KR100865758B1 - An evaluation test apparatus for turret of lathe - Google Patents

Abstract

An apparatus for testing performance a turret for a lathe is provided to evaluate performance of a turret by measuring a rotating angle, vibration and flatness of the dynamic turret and measuring stiffness corresponding to variation in height of a specimen in vertical and horizontal directions when force is applied to a stationary turret. An apparatus for testing performance a turret for a lathe comprises a table(10) and a rotating unit(20). The rotating unit is disposed at the center portion of the table and has a proximity sensor to control transmission of power according to whether a turret(60) is clamped. First support members(30) are disposed at both sides of the table about the rotating unit and a load cell(31) and a first gap sensor(32) to measure stiffness of the turret. A second support member(40) is disposed at the center of the table so that the second support member is positioned in the front of the turret and has an angle encoder for measuring a rotating angel of the turret and a second gap sensor for measuring flatness of the turret. A center controller controls the rotating unit and the load cell, and displays a result based on output data from the angle encoder and the sensors.

Description

An Evaluation Test Apparatus For Turret Of Lathe}

1 is a plan view of a shelf turret performance evaluation test apparatus according to the present invention;

2 is a side configuration diagram of a shelf turret performance evaluation test apparatus according to the present invention;

Figure 3a is an internal configuration diagram of the rotating part extracted in Figure 1,

Figure 3b is a block diagram of a shelf turret performance evaluation test apparatus according to the invention,

Figure 4a is a graph showing the rigidity of the turret according to the hydraulic change,

Figure 4b is a graph showing the repeatability according to the hydraulic change,

Figure 5a is a graph measuring the degree of division error of the turret,

5B is a graph showing the occurrence of clamping shock due to the degree of division error.

<Description of the symbols for the main parts of the drawings>

10: table 20: rotating part

21: servomotor 22: clamp

221: hydraulic cylinder 222: piston rod

23: proximity sensor 231: bracket

24: vibration sensor 30: first support

31: load cell 32: first gap sensor

40: second support 41: angle encoder

42: second gap sensor 50: central control unit

51: display 60: turret

61: Cubic Coupling 62: Test Specimen

The present invention relates to a lathe turret performance evaluation test apparatus for evaluating the reliability of the lathe turret, for this purpose, the turret dynamic by forward / reverse rotation at equal intervals by the rotation angle according to the degree of division of the tool mounting of the turret The turret's performance can be evaluated by measuring the rotation angle, vibration, and flatness, and by measuring the stiffness according to the height change of the test piece provided on the opposite surface by applying a force to the static turret. .

In general, the Turret (Rotary Tool Stand) installed on the CNC Numerical Control Lathe and the NC Lathe is a servo motor. The tool required by the user rotates the turret and places it on the top or side of the workpiece.

The tool located on the upper side or the side of the workpiece performs hole processing or cutting while moving in the rotating workpiece.

Such a turret replaces many tools according to the machining shape of the workpiece, and the tools to be replaced are determined according to the exact position of the workpiece.

Although the turret is the most important part of the lathe, the load due to breakage and abrasion of the Curvic Coupling of the turret, poor assembly of parts, wear and tear of parts due to repeated positive and reverse loads and eccentric tool loading There is a problem that a backlash occurs due to an imbalance.

In addition, another cause of malfunction of the turret is leakage due to malfunction of the proximity sensor due to rotational vibration or wear of sealing components such as O-rings.

Therefore, a test apparatus capable of evaluating the performance of the turret is required to identify the cause of the turret malfunction and find the optimum operating conditions.

The present invention has been made in view of the above problems, an object of the present invention is to rotate the forward and reverse rotation at equal intervals equal to the rotation angle in accordance with the degree of division of the tool mounting of the turret, the rotation angle of the dynamic and the vibration, In addition, it provides a shelf turret performance evaluation test apparatus that can measure the degree of flatness, and to measure the stiffness according to the height change of the test piece provided on the opposite surface by applying a force to the static turret. It is.

Shelf turret performance evaluation test apparatus of the present invention for solving the above technical problem, in the test apparatus for evaluating the reliability of the lathe turret,

And a table disposed at the center of the table, and having a built-in proximity sensor to control whether power is transmitted depending on whether or not the turret is clamped and divided by rotation angles according to the degree of division of the turret. Rotating parts for forward / reverse rotation at predetermined intervals; and disposed on both sides of the table with the rotation part as the center, and up / down / upside down of test pieces mounted on the opposite side by applying a force to the side of the static turret when the clamping of the turret A first support on which a load cell and a first gap sensor are mounted to detect a change in height of the left / right and a turret stiffness; and a center of the table positioned in front of the turret to rotate the turret A second support on which an angle encoder for measuring an angle and a second gap sensor for measuring a front planarity of the turret are mounted; And a central controller which controls the rotating unit and the load cell, analyzes and displays the result through the angle encoder and the output data of each sensor.

Preferably, the rotating part further includes a vibration sensor that detects a flow of a bracket fixing the proximity sensor so as to measure a malfunction of the proximity sensor through rotational vibration.

The rotating unit may transmit the rotational force to the turret according to the clamping operation of the clamp and the horizontal movement to perform the clamping / unclamping operation on the inner surface of the cubic coupling extending to the other surface of the turret, and the clamp detected by the proximity sensor It is preferably configured to further include a servo motor.

The clamp is preferably composed of a hydraulic cylinder and a piston rod for reciprocating the inside of the hydraulic cylinder.

In the above, the first gap sensor is preferably configured as a pair installed in the vertical plane and the horizontal plane of the "b" shape so as to detect the change in height, down / left / right of the test piece.

The invention will become more apparent through the preferred embodiments described below with reference to the accompanying drawings. Hereinafter will be described in detail to enable those skilled in the art to easily understand and reproduce through embodiments of the present invention.

1 is a plan configuration diagram of a shelf turret performance evaluation test apparatus according to the present invention, Figure 2 is a side configuration diagram of a shelf turret performance evaluation test apparatus according to the present invention, Figure 3a is an internal configuration of the rotating portion extracted from FIG. Figure 3b is a block diagram of a shelf turret performance evaluation test apparatus according to the invention.

As shown in Figures 1 to 3b, the present invention measures the rotation angle, the vibration and the flatness of the dynamic turret by rotating the forward / reverse at equal intervals by the rotation angle according to the degree of tool mounting of the turret In addition, the present invention relates to a shelf turret performance evaluation test apparatus capable of evaluating the performance and reliability of the turret by measuring the stiffness according to the height change of the test piece provided on the opposite surface by applying a force to the static turret.

Such a test apparatus is large so that the vibration of the turret 60 can be measured by rotating the table 10 and the turret 60 at regular intervals equal to the rotation angle according to the degree of tool mounting of the turret 60. By applying a force to the rotating part 20 with the vibration sensor 24 and the static turret 60, the rigidity of the test piece 62 provided on the opposite side of the turret 60 can be measured. The first support 30 to which the load cell 31 and the first gap sensor 32 are mounted, the angle of rotation of the dynamic turret 60, and the angle encoder 41 to measure the flatness. And a second support 40 on which the second gap sensor 42 is mounted, the rotation unit 20 is controlled, an angle encoder 41, a load cell 31, and each sensor 23, 24, 32, The central control unit 50 is configured to display and analyze the results in a table and a graph through the output data of 42).

Here, the table 10 is preferably composed of a surface plate for measuring the precision of the turret 60.

And the rotating unit 20 is disposed in the central portion of the table 10, the proximity sensor (Proximity Sensor) 23 is built so that it can control the transmission of power in accordance with the clamping / non-clamping of the turret 60 , When clamping, it functions to forward / reverse rotation at equal intervals by rotation angles according to the tool mounting division degree of the turret 60.

The rotating part 20 is a clamp 22 for horizontally moving to perform an operation of clamping / unclamping to the inner surface of the cubic coupling 61 extending to the other surface of the turret 60, the proximity sensor 23 In accordance with the clamping operation of the clamp 22 is detected in the servo motor 21 for transmitting a rotational force to the turret 60 is a built-in structure.

More specifically, the clamp 22 is composed of a hydraulic cylinder 221, and a piston rod 222 for reciprocating the inside of the hydraulic cylinder 221, the proximity sensor 23 is a horizontal piston rod 222 It is installed close to the free end of the) and detects whether the clamping / unclamping of the piston rod 222 is performed to control whether the servo motor 21 is driven through the central controller 50.

As described above, the configuration of the rotating part 20 is a structure for achieving the same condition as the CNC lathe, and the rotating part 20 can measure the malfunction of the proximity sensor 23 due to the rotational vibration of the turret 60. The vibration sensor (Accelerometer Sensor) 24 for detecting the flow of the bracket 231 for fixing the proximity sensor 23 is built.

In addition, the first support 30 is disposed on both sides of the table 10, the image of the test piece 62 mounted on the opposite side by applying a force to the side of the static turret 60 when the clamping of the turret 60 The load cell 31 and the first gap sensor 32 are mounted to detect the height change of the lower / left / right and to measure the rigidity of the turret 60. In this structure, the wear of the cubic coupling 61 of the turret 60 and the hydraulic drop of the hydraulic cylinder 221 can be known according to the change of the test piece 62.

Here, the first support 30 on which the first gap sensor 32 is mounted has a “a” shape and has a “a” shape so as to detect a change in height of the test piece 62 in the up / down / left / right directions. It consists of a pair installed in the vertical plane and horizontal plane of each.

On the other hand, the second support 40 is disposed in the center of the table 10 to be located in front of the turret 60, the rotation angle measurement according to the degree of division of the rotating turret 60, the front of the turret 60 An angle encoder 41 and a second gap sensor 42 are mounted to measure the flatness.

In addition, the central control unit 50 controls the rotating unit 20, and through the output data of the angle encoder 41, the load cell 31, and each sensor (23, 24, 32, 42), Analyzes the result in a graph and displays 51.

Hereinafter, an example of evaluating the reliability of the lathe turret performance evaluation test apparatus according to the present invention will be briefly described.

Prior to the description of the turret reliability evaluation of the turret is measured using the angle encoder and the degree of repetition, the deviation from the reference value can be expected to wear wear of the Cubic Coupling, wear of the O-ring, hydraulic drop, etc. . If the wear of the cubic coupling occurs, the stiffness of the turret is reduced. In order to measure this, it is possible to evaluate the wear of the Curvic Coupling by grasping the change in stiffness by measuring the value that is deformed after applying a load by using a load cell from the side. In addition, it can be measured using an accelerometer sensor and a thermocouple (not shown) to measure the vibration of the bracket of the proximity sensor and the temperature rise generated during continuous operation.

EXAMPLE

Metric Evaluation item Reference value Experiment method How to measure Division degree Coupling wear O-ring wear, hydraulic drop 0.01 ° Total Deviation / 7 Turns Angle encoder Repeatability Same as above 0.005 ° Back lash error Flatness Assembly state 5um Total Deviation / 7 Turns Second gap sensor Rigidity Coupling wear 200 N / um 3 measurements First gap sensor load cell vibration Proximity sensor malfunction                             Vibration sensor

[Table 1] is a reliability evaluation and measurement items for the reliability evaluation of the turret.

First, the radial stiffness of the turret is determined by the change in the hydraulic pressure acting on the Curvic Coupling used to measure the hydraulic pressure and the stiffness / repeatability.

The hydraulic pressure used here is 20 ~ 70kg / cm ² and the lateral force exerted by the load cell is 400N.

As a result, as shown in Figure 4a, the change in the stiffness with respect to the change in the hydraulic pressure can be seen that the optimum stiffness for maintaining the stiffness of the turret needs a hydraulic pressure of at least 40kg / cm ² . Hydraulic pressure also has a great effect on repeatability. In other words, if the hydraulic pressure is too small, the tightening force of the cubic coupling is small, and the repeatability becomes worse. However, using too large hydraulic pressure is also undesirable from the structural point of view.

As a result of the change in the degree of repetition with respect to the hydraulic pressure, as shown in Figure 4b, in the hydraulic pressure of 50kg / cm ² or more, the repetition degree meets the standard value and less than it was found that the hydraulic pressure 50kg / cm ² is suitable in terms of repeatability .

In addition, as shown in FIG. 5A, the turret divides the thermal resolution and the thermal expansion, and the average value of the index errors is measured by measuring angles for each index after 8 hours of continuous operation.

The reference index is 9, but it can be seen that the tendency of indexing errors is not consistent. As a result of the measurement, even when considering the offset value of the encoder by the index, it was found that there was an indexing error of about 0.03 °. In addition, since the error does not occur in only one direction, it can be determined that the error is not due to the bias of the cubic coupling.

In order to know the impact generation amount by the degree of division, the index generation was repeated by rotating the index 3 and the index 9 by 180 ° to measure the impact generation. Vibration was measured by a vibration sensor mounted on the bracket that fixed the proximity sensor.

As a result, as shown in Figure 5b it can be seen that the impact of the clamping at the time of three indexing compared to the 9th indexing is almost 10 times or more. This supports the credibility of the results of the partitioning test measured earlier.

When indexing is performed continuously, thermal expansion occurs in the turret, which can be measured by the first and second gap sensors installed in the radial and axial directions. After 72 hours of operation, thermal expansion of 0.5 µm in the radial direction and 1.0 µm in the axial direction was measured. In subsequent continuous operation, no further thermal expansion proceeded.

Therefore, turret failure is defined as when the hydraulic pressure is below 60kg / cm ² , when the repeatability is over 0.005 °, when the thermal expansion in the axial and radial directions is over 1.0um and when the turret stops. can do.

As described above, according to the shelf turret performance evaluation test apparatus according to the present invention, it is possible to determine the cause of the malfunction of the turret to find the optimum operating conditions and increase the life of the device.

In addition, the turret can be rotated forward and backward at equal intervals by the rotation angle according to the tool mounting division degree of the turret to measure the rotation angle, vibration, and flatness of the dynamic turret. By applying a force to the test piece on the opposite side of the test specimen, the strength of the turret according to the change in the height of the top / bottom / left / right has the advantage of performing the performance evaluation of the turret.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, various other modifications and variations may be made without departing from the spirit and scope of the invention. Accordingly, it is intended that the appended claims cover such modifications and variations as fall within the true scope of the invention.

Claims (5)

In the test apparatus for evaluating the reliability of the lathe turret, Table 10; It is disposed at the center of the table 10, the proximity sensor 23 is built to control the transmission of power depending on whether the turret 60 is clamped, the tool mounting of the turret 60 when clamping Rotating portion 20 for forward / reverse rotation at equal intervals by rotation angle according to the degree of division; It is arranged on both sides of the table 10 with the rotation part 20 as the center, and the image of the test piece 62 mounted on the opposite side by applying a force to the side of the static turret 60 when unclamping the turret 60 A first support 30 to which the load cell 31 and the first gap sensor 32 are mounted to detect the height change of the lower / left / right side so as to measure the rigidity of the turret 60; An angle encoder 41 disposed at the center of the table 10 to be positioned in front of the turret 60 and measuring the rotation angle of the rotating turret 60, and a second gap sensor for measuring the front flatness of the turret ( A second support 40 on which 42 is mounted; And The central control unit 50 controls the rotating unit 20 and the load cell 31, analyzes and displays the result through the angle encoder 41 and the output data of the sensors 23, 24, 32, and 42. Shelf turret performance evaluation test apparatus, characterized in that comprises a. The method of claim 1, The rotating unit 20 is further provided with a vibration sensor 24 for detecting the flow of the bracket 231 for fixing the proximity sensor 23 to measure the malfunction of the proximity sensor 23 through the rotation vibration. Lathe turret performance evaluation tester. The method of claim 1, The rotating part 20 is a clamp 22 for horizontally moving to perform the operation of clamping / unclamping to the inner surface of the cubic coupling 61 extending to the other surface of the turret 60, Lathe turret performance evaluation test apparatus, characterized in that it further comprises a servo motor (21) capable of transmitting a rotational force to the turret (60) in accordance with the clamping operation of the clamp (22) sensed by the proximity sensor (23). The method of claim 3, wherein The clamp 22 is a hydraulic cylinder (221), the shelf turret performance evaluation test apparatus, characterized in that composed of a piston rod 222 for reciprocating the interior of the hydraulic cylinder (221). The method of claim 1, The first gap sensor 32 is a turret turret performance, characterized in that composed of a pair installed on the vertical plane and horizontal plane of the "b" shape so as to detect the change in height of the top / bottom / left / right of the test piece 62 Evaluation test device.

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