JP2013210910A - Model creation method, program for causing the same to be executed, computer readable recording medium recording the same, and model creation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a model creation method and device, a program recording the model creation method, and a recording medium recording the program, in which accuracy of simulation is improved, and an error in condition setting by an operator is prevented by facilitating creation of a model.SOLUTION: For calculating a property of an assembly screwed in a state where a fastening member is inserted through fitting holes of mutually-overlapping two fastened members; a fastening member model having a plurality of shell elements corresponding to an outer shape of a fastening member is created; two fastened member models each having a plurality of shell elements corresponding to an outer shape of each of the two fastening members are created; and a model of an assembly obtained by assembling the fastening member model and the two fastened member models is created. Sharing setup is performed so that at this time, at an area where the two fastening members overlap, an axial force can be transmitted between mutually opposing shell elements of the two fastened member models which are positioned in an axial force range where an influence of an axial force of the fastening member reaches the two fastened member.

Description

  The present invention relates to a method for creating a model used for calculating the characteristics of an assembly in which two fastened members are fastened by fastening members, a program for causing a computer to execute such a method for creating a model, and The present invention relates to a computer-readable recording medium on which such a program is recorded. The present invention also relates to an apparatus for creating a model used for calculating characteristics of an assembly in which a plurality of fastened members are fastened by fastening members.

  In industrial product development sites, CAE (Computer Aided Engineering), which supports the advance examination of product design, product manufacturing, process design, etc. by utilizing computer technology, is widely used. In CAE, typically, a three-dimensional model corresponding to a product is created using a computer, and simulations such as structural analysis, stress analysis, vibration analysis, impact analysis, and mechanism analysis of the product are performed based on this model. ing. In many of these simulations, a three-dimensional model in which the outer shape of a product is defined by solid elements created using a plurality of shell elements (shell elements) is used. For example, if the product is optimized before the trial production at the initial stage of product development based on the simulation results, a more optimized prototype can be manufactured from the initial stage of product development. Therefore, the development cost of the product can be reduced, the development schedule of the product can be shortened, and the efficiency of the product development can be improved. In particular, in recent years, 3D CAD (Computer Assisted Drafting) software for drafting has become widespread, and using the 3D model created by such software makes it easier to carry out the above simulation. Development efficiency is further advanced.

  As an example of this simulation, a bolt having a head portion, a screw portion, and a cylindrical portion between the head portion and the screw portion is inserted into the mounting holes of the two fastened members that are overlapped with each other. In the case of vibration analysis of an assembly with a fastening member fastened, it corresponds to the bolt model having a plurality of shell elements corresponding to the bolt outer shape (hereinafter referred to as “bolt model”) and the outer shapes of the two fastening members. An assembly model (hereinafter referred to as an “assembly model”) is created by assembling two fastened member models each having a plurality of shell elements (hereinafter referred to as “fastened member model”). When creating a model of this assembly, it is necessary to set complicated conditions for a large number of bolt fastening portions. However, it is difficult to set complicated conditions for the bolt fastening portion, and it is also very complicated to apply this difficult setting to a large number of bolt fastening portions, so that an error in setting the bolt fastening portion by an operator occurs. There's a problem. Therefore, it is required to facilitate the creation of a model including the fastening conditions of such bolt fastening portions.

  As an example of measures against this problem, in Patent Document 1, in the assembly model, the screw part corresponding region of the bolt model is formed as a cylindrical protruding element having a diameter corresponding to the male screw outer diameter of the screw part, and The screw hole corresponding region of the fastened member model is formed as a cylindrical space having a diameter corresponding to the inner diameter of the female screw. When creating such an assembly model, the cylindrical protrusion element and the cylindrical shape The area where the elements surrounding the space overlap is automatically recognized as a bolt fastening portion composed of a screw portion corresponding region and a screw hole corresponding region. Further, the recognized pull-out strength of the bolt fastening portion is calculated, and then the screw portion corresponding region and the screw hole corresponding region are restrained so as not to change the mutual positional relationship, and the force applied to the bolt fastening portion is The fastening condition of the bolt fastening portion is set so as to release the constraint between the screw portion corresponding region and the screw hole corresponding region when the calculated pullout strength is exceeded.

JP 2008-0665708 A

  However, in Patent Document 1, only the fastening condition of the bolt fastening portion is reproduced by the restraint between the screw portion corresponding region and the screw hole corresponding region, the contact between the bolt head seat surface and the surface of the member to be fastened, The influence of contact between the two fastened members is not fully considered. Therefore, the assembly model created as in Patent Document 1 has a problem that the accuracy of the simulation is lowered.

  The present invention has been made in view of such a situation, and an object of the present invention is to improve the accuracy of simulation, and to facilitate the creation of a model, so that the conditions of fastening of fastening parts by an operator can be improved. To provide a model creation method capable of preventing setting errors, a program for causing a computer to execute such a model creation method, a computer-readable recording medium recording such a program, and a model creation device is there.

  In order to solve the problem, a model creation method according to one aspect of the present invention includes two fastening members each having a head, a screw part, and a cylindrical part between the head part and the screw part. A plurality of shell elements corresponding to the outer shape of the fastening member in order to calculate the characteristics of the assembly in which the two fastened members are screwed by the fastening member in a state of being inserted into the mounting hole of the fastened member; A fastening member model is created, two fastening member models each having a plurality of shell elements respectively corresponding to the outer shapes of the two fastening members are created, and the fastening member model and the two fastening member models are A method of creating a model of the assembled assembly, wherein the shell elements facing each other of the two fastened member models in a region where the two fastened member models overlap, A step of sharing setting so that the axial force of the fastening member can be transmitted, a step of defining an axial force range in which the axial force of the fastening member reaches the two fastened members, and the defined axial force range Detecting the shared shell element located outside, and releasing the shared setting between the detected shell elements.

  In the model creation method according to one aspect of the present invention, the axial force range is surrounded by a boundary extending in a conical shape from the outer periphery of the head seating surface corresponding region of the fastening member model toward the fastened member model side. The conical boundary is inclined at a predetermined angle with respect to the central axis of the fastening member.

  According to another aspect of the present invention, there is provided a model creation method including attaching a fastening member having a head, a screw portion, and a cylindrical portion between the head and the screw portion to each other. A fastening member model having a plurality of shell elements corresponding to the outer shape of the fastening member is created in order to calculate the characteristics of the assembly in which the two fastening members are screwed by the fastening member while being inserted into the hole. Then, two fastened member models each having a plurality of shell elements respectively corresponding to the outer shapes of the two fastened members are prepared, and the fastened member model and the two fastened member models are assembled. And a step of defining a range of an axial force in which an axial force of the fastening member reaches the fastened member, and a region where the two fastened member models overlap each other. Detecting the shell elements facing each other of the two fastened member models positioned within the range of the axial force, and transmitting the axial force of the fastening member between the detected opposing shell elements The axial force range is defined by a boundary extending in a conical shape from the outer periphery of the head seating surface corresponding region of the fastening member model toward the fastened member model side, and the conical shape Is inclined at a predetermined angle with respect to the central axis of the fastening member.

  In the model creation method according to one aspect or another aspect of the present invention, before the sharing setting step, the screw portion corresponding region of the fastening member model is formed into a cylindrical shape having a diameter corresponding to the outer diameter of the male screw. Forming a mounting hole corresponding region formed as a screw hole of the fastened member model into a cylindrical shape having a diameter corresponding to the internal diameter of the female screw; and the fastening member model of the cylindrical portion corresponding region. The method further includes the step of dividing into two in the middle in the longitudinal direction, and the step of matching the diameter of the screw part corresponding region of the two-part fastening member model with the diameter of the attachment hole corresponding region of the fastened member model.

  In order to solve the problem, in one aspect or another aspect of the present invention, a program for causing a computer to execute the above-described model creation method is provided.

  In order to solve the problem, according to one aspect or another aspect of the present invention, a computer-readable recording medium in which the above-described program is recorded is provided.

  In order to solve the problem, a model creation device according to an aspect of the present invention includes two fastening members each having a head, a screw, and a cylindrical member between the head and the screw. A plurality of shell elements corresponding to the outer shape of the fastening member in order to calculate the characteristics of the assembly in which the two fastened members are screwed by the fastening member in a state of being inserted into the mounting hole of the fastened member; A fastening member model is created, two fastening member models each having a plurality of shell elements respectively corresponding to the outer shapes of the two fastening members are created, and the fastening member model and the two fastening member models are An apparatus for creating a model of the assembled assembly, between the shell elements facing each other of the two fastened member models in an area where the two fastened member models overlap, The sharing means for sharing the axial force of the fastening member, the axial force defining means for defining the axial force range in which the axial force of the fastening member reaches the two fastened members, and the axial force Detecting means for detecting the shell element set to be shared located outside the axial force range defined by the defining means; and releasing means for releasing the sharing setting between the shell elements detected by the detecting means. .

  In the model creation device according to an aspect of the present invention, the axial force defining means may have the axial force range conical from the outer periphery of the head seating surface corresponding region of the fastening member model toward the fastened member model side. The conical boundary is inclined at a predetermined angle with respect to the central axis of the fastening member.

  According to another aspect of the present invention, there is provided a model creating apparatus, wherein a fastening member having a head, a screw portion, and a cylindrical portion between the head and the screw portion is attached to two fastening members that overlap each other. A fastening member model having a plurality of shell elements corresponding to the outer shape of the fastening member is created in order to calculate the characteristics of the assembly in which the two fastening members are screwed by the fastening member while being inserted into the hole. Then, two fastened member models each having a plurality of shell elements respectively corresponding to the outer shapes of the two fastened members are prepared, and the fastened member model and the two fastened member models are assembled. In the region where the axial force defining means for defining the axial force range in which the axial force of the fastening member reaches the two fastened members and the two fastened member models overlap with each other Previous Detecting means for detecting mutually opposing shell elements of the two fastened member models located within the axial force range defined by the axial force defining means; and between the shell elements detected by the detecting means, Sharing means for setting to share the axial force so that the axial force can be transmitted, and the axial force defining means determines the axial force range from the outer periphery of the head seating surface corresponding region of the fastening member model. The conical shape is defined by a boundary extending in a conical shape toward the side, and the conical boundary is inclined at a predetermined angle with respect to the central axis of the fastening member.

  In the model creation device according to one aspect or another aspect of the present invention, the screw portion corresponding region of the fastening member model is formed into a cylindrical shape having a diameter corresponding to the outer diameter of the male screw before the step of sharing setting. And a shape changing means for forming a mounting hole corresponding region formed as a screw hole of the fastened member model into a columnar shape having a diameter corresponding to a female screw inner diameter, and the fastening member model corresponding to the cylindrical portion Dividing means for dividing the region into two in the middle in the longitudinal direction of the region; diameter adjusting means for matching the diameter of the region corresponding to the threaded portion of the two divided fastening member model and the diameter of the region corresponding to the mounting hole of the fastened member model; Is further provided.

  According to the present invention, the following effects can be obtained. In the model creation method according to one aspect of the present invention, a fastening member having a head portion, a screw portion, and a cylindrical portion between the head portion and the screw portion is attached to mounting holes of two fastening members that overlap each other. In order to calculate the characteristics of the assembly in which the two fastened members are screwed by the fastening member in the inserted state, a fastening member model having a plurality of shell elements corresponding to the outer shape of the fastening member is created. A model of the assembly in which two fastened member models each having a plurality of shell elements respectively corresponding to the outer shapes of the two fastened members are created, and the fastened member model and the two fastened member models are assembled. The axial force of the fastening member is transmitted between the shell elements facing each other in the two fastened member models in a region where the two fastened member models overlap. A shared setting so as to enable, a step of defining an axial force range in which the axial force of the fastening member reaches the two fastened members, and the shared setting positioned outside the defined axial force range. And detecting a sharing setting between the detected shell elements. The axial force range is surrounded by a boundary extending in a conical shape from the outer periphery of the head seating surface corresponding region of the fastening member model toward the fastened member model, and the conical boundary is It is inclined at a predetermined angle with respect to the central axis of the fastening member. According to another aspect of the present invention, there is provided a model creation method including attaching a fastening member having a head, a screw portion, and a cylindrical portion between the head and the screw portion to each other. A fastening member model having a plurality of shell elements corresponding to the outer shape of the fastening member is created in order to calculate the characteristics of the assembly in which the two fastening members are screwed by the fastening member while being inserted into the hole. Then, two fastened member models each having a plurality of shell elements respectively corresponding to the outer shapes of the two fastened members are prepared, and the fastened member model and the two fastened member models are assembled. And a step of defining a range of an axial force in which an axial force of the fastening member reaches the fastened member, and a region where the two fastened member models overlap each other. Detecting the shell elements facing each other of the two fastened member models positioned within the range of the axial force, and transmitting the axial force of the fastening member between the detected opposing shell elements The axial force range is defined by a boundary extending in a conical shape from the outer periphery of the head seating surface corresponding region of the fastening member model toward the fastened member model side, and the conical shape Is inclined at a predetermined angle with respect to the central axis of the fastening member. Therefore, since the characteristics of the assembly are calculated in consideration of the axial force of the fastening member and the contact between the two fastened members, the accuracy of the simulation can be improved. In particular, since the axial force range is easily reproduced by the conical boundary, it is possible to prevent an operator from setting errors in the fastening conditions.

  In the model creation method according to one aspect or another aspect of the present invention, before the sharing setting step, the screw portion corresponding region of the fastening member model is formed into a cylindrical shape having a diameter corresponding to the outer diameter of the male screw. Forming a mounting hole corresponding region formed as a screw hole of the fastened member model into a cylindrical shape having a diameter corresponding to the internal diameter of the female screw; and the fastening member model of the cylindrical portion corresponding region. The method further includes a step of dividing into two in the middle in the longitudinal direction, and a step of matching a diameter of the screw part corresponding region of the two-part fastening member model with a diameter of the attachment hole corresponding region of the fastened member model. The model is created by redefining the shell elements with the diameter of the screw part corresponding region of the fastening member adjusted only within a limited range on the screw part corresponding region side of the two-part fastening member model. Work can be simplified. Moreover, since the screwing of the screw part of the fastening member and the screw hole of the fastened member can be defined in the same way as the shared setting between the two fastened members, the fastening condition of the fastening part can be easily reproduced, and the operator can It is possible to easily prevent setting errors in the fastening conditions.

  In one aspect or another aspect of the present invention, a program for causing a computer to execute the above-described model creation method is provided. In one aspect or another aspect of the present invention, a computer-readable recording medium in which the above-described program is recorded is provided. For this reason, the above-described model creation method can be automated to reliably prevent an operator from setting errors in the fastening conditions.

  Furthermore, the model creation device according to an aspect of the present invention is a method of attaching two fastening members that overlap a fastening member having a head, a screw part, and a cylindrical part between the head part and the screw part. A fastening member model having a plurality of shell elements corresponding to the outer shape of the fastening member is created in order to calculate the characteristics of the assembly in which the two fastening members are screwed by the fastening member while being inserted into the hole. Then, two fastened member models each having a plurality of shell elements respectively corresponding to the outer shapes of the two fastened members are prepared, and the fastened member model and the two fastened member models are assembled. An apparatus for creating a model of the fastening member between the shell elements facing each other in the two fastened member models in a region where the two fastened member models overlap. Defined by the sharing means for setting the force so that the force can be transmitted, the axial force defining means for defining the axial force range in which the axial force of the fastening member reaches the two fastened members, and the axial force defining means. Detecting means for detecting the shared shell element positioned outside the axial force range, and releasing means for canceling the shared setting between the shell elements detected by the detecting means. Further, the axial force defining means is configured to define the axial force range by a boundary extending in a conical shape from the outer periphery of the head seating surface corresponding region of the fastening member model toward the fastened member model. The conical boundary is inclined at a predetermined angle with respect to the central axis of the fastening member. According to another aspect of the present invention, there is provided a model creating apparatus, wherein a fastening member having a head, a screw portion, and a cylindrical portion between the head and the screw portion is attached to two fastening members that overlap each other. A fastening member model having a plurality of shell elements corresponding to the outer shape of the fastening member is created in order to calculate the characteristics of the assembly in which the two fastening members are screwed by the fastening member while being inserted into the hole. Then, two fastened member models each having a plurality of shell elements respectively corresponding to the outer shapes of the two fastened members are prepared, and the fastened member model and the two fastened member models are assembled. In the region where the axial force defining means for defining the axial force range in which the axial force of the fastening member reaches the two fastened members and the two fastened member models overlap with each other Previous Detecting means for detecting mutually opposing shell elements of the two fastened member models located within the axial force range defined by the axial force defining means; and between the shell elements detected by the detecting means, Sharing means for setting to share the axial force so that the axial force can be transmitted, and the axial force defining means determines the axial force range from the outer periphery of the head seating surface corresponding region of the fastening member model. The conical shape is defined by a boundary extending in a conical shape toward the side, and the conical boundary is inclined at a predetermined angle with respect to the central axis of the fastening member. Therefore, since the characteristics of the assembly are calculated in consideration of the axial force of the fastening member and the contact between the two fastened members, the accuracy of the simulation can be improved. In particular, the axial force range is easily reproduced by the conical boundary, and the fastening condition of the fastening portion is automatically set based on the axial force range, so that an erroneous setting of the fastening condition by the operator can be prevented. .

  In the model creation device according to one aspect or another aspect of the present invention, the screw portion corresponding region of the fastening member model is formed into a cylindrical shape having a diameter corresponding to the outer diameter of the male screw before the step of sharing setting. And a shape changing means for forming a mounting hole corresponding region formed as a screw hole of the fastened member model into a columnar shape having a diameter corresponding to a female screw inner diameter, and the fastening member model corresponding to the cylindrical portion Dividing means for dividing the region into two in the middle in the longitudinal direction of the region; diameter adjusting means for matching the diameter of the region corresponding to the threaded portion of the two divided fastening member model and the diameter of the region corresponding to the mounting hole of the fastened member model; The shell element is redefined with the diameter of the screw part corresponding region of the fastening member adjusted only within a limited range on the screw part corresponding region side of the two-part fastening member model. It is possible to simplify the model of creating work. Moreover, since the screwing of the screw part of the fastening member and the screw hole of the fastened member can be defined in the same way as the shared setting between the two fastened members, the fastening condition of the fastening part can be easily reproduced, and the operator can It is possible to easily prevent setting errors in the fastening conditions.

1 is a block diagram of a model creation device according to a first embodiment of the present invention. (A) It is a side view which shows roughly the volt | bolt used in 1st Embodiment of this invention. (B) It is a bottom view which shows roughly the volt | bolt used in 1st Embodiment of this invention. (A) It is a side view of the model of the volt | bolt used in 1st Embodiment of this invention. (B) It is a bottom view of the model of the volt | bolt used in 1st Embodiment of this invention. (A) It is a top view which shows roughly the 1st to-be-fastened member used in 1st Embodiment of this invention. (B) It is sectional drawing which shows schematically the 1st to-be-fastened member used in 1st Embodiment of this invention cut | disconnected along the AA line of Fig.4 (a). (A) It is a top view of the model of the 1st to-be-fastened member used in 1st Embodiment of this invention. (B) It is sectional drawing which shows schematically the model of the 1st to-be-fastened member used in 1st Embodiment of this invention cut | disconnected along the BB line of Fig.5 (a). (A) It is a top view which shows roughly the 2nd to-be-fastened member used in 1st Embodiment of this invention. (B) It is sectional drawing which shows the 2nd to-be-fastened member used in 1st Embodiment of this invention cut | disconnected along CC line of Fig.6 (a), and is shown roughly. (A) It is a top view of the model of the 2nd to-be-fastened member used in 1st Embodiment of this invention. (B) It is sectional drawing which cut | disconnects along the DD line | wire of Fig.7 (a), and shows schematically the model of the 2nd to-be-fastened member used in 1st Embodiment of this invention. (A) It is a top view which shows roughly the assembly which has a volt | bolt used in 1st Embodiment of this invention, a 1st to-be-fastened member, and a 2nd to-be-fastened member. (B) It is sectional drawing which shows roughly the assembly used in 1st Embodiment of this invention along the EE line of Fig.8 (a). (A) The top view which shows schematically the model of the assembly which has the model of the volt | bolt used in 1st Embodiment of this invention, the model of the 1st to-be-fastened member, and the 2nd to-be-fastened member. It is. (B) A cross-sectional view schematically showing an assembly model used in the first embodiment of the present invention, cut along line FF in FIG. 9 (a) in an initial state immediately after assembly and arrangement. It is. The bolt model used in the first embodiment of the present invention, the model of the first member to be fastened, and the model of the assembly including the model of the second member to be fastened are screw holes of the second member to be fastened. FIG. 10 is a diagram schematically showing a cut along the FF line in FIG. 9A in a state where the diameter is changed. It is a flowchart of the model creation method which concerns on 1st Embodiment of this invention. It is a flowchart of the model creation method which concerns on 2nd Embodiment of this invention.

[First Embodiment]
A model creation method according to a first embodiment of the present invention, a program for causing a computer to execute such a model creation method, a computer-readable recording medium in which such a program is recorded, and a model creation device will be described. To do. In the first embodiment, the model is described as being used for vibration analysis.

  The model creation apparatus 1 will be described with reference to FIG. The model creation device 1 is calculated by an input unit 2 that enables input of data related to model creation, a central processing unit 3 that enables calculation processing for creating a model, and a central processing unit 3. A storage unit 4 that can store data, a recording unit 5 that can record data related to model creation, and a display unit 6 that can output the results of calculation processing are provided. The model creation device 1 also includes a recording medium reading device 8 that can read the recording medium 7. A recording device 9 external to the model device 1 is connected to the model device 1 via a network or the like. A program 10 for causing the model creation device 1 to execute the model creation method according to the first embodiment is recorded in the recording unit 5. Note that the program 10 recorded on the recording medium 7 may be read by the recording medium reader 8, and the model creation apparatus 1 may execute the model creation method by the read program 10. Further, the recording device 9 records component data 11 used for creating a model.

  As an example, the input unit 2 may be a keyboard and a mouse. The central processing unit 3 may be a CPU (Central Processing Unit). The storage unit 4 may be a RAM (Random Access Memory) or a hard disk drive. The recording unit 5 may be a hard disk drive. The display unit 6 may be a monitor. The recording medium 7 may be a magnetic tape, a magnetic disk, an optical disk, a magneto-optical disk, a flash memory, or the like. The recording medium reader 8 may be a magnetic tape drive, magnetic disk drive, optical disk drive, magneto-optical disk drive, flash memory drive, or the like. The recording device 9 may be a hard disk drive.

  A model created in the first embodiment will be described with reference to FIGS. Here, a bolt model 31 as shown in FIGS. 3 (a) and 3 (b) is created based on the bolt 21 of the fastening member as shown in FIGS. 2 (a) and 2 (b). . Based on a first fastened member (hereinafter referred to as “first member”) 22 as shown in FIGS. 4A and 4B, FIG. 5A and FIG. Create a first member model 32 as shown. Based on a second member to be fastened (hereinafter referred to as “second member”) 23 as shown in FIGS. 6A and 6B, FIG. 7A and FIG. Create a second member model 33 as shown. Furthermore, based on the assembly 24 in which the bolt 21, the first member 22, and the second member 23 are assembled as shown in FIGS. 8A and 8B, FIG. 9A and FIG. 9 (b) and an assembly model 34 in which the bolt model 31, the first member model 32, and the second member model 33 are assembled as shown in FIG.

  The bolt 21 and the bolt model 31 will be described with reference to FIGS. Referring to FIGS. 2A and 2B, the bolt 21 has a head portion 21a, a screw portion 21b formed in a male screw shape, and a cylindrical shape located between the head portion 21a and the screw portion 21b. And a cylindrical portion 21c. A head seat surface 21d extending in the outer peripheral direction of the bolt 21 from the cylindrical portion 21c is formed on the head portion 21a.

  Referring to FIG. 3A and FIG. 3B, the bolt model 31 corresponding to the bolt 21 is constituted by a plurality of shell elements w <b> 1 corresponding to the outer shape of the bolt 21. These shell elements w1 are formed in a triangular shape or a quadrangular shape. The bolt model 31 includes a head corresponding region 31a corresponding to the head 21a, a screw corresponding region 31b corresponding to the screw portion 21b, a cylindrical corresponding region 31c corresponding to the cylindrical portion 21c, and a head seating surface 21d. And a corresponding seating surface corresponding region 31d. The screw portion corresponding region 31b is formed in a cylindrical shape having a diameter d1 equal to the male screw outer diameter of the screw portion 21b.

  The first member 22 and the first member model 32 will be described with reference to FIGS. 4 and 5. Referring to FIGS. 4A and 4B, the first member 22 has a top surface 22a and a bottom surface 22b opposite to the top surface 22a. The first member 22 has a mounting hole 22c penetrating between the top surface 22a and the bottom surface 22b. The attachment hole 22c is formed larger than the male screw outer diameter of the screw portion 21b of the bolt 21.

  Referring to FIGS. 5A and 5B, the first member model 32 corresponding to the first member 22 is formed by a plurality of shell elements w2 corresponding to the outer shape of the first member 22. It is configured. These shell elements w2 are formed in a square shape. The first member model 32 has a top surface corresponding region 32a corresponding to the top surface 22a, a bottom surface corresponding region 32b corresponding to the bottom surface 22b, and a mounting hole corresponding region 32c corresponding to the mounting hole 22c.

  The 2nd member 23 and the 2nd member model 33 are demonstrated with reference to FIG.6 and FIG.7. Referring to FIGS. 6A and 6B, the second member 23 has a top surface 23a. Further, the second member 23 is formed with a screw hole 23b formed to be recessed from the top surface 23a. The screw hole 23 b is formed in a female screw shape corresponding to the screw portion 21 b of the bolt 21.

  Referring to FIG. 7A and FIG. 7B, the second member model 33 corresponding to the second member 23 is formed by a plurality of shell elements w3 corresponding to the outer shape of the second member 23. It is configured. These shell elements w3 are formed in a square shape. The second member model 33 has a top surface corresponding region 33a corresponding to the top surface 23a and a screw hole corresponding region 33b corresponding to the screw hole 23b. The screw hole corresponding region 33b is formed in a cylindrical shape having a diameter d2 equal to the inner diameter of the female screw of the screw hole 23b.

  The assembly 24 and the assembly model 34 will be described with reference to FIGS. Referring to FIG. 8A and FIG. 8B, the first member 22 and the second member 23 are arranged so as to overlap each other, and the bottom surface 22b of the first member 22 and the second member 23 are arranged. The top surface 23a is in contact with each other. The center of the mounting hole 22c of the first member 22 and the center of the screw hole 23b of the second member 23 are disposed on the bolt axis. In the mounting hole 22 c of the first member 22 and the screw hole 23 b of the second member 23, the screw portion 21 b and the cylindrical portion 21 c of the bolt 21 are directed from the first member 22 to the second member 23. Is inserted. The screw portion 21 b of the bolt 21 is screwed into the screw hole 23 b of the second member 23, and the head seat surface 21 d is in contact with the top surface 22 a of the first member 22.

  9A and 9B, the first member model 32 and the second member model 33 are arranged so as to overlap each other, and the bottom surface corresponding region 32b of the first member model 32 and the first member model 32 are arranged. The top surface corresponding regions 33a of the two member models 33 face each other. The center of the attachment hole corresponding region 32 c of the first member model 32 and the center of the screw hole corresponding region 33 b of the second member model 33 are arranged on the central axis 31 e of the bolt model 31. In the mounting hole corresponding region 32c of the first member model 32 and the screw hole corresponding region 33b of the second member model 33, the screw portion corresponding region 31b and the cylindrical portion corresponding region 31c of the bolt model 31 are the first. The member model 32 is inserted toward the second member model 33. The bearing surface corresponding region 31 d of the bolt model 31 faces the top surface corresponding region 32 a of the first member model 32.

  In an initial state immediately after the bolt model 31, the first member model 32, and the second member model 33 are arranged at the assembly position, as shown in FIGS. 9A and 9B, the bolt model 31 The screw portion corresponding region 31 b is in a state of being overlapped with the peripheral portion of the screw hole corresponding region 33 b of the second member model 33. Therefore, as shown in FIG. 10, the bolt model 31 is divided into two in the middle in the longitudinal direction of the cylindrical portion corresponding region 31c, and on the screw portion corresponding region 31b side of the two divided bolt models 31, The diameter d1 of the screw portion corresponding region 31b is adjusted to a diameter d1 ′ that matches the diameter d2 of the screw hole corresponding region 33b of the second member model 33. After this diameter adjustment, the outer peripheral surface of the screw part corresponding region 31b of the bolt model 31 and the inner peripheral surface of the screw hole corresponding region 33b of the second member model 33 face each other.

  Here, as shown in FIG. 10, the first member model 32 and the second member are inclined at an angle θ with respect to a central axis 31 e extending in the longitudinal direction of the bolt model 31 from the outer periphery of the bearing surface corresponding region 31 d of the bolt model 31. The boundary U extending in a conical shape toward the member model 33 defines a range in which the axial force of the bolt 21 extends, and the shell element w2 and the first shell element w2 in the bottom surface corresponding region 32b of the first member model 32 facing each other. The shell element w3 in the top surface corresponding region 33a of the second member model 33 is set so as to be able to transmit force to each other in the first sharing setting range R1 (indicated by a thick line) surrounded by the boundary U. ing. Further, the shell element w1 of the seating surface corresponding region 31d of the bolt model 31 and the shell element w2 of the top surface corresponding region 32a of the first member model 32 that are opposed to each other are the second shared setting range R2 (indicated by a bold line). ), Sharing settings are made so that forces can be transmitted to each other. The shell element w1 on the outer peripheral surface of the screw part corresponding region 31b of the bolt model 31 and the shell element w3 on the inner peripheral surface of the screw hole corresponding region 33b of the second member model 33 are the third common setting range. R3 (indicated by a bold line) is set to be shared so that forces can be transmitted to each other. Further, the two divided bolt models 31 are also set to share each other in the third sharing setting range R4 (indicated by a bold line). Here, “shared setting” means that a force acting on one of the opposing shell elements is similarly transmitted to the other of the opposing shell elements, and a force acting on the other of the opposing shell elements is one of the opposing shell elements. This means that the condition between the opposing shell elements is set so as to transmit similarly.

  The information about the shape and physical properties of the bolt model 31, the first member model 32, and the second member model 33, the bolt model 31, the first member model 32, and the second member model 33 are assembled into the assembly 34. The position information for assembling in this state, information on the angle θ defining the boundary U of the conical shape for defining the axial force range of the bolt 21 and the like are included in the component data 11 shown in FIG. Further, the angle θ can be determined in advance based on, for example, the characteristics of the bolt 21 obtained from experimental results or the like.

  Here, the model creation method according to the first embodiment will be described. First, operations performed by an operator will be described. The angle θ for the operator to define the axial force range and the shape information, physical properties, and positional information of the bolt 21, the first member 22, and the second member 23 while viewing the display unit 6. Is extracted from the component data 11 recorded in the external recording device 9 and the input unit 2 is operated so as to be sent to the model creation device 1. An operator creates a bolt model 31, a first member model 32, and a second member model 33 based on these information, and the bolt model 31, the first member model 32, and the second member model. The program 10 is started to assemble 33 into the state of the assembly 34.

Next, a model creation method executed by the model creation device 1 based on the program 10 will be described with reference to FIG.
(1) A bolt model 31, a first member model 32, and a second member model 33 are created. (S1)
(2) The screw part corresponding region 31b of the bolt model 31 is formed in a cylindrical shape having a diameter d1 equal to the male screw outer diameter of the screw part 21b of the bolt 21. The screw hole corresponding region 33b of the second member model 33 is formed in a cylindrical shape having a diameter d2 equal to the female screw inner diameter of the screw hole 23b of the second member 23. (S2)
(3) The bolt model 31, the first member model 32, and the second member model 33 are arranged so as to be in the state of the assembly. (S3)
(4) The bolt model 31 is divided into two at the middle in the longitudinal direction of the cylindrical portion corresponding region 31c. (S4)
(5) On the screw portion corresponding region 31b side of the divided bolt model 31, the diameter d1 of the screw portion corresponding region 31b of the bolt model 31 is equal to the diameter d2 of the screw hole corresponding region 33b of the second member model 33. Recreate shell element w1 ′ to adjust to diameter d1 ′. Thereafter, the two divided bolt models are set so as to be able to transmit force to each other. (S5)
(6) Forces are transmitted to all the combinations of the shell element w2 in the bottom surface corresponding region 32b of the first member model 32 and the shell element w3 in the top surface corresponding region 33a of the second member model 33 facing each other. Set sharing as possible. All the combinations of the shell element w1 of the bearing surface corresponding region 31d of the bolt model 31 facing each other and the shell element w2 of the top surface corresponding region 32a of the first member model 32 are shared so that force can be transmitted to each other. Set. All the combinations of the shell element w1 ′ on the outer peripheral surface of the screw part corresponding region 31b of the bolt model 31 and the shell element w3 on the inner peripheral surface of the screw hole corresponding region 33b of the second member model 33 are mutually Set sharing so that force can be transmitted. (S6)
(7) A conical boundary U is defined based on the angle θ with respect to the central axis 31e of the bolt model 31. (S7)
(8) A set of shell elements w2, w3 that are shared between the first member model 32 and the second member model 33 are selected. (S8)
(9) It is determined whether or not the selected set of shell elements w2 and w3 are located within a range surrounded by the boundary U. (S9)
(10) When the set of selected shell elements w2 and w3 are located within the range surrounded by the boundary U (YES), the shared setting between the set of shell elements w2 and w3 is maintained. (S10)
(11) When the selected set of shell elements w2, w3 is not located within the range surrounded by the boundary U (NO), the sharing setting between the set of shell elements w2, w3 is canceled. (S11)
(12) Record that the determined set of shell elements w2, w3 has been determined. (S12)
(13) It is determined whether or not the determination has been performed for all the sets of shell elements w2 and w3 that are shared between the first member model 32 and the second member model 33. (S13)
(14) If determination has been performed for all sets of shell elements w2 and w3 that are set to be shared (YES), the operation ends.
(15) When determination is not performed for all sets of shell elements w2 and w3 that are set to be shared (NO), a set of shell elements w2 and w3 that are not determined is selected. (S14)
(16) It is determined whether or not the selected set of shell elements w2 and w3 are located within a range surrounded by the boundary U. (S9)
The assembly model 34 created in this way is displayed on the display unit 6.

  As described above, according to the first embodiment of the present invention, the assembly is performed in consideration of the axial force of the bolt 21 and the contact between the bottom surface 22b of the first member 22 and the top surface 23a of the second member 23. Since 24 characteristics are calculated, the accuracy of the simulation can be increased. Further, since the axial force range is easily reproduced by the conical boundary U, and the fastening condition of the bolt 21 is automatically set based on the axial force range, it is possible to prevent an erroneous setting of the fastening condition by the operator. Can do.

  According to the first embodiment of the present invention, the shell element w1 ′ is adjusted in a state where the diameter of the screw portion corresponding region 31b is adjusted only in a limited range on the screw portion corresponding region 31b side of the two-divided bolt model 31. Since it is redefined, model creation can be simplified. The screw 21b of the bolt 21 and the screw hole 23b of the second member 23 are screwed together with the shared setting between the bearing surface corresponding region 31d of the bolt model 31 and the top surface corresponding region 32a of the first member model 32, and Since it can be defined similarly to the shared setting between the bottom surface corresponding region 32b of the first member model 32 and the top surface corresponding region 33a of the second member model 33, the fastening condition of the bolt 21 can be easily reproduced, and the fastening condition by the operator Can be easily prevented.

  According to the first embodiment of the present invention, since the model creation apparatus 1 executes the above-described model creation method by the program 10 recorded in the recording unit 5 or the recording medium 7, the above-described model creation method is automated. Thus, it is possible to reliably prevent the setting error of the fastening condition by the operator.

[Second Embodiment]
A model creation method according to a second embodiment of the present invention, a program for causing a computer to execute the model creation method, a computer-readable recording medium on which the program is recorded, and a model creation device will be described below. The second embodiment is basically the same as the first embodiment. Elements similar to those in the first embodiment will be described using the same symbols and names as those in the first embodiment. Here, a configuration different from the first embodiment will be described.

A model creation method executed by the model creation device 1 based on the program 10 in the second embodiment will be described with reference to FIG.
(1) A bolt model 31, a first member model 32, and a second member model 33 are created. (S21)
(2) The screw part corresponding region 31b of the bolt model 31 is formed in a cylindrical shape having a diameter d1 equal to the male screw outer diameter of the screw part 21b of the bolt 21. The screw hole corresponding region 33b of the second member model 33 is formed in a cylindrical shape having a diameter d2 equal to the female screw inner diameter of the screw hole 23b of the second member 23. (S22)
(3) The bolt model 31, the first member model 32, and the second member model 33 are arranged so as to be in the state of the assembly. (S23)
(4) The bolt model 31 is divided into two at the middle in the longitudinal direction of the cylindrical portion corresponding region 31c. (S24)
(5) On the screw portion corresponding region 31b side of the divided bolt model 31, the diameter d1 of the screw portion corresponding region 31b of the bolt model 31 is equal to the diameter d2 of the screw hole corresponding region 33b of the second member model 33. Recreate shell element w1 ′ to adjust to diameter d1 ′. Thereafter, the two divided bolt models are set so as to be able to transmit force to each other. (S25)
(6) Forces can be transmitted to all the combinations of the shell element w1 of the bearing surface corresponding region 31d of the bolt model 31 and the shell element w2 of the top surface corresponding region 32a of the first member model 32 that face each other. Set to share. All the combinations of the shell element w1 ′ on the outer peripheral surface of the screw part corresponding region 31b of the bolt model 31 and the shell element w3 on the inner peripheral surface of the screw hole corresponding region 33b of the second member model 33 are mutually Set sharing so that force can be transmitted. (S26)
(7) A conical boundary U is defined based on the angle θ with respect to the central axis 31e of the bolt model 31. (S27)
(8) A pair of shell elements w2 and w3 facing each other between the first member model 32 and the second member model 33 are selected. (S28)
(9) It is determined whether or not the selected set of shell elements w2 and w3 are located within the range surrounded by the boundary U. (S29)
(10) When the set of selected shell elements w2 and w3 are located within the range surrounded by the boundary U (YES), the setting is shared between the set of shell elements w2 and w3. (S30)
(11) When the selected set of shell elements w2 and w3 are not located within the range surrounded by the boundary U (NO), no sharing is set between the set of shell elements w2 and w3. (S31)
(12) Record that the determined set of shell elements w2, w3 has been determined. (S32)
(13) It is determined whether or not the determination has been performed on all sets of shell elements w2 and w3 that face each other between the first member model 32 and the second member model 33. (S33)
(14) If determination has been performed for all sets of shell elements w2 and w3 (YES), the operation is terminated.
(15) When determination is not performed for all sets of shell elements w2 and w3 (NO), a set of shell elements w2 and w3 that are not determined is selected. (S34)
(16) It is determined whether or not the selected set of shell elements w2 and w3 are located within a range surrounded by the boundary U. (S29)
The assembly model 34 created in this way is displayed on the display unit 6.

  As mentioned above, according to 2nd Embodiment of this invention, the effect similar to 1st Embodiment is acquired.

  Although the embodiments of the present invention have been described so far, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

  For example, as a first modification of the present invention, a screw, a rivet, a fastener, or the like may be used instead of the bolt 21 as the fastening member. The same effect as the embodiment of the present invention can be obtained.

  As a second modification of the present invention, the assembly model 34 may be used for structural analysis, stress analysis, vibration analysis, impact analysis, mechanism analysis, and the like. In this case, the “shared setting” corresponds to structural analysis, stress analysis, vibration analysis, impact analysis, mechanism analysis, and the like so that the axial force of the bolt 21 reaches the first member 22 and the second member 23. It is good to have been established. The same effect as the embodiment of the present invention can be obtained.

  As a third modification of the present invention, the component data 11 may be input from the input unit 2 by an operator. Alternatively, the component data 11 recorded on the recording medium 7 may be read by the recording medium reading device 8 and sent to the model creation device 1. The same effect as the embodiment of the present invention can be obtained.

  As a fourth modification of the present invention, it is preferable that all of the shell elements w1, w2, and w3 are formed in a triangular shape. However, the present invention is not limited to this, and the shell elements w1, w2, and w3 may be formed in any one of polygonal shapes such as a triangular shape, a quadrangular shape, and a pentagonal shape. The same effect as the embodiment of the present invention can be obtained.

DESCRIPTION OF SYMBOLS 1 Model creation apparatus 7 Recording medium 10 Program 11 Parts data 21 Bolt 21a Head 21b Screw part 21c Cylindrical part 21d Head seat surface 22 1st to-be-fastened member (1st member)
22c Attachment hole 23 2nd to-be-fastened member (2nd member)
23b Screw hole 31 Bolt model 31a Head corresponding region 31b Screw portion corresponding region 31c Cylindrical portion corresponding region 31d Seating surface corresponding region 31e Center axis 32 First member model 32c Mounting hole corresponding region 33 Second member model 33b Screw hole corresponding Region U Boundaries w1 to w3, w1 ′ Shell elements R1 to R4 First to fourth shared setting ranges θ Angle d1, d2, d1 ′ Diameter S1 to S14, S21 to S34 Steps

Claims (10)

A fastening member having a head portion, a screw portion, and a cylindrical portion between the head portion and the screw portion is inserted into mounting holes of two fastening members that overlap each other, and the two fastening members In order to calculate the characteristics of the assembly to which the fastened member is screwed, a fastening member model having a plurality of shell elements corresponding to the outer shape of the fastening member is created, and each of the two fastened members corresponds to the outer shape. A method of creating two fastened member models each having a plurality of shell elements and creating a model of the assembly in which the fastened member model and the two fastened member models are assembled,
Sharing the setting so that the axial force of the fastening member can be transmitted between shell elements facing each other in the two fastened member models in a region where the two fastened member models overlap;
Defining an axial force range in which an axial force of the fastening member reaches the two fastened members;
Detecting the shared set shell element located outside the defined axial force range;
Releasing a sharing setting between the detected shell elements. The axial force range is surrounded by a boundary extending in a conical shape from the outer periphery of the head seating surface corresponding region of the fastening member model toward the fastened member model side,
The model creation method according to claim 1, wherein the conical boundary is inclined at a predetermined angle with respect to a central axis of the fastening member. A fastening member having a head portion, a screw portion, and a cylindrical portion between the head portion and the screw portion is inserted into mounting holes of two fastening members that overlap each other, and the two fastening members In order to calculate the characteristics of the assembly to which the fastened member is screwed, a fastening member model having a plurality of shell elements corresponding to the outer shape of the fastening member is created, and each of the two fastened members corresponds to the outer shape. A method of creating two fastened member models each having a plurality of shell elements and creating a model of the assembly in which the fastened member model and the two fastened member models are assembled,
Defining an axial force range in which an axial force of the fastening member reaches the fastened member;
Detecting mutually opposing shell elements of the two fastened member models located within the defined axial force range in a region where the two fastened member models overlap each other;
A shared setting to enable transmission of the axial force of the fastening member between the detected opposing shell elements; and
The axial force range is defined by a boundary extending in a conical shape from an outer periphery of the head seating surface corresponding region of the fastening member model toward the fastened member model, and the conical boundary is a center of the fastening member A model creation method that is inclined with respect to an axis at a predetermined angle. Prior to the common setting step, the screw member corresponding region of the fastening member model is formed in a cylindrical shape having a diameter corresponding to the outer diameter of the male screw, and is formed as a screw hole of the fastened member model Forming the hole corresponding region into a cylindrical shape having a diameter corresponding to the inner diameter of the female screw;
Dividing the fastening member model into two in the middle in the longitudinal direction of the cylindrical portion corresponding region;
4. The method according to claim 1, further comprising: matching a diameter of the screw part corresponding region of the two-part fastening member model with a diameter of the attachment hole corresponding region of the fastened member model. Model creation method.   The program for making a computer perform the model creation method as described in any one of Claims 1-4.   A computer-readable recording medium on which the program according to claim 5 is recorded. A fastening member having a head portion, a screw portion, and a cylindrical portion between the head portion and the screw portion is inserted into mounting holes of two fastening members that overlap each other, and the two fastening members In order to calculate the characteristics of the assembly to which the fastened member is screwed, a fastening member model having a plurality of shell elements corresponding to the outer shape of the fastening member is created, and each of the two fastened members corresponds to the outer shape. An apparatus for creating two fastened member models each having a plurality of shell elements and creating a model of the assembly in which the fastened member model and the two fastened member models are assembled,
A sharing unit configured to share the axial force of the fastening member between the shell elements facing each other in the two fastened member models in a region where the two fastened member models overlap;
An axial force defining means for defining an axial force range in which an axial force of the fastening member reaches the two fastened members;
Detecting means for detecting the shared shell element located outside the axial force range defined by the axial force defining means;
A model creating apparatus comprising: canceling means for canceling sharing setting between shell elements detected by the detecting means.   The axial force defining means is configured to define the axial force range by a boundary extending in a conical shape from an outer periphery of a head seating surface corresponding region of the fastening member model toward the fastening member model; The model creation device according to claim 7, wherein the conical boundary is inclined at a predetermined angle with respect to a central axis of the fastening member. A fastening member having a head portion, a screw portion, and a cylindrical portion between the head portion and the screw portion is inserted into mounting holes of two fastening members that overlap each other, and the two fastening members In order to calculate the characteristics of the assembly to which the fastened member is screwed, a fastening member model having a plurality of shell elements corresponding to the outer shape of the fastening member is created, and each of the two fastened members corresponds to the outer shape. An apparatus for creating two fastened member models each having a plurality of shell elements and creating a model of the assembly in which the fastened member model and the two fastened member models are assembled,
An axial force defining means for defining an axial force range in which an axial force of the fastening member reaches the two fastened members;
Detecting means for detecting mutually opposing shell elements of the two fastened member models located within an axial force range defined by the axial force defining means in a region where the two fastened member models overlap;
A sharing means for setting to share the axial force of the fastening member between the shell elements detected by the detection means,
The axial force defining means is configured to define the axial force range by a boundary extending in a conical shape from an outer periphery of a head seating surface corresponding region of the fastening member model toward the fastening member model; The model creation device, wherein the conical boundary is inclined at a predetermined angle with respect to the central axis of the fastening member. Prior to the common setting step, the screw member corresponding region of the fastening member model is formed in a cylindrical shape having a diameter corresponding to the outer diameter of the male screw, and is formed as a screw hole of the fastened member model A shape changing means for forming the hole corresponding region into a cylindrical shape having a diameter corresponding to the inner diameter of the female screw;
Dividing means for dividing the fastening member model into two at the middle in the longitudinal direction of the cylindrical portion corresponding region;
The diameter adjustment means which makes the diameter of the thread part corresponding | compatible area | region of the said 2 divided fastening member model and the diameter of the attachment hole corresponding | compatible area | region of the said to-be-fastened member model further comprise. The model creation device according to one item.

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