JP6365420B2 - Bar supply machine and bar supply method - Google Patents

Description

  The present invention relates to a bar feeder and a bar feeding method for feeding a bar to a bar processing machine such as a lathe.

  2. Description of the Related Art Conventionally, there is known a bar feeder that feeds a bar forward to a bar processing machine by a bar feed member (feed arrow). The bar feed member is generally connected to a timing belt wound around a pulley that is driven to rotate by a motor. A finger chuck for gripping the rear end of the bar is provided at the front end of the bar feed member. The rear end of the bar is inserted into the finger chuck so that the bar feed member can run the timing belt. Along with this, it moves forward and feeds the bar toward the bar processing machine. When the tip of the bar is in contact with the stopper of the bar processing machine or a parting tool, the bar is gripped by the chuck of the headstock of the bar processing machine, and the headstock is moved back and forth (spindle movement type). Alternatively, the bar is processed by moving the tool post back and forth (main spindle fixed type).

  In the conventional bar supply machine, when the bar is fed forward by the bar feed member as described above and brought into contact with the stopper of the bar processing machine or the parting tool, the tip of the bar is a stopper, etc. Since the bar is strongly biased against the stopper by the bar feed member, the bar is bent by the biasing force. If the bar is processed in this state, the bar is rotated at a high speed by the main shaft, and the bar hits the inner wall, causing noise. In addition, if the bar swings, it cannot be processed precisely.

  Therefore, in order to remove the deflection of the bar held by the bar feed member in the bar feeder that moves the bar feed member in conjunction with the headstock of the spindle moving bar processing machine during bar processing, The endless member for the feed member that urges the bar feed member toward the main spindle moving type bar processing machine is moved so as to move backward by a predetermined distance with respect to the headstock when starting the bar processing. The thing which removes the bending of a bar material by extending the space | interval with a base by predetermined distance is proposed (for example, refer patent document 1).

JP 2001-246502 A

  By the way, in recent years, in order to manufacture a fine product such as a probe for measuring a semiconductor material, for example, there is an increasing demand for processing an extremely fine rod having a diameter of less than 1 mm with high accuracy. Here, in order to precisely process the bar while rotating the bar at a high speed, it is necessary to suppress the swinging due to the bending of the bar being processed.

However, since the extremely fine bar has low rigidity and is particularly likely to bend, the endless member for the feed member is moved so as to be retracted by a predetermined distance with respect to the headstock at the start of bar processing, Even if the interval between the bar feed member and the headstock is increased by a predetermined distance, the deflection of the bar may not be completely removed.
In addition, even if the deflection of the bar can be removed at the start of the bar processing, when the bar feed member is moved in conjunction with the headstock of the spindle moving type bar processing machine, the endless member for the feed member or the bar Due to the moment of inertia of the feed member and mechanical play, the movement of the bar feed member cannot be made to completely follow the movement of the headstock, which may cause the bar to bend.

  Then, this invention aims at providing the bar feeder which can remove the bending of a bar during bar processing in the bar feeder which supplies a very thin bar to a bar processing machine. To do.

In order to achieve the above object, a bar feeder according to the present invention is a bar feeder for feeding a bar to a bar processing machine, comprising a gripping means for gripping the rear end of the bar. A bar feed member for moving the bar relative to the bar processing machine, a driving means for driving the bar feed member back and forth with respect to the bar processing machine, and a bar processing by the bar processing machine , to remove the deflection of the bars, so as to provide a tensile force to rod, possess a drive control means for controlling the driving means the bar feeding member in a direction retracting from the bar processing machine, the drive The control means is characterized by controlling the driving means so as to decrease the tensile force as the advance distance of the bar feed member increases during the bar processing by the bar processing machine .
A bar feeder according to the present invention is a bar feeder for feeding a bar to a bar processing machine, comprising a gripping means for gripping the rear end portion of the bar. A bar feed member for moving the bar, a driving means for driving the bar feed member back and forth with respect to the bar processing machine, and bending of the bar during the bar processing by the bar processing machine Therefore, it has drive control means for controlling the drive means in a direction to retract the bar feed member from the bar processing machine so as to give a tensile force to the bar, and the drive control means During the processing of the bar material by the machine, when the advance distance of the bar material feeding member becomes a predetermined value or more, the control of the driving means in the direction to retract the bar material feeding member from the bar material processing machine is terminated. To do.
In the present invention configured as described above, unlike the conventional bar supply machine that urges the bar feed member toward the bar processing machine, the drive control means does not feed the bar during the bar processing. Since the drive means is controlled in the direction to retract the member from the bar processing machine, the rear end of the bar is pulled away from the bar processing machine by the bar feed member while the bar is being processed. Continue to be received. Thereby, it can process in the state which removed the bending of the bar always.

In the present invention, it is preferable that the bar processing machine is a main shaft moving type bar processing machine, which is rotationally driven by a driving means, converts the rotary motion into a linear motion, and converts the bar feeding member into the main shaft moving type bar. Transmission and transmission of the rotational motion by the feed member transmission device that moves forward or backward relative to the material processing machine, rotational motion conversion means that converts the movement of the main shaft into rotational motion, and rotational motion conversion means for the feed member transmission device. Switching means for switching, and during the bar processing, the movement of the main shaft is converted into rotational movement by the rotary motion conversion means and transmitted to the transmission device for the feed member via the switching means, thereby moving the main bar feed member to the main shaft And interlocking means for interlocking with the movement of the spindle of the die bar processing machine, and the drive control means is such that the rotational motion is transmitted from the rotational motion conversion means to the transmission device for the feed member by the switching means. In order to remove the deflection of the bars, so as to provide a tensile force to the bar, to control the driving means the bar feeding member in a direction retracting from the bar processing machine.
In the present invention configured as described above, when the bar feed member is moved in conjunction with the main shaft of the bar processing machine, due to the moment of inertia of the feed member transmission device and / or the interlocking means or mechanical play. Even if the movement of the bar feed member does not completely follow the movement of the main shaft, the bar feed member leaves the rear end of the bar from the bar processing machine while the bar is being processed. By continuing to pull, the processing can be performed in a state where the bending of the bar is always removed.

In the present invention, preferably, the bar processing machine is a spindle fixed bar processing machine.
In the present invention configured as described above, even when the bar is supplied to the main spindle fixed bar processing machine, the processing can be performed in a state where the bending of the bar is always removed.

A bar feeder according to the present invention is a bar feeder for feeding a bar to a bar processing machine, comprising a gripping means for gripping the rear end portion of the bar. A bar feed member for moving the bar, a driving means for driving the bar feed member back and forth with respect to the bar processing machine, and bending of the bar during the bar processing by the bar processing machine Therefore, it has a drive control means for controlling the drive means in a direction in which the bar feed member is retracted from the bar processing machine so as to give a tensile force to the bar, and the gripping means has a rear end of the bar parts and perforated by the finger chuck case that attached to the front end portion of the bar feeding member a hollow portion capable of receiving and in the hollow portion of the finger chuck case, cylindrical gripping member for gripping the rear end of the bar with the door, gripping member, during the processing of the bar by bar processing machine, the bar feeding member Rotatable about the hand axis, and is provided so as to be movable longitudinally within the hollow portion of the finger chuck case.
More preferably, the outer diameter of the gripping member is smaller than the inner diameter of the hollow portion of the finger chuck case, and a predetermined gap is formed between the outer peripheral surface of the gripping member and the inner peripheral surface of the hollow portion of the finger chuck case. It is like that. Further, the length of the gripping member in the longitudinal direction is shorter than the distance between the front end and the rear end that restricts the movement of the gripping member in the longitudinal direction in the hollow portion of the finger chuck case, and is gripped in the hollow portion of the finger chuck case. A predetermined gap is formed before and after the member.
In the present invention configured as described above, since the predetermined gap is formed between the outer peripheral surface of the gripping member and the inner peripheral surface of the hollow portion of the finger chuck case, the gripping member is hollow in the finger chuck case. Since it can rotate with the bar in the section, even when the bar is rotated at a high speed, the gripping member can be rotated sufficiently following the high-speed rotation, preventing the bar from being twisted. it can. In addition, since a predetermined gap is formed before and after the gripping member, even if the bar is pushed back from the bar processing machine toward the bar feed member, the gripping member that grips the rear end of the bar In the hollow part of the chuck case, the chuck case can move backward by a predetermined gap, and bending of the bar can be suppressed.

In the present invention, preferably, the gripping means includes a finger chuck case having a hollow portion that can receive the rear end portion of the bar, and a rear end of the bar that is rotatably accommodated in the hollow portion of the finger chuck case. An opening for receiving the rear end portion of the bar material into the hollow portion at the front end portion of the finger chuck case, and a rod at the front end portion of the gripping member. An opening into which the rear end of the material is inserted is formed, and the inner diameter on the front end side of the opening of the gripping member is larger than the inner diameter on the rear end side of the opening of the finger chuck case.
In the present invention configured as described above, the inner diameter on the front end side of the opening of the gripping member is larger than the inner diameter on the rear end side of the opening of the finger chuck case, so that gripping is performed via the opening of the finger chuck case. When the bar is inserted into the opening of the member, the front end of the gripping member can be prevented from interfering with the bar.

Further, the bar supply method according to the present invention is a bar supply method for supplying a bar to a bar processing machine, the step of gripping the rear end portion of the bar by the gripping means of the bar feed member, The bar is advanced by the bar feed member and biased against the stopper provided on the bar processing machine, the bar is held by the chuck of the bar processing machine, and the bar is held by the chuck after, during processing of the bar by bar processing machine, it has a, a step of excluding the deflection of the bar by biased in a direction to retract the bar feeding member from the bar processing machine, the bar feeding member In the step of controlling the driving means, during the processing of the bar by the bar processing machine, the driving means of the bar feeding member is controlled so as to decrease the tensile force as the advance distance of the bar feeding member increases. And
Further, the bar supply method according to the present invention is a bar supply method for supplying a bar to a bar processing machine, the step of gripping the rear end portion of the bar by the gripping means of the bar feed member, The bar is advanced by the bar feed member and biased against the stopper provided on the bar processing machine, the bar is held by the chuck of the bar processing machine, and the bar is held by the chuck A step of removing the deflection of the bar by urging the bar feed member in the direction of retreating from the bar machine during the processing of the bar by the bar processing machine; In the step of controlling the driving means, if the advance distance of the bar feed member becomes equal to or greater than a predetermined value during the processing of the bar by the bar processing machine, the bar feed member is moved in the direction of retreating from the bar processing machine. The control of the driving means is terminated. That.

  In the present invention, preferably, the bar processing machine is a main shaft moving type bar processing machine, and the bar supply machine is rotationally driven by a driving means, and converts the rotary motion into a linear motion to feed the bar. Feed member transmission device for moving the member forward or backward relative to the spindle moving bar processing machine, rotational motion converting means for converting the movement of the spindle into rotational motion, and rotation by the rotational motion converting means for the feed member transmission device Switching means for switching between transmission and interruption of movement, and during rod processing, the movement of the main shaft is converted into rotational movement by the rotational movement conversion means and transmitted to the transmission device for the feed member via the switching means, thereby Interlocking means for interlocking the material feed member with the movement of the spindle of the main spindle moving type bar processing machine, and after gripping the bar with the chuck, the switching means transmits the rotational movement from the rotational motion conversion means to the feed member When the rotational motion to the location is transmitted, it controls the driving means the bar feeding member in a direction retracting from the bar processing machine.

  According to the bar feeder according to the present invention, in the bar feeder for feeding an extremely fine bar to the bar processing machine, it is possible to remove the deflection of the bar during the bar processing.

It is a perspective view of a bar feeder according to an embodiment of the present invention. It is a schematic side view of the sending arrow by embodiment of this invention. It is a figure which shows the detail of the finger chuck by embodiment of this invention. It is a figure which shows the detail of the interlocking | linkage means by embodiment of this invention. It is a flowchart of the bar supply process which the bar supply machine by embodiment of this invention performs.

Hereinafter, a bar feeder and a bar feeding method according to an embodiment of the present invention will be described with reference to the accompanying drawings.
First, the structure of the bar feeder according to the embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a bar feeder according to an embodiment of the present invention, FIG. 2 is a schematic side view of a feeding arrow according to an embodiment of the present invention, and FIG. 3 is a finger according to an embodiment of the present invention. FIG. 4 is a diagram showing details of the chuck, and FIG. 4 is a diagram showing details of the interlocking means according to the embodiment of the present invention.

  As shown in FIG. 1, the bar feeder 2 is installed adjacent to the rear of the spindle moving type bar processing machine 4. The bar processing machine 4 includes a headstock 6 that moves back and forth during processing of the bar W, and a tool 8 for processing the bar W and a headstock 6 are provided in front of the headstock 6. And a guide bush 11 for guiding the bar W projecting forward. The cutting tool 8 is provided so as to be able to appear and retract between a stopper position that blocks the bar feeding path, a machining position near the circumferential surface of the bar W, and a retracted position. When the bar 8 is at the stopper position, the tip of the bar W is brought into contact with and stopped when the bar W is fed forward, thereby serving as a stopper. The spindle stock 6 is provided with a spindle (not shown) that is rotatable inside, and a chuck 10 that is provided at the tip of the spindle for gripping the bar W.

  Moreover, the bar feeder 2 feeds the bar W into the main shaft of the bar machine 4 (bar feed member) 12 and feeds the arrow 12 to the bar machine 4. The feed member transmission 14 for moving forward or backward, the motor 16 (drive means) for driving the feed member transmission 14, and the feed arrow 12 in conjunction with the movement of the headstock 6 during bar processing. And interlocking means 18 for making them.

  The feed arrow 12 includes a rod part 12a disposed on the bar feed axis of the bar feeder 2 and a finger chuck 12b attached to the front end of the rod part 12a. A blade portion 12 c provided at the rear end of the feed arrow 12 is connected to the feed member transmission device 14.

  As shown in FIG. 2, the finger chuck 12b includes a chuck joint 20 that is screwed to the tip of the rod portion 12a, a finger chuck body 22 that is rotatably connected to the front end 20c of the chuck joint 20, The chuck joint 20 and the finger chuck main body 22 are provided with a rotating shaft 24 that rotatably couples to each other.

The chuck joint 20 is formed in a bottomed cylindrical shape with an open front end portion 20c, and a plurality of (for example, two) steel balls 20b are formed in the hollow portion 20a of the chuck joint 20 from the bottom surface of the hollow portion 20a. They are accommodated in series along the longitudinal direction. The outer diameters of these steel balls 20b are smaller than the inner diameter of the hollow portion 20a of the chuck joint 20, and the steel balls 20b can freely rotate within the hollow portion 20a.
Further, the rotary shaft 24 is inserted into the hollow portion 20a from the front end portion 20c of the chuck joint 20, and the rear end surface of the rotary shaft 24 comes into contact with the front end portion of the foremost steel ball 20b. The outer diameter of the rotating shaft 24 is smaller than the inner diameter of the hollow portion 20a of the chuck joint 20, and the rotating shaft 24 can freely rotate within the hollow portion 20a. In a state where the rotating shaft 24 is inserted into the hollow portion 20 a of the chuck joint 20, the protrusion 20 d formed on the inner peripheral surface of the chuck joint 20 is fitted into the concave portion 24 a formed on the outer peripheral surface of the rotating shaft 24. Thus, the rotation shaft 24 can be rotated without being detached from the chuck joint 20.

The finger chuck body 22 includes a cylindrical finger chuck case 26 and an elastic finger chuck 28 accommodated in the finger chuck case 26.
The rotating shaft 24 protruding from the front end portion 20 c of the chuck joint 20 is inserted into the hollow portion 26 b from the rear end portion 26 a of the finger chuck case 26. In a state where the rotating shaft 24 is inserted into the hollow portion 26b of the finger chuck case 26, a pin hole 26c formed in the cylindrical wall surface of the finger chuck case 26, and a pin hole 24b formed near the front end portion of the rotating shaft 24 The finger chuck case 26 is fixed to the rotating shaft 24 by inserting the fixing pin 30 so as to pass through.
Furthermore, a plurality of (for example, two) steel balls 32 are accommodated in the hollow portion 26 b of the finger chuck case 26 so as to be arranged in series along the longitudinal direction from the front end surface of the rotating shaft 24. The outer diameters of these steel balls 32 are smaller than the inner diameter of the hollow portion 26b of the finger chuck case 26, and the steel balls 32 can freely rotate within the hollow portion 26b.
A front end opening 26d for receiving the rear end of the bar W into the hollow portion 26b is formed at the front end of the finger chuck case 26, and the inner diameter of the front end opening 26d is directed forward. It is formed in a tapered shape that expands.

The elastic finger chuck 28 is accommodated in front of the steel ball 32 in the hollow portion 26 b of the finger chuck case 26. The elastic finger chuck 28 is formed by integrally molding an elastic material (such as urethane resin) into a cylindrical shape.
As shown in detail in FIG. 3, a front end opening 28 a into which the rear end of the bar W is inserted is formed at the front end of the elastic finger chuck 28, and the front end opening 28 a has an inner diameter on the front side. It is formed in a tapered shape that expands toward it. The outer diameter of the front end portion 28b of the elastic finger chuck 28 is larger than the minimum inner diameter of the front end opening portion 26d of the finger chuck case 26 (that is, the inner diameter of the rear end portion of the front end opening portion 26d). The forward movement of the elastic finger chuck 28 in the hollow portion 26b is restricted. Further, the inner diameter of the front end side of the front end opening 28 a of the elastic finger chuck 28 is larger than the inner diameter of the front end opening 26 d of the finger chuck case 26. Thus, when the bar W is inserted into the front end opening 28a of the elastic finger chuck 28 through the front end opening 26d of the finger chuck case 26, the front end 28b of the elastic finger chuck 28 does not interfere with the bar W. It has become.

Further, the length L ₁ in the longitudinal direction of the elastic finger chuck 28 is shorter than the distance L ₂ between the front end of the steel ball 32 and the rear end portion of the front end opening 26 d in the hollow portion 26 _b of the finger chuck case 26. A gap A is formed before and after the finger chuck 28. Accordingly, during the processing of the bar W, when the headstock 6 of the bar processing machine 4 moves rapidly toward the bar W, the moment of inertia and mechanical play of the feed member transmission device 14 and the interlocking means 18 are increased. Due to the fact that the movement of the feed arrow 12 does not completely follow the movement of the headstock 6, even if the bar W is pushed back toward the feed arrow 12 by the headstock 6, the elasticity that grips the rear end of the bar W The finger chuck 28 can move rearward by the gap A, and the bending of the bar W can be suppressed.

The outer diameter D ₁ of the elastic finger chuck 28 is smaller than the inner diameter D ₂ of the hollow portion 26 _b of the finger chuck case 26, and the outer peripheral surface of the elastic finger chuck 28 and the inner peripheral surface of the hollow portion 26 _b of the finger chuck case 26 are A gap B is formed between the two. The gap B allows the elastic finger chuck 28 to rotate together with the bar W in the hollow portion 26 b of the finger chuck case 26, and the central axis of the bar W is fed to the headstock 6 of the bar processing machine 4. The size is approximately the same as the axis (Z-axis).
When a very thin rod W (for example, less than 1 mm in diameter) is rotated at a high speed (for example, 30000 rpm) during processing, in the structure in which the entire finger chuck body 22 rotates together with the rod W, the moment of inertia of the finger chuck body 22 The rotation of the finger chuck main body 22 is delayed with respect to the rotation of the bar W, and the bar W is twisted. However, in this embodiment, since the elastic finger chuck 28 that is light and has a small moment of inertia can rotate together with the bar W in the hollow portion 26b of the finger chuck case 26, it sufficiently follows the high-speed rotation of the bar W. It is possible to prevent the bar W from being twisted.

  As shown in FIG. 1, the feed member transmission device 14 includes a pair of feed member pulleys 34 and a feed member timing belt 36 wound around the feed member pulley 34. A lower portion 36a in which a blade portion 12c provided at the rear end of the feed arrow 12 linearly moves toward the bar processing machine 4 during feeding of the bar W among the feed member timing belt 36 that circulates and moves. Is attached to.

  The interlocking means 18 is connected to the headstock 6 of the bar processing machine 4 and performs linear motion transmission means 40 that performs linear motion in synchronization with the movement of the headstock 6, and linear motion of the linear motion transmission means 40. Rotational motion conversion means 42 for converting into rotational motion and transmitting it to the feed member pulley 34, and interposed between the rotational motion conversion means 42 and the feed member pulley 34, and the rotational motion conversion means 42 is fed to the feed member. And an electromagnetic clutch 44 for releasably connecting to the pulley 34 and a controller 46 for controlling the operation of the bar feeder 2. The controller 46 is connected to the bar processing machine 4 so that various signals can be communicated.

  The linear motion transmitting means 40 is attached to a synchronization shaft 48 that extends horizontally from the headstock 6 toward the bar feeder 2 backward, and to the base of the bar feeder 2, and the direction of movement of the headstock 6 The linear guide 50 extends parallel to the linear guide 50, and the sliding member 52 is provided so as to be slidable with respect to the linear guide 50 and is fixed to the other end of the synchronization shaft 48. The synchronization shaft 48 extends above and in parallel with the linear guide 50.

  As shown in FIG. 4, the sliding member 52 has an inverted L shape in a side view, and a rear plate portion 52 a that extends straight downward from the other end of the synchronization shaft 48 toward the linear guide 50, It has a sliding portion 52b that extends forward from the lower end of the rear plate portion 52a and slides on the linear guide 50.

  The rotational motion conversion means 42 is constituted by a conversion transmission device, and has a pair of conversion pulleys 54 provided at the front and rear, and a conversion timing belt 56 wound around the conversion pulley 54. The front conversion pulley 54 is detachably connected to the drive shaft 58 of the front feed member pulley 34 via the electromagnetic clutch 44. Furthermore, the motor 16 for driving the feed arrow 12 is connected to one end of the drive shaft 58, whereby the drive shaft 58 is rotationally driven. The upper end of the rear plate portion 52a of the interlocking means 18 is connected to the lower portion 56a of the upper portion and the lower portion of the conversion timing belt 56 that circulates and moves in a straight line.

  Next, the operation and control of the bar feeder 2 according to the present embodiment will be described with reference to FIG. FIG. 5 is a flowchart of a bar supply process performed by the bar feeder 2 according to the embodiment of the present invention. This bar supply process is repeatedly executed each time a new bar W is supplied to the bar feeder 2.

First, the feed arrow 12 stands by at the rear end side of the bar feeder 2 before the start of the bar supply process. At this time, the rear end portion of the bar W is fitted into the hollow portion of the elastic finger chuck 28 via the front end opening portion 26 d of the finger chuck case 26 and the front end opening portion 28 a of the elastic finger chuck 28. The inner wall surface of the elastic finger chuck 28 is slightly enlarged in diameter, and the rear end surface of the bar W is elastically gripped by the elastic restoring force. And is gripped rotatably. At this time, the electromagnetic clutch 44 is OFF, the connection between the conversion pulley 54 and the drive shaft 58 is released, and the conversion pulley 54 is rotatable.
When the tool 8 of the bar processing machine 4 protrudes to the stopper position and a signal indicating that the chuck 10 is opened is input from the bar processing machine 4 to the controller 46, the controller 46 starts the bar supply process. To do.

As shown in FIG. 5, when the bar supply process is started, in step S <b> 1, the controller 46 rotates the feed arrow 12 forward toward the bar processing machine 4 via the feed member transmission device 14. The motor 16 is controlled so as to generate torque in the forward direction. Thereby, the bar W is fed toward the bar processing machine 4 by the feed arrow 12.
When the bar W is pushed toward the bar processing machine 4 by the feed arrow 12 and the tip of the bar W contacts the bite 8 of the bar processing machine 4, the bar processing machine 4 closes the chuck 10 and closes the bar. While gripping the material W, a signal indicating that the chuck 10 is closed is output to the controller 46.
When the controller 46 advances the feed arrow 12 toward the bar processing machine 4, the tip of the bar W does not move away from the bite 8 when the tip of the bar W contacts the bite 8 of the bar processing machine 4. The motor 16 is controlled to advance the feed arrow 12 with a weak biasing force. As a result, the bar W is prevented from bending when the tip of the bar W is in contact with the cutting tool 8 of the bar processing machine 4 and the chuck 10 is closed and the bar W is gripped.

In step S <b> 2, the controller 46 stands by until a signal indicating that the chuck 10 is closed is input from the bar processing machine 4.
When a signal indicating that the chuck 10 is closed is input, the process proceeds to step S3, where the controller 46 turns on the electromagnetic clutch 44 and connects the conversion pulley 54 to the drive shaft 58. Thereby, the headstock 6 and the feed arrow 12 can be interlocked.

  Next, in step S4, the controller 46 controls the motor 16 so as to generate torque in the rotational direction (reverse direction) in which the feed arrow 12 is retracted from the bar processing machine 4 via the feed member transmission device 14. To do. Thereby, the rear-end part of the bar W is pulled in the direction away from the bar processing machine 4 by the feed arrow 12, and the bending of the bar W is removed.

  In step S5, the controller 46 waits until a signal indicating that the chuck 10 has been opened is input from the bar processing machine 4 after the bar processing machine 4 finishes processing the bar W.

The bar processing machine 4 processes the bar W with the cutting tool 8 while moving the headstock 6 back and forth. Meanwhile, the feed arrow 12 is interlocked with the movement of the headstock 6 by the interlocking means 18. More specifically, the synchronization shaft 48 moves with the movement of the headstock 6, whereby the sliding member 52 moves along the linear guide 50. As a result, the conversion timing belt 56 is moved via the rear plate portion 52a, and the movement is transmitted to the conversion pulley 54, the drive shaft 58, the feed member pulley 34, and the feed member timing belt 36. 12 is interlocked with the movement of the headstock 6.
When the processing of the bar W is completed, the bar processing machine 4 opens the chuck 10 to release the bar W and outputs a signal to the controller 46 that the chuck 10 has been opened.

  During the processing of the bar W, the controller 46 keeps the motor 16 generating torque in the reverse direction. Thus, while the bar W is being processed, the rear end portion of the bar W is continuously pulled in the direction away from the bar processing machine 4 by the feed arrow 12, so that the transmission member transmission device 14 and the interlocking means Even when the movement of the feed arrow 12 does not completely follow the movement of the headstock 6 due to the moment of inertia of 18 or mechanical play, the machining is performed in a state where the deflection of the bar W is always removed.

  In step S5, when a signal indicating that the chuck 10 has been opened is input from the bar processing machine 4, the process proceeds to step S6, where the controller 46 has a length of the remaining material that is longer than the length necessary for processing again. It is determined whether or not.

  As a result, when the length of the remaining material is equal to or longer than the length necessary for performing the machining again, the process proceeds to step S7, and the controller 46 controls the motor 16 so as to generate torque in the forward rotation direction.

  Next, in step S8, the controller 46 turns off the electromagnetic clutch 44 and disconnects the conversion pulley 54 and the drive shaft 58. Thereby, the bar W is fed toward the bar processing machine 4 by the feed arrow 12. Thereafter, the process returns to step S2, and the controller 46 stands by until a signal indicating that the chuck 10 is closed is input from the bar processing machine 4. Thereafter, in step S6, the processes in steps S2 to S8 are repeated until the length of the remaining material becomes less than the length necessary for processing again.

On the other hand, if the length of the remaining material is not longer than the length necessary for another machining in step S6, the process proceeds to step S9, and the controller 46 controls the motor 16 so as to generate torque in the reverse direction. Then, the feed arrow 12 is moved backward to process the remaining material.
Then, it progresses to step S10 and the controller 46 stops the motor 16 and complete | finishes a rod supply process. Thereafter, every time a new bar W is supplied to the bar feeder 2, the above bar supply process is repeatedly executed.

  As described above, according to the present embodiment, the controller 46 removes the bending of the bar W supplied to the bar processing machine 4, so that after the bar W is held by the bar processing machine 4, During the processing of the bar W, the motor 16 is controlled in a direction in which the feed arrow 12 is retracted from the bar processing machine 4, so that the rear end of the bar W is fed while the bar W is being processed. 12 continues to be pulled in a direction away from the bar processing machine 44. Thereby, it can process in the state which removed the bending of the bar W always.

  In particular, as in the present embodiment, the bar processing machine 4 is a spindle moving type bar processing machine, and when the feed arrow 12 is moved in conjunction with the headstock 6 of the bar processing machine 4, Even when the movement of the feed arrow 12 does not completely follow the movement of the headstock 6 due to the moment of inertia of the transmission device 14 or the interlocking means 18 or mechanical play, the machining is performed with the deflection of the bar W always removed. It can be carried out.

  The present invention is not limited to the above embodiments, and various modifications are possible within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

  In the present embodiment described above, it has been described that the controller 46 continues to generate torque in the reverse rotation direction during the processing of the bar W. However, for example, the feed arrow 12 specified based on the rotation angle of the motor 16 is used. Depending on the moving distance, the torque value when the motor 16 generates torque in the reverse direction may be changed. Specifically, as the processing of the bar W progresses and the length of the remaining material becomes shorter, it is considered that the deflection of the bar W becomes smaller. Therefore, as the advance distance of the feed arrow 12 increases (that is, the length of the remaining material becomes shorter). The torque value when the motor 16 generates the torque in the reverse direction may be decreased as the value becomes shorter. Further, when the advance distance of the feed arrow 12 becomes a predetermined value or more, the motor 16 may not be caused to generate torque in the reverse direction.

Further, in the bar supply process of the present embodiment, when the electromagnetic clutch 44 is OFF and the feed arrow 12 can be driven by the motor 16, the controller 46, for example, based on the rotation angle of the motor 16. May be monitored, and an alarm may be output based on the movement distance.
For example, when the processing of the bar W is started (step S1 of the bar supply process), torque is generated in the forward direction in order to feed the bar W toward the bar processing machine 4 by the feed arrow 12. When the movement distance of the feed arrow 12 is smaller than the distance required for feeding the bar W in spite of controlling the motor 16 as described above, an alarm is generated as a movement failure of the feed arrow 12.
Alternatively, when the electromagnetic clutch 44 is turned off during the processing of the bar W (step S8 of the bar supply process), the tip of the bar W is in contact with the bite 8 at the stopper position. Even if torque is generated by the motor 16, the feed arrow 12 does not move. Nevertheless, if the feed arrow 12 moves by a predetermined threshold or more, it is considered that an abnormality of the feed arrow 12 (for example, dropping of the bar W from the finger chuck 12b) has occurred, and an alarm is generated.
Further, when the electromagnetic clutch 44 is ON, the controller 46 monitors the moving distance of the feed arrow 12 and generates an alarm for notifying abnormalities such as slipping of the electromagnetic clutch 44 based on the moving distance. May be.

  Moreover, in this embodiment mentioned above, although the case where the finger chuck 12b was provided with the elastic finger chuck 28 was demonstrated, it replaced with the elastic finger chuck 28 and the outer peripheral surface of the bar W is hold | gripped from multiple directions (for example, 3 directions). You may provide the nail to do.

  Further, in the present embodiment, the case where the bar feeder 2 is used in combination with the main spindle moving bar processing machine 4 has been described. However, the bar feeder 2 according to the present embodiment is used as the main spindle fixed bar. It does not preclude use in combination with a processing machine. Even in the spindle fixed bar processing machine, the bar W may be bent by the urging force of the feed arrow 12, and the bar 16 is processed by the bar supply machine 2 according to the present embodiment. By generating a torque in the reverse direction and continuously pulling the rear end portion of the bar W away from the bar processing machine by the feed arrow 12, the processing can be performed in a state in which the deflection of the bar W is always removed. . The torque generated by the motor 16 at this time is set to such a torque that the rear end portion of the bar W is not detached from the finger chuck.

  In this embodiment, the case where the interlocking unit 18 includes the synchronization shaft 48, the linear guide 50, the sliding member 52, the pair of conversion pulleys 54, and the conversion timing belt 56 has been described. May have different configurations. For example, a movement amount of the headstock 6 may be obtained from the bar processing machine 4 or a rotary encoder, and an interlocking motor that links the feed arrow 12 with the movement of the headstock 6 based on the movement amount may be provided.

  Moreover, in this embodiment, although demonstrated that the steel ball 32 was accommodated in the hollow part 26b of the finger chuck case 26, this steel ball 32 may be abbreviate | omitted. In this embodiment, since the steel ball 32 is accommodated in the hollow portion 26b of the finger chuck case 26, when the bar W is pushed from behind by the feed arrow 12, the rear end of the elastic finger chuck 28 is steel. It contacts the sphere 32. Accordingly, even when the bar W is processed while being pushed toward the bar processing machine 4, the elastic finger chuck 28 can rotate together with the bar W in the hollow portion 26 b of the finger chuck case 26.

  Moreover, in this embodiment, although demonstrated that the bar processing machine 4 had the guide bush 11, it does not need to have the guide bush 11. FIG.

Further, in the bar supply process of the present embodiment, it has been described that the motor 16 is controlled to generate torque in the reverse direction in step S4 after the electromagnetic clutch 44 is turned on in step S3. However, steps S3 and S4 are described. The order may be changed.
Further, although it has been described that the motor 16 is controlled to generate torque in the forward rotation direction in step S7 and the electromagnetic clutch 44 is turned off in step S8, the order of steps S7 and S8 may be changed.

  Further, in the present embodiment, the electromagnetic clutch 44 is described as connecting the rotational motion converting means 42 to the feed member pulley 34 so as to be freely disengaged, but an air cylinder may be used instead of the electromagnetic clutch 44. Alternatively, transmission and interruption of the rotational motion by the rotational motion converting means 42 for the feed member pulley 34 may be switched by electrical control of the motor 16.

2 Bar feeder 4 Spindle moving type bar processing machine 6 Spindle base 8 Byte (stopper)
10 Chuck 12 Feeding arrow (Bar feed member)
12b Finger chuck (gripping means)
14 Transmission device for feed member 16 Motor (drive means)
18 interlocking means 22 finger chuck main body 26 finger chuck case 26b hollow portion 26d front end opening 28 elastic finger chuck (gripping member)
28a Front end opening 28b Front end 34 Feed member pulley 36 Feed member timing belt 42 Rotational motion conversion means 44 Electromagnetic clutch (switching means)
46 Controller (drive control means)
W Bar material

Claims (9)

A bar feeder that feeds a bar to a bar processing machine,
A bar feed member for moving the bar relative to the bar processing machine, comprising gripping means for gripping the rear end of the bar;
Drive means for driving the bar feed member back and forth with respect to the bar processing machine;
During the processing of the bar by the bar processing machine, the drive in the direction in which the bar feed member is retracted from the bar processing machine so as to apply a tensile force to the bar in order to eliminate the bending of the bar. It possesses a drive control means for controlling the means,,
The drive control means controls the drive means so as to decrease the tensile force as the advance distance of the bar feed member increases during the bar processing by the bar processing machine.
This is a bar feeder. A bar feeder that feeds a bar to a bar processing machine,
A bar feed member for moving the bar relative to the bar processing machine, comprising gripping means for gripping the rear end of the bar;
Drive means for driving the bar feed member back and forth with respect to the bar processing machine;
During the processing of the bar by the bar processing machine, the drive in the direction in which the bar feed member is retracted from the bar processing machine so as to apply a tensile force to the bar in order to eliminate the bending of the bar. Drive control means for controlling the means,
The drive control means is configured to retract the bar feed member from the bar processing machine when a forward distance of the bar feed member becomes a predetermined value or more during processing of the bar by the bar processing machine. End control of the drive means to
This is a bar feeder. The bar processing machine is a spindle moving type bar processing machine,
A transmission device for a feed member that is rotationally driven by the drive means, converts the rotational motion into a linear motion, and moves the bar feed member forward or backward relative to the main spindle moving bar processing machine;
A rotary motion conversion means for converting the movement of the main shaft into a rotary motion; and a switching means for switching transmission and interruption of the rotary motion by the rotary motion conversion means to the transmission device for the feed member, and during the bar processing, the main shaft Of the main shaft of the main shaft moving type bar processing machine by converting the movement of the main shaft into a rotational motion by the rotary motion converting means and transmitting the movement to the transmission device for the feed member via the switching means. Interlocking means for interlocking with movement,
The drive control means applies a tensile force to the bar in order to eliminate the bending of the bar when the rotary movement is transmitted from the rotary movement conversion unit to the transmission member transmission device by the switching unit. The bar feeder according to claim 1 or 2 , wherein the driving means is controlled in a direction in which the bar feeder is retracted from the bar processing machine. The bar supply machine according to claim 1 or 2 , wherein the bar processing machine is a spindle fixed bar processing machine. A bar feeder that feeds a bar to a bar processing machine,
A bar feed member for moving the bar relative to the bar processing machine, comprising gripping means for gripping the rear end of the bar;
Drive means for driving the bar feed member back and forth with respect to the bar processing machine;
During the processing of the bar by the bar processing machine, the drive in the direction in which the bar feed member is retracted from the bar processing machine so as to apply a tensile force to the bar in order to eliminate the bending of the bar. Drive control means for controlling the means,
It said gripping means includes a finger chuck casing that is attached to the front end of the have a hollow portion capable of receiving the rear end portion of the bar the bar feeding member, in the hollow portion of the finger chuck casing, said rod A cylindrical gripping member for gripping the rear end of the rod , and the gripping member is rotatable about the longitudinal axis of the bar feed member during processing of the bar by the bar processing machine , And it is provided to be movable in the longitudinal direction in the hollow portion of the finger chuck case.
This is a bar feeder. The front end of the finger chuck case is formed with an opening for receiving the rear end portion of the bar into the hollow portion, and the opening into which the rear end of the bar is inserted into the front end of the gripping member The bar feeder according to claim 5 , wherein an inner diameter of a front end side of the opening of the gripping member is larger than an inner diameter of a rear end side of the opening of the finger chuck case. A bar supply method for supplying a bar to a bar processing machine by a bar supply machine,
Gripping the rear end of the bar by means of the bar feed member of the bar feeder, and
A step of advancing a bar by the bar feed member and biasing the stopper against a stopper provided in the bar processing machine;
Gripping the bar with the chuck of the bar processing machine;
After the bar is gripped by the chuck, the bar feed member is attached to the bar so as to apply a tensile force to the bar in order to remove the deflection of the bar during the bar processing by the bar processing machine. in a direction retracting from the wood processing machine, it has a, and controlling the drive means of the bar feeding member,
In the step of controlling the driving means of the bar feed member, during the bar processing by the bar processing machine, the bar feed is made so that the tensile force decreases as the advance distance of the bar feed member increases. Controlling the drive means of the member ,
A bar supply method characterized by the above. A bar supply method for supplying a bar to a bar processing machine by a bar supply machine,
Gripping the rear end of the bar by means of the bar feed member of the bar feeder, and
A step of advancing a bar by the bar feed member and biasing the stopper against a stopper provided in the bar processing machine;
Gripping the bar with the chuck of the bar processing machine;
After the bar is gripped by the chuck, the bar feed member is attached to the bar so as to apply a tensile force to the bar in order to remove the deflection of the bar during the bar processing by the bar processing machine. A step of controlling the drive means of the bar feed member in the direction of retreating from the material processing machine,
In the step of controlling the drive means of the bar feed member, when the advance distance of the bar feed member becomes a predetermined value or more during the bar processing by the bar processing machine, the bar feed member is End the control of the drive means in the direction of retreating from the bar processing machine,
  A bar supply method characterized by the above. The bar processing machine is a spindle moving type bar processing machine,
The bar feeder is
A transmission device for a feed member that is rotationally driven by the drive means, converts the rotational motion into a linear motion, and moves the bar feed member forward or backward relative to the main spindle moving bar processing machine;
A rotary motion conversion means for converting the movement of the main shaft into a rotary motion; and a switching means for switching transmission and interruption of the rotary motion by the rotary motion conversion means to the transmission device for the feed member, and during the bar processing, the main shaft Of the main shaft of the main shaft moving type bar processing machine by converting the movement of the main shaft into a rotational motion by the rotary motion converting means and transmitting the movement to the transmission device for the feed member via the switching means. Interlocking means for interlocking with movement,
After the bar is gripped by the chuck, the bar feed member is retracted from the bar processing machine when the rotary movement is transmitted from the rotary movement converting means to the feed member transmission device by the switching means. The bar supply method according to claim 7 or 8 , wherein the driving means is controlled in a direction to be moved.

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