JPS59102510A - Ball end mill tool - Google Patents
Ball end mill toolInfo
- Publication number
- JPS59102510A JPS59102510A JP21025382A JP21025382A JPS59102510A JP S59102510 A JPS59102510 A JP S59102510A JP 21025382 A JP21025382 A JP 21025382A JP 21025382 A JP21025382 A JP 21025382A JP S59102510 A JPS59102510 A JP S59102510A
- Authority
- JP
- Japan
- Prior art keywords
- tool
- center
- surface roughness
- end mill
- ball end
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/02—Milling-cutters characterised by the shape of the cutter
- B23C5/10—Shank-type cutters, i.e. with an integral shaft
- B23C5/1009—Ball nose end mills
- B23C5/1018—Ball nose end mills with permanently fixed cutting inserts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling Processes (AREA)
Abstract
Description
【発明の詳細な説明】 この発明はボールエンドミル工具に関するものである。[Detailed description of the invention] This invention relates to a ball end mill tool.
表面加工の代表的様式であるピックフィード切削は、第
1図に示すように、X軸方向にボールエンドミル工具1
を送り、それをy軸方向にピッチPKて繰返す切削方法
であって、これによって形成される被切削物2表面の表
面粗度h(波形状の凹凸差)は2軸方向の高さで表わす
ことができる。Pick feed cutting, which is a typical method of surface machining, is carried out using a ball end mill tool 1 in the X-axis direction, as shown in Fig. 1.
This is a cutting method in which the wafer is fed and repeated at a pitch PK in the y-axis direction, and the surface roughness h (difference in unevenness of the waveform) of the surface of the workpiece 2 formed by this is expressed by the height in the two-axis direction. be able to.
従来のボールエンドミル工具1は、第2図(A)および
(6)に示すように、回転軸部3の先端の・球状部4(
半径r)に2枚の刃5.6を設けたものであり、球状部
4は回転軸部3の軸心3aに中心Oを有する。As shown in FIGS. 2(A) and (6), the conventional ball end mill tool 1 has a spherical portion 4 (
Two blades 5.6 are provided at a radius r), and the spherical portion 4 has a center O at the axis 3a of the rotating shaft portion 3.
かかる従来のボールエンドミル工具1を用いピックフィ
ード切削において良好な表面粗度りを得るには、第3図
に示すように、半径rを犬きくするか、ピッチPを小さ
くしなければならない。第3図において、表面粗度h□
は次式で示される。In order to obtain good surface roughness in pick-feed cutting using such a conventional ball end mill tool 1, the radius r must be increased or the pitch P must be decreased, as shown in FIG. In Figure 3, the surface roughness h□
is expressed by the following equation.
しかしながら、半径rを大きくすればするほど、工具の
コストが高くなり、また地平面(例えば第1図に示すy
z、zx面)に被切削物2が隣接している場合、その面
への干渉(不用意なahみ)を起こしやすくなる。また
、ピッチPを小さくすればするほど、加工時間が長くな
り、工具寿命も短かくなるという問題があった。However, the larger the radius r, the higher the cost of the tool, and the higher the
When the workpiece 2 is adjacent to the surface (z, zx plane), interference with that plane (inadvertent ah) is likely to occur. Further, there was a problem that the smaller the pitch P, the longer the machining time and the shorter the tool life.
したがって、この発明の目的は、ピックフィード切削に
おける被切削物の表面粗度を良好なものにするボールエ
ンドミル工具を提供することであこの発明の概要を第4
図および第5図に基づいて説明する。すなわち、このボ
ールエンドミル工具は、第4図(A)およびCB)に示
すように、球状部100頭頂部から外側面にわたって設
けた刃7,8が前記頭頂部においてフラット9であり、
かつ球状部10の中心0に対して回転軸部110回転中
心11aを偏心させたものである。Therefore, an object of the present invention is to provide a ball end mill tool that improves the surface roughness of a workpiece in pick feed cutting.
This will be explained based on the figure and FIG. That is, in this ball end mill tool, as shown in FIGS. 4(A) and CB), the blades 7 and 8 provided from the top of the spherical part 100 to the outer surface are flat 9 at the top of the head,
In addition, the rotation center 11a of the rotating shaft portion 110 is eccentric with respect to the center 0 of the spherical portion 10.
第4図色)および@)において、lはフラット9面から
もとの球状体の最下点までの距離であり、またαは回転
軸部11の回転中心11aからこの回転中心11aに平
行で球状部10の中心0を通る軸10aとの距離、すな
わち偏心距離を示している。In Fig. 4 (color) and @), l is the distance from the flat 9 surface to the lowest point of the original spherical body, and α is the distance from the rotation center 11a of the rotating shaft portion 11 parallel to this rotation center 11a. The distance from the axis 10a passing through the center 0 of the spherical portion 10, that is, the eccentric distance is shown.
このように、刃先形状をフラットにし、かつ回転軸部1
1の回転中心11aが偏心することにより、第5図に示
すようにしてピックフィード切削を行なう場合、その表
面粗度h2は次式で示される。In this way, the shape of the cutting edge is made flat, and the rotating shaft part 1
When pick-feed cutting is performed as shown in FIG. 5 due to eccentricity of the rotation center 11a of No. 1, the surface roughness h2 is expressed by the following equation.
一般に、刃先をフラットにし、回転軸部11を偏心させ
れば、工具寿命は短かくなるが、フラット単独の場合で
l!= 0.041111未満、偏心単独の場合でα=
0.311’1未満なら、またフラットと偏心との複
合の場合で/ = 0.03 fi 、 (t = 0
.2 tl1未満なら、工具寿命にはほとんど影響がな
い。また、後述の実施例からも明らかなように、刃先を
フラットにし、かつ回転軸11に偏心を与えるだけで、
従来の工具に比してはるかに良好な表面粗度を得ること
ができるのである。しかも、この発明によ九ば、同じ表
面粗度を得る場合にも、従来に比して工具径が小さくて
よく、安価に製造できるとともに、加工時間も大幅に短
縮できるのである。Generally, if the cutting edge is made flat and the rotating shaft portion 11 is made eccentric, the tool life will be shortened, but if the cutting edge is made flat alone, the tool life will be shortened. = less than 0.041111, α= in case of eccentricity alone
If it is less than 0.311'1, and in the case of a combination of flat and eccentric, / = 0.03 fi, (t = 0
.. If it is less than 2 tl1, there is almost no effect on tool life. Furthermore, as is clear from the examples described below, by simply making the cutting edge flat and giving eccentricity to the rotating shaft 11,
Much better surface roughness can be obtained than with conventional tools. Moreover, according to the present invention, even when obtaining the same surface roughness, the tool diameter may be smaller than that of the conventional tool, and it can be manufactured at low cost and the machining time can be significantly shortened.
つぎに、実施例をあげてこの発明のポールエンドミル工
具を説明する。Next, the pole end mill tool of the present invention will be explained with reference to examples.
実施例: 第5図に示す工具各部の寸法が以下のとおり
であるボールエンドミル工具を用いて、強化木表面の切
削を行なった。Example: A reinforced wood surface was cut using a ball end mill tool shown in FIG. 5 whose dimensions of each part were as follows.
半 径: r=10M
ピッチ: P=2ff
フラット面: 7?=o、oam
偏心距離:α= 0.2 ff
切削条件は1刃当りの送りを0.0251111とした
。Radius: r=10M Pitch: P=2ff Flat surface: 7? = o, oam Eccentric distance: α = 0.2 ff The cutting conditions were a feed per tooth of 0.0251111.
切削後、表面粗度h2を測定した結果、h2=2.1μ
であった。As a result of measuring the surface roughness h2 after cutting, h2=2.1μ
Met.
比較例1: 刃先が完全な球状でかつ回転中心も便心し
ていないほかは、実施例と同寸法の工具を用いて実施例
と同条件で切削を行なったところ、表面粗度は50.1
μであった。Comparative Example 1: Cutting was performed under the same conditions as in the example using a tool with the same dimensions as in the example, except that the cutting edge was perfectly spherical and the center of rotation was not concentric, and the surface roughness was 50.1.
It was μ.
比較例2: 第6図に示すように、刃先がわずかにフラ
ットで回転中心が偏心していないほかは実施例と同寸法
の工具を用いて実施例と同条件で切削を行なったところ
、表面粗度は6.8μであった。Comparative Example 2: As shown in Figure 6, cutting was performed under the same conditions as in the example using a tool with the same dimensions as in the example except that the cutting edge was slightly flat and the center of rotation was not eccentric. The degree was 6.8μ.
一方、第6図に示す工具を用いた理論表面粗度h3は7
.2μであり、実測値(6,8μ)とかなり近似してい
た。理論表面粗度h3は次式により求めた(ただし、a
= 1.85卵とする)。On the other hand, the theoretical surface roughness h3 using the tool shown in Fig. 6 is 7.
.. 2μ, which was quite close to the actual measured value (6,8μ). Theoretical surface roughness h3 was determined by the following formula (however, a
= 1.85 eggs).
比較例3: 回転中心が偏心しく偏心距離0.3m)、
刃先が球状であるほかは実施例と同寸法の工具を用いて
実施例と同条件で切削を行なったところ、表面粗度は1
8.5μであった。この場合、刃は回転によって円形で
はなく楕円形となるので、それだけ表面粗度の向上に寄
与するものと考えられるが、理論表面粗度h4を次式か
ら求めると、245μであった0
実測値と理論値との差(約6μ)は、供試工具の刃先が
投影機では判別できないほどごくわずかにフラットにな
っていたためと推測される。Comparative example 3: The center of rotation is eccentric and the eccentric distance is 0.3 m),
When cutting was performed under the same conditions as in the example using a tool with the same dimensions as in the example except that the cutting edge was spherical, the surface roughness was 1.
It was 8.5μ. In this case, since the blade becomes elliptical rather than circular due to rotation, it is thought that this contributes to improving the surface roughness, but when the theoretical surface roughness h4 is calculated from the following formula, it is 245μ. The difference between this and the theoretical value (approximately 6μ) is presumed to be because the cutting edge of the test tool was so slightly flat that it could not be discerned using a projector.
これらの試験結果から明らかなように、刃先をフラット
にしかつ回転軸の回転中心を偏心させた実施例の工具は
第3図に示すような従来の工具(比較例1)に比して表
面粗度で約24倍の好結果が得られた。この好結果は、
単に刃先をフラットにした工具(比較例2)や回転中心
を偏心させた工具(比較例3)によって得られる結果よ
りもはるかにすぐれているところから、これらの相乗作
用によるものと考えられるのである。As is clear from these test results, the tool of the example with a flat cutting edge and eccentric center of rotation of the rotating shaft has a surface roughness compared to the conventional tool (comparative example 1) as shown in Fig. 3. Approximately 24 times better results were obtained. This good result is
This is thought to be due to a synergistic effect, as the results are far superior to those obtained with a tool with a flat cutting edge (Comparative Example 2) or a tool with an eccentric center of rotation (Comparative Example 3). .
また、比較例1におけるような従来の工具にて、実施例
における工具と同じ表面粗度を得るためには、工具径を
238 tg (23a倍)にする必要があり、実際上
このような工具を入手するのは困難であり、また膨大な
費用がかかる。また、ピッチを変える場合はピッチが0
.4 fl (115倍)となり、加工時間で5倍も必
要となる。In addition, in order to obtain the same surface roughness as the tool in the example with a conventional tool such as in Comparative Example 1, the tool diameter must be increased to 238 tg (23a times), and in practice such a tool is difficult to obtain and also costs a great deal of money. Also, when changing the pitch, the pitch is 0.
.. 4 fl (115 times), and 5 times the processing time is required.
以上のように、この発明のボールエンドミル工具は、回
転軸部先端の球状部にその頭頂部から外側面にわたって
刃を設けるとともに、この刃が前記頭頂部においてフラ
ットであり、かつ前記回転軸部の回転中心が球状部の中
心から偏心していることにより、ビックフィード切削に
おける被切削物の表面粗度を良好なものにすることがで
きるという効果がある。As described above, in the ball end mill tool of the present invention, the spherical portion at the tip of the rotating shaft portion is provided with a blade extending from the top of the head to the outer surface, and the blade is flat at the top of the head, and the blade is flat at the top of the head, and Since the center of rotation is eccentric from the center of the spherical part, there is an effect that the surface roughness of the workpiece can be made good in big feed cutting.
第1図はビックフィード切削方法の説明図、第2図(A
)および(B)は従来のボールエンドミル工具の正面図
および平面図、第3図はその切削状態の説明図、第4図
(A)およびの)はこの発明のボールエンドミル工具の
一例を示す正面図および平面図、第5図はその切削状態
の説明図、第6図は比較例2で用いた工具の切削状態を
示す説明図である。
9・・・フラット、10・・・球状部、11・・・回転
軸部、11a・・・回転中心
第1図
第 7 k4
.2
第3図
(A) (B)第4図Figure 1 is an explanatory diagram of the big feed cutting method, Figure 2 (A
) and (B) are a front view and a plan view of a conventional ball end mill tool, FIG. 3 is an explanatory diagram of its cutting state, and FIG. 4 (A) and (B) are front views showing an example of the ball end mill tool of the present invention. FIG. 5 is an explanatory diagram of the cutting state thereof, and FIG. 6 is an explanatory diagram showing the cutting state of the tool used in Comparative Example 2. 9...Flat, 10...Spherical part, 11...Rotating shaft part, 11a...Rotation center Fig. 1 Fig. 7 k4. 2 Figure 3 (A) (B) Figure 4
Claims (1)
て刃を設けるとともに、この刃が前記頭頂部においてフ
ラットであシ、かつ前記回転軸部の回転中心が球状部の
中心から偏心していることを特徴とするボールエンドミ
ル工具。A spherical part at the tip of the rotating shaft is provided with a blade extending from the top of the head to the outer surface thereof, and the blade is flat at the top of the head, and the center of rotation of the rotating shaft is eccentric from the center of the spherical part. A ball end mill tool featuring:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21025382A JPS59102510A (en) | 1982-11-30 | 1982-11-30 | Ball end mill tool |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21025382A JPS59102510A (en) | 1982-11-30 | 1982-11-30 | Ball end mill tool |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS59102510A true JPS59102510A (en) | 1984-06-13 |
Family
ID=16586315
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21025382A Pending JPS59102510A (en) | 1982-11-30 | 1982-11-30 | Ball end mill tool |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59102510A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4968195A (en) * | 1986-01-28 | 1990-11-06 | Kabushiki Kaisha Toyota Chuo Kenkyosho | Method and tool for machining a three dimensional surface |
FR2704792A1 (en) * | 1993-05-03 | 1994-11-10 | Belin Sa Yvon | High speed finishing cutter. |
US7281883B2 (en) | 2002-10-25 | 2007-10-16 | Ns Tool Co., Ltd. | Ball end mill |
JP2008246590A (en) * | 2007-03-29 | 2008-10-16 | Sugino Mach Ltd | Burnishing tool for flat surface and burnishing method |
-
1982
- 1982-11-30 JP JP21025382A patent/JPS59102510A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4968195A (en) * | 1986-01-28 | 1990-11-06 | Kabushiki Kaisha Toyota Chuo Kenkyosho | Method and tool for machining a three dimensional surface |
FR2704792A1 (en) * | 1993-05-03 | 1994-11-10 | Belin Sa Yvon | High speed finishing cutter. |
EP0625398A1 (en) * | 1993-05-03 | 1994-11-23 | Yvon Belin S.A. | Precision milling cutter for high speed |
US7281883B2 (en) | 2002-10-25 | 2007-10-16 | Ns Tool Co., Ltd. | Ball end mill |
JP2008246590A (en) * | 2007-03-29 | 2008-10-16 | Sugino Mach Ltd | Burnishing tool for flat surface and burnishing method |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPH06509518A (en) | Drill tools and cutting inserts for drilling holes in solid materials | |
CA2348287C (en) | Spherical cutting tool | |
CN105772809A (en) | Drill stem and tool bit of drill bit and manufacturing method of drill bit | |
JPS59102510A (en) | Ball end mill tool | |
JPH11156621A (en) | Circular arc end mill | |
JPS59175915A (en) | End mill | |
JPH11156620A (en) | Circular arc blade end mill | |
JPH05500479A (en) | Hob for face gear manufacturing | |
JPS63288615A (en) | Drill | |
JPH031137Y2 (en) | ||
JPH11156623A (en) | Spherical blade end mill | |
JPS6231215Y2 (en) | ||
JPS6445504A (en) | Hole cutting tool | |
JPH04101708A (en) | Drill | |
JPH02303707A (en) | Ball end mill | |
JPH01204705A (en) | Drill | |
JPH0112893Y2 (en) | ||
JP2001198718A (en) | Curved surface cutting method | |
CN214396186U (en) | Rotary cutting tool | |
JP2004090168A (en) | Cutting tool and its second angle forming method | |
JPS6221361Y2 (en) | ||
JPS63278708A (en) | Drill | |
JPH0123245B2 (en) | ||
JPS6212504Y2 (en) | ||
JPH0929594A (en) | Drill grinding wheel and method of grinding drill blade |