KR101438224B1 - Automatc impellent force compensating unit of tail stock and method thereof - Google Patents

Abstract

The present invention relates to an apparatus and method for automatically correcting a thrust force of a servo-driven trapezoidal pressure gauge, and more particularly, to an apparatus and method for automatically correcting a thrust force of a servo- A comparator for determining whether the thrust value is within a reference range; If it is determined that the desired pressure value is not sensed at the desired time, the controller determines that the foreign object is caught in the conveyance path and outputs a check signal. If the pressure value is out of the reference range, A control unit for controlling the material to be pressed; A servo motor for appropriately pressing the workpiece in accordance with the control signal of the control unit so that the workpiece can be firmly fixed to the center of the pressure- And a display unit (80) for displaying, in accordance with a control signal of the control unit, whether the cardiovascular unit is normally operating or an error condition is externally displayed.

Servo, driven type, tail load, thrust, automatic, compensation

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thrust automatic correction apparatus and method for a servo-

The present invention relates to a servodrive type tailstock used in a lathe-type CNC machine tool, and provides an apparatus for automatically correcting a thrust constantly when pressure fluctuates due to a load generated during machining, And the thrust of the servo-driven type pressure-sensitive bar is automatically corrected when a change in the pressure of supporting the material by the time load occurs.

In general, when the length of the material is long in a lathe type CNC machine tool, a hydraulic or servo driven type tailstock is applied to prevent shaking and jamming of the workpiece during machining. At this time, maintaining the thrust constantly, which is the force for supporting the material, is an important technical factor for increasing the precision of the material.

FIG. 1 is a diagram showing an operation state before the cardiovascular member reaches the workpiece, FIG. 2 is an operational state diagram after the cardiovascular support reaches the general prior art, FIG. As described above, the cardioplet 100 enters the material 200, and the core 200 is engaged with the center of the material, and then the material 200 is processed using the tool. At this time, the torque and the permissible speed command are applied to the servo control system from the PMC to control the speed of the servo motor so that the ten points 100 are engaged with the material at an appropriate speed.

The method of supporting the conventional card stock 100 in the material 200 to be processed is a non-contact method, and the automatic limit of the automatic transfer of the axis for conveying the tablet 100 using the torque limiter function provided by the controller manufacturer And recognizes that the feed forward speed from the signal is supported when a change is detected.

However, in the non-contact method, even when the foreign matter enters the sliding surface during transportation or when the foreign matter does not reach the work 200 due to the disturbance, It is recognized that the material 200 is supported. Thereby causing a malfunction. As a result, the workpiece can not be accurately supported during the machining operation, thereby causing a risk of machining failure or tool breakage.

That is, in the non-contact method, after the feed speed of the shaft for feeding the tensile staple 100 to the work 200 is instructed, the feeding is completed when the speed is fed back from the servo motor encoder and the variation occurs below a constant speed. The center 200 is not fully contacted with the work 200, so that it can not be detected when the feed speed fluctuates. Therefore, in spite of the fact that the work 100 does not reach the work 200, The abutment 100 is erroneously recognized as having reached the work 200, which causes many problems such as breakage of the tool or breakage of the equipment in the subsequent machining operation.

In addition, since the tensile staple 100 is only capable of automatic feeding, a feedback circuit for compensating whether or not the currently set thrust is normally performed is not configured. Due to such factors, There is a problem that the material 200 is shaken during processing and defects are generated.

SUMMARY OF THE INVENTION The present invention has been made in an effort to solve the above problems, and it is an object of the present invention to provide a method and apparatus for detecting a foreign matter in a transfer section when a pressure gauge is not reached within a set time, The present invention aims at controlling the servomotor at all times so that the thrust required for supporting the tool is sensed through the pressure sensor.

In order to achieve the above object, the present invention provides a pressure sensor comprising: a pressure sensor installed in a tailstock center and sensing a strength of a tailstock center; A pressure setting unit (20) for presetting a pressure value to be provided through the tailstock center (110); A thrust setting unit 30 for setting the thrust value of the servomotor to flow through the tailstock 100 so that the tailstock 100 is fed with a desired thrust; An A / D converter 40 for converting a pressure value measured by the pressure sensor 10 into a digital value and outputting the changed signal to the outside; The data output from the pressure sensing sensor 10 and the data set in the pressure setting unit 20 and the thrust setting unit 30 set in advance are compared with each other so that the pressure value and the thrust value of the tire stock center 110 are set in the reference range A comparator 50 for determining whether or not the voltage is within a predetermined range; As a result of the determination by the comparator 50, if a desired pressure value is not sensed at a desired time, it is determined that the foreign object is adhered to the conveyance path and a check signal is output. When the pressure value is out of the reference range, A control unit (60) for controlling the material to be pressed with a desired thrust; A servomotor 70 for actuating the center 110 of the pressure-sensitive zone in response to a control signal from the control unit 60 to press the workpiece; And a display unit 80 for displaying the operation status of the tail stock 100 on the outside according to a control signal of the control unit 60.

The automatic thrust correction method of a servo-driven trapezoidal pressure band according to the present invention includes the steps of setting a pressure value and a thrust value suitable for a workpiece 200 in units of kg / f and Nm in a data table value of NC, (S10); Storing the set value in the step S10 as a nonvolatile address provided by the PMC (S20); A step (S30) of instructing the tail stock 100 at a desired feed speed; A step (S40) of feeding the tail stock 100 in the direction of the work 200 to be processed; If the data value detected by the pressure detection sensor 10 is not detected within a preset time by a preset pressure value in step S10, it is determined that interference has occurred due to disturbance in the movement path, Wow; A step (S60) of starting machining after sending out a tailstock delivery completion signal when a range of values set in S10 is satisfied within a set time; And a step (S70 to S110) of calculating a thrust value based on the sensed value by sensing the pressure supporting the material 200 during processing and automatically correcting the thrust.

Preferably, the step (S70 to S110) of calculating the thrust value based on the sensed value by sensing the pressure of supporting the workpiece 200 during processing and automatically correcting the thrust force may include: (S70) of confirming whether a change in pressure occurs in a direction opposite to the thrust to be supported or within a set range; At this time, if the sensed value is within the setting range, the thrust OK LED is turned on in real time in the display unit 80 that the thrust is normal, and if an abnormal state is detected out of the set range rule, And calculating a thrust value (S80); A step (S90) of transmitting an error amount to the servo drive by an error amount of pressure and generating a pulse to forward the servo motor 70; Performing automatic correction of the thrust through the transfer of the tail stock 100 (S100); (S110) of adjusting the thrust force by a variation amount of the pressure temporarily and maintaining the set pressure and thrust when the routine by the adjustment is completed.

The present invention provides the following effects.

First, by using the pressure sensor installed at the end of the center during conveyance of the tailstock drive shaft for the support of the material, when the speed fluctuation occurs due to disturbance during conveyance, the center can be perfectly adhered to the work.

Second, since the completion signal of the servo driven type pressure ball can be detected through the pressure detection, the axis feed speed for supporting the work can be increased, and the cycle time can be shortened.

Third, you can check the state of the thrust pushing the material through the indicator lamp, which is the display part.

Fourth, if the pressure is out of the setting range, the thrust can be automatically corrected by turning the tail conveyor axis forward / backward by converting the error into pulses so that the thrust can be kept constant through the CNC internal data comparator.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals refer to the like elements throughout. The same elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 4 is a block diagram showing an overall configuration of the present invention, FIG. 5 is a view showing a display unit, FIG. 6 is a view for explaining a manner in which thrust is automatically corrected according to the present invention, Fig.

4, the present invention includes a pressure sensor 10, a pressure setting unit 20, a thrust setting unit 30, an A / D converter 40, a comparator 50, A control unit 60, a servo motor 70, and a display unit 80.

The pressure sensing sensor 10 is disposed at a rear end of the cardiac centering center 110 to sense the strength of the cardiac centering center 110 to press the processing material 200.

The pressure setting unit 20 sets the pressure value to be provided through the tailstock center 110 in advance.

The thrust setting unit 30 sets the thrust value of the servomotor to flow the tail stock so that the tail stock 100 is transported with a desired thrust.

The A / D converter 40 converts the pressure value measured by the pressure sensor to a digital value and outputs the changed signal to the outside.

The comparator 50 compares the data output from the pressure sensor 10 with the data set in the pressure setting unit 20 and the thrust setting unit 30 that are set in advance, Value is within the reference range.

If the desired pressure value is not sensed at the desired time as a result of the determination by the comparator 50, the controller 60 determines that the foreign object is caught in the conveyance path and outputs a check signal. If the pressure value is out of the reference range, And outputs a signal to control the material to be pressed with a desired thrust.

The servo motor 70 appropriately presses the workpiece in accordance with the control signal of the controller 60 so that the workpiece can be firmly fixed to the center 110 of the pressure-

The display unit 80 externally indicates whether the tailstock 100 is normally operating or in an error state in accordance with a control signal from the control unit 60. [

The operation and effect of the present invention will be described as follows.

4, the servo drive type tailstock 100 is fed to the work 200 in the direction of the work 200 at a speed commanded by the feed shaft servomotor 70, and the pressure setting portion 20 of FIG. And the thrust setting unit 30 are converted into PMC data and stored as a set value in the nonvolatile address.

When the value detected by the pressure sensor 10 is detected by the feed shaft servomotor 70 while the tail stock 100 is transported, the tail stock 100 is completely brought into close contact with the work 200. In this case, A completion signal is fed back to the PMC device.

The data of the pressure sensor 10 provided at the end of the center 110 during processing is converted into a digital signal through the A / D converter 40 and input to the controller 60. The comparator 50, which is a PMC calculator, The thrust normal LED is turned on in the display unit 80 of Fig. 5 if no error is detected as a result of comparing the set pressure value with the feedback data.

The control unit 60 transmits the error amount generated when an error is detected between the pressure tolerance value and the data input through the current pressure sensor through the comparator 50 to the drive, Adjusts the pulse amount of the motor 70 and automatically corrects the thrust to transfer the position of the tail stock 100 forward / backward so as to keep the pressure and the thrust constant.

FIG. 5 shows a structure of a pressure / thrust setting unit suitable for a work and a display unit 80 for indicating a current thrust state.

5, a pressure value is set in a unit of kg / f in a pressure setting unit 20 suited to a material characteristic, a thrust value is set in a unit of Nm in a thrust setting unit 30, It can be confirmed in real time through the display unit 80 that the normal thrust is applied by feeding back the data.

Figure 6 is a schematic representation of a structure for maintaining the magnitude of pressure and thrust constant according to the present invention.

6, the servo driven type tailstock 100 maintains the same magnitude of the thrust FA for supporting the work 200 and the pressure FB detected by the pressure sensor 10 installed at the rear end of the center The amount of shaking of the material is suppressed as much as possible, so that the precision can be improved and the defective material can be minimized.

The pressure sensor 10 is installed at the rear end of the cardiac pivot center 110 and the data value sensed by the pressure sensor 10 is converted into a digital value by the A / D converter 40 And the comparator 50 sets the reference pressure value and the thrust value in advance and compares the information input from the pressure sensing sensor 10 with a preset pressure value and a preset thrust value with each other do.

If the compared pressure value and the thrust value are within the reference range, it indicates that the normal operation of the tail stock 100 is being performed through the display unit 80, and the comparison result is measured by the current pressure detection sensor 10 If the pressure value of the tailstock center 110 is not input within a predetermined time, it is determined that foreign matter or the like is obstructed in the conveyance path of the tailstock 100 and a check signal is displayed through the display unit. The control unit 60 applies a driving signal to the servo motor 70 and outputs the driving signal to the tire 200 in the direction of the work 200. In this case, 100).

As a result, the pressure value and the thrust value measured by the pressure sensor 10 installed at the rear end of the tire stock center 110 rise, and the ascended signal is input to the comparator 50 through the A / D converter 40 The comparator then compares the pressure value and the thrust value preset in real time. Then, when the pressure value and the thrust value are within the reference range, the servo motor 70 is stopped. If the pressure value and the thrust value are not within the reference range, , The servomotor (70) is continuously driven so that the cardiac pivot center always supports the material with the desired pressure value and thrust value.

FIG. 7 is a flow chart illustrating a detailed process of the PMC and the operation process for implementing the function in the present invention.

When a pressure value and a thrust value corresponding to the material are set in units of kg / f and Nm in the NC data table value (S10), the set value is stored as a nonvolatile address provided by the PMC (S20) .

When the servomotor 100 is fed at a desired speed (S30), the motor of the feed shaft is driven in the direction of the workpiece 100 to be processed and the tailstock 100 is fed (S40). At this time If the data value detected by the pressure detection sensor 10 is not detected within the set time by a pressure value preset in S10, it is determined that interference has occurred due to disturbance in the movement path, and the movement route interference check alarm is sent out. As a result, it is possible to prevent collision or malfunction due to malfunctions in advance.

In addition, if the range of the value set in S10 is satisfied within the set time (S50), a tailstock delivery completion signal is sent (S60) and processing is started.

When the pressure fluctuation occurs in the opposite direction of the thrust force for supporting the workpiece 200 or is detected within the set range (S70), the thrust OK LED is turned on in real time on the display unit 80 and the abnormality (S80), the error amount is transmitted to the servo drive by the error of the pressure, the pulse is generated, and the servo motor 70 is operated (S90).

The thrust is automatically corrected through the transfer of the tailstock 100 (S100), and the thrust is temporarily adjusted by the variation amount of the pressure. When the routine by the adjustment is completed, the set pressure and thrust are maintained (S110).

By sensing the fluctuation of the pressure sensor 10, the thrust value and the pressure value of the servo drive type tailgate 100 can be maintained in accordance with the workpiece to improve the accuracy of the workpiece, and the collision can be prevented in advance through the travel path interference check .

Although specific embodiments of the present invention have been described above, it should be understood that the spirit and scope of the present invention is not limited to these specific embodiments, but various modifications and variations may be made without departing from the scope of the present invention. It will be understood by those of ordinary skill in the art to which the present invention belongs.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

FIG. 1 is an operational state view of a prior art prior to the arrival of the cardioplegia on the material; FIG.

Fig. 2 is an operational state diagram after the pressure-sensitive bush has reached the prior art. Fig.

3 is a typical control configuration diagram for driving a tailstock.

4 is a block diagram showing an overall configuration of an automatic thrust correction apparatus according to the present invention;

5 is a view showing a display unit used in the thrust automatic correction apparatus of the present invention.

6 is a view for explaining a state in which thrust is automatically corrected according to the present invention.

7 is a flow chart of operations according to the present invention;

Description of the Related Art

10: pressure sensor 20: pressure setting unit

30: thrust setting unit 40: A / D converter

50: comparator 60:

70: Servo motor 80: Display part

100: tailstock 200: material

Claims (3)

A pressure sensor 10 installed at the tailstock center 110 and sensing the strength of the tailstock center 110 to press the workpiece; A pressure setting unit (20) for presetting a pressure value to be provided through the tailstock center (110); A thrust setting unit 30 for setting the thrust value of the servomotor to flow through the tailstock 100 so that the tailstock 100 is fed with a desired thrust; An A / D converter 40 for converting a pressure value measured by the pressure sensor 10 into a digital value and outputting the changed signal to the outside; The data output from the pressure sensing sensor 10 and the data set in the pressure setting unit 20 and the thrust setting unit 30 set in advance are compared with each other so that the pressure value and the thrust value of the tire stock center 110 are set in the reference range A comparator 50 for determining whether or not the voltage is within a predetermined range; As a result of the determination by the comparator 50, if a desired pressure value is not sensed at a desired time, it is determined that the foreign object is adhered to the conveyance path and a check signal is output. When the pressure value is out of the reference range, A control unit (60) for controlling the material to be pressed with a desired thrust; A servomotor 70 for actuating the center 110 of the pressure-sensitive zone in response to a control signal from the control unit 60 to press the workpiece; And a display unit (80) for displaying an operation state of the tail stock (100) to the outside according to a control signal of the control unit (60). (S10) of setting a pressure value and a thrust value suitable for the material (200) in the data table value of NC in units of kg / f and Nm; Storing the set value in the step S10 as a nonvolatile address provided by the PMC (S20); A step (S30) of instructing the tail stock 100 at a desired feed speed; A step (S40) of feeding the tail stock 100 in the direction of the work 200 to be processed; If the data value detected by the pressure detection sensor 10 is not detected within a preset time by a preset pressure value in step S10, it is determined that interference has occurred due to disturbance in the movement path, Wow; A step (S60) of starting machining after sending out a tailstock delivery completion signal when a range of values set in S10 is satisfied within a set time; Calculating a thrust value based on the sensed value by sensing the pressure of supporting the workpiece 200 during the machining process and automatically correcting the thrust force (S70 to S110) Wherein the thrust is automatically compensated by the thrust of the servo-driven thrust bearing. 3. The method of claim 2, The step (S70 to S110) of calculating the thrust value based on the sensed value by sensing the pressure supporting the workpiece 200 during processing and correcting the thrust automatically (S70) confirming whether a change in pressure occurs in a direction opposite to a thrust force supporting the work 200 during processing or within a set range; At this time, if the sensed value is within the setting range, the thrust OK LED is turned on in real time in the display unit 80 that the thrust is normal, and if an abnormal state is detected out of the set range rule, And calculating a thrust value (S80); A step (S90) of transmitting an error amount to the servo drive by an error amount of pressure and generating a pulse to forward the servo motor 70; Performing automatic correction of the thrust through the transfer of the tail stock 100 (S100); The thrust is temporarily adjusted by the variation amount of the pressure, and when the routine by the adjustment is completed, a step (S110) of maintaining the set pressure and thrust, Wherein the thrust is automatically compensated by the thrust of the servo-driven thrust bearing.

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