JP2007245222A - Pretreating equipment for working metal sheet and equipment for working metal sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide equipment which is high in productivity, with which a series of treatments including heating treatment before hot-working following the forming of an oxidation preventing film after forming an oxidation preventing film by applying chemical to the surface of a metal sheet. <P>SOLUTION: The metal sheet 100a just after drying a coated film by a hot wind in a drying room 5 when forming the oxidation preventing film is put into a preheating room 6 of the working. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a metal plate processing pretreatment facility and a metal plate processing facility, and in particular, a facility used when performing a process of heating a metal plate as a pre-stage of hot working and a metal plate using the same. The present invention relates to a processing facility for a metal plate to be processed.

As a typical example of a metal plate, in the case of a steel plate as an example, hot working of a steel plate is performed by heating a low strength steel plate at a mild steel level to a temperature equal to or higher than the _AC3 transformation point and then rapidly cooling it. As a method for obtaining a high-strength product exceeding the tensile strength of 1000 MPa by quenching, application to the molding of structural parts for automobile bodies is being attempted. In this method, since heating exceeding 900 ° C. is performed, a film called oxide scale is formed on the surface of the steel sheet.

However, prior to this hot working, in order to improve the formability during the hot working, it is actually necessary to perform a process of heating the steel sheet to around 1000 ° C., and the higher the heating temperature, A larger amount of oxide scale is formed on the surface.
Part of the oxide scale breaks due to the plastic deformation of the steel sheet during hot working and peels off from the surface of the steel sheet and scatters around the processing equipment. In some cases, the mold may be damaged or the product may be defective as a result of peeling off and some of the steel plate being hot-worked and the metal mold for processing. There is also. Further, if the oxide scale remains in the product, the weldability and chemical conversion processability are deteriorated, so that it is necessary to peel and remove the oxide scale by shot blasting or the like.

  As a method for preventing the formation of oxide scale, 1) a method of adjusting the components of the steel plate to a composition in which an oxide film is difficult to form, 2) a method of forming an aluminum-based plating film on the surface of the steel plate, and 3) on the surface of the steel plate Examples thereof include a method of forming an antioxidant film by applying a chemical, 4) heating before processing the steel plate, and a method of making the atmosphere when hot working the steel plate a non-oxidizing atmosphere.

Patent Document 1 listed below describes a sheet metal processing apparatus characterized in that a heating apparatus and a processing apparatus are provided in a space capable of forming a non-oxidizing atmosphere as an apparatus capable of performing the above 4). ing.
Examples of the method 1) include the method described in Non-Patent Document 1 below.
Examples of the method 2) include the method described in Patent Document 2 below.
Examples of the method 3) include the methods described in Patent Documents 3 and 4 below.

JP 2004-106034 A JP 2000-38640 A JP-A-7-62429 Japanese Patent Laid-Open No. 11-12666 Miyazaki, Hirasawa, Furu, "Stainless steel for non-exhaust parts-Ferritic stainless steel for exhaust manifold" JFE-MH1 "with excellent heat resistance and workability", May 2004, JFE Technical Report No. 4, p53- 57

Among the methods 1) to 4) described above, the methods 1) and 2) require a steel plate to have a special composition, so that the cost is high and the hot workability is reduced due to the special composition. There is also a risk of doing so. The method 4) requires a large atmosphere adjustment in a range including the processing apparatus and its surroundings, so that the equipment cost increases accordingly. The method of 3) can prevent the formation of oxide scale regardless of the steel type by selecting and applying a chemical suitable for the steel type, and there is no possibility that the hot workability is lowered. There is room for improvement in terms of productivity in the flow of a series of processes including heat treatment before hot working.
An object of the present invention is to provide a highly productive facility that can efficiently perform a series of processes including a heat treatment before hot working after forming an antioxidant film by applying a chemical on the surface of a metal plate. Is to provide.

In order to solve the above-described problems, the pre-processing equipment for hot working metal plate according to the present invention comprises a film forming equipment for forming an antioxidant film by applying a chemical on the surface of the metal plate, and the metal plate. The heating equipment for heating is arranged continuously.
By using the metal plate pre-processing equipment of the present invention, an anti-oxidation film can be formed on the surface of the metal plate and immediately followed by heat treatment before hot working of the metal plate. This method is more productive than a method in which an anti-oxidation film is formed on the surface of the metal plate and immediately followed by heat treatment prior to hot working of the metal plate. .

  In the pre-processing equipment for processing a metal plate of the present invention, the film forming equipment is a coating chamber for applying a film forming liquid to the metal plate, and drying for heating and evaporating the solvent from the coating film formed on the metal plate. When the chamber is provided, the heat energy stored in the metal plate heated by the drying process can be directly brought into a heating facility for performing the heating process. Thereby, the time concerning the heat processing before the hot processing of the metal plate in the heating facility can be shortened, and the energy cost can also be reduced.

  When the film-forming liquid is a chemical in which a film-forming component is mixed in an organic or inorganic solvent, the drying chamber has a concentration detecting means for detecting the concentration of the solvent vapor evaporated from the solvent, and an exhaust It is preferable to include a duct and opening degree adjusting means for adjusting the opening degree of the exhaust duct based on the concentration of the solvent vapor detected by the concentration detecting means. Then, by this opening degree adjusting means, the opening degree of the exhaust duct is increased in the early stage of the drying process in which the concentration of the solvent vapor is high, and is decreased in the later stage of the drying process in which the concentration of the solvent vapor is decreased. In the early stage of treatment, for example, when using an organic solvent with flammability, the decrease in the atmosphere concentration becomes faster, so safety can be secured more, and the exhaust amount is reduced later in the drying process. , The loss of heat energy is suppressed.

  When the film-forming liquid is a drug in which a film-forming component is mixed in a solvent, the drying chamber is detected by the temperature detecting means for detecting the temperature of the metal plate, the exhaust duct, and the temperature detecting means. It is preferable to provide an opening degree adjusting means for adjusting the opening degree of the exhaust duct based on the temperature of the metal plate. And by this opening degree adjusting means, at the beginning of the drying process where the temperature of the metal plate is low, the opening degree of the exhaust duct is increased to quickly remove the main solvent such as water or water-soluble organic solvent vapor. For example, when the temperature of the metal plate at the later stage of the drying process rises above the azeotropic point of the paint solvent system, the opening of the duct is reduced to minimize the loss of heat energy due to exhaust. Is possible.

The present invention also provides a metal plate processing facility provided with a pre-processing facility for processing a metal plate of the present invention in the previous stage.
As a film forming method for forming an antioxidant film by applying a chemical on the surface of the metal plate in the pre-processing facility for processing the metal plate of the present invention, conventionally known methods can be applied.
This method can be roughly divided into two types according to the film formation principle. One is that the film forming component dispersed in the solvent is formed by drying and solidifying mainly by evaporation of the solvent. The other is that a component in the coating material undergoes a chemical reaction such as addition, condensation, or substitution by heating in a drying process to form a crosslinked structure to form a film.

  Also, depending on the type of solvent, solvent-based paints mainly composed of organic solvents such as xylene, toluene, butanol, cellosolve solvents (butoxyethanol, etc.), and aqueous solvents such as alcohols with water as the main component were added. Although it can be roughly classified into two types of water-based paints, there is no problem in applying the metal plate of the present invention to the pre-processing equipment for processing, regardless of the combination of either type.

  According to the metal plate pre-processing equipment of the present invention, after forming an antioxidant film by applying a chemical on the surface of the metal plate, a series of processing including the heat treatment before hot working is efficiently performed. It is possible to provide highly productive equipment that can be performed well.

Hereinafter, one embodiment of the present invention will be described.
FIG. 1 is a schematic configuration diagram showing a metal plate processing facility in this embodiment. This metal plate processing equipment is composed of a metal plate pre-processing equipment 1 and a hot processing equipment 2 provided at the preceding stage.
The metal plate pre-processing equipment 1 includes a coating chamber 3 for applying a film-forming liquid to the metal plate, a drying chamber 5 for heating and evaporating the solvent from the coating film formed on the metal plate, and a space between them. And a pre-processing heating chamber (heating equipment) 6 for heating the metal plate.

The coating chamber 3 and the intermediate chamber 4 are separated by a door 34. The intermediate chamber 4 and the drying chamber 5 are separated by a door 45. The drying chamber 5 and the pre-processing heating chamber 6 are continuously arranged in an integrated furnace 65 and separated by a door 56. These doors 34, 45, 56 and the door 67 at the outlet of the pre-processing heating chamber 6 are automatically opened and closed by a signal from the door opening / closing control device 7.
The coating chamber 3 is provided with a nozzle 31 that sprays a liquid for forming a film from above and below the metal plate. An exhaust duct 32 is installed on the ceiling of the coating chamber 3. An exhaust duct 42 is also installed on the ceiling of the intermediate chamber 4, and these exhaust ducts 32 and 42 are connected to a pipe 81 provided with an exhaust fan 8.

The drying chamber 5 is a hot air circulation furnace that heats the metal plate 100 by circulating hot air. An air supply duct 52 and an exhaust duct 53 are installed on the ceiling of the drying chamber 5. The exhaust duct 53 is connected to a pipe 82 provided with the exhaust fan 8.
The metal plate processing facility in this embodiment is a facility that corresponds to a case where a chemical in which a film forming component is mixed in an organic solvent is used as a liquid for forming a film. For this reason, a gas concentration detection sensor 51 for detecting the concentration of the solvent vapor obtained by vaporizing the solvent is installed near the ceiling in the drying chamber 5. The exhaust duct 53 is provided with a damper (opening adjusting means) 53a. Further, a damper adjusting device (opening adjusting means) 9 for adjusting the opening of the damper 53a based on the concentration of the solvent vapor detected by the gas concentration detection sensor 51 is provided.
In the metal plate processing facility in this embodiment, the coating chamber 3, the intermediate chamber 4, the drying chamber 5, and the devices and pipes installed in these chambers form a film in the metal plate pre-processing facility 1. Configure equipment.

The metal plate processing facility in this embodiment operates as follows.
When the metal plate 100 that has been wound in a coil shape is unwound and cut, or is formed into a plate shape through a process such as blanking, the drug is first introduced from the nozzle 31 into the coating chamber 3. After blowing for a certain period of time, the door 34 is opened by a signal from the door opening / closing control device 7, and the metal plate 100 is moved to the intermediate chamber 4. The metal plate may be moved manually or automatically by an actuator (not shown). Next, after the door 34 is closed, the door 45 is opened, and the metal plate 100 is moved to the drying chamber 5. In the drying chamber 5, the metal plate 100 is heated to 100 to 300 ° C.

During this heating, the concentration of the solvent vapor in which the solvent of the used medicine is vaporized is detected by a gas concentration detection sensor (concentration detecting means) 51, and a signal S ₁ indicating the detected concentration of the solvent vapor is a damper. It is sent to an opening adjustment device (opening adjustment means) 9. Based on this signal S ₁ , the damper opening adjustment device 9 drives the damper opening / closing actuator corresponding to the opening setting value for adjusting to the desired opening to adjust the opening of the damper 53a. the signal S ₂ indicating the outputs to the drive circuit of the damper 53a. The drive circuit by adjusting the opening of only the damper 53a amount corresponding to the drive amount indicated by the signal S _2, the opening degree of the exhaust duct 53 is adjusted.

  The adjustment of the opening degree of the exhaust duct 53 by the damper opening degree adjusting device 9 and the damper 53a is performed by exhausting the drying chamber 5 at the initial stage of the drying process in which a large amount of solvent evaporates and the concentration of the solvent vapor in the atmosphere increases. In the latter stage of the drying process in which the exhaust amount from the duct 53 increases and the concentration decreases, the exhaust amount is decreased. Thereby, at the initial stage of the drying process, if an organic solvent having flammability is used, for example, the decrease in the atmospheric concentration is accelerated, so that safety can be ensured. Further, in the latter stage of the drying process, the amount of exhaust is reduced, so that loss of heat energy is suppressed.

  Next, when drying is completed, the door 56 opens, the metal plate 100a on which the anti-oxidation film is formed enters the pre-processing heating chamber 6, and after the door 56 is closed, heating before hot processing at around 1000 ° C. Processing is performed. Next, after a certain period of time has elapsed, the door 67 is opened, and the metal plate 100 is taken out of the pretreatment facility 1 for processing the metal plate. Then, the metal plate 101 that has been subjected to the heat treatment before hot working is press-formed by the hot working equipment 2 to obtain a product 102 having a desired shape.

  According to the metal plate processing facility in this embodiment, the anti-oxidation film can be formed on the surface of the metal plate, and the heat treatment before hot working of the metal plate can be performed immediately, so that the productivity is high. . In addition, since the metal plate 100a immediately after drying the coating film with hot air enters the pre-processing heating chamber 6 in the drying chamber 5 when forming the antioxidant coating, the thermal energy stored in the metal plate 100a during processing is processed. By bringing it into the preheating chamber 6 as it is, the time required for the heat treatment before hot working can be shortened, and the energy cost can be reduced.

In addition, since the chemical agent for forming the anti-oxidation film is applied by a spray method in which the metal plate 100 is sprayed from above and below, the equipment cost is also higher than the method of applying with various coaters and the method of electrostatic application. cheap.
The metal plate processing equipment in this embodiment corresponds to the case where a chemical in which a film forming component is mixed in an organic solvent is used as the film forming liquid, but the present invention is not limited to this. Alternatively, a chemical in which a film forming component is mixed in an inorganic solvent or water may be used.

Further, the metal plate processing facility in this embodiment is provided with the gas concentration detection sensor 51 for detecting the concentration of the solvent vapor evaporated from the solvent in the drying chamber 5, but the present invention is not limited to this. For example, if the solvent is water, a significant value cannot be obtained even if the concentration is measured. Instead, a temperature sensor for detecting the temperature of the metal plate 100 is provided, and this temperature sensor and the damper adjusting device 9 are provided. And the opening degree of the exhaust duct 53 may be adjusted based on the temperature of the metal plate detected by the temperature sensor.
Of course, even when a solvent other than water is used, there is no reason to prevent the temperature sensor from being provided, or both a gas concentration effect sensor and a temperature sensor may be provided.

It is a schematic block diagram which shows the processing equipment of the metal plate in one embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal plate pre-processing equipment 2 Hot processing equipment 3 Coating chamber 31 Nozzle 32 Exhaust duct 34 Door 4 Intermediate chamber 42 Exhaust duct 45 Door 5 Drying chamber 51 Gas concentration detection sensor (concentration detection means)
52 Air supply duct 53 Exhaust duct 53a Damper (opening adjusting means)
56 Door 6 Pre-processing heating chamber (heating equipment)
65 Furnace 67 Door 7 Door open / close control device 8 Exhaust fan 81 Piping 82 Piping 9 Damper opening adjusting device (opening adjusting means)
100 Metal plate 100a Metal plate after oxide film formation 101 Metal plate after heat treatment before hot working 102 Products

Claims (5)

  A metal plate processing pretreatment facility characterized in that a film forming facility for forming an antioxidant coating by applying a chemical on the surface of a metal plate and a heating facility for heating the metal plate are continuously arranged.   2. The metal plate processing according to claim 1, wherein the film forming equipment includes a coating chamber for applying a film forming liquid to the metal plate, and a drying chamber for heating and evaporating the solvent from the coating film formed on the metal plate. Pretreatment equipment.   The liquid for film formation is a drug in which a film-forming component is mixed in a solvent, and the drying chamber includes a concentration detection means for detecting the concentration of the solvent vapor evaporated from the solvent, an exhaust duct, and the concentration detection means. The metal plate processing pretreatment facility according to claim 2, further comprising: an opening degree adjusting means for adjusting an opening degree of the exhaust duct based on the detected concentration of the solvent vapor.   The liquid for forming the film is a chemical in which the film forming component is mixed with the solvent, and the drying chamber has a temperature detecting means for detecting the temperature of the metal plate, an exhaust duct, and the metal plate detected by the temperature detecting means. The metal plate pre-processing equipment according to claim 2, further comprising an opening degree adjusting means for adjusting an opening degree of the exhaust duct based on the temperature of the exhaust duct.   A metal plate processing facility comprising the metal plate processing pretreatment facility according to any one of claims 1 to 4 in a preceding stage.

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