JP5290818B2 - Tire molding instruction allocation method - Google Patents

Description

  The present invention relates to a method for assigning a tire molding command that enables efficient tire manufacturing.

For tires, a member manufacturing process for manufacturing members such as plies, beads, breakers, and treads, a tire forming process for forming raw tires (green tires) by pasting the members together, and manufacturing tires by vulcanizing the raw tires It is manufactured through a vulcanization process to be performed and an inspection process to inspect the product tire. That is, a tire manufacturing process includes a member manufacturing process for manufacturing a member with various member manufacturing machines, a tire molding process for forming a raw tire with a molding machine, a vulcanization process for vulcanizing a raw tire with a vulcanizer, and various inspections. An inspection process for inspecting a product tire using a machine, an inspection tool, or the like is provided (see Patent Document 1).
The tire production plan is determined in the reverse order of the tire production process. That is, first, a vulcanization plan for vulcanizing raw tires of various sizes (sizes and types) is made, and a molding plan for molding raw tires of various sizes is made based on the vulcanization plan. Based on the molding plan, a member manufacturing plan is made. In the tire molding process, raw tires of various sizes are molded by a plurality of types of molding machines. In this case, since the size of a tire that can be molded is determined for each molding machine, a tire molding command for each tire size is assigned to a molding machine that can execute the tire molding command.

JP-A-11-129344

Conventionally, for example, there has been a first molding machine that can execute a pre-assignment tire molding command before being assigned to the molding machine, and the first molding machine has already assigned a tire molding command to the limit of the capacity of the molding machine. And there is a second molding machine capable of executing a tire molding command already assigned to the first molding machine, the load capacity of the second molding machine is empty. Nevertheless, since it was determined that the pre-assignment tire molding command was not assignable, there was a problem that each molding machine could not efficiently form tires.
The present invention has been made in view of the above-described problems, and allows each molding machine to efficiently mold a tire so that the efficiency of tire manufacture can be improved.

In the tire molding command allocation method according to the present invention, there are a plurality of molding machines capable of executing a tire molding command before allocation before being allocated to the molding machine, and each of the molding machines already has the capability of each molding machine. A tire molding command is allocated to the limit, and the tire molding command before allocation to the one molding machine is released by releasing the allocation of the tire molding command already allocated from one molding machine of the plurality of molding machines When assigning tires, assign the evaluation score to each molding machine when assuming that the pre-allocation tire molding command is allocated to each of the molding machines, and the allocation evaluation score is the tire molding that the molding machine has already been allocated. Supply to the molding machine and consumption time required for equipment switching and equipment adjustment of the molding machine when executing the command and when executing the tire molding command that the molding machine is newly assigned The higher the consumption time required for switching of the member does not increase greatly, since assignment allocation before tire molding instructions to a large molding machine allocation of merit, can be reduced time consumption. Therefore, it is possible to reduce the number of molding commands that are determined not to be assigned, and the tires can be efficiently molded by each molding machine, so that the efficiency of tire manufacture can be improved.
Since the one molding machine is the first molding machine and the allocation canceling tire molding command released from the first molding machine is allocated to the second molding machine, the molding command is determined not to be allocated. Therefore, it is possible to reduce the remainder of the load capacity of each molding machine (empty load capacity), and it is possible to cause each molding machine to efficiently mold a tire, and to improve the efficiency of tire manufacture.
In another tire molding command allocation method according to the present invention, there are a plurality of first molding machines capable of executing a pre-allocation tire molding command before being allocated to the molding machine, and each of the first molding machines already has Tire molding instructions are allocated to the limit of the capacity of each molding machine, and by canceling the allocation of the tire molding instructions already allocated from one first molding machine of the plurality of first molding machines Among a plurality of second molding machines capable of allocating a pre-allocation tire molding command to the one first molding machine and executing an allocation-released tire molding command whose allocation has been canceled by the one first molding machine When allocating the unassigned tire molding command to one second molding machine, it is assumed that the pre-allocation tire molding command is allocated to each of the plurality of first molding machines. Assignment review In addition to assigning points, the assignment evaluation score is assigned to each second molding machine when it is assumed that the assignment cancellation tire molding instruction is assigned to each of the plurality of second molding machines. Switching between the molding machine's equipment switching and equipment adjustment, and the switching of the components supplied to the molding machine when the assigned tire molding command is executed and when the molding machine executes the newly assigned tire molding command Select a pair of molding machines with a large total score when the allocation evaluation score for the pair of first molding machines and the allocation evaluation score for the second molding machine are totaled. The pre-assignment tire molding command is assigned to the first molding machine of the pair of molding machines having a large total score, and the allocation cancellation tire molding life is assigned to the second molding machine of the pair of molding machines having the large total score. Because it can reduce the number of molding commands that are determined not to be allocated, the load capacity of each molding machine can be reduced, and the consumption time can be reduced, so each molding machine can efficiently mold tires. This can improve the efficiency of tire manufacture.

Explanatory drawing of the tire shaping command allocation method (form 1). Explanatory drawing of the tire shaping command allocation method (form 1). Explanatory drawing of the tire shaping command allocation method (form 1). Explanatory drawing of the tire shaping command allocation method (form 1). Explanatory drawing of the tire shaping command allocation method (form 2). The figure which shows an example of the result evaluated using the allocation evaluation score which considered all the allocation evaluation items (1)-(6) (form 3).

Form 1
In the tire molding command allocation method of this embodiment, there is a first molding machine capable of executing a pre-allocation tire molding command before being allocated to the molding machine, and the first molding machine already has a limit on the capability of the molding machine. From the first molding machine on the condition that there is a second molding machine that can execute the tire molding command that is already assigned to the first molding machine. By canceling the assignment of the assigned tire forming instruction, the pre-assignment tire forming instruction is assigned to the first forming machine, and the assignment releasing tire forming instruction released from the first forming machine is assigned the second Assign to the molding machine.
That is, the allocation cancellation tire molding command that has been allocated from the first molding machine is allocated to the second molding machine, and instead of the allocation cancellation tire molding command that has been allocated to the first molding machine, the first molding is performed. Allocate pre-assignment tire molding instructions to the machine.

  Hereinafter, based on FIG. 1 thru | or FIG. 3, the tire shaping command allocation method by the form 1 is demonstrated concretely. 1 to 3, if the hatching of the cross section of the rectangular frame indicating the molding machine is the same as the hatching of the round cross section indicating the tire molding command, the molding machine can execute the tire molding command of the same hatching. Indicates that Here, two types of tire molding instructions can be executed, and in order to execute molding within a single molding plan, a molding machine that is limited in capacity by being assigned four molding instructions is taken as an example. explain.

  For example, FIG. 1 includes a plurality of first molding machines 1a; 1b; 1c; 1d that are capable of executing a tire molding command of a size for starting a new vulcanization (hereinafter referred to as a new starting size tire molding command). In the first molding machines 1a to 1d, the new start size tire molding command 2a and the other tire molding commands 2b; 2c; 2d were already allocated up to the limit of the capacity of each molding machine and were not allocated. It shows a state in which a new start size tire molding command (hereinafter referred to as pre-assignment tire molding command) 2A (2a) remains. That is, in order not to cancel the tire molding instructions 2b; 2c; 2d that have already been assigned to the plurality of first molding machines 1a to 1d, the tire molding instructions 2A that are no longer allocated are left to the plurality of first moldings. This is a state in which it cannot be assigned to the machines 1a to 1d. Further, although the new start size tire molding command 2a cannot be executed, a plurality of second molding machines 1e; 1f; 1g capable of executing the tire molding commands 2b; 2c; 2d other than the new start size tire molding command are provided. Yes, the plurality of second molding machines 1e to 1g still have sufficient capacity, and it is possible to newly assign tire molding instructions.

Next, as shown in FIG. 2, as candidate molding machines to which the pre-allocation tire molding command 2A is allocated, a plurality of first molding machines (hereinafter referred to as previous machines) 1a capable of executing a new start size tire molding command; Select 1b; 1c; 1d.
Next, as shown in FIG. 3, a plurality of second molding machines (hereinafter referred to as subsequent machines) 1e capable of executing a tire molding command other than a new start size tire molding command already assigned to each previous machine; 1f; 1g is selected.
Therefore, if there are multiple previous units and multiple subsequent units, the pre-assigned tire molding command 2A is assigned to the previous unit by releasing the tire molding command already assigned to the previous unit, and is also released from the previous unit. As shown in FIG. 4, there are a plurality of combinations of the preceding machine, the unassigned tire forming instruction, and the subsequent machine when the assigned release tire molding instruction is assigned to the subsequent machine (six kinds in FIG. 4). The combination of was exemplified).

  In Form 1, any one combination of the preceding machine, the unassigned tire forming command, and the succeeding machine is arbitrarily selected, and an unassigned tire forming instruction selected from among a plurality of unassigned tire forming instructions 2b; 2d; The pre-assignment tire forming instruction 2A is assigned to the preceding machine selected from among the plurality of preceding machine 1a; 1b; 1c; 1d.

  According to the first aspect, in the case where a tire molding command has already been allocated to the plurality of first molding machines capable of executing the tire molding command 2A before allocation up to the limit of the capability of each molding machine, Since it is possible to assign the pre-assignment tire molding command 2A that has been determined to be possible, the number of tire molding commands that are determined not to be allocated is reduced, and the remaining load capacity (empty load capacity) of each molding machine can be reduced. Thus, tires can be efficiently molded by each molding machine, and the efficiency of tire manufacturing can be improved.

  Although not shown in the figure, even if there is only one combination of the previous machine, the unassigned tire molding command, and the subsequent machine, one unassigned tire molding command is assigned to one subsequent machine, and one before the assignment to one previous machine. Assign tire molding instructions. In other words, there is one each of the preceding machine and the following machine, and it is possible to assign the unassigned tire forming command released from the assignment to the one succeeding machine, and the pre-assignment tire molding. Even when an instruction can be assigned to one preceding machine instead of an assignment cancellation tire molding instruction, the above-described effect of form 1 can be obtained by the assignment method according to form 1.

Form 2
In Form 1, by arbitrarily selecting one combination of the preceding machine, the unassigned tire molding command, and the subsequent machine, the selected unassigned tire molding command is assigned to the selected succeeding machine, and the selected previous machine Although the pre-assignment tire molding command was assigned, depending on the combination of the previous machine, the unassigned tire molding command, and the subsequent machine, it may be necessary to switch the molding machine's equipment switching, the time required for equipment adjustment, and the switching of the parts supplied to the molding machine. It may increase the time required.
In view of this, Mode 2 provides a method of selecting a combination of the preceding machine, the allocation release tire molding command, and the succeeding machine that can reduce the consumption time.

In form 2, as shown in FIG. 5, the allocation of each tire molding command (tire molding command other than the new start size tire molding command) that has already been allocated to each previous unit is released to each previous unit. Assuming that each unassigned tire molding command released from Unit No. was assigned to each succeeding unit, the allocation evaluation score Y to each subsequent unit was calculated, and instead of each unassigned tire forming command, The assignment evaluation score X to each previous machine of the pre-assignment tire forming instruction when it is assumed that the pre-assignment tire forming instruction is assigned to the previous car is obtained.
Then, as shown in FIG. 5, the pair of the preceding machine and the subsequent machine having the maximum sum total of the allocation evaluation score X and the allocation evaluation score Y is determined as the allocation target molding machine.
That is, as shown in FIG. 5C, the pre-assignment tire molding command 2A is assigned to the preceding machine 1c of the combination having the maximum total score of “24 points”, and after the combination having the maximum total score. The allocation cancellation tire molding command 2c is allocated to the machine 1g.

Hereinafter, how to assign the allocation evaluation score will be described.
For example, an allocation evaluation score is assigned in consideration of the following allocation evaluation items (1) to (5). That is, a pair of preceding machine and subsequent machine of the combination having the maximum sum of the assigned evaluation scores calculated in the assigned evaluation items (1) to (5) are determined as the molding machines to be assigned.

(1) Tire size The tire size to be molded according to the pre-assignment tire forming order when the pre-assignment tire forming instruction is assigned to each previous machine, and the pre-assignment tire forming instruction. Is assigned to the previous machine, it is determined by whether the size of the tire to be molded is the same as the allocation release tire molding command to cancel the allocation to the previous machine. In addition, the assigned evaluation score for each subsequent release machine molding order is assigned to the size of the tire molded by each assigned release tire molding order when the assignment to each previous machine is released, and each assigned release tire molding. It is determined by whether or not the size of the tire molded by each tire molding command already allocated to each subsequent machine when the command is allocated is the same. If the sizes are the same, the score is “1”. If the sizes are not the same, the score is “0”. If the sizes are different, it is necessary to switch the molding machine and the members, and the switching time (consumption time) increases. Therefore, it is possible to realize the allocation that can reduce the switching time as much as possible. That is, if the allocation evaluation score is “0”, the consumption time required for switching the machine and adjusting the molding machine and the consumption time required for switching the members supplied to the molding machine are increased, and the allocation evaluation score is “1”. If so, the consumption time required to switch the machine and adjustment of the molding machine and the consumption time required to switch the components supplied to the molding machine will be reduced. By doing so, the tire can be efficiently molded by each molding machine, and the efficiency of tire manufacturing can be improved.

(2) 1st drum width dimensions When assuming that the pre-assignment tire molding command is assigned to each previous machine, the pre-assignment tire molding instruction is assigned to each previous machine. The variation of the width dimension of the 1st drum is obtained, and it is determined by whether or not the variation is large. The allocation evaluation score for each subsequent machine of the allocation cancellation tire molding order is determined in the same manner.
The 1st drum is a molding drum for molding a carcass, a side, and a bead which are inner portions of a tire.
The molding machine molds one green tire using a plurality of members. The member is carried along the guide to the 1st drum. At this time, since the width of the member differs depending on the size of the tire to be molded, the guide needs to be adjusted every time the size is switched. If the width is different between several sizes, the width of the guide must be changed. Such a change in the guide width increases the switching work as compared with a case where a green tire having a certain size is molded. Therefore, it is said that it is good to collect the size which uses the member of the same size for one molding machine. However, it is difficult to confirm all the widths of a plurality of members present at the time of assignment. Here, it is known that the width of the first drum has a correlation with a specific member. Therefore, it is not necessary to look at the width of the plurality of members, and it can be compensated by looking at the width of the first drum. In summary, when molding a plurality of sizes, if the difference in the numerical value of the width dimension of the first drum used in the molding is small, the difference in the width of a specific member is also small, without changing the guide width. This means that the switching work can be reduced. There is also an advantage that the switching work of the first drum itself can be reduced.
This will be specifically described. When it is assumed that the pre-assignment tire molding command is assigned to each previous machine, the sample dispersion value (hereinafter simply referred to as the dispersion value) of the width dimension of the 1st drum used for molding is obtained for each previous machine, and the dispersion value is Allocation evaluation score for the previous unit is “0”, the allocation evaluation score for the previous unit with the smallest variance value is “1”, and the allocation evaluation for the previous unit that shows variance values other than the maximum and minimum values The score is determined by the ratio of the variance value to the maximum value and the minimum value of the variance values. That is, a score is assigned to each previous machine in the numerical range from 0 to 1. The allocation evaluation score for each subsequent machine of the allocation cancellation tire molding order is determined in the same manner. In this case as well, if the allocation evaluation score is large, the consumption time required for equipment switching and equipment adjustment of the molding machine and the consumption time required for switching the members supplied to the molding machine are reduced. By setting the molding machine to be assigned, tires can be efficiently molded by each molding machine, and the efficiency of tire manufacturing can be improved.

(3) Peripheral size of BT drum BT used for molding for each previous machine when it is assumed that the pre-assignment tire molding command is assigned to each previous machine and the pre-assignment tire molding instruction is assigned to each previous machine. The variation in the peripheral size of the drum (2nd drum) is obtained, and it is determined by whether or not the variation is large. The allocation evaluation score for each subsequent machine of the allocation cancellation tire molding order is determined in the same manner.
The BT drum is a drum for molding a tire belt member or a tread member. The BT drum is adjusted to match the BT circumference set in the molding process when the size is switched. When making adjustments, wear a jig called a segment. Each segment has a permissible range. If the permissible range is exceeded by switching the size, the segment is switched to another segment. At this time, it is possible to reduce the segment switching work by collecting the same size of the BT circumference in one unit.
This will be specifically described. Assuming that the pre-assignment tire molding command is assigned to each previous machine, obtain the dispersion value of the peripheral size of the BT drum used for molding for each previous machine, and assign the assigned evaluation score to the previous machine where the dispersion value is maximum “0”, the assigned evaluation score for the previous unit with the smallest variance value is “1”, and the assigned evaluation score for the previous unit showing a variance value other than the maximum and minimum values is the variance value. It is determined by the ratio of the maximum value and the minimum value of. That is, a score is assigned to each previous machine in the numerical range from 0 to 1. The allocation evaluation score for each subsequent machine of the allocation cancellation tire molding order is determined in the same manner. In this case as well, if the allocation evaluation score is large, the time required for switching the equipment and adjusting the equipment of the molding machine will be reduced. Therefore, by assigning the molding machine that will be allocated to reduce this time to each allocation machine, The tire can be efficiently molded, and the efficiency of tire production can be improved.

(4) Number of member switching When the pre-assignment tire molding command is assigned to each previous unit, assuming that the pre-allocation tire molding command is allocated to each previous unit, the number of member switching is calculated for each previous unit. This is determined by whether the number of times of switching is large. The allocation evaluation score for each subsequent machine of the allocation cancellation tire molding order is determined in the same manner.
Multiple sizes are assigned to one molding machine. When actually molding, the plurality of sizes are molded in order. When a member that has been used for a size that has been molded so far is also used for a size that is to be molded next, there is no need for switching operation for that member. Therefore, the switching time is shortened and productivity is improved. Moreover, it can also be avoided that a member remains halfway. Collecting sizes that use the same member in one unit has the above-mentioned merit. Therefore, the number of times of switching the member is set as a determination item.
This will be specifically described. Assuming that the pre-assignment tire molding command is assigned to each previous machine, the number of times of switching of the member is obtained for each previous machine, the assignment evaluation score for the previous machine where the number of times of change is the maximum is “0”, and the number of times of change is The assigned evaluation score for the previous machine that is the smallest is “1”, and the assigned evaluation score for the previous machine that indicates the number of switchings other than the maximum and minimum values is the maximum and minimum of the number of switching times. It depends on what percentage it is. That is, a score is assigned to each previous machine in the numerical range from 0 to 1. The allocation evaluation score for each subsequent machine of the allocation cancellation tire molding order is determined in the same manner. In this case, if the allocation evaluation score is large, the consumption time required for switching the member is reduced. Therefore, by forming a molding machine to be allocated that can reduce this time, the molding machine is efficiently molded by each molding machine. The tire manufacturing efficiency can be improved.

(5) Achievements The assignment evaluation score for each previous machine of the pre-assignment tire molding instruction is determined by whether or not there is a past record in which the same molding instruction as the pre-assignment tire molding instruction has been assigned to each previous machine. In addition, the number of evaluation points assigned to the subsequent machine of each allocation release tire molding instruction is determined by whether or not the same molding command as that of each allocation cancellation tire molding instruction has been assigned to each subsequent machine in the past.
If there is a track record assigned in the past, there is no need to make fine adjustments such as jigs and tools for molding machines. Therefore, there are merits that the switching time is shortened and green tires with stable quality can be molded as compared with the case of allocating to a molding machine with no track record.
If there is an allocation record, the score is “1”, and if there is no allocation record, the score is “0”. If the allocation evaluation score is “1”, the time required for adjusting the molding machine equipment will be reduced. Therefore, it is more efficient for each molding machine by assigning molding machines that can be allocated to reduce the consumption time. The tire can be molded to improve the efficiency of tire manufacture.

Form 3
The allocation evaluation points are assigned in consideration of the allocation evaluation items (1) to (5) described in the second embodiment and the next allocation evaluation item (6). That is, a pair of preceding machine and succeeding machine in which the total sum of the assigned evaluation scores calculated in the assigned evaluation items (1) to (6) is maximized is determined as a molding machine to be assigned.
(6) Execution waiting time Whether or not the tire molding command of the size previously molded by each previous machine that assigns the pre-allocation tire molding command to the allocation evaluation score for each previous car of the pre-allocation tire molding command is completed. Decide on. In addition, the allocation evaluation score to the subsequent machine of each allocation release tire molding instruction is determined by whether or not the tire molding instruction of the size previously molded by each subsequent machine that allocates each allocation cancellation tire molding instruction has been completed.
The score is “1” when the tire molding command is completed, and the score is “0” when the tire molding command is not completed. If the allocation evaluation score is “1”, the waiting time for executing the tire molding instruction can be minimized, so that the molding machines that are allocated to reduce this time can be allocated to the tires more efficiently by each molding machine. Can be molded, and the efficiency of tire manufacture can be improved.

An example of the result evaluated using the allocation evaluation score considering all the allocation evaluation items (1) to (6) is shown in FIG. In this example, the pre-assignment tire molding command “AA” is assigned to the previous machine “C” of the combination that has the maximum sum of the assigned evaluation scores of “6.41”, and the total score becomes the maximum. The allocation release tire molding command “A-3” is allocated to the subsequent machine “G” of the combination.
Therefore, since the pre-assignment tire forming instruction “AA” can be assigned, the number of forming instructions determined not to be assigned can be reduced, and the assigned release tire forming instruction “A-3” can also be assigned. The excess load capacity of the molding machine can be reduced. Moreover, since the total score of the assigned evaluation scores is the maximum, the consumption time can be reduced. Therefore, a tire can be efficiently molded by each molding machine, and the efficiency of tire manufacture can be improved.

Form 4
An allocation evaluation score considering at least one of the allocation evaluation items (1) to (6) may be used. In the assignment evaluation items (1) to (6), the assignment evaluation items with the smaller numbers are more effective in reducing the consumption time. Therefore, the importance as the assignment evaluation items is considered to be greater as the assignment evaluation items with the smaller numbers.

Form 5
There are multiple molding machines that can execute pre-assignment tire molding instructions before being assigned to molding machines, and each of the molding machines has already been assigned tire molding instructions to the limit of the capacity of each molding machine, When allocating the pre-assignment tire forming command to the one molding machine by releasing the assignment of the tire forming command already assigned from one of the plurality of molding machines, When assigning to each of multiple molding machines, assign an evaluation score to each molding machine. The allocation evaluation score is the same as when the molding machine executes a tire molding command that has already been assigned. When the tire molding command assigned to the machine is executed, the consumption time required for equipment switching and equipment adjustment of the molding machine and the consumption time required for switching the material supplied to the molding machine are increased. And as large as not, it was assigned the allocation before tire molding instruction to large molding machine of the allocation evaluation score.
That is, when allocating the tire molding command before allocation to the molding machine, instead of releasing the allocation of the tire molding command from the molding machine where the tire molding command has already been allocated to the limit of the capacity of each molding machine, By allocating to the molding machine that does not increase the consumption time with reference to the allocation evaluation score, the consumption time can be reduced, the tire can be efficiently molded by each molding machine, and the efficiency of tire manufacturing can be improved.
In the fifth embodiment, the allocation cancellation tire molding command can be allocated to the molding machine in the next tire molding plan.

  The present invention assigns tire molding instructions from the beginning in the molding plan, and when it becomes impossible to allocate tire molding instructions to any molding machine from the middle, it is possible to improve the efficiency of tire production. Reassignment can be realized.

1a-1g molding machine, 1a-1d first molding machine, 1e-1g second molding machine,
2A Pre-allocation tire molding command, 2b; 2c; 2d Allocation release tire molding command,
X Allocation evaluation score to the first molding machine, Y Allocation evaluation score to the second molding machine.

Claims (3)

There are multiple molding machines that can execute pre-assignment tire molding instructions before being assigned to molding machines, and each of the molding machines has already been assigned tire molding instructions to the limit of the capacity of each molding machine, When allocating the pre-assignment tire molding command to the one molding machine by releasing the allocation of the tire molding command already allocated from one molding machine of the plurality of molding machines,
When assigning the pre-assignment tire molding instructions to each of a plurality of molding machines, assign the evaluation score to each molding machine,
The allocation evaluation score is calculated based on the time required for equipment switching and equipment adjustment of the molding machine, when the molding machine executes a tire molding command that has already been allocated, and when the molding machine executes a tire molding command that is newly allocated. Increase the consumption time required for switching the material supplied to the molding machine so that it does not increase,
A tire molding command allocation method, wherein a tire molding command before allocation is allocated to a molding machine having a large allocation evaluation score.   The said one molding machine is made into the 1st molding machine, The allocation cancellation | release tire molding command from which allocation was canceled from the said 1st molding machine was allocated to the 2nd molding machine, The Claim 1 characterized by the above-mentioned. Tire molding instruction allocation method. There are multiple first molding machines that can execute pre-assignment tire molding instructions before being assigned to the molding machines, and each of the first molding machines has already assigned tire molding instructions to the limit of the capacity of each molding machine. The tire molding pre-assignment to the one first molding machine is canceled by releasing the assignment of the tire molding command already assigned from one first molding machine among the plurality of first molding machines. The allocation-released tire is assigned to one second molding machine among a plurality of second molding machines that can execute an allocation-release tire molding command that is assigned and released from the one first molding machine. When assigning molding instructions,
When it is assumed that the pre-assignment tire forming instruction is assigned to each of the plurality of first molding machines, the assignment evaluation score is assigned to each first molding machine, and the assignment cancellation tire molding instructions are assigned to the plurality of second molding machines. Assigning the evaluation score to each second molding machine when it is assumed that each is assigned,
The allocation evaluation score is calculated based on the time required for equipment switching and equipment adjustment of the molding machine, when the molding machine executes a tire molding command that has already been allocated, and when the molding machine executes a tire molding command that is newly allocated. Increase the consumption time required for switching the material supplied to the molding machine so that it does not increase,
Select a pair of molding machines having a large total score when summing the allocation evaluation score to the pair of first molding machines and the allocation evaluation score to the second molding machine, and select a pair of molding machines having a large total score. A tire molding instruction characterized by allocating a pre-allocation tire molding command to one of the first molding machines and allocating an unassigned tire molding command to a second molding machine of a pair of molding machines having a large total score. Assignment method.

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