JP5122329B2 - Dynamic brake module and servo press - Google Patents

Description

  The present invention relates to a dynamic brake module and a servo press provided with the same.

  2. Description of the Related Art Conventionally, a mechanical press that transmits the power of a motor to a slide via a power transmission device that includes a clutch and a link mechanism is known. Such a press is provided with a mechanical brake device, and in the case of a set point stop during a continuous process (for example, top dead center stop), one cycle stop, a stop during inching operation, etc. And the sliding force is mechanically stopped by generating a frictional force between the friction plate and the disk by the spring force of the brake device. The performance of the mechanical press is monitored by confirming the time and coasting distance (angle) from when the brake operation is performed until the slide actually stops.

  On the other hand, in the servo press that has been widely used in recent years, although a mechanical brake device is provided, when the slide is stopped in the normal state described above, it is the mainstream to stop the slide by servo control. The brake device is not activated each time. That is, the brake device is used for holding so as not to drop the slide in a situation where the servo control is stopped as in an emergency stop. Further, the servo press is provided with a dynamic brake (electric braking) that operates in accordance with the stop of servo control. This dynamic brake is also not activated when the slide stops under normal conditions.

  The dynamic brake (hereinafter sometimes abbreviated as DB) absorbs torque by causing the servo motor to generate power in a situation where servo control is not performed, and uses the DB circuit to generate Joule heat generated by the servo motor. A braking force is generated by converting into and releasing the. For this reason, a resistor for converting electrical energy into thermal energy is provided in the DB circuit (for example, Patent Document 1).

JP 2002-369564 A

  However, in the servo press, since normal slide stop is performed by servo control, there is very little opportunity to check the braking performance by operating a mechanical brake device or a dynamic brake. Nevertheless, with regard to mechanical brake devices, it is possible to monitor the braking performance by checking the same as with conventional mechanical presses, but in reality the braking performance monitoring method using dynamic brakes has not yet been established. is there. For this reason, if the resistance value of the resistor provided in the DB circuit is lowered due to aging, and if it is not noticed, the dynamic brake does not operate effectively in an emergency when servo control is not performed. There is a problem.

  An object of the present invention is to provide a dynamic brake module capable of satisfactorily monitoring the braking performance of a dynamic brake and a servo press equipped with the same.

  The dynamic brake module according to the present invention includes a resistor that consumes electric energy and converts it into heat energy, an input-side contact provided on the input side of the electric energy, and a resistor side provided on the resistor side A contact switch, a brake switch that opens and closes between the input side contact and the resistor side contact, a resistance value measurement contact provided for measuring a resistance value of the resistor, and the brake switch. A resistance value measuring switch for closing the resistor side contact and the resistance value measuring contact when the brake switch is in an open state; and an output terminal electrically connected to the resistance value measuring contact. It is characterized by being.

  The servo press according to the present invention includes a servo module that generates drive power based on a drive command, a servo motor that is driven by drive power from the servo module, a slide that is driven by output torque of the servo motor, and the servo And the aforementioned dynamic brake module connected to a power line between the servo motor and the module.

  The servo press of the present invention also includes a control device that outputs the drive command to the servo module, and a display device connected to the control device, and the control device is obtained via the output terminal. A resistance value measuring means for measuring the resistance value of the resistor, a resistance value comparing means for comparing the measured resistance value with a preset resistance threshold, and a warning based on the comparison result of the resistance value comparing means And a warning information generating means for generating the information and outputting the warning information to the display device for display.

  In the above, according to the dynamic brake module of the present invention and the servo press provided with the dynamic brake module, since the dynamic brake module is provided with the output terminal for measuring the resistance value of the resistor, the resistor is connected via the output terminal. By measuring the resistance value, the deterioration state of the resistor can be determined, and the braking performance of the dynamic brake using the dynamic brake module can be monitored well.

  Also, in the servo press of the present invention, when the deterioration state of the resistor is judged by each means of the control device and the warning information is displayed on the display device when it is deteriorated, the servo press operator can be displayed. The replacement time of the resistor can be notified in a timely manner, and the replacement work can be promoted.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of a servo press 1 in which a dynamic brake module (hereinafter referred to as a DB module) 20 according to the present embodiment is used. FIG. 2 is a block diagram specifically showing an NC (Numerical Control) device 2 and a DB module 20 of the servo press 1.

  In FIG. 1, a servo press 1 includes an NC device 2 that outputs a drive command based on a press motion program, a servo module 3 that generates a three-phase drive current based on a drive command from the NC device 2, and a drive current. A servo motor 4 to be driven, a speed reducer 5 that transmits the output torque of the servo motor 4, a lifting device 6 that is driven by torque from the speed reducer 5, and a slide 7 that is driven up and down by the lifting device 6 And an upper mold (not shown) is attached to the slide 7.

  The servo press 1 is provided with a lower mold as well as a crown that supports the servo motor 4, the speed reducer 5, and the lifting device 6, a plurality of uprights that support the crown, a bed on which the uprights are erected. Although it is configured including a bolster or the like, these are the same as those generally applied to a press machine, and thus illustration and description thereof are omitted here.

The NC device 2 displays an operation panel for operating the slide 7 in various modes, a press motion program, various setting information in the servo press 1, operation instruction information, warning information, and the like. A device 8 is provided.
The servo module 3 is a circuit component in which an inverter circuit is formed, and includes a plurality of switching elements, a free wheel diode, and the like.

  The servo motor 4 is provided with an encoder 9 that detects the rotation angle of the output shaft and the like and feeds back the detection result to the NC device 2. A drive command corresponding to the deviation between the detection result from the encoder 9 and the target value by the press motion program is output from the NC device 2 to the servo module 3. That is, in the servo motor 4, the slide 7 is operated by servo control based on position (angle) feedback from the encoder 9.

In the present embodiment, the speed reducer 5 may be a constant speed reducer using a plurality of stages of reduction gears, a Whitworth speed reducer with an inconstant speed of one rotation, or the like.
As the elevating device 6, a configuration including an eccentric drum 62 having an eccentric shaft 61 and a connecting rod 63 disposed on the outer peripheral side of the eccentric drum 62 can be adopted.

  By the way, in the servo press 1 of this embodiment, since the slide 7 is operating by servo control, the stop of the slide 7 is also performed by servo control. For this reason, the servo press 1 requires a means for preventing the slide 7 from being stopped on the spot in an emergency where servo control is not performed, and the brake device 10 that mechanically stops the slide 7. , And a DB module 20 for electrically braking the slide 7 is provided.

  The brake device 10 may have an arbitrary structure. For example, a configuration in which a disk rotating integrally with the eccentric shaft 61 is sandwiched between friction plates by a spring force and stopped can be employed. When the NC device 2 determines that a situation in which servo control is not performed has occurred, an operation signal from the NC device 2 is output to the brake device 10, and the brake device 10 is activated in response to this operation signal.

  As shown in FIG. 2, the DB module 20 is a circuit component in which a DB circuit is formed, and the nine relay contacts 21 to 29 and the resistors connected in parallel to the fourth to sixth relay contacts 24 to 26 side. 3 to 33 are provided.

  The first relay contact 21 of the DB module 20 is connected to a power line U that supplies power from the servo module 3 to the servo motor 4, the second relay contact 22 is connected to the power line V, and the third relay contact 23 is connected to the power. Connected to line W. The first to third relay contacts 21 to 23 are provided with first to third relay switches 41 to 43 that are closed when the current to the relay coil 30 is interrupted.

  Therefore, when the servo control is not performed and the current to the relay coil 30 is interrupted, the first and fourth relay contacts 21 and 24 are connected by the first relay switch 41 and the second relay switch 42 The fifth relay contacts 22 and 25 are connected, and the third and sixth relay contacts 23 and 26 are connected by the third relay switch 43. As a result, the electric energy regenerated by the servo motor 4 flows to the resistors 31 to 33 via the power lines U, V, and W, and is converted into heat energy by the resistors 31 to 33, so that the dynamic brake is applied. Operate.

  Further, the DB module 20 of the present embodiment is provided with a pair of output terminals 34 and 35. One output terminal 34 is connected to the seventh relay contact 27, and the other output terminal 35 is connected to the eighth and ninth relay contacts 28 and 29. The seventh to ninth relay contacts 27 to 29 are provided with fourth to sixth relay switches 44 to 46 that operate in synchronization with the first to third relay switches 41 to 43.

  When the first to third relay switches 41 to 43 are in an open state (off state), that is, when servo control is normally performed and current is supplied to the relay coil 30, the fourth to sixth relay switches 44 to 46 connect the fourth and seventh relay contacts 24 and 27, the fifth and eighth relay contacts 25 and 28, and the sixth and ninth relay contacts 26 and 29, respectively (shown in FIG. 2). State).

  With such a configuration, it is possible to output the combined resistance value of the resistors 31 to 33 between the output terminals 34 and 35 while the servo control is normally performed. This resistance value is output from the output terminals 34 and 35 to the NC device 2 through the output lines L1 and L2, and is measured.

  Although illustration is omitted, the DB module 20 recognizes whether the first to third relay switches 41 to 43 are in a closed state or whether the fourth to sixth relay switches 44 to 46 are in a closed state. An auxiliary contact is provided to allow the NC device 2 to determine which closed state it is in.

  On the other hand, the NC device 2 includes a resistance value measuring unit 51, a resistance value comparing unit 52, and a warning information generating unit 53. These means 51 to 53 are configured by appropriate hardware such as a computer and software including a computer program.

The resistance value measuring means 51 has a function of constantly measuring the resistance value between the output terminals 34 and 35 of the DB module 20, that is, the resistance value R of the resistors 31 to 33, during servo control.
The resistance value comparison means 52 compares the measured resistance value R with a preset resistance threshold value R1, and when the measured resistance value R is smaller than the resistance threshold value R1, the resistors 31 to 33 are deteriorated. to decide. The resistance threshold value R1 is arbitrarily set in consideration of the processing capability of the servo press 1, and is stored in a storage element (not shown).
The warning information generation unit 53 has a function of generating warning information and outputting and displaying the warning information on the display device 8 when it is determined that the resistors 31 to 33 are deteriorated.

Hereinafter, the performance monitoring of the dynamic brake by each of the means 51 to 53 will be described with reference to the flowchart of FIG.
First, the resistance value measuring means 51 of the NC device 2 measures the resistance value R between the output terminals 34 and 35 of the DB module 20 (S1), and the resistance value comparing means 52 is preset with the measured resistance value R. It is monitored whether it is below the resistance threshold value R1 (S2). If the resistance value R is equal to or greater than the resistance threshold value R1, the resistance value comparison means 52 determines that the resistance value R is sufficiently large and can exhibit normal braking performance when the dynamic brake is activated, and returns to S1.

  On the other hand, when the resistance value R falls below the resistance threshold value R1, it is determined that the resistors 31 to 33 have deteriorated over time, or that the dynamic brake performance cannot be sufficiently exhibited for some reason. When it is determined in this way, the warning information generation means 53 generates warning information such as “dynamic brake performance is degraded”, and outputs and displays the warning information on the display device 8. Exchange is urged (S3).

  As described above, according to the present embodiment, the DB module 20 is provided with the output terminals 34 and 35 for outputting the resistance value R of the internal resistors 31 to 33. By measuring the resistance value R between 35, the deterioration state of the resistors 31 to 33 can be determined, and even the dynamic brake that is not normally used can be monitored well.

The best configuration, method, and the like for carrying out the present invention have been disclosed above, but the present invention is not limited to this. That is, the invention has been illustrated and described with particular reference to certain specific embodiments, but without departing from the spirit and scope of the invention, Various modifications can be made by those skilled in the art in terms of quantity and other detailed configurations.
Therefore, the description limited to the shape, quantity and the like disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

  For example, in the above-described embodiment, the example in which the DB module 20 according to the present invention is employed in the servo press 1 has been described. However, the DB module according to the present invention is not limited to the servo press, and may be used for servo-controlled industrial machines. Good.

  The present invention can be suitably used for industrial machines such as machine tools and servo presses equipped with DB modules.

1 is a block diagram showing a schematic configuration of a servo press 1 in which a dynamic brake module according to the present embodiment is used. The block diagram which shows the NC apparatus and dynamic module of a servo press concretely. The flowchart which shows the monitoring flow of a dynamic brake.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Servo press, 2 ... NC apparatus which is a control apparatus, 3 ... Servo module, 4 ... Servo motor, 7 ... Slide, 8 ... Display apparatus, 20 ... Dynamic brake module, 21-23 ... 1st which is an input side contact -3rd relay contact, 24-26 ... 4th-6th relay contact which is a resistor side contact, 27-29 ... 6th-9th relay contact which is a contact for resistance value measurement, 31-33 ... resistor 34, 35 ... output terminals, 41-43 ... first to third relay switches as brake switches, 44-46 ... fourth to sixth relay switches as resistance value measuring switches, 51 ... resistance value measuring means, 52 ... Resistance value comparing means, 53 ... Warning information generating means, U, V, W ... Electric power line.

Claims (3)

In the dynamic brake module,
A resistor that consumes electrical energy and converts it into thermal energy;
An input-side contact provided on the input side of the electrical energy;
A resistor-side contact provided on the resistor side;
A brake switch for opening and closing between the input side contact and the resistor side contact;
A resistance value measuring contact provided for measuring the resistance value of the resistor;
A resistance value measuring switch that interlocks with the brake switch and closes the resistor side contact and the resistance value measuring contact when the brake switch is in an open state;
An output terminal electrically connected to the contact point for resistance value measurement. A dynamic brake module, comprising: In servo press,
A servo module that generates drive power based on the drive command;
A servo motor driven by drive power from the servo module;
A slide driven by the output torque of the servo motor;
A servo brake comprising: the dynamic brake module according to claim 1 connected to an electric power line between the servo module and the servo motor. In the servo press according to claim 2,
A control device that outputs the drive command to the servo module;
A display device connected to the control device,
The controller is
Resistance value measuring means for measuring the resistance value of the resistor obtained through the output terminal;
A resistance value comparing means for comparing the measured resistance value with a preset resistance threshold;
A servo press comprising: warning information generating means for generating warning information based on the comparison result of the resistance value comparing means and outputting the warning information to the display device for display.

Images