JP2002001473A - Shape decision method in preceding process king product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shape decision method capable of easily and quickly obtaining a shape in a preceding process of a press working product. SOLUTION: A plurality of existing press working products similar to new press working products are retrieved by making use of analogous degree from data base non-dimensionalized and a first intermediate shape in the preceding process of the existing press working products is extracted and further, these first intermediate shapes are combined by using a combination method with a weight of the analogous degree. Thereafter, the shape is returned to the original size based on the volume ratio.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for determining the shape of a press-formed product in a previous process from a final shape (or an intermediate shape in an intermediate process) of a press-processed product.

[0002]

2. Description of the Related Art Generally, when a product is manufactured by pressing, the product is pressed by a plurality of pressing steps.

[0003] Conventionally, the intermediate shape in a plurality of pressing steps during the process from a raw material to a product, that is, in a plurality of crushing steps (for example, a flat crushing step, a rough crushing step, etc.) which is an intermediate step, depends on the skill of the product from the shape of the product The decision was made based on the experience and intuition of the engineer. Of course, the same applies to the case where the intermediate shape in the preceding process is further determined from the intermediate shape.

[0004]

However, the task of a skilled technician to find the intermediate shape of the pre-process from the product shape for each pressed product is very troublesome and requires a lot of time. There was a problem of cost.

Accordingly, an object of the present invention is to provide a shape determining method capable of easily and quickly obtaining a shape in a pre-process of a pressed product.

[0006]

Means for Solving the Problems To solve the above-mentioned problems, a first method for determining a shape in a pre-process of a pressed product according to the present invention comprises the steps of: This is a method of determining using the shape of an existing press-processed product and the shape of an article in a process before the process, wherein the shape of the existing press-processed product and the shape of the product in the process before the process are made dimensionless, respectively, in a database. And the dimension of the new press-formed product is made dimensionless. Next, a plurality of existing press-processed products similar to the new press-processed product are searched from the above database, and each of the searched existing presses is searched. Each of the article shapes in the pre-process of the processed product is extracted, and then the plurality of extracted article shapes in the pre-process are synthesized to obtain a synthetic article shape,
Next, while calculating the ratio of the volume of the new pressed product to the volume of the synthetic product shape, the composite product shape is restored to its original size using this ratio, and the existing pressed product similar to the new pressed product is obtained. At the time of searching, while considering each of the rectangular parallelepipeds including these press-formed products, vertical lines are formed from a plurality of positions on a predetermined plane of the rectangular parallelepiped, and both the vertical lines and the corresponding upper and lower mold surfaces for pressing are formed. Find the intersection of the upper surface and the lower surface in the pressed product, search based on the similarity expressed by the total value of the distance between the intersections of the upper surface and the lower surface in both pressed products, Further, when synthesizing the article shapes in the previous process of the plurality of existing pressed products searched based on the similarity, the upper surface of each article shape and the predetermined surface of the rectangular parallelepiped are combined. The total value obtained by adding over each similarity distance to the bottom surface, divided by the total value of the similarity, a method of obtaining the surface shape.

The second method for determining the shape of a pre-processed product of the present invention is a method of determining the shape of a newly-produced press-processed product in the pre-process, the shape of the existing press-processed product and the shape of the existing press-processed product. This is a method of determining using the shape of the article in the previous process, which forms the database by making the shape of the existing pressed product and the shape of the article in the previous process respectively dimensionless, and the shape of the new pressed product. The step of extracting the dimension of the new dimensionless pressed product with a predetermined width, and comparing the predetermined width of the existing pressed product similar to the shape of the extracted portion to be extracted. While searching multiple extracted parts,
A step of extracting the shape of the article in the pre-process of the existing press-processed product of each of the retrieved comparison extracted portions, and synthesizing the shapes of the extracted plurality of comparison-extracted portions in the pre-process to form a composite shape of the extracted portion; The above-mentioned steps comprising the steps to be performed are sequentially performed from one end side to the other end side while sliding at intervals of a predetermined width smaller than a predetermined width for a new press-processed product. Determine the shape of the article, and then determine the ratio of the volume of the new pressed product to the volume of the composite article shape,
With this ratio, the synthetic article shape is restored to its original size,
When searching for an existing pressed product similar to a new pressed product, consider a rectangular parallelepiped having a predetermined width including an extracted portion of both pressed products, and make perpendiculars from a plurality of positions on a predetermined plane of the rectangular parallelepiped. And the intersection of the upper surface and the lower surface of both pressed products corresponding to the upper die surface and the lower die surface for press working, the distance between the intersections of the upper surface and the intersection of the lower surface in both pressed products When searching based on the similarity represented by the total value of the distances between each other, and further combining the shape of each article in the previous process of the comparative extraction part in a plurality of existing pressed products searched based on the similarity By dividing the total value obtained by multiplying the distance from the predetermined plane of the rectangular parallelepiped to the upper surface and the lower surface of each article shape by each similarity, and dividing by the total value of the similarities, the surface shape is obtained. It is a method of finding.

Furthermore, the third method for determining the shape of a pre-processed product of a pressed product according to the present invention comprises the steps of: A method for determining using the shape of the article in the previous step, wherein the article shape obtained by the shape determining method according to the first invention and the article shape obtained by the shape determining method according to the second invention are described. And the surface shape is obtained by combining

According to the method for determining the shape of the first pressed product in the previous step, when the shape of the article in the previous process of the new pressed product is obtained, the existing shape most similar to the shape of the new pressed product is obtained. A plurality of pressed products are searched, and the article shape in the previous process of each of the searched existing pressed products is extracted from a database, and the plurality of extracted shape data is calculated with a value corresponding to the similarity. Thus, since the similarity is obtained by combining them as weights, it is possible to easily, accurately, and quickly obtain the article shape in the previous step of the new pressed product.

Further, according to the shape determination method in the previous step of the second pressed product, the shape of the article in the previous step of the new pressed product having the predetermined shape is determined.
The pressed product is extracted with a predetermined width, and by paying attention to the extracted portion, a process of searching for a plurality of extracted portions of the article shape in the previous process of a similar existing pressed product and synthesizing these is performed from the predetermined width. Since the process is performed at a narrow interval, that is, while sliding the extraction portion, over the entire new pressed product, in addition to the effect of the first invention,
The shape of the article reflecting the characteristics of the details of the new pressed product can be obtained.

Further, according to the method of determining the shape of the third pressed product in the preceding step, the combined method according to the first invention and the slide synthesis method according to the second invention are used together. It is possible to obtain the shape of an article in which the features of the details obtained by the slide synthesis method are added to the shape having the overall characteristics obtained by the batch synthesis method.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for determining a shape in a pre-process of a pressed product according to a first embodiment of the present invention will be described with reference to FIGS.

[0013] The gist of the present invention is that the shape of a new press-formed product to be newly manufactured by a press process in a previous process is defined as follows.
This is a method for determining based on the shape of the existing press-processed product that already exists in the previous process, for example, from the final shape as a product, to the first intermediate shape in the first intermediate process that is the immediately preceding process, and to the first intermediate shape. The second intermediate shape in the second intermediate process, which is the previous process, the third intermediate shape (if necessary, the fourth intermediate shape...) In the third intermediate process, which is the immediately preceding process, and the initial intermediate process This is a method of determining the material shape by calculation using a computer system.

Hereinafter, a method of determining a shape in a pre-process of a pressed product will be described mainly with reference to a flowchart shown in FIG. 1. The gist of the shape determining method of the present invention is, for example, a new pressed product. The final shape (product shape) → the first intermediate shape → the second intermediate shape → the third intermediate shape →... Is to determine the previous shape in each process, that is, the determination of the previous shape in each process. Because the method is the same,
In the following description, a case will be described in which the first intermediate shape in the immediately preceding process of a new press-formed product is obtained.

First, the shapes of a large number of existing pressed products, which are already existing products, and the respective intermediate shapes (for example, the first intermediate shape, the second intermediate shape, the third intermediate shape, etc.) of each of these existing pressed products. ..) And the shape of the material are made dimensionless and stored in a database on a computer system.

In the dimensionless processing, a predetermined reference dimension, for example, "length" is used, and the dimensionless processing is performed so that the total length becomes one. In the database, for example, if a higher-level shape is designated in the process of “final shape → first intermediate shape → second intermediate shape → third intermediate shape →. The structure is such that a lower-level shape is detected.

Next, the final shape of the new pressed product is modeled or three-dimensionally measured by CAD software of a computer system to generate data, and this final shape is also processed in the same manner as in the case of the existing pressed product. Performs dimensionless processing. Of course, for that reference dimension,
It is the same "length" as in the case of existing press-processed products.

Next, a plurality of, for example, three (for example, limited to three) existing press-formed products having a final shape similar to the dimensionless final shape are selected from the database using the similarity. However, for example, two or four or more pieces may be searched), and the data of the first intermediate shape in the preceding process of each of the searched existing pressed products is extracted from the database.

Here, a method of obtaining the similarity between the article to be searched (corresponding to a new pressed product) and the searched article to be searched (existing pressed product) will be described with reference to FIGS.
It will be described based on.

First, as shown in FIG. 2, a rectangular parallelepiped 21 having a side parallel to the length direction x which is a reference dimension of the dimensionless search target article 11 and including the search target article 11 is provided.
And the base (predetermined plane), which is the reference plane of the rectangular parallelepiped 21, is divided into K pieces in the x-axis direction (length direction), and the y-axis direction (width direction) orthogonal to the x-axis direction.
Consider a lattice plane 22 divided into L parts.

Next, a vertical line (perpendicular line) 24 passing through each lattice point 23 on the lattice plane 22 of the rectangular parallelepiped 21 and parallel to the z-axis is considered. Next, each of these vertical lines 24 and the article to be searched 11
, The intersections 25a, 2 with the upper surface 11a and the lower surface 11b corresponding to the upper and lower mold surfaces of the press.
5b are respectively obtained. In addition, this intersection 2
The z-axis coordinate values of 5a and 25b may be obtained in advance if the reference plane is determined.

Next, as shown in FIG. 3, with respect to the retrieval article 12, the same lattice plane 22 of the rectangular parallelepiped 21 as described above is considered.
That is, considering the vertical lines 24 passing through the grid points 23, the respective vertical lines 24 and the upper surface 12 of the search article 12 are considered.
The intersections between a and the lower surface 12b are determined as the z-axis coordinate values of 26a and 26b, respectively.

Next, as shown in FIG. 4, the intersections 25a, 26a, and 25b of the upper surface 11a, 12a and the lower surface 11b, 12b of the article to be searched 11 and the searched article 12 on the vertical line 24 at the same position. Z between 26b
Is the difference between the axial coordinate distance h _ui, calculated for all the vertical line 24 h _li (FIG. 4, in order to facilitate understanding, the upper surface 11a, shows only the distance h _ui of 12a between are), and these distances h _ui, while adding all the absolute values of h _li, predetermined coefficients, also referred to as the modification coefficient (penalty coefficient due for example differences in the difference and the height of the width) multiplying the a and b Thus, the similar basic constant F shown in the following equation (1) is obtained, and the similarity S is obtained based on this similar basic constant F as shown in the following equation (2).

[0024]

(Equation 1) In the above equation (1), Z _sui is the z-axis coordinate value of the i-th grid point on the upper mold surface of the search target component. Z _dui is the z-axis coordinate of the i-th grid point on the upper mold surface of the search component. coordinate value Z _sli is, z-axis coordinate value Z _dli of the i-th grid point of the lower mold surface of the search component, z-axis coordinate value a of the i-th grid point of the lower mold surface of the search components in the width direction The correction coefficient b due to the difference in length indicates the correction coefficient b due to the difference in the length in the height direction. In the above equation (2), K is a standard constant of the similarity. A and b are represented by the following formulas (3) and (4).

[0025]

(Equation 2) In the above formula (3), W _s is the width of the searched component W _d is the width of the searched component In the above formula (4), T _s is the height of the searched component T _d is the height of the searched component , Respectively, and of course, each data in the search target component and the search component has been subjected to dimensionless processing.

Further, in the above formulas (3) and (4),
Q and R are standard constants of the similarity.
A value of 0 is used. When three existing pressed products (first to third search articles) are searched based on the similarity S, the first intermediate shape (article), which is one step before the three existing pressed products, is retrieved. Shape) is extracted from the database.

Then, the three extracted first intermediate shapes are synthesized by a weighting method according to the similarity S, and the first intermediate shape (synthesis) which is one step before the new press-formed product 11 is obtained. (Article shape) is obtained.

For example, z at the intersection of each of the three existing press-formed products (first to third search articles) on the respective vertical lines 24 passing through the respective grid points 23 with the upper surface of each first intermediate shape.
_Assuming that the axis coordinate values are (Z _dui ) ₁ to ₃ , the upper surface position H _dui in the first intermediate shape of the new press-formed product 12 to be synthesized is represented by the following equation (5).

[0029]

(Equation 3) Similarly, the lower surface position H _dli is obtained.

That is, the first intermediate shape of the new pressed product 12 can be obtained. In this way, by synthesizing the first intermediate shapes in the pre-process of the three existing press products similar to the new press product, the first intermediate shapes in the pre-process of the new press product are obtained.
Since this shape data has been made dimensionless, it is necessary to return it to its original size (the same volume as that of a newly pressed product).

That is, the volume restoration coefficient c shown in the following equation (6) is multiplied by the shape data of the new pressed product to obtain a first intermediate shape of the new pressed product having a regular volume. Specifically, each coordinate on the surface of the first intermediate shape is proportionally increased so as to have a volume equivalent to that of the newly pressed product.

C = (V ₀ / V ₁ ) ^1/3 (3) In the expression (6), V ₀ is the volume of the press-processed product before the non-dimensionalization, and V ₁ is the non-dimensional volume. The volume of the stamped product after the conversion is shown below.

As described above, when obtaining the first intermediate shape in the previous step of a new press-formed product having a predetermined shape, a plurality of existing press-processed products (similar to the shape of the new press-processed product) For example, three) are searched, and the first intermediate shapes of the searched existing pressed products are respectively extracted, and the extracted plurality of shape data are determined according to the similarity, that is, the similarity is determined. Since the first intermediate shape in the previous process of the new press-processed product is obtained by batch synthesis using a weighted method with weights, the first intermediate shape is conventionally determined by a skilled engineer based on intuition and experience. It is possible to easily, accurately, and quickly obtain the required value without skill, as compared with the case where it has been used.

Next, a method of determining the shape of the pressed product in the pre-process according to the second embodiment of the present invention will be described with reference to FIGS.
A description will be given based on FIG. In the first embodiment, when searching for an existing pressed product similar to a new pressed product, the entire pressed product is compared. However, in the second embodiment, The parts of the pressed product are compared with each other.

Hereinafter, a method of determining a shape according to the second embodiment will be described with reference to a flowchart shown in FIG. 5, as in the first embodiment, and a step before the new press-processed product will be described. The case where the first intermediate shape is obtained will be described.

First, the shapes of a number of existing press-formed products which are already existing products, and the respective intermediate shapes (eg, the first intermediate shape, the second intermediate shape, the third intermediate shape, etc.) of each of these existing press-processed products. ..) And the shape of the material are made dimensionless and stored in a database on a computer system.

In the dimensionless processing, a predetermined reference dimension, for example, "length" is used, and dimensionless processing is performed so that the total length becomes one. In the database, for example, if a higher-level shape is designated in the process of “final shape → first intermediate shape → second intermediate shape → third intermediate shape →. The structure is such that a lower-level shape is detected.

Next, the final shape of the new pressed product is modeled or three-dimensionally measured by CAD software of a computer system to generate data, and this final shape is also processed similarly to the case of the existing pressed product. Performs dimensionless processing. Of course, for that reference dimension,
It is the same "length" as in the case of existing press-processed products.

Next, as shown in FIG. 6, a part of the new press-formed product 31 of the dimensionless final shape is extracted by a virtual rectangular parallelepiped comparison unit 32 indicating a comparison range of a predetermined width B. As shown in FIG. 7, a part of each existing pressed product 41 is extracted by a virtual comparison unit 42 having the same predetermined width B as shown in FIG.
Ask for. The extraction part 33 and the comparison extraction part 43
Are new press-processed products 31 and existing press-processed products 4
With respect to 1, with respect to the virtual comparison unit 32 at a certain position, the virtual comparison unit 42 extends from one end to the other end at predetermined intervals smaller than the predetermined width B, specifically, for example, at a width of B / 3. By sliding, a plurality of pieces are obtained for all the existing press-formed products 41.

Next, the virtual comparison unit 32 moves to the next position, and similarly, the virtual comparison unit 42 is slid from one end to the other end, and a plurality of comparison extraction parts 43 are obtained. .

Next, the similarity between the extracted portion 33 at a certain position and each of the comparison extracted portions 43 is calculated, and a plurality of, for example, three (eg, three) which are most similar from the database are obtained. The comparison extraction part 43 is not limited, and may be, for example, two or four or more).

The method of obtaining the similarity between the article to be searched (corresponding to the extracted portion of the newly pressed product) and the search object to be searched (corresponding to the comparative extracted portion of the existing pressed product) is described above. Since it is the same as the first embodiment, the description is omitted.

When the comparison extraction portion 43 of the three existing pressed products (first to third search articles) is searched based on the similarity, the preceding process of the three existing pressed products 41 is performed. The article shape of the portion corresponding to the comparison extraction portion 43 of the first intermediate shape (article shape) is extracted from the database.

As the extracted data of the article shape having the predetermined width B, 1/3 of the data at the center is used.
The data on both sides is discarded. Next, these three extracted first intermediate shapes are synthesized by the weighting method according to the similarity, and the new pressed product 31 is formed.
A shape (extracted portion composite shape) corresponding to the extracted portion of the first intermediate shape, which is one step before, is obtained.

Note that the synthesizing is performed in the same manner as in the first embodiment, and the description thereof is omitted. The above-described series of steps (steps) of extraction, search, and synthesis are sequentially performed from one end of the new press-formed product 31 to the other end thereof at an interval of B / 3, and a new press process is performed. A first intermediate shape (synthetic article shape) of the pre-process of the processed product 31 is obtained.

Since the shape data of the first intermediate shape obtained above is dimensionless, the original size, that is, a new press-processed product, is also obtained in the same procedure as in the first embodiment. Returned to equivalent volume.

As described above, when obtaining the first intermediate shape in the previous process of the new press-formed product having the predetermined shape, the new press-processed product is extracted with a predetermined width, and the extracted portion is focused on. The process of retrieving a plurality of extracted portions of the first intermediate shape, which is a pre-process of a similar existing press-formed product, and synthesizing them is performed at an interval smaller than a predetermined width, that is, while sliding the extracted portion which is a comparison portion Since it is performed over the entire new press-formed product, the same effect as that of the first embodiment is obtained, that is, as compared with the case where a skilled engineer determines the first intermediate shape based on intuition and experience. In addition to the effect that it can be easily, accurately and quickly obtained without the need for skill, it is possible to obtain the first intermediate shape reflecting the characteristics of the details of the new pressed product. That.

Next, a description will be given of a method for determining the shape of a press-formed product in a previous step according to the third embodiment of the present invention. The method for determining the shape of the pressed product in the pre-process according to the third embodiment includes the method for determining the shape of the pressed product in the pre-process according to the first embodiment and the method for determining the shape in the pre-process according to the second embodiment. This is a combination of a method for determining the shape of a press-processed product in a previous process.

That is, the first intermediate shape (article shape) obtained by the batch synthesis method described in the first embodiment.
And the first intermediate shape (synthetic article shape) obtained by the slide synthesizing method described in the second embodiment, thereby synthesizing the first intermediate shape (article shape) in the previous step of the new press-formed product. (Shape) is obtained by a hybrid synthesis method.

The method of synthesizing the two intermediate shapes is performed by adding the height coordinates of the upper surface of the first intermediate shape obtained in both embodiments and dividing the sum by two.
The height of the upper surface of the article according to the first intermediate shape according to the embodiment is determined. Of course, the height of the lower surface is similarly obtained.

As described above, the present hybrid synthesis method uses the batch synthesis method and the slide synthesis method together to obtain a shape (inherited) having overall (macroscopic) characteristics obtained by the batch synthesis method. It is possible to obtain a first intermediate shape in the previous step, to which details (microscopic) features obtained by the slide synthesis method are added.

In the above description, the case where the first intermediate shape in the immediately preceding process is determined from the new press-processed product has been described, but, of course, the first intermediate shape is converted to the second intermediate shape by the same shape determination method as described above. The intermediate shape is the third intermediate shape from the second intermediate shape to the third intermediate shape (if necessary,
From the 4th intermediate shape ...)
You can ask.

That is, anyone can easily, accurately, and quickly obtain the shapes in all the intermediate steps including the initial steps (material shapes) using the computer system.

In the above embodiment, "length" is used as a reference dimension for making an article non-dimensional, but a dimension suitable for the shape, for example, a diameter may be used. By the way, as shown in FIG. 8, when sequentially obtaining a first intermediate shape, a second intermediate shape,. ), Slide synthesis method (indicated by number 2)
And the hybrid synthesis method (indicated by the number 3), each of three types is obtained, and if each of these intermediate shapes is selected to have a shape most similar to the expected intermediate shape of the new press-processed product, a selection without leakage is obtained. That is, the shape can be selected with high accuracy.

[0055]

According to the first method for determining the shape of a pressed product in the previous step of the present invention, when the article shape (including the initial product shape) in the previous process of the new pressed product is determined, A plurality of existing pressed products most similar to the shape of the new pressed product are searched, and the article shape in the previous process of each of the searched existing pressed products is extracted from a database. Is obtained by combining the shape data with a value corresponding to the similarity, that is, by combining the similarity as a weight. It can be obtained easily, accurately and quickly without resort.

Further, according to the second method for determining a shape of a press-processed product in a pre-process of the present invention, when determining the shape of an article in a previous process of a new press-processed product having a predetermined shape, Is extracted with a predetermined width, and by paying attention to this extracted portion, a process of searching for a plurality of extracted portions of the article shape in the previous process of a similar existing pressed product and synthesizing them is performed at intervals smaller than the predetermined width. In other words, while the extracted portion is slid, it is performed over the entire new pressed product to obtain an extracted portion composite shape. In addition to the effects of the first invention, the features of the details of the new pressed product are reflected. The shape of the finished article can be determined.

Further, according to the third aspect of the present invention, the method for determining the shape of the pre-processed product in the preceding step is to use both the batch synthesizing method according to the first invention and the slide synthesizing method according to the second invention. Thus, it is possible to obtain the shape of the article in which the details obtained by the slide synthesis method are added to the shape having the overall characteristics obtained by the batch synthesis method, and therefore, the shape of the article is more similar to the shape of the subsequent process. An article shape in the process can be obtained.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a method for determining a shape of a pressed product in a pre-process according to a first embodiment of the present invention.

FIG. 2 is a perspective view for explaining similarity in the shape determination method according to the first embodiment.

FIG. 3 is a perspective view for explaining similarity in the shape determination method according to the first embodiment.

FIG. 4 is a perspective view for explaining a combining method in the shape determining method according to the first embodiment.

FIG. 5 is a flowchart illustrating a method of determining a shape in a pre-process of a pressed product according to a second embodiment of the present invention.

FIG. 6 is a perspective view of a novel pressed product for explaining a shape determining method according to the second embodiment.

FIG. 7 is a perspective view of an existing pressed product for explaining a shape determining method according to the second embodiment.

FIG. 8 is a block diagram illustrating a shape state when the shape determination method according to each embodiment of the present invention is used together.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Searched article 11a Upper surface 11b Lower surface 12 Searched object 12a Upper surface 12b Lower surface 21 Rectangular parallelepiped 22 Grid surface 23 Grid point 24 Vertical line 25 Intersection 26 Intersection 31 Newly pressed product 32 Virtual comparison part 33 Extraction part 41 Existing press processing Article 42 Virtual comparison part 43 Comparison extraction part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G06F 17/50 626 G06F 17/50 626A

Claims (3)

[Claims] 1. A method for determining a shape of a new press-formed product to be newly manufactured in a pre-process using a shape of an existing press-processed product already existing and a shape of an article in the pre-process. The shape of the processed product and the shape of the product in the previous process are made dimensionless to form a database, and the shape of the new pressed product is also made dimensionless. A plurality of processed products are searched from the database, and the article shapes in the preceding process of each of the searched existing pressed products are respectively extracted, and then the extracted article shapes in the preceding processes are extracted. The composite article shape is obtained by synthesis, and then the ratio of the volume of the new press-processed product to the volume of this synthetic article shape is obtained. When retrieving the existing pressed products similar to the new pressed product, consider the rectangular parallelepipeds including these pressed products, and make perpendiculars from a plurality of positions on a predetermined plane of this rectangular solid, The intersection between this perpendicular and the upper and lower surfaces of both pressed products corresponding to the upper die surface and the lower die surface for press working is determined, and the distance between the intersections of the upper surfaces of both pressed products and the lower surface Search based on the similarity expressed by the sum of the distances between the intersections of the intersections, and when combining the article shapes in the previous process of a plurality of existing pressed products searched based on the similarity, a predetermined rectangular parallelepiped Obtain the surface shape by dividing the total value obtained by multiplying the distance from the plane to the upper surface and lower surface of each product shape by each similarity and dividing by the total value of the similarities. Shape determination method in the previous step stampings characterized. 2. A method for determining a shape of a new press-formed product to be newly manufactured in a pre-process using a shape of an existing press-processed product already existing and a shape of an article in the pre-process. The shape of the processed product and the shape of the article in the preceding process are each made dimensionless to form a database, and the shape of the new pressed product is also made dimensionless. And extracting a plurality of comparative extraction portions having a predetermined width in an existing pressed product having a shape similar to the shape of the extracted portion. The step of extracting the shape of the article in the pre-process of the press-processed product, and the shape of the extracted plurality of comparatively extracted portions in the pre-process are synthesized to obtain the extracted portion composite shape. The above-mentioned steps, consisting of the steps described above, are sequentially performed from one end side to the other end side while sliding at intervals of a predetermined width smaller than a predetermined width for a new press-processed product, and the new press-processed product is synthesized in the previous process. Determine the shape of the article, and then calculate the ratio of the volume of the new pressed product to the volume of the synthesized product shape, and restore the synthesized product shape to its original size using this ratio, and resemble the new pressed product When searching for existing press-formed products, consider a rectangular parallelepiped with a predetermined width including the extracted parts of both press-processed products, and make perpendiculars from a plurality of positions on a predetermined plane of this rectangular parallelepiped. The intersection between the upper surface and the lower surface of both pressed products corresponding to the surface and the lower mold surface is determined, and the distance between the intersections of the upper surface of both the pressed products and the lower Search based on the similarity represented by the sum of the distances between the intersections of the faces, and further combine the shapes of each article in the pre-process of the comparative extraction part of multiple existing stamped products searched based on the similarity In this case, the surface shape is obtained by dividing the total value obtained by multiplying the distance from the predetermined plane of the rectangular parallelepiped to the upper surface and the lower surface of each article shape by each similarity and dividing by the total value of the similarities. A method for determining a shape of a pressed product in a pre-process. 3. A method for determining a shape of a new press-formed product to be newly manufactured in a pre-process using a shape of an existing press-processed product already existing and a shape of an article in the pre-process. In the pre-process of a press-processed article, the surface shape is obtained by combining the article shape obtained by the determining method according to claim 1 and the article shape obtained by the determining method according to claim 2. Shape determination method.