KR20220133409A - Device for modifying processing error of machine tool and method thereof - Google Patents

Abstract

The present invention relates to a correction device for machining errors of a machine tool. The correction device for machining errors of a machine tool comprises: a bed; a main spindle installed on the bed to clamp a workpiece to machine the workpiece; a support unit installed on the bed to be horizontally moved while horizontally facing the main spindle to support or clamp the workpiece; a column having a machining unit allowing a tool to be mounted thereon to machine the workpiece, and installed on the bed to be horizontally moved; a sensing unit sensing real-time phase changes of the support unit and the column in accordance with movements of the support unit and the column; and a control unit correcting machining errors resulting from phase changes of the support unit and the column sensed by the sensing unit. The control unit can correct machining errors caused by rising of the workpiece and defection of the bed caused in connection with the movements of the support unit and the column in real time.

Description

Device for modifying processing error of machine tool and method thereof

The present invention relates to an apparatus and a method for correcting machining errors of a machine tool, and more particularly, to the deflection of the bed and lifting of the work piece that occur in conjunction with the phase change through the movement of the support such as the column and sub spindle or tailstock. The present invention relates to a machining error correction apparatus and correction method for a machine tool that can automatically correct machining errors in real time to improve machining precision and increase productivity according to a reduction in non-machining time.

In general, a machine tool refers to a machine used for the purpose of machining a metal/non-metal workpiece into a desired shape and size using an appropriate tool by various cutting or non-cutting methods.

Various types of machine tools, including turning centers, vertical/horizontal machining centers, door machining centers, Swiss turns, electric discharge machines, horizontal NC boring machines, CNC lathes, etc., are widely used in various industrial sites for their respective purposes.

In general, various types of machine tools currently used have an operation panel to which a numerical control (NC) or computerized numerical control (CNC) technology is applied. Such an operation panel is provided with various function switches or buttons and a monitor.

In addition, the machine tool is a table on which a workpiece material is seated and transferred for processing the workpiece, a pallet for preparing the workpiece before processing, a spindle that rotates with a tool or workpiece combined, a tailstock for supporting the workpiece, etc. during processing, a vibration isolator etc. are provided.

In general, in a machine tool, a table, a tool rest, a main shaft, a tailstock, a vibration isolator, etc. are provided with a conveying unit conveying along a conveying axis in order to perform various machining.

In addition, in general, a machine tool uses a plurality of tools for various processing, and a tool magazine or a turret is used as a tool storage place for storing and storing a plurality of tools.

Such a machine tool uses a plurality of tools for various processing, and a tool magazine is used in the form of a tool storage place storing a plurality of tools.

In addition, in general, a machine tool is provided with an automatic tool changer (ATC, Automatic Tool Changer) for withdrawing or receiving a specific tool from the tool magazine by the command of the numerical control unit in order to improve the productivity of the machine tool.

In addition, in general, a machine tool is provided with an automatic pallet changer (APC, Automatic Palette Changer) in order to minimize the non-working time. The automatic pallet changer (APC) automatically exchanges pallets between the workpiece machining area and the workpiece installation area. Pallets may be loaded with workpieces.

In addition, in general, machine tools are largely classified into turning centers and machining centers according to processing methods. In general, the turning center rotates the workpiece, and the machining center performs the machining of the workpiece while the tool rotates.

In general, a turning center refers to a machine tool that is equipped with an automatic tool changer, etc. and performs various processing by exchanging various types of tools. It is divided into a horizontal turning center.

Among conventional machine tools, especially in the case of a horizontal turning center, a column equipped with a milling spindle, a main spindle, and a sub-spindle or tailstock are installed on the top of the bed, and these columns, main spindle, sub-spindle, or tailstock are installed in the upper part of the bed with the transfer unit move by

As such, in the conventional horizontal machine tool, as structures such as columns and main spindles move on top of the bed, deflection of the bed occurs due to its own weight due to the relative position according to the movement of the structure, resulting in a machining error of the workpiece.

In addition, in horizontal machine tools, tailstocks are used to clamp the workpiece together with the main spindle, to clamp the workpiece separately from the main spindle, or to support the workpiece mounted on the main spindle. When the sub spindle or tailstock moves to support one free end of the work piece, the work piece is lifted by the thrust, resulting in machining error of the work piece.

In order to solve this problem, conventional machine tools have performed error correction for thermal deformation as described above, but processing errors due to bed deflection or lifting of the workpiece due to movement of structures such as columns, sub-spindles, or tailstocks are corrected in real time. There was a problem in that processing precision decreased as the correction was not made, and the rate of defective products increased, resulting in wastage of materials and resources.

In addition, the conventional machine tool has a problem in that it causes inconvenience to the operator and lowers the processing precision as it cannot correct in real time the processing error caused by the lifting of the work or the deflection of the bed due to the movement of the structure.

Moreover, in the conventional machine tool, some machining errors due to phase change were corrected by processing the test material in order to compensate at least a part of the machining error due to the deflection of the bed or the lifting of the work piece due to the movement of the structure, but it takes a lot of time to process the test material. There was a problem in that the maintenance cost increased as a result of the excessive cost, and the productivity decreased as the non-working time increased.

In addition, as the conventional machine tool performs only correction according to the processing of the test material, and cannot perform real-time processing error due to the phase change due to the deflection of the bed according to the real-time movement of the structure or the lifting of the workpiece, the precision and stability of the machine tool This decreases, and the processing precision cannot be accurately and quickly secured, resulting in consumer dissatisfaction and inconvenience to workers.

Therefore, machining of a machine tool that can automatically correct the machining error in real time according to the phase change caused by the lifting of the work or the deflection of the bed due to the real-time movement of structures such as columns, sub-spindles, or tailstocks. There is an urgent need to develop an error correction device and correction method.

Korean Patent Publication No. 10-2017-0132560 Korean Patent Publication No. 10-2020-0131727 Korean Patent Publication No. 10-2016-0077681

The present invention is to solve the above problems, and an object of the present invention is to deflect the bed due to weight and sub-spindle or sub-spindle or The phase error caused by the lifting of the workpiece by the thrust of the tailstock is derived in real time using the gyro acceleration sensor, and the phase error value and compensation value are calculated automatically and precisely and quickly to reduce the processing error of the workpiece. It is to provide a machining error correction device and correction method of a machine tool that can improve the machining precision of the machine tool by automatically calibrating in real time and increase productivity according to a reduction in non-working time.

In addition, another object of the present invention is to test the phase change caused by the lifting of the work piece by the thrust of the support part such as the sub spindle or the tailstock or the deflection of the bed that occurs in conjunction with the transfer of the bed or the structure such as the sub spindle or tailstock. Provides a machining error correction device and correction method for machine tools that can be automatically calculated without machining and corrected quickly for operator convenience, reduce maintenance and repair costs, and improve safety and reliability of machine tools will do

In order to achieve the object of the present invention, the processing error correction device of the machine tool according to the present invention is a bed; a main spindle installed on the bed to clamp the workpiece to process the workpiece; a support part which is horizontally movably installed on the bed while facing the main spindle in a horizontal direction to support or clamp the workpiece; a column on which a tool is mounted and provided with a processing unit for processing the workpiece and is horizontally movably installed on the bed; a sensing unit configured to sense a real-time phase change of the column and the support unit according to movement of the column and the support unit; and a control unit for correcting a processing error according to a phase change of the column and the support unit sensed by the sensing unit, wherein the control unit includes a deflection of the bed and the work piece occurring in association with movement of the column and the support unit It is possible to correct the machining error caused by the lifting in real time.

In addition, in another preferred embodiment of the machining error correcting apparatus for a machine tool according to the present invention, the sensing unit of the machining error correcting apparatus of the machine tool is installed in the column and caused by the deflection of the bed according to the real-time movement of the column. a first sensor unit for detecting a change in position and an angle of the column; and a second sensor unit installed on the support unit to sense a change in position and angle of the support unit according to the lifting of the work piece by a thrust acting on the work piece through real-time movement of the support unit.

In addition, in another preferred embodiment of the machining error correcting device for a machine tool according to the present invention, the control unit of the machining error correcting device for the machine tool stores data for correcting the machining error according to the phase change of the column and the support part a memory unit; a calculation unit for calculating a phase error due to deflection of the bed and lifting of the workpiece generated in association with movement of the column and the support unit through the data sensed by the sensing unit and the data stored in the memory unit; and calculating a correction value based on the phase error value calculated by the calculator and the data stored in the memory unit, and according to the correction value, the deflection of the bed and the work piece occurring in association with the movement of the column and the support unit. It may include; a correction unit that performs real-time correction of the processing error due to the lifting of the .

In addition, in another preferred embodiment of the machine tool machining error correcting device according to the present invention, the memory unit of the control unit of the machine tool machining error correcting device work data, tool data, theoretical data of the phase error, the first sensor unit and a basic data storage unit for storing data on the correction coefficient, the measurement program, and the processing program of the second sensor unit; a coordinate data storage unit for storing coordinate data for the column, the support unit, and the current position of the tool; a sensing data storage unit configured to store real-time phase data of the column and the support unit according to the sensing of the first sensor unit and the second sensor unit; and a real-time data storage unit configured to store, in real time, data on the phase error value calculated in real time by the calculator and the correction value calculated in real time by the correction unit.

In addition, in another preferred embodiment of the machining error correcting apparatus for a machine tool according to the present invention, the calculation unit of the control unit of the machining error correcting apparatus of the machine tool checks whether the column and the support are moved, and the column and the support a confirmation unit for sensing a phase change according to real-time movement of the column and the support unit with the sensing unit when the unit moves; Comparing the current coordinate data of the column and the support unit stored in the coordinate data storage unit and the phase data of the column and the support unit stored in the sensing data storage unit when the column or the support unit is moved as a result of the confirmation unit comparison department; a determination unit for determining whether a phase error occurs between the column and the support unit according to the comparison result of the comparison unit; and when a phase error of the column and the support part occurs according to the determination result of the determination unit, the phase error of the column is calculated as a horizontal phase error value and a vertical phase error value due to deflection of the bed, and the support part and a phase error calculation unit for calculating the phase error as a horizontal phase error value and a vertical phase error value due to lifting of the workpiece.

In addition, in another preferred embodiment of the machining error correcting apparatus for a machine tool according to the present invention, the correcting unit of the control unit of the machining error correcting apparatus of the machine tool is the phase error calculation value of the phase error calculating unit, stored in the real-time data storage unit a correction value calculation unit for calculating a correction value of the processing error through the data and the correction coefficient stored in the basic data storage unit; and a processing unit for correcting a processing error according to the correction value of the correction value calculation unit.

In addition, in another preferred embodiment of the machining error correction device of the machine tool according to the present invention, the control unit of the machining error correction device of the machine tool selects whether to correct the machining error according to the phase change of the column and the support part It may further include;

Further, in another preferred embodiment of the apparatus for correcting machining error of a machine tool according to the present invention, the support portion of the apparatus for correcting machining error of a machine tool may be formed as a sub-spindle or a tailstock.

Further, in another preferred embodiment of the machining error correcting device for a machine tool according to the present invention, both the first sensor unit and the second sensor unit of the machining error correcting device for the machine tool are formed of a gyro acceleration sensor, and the The phase error due to deflection is derived through the position error through the acceleration sensor of the first sensor unit and the angle error through the gyro sensor, and the phase error due to the lifting of the workpiece is the position error through the acceleration sensor of the second sensor unit and It can be derived through correction according to the angular error through the gyro sensor and the tool coordinates.

In order to achieve another object of the present invention, the machining error correction method of the machine tool according to the present invention comprises the steps of: storing data for correcting the machining error according to the phase change of the column and the support; checking whether the column and the support are moved in real time; sensing a phase change of the column and the support part when the real-time movement of the column and the support part occurs as a result of confirmation; comparing the current coordinate data of the column and the support part with the phase data of the column and the support part through sensing; determining whether a phase error occurs in the column and the support unit according to the comparison result; calculating a phase error of the column and the support part when the phase error of the column and the support part occurs as a result of the determination; calculating a correction value of the processing error based on the phase error calculation value and pre-stored data; and correcting in real time a machining error caused by deflection of the bed and lifting of the work piece generated in association with the movement of the column and the support part by the calculated correction value of the machining error.

In addition, in another preferred embodiment of the machining error correction method of the machine tool according to the present invention, the machining error correction method of the machine tool after the step of storing the data, the processing error correction according to the phase change of the column and the support It may further include; selecting whether to activate the function.

In addition, in another preferred embodiment of the machining error correction method of the machine tool according to the present invention, the machining error correction method of the machine tool calculates the machining error according to the phase change of the column and the support part before the step of storing the data The method may further include; calculating a correction coefficient based on the theoretical data and the measured data of the phase error in order to correct it.

The apparatus and method for correcting machining error of a machine tool according to the present invention are effective for the deflection of the bed due to weight and the thrust of the sub spindle or tailstock, which is generated in conjunction with the phase change through the movement of the column and the support such as the sub spindle or tailstock. The phase error caused by the lifting of the workpiece by the Compensation has the effect of improving the processing precision of the machine tool and minimizing the occurrence of defective products to prevent wastage of resources.

In addition, the apparatus and method for correcting machining errors of a machine tool according to the present invention provide a bed or sub-spindle or a support part such as a tailstock, etc. By automatically calculating and quickly compensating for the phase change due to lifting of the workpiece by the thrust without test machining, it is possible to maximize productivity and reduce maintenance costs and time by reducing non-machining time.

Furthermore, the machining error correction device and correction method for a machine tool according to the present invention automatically interlocks with the transfer of supports such as columns and sub-spindles or tailstocks to automatically process according to phase change due to deflection of the bed or lifting of the workpiece. As errors are corrected quickly and accurately in real time, the safety and reliability of machine tools can be improved.

In addition, the processing error correction apparatus and correction method of the machine tool according to the present invention does not require a separate test processing as it performs automatic correction, thereby promoting operator convenience and preventing safety accidents in advance. .

1 shows a conceptual diagram for explaining the configuration and principle of a machining error correction apparatus for a machine tool according to an embodiment of the present invention.
FIG. 2 is a conceptual diagram illustrating a method of calculating a correction coefficient in a state in which the workpiece is removed from FIG. 1 .
Figure 3 shows a block diagram of the control unit of the processing error correction device of the machine tool according to an embodiment of the present invention.
Figure 4 explains the principle of calculating the phase error due to the deflection of the bed of the machining error correction device of the machine tool according to an embodiment of the present invention.
5 and 6 explain the principle of calculating the phase error due to the lifting of the workpiece of the machining error correcting device of the machine tool according to an embodiment of the present invention.
7 is a flowchart illustrating a method for correcting a machining error of a machine tool according to an embodiment of the present invention.

Hereinafter, it will be described in detail with reference to the drawings of the processing error correction apparatus and the correction method of the machine tool according to an embodiment of the present invention. The embodiments introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. And, in the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numbers refer to like elements throughout.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of description.

The terminology used herein is for the purpose of describing the embodiments, and therefore is not intended to limit the present invention. In this specification, the singular also includes the plural, unless specifically stated otherwise in the phrase. As used herein, “comprise” and/or “comprising” refers to the presence of one or more other components, steps, operations and/or elements mentioned. or addition is not excluded.

1 shows a conceptual diagram for explaining the configuration and principle of a machining error correction apparatus for a machine tool according to an embodiment of the present invention, and FIG. 2 is for explaining a correction coefficient calculation method in a state in which the workpiece is removed in FIG. represents a conceptual diagram. Figure 3 shows a block diagram of the control unit of the processing error correction device of the machine tool according to an embodiment of the present invention. Figure 4 explains the principle of calculating the phase error due to the deflection of the bed of the machining error correction device of the machine tool according to an embodiment of the present invention. 5 and 6 explain the principle of calculating the phase error due to the lifting of the workpiece of the machining error correcting device of the machine tool according to an embodiment of the present invention. 7 is a flowchart illustrating a method for correcting a machining error of a machine tool according to an embodiment of the present invention.

Definitions of terms used below are as follows. "Horizontal direction" means the horizontal direction in the same member, that is, the X-axis direction in FIGS. 1 to 2, and "vertical direction" means the vertical direction in the same member while perpendicular to the horizontal direction, that is, Y in FIGS. axial direction. In addition, upper (upper) means an upward direction in the "vertical direction", that is, a direction toward the upper side of the Y-axis in FIGS. 2 means the direction toward the bottom of the Y-axis. In addition, "one side (one end)" and "the other end (other end)" mean either the tip of either side in the horizontal direction or the vertical direction in the same member.

A processing error correction apparatus for a machine tool according to the present invention will be described with reference to FIGS. 1 to 6 . 1 to 3, the machining error correction device of the machine tool according to the present invention is a bed 100, a column 200, a main spindle 300, a support unit 400, a sensing unit 500, and a control unit 600 .

The bed 100 is installed on the ground or the base. The bed 100 provides a space in which a column, a main spindle, a support, etc. are installed and moved.

The main spindle 300 is installed in the bed and clamps the work piece to machine the work piece 2 . That is, the main spindle is installed on one side of the bed to clamp one side of the work piece to rotate the work piece.

The support part 400 is horizontally movably installed on the bed while facing the main spindle in the horizontal direction (X-axis direction) to support or clamp the work piece. That is, the support part 400 is movably installed on the upper side of the bed so as to be adjacent to or away from the main spindle while being horizontally opposed to the main spindle on the other side of the bed to clamp the work piece or support the work piece.

Although not necessarily limited thereto, the support part of the machining error compensating device for a machine tool according to an embodiment of the present invention may be formed of a sub spindle clamping or supporting the workpiece or a tailstock for pressing and supporting the workpiece.

The column 200 is provided with a processing unit 210 for processing the workpiece 2 in which the tool 220 is mounted, and is installed to be horizontally movable on the bed. That is, the column is provided with a processing unit 210 such as a milling spindle to which various tools stored in a magazine through an ATC or the like are detachably mounted in order to variously process the workpiece, and horizontally or in the width direction from the upper part of the bed. Move. In addition, the machining portion moves in the vertical direction along the column in the height direction. Accordingly, various types of workpiece machining can be performed freely.

The sensing unit 500 senses a real-time phase change of the column and the support according to the movement of the column and the support.

The control unit 600 corrects a processing error according to a phase change of the column and the support unit sensed by the sensing unit. That is, the control unit corrects in real time the processing error caused by the deflection of the bed and the lifting of the workpiece, which occur in conjunction with the movement of the column and the support. Specifically, the control unit controls the phase caused by the deflection of the bed due to weight and lifting of the workpiece by the thrust of the sub-spindle or tailstock, which occurs in conjunction with the phase change through the movement of the column and the support structure such as the sub-spindle or tailstock. The error is derived in real time using the sensing unit formed by the gyro acceleration sensor and automatically calculated to automatically and precisely and quickly calculate the phase error value and correction value to automatically correct the machining error of the workpiece in real time.

Accordingly, the apparatus for correcting machining error of a machine tool according to the present invention is the deflection of the bed due to weight and the thrust of the sub spindle or tailstock, which is generated in conjunction with the phase change through the movement of the column and the support structure such as the sub spindle or tailstock. The phase error caused by the lifting of the workpiece by the to improve the machining precision of the machine tool, minimize the occurrence of defective products to prevent wastage of resources, and automatically calculate the compensation value through calculation without test machining to maximize productivity by reducing non-working time and maintain It can reduce maintenance cost and time, and maximize the stability and reliability of the machine tool.

In addition, as shown in FIGS. 1 and 2 , the sensing unit 500 of the machining error correcting apparatus for a machine tool according to the present invention includes a first sensor unit 510 and a second sensor unit 520 .

Both the first sensor unit 510 and the second sensor unit 520 are formed as gyro acceleration sensors.

The first sensor unit 510 is installed in the column to detect a change in position and an angle of the column due to deflection of the bed according to the real-time movement of the column. Preferably, the first sensor unit is installed at the lower part of the column, which is a transport system of the column.

The second sensor unit 520 is installed on a support such as a sub-spindle or tailstock, and through real-time movement of the support, such as a sub-spindle or tailstock, a position change and angle of the support according to the lifting of the workpiece by a thrust acting on the workpiece. sense the change Preferably, the second sensor part is installed in a part of the housing part which clamps the work piece of the sub-spindle or tailstock.

Accordingly, the phase error due to the deflection of the bed is derived through a position error through the acceleration sensor unit of the gyro acceleration sensor of the first sensor unit and an angle error through the gyro sensor unit of the gyro acceleration sensor.

In addition, the phase error due to the lifting of the workpiece is derived through correction according to the position error through the acceleration sensor unit of the gyro acceleration sensor of the second sensor unit, angular error through the gyro sensor unit of the gyro acceleration sensor, and tool coordinates.

The detailed derivation process of deriving the phase change of the first sensor unit of the column due to the deflection of the bed according to the movement of the column and deriving the phase change of the second sensor unit of the support unit due to the lifting of the workpiece due to the movement of the support such as the sub spindle or tailstock and the method will be described later.

1 to 3, the control unit 600 of the machining error correction apparatus of the machine tool according to the present invention is a memory unit 610, a calculation unit 620, a correction unit 630, and / or a selection unit (640).

In addition, although not shown in the drawings, the control unit of the machining error correction device of the machine tool according to the present invention includes a PLC.

The control unit includes NC (numerical control, NC) or CNC (computerized numerical control), and various numerical control programs are built-in. That is, the control unit includes a column, a main spindle, a machining unit, a support unit such as a sub spindle or tailstock, a tool changing device, and a driving program such as a magazine, and the program is automatically loaded and operated according to the driving of the control unit. In addition, the control unit communicates with the column, the main spindle, the support unit, the PLC, the sensing unit, and the processing unit by a predetermined protocol.

In addition, although not shown in the drawings, according to a preferred embodiment of the present invention, the control unit includes a main operation unit, and the main operation unit includes a screen display program and a data input program according to screen display selection, and a screen display program Displays the software switch on the display screen according to the output of the software switch, recognizes the ON/OFF of the software switch, and executes the function of issuing input/output commands for machine operation.

In addition, although not necessarily limited thereto, the main operation unit includes a monitor that is installed on the housing, case, or one side of the machine tool to display various function switches or buttons and various information.

A programmable logic controller (PLC) performs communication according to a predetermined protocol with a control unit, a column, a processing unit, a main spindle, a support unit, a PLC, a sensing unit, and the like, and performs a function of executing a control command through such communication. That is, the PLC drives the main spindle, the support part, the column, the machining part, the magazine, the tool changer, etc. according to the numerical control program of the controller.

Although not shown in the drawings, the machining error correction device control unit of the machine tool according to the present invention may include a display unit.

The display unit may improve user convenience by displaying the results of the memory unit, the confirmation unit, the comparison unit, the determination unit, the phase error calculation unit, the correction value calculation unit, and the processing unit in real time and the selection result of the selection unit to be described later. Such a display unit is a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), a flexible display (flexible display), It may include at least one of a three-dimensional display (3D display) and an electronic ink display (e-ink display).

In addition, although not necessarily limited thereto, the display unit is formed in the form of a touch screen and installed on the housing, case, or one side of the machine tool to display various function switches or buttons and various information.

The selection unit 640 selects whether to correct the processing error according to the phase change of the column and the support. That is, it can be determined through the on/off function through a simple button operation according to the user's will as to whether or not to correct the machining error according to the phase change of the column and the support part during the machining of the workpiece of the selector machine tool. Specifically, the selection unit is displayed in the form of a button on the display unit or the operation panel of the control unit, and when the user turns on the automatic correction function for processing errors according to the phase change of the column and the support unit through the button operation, the column and sub spindle or the support unit such as the tailstock The gyro acceleration sensor is used to derive the phase error caused by the deflection of the bed due to the weight generated in conjunction with the phase change through movement and the lifting of the workpiece by the thrust of the sub spindle or tailstock in real time and automatically calculates it. It automatically corrects the machining error of the workpiece in real time by automatically calculating the phase error value and compensation value accurately and quickly. On the other hand, if the user turns off the automatic execution function of processing error due to the phase change of the column and support part through button operation, the automatic execution function of the processing error correction according to the phase change of the column and support part is not activated and processing without correction of processing error carry out In this way, as the user arbitrarily selects whether to correct the machining error of the machine tool as needed, the machining time is reduced to maximize the productivity, and the machining precision can be further improved as needed, so it is optimized according to the characteristics of the type and material being machined. It is possible to maximize customer satisfaction and promote operator convenience by performing the processed processing.

The memory unit 610 stores data for correcting a processing error according to a phase change of the column and the support unit. The memory unit 610 may be various storage devices such as ROM, RAM, EPROM, flash drive, hard drive, etc., and may be a web storage that performs a storage function of the memory unit 610 on the Internet. may be

The calculator 620 calculates a phase error due to the deflection of the bed and the lifting of the workpiece, which are generated in association with the movement of the column and the support, through the data sensed by the sensing unit and the data stored in the memory unit.

The compensating unit 630 calculates a correction value based on the phase error value calculated by the calculator and the data stored in the memory unit, and according to the correction value, the deflection of the bed and the lifting of the workpiece are generated in association with the movement of the column and the support unit. Real-time correction of machining errors by

Therefore, the machining error correction device of the machine tool according to the present invention automatically interworks with the transfer of the support such as the column and the sub spindle or the tailstock to automatically detect the machining error according to the phase change due to the deflection of the bed or the lifting of the work piece in real time. This system improves the safety and reliability of the machine tool by quickly and accurately calibrating the machine tool, and it does not require a separate test processing to promote operator convenience and prevent safety accidents in advance.

As shown in FIG. 3 , the memory unit 610 of the control unit of the machine tool machining error correction apparatus according to the present invention includes a basic data storage unit 611 , a coordinate data storage unit 612 , and a sensing data storage unit 613 . , and a real-time data storage unit 614 .

The basic data storage unit 611 stores data on the workpiece data, the tool data, the theoretical data of the phase error, the correction coefficients of the first sensor unit and the second sensor unit, the measurement program, and the processing program. That is, the basic data storage unit stores the data on the type and size of the workpiece, the data on the type of the length of the tool, the theoretical data of the position error for calculating the correction coefficient, the measurement program for the pre-calculation of the correction coefficient, and the machining program.

The coordinate data storage unit 612 stores coordinate data for the current position of the tool detachably mounted on the column, the support, and the processing unit.

The sensing data storage unit 613 stores real-time phase data of the column and the support unit according to the sensing of the first sensor unit and the second sensor unit.

The real-time data storage unit 614 stores data on the phase error value calculated in real time by the calculator and the correction value calculated in real time by the correction unit in real time. That is, the real-time data storage unit stores the phase error value calculated by the phase error calculator to be described later and the correction value calculated by the correction value calculator in real time.

As shown in Figure 3, the calculation unit 620 of the control unit of the machining error correction apparatus of the machine tool according to the present invention is a confirmation unit 621, a comparison unit 622, a determination unit 623, and a phase error calculation unit (624).

The check unit 621 checks whether the column and the support are moved, and when the column and the support are moved, a sensing unit senses a phase change according to the real-time movement of the column and the support. That is, the check unit checks whether the column and the support unit move, and when the column and the support unit move, the first sensor unit senses a phase change of the column and transmits it to the sensing data storage unit, and the second sensor unit sends the sub-spindle or the shim. The phase change of the support part, such as a mandrel, is sensed and transmitted to the sensing data storage unit.

The comparison unit 622 compares the current coordinate data of the column and the support unit stored in the coordinate data storage unit and the column and support unit phase data stored in the sensing data storage unit when the column or the support unit is moved as a result of the confirmation unit.

The determination unit 623 determines whether a phase error occurs between the column and the support unit according to the comparison result of the comparison unit.

The phase error calculation unit 624 calculates the phase error of the column as a horizontal phase error value and a vertical phase error value due to deflection of the bed when a phase error of the column and the support part occurs according to the determination result of the determination unit, and the support unit The phase error is automatically calculated as the horizontal phase error value and the vertical direction phase error value due to the lifting of the workpiece. A detailed calculation method and principle will be described later.

As shown in FIG. 3 , the correction unit 630 of the control unit of the processing error correction apparatus for a machine tool according to the present invention includes a correction value calculation unit 631 and a processing unit 632 .

The correction value calculation unit 631 automatically calculates a correction value of the processing error in real time through the phase error calculation value of the phase error calculation unit, the data stored in the real-time data storage unit, and the correction coefficient stored in the basic data storage unit. The reason for calculating the correction value through the correction coefficient in the correction value calculation unit is as shown in FIG. 2 , the first sensor unit and the second sensor unit of the sensing unit of the machining error correcting device of the machine tool according to the present invention, respectively. This is because the theoretical compensation value and the difference occur as the system and the sub spindle or tailstock are installed in the housing of the supporting part.

The processing unit 632 performs processing error correction according to the correction value of the correction value calculation unit.

A machining error correction principle of a machine tool will be described with reference to FIGS. 1 to 6 .

As shown in Figure 1, the bed of the machine tool is deflection of the bed due to the weight that occurs in conjunction with the phase change through the movement of structures such as the column 200 and the sub-spindle or the support 400 such as the tailstock (Fig. 1), a machining error inevitably occurs during machining of the workpiece 2 with the tool 220 mounted on the machining unit 210 . In addition, as the support part 400 such as the sub spindle or the tailstock moves and supports the workpiece in the pressing direction, lifting of the workpiece by the thrust of the support part (arrow B in FIG. 1 ) occurs and is mounted on the processing part 210 . A machining error inevitably occurs when machining the workpiece 2 with the tool 220 .

1 and 2, the first sensor unit 510 and the second sensor unit 520 of the sensing unit 500 of the machining error correcting device for a machine tool according to the present invention are respectively a column transport system and As it is installed in the housing of a support such as a sub-spindle or tailstock, the theoretical compensation value and difference occur. That is, as shown in FIG. 2 , if the actual correction coefficient due to the actual measurement positions of the first sensor unit and the second sensor unit and the distance between the tool and the work piece is not reflected, the structure of the support part such as the column and the sub spindle or the tailstock is damaged. It is impossible to accurately and quickly reflect the phase error caused by the deflection of the bed due to the weight that occurs in conjunction with the phase change through movement and the lifting of the workpiece by the thrust of the sub spindle or tailstock. Specifically, the correction coefficient (K) for the error due to the deflection of the bed may be linearly different from the phase error (K1, K2) due to the measurement position and the position of the motor of the feed system and the structural dynamics/rigidity. It is calculated as a constant through the measurement program and phase error theoretical data and difference for each machine tool. In addition, the correction coefficient (Q) for the error caused by the lifting of the workpiece may be linearly different due to the phase error depending on the measurement position and the length of the quill of the tailstock or the chuck of the sub spindle and the center of the tailstock or the sub spindle. For each machine tool, it is calculated as a constant through the measurement program and the theoretical data and difference of the phase error. Therefore, it is essential to calculate the correction factor for each machine tool.

In this way, the correction coefficient for each machine tool must be calculated in advance by comparing it with the phase error theoretical data and stored in the basic data storage unit, so that the correct correction value calculation is performed later in the correction value calculation unit, and the precise and accurate processing error Calibration can be performed.

As shown in FIG. 4 , the phase error of the column due to the deflection of the bed due to the weight generated in conjunction with the movement of the column is the position error (C) of the gyro acceleration sensor of the first sensor unit and the position error (C) of the gyro acceleration sensor. It is derived through the angular error D through the gyro sensor unit. As such, in order to compensate for a phase error consisting of a position error and an angle error, horizontal correction and vertical transformation are necessarily required.

That is, as shown in FIG. 4 , the vertical phase error (C _v1 ) and the horizontal phase error (C _h1 ) of the column due to the deflection of the bed are calculated by Equation 1.

[Equation 1]

Vertical phase error (C _v1 ) = l ₁

Horizontal phase error (C _h1 ) = sinθ ₁

Accordingly, when the phase error of the column occurs in the phase error calculator, the horizontal phase error value and the vertical phase error value due to the deflection of the bed are calculated as the column phase error by Equation 1.

As shown in FIGS. 5 and 6, the phase error of the support part due to the lifting of the workpiece generated in association with the movement of the support part such as the sub spindle or the tailstock is the position error ( It is derived through correction according to E) and the angular error (F) and the tool coordinate (G) through the gyro sensor part of the gyro acceleration sensor. Specifically, for the phase error for the lifting of the workpiece due to the movement of the support part, horizontal and vertical correction are necessarily required to compensate for the phase error consisting of position error and angle error, and at the same time, the point at which the tool coordinates act and the actual sensing Depending on the difference in parts, it is required to convert the workpiece lifting angle caused by the position error, the vertical position error, and the tool coordinate error (G) caused by the position error.

That is, as shown in FIG. 5 , the workpiece lifting angle θ ₂ generated by the position error of the support part due to the workpiece lifting is calculated by Equation 2 .

[Equation 2]

θ ₂ = tan ^-1 (l ₂ /tool coordinate)

In addition, as shown in FIGS. 5 and 6 , the vertical phase error (C _v2 ) and the horizontal phase error (C _h2 ) due to lifting of the workpiece are calculated by Equation 3 .

That is, as shown in FIG. 6 , the horizontal phase error (C _h2 ) is calculated according to the angle error (F) through the gyro sensor unit and the phase error (J) according to the tool coordinates.

[Equation 3]

Vertical phase error (C _v2 ) = tool coordinate * tanθ ₂

Horizontal phase error (C _h2 ) = C _v2 * tanθ ₂ = tool coordinate * (tanθ ₂ ) ²

Accordingly, when a phase error of a support such as a sub spindle or tailstock occurs in the phase error calculator, the phase error of the support is calculated by Equation 3 as a horizontal phase error value and a vertical phase error value due to lifting of the workpiece.

As described above, in order to accurately correct the processing error caused by the lifting of the work and the deflection of the bed due to the phase change due to the movement of the column or the support, the correction coefficient is based on the phase error value due to the deflection of the bed and the lifting of the work. The correction value should be calculated by reflecting

As the phase error calculator calculates the phase error due to the deflection of the bed by Equation 1, and calculates the phase error due to the lifting of the workpiece by Equation 3, the correction value calculator calculates the theoretical value of the correction value primarily by Equation 4. .

[Equation 4]

Vertical Theoretical Correction Value = C _v1 + C _v2 = l _{1 +} tool coordinate * tanθ ₂

Horizontal direction theoretical correction value = C _h1 + C _h2 = sinθ ₁ + Tool coordinates * (tanθ ₂ ) ²

Thereafter, the correction value calculator calculates the final correction value by reflecting the correction coefficient through Equation 5.

[Equation 5]

Vertical correction value (C _V ) = K ₁ * C _v1 + C _v2 = l _{1 +} tool coordinate * tanθ ₂ + Q

Horizontal correction value (C _H ) = C _h1 + C _h2 = K ₂ * sinθ ₁ + Tool coordinates * (tanθ ₂ ) ²

Thereafter, the processing unit performs processing by correcting the processing error with the vertical correction value and the horizontal correction value finally calculated secondly through the correction value calculation unit.

Accordingly, the apparatus for correcting machining error of a machine tool according to the present invention responds to the deflection of the bed due to the weight and the thrust of the sub spindle or tailstock, which is generated in conjunction with the phase change through movement of the column and the support such as the sub spindle or tailstock. The phase error caused by the lifting of the workpiece by the By compensating, the processing precision of the machine tool is improved, the occurrence of defective products is minimized to prevent wastage of resources, and the deflection of the bed that occurs in conjunction with the transfer of the structure or the lifting of the workpiece by the thrust of the support such as the sub spindle or tailstock is prevented. By automatically calculating and promptly compensating for phase changes caused by test machining, it maximizes productivity by reducing non-working time, reduces maintenance costs, improves machine tool safety and reliability, and requires separate test machining. Therefore, it is possible to promote the convenience of workers and prevent safety accidents in advance.

A method of correcting a machining error of a machine tool according to the present invention will be described with reference to FIG. 7 . As shown in Figure 7, the machining error correction method of the machine tool according to the present invention is a correction coefficient calculation step (S1), data storage step (S2), selection step (S3), confirmation step (S4), sensing step (S5) ), a comparison step (S6), a determination step (S7), a phase error calculation step (S8), a correction value calculation step (S9), and a correction step (S10). In each step, the operation process, operating principle, configuration, and content of the device are the same as the machining error compensation device of the machine tool of the specification of the present invention. explained as

In order to correct the processing error due to the phase change of the column and the support, the correction coefficient is calculated based on the theoretical data and the measured data of the phase error. As described above, since the theoretical value and the actual measurement part of the sensing part are different, the phase error calculated by the phase error calculation part must be corrected through the correction coefficient to perform accurate correction, thereby improving processing precision, reliability, and stability.

Data for correcting processing errors due to phase changes of columns and supports are stored. That is, necessary data is stored in the memory unit.

After the data storage step (S2), it is selected whether to activate the processing error correction function according to the phase change of the column and the support. That is, as described above, through the on/off button, the user can arbitrarily select whether to activate the correction function during machining of the machine tool and perform the correction or proceed without correction. can be promoted

If the machining error correction function is selected after the selection step (S3), it is checked whether the column and the support are moved in real time. That is, the confirmation unit checks whether the column and the support are moved in real time, and when the movement occurs, the phase change is sensed in real time through the sensing unit.

After the confirmation step (S4), when real-time movement of the column and the support occurs as a result of confirmation, the phase change of the column and the support is sensed through the sensing unit. That is, the phase error due to the deflection of the bed is derived through a position error through the acceleration sensor unit of the gyro acceleration sensor of the first sensor unit and an angle error through the gyro sensor unit of the gyro acceleration sensor.

After the sensing step (S5), the comparison unit compares the current coordinate data of the column and the support and the phase data of the column and the support through sensing.

After the comparison step (S6), the determination unit determines whether a phase error occurs between the column and the support unit according to the comparison result of the comparison unit.

After the determination step (S7), when the phase error of the column and the support part occurs as a result of the determination of the determination unit, the phase error of the column and the support unit is calculated by the phase error calculation unit. The phase error is automatically calculated through Equation 3.

After the phase error calculation step (S8), the phase error calculation unit reflects the calculated phase error value calculated through Equations 1 and 3, the correction coefficient stored in the basic data storage unit, and the data previously stored in the real-time data storage unit to correct it To calculate the correction value of the machining error in the value calculator, first calculate the theoretical value using Equation 4. After that, the actual correction value is automatically calculated secondarily through Equation 5 by reflecting the correction factor.

After the compensation value calculation step (S9), the processing error due to the deflection of the bed and the lifting of the workpiece generated in conjunction with the movement of the column and the support part by the compensation value of the calculated processing error is corrected in real time through the processing unit.

Therefore, in the method for correcting machining error of a machine tool according to the present invention, the deflection of the bed due to weight and the thrust of the sub spindle or tailstock are generated in conjunction with the phase change through movement of the column and the support such as the sub spindle or tailstock. The phase error caused by the lifting of the workpiece is derived in real time using the gyro acceleration sensor, and the phase error value and compensation value are calculated automatically and precisely and quickly to automatically compensate the machining error of the workpiece in real time. As a result, the machining precision of the machine tool is improved, and the occurrence of defective products is minimized to prevent wastage of resources, and by automatically calculating and quickly compensating without test machining, the productivity is maximized by reducing the non-machining time, and the maintenance cost is reduced. In addition, the safety and reliability of the machine tool are improved, and there is no need for separate test processing, so it is possible to promote operator convenience and prevent safety accidents in advance.

In the detailed description of the present invention described above, although it has been described with reference to preferred embodiments of the present invention, those skilled in the art or those having ordinary skill in the art will It will be understood that various modifications and variations of the present invention can be made without departing from the spirit and scope of the present invention. Accordingly, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

1: machine tool, 2: work piece
100: bed 200: column
210: processing unit, 220: tool
300: main spindle 400: support
500: sensing unit, 510: first sensor unit
520: second sensor unit, 600: control unit
610: memory unit 620: calculation unit
630: correction unit 640: selection unit.

Claims (12)

bed;
a main spindle installed on the bed to clamp the workpiece to process the workpiece;
a support part which is horizontally movably installed on the bed while facing the main spindle in a horizontal direction to support or clamp the workpiece;
a column on which a tool is mounted and provided with a processing unit for processing the workpiece and is horizontally movably installed on the bed;
a sensing unit configured to sense a real-time phase change of the column and the support unit according to movement of the column and the support unit; and
A control unit for correcting a processing error according to a phase change of the column and the support unit sensed by the sensing unit;
The control unit is a machining error correction device for a machine tool, characterized in that for correcting in real time a machining error caused by the lifting of the work and the deflection of the bed that occurs in conjunction with the movement of the column and the support.
According to claim 1,
The sensing unit,
a first sensor unit installed in the column to detect a change in position and angle of the column due to deflection of the bed according to real-time movement of the column; and
A second sensor unit that is installed on the support and senses a change in position and an angle of the support according to the lifting of the work by a thrust acting on the work through real-time movement of the support; Machining error compensation device.
3. The method of claim 2,
The control unit is
a memory unit for storing data for correcting a processing error according to a phase change of the column and the support unit;
a calculation unit for calculating a phase error due to deflection of the bed and lifting of the workpiece generated in association with movement of the column and the support unit through the data sensed by the sensing unit and the data stored in the memory unit; and
The phase error value calculated by the calculator and the data stored in the memory unit calculate a correction value, and according to the correction value, the deflection of the bed and the work piece occurring in conjunction with the movement of the column and the support unit. Machining error correction device for a machine tool comprising a; a correction unit for performing real-time correction of the machining error due to lifting. 4. The method of claim 3,
The memory unit,
a basic data storage unit for storing workpiece data, tool data, theoretical data of phase error, correction coefficients of the first sensor unit and the second sensor unit, a measurement program, and data on a machining program;
a coordinate data storage unit for storing coordinate data for the column, the support unit, and the current position of the tool;
a sensing data storage unit configured to store real-time phase data of the column and the support unit according to the sensing of the first sensor unit and the second sensor unit; and
and a real-time data storage unit for storing in real time data on the phase error value calculated in real time by the calculator and the correction value calculated in real time by the correction unit.
5. The method of claim 4,
The calculation unit,
a confirmation unit that checks whether the column and the support part move, and senses a phase change according to the real-time movement of the column and the support part with the sensing part when the column and the support part move;
Comparing the current coordinate data of the column and the support unit stored in the coordinate data storage unit and the phase data of the column and the support unit stored in the sensing data storage unit when the column or the support unit is moved as a result of the confirmation unit comparison department;
a determination unit for determining whether a phase error occurs between the column and the support unit according to the comparison result of the comparison unit; and
When the phase error of the column and the support part occurs according to the determination result of the determination unit, the phase error of the column is calculated as a horizontal phase error value and a vertical phase error value due to deflection of the bed, and the phase of the support part and a phase error calculation unit for calculating the error as a horizontal phase error value and a vertical phase error value due to lifting of the workpiece.
6. The method of claim 5,
The correction unit,
a correction value calculation unit for calculating a correction value of the processing error based on the phase error calculation value of the phase error calculation unit, the data stored in the real-time data storage unit, and the correction coefficient stored in the basic data storage unit; and
Processing error correction apparatus for a machine tool comprising a; a processing unit for performing processing error correction according to the correction value of the correction value calculation unit. 4. The method of claim 3,
The control unit is
Machining error correction apparatus for a machine tool, characterized in that it further comprises; a selection unit for selecting whether to correct the processing error according to the phase change of the column and the support.
3. The method of claim 2,
The support part is a machining error correction device for a machine tool, characterized in that formed of a sub-spindle or tailstock.
3. The method of claim 2,
Both the first sensor unit and the second sensor unit are formed of a gyro acceleration sensor,
The phase error due to the deflection of the bed is derived through the position error through the acceleration sensor of the first sensor unit and the angle error through the gyro sensor,
The phase error due to the lifting of the work piece is a machining error correction device for a machine tool, characterized in that it is derived through correction according to the position error through the acceleration sensor of the second sensor unit, the angle error through the gyro sensor, and the tool coordinates. storing data for correcting a processing error according to a phase change of the column and the support;
checking whether the column and the support part move in real time;
sensing a phase change of the column and the support part when the real-time movement of the column and the support part occurs as a result of the check;
comparing the current coordinate data of the column and the support part with the phase data of the column and the support part through sensing;
determining whether a phase error occurs in the column and the support unit according to the comparison result;
calculating a phase error of the column and the support part when the phase error of the column and the support part occurs as a result of the determination;
calculating a correction value of the processing error based on the phase error calculated value and pre-stored data; and
Compensating in real time the processing error caused by the deflection of the bed and the lifting of the workpiece generated in conjunction with the movement of the column and the support part by the calculated correction value of the processing error; of processing error correction method.
11. The method of claim 10,
After the step of storing the data,
Selecting whether to activate the machining error correction function according to the phase change of the column and the support part; Machining error correction method of the machine tool further comprising a.
11. The method of claim 10,
Before the step of storing the data,
Calculating a correction coefficient through theoretical data and measurement data of the phase error in order to correct the processing error according to the phase change of the column and the support part;

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