Method of setting heat-resistant alloy cutting conditions and method of cutting heat-resistant alloy

Patent metadata

Field	Value
Publication number	US-11925992-B2
Application number	US-202017106852-A
Country	US
Kind code	B2
Filing date	Nov 30, 2020
Priority date	Sep 2, 2016
Publication date	Mar 12, 2024
Grant date	Mar 12, 2024

Abstract

In a method of setting heat-resistant alloy cutting conditions used to set cutting conditions under which a heat-resistant alloy is cut with a cutting tool, the cutting tool has a long shaft mounted on a spindle and extended in the axial direction and teeth formed on the shaft. The cutting conditions include a radial direction cutting amount of the cutting tool in the radial direction. When the radial direction cutting amount in which one tooth is constantly in contact with the heat-resistant alloy is given as a smallest radial direction cutting amount and the radial direction cutting amount in which three or more teeth are not in contact with the heat-resistant alloy is given as a largest radial direction cutting amount, a radial direction cutting amount of the cutting tool is set in the range from the smallest radial direction cutting amount to the largest radial direction cutting amount.

First claim

The invention claimed is:

1. A method of setting a heat-resistant alloy cutting condition that is used to set a cutting condition under which a heat-resistant alloy is cut with a cutting tool mounted on a spindle, the cutting tool being an end mill including a shaft mounted on the spindle and extended in an axial direction and a plurality of teeth disposed on an outer circumference of the shaft, and
the cutting condition includes a radial direction cutting amount in a radial direction of the cutting tool, the method comprising
when the radial direction cutting amount in which one of the teeth is constantly in contact with the heat-resistant alloy is given as a smallest radial direction cutting amount, and
the radial direction cutting amount in which three or more teeth of the teeth are not in contact with the heat-resistant alloy is given as a largest radial direction cutting amount,
setting the radial direction cutting amount of the cutting tool in a range from the smallest radial direction cutting amount to the largest radial direction cutting amount, wherein
when a when a length of projection of the cutting tool from the spindle is given as L, a tool diameter of the cutting tool is given as D, and the number of teeth of the cutting tool is given as N,
the cutting condition includes conditions that (L/D)×N is from 40 to 120 for L/D being 3.5 to 5, and (L/D)×N is equal to or greater than 90 for L/D being larger than 5.

2. The method of setting a heat-resistant alloy cutting condition according to claim 1 , wherein the cutting condition includes a condition under which the cutting tool cuts the heat-resistant alloy at a constant radial direction cutting amount.

3. The method of setting a heat-resistant alloy cutting condition according to claim 1 , wherein
a stable rotational speed of the spindle is calculated using a certain formula based on a parameter including an eigenfrequency of the cutting tool,
a cutting speed of the cutting tool is calculated using a certain formula based on a parameter including the calculated stable rotational speed, and
when the calculated cutting speed is given as Vcn [m/min],
the cutting condition includes a condition under which the cutting tool fulfilling 100 [m/min]<Vcn [m/min]<300 [m/min] is selected.

4. The method of setting a heat-resistant alloy cutting condition according to claim 3 , wherein
a plurality of the stable rotational speeds are calculated,
a plurality of the cutting speeds are calculated based on the stable rotational speeds,
a largest cutting speed of the cutting speeds, fulfilling 100 [m/min]<Vcn [m/min]<300 [m/min] is selected, and
the cutting condition includes a condition under which the stable rotational speed corresponding to the selected cutting speed is set as a spindle rotational speed of the spindle.

5. The method of setting a heat-resistant alloy cutting condition according to claim 1 , wherein
the cutting condition includes a feed rate per tooth of the cutting tool, and
the feed rate per tooth of the cutting tool is set based on a cut cross-sectional area per tooth, given by multiplying a thickness of removal by a width of cutting, and an amount of inclination of the cutting tool with respect to the axial direction.

6. The method of setting a heat-resistant alloy cutting condition according to claim 5 , wherein when at least one of the thickness of removal and the amount of inclination is equal to or greater than a preset threshold, the feed rate per tooth of the cutting tool is reset to be smaller than the feed rate previously set.

7. The method of setting a heat-resistant alloy cutting condition according to claim 1 , further comprising cutting the heat-resistant alloy using the cutting tool.

Assignees

• Mitsubushi Heavy Ind Ltd
• Mitsubishi Heavy Ind Ltd

Inventors

• Eto Jun

Classifications

• B23C5/10 Primary

  Shank-type cutters, i.e. with an integral shaft · CPC title

• B23Q15/00

  Automatic control or regulation of feed movement, cutting velocity or position of tool or work · CPC title

• B23Q15/013

  Control or regulation of feed movement (B23Q15/12 takes precedence) · CPC title

• B23Q15/08

  Control or regulation of cutting velocity (B23Q15/12 takes precedence) · CPC title

• B23C2220/48

  Methods of milling not otherwise provided for · CPC title