JPS6374213U

JPS6374213U -

Info

Publication number: JPS6374213U
Application number: JP16943786U
Authority: JP
Priority date: 1986-11-04
Filing date: 1986-11-04
Publication date: 1988-05-18
Also published as: JPH023375Y2

Description

[Brief explanation of drawings]

第１図は本考案に基づく底切刃が設けられたボ
ールエンドミルの側面図である。第２図は第１図
の底面図である。第３図は従来例の底切刃をもつ
ボールエンドミルの底面図である。１……ボールエンドミル、２……シヤンク、３
……ボールエンドミル本体、４……先端部、５…
…底切刃用チツプポケツト、６……周切刃用チツ
プポケツト、７……底切刃用チツプ、８……周切
刃用チツプ、９……底切刃、９ａ……始端、９ｂ
……終端、１０……周切刃、１０ａ……始端、１
０ｂ……終端、Ｄ……ボールエンドミル本体の直
径、Ｒ……底切刃の曲率半径、Ｌｅ……底切刃の
終端間の距離、Ｌｒ……周切刃の始端間の距離、
Ｌｏ……回転軌跡上に於ける底切刃終端部と周切
刃始端部との放射方向のオーバラツプ。 FIG. 1 is a side view of a ball end mill provided with a bottom cutting blade according to the present invention. FIG. 2 is a bottom view of FIG. 1. FIG. 3 is a bottom view of a conventional ball end mill with a bottom cutting blade. 1...Ball end mill, 2...Shank, 3
... Ball end mill body, 4 ... Tip part, 5 ...
...Tip pocket for bottom cutting blade, 6...Tip pocket for circumferential cutting blade, 7...Tip for bottom cutting blade, 8...Tip for circumferential cutting blade, 9...Bottom cutting blade, 9a...Starting end, 9b
...Ending end, 10...Peripheral cutting edge, 10a...Starting end, 1
0b...Terminal end, D...Diameter of the ball end mill body, R...Curvature radius of the bottom cutting blade, Le...Distance between the terminal ends of the bottom cutting blade, Lr...Distance between the starting ends of the peripheral cutting blade,
Lo: Overlap in the radial direction between the end of the bottom cutting blade and the starting end of the peripheral cutting blade on the rotation locus.

Claims

[Claims for Utility Model Registration] (1) A ball end mill in which a bottom cutting blade is provided at the tip of the ball end mill body, and a circumferential cutting blade is provided from the outer periphery of the main body to the tip; is formed in an arc shape convex in the rotational direction with a radius of curvature that can cut the workpiece while making point contact with the workpiece, and the radius of curvature extends over the entire length from the starting end to the end of the bottom cutting edge. An angle that is approximately constant and in which any one of the angles formed by the bottom cutting blades, the angles formed by the circumferential cutting blades, or the angles formed by the bottom cutting blade and the circumferential cutting blade is not equally divided. Further, the bottom cutting edge is made of M30, which is a tough cemented carbide among the cemented carbide for general cutting tools, and the peripheral cutting edge is made of M30, which is a tough cemented carbide for general cutting tools. A ball end mill characterized in that it is made of M20, which is a hard metal. (2) The ball end mill according to claim (1) of the utility model registration claim, wherein the starting end and the ending end of the bottom cutting edge formed in an arc shape are on the same radiation from the shaft center. . (3) Utility model registration claim No. (1) characterized in that the cutting edge in the rotational direction of the bottom cutting blade formed in an arc shape is located in the vicinity of 1/2 circle of the diameter of the ball end mill body. or the ball end mill described in paragraph (2). (4) Utility model registration claim No. 1, characterized in that the radius of curvature of the bottom cutting blade is approximately 1/4 to 3/4 of the diameter of the ball end mill main body when viewed from the bottom.
The ball end mill according to any one of items ) to item (3). (5) Any one of claims (1) to (4) for a utility model registration, characterized in that a bottom cutting tip having a bottom cutting edge is fixed to the ball end mill body with brazing. Ball end mill as described. (6) The ball end mill according to any one of claims (1) to (5), wherein the bottom cutting blade is of a two-blade type. (7) The ball end mill according to claim (1) of the utility model registration, characterized in that the angles formed by the bottom cutting blades are divided by angles that are not equally divided. (8) The ball end mill according to claim (1) of the utility model registration, characterized in that the angles formed by the circumferential cutting blades are divided by angles that are not equally divided. (9) The ball end mill according to claim (1) of the utility model registration, characterized in that the angle formed by the bottom cutting edge and the peripheral cutting edge is divided by angles that are not equally divided. (10) According to the scope of the utility model registration claim (1), which is characterized in that the angle formed by each bottom cutting edge and the angle formed by each peripheral cutting edge are divided by angles that are not equally divided. Ball end mill as described. 〓(11)１１〓 The circumferential cutting edge is separated from the bottom cutting edge in the direction of rotation, and the angle of the circumferential cutting edge in the rotational direction with respect to the bottom cutting edge becomes an angle that is larger than the equal division angle. A ball end mill according to claim (9) of the utility model registration. (12) 12 The ball end mill according to claim (1) of the utility model registration, characterized in that the distance between the ends of the bottom cutting blades is approximately 70% to 90% of the diameter of the ball end mill body. . 〓(13)13〓 Utility model registration claim item (1) or 〓(11) characterized in that the distance between the starting ends of the peripheral cutting blades is approximately 60% to 80% of the diameter of the ball end mill body. )11〓The ball end mill described in item 11〓. 〓(14)１４〓 The terminal end of the bottom cutting blade and the starting end of the peripheral cutting blade overlap in the radial direction by about 5% to 20% of the diameter of the ball end mill body on the rotation locus. A ball end mill according to any one of claims (1) to (3) of the utility model registration claims.