JP2015044263A - Guide bush device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly support a material. by following up a variation in an outer diameter of the material, in a guide bush device.SOLUTION: The guide bush device is provided with: a guide bush 40 movably inserted in the axis Z direction into a guide bush sleeve 30, adjusting opening in response to a position in the axis Z direction and energized to the rear R in the axis Z direction; a draw bar 50 forming a taper 53 of becoming large in an outer diameter toward the rear R on an outer peripheral surface 52 and freely movable in the axial direction C integrally with the guide bush 40; and a fixing member 60 movable along the axis Z direction, fixing the guide bush sleeve 30 and the draw bar 50 by being sandwiched between an inner peripheral surface 33 of the guide bush sleeve 30 and the taper 53 of the draw bar 50 and energized to the rear R.

Description

  The present invention relates to a guide bush device.

Conventionally, a guide bush device for supporting a material (a workpiece) is known.
This guide bush device is used in a processing device such as a lathe.
As a guide bushing device, a device having a guide bushing which is inserted into a guide bushing sleeve so as to be movable in the front-rear direction, the opening degree is adjusted in accordance with the position in the front-rear direction, and is biased rearward is proposed. (Patent Document 1).
According to this guide bush device, the inner diameter of the guide bush changes following the outer diameter of the material by adjusting the opening of the guide bush.

Japanese Patent Laid-Open No. 9-19802

However, according to the guide bush device of Patent Document 1, when processing is performed while pushing the material forward from the main shaft side, a load acts in a direction in which the inner diameter of the guide bush increases, and the material may not be supported appropriately. is there.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a guide bush device that can follow the variation in the outer diameter of the material and can support the material appropriately.

  A guide bush device according to the present invention is inserted into a guide bush sleeve so as to be movable in the front-rear direction, the opening degree is adjusted according to the position in the front-rear direction, and the guide bush is urged rearward, and the guide A taper that moves in the front-rear direction integrally with the bush, and is movable in the front-rear direction and is biased rearward, and is moved rearward to engage the taper surface to move the guide bush forward. And a fixing member that regulates.

  The guide bush device according to the present invention can follow the variation in the outer diameter of the material and can appropriately support the material.

It is sectional drawing which shows the guide bush apparatus (rotary guide bush apparatus) which concerns on one Embodiment of this invention. It is a figure which shows the detail of the taper part of the draw bar and fixing member in the guide bush apparatus shown in FIG. FIG. 3 is a view corresponding to FIG. 2 and showing a state in which the fixing of the draw bar is released by pressing the fixing member and the draw bar forward. FIG. 3 is a view corresponding to FIG. 2, showing a state in which the position of the sphere of the fixing member in the direction along the axis and the position of the hole of the draw bar coincide. It is sectional drawing by the surface along the AA line of the guide bush apparatus shown in FIG. It is sectional drawing which shows the guide bush apparatus (fixed type guide bush apparatus) which concerns on other embodiment of this invention.

  Hereinafter, an embodiment of a guide bush device according to the present invention will be described with reference to the drawings.

The guide bush device 100 of the present embodiment is disposed in front of a main spindle of an automatic lathe that is an example of a processing device, and as illustrated in FIG. 1, a guide bush holder 10, a guide bush sleeve 30, a guide bush 40, A draw bar 50 having a taper 53, a bearing (radial ball bearing) 21, a fixing member 60, and biasing members (springs) 71 and 72 are provided.
A rod-shaped material 300 (object to be processed) gripped by the main shaft is inserted and supported by the guide bush 40 and is guided by the guide bush device 100 when the material 300 is processed.

The guide bush holder 10 is fixed to a tool post 210 on which a tool 220 for processing the material 300 is held.
A guide bush sleeve 30 is inserted into the guide bush holder 10.

A radial ball bearing 21 is disposed between the guide bush holder 10 and the guide bush sleeve 30.
The outer ring of the radial ball bearing 21 is held on the guide bush holder 10 side by a bearing pressing ring 25.
The inner ring of the radial ball bearing 21 is held on the guide bush sleeve 30 side via a pulley 26 by a nut 27 screwed onto the outer periphery of the guide bush sleeve 30.
The guide bush sleeve 30 is rotatable about an axis Z with respect to the guide bush holder 10 via a radial ball bearing 21.

The pulley 26 is disposed outside the guide bush sleeve 30 in the radial direction.
Between the pulley 26 and the guide bush sleeve 30, keys 28 are arranged to engage with each other.
The pulley 26 and the guide bush sleeve 30 can rotate integrally around the axis Z via a key 28.
The position of the pulley 26 in the axis Z direction is fixed by a nut 27.

A guide bush 40 is inserted inside the guide bush sleeve 30.
The front bush F of the guide bush 40 in the axis Z direction is formed with a slit which is a cut extending in the axis Z direction, and the outer diameter of the taper 45 decreases toward the rear R. Is formed.
A groove 41 extending in the axis Z direction is formed on the outer peripheral surface of the guide bush 40.
A screw 32 passed through a hole 31 formed in the guide bush sleeve 30 is fitted in the groove 41.
As a result, the guide bush 40 and the guide bush sleeve 30 can rotate integrally around the axis Z, while the guide bush 40 can be displaced in the axis Z direction (front-rear direction) with respect to the guide bush sleeve 30. It has become.

A taper 35 corresponding to the taper 45 is formed on the inner peripheral surface of the front F portion of the guide bush sleeve 30 in the axis Z direction.
When the guide bush 40 is displaced rearward R in the axis Z direction with respect to the guide bush sleeve 30, the taper 45 is pressed against the taper 35, and the guide bush 40 is adjusted in a direction in which the diameter of the front end portion is reduced by sliding. The inner diameter (opening degree) of the front F portion of the lens changes.

  When the pulley 26 is driven to rotate about the axis Z, the guide bush sleeve 30 and the guide bush 40 rotate together with the pulley 26.

A hollow cylindrical draw bar 50, which is an example of a moving member, is screwed into the rear R end of the guide bush 40, and the guide bush 40 and the draw bar 50 are integrally displaced in the axis Z direction.
The taper 53 is formed on the outer peripheral surface 52 of the rear portion of the draw bar 50 so that the outer diameter increases toward the rear R in the axis Z direction.
On the inner peripheral surface of the draw bar 50, two grooves 55 extending in the axis Z direction are formed at intervals of an angle of 180 degrees around the axis Z (see FIG. 5).
The draw bar 50 can be screwed into the guide bush 40 with a jig or the like through the groove 55.

A first spring 71 is provided between the guide bush sleeve 30 and the draw bar 50 and on the outer side of the guide bush 40 to apply an elastic force along the axis Z direction.
The guide bush 40 and the draw bar 50 are urged so as to be integrally displaced rearward R with respect to the guide bush sleeve 30 by the elastic force of the first spring 71.

As shown in FIGS. 2 and 3, the fixing member 60 includes a cylindrical frame 61 and a sphere 62.
The frame body 61 is provided outside the rear portion of the draw bar 50 so as to be movable in the axis Z direction.
Three spheres 62 are provided in the present embodiment (see FIG. 5).
Each spherical body 62 is accommodated in a hole penetrating in the radial direction formed in the frame body 61 at equal intervals of an angle of 120 degrees around the axis Z.
The spherical body 62 is formed to have a diameter larger than the thickness of the frame body 61, protrudes in the radial direction from the frame body 61, and is disposed so as to be movable in the radial direction with respect to the frame body 61.
As shown in FIG. 4, the sphere 62 is inserted into and removed from the frame 61 through a hole 54 having a diameter larger than that of the sphere 62 formed in the peripheral wall of the draw bar 50. be able to.

A second spring 72 for applying an elastic force along the axis Z direction is provided between the frame body 61 and the draw bar 50 and outside the draw bar 50.
The frame body 61 is biased so as to be displaced rearward R with respect to the draw bar 50 by the elastic force of the second spring 72.
When the frame body 61 is displaced to the rear R, the spherical body 62 is displaced to the rear R together with the frame body 61, and the spherical body 62 rides on the taper 53.
When the sphere 62 is sandwiched between the inner peripheral surface 33 of the guide bush sleeve 30 and the taper 53, the draw bar 50 is restricted from moving relative to the guide bush sleeve 30 in the forward direction F in the axis Z direction. The positions of the shaft 50 and the guide bush 40 in the axis Z direction are fixed with respect to the guide bush sleeve 30.
The second spring 72 is set so that the frame body 61 can be pressed backward to a position where the spherical body 62 rides on the taper 53.

In a state in which the draw bar 50 is fixed, the rear end surface 61 a of the frame body 61 protrudes rearward R from the rear end surface 30 a of the guide bush sleeve 30.
At this time, the rear end surface 50 a of the draw bar 50 protrudes rearward R from the rear end surface 30 a of the guide bush sleeve 30 and is positioned forward F from the rear end surface 61 a of the frame body 61.
When the frame 61 is moved forward F against the elastic force of the second spring 72, the sphere 62 moves forward F together with the frame 61, so that the sphere 62 and the inner peripheral surface 33 of the guide bush sleeve 30. The gap between the taper 53 and the guide bush sleeve 30 is released, and the draw bar 50 and the guide bush 40 are fixedly released.
The guide bush 40 is integrated with the draw bar 50 and the guide bush sleeve 30 by moving the frame body 61 and the draw bar 50 integrally in the axis Z direction with the draw bar 50 and the guide bush 40 being fixed. To the axis Z direction.

When the guide bush 40 is moved forward F against the elastic force of the first spring 71, the pressure applied to the taper 45 by the taper 35 is loosened, and the sliding of the front end portion of the guide bush 40 is expanded, so that the guide bush The inner diameter of the front F portion of 40 is increased.
The guide bush 40 is allowed to insert the material 300 in a state where the inner diameter is enlarged.
However, in the state where the inner diameter is enlarged, the clearance between the inner diameter of the guide bush 40 and the material 300 is excessive, and the material 300 cannot be properly supported and guided by the guide bush 40, and the material 300 is restrained by the guide bush 40. Without being passed.

The rear end surface 61a of the frame 61 is pressed forward F by the front end surface of the main spindle of the automatic lathe that holds the material 300, for example.
Thereby, when processing the material 300, first, the main shaft is advanced, the frame body 61 is pressed forward F, and the fixing of the draw bar 50 by the fixing member 60 is released.
When the position of the rear end surface 61a of the frame body 61 and the rear end surface 50a of the draw bar 50 coincide with each other in the axis Z direction by continuing the advancement of the main shaft, the draw bar 50 is integrated with the frame body 61 by the front end surface of the main shaft. The inner diameter of the guide bush 40 is increased so that the material 300 can pass freely.
In this state, by feeding the material 300 to the front F from the state where the chuck of the main shaft is open, the material 300 is inserted into the guide bush 40 from the rear R and passed through the guide bush 40 without restriction.

After the material 300 is passed through the guide bush 40, when the main shaft is moved rearward R with the chuck of the main shaft open, the draw bar 50 and the second spring 72 urged by the first spring 71 are used. The urged frame body 61 moves backward together with the main shaft.
When the guide bush 40 retreats together with the draw bar 50 and the guide bush 40 becomes smaller in size and the guide bush 40 comes into contact with the outer peripheral surface of the material 300, the guide bush 40 holds the material 300 by the biasing force of the first spring 71. At the position, the displacement of the draw bar 50 and the guide bush 40 toward the rear R stops (FIG. 2).
That is, the inner diameter of the guide bush 40 is adjusted to a state that appropriately follows the outer diameter even if the outer diameter of the material 300 varies.

When the main shaft further retracts from this state, the frame body 61 retreats together with the main shaft by the biasing force of the second spring 72.
Then, when the spherical body 62 reaches a position where it is sandwiched between the taper 53 of the draw bar 50 and the inner peripheral surface 33 of the guide bush sleeve 30, the retraction of the frame body 61 and the spherical body 62 stops.
In the state where the frame body 61 and the sphere body 62 are retracted, the positions of the draw bar 50 and the guide bush 40 in the axis Z direction are fixed, and the draw bar 50 is prevented from moving forward F (FIG. 2).

When the machining operation by the automatic lathe is started, the material 300 is fed to the front F while being chucked by the main shaft.
The guide bush device 100 serves as a guide bush device as a rotary guide bush device in a state in which the outer peripheral surface of the material 300 is constrained so as to allow movement of the material 300 in the axis Z direction by the elastic force of the first spring 71. 40 supports and guides material 300 as it rotates.
At this time, due to the contact between the material 300 and the guide bush 40, the guide bush 40 is likely to be displaced forward F together with the material 300.
If the guide bush 40 is displaced to the front F together with the material 300, the inner diameter of the guide bush 40 becomes large and the support for the material 300 may be loosened.
However, in the guide bush device 100 of the present embodiment, the guide bush 40 is fixed to the guide bush sleeve 30 integrally with the draw bar 50 by the fixing member 60, so that it is connected to the movement of the material 300 to the front F. And is not displaced forward F.
Therefore, the support to the material 300 by the guide bush 40 is not loosened, and the material 300 can be stably and appropriately guided.

On the other hand, when the material 300 is exchanged, the inner diameter of the guide bush 40 is increased by the biasing force of the first spring 71 after the material 300 is passed through the guide bush 40 with the inner diameter of the guide bush 40 enlarged. Therefore, the inner diameter of the guide bush 40 need not be manually adjusted every time the material 300 is replaced.
Therefore, even when the material 300 having a certain degree of variation in the outer diameter is used, the working efficiency of the processing is not lowered, so that the cost can be reduced.
The guide bush device 100 according to the present embodiment has a small variation in the outer diameter in a single material such as an abrasive or a drawing material, but a variation in the outer diameter is not small for each lot. More effective when using materials.

The guide bush device 100 according to the present embodiment is a rotary guide bush device in which the guide bush sleeve 30, the guide bush 40, and the draw bar 50 rotate about the axis Z together with the pulley 26. It is not limited to the form, and may be a fixed guide bush device in which the guide bush sleeve, the guide bush and the draw bar do not rotate.
For example, a fixed guide bush device 100 ′ shown in FIG. 6 is another embodiment of the guide bush device according to the present invention, and a guide bush sleeve 30 ′ that also serves as a guide bush holder and a guide bush that supports and guides the material 300. 40 ', a draw bar 50' having a taper 53 ', a fixing member 60', and two springs 71 'and 72'.
Here, the guide bush sleeve 30 ′, the guide bush 40 ′, the draw bar 50 ′, the fixing member 60 ′, and the two springs 71 ′ and 72 ′ are respectively the guide bush sleeve 30 and the guide in the guide bush device 100 shown in FIG. The bush 40, the draw bar 50, the fixing member 60, and the springs 71 'and 72' are the same as or correspond to exhibit the same action.
The guide bush device 100 ′ configured in this way can obtain the same effects as the guide bush device 100 shown in FIG. 1.

  In the guide bush device of the present invention, the tapers 53 and 53 'may be formed integrally with the guide bushes 40 and 40'.

30 Guide bush sleeve 33 Inner peripheral surface 40 Guide bush 50 Draw bar 52 Outer peripheral surface 53 Taper 60 Fixing member 62 Spherical body 71, 72 Spring 100 Guide bush device 300 Material (workpiece)
C axis F front R rear

Claims (4)

A guide bush that is inserted into the guide bush sleeve so as to be movable in the front-rear direction, the opening degree is adjusted according to the position in the front-rear direction, and the guide bush is urged rearward,
A taper that moves in the front-rear direction integrally with the guide bush;
A guide bushing device comprising: a fixing member that is movable in the front-rear direction and biased rearward, and that engages with the taper in a state of moving rearward, thereby restricting forward movement of the guide bushing.   The fixed member includes a sphere sandwiched between an inner peripheral surface of the guide bush sleeve and the taper of the draw bar, and a cylindrical frame having a hole for accommodating the sphere. The guide bush device according to 1.   3. The guide bush device according to claim 1, wherein a rear end surface of the fixing member protrudes rearward from a rear end surface of the guide bush sleeve in a state where movement of the guide bush toward the front is restricted.   The rear end surface of the rear portion of the taper protrudes rearward from the rear end surface of the guide bush sleeve in a state where the fixing member restricts forward movement of the guide bush. The guide bush apparatus of any one of these.