Roller capable of reducing bonding copper of trapezoidal copper casting blank and manufacturing process and application of roller

Abstract

The invention belongs to the technical field of SCR (selective catalytic reduction) copper rod continuous rolling, and particularly relates to a manufacturing process of a roller capable of reducing copper adhesion of a trapezoidal copper casting blank, which comprises the following steps of: adopting a trapezoidal side inclination angle Ra (2) of the trapezoidal copper casting blank (1) as an inclination angle reference value 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 inclination angle reference value of the roller surface of the roller (3) is limited to be 0-2 degrees. By reasonably planning the design and the manufacturing process of the roller shape, the situation that the trapezoid copper casting blank is stuck to the roller surface when the trapezoid copper casting blank is bitten in the first rack of the continuous rolling mill can be effectively reduced, so that the service life of the roller is prolonged, the surface quality of a continuous rolling copper rod is more stable, and considerable economic benefits are formed in the process cost.

Description

Technical Field

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

[0002] In the copper rod continuous casting and rolling production process, the copper liquid first crystallizes at the casting wheel with a trapezoidal groove structure to form a copper billet. As the casting wheel rotates, the copper billet is continuously sent to the subsequent copper rod continuous rolling mill for rolling deformation, and finally becomes a copper round rod at the exit of the rolling mill. The billet cast from the casting wheel must pass through a series of pass rolling, usually from the trapezoidal billet to be forced to be rolled into a smaller trapezoidal cross-section rolled piece at the first stand, and then continue to enter the subsequent symmetrical structure of the pass, and go through a series of elliptical-circular pass structures before it can be transformed into a round copper rod at the last pass.

[0003] The cross-section of the continuous casting billet cast from the casting wheel is usually a trapezoidal profile, and it can only be turned into a geometric cross-section with a symmetrical structure from top to bottom through two rough rolling passes. As a rolled product, the copper billet undergoes severe plastic deformation in the first stand. When the trapezoidal copper billet is deformed by biting into the hole of the first stand roll, the traditional roll design cannot well adapt to the trapezoidal cross-sectional structure of the copper billet, which often causes the wide flow of metal in the roll groove to one side. In local areas, excessive roll surface compressive stress caused by the accumulation of metal flow will occur, which eventually leads to rapid copper adhesion on the roll surface. This copper adhesion phenomenon makes it difficult to stabilize the production of copper rod continuous rolling. While causing rapid wear of the roll surface, it also causes a decrease in the surface quality of the copper rod, 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 the copper adhesion of the first stand roll in the copper rod continuous rolling. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, provide a manufacturing process for a rolling roller that reduces copper sticking to a trapezoidal copper ingot, and solve the problem of copper sticking to a trapezoidal copper ingot caused by the original rolling roller shape of the first frame of a copper rod continuous rolling mill.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows: A manufacturing process for a roller for reducing copper sticking to a trapezoidal copper casting billet, comprising the following steps: 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 the metal to flow to one side in the width direction, avoiding the accumulation of metal on the transition arc of the roll surface to form excessively high peak compressive stress, thereby reducing the copper sticking to the roll surface.

[0006] 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, and further avoid the formation of excessive roller surface compressive stress in the transition arc area of ​​the roller surface, thereby reducing copper sticking to the roller surface at this position.

[0007] Based on a general inventive concept, another object of the present invention is to protect the rolls manufactured by the above manufacturing process and their application in the SCR copper rod continuous rolling process: to reduce copper sticking to the rolls when the trapezoidal copper ingot is bitten into the first stand.

[0008] Compared with the prior art, the present invention can effectively reduce the copper sticking to the roller surface when the trapezoidal copper ingot is bitten into the first frame of the continuous rolling mill by reasonably 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 continuous rolled copper rod more stable, which is reflected in the process cost as a considerable economic benefit. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a geometric diagram of the trapezoidal cross section of the copper ingot; Figure 2 The traditional roller design is that the roller surface inclination angle does not reasonably match the trapezoidal billet side inclination angle; Figure 3 The roller shape of the present invention is designed to reasonably match the roller surface inclination angle with the side inclination angle of the trapezoidal casting billet.

[0010] 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

[0011] 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, and 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, and therefore cannot be understood as a limitation on the present invention.

[0012] Background of the implementation of a roller profile design and manufacturing process for reducing copper sticking to the roller surface when a trapezoidal copper ingot is bitten into the first stand in the copper rod continuous rolling production: In the traditional SCR copper rod continuous casting and rolling production line, the roller surface inclination angle of the first stand of the continuous rolling unit is usually 0-5°, which has no design correlation with the design value of the side inclination angle of the trapezoidal copper ingot, which can easily cause a significant imbalance in the flow of metal on both sides of the roller surface along the width direction during rolling, and the metal accumulates at the transition arc of the roller surface, resulting in excessive compressive stress on the roller surface, which eventually causes copper sticking to the roller surface.

[0013] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0014] The schematic cross-sectional view of the trapezoidal copper ingot 1 produced by continuous casting of a casting wheel on a copper rod continuous rolling production line of a certain factory is shown in FIG. 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.

[0015] The present invention discloses a manufacturing process for a roller for reducing copper sticking of a trapezoidal copper casting billet, and the steps are as follows: The trapezoidal side inclination angle Ra 2 of the trapezoidal copper casting billet 1 is used as the reference value of 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 of the inclination angle of the roller surface of the roller 3 is limited to 0° to 2°, thereby reducing the tendency of the metal to flow to one side in the width direction, avoiding the accumulation of metal on the transition arc of the roller surface to form excessively high peak compressive stress, thereby reducing the copper sticking to the roller surface; 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 roller surface transition arc area, and reduce the copper sticking to the roller surface at this position.

[0016] 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.

[0017] 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 lower bottom of the original trapezoidal cross-section 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 lower bottom of the trapezoid are improved to a roller surface inclination angle of 10° and a radius of the transition arc of the lower bottom of the trapezoid is 10mm; when other production working condition parameters remain unchanged, the deformation amount of the pass remains unchanged, the material of the roller remains unchanged, and the tension state between the frames of each pass of the SCR continuous rolling mill is normal, only the roller profile made by the process of the present invention is used to replace the original roller profile design, which can significantly reduce the occurrence of copper sticking on the roller surface; the first frame roller 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 proves the remarkable effect of the method of the present invention and creates remarkable economic benefits.

[0018] 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 edge of the trapezoidal ingot in design, thereby solving the problem of rapid copper adhesion to the roller surface caused by the roller surface design; 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 trapezoid of the ingot to 1.5 to 2 times the transition arc radius value of the ingot, thereby adapting to the stronger metal widening flow trend at the lower bottom of the trapezoid of the ingot, and further achieving the effect of reducing copper adhesion to the roller surface.

[0019] The above embodiments are merely preferred implementations of the present invention. Any simple modification, amendment and substitution of the above embodiments based on the technical essence of the present invention are 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 casting billet, characterized in that: 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 rolling roller (3), and the deviation between the inclination angle value Rb (4) of the roller surface of the rolling roller (3) and the reference value for the inclination angle of the roller surface of the rolling roller (3) is limited to 0° to 2°.

2. The process for manufacturing a roller for reducing copper sticking of a trapezoidal copper casting according to claim 1, characterized in that: The radius value of the trapezoidal bottom transition arc (5) of the roller surface of the rolling roller (3) is limited to (1.5-2)*the radius value of the trapezoidal bottom transition arc (6) of the original cross-section of the trapezoidal copper casting billet (1).

3. A roller manufactured by the manufacturing process according to claim 1 or 2.

4. An application of a roller manufactured by the manufacturing process of claim 1 or 2 in a continuous rolling process of a SCR copper rod, characterized in that: The trapezoidal copper ingot can reduce the copper sticking to the rolls when it bites into the first stand.

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