JP3386601B2 - Boring bar end support device for boring machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boring bar end supporting device for a boring machine. 2. Description of the Related Art Conventionally, as a supporting device for rotatably supporting a free end of a boring bar (boring bar) of a horizontal boring machine (horizontal boring machine), for example, as shown in FIG. There is something. In this support device 51, a cylindrical holder 53 is rotatably disposed on a bearing frame 52, and a boring bar receiver 54 which is bolted is provided in the holder 53. The holder 54 and the boring bar receiver 54 A plug 57 having a positioning pin 56 is provided in the support holes 55a and 55b formed in the shaft core so as to be able to protrude and retract, and the plug 57 is connected to an operating rod 59 of a cylinder 58.
It is configured to be extruded in the protruding direction. For this reason, an engaging pin 60 is coaxially supported in the rear end of the plug 57, and the distal end of the operating rod 59 abuts the concave surface of the engaging pin 60, so that these plugs 57 and The operating rod 59 of the cylinder 58 is connected to each other. The plug 57 has a guide pin 61 penetrating in the vertical direction.
3a is inserted into the long hole 62 so that it can move within a certain range only in the axial direction with respect to the holder 53 and the boring bar receiver 54. In such a supporting device 51, a pin hole (not shown) at a free end of a boring bar of a boring machine is fitted into a positioning pin 56 of a plug 57 located at a position shown by a chain line, and a holder 53 and a The boring bar receiver 54 and a boring bar (not shown) are integrally engaged in the rotation direction, the boring bar is fitted into the support hole 55b of the boring bar receiver 54, and the boring bar is advanced to the solid line position of the plug 57 while rotating. Perform boring. After the work is completed, the plug 57 is pushed out in the protruding direction by the operating rod 59 of the cylinder 58 and moves rightward to the original position indicated by the dashed line. The support holes 55a and 55b of the receiver 54 are prevented from entering. However, in the above-described conventional support device 51, the plug 57 and the cylinder 5
8 is connected via the engagement pin 60 and the operating rod 59, the bearing 63 at the connection portion may be rusted by cutting oil or the like and may be damaged. In addition, since the plug 57 and the cylinder 58 are arranged side by side along the axial direction, the combination of the two increases the overall length, resulting in an increase in the size of the device.
In addition, since the conventional support device 51 is provided on a movable portion on the table 64, the accuracy of the movable portion affects the processing accuracy of the boring machine, and stable accuracy cannot be obtained. The present invention has been made in view of such circumstances, and has as its object to eliminate the possibility of breakage due to cutting oil and the like, shorten the overall length of the apparatus, and stabilize machining accuracy. It is an object of the present invention to provide a boring bar end supporting device for a boring machine which can be achieved. [0007] In order to solve the problems of the prior art, according to the present invention, a free end of a boring bar is provided on a side opposite to a spindle head with respect to a work jig. In a boring bar end support device of a boring machine that rotatably supports a cylindrical holder, a cylindrical holder is rotatably disposed on a bearing frame attached to the work jig side, and is integrally formed in the holder. provided with a boring bar bearing which is fixed, it said boring bar bearing axis of forming a support hole for inserting the free end of the bow <br/> ring bar, tip the boring bar and engages into the support hole the plug coupling freely fit arrangement infested, biases the plug to the projecting direction by the air pressure supplied to the support hole of the receiving the boring bar,
While the plug is configured so as to protrude from the support hole of the receiving the boring bar by the air pressure, the baud
One end can be moved to the above holder in the support hole of the ring bar receiver
A shaft attached to the
The other end of the plug is eccentrically connected to the axis of the plug,
Rotate the plug into the support hole of the boring bar receiver
Connect the plug and the boring bar
And use the boring bar to remove the plug from the air
In the support hole of the boring bar receiver against the urging force of the pressure
When the above boring bar is made rotatable,
The turning force of the boring bar is
The holder and the boring bar receiving
It is configured to transmit to the public. In the boring bar end support device of the boring machine according to the present invention, a cylindrical holder is rotatably disposed on a bearing frame attached to a work jig side, and the cylindrical holder is provided in the holder. provided with a boring bar bearing which is integrally fixed to form a support hole for inserting the free end of the boring bar in the axis of receiving the boring bar, the distal end portion into the support hole is engaged with said boring bar plug and freely fitted arranged infested with, the plug urges the projecting direction by the air pressure supplied to the support hole of the receiving the boring bar, the plug protrudes from the support hole of the receiving the boring bar by the air pressure While configuring the above boring bar
One end of the holder is movably attached to the holder.
And place the other end of the shaft up.
Connect the plug eccentrically from the axis of the plug, and lift the plug
It is connected to the support hole of
Engage the plug with the boring bar and
The above-mentioned plug is biased by the above-mentioned air pressure by the ring bar.
Push into the support hole of the boring bar receiver in opposition,
When the boring bar is rotatable, the boring
The rotational force of the guba is transmitted through the plug and the shaft.
To the holder and the boring bar receiver
As a result, there is no possibility that chips or the like may enter the support hole of the boring bar receiver, and the boring bar receiver has a built-in air cylinder that pushes out the plug, which is necessary for the conventional supporting device. In addition to eliminating the extrusion cylinder, the overall length of the apparatus can be shortened, and it is possible to eliminate damaged parts, such as bearings, used for a connection portion with the cylinder. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIGS. 1 and 2 show an embodiment of a boring bar end supporting device of a boring machine according to the present invention. In the drawing, reference numeral 1 denotes a horizontal boring machine in which a boring bar 2 is horizontally arranged, and the boring machine 1 includes a spindle head 3, a bed 4, a work jig 5, a boring bar end support device 6, and the like. ing. The boring bar 2 is rotatably attached to the spindle head 3, and a cutting tool 7 for boring a work (not shown) is provided on an outer peripheral surface of the boring bar 2. The boring bar end supporting device 6 rotatably supports the free end 2 a of the boring bar 2, and is disposed on the opposite side of the spindle head 3 with respect to the work jig 5. Therefore, the support device 6 has a bearing frame 8 whose lower end is attached to the side surface of the work jig 5.
The upper part of the bearing frame 8 is formed in a cylindrical shape which is disposed sideways. In the upper part of the bearing frame 8, as shown in FIG.
11 and is rotatably supported by the holder 9.
Is held between bearings 10 and 11 by a right end flange portion 9a and a lock nut 13 with a washer 12 interposed therebetween. Therefore, on the outer peripheral surface of the holder 9 near the left end small-diameter portion 9b, a screw portion 9 screwed with the lock nut 13 is provided.
c is formed. A large-diameter cap 14 and a cover member 15 are mounted on both left and right sides of the bearing frame 8 by tightening bolts 16 and 17, respectively.
Thus, the left and right openings 8a and 8b are closed. The large diameter cap 14 and the cover member 15 are provided with through holes 18, 19, and the small diameter portion 9 b of the holder 9 is inserted through the through hole 18 of the large diameter cap 14. Through hole 19
The boring bar 2 and a plug, which will be described later, are inserted and arranged therein. In addition, a pair of left and right bearings 1
Two large and small spacers 20 and 21 are disposed between 0 and 11. The left-side opening 9d of the holder 9 is closed by a small-diameter cap 23 fixed by a tightening bolt 22, and a boring bar receiver 24 constituting a built-in air cylinder is provided therein. . The right end of the boring bar receiver 24 has a flange portion 24.
a is formed, and the flange portion 24 a is attached to the holder 9.
And is integrally fixed to the holder 9 by overlapping with the flange portion 9a and bolting. Moreover, the axis C ₁ of the boring bar bearing 24, is formed a support hole 25 for inserting the free end 2a of the boring bar 2, whereby the boring bar bearing 24 is cylindrical. The support hole 25 of the boring bar receiver 24
, A cylindrical plug 26 is fitted and disposed so as to be freely retractable. A positioning pin 27 having a protruding distal end is provided at a distal end portion 26 a of the plug 26. A pin hole 28 of the boring bar 2 is fitted into the distal end of the positioning pin 27, and the boring bar 2 and the plug 26 are inserted. And are integrally engaged. Therefore, the pin hole 28 has a size corresponding to that of the positioning pin 27 and is formed on the distal end surface of the free end 2 a of the boring bar 2. The support hole 2 of the boring bar receiver 24
5 has a small-diameter cap 2 on one end (left end) 29a side.
A shaft 29 movably attached to the small-diameter portion 9b of the holder 9 through the shaft 3 is inserted and disposed. That is, one end 29a of the shaft 29 is
The shaft is rotatably and rotatably supported along the axial direction. In addition, a cap-shaped stopper 31 is attached to one end 29a of the shaft 29 by a bolt 30. The stopper 31 is used when the small-diameter cap 23 is not used.
To come into contact with. Further, the stopper 31
Is arranged so as to be able to engage with a detent block 32 which is a detent of the holder 9, and when the stopper 31 comes off from the detent block 32, the holder 9 becomes rotatable and the stopper 31 engages with the detent block 32. Then, the rotation of the holder 9 is prevented via the small-diameter cap 23. In FIG. 2, the portion of the stopper 31 that contacts the rotation preventing block 32 is formed in a straight line shape with a circle cut. The detent block 32 is fastened and fixed to the large diameter cap 14. On the other hand, the other end 29b of the shaft 29
Is attached to the plug 26 by a tightening bolt 33 in a state where it is inserted, and the plug 26 and the shaft 29 are integrally connected at a position C ₂ eccentric from the axis C ₁ of the boring bar receiver 24. Have been. Further, the boring bar 24 and the plug 26 are concentric, so that only the shaft 29 is eccentric. The rear end 26b of the plug 26 is provided with a fitting hole 34 into which the other end 29b of the shaft 29 is inserted. Thus, the rotating force of the boring bar 2 is configured to be transmitted to the holder 9 and the boring bar receiver 24 via the positioning pin 27, the plug 26, the shaft 29, and the like. Further, air pressure is supplied into the support hole 25 of the boring bar receiver 24 from an air supply source (not shown).
The plug 26 is configured to be urged in the protruding direction by the air pressure. For this reason, air passages 35, 36, and 37 communicating with each other are formed in the large-diameter cap 14, the small-diameter portion 9 b of the holder 9, and the small-diameter cap 23 in the radial direction, and the air passage 37 is formed in the small-diameter cap 23. Recess 3
The air supply source (not shown) communicates with the support hole 25 of the boring bar receiver 24 through the air passages 35, 36, 37 and the recess 38. Therefore, the plug 26 does not have the free end 2a of the boring bar 2 inserted into the support hole 25 of the boring bar receiver 24 (the state shown in FIG. 2).
The tip portion 26a is configured to protrude outside from the support hole 25 of the boring bar receiver 24 by the supplied air pressure. When the plug 26 is pushed by the boring bar 2 in a state where the plug 26 is engaged with the free end 2a of the boring bar 2, as shown by a chain line in FIG. Is moved leftward together with the shaft 29. A pressure reducing valve (not shown) is provided in the air pressure circuit. When the pressure of the plug 26 rises due to the action of the pressure reducing valve, the air escapes to the atmosphere and can be reduced in pressure. I have. To boring a work (not shown) with the boring machine 1 using the boring bar end support device 6 of the present embodiment, first, a support hole of a boring bar receiver 24 constituting an air cylinder. An air pressure is supplied into the work 25, and a work (not shown) is set on the work jig 5. Thereafter, the hole to be processed by moving the work is fitted to the boring bar 2. Then, by inserting the pin hole 28 of the free end 2 a of the boring bar 2 into the positioning pin 27 of the plug 26, the boring bar 2 and the plug 26 are integrally engaged. At this time, the positioning of the boring bar 2 in the rotation direction is performed by the positioning pin 2.
7 and the pin hole 28. In this state, when the plug 26 is pushed in by the boring bar 2, the plug 26 receives the boring bar receiver 24 against the urging force of the air pressure acting in the direction opposite to the direction in which the boring bar 2 enters. It moves leftward in the support hole 25 together with the shaft 29, and stops at the position indicated by the chain line on the right side shown in FIG. At this time, the stopper 31 attached to the one end 29a of the shaft 29 is pressed by the boring bar 2 and detaches from the detent block 32, so that the rotation direction is not restricted. Therefore, the boring bar 2 becomes rotatable at this position, so that the boring bar 2 is moved forward while rotating to perform boring of a work (not shown). During this time, the rotating force of the boring bar 2 is reduced by the positioning pin 27, the plug 26, the shaft 29, and the small-diameter cap 2.
Since the transmission is transmitted to the holder 9 and the boring bar receiver 24 through 3, the holder 9 and the boring bar receiver 24 rotate, whereby the boring bar 2 is supported by the support holes 25 of the boring bar receiver 24. . When the plug 26 moves leftward to the position indicated by the dashed line on the left side in FIG. 2, the rotation of the boring bar 2 is stopped, and the boring bar 2 is electrically rotated and positioned. Is pulled out of the support hole 25 of the boring bar receiver 24. At this time, since the air pressure acts on the plug 26 in the protruding direction, the plug 26 also moves in the same direction following the boring bar 2 removing operation, and the original protruding from the support hole 25 of the boring bar receiver 24. Then, the boring operation of the work is completed (see FIG. 2). In the boring bar end supporting device 6 of the present embodiment, the shaft 2 is inserted into the supporting hole 25 of the boring bar receiver 24.
9, and one end 29 a thereof is movably attached to the small-diameter portion 9 b of the holder 9 via the small-diameter cap 23, and the other end 29 b of the shaft 29 is attached to the plug 26. A position C ₂ eccentric to the shaft 29 from the axis C ₁ of the boring bar receiver 24
, The rotational force of the boring bar 2 is applied to the positioning pin 27, the plug 26, and the shaft 29.
Can be reliably transmitted to the holder 9 and the boring bar receiver 24 via the like. The embodiment of the present invention has been described above.
The present invention is not limited to the embodiments described above, and various modifications and changes can be made based on the technical idea of the present invention. For example, in the embodiment described above, the positioning pin 27 is projected from the tip 26a of the plug 26, and the pin hole 28 is provided in the boring bar 2. Instead of these, the tip 26a of the plug 26 is replaced. The same operation and effect can be obtained by forming a convex portion on the boring bar and forming a concave portion on the boring bar 2 to be engaged with the convex portion. As described above, the boring bar end supporting device of the boring machine according to the present invention is disposed on the side opposite to the spindle head with respect to the work jig, and the free end of the boring bar is set. It is rotatably supported, and a cylindrical holder is rotatably arranged on a bearing frame attached to the work jig side,
A boring bar receiver fixed integrally with the holder is provided in the holder, and an axis of the boring bar receiver is
Forming a support hole for inserting the free end of the boring bar, the distal end portion into the support hole is fitted disposed retractably plug for engagement with said boring bar, the bow <br/> ring bar the plug The plug is urged in the projecting direction by the air pressure supplied to the support hole of the receiver, and the plug projects from the support hole of the boring bar receiver by the air pressure .
One end of the boring bar support hole into the holder
A movably mounted shaft is inserted through and arranged.
The other end of the shaft is connected eccentrically from the axis of the plug.
And turn the plug into the support hole of the boring bar receiver.
Rolled together to connect the plug and the boring bar
Engage and lift the plug with the boring bar
The above boring bar support is supported against the air pressure.
Push the boring bar into the hole so that the boring bar can rotate.
When the rotation of the boring bar is
The holder and the boring through the shaft
It is configured to transmit to the bar receiver . Therefore, according to the boring bar end support device of the present invention, chips and the like do not enter the support holes of the boring bar receiver, and there is no possibility of breakage or the like caused by cutting oil or the like. Can be reliably supported, and the durability can be improved. Also, the boring bar receiver pushes out the plug.
By constructing a storage air cylinder, it is not necessary to use a dedicated extrusion cylinder, which was necessary for the conventional support device, so that the overall length of the device can be shortened compared to the conventional one, and compactness can be achieved. Become. Furthermore, in the boring bar end support device of the present invention, since the bearing frame is fixed to the work jig side, stable processing accuracy can be obtained as compared with the case where the bearing frame is attached to the movable part.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a boring machine provided with a boring bar end support device according to one embodiment of the present invention. FIG. 2 is a sectional view showing a main part of the boring bar end support device. FIG. 3 is a sectional view showing a boring bar end support device of a conventional boring machine. [Description of Signs] 1 boring machine 2 boring bar 2a free end of boring bar 5 work jig 6 boring bar end support device 7 byte 8 bearing frame 9 holder 10, 11 bearing 13 lock nut 14 large diameter cap 15 cover member 16, 17 Tightening bolts 18, 19 Through hole 22 Tightening bolt 23 Small diameter cap 24 Boring bar receiver 25 Support hole 26 Plug 27 Positioning pin 28 Pin hole 29 Shaft 30 Bolt 31 Stopper 32 Detent block 33 Tightening bolt 34 Fitting Holes 35, 36, 37 Air passage 38 Recess

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B23B 47/00

Claims (1)

(57) [Claims 1] A boring bar end support of a boring machine which is disposed on a side opposite to a spindle head with respect to a work jig and rotatably supports a free end of a boring bar. In the apparatus, a cylindrical holder is rotatably disposed on a bearing frame attached to the work jig side, and a boring bar receiver fixed integrally with the holder is provided in the holder. the axis to form a support hole for inserting the free end of the boring bar, the distal end portion into the support hole is disposed fitted retractably plug for engagement with said boring bar, the plug receiving said boring bar urges the projecting direction by the air pressure supplied to the support hole, while the plug is configured so as to protrude from the support hole of the receiving the boring bar by the air pressure, the support of the receiving the boring bar To
A shaft whose one end is movably attached to the holder
The other end of the shaft is connected to the axis of the plug.
Connect the plug more eccentrically and connect the plug to the boring bar.
-Rotationally connected to the support hole of the receptacle,
Engage with the boring bar and
The plug against the biasing force of the air pressure.
Push into the support hole of the ring bar receiver and
When the bar is rotatable, the torque of the above boring bar
Through the plug and the shaft.
And a boring bar end supporting device for a boring machine, wherein the boring bar end supporting device is configured to transmit the boring bar to the boring bar receiver .