変形例を示す
部分断面図。1 to 9 are drawings showing one embodiment of the present invention. FIG. 1 is a perspective view of a drill reamer with a nick according to the present invention. Figure 2 is a side view of the same. Figure 3 is a cross-sectional view of the blade. Figure 4 is an enlarged view of the vicinity of the tip of the blade. FIG. 5 is an explanatory diagram of the tip end surface of the blade. Figure 6 is an enlarged view of the nick formed on the reamer burnishing cutting edge. FIG. 7 is a developed view showing the arrangement of nicks on a three-strip reamer burnishing cutting edge. FIG. 8 ta) to (C) are explanatory diagrams of the amount of deviation of the nick, where (al is a-a in FIG. 7).
a Longitudinal section, (b) is the b-b longitudinal section in the same figure, (C) is C in the same figure
-C longitudinal section. FIG. 9 is a partial sectional view showing a modification of the cross-sectional shape of the nick.
Claims (1)
成され、1条のランド(2)について複数のリーマバー
ニシング切れ刃(5)とリーマバーニシング切屑排出用
溝(6)を有するドリルにおいて、リーマバーニシング
切れ刃(5)にニック(7)がドリル先端側軸線(8)
に対して左上がり右下がりに傾斜して形成され、刃部(
4)の各リーマバーニシング切れ刃(5)のニック(7
)がずれ量ZZ=(X+Y)/N X:1条のリーマバーニシング切れ刃にお けるニック間の刃幅 Y:ニック幅 N:刃部に形成されたリーマバーニシング 切れ刃の条数 をもって配列されていることを特徴とするニック付ドリ
ルリーマ。[Claims] 1. The blade portion (4) is formed of a land (2) and a twisted groove (3), and one land (2) has a plurality of reamer burnishing cutting edges (5) and reamer burnishing. In a drill with a chip discharge groove (6), a nick (7) on the reamer burnishing cutting edge (5) is located on the drill tip side axis (8).
The blade part (
4) Each reamer burnishing cutting edge (5) has a nick (7)
) is the amount of deviation ZZ=(X+Y)/N A drill reamer with a nick.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11562387A JPS63283809A (en) | 1987-05-12 | 1987-05-12 | Drill reamer with nicks |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11562387A JPS63283809A (en) | 1987-05-12 | 1987-05-12 | Drill reamer with nicks |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS63283809A true JPS63283809A (en) | 1988-11-21 |
JPH0310451B2 JPH0310451B2 (en) | 1991-02-13 |
Family
ID=14667235
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11562387A Granted JPS63283809A (en) | 1987-05-12 | 1987-05-12 | Drill reamer with nicks |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS63283809A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4957397A (en) * | 1989-09-08 | 1990-09-18 | Huff Mark J | Cutting tool |
US5503237A (en) * | 1993-11-11 | 1996-04-02 | Hilti Aktiengesellschaft | Helical drill |
CN102581355A (en) * | 2012-03-27 | 2012-07-18 | 周安善 | Twist drill for drilling precision holes on high-strength and high-hardness alloy materials |
CN103706846A (en) * | 2012-10-01 | 2014-04-09 | 李仕清 | Centering spiral tool with combined positioning and combined cutting functions |
JP2017202541A (en) * | 2016-05-11 | 2017-11-16 | 有限会社栄進機工 | Drill reamer |
EP2550123B1 (en) | 2010-03-25 | 2017-11-22 | Klenk GmbH & Co. KG | Drilling tool |
KR20240036820A (en) * | 2022-09-14 | 2024-03-21 | 예상백 | Burnishing drill having joining structure of guide pad tip |
-
1987
- 1987-05-12 JP JP11562387A patent/JPS63283809A/en active Granted
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4957397A (en) * | 1989-09-08 | 1990-09-18 | Huff Mark J | Cutting tool |
US5503237A (en) * | 1993-11-11 | 1996-04-02 | Hilti Aktiengesellschaft | Helical drill |
EP2550123B1 (en) | 2010-03-25 | 2017-11-22 | Klenk GmbH & Co. KG | Drilling tool |
CN102581355A (en) * | 2012-03-27 | 2012-07-18 | 周安善 | Twist drill for drilling precision holes on high-strength and high-hardness alloy materials |
CN103706846A (en) * | 2012-10-01 | 2014-04-09 | 李仕清 | Centering spiral tool with combined positioning and combined cutting functions |
JP2017202541A (en) * | 2016-05-11 | 2017-11-16 | 有限会社栄進機工 | Drill reamer |
KR20240036820A (en) * | 2022-09-14 | 2024-03-21 | 예상백 | Burnishing drill having joining structure of guide pad tip |
Also Published As
Publication number | Publication date |
---|---|
JPH0310451B2 (en) | 1991-02-13 |
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