JP2007109095A - Process management apparatus, process management system, process management method, control program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a process management apparatus capable of reducing costs by quickly detecting and improving the generation of a defect in a production process. <P>SOLUTION: The process management apparatus 2 is provided with: a weight information input control part 21 for acquiring weight information concerned with a work flowing into respective processes in a production line; a process division judgment part 31 for specifying the working time band of each process on the basis of increase/decrease in the real weight of the work; a weight comparison part 33 for comparing the real weight in the specified working time band with a previously supposed weight corresponding to the process of the working time band; a defective product judgment part 34 for judging whether a working object in the working time band is a good product or a defective product on the basis of the comparison result of the weight comparison part 33; and a judged result output means 35 for presenting the judged result to a user. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a process management apparatus, a process management system, a process management method, a control program, and a recording medium that detect a defect of a work object in a production line.

  In general, in production management performed in a factory, quality improvement is an important issue along with productivity improvement. There have been many quality control methods in the past, but the ultimate goal of these methods is to detect defective products at an early stage, avoid producing defective products, and prevent the outflow of defective products. The

  For example, Patent Literature 1 discloses an article excess / deficiency inspection system when goods are shipped together.

  In the above-mentioned article excess / deficiency inspection system, the total weight of all articles actually mixed is measured by a weight measuring device, and the error weight calculated by the difference between the actually measured total weight and the planned total weight of all the articles to be mixed is calculated. Excess or deficiency of the article is inspected depending on whether or not it is within a predetermined error weight range.

This makes it possible to easily check for excess and deficiency of goods when shipping multiple types of articles with different unit weights, and to prevent excess and deficiency of goods due to human factors and shipping mistakes before shipping. Is possible.
JP-A-2004-279240 (released on October 7, 2004)

  However, if the excess / deficiency inspection system disclosed in Patent Document 1 is applied to, for example, part shortage detection in the part assembly process, the following problems occur. Specifically, it is possible to detect a missing part (defective product) of a part by detecting that the weight of the final product is not more than the standard value range. However, if a missing item is detected at the stage of the final process as described above, if you try to find out which part you forgot to assemble, by disassembling the defective product in the reverse order of assembly, We must look for missing parts. Such reworking is even more expensive.

  The present invention has been made in view of the above-described problems, and the purpose thereof is a process management apparatus, a process management system, and the like that can detect occurrence of defects early in the work process and reduce repair costs, To realize a process management method, a control program, and a recording medium.

  In order to solve the above problems, the process management apparatus according to the present invention is based on weight information acquisition means for acquiring weight information on a work object flowing through each process of the production line, and on the increase or decrease of the actual weight of the work object. A work specifying means for specifying the work time zone of the process, a weight comparison means for comparing the actual weight in the specified work time zone and a preset assumed weight associated with the work time zone; Based on the comparison result of the weight comparison means, there is provided a failure determination means for determining the quality of the work object in the work time zone, and a determination result output means for presenting the determination result of the failure determination means to the user. It is characterized by having.

  According to the above configuration, the weight information acquisition unit acquires the weight information about the work object, and the work specifying unit detects the increase / decrease in the actual weight of the work object and specifies the work time zone of the process. Next, the weight comparison means compares the actual weight actually measured in the specified work time zone with an assumed weight set in advance in association with the work time zone. The assumed weight means an ideal weight to be taken when the work object is being worked, and is set for each work time zone. For example, in the assembly process, it can be set from the weight of each component to be assembled and the procedure for assembling those components. Or when the process of the specified work time zone is known in advance, an assumed weight may be set for each process. Therefore, for example, when the defect determination means detects that the actual weight is different from the assumed weight, that is, the ideal weight, as a result of the comparison of the weights, the work object in the work time zone is detected. It is determined that a defect has occurred. This determination result is presented to the user by the determination result output means.

  The good / bad determination result output by the determination result output means corresponds to the work time zone specified by the work specifying means. Therefore, when the defect determination means detects a defect of the work object, it becomes clear whether the defect has occurred in the work time zone.

  Therefore, the user can immediately grasp the process where a defect has occurred from the above work hours and respond quickly, and as a result, in the production process, the defect can be detected early and the repair cost can be reduced. It becomes possible to do.

  The process management apparatus further includes process specifying means for specifying a process in a work time zone specified by the work specifying means, and the weight information acquisition means is a work target for each process of the production line as the weight information. The actual weight of the work object measured every time and the measurement time are acquired, and the work specifying means detects that the actual weight of the work object is stable for a certain period of time, and the actual weight is not stable. A time zone is specified as the work time zone, and the weight comparison means is preset in association with the actual weight of the work time zone specified by the work specification means and the specific process specified by the process specification means. The defect determination means may determine whether the work object is good or bad before the specific process by comparing with the assumed weight.

  According to the above configuration, the work specifying means acquires weight information measured for each work object, and specifies a time zone in which the weight is stable and stable based on an increase or decrease in the weight of the work object. To do. Assuming that this stable time zone is a residence time zone between processes, a time zone other than the above time zone, that is, a time zone in which the weight is not stable is specified as a work time zone. Next, the process specifying means specifies which process the work time zone belongs to. As a method for specifying the process, for example, the detected work time zone is counted as the number of work time zones after the start of the measurement of the weight of the work object, or the process at the time. By associating and recording, it may be possible to specify the process according to the time of the work time zone.

  The weight comparing means compares the measured actual weight of the work object with the assumed weight of the specific process specified by the process specifying means in the work time zone. The assumed weight is calculated in advance from the work procedure on the production line or, for example, the weight of the parts to be assembled, and is set in advance for each process.

  The defect determination means determines the quality of the work object in the work time zone based on the comparison result of the weight comparison means. As a specific determination method, for example, when the actual weight is equal to or greater than a predetermined value and less than the assumed weight, it may be determined that there is a part that has been forgotten to be assembled to the work target. . The determination result output means presents to the user the determination result of the defect determination means in the process specified by the process specifying means.

  Therefore, whenever the weight information is input to the process management device and the work specifying means specifies the work time zone, the comparison between the actual weight of the weight comparing means and the assumed weight and the good / bad judgment of the defect judging means are performed. Done. More specifically, for example, in the component assembling process, it may be possible to determine the presence or absence of a component shortage.

  As a result, when an error in the work procedure, for example, a missing part is detected, it is clear that the assembly of the part has occurred in the specific process specified by the process specifying means. It is possible to present information to the user as to which process the component shortage has occurred.

  Therefore, the user can immediately recognize the process in which the defect has occurred and respond quickly, and as a result, the defective product can be found early in the work process and the repair cost can be reduced. Become.

  Alternatively, the process management device further includes process identification means for identifying which process the weight information acquired by the weight information acquisition means belongs to, and the weight information acquisition means uses the production line as the weight information. The actual weight of the arrangement place where the work object is arranged and the measurement time, which are measured for each process, are acquired, and the work specifying means varies the actual weight of the arrangement place from the weight when not working. The start time and the end time that fluctuates to the weight at the time of non-work are detected, the time from the start time to the end time is specified as the work time zone, and the weight comparison means is specified by the work specification means. The actual weight of the working time zone to be compared with a preset assumed weight associated with the identification process identified by the process identification means, the defect determination means, The good or bad of the work object may be determined.

  According to the above configuration, the weight information acquisition means acquires weight information for each process, and the process identification means identifies which process the weight information belongs to. Next, the work specifying means detects a change in the actual weight of the placement location, more specifically, a start time that changes from the weight when not working, and an end time that changes to the weight when not working, The work time zone is specified from the start time to the end time.

  Subsequently, the weight comparison means compares the actual weight of the work time zone specified by the work specification means with a preset assumed weight associated with the identification process identified by the process identification means. The assumed weight is a weight assumed at the time immediately before the operation in the identification process is finished and discharged. For example, in the case of an assembling process, the assumed weight is calculated in advance for each process from the procedure of assembling work and the weight of parts to be assembled.

  The defect determination means determines the quality of the work object in the identification step based on the comparison result of the weight comparison means. As a specific determination method, for example, when the actual weight is equal to or more than a predetermined value and less than the assumed weight, it is determined in the identification step that there is a part that has been forgotten to be assembled to the work target. Can be considered. The determination result output means presents the determination result of the defect determination means to the user.

  Therefore, whenever the weight information is input to the process management device and the work specifying means specifies the work time zone, the comparison between the actual weight of the weight comparing means and the assumed weight and the good / bad judgment of the defect judging means are performed. Done. More specifically, for example, in the component assembling process, it may be possible to determine the presence or absence of a component shortage.

  As a result, when a defect such as a part shortage is detected, it is clear that the defect has occurred in the process identified by the process identification means, and the determination result output means has a defect in which process. It is possible to present information to the user.

  Therefore, the user can immediately recognize the process in which the defect has occurred and respond quickly, and as a result, the occurrence of the defect can be detected early in the work process, and the repair cost can be reduced. Become.

  Further, the weight comparison means compares the actual weight at the end time detected by the work identification means with the assumed weight set in advance as the weight when the work object is discharged from the identification step. And it is preferable that the said defect determination means determines the quality of the said work target object in the said identification process.

  According to the above configuration, the work specifying means detects a change in the actual weight of the placement location, and specifies the end point when the weight has changed to the weight at the time of non-work as a process break, that is, a process end point. .

  Subsequently, the weight comparison unit is configured to set a discharge time set in advance as an actual weight at the end time specified by the work specifying unit and a weight of an arrangement place immediately before the work object is discharged from the identification process. Compare the expected weight of The assumed weight at the time of discharge is the estimated weight at the time of discharge assumed at the time immediately before the discharge in the identification process. For example, in the case of an assembling process, the assumed weight is calculated in advance for each process from the procedure of assembling work and the weight of parts to be assembled.

  The defect determination means determines the quality of the work object in the identification step based on the comparison result of the weight comparison means. As a specific determination method, for example, when the actual weight is equal to or greater than a predetermined value and less than the assumed weight, it is determined that there is a part that has been forgotten to be assembled to the work target in the process. Can be considered. The determination result output means presents the determination result of the defect determination means to the user.

  Therefore, whenever the weight information is input to the process management device and the work specifying means specifies the end point, the comparison between the actual weight at the end of the weight comparison means and the estimated weight at the time of discharge and the good / bad of the defect determination means Is determined.

  As a result, when a defect is detected, it becomes clear that the defect has occurred in the process identified by the process identification unit, and the determination result output unit provides information on which process the defect has occurred to the user. Can be presented.

  Therefore, the user can immediately recognize the process in which the defect has occurred and respond quickly, and as a result, the occurrence of the defect can be detected early in the work process, and the repair cost can be reduced. Become.

  The weight comparison means further compares the actual weight at the start time detected by the work identification means with the assumed weight set in advance as the weight when the work object is input to the identification process. And it is preferable that a defect determination means determines the quality of the said work target object in the process before the said identification process.

  According to the above configuration, the work identification means compares not only the weight at the end of the process but also the weight at the start of the process with the assumed weight at the time of input, and thus occurs at the stage prior to the identification process. Defects can be detected.

  Further, the process management device acquires the start time and end time of the work time zone of the process specified by the work specifying means, and measures the work time of the process from the difference between the start time and the end time. It is preferable to include working time measuring means.

  Thereby, it becomes possible to measure the work time of the process concerning the said work time zone.

  The work time measuring means acquires the end time of the first weight stabilization time zone detected by the work specifying means as the process start time, and then the second weight stabilization time specified by the work specifying means. It is also possible to obtain the belt start time as the process end time and calculate the work time of the process from the difference between the process start time and the process end time.

  Thereby, the working time of each process concerning one work can be calculated. For example, by accumulating the work time of each process, it is possible to accurately calculate the work time required until one work is completed without shifting work tying. The calculated work time becomes useful information when analyzing the production capacity of the production line in production management, for example.

  Alternatively, the work time measuring means further determines the process start time at the start time specified by the work specifying means and the process end time at the end time specified by the work specifying means next to the start time. It is also possible to obtain the work time from the difference between the process start time and the process end time.

  Thereby, the working time which occurs in one process can be calculated. For example, if the work time is accumulated, the accumulated work time of all work performed in the process can be calculated. The calculated work time becomes useful information when analyzing the production capacity of the production line in production management, for example.

  The process management device further acquires initial weight information of a work object input to the head process of the production line, extracts product type information recorded in association with the initial weight information, and Type identification means for identifying the type of the work object may be provided, and the weight comparison means may acquire an assumed weight of each step for each type identified by the type identification means and compare it with an actual weight. .

  When multiple types of products are produced on a single production line, the assumed weight varies depending on the product at the stage of each process, so it is necessary to quote the correct assumed weight for each product produced, that is, for each model. is there.

  Therefore, according to the above configuration, the initial weight of the work object to be input to the leading process is acquired, and the type identifying means identifies which product will be produced from the difference in the initial weight. The assumed weight is recorded in advance for each model. When the comparison is performed, the weight comparison unit obtains a proper assumed weight based on the identified model and compares it with the actual weight.

  As a result, even when a plurality of types of products are produced on one production line, it is possible to appropriately determine whether the product is good or bad for each model. As a result, in the work process, it is possible to detect the occurrence of defects at an early stage and reduce the cost of repair.

  The assumed weight is calculated for each process based on the part weight indicating the weight of each part to be assembled to the work object to be assembled and the order of assembling the parts. When the weight is smaller than the assumed weight, it is preferable to determine that a part shortage has occurred.

  The fact that the actual weight is smaller than the assumed weight means that an appropriate part has not been assembled in the process. According to the above configuration, since the defect determination means detects that the actual weight is less than the assumed weight, it is possible to detect parts shortage at an early stage in the assembling process, and to reduce the repair cost.

  In addition, it is calculated for each process based on the part weight indicating the weight of each part to be removed from the work to be disassembled and the order of removing the parts, and the failure determination means determines the difference between the actual weight and the assumed weight. May be determined that an error has occurred in the disassembling procedure of the work object.

  According to the above configuration, when the difference between the actual weight and the assumed weight is equal to or greater than a predetermined value, that is, when the estimated weight is outside the allowable range, the defect determination means is disassembled applied to the work object. Detect that work is not appropriate.

  This makes it possible to detect mistakes such as different parts being mistakenly disassembled at an early stage in the product disassembly process, and to reduce the cost of rework.

  In addition, based on the weight information acquired from the weight measuring unit that measures the weight related to the work target flowing through each process of the production line and generates weight information, the quality of the work target is determined. By establishing a process management system that can detect defective products at an early stage and reduce rework costs in the work process by connecting the above-described process management apparatus that performs determination for each process in a communicable manner. It becomes possible.

  Further, when the weight measuring unit measures the actual weight of one work object over each process of the production line, the process determines the quality of the work object based on the weight information of the work object. It becomes possible to construct a process management system for each process.

  Alternatively, when the weight measuring unit measures the actual weight of the place where the work object is placed for each process of the production line, based on the weight information of the place where the process is placed, It becomes possible to construct a process management system for determining whether the work object is good or bad.

  In order to solve the above problems, the process management method according to the present invention is based on a first step of acquiring weight information regarding a work object flowing through each process of the production line, and an increase / decrease in the actual weight of the work object. A second step of identifying the work time zone, and a third step of comparing the actual weight in the identified work time zone with a preset assumed weight associated with the work time zone process, And a fourth step of determining whether the work object is good or defective in the work time period based on the comparison result of the weight comparison means, and a fifth step of presenting the determination result of the defect determination means to the user. It is characterized by that.

  According to the above method, based on the weight information on the work object acquired in the first step, in the second step, the time zone other than the time zone in which the weight is stabilized is specified as the work time zone from the increase / decrease in the weight. . In a subsequent third step, the assumed weight of the preset work object associated with the process related to the specified work time zone is compared with the actual weight of the work object in the work time zone.

  Next, in the fourth step, the quality of the work object in the specified process is determined based on the comparison result in the third step. Finally, the determination result of the fourth step is presented to the user in the fifth step.

  Thereby, when a defect is detected in the fourth step, it becomes clear that the defect process has occurred in the specified work time zone, and in any work time zone in the fifth step, the defect is detected. It is possible to present information to the user as to whether it has occurred.

  Therefore, the user can immediately identify the process in which the defect has occurred from the information on the work time zone, and can quickly cope with it. Can be reduced.

  The process management method according to the present invention includes a first step of acquiring an actual weight of a work object and a measurement time measured for each work object over each process of the production line, and the first step. A second step of detecting that the weight of the work object is stable for a certain period of time based on the obtained increase / decrease of the actual weight and identifying a time zone in which the weight is not stable as a work time zone; As the weight of the work object associated with the third step for specifying the process related to the work time zone specified in two steps, the actual weight of the work time zone, and the specific process specified in the third step A fourth step for comparing the assumed weight set in advance, and a fifth step for determining whether the work object is good or bad in the specific step based on the comparison result in the fourth step; It may include a sixth step of presenting to a user the judgment result.

  In this case, if a defect is detected in the fifth step, it is clear that the defective process occurred in the specified specific process, and in which process the defect occurred in the sixth step. This information can be presented to the user.

  Therefore, the user can immediately recognize the process in which the defect has occurred and respond quickly, and as a result, it is possible to detect the occurrence of the defect early in the work process and reduce the repair cost. Become.

Alternatively, in the process management method according to the present invention, the first step of obtaining the actual weight of the arrangement place where the work object is arranged and the measurement time, which are measured for each process of the production line, and the first step are obtained. The second step for identifying at which process arrangement location the actual weight obtained in (2) above is measured, and the actual weight at the location of the identification process identified in the second step is changed to the weight at the time of non-working. The third step of detecting the fluctuation and specifying the time when the actual weight fluctuates as the process end time when the work of the process ends, and the actual weight at the end of the process specified at the third step A fourth step of comparing the assumed weight set in advance as the weight of the placement location immediately before the work object is discharged from the identified process;
Based on the comparison result in the fourth step, the identification step may include a fifth step for determining good / bad for the work object and a sixth step for presenting the determination result to the user. Good.

  In this case, if a defect is detected in the fifth step, it is clear that the defect has occurred in the identification process identified in the second step, and in which process the defect occurs in the sixth step. It is possible to present information on whether or not it has been performed to the user.

  Therefore, the user can immediately recognize the process in which the defect has occurred and respond quickly, and as a result, it is possible to detect the occurrence of the defect early in the work process and reduce the repair cost. Become.

  The process management apparatus may be realized by a computer. In this case, a control program for the process management apparatus for causing the process management apparatus to be realized by a computer by operating the computer as the respective means, and A computer-readable recording medium on which is recorded also falls within the scope of the present invention.

  The process management apparatus according to the present invention specifies a work time zone of a process based on weight information acquisition means for acquiring weight information regarding a work object flowing through each process of a production line, and an increase / decrease in the actual weight of the work object. Comparison of the work comparison means, the weight comparison means for comparing the actual weight in the specified work time zone, and the preset assumed weight associated with the process in the work time zone, and the weight comparison means On the basis of the result, there are provided a defect determination means for determining whether the work object is good or defective in the work time zone, and a determination result output means for presenting the determination result of the defect determination means to the user.

  As a result, when a defect, for example, a missing part is detected, it is possible to identify the work time zone in which the missing part has occurred and present information to the user.

  Therefore, the user can immediately identify the process in which a part shortage has occurred from the above work time period and respond quickly, and as a result, the occurrence of defects can be detected early in the work process, and the repair cost can be reduced. There is an effect that can be reduced.

Embodiment 1
Each embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, as an example, a process management system applied to a production system having a hand-assembled production line composed of four processes will be described.

[Outline of process control system 1]
In the following, for simplification of description, a configuration in which one production line is monitored by one process management apparatus and each process of the production line is handled by one worker will be described.

  First, a product production system 1 to which the process management system 100 according to the present embodiment is applied will be described with reference to FIG. In the example shown in FIG. 2, the production system 1 includes a production line including four processes (A to D processes) for manufacturing a product by an operator's manual work, and a process management device 2 that manages the work of each of the above processes. The weight measuring unit 3 that measures the weight of the work-in-process (work) flowing through the production line is configured.

  Work-in-process (initial workpiece Wo), which is a manufacturing object of the production system 1, is in the order of the A process, the B process, the C process, and the D process as works (work objects) Wa to Wd from upstream to downstream. When the operations of all the steps are sequentially performed through the respective steps, the product (work Wd) is completed. In the present embodiment, it is assumed that one work flows through a process for one order, and one work is executed for each process.

  About the weight measurement part 3 for measuring the weight of a workpiece | work, in this embodiment, the one weight measurement part 3 is installed corresponding to one workpiece | work. As shown in FIG. 2, the weight from when the workpiece is input to the first step (A step) to when the last step (D step) is discharged is given to the carriage (or pallet or the like) on which the workpiece is placed. The installed weight measuring unit 3 measures. The weight information measured by the weight measuring unit 3 is supplied to the process management device 2 together with the measurement time.

  By acquiring the weight information in real time, the process management device 2 can quickly perform various processes such as part shortage detection and work time measurement.

  In this embodiment, the weight measuring unit 3 is realized, for example, by attaching a strain sensor on a pallet on which a workpiece is placed or a carriage. The strain sensor applies a load to a specimen and acquires the amount of strain depending on the degree of deformation.

  Thus, the structure which installs the weight measurement part 3 in a trolley | bogie or a pallet can apply the process management system 100 of this invention to the production system 1 under the following conditions, for example. Specifically, when a workpiece to be weighed is large or heavy, the workpiece is not moved to each work place of the process, but the person in charge of each process places the above-mentioned workpiece on the cart There may be a case where the work is carried out by moving to (pallet). Alternatively, the present invention can also be applied to a case where each work is moved while being placed on a carriage (pallet) from when the work is input to the first process until the last process is discharged.

  The process management device 2 and the weight measuring unit 3 are connected to each other via a communication line, thereby forming a wireless or wired communication network. Thereby, the weight measuring unit 3 can transmit the measured weight information to the process management device 2.

  The communication network may be any network as long as the transmission source apparatus can transmit the information of the own apparatus to the transmission partner. For example, a form in which a wireless LAN (Local Area Network) realized by infrared rays, Bluetooth (registered trademark), or the like is formed is assumed.

  In the present embodiment, one worker is assigned to each process, and a work place and a work procedure for each process (A to D processes) are defined. In addition, work tables are installed at the respective work places, and jigs and tools necessary for assembling and manufacturing products used by the workers are arranged. Or the production equipment which an operator operates may be installed.

  Further, in this embodiment, all the processes of the production system 1 are hand-assembled lines by manual work by an operator. However, the present invention also applies to a production system including a process in which assembly and production are automatically performed by a production facility. It is possible to apply the process management system 100.

[Configuration 1 of process control device]
FIG. 1 is a block diagram showing a main configuration of a process management apparatus 2 according to the present embodiment. As shown in FIG. 1, the process management device 2 includes a receiving unit 4, an output unit 5, an operation unit 6, a control unit 10, and a recording unit 40. The control unit 10 further includes an input / output control unit 11 and a process management control unit 12, and the recording unit 40 further includes a weight information recording unit 41, a threshold recording unit 42, a progress information recording unit 43, and A work-in-progress weight database (hereinafter referred to as DB) 44 is included.

  The receiving unit 4 receives transmission data from other devices in the process management system 100 (FIG. 2). The receiving unit 4 receives, for example, workpiece weight information from the weight measuring unit 3 installed on the carriage.

  The output unit 5 presents various processing results of the process management apparatus 2 to the user, and includes a sound generation unit 5a that outputs sound and a display unit 5b that displays the processing results. The sound generation unit 5a is for alerting the user by generating a warning sound when the process management device 2 detects an abnormality in the production system 1, and is configured by, for example, a speaker. The display unit 5b displays various processing results such as a result of determining whether there is a shortage in the process management device 2 and a work time measurement result. For example, a display device such as a liquid crystal display device or a CRT (Cathode Ray Tube). Consists of.

  The operation unit 6 receives an instruction input from the user, information input, and the like, and includes, for example, a key input unit such as a keyboard and buttons, a pointing device such as a mouse, and the like.

  The input / output control unit 11 of the control unit 10 controls input / output of information in the process management apparatus 2, and includes a weight information input control unit (weight information acquisition unit) 21, a shortage determination result output control unit 22, and The operation receiving unit 23 is provided.

  The weight information input control unit 21 performs control for acquiring the weight information received by the receiving unit 4 from the weight measuring unit 3. The missing item determination result output control unit 22 performs control for displaying the processing result of the missing item determination unit (defective determination unit) 34 on the display unit 5b. The operation receiving unit 23 receives an instruction signal from the user input to the process management apparatus 2 via the operation unit 6 and supplies the instruction signal to each unit of the process management control unit 12.

  Next, each part of the process management control unit 12 will be described in detail.

  The process management control unit 12 controls various processes for process management including a part shortage detection process and a work time measurement process in the process management apparatus 2, and a process break determination unit (work specifying unit) 31. , A process progress determination unit (process progress determination unit) 32, a weight comparison unit (weight comparison unit) 33, a shortage determination unit 34, and a determination result output unit (determination result output unit) 35.

  The process break determination unit 31 specifies the time zone (work time zone) in which work related to the process is performed from the weight information acquired from the weight measurement unit 3 and the measurement time by determining whether there is a process break. Then, the start (or end) time of each process is acquired from the specified work time zone. More specifically, in this embodiment, a time zone in which there is no fluctuation in weight is regarded as a stable state, that is, a residence time between processes. Therefore, if the process break determination unit 31 determines that there is no change in weight over a certain period of time, the stay time is regarded as a process break, and the start time of the stay time is set as the end time of the immediately preceding process, The end time of the residence time is acquired as the start time of the next process.

  The process progress determination unit 32 determines, based on the process delimiter information specified by the process delimitation determination unit 31, to which process the workpiece whose weight measurement unit 3 measures the weight is currently progressing. To do. For example, in the production system 1 of FIG. 2, when the process delimiter determining unit 31 has already acquired weight information from the weight measuring unit 3 and has already specified a delimiter (stable state) between two processes, the process progress determining unit 32, it is determined that the workpiece is somewhere from the time when it is input to the C process through the process A and the process B until immediately before it is input to the process D. Thereby, it can also be determined which step after which the stable state indicates the residence time.

  The weight comparison unit 33 compares the actual weight of the workpiece measured by the weight measurement unit 3 during the inter-process residence with the assumed weight of the work-in-process (work) that has been registered in advance and immediately after the process is discharged. is there. Specifically, the weight comparison unit 33 first acquires the actual weight of the workpiece at the step separation (during residence) specified by the step separation determination unit 31. Next, the process progress determination unit 32 acquires information about which process is immediately after the process. And the assumed weight of the work in process immediately after the process discharge | emission designated by the process progress determination part 32 is acquired from the information of the assumed weight for every process registered beforehand. The comparison result between the actual weight of the workpiece and the assumed weight of the work in process is supplied to the shortage determination unit 34.

  The out-of-stock determination unit 34 determines the presence or absence of a component shortage in each assembly process of the production system 1 according to the weight comparison result by the weight comparison unit 33. If parts are forgotten to be assembled due to human error, or assembly errors occur due to malfunctions in production equipment, the actual weight of the workpiece will be lower than the expected weight of the work in progress. The missing part determination unit 34 detects this weight error, and when the actual weight falls below the assumed weight, for example, if the error is larger than a predetermined value, it is determined that there is a part missing part. . That is, it is determined that component assembly omission has occurred in the process specified by the process progress determination unit 32.

  The determination result output unit 35 outputs the determination result made by the shortage determination unit 34. The determination result is output to the output unit 5 via the shortage determination result output control unit 22. For example, if it is determined that there is a missing part, a warning sound is emitted from the sound generation unit 5a, so that the user can recognize the missing part in real time and take a quick action. Further, if the determination result is output to the display unit 5b each time, the user can know in which process the part shortage has occurred (or has not occurred).

  Next, details of the recording unit 40 (FIG. 1) for the process management control unit 12 to perform reading and writing when various processes are executed will be described.

  The weight information recording unit 41 of the recording unit 40 records the workpiece weight information measured by the weight measuring unit 3 shown in FIG. 2 in association with the measurement time. The threshold value recording unit 42 records a threshold value that each unit of the process management control unit 12 refers to when executing various determinations. For example, the process delimiter determination unit 31 records a delimiter threshold that is referred to when specifying a process delimiter based on the transition of the weight of the workpiece. For example, if the separation threshold is recorded as “1 minute”, the process separation determination unit 31 can determine that the residence time is the separation of the process when it is determined that there is no change in the weight for 1 minute or more. .

  Further, based on the error calculated by the weight comparison unit 33, the shortage determination unit 34 records an error threshold to be referred to when determining the presence or absence of a component shortage. For example, if the error threshold is recorded as “1 g”, when the actual weight falls below the assumed weight by 1 g or more, the missing part determination unit 34 determines that there is a missing part. Note that the error threshold is set to be equal to or less than the minimum weight of the minimum unit part constituting the product. As a result, no matter what parts are missing, the shortage determination unit 34 can avoid overlooking it.

  The weight information recorded in the weight information recording unit 41 and the measurement time can be shown, for example, in the graph of FIG. FIG. 3 is a graph showing the relationship between the passage of time and the weight until the initial workpiece Wo is completed through the respective steps (A to D) in the production system 1 of FIG. The horizontal axis of Grph1 indicates the passage of time, and the unit is represented by “minute”. S indicates the start time of each step, and E indicates the end time. The vertical axis indicates the actual weight of the workpiece measured by the weight measuring unit 3, and the unit is represented by “kg”. It is assumed that the weight is measured from the time when the workpiece is input to the A process (point P) to the time when the work is discharged from the D process (point W).

  The production system 1 operates, and assembly work is performed from point P to point Q on the workpiece in the process A. Therefore, the weight of the initial workpiece Wo increases as the parts are assembled. After passing the point Q at which the process A ends, the process delimiter determination unit 31 detects that the weight has changed, and when the stable state has continued for more than 1 minute from the point Q at which the stable state has started. Therefore, it is determined that this is the residence time (r) immediately after the first step (step A). Similarly, between the points S-T and between the points U-V, the residence time immediately after the B process and the C process is specified. Therefore, the process management apparatus 2 can specify the start time (S) of the B process from the end time of the residence time immediately after the previous process (A process), for example. In addition, since measurement is complete | finished when D process is complete | finished, the process division | segmentation determination part 31 shall recognize the time when measurement was complete | finished as a residence start time (immediately after D process).

  The progress information recording unit 43 records information on the residence time acquired by the process delimiter determination unit 31 as described above, that is, the start / end times of the time zone specified for the residence time and the weight of the workpiece in the time zone. Is. Further, for each recorded residence time zone, process progress information indicating which process the residence time is immediately after is recorded. The process progress information is specified by the process progress determination unit 32 as described above.

  FIG. 4 is a diagram illustrating an example of progress information for each process break (dwelling time zone) specified by the process break determination unit 31 and recorded in the progress information recording unit 43. The progress information can be expressed in a table structure as shown in FIG. 4, for example. The first column (C1) has a start time of the acquired residence time zone, the second column (C2) has an end time of the residence time zone, and the third column (C3) has a work time of the residence time. The weight is stored. The fourth column (C4) stores information indicating which process the residence time is immediately after.

  Information on the columns C1 and C2 is generated by the process delimiter determining unit 31, information on the column C3 is generated by the weight comparing unit 33, and information on the column C4 is generated by the process progress determining unit 32.

  The progress information table shown in FIG. 4 shows progress information when the time when the A process is started is 9:00, using the example of Grph1 shown in FIG. The first record R1 is added at the time when the weight measurement of the workpiece is started (step A is started).

  For example, from the second record R2, it can be seen that the first step (step A) was completed at 9:01 and the next second step (step B) was started at 9:02. . Further, it can be seen that the weight of the workpiece is 20 kg when the first step is completed.

  The process progress determination unit 32 specifies which process is between the processes for the process breaks extracted as described above. More specifically, in the present embodiment, information (the total number of processes, the order of each process, etc.) of the production system 1 to which the workpiece that is a weight measurement target belongs is registered in advance. Then, after the measurement is started, a process that is completed immediately before the process delimiter (dwelling time zone) is specified based on the order specified as the process delimiter.

  For example, since the second record R2 in FIG. 4 is a delimiter of the process specified for the first time, the process progress determination unit 32 indicates that the record R1 is a residence time zone between the A process and the B process. The information indicating the A process is stored as the “immediate end process” (fourth column (C4)). Thereby, it turns out that the actual weight of the workpiece | work Wa immediately after A process discharge | emission is 20 kg.

  The work-in-progress estimated weight DB 44 records the weight of work in progress (work) of the product produced by the production system 1 as an assumed weight for each process. FIG. 5 is a diagram illustrating an example of work in progress estimated weight information for each process of the production system 1 (FIG. 2) recorded in the work in progress estimated weight DB 44. Estimated weight is the ideal weight by estimating the weight of the work at which stage of the work, based on the work procedure defined in the production system 1 and the weight of all parts to be assembled. Is the weight registered as. That is, it is considered that the greater the difference (error) between the actual weight measured by the weight measuring unit 3 and the assumed weight recorded in the work-in-progress estimated weight DB 44, the higher the possibility that the assembling work has been erroneous. it can. In particular, when the actual weight is lower than the assumed weight, it can be considered that a part shortage has occurred.

  According to the work-in-progress weight information shown in FIG. 5, for example, the assumed weight immediately after the process A is 20 kg, and as shown in FIGS. 3 and 4, the actual weight immediately after the process A is 20 kg. The missing part determination unit 34 can determine that no part missing part has occurred in the process A.

  According to the above configuration, the process delimiter determining unit 31 acquires the weight information of the workpiece from the weight measuring unit 3, and based on the change in the weight of the workpiece, a time zone in which there is no change in the weight is retained between the processes. It is specified as a time, that is, a step separation. Next, the process progress determination unit 32 determines whether or not the process break is determined by the number of breaks after the weight measurement unit 3 starts measuring the weight of the workpiece. The process immediately before and after which process is specified is specified.

  The weight comparison unit 33 compares the actual weight of the workpiece measured by the weight measurement unit 3 with the assumed weight in the immediately preceding process in the residence time zone as a break of the process. The assumed weight is calculated in advance for each process from the procedure of the assembling work and the weight of the parts to be assembled. When the actual weight is equal to or greater than a predetermined value and less than the assumed weight, the missing part determination unit 34 determines that there is a part that has been forgotten to be assembled to the workpiece. The determination result output unit 35 presents the determination result of the shortage determination unit 34 to the user.

  Therefore, whenever weight information is input from the weight measuring unit 3 to the process management device 2 and the process delimiter determining unit 31 specifies a process delimiter, the weight comparison unit 33 compares the actual weight with the assumed weight, The product determination unit 34 determines whether there is a missing part.

  As a result, when a component shortage is detected, it becomes clear that the assembly failure of the component has occurred in the process immediately before the specified residence time period, and the determination result output unit 35 determines which process component It is possible to present information to the user as to whether a shortage has occurred.

  Therefore, the user can immediately recognize the process in which the part shortage has occurred and respond quickly, and as a result, in the assembling process, defective products can be found early and repair cost can be reduced. It becomes possible.

  Furthermore, the process management apparatus 2 according to the present invention includes a work time measurement unit (work time measurement means) 13 in the control unit 10, and thus relates to a workpiece that is a weight measurement target based on the acquired weight information. The work time can be calculated.

The work time measuring unit 13 refers to the progress information recording unit 43, and can obtain the start time and end time of the process in which the work is performed on the workpiece, for example, from the progress information shown in FIG. That is, from the example of FIG.
Process A start time 9:00, end time 9:01
Process B start time 9:02, end time 9:03
Process C start time 9:05, end time 9:07
D process start time 9:09, end time 9:10
To get.

  Next, the work time measuring unit 13 calculates a work time for each process. From the difference between the above start and end times, the work time of each process is calculated as A process work time 1 minute, B process work time 1 minute, C process work time 2 minutes, and D process work time 1 minute. Thereby, the work time measuring unit 13 calculates the accumulated work time related to the workpiece as 5 minutes, and outputs the calculation result to the display unit 5b via the work time output control unit 24 (FIG. 1).

  According to the said structure, based on the weight information of the workpiece | work which the weight measurement part 3 measures, the time of the division | segmentation of a process can be acquired from transition of a weight. Thereby, it becomes possible to measure the work time for each process related to the work and the accumulated work time of the work.

  As a method for calculating the work time in the hand-assembled line, for example, sensing the movement of an object such as a workpiece with a photoelectric sensor or the like, detecting a process break, and measuring the time can be considered. However, in the case of a work method in which work is performed while the work is placed at the same location as in this embodiment, it is difficult to calculate the work time because the movement of the work cannot be detected. However, according to the above configuration, even in a hand-assembled line in which the workpiece does not move, it is possible to specify a process break and calculate a work time based on a change in the weight of the workpiece.

  Furthermore, according to the process management system 100 of the present embodiment, since the same weight measuring unit 3 measures the weight of one work from the beginning to the end of the production process, There is no deviation in the tying. Therefore, in the production system 1, even when a plurality of workpieces are simultaneously produced for a plurality of orders, the work time calculated for each process is not erroneously calculated as the work time of different workpieces. Such accumulated work time can be calculated without error.

[Modification]
In this embodiment, the case where one product (work) is produced on one production line has been described for the sake of simplicity. However, the process management system 100 according to the present invention is not limited to the above-described example, and can be applied to a case where a plurality of workpieces are handled simultaneously on one production line.

[Process management system that handles multiple workpieces of the same type]
When working on multiple workpieces simultaneously on one production line, in order to know which weight measuring unit is measuring the weight of which workpiece, correspondence information between the weight measuring unit 3 and the workpiece is provided. The process management device 2 needs to recognize.

  In the present embodiment, the process management device 2 may further include a correspondence information recording unit 45 (FIG. 1) in the recording unit 40.

  In the correspondence information recording unit 45, for example, a table showing the correspondence between the device ID of the weight measuring unit 3 and the work ID is recorded. Thereby, the process division | segmentation determination part 31 acquires apparatus ID which shows the weight information from which weight measurement part 3 simultaneously, when acquiring weight information. Thereby, weight information can be recorded in the weight information recording part 41 for every workpiece | work based on apparatus ID.

  Accordingly, the progress information recorded in the progress information recording unit 43 is also recorded for each work. That is, the weight of the work (work in process) acquired from the weight information recording unit 41 in the staying time zone is also recorded for each work.

  As a result, the presence or absence of missing parts is determined for each workpiece, and when a missing part is detected, the judgment result indicating which part has run out for which work is presented to the user. It becomes possible to do. Therefore, it is possible to apply the process management system 100 of the present invention even in a production line that performs work on a plurality of workpieces, and it is possible to transmit a workpiece in which a part shortage has occurred to a user without making a mistake. Become.

[Embodiment 2]
In the first embodiment described above, the process management system in which one weight measuring unit measures the weight of one workpiece from the first process to the last process has been described. However, the process management system of the present invention can be constructed as a process management system for detecting a missing part even in a configuration in which a weight measuring unit is installed for each process. Hereinafter, another process management system applied to a production system having a hand-assembled production line composed of four processes will be described.

[Outline of process control system 2]
First, a product production system 1 to which the process management system 200 according to the present embodiment is applied will be described with reference to FIG. In the example shown in FIG. 6, the production system 1 includes a production line including four processes (A to D processes) for manufacturing a product by an operator's manual work, and a process management device 2 that manages the work of each of the above processes. The weight measuring units 3a to 3d for measuring the weight of the workpiece flowing through each process of the production line (in the case where it is not particularly necessary to distinguish between them, simply referred to as the weight measuring unit 3) are included.

  Work-in-process (initial work Wo), which is a manufacturing object of the production system 1, passes through each process from upstream to downstream as works Wa to Wd in the order of A process, B process, C process, and D process. When the operations of all the steps are executed in sequence, a finished product (work Wd) is obtained.

  About the weight measurement part 3 for measuring the weight of a workpiece | work, the point different from the above-mentioned Embodiment 1 is that in this embodiment, one weight measurement part 3a-3d respond | corresponds with respect to one process, respectively. It is a point that has been.

  FIG. 7 is a diagram illustrating an installation example of the weight measuring unit 3 installed in each process. A work table 81a shown in FIG. 7 is a work table for the A process. The weight measuring unit 3a measures the weight of the object on the work table 81a. When the initial workpiece Wo is set on the jig 81b, the total weight (weight information) including the weight of the initial workpiece Wo is supplied to the process management device 2 together with the measurement time. The process management device 2 and the weight measuring unit 3 form a wireless or wired communication network by being connected to each other via a communication line. Thereby, the weight measuring unit 3 can transmit the measured weight information to the process management device 2.

  The process management device 2 can quickly perform various processes such as part shortage detection and work time measurement by acquiring the weight information in real time for each process.

  In the present embodiment, the weight measuring unit 3 is realized by attaching a strain sensor, for example. The strain sensor applies a load to a specimen and acquires the amount of strain depending on the degree of deformation.

  Thus, the structure which installs the weight measurement part 3 in the work bench | platform of each process can apply the process management system 200 of this invention to the production system 1 under the following conditions, for example. Specifically, in the case where assembly work is performed manually by humans, such as cell production, the work is almost always large and heavy enough to be carried by hand. Therefore, if the total weight on the workbench is measured, it is not necessary for the person to measure the weight every time the process is divided, and from the transition of the weight, the weight of the work can be carried or the parts are assembled. It is possible to detect fluctuations.

[Configuration 2 of process control device]
FIG. 8 is a block diagram showing a main configuration of the process management apparatus 2 according to the present embodiment. Note that the reference numerals given to the respective constituent elements in FIG. 8 correspond to the reference numerals given to the respective constituent elements in FIG. 1, and the same reference numerals indicate the same constituent elements. Therefore, the description about the component already demonstrated by the above-mentioned embodiment is not repeated. In the process management apparatus 2 of FIG. 8, the difference from FIG. 1 will be described in detail below.

  The process management apparatus 2 in FIG. 8 includes a process identification unit (process identification unit) 37 instead of the process progress determination unit 32 inside the process management control unit 12, and has a correspondence information recording unit 45 in the recording unit 40. Yes. In the present embodiment, the process management apparatus 2 further includes a work identification unit 38, which will be described later.

  The process identification unit 37 identifies which process work table weight the weight information received from the weight measurement unit 3 is. The correspondence information recording unit 45 records a device ID-process correspondence table indicating a correspondence relationship of which weight measuring unit 3 is installed on a work table of which process.

  In the device ID-process correspondence table, the correspondence between the device ID of the weight measuring unit 3 and the process is recorded. If the process identification unit 37 acquires the device ID of the weight measurement unit 3 that is the weight information supply source, the process identification unit 37 refers to the correspondence information recording unit 45 to identify which process the weight information belongs to. It becomes possible.

  Next, the function of each unit and the details of the recording unit 40 when the process management control unit 12 executes various processes related to process management will be described. Here, a case where weight information is received from the weight measuring unit 3a (FIG. 7) installed on the work table 81a in the A process will be described as an example.

  When the weight information of the work table 81a in the A process is received from the weight measuring unit 3a via the receiving unit 4, the weight information input control unit 21 records the received weight information in the weight information recording unit 41. At this time, the process identification unit 37 acquires the device ID of the weight measurement unit 3a from the received weight information, and recognizes that the acquired weight information belongs to the A process. The weight information recorded in the weight information recording unit 41 may be recorded in association with information for identifying a process.

  The process delimiter determining unit 31 specifies a process delimiter from the weight information recorded in the weight information recording unit 41 and the measurement time, and acquires the start (and / or end) time of each process. . More specifically, in the present embodiment, the time point when the weight varies is regarded as the end of the process. In other words, by lifting the workpiece from the workbench, the total weight on the workbench was reduced to the weight during non-working (when no work was placed on the workbench) (hereinafter referred to as non-working weight). The time is determined as the end time of the process. Furthermore, in order to determine the start of the process, the time when the weight is increased from the non-work weight by placing the work on the work table may be determined as the start time of the process. In this embodiment, it is set as the structure which determines both the start and completion | finish of a process, and performs the weight comparison in both the start and completion | finish time. In the present embodiment, it is assumed that the non-work weight is determined in advance for each process and recorded in the work-in-progress weight DB 44.

  The weight comparison unit 33 is assumed to be registered in advance with the actual weight on the workbench measured by the weight measurement unit 3 at the start (or end) of the process (hereinafter referred to as the actual weight at the start (end)). The weight is compared. When compared with the actual weight at the start, the assumed weight is compared with the weight on the work table when the work is put into the process (hereinafter referred to as the assumed weight at the time of loading). Further, when comparing with the actual weight at the end, the weight is compared with the weight on the workbench immediately before the work is discharged from the process (hereinafter referred to as an assumed weight at the time of discharge). The estimated weight at the time of loading and the estimated weight at the time of discharging are recorded in the estimated work-in-process weight DB 44 for each process together with the weight at the time of non-work.

  The out-of-stock determination unit 34 determines the presence or absence of a component shortage in each assembly process of the production system 1 according to the weight comparison result by the weight comparison unit 33. As a result of the comparison between the actual weight at the start and the estimated weight at the time of loading, if the actual weight at the time of starting is less than the estimated weight at the time of loading, the shortage determination unit 34 Since the weight is equal to or less than the assumed weight, it is determined that there is a part shortage in the previous process. That is, it detects that a part shortage has occurred in the process immediately before the process identified by the process identification unit 37.

  On the other hand, as a result of the comparison between the actual weight at the end and the estimated weight at the time of discharge, if the actual weight at the end is lower than the estimated weight at the time of discharge, the shortage determination unit 34 is about to be discharged. Since the weight of the work to be performed is equal to or less than the assumed weight, it is determined that there is a missing part in the process. That is, it detects that a part shortage has occurred in this process identified by the process identification unit 37.

  The determination result performed as described above is output from the determination result output unit 35 to the output unit 5 via the missing item determination result output control unit 22 and presented to the user.

  The weight information recorded in the weight information recording unit 41 and the measurement time can be shown, for example, in the graph of FIG. FIG. 9 is a graph showing the relationship between the passage of time and the total weight on the work table 81a in step A measured by the weight measuring unit 3a in the production system 1 of FIG. The horizontal axis of Grph2 indicates the passage of time. The vertical axis represents the total weight on the work bench 81a measured by the weight measuring unit 3a, and the unit is represented by “g”.

  According to Grph2, there are 10 weight fluctuations (increase / decrease) from the start of weight measurement at 9:00 to the end of 9:11. You can see that it has passed. As described above, when work is performed on a plurality of workpieces in one production line, it is necessary to identify the workpieces and determine which workpiece has a missing part.

  In the present embodiment, the process management device 2 further includes a work identification unit 38 (FIG. 8) inside the process management control unit 12. Depending on how many processes start and end are detected by the process delimiter determining unit 31 after starting to acquire weight information, the work identification unit 38 determines whether the process start (end) is the process work for which number of workpieces. Identify if there is. That is, in the example shown in FIG. 9, the weight fluctuation peak from the point K to the point L is the first peak after the weight information is acquired, and this is the weight of the first workpiece (W001). Identify as fluctuating.

  The process management device 2 further includes an input unit 7 and an ID input control unit 25 inside the input / output control unit 11, and when a workpiece is input into the process (or discharged), The work ID may be read and supplied to the work identification unit 38. Thereby, the process management apparatus 2 can recognize which weight change corresponds to which workpiece.

  The process delimiter determination unit 31 detects the change in weight and starts the increase (for example, the point K) as the process start time (S), and sets the time when the weight decreases (for example, the point L) as the process. Is identified as the end point (E) of the time, and the time at this point is acquired and recorded in the progress information recording unit 43.

  FIG. 10A is a diagram illustrating an example of progress information generated when the process break determination unit 31 acquires the process start time and the process end time from the weight information illustrated in FIG. 9. Here, what is recorded when the weight variation of the first work (W001), the third work (W003), and the fifth work (W005) shown in FIG. 9 is detected is shown.

  The progress information of the present embodiment has six items. Here, the item “process” is generated by the process identifying unit 37, and the items “process start time” and “process end time” are generated by the process delimiter determining unit 31.

  The weight comparison unit 33 acquires the weight at the acquired time and records it in the progress information recording unit 43 as “starting actual weight” and “ending actual weight”, respectively. The item “work ID” is generated by the work identification unit 38 so that the process management apparatus 2 can identify the work.

  Next, the work-in-progress estimated weight DB 44 will be described. FIG.10 (b) is a figure which shows the example of work-in-process assumption weight DB for the weight comparison part 33 to obtain the assumption weight for comparing with an actual weight in this embodiment. The estimated loading weight and the discharging estimated weight are determined by the non-working weight on the workbench and the weight of the workpiece at each stage. In the example shown in FIG. 10 (b), the non-working weights in the A to D processes are 1000 g, 1200 g, 1300 g, and 1000 g, respectively, and the work weights in the respective stages are the initial work Wo = 100 g and immediately after the A process. The workpiece Wa = 150 g, the workpiece Wb immediately after the B step = 270 g, the workpiece Wc immediately after the C step = 410 g, and the workpiece (completed product) Wd = 580 g immediately after the D step.

  Therefore, “1000 (g)” shown on the vertical axis of FIG. “1100 (g)” indicates the estimated weight when the process A is charged. Further, “1150 (g)” indicates an estimated weight at the time of discharge of the A process.

  The weight h written below 1100 (g) and the weight i written below 1150 (g) are referred to when the missing item determination unit 34 determines the presence or absence of a component missing item. An error threshold value is indicated and recorded in advance in the threshold value recording unit 42. When these error threshold values differ depending on each process, or the error threshold value at the time of input and the error threshold value at the time of discharge, the error threshold value set for each of them may be recorded in the threshold value recording unit 42.

[Operation flow of process control device]
The process flow for detecting a component shortage in the process management apparatus 2 (FIG. 8) according to the present embodiment will be described below with reference to FIG.

  When the process management device 2 acquires the weight information shown in FIG. 9 (S101), the process identification unit 37 indicates which process weight information is based on the device ID of the weight measurement unit 3 that is the supply source of the weight information. Is identified (S102).

  Subsequently, the process delimiter determining unit 31 detects a change in weight from the acquired weight information (Yes in S103). At this time, the workpiece identification unit 38 may identify which workpiece the variation in the weight is (S104). Next, when the change in weight is an increase from the non-working weight, the process break determination unit 31 determines that the time is the start time of the process (A in S105).

  Next, the weight comparison unit 33 calculates the weight (1099.8 g (FIG. 10 (a))) at the time (for example, the point K) specified by the process delimiter determination unit 31 as the start time of the process. On the other hand, the estimated weight (1100 g (FIG. 10B)) at the time of introduction of the process A is acquired from the work-in-progress estimated weight DB 44, and the two are compared (S106).

  Next, the shortage determination unit 34 compares the error between the two with an error threshold (for example, 1 g) from the comparison result of the weight comparison unit 33 (S107). If the error is within 1 g (Yes in S107), it is determined that no parts are missing in the previous process (S108), and the determination result is presented to the user (S109). Conversely, as in the example of point M, in S107, when it is determined that the actual weight at start (1050 g (FIG. 10A)) is 1 g or more lower than the estimated weight at the time of loading (No in S107), It is detected that there is a part shortage in the previous process (S110).

  On the other hand, if the change in weight is a decrease to the non-working weight in S105, the process delimitation determination unit 31 determines that the time is the end of the process (B in S105). Subsequently, the weight comparison unit 33 determines the actual weight at the end when the process delimiter determining unit 31 identifies the end of the process (for example, point L) and the A process recorded in the work-in-progress weight DB 44. The estimated weight at the time of discharge (1150 g (FIG. 10B)) is compared (S111).

  Based on the comparison result of the weight comparison unit 33, the shortage determination unit 34 compares the error between the two with an error threshold (for example, 1 g) (S112). If the error is within 1 g (Yes in S112), it is determined that no part shortage has occurred in the process (S113), and the determination result is presented to the user (S109).

  Conversely, as in the example of point N, in S112, when it is determined that the actual weight at the end (1130 g (FIG. 10A)) is lower than the estimated weight at the time of discharge by 1 g or more (No in S112), It is detected that there is a part shortage in the process (S114).

  According to the above configuration, the process identification unit 37 acquires the weight information for each process from the weight measurement unit 3 and identifies which process the weight information is for. Next, the process delimiter determination unit 31 detects the change in the weight information and specifies the time point when the weight is reduced to the weight when not working as the process delimiter, that is, the process end point.

  Subsequently, the weight comparison unit 33 determines the actual weight at the end of the process specified by the process delimiter determination unit 31 and the weight of the work place immediately before the work is discharged from the process specified by the process identification unit 37. Compare the estimated estimated weight at the time of discharge. The estimated weight at the time of discharge is an assumed weight at the time when the assembly work in the process is completed, and is calculated in advance for each process from the procedure of the assembly work and the weight of the parts to be assembled.

  When the actual weight is equal to or greater than a predetermined value and less than the assumed weight, the missing part determination unit 34 determines that there is a part that has been forgotten to be assembled to the workpiece in the process. The determination result output unit 35 presents the determination result of the shortage determination unit 34 to the user.

  Therefore, whenever weight information is input from the weight measuring unit 3 to the process management device 2 and the process delimiter determining unit 31 specifies a process delimiter, the weight comparison unit 33 compares the actual weight with the assumed weight, The product determination unit 34 determines whether there is a missing part.

  As a result, when a component shortage is detected, it is clear that the assembly failure of the component has occurred in the process specified by the process identification unit 37, and the determination result output unit 35 causes the component missing part to be detected in any process. It is possible to present information to the user as to whether the product has been generated.

  Therefore, the user can immediately recognize the process in which the part shortage has occurred and respond quickly, and as a result, in the assembling process, defective products can be found early and repair cost can be reduced. It becomes possible.

  Further, when the process delimiter determining unit 31 can identify the start time of the process by detecting the increase in weight from the non-working weight, the weight comparing unit 33 determines the actual weight at the start of the process. Thus, it is possible to compare the assumed weight at the time of introduction of the process. As a result, it is possible to determine whether there is a missing part in the previous process of the process specified by the process identification unit 37. As a result, in the assembling process, defective products can be found early and the rework cost can be reduced. Is possible.

  Furthermore, the process management apparatus 2 according to the present invention may include a work time measurement unit 13 inside the control unit 10. By identifying the process breaks based on the acquired weight information, it is possible to obtain the time of the identified process breaks and calculate the working time for the process that is the subject of weight measurement.

  This makes it possible to calculate the working time by specifying the start and end times of the process based on the weight variation of the workpiece, even in hand-assembled lines where it is difficult to specify process breaks using sensors. It becomes.

  In the present embodiment, both the start and end of the process are determined, and the weight comparison at both the start and end times is performed. However, at least one of the start and end of the process is determined. Even in such a case, it is possible to compare the weights at the step divisions and determine whether or not there is a missing part for each step.

[Embodiment 3]
In the second embodiment described above, the process management system has been described in which the weight measuring unit 3 is installed on the work table in each process, and the weight from the start to the end of the work is measured to detect a missing part. However, the process management system of the present invention is not limited to the above, and is constructed as a process management system that detects a missing part even in a configuration in which the weight measuring unit is installed in a work (work-in-process) storage place installed between processes. It is possible. Hereinafter, another process management system applied to a production system having a hand-assembled production line composed of four processes will be described.

[Outline of process control system 3]
FIG. 12 is a diagram illustrating a configuration of a production system 1 for a certain product to which the process management system 300 according to the present embodiment is applied. In the example shown in FIG. 12, the production system 1 is discharged from the process immediately after each of the production line including the four processes (A to D processes) for manufacturing a product by an operator's manual work and the above production line. A workpiece storage area 83a to 83d that temporarily stores the workpiece, and a process management device 2 that manages the work of each process, and a weight measurement that measures the weight of the workpiece stored in the workpiece storage area 83a to 83d. A process management system 300 including units 3a to 3d (in the case where it is not particularly necessary to distinguish between the units 3a to 3d, simply referred to as a weight measurement unit 3)

  For example, the weight measuring unit 3a that measures the weight of the work Wa that has completed the process A is installed in the work place 83a immediately after the process, as shown in a one-dot chain line frame in FIG. That is, the weight measuring unit 3 measures the weight of the workpiece in the residence time from the end of the previous process to the start of the next process.

  The weight measuring unit 3 of the present embodiment is realized by attaching a strain sensor, for example, as in the above-described embodiments. The strain sensor applies a load to a specimen and acquires the amount of strain depending on the degree of deformation. In addition, when there is no said strain sensor, it is possible to implement | achieve the weight measurement part 3 with a balance, a spring scale, etc., for example. More specifically, a weight measuring device realized by a balance, a spring scale, or the like is installed in the work places 83a to 83d, and the value indicated by the weight measuring device is set by another sensor (for example, a photoelectric sensor or a displacement sensor). To detect. Thereby, it is possible to perform weight measurement even when there is no strain sensor.

  FIG. 13 shows the relationship between the passage of time and the actual weight of the work placed in the work place 83a between the A process and the B process as measured by the weight measuring unit 3a in the production system 1 of FIG. It is a graph. The horizontal axis of Grph3 indicates the passage of time. The vertical axis represents the actual weight of the work placed on the work place 83a measured by the weight measuring unit 3a.

  The process delimiter determination unit 31 (FIG. 8) detects a change in weight, sets the weight increase time as the end time (E) of the immediately preceding process, and sets the weight decrease time as the start time of the next process (S ), And the time at this time is acquired and recorded in the progress information recording unit 43.

  The weight comparison unit 33 is recorded in advance in the actual weight of the workpiece in the residence time period from the end time of the previous process (A process) to the start time of the next process (B process) and the work-in-progress weight DB 44. The estimated weight between the AB processes is compared.

  The shortage determination unit 34 determines whether the error value between the actual weight and the assumed weight is within the error threshold value recorded in the threshold value recording unit 42 (weight range j in FIG. 13). The presence / absence of a component shortage in step (A) is determined. The determination result output unit 35 outputs the determination result of the shortage determination unit 34 to the output unit 5 via the shortage determination result output control unit 22 and presents it to the user.

  According to the above process, it is possible to determine the presence or absence of a missing part in the previous process by acquiring the weight of the workpiece that is staying between processes and comparing it with the assumed weight. As a result, in the assembly process, it is possible to detect defective products at an early stage and reduce the rework cost.

  Furthermore, the process management apparatus 2 according to the present invention may include a work time measurement unit 13 inside the control unit 10. By detecting the change in weight, the time at which the process break is specified can be acquired from the start / end time of the dwell time, so the work time measuring unit 13 can measure the work time. It becomes.

  In each of the above-described embodiments, the component weight is detected when the actual weight is lower than the assumed weight (for example, point F in FIG. 13). However, the present invention is not limited to the above. It is good also as a structure which detects the assembly | attachment mistake of components by exceeding more than a plan value (for example, point G of FIG. 13), and alert | reports to a user. As a result, it is possible to quickly find defective products that have exceeded the appropriate weight due to component assembly mistakes, and reduce the cost of repair.

[Embodiment 4]
In each of the above-described embodiments, the case where one type (model) of product (work) is produced on one production line has been described for the sake of simplicity of explanation. Next, a configuration for dealing with a case where the process management system 100 (200, 300) according to the present invention handles a plurality of types of workpieces on one production line will be described.

  FIG. 14 is a block diagram showing a main configuration of the process management device 2 according to the present embodiment. 14 correspond to the reference numerals assigned to the constituent elements in FIGS. 1 and 8, and the same reference numerals indicate the same constituent elements. Therefore, the description about the component already demonstrated by the above-mentioned embodiment is not repeated. In the process management apparatus 2 of FIG. 14, the differences from FIGS. 1 and 8 will be described in detail below.

[Process management system that handles multiple types of workpieces]
When a plurality of models are mixed in one production line, the assumed weight of each process must be registered for each model, and the above error threshold must be set according to the model. Therefore, it is necessary for the process management apparatus 2 to recognize which type of workpiece is flowing through the process. Two configurations and methods for specifying the workpiece type will be described below.

(Embodiment 4-1)
In the present embodiment, the model is specified using the product ID input to the process management device 2. In the present embodiment, the process management apparatus 2 further includes an ID input control unit 25 inside the input unit 7 and the input / output control unit 11, and a type identification unit (type identification unit) 36 inside the process management control unit 12. Yes. The recording unit 40 has an ID information recording unit 46, and the correspondence information recording unit 45 further records an ID-type conversion table.

  The input unit 7 acquires a product ID that is uniquely assigned to a work and inputs the product ID to the process management device 2. As a method for acquiring a product ID from a workpiece flowing through a process, the input unit 7 is configured as a barcode reader, and the barcode printed on the workpiece itself or an instruction book is read and supplied to the process management apparatus 2. And so on. In addition, a product ID may be automatically acquired from an RFID tag attached to the work.

  The ID input control unit 25 receives the product ID input from the input unit 7 together with the input time, and records it in the ID information recording unit 46.

  When the process delimiter determining unit 31 acquires weight information from the weight measuring unit 3, the type identifying unit 36 identifies the type of the workpiece that is the target of weight measurement. First, the model identification unit 36 acquires the product ID of the workpiece from the input product ID based on the measurement time of the weight information and the input time of the product ID. For example, in the production system 1 of FIG. 2, when the workpiece ID is read by the input unit 7 when the workpiece A process is input (that is, when workpiece weight measurement is started), an input time that matches the weight measurement start time is recorded. The product ID is acquired from the ID information recording unit 46. Subsequently, with reference to the ID-model conversion table recorded in the correspondence information recording unit 45, the model is specified from the acquired product ID.

(Embodiment 4-2)
In the present embodiment, the model is acquired by using the difference in the weight of the initial workpiece Wo immediately before being put into the first process (A process). In the present embodiment, the process management apparatus 2 includes a type identification unit 36 inside the process management control unit 12 and records an initial workpiece weight-type correspondence table in the correspondence information recording unit 45.

  FIG. 15 is a diagram showing an example of an initial workpiece weight-type correspondence table according to the present embodiment.

  When the process delimiter determining unit 31 acquires weight information from the weight measuring unit 3, the type identifying unit 36 identifies the type of the workpiece that is the target of weight measurement. First, when newly acquiring weight information, the model identification unit 36 acquires the weight at the start of weight measurement, that is, the weight of the initial workpiece Wo (FIG. 2).

  Next, the model identifying unit 36 refers to the initial workpiece weight-model correspondence table of the correspondence information recording unit 45 and identifies the model based on the acquired initial workpiece weight. For example, when the initial workpiece weight acquired above is 400 g, the model identification unit 36 identifies the model of the workpiece as “C” from the initial workpiece weight-model correspondence table shown in FIG.

  In each of the above-described embodiments (Embodiments 4-2 and 4-3), the assumed weight of each process is recorded for each model in the work-in-process assumed weight DB 44. FIG. 16 shows an example of work-in-process assumed weight information in which the assumed weight of each process is recorded for each model. According to the example of FIG. 16, for example, when the model identifying unit 36 specifies that the model is “K0001”, when comparing with the actual weight immediately after step 2, the weight comparing unit 33 “270 (g)” is acquired as an assumed weight.

  The threshold recording unit 42 records an error threshold for each model. Therefore, the weight comparison unit 33 acquires the assumed weight and compares the weights based on the model specified by the model identification unit 36 as described above. Further, the missing part determination unit 34 acquires an error threshold value based on the specified model, and determines whether or not a part is missing.

  From the above, even in a production line in which a plurality of types are mixed, the process management system 100 (200, 300) of the present invention can be applied, and a workpiece type is specified and appropriate for each type. It is possible to determine whether there is a missing part. Moreover, even if the type identification unit 36 in the present embodiment is provided in the process management device 2 shown in FIG.

  Note that the assumed weight of the work (work in process) referred to by the weight comparison unit 33 is not limited to the configuration recorded in advance in the work in progress assumed weight DB 44. For example, the recording unit 40 has a work procedure database (DB) that records which parts are assembled in which order for each model and process, and a parts weight database (DB) that records the weight of each part, A configuration may be provided that includes a work-in-progress weight calculation unit (not shown) that calculates a work-in-process estimated weight for the specified model and process with reference to the work procedure DB and the part weight DB.

  In a production line that handles multiple types of models, the models are different, but even if many parts are used, it is not necessary to set and record all the work-in-progress weights for each model and process.

  In each of the above-described embodiments, the work assembling work has been described. However, the present invention is not limited to this. For example, the process management system 100 (200, 300) of the present invention can be applied even in the case of product disassembly work. In this case, it is possible to grasp to which process the disassembling has progressed and to check whether or not the correct parts are disassembled in the correct order. Furthermore, it is possible to calculate the work time related to the disassembly work for each process.

  In each of the above-described embodiments, the process management device 2 includes the weight comparison unit 33, the shortage determination unit 34, and the determination result output unit 35 for detecting the occurrence of defects inside the process management control unit 12. However, the process management device 2 of the present invention is not limited to the above configuration. For example, a configuration in which the operation time measuring unit 13 is provided may be employed even if the above-described units for detecting the occurrence of defects are not provided.

  Accordingly, it is possible to realize the process management apparatus 2 that can detect a process break from weight information, obtain a process start time and an end time, and measure a work time in a hand-assembled line. Become.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  Finally, each block of the process management apparatus 2, particularly the process management control unit 12 and each internal part thereof may be configured by hardware logic, or may be realized by software using a CPU as follows. .

  That is, the process management apparatus 2 includes a CPU (central processing unit) that executes instructions of a control program that realizes each function, a ROM (read only memory) that stores the program, and a RAM (random access memory) that expands the program. And a storage device (recording medium) such as a memory for storing the program and various data. An object of the present invention is a recording medium on which a program code (execution format program, intermediate code program, source program) of a control program of the process management apparatus 2 which is software for realizing the functions described above is recorded so as to be readable by a computer. This can also be achieved by supplying the process management apparatus 2 and reading and executing the program code recorded on the recording medium by the computer (or CPU or MPU).

  Examples of the recording medium include a tape system such as a magnetic tape and a cassette tape, a magnetic disk such as a floppy (registered trademark) disk / hard disk, and an optical disk such as a CD-ROM / MO / MD / DVD / CD-R. Card system such as IC card, IC card (including memory card) / optical card, or semiconductor memory system such as mask ROM / EPROM / EEPROM / flash ROM.

  Moreover, the process management apparatus 2 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network. The communication network is not particularly limited. For example, the Internet, intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication. A net or the like is available. Also, the transmission medium constituting the communication network is not particularly limited. For example, even in the case of wired such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL line, etc., infrared rays such as IrDA and remote control, Bluetooth ( (Registered trademark), 802.11 wireless, HDR, mobile phone network, satellite line, terrestrial digital network, and the like can also be used. The present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.

  According to the configuration of the process management device of the present invention, it is possible to identify a process break by measuring the weight of a work object, and obtain the weight at that time, so that the assembly work of parts, The present invention can be applied to a production process management system that detects defects occurring in the disassembly work for each process. In addition, since the process management apparatus of the present invention can also acquire the specified process break time, it is difficult to automatically acquire the start and end of the process, and it is difficult to measure the working time. Even in the line, it can be applied to a work time measuring system capable of automatically measuring the work time.

It is a block diagram which shows the principal part structure of the work monitoring apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the production system to which the process management system which concerns on this embodiment is applied. It is a graph which shows the relationship between progress of time and the weight of a workpiece | work until a workpiece | work will be completed through each process in the production system shown in FIG. It is a figure which shows the example of progress information for every process division (dwelling time slot | zone) which the process division | segmentation determination part specified is recorded on a progress information recording part. It is a figure which shows the example of the work-in-progress estimated weight information for every process of the production system shown in FIG. 2 which the work-in-process estimated weight DB records. It is a figure which shows the structure of the production system to which the process management system which concerns on other embodiment of this invention is applied. It is a figure which shows the example of installation of the weight measurement part installed in each process in the production system shown in FIG. It is a block diagram which shows the principal part structure of the process management apparatus which concerns on other embodiment of this invention. FIG. 7 is a graph showing the relationship between the passage of time and the total weight on the workbench in the process measured by the weight measuring unit in the production system shown in FIG. 6. (A) is a figure which shows the example of the progress information produced | generated when a process division | segmentation determination part acquires the start time and end time of a process from weight information, (b) is a figure which shows a weight comparison part. It is a figure which shows the example of work-in-progress estimated weight information for obtaining the estimated weight for comparing with a weight. It is a flowchart which shows the flow of the process which detects the components shortage of the process management apparatus shown in FIG. It is a figure which shows the structure of the production system to which the process management system which concerns on other embodiment of this invention is applied. 13 is a graph showing the relationship between the passage of time and the actual weight of a workpiece placed in a workpiece storage place between a certain process and the next process, measured by a weight measurement unit, in the production system shown in FIG. It is a block diagram which shows the principal part structure of the process management apparatus which concerns on other embodiment of this invention. It is a figure which shows the example of the initial stage workpiece | work weight-type correspondence table which a correspondence information recording part records. It is a figure which shows the example of the work-in-progress estimated weight information of each process for every model which the work-in-process estimated weight DB records.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Production system 2 Process management apparatus 3 Weight measurement part 4 Reception part 5 Output part 5a Sound generation part 5b Display part 6 Operation part 7 Input part 10 Control part 11 Input / output control part 12 Process management control part 13 Work time measurement part (work time Measuring means)
21 Weight information input control unit (weight information acquisition means)
22 Out-of-stock determination result output control unit 23 Operation reception unit 24 Work time output control unit 25 ID input control unit 31 Process delimitation determination unit (work specifying means)
32 process progress judgment part (process identification means)
33 Weight comparison part (weight comparison means)
34 Out-of-stock determination unit (defect determination means)
35 judgment result output unit (judgment result output means)
36 Model identification part (model identification means)
37 process identification part (process identification means)
38 Work identification unit 40 Recording unit 41 Weight information recording unit 42 Threshold recording unit 43 Progress information recording unit 44 Work-in-progress weight database 45 Corresponding information recording unit 46 ID information recording unit 100 Process management system 200 Process management system 300 Process management system

Claims (13)

Weight information acquisition means for acquiring weight information on a work object flowing through each process of the production line;
Work identification means for identifying the work time zone of the process based on the increase or decrease of the actual weight of the work object;
A weight comparison means for comparing the actual weight in the specified work time zone with a preset assumed weight associated with the work time zone;
Based on the comparison result of the weight comparison means, defect determination means for determining the quality of the work object in the work time zone,
A process management apparatus comprising: a determination result output means for presenting a determination result of the defect determination means to a user. A process specifying means for specifying a process in a work time zone specified by the work specifying means;
The weight information acquisition means acquires, as the weight information, the actual weight of the work object measured for each work object over each process of the production line, and the measurement time,
The work specifying means detects that the actual weight of the work object is stable for a certain time, specifies a time zone in which the actual weight is not stable as the work time zone,
The weight comparing means compares the actual weight of the work time zone specified by the work specifying means with a preset assumed weight associated with the specific process specified by the process specifying means,
The process management apparatus according to claim 1, wherein the defect determination unit determines whether the work object is good or bad before the specific process. A process identification means for identifying which process the weight information acquired by the weight information acquisition means belongs to;
The weight information acquisition means acquires, as the weight information, the actual weight of the arrangement place where the work object is arranged and the measurement time measured for each process of the production line,
The work specifying means detects a start time when the actual weight of the arrangement place fluctuates from a non-work weight and an end time when the real weight fluctuates to a non-work weight. Up to the above work hours,
The weight comparison means compares the actual weight of the work time zone specified by the work specification means with a preset assumed weight associated with the identification process identified by the process identification means,
The process management apparatus according to claim 1, wherein the defect determination unit determines whether the work object is good or bad before the identification process. The weight comparison means compares the actual weight at the end time detected at the end time detected by the work specifying means with a presumed weight set in advance as a weight when the work object is discharged from the identification step,
The process management apparatus according to claim 3, wherein the defect determination unit determines whether the work object is good or bad in the identification process. The weight comparison means further compares the actual weight at the start time detected at the start time detected by the work identification means with a presumed weight set in advance as a weight when the work object is put into the identification process. And
5. The process management apparatus according to claim 4, wherein the defect determination unit determines whether the work object is good or bad in the process before the identification process.   Work time measuring means is provided for acquiring the start time and end time of the work time zone of the process specified by the work specifying means, and measuring the work time of the process from the difference between the start time and the end time. The process management apparatus according to claim 1, wherein the process management apparatus is provided. The initial weight information of the work object input to the head process of the production line is acquired, the product type information recorded in association with the initial weight information is extracted, and the type of the work object is identified. With model identification means,
7. The weight comparison unit according to any one of claims 1 to 6, wherein the weight comparison unit obtains an assumed weight of each step for each model identified by the model identification unit and compares it with an actual weight. The process management apparatus as described. The assumed weight is calculated for each process based on the part weight indicating the weight of each part to be assembled to the work target of the assembly work and the assembly order of the parts,
The process management apparatus according to claim 1, wherein the defect determination unit determines that a component shortage has occurred when the actual weight is smaller than the assumed weight. The assumed weight is calculated for each process based on the part weight indicating the weight of each part to be removed from the work object to be disassembled and the removal order of the parts,
The defect determination means determines that an error has occurred in the disassembling procedure of the work object when the difference between the actual weight and the assumed weight is equal to or greater than a predetermined value. 8. The process management apparatus according to any one of 7 above. A weight measuring unit that measures the weight of a work object flowing through each process of the production line and generates weight information;
The process management device according to any one of claims 1 to 9, wherein the process management device performs determination of good / bad of the work object for each process based on the weight information acquired from the weight measurement unit. A characteristic process management system. A first step of acquiring weight information regarding a work object flowing through each process of the production line;
A second step of identifying the work time zone of the process based on the increase or decrease of the actual weight of the work object;
A third step of comparing the actual weight in the specified work time zone with a preset assumed weight associated with the process in the work time zone;
A fourth step of determining whether the work object is good or bad in the work time zone based on the comparison result of the weight comparison means;
And a fifth step of presenting the determination result of the defect determination means to the user.   A control program for operating the process management apparatus according to any one of claims 1 to 9, wherein the control program causes a computer to function as each of the above means.   A computer-readable recording medium on which the control program according to claim 12 is recorded.

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