JP3875944B2 - Bowling bar - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a boring bar used for finishing an inner peripheral surface of a machining hole having a relatively small diameter in machining.
[0002]
[Prior art]
Conventionally, there is a boring bar as a processing tool for finishing the inner peripheral surface of a relatively small diameter processing hole in machining. This boring bar has a head with a cutting tip at the tip, and this head is inserted into the machining hole, the boring bar is rotated, and the inner surface of the machining hole is finished with the tip attached to the tip of the head. ing.
[0003]
Further, in such a boring bar, a head having a tip is attached to the boring bar main body via an eccentric sleeve, and the head and the boring bar main body are fixed by a fixing screw.
When adjusting the radial direction when finishing the inner peripheral surface, the head is protruded from the boring bar main body to a position corresponding to a predetermined machining diameter, and then the position of the head is fixed by a fixing screw.
[0004]
[Problems to be solved by the invention]
In such a conventional boring bar, when adjusting the machining diameter, the head protrudes from the boring bar main body via an eccentric sleeve, and the position of the head is fixed with a fixing screw. For this reason, the amount of protrusion of the head changes when the head is fixed with a fixing screw after the head has been protruded by a predetermined amount due to the gap between the boring bar main body and the eccentric sleeve and between the eccentric sleeve and the head. There is a problem that it takes time to adjust the processing diameter by the boring bar.
[0005]
Therefore, in view of such a conventional problem, an object of the present invention is to provide a boring bar capable of easily setting a machining diameter.
[0006]
[Means for Solving the Problems]
The present invention provides a boring bar for processing an inner surface of an object, a cylindrical main body outer shell part, a head extension shaft in which one end is disposed inside the main body outer shell part, and a tip is attached to the other end. tuna tool support portion and an end portion of the main body outer shell portion from substantially the middle portion of the head extension shaft, near the end opposite to the side where the chip is mounted in the head extension shaft, the movement of the head extension shaft , and a regulation groove for regulating only in a predetermined direction perpendicular to the axis of the head extension axis, by operating the head extension shaft in the groove direction of the regulating groove, the support portion is attached to the end portion of the head extension axis elastically deformed The tip position can be adjusted.
[0007]
【The invention's effect】
According to the present invention, the head extension shaft and the main body outer shell portion are connected by the support portion, and the head extension shaft is swung while elastically deforming the support portion with a position corresponding to the support portion of the head extension shaft as a fulcrum. Therefore, the machining diameter can be easily adjusted without being affected by the influence of temperature change or the influence of the gap between the boring bar main body and the eccentric sleeve and the gap between the eccentric sleeve and the head because the eccentric sleeve is not used.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described by way of examples.
FIG. 1 is a cross-sectional view showing a configuration of an embodiment, and FIG. 2 is a perspective view of a main body portion of a boring bar. Further, FIG. 3 is a diagram showing an AA section in FIG. 1, and FIG. 4 is a diagram showing a BB section in FIG.
The main body 4 is constituted by the head extension shaft 2 having the head 7 at the end and the cylindrical main shell 3. The end of the head extension shaft 2 on the side not having the head portion 7 is disposed inside the main body portion 4 and extends from the substantially intermediate portion of the head extension shaft 2 continuously in the circumferential direction and outward. 6 and one end of the outer shell 3 are connected. The support portion 6 is formed to have a thickness that can be appropriately deformed and can be elastically deformed. The head extension shaft 2 is elastically deformed with the support portion 6 as a fulcrum at a position corresponding to the support portion 6, so that the main body portion 4 is deformed. On the other hand, it can swing .
[0009]
The other end of the main body outer shell 3 is opened, and a flange 18 that extends outward is formed at the opening edge. An inlay 29 formed by positioning the flange 18 and the flange portion 5 of the main body outer shell portion 3 with a positioning pin (not shown) and projecting from the center portion of the surface of the flange portion 5 on the side to which the main body outer shell portion 3 is attached. The flange 18 and the flange portion 5 are joined by a joining screw 20 that is fitted into the inner peripheral surface of the main body outer shell portion 3 and inserted from the flange 18 side.
The boring bar 1 is composed of the joined body portion 4 and flange portion 5.
[0010]
The side surface of the flange portion 5 on the side where the main body outer shell portion 3 is attached is formed at a position facing the end surface of the head extension shaft 2, in a direction perpendicular to the axis of the head extension shaft 2, and in parallel. A regulating groove 13 is formed. The head extension shaft 2 extends to the vicinity of the bottom of the restriction groove 13, and the two sides are formed in parallel by shaving on the side surface of the end of the head extension shaft 2 so as to engage with the restriction groove 13 formed in the flange portion 5. A width portion 12 is provided.
Further, the parallel width portion 12 of the head extension shaft 2 is slidable in the diameter direction of the head extension shaft 2 along the groove of the restriction groove 13 as shown in FIG.
[0011]
In the vicinity of the joint portion of the main body outer shell 3 and the head extension shaft 2 with the flange portion 5, a hole is drilled so as to pass through the axis of the head extension shaft 2 and be parallel to the groove direction of the restriction groove 13. A large diameter hole 14 and a small diameter hole 16 are formed respectively.
Further, a small diameter female screw 17 is formed on the inner surface of the small diameter hole 16.
[0012]
A cylindrical collar 11 is rotatably fitted in the large diameter hole 14, and a hole having a diameter larger than that of the small diameter hole 16 is formed in the collar 11. A large-diameter female screw 15 having a slightly different pitch from the small-diameter female screw 17 is formed on the inner peripheral surface of the hole formed in the collar 11. The length of the collar 11 in the axial direction is substantially equal to the thickness of the main body outer shell 3.
[0013]
An adjusting screw 9 having a large diameter portion 27 and a small diameter portion 28 is screwed into the hole of the collar 11 and the small diameter hole 16 of the head extension shaft 2. The axial length of the large-diameter portion 27 of the adjustment screw 9 is formed to be substantially equal to the thickness of the main body outer shell portion 3, and the large-diameter female screw 15 is engaged with the outer peripheral surface of the large-diameter portion 27 of the adjustment screw 9. A diameter male screw 25 is formed.
[0014]
The entire length of the adjusting screw 9 is slightly shorter than the length in the diametrical direction from the axis of the head extension shaft 2 to the outer periphery of the main body outer shell 3, and is formed on the outer peripheral surface of the small-diameter portion 28 of the adjusting screw 9. A small-diameter male screw 26 that engages with the small-diameter female screw 17 is formed.
[0015]
When attaching the adjusting screw 9 and the collar 11 to the large-diameter hole 14 and the small-diameter hole 16, first, the large-diameter portion 27 of the adjusting screw 9 is inserted into the hole of the collar 11, and the head surface of the adjusting screw 9 and the end surface of the collar 11 Screw in to align. Next, the small diameter portion 28 of the adjusting screw 9 is screwed into the small diameter hole 16 of the head extension shaft 2 and inserted. At this time, the collar 11 is inserted into the large-diameter hole 14 of the main body outer shell 3 while being rotated with the adjusting screw 9.
[0016]
Thereafter, it is confirmed that a tip 8 attached to the tip of the head portion 7 to be described later is a position where processing of a predetermined processing diameter can be performed, and the collar 11 is caulked with a method such as caulking of the main body outer shell portion 3. Secure to the large-diameter hole 14.
[0017]
A tip 8 for finishing the inner diameter of the machining hole is attached to the tip of the head portion 7. The tip 8 is attached to the head portion 7 in such a direction that the protruding direction of the blade edge is the same as the insertion direction of the adjusting screw 9.
[0018]
An inlay 24 is formed on the surface of the flange portion 5 opposite to the side to which the main body portion 4 is attached, in accordance with the fastening shape with the rotary main shaft 10 extending from a driving device (not shown). The boring bar 1 is attached to the rotation main shaft 10 by fixing the flange portion 5 and the rotation main shaft 10 with the attachment screw 21.
[0019]
An oil passage 22 is provided in the flange portion 5, and the cutting oil supplied from the rotary main shaft 10 is introduced into the boring bar 1. The cutting oil introduced into the boring bar 1 is supplied from the oil passage 22 to the oil passage 23 provided in the head portion 7 through the gap between the head extension shaft 2 and the main body outer shell portion 3, and the chip 8 is attached from the oil passage 23. Or the tip of the tip 8 is discharged.
[0020]
Next, a method for adjusting the machining diameter of the boring bar 1 will be described.
When the adjusting screw 9 is rotated to draw the end of the head extension shaft 2 on the parallel width portion 12 side upward in FIG. 1 (hereinafter, the vertical and horizontal directions will be described with reference to the direction of the reference numerals in the drawing). As shown in FIG. 7, while the movement direction of the head extension shaft 2 is restricted by the restriction groove 13 and the parallel width portion 12, the head extension shaft 2 moves to a position corresponding to the support portion 6 (near the point X in FIG. 7). the support portion 6 is swung is elastically deformed as a fulcrum (end on the side where the chip 8 of the head extension shaft 2 is mounted is moved to the lower side in FIG. 7).
On the other hand, when the adjusting screw 9 is rotated in the reverse direction and the end of the head extension shaft 2 on the parallel width portion 12 side is pushed downward in FIG. 1, the head extension shaft 2 elastically deforms the support portion 6 in FIG. (The end of the head extension shaft 2 on the side where the tip 8 is attached moves upward in FIG. 7).
In this way, the position of the tip 8 can be adjusted by rotating the adjustment screw 9 to swing the head extension shaft 2 .
[0021]
The adjustment amount obtained by rotating the adjustment screw 9 once is a pitch difference between the large-diameter female screw 15 and the small-diameter female screw 17 having different pitches, and can be finely adjusted more easily than the adjustment amount obtained with only one pitch. .
In this embodiment, the large-diameter female screw 15 and the small-diameter female screw 17 constitute a female screw having a different pitch in the present invention, and the large-diameter male screw 25 and the small-diameter male screw 26 in the present embodiment constitute a male screw having a different pitch in the present invention. .
[0022]
This embodiment is constructed as described above, the head extension shaft 2 and the main body outer shell 3 by connecting the support portion 6, by rotating the adjusting screw 9, the head extension shaft 2 corresponding to the support portion 6 While the support portion 6 is elastically deformed with the position (point X in FIG. 7) as a fulcrum, the head extension shaft 2 swings along the groove direction of the restriction groove 13 and the position of the chip 8 can be adjusted. This facilitates fine adjustment of the machining diameter of the boring bar 1.
Further, since the position of the tip 8 is adjusted by swinging the head extension shaft 2, the tip position does not change due to hysteresis after the position of the tip 8 is adjusted.
[0023]
By providing the large-diameter male screw 25 and the small-diameter male screw 26 having different pitches at both ends of the adjusting screw 9, the adjustment amount obtained by rotating the adjusting screw 9 once is the pitch difference between the large-diameter male screw 25 and the small-diameter male screw 26. Thus, fine adjustment of the position of the tip 8 is easier than the adjustment amount obtained by rotating the adjustment screw 9 once when the large-diameter male screw 25 and the small-diameter male screw 26 have the same pitch.
[0024]
Furthermore, since the tip 8 is directly attached to the head extension shaft 2 and the position of the tip 8 is adjusted by swinging the head extension shaft 2, the rigidity of the head extension shaft 2 can be increased, and the boring bar 1 can be used. There is no possibility that the head extension shaft 2 is broken during the processing of the hole.
[0025]
In the above embodiment, the cutting oil is discharged from the rotary spindle 10 to the chip 8 through the inside of the boring bar 1. However, the present invention is not limited to this, and the cutting oil discharge nozzle provided outside the boring bar 1 Cutting oil may be discharged.
[0026]
Moreover, in the said Example, although the shape of the flange part 5 of the boring bar 1 was set as the specification attached to an exclusive machine, as shown to FIG. 5, 6, flange part 5A which is an attachment part with the rotating main shaft in 1A of boring bars. Needless to say, by adopting a conical shape, it is possible to cope with an automatic tool changer such as a machining center.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment in the present invention.
FIG. 2 is a perspective view showing a main body portion of a boring bar.
FIG. 3 is a cross-sectional view taken along the line AA in FIG.
4 is a sectional view taken along line BB in FIG. 1. FIG.
FIG. 5 is a view showing a boring bar in which the shape of a flange portion is changed.
6 is a perspective view showing a boring bar in FIG. 5. FIG.
FIG. 7 is a diagram showing how the head extension shaft swings.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 1A Boring bar 2 Head extension shaft 3 Main body outer shell part 4 Main body part 5, 5A Flange part 6 Support part 7 Head part 8 Tip 9 Adjustment screw 10 Rotating spindle 11 Collar 12 Parallel width part 13 Restriction groove 15 Large diameter female screw 17 Small diameter female thread

Claims (2)

In a boring bar that processes the inner surface of an object,
A cylindrical outer shell,
A head extension shaft in which one end is disposed inside the outer shell portion and a chip is attached to the other end;
Tuna tool support portion from substantially the middle portion and an end portion of the main body outer shell portion of the head extension shaft,
A restriction groove for restricting movement of the head extension shaft only in a direction perpendicular to a predetermined axis of the head extension shaft, in the vicinity of the end of the head extension shaft opposite to the side on which the tip is attached;
Boring bar, characterized in that said head extension shaft by operating the groove direction of the restricting groove, the supporting portion is possible to adjust the chip position that is attached to the tip of the head extension shaft elastically deformed . Female heads having different pitches, which are penetrated coaxially in the same direction as the groove direction of the restriction groove, in the head extension shaft and the main body outer shell portion in the vicinity of the restriction groove,
An adjusting screw having male screws at different ends engaging with the female screw at both ends;
The tip position of the tip of the head extension shaft can be adjusted by deforming the support portion by engaging the adjustment screw with the female screw and rotating the adjustment screw. The boring bar according to 1.

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