JP2001232409A - Method for designing slab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for designing a slab by which the unit weight of the slab is increased without increasing the surplus part of the slab which is not alloted by the time of the final process when designing the slab to the order of prescribed manufacturing specifications of a received order when a sheet product such as a coil is manufactured in the steel industry. SOLUTION: This method for designing the slab includes a process where, when deciding the weight of the slab, whether an order lot of manufacturing specifications different from the prescribed manufacturing specifications which can be alloted for the surplus part to the order lot of the prescribed manufacturing specifications is present in the order lot group of the prescribed manufacturing specifications which is received by the time the order lot of the prescribed manufacturing specifications is ordered or not is automatically decided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is applied to the final step of designing a slab for an order of a prescribed manufacturing specification when manufacturing a thin product such as a coil in the steel industry. It is an object of the present invention to provide a slab design method capable of increasing a slab single weight without increasing a slab surplus part without a slab.

[0002]

2. Description of the Related Art Steel manufacturers have been producing thin products such as coils in a custom-made production system. According to this order-made production method, when an order is received from a customer, a production line is instructed to produce a thin sheet product according to the order, and the production line is manufactured and processed on the production line according to the instruction. In the process, a predetermined quantity of sheet products of a kind and weight that can satisfy the customer's order are collected and delivered to the customer by a specified delivery date.

When designing a slab in this order-made production system, a slab surplus portion in the final process is reduced as much as possible from the viewpoint of preventing a decrease in yield and improving production efficiency, and a slab unit is formed from the viewpoint of reducing the manufacturing cost. It is desirable to design so as to increase the weight. For the purpose of minimizing the excess slab in the final step and increasing the single weight of the slab, conventionally, for example, a thin plate production management method disclosed in JP-A-7-204996 and JP-A-10-214104 are disclosed. A slab design method disclosed in the official gazette has been proposed.

[0004] Among these, the thin plate production management method disclosed in Japanese Patent Application Laid-Open No. 7-204996 determines the order form based on the order size and the continuity of the order of the thin plate product, and orders a small lot and repeats. Find out whether the order belongs to a lot order or a non-repeat large lot order, and the determined lot order is subjected to provisional material knitting, and for each knitting, the design product unit is evaluated by performance evaluation based on a unique evaluation formula. Weight is determined.

That is, in the case of a small lot order, the evaluation value = the product single weight deviation value + the partial surplus amount is used, and the one with the minimum value is adopted as the product design value. In the case of a repeat large lot order, the difference between the slab unit weight upper limit and the design material unit weight is compared with the difference between the product unit weight upper limit and the design unit weight upper limit, and the order is designed based on the smaller difference. In the case of a non-repeat large lot order, the evaluation value = the slab single weight deviation value + the product single weight deviation value + partial surplus amount is used, and the one with the minimum value is adopted as the product design value.

In the slab design method disclosed in Japanese Patent Application Laid-Open No. 10-214104, when it is determined that there is an order lot continuously receiving orders with the same manufacturing specifications, one of the enlarged slabs is set as the order lot. At the time of assignment, if there is no surplus, the enlarged slab is assigned. If there is surplus, order lots are sequentially assigned to one type of enlarged slab having the largest width and length, This is to eliminate surplus.

[0007]

However, in the thin plate production management method disclosed in Japanese Patent Application Laid-Open No. 7-204996, in the case of small lot order, the evaluation value = the product single weight deviation value + the partial surplus amount. Using, in the case of a repeat large lot order, compare the difference between the slab unit weight upper limit and the design material unit weight, and the difference between the product unit weight upper limit and the design unit weight upper limit, and based on the smaller difference, In the case of a non-repeat large lot order, since the product design is performed using the evaluation value = slab single weight deviation value + product single weight deviation value + partial surplus, the slab single weight does not always increase.

In the slab design method disclosed in Japanese Patent Application Laid-Open No. 10-214104, it is determined only whether or not there is an order lot continuously receiving orders with the same manufacturing specifications. However, even if there are past, present, and future order lots with different manufacturing specifications for the ordered lot, the order lots with different manufacturing specifications are not considered in slab design. For this reason, even if there are past, present, and future order lots with different manufacturing specifications for the ordered lot, it is determined that there is no order lot that is continuously receiving orders with the same manufacturing specification. In this case, the slab to be designed is a standard slab having a smaller weight than the enlarged slab. For this reason, even if there is an order lot with different manufacturing specifications in the past, present, and future with respect to the ordered lot, the unit weight of the slab is reduced, resulting in an increase in manufacturing cost.

In actual production of a thin plate, not only an order lot having the same production specification as an ordered lot but also different production specifications (for example, product thickness, plate width, plating adhesion amount, steel type, etc.). Production is performed by applying the ordered lot to the same slab. Therefore, even when there is no continuity (when there is no order lot with the same production specification), if it is predicted that there is an order lot with a different production specification that can be applied to the same slab, the surplus in the slab stage It is highly probable that the part (other than the ordered lot ordered) will be filled with the ordered lot with different manufacturing specifications before the slab reaches the final process.

Accordingly, an object of the present invention resides in an order lot group received by the order lot of the order lot currently ordered when the order lot having the same manufacturing specification is determined in determining the continuity of each order lot. In addition to determining whether or not the order lot of different manufacturing specifications that can be applied to the surplus part of the slab is in the order lot group received by the time of ordering the order lot that was actually ordered, it is also automatically determined, To provide a slab design method capable of determining the weight of a slab based on the slab and increasing the slab single weight without increasing a slab surplus part that is not applied until the final step. is there.

[0011]

In order to solve the above-mentioned problems, a slab designing method according to claim 1 of the present invention provides a method for determining the weight of a slab, which is performed with respect to an order lot having predetermined manufacturing specifications. Automatically determining whether or not an order lot having a manufacturing specification different from the predetermined manufacturing specification that can be applied to the surplus portion is in an order lot group received up to the ordering time of the order lot for the predetermined manufacturing use. It is characterized by including.

According to a second aspect of the present invention, in the slab designing method according to the first aspect, the automatic determination is performed in consideration of at least an ordered lot weight and an ordered lot number during a predetermined period. It is characterized by. Further, in the slab designing method according to claim 3 of the present invention, in the invention according to claim 1 or 2, the manufacturing specification includes a product sheet thickness, a product sheet width, a product steel type, and a product plating amount. , Product delivery date, and product order quantity.

[0013]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a flowchart showing an outline of processing in an embodiment of a slab designing method according to the present invention. FIG. 2 is a flowchart showing an outline of a process for determining continuity. FIG. 3 is an explanatory diagram for describing a specific example of the process of step 105b.

The processing to be described hereinafter is actually executed by a process computer for a steel sheet production line in the steel industry, and a program required for the processing is stored in a memory or the like in the process computer in advance. FIG.
Is started, in step 101, it is selected whether the maximum slab weight or the maximum product weight is selected. Next, in step 102, it is determined whether or not there is a surplus in the slab as a result of applying the order lot for which an order has actually been received to one slab.
If this determination is "NO", in step 108, a slab having the slab weight (no surplus) determined in step 101 is designed, and the processing in FIG. 1 ends.

On the other hand, the determination in step 102 is "Y
In the case of "ES", the process proceeds to step 103, where a search is made for an order lot to be applied in the slab (excess part of the slab) and a determination is made as to whether or not the order lot can be applied, by referring to the database storing the order lot. , In terms of product thickness, width, steel type, coating weight, and weight. Next, the process proceeds to step 104 to determine whether or not there is an order lot to be combined and applied, that is, a determination to exclude an order lot that has already been manufactured or an order lot for which an instruction has been determined, that is, to manufacture from now on. It is determined whether or not there is a planned order lot. If this determination is “YES”, it is determined in step 109 that the slab having the slab weight (combined allocation) determined in step 103 is designed. 1 is terminated.

On the other hand, the determination in step 104 is "N
In the case of "O", that is, in the case of an order lot that has already been manufactured or an order lot that cannot be changed in process, that is, if there is no order lot to be manufactured in the future, the process proceeds to step 105, and the order is received. The continuity is determined based on the data of the order lot received up to the time of ordering the order lot. The process for determining the continuity will be described in detail with reference to the flowchart of FIG.

First, if it is determined in step 104 that there is no order lot to be applied for combination, step 1
At 05a, based on a database storing order lot groups received up to the time of ordering of the currently ordered order lot, an order lot of the same manufacturing specification as the ordered lot is received until the order time of the currently ordered order lot. It is automatically determined whether or not it is in the order lot group received in (2) (past order lot group). In this determination, the order lot weight and the number of order lots within a predetermined period are taken into consideration. Specifically, within the past month, there are 100 t or more or 3 or more order lots having the same manufacturing specifications as the order lot ordered. Is determined. If the determination is "YES", it is determined in step 105c that the order has "continuity".

On the other hand, if the determination in step 105a is "NO", the flow shifts to step 105b where an order is received based on a database storing order lots received up to the order time of the order lot actually received. It is automatically determined whether or not an order lot with a different manufacturing specification that can be applied to the surplus part of the order lot is in the order lot group (past order lot group) received up to the time of ordering the currently ordered order lot. You. In making this determination, the order lot weight and the number of order lots within a predetermined period are taken into account. Specifically, within the past month, order lots with different manufacturing specifications that can be used for the surplus part of the ordered lots Is determined to be 50t or more or twice or more. The range of the manufacturing specification in which the order lot of the different manufacturing specification can be applied to the surplus portion with respect to the received predetermined manufacturing specification is the range of the current application standard of the different manufacturing specification.
If the determination is “YES”, step 1
At 05c, it is determined that the order is "continuity", and if the determination is "NO", the order is determined to be "no continuity" at step 105d.

Step 105a and step 10
The manufacturing specifications of the ordered lot in 5b include at least the thickness of the product, the width of the product, the steel type of the product, the plating amount of the product, the delivery date of the product, and the order quantity of the product. Next, when the continuity is determined in Step 105, the process proceeds to Step 106, and it is determined whether or not the slab weight has no surplus. If this determination is “YES”, the process proceeds to Step 110. In, a slab having the slab weight (no surplus) determined in step 105 is designed. If the determination is “NO”, in step 107, the slab weight (excess) is determined in step 101. A slab is to be designed, and the processing in FIG. 1 ends.

More specifically, when the order of “with continuity” is made in step 105, it is determined in step 106 that the weight of the slab has surplus, that is, “NO” is determined. The slab having the slab weight determined in step 101, that is, the slab having the maximum slab single weight or the maximum product single weight is designed based on the prediction that the surplus portion will be allocated.

On the other hand, in step 105, "no continuity"
In step 106, it is determined that the weight of the slab has no surplus, that is, the determination of "YES" is made, and the slab weight determined in step 105, that is, the slab weight corresponding to the weight of the ordered lot ordered. Slab design is performed. Next, a specific example of the processing in step 105b will be described with reference to FIG. 3 to facilitate understanding of the invention.

As a prerequisite to step 105b, the maximum slab single weight or the maximum single product weight is selected in step 101, and as shown in FIG. 0.80m thick
m, the plate width of the product 1215Mm, steel type is A, coating weight is 45 g / mm ^2, orders amount 10t, delivery date September 10
If the order lot A of the day is received, this order lot A
Is applied to a slab having a slab single weight of 30t. in this case,
Since this slab has a surplus portion of 20 t with respect to the order lot A, a “YES” determination is made in step 102, and the process proceeds to step 103. Step 10
In step 3, it is determined whether or not there is an applicable order lot in the surplus portion. However, when the process reaches step 105b, there is no applicable order lot to be manufactured from now on. The determination of “NO” is made, and the process proceeds to the determination of continuity in step 105. Then, in step 105a, an order lot having the same manufacturing specification as the order lot A received in the past month is 10
It is determined whether there is 0t or more or 3 times or more. When reaching step 105b, "N
An "O" determination is made. Then, in step 105b, it is determined whether there is an order lot of 50t or more with different manufacturing specifications that can be used for a surplus portion of the order lot A received in the past month or not.

As shown in FIG. 3, for example, when there are a plurality of order lots including the following order lots within the past month, the range of the manufacturing specification applicable to the surplus portion is set to the sheet thickness. Is 0.65 to 0.90 mm and the board width is 1
175-1215mm, the plating adhesion amount is 30-60g /
mm ² , the order lot that can be allocated to the surplus part is
These are the order lot C and the order lot D. Then, in this case, there are two order lots with different manufacturing specifications that can be applied to the surplus portion.
A determination of "YES" is made in b, and an order of "with continuity" is made in step 105c. And step 1
At 06, the slab weight with surplus is determined, that is, "NO" is determined, and the slab weight determined at step 101, that is, the slab weight, A slab with a unit weight of 30t is manufactured.

[Order lot B] Product thickness: 1.00 mm Product width: 1150 mm Steel type: A Plating weight: 45 g / mm ² Order quantity: 20 t Delivery date: August 15 [Order lot C] Product thickness: 0.70mm Product width: 1210mm Steel type: A Plating weight: 30g / mm ² Order quantity: 20t Delivery: August 20 [Order lot D] Product thickness: 0.90mm Product width: 1195 mm Steel type: A Plating adhesion amount: 60 g / mm ² Order quantity: 20 t Delivery date: September 10 If “YES” is determined in step 105 a, the process proceeds to step 105 c. The order is “continuous”. Then, in step 106, a determination is made that the slab weight has a surplus, that is, a "NO" determination is made, and the slab weight determined in step 101 is determined based on the prediction that the surplus portion will be allocated by the final process. ,
That is, a slab having a slab single weight of 30t is manufactured.

On the other hand, if "NO" is determined in the step 105b, the order is "no continuity" in the step 105d. Then, in step 106, it is determined that the slab weight has no surplus, that is, "YES".
Is determined, and a slab having a slab weight determined in step 105, that is, a slab weight 10t corresponding to the weight 10t of the ordered lot A ordered is manufactured.

As described above, according to the present embodiment, when determining the continuity of each order lot, an order lot of the same manufacturing specification is received by the time of ordering the order lot currently ordered. Not only is it possible to determine whether or not the order lot is in the order lot, but also whether there is an order lot with different manufacturing specifications that can be applied to the surplus part of the slab in the order lot group that was received up to the time of ordering the actually ordered order lot Also, if the judgment result shows that there is an order lot with the same manufacturing specification that can be applied or an order lot with a different manufacturing specification, the surplus part is the order lot with the same manufacturing specification by the final process, or it is different. Since the slab weight is determined by predicting that the slab weight will be fulfilled in the order lot of the manufacturing specifications, the surplus portion is left in the case of an order that may eventually have a surplus portion. Produce a slab so that there is no surplus part in the middle of the process, regardless of order lots with the same manufacturing specifications and different manufacturing specifications In such a case, a slab having a large slab single weight can be manufactured. Therefore, when the thin plate is rolled from the slab, that is, at the time of the final step, the decrease in the yield due to the surplus portion remaining can be minimized, and the increase in the manufacturing cost due to the reduced single weight of the slab can be minimized. Can be minimized.

[0027]

As described above, according to the slab designing method according to the first aspect of the present invention, when determining the weight of the slab, the surplus portion with respect to the order lot of the predetermined manufacturing specification is determined. The method includes a step of automatically determining whether or not an order lot having a manufacturing specification different from the predetermined manufacturing specification that can be applied is in an order lot group received up to the time of ordering the order lot for the predetermined manufacturing use. As a result, if there is an order lot of different manufacturing specifications that can be applied, the surplus portion is determined to be applied by an order lot of different manufacturing specifications by the final process, so that the slab weight is determined. When the thin plate is rolled from the slab, that is, at the time of the final step, the slab single weight can be increased without lowering the yield due to the surplus portion remaining, and the manufacturing cost can be reduced. It can be.

Further, according to the slab designing method according to claim 2 of the present invention, in the invention according to claim 1, the automatic determination is performed in consideration of at least an ordered lot weight and an ordered lot number in a predetermined period. Therefore, an order lot of a manufacturing specification different from the predetermined manufacturing specification that can be applied to a surplus part for the order lot of the predetermined manufacturing specification,
It is possible to appropriately determine whether or not the order lot of the predetermined production use is in the order lot group received up to the time of ordering, and it is possible to reliably predict that the order lot of the different production specifications will be applied to the surplus part. The performance is improved.

Further, according to the slab designing method according to claim 3 of the present invention, in the invention according to claim 1 or 2, the manufacturing specifications include a product sheet thickness, a product sheet width, a product steel type, The applicability can be determined based on at least the amount of plating of the product, the delivery date of the product, and the amount of the order for the product.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an outline of processing in an embodiment of a slab designing method according to the present invention.

FIG. 2 is a flowchart illustrating an outline of a process for determining continuity.

FIG. 3 is an explanatory diagram for describing a specific example of a process of step 105b in FIG. 2;

Claims (3)

[Claims] When determining the weight of a slab, an order lot having a production specification different from the predetermined production specification, which can be used for a surplus portion of the order lot with the predetermined production specification, is used for the predetermined production use. A slab design method, which comprises a step of automatically judging whether or not an order lot is in an ordered lot group received up to the order point. 2. The slab designing method according to claim 1, wherein said automatic determination is performed in consideration of an order lot weight and an order lot number in at least a predetermined period. 3. The method according to claim 1, wherein the manufacturing specifications include at least a product thickness, a product width, a product steel type, a product plating amount, a product delivery date, and a product order quantity. Item 3. The slab design method according to item 1 or 2.