JPH07252537A - Device for straightening metal strip - Google Patents

Abstract

PURPOSE:To reduce the curling state and to improve the spring property of a metal strip after executing heat treatment. CONSTITUTION:Heating means 5 for heating the metal strip 3 passing through a heating furnace 28a are provided. Straightening rolls 50 composed of three rollers 51, 52, 53 arranged toward the direction crossing at the right angle to the carrying direction of the metal strip at each position of the rollers, where two rollers are arranged with a interval at its one side and one roller is arranged at the other side by interposing the carrying path 1 of the metal strip 3, and loading the tension force for straightening to the metal strip 3 by bringing three rollers into contact with the metal strip, especially by pushing one or two of these three rollers to the metal strip, are arranged in the heating furnace 28a or at the carry-out side of the heating furnace 28a. By this constitution, the straightening action is efficiently executed in high temp.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a straightening device for a metal strip which is heat-treated in the course of passing through a heating furnace so that the metal strip also has a straightening action.

[0002]

2. Description of the Related Art There are known technical matters in which a heating means is arranged in a heating furnace so that a metal strip is heat-treated while passing through the furnace.

[0003]

However, the mere heat treatment is not sufficient for some purposes. That is,
Metal strips used for small pieces such as semiconductor bases and switch contact plates must be flat even if they are cut into fine pieces, but the pieces may curl depending on the heat treatment conditions. To become
There is a problem that the spring performance is insufficient.

The metal strip straightening device of the present invention is provided to solve the above-mentioned problems (technical problems) of the prior art. The purpose is to reduce curl and improve springiness for the metal strip after heat treatment. Other objects and advantages will be readily apparent from the drawings and the following description related thereto.

[0005]

In order to achieve the above object, in the straightening device for a metal strip of the present invention, the heating furnace is provided with a heating means for heating the metal strip passing through the furnace. Further, inside the heating furnace or outside the furnace on the unloading side of the heating furnace, in order to straighten the heated metal strip, at least three pieces are arranged in a direction orthogonal to the transport direction of the metal strip. At least two rollers spaced apart on one side of the transport path of the metal strip, and on the other side at an intermediate position between the two rollers. At least one roller is provided, and one or two of these rollers are pressed against the metal strip being conveyed so that the three rollers come into contact with the metal strip and the metal In which the tensile force for straightening is allowed with a correction roller configured freely retractable towards the conveying path to be added to trip.

[0006]

The metal strip passing through the heating furnace is heat treated. In addition, tension is applied by a straightening roller and correction is also performed.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 to 7, reference numeral 1 denotes a transportation path of the metal strip formed in the lateral direction, along which the metal strip 3 is moved in the direction of the arrow 2 as shown in FIGS. The metal strip 3 is generally 0.1-4.0 mm
It has a thickness of 250 to 2000 mm and is made of various materials such as iron, copper alloys, aluminum and stainless steel.

Reference numeral 5 denotes a well-known static pressure type levitation nozzle, which blows out a gas such as the atmosphere or an atmospheric gas (for example, nitrogen gas, a mixed gas of nitrogen and hydrogen, etc.) from each of the air outlets 6. The blowout pressure corresponds to the unit weight of the metal strip 3, and a static pressure is formed on the lower portion 7 of the metal strip so that the static pressure can support the lower surface of the metal strip 3 in a floating state. As a floating nozzle for static pressure, JP-A-55-3117
It is also known from Japanese Patent Publication No. 8. Since the levitation nozzle is a heating means, its blowing temperature is a temperature required to raise the metal strip introduced from the inlet 42 to a predetermined temperature in the heating zone 28a, and the jet nozzle 4 located above the metal strip. The relationship between the temperature of the jet gas and the thermal energy from a well-known heater (not shown) that heats the metal strip by utilizing the space 41 between the jet nozzles, which is appropriately arranged above the furnace, and the nature and thickness of the metal strip. Etc. Normally, a metal strip at room temperature is heated from 300 ℃ to 500 ℃
It raises the temperature to 600 ℃, and even to 1100 ℃.
It is determined according to the heat treatment normally required such as drying, baking, or annealing of the coating. Reference numeral 8 indicates a well-known supporting roller for supporting the metal strip on the inlet side in the cold state.
Further, as the heating means, an induction heater may be arranged in the heating furnace 28a instead of part of the levitation nozzle.

Reference numeral 9 denotes a metal strip supporting roller which can be moved up and down so that it can be supported or unsupported between the floating nozzles. The number of rollers 9 is
Even if it is at an intermediate position in the heating furnace 28a as shown in the drawing, it may be arranged at any position between the levitation nozzles.
Also, it may be added to the existing heating furnace. This support roller 9
The bearing structure on both sides of is configured as shown in FIG. In FIG. 6 showing the vertical movement adjusting mechanism of the roller, 10 is a fixed frame, which is arranged close to the furnace wall 28. Reference numeral 11 denotes a hollow rectangular guide frame, which is fixedly connected to the fixed frame 10 in a fixed manner, and which holds the bearing frame 13 vertically movable by two rail members 12 on both sides that are long in the vertical direction. is doing. Reference numeral 14 is a hydraulic cylinder, and the vertical height of the bearing frame 13 including the bearing 16 can be continuously displaced and adjusted by vertically moving the rod 15. Therefore, the support roller 9 controls the cylinder 14 to move the bearing frame 13, the bearing 16, and the shaft 17 of the roller up and down within a vertical range limited by a limit switch (not shown), thereby forming a two-dot chain line. 9g, 9h
The range indicated by can be moved up and down and fixed at any position. Reference numeral 18 denotes a sprocket fixed to the free end of the shaft. By rotating the sprocket via a chain by a driving device (not shown), the roller 9 is rotated to give a conveying force to the metal strip in the directions indicated by the arrows 2, It is possible to form the same peripheral velocity as the metal strip. Reference numeral 19 denotes a bendable tubular body for hermetically sealing the inside of the furnace 28a and the outside, the free end of which is in close contact with the inner surface of the bearing frame 13, and a heat-resistant bellows-shaped part in the middle. Bellows 19a is used. 20 is a base portion 19b of the cylindrical body 19
It is a water-cooled structure that is airtightly connected to the furnace wall 28 by a fixed frame for hermetically fixing.

Next, the straightening roller 50 shown in FIGS.
It is for correcting the heated metal strips 3 being conveyed in the heating furnace along the conveyance path 1, and at least three pieces are arranged in a direction orthogonal to the conveyance direction 2 of the metal strips 3. It is composed of rollers 51, 52 and 53. As shown in FIG. 7, the positions of these three rollers are such that at least two rollers 52 and 53 are spaced on one side across the transport path 1 of the metal strip 3 by a gap 54 (for example, 300 m).
m) and at least one roller 51 is arranged on the other side toward the intermediate position 54 of the above two rollers, and one or two of these rollers are the above-mentioned conveying rollers. By pressing against the metal strip 3 therein, the three rollers contact the metal strips at the upper and lower positions of the transport path, and form curved portions 55 to 57 corresponding to a part of the roller peripheral surface with respect to the metal strip. As a result, a tensile force for straightening is applied in the transport direction of the metal strip. The operation in this case is called hot stretch operation, and the unit tension for the metal strip is 5 kg / mm ² or more.

As shown in FIG. 6, a hydraulic cylinder 14 is provided as a retractable mechanism for freely retracting the transport path 1.
With the use of the rod 15, the rod 15 is moved in and out to move over the transport path 1 or move backward. The first roller 51 may also serve as the support roller 9 shown in FIG. The second and third
As for the rollers 51 and 52, it is preferable to use the support roller shown in FIG. 6 upside down. In this case, the configurations related to the members denoted by reference numerals 10 to 18 can be used. The roller may be driven or driven as required. In addition, the number of rollers is 4 along the conveyance locus in FIG. 7 in response to the correction request.
The above may be arranged alternately in the vertical direction, or two sets for three may be arranged in parallel. The straightening roller is installed at a metal strip of 300 ° C to 600 ° C, preferably 400 ° C to 500 ° C.
Since the temperature at which the temperature is raised to about 600 ° C is the correct temperature for correction, the heating furnace 28a may be arranged outside the furnace on the discharge side 28d as shown in FIG.
1, 2 in any place in the heating furnace 28a (where it is heated to the correct temperature for straightening although it depends on the type of metal strip)
It is good to install it in several places.

Next, in the heating furnace, the slow cooling / cooling chamber quality 29 and the cooling chamber 30 shown in FIGS. 1 and 2, 31 indicates a heating fan for forced convection heating, which sucks and heats the gas in the chamber to generate an arrow 32.
And is circulated in the same direction, and high-heat heating gas is ejected from the jet nozzle 4 and the levitation nozzle 5 through the duct 33 (see also FIG. 5). Reference numeral 34 is a fan for forming a gas flow (arrow 35) for slow cooling or cooling, and ejects a gas of a temperature and amount corresponding to the application from the levitation nozzle 5 and the jet nozzle 4, respectively. 34 'is a gas flow for cooling (arrow 3
5 ') is formed by a fan for ejecting a gas having a temperature and amount corresponding to the application from the levitation nozzle 5 and the jet nozzle 4, respectively. 36 indicates the presence of a duct that penetrates the wall 29 'of the slow cooling chamber 29 and sends low temperature gas to the heating chamber 28a when necessary, and 37 indicates a front chamber 28b of the heating chamber 28a and a rear chamber of the cooling chamber 30. Room
A well-known metal strip support roller, which is disposed in each of 30a and has a gas sealing action so that gas between the two does not flow out of any of them, is shown. Reference numerals 43 denote openings for passing the metal strips 3, respectively.

In the above-described structure, as is well known, a coated metal strip 3 (or an annealing metal strip 3) having an arbitrary coating material applied in a thin film on the surface thereof is known.
Of the metal strip from the inlet 42 in the direction of the arrow 2 to the outlet 42 'along the transport path 1, and by blowing out the gas of appropriate temperature from each of the levitation nozzle 5 and the jet nozzle 4 (for example, heat treatment of the metal strip). The coating material is dried, baked or annealed). In this case, the levitation nozzles 5 are so arranged that the metal strip 3 that has entered at room temperature in the heating chamber 28a has an appropriate temperature at the final stage (for example, 300 ° C., or 800 ° C. or 1100 ° C. when used for annealing the metal strip). The blowout temperature of is set to increase in sequence.

In the heating chamber 28a, when the blowing pressure from the levitation nozzle 5 is sufficient for the metal strip 3, the metal strip 3 is conveyed in a levitation state as shown in FIG. Therefore, the roller 9 may be lowered. In a situation where the levitation force is relatively small with respect to the metal strip 3, or when it is better to slightly contact the roller 9 for stable transportation (prevention of flapping) of the metal strip 3, the roller 9 is The metal strip is slightly raised to slightly contact the lower surface of the metal strip, that is, to support the metal strip. Further, when the levitation force is relatively small, as shown in FIG. 3, the roller 9 is largely lifted to support the metal strip 3. In this case, the gas pressures ejected from the levitation nozzle 5 and the jet nozzle 4 are adjusted relatively or individually. If necessary, the gas flow from above, which acts as a load on the metal strip, may be eliminated. The usage state of the roller 9 can be similarly used in the slow cooling chamber 29.

[0015]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, not only the heat treatment of the metal strip can be performed in accordance with the heat treatment requirement, but also the curling property is reduced and the spring property is improved. There is an effective effect.

[Brief description of drawings]

FIG. 1 is a front view for explaining a partially broken view of a heat treatment furnace (a part of the right side is shown in a divided manner in FIG. 2).

FIG. 2 is a front view for explaining a partially broken view showing a remaining portion of FIG.

FIG. 3 is an explanatory diagram showing a relationship between a metal strip, a levitation nozzle, and a roller.

FIG. 4 is an explanatory diagram showing a relationship between a metal strip, a levitation nozzle, and a roller.

FIG. 5 is an explanatory diagram showing a relationship among a levitation nozzle in a heating chamber, a duct, and a metal strip.

FIG. 6 is a sectional view showing a bearing portion of a roller.

FIG. 7 is an explanatory view showing a relational position of a straightening roller.

[Explanation of symbols]

 1 Transport path 3 Metal strip 4 Jet nozzle 5 Levitation nozzle 9 Roller 50 Straightening roller

Claims (1)

[Claims] 1. The heating furnace is provided with a heating means for heating a metal strip passing through the furnace, and the heated metal is further provided inside the heating furnace or outside the furnace on the unloading side of the heating furnace. In order to straighten the strip, it comprises at least three rollers arranged in a direction orthogonal to the transport direction of the metal strip, the position of these rollers being one of the rollers on either side of the transport path of the metal strip. At least two rollers are arranged on one side, at least one roller is arranged on the other side at an intermediate position between the two rollers, and one or two of these rollers are By pressing against the metal strip being conveyed, the three rollers come into contact with the metal strip and a pulling force for straightening is applied to the metal strip, so that the roller can freely move in and out along the conveyance path. A straightening device for a metal strip, which is equipped with a straightening roller.