JPH0852601A - Guide bush device - Google Patents

Abstract

PURPOSE:To provide an inexpensive guide bush device suitable for improving the machining accuracy of a workpiece. CONSTITUTION:After a workpiece is clamped by a collet 4, the collet 4 is unfastened so that a clearance between the workpiece and the collet is unfastened so that a clearance between the workpiece and the collect is compression spring 6 provided between the sleeve 3 and an adapter 5. Upon unfastening of the collet 4, the collet 4 is prohibited from its freely sliding, and then, the sleeve 3 is rotated by a prescribed amount.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide bush device used for a spindle moving type automatic lathe suitable for machining a bar material and for guiding the machining material, and particularly, it can improve the machining accuracy of the machining material. It is the one.

[0002]

2. Description of the Related Art Conventionally, in this type of guide bush device, it is necessary to provide a constant gap with respect to the diameter of the material to be machined from the viewpoint of improving the machining accuracy. The collet is provided, and the working material is supplied to the collet, and then the collet is tightened to adjust the gap between the collet and the working material.

As a means for tightening the collet, a manual work is generally used, but a closed loop method of tightening the collet using a pulse motor, a gap measuring device or the like without using the manual work, that is, a gap measuring device is used to process the collet. It is also known that the gap between the material and the material is measured and the pulse motor is driven based on this to tighten the collet.

[0004]

However, in the conventional guide bush device as described above, skill is required because the means for tightening the collet at the time of adjusting the gap with the processing material is manual. Therefore, the adjustment is difficult and there are many variations in the adjustment accuracy, which causes a decrease in the processing accuracy of the processing material. Further, variations in material diameter accuracy also lead to deterioration in processing accuracy.

On the other hand, when the means for tightening the collet at the time of adjusting the gap with the processing material is of the closed loop type as described above, the gap measuring device raises the cost and the measurement by the gap measuring device is performed. Based on this, a control circuit and the like for driving the pulse motor are also required, which makes the structure complicated and expensive.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an inexpensive guide bush device suitable for improving the processing accuracy of a processing material.

[0007]

In order to achieve the above object, the invention according to claim 1 is arranged in a cylindrical holder and is capable of sliding in the axial direction and rotating around the axial center. Sleeve, a collet that tightens or loosens in conjunction with sliding and rotation of the sleeve, and a processing material is supplied through the sleeve, and a biasing force that slides the sleeve to bias the collet in the tightening direction. Means and sleeve moving means for loosening the collet by moving the sleeve by a certain amount after the working material is supplied to the collet and tightened by the collet.

According to a second aspect of the present invention, the sleeve moving means is composed of a sleeve rotating mechanism portion capable of rotating the sleeve by a predetermined amount to loosen the collet.

The invention according to a third aspect is characterized in that the sleeve moving means comprises a sleeve slide mechanism portion capable of sliding the sleeve by a predetermined amount to loosen the collet.

[0010]

According to the present invention, after the working material is tightened by the collet, the sleeve moves by the sleeve moving means by a certain amount, whereby the collet is loosened, and the clearance of the working material is set between the collet and the collet. Is done.

According to the second aspect of the invention, the sleeve is rotated, and according to the third aspect of the invention, the collet is loosened by the sliding of the sleeve, so that the gap of the processing material is set between the collet and the collet.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a guide bush device according to the present invention will be described in detail below with reference to FIGS.

As shown in FIG. 1, this guide bush device has a cylindrical holder 2 having a circular cross section attached to an opening 1a of a frame 1, and a sleeve 3 is arranged in the cylindrical holder 2. The sleeve 3 is provided such that the sleeve 3 can slide in the axial direction of the cylindrical holder 2 and can rotate around the axial center.

A collet 4 is provided at the tip 3a of the sleeve 3, and the collet 4 is mounted in the cylindrical holder 2 via an adapter 5.

A taper portion 5a for opening and closing the collet 4 is provided inside the adapter 5, and by this taper portion 5a, the collet 4 is closed and tightened when it is slid in the direction of being drawn into the adapter 5, and is reversed. To adapter 5
It is configured to open and loosen when slid in the direction of being pushed out.

The collet 4 has its rear end side engaged with the inside of the sleeve 3 via a threaded portion (not shown) and can slide back and forth integrally with the sleeve 3, and the collet 4 is rotated when the sleeve 3 is rotated in the normal or reverse direction. It is also possible to slide back and forth via the screw part.

A rod-shaped processing material is supplied to the collet 4 from the rear end 3b of the sleeve 3 through the inside of the sleeve 3.

A compression spring 6 is arranged between the sleeve 3 and the adapter 5 as a biasing means for the sleeve, and the compression spring 6 causes the sleeve 3 to tighten the collet 4 (the collet 4 is pulled into the adapter 5). Direction) is biased while sliding.

On the rear end side of the sleeve 3, a sleeve rotating mechanism portion 7 is provided as a sleeve moving means, and the sleeve rotating mechanism portion 7 is provided with a sleeve grip block 700.

The sleeve grip block 700 is formed of an elastic member as shown in FIG. 2, and the elastic force of the sleeve grip block 700 can be used to open and close the sleeve 3 as a reference. On the other hand, when closed by an external force, the outer peripheral surface of the rear end of the sleeve 3 is clamped to prevent the sleeve 3 from freely sliding.

An external force of this kind is obtained by a hydraulic cylinder 701 arranged near the sleeve grip block 700 and a piston rod 702 for pressing the sleeve grip block 700 by the operation of the hydraulic cylinder 701.

As shown in FIG. 3, the sleeve grip block 700 has an arm 70 extending in the radial direction of the sleeve 3.
3 are integrally attached, and the arm 703 has an engaging pin 7
04 is connected to a piston rod 705, and the piston rod 705 is moved forward and backward by the operation of a hydraulic cylinder 706 for sleeve rotation, whereby the arm 703 can be swung via the engagement pin 704.

Next, the operation of the guide bush device constructed as described above will be described with reference to FIGS.

According to this guide bush device, the outer peripheral surface of the rear end of the sleeve 3 is first released from the sleeve grip block 700 to allow the sleeve 3 to slide freely, and then the rear end 3b of the sleeve 3 is pressed at a constant pressure. Press.

When pressed in this manner, the sleeve 3 and the collet 4 slide in the adapter 5, whereby the collet 4 opens and loosens.

After that, after inserting the processing material from the rear end 3b of the sleeve 3 through the inside of the sleeve 3 into the inside of the collet 4, when the pressing force applied to the rear end 3b of the sleeve 3 is released, the sleeve 3 and the adapter are released. Compression spring 6 between 5
Causes the sleeve 3 to be pressed with a constant pressure, and the sleeve 3 and the collet 4 return to their original positions.
Is closed and tightened, and the work material is tightened by the collet 4.

Next, the outer peripheral surface of the rear end of the sleeve 3 is clamped by the sleeve grip block 700 to prevent the sleeve 3 from freely sliding.

In this way, the free sliding of the sleeve 3 is prohibited, and then the sleeve rotating mechanism 7 rotates the sleeve 3 by a certain amount, whereby the collet 4 is loosened.

That is, when the free sliding of the sleeve 3 is prohibited, the sleeve rotating hydraulic cylinder 706 is operated, and the sleeve 3 is moved through the piston rod 705, the engaging pin 704, the arm 703 and the sleeve grip block 700. Rotate the collet 4 in a certain direction in a loosening direction.
Then, in conjunction with this rotation, the collet 4 slides in the adapter 5 by a certain amount, and as a result, the collet 4 loosens, and the gap between the collet 4 and the processing material is adjusted.

In order to allow the sleeve 3 to freely slide, the piston rod 702 is moved forward by the operation of the hydraulic cylinder 701, whereby the piston rod 7 is moved.
02 removes the force pressing the sleeve grip block 700, and elastically restores the sleeve grip block 700 to set it to the "open" state.

On the other hand, in order to prohibit the free sliding of the sleeve 3, the piston rod 702 is retracted by the operation of the hydraulic cylinder 701, and the piston rod 702 is then retracted.
The sleeve gripping block 700 is pressed with to elastically deform the sleeve gripping block 700 to set it in the “closed” state.

Therefore, in the guide bush device of the above-mentioned embodiment, after the working material is tightened by the collet, the sleeve rotating mechanism portion rotates the sleeve by a certain amount, thereby loosening the collet, so that Since it adjusts the gap, it is suitable for improving the processing accuracy of the processing material by reducing the variation of the adjustment accuracy as much as possible compared to the conventional method that relied on this kind of adjustment manually. Is.

Moreover, the guide bush device of this embodiment is inexpensive because the gap between the workpiece and the work material is adjusted by the rotation of the sleeve by the sleeve rotation mechanism portion without using an expensive gap measuring device or the like.

Further, in the guide bush device of this embodiment, the adjustment of the clearance with the processing material is to loosen the collet after tightening the processing material with the collet, so that the clearance with the processing material is It is adjusted to a constant value based on the diameter of the processing material. Therefore, in order to keep the gap with the processing material constant, it is not necessary to use a highly accurate processing material, and it is not necessary to select the processing material.

As the sleeve moving means, a sleeve slide mechanism portion 8 having a structure as shown in FIG. 4 can be applied instead of the sleeve rotation mechanism portion 7.

The sleeve slide mechanism portion 8 shown in the figure has a female screw portion 801 provided on the sleeve grip block 800, and a ball screw portion 802 engaging with the female screw portion 801.
The sleeve grip block 800 can be slid through the ball screw portion 802 and the female screw portion 801 by the rotation of the motor 803.

The basic structure of the sleeve grip block 800,
For example, the sleeve 3 is formed of an elastic member and can be opened and closed based on the elastic force of the sleeve 3, and the sleeve 3 can be freely opened to slide freely when there is no external force, and the sleeve 3 can be opened when the sleeve 3 is closed by an external force. Since the outer peripheral surface of the sleeve is clamped and the free sliding of the sleeve 3 is prohibited, it is the same as that of the sleeve grip block 700 of the sleeve rotation mechanism section 7 and its detailed description is omitted.

In such a sleeve slide mechanism portion 8, when the motor 803 is driven while the sleeve grip block 700 is clamping the outer peripheral surface of the sleeve 3, the ball screw portion 802, the female screw portion 801, and the sleeve grip block 800 are passed. The sleeve 3 slides in the direction to loosen the collet 4 (see FIG. 1). Then, the collet 4 slides in the adapter 5 in conjunction with this slide,
As a result, the collet 4 is loosened by a certain amount, and the gap between the collet 4 and the processing material is adjusted.

In the above embodiment, the collet 4 is drawn into the adapter 5 and the collet 4 is tightened thereby. Instead, the collet 4 is moved from the inside of the adapter 5 in the direction of the arrow as shown in FIG. A so-called collet pressing chuck mechanism that tightens when extruded can be applied.

[0040]

In the guide bush device according to the present invention, after the work material is tightened by the collet as described above, the sleeve is moved through the sleeve moving means, whereby the collet is loosened by a certain amount, Since it is configured to adjust the gap of the processing material between it and the collet, this kind of adjustment can be performed without manual work or an expensive gap measuring device, etc. It is possible to provide an inexpensive guide bush device which is reduced as much as possible and is suitable for improving the processing accuracy of the processing material.

Even in the inventions according to claims 2 and 3, the same effect as described above can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a guide bush device according to the present invention.

FIG. 2 is a sectional view taken along line II-II shown in FIG.

FIG. 3 is a view on arrow A shown in FIG.

FIG. 4 is an explanatory view of another embodiment of the sleeve moving means.

FIG. 5 is an explanatory view of another embodiment of the collet portion.

[Explanation of symbols]

 2 Holder 3 Sleeve 4 Collet 7 Sleeve rotating mechanism (sleeve moving means) 8 Sleeve slide mechanism (sleeve moving means)

Claims (3)

[Claims] 1. A sleeve, which is disposed in a tubular holder and is capable of sliding in the axial direction and rotating around the axial center, and tightens or loosens in conjunction with the sliding and rotating of the sleeve, A collet to which the processing material is supplied through the inside of the sleeve, an urging unit that slides the sleeve to urge the collet in a tightening direction, and the processing material is supplied to the collet, and the processing material is tightened by the collet. And a sleeve moving means for loosening the collet by moving the sleeve by a predetermined amount after being inserted. 2. The guide bushing device according to claim 1, wherein the sleeve moving means comprises a sleeve rotating mechanism capable of rotating the sleeve by a predetermined amount to loosen the collet. 3. The guide bushing device according to claim 1, wherein the sleeve moving means comprises a sleeve slide mechanism portion capable of sliding the sleeve by a predetermined amount to loosen the collet.