JPH07271856A - Method and device for calculating cost and design supporting device - Google Patents

Abstract

PURPOSE:To provide highly accurate cost calculating method and device allowed to be used also for the calculation of product cost before the manufacture of its product by using plural calculation costs or past experiential values. CONSTITUTION:This cost calculating device is constituted of an input device 1 for inputting product data and cost data in each cost generation element, an arithmetic processing part 40 and an output device 29 provided with a display function and the processing part 40 has a cost generation element group data generating means 41 for generating plural cost generation element groups from product data, a maximum/minimum value totalizing means 42 for calculating the maximum value and minimum value of costs in each group and a maximum value and minimum value selecting means 43 for selecting a maximum value out of the minimum values of costs totalized in respective groups and selecting a minimum value out of the maximum values of the costs and outputs a product cost determined by setting up the selected maximum value as a minimum value and setting up the selected minimum value as a maximum value. Consequently a product cost having accuracy higher than the original one can be obtained based upon plural calculated costs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cost calculation method and a device for calculating the cost of a suitable product by incorporating it into a design support device before manufacturing, and particularly, at the stage of designing and the like, the product cost can be easily and accurately achieved. The present invention relates to a cost calculation method and device capable of predicting and calculating the cost, and a design support device incorporating these.

[0002]

2. Description of the Related Art In recent years, productivity has been remarkably improved. Particularly, in order to realize cost reduction of a product, the cost of the product before manufacturing the product (so-called "product cost before manufacturing" or "product cost") Is desired to be understood. In particular, the designer is desired to grasp the product cost while designing the product using the design support device, for example. This product cost is determined by material cost, processing cost, assembly cost, transportation cost, etc., but it changes depending on the daily market fluctuations, production quantity, etc., so the exact value cannot be known until the end of manufacturing. . For example, even if the same product is manufactured based on the same drawing, the actual product cost will be different if the manufacturing date is different. Therefore, the designer calculates the product cost as an estimated value from the design data and uses the value in the design. In such a design field, a more accurate method for calculating the cost of the product is desired in order to reduce the cost of the product.

Conventionally, such a product cost is calculated from the total cost of the input / saved parts and the input assembly time, as shown in, for example, Japanese Patent Laid-Open No. 1-116766. It was calculated by calculating the sum with the assembly cost. In this prior art, it is stated that the cost of parts is drawn from the database,
No disclosure is made regarding the method of calculating the value. The component cost is generally estimated by the designer based on the estimated purchase price for purchased parts and the sum of the material cost and processing cost for self-made parts. There is. Further, there is a description that the assembly cost is obtained by multiplying the sum of the standard time labor amount and the indirect cost by the assembly time.

Although the above-mentioned prior art further describes the cost accuracy, it merely discloses the input method and does not describe anything about its usage. However, as a method of using this accuracy-related information, in general, when there are multiple types of cost calculation methods, it is considered to use the cost calculated by a more accurate calculation method. To be

FIG. 7 shows an example of an apparatus for calculating the cost of a product based on the cost calculating method according to the prior art.
Shown in. In the figure, the input device 100 performs input processing of “product data”, an element that is a unit in which a cost is generated in product manufacturing (“cost generation unit element”), and the “cost data”. As will be described in detail later, this "product data" is data representing the specifications of the product for which the cost is to be calculated. Specifically, what kind of parts are configured and what those parts are It is data that indicates whether the relationship is assembled. The "cost generation unit element" is an element to which a cost value is specifically associated, such as one component, one component assembly operation, and one site processing operation. Further, the "cost data" further includes precision data for indicating the precision of the value, and the precision data is represented in a predetermined format.

Further, reference numeral 200 in the drawing indicates an arithmetic processing unit composed of, for example, a computer, but the arithmetic processing unit 200 is further necessary and sufficient "cost generating unit element" for manufacturing one product. The cost generating element set data generating means 201 for generating the set of 1), the high precision cost selecting means 202, and the cost totaling means 203. This cost generation element set data generation means 201
Then, in general, a set of “cost generation unit elements” that can be plural types is generated. Also, the high-precision cost selection means 20
In No. 2, the cost is totaled based on each of the plurality of sets of data generated by the cost generating element set data generating means 201. At this time, the one with the higher accuracy is selected from the results of the cost totaling. belongs to. And
The cost tallying means 203 tallies costs based on the cost generation element set selected by the high precision cost selecting means 202. As a result, a more accurate cost is calculated. Finally, the calculated cost is output to the output device 300 as "product cost before manufacturing".

[0007]

However, the cost calculation method by the single method according to the prior art as described above, or the method of simply selecting a highly accurate calculation method has sufficient accuracy. The cost to manufacture the product cannot be calculated. The reason is that even if the cost is calculated by a plurality of methods, the cost cannot be calculated with the accuracy higher than the highest accuracy among them.
This is because it is not always possible to obtain the “product cost before manufacturing” with an accuracy that the designer can be satisfied with.

Therefore, in the present invention, in view of the above-mentioned problems in the prior art, the cost is calculated by a plurality of methods, and the cost calculated for each of the plurality of options is used to calculate the original cost. An object of the present invention is to provide a cost calculation method and a cost calculation device capable of calculating a cost with accuracy higher than the accuracy, that is, a “product cost” with higher accuracy, and a design support device incorporating these.

On the other hand, the cost calculation is basically
It is based on past experience. Even if the user empirically obtains and inputs some data, it is an experience value based on the actual value. Basically, it is based on the actual value, but there are various options as to what unit and how to use the actual value. To give an example from the part close to the product, the method of using the actual value as the whole product as one lump is as follows.
Next, there may be a method of using the actual value of the unit of parts or subassemblies and the unit of assembly work. Especially in the latter case, since there are usually multiple component hierarchies, there is a choice as to which level to use it, and
You don't have to be at the same level on each branch, so you have more choices.

When there are a plurality of options as described above, it is desirable to calculate the cost as accurately as possible by combining a plurality of methods. In response to such a demand, in the above-mentioned conventional technology, the cost is calculated only by a method of simply comparing the accuracy and selecting the cost of a method with higher accuracy, and the above-mentioned requirements are not always satisfied. Was not.

Therefore, in the present invention, in view of the above-mentioned problems in the prior art, the cost calculated for each of the plurality of options is used, and the original accuracy is maintained, especially based on the past results. An object of the present invention is to provide a cost calculation method and a cost calculation device capable of calculating a highly accurate “product cost” with the above-mentioned accuracy, and a design support device incorporating them.

[0012]

The above object of the present invention is to:
According to the present invention, first, there is provided a cost calculation method for calculating a product cost before manufacturing, wherein at least product data of a product to be manufactured, cost data representing a cost of each cost generation unit element of the product, and Cost accuracy data representing the accuracy of cost data is input, and from the input product data, cost data and cost accuracy data, a plurality of costs having a maximum value and a minimum value are calculated, and each of the plurality of costs is input. The maximum value among the minimum values is the minimum value, and
This is achieved by the cost calculation method in which the minimum value among the maximum values of the plurality of costs is set as the maximum value, and thus the product cost to be manufactured is set.

Further, according to the present invention, the above-mentioned object of the present invention is a cost calculation device for calculating the product cost before manufacturing: product data representing the content of the product before manufacturing, An input device for inputting cost data representing costs in cost generating element units and cost accuracy data representing accuracy of the cost data, and cost generation for generating a plurality of sets of cost generating elements from the product data The maximum value of the cost based on the cost data and the cost accuracy data input by the input device for each of the plurality of sets of cost generation elements generated by the element set data generation means and the cost generation element set data generation means And a maximum value minimum value totaling means for totaling the minimum values, a maximum value among a plurality of minimum values totaled by the maximum value minimum value totaling means, and the maximum value Maximum value minimum value selecting means for selecting the minimum value among a plurality of maximum values totaled by the small value totaling means, and the product cost by the maximum value and the minimum value selected by the maximum value minimum value selecting means Output device to output,
It is achieved by a cost calculation device equipped with.

Furthermore, the above-mentioned object of the present invention is, according to the present invention, a cost calculation device for calculating the product cost before manufacturing: (a) product data representing the content of the product before manufacturing , Data regarding the component cost and manufacturing cost of the product, precision data indicating the precision of the data regarding the component cost and manufacturing cost, product cost data based on past results, and product cost precision data indicating the precision of the product cost data And (b) a maximum value / minimum value totaling means for totaling the maximum value and the minimum value of the cost from the product data based on the data on the component cost and the manufacturing cost, (c) ) Maximum value / minimum value calculating means for totaling maximum and minimum values of costs from the product cost data and the product cost accuracy data, (d) the maximum Select these maximum values from among the computed minimum cost at a minimum aggregated minimum cost and the maximum and minimum value computing means for collecting unit, and,
A maximum value / minimum value selecting means for selecting these minimum values from the maximum value of the costs totaled by the maximum value / minimum value totaling means and the maximum value of the costs calculated by the maximum / minimum value calculating means; (E) Cost output means for outputting the product cost according to the maximum value and the minimum value selected by the maximum value / minimum value selection means, and (f) based on the output accompanied by the maximum value and the minimum value from the cost output means. And a cost calculation device including an output device for displaying the product cost.

Further, as a configuration according to one embodiment of the present invention, it is a device for calculating a product cost before manufacturing, and (a) product cost data representing the product cost of the product or a product manufactured in the past. , Product cost accuracy data representing the accuracy of the product cost, product data representing the content of the product before manufacturing, part cost data representing the part cost of the parts constituting the product, part cost accuracy representing the accuracy of the part cost Data, manufacturing cost data representing the manufacturing cost of manufacturing the product, an input device for inputting manufacturing cost accuracy data representing the accuracy of the manufacturing cost, and (b) a product cost for managing the product cost data input from the input device. Data management means, (c) product cost data for storing the product cost data based on a command from the product cost data management means Storage device, (d) product cost accuracy data managing means for managing the product cost accuracy data input from the input device, and (e) storing the product cost accuracy data based on a command from the product cost accuracy data managing means. A product cost accuracy data storage device, (f) product data management means for managing the product data input from the input device, and (g) product data for storing the product data based on a command from the product data management means. Storage device, (h) component cost data management means for managing the component cost data input from the input device, and (b) component cost data for storing the component cost data based on a command from the component cost data management means. Storage device,
(E) Component cost accuracy data management means for managing the component cost accuracy data input from the input device, and (e) Component cost for storing the component cost accuracy data based on a command from the component cost accuracy data management means. Precision data storage device, manufacturing cost data management means for managing the manufacturing cost data input from the input device (2),
(W) Manufacturing cost data storage device for storing the manufacturing cost data based on a command from the manufacturing cost data management means, and (F) Manufacturing cost accuracy data management for managing the manufacturing cost accuracy data input from the input device. Means, (y) a manufacturing cost accuracy data storage device for storing the manufacturing cost accuracy data based on a command from the manufacturing cost accuracy data management means, and (t) from the product data managed by the product data management means. , A manufacturing work list extracting means for extracting a manufacturing work list showing a list of manufacturing works necessary for manufacturing the product, and (b) a list of parts constituting the product from the product data managed by the product data managing means. A parts list extracting means for extracting a parts list representing, and (b) the parts cost data managing means based on the parts list. A component cost retrieving means for retrieving the component cost data related to the relevant component from the managed component cost data, and (t) the component cost precision managed by the component cost precision data managing means based on the component list. Parts cost accuracy search means for searching the parts cost accuracy data relating to the corresponding parts from the data, (n) Based on the above manufacturing work list, the corresponding manufacturing operations from the above manufacturing cost data managed by the above manufacturing cost data managing means. (C) manufacturing cost accuracy data relating to the manufacturing operation corresponding to the manufacturing cost accuracy data managed by the manufacturing cost accuracy data managing means based on the manufacturing operation list. Manufacturing cost accuracy search means, (la) product cost, parts cost Maximum value calculating means for calculating the maximum value of each cost from the data representing each of the manufacturing cost and the manufacturing cost and the accuracy data representing each accuracy, and outputting the maximum value data representing the maximum value, (m) product Cost, parts cost,
Minimum value calculation means for calculating the minimum value of each cost from the data representing each of the manufacturing costs and the accuracy data representing each accuracy, and outputting the minimum value data representing it, (C) Maximum value operation Maximum value summing means for summing the maximum value data of the component cost and the maximum value data of the manufacturing cost output from the means, and (d) the minimum value data of the component cost and the minimum value data of the manufacturing cost output from the minimum value calculating means. Minimum value totaling means for totaling
(B) Maximum value selecting means for selecting the maximum value of the minimum value data of the product cost output from the minimum value calculating means and the data output from the minimum value totaling means, and (e) Output from the maximum value calculating means. Minimum value selecting means for selecting the minimum value of the maximum value data of the product cost and the data output from the maximum value totaling means, (h) the data selected by the maximum value selecting means, and the minimum value selecting means A cost calculation device has been devised, which includes a cost output means for converting the output data into an output form and transferring the output data to the output device, and (a) an output device for outputting the data output from the cost output means.

[0016]

According to the above cost calculating method of the present invention,
The product data that represents the contents of the product before manufacturing, the cost data that represents the cost of each product cost generation element and the cost accuracy data that represents the accuracy of the cost data are input, and the maximum and minimum values are input based on these data. A number of different costs with values are calculated. Then, these obtained costs with a plurality of widths are further determined by setting the maximum value of the respective minimum values to the minimum value, and by setting the minimum value of the respective maximum values to the maximum value. Rather than be obtained by the conventional method of simply selecting the one with higher accuracy,
It is possible to calculate the product cost with a narrower width, that is, with higher accuracy.

Further, according to the above-described cost calculating device of the present invention, a device having a configuration for realizing the above-described cost calculating method of the present invention has been proposed, that is, an input device is used for input. Based on the various data and a set of a plurality of cost generating elements generated by the cost generating element set data generating means, a plurality of wide costs having a plurality of maximum values and minimum values are maximum value minimum value totaling means The product cost obtained by the maximum value / minimum value selection means is obtained with high accuracy, and this is output and displayed by the output device.

Further, according to another cost calculating device of the present invention, at least one of a plurality of costs having a plurality of maximum values and a plurality of minimum values is a product based on past performance input by the input device. The maximum value / minimum value calculation means calculates the cost based on the cost data and the product cost accuracy data indicating the accuracy of the data, which enables the highly accurate calculation of the product cost based on the past results. Become.

More specifically, the structure according to one embodiment of the present invention will be described. According to the cost calculation device, product cost data, product cost accuracy data, product data, part cost data, part cost accuracy data , Manufacturing cost data, and manufacturing cost accuracy data are input in advance or when necessary, product cost data management means, product cost accuracy data management means, product data management means, part cost data management means, part cost accuracy, respectively. The data cost is transferred to the data management means, the manufacturing cost data management means, and the manufacturing cost accuracy data management means, and the product cost data storage device, the product cost accuracy data storage device, and
It is stored in the product data storage device, the component cost data storage device, the component cost accuracy data storage device, the manufacturing cost data storage device, and the manufacturing cost accuracy data storage device, and the manufacturing work list is extracted from the product data by the manufacturing work list extracting means. Then, the parts list is extracted from the product data by the parts list extracting means, and the parts cost data is retrieved from the parts cost data by the parts cost searching means based on the parts list. The search means searches the part cost accuracy data for the corresponding part from the part cost accuracy data based on the part list, and the manufacturing cost search means applies the part cost accuracy data based on the manufacturing operation list. Manufacturing costs for manufacturing operations Over data is retrieved, the production cost precision search means, based on the manufacturing operation list,
Manufacturing cost accuracy data relating to the corresponding manufacturing operation is retrieved from the manufacturing cost accuracy data, and data representing each of the product cost, the component cost, and the manufacturing cost and accuracy data representing each accuracy are obtained by the maximum value calculating means. The maximum value of each cost is calculated, and maximum value data representing the same is output, and the minimum value calculating means represents the data representing each of the product cost, the component cost, and the manufacturing cost and the accuracy representing each accuracy. The minimum value of each cost is calculated from the data and the minimum value data representing it is output, and the maximum value totalizing means totals the maximum value data of the component cost and the maximum value data of the manufacturing cost, and the minimum value totaling means. Depending on the minimum component cost data and minimum manufacturing cost The maximum values of the product cost minimum value data and the data output from the minimum value aggregation means are selected by the maximum value selecting means, and the maximum value data of the product cost is selected by the minimum value selecting means. , The minimum value with the data output from the maximum value aggregation means is selected,
Then, the cost output means converts the data selected by the maximum value selection means and the data selected by the minimum value selection means into an output form, transferred to the output device, and output to the output device.

[0020]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 shows a schematic configuration of a cost calculation device which is a most preferable embodiment for carrying out the cost calculation method of the present invention.

In the figure, reference numeral 1 is an input device, which is specifically composed of a keyboard including a mouse and a ten-key pad, which serves as "product data" and a unit in which a cost is generated in manufacturing a product. The input processing of the element "cost generation unit element" and the cost "cost data" is performed. Here, the "product data" is data representing the specifications of the product for which the pre-manufacturing cost is to be calculated. Specifically, what kind of parts the product is composed of and what kind of parts these parts are made of. It is data that indicates whether the relationship is assembled. Further, the "cost generation unit element", which is an element that is a unit in which a cost is generated, is a cost element such as one part in a product, an assembly work of the one part, a work of one part of the product, or the like. It is an element to which a value is specifically associated. The "cost data" is the cost of the "cost occurrence unit element", and the "cost data" is accompanied by the "accuracy data" for indicating the accuracy of the value. The "accuracy data" is, for example, plus or minus (±) 10%, plus or minus (±) with respect to the "cost data".
It is expressed in a format such as 100 yen, plus (+) 15% minus (-) 5%, or a format such as plus (+) 50 yen minus (-) 100 yen.

Next, the arithmetic processing unit 40 is specifically, a central processing unit (CPU) and a random access memory (RA).
M), a read-only memory (ROM), a hard disk (HD), or other type of storage device such as an external storage device. It is divided into maximum value / minimum value totaling means 42 and maximum value / minimum value selecting means 43.

First, the cost generating element set data generating means 4
In 1, a set of elements (= “cost generation unit element”) that is a unit for generating a cost, which is necessary and sufficient for manufacturing one product, is set based on various data input by the input device 1. To generate. In general, there can be a plurality of types, so a plurality of sets are generated as needed.

This is the printer shown in FIG. 2 (= manufactured product)
Specifically, the “manufacturing cost” CP of the “printer” P is “upper lid” P1, “lower lid” P2, and “printing section”.
P3, "Paper feed unit" P4 cost of each part (CP1, C
(P2, CP3, CP4) and overall assembly cost (CA)
Sum of (TC = CP1 + CP2 + CP3 + CP4 + CA)
Can be seen as, on the other hand, "upper lid" P1, "lower lid"
Instead of P2, "printing section" P3, and "paper feeding section" P4, the components thereof are "frame" P41, "roller" P42, "motor" P43, "gear A" P44,
"Gear B" P45, and two "gear shafts" P46 and P
47, the cost of each of these parts (CP1, CP2, CP
3, CP41, CP42, CP43, CP44, CP4
5, CP46, CP47) and the cost of assembling the "paper feed section" P4 (CA4) and the cost of overall assembly (CA) (T
C = CP1 + CP2 + CP3 + (CP41 + CP42 +
CP43 + CP44 + CP45 + CP46 + CP47 +
It can also be seen as CA4) + CA). As described above, each of them is a cost-generating element (more precisely, “cost-generating unit element”), and when a certain product is manufactured, these cost-generating elements have a plurality of cost-generating element groups. . Also, the cost of each of the above parts, for example, CP1,
CP2, CP3, CP4, etc. are “cost data”.

Subsequently, in the maximum value / minimum value totaling means 42,
The "maximum value of cost" and the "minimum value of cost" are summed up for each of a plurality of sets of data (a plurality of sets of "cost generation unit elements") generated by the cost generation element set data generation means 41. . Here, the "maximum value of cost" and the "minimum value of cost" are, in addition to the value represented by the above-mentioned "cost data", the value of the accuracy described above, and thereby the maximum case and the minimum case. The case is calculated.

Further, in the maximum value / minimum value selecting means 43,
The minimum value among the maximum values of the plurality of sets obtained by the maximum value / minimum value totaling means 42 and the maximum value among the minimum values of the plurality of sets obtained by the maximum value / minimum value totaling means 42. Select values and. Then, the arithmetic processing unit 40 outputs, that is, displays the calculated cost on the output device 29 including, for example, a CRT or an LCD display device.

FIG. 3 shows an example of a procedure of processing performed by the cost calculation apparatus according to the above-described embodiment, particularly, the arithmetic processing unit 40 thereof. First, when the process is started, "product data", an element that is a unit in which a cost is generated in product manufacturing, and its cost ("cost generation unit element" and "cost data") are input from the input device 1. (S50). Next, the "product data" is transferred to the cost generation element set data generation means 41, and from the "product data", an element that is a unit that generates a cost necessary and sufficient to manufacture one product ("cost" Data of the generation unit element ") is generated (S51). As described with reference to FIG. 2, generally, there can be a plurality of types of this set, so a plurality of sets are generated as necessary.

Next, the maximum value / minimum value totaling means 42 sets data of a set of elements ("cost generation unit element") which is a unit for generating a cost, and the cost data ("" The maximum value and the minimum value for each set are aggregated from the cost data ”) (S52). Further, the maximum value / minimum value selecting means 43 selects the minimum value among the maximum values of each group that has been tabulated and the maximum value among the minimum values of each group that has been tabulated (S53). Finally, the selected value is output to the output device 29 (S54). In addition,
As for the output of the value, it is possible to output the maximum value and the minimum value as they are, and instead of this, it is also possible to output them after converting them into the form of the average cost and accuracy.

FIG. 4 shows the maximum / minimum value selecting means 43.
The relationship between the minimum value among the maximum values for each group and the maximum value among the minimum values for each group is shown. The horizontal axis of the figure is the cost value, and the "product cost" including accuracy is a value having a width in this horizontal direction. For example, in the case of the above-mentioned printer (= manufactured product), the calculation of the “product cost” TC of this printer includes a plurality of sets of “cost occurrence unit element” data (two in the example of FIG. 2 above). Since there are, there are two "product costs" TCA and TCB. These two "product costs" TCA and TCB are
Since each of them is a cost including accuracy, the value has a width in the horizontal direction. In the "product cost" TCA, the minimum value is TCAmin and the maximum value is TCAmax.
Is. On the other hand, in the "product cost" TCB, the minimum value is TC
Bmin and the maximum value is shown as TCBmax.

Therefore, if the true value of the "product cost" TC is included in this range, the lower limit TCmin of the "product cost" TC is two calculated costs TCA, as shown in the lower half of this figure. And the TCB value is the maximum of the minimum of TCAmin, and the upper limit of the “product cost” TC should be the minimum of these two maximums of TCBmax. As a result, the true "product cost" TC is TCAm
It is included between in and TCBmax.
In this way, the cost is calculated from the data of a plurality of sets of "cost generation unit elements", and the maximum of the minimum value and the minimum of the plurality of costs are selected, which has been generally performed conventionally. The one with high accuracy, that is, the one with narrow width was simply selected (in the example of FIG. 4, TCBmin-
Compared with the cost calculation method (which becomes TCBmax), a solution having a narrower width, that is, a solution having a higher precision than the original precision (TCmin ≦ TC ≦ TCmax) can be obtained.

Further, FIG. 5 shows a cost calculating apparatus which is another embodiment of the present invention. In the figure, reference numeral 1 is an input device for inputting data necessary for various cost calculations as in the embodiment of FIG. 1, but in other embodiments, specifically, the present or "Product cost data" that represents the product cost of a product manufactured in the past, "Product cost accuracy data" that represents the accuracy of the product cost,
"Product data" that represents the content of the product before manufacturing, "part cost data" that represents the part cost of the parts that make up the product, "part cost accuracy data" that represents the accuracy of the part cost, and the product is manufactured. The "manufacturing cost data" representing the manufacturing cost and the "manufacturing cost accuracy data" representing the accuracy of the manufacturing cost are input.

Here, the "product cost data" is the cost data of a product similar to the product whose cost is to be calculated, or has been manufactured in the past with the same specifications as the product whose cost is to be calculated. It is a cost at that time, and has a cost value as an actual result. Corresponding "product cost accuracy data" represents uncertainties caused by differences in product specifications, differences in manufacturing time, etc. Again, for example, plus or minus (±)
10%, plus or minus (±) 100 yen, plus (+)
15% minus (-) 5% or plus (+) 5
It is expressed in a format such as 0 yen minus (-) 100 yen.

The "product data" is the same as in the above-mentioned embodiment, and is data representing the specifications of the product for which the cost is to be calculated. It is data indicating whether parts are assembled in a relationship. For example, in the case where the product to be manufactured is a printer, the product "printer" P is "upper lid" P1, "lower lid" P2, and "printing section" P, as in the case shown in FIG.
3, the "paper feed unit" P4, and the "paper feed unit" P4 is a "frame" P4.
1, "roller" P42, "motor" P43, "gear A"
P44, "gear B" P45, and two "gear shafts" P46 and P47 are usually composed of a plurality of parts, such as a hierarchical structure. At this time, a component that is a component as a whole when viewed from the whole, such as the "paper feeding unit" P4, but that is itself composed of smaller components may be referred to as a "subassembly".
This "product data" is stored in one of such multiple layers.
Only one product and the parts in the layer immediately below (in the example of Fig. 3,
The cost can be calculated by using the "upper lid" P1, the "lower lid" P2, the "printing section" P3, and the "paper feeding section" P4), but the "subassembly" is regarded as a product (for example, " The "paper feed unit" P4 which is a subassembly is regarded as a product, and the component cost of a plurality of layers (that is, "frame" P41, "roller" P42, "motor" P43, by performing recursive processing). "Gear A" P44,
It can be calculated from "gear B" P45 and costs of a plurality of "gear shafts" P46 and P47), but the latter may be desirable for the user.

The "part cost data" is the cost of the individual parts of the product, and (1) the value of past manufacturing results of the same or similar specifications is input to this value.
(2) What the user inputs by analogy with experience,
(3) If this part is a sub-assembly, it is considered as a product, and the value calculated by the device is included. The "part cost accuracy data" corresponding to this data represents an uncertain portion caused by differences in product specifications, differences in manufacturing time, etc., and may be expressed in the same format as the above accuracy data. I can.

It should be noted that the components handled as the above-mentioned "component cost data" and "component cost accuracy data" can be treated as non-substantial type elements as components. For example, in the example of FIG. 3 described above, the manufacturing needs data on which model number of the gear to be used specifically, but there is a stage in which only "gear" is decided during the design. In order to enable cost calculation at this stage as well, it is possible to register a part called "gear" and register a cost with reduced precision so that it can be used regardless of which model of gear is used. By using this data, the cost can be calculated while the accuracy is low in the middle of the design, and the more accurate the cost can be calculated as the product specifications become more detailed.

The "manufacturing cost data" is the cost required for the work for manufacturing the parts required for the product. Here, "work" means preparation of manufacturing equipment, arrangement of parts, transportation,
This includes the installation and assembly of each part.
It depends on the product and manufacturing equipment that the user envisions. The corresponding "manufacturing cost accuracy data" represents an uncertain portion caused by differences in product specifications, differences in manufacturing time, etc., and can also be expressed in the same format as the accuracy data above. I can.

Next, the arithmetic processing unit 40 'is specifically, a central processing unit (CPU) and a random access memory (RA).
M) and a read-only memory (ROM) and other storage devices, and is divided into blocks described in detail below according to their functions. In addition,
In this embodiment, a storage device such as a hard disk (HD) is further provided as an external device, and these are shown as storage devices for various data in the figure, but these storage devices are divided into a plurality of parts. Alternatively, only one storage device may be divided and used.

In the arithmetic processing unit 20, reference numeral 2 is a product cost data managing means, which manages the "product cost data" input from the input device 1. Specifically, the input “product cost data” is transferred to the product cost data storage device 3 which is an external storage device, or
Processing such as outputting “product cost data” is performed as necessary. The product cost data storage device 3 is an external storage device for storing the "product cost data" based on a command from the product cost data management means 2.

Reference numeral 4 is a product cost precision data managing means for managing the "product cost precision data" input from the input device 1, and specifically, the input "product cost precision data" is the product cost. Accuracy data storage device 5
Or transfer the "product cost accuracy data" as necessary. The product cost accuracy data storage device 5 is an external storage device for storing the “product cost accuracy data” based on a command from the product cost accuracy data management means 4.

Reference numeral 6 is a product data management means for managing the "product data" input from the input device 1. Specifically, the input "product data" is transferred to the product data storage device 7. Alternatively, processing such as outputting "product data" is performed as necessary. The product data storage device 7 is an external storage device for storing the “product data” based on a command from the product data management means 6.

Reference numeral 8 is a component cost data management means for managing the "component cost data" input from the input device 1, and specifically, the input "component cost data" is stored in the component cost data storage device. Then, the processing is performed such as transferring to "9" and outputting "component cost data" as required. The component cost data storage device 9 is
It is an external storage device for storing the "component cost data" based on a command from the component cost data management means 8.

Reference numeral 10 is a component cost precision data managing means for managing the "component cost precision data" input from the input device 1, and specifically, the input "component cost precision data" is the component cost. Transferred to the precision data storage device 11 and, if necessary, "component cost precision data"
Is output. The component cost precision data storage device 11 is an external storage device for storing the “component cost precision data” based on a command from the component cost precision data management means 10.

Reference numeral 12 is a manufacturing cost data managing means for managing the "manufacturing cost data" input from the input device 1, and specifically, the manufacturing cost data storage device stores the input "manufacturing cost data". Then, the data is transferred to No. 13, and "manufacturing cost data" is output as necessary. Then, the manufacturing cost data storage device 13
Is an external storage device for storing the "manufacturing cost data" based on a command from the manufacturing cost data managing means 12.

Reference numeral 14 is a manufacturing cost precision data managing means for managing the "manufacturing cost precision data" input from the input device 1. Specifically, the input "manufacturing cost precision data" is a manufacturing cost. Transferred to the precision data storage device 15 and, if necessary, "manufacturing cost precision data"
Is output. That is, the manufacturing cost accuracy data storage device 15 is an external storage device for storing the “manufacturing cost accuracy data” based on a command from the manufacturing cost accuracy data management means 14.

Next, reference numeral 16 in the drawing is a manufacturing work list extracting means, and specifically, it is necessary for manufacturing a product from the "product data" managed by the product data managing means 6. A manufacturing work list representing a list of manufacturing works is extracted. This manufacturing work list is a list of assembling work items when collecting parts and assembling a product, a list of processing work items when processing parts, and the like. For a list of the assembly work items, see, for example, “Current status of design evaluation methods from the viewpoint of manufacturability” in “Design and Drafting” Vol. 26, No. 1 (published in January 1991) of the Japan Society for Design Engineering. An example of evaluating the assembly workability of each part (that is, assigning a score to the assembly work content of each part) is shown in "Design improvement based on the assembly work evaluation method". It has been pointed out that the cost of the assembly work will be converted into the cost, and this can be used. When the structure of the product represented by the “product data” has a plurality of hierarchies, it is possible to create a list of assembling work items over a plurality of hierarchies.

Reference numeral 17 denotes a parts list extracting means, which creates a parts list showing a list of parts constituting a product from "product data" in the product data storage device 7 managed by the product data managing means 6. Extract. When the structure of the product represented by this "product data" has a plurality of layers, it is also possible to create a list of parts that extend over a plurality of layers.

Reference numeral 18 denotes a component cost search means, which is based on the component list extracted by the component list extraction means 17 and is stored in the component cost data storage device 9 managed by the component cost data management means 8. From "Part cost data", select "Part cost data" for the corresponding part.
To search. As a result, the cost values of the parts required for the product are output one after another.

Reference numeral 19 is a component cost accuracy retrieval means, which is also based on the component list extracted by the component list extraction means 17 and is managed by the component cost accuracy data management means 10 by the component cost accuracy data storage device. The “part cost accuracy data” in 11 is searched for the “part cost accuracy data” of the part related to the corresponding part.
As a result, the cost accuracy values of the necessary components are output one after another.

Reference numeral 20 is a manufacturing cost search means, and in the manufacturing cost data storage device 13 managed by the manufacturing cost data management means 12 based on the manufacturing work list extracted by the manufacturing work list extracting means 16. The “manufacturing cost data” related to the relevant manufacturing operation is searched from the “manufacturing cost data”. As a result, the cost values of the required manufacturing work are output one after another.

Further, reference numeral 21 is a manufacturing cost precision searching means, and based on the manufacturing work list extracted by the manufacturing work list extracting means 16, the manufacturing cost precision data managing means 14 manages the manufacturing cost precision. The “manufacturing cost accuracy data” in the data storage device 15 is searched for the manufacturing cost accuracy data relating to the corresponding manufacturing operation. Thereby, the value of the accuracy of the cost of the required manufacturing work is output one after another.

Next, reference numerals 22 and 22 in the figure are maximum value calculating means, which are output from the component cost retrieving means 18, the component cost precision retrieving means 19, the manufacturing cost retrieving means 20 and the manufacturing cost precision retrieving means 21. “Parts cost data” and “Parts cost accuracy data” or “Manufacturing cost data” and “Manufacturing cost accuracy data” are input respectively, and data representing each of the parts cost and the manufacturing cost and the respective The maximum value of each cost is calculated from the accuracy data representing the accuracy, and the maximum value data representing it is output. At this time, there are various methods of expressing the accuracy, but in this embodiment, for example, when the cost is expressed as α and the accuracy is expressed as plus or minus (±) β%, the maximum value is calculated as α × (1 + β / 100). Required by processing.

Reference numerals 23 and 23 in the figure are minimum value computing means, which are output from the component cost retrieving means 18, the component cost precision retrieving means 19, the manufacturing cost retrieving means 20 and the manufacturing cost precision retrieving means 21. Input "Parts cost data" and "Parts cost accuracy data" or "Manufacturing cost data" and "Manufacturing cost accuracy data", respectively. The minimum value of each cost is calculated from the accuracy data representing and the minimum value data representing it is output. At that time, there are various methods of expressing accuracy, but in this embodiment, the cost is α
If the precision is expressed as plus or minus (±) β in, the minimum value is obtained by the calculation process α−β.

Further, reference numeral 24 in the drawing is a maximum value totaling means, which totals the maximum value data of "part cost" and the maximum value data of "manufacturing cost" output from the maximum value calculating means 22, 22. To do. These maximum value calculation means 22,
The output result of 22 is a total of the maximum value of the "component cost" and the maximum value of the "manufacturing cost", which is the manufacturing operation cost, which is a value that may be the cost of the product to be manufactured. Is the maximum value of.

Further, reference numeral 25 in the drawing denotes a minimum value totaling means, which totalizes the minimum value data of "part cost" and the minimum value data of "manufacturing cost" output from the minimum value calculating means 23, 23. To do. These output results are totals of the minimum value of the “component cost” and the minimum value of the “manufacturing cost”, and indicate the minimum value of the cost of the product.

On the other hand, reference numeral 22 'in the figure is also a maximum value calculating means, and this maximum value calculating means 22' is outputted from the product cost data managing means 2 and the product cost accuracy data managing means 4. "Product cost data" and "Product cost accuracy data" are input respectively, and regarding the product cost, the maximum value of the product cost is calculated from the data representing each and the accuracy data representing each accuracy,
The maximum value data representing that is output. At that time, there are various methods of expressing accuracy, but similarly to the above, for example, when the cost is α and the accuracy is expressed as plus or minus (±) β%, the maximum value is calculated as α × (1 + β / 100). Depending on the processing, or when the cost is α and the precision is expressed as plus or minus (±) β, the maximum value is calculated by α + β.

Reference numeral 23 'in the figure is also a minimum value calculating means, but this maximum value calculating means 23' is a "product" output from the product cost data managing means 2 and the product cost accuracy data managing means 4. Enter "Cost data" and "Product cost accuracy data" respectively, and
The minimum value of the product cost is calculated from the data representing each and the accuracy data representing each accuracy, and the minimum value data representing that is output. The accuracy can be expressed in such a way that the cost is α and the accuracy is plus or minus (±).
When expressed as β%, the minimum value is α × (1-β / 1
00), the cost is α and the precision is expressed as plus or minus (±) β,
The minimum value is obtained by a calculation process called α-β.

As described above, according to another embodiment of the present invention, the cost of the product to be manufactured is calculated based on the above-mentioned "product data", "part cost data", "manufacturing cost data", and further , “Part cost accuracy data” and “Manufacturing cost accuracy data” are used to obtain data having a maximum value and a minimum value and having a range. On the other hand, the maximum value and the minimum value can be calculated by using "product cost data" and "product cost accuracy data", which represent the product cost of the product manufactured now or in the past, as other types of data of the cost of the manufactured product. Obtained as data with a certain width. Then, the maximum value selection means 2 indicated by reference numeral 26 in the drawing
6. By the minimum value selection means 27, the minimum value and the maximum value of the minimum values of the plurality (two in this embodiment) of data,
By selecting the maximum value of data and the minimum value of the maximum values, more accurate cost data is calculated.

This is shown in more detail in FIG. Also in this figure, as in the case of FIG. 4 described above, the value of the cost is taken on the horizontal axis, and the cost A is the cost calculated by using the “component cost data” and the “manufacturing cost data”. "Part cost accuracy data" and "Manufacturing cost accuracy data"
Gives wide data with maximum and minimum values. That is, the minimum value a1 of the cost A is the output from the maximum value selecting means 26 of FIG. 5, and the maximum value a of the cost A is
2 is the output of the minimum value selection means 27. on the other hand,
The cost B calculated by using the “product cost data” and the “product cost accuracy data” is also wide data having a maximum value and a minimum value, like the cost A described above.
The minimum value b1 of the cost B is the output from the minimum value calculating means 23 'in FIG. 5, and the maximum value b2 of the cost B is the output of the maximum value calculating means 22'.

If the true value of the cost of the product to be manufactured is included in this range, the lower limit of the cost is a1 which is the maximum value of the two minimum values, as shown in the lower half of this figure. , The upper limit of the cost should be b2 which is the minimum value of the two maximum values. As a result, the true product cost is included between these a1 and b2. In the conventional method, only the one with high accuracy, that is, the one with narrow width in FIG.
It was concluded that it was between. On the other hand, according to the result obtained by the cost calculation method of the present invention, a narrower solution, that is, a highly accurate solution can be obtained.

Returning to FIG. 6 again, the data output from the minimum value totaling means 25 to which the minimum value data of the product cost output from the minimum value calculating means 23, 23 is input is the individual product. The minimum value of the cost of the element is integrated, while the output from the minimum value calculating means 23 'is the minimum value of the cost of the product obtained by different methods. Therefore, the more accurate minimum value is the larger value of these two minimum values, and this maximum value selection means 2
At 6, the larger value is selected.

Reference numeral 27 in the figure denotes maximum value data of "product cost" output from the maximum value calculating means 22 'and maximum value of product cost output from the maximum value calculating means 22 and 22. Maximum value counting means 2 with data as input
4 is a minimum value selecting means for selecting the minimum value with the data output from the data No. 4. The minimum value selecting means 27, like the maximum value selecting means 26, selects a more accurate maximum value.

Finally, reference numeral 28 is a cost output means, which converts the data selected by the maximum value selection means 26 and the data selected by the minimum value selection means 27 into, for example, an image output form. The data output from the cost output means 28 is transferred to the output device 29 for displaying and outputting. Specifically, (a) simply input two input values to the output device 2
In the case of transferring to (9), the average value (α + β) / 2 is output as the cost from the two input values α and β, and (α−β) / 2 is output as the accuracy (c). From the two input values α and β, the cost is the average value (α +
In some cases, (α−β) / (α + β)% may be output as β) / 2 as the accuracy. Further, in the case of (d), if accuracy data is not required, only the average value may be output as the cost.

FIG. 8 shows the configuration of the design support device incorporating the cost calculation device. The input device 1 is a device for inputting product data, a command for editing product data, cost data representing a cost of a product cost generating element unit, and accuracy data representing accuracy of the cost data. The product data editing means 400 is a device for editing and recording the product data recorded in the product data recording memory 401 in accordance with the editing command input from the input device. The product data recording memory 401 is a memory for recording the first input product data and the edited product data. The cost generation factor set data generation means 41 is the same as that shown in FIG. 1, and is a device that inputs the product data recorded in the product data recording memory and generates a plurality of sets of cost generation factors. The means 41, the means 42 and 43, and the output device 29 constitute the calculation device of FIG. The output device 29 is
Although only the calculated cost value is shown in FIG. 1, this device also outputs product data.

The user (designer) is
This device is used in the procedure as shown in FIG. First, product data is input using the input device 1 (S55).
Next, the cost of the product represented by this product data is calculated as means 42, 4
It is calculated using 3 (S56). Specifically, a cost calculation command is input from the input device 1 and the result is obtained at the output device 29 (S57). The user (designer) looks at the output calculated cost value, considers it as OK if it is less than or equal to the target cost, outputs the product data, and finishes the design (S58, S60). The output of product data is also performed by specifically inputting a product data output command from the input device 1. If the calculated cost is larger than the target (S
59) It is necessary to reduce the cost by changing the design.
That is, the product data is changed by inputting a product data edit command from the input device. In this case, the change operation is usually a plurality of operations. Further, it is preferable to output the edited product data to the output device for each operation, and perform the next operation while confirming the output. When the necessary editing is completed, the original state is restored again, and the loop for calculating the cost again is entered.

In this work procedure, only the method of responding to the cost target is explained for simplification, but in the design, the function of the product,
There are various goals such as performance, reliability, and strength that must be satisfied.
Since it is necessary to satisfy all of these in the final draft, it is necessary to verify the validity of each goal after the product data is edited and confirm that all the goals are satisfied, as in the case of cost considerations. It is desirable that the apparatus is provided with means for determining the achievement of each of these goals.

[0066]

As is apparent from the above detailed description, according to the present invention, a cost with an accuracy higher than the original accuracy in calculating the product cost, that is, a more accurate "product cost" is calculated. Further, by making available the product cost data based on the past experience, it is possible to calculate the “product cost” with higher accuracy. In addition, by using this method, it is possible to calculate highly accurate costs even in the design stage before product manufacturing,
By using this, it becomes possible to provide the designer with an environment in which product design can be performed while considering reliable cost reduction, and it is possible to exert extremely excellent effects both technically and socially.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a cost calculation device that is an embodiment for carrying out a cost calculation method according to the present invention.

FIG. 2 is an explanatory diagram specifically showing the concept of a cost generation unit element in the cost calculation device as a component structure of a product.

FIG. 3 is a flowchart showing a cost calculation processing procedure executed in the cost calculation device.

FIG. 4 is a principle explanatory diagram showing a principle of calculating a highly accurate product cost from a plurality of cost data in the cost calculation device.

FIG. 5 is a block diagram showing a more detailed configuration of a cost calculation device according to another embodiment of the present invention.

FIG. 6 is a principle explanatory view showing a principle of calculating a highly accurate product cost in the cost calculation device of FIG. 5;

FIG. 7 is a block diagram showing an example of a cost calculation device according to a conventional technique.

FIG. 8 is a diagram showing an embodiment of a design support device incorporating the cost calculation device of the present invention.

9 is a diagram showing a procedure of using the design support device of FIG. 8 by a user.

[Explanation of symbols]

 1 Input Device 40, 40 'Arithmetic Processing Unit 41 Cost Generating Element Set Data Generation Means 42 Maximum Value Minimum Value Aggregation Means 43 Maximum Value Minimum Value Selection Means 29 Output Device 2 Product Cost Data Management Means 3 Product Cost Data Storage Device 4 Product Cost Accuracy data management means 5 Product cost accuracy data storage device 6 Product data management means 7 Product data storage device 8 Parts cost data management means 9 Parts cost data storage device 10 Parts cost accuracy data management means 11 Parts cost accuracy data storage device 12 Manufacturing cost Data management means 13 Manufacturing cost data storage device 14 Manufacturing cost accuracy data management means 15 Manufacturing cost accuracy data storage device 16 Manufacturing work list extraction means 17 Parts list extraction means 18 Product cost search means 19 Parts cost accuracy search means 20 Manufacturing cost search means 20 Two Manufacturing cost precision search means 22 and 22 'maximum value calculating means 23, 23' minimum value calculating means 24 the maximum value collecting unit 25 minimum aggregator 26 maximum value selecting means 27 the minimum value selecting section 28 cost outputting means

Claims (13)

[Claims] 1. A cost calculation method for calculating a pre-manufacturing product cost, comprising at least product data of a product to be manufactured, cost data representing a cost of each cost-generating unit element of the product, and the cost data. Input cost precision data representing precision, from the input product data, cost data and cost precision data, calculate a plurality of costs having a maximum value and a minimum value, of the minimum value of each of the plurality of costs The cost calculation method is characterized in that the maximum value of the plurality of costs is set as the minimum value, and the minimum value of the maximum values of the plurality of costs is set as the maximum value, and thus the product cost to be manufactured is set. 2. The cost calculation method according to claim 1, wherein when calculating the plurality of costs, a plurality of sets of product cost generation unit elements are extracted from the product data, and based on the extraction result, the cost data is extracted from the cost data. A cost calculation method, characterized in that the plurality of costs are totaled and obtained. 3. The cost calculation method according to claim 1, wherein the product data has a hierarchical structure. 4. The cost calculation method according to claim 1, further comprising: inputting product cost data based on past results to calculate the product cost. 5. The cost calculation method according to claim 4, further comprising inputting component cost data and manufacturing cost data in place of the cost data, and component cost accuracy data and manufacturing cost accuracy data in place of the cost accuracy data. A cost calculation method characterized by: 6. A cost calculation device for calculating a pre-manufacturing product cost: product data representing a pre-manufacturing product content, cost data representing a cost of a product cost generating element unit, and the cost. An input device for inputting cost accuracy data representing the accuracy of data, a cost generating element set data generating unit for generating a plurality of sets of cost generating element sets from the product data, and the cost generating element set data generating unit For each of the plurality of sets of cost generating elements generated in step 1, the maximum value minimum value totaling means for totaling the maximum value and the minimum value of the cost based on the cost data and the cost accuracy data input by the input device. A maximum value among a plurality of minimum values totaled by the maximum value / minimum value totaling means, and among a plurality of maximum values totaled by the maximum value / minimum value totaling means Maximum value minimum value selecting means for selecting the minimum value, an output device for outputting the product cost by the maximum value and the minimum value selected by the maximum value minimum value selecting means, Calculator. 7. The cost calculation device according to claim 6, wherein the cost generation element set data generation means uses the hierarchical structure of the product data input by the input device to store the plurality of sets of cost generation elements. A cost calculation device characterized by generating a set. 8. A cost calculation device for calculating a pre-manufacturing product cost, comprising: (a) product data representing the contents of a pre-manufacturing product, data on a product part cost and a manufacturing cost, and the part. An input device for inputting accuracy data indicating accuracy of data on costs and manufacturing costs, product cost data based on past results, and product cost accuracy data indicating accuracy of the product cost data, (b) the product A maximum value / minimum value totaling means for totaling the maximum value and the minimum value of the cost from the data based on the data on the component cost and the manufacturing cost, (c) the cost from the product cost data and the product cost accuracy data, Maximum value / minimum value calculation means for totaling the maximum value and minimum value of (d) minimum value of cost totaled by the maximum value / minimum value totaling means These maximum values are selected from the minimum values of the costs calculated by the maximum value / minimum value calculating means, and the maximum value of the costs totaled by the maximum / minimum value totaling means and the maximum / minimum value arithmetic operation. Maximum value / minimum value selecting means for selecting these minimum values from the maximum values of the costs calculated by the means, (e) the product according to the maximum value and the minimum value selected by the maximum value / minimum value selecting means. A cost output means for outputting a cost; and (f) an output device for displaying the product cost based on the output accompanied by the maximum value and the minimum value from the cost output means. apparatus. 9. The cost calculation device according to claim 8, further comprising: (g) a parts list manufacturing work list extraction means for extracting parts and manufacturing work necessary for manufacturing the product from the product data, The cost calculating device characterized in that the maximum value / minimum value totaling means of (b) totalizes the maximum value and the minimum value of the cost based on the result extracted by the product data. 10. The cost calculation device according to claim 8, further comprising: (h) management means for managing the plurality of data input from the input device of (a); and (i) the plurality of management devices. A storage device for storing data,
A cost calculation device comprising: 11. The cost calculation device according to claim 9, further comprising: (j) data input from the input device of (a), at least the data relating to the component cost and the manufacturing cost of the product, and the precision indicating the accuracy of the data. Management means for managing the data; (k) a storage device for storing at least the data relating to the component cost and the manufacturing cost of the product and accuracy data representing the accuracy of the data; (l) the () Based on the extraction result from the part list manufacturing work list extracting means in g), the data concerning the corresponding parts cost and manufacturing cost of the product and the accuracy data representing the accuracy of the data are obtained through the managing means in (j). A cost calculation device comprising: a search unit for searching. 12. A device for calculating a product cost before manufacturing, comprising: (a) product cost data representing a product cost of the product or a product manufactured in the past; product cost accuracy data representing a precision of the product cost; Product data representing the content of the product before manufacturing, part cost data representing the part cost of parts constituting the product, part cost accuracy data representing the accuracy of the part cost, and manufacturing cost representing the manufacturing cost of manufacturing the product. Data, an input device for inputting manufacturing cost accuracy data representing the accuracy of the manufacturing cost, (b) a product cost data management means for managing the product cost data input from the input device, and (c) the product cost data management means. A product cost data storage device for storing the product cost data based on a command from (d) the input device. Product cost accuracy data management means for managing product cost accuracy data, (e) product cost accuracy data storage device for storing the product cost accuracy data based on a command from the product cost accuracy data management means, (f) input device Product data management means for managing the product data input from (g) a product data storage device for storing the product data based on a command from the product data management means; A component cost data management means for managing the component cost data; (b) a component cost data storage device for storing the component cost data based on a command from the component cost data management means; Parts cost accuracy data management means for managing the parts cost accuracy data, (L) The above-mentioned parts cost accuracy data A component cost precision data storage device for storing the component cost precision data based on a command from a processing means; (wo) a manufacturing cost data management means for managing the production cost data input from an input device; A manufacturing cost data storage device for storing the manufacturing cost data based on a command from the cost data managing means; (f) a manufacturing cost accuracy data managing means for managing the manufacturing cost accuracy data input from an input device; A manufacturing cost accuracy data storage device that stores the manufacturing cost accuracy data based on a command from the manufacturing cost accuracy data management means, (a) When manufacturing a product from the product data managed by the product data management means, A manufacturing work list extracting means for extracting a manufacturing work list showing a list of necessary manufacturing works; A parts list extracting means for extracting a parts list representing a list of parts constituting a product from the product data managed by the data managing means, and (b) the parts cost data managing means based on the parts list. Component cost search means for retrieving component cost data relating to the relevant component from the managed component cost data, (T) The component cost precision managed by the component cost precision data management means based on the component list Parts cost accuracy search means for searching the parts cost accuracy data relating to the corresponding parts from the data, (n) Based on the above manufacturing work list, the corresponding manufacturing operations from the manufacturing cost data managed by the manufacturing cost data managing means Manufacturing cost retrieval means for retrieving manufacturing cost data regarding (a) based on the above manufacturing work list A manufacturing cost precision retrieval means for retrieving manufacturing cost precision data relating to the corresponding manufacturing operation from the manufacturing cost precision data managed by the manufacturing cost precision data management means, (a) product cost, part cost, manufacturing cost, respectively. With respect to each, and maximum value calculation means for calculating the maximum value of each cost from the data representing each and the accuracy data representing each precision, and outputting the maximum value data representing it, (m) product cost, component cost, Minimum value calculation means for calculating the minimum value of each cost from the data representing each manufacturing cost and the accuracy data representing each accuracy, and outputting the minimum value data representing it, (c) Maximum value operation The maximum value data of the component cost and the maximum value data of the manufacturing cost output from the means are aggregated. Large value totaling means, (d) Minimum value totaling means for totaling minimum value data of component costs and minimum value data of manufacturing cost output from the minimum value calculating means, (b) Product cost output from the minimum value calculating means Maximum value selecting means for selecting the maximum value of the minimum value data of and the data output from the minimum value totaling means, and (e) maximum value data of the product cost output from the maximum value calculating means, and the maximum value totaling means. Minimum value selecting means for selecting the minimum value with the data output from, (h) the data selected by the maximum value selecting means and the data selected by the minimum value selecting means are converted into an output form and output to an output device. A cost calculation device comprising: a cost output device for transferring; and (a) an output device for outputting the data output from the cost output device. 13. A design support device incorporating the calculation device according to claim 6.