JPH0650081Y2 - Whirling prevention device for bars - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention, when the bar is fed from a bar feeder to a machine tool such as a lathe, supports the bar in a gap between them and prevents the whirling of the bar. Regarding a rotation prevention device.

[0002]

2. Description of the Related Art A bar feeder is designed to continuously feed an elongated bar to a machine tool such as a lathe.

That is, the rear end of a bar is gripped by a finger chuck and the finger chuck is moved toward a machine tool to feed the bar to a cutting tool such as a cutting tool by a predetermined length.

However, when the spindle of the machine tool moves in the direction of the center axis of the bar, the distance between the spindle and the tip of the bar feeder becomes large, the bar swirls, and abnormal vibration occurs. May cause

In order to prevent such whirling, conventionally, for example, as disclosed in Japanese Utility Model Laid-Open No. 3-68701, a holding pipe for passing a bar material between a bar material feeder and a movable main shaft is provided. Attempts have been made to provide them.

[0006]

However, since the above-mentioned conventional holding pipe is fixed to the main shaft, when the bar material feeder is installed on the machine tool installed in advance at a fixed position, the holding pipe is not attached to the holding pipe. Positioning is difficult.

If the holding pipe is attached to the spindle side, the structure of the spindle becomes complicated and the weight also increases. Further, the holding pipe slides in the bush on the side of the bar feeder with the movement of the main shaft, but since the holding pipe is fixed to the main shaft, due to the frictional resistance generated between the holding pipe and the bush, Unreasonable force may be applied to the bar feeder or machine tool.

[0008]

In order to solve the above-mentioned problems, the present invention provides a guide device for inserting a rod, which is inserted between the tip of a rod feeder and the spindle of a machine tool. A holding member for holding the guide device slidably in the central axis direction of the bar at the tip of the bar feeder, and the guide for elastically pressing the guide device toward the main shaft. The structure of a whirling prevention device for a bar material, which includes an expansion / contraction device interposed between the device and the holding member, is adopted.

[0009]

When the bar feeder is installed, the holding member allows the guide device to slide, and the expander / contractor elastically presses the guide device toward the spindle, so that the rod feeder and the moving spindle are joined. Will be easier.

The bar member rotates with the rotation of the main shaft, and the guide device surrounds the rotating bar member from around to prevent whirling. Also, the main axis moves in the direction of its central axis,
Since the telescopic device elastically presses the guide device toward the spindle, the guide device follows the spindle and always guides the bar properly. Even if a large force, vibration, or the like is applied to the guide device during the movement of the main shaft, the expansion device absorbs the force, so that it is possible to prevent an unreasonable force from being applied to the main shaft and the bar material feeder main body.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a whirling prevention device for a bar according to the present invention will be described below. Embodiment 1 As shown in FIG. 3, a bar feeder 1 is provided adjacent to a machine tool 2 such as a lathe.

The main body of the bar feeder 1 is a conventional product, and its outline will be described. The rod a is held at its rear end by a finger chuck at the front end of the feed pipe, and the feed pipe is driven by a chain to drive the rod. The material is sent to the machine tool in sequence.

The central axis of the main shaft 3 of the machine tool 2 is designed to coincide with the central axis of the bar a supplied by the bar feeder 1, and on the central axis only a predetermined stroke L ₁ is required. It can be moved back and forth. The main shaft 3 is provided with a chuck 4, and a bar a passing through the center of the main shaft 3 is gripped by the chuck 4 and rotated at a high speed. Further, the spindle 3
A tool (not shown) such as a cutting tool for processing the bar a is provided in front of the.

Between the tip 5 of the bar feeder 1 and the spindle 3 of the machine tool 2 is a bar a as shown in FIG.
The whirling prevention device 6 is provided. This whirling prevention device 6 is a guide device 7 through which a bar a inserted between a tip 5 of a bar feeder 1 and a spindle 3 of a machine tool 2 is inserted, and the guide device 7 is a bar. A holding member 8 for holding the tip end 5 of the rod material feeder 1 slidably in the central axis direction of the material a, and the guide for elastically pressing the guide device 7 toward the spindle 3. An expansion / contraction device 9 is provided between the device 7 and the holding member 8.

The guide device 7 has a cylindrical member 10 through which a rod a protruding from the main body of the rod feeder is inserted, and a surface of the rod a attached to the inner periphery of the tubular member 10. And a bush 11 that contacts with. The bush 11 guides the rotation of the bar a in a state where the central axes of the bush 11 and the center axis of the bush 3 coincide with each other, and prevents whirling of the bar a.

In place of the cylindrical member 10 and the bush 11, a group of rollers surrounding the rod a in a planetary shape may be used, or a plurality of endless belts holding the rod a may be used. it can.

The holding member 8 is a bracket for supporting the guide device 7 on the tip portion 5 of the bar feeder 1, and a block body 12 for slidably supporting the cylindrical member 10.
And a connector 13 for connecting and fixing the block body 12 to the main body of the bar material feeder 1.

The block body 12 is provided with a linear bearing 14 at a position in contact with the tubular member 10. Therefore, the guide device 7 can smoothly slide in the central axis direction. The expansion device 9 is composed of a gas spring. The gas spring has a structure as shown in FIG. 2, for example.
That is, the piston 1 is placed in the cylinder 15 filled with gas.
6 is inserted, the piston 16 is provided with an orifice 17, and the piston rod 18 penetrates through the seal 19 closing the cylinder end to the outside of the cylinder 15. Piston 1
6, the surface of the piston rod 18 has a smaller area than that of the surface on the opposite side, so that the surface of the piston 6 is constantly pushed toward the seal 19 with a substantially constant force. Therefore, the piston rod 1
8 always tries to protrude outside the cylinder 15.

As shown in FIG. 1, the rear end of the cylinder 15 of the gas spring is connected to the block body 12 of the holding member 8, and the tip of the piston rod 18 is connected to the tip of the tubular member 10 of the guide device 7. There is. For this reason, the tip of the tubular member 10 of the guide device 7 can elastically contact the spindle 3, and as the spindle 3 moves, it travels between the position indicated by the solid line and the position indicated by the chain double-dashed line. It can reciprocate by L ₂ . This stroke L ₂ is equal to the stroke L _{1 of the} spindle 3.

It should be noted that the cylinder 15 of the gas spring may not be filled with gas, and compressed air adjusted to a constant pressure by a pressure reducing valve may be constantly supplied. Next, the operation of the whirling prevention device 6 will be described.

When the bar feeder 1 is installed, the holding member 8 allows the guide device 7 to slide, and the telescopic device 9 elastically presses the guide device 7 toward the main shaft 3. Guide device 7
The tip of the tubular member 10 only contacts the end of the main shaft 3. Therefore, it becomes easy to join the bar feeder 1 and the main shaft 3.

When processing the bar a, the bar feeder 1 supplies the bar a toward the spindle 3 of the machine tool 2. The bar a reaches the main shaft 3 through the guide device 7, and the main shaft 3 grips and rotates the bar a to perform processing such as cutting with a cutting tool or the like. The guide device 7 surrounds the rotating bar a to prevent its whirling.

Although the main shaft 3 moves in the direction of its central axis, the expanding / contracting device 9 elastically presses the guide device 7 toward the main shaft 3, so that the guide device 7 follows the main shaft 3 and is always bar a. Guide the rotation of. Therefore, the bar a rotates on the central axis of the main shaft 3 without whirling.

Further, even if a large force or vibration is generated in the guide device 7 when the main shaft 3 moves, the expansion / contraction device 9 absorbs it. Therefore, it is possible to prevent an unreasonable force from being applied to the main shaft 3 and the main body of the bar material feeder 1.

Embodiment 2 As shown in FIGS. 4 and 5, this whirling prevention device 20 includes a tip portion 5 of a bar feeder 1 and a spindle 3 of a machine tool 2.
A guide device 21 through which a bar a inserted between
A holding member 22 for holding the guide device 21 slidably in the central axis direction of the bar a on the tip portion 5 of the bar feeder 1, and the guide device 21 toward the main shaft 3. The expansion / contraction device 23 is interposed between the guide device 21 for elastically pressing and the holding member 22.

The guide device 21 has a cylindrical member 24 having a through hole into which the rod a protruding from the main body of the rod feeder 1 is inserted, and the inner periphery of the through hole of the tubular member 24. And a bush 25 that comes into contact with the surface of the attached rod a. The bush 25 guides the rotation of the bar a in a state where the central axis coincides with the main shaft 3 and prevents whirling of the bar a.

Incidentally, as shown in FIG. 6, a ball bearing 30 may be provided between the cylindrical member 24 and the bush 25 to make the rotation of the bar a smoother. Further, instead of the tubular member 24 and the bush 25, the bar a
It is also possible to use a group of rollers that surround the circumference of the shaft like a planet, or to use a plurality of belts that sandwich the bar a.

The holding member 22 is a bracket for supporting the guide device 21 on the tip 5 of the bar feeder 1.
Block body 2 for slidably supporting the cylindrical member 24
6 and a connector 27 for connecting and fixing the block body 26 to the main body of the bar feeder 1.

The block body 26 is provided with a through hole 26a for passing the bar a in the center thereof, and a slide guide block 28 at the upper end. On the other hand, a slide rail 29 that engages with a slide guide block 28 is fixed to the tubular member 24 of the guide device 21. The guide directions of the slide guide block 28 and the slide rail 29 are parallel to the central axis of the bar a, so that the guide device 21 can make a sliding motion so that the central axis thereof coincides with the central axis of the bar a. it can.

The telescopic device 23 has the same structure as in the first embodiment, and the description thereof is omitted. Then, when processing the bar a, the bar a passes through the through hole 2 of the block 26.
6a and the bush 25 of the guide device 21 to reach the main shaft 3, the main shaft 3 grips and rotates the rod a, and performs processing such as cutting with a blade or the like. The guide device 21 surrounds the rotating rod a from the periphery and guides its rotation to prevent whirling.

Although the main shaft 3 moves in the direction of its central axis, the expansion / contraction device 23 elastically presses the guide device 21 toward the main shaft 3, so that the guide device 21 guides the slide guide block 28 and the slide rail 29. While being regulated, it follows the spindle 3 and constantly guides the rotation of the bar a. Therefore, the bar a rotates on the central axis of the main shaft 3 without whirling.

[0032]

EFFECT OF THE INVENTION The present invention has the above-mentioned structure. When the bar feeder is installed, the holding member allows the guide device to slide and the telescopic device elastically moves the guide device toward the main shaft. Can be pressed. Therefore, it is possible to easily and quickly join the rod material feeder and the movable spindle.

Further, since the guide device and the like are provided not on the main shaft side but on the bar material feeder side, the structure of the main shaft can be simplified and the weight can be reduced accordingly. Furthermore, the guide device can be elastically pressed toward the main shaft by the expansion / contraction device when the main shaft moves in the central axis direction. Therefore, the guide device can be made to follow the main shaft to always properly guide the rotation of the bar material and prevent whirling. Further, even if a large force or vibration is applied to the guide device during the movement of the main shaft, it can be absorbed by the telescopic device. Therefore, it is possible to prevent an unreasonable force from being applied to the main shaft or the bar feeder main body.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a whirling prevention device for a bar according to the present invention.

FIG. 2 is a vertical sectional view of a telescopic device in the whirling prevention device.

FIG. 3 is a front view showing the whirling prevention device together with a bar feeder and a machine tool.

FIG. 4 is a sectional view of another embodiment of the whirling prevention device for a bar according to the present invention.

5 is a left side view of the bar whirl-prevention device shown in FIG. 4. FIG.

FIG. 6 is a partially cutaway cross-sectional view showing another aspect of the guide device of the whirling prevention device for a bar material shown in FIG. 4.

[Explanation of symbols]

 a ... bar material 1 ... bar material feeder 2 ... machine tool 3 ... spindle 5 ... tip portion of bar material feeder 6 ... bar whirling prevention device 7 ... guide device 8 ... holding member 9 ... extension device

Claims (1)

[Scope of utility model registration request] 1. A guide device for guiding the rotation of a bar member, which is interposed between a tip end part of the bar material feeder and a spindle of a machine tool,
A holding member for holding the guide device slidably in the central axis direction of the bar at the tip of the bar feeder, and a guide device for elastically pressing the guide device toward the spindle. A whirling prevention device for a bar, comprising: an expansion / contraction device interposed between the holding member and the holding member.