JPH0655306A - Bar material feed device for spindle movement type lathe - Google Patents

Abstract

PURPOSE:To prevent a bar material clamped by a spindle from deflecting when a bar material is machined, in a bar material feed device with a push bar for feeding the bar material to the spindle. CONSTITUTION:A bar material feed device is provided with an interlock mechanism 15 to interlock a push bar 8 for pushing the rear end of a bar material 4 so that the push bar is moved together with the movement of a head stock 2 and an electromagnetic clutch 20 to release its interlock. When a spindle 3 clamps the bar material 4 and moves for machining, the push bar 8 is moved together with the head stock 2 by the interlock mechanism 15 to eliminate a pressing force by the push bar 8 on the bar material 4 and prevent the bar material 4 from deflecting. Also, when the bar material 4 is moved to the spindle 2, an interlock of the push bar 8 to the head stock 2 is released to enable independent movement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bar feed device for feeding a material to be processed (hereinafter referred to as a bar) to a main shaft in a main shaft moving type lathe.

[0002]

2. Description of the Related Art Conventionally, in a spindle moving type lathe, a rod feeding device for feeding a rod to a spindle is provided behind a headstock. FIG. 2 is a plan view schematically showing a main shaft moving type lathe equipped with a conventional rod feeding device, 1 is a bed, and 2 is provided so as to be reciprocable in the ZZ direction with respect to the bed 1. The headstock 3 is a spindle provided on the headstock 2 and includes a clamping means such as a collet chuck for clamping the rod 4. Reference numeral 5 is a guide bush provided in front of the headstock 2 so as to guide the rod 4, 6 is a blade for machining the rod 4, and 7 is a rod provided behind the headstock 2. It is a sending device.

The rod feeding device 7 is arranged behind the main shaft 3 and feeds a guide (not shown) for guiding the rod 4 into the main shaft 3 and a rod inside the feeding guide. Four
A push rod 8 for pushing the rear end, a finger 9 rotatably attached to the tip of the push rod 8 for fitting and clamping the rear end of the rod 4, and a push rod driving device 10 for moving the push rod 8. And so on. The push rod drive device 10 includes a push rod 8
11 stretched along the moving position of the chain and sprockets 12A, 12B for hanging the chain 11
And a feed motor 13 such as a servo motor or a torque motor for driving one sprocket 12A, a chain connector 14 for connecting the push rod 8 to the chain 11, and the like.

Next, the operation of the above device will be described. When supplying a new bar material to the main shaft 3, the new bar material 4 is set on the delivery guide at the rear of the main shaft, and the delivery motor 13 is operated. As a result, the push rod 8 advances toward the headstock 2, the rear end of the rod 4 is clamped by the fingers 9, the push rod 8 is further advanced, and the rod 4 is inserted into the spindle 3. When the bar 4 penetrates the main shaft 3 and a predetermined length protrudes from the tip of the main shaft 3, the main shaft 3 clamps the bar 4 and the machining operation starts. That is, the main shaft 3 advances in the ZZ direction while rotating with the rod 4 clamped, and the tip end portion of the rod 4 is processed by the blade 6. At the time of this processing, the feed-out motor 13 constantly applies a pressing force in the direction toward the headstock 2 to the push rod 8 via the chain 11, and even when the rod 4 moves forward, the finger 9 moves the rod 9 from the finger 9. The rear end is kept in place. After finishing the predetermined processing for the tip of the bar 4 and separating the tip, the spindle 3
The rod 4 is released from the clamp and the push rod 8 advances the rod 4 with respect to the main shaft 3, or the tip of the rod 4 is cut by the blade 6
By moving the main spindle 3 rearward while restraining the main spindle 3 from moving forward, a predetermined amount of the bar 4 is attached to the tip side of the main spindle 3.
And then the bar is clamped by the main shaft 3 to start the next processing.

In this prior art example, the chain 11 and the feed motor 1 for driving the chain 11 to move the push rod 8 are moved.
3 is used, but a structure in which a rope or other rope is used instead of the chain 11 and a weight is used to drive the rope is also known (for example, Japanese Utility Model Publication No. 61-132).
No. 01).

[0006]

However, in any of the conventional configurations described above, the bar is clamped by the main shaft and the rear end of the bar is always fed out while the bar is being processed. The weight is pushing toward the main shaft side, which has been found to cause the following problems.
That is, during processing, the spindle that clamps the rod may move backward, but at that time, the rod that is being pushed to the spindle side by the feed motor or the weight is pushed back by the spindle, so that the rod that is rotating is bent. Occurs, the bar material violently emits noise, the bar material is scratched, and the accuracy of the product is adversely affected. This phenomenon becomes more remarkable as the material has a smaller diameter. Further, in the case of a small-diameter material having a small diameter of, for example, 1 to 5 mmφ, the rod material should be pushed toward the main spindle side by the feed motor or the weight not only when the main spindle is retracted but also in other cases. By
Same as above.

In order to solve the above-mentioned problem, when the main shaft clamps the bar material for processing, the operation of the feed motor or the weight is stopped so that no force is applied to the push bar. Can be considered. However, in this way, since the push rod stops, when the main shaft moves forward and the rod advances accordingly, the rear end of the rod comes off the finger of the push rod, and when the rod advances by the subsequent advance of the push rod. It may cause trouble and is not a satisfactory solution.

The present invention has been made in order to solve the above-mentioned conventional problems, and the deflection of the bar material is achieved even with respect to a fine material and also when the main shaft is retracted while the bar material is clamped. It is an object of the present invention to provide a bar feeding device that does not cause this.

[0009]

DISCLOSURE OF THE INVENTION The present invention, which has been made to achieve the above-mentioned object, is a push rod which is arranged at the rear of a headstock and is movably provided so as to be able to push a rod supplied to the main spindle. And a push rod driving device for moving the push rod, an interlocking mechanism for interlocking the push rod with the headstock so that the push rod moves together with the headstock, and a release for releasing the interlocking of the headstock with the push rod. A gist of the present invention is a bar-feeding device for a spindle-moving lathe having a mechanism.

[0010]

According to the present invention, when the rod is supplied to the main shaft, the push rod drive device moves the push rod forward so that the rod can be fed to the main shaft. On the other hand, when the spindle clamps the bar material for processing, the push rod is moved together with the headstock by connecting the push rod to the headstock by the interlocking mechanism, and the pressing force of the push rod on the bar material is increased. It does not work, the bar does not bend, and the rear end of the bar does not separate from the push bar. When it becomes necessary to move the rod and the spindle relatively,
The interlocking between the headstock and the push rod may be released by the release mechanism.

[0011]

1 is a schematic plan view of a spindle moving type lathe equipped with a bar feeding device according to a preferred embodiment of the present invention.
The same parts as those of the conventional example shown in FIG. That is, in FIG. 1, 1 is a bed, 2 is a headstock provided so as to be capable of reciprocating relative to the bed 1 in the Z-Z direction, and 3 is a spindle provided on the headstock and clamps a bar material. Clamping means such as a collet chuck is provided. 4 is a bar to be processed, 5 is in front of the headstock 2,
Guide bushes 6 provided to guide the rod 4,
Is a blade for processing the bar 4.

A bar material feeding device 7A for supplying a bar material 4 to the main shaft 3 is provided behind the headstock 2. The bar feeding device 7A is arranged behind the main shaft 3 and guides the bar 4 to be inserted into the main shaft 3, and a delivery guide (not shown) and a rear part of the bar 4 in the delivery guide. A push rod 8 for pushing the end and a finger 9 which is rotatably attached to the tip of the push rod 8 and which fits and clamps the rear end of the rod 4.
And a push rod driving device 10 for moving the push rod 8 and the like. The push rod driving device 10 has a chain 11 stretched along the moving position of the push rod 8 and a sprocket 12A for hanging the chain 11. 12B, a feed motor 13 such as a servo motor and a torque motor for driving one sprocket 12A, a chain connector 14 for connecting the push rod 8 to the chain 11, and the like.

The rod feeding device 7A further has an interlocking mechanism 15 for interlocking the push rod with the headstock so that the push rod moves together with the headstock. This interlocking mechanism 15
Connecting bar 16 attached to the headstock 2 and connecting bar 1
Chain 17 stretched along the vicinity of the tip of 6 and sprockets 18A and 18B for hanging the chain 17
And a chain connector 19 and the like for connecting the tip of the connecting bar 16 to the chain 17, and one sprocket 18A is connected to the sprocket 12A via an electromagnetic clutch 20. The sprocket 18A has the same pitch diameter as the sprocket 12A. Thus,
In the state where the electromagnetic clutch 20 is connected, when the headstock 2 moves, the movement of the headstock 2 causes the connecting bar 16 and the chain connector 1 to move.
9 to the chain 17, and then to the chain 11 via the sprocket 18A, the electromagnetic clutch 20, and the sprocket 12A, and the chain 11 moves in the same direction as the chain 17 at the same speed. Therefore, the push rod 8 connected to the chain 11 moves in the same direction at the same speed as the headstock 2, and therefore the headstock 2 and the push rod 8 move together. Further, since the rotation between the sprockets 12A and 18A is not transmitted when the electromagnetic clutch 20 is disengaged, both can rotate independently, and the movement of the headstock 2 is not transmitted to the push rod 8. The electromagnetic clutch 20 constitutes a release mechanism that releases the interlocking between the headstock and the push rod. Here, the distance between the sprockets 18A and 18B for hanging the chain 17 is set to at least the maximum movement amount of the headstock 2. In addition,
An interlock circuit is provided so that the delivery motor 13 is turned off when the electromagnetic clutch 20 is turned on (connected state).

Next, the operation of the main shaft moving type lathe provided with the rod feeding device 7A having the above construction will be described.

When supplying a new bar material to the main shaft 3, a new bar material 4 is set on a delivery guide (not shown) at the rear of the main shaft 3, as in the conventional case. Next, the electromagnetic clutch 2
In the state where 0 is cut, the feed motor 13 operates to move the push rod 8 forward toward the headstock 2, clamp the rear end of the rod 4 with the fingers 9, and move the push rod 8 forward. As a result, the rod 4 is inserted into the main shaft 3. When the rod 4 penetrates the main shaft 3 and a predetermined length protrudes from the tip of the main rod 3, the main rod 3 clamps the rod 4, and at the same time the feed motor 13 is de-energized and the electromagnetic clutch 20 is connected. It Then, the processing operation starts.

When the bar material is processed, the feed motor 13 is de-energized as described above, and the electromagnetic clutch 2
0 is connected. In this state, the main shaft 3 clamps the rod 4 and moves forward or backward in the Z-Z direction while rotating, and the tip portion of the rod 4 is processed by the blade 6. When the headstock 2 moves during this processing, the movement of the headstock 2 is made via the connecting bar 16 and the chain connector 19.
7 is transmitted to the chain 11 via the sprocket 18A, the electromagnetic clutch 20, and the sprocket 12A, and the chain 11 moves at the same speed and in the same direction as the chain 17. Therefore, the push rod 8 connected to the chain 11 moves, and eventually the push rod 8 moves in the same direction as the headstock 2 at the same speed. Thus, no matter how the headstock 2 is moved forward or backward, the pressing force of the push rod 8 does not act on the bar member 4, so that the bar member 4 does not bend even if it has a small diameter. Further, since the rod 4 and the push rod 8 move together, the finger 9 of the push rod 8 does not come off from the rear end of the rod 4.

Next, after the predetermined processing for the tip portion of the rod 4 is completed and the tip portion is separated, the clamp of the rod 4 by the main shaft 3 is released, and the electromagnetic clutch 20 is disengaged. Then, the feed motor 13 is operated to move the push rod 8 forward, and the push rod 8 moves the rod 4 forward with respect to the main shaft 3, or the push rod 8 pushes the rear end of the rod 4 and presses the rod 4.
The tip end is restrained by the blade 6 so as not to move forward, and the headstock 2 is moved rearward in this state, so that the rod member 4 having a predetermined length is projected to the tip end side of the spindle 3. Then spindle 3
The rod is clamped with, the feed motor 13 is deactivated, and the electromagnetic clutch 20 is turned on to start the next processing. When the tip of the rod 4 is restrained by the blade 6 and the rear end is pushed by the push rod 8, some deflection may occur in the rod 4 having an extremely small diameter, but this operation is extremely short and Since the bar 4 does not rotate, there is no problem.

After the rods 4 are processed one after another from the tip side, the remaining rods, that is, the remaining rods are discharged from the spindle 3 by any of the following methods. (1) With the electromagnetic clutch 20 turned off and the bar 4 clamped by the main shaft 3 is released, the push rod 8 is retracted, the rear end of the bar 4 is grasped by the fingers 9 and pulled out behind the main shaft. Then, it is manually ejected from the fingers 9. (2) With the electromagnetic clutch 20 turned off and the rod 3 clamped by the main shaft 3, the push rod 8 is retracted, and the finger 9 is removed from the rear end of the rod 4. Next, the finger 9 holds a new bar material, and while the clamp of the bar material by the main shaft 3 is released, the new bar material is fed into the main shaft 3, and the remaining material is pushed forward of the main shaft by the bar material. (3) When an auxiliary main shaft capable of clamping a rod is provided in front of the main shaft 3, the end of the rod is bitten by the auxiliary main shaft, and the rod is clamped by the main shaft 3 to release the auxiliary. The main shaft or the main shaft 3 is moved, and the bar is pulled out from the main shaft 3 to the front thereof.

Although the finger 9 is provided in front of the push rod 8 to clamp the rear end of the rod 4 in the above-described embodiment, the present invention is not limited to this case, and the push rod 8 is used after the rod 4. The structure may be such that the end is pushed directly. Further, in the above embodiment,
The case where the feed motor 13 is used as the mechanism for moving the push rod 8 has been described, but the present invention is not limited to this configuration, and the push rod 8 may be moved using a weight.

[0020]

As described above, according to the present invention, the interlocking mechanism for interlocking the push rod with the headstock and the interlocking operation of the headstock with the push rod so that the headstock and the push rod move together. Since a release mechanism is provided for releasing, when the spindle clamps the bar material for processing, the interlocking mechanism connects the push rod to the headstock so that the push rod moves together with the headstock. The pressing force of the push rod does not act on the material, and even if the diameter of the material is extremely small, the rotating material does not bend, and the rear end of the material does not separate from the pressure rod. Good processing is possible, and moreover,
When advancing the rod with respect to the spindle, by releasing the interlocking of the headstock and the push rod, the spindle and the push rod can be moved relative to each other, and the rod can be moved to a predetermined position with respect to the spindle without any trouble. It has the effect that it can be supplied.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a spindle moving type lathe equipped with a bar feeding device according to a preferred embodiment of the present invention.

FIG. 2 is a schematic plan view of a spindle moving type lathe equipped with a conventional bar feeding device.

[Explanation of symbols]

 1 bed 2 headstock 3 main spindle 4 bar material 5 guide bush 6 knife 7A bar material feeding device 8 push rod 9 finger 11 chain 12A, 12B sprocket 13 feed motor 15 interlocking mechanism 16 connecting bar 17 chain 18A, 18B sprocket 20 electromagnetic clutch

Claims (1)

[Claims] 1. A push rod arranged rearward of a headstock and provided so as to be movable so as to push a bar material supplied to the spindle, a push rod drive device for moving the push rod, and the headstock together. Bar material for a spindle-moving lathe, characterized in that it has an interlocking mechanism for interlocking the push rod with the headstock so that the pushrod moves, and a release mechanism for releasing the interlocking of the headstock and the pushrod. Sending device.