JP-7855777-B1 - Tool heads, machine tools, tool arbors, and tool units

JP7855777B1JP 7855777 B1JP7855777 B1JP 7855777B1JP-7855777-B1

Abstract

[Problem] To provide a tool head, machine tool, tool arbor, and tool unit that facilitate high-speed rotation of the tool. [Solution] The tool head 20 comprises a tool arbor 21, a tool 50, a first spindle, a second spindle, a first balancer 25, and a second balancer 26. The tool arbor, tool, first spindle, second spindle, first balancer, and second balancer are arranged coaxially with the axis of rotation. At least a portion of the first balancer is positioned between the tool and the first spindle in the axial direction. At least a portion of the second balancer is positioned between the tool and the second spindle in the axial direction. At least a portion of the first balancer is positioned radially inward from the radial inner end of the tool. [Selection Diagram] Figure 3

Inventors

笹井浩昭

Assignees

ニデックマシンツール株式会社

Dates

Publication Date: 20260508
Application Date: 20250925
Priority Date: 20241029

Claims (20)

A cylindrical tool arbor extending axially along the axis of rotation, A cylindrical tool held on the outer surface of the tool arbor, A first spindle rotatably supports the unit including the tool arbor on one axial side of the tool, A motor located on one side in the axial direction from the tool, which rotates the first spindle, A second spindle rotatably supports the unit including the tool arbor on the other axial side of the tool, A first balancer that corrects the mass balance around the rotation axis on one side in the axial direction from the tool, A second balancer is provided on the other axial side of the tool, which corrects the mass balance around the rotation axis, A tool head equipped with, The tool arbor, the tool, the first spindle, the second spindle, the first balancer, and the second balancer are arranged coaxially with the rotation axis. At least a portion of the first balancer is positioned axially between the tool and the first spindle, At least a portion of the second balancer is positioned axially between the tool and the second spindle, A tool head wherein at least a portion of the first balancer is positioned radially inward from the radially inward end of the tool.
A tool head according to claim 1, The radial outer end of the first balancer is positioned radially inward from the radial outer end of the tool, in the tool head.
A tool head according to claim 1, A tool head wherein at least a portion of the second balancer is positioned radially inward from the radially inward end of the tool.
A tool head according to claim 3, The radial outer end of the second balancer is positioned radially inward from the radial outer end of the tool head.
A tool head according to any one of claims 1 to 4, The first balancer and the second balancer are, A solid shaft extending in the axial direction, One or more weights are arranged on the outer surface of the solid shaft, A tool head having
A tool head according to any one of claims 1 to 4, At least a portion of the first balancer is a tool head positioned radially inward of the tool arbor.
A tool head according to claim 6, The aforementioned tool arbor is A small diameter cylindrical portion inserted radially inward into the tool, A first cylindrical portion is positioned on one side in the axial direction from the aforementioned small-diameter cylindrical portion and has a larger diameter than the aforementioned small-diameter cylindrical portion, A first enlarged diameter portion connecting the small diameter cylindrical portion and the first cylindrical portion, It has, The outer surface of the first balancer is in contact with the inner surface of the first cylindrical portion. The first balancer is a tool head that contacts or faces the first enlarged diameter portion in the axial direction.
A tool head according to claim 7, The tool arbor further comprises a first collector member positioned on one axial side and holding a conductor connected to the first balancer, The tool arbor has a first tapered surface that is inclined with respect to the axial and radial directions, A tool head in which the first collector member contacts the first tapered surface.
A tool head according to any one of claims 1 to 4, On the other axial side of the tool, the tool arbor is further provided with a counter flange connected to the tool arbor, At least a portion of the second balancer is a tool head positioned radially inward of the counter flange.
A tool head according to claim 9, The aforementioned counter flange is A connecting portion inserted radially inward of the tool arbor, A second cylindrical portion is located on the other side in the axial direction from the aforementioned connecting portion and has a larger diameter than the aforementioned connecting portion, A second enlarged diameter portion connects the aforementioned connecting portion and the second cylindrical portion, It has, The outer surface of the second balancer is in contact with the inner surface of the second cylindrical portion. The second balancer is a tool head that contacts or faces the second enlarged diameter portion in the axial direction.
A tool head according to claim 10, The counter flange is further provided with a second collector member positioned on the other axial side and holding a conductor connected to the second balancer, The counter flange has a second tapered surface that is inclined with respect to the axial and radial directions. A tool head in which the second collector member contacts the second tapered surface.
A tool head according to claim 10, The connecting portion is a tool head having a support mechanism for supporting the tool arbor.
A tool head according to any one of claims 1 to 4, The first spindle is a tool head having a first flow path extending in the axial direction.
A tool head according to any one of claims 1 to 4, The second spindle is a tool head having a second flow path extending in the axial direction.
A tool head according to any one of claims 1 to 4, The first housing further comprises the first spindle, The radial outer end of the first balancer is positioned radially inward from the radial outer end of the first housing, and this is a tool head.
A tool head according to claim 15, At least a portion of the first balancer is a tool head positioned radially inward of the first housing.
A tool head according to any one of claims 1 to 4, The second housing further comprises the second spindle, The tool head is positioned such that the radially outer end of the second balancer is radially inward from the radially outer end of the second housing.
A tool head according to claim 17, At least a portion of the second balancer is a tool head positioned radially inward of the second housing.
A tool head according to any one of claims 1 to 4, The system further comprises a first bearing that supports the first spindle, The tool head is positioned such that the radially outer end of the first balancer is radially inward from the radially inner end of the first bearing.
A tool head according to any one of claims 1 to 4, The system further comprises a second bearing that supports the second spindle, The tool head is positioned such that the radially outer end of the second balancer is located radially inward from the radially inner end of the second bearing.

Description

This invention relates to a tool head, a machine tool, a tool arbor, and a tool unit. Conventional machine tools for processing workpieces are known. These machine tools are equipped with a tool head that rotates while holding the tool. A conventional machine tool equipped with a tool head is described, for example, in Patent Document 1. The tool head of Patent Document 1 comprises a first spindle shaft, a second spindle shaft, a first balancing device, and a second balancing device. The tool is positioned between the first spindle shaft and the second spindle shaft. The first balancing device is positioned between the spindle bearing and the tool-side end of the first spindle shaft. The second balancing device is positioned between the spindle bearing and the tool-side end of the second spindle shaft. Special Publication No. 2024-501807 Figure 1 is a front view of a machine tool.Figure 2 is a plan view of the machine tool.Figure 3 is a longitudinal cross-sectional view of the tool head.Figure 4 is a partial longitudinal cross-sectional view of the tool head near the first balancer.Figure 5 is a partial longitudinal cross-sectional view of the tool head near the second balancer.Figure 6 is a longitudinal cross-sectional view of the tool head according to the first modified example.Figure 7 is a longitudinal cross-sectional view of the tool head according to the second modified example.Figure 8 is a longitudinal cross-sectional view of the tool, tool arbor, counter flange, first balancer, and second balancer according to the third modified example.Figure 9 is a longitudinal cross-sectional view of a tool, tool arbor, counter flange, first balancer, and second balancer relating to another example of the third modified example. <1. Configuration of a machine tool> Figure 1 is a front view of a machine tool 1 according to one embodiment. Figure 2 is a plan view of the machine tool 1 near the workpiece 9 and the tool head 20. The machine tool 1 is a device that processes the workpiece 9 with a tool 50. The machine tool 1 is, for example, a grinding machine that grinds the workpiece 9. Note that in Figures 1 to 7, the dimensions of the actual product may differ from the dimensions in the drawings in order to facilitate understanding of the gist of the invention. Workpiece 9 is a workpiece that will become a gear, for example, by grinding to create a high-quality tooth surface shape. Workpiece 9 is roughly cylindrical and has multiple teeth 91 on its outer surface. Hereinafter, the central axis of workpiece 9 will be referred to as "workpiece axis X1". As shown in Figures 1 and 2, the machine tool 1 comprises a workpiece rotation mechanism 10, a tool head 20, a moving mechanism 30, and a control unit 40. The workpiece rotation mechanism 10, the tool head 20, and the moving mechanism 30 are mounted on a common bed 90. The workpiece rotation mechanism 10 is a mechanism that rotates the workpiece 9 around the workpiece axis X1. The workpiece rotation mechanism 10 includes a pair of clampers for holding the workpiece 9 and a motor for rotating the clampers. In this embodiment, the workpiece 9 rotates while being held in a position where the workpiece axis X1 faces vertically. However, the orientation of the workpiece axis X1 does not necessarily have to be vertical. The tool head 20 is a mechanism that holds and rotates the tool 50. The tool 50 is, for example, a grinding wheel. The tool 50 is roughly cylindrical and has a helical groove 51 on its outer surface. Hereinafter, the central axis of the tool 50 will be referred to as the "tool axis X2". The tool head 20 holds the tool 50 in a position where the tool axis X2 is horizontally positioned. The tool head 20 then rotates the tool 50 around the tool axis X2. The detailed structure of the tool head 20 will be described later. However, the tool head 20 may also hold the tool 50 in a position where the tool axis X2 is not horizontal. The moving mechanism 30 is a mechanism for moving the tool head 20 relative to the workpiece 9. The moving mechanism 30 includes a first moving mechanism 31, a second moving mechanism 32, and a third moving mechanism 33. The first moving mechanism 31 moves the tool 50 relative to the workpiece 9 in a direction parallel to the workpiece axis X1. The second moving mechanism 32 moves the tool 50 relative to the workpiece 9 in a direction parallel to the tool axis X2. The third moving mechanism 33 moves the tool 50 toward and away from the workpiece 9. The first moving mechanism 31, the second moving mechanism 32, and the third moving mechanism 33 are implemented, for example, by a motor and a ball screw that converts the motor's rotation into linear motion. These first, second, and third moving mechanisms 31, 32, and 33 allow the moving mechanism 30 to move the tool 50 relative to the workpiece 9 in any direction in three-dimensional space. Furthermore, the moving mechanism 30 may include a fourth moving mechanism for adjusting the intersec