JPH0239811U

JPH0239811U -

Info

Publication number: JPH0239811U
Application number: JP11799388U
Authority: JP
Priority date: 1988-09-07
Filing date: 1988-09-07
Publication date: 1990-03-16

Description

[Brief explanation of drawings]

第１図は本考案の一実施例であるボールエンド
ミルを示す正面図（一部断面）である。第２図は
上記ボールエンドミルのチツプ保持部の側面断面
図であり、第３図は側面図である。第４図ａは上
記ボールエンドミルに取り付けられる円筒チツプ
の拡大側面図、第４図ｂは同じく正面図（一部断
面）である。第５図ａ，ｂ，ｃないし第７図ａ，
ｂ，ｃは、上記ボールエンドミルの扇形チツプお
よび円筒チツプの取付位置を示す説明図である。
第８図は第５図における―断面図である。第
９図は円筒チツプと各扇形チツプとの相対位置関
係を示す説明図である。第１０図は円筒チツプの
一配置例を示す図であり、第１１図は別の配置例
を示す図である。第１２図ａ，ｂおよび第１３図
ａ，ｂは、それぞれ扇形チツプの配置を説明する
ための図である。第１４図は見掛けのすくい角と
真のすくい角との関係を示す図である。１０：取付部、１２：チツプ保持部、１４：円
筒チツプ、１６，１８，２０：扇形チツプ、２８
，４４，４８，５０：切刃。 FIG. 1 is a front view (partially in section) showing a ball end mill that is an embodiment of the present invention. FIG. 2 is a side sectional view of the tip holding portion of the ball end mill, and FIG. 3 is a side view. FIG. 4a is an enlarged side view of the cylindrical tip attached to the ball end mill, and FIG. 4b is a front view (partially in section) of the same. Figure 5 a, b, c to Figure 7 a,
b and c are explanatory diagrams showing the mounting positions of the fan-shaped tip and the cylindrical tip of the ball end mill.
FIG. 8 is a cross-sectional view of FIG. 5. FIG. 9 is an explanatory diagram showing the relative positional relationship between the cylindrical chip and each fan-shaped chip. FIG. 10 is a diagram showing one example of the arrangement of the cylindrical chips, and FIG. 11 is a diagram showing another example of the arrangement. FIGS. 12a and 12b and FIGS. 13a and 13b are diagrams for explaining the arrangement of the fan-shaped tips, respectively. FIG. 14 is a diagram showing the relationship between the apparent rake angle and the true rake angle. 10: Mounting part, 12: Chip holding part, 14: Cylindrical chip, 16, 18, 20: Fan-shaped chip, 28
, 44, 48, 50: Cutting blade.

Claims

[Claims for Utility Model Registration] A shaft-shaped main body that is attached to the main shaft of a machine tool at one end of the mounting part, and a chip holding part provided at the opposite end of the main body to the mounting part. In the ball end mill, the cutting tip is a combination of a cylindrical tip and a fan-shaped tip, and at least one cylindrical tip is attached to the tip of the tip holding part so that the end face of the cylindrical tip is attached to the tip of the tip holding part. The tip was installed at a small angle with respect to the plane perpendicular to the axis of the main body, and the relative positions of the cylindrical tip and the fan-shaped tip were determined so that the rotational trajectories of their cutting blades jointly formed a spherical surface. A ball end mill characterized by: