JP4138624B2 - Shipment management method for belt element for continuously variable transmission - Google Patents

Description

  The present invention relates to an element shipping management method executed when shipping an element of a continuously variable transmission belt from a storage location to a belt assembling process.

  Referring to FIG. 1A, an element 1 of a continuously variable transmission belt includes a body portion 2 that contacts a pulley of the continuously variable transmission, and a head that is connected to the body portion 2 via a neck portion 3. Part 4. And many elements 1 are laminated | stacked cyclically | annularly, an endless ring (not shown) is fitted to the groove portions 5 and 5 on both sides of the neck portion 3 formed between the body portion 2 and the head portion 4, respectively. A belt for a continuously variable transmission is assembled by binding the elements 1 together. In addition, as shown in FIG. 1B, the thickness of one side of the body portion 2 of the element 1 is increased toward the inner periphery of the belt in order to allow the circular motion of the element 1 in the pulley of the continuously variable transmission. An inclined portion 6 is formed so as to decrease, and a single-side projection 7 and a concave hole 8 on the opposite surface are formed in the head portion 4 by half punching, and the projection 7 is a recess in the head portion of an adjacent element. The elements are aligned with each other by fitting in the holes.

  The element 1 is stamped and formed from a coil material using a punching press device (see, for example, Patent Document 1). In this case, a difference in the plate thickness between the head portion 4 and the body portion 2 of the element 1 or a difference in plate thickness between both sides in the width direction of the body portion 2 may be caused due to the pulling of the material at the time of punching. When a plurality of punching parts are provided in the press device and a plurality of elements are punched by a single press operation, the dimensional accuracy of the element 1 for each punching part, that is, the head part 4 and the body part 2 The plate thickness difference and the plate thickness difference on both sides in the width direction of the body part 2 slightly change. In addition, even in the case of elements punched at the same punched portion, the dimensional accuracy of the element changes with time due to replacement of the coil material, punch of the punched portion, replacement of the die, or the like.

  Here, in a press apparatus having a plurality of punched portions, a plurality of receiving boxes for receiving the punched elements are provided corresponding to the plurality of punched portions, and a predetermined number (for example, 6,000) of elements are accumulated in each receiving box. By the way, the receiving box is replaced with a new one. In this case, the elements accommodated in the individual receiving boxes can be handled as an element group having substantially the same dimensional accuracy. Therefore, the dimensional accuracy of the element is measured by sampling inspection for each receiving box, and the measurement data is received and stored in the management device as the dimensional accuracy of the element group in the receiving box.

  By the way, in a continuously variable transmission belt, the clearance between elements affects the performance (slip rate, etc.) of the belt, and thus the clearance needs to be properly managed. Here, when the required number (for example, 400) of elements in the same receiving box is extracted and the belt is assembled, the dimensional accuracy of these elements is almost the same, so the deviation of the dimensional accuracy of each element from the tolerance center. In many cases, a belt with good clearance cannot be obtained. For example, when the plate thickness on one side in the width direction of the body portion 4 of the element 1 in the receiving box is thinner than the plate thickness on the other side, the clearance on one side in the width direction of the belt becomes excessive. In this case, if the belt is assembled by mixing elements in which the thickness of the body portion 4 on one side in the width direction is thicker than the thickness on the other side, a belt having a uniform clearance on both sides in the width direction can be obtained.

Therefore, when shipping the storage bins in storage to the belt assembly process, it is based on the dimensional accuracy of the elements in each bin so that the average dimensional accuracy of the elements is as close as possible to the center of the tolerance range. It is desirable to select an appropriate combination of receiving boxes (element groups) to be shipped. In this case, if a search for a combination is performed in a full search for a large number of receiving boxes in storage, the amount of calculation becomes enormous. For example, if the number of receiving boxes in storage is 180 and the number of receiving boxes to be shipped is 16, the number of combinations is 180C16≈2.92 × 10 ²² , and one combination is calculated. Even if the time is 1 μs, the total calculation time is about 8.11 × 10 ¹² hours, and it is impossible to perform such calculation. Therefore, the present situation is that a predetermined number of boxes (element groups) corresponding to a plurality of punched portions are shipped in combination so as to be evenly mixed. It should be noted that publicly known literature relating to such element shipping management methods has not been found at this stage.
JP 2001-246428 A

  In view of the above points, the present invention provides a combination of a predetermined number of element groups to be shipped to the belt assembling process so that the average dimensional accuracy of the elements is as close as possible to the center of the tolerance range. It is an object of the present invention to provide a shipping management method for a continuously variable transmission belt element that enables easy selection and good belt assembly.

  The present invention relates to a belt-like component for a continuously variable transmission, which is a plate-like member having a body portion on the belt inner periphery side and a head portion on the belt outer periphery side connected to the body portion via a neck portion. An element shipping management method, in which a group of elements having substantially the same dimensional accuracy is taken as one element group, and a predetermined number of element groups are selected from a plurality of stored element groups and shipped to a belt assembling process. Regarding improvement, in order to solve the above-described problem, a grouping step of grouping a plurality of element groups into groups every two so that the average dimensional accuracy of each group of elements satisfies a predetermined condition, Each group of elements grouped in the grouping process is regarded as one element group in the next grouping process, and the number of element group groups is equal to or less than a predetermined set number. After going down As a group shipped from the element group grouped in the grouping process to the belt assembly process, the number of elements obtained by subtracting the predetermined number from the number of element groups belonging to one group is an average of the elements of these groups. The selection process is performed in which the dimensional accuracy is selected in such a combination as close as possible to the center of the tolerance range.

  To select a combination of elements to be shipped to the belt assembly process, the average dimensional accuracy of the elements is as close as possible to the center of tolerance, and calculate the average dimensional accuracy for all possible combinations. There is a need. However, if there are many constituents of the population to be selected, the total number of combinations becomes excessive. Therefore, in the present invention, by performing the grouping step, the number of constituents of the population (number of sets) to be selected in the selection step is reduced to a setting number or less so that the total number of combinations is not excessive. Yes. Specifically, when the number of element groups being stored is, for example, 180, the group of elements being stored is grouped into 90 groups addressed to two in the first grouping process, and the second grouping process. It is divided into 45 sets addressed to four. When the set number is “50”, the selection process is executed after the second grouping process. Since the number of element groups belonging to one group grouped in the second grouping process is four, if the number of element groups shipped to the belt assembly process (predetermined number) is 16, for example. In the selection step, a combination of four sets is selected from the 45 sets. Here, there are 180C2 = 16110 ways of grouping in the first grouping process, 90C2 = 4005 ways of grouping in the second grouping process, and 45C4 in the selection process. = 1488995 ways. These totals are 169110, and the number is much smaller than when a combination of 16 element groups is directly selected from 180 element groups. In the grouping process and the selection process, the average dimensional accuracy of the elements is obtained for each grouping (combination), and it is determined whether or not this satisfies a required condition. If the computation time for that is 1 μs, for example, the total computation time is 169 ms, and a combination of element groups to be shipped in a short time can be selected.

  By the way, in the grouping process, it is possible to perform grouping so that the total sum of all sets of deviations with respect to the center of tolerance of the average dimensional accuracy of each group of elements becomes the smallest. The average dimensional accuracy of a set including an inaccurate element group (an element group having a large dimensional accuracy deviation with respect to the center of tolerance) is not necessarily improved. Therefore, there is a high possibility that an element group with poor dimensional accuracy will be stored for a long period of time without being shipped, which is a problem in improving the yield.

  In order to solve this problem, based on the dimensional accuracy of each element group, a priority is assigned to a plurality of element groups such that the lower the dimensional accuracy is, the higher the priority is. The extraction process for extracting the element group with the highest priority among the non-element groups, and the element group that has the same set as the extracted element group, the average dimensional accuracy of the element is the center of the tolerance range. It is desirable to repeat the selection process of selecting the element group closest to the element group from elements that have not yet been assembled. According to this, an element group with poor dimensional accuracy is extracted at an early stage, and an element group that forms a set can be selected from a larger number of element groups. Therefore, even for an element group with poor dimensional accuracy, the average dimensional accuracy of a set including the element group approaches the tolerance center, and the possibility that this set is selected and shipped in the selection process increases.

In addition, if there are multiple items including the thickness difference between the body part and the head part of the element and the thickness difference between both sides in the width direction of the body part as management items related to dimensional accuracy, the center of tolerance of each of these management items It is desirable to calculate the Euclidean distance based on the deviation with respect to the value, and to increase the priority as the Euclidean distance increases. The Euclidean distance (d) is defined as a value that becomes d ² = p1 ² + p2 ² +... + Pn ^{2 based} on p1 to pn. Here, even if the sum of the deviation with respect to the median tolerance of the plate thickness difference between the body part and the head part and the deviation with respect to the median tolerance of the plate thickness difference on both sides in the width direction of the body part are the same, both deviations are almost the same. An element group in which only one deviation is larger than an equal element group makes it difficult to find a group of elements. Here, the Euclidean distance becomes larger when only one deviation is large. Therefore, by increasing the priority according to the Euclidean distance, an element group having only one deviation is extracted at an early stage, and the possibility that this element group is shipped increases.

  In addition, an element group that has been left for a long time without being shipped after production may cause a problem in quality. In this case, the priority is determined by taking into account the dimensional accuracy of the element and the elapsed time from the manufacture, so that even if the dimensional accuracy of the element is the same, the priority is higher for the element group having a longer elapsed time from the manufacture. By doing so, it becomes possible to preferentially ship the element group having a long elapsed time since manufacture, and it is possible to avoid leaving the element group for a long time without being shipped.

  In the second and subsequent grouping steps, the priority of the highest element group among the element groups belonging to each group of element groups grouped in the previous grouping step is set as a priority representing the group. It is desirable to extract a group of element groups in the extraction step. This increases the possibility that an element group with poor dimensional accuracy or an element group with a long elapsed time from manufacture will be shipped.

  In addition, when a plurality of combinations of element groups are selected in the selection process, the combination group having the highest sum of the priority levels of the element groups belonging to each combination group is preferentially shipped to the belt assembly process. For example, there is a higher possibility that an element group with poor dimensional accuracy or an element group with a long elapsed time from manufacture will be shipped.

  Further, among the element groups belonging to the combination set having the highest sum of the priority levels of the element groups, the element group whose priority is lower than the priority of other element groups not belonging to the combination set is determined as the average size of the elements. As long as the condition that the accuracy is within the tolerance range is satisfied, an adjustment process that replaces the other element group is performed, and after the adjustment process, it is shipped to the belt assembly process. Long elements can be shipped with priority as much as possible. If the element group is replaced in the adjustment step, the average dimensional accuracy of the element group of other combinations other than the combination to be shipped deteriorates. Therefore, after the adjustment process, the grouping process and the selection process are performed again on the unshipped element group, and the element group to be shipped next is selected.

  Hereinafter, an embodiment in which the present invention is applied to a shipping management method of the element 1 of the continuously variable transmission belt shown in FIG. 1A, which is stamped and formed by a press device (not shown) having a plurality of punched portions will be described. To do.

  As described above, in a press apparatus having a plurality of punched portions, a plurality of receiving boxes for receiving the punched elements 1 are provided corresponding to the plurality of punched portions, and a predetermined number (for example, 6,000) is provided in each receiving box. When the element 1 is accumulated, the receiving box is replaced with a new one. In this case, the dimensional accuracy of the elements 1 housed in the individual receiving boxes is almost the same. Therefore, in this embodiment, one receiving box is handled as one element group that is a group of elements 1 having substantially the same dimensional accuracy. It is also possible to handle a plurality of receiving boxes for storing the elements 1 punched by the same punching portion as one element group.

  The receiving box carried out from the press device is transported to a measuring process, where the dimensional accuracy of the element 1 in the receiving box is measured by sampling inspection. The measurement data is stored in association with a receiving box in a management device comprising a computer. When measuring the dimensional accuracy, as shown in FIG. 1 (a), both sides a and b of the head portion 4 in the width direction, the base end portion c of the neck portion 3, and both sides of the body portion 4 in the width direction. The total thickness of 5 points d and e is measured, and the difference between the average value of the thicknesses a and b2 and the average value of the thicknesses d and e2 is the thickness of the head 4 and the body 2. The difference Δt1 is obtained, and the difference between the thicknesses d and e2 is obtained as the thickness difference Δt2 on both sides of the body portion 2 in the width direction. After the measurement of the dimensional accuracy, the receiving box is transported to a storage place and placed by a transfer machine at a predetermined place on a storage shelf provided in the storage place. The location where the receiving box is placed is stored in the management device. The number of elements 1 stored in the receiving box may be less than the predetermined number for some reason. Therefore, in the measurement process, in addition to the above-described measurement of dimensional accuracy, the weight of the receiving box is measured, and the number of elements 1 in the receiving box is indirectly measured.

  When there is a shipping request from the belt assembling process, the management device selects a predetermined number, for example, 16 receiving boxes from the receiving boxes being stored. Then, the selected receiving box is taken out by the transfer machine and shipped to the belt assembling process. In the belt assembling process, first, all the elements in the receiving box are put into a mixer for mixing, and the mixed elements are put into a parts feeder to perform belt assembling work. Of course, it is possible to ship the selected receiving box element to the belt assembling process after mixing.

As shown in FIG. 2, the selection operation of the receiving boxes to be shipped is performed in the order of the ranking step (S1), the grouping step (S2, S3), the selection step (S4), and the adjustment step (S5). In the ranking process, based on the dimensional accuracy of the element 1 in the receiving box and the elapsed time from manufacturing, the lower the dimensional accuracy for all receiving boxes in storage and the longer the elapsed time from manufacturing, the higher the priority. Set the order so that the degree is higher. To explain this in detail, the Euclidean distance d based on the deviation from the median tolerance of each control item relating to the dimensional accuracy of the element 1 is calculated, and the value obtained by multiplying the elapsed time T from manufacture by a predetermined coefficient k is Euclidean. An evaluation value H (= d + k · T) is obtained by adding to the distance d, and a ranking is given so that the higher the evaluation value H, the higher the priority. In addition, when the management items regarding the dimensional accuracy of the element 1 are the plate thickness difference Δt1 between the head portion 4 and the body portion 2 and the plate thickness difference Δt2 on both sides in the width direction of the body portion 2, the respective median tolerance is zero. Therefore, the Euclidean distance d is d ² = Δt ^{1 2} + Δt ^{2 2} . When the thickness of the portion c of the neck portion 3 is included in the management item as a representative value of the thickness of the element 1, the Euclidean distance d including the deviation from the median tolerance is calculated.

  FIG. 3 (a) is a diagram visually showing the order of priority assigned to the receiving box, where each square represents the receiving box 10, and the numbers in the boxes are the priority, and the smaller the number, the higher the priority. Is high.

  Next, the receiving boxes 10 being stored in the grouping process are grouped into two groups Gs (see FIG. 3B). In this grouping step, first, the receiving box 10 having the highest priority “1” among the receiving boxes 10 being stored is extracted, and the receiving box 10 becomes the same set Gs as the extracted receiving box 10. 10, the receiving box 10 whose average dimensional accuracy between the elements in the receiving box 10 and the extracted elements in the receiving box 10 is closest to the center of the tolerance range is selected from the remaining receiving boxes 10. The For example, assuming that the thickness difference Δt2 on both sides of the body part 2 in the width direction is given a positive or negative sign depending on which side is thicker, When the plate thickness difference Δt2 is positive, the receiving box 10 in which the element 1 having an absolute value close to the plate thickness difference Δt2 and having a negative sign is selected is selected. In FIG. 3B, the receiving box 10 having the priority “8” is selected as the receiving box 10 having the same set Gs as the receiving box 10 having the priority “1”. In addition, when the number of the elements 1 accommodated in the two receiving boxes 10 and 10 constituting the group Gs is different, the weighted average of the elements 1 in consideration of the number of the elements 1 accommodated in the receiving box 10 is used. Find the average dimensional accuracy.

  Next, the receiving box 10 with the highest priority “2” is extracted from the receiving boxes 10 excluding the receiving box 10 with the priority “1” and the receiving box 10 with the priority “8”. The receiving box 10 that is paired with the box 10 is selected in the same manner as described above. Thus, in the grouping process, the extraction process for extracting the receiving box 10 with the highest priority among the receiving boxes 10 that are not yet in the set Gs, and the same group Gs as the extracted receiving box 10 are obtained. As the receiving box 10, the receiving box 10 whose average dimensional accuracy between the elements in the receiving box 10 and the extracted elements in the receiving box 10 is closest to the center of the tolerance range is not yet in the set Gs. The selection process of selecting from the box 10 is repeated. In FIG. 3B, the receiving box 10 having the same group Gs as the receiving box 10 having the priority “2” is selected with the priority “9” and is the same as the receiving box 10 having the priority “3”. A receiving box 10 having a priority of “5” is selected as a receiving box 10 to be set Gs, and a receiving box 10 having a priority of “10” is selected as a receiving box 10 having the same set Gs as the receiving box 10 having a priority of “4”. A state is shown in which the receiving box 10 having the same group Gs as the receiving box 10 having the priority “6” is selected with the priority “7”. When the total number of receiving boxes 10 being stored is 180, these receiving boxes 10 are grouped into 90 groups Gs in the above-described grouping process.

  In this case, the number of sets Gs is larger than the set number described in detail later, and in this case, the second grouping step is executed. In the second grouping step, the group Gs grouped in the first grouping step is grouped into two groups Gb (see FIG. 3C). In this grouping, first, the highest priority among the receiving boxes 10 belonging to each group Gs grouped in the first grouping step is set as a priority representing the group Gs. Priorities are assigned to the plurality of groups Gs grouped in the process. As shown in FIG. 3, the priority order of the group Gs is from the highest, the group Gs (No 1) of the receiving boxes 10 with the priority “1” “8”, and the receiving boxes 10 with the priority “2” “9”. Set Gs (No 2), set Gs (No 3) of receiving box 10 with priority “3” “5”, set Gs (No 4) of receiving box 10 with priority “4” “10”, priority “6” A set Gs (No. 5) of the receiving box 10 of “7” is obtained.

  First, the group Gs of the receiving box 10 having the highest priority “1” “8” is extracted, and this group Gs becomes the same group Gb as the extracted group Gs. The group Gs whose average dimensional accuracy of the element 1 in the Gs receiving box 10 and the element 1 in the extracted group Gs receiving box 10 is closest to the center of the tolerance range is selected from the remaining groups Gs. Is done. Thereafter, an extraction process for extracting the set Gs having the highest priority among the sets Gs that have not yet been set to Gb, and a set Gs that is the same set Gb as the extracted set Gs, the receiving box of this set Gs The group Gs whose average dimensional accuracy between the element 1 in the element 10 and the element 1 in the receiving box 10 of the extracted group Gs is closest to the center of the tolerance range is selected from the group Gs that are not yet the group Gb. The selection process is repeated and the second grouping is performed. In FIG. 3C, the set Gs of the receiving boxes 10 with the priority “2” and “9” is selected as the set Gs that is the same set Gb as the set Gs of the receiving boxes 10 with the priorities “1” and “8”. The state in which the group Gs of the receiving boxes 10 with the priority “6” and “7” is selected as the group Gs that is the same as the group Gs of the receiving boxes 10 with the priority “3” and “5” is shown. ing. If the number of sets Gs grouped in the first grouping process is 90, the grouping process is divided into 45 groups Gb in the second grouping process, and the receiving boxes 10 belonging to each group Gb. The number will be four.

  Next, among the sets Gb grouped in the second grouping process, the number of shipments (= 4) of the receiving boxes 10 belonging to one group Gb as the group Gb to be shipped to the belt assembly process (= 4) = 16) is selected as a gradual number, that is, 16/4 = 4 sets Gb are selected in such a combination that the average dimensional accuracy of element 1 of these sets Gb is as close as possible to the center of the tolerance range. A selection process is performed. In this selection, the average dimensional accuracy of the element 1 is calculated for all the combinations, and the optimal combination is selected. Note that if the number of sets Gb to be selected in the selection process is large, the total number of combinations becomes enormous, and the calculation takes a very long time. Therefore, the number of sets Gs is set so that the total number of combinations is not excessive, and the third time when the number of sets Gs grouped in the second grouping step does not fall below the set number (for example, 50). The grouping process is performed. For example, when the total number of receiving boxes 10 being stored is 240 and the number of sets Gs is 120 in the first grouping process, the number of groups Gb is 60 in the second grouping process. Then, the third grouping step of grouping the group Gb into groups of two is performed, and the number of groups is reduced to 30.

  When a plurality of combinations of four groups Gb (hereinafter referred to as group Go) are selected in the selection step, the sum of the priorities of the receiving boxes 10 belonging to the four groups Gb constituting each group is The highest group Go is preferentially shipped to the belt assembly process. In FIG. 3D, the group Go includes a set Gb of the receiving boxes 10 having the priorities “1”, “8”, “2”, and “9”, and the priorities “3”, “5”, “6”, and “ A state in which the receiving box 10 including the set Gb of “7” is selected is shown. In this case, the group Go having the highest sum total of the priorities of the receiving boxes 10 is a group including the set Gb of the receiving boxes 10 having the priorities “1”, “8”, “2”, and “9”. The first place.

  Here, in the present embodiment, in the grouping process, the receiving box 10 in which the dimensional accuracy is bad or the elapsed time from the manufacturing is long, that is, the poorly-made element is stored is preferentially extracted at an early stage. The receiving box 10 can be selected from a larger number of receiving boxes 10. Therefore, even if the receiving box 10 stores an element with poor dimensional accuracy, the average dimensional accuracy of a set including the element approaches the tolerance center, and there is a high possibility that this set is selected and shipped in the selection process. Become. Furthermore, since the group Go having the highest priority sum of the receiving boxes 10 is preferentially shipped to the belt assembling process, the possibility of shipping the receiving boxes 10 containing the poorly-made elements is further increased. As a result, the yield is improved.

  Although it is possible to ship the first group Go of the shipping order determined as described above as it is, in this embodiment, the receiving box 10 that stores the poorly-made elements is shipped with higher priority. For this reason, the following adjustment process is performed before shipment. That is, in the adjustment process, among the receiving boxes 10 belonging to the first group Go of the shipping order having the highest sum of the priorities of the receiving boxes 10 selected in the selecting process, the priority of the receiving boxes 10 other than the group Go is not included. The receiving box 10 lower than the priority of the receiving box 10 is replaced with another receiving box 10 as long as the condition that the average dimensional accuracy of the element 1 falls within the tolerance range is satisfied. For example, in the case shown in FIG. 3 (d), the group Go having the first shipping order is assigned a priority level higher than the receiving boxes 10 having the priorities “3”, “5”, “6”, and “7” that do not belong to this group Go. The low priority “8”, “9”... Receiving box 10 is contained, and if the above condition is satisfied, the low priority receiving boxes 10 are assigned priority “3” “5” “6” “7”. Replace with the receiving box 10.

  However, if the replacement is performed as described above, the average dimensional accuracy of the element 1 of the group Go that is second or lower in the shipping order will deteriorate. Therefore, the grouping process and the selection process are performed on the receiving boxes 10 excluding the receiving boxes 10 belonging to the first group Go of the shipping order after replacement, and the group Go to be shipped next is selected.

  In the above embodiment, the thickness difference on both sides in the width direction of the body part 2 is adopted as one of the management items of the dimensional accuracy, but the number of elements 1 constituting one belt is determined from this thickness difference. It is also possible to calculate a clearance difference on both sides in the width direction in the belt assembly state in consideration, and to use this clearance difference as a management item of dimensional accuracy instead of the plate thickness difference on both sides in the width direction of the body portion 2.

  Moreover, in the said embodiment, although the receiving box 10 which receives the element 1 punched by the punching part of the press apparatus was provided for every punching part, as shown to Fig.4 (a)-(f), element 1 is provided. For example, at the center of the lower end of the body portion 2, a cut mark 1a is attached in a different manner for each punched portion by punching of the punched portion (including the case where the mark 1a is not attached as shown in FIG. 4A), After the elements 1 punched by a plurality of punching portions are discharged together from the press device, the element 1 is sorted for each punching portion by a sorting device having a means for identifying the mark 1a and stored in a receiving box corresponding to each punching portion. You may make it do.

(a) The front view which shows the element of the belt for continuously variable transmission, (b) Sectional drawing of an element. The flowchart which shows embodiment of the method of this invention. (a)-(d) The figure which shows each process of this invention method visually. The figure which shows the aspect of the marking with respect to (a)-(f) element.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Element, 2 ... Body part, 3 ... Neck part, 4 ... Head part, 10 ... Receptacle box (element group).

Claims (7)

Shipment management of a plate-like element having a body part on the inner circumference side of the belt for a continuously variable transmission and a head part on the outer circumference side of the belt connected to the body part via a neck part. A method,
In a group of elements with almost the same dimensional accuracy as one element group, a predetermined number of element groups are selected from a plurality of stored element groups and shipped to the belt assembly process.
An element group in which a grouping process for grouping a plurality of element groups into groups each having two elements so that the average dimensional accuracy of each group of elements satisfies a predetermined condition After considering each one set of each as one element group in the next grouping step, until the number of sets of element groups is reduced below a predetermined set number,
As a group shipped from the element group grouped in the grouping process to the belt assembly process, the number of elements obtained by subtracting the predetermined number from the number of element groups belonging to one group is an average of the elements of these groups. Management method for the element of a continuously variable transmission belt, wherein a selection step is performed in which the dimensional accuracy is selected in such a combination as close as possible to the center of the tolerance range.   Based on the dimensional accuracy of each element group, a plurality of element groups are prioritized so that the lower the dimensional accuracy, the higher the priority, and in the grouping step, among the element groups that have not yet been assembled. The extraction process for extracting the highest priority element group and the element group that has the same set as the extracted element group, the element group whose average dimensional accuracy is closest to the center of the tolerance range is still 2. The element shipping management method for a continuously variable transmission belt according to claim 1, wherein a selection step of selecting from an ungrouped element group is repeated.   When there are a plurality of items including the thickness difference between the body part and the head part of the element and the thickness difference between both sides in the width direction of the body part as the management items related to the dimensional accuracy, the median tolerance of each of these management items 3. The shipment management method for an element of a continuously variable transmission belt according to claim 2, wherein a Euclidean distance based on a deviation with respect to is calculated, and the priority increases as the Euclidean distance increases.   The priority is determined by taking into account the dimensional accuracy of the element and the elapsed time from the manufacture, so that the priority is higher for the element group having a longer elapsed time from the manufacture even if the dimensional accuracy of the element is the same. 4. A method for shipping management of elements of a belt for continuously variable transmission according to claim 2 or 3.   In the second and subsequent grouping steps, the priority of the highest element group among the element groups belonging to each group of the element group grouped in the previous grouping step is set as the priority representing the group. 5. The element management method for a continuously variable transmission belt according to any one of claims 2 to 4, wherein a group of element groups is extracted in the extraction step.   When a plurality of combinations of element groups are selected in the selection step, a combination set having the highest sum of priorities of element groups belonging to each combination set is preferentially shipped to the belt assembling step. 6. A method for managing the shipment of elements of a belt for a continuously variable transmission according to any one of claims 2 to 5.   An element group that is selected in the selection step and has a lower priority than the priority of other element groups that do not belong to the combination set among the element groups that belong to the combination set having the highest sum of the priority levels of the element group, As long as the condition that the average dimensional accuracy of the elements is within the tolerance range is satisfied, an adjustment process is performed to replace the element group with the other element group. 7. The shipment management method for an element of a continuously variable transmission belt according to claim 6, wherein the step and the selection step are performed again.

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