JP2881541B2 - Bar processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a bar feeder and a bar feeder, and more particularly, to a bar feeder for feeding a bar to a lathe by a predetermined set amount of movement. The present invention relates to a bar feeder and a bar feeder provided with the bar feeder.

[0002]

2. Description of the Related Art Automatic lathes, such as NC lathes, for cutting the tip of a bar based on a preset product processing program are widely used. This kind of lathe,
Generally, a movable or fixed spindle having a spindle for rotating a bar at high speed, and a processing tool for turning the bar are provided, and the tip of the bar is cut into a product shape. Cut through the product from the tip. Further, there is known an automatic bar feeder configured to automatically feed a relatively long bar to a lathe side. Such a bar feeder is provided with a bar feeder that feeds the bar to the lathe. The bar feeder includes an elongated bar feeder that feeds the bar toward the lathe, a drive motor and a chain. And a driving device for moving the bar feed member composed of the above. The bar feed member is generally called a feed arrow, and is provided with a driving force or thrust in a forward direction by a driving device, and the bar is moved to the main spindle of the lathe by a predetermined moving set amount according to a lathe product processing process. Send out. The bar supply machine also includes a new material supply mechanism such as a material shelf for stocking a plurality of bars (new materials) to be supplied to the lathe. Generally, the new material supply mechanism discharges the remaining material held by the finger chuck of the feed arrow after the lathe cuts the final product from the bar and then replenishes the new material on the material shelf to the bar supply mechanism. I do.

[0003] Such a lathe and a bar feeder are generally used in combination with each other, and constitute a bar processing apparatus as a whole. Here, there are known two types of so-called long type and short type as a type of a bar feeder constituting a bar processing apparatus. The long type bar feeder is configured such that the feed arrow linearly reciprocates along the processing axis. On the other hand, a short-type bar feeder is provided with a feed arrow slide device for retracting a feed arrow to the side when a new material is supplied from a material shelf to a guide rail, and a new material being fed to a predetermined position while the feed arrow is retracting. And a primary feed member for advancing to the range.

[0004]

However, in the bar feeder of the long type, when the feed arrow is retracted to the rearmost position, the rear end of the feed arrow is located considerably behind.
For this reason, the entire length of the bar feeder, that is, the overall length (floor dimension) of the bar processing device must be designed to be extremely large. On the other hand, since the short-type bar feeder is configured to retract the feed arrow to the side and advance the new bar to a predetermined range by the primary feed member, the overall length of the bar feeder, In addition, the overall length of the bar processing apparatus can be greatly reduced. However, the short-type bar feeder requires a primary feed device such as a feed arrow slide device, a primary feed member, and a device for operating the primary feed member. This not only complicates the mechanism of the bar feeder, but also increases the price of the bar feeder, and accordingly the equipment cost of the bar processing device. Also, in the conventional bar processing apparatus, since the feed arrow normally grips the bar until the final product processing, the front end of the feed arrow is inserted into the main shaft of the lathe and moves forward just before the collet chuck. . For this reason, the total length of the feed arrow protruding from the bar feeder must be increased, so that there has been a problem that the floor dimension becomes longer and the apparatus becomes larger. In addition, the length of the spindle differs depending on the type of lathe, and it is necessary to replace the feed arrow with the one corresponding to the length of the spindle.This requires multiple types of feed arrows with different lengths, which makes production management extremely complicated. There was an inconvenience of becoming.

An object of the present invention is to eliminate the need for a primary feeder, to reduce the floor size by shortening the bar feed member, and to eliminate the need to exchange feed arrows even if the spindle length is different. An object of the present invention is to provide a bar feeder and a bar feeder provided with the bar feeder.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a movable carrier which is provided forward of a main shaft in a bar feeding direction and which can reciprocate along a bar processing axis. And a sub-chuck for gripping the tip of the bar, which is attached to the bar, and by moving the movable carrier forward, the bar gripped by the sub-chuck is adjusted to the product length of the bar. And a bar feeder having a bar feeder that moves following the forward movement of the bar, wherein the front end of the bar feeder is provided. The surface is formed with a hole that opens forward and receives the rear end of the bar so as to allow relative movement and relative rotation of the bar in the axial direction. Follows the forward movement of the bar, In the moving state, the automatic lathe moves to a position near the rear of the main spindle, the sub chuck grips the remaining material, and the movable carrier moves forward, whereby the remaining material is discarded in front of the main spindle. This can be achieved by a bar processing apparatus characterized by the above.
Such a bar processing apparatus operates as follows. The sub-chuck provided in front of the main shaft of the automatic lathe in the bar feeding direction grips the leading end of the bar, and the movable carrier to which the sub-chuck is attached moves forward, so that the bar is turned into a bar. Is moved forward according to the product length. The bar feed member follows the bar. During this time, the rear end of the bar is received in the hole of the bar feed member, and the rotation of the bar prevents the rear end of the bar from swinging greatly, and the bar feed member is moved. When the movement of the movable carrier cannot be completely followed, the relative movement of the rear end portion of the bar feeding member with respect to the bar feeding member in the hole of the bar feeding member is allowed. The front end of the bar feed member moves only to a position near the rear of the main spindle of the lathe. As the processing of the bar progresses further, as the bar is moved forward by the sub-chuck and the movable carrier, the rear end of the bar received in the hole of the bar feed member becomes the bar material. It relatively moves in the axial direction with respect to the feed member, and is eventually pulled out of the hole of the bar feed member. The last remaining material is discarded in front of the main shaft by the sub chuck gripping the movable carrier and moving forward. According to the present invention, since the remaining material is processed by the sub chuck and the movable carrier of the automatic lathe, the bar feeding member does not need to enter the main shaft and take the remaining material back to the bar feeder side. It is sufficient that the bar feed member is moved to a position near the rear of the main spindle of the automatic lathe.
Therefore, regardless of the length of the main shaft, the length of the bar feed member can be reduced, and thus the entire bar feeder can be downsized. Also, since the rear end of the bar is received in the hole of the bar feed member, it prevents the rear end of the bar from swinging greatly due to the rotation of the bar during the processing of the bar. can do.

Further, an elastic member may be interposed between the inner peripheral wall of the hole of the rod feed member and the rod, and in such a case,
It helps to prevent noise when the bar is rotating and to reduce friction with the bar.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a bar feeder according to the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a longitudinal sectional view showing a schematic structure of a bar feeder 13 of a bar feeder according to the present invention. The bar feed member 13 is
A cylindrical rod insertion tube 30; a cylindrical rod insertion portion 13b screwed around an outer periphery of a front end of the rod insertion tube 30; and a nut 31 screwed to a rear end of the rod insertion tube 30. And At the rear end of the rod insertion tube 30, an endless chain 14 for transmitting a driving force to the rod feed member 13 as described later (FIG. 2)
Is provided with a protruding portion 13a that is locked to the projection 13a. Nut 3
1 closes the rear end opening of the rod insertion tube 30. The bar insertion portion 13b has an open end 33 facing the inner tube 23a of the spindle 23. A cylindrical elastic member 32 made of, for example, urethane resin is arranged inside the bar insertion portion 13b, and is useful for soundproofing when the bar rotates and reducing friction with the bar. Also, the elastic member 3
The inner diameter of the rod 2 is set to be slightly larger than the outer diameter of the rod W to prevent a large swing of the rear end of the rod W during rotation. The elastic member 32 includes an opening end 33 and the rod insertion tube 3.
0, and is removably attached to the bar insertion portion 13b so that it can be appropriately replaced according to the diameter of the bar W. Bar insertion tube 30, bar insertion section 13
b and the elastic member 32 are arranged concentrically with the processing axis XX, pass through the open end 33 of the bar insertion portion 13b, and form a space receiving portion that receives the rear end of the bar W. 34 are formed. The nut 31 is driven by the driving force applied in the forward direction of the bar feed member 13 to move the bar W
Abuts the rear end face. The bar receiving portion 34 has an open end 33.
The rear end portion of the bar W inserted from is inserted so as to be displaceable in the axial direction. If the bar W and the bar feed member 13 have different forward speeds, the rear end of the bar W becomes a solid line. As shown by the arrow. The total length of the bar feed member 13 is:
Before the movement, the rear end is located forward of the rear end of the main body frame 11 (FIG. 2) of the bar feeder 1, and the front end of the bar feed member 13 is moved to the opening at the front end. The end 33 is designed not to be inserted into the main shaft, but to be located behind the inner tube 23a of the spindle 23 of the main shaft (see FIG. 1).

FIG. 2 is a schematic plan view of a bar processing apparatus having a bar feeder provided with the bar feed member shown in FIG.
As shown in FIG. 2, the bar processing apparatus includes a bar feeder 1 that supplies a new material W ′ to be cut, and a bar that cuts a tip portion of the bar into a product shape to cut off a desired product. And a lathe 2. The bar feeder 1 includes a main body frame 11, a bar feed mechanism including the above-described bar feeder 13, and a stock material to be replenished, that is, a new material supply for holding a plurality of new materials W 'of bars. Mechanism. The body frame 11
Lathe 2 supported by a plurality of stands (not shown)
Extends along the processing axis XX of FIG. The new material supply mechanism includes a material shelf 12 on which a new material W can be placed. The material shelf 12 has a plurality of shelf members 12a, and the shelf members 12a
Is disposed on the side of the main body frame 11 and supports a new material W ′ to be supplied. Each shelf member 12 a is arranged at a predetermined interval in the axial direction of the bar feeder 1, and projects laterally from the main body frame 11. The bar feeding mechanism of the bar feeder 1 includes a bar feeder 13 for feeding the new bar W ′ to the lathe 2 along the processing axis X─X, and a driving force or thrust applied to the bar feeder 13. And an endless chain 14 for transmitting the The bar feed member 13 is moved by a processing axis X by a guide rail (not shown) fixed on the main body frame 11.
It is guided so as to be able to reciprocate back and forth along -X. The bar feeder 13 includes a bar insertion portion 13b that rotatably receives the rear end of the new material W '.

The endless chain 14 is wound around sprockets 15, 15 rotatably supported at the front end and the rear end of the main body frame 11. The endless chain 14 is also wound around a drive sprocket (not shown), and the drive sprocket is operatively connected to an output shaft of a drive motor (not shown) via an electromagnetic clutch or the like. The bar feeder 1 also includes a clamp device 16 that can clamp the new material W ′ put on the guide rail. Clamping device 16
Has left and right clamp members 16a and 16b that can be opened and closed, and the clamp members 16a and 16b approach each other to clamp the new material W 'and separate from each other to release the new material W'. The bar feeder 1 further includes a dedicated controller C1 for controlling operations of a bar feed mechanism, a new material replenishment mechanism, and the like;
A front end position sensor LS1 and a rear end position sensor LS3 for detecting the position of the bar feed member 13 and a clamp opening / closing sensor (not shown) for detecting opening and closing of the clamp device 16 are provided. Each of the front end position sensor LS1 and the rear end position sensor LS3 is a limit switch that is turned ON by contact with the protruding portion 13a of the bar feeder 13. The detection results of the front end position sensor LS1, the rear end position sensor LS3, and the clamp open / close sensor are:
The signal is input to the controller C1 and is input to the cooperative control controller C3 via the illustrated signal line. Each of the controllers C1 and C3 has a built-in programmable computer including an operation unit, an operation control unit, an alarm unit, and the like. The controller C1 automatically controls the operation of the bar feeder 1, and the controller C3 controls the bar feed. Signal S for timing the specific operation of machine 1 and lathe 2
a and Sb are input to the controller C1 and the dedicated controller C2 of the lathe 2, respectively, and cooperatively control the operations of various components of the bar feeder 1 and the lathe 2.

The lathe 2 is an NC lathe having a fixed spindle, and has a spindle 21 arranged at a predetermined position along a machining axis X─X. The main shaft 21 includes a main chuck 22 composed of a collet chuck capable of gripping a bar, and a main chuck 22.
And a spindle 23 for rotating the rod at a high speed, so that the bar held by the main chuck 22 is rotated at a high speed. In front of the main shaft 21, a cutting tool 24 for cutting the bar and a sub chuck 26 arranged concentrically with the main shaft 21 are arranged. The cutting tool 24 is supported by a tool holder (not shown).
It approaches or separates from the machining axis X─X. The sub chuck 26 is attached to a movable carrier 25 that can reciprocate in parallel with the processing axis X 軸 X, and approaches or separates from the main shaft 21 on the processing axis X─X, thereby pulling out a bar. Drain residual materials. The lathe 2 includes a chuck opening / closing sensor LS11 for detecting opening / closing of the main chuck 22 and a chuck opening / closing sensor LS1 for detecting opening / closing of the sub chuck 26.
2 and a rotary encoder E for detecting the position of the movable carrier 25. The detection results of the chuck opening / closing sensors LS11 and LS12 and the rotary encoder E are input to the dedicated controller C2 and the cooperative control controller C3 of the lathe 2, respectively.

Referring to FIG. 2, the bar feeder 1 retreats the bar feed member 13 to the rearmost position and separates the clamp members 16a and 16b of the clamp device 16 from each other. The state of the bar feeder 1 before starting the supply of new material is illustrated. Also, in FIG.
Releases the main chuck 22 and the sub chuck 26, retreats the carrier 25 to the forefront position, and
Are separated from the processing axis XX. That is, FIG. 2 shows a state of the lathe 2 before the start of machining. Figure 5
FIG. 17 is a schematic plan view showing the subsequent operation of the bar processing apparatus in a stepwise manner, and FIGS.
It is a flowchart which shows the schematic control routine of the bar processing apparatus performed by C2 and C3. In addition, in FIG. 3 and FIG. 4, the symbol S means a step. 5 to 17, the controller C3 is not shown. In FIG. 2, the projection 13a of the bar feed member 13 is in contact with the rearmost position sensor LS3. The controllers C1 and C3 detect the rearmost position of the bar feeder 13 based on the detection signal of the rearmost position sensor LS3. The controller C1 instructs the new material supply mechanism to supply the new material W ′, and the new material supply mechanism supplies the new material W ′ on the material shelf 12.
Is put into the guide rail of the bar supply mechanism (S1). The controller C1 further moves the clamp members 16a and 16b of the clamp device 16 to the closed position and operates the drive motor of the bar supply mechanism for a predetermined time. The clamp members 16a and 16b pinch and restrain the bar W (new bar W ') on the guide rail, and the endless chain 14 travels in the bar feed member forward direction and advances the bar feed member 13. . As a result, the rear end of the bar W is inserted into the bar insertion portion 13b of the bar feed member 13 as shown in FIG.
2). When the bar W is inserted into the bar insertion portion 13b, the controller C1 switches the clamp device 16 to the open position.

The controller C3 includes a main chuck 22
After confirming that the bar is opened, the operation signal Sa of the bar feeder 13 is activated.
Is output to the controller C1, and the bar feeder 13 is advanced to the shortcut position (S3, 4, 5). As a result, the front end of the bar W projects forward of the main chuck 22. The bar W is reliably moved to a shortcut position shown in FIG. 6 by a shortcut device (not shown). The controller C2 switches the main chuck 22 to the closed position, and causes the lathe 2 to execute so-called shortcut processing (S7, 8). The main chuck 22 holds the bar W, the spindle 23 is driven, and the bar W rotates at high speed. At this time, the rear end of the bar W is
The third elastic member 13b is rotatably supported.
In addition, the cutting tool 24 moves to the cutoff position, cuts a very short piece S from the front end of the bar W as shown in FIG. 7, and generally cuts the front end surface of the irregular bar W. The controller C2 further confirms the opening of the sub chuck 26 (S9, 10), and thereafter drives the carrier 25,
The sub chuck 26 is retracted as shown in FIG. 8 (S1).
1, 12). The controller C3 detects the amount of movement of the carrier 25 by the rotary encoder E, and outputs a chuck operation signal Sb to the controller C2 when the carrier 25 moves to a predetermined last retreat position. The controller C2 switches the sub chuck 26 to the closed position and switches the main chuck 22 to the open position (S13 to S16),
Further, the carrier 25 is advanced (S17). As shown in FIG. 9, as the carrier 25 advances, the bar W is drawn forward from the main chuck 22. At this time, the pulling speed of the carrier 25 for pulling out the bar W and the bar feeder 1
3, the rear end portion of the bar W is supported by the elastic member 32 of the bar insertion portion 13b, and the rear end of the bar W is moved from the nut 31 as shown by the solid line in FIG. Leave.

The controller C3 detects the amount of movement of the carrier 25 by the rotary encoder E, and when the sub chuck 26 advances by a length corresponding to the product length, instructs the stop of the carrier 25 by the chuck operation signal Sb. C2 stops the carrier 25 (S18,
19). The controller C2 further includes a main chuck 22
Is switched to the closed position and the open position of the sub chuck 26 is switched (S21, 22). Thereafter, as shown in FIG. 10, the sub chuck 26 is moved forward to the most advanced end (initial position) (S23, S24). . Thus, the bar W projects forward from the main chuck 22 by at least a predetermined product length, and the sub chuck 26 separates from the bar W and retreats forward. The controller C2 includes the spindle 21 and the byte 2
4 is instructed to execute product processing (S25, S2).
6) The main shaft 21 rotates the bar W
Is rotated at a high speed, the cutting tool 24 cuts the outer periphery of the bar W, and cuts a product of a predetermined length from the tip of the bar W.
The steps shown in FIGS. 8 to 10 are performed every time the product is cut off.
It is executed repeatedly. That is, each time one product is cut off from the tip of the bar W by the operation of the main shaft 21 and the cutting tool 24, the sub chuck 26 moves the bar W and the bar feed member 13 by a movement set amount corresponding to the product length. To the main shaft 21
And the cutting tool 24 manufactures the next product from the front end of the bar W and cuts through it.

By repeatedly performing such a product processing step, the length of the bar W is reduced, and the bar feed member 13 moves forward. As shown in FIG. 11, the protrusion 13a of the bar feed member 13
When the controller C3 contacts the front end position sensor LS1 at the predetermined position, the controller C3 inputs the chuck operation signal Sb to the controller C2, and the controller C2 switches the main chuck 22 to the closed position (S20, 27). When the controller C3 confirms the closed position of the main chuck 22 by the chuck opening / closing sensor LS11 (S28), the controllers C1 and C2 respectively control the bar feeder 1 and the lathe 2 which are substantially independent, and supply the bar. The machine 1 executes the replenishment operation of the new material W 'under the control of the controller C1 (S29 to S32), and the lathe 2 continues the product processing under the control of the controller C3 (S40 to S50). First, the operation of the bar feeder 1 after the closing operation of the main chuck 22 will be described. The controller C3 instructs the controller C1 to retreat the bar feed member 13, and the controller C1 reverses the drive motor of the bar feed mechanism (S
29). The endless chain 14 travels in the bar feed member retreating direction to retreat the bar feed member 13. When the bar feed member 13 separates from the main shaft 21, the main chuck 2
The bar W gripped by 2 is pulled out from the bar feeder 13. Therefore, as shown in FIG. 12, the bar W is left on the main shaft 21, and only the bar feed member 13 is retracted.

When the rear end position sensor LS3 comes into contact with the protruding portion 13a as shown in FIG. 12, the controller C1 stops the drive motor (S30) and instructs the new material supply mechanism to supply the new material W '. As shown in FIG. 13, the new material supply mechanism puts the new material W 'on the material shelf 12 into the guide rail of the bar material supply mechanism (S31). Further, the controller C1 operates the respective mechanisms so that the rear end of the bar W is inserted into the bar insertion portion 13b of the bar feeder 13 by substantially the same control as in step S2 (S32). During operation of the bar feeder 1, the lathe 2 operates as follows. After the closing operation of the main chuck 22 (S27, 28), the controller C2 calculates the number of products that can be further manufactured from the bar W based on the remaining length L of the bar W (FIG. 12) (S27).
40). Since the length of the bar feed member 13 is constant and the positional relationship between the bar feeder 1 and the lathe is substantially unchanged, the remaining length L of the bar W is determined by setting the front end position sensor LS1. It is a value that can be calculated backward by position. Controller C2
Calculates the remaining length L of the bar W, and calculates the number of products that can be manufactured.
The calculation is performed based on the predetermined product length and the remaining length L. As shown in FIGS. 12 to 14, the lathe 2 manufactures a product P from the tip of the bar W under the control of the controller C2, cuts it off, and the remaining length of the bar W is such that the product cannot be processed. The product processing is repeatedly executed until it is shortened (S41 to S43). The advance of the bar W and the product processing during the product processing are executed by substantially the same operations as those in steps S9 to S26.
The outline of such operation is as follows. (1) Opening of the main chuck 22 (2) Retreating of the sub chuck 26 by driving the carrier 25 (to the last retreat position) (3) Holding of the front end of the bar W by closing operation of the sub chuck 26 (see FIG. 8) Release of the bar W by opening the main chuck 22 (4) Advance of the sub chuck 26 by driving the carrier 25 (drawing of the bar W corresponding to the product length) (see FIG. 9) Stop of the carrier 25 (5) Sub Release of the front end of the bar W by the opening operation of the chuck 26 Gripping of the bar W by the closing operation of the main chuck 22 (6) Advance of the sub chuck 26 (the foremost end position (initial position)
(See FIG. 10) (7) Product Processing As shown in FIG. 14 and FIG. 15, when the remaining length of the bar W is reduced to a length where the product cannot be processed, the controller C2 causes the sub-chuck 26 to The sub chuck 26 is retracted and the sub chuck 26 is closed in order to grip the remaining material R. Next, the controller C2, as shown in FIG.
So that the sub chuck 2 is completely pulled out from the main shaft 21.
6 is advanced to the frontmost position, and thereafter, as shown in FIG. 17, the sub chuck 26 is switched to the open position, and the remaining material R is dropped (S44 to S46).

When the controller C2 confirms that the remaining material R has fallen, that is, the discharge of the remaining material (S47),
3 or directly outputs a forward command of the bar feed member 13 to the controller C1.
Rotates the drive motor of the bar supply mechanism forward, and advances the bar feeder 13 (S48, 33, 5). Thereafter, the control in step S5 and subsequent steps is executed, and the product processing from the new material W 'is performed by the bar feeder 1 and the lathe 2, as described above. As described above, the bar processing apparatus of the present embodiment includes the bar feeder 1 and the lathe 2, and the lathe 2 includes the main shaft 21 having the main chuck 22 and the movable carrier 25 facing the main shaft 21. And a sub chuck 26 supported by the sub chuck. The bar processing apparatus further includes a controller C3 for performing cooperative control between the controller C1 of the bar feeder 1 and the controller C2 of the lathe 2, and the controller C3 includes a front end position provided in the bar feeder 1. The detection results of the sensor LS1, the rearmost position sensor LS3, and the clamp open / close sensor, and the chuck open / close sensor LS11 provided on the lathe 2,
The detection results of the LS 12 and the rotary encoder E are input. Based on these detection results, the controller C3 controls the new bar supply operation and the bar supply operation of the bar feeder 1 and the operations of the main chuck 22 and the sub chuck 26 of the lathe 2 via the controllers C1 and C2. Coordinate control. In the bar processing apparatus of this example having such a configuration, the bar feed member 13 separates from the bar W when approaching the main shaft 21, and retreats while leaving the bar W on the main shaft 21. The supply machine 1 shifts to a new material supply operation. On the other hand, the lathe 2 continues the product processing process on the bar W while the bar feeder 1 is performing the new material replenishing operation, and discharges the remaining material R. Therefore, the new material supply process of the bar feeder 1 is executed and completed during the product processing process of the lathe 2. Thus, the time required for material replacement is greatly reduced, and the function of discharging the remaining material of the bar feeder 1 and the step of discharging the remaining material can be omitted.

Further, since the bar feeding member 13 is retracted before being inserted into the spindle 23 of the main shaft 21, the length of the bar feeding member 13 can be greatly reduced. Therefore, according to the above configuration, the bar feeding member 13 is not provided with the primary and secondary feeding mechanisms as in the conventional short type bar feeding machine.
And the overall length of the bar feeder 1 related to the length of the bar processing apparatus can be reduced, and the length of the entire bar processing apparatus can be reduced. The present invention is not limited to the above-mentioned embodiment applied to the fixed-spindle type automatic lathe, but can be similarly applied to a spindle-movable automatic lathe. In the above embodiment, the controller C3 is a dedicated controller C for each of the bar processing machine and the lathe.
Although provided separately or separately from C1 and C2, it is also possible to incorporate the function of the controller C3 into the controller C1 and / or the controller C2. Further, the position detecting device of the bar feeder in the above embodiment, that is, the contact type position sensors LS1, LS3 are replaced with another position detecting means such as a proximity switch or an encoder, or the position detecting device of the carrier, that is, Alternatively, the rotary encoder may be replaced with a contact type or non-contact type limit switch.

Further, in the above embodiment, the bar feed member is
When the bar insertion portion approaches the rear end of the spindle, the bar retreats. However, the bar feed member may be retracted when the bar feed member is inserted into the spindle to some extent.

[0020]

According to the present invention, the following excellent effects can be obtained. (1) The bar feed member has an open end that opens toward the main shaft of the lathe and inserts the rear end of the bar so that it can enter and exit, and a rear end of the bar inserted from the open end. A bar receiving portion that accommodates the bar so as to be displaceable in the axial direction, and a contact portion that abuts on a rear end surface of the bar inserted into the bar receiving portion. In the state where the member is at the foremost end movement position, it is located behind the main shaft of the lathe, so that the front end of the bar feed member is not inserted into the main shaft of the lathe, and the bar feed member does not protrude from the bar feeder. Can be designed to be shorter. (2) Even when used for lathes having different spindle lengths, it is not necessary to exchange feed arrows, so that production management can be easily performed. (3) Even in a short type bar feeder, there is no need for a primary feed device such as a feed arrow slide device, a primary feed member and an actuating device for the primary feed member, and the mechanism of the bar feeder can be simplified.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a schematic structure of a bar feeder of a bar feeder according to the present invention.

FIG. 2 is a schematic plan view showing the entire configuration of a bar processing apparatus.

FIG. 3 is a flowchart partially showing a schematic control routine of the bar processing apparatus executed by all controllers of the bar processing apparatus.

FIG. 4 is a flowchart partially showing a schematic control routine of the bar processing apparatus executed by all controllers of the bar processing apparatus.

FIG. 5 is a schematic plan view showing a step of inserting a rear end portion of a bar into a bar feed member.

FIG. 6 is a schematic plan view of the bar processing apparatus showing a state where the bar is advanced to a shortcut position by advancing a bar feed member.

FIG. 7 is a schematic plan view of the bar processing apparatus showing a shortcut process.

FIG. 8 is a schematic plan view of a bar processing apparatus showing a process of gripping a bar by a sub chuck.

FIG. 9 is a schematic plan view of a bar processing apparatus showing a process of drawing a bar by a sub chuck.

FIG. 10 is a schematic plan view of a bar processing apparatus showing a product processing step.

FIG. 11 is a schematic plan view of the bar processing apparatus showing a state where the front end of the bar feed member approaches the main shaft.

FIG. 12 is a schematic plan view of the bar processing apparatus showing a retreating step of the bar feed member.

FIG. 13 is a schematic plan view of a bar processing apparatus showing a new material supply step and a product processing step executed in parallel.

FIG. 14 is a schematic plan view of a bar processing apparatus showing a new material insertion step and a product processing step performed in parallel.

FIG. 15 is a schematic plan view of a bar processing apparatus showing a process of gripping remaining material by a sub chuck.

FIG. 16 is a schematic plan view of a bar processing apparatus showing a process of extracting remaining material by a sub chuck.

FIG. 17 is a schematic plan view of a bar processing apparatus showing a process of discharging residual material by a sub chuck.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bar feeder 2 Lathe 11 Main frame 12 Material shelf 13 Bar feed member 13a Projection 13b Bar insertion part 14 Endless chain 15 Sprocket 16 Clamping device 21 Main shaft 22 Main chuck 23 Spindle (rotation drive means) 24 Byte (machining) Tool) 25 Movable carrier 26 Sub chuck (bar pull-out device) 31 Nut (contact portion) 32 Elastic member 33 Open end 34 Bar receiving portion C1, C2, C3 Controller (control device) LS1 Front end position sensor LS3 Last End position sensor LS11, LS12 Chuck open / close sensor E Rotary encoder

Claims (3)

(57) [Claims] 1. A movable carrier which is provided in front of a main shaft in a direction in which a bar is fed and which can reciprocate along a bar processing axis, and grips a tip end of a bar attached to the movable carrier. An automatic lathe having a sub-chuck for moving the movable carrier forward to move the bar held by the sub-chuck forward in accordance with the product length of the bar; A bar feeder having a bar feeder that moves following the forward movement of the bar feeder, wherein the front end face of the bar feeder is opened forward,
And a hole for receiving the rear end of the bar is formed to allow relative movement and relative rotation of the bar in the axial direction, and the bar feed member follows the forward movement of the bar. hand,
In the foremost end movement state, the automatic lathe moves to a position near the rear of the main spindle, the sub chuck grips the remaining material, and the movable carrier moves forward, whereby the remaining material is discarded in front of the main spindle. A bar processing apparatus, characterized in that: 2. The bar processing apparatus according to claim 1, wherein an elastic member is interposed between an inner peripheral wall of the hole and the bar. 3. The bar processing apparatus according to claim 1, wherein a rear end of the bar is loosely fitted into the hole.