JP6620723B2 - Plate gap correction device - Google Patents

Description

  The present invention relates to a plate gap correcting device.

  Various products such as automobiles are designed using computer aided design (CAD). Further, computer aided engineering (CAE) for performing analysis and simulation using such CAD data is performed. The design efficiency is improved by feeding back the result of simulation or the like by CAE to the design. As described above, various proposals have been made regarding a system for linking CAD and CAE.

  For example, when designing a vehicle body of an automobile that welds and joins a plurality of sheet metal parts, designers design using CAD and predict the life of a welded part by CAE using CAD data. Simulate in advance. At this time, the CAD data is modeled by a shell element using a finite element method (FEM). The modeled data is simulated by CAE.

  In such a case, the modeled CAD data is converted into a CAE model. As a result, the CAE model may not be consistent with the CAD data that is the original design data. In such a case, a simulation or the like is performed after correcting the CAE model. In addition, after creating the CAE model, the simulation may be repeated by changing parameters such as plate thickness. The CAE model after such parameter change may not be consistent with the CAD data. In such a case, a simulation or the like is performed after correcting the CAE model.

  In Patent Document 1, a plurality of parts to be welded at predetermined points are modeled by shell elements, and a welded portion is modeled by 1D elements, and a gap that is a length dimension of the 1D elements is corrected. A clearance correction apparatus that executes the correction method and the clearance correction method has been proposed.

  Such a plate gap correcting device includes a plane portion detecting means for detecting a plane portion including a hitting point from the shell element model, and a plane portion on which the 1D element intervenes based on the detected plane portion and 1D element. Grouping means for grouping as follows, and among the plane parts belonging to such a group, one plane part is set as a reference plane part, and the order in which the plane parts belonging to such a group are moved with reference to the reference plane part, Order determining means for determining each group.

JP 2013-101440 A

  However, the element that needs to be corrected in the CAE model is not limited to the gap. That is, in the CAE model, there is a case where a back-cutting element of a part that has been back-cut is missing. In such a case, the CAE model cannot be corrected even by using the clearance correction method or the clearance correction device.

  The present invention has been made in order to solve such a problem, and provides a plate gap correcting device that can correct the lack of a back-cutting element.

  According to the present invention, there is provided a plane gap correction device that detects a plurality of planes including the hit points from the component data, based on component data in which a plurality of parts to be welded at predetermined hit points are modeled by shell elements; A grouping unit for grouping a plurality of planes on which the 1D element is interposed as a group based on the detected planes and a 1D element in which a weld at the hit point is modeled by a 1D element; And a determination unit that determines the absence of a back-tracing element included in the plane of the group, and corrects a gap that is a length dimension of the 1D element of model data in which the shell element and the 1D element are integrated. The gap correction device, wherein the determination unit detects whether or not the connection between the plane and the 1D element in the group is in a loop state, In modifying the plate gap in the group that is in-loop state, the model data is to determined to contain a missing back cutting element.

  With such a configuration, it is possible to detect the loop state from the grouped elements, and when it is necessary to correct the gap, it is determined whether the back-cutting element is not solved by the gap correction.

  The “plate gap” refers to the distance between a plurality of parts joined by welding, and more specifically refers to the length of each 1D element of model data modeled by the 1D element. In the present specification, the term “plate gap” is used in the same meaning hereinafter.

  “Back-cut” refers to a state in which a step is provided on the part. For example, when a part of two plate members are overlapped and joined to each other, in order to make the main surfaces of the two plate members follow a predetermined reference surface, a back cutting process is performed on one of the plate members. .

  According to the present invention, it is possible to provide a clearance correction apparatus that can determine whether a back-cutting element is missing.

It is a functional lineblock diagram of board gap correction device 10 concerning an embodiment. It is a perspective view of the component 30 used as the object of modeling by a shell element. It is a figure for demonstrating the model 40 modeled by the shell element. It is a schematic diagram for demonstrating the components 30 before modeling by a shell element. It is a schematic diagram for demonstrating the CAD model 40 which modeled CAD data. It is a schematic diagram for demonstrating the state which converted the CAD model 40 into the CAE model 50. FIG. It is a perspective view for demonstrating the specific example of the components 80 containing a back cut. It is a schematic diagram of the modeling data 90 of the part 80 including a back cut. It is a schematic diagram which shows the loop state of the modeling data 90 'with which the cross-cut element is missing. It is a flowchart which shows the clearance gap correction method of the clearance gap correction apparatus concerning embodiment.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a functional configuration diagram of a plate gap correction device 10 according to the embodiment. When a CAE model is created based on predetermined CAD data for a plurality of parts to be welded at predetermined hit points, the clearance correction apparatus 10 can correct the clearance modeled by the 1D element in a short time. To do. The plate clearance correction device 10 performs processing according to the present embodiment by executing a predetermined program in a computer. Further, the plate gap correction device 10 exchanges data with each other via the design unit 20 and the information exchange unit 21.

  The plate gap correction device 10 includes a check unit 11, a plane detection unit 12, a grouping unit 13, an order determination unit 14, a moving unit 15, and a determination unit 16. Hereinafter, each component of the plate gap correction apparatus 10 will be described.

  The check unit 11 calculates the gap and determines whether the calculated gap is a specified dimension. Specifically, the check unit 11 calculates the dimension between the planes from the plane data in the vicinity of the welding spot P in the CAD data, reads the dimension of the element which is the plate gap at the spot P, and compares them. The check unit 11 calculates the correction amount of the gap based on the calculated gap and the specified dimension.

  The plane detection unit 12 detects a plane part including the hit point P in the part data modeled by the shell element based on the position information of the hit point P. Subsequently, the plane detection unit 12 detects whether or not the adjacent plane unit is connected within a predetermined angle range from the detected plane unit. The plane detection unit 12 detects shell elements constituting the plane part including the hit point P by recursively detecting shell elements connected within a predetermined angle range.

  The grouping unit 13 groups the plane parts detected by the plane detection unit 12 for each plane part connected by interposing 1D elements. That is, the grouping unit 13 detects a plane part connected by interposing 1D elements. Further, the grouping unit 13 groups related plane parts as one group based on these detection results.

  The order determination unit 14 determines, for each group, the order in which the plane portions grouped by the grouping unit 13 are moved. For example, the largest plane among the grouped planes is set as the reference plane, and the correction of the gap is advanced without moving the reference plane.

  The moving unit 15 adjusts the distance between the plane units based on the moving order determined by the order determining unit 14.

  The determination unit 16 detects that the connection between the plane and the 1D element in the group is in a loop state. That is, based on the connection of the shell elements and 1D elements in the group, the connection of each connected element is detected starting from a predetermined plane portion. As a result, when the plane portion where the detection is started is detected again, this group is detected as a loop state. Further, the determination unit 16 determines that the model data includes missing back-cutting elements when correcting the gap in the group in the loop state.

  Next, the design unit 20 and the information exchange unit 21 will be described. The design unit 20 is a computer that creates CAD data. The design unit 20 creates CAD data for a predetermined part based on an operation of a designer or the like. The CAD data created by the design unit 20 is sent to the plate gap correction device 10 via the information exchange means 21. The information exchanging means 21 is provided between the design unit 20 and the plate gap correction device 10 so as to exchange data with each other. The information exchanging means 21 is specifically a communication bus between computers.

  Next, modeling with shell elements will be described with reference to FIGS. FIG. 2 is a perspective view of the component 30 to be modeled by the shell element. The component 30 includes a plate member 31 and a plate member 32. Further, welding is performed at the hit point P between the plate-like member 31 and the plate-like member 32. Therefore, the plate-like member 31 and the plate-like member 32 are metal members formed by press working, casting, rolling or the like. The welding at the spot P is spot welding.

  Next, FIG. 3 will be described. FIG. 3 is a diagram for explaining a model 40 modeled by shell elements. The component 30 described in FIG. 2 is processed into CAD data that can be handled by a computer by CAD. The CAD data is converted into a model by a shell element as illustrated in FIG. 3 by CAE of a computer provided with the design unit 20 or the plate clearance correcting device 10. The plate-like member 31 in FIG. 2 becomes the element 41 in FIG. The plate-like member 32 in FIG. 2 becomes the element 42 in FIG. Elements 41 and 42 are converted to shell elements 45 and nodes 60, respectively. The node 60 is configured to coincide with the hit point P. The element 41 and the element 42 do not include the thickness information that the plate-like member 31 and the plate-like member 32 have. The CAD model 40 is generated by integrating the shell elements and 1D elements generated in this way.

  Next, the mechanism by which the thickness direction is determined for each element in the component 30 will be described with reference to FIGS. In addition, a description will be given of a case where correction is necessary for elements in the thickness direction of the component 30.

  FIG. 4 is a schematic diagram for explaining the component 30 before modeling by the shell element. FIG. 4 shows the thickness direction of the component 30. As described above, in the component 30, the plate-like member 31 and the plate-like member 32 are joined at the hit point P by welding. The plate member 31 has a plate thickness T1, and the plate member 32 has a plate thickness T2. For such parts, designers simulate the life of welding by CAE. By performing simulation, it is possible to determine the welding spot position, the number of spots, the thickness of each member, and the like.

  In FIG. 4, for example, the life when a load F is applied in the shearing direction with respect to the welding at the spot P is predicted by simulation. In such a case, the component 30 does not include the thickness element of each plate-like member, and the welding of the hit point P is converted into a model having a predetermined length by the 1D element.

  FIG. 5 is a schematic diagram for explaining a CAD model 40 obtained by modeling CAD data. Based on the CAD data created by the designers, the computer performs modeling using a shell element that does not have a thickness element, with one of the common surfaces of the plate-like member 31 and the plate-like member 32 as a reference surface. Do. In FIG. 4, the elements 41 and 42 have the upper surfaces of the plate member 31 and the plate member 32 as reference surfaces, respectively. As a result, the element 41 is generated from the plate member 31 and the element 42 is generated from the plate member 32. The element 41 and the element 42 are connected to each other at the node 60 by an element 70 modeled by a 1D element.

  Here, the length of the element 70 is a “plate gap”. That is, in FIG. 5, the plate gap L is equal to the plate thickness T <b> 1 of the plate-like member 31.

  Next, a case where CAD data is converted into the CAE model 50 will be described. FIG. 6 is a schematic diagram for explaining a state in which CAD data is converted into the CAE model 50. In the CAE model 50, the neutral surface of each plate-like member, that is, the position of the half thickness of the plate serves as a reference surface in order to perform simulation and the like with high accuracy. That is, the plate member 31 is modeled with the position of the thickness T1 / 2 of the plate member 31 as a reference plane. As a result, element 51 is generated. The plate-like member 32 is modeled using the position of the thickness T2 / 2 of the plate-like member 32 as a reference plane. As a result, element 52 is generated. The element 51 and the element 52 are connected to each other at the node 61 by an element 71 modeled by a 1D element.

  Here, the length of the element 71 is “blank gap”. That is, in FIG. 6, the plate gap L is (T1 + T2) / 2.

  As described above, the CAD clearance 40 may not be the same between the CAD model 40 modeled from CAD data and the CAE model 50 modeled by CAE due to different reference planes. In such a case, when CAD data is used in CAE, it is necessary to perform a simulation by CAE after modifying the CAD model 40.

  Next, with reference to FIGS. 7 to 10, processing of the plate gap correction device 10 when the back-cutting element is missing will be described. FIG. 7 is a perspective view for explaining a specific example of the component 80 including a back cut. In FIG. 7, the component 80 includes a member a, a member b, and a member c. The member b overlaps the member c. Moreover, the member a has overlapped on the member b and the member c. Moreover, the member a and the member b are welded. Similarly, the member b and the member c are welded, and the member c and the member a are welded. In the case of such a configuration, the component 80 has a back cut d. In the present embodiment, the mesh portion in FIG. 7 is simulated by CAE.

  Next, a CAE model based on the part 80 will be described with reference to FIG. FIG. 8 is a schematic diagram of the modeling data 90 of the part 80 including the back cut d. In FIG. 8, the member a is modeled as an element 81, an element 85, and an element 82. The member b is modeled as an element 83. Member c is modeled as element 84. The welding between the member a and the member b is modeled as an element 91, the welding between the member b and the member c is modeled as an element 92, and the welding between the member a and the member c is performed as an element 93. Modeled.

  Thus, since the member a is welded to each of the member b and the member c, the member a is divided into an element 81 and an element 82 having different heights, and the spine d is modeled as an element 85. Yes.

  Next, with reference to FIG. 9A, a case will be described in which a model in which the back cut element 85 is missing is generated for the component 80. FIG. FIG. 9 is a schematic diagram of the modeled data 90 'lacking the back-cutting element. In FIG. 9, member a is modeled as element 81 '. That is, in FIG. 9, unlike the case of FIG. 8, the member a of the component 80 is modeled as a flat member having no back cut.

  By the way, as described with reference to FIG. 1, the grouping unit 13 groups the plane portions of the modeled data 90 '. Referring to FIG. 9A, in the modeled data 90 ', the element 81' and the element 83 are connected by an element 91 '. Similarly, the element 83 and the element 84 are connected by the element 92. Further, the element 81 ′ and the element 84 are connected by an element 93. Based on the above relationship, the grouping unit 13 determines the element 81 ′, the element 83, and the element 84 as one group.

  Next, the loop state of the modeled data 90 'will be described with reference to FIG. As described with reference to FIG. 1, the determination unit 16 detects whether or not the connection between the plane in the group and the 1D element is in a loop state. In FIG. 9A, the element 81 ′, the element 83, and the element 84 are one group. The element 81 ′ is connected to the element 83 through the element 91 ′. The element 83 is connected to the element 84 through the element 92. The element 84 is connected to the element 81 ′ via the element 93. Thus, the modeled data 90 'is in a loop state. That is, the determination unit 16 detects that the group of the modeled data 90 'is in a loop state.

  Next, with reference to FIGS. 9A to 9C, a description will be given of a case where the clearance is corrected in the group in the loop state. Comparing the modeled data 90 of FIG. 8 with the modeled data 90 ′ of FIG. 9A, the sheet gap 91′L of the element 91 ′, which is the welding of the sheet A and the sheet B in the modeled data 90 ′, is , Smaller than the clearance 91L of the element 91 in the modeled data 90. That is, the plate gap correcting device 10 needs to correct the plate gap 91'L to the plate gap 91L. Therefore, the sheet clearance correction device 10 performs a process of correcting the sheet clearance 91 ′ L based on the determination by the order determination unit 14. Here, a case where the order determination unit 14 uses the element 84 as a reference will be described. In this case, the sheet clearance correcting device 10 tries to correct the sheet clearance by moving the element 84 in this order without moving the element 84.

  First, the clearance correction device 10 corrects the clearance 91'L to the clearance 91L by moving the element 83. As a result, as shown in FIG. 9B, the gap between the element 81 'and the element 83 is corrected to the gap 91L. However, since the gap between the element 83 and the element 84 is the gap 92'L, further correction is required.

  Therefore, the plate gap correcting device 10 corrects the plate gap 92'L to the plate gap 92L by moving the element 81 'and the element 83. As a result, as shown in FIG. 9C, the gap between the element 83 and the element 84 is corrected to the gap 92L. However, since the gap between the element 81 'and the element 84 becomes the gap 93'L, further correction is required.

  Subsequently, the plate gap correcting device 10 moves the element 83 again to correct the plate gap 93'L to the plate gap 92L. As a result, the modeled data 90 'is again in the state shown in FIG.

  In this way, the plate clearance correction device 10 repeats correction of the same element in the group. For this reason, the correction process does not converge. That is, in this way, in the model with the missing cross-cut element, the modeled data in which the grouped elements are in the loop state is corrected for the missing cross-cut element before performing the clearance correction process. It is necessary to keep.

  As described above, the determination unit 16 determines that there is a missing back-cutting element in an element that needs to be corrected by detecting the loop state described in FIG. When it is determined that the modeled data is missing the traversal element, the designer or the like corrects the modeled data.

  Next, with reference to FIG. 10, a description will be given of a clearance correction process including a process of correcting missing occlusion elements. FIG. 10 is a flowchart illustrating a plate gap correction method of the plate gap correction apparatus according to the embodiment.

  First, the plate clearance correction device 10 acquires node information corresponding to 1D elements from CAD data (step S101). More specifically, the sheet clearance correction device 10 acquires position information related to the welding spot corresponding to the 1D element from the CAD data.

  Next, the check unit 11 compares the CAD data at each hit point with the length of the modeled 1D element to determine whether or not the plate gap is within a predetermined range (step S102). When the gap at each hit point is within a predetermined range (step S102: Yes), each gap is set correctly. In that case, the plate gap correction device 10 ends the process.

  On the other hand, if there is an element whose clearance is not within the predetermined range (step S102: No), the clearance is not set correctly and correction is required. In that case, the sheet gap correction device 10 proceeds to step S103 and performs a process of correcting the sheet gap.

  In step S103, the plane detection unit 12 detects the plane part modeled by the shell element as described with reference to FIG. 1 (step S103).

  Next, as described with reference to FIG. 1, the grouping unit 13 groups the plane portions (step S104).

  Subsequently, the determination unit 16 detects a loop structure for each group (step S105). When the determination unit 16 does not detect the loop structure (step S105: No), there is no missing occlusion element in the target modeled data. Therefore, the clearance correction apparatus 10 proceeds to a process of generating clearance correction information (step S108).

  On the other hand, when the determination unit 16 detects a loop (step S105: Yes), there is a possibility that a back-tracing element is missing in the target model. Therefore, the sheet clearance correction device 10 determines that there is a missing back-tracing element (step S106). Here, the sheet clearance correction device 10 is configured to correct a group in which a missing back-cutting element exists after a predetermined process. Specifically, the corresponding group performs processing such as displaying on the computer display device that there is a missing trait element. Thereby, after completion of the predetermined clearance correction process, the designers can correct the lack of the back-cutting element. Here, the plate clearance correction device 10 can also be made into a block so that the elements in the loop state are moved together as a plane portion. By doing so, it is possible to suppress the plate gap correction process from entering a loop state, and to shorten the processing time.

  Next, the check unit 11 generates plate gap correction amount information (step S107). More specifically, the check unit 11 generates the correction information of the gap by calculating the difference between the CAD data at each hit point and the length of the modeled 1D element.

  Subsequently, the order determination unit 14 determines the order of movement of the plane portions (step S108). Further, the plate clearance correcting device 10 moves the plane portion based on the order determined by the order determining unit 14. The plate gap is appropriately corrected by the movement of the plane portion.

  For the modeled data in which the plane portion has moved, the check unit 11 again compares the CAD data at each hit point with the modeled 1D element length to determine whether the gap is within a predetermined range. Determination is made (step S102).

  By performing the above processing, the sheet clearance correction device 10 can determine the absence of the back-cutting element in addition to the conventional sheet clearance correction processing. That is, it is possible to provide a plate gap correcting device that can determine the absence of a back-cutting element.

  Note that when it is determined in step S106 that the back-cutting element is missing, the processing of the plate gap correction device 10 can be temporarily stopped. In that case, the process can be restarted after the designer or the like corrects the traversing element.

  Note that the present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 Plate gap correction apparatus 11 Check part 12 Plane detection part 13 Grouping part 14 Order determination part 15 Movement part 16 Determination part

Claims (1)

A plane detection unit that detects a plurality of planes including the hit points from the component data based on component data in which a plurality of parts to be welded at predetermined hit points are modeled by shell elements;
A grouping unit for grouping a plurality of planes on which the 1D element is interposed as a group based on the detected planes and a 1D element in which a weld at the hit point is modeled by a 1D element;
A determination unit for determining the absence of a back-tracing element included in the plane of the group,
A gap correction device for correcting a gap that is a length dimension of the 1D element of model data obtained by integrating the shell element and the 1D element,
The determination unit
Detecting whether the connection between the plane and the 1D element in the group is in a loop;
When correcting the gap in the group in the loop state, the gap correction device determines that the model data includes missing back-cutting elements.

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