JP2001150263A - Main spindle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a main spindle device capable of machining while an ideal machining point is made to coincide with an actual machining point by causing the axis of a main spindle holding a tool or the like to cross the axis of a rotating shaft which orthogonally intersects the axis of the main spindle. SOLUTION: The main spindle device is provided with the rotating shaft 2 held against the end of a rotating tool or the like, a cylindrical outer tube 1 with the centers of its inside and outside diameters offset from each other and with the rotating shaft 2 rotatably held against its inside diameter portion, and an outer casing 6 holding the outer tube 1 in such a manner that the outer tube 1 is rotatable about the center of the outside diameter. With the centerline 5 of the rotating shaft 2 orthogonally intersecting the centerline 8 of a second rotating shaft 7, the outer tube 1 is rotated about the center of the outside diameter for adjustments such that the centerlines cross at points 14a and 14b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool with a numerical control, which has a spindle for holding a tool or a work and an axis perpendicular to the axis, and which can be rotated around each axis. Related to the device.

[0002]

2. Description of the Related Art Conventionally, a precision turning and machining automation TMA6 / 8 manufactured by Tsugami Co., Ltd. has been known as a main spindle spindle device which has an axis in a direction orthogonal to the axis of the main shaft and can rotate around each axis. Yes, the technology disclosed in this catalog will be described with reference to FIG.

The spindle spindle device has a spindle 22 having a chuck portion 22a for chucking a tool 21 at its tip.
And a rotary shaft 24 for holding the main shaft 22.
The main shaft 22 is driven by a spindle motor (not shown) about its center line (axis line) 23 and rotates in the direction of the arrow in the figure. One rotation shaft 24 has its center line (axis line)
Are orthogonal to the center line 23 of the main shaft 22, are driven by a servo motor (not shown), and rotate in the direction of the arrow in the figure. Therefore, the main shaft 22 also rotates around the center line of the rotating shaft 24.

[0004] Thus, if the spindle unit or the chuck unit 26 having the chuck portion 26a for chucking the work 25 is provided with a three-axis orthogonal movement axis, only a plane orthogonal to the center line 23 of the main shaft 22 is provided. Not
Processing on a plane having an arbitrary angle with respect to the center line 23 becomes possible.

[0005]

However, as described above, in a spindle spindle device having two orthogonal axes consisting of the spindle 22 and the rotation shaft 24 as the rotation axis, the axis of the spindle 22 and the rotation axis 24 orthogonal to the rotation axis. If the axes do not have an intersection, that is, if the axes of the two axes 22 and 24 do not intersect, the following problem occurs.

That is, a rotating shaft 24 orthogonal to the main shaft 22
According to the rotation of the tool, the processing point of the tool 21 (or the work) chucked at the tip of the main shaft 22 becomes an ideal processing point,
That is, there is a shift amount with respect to the processing point when the axis of the main shaft 22 intersects with the axis of the rotating shaft 24 orthogonal thereto.

This will be described with reference to FIG. In the following description of the conventional technology, the axis (center line 23) of the main shaft 22 is referred to as a first rotation shaft 23, and the axis of a rotation shaft 24 orthogonal to the first rotation shaft is referred to as a second rotation shaft 24. I do.

First, when the second rotating shaft 24 shown in FIG. 6A is at a position of 0 °, the ideal processing point 27 and the first
It does not match the rotation shaft 23 and the actual processing point 28 when the second and the rotary shaft 24 does not intersect, a horizontal deviation between both working points 27 and 28 and W _0.

[0009] Next, in a state of having the deviation _{W 0,} the second
Assuming that the horizontal deviation between the two processing points 27 and 28 when the rotating shaft 24 rotates by θ is W _θ , and the vertical deviation is h _θ , W _θ = W _{0 as} shown in FIG. COS _θ h _θ = W ₀ Sin _θ

As described above, the rotation of the second rotation shaft 24 causes the plane including the first rotation axis 23 to be parallel to the plane including the second rotation axis 24, that is, until θ = 90 °. As the rotation angle θ increases, the horizontal deviation _Wθ decreases and the vertical deviation _hθ increases.

That is, according to the rotation of the second rotary shaft 24, the difference between the ideal machining point 27 and the actual machining point 28 occurs, and appears as machining errors W _θ and h _θ . Since the machining errors W _θ and h _θ increase and decrease depending on the rotation angle θ of the second rotation shaft 24, they cannot be solved by simple mechanical correction, and require correction means using a complicated calculation formula.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has an object of realizing an ideal machining point and an actual machining point by intersecting an axis of a main shaft holding a tool or the like and a rotation axis having an axis perpendicular to the main axis. The present invention relates to a spindle spindle device capable of performing machining in a state where points are matched.

[0013]

According to a first aspect of the present invention, there is provided a spindle device according to a first aspect of the present invention, wherein the first spindle is arranged about an axis of a second rotating shaft orthogonal to the axis of the first rotating shaft. In a spindle spindle device in which a rotating shaft is rotatable, the first rotating shaft for holding a tool or a work at a tip, an outer diameter center and an inner diameter center are eccentric, and the first rotating shaft can be rotated on an inner diameter portion. And a second holding means for holding the first holding means rotatably about the center of the outer diameter. The first holding means is rotatable about the center of the outer diameter. It is possible to adjust it so that it intersects with the axis of the two rotation axes perpendicularly.

The spindle device according to a second aspect of the present invention is the spindle device according to the first aspect,
The second holding means includes fixing means for fixing the first holding means.

That is, in the spindle device according to the first aspect of the present invention, the first rotary shaft for gripping a tool or the like is provided on the inner diameter portion of the first holding means in which the center of the outer diameter and the center of the inner diameter are eccentric. Hold rotatably. Then, the first holding means is held by the second holding means, and the first holding means is rotated around the center of the outer diameter, so that the second rotating shaft having the axis of the first rotating shaft and the axis orthogonal to this axis is provided. Adjust to intersect with the axis of.

Further, in the spindle device according to the second aspect of the present invention, the state in which the axis of the first rotating shaft and the axis of the second rotating shaft intersect is fixed to the first holding means and the second holding means. To maintain.

[0017]

(Embodiment 1) Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a front view showing an outline of a spindle device according to the present embodiment, and FIG. 2 is a side view showing an outline of the spindle device.

This spindle device mainly comprises an outer cylinder 1 and a rotating shaft 2. The internal structure is omitted for simplification of description. The outer cylinder 1 as the first holding means or the spindle outer cylinder has a cylindrical shape having a certain amount of eccentricity at the center of the outer diameter and the center of the inner diameter. This eccentric amount is preferably slightly larger than the processing accuracy of the processing machine that processes the spindle.

A first rotating shaft or a rotating shaft 2 as a spindle is provided with a center line (axial line) 5 on the inner diameter portion of the outer cylinder 1.
Is held rotatably around the center of rotation. That is, the center of the outer diameter of the outer cylinder 1 and the center line 5 of the rotating shaft 2 are eccentric. A rotating tool 4 is provided at the tip of the rotating shaft 2.
(Or a work) is provided with a chuck 3.

The outer cylinder 1 is rotatably held by an outer box 6 as a second holding means around the center of the outer diameter of the outer cylinder 1 as a center of rotation. At the upper end of the outer box 6, an L-shaped pressing member 11 having an upper portion bent upwardly of the outer cylinder 1 is fixed, and a fixing member 12 such as a bolt is attached to a bent portion of the pressing member 11. I have. The holding member 11 and the stopping member 12
Functioning as fixing means, the stop member 12 is held in contact with and fixed to the outer cylinder 1 to prevent relative rotation between the outer cylinder 1 and the outer box 6.

A second rotating shaft 7 is fixed to the outer case 6 via a side surface having a rectangular outer shape with its center line (axis) 8 orthogonal to the center line 5 of the rotating shaft 2. Have been. The center line 8 of the second rotation axis 7 passes through the center of the outer diameter of the outer cylinder 1. The second rotation axis 7 is rotatably held by a support member 10 erected in a base shape (not shown), and is connected to a drive shaft of a servomotor 8 at an end thereof.
It is rotatable about a center line 8.

Next, the operation of the spindle device having the above configuration will be described with reference to FIGS. FIG. 3 is a top view showing the outline of the main spindle device, and FIG. 4 is an operation explanatory view of crossing the center line of the rotating shaft with the center line of the second rotating shaft.

When the outer cylinder 1 is inserted into the outer box 6 and the outer cylinder 1 is rotated around the center of the outer diameter, the rotating shaft 2 arranged at the inner diameter of the outer cylinder 1 is positioned at the center of the outer diameter of the outer cylinder 1. Turning around the center, the center of the rotating shaft 2 describes a circumference 13 centered on the outer diameter center. That is, the center line 5 of the rotating shaft 2 moves on the circumference 13. At this time, the circumference 13 is the center line 8 of the second rotating shaft 7.
Intersects at two points 14a and 14b, and at these points 14a and 14b, the axis (center line 5) of the rotating shaft 2 and the axis (center line 8) of the second rotating shaft 7 intersect with each other, and ideal processing is performed. The point and the actual processing point coincide. Then, in order to maintain this state, the outer cylinder 1 and the outer box 6 are fixed by the stopper member 12 of the holding member 11.

More specifically, as shown in FIG.
A disk (not shown, hereinafter referred to as a disk 16) having the same diameter as the disk 16 is mounted on the rotating shaft 2, and a pick tester is mounted on the outer periphery of each disk 16. It is preferable that the rotation of the two rotating shafts 2 and 7 is grasped from the numerical value thereof, and the intersection is fixed by the stop member 12 at the intersection.

According to the present embodiment, the center of the rotating shaft 2, that is, the center of the main shaft can be adjusted by eccentricity of the center of the outer diameter and the center of the inner diameter of the outer cylinder 1 of the main spindle spindle device. An intersection point with the center line 8 of the rotation axis 7 can be provided, that is, can intersect.

The technical idea having the following configuration can be derived from the specific embodiment described above. (Supplementary note) (1) In a machine spindle with a numerical control, a spindle spindle provided with a mechanism capable of rotational movement about an axis perpendicular to the axis of the spindle, the center of the outer diameter of the spindle outer cylinder and the center of the inner diameter of the spindle outer cylinder are aligned. A main spindle device wherein the eccentricity allows adjustment so that an axis of the spindle and an axis orthogonal to the axis of the spindle intersect.

According to the spindle device of the appendix (1), the spindle is adjusted so that the axis of the spindle intersects with the axis of the axis perpendicular to the spindle, and the ideal machining point and the actual machining point are matched. can do. Therefore,
Processing accuracy can be improved without using complicated correction values.

[0028]

As described above, according to the first aspect of the present invention,
According to the main spindle spindle device described above, it is possible to perform the adjustment in such a manner that the axis of the first rotation axis and the axis of the second rotation axis intersect, so that the ideal processing point and the actual processing point coincide. . Therefore, without using complicated correction values,
Processing accuracy can be improved.

Further, according to the spindle device according to the second aspect of the present invention, the state where the axes of the first rotation shaft and the second rotation shaft intersect can be easily maintained.

[Brief description of the drawings]

FIG. 1 is a front view showing an outline of a spindle spindle device according to a first embodiment of the present invention.

FIG. 2 is a side view showing an outline of the main spindle device according to the first embodiment of the present invention.

FIG. 3 is a top view showing an outline of the spindle spindle device according to the first embodiment of the present invention.

FIG. 4 is an operation explanatory view of crossing a center line of a rotation axis and a center line of a second rotation axis.

FIG. 5 is a diagram schematically showing a conventional technique.

FIG. 6 is an explanatory diagram of a processing state in a conventional technique.

[Explanation of symbols]

 1 outer cylinder 2 rotating shaft 5 center line 6 outer box 7 second rotating shaft 8 center line 13 circumference 14a, 14b point 15 pick tester

Claims (2)

[Claims] 1. A spindle device in which said first rotating shaft is rotatable about an axis of a second rotating shaft orthogonal to an axis of a first rotating shaft, wherein said first spindle holds a tool or a work at an end thereof. A rotating shaft, an outer diameter center and an inner diameter center are eccentric, and a cylindrical first holding means for rotatably holding the first rotating shaft in an inner diameter portion; A second holding means for rotatably holding at the center, wherein the adjustment is made so that the axis of the first rotation axis intersects with the axis of the second rotation axis in a state of being orthogonal to the axis. Main spindle device. 2. The apparatus according to claim 1, wherein said second holding means includes fixing means for fixing said first holding means.
Spindle device as described.