KR940007407B1 - Method and apparatus for controlling cylinder grinding machines - Google Patents

Abstract

No content.

Description

Cylinder grinding machine control method and device

1 is a side view of a grinding tool and control device embodying the present invention in a partial block.

2 is a side view showing an embodiment of an automatic diameter measuring device.

3 is a side view showing, in partial cross-section, an embodiment of the bending suppression apparatus.

4 is a block diagram showing a control device of the present invention.

5 is a flowchart showing a grinding step of the grinding tool.

FIG. 6 is a side view similar to FIG. 1 showing another embodiment of the present invention. FIG.

7 is a partial sectional view showing the operation of a touch sensor and an automatic bending suppression device.

8 is a block diagram showing a modification of the control device of the present invention.

9 is a flowchart showing the grinding step of the grinding tool controlled by the modified control device shown in FIG.

* Explanation of symbols for main parts of the drawings

11: Workbench 12: Headstock

13: tailstock 18: grinding machine table

19: grinding machine 30: diameter measuring device

40: bending suppression device 41: support member

71: touch sensor

The present invention relates to a cylinder, and more particularly to a method for controlling a cylinder grinding machine of long and relatively small diameter and a device thereof.

In order to machine high precision slender cylindrical workpieces, it is necessary to control the calculator so that the axes interconnecting the headstock and tailstock used to rotatably support both ends of the workpiece are parallel to the direction of motion of the grinding machine or cylindrical workpiece. . The warpage suppression device provided with the supporting member for engaging the cylindrical workpiece is provided at a position facing the grinding warpage to prevent the intermediate portion of the cylindrical workpiece from causing a small vibration or warpage in the grinding machine.

Previously, parallel adjustment of the supporting member and the shaft of the bending suppression device was performed manually. Recently, however, the automation of workpiece support has been developed due to the need for automation of grinding machines. For example, as disclosed in Japanese Patent Application Laid-Open No. 87-5761, there is provided a work support device having a dimension measuring device for measuring the diameter of a cylindrical work piece so as to detect a contact state with a support member of the bending restraining device for the cylindrical work piece. A grinding machine is included.

As described above, in the conventional grinding machine equipped with the work support device, the dimensional measuring device is used to prevent the unstable support state of the work support device and to prevent the unstable support state of the work support device. It is provided to detect the contact state of the supporting member.

The longitudinal axis of the cylindrical workpiece is oriented not caused to be parallel to the axis or the direction of motion of the cylindrical workpiece caused by the bending of the cylindrical workpiece of relatively small diameter, thereby reducing the working precision and at the pressure applied by the backing member. Warpage occurs.

An object of the present invention is to provide a cylindrical workpiece by automatically controlling the feed amount of the grinding wheel when the cylindrical workpiece is bent or when the axis interconnecting the headstock and tailstock is not parallel to the axis of the grinding wheel or the direction of movement of the cylindrical workpiece. It is to provide a novel control method and apparatus that can be precisely ground.

It is another object of the present invention to provide a novel method for controlling a cylindrical member grinder in which the support member of the deflection suppressor can engage the cylindrical workpiece under optimum conditions so that the cylindrical workpiece can be precisely ground without vibration and bending of the workpiece during grinding. And to provide an apparatus.

It is a further object of the present invention to provide a novel control method and apparatus for a cylindrical workpiece grinding machine which can perform a corrective grinding operation so that the diameter of the ground workpiece is included in an acceptable range, thereby achieving a grinding operation with high precision.

It is another object of the present invention to provide a control method and apparatus for controlling a grinding machine for grinding a thin cylindrical workpiece that can prevent the bending of the workpiece.

According to one aspect of the invention, a grinding machine support for rotatably supporting a grinding machine for grinding a cylindrical workpiece, means for transporting the grinding wheel support in a direction perpendicular to the axis of the cylindrical workpiece, and the grinding machine and the cylindrical workpiece in the axial direction relatively A method for controlling a cylinder grinding machine comprising a means for moving, said method comprising the steps of measuring the diameter of a cylindrical workpiece and adjusting the axis of the workpiece in accordance with a position signal at each axial position of the workpiece and the diameter signal sent from the diameter measuring means. Calculating the diameter of the workpiece at each of the positions, controlling the feed amount of the grinder support such that the diameter error of the workpiece at each position is smaller than the allowable, suppressing the force of the workpiece, and It consists of adjusting the applied engagement force.

According to another aspect of the present invention, there is provided a grinding machine support rotatably supporting a grinding machine for grinding a cylindrical workpiece, means for transferring the grinding supporter in a direction perpendicular to the axis of the cylindrical workpiece, and axially moving the grinding machine and the cylindrical workpiece. 10. A control device for a cylinder grinding machine comprising means for relatively moving the tool, said control device comprising: means for measuring the diameter of the cylindrical workpiece, the workpiece at each position along the axis of the workpiece in accordance with a position signal sent from the diameter measuring means. Relatively moving means comprising means connected to the diameter measuring means for calculating the diameter, control for controlling the feed amount and the relatively moving means of the grinder support such that the diameter error of the workpiece at each position is smaller than the allowable Tool, grinding wheel support Arranged on one side of and is composed of control means associated with the deflection suppression means connected to control the deflection suppression means includes engagement means for engaging with the workpiece from both sides of the cylindrical workpiece, and the engagement force of the engagement means.

The grinding tool shown in FIG. 1 is comprised of the worktable 11 equipped with the headstock 12 and the tailstock 13 provided so that the opposite end of the cylindrical workpiece W can be rotatably supported. This worktable 11 is mounted on the bed 14 so as to be slidable in a direction parallel to the axis interconnecting the spindle 13a of the tailstock 13 and the spindle 12a of the headstock 12. The sliding of the worktable 11 includes a ball screw 15 mounted on the bed 14, a servomotor 16 for sliding the worktable and rotating the ball screw 15, and a nut 17 paired with the ball screw. Is achieved by means of sliding platform.

The grinding machine 19 is rotatably supported by a table 18 mounted on the bed 21 to move the grinding machine 19 in a direction perpendicular to the axis of the cylindrical workpiece. Like the workbench 11, the grinder support 18 is also moved by a grinding machine table feed servomotor 23 for rotating the ball screw 22, the ball screw and the nut 24. A diameter measuring device 30 for measuring the diameter of the cylindrical workpiece W is located adjacent to the grinding table 18. As shown in FIG. 2, the diameter measuring device 30 includes an upper sensor 31a engaged with the upper circumference of the cylindrical workpiece W, a lower sensor 31b in contact with the lower circumference of the workpiece W, And a measuring unit composed of a sensor drive unit which moves the lower sensor 31b in the vertical direction in accordance with the diameter of the work W. FIG. The sensor drive unit is composed of a piston 32 connected to the lower sensor and an actuator 33 for driving the piston 32 in the vertical direction.

The measuring unit and the sensor drive unit are slidably mounted on the support base 35 arranged near the grinding table 18 and supported by a support unit 34 which is slidable in a direction perpendicular to the axis of the cylindrical workpiece W. have. The hydraulic cylinder 36 is provided to reciprocate the support frame 34.

On both sides of the cylindrical workpiece W, there is provided a warpage suppression device 40 and a grinder table 18 including a number of supporting members in contact with the outer surface of the workpiece W. As shown in FIG. As shown in FIG. 3, the warpage suppression device 40 is horizontal for the vertical support member 41b that engages with the lower circumferential surface of the work W and on the opposite side of the grinding machine 19 with respect to the work W. FIG. It is comprised by the support member 41a.

Each of the horizontal support members 41a is fastened to a sliding block 42 formed with a threaded opening not shown. The sliding block 42 is supported by the support bracket 43 so as to be able to slide in the horizontal direction and the threaded shaft 44 engages into the threaded opening. The threaded shaft 44 is driven by the horizontal torque motor 45. Each of the vertical support members 41b is mounted on one end of the swing lever 46 supported by the support bracket 43 so as to be pivotable in the vertical direction. The lower end of the vertical threaded shaft 47 engages with the other end of the pivoting lever to pivot the pivoting lever 46 in the vertical direction by the vertical movement of the threaded shaft 47. The upper end of the threaded shaft 47 is screwed into the threaded opening 48 of the rotary block 49 which is driven by the vertical torque motor 51 and rotatably supported by the support bracket 43.

The plurality of warp suppressors 40 configured as described above are arranged at appropriate intervals along the length of the cylindrical work piece W. As shown in FIG.

The workpiece table drive mutter 16, the grinder support drive motor 23, the actuator 33 of the diameter measuring device 30, the horizontal torque motor 45 and the vertical torque motor 51 of the bending suppression device are control devices. 60, for example, controlled by a computer numerical controller (CNC).

The configuration of the control device 60 is shown in the block diagram shown in FIG. As shown, the control device 60 is comprised of the measurement input unit 61 into which the measured value of the diameter of the cylindrical workpiece W is input along the axial direction. The measured pressure unit 61 is connected to the bench drive motor controller 62 and the diameter measuring device 30 of the bench drive motor 16. Therefore, the position signal indicating the position of the work bench 11 from the work table drive motor controller 62 is input to the measured value input unit 61, that is, the position signal of the cylindrical work W and the diameter value measured from the diameter measuring device 30 are input. do.

The diameter value measured along the axial direction of the workpiece W input to the measurement value input unit 61 is stored in the memory means 63.

The control device 60 consists of a central processing unit (CPU) 64 which compares the measured diameter value stored in the storage means 63 to determine whether the difference between the maximum and minimum diameters is within an acceptable range. have. A calibration value calculator 65 is provided for calculating the corrected grinding amount at each axial position of the work W when the difference between the maximum and minimum values of the work diameter is outside the allowable range.

The calibration value calculator 65 is connected to a grinder drive motor controller 66 which controls the grinder drive motor 23 so that the grinder drive motor supplies a control signal to this motor in order to achieve the desired corrective grinding operation.

The control device is further composed of a controller 67 connected to the CPU 64 for controlling the contact pressure of the supporting members 41a and 41b of the bending suppression device 40.

Operation of the control device 60 will now be described with reference to the flowchart shown in FIG. When the operation switch (not shown) of the cylinder grinding machine is turned ON, the vertical torque motor 51 and the horizontal torque motor 45 of the bending suppression device 40 have a cylindrical shape of the horizontal support member 41a and the vertical support member 41b. It is excited to pressurize in step S1 with continuous pressure with respect to the workpiece | work W.

In step S2, the calculation operation is started while the warping of the workpiece W is suppressed and the grinding machine 10 is rotated. During the grinding operation, since the diameter of the cylindrical workpiece W gradually decreases, it is necessary to adjust the pressures of the supporting members 41a and 41b so that the contact pressure is kept at a constant value (step 3). According to one method of adjusting the contact pressure of the supporting members 41a and 41b, the horizontal and vertical torque motors 45 and 51 are controlled until the torque of this torque motor reaches a predetermined value. Since the plurality of supporting members 41a and 41b are provided along the axial direction of the work W, the contact pressures of the supporting members 41a and 41b are axial in the grinding machine 19 so as to maintain the contact pressure at a constant value. It is adjusted according to the position. The grinding operation starts with rough grinding and ends at step 4 by performing a fine finishing grinding. Upon completion of the grinding operation, the grinding machine 19 is retracted from the workpiece in step S5. The hydraulic cylinder 36 of the diameter measuring device 30 acts to move the support frame 34 toward the cylindrical workpiece W in order to sandwich the workpiece W between the upper and lower sensors 31a and 31b. The diameter of the workpiece W is measured by the amount of movement of the actuator 33 required to move the upper and lower sensors 31a and 31b until the sensor contacts the upper and lower circumferences of the workpiece W (step S6). in).

The diameter measurement is measured at various points along the axis of the workpiece W while the work bench 11 and the diameter measuring device 30 are moved relatively in the axial direction, and the diameter value at each point is stored in the storage means 63.

The measured diameter values stored in the storage means 63 are compared with each other in the CPU 64, and it is determined in step S7 whether the difference between the maximum and minimum diameters is within the allowable range. If the difference between the diameters is not within the allowable range, a cylinder of the desired diameter cannot be obtained, which means that grinding correction is required.

In this case, the measured diameters at each location are compared with each other to obtain the minimum diameter Dmin in step S8. In step S9, the grinding correction value is calculated by the correction value calculating device 65 at each axis point. This correction is calculated using the equation

Where an: grinding correction

Dn: diameter at position n in the axial direction.

The calculated correction value is sent to the grinder drive motor controller 66 to correct the operation in step S10, and moves the grinder 19 in the axial direction by the drive motor 23.

After correcting the grinding operation, the diameter is measured again. When the diameter difference is reduced to within tolerance, the grinding cycle ends.

As described above, according to this embodiment, the diameter measurement 30 measures the diameter of the workpiece ground at various points in the axial direction of the cylindrical workpiece and achieves corrective grinding so that the diameter difference is reduced to be within an acceptable range. It is provided. For this reason, it is precisely ground when the axial direction of the movement of the workpiece or the grinding deflection and the axis of the workpiece W are not parallel due to insufficient contact, ie eccentric support of the workpiece with headstock and tailstock. You get a cylinder.

Since it is possible to move and adjust the supporting members 41a and 41b of the deflection control device in accordance with the feed amount during the grinding operation of the grinding machine 19, the supporting members 41a and 41b are always provided with respect to the workpiece W at a constant pressure. It is possible to pressurize, thus effectively preventing small vibrations during grinding.

In the above-described embodiment, the grinding table 18 is held fixed relative to the axial direction of the workpiece W and the workpiece is moved axially by the movement of the worktable 11. However, it is possible to move the grinder table 18 in the axial direction while maintaining the workpiece without moving in the axial direction. With this variant, the workbench 11 and the workbench drive motor 16 are not necessary and only need to move the grinder table 18 parallel to the axis of the cylindrical workpiece W.

Although the specific structure of the diameter measuring device is shown in FIG. 2, any structure can be used as long as the diameter of the cylindrical workpiece can be measured at various positions in the axial direction.

6 through 8 show another embodiment of the present invention. In this figure, reference numerals denote the same elements shown in the first embodiment.

In this embodiment, the touch sensor 70 is provided so that the horizontal support member 41a (see FIG. 3) of the bending suppression device 40 detects the contact with respect to the cylindrical workpiece W. As shown in FIG. More specifically, as shown in the seventh illustration, the touch sensor device 70 is a touch sensor 71 in contact with the circumference of the workpiece W on the side opposite the side where the horizontal support member 41a is in contact with the circumference of the workpiece. It consists of). The touch sensor 71 supported by the tip of the servo motor 73 and the rod-shaped support frame 72 is connected to the other end of the support frame 72 to move. The purpose of the servomotor 73 is to move the support frame in the longitudinal direction and mount it on the upper support 74 inclined on the grinding table 18.

In this variant, the warpage inhibiting device 40 is provided at the axial center of the cylindrical workpiece W. As shown in FIG. The worktable drive motor 16, the grinding machine drive motor 23, the touch sensor 71, the servomotor 73 and the servomotors 45 and 51 of the bending suppression device 40 are connected to a controller such as a CNC 80. do.

As shown in the block diagram of FIG. 8, the controller 80 is a touch sensor controller 81 for controlling the servo motor 73 of the touch sensor device 70 and a support member of the vibration suppressor 40. It is comprised by the warpage suppression apparatus 82 which controls the conveyance of 42a, 41b).

These controllers 81 and 82 are connected to the CPU 83 connected to the worktable drive motor controller 85 and the grinder drive motor controller 86 in the same manner as in the first embodiment. The control apparatus 80 is further comprised by the memory means 84 connected to CPU83.

The operation of this variant embodiment will now be described with reference to the flow chart shown in FIG.

By connecting the power switch (not shown) of the cylinder grinding device, the workbench drive motor 16 is excited to move the workbench 11 until the touch sensor device 70 is moved to the position facing the bending suppression device 40. (Step P1). Then, the servomotor 73 is excited to drive the touch sensor device 70 to project the support frame 72 to move the touch sensor 71 to a position perpendicular to the axis of the workpiece W. FIG. (Step P2).

The grinder drive motor 23 is driven until the touch sensor 71 comes into contact with the workpiece W to advance the grinder table 18. In contact, the motor 23 is stopped at step P3. In step P4, the grinder drive motor 23 is excited to retract the grinder table 18 until the touch sensor 71 is released from the workpiece W. As shown in FIG.

At the time of release, the grinder drive motor 23 is immediately stopped at step P4. Then, in step P5, the horizontal torque motor 45 of the bending suppression device 40 is operated to advance the horizontal support member 41a. After engaging the support members 41a and 41b with respect to the cylindrical workpiece W, when the workpiece is bent, the warpage is detected by the touch sensor 71. More specifically, it is determined in step P6 whether or not the touch sensor 71 (usually kept in contact with the workpiece) is in contact with the workpiece W. FIG. As the work W is bent to contact the touch sensor, at step P7, the movement of the horizontal stop member 41a is immediately stopped. In step P8 the servomotor 73 of the touch sensor 70 is now actuated so that the touch sensor 71 is separated from the workpiece W. FIG.

As described above, after the horizontal support member is optimally engaged with the outer circumference of the work W and the grinding machine 19 is rotated, the grinding operation is started in step P9.

According to this variant, it is possible for the contact force of the support member 41a to be substantially reduced to zero, so that the horizontal support member 41a of the bending restraining device 40 is engaged with the outer circumference of the work W under optimum conditions. It becomes possible to do this, and it becomes possible to prevent the small vibration of the workpiece | work W during grinding.

This variant is particularly effective for grinding cylindrical workpieces with relatively small diameters and large lengths.

As described above, according to the control device of the present invention, it is possible to achieve orthodontic grinding so that the diameter of the workpiece to be ground is within an acceptable range, whereby high precision grinding can be obtained. Moreover, as the supporting member of the bending restraining device is pressed against the workpiece at a constant pressure, it is possible to prevent the occurrence of small vibration during grinding.

As described above, according to the present invention, it is possible to precisely grind a thin cylindrical workpiece.

Claims (4)

A cylinder comprising a continuum support rotatably supporting a grinding machine for grinding cylindrical workpieces, means for axially transporting the cylinder and conveying the grinding wheel support in a direction perpendicular to the axis of the cylindrical workpiece, and a workpiece diameter measuring means. A method of controlling a grinding machine comprising the steps of: measuring the cylindrical workpiece, in accordance with a diameter signal sent from the diameter measuring means and a position signal at a position perpendicular to the axis of the workpiece, at each position along the axis of the workpiece; Calculating the diameter of the workpiece, controlling the feed amount of the grinder support such that the diameter error of the workpiece at each position is smaller than the allowable, and suppressing the warp of the workpiece and applying it to the cylindrical workpiece by the engagement means As a step to adjust the losing engagement force Cylindrical grinding machine control method, characterized in that that. Grinder support for rotatably supporting the grinding machine for grinding cylindrical workpieces; Means for transferring the grinder in the axial direction and for transporting the grinder support in the direction perpendicular to the axis of the cylindrical workpiece; Workpiece diameter measuring means for the circumference of the cylindrical workpiece A method of controlling a cylinder grinding machine comprising a workpiece diameter measuring means comprising a touch sensor suitable for detecting engagement of a workpiece, and a workpiece warp suppressing means comprising a support member adapted to engage the circumference of the cylindrical workpiece. Moving the grinder support to a position where the touch sensor faces the circumference of the cylindrical workpiece, projecting the touch sensor towards the circumference, advancing the grinder support until the touch sensor contacts the workpiece. Making a phase from the workpiece Retracting the grinder support to disengage the touch sensor, advancing the stop member of the workpiece bending suppression means to allow the stop member to support the workpiece, determining whether the touch sensor is in contact; Stopping the advancement of the support member of the bending restraining means, withdrawing the touch sensor, and starting the grinding operation. A grinder support for rotatably supporting a grinding machine for grinding a cylindrical workpiece, means for transferring the grinder support in a direction perpendicular to the axis of the cylindrical workpiece, and for moving the cylindrical workpiece and the grinder relatively in an axial direction A control device for a cylinder grinding machine comprising a means, comprising: means for measuring the diameter of the cylindrical workpiece, the feed amount and relative movement of the grinder support such that the diameter error of the workpiece at each position is smaller than an allowable value; Control means for controlling the means, arranged on the side facing the grinder support, including bending means for engaging the cylindrical workpiece from both sides of the workpiece, and adjusting the engagement force of the engagement means. To prevent the warpage A control means connected to the stage, wherein the relatively moving means is in accordance with a diameter signal sent from the diameter measuring means and a position signal at each axial position of the workpiece sent from the relatively moving means. And means connected to said diameter measuring means and said grinder feed means for calculating the diameter of said workpiece at each position along the axis of the workpiece. 4. The cylinder grinding machine control device according to claim 3, wherein the engagement means is composed of a plurality of axially spaced support members operated by the control device.