JP7340412B2 - Parts management device, parts management method and parts management program - Google Patents

Description

The present invention relates to a parts management device, a parts management method, and a parts management program.

When manufacturing one product by assembling many parts, a "bill of materials" is created that shows which parts and in what quantity are required to manufacture the product. The quality of parts of the same type and model is not completely uniform. Even if the parts are of the same type and model, the quality of the parts will differ slightly if the parts manufacturer, part manufacturing period, parts manufacturing environment, etc. are different.

Product manufacturers are responsible for the quality of their products. Product defects may occur before or after the product is sold. In this case, the product manufacturer must identify the part that caused the defect among the parts that make up the product (traceback), and identify other products that are made up of parts of the same type and type as the identified part (traceforward). ) becomes necessary. In addition to "individual", "lot" is well known as a granularity for managing products or parts.

The traceability information collection system disclosed in Patent Document 1 assigns an internal lot ID to a component in addition to a lot ID assigned by a component manufacturer. The traceability information collection system associates lot IDs and internal lot IDs in a one-to-one or many-to-one manner depending on the management level of parts.

The traceability management system of Patent Document 2 is applied to a continuous manufacturing process in which parts are assembled into subunits, subunits are assembled into units, and units are assembled into final products. At the final stage of a certain process, the traceability management system attaches identification information to the (sub)unit completed in the process, reads the part numbers of the parts used in the process, associates them with the identification information, and sends them to a separate server. Remember.

In the next process as well, the traceability management system adds new identification information to the (sub)unit completed in the process, reads the part numbers of the parts used in the process, and adds new identification information and the part number of the previous process. It is stored separately in a server in association with identification information. The traceability management system avoids reading the part number once read in the previous process again in the subsequent process, reducing the number of readings during assembly work.

Japanese Patent Application Publication No. 2007-193525 JP2008-299721A

When a defect occurs in a product, in order to prevent a similar defect from occurring again, it is necessary to prohibit the use of parts belonging to the same lot as the defective part. However, Patent Documents 1 and 2 focus on the association between parts and products, and do not mention, for example, avoiding parts belonging to the lot when allocating parts.

Just as products are inspected before being put on the market, parts are also inspected as parts before they enter the manufacturing process. However, a product made by assembling parts that have passed the inspection does not necessarily pass the product inspection. Even if there are no defects in the parts themselves, the ``compatibility'' between lots of parts that are assembled at the same time may cause minor defects in the assembly process. However, Patent Documents 1 and 2 do not mention the compatibility of parts.

Therefore, it is an object of the present invention to accurately select parts to be allocated based on the compatibility of lot combinations of parts.

The parts management device of the present invention includes a compatibility diagnosis unit that identifies combinations of lots of parts constituting a product whose inspection result does not meet a predetermined standard among assembled products; a picking management unit that selects a lot of parts as a lot of parts constituting the product to be assembled in the future ; If information indicating the lot is not attached by the parts manufacturer to the part, the part management section includes a parts management unit that newly attaches information indicating the lot to the part based on information that the product manufacturer can obtain about the part, The department creates an instruction to order a lot of the selected parts, the picking management department creates an instruction to pick the lot of the selected parts, and the compatibility diagnosis department determines defects for each lot of the parts. The present invention is characterized in that the number of types of parts included in the specified lot combination of parts is reduced based on the magnitude of variation in acceptance rate.
Other means will be explained in the detailed description.

According to the present invention, parts to be allocated can be accurately selected based on the compatibility of lot combinations of parts.

It is a figure explaining the flow of parts. FIG. 2 is a diagram showing the configuration of a parts management device. This is an example of parts inventory information. This is an example of picking information. This is an example of a picking instruction. This is an example of product inspection information. This is an example of part lot combination compatibility information. This is an example of a parts lot space. This is an example of selection information. It is a flowchart of a processing procedure.

Hereinafter, a mode for carrying out the present invention (referred to as "this embodiment") will be described in detail with reference to the drawings and the like. The parts management device of this embodiment performs parts management at a manufacturer that orders parts from an external company and assembles the parts to manufacture a product. However, this is just an example, and the present invention is also applicable to manufacturers that manufacture parts in-house.

(Flow of parts)
FIG. 1 is a diagram illustrating the flow of parts. A product manufacturer manufactures, for example, a "printed circuit board" as a product. There are actually a wide variety of components that make up the printed circuit board 47. However, to simplify the explanation, it is assumed that the components here are an insulating plate 41, a resistor 42, and an integrated circuit 43.

After the product manufacturer receives the necessary parts from the parts manufacturer, the product manufacturer stores the parts in the parts warehouse 44. In the parts warehouse 44, an insulating plate 41, a resistor 42, and an integrated circuit 43 are stored on a storage shelf 45. Prior to manufacturing the printed circuit board 47, a picking worker or a picking robot (not shown) transports the parts from the parts warehouse 44 to the assembly workshop 46. At this time, the picking worker or the like uses a transport vehicle (not shown) as necessary.

The operation by which a picking worker or the like takes out parts from the parts warehouse 44 is generally called "picking." The operation of a picker or the like to supply parts to the assembly work area 46 is generally called "serving". A picking worker or the like places an integral multiple of "one insulating plate 41, three resistors 42, and two integrated circuits 43" on the tray 48, and then arranges the parts.

It is also possible to separate the transport of parts within the parts warehouse 44 and the transport of parts from the parts warehouse 44 to the assembly workshop 46, and to assign different workers to each. To simplify the explanation, in this embodiment, the storage shelf 45 stored at a predetermined position is transported to another predetermined position in the parts warehouse 44, and the parts are taken out and placed on the tray 48 at that position. The series of operations from then to placing the food at a predetermined position in the assembly work area 46 is called picking.

In the assembly workshop 46, an assembly worker or an assembly robot (not shown) assembles one insulating plate 41, three resistors 42, and two integrated circuits 43 to produce one printed circuit board 47. Repeat the task. The manufactured printed circuit board 47 (product) is transported to a product warehouse 49 by a belt conveyor or the like. Products are always inspected before being shipped. This inspection is for determining whether the product satisfies the specifications required for the printed circuit board 47 or not. Products that pass inspection will be shipped soon.

(Parts management device)
FIG. 2 is a diagram showing the configuration of the parts management device 1. The parts management device 1 is a general computer, and includes a central control device 11, an input device 12 such as a mouse and a keyboard, an output device 13 such as a display, a main storage device 14, an auxiliary storage device 15, and a communication device 16. These are interconnected by a bus. The auxiliary storage device 15 stores parts warehousing information 31, picking information 32, product inspection information 33, and parts lot combination compatibility information 34 (all of which will be described in detail later).

The parts management section 21, picking management section 22, product management section 23, and compatibility diagnosis section 24 in the main storage device 14 are programs. The central controller 11 reads these programs from the auxiliary storage device 15 and loads them into the main storage device 14, thereby realizing the functions of each program (details will be described later). The auxiliary storage device 15 may be configured independently from the parts management device 1. The parts management device 1 is capable of communicating with the terminal device 3 via the network 2 . The terminal device 3 is operated by each worker at each site such as the assembly workshop 46.

(Parts inventory information)
FIG. 3 is an example of the parts inventory information 31. In the parts inventory information 31, in association with the ordering instruction ID stored in the ordering instruction ID field 101, the parts name field 102 shows the part name, the parts lot ID field 103 shows the parts lot ID, and the parts manufacturer name field 104 stores the parts manufacturer name, the parts quantity column 105 stores the parts quantity, the storage date column 106 stores the storage date, the storage address column 107 stores the storage address, and the inventory quantity column 108 stores the inventory quantity. .

The ordering instruction ID in the ordering instruction ID column 101 is an identifier that uniquely identifies the ordering instruction. The ordering instruction is an instruction to the parts manufacturer to deliver parts to the manufacturer.
The component name in the component name column 102 is the name of the component. The part name here is a combination of the common noun of the part, such as "insulating plate", and the part type, such as "B". Furthermore, the model here is a concept that includes all specifications (size, shape, material, etc.) sufficient to specify the type of part. A type such as "B" also indicates that the part is an "insulating plate." In that sense, the common nouns used here are reference information for ease of understanding.

The parts lot ID in the parts lot ID column 103 is an identifier that uniquely identifies a parts lot. A parts lot is a group of parts of the same type manufactured under the same manufacturing element. Generally, a parts manufacturer produces a certain number of parts of a certain type in a certain environment at a certain time by inputting certain raw materials into a certain machine tool and setting certain manufacturing conditions. Now, each of these is called a "manufacturing element", and a combination of multiple manufacturing elements (parts manufacturer, time, environment, machine tool, raw material, manufacturing conditions, model, quantity) is called a manufacturing element vector. A group of parts that all have the same manufacturing elements is called a "parts lot". That is, a parts lot ID is assigned to the manufacturing element vector. The number of individuals included in one parts lot depends on the type of parts, the amount demanded, the manufacturing method, etc., but in some cases it reaches several thousand to tens of thousands.

The parts manufacturer usually specifies the parts lot ID on the parts themselves or on the delivery note before delivering the parts to the product manufacturer. However, there are cases where component manufacturers do not perform such management. In this case, the product manufacturer himself/herself creates a parts lot ID to be assigned to a manufacturing element vector such as "(parts maker, part warehousing time, model, quantity)". The manufacturing element of the manufacturing element vector here is any data that the product manufacturer can obtain about the part. Parts manufacturers are not the only ones who attach parts lot IDs to parts. Parts trading companies, public institutions, etc. may attach parts lot IDs to parts in their own capacity. In this embodiment, the component manufacturer is not limited to a component manufacturer, but is a broad concept that includes any entity that attaches a component lot ID to a component before the component is delivered to the product manufacturer.

The parts quantity in the parts quantity column 105 is the quantity of parts included in the parts lot. In many cases, parts are packaged and delivered by quantity.
The warehousing date in the warehousing date column 106 is the date when the parts lot was stocked in the parts warehouse 44.
The storage address in the storage address column 107 is the location information in the parts warehouse 44 of the storage shelf 45 where the parts lot is stored. For example, if the parts warehouse 44 is a so-called automated warehouse, the storage address will be a three-dimensional coordinate value such as "(#, #, #)". “#” abbreviates a different value.
The inventory quantity in the inventory quantity column 108 is the current number of parts in stock at the storage address. “#” abbreviates a different value.

(Picking information)
FIG. 4 is an example of the picking information 32. In the picking information 32, in association with the picking instruction ID stored in the picking instruction ID column 111, the part name column 112 contains the part name, the parts lot ID column 113 contains the parts lot ID, and the parts quantity column 114 contains the part name. The component quantity is stored in the product ID column 115, and the product ID is stored in the product ID column 115.

The picking instruction ID in the picking instruction ID column 111 is an identifier that uniquely identifies a picking instruction. The picking instruction is an instruction to a picking worker or the like to pick necessary parts from the parts warehouse 44 and deliver the parts to the assembly workshop 46 (details will be described later).
The component names in the component name column 112 are the same as the component names in FIG.

The parts lot ID in the parts lot ID column 113 is the same as the parts lot ID in FIG. However, at the product design stage, this field is blank, or the part lot ID is only temporarily stored solely from a design standpoint. After reflecting the past product inspection results, a new parts lot ID is stored in the column, or a stored temporary parts lot ID is updated (details will be described later).
The parts quantity in the parts quantity column 114 is the quantity of parts to be picked.
The product ID in the product ID column 115 is an identifier that uniquely identifies the individual product (eg, printed circuit board 47).

(Picking instructions)
FIG. 5 is an example of the picking instruction 35. The picking instruction 35 is electronic data (or paper) that summarizes the information of the record 116 of the picking information 32 in FIG. 4 and conveys it to a picking worker or the like. For example, a picking worker or the like can use the parts lot IDs 36a, 36b, and 36c in the picking instruction 35 as search keys to refer to the parts storage information 31 via the terminal device 3, thereby finding the location where the parts lot is stored. know.

(Product inspection information)
FIG. 6 is an example of the product inspection information 33. In the product inspection information 33, in association with the product name stored in the product name field 121, the product ID field 122 shows the product ID, the parts name field 123 shows the part name, and the parts lot ID field 124 shows the parts lot. The ID is stored, the parts quantity is stored in the parts quantity column 125, and the product result is stored in the inspection result column 126.

The product name in the product name column 121 is the name of the product. The product name here is a combination of the common noun of the product, such as "printed circuit board," and the product type, such as "A." Furthermore, the model here is a concept that includes all specifications (size, shape, material, etc.) sufficient to specify the type of product. A model such as "A" also indicates that the product is a "printed circuit board." In that sense, the common nouns used here are reference information for ease of understanding.
The product ID in the product ID column 122 is the same as the product ID in FIG.
The component names in the component name column 123 are the same as the component names in FIG.

The parts lot ID in the parts lot ID column 124 is the same as the parts lot ID in FIG. 3. However, the parts lot ID here is updated or newly stored after reflecting product defects that occurred in the past in the assembly workshop 46 (details will be described later). Even after updating the parts lot ID, etc., a small number of defective products still occur.
The parts quantity in the parts quantity column 125 is the quantity of each part constituting the product (individual).
The product result in the inspection result column 126 is either "pass" or "fail.""Pass" indicates that the product passed the test, and "Fail" indicates that the product did not pass the test.

As described above, what is subject to pass/fail inspection is the product specification, not the component specification. Regarding parts, it is assumed that all parts are of acceptable quality when they are received. Despite this, possible causes of rejection at the product stage include, for example, poor assembly accuracy and poor bonding and fixing of parts. It has been empirically known that such defects are caused by the compatibility between parts lots.

The product manufacturer may express the inspection result in binary terms such as "pass" or "fail," or may express it in numerical values indicating the quality, specifications, etc. of the product. When the inspection result is expressed as a numerical value, the parts management device 1 applies a predetermined threshold value to the numerical value, and determines whether or not to put the product on the market according to the result. That is, the parts management device 1 identifies, among assembled products, a combination of parts that constitute a product whose inspection result does not meet a predetermined standard.

Attention is paid to records 127a, 127b, and 127c (first group) in FIG. Three printed circuit boards A are being inspected. The components assembled in the manufacture of each printed circuit board A are one insulating plate B, three resistors C, and two integrated circuits D. The component lot IDs of the insulating plates B used in the three printed circuit boards A "P0001", "P0002", and "P0003" are all "L001" and are common. Similarly, the lot ID of resistor C is "L101", which is common. The lot ID of integrated circuit D is "L201", which is common. At this time, the inspection results were "pass" for all three products.

Attention is paid to records 128a, 128b, and 128c (second group) in FIG. Three printed circuit boards A are being inspected. The components assembled in the manufacture of each printed circuit board A are one insulating plate B, three resistors C, and two integrated circuits D. The component lot IDs of the insulating plates B used in the three printed circuit boards A "P0004", "P0005", and "P0006" are all "L001" and are common. Similarly, the lot ID of resistor C is "L101", which is common. Up to this point, it is the same as the example of the first group. The lot ID of integrated circuit D is "L202". “L202” is common to “P0004”, “P0005”, and “P0006”, but does not match the examples of the first group. At this time, the inspection results show that two of the three products "pass" and one "fail."

When the above-mentioned test results are obtained, it is natural to think that the appearance of "L202" induces a "fail". It is unclear whether "L202" and "L001" were incompatible, or "L202" and "L101" were incompatible. However, when comparing the combination of "L001", "L101" and "L201" with the combination of "L001", "L101" and "L202", it can be said that the latter is less compatible than the former. It is.

(Parts lot combination compatibility information)
FIG. 7 is an example of the parts lot combination compatibility information 34. In the parts lot combination compatibility information 34, a rejection rate is stored in a rejection rate column 132 in association with the combination of parts lot IDs stored in a parts lot ID column 131.
The combination of parts lot IDs in the parts lot ID column 131 is a combination of the parts lot IDs of each part that constitutes the product (used for assembling the product).

The rejection rate in the rejection rate column 132 is the percentage of the result of dividing the number of failures of the same parts lot combination by the sum of the number of failures and the number of passes of the same parts lot combination in product inspection. In FIG. 7, the value of the failure rate is slightly exaggerated for the sake of clarity.

Looking at FIG. 7, the following can be inferred.
- It seems that the rejection rate increases when component lot "L202" of integrated circuit D is used.
- The compatibility between component lot "L202" of integrated circuit D and insulating plate B does not seem to be related to the rejection rate.
Compare the compatibility between component lot “L202” of integrated circuit D and component lot “L101” of resistor C, and the compatibility between component lot “L202” of integrated circuit D and component lot “L102” of resistor C. The former seems to be worse than the latter.

(Learning the causes of failure)
The process of accumulating failure rates in past inspections and empirically identifying the part lot or combination thereof (the cause of failure) that caused the failure is called learning the cause of failure. Learning here also means statistically confirming the above inferences. The learning results are reflected in subsequent ordering instructions or picking instructions. In other words, the next ordering instruction or picking instruction will avoid the parts lot or combination thereof that caused the rejection.

(Parts lot space)
FIG. 8 is an example of the parts lot space 37. The component lot space 37 has three axes, and each axis is assigned to an insulating plate component lot ID, a resistor component lot ID, and an integrated circuit component lot ID. In the example of FIG. 7, the number of types of component lot IDs for each component is "2". Therefore, by dividing each axis into two numerical ranges (with part lot IDs written inside the arrows), the parts lot space 37 can be divided into 2 ³ =8 cubic areas. Each area in FIG. 8 corresponds to each record in FIG. 7.

Therefore, the parts management device 1 associates failure rates with eight areas. "●" in FIG. 8 indicates a failure rate of 1%, and "●●" indicates a failure rate of 2%. The failure rate for areas without “●” and “●●” is 0%. When the areas corresponding to ● or ●● (failure areas) are defined by thick solid lines and thick dashed lines, it is clear that the failure areas are the four areas on the rear (rear) side in the front and back direction of FIG. 8. become.

Now, the result of dividing the eight areas into left and right and counting the number of ● is "L001:L002=3:3". The result of dividing the eight regions into upper and lower regions and counting the number of ● is "L101:L102=4:2". The result of dividing the eight areas into front and back and counting the number of ● is "L201:L202=0:6". Comparing the magnitude of the variation in the number of ● for each axis, the order of magnitude is "Integrated circuit > Resistor > Insulating board" in descending order. The variation here may be the "maximum value - minimum value" or "dispersion" of the failure rate for each numerical range.

The larger the variation, the higher the possibility that the part is mixed with a part lot that you want to avoid. Specifically, the ranking of the magnitude of variation "Integrated circuit > Resistor > Insulating board" shows the following learning results.
- First, we want to avoid component lot ID "L202" of integrated circuit D.
・Avoid the combination of the component lot ID “L202” of integrated circuit D and the component lot “L101” of resistor C, and the combination of the component lot ID “L202” of integrated circuit D and component lot “L102” of resistor C. I want to.
- Regarding insulating plate B, there is no part lot that should be avoided.

(selection information)
FIG. 9 is an example of the selection information 38. The parts management device 1 creates selection information 38 based on the learning results. Column 39a stores combinations of parts lots that are desired to be avoided. Column 39b stores the parts lot itself that is desired to be avoided. Selection criteria 40a and 40b are stored corresponding to columns 39a and 39b. The selection criterion indicates whether a parts lot (or combination thereof) other than the parts lot (or combination thereof) to be avoided is selected in the picking instruction or in the ordering instruction. Note that "avoidance" and "selection" are words that express both sides of the same process, and in short, component lots other than the component lot to be avoided are selected.

“In picking” and “in ordering” in FIG. 9 may be interchanged. Assume that "L202" is also used to manufacture other products in the same assembly workshop 46, and that "L202" happens to cause a failure only in the inspection of printed circuit board A. In this case, there is no need to avoid (cancel) ordering "L202", and it is sufficient not to pick "L202" for manufacturing printed circuit board A. If there is no other use for "L202", ordering "L202" should be avoided if possible, and even if it is not possible, inspection at the time of warehousing should be made more rigorous. 8 and 9, the parts management device 1 reduces the number of types of parts (the number of dimensions of the parts lot space 37) included in the combination of parts lots to be avoided. Specifically, the component management device 1 removes the insulating board with the smallest variation from the target to be avoided, the integrated circuit with the largest variation as the target to always avoid, and removes the resistor with neither the smallest nor the largest variation from the integrated circuit. Targets to be avoided depending on the combination with the circuit.

(Processing procedure)
FIG. 10 is a flowchart of the processing procedure. As a premise for starting the processing procedure, it is assumed that the picking information 32 is stored in the auxiliary storage device 15 in the state shown in FIG. 4 (the parts lot ID is in the state before review).
In step S201, the parts management unit 21 of the parts management device 1 creates a parts ordering instruction. Specifically, first, the parts management section 21 accepts input by a parts procurement person through the input device 12 of the parts manufacturer name, part name, parts quantity, delivery deadline, etc. The person in charge of parts procurement may input information via the terminal device 3 instead of the input device 12 (the same applies hereinafter).

Second, if the selection information 38 (FIG. 9) is stored in the auxiliary storage device 15 and the parts lot ID to be avoided in ordering is stored, the parts management unit 21 selects the parts lot ID to be avoided. (column 39b) is obtained. In an ideal situation where no products have failed in past inspections, selection information 38 is not stored. However, in many cases, selection information 38 reflecting learning results is stored in the auxiliary storage device 15.

Thirdly, the parts management unit 21 creates an ordering instruction based on the information received in the "first" step S201, and transmits the ordering instruction to the parts manufacturer. In the “second” step S201, when “L202” is acquired as the parts lot ID to be avoided, the parts management unit 21 adds, for example, “Select a parts lot other than L202” to the ordering instruction. If “L202” is a parts lot number uniquely assigned by the product manufacturer as described above, the parts management department 21 “selects a parts lot other than the lot delivered on 〇 year 〇 month 〇”. Add this to the ordering instructions.

In step S202, the parts management unit 21 receives the stocking of parts. Specifically, first, the parts management unit 21 allows a warehousing worker or the like in the parts warehouse 44 to read the parts lot ID of the ordered part via a barcode reader or the like on the terminal device 3, and Accepts input of component names, component quantities, etc. via the input device. At this time, if the parts manufacturer has not attached a parts lot ID to the part, the parts management unit 21, as described above, assigns a new parts lot ID based on, for example, the parts manufacturer and the time when the parts are in stock. Assign a number and attach it to the part.
Second, the parts management unit 21 creates a record of parts inventory information 31 (FIG. 3) based on the information received in the "first" step S202.

In step S203, the picking management unit 22 of the parts management device 1 creates a picking instruction 35 (FIG. 5). Specifically, first, the picking management unit 22 acquires the picking information 32 (FIG. 4) from the auxiliary storage device 15, and further acquires the first record thereof in units of picking IDs. The record obtained at this time is called a "target record."
Second, if the selection information 38 (FIG. 9) is stored in the auxiliary storage device 15 and a combination of parts lot IDs to be avoided in picking is stored, the picking management unit 22 selects the parts to be avoided in picking. Obtain the lot combination (column 39a).

Thirdly, when the parts lot ID of the target record corresponds to the parts lot ID to be avoided, the picking management unit 22 updates the parts lot ID of the target record with a parts lot ID other than the parts lot ID to be avoided. If the parts record column of the target record is blank, the picking management unit 22 newly stores a parts lot ID other than the parts lot ID to be avoided.
Fourth, the picking management unit 22 creates a picking instruction 35 (FIG. 5) based on the target record, and transmits the created picking instruction to the terminal device 3 of a picking worker or the like.
When the component lot ID to be avoided is, for example, "L202," the component lot ID for the component (integrated circuit D) in the picking instruction 35 is, for example, "L201" (symbol 36c).

The picking management unit 22 repeats the process of step S203 for all records of the picking information 32 (FIG. 4).

In step S204, the product management unit 23 of the parts management device 1 creates product inspection information 33 (FIG. 6). Specifically, first, the product management section 23 creates each record of product inspection information 33 based on each record of picking information 32 (FIG. 4). However, at this stage, the test result column 126 remains blank. The product management unit 23 may create multiple records of product inspection information 33 (per product ID) from one record of picking information 32 (per picking instruction ID).

Second, the product management section 23 receives inspection results from the terminal device 3 of an inspection worker or the like in the product warehouse 49. The inspection result is information in which "pass" or "fail" is associated with a product ID.
Thirdly, the product management unit 23 stores the “pass” or “fail” received in the “second” step S204 in the inspection result column 126 of each record of the product inspection information 33.

In step S205, the compatibility diagnosis unit 24 of the parts management device 1 determines whether a predetermined cycle has arrived. The predetermined period is a period at which a statistically sufficient number of new product inspection results can be accumulated. When the predetermined cycle has arrived (step S205 "Yes"), the compatibility diagnosis section 24 proceeds to step S206, and otherwise ends the processing procedure (step S205 "No"). Note that if it is clear that a poor combination has occurred, the compatibility diagnosis section 24 may proceed to step S206 without waiting for the predetermined cycle to arrive.

In step S206, the compatibility diagnosis unit 24 determines a parts lot to be avoided. Specifically, first, the compatibility diagnosis section 24 creates component lot combination compatibility information 34 (FIG. 7) based on the product inspection information 33 (FIG. 6).
Second, the compatibility diagnosis unit 24 creates a parts lot space 37 (FIG. 8) based on the parts lot combination compatibility information 34. The method for creating the parts lot space 37 is as described above in the explanation of FIG.
Third, the compatibility diagnosis unit 24 creates selection information 38 (FIG. 9) based on the parts lot space 37 and stores it in the auxiliary storage device 15.
Thereafter, the processing procedure ends.

In actual operation of the parts management device 1, the processes of steps S201 to S206 will be repeated many times. Each time step S206 is passed, the selection information 38 is updated to the latest state. The broken line in FIG. 10 indicates that the created selection information 38 is reflected when selecting a parts lot during ordering and picking.

(Effects of this embodiment)
The effects of the parts management device of this embodiment are as follows.
(1) The parts management device can avoid combinations of parts lots that have failed product inspection in the past, and select parts lots for assembling future products.
(2) The parts management device can perform part lot management even if the parts manufacturer does not assign a parts lot ID to the parts.
(3) The parts management device can order or pick parts so that the product will not be rejected and the parts once ordered will not be wasted.
(4) The parts management device can accurately reduce the number of types of parts in combinations of parts lots that are desired to be avoided (reducing processing burden).

Note that the present invention is not limited to the embodiments described above, and includes various modifications. For example, the embodiments described above are described in detail to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to having all the configurations described. Furthermore, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add, delete, or replace a part of the configuration of each embodiment with other configurations.

Further, each of the above-mentioned configurations, functions, processing units, processing means, etc. may be partially or entirely realized in hardware by designing, for example, an integrated circuit. Furthermore, each of the configurations, functions, etc. described above may be realized by software by a processor interpreting and executing programs for realizing the respective functions. Information such as programs, tables, files, etc. that implement each function can be stored in a memory, a recording device such as a hard disk, an SSD (Solid State Drive), or a recording medium such as an IC card, SD card, or DVD.

In addition, control lines and information lines are shown that are considered necessary for explanation, and not all control lines and information lines are necessarily shown in the product. In reality, almost all configurations may be considered interconnected.

1 Parts management device 2 Network 3 Terminal device 11 Central control device 12 Input device 13 Output device 14 Main storage device 15 Auxiliary storage device 16 Communication device 21 Parts management department 22 Picking management department 23 Product management department 24 Compatibility diagnosis department 31 Parts warehousing information 32 Picking information 33 Product inspection information 34 Parts lot combination compatibility information 35 Picking instructions 37 Parts lot space 38 Selection information

Claims (3)

a compatibility diagnosis unit that identifies combinations of lots of parts constituting products whose test results do not meet predetermined standards among the assembled products;
a picking management unit that selects a lot of parts other than the specified lot combination of parts as a lot of parts constituting the product to be assembled in the future;
If information indicating the lot is attached to the part by the parts manufacturer, read the information,
If information indicating the lot is not attached to the part by a parts manufacturer, a parts management unit is provided that newly attaches information indicating the lot to the part based on information that the product manufacturer can obtain about the part,
The parts management department is
create instructions for ordering a lot of the selected parts;
The picking management department
creating instructions for picking a lot of the selected parts;
The compatibility diagnosis department is
Reducing the number of types of parts included in the specified lot combination of parts based on the magnitude of dispersion in the rejection rate for each lot of parts;
A parts management device featuring : The compatibility diagnosis section of the parts management device is
Among the assembled products, identify the combination of parts lots that make up the product whose inspection results do not meet predetermined standards,
The picking management section of the parts management device includes:
selecting a part lot other than the specified part lot combination as a part lot constituting the product to be assembled in the future;
The parts management section of the parts management device includes:
If information indicating the lot is attached to the part by the parts manufacturer, read the information,
If information indicating the lot is not attached to the part by the parts manufacturer, new information indicating the lot is attached to the part based on information that the product manufacturer can obtain about the part,
The parts management department is
create instructions for ordering a lot of the selected parts;
The picking management department
creating instructions for picking a lot of the selected parts;
The compatibility diagnosis department is
Reducing the number of types of parts included in the specified lot combination of parts based on the magnitude of dispersion in the rejection rate for each lot of parts;
A parts management method for a parts management device characterized by: For the compatibility diagnosis section of the parts management device,
Among the assembled products, a process is executed to identify a combination of lots of parts that constitute a product whose inspection result does not meet a predetermined standard,
For the picking management department of the parts management device,
causing a process to select a part lot other than the specified part lot combination as a part lot constituting the product to be assembled in the future ;
For the parts management department of the parts management device,
If information indicating the lot is attached to the part by the parts manufacturer, read the information,
If information indicating the lot is not attached to the part by the parts manufacturer, execute a process of newly attaching information indicating the lot to the part based on information that the product manufacturer can obtain about the part,
For the parts management department of the parts management device,
causing a process to create an instruction to order a lot of the selected parts;
To the picking management department,
causing a process to create instructions for picking a lot of the selected parts;
For the compatibility diagnosis department,
executing a process of reducing the number of types of parts included in the identified combination of parts lots based on the magnitude of dispersion in the rejection rate for each lot of parts;
A parts management program for operating a parts management device characterized by:

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