JP3587061B2 - How to determine the unfolding line of press working - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for determining a deployment line in a press process, and more particularly to a technique for determining a development line in a press process more quickly while maintaining the finishing accuracy of a pressed product.
[0002]
[Prior art]
In general, press working is performed in the steps of a drawing step, a punching step (trimming step, cutting step), a bending step, and a release step, and a pressed product as a product is completed. In the punching process, a plate-shaped material is punched along a line using a punching die (for example, a punch and a die). In the bending step, the punched material is fixed and bent into a desired shape by a bending mold or member.
Here, when the material 900 is bent along a substantially straight bending line 902 as shown in FIG. 14, the material 900 expands and contracts (moves) uniformly in almost the entire region. However, when the material 910 is bent along the curved bending line 912 as shown in FIG. 15, the amount of expansion (contraction) changes depending on the curvature. In general, a pressed product has a complicated combination of a linear portion and a curved portion. Therefore, the amount of expansion and contraction may be large or small depending on the shape of the portion to be bent.
During the press working, there is a case where the material is punched out and the pressed product is handled as a product as it is after the bending. In this case, the outer shape of the material after bending must be the target shape. Conventionally, in order to make the outer shape of a material after being bent into a target shape, a geometric calculation is performed from the target shape to obtain a development line. Developed wire extraction is wire extraction obtained by calculating backward from the target shape. By the way, the unfolded line obtained by the geometric calculation does not reflect the plastic deformation characteristics of the material. For this reason, if the material is punched out and bent while the expanded line is drawn, the difference between the outer shape and the target shape of the bent material exceeds the allowable range. Therefore, the unfolding line obtained from skill or experience is corrected, and the corrected unfolding line is determined as the unrolling line for punching.
[0003]
[Problems to be solved by the invention]
However, even when the material is punched and bent by the unfolding wire determined by skill, experience, or the like, the difference between the outer shape of the material after bending and the target shape may exceed an allowable range. That is, in the bending step, if the expansion and contraction of the raw material is increased due to the material of the raw material and the like, or a portion having a large expansion and contraction is formed in the secondary molding, the above difference exceeds the allowable range. In such a case, it is necessary to correct the development line by trial and error while actually performing the press working. In addition, in order to maintain the finishing accuracy of the pressed product, it is necessary to repeatedly perform development and removal of lines until the difference falls within an allowable range. Therefore, considerable labor and time are required to determine the deployment line in the press working (punching step).
[0004]
An example of a related technique is disclosed in Japanese Patent Application Laid-Open No. 8-287294. According to the technology disclosed in this publication, a thickness distribution of a material after press working is obtained by simulation by a finite element method (FEM; Finite Element Method), and a material for performing press working from the thickness distribution is obtained. The thickness is calculated. The use of this technique can reflect the plastic deformation characteristics of the material, but the simulation does not reveal the outer shape of the material after press working. Therefore, it is inevitable to determine the deployment line in the press working by the conventional method.
[0005]
The present invention has been made in view of such a point, and an object of the present invention is to determine a development line in press working more quickly while maintaining the finishing accuracy of a pressed product.
[0006]
[Means for Solving the Problems]
The method for determining the unfolding line of the press working according to claim 1 obtains the outer shape of the material after the press working by a forming simulation based on the finite element method based on the unrolling line and the outer shape of the material after the pressing. The target shape is mapped to the target shape, and the developed line is modified based on the mapped target shape, and the modified line is modified until the difference between the outer shape of the material after pressing and the target shape falls within the allowable range. The outer shape of the material after press working is obtained by the forming simulation by the finite element method based on the target shape, the target shape is mapped to the outer shape of the material after press working, and the development line is drawn based on the mapped target shape. When the correction is made and the difference falls within the allowable range, the corrected development line is determined as the development line for press working.
[0007]
According to the method for determining the unfolding line of the press working according to the first aspect, first, the outer shape of the material after the press working is determined based on the unrolling line. At this time, the development line may be a development line obtained by performing a geometric calculation from the target shape, or may be a development line modified by skill or experience. Next, the target shape is mapped (projected) to the outer shape of the material after the press working. If this mapping is performed on the original expanded line, the outer shape approaches the target shape, so the expanded line is corrected based on the mapped target shape. Then, a predetermined process is repeated until the difference between the outer shape of the material after the press working and the target shape falls within an allowable range. That is, the outer shape of the material after the press working is determined based on the corrected unfolding line, the target shape is mapped, and the unfolding line is corrected. Thus, the finishing accuracy of the pressed product can be maintained by keeping the difference within the allowable range. At this time, the corrected development line is determined as the development line for press working. Therefore, at least the finishing accuracy of the pressed product can be maintained. Further, by reducing (narrowing) the allowable range, it is possible to finish a pressed product with high accuracy.
Further, when obtaining the outer shape of the material after the press working based on the unfolding line, a forming simulation by the finite element method is used. Since the molding simulation and the calculation of the mapping of the target shape are all performed on a computer, trial and error can be easily performed. Further, the above-described predetermined process that is repeatedly performed until the difference between the outer shape of the material after the press working and the target shape falls within an allowable range can be automatically executed on a computer. For this reason, it is possible to determine a deployment line for press working without actually performing press working. Therefore, it is possible to determine the deployment line in press working earlier than before.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Embodiment 1]
First, Embodiment 1 will be described with reference to FIGS. Here, FIG. 1 is a perspective view showing a pressed product as a finished product. FIG. 2 is a sectional view taken along line II-II shown in FIG. FIG. 3 is a flow chart showing the details of the development line extraction processing. FIG. 4 shows expanded lines obtained by a geometric calculation or the like. FIG. 5 is a flowchart showing the contents of the molding simulation. FIG. 6 is a cross-sectional view showing the results of the molding simulation. FIG. 7 is a flowchart showing the content of the reverse mapping process. FIG. 8 shows the mesh of the material after the press working and the target shape. FIG. 9 shows a method of mapping a target shape of a pressed product on a material mesh. FIG. 10 shows a method of correcting unfolded lines. FIG. 11 shows an example of the corrected expanded line.
[0009]
In the first embodiment, a description will be given of the determination of the unfolding line when the production of the press product 10 as shown in FIG. 1 is intended. Here, the pressed product 10 is formed by bending a flat plate punched along a development line along a predetermined bending line. FIG. 2 shows a cross section taken along line II-II of the pressed product 10. As can be seen from FIG. 2, the pressed product 10 has an upper surface 14 and side surfaces 12 and 16. The angle between the upper surface 14 and the side surface 12 is formed substantially at a right angle, and the angle between the upper surface 14 and the side surface 16 is formed at an obtuse angle. That is, it is formed so as to be slightly widened on the side where the press product 10 is opened. With reference to FIG. 3, a description will be given of a procedure for determining the unfolding line in the pressed product 10. FIG.
[0010]
In FIG. 3, first, a development line is provisionally determined [step S10]. The developed line may be used as a developed line obtained by performing a geometric calculation from the target shape, or may be used as modified by skill or experience. For example, a development extraction line 18 as shown in FIG. 4 is provisionally determined. The bending lines 20 and 22 indicate the portions to be bent at a predetermined angle or curvature.
Next, based on the provisionally determined unfolding line, the outer shape of the material after press working is obtained by a forming simulation by the finite element method (step S12). Specific processing contents of the molding simulation will be described with reference to FIG. In addition, when actually performing the molding simulation, it is performed based on the pressing conditions. Pressing conditions often require bending lines 20 and 22, the shape of a press die (die or punch), the material of the material, the mounting position, and the like, in addition to the above-described provisionally determined deployment and extraction.
[0011]
In the forming simulation shown in FIG. 5, since the calculation is performed using the finite element method, the plastic deformation characteristics of the material can be reflected.
First, a simulation of the punching process is performed [Step S22]. When the simulation of the punching process is performed, the outer shape of the material after the punching by the punching press machine is obtained. Thereafter, a simulation of the bending process is performed [Step S24]. When the simulation of the bending process is performed, the outer shape of the material after bending by the bending press machine is obtained. Finally, a simulation of the release process is performed [Step S26]. In actual press working, mold release is performed in each of a punching step and a bending step. However, in the case of performing a simulation with a computer, in order to simplify and speed up the processing, the simulation is performed assuming that the mold is first released after the bending step without performing the simulation corresponding to the release in each step. When the simulation of the release process is performed, the outer shape of the material deformed by the springback after the release is obtained. The outer shape obtained in this way is an outer shape obtained by simulation of the entire press working, and closely approximates the outer shape of the material after the actual press working.
[0012]
For example, when a forming simulation is performed on the unfolded line 18 shown in FIG. 4, a cross-sectional view of the outer shape of the material after press working as shown in FIG. 6 is obtained. Compared to the target shape of the pressed product 10 shown in FIG. 2, in this example, the side surface 12 is longer by the distance D2 and the side surface 16 is shorter by the distance D4.
As described above, the outer shape of the material after press working obtained by executing the forming simulation may be expanded or contracted (displaced) in whole or in part compared to the target shape. Here, when the distances D2 and D4 are within the allowable range, the developed line 18 is determined as the developed line for press working.
[0013]
In the press working including the drawing step, a simulation of the drawing step may be performed before the punching step, if necessary [Step S20]. In the simulation of the drawing process, after placing the material on the drawing press machine, the die is lowered, the outer peripheral portion of the material is sandwiched and fixed by the wrinkle holding surface, and the punch is lowered and the process of drawing is performed. At this time, the calculation is performed on the assumption that members such as a die and a punch are rigid and not deformed. When the simulation of the drawing process is performed in this manner, the outer shape of the material after drawing is obtained.
[0014]
Referring back to FIG. 3, after the outer shape of the material v after the press working is obtained by the forming simulation by the finite element method, the expanded and drawn lines 18 are corrected by the reverse mapping process [step S14]. The specific contents of the reverse mapping process will be described with reference to FIG. Note that the line segment is a straight line, a curve, or a combination thereof arbitrarily.
[0015]
In the inverse mapping process shown in FIG. 7, first, among the outer shapes of the pressed material obtained by executing the forming simulation, an element closest to a point on the target shape is searched for (step S30). Here, FIG. 8 shows an example of the outer shape of the material after the press working. Generally, the outer shape of a material after press working obtained by executing a forming simulation is represented by a mesh. The points P00, P01, P02, P03,..., P10, P11, P12, P13,..., P20, P21, P22,. One element is formed by connecting four points with line segments. In the example of FIG. 8, one element E0 is formed by connecting points P00, P10, P11, and P01 with a straight line, and one element E1 is formed by connecting points P10, P11, P21, and P20 with a straight line. The target shape is formed by connecting a plurality of points with line segments. In the example of FIG. 8, the target shape 24 is configured by connecting points Px0, Px1, Px2,. Then, when searching for the closest element from each point of the target shape, the one with the shortest distance from the center of gravity of each element is selected.
[0016]
Next, the foot (coordinate position) of the perpendicular drawn through the point on the target shape and dropped on the element found in step S30 is obtained [step S32]. In the example shown in FIG. 9, a perpendicular is drawn from the point Px0 on the target shape 24 to the element E1, and the foot of the perpendicular is indicated by the position S0. After that, the parameter of the element on the ruled surface and the element number (ID) are stored [Step S34]. The parameter of the element is a parameter for expressing the foot (position) of the perpendicular obtained in step S32 by the position of a point constituting the element. In the example shown in FIG. 9, if the point P00 and the point P01 are divided by the ratio of u: (1-u), and the point P01 and the point P11 are divided by the ratio of v: (1-v), The position S0 can be represented by the following equation.
[0017]
(Equation 1)
S0 = (1-u) (1-v) P00 + (1-u) vP10 + u (1-v) P01 + uvP11
[0018]
The surface equation shown in the above equation 1 is a bilinear surface composed of points P00, P10, P11, and P01. Therefore, by executing steps S30 and S32, the target shape can be mapped (projected) to the outer shape of the material after the press working.
The steps S30 to S34 are repeatedly executed until the parameters of the elements are obtained and stored together with the element numbers for all the points on the target shape [Step S36]. When the execution is performed in this manner, in the example shown in FIG. 8, the element parameter and the element number for the position S1 are stored in the element E1, and the element parameter and the element number for the position S2 are stored in the element E2.
[0019]
Based on the parameter of the element and the element number stored in the above step S34, the element of the expanded and extracted line is corrected (step S38). Here, FIG. 10 shows an example of the development line 18 before correction. In general, as well as the outer shape of the material after the press working, the developed and drawn lines are also represented by a mesh. In the example of FIG. 10, the grid positions of the mesh are indicated by points Pa0, Pa1, Pa2, Pa3,..., Pb0, Pb1, Pb2, Pb3,. The configuration of the elements is the same as in the case of the outer shape of the material after pressing, and is configured by connecting four points with line segments. Then, for the element corresponding to the element number, a position represented by the parameter of the element is generated by a point. In the example of FIG. 10, a point at the position Sa is generated in the element Ea, a point at the position Sb is generated at the element Eb, and a point at the position Sc is generated at the element Ec. It is assumed that element Ea corresponds to element E0 in FIG. 8, element Eb corresponds to element E1 in FIG. 8, and element Ec corresponds to element E2 in FIG.
[0020]
Then, the above-mentioned step S38 is executed until the calculation is completed for all the elements on the expanded line [step S40]. When the generated points are connected by line segments after the completion of the calculation in this way, a modified expanded line 26 is obtained. An example of the unfolded line 26 is shown by a two-dot chain line in FIG. Note that FIG. 11 also shows the unbroken lines 18 before correction for comparison. In this example, the expanded wire 26 is slightly larger than the expanded wire 18.
[0021]
Returning to FIG. 3 again, after performing the reverse mapping process to correct the developed line, a forming simulation is further performed based on the corrected developed line [step S16]. Since the processing content of the molding simulation has already been described, it is omitted here. When the forming simulation is executed, the outer shape of the material after the press working based on the corrected unfolding line is obtained.
Further, steps S14 and S16 are repeated until an error (difference) between the outer shape of the material after the press working and the target shape falls within an allowable range [step S18]. By this repetitive processing, the outer shape of the material after the press working can be approximated to the target shape. Therefore, even if an appropriate expanded line is provisionally determined in step S10, the expanded line is appropriately corrected by the repetitive processing.
Then, when the error falls within the allowable range, the corrected development line is determined as the development line for press working [step S19]. Since the error is within an allowable range, the finishing accuracy of the pressed product can be maintained.
[0022]
According to the first embodiment, first, the outer shape of the material after the press working is obtained based on the unfolded lines (step S12 shown in FIG. 3). Next, the target shape is mapped to the outer shape of the material after the press working (steps S30 and S32 shown in FIG. 7). If this mapping is performed on the original expanded line, the outer shape approaches the target shape. After that, the developed line is corrected based on the mapped target shape (step S38 shown in FIG. 7). Then, a predetermined process is repeated until the difference between the outer shape of the material after the press working and the target shape falls within an allowable range (step S40 shown in FIG. 7).
That is, the outer shape of the material after press working is obtained based on the corrected unfolding line, the target shape is mapped, and the unfolding line is corrected (steps S14, S16, S18 shown in FIG. 3). Thus, the finishing accuracy of the pressed product can be maintained by keeping the difference within the allowable range. At this time, the corrected development line is determined as the development line for press working (step S19 shown in FIG. 3). Therefore, at least the finishing accuracy of the pressed product can be maintained. Further, by reducing (narrowing) the allowable range, it is possible to finish a pressed product with high accuracy.
[0023]
Further, when obtaining the outer shape of the material after the press working based on the unfolded lines, a forming simulation by the finite element method is used (steps S12 and S16 shown in FIG. 3). Since the molding simulation and the calculation of the mapping of the target shape are all performed on a computer, trial and error can be easily performed. Further, the above-described predetermined process that is repeatedly performed until the difference between the outer shape of the material after the press working and the target shape falls within an allowable range can be automatically executed on a computer. For this reason, it is possible to determine a deployment line for press working without actually performing press working. Therefore, it is possible to determine the deployment line in press working earlier than before.
[0024]
[Embodiment 2]
Next, a second embodiment will be described with reference to FIGS. Here, FIG. 12 is a flowchart showing the contents of the press processing. FIG. 13 is a schematic block diagram showing the configuration of the processing system.
[0025]
In the second embodiment, a description will be given of a processing system for producing the press product 10 shown in FIG.
As shown in the press processing shown in FIG. 12, the procedure of this processing system determines a development line in which the outer shape of the material after the press processing is within an allowable range as compared with the target shape (step S50), and determines. A press die is produced based on the unfolded wire [Step S52], and press working is performed using the produced press die [Step S54].
Here, steps S50 and S52 are performed by a press-type manufacturing system. An example of the configuration of the press die manufacturing system will be described with reference to FIG.
[0026]
The press die manufacturing system shown in FIG. 13 is a system that connects the control unit 100 and the NC processing machine 124 online. The control unit 100 includes a CPU (processor) 110, a ROM 102, a RAM 104, an operation panel 106, a display control circuit 112, a display 114, and a communication control circuit 118.
It should be noted that a general NC processing machine 124 is used, and illustration and description of a specific configuration, operation, and the like are omitted.
[0027]
The CPU 110 controls the entire control unit 100 according to a control program stored in the ROM 102. The ROM 102 uses an EPROM or an EEPROM, and stores character characters to be displayed on the display 114 in addition to the control program. The control program also includes a program for realizing data creation processing and processing execution processing described later. As the RAM 104, a DRAM, an SRAM, a flash memory, or the like is used. The RAM 104 stores data of expanded and extracted lines, data of bent lines, element parameters, element numbers, NC data and other various data, input / output signals, and the like.
In the operation panel 106, an operator gives various commands to the control unit 100, and inputs predetermined data such as unfolded lines and target shape data in accordance with a request from the control unit 100. Note that a pointing device such as a mouse or a digitizer may be connected to the control unit 100 as needed to input the data.
[0028]
The communication control circuit 118 is a circuit for transmitting communication data transmitted from the CPU 110 via the bus 108 to the NC processing machine 124, or receiving communication data transmitted from the NC processing machine 124 and transmitting the communication data to the CPU 110. . The mode of transmitting and receiving data is not limited to wired, but may be wireless.
The display control circuit 112 is a circuit that controls the display of the display 114 according to the display control data sent from the CPU 110 via the bus 108. As the display 114, a liquid crystal display, a plasma display, or the like is used, and the determined unfolding line, the outer shape of the material after press working, the target shape, and the like are displayed.
Each of the above-described components is connected to the bus 108 except for the display unit 114.
[0029]
In the press die manufacturing system configured as described above, the unfolding line determination processing shown in step S50 of FIG. Specific processing contents are the same as those in the first embodiment, and a description thereof will be omitted.
In step S52 of FIG. 12, the data of the expanded line determined in step S50 is stored in the RAM 104, and the data of the expanded line is transmitted to the NC processing machine 124 via the communication control circuit 118. Then, the NC processing machine 124 processes the workpiece by moving the tool in accordance with the received data of the unfolding line. Thus, a press die is manufactured.
[0030]
The press die manufacturing system shown in FIG. 13 manufactures a press die online. Here, in order to manufacture a press die offline, an input / output processing circuit 116 is provided in the control unit 100, and an external storage device 120 or a PTP / PTR (paper tape puncher / reader) 122 is connected to the input / output processing circuit 116.
The input / output processing circuit 116 sends output data received from the CPU 110 via the bus 108 to the external storage device 120 or the PTP / PTR 122. The external storage device 120 includes an HD (hard disk) device, an FD (flexible disk) device, and the like. These devices store NC data and the like on a magnetic disk 126 (for example, a recording medium such as an FD, a magneto-optical disk, or a removable HD). Record. From the PTP / PTR 122, NC data and the like are recorded on the paper tape 128.
After that, the magnetic disk 126 or the paper tape 128 is read by the NC processing machine 124, so that the data of the developed line is sent to the NC processing machine 124. Thus, the work is processed by moving the tool in accordance with the data of the unfolding line, and the press die can be manufactured.
[0031]
Then, in step S54 shown in FIG. 12, if the produced press die is set in a press machine and press-worked, a pressed product can be produced.
[0032]
According to the second embodiment, all operations such as obtaining the outer shape of the material after the press working based on the developed and extracted lines and correcting the developed and extracted lines can be performed by the control unit 100 as a computer. Further, a press die can be easily produced by the NC processing machine 124 based on the determined unfolding line. Further, a pressed product can be produced by the produced press die.
Therefore, it is possible to easily perform trial and error in the control unit 100, and it is possible to determine a development line for producing a press die without actually performing press working. Similarly, it is possible to determine a development line for performing the press working. Therefore, it is possible to determine the deployment and extraction for producing the press die and the development and extraction for performing the press work earlier than before.
[0033]
[Other embodiments]
In the above-described method for determining the unfolding line of the press working, the structure, shape, size, material, number, arrangement, operating conditions, and the like of the other parts are not limited to the above embodiment. For example, each of the following embodiments to which the above embodiment is applied can be implemented.
(1) In the first embodiment, in the reverse mapping process shown in FIG. 7, the target shape is mapped to the outer shape of the material after the press working (steps S30 and S32). Instead of this form, it may be represented by a vector component from a point or element on the outer shape of the material to the target shape. Then, in step S34, the vector component is stored, and in step S38, the expanded and extracted elements may be corrected according to the vector component. Even in this case, the outer shape of the material after press working obtained by executing the forming simulation approaches the target shape and can be kept within an allowable range.
(2) In the first embodiment, in the reverse mapping process shown in FIG. 7, the perpendicular foot is represented by the parameter of the element (step S34). Instead of this form, it may be represented by a vector component from the constituent point of the element to the perpendicular foot. Then, in step S38, the elements of the expanded and extracted lines may be corrected according to the vector components. Even in this case, the outer shape of the material after press working obtained by executing the forming simulation approaches the target shape and can be kept within an allowable range.
[0034]
[Other aspects of the invention]
As described above, the embodiments of the present invention have been described. This embodiment has not only the aspects of the invention described in the claims but also other aspects of the invention. Embodiments of the present invention will be enumerated below, and related explanations will be provided as necessary.
[0035]
[Aspect 1] The outer shape of the material after pressing is determined by a forming simulation based on the finite element method based on the unfolded lines, and the target shape is mapped to the outer shape of the material after pressing, and the mapped target shape is obtained. Based on the corrected unfolding line, and then press-formed by finite element method forming simulation until the difference between the outer shape of the material after pressing and the target shape falls within the allowable range. When the outer shape of the material is obtained, the target shape is mapped to the outer shape of the material after the press working, and the development line is corrected based on the mapped target shape, and the difference falls within the allowable range. And a method for producing a press die based on the determined unfolding line for press working, and determining the corrected unfolding line as unfolding line for press working.
[Related Description of Aspect 1] According to this aspect, the outer shape of the material after the press working is obtained based on the unfolded lines using the forming simulation by the finite element method. The unfolding line is corrected until the difference between the outer shape of the material after the press working and the target shape falls within an allowable range. If a press die is produced based on the determined unfolding line, the finishing accuracy can be maintained. In addition, all operations such as obtaining the outer shape of the material after the press working based on the unrolled lines and correcting the unrolled lines can be performed on a computer. Therefore, it is possible to easily perform trial and error, and it is possible to determine a deployment line for producing a press die without actually performing press working. Therefore, it is possible to determine the deployment line for producing the press die earlier than before.
[0036]
[Aspect 2] The outer shape of the material after press working is determined by a forming simulation based on the finite element method based on the unfolded lines, and the target shape is mapped to the outer shape of the material after press working, and the mapped target shape is obtained. Based on the corrected unfolding line, and then press-formed by finite element method forming simulation until the difference between the outer shape of the material after pressing and the target shape falls within the allowable range. When the outer shape of the material is obtained, the target shape is mapped to the outer shape of the material after the press working, and the development line is corrected based on the mapped target shape, and the difference falls within the allowable range. Press working method in which the corrected unfolding line is determined as unrolling line for press working, a press die is produced based on the determined unrolling line, and press working is performed by the press die. .
[Relevant Description of Aspect 2] According to this aspect, the outer shape of the material after the press working is obtained based on the unfolded lines using the forming simulation by the finite element method. The unfolding line is corrected until the difference between the outer shape of the material after the press working and the target shape falls within an allowable range. If a press die is produced and press-worked on the basis of the unfolding line determined in this way, it is possible to produce a press product maintaining the finishing accuracy. In addition, all operations such as obtaining the outer shape of the material after the press working based on the unrolled lines and correcting the unrolled lines can be performed on a computer. Therefore, it is possible to easily perform trial and error, and it is possible to determine a deployment line for performing press working without actually performing press working. Therefore, it is possible to determine the deployment line for performing the press working earlier than before.
[0037]
【The invention's effect】
Advantageous Effects of Invention According to the present invention, it is possible to more quickly determine unfolded lines in press working while maintaining the finishing accuracy of a pressed product.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a pressed product.
FIG. 2 is a sectional view taken along line II-II shown in FIG.
FIG. 3 is a flowchart showing the details of a deployment extraction line determination process.
FIG. 4 is a diagram showing unfolded lines obtained by a geometric calculation or the like.
FIG. 5 is a flowchart showing the contents of a molding simulation.
FIG. 6 is a cross-sectional view showing a result of performing a molding simulation.
FIG. 7 is a flowchart showing the contents of a reverse mapping process.
FIG. 8 is a diagram showing a mesh of a material after press working and a target shape.
FIG. 9 is a diagram showing a method of mapping a target shape of a pressed product on a material mesh.
FIG. 10 is a diagram showing a method for correcting unfolded lines.
FIG. 11 is a diagram illustrating an example of a modified expanded line;
FIG. 12 is a flowchart showing the contents of a press working process.
FIG. 13 is a schematic block diagram illustrating a configuration of a processing system.
FIG. 14 is a diagram illustrating an example in which a material is bent along a substantially straight bending line.
FIG. 15 is a diagram illustrating an example of bending a material along a curved bending line.
[Explanation of symbols]
10 Pressed products
12,16 side
14 Top
18,22
20 Target shape

Claims (1)

The outer shape of the material after press working is determined by forming simulation by the finite element method based on the unfolding line,
The target shape is mapped to the outer shape of the pressed material,
Correct the unfolding line based on the mapped target shape,
Until the difference between the external shape of the material after pressing and the target shape falls within the allowable range, the external shape of the material after pressing is determined by the forming simulation using the finite element method based on the corrected unfolding lines, and the press The target shape is mapped to the external shape of the material after processing, and the development line is corrected based on the mapped target shape,
When the difference falls within an allowable range, a method for determining the developed and extracted lines in the press working in which the corrected developed and extracted lines are determined as the developed and extracted lines for the press working.

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