Roller for reducing copper sticking on trapezoidal copper ingots and its manufacturing process and application

Abstract

The present invention belongs to the technical field of SCR copper rod continuous rolling, and specifically relates to a manufacturing process for a roller for reducing copper sticking to a trapezoidal copper casting billet, comprising the following steps: using the trapezoidal side edge inclination angle Ra (2) of the trapezoidal copper casting billet (1) as a reference value for the inclination angle of a roller surface of a roller (3), and limiting the deviation between the inclination angle value Rb (4) of the roller surface of the roller (3) and the reference value for the inclination angle of the roller surface of the roller (3) to 0° to 2°. The present invention can effectively reduce copper sticking to the roller surface of the trapezoidal copper casting billet when the latter is bitten into the first stand of a continuous rolling mill by rationally planning the design and manufacturing process of the roller profile, thereby extending the service life of the roller, making the surface quality of the continuously rolled copper rod more stable, and generating considerable economic benefits in terms of process costs.

Description

Technical Field

[0001] The invention belongs to the technical field of SCR copper rod continuous rolling, and particularly relates to a roller for reducing copper sticking on a trapezoidal copper casting billet, and a manufacturing process and application thereof. Background Art

[0002] During the continuous casting and rolling process of copper rod, molten copper first crystallizes on a casting wheel with a trapezoidal groove structure to form a copper ingot. As the casting wheel rotates, the copper ingot is continuously fed into the subsequent copper rod continuous rolling mill for rolling and deformation, ultimately becoming a copper round rod at the mill exit. The ingot cast from the casting wheel passes through a series of roll passes, typically forcibly rolling the trapezoidal ingot into a smaller, trapezoidal cross-section in the first stand. It then passes through subsequent symmetrical roll passes, undergoing a series of elliptical-circular roll passes before being transformed into a round copper rod in the final pass.

[0003] The cross-section of the continuous casting billet cast from the casting wheel typically has a trapezoidal profile, and only after two roughing passes does it become a geometric cross-section with a vertically symmetrical structure. As a rolled product, the copper billet undergoes severe plastic deformation in the first stand. When the trapezoidal copper billet is deformed by the first stand roll pass, the conventional roll design is not well adapted to the copper billet's trapezoidal cross-section. This often causes the metal to flow widely to one side within the roll grooves. This accumulation of metal flow causes excessive compressive stress on the roll surface in localized areas, ultimately leading to rapid copper sticking to the roll surface. This copper sticking phenomenon poses difficulties for the stable production of copper rod continuous rolling, causing rapid wear on the roll surface and a decline in the copper rod surface quality, resulting in economic losses. Therefore, it is necessary to develop a roll that can adapt to the cross-sectional shape of the trapezoidal copper billet to reduce copper sticking to the first stand rolls in copper rod continuous rolling. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology, provide a manufacturing process for rolling rollers that reduces copper sticking to trapezoidal copper billets, and solve the problem of trapezoidal copper billets biting into and sticking to copper caused by the original rolling roller profile of the copper rod continuous rolling head frame.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A process for manufacturing a roller for reducing copper sticking to a trapezoidal copper casting billet comprises the following steps:

[0007] The trapezoidal side inclination angle Ra of the trapezoidal copper ingot is used as the reference value of the inclination angle of the roll surface, and the deviation between the inclination angle value Rb of the roll surface and the reference value of the inclination angle of the roll surface is limited to 0°~2°, thereby reducing the tendency of metal to flow toward one side in the width direction, avoiding metal accumulation at the transition arc of the roll surface to form excessively high peak compressive stress, and thus reducing the effect of copper sticking to the roll surface.

[0008] Furthermore, the radius of the transition arc of the trapezoidal bottom of the roller surface is limited to (1.5~2)*the radius of the transition arc of the trapezoidal bottom of the original cross-section of the trapezoidal copper ingot, so as to adapt to the strong metal expansion flow at the bottom of the trapezoidal ingot, further avoid the formation of excessive roller surface compressive stress in the transition arc area of ​​the roller surface, and thus reduce the copper sticking to the roller surface at this position.

[0009] Based on a general inventive concept, another object of the present invention is to protect the rolls manufactured by the above-mentioned manufacturing process and their application in the SCR copper rod continuous rolling process: reducing copper sticking to the rolls when the trapezoidal copper ingot bites into the first stand.

[0010] Compared with the existing technology, the present invention can effectively reduce the copper sticking to the roller surface when the trapezoidal copper ingot is bitten into the first stand of the continuous rolling mill by rationally planning the design and manufacturing process of the roller profile, thereby extending the service life of the roller and making the surface quality of the continuously rolled copper rod more stable, which is reflected in the considerable economic benefits in terms of process costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The geometric diagram of the trapezoidal cross section of the copper ingot is shown below;

[0012] Figure 2 The traditional roller design has a mismatch between the roller surface inclination and the side inclination of the trapezoidal billet.

[0013] Figure 3 The roller design of the present invention reasonably matches the roller surface inclination angle with the trapezoidal casting billet side inclination angle.

[0014] Figure 1-3 The meanings of the marks are as follows: 1-trapezoidal copper ingot, 2-trapezoidal side inclination angle Ra, 3-roller, 4-inclination angle value Rb, 5-trapezoidal bottom transition arc, 6-original cross-section trapezoidal bottom transition arc. DETAILED DESCRIPTION

[0015] In the description of the present invention, it is necessary to understand that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. The purpose is only to facilitate the description of the present invention and simplify the description. It does not indicate or imply that the indicated components must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0016] Background of the implementation of a roller profile design and manufacturing process for reducing copper sticking to the roller surface when trapezoidal copper ingots are bitten into the first stand in copper rod continuous rolling production: In traditional SCR copper rod continuous casting and rolling production lines, the roller surface inclination angle of the first stand of the continuous rolling mill is usually 0-5°, which has no design correlation with the design value of the side inclination angle of the trapezoidal copper ingot. This can easily cause significant imbalance in the flow of metal on both sides of the roller surface along the width direction during rolling. Metal accumulation at the transition arc of the roller surface causes excessive compressive stress on the roller surface, which ultimately causes copper sticking to the roller surface.

[0017] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0018] On a copper rod continuous rolling production line of a certain factory, the cross-sectional schematic diagram of the trapezoidal copper ingot 1 produced by continuous casting of the casting wheel is shown as follows: Figure 1 As shown in the figure; the transition arc structure of the roll surface inclination angle and the lower bottom angle of the first stand roll in the traditional design is as follows Figure 2 shown.

[0019] The present invention provides a manufacturing process for a roller for reducing copper sticking to a trapezoidal copper casting billet, comprising the following steps:

[0020] The trapezoidal side inclination angle Ra 2 of the trapezoidal copper ingot 1 is used as the reference value of the inclination angle of the roll surface of the roller 3, and the deviation between the inclination angle value Rb 4 of the roll surface of the roller 3 and the reference value of the inclination angle of the roll surface of the roller 3 is limited to 0° to 2°, thereby reducing the tendency of the metal to flow unilaterally in the width direction, avoiding the accumulation of metal at the transition arc of the roll surface to form excessively high peak compressive stress, and thus playing the role of reducing copper sticking to the roll surface;

[0021] Furthermore, the radius of the trapezoidal bottom transition arc 5 of the roller surface of the roller 3 is limited to (1.5~2)*the radius of the trapezoidal bottom transition arc 6 of the original cross-section of the trapezoidal copper ingot 1, so as to adapt to the strong metal expansion flow at the bottom of the trapezoidal ingot, further avoid the formation of excessive roller surface compressive stress in the transition arc area of ​​the roller surface, and thus reduce the copper sticking to the roller surface at this position.

[0022] The roll surface inclination angle and the transition arc structure at the lower bottom corner of the first stand roll manufactured by the above manufacturing process are as follows: Figure 3 shown.

[0023] The above embodiment is specific as follows: for the case where the side inclination angle of the trapezoidal copper ingot is 9° and the radius of the transition arc of the original trapezoidal bottom bottom is 6.2mm, according to the process of the present invention, the traditional roller surface inclination angle of 5° and the radius of the transition arc of the trapezoidal bottom bottom is improved to a roller surface inclination angle of 10° and the radius of the transition arc of the trapezoidal bottom bottom is 10mm; when other production working parameters remain unchanged, the deformation amount of the pass remains unchanged, the material of the roll remains unchanged, and the tension state between the stands of each pass of the SCR continuous rolling mill is normal, only the roll profile produced by the process of the present invention is used to replace the original roll profile design, which can significantly reduce the occurrence of copper sticking on the roll surface; the first stand roll can stably produce copper rods with an output increased from about 5,000 tons to about 8,000 tons, and the service life is increased by about 60%, which confirms the significant effect of the method of the present invention and creates significant economic benefits.

[0024] The manufacturing process of the present invention rationally associates the inclination angle value of the roller surface of the first frame with the inclination angle of the side of the trapezoidal billet in design, thereby solving the problem of rapid copper adhesion to the roller surface caused by roller surface design reasons; at the same time, in the design of the transition arc of the roller surface, the present invention sets the transition arc radius value at the position on the roller surface corresponding to the lower bottom of the trapezoidal billet on the roller surface to 1.5 to 2 times the transition arc radius value of the billet, thereby adapting to the stronger metal widening flow trend at the lower bottom of the trapezoidal billet, and further achieving the effect of reducing copper adhesion to the roller surface.

[0025] The above embodiments are merely preferred implementations of the present invention. Any simple modifications, amendments, and substitutions made to the above embodiments based on the technical essence of the present invention fall within the scope of the technical solution of the present invention.

Claims

1. A process for manufacturing a roller for reducing copper sticking to a trapezoidal copper ingot, characterized by: Here are the steps: The trapezoidal side inclination angle Ra (2) of the trapezoidal copper casting billet (1) is used as a reference value for the inclination angle of the roller surface of the roller (3), and the deviation between the inclination angle value Rb (4) of the roller surface of the roller (3) and the reference value for the inclination angle of the roller surface of the roller (3) is limited to 0° to 2°; The radius of the trapezoidal bottom transition arc (5) of the roller surface of the roller (3) is limited to (1.5 to 2) multiplied by the radius of the trapezoidal bottom transition arc (6) of the original cross-section of the trapezoidal copper casting billet (1).

2. A roller manufactured by the manufacturing process as claimed in claim 1.

3. Application of a roller manufactured by the manufacturing process according to claim 1 in a continuous rolling process of an SCR copper rod, characterized in that: The trapezoidal copper ingot can reduce the copper sticking to the rolls when biting into the first stand.

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