JP3006380B2 - Logistics control method for production line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a first production line (rolling line) in which it is impossible or extremely difficult to line off a material being produced, such as a steel pipe production line, A second production line (refinement line), which is easy to turn on, is directly connected, and the second production line is a second production line divided into a plurality of zones arranged in series . The present invention relates to a distribution control method for preventing a stop of a first production line due to a stagnation of materials in the production line.

[0002]

2. Description of the Related Art For example, an optimum distribution control method in a refining process of a steel pipe production line is disclosed in Japanese Patent Application Laid-Open No. 63-199014.
The method disclosed in Japanese Patent Application Laid-Open Publication No. H10-209,004 is taken. FIG. 3 is a block diagram showing an apparatus configuration when this method is performed in a steel bar manufacturing facility. The rolling mill 21 and the refining equipment 26 are installed in parallel and in multiple stages downstream of the rolling mill 21. The material sorting device 23 and the material sorting device are provided between the rolling mill 21 and the work place 22 for temporarily holding the material provided in front of each refinement facility 26 and between the work place 25 between the refinement facilities 26. A transfer machine 24 is provided for transferring the material from 23 to each work place 25.

[0003] A schedule for carrying in materials from the rolling mill 21 to each refining facility 26 and a refining facility 26 from the upstream refining facility 26 to the downstream.
Material loading time storage device 31 for storing material loading into
A physical distribution state detection storage device 34 connected to each in-process yard 25 and the refining equipment 26 for storing the processing status and the material processing status on the equipment over time, and an equipment operation schedule storage device 35 for storing operation information of each equipment. And a manufacturing specification storage device 32 for storing the order of refinement processing of each material, and an operation target storage device 33 for storing operation targets, are connected to an arithmetic device 30 for controlling the material sorting device 23. Based on the operation target and the material supply prediction in the upper process for each unit time, the work in progress prediction before each facility, and the work prediction in the lower process, a plurality of parallel processes are performed so that the operation rate is maximized and the excess work in progress is minimized. The material distribution equipment is determined from the equipment, and the work load in each refining equipment 26 is made uniform.

[0004]

However, the physical distribution control method disclosed in Japanese Patent Application Laid-Open No. 63-199014 has the following problems. In other words, since it is assumed that there is an in-process place between the rolling line and the finishing line, the production line is directly connected to the rolling and finishing line, and depending on the manufacturing dimensions and processing specifications, the processing capacity of the finishing line is lower than the rolling capacity. Then, even if the above method is used, if congestion occurs at each point, there is a problem that rolling has to be stopped.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. For example, in a steel pipe production line in which rolling and refining are directly connected, rolling is not stopped due to material congestion in the refining line. It aims to provide a physical distribution control method.

[0006]

According to the present invention, a manufacturing line according to the present invention is provided.
The logistics control method of
After the first production line, which is impossible or extremely difficult
Second, it is easy to line-off and line-on the material.
The second production line is directly connected to the second production line.
Manufacturing line divided into multiple zones arranged in series
In this method, the position of the material on the production line is determined by the material tracking device to determine the number of materials remaining in each zone of the second production line, and this number and each zone are determined. Calculate the retention density of the material in each zone from the maximum possible number preset for each zone,
The congestion state of the material in each zone is determined from the calculated residence density and the flow rate of the material into each zone measured at the entrance of each zone, and each zone is determined according to the determined congestion state. material lined on or line off of the emissions, thereby preventing the stopping of the first production process.

[0007]

[Operation] Material congestion occurs in each zone , and as a result,
When it is determined that a line stop is likely to occur in the upstream zone or the first production line, a second traffic jam is likely to occur .
The material in the zone of the production line is splashed off-line from the line to eliminate traffic congestion. Then, zone - when it is determined that there is room to accommodate the excess material in the down and processes to return the material began bouncing offline line. Therefore, the operation can be continued without stopping the first production line.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which the present invention is applied to distribution control of a steel pipe production line will be described with reference to FIG. FIG. 1 is a block diagram showing an apparatus configuration for performing this distribution control method. In this physical distribution control method, the material tracking device 1 ascertains the manufacturing specifications and the movement status of each material on the production line for the total number of materials, and outputs signals from the material tracking device 1 for each zone of the refinement line. To the retention density calculator 2 for calculating the retention density of the material, and the number of materials existing on the line of each of the zones 3a, 3b or 3c divided into a plurality of zones of the refining equipment and the preset maximum possible number of materials Then, the residence density of the material in the zone 3a, 3b or 3c is calculated.

The calculated residence density and the moving speed v of the material measured by the speedometer 4 provided at the entrance of the zone are sent to the zone-based physical distribution state determiner 5, and the traffic congestion state in the zone 3a, 3b or 3c is determined. judge. The determination result is sent to the intra-zone transfer controller 6 and, according to an instruction from the intra-zone transfer controller 6, the materials in the zone are popped off-line by the off-line pop-up device 7 or the off-line Is returned on the line by the line raising device 8.

The distribution control method will be described in more detail. In the residence density calculator 2, the maximum number P _imax that can be retained in the zone and the number P _i existing in the zone are set in advance.
Then, the residence density ρ _i in the zone is calculated by the equation (1). ρ _i = P _i / P _imax (1) The calculated value of ρ _i is sent to the physical distribution state determiner 5 that determines the physical distribution state for each zone.
_From the value of _i and the moving speed v _{i of the} material measured by the speedometer 4 provided at the entrance of the zone, the physical distribution state in the zone is determined as follows.

[0011] Level _{1: ρ i ≧ α (%} ) and v _i ≦ v _a
When (alpha and v _a is the set value), to the line-up system 8 of the incoming side of the zone, if the current in the line increases, issues a line-up stop command, Level 2: ρ _i ≧ β (% ) And v _i ≦ v _b (β and v
_b is a set value, and when β ≧ α, v _b ≦ v _a ), an offline jump start command is output to the offline jump device 7 on the exit side of the zone. At this time, in order not to hinder the work after the off-line jumping out, the lots and the lots with the rating of each lot are jumped out in a unit that does not break down.

That is, when the same lot and the same rating are continuous, if the lot or the rating is different for every n pieces or less than n pieces, the jumping unit is divided at the boundary and the worker is notified from the offline jumping device. For example, an alarm is displayed for the lifting of the material, and the offline jumping is temporarily suspended. However, when the equipment in the next zone is performing reassignment work for the leading material lot on the exit side of the zone, the determination is made based on the input of the in-reassignment signal, and the jump-out does not start.

When traffic congestion is reduced by the above control,
Move to level 3. Level _{3: ρ i ≦ γ (%} ) and v _i ≧ v _c (gamma and v
_c is a set value, when it is _{γ ≦ α ≦ β, v b} ≦ v a ≦ v c), if the offline springing to start command, and outputs the offline springing to halt command.

Level 4: ρ _i ≦ δ (%) and v _i ≧ v _d
(Δ and v _d are set values, δ ≦ γ ≦ α ≦ β, v _b
≦ v when it becomes _{a ≦ v c ≦ v d)} , if the line-up halt command during, and outputs a line-up start command.

By applying the above control to all zones, the rolling of the steel pipe is not interrupted, so that the extraction speed of the rolling heating furnace can be maintained, and the fuel consumption rate of the heating furnace due to the rolling interruption can be maintained. , And an increase in scale loss of the heated steel material can be prevented.

FIG. 2 is a graph summarizing the transition of the rolling stop rate due to the monthly congestion line congestion when this distribution control method is applied. As a result of tuning the parameters for three months after the application, the rolling stop rate after that was 2
%, The rolling stop rate before applying this physical distribution control method was halved compared to the 4% level, indicating that the effect of the present invention is great.

[0017]

According to the present invention, it is possible to prevent the first production line from being stopped, so that, for example, it is possible to prevent a reduction in the fuel consumption rate of the heating furnace due to the interruption of rolling and an increase in the scale loss of the heated steel material. Can be.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an apparatus configuration when performing this distribution control method.

FIG. 2 is a graph summarizing the transition of a rolling stop rate every month when this distribution control method is applied.

FIG. 3 is an explanatory diagram showing a conventional physical distribution control method.

[Explanation of symbols]

 Reference Signs List 1 Material tracking device 2 Retention density calculator 3a, 3b, 3c Zone of refining equipment 4 Speedometer 5 Logistics status judging device 6 Transport controller 7 Offline pop-up device 8 Line raising device

Claims (1)

(57) [Claims] 1. A first production line in which it is impossible or extremely difficult to line off a material being produced is directly connected to a second production line in which material can be easily lined off / on. And the second production line is connected in series
A distribution control method in a production line divided into a plurality of zones arranged side by side, wherein a material tracking device determines a position of a material on a production line and stays in each zone of a second production line. The number of materials in each zone is determined, and the staying density of the material in each zone is calculated from the number and the maximum number of pieces which can be set in advance for each zone. The zone of the material measured at the zone entrance
The congestion state of the material in each zone is determined from the inflow speed into the zone, and the material in each zone is lined off or on according to the determined congestion state. A logistics control method for a production line, characterized by preventing stoppage.