Tool having damper, cutting method using the same, and manufacturing method of impeller or guide vane of fluid machine

• US 20060275090A1
• Filed: 04/28/2006
• Published: 12/07/2006
• Est. Priority Date: 04/28/2005
• Status: Active Grant

• Current Assignee: Hitachi Tool Engineering, Ltd. (Mitsubishi Materials Corporation)
• Original Assignee: Hitachi Tool Engineering, Ltd. (Mitsubishi Materials Corporation)
• Inventors: Katou, Tomu, Onozuka, Hideaki, Takahashi, Hayato
• Granted Patent: US 7,661,912 B2
• Time in Patent Office: Days
• US Class Current: 408/143
• CPC Class Codes: B23B 29/022 with vibration reducing means
• CPC Class Codes: B23C 5/003 with vibration suppressing means
• CPC Class Codes: B23C 5/10 Shank-type cutters, i.e. with an integral shaft
• CPC Class Codes: Y10T 408/76 Tool-carrier with vibration-damping means
• CPC Class Codes: Y10T 409/304312 with means to dampen vibration

Abstract

Disclosed herein is the structure of a damper that is capable of improving the degree of freedom in design to optimize the damping characteristics of the damper and is capable of allowing the damper to be easily optimized and manufactured for a wide variety of dynamic stiffness characteristics of a tool body, and a manufacturing method using the same. A plurality of ring-shaped elastic members are disposed at opposite ends of a weight part. The weight part is connected to the tool body via the elastic members. Consequently, the weight part is moved relative to the tool body. The plurality of elastic members are mounted while spacers are disposed between the elastic members, and the spacers are moved with respect to the weight part in the axial direction thereof. A viscous fluid is filled in the region surrounded by the outer circumferential surfaces of the spacers, the elastic members, and the inner surface of a hollow part of the tool body. Consequently, it is possible to damp the relative movement of the weight part with respect to the tool body.

Claims

1. A tool having a damper, that comprising:

a hollow part extending in the axial direction in a tool body; and

an substantially cylindrical weight part mounted in the hollow part such that the weight part can be moved relatively to the tool body;

wherein

the weight part is provided with hermetically-sealed annular spaces at opposite ends thereof opposite to each other in the axial direction; and

the annular spaces are filled with a viscous fluid.

2. The tool having the damper according to claim 1, wherein

the hermetically-sealed annular space is composed of a region surrounded by a pair of ring-shaped elastic members disposed at the opposite end of the weight part, a ring-shaped spacer having stiffness disposed between the ring-shaped elastic members, and an inner surface of the hollow part of the tool body;

and

the tool further comprising;

a unit for moving the spacer in the axial direction.

3. The tool having the damper according to claim 1, wherein

the hermetically-sealed annular space is composed of a region surrounded by a pair of ring-shaped elastic members disposed at the opposite end of the weight part, a ring-shaped spacer having stiffness disposed between the ring-shaped elastic members, and an outer surface of the weight part;

and

the tool further comprises a unit for moving the spacers in the axial direction.

4. The tool having the damper according to claim 1, wherein

the tool body is constituted capable of changing a damping characteristics by changing a thickness of the layer of viscous fluid or a viscosity of the viscous fluid.

5. A tool having a damper, comprising:

a hollow part extending in the axial direction in a tool body; and

a substantially cylindrical weight part movably mounted in the hollow part, wherein the tool further comprising;

ring-shaped elastic members disposed at the opposite ends of the weight part in pairs;

a spacer having stiffness disposed between the ring-shaped elastic members such that the spacer can be moved with respect to the weight part in the axial direction; and

a unit for moving the spacer in the axial direction.

6. The tool having the damper according to claim 5, further comprising:

a viscous fluid filled in a region surrounded by the pair of elastic members, the surface of the spacer, and the hollow part of the tool body.

7. The tool having the damper according to claim 6, wherein the tool body is capable of changing the damping characteristics by changing the thickness of the layer of viscous fluid or the viscosity of the viscous fluid.

8. A method of manufacturing a tool having a damper, comprising:

a hollow part extending in the axial direction in a tool body; and

an substantially cylindrical weight part movably mounted in the hollow part,

wherein the damper comprises a pair of ring-shaped elastic members disposed at the opposite ends of the weight part in pairs;

a spacer disposed between the ring-shaped elastic members such that the ring-shaped spacer can be moved with respect to the weight part in the axial direction, the ring-shaped spacer being components different from the weight part, the ring-shaped spacer having stiffness; and

a viscous fluid filled in annular space surrounded by the elastic members, the surface of the spacer, and the hollow part of the tool body;

wherein the method comprises the steps of;

selecting one of a plurality of spacers having different diameters, which are previously prepared; and

deciding the thickness of the layer of the viscous fluid, using the selected spacer, to set the damping characteristics of the tool body.

9. A method of manufacturing an impeller or a guide vane of a fluid machine by cutting the impeller or the guide vane of the fluid machine using a plurality of cutting tools including long cutting tools;

wherein each long cutting tool has a damper, comprising;

a hollow part extending in the axial direction in a tool body; and

an substantially cylindrical weight part mounted in the hollow part such that the weight part can be moved relative to the tool body;

wherein the method comprises the steps of;

preparing a plurality of long cutting tools having different lengths;

cutting a bulk material using a short cutting tool; and

replacing the long cutting tools with new ones in the order of length in response to the cutting process; and

cutting the impeller or the guide vane in the shape of a spiral along the flow channel of a fluid.

10. A fluid machine having an impeller or a guide vane;

wherein

the impeller or the guide vane is cut from a bulk material in the shape of a spiral along the flow channel of a fluid using a plurality of cutting tools, including long cutting tools, having a damper that comprises hermetically-sealed annular spaces formed at opposite ends of a weight part and a viscous fluid filled in the annular spaces.