JP2687064B2 - Bar material supply method and bar material supply control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rod feeding method and a rod feeding control device, and more particularly to a rod for continuously feeding a long rod to an automatic lathe by a rod feeding machine. The present invention relates to a material supply method and a bar material supply control device.

[0002]

2. Description of the Related Art There is known an automatic lathe configured to machine a plurality of products from a front end portion of a bar by turning a bar as a material according to a predetermined program. Also,
There is known a bar material feeder configured to supply the bar material to the automatic lathe continuously or automatically following the operation of the automatic lathe.

Generally, a bar feeder has a feed arrow for advancing the bar toward an automatic lathe, a feed arrow drive mechanism for advancing or retracting the feed arrow, and a controller for controlling the operation of the feed arrow drive mechanism. Is equipped with. The following two bar material supply methods have heretofore been used as a method for supplying a bar material to an automatic lathe with this kind of bar material supply device. (1) A finger chuck for gripping the rear end of the bar is provided at the front end of the feed arrow, and the feed arrow advances the bar while the rear end of the bar is gripped by the finger chuck.
When the automatic lathe cuts through the final product from the front end of the bar, the residual material called the end material is left on the spindle of the automatic lathe, but the feed arrow feeds the bar feed machine while holding the end material with the finger chuck. fall back. The residual material discharging mechanism of the bar material feeder separates this end material from the finger chuck and discharges it to the outside of the machine. According to this method, the mill ends can be brought back to the bar feeder and discharged. (2) The feed arrow pushes the bar at its front end face and advances it toward the automatic lathe. The end material is pushed forward of the main shaft at the front end face of the feed arrow or the new material, and is carried out of the lathe by a part catcher of an automatic lathe or a chip conveyor. According to this method, it is possible to separate the front end face of the feed rod from the rod during cutting of the rod and prevent the rotation of the rod from being transmitted to the feed arrow.

[0004]

[Problems to be solved by the invention]
Problems have been pointed out in recent years for the two methods. That is, (a) In the supply method in the above (1) (hereinafter referred to as a grip supply method), an outer diameter grip type finger chuck that grips the outer peripheral surface of the bar is generally used. The outer diameter is much larger than the outer diameter of the bar. Therefore, it may not be possible to insert the finger chuck into the main shaft internal pipe of the automatic lathe. Attempt to use an outer-diameter gripping finger chuck having an outer diameter equal to or less than the outer diameter of the rod, or an inner-diameter gripping type finger chuck that grips the inner circumference of the bore from the inside, in order to insert the finger chuck into the spindle inner tube. However, in order to grip the bar with such a finger chuck, special pre-processing such as cutting down or boring must be applied to the rear end of the bar. However, processing only one end of a long bar is an extremely inefficient work, and such processing is not widely used in practice. Therefore, the above gripping and feeding method has a problem that not only the bar material and the feed arrow cannot be isolated during machining, but also the feed arrow cannot be substantially inserted into the main spindle internal pipe. (B) On the other hand, in the supply method in (2) above (hereinafter referred to as the pressure supply method), the end material left on the spindle is extruded in front of the spindle and carried out with the product or chips to the outside of the lathe. Therefore, there is a case where a product that is precision processed with high precision is damaged or the chip conveyor is damaged. Such a problem becomes remarkable when the diameter of the rod is large and therefore a large amount of scrap material is discharged, and some solution has been particularly desired in recent years.

The present invention has been made in view of the above points, and an object of the present invention is to feed a long rod continuously to an automatic lathe by a feed arrow of a rod feeder. In the method, it is possible to use a finger chuck having an outer diameter smaller than the outer diameter of the bar material without performing special processing on the rear end portion of the bar material. It is to provide a method of supplying a bar material capable of preventing wear of the bar.

Further, in the present invention, in a bar material supply control device of an automatic bar material processing apparatus constituted by combining a bar material supply machine and an automatic lathe, the bar material supply method can be appropriately performed with a simple structure. An object of the present invention is to provide a bar material supply control device capable of

[0007]

In order to achieve the above object, the present invention provides a bar material supplying method for continuously supplying a long bar material to an automatic lathe by a feed arrow of a bar material feeder,
In order to supply the rod to the automatic lathe, a finger chuck having an outer diameter equal to or less than the outer diameter of the rod is brought into contact with the rear end surface of the rod, and the rod is pressed toward the automatic lathe by the feed arrow, When the total length of the bar material is shortened to become a scrap material, the scrap material is processed by an automatic lathe so that the scrap material can be gripped by the finger chuck, the feed arrow is advanced, and the scrap material is gripped by the finger chuck. Provided is a method for feeding a bar material, which is characterized by retracting a feed arrow.

According to the above configuration of the present invention, since the bar material can be supplied to the automatic lathe without holding the rear end of the bar material with the finger chuck of the feed arrow, the feed arrow can be fed during cutting of the bar material. The rotation of the bar can be prevented from being transmitted to the feed arrow by separating from the rear end. Further, the end material left on the automatic lathe at the completion of the work of the product is not discharged into the automatic lathe, but can be grasped by the finger chuck, brought back to the bar material feeder together with the feed arrow, and discharged at the bar material feeder side. Therefore, damage to the product and damage to the chip conveyor can be avoided.

The present invention also provides a bar material supply control device for an automatic bar material processing apparatus constructed by combining a bar material supply machine and an automatic lathe with a controller for controlling the operation of the bar material supply machine and the automatic lathe. First position detecting means for detecting that the feed arrow of the bar feeder has reached the most advanced position, and first position detecting means for detecting the position of the feed arrow when the bar in the automatic lathe becomes a scrap. When the second position detecting means detects that the bar material has become a scrap material, the controller has a two-position detecting means, and cuts the scrap material into a form that can be grasped by the finger chuck of the feed arrow. Cutting material for controlling the processing device of the automatic lathe so as to perform cutting, and advance the feed arrow until it is detected by the first position detection means that the feed arrow has reached the most advanced position, Best of sending arrow Providing bar feeding control apparatus characterized by having an end member gripping means for gripping the end material to the finger chuck advance position.

According to the bar material supply control device thus constructed, the mill ends are processed by the automatic lathe under the control of the mill ends processing means, and the fingers are operated in the lathe under the control of the mill ends holding means. The chuck can grip the scrap material.
Therefore, the automatic bar processing device supplies the bar to the automatic lathe by pressing it without gripping the rear end of the bar, and feeds the bar to the rear end of the bar during cutting of the bar. Can be separated from. Further, the scraps can be discharged by the stick material feeder side by grasping with a finger chuck and brought back to the stick material feeder together with the feed arrow without discharging the scrap material into the automatic lathe.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A bar feeding method according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a schematic plan view of an automatic bar material processing apparatus to which a bar material feeding method according to the present invention is applied.

As shown in FIG. 1, an automatic bar processing apparatus 1
Is substantially composed of a bar feeder 10 and an NC lathe 20 which are aligned along the machining axis XX of the bar. The bar material feeder 10 includes a frame 12 supported by the legs 11, 11 and a frame 1 movably along a machining axis XX.
2, and a feed arrow 13 supported by 2. Sending arrow 13
A finger chuck 14 for pressing the rear end of the bar W is attached to the front end of the. The finger chuck 14 is of a so-called outer diameter gripping type that grips the outer peripheral surface of the rod W inside the bore of the chuck, and has an outer diameter substantially equal to the outer diameter of the rod W. Therefore, the chuck inner diameter of the finger chuck 14 is larger than the outer diameter of the bar W,
The rear end of the bar W is not gripped. That is, the finger chuck 14 can only press the rear end of the bar W toward the NC lathe 20.

The bar material feeder 10 also includes a new material feeding mechanism and a feed arrow moving mechanism. New material supply mechanism (not shown)
Inserts a bar material to be newly processed, that is, a new material on the processing axis line XX in front of the feed arrow 13. Further, the feed arrow moving mechanism includes a chain 15, and is configured to push the feed arrow 13 toward the NC lathe 20 by transmitting a driving force to the chain 15. The bar material feeder 10 further includes a residual material discharging mechanism (not shown) for detaching the end material from the finger chuck 14 of the feed arrow 13 when the feed arrow 13 brings back the end material. The residual material discharging mechanism has a conventional structure and is provided with a residual material clamp for gripping an end material and detaching it from the finger chuck 14, and a residual material receiver for receiving the residual material released from the finger chuck 14.

The bar material feeder 10 serves as bar material supply control means, and a controller C1 for controlling the movement of the feed arrow 13,
Two position detection sensors LSA and LSB for detecting the position of the rear end of the feed arrow 13 are provided. The position detection sensor LSA arranged at the front end of the frame 12 is arranged adjacent to the stopper 19 that restricts the forward movement of the feed arrow 13, and the position detection sensor LSB is arranged behind the position detection sensor LSA by a predetermined distance. Has been done. Each sensor LSA, LS
B is connected to the controller C1, and the controller C1 is configured to control the operation of the feed arrow 13 based on the position of the feed arrow 13 detected by these sensors LSA and LSB.

The NC lathe 20 is configured as a so-called two-spindle type automatic lathe with a movable spindle.
Movable first spindle 21 provided with collet chuck 2
And a movable second spindle 25 provided with the second spindle 2.
5 is arranged in front of the first main shaft 21 so as to face the first main shaft 21. Between the first spindle 21 and the second spindle 25, a first bite 23 for the first spindle 21 and a second
A second bite 24 for the spindle 25 is provided.

The NC lathe 20 also controls the operations of the spindles 21 and 25 and the cutting tools 23 and 24 in order to cut the front end of the bar W and cut the product from the front end. And a sub-program for controlling the operation of the spindles 21, 25 and the cutting tools 23, 24 other than the time of manufacturing the product, for example, the operation of the spindles 21, 25 and the cutting tools 23, 24 when supplying a new material. Equipped with C2. This controller C2
Is a bar material supply control means, and is a bar material supply machine 10.
Is connected to the controller C1 and cooperates with the controller C1 to perform cooperative control between the bar material feeder 10 and the NC lathe 20.

FIG. 2 is a flow chart showing the control method of the automatic bar processing apparatus 1 by the controllers C1 and C2, and FIG. 3 is an explanatory view showing the final stage of the turning process in the automatic bar processing apparatus 1. is there. The operation of the automatic bar material processing apparatus 1 will be described with reference to FIGS. 2 and 3.
The bar to be newly processed is fed by the new material feeding mechanism 1
When it is thrown in on the machining axis line XX in front of 3, the feed arrow is moved forward by the feed arrow moving mechanism to press the rear end of the bar W forward (S1). As a result, the front end portion of the bar W is supplied to the NC lathe 20.

The controller C2 controls the operations of the spindles 21 and 25 and the cutting tools 23 and 24 in accordance with the main program, processes the product from the front end portion of the bar W, and cuts it off. The feed arrow 13 pushes the bar W forward, so that the feed arrow 13 and the bar W advance according to the movement of the main shafts 21 and 25. As a result of many products being cut off from the bar W,
The total length of the bar W is shortened to a length where the NC lathe 20 cannot machine the product. The bar W in this state is shown as the end material EW in FIG. 3A.

In FIG. 3A, the bar W (EW) is the first
It is in a state immediately after the end product is cut off by the bite 23. The finger chuck 14 is the collet chuck 2.
2 and is slightly separated from the rear end surface of the end material EW. The outer diameter of the end material EW is almost equal to the outer diameter of the finger chuck 14 and larger than the inner diameter d of the finger chuck 14. Further, the rear end surface of the bar W is in the state of the end surface of the material, and no special finish is applied.

The position of the finger chuck 14 shown in FIG. 3A is the position detection sensor LS for detecting the position of the feed arrow 13.
Detected by B. When the controller C2 detects the ON operation of the position detection sensor LSB via the controller C1, the controller C2 executes a specific subprogram (S3,
4). In this subprogram of the controller C2, as shown in FIG. 3B, the front end portion of the end material EW is gripped by the collet chuck 26 of the second main spindle 25, and the rear end outer peripheral portion is cut by the second cutting tool 24. The outer diameter of the rear end of the cut end material EW is the finger chuck 1
4, which is substantially equal to the inner diameter d of 4, so that the finger chuck 14 can grip the rear end portion of the end material EW.

Next, the controller C1 sends the feed arrow 13
And move the rear end of the end material EW to the finger chuck 1
4 is inserted into the bore (S5). The feed arrow 13 advances until its rear end abuts the stopper 19 (FIG. 1).
When the position detection sensor LSA adjacent to the stopper 19 is turned on, the scrap EW enters the bore of the finger chuck 14.
Is completely inserted, and the end material EW is, as shown in FIG. 3C,
It is firmly gripped by the finger chuck 14. When the position detection sensor LSA is turned on, the controller C2
Releases the collet chuck 26 of the second spindle 25 (S
7), the collet chuck C2 retracts the feed arrow 13 (S8). Immediately before the feed arrow 13 retracts to the rearmost position, the residual material discharging mechanism grips the mill end material EW and separates the feed arrow 13 and the mill end material EW. The residual material discharging mechanism further releases the scrap EW and drops it into the residual material receiver (S9).

As described above, in the bar material supplying method according to the present embodiment, the bar material W is NC lathe 2 by the finger chuck 14 having an outer diameter substantially equal to the outer diameter of the bar material W.
Pressing toward 0, the overall length of the bar W is shortened and the end material EW
When it becomes, the rear end of the scrap EW is cut by the subprogram, and the scrap EW by the finger chuck 14 is cut.
It is possible to grasp. Next, advance the feed arrow 13,
The end material EW is held by the finger chuck 14 and the feed arrow 13 is retracted.

According to the bar material supplying method of this embodiment, the feed arrow 13 is separated from the rear end of the bar material W when the bar material W is cut, and the rotation of the bar material W during the cutting process is applied to the feed arrow 13. Can be prevented from being transmitted. Moreover, the mill ends EW left on the NC lathe 20 at the time of completion of the work of the product can be brought back to the bar feeder 10 by the feed arrow 13 and discharged without discharging into the NC lathe 20. Therefore, damage to the product and damage to the chip conveyor can be avoided.

Further, the bar material supply control means in the above embodiment includes controllers C1 and C2 for controlling the operation of the bar material supply machine 10 and the NC lathe 20, and a position detection sensor LSA for detecting the most advanced position of the feed arrow 13. And a position detection sensor LSB positioned behind the most forward position by a predetermined distance. The position detection sensor LSB is N
The bar W in the C lathe 20 is arranged so as to detect the position of the feed arrow 13 occupied at the time when the bar W becomes the scrap EW. When the position detection sensor LSB is turned on, the controller C2 cuts the rear end of the end material EW by a subprogram and reduces the diameter to a diameter that can be gripped by the finger chuck 14, and the controller C2 moves the feed arrow 13 The finger chuck 14 is advanced to grip the end material EW.
According to the bar material supply control means configured as described above, the bar material W having an outer diameter larger than the outer diameter of the outer diameter grip type finger chuck 14 is set in the NC lathe 20.
And feed the end material EW with the feed arrow 13
You can bring it back to zero.

Although the outer diameter of the finger chuck 14 is set to be substantially equal to the outer diameter of the rod W in the above embodiment, the outer diameter of the finger chuck is set to be smaller than the outer diameter of the rod W. Is also good. FIG. 4 is an explanatory view showing another embodiment of the bar material supplying method according to the present invention. In this example, the finger chuck 14 is an inner diameter grip type finger chuck having an outer diameter substantially equal to that of the rod W, but having a grip claw having an outer diameter smaller than that of the rod W. That is, the finger chuck 14 is of a type in which the gripping claw is inserted into an axial hole formed in the rear end surface of the bar W and engages with the inner peripheral surface of this hole to grip the bar W. Is.

However, the rear end surface of the bar W is not subjected to any special pre-processing, that is, boring, and is in the state of the end surface of the material. Therefore, the finger chuck 14 is
Only the rear end surface of the bar W can be pressed toward the NC lathe 20. By the operation of the NC lathe 20 according to the main program, the product is machined from the front end portion of the bar W as in the above-mentioned embodiment. During this time, the feed arrow 13 pushes the bar W forward. The feed arrow 13 and the bar W move forward according to the operation of the main shaft 21 of the NC lathe 20. The total length of the bar W is NC
When the product is shortened to a length that cannot be machined by the lathe 20, the end material EW shown in FIG. 4A is left on the spindle 21.

Similar to the above embodiment, the controller C2
Has a sub-program for processing the scrap EW. Under this subprogram, as shown in FIG. 4A, the cutting tool 23 is retracted, and the drill 30 is moved to the machining axis XX.
Line up. Next, as shown in FIG. 4B, the drill 30 drills the end material EW to form a through hole in the end material EW in the axial direction. The diameter d of the through hole is set to be substantially the same as the outer diameter d of the grip claw of the finger chuck 14.

When the through hole is formed in the end material EW, the controller C1 advances the feed arrow 13. The gripping claw of the finger chuck 14 is inserted into the through hole of the end material EW,
Engages with the inner peripheral surface of the through hole. This state is shown in FIG. 4C. Next, the controller C2 releases the collet chuck 22, and the controller C1 retracts the feed arrow 13. Thus, the end material EW brought back to the bar feeder 10 by the feed arrow 13 is discharged by the residual material discharging mechanism as in the above-described embodiment.

The feed arrow 1 at the time when the scrap EW is left
3 (FIG. 4A) and the position of the feed arrow 13 when the finger chuck 14 grips the scrap EW (FIG. 4C).
Are the position detection sensors LSA and LS as in the above-described embodiment.
Respectively detected by B. As described above, according to the bar material supplying method of the present embodiment, the bar material W is pressed toward the NC lathe 20 by the inner diameter grip type finger chuck 14 having an outer diameter substantially equal to the outer diameter of the bar material W, When the total length of the bar W is shortened to the end material EW, a through hole is formed in the end material EW in the axial direction by the subprogram so that the finger chuck 14 can hold the end material EW. Then
The feed arrow 13 is moved forward to cause the finger chuck 14 to grip the end material EW, and the feed arrow 13 is moved backward.

Therefore, according to the bar material feeding method of this embodiment, the feed arrow 13 is separated from the rear end of the bar material W when the bar material W is cut, and the rotation of the bar material W during the cutting work is controlled by the feed arrow. 1
It is possible to avoid the transmission to the third party. Moreover, the scrap EW left on the NC lathe 20 at the time of the completion of the product machining is processed by the NC lathe 20.
It can be discharged to the bar feeder 10 by the feed arrow 13 without discharging it inside. Therefore, damage to the product in the parts catcher of the NC lathe 20 and damage to the chip conveyor can be avoided.

[0031]

According to the above configuration of the present invention, in the bar material feeding method for continuously feeding a long bar material to the automatic lathe by the feed arrow of the bar material feeder, a special bar is provided at the rear end portion of the bar material. Provide a bar material supply method that can use a finger chuck with an outer diameter smaller than the outer diameter of the bar material without performing any special processing, and can prevent product damage due to discharge of end material and wear of the chip conveyor It becomes possible to do.

Further, according to the present invention, in the bar material supply control device of the automatic bar material processing apparatus constituted by combining the bar material supplying machine and the automatic lathe, the above bar material supplying method is suitable with a simple structure. It is possible to provide a bar material supply control device that can perform the above.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of an automatic bar processing apparatus to which a bar processing method according to the present invention is applied.

FIG. 2 is a flowchart showing a control method of the automatic bar processing apparatus in the controller shown in FIG.

FIG. 3 is an explanatory view showing a final stage of a turning process in the automatic bar material processing apparatus shown in FIG.

FIG. 4 is an explanatory view showing another embodiment of the bar feeding method according to the present invention.

[Explanation of symbols]

 1 Automatic Bar Machining Device 10 Bar Material Feeder 11 Leg 12 Frame 13 Feed Arrow 14 Finger Chuck 20 NC Lathe 21 First Spindle 22 Collet Chuck 23 First Bit 24 Second Bit 25 Second Spindle 26 Collet Chuck LSA Position Detection Sensor LSB Position detection sensor C1 controller C2 controller

Claims (2)

(57) [Claims] 1. A bar material supplying method for continuously supplying a long bar material to an automatic lathe by a feed arrow of a bar material supplying device, wherein the bar material has an outer diameter not larger than an outer diameter of the bar material so as to be supplied to the automatic lathe. When a finger chuck with the outer diameter of the bar is brought into contact with the rear end surface of the bar and the bar is pressed toward the automatic lathe by the feed arrow, and the total length of the bar is shortened to the end, the finger chuck A bar material feeding method characterized in that an end material is processed by an automatic lathe so that the end material can be gripped by, a feed arrow is advanced, a finger chuck grips the end material, and the feed arrow is retracted. 2. A bar material supply control device for an automatic bar material processing apparatus configured by combining a bar material supply machine and an automatic lathe, wherein a controller for controlling the operation of the bar material supply machine and the automatic lathe, and a bar material. First position detecting means for detecting that the feed arrow of the feeder has reached the most advanced position, and second position detection for detecting the position of the feed arrow occupied when the bar material in the automatic lathe becomes a scrap material. The controller, when the second position detecting means detects that the bar has become a scrap, cuts the scrap into a form that can be gripped by the finger chuck of the feed arrow. As described above, the feedstock is advanced until the feedstock processing means for controlling the processing device of the automatic lathe and the first position detection means detect that the feedarrow reaches the most advanced position, and End in forward position The bar feeding control apparatus characterized by having an end member gripping means for gripping the finger chuck.