Ball end mill

A ball-end milling cutter and ball-end technology, which is applied in the direction of milling cutters, milling machine equipment, metal processing equipment, etc., can solve the problems of different, NC machining programming difficulties, etc., and achieve the effect of preventing clogging and suppressing cutting residue

CN104416207BActive Publication Date: 2018-05-22MITSUBISHI MATERIALS CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-05-22

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Abstract

PROBLEM TO BE SOLVED: To provide a ball end mill capable of cutting in a comparatively large notch amount, and capable of reducing an unshaved part, without disconnecting a tool tip shape from a ball shape.SOLUTION: The ball end mill 1 is formed with a circular arc-shaped ball blade 52 in a ball-shaped part 21 of a tool tip part 2 rotated around the axis (x) by avoiding a tip rotational center part, and is formed with a spherical surface-shaped grinding execution surface 6 having surface roughness of (+) point average roughness of Rz≥10 μm and executing grinding processing to a machinable material by irregularity of its surface, in the tip rotational center part by continuing with a flank 7 of a ball blade 52 without a step difference.
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Description

technical field

[0001] The present invention relates to a small-diameter ball nose end mill used for milling precision molds and the like and a manufacturing method thereof. Background technique

[0002] As an end mill for finishing a three-dimensional curved surface such as a press die, a small ball nose end mill made of a hard material such as sintered diamond (PCD) or cBN sintered body is used. However, depending on the machining conditions, in the grooves machined by the ball end mill, convex shapes due to cutting residues are generated at equal intervals, so there is a problem that a post-processing process is required to obtain a highly smooth machined surface.

[0003] Compared with the feed speed of the ball nose end mill, if the rotation speed (each speed) is relatively slow, the convex shape caused by the cutting residue will be larger, and it will hardly appear on the up-milling side of the machining groove, but on the Climb milling side produces larger. Further...

Examples

Embodiment

[0047] A simulation experiment was carried out to confirm the effect of the ball end mill according to the present invention described above.

[0048] As a model of the simulation experiment, a double-flute ball nose end mill having a tool diameter D (edge ​​diameter of the side cutting edge) of 2.0 mm was set. Furthermore, a simulation experiment of grooving a workpiece was performed for various models in which the height Gh of the grinding surface was changed to 0 mm, 0.01 mm, and 0.03 mm. In addition, the material to be cut is an ideal material that can transfer the trajectory of the cutting edge without generating burrs or cracks. In addition, the ball end mill in which the height Gh of the surface to be ground is 0 mm shows a form that does not have a surface to be ground.

[0049] In addition, the depth of cut ap was 0.1 mm, the rotational speed was 10000 rpm, and the feed rate of the table (the feed rate of the material to be cut) was 4000 mm / min. In addition, these n...