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End Mill

An end mill and shank technology, applied in milling cutters, milling machine equipment, metal processing equipment, etc., can solve problems such as defects and interface cracks, improve tolerance, prevent stress concentration, and achieve long life. Effect

Active Publication Date: 2014-12-31
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when only cemented carbide is used, an end mill formed as in Patent Document 1 or Patent Document 2 is effective; , the stress concentration in the direction perpendicular to the axis tends to occur at the boundary surface of each component, so there is a problem of defects due to cracks caused by the boundary surface

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0046] With regard to the end mill according to the present invention described above, experiments were conducted to confirm the effects.

[0047] As each sample of the end mill, a radius end mill with a tip radius of 0.05 mm was formed, and the shape of each sample was formed under the conditions shown in Table 1. The samples of Examples 1 to 4 and Comparative Example 1 were formed so that the shapes of the cutting edge portion, the shank portion, etc. were the same except for the shape of the neck portion. In addition, the sample of Comparative Example 2 was formed such that the cutting edge portion had a blade diameter D of 0.1 mm, which was smaller in diameter than the other samples.

[0048] The "shape of the boundary surface part" in Table 1 shows what shape the boundary surface part between the tool front end part and the tool base end part of each sample is. For example, in Example 1, a part of the concave surface forming the thinnest part is provided with a boundary ...

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Abstract

The present invention provides an end mill which can prevent a boundary surface at a cutting blade part and a knife handle from being folded and damaged, and is long in service life. The end mill of the present invention comprises a tool front end part having the cutting blade part of which the blade diameter is less than 0.5 mm, and a tool base end part having the knife handle part. The tool front end part is made of a material of which the Young modulus is greater than the tool base end part, wherein a neck part which is formed by a continuous curve surface and of which the diameter is less than the knife handle is formed between the cutting blade part and the knife handle part, and the boundary surface of the tool front end part and the tool base end part formed at the neck part is configured at the position from the tool nose front end of the cutting blade part and within the range of 1-3 times of the blade diameter. The diameter of the thinnest part of the neck part is set as 0.8-0.95 times of the blade diameter, and the thinnest part is configured at the position within the range of 0.1-1 times of the blade diameter from the boundary surface to the tool nose front end.

Description

technical field [0001] The present invention relates to a small-diameter end mill used for machining precision molds and the like. Background technique [0002] The end mill has a cutting edge portion and a shank portion composed of a peripheral cutting edge formed on the outer peripheral portion and a bottom cutting edge formed on the front end. [0003] In addition, in a small-diameter end mill, in order to effectively use the side edge, the diameter of the cutting edge portion is set to be smaller than the diameter of the shank portion, and the distance between the cutting edge portion and the shank portion is passed through a straight or tapered neck. department to connect. However, at the inflection point of such a shape with an increased outer diameter, stress concentration or deflection tends to occur during cutting, and there is a problem that the cutting edge portion and the neck portion are easily broken from the boundary surface of the connecting portion. [000...

Claims

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Application Information

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IPC IPC(8): B23C5/10
Inventor 日向野哲高桥正训久保拓矢
Owner MITSUBISHI MATERIALS CORP
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