JPH0329522B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for supporting an intermediate position of a boring bar having multiple stages with different outer diameters.

Some types of boring bars are connected to the spindle head by a flexible shaft joint, fit into a rotary bushing, etc. during processing of a workpiece, and are rotatably supported by the rotary bushing. However, when this boring bar is pulled out from the rotary bush, it becomes unstable because it is in a so-called cantilevered state. This unstable state can be solved by supporting the middle part of the boring bar with an appropriate member.
This can be resolved. However, when the outer diameter of the boring bar differs in multiple steps in the axial direction, the height of the receiving member must be adjusted each time. Such adjustment operations are virtually impossible during feeding movements of the boring bar.

Additionally, there is a support device of this type described in Japanese Utility Model Application No. 57-166610, which raises and inverts the support of the boring bar in conjunction with the feeding movement of the boring bar, thereby controlling the supporting operation of the boring bar and The support release operation is performed. However, with this structure, since the receiver rotates, it can only be supported when standing up, and it is impossible to stably support the boring bar in any other rotating position. It cannot be applied as is to different types of boring bar support devices.

Therefore, an object of the present invention is to adjust the height of the receiving member to the outside diameter of the boring bar in relation to the feed movement of the boring bar, in order to support the intermediate position of a boring bar having different outside diameters in a plurality of stages. to automatically adjust according to changes in

Based on the above object, the present invention utilizes the feeding motion of a boring bar, converts the motion into a swinging motion using a cam mechanism, drives a parallel link mechanism by this swinging motion, and drives a receiving motion of the boring bar. The height of the part is automatically adjusted according to the change in the outside diameter of the boring bar, so that even parts with a large outside diameter or a small outside diameter of the boring bar are always stable on the same axis during the boring bar feed movement. We are making it possible for you to support us.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention will be specifically explained based on the Example shown in the figure.

First, FIG. 1 shows a boring machine 1 equipped with a support device 13 of the present invention. This boring machine 1 is
The bed 2 is constructed as the main structural part.
This bed 2 is located at approximately the center of the upper surface of the processing table 3.
The workpiece 4 is fixed in position by a rotary bushing 5 which can be moved to one side with the workpiece 4 in between, and a rotary bushing 6 which is fixed at the other position is supported. Face 7
This holds the feed table 8 in a state where it can move forward and backward. The feed table 8 rotatably supports a horizontal boring bar 10 by a spindle head 9, and is equipped with a motor 11 and a transmission 12 for driving the boring bar 10. This boring bar 10 has a plurality of different outer diameters in the longitudinal direction, but the rotary bush 5,
When the feed table 8 moves forward, it fits into the rotary bushes 5 and 6, and is driven by the motor 11 at the normal position while being supported by them. Perform boring process.

The support device 13 of the invention is then provided near the rotating bush 6 in a fixed position. Figures 2 and 3
The figure shows the support device 13. The support device 13 includes a shaft 14 as an interlocking member as a main part,
It is composed of a cam mechanism 15, a parallel link mechanism 16, and a receiver 17 for the boring bar 10. The shaft 14 is horizontally and rotatably supported by two supports 18 and 19 as fixed parts, and has a groove-shaped cam 20 formed along its circumferential surface in the longitudinal direction. This cam 20 constitutes a part of the cam mechanism 15, and the boring bar 1
Although they are aligned in the same generatrix direction in the same outer diameter section of 0, they are formed in a continuous step shape in response to changes in the outer diameter of the boring bar 10. Note that this shaft 14 has dogs 21 and 2 for detecting rotational position at one end.
2. The dogs 21 and 22 correspond to limit switches 23 and 24, respectively.
Further, the feed table 8 has a support 2 on its side.
This holding body 25 holds a cam follower 26 that is large enough to fit into the groove-shaped cam 20.
is rotatably supported. In this way, the cam 20 and the cam follower 26 are connected to the cam mechanism 15.
It consists of

Next, the parallel link mechanism 16 connects the two levers 2
7, 28, a support 29, and one pillar 18. The levers 27 and 28 are rotatably supported on the column 18 by a pair of vertical support shafts 30 and 30 in a parallel state, and the support 29 is parallel to a straight line passing through the support shafts 30 and 30. It is rotatably connected to the tip portions of the levers 27, 28 by a pair of pins 31, 31 in a vertical state, and holds a V-block shaped receiver 17 at its upper end portion. One lever 27 is extended and rotatably connected to one end of a connecting rod 32 by a pin 33. The connecting rod 32 is rotatably connected to the distal end of the arm 34 by a pin 33 in an adjustable manner. This arm 34
is attached to the shaft 14 with a key or the like in a non-rotating manner.

Next, the operation of the support device 13 will be explained.

As already mentioned, the bowling bar 10 is
When it is fitted into the rotary bushes 5 and 6, it is supported by them in the normal machining position.
However, as shown in FIG. 1, when the feed table 8 is retracted, the boring bar 10 is pulled out from the rotary bushes 5 and 6, so it is in a so-called cantilevered state by the spindle head 9. . In particular, when the boring bar 10 is connected to the rotating shaft inside the spindle head 9 by a flexible joint or the like, the tip portion of the boring bar 10 descends due to the deflection, and the rotary bush 5 , 6 no longer coincides with the center.

However, in order to prevent the boring bar 10 from descending, the support device 13 of the present invention supports the boring bar 10 while changing its height in accordance with changes in the outer diameter of the boring bar 10 near the rotating bush 6.
is supported. That is, when the feed table 8 moves backward, the cam follower 26 fits inside the cam 20 and rotates the shaft 14 by a necessary rotation angle. At this time, the arm 34 rotates the lever 27 via the connecting rod 32 and operates the parallel link mechanism 16. Due to this parallel movement of the parallel link mechanism 16, the support 24 is vertically displaced while remaining vertically, and the support 24 integrated with the support 24 is vertically displaced.
moves vertically in response to changes in the outer diameter of the boring bar 10, and always supports the boring bar 10 on the same axis. The illustrated example boring bar 10 has four different outer diameters;
Correspondingly, the cam 20 has four
It is continuous in the form of two steps. Of course this cam 2
The length 0 corresponds to the length of the boring bar 10 and the amount of retraction thereof. In this way, since the boring bar 10 is supported by the support device 13, it is not in a so-called cantilevered state and is not unstable, and is always held on the same axis, so that the feed table 8 It is fitted into the rotary bushes 5 and 6 without any problem during the forward movement of the rotary bushes 5 and 6.

In the above embodiment, the cam 20 is formed on the shaft 14 side, and the cam follower 26 is formed on the feed table 8 side.
are attached, but these attachment positions may be reversed from those in the embodiment. Further, in the above embodiment, the rotation of the shaft 14 is indirectly transmitted to the lever 27 using the connecting rod 32 and the arm 34, but the parallel link mechanism 16 and the arm 34
may be directly connected. Furthermore, the above embodiment is
One support device 13 is provided corresponding to one boring bar 10, but if a plurality of boring bars 10 are provided, these support devices 13 are provided corresponding to the number.

In the above embodiment, the support device 13 of the present invention is applied to the boring machine 1 as an example, but the use of the support device 13 of the present invention is of course not limited to the use of the boring machine 1.

In the present invention, the support device corresponds to the movement of the boring bar forward and backward, and supports the boring bar by automatically changing the height in the vertical direction according to changes in the outer diameter of the supporting part of the boring bar. Even during movement, it is always supported stably and centered on the correct axis, so no excessive external force is applied to the boring bar's drive system, and the height of the support is directly related to the forward and backward movement of the boring bar. This ensures that changes in the outside diameter of the boring bar and changes in the height of the support are synchronized.

[Brief explanation of the drawing]

FIG. 1 is a side view of a boring machine having a support device of the present invention, FIG. 2 is an enlarged front view of the support device of the present invention, and FIG. 3 is an enlarged side view of the support device. DESCRIPTION OF SYMBOLS 1... Boring machine, 2... Bed, 10... Boring bar, 13... Boring bar support device, 14... Shaft as interlocking member, 15... Cam mechanism, 16... Parallel link mechanism, 17 ……received,
18, 19... Support as a fixed part, 20... Cam, 24... Support, 26... Cam follower.

Claims (1)

[Claims] 1. In a device that supports a boring bar that has different outer diameters in multiple stages and is fed by a feed table, the boring bar is rotatably but immovably supported on an immovable fixed part near the side of the feed table. a cam mechanism consisting of an interlocking member, a cam provided on one of the interlocking member and the feed table to respond to changes in the outer diameter of the boring bar, and a cam follower provided on the other one to respond to the cam; It is characterized by comprising a parallel link mechanism connected to the interlocking member, a support that is vertically displaced by the parallel movement of the parallel link mechanism, and a receiver provided on the support to support the intermediate position of the boring bar. Support device for boring bar.