JPH0631501A - Bar feed method and device - Google Patents

Abstract

PURPOSE:To provide a bar feed method and a device therefor that can isolate a bar from a feeding arrow during working and reduce the outer diameter of the front end of the feed arrow without subjecting the bar to special pre- processing and can surely prevent the wear of a chip conveyor and damage to products caused by the discharge of end waste pieces. CONSTITUTION:A bar feed device is provided with a feeding arrow 13, a feeding arrow drive mechanism and a control device which controls the operation of the feeding arrow drive mechanism. The feeding arrow 13 is provided with a front end face that comes into contact with the rear end face of a bar, and a suction device 30 for sucking an end waste piece of the bar EW left on an automatic lathe. The control device is provided with a position detection means for detecting the position of the feed arrow 13 at the time of the final work of the bar and a suction device control means 44 for activating the suction device 30 when a front end 14 approaches an end waste piece of the bar and causing the suction device 30 to suck the end waste piece.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art An automatic lathe configured to machine a plurality of products from a front end portion of a bar material by turning a bar material as a material according to a predetermined program is put to practical use.
Further, there is known a bar material supplying device configured to supply a bar material to an automatic lathe continuously or automatically following the operation of the automatic lathe.

[0003] A bar material feeding device generally comprises a feed arrow for advancing the bar material toward an automatic lathe, a feed arrow drive mechanism for advancing or retracting the feed arrow, and a control device for controlling the operation of the feed arrow drive mechanism. It has and. As a method of supplying bars to an automatic lathe with this kind of bar feeder,
The following two bar feeding methods have been conventionally used. (1) A finger chuck for gripping the rear end of the bar is provided at the tip 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 the final product from the front end of the bar,
The residual material called mill ends is left on the main shaft of the automatic lathe, but the feed arrow retracts to the bar feeding device while holding the mill ends by the finger chuck. The residual material discharging mechanism of the bar material feeding device separates this end material from the finger chuck and discharges it to the outside of the machine. According to this method, the scrap material can be brought back to the bar material supply device and discharged. (2) The feed arrow presses the rear end surface of the bar with its front end surface,
Move forward towards the automatic lathe. The end material is pushed out in front of the main shaft at the front end surface of the feed arrow or the new material, and is carried out of the lathe by a parts catcher of an automatic lathe, a chip conveyor, or the like. According to this method, since the front end face of the feed rod can be separated from the rod during cutting of the rod, the rotation of the rod can be prevented from being transmitted to the feed arrow.

[0004]

However, the above-mentioned 2
With respect to the two methods, their respective problems have been pointed out in recent years. That is, (a) In the supply method in (1) above (hereinafter, referred to as the grip supply method), since an outer diameter grip type finger chuck that grips the outer peripheral surface of the bar is generally used, The outside diameter is much larger than the outside diameter of the bar. Therefore, there may be a case where the finger chuck cannot be inserted into the spindle internal pipe of the automatic lathe. In order to insert the finger chuck into the spindle inner tube, an attempt was made to use an outer diameter grip type finger chuck having an outer diameter less than the outer diameter of the bar material, or an inner diameter grip type finger chuck that grips the inner circumference of the bore from the inside. However, in order to grip a bar with such a finger chuck, it is necessary to perform special pre-processing such as shaving or boring on the rear end of the bar. However, processing only one end of a long bar is an extremely inefficient and complicated operation, and such processing cannot be adopted at present. Thus, in such a gripping and feeding method, not only the bar material and the feed arrow cannot be isolated during processing, but also there is a problem that it is difficult to insert the feed arrow into the spindle inner tube. (B) On the other hand, in the supply method in (2) above (hereinafter referred to as the pressure supply method), the scrap material left on the spindle is extruded in front of the spindle and carried out to the outside of the lathe together with the product or chips. To do. For this reason, there is a possibility that the product in the automatic lathe that has been precisely processed with high precision may be damaged or that the chip conveyor of the automatic lathe may be damaged. Such a problem becomes remarkable when the diameter of the rod is large and therefore a large amount of mill ends 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 feeding device. In the method, it is to provide a bar material supplying method capable of solving both the drawbacks in the grip supply method and the pressure supply method. More specifically, the bar material and the feed arrow can be isolated during processing, and It is possible to use a feed arrow equipped with a tip with an outer diameter smaller than the outer diameter of the bar material without performing special pre-processing.In addition, product damage due to discharge of the end material and wear of the chip conveyor can be prevented. It is to provide a bar feeding method that can be reliably prevented.

[0006] It is another object of the present invention to provide a bar material supplying device having the above-mentioned feed arrow, a feed arrow driving mechanism and a control device, which can implement the above bar material supplying method with a simple structure. And

[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 supplying device. In order to supply the bar to the automatic lathe, the tip of the feed arrow is brought into contact with the rear end surface of the bar, and the bar is fed to the automatic lathe by advancing the feed arrow toward the automatic lathe. While processing by an automatic lathe, the rear end face of the bar is separated from the tip part, and when the total length of the bar is shortened to become a scrap, the tip part is advanced to at least the vicinity of the rear end face of the bar. Then, there is provided a bar material supplying method characterized in that the end material is adsorbed by the end material adsorbing means provided at the tip portion, and the feed arrow is retracted together with the end material.

The present invention also includes a feed arrow that advances the rod toward the automatic lathe, a feed arrow drive mechanism that advances or retracts the feed arrow, and a controller that controls the operation of the feed arrow drive mechanism. In the bar material feeder provided, the feed arrow,
The control device is provided with a tip end surface that comes into contact with the rear end face of the bar and an adsorption device for adsorbing the end material remaining on the automatic lathe as a result of processing the bar by the automatic lathe. Position detecting means for detecting the position of the feed arrow during processing, and when the tip of the feed arrow approaches the end material, the suction device is operated to adsorb the end material by the suction device. There is provided a bar material supply device having a suction device control means for pressing.

According to the above configuration of the present invention, the bar can be supplied to the automatic lathe without gripping the bar with the finger chuck. Therefore, it is possible to reduce the outer diameter of the tip of the feed arrow so that it can be easily inserted into the main shaft of an automatic lathe, and at the time of cutting the bar material, separate the feed arrow from the rear end of the bar material to rotate the bar material. Can be prevented from being transmitted to the feed arrow. Further, the end material left on the automatic lathe at the time of completion of the work of the product is not discharged into the automatic lathe, but the end material can be adsorbed and taken back to the bar material feeding device together with the feed arrow, and discharged at the bar material feeding device side. Therefore,
Product damage on automatic lathes and chip conveyor damage can be avoided.

In a preferred embodiment of the present invention, the end material adsorbing means or the adsorbing device is provided with a suction cup for adsorbing the end piece by negative pressure, and the suction cup is attached so as to slightly project from the tip end portion. Energized. More preferably, the end material adsorbing means or the adsorbing device is provided with a two-position switching valve for controlling the opening / closing of the passage of the sucked air. Further, in another embodiment of the present invention, the end material adsorbing means or the adsorbing device includes an electromagnet capable of adsorbing the end material by magnetism, and an exciting circuit for controlling the electromagnet.

[0011]

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

FIG. 1 shows a bar material supplying device 10 and an NC lathe 20 which are aligned along a machining axis XX of the bar material. The bar supply device 10 includes a frame 12 supported by the legs 11 and 11, and a feed arrow 13 supported by the frame 12 so as to be movable along the machining axis XX. A front end portion 14 for pressing the rear end portion of the bar W is provided at the front end portion of the feed arrow 13. Tip 14
Has an outer diameter slightly smaller than the outer diameter of the bar W,
Do not grip the rear end of the bar W and use the NC lathe 2
You can only push towards zero.

The bar material supplying device 10 also includes a new material supplying mechanism and a feed arrow driving mechanism. The new material supply mechanism (not shown) feeds a bar material to be newly processed, that is, a new material, with an arrow 13
On the machining axis line XX in front of. The feed arrow drive mechanism includes a chain 15 and is configured to move the feed arrow 13 toward the NC lathe 20 by transmitting a driving force to the chain 15. The bar material supplying device 10 further includes a residual material receiver (not shown) arranged at a predetermined position in order to discharge the scrap material brought back by the feed arrow 13.

The bar feeding device 10 is provided with a controller CU for controlling the operation of the feed arrow 13 and various sensors for detecting the position or movement of the feed arrow 13 as means for controlling the rod feed operation. ing. The position detection sensor LSA shown in FIG. 1 is arranged at a position rearwardly separated from the front end of the frame 12 by a predetermined distance, and detects the position occupied by the feed arrow 13 at the start of the final processing stage of the bar W.
The position detection sensor LSA is connected to the controller CU like other sensors, and the controller CU
The operation of the feed arrow 13 is controlled based on the position of the feed arrow 13 detected by these sensors.

The NC lathe 20 is constructed as a so-called two-spindle type automatic spindle lathe with a collet chuck 22.
And a collet chuck 2 that is movable
And a movable second spindle 25 having a second spindle 2
5 is arranged in front of the first main shaft 21 so as to face the first main shaft 21. A first bite 23 corresponding to the first main spindle 21 and a second bite 24 corresponding to the second main spindle 25 are provided between the first main spindle 21 and the second main spindle 25.

FIG. 2 is a vertical cross-sectional view of the feed arrow 13 in a state where the rod W is advanced, and FIG. 3 is a vertical cross-sectional view of the feed arrow 13 in a state in which the end material EW is adsorbed. . As shown in FIG. 2, the feed arrow 13 is formed entirely hollow, and the cylindrical tip portion 14 has an outer diameter slightly larger than the outer diameter of the feed arrow 13 and slightly smaller than the outer diameter of the bar W. Have. When advancing the rod W, the feed arrow 13 is biased forward by the feed arrow drive mechanism, and the front end face or the tip face of the tip portion 14 presses the rear end face of the rod W toward the NC lathe 20. .

A suction cup 30 constituting an end material suction device is arranged in the hollow portion of the tip portion 14, and the suction cup 30 has a support shaft 32.
It is fixed to the front end of the. The support shaft 32 extends axially in the hollow portion of the feed arrow 13. A compression spring 36 for urging the support shaft 32 forward is arranged around the support shaft 32. The spring 36 includes an annular portion 34 integrally formed at a front end portion of the support shaft 32 and an inner portion of the feed arrow 13. It is inserted between an annular spring retainer 35 formed integrally with the peripheral wall. An annular stopper 38 is disposed between the annular portion 34 and the suction cup 30, and the annular stopper 38
Collides with the annular portion 34, and the support shaft 3 for the feed arrow 13
The forward movement of 2 can be regulated.

The suction cup 30 is made of an elastic member, and the front end face thereof has a mortar-like shape as a whole, and has a concave portion 31 opening toward the rear end face of the bar W in the central portion. The recess 31 communicates with a suction passage 33 formed in the base of the suction cup 30 and the shaft center of the support shaft 32, and the suction passage 33 includes the support shaft 32.
The flexible tube 4 is connected through a connection port 39 provided at the rear end of the flexible tube 4.
Connected to 1.

The flexible tube 41 penetrates the closing member 40 provided at the rear end of the feed arrow 13 and extends rearward of the feed arrow 13. A pressure gauge 42 for detecting a suction pressure is connected to the flexible tube 41, and a vacuum pump 46 that constitutes a suction air source is connected through an electromagnetic solenoid type normally closed two-position switching valve 44. To be done. In FIG. 1, the two-position switching valve 44 is located in the closed position, and the vacuum pump 46
The communication between the suction passage 41 and the suction passage 41 is cut off.

As shown in FIG. 3, when sucking the end material EW by the suction cup 30, the controller CU applies the solenoid 45 to switch the two-position switching valve 44 to the open position, and the vacuum pump 46 and the suction passage 41 are connected. To communicate. A negative pressure is formed in the recess 31 of the suction cup 30 by the action of the vacuum pump 46, and the rear end surface of the end material EW is adsorbed by the suction cup 30. Also,
The suction cup 30 is biased forward by the spring 36,
It slightly protrudes from the tip surface of the tip portion 14.

Next, the operation of the rod supply device 10 will be described. When a bar material to be newly machined is put on the machining axis XX in front of the feed arrow 13 by the new material supply mechanism, the feed arrow 13 is advanced by the feed arrow drive mechanism,
The tip portion 14 of the feed arrow 13 is pressed against the rear end surface of the bar W. The two-position switching valve 44 is located at the closed position, and the atmospheric pressure acts on the concave portion 31 of the suction cup 30. Tip 1
The suction cup 30 slightly protruding from 4 receives a reaction force from the rear end surface of the bar W and relatively moves rearward against the elastic force of the spring 36, and is moved into the tip portion 14 as shown in FIG. Pull in.
As a result, the front end surface of the front end portion 14 is pressed against the rear end surface of the bar W. Thus, the driving force of the feed arrow drive mechanism is transmitted to the bar W through the feed arrow 13, the bar W advances, and the front end portion of the bar W is supplied to the NC lathe 20.

The NC lathe 20 controls the operations of the spindles 21 and 25 and the cutting tools 23 and 24 according to a predetermined main program to machine a product from the front end portion of the bar W and cut it off. While machining the bar W, the NC lathe 20
Is separated from the tip portion 14, and the rod W is rotated by the main shafts 21 and 25. The feed arrow 13 is always urged forward by a feed arrow drive mechanism, and follows the operation of the main shafts 21 and 25 to advance the bar W. As a result of a large number of products being cut off from the bar W by the processing of the NC lathe 20, the total length of the bar W is gradually shortened, and when the final processing stage is completed, NC
The lathe 20 has a length of the end material E that can no longer be machined into the product.
W is left.

The controller CU is a position detection sensor LS.
When A detects the feed arrow 13 located at the start position of the final machining stage, a predetermined signal is input to the control device (not shown) of the NC lathe 20, and the NC lathe 20 performs the final machining on the bar W. The last product that can be cut off from the bar W is machined. When the final machining is completed, the controller of the NC lathe 20 inputs a predetermined signal to the controller CU, whereby the controller CU detects the end of the final machining stage, and the feed arrow drive mechanism moves the feed arrow 13 for a predetermined time. Only move forward. The predetermined time is set to a time at which the suction cup 30 protruding from the tip portion 14 can reach at least the rear end surface of the end material EW. The controller CU also applies the solenoid 45 to switch the two-position switching valve 44 to the open position. As a result, the suction pressure of the vacuum pump 46 acts on the recess 31 of the suction cup 30, and a negative pressure is formed in the recess 31. Thus, the suction cup 30 reaching the rear end surface of the end material EW is
Adsorb and hold it.

After the collet chuck of the NC lathe 20 is opened, the controller CU retracts the feed arrow 13 carrying the scrap EW, transfers the scrap EW to the upper region of the residual scrap receiver, and turns off the solenoid 45. The two-position switching valve 44 is urged to switch to the closed position, and the negative pressure in the recess 31 is released. The suction cup 30 releases the end material EW, and the remaining material receiver receives the falling end material EW.

As described above, in the above bar feeding method and bar feeding apparatus, the tip portion 14 of the feed arrow 13 merely contacts the rear end surface of the bar W, and the bar W is processed by the NC lathe 20. While being pressed, the rod W is separated from the rear end face thereof. Therefore, the rotation of the bar W during cutting is not transmitted to the feed arrow 13. Further, the end material EW left on the NC lathe 20 at the time of completion of working of the product is not discharged into the NC lathe 20, but is carried by the suction cup 30 of the feed arrow 13 and brought back to the bar material supply device 10. Therefore, it is possible to avoid product damage in the NC lathe 20 and chip conveyor damage.

In the above embodiment, the end material EW is adsorbed by the suction cup 30, but the end material EW may be adsorbed by the magnetism of the electromagnet.

[0027]

According to the above configuration of the present invention, the bar and the feed arrow can be isolated during processing, and the outer diameter of the bar is smaller than the outer diameter of the bar without any special pre-processing. It is possible to provide a bar material supply method and a bar material supply device that can use a feed arrow equipped with the tip end of the bar and can reliably prevent product damage due to discharge of end materials and wear of the chip conveyor. Becomes

[Brief description of drawings]

FIG. 1 is a schematic plan view of a bar feeding device to which a bar processing method according to the present invention is applied.

FIG. 2 is a vertical cross-sectional view of a feed arrow shown in a state where a bar is being advanced.

FIG. 3 is a vertical cross-sectional view of a feed arrow shown in a state in which end material is adsorbed.

[Explanation of symbols]

 10 bar feeding device 11 leg 12 frame 13 feed arrow 14 tip 20 NC lathe 30 suction cup 32 spindle 33 suction passage 34 annular part 35 spring retainer 36 compression spring 38 stopper 40 closing member 41 flexible tube 42 pressure gauge 43 2 Position switching valve 45 Solenoid 46 Vacuum pump LSA Position detection sensor CU controller

Claims (2)

[Claims] 1. A bar material supplying method for continuously supplying a long bar material to an automatic lathe by means of a feed arrow of a bar material supplying device, wherein a tip portion of the feed arrow is provided so as to supply the bar material to the automatic lathe. The bar is brought into contact with the rear end surface of the bar, and the bar is fed to the automatic lathe by advancing the feed arrow toward the automatic lathe. While the bar is processed by the automatic lathe, the rear end surface of the bar is moved from the tip. When the rods are separated from each other and the total length of the bar is shortened to become the end material, the tip is advanced to at least the vicinity of the rear end surface of the bar, and the end material is adsorbed by the end material suction means provided at the tip. Is adsorbed, and the feed arrow is retracted together with the end material. 2. A rod provided with a feed arrow for advancing the rod toward an automatic lathe, a feed arrow drive mechanism for advancing or retracting the feed arrow, and a control device for controlling the operation of the feed arrow drive mechanism. In the material supply device, the feed arrow includes a tip end surface that abuts the rear end surface of the bar material, and a suction device for adsorbing the end material remaining on the automatic lathe as a result of processing the bar material by the automatic lathe. The control device operates the suction device when the tip of the feed arrow approaches the end material, and a position detection means for detecting the position of the feed arrow at the time of final processing of the bar material. And a suction device control means for sucking the scrap material by the suction device.