JP3620714B2 - Mandrel bar management method and management apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mandrel bar management method and management apparatus used for seamless steel pipe manufacturing.
[0002]
[Prior art]
Many mandrel bars (hereinafter referred to as “bars”) used in mandrel mills for seamless steel pipes are used depending on the thickness of the steel pipe to be manufactured. Maintenance is extremely important.
[0003]
Conventionally, management in a mandrel bar storage place for storing such a mandrel bar has been performed for each outer diameter of the mandrel bar. That is, even if a bar has a slightly different outer diameter or a different rolling history (number of rollings, wrinkles, etc.), it is managed in units of lots classified for each predetermined outer diameter. For this reason, control of the mill according to the characteristics (outer diameter variation, wrinkles, etc.) for each bar constituting each lot cannot be performed, which causes variations in the quality of the rolled material.
[0004]
Here, in order to prevent a mixture of bars having different outer diameters, the mandrel bars are generally stored in a bar warehouse divided into predetermined sections fixed according to the outer diameters of the bars. When a mandrel bar is used for rolling, an outer diameter bar that matches the rolling material determined by the rolling schedule is selected from the mandrel bars stored in the bar warehouse (that is, an appropriate outer diameter bar is selected). When the goods are delivered to the bar warehouse after rolling, the outer diameter of the bar to be received is grasped and stored in the exact compartment corresponding to the outer diameter. There must be. Otherwise, when the bar is reused thereafter, rolling with an unsuitable outer diameter of the bar is performed, causing a rolling trouble, and in the worst case, there is a possibility of causing equipment destruction.
[0005]
As a means for solving such problems in the conventional management method, for example, Japanese Patent Application Laid-Open No. 7-251204 discloses a mandrel mill control device. The mandrel mill control device described in such a publication is based on the dimensions and quality information of the product after rolling, and the characteristics specific to the mandrel bar used during manufacture (the amount of wear of the bar, the position of defective parts such as wrinkles). Rotating the mandrel mill by estimating and storing and managing the estimated intrinsic characteristics of each mandrel bar stored in the warehouse during and after rolling, and tracking the unique characteristics of the mandrel bar during reuse The number and gap are initially set. That is, in the above publication, it can be said that a method of managing a bar for each bar being rolled and a bar stored in a warehouse is disclosed.
[0006]
[Problems to be solved by the invention]
According to the management method described in the above publication, the tracking of the bar for each bar makes it impossible to control the mill according to the characteristics of each bar for the management in units of lots, which has been a problem in the past. It is also possible to solve the problem that rolling trouble at the time of reuse can be caused when stored in the wrong bar warehouse section.
[0007]
However, the management of each mandrel bar has a problem that the loading / unloading work is complicated and the mandrel bar tracking system and computer system for realizing the management of each mandrel bar are complicated.
[0008]
The present invention has been made to solve such problems of the prior art, and can perform efficient mandrel bar management without requiring complicated operations and complicated system configurations, and is suitable for rolled materials. It is an object of the present invention to provide a mandrel bar management method and management apparatus that can reliably provide a mandrel bar to a mandrel mill.
[0009]
[Means for Solving the Problems]
In order to solve such a problem, the present invention relates to a mandrel bar management method used for seamless steel pipe manufacturing, in which a first identification means is associated with each mandrel bar to identify a mandrel bar individual, and a rolling schedule is provided. Accordingly, in order to identify each mandrel bar group composed of a plurality of mandrel bars conveyed together from the bar warehouse to the rolling line, each mandrel bar group is associated with a second identification means, and the mandrel bar group is rolled. When arriving at the line, the mandrel bar group is inspected based on the second identification means to determine whether or not the mandrel bar group meets a predetermined rolling schedule. Whether or not the mandrel bar group is a predetermined mandrel bar is checked based on the first identification means. Mandrel bar management method for there is provided a.
[0010]
According to such an invention, from the bar warehouse to the rolling line (including storage in the bar warehouse), a plurality of mandrel bars are not based on the management of each mandrel bar but based on the second identification means. While it is possible to manage with a group of mandrel bars collected, it is possible to manage each mandrel bar in the rolling line based on the first identification means. Therefore, compared to the case where management is performed for each mandrel bar in all steps, it is possible to perform efficient bar management without requiring complicated work and complicated system configuration.
[0011]
In addition, since the second identification means is used to check whether or not the mandrel bar group arriving at the rolling line conforms to a predetermined rolling schedule, it is first prevented that an incorrect mandrel bar group is carried into the rolling line. it can. Furthermore, even if the mandrel bar group conforms to the rolling schedule, it may be considered that each mandrel bar group constituting the mandrel bar group is incompatible, but according to the present invention, the mandrel bar group is determined in advance. Whether or not the bar is a mandrel bar is inspected based on the first identification means, so that it is possible to reliably prevent the incompatible bar from being introduced into the rolling line and to avoid a rolling trouble.
[0012]
Preferably, according to the temperature of the mandrel bar when the mandrel bar used for the previous rolling is unloaded from the rolling line, the unloading time, and the time when the mandrel bar is put into the rolling line to be used for the current rolling, The initial temperature of the mandrel bar subjected to is calculated.
[0013]
Depending on the rolling schedule, the mandrel bar may be unloaded from the rolling line and then charged again before being cooled to air and returned to room temperature. Conventionally, even in such a case, since the mandrel mill setup calculation was performed assuming that the initial temperature of the bar was normal temperature, there was a problem that the product dimensional accuracy related to the first rolling after the introduction of the bar was poor. According to the present invention, the temperature drop of the bar is calculated based on the temperature of the mandrel bar when the mandrel bar used for the previous rolling is unloaded from the rolling line and the time difference from the bar unloading to the bar loading. Since the initial temperature of the mandrel bar to be used is calculated, the initial temperature can be used for the setup calculation. Therefore, the dimensional accuracy regarding the first rolling after the mandrel bar is charged can be improved.
[0014]
Further, the present invention is a mandrel bar management device used for seamless steel pipe manufacturing, wherein a first identification means for identifying individual mandrel bars and a mandrel bar group consisting of a plurality of mandrel bars according to a rolling schedule Transport support means for transporting and supporting from the bar warehouse to the rolling line as a whole, and second identification means provided in the transport support means for identifying one transport support means from other transport support means, When the transport support means arrives at the rolling line, whether the transport support means conforms to a predetermined rolling schedule is inspected based on the second identification means and is transported and supported by the transport support means. The first identification means determines whether each mandrel bar constituting the mandrel bar group is a mandrel bar predetermined for the mandrel bar group. Further comprising an inspection means for on the basis of examination may also be provided as a mandrel bar management apparatus according to claim.
[0015]
Preferably, the mandrel bar management device inputs the mandrel bar temperature when the mandrel bar used for the previous rolling is unloaded from the rolling line, the unloading time, and the mandrel bar to the rolling line to be used for the current rolling. And an initial temperature calculating means for calculating the initial temperature of the mandrel bar to be used for rolling this time.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic configuration diagram showing a mandrel mill system 100 to which a mandrel bar management device 10 according to an embodiment of the present invention is applied. First, a schematic configuration of the entire mandrel mill system 100 will be described with reference to FIG.
[0017]
As shown in FIG. 1, the mandrel mill system 100 includes a mandrel bar management device 10, a bar warehouse 20, a bar carry-in table 30, a bar carry-out table 40, a bar circulation line 50, a mandrel mill 60, a rolling machine. A schedule management means 70 and a rolling schedule information database 80 are provided.
[0018]
The bar warehouse 20 is a space for storing and managing the mandrel bars 200 stored together in each cradle. FIG. 2 shows an example of a storage form using a cradle in a bar warehouse. As shown in FIG. 2, a plurality of cradle 16 are stacked in the vertical direction, and are respectively installed at a predetermined interval in the horizontal direction. Each bar 200 is placed across a plurality of cradle 16 in the horizontal direction, and is carried out by a crane or the like in units of cradle 16 as necessary. Further, the bar 200 that is no longer necessary in the bar circulation line 50 is returned to the bar warehouse 20 in units of the cradle 16.
[0019]
The bar carry-in table 30 is a facility for transporting the mandrel bars 200 in the cradle transported from the bar warehouse 20 by a crane or the like one by one to the bar circulation line 50.
[0020]
The bar carry-out stand 40 is a facility for taking out the mandrel bar 200 that is no longer necessary after rolling in the mandrel mill 60 from the bar circulation line 50 and storing it again in the cradle.
[0021]
The bar circulation line 50 is a facility for supplying the bar 200 tracked one by one by the mandrel bar management means 11 described later to the mandrel mill 60.
[0022]
The rolling schedule management means 70 is a process computer that determines the pipe making order in the mandrel mill 60 based on the rolling schedule in the rolling schedule information database 80. Information on the determined pipe making order is transmitted to the mandrel bar management means 11 of the mandrel bar management apparatus 10 and pipe rolling is performed based on the information.
[0023]
Next, the configuration of the mandrel bar management device 10 will be described. The mandrel bar management device 10 includes a mandrel bar management means 11, a cradle identification detection device 12a and a bar identification detection device 13a installed on the bar carry-in table 30, and a cradle identification detection device 12b and a bar installed on the bar carry-out table 40. An identification detection device 13b, a cradle management information database 14, and a mandrel bar management information database 15 are provided.
[0024]
The cradle identification detection device 12a, after transporting the cradle from the bar warehouse 20 to the bar carry-in table 30, each cradle described later in order to check whether or not the cradle matches the one instructed by the mandrel bar management means 11. Detect the identifier of. Here, as shown in FIG. 4, the cradle 16 for storing the mandrel bar 200 is attached with a cradle identifier 161 for identifying each cradle from others. In the example of FIG. 4, a barcode is used as the cradle identifier 161. In this case, a predetermined barcode reader is used as the identification detection device 12a. When an electromagnetic wave transmitter having a different transmission frequency for each cradle is used as the cradle identifier 161, an electromagnetic wave receiver is used as the identification detection device 12a. In addition, a known identification method such as a mechanical type, an electric type, or an acoustic type can be used, and the configurations of the identification detection device 12a and the identifier 161 are determined according to the method to be employed.
[0025]
The cradle identification detection device 12b has the same configuration as the cradle identification detection device 12a described above, and indicates the cradle identifier stored in the cradle 16 when the bars 200 are unloaded from the bar carry-out base 40 to the cradle 16. 161 is detected. The cradle identifier 161 detected by the present apparatus 12b is used for managing the bar 200 in the bar warehouse 20.
[0026]
The bar identification detection device 13a is used to check whether each bar 200 put into the bar circulation line 50 from the bar carry-in table 30 matches with what the mandrel bar management means 11 has instructed. An identifier of each bar 200 described later is detected. Here, as shown in FIG. 3, the bar identifier 201 is attached to the rear end portion of the mandrel bar 200 in order to identify each bar from others. In the example of FIG. 3, a bar code is used as the bar identifier 201. In this case, a predetermined bar code reader is used as the bar identification detection device 13a. However, the present invention is not limited to this, and it is of course possible to use an electromagnetic identifier and identification detection means as in the case of the cradle 16 described above. Is preferred. In addition, the mechanical, electrical or acoustic identifier and identification detection means can be used as in the case of the cradle 16.
[0027]
The bar identification detection device 13b has the same configuration as the above-described bar identification detection device 13a, and detects the bar identifier 201 of the bar 200 discharged from the bar circulation line 50. The detected bar identifier 201 Is subjected to an inspection as to whether or not it has been tracked and discharged by the mandrel bar management means 11.
[0028]
The mandrel bar management means 11 is a process computer having the following functions (1) to (6). That is,
(1) The cradle 16 in the bar warehouse 20 is managed (placement management, history management of the bar 200 in the cradle 16).
(2) The detection result from the cradle identification detection device 12a is received and inspected whether or not it matches with the designated one, while the detection result from the cradle identification detection device 12b is received and cradle management is performed as described later Link information with mandrel bar management information.
(3) The detection result from the bar identification detection device 13a is received and inspected whether or not it matches with the designated one, while the detection result from the bar identification detection device 13b is received and tracked as described later. Inspect whether it matches the existing bar.
(4) Tracking management of each bar 200 in the bar circulation line 50 is performed.
(5) Cradle management information registered in the cradle management information database 14, mandrel bar management information indicating the information for each bar stored in each cradle 16 and registered in the mandrel bar management information database 15 Tie.
(6) The cradle 16 that matches the pipe making order information is searched from the cradle management information database 14 based on the pipe making order information in the mandrel mill 60 given by the rolling schedule management means 70.
(7) The initial temperature of the bar 200 put into the bar circulation line 50 is calculated.
It is a function.
[0029]
Hereinafter, the association management between the cradle management information and the mandrel bar management information (5) performed by the mandrel bar management means 11 will be described in more detail.
[0030]
FIG. 5 is an explanatory diagram for explaining the association management between the cradle management information and the mandrel bar management information (association management between the cradle identifier and the bar identifier). From the bar warehouse 20 to the bar carry-in stand 30 or from the carry-out stand 40 to the bar warehouse 20 is managed in units of credors 16, and the bar identifier of the bar 200 stored in each credor 16 is It is associated with the cradle identifier of the cradle 16 (in the example shown in FIG. 5, for example, the cradle identifier B and the bar identifiers 00A, 00C, and 00E are associated). Each bar identifier is also associated with unique information (rolling history, bar unloading temperature, etc.) of the mandrel bar 200 identified by the bar identifier.
[0031]
The cradle identifier and the bar identifier are linked when the bar 200 is stored in the bar warehouse 20, that is, when the bar 200 is unloaded from the circulation line 50 and stored in the cradle 16. Further, as described above, the bar identifier 201 and the bar identification detection device 13b, and the cradle identifier 161 and the cradle identification detection device 12b are used for such association. On the other hand, the association is released when the bar 200 is inserted into the bar circulation line 50, and the line 50 is managed for each bar.
[0032]
By performing bar management by such tying, when the mandrel bar 200 is carried in, the bar 200 suitable for the rolled material can be provided to the mandrel mill 60 accurately. Further, in the bar circulation line 50, control based on the bar characteristics for each bar is possible. On the other hand, for the mandrel bars 200 after rolling, a group of mandrel bars gathered for each cradle 16 unit, that is, for each bar outer diameter. Since management is performed in units, efficient bar management can be performed without requiring complicated work and complicated system configuration.
[0033]
Hereinafter, the calculation of the initial temperature of the mandrel bar (7) performed by the mandrel bar management means 11 will be described in more detail.
[0034]
Depending on the rolling schedule, the mandrel bar 200 may be carried in again immediately after being carried out. In such a case, although there is thermal expansion accompanying heat input to the bar 200 due to rolling before unloading, and the outer diameter of the bar 200 varies, conventionally, the initial temperature of the mandrel bar 200 is normal temperature. The setup calculation of the mandrel mill 60 was performed assuming that it was (20 ° C.). Therefore, due to such a setup calculation error, there has been a problem that the dimensional accuracy of the first product after insertion of the bar 200 is poor.
[0035]
In view of such a problem, the mandrel bar management means 11 of the present embodiment has the bar temperature average value (T0) when the mandrel bar 200 used for the previous rolling is unloaded from the bar circulation line 50, and the unloading time (t0). ) And the time difference (Δt) from the charging time (t1) of the mandrel bar 200 used for the current rolling to the charging of the bar 200, the temperature drop amount of the bar 200 is calculated, and the mandrel used for the current bar circulation line 50 is calculated. It is configured to calculate the initial temperature (T1) of the bar 200. An example of the calculation formula is shown in the following formula (1).
T1 = Tr + (T0−Tr) × exp (−αΔt) (1)
Δt = t1-t0
Here, T1: Initial bar temperature (° C.) at this time, α: Adjustment coefficient depending on the bar diameter, Tr: Room temperature (20 ° C.), T0: Average bar temperature value (° C.) at the previous unloading, Δt: Time difference from bar unloading to bar loading (seconds)
The bar temperature average value (T0) is a value calculated by calculation in consideration of heat history such as heating and cooling in the bar circulation line 50. FIG. 9 shows a calculation example of the bar initial temperature (T1) using the above formula (1).
[0036]
As described above, in this embodiment, in order to shorten the calculation time by using a simple method, the bar initial temperature is assumed to be a function of the time difference from bar unloading to bar charging. I decided to calculate. However, the present invention is not limited to this, and a heat transfer model or the like can be used strictly if calculation time is not taken into consideration.
[0037]
Hereinafter, the management method of the mandrel bar 200 by the mandrel bar management apparatus 10 having the above configuration will be described in more detail with reference to FIGS.
[0038]
(1) Registration of mandrel bar and cradle
FIG. 6 is a flowchart showing a procedure for registering the mandrel bar 200 and the cradle 16 to be stored in the bar warehouse 20 and associating the mandrel bar 200 with the cradle 16 storing the mandrel bar 200.
[0039]
As shown in FIG. 6, in this procedure, first, in step 10, the mandrel bar 200 and the cradle 16 are registered. That is, the cradle management information database 14 registers the cradle identifier and the bar diameter and the number of bars 200 stored in each cradle 16 as cradle management information. In the mandrel bar management information database 15, bar identifiers are registered as mandrel bar management information, and unique information (such as α) of each mandrel bar 200 corresponding to the bar identifier is registered as mandrel bar information.
[0040]
Next, each information registered in step 10 is stored in a state in which the cradle identifier and the bar identifier are associated in step 20 (that is, the state in which the cradle management information and the mandrel bar management information are associated). Is done. Furthermore, the bar identifier and the mandrel bar information corresponding to the bar identifier are also stored in a linked state. As described above, FIG. 5 shows the association relationship between such cradle management information, mandrel bar management information, and mandrel bar information.
[0041]
In the linked state, each cradle 16 is stored in the bar warehouse 20. At this time, in step 30, the position of the cradle 16 in the bar warehouse (1-1 etc. in FIG. 5) is set. It is registered and stored in the cradle management information database 14 in a state associated with the cradle identifier.
[0042]
According to the procedure described above, the placement position in the bar warehouse 20 and the cradle 16 and the cradle 16 and the bar 200 stored in the cradle 16 can be made to correspond to each other, and therefore the bar 200 having an outer diameter corresponding to the rolling schedule. When the cradle 16 storing the cradle 16 is unloaded from the bar warehouse 20, the location of the cradle 16 can be specified, and the information on each individual bar 200 in the specified cradle 16 can be grasped. A good mandrel bar 200 can be managed.
[0043]
(2) Deregistration of mandrel bar and cradle
FIG. 7 is a flowchart showing a procedure for canceling registration of the mandrel bar 200 and the cradle 16. As is clear from the structure of the cradle management information, the mandrel bar management information, etc., the registration can be easily canceled by releasing the association between the cradle 16 and the mandrel bar 200. For example, when there is a cradle 16 that stores a defective mandrel bar 200, by specifying the bar identifier of the bar 200 in step 10 of FIG. 7, in step 20, the mandrel bar management information The cradle management information associated with the bar 200 is unlinked, and the cradle 16 cannot be transported. Therefore, the cradle 16 including the abnormal mandrel bar 200 is not erroneously conveyed.
[0044]
(3) Mandrel bar management procedure
Next, the management procedure of the mandrel bar 200 according to the rolling schedule will be described with reference to FIG.
[0045]
First, in step 10 shown in FIG. 8, the rolling schedule management means 70 determines the required bar diameter and number of mandrel bars 200 based on rolling schedule information (outer diameter, thickness, number of pipes to be manufactured, etc.). decide.
[0046]
Next, in step 20, the mandrel bar management means 11 searches based on the cradle management information for the cradle identifier of the cradle 16 storing the mandrel bar 200 matching the determined bar diameter and number, Identify the appropriate cradle identifier. At this stage, the bar warehouse storage location of the cradle 16 to be transported is determined based on the cradle management information.
[0047]
In step 30, an instruction to carry the cradle 16 attached with the cradle identifier 161 specified in step 20 is given, and the cradle 16 is carried from the bar warehouse 20 to the bar carry-in table 30.
[0048]
Next, the cradle identifier 161 of the cradle 16 carried into the carry-in table 30 is read by the cradle identification detection device 12a (step 40), and the mandrel bar management means 11 compares whether or not it is the same as the instruction (step 40). Step 50). As a result of the comparison, if they match, the process proceeds to step 70 described later, and if they are different, the payout of the cradle 16 is instructed (step 60).
[0049]
Next, in the step 50, if it matches the instruction, the bar identifier 201 of each bar 200 stored in the cradle 16 is read one by one by the bar identification detecting device 12a (step 70), and the mandrel bar The management means 11 compares whether or not it is the same as the instruction (step 80). As a result of comparison, if they match, the process proceeds to step 100 to be described later, and if they are different, the payout of the bar 200 is instructed (step 90).
[0050]
Next, in the step 80, if it matches the instructed one, the bar 200 is put into the bar circulation line 50 (step 100). In step 100, the mandrel bar management means 11 searches the above-described mandrel bar information for the inserted bar 200 based on the bar identifier, and then calculates the initial temperature of the bar 200 according to equation (1). To do. When the bar 200 is inserted into the bar circulation line 50, the association between the cradle management information and the mandrel bar management information is released.
[0051]
In step 110, rolling is sequentially performed using the charged mandrel bar 200 in accordance with a rolling schedule. At this time, as the initial temperature of the charged bar 200, the one calculated in step 100 is used, and the mandrel mill 60 is set up. The initial temperature is also used as an initial value for calculating the bar temperature during the bar circulation in the bar circulation line 50.
[0052]
After the number of pipes specified in the rolling schedule is finished, the bars 200 are carried out. At this time, the bar identifiers 201 are read one by one by the bar identification detection device 13b (step 120), and the mandrel bar management means 11 Are the same as those being tracked (step 130). As a result of comparison, if the bar 200 carried out from the circulation line 50 matches the bar 200 being tracked, the process proceeds to step 150 to be described later, and if different, the bar 200 is paid out as an abnormal bar. Instruct (step 140).
[0053]
Next, in the step 130, when it matches with what is being tracked, the mandrel bar 200 to be carried out is stored again in the cradle 16 and returned to the bar warehouse 20, but at that time, it is going to be stored. The cradle identifier 161 of the cradle 16 to be read is read by the cradle identification detection device 12b (step 150), and the mandrel bar management means 11 associates the read cradle identifier with the bar identifier again (step 160).
[0054]
Finally, in step 170, an instruction is given to transport the bar 200 stored in the cradle 16 to the bar warehouse 20 by means such as a crane. After the transportation, when the placement position of the cradle 16 in the bar warehouse 20 is confirmed, the placement position in the warehouse is registered in the cradle management information described above and is stored in the bar warehouse 20 until it is used again.
[0055]
【The invention's effect】
As described above, according to the mandrel bar management method according to the present invention, from the bar warehouse to the transfer to the rolling line (including storage in the bar warehouse), not the management of each mandrel bar, Based on the second identification means, it is possible to manage a mandrel bar group in which a plurality of mandrel bars are collected. On the rolling line, it is possible to manage each mandrel bar on the basis of the first identification means. it can. Therefore, compared to the case where management is performed for each mandrel bar in all steps, it is possible to perform efficient bar management without requiring complicated work and complicated system configuration.
[0056]
In addition, since the second identification means is used to check whether or not the mandrel bar group arriving at the rolling line conforms to a predetermined rolling schedule, it is first prevented that an incorrect mandrel bar group is carried into the rolling line. it can. Furthermore, even if the mandrel bar group is adapted to the rolling schedule, it may be considered that each mandrel bar constituting the mandrel bar group is incompatible, but according to the present invention, the mandrel bar group is determined in advance. Inspecting whether or not it is a mandrel bar based on the first identification means, it is possible to surely prevent the introduction of a non-conforming bar into the rolling line and to avoid a rolling trouble. It is.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a mandrel mill system to which a mandrel bar management device according to an embodiment of the present invention is applied.
FIG. 2 is a perspective view showing an example of a storage form using a cradle in a bar warehouse.
FIG. 3 is a schematic configuration diagram showing a mandrel bar to which a bar identifier is attached.
4 shows a schematic configuration of a cradle in a state where a mandrel bar is placed, (a) is a front view, and (b) is a side view. FIG.
FIG. 5 is an explanatory diagram for explaining association management between cradle management information and mandrel bar management information;
FIG. 6 is a flowchart showing a procedure for registering a mandrel bar and a cradle to be stored in the bar warehouse and associating the mandrel bar with a cradle for storing the mandrel bar.
FIG. 7 is a flowchart showing a procedure for canceling registration of a mandrel bar and a cradle.
FIG. 8 is a flowchart showing a mandrel bar management procedure in accordance with a rolling schedule;
FIG. 9 is a graph showing a calculation example of the bar initial temperature.
[Explanation of symbols]
10 ... Mandrel bar management device
11 ・ ・ ・ Mandrel bar management means
12a, 12b ... Cradle identification detection device
13a, 13b ... Bar identification detection device
16 ... Cradle
20 ・ ・ ・ Bar warehouse
50 ・ ・ ・ Versation line
60 ・ ・ ・ Mandrel mill
70 ... rolling schedule management means
100 ... Mandrel mill system
161... Cradle identifier
200 ... Mandrel bar
201 ・ ・ ・ Bar identifier

Claims (4)

A method for managing a mandrel bar used for seamless steel pipe manufacturing, in order to identify a mandrel bar individual, a first identification means is associated with each mandrel bar,
According to the rolling schedule, in order to identify each mandrel bar group consisting of a plurality of mandrel bars conveyed together from the bar warehouse to the rolling line, a second identification means is associated with each mandrel bar group,
When the mandrel bar group arrives at the rolling line,
Inspecting whether or not the mandrel bar group conforms to a predetermined rolling schedule based on the second identification means,
Subsequently, the mandrel bar management method, wherein each mandrel bar constituting the mandrel bar group is inspected based on the first identification means to determine whether or not each mandrel bar group is a mandrel bar predetermined for the mandrel bar group. . The temperature of the mandrel bar when the mandrel bar used for the previous rolling was unloaded from the rolling line,
Said unloading time;
2. The mandrel bar management method according to claim 1, wherein an initial temperature of the mandrel bar used for the current rolling is calculated based on a time when the mandrel bar is put into a rolling line to be used for the current rolling. A mandrel bar management device used for seamless steel pipe manufacturing, comprising: a first identification means for identifying a mandrel bar individual;
A transport support means for transporting and supporting a group of mandrel bars composed of a plurality of mandrel bars from a bar warehouse to a rolling line according to a rolling schedule,
A second identification means provided on the transport support means for identifying one transport support means from other transport support means;
When the transport support means arrives at the rolling line, it is inspected based on the second identification means whether the transport support means conforms to a predetermined rolling schedule, and the mandrel supported by the transport support means. A mandrel bar management apparatus comprising: an inspection unit that inspects whether each mandrel bar constituting the bar group is a mandrel bar predetermined for the mandrel bar group based on the first identification unit. . The temperature of the mandrel bar when the mandrel bar used for the previous rolling was unloaded from the rolling line,
Said unloading time;
The mandrel bar management according to claim 3, further comprising initial temperature calculation means for calculating an initial temperature of the mandrel bar to be used for current rolling depending on a time when the mandrel bar is put into a rolling line to be used for current rolling. apparatus.

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