JP2010269388A - Bar feeding device for bar cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bar feeding device for a bar cutter which can accurately cut a material with a precise cutting length at low cost without labor and waste and can be accurately maintained. <P>SOLUTION: The bar feeding device for the bar cutter includes a reach sensor 6 for outputting a reach signal at a cutting spot when an end of a bar 2 comes into contact therewith in a termination spot spaced by a cutting dimension from a cutting surface to a bar discharge side on a feed rail R and a feed amount sensor 7 for outputting a feed amount of the bar 2 passing a length measuring spot at the length measuring spot spaced by a fixed distance from the cutting surface in which the bar 2 is cut to a bar supply side on the feed rail R. The bar feeding device for the bar cutter includes a feed control means of a pinch roller 3 for outputting an acceleration command during a start of a feed operation, a constant velocity command during the reach of a maximum speed, a deceleration command before the completion of the feed operation and a stop command in accordance with the cutting dimension, the feed amount and the reach signal as deciding materials. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bar feeder for a bar cutting machine (hereinafter referred to as a cutting machine).

  A conventional cutting machine is equipped with a pinch roller or the like that feeds material to a die set portion of a cutting machine body (see, for example, Patent Document 1 below).

Furthermore, as a technique for preventing the occurrence of slip scratches on the outer periphery of the material due to the pinch roller slipping in relation to the material, a technique equipped with an air clutch that stops the pinch roller is actually employed.
This method is to stop rotation of the pinch roller relative to the surface of the material by slipping the air clutch in relation to the drive shaft of the pinch roller when the material hits the stopper and stops. It is.

Utility Model Registration No. 3083912

However, the conventional machine has the following problems.
That is, first, there is a problem that the cutting accuracy is affected by the noise when the material hits the stopper and the rebound of the material.
Secondly, the air clutch adopts a structure that stops the rotation of the pinch roller by creating a half-clutch state by adjusting the set pressure of the clutch, but the air clutch lining wears quickly and repeatedly, In order to suppress the heat generation of the lining portion accompanying the maintenance of the half-clutch state, a cooling measure is required, and there is a problem that labor and cost increase.

  The present invention has been made in view of the above circumstances, and is a rod feeder for a cutting machine that can cut a material without waste with an accurate cutting length without labor and cost. For the purpose of provision.

  The bar feeder for a cutting machine according to the present invention, which has been made to solve the above-mentioned problems, is a cutting machine in which a bar is fed by a pinch roller in the longitudinal direction intermittently at a cutting dimension with the cutting timing of the cutting machine interposed therebetween. In a bar feeder for a machine, an arrival signal that arrives at a dead end point separated from the cut surface on the feed trajectory by the cut dimension from the cut surface by contact of the tip of the bar is issued. Feed amount that outputs the feed amount of the bar that has passed through the measuring point at a measuring point that is equipped with a sensor and is separated by a certain distance from the cutting surface where the bar is cut on the feed track to the bar supply side Feed control with sensor, which uses cutting dimensions, feed amount, and arrival signal as judgment materials and issues acceleration command at the start of feed operation, constant speed command at maximum speed arrival, deceleration command before completion of feed operation, and stop command And the acceleration command Speed control means that performs acceleration control on the drive means, receives constant speed command to perform constant speed control on the drive means, receives deceleration command and performs deceleration control on the drive means, and acceleration command, constant speed command, or deceleration command In response, the torque amount of the drive means is set to a torque amount that is equal to or greater than the static torque amount, the stop command is received, and the torque amount of the pinch roller is reduced to reduce the output torque of the drive means, thereby reaching a dead end point. Torque control means for setting the amount of static torque with respect to the surface of the bar that has reached

  Here, the static torque amount is equal to or less than the maximum torque amount that the pinch roller keeps relatively non-rotating with respect to the surface of the bar member that is in contact with the stopper and is stationary, and is separated from the stopper. More than the minimum amount of torque required to exert a force to advance along the feed track for a bar that is not stationary.

  A correction sensor that detects the passage of the tip of the bar at the correction reference point that is a reference dimension away from the arrival sensor on the feed trajectory to the bar supply side, detects the terminal from the arrival sensor on the feed trajectory to the bar supply side It is equipped with a terminal detection sensor that detects the passage of the tip and end of the bar at a correction reference point that is separated by the reference dimension and separated from the cut surface on the feed track to the bar supply side by more than the cutting dimension. Feed amount correcting means for correcting the feed amount output by the feed amount sensor by comparing the size corresponding to the feed amount from the detection of the passage of the tip of the wire to the detection of the arrival signal with the reference dimension And the total length of the in-process bar due to the difference between the dimension corresponding to the feed amount from when the terminal detection sensor detects the end of the bar until the arrival signal is detected and the end detection reference dimension As well as all It may be bar feeder for cutting machine having a dimension calculation means for deriving a dimension of dividing by the number of cuts and a residual scrap cutting dimensions.

  The present invention includes torque control means for setting the torque amount of the pinch roller to a static torque amount with respect to the surface of the bar material that has reached the dead end point by lowering the output torque of the drive means. As a result, an air clutch becomes unnecessary, and the feed amount of the bar can be directly derived from the rotation of the driving means. In addition, the torque control response is good, and the torque that keeps pressing the bar against the stopper after reaching the stopper is accurately managed by the amount of static torque, so that variations in the length (weight) of the cut product can be reduced. .

  A feed control means for issuing an acceleration command at the start of the feed operation, a constant speed command at the time of reaching the maximum speed, a deceleration command before the completion of the feed operation, and a stop command, using the cutting dimensions, feed amount, and arrival signal as judgment materials, and acceleration By receiving a command to perform acceleration control on the drive means, receive a constant speed command to perform constant speed control on the drive means, and receive speed reduction control to perform deceleration control on the drive means, it is on the verge of hitting the stopper The bar that has slowed down softly touches the stopper. As a result, it goes without saying that the collision noise is reduced, and the rebound of the bar due to the presence of the stopper is reduced, and the variation in the length (weight) of the cut product can be reduced.

  At the dead end point that is separated from the cut surface by the cutting dimension to the bar discharge side, an arrival sensor that issues an arrival signal to the cutting point by contacting the tip of the bar is provided, and from the arrival sensor to the bar supply side A correction sensor that detects the passage of the end of the bar at a correction reference point that is separated by the reference dimension, and the feed amount from when the end of the bar is detected by the correction sensor until the arrival signal is detected By providing a feed amount correction means that corrects the feed amount output by the feed amount sensor by comparing the dimension corresponding to the reference dimension with the reference dimension, the error of the feed amount versus the dimension caused by the wear of the pinch roller is automatically detected. Can be resolved.

  A terminal detection sensor that detects the passage of the end of the bar is provided at a correction reference point that is separated from the arrival sensor by the end detection reference dimension to the bar supply side, and the terminal detection sensor detects the passage of the end of the bar. The total length of the bar in progress is calculated by the difference between the dimension corresponding to the feed amount from when the arrival signal is detected to the end detection reference dimension, and the total number of cuts is calculated by dividing the total length by the cutting dimension. By providing a dimension calculation means for deriving the dimensions of the remaining end material, it is always set even if there is a variation in the length of the bar material introduced into the feed track while recognizing the total length of the in-process bar material. It can be used without waste according to the cut dimensions.

It is explanatory drawing which shows an example of operation | movement of the bar feeder for cutting machines by this invention. It is explanatory drawing which shows an example of operation | movement of the bar feeder for cutting machines by this invention. It is a block diagram which shows an example of the control system of the bar feeder for cutting machines by this invention. It is a flowchart which shows an example of the control form of the control system of the bar feeder for cutting machines by this invention. It is a side view which shows an example of the bar feeder for cutting machines by this invention. It is a top view which shows an example of the bar feeder for cutting machines by this invention. It is a front view which shows an example of the bar feeder for cutting machines by this invention. It is a time versus speed figure which shows the example of the control form of the bar feeder for cutting machines by this invention. It is a time versus torque figure which shows the example of the control form of the bar feeder for cutting machines by this invention. It is explanatory drawing which shows an example of sensor arrangement | positioning of the bar feeder for the conventional cutting machine.

Embodiments of a bar feeder for a cutting machine (hereinafter referred to as a feeder) according to the present invention will be described below with reference to the drawings.
The feeding device shown here is a device arranged in the preceding stage of the die set unit 1 of the cutting machine, and the cutting time of the bar 2 by the cutting machine is interposed as a stop time, and intermittently at predetermined cutting dimensions. It is a device that feeds bars in the longitudinal direction.

  The feeding device of this example includes a stacking base (not shown) for supplying the bar 2 to the feed track R composed of the pinch rollers 3, and the feed bar (not shown) of the stacking base is operated to operate the bar. 2 is placed on the feed trajectory R of the feeder.

  In the feeding device shown here, a pair of upper and lower pinch rollers 3 are arranged horizontally on the front and rear of a frame 4, and the bar material 2 is discharged from the servo motor as the driving means 5 by the four pinch rollers 3 via a sprocket and a belt. An equal driving force is applied to each side (direction toward the die set portion of the cutting machine: arrow direction in the figure) (FIGS. 5 to 7). The pair of upper and lower pinch rollers 3 are supported so as to be close to and separated from each other so that the bar 2 can be clamped or released.

  This feed device functions as a stopper at a dead end point on the feed track R that is separated from the cut surface where the bar 2 is cut to the bar discharge side by the cutting dimension, and at the tip of the bar 2 An arrival sensor 6 that emits an arrival signal indicating that the cutting point has been reached by contact or pressurization is provided as a part of the die set unit 1 (see FIG. 1A). A feed amount sensor 7 that outputs a feed amount of the bar 2 that has passed through the length measurement point is provided at a length measurement point that is a predetermined distance away (in the direction opposite to the bar discharge side).

  The arrival sensor 6 in the example is a contact sensor, a pressure sensor, or the like that can function as a stopper, and is a sensor that outputs an arrival signal when contact or pressure is detected. In accordance with the rotation of the pinch roller 3, a rotary encoder, a photoelectric sensor or the like that outputs the rotation amount as a feed amount.

The example further includes a correction sensor 8 that detects passage of the tip of the bar 2 and a terminal detection sensor 9 that detects passage of the tip and end of the bar 2.
The correction sensor 8 is arranged at a correction reference point of the frame 4 on the feed trajectory R that is a reference distance away from the arrival sensor 6 toward the bar supply side (see FIG. 1C), and the terminal detection sensor 9 is The frame 4 on the track R is separated from the arrival sensor 6 to the bar supply side by the end detection reference dimension, and is a point on the bar supply side of the pinch roller, from the cut surface on the feed track R to the bar supply side It arrange | positions in the terminal detection reference point separated more than the cutting | disconnection dimension (refer FIG.2 (C)).

  The correction sensor 8 and the terminal detection sensor 9 in this example are sensors that can reliably detect a break in the bar 2 and output a reference dimension measurement signal or a terminal detection signal, respectively, Sensors, ultrasonic sensors, and the like.

This feed device has a feed control means 10 that controls the operation of the pinch roller 3.
In order to control the feed amount of the bar 2, the feed control means 10 includes an arrival signal and feed amount, which are outputs of the various sensors, a reference dimension measurement signal, and a terminal detection signal, in addition to the preset cutting dimensions. As judgment materials, an acceleration command at the initial movement of the feed operation, a constant speed command when the maximum speed is reached, a deceleration command before the completion of the feed operation, and a stop command are issued (see FIG. 3).

  In this example, an acceleration command is received from the feed control means 10 to perform acceleration control on the driving means 5, a constant speed command is received to perform constant speed control on the driving means, and a deceleration command is received to receive deceleration control on the driving means 5. The speed control means 11 for performing

  The acceleration control and deceleration control in this example are acceleration control and deceleration control based on constant acceleration, and are performed by increasing or decreasing the voltage or frequency supplied to the drive means 5. The longest acceleration time and the longest deceleration time are set to 0.2 seconds, for example, and the acceleration at the time of acceleration and deceleration is made equal, and the maximum speed when the rod 2 is advanced along the feed trajectory R is, for example, 60 m / Seconds are set (see FIG. 8). If the maximum speed is not reached according to the cutting dimensions, deceleration control is performed without waiting for the maximum speed to be reached (A-E-F in FIG. 8). Constant speed control is performed (A-B-C-D in FIG. 8).

In the control for feeding the bar 2 in this example, the time point at which the acceleration control is terminated and the time point at which the deceleration control is started are derived as follows.
In this example, the acceleration time and the deceleration time are given equally as described above (AB and CD in FIG. 8, and AE and EF).
Specifically, the dimension corresponding to the feed amount for the acceleration time and the deceleration time is subtracted from the cutting dimension, and the feed rate corresponding to the remaining dimension is controlled at a constant speed (B-C in FIG. 8). That is, the end point of the acceleration control is a point when the feed amount in the acceleration time is detected (point B in FIG. 8), and the start point of the deceleration control is a feed amount obtained by adding the feed amount at the constant speed control. This is the time of detection (point C in FIG. 8).

  Further, in this example, in response to an acceleration command, a constant speed command, or a deceleration command from the feed control means 10, feed torque control is performed to set the torque amount of the drive means 5 to a torque amount equal to or greater than the static torque amount. In response to the stop command accompanying the detection of the signal, the torque amount of the pinch roller 3 is set to the static torque amount with respect to the side surface of the bar 2 that has reached the dead end point by reducing the output torque of the driving means 5. Torque control means 12 that performs stop torque control is provided (see FIGS. 9A and 9B).

The torque control in this example is performed by increasing or decreasing the current supplied to the drive means 5.
The feed torque control is started in response to a cutting time end signal from the cutting machine (point A in FIG. 9). The end of the feed torque control and the start time of the stop torque control are determined by releasing the deceleration command or stopping the stop command. It is the time of receiving (D point or F point in FIG. 8).

As described above, in the control of feeding the bar 2 that repeats the acceleration process, the constant speed process, and the deceleration process intermittently with the cutting time as the stop torque process, the location of the bar 2 in the feed track R, the feed The detection of the size of the bar 2 is an important process.
Hereinafter, the dimension detection process will be described in detail (see FIG. 3).

The terminal detection sensor 9 detects the passage of the end of the bar 2 and outputs an end detection signal. The feed amount sensor 7 receives the end detection signal and starts measuring the feed amount (see FIG. 2B), and measures and outputs the feed amount until the tip of the bar 2 reaches the stopper (see FIG. 2). 2 (C)).
The dimension calculation means 13 calculates the total length of the in-process bar 2 based on the difference between the dimension corresponding to the feed amount from when the end detection signal is detected until the arrival signal is detected and the end detection reference dimension. At the same time, the total number of times is divided by the cutting size to derive the number of cuttings and the size of the remaining end material B.

The pinch roller 3 that feeds a large number of rods 2 has a circumferential length that changes due to wear, and changes in dimensions relative to the feed amount according to the operation period.
This feeding device is provided with a feeding amount correcting means 14 for correcting such a change with time.

  The correction sensor 8 detects the passage of the tip of the bar 2 and outputs a reference dimension measurement signal. The feed amount sensor 7 receives the reference dimension measurement signal, starts measurement of the feed amount by the feed amount sensor 7 (see FIG. 1B), and determines the feed amount until the tip of the bar 2 reaches the stopper. Measure and output (see FIG. 1C).

  The feed amount correction means 14 compares the size corresponding to the feed amount from the detection of the reference dimension measurement signal to the detection of the arrival signal with the reference dimension, and the dimension per unit feed amount, and By deriving the feed amount per unit dimension and then adopting these relationships, the feed amount output by the feed amount sensor 7 for each unit quantity (single or plural) of the bar 2 introduced into the feed track R is determined. Perform dimension correction.

The bar 2 is cut as follows by the feeder configured as described above (see FIG. 4).
When the bar 2 is loaded on the loading table and the material set button is set to “ON”, the bar 2 is supplied onto the feed roller from the loading table, and the bar 2 is sent to the pinch roller 3 at an initial speed.

The feed control means 10 receives the end detection signal to detect the insertion of the bar 2 and arranges the pinch roller 3 at a position where the bar 2 can be clamped (see FIG. 1A). The pinch roller 3 that clamps the bar 2 feeds the bar 2 at an initial speed.
Subsequently, the feed control means 10 receives the reference dimension measurement signal output from the correction sensor 8, detects that the tip of the bar 2 has passed the position of the correction sensor 8, and sets the feed amount correction means 14 as described above. Function as shown (see FIG. 1B).

Further, the feed control means 10 receives the arrival signal output from the arrival sensor 6, detects that the tip of the bar 2 has reached the stopper, and the feed amount correction means 14 corrects the pinch roller 3 as described above. The value (feed amount vs. dimension coefficient, etc.) is set in an updated form, and the feed roller and pinch roller 3 are stopped (see FIG. 1C).
This completes the setting of the bar 2 newly introduced to the feed track R by the pinch roller 3.

  Thereafter, control for feeding the bar 2 for the cutting dimension is performed as many times as calculated by the dimension calculator 13 as described above in accordance with the dimensions of the introduced bar 2, and the remaining end B is fed by the pinch roller 3 The gas is discharged from R (see FIG. 2).

1 die set, 2 bar, 3 pinch roller, 4 frame, 5 drive means,
6 arrival sensor, 7 feed amount sensor, 8 correction sensor, 9 terminal detection sensor,
10 feed control means, 11 speed control means, 12 torque control means,
13 Dimension calculation means, 14 Feed amount correction means,
R feed trajectory, B end material,

Claims (2)

In a bar feeder for a cutting machine that feeds a bar (2) with a pinch roller in the longitudinal direction intermittently at every cutting dimension with the cutting time of the cutting machine,
An arrival sensor (6) that emits an arrival signal to the cutting point by the contact of the tip of the bar (2) at a dead end point separated from the cut surface on the feed track (R) by the cutting dimension toward the bar discharging side. )
The feed amount of the bar (2) that has passed through the measurement point at a measurement point that is a fixed distance away from the cut surface on which the bar (2) is cut on the feed track (R). A feed amount sensor (7) for outputting
Feed control means (10) for issuing an acceleration command at the start of the feed operation, a constant speed command at the time of reaching the maximum speed, a deceleration command before the completion of the feed operation, and a stop command, using the cutting dimension, feed amount, and arrival signal as judgment materials When,
A speed control means that performs acceleration control on the driving means (5) in response to an acceleration command, performs constant speed control on the driving means (5) in response to a constant speed command, and performs deceleration control on the driving means in response to a deceleration command ( 11) and
In response to the acceleration command, constant velocity command, or deceleration command, the torque amount of the drive means (5) is set to a torque amount equal to or greater than the static torque amount, and the torque command of the pinch roller (3) is received in response to the stop command. Torque control means (12) for setting the amount of static torque with respect to the surface of the bar (2) that has reached the dead end point by lowering the output torque of the drive means (5);
A bar feeder for a cutting machine. A correction sensor (8) for detecting the passage of the tip of the bar (2) is provided at a correction reference point separated from the arrival sensor (6) on the feed trajectory (R) by a reference dimension toward the bar supply side,
A correction reference point separated from the arrival sensor (6) on the feed trajectory (R) by the terminal detection reference dimension to the bar supply side and separated from the cut surface on the feed trajectory (R) by the cut dimension to the bar supply side. , Comprising a terminal detection sensor (9) for detecting passage of the tip and end of the bar (2),
The feed sensor (7) is compared with the reference dimension and the dimension corresponding to the feed amount from when the correction sensor (8) detects the passage of the tip of the bar (2) until the arrival signal is detected. Feed amount correction means (14) for correcting the feed amount output by
The end detection sensor (9) detects the passage of the end of the bar (2) and the difference between the end detection reference dimension and the dimension corresponding to the feed amount from when the arrival signal is detected. Dimension calculating means (13) for calculating the total length of the bar (2) and dividing the total length by the cutting dimension to derive the number of cuttings and the size of the remaining end material (B);
A bar feeder for a cutting machine according to claim 1.

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