JP2018062035A - Gun drill machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constantly regulate swinging prevention of a gun drill in an equal position within a range of free zone to stabilize operation of the gun drill and achieve accurate deep hole processing, and develop a novel gun drill machine.SOLUTION: In a gun drill machine, a plurality of swing stop devices 6 are installed in a free zone Z between a chip box 3 and a moving spindle unit 2 so as to be movable in an axial direction of a gun drill 5. Each of the swing stop devices 6 is configured so as to be movable in an arrangement position that divides a free zone Z equally.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gun drill machine that performs deep hole machining on a workpiece, and particularly relates to an improvement of a gun drill machine that stabilizes the operation of the gun drill and achieves accurate deep hole machining.

As is well known, a gun drill machine that performs deep hole drilling on a workpiece is a mechanism in which a long gun drill with a special cross-sectional shape is driven to rotate and work in the workpiece to drill holes. A processing technique has been established if dimensions and the like can be handled by conventional methods (see, for example, Patent Document 1).
Incidentally, the deep hole processing means that a hole having a diameter of 20 times or more is formed.
On the other hand, when the required processing specifications are extremely strict, development of the entire apparatus and accumulation of a lot of know-how are required.
Specifically, as an example of the difficult processing requirement specification, it is assumed that the material is a relatively hard stainless steel workpiece, the processing dimension is 1 mm or less in diameter, and the hole length exceeds 200 mm.

In the case of such specifications, of course, the gun drill has a drilling diameter of 1 mm, and the total length is about 300 mm including the margin part not directly involved in drilling. In addition, the cross-sectional shape is a shape obtained by cutting a chip feed groove from the circular shape by approximately ¼ circumference, and is not a complete circular cross-sectional shape.
Therefore, it is extremely difficult to rotate this stably, and accurate machining cannot be performed. That is, as shown in FIG. 5A, even if the machining end side of the gun drill 5 'with the workpiece W is accurately regulated by the chip box 3', the gun drill 5 'is rotated at a high speed (for example, about 1600 rpm) in the middle thereof. ), The gun drill 5 'bends into a spindle shape and exhibits a state of skipping or ballooning.
This movement is also transmitted to the tip of the gun drill 5 ', affecting the machining accuracy, and in a severe case, the gun drill 5' may be broken.

For this reason, as shown in FIG. 5B, an anti-sway device 6 'for stabilizing the gun drill 5' through the gun drill 5 'has been arranged between the tip box 3' and the spindle unit 2 '. As shown in FIG. 5 (c), the anti-sway bush 63 'is moved by the spindle unit 2' in accordance with the movement of the spindle unit 2 ', and only moves in an extruded form from the base end side. As a result, the anti-sway of the gun drill 5' The position where the restriction is performed is not an equal position of the free zone Z range.
That is, in the state shown in FIG. 5 (b), the distance between the chuck 27 'and the steady bush 63', the distance between the steady bush 63 ', and the steady bush 63' and the gizmo seal 31 '. Even if the distance d0 is set to the same distance d0, the distance between the chuck 27 'and the most proximal steady rest bush 63' decreases with the movement of the spindle unit 2 '. This is different from the interval d0. Specifically, as shown in FIG. 5C, the base end side distance dx is shorter than the distance d0.
For this reason, although the gun drill 5 'is held, a complete steadying action cannot be expected.

JP2012-86312A

  The present invention has been made in view of such a background. The steady operation of the gun drill is always performed at an equal position in the free zone range, so that the operation of the gun drill is stabilized and an accurate deep hole is achieved. The technical challenge is to develop a new gun drill machine that can be processed.

  That is, the gun drill machine according to claim 1 is provided on a bed, a spindle unit that holds the gun drill and moves in a range from a moving start end to a moving end on the bed, and the moving end side of the spindle unit. A tip box that is rotatably supported and a work holder that is disposed adjacent to the tip box on the opposite side of the spindle unit. The tip of the gun drill held by the spindle unit is held from the tip box to the work holder. A gun drill machine that drills a deep hole in the workpiece by rotating the spindle in the spindle unit and moving the spindle unit forward, and between the tip box and the moving spindle unit. In the free zone The plurality of steady rest devices are provided so as to be movable in the axial direction of the gun drill, and each steady rest device is configured to move so as to be in an arrangement position that equally divides the free zone. It is.

  In addition to the above requirements, the gun drill machine according to claim 2 is characterized in that the steadying device includes a moving gantry and a steadying bush that is rotatably supported by the movable gantry and has a guide hole in the center. The gantry is configured to move on a linear rail provided along the moving direction of the spindle unit, and a ball screw mechanism is connected to the movable gantry. Are driven so as to be arranged at positions that equally divide the free zone.

Furthermore, in the gun drill machine according to claim 3, in addition to the above requirements, the tip box has a gun drill inserted into a drill hole in the gizmo seal and a drill hole in the drill bush, and a tip of the gun drill protruding from the drill hole in the drill bush is provided. A support bush is provided between the gizmo seal and the drill bush, and a gun drill is inserted into a drill hole formed in the support bush. It is characterized by being.
The above-described problems can be solved by using the configurations described in the claims.

  According to the first aspect of the present invention, the steady operation of the gun drill is always performed at an equal position in the free zone range, so that the operation of the gun drill can be stabilized and accurate deep hole machining can be achieved.

  According to the second aspect of the present invention, the plurality of steady rests can be arranged at positions that equally divide the free zone.

  According to the invention of claim 3, the operation of the gun drill can be further stabilized in the chip box, and accurate deep hole machining can be achieved.

It is the side view which shows the gun drill machine of this invention, and the perspective view which expands and shows a part thereof. It is a side view which expands and shows a part of a spindle unit, a chip box, and a work holder. It is a perspective view which shows a steadying apparatus. It is a side view which shows the mode of the deep hole processing to the workpiece | work by a gun drill machine in steps. It is a side view which shows the existing gun drill machine and steady rest apparatus.

The best mode of the present invention is as described in the following examples, but can be appropriately modified within the scope of the technical idea of the present invention.
In the following description, first, the configuration of the gun drill machine 1 of the present invention will be described, and then the operation mode of this apparatus will be described.

As shown in FIG. 1, the gun drill machine 1 of the present invention includes a bed B, a spindle unit 2 that holds a gun drill 5 and moves on the bed B from a movement start end to a movement end, and the movement of the spindle unit 2. A tip box 3 provided on the end side and rotatably supporting the gun drill 5 and a work holder 4 disposed adjacent to the tip box 3 on the side opposite to the spindle unit 2 are provided. .
With such a gun drill machine 1, the tip of the gun drill 5 held on the spindle unit 2 is brought to the workpiece W held on the work holder 4 from the tip box 3, and the rotation of the spindle 23 in the spindle unit 2 and the spindle The deep hole H is drilled in the workpiece W by the advance of the unit 2.
In the free zone Z between the tip box 3 and the moving spindle unit 2, a plurality of steady rests 6 are provided so as to be movable in the axial direction of the gun drill 5, and each steady rest 6 is free. It is configured to move so as to be an arrangement position that equally divides the zone Z.
Hereinafter, each element constituting the gun drill machine 1 will be described in detail.

First, as an example, the spindle unit 2 has the same configuration as that disclosed in Japanese Patent Application Laid-Open No. 2012-86312 “Gun Drill Machine” which is a patent application filed by the present applicant. Specifically, as shown in FIG. 2, a stator 21 and a rotor 22 are provided in a casing 20, and a spindle 23 in the rotor 22 is pivotally supported by a pair of bearings 24 provided opposite to both ends of the casing 20. Has been.
An oil hole 25 is formed so as to penetrate the center of the spindle 23 in the axial direction, and an oil supply pipe 26 is connected to one end of the spindle 23 and a chuck 27 is connected to the other end.
The spindle unit 2 configured in this way is configured to be able to move on the rail R2 laid on the bed B by a ball screw mechanism or the like (not shown) along the axial direction of the spindle 23. Is done.

Next, the tip box 3 is a device for rotatably supporting the distal end side of the gun drill 5 and collecting chips D generated from the workpiece W, and further a device for holding the workpiece W, It is fixedly installed between the spindle unit 2 and the work holder 4 on the bed B.
Specifically, as shown in FIG. 2, a chuck 35 is rotatably provided on one side of the casing 30, and a gizmo seal 31 is rotatably provided on the opposite side of the chuck 35. A drill bush 32 is rotatably provided between the gizmo seal 31. The gun drill 5 is inserted into the drill hole 31a in the gizmo seal 31 and the drill hole 32a in the drill bush 32, and the tip of the gun drill 5 protruding from the drill hole 32a acts on the workpiece W in contact with the drill bush 32. .
In this embodiment, a support bush 33 having a drill hole 33a is provided between the gizmo seal 31 and the drill bush 32, and the gun drill 5 is inserted into the drill hole 33a.

Next, the workpiece holder 4 is a device for holding the workpiece W processed by the gun drill machine 1 between the chip box 3 and, in this embodiment, the rotation direction of the gun drill 5 is defined as the rotation direction of the gun drill 5. It has the structure rotated on the opposite side.
Specifically, as shown in FIG. 2, a chuck 42 is provided for an output shaft of a relative rotation unit 41 that is appropriately combined with gears, and a motor M4 for driving the relative rotation unit 41 is provided. Made up.
Such a work holder 4 is arranged such that the chuck 42 is opposed to the chuck 35 in the chip box 3, and further, along the axial direction of the spindle 23 in the spindle unit 2, the bed B By moving on the rail R4 laid on the top, the distance between the chuck 42 and the chuck 35 can be adjusted, and the workpiece W having various lengths can be held.
In addition, as a form of the work holder 4, the thing of the structure set to a fixed state without rotating the workpiece | work W can also be taken.

Next, the gun drill 5 is a drill for performing deep hole processing (processing for forming a hole having a diameter of 20 times or more of the diameter). As an example of particularly difficult processing required specifications, the work W is a relatively hard stainless steel type. It is assumed that the deep hole H has a diameter of 1 mm or less and a hole length exceeding 200 mm can be processed.
In the case of such a specification, the total length of the gun drill 5 is about 300 mm including a margin portion not directly involved in drilling.
As shown in an enlarged view of FIG. 2, the gun drill 5 has a V-shaped groove 51 that is cut out from a circular shape by approximately 1/4 circumference, and is not a complete circular cross-sectional shape. .
One or a plurality of oil holes 52 are formed so as to penetrate the gun drill 5 in the axial direction.
In FIG. 2, the axial center of the oil hole 25 in the spindle 23 and the oil hole 52 in the gun drill 5 are shifted, but since the chuck 27 is interposed between them, the chuck 27 stores the cutting oil. By providing, the movement of the cutting oil from the oil hole 25 to the oil hole 52 is performed smoothly.

Next, the steady rest device 6 is a device for suppressing a state of a rope skipping phenomenon or a ballooning phenomenon that bends in a spindle shape with the high speed rotation of the gun drill 5 (for example, about 1600 rpm).
Specifically, as shown in FIG. 3, as an example of parallel arrangement, as shown in FIG. 3, a steady stop bush 63 having a guide hole 63 a at the center is rotated with a bearing 64 interposed between two support rods 61 and 62. The bearing 64 is fixed to the support rods 61 and 62 by holding frames 61a and 62a.
In order to distinguish each of the steady stop bushes 63, what is provided in the support rod 61 is referred to as a steady stop bush 631, and what is provided in the support rod 62 is referred to as a steady stop bush 632.
The support rod 61 and the support rod 62 are connected to a moving frame 66 and a moving frame 67 that move on the two linear rails 65, and are substantially the components of the moving frame 66 and the moving frame 67. It is the member which becomes.

Each of the movable frame 66 and the movable frame 67 can be positioned at a desired position on the linear rail 65 by an individual ball screw mechanism 68. A nut block provided in the movable frame 66 and the movable frame 67 is provided. The screw shaft 68b is screwed with the screw 68a, and these screw shafts 68b are rotationally driven by the stepping motors M61 and M62.
The linear rail 65 is laid on the side wall 60 erected on the bed B so as to be parallel to the rail R2 that is the track of the spindle unit 2.

  Further, as shown in FIG. 3B, the planar shape of the support rod 61 and the planar shape of the support rod 62 are different. Even when the slide block 65a having a large width is in contact, the steadying bush 631 and the steadying bush 632 can be brought close to each other.

  The gun drill machine 1 is provided with a control panel 8 for controlling the spindle unit 2, work holder 4, steady rest device 6 and the like.

The gun drill machine 1 of the present invention is configured as described above as an example, and the operation mode of this apparatus will be described below.
First, the gun drill 5 is mounted on the chuck 27 in the spindle unit 2, and the tip of the gun drill 5 is inserted into the guide holes 63a of the two steady stop bushes 63 in the steady rest device 6 (FIG. 4A).

Next, the spindle unit 2 is advanced, and the tip of the gun drill 5 is sequentially inserted into the drill hole 31a of the gizmo seal 31 in the tip box 3, the drill hole 33a of the support bush 33, and the drill hole 32a of the drill bush 32 (see FIG. 4 (b)).
At this time, the tip of the gun drill 5 is prevented from protruding from the drill bush 32. In this state, the gun drill 5 is exposed, that is, between the chuck 27 in the spindle unit 2 and the gizmo seal 31 in the chip box 3. The space is referred to as a free zone Z.
Further, at this time, the stepping motors M61 and M62 in the steadying device 6 are appropriately driven so that the steadying bush 631 is provided at a position where the gun drill 5 (free zone Z) exposed between the chuck 27 and the gizmo seal 31 is equally divided. The steady rest bush 632 is positioned.
That is, the distance between the chuck 27 and the steady bush 631, the distance between the steady bush 631 and the steady bush 632, and the distance between the steady bush 632 and the gizmo seal 31 are the same distance d1. To be.

  Next, the workpiece W is mounted on the chuck 35 in the chip box 3 and the chuck 42 in the workpiece holder 4. At this time, the workpiece holder 4 is appropriately moved on the rail R 4 to reliably chuck the workpiece W. The work holder 4 is fixed at that position (FIG. 4B).

Next, the motor M2 is driven to rotate the gun drill 5, and the spindle unit 2 is advanced to cause the tip of the gun drill 5 to protrude from the drill hole 32a of the drill bush 32 to the opposite side, thereby acting on the workpiece W and cutting. A deep hole H is drilled.
At this time, the relative rotation unit 41 is driven by the motor M4 in the work holder 4, and the work W is rotated in the opposite direction to the gun drill 5, thereby increasing the relative rotational speed of the gun drill 5 with respect to the work W, thereby deep holes. The drilling speed of H can be increased.

Eventually, as shown in FIG. 4 (d), the spindle unit 2 advances to the end of movement, and the drilling of the deep hole H by the gun drill 5 is completed, and the length of the free zone Z is Gradually shorten.
At this time, the stepping motors M61 and M62 are controlled at any time by the control panel 8, so that the steadying bush 631 and the steadying bush 632 always move in the free zone Z even in the intermediate state as shown in FIG. It will be located at the place to divide equally.
In other words, the distance between the chuck 27 and the steady bush 631, the distance between the steady bush 631 and the steady bush 632, and the distance between the steady bush 632 and the gizmo seal 31 are the same distance d2. It will be.
Since the steady stop bush 63 always moves in synchronism with the movement of the spindle unit 2 from the start of processing to the end of processing in this way, while maintaining an arrangement that equally divides the free zone Z, the gun drill 5 rotates at high speed. The rope skipping phenomenon or ballooning phenomenon that accompanies this is surely suppressed.

  When drilling the deep hole H by the gun drill 5, the cutting oil is supplied at a high pressure from the tip of the gun drill 5 through the oil supply pipe 26, the oil hole 25, and the oil hole 52. Is transferred back through the V-groove 51 by this cutting oil, eventually becomes free when it passes through the drill bush 32 in the chip box 3, flows down through the casing 30, and is recovered as appropriate. Filtered and recycled.

1 Gun drill machine

2 Spindle unit 20 Casing 21 Stator 22 Rotor 23 Spindle 24 Bearing 25 Oil hole 26 Oil supply pipe 27 Chuck

3 Chip Box 30 Casing 31 Gizmo Seal 31a Drill Hole 32 Drill Bush 32a Drill Hole 33 Support Bush 33a Drill Hole 35 Chuck

4 Work holder 41 Relative rotation unit 42 Chuck

5 Gun drill 51 V groove 52 Oil hole

6 Anti-sway device 60 Side wall 61 Support rod 61a Presser frame 62 Support rod 62a Presser frame 63 Anti-shake bush 63a Guide hole 631 Anti-shake bush 632 Anti-shake bush 64 Bearing 65 Linear rail 65a Slide block 66 Moving stand 67 Moving stand 67 Moving stand 68 Ball screw mechanism 68a Nut block 68b Screw shaft 8 Control panel

d0 interval d1 interval d2 interval dx interval B bed D chips H deep hole M2 motor M4 motor M61 stepping motor M62 stepping motor R2 rail R4 rail W work Z free zone

Claims (3)

Bed and
A spindle unit that holds a gun drill and moves in a range from a movement start end to a movement end on the bed;
A tip box provided on the moving terminal side of the spindle unit and rotatably supporting the gun drill;
A work holder disposed adjacent to the chip box on the opposite side of the spindle unit;
The tip of the gun drill held on the spindle unit is led to the work held on the work holder from the tip box,
A gun drill machine that drills a deep hole in the workpiece by rotating the spindle in the spindle unit and advancing the spindle unit.
In the free zone between the tip box and the moving spindle unit, a plurality of steady rest devices are provided to be movable in the axial direction of the gun drill,
Each of the steady rests is configured to move so as to have an arrangement position that equally divides the free zone.
The steady rest device comprises a movable gantry and a steady brace that is rotatably supported by the movable gantry and has a guide hole at its center.
The moving gantry is configured to move on a linear rail provided along the moving direction of the spindle unit,
A ball screw mechanism is connected to the movable base, and the plurality of steady rests are always driven by the rotation of the screw shaft so as to be arranged at positions that equally divide the free zone. The listed gun drill machine.
The tip box is configured such that a gun drill is inserted into a drill hole in the gizmo seal and a drill hole in the drill bush, and the tip of the gun drill protruding from the drill hole in the drill bush acts on the workpiece.
3. A support bush is provided between the gizmo seal and the drill bush, and a gun drill is inserted into a drill hole formed in the support bush. Gun drill machine.

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