JP2012083821A - Numerical control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a numerical control device capable of more easily performing the measurement work of a measurement object.SOLUTION: A numerical control device having a function for detecting interference by using a 3D model includes: a simulation unit 4' of the numerical control device for, on the basis of the 3D models of a structure and a traveling object to which information indicating whether or not position information of the 3D model is accurate is applied as attribute information, performing the arithmetic operation of the positions of the 3D models; and an NC device unit 2' for driving a machine 3 and the simulation unit 4' based on a numerical control command. When the overlapping of the 3D models is detected, the NC device unit 2' determines whether or not the position information on the 3D models whose overlapping has been generated is accurate, and when it is determined that the position information is accurate, instructs the machine 3 and the simulation unit 4' to stop the execution of the numerical control command, and when it is determined that the position information is not accurate, instructs the machine 3 and the simulation unit 4' to continue the execution of the numerical control command while outputting a warning.

Description

  The present invention relates to a numerical control apparatus having a 3D model and having a simulation function of detecting interference by detecting an overlap of 3D models.

  Patent Document 1 discloses a numerical control device that detects interference using a 3D model. In this numerical control device, the NC device unit sends an axis movement command to the machine tool and the simulation unit. The machine tool controls the movement of the moving body of the machine tool in accordance with the axis movement command. The simulation unit holds a 3D model of an article involved in machining such as a machine, a jig, a material, or a tool, and controls the movement of the 3D model of the moving body according to an axis movement command. Then, it is checked whether or not there is an overlap in the 3D model space between the 3D model of the moving object and the other 3D model. As a result of the check, if there is an overlap, it is determined that there is interference, and if there is no overlap, it is determined that there is no interference. In the case of “with interference”, the simulation and the driving of the machine tool are stopped immediately before the overlap of the 3D models.

  Conventionally, a position measurement technique for measuring the position of an object to be measured by a measuring device provided in a machine tool or the like is known. In such a technique, when a contact body (for example, a touch sensor) of a measurement device contacts a measurement object such as a material or a jig, a sensor ON signal is output from the measurement device, and the contact body at that time The position is measured as the position of the measurement object.

  FIG. 1 is a block diagram showing the configuration of such a conventional numerical control apparatus, and FIG. 3 is a flow chart of a control flow in the numerical control apparatus.

  The NC unit 2 sends sensor feed start commands 7 and 8 to the machine tool 3 and the simulation unit 4 (S1). The machine tool 3 and the simulation unit 4 operate according to the commands 7 and 8. Specifically, the machine tool relatively moves the contact body and the measurement object so that the contact body of the measuring device gradually approaches the measurement object. The simulation unit 4 also performs axis movement control in a 3D model space using a 3D model such as a machine, a jig, a material, a tool, and a contact body, as in an actual machine tool.

  In this process, when the contact body of the measuring device comes into contact with the measurement object, the NC device unit 2 receives the sensor ON signal 11 from the sensor signal receiving unit 5 (Yes in S2). When the sensor ON signal is present, the NC device unit 2 sends the sensor feed end commands 12 and 13 to the machine tool 3 and the simulation unit 4, respectively, and ends the process (S6).

  On the other hand, if the NC device unit 2 receives the signal of the interference detection 9 from the simulation unit 4 before receiving the sensor ON signal 11 (Yes in S3), the NC device unit 2 determines that the interference is detected.

  In this case, the NC device unit 2 sends temporary stop commands 14 and 15 to the machine tool 3 and the simulation unit 4, respectively (S4). The machine tool 3 and the simulation unit 4 stop operating according to this command.

  After the temporary stop command, an instruction from the user is sent to the NC unit 2 via the graphic user interface unit (hereinafter referred to as “GUI unit”) 1 (S5). If the instruction 10 from the user is “continue sensor feed”, the process returns to step S2. On the other hand, when the instruction 10 from the user is “Sensor feed stop”, the sensor feed end commands 12 and 13 are sent to the machine tool 3 and the simulation unit 4 to finish the process (S6).

JP 2006-195862 A

  By the way, in such a numerical control device capable of detecting interference by detecting the overlap of the 3D models, the position of the 3D model on the 3D model space, the position of the article attached to the actual machine, Are controlled on the assumption that they match. However, in order to correctly set the position of the 3D model, it is necessary to measure the position of the article in advance using a measuring device such as a touch sensor.

  However, until the measurement operation is completed, the position of the 3D model and the position of the article attached to the actual machine do not coincide with each other.

  For example, it is assumed that the 3D model of the measurement object is in front of the actual object with respect to the traveling direction of the touch sensor. In this case, when the touch sensor is brought close to the measurement object in the machine tool, the 3D model of the touch sensor is measured in the 3D model space even though the touch sensor is not actually in contact with the measurement object. An overlap with the 3D model of the object may occur. In this case, the “interference detection” signal of the 3D model is generated before the “sensor ON” signal, and as a result, there may be a temporary stop.

  In this case, in order to continue the operation, it is necessary for the user to perform a process of removing the attribute information of the measurement object from the object of interference detection such as not to make the object of interference detection, and the operation is troublesome. There are challenges. In addition, there is a problem that the defined 3D model cannot be used.

  Specifically, this problem will be described with reference to FIGS. When it is set that the 3D model of the measurement object is in front of the actual object with respect to the direction in which the touch sensor approaches, the NC device unit 2 does not touch the measurement object even though the touch sensor is not in contact with the measurement object. The signal of the interference detection 9 from the simulation unit 4 is received. This is a case where it is determined that there is no sensor ON signal in the determination of sensor ON in step S2 and that interference is detected in the determination of detecting interference in step S3. At this time, the NC unit 2 sends temporary stop commands 14 and 15 to the machine tool 3 and the simulation unit 4 (S4). In response to this command, the machine tool 3 and the simulation unit 4 perform processing for stopping the operation. In order to continue the measurement work in such a case, it is necessary to give an instruction 10 from the user such as disabling interference detection from the GUI unit 1 to the NC device unit 2 (S5).

  Accordingly, an object of the present invention is to provide a numerical control device that can reduce such labor.

  The numerical control device of the present invention calculates the position of a structure and a moving body, which are a machine structure, a tool, a jig, and a workpiece, using a 3D model of the structure and the moving body, based on a numerical control command. In the numerical control device having a function of detecting interference by detecting an overlap between the 3D models, based on the 3D model to which information indicating whether the position information of the 3D model is accurate is given as attribute information , A simulation unit that calculates the position of the 3D model, and a control unit that drives the machine and the simulation unit based on a numerical control command, and the control unit detects an overlap of the 3D model The position information of the 3D model is determined based on the attribute information of the 3D model in which the overlap has occurred. If it is determined to be correct, the machine and the simulation unit are instructed to stop executing the numerical control command. If it is determined that the position information is not accurate, a warning is output and the numerical control command is continued to be executed. The simulation unit is instructed.

  In a preferred aspect, the machine measures the position of the measurement object by contacting the measurement object that is the structure or moving body arranged at an unspecified position, and the measurement result is a numerical value. In the case of including a touch sensor that outputs to a control device, the control unit may actually detect the overlap between the 3D model of the measurement object and the 3D model of the touch sensor by the simulation unit and the machine. When the touch sensor and the position where the measurement object is in contact are compared and the two positions match, the attribute information is updated to content indicating that the position information is accurate.

  In the prior art, the position of the 3D model is uncertain until the measurement operation is completed, and thus the interference of the 3D model may be detected even if the touch sensor is not actually in contact. In this case, the touch sensor cannot be brought close to the measurement object continuously unless the user performs an instruction to remove the measurement object from the interference detection or an instruction to ignore the interference and continue. On the other hand, according to the present invention, attribute information indicating whether or not the position of the 3D model is accurate is given. Therefore, even if interference is detected, the touch sensor is moved if the position of the 3D model is uncertain. Can do. Thereby, a user's operation can be reduced and operativity can be improved.

  In the prior art, when the interference is detected, the user has performed an instruction to remove the measurement object from the interference detection or an instruction to continue to ignore the interference, so it is clear that the 3D model is uncertain. there were. On the other hand, in the present invention, when the attribute assigned to the 3D model is “position information is uncertain”, it is difficult to understand that the position information of the 3D model is uncertain because the operation can be continued as it is. In order to avoid this, when an interference is detected and the attribute assigned to the 3D model is “uncertain”, an alarm is displayed. Thereby, the user can recognize that the position information of the 3D model is uncertain.

It is a block diagram which shows the structure of the numerical control apparatus in a prior art. It is a block diagram which shows the structure of the numerical control apparatus in this embodiment. It is a flowchart which shows the flow of the position measurement process in a prior art. It is a flowchart which shows the flow of the position measurement process in this embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing the configuration of the numerical control apparatus according to the embodiment of the present invention, and FIG. 4 is a flowchart showing a control flow of the numerical control apparatus. In the following, the same elements as those in the prior art (FIGS. 1 and 3) are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

  The machine data storage unit 6 ′ stores 3D models of articles involved in machining such as machines, jigs, materials, tools, and touch sensors. Each 3D model is previously assigned an attribute value related to the position information indicating that the position information of the 3D model is “accurate” or “uncertain”. The NC device unit 2 ′ corresponds to a control unit that controls the drive of the machine 3 and the simulation unit 4 ′, and an “allowable value” is given to the NC device unit 2 ′.

  When measuring the position of the measurement object, the NC device unit 2 'sends sensor feed start commands 7 and 8 to the machine tool 3 and the simulation unit 4', respectively (S1). In accordance with this command, the machine tool 3 and the simulation unit 4 'operate. Specifically, the machine tool 3 relatively moves the touch sensor so that the touch sensor gradually approaches the measurement object. Further, the simulation unit 4 ′ starts axis movement control on the 3D model space so as to move in the same manner as an actual machine tool. However, the axis movement control in the 3D model space is performed prior to the axis movement control in an actual machine. This is because when interference is detected in the 3D model space, before the interference is detected in the actual machine, the drive of the machine is stopped and the actual interference is surely prevented.

  When receiving the sensor ON signal 11 from the sensor signal receiving unit 5 when the touch sensor of the measuring device comes into contact with the measurement object, the NC device unit 2 'determines that “the sensor ON signal is present” (S2). In the case of “with sensor ON signal”, the NC device unit 2 ′ sends sensor feed end commands 12 and 13 to the machine tool 3 and the simulation unit 4 ′, and ends the process as usual (S <b> 6).

  Further, when the NC device unit 2 ′ receives the interference detection 9 signal from the simulation unit 4, it is determined that the interference is detected (S 3). On the other hand, if it is not determined in step S3 that interference has been detected, the process returns to step S2.

  Here, when interference is detected in the state of “no sensor ON signal” in step S2 (No in step S2 and Yes in step S3), the simulation unit 4 ′ is measured from the machine data storage unit 6 ′. The attribute value 18 given to the 3D model of the object is acquired and transmitted to the NC device unit 2 ′ (S10).

  The NC device unit 2 ′ that has acquired the attribute value 18 determines whether the attribute value is “accurate” or “uncertain” (S 11). When the attribute value is “accurate”, the NC device unit 2 ′ sends the sensor feed end commands 12 and 13 to the machine tool 3 and the simulation unit 4 ′, and ends the process (S 6).

  On the other hand, when the attribute value is “uncertain”, the NC device unit 2 ′ instructs the GUI unit 1 to display the first alarm 17 (S12), and acquires the current position of the touch sensor measured by the measurement device. (S13). After the process of step S13, the sensor ON signal is determined (S14). If “sensor ON signal is present”, it is determined whether the amount of movement from the position where the interference is detected is 0 (S15).

  If the movement amount is 0 in the determination in step S15, the NC device unit 2 'sends a command 19 for changing the attribute value to "accurate" to the simulation unit 4'. Upon receiving this command, the simulation unit 4 'sends a command 20 for changing the attribute value to "accurate" to the machine data storage unit 6' (S16). Thereafter, the NC device unit 2 'sends the sensor feed end commands 12 and 13 to the machine tool 3 and the simulation unit 4' (S6), and the process is terminated.

  In step S15, if the amount of movement from the position where the interference is detected is not 0, the NC device 2 ′ sends the sensor feed end commands 12 and 13 to the machine tool 3 and the simulation unit 4 ′ (S6), and the process is finished. To do.

  If “no sensor ON signal” in step S14, the current position is acquired (S17). Subsequently, the NC device unit 2 ′ determines that the distance calculated from the difference between the position acquired in step S17 and the position acquired in step S13, that is, the amount of movement from the position where the interference is detected is an allowable value. It is determined whether it is larger (S18).

  When the movement amount from the position where the interference is detected is larger than the allowable value, the NC device unit 2 'instructs the second alarm display 21 to the GUI unit 1 (S19). Thereafter, sensor feed end commands 12 and 13 are sent to the machine tool 3 and the simulation unit 4 '(S6), and the process is terminated. On the other hand, when the amount of movement from the position where the interference is detected is not larger than the allowable value, the process returns to step S14, and the processes of steps S14 to S18 are repeated again.

  DESCRIPTION OF SYMBOLS 1 GUI part, 2, 2 'NC apparatus part, 3 Machine tool, 4, 4' Simulation part, 5 Sensor signal receiving part, 6, 6 'Machine data storage part.

Claims (2)

Based on the numerical control command, the position of the structure and the moving body, which is a mechanical structure, tool, jig, and workpiece, is calculated using the 3D model of the structure and the moving body, and the overlap between the 3D models is calculated. In a numerical control apparatus having a function of detecting interference by detecting,
A simulation unit that calculates the position of the 3D model based on the 3D model to which information indicating whether the position information of the 3D model is accurate is given as attribute information;
A control unit that drives the machine and the simulation unit based on the numerical control command;
With
When the simulation unit detects an overlap of the 3D model, the control unit determines whether or not the position information of the 3D model is accurate based on attribute information of the 3D model in which the overlap has occurred. Is determined to be accurate, the machine and the simulation unit are instructed to stop execution of the numerical control command. When the position information is determined to be incorrect, a warning is output and execution of the numerical control command is continued. And instruct the simulation department,
A numerical controller characterized by that. The numerical control device according to claim 1,
The machine measures the position of the measurement object by contacting the structure or the moving object that is arranged at an unspecified position, and outputs the measurement result to the numerical controller. If you have a touch sensor,
The control unit includes a position where an overlap between the 3D model of the measurement object and the 3D model of the touch sensor is detected by the simulation unit, and a position where the touch sensor and the measurement object actually contact each other in the machine. , And if both positions match, the attribute information of the measurement object is updated to content indicating that the position information is accurate.
A numerical controller characterized by that.

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