JP2013025543A - Optimum division position determination method and device for press molding article comprising multiple components - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for determining an optimum division position in a product configured by joining a plurality of components formed by press-molding a thin plate.SOLUTION: An optimum division position determination method 1 of the present invention is a method of determining an optimum division position in a product configured by joining a plurality of components formed by press-molding a thin plate. A plurality of division position candidates are set within a dividable area of product CAD information, expansion shapes of the respective components in the case of dividing the product by one of the division position candidates are calculated, margin expansion shapes providing a required margin in the expansion shapes are calculated, the minimum plate dimension including the respective margin expansion shapes is calculated, the total material cost of all the components is calculated from the plate dimension or the like, the total material costs are calculated similarly for the other division position candidates, and the division position candidate for minimizing the material cost is determined as the optimum division position.

Description

  The present invention relates to a manufacturing technique of a product formed by joining a plurality of parts formed by press-molding a thin plate, and in particular, when determining the shape of each part constituting the product shape given in advance. The present invention relates to a method and an apparatus for determining a division position of a product.

  Regarding a side part structure constituting a vehicle, there is a structural member in which a front pillar inner and a roof side inner are joined. When designing such a structural member, a state shape in which the respective members are connected is given as a product shape by, for example, CAD data. In this case, the designer decides where to divide the front pillar inner and roof side inner with respect to the product shape in which the front pillar inner and roof side inner are connected, in other words, to what position the front pillar inner is configured. The part to be used is determined, and from which position the roof side inner connected to the part is determined.

The material and thickness of the front pillar inner and roof side inner may differ due to product specifications. For this reason, the position where the product shape is to be divided has a predetermined restriction from the viewpoint of performance, and the area that can be divided is naturally determined.
The actual position in which the product is divided in the determined separable area (hereinafter referred to as “divisible area”) is based on the experience of the designer. is there.

Then, after the division position is determined and the shape is determined for each part, a study for efficiently collecting each part from the material is performed.
With regard to such a method and apparatus for automatically determining sampling of a part by a computer, for example, Patent Document 1 discloses a method of developing an angle steel material on a two-dimensional plane and taking a part on the two-dimensional plane. Has been. Patent Document 2 discloses a method of taking a three-dimensionally shaped part from a workpiece.

JP 2001-109509 A Japanese Patent Laid-Open No. 2003-256011

Conventionally, a designer determines a division position of a product based on his / her experience and the like, and on the premise of the division position, for example, each component is efficiently collected by a method similar to Patent Document 1, for example.
Therefore, even if the cost of the product as a whole is to be reduced, there is a limit because the division position determined by the designer based on experience is assumed.
In the case of a product formed by joining multiple parts formed by press-molding a thin plate, even if the shape of each part constituting this is determined, the area of the plate material constituting each part depends on the developed shape. It is difficult to determine the optimum division position considering the cost from the product shape after press molding. In this sense, it is considered that the optimization in terms of cost is not achieved if the designer determines the division position of the product shape based on his own experience and designs the product based on this.

  The present invention has been made to solve such a problem, and provides a technique for optimizing the division position of the product when determining the shape of each part constituting the product shape given in advance. The purpose is to do.

(1) The optimum division position determination method for a press-formed product composed of a plurality of parts according to the present invention is the optimum division in a product formed by joining a plurality of parts formed by press-molding a thin plate. A method for determining a position,
One of the plurality of division position candidates is a step of reading the product shape CAD information from the CAD information of the product shape, a division position candidate setting step of setting a plurality of product division position candidates in the dividable area in the product CAD information, and Deployment shape calculation step that calculates the unfolded shape for each of the parts that are divided according to the division position when the product is divided, and the allowance for calculating the allowance allowance unfolded shape in which the allowance required for press forming is provided for each unfolded shape The product is configured on the basis of an allowance shape calculation step, a plate material size calculation step for calculating the size of the plate material that includes each margin allowance shape, and the area is minimized, and the price information of the plate material size and the plate material. The total material cost calculation step for calculating the total material cost for all parts and the split shape candidate by changing the division position candidates are combined. A step of repeating each of the steps up to the material cost calculation step, and a division position for selecting the division position at which the total material cost is minimum from the total material cost calculated in the total material cost calculation step and determining it as the optimum division position And a determination step.

(2) Further, in a product constituted by joining a plurality of parts formed by press-molding a thin plate, a method for determining an optimal division position in the product,
When the product shape CAD information is read from the product shape CAD information, the division position candidate setting step for setting the product division position candidates in the dividable area in the product CAD information, and the product is divided by the division position candidates The unfolded shape calculation step for calculating the unfolded shape for each of the parts divided according to the dividing position, and the margin allowance unfolded shape calculating step for calculating the allowance unfolded shape in which the allowance necessary for press forming is provided for each unfolded shape And a plate material size calculation step for calculating the plate material size to include the margin allowance development shape so that the area is minimized, and the total material of all the parts constituting the product based on the plate material size and the price information of the plate material The total material cost calculation step for calculating the cost, and other split position candidates are set and the total material cost calculation step is performed from the expanded shape calculation step. A step of repeating each step up to a step, and a division position determination step of selecting a division position where the total material cost is minimum from the total material cost calculated in the total material cost calculation step and determining it as an optimal division position It is characterized by comprising.

(3) Further, in the above-described (1) or (2), the calculation of the developed shape in the developed shape calculation step is performed by inverse molding analysis.

(4) Moreover, in the thing in any one of said (1) thru | or (3), the said margin allowance deployment shape calculation step performed molding analysis based on the allowance allowance deployment shape, and was obtained by this molding analysis. The method includes a step of adjusting the margin allowance development shape by comparing the shape and the shape of the product shape CAD information.

(5) The optimum division position determination device for a press-formed product composed of a plurality of parts according to the present invention is the optimum division in the product in a product constituted by joining a plurality of parts formed by press-molding a thin plate. An optimum division position determination device for a press-formed product composed of a plurality of parts for determining a position,
A product CAD information storage unit that stores product shape CAD information indicating a product shape, a division position candidate setting unit that sets a product division position candidate within a dividable area in the product CAD information, and a set division position candidate When the product is divided, the unfolded shape calculation processing unit that calculates the unfolded shape for each part divided according to the dividing position, and the allowance allowance unfolded shape in which the allowance margin necessary for press forming is provided for each unfolded shape is calculated. The margin allowance development shape calculation processing section, the plate material dimension calculation processing section for calculating the board material dimensions that include each margin allowance development shape and the area is minimized, and the product based on the board material dimensions and the price information of the board material The total material cost calculation processing unit that calculates the total material cost of all the parts that constitute the component, and the total material cost calculated from the total material cost calculation processing unit is minimized. Is characterized in that a split position determining unit which determines as the optimum dividing position by selecting a split position.

(6) Further, in the above-described (5), the development shape calculation in the development shape calculation processing unit is performed by inverse molding analysis.

(7) Further, in the above-described (5) or (6), the margin allowance development shape calculation processing unit performs a molding analysis based on the margin allowance development shape, and the shape obtained by the molding analysis It has a function of adjusting the margin development shape by comparing the shapes of product shape CAD information.

  According to the optimum division position determination method according to the present invention, in a product configured by joining a plurality of parts formed by press-molding a thin plate, the optimum that can reduce the cost while satisfying the performance aspect of the product The division position can be determined, and a cheaper product can be manufactured.

It is a block diagram of the optimal division | segmentation position determination apparatus in this invention. It is a flowchart which shows the process sequence to which the optimal division | segmentation position determination method in this invention is applied. It is a top view of the product used as the object of the optimal division | segmentation position determination method in this invention. It is the figure which displayed the division position candidate on the top view of the product used as the object of the optimal division position determination method in this invention. It is the figure which divided | segmented the product used as the object of the optimal division | segmentation position determination method in this invention into each component, and showed the expansion | deployment shape of each component. It is explanatory drawing of the method of extract | collecting the margin allowance deployment shape of one component of the product used as the object of the optimal division | segmentation position determination method in this invention from a coil-shaped board | plate material. It is explanatory drawing of the method of extract | collecting the margin allowance development shape of the other components of the product used as the object of the optimal division | segmentation position determination method in this invention from a coil-shaped board | plate material. It is explanatory drawing of the method of extract | collecting the margin allowance development shape of one component of the product used as the object of the optimal division | segmentation position determination method in this invention from a sheet-like board | plate material. It is a table | surface which shows the relationship between the division position candidate in the Example which confirms the effect of this invention, the material cost for every component, a total material cost, etc. FIG. It is a graph which shows the relationship between the division | segmentation position candidate in the Example which confirms the effect of this invention, the material cost for every component, a total material cost, etc. It is a flowchart which shows the process sequence of the other aspect of the optimal division | segmentation position determination method of this invention.

Embodiments of the present invention will be described with reference to the drawings.
First, based on the block diagram shown in FIG. 1, the structure of the optimal division position determination apparatus 1 (hereinafter, simply referred to as “optimal division position determination apparatus 1”) for a press-formed product composed of a plurality of parts will be described.
The optimum division position determination device 1 according to the present embodiment is configured by a PC (personal computer), and includes a display device 3, an input device 5, a storage device 7, a work data memory 9, and an arithmetic processing unit 11.

<Display device>
The display device 3 is used for displaying product CAD information and calculation results, and is composed of, for example, a liquid crystal monitor.

<Input device>
The input device 5 is used to specify a product CAD information file, input a division position candidate, and the like, and includes a keyboard, a mouse, and the like.

<Storage device>
In the storage device 7, at least a product CAD information file 13 and a material unit weight price information file 15 are stored.
The product CAD information file 13 stores, for example, three-dimensional CAD information of a product 41 formed by joining a front pillar inner 43 and a roof side inner 45 which are side structural members of a vehicle as shown in FIG.
The material unit weight price information file 15 stores price information per unit weight of the plate material that is the material of each part.

<Working data memory>
The work data memory 9 has a division position candidate storage area 17 for storing division position candidates, a total material cost storage area 19 for storing total material costs, and a work area 21 for performing calculation processing. Yes.

<Operation processing unit>
The arithmetic processing unit is configured by a CPU of a PC, and each processing unit described below is realized by the CPU executing a predetermined program.
In the arithmetic processing unit 11, a product CAD information reading processing unit 23 that reads product CAD information from the product CAD information file 13, and a plurality of inputs of division position candidates of the product 41 are received from the operator for the product CAD information. A division position candidate input reception processing unit 25, a development shape calculation processing unit 27 that calculates a development shape for each of the parts divided by the division position when the product 41 is divided by one of the division position candidates, and each development A margin allowance development shape calculation processing unit 29 for calculating a margin allowance development shape including a margin allowance in the shape, and a nesting calculation processing unit 31 for calculating a plate material size as a material so as to minimize the area from each margin allowance development shape; , A plate material weight calculation processing unit 33 for calculating a plate material weight from each plate material size, and a material read from each plate material weight and material unit weight price information file 15 Total material cost calculation processing for calculating the total material cost of all the parts constituting the product 41 from the price information per unit weight and storing the total material cost in the total material cost storage area 19 as the total material cost for the division position candidate A total material cost display processing unit 37 that reads the total material cost for the division position candidates stored in the total material cost storage area 19 and displays the total material cost on the display device 3.
Hereinafter, each processing unit in the arithmetic processing unit 11 will be described in more detail.

  The product CAD information reading processing unit 23 displays a product CAD information selection screen on the display device 3 and prompts the operator to specify the product CAD information file 13. When the designation of the product CAD information file 13 is received from the operator, the product CAD information is read from the designated product CAD information file 13 and developed into the work data memory 9, and a three-dimensional CAD drawing is displayed on the display device 3.

  The division position candidate input reception processing unit 25 receives division position candidates input from the operator using the input device 5 and displays them on the three-dimensional CAD drawing displayed on the display device 3. In the product CAD information, an area where the division position can be input in advance at the time of product design (hereinafter referred to as “dividable area”) is set, and the operator divides a plurality of division position candidates into the divisible area It is possible to input the position candidate input reception processing unit 25. As an example, FIG. 4 shows a diagram in which the division position candidates are displayed on the three-dimensional CAD drawing of the product 41. This division position candidate divides the product 41 into left and right parts. In this case, the product 41 is composed of an A part 43 serving as a front pillar inner and a B part 45 serving as a roof side inner. In addition, the division position candidate input reception processing unit 25 stores the division position candidates input from the operator using the input device 5 in the division position candidate storage area 17.

  The developed shape calculation processing unit 27 divides the product 41 into a plurality of parts using one division position among the division position candidates, and calculates a developed shape for each part. The unfolded shape is a minimum two-dimensional shape necessary when press-molding a three-dimensional part from a plate material. As an example, FIG. 5 shows a developed shape 47 of the A component 43 and a developed shape 49 of the B component 45 when the product 41 is divided at the division position candidate b. In the present embodiment, the developed shape is determined by inverse forming analysis, thereby improving the calculation accuracy of the developed shape.

The margin allowance developed shape calculation processing unit 29 calculates a margin allowance developed shape including a margin required for press forming for each developed shape.
When determining the margin allowance development shape, a molding analysis is performed based on the margin allowance development shape obtained by adding the margin allowance to the development shape, and the shape and CAD information obtained after the molding analysis are given as CAD information. If there is a difference in comparison with the original shape, the margin allowance developed shape may be corrected. By doing in this way, the precision of a margin allowance deployment shape can be improved. Here, the molding analysis refers to a numerical analysis method for obtaining a molded product shape when a plate material is press-molded using an elastic-plastic finite element method or the like with molding conditions as input information.

The nesting calculation processing unit 31 calculates a plate material size that is a material of each component from each margin allowance developed shape so that the area is minimized. In press molding, after a press material is collected from a single plate material, the press material is press-molded. At this time, in terms of cost, it is necessary to efficiently collect the press material from one plate material. A so-called nesting process has been conventionally known as a method for efficiently collecting a press material from a single plate material, and this is used in the present invention. Further, the collection of the press material depends on the material input type such as whether the plate material is a coil shape or a sheet shape. Therefore, the nesting calculation processing unit 31 has a nesting calculation information input screen for allowing the operator to input a material input format. The nesting calculation information input screen also asks for the input of a margin that is the distance between the sampling positions of the press material. In other words, the margin refers to the distance between sampling positions of adjacent press materials when sampling a plurality of press materials from a plate material, that is, the distance between the outlines of adjacent press materials.
The nesting calculation processing unit 31 is a plate material that can collect the press material most efficiently from the margin development shape of each part and the material input type and margin input from the operator via the nesting calculation information input screen. Calculate dimensions and yield.

The nesting process will be described by taking as an example a case where the material input format is a coiled plate material, the margin is 15 mm, and the press material of the A component 43 and the B component 45 is collected.
The nesting calculation processing unit 31 calculates the optimum coil width and feed pitch as the plate material dimensions for the above conditions. The feed pitch is a length for feeding a coil when a press material is sampled from a coiled input material by a sampling machine and one press material is sampled and a next press material is sampled.

FIG. 6 shows an example of a sampling method when the press material of the A component 43 is sampled from the coil 51. In FIG. 6, a margin allowance developed shape 48 that is a press material shape of the A component 43 is shown on the coil 51. The acquisition position of the press material of the A component 43 is located on the coiled plate 51 having the coil width W1 with a margin of 15 mm. At this time, the feed pitch is P1.
FIG. 7 shows an example of a sampling method when the press material of the B component 45 is sampled from the coiled plate 53. FIG. 7 shows a margin allowance developed shape 50 which is the shape of a press material for B parts on the coil 53. The acquisition position of the press material of the B component 45 is located on the sheet-like plate 53 having the coil width W2 with a margin of 15 mm. At this time, the feed pitch is P2.

The material used for collecting the press material is not limited to a coil-shaped material, and may be a sheet-shaped material. FIG. 8 shows a method of collecting the press material of the B component 45 using a sheet-like material.
In the example shown in FIG. 8, on the sheet-like plate 55 having the sheet width L1 and the sheet length L2, the margin allowance development shape 50 of the press material of the B component 45 is arranged with a margin of 15 mm.

  The plate material weight calculation processing unit 33 calculates the plate material weight necessary for forming one component from the plate material size, plate thickness, and material density for each component. The weight of the plate material necessary for molding one part is obtained by multiplying the volume of the plate material necessary for molding one component by the material density. Note that the volume of the plate material required for molding one component is obtained by multiplying the coil width, plate thickness, and feed pitch when the material input type is coiled. Further, when the material input form is a sheet, it is obtained by multiplying the sheet width, sheet length, and plate thickness.

  The total material cost calculation processing unit 35 calculates the total material cost when one product 41 is molded, and stores the calculation result in the total material cost storage area 19 as the total material cost for the division position candidates. The total material cost is obtained by multiplying each plate material weight and the price information per unit weight of the material read from the material unit weight price information file 15 to obtain the price for each part, and further, the price of all the parts constituting one product 41 is obtained. It is the total.

  The total material cost display processing unit 37 reads the total material cost for the division position candidates stored in the total material cost storage area 19 and displays it on the display device 3.

  Next, the flow of processing of the optimum division position determination method will be described based on the flowchart shown in FIG. 2 by taking as an example the case of division optimization for the product 41 shown in FIG.

In the product 41, a divisible area surrounded by the division position candidate a and the division position candidate h shown in FIG. Note that the separable area may be set by the operator.
The product 41 is divided into two parts by a division position arbitrarily determined within the separable area, and becomes an A part 43 and a B part 45.
Here, the divisible area will be described.
When the product 41 is composed of an A part 43 and a B part 45, the A part 43 is required to have a higher strength than the B part 45. For example, in FIG. To the left end is unacceptable from the strength of the product 41, and the allowable range of the right end of the A component 43 is determined from the performance aspect of the product 41. As described above, there are restrictions on the division positions in terms of the performance of the product 41, and an area of the division position within the restriction range is referred to as a dividable area.

  First, the product CAD information reading process displays a product CAD information selection screen on the display device 3 and prompts the operator to specify the product CAD information file 13. The operator designates the product CAD information file 13 of the target product 41 using the input device 5 on the product CAD information selection screen. In the product CAD information reading process, the product CAD information is read from the product CAD information file 13 designated by the operator and is developed in the work area 21 of the work data memory 9, and a three-dimensional CAD drawing is displayed on the display device 3 (step S1). ).

  Next, the operator inputs and sets a plurality of division position candidates to the division position candidate input acceptance processing unit 25 using the input device 5. The division position candidate input reception processing unit 25 receives the input division position candidates and displays them on the three-dimensional CAD drawing displayed on the display device 3. The operator confirms whether the input is correct on this display, and corrects or deletes the division position candidate if there is an error. The division position candidate input acceptance processing unit 25 stores the division position candidates in the division position candidate storage area 17 (step S3).

  Next, the developed shape calculation processing unit 27 divides the product 41 into parts based on one of the division position candidates and the product CAD information developed in the work area 21, and calculates a developed shape for each part. The developed shape is stored in the work area 21 (step S5). The calculation of the developed shape is preferably performed by so-called reverse forming analysis. Inverse forming analysis is an analysis method for obtaining a shape that does not include a margin when a formed part shape is developed by numerical analysis.

Next, the margin allowance developed shape calculation processing unit 29 calculates a margin allowance developed shape in which a margin required for molding is added to each developed shape stored in the work area 21, and calculates the allowance allowance developed shape to the work area. 21 (step S7).
The margin setting may be uniquely determined, for example, under predetermined conditions. However, in order to improve the margin accuracy, a process for finely adjusting the margin may be performed by molding analysis. Good. In other words, the molding analysis is performed based on the margin development shape obtained by adding the margin to the developed shape, and the shape after molding obtained by this molding analysis is compared with the original shape given as CAD information. If there is a difference, the margin allowance developed shape is corrected.

Next, the nesting calculation processing unit 31 displays a nesting calculation information input screen on the display device 3. The operator uses the input device 5 to input the material input format and margin for each part to the nesting calculation processing unit 31 (step S9). The nesting calculation processing section 31 calculates the feed pitch from the input information and the margin allowance developed shape stored in the work area 21 if the plate material size, yield, and the input type are coiled (step S11). These calculation results are displayed on the work display device 3 (step S13), and an answer is obtained from the operator whether the calculation results are satisfied (step S15). When the operator confirms the display contents and makes a reply that the calculation result is satisfied by the input device 5, the developed shape calculation processing unit 27 stores the calculation result in the work area 21. If the operator makes a reply that the calculation result is not satisfied, the nesting calculation processing unit 31 performs the processing from step S9 to step 15 again.
Steps S9 to S11 correspond to the embodiment of the plate material size calculation step in the present invention.

  Next, the plate material weight calculation processing unit 33 calculates the plate material weight for each part from each plate material size and material density stored in the work area 21, and stores it in the work area 21 as the plate material weight for each part (step S17). .

Next, the total material cost calculation processing unit 35 calculates the total material cost by adding the plate material weights for each part stored in the work area 21 (step S19), and calculates the total material cost of the entire product 41 for the division position candidates. Is stored in the total material cost storage area 19 (step S21).
Steps S17 to S19 correspond to an embodiment of the total material cost calculation step in the present invention.

  Next, it is determined whether there is an unprocessed division position candidate among the division position candidates input in step S3 (step S23). If there is an unprocessed division position candidate, this division position candidate is determined from step S5. The process up to step S21 is repeated. As a result, the same total material cost as the number of division position candidates is calculated and stored in the total material cost storage area 19 (step S21).

Next, the total material cost display processing unit 37 displays the total material cost of the entire product 41 for all division position candidates stored in the total material cost storage area 19 on the display device 3 (step S25). As a display example, for example, a table showing the relationship between division position candidates and material costs for each part, total material cost, etc. as shown in FIG. 9 may be used, or division position candidates and totals as shown in FIG. It may be a graph showing the relationship between material costs. The contents of FIG. 9 and FIG. 10 will be described in detail in an embodiment described later.
The operator examines the display contents and determines the division position candidate that provides the minimum total material cost as the optimum division position (step S27). It should be noted that an optimum division position may be provided with a division position determination unit that automatically determines the division position that provides the minimum total material cost.

Hereinafter, since the simulation which confirms the effect of this invention was performed, this is demonstrated.
The simulation is a case where the product 41 shown in FIG. 3 is divided into an A component 43 and a B component 45. As a material plate material, the A component 43 is a cold rolled 590 MPa class plate material having a thickness of 1.2 mm, The component 45 was performed under the condition that a cold-rolled 590 MPa grade plate material having a plate thickness of 1.0 mm was used.
The material input format was coiled and the margin was 15 mm. As the division position candidates, eight division position candidates are set as shown in FIG. First, case (a) is set at the rightmost edge of the separable area, and case (b) (left 30 mm), case (c) (left 50 mm), case (d) ( 80mm left, 15 ° tilt, case (e) (110mm left, 20 ° tilt), case (f) (140mm left, 25 ° tilt), case (g) (170mm left, 30 ° tilt) , Case (h) (left side 200 mm, inclination 35 °) was set.

FIG. 9 shows a display of each total material cost calculation result that is processed by the optimum division position determination device 1 for the above conditions and corresponds to the process of step 25 in FIG. In the example of the present invention, the unit price of the cold-rolled 590 MPa class steel plate is α yen / kg for both the plate thickness of 1.0 mm and the plate thickness of 1.2 mm.
Looking at the division position candidate case (a) in FIG. 9, the material cost of the A part 43 is 1.405α yen, the material cost of the B part 45 is 1.622α yen, and the total material cost is 3.027α yen. ing. In the division position candidate case (b) inputted so that the shape of the A component 43 is smaller than the division position candidate case (a), the material cost of the A component 43 is 1.307α yen, and the material cost of the B component 45 is 1. The total material cost is 2.965α yen. Comparing case (a) and case (b), the total material cost per product 41 is 0.062α yen cheaper than case (a) in case (b). This is because the proportion of the A part 43 formed from the plate material that is thicker than the case (a) is smaller in the case (b), and the press material of the A part 43 and the B part 45 is collected in the nesting calculation. It shows that it can be performed well.
Looking at the total material cost for case (c) to case (h) shown in FIG. 9, the total material cost for case (f) is 2.799α, and the case (a) to case (h) It can be seen that it is the cheapest of all the total material costs, and the division position of case (f) is the optimum division position among the division position candidates inputted this time. The operator can determine case (f) as the optimum division position.

FIG. 10 is a graph of the table of FIG. 9, and the vertical axis represents the total material cost (yen). Looking at the graph in Fig. 10, the total material cost decreases as the position candidate is shifted from case (a) to the left, and the total material cost slightly increases from case (f). Can be read. When the graph is approximated by a curve, it can be seen that there may be a division position between case (e) and case (f) such that the total material cost is lower than that of case (f). In such a case, the division position between case (e) and case (f) is input as a new candidate to the optimum division position determination device 1 to be processed, and the total material cost at the division position is obtained to obtain the case. You may make it compare with the total material cost of (f).
In addition, the above-mentioned effect can be confirmed for the unit price of the steel plate even if the A part and the B part are different.

  As shown in the above-described embodiment, the optimum division position determination method 1 is used to perform the optimum division position determination method of the present invention, thereby joining a plurality of parts formed by press-molding a thin plate. In the product, it is possible to determine the optimum division position that can reduce the cost while satisfying the performance requirement, and it is possible to manufacture a cheaper product.

In the above-described embodiments and examples, an example is shown in which the operator inputs a plurality of division position candidates at a time and sequentially calculates the total material cost for the input plurality of division candidates. The total material cost may be calculated each time a division position candidate is input, and the next division position candidate may be input after calculating the total material cost.
FIG. 11 shows a flowchart of the optimum division position determining apparatus in such a case.
In FIG. 11, the same steps as those in FIG. 2 are denoted by the same reference numerals, and the same processing as the steps in FIG. 2 is performed except for steps 31 and 33.
That is, in the flowchart shown in FIG. 11, step 31 is performed instead of step S <b> 3 of the flowchart of FIG. 2, and step 33 is performed instead of step 23.

In step S31, the optimal division position determination device 1 accepts a single division position candidate.
In step S33, the operator is asked whether another division position candidate is to be input. If the operator additionally inputs a division position candidate, the process returns to step S31, and the processes of steps S5 to S33 are performed. If it is determined in step S33 that there is no new input of the division position candidate, the calculation result of each total material cost is expressed as in the flowchart of FIG. 2 (S25).

In the above-described embodiments and examples, the case where there is one separable area has been described as an example, but a plurality of separable areas may be provided. For example, when there are two separable areas, the product is composed of three parts.
In this way, when there are a plurality of divisible areas, when inputting the division position candidates in step S3, a plurality of division position candidates are input for each divisible area, and one division position candidate is selected from each divisible area. The total material cost may be calculated for each set of division position candidates that are selected and combined with the division position candidates selected from all the divisible areas. In this case, the total material cost is calculated as the same number as the number of combinations of division position candidates. That is, the two dividable areas are set as a dividable area a and a dividable area b, respectively, and three division position candidates are set for the divisible area a, and two division position candidates are set for the divisible area b. In this case, there are a total of six combinations of division position candidates, and the total material cost is also calculated correspondingly.

  In the above-described embodiment and examples, the division position candidate input reception processing unit 25 exemplifies a case where the operator inputs and sets a plurality of division position candidates for the divisible area. If an area is set, division position candidates may be automatically set at a predetermined pitch. In this case, the division position candidate input acceptance processing unit 25 is a division position candidate automatic setting processing unit.

DESCRIPTION OF SYMBOLS 1 Optimal division | segmentation position determination apparatus 3 Display apparatus 5 Input apparatus 7 Storage apparatus 9 Work data memory 11 Arithmetic processing part 13 Product CAD information file 15 Material unit weight price information file 17 Division | segmentation position candidate storage area 19 Total material cost storage area 21 Work Area 23 Product CAD information reading processing unit 25 Division position candidate input reception processing unit 27 Unfolding shape calculation processing unit 29 Margin allowance unfolding shape calculation processing unit 31 Nesting calculation processing unit 33 Plate material weight calculation processing unit 35 Total material cost calculation processing unit 37 Total Material cost display processing unit 41 Product 43 A part 45 B part 47 Expanded shape 48 Margin allowance developed shape 49 Expanded shape 50 Margin allowance developed shape 51 Coiled plate 53 Coiled plate 55 Sheet shaped plate W1 Coil width P1 Feed pitch W2 Coil width P2 Feed pitch L1 Sheet width L2 Sheet length

Claims (7)

A method of determining an optimal division position in a product formed by joining a plurality of parts formed by pressing a thin plate,
One of the plurality of division position candidates is a step of reading the product shape CAD information from the CAD information of the product shape, a division position candidate setting step of setting a plurality of product division position candidates in the dividable area in the product CAD information, and Deployment shape calculation step that calculates the unfolded shape for each of the parts that are divided according to the division position when the product is divided, and the allowance for calculating the allowance allowance unfolded shape in which the allowance required for press forming is provided for each unfolded shape The product is configured on the basis of an allowance shape calculation step, a plate material size calculation step for calculating the size of the plate material that includes each margin allowance shape, and the area is minimized, and the price information of the plate material size and the plate material. The total material cost calculation step for calculating the total material cost for all parts and the split shape candidate by changing the division position candidates are combined. A step of repeating each of the steps up to the material cost calculation step, and a division position for selecting the division position at which the total material cost is minimum from the total material cost calculated in the total material cost calculation step and determining it as the optimum division position A method for determining an optimum division position of a press-formed product composed of a plurality of parts. A method of determining an optimal division position in a product formed by joining a plurality of parts formed by pressing a thin plate,
When the product shape CAD information is read from the product shape CAD information, the division position candidate setting step for setting the product division position candidates in the dividable area in the product CAD information, and the product is divided by the division position candidates The unfolded shape calculation step for calculating the unfolded shape for each of the parts divided according to the dividing position, and the margin allowance unfolded shape calculating step for calculating the allowance unfolded shape in which the allowance necessary for press forming is provided for each unfolded shape And a plate material size calculation step for calculating the plate material size to include the margin allowance development shape so that the area is minimized, and the total material of all the parts constituting the product based on the plate material size and the price information of the plate material The total material cost calculation step for calculating the cost, and other split position candidates are set and the total material cost calculation step is performed from the expanded shape calculation step. A step of repeating each step up to a step, and a division position determination step of selecting a division position where the total material cost is minimum from the total material cost calculated in the total material cost calculation step and determining it as an optimal division position A method for determining the optimum division position of a press-formed product comprising a plurality of parts.   The method for determining the optimum division position of a press-formed product made up of a plurality of parts according to claim 1 or 2, wherein the calculation of the developed shape in the developed shape calculation step is performed by reverse forming analysis.   The margin allowance development shape calculation step includes a step of performing molding analysis based on the margin allowance development shape, and adjusting the margin allowance development shape by comparing the shape obtained by the molding analysis with the shape of the product shape CAD information. The optimal division position determination method for a press-formed product comprising a plurality of parts according to any one of claims 1 to 3. In a product configured by joining a plurality of parts formed by press-molding a thin plate, an optimum division position determination device for a press-formed product composed of a plurality of parts for determining an optimum division position in the product,
A product CAD information storage unit that stores product shape CAD information indicating a product shape, a division position candidate setting unit that sets a product division position candidate within a dividable area in the product CAD information, and a set division position candidate When the product is divided, the unfolded shape calculation processing unit that calculates the unfolded shape for each part divided according to the dividing position, and the allowance allowance unfolded shape in which the allowance margin necessary for press forming is provided for each unfolded shape is calculated. The margin allowance development shape calculation processing section, the plate material dimension calculation processing section for calculating the board material dimensions that include each margin allowance development shape and the area is minimized, and the product based on the board material dimensions and the price information of the board material The total material cost calculation processing unit that calculates the total material cost of all the parts that constitute the component, and the total material cost calculated from the total material cost calculation processing unit is minimized. Press-molded product of the best split position determining device comprising a multi-part, characterized in that a split position determining unit which determines as the optimum dividing position by selecting a split position.   6. The optimal division position determination device for a press-formed product made up of a plurality of parts according to claim 5, wherein calculation of the developed shape in the developed shape calculation processing unit is performed by reverse forming analysis.   The margin allowance development shape calculation processing unit performs a molding analysis based on the margin allowance development shape, and compares the shape obtained by the molding analysis with the shape of the product shape CAD information to adjust the margin allowance development shape. The optimal division position determination device for a press-formed product comprising a plurality of parts according to claim 5 or 6.

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