US-12617031-B2 - Cutting tool and cutting processing device

US12617031B2US 12617031 B2US12617031 B2US 12617031B2US-12617031-B2

Abstract

A cutting tool is rotatable about an axis line, and includes a main body portion, a cutting insert, and a plurality of anti-vibration members. The main body portion has an inner circumferential surface and an outer circumferential surface opposite to the inner circumferential surface. The cutting insert is attached to at least one of the inner circumferential surface and the outer circumferential surface. Each of the plurality of anti-vibration members is provided at the main body portion. Each of the plurality of anti-vibration members includes a weight member composed of a material having a specific gravity larger than a specific gravity of a material of the main body portion.

Inventors

Hirochika Fukuda
Takuya Nishimura
Masanori KAKUI
Manabu Tsujino
Tatsuya Ogata

Assignees

SUMITOMO ELECTRIC HARDMETAL CORP.
KOMATSU NTC LTD.
BIG DAISHOWA SEIKI CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20210708
Priority Date: 20200818

Claims (6)

1 . A cutting tool rotatable about an axis line, the cutting tool comprising: a main body having an inner circumferential surface and an outer circumferential surface opposite to the inner circumferential surface; a cutting insert attached to one of the inner circumferential surface and the outer circumferential surface; and a plurality of anti-vibration members provided at the main body, wherein each of the plurality of anti-vibration members includes a weight member composed of a material having a specific gravity larger than a specific gravity of a material of the main body, the main body is provided with a plurality of hollow portions each defined by a respective inner wall surface, each weight member is disposed in a respective hollow portion of the plurality of hollow portions with each weight member being separated from the respective inner wall surface, each weight member is provided with a through hole, each of the plurality of anti-vibration members includes a pin member that extends through the through hole and that is directly attached to the respective inner wall surface, and at least one elastic member that surrounds the pin member and that is in contact with each weight member in the through hole, and a longitudinal direction of the pin member is a radial direction of the main body.
2 . The cutting tool according to claim 1 , wherein in a view parallel with the axis line, each of the plurality of anti-vibration members is disposed on an imaginary circle centered on the axis line.
3 . The cutting tool according to claim 2 , wherein in the view parallel with the axis line, the plurality of anti-vibration members are disposed at equal intervals in a circumferential direction of the imaginary circle.
4 . The cutting tool according to claim 1 , wherein in a view parallel with the axis line, an outer shape of the weight member is a racetrack shape, the racetrack shape defined by: a convex arc, an opposing concave arc, a first convexly curved end connecting a first end of the convex arc to a first end of the concave arc, and a second convexly curved end connecting a second end of the convex arc to a second end of the concave arc.
5 . The cutting tool according to claim 1 , wherein: the at least one elastic member includes a first elastic member at one end of each pin member and a second elastic member at another end of each pin member, and each of the plurality of anti-vibration members further includes a resin locator surrounding each pin member between the first elastic member and the second elastic member.
6 . A cutting processing device comprising: the cutting tool according to claim 1 ; and an adapter that holds the main body portion.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application is based on PCT filing PCT/JP2021/025777, filed on Jul. 8, 2021, which claims priority to Japanese Patent Application No. 2020-137877, filed on Aug. 18, 2020, the entire contents of each are incorporated herein by reference. TECHNICAL FIELD The present disclosure relates to a cutting tool and a cutting processing device. BACKGROUND ART Japanese Patent Laying-Open No. 2007-210036 (PTL 1) discloses a pin miller cutter for processing a crankshaft. The pin miller cutter has an insert, a main body portion, and an adapter. The insert is attached on the inner circumferential side of the main body portion. The adapter is attached on the outer circumferential side of the main body portion. CITATION LIST Patent Literature PTL 1: Japanese Patent Laying-Open No. 2007-210036 SUMMARY OF INVENTION A cutting tool according to the present disclosure is a cutting tool rotatable about an axis line, and includes a main body portion, a cutting insert, and a plurality of anti-vibration members. The main body portion has an inner circumferential surface and an outer circumferential surface opposite to the inner circumferential surface. The cutting insert is attached to at least one of the inner circumferential surface and the outer circumferential surface. Each of the plurality of anti-vibration members is provided at the main body portion. Each of the plurality of anti-vibration members includes a weight member composed of a material having a specific gravity larger than a specific gravity of a material of the main body portion. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic plan view showing a configuration of a cutting tool according to a first embodiment. FIG. 2 is a schematic side view showing the configuration of the cutting tool according to the first embodiment. FIG. 3 is a schematic plan view showing a configuration of a weight member of the cutting tool according to the first embodiment. FIG. 4 is a schematic plan view showing a configuration of an insertion member. FIG. 5 is a schematic cross sectional view showing a state in which an anti-vibration member is attached to a main body portion. FIG. 6 is a schematic cross sectional view along a line VI-VI of FIG. 5. FIG. 7 is a schematic plan view showing a configuration of a cutting processing device according to a second embodiment. FIG. 8 is a schematic plan view showing a configuration of a cutting tool according to a third embodiment. FIG. 9 is a schematic plan view showing a configuration of a weight member of the cutting tool according to the third embodiment. FIG. 10 is a schematic plan view showing a configuration of a cutting tool according to a fourth embodiment. FIG. 11 is a schematic side view showing a vibration measurement method. FIG. 12 is a diagram showing vibration measurement results. FIG. 13 is a schematic diagram showing configurations of a thrust surface and a cheek surface of a crankshaft. FIG. 14 is a diagram showing surface roughness measurement results. DETAILED DESCRIPTION Problem to be Solved by the Present Disclosure In the pin miller cutter, a filler having a specific gravity larger than that of the material of the adapter is provided in a recess formed in the adapter. Therefore, vibration generated due to contact of the insert with a workpiece is propagated to the adapter via the main body portion. Since the main body portion is located between the adapter and the insert, vibration to be damped cannot be sufficiently absorbed in the filler provided in the adapter. Therefore, vibration during a cutting process cannot be sufficiently attenuated. It is an object of the present disclosure to provide a cutting tool and a cutting processing device, by each of which vibration during a cutting process can be attenuated. Advantageous Effect of the Present Disclosure According to the present disclosure, there can be provided a cutting tool and a cutting processing device, by each of which vibration during a cutting process can be attenuated. Description of Embodiments First, embodiments of the present disclosure will be listed and described. (1) A cutting tool 100 according to the present disclosure is a cutting tool 100 rotatable about an axis line A, and includes a main body portion 10, a cutting insert 7, and a plurality of anti-vibration members 8. Main body portion 10 has an inner circumferential surface 4 and an outer circumferential surface 3 opposite to inner circumferential surface 4. Cutting insert 7 is attached to at least one of inner circumferential surface 4 and outer circumferential surface 3. Each of the plurality of anti-vibration members 8 is provided at main body portion 10. Each of the plurality of anti-vibration members 8 includes a weight member 20 composed of a material having a specific gravity larger than a specific gravity of a material of main body portion 10. In cutting tool 100 according to (1), each of the plurality of anti-vibration members 8 is provid