JPH07164035A - Manufacturing line physical distribution control method - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent rolling from being interrupted due to congestion on the finishing line. [Structure] A signal from the material tracking device 1 is sent to a residence density calculator 2, and the number of materials existing on a line of each zone 3a, 3b or 3c divided into a plurality of conditioning equipment is set in advance. The retention density of the material in the zone 3a, 3b or 3c is calculated from the maximum number of existing materials. The calculated residence density and the moving speed v of the material measured by the speed meter 4 provided at the zone entrance are sent to the zone-by-zone physical distribution state determination device 5, and the zone 3a, 3b or 3c is sent.
Judgment of traffic congestion of materials in the area. The determination result is sent to the in-zone transfer controller 6, and the material in the zone is bounced off-line by the off-line jumping device 7 according to an instruction from the in-zone transfer controller 6 and the off-line material is off-line. Is returned to the line by the line lifting device 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a first production line (rolling line) in which it is difficult or extremely difficult to line off the material being produced, such as a steel pipe production line.
And the second production line (conditioning line), which makes it easy to turn the material off and on, are directly connected.
Relates to a physical distribution control method for preventing the first production line from being stopped due to the accumulation of material in the second production line in the production line divided into one or a plurality of zones.

[0002]

2. Description of the Related Art For example, as an optimum physical distribution control method in a refining process of a steel pipe manufacturing line, Japanese Patent Laid-Open No. 63-199014 is known.
The method disclosed in the publication is adopted. FIG. 3 is a block diagram showing an apparatus configuration when performing this method in a steel strip manufacturing facility. The rolling mill 21 and the conditioning equipment 26 are installed in parallel and in multiple stages downstream thereof. A material distribution device 23 and the material distribution device 23 are provided between the rolling mill 21 and the work-in-process yard 22 for temporarily storing the material provided in front of each of the rectification equipments 26 and between the work-in-process yard 25 between the respective rectification equipments 26. A carrier 24 is provided for transferring the material from 23 to each work-in-progress field 25.

[0003] Schedule of material loading from the rolling mill 21 to each of the conditioning equipment 26, and the upstream conditioning equipment 26 to the downstream conditioning equipment 26.
A material carry-in time storage device 31 for storing the material carry-in to the
A physical distribution state detection storage device 34 that is connected to each work-in-progress storage area 25 and the conditioning equipment 26 and stores the work-in-progress status and the material processing status on the equipment over time, and a facility operation schedule storage device 35 that stores the operation information of each equipment. The manufacturing specification storage device 32 that stores the adjustment processing order of each material and the operation target storage device 33 that stores the operation target are connected to the arithmetic device 30 that controls the material distribution device 23. Based on the above-mentioned operation target, material supply prediction in the upper process per unit time, in-process situation prediction before each equipment, and work prediction in the lower process, multiple parallels are used to maximize the operation rate and minimize the excess in-process quantity. The material distribution equipment is determined from among the equipment, and the work load in each of the conditioning equipment 26 is made uniform.

[0004]

However, the physical distribution control method disclosed in Japanese Patent Laid-Open No. 63-199014 described above has the following problems. In other words, since it is premised that there is a work-in-progress field between the rolling line and the conditioning line, it is a direct-connection manufacturing line for rolling and conditioning, and depending on the manufacturing dimensions and processing specifications, the line where the conditioning processing capacity loses the rolling capacity. However, even if the above method is adopted, there is a problem in that if congestion occurs at each point, rolling must be stopped.

The present invention has been made in order to solve the above-mentioned problems of the prior art. For example, in a steel pipe manufacturing line that is directly connected with rolling and rolling, the rolling is not stopped due to material congestion in the rolling line. The purpose is to provide a physical distribution control method.

[0006]

The above-mentioned problems are solved by determining the position of the material on the production line by the material tracking device and grasping the number of the retained material in each zone of the second manufacturing line. And the maximum number of possible presets for each zone, calculate the residence density of the material in each zone, and from the calculated residence density and the inflow velocity of the material into the zone measured at the inlet of each zone This is solved by determining the congestion state of the material in each zone, and turning off or on the line of the material in each zone according to the determined congestion state to prevent the stop of the first manufacturing process.

[0007]

[Function] When it is judged that congestion will occur in each zone and as a result, a stoppage will occur in the upstream zone or the first production line, the material of the conditioning line zone that is likely to cause congestion will be removed from the line. Bounce off the line and eliminate congestion. Then, when it is determined that there is room to accept the extra material in the zone, the material that has sprung off line is returned to the line for processing. Therefore, the operation can be continued without stopping the first manufacturing line.

[0008]

EXAMPLE An example in which the present invention is applied to physical distribution control of a steel pipe manufacturing line will be described with reference to FIG. FIG. 1 is a block diagram showing a device configuration when performing this physical distribution control method. In this physical distribution control method, the material tracking device 1 grasps the manufacturing specifications and movement status of each material on the production line for the total number of materials, and the signal from the material tracking device 1 is adjusted for each zone of the adjusting line. Sent to the residence density calculator 2 for calculating the residence density of the material, and the number of materials existing on the line of each zone 3a, 3b or 3c divided into a plurality of conditioning equipment and the maximum possible number of existing materials From the above, 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 zone entrance are sent to the zone-by-zone physical distribution state determination device 5 to check the traffic congestion condition of the material in the zone 3a, 3b or 3c. judge. The determination result is sent to the in-zone transfer controller 6, and the material in the zone is bounced off-line by the off-line jumping device 7 according to an instruction from the in-zone transfer controller 6 and the off-line material is off-line. Is returned to the line by the line lifting device 8.

More specifically, this physical distribution control method will be described. In the staying density computing unit 2, the preset maximum number of _stayable in-zone P _imax and the number of present in-zone P _{i in the} zone are set.
Therefore, the in-zone retention density ρ _i 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, and the physical distribution state determiner 5 calculates ρ _i
From the value of _i and the moving speed v _{i of the} material measured by the speedometer 4 provided at the zone entrance, the distribution state in the zone is determined as follows.

[0011] Level _{1: ρ i ≧ α (%} ) and v _i ≦ v _a
When (α and v _a are certain set values), if the line-up device 8 on the entry side of the zone is currently line-up, a line-up stop command is issued and level 2: ρ _i ≧ β (% ) And v _i ≦ v _b (β and v
_b is a set _{value, β ≧ α, v b ≦} v a) when the outputs offline springing to start command offline springing and 7 of the exit side of the zone. At this time, in order not to hinder the work after the offline jumping, the batches of the lots and the rating chunks for each number are grouped in units that do not break and are jumped out.

That is, when the same lot and the same rating are consecutive, if the lot or the rating is different for every n lines or within n lines, the jumping unit is divided at the boundary and the operator is notified by the offline jumping device. For example, an alarm is displayed when the material is hung up, and the offline jumping is temporarily stopped. However, if the equipment in the next zone is performing the reassembling work for the leading material lot on the exit side of the zone, the decision is made by inputting the reassembling signal, and the jumping does not start.

When the traffic congestion is alleviated by the above control,
Move to level 3. Level 3: ρ _i ≦ γ (%) and v _i ≧ v _c (γ 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, and 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 interruption of rolling can be maintained. Can be prevented 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 congestion of the trimming line every month when this physical distribution control method is applied. As a result of tuning the parameters for 3 months after the application, the rolling stop rate is 2 after that.
%, The rolling stop ratio before applying this physical distribution control method was in the 4% range, which was half that of the rolling stop ratio, which shows that the effect of the present invention is great.

[0017]

As described above, according to the present invention, it is possible to prevent the first production line from being stopped. Therefore, for example, it is possible to prevent the reduction of the fuel consumption rate of the heating furnace and the increase of the scale loss of the heating steel material due to the interruption of rolling. You can

[Brief description of drawings]

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

FIG. 2 is a graph summarizing the transition of rolling stop rates for each month when this physical distribution control method is applied.

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

[Explanation of symbols]

 1 Material Tracking Device 2 Residence Density Calculator 3a, 3b, 3c Zones for Conditioning Equipment 4 Speedometer 5 Logistics State Judgment Device 6 Transfer Controller 7 Offline Jumping Device 8 Line Raising Device

Claims (1)

[Claims] 1. A second production line in which it is easy to line-off and line-on a material directly after a first production line in which it is impossible or extremely difficult to line-off the material being manufactured is directly connected. The second production line is a physical distribution control method in the production line divided into one or a plurality of zones, and the second production is performed by determining the position of the material on the production line by the material tracking device. Grasping the number of materials staying in each zone of the line, calculating the staying density of the material in each zone from this number and the maximum possible number that can be preset in each zone, and calculating the staying Judging the density of the material in each zone from the density and the inflow velocity of the material into the zone measured at the entrance of each zone, the material in each zone is line-offed or lined according to the judged traffic congestion. A physical distribution control method for a manufacturing line, which is turned on to prevent a stop of the first manufacturing process.