JP2020065958A - Painted metal strip manufacturing method and equipment - Google Patents

Abstract

To provide a painted metal strip manufacturing method and equipment by which a standby time from re-utilization of painted metal strip manufacturing equipment to start of product material processing can be shortened, and a producibility of a painted metal strip can be improved.SOLUTION: Painted metal strip manufacturing method and equipment includes: a process (step S3) in which a tip of a product material is welded to a tail end of a rubbing strip transported on a continuous painting line by a welder 102, thereby forming a welded point; and a process (step S4) in which in the state that the welded point is transported to a downstream side with respect to the welder 102 after the welded point has been formed, transportation of the welded point is stopped.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method and an equipment for producing a coated metal strip for producing a coated metal strip.

  Examples of the conventionally used manufacturing method and equipment for this type of coated metal strip include the structure disclosed in Patent Document 1 below. That is, in the conventional configuration, the thread material (dummy material) is passed through the manufacturing equipment when the equipment for manufacturing the coated metal strip is stopped, and the tip of the product material is welded to the tail end of the thread material by the welder. . After the tip of the product material is welded to the tail end of the thread material by the welder, the welding point between the thread material and the product material is stopped at the position of the welder. This is so that if the production schedule is changed during the suspension and the product material has to be replaced, it is possible to immediately respond. When the production equipment for the coated metal strip is restarted, the product material is introduced into the production equipment by flowing the thread material.

JP, 2017-30021, A

  In the conventional configuration as described above, since the welding point of the thread material and the product material is stopped at the position of the welder, waiting from the time when the coated metal strip manufacturing facility is restarted until the processing of the product material is started. The time is getting longer and the efficiency of manufacturing coated metal strips is getting worse. In the case of a coated metal strip manufacturing facility, there may be more than 100 pauses per month due to changes in the paint. Even if the waiting time is slightly increased, the manufacturing efficiency is greatly deteriorated.

  The present invention has been made to solve the above problems, and its purpose is to set a standby time from the time when the manufacturing equipment of the coated metal strip is restarted until the processing of the product material is started. It is an object of the present invention to provide a manufacturing method and equipment for a coated metal strip which can be shortened and can improve the production efficiency of the coated metal strip.

  The method for manufacturing a coated metal strip according to the present invention, a step of creating a welding point by welding the tip of a product material to a tail end of a thread material conveyed through a continuous coating line with a welder, and after creating a welding point, A step of suspending the transportation of the welding point in a state where the welding point is transported downstream of the welder.

  Manufacturing equipment of the coated metal strip according to the present invention, a welder that welds the tip of the product material to the tail end of the thread material to create a welding point, and after the welding point is created, the welding point is located downstream of the welder. And a controller that suspends the transfer of the welding point in the transferred state.

  According to the method and the equipment for producing a coated metal strip of the present invention, after welding the tip of the metal strip to the tail end of the thread material to create a welding point, the welding point is conveyed downstream of the welder, and welding is performed. Since the point transportation is stopped, the waiting time from the restart of the coated metal strip manufacturing facility to the start of the processing of the product material can be shortened, and the coated metal strip manufacturing efficiency can be improved.

It is a block diagram which shows the manufacturing equipment of the coated metal strip in which the manufacturing method of the coated metal strip by embodiment of this invention is implemented. 6 is a flowchart showing a pause control operation by the control device of FIG. 1.

  Hereinafter, modes for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to each embodiment, and constituent elements can be modified and embodied without departing from the scope of the invention. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in each embodiment. For example, some constituent elements may be deleted from all the constituent elements described in the embodiments. Furthermore, the constituent elements of different embodiments may be combined appropriately.

  FIG. 1 is a configuration diagram showing a coated metal strip manufacturing facility in which a method for manufacturing a coated metal strip according to an embodiment of the present invention is implemented. As shown in FIG. 1, the coated metal strip manufacturing facility of the present embodiment is provided with an inlet side section 1, a central section 2, an outlet side section 3 and a controller 4.

  The entry side section 1 is a section for paying out the metal strip 5 from the payoff reels 100 and 101. The central section 2 is provided in the subsequent stage of the entrance side section 1 and is a section for performing coating and baking after subjecting the metal strip 5 to chemical conversion treatment. The exit side section 3 is a section that is provided in the latter stage of the central section 2 and winds the coated metal strip 5 on the tension reel 302. The inlet side section 1, the central section 2 and the outlet side section 3 constitute a continuous coating line through which the metal strip 5 is conveyed. Hereinafter, the entrance side section 1, the central section 2 and the exit side section 3 will be described more specifically.

<Incoming section>
The entry side section 1 is provided with first and second payoff reels 100, 101, a welder 102, and an entry side looper 103.

  A metal strip coil around which the metal strip 5 is wound is inserted into each of the first and second payoff reels 100 and 101. The insertion of the metal strip coils into the first and second payoff reels 100 and 101 is performed by a coil car (not shown). The coil car is for horizontally transporting and lifting the metal strip coil. Although not shown in the drawing, an indexing device for scooping the tips of the metal strip coils inserted in the first and second payoff reels 100 and 101 is provided near the first and second payoff reels 100 and 101. .

  The metal strip 5 contains a product material and a thread material. The product material is a metal strip on which coating or the like is performed as a product. The thread material is a metal strip that is passed through a continuous coating line when the production facility for the coated metal strip is stopped. The thread material is sometimes called a dummy material.

  The welder 102 is a welding machine that welds the tail end of the preceding metal strip to the tip of the succeeding metal strip. Welding by the welder 102 includes welding of product materials, welding of thread materials, welding of the tip of thread material to the tail end of the product material, and welding of the tip of product material to the tail end of the thread material. . By performing such welding, the metal strip 5 is continuously conveyed in the continuous coating line. The welds between the metal strips are called weld points. When welding of the metal strip 5 is performed by the welder 102, the transport of the metal strip 5 is stopped in the welder 102.

  The entrance looper 103 is a device that adjusts the transport length of the metal strip 5. The entry looper 103 includes a plurality of fixed rolls 103a and a plurality of movable rolls 103b arranged above the fixed rolls 103a. The metal strips 5 are alternately wound around the fixed roll 103a and the movable roll 103b.

  Each movable roll 103b is provided so as to be vertically displaceable. The transport length of the metal strip 5 is shortened by lowering each movable roll 103b toward the fixed roll 103a, and the transport length of the metal strip 5 is lifted by each movable roll 103b moving away from the fixed roll 103a. Will be lengthened. By adjusting the transport length by the entry looper 103, it is possible to maintain the supply of the metal strip 5 to the subsequent stage of the entry looper 103 even when the metal strip 5 is welded by the welder 102. To be done. That is, before the welding of the metal strip 5 by the welder 102 is performed, the movable rolls 103b are raised to store the metal strip 5 in the entry side looper 103, and the welding of the metal strip 5 by the welder 102 is performed. At this time, by lowering each movable roll 103b and sending out the metal strip 5 from the entry side looper 103, even when the metal strip 5 is being welded by the welder 102, the metal strip to the subsequent stage of the entry side looper 103 is reduced. A supply of 5 can be maintained.

<Center section>
In the central section 2, the pre-coating equipment 200, the Chemi coater 201, the drying oven 202, the first coater 203, the first oven 204, the first water quench 205, the second coater 206, the second oven 207, the second water quench 208. And a tension leveler 209 are included.

  The pre-painting treatment facility 200 is a facility for pre-treating the metal strip 5. In the pre-painting treatment facility 200 of the present embodiment, the metal strip 5 is subjected to alkali degreasing, the metal strip 5 is washed with water, and then the phosphate treatment is performed on the metal strip 5.

  The chemico coater 201 is a facility that applies a chemical conversion treatment solution to the metal strip 5 that has been subjected to the pre-coating treatment in the coating pre-treatment facility 200 to apply the chemical conversion treatment to the metal strip 5.

  The drying furnace 202 is a furnace for drying the metal strip 5 in the latter stage of the chemicoater 201.

  The first coater 203 is equipment for applying an undercoat to the metal strip 5. The first oven 204 and the first water quench 205 are equipments for baking and cooling the coating film of the metal strip 5 undercoated by the first coater 203.

  The second coater 206 is a facility for overcoating the metal strip 5. The second oven 207 and the second water quench 208 are equipments for baking and cooling the coating film of the metal strip 5 coated by the second coater 206.

  The tension leveler 209 is a device that stretches the metal strip 5 after painting and baking to correct the shape.

<Outgoing section>
The exit side section 3 is provided with an exit looper 300, an exit shear 301, and a tension reel 302.

  The exit-side looper 300 is a device that adjusts the transport length of the metal strip 5 similarly to the entrance-side looper 103. By adjusting the transport length by the exit side looper 300, the metal band 5 can be accumulated in the exit side looper 300 when the metal band 5 is cut by the exit shear 301, which will be described later.

  The exit shear 301 is arranged in the latter stage of the exit side looper 300 and is a device for cutting the metal strip 5 into a predetermined length. When the metal strip 5 is cut by the exit shear 301, the transport of the metal strip 5 is stopped at the exit shear 301.

  The tension reel 302 is arranged in the latter stage of the exit shear 301, and is a reel body that winds the metal strip 5 that has passed through the exit shear 301 into a coil shape. When a certain amount of the metal strip 5 is wound around the tension reel 302, the metal strip 5 is cut by the exit shear 301. Extraction and transportation of the metal strip coil from the tension reel 302 is performed by a coil car (not shown).

  The control device 4 is composed of, for example, a computer that performs arithmetic processing based on a program. The control device 4 controls the operation of the devices included in the input side section 1, the central section 2 and the output side section 3. The control device 4 also controls the transportation of the metal strip 5.

  As described above, when the coated metal strip manufacturing facility is shut down, the thread material is passed through the continuous coating line. The thread material is welded to the tail end of the product material that is being passed through the continuous coating line before the production facility for the coated metal strip is stopped, and the continuous coating line is flowed together with the product material so that the continuous coating line Passed through. The product material in which the thread material is welded to the tail end is called the first product material. The next product material is welded to the tail end of the thread material in preparation for the restart of the equipment for producing the painted metal strip. The next product material is passed through the continuous coating line by flowing through the continuous coating line together with the thread material. The product material welded to the tail end of the thread material is called the second product material.

  As will be described below, the control device 4 of the present embodiment performs a control operation for shortening the waiting time from the time when the coated metal strip manufacturing facility is restarted until the processing of the product material is started. . It should be noted that the production of the coated metal strip is stopped during, for example, at least one of the coating change when the coating used in the first or second coater 203 or 206 is changed and the test coating for trial coating the product material. Be implemented. The metal strip used during the test coating is sometimes called a test material. The product material of the present specification also includes a test material used for test painting.

  Next, FIG. 2 is a flowchart showing a pause control operation by the control device 4 of FIG. The control device 4 performs the pause control operation shown in FIG. 2 when receiving a pause command from the outside. The pause command is input to the control device 4 from an input unit such as a control panel operated by an operator. As shown in FIG. 2, when starting the pause control operation, the control device 4 welds the tip of the thread material to the tail end of the first product material by the welder 102 to create a first welding point (step S1). Then, the control device 4 passes the thread material through the continuous coating line (step S2), and welds the tip of the second product material to the tail end of the thread material by the welder 102 to create a second welding point ( Step S3).

  After creating the second welding point, the control device 4 carries the second welding point (step S4), and suspends the carrying of the welding point with the second welding point carried downstream of the welder 102 ( Step S5). As described above, by stopping the conveyance of the welding point in the state where the second welding point is conveyed downstream of the welder 102, as compared with the case where the second welding point is kept at the position of the welder 102, The waiting time from when the manufacturing equipment is restarted until the processing of the product material is started can be shortened, and the manufacturing efficiency of the coated metal strip can be improved.

  The control device 4 suspends the transportation of the second welding point in a state where the second welding point is located upstream of the pre-painting treatment facility 200. Since the second welding point is located upstream of the coating pretreatment facility 200, the pretreatment of the second product material can be performed for an appropriate time when the coated metal strip manufacturing facility is restarted.

  The control device 4 has information indicating the transport speed at which the second welding point (second metal strip) should be transported when the coated metal strip manufacturing facility is restarted. After restarting the transportation of the second welding point, the control device 4 restarts the transportation of the second welding point so that the time from when the transportation of the second welding point is restarted to when the second welding point reaches the first oven 204 is a predetermined time or more. The position of the second welding point when the transportation of the second welding point is stopped is changed according to the transportation speed of the second welding point. In this way, by changing the position of the second welding point when the conveyance of the second welding point is stopped, the second product material enters the first oven 204 after the in-furnace conditions of the first oven 204 have been adjusted. Therefore, the second product material can be coated more appropriately.

  The control device 4 of the present embodiment suspends the transportation of the second welding point in a state where the second welding point is transported to the downstream side of the entrance looper 103. The control device 4 stores the second product material in the entry side looper 103 after stopping the transportation of the second welding point (step S6). That is, while feeding the second product material from the first or second payoff reels 100 and 101, the movable roll 103b of the entrance looper 103 is raised to store the second product material in the entrance looper 103. At this time, the second product material is preferably stored at 60% or more of the predetermined maximum storage amount of the metal strip in the entrance looper 103, more preferably at 80% or more, and even 100%. More preferable. The second product material is stored in the entry side looper 103 before the transportation of the second welding point is restarted, so that the second product material can be processed earlier after the manufacturing equipment for the coated metal strip is restarted. can do.

  After storing the second welding point in the entry looper 103, the control device 4 restarts the conveyance of the second welding point when a restart command from the outside is detected (step S7). The transportation of the second welding point is preferably restarted after the second metal strip is stored in the entrance looper 103 up to a predetermined storage amount, but it may be predetermined depending on the timing at which the coated metal strip manufacturing facility is restarted. The storage may be resumed before the second product material is stored in the entry looper 103.

In the method for manufacturing a coated metal strip according to the present embodiment, a step of welding the tip of the second product material to the tail end of the thread material conveyed through the continuous coating line by the welder 102 to create a second welding point (step S3). ) And a step of suspending the transportation of the second welding point in a state where the second welding point is transported downstream of the welder 102 after the second welding point is created (step S4).
In addition, in the method for manufacturing the coated metal strip according to the present embodiment, the second product material is stored in the entry side looper 103 after the second welding point is created and before the conveyance of the second welding point is restarted. The process (step S6) is further included.
Furthermore, in the method for manufacturing a coated metal strip according to the present embodiment, the transfer of the second welding point is stopped in the state where the second welding point is located upstream of the coating pretreatment facility 200.
Furthermore, in the method for manufacturing a coated metal strip according to the present embodiment, the second welding is performed so that the time from when the welding point is resumed to when the welding point reaches the first oven 204 is a predetermined time or more. The position of the second welding point when the transportation of the second welding point is stopped is changed according to the transportation speed of the second welding point after the point transportation is restarted.
In addition, the suspension of the transportation of the second welding point is performed at the time of changing the paint and at the time of test painting.

  In such a method and equipment for manufacturing a coated metal strip, a step of welding the tip of the second product material to the tail end of the thread material conveyed through the continuous coating line by the welder 102 to create the second welding point (step S3). ) And a step of suspending the transportation of the second welding point (step S5) after the second welding point is created and the second welding point is transported downstream of the welder 102. It is possible to shorten the waiting time from the restart of the manufacturing equipment of the above until the processing of the product material is started, and it is possible to improve the manufacturing efficiency of the coated metal strip. In the case of a coated metal strip manufacturing facility, there may be a pause of more than 100 times a month. By reducing the waiting time, the manufacturing efficiency can be greatly improved.

  In addition, since the second product material can be stored in the entry side looper 103 after the second welding point is created and before the second welding point is resumed, after the second welding point is resumed. The treatment of the second product material can be carried out earlier.

  Furthermore, since the second welding point is stopped in a state in which the second welding point is located upstream of the coating pretreatment facility 200, the second product is removed when the coated metal strip manufacturing facility is restarted. The pretreatment of the material can be done for a suitable time.

  Furthermore, the second welding point after restarting the transportation of the second welding point is set such that the time from the restart of the transportation of the welding point to the arrival of the welding point in the first oven 204 is a predetermined time or more. Since the position of the second welding point when the transportation of the second welding point is stopped is changed according to the transportation speed, the second product material is transferred to the first oven 204 after the inside condition of the first oven 204 is adjusted. The second product material can be applied more appropriately.

  Further, since the transfer of the second welding point is stopped at the time of changing the coating material and at the time of test coating, the waiting time after changing the coating material and at the time of test coating can be shortened and the production efficiency of the coated metal strip can be improved.

4 Control device 5 Metal strip (thread material, product material)
102 Welder 103 Entry side looper (looper)
200 Coating pretreatment equipment 203 First coater (painting equipment, coater)
204 1st oven (painting equipment, oven)

Claims (6)

A process of welding the tip of the product material to the tail end of the thread material conveyed through the continuous coating line with a welder to create a welding point,
A step of suspending the transportation of the welding point in a state in which the welding point is transported downstream of the welder after the welding point is created. The continuous coating line includes a coating pretreatment facility disposed downstream of the welder, and a coating facility disposed downstream of the coating pretreatment facility,
In a state in which the welding point is located upstream of the coating pretreatment facility, the conveyance of the welding point is stopped.
The method for producing a coated metal strip according to claim 1. The continuous coating line includes a looper arranged downstream of the welder,
The manufacturing of the coated metal strip according to claim 1 or 2, further comprising a step of storing the product material in the looper after creating the welding point and before restarting the transportation of the welding point. Method. The continuous coating line includes a coating pretreatment facility disposed downstream of the welder, and a coating facility disposed downstream of the coating pretreatment facility,
The coating facility includes a coater for coating the product material, and an oven arranged downstream of the coater,
According to the transport speed of the welding point after the transport of the welding point is restarted, so that the time from when the transport of the welding point is restarted until the welding point reaches the oven becomes a predetermined time or more. The position of the welding point is changed when the transportation of the welding point is stopped,
The method for manufacturing a coated metal strip according to any one of claims 1 to 3. The suspension of the welding point transfer is performed at the time of changing the paint and the test painting,
The method for producing a coated metal strip according to any one of claims 1 to 4. Welder that creates a welding point by welding the tip of the product material to the tail end of the thread material,
A controller for suspending the transportation of the welding point in a state in which the welding point is transported downstream from the welder after the welding point is created, and a coated metal strip manufacturing facility.

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