JPH0765896B2 - How to measure the sphericity of a ball end mill - Google Patents
How to measure the sphericity of a ball end millInfo
- Publication number
- JPH0765896B2 JPH0765896B2 JP1103052A JP10305289A JPH0765896B2 JP H0765896 B2 JPH0765896 B2 JP H0765896B2 JP 1103052 A JP1103052 A JP 1103052A JP 10305289 A JP10305289 A JP 10305289A JP H0765896 B2 JPH0765896 B2 JP H0765896B2
- Authority
- JP
- Japan
- Prior art keywords
- end mill
- ball end
- measurement
- contact
- disc
- 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.)
- Expired - Lifetime
Links
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- A Measuring Device Byusing Mechanical Method (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- Machine Tool Sensing Apparatuses (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は工作機械に使用する工具特にボールエンドミル
の真球度を測定する方法に関する。Description: TECHNICAL FIELD The present invention relates to a method for measuring the sphericity of a tool used for a machine tool, particularly a ball end mill.
従来の技術 ボールエンドミルの先端球面刃部の真球度の直接測定は
現場的には非常に困難であって、測定室で計測されるも
の以外は殆ど測定されていないのが実情である。スロー
アウエイ形のボールエンドミルの真球度は非常に悪く一
般には0.1mm以上の誤差が考えられている。しかしこれ
迄は倣い加工機械,NC機械等のボールエンドミルを使用
する機械の精度との関係で特に問題になることはなかっ
た。2. Description of the Related Art Direct measurement of the sphericity of the tip spherical edge of a ball end mill is extremely difficult in the field, and it is the actual situation that it is hardly measured other than that measured in a measuring room. The sphericity of throw-away type ball end mills is very poor, and an error of 0.1 mm or more is generally considered. However, until now, there has been no particular problem in relation to the accuracy of machines that use ball end mills such as copying machines and NC machines.
発明が解決しようとする課題 近年NC機が高性能化されて曲面を高精度に加工できるよ
うになり、工具精度が直接加工精度に影響するので、使
用工具の真球度の測定法の開発が重要課題になってき
た。Problems to be Solved by the Invention In recent years, NC machines have become more sophisticated so that curved surfaces can be machined with high accuracy, and tool accuracy directly affects machining accuracy. It has become an important issue.
本発明はこのような要望に鑑みなされたもので、その目
的とするところは真球度精度が容易に計測でき、且本機
に取付けた状態で取付誤差も含めて計測でき工具補正と
して容易に利用できるボールエンドミルの真球度測定方
法を提供しようとするものである。The present invention has been made in view of such a demand, and the object thereof is to easily measure the sphericity accuracy, and also to measure the mounting error in a state where the sphericity is mounted on the machine, and to easily perform tool correction. It is intended to provide a sphericity measuring method for a ball end mill that can be used.
課題を解決するための手段 上述の目的を達成するために本発明は主軸に装着された
ボールエンドミルの球面刃部と固定位置にある計測器の
軸方向と直角に変位可能に支持された測定子先端に中心
で取付けられた測定円板とが互いの軸を直交する状態で
該測定円板の外周で接触するようにボールエンドミルを
測定位置に位置決めし、該測定位置における球面刃部中
心の座標と未接触状態の測定円板中心の座標とより求ま
る前記球面刃部中心と未接触状態の測定円板中心との距
離（Ｒ）と、接触時に計測器より検出される測定円板の
変位量εと、予め求められている測定円板の半径γ′と
によりボールエンドミルと測定円板との接点におけるボ
ールエンドミルの工具半径（γ）を算出し、この算出を
ボールエンドミルの表面上の各点において行うようにな
したものである。そしてボールエンドミルを回転させな
がら接触させることが好ましい。Means for Solving the Problems In order to achieve the above-mentioned object, the present invention is a measuring element supported so as to be displaceable at right angles to the spherical blade portion of a ball end mill mounted on a spindle and an axial direction of a measuring instrument in a fixed position. Position the ball end mill at the measurement position such that the measurement disk mounted at the center of the tip and the outer circumference of the measurement disk contact each other with their axes orthogonal to each other, and coordinate of the spherical blade center at the measurement position. And the distance (R) between the center of the spherical blade and the center of the measurement disk in the non-contact state, which is obtained from the coordinates of the center of the measurement disk in the non-contact state, and the displacement of the measurement disk detected by the measuring instrument at the time of contact. The tool radius (γ) of the ball end mill at the contact point between the ball end mill and the measurement disc is calculated from ε and the previously determined radius γ ′ of the measurement disc, and this calculation is performed at each point on the surface of the ball end mill. I'll do it in It is a roar. And it is preferable to make contact while rotating the ball end mill.
作用 NC位置決めされる主軸に装着されたボールエンドミルの
球面刃部をボールエンドミルと直交する座標値の知られ
た軸を中心とする測定円板の外周に接触させて測定円板
を変位させその変位量並びにボールエンドミルの球面刃
部中心の位置決め座標、並びに測定円板の中心の座標よ
り接触点における工具半径を算出する。ボールエンドミ
ルを回転させることにより切削に関与する突出した切刃
部の半径が測定される。Action NC The spherical edge of the ball end mill mounted on the spindle to be positioned is brought into contact with the outer circumference of the measuring disk centered on the axis with known coordinate values orthogonal to the ball end mill to displace the measuring disk and displace it. The tool radius at the contact point is calculated from the amount, the positioning coordinates of the center of the spherical edge of the ball end mill, and the coordinates of the center of the measurement disk. By rotating the ball end mill, the radius of the protruding cutting edge portion involved in cutting is measured.
実施例 以下第１図〜第３図を参照して説明する。例えば公知の
マシニングセンタ１においてコラム２上を上下（Ｚ軸）
方向に位置決めされるクロスレール３に載置され、水平
（Ｙ）軸方向に移動位置決めされる主軸頭４に鉛直方向
に軸承された主軸にボールエンドミル６が装着されてい
る。コラム２の側面内側には計測器７が水平に取付けら
れている。Example Hereinafter, description will be given with reference to FIGS. 1 to 3. For example, in the well-known machining center 1, up and down on the column 2 (Z axis)
A ball end mill 6 is mounted on a spindle that is vertically mounted on a cross rail 3 that is positioned in the vertical direction, and a spindle head 4 that is moved and positioned in the horizontal (Y) axis direction. A measuring instrument 7 is horizontally mounted inside the side surface of the column 2.
計測器７は例えば一次元のトレーサヘッドが用いられ器
体70に測定子71が軸方向に挿通され、測定子71に設けた
軸受球面72が器体70内の球面座73に旋回できるよう隙間
なく軸承されている。この測定子71は突出先端に高い真
円度を有する半径γ′の測定円板74が軸直角に固定され
反対端に円錐穴71aが削設され直角方向４本のばね75に
よって測定子71は中立状態に保持されている。また測定
子71と同軸上に軸方向に隙間なく摺動可能に検出子76が
器体70に軸承されており、その一端は球面77に形成され
他端には器体70に設けた差動トランスのコイル部78の中
心に位置するコア79が取付けられている。そして検出子
76は球面77が円錐穴71aにばね80で常に密着状態におか
れている。なお測定円板74は少なくとも90゜の範囲があ
れば目的が達成される。なお計測器７は二次元のトレー
サヘッドを用いることも可能である。The measuring instrument 7 uses, for example, a one-dimensional tracer head, and the probe 71 is axially inserted into the instrument body 70, and the bearing spherical surface 72 provided on the probe 71 is moved to a spherical seat 73 in the instrument body 70 so as to allow a clearance. Not supported. In this probe 71, a measuring disk 74 having a high circularity and a radius of γ ′ is fixed at the projecting tip at a right angle to the axis, a conical hole 71a is cut at the opposite end, and four springs 75 at right angles make the probe 71 It is held in a neutral state. A detector 76 is axially supported by the body 70 so as to be slidable in the axial direction coaxially with the probe 71, one end of which is formed on a spherical surface 77 and the other end of which is provided on the body 70. A core 79 located at the center of the coil portion 78 of the transformer is attached. And detector
The spherical surface 77 of 76 is always in close contact with the conical hole 71a by the spring 80. The object is achieved if the measuring disc 74 has a range of at least 90 °. The measuring instrument 7 may be a two-dimensional tracer head.
クロスレール３がＺ軸制御され主軸頭４がＹ軸制御され
て、ボールエンドミル６の先端球面刃部6aが計測器７の
測定円板74と接触して、変位させる位置即ち球面刃部中
心O1が座標y,zに位置決めされる。第１図において、ボ
ールエンドミル６の接触前の測定子71の測定円板74の中
心座標がｙ′,z′で既知であるとする。接触点Ｐは測定
円板74の中心Ｏとボールエンドミルの球面刃具6aの中心
O1とを結ぶ線上に位置する。ボールエンドミル６の接触
によって測定円板74がOO1線上で変位されその中心は
Ｏ′に移動する。ボールエンドミル６の軸心とO1Oのな
す角をθとするとき、θの角度位置における球面刃部6a
の半径γは ｙ＝ｙ′−R sinθ ｚ＝ｚ′＋R Cosθ 但しＲはOO1の長さである。なおエンドミル６のｙ位置
がｙ′位置より大きいときはｙ＝ｙ′＋R Sinθとな
る。The cross rail 3 is controlled in the Z axis and the spindle head 4 is controlled in the Y axis, and the tip spherical blade portion 6a of the ball end mill 6 comes into contact with the measuring disk 74 of the measuring instrument 7 to be displaced, that is, the spherical blade center O 1 is positioned at coordinates y, z. In FIG. 1, it is assumed that the center coordinates of the measuring disk 74 of the probe 71 before contact with the ball end mill 6 are known as y ′ and z ′. The contact point P is the center O of the measuring disc 74 and the center of the spherical cutting tool 6a of the ball end mill.
It is located on the line connecting O 1 . By the contact of the ball end mill 6, the measuring disc 74 is displaced on the line OO 1 and its center moves to O ′. When the angle between the axis of the ball end mill 6 and O 1 O is θ, the spherical blade 6a at the angle position of θ
The radius γ of y is y = y′−R sinθ z = z ′ + R Cosθ where R is the length of OO 1 . When the y position of the end mill 6 is larger than the y'position, y = y '+ RSinθ.
座標ｙ′,z′の測定円板中心Ｏに対してボールエンドミ
ル６の球面刃部6aの中心O1がy,zとなるように位置決め
されたのであるから直角三角形OO1Qの２辺ｙ′−y,z−
ｚ′及びθは既知であるからOO1＝ＲはNC装置内で演算
によって求められる。そこでエンドミル６の接触によっ
て測定円板74の中心ＯはOO1方向にＯ′迄に変位され、
この変位量が検出子76の軸方向の移動に変換されコア76
とコイル78で形成する差動トランスによって変位量εが
検出される。このεの値をもとに球面刃部6aの接触点Ｐ
における半径γは、γ＝Ｒ＋ε−γ′によって求めるこ
とができる。なお計測器７が二次元のトレーサヘッドで
Ｙ軸,Z軸の２方向のそれぞれの変位を検出するものでは によって求めることができる。Since the center O 1 of the spherical blade portion 6a of the ball end mill 6 is positioned at y, z with respect to the measurement disk center O at the coordinates y ', z', the two sides y of the right-angled triangle OO 1 Q. ′ −y, z−
Since z'and θ are known, OO 1 = R can be calculated in the NC unit. Then, the center O of the measuring disc 74 is displaced to O ′ in the OO 1 direction by the contact of the end mill 6,
This displacement amount is converted into movement of the detector 76 in the axial direction, and the core 76 is moved.
The displacement amount ε is detected by the differential transformer formed by the coil 78. Based on this value of ε, the contact point P of the spherical blade 6a
The radius γ at can be obtained by γ = R + ε−γ ′. It should be noted that in the case where the measuring instrument 7 is a two-dimensional tracer head that detects the displacement in each of the Y-axis and Z-axis directions. Can be sought by.
真球度の測定は切削に関与する部分で測定する必要のあ
ることは勿論であるが、その位置を正確に割出すことが
出来ない場合にはエンドミル６を回転して（この場合削
らないように逆回転が好ましい）最大のε値を変位量と
すれば良い。Needless to say, it is necessary to measure the sphericity at a portion related to cutting, but if the position cannot be accurately indexed, rotate the end mill 6 (in this case, do not cut). Reverse rotation is preferable.) The maximum ε value may be used as the displacement amount.
またエンドミル６のＹ軸,Z軸位置決め位置を変更して色
々のθについて半径γの値を知る。Further, the Y-axis and Z-axis positioning positions of the end mill 6 are changed to know the values of the radius γ for various θ.
本実施例ではボールエンドミル６を移動させたが計測器
７を移動位置決めすることも自由である。また相方を移
動位置決めも自由である。In this embodiment, the ball end mill 6 is moved, but the measuring instrument 7 can be moved and positioned freely. Moreover, it is possible to freely move and position the other party.
効果 上述のように構成したので、本発明は以下の効果を奏す
る。Effects With the above-described configuration, the present invention has the following effects.
請求項１の測定方法はボールエンドミルの球面刃部の半
径公差，真球度が容易に計測することができ工具精度の
向上ひいては加工精度を格段に向上しうるものである。According to the measuring method of the first aspect, the radius tolerance and the sphericity of the spherical blade of the ball end mill can be easily measured, so that the tool accuracy can be improved and the machining accuracy can be remarkably improved.
測定円板の変位を検出するトレーサヘッドを本機に設け
ることにより装置誤差を含めて加工時の球面刃部の真球
度が測定でき、その各θにおける測定値を工具補正値と
して記憶させて三次元の工具補正することにより三次元
曲面の加工精度を向上し且自動化を可能とするものであ
る。By equipping this machine with a tracer head that detects the displacement of the measuring disc, the sphericity of the spherical blade during machining can be measured, including equipment errors, and the measured values at each θ can be stored as tool correction values. By correcting the three-dimensional tool, the processing accuracy of the three-dimensional curved surface is improved and automation becomes possible.
請求項２の測定方法は測定位置を正確に割出せない場合
に好都合であり切削に関与する一番突出した点の半径が
測定される。The measuring method of claim 2 is convenient when the measuring position cannot be accurately determined, and the radius of the most protruding point involved in cutting is measured.
第１図はボールエンドミルと測定円板との接触状態の説
明図、第２図は一次元トレーサヘッドの説明図、第３図
はマシニングセンタにトレーサヘッドを取付けた説明図
である。 ５……主軸、６……ボールエンドミル ７……計測器、71……測定子 74……測定円板、76……検出子 78……コイル、79……コアFIG. 1 is an explanatory view of a contact state between a ball end mill and a measurement disk, FIG. 2 is an explanatory view of a one-dimensional tracer head, and FIG. 3 is an explanatory view in which a tracer head is attached to a machining center. 5 …… Spindle, 6 …… Ball end mill 7 …… Measuring instrument, 71 …… Measuring element 74 …… Measuring disk, 76 …… Sensor 78 …… Coil, 79 …… Core
Claims (2)
ールエンドミルの球面刃部と固定位置にある計測器の軸
方向と直角に変位可能に支持された測定子先端に中心で
取付けられた測定円板とが互いの軸を直交する状態で該
測定円板の外周で接触するようにボールエンドミルを測
定位置に位置決めし、該測定位置における球面刃部中心
の座標と未接触状態の測定円板中心の座標とより求まる
前記球面刃部中心と未接触状態の測定円板中心との距離
（Ｒ）と、接触時に計測器より検出される測定円板の変
位量εと、予め求められている測定円板の半径γ′とに
よりボールエンドミルと測定円板との接点におけるボー
ルエンドミルの工具半径（γ）を算出し、この算出をボ
ールエンドミルの表面上の各点において行うようになし
たことを特徴とするボールエンドミルの真球度測定方
法。1. In an NC machine tool, a measurement mounted at the tip of a contact point which is supported so as to be displaceable at right angles to the axial direction of a spherical blade portion of a ball end mill mounted on a spindle and a measuring instrument at a fixed position. The ball end mill is positioned at the measurement position so that the disc and the disc are in contact with each other on the outer circumference of the measurement disc in a state where their axes are orthogonal to each other, and the measurement disc in the non-contact state with the coordinates of the spherical blade center at the measurement position. The distance (R) between the center of the spherical blade portion and the center of the measurement disc in the non-contact state, which is obtained from the coordinates of the center, and the displacement ε of the measurement disc detected by the measuring instrument at the time of contact, are obtained in advance. The tool radius (γ) of the ball end mill at the contact point between the ball end mill and the measurement disc is calculated from the radius γ ′ of the measurement disc, and this calculation is performed at each point on the surface of the ball end mill. Characterizing Sphericity measuring method Lumpur end mill.
部を測定円板に接触させるものである請求項１に記載の
ボールエンドミルの真球度測定方法。2. The method for measuring the sphericity of a ball end mill according to claim 1, wherein the spherical blade portion is brought into contact with the measuring disk while rotating the ball end mill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1103052A JPH0765896B2 (en) | 1989-04-21 | 1989-04-21 | How to measure the sphericity of a ball end mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1103052A JPH0765896B2 (en) | 1989-04-21 | 1989-04-21 | How to measure the sphericity of a ball end mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02281102A JPH02281102A (en) | 1990-11-16 |
| JPH0765896B2 true JPH0765896B2 (en) | 1995-07-19 |
Family
ID=14343901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1103052A Expired - Lifetime JPH0765896B2 (en) | 1989-04-21 | 1989-04-21 | How to measure the sphericity of a ball end mill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0765896B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4580048B2 (en) * | 1999-07-22 | 2010-11-10 | 東芝機械株式会社 | Automatic measuring method and automatic measuring apparatus for ball end mill tool |
| JP2003083706A (en) * | 2001-09-14 | 2003-03-19 | Kayaba Ind Co Ltd | Displacement gage for shape measurement |
| JP6264702B2 (en) * | 2014-09-12 | 2018-01-24 | 株式会社Kmc | Processing equipment |
| JP6743115B2 (en) * | 2018-12-14 | 2020-08-19 | Dmg森精機株式会社 | Contact detection device |
| WO2024053571A1 (en) * | 2022-09-09 | 2024-03-14 | Dmg森精機株式会社 | Displacement detection device |
| WO2024053575A1 (en) * | 2022-09-09 | 2024-03-14 | Dmg森精機株式会社 | Displacement detection device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59126203A (en) * | 1983-01-07 | 1984-07-20 | Kubota Ltd | Roll distortion measuring apparatus |
-
1989
- 1989-04-21 JP JP1103052A patent/JPH0765896B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02281102A (en) | 1990-11-16 |
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