JP2003211311A - Drill head guide pad - Google Patents
Drill head guide padInfo
- Publication number
- JP2003211311A JP2003211311A JP2002007447A JP2002007447A JP2003211311A JP 2003211311 A JP2003211311 A JP 2003211311A JP 2002007447 A JP2002007447 A JP 2002007447A JP 2002007447 A JP2002007447 A JP 2002007447A JP 2003211311 A JP2003211311 A JP 2003211311A
- Authority
- JP
- Japan
- Prior art keywords
- pad
- pad body
- drill head
- head
- main body
- 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
Classifications
-
- 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
Landscapes
- Drilling Tools (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、主として深孔切削
に使用されるドリルヘッドに関し、更に詳しくはドリル
ヘッドのヘッド本体の先端部外周面に取り付けられるガ
イドパッドに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill head mainly used for deep hole cutting, and more particularly to a guide pad attached to the outer peripheral surface of the tip portion of the head body of the drill head.
【０００２】[0002]
【従来の技術】深孔切削用のドリルヘッドは、ヘッド本
体先端面に切刃を取り付けると共に、ヘッド本体の先端
部外周面の周方向複数箇所にガイドパッドをビスによっ
て取り付けたもので、ヘッド本体に設けた取付孔を利用
して工具シャンク等の先端に取り付けられ、ドリルヘッ
ド側を回転させるか、又は被削材側を回転させることに
よって切削加工を行うものである。2. Description of the Related Art A drill head for deep hole cutting is one in which a cutting blade is attached to the tip end surface of the head body, and guide pads are attached to the outer peripheral surface of the tip end portion of the head body at a plurality of circumferential positions by screws. It is attached to the tip of a tool shank or the like by using the attachment hole provided in, and cutting is performed by rotating the drill head side or the work material side.
【０００３】このドリルヘッドのヘッド本体先端部外周
面に取り付けられるガイドパッドは超硬材によって形成
されるが、その全体が超硬材からなるガイドパッドをこ
れより軟質の鋼材からなるヘッド本体に直接ビス止めす
ると、ガイドパッドとヘッド本体との硬さの違いによっ
てガイドパッドを安定良く的確にヘッド本体に固定する
のが難しいことから、ガイドパッドを、超硬材製のパッ
ド本体と、このパッド本体を取り付ける鋼材製の取付台
座とにより形成して、パッド本体を取付台座にロー付け
によって固着し、取付台座をヘッド本体の先端部外周面
にビス止めするようにしたものが知られている。The guide pad attached to the outer peripheral surface of the head main body of this drill head is made of a super hard material. The guide pad made entirely of a super hard material is directly attached to the head main body made of a softer steel material. When screwed, it is difficult to fix the guide pad to the head body stably and accurately due to the difference in hardness between the guide pad and the head body. It is known that the pad main body is fixed to the mounting base by brazing, and the mounting base is screwed to the outer peripheral surface of the tip end portion of the head main body.
【０００４】図３の（Ａ）は上記のようなパッド本体１
６と取付台座１５とからなる従来のガイドパッド１４を
示す正面図、（Ｂ）は側面図であり、（Ｃ）は同ガイド
パッド１４をドリルヘッド１のヘッド本体２の先端部外
周面に取り付けた状態を示す平面図である。ガイドパッ
ド１４は、超硬材よりなるパッド本体１６と、これを取
り付ける鋼材よりなる取付台座１５とによって形成され
る。取付台座１５は、長手方向中央部にビス止め部１７
を形成すると共に、ビス止め部１７を挟んでその両側に
パッド本体取付部１８，１８を形成したもので、各パッ
ド本体取付部１８は、（Ｃ）から分かるように、パッド
本体１６の裏面１６ａが当接する座部１８ａと、ドリル
ヘッド回転方向（矢印Ｈ）に関するパッド本体１６の前
後両側面１６ｂ，１６ｃが当接する側壁部１８ｂ，１８
ｃとによって横断面コ字状に形成され、しかしてこの断
面コ字状のパッド本体取付部１８にパッド本体１６が嵌
合されて、このパッド本体１６の裏面１６ａが座部１８
ａの内面にロー付けされると共に、パッド本体１６の両
側面１６ｂ，１６ｃが側壁部１８ｂ，１８ｃの夫々内側
面にロー付けされ、これによって各パッド本体１６がパ
ッド本体取付部１８に夫々一体的に取り付け固定され
る。FIG. 3A shows a pad body 1 as described above.
6 is a front view showing a conventional guide pad 14 including the mounting base 15 and the mounting base 15, (B) is a side view, and (C) is the guide pad 14 attached to the outer peripheral surface of the tip portion of the head body 2 of the drill head 1. It is a top view showing the state where it was opened. The guide pad 14 is formed by a pad body 16 made of a super hard material and a mounting base 15 made of a steel material for mounting the pad body 16. The mounting pedestal 15 has a screw stop 17 at the center in the longitudinal direction.
And the pad body mounting portions 18 and 18 are formed on both sides of the screw fastening portion 17 so that each pad body mounting portion 18 has a back surface 16a of the pad body 16 as seen from (C). And the side wall portions 18b, 18 with which the front and rear side surfaces 16b, 16c of the pad body 16 in the rotation direction of the drill head (arrow H) abut.
is formed in a U-shaped cross section by c and the pad main body 16 is fitted to the pad main body attachment portion 18 having a U-shaped cross section, and the back surface 16a of the pad main body 16 has a seat portion 18
While being brazed to the inner surface of a, both side surfaces 16b and 16c of the pad main body 16 are brazed to the inner side surfaces of the side wall portions 18b and 18c, respectively, whereby each pad main body 16 is integrated with the pad main body mounting portion 18, respectively. It is attached and fixed to.
【０００５】尚、取付台座１５のビス止め部１７を挟ん
でその両側にパッド本体取付部１８，１８を形成して、
両パッド本体取付部１８，１８に夫々パッド本体１６を
取り付けているが、取付台座５をヘッド本体２に取り付
ける際には、両パッド本体取付部１８，１８の何れか一
方がヘッド本体２の先端部外周面に位置するように取り
付けられ、そしてパッド本体６が摩耗した時などに取付
台座１５を反転して付け替えることにより、他方のパッ
ド本体１６を使用できるようになっている。Incidentally, the pad main body mounting portions 18, 18 are formed on both sides of the screw fixing portion 17 of the mounting pedestal 15 so as to sandwich it.
Although the pad main body 16 is attached to both the pad main body attaching portions 18 and 18, respectively, when attaching the attachment base 5 to the head main body 2, one of the both pad main body attaching portions 18 and 18 is the tip of the head main body 2. The other pad body 16 can be used by reversing the attachment pedestal 15 and reattaching it when the pad body 6 is worn or the like.
【０００６】[0006]
【発明が解決しようとする課題】上記のように取付台座
１５に形成した横断面コ字状のパッド本体取付部１８に
パッド本体１６を嵌合してロー付けすることにより形成
される従来構造のガイドパッド１４によれば、超硬材よ
りなるパッド本体１６と鋼材よりなるパッド本体取付部
８との線膨張係数の違いから、ロー付けの際にパッド本
体６とパッド本体取付部８との間に熱応力の差を生じ
て、パッド本体６側にクラックを形成し、ガイドパッド
としての役割を果たすことができなくなる、と云う問題
がある。A conventional structure formed by fitting the pad body 16 to the pad body mounting portion 18 having a U-shaped cross section formed on the mounting base 15 and brazing the pad body 16 as described above. According to the guide pad 14, due to the difference in linear expansion coefficient between the pad body 16 made of a super hard material and the pad body mounting portion 8 made of steel material, the pad body 6 and the pad body mounting portion 8 are not connected to each other when brazing. Therefore, there is a problem that a difference in thermal stress is generated, a crack is formed on the pad body 6 side, and the pad cannot serve as a guide pad.
【０００７】即ち、パッド本体１６を形成する超硬材、
例えばタングステンカーバイトの線膨張係数が約６．０
×１０-6であり、パッド本体取付部８を形成する鋼材の
線膨張係数が約１１．５×１０-6であることから、横断
面コ字状のパッド本体取付部１８にパッド本体１６を嵌
合し、５００℃近い高温でロー付けして両者を一体に結
合した後、結合した両者が常温まで温度降下した時に、
パッド本体１６側に大きな引張応力が発生して、パッド
本体１６が、図３の（Ｃ）に示すように横断面コ字状を
成すパッド本体取付部１８の両側壁部１８ｂ，１８ｂに
よって引っ張られた状態となり、これによりパッド本体
１６の表面にクラックが発生する。That is, a super hard material forming the pad body 16,
For example, the coefficient of linear expansion of tungsten carbide is about 6.0.
× is 10 -6, the coefficient of linear expansion of the steel material forming the pad body mounting portion 8 is approximately 11.5 × 10 -6, the pad body 16 in cross section U-shaped pad body mounting portion 18 After fitting and brazing at a high temperature of about 500 ° C to bond them together, when the temperature of both bonded parts drops to room temperature,
A large tensile stress is generated on the pad body 16 side, and the pad body 16 is pulled by the side wall portions 18b and 18b of the pad body mounting portion 18 having a U-shaped cross section as shown in FIG. 3C. Then, a crack is generated on the surface of the pad body 16.
【０００８】本発明は、上記の課題に鑑み、パッド本体
をパッド本体取付部に対してロー付けする際に、パッド
本体に生じる熱応力を極力小さくして、クラックの発生
を回避し、ガイドパッドの機能を損なわないようにする
ことを目的とする。In view of the above problems, the present invention minimizes the thermal stress generated in the pad body when the pad body is brazed to the pad body mounting portion to avoid the occurrence of cracks and to prevent the guide pad. The purpose is not to impair the function of.
【０００９】[0009]
【課題を解決するための手段】請求項１に係る発明は、
ドリルヘッド１のヘッド本体２の先端部外周面２ｂにビ
スｂにより取り付けられるガイドパッド４であって、ビ
ス止め部７及びパッド本体取付部８を形成した鋼材製の
取付台座５と、この取付台座５のパッド本体取付部８に
ロー付けによって取り付けられる超硬材製のパッド本体
６とからなり、前記パッド本体取付部８は、パッド本体
６の裏面６ａが当接してロー付けされる座部８ａと、パ
ッド本体６のドリルヘッド回転方向後端側側面６ｂが当
接してロー付けされる支持壁部８ｂとによって横断面略
Ｌ字状に形成されていることを特徴とする。The invention according to claim 1 is
A guide pad 4, which is attached to the outer peripheral surface 2b of the tip portion of the head body 2 of the drill head 1 by a screw b, is a steel mounting base 5 on which a screw fixing portion 7 and a pad main body mounting portion 8 are formed, and this mounting base. 5, a pad body 6 made of a super hard material that is attached to the pad body attachment portion 8 of the pad 5 by brazing, and the pad body attachment portion 8 is a seat portion 8a to which the back surface 6a of the pad body 6 abuts and is brazed. And a supporting wall portion 8b to which the side face 6b on the rear end side of the pad main body 6 in the rotating direction of the drill head abuts and is brazed, are formed in a substantially L-shaped cross section.
【００１０】請求項２は、請求項１に記載のドリルヘッ
ド用ガイドパッドにおいて、取付台座５は、ビス止め部
７と、このビス止め部７を挟んでその両側に連設された
一対のパッド本体取付部８，８とによって形成されると
共に、両パッド本体取付部８，８はビス止め部７を中心
に回転対称状に形成されていることを特徴とする。According to a second aspect of the present invention, in the guide pad for a drill head according to the first aspect, the mounting pedestal 5 includes a screw stopper portion 7 and a pair of pads which are continuously provided on both sides of the screw stopper portion 7. It is characterized in that it is formed by the main body mounting portions 8 and 8 and that both pad main body mounting portions 8 and 8 are formed in rotational symmetry with the screw stopper 7 as the center.
【００１１】[0011]
【発明の実施の形態】図１の（Ａ）は本発明に係るガイ
ドパッド４を備えたドリルヘッド１の正面図、（Ｂ）は
同ドリルヘッド１の側面図であり、また図２の（Ａ）は
本発明に係るガイドパッド４の拡大正面図、（Ｂ）はガ
イドパッド４の拡大側面図、（Ｃ）はガイドパッド４を
ドリルヘッド１のヘッド本体２に取り付けた状態での平
面図である。図１に示すように、ドリルヘッド１には、
ヘッド本体２の円錐状先端面２ａに切刃３がビスａによ
って取り付けられると共に、ヘッド本体２の先端部外周
面２ｂの周方向複数箇所にガイドパッド４がビスｂによ
り取り付けられている。尚、図１において、９はヘッド
本体２の後端面に開口する取付孔、１０はヘッド本体２
の円錐状先端面２ａに開口する切屑取り入れ口である。1A is a front view of a drill head 1 having a guide pad 4 according to the present invention, FIG. 1B is a side view of the drill head 1, and FIG. A) is an enlarged front view of the guide pad 4 according to the present invention, (B) is an enlarged side view of the guide pad 4, and (C) is a plan view of the guide pad 4 attached to the head body 2 of the drill head 1. Is. As shown in FIG. 1, the drill head 1 includes
The cutting blade 3 is attached to the conical tip surface 2a of the head body 2 with screws a, and the guide pads 4 are attached to the tip outer peripheral surface 2b of the head body 2 at a plurality of circumferential positions with screws b. In FIG. 1, 9 is a mounting hole opened on the rear end surface of the head body 2, and 10 is a head body 2.
It is a chip intake port that opens to the conical tip surface 2a.
【００１２】以下に、本発明に係るガイドパッド４につ
いて説明すると、このガイドパッド４は、図２に示すよ
うに、鋼材よりなる取付台座５と、この取付台座５に取
り付けられる超硬材よりなるパッド本体６とによって形
成される。取付台座５は、長手方向中央部にビス止め部
７を形成すると共に、このビス止め部７を挟んでその両
側にパッド本体取付部８，８を形成したもので、ビス止
め部７にはビス挿通孔１１が設けてある。各パッド本体
取付部８は、図２の（Ｃ）から分かるように、パッド本
体６の裏面６ａが当接してロー付けされる座部８ａと、
ドリルヘッド１の回転方向（矢印Ｈ）に関するパッド本
体６の後端側側面６ｂが当接してロー付けされる支持壁
部８ｂとによって横断面Ｌ字状に形成されている。ここ
で、ドリルヘッド１の回転方向とは、被削材を固定させ
て、ドリルヘッド１を回転させる場合のドリルヘッド１
の回転方向と、ドリルヘッド１を固定させて、被削材を
回転させる場合にドリルヘッド１が被削材に対して相対
的に回転する場合のドリルヘッド１の回転方向との両方
を意味する。The guide pad 4 according to the present invention will be described below. As shown in FIG. 2, the guide pad 4 is composed of a mounting base 5 made of steel and a superhard material mounted on the mounting base 5. And the pad body 6. The mounting pedestal 5 has a screw stopper portion 7 formed in the central portion in the longitudinal direction, and pad body mounting portions 8, 8 formed on both sides of the screw stopper portion 7 so as to sandwich the screw stopper portion 7. An insertion hole 11 is provided. As can be seen from FIG. 2C, each pad main body attachment portion 8 has a seat portion 8a to which the back surface 6a of the pad main body 6 abuts and is brazed,
The rear side surface 6b of the pad body 6 with respect to the rotation direction (arrow H) of the drill head 1 is formed in an L-shaped cross section by the support wall portion 8b which is abutted and brazed. Here, the rotation direction of the drill head 1 refers to the case where the work head is fixed and the drill head 1 is rotated.
And the rotation direction of the drill head 1 when the drill head 1 rotates relative to the work material when the drill head 1 is fixed and the work material is rotated. .
【００１３】また、図２の（Ａ）から分かるように、取
付台座５の両パッド本体取付部８，８は、ビス止め部７
を中心に回転対称状に形成されている。即ち、ガイドパ
ッド４の正面図である図２の（Ａ）において、ビス止め
部７の上側にある横断面Ｌ字状のパッド本体取付部８は
その支持壁部８ｂが左側に位置し、ビス止め部７の下側
にあパッド本体取付部８はその支持壁部８ｂが右側に位
置し、従って取付台座５を図示の状態からビス止め部７
を中心に１８０°回転させると、取付台座５は回転前と
同じ配置関係となる。Further, as can be seen from FIG. 2A, both pad main body mounting portions 8 of the mounting base 5 are provided with screw fixing portions 7.
It is formed in a rotationally symmetric shape around. That is, in FIG. 2A which is a front view of the guide pad 4, the pad main body mounting portion 8 having an L-shaped cross section on the upper side of the screw fixing portion 7 has a support wall portion 8b located on the left side, and Below the stopper 7, the support wall 8b of the pad main body mounting portion 8 is located on the right side, so that the mounting base 5 is screwed from the state shown in the drawing.
When it is rotated by 180 ° about, the mounting pedestal 5 has the same positional relationship as before the rotation.
【００１４】上記のような構造の取付台座５にパッド本
体６を取り付けるには、横断面Ｌ字状に形成されている
取付台座５の各パッド本体取付部８にパッド本体６を嵌
め込み、このパッド本体６の裏面６ａをパッド本体取付
部８の座部８ａに当接させると共に、パッド本体６のド
リルヘッド回転方向後端側側面６ｂをパッド本体取付部
８の支持壁部８ｂに当接させた状態で、パッド本体６の
裏面６ａ及び側面６ｂとパッド本体取付部８の座部８ａ
及び支持壁部８ｂをロー付けすることにより、各パッド
本体取付部８にパッド本体６を一体的に固着することが
できる。To mount the pad main body 6 on the mounting base 5 having the above structure, the pad main body 6 is fitted into each pad main body mounting portion 8 of the mounting base 5 formed in an L-shaped cross section, and the pad main body 6 is attached. The back surface 6a of the main body 6 was brought into contact with the seat portion 8a of the pad main body mounting portion 8, and the rear end side surface 6b of the pad main body 6 in the drill head rotation direction was brought into contact with the support wall portion 8b of the pad main body mounting portion 8. In this state, the back surface 6a and the side surface 6b of the pad body 6 and the seat portion 8a of the pad body mounting portion 8
Also, by brazing the support wall portion 8b, the pad body 6 can be integrally fixed to each pad body attachment portion 8.
【００１５】このようにパッド本体取付部８にパッド本
体６をロー付けして固着する際に、このパッド本体取付
部８が、図３に示す従来のパッド本体取付部１８のよう
に座部１８ａと両側壁部１８ｂ，１８ｃとで断面コ字状
に形成されたものではなく、図２（Ｃ）のようにパッド
本体６の裏面６ａが当接してロー付けされる座部８ａ
と、パッド本体６のドリルヘッド回転方向後端側側面６
ｂが当接してロー付けされる支持壁部８ｂとで断面Ｌ字
状にされているから、例えば４５０℃でロー付けしてパ
ッド本体６とパッド本体取付部８とを一体に結合した
後、両者が常温まで温度降下した時に、パッド本体６に
対しパッド本体取付部８が大きく収縮して、パッド本体
取付部８の支持壁部８ｂが外向きに反り変形しても、パ
ッド本体６は片方の側面６ｂだけがパッド本体取付部８
の支持壁部８ｂによって引っ張られる状態になるから、
このパッド本体６に生ずる引張応力（熱応力）は、パッ
ド本体６の両側面６ｂ，６ｃ側が引っ張られる場合に比
べると、はるかに小さくなり、尚且つパッド本体６に発
生する引張応力は他方側の開放側面６ｃ側で吸収される
ことになり、そのためパッド本体６の表面側にクラック
が発生するようなことはなく、またロー付け部分に亀裂
等が発生することもない。When the pad body 6 is brazed and fixed to the pad body mounting portion 8 as described above, the pad body mounting portion 8 is seated like the conventional pad body mounting portion 18 shown in FIG. And the side wall portions 18b and 18c are not formed in a U-shaped cross section, but a seat portion 8a to which the back surface 6a of the pad body 6 abuts and is brazed as shown in FIG. 2C.
And the side face 6 on the rear end side of the pad body 6 in the rotation direction of the drill head.
Since the b is abutted and brazed to the supporting wall portion 8b to have an L-shaped cross section, for example, after brazing at 450 ° C. to integrally bond the pad body 6 and the pad body mounting portion 8, When both of them fall to room temperature, even if the pad body mounting portion 8 contracts greatly with respect to the pad body 6 and the support wall portion 8b of the pad body mounting portion 8 warps and deforms outward, one side of the pad body 6 Only the side surface 6b of the pad body mounting portion 8
Since it will be pulled by the support wall portion 8b of
The tensile stress (thermal stress) generated in the pad main body 6 is much smaller than that in the case where both side surfaces 6b and 6c of the pad main body 6 are pulled, and the tensile stress generated in the pad main body 6 is the other side. Since it is absorbed on the open side surface 6c side, no cracks are generated on the surface side of the pad body 6 and no cracks are generated on the brazed portion.
【００１６】上記のように形成されるガイドパッド４
は、ヘッド本体２の先端部外周面２ｂにヘッド本体軸方
向に長く形成されたガイドパッド嵌合溝１２に、図１及
び図２の（Ｃ）に示す状態に嵌合されて、ビスｂにより
ヘッド本体２に固定される。このビスｂは、ビス止め部
７のビス挿通孔１１からガイドパッド嵌合溝１２の底部
に設けられたヒス孔（図示せず）にねじ込まれて締め付
けられる。Guide pad 4 formed as described above
Is fitted in a guide pad fitting groove 12 formed on the outer peripheral surface 2b of the tip portion of the head body 2 in the axial direction of the head body in a state shown in FIGS. It is fixed to the head body 2. The screw b is screwed from the screw insertion hole 11 of the screw stopper 7 into a hist hole (not shown) provided at the bottom of the guide pad fitting groove 12 to be tightened.
【００１７】こうしてガイドパッド４を切刃３と共にヘ
ッド本体２に取り付けたドリルヘッド１の使用におい
て、ドリルヘッド１が図１の（Ａ）及び図２の（Ｃ）に
示す矢印Ｈ方向に回転し、あるいは被削材の回転によっ
てドリルヘッド１が矢印Ｈ方向に相対回転して被削材を
切削する時に、各ガイドパッド４のパッド本体６は、被
削材によってドリルヘッド１の回転方向Ｈと反対方向の
負荷を受けるが、パッド本体６のドリルヘッド回転方向
後端側側面６ｂがパッド本体取付部８の支持壁部８ｂに
ロー付けされているため、上記負荷によってパッド本体
６がパッド本体取付部８の座部８ａに対し剥離するよう
なことがない。In using the drill head 1 in which the guide pad 4 is attached to the head body 2 together with the cutting blade 3 in this way, the drill head 1 rotates in the direction of arrow H shown in FIGS. 1A and 2C. Alternatively, when the drill head 1 relatively rotates in the direction of the arrow H by the rotation of the work material to cut the work material, the pad body 6 of each guide pad 4 is moved in the rotation direction H of the drill head 1 depending on the work material. Although the load is applied in the opposite direction, since the side surface 6b of the pad body 6 on the rear end side in the drill head rotation direction is brazed to the support wall portion 8b of the pad body attachment portion 8, the pad body 6 is attached to the pad body 6 by the above load. It does not peel off from the seat portion 8a of the portion 8.
【００１８】また、このガイドパッド４は、取付台座５
の両パッド本体取付部８，８がビス止め部７を中心に回
転対称状に形成されているから、一方のパッド本体取付
部８に取り付けられて使用中のパッド本体６が摩耗した
り破損したような場合には、ビス止め部７のビスｂを外
して、他方のパッド本体６の取り付けられている新しい
パッド本体６がヘッド本体２の先端部側に位置するよう
に反転した状態に付け替えればよく、しかしてヘッド本
体２の先端部側に位置した新しいパッド本体６のドリル
ヘッド回転方向後端側側面６ｂは、付け替え前のヘッド
本体２の先端部側にあったパッド本体６と同様にパッド
本体取付部８の支持壁部８ｂによって支持されることに
なる。The guide pad 4 is attached to the mounting base 5.
Since both pad body mounting portions 8 and 8 are formed in a rotationally symmetrical manner about the screw stopper portion 7, the pad body 6 being used by being attached to one pad body mounting portion 8 is worn or damaged. In such a case, the screw b of the screw fixing portion 7 may be removed and the new pad body 6 to which the other pad body 6 is attached may be replaced so that the new pad body 6 is located on the tip side of the head body 2. Well, the rear side surface 6b of the new pad body 6 located on the tip side of the head body 2 in the direction of drill head rotation is the same as the pad body 6 on the tip side of the head body 2 before replacement. It is supported by the support wall portion 8b of the main body mounting portion 8.
【００１９】[0019]
【発明の効果】請求項１に係る発明のガイドパッドは、
取付台座のパッド本体取付部が、パッド本体の裏面が当
接してロー付けされる座部と、パッド本体のドリルヘッ
ド回転方向後端側側面が当接してロー付けされる支持壁
部とによって横断面略Ｌ字状に形成されるものであるか
ら、パッド本体とパッド本体取付部とを５００℃近い温
度でロー付けして一体に結合した後、両者が常温まで温
度降下した時に、パッド本体に対しパッド本体取付部が
大きく収縮して、パッド本体取付部の支持壁部が外向き
に反り変形しても、パッド本体は片方の側面だけがパッ
ド本体取付部の支持壁部によって引っ張られる状態にな
るから、このパッド本体に生ずる引張応力（熱応力）
は、パッド本体の両側面側が引っ張られるようになる従
来のガイドパッドに比べるとはるかに小さくなり、尚且
つパッド本体６に発生する引張応力は他方側の開放側面
６ｃ側で吸収されることになり、そのためパッド本体の
表面側にクラックが発生するようなことがなく、ロー付
け部分に亀裂等が発生することもない。The guide pad of the invention according to claim 1 is
The pad body mounting portion of the mounting pedestal is traversed by the seat portion where the back surface of the pad body abuts and is brazed, and the support wall portion where the rear side surface of the pad body in the rotating direction of the drill head abuts and is brazed. Since it is formed into a substantially L-shaped surface, the pad body and the pad body mounting portion are brazed at a temperature close to 500 ° C and integrally joined, and then when the temperature of both falls to room temperature, the pad body is On the other hand, even if the pad body mounting part contracts greatly and the supporting wall part of the pad body mounting part warps outward, only one side of the pad body is pulled by the supporting wall part of the pad body mounting part. Therefore, the tensile stress (thermal stress) generated in this pad body
Is much smaller than a conventional guide pad in which both side surfaces of the pad body are pulled, and the tensile stress generated in the pad body 6 is absorbed by the open side surface 6c on the other side. Therefore, the surface of the pad body is not cracked, and the brazing portion is not cracked.
【００２０】また、ドリルヘッドの使用に際して、ガイ
ドパッドのパッド本体は、被削材によってドリルヘッド
の回転方向と反対方向の負荷を受けるが、パッド本体の
ドリルヘッド回転方向後端側側面がパッド本体取付部の
支持壁部にロー付けされているから、上記の負荷によっ
てパッド本体がパッド本体取付部の座部から剥離するよ
うなことがない。When the drill head is used, the pad body of the guide pad receives a load in the direction opposite to the rotation direction of the drill head due to the work material, but the rear side surface of the pad body in the rotation direction of the drill head is the pad body. Since it is brazed to the support wall portion of the mounting portion, the pad body does not peel off from the seat portion of the pad body mounting portion due to the above load.
【００２１】請求項２に係る発明のガイドパッドによれ
ば、取付台座が、ビス止め部と、これを挟んでその両側
に連設された一対のパッド本体取付部とで形成されると
共に、両パッド本体取付部がビス止め部を中心に回転対
称状に形成されているから、一方のパッド本体が破損し
たような場合は、他方のパッド本体の取り付けられてい
る新しいパッド本体がヘッド本体の先端部側に位置する
ように反転した状態に付け替えればよく、しかして新し
いパッド本体のドリルヘッド回転方向後端側側面は、付
け替え前のヘッド本体先端部側にあったパッド本体と同
様にパッド本体取付部の支持壁部にで支持されることに
なり、付け替え作業に余分な手間がかからない。According to the guide pad of the second aspect of the invention, the mounting pedestal is formed of the screw stopper portion and the pair of pad main body mounting portions that are continuously provided on both sides of the screw stopper portion. Since the pad body mounting part is formed symmetrically around the screw stop part, if one pad body is damaged, the new pad body attached to the other pad body will be the tip of the head body. It can be replaced by flipping it so that it is located on the side of the head, and the side surface of the new pad body on the rear end side in the direction of drill head rotation is the same as the pad body on the tip side of the head body before replacement. Since it will be supported by the support wall of the section, extra work will not be required for replacement work.
【図１】 （Ａ）は本発明に係るガイドパッドを備えた
ドリルヘッドの正面図、（Ｂ）は同ドリルヘッド１の側
面図である。FIG. 1A is a front view of a drill head including a guide pad according to the present invention, and FIG. 1B is a side view of the drill head 1.
【図２】 （Ａ）は本発明に係るガイドパッドの拡大正
面図、（Ｂ）はガイドパッドの拡大側面図、（Ｃ）はガ
イドパッドをドリルヘッドのヘッド本体に取り付けた状
態での平面図である。2A is an enlarged front view of the guide pad according to the present invention, FIG. 2B is an enlarged side view of the guide pad, and FIG. 2C is a plan view of the guide pad attached to the head body of the drill head. Is.
【図３】 （Ａ）は従来のガイドパッドの拡大正面図、
（Ｂ）は同ガイドパッドの拡大側面図、（Ｃ）は同ガイ
ドパッドをドリルヘッドのヘッド本体に取り付けた状態
での平面図である。FIG. 3A is an enlarged front view of a conventional guide pad,
(B) is an enlarged side view of the guide pad, and (C) is a plan view of the guide pad attached to the head body of the drill head.
１ ドリルヘッド
２ ヘッド本体
２ａ ヘッド本体の先端面
２ｂ ヘッド本体の先端部外周面
３ 切刃
４ ガイドパッド
５ 取付台座
６ パッド本体
６ａ パッド本体の裏面
６ｂ パッド本体のドリルヘッド回転方向後端側
側面
７ ビス止め部
８ パッド本体取付部1 drill head 2 head body 2a tip surface 2b of the head body 2b outer peripheral surface of the tip portion of the head body 3 cutting edge 4 guide pad 5 mounting base 6 pad body 6a back surface 6b of pad body Screw stop part 8 Pad body mounting part
Claims (2)
外周面２ｂにビスｂにより取り付けられるガイドパッド
４であって、ビス止め部７及びパッド本体取付部８を形
成した鋼材製の取付台座５と、この取付台座５のパッド
本体取付部８にロー付けによって取り付けられる超硬材
製のパッド本体６とからなり、前記パッド本体取付部８
は、パッド本体６の裏面６ａが当接してロー付けされる
座部８ａと、パッド本体６のドリルヘッド回転方向後端
側側面６ｂが当接してロー付けされる支持壁部８ｂとに
よって横断面略Ｌ字状に形成されているドリルヘッド用
ガイドパッド。1. A mounting pad 5 made of steel, which is a guide pad 4 mounted on a tip outer peripheral surface 2b of a head main body 2 of a drill head 1 by a screw b, in which a screw stopper 7 and a pad main body mounting portion 8 are formed. And a pad main body 6 made of a super hard material which is attached to the pad main body mounting portion 8 of the mounting pedestal 5 by brazing.
Is a cross section of a seat portion 8a to which the back surface 6a of the pad body 6 is abutted and brazed, and a support wall portion 8b to which the side surface 6b of the pad body 6 on the rear end side in the drill head rotating direction is abutted and brazed. A guide pad for a drill head formed in a substantially L shape.
ス止め部７を挟んでその両側に連設された一対のパッド
本体取付部８，８とによって形成されると共に、両パッ
ド本体取付部８，８はビス止め部７を中心に回転対称状
に形成されている請求項１に記載のドリルヘッド用ガイ
ドパッド。2. The mounting pedestal 5 is formed by a screw stopper portion 7 and a pair of pad body mounting portions 8, 8 that are continuously provided on both sides of the screw stopper portion 7 and sandwich the screw stopper portion 7. The guide pad for a drill head according to claim 1, wherein the mounting portions 8 and 8 are formed in a rotationally symmetrical shape around the screw stopper 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002007447A JP3899271B2 (en) | 2002-01-16 | 2002-01-16 | Drill head guide pad |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002007447A JP3899271B2 (en) | 2002-01-16 | 2002-01-16 | Drill head guide pad |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003211311A true JP2003211311A (en) | 2003-07-29 |
| JP3899271B2 JP3899271B2 (en) | 2007-03-28 |
Family
ID=27645961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002007447A Expired - Fee Related JP3899271B2 (en) | 2002-01-16 | 2002-01-16 | Drill head guide pad |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3899271B2 (en) |
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| US20100158623A1 (en) * | 2008-12-19 | 2010-06-24 | Sandvik Intellectual Property Ab | Drill body as well as support pad therefor |
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| JP3899271B2 (en) | 2007-03-28 |
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