JP2005052889A - Blank supplying apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blank supplying apparatus capable of enhancing the function of the feeding accuracy, the feeding speed, the feeding force, or the like while employing a roller type simple mechanism. <P>SOLUTION: The blank supplying apparatus comprises a precise feed mechanism 14 comprising a pair of precise feed rollers 11 and 12 and a precise servo motor 13 to drive the precise feed rollers, a blank auxiliary feed mechanism 18 comprising a plurality of pairs of auxiliary feed rollers 15a-15d, 16a-16d and a torque control motor 17 to drive the auxiliary feed rollers and capable of straightening a blank, and a controller 20 to feed the blank by a predetermined quantity by performing drive control of the precise servo motor 13 and the torque control motor 17. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

Detailed Description of the Invention

  The present invention relates to a material supply device such as a former for forging a bolt or other various parts.

  2. Description of the Related Art Conventionally, a roller feed type and a grip feed type are known as a material supply device for supplying a coiled metal wire in a former for forging parts such as bolts. The roller feed type is a mechanism that urges one of the pair of material feed rollers toward the other roller, presses the material against the other roller, and rotates the roller with a drive motor in the pressed state to supply the material for a fixed length. In addition, the grip feed type is a mechanism for holding the material by a pair of grip bodies and supplying the material for a certain length by moving both grip bodies by a predetermined length while the gripping state is held.

Problems to be solved by the invention

  By the way, the above-mentioned roller feed type has a simple structure compared to the grip feed type, and the feed amount can be changed arbitrarily by changing the rotation amount without changing the mechanical dimensions. On the other hand, because the roller contact surface to the material is small, a large pressing force (stress) by the roller is applied to the material, and the contact surface may be scratched, and the feeding accuracy Also, there is a limit in the structure of the feed rate, which has been an obstacle to servoing. Therefore, the roller feed type is required to improve feed accuracy and feed speed and to have a large feed force.

  Therefore, an object of the present invention is to provide a material supply device that can improve functions such as feed accuracy, feed speed, and feed force while adopting a simple roller-type mechanism.

Means for solving the problem

  In order to solve the above-described problem, the invention described in claim 1 of the present application includes a precision feed mechanism including a pair of precision feed rollers and a precision servomotor that drives these precision feed rollers, and a plurality of pairs of auxiliary feed rollers. Auxiliary feed mechanism that also serves as a material correction consisting of a torque control motor that drives these auxiliary feed rollers, and a controller that drives and controls a precision servo motor and a torque control motor to feed a predetermined amount of material. And

  In the invention according to claim 2 of the present application, the controller according to claim 1 described above is based on the auxiliary feed torque value of the torque control motor and the precise feed torque value of the precision servo motor. Estimate the force applied to the material between the stopper provided in front of the feed mechanism and the force applied to the material between the precision feed mechanism and the auxiliary feed mechanism, and adjust the torque control motor so that the auxiliary feed torque value and the precision feed torque value become the appropriate torque. It is characterized by comprehensive control of precision servo motors.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The drawings show a material supply device according to the present invention applied to a former that forms a product of a predetermined shape by forging a cutting blank with a punch and a die, for example. The former 1 has a coiled metal wire (hereinafter referred to as a coil material) A mounted on a side rear portion of the machine base 2 via a coil winder (not shown) to the tip end of the cylindrical quill 3. Cutting the supplied coil material A by reciprocating in the direction orthogonal to the supply direction of the coil material A on the front surface of the material supply device 10 to be sent intermittently and the quill 3 provided at the side front of the machine base 2 And a cutting mechanism 5 having a cutting knife 4 to perform.

  The cutting knife 4 of the cutting mechanism 5 has a hole blade through which the coil material A can pass, and the amount of protrusion of the coil material A from the tip end of the coil material A is restricted to a fixed length at the front position of the quill 3. A stopper 6 is provided.

  The material supply device 10 includes a pair of precision feed rollers 11, 12 and a precision feed mechanism 14 including a precision servo motor 13 that drives the rollers 11, 12, and a plurality of pairs of auxiliary wire feed rollers 15a ... 15d, 16a ... 16d and a torque control motor 17 that drives these auxiliary feed rollers 15a ... 15d, 16a ... 16d, and includes an auxiliary feed mechanism 18 that also serves to correct the coil material A, a precision servo motor 13, and a torque control motor 17. And a controller 20 that controls the drive and feeds a predetermined amount of the coil material A.

  The auxiliary feed mechanism 18 performs fine adjustment control based on torque information from the precision feed mechanism 14 and torque information of the auxiliary feed mechanism 18 itself. In this case, the auxiliary feed torque Tm is controlled so that the force F2 applied to the coil material A between the precision feed mechanism 14 and the auxiliary feed mechanism 18 falls within a specified range. The force F2 applied to the coil material A between the precision feed mechanism 14 and the auxiliary feed mechanism 18 is determined within the capability range of the precision servomotor 13. Also, the provision of a plurality of pairs of auxiliary feed rollers 15a ... 15d, 16a ... 16d increases the contact area of each roller with the coil material A, that is, the gripping force, and the pressing force Wm against the coil material A by each roller. Is to suppress the deformation of the coil material A.

  The precision feed rollers 11 and 12 of the precision feed mechanism 14 are configured such that the pressing force Wc of the coil material A can be controlled by the controller 20 to cope with, for example, fluctuations in the material pulling force T accompanying changes in the state of the coil material A. Yes. Accordingly, the pressing force Wc is set to a necessary value for torque transmission necessary for control. The main feeding force is provided by the auxiliary feeding mechanism 18. Here, when the stopper 6 is used, the precision feed control torque Tc is set so as not to exceed the product of the pressing force Wc and the friction coefficient, and the slip of the coil material A and the precision feed rollers 11 and 12 is made zero. ing.

  The precision servomotor 13 controls the feed amount of the coil material A and the force F1 applied between the precision feed mechanism 14 and the stopper 6 in a stationary state based on the position information. Normally, the pulling force T of the coil material A toward the winding coil varies in a situation where the coiled coil material A is fed out. The force F2 applied to the coil material A between the precision feed mechanism 14 and the auxiliary feed mechanism 18 controlled by the feed control torque Tc by the precision servo motor 13 is within a specified range.

  The stopper 6 is provided with a pressure sensor, detects the short length of the coil material A and the tip thereof, and outputs the detection result to the controller 20. Here, since the normal feed amount is accurately controlled by the precision feed mechanism 14, an excessive pressure is not normally applied. Excluding special uses such as compression cutting.

  Based on the auxiliary feed torque value of the torque control motor 17 and the precision feed torque value of the precision servomotor 13, the controller 20 applies the force F1 applied to the coil wire A between the precision feed mechanism 14 and the stopper 6 and the precision feed mechanism 14 and the auxiliary feed. A force F2 applied to the coil wire A between the feed mechanisms 18 is estimated, and the torque control motor 17 and the precision servomotor 13 are comprehensively controlled so that the auxiliary feed torque value and the precision feed torque value become appropriate torques. In other words, vibration of the torque control motor 17 and the precision servo motor 13 is avoided by this overall control. The controller 20 controls the feed amount by position control, controls the force F1 applied to the material between the precision feed mechanism 14 and the stopper 6 at the time of stopping, and the output signal from the pressure sensor 19 provided on the stopper 6. A stop control based on the above is performed.

Next, the operation of the material supply device having the above-described configuration will be described.
First, the precision servo rollers 33 and 12 and the auxiliary feed rollers 15a ... 15d, 16a ... 16d drive the precision servomotor 33 and the torque control motor simultaneously while pressing the coil wire A, The coil material A is supplied to the quill 3 side by rotating the precision feed rollers 11, 12 and the auxiliary feed rollers 15a ... 15d, 16a ... 16d. When a certain amount of the coil material A is supplied to the quill 3 side, the precision servo motor 13 and the torque control motor 17 are stopped. In this case, the coil material A passes through the hole blade of the cutting knife 4 and comes into contact with the stopper 6 and stops in a state where the cutting length is fixed. At the timing when the supply is stopped, the cutting knife 4 is moved forward, and cutting is performed between the quill 3 and the cutting knife 4. Thereafter, the cut blank is transferred to a forging station (not shown) composed of a die and a punch, and is forged into a suitable shape in the same manner as the forging operation performed by an existing former. When the driving of the precision servo motor 13 and the torque control motor 17 is stopped, the tip of the coil material A hits the stopper 6 and the contact is detected by the pressure sensor, so that the coil material A is supplied for a certain length. I will confirm that. Here, when the pressure detection signal from the pressure sensor 19 is not output, the controller 20 stops the supply or assumes that the coil material A is a short material (material supply failure) less than the predetermined length, Or stop driving.

  In the material supply device of the present invention, since the auxiliary feed mechanism 18 is provided separately from the precision feed mechanism 14, excessive stress applied to the coil material A, which has become a problem with the roller system, is dispersed. At the same time, the effective contact area between the coil material A and the feed roller can be increased, and as a result, functions such as the feed accuracy, feed speed, and feed force of the coil material A can be remarkably improved. Further, when the coil material A is used as a material, even if the pulling force of the coil material A (force necessary for feeding the material) varies, the controller 20 causes the precision feed rollers 11 and 12 to respond to the variation. By controlling the precision feed torque value and the auxiliary feed torque values of the auxiliary feed rollers 15a... 15d, 16a. It becomes. In addition, by using a plurality of pairs of auxiliary feed rollers 15a... 15d, 16a. It is possible to reduce the stress by dispersing, and more effectively disperse.

  In the above embodiment, the material supply device is applied to the former. However, the material supply device is not limited to the former, and is applicable to other devices such as a cutting device or a material processing device that only cuts the material. Of course you can.

The invention's effect

  As described above, according to the material supply device of the present invention, a precision feed mechanism including a pair of precision feed rollers and a precision servo motor that drives these precision feed rollers, a plurality of pairs of auxiliary feed rollers, and driving these auxiliary feed rollers. A material that has become a problem in the roller system because it has an auxiliary feed mechanism that also serves as a material correction consisting of a torque control motor and a controller that drives and controls a precision servo motor and a torque control motor to feed a predetermined amount of material. Can reduce the excessive stress applied to the precision feed mechanism and auxiliary feed mechanism while reducing the effective contact area between the material and the feed roller. As a result, functions such as the feed accuracy, feed speed, and feed force of the material can be achieved. Can be significantly improved. In addition, by using multiple pairs of auxiliary feed rollers as the auxiliary feed mechanism, the effective contact area between the material and the feed roller can be actively increased, and excessive stress on the material can be dispersed and reduced, making it more effective. Can be distributed.

  Further, the controller applies the force applied to the material between the precision feed mechanism and the stopper provided in front of the precision feed mechanism based on the auxiliary feed torque value of the torque control motor and the precision feed torque value of the precision servo motor, and the precision feed mechanism and the auxiliary feed. If the force applied to the material between the mechanisms is estimated, and the torque control motor and the precision servo motor are configured to be comprehensively controlled so that the auxiliary feed torque value and the precision feed torque value become the appropriate torque, for example, the coil material When used as a material, even if the pulling force of the material (the force required to feed the material) varies, the controller controls the precision feed torque value of the precision feed roller and the auxiliary feed roller auxiliary feed according to the variation. By comprehensively controlling the torque value, functions such as the feed accuracy, feed speed, and feed force of the material can be properly exhibited.

It is a vertical side view of the principal part of the former | foamer provided with the raw material supply apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Precision feed roller 12 Precision feed roller 13 Precision servo motor 14 Precision feed mechanism 15a ... 15d Auxiliary feed roller 16a ... 16d Auxiliary feed roller 17 Torque control motor 18 Auxiliary feed mechanism 20 Controller

Claims (2)

  Auxiliary feed that also serves as a material corrector consisting of a pair of precision feed rollers, a precision feed mechanism that consists of precision servo motors that drive these precision feed rollers, and a plurality of pairs of auxiliary feed rollers and a torque control motor that drives these auxiliary feed rollers A material supply device comprising: a mechanism, and a controller that drives and controls a precision servo motor and a torque control motor to feed a predetermined amount of material.   Based on the auxiliary feed torque value of the torque control motor and the precise feed torque value of the precision servo motor, the controller applies the force applied to the material between the precision feed mechanism and the stopper provided in front of the precision feed mechanism, and between the precision feed mechanism and the auxiliary feed mechanism. 2. The material according to claim 1, wherein a force applied to the material is estimated, and the torque control motor and the precision servo motor are comprehensively controlled so that the auxiliary feed torque value and the precision feed torque value become appropriate torques. Feeding device.

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