JPH0358853B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ranking control method in a mixed production line, such as an automobile assembly line, in which a plurality of types of products of different vehicle types are mixed and sent through the production line.

Automobile production lines usually consist of a welding process, a painting process, an outfitting process, etc. However, due to sales policies and market demands, there are so-called mixed production lines in which multiple types of cars with different specifications are produced on the same production line. A production line method is adopted.

As a result, there is a problem in that the number of man-hours in each process differs depending on the vehicle model. Therefore, it is possible to level the production order and balance the man-hours, but the demands for leveling of each process such as welding, painting, and outfitting do not necessarily match, and it is difficult to create a consistent leveling order for each process. It is. Moreover, even if a consistent leveling order could be created for each process, rework is unavoidable in the welding process and painting process. When making such modifications, the production vehicle body is removed from the production line and then rejoined the production line after the modification, which changes the predetermined production order and maintains the leveled order. The problem is that it can't be done.

Therefore, in the past, a method has been adopted in which storage is provided between each process, the produced car bodies are stored by type, and then reassembled to meet the requirements of the next process. However, it is very difficult to rearrange the storage between each process, and storing products by type breaks the entire predetermined production order, which tends to amplify the disorder in the order. Furthermore, storing produced vehicle bodies by type requires a large storage space, making it difficult to manage the produced vehicle bodies.

This invention was made in view of the above-mentioned circumstances, and its purpose is to ensure that the production is carried out according to a predetermined production order, and that the production order is disrupted due to branching, merging, etc. in the upstream production process. Another object of the present invention is to provide a method for controlling the order in a mixed production line, which allows the production order to be adjusted to the production order or a similar order in storage, and to be sent to the downstream production process.

That is, the present invention provides a storage at a relay point between an upstream production process and a downstream production process in which a plurality of types of products with different production conditions are passed in the order of their production order, and stores the products carried out from the upstream production process in the storage. In a mixed production line that temporarily stores the product and then transports it to the downstream production process, the above storage is configured with multiple rows of first-in, first-out storage lanes with designated priorities, and
The first basic principle is to assign serial numbers to each of the above-mentioned production parts in accordance with their production order, and to prioritize the products carried out from the upstream production process and store them in the storage lane in descending order of number. When the production order is disrupted due to branching, merging, etc., the production item is placed at the end of the production items already stocked in the storage lane, and if there is a production item with a younger number than the item, then the production item is placed in the storage lane. The second principle is to enter the stock after a product with a production rank closer to you, and if there is no product with a lower number than you, store it in an empty storage lane where no product is stored. The third basic rule is that when there is no produced product with a lower number than you at the end and there is no empty storage lane, you should store the product in the storage lane where the product with the production rank closest to you is stored at the end. The gist of the present invention is a method for controlling the order in a mixed production line, which is characterized in that the products are ordered according to the first, second, and third principles before being delivered to the downstream production process. .

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

1 is an upstream production process such as a painting process; 2 is an upstream production process such as a painting process;
is a downstream production process such as an outfitting process.
A storage 3 is provided between the carrying-out section 1a of the upstream production process 1 and the carrying-in section 2a of the downstream production process 2.
is provided. The upstream production process 1 and the downstream production process 2 are comprised of belt conveyors that run at low speed (2 to 3 m/min) and are configured to convey multiple types of products A, such as automobiles, with different vehicle types, colors, etc. , in the upstream production process 1, specified painting work is performed on the product A,
In the downstream production process 2, parts are attached to the product A that has been painted. Furthermore, the above-mentioned product A... is given a serial number according to the production order required from the viewpoint of sales policy, market demand, etc., and the product A... flowing through the upstream production process 1 is basically They are transported in descending order of numbers. Further, the storage 3 is constituted by a plurality of rows, for example, first to fifth storage lanes 4a to 4e, and conveyors 7 that run only in six directions from the storage side 5 to the storage side 6 are arranged in parallel. These conveyors 7... have first to fifth stages 8a to 8e from the output side 6 to the input side 5.
These first to fifth stages 8a-
One production item A per 8e can be temporarily stored on a first-in, first-out basis. Furthermore, the first to fifth storage lanes 4a to 4e are prioritized in that order, and the upstream production process 1
The first principle is that the products A carried out from the warehouse are sequentially stored from the first storage lane 4a according to the production order. And the 1st to 5th
If there are products already stored in the storage lanes 4a to 4e, if there is a production product A with a lower number than you at the end of the storage lanes 4a to 4e, the product A that is the closest to you among them When the product A is received after the product A in the production order, and there is no product A with a lower number than the product A, an empty storage lane among the first to fifth storage lanes 4a to 4e where the product A is not received. The second basic principle is to stock up on. Furthermore, there is no production product with a younger number than the production product A at the end of the production product A that has already been stored, and the first to fifth storage lanes 4a to 4
The third principle is that when there is no empty storage lane in e, the product is stored in the storage lanes 4a to 4e, where the product A of the production order closest to the product A is stored at the end.

Therefore, the product A in upstream production process 1
The lines flow in descending order of numbers according to a predetermined production order, but if a coating defect or the like occurs, they must be removed from the line and reworked. Therefore, a disturbance occurs in the production order, but the disturbance is corrected in the storage 3 and the downstream production process 2
can be transported to. That is, as shown in FIG. 2a, if the order of the products A carried out from the upstream production process 1 is,
Based on the first and second basics, the item is stored in the first storage lane 4a, and when the next one comes, the first storage lane 4a does not have a number younger than the one, so the second storage lane 4a is stored.
It is stored in the first stage 8a of b. next,
When the number arrives, the last one in the first storage lane 4a is younger than me and the closest, so
is stored in the fifth stage 8e of the first storage lane 4a. Furthermore, when comes, these are stored in the second storage lane 4b sequentially, but when comes after, the second storage lane 4b does not have a number younger than itself, so it is stored in the third storage lane 4b. 4c is stored in the first stage 8a, and is sequentially stored in the fourth and fifth stages 8d and 8e of the second storage lane 4b.

Also, as shown in Fig. 2b, when the above sequence continues, the third storage lane 4c does not have a number younger than its own, so it is stored in the fourth storage lane 4d, and then the upstream production process is carried out in the next order. When the items are taken out from storage lane 1, they are stored in storage lanes 4c and 4e, respectively.
Then, as described above, since there is no number smaller than itself, it enters the fifth storage lane 4e.
Furthermore, as shown in Fig. 2c, when the following number comes, there is no number younger than the one, and there is no vacancy in the first stage 8a of the first to fifth storage lanes 4a to 4e. Therefore, based on the third principle, the product A closest to it, i.e. the fifth storage lane 4e, is followed by the second storage lane 4e.
It is stocked at stage 8b.

The produced goods A... stored in the storage 3 in this way are stored in the first to fifth storage lanes 4a.
4e, that is, at the first stage 8a, are sequentially discharged from the warehouse starting from the lowest in the production order and transported to the downstream production process 3. Here, as shown in FIG. 2c, the order of unloading of the manufactured goods A... stored in the first to fifth storage lanes 4a to 4e is as follows.
Therefore, it is possible to perform order rectification of the produced articles A.

As explained above, in this invention, storage consisting of multiple rows of storage lanes is
Based on the third principle, the products carried out from the upstream production process are arranged in order of production order or in a state close to it and then delivered to the downstream production process. This has the effect that even if turbulence occurs, it can be rectified in the storage and flowed to the downstream production process.

[Brief explanation of drawings]

1 to 2 a to 2 c show one embodiment of the present invention, in which FIG. 1 is a schematic plan view of a production line, and FIGS. 2 a, b, and c are similarly explanatory diagrams. 1...Upstream production process, 2...Downstream production process, 3...Storage, 4a to 4e...Storage lane, A...
produced goods.

Claims (1)

[Claims] 1. A storage is provided at a relay point between an upstream production process and a downstream production process in which multiple types of products with different production conditions are passed in the order of their production order, and after temporarily storing the products carried out from the above-mentioned upstream production process in the storage, In the mixed production line that transports the parts to the downstream production process, the above-mentioned storage is configured with multiple rows of first-in, first-out storage lanes with designated priorities, and each production part is serially numbered in the order of its production order, and the storage from the upstream production process is The first step is to prioritize the output products and store them in the storage lane in descending order of number.
Based on this principle, when a disruption in the production order occurs due to branching, merging, etc. in the upstream production process, the product is placed at the end of the products already stocked in the storage lane, where a product with a younger number than the product is placed at the end of the products already stocked in the storage lane. If there is a product in the production order that is closest to you, it will be stored in the storage lane, and if there is no product with a lower number than you, it will be stored in an empty storage lane where no product is stored. In addition, if there is no produced product with a lower number than you at the end of the list and there are no empty storage lanes, store the product in the storage lane where the product with the production rank closest to you is stored at the end of the list. A method for controlling the order in a mixed production line, which is characterized in that the third basic principle is that the products are ordered according to the first, second, and third basics, and then transported to the downstream production process. .