JP5909251B2 - Manufacturing method of laminated ring - Google Patents

Description

  The present invention relates to a method for manufacturing a laminated ring.

A laminated ring is used for a belt of a continuously variable transmission (hereinafter referred to as “CVT”) mounted on a vehicle. This laminated ring is configured by overlapping metal rings having different circumferential lengths (hereinafter simply referred to as “rings”), and has a laminated structure of 12 layers, for example.
In addition, the ring constituting each layer of the laminated ring has a ring circumference value obtained by measurement at the time of arrival. Based on this circumference value, for example, a ring group for the first layer and a ring group for the second layer , ... are divided into N-layer ring groups and stored.

By the way, although a design value is set for each ring group with respect to the circumference and diameter of the ring, a manufacturing error generally occurs, and there is a certain degree of variation around the design value for each ring group.
When a ring is randomly selected from each ring group, for example, the difference between the circumference of the first layer ring and the circumference of the second layer ring is large, and the first layer ring and the second layer ring May exceed a predetermined allowable range (hereinafter referred to as “clearance requirement”).
For this reason, by referring to the ring size data, a ring that satisfies the clearance requirement is selected from the ring group.

The ring selection process for selecting a ring satisfying the clearance requirement from each ring group is as follows.
First, a ring group for the first layer constituting the innermost layer of the laminated ring (hereinafter sometimes referred to as “ring group for the innermost layer”) or a ring for the Nth layer constituting the outermost layer of the laminated ring One ring is extracted from the group (hereinafter sometimes referred to as “ring group for outermost layer”), and that ring is set as the selection starting point.
If the ring of the innermost layer ring group is set as a selection starting point, the second layer ring group adjacent to the innermost layer (first layer) is used as a reference to satisfy the clearance requirement. Select all two-layer rings.
Next, on the basis of each of the selected second layer rings, all the third layer rings satisfying the clearance requirement are selected from the third layer ring groups adjacent to the second layer.
In this way, starting from the innermost ring, the ring is selected from the adjacent ring groups in order toward the outside, so that the ring is selected from all the ring groups and the ring set that satisfies the clearance requirements ( (Hereinafter referred to as ring set) is extracted.
When the outermost layer ring is the starting point for selection, selection is made in order from the outermost layer to the inside.

Furthermore, in the following Patent Document 1, even after one laminated ring is manufactured, a large number of ring sets that satisfy a predetermined standard requirement can be extracted from the remaining rings, and the continuation of the production of the laminated ring is stabilized. From this point of view, the ring set priority payout limitation process is performed.
The priority payout limiting process is a process of limiting to ring sets including rings belonging to the first priority class of the first priority ring group from among a plurality of ring sets satisfying all standard requirements including clearance requirements. is there.

Here, the identification of the first priority ring group and the first priority class is determined as follows.
First, each ring group is divided into a plurality of classes, and the number of rings that are preferably stored in each class of each ring group (hereinafter referred to as “target frequency”) is set in advance.
Next, the number of rings actually stored in each class of each ring group (hereinafter referred to as “inventory frequency”) is calculated.
Then, the target frequency is subtracted from the inventory frequency to calculate the number of rings that are surplus in each class of each ring group (hereinafter referred to as “surplus frequency”).
Next, the sum of the surplus frequencies is obtained by adding the surplus frequencies of each class in each ring group, the ring group having the largest sum of the surplus frequencies among all ring groups is identified as the first priority ring group, and The class having the largest surplus frequency in the first priority ring group is specified as the first payout priority class.

Japanese Patent No. 3764139

However, in the above identification method, the innermost ring group and the outermost ring group may not be identified as the first priority ring group.
Therefore, in the ring set selected to reduce the excess frequency of the ring group other than the innermost layer and the outermost ring group, the inventory frequency is lower than the target frequency in the innermost layer or the outermost ring group, There may be a class of rings with insufficient ring inventory.
The ring group for the innermost layer or the outermost layer is a ring group that is the starting point for selecting a ring in the ring selection process. When a ring is paid out from a class with a shortage of inventory, the ring is selected. There is a risk that the number of ring sets extracted in the process may be reduced, and the continuation of the production of the laminated ring may become unstable.

  Then, this invention is invention in view of the above-mentioned background, Comprising: It aims at providing the manufacturing method of a lamination | stacking ring which can stabilize the continuation of manufacture of a lamination | stacking ring.

As a means for solving the above-mentioned problem, the method for manufacturing a laminated ring according to the present invention stores the received rings by dividing them into ring groups for each layer based on the circumference value, and from the ring group for each layer. A method for manufacturing a laminated ring by selecting a ring and producing a laminated ring, wherein a ring divided into an innermost ring group or an outermost ring group is selected as a starting point, and clearance requirements from adjacent ring groups in order A ring selection step of selecting a ring satisfying the condition and extracting a plurality of ring sets, and the ring group for the innermost layer or the ring group for the outermost layer to which the ring that is the selection origin belongs as a first priority ring group In addition to specifying, the surplus in each class of the first priority ring group based on the target frequency distribution and the inventory frequency distribution The largest class is calculated surplus power which is the number of rings are specific to the first priority class, a priority payout limitation step of limiting said plurality of ring sets which includes a ring belonging to the first priority class For each ring set limited by the priority payout limiting step, the sum is calculated based on the target frequency distribution and the inventory frequency distribution by adding the surplus frequencies of the classes to which the rings constituting the ring set belong A ring set determining step for determining that the laminated ring is manufactured with a ring set having the largest sum of the surplus frequencies, and a plurality of rings constituting the ring set determined in the ring set determining step are stacked. And a laminating step for producing a laminating ring.

According to the method for manufacturing a laminated ring according to the invention, the plurality of ring sets satisfying the clearance requirement are rings belonging to the first priority class of the first priority ring group, in other words, a ring of a surplus class. Limited to what is included.
Then, in the innermost ring group or the outermost ring group specified as the first priority ring group, surplus class rings are paid out, and the number of stocks is insufficient. The situation where the class ring is paid out is avoided.
As a result, even if one laminated ring is manufactured, the reduction in the number of ring sets extracted in the ring selection process is suppressed, and the continuation of the production of the laminated ring can be stabilized.
Further, in the ring set determination step, a laminated ring is manufactured with a ring set having the largest total number of surplus rings, so that a relatively large number of surplus rings are paid out in each ring group. For this reason, in the ring groups other than the first priority ring group, it is less likely that a ring of a class whose inventory frequency is lower than the target frequency will be paid out, and the number of ring sets extracted in the ring selection process is reduced. Can be further suppressed.

  Further, the priority payout limiting step further calculates the sum of the surplus frequencies for all ring groups except the first priority ring group based on the target frequency distribution and the inventory frequency distribution, and the surplus frequency The ring group with the highest sum of frequencies is specified as the second priority ring group, and the class with the highest surplus frequency in the second priority ring group is specified as the second priority class and extracted by the ring selection step. It is preferable to limit the plurality of ring sets that are included to include both a ring belonging to the first priority class and a ring belonging to the second priority class.

According to the above configuration, since the ring set is limited to include a class of rings that are surplus in the second priority ring group, the number of rings in the second priority ring group is insufficient. The situation where the ring is paid out is avoided.
For this reason, it is possible to further suppress the reduction in the number of ring sets extracted in the ring selection step and to stabilize the production of the laminated ring.

  In addition, the priority payout limiting step is first performed when the first priority class or the second priority class is specified, and there are a plurality of candidates for the first priority class or a plurality of candidates for the second priority class. A search step of setting the first priority class or the second priority class to the base group that has the highest target frequency in the ring group, and the inventory frequency in the ring group It is determined whether or not the comparison class that is the largest class is large, and when the comparison class is larger than the reference class, the first priority class candidate or the second class from the large class toward the small class The priority class candidates are searched, and when the comparison class is smaller than the reference class, the first priority class candidate or the second priority class candidate is directed from the smaller class toward the larger class. It is preferable to search the complement.

According to the said structure, a 1st priority class or a 2nd priority class comes to be selected from the class side with many rings currently in stock, on the basis of the standard class of target frequency distribution. This eliminates the presence of a ring biased toward the large class side or the small class side with reference to the standard class of the target frequency distribution.
The class starting the search direction is the twelfth class or the first class, and a class far from the average value of the target frequencies is easily selected as the first priority class or the second priority class.

  Further, prior to the ring selection step, the storage unit includes a storage step of storing the received rings by dividing them into ring groups for each layer based on a circumference value, and the storage step measures the received rings. Then, based on the measurement step of obtaining the circumference value of the ring and the circumference value of the ring, the received rings are divided into ring groups for the respective layers, and are divided into respective classes of the ring group. Classification process, arrival frequency distribution calculating step for calculating the arrival frequency distribution indicating the arrival frequency that is the number of rings received for each class of each ring group, and the average value of the arrival frequency in the same class of all ring groups The average arrival frequency calculation step for calculating the average arrival frequency of each class and the target frequency value set for each class of each ring group by the target frequency distribution It is preferred to have a, a target power changing step of changing the average arrival frequency.

According to the above configuration, since the target frequency is changed to the average arrival frequency of the received ring, the target frequency corresponds to the actual situation of the received ring, and the distribution of the inventory frequency and the distribution of the target frequency are large. The situation of being different is eliminated.
Moreover, the target frequency of each class is unified in all ring groups. For this reason, the number of stocks of the rings of each class is unified among the respective layers, and a decrease in the number of ring sets extracted in the ring selection process can be suppressed.

  In addition, a storage period limiting step is performed after the priority payout limiting process and before the ring set determination process, in which the storage period of the ring is limited to a ring containing a ring having a predetermined storage period or more. It is preferable.

  According to the said structure, since a storage period is limited to the ring set containing a ring more than predetermined, the ring discarded after the predetermined storage period can be decreased.

  The storage step includes a storage condition conformity determination step for determining whether or not a predetermined storage condition is satisfied based on a circumference value of the ring after the measurement step; and the predetermined storage condition If it is determined that it does not conform to the above, the excluding step of excluding the received ring without storing it in the storage, and if it is determined that it conforms to the predetermined storage condition, the ring And classifying the received rings into ring groups for each layer based on the circumference value of each of the layers, and classifying each ring into each class of the ring group, and the predetermined storage condition is received It is preferable that the formed ring has a possibility of satisfying the predetermined standard requirement and being selected as a ring set.

According to the said structure, the space which can store a ring in a storage can be ensured by excluding the ring which is hard to satisfy | fill standard requirements.
Further, by excluding the rings that do not easily satisfy the standard requirements, it is possible to reduce selection objects in the ring selection process.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of a lamination | stacking ring which can stabilize the manufacture of a lamination | stacking ring can be provided.

(A) is a perspective view of the belt used for CVT which concerns on embodiment, (b) is the elements on larger scale of (a). It is a flowchart which shows each process included in the manufacturing method of the lamination | stacking ring which concerns on embodiment. It is a figure for demonstrating the target frequency distribution and inventory frequency distribution which concern on embodiment. It is a figure explaining the composition of the lamination ring manufacturing system concerning an embodiment. It is a flowchart which shows each process included in the storage process which concerns on embodiment. It is a flowchart which shows each process included in the test process which concerns on embodiment. It is a flowchart which shows each process included in the update process which concerns on embodiment. It is a graph for demonstrating target frequency distribution and inventory frequency distribution. It is a graph for demonstrating the target frequency distribution after an update. It is a graph for demonstrating the target frequency distribution which concerns on a comparative example. It is a flowchart which shows each process included in the lamination | stacking ring manufacturing process which concerns on embodiment. It is a flowchart which shows each process included in the pairing set extraction process which concerns on embodiment. It is a flowchart which shows each process included in the priority payment limitation process which concerns on embodiment. It is a flowchart which shows each process included in the search process which concerns on embodiment. It is a flowchart which shows each process included in the ring set determination process which concerns on embodiment. It is a graph for demonstrating specification of the 2nd priority class in a modification.

Next, embodiments of the present invention will be described with reference to the drawings.
First, the belt 1 used for CVT will be described.
As shown in FIGS. 1A and 1B, the belt 1 includes a pair of annular rings 3 and 3, and a plurality of elements 2 interposed between the pair of rings 3 and 3. ing.
The element 2 is a substantially H-shaped plate member in which notches for engaging with the laminated ring 3 are formed at both left and right ends. The plurality of elements 2 are annularly arranged along the pair of laminated rings 3 and 3, and both ends of the plurality of elements 2 are engaged with the pair of laminated rings 3 and 3. In FIG. 1, some elements 2 are omitted for convenience of explanation.
The laminated ring 3 is assembled by superposing a plurality (N pieces) of thin endless metal rings 4 ₁ , 4 ₂ , 4 ₃ ,..., 4 _N in the thickness direction.

In the following description, when there is no need to particularly distinguish each of the rings 4 ₁ , 4 ₂ , 4 ₃ ,..., 4 _N constituting the laminated ring 3, they are collectively referred to as a ring 4.
The plurality of rings 4 constituting the laminated ring 3 are referred to as a first layer, a second layer,..., An Nth layer in order from the innermost layer.
A set (set) of a plurality of rings 4 ₁ to 4 _N constituting one laminated ring 3 is referred to as a ring set.
Further, two ring sets constituting each of the pair of laminated rings 3 and 3 are referred to as a pairing set.

(Manufacturing method of laminated ring)
The method for manufacturing the laminated ring 3 is to produce a pair of laminated rings 3 and 3 by selecting a ring 4 that satisfies a predetermined standard requirement from a plurality of rings 4.
As shown in FIG. 2, the method of manufacturing the laminated ring 3 includes a storage step S <b> 1 in which the received ring 4 is stored in a ring group for each layer based on the circumference value, and a manufacturing instruction is issued. The ring 4 manufacturing process S5 which manufactures a pair of lamination | stacking rings 3 and 3 by selecting the ring 4 which satisfy | fills a predetermined | prescribed standard requirement from the several ring 4 stored in (3).
Also, the manufacturing method of the laminated ring 3 is such that even after the pair of laminated rings 3 and 3 are produced, a pairing set that satisfies the predetermined standard requirements can be extracted with the remaining ring 4. The purpose is to stabilize the continuation of the production of the laminated ring 3.
For this reason, in the laminated ring manufacturing process S5 of the present embodiment, it is possible to use the inventory frequency distribution and the target frequency distribution of the ring 4 without randomly selecting one pairing set from a plurality of pairing sets. Decide on one pairing set.
Hereinafter, the inventory frequency distribution and the target frequency distribution of the ring 4 will be described.

(Inventory frequency distribution)
As shown in FIG. 3, the inventory frequency distribution refers to how the inventory number of the rings 4 stored in the storage process S <b> 1 and in stock (hereinafter referred to as “inventory frequency”) for each class of each ring group. It is shown whether it is distributed. For example, in the ring group for the first layer of the present embodiment, the inventory frequency of the third class is 4, and the inventory frequency of the fourth class is 8 (see FIG. 3).
The class is divided by dividing the circumference value of the ring 4 provided for each ring group by a predetermined value, and the higher the numerical value indicating the class, the higher the ring belonging to that class. The circumference of 4 is long.
Further, in the present embodiment, for convenience of explanation, one ring group is divided into 12 classes, and the circumference value that classifies the sixth and seventh classes is used as the design value of the ring 4 of each ring group. explain.

(Target frequency distribution)
As shown in FIG. 3, the target frequency distribution is the distribution of the number of stocks in the ring 4 that are preferably stored as inventory (hereinafter referred to as “target frequency”) in each class of each ring group. It shows whether it is. For example, in the ring group for the first layer of the embodiment, the target frequency of the third class is 2, and the target frequency of the fourth class is 3 (see FIG. 3).
In addition, the target frequency of each class constituting the target frequency distribution can be changed in the update step S3 to be described later, and the class to which the design value belongs among all classes with respect to the initial value of the target frequency for the following reason. The target frequency is the largest (in this embodiment, the sixth and seventh classes, see FIG. 3).

In general, the circumference value of the ring 4 has a property of varying to some extent around the design value, but many of the received rings 4 are classified into a class to which the design value belongs in each ring group or a class close to the class. It is divided. For this reason, it is possible to extract a large number of ring sets that satisfy the clearance requirements described later by using the rings 4 that are divided into classes to which the design values of the respective ring groups belong.
Then, from the viewpoint of stabilizing the continuation of the production of the laminated ring 3, the ring 4 that is highly likely to be selected as a ring set is left in stock, and the class that is unlikely to be selected as a ring set, that is, It is preferable to actively pay out the ring 4 belonging to a class far away from the class to which the design value belongs.
From the above viewpoint, the initial value of the target frequency is set to the highest target frequency of the class to which the design value belongs among all classes (in this embodiment, the sixth and seventh classes), and the target frequency decreases as the distance from the class increases. It is set to be.

(Excess frequency)
In addition, in the present embodiment, the number of rings 4 stored in excess of the target frequency in each class is referred to as a surplus frequency. For example, in the ring group for the first layer of the present embodiment, the number of surplus frequencies in the third class is two and the number of surplus frequencies in the fourth class is five (see FIG. 3).

  The inventory frequency distribution, the inventory frequency distribution, and the surplus frequency have been described above. How to use these will be described later. Next, a stacked ring manufacturing system used in the stacked ring manufacturing method of the present embodiment will be described. The configuration of 10 will be briefly described.

(Laminated ring manufacturing system 10)
As shown in FIG. 4, the laminated ring manufacturing system 10 includes a measuring device 11 that measures a received ring 4, a storage 12 that classifies and stores the received ring 4 for each ring group, and a storage 12 A stacking device 13 that manufactures the stacked ring 3 by stacking the ring sets delivered from the control unit 14, a control device 14 that issues an operation command to each of the devices, and a database 15 that stores data. The database 15 mainly stores the inventory frequency distribution of each ring group and the target frequency distribution of each ring group.

  Next, the storage process S1 will be described.

(Storage process S1)
As shown in FIG. 5, in the storage process S1, when a plurality of rings 4 are received, an inspection process S2 for inspecting the ring 4 and the like, and all of the plurality of received rings 4 have completed the inspection process S2. The update step S3 for updating the target frequency.

(Inspection process S2)
As shown in FIG. 6, the inspection step S2 starts when the ring 4 is received (start), and the measurement step S21 for measuring the circumference value of the received ring 4 and the measured ring 4 A storage condition conformity determination step S22 for determining whether or not the storage conditions are satisfied, an exclusion step S23 for excluding the ring 4 when it is determined that the storage conditions are not satisfied (“No” in S22), and storage When it is determined that the condition is met (in the case of “Yes” in S22), there is a sorting process S24 that classifies each ring group / class of the ring 4 and a warehousing process S25 that enters the storage 12 doing.

(Measurement step S21)
The measurement step S21 is a step of measuring the circumference and plate thickness of the ring 4 received by the measuring device 11, and obtaining the circumference value and plate thickness value of the received ring 4. Further, the data of the circumference value and the plate thickness value of the ring 4 acquired by the measuring device 11 are transferred to the control device 14 and stored in the database 15.

(Storage condition conformity judgment step S22 and exclusion step S23)
The storage condition conformity determination step S22 is a step of determining whether or not the received ring 4 satisfies a predetermined storage condition based on the circumference value and the plate thickness value of the ring 4.
Here, the storage condition means that the received ring 4 may meet the standard requirements and may be selected as a ring set, and specifically, satisfy the following first to third conditions. Say.
First, the circumference value and plate thickness value of the received ring 4 correspond to the circumference value and plate thickness value of the ring 4 that has a history of being stored in the storage 12 in the past, and second, the arrival The circumference value and plate thickness value of the ring 4 that has been stored in the storage room in the past and the history of the laminated ring 3 has been accumulated, it corresponds to the circumference value and plate thickness value of the ring, and third, the arrival The ring 4 that corresponds to the ring 4 that can be assembled to meet the standard requirements with respect to the ring 4 that is currently in stock.
In the present embodiment, the control device 14 determines whether or not the storage condition is satisfied while referring to the history record recorded in the database and the data of the circumference value and the plate thickness value of the ring 4, and the storage is performed. When it is determined that the condition is not satisfied, a warning sound is generated.
Then, when the ring 4 received does not satisfy the predetermined storage condition and a warning sound is emitted (“No” in S22), the operator removes the ring 4 received (S23), Inspection process S2 is completed (End).

(Division process S24)
In the sorting step S24, when it is determined that the storage condition is satisfied in the storage condition conformity determination step S22 (in the case of “Yes” in S22), the data of the circumference value and the plate thickness value of the ring 4 recorded in the database 15 And the ring device 4 in which the control device 14 is received determines which ring group / class it belongs to.

(Receiving process S25)
In the warehousing step S25, the received ring 4 is caused to enter the storage 12 while corresponding to the ring group determined in the sorting step S24.
In the present embodiment, the control device controls the ring 4 placed on the measuring device 11 so that the ring 4 is conveyed by a conveyor and stored in the storage 12.
In addition, when the storage device 12 is received, the control device attaches a storage number to the received ring 4, and size data (circumference value, plate thickness value) and classification data (N (layer), n (class)) and warehousing date data (year / month / day) are stored in the database in association with each other, and the inspection process S2 is completed by the end of the warehousing process S25 (End).

  Moreover, when inspection process S2 is complete | finished with respect to each of the several ring 4 received, the following update process S3 is performed.

(Update process S3)
The update step S3 is a step of updating the target frequency of each class constituting the target frequency distribution. As shown in FIG. 7, the arrival frequency distribution calculating step S31, the average arrival frequency calculating step S32, and the target frequency changing step. S33.

(Receiving frequency distribution calculation step S31)
The arrival frequency distribution calculation step S31 is based on the classification data (N (layer), n (class)) of the received rings 4, and the number of rings 4 received in each class of each ring group (hereinafter referred to as "incoming frequency"). ").
As a result, as shown in Table 1 below, information on the arrival frequency distribution of each ring group is acquired. Then, from the arrival frequency distribution, for example, since the arrival frequency of a relatively small class is large, the tendency that a large number of rings 4 having a circumference value smaller than the design value are received is grasped. It is possible to make a prediction that a ring 4 having a smaller than the design value will be received in the future.

(Average arrival frequency calculation step S32 and target frequency change step S33)
In the average arrival frequency calculation step S32, the average value of the arrival frequencies for the same class (hereinafter referred to as “average arrival frequency” for all ring groups). In Table 1, the range surrounded by the thick line Reference) is calculated. In addition, according to the example of this embodiment, regarding the calculated average arrival frequency, the largest value is the fourth class, and the average arrival frequency decreases as the class moves away from the fourth class.

The target frequency changing step S33 is a step of changing the value of the target frequency set for each class of each ring group to the value of the average arrival frequency.
Further, in the present embodiment, the control device 14 changes the target frequency value of each class of each ring group stored in the database 15 to the value of the average arrival frequency, thereby the target frequency of each class of each ring group. Corresponds to the tendency of the ring 4 that has been received, and the update step S3 ends (End).
As a result, as shown in FIG. 8, the target frequency distribution of the ring group for the first layer before the update had the highest target frequency of the sixth and seventh classes, but in the target frequency distribution after the update, The target frequency of the 4th class is the largest.
And, in the target frequency distribution before the update of the ring group for the first layer, the class with the surplus frequency 5 and the largest surplus frequency was the fourth class (see FIG. 3), but the updated target frequency distribution Therefore, the surplus frequency of the fourth class becomes 0 (see FIG. 8), and the class in which the ring 4 is regarded as surplus is changed.
Further, in the target frequency changing step S33, since the average arrival frequency of the ring 4 received for the target frequency of each ring group is changed, as shown in FIG. 9, the target of the ring group for each layer is changed. The frequency is unified for each class.

Here, in the target frequency changing step S33, the target of the value used for updating is calculated not in the arrival frequency of each ring group calculated in the arrival frequency distribution calculating step S31 but in the average arrival frequency calculating step S32. The reason for the average arrival frequency will be described with an example.
For example, the class with the most rings received in the ring group other than the second layer is the fourth class, and the class with the most rings 4 received in the second layer ring group is the ninth class. Suppose that the highest class is different for each ring group.
When the arrival frequency in the case of the above example is set to the target frequency as it is, the target frequency of each ring group other than for the second layer becomes large near the fourth class as shown in FIG. The target frequency increases near the ninth class.
As a result, in each ring group other than for the second layer, many rings belonging to the vicinity of the fourth class are stored as inventory, and in the second layer, many rings belonging to the vicinity of the ninth class are stored as inventory.
And when selecting a ring and extracting a ring set, many rings belonging to the vicinity of the fourth class in the ring group other than the second layer and many stocks in each ring group for the second layer are stored as stock. Since many of the rings of the ninth class are greatly different in class, there is a possibility that predetermined standard requirements may not be satisfied.
For this reason, even if a ring set is extracted from each ring group by selecting a ring that belongs to the vicinity of the fourth class, the number of rings in the second layer near the fourth class is small, so the number of extracted ring sets is small. Become.
From the above, in this embodiment, in order to suppress the decrease in the number of ring sets while reflecting the tendency of the received rings 4, each layer is calculated using the average arrival frequency calculated in the average arrival frequency calculation step S32 as the target frequency. The target frequency set in is unified (see FIG. 9).

  Next, the laminated ring manufacturing step S5, which is a step after the storage step S1, will be described.

(Laminated ring manufacturing process S5)
As shown in FIG. 11, the laminated ring manufacturing process S <b> 5 starts upon receiving a manufacturing instruction for the laminated ring 3 (Start), and a ring set that satisfies a predetermined standard requirement from a plurality of rings 4 stored in the storage 12. A pairing set extraction step S6 for extracting a plurality of the above, a priority payout limitation step S7 for further limiting the plurality of extracted pairing sets, and one pairing set from among the plurality of limited pairing sets. A ring set determining step 8; and a stacking step S9 for stacking the rings included in the determined pairing set.

(Pairing set extraction step S6)
As shown in FIG. 12, the pairing set extraction step S6 is a step of extracting a pairing set that satisfies a predetermined standard requirement by combining with a plurality of rings 4, and includes a ring selection step S61 and a total clearance requirement determination. Step S62 and an inter-pairing circumferential length difference requirement selecting step S63.
Here, the predetermined standard requirements are a clearance requirement, a total clearance requirement, and a circumference difference requirement between the pairing sets.
The clearance requirement is that the difference in radius between adjacent rings 4 in each layer constituting the laminated ring 3 is within a predetermined value.
The total clearance requirement is that the sum total of the clearances between the rings 4 for all layers is within a predetermined value.
The circumferential length difference requirement between the pairings means that the circumferential length value on the inner circumferential side of one laminated ring 3a and the other laminated ring 3b is within a predetermined value, in other words, one of the ones constituting the pairing set. The circumference value of the ring for the first layer of the ring set and the circumference value of the ring for the first layer of the other ring set are within a predetermined value.

(Ring selection process S61)
The ring selection step S61 is a step for extracting a ring set that satisfies the clearance requirement by selecting the ring 4 from each ring group. Specifically, the ring selection step S61 is performed by the following steps.
First, one ring 4 belonging to the innermost ring group or the outermost ring group is set as a selection starting point. In the present embodiment, description will be made assuming that a ring belonging to the ring group for the innermost layer (first layer) is set as a selection starting point.
It is determined whether or not the clearance requirement is satisfied for all the rings 4 in the ring group for the second layer adjacent to the ring 4 for the innermost layer (first layer). The ring 4 for the second layer, which is a target for determining whether or not the clearance requirement is satisfied, is not limited to the ring 4 of the same class as the ring 4 of the first layer. carry out.
Next, it is determined whether or not the clearance requirement is satisfied for all the rings 4 of the adjacent ring group for the third layer with reference to the plurality of rings 4 for the second layer that satisfy the clearance requirement.
In this way, by sequentially searching for the ring 4 satisfying the clearance requirement from the ring groups adjacent to the outside on the basis of the inner ring 4 satisfying the clearance requirement, the clearance requirement for one ring 4 is determined. Multiple ring sets can be extracted.
The ring selection step S61 is performed for all the rings 4 belonging to the innermost ring group or all the rings 4 belonging to the outermost ring group.
When the ring belonging to the ring group for the outermost layer is selected as the starting point, the clearance requirement is satisfied by the ring 4 of the ring group adjacent to the inner side with reference to the ring 4 of the outer ring group that satisfies the clearance requirement. The ring set is extracted by searching for things in order.

(Total Clearance Requirement Determination Step S62, Pairing Perimeter Difference Requirement Selection Step S63)
The total clearance requirement determining step S62 determines whether or not the sum total of all clearances between the plurality of rings 4 is within a predetermined value for each ring set extracted in the ring selecting step S61. Only the ones that meet are extracted.
Further, in the pairing circumference difference requirement selecting step S63, a combination satisfying the circumference difference requirement among a plurality of ring sets satisfying the requirements of the total clearance requirement determining step S62 is selected, and a plurality of pairing sets are extracted. .
As described above, the pairing set extraction step S6 is completed, and a plurality of pairing sets satisfying predetermined standard requirements are extracted.

(Priority payout limitation process S7)
The priority payout limiting step S7 is a step for limiting the ring set including the ring 4 to be preferentially paid out from the plurality of pairing sets extracted in the pairing set extraction step S6.
As shown in FIG. 13, the priority payout limiting step S7 includes a payout index setting step S71, a first priority ring group / class specifying step S72, a second priority ring group / class specifying step S73, and a limiting step S74. have.

(Dispensing index setting step S71)
The payout index setting step S71 is a step of calculating a surplus frequency for each class of each ring group and setting the calculated surplus frequency as a payout index for that class.
Further, the surplus frequency is the inventory number of the ring 4 that exceeds the target frequency as described above. For example, when the inventory frequency greatly exceeds the target frequency, the surplus frequency increases and the payout index increases. .
Specifically, in the payout index setting step S71 of the present embodiment, the control device 14 performs the following processing based on the data stored in the database 15.
First, based on the classification data [N (layer), n (class)] of the ring 4 stored in the database 15, the inventory frequency in stock in each class of each ring group is calculated.
Next, the target frequency is subtracted from the inventory frequency to calculate the surplus frequency of each class of each ring group.
Table 2 below shows the surplus frequency for each class in each ring group. In addition, the case where the number of surplus inventory rings is “0” is the case where the number of rings in stock in the class is equal to or less than the target frequency.

(First priority ring group / first priority class specifying step S72)
The first priority ring group / first priority class specifying step S72 specifies the layer to which the ring 4 set as the selection starting point in the ring selection step S61 belongs to the first priority ring group, and further calculates the surplus frequency distribution table calculated in the previous step Based on the above, the class having the largest payout index in the first priority ring group is specified as the first priority class.
Regarding the identification of the first priority ring group, in the present embodiment, since the ring 4 belonging to the innermost layer (first layer) ring group is selected as the selection starting point, the ring group for the first layer becomes the first priority ring group. Identified. If the ring group to which the ring 4 serving as the selection starting point belongs in the ring selection step S61 is the outermost layer (Nth layer), the ring group for the Nth layer is specified as the first priority ring group.
Regarding the identification of the first priority class, in this embodiment, as shown in Table 2, the payout index of each of the sixth, seventh, ninth, and tenth classes belonging to the first priority ring group is 3, and the payout index is the highest. There are several large classes. Thus, when there are a plurality of candidates for the first priority class, they are specified by the next search step S77.

(Search step S77)
As shown in FIG. 14, in the search step S77, first, the reference class of the target frequency distribution of the ring group for the first layer and the comparison class of the inventory frequency distribution are determined (S771).
Here, the reference class of the target frequency distribution indicates a class having the highest target frequency in the ring group for the first layer, and in the present embodiment, the fourth class is the reference class (see FIG. 8).
On the other hand, the comparative class of the inventory frequency distribution indicates a class having the highest inventory frequency in the ring group for the first layer.
In addition, when there are a plurality of classes having the highest target frequency, or when there are a plurality of classes having the highest inventory frequency, the value of the class (for example, “6” for the sixth class and “7” for the seventh class) The average value (“6.5”) is the reference class or the comparison class.
As shown in FIG. 8, in the present embodiment, there are a plurality of classes having the highest inventory frequency in the sixth class and the seventh class. Therefore, the average value of the 6.5th class is the comparative class.

Next, it is determined whether the comparison class of the inventory frequency distribution is larger than the reference class of the target frequency distribution (S772).
When the comparison class of the inventory frequency distribution is larger than the reference class of the target frequency distribution (in the case of “Yes” in S772), the search direction is determined from the 12th class having the higher class to the first class (S773). .
On the other hand, when the comparison class of the inventory frequency distribution is smaller than the reference class of the target frequency distribution (in the case of “No” in S772), the search direction is determined from the first class having the smaller class to the twelfth class. (S774).
Then, the search is performed in the determined search direction, and the first searched out of the plurality of candidates of the first priority class is set as the first priority class (S775), and the search step S77 is ended (End).

In the present embodiment, since the 6.5th class that is the comparison class of the inventory frequency distribution is larger than the fourth class that is the reference class of the target frequency distribution (in the case of “Yes” in S772), the search direction is the class. The direction is from the large 12th class to the 1st class (see arrow A shown in FIG. 8).
As a result, among the plurality of candidates for the first priority class, the tenth class is searched first, and the tenth class is set as the first priority class.
If the comparison class of the inventory frequency distribution is smaller than the reference class of the target frequency distribution (in the case of “No” in S772), the search direction is the direction from the first class to the twelfth class (illustrated in FIG. 8). (See arrow B). As a result, among the plurality of candidates for the first priority class, the sixth class is searched first, and the sixth class is set as the first priority class.

According to the search step S77 described above, the first priority class is selected from the class side where there are many in-stock rings 4 on the basis of the standard class of the target frequency distribution. For this reason, it is canceled that the ring 4 is biased toward the large class side or the small class side with respect to the standard class of the target frequency distribution.
Further, the class that starts the search direction is the 12th class or the first class, and a class that is far from the average value of the target frequencies is set as the first priority class.

(Second priority ring group / second priority class specifying step S73)
The second priority ring group / second priority class specifying step S73 is a step for specifying a ring group having a large surplus inventory ring frequency in a ring group other than the first priority ring group, and a second priority ring group specifying step And a second priority class specifying step.

(Second priority ring group identification process)
In the second priority ring group identification step, the ring groups other than the first priority ring group are added to the payout indexes set for each class, and the ring group having the largest sum of the payout indexes is set as the second priority ring group. To do.

(Second priority class identification process)
The second priority class specifying step is a step of setting the class having the largest payout index in the second priority ring group as the second priority class, and the second priority ring group / class specifying step S73 ends.
In the second priority ring group, when there are a plurality of classes having the largest sum of the payout indexes, the second priority class is determined by the search step S77 described above.

(Limiting step S74)
The limiting step S74 is a step for narrowing down (limiting) a pairing set that satisfies the standard requirements to a pairing set that is preferentially paid out.
In the limiting step S74, first, the ring 4 belonging to the first priority class identified in the first priority ring group / class identification step S72 is selected from the plurality of pairing sets extracted in the pairing set extraction step S6. Limit to what you include.
Here, since each of the pair of ring sets constituting the pairing set includes the ring 4 for the first layer, each of the pair of ring sets needs to include the ring 4 belonging to the first priority class. is there.

Next, in the limiting step S74, the pairing set including the ring 4 belonging to the first priority class is limited to the pairing set including the ring 4 belonging to the second priority class, and the priority payout limiting step. S7 ends.
Here, for example, when the first priority class is the first class and the second priority class is the twelfth class, the second priority class is included in the pairing set including the ring 4 belonging to the first priority class. The ring 4 to which it belongs may not be included.
In such a case, the pairing set including the ring 4 belonging to the first priority class is set as a pairing set to be preferentially paid out, and is not limited to the ring 4 belonging to the second priority class. Step S7 is completed.

According to the above priority payout limiting step S7, the pairing set satisfying the standard requirements is limited to only the pairing set including the ring 4 belonging to the first priority class of the first priority ring group.
Therefore, the ring 4 selected as the pairing set and paid out from the storage is limited to the ring 4 that is surplus in the innermost layer or the outermost ring group.
As a result, in the ring group for the innermost layer or the outermost layer, there is no possibility that the ring 4 is selected from a class whose inventory frequency is lower than the target frequency, and the number of pairing sets can be reduced.

(Ring set determination step S8)
The ring set determining step is a step for determining one pairing set from the plurality of pairing sets limited by the priority payout limiting step S7. As shown in FIG. 15, the priority index calculating step S81. And a priority index comparison step S82.

(Priority index calculation step S81)
In the priority index calculation step S81, the priority index of each of the plurality of pairing sets limited by the priority payout limitation step S7 is obtained.
Here, the priority index is the sum of the payout indices set for the class to which the ring 4 for each layer constituting the pairing set belongs.
Therefore, as shown in Table 3 below, the pairing set is a ring set No. 1 and ring set no. 4 in combination with the ring set no. 26, which is the sum of the payout indexes of 1, and the ring set No. 48, which is the sum of the payout index of 4, and 22 is the priority index.

Next, the priority index comparison step S82 selects one pairing set having the highest priority index from among the plurality of pairing sets.
According to this, the ring 4 belonging to a class having a large payout index can be easily selected, and the ring 4 stored in the storage can be brought close to the target frequency.
And by selecting one pairing set, the ring 4 used for manufacture of the lamination | stacking ring 3 is determined, and ring set determination process S8 is complete | finished.

(Lamination process S9)
In the stacking step S9, the ring 4 of each layer constituting the pairing set selected in the ring set determining step S8 is conveyed from the storage 12 to the stacking device 13 by a conveyor, and the ring 4 is overlapped by the stacking device 13 to stack the rings. 3 is manufactured, and all the steps of the laminated ring manufacturing step S5 are completed.

According to the manufacturing method of the laminated ring 3 according to the embodiment described above, the innermost layer or outermost layer ring constituting the pairing set determined for the laminated ring 3 is surplus exceeding the target frequency. It is a class ring.
For this reason, the situation in which the ring 4 of the class whose inventory quantity is insufficient in the ring group for the innermost layer or the outermost layer is avoided, and the number of ring sets that can be extracted in the ring selection process Can be suppressed, and the continuation of the production of the laminated ring can be stabilized.

The manufacturing method of the laminated ring 3 according to the embodiment has been described above, but the present invention is not limited to the example described in the embodiment.
In the priority payout limiting step S7 according to the embodiment, the second priority ring group / class specifying step S73 specifies the second priority class, and the ring set specifying step S74 includes the ring 4 belonging to the second priority class. Although configured to be limited to the ring set, the present invention is not limited to this.
For example, after specifying the second priority class in the second priority ring group / class specifying step S73, the payout index of the second priority class may be doubled to weight the payout index, for example.
According to this, it is reflected in the priority index of the pairing set calculated in the priority index calculation step S81, and can be selected from the pairing set having the highest priority index in the priority index comparison step S82 and paid out from the storage. This is because the sex becomes higher.
When weighting the payout index, the ring set specifying step S74 may not be limited to the pairing set including the ring 4 belonging to the second priority class.

In the embodiment, the ring set determining step S8 is performed after the priority payout limiting step S7. However, as a modification, the storage period limiting step is performed after the priority payout limiting step S7 and before the ring set determining step S8. May be.
This storage period limited process includes the ring 4 in which the period during which the ring 4 is stored in the storage 12 is equal to or longer than the predetermined storage period among the plurality of pairing sets limited by the priority payout limiting process S7. It is the process of limiting to what is.
According to this process, since the storage period is limited to the ring set including the ring 4 having a predetermined period or more, it is possible to reduce the number of rings 4 that are discarded after the predetermined storage period.

In the search step S77 of the embodiment, the search is performed for all classes belonging to the first priority ring group, but the present invention is not limited to this. For example, the search range (class) by the search step S77 may be limited, and the first priority class may be specified from the limited range.
Here, as a method for limiting the search range, the average circumference μ and the average standard deviation σ in the target frequency distribution are calculated by a search range limitation process described later, and the first priority class is the average circumference μ ± average standard of the ring. It can be specified from a class outside the range of the deviation 3σ.

To explain in detail, the search range limiting step is performed by first calculating the average of the circumference values of the rings 4 divided for each ring group based on the circumference values of the received rings that are the basis for creating the target frequency distribution. And the average circumference μ1 for each ring group is obtained. Then, the average circumference μ1 for all the ring groups is added, the total number is divided by the total number of ring groups, and the average circumference μ of all the rings is calculated.
Next, the standard deviation σ1 for each ring group is calculated for each ring group based on the average circumference μ1 for each ring group.
The standard deviation σ1 is derived for each ring by obtaining a deviation which is a difference between the ring circumference and the average circumference μ1 of each ring group to which the ring 4 belongs. For each ring group, the standard deviation σ1 can be derived by adding the squares of the deviations and calculating the square root of the sum.
Then, the standard deviations σ1 for all the ring groups are added together, and the total number is divided by the total number of ring groups to calculate the average standard deviation σ of the entire ring group.

According to this, as shown in FIG. 16, the search range of the search step S77 is a class (first class) smaller than the class (second class in FIG. 16) to which the value of average circumference μ−average standard deviation 3σ belongs. ) And a class (tenth class to twelfth class) larger than the class (the ninth class in FIG. 16) to which the value of average circumference μ + average standard deviation 3σ belongs.
When the direction of search is determined from the 12th class having the higher class to the 1st class (in the case of “Yes” in S772), the 12th class to the 10th class are searched (see arrow A1 in FIG. 16). Next, the first class is searched (see arrow A2 in FIG. 16), and the first searched out of the plurality of candidates of the first priority class is specified as the first priority class (S775). .

  Further, in the search range limiting step described above, when there is no first priority class candidate outside the range of the average circumference μ ± average standard deviation 3σ of the ring, the first priority class cannot be specified. Therefore, in the search range limiting step, if the first priority class cannot be specified by searching outside the range of the average circumference μ ± average standard deviation 3σ of the ring, it is outside the range of the average circumference μ ± average standard deviation 2σ. The search range may be gradually expanded outside the range of the average circumference μ ± average standard deviation σ.

Specifically, as shown in FIG. 16, after searching outside the range of the average circumference μ ± average standard deviation 3σ of the ring (see arrows A1 and A2), it is outside the range of average circumference μ ± average standard deviation 2σ. The 12th class to the 9th class and the 2nd class to the 1st class are searched in order from the largest class (see arrows B1 and B2).
Then, when a plurality of candidates of the first priority class are not outside the range of the average circumference μ ± average standard deviation 2σ, the 12th to 7th classes that are outside the range of the average circumference μ ± average standard deviation σ The third class to the first class are searched in order from the largest class (see arrows C1 and C2).
As described above, according to the search range limiting step, the probability that a class far apart from the class to which the average circumference μ1 belongs is specified as the first priority class is increased, and the ring 4 belonging to the class far away from the class is actively added. It becomes possible to pay out.
In addition, although the search range limitation process has been described with an example in which the first priority class is specified using the search process S77, the present invention is not limited to this, and the second priority class is specified by the search process S77. Even in this case, the search range limiting step may be applied.

DESCRIPTION OF SYMBOLS 1 Belt 2 Element 3 (3a, 3b) Laminated ring 4 Ring 10 Laminated ring manufacturing system 11 Measuring apparatus 12 Storage 13 Laminated apparatus 14 Control apparatus 15 Database

Claims (6)

A method for producing a laminated ring in which a received ring is divided and stored in a ring group for each layer based on a circumference value, and a ring is produced by selecting a ring from the ring group for each layer,
A ring selection step of extracting a plurality of ring sets by selecting a ring that satisfies the clearance requirement from the ring group adjacent to the ring group that is divided into the ring group for the innermost layer or the ring group for the outermost layer in order.
The innermost ring group or the outermost ring group to which the ring that is the starting point of selection belongs is specified as a first priority ring group, and the first priority is determined based on the target frequency distribution and the inventory frequency distribution. A surplus frequency that is a surplus number of rings in each class of the ring group is calculated, the largest class is specified as the first priority class, and the rings that belong to the first priority class are determined as the plurality of ring sets. Priority payout limitation process limited to what is included,
For each ring set limited by the priority payout limiting step, based on the target frequency distribution and the inventory frequency distribution, the sum is calculated by adding the surplus frequencies of the classes to which the rings constituting the ring set belong. A ring set determining step for determining that the laminated ring is manufactured with a ring set having the largest sum of the surplus frequencies,
A laminating step for producing a laminated ring by laminating a plurality of rings constituting the ring set determined in the ring set determining step;
A method for producing a laminated ring, comprising: The priority payout limitation process includes:
Further, based on the target frequency distribution and the inventory frequency distribution, the sum of the surplus frequencies is calculated for every ring group except the first priority ring group, and the ring group having the largest sum of the surplus frequencies is calculated. Specifying a second priority ring group, and specifying a class having the largest surplus frequency in the second priority ring group as a second priority class,
The plurality of ring sets extracted in the ring selection step are limited to those including both a ring belonging to the first priority class and a ring belonging to the second priority class. Item 2. A method for manufacturing a laminated ring according to Item 1. In the priority payout limitation step, when the first priority class is specified or the second priority class is specified, and there are a plurality of candidates for the first priority class or candidates for the second priority class, the first searched for priority class is determined. A search step for setting the first priority class or the second priority class,
The searching step includes
It is determined whether or not the reference class that has the highest target frequency in the ring group has a large comparison class that is the class that has the highest inventory frequency in the ring group,
When the comparison class is larger than the reference class, the first priority class candidate or the second priority class candidate is searched from the large class toward the small class,
The first priority class candidate or the second priority class candidate is searched for from the smaller class toward the larger class when the comparison class is smaller than the reference class. The manufacturing method of the lamination | stacking ring of Claim 2. Before the ring selection step, the storage ring has a storage step of storing the received rings by dividing them into ring groups for each layer based on the circumference value,
The storage step includes
A measurement step of measuring the received ring to obtain a circumference value of the ring;
Based on the perimeter value of the ring, the incoming ring is divided into ring groups for each layer, and a dividing step of dividing the ring group into each class;
An arrival frequency distribution calculating step for calculating an arrival frequency distribution indicating the arrival frequency that is the number of received rings for each class of each ring group;
An average arrival frequency calculation step of calculating an average value of the arrival frequency in the same class of all ring groups and calculating an average arrival frequency of each class;
A target frequency changing step of changing the value of the target frequency set for each class of each ring group to the average arrival frequency by the target frequency distribution;
The method for manufacturing a laminated ring according to any one of claims 1 to 3, wherein: In the storage step, after the measurement step,
A storage condition conformity determination step for determining whether or not the predetermined storage condition is satisfied based on the circumference value of the ring;
When it is determined that the predetermined storage condition is not met, an excluding step of excluding the received ring without storing in the storage;
When it is determined that the predetermined storage condition is met, the received rings are divided into ring groups for each layer based on the circumference value of the ring, and each class of the ring group The sorting step to sort; and
Have
The predetermined storage condition has a possibility that a received ring satisfies the predetermined standard requirement and is selected as a ring set.
The manufacturing method of the lamination | stacking ring of Claim 4 characterized by these. After the priority payout limitation process and before the ring set determination process,
A storage period limiting step for limiting the storage period of the ring to those containing a ring having a predetermined storage period or more.
The manufacturing method of the lamination | stacking ring of any one of Claim 1 thru | or 5 characterized by these.

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