JP2004082186A - Method for manufacturing deformed bar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a deformed stock of a section similar to a product shape (a deformed bar) without via a long manufacturing process. <P>SOLUTION: In the method for manufacturing the deformed stock having at least one step of different thickness in section in the overall length in the longitudinal direction, the deformed stock is manufactured by extruding a heated cast billet by an extrusion press, and the deformed stock is formed into the predetermined deformed bar by the cold rolling. Different from a method for manufacturing the deformed stock by rolling, the deformed stock of the section similar to the product dissimilar shape can be obtained by extrusion, and the subsequent rolling pass times can be reduced. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a method for manufacturing a profiled strip having at least one step having a different thickness in a cross section along the entire length in the longitudinal direction.
[0002]
Problems to be solved by the prior art and the invention
Conventionally, cutting methods, rolling methods, and the like are known as methods for producing irregularly shaped strips. However, rolling methods are considered to be advantageous in terms of productivity and cost, and many methods have been proposed.
[0003]
For example, Japanese Patent Application Laid-Open No. 8-174128 discloses that a long metal strip abutted on a plate-shaped mold is pressed by a pressing roll that rolls in a range of the plate surface along the plate surface of the mold. Each time the pressing rolling is completed, the long metal strip is intermittently moved in the length direction by a fixed distance, and the long metal strip is formed into a deformed strip having a concave or convex strip in the length direction. There has been proposed a technique for improving the manufacturing method.
[0004]
However, in this type of method for manufacturing a deformed strip using a die and a pressing roll, the pressing roll is reciprocated in the length direction of the long metal strip, but actual molding is performed only on one side. I can't raise it. In addition, since the working tool having the development angle (the mold and the pressing roll) moves in the front-rear direction relative to the material and deforms the material in the lateral direction, the component force in the front-rear direction due to the development angle is wasted. It becomes. Further, since the wedge is formed into the material, cracking of the material is likely to occur when the forming depth is large. Further, the raw material used is processed through a long rolling process, and has a long flat strip / long lead time and a large input energy to the raw material.
[0005]
JP-A-11-740 discloses that a pair of rolling rolls having a substantially cylindrical roll body are provided in a plurality of stages, and a sheet material is sequentially rolled by these pair of rolling rolls to produce a deformed cross-sectional strip. In the manufacturing method, at least one of the pair of rolling rolls is formed with at least one protruding portion extending from the roll main body over substantially the entire circumference and projecting, and the protruding portion has a rotation center axis of the rolling roll. A rotating arc surface having a substantially center is formed, and the radius of curvature of the convex portion formed on the remarkable rolling roll is set to be gradually increased as the position becomes downstream in the moving direction of the plate material, and the convex portion of the rolling roll and the other A method has been proposed for producing a profiled section in which a thick section of the profiled section is rolled by at least a part of the roll body while rolling the thin section of the profiled section with a rolling roll. To have.
[0006]
In the above-mentioned method for producing a deformed cross-section strip, there is no intermittent pressing as in the method for manufacturing a deformed strip material using a die and a pressing roll, and continuous rolling is performed, and the deformed cross-section strip is rolled with a plurality of rolling rolls. However, in the case of manufacturing a variety of irregularly shaped cross-section strips having various thickness differences on the same rolling line, a large number of rolls are required and frequent replacement is unavoidable. Therefore, there is a concern that the cost of equipment such as rolls will increase and the production efficiency will decrease.
[0007]
On the other hand, Japanese Patent Application Laid-Open No. 2000-140975 discloses that a molten metal is continuously fed into a continuous casting machine to continuously cast a metal rod, and then the metal rod is roughly formed by a hot multi-high rolling mill. Hot-rolled to form a deformed cross section, then cool, pickle, and wash the rough formed cross section, then trim the water-washed rough formed cross section to a predetermined width, and then finish cool. A method for producing a deformed cross section in which a series of work steps are continuously performed in-line by cold rolling into a deformed cross section having a predetermined shape and dimensions by a groove rolling mill, and then winding the deformed cross section by a winder. Has been proposed.
[0008]
In the above-mentioned method for producing a deformed section, compared to the method for producing a section by a roll rolling method proposed in JP-A-8-174128 or JP-A-11-740, melting and casting are performed. Heating process when hot rolling the obtained ingot, and furthermore, repeat the process of `` cold rolling → annealing → oxide scale face milling '' several times without producing a long rolling process, to produce irregular shaped strips It is supposed to get. However, even if the metal rod coming out of the continuous casting machine is subsequently subjected to in-line hot rolling by a hot multi-stage rolling mill and cold rolling by a finishing cold rolling mill, a variety of sheets When manufacturing irregular cross-section strips with different thicknesses on the same rolling line, a large number of rolls are required, and they must be replaced frequently, which increases the equipment costs for rolls and reduces production efficiency. Is still a concern.
[0009]
The present invention has been made in view of the above-mentioned circumstances, and its object is to reduce the number of rolling passes and to produce a profiled strip having good shape quality without a long processing step. It is intended to provide a manufacturing method.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration. In other words, the method for producing a profiled strip according to claim 1 is a method for producing a profiled strip having at least one step with a different thickness in the cross section over its entire length in the longitudinal direction. And forming the deformed material into a predetermined deformed strip by cold rolling.
[0011]
And the manufacturing method of the deformed strip according to claim 2 is the manufacturing method of the deformed strip according to claim 1, wherein the extruded deformed material has a width corresponding to the width of each section of the deformed strip corresponding to the width of each section of the deformed material. It is preferably extruded so that the thickness ratio of each part is substantially the same and the thickness ratio of each part of the corresponding deformed strip is the same.
[0012]
In the manufacturing method according to the present invention, since the cast billet is hot-extruded by the extrusion press to produce the deformed material, unlike the production of the deformed material by rolling, the product shape (deformed strip) does not go through a long processing step. (1) It is possible to manufacture a deformed material having a cross-sectional shape similar to (2). In addition, since the extrusion is performed into a deformed material having a cross-sectional shape similar to a product deformed strip by extrusion, the number of subsequent rolling passes can be reduced. In addition, although cold rolling is performed in the end, in the rolling, the width direction dimensions of each thick portion of the deformed material by extrusion are formed to be approximately the same, so that only the longitudinal elongation due to the reduction in each plate thickness portion Therefore, there is no waste in the transformation from the deformed material to the product deformed strip, and the deformed strip can be manufactured with a small number of rolling passes. Further, the rolling speed can be greatly increased, and the production efficiency can be improved. In addition, it is possible to eliminate unnecessary deformation processing due to the irregular shape, and it is possible to avoid surface defects such as fine cracks at the base of the step, and to expect improvement in quality. Further, according to the manufacturing method according to the present invention, it is easy to manufacture a deformed strip having a large step ratio, which has been difficult to form by the conventional method. That is, when the thickness of the thinnest portion is h and the thickness of the thickest portion is H in the thickness of each portion of the irregularly shaped strip as described in claim 3, H / h ≧ 2 is satisfied. Articles can be manufactured. In particular, it is possible to easily manufacture a deformed strip in which the thickness of the thin portion where h ≦ 1 mm is small and H / h ≧ 2.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a manufacturing process diagram for describing an embodiment of a method for manufacturing a deformed strip according to the present invention.
[0014]
In the heating step A, the cylindrical billet 1 manufactured through the melting and casting steps is heated to a predetermined temperature.
[0015]
In the extrusion step B, the heated billet 1 is accommodated in the container 2 and the ram 3 is driven forward to extrude through the hole of the irregular shape formed in the extrusion die 4. By this extrusion, the deformed material 5 is extruded. Reference numeral 6 indicates a cross-sectional shape of the deformed material 5.
[0016]
In the pickling step C, the extruded shaped material 5 is pickled. The pickling removes dirt and oxides adhering to the deformed material 5.
[0017]
In the shape rolling step D, the pickled deformed raw material 5 has a hole shape in which the cross-sectional shape of the deformed raw material 5 is substantially the same as the cross-sectional shape and the thickness direction is formed thin by about 10 to 40%. Rolling is performed by rolling rolls 7 and 8. This rolling is repeated about once or several times until a deformed strip 9 having a predetermined size is obtained. Reference numeral 10 indicates the cross-sectional shape of the deformed strip 9 after rolling. In the figure, h indicates the thickness of the thinnest thin section of the deformed strip, and H indicates the thickness of the thickest thick section.
[0018]
In the refining process E, the deformed strip 9 formed to a predetermined size by the above-mentioned rolling is subjected to a treatment such as annealing and pickling to be commercialized.
[0019]
In the manufacture of the deformed strip 9 manufactured through the above-described steps, since the cast billet 1 is hot-extruded in the extrusion step B to manufacture the deformed material 5, unlike the manufacturing of the deformed material 5 by rolling, It is possible to manufacture the deformed material 5 having a sectional shape similar to the product deformed strip 9 without going through a long processing step. In addition, since the extruded material 5 is extruded into the deformed material 5 having a shape similar to the product deformed strip 9, the number of rolling passes in the rolling step D can be reduced to one to several times. In particular, in the rolling process D, since the thickness direction of each sheet thickness portion of the deformed material 5 by extrusion is almost the same, in the rolling step D, each sheet thickness portion is rolled only by elongation in the rolling direction. The deformed strip 9 can be manufactured with a small number of rolling passes without wasting the deformation of the deformed strip 9 from. Further, the rolling speed can be greatly increased, and the production efficiency can be improved. In addition, it is possible to easily produce a deformed strip having a large ratio (H / h ≧ 2) between the thick portion H and the thin wall portion h of the deformed strip 9, that is, a deformed strip having a large step ratio.
[0020]
【Example】
(Example 1)
Using a cylindrical billet of oxygen-free copper having a diameter of 150 mm, the material 5 was heated to 750 to 850 ° C. to extrude the deformed material 5 having a sectional shape shown in FIG. 2A. Next, the deformed raw material 5 was pickled and shape-rolled to produce a deformed strip 9 shown in FIG. 2B. The shape rolling at this time could be performed with a total reduction amount of 90% and a number of passes of 5 times. The thickness and width dimensions (unit: mm) of each plate thickness portion are also shown in the drawing.
[0021]
(Example 2)
By using a cylindrical billet of a copper alloy (Cu-0.1Fe-0.034P) having a diameter of 150 mm, the material was heated to 780 to 880 ° C. to extrude the deformed material 5 having a sectional shape shown in FIG. 3A. Next, the deformed raw material 5 was pickled and shape-rolled to produce a deformed strip 9 shown in FIG. 3B. The shape rolling at this time could be performed with a total reduction amount of 90% and four passes. The thickness and width dimensions (unit: mm) of each plate thickness portion are also shown in the drawing.
[0022]
(Example 3)
Using a cylindrical billet of a copper alloy (Cu-2.3Fe-0.03P-0.1Zn) having a diameter of 150 mm, the material 5 was heated to 850 to 950 ° C to extrude the deformed material 5 having a sectional shape shown in FIG. Next, the deformed raw material 5 was pickled and shape-rolled to produce a deformed strip 9 shown in FIG. 4b. The shape rolling at this time could be performed with a total reduction amount of 90% and a number of passes of 5 times. The thickness and width dimensions (unit: mm) of each plate thickness portion are also shown in the drawing.
[0023]
(Example 4)
Using a cylindrical billet of a copper alloy (Cu-0.15Zr) having a diameter of 150 mm, the material was heated to 850 to 950 ° C. to extrude the deformed material 5 having a sectional shape shown in FIG. 5A. Next, the irregular-shaped material 5 was pickled and shape-rolled to produce an irregular-shaped strip 9 shown in FIG. 5B. The shape rolling at this time could be performed with a total reduction amount of 95% and a number of passes of 9 times. The thickness and width dimensions (unit: mm) of each plate thickness portion are also shown in the drawing.
[0024]
(Example 5)
Using a cylindrical billet of a copper alloy (Cu-3.2Ni-0.7Si-0.3Zn) having a diameter of 150 mm, the material 5 was heated to 800 to 900 [deg.] C. to extrude the deformed material 5 having a sectional shape shown in FIG. Next, the deformed raw material 5 was pickled and shape-rolled to produce a deformed strip 9 shown in FIG. 6B. The shape rolling at this time could be performed with a total reduction amount of 90% and a number of passes of 5 times. The thickness and width dimensions (unit: mm) of each plate thickness portion are also shown in the drawing.
[0025]
【The invention's effect】
As described above, according to the method for manufacturing a deformed strip according to the present invention, since a cast billet is manufactured by hot extrusion by an extrusion press, a long processing step is different from manufacturing a deformed material by rolling. Without this, it is possible to manufacture a deformed material having a cross-sectional shape similar to the product shape (irregularly shaped strip). In addition, since the extruded material is extruded into a deformed material having a cross-sectional shape similar to that of the product deformed strip, the number of subsequent rolling passes can be reduced to manufacture the deformed strip.
[Brief description of the drawings]
FIG. 1 is a manufacturing process diagram for explaining an embodiment of a method for manufacturing a deformed strip according to the present invention.
FIG. 2 is a cross-sectional explanatory view of a deformed material and a deformed strip manufactured by applying the method of manufacturing a deformed strip according to the present invention, wherein a is a deformed material, and b is a deformed strip.
FIG. 3 is a cross-sectional view of another example of a deformed material and a deformed strip manufactured by applying the method of manufacturing a deformed strip according to the present invention, wherein a is a deformed material, and b is a deformed strip. .
FIG. 4 is a cross-sectional explanatory view of a deformed material and a deformed strip of another embodiment manufactured by applying the method for manufacturing a deformed strip according to the present invention, wherein a is a deformed material and b is a deformed strip. .
FIG. 5 is a cross-sectional explanatory view of a deformed material and a deformed strip of another embodiment manufactured by applying the method of manufacturing a deformed strip according to the present invention, wherein a is a deformed material and b is a deformed strip. .
FIG. 6 is a cross-sectional view of another example of a deformed material and a deformed strip manufactured by applying the method of manufacturing a deformed strip according to the present invention, wherein a is a deformed material and b is a deformed strip. .
[Explanation of symbols]
1: cylindrical billet 2: container 3: ram 4: extrusion die 5: deformed material 6: cross-sectional shape of deformed material 7, 8: rolling roll 9: deformed strip 10: cross-sectional shape of deformed strip A: heating step B: extrusion Process C: Pickling process D: Rolling process E: Refining process

Claims (3)

In a method of manufacturing a deformed strip having at least one step having a thickness different in a cross section over the entire length in the longitudinal direction, a heated cast billet is extruded by an extrusion press to produce a deformed material, and the deformed material is subjected to predetermined rolling by cold rolling. A method for producing an irregularly shaped article, characterized by being formed into an irregularly shaped article. The extruded deformed material has a width of each part of the deformed material substantially equal to the width of each part of the corresponding deformed strip, and the ratio of the thickness of each part is the same as the ratio of the thickness of each part of the corresponding deformed strip. The method for producing a profiled strip according to claim 1, wherein the extrusion is extruded as follows. The thickness of each part of the irregularly shaped strip, wherein the thickness of the thinnest part is h and the thickness of the thickest part is H, the deformed strip satisfying H / h ≧ 2 is manufactured. The method for producing the irregularly shaped article described.

Images