JP2016071770A - Apparatus and method for identifying continuously welded sections in structure model - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and method for identifying continuously welded sections in a structure model which identify sections suitable for continuous welding in the structure model.SOLUTION: An apparatus 1 for identifying continuously welded sections in a structure model includes: a spot weld element generation unit 17 that densely generates spot weld elements; an optimization analysis unit 21 that selects spot weld elements that satisfy given analysis conditions; a part-pair spot weld element extraction unit 23 that extracts spot weld elements for each part pair of a structure model; an inter-spot-weld element distance computation unit 25 that derives distances between the spot weld elements for each part pair; a spot weld interval determination unit 27 that recognizes, for each part pair, a minimum inter-spot-weld element distance as a spot weld interval of each spot weld element; and a continuously welded section identification unit 29 that identifies spot weld elements with a spot weld interval no greater than a predetermined value as continuously welded sections.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to an apparatus and method for identifying a continuous bonding application site of a structure model, and mainly identifies a bonding region that is optimal for continuous bonding such as laser bonding or joint using spot welding and a structural adhesive in combination. The present invention relates to an apparatus and a method.

In recent years, especially in the automobile industry, weight reduction of a vehicle body due to environmental problems has been promoted, and analysis by computer-aided engineering (hereinafter referred to as “CAE analysis”) has become an indispensable technique for vehicle body design.
The body of an automobile is composed of thin plate components, and a monocoque structure body is formed by joining them mainly by spot welding. For this reason, in the structural body model used for CAE analysis, not only thin plate parts but also joints between parts can be modeled, and various performances as a single vehicle body can be predicted and evaluated on a computer. .

  As described above, in a monocoque structure vehicle body, the vehicle body is formed mainly by spot welding of thin plate parts. Therefore, the position of the spot welding point greatly affects vehicle body characteristics such as rigidity, vibration, and collision of the vehicle body. On the other hand, the vehicle body is designed for each part, and at that time, the position of the spot welding point, that is, the interval between the spot welding points is determined.

  However, spot welding has a problem of shunting, so it is not possible to set hit points continuously. Usually, the weld points are designed to have an interval of 30 mm or more. For this reason, spot welding points for transmitting a load from part to part are in a discretely arranged state.

  On the other hand, in continuous joining such as laser joining or joint using spot welding and structural adhesives, it is possible to join the flange part of the entire surface, and rigidity, vibration, collision, etc. The characteristics are greatly improved. Therefore, when continuous joining is applied to the entire vehicle body, a great improvement in characteristics is expected. However, when continuous joining is applied to the entire vehicle body, the total length of the joint portion is 100 m or more, and the automobile body currently manufactured with a flow line. It is extremely difficult to apply continuous bonding to all the bonding sites.

  Therefore, it is desired to improve the vehicle body characteristics by providing a continuous joint portion on a part of the vehicle body. In this case, it is conceivable to apply an optimization technique as disclosed in Patent Document 1 to a structural body model in which continuous bonding is modeled on all of the bonding sites, and to specify a site suitable for continuous bonding. .

JP 2010-250818 A

  In a normal CAE analysis, in a structural body model to be analyzed, a laser joining site or a joining site using spot welding and a structural adhesive in combination is modeled with continuous joining elements. In order to model such a joining element, it is necessary to check the matching status of the flanges of all parts, and to set the joining element to the flange according to the size of the gap. Cost.

  In addition, since the bonding width of laser bonding is about 0.5 to 1 mm, it is necessary to model the bonding portion with fine elements, which takes time. On the other hand, even in joints that use spot welding and structural adhesives together, the joint width is as wide as 5 to 10 mm, so the shape of the structure (the shape of the structure model) ) Need to be corrected.

  In the case of a vehicle body, the continuous joint part modeling or the structure modeling correction work requires a complicated work and a large number of days because the total length of the continuous joint part is 100 m or more.

  The present invention has been made in order to solve the above-described problems, and in a structural body model including a planar element and / or a three-dimensional element constituting a part, it is easily continuous without requiring complicated work. An object of the present invention is to provide an apparatus and a method for specifying a continuous bonding application site of a structure model for specifying a site suitable for bonding.

(1) The structure model continuous bonding application site specifying device according to the present invention is capable of continuous bonding with respect to a given analysis condition in a structure model including a planar element and / or a three-dimensional element constituting a part. A structure model continuous bonding application site specifying device for specifying a suitable site, wherein spot joining elements having information on a part set of a bonding site are generated densely at predetermined intervals with respect to the structure model. Spot joint element generation section, analysis condition setting section for setting analysis conditions for the structure model, and spot joint element generation for optimal spot joint elements satisfying the analysis conditions set by the analysis condition setting section An optimization analysis unit that is selected from the spot bonding elements generated by the unit, and a component combination that the spot bonding element selected by the optimization analysis unit has The component assembly spot joint element that identifies all the part assemblies included in the structure model from the information and extracts all spot joint elements that are targets of optimization analysis included in the component assembly for each component assembly The distance between spot joining elements for each part assembly, for each spot joining element, with respect to each spot joining element included in the same assembly as the spot joining element, for each spot joining element included in the extraction unit The minimum spot-joint element distance for each component assembly is selected from the spot-joint element distances obtained for each spot-joint element by the calculation part and the spot-joint-element-distance calculator, A spot bonding interval determining unit for determining the spot bonding interval and the spot bonding obtained by the spot bonding interval determining unit Of septum, it is characterized in that a continuous bonding applied part identification unit that identifies a site that is suitable for continuous joining spot joining element having a pre-specified value less spot joining intervals defined.

(2) In the structure model continuous bonding application site specifying device according to (1), the spot bonding element specified as a site suitable for continuous bonding by the continuous bonding application site specifying unit is displayed on the structure model. It is characterized by comprising a continuous bonding application site display unit for visual display.

(3) In the continuous bonding application site specifying device of the structure model described in (1) or (2) above, when the continuous bonding is laser bonding, the analysis condition setting unit is selected by the optimization analysis unit. It has a function of designating the optimum number of spot joining elements.

(4) In the continuous bonding application site specifying device of the structural body model according to (1) or (2) above, when the continuous bonding is a combination of spot welding and a structural adhesive, the analysis condition The setting unit has a function of designating the position and number of spot joining elements to be maintained as spot welding points in the optimization analysis unit and the number of spot joining elements to be selected as a site to apply the structural adhesive. To do.

(5) The continuous joint application site specifying method of the structure model according to the present invention is a continuous joint for a given analysis condition in a structure model including a planar element and / or a three-dimensional element constituting a part. A structure model continuous joint application site identification method for identifying a suitable site, in which a computer performs the following steps, and has information on a part set of a joint site for the structure model. A spot joining element generation step for generating densely at predetermined intervals, an analysis condition setting step for setting an analysis condition for the structure model, and the analysis condition set in the analysis condition setting step An optimization analysis step for selecting an optimum spot joining element from the joining elements generated in the joining element generation step; From the information related to the parts set possessed by the spot joint element selected in the optimization analysis step, all the parts sets included in the structure model are identified, and all of the targets for optimization analysis included in the parts set A spot combination element extraction step for extracting a spot joint element for each part set, and for each spot joint element included in the part set, a spot with another spot joint element included in the same part set as the spot joint element A distance calculation step between spot bonding elements for determining the distance between the bonding elements for each component assembly, and the minimum distance for each component combination among the distances between the spot bonding elements determined for each spot bonding element by the distance calculation step between the spot bonding elements. The distance between spot joining elements is selected, and this is the spot joining interval of the spot joining elements. Of the spot bonding intervals obtained in the spot bonding interval determination step and the spot bonding interval determination step, a spot bonding element having a spot bonding interval equal to or smaller than a predetermined value is specified as a portion suitable for continuous bonding. And a continuous bonding application site specifying step.

(6) In the structure model continuous joint application site specifying method according to (5), the spot joint element specified as a site suitable for continuous joining in the continuous joint application site specifying step is displayed on the structure model. It is characterized by comprising a continuous bonding application site display step for visual display.

(7) In the continuous bonding application site specifying method of the structure model according to (5) or (6) above, when the continuous bonding is laser bonding, the analysis condition setting step is selected by the optimization analysis step. The optimum number of spot joining elements is designated.

(8) In the continuous bonding application site specifying method of the structural body model according to (5) or (6) above, when the continuous bonding is a combination of spot welding and a structural adhesive, the analysis condition setting is performed. The step is characterized in that in the optimization analysis step, the position and number of spot joint elements to be maintained as spot welding points and the number of spot joint elements to be selected as a site to apply the structural adhesive are specified. .

  In the present invention, in a structure model including a planar element and / or a three-dimensional element constituting a part, a structure model continuous joining application site for specifying a part suitable for continuous joining for a given analysis condition. A spot joining element generation unit that is a specific device and generates densely at a predetermined interval for spot joining elements having information related to a set of parts to be joined to the structure model, and the structure model An analysis condition setting unit for setting analysis conditions, and an optimum spot bonding element satisfying the analysis conditions set by the analysis condition setting unit are selected from the spot bonding elements generated by the spot bonding element generation unit. Included in the structure model from the information relating to the optimization analysis unit and the parts set of the spot joint element selected by the optimization analysis unit. A component assembly spot joint element extraction unit that extracts all spot joint elements to be subjected to optimization analysis included in the component assembly for each part assembly, and each of the component assemblies For the spot bonding element, a distance calculation unit between spot bonding elements for obtaining the distance between the spot bonding elements for each part set with other spot bonding elements included in the same part set as the spot bonding element, and the distance calculation between the spot bonding elements The spot junction interval determination is performed by selecting the minimum spot junction element distance for each part set from the spot junction element distances obtained for each spot junction element by the section and determining this as the spot junction interval of the spot junction elements. And a spot that is equal to or less than a predetermined value among the spot bonding intervals obtained by the spot bonding interval determination unit Equipped with a continuous joint application part specifying unit that identifies spot joint elements with joint intervals as parts suitable for continuous joining, so that all joint parts of the structure model can be easily modeled, and further optimization analysis can be performed By doing, the site | part suitable for continuous joining can be easily specified out of all the joining sites.

It is a block diagram of the continuous joining application site | part identification apparatus of the structure body model which concerns on embodiment of this invention. It is a figure explaining the structure model (vehicle body model) concerning the example of the present invention. It is a figure explaining the production | generation method of the spot joining element in the structure body model which concerns on embodiment of this invention. It is a figure explaining the analysis conditions regarding the case of the continuous joining which concerns on embodiment of this invention (the 1). It is a figure explaining the analysis conditions regarding the case of the continuous joining which concerns on embodiment of this invention (the 2). It is a figure explaining the analysis conditions regarding the case of the continuous joining which concerns on embodiment of this invention (the 3). It is a figure explaining the method of calculating | requiring a spot joining element and a spot joining space | interval for every component assembly in the structure model which concerns on embodiment of this invention. It is a flowchart which shows the flow of a process of the continuous joining application site | part identification apparatus of the structure body model concerning embodiment of this invention. It is a figure which shows the analysis result which concerns on the Example of this invention (the 1) It is a figure which shows the analysis result which concerns on the Example of this invention (the 2) It is a figure which shows the load constraint conditions which concern on the Example of this invention. (Part 1) It is a figure which shows the load constraint conditions which concern on the Example of this invention. (Part 2)

[Embodiment]
Embodiments of the present invention will be described with reference to the drawings.
First, the configuration of the structure model continuous joint application site specifying device 1 (hereinafter simply referred to as “continuous joint application site specifying device”) will be described mainly based on the block diagram shown in FIG.

  The continuous joint application site identification device 1 according to the present embodiment continuously arranges spot joint elements used for modeling a site where parts are spot-welded on a structure model, and optimally This is a device for identifying a spot joint element suitable for continuous joining from among the spot joint elements by the analysis, and visually displaying the identified spot joint element on a structure model.

The continuous bonding application site identification device 1 is configured by a computer such as a PC (personal computer), and includes a display device 3, an input device 5, a storage device 7, a work data memory 11, and an arithmetic processing unit 13.
The arithmetic processing unit 13 is connected to the display device 3, the input device 5, the storage device 7, and the work memory 11, and performs each function according to instructions from the arithmetic processing unit 13.

<Display device>
The display device 3 is used for displaying a structure model or the like, and includes a liquid crystal monitor or the like.

<Input device>
The input device 5 is used for display instructions of the structure model file 9, input of calculation conditions by an operator, and the like, and includes a keyboard, a mouse, and the like.

<Storage device>
The storage device 7 is used for storing files and the like, and is configured by a hard disk or the like. The storage device 7 stores at least various information such as the structure model file 9.

<Structure model file>
The structure model file 9 is a file including information on a plurality of parts constituting the structure model, planes and / or solid elements constituting the parts, and the like. In some cases, the joint part is modeled by providing a spot joint element such as a beam element such as a spring or a beam or a three-dimensional element to the joint part between parts. At this time, an element representing a part and a spot joining element may be combined through a rigid element to model a joining part. In these cases, the structure model file 9 includes information regarding spot joint elements and rigid elements.

  In the structure model file 9, information such as identification numbers and point coordinates is individually recorded for these parts and elements. Further, the spot joining element is given an identification number of parts to be joined by the spot joining element and an attribute number related to the spot joining interval of the spot joining element.

  As an example of the structural body model, a vehicle body model 41 displayed on the display device 3 is shown in FIG. In the vehicle body model 41, spot joint elements 45 representing joint portions of parts 43 constituting the vehicle body are indicated by black dots in FIG. In the case of the vehicle body model 41 shown in FIG. 2, since the vehicle body is mainly formed of a thin steel plate, the part 43 in the vehicle body model 41 is configured by a planar element.

<Working data memory>
The work data memory 11 is used for temporary storage and calculation of data used in the arithmetic processing unit 13, and is composed of a RAM or the like.

<Operation processing unit>
The arithmetic processing unit 13 is configured by a CPU (Central Processing Unit) such as a PC, and each unit described below is realized by the CPU executing a predetermined program.

  The arithmetic processing unit 13 includes a structure model setting unit 15 that sets a target structure model, and a spot joint element that has information on a part set of a joint portion with respect to the structure model at predetermined intervals. A spot joining element generation unit 17 to be generated in an analysis, an analysis condition setting unit 19 for setting an analysis condition for the structure model, and an optimum spot joining element satisfying the analysis condition set by the analysis condition setting unit 19 From the optimization analysis unit 21 selected from the spot bonding elements generated by the spot bonding element generation unit 17 and the information regarding the component set given to the spot bonding elements selected by the optimization analysis unit 21, the structure A component assembly spot that identifies all component assemblies included in the body model and extracts all spot joint elements included in the component assembly for each component assembly A spot for obtaining the distance between spot joining elements for each part set with respect to each spot joining element included in the same part set as the spot joining element for each spot joining element included in the joint joining element extracting unit 23 The minimum distance between spot joining elements for each part set is selected from among the distances between spot joining elements obtained for each spot joining element by the distance computing part 25 between joining elements and the distance computing unit 25 between spot joining elements. Is determined as the spot bonding interval of the spot bonding element, and spot bonding having a spot bonding interval equal to or smaller than a predetermined value among the spot bonding intervals obtained by the bonding interval determination unit 27. A continuous joining application site specifying unit 29 for specifying an element as a site suitable for continuous joining, and a continuous joining application site specifying unit And a continuous bonding site of application display unit 31 for visually displaying the spot joining elements identified as sites suitable for continuous joint over the structure model at 9.

The configuration of each unit in the arithmetic processing unit 13 will be described in detail.
≪Structure model setting part≫
The structure model setting unit 15 reads information such as parts, elements constituting the parts, and nodes from the structure model file 9. In the structure model, the component is usually composed of planar elements, but may be a three-dimensional element or a combination of a planar element and a three-dimensional element.

≪Spot joint element generation part≫
The spot joining element generation unit 17 creates a spot joining element at the joining point or joining part of two parts to be joined in the structure model read from the structure model file 9. At this time, the spot joining elements are densely generated on the structure model so that the distance between the spot joining elements is equal to or less than a predetermined distance. For example, in normal spot welding, spot welding points are set with an interval of 30 mm or more, and therefore, the spot joining element to be optimized is preferably generated to be 10 mm or less. The generated spot joining element includes information such as an identification number of a part joined by the spot joining element, an identification number of an element constituting the part, and an attribute number related to a spot joining interval of the spot joining element. Is granted.
The various types of information that the spot joint elements have may be given before the spot joint elements are densely generated on the structure model.

  Specifically, in the structure model 51 shown in FIG. 3A, spot joining elements 55 are generated at an interval D approximately equal to the size of the planar elements constituting the part 53, and the spot joining elements include spot spots. An identification number of the part 53 to be joined, an identification number of an element constituting the part 53, and an attribute number (for example, 100) regarding the spot joining interval of the spot joining element are given.

  Alternatively, as shown in FIG. 3B, there may be a case where the spot joint element 55a is arranged in advance in the structure model file 9, but in this case, the spot joint element 55a originally arranged is used as it is. Then, as shown in FIG. 3C, a spot joining element 55b may be newly generated between the spot joining elements 55a so as to be equal to or smaller than a predetermined distance D.

As the reason why the spot joint element 55 or 55b is densely generated by the spot joint element generation unit 17 according to the present invention, a spot joint element that models a spot joint such as spot welding mounted on a normal structure, This is because the portions are modeled as continuously joined portions by being arranged densely and continuously at a certain portion. Therefore, the predetermined distance D between the spot joining elements 55 or 55b is desirably about 10 mm, which is equal to the size of the planar elements constituting the part. The element size of the spot joining elements 55, 55a and 55b is preferably equivalent to the nugget diameter assumed from the plate thickness, and generally a nugget diameter of 5 × (plate thickness) ^0.5 (mm) is generated. It is good to set the joining element which becomes.

≪Analysis condition setting section≫
The analysis condition setting unit 19 sets analysis conditions for performing optimization calculation. The analysis conditions include a condition related to the shape or required characteristics of the structure and a condition related to the spot joint element to be optimized.

  Conditions related to the shape or required characteristics of the structure include, for example, the restraint position of the structure, the position where the load is applied, the material volume ratio, the rigidity is maximized, the displacement is minimized, the stress is minimized, etc. It is done.

  On the other hand, the conditions relating to the spot joining elements include conditions relating to preprocessing for appropriately performing optimization analysis and conditions relating to the position and number of spot joining elements.

The condition relating to the preprocessing for performing the optimization analysis is to provide a fixed point that defines one or more spot joints where the parts are necessarily joined. The fixed point is selected based on the result of performing a simple structure analysis or a topology optimization analysis.
In both the simple structure analysis and the topology analysis, when the fixed point of the initial spot location is set, the spot joint element originally arranged in the structure model may be used.

  For example, (A) specify only the number of spot welding elements selected in the optimization analysis, and (B) the position of the spot welding elements to be maintained as spot welding points in the optimization analysis. And the number and the number of spot joining elements to be selected as the site to which the structural adhesive is applied.

Differences in conditions relating to spot joint elements in these optimization analyzes will be described below.
In the case of the condition (A) that specifies only the number of spot joining elements selected in the optimization analysis, for example, as shown in FIG. When the optimization analysis is executed with the number of spot joining elements selected by the optimization analysis set to 5 for the joining element 55, as shown in FIG. 4B, the spot joining element 55c to be selected and the spot to disappear The joining element 55d is obtained as a result of the optimization analysis.

  On the other hand, in the case of the condition (B) for designating the position and number of spot joining elements to be maintained as spot welding points in the optimization analysis and the number of spot joining elements to be selected as the site to apply the structural adhesive, As shown in FIG. 5 (a), the spot bonding element 55e is maintained in the optimization analysis for the spot bonding elements 55b and 55e that are densely generated at a predetermined distance D or less, and the position of the spot bonding element 55e When the number and the number to be selected from the spot bonding elements 55b are designated, the spot bonding element 55e to be maintained, the spot bonding element 55c to be selected, and the spot bonding element 55d to be eliminated are optimized as shown in FIG. Obtained as a result of analysis. The spot welding element 55e to be maintained may use the spot welding spot that was originally arranged.

The reason why the above condition (A) or (B) is given as the analysis condition for the spot joining element is as follows.
When laser bonding is applied as continuous bonding, the flange parts of the structural parts are brought into close contact with each other, and the flange parts are bonded by irradiating laser. On the other hand, when joint using spot welding and a structural adhesive in combination is applied, the flange portion of the structural component is joined by applying spot welding after applying a thermosetting resin to the joint.

  Therefore, when a site suitable for continuous joining is specified in the structure model by the apparatus and method of the present invention, when laser joining is assumed, spots to be maintained as spot welding points as shown in FIG. It suffices to specify only the laser bonding portion without specifying the bonding element.

On the other hand, assuming joint using spot welding and structural adhesive together, as shown in FIG. 5 (b), the portion 55f suitable for continuous joining is a place where the spot welding point and the structural adhesive are applied. Need to be identified.
Therefore, by selecting the analysis conditions of (A) or (B) as appropriate, a continuous bonding site is modeled in either case of laser bonding or bonding using spot welding and a structural adhesive in combination. It becomes possible.

  In the above description, in the joint using both spot welding and structural adhesive, as shown in FIG. 5A, the spot joint element 55b is generated on the coaxial line of the spot weld point, and the spot joint element 55b is generated. And the same position as the part to which the structural adhesive is applied.

  However, as shown in FIG. 6, the spot joining element 55b is generated at a position offset from the axis of the spot joining element 55e representing the spot welding point (FIG. 6A), and optimized with respect to the spot joining element 55b. You may identify the spot joining element 55c selected by analyzing, as a site | part which applies a structural adhesive agent (FIG.6 (b)). In this case, as in FIG. 5, the position and number of spot joining elements 55e to be maintained as spot welding points, and the spot to be selected as the site to which the structural adhesive is to be applied among the spot joining elements 55b to be optimized. The number of joining elements 55c is designated as an analysis condition.

≪Optimization analysis part≫
The optimization analysis unit 21 performs optimization analysis on the spot joint elements included in the structure model under the analysis conditions set by the analysis condition setting unit 19 and selects spot joint elements that satisfy the analysis conditions. .

As an optimization analysis method, topology optimization can be applied. When the density method is used in topology optimization, the discretization represented by the equation (1) is preferable when the intermediate density is large.
K (ρ) = ρ ^p K (1)
However,
K : Matrix that penalizes the element stiffness matrix
K: Element stiffness matrix
ρ: Density
p: Penalty coefficient Here, for the optimization of the spot junction element, the penalty coefficient needs to be 4 or more.
The optimization analysis unit 21 may perform a topology optimization process or may be an optimization process based on another calculation method.

≪Part assembly spot joint element extraction part≫
The part assembly spot joining element extraction unit 23 identifies all part joints in which two parts are joined, and extracts all spot joining elements included in the part assembly for optimization analysis. To do. For example, in the structure model 61 shown in FIG. 7, W _{1 to} W ₄ are used as the spot joining elements 65 of the parts set of the parts A and B, and W _{5 is used} as the spot joining element 65 of the parts set of the parts B and C. , W ₆ is extracted.

≪Spot joint element distance calculation part≫
The spot-joining-element-distance calculating unit 25 has, for each spot joining element included in the part set specified by the part-set spot joining element extracting unit 23, another spot joining element included in the same part set as the spot joining element. The distance between spot joining elements is determined for each part assembly. The distance between spot joining elements is calculated using the representative point coordinate values of each spot joining element. At this time, the shape of the spot joint element may be either a beam element or a three-dimensional element.

For example, in the case of the structure model 61 shown in FIG. 7, the distances L _{1 to} L ₃ between the spot joining elements W ₁ and the other spot joining elements W _{2 to} W ₄ of the parts set of the parts A and B are the spot joining. The calculation is performed using the coordinate value with the center point obtained from the node of the element as the representative point 67.

≪Spot junction interval determination part≫
The spot joining element determination unit 27 selects the minimum spot joining element distance from the spot joining element distances obtained for each spot joining element by the spot joining element distance calculating unit 25, and this is selected as the spot joining element distance. It is given as information of each spot joining element as a spot joining interval.
In the structure model 61 shown in FIG. 7, the spot bonding distance of spot joining elements _{W 1} is among the distances _L 1 ~L ₃ the spot joining elements _{W 1} and another spot joining elements _W 2 to _W-4, a minimum value a certain _{L 1.}

≪Continuous bonding application site identification part≫
The continuous bonding application site specifying unit 29 selects a spot bonding element having a spot bonding interval equal to or smaller than a predetermined value from the spot bonding intervals given to each spot bonding element by the spot bonding interval determination unit 27. The spot joining element is identified as a part suitable for continuous joining. Furthermore, a new attribute number different from the attribute number assigned by the spot joining element generation unit 17 is assigned to the spot joining element identified as a site suitable for continuous joining.

  For example, assuming that a spot joining element having a joining interval of a predetermined value 2D or less is a part suitable for continuous joining, the continuous joining part 55f is suitable for continuous joining as shown in FIGS. 4B and 5B. To identify the site. Further, 1001 is assigned as a new attribute number to the spot joining elements included in the continuous joining portion 55f, and no new attribute number is assigned to spot joining elements not included in the continuous joining portion 55f. The attribute number 100 assigned by the section 17 is maintained.

  Usually, in the case of spot welding, spot welding points are set with an interval of 30 mm or more to avoid the problem of diversion. Therefore, 20 mm is desirable as the predetermined value of the spot bonding interval for specifying the portion suitable for continuous bonding in the embodiment according to the present invention. In addition, by setting the spot joint elements generated by the structure model setting unit 15 to 10 mm or less, a plurality of spot joint elements are generated.

≪Continuous bonding application site display section≫
The continuous bonding application site display unit 31 displays the spot bonding element on the structure model based on the identification number and the attribute number of the spot bonding element specified as a site suitable for continuous bonding in the continuous bonding application site specifying unit 29. An instruction to be displayed is sent to the display device 3.
For example, an instruction is sent to the display device 3 to display the spot joining element assigned the attribute number 1001 by the continuous joining application site specifying unit 29 on the structure model.

  A method for identifying a part suitable for continuous joining in a structure model using the continuous joining application part identifying apparatus 1 configured as described above and displaying the part on the structure model is mainly shown in FIG. This will be described below.

  First, a structure model to be analyzed is set (S1). The structure model is a representation of the structure parts with planar elements and / or solid elements, and has various information such as the identification numbers and attribute numbers of the elements that make up the structure, and the node coordinates of each element. doing. In addition, depending on the structure model, there are joint elements in which joint points or joints between components are modeled, and rigid elements are used in the joint parts.

  Next, a spot joint element is generated at a joint point or joint of two parts to be joined in the structure model (S3). At this time, the interval between the spot joining elements is made narrower than the interval of normal spot welding, and is arranged densely on the structure model so as to be equal to or less than a predetermined interval.

  Next, analysis conditions for performing optimization analysis are input (S5). The analysis conditions for the optimization analysis include conditions relating to the shape or required characteristics of the structure and conditions relating to the spot joint element to be subjected to the optimization analysis.

  Conditions related to the shape or required characteristics of the structure include, for example, the restraint position of the structure, the position where the load is applied, the material volume ratio, the rigidity is maximized, the displacement is minimized, the stress is minimized, etc. It is done. On the other hand, the conditions relating to the spot joining elements include a condition relating to preprocessing for appropriately performing optimization analysis and a condition relating to the position and number of spot joining elements.

  Next, optimization analysis is performed on the spot joint elements on the structure model under the analysis conditions set in the analysis condition setting step S5, and spot joint elements satisfying the analysis conditions are selected (S7). As an optimization analysis method, topology optimization may be used, or another optimization analysis method may be used.

  Next, all the spot joint elements selected in the optimization analysis step S7 are extracted (S9). The extracted spot joining element includes information such as an identification number of a part joined by the spot joining element and an identification number of an element constituting the part.

  Next, all the component assemblies included in the structure are specified from the information about the component assemblies that the spot joining element has taken out (S11). The identified part set includes information on identification numbers, nodes, etc. of all spot joining elements included in the part set, and these pieces of information are extracted (S13).

  Next, in the distance calculation step between spot joining elements, for each spot joining element included in the part set, the distance between spot joining elements with other spot joining elements included in the same part set as the spot joining element is calculated. (S15)

  Next, the minimum distance between spot bonding elements is selected from the distances between spot bonding elements determined for each spot bonding element, and this is determined as the spot bonding interval of the spot bonding elements (S17).

  It is determined whether or not spot joining elements have been extracted for all parts sets (S19). As a result of the determination, spot joining elements are extracted for all parts sets, and further, spot spots for the spot joining elements are extracted. When the joining interval is determined, a spot joining element having a spot joining interval equal to or smaller than a predetermined value is selected by the continuous joining application site specifying step, and the spot joining element is a site suitable for continuous joining. Then, a new attribute number is assigned to the spot joining element (S21).

  Based on the identification number and attribute number of the spot joining element identified as the site suitable for continuous joining, a command to display the spot joining element on the display device 3 is performed by the continuous joining application site display step, and the structure model And the spot joint element is displayed on the display device 3 (S23).

  In order to confirm the effect of the present invention, in accordance with the procedure shown in the above embodiment, the site suitable for continuous joining was identified in the structure model. This will be described below.

  A vehicle body model 41 shown in FIG. 2 was used as the structure model. The dimensions of the vehicle body targeted by the vehicle body model 41 were steel plates and steel materials having a width of 1200 mm, a length of 3350 mm, a height of 1130 mm, and a thickness of 0.8 mm to 2.0 mm. The reference weight is 125 kg, and the average value of torsional rigidity in the original shape is 25.1 (kN · m / deg). In this embodiment, a steel-based material is used, but there is no problem even if various materials such as aluminum, titanium, magnesium, glass, resin, rubber are used.

  In the vehicle body model 41, spot joint elements 45 are already set for spot welding points applied in the actual vehicle body, and the number of spot joint elements is 3949. As described in the embodiment, when the spot joint element is not set in the vehicle body model, for example, the operator sets the spot joint element 45 by manual input using the input device 5, or the two parts set The spot joining element 45 may be automatically generated from the positional relationship between the component elements spot joining the same place at the joint.

  As an example, spot joining elements are generated so as to be densely arranged on the vehicle body model 41, optimization analysis of spot joining elements by topology analysis and identification of a continuous joining application site are performed.

  As an analysis condition for spot joining elements, Invention Example 1 designates the number of spot joining elements selected in the optimization analysis, while Invention Example 2 maintains in addition to the number of spot joining elements selected in the optimization analysis. The position and number of spot joining elements to be performed were specified. Invention Example 1 is intended for laser joining, and Invention Example 2 is intended for continuous joining by joint use of spot welding and a structural adhesive.

In both the inventive examples 1 and 2, in the generation of the spot joining elements, the spot joining elements are densely arranged by the joining element generation unit 17 in addition to the spot joining elements originally provided in the vehicle body model 41.
Table 1 shows the analysis conditions regarding the position and the number of spot joining elements in the optimization analysis.

  FIG. 9 shows the results of Invention Example 1. In Invention Example 1, FIG. 9A shows spot joining elements 45a (individually independent elements) to be optimized, and the number of spot joining elements to be optimized is 33050. FIG. 9B shows the spot joint elements 45b selected as a result of the optimization analysis, and the number of spot joint elements to be selected is 3949, which is given as an analysis condition. In Invention Example 1, since laser bonding is used, the number of spot bonding elements to be maintained in the analysis is 299 because one fixing point is required for each component assembly. FIG. 9C shows a result of displaying on the vehicle body model 41 spot joining elements 45c having a spot joining interval of 20 mm or less, which is a predetermined value, among spot joining elements 45b selected by performing optimization analysis. It is. The part displayed in FIG. 9C is a part having a close spot joining interval, and the part is a part specified to be preferably applied by continuous joining, that is, laser joining.

  FIG. 10 shows the results of Invention Example 2. FIG. 10A shows spot joining elements 45a (individually independent elements) to be optimized in Invention Example 2, and the number of spot joining elements to be optimized is 18,935. FIG. 10B shows the spot joint elements 45b selected as a result of the optimization analysis, and 600 spot joint elements to be selected are given as analysis conditions. In addition to the number of spot joint elements to be selected, since the joint is spot welding, the number of spot joint elements to be maintained in the analysis is 3949.

  A spot joining interval is obtained for the spot joining element 45b selected by the optimization analysis and the maintained spot joining element, and a spot joining element 45c having a spot joining interval of 20 mm or less which is a predetermined value is set on the vehicle body model 41. The displayed result is shown in FIG. The part displayed in FIG. 10C is specified as a part suitable for continuous joining, that is, joining using spot welding and a structural adhesive in combination.

  In order to further verify the effects of the present invention, after performing optimization analysis according to Invention Examples 1 and 2 under the analysis conditions shown in FIGS. 11 and 12, torsional rigidity analysis and local rigidity analysis are performed, The rigidity improvement effect with respect to the vehicle body model 41 (comparative example) before conducting the optimization analysis was investigated.

  In the torsional rigidity analysis, in the vehicle body model 41 shown in FIG. 11, three places indicated by Δ are constrained, an upward load of 0.5 kN is applied at the position indicated by the arrow, and the torsional rigidity of the vehicle body model 41 is obtained. By changing the place where the load is applied, the load conditions will be 4 in total.

  In the vehicle body model 41 shown in FIG. 12, the local stiffness analysis is performed by constraining the four locations indicated by Δ, and in the BL direction, the WL direction, and the TL direction as indicated by an arrow at one of the 12 portions a to l. A load of 0.5 kN was applied in any one direction, and the local stiffness was obtained from the displacement of the part where the load was applied. By changing the portion (a to l) and the direction (BL, WL, TL) to which the load is applied, the load condition becomes 36 conditions in total.

  Table 2 summarizes the improvement rates of the torsional rigidity and the local rigidity in the vehicle body model 41 to which the continuous joining is applied according to Invention Examples 1 and 2 with respect to the vehicle body model 41 of the comparative example. Here, the rigidity improvement rate is based on each rigidity obtained by the comparative example. Regarding the torsional rigidity, the improvement ratio obtained from the average value of the torsional rigidity analysis results of the four conditions shown in FIG. It is the improvement rate calculated | required from the average value of the local rigidity analysis result of 36 conditions shown in FIG.

The rigidity improvement rate was obtained from the following equation.
Stiffness improvement rate (%) = (Rigidity of inventive example-Rigidity of comparative example) / Rigidity of comparative example x 100

  In both inventive examples 1 and 2, the spot joining elements 45a are arranged densely, and then the optimization analysis of the spot joining elements 45 is performed, so that the torsional rigidity and locality are compared with the case where the optimization analysis of the spot joining elements 45 is not performed. Good results were obtained in which the rigidity was improved by 30% or more.

  In this way, by identifying a part suitable for continuous joining and applying continuous joining to the part, it is possible to achieve greater rigidity improvement than in the case of only spot welding without performing complicated work on the entire structure. Can do.

DESCRIPTION OF SYMBOLS 1 Structure model continuous joining application site identification device 3 Display device 5 Input device 7 Storage device 9 Structure model file 11 Work data memory 13 Arithmetic processing unit 15 Structure model setting unit 17 Spot joint element generation unit 19 Analysis condition setting Unit 21 Optimization Analysis Unit 23 Part Assembly Spot Joining Element Extraction Unit 25 Spot Joining Element Distance Calculation Unit 27 Spot Joining Interval Determination Unit 29 Continuous Joining Application Site Identification Unit 31 Continuous Joining Application Site Display Unit 41 Car Body Model 43 Parts (Car Body Model) 41)
45 Spot Joining Elements (Body Model 41)
45a Spot joint element (body model 41) to be optimized
45b Spot joint element selected by optimization (body model 41)
45c Spot joining element suitable for continuous joining (body model 41)
51 Structure Model 53 Parts (Structure Model 51)
55 Spot Joining Element (Structure Model 51)
55a Pre-set spot joint element 55b Generated spot joint element 55c Selected spot joint element 55d Disappeared spot joint element 55e Spot joint element to be maintained 55f Continuous joint 61 Structure model 63 Parts (structure model 61)
65 Spot joining elements (structure model 61)
67 Representative points of spot joining elements

Claims (8)

A structure model continuous joining application site specifying device for specifying a site suitable for continuous joining with respect to a given analysis condition in a structure model comprising planar elements and / or solid elements constituting a part, ,
A spot joining element generating unit that densely generates a spot joining element having information on a part set of a joining portion with respect to the structure model at predetermined intervals;
An analysis condition setting unit for setting an analysis condition for the structure model;
An optimization analysis unit that selects an optimum spot joining element satisfying the analysis condition set by the analysis condition setting unit from the spot joining elements generated by the spot joining element generation unit;
From the information relating to the part set possessed by the spot joining element selected by the optimization analysis unit, all the part sets included in the structure model are identified, and all of the targets for optimization analysis included in the part set A part assembly spot joint element extraction unit for extracting the spot joint element of each part assembly;
For each spot joint element included in the part set, a spot joint element distance calculation unit that obtains the distance between spot joint elements with other spot joint elements included in the same part set as the spot joint element for each part set;
The minimum distance between spot-bonding elements for each part set is selected from the distance between spot-bonding elements determined for each spot-bonding element by the distance calculation unit between the spot-bonding elements, and this is selected as the spot-bonding interval of the spot-bonding elements. A spot bonding interval determination unit for determining
Of the spot bonding intervals obtained by the spot bonding interval determining unit, a continuous bonding application site specifying unit that specifies a spot bonding element having a spot bonding interval equal to or less than a predetermined value as a site suitable for continuous bonding; An apparatus for identifying a continuous joint application portion of a structure model, comprising:   The continuous bonding application site display unit that visually displays the spot bonding element specified as a site suitable for continuous bonding in the continuous bonding application site specifying unit on a structure model. 2. A continuous joint application site specifying device for the structure model according to 1.   3. The method according to claim 1, wherein, when the continuous bonding is laser bonding, the analysis condition setting unit has a function of designating an optimal number of spot bonding elements to be selected by the optimization analysis unit. Application site identification device for continuous bonding of structural model.   In the case where the continuous joining is a joint using spot welding and a structural adhesive in combination, the analysis condition setting unit determines the position and number of spot joining elements to be maintained as spot welding points in the optimization analysis unit and the structural adhesion. The apparatus for specifying a continuous bonding application site of a structure model according to claim 1 or 2, wherein the device has a function of designating a number of spot bonding elements to be selected as a site to which an agent is applied. A structure model continuous joining application site specifying method for specifying a site suitable for continuous joining with respect to a given analysis condition in a structure model comprising planar elements and / or solid elements constituting a part. The computer performs the following steps:
A spot joining element generating step for densely generating a spot joining element having information on a part set of a joining portion with respect to the structure model at predetermined intervals;
An analysis condition setting step for setting an analysis condition for the structure model;
An optimization analysis step of selecting an optimum spot joining element satisfying the analysis condition set in the analysis condition setting step from the spot joining elements generated in the spot joining element generation step;
From the information relating to the part set possessed by the spot joint element selected in the optimization analysis step, all part sets included in the structure model are identified, and all of the targets for optimization analysis included in the part set A spot joining element extraction step for extracting spot joining elements for each part assembly;
For each spot joint element included in the part set, a spot joint element distance calculation step for obtaining a distance between spot joint elements for each part set with another spot joint element included in the same part set as the spot joint element;
The minimum spot junction element distance for each part set is selected from the spot junction element distances obtained for each spot junction element in the spot junction element distance calculation step, and this is selected as the spot junction interval of the spot junction elements. A step of determining a spot bonding interval to determine
Of the spot bonding intervals obtained in the spot bonding interval determination step, a continuous bonding application site specifying step for specifying a spot bonding element having a spot bonding interval equal to or smaller than a predetermined value as a portion suitable for continuous bonding; A method for specifying a continuous joint application site of a structure model, comprising:   The continuous bonding application site display step of visually displaying the spot bonding element specified as a site suitable for continuous bonding in the continuous bonding application site specifying step on a structure model. 5. A method for identifying a continuous bonding application site of a structure model according to 5.   7. The structure according to claim 5, wherein, in the case where the continuous bonding is laser bonding, the analysis condition setting step designates an optimal number of spot bonding elements selected by the optimization analysis step. A method for identifying the site of continuous joining of models.   In the case where the continuous joining is joint using spot welding and a structural adhesive in combination, the analysis condition setting step includes the position and number of spot joining elements to be maintained as spot welding points in the optimization analysis step and the structural adhesion 7. The continuous bonding application site specifying method for a structure model according to claim 5, wherein the number of spot bonding elements to be selected as a site to which the agent is applied is designated.