JP2010134826A - Controller for machine tool and control method of machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a controller for a machine tool and a control method for the machine tool, reducing time and labor for registration for displaying an abnormal portion. <P>SOLUTION: The controller 10 for the machine tool includes a machine tool control means 13 (control means), a simulation means 14, a model display means 15, an identification means 16, a highlighted display means 17, and an abnormal information display means 18. In addition, the controller has: an interfering object determining means 19 which determines whether there is an interfering object between the abnormal portion and the viewpoint or not; a viewpoint search means 20 which searches the viewpoint with a minimum interference ratio if it is determined that there may be an interfering object; a viewpoint change means 21 which changes the position to the searched viewpoint; and an interfering object display change means 22 which changes and displays the display mode of the interfering object so that the interfering ratio should be below an allowable value if the interfering ratio is above the allowable value for the changed viewpoint, and which displays the interfering object as it is if the interfering ratio is below the allowable value. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a machine tool control apparatus and a machine tool control method for controlling a machine tool (including peripheral devices).

  In general machine tools, parts (also referred to as “parts”, the same shall apply hereinafter) such as parts, members, jigs, tools, sensors, etc. that constitute and operate the machine tool are controlled. A machine tool controller is provided. This machine tool control device is provided with an operation panel including input devices, display devices, and the like, together with a numerical control device that performs numerical control.

Conventionally, when an abnormality occurs in any of the parts constituting the machine tool, a function of displaying on the display device is provided so that the abnormal part can be easily grasped (see, for example, Patent Document 1). According to the technique of Patent Document 1, in order to make it easy for anyone to understand an abnormal part at the site, the abnormal part is displayed by a simulated display using a three-dimensional shape model of a machine tool.
JP 2006-85328 A

However, in the technique of Patent Literature 1, when an abnormality occurs in any of the parts constituting the machine tool, an operation for registering abnormality display information necessary for displaying the abnormal part on the display device is performed in advance. There must be. In this work, depending on the abnormal part, there is a possibility that an interference object exists between the viewpoint (that is, the position where the operator views the abnormal part). Even a simulated display using a three-dimensional shape model is displayed in almost the same manner in synchronism with the machine tool, so that the state of an abnormal part cannot be recognized (confirmed) due to an obstacle. For this reason, an operator (such as an operator or a registrant) must create and register a state where there is no interference. Since there are many parts where there is a possibility of occurrence of abnormality, time and labor were required for the registration work.
In addition, if an abnormality occurs, it is superimposed on the display of the 3D shape model, and anomaly information indicating the content of the anomaly and the coping procedure is displayed in the vicinity of the abnormal part. Various colors are used for the purpose of facilitating identification. For this reason, if the color of the abnormality information coincides with the color of the three-dimensional shape model at the display location of the abnormality information, the abnormality information becomes difficult to read.

  The present invention has been made in view of the above points, and provides a machine tool control apparatus and a machine tool control method that can reduce time and labor compared to the conventional registration work for displaying an abnormal part. For the purpose.

(1) Means for solving the problem (hereinafter, simply referred to as “solution means”) 1 is a control means for controlling a machine tool and an operation of the machine tool in response to a communication signal output from the control means. The simulation means for simulating the three-dimensional shape model of the machine tool in synchronization with the machine, the model display means for displaying the three-dimensional shape model of the machine tool being simulated, and an abnormality based on the communication signal. In a machine tool control device comprising: an identification unit that identifies an abnormal site that has occurred; a highlighting unit that highlights and displays the abnormal site; and an abnormality information display unit that displays abnormal information regarding the abnormal site. An interfering object judging means for judging whether or not an interfering object exists between the part and the currently set viewpoint, and a case where the interfering object judging means judges that there is an interfering object. Includes a viewpoint searching means for searching for a viewpoint with the smallest interference rate, a viewpoint changing means for changing the position to the viewpoint searched by the viewpoint searching means, and an interference rate for the viewpoint changed by the viewpoint changing means is allowed. An interference object display changing means for displaying the interference object by changing the display form of the interference object so that the interference rate is less than the allowable value if the value exceeds the value, and displaying the interference object as it is when the interference rate is less than the tolerance value It is summarized as having.
The “display mode” corresponds to, for example, color (including transparent and semi-transparent. The same applies hereinafter), display position, enlargement / reduction ratio, line type, fill pattern, and the like. The “allowable value” may be set to a uniform value for the entire machine tool, may be set to an appropriate value for each part, and it does not matter whether the value is zero or not.

  According to the solution 1, when the interference determination unit determines that there is an interference, the viewpoint search unit searches for the viewpoint with the minimum interference rate, and the viewpoint change unit changes the position to the searched viewpoint. . Then, the interference object display changing means changes and displays the display mode of the interference object so that the interference rate becomes equal to or less than the allowable value when the interference rate exceeds the allowable value. Thus, when an abnormal part is identified by the identification means, a state equal to no interfering object interfering when the abnormal part is viewed from the viewpoint is automatically created. Therefore, since the operator only has to register the created state, time and labor can be reduced compared with the conventional registration work for displaying the abnormal part.

(2) The solution means 2 is the machine tool control device described in the solution means 1, and the viewpoint search means changes the angle while keeping the distance to the viewpoint centered on the abnormal part and searches the angle. The gist is to perform a search using one or both of the search function and the distance search function for searching by changing the distance while maintaining the angle to the viewpoint.

  According to Solution 2, the angle search function changes only the angle (elevation angle, depression angle, azimuth angle) to search the viewpoint that minimizes the interference rate, and the distance search function changes only the distance to minimize the interference rate. Search for the viewpoint that becomes. Since the viewpoint search means operates one or both of the angle search function and the distance search function, it is possible to reliably specify the viewpoint having the minimum interference rate.

(3) The solving means 3 is the machine tool control device described in the solving means 1 or 2, and includes the abnormality information displayed by the abnormality information display means and the three-dimensional shape model displayed by the model display means. Similar color determination means for determining whether there is a three-dimensional shape model that has a similar color, and abnormal information if the similar color determination means determines that a similar three-dimensional shape model exists. When one or both of the abnormal information and the 3D shape model is changed so that the 3D shape model can be identified and displayed, and it is determined that there is no 3D shape model of the same color The gist of the present invention is to have a duplicate display avoiding means for displaying as it is.

  According to the solution means 3, when a similar color three-dimensional shape model exists by the similar color determination means, the duplicate display avoidance means changes the display form of one or both of the abnormal information and the three-dimensional shape model. indicate. Since this change display makes it possible to identify the abnormality information and the three-dimensional shape model, the contents of the abnormality information, the shape of the abnormal part, and the like can be accurately grasped.

(4) The solving means 4 is the machine tool control device described in the solving means 3, and the duplicate display avoiding means determines that the similar color determining means determines that a similar color three-dimensional shape model exists. The gist is to change one or both of the color and the display position for one or both of the abnormal information and the three-dimensional shape model.

  According to the solving means 4, since the overlapping display avoiding means changes one or both of the color and the display position, it becomes easy to identify the abnormal information and the three-dimensional shape model.

(5) The solution means 5 is a control method for a machine tool, the control means for controlling the machine tool, and the tertiary of the machine tool in synchronization with the operation of the machine tool upon receiving a communication signal output from the control means. Simulation means for simulating the original shape model, model display means for displaying the three-dimensional shape model of the machine tool being simulated, and identification for identifying an abnormal part where an abnormality has occurred based on the communication signal Means, highlighting means for highlighting and displaying the abnormal part, and abnormality information display means for displaying abnormal information regarding the abnormal part, and there is an interference between the abnormal part and the currently set viewpoint. An interfering object determining step for determining whether there is an interfering object, and a viewpoint searching step for searching for a viewpoint with a minimum interference rate when it is determined by the interfering object determining step that there is an interfering object; If the interference rate exceeds the allowable value for the viewpoint changing step for changing the position to the viewpoint searched by the viewpoint searching step, and the viewpoint changed by the viewpoint changing step, the interference rate is less than the allowable value The gist of the present invention is to include an interfering object display changing step of displaying the interfering substance as it is when the interference form is changed and displayed and the interference rate is equal to or less than an allowable value.

  According to the solving means 5, like the solving means 1, when the abnormal part is identified by the identifying means, a state equal to no interfering object is produced automatically when the abnormal part is viewed from the viewpoint. Therefore, since the operator only has to register the created state, time and labor can be reduced compared with the conventional registration work for displaying the abnormal part.

(6) The solution means 6 is the machine tool control method described in the solution means 5, and in the viewpoint search step, the angle for searching by changing the angle with the distance to the viewpoint maintained around the abnormal part. The gist is to perform a search using one or both of the search function and the distance search function for searching by changing the distance while maintaining the angle to the viewpoint.

  According to the solving means 6, similarly to the solving means 2, the viewpoint is searched by operating one or both of the angle search function and the distance search function, so that the viewpoint can be specified reliably.

(7) The solving means 7 is the machine tool control method described in the solving means 5 or 6, wherein the abnormality information displayed in the abnormality information display step and the three-dimensional shape model displayed in the model display step are A similar color determination step for determining whether there is a three-dimensional shape model that has a similar color, and abnormal information when it is determined by the similar color determination step that a three-dimensional shape model of a similar color exists When one or both of the abnormal information and the 3D shape model is changed so that the 3D shape model can be identified and displayed, and it is determined that there is no 3D shape model of the same color The gist of the present invention is to have a duplicate display avoidance step for displaying as it is.

  According to the solving means 7, as with the solving means 3, the abnormality information and the three-dimensional shape model can be identified, so that the contents of the abnormality information, the shape of the abnormal part, and the like can be accurately grasped.

(8) The solving means 8 is the machine tool control method described in the solving means 7, and in the overlap display avoiding step, when it is determined by the similar color determining step that a three-dimensional shape model of the similar color exists. The gist is to change one or both of the color and the display position for one or both of the abnormal information and the three-dimensional shape model.

  According to the solving means 8, as in the solving means 4, one or both of the color and the display position are changed, so that the abnormal information and the three-dimensional shape model can be easily identified.

  According to the present invention, since the operator only has to register the created state, time and labor can be reduced compared with the conventional registration work for displaying an abnormal part.

The best mode for carrying out the present invention will be described with reference to the drawings.
In the following description, unless otherwise specified, the term “machine tool” simply refers to not only the machine tool main body but also the whole including peripheral devices provided around the machine tool main body. In addition, when referring to directions such as up, down, left, and right, the description in the drawings is followed.

  First, FIG. 1 shows a block diagram of a configuration example of a machine tool control device. For example, a computer (including a personal computer) is applied to the machine tool control device 10, and the storage device 12 or machine tool control means 13 for controlling the operation of the machine tool (corresponding to “control means” in claims) or the like. Is provided. In addition, an interface board (for example, an NC board) for inputting / outputting signals to / from the machine tool body 30 and an interface board (for example, a PLC board) for inputting / outputting signals to / from peripheral devices 31 ), A simulation program for simulating and displaying a three-dimensional shape model of a machine tool and related data.

  The machine tool control device 10 shown in FIG. 1 includes a comprehensive management means 11, a storage device 12, a machine tool control means 13, a simulation means 14, a model display means 15, an identification means 16, an emphasis display means 17, and anomaly information display. Means 18, interference object judgment means 19, viewpoint search means 20, viewpoint change means 21, interference object display change means 22, similar color judgment means 23, duplicate display avoidance means 24, abnormality display registration means 25, and the like. Among these, the machine tool control means 13 includes a machine tool main body control means 13a for controlling the main body of the machine tool, a peripheral equipment control means 13b for controlling the peripheral equipment 31, and the like. With respect to these means, for example, when a three-dimensional shape model of a machine tool is displayed on the display device 32, two or more means cooperate such that the simulation means 14 and the model display means 15 cooperate. May be executed.

  The comprehensive management means 11 manages the entire machine tool control apparatus 10. Specifically, first, based on a signal from the input device 33, a control signal for the operation of the machine tool is output to the machine tool control means 13 in accordance with a predetermined sequence. Second, it receives various detection signals (for example, signals output from an encoder, limit switch, etc.) input from the machine tool and comprehensively manages the operation process. Third, the simulation means 14, the model display means 15, the identification means 16, the highlight display means 17, the abnormality information display means 18, the interference object judgment means 19, the viewpoint search means 20, the viewpoint change means 21, and the interference object display change means. 22, the similar color determination means 23, the duplicate display avoidance means 24, the abnormal display registration means 25, and the like are comprehensively managed. In addition, when an abnormality is detected by an abnormality detector (for example, a temperature sensor, an atmospheric pressure sensor, or a limit sensor) provided in the machine tool main body 30, an alarm lamp or the like is turned on from the peripheral device control means 13b, or the machine tool main body control is performed. Control such as stopping the operation of the machine tool main body 30 is performed through the means 13a.

For example, the storage device 12 using a recording medium such as a hard disk device or a magneto-optical disk device has various controls including the above-described simulation program and related data, and the following data (1) and (2). Programs and related data are stored in advance.
(1) When a machine tool is configured with a three-dimensional model composed of a plurality of parts (parts), identification data (for example, ID, proper name, etc.), three-dimensional shape data, three-dimensional coordinate data, etc. for each part This is static part data. The parts are parts, members, jigs, tools, sensors, etc. constituting the machine tool. In the following, the term “three-dimensional shape model” includes the case of referring to all or some of a plurality of parts.
(2) When each part is made to correspond to a detection signal detected when the machine tool is operating, dynamic part data such as identification data of the part or three-dimensional coordinate data according to the detection signal It is.

  The simulating means 14 is based on the three-dimensional shape data and three-dimensional coordinate data of each part stored in advance in the storage device 12, the control signal to the machine tool, and the detection signal from the machine tool. A three-dimensional shape model is created, and a simulation operation using the three-dimensional shape model is performed. Also, it has a function of changing the viewpoint position and the enlargement / reduction ratio of the three-dimensional shape model based on an instruction input from the operator through the input device 33. The model display unit 15 converts the three-dimensional shape model of the machine tool that is simulated by the simulation unit 14 into a signal that can be displayed on the display device 32 described later, and outputs the signal.

  The identification unit 16 identifies an abnormal part where an abnormality has occurred based on a communication signal (including the detection signal described above) input from the machine tool. Whether or not an abnormality has occurred is determined based on whether or not data such as a threshold set for each region is satisfied. The abnormal part identified by the identifying unit 16 is highlighted on the display device 32 by the highlighting unit 17, and the abnormal information is displayed on the display device 32 by the abnormality information display unit 18.

  The form of “highlighted” and displayed is arbitrary. For example, changing to a color different from that of a neighboring part, blinking display, enlarging / reducing, changing a line type, changing a filling pattern, and the like are applicable. “Abnormal information” is the contents related to the abnormal part, such as the name and model number, the part specifying information for identifying the abnormal part, the cause of the abnormality (including possible causes), and the work at the time of occurrence The environment (for example, temperature, atmospheric pressure, humidity, etc.) is applicable. Note that it is desirable to display recovery information such as operating time, tool life, precautions, replacement procedure, contact information, etc. so that the recovery can be performed in a short time.

  The interfering object judging means 19 judges whether or not there is an interfering object between the abnormal part and the currently set viewpoint (hereinafter, simply referred to as “viewpoint” unless otherwise specified). Since a technique for determining whether or not an interfering object exists between two points (in this example, between an abnormal site and a viewpoint) is not described in this specification. The “interfering object” corresponds to a component part of a machine tool excluding an abnormal part, a member used for processing or assembly, and the like.

  The viewpoint searching means 20 searches for a viewpoint having a minimum interference rate when the interference object determining means 19 determines that there is an interference object, and when it is determined that there is no interference object, the currently set viewpoint Is used as is. The search for the viewpoint is centered on the abnormal part, the angle search function to search by changing the angle while maintaining the distance to the viewpoint, and the distance search function to search by changing the distance while maintaining the angle to the viewpoint One or both of the functions are used. The viewpoint and the specific search method will be described later (see FIGS. 3 and 4).

  The viewpoint searched by the viewpoint searching means 20 is set (that is, changed) as a new viewpoint by the viewpoint changing means 21.

  When the viewpoint is changed by the viewpoint changing unit 21, the interference object display changing unit 22 changes the display mode of the interference object so that the interference rate becomes equal to or less than the allowable value when the interference rate exceeds the allowable value. If the interference rate is less than the allowable value, the interference is displayed as it is. The “interference rate” is obtained by the ratio of the occupation amount occupied by the interference object to the reference amount (area, volume, etc.). The “allowable value” regarding the interference rate can be set arbitrarily, and may be set to a uniform value for the entire machine tool, or an appropriate value may be set for each part, and the value is zero. Whether or not. The “display form” corresponds to an arbitrary form for displaying an interference object such as a color, a display position, an enlargement / reduction ratio, a line type, a fill pattern, and the like. The change of the display form can be applied to any change that makes it easy to see the abnormal part, and is changed for one form or a combination of two or more forms.

  The similar color determination unit 23 determines whether or not there is a 3D shape model in which the abnormality information displayed by the abnormality information display unit 18 and the 3D shape model displayed by the model display unit 15 have similar colors. Judging. The display form of the abnormality information is arbitrary, and the information content may be displayed on the screen as it is or may be displayed in a predetermined display area. The “similar colors” include not only the same color but also approximate colors such as a boundary that is not clear even if the colors are separated.

  The duplicate display avoidance unit 24, when the above-described similar color determination unit 23 determines that there is a similar color three-dimensional shape model, the abnormality information and the three-dimensional shape model can be identified. The display mode is changed to one or both of the three-dimensional shape models. The change in the display mode corresponds to a change in color, a change in display position, or the like. In this example, a change in color (that is, a change to a different color) is applied. The “foreign color” is a color excluding the same color, and it is desirable that the boundary becomes clear when it is separately applied. On the other hand, if it is determined that there is no similar color three-dimensional shape model, the current color is displayed as it is.

  The abnormality display registration unit 25 stores the abnormality display information in the storage device 12 when the operator performs a required operation using the input device 33. “Abnormal display information” is a content for displaying an abnormal part in an easy-to-understand manner for the operator, and specifically corresponds to information and content currently displayed on the display device 32. When the configuration example of FIG. 1 is followed, the abnormality display information is stored in the storage device 12 through the comprehensive management means 11.

  Any machine tool body used for processing, assembly, or the like can be applied to the machine tool body 30. A machine tool that grinds or superfinishes a workpiece (such as a crankshaft for a vehicle) corresponds to this. The peripheral device 31 is a device provided around the machine tool main body 30 and corresponds to, for example, a safety device, an emergency stop switch, an alarm lamp, or the like. As the display device 32, for example, a liquid crystal display, an EL display, a plasma display, a CRT, or the like is used. As the input device 33, any device having a function of inputting instructions, data, and the like to the machine tool control apparatus 10 can be applied, and examples thereof include a touch panel, a tablet, a keyboard, a mouse, and the like. The operation panel may be configured by integrating the display device 32 and the input device 33.

  In the machine tool control apparatus 10 configured as described above, a process from when an abnormality occurs during operation of the machine tool to registration of abnormality display information regarding the abnormality is described with reference to FIGS. explain. Here, FIG. 2 is a flowchart showing an example of the procedure for the abnormal display registration process, and FIG. 3 is a flowchart showing an example of the procedure for the viewpoint search process. FIG. 4 is a perspective view showing the relationship between the abnormal part, the viewpoint, and the conical cylinder. FIG. 5 shows an example of a screen displayed on the display device. 6 and 7 are plan views of FIG. 4 as viewed from above. FIG. 6 shows an example in which the conical cylinder is rotated, and FIG. 7 shows an example in which the distance is expanded and contracted. FIG. 8 shows an example of a screen displayed on the display device after changing the viewpoint position.

  2 and 3, the simulation unit 14 causes the three-dimensional shape model of the machine tool to perform a simulation operation in synchronization with the operation of the machine tool, and the model display unit 15 performs the simulation operation. A process of displaying the three-dimensional shape model of the machine tool on the display device 32 is executed. Since these processes are well-known techniques, illustration and description thereof are omitted.

  First, in FIG. 2, it is determined whether or not an abnormality has occurred in any of the parts constituting the machine tool [step S10]. Specifically, the identification unit 16 identifies an abnormal part where an abnormality has occurred based on a communication signal input from the machine tool. If there is no abnormal part, it cannot be identified (NO), and the abnormal display registration process is finished as it is.

  If an abnormal part exists in the aircraft (YES; in-flight), a cover or the like is seen through in order to make the abnormal part easy to see from the viewpoint (step S11). “In-flight” includes not only inside the aircraft but also inside the case and box. “Cover etc.” includes cases and boxes in addition to covers. “Perspective” includes temporary movement of a cover or the like, transparency (including translucency), and the like.

After seeing through the cover or the like, or when an abnormal part exists outside the machine in step S10 (YES; outside the machine), a conical cylinder (that is, a conical shape) is obtained based on the distance between the abnormal part and the viewpoint. [Step S12]. When displaying the abnormal part on the display device 32, the size of the abnormal part is stored in the storage device 12 in advance, so that the ratio is appropriate for displaying the predetermined part at a predetermined size (for example, the center of the screen). Needs to be scaled. The distance (h) is uniquely determined according to this ratio, and the angle (θ) between the center line passing through the apex of the conical cylinder and the hypotenuse is obtained according to the following equation (1). The coefficient (k) is a constant value, but generally, since the structure and shape of each part are various, an appropriate value is set for each part.
Angle (θ) × Distance (h) = Coefficient (k) (Equation 1)

  In the example of FIG. 4, the abnormal part 40 and the viewpoint 44 are separated by a distance h, the viewpoint 44 is positioned at the center of the viewpoint plane 43, and a conical cylinder 41 having an angle θ is formed. The viewpoint plane 43 has a circular shape having a radius r, and schematically illustrates a window region when the operator views a part on the machine tool main body 30 in practice. Further, an interfering object 45 is located between the abnormal part 40 and the viewpoint 44, and the surface at this position is assumed to be the interference surface 42. Although the abnormal part 40 is highlighted and displayed by the highlighting means 17, in FIG. 4 and subsequent figures, the line type is represented by a bold line for convenience.

In the state shown in FIG. 4, when the simulation unit 14 and the model display unit 15 display the three-dimensional shape model of the machine tool on the display device 32, a screen display as shown in FIG. This screen display is an example of a state in which the abnormal part 40 is viewed from the viewpoint 44 (viewpoint plane 43), and in addition to the interference 45 and the viewpoint plane 43, an abnormal information display area 46 and the like are also displayed. . The abnormality information display area 46 occupies a part of the display area of the display device 32, and abnormality information regarding the abnormal part 40 is displayed by the abnormality information display means 18.
Note that, as shown by the hatched hatches in FIG. 5, a part of the interfering object 45 enters the interference surface 42 and interferes, and a part of the abnormality information display area 46 not only enters the viewpoint plane 43 but also an abnormal part. Part of 40 is difficult to see.

  Returning to FIG. 2, after obtaining the conical cylinder in step S12, the interfering object judging means 19 determines whether or not an interfering object exists between the abnormal part and the viewpoint [step S13]. The line connecting the abnormal part and the viewpoint is set as the center line, and the processing is divided depending on whether the interference is on the left side or the right side of the center line (steps S14 and S15). Steps S14 and S15 both execute the viewpoint search process, but only the direction in which the cone is rotated is reversed. In order to simplify the description, an example of interference on the left side of step S14 will be described below.

  In the viewpoint search process of the example procedure shown in FIG. 3, the angle search function is first executed. Specifically, the conical cylinder obtained in step S12 is rotated in the azimuth direction by a predetermined angle (for example, 5 °, 10 °, etc.) [step S30]. According to the example of FIG. 6, the interference object 45 is positioned on the left side of the center line, and thus is rotated counterclockwise (in the direction of the arrow D <b> 2) around the conical cylinder 41. Although not shown in the figure, in the case of step S15, the interference object 45 is located on the right side of the center line. Therefore, the interference object 45 may be rotated clockwise around the conical cylinder 41 (the direction opposite to the arrow D2 direction). In this case, the viewpoint moves from the viewpoint position 44a to the viewpoint position 44b. In FIG. 6, the state before rotation is represented by a solid line, and the state after rotation is represented by a two-dot chain line in FIG. The interference object 45 does not interfere with the conical cylinder 41 at a position where the conical cylinder 41 is rotated by an angle φ (same as the predetermined angle or multiple times thereof).

If the total angle of the rotation performed in step S30 is less than one rotation (that is, 360 °) (NO in step S31), the interference rate of the interferer is obtained at the position after the rotation [step S32]. Since the interference rate is the ratio of the occupation amount to the reference amount, in the example of FIG.
Interference rate = reference amount (area of interference surface 42) / occupation amount (area of hatched portion of interference 45) × 100

  If the interference rate obtained in step S32 exceeds an allowable value (for example, 0%, 10%, 15%, etc.) (NO in step S33), steps S30 to S32 described above are repeated. On the other hand, if the interference rate obtained in step S32 is equal to or smaller than the allowable value (YES in step S33), the viewpoint search process is finished as it is.

  If the interference rate does not fall below the allowable value even if steps S30 to S33 are repeated and the total angle of the rotation performed in step S30 exceeds one rotation (YES in step S31), the distance search function is executed. Specifically, the position of the viewpoint is moved by a predetermined distance (for example, 10 mm or 20 mm) in the expansion / contraction direction (arrow D4 direction) to expand / contract the distance [step S34]. According to the example of FIG. 7, the distance (h) is extended to reduce the angle of the conical cylinder 41 in order to avoid the interference 45 that has entered the conical cylinder 41. Specifically, when the distance before the extension (ha) is extended to the distance after the extension (hb), the viewpoint moves from the viewpoint position 44a to the viewpoint position 44c. Regarding the conical cylinder 41, in FIG. 7, the state before expansion is represented by a solid line, and the state after expansion is represented by a two-dot chain line. As described above, when the interference object 45 enters the conical cylinder 41, the distance may be increased. Conversely, when the interference object 45 is separated from the conical cylinder 41, the distance is reduced to the original distance (hc). That's fine.

  Returning to FIG. 3, if the expansion / contraction performed in step S34 is within the range of the predetermined distance (NO in step S35), the interference rate of the interfering object is obtained in the state after the distance expansion / contraction in step S33 [step S36]. The range of the predetermined distance is a value set in advance, and is a range of distance that allows the operator to recognize the abnormal part. For example, a position away from the machine tool main body 30 by several meters or more is out of the predetermined distance because the abnormal part is too small to be recognized.

  If the interference rate obtained in step S36 exceeds the allowable value (NO in step S37), steps S34 to S36 described above are repeated. On the other hand, if the interference rate obtained in step S34 is less than or equal to the allowable value (YES in step S37), the viewpoint search process is terminated. In addition, even if steps S34 to S37 are repeated, if the interference rate does not become less than the allowable value and the expansion / contraction performed in step S34 is outside the range of the predetermined distance (YES in step S31), the distance having the minimum interference rate is set. After setting, finish the viewpoint search process.

  When the viewpoint search processing is completed, the process returns to FIG. 2 again, and after searching for the position of the viewpoint where the interference rate is equal to or less than the allowable value (that is, the interference rate is minimum) in steps S14 and S15, the viewpoint is newly updated by the viewpoint changing means 21. In addition to setting (that is, changing) as a proper viewpoint [step S16], the interference object display changing means 22 changes the display form viewed from the new viewpoint by the simulating means 14 and the model display means 15 as necessary [step S16]. S17].

In step S17, for example, even if the conical cylinder 41 is rotated once or the distance (h) is changed within a predetermined distance range, the viewpoint search process is completed without searching for a viewpoint whose interference rate is less than or equal to the allowable value. There is a case. In this case, the display form to be described later is changed.
On the other hand, when a viewpoint where the interference rate is less than or equal to the allowable value can be searched, it may be displayed without changing the display form, or the display form described later may be changed for better visibility.
The object whose display form is to be changed is arbitrary as long as interference can be eliminated, and is usually the interfering object 45, but may be the conical cylinder 41, the abnormal information display area 46, or the like.

  The change of the display form will be described with reference to FIGS. In the display form of the example shown in FIG. 5, it is difficult to see part of the conical cylinder 41 and the abnormal part 40 due to the presence of the interference 45 and the abnormal information display area 46. On the other hand, even if it is possible to search for a viewpoint at which the interference rate is less than or equal to the allowable value, it may be difficult to see through the abnormal site 40 due to the interference 45. Therefore, the interfering object display changing unit 22 changes the display form as in the following modification example.

(Modification 1) For example, as shown in FIG. 8A, only the interference object 45 is displayed transparently or semi-transparently without changing the display positions of the abnormal part 40, the conical cylinder 41 and the interference object 45.
(Modification 2) One or both of the conical cylinder 41 and the interfering object 45 is moved in a direction in which interference does not occur. For example, as shown in FIG. 5, the conical cylinder 41 is moved in the direction of the arrow D2, for example, and the interference object 45 is moved in the direction of the arrow D1, for example. FIG. 8B shows a display example after moving to a position where no interference occurs.
(Modification 3) Separately from Modifications 1 and 2, the size and shape of the abnormality information display area 46 are set so as not to cause interference according to the positional relationship of the abnormal part 40, the conical cylinder 41 and the interference 45. Change (reduce). An example after the change is shown in FIG. 8 (A) and FIG. 8 (B).

  Even if the display form is changed in step S17, it may be difficult to identify if the display colors of the abnormal information display area 46 (abnormal information) and the abnormal part 40 (three-dimensional shape model) are similar colors. When the abnormal color display unit 46 determines that the abnormal information display area 46 and the abnormal part 40 are similar colors (YES in step S18), the overlapping display avoiding unit 24 displays the abnormal part 40 and the abnormal information display area 46. One or both of the colors is changed to a different color and displayed [step S19], and the operator performs a required operation using the input device 33 so that the abnormality display registration means 25 stores the abnormality display information. 12 is registered (stored) in [Step S20], and the abnormal display registration process is completed. On the other hand, if it is determined in step S18 that the color is different (NO), the operator performs a required operation using the input device 33 to register the abnormal display information in the storage device 12 [step S20]. The abnormal display registration process is finished.

According to the embodiment described above, the following effects can be obtained.
(1) If it is determined by the interference object determination means 19 that there is an interference object 45 (see step S13 in FIG. 2), the viewpoint search means 20 searches for the viewpoint 44 having the minimum interference rate (step in FIG. 2). The viewpoint changing means 21 changes the position to the searched viewpoint 44 (see step S16 in FIG. 2). Then, the interfering object display changing means 22 changes the display form so that the interference rate becomes equal to or less than the allowable value when the interference rate exceeds the allowable value (see step S17 in FIG. 2). Thus, when the abnormal part 40 is identified by the identification means 16, when the abnormal part 40 is seen from the viewpoint 44, the state equivalent to no interfering object 45 is automatically created (see FIG. 8). Therefore, since the operator only has to register the created state (see step S20 in FIG. 2), time and labor can be reduced compared with the conventional registration work for displaying the abnormal region 40. .

(2) The angle search function of the viewpoint search means 20 searches the viewpoint 44 having the minimum interference rate by changing the angle of the conical cylinder 41 in the azimuth direction (see steps S30 to S33 in FIG. 3 and FIG. 6). ). Similarly, the distance search function searches only the viewpoint 44 where the interference rate is minimized by changing only the distance h (see steps S34 to S37 in FIG. 3 and FIG. 7). Since the viewpoint search means 20 operates one or both of the angle search function and the distance search function, the viewpoint 44 having the minimum interference rate can be reliably identified.

(3) When the similar color determining means 23 determines that there is an abnormal part 40 (three-dimensional shape model) of the same color as the abnormal information display area 46 (abnormal information) (see step S18 in FIG. 2), the overlapping display The avoiding means 24 changes one or both of the abnormal information display area 46 and the abnormal part 40 to a different color and displays them (see step S19 in FIG. 2). By this change display, the abnormal information display area 46 and the abnormal part 40 can be clearly identified, so that the contents of the abnormal information display area 46, the shape of the abnormal part 40, and the like can be accurately grasped.

[Other Embodiments]
Although the best mode for carrying out the present invention has been described above, the present invention is not limited to this mode. In other words, various forms can be implemented without departing from the scope of the present invention. For example, the following forms may be realized.

(1) In the above-described embodiment, as the angle search function of the viewpoint search means 20, the angle of the conical cylinder 41 is changed only in the azimuth direction (without changing the elevation angle and depression angle), and the interference rate is minimized. The viewpoint 44 is searched (see steps S30 to S33 in FIG. 3 and FIG. 6). Instead of (or in addition to) this form, the angle of the cone cylinder 41 is changed only in the elevation angle / decline direction (without changing the azimuth angle), or the angle of the cone cylinder 41 is changed in the azimuth direction and elevation / decline direction. The viewpoint 44 having the smallest interference rate may be searched for by changing both. If the conical cylinder 41 is viewed from above or below, the interfering object 45 may not interfere. Therefore, it is possible to reliably identify the viewpoint 44 having the minimum interference rate.

  In the example shown in FIG. 9, the interference object 45 exists above the center line passing through the apex of the conical cylinder 41. Therefore, in order to eliminate the interference, the conical cylinder 41 is rotated clockwise (in the direction of arrow D5) in the depression direction. You can do it. Although not shown, conversely, when the interference 45 is present below the center line passing through the apex of the conical cylinder 41, it may be rotated counterclockwise in the elevation direction (the direction opposite to the arrow D5 direction). In FIG. 9, the state before rotation is represented by a solid line, and the state after rotation is represented by a two-dot chain line. When the included angle between before and after the rotation is an angle ψ, the interference is eliminated, and the viewpoint moves from the viewpoint position 44a before the rotation to the viewpoint position 44d after the rotation.

(2) In the above-described embodiment, when the abnormal information display area 46 (abnormal information) and the abnormal part 40 (three-dimensional shape model) are in the same color, the duplicate display avoiding means 24 includes the abnormal information display area 46 and One or both of the abnormal parts 40 are displayed in different colors (see step S19 in FIG. 2). Instead of (or in addition to) this form, one or both of the abnormal information and the three-dimensional shape model may be changed to a display position that can be identified (in other words, moved). Even in this case, the abnormality information and the three-dimensional shape model can be easily identified.

(3) In the viewpoint search processing in the above-described embodiment, when the angle search function is executed and the interference rate is not less than the allowable value (see steps S30 to S33 in FIG. 3), the distance search function is executed. (See steps S34 to S37 in FIG. 3). Instead of this form, when the distance search function is executed and the interference rate does not fall below the allowable value, the angle search function may be executed. Alternatively, as a configuration for searching for a viewpoint where the interference rate does not fall below the allowable value while alternately executing the angle search function and the distance search function (in other words, rotating alternately in the azimuth angle direction and the elevation angle / decline angle direction). Also good. In any configuration, since one or both of the angle search function and the distance search function are operated, it is possible to reliably specify the viewpoint 44 having the minimum interference rate.

(4) In the embodiment described above, the interfering object display changing means 22 is configured to make the abnormal part 40 easy to see by changing the display form as in the first to third modification examples (see step S17 in FIG. 2). Instead of (or in addition to) this form, the line type or fill pattern of the three-dimensional shape model is changed, or a part of the interfering object 45 (the hatched portion in the example of FIG. 5) is lost. It is good also as a structure which makes it easy to see the abnormal site | part 40 by changing a display form. Regardless of the configuration, a state equivalent to the absence of an interfering object 45 that interferes when the abnormal part 40 is viewed from the viewpoint 44 is automatically created, so that the registration work for displaying the abnormal part 40 takes longer than before. And can reduce labor.

(5) In the above-described embodiment, the relationship between the angle (θ), the distance (h), and the coefficient (k) is defined in Equation 1. The angle (θ) is an angle formed by the center line passing through the apex of the cone and the hypotenuse, but the calculation formula may be defined using the solid angle (τ) applied to the apex of the cone. The calculation formula in this case is as shown in the following formula 2. The coefficient (m) is the same as the coefficient (k) except that the coefficient (m) has a value corresponding to the solid angle (τ). Even when the solid angle (τ) is used, only the angle (θ) is used, so that the same effect as the above-described embodiment can be obtained.
Solid angle (τ) × distance (h) = coefficient (m) (Expression 2)

(6) In the above-described embodiment, the conical cylinder (that is, the conical shape) is obtained based on the distance h between the abnormal portion 40 and the viewpoint 44 (see step S12 in FIG. 2 and FIG. 4). Instead of this form, other shapes such as a polygonal cone (polygonal pyramid) and a sphere (spherical shape; including an ellipse) may be obtained. By applying an appropriate shape according to the machine tool, the type of part, etc., it is possible to search for a viewpoint where the abnormal part 40 is easier to see.

It is a block diagram showing typically the example of composition of the control device for machine tools. It is a flowchart figure showing an abnormal display registration process. It is a flowchart figure showing a viewpoint search process. It is a perspective view explaining the relationship about an abnormal site | part, a viewpoint, and a conical cylinder. It is a figure showing an example of the screen displayed on the display apparatus. It is a top view showing the example which searches a viewpoint by rotating a cone cylinder to an azimuth direction. It is a top view showing the example which searches a viewpoint by expanding and contracting distance. It is a figure showing an example of the screen displayed on the display apparatus after the viewpoint position was changed. It is a top view showing the example which searches a viewpoint by rotating a conical cylinder in an elevation angle direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Machine tool control apparatus 11 General management means 12 Storage device 13 Machine tool control means 13a Machine tool main body control means 13b Peripheral equipment control means 14 Simulating means 15 Model display means 16 Identification means 17 Highlighting display means 18 Abnormal information display means 19 Interfering object judging means 20 Viewpoint searching means 21 Viewpoint changing means 22 Interfering object display changing means 23 Similar color judging means 24 Duplicate display avoiding means 25 Abnormal display registering means 30 Machine tool body 31 Peripheral equipment 32 Display equipment 33 Input equipment 40 Abnormal part 41 Conical cylinder (conical)
42 Interference surface 43 View surface 44 View point 44a, 44b, 44c, 44d View point position 45 Interfering object 46 Abnormal information display area h (ha, hb, hc) Distance r Radius k Factor θ, φ, ψ Angle

Claims (8)

Control means for controlling the machine tool, simulation means for receiving a communication signal output from the control means and simulating the three-dimensional shape model of the machine tool in synchronization with the operation of the machine tool, Model display means for displaying a three-dimensional shape model of the machine tool being identified, identification means for identifying an abnormal part where an abnormality has occurred based on the communication signal, highlighting means for highlighting and displaying the abnormal part, In a machine tool control device comprising abnormality information display means for displaying abnormality information relating to an abnormal part,
Interfering object judging means for judging whether or not an interfering object exists between the abnormal part and the currently set viewpoint;
When it is determined by the interference object determination means that there is an interference object, viewpoint search means for searching for a viewpoint where the interference rate is minimized,
Viewpoint changing means for changing the position to the viewpoint searched by the viewpoint searching means;
For the viewpoint changed by the viewpoint changing means, when the interference rate exceeds the allowable value, the interference object display mode is changed and displayed so that the interference rate is below the allowable value, and the interference rate is below the allowable value. In this case, a machine tool control device having interference object display changing means for directly displaying the interference object. The machine tool control device according to claim 1,
The viewpoint search means is an angle search function that searches by changing the angle while maintaining the distance to the viewpoint centering on the abnormal part, and a distance search function that searches by changing the distance while maintaining the angle to the viewpoint. A machine tool control device that searches using one or both of the functions. The machine tool control device according to claim 1 or 2,
Similar color determination means for determining whether there is a 3D shape model in which the abnormality information displayed by the abnormality information display means and the 3D shape model displayed by the model display means have similar colors;
One or both of the abnormal information and the three-dimensional shape model so that the abnormal information and the three-dimensional shape model can be identified when the similar color determining means determines that the three-dimensional shape model of the similar color exists. The machine tool control device further includes: a duplicate display avoiding unit that displays the display in a different form and displays the same as it is when it is determined that there is no similar three-dimensional shape model. The machine tool control device according to claim 3,
The overlapping display avoiding means determines that one or both of the abnormal information and the three-dimensional shape model are out of the color and the display position when the similar color determining means determines that a similar color three-dimensional shape model exists. Machine tool controller that changes one or both. Control means for controlling the machine tool, simulation means for receiving a communication signal output from the control means and simulating the three-dimensional shape model of the machine tool in synchronization with the operation of the machine tool, Model display means for displaying a three-dimensional shape model of the machine tool being identified, identification means for identifying an abnormal part where an abnormality has occurred based on the communication signal, highlighting means for highlighting and displaying the abnormal part, An anomaly information display means for displaying anomaly information relating to the anomalous part;
An interfering object determining step for determining whether an interfering object exists between the abnormal part and the currently set viewpoint;
When it is determined that there is an interfering object in the interfering object determining step, a viewpoint searching step for searching a viewpoint where the interference rate is minimum,
A viewpoint changing step for changing the position to the viewpoint searched by the viewpoint searching step;
For the viewpoint changed by the viewpoint changing step, when the interference rate exceeds the allowable value, the interference object display form is changed so that the interference rate is lower than the allowable value, and the interference rate is lower than the allowable value. A control method for a machine tool including an interference object display changing step of displaying the interference object as it is. A control method for a machine tool according to claim 5,
In the viewpoint search process, an angle search function that searches by changing the angle while maintaining the distance to the viewpoint centering on the abnormal part, and a distance search function that searches by changing the distance while maintaining the angle to the viewpoint A control method for a machine tool that uses one or both functions to search. A control method for a machine tool according to claim 5 or 6,
A similar color determination step for determining whether there is a 3D shape model in which the abnormality information displayed by the abnormality information display step and the 3D shape model displayed by the model display step are similar colors;
One or both of the abnormal information and the three-dimensional shape model so that the abnormal information and the three-dimensional shape model can be distinguished when it is determined that the same-color three-dimensional shape model exists in the similar color determination step. And a duplicate display avoiding step of displaying the same as it is when it is determined that there is no similar color three-dimensional shape model. A machine tool control method according to claim 7,
In the duplicate display avoidance step, if it is determined by the similar color determination step that a three-dimensional shape model of the same color exists, one or both of the abnormal information and the three-dimensional shape model are displayed in the color and the display position. A machine tool control method for changing one or both.

Images