JP4220007B2 - Production scheduling device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a production scheduling method for making a production plan when a large number of products are manufactured in a factory, and in particular, production scheduling in consideration of contract power.Regarding the device.
[0002]
[Prior art]
In factories that manufacture multiple types of products, create a production plan (scheduling) that indicates which products are manufactured at what timing before actually starting manufacturing for each product in order to efficiently manufacture each product. )
[0003]
In the scheduling of production plans for a plurality of types of products, the manufacturing time (manufacturing schedule) of each product is generally determined as shown below.
(a) Allocate the production time (manufacturing schedule) of each product according to the schedule conditions such as the date when production can be started, the delivery date of each product, and the time required to manufacture each product.
[0004]
(b) Allocate the production time (production schedule) of each product according to the conditions related to equipment resources such as the number of production equipment in the factory and the efficiency of setup (replacement) of equipment.
(c) Allocate the production time (production schedule) of each product based on the past production results.
[0005]
For example, as shown in FIG. 13, when two manufacturing facilities are installed in a factory and there are manufacturing requests for a total of 12 types of products 12 including A1 to A3, B1 to B3, C1 to C3, and D1 to D3, The production time of each product 12 is allocated within the scheduling period so that similar products 12 of A1 to A3 are continuously produced so that the setup (replacement) of each production facility proceeds smoothly.
[0006]
In addition, electric power is widely adopted as a power source for each manufacturing facility in such factories.
Electric power demand is subject to large seasonal fluctuations, and in particular, large electric power demand is generated during the summertime when the cooling demand is large. Since it is difficult to construct a power plant to meet this maximum power demand, various measures have been taken to suppress the power demand during the summer daytime.
[0007]
As one of countermeasures, for example, daytime power demand in a manufacturing plant is suppressed. Specifically, for example, one day is set as one scheduling period, and the day is divided into 24 equal parts, and contract power is set at the power company and the manufacturing factory for each of the 24 time zones. As a manufacturing factory, the operation of each manufacturing facility is adjusted so that the actual power used in the corresponding time zone does not exceed the contract power. As shown in FIG. 14, the contract power for each time zone is set to be low during the day and high during the night. As shown in FIG. 14, for example, a characteristic in which contract power for each time period in a certain period such as 24 hours a day is connected is referred to as a contract power pattern.
[0008]
In the manufacturing factory, there is a case where a power monitoring device (demand monitoring device) that automatically adjusts the operation of each manufacturing facility is installed so that the actual power usage does not exceed the contract power for each time zone. .
[0009]
FIGS. 15A and 15B are characteristic diagrams showing the monitoring operation of the power monitoring apparatus (demand monitoring apparatus) described above. The horizontal axis indicates the elapsed time in one time zone, and the vertical axis indicates the power used. Then, the actual power usage at each time from the start time (0 minutes) to the end time (60 minutes) of each time zone is measured with a power meter, and the time zone is determined from the slope of the actual power usage characteristics at an arbitrary time. The power consumption at the end time (60 minutes) is predicted.
[0010]
And as shown to Fig.15 (a), when the predicted value of the electric power used in end time (60 minutes) is below contract electric power, it judges that it is normal and continues manufacture of each product as it is.
On the other hand, as shown in FIG. 15B, when the predicted value of the power used at the end time (60 minutes) exceeds the contract power, it is determined as abnormal, and the operation of each manufacturing facility is suppressed.
[0011]
[Problems to be solved by the invention]
However, the production planning scheduling method and the power monitoring method (demand monitoring method) as described above still have the following problems to be improved.
That is, in the above-described production plan scheduling method, the manufacturing time of each product is allocated within the scheduling period according to any of the conditions indicated by (a), (b), and (c) described above. Each of these conditions is merely for improving productivity as viewed from the manufacturing side.
[0012]
In general, when a product is manufactured at each manufacturing facility, the power used is often different depending on the characteristics (specifications) of each product. Moreover, the contract electric power mentioned above exists.
In such a case, for example, when products with high power consumption overlap in a specific time zone such as daytime, as shown in FIG. 15B, if the actual power usage exceeds the contract power within this time zone. May be predicted. In this case, since the production of the corresponding product is suppressed, the production efficiency is lowered.
[0013]
Conversely, if products with low power consumption overlap at a specific time, such as at night, for example, as shown in FIG. There is a concern that the power supplied to the factory cannot be used effectively.
[0014]
Furthermore, in the power monitoring method (demand monitoring method) described above, only the manufacturing time of one type of product is allocated to one time zone for demand monitoring, and the change in power used when one corresponding product is manufactured. When there is little (for example, when there is little difference in the used electric power in a process), the characteristic of the actual used electric power shown in FIG. 15 can be regarded as a substantially straight line. Therefore, it can be considered that the predicted value of the power used at the end time (60 minutes) performed at an arbitrary time is almost correct.
[0015]
However, when the manufacturing time of a plurality of types of products is assigned in one time zone, or when one type of product is manufactured and its power consumption changes greatly, the actual power usage characteristics are shown in FIG. As shown in FIG. 4, a line graph in which the slope changes when the manufactured product is changed is obtained. Therefore, the predicted value of the power used at the end time (60 minutes) performed at an arbitrary time is not always correct. As a result, there is a concern of suppressing the operation of each manufacturing facility based on an erroneous prediction value. On the other hand, there is a concern that the actual used power may exceed the contracted power by mistake.
[0016]
The present invention has been made in view of such circumstances, and by adopting the power used for each product to be manufactured for scheduling, each product can be efficiently used without exceeding the contract power for each time zone. It is an object of the present invention to provide a production scheduling apparatus, a production scheduling method, and a recording medium on which a program can be recorded.
[0018]
[Means for Solving the Problems]
  In order to solve the above-mentioned problem, in the production scheduling apparatus according to claim 1, the time required for manufacturing the corresponding product for each product to be manufactured in the factoryNecessary for manufacturing the productA product master file that stores power consumption and manufacturing attributes, a contract power pattern memory that stores contract power patterns consisting of contract power given for each time period in a predetermined schedule period in the factory, and a product master file Each stored product is grouped into a plurality of product groups of similar specifications and characteristics, and product grouping means for obtaining power consumption and manufacturing time for each product group, and stored in the contract power pattern memory Production time schedule that assigns the production time of the product group with high power consumption to the production time of the product group with low power consumption in order from the time zone with high contract power to the time zone with low contract power in each time zone of the contract power pattern. Multiple product groups in the same time zone When the production time is assigned, the production time for each product group within this time zone is assigned based on the restrictions on the production order between the product groups, and the products belonging to each product group Product group allocation means for allocating the manufacturing time within the manufacturing time allocated to the product group to which the product belongs.
  Moreover, in Claim 2, it allocated to each time slot | zone by the manufacturing time allocation means and the time slot | zone allocation means.When there is a time gap between adjacent products in the production time of each product group,Within the schedule period, there is provided an allocation adjusting means for assembling beyond the boundary of each time zone.
[0019]
In the production scheduling apparatus configured as described above, the product master file stores the time required for manufacturing the product and the power used for each product. And when allocating the manufacturing time of each product, products with high power consumption are allocated to the high hours of contract power within the contract power pattern. Conversely, products with low power consumption are contract power within the contract power pattern. Assigned to a low time zone.
[0020]
  In this way, by making the power consumption of each product correspond to the contract power pattern, it is possible to efficiently manufacture each product without exceeding the contract power for each time zone.
[0021]
  further,Multiple in the same time zoneofProductgroupIf the production time is assigned, each product within this time zonegroupThe production time of each productAllocation based on manufacturing order constraints between groupsing. That is, when manufacturing a plurality of products, there are products that should be manufactured continuously due to manufacturing factors such as equipment changeover. When products having such a relationship are assigned to the same time, manufacturing time is assigned according to this order. Therefore, each product is manufactured more efficiently.
[0022]
  In claim 3, when each product is actually manufactured, from the wattmeterMeasure the number of pulses per unit time of the pulse signal output each time the unit power is used, and multiply the number of pulses by the unit power to obtain the power used at each time.A power usage pattern from the start of manufacturing the product to the end of manufacturing is calculated, and the power usage of each product registered in the product master file is obtained from the calculated power usage pattern.
[0023]
By adopting such a calculation method, the power consumption of each product can be obtained more accurately.
According to a fourth aspect of the present invention, the product attribute in the above-described production scheduling apparatus includes the production amount of the corresponding product, and the production time allocation means corresponds to the power used by referring to the production amount of each product with respect to the production time of each product. They are assigned to the contract power hours.
[0024]
  That is, when scheduling is performed, the efficiency of scheduling is improved by referring to the production amount of each product and selecting a scheduling measure.
  Moreover, in Claim 5, in each time slot | zone of the contract power pattern to which the manufacturing time of each product was allocated.Stored in the product master filePlanned power consumption calculating means for calculating the planned power consumption at each time within each time zone from the power consumption of each product is provided.
  Furthermore, in claim 6, the manufacturing progress status at each time after the start of manufacturing in the factory is checked, and from each time to the schedule period end time from the power used of each product manufactured from each time to the schedule period end time. Predicted power consumption calculating means for calculating the predicted power consumption is provided.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a sketch of a manufacturing factory in which the production scheduling device and the power monitoring device of the present invention are incorporated. The power receiving chamber 1 to which commercial power is input from the outside supplies the received power to the respective adjustment target facilities 2 a and 2 b via the power receiving control panel 3. The received power is input to the input / output port 6 installed in the process manager office 5 via the received power measurement cable 4. In addition, the electric power used in each of the adjustment target facilities 2a and 2b for manufacturing various products is input to the input / output port 6 also installed in the process manager office 5 via the facility power measurement cables 8a and 8b. Is done.
[0033]
In the process manager office 5 in which the process manager 11 resides, the input / output port 6, the power monitoring apparatus 7, the scheduling apparatus 8 as a production scheduling apparatus, and the existing production management system 10 are provided. It has been.
[0034]
A production management system 10 constituted by a computer performs production management of each product manufactured in this factory. Specifically, for example, for each fixed scheduling period such as one day, each product and production amount that need to be manufactured in each adjustment target facility 2a, 2b within the corresponding scheduling period are determined, and the next scheduling apparatus Send to 9.
[0035]
The scheduling device 9 is constituted by a kind of information processing device such as a computer, and assigns each product instructed from the production management system 10 to which adjustment target equipment 2a, 2b, and the manufacturing time of each product. A scheduling process for determining which time zone within the scheduling period such as 1 day is assigned is executed. Then, the scheduling device 9 informs the scheduling results to the respective adjustment target facilities 2a and 2b, calculates the planned power usage in each time zone, and sends it to the next power monitoring device 7.
[0036]
The power monitoring device 7 performs demand power monitoring so that the received power input through the input / output port 6, that is, the actual power used in the entire factory does not exceed the contract power. That is, when the actual used power is likely to exceed the contract power, an operation adjustment command is sent to each of the adjustment target facilities 2a and 2b to prevent the actual used power from exceeding the contract power.
[0037]
FIG. 2 is a flowchart showing a schematic operation of the scheduling device 9 and the power monitoring device 7 described above.
First, master data is prepared in the scheduling device 9 (S0). Specifically, the specification / characteristics (material, shape, accuracy, etc.) of each product manufactured at this factory, the acquisition of the product master such as the time required for manufacturing, etc., the power pattern of each product shown in FIG. ) Setting, calculation of power consumption for each product from this set power pattern, setting of equipment conditions for each adjustment target equipment 2a, 2b such as changeover, taking in of contract power data with electric power company, etc. carry out.
[0038]
  Finally, for each product to be manufactured in this factory, the required time for manufacturing the product, power consumption, and manufacturing attributes are collected in a product master file. The manufacturing attribute indicates a preparatory work process on equipment required for manufacturing the corresponding product described above. Therefore, it is indicated that it is preferable to allocate the manufacturing time of each product adjacent to each other for products having the same or similar manufacturing attributes. For example, when the specifications and characteristics of each product are compared and the same thickness and the same material are approximate, the manufacturing attributes are the same or similar.
  Therefore, as will be described later, the products stored in the product master file are grouped into a plurality of product groups having similar specifications and characteristics.
[0039]
Further, a contract power pattern including contract power given for each time period such as one hour in a scheduling period such as one day as shown in FIGS. 5 and 7 is created from the acquired contract power data. To the contract power pattern memory.
[0040]
When the master data preparation process is completed, a production request including a product and a production amount to be produced within one scheduling period such as one day is taken from the production management system 10 and temporarily stored in, for example, a buffer ( S1). Next, the scheduling process shown in FIGS. 3 and 4 for each product included in the manufacturing request is executed (S2).
[0041]
  In the scheduling process in FIG. 3, first, each product to be manufactured stored in the buffer is read (Q1). Then, the specifications / characteristics (material, shape, accuracy, etc.) of each product are compared (Q2), and are grouped for each manufacturing attribute described above. At the same time as groupingProductFrom the power consumption of each product belonging to the groupProductIn addition to obtaining power consumption for the entire group, eachProductThe manufacturing time of the entire manufacturing group is obtained from the manufacturing time of each product belonging to the group (Q3).
[0042]
  And groupedProductIt is verified whether there is an inter-group condition for the manufacturing order between the groups (Q4).
  For example, when the product is a steel material and rolled to form a steel material having a predetermined shape, the plate width is wide.ProductNarrow groove and plate widthProductCompared with the groove, the plate width is wideProductGroove is narrowProductIf the product is manufactured before the groove, preparation work such as changeover in a production facility such as a rolling mill can be performed in a short time.
[0043]
  When there is an inter-group condition (Q5), the process proceeds to Q6, and the contract power in each time zone constituting the contract power pattern stored in the contract power pattern memory is from the highest to lowest time of the contract power. The highest power consumptionProductThe lowest power consumption from the grooveProductAssign each groove production time in turn.
[0044]
  And several in the same time zoneProductWhen the manufacturing time of a group is assigned (Q7), each within the same time zoneProductEach manufacturing time of the group is reassigned within the corresponding time zone according to the inter-group condition determined by the manufacturing attribute described above (Q8).
[0045]
  Further, when there is no inter-group condition (Q5), the process proceeds to Q9, and the contract power in each time zone constituting the contract power pattern stored in the contract power pattern memory is the lowest time from the time zone with the highest contract power. The highest power consumption over the beltProductThe lowest power consumption from the grooveProductEach manufacturing time of the groove is assigned in order (Q9).
[0046]
  And several in the same time zoneProductWhen the manufacturing time of a group is assigned (Q10), each within the same time zoneProductEach manufacturing time of the group is reassigned within the corresponding time zone in the order of early time (Q11).
[0047]
  Now, eachProductSince the allocation process for each time zone of the contract power pattern is completed for each manufacturing time of the groove, the allocation process of the manufacturing time of each product in each allocated product groove is executed after Q12 in FIG.
[0048]
In Q12, read one assigned product groove and compare the specifications / characteristics (material, shape, accuracy, etc.) of each product (Q13), and whether there is an in-group condition for the manufacturing order for each product. It is verified whether or not (Q14).
[0049]
  If an intra-group condition exists (Q14), proceed to Q15ProductThe manufacturing order of each product in the group is rearranged according to the intra-group condition determined by the manufacturing attribute described above.
[0050]
  If there is no in-group condition (Q14), proceed to Q16ProductRearrange the manufacturing order of each product in the group in descending order of power consumption.
  Since the production time allocation process for each product belonging to one product group has been completed, the presence / absence of an unprocessed product group is determined in Q17, and if it exists, the process returns to Q12. Proceed to Q18, and adjust the manufacturing time of each assigned product.
[0051]
That is, the production time of each product group and the assignment of the production time of each product are assigned with reference to the start time of each time zone in the contract power pattern as shown in FIG. There may be a gap between the manufacturing time 13 and the manufacturing time 13. Therefore, each manufacturing time 13 is packed across the boundary line of each time zone. In this way, by adjusting the allocation position of the manufacturing time 13, it becomes possible to insert (allocate) a new product groove or a new product manufacturing time 13 a into the remaining gap.
[0052]
When the manufacturing time adjustment process is completed, the manufacturing time allocation process (scheduling process) for each product requested by the production management system 10 is completed. Therefore, the process returns to S3 in FIG. Outputs the result of scheduling (scheduling) on the display screen. The process person in charge 11 (operator) confirms that the power load in each time slot of the allocation result does not exceed the contract power in the corresponding time slot.
[0053]
If the assignment is inappropriate (S4), the process returns to S1. If the attachment is normal, the total planned power usage for each time zone is calculated (S5). Specifically, the total value of power used by each product in each assigned time zone is obtained.
[0054]
The created planned power usage is sent into the power monitoring device 7 and a demand monitoring process is performed.
The created manufacturing time allocation (scheduling) result of each product is sent to each of the adjustment target facilities 2a and 2b. The workers of the respective adjustment target facilities 2a and 2b execute manufacturing for each product according to the received manufacturing schedule for each product (S8).
[0055]
  The scheduling device 9 checks the manufacturing progress of the products in the respective adjustment target facilities 2a and 2b (S9) If the actual progress is more than specified(S10)Raise an alarm(S11)At the same time, the person in charge 11 (operator) takes specific measures against the delay (S12).
[0056]
In the power monitoring device 7, in S6, a demand monitoring process is performed every time each time zone in the contract power pattern arrives.
That is, as shown in FIG. 10, for example, the contract power set in the corresponding time zone such as one hour is displayed and output on the display screen. This contract power is a constant value in the corresponding time zone. Further, the planned power consumption at each time in the corresponding time zone is calculated from the total planned power consumption calculated earlier, and displayed on the display screen. This planned power usage is a line graph in the upper right.
[0057]
Furthermore, the actual used power from the start time of the corresponding time zone obtained from each of the adjustment target facilities 2a and 2b to the current time is displayed on the display screen.
Furthermore, the predicted power consumption up to the end time (60 minutes) of the corresponding time zone at the current time is calculated and displayed on the display screen. In other words, the actual power consumption at the current time is used as a starting point, and prediction is made from the power consumption of each product manufactured from the current time to the end time.
[0058]
In FIG. 10, the planned power usage is indicated by a thin line, the actual power usage is indicated by a thick line, and the prediction is indicated by a dotted line.
And the difference of the actual used electric power obtained from each adjustment object installation 2a, 2b and plan electric power used is calculated. When the difference exceeds the allowable value (S13), an alarm is displayed to warn the process person 11 (S14).
[0059]
The process person 11 who confirmed the alarm investigates the cause of the abnormality. Further, as shown in FIG. 10 (b), when the predicted value at the end time (60 minutes) of the corresponding time zone exceeds the contract power, the process person in charge 11 issues an operation suppression instruction to each of the adjustment target facilities 2a and 2b. Or a power saving instruction to other equipment in the factory (S15).
[0060]
Next, a method for calculating the power consumption of each product will be described with reference to FIG.
A power measurement target product is actually manufactured in any of the adjustment target facilities 2a and 2b. And the pulse signal shown in the upper stage of FIG. 8 output whenever it uses unit electric power from the wattmeter installed in this adjustment object installation 2a, 2b is taken in. Then, the number of pulses in each unit time such as 1 minute in the time axis direction of the pulse signal is counted. Therefore, the power used for each unit time is the power obtained by multiplying the number of pulses by the unit power.
[0061]
And as shown in the lower stage of FIG. 8, the envelope shape of each electric power used for each unit time becomes the electric power pattern of the corresponding product. Then, the power obtained by integrating the power used for each unit time within the manufacturing time of the corresponding product becomes the power used for the corresponding product.
[0062]
Next, a method for calculating a power pattern in the case where a product is manufactured for the specified amount at the specified manufacturing time will be described with reference to FIG.
In general, the production time of a product depends on the production amount of the corresponding product. FIG. 9A shows a power pattern in the case where the product already produced by the method shown in FIG. 8 is produced by the production amount [1]. Similarly, FIG. 9B shows a power pattern when the same product already produced by the method shown in FIG.
[0063]
And the case where the power pattern in the case of manufacturing the same product in the manufacturing time instructed by the manufacturing amount [1.5] is shown.
In this case, since the target production amount is an intermediate value between the two, the power used for each unit time in the target power pattern is an intermediate value between the two. Then, when there is only one of the used power, as shown in the figure, the used power on the existing side is multiplied by the ratio [a / b] between the currently existing side and that of the existing power pattern when both are present. Value. Further, if there is no usable power that can be referred to, the last used power is extended.
[0064]
As described above, the power pattern in the case where the product is manufactured with the specified manufacturing amount in the specified manufacturing time can be calculated from the actual data when there is a track record of manufacturing the same product in the past. Therefore, it is possible to calculate the power consumption of the entire product when the product is manufactured with the specified manufacturing amount and with the specified manufacturing time.
[0065]
The characteristics of the scheduling apparatus 9 configured as described above will be described with reference to FIG.
FIG. 5 shows a case where two manufacturing facilities are installed in the factory described with reference to FIG. 13 and there are manufacturing requests for a total of nine types of products 12 including A1 to A3, B1 to B3, and C1 to C3. Shows a case where a contract power pattern is set in which the contract power during the daytime period is low and the nighttime contract power is high.
[0066]
In this case, A1, B1,. The production time of each product 12 of A2 and A3 is allocated, and the power consumption is low B2, B3. The manufacturing time of each product 12 of C2 and C3 is assigned.
[0067]
Therefore, the combined power consumption pattern of each product assigned to the manufacturing facility 1 and the manufacturing facility 2 is a pattern that approximates the contract power pattern as shown in the figure.
In this way, by making the power consumption of each product correspond to the contract power pattern, each product can be efficiently manufactured in a state where the actual power consumption does not exceed the contract power for each time zone.
[0068]
Further, in the scheduling device 9 of the embodiment, a plurality of types of products manufactured in one scheduling period (period of contract power pattern) are grouped, and power consumption and manufacturing time are calculated for each product group, First, when the production time is assigned in units of product groups, and then multiple production groups are assigned in the same time zone, the product groups within the corresponding time zone based on the inter-group conditions determined by the production attributes The unit allocation is adjusted.
[0069]
Furthermore, the manufacturing order of each product belonging to one product group is also set based on the in-group conditions.
Therefore, the maximum productivity is secured while controlling so as not to exceed the contract power.
[0070]
FIG. 11 is a diagram illustrating an example of grouping a plurality of products.
The product in this example is a steel plate, and the adjustment target equipment is a rolling mill. The horizontal axis indicates the product type, and the vertical axis indicates the power used. When the plate width increases, the power consumption increases, and when the compression area increases, the power consumption tends to increase. However, there is little correlation with the passing time.
[0071]
In the case of such a product, it is possible to minimize the distribution of power used in one product group by forming one product group with the same plate width.
[0072]
In addition, as an inter-group condition, if the manufacture of products with a wide plate width is performed prior to the manufacture of products with a narrow plate width, the changeover work efficiency in the manufacturing facility is improved. When entering, products are manufactured in order from products with a wide plate width to products with a narrow plate width. Further, in the same time zone, the products are manufactured in order from a product group with high power consumption to a product group with low power consumption.
[0073]
FIG. 12 is a diagram showing the distribution of a plurality of types of products having different production quantities.
The horizontal axis shows the average power used by each product. In this figure, 15 types of products with different power consumption are manufactured. The vertical axis shows the production amount of each product. In other words, there is a large difference in power consumption between products. First, products with high power consumption (average power value) are allocated to high-contract time periods such as nighttime, and the power consumption (average power value) is Allocate low products, for example, during the daytime when the contract power is low.
[0074]
However, even if a product with a low power consumption (average power value) and a product with a high power consumption are manufactured, if there is a bias in either the amount of products with low power consumption or the amount of products with high power consumption, even if scheduling is used In some cases, a product with high power needs to be allocated in the daytime, which may be inappropriate for scheduling. On the other hand, as shown in the example of FIG. 13, when the amount of products with high power consumption is balanced with the amount of low products, the above-described allocation is performed by scheduling.
[0075]
Therefore, in the scheduling device 9 of the embodiment, when the production time of each product is assigned to each time zone of the contract power pattern, the amount of product with low power consumption or high product is also referred to with reference to the production amount of each product. Scheduling only when there is a bias in either of the quantity of products, and scheduling when there is a balance between the quantity of low products or the quantity of high products. This makes it possible to improve the efficiency of scheduling.
[0076]
Therefore, in the scheduling device 9 of the embodiment, when the production time of each product is assigned to each time zone of the contract power pattern, the production amount of each product is also referred to. Specifically, a value obtained by multiplying the power used by one product by the amount of manufacture of the corresponding product is used as the new power used for the corresponding product, and compared with the power used by other products, the manufacturing time is assigned.
[0077]
Next, the demand monitoring operation of the power monitoring apparatus 7 will be described with reference to FIG.
As described above, the contract power, the planned power consumption, the actual power usage, and the predicted power usage are displayed on the display screen of the power monitoring device 7.
[0078]
In the pattern C, the value and slope of the actual used power at the current time point are large, but since a product with small used power is manufactured thereafter, the predicted used power substantially matches the planned used power and is determined to be normal. By the way, in the conventional power monitoring device, it is determined that the actual power consumption exceeds the contract power at the end of the corresponding time period in order to predict the final power consumption based on the value and slope of the actual power consumption at the current time. Was.
[0079]
In pattern D, if the manufacture of a product different from the schedule is started at the current time point a and the power consumption of the product is large, the predicted power consumption increases, and the actual power consumption is contracted at the end of the corresponding time zone. It can be determined that power will be exceeded. In this case, it is necessary to take some measures since it exceeds the contract power.
[0080]
In the pattern E, the actual used power is smaller than the planned used power at the current time point. In this case, at a certain point in the past, for example, an abnormality has occurred in the manufacturing facility, indicating that the manufacturing has not proceeded smoothly. In this case, the predicted power usage is significantly smaller than the planned power usage.
[0081]
As described above, the predicted power consumption in the power monitoring apparatus 7 of the embodiment can greatly improve the prediction accuracy compared with the predicted power consumption in the conventional power monitoring apparatus in FIG. it can.
[0082]
The method described in the above-described embodiment is a program that can be executed by a computer, for example, on a recording medium such as a magnetic disk (floppy disk, hard disk, etc.), an optical disk (CD-ROM, DVD, etc.), and a semiconductor memory. It can be written and applied to various devices, or transmitted by a communication medium and applied to various devices. A computer that implements this apparatus reads the program recorded on the recording medium and executes the above-described processing by controlling the operation by the program.
[0083]
【The invention's effect】
As described above, in the production scheduling apparatus and production scheduling method of the present invention, the power consumption of each product to be manufactured is adopted, and the product with high power consumption for the high contract power time zone in the contract power pattern. Allotted manufacturing time.
[0084]
  Therefore, each product can be efficiently manufactured without exceeding the contract power for each time zone, and productivity can be improved.
[Brief description of the drawings]
FIG. 1 is a sketch of a manufacturing factory in which a production scheduling device and a power monitoring device according to an embodiment of the present invention are incorporated.
FIG. 2 is a flowchart showing a schematic operation of the scheduling device and the power monitoring device of the embodiment.
FIG. 3 is a flowchart showing a scheduling processing operation of the scheduling apparatus.
FIG. 4 is a flowchart showing the scheduling processing operation of the scheduling apparatus.
FIG. 5 is an operation explanatory diagram of the scheduling apparatus.
FIG. 6 shows the power pattern of one product
FIG. 7 is a diagram showing an adjustment operation for the assigned manufacturing time of the product group.
FIG. 8 is a diagram showing a method for calculating a power pattern
FIG. 9 is a diagram showing a procedure for creating a power pattern under different conditions from a measured power pattern
FIG. 10 is a characteristic diagram illustrating demand power control in the power monitoring apparatus according to the embodiment.
FIG. 11 is a diagram showing the relationship between the characteristics of each manufactured product and the power used
FIG. 12 is a diagram showing the relationship between the electric power used and the production amount of each manufactured product
FIG. 13 is a diagram for explaining a conventional scheduling method;
FIG. 14 is a diagram showing a general contract power pattern
FIG. 15 is a characteristic diagram showing demand power control in a conventional power monitoring apparatus.
[Explanation of symbols]
1 ... Receiving room
2a, 2b ... adjustment target device
5 ... Process person in charge
7. Power monitoring device
9 ... Scheduling device
10 ... Production management system
11 ... Process person in charge

Claims (6)

For each product to be manufactured in the factory, a product master file that stores the required time for manufacturing the product, the power used for manufacturing the product, and the manufacturing attributes;
A contract power pattern memory for storing a contract power pattern composed of contract power given for each time period in a predetermined schedule period in the factory;
Product grouping means for grouping each product stored in the product master file into a plurality of product groups having similar specifications and characteristics, and obtaining power consumption and manufacturing time for each product group;
Production of a product group with a low power consumption from a production time of a product group with a high power consumption from a time zone with a high contract power to a time zone with a low contract power in each time zone of the contract power pattern stored in the contract power pattern memory Production time allocation means for allocating time in order;
When manufacturing time is assigned to multiple product groups in the same time zone by this manufacturing time allocation means, the manufacturing time of each product group within this time zone is allocated based on the constraints on the manufacturing order between the product groups. Time zone allocation means to attach,
A production scheduling apparatus comprising: product group assignment means for assigning the production time of each product belonging to each product group within the assigned production time of the product group to which the product group belongs.   When the manufacturing time of each product group assigned to each time slot by the manufacturing time assigning means and the time zone assigning means has a time gap between adjacent products, each time within the schedule period The production scheduling apparatus according to claim 1, further comprising an allocation adjusting unit that packs over the band boundaries. When each product is actually manufactured, the number of pulses per unit time of the pulse signal output each time the unit power is used from the power meter is measured, and the number of pulses is multiplied by the unit power. Seeking power,
Calculate the power consumption pattern from the start of production to the end of production of the product from the power consumption at each time,
3. The production scheduling apparatus according to claim 1, wherein the power consumption of each product registered in the product master file is obtained from the calculated power consumption pattern. The product attribute includes the production amount of the corresponding product,
The manufacturing time allocating means allocates the manufacturing time of each product to a contract power time zone corresponding to the power used with reference to the manufacturing amount of the corresponding product. The production scheduling apparatus according to item.   Planned power consumption calculation for calculating the planned power consumption at each time within each time zone from the power usage of each product stored in the product master file in each time zone of the contract power pattern to which the production time of each product is assigned The production scheduling apparatus according to claim 1, further comprising means.   Check the progress of manufacturing at each time after the start of manufacturing in the factory, and estimate the power consumption of each product manufactured from each time to the schedule period end time from the time to the schedule period end time. The production scheduling apparatus according to claim 5, further comprising predicted usage power calculation means for calculating usage power.

Images