JPH0222192Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] Industrial field of use The invention is a tool that can be installed as a processing part of various machine tools and has the flexibility to easily follow the shape of the workpiece to be processed. This relates to spindle units.

Conventional technology In general, high centripetality is required for tools in extremely small diameter drilling and honing of various workpieces, but in conventional processing machines, the axis of rotation of the tool is fixed, so It is difficult to obtain centripetal properties, and high-precision machining cannot be expected, and the tool has drawbacks such as damage to the tip of the tool.

Problems that the invention aims to solve The invention provides a tool spindle with flexibility that allows it to easily follow the shape of the workpiece to be machined, and also provides a compact tool spindle unit that can be installed on various existing machine tools. This is what I am trying to do.

[Structure of the idea]

Means for Solving the Problems In view of the above, the present invention provides a tool spindle having a collet at its tip for removably holding various tools, which is rotatably supported on the axis of a spindle holder, and The holder is inserted into the outer case, and the end of the tool spindle is connected to the operating shaft via a universal joint, and the upper end of the spindle holder is connected to the outer case via a spherical movement mechanism centered on the axis. The lower end of the spindle holder is supported in a fixed position by a plurality of springs press-fitted radially from the outer case.
A tool spindle in which the outer end of the spring is supported in contact with the tapered surface of an adjuster string screwed into the outer periphery of an outer case, and the elastic force of the spring can be freely adjusted by pressing the tapered surface as the adjuster string moves. It is an attempt to solve the above-mentioned drawbacks by providing a unit.

Function In this invention, the spindle holder that supports the tool spindle is swingably supported by the upper support mechanism and the lower support mechanism with respect to the outer case.
Due to the action of centrifugal force that accompanies the rotation of the tool spindle, the tool is positioned in a perfectly centered position and continues to rotate, and when machining is performed with the side of the tool in contact with the machining surface during work such as deburring. The tool follows the machined surface by tilting the tool spindle in response to the contact pressure.

Embodiment An embodiment of the present invention will be described below based on the drawings. 1 is a main body of a tool spindle unit;
A mounting part 3 fixed to the outside of the cylindrical outer case 2
It is designed to be attached and fixed as a detachable unit to the machining parts of various machine tools.

Reference numeral 4 designates a tool spindle, which is equipped with a collet 6 at its tip for removably holding tools 5 such as various carbide tools, diamond tools, grindstones, etc.
The tool spindle 4 is rotatably supported on the axis of a cylindrical spindle holder 7,
The spindle holder 7 is inserted into the outer case 2.

8 is a spindle holder 7 for the outer case 2
It is an upper support mechanism of the spindle holder 7, and balls 9, 9 are placed on the outer circumference of the upper end of the spindle holder 7 at positions dividing the circumference into two
balls 9, 9 are formed on the outer periphery of the spindle holder 7.
A joint ring 13 is provided with set screws 12, 12a having recesses 11, 11a into which the joint ring 13 is fitted, and is arranged to be swingable about the axis connecting the balls 9, 9a, and the balls 9, 12a are arranged on the outer periphery of the joint ring 13. Similarly, recesses 15, 15a into which balls 14, 14a are fitted are formed at two equally divided positions on the circumference in a direction perpendicular to the axis connecting 9a, and balls 1 are formed in the outer case 2 opposite to the recesses 15, 15a.
4, 14a are inserted into the set screws 17, 17a, and the joint ring 13 is supported so as to be swingable about the axis connecting the balls 14, 14a. The balls 9, 9a, 14, and 14a constitute a spherical motion mechanism 18 that can swing the upper end of the spindle holder 7 in any direction about its axis.

On the other hand, 19 is a lower support mechanism of the spindle holder 7, which has spring receiving parts 20, 20a... formed at equal circumferentially spaced positions on the outer periphery of the lower part of the spindle holder 7, and facing the spring receiving parts 20, 20a... Spring cases 22, 22a are provided with support holes 21, 21a through the wall surface, and are slidably fitted into the support holes 21, 21a.
... and the spring receiving parts 20, 20a... are press-fitted with springs 23, 23a... arranged radially with respect to the spindle holder 7, so that the lower part of the spindle holder 7 is connected to the springs 23, 23a...
It is configured such that it is held in the center position by the elastic force of.

In addition, the springs 23, 23 arranged radially
It is desirable that a large number of at least three or more a... be provided.

Reference numeral 24 designates an elastic pressure adjustment mechanism for the springs 23, 23a, etc., and an adjuster string 27 is provided on the inner periphery thereof with a threaded portion 26 that is screwed into a threaded portion 25 carved on the outer periphery of the outer case 2. On the inner circumferential surface of the string 27, there are spring cases 22, 22a, .
A tapered surface 28 is provided around the edge of the
Tapered surface 28 for spring cases 22, 22a... accompanying screwing operation of adjuster string 27
The elastic holding force of the springs 23, 23a, etc. against the spindle holder 7 can be adjusted by the pressing action of the springs 23, 23a, etc., and the adjuster string 27 is fixed by the set bolt 29 screwed from the adjuster string 27 into the threaded portion 25 of the outer case 2. It is configured to be fixed in position.

Reference numeral 30 denotes a rotation drive unit, in which an operating shaft 3 is disposed on the axis of the tool spindle 4 in the upper part of the outer case 2.
1 is rotatably mounted, the lower end of the operating shaft 31 is connected via a universal joint 32 such as a spring, and the upper end of the operating shaft 31 is connected to a drive source separately installed in a machine tool or the like. A driven part 33 is formed.

3 and 4 show another embodiment, in which a motor 34 is mounted on the axis of the tool spindle 4 in the upper part of the outer case 2, and the motor 34 is mounted on the axis of the tool spindle 4.
4 is an operating shaft 31, and the motor is attached to the upper end of the tool spindle 4 via a universal joint 32, and the spherical motion mechanism 18 in the upper support mechanism 8 of the spindle holder 7 A pin 3 is used instead of the balls 9, 9a, 14, 14a as a component.
5, 35a, 36, 36a are adopted.

Next, the operation of the tool spindle unit according to the present invention will be explained. The main body 1 is attached and fixed to the processing section of a predetermined machine tool via the attachment section 3,
When the rotation of the operating shaft 31 is controlled in this state, the tool 5 at the tip rotates together with the tool spindle 4 via the universal joint 32, and at this time, the spindle holder 7 supporting the tool spindle 4 is supported above the outer case 2. Mechanism 8 and lower support mechanism 19
Since the tool 5 is supported in a swingable manner by the rotation of the tool spindle 4, the centrifugal force generated by the rotation of the tool spindle 4 allows the tool 5 to be perfectly positioned at the center and continue to rotate, which is required in ultra-small drilling, honing, etc. In addition, when processing with the side surface of the tool 5 in contact with the processing surface during work such as deburring, the tool spindle 4 is tilted according to the contact pressure.
Even when the machined surface is a complicated curved surface, it can be reliably tracked.

[Effect of idea]

In short, in the present invention, a tool spindle 4, which has a collet 6 at its tip that holds various tools 5 in a removable manner, is rotatably supported on the axis of a spindle holder 7, and the spindle holder 7
is inserted into the outer case 2, and the end of the tool spindle 4 is connected to the operating shaft 31 via the universal joint 32, and the upper end of the spindle holder 7 is centered on the outer case 2. The tool spindle is supported swingably via the spherical motion mechanism 18, and elastically supported in a fixed position by a plurality of springs 23, 23a, which are press-fitted into the lower end of the spindle holder 7 radially from the outer case 2. Since the lower end of 4 can swing freely in any direction around the axis of the upper end, the tool 5 can easily follow the shape of the workpiece to be machined, and the centrifugal force caused by the rotation of the tool spindle 4 can be avoided. As the tool 5 is positioned at the perfect center position and continues to rotate due to the action of 5 damage can be prevented,
Also, when the tool spindle 4 is tilted, the spring 2
3, 23a..., an elastic return force is applied in the center direction, so when deburring work on complex curved surfaces, etc., it is possible to perform a uniform deburring finish by contact, and the main body 1 is very compact. Therefore, by attaching it to the processing section of an existing machine tool via the mounting part 3, it can be used widely as a variety of processing machines, and the spring 2
The tapered surface 28 of the adjuster string 27 whose outer end portions 3, 23a... are screwed into the outer periphery of the outer case 2.
The spring 2 is supported by the tapered surface 28 as the adjuster string 27 moves.
Since the elastic force of the springs 3, 23a... can be adjusted freely, the elastic force of all the springs 23, 23a... can be adjusted simultaneously and equally by simply rotating the adjuster string 27. The effect is enormous.

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention.
The figure is a longitudinal cross-sectional view of the tool spindle unit according to the present invention, FIG. 2 is a cross-sectional view taken along line AA of the same, and FIGS. 3 and 4 are views showing other embodiments. 2... Outer case, 4... Tool spindle, 5
...Tool, 6...Collection, 7...Spindle holder, 18...Spherical motion mechanism, 23, 23a
... Spring, 27 ... Asia string, 2
8... Tapered surface, 31... Operating shaft, 32... Universal joint.

Claims (1)

[Scope of utility model registration request] A tool spindle, which has a collet at its tip for removably holding various tools, is rotatably supported on the axis of a spindle holder, and the spindle holder is inserted into the outer case, and the end of the tool spindle is inserted into the outer case. The upper end of the spindle holder is connected to the operating shaft via a universal joint, and the upper end of the spindle holder is swingably supported by the outer case via a spherical movement mechanism centered on the axis, and the lower end of the spindle holder is connected to the outer case. The outer end of the spring is supported in a fixed position by a plurality of springs that are press-fitted radially from the outer case. A tool spindle unit characterized in that the elastic force of a spring can be adjusted by applying pressure on a tapered surface.