Ball end mill

A technology of ball end mills and end mills, which is applied in the direction of milling cutters, milling cutting blades, milling machine equipment, etc., can solve difficult cutting processing and other problems, and achieve the effect of preventing chipping and defect and long-term stable cutting processing

Active Publication Date: 2022-07-08
MOLDINO TOOL ENG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the shape and size of the chisel edge are not set in such a shape and size that it i

Method used

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  • Ball end mill
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Examples

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Example Embodiment

[0051] Example

Example Embodiment

[0053] (Example 1, 2)

[0054] Next, an example of the present invention will be given, especially the ratio W / D of the width W (mm) to the diameter D (mm) of the chisel edge portion 10 in the present invention and the distance between the chip flutes 7 (center flutes 8 ) The effect of the ratio L / D of the staggered amount L (mm) to the diameter D (mm) is verified. In this example, the rake angle of the bottom edge 5a within the range where the chisel edge 10a is formed in the chisel edge portion 10 is -20 based on the above-described embodiment, the diameter D (mm) of the bottom edge 5a is 0.6 mm ° ball nose end mill, making a ball nose end mill with a ratio W / D of 0.023 and a ratio L / D of 0.075, and a ball nose end mill with a ratio W / D of 0.045 and a ratio L / D of 0.077 . These ball end mills were set as Examples 1 and 2 in this order.

Example Embodiment

[0055] (Examples 3 and 4)

[0056] In addition, for the ball nose end mill in which the diameter D (mm) of the bottom edge 5a is 0.6 mm based on the above-described embodiment, the leading edge of the bottom edge 5a within the range where the chisel edge 10a is formed in the chisel edge portion 10 is manufactured. The rake angle of the ball nose end mill with an angle of -25°, a ratio W / D of 0.040, and a ratio L / D of 0.052, and the bottom edge 5a within the range where the chisel edge 10a is formed in the chisel edge portion 10 is - 15° ball nose end mill with ratio W / D of 0.040 and ratio L / D of 0.052. These ball end mills were used as Examples 3 and 4 in this order. In addition, in the ball nose end mills of these Examples 1 to 4, the relief angle of the first flanking surface portion 6a was 6°, and the relief angle of the second flanking surface portion 6b was 14°.

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Abstract

An end mill is provided with: an end mill main body having a convex hemispherical end cutting edge (5a); and a hard coating film covering at least the surface of the tip of the end mill main body (1). The end cutting edge (5a) has a diameter D (mm) of 2 mm or less. The ratio W/D of the width W (mm) to the diameter D (mm) of the chisel edge part (10) is within the range of 0.020-0.060. The ratio L/D of the offset amount L (mm) to the diameter D (mm) between the chip grooves (7) is within the range of 0.014-0.090. The rake angle of the end cutting edge (5a) within the range in which the chisel edge (10a) is formed in the chisel edge part (10) is within the range of-15 DEG to-30 DEG.

Description

technical field [0001] The present invention relates to a ball nose end mill. [0002] An embodiment of the present invention relates to a ball end mill in which an end mill is rotationally symmetrical with respect to the axis on the outer periphery of the front end portion of the end mill main body that rotates in the direction of rotation of the end mill around the axis. Two chip flutes that open on the front flank of the milling cutter body and extend to the rear end side, at the intersection of the wall surface of these flutes facing the direction of rotation of the end mill and the front flank surface of the end mill main body On the wire portion, a convex hemispherical cutting edge having a center on the axis of the rotation locus around the axis is formed. [0003] This application claims priority based on Japanese Patent Application No. 2020-002442 filed in Japan on January 9, 2020, the contents of which are incorporated herein by reference. Background technique ...

Claims

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Application Information

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IPC IPC(8): B23C5/10
CPCB23C5/1009B23C2210/54B23C2228/10B23C2210/0421B23C2220/64B23C2200/32
Inventor 居原田有辉
Owner MOLDINO TOOL ENG LTD
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