JPH07314202A - Feed finger device for bar processing machine - Google Patents

Abstract

(57) [Summary] [Purpose] The feed finger of a bar processing machine that can easily perform the work of replacing the feed finger and the work of adjusting the clamping force of the bar, and that can reduce cost and save space. Provide a device. A feed bar is composed of a feed bar main body 15 driven by a feed mechanism, and a feed finger sleeve 24 which has a female taper portion 24a and is detachably coupled to a tip end portion of the feed bar main body 15. A feed finger unit 23 is formed between the finger 25 and the feed finger sleeve 24 by arranging a spring 26 for urging the feed finger sleeve 24 and the feed finger sleeve 24 so as to urge the feed finger 25 in the radial direction. The unit 23 can be attached to and detached from the tip of the feed bar body 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feed finger device for a bar processing machine in which bar materials are sequentially fed to a chuck by a bar material feeding mechanism.

[0002]

2. Description of the Related Art For example, in the case where a bar material is continuously processed into a large number of products by an automatic lathe, a feed finger device is provided so that the bar material is sequentially fed out after processing one product. This feed finger device clamps a bar material with a collet chuck to process a product, opens the collet chuck when one product is processed, and clamps the opened bar material with a feed finger to feed a predetermined amount. The collet chuck is made to protrude in front of the collet chuck, and in this state, the collet chuck is closed to clamp the bar. Such an operation is repeated to perform continuous machining.

As such a feed finger device,
Conventionally, there are various types, for example, Japanese Patent Publication No. 54-6293.
The following is proposed in Japanese Patent Publication (first conventional publication). When one product is processed and the collet chuck is released, the material feed cam rotates to move the feed guide pipe forward, and the feed finger is also urged by the urging force of the spring arranged at the rear portion of the guide pipe. Pushes and pushes the rod forward. Along with this operation, the automatic bar feeder feeds a predetermined amount of bar. When the collet chuck clamps the fed bar material, the material feeding cam further rotates, whereby the feed guide pipe moves rearward and the spring is compressed, and the feed finger returns to its original position.

When the rod becomes too short to be processed, the collet chuck is opened and the cylinder presses the nut fixed to the rear end of the feed tube through the swing member. Then, the feed tube pushes the feed finger forward to release the pinching of the bar. In this state, a new rod is inserted, and then the cylinder is released from operation, so that the feed finger holds the new rod.

Further, in Japanese Patent Laid-Open No. 2-232104 (second prior art), a guide bush (collet chuck) opening / closing mechanism, a rod feeding mechanism, and a chuck (feed finger) opening / closing mechanism are separately provided. Have been proposed.

[0006]

By the way, in the case of processing rods having different diameters in the feed finger device, the feed fingers are exchanged according to the diameters of the rods. However, in the above-mentioned first prior art publication, the collet chuck is removed, the material feed cam is rotated to move the feed guide pipe forward, and then the cylinder is operated to move the feed tube forward, thereby separating the tube and the feed finger. It is necessary to remove the feed finger in a state where the engaging portion is located forward from the feed guide pipe. Therefore, in order to replace the feed finger, a cylinder, a swing member, and the like are indispensable, and the number of parts is reduced accordingly. There is a problem that the mechanism becomes complicated by the increase.

In the above-mentioned second prior art publication, the collet nut, the guide bush, and the collet sleeve constituting the collet chuck mechanism are removed, or the drive portion of the working cylinder constituting the feed finger mechanism and the material feed table are separated from each other to make the spindle. Since the material feed shaft is pulled out from the rear end and the collet nut and the chuck are removed in this state, there is a problem in that the replacement work is troublesome, the workability is reduced, and the productivity is reduced.

Further, in the first prior art publication, since the nut for adjusting the holding force of the feed finger is located at the rear end of the main shaft, every time the feed finger is replaced,
It is necessary to adjust the gripping force of the feed finger, and in this case as well, replacement work is troublesome, and there is the same problem as described above.

Further, in the above-mentioned first prior art publication, a spring and a nut for urging the feed finger are arranged at the rear end of the feed guide pipe, and an opening / closing mechanism for the feed finger is arranged at the rear end of the main shaft. The second prior art publication has a structure in which the chuck opening / closing mechanism is arranged at the rear end of the main spindle, and both prior arts have a problem in that the entire main spindle becomes longer and space saving cannot be dealt with.

The present invention has been made in view of the above-mentioned conventional circumstances, and provides a feed finger device for a bar processing machine, which can improve the replacement work of the feed finger and can simplify the mechanism and save space. The purpose is to do.

[0011]

According to a first aspect of the present invention, there is provided a feed bar having a female taper portion on an inner peripheral surface of a hollow end which is arranged in a main spindle device having a chuck mechanism capable of holding a rod member. A feed finger having a hollow inside the feed bar and having a male taper portion fitted on the outer peripheral surface of the distal end portion to fit the female taper portion, and the feed bar and the feed finger are relatively moved in the axial direction of the main shaft. In the feed finger device of the bar processing machine, the feed finger device is provided with a feed mechanism that reduces the diameter of the tip of the feed finger to clamp the bar, and advances the feed finger together with the feed bar in the clamped state. And a feed bar main body driven by the feeding mechanism, and a feed tape having the female taper portion and detachably coupled to the tip end portion of the feed bar main body. The feed finger unit is formed by disposing a spring for biasing the feed finger sleeve and the feed finger in the radial direction of the feed finger so as to be coaxial with each other. It is characterized in that the finger unit can be attached to and detached from the tip of the feed bar body.

According to a second aspect of the invention, in the first aspect, an urging force adjusting means for adjusting the urging force of the spring is provided between the feed finger sleeve and the feed finger.

[0013]

According to the feed finger device of the present invention,
A feed finger unit is formed by inserting the feed finger into a feed finger sleeve that is removable from the feed bar body, and disposing a spring between the feed finger sleeve and the feed finger sleeve. Since it is detachable, when the feed finger is replaced, it can be easily replaced by simply removing the feed finger unit from the feed bar body as it is. (2) The workability can be improved and the mechanism can be simplified as compared with the case of removing the components of the collet chuck mechanism and the feed finger mechanism of the conventional publication.

Further, in the present invention, since the feed finger unit has a built-in spring, the holding force of the feed finger can be adjusted in advance for each feed finger unit. Therefore, the holding force is adjusted every time the feed finger unit is replaced. There is no need to do so, the workability when performing replacement work can be improved, and the conventional spring,
Compared to the case where a nut is separately provided behind the spindle, the entire spindle can be shortened, and space can be saved.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 are views for explaining a feed finger device of a bar processing machine according to an embodiment of the present invention. FIG. 1 is a sectional view of the device of the present embodiment, and FIG. Sectional views of the feed finger unit, FIGS. 3 and 4 are front and rear views of the feed finger unit, FIG. 5 is a sectional view showing replacement work of the feed finger unit, and FIGS. 6 to 7 are replacement work and adjustment work. This is the jig used. In this embodiment, the right end of each component in FIGS. 1 and 2 is called a front end or a front end, and the left end is called a rear end.

In FIG. 1, reference numeral 1 denotes a feed finger device of this embodiment, which comprises a main shaft 2 rotatably supported by a main shaft cylinder (not shown), and a collet chuck mechanism 3 mounted on the front part of the main shaft 2. A chuck cylinder 10 connected to the rear portion and a bar material supply mechanism 4 disposed at the rear end of the apparatus are provided.

The collet chuck mechanism 3 includes the spindle 2
The cylindrical chuck body 5 is fixed to the front end of the chuck body 5 with a ring-shaped chuck adapter 5b interposed therebetween, and a ring-shaped lid member 5a is detachably attached to the tip end surface of the chuck body 5. A cylindrical collet chuck sleeve 6 is inserted in the chuck body 5 so as to be slidable in the axial direction and non-rotatable relative to the chuck body 5. This collet chuck sleeve 6 is a chuck body 5
The amount of forward movement is regulated by the step portion 5d of the female taper portion 6d, and a female taper portion 6a that expands like a funnel is formed on the inner peripheral surface of the tip portion.
Are formed.

A collet chuck 7 is inserted in the collet chuck sleeve 6. A male taper portion 7a which fits into the female taper portion 6a is formed on the outer peripheral surface of the tip portion of the collet chuck 7, and the collet chuck 7 is moved forward by the inner peripheral edge 5c of the lid member 5a. Is regulated. The collet chuck 7 has a slit 7b extending axially rearward from the tip of the collet chuck 7.
Are formed at intervals in the circumferential direction, whereby the front portion of the collet chuck 7 can be expanded and contracted in the radial direction. Further, the collet chuck 7 is given an elastic force so as to expand outward from the contracted state shown in FIG.
That is, as shown in FIG. 2, when the collet chuck 7 is retracted to the left in the drawing in a state where the collet chuck 7 has a reduced diameter and holds the bar W, the collet chuck 7 moves to the bar W.
The elastic force causes the diameter to expand without receding due to the frictional force with.

A draw tube 8 is inserted in the main shaft 2, and a rear end portion of the collet chuck sleeve 6 is screwed into a front end portion of the draw tube 8. A pulley 9 is fixedly attached to the rear end of the main shaft 2, and the pulley 9 is connected to a rotary drive device via a belt (not shown) wound around the pulley 9.

A piston 10c of the chuck cylinder 10 for driving the collet chuck sleeve 6 forward and backward is connected to the rear end of the draw tube 8. The chuck cylinder 10 includes a rotary joint 10a that supplies pressure oil into the cylinder 10b, and a cylinder 11 through a bearing 11.
b, and a piston 10c is arranged in the cylinder 10b so that the piston 10c can move back and forth.
Is fixed in the rotation direction by a rotation preventing member (not shown) provided on the headstock. The piston 10c and the cylinder 10b are fixed in the rotational direction by a lock pin (not shown). The cylinder 10b is fixed to the main shaft 2 via a connection adapter 12 and a pulley 9.

The piston 10c is the cylinder 10b.
It is composed of a piston portion 13a that moves inside and a rod portion 13b that extends in the axial direction of the main shaft 2.
The rear end of the draw tube 8 is screwed into the front end of the rod tube 13b, and the rear end of the rod portion 13b is connected to the cylinder 10b.
Protruding from the rear.

When the rotary driving device drives the pulley 9 to rotate, the chuck body 5, the collet chuck sleeve 6, and the collet chuck 7 rotate via the main shaft 2, and the cylinder 10b, the piston 10c, and the draw tube 8 rotate. Rotate together.

When the piston 10c advances to the right in the figure, the collet chuck sleeve 6 advances via the draw tube 8, whereby the taper portion 7a of the collet chuck 7 presses and holds the bar W. Further, when the piston rod 10c is retracted, the collet chuck sleeve 6 is retracted, whereby the pressing of the collet chuck 7 is released and the rod W is released.

A feed bar (feed bar main body) 15 is inserted in the draw tube 8 of the main shaft 2,
The rod feeding mechanism (feeding mechanism) 4 is arranged at the rear end of the feed wheel 15. The rod feeding mechanism 4 has a structure in which a piston rod 17 of a finger cylinder 16 fixed to the headstock is connected to a rear end of the feed bar 15 via a connecting bracket 18 and a bearing block 19. The bearing block 19 has a structure in which a bearing 19c is interposed between a bearing case 19a and a bearing receiver 19b. The bearing case 19a is fixed to the connecting bracket 18.
The bearing receiver 19b is screwed onto the rear end of the feed bar 15.

A key groove 15a having a length corresponding to the feed amount of the bar W is formed at the rear portion of the feed bar 15, and the key 20a of the key block 20 is slidable in the key groove 15a. Is fitted to. The key block 20 is fixed to the rear end surface of the cylinder 10b, so that the feed bar 15 is fixed to the key block 2.
It is fixed to the cylinder 10b through 0 and is rotated together with the main shaft.

A feed finger unit 23, which is located inside the collet chuck sleeve 6 and is a feature of this embodiment, is arranged at the tip of the feed bar 15. The feed finger unit 23 is provided in a cylindrical feed finger sleeve 24 that is detachably screwed to the tip of the feed bar 15.
5 is slidably inserted, and a spring 26 is built in between the two. The feed finger sleeve 2
4 is a female taper portion 24a that spreads in a funnel shape on the inner peripheral surface of the tip portion of
The male taper portion 25a formed on the outer peripheral surface of the distal end portion of the feed finger 25 is fitted into the female taper portion 24a. And the above feed finger 2
5 has a slit 25 extending axially rearward from its tip.
b are formed at intervals in the circumferential direction, whereby the tip end portion of the feed finger 25 can be expanded and contracted in the radial direction. Further, an elastic force is applied to the tip end portion of the feed finger 25 so as to further expand the diameter outward from the diameter-reduced state shown in FIG.

A storage step portion 24b is formed on the inner peripheral surface of the feed finger sleeve 24, and the storage step portion 2 is formed.
The spring 26 is coaxially inserted between the inner peripheral surface of 4b and the outer peripheral surface of the feed finger 25. A stopper member (biasing force adjusting means) 27 is screwed to the rear end of the feed finger 25, and the spring 26 is in contact with the stopper member 27 in a compressed state. As a result, the feed finger 25 is urged to the reduced diameter state shown in FIG. Here, a stepped portion 24d formed on the outer peripheral surface of the feed finger sleeve 24 is formed with a T-shaped engagement groove 24c in a plan view for engaging a jig 31 (described later) when the feed finger unit 23 is removed. Further, a groove portion 27a is formed on the outer edge portion of the rear end surface of the stopper member 27 for engaging a jig 30 (described later) when adjusting the urging force of the spring 26.

Next, the function and effect of this embodiment will be described. When processing the bar W, the collet chuck mechanism 3 and the feed finger unit 23 are in the state shown in FIGS. 1 and 2 and hold the bar W therebetween. That is, the chuck cylinder 10
Of the piston 10c moves forward to move the collet chuck sleeve 6 forward, whereby the collet chuck 7 contracts to hold the bar W, and the feed finger unit 23
The feed finger 25 by the urging force of the spring 26 of
The feed finger sleeve 24 and the feed finger 25 are urged in the opposite directions in the opposite directions, and the feed finger 25 holds the bar W.

When the processing of the bar W is completed, a turret device (not shown) arranged in front of the feed finger device 1 (on the right side in the drawing) causes a stopper with a sensor provided for mounting the turret to the next bar W. Move to the position corresponding to the feeding length of.

At the same time, the finger cylinder 16
When the piston rod 17 of FIG. 1 projects leftward in the drawing, the feed finger sleeve 24 retracts leftward in the drawing. At this time, since the feed finger 25 holds the bar W, it stops at that position, so that the finger sleeve 2
4, the spring 26 is compressed as it retreats, and the feed finger 25 expands in diameter by its elastic force to release the pinching of the rod W, and the surface of the rod W slides as the piston rod 17 projects. While moving backward, the feed finger 25 moves backward by the stroke of the finger cylinder 16. Even in this state, the feed finger 25 holds the bar member with a relatively weak force by the urging force of the spring 26.

Next, the piston 10 of the chuck cylinder 10
c retreats to the left in the drawing, which causes the collet chuck 7
Does not retreat due to the presence of frictional force with the bar W, but opens due to its elastic force to release the pinching of the bar W. Then, when the piston rod 17 of the finger cylinder 16 starts to be retracted (advanced), the feed bar 15 starts to advance the feed finger sleeve 24. Then, the frictional force between the feed finger 25 and the bar W causes the feed finger 25 to advance. From the point of acting in the blocking direction and the point of application of the urging force of the spring 26, the feed finger 25 is further reduced in diameter to clamp the bar W more strongly. Further, when the piston rod 17 moves forward, the feed finger 25 holds the rod W and moves forward to feed it forward of the collet chuck 7. When it abuts against the stopper, a stop signal is output from the sensor and the piston rod 17 stops. In this state, the piston 10c advances and the collet chuck 7
Grips the bar W.

Then, the next product processing is started. Here, in the present embodiment, the feed finger 25 is not retracted in the above-described product processing and the bar W is held in between, but it may be retracted before the processing is started. Further, in these cases, it takes time because the feed finger 25 is retracted during non-product processing. Therefore, the feed finger 25 may be retracted while the product is processed.

In this way, when the rod W comes off the rod W when the rod W becomes shorter and the feed finger 25 is retracted in this manner, the rod will be moved to the tip of the rod 25 from the next time onward. Send out W. If the bar W does not come into contact with the stopper of the turret device even if the bar W further shortens and moves the maximum stroke amount of the piston rod 17, the reciprocating movement of the piston rod 17 is repeated only once, A control device (not shown) confirms that W does not come into contact with the stopper, and a known display device warns that machining cannot be performed. When this warning is displayed, the operator takes out the remaining material protruding from the collet chuck 7 and sets a new bar material in the bar feeder. Here, the above-mentioned warning may be displayed on the screen or may be displayed visually or audibly such as a buzzer.

Next, the work of replacing the feed fingers and the work of adjusting the clamping force will be described. 6 and 7 show
It is a figure which respectively shows the jig | tool used for the said exchange work and adjustment work.

FIG. 6A shows a jig 30 used for adjusting the urging force of the spring 26 of the feed finger unit 23. The jig 30 has convex portions 30b and 30b on the tip end surface of the cylindrical portion 30a. It has a structure in which a protrusion 30 is formed and a handle 30c is connected to the cylindrical portion 30a.

FIG. 6B shows a jig 31 used for removing the feed finger unit 23, which has a structure in which engaging projections 31b, 31b are formed in a protruding manner on the tip end surface of a cylindrical portion 31a. . In addition, this engaging protrusion 31b
The width of the engaging groove 24 of the feed finger sleeve 24 is
The width is set so that it can be inserted into c. Further, FIG. 7 shows a jig 33 for taking out the guide bush 32 of the bar W when the guide bush 32 for preventing the steady movement of the bar W is inserted in the feed bar 15, and a tip of the jig 33 has a hook shape. The engaging portion 33a is formed.

To replace the feed finger unit 23, the lid member 5a is removed from the chuck body 5 and the collet chuck 7 is removed, as shown in FIG. Then, the jig 31 is inserted from the front of the chuck body 5,
The engaging protrusion 31b of the jig 31 is engaged with the engaging groove 24c of the feed finger sleeve 24, and in this state, the handle 31c is rotated to remove the feed finger unit 23 together. In this case, the feed finger unit 2
It is also possible for 3 to hold the bar W. Next, when the guide bush 32 is inserted, the jig 33 is inserted and the guide bush 32 is pulled out. Then, another feed finger unit and a guide bush corresponding to the diameter of the rod are attached in the reverse order of the above, and then the collet chuck 7 and the lid member 5a are attached.

Next, in order to adjust the holding force of the feed finger 25, the feed finger unit 2 is adjusted by the above method.
3 is taken out, and the groove portion 2 of the stopper portion 27 on the rear end face thereof is taken out.
The convex portion 30b of the jig 30 is engaged with the stopper 7a.
The spring force is adjusted by rotating 7. Then insert the rod and check the clamping force. In this case, it is possible to make adjustments with the rod inserted. The clamping force can be inserted without inserting the rear end of the bar with an hammer when the bar is inserted into the feed finger unit 23, and the feed finger unit 23 can send out the bar without slipping. To adjust.

The protrusion 31b and the engaging groove 24c of the jig 31 do not have to be T-shaped, and may have the same shape as the protrusion of the jig 30.

As described above, according to this embodiment, the feed finger 25 is set in the feed finger sleeve 24, the spring 26 is arranged in the accommodation step portion 24b of the finger sleeve 24, and the feed finger 25 is Since the feed finger unit 23 is formed by inserting the stopper member 27 in the rear end portion so as to be able to move forward and backward, the lid member 5a and the collet chuck 7 are removed and the feed finger unit 23 is simply removed as described above. It is possible to replace the feed finger with time.

In this embodiment, the feed finger 25 is unitized and the spring 26 is provided in the unit.
Since the feed finger 25 and the feed finger sleeve 24 are built in so as to be coaxial with each other, the clamping force of the feed finger 25 can be adjusted in advance for each feed finger unit 23. Therefore, every time the feed finger unit 23 is replaced. Since it is not necessary to readjust it, the workability when exchanging work can be improved, and the axial length of the main shaft can be reduced, thus saving space.

Further, in the present embodiment, the feed finger unit 23 can be taken out from the front surface of the chuck body 5 by inserting a jig, so that the conventional device for forcibly opening the feed finger (feed) is used. The finger opening / closing mechanism) is not necessary, and the mechanism can be simplified also from this point.

[0043]

As described above, according to the feed finger device of the bar processing machine according to the present invention, the feed finger is inserted into the feed finger sleeve, and the inner peripheral surface of the feed finger sleeve and the outer circumference of the feed finger are arranged. Since a spring for urging the feed finger sleeve in the radial direction is arranged between it and the surface, there is an effect that the workability when replacing the feed finger can be improved, and that the mechanism can be simplified. There is.

Further, according to the invention of claim 2, since the biasing force adjusting means is arranged in the feed finger unit, there is an effect that the workability in the case of exchanging the feed finger can be further improved, and the space is saved. It has the effect of adapting to

[Brief description of drawings]

FIG. 1 is a sectional side view for explaining a feed finger device according to an embodiment of the present invention.

FIG. 2 is a sectional side view showing a feed finger unit of the apparatus of the above embodiment.

FIG. 3 is a front view of a feed finger unit of the apparatus of the above embodiment.

FIG. 4 is a rear view of the feed finger of the apparatus of the above embodiment.

FIG. 5 is a cross-sectional view showing a replacement operation of the feed finger unit of the apparatus of the above embodiment.

FIG. 6 is a view showing a jig adopted for a work for replacing a feed finger unit and a work for adjusting a clamping force in the apparatus of the above embodiment.

FIG. 7 is a view showing a jig adopted in the guide bush exchange work of the apparatus of the embodiment.

[Explanation of symbols]

 1 Feed Finger Device 3 Collet Chuck Mechanism 4 Bar Material Supply Mechanism 23 Feed Finger Unit 24 Feed Finger Sleeve 24a Female Tapered Part 24b Storage Step 25 Feed Finger 25a Male Tapered Part 26 Spring 27 Stopper Member (Biasing Force Adjusting Means) W Bar Material

Claims (2)

[Claims] 1. A feed bar having a hollow inside a spindle device equipped with a chuck mechanism capable of holding a rod and having a female taper portion on an inner peripheral surface of a tip portion, and a hollow arranged inside the feed bar. The feed finger having a male taper portion that fits the female taper portion on the outer peripheral surface of the tip portion, and the feed bar and the feed finger are relatively moved in the main shaft axial direction to reduce the diameter of the tip portion of the feed finger. A feed finger device of a bar processing machine, comprising: a feed mechanism for sandwiching a bar material with a feed bar and advancing the feed finger together with the feed bar in the sandwiched state; and a feed bar main body in which the feed bar is driven by the feed mechanism. And a feed finger sleeve that has the female taper portion and is detachably coupled to the tip end portion of the feed bar body. A feed finger unit is formed between the finger sleeve and the feed finger by arranging springs for urging the feed sleeve in the radial direction of the feed finger so as to be coaxial with each other. A feed finger device for a bar processing machine, which is detachably attached to the tip. 2. The feed finger device for a bar processing machine according to claim 1, wherein a biasing force adjusting means for adjusting a biasing force of a spring is provided between the feed finger sleeve and the feed finger. .