JP4408300B2 - Steel sheet supply system to automobile manufacturing plant - Google Patents

Description

  The present invention relates to a steel sheet supply system from an iron works to an automobile manufacturing factory.

  In an automobile manufacturing plant, a steel sheet delivered in the form of a coil from an iron mill is cut into a predetermined size in a blank process while being unrolled by an uncoiler, and then the blank is press-formed in a press process. Products are welded to a desired shape in the welding process to produce automobile bodies and other parts. (Patent Document 1)

  In such an automobile manufacturing process, a so-called “kanban system” is adopted in which the required amount is sequentially requested from the final process to the previous process based on the number of daily production plans. Therefore, the blank process, which is the first process of the automobile manufacturing process, is also required each time from the press process, which is the next process, at the time.

  On the other hand, steelworks manufacture material coils systematically to prevent shortages based on the monthly production plan of the automobile manufacturing plant, and then split the coils in the final process and ship them as divided coils with adjusted weights. . The number of coil divisions at this time is determined so that the weight of the divided coils falls within the allowable weight range on the receiving side. The number of coils shipped is adjusted so that the sum of the coil weights after the division matches the monthly usage weight. For this reason, individual coil weights usually do not match the demands from the daily pressing process in an automobile manufacturing plant.

  For this reason, in the blank process of an automobile manufacturing factory, in order to avoid line stoppage, it is always necessary to have more coils than required by the press process, and after manufacturing the required amount of blanks, the uncoiler is reversed. Then, the steel sheet is rewound, and the rewound coil is stored in the coil storage area until the next processing is started. In this way, the “kanban method” in the subsequent processes is established in the blank process.

However, because the blank line must be stopped during the rewinding operation, the production capacity is reduced, and equipment for quickly rewinding is required for each blank line. Since storage space is required and extra space is occupied, and there are various types of steel sheets for each part, the management of the unwound coil becomes cumbersome and management costs increase, and short end materials that cannot be unwound are generated. As a result, there was a lot of problems such as yield loss due to the necessity of disposal, and the production capacity being reduced because the line was stopped during the milling.
JP 2003-31349 A

  The present invention solves the above-described conventional problems, and can reduce the storage of excess coils in the blanking process of an automobile manufacturing factory, the rewinding work of a steel plate, the storage management of the rewinded coils, and the like. An object of the present invention is to provide a steel sheet supply system to an automobile manufacturing factory that can eliminate the waste loss of the material and can smoothly perform the production by the “kanban method”.

The present invention made in order to solve the above problems is a coil center installed between an automobile manufacturing factory equipped with a blanking process, a pressing process, and a welding process, and an ironworks that supplies steel sheets to the automobile manufacturing factory. In addition, a coil division line and a coil warehouse that are directly connected to the uncoiler, pinch roll, welder, cutter, length measuring machine, and recoiler are installed, and the coil shipped from the steel works is matched to the steel sheet demand in the blank process by this coil division line. The required amount is shipped to the automobile manufacturing factory at the required time while being stored in the coil warehouse, and the end portion of the remaining coil generated by the coil division is replaced with the start end portion of another coil by the welder. It is welded and wound with a recoiler, and is shipped as a single coil that can meet the required amount.

  According to the steel sheet supply system to the automobile manufacturing factory of the present invention, in the coil center installed between the automobile manufacturing factory and the steel factory, the coil shipped from the steel factory is used for the steel sheet demand in the blank process of the automobile manufacturing factory. Divide them together and supply the required amount to the automobile manufacturing plant at the required time. For this reason, it is no longer necessary to hold an excessive coil in the blank process of an automobile manufacturing factory, and no remaining material is generated in the blank process, which eliminates the need for rewinding work and storage of the rewinding coil. . Therefore, it is not necessary to install equipment for quickly rewinding each blank line.

According to the present invention, the end of the remaining coil can be connected to another coil and shipped as a single coil that can meet the required amount . Further, since the coil center can accommodate a large coil, it is not necessary to divide the large coil so as to be within the allowable weight range on the receiving side in the final process of the steelworks.

Hereinafter, preferred embodiments of the present invention will be described.
In FIG. 1, reference numeral 1 denotes an automobile manufacturing factory that performs production by the “kanban method”, and includes a blank process 2, a press process 3, and a welding process 4. The steel sheet delivered in the form of a coil is unwound by an uncoiler, cut into a predetermined size in the blank process 2 to produce a blank, this blank is press-formed in the press process 3, and welded to the desired shape in the welding process 4. ing.

  As indicated by the arrows, a processing request by kanban is made from the subsequent process to the previous process based on the daily production plan, and the previous process supplies the processed material to the subsequent process as required. Therefore, the blank process 2 has a required number of blanks and a required time from the press process 3, and the blank process 2 has to obtain a steel plate necessary for producing the blank from the steelworks 5.

  As described above, conventionally, the steel plate coil was directly sent from the steel mill 5 to the automobile manufacturing factory 1, but in the present invention, the coil center 6 is installed between the steel factory 5 and the automobile manufacturing factory 1, and the steel manufacturing is performed. The large coil shipped from the location 5 is divided into the required size (weight) at the coil center 6 and the required amount is supplied to the automobile manufacturing factory 1 at the required time according to the demand.

  The coil center 6 is provided with a coil dividing line 7. As shown in FIG. 2, the coil dividing line 7 is a line in which a pinch roll 9, a cutter 10, a length measuring device 11, and a recoiler 12 are directly connected to the subsequent stage of the uncoiler 8 that can handle a large coil shipped from the ironworks 5. .

  The uncoiler 8 and the pinch roll 9 are devices for paying out the steel plate from the coil C, and have a function capable of rewinding by reversing the rotation direction. The cutter 10 and the length measuring machine 11 are apparatuses for cutting at a predetermined length position while measuring the length of the steel sheet delivered from the uncoiler 8. The recoiler 12 is a device that winds up the discharged steel sheet. The uncoiler 8 is provided with a main carriage 13 for conveying a large coil and a sub carriage 14 for taking out the coil that has been rewound. In addition, it is preferable to provide a trim device that cuts the steel plate, a coil dividing device that can cut the steel plate in the width direction, and the like.

  The coil dividing line 7 in which each of these devices is arranged in series divides the large coil shipped from the steelworks 5 into an amount (length / weight) that meets the requirements from the blank process 2 of the automobile manufacturing factory 1, It can be a small coil. The divided coils are shipped once a day or several times a day, and a necessary amount is shipped from the coil center 6 to the automobile manufacturing factory 1 at a required time. The coil center 6 is preferably located at a short distance from the automobile manufacturing factory 1 in order to supply the steel sheet to the automobile manufacturing factory 1 without hindrance.

  That is, according to the present invention, when a coil is supplied from the coil center 6 to the automobile manufacturing factory 1, a necessary amount is naturally supplied at a required time, and this is a steel sheet supply system incorporating the concept of time. Accordingly, the temporary placement time of the coil supplied from the coil center 6 to the automobile manufacturing factory 1 is short, which is very advantageous.

  When the large coil is divided into the required length by the coil dividing line 7 as described above, a remaining material cut by the cutter 10 is generated, and this is recoiled by the recoiler 12 to obtain a remaining material coil. For this reason, the coil center 6 needs to have a coil warehouse for storing small remaining coil in addition to the coil dividing line 7. FIG. 3 is a diagram showing an example of the layout of the coil center 6. The coil division line 7 is installed between the material yard 15 for receiving a large coil shipped from the ironworks 5 and the product yard 16, and the product yard. A three-dimensional warehouse 17 for small remaining material coils and product coils is provided on the side of 16. The product yard 16 is a space for flatly placing medium or large coils and other products, and the three-dimensional warehouse 17 is a storage space dedicated to small coils.

  A coil receiving port 18 of the three-dimensional warehouse 17 is provided on the exit side of the coil dividing line 7, and the recoiled remaining coil is fed into the three-dimensional warehouse 17. Each product yard 16 is provided with one or more coil discharge outlets 19 so that the coils stored in the three-dimensional warehouse 17 can be discharged. In addition, 20 is a vehicle pit for receiving and shipping, and 21 is a material crane for handling coils.

Such a coil center 6 can not only divide the coil shipped from the steelworks 5 according to the steel plate demand in the blank process 2 and ship it to the automobile manufacturing factory 1, but also the material yard 15 and the three-dimensional warehouse 17. The remaining coil that has been rewound or recoiled in a coil warehouse such as can be stored. This remaining material coil is stored in the three-dimensional warehouse 17 until the next shipping request is made, and when the next requested shipping amount exceeds the remaining material coil amount, the coil is discharged from the coil outlet of the three-dimensional warehouse 17 and a new coil is obtained. It is shipped as a required weight in combination. Fig. 4 shows how this is done. The remaining coil produced in A and the shortage sampled from the top of another coil in B are combined into a set so that the required amount can be handled with two coils. It can be shipped to the automobile manufacturing factory 1.

  The remaining coil is different in steel type, plate thickness, plate width, and length (weight). Therefore, it is not easy to manage in the automobile manufacturing factory 1, and in the case of a small amount, it is often discarded as scrap. However, in the coil center 6, it is possible to easily manage the small remaining coil by using the three-dimensional warehouse 17 that is managed by the computer, and the disposal can be minimized, so there is no waste.

In addition, in the automobile manufacturing factory 1, there is a case where the required amount is not a plurality of coils as described above and a delivery as a single coil is required. For this reason, in this invention, as shown in FIG. 5, the welding machine 22 is installed between the pinch roll 9 and the cutter 10 of the coil dividing line 7, and the terminal part of a remaining coil is welded with the starting part of another coil. Then, it is wound up by the recoiler 12 and shipped as a single coil. In this case, it is preferable to mark the welded portion and reject the portion in the blank process 2 of the automobile manufacturing factory 1 to prevent generation of defective products.

The advantages of the present invention described above are summarized as follows.
1. The amount of steel plate required in the blank process 2 of the automobile manufacturing factory 1 can be supplied from the coil center 6 at a required time, and the automobile manufacturing factory 1 does not need to have an extra coil stock.
2. Since no remaining material is generated in the automobile manufacturing factory 1, rewinding in the blank process 2 is not necessary, and line capability can be improved.
3. Therefore, it is not necessary to provide a rewinding device in each blank process 2 of the automobile manufacturing factory 1.
4). In the automobile manufacturing factory 1, the storage location and storage management of the coil that has been rewound are not required.
5). The amount of scrap disposal at the automobile manufacturing plant 1 is drastically reduced, and yield loss and machine damage are eliminated.
6). Ironworks can be shipped as large coils, eliminating the need for coil splitting in the final process.
7). At the coil center, it is possible to manage the remaining coil and combine it with a new coil at the next shipment to deliver it as a single coil, thus eliminating the waste of resources.
8). In this way, the “kanban method” in the automobile manufacturing factory 1 can be extended to a steel material procurement process from an ironworks.

It is a block diagram which shows embodiment of this invention. It is explanatory drawing of a coil division | segmentation line. It is a layout diagram of a processing center. It is explanatory drawing at the time of shipping as a required weight combining a remaining material coil with a new coil. It is explanatory drawing which shows the modification of a coil division | segmentation line.

DESCRIPTION OF SYMBOLS 1 Automobile manufacturing factory 2 Blanking process 3 Pressing process 4 Welding process 5 Ironworks 6 Coil center 7 Coil split line 8 Uncoiler 9 Pinch roll 10 Cutter 11 Measuring machine 12 Recoiler 13 Master truck 14 Child carriage 15 Material yard 16 Product yard 17 Three-dimensional Warehouse 18 Coil receiving port 19 Coil delivery port 20 Vehicle pit 21 Material crane 22 Welding machine

Claims (1)

In the coil center installed between an automobile manufacturing plant equipped with a blanking process, pressing process, and welding process, and a steel mill that supplies steel sheets to this automobile manufacturing factory, an uncoiler, pinch roll, welding machine, cutter, length measurement Coil division line and coil warehouse directly connected to the machine and recoiler are provided, and the coil shipped from the steel mill is divided according to the steel plate demand in the blank process by this coil division line, and the necessary quantity is stored in the coil warehouse Is shipped to the automobile manufacturing factory at the required time, and the end of the remaining coil generated by the coil split is welded to the start of the other coil by the welding machine and wound up with a recoiler. A steel sheet supply system to an automobile manufacturing factory, which is shipped as a single coil .

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