KR102428567B1 - Offset detector for detecting installation offset of attachments - Google Patents

Abstract

Disclosed is an installation error detecting device for automatically detecting an installation error in a central position of an attachment spindle. The installation error detection device is fixed to a single detection position on the table upper surface of the processing machine and has a body having a coupling shaft protruding from the surface, a fixed frame rotatably disposed about the coupling shaft of the body, and a ball shape and coupled to the machine and an error detector having a contact hole in contact with the test tool of the head attachment being used, and a displacement detecting rod in contact with the contact hole and movably coupled to the fixed frame and movable in proportion to the displacement of the contact hole. The installation error with respect to the spindle center position of the head attachment is individually detected along the unit axis direction at a single detection position on the table.

Description

Attachment installation error detection device {OFFSET DETECTOR FOR DETECTING INSTALLATION OFFSET OF ATTACHMENTS}

The present invention relates to an attachment installation error detection apparatus, and more particularly, to a machine tool head attachment installation error detection apparatus for detecting an installation error with respect to a spindle center position of a head attachment for a machine tool.

As the demand for large workpieces having complex shapes increases, a 5-sided machining machine in which a large workpiece is fixed on a table and a ram unit processes five surfaces of the workpiece into various shapes is widely used.

A typical 5-sided machining center, such as a door-shaped machining center, is equipped with not only a tool set for machining various shapes, but also various head attachments for easily coupling the necessary tools required for shape machining to the ram spindle of the machining center. . At this time, the spindle center position of each of the head attachments and the surface position of the object to be processed are displayed using the same coordinate system to prevent coordinate confusion between the spindle center position of the head attachments and the machining position of the workpiece. For example, a three-dimensional spatial coordinate system is set to display the working space, which is the upper area of the table where machining of the workpiece is performed, and the surface position of the workpiece and the driving center position of the tool processing the workpiece are displayed using the same coordinate system. have.

An appropriate tool and head attachment are selected according to the type of processing and are coupled to the ram spindle of the processing machine, and the spindle center position of the head attachment obtained using the shape data, which is the numerical data of the design stage of the head attachment, is set as the origin of the coordinate system or a specific operation Position it at the reference point (hereinafter, the working coordinates). The numerical control program of the machining machine identifies the machining position of the workpiece based on the work coordinates, and the work tool is located at the work coordinate, so that the work is processed at the correct position.

However, since the head attachments contain various installation errors such as machining errors occurring in the machining step and coupling errors occurring in the process of being coupled to the ram spindle, the spindle center position of the head attachment calculated based on the design shape data When the ram unit is moved based on , the position of the tool is deviated from the work coordinate by an installation error. That is, the tool is located at the coordinates that are deviated from the working coordinates by the installation error, but the machining position is identified based on the working coordinates, so the machining is performed on the workpiece at the position deviated by the installation error, thereby causing cutting defects.

In order to prevent defective cutting due to the installation error as described above, an installation error detection operation is performed in advance to individually check the installation error for each head attachment required for the machining before the operation of the machine tool.

The conventional attachment installation error detection device is composed of a dial gauge that contacts a contact hole supported by a single shaft and a test tool, and measures the installation error by the amount of movement of the contact hole.

However, in a three-dimensional space, since the installation error must be measured as three independent components along three axis directions, the conventional installation error detection device independently detects the error components along the three axis directions at three different points on the table. There is the inconvenience of having to measure. Accordingly, there is a problem in that the operation of installing and disassembling the installation error detection device at three different points on the table must be repeated. In particular, in the case of angle attachments or universal attachments, error components in the 3-axis direction must be individually detected according to the angle with the ram spindle, so the time required for installation and disassembly of the installation error detection device increases exponentially. There is a problem.

In addition, since the error measured by the conventional installation error detection device is an error centered on the position of the test tool, in order to reflect the error regarding the spindle center position of the attachment, the shape characteristic of the test tool is reflected from the measured value. There is the inconvenience of having to recalculate due to the error regarding the spindle center position.

An object of the present invention is to provide an attachment installation error detection device that can increase the speed and precision of the attachment installation error detection by directly detecting the attachment installation error at a single point on the table as proposed to solve the above-described problem. will do

In order to achieve the object of the present invention described above, the attachment installation error detection device according to exemplary embodiments of the present invention is fixed to a single detection position on the table top surface of the processing machine and has a body having a coupling shaft protruding from the surface, the A fixed frame that is rotatably disposed about the coupling axis of the body, and a contact hole in contact with the test tool of the head attachment coupled to the processing machine and having a ball shape, and the contact hole is fixed to the contact hole and is movably coupled to the fixed frame An error detector for individually detecting an installation error with respect to the spindle center position of the head attachment along a unit axis direction of a spatial coordinate system representing the working space of the processing machine by having a displacement detecting rod movable in proportion to the displacement of the contact hole do.

In one embodiment, the displacement detecting rod is disposed parallel to the upper surface of the table, the horizontal displacement detecting rod is moved in proportion to the horizontal component of the displacement of the contact ball, and disposed perpendicular to the upper surface of the table to the displacement of the contact ball and a vertical displacement detection rod that moves in proportion to the vertical component of

In one embodiment, the fixing frame includes a coupling member coupled to the coupling shaft, a coupling member fixed to the coupling member, and a horizontal member coupled to the coupling member parallel to the table, wherein the horizontal displacement detecting rod includes: The vertical displacement detecting rod passes through the connecting member and is disposed in parallel with the horizontal member, and the vertical displacement detecting rod passes through the horizontal member and is disposed in parallel with the connecting member.

In an embodiment, the error detector is connected to the horizontal displacement detection rod and disposed adjacent to the side surface of the coupling member to detect a horizontal installation error that is a horizontal component of the installation error from a moving distance of the horizontal displacement detection rod. and a detector, and a vertical detector connected to the vertical displacement detection rod and disposed under the horizontal member to detect a vertical installation error, which is a vertical component of the installation error, from a moving distance of the horizontal displacement detection rod.

As an embodiment, the horizontal installation error is detected along a first axial error detected along a first axial direction of the spatial coordinate system that is the width direction of the table and a second axial direction of the spatial coordinate system that is a longitudinal direction of the table and a second axial error, wherein the vertical installation error includes a third axial error detected along a third axis of the spatial coordinate system that is the height direction of the table, and the installation error includes the first to It can be specified by the third axis error.

In one embodiment, it further comprises an installation error transmission unit for converting the installation error detected by the error detector into digital data and transmitting it to the processing machine.

According to the attachment installation error detection device according to exemplary embodiments of the present invention, only two measurements at a single location on the table without moving the measurement point along each axis direction of the three-dimensional spatial coordinate system for the spindle center position of the attachment Installation errors can be detected. Accordingly, it is possible to significantly reduce the installation error detection time compared to the conventional detection device that calculates each axial installation error by individual measurement at three different measurement points. In particular, when an installation error needs to be detected for each arrangement angle of a ram unit and a test tool, such as an angle attachment or a universal attachment, the installation error detection time can be significantly reduced.

In addition, by converting the detected installation error into digital data and automatically transmitting it to the control console of the processing machine, it is possible to prevent the error of the installation error input compared to the conventional method of individually inputting the measured installation error. Accordingly, it is possible to remarkably increase the correction accuracy for the spindle center position of the head attachment. In particular, when an automatic attachment changer capable of automatically exchanging attachments is provided in the processing machine, the adjustment of the attachment center position using the attachment exchange and installation error input and installation error is automatically performed by the numerical control program, thereby improving the processing speed of the processing machine. Work efficiency can be significantly improved.

1 is a perspective view showing an attachment installation error detection device for automatically measuring the central position installation error of the attachment spindle according to an embodiment of the present invention.
Figure 2 is an exploded perspective view showing the attachment installation error detection device shown in Figure 1 in accordance with an embodiment of the present invention.
Figure 3 is a view showing in detail the assembly of the fixed frame and the error detector of the attachment installation error detection device shown in Figure 1 according to an embodiment of the present invention.
4A is a diagram conceptually illustrating an arrangement of an error detector for detecting a first axial error and a third axial error.
4B is a diagram conceptually illustrating an arrangement of an error detector for detecting a second-axis error and a third-axis error.

With respect to the embodiments of the present invention disclosed in the text, specific structural or functional descriptions are only exemplified for the purpose of describing the embodiments of the present invention, and the embodiments of the present invention may be embodied in various forms. It should not be construed as being limited to the embodiments described in .

Since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms may be used for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle. Other expressions describing the relationship between elements, such as "between" and "immediately between" or "neighboring to" and "directly adjacent to", etc., should be interpreted similarly.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate that the described feature, number, step, operation, component, part, or combination thereof exists, and is intended to indicate that one or more other features or numbers are present. , it is to be understood that it does not preclude the possibility of the presence or addition of steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with the context of the related art, and unless explicitly defined in the present application, they are not to be interpreted in an ideal or excessively formal meaning. .

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

1 is a perspective view showing an attachment installation error detection device for automatically measuring the central position installation error of the attachment spindle according to an embodiment of the present invention. Figure 2 is an exploded perspective view showing the disassembled body of the attachment installation error detection device shown in Figure 1 according to an embodiment of the present invention. Figure 3 is a view showing in detail the assembly of the fixed frame and the deviation detection unit of the attachment installation error detection device shown in Figure 1 according to an embodiment of the present invention.

1 to 3, the attachment installation error detecting device 500 according to an embodiment of the present invention is fixed to a single detection position on the upper surface of the table (not shown) of the processing machine (not shown) and protruding from the surface. A body 100 having a coupling shaft 142, a fixed frame 200 rotatably disposed about the coupling shaft 142 of the body 100, and a head attachment having a ball shape and coupled to the processing machine a contact hole 320 in contact with the test tool of 310) and an error detector 300 for individually detecting an installation error with respect to the spindle center position of the head attachment along a unit axis direction of a spatial coordinate system representing the working space of the processing machine.

As an embodiment, the body 100 functions as a base on which the fixed frame 200 and the error detector 300 are mounted, and is fixed to the upper surface of the table on which the workpiece to be processed is fixed, so that the attachment installation error detection device 500 ) is fixed to the processing machine.

The processing machine (not shown) is provided with a bed and a table movable along the longitudinal direction of the bed, such as a door-shaped machining center, and a 5-sided processing machine capable of processing 5 sides of a three-dimensional workpiece while fixing the workpiece to be processed on the table. include Accordingly, the workpiece fixed on the table is machined in a three-dimensional working space set in the longitudinal and width directions of the table and the height direction of the table. Accordingly, the machining position of the workpiece fixed to the table upper surface in the work space is uniquely designated by the three-dimensional spatial coordinate system representing the work space.

An appropriate tool corresponding to the ram spindle of the machining machine is coupled according to the type of machining of the work piece and is controlled by a numerical control program of the machine tool, so that predetermined machining is performed at the machining position of the work piece. At this time, the numerical control program specifies a machining position using the three-dimensional spatial coordinate system and controls the ram spindle so that machining is performed at the specified machining position.

The workpiece fixed to the table of the processing machine according to this embodiment includes a large workpiece having a three-dimensional shape and a relatively large load and size, and processing of various shapes is performed on five surfaces except for the bottom surface fixed to the table. do.

For example, the body 100 has a flat top surface and is a flat plate fixed in parallel with the table, a pedestal 120 coupled to the fixing plate 110 to adjust the height of the body 100 . ), a housing 130 coupled to the pedestal 120 and having a cylindrical inner space to accommodate a rotating body and rotatably coupled to the inside of the housing 130 and the coupling shaft 142 along the axial direction ) is provided with a rotating body 140 that protrudes.

The fixing plate 110 is provided as a rectangular plate and is fixed to the upper surface of the table by a fastening member 111 . At this time, the upper surface of the fixed plate 110 is processed flat, and the upper surface 110a of the fixed plate 110 coupled to the table is arranged parallel to the upper surface of the table. Accordingly, the pedestal 120 and the housing 130 fixed to the upper surface 110a may be fixed in parallel with the table. The pedestal 120 is fixed to the upper surface 110a of the fixing plate 110 to provide a form in which the housing 130 having a cylindrical shape can be stably fixed. For example, the pedestal 120 may include holders 121 disposed at intervals of 120° with respect to the center to accommodate the housing 130 . The lower portion of the housing 130 is stably fixed to the holder 121 . In addition, the pedestal 120 may be deformed into various structures according to the shape and structure of the housing 130 .

The housing 130 has a receiving space (S) of a certain size and includes a receiving pod or a receiving cylinder having a predetermined thickness, and the rotating body 140 is installed in the receiving space (S). Accept. Accordingly, the housing 130 has a housing upper surface 130a aligned in parallel with the upper surface 110a of the fixing plate 110 . The rotating body 140 is rotatably accommodated in the housing 130 and coupled so that the coupling shaft 142 protrudes from the upper surface.

For example, the rotating body 140 is provided in the shape of a rod that fills the receiving space of the housing 130 and the coupling shaft 142 protruding from the upper surface along the central axis of the rod is disposed. The lower portion of the rotating body 140 is disposed on the coupling surface 140a in contact with the housing upper surface 130a, has a step difference from the coupling surface 140a, and extends downward to the receiving space of the housing 130. A portion 141 is provided. An aligner 141a is provided at an end of the extension 141 and is inserted into the central hole H disposed in the center of the pedestal 120 . Accordingly, the pedestal 120, the housing 130, and the rotating body 140 are automatically coupled to have the same central axis.

A rotatable coupling member (not shown) may be provided on the coupling surface 140a of the housing upper surface 130a and the rotating body 140 . For example, a defect groove (not shown) may be disposed on the upper surface of the housing 130a, and a roller-shaped coupling protrusion corresponding to the coupling groove may be disposed on the coupling surface 140a of the rotating body 140 . The coupling protrusion is inserted into the coupling groove and rotates at a constant rotation angle with respect to the central axis of the housing 130 .

In particular, by disposing a locking jaw (not shown) so that the rotating body 140 can be rotated in units of 90°, a displacement detecting rod described later is a spatial coordinate system representing the working space only by the manpower of the operator without using additional means. can be changed parallel to the axial direction of Accordingly, it is possible to easily measure the attachment installation error along each axial direction without changing the measurement location.

The coupling shaft 142 protrudes and extends upwardly of the rotating body 140 , and is disposed along the same direction as the central axes of the rotating body 140 and the housing 130 . Accordingly, when the rotating body 140 rotates inside the housing 130 , the coupling shaft 142 functions as a rotating shaft.

In this embodiment, the rotation body 140 starts to rotate with respect to the housing 130 , but the rotation body 140 and the housing 130 are provided integrally and the coupling shaft inside the rotation body 140 . It is obvious that 142 can be configured to rotate with respect to the rotating body 140 .

The fixed frame 200 is fixed to the coupling shaft 142 and rotates together about the coupling shaft 142 according to the rotation of the rotating body 140 , and the error detector fixed to the fixing frame 200 ( 300 is also rotated together with the rotating body 140 .

For example, the fixing frame 200 includes a coupling member 210 coupled to the coupling shaft 142, a coupling member 220 coupled to the coupling member 210, and the coupling member (220) parallel to the table. A horizontal member 230 coupled to 220 is provided.

In the present embodiment, the coupling member 210 is composed of a rectangular plate having an upper surface parallel to the upper surface of the rotating body 140 and is fixed to the coupling shaft 142 protruding from the upper surface of the rotating body 140 . At this time, the coupling member 210 may be rotatably coupled to the coupling shaft 142 or may be fixedly coupled. Accordingly, the coupling member 210 may rotate about the coupling shaft 142 or rotate within the rotating body 140 together with the coupling shaft 142 . In addition, when the coupling shaft 142 and the rotating body 140 are integrally fixed, the coupling member 210 is formed with respect to the housing 130 of the rotating body 140 centered on the coupling shaft 142 . can be rotated relatively.

The connection member 220 is fixed to the end of the rectangular coupling member 210, is disposed parallel to the coupling shaft 142, a rectangular flat plate extending along the third axial direction (III), the height direction of the working space is composed of Accordingly, the connecting member 220 is provided as a vertical member spaced apart from the coupling shaft 142 and extending vertically in parallel with the coupling shaft 142 .

The horizontal member 230 is coupled to the connection member 220 and is composed of a rectangular flat plate having an upper surface parallel to the upper surface of the table, and is disposed in parallel with the coupling member 210 . Accordingly, the horizontal member 230 and the coupling member 210 are spaced apart by a predetermined distance along a height direction parallel to the coupling shaft 142 and are fixed to the coupling member 220 in parallel with each other.

The error detector 300 is movably coupled to the fixed frame 200 to individually measure the displacement of the contact hole 320 along the unit axis direction of the spatial coordinate system to measure the spindle center position of the head attachment. Detect installation errors. The contactor 320 is in contact with a test tool (not shown) of a head attachment (not shown) coupled to the processing machine to induce displacement and measure the horizontal and vertical components of the displacement of the contactor, thereby attaching the attachment. It is possible to detect the installation error of the spindle center position.

In this embodiment, the error detector 300 has a ball shape and is in contact with the contact hole 320 and the contact hole 320 in contact with the test tool of the head attachment coupled to the processing machine, and is in contact with the fixed frame 200 . It is movably coupled and includes a displacement detection rod 310 that is movable in proportion to the displacement of the contact hole 320 .

The displacement detection rod 310 is disposed parallel to the upper surface of the table, and the horizontal displacement detection rod 311 moves in proportion to the horizontal component of the displacement of the contact hole, and the displacement detection rod 311 is disposed perpendicular to the upper surface of the table to displace the contact hole. and a vertical displacement detection rod 312 that moves in proportion to the vertical component of . The horizontal displacement detection rod 311 penetrates the connecting member 220 and is disposed in parallel with the horizontal member 230 , and the vertical displacement detection rod 312 penetrates the horizontal member 230 and the horizontal member 230 is disposed in the lower part.

Accordingly, the horizontal displacement detection rod 311 may move along the first axis I, which is the width direction of the table, or the second axis II, which is the longitudinal direction of the table, and the vertical displacement detection rod 312 may be moved along the vertical axis. may move along the third axis III, which is the height direction of the work space.

The horizontal displacement detection rod 311 is a connecting member 220 along the first axis (I) direction at a position spaced upward by a predetermined distance from the upper surface of the horizontal member 230 in the third axis (III) direction. is disposed to pass through, and the vertical displacement detecting rod 312 is spaced apart from the first side portion 221 of the connecting member 220 by a predetermined distance along the first axis (I) direction of the third axis. (III) is disposed to penetrate the horizontal member 230 along the direction. Accordingly, when the horizontal and vertical displacement detection rods 311 and 312 are extended, they intersect at one point, and the imaginary intersection is located on a plane defined by the first and third axes I and III. do.

The contact hole 320 is composed of a rigid ball disposed in a space defined by the horizontal member 230 and the connecting member 220 in contact with the horizontal and vertical displacement detecting rods 311 and 312 . In this case, the contact hole 320 is disposed so that the center coincides with the virtual intersection point. That is, the contact hole 320 is supported by contacting the side and lower portions so that the center of the contact hole 320 is located on the extension line of the horizontal and vertical displacement detection rods 311 and 312 .

Accordingly, when an external force is applied to the contact hole 320 , the displacement of the center of the contact hole 320 is a horizontal displacement that is a displacement along the first axis (I) or the second axis (II) and a third axis The displacement according to (III) is divided into vertical displacement, and the horizontal and vertical displacement detection rods 311 and 312 can move respectively in response to the horizontal displacement and the vertical displacement.

The horizontal and vertical displacements of the center of the contact hole 320 are respectively detected by the horizontal detector 340 and the vertical detector 350 .

The horizontal detector 340 is connected to the horizontal displacement detection rod 311 and is disposed adjacent to the side of the connection member 220, and is a horizontal component of the installation error from the moving distance of the horizontal displacement detection rod 311. Detect horizontal installation error. The vertical detector 350 is connected to the vertical displacement detection rod 312 and disposed below the horizontal member 230 to be installed vertically as a vertical component of the installation error from the moving distance of the vertical displacement detection rod 312 . Detect errors. In this case, the horizontal installation error and the vertical installation error may be respectively displayed as digital values on the first and second display units 341 and 351 .

In the present embodiment, the horizontal detector 340 is located adjacent to the second side 222 of the connecting member 220 symmetrical to the first side 221 and horizontal displacement passing through the connecting member 220 . It is coupled with the detection rod 311 . Accordingly, one end of the horizontal displacement detection rod 311 is in contact with the contact hole 320 and the other end is configured to be coupled to the horizontal detector 340 . The vertical detector 350 is positioned under the horizontal member 230 and is coupled to a vertical displacement detection rod 312 penetrating the horizontal member 230 . Accordingly, one end of the vertical displacement detecting rod 312 is in contact with the contact hole 320 and the other end is configured to be coupled to the vertical detector 350 .

At this time, the horizontal displacement detection rod 311 is attached to the horizontal detector 340 so that it can reciprocate with a constant amplitude along a horizontal plane parallel to the upper surface of the table based on a first equilibrium point (E1). The vertical displacement detection rod 312 is connected to the vertical detector 350 so that it can reciprocate with a constant amplitude along a vertical direction perpendicular to the upper surface of the table based on a second equilibrium point (E2). ) is connected to In addition, when the contact hole 320 and the test tool are released, the position of the horizontal displacement detection rod 311 is restored so that the first balance point E1 coincides with the zero point of the horizontal detector 340 , and , the position of the vertical displacement detection rod 312 is restored such that the second balance point E2 coincides with the zero point of the vertical detector 350 .

It is possible to adjust the zero point of the installation error detecting device 500 to the spindle center position of the reference attachment and measure the installation errors of various head attachments used in the processing machine. The central position of the reference attachment is set as a work position in a numerical control program that drives the machining machine.

The working coordinate functions as the origin of the coordinate system for the tool coupled to the head attachment to perform machining on the workpiece. That is, the work tool is located at the origin of the coordinate system and the machining position of the work piece is identified by the coordinate system having the work coordinate as the origin, so that the work piece can be precisely machined.

The attachment installation error detecting device 500 is fixed to the detection position on the table, and the test tool coupled to the reference attachment is brought into contact with the contact hole 320 to detect horizontal displacement disposed along the first axis (I) direction. The second balance point of the vertical displacement detection rod 312 arranged along the third axis (III) direction coincides with the zero point of the horizontal detector 340 to the position of the first balance point E1 of the rod 311 . The zero point of the vertical detector 350 is matched to the position of (E2). Next, the test tool and the contact hole 320 are separated, and the fixing frame 200 is rotated by 90° about the coupling shaft 142 along the second axis (II) direction perpendicular to the first axis. The horizontal displacement detection rod 311 is disposed. Zero point of the horizontal detector 340 at the position of the first balance point E1 of the horizontal displacement detection rod 311 disposed along the second axis (II) direction by bringing the test tool and the contact hole 320 into contact again. match the At this time, the position of the second balance point E2 of the vertical displacement detecting rod 312 is in a state in which the zero point adjustment is completed, and thus, additional zero point adjustment is unnecessary. The control console for driving the processing machine specifies the spindle center position of the reference attachment for which zero point adjustment has been completed, using the spatial coordinate system, and sets the specified coordinates as working coordinates.

When the setting of the working coordinates is completed, a specific head attachment in which the test tool is installed is coupled to the ram spindle, and the ram unit is driven to move to the working coordinates to bring the test tool and the contactor 320 into contact. The installation error is detected by measuring the horizontal and vertical displacements of the displacement detection rod measured by the contact.

4A is a diagram conceptually illustrating an arrangement of an error detector for detecting a first axial error that is a horizontal installation error along the first axial direction and a third axial error that is a horizontal installation error along the third axial direction. It is a diagram conceptually illustrating the arrangement of an error detector that detects a second axial error and a third axial error that are horizontal installation errors along two axial directions.

4A and 4B, the horizontal displacement detecting rod 311 is disposed along the first axis (I) direction and the vertical displacement detecting rod 312 is disposed along the third axis (III) direction. The attachment installation error detection device 500 is fixed to the detection position on the table.

When the test tool is coupled to a specific head attachment for which an installation error is to be detected and transferred to the work coordinates, a displacement of the center of the contact hole 320 is generated as much as the installation error due to the contact between the contact hole 320 and the test tool. When there is no installation error in the head attachment, since displacement of the center of the contact hole does not occur, correction of the center position of the attachment becomes unnecessary.

The horizontal displacement of the center of the contact hole results in linear transfer of the horizontal displacement detection rod 311 , and thus the first balance point E1 is spaced apart from the zero point of the horizontal detector 340 . The horizontal detector 340 measures the distance at which the horizontal displacement detection rod 311 deviates from the first balance point E1, and is a first axis error that is a horizontal installation error along the first axis (I) direction. detected with The first axis error is displayed as a digital numerical value through the first display unit 341 so that the user can easily identify it.

The horizontal displacement in the first direction (I) may be tensioned or compressed based on the first balance point (E1) depending on the contact aspect between the contact hole (320) and the test tool. When the horizontal displacement detection rod 311 is tensioned from the first balance point E1, it is expressed as a positive error (+x), and when it is compressed, it is expressed as a negative error (-x).

A third axis error is detected simultaneously with the first axis error by the same method. The vertical displacement of the center of the contact hole results in linear transfer of the vertical displacement detection rod 312 , and thus the second balance point E2 is spaced apart from the zero point of the vertical detector 350 . The vertical detector 350 measures the distance at which the vertical displacement detection rod 312 deviates from the second balance point E2, and a third axis error that is a vertical installation error along the third axis (III) direction. detected with The third axis error is displayed as a digital numerical value through the second display unit 351 so that the user can easily identify it.

According to the contact aspect between the contact hole 320 and the test tool, the vertical displacement in the third direction may be tensioned or compressed based on the second balance point E2 . When the vertical displacement detection rod 312 is tensioned from the second balance point E2, it is expressed as a positive error (+z), and when it is compressed, it is expressed as a negative error (-z).

When the contact hole 320 and the test tool are in contact, the displacement of the center of the contact hole 320 occurs simultaneously along the first and third axis (I, III) directions, and the horizontal displacement and vertical displacement are the first and second It occurs simultaneously along three axes (I, III). Accordingly, the first axis error and the third axis error are simultaneously detected and displayed on the first and second display units 341 and 351, respectively. That is, the first axial error and the third axial error of the central position of the attachment spindle can be simultaneously detected by one measurement at the same location without changing the measurement position.

The first axis error and the third axis error are detected and stored as digital data, and the test tool is separated from the contact hole 320 . At this time, the horizontal and vertical displacement detection rods 311 and 312 are restored to the first and second balance points E1 and E2, respectively.

Then, the fixed frame 200 is rotated so that the horizontal displacement detecting rod 311 is aligned along a second axis (II) direction perpendicular to the first axis (I) direction. For example, when the coupling member 210 or the coupling member 220 is rotated by 90° around the coupling shaft 142, the alignment direction of the vertical displacement detection rod 312 does not change and the horizontal displacement The detection rod 311 is aligned along the second axis (II) direction. Accordingly, the center position of the contact hole 320 at the same detection position on the table is changed from the I-III plane to the II-III plane.

Then, when the contact hole 320 and the test tool are brought into contact, the center position of the contact hole 320 is simultaneously changed along the second and third axis (II, III) directions, and the horizontal and vertical displacement of the contact hole center is It occurs simultaneously along the second and third axes (II, III). Accordingly, the horizontal detector 340 detects the separation distance from the first balance point E1 of the horizontal displacement detection rod 311 in the second direction II as a second axis error. In this case, since the third axis error detected in the II-III plane and the third axis error detected in the I-III plane are the same, they can be ignored.

Therefore, the first axis error, the second axis error, and the third axis error can be directly detected by only two measurements at the same detection position on the table without changing the measurement position. According to the conventional installation error detection method, one-axis error, two-axis error, and three-axis error must be measured at different positions, so it was individually measured at each detection location, but according to the attachment installation error detection device according to the present invention, Installation errors in 1-axis, 2-axis, and 3-axis directions can be detected with just two measurements at the same detection location without changing the location of the measurement location.

In particular, since the numerical values displayed on the first and second display units 341 and 351 directly indicate the installation error regarding the spindle center position of the attachment, the installation error is separately determined based on the measured value measured by the error detection device as in the prior art. no need to calculate Since the horizontal and vertical detectors 340 and 350 detect the installation error of a specific attachment in a state where the zero point is aligned with the working coordinates, the values detected by the horizontal and vertical detectors 340 and 350 can be directly used as a correction value for the central position of the attachment. .

Optionally, the attachment installation error detection device 500 converts the installation error detected by the horizontal and vertical error detectors 340 and 350 into digital data and transmits the installation error transmission unit 400 to the processing machine. can do.

For example, the installation error transmission unit 400 includes a first transmitter 410 provided in the horizontal detector 340 and a second transmitter 420 provided in the vertical detector 350 . The first transmitter 410 converts the first and second errors into digital data and transmits them to a control console (not shown) of the processing machine, and the second transmitter 420 converts the third axis error into digital data. sent to the control console. In this embodiment, the installation error transmission unit 400 may include a wireless transmission unit such as Wi-Fi.

According to the attachment installation error detection device according to an embodiment of the present invention, the installation error for the spindle center position of the attachment along each axis direction of the three-dimensional spatial coordinate system only by two measurements at a single position on the table without movement of the measurement point can be detected. Accordingly, it is possible to significantly reduce the installation error detection time compared to the conventional detection device that calculates each axial installation error by individual measurement at three different measurement points. In particular, when an installation error needs to be detected for each arrangement angle of a ram unit and a test tool, such as an angle attachment or a universal attachment, the installation error detection time can be significantly reduced.

In addition, by converting the detected installation error into digital data and automatically transmitting it to the control console of the processing machine, it is possible to prevent the error of the installation error input compared to the conventional method of individually inputting the measured installation error. Accordingly, it is possible to remarkably increase the correction accuracy for the spindle center position of the head attachment. In particular, when an automatic attachment changer capable of automatically exchanging attachments is provided in the processing machine, the adjustment of the attachment center position using the attachment exchange and installation error input and installation error is automatically performed by the numerical control program, thereby improving the processing speed of the processing machine. Work efficiency can be significantly improved.

Although the above has been described with reference to the embodiments of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below. You will understand that you can.

Claims (6)

a body fixed to a single detection position on the table top surface of the processing machine and having a coupling shaft protruding from the surface;
a fixed frame rotatably disposed about the coupling axis of the body; and
The head attachment having a ball shape and a contact hole in contact with the test tool of the head attachment coupled to the processing machine, and a displacement detection rod in contact with the contact hole and disposed on the fixed frame and movable in proportion to the displacement of the contact hole An error detector for individually detecting an installation error with respect to the spindle center position of
The error detector is an attachment installation error detecting device disposed so that a zero point coincides with a balance point, which is a position of the displacement detecting rod by contact between the test tool coupled to the reference attachment and the contact hole. According to claim 1, wherein the displacement detection rod,
A horizontal displacement disposed parallel to the upper surface of the table, moving in proportion to a horizontal displacement that is a horizontal component of the displacement of the contact hole, and having the horizontal displacement by contact with the test tool coupled to the reference attachment as a first balance point detection rod; and
A vertical displacement disposed perpendicular to the upper surface of the table, moving in proportion to a vertical displacement that is a vertical component of the displacement of the contact tool, and having the vertical displacement by contact with the test tool coupled to the reference attachment as a second balance point. Attachment installation error detection device including a detection rod. The horizontal displacement detecting rod according to claim 2, wherein the fixing frame includes a coupling member coupled to the coupling shaft, a coupling member fixed to the coupling member, and a horizontal member coupled to the coupling member parallel to the table. is disposed in parallel with the horizontal member through the connection member, and the vertical displacement detection rod passes through the horizontal member and is disposed below the horizontal member. The method of claim 2, wherein the error detector comprises:
a horizontal detector connected to the horizontal displacement detection rod so that the first balance point and the zero point coincide with each other and detecting a separation distance at which the horizontal displacement detection rod deviates from the first balance point as a horizontal installation error that is a horizontal component of the installation error; and
a vertical detector connected to the vertical displacement detection rod so that the second balance point and the zero point coincide with the vertical displacement detection rod, and detecting a separation distance that the horizontal displacement detection rod deviates from the second balance point as a vertical installation error that is a vertical component of the installation error; Attachment installation error detection device provided. 5. The method of claim 4, wherein the horizontal installation error is a first axial error detected along a first axial direction of the spatial coordinate system that is a width direction of the table and a second axial direction of the spatial coordinate system that is a longitudinal direction of the table. A second axial error is detected, and the vertical installation error includes a third axial error detected along a third axis of the spatial coordinate system that is a height direction of the table, wherein the installation error is the first in the spatial coordinate system. Attachment installation error detection device specified by the thru|or 3rd axis error. The attachment installation error detection apparatus according to claim 1, further comprising an installation error transmission unit that converts the installation error detected by the error detector into digital data and transmits it to the processing machine.

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