After-rolling cooling system and method for spiral wire

Abstract

The invention discloses an after-rolling cooling system for spiral wires. The after-rolling cooling system comprises a plurality of roller way conveying sections and a plurality of roller way conveying sections, a falling height difference exists between every two adjacent roller way conveying sections; a steering section is arranged in the plurality of roller way transportation sections, the steering section comprises two adjacent roller way transportation sections, and a turning angle of 30-90 degrees is formed between the conveying directions of the two adjacent roller way transportation sections. Correspondingly, the invention further discloses an after-rolling cooling method for the spiral wire rod. By the adoption of the method, more uniform cooling can be conducted on the form of the hot-rolled wire after spinning and looping, temperature inconsistency caused by inconsistent cooling speed is reduced, then the uniformity of microscopic structures and mechanical properties in the length direction of the wire is improved, fluctuation of the structures and the properties is reduced, smooth proceeding of the follow-up machining process is facilitated, and the production efficiency is improved. And the performance stability of the final part is improved.

Description

Technical Field

[0001] The present invention relates to a cooling system and method, and in particular to a cooling system and method for a wire. Background Art

[0002] At present, existing steel wire products are often arranged into a spiral shape through a spinning machine after hot rolling.

[0003] Generally speaking, there are two ways to cool a spiral: one is a process with a liquid medium, such as a hot water bath or a molten salt bath; the other is the Stelmor controlled cooling method.

[0004] The treatment process with liquid medium is to cool the wires arranged in a spiral shape in a liquid cooling medium to obtain a more uniform and stable cooling rate. The microstructure and mechanical properties of the treated wires are more stable. However, the molten salt bath has serious environmental pollution and high construction and maintenance costs. The surface oxidation of the wires treated with hot water baths is not easy to control, and the wires are prone to early rapid rust after they are off the line. At the same time, the adjustable range of the cooling rate of the liquid cooling medium cooling method is small, and it is only suitable for a small number of products with special requirements.

[0005] The Stelmor controlled cooling method is to spread the wires arranged in a spiral shape on a conveyor roller or conveyor chain for natural cooling or forced cooling by a blower. The cooling speed of the wires can be adjusted by adjusting the blowing size of the blower, or slow cooling can be achieved by adding a cover and insulation device.

[0006] Using the Stelmor controlled cooling method, the cooling speed of the wire has a large adjustable range, and a dense oxide layer can be formed on the surface of steel wire products to protect the material from being affected by the environment. However, after the wires are arranged in a spiral shape, their stacking density is uneven. There are overlaps between different circles of wires on both sides, while the wires near the center are independent of each other, resulting in inconsistent cooling conditions for wires at different positions. The cooling speed of the same circle of wires varies, which leads to large fluctuations in the microstructure and mechanical properties of the final wire products. Fluctuations in organizational properties may affect the smooth progress of subsequent deep processing, and may even cause defects that lead to material scrapping.

[0007] Therefore, a post-rolling cooling system and method for spiral wire with better performance is needed. Summary of the invention

[0008] One of the purposes of the present invention is to provide a post-rolling cooling system for spiral wire, which can improve the temperature uniformity of the wire during the cooling process, improve the microstructure and mechanical property stability of the wire, and at the same time do not increase the impact on the environment.

[0009] In order to achieve the above object, the present invention provides a post-rolling cooling system for a spiral wire, the cooling system comprising:

[0010] Several roller conveyor sections; there is a drop height difference between adjacent roller conveyor sections;

[0011] A turning section is provided in a plurality of roller conveying sections, wherein the turning section includes two adjacent roller conveying sections, and a turning angle of 30-90° is provided between the conveying directions of the two adjacent roller conveying sections.

[0012] In the present invention, the turning angle between the conveying directions of two adjacent roller conveyor sections is controlled between 30-90 degrees, so that the overlapping positions of the wires when they fall from the outlet of the previous conveyor section to the outlet of the next conveyor section can be changed, thereby changing the overlapping positions of the wires and improving the cooling conditions of the wires at different positions.

[0013] Furthermore, in the post-rolling cooling system for spiral wire rods described in the present invention, the number of the roller conveying sections is 5-20.

[0014] Furthermore, in the post-rolling cooling system for spiral wire rods described in the present invention, the length of a single roller conveying section is 5-15 m.

[0015] Furthermore, in the post-rolling cooling system for spiral wire rod described in the present invention, the total length of the plurality of roller conveying sections is greater than 50 m.

[0016] Furthermore, in the post-rolling cooling system for spiral wire described in the present invention, the drop height difference is 10-30 mm.

[0017] Furthermore, in the post-rolling cooling system for spiral wire described in the present invention, the number of the turning sections is 1-5.

[0018] Furthermore, in the post-rolling cooling system for spiral wire rods described in the present invention, the conveying speed of each roller conveying section is independently adjustable.

[0019] In the present invention, each roller conveying section includes an independent roller driving device, which can facilitate the individual setting of the conveying speed of the wire.

[0020] Furthermore, in the post-rolling cooling system for spiral wire described in the present invention, a heat-insulating cover that can be opened and closed is provided above the roller conveying section.

[0021] In the present invention, the heat preservation cover above the roller conveying section that can be opened and closed can meet the cooling requirements of different types of materials.

[0022] Furthermore, in the post-rolling cooling system for spiral wire described in the present invention, each of the roller conveying sections is provided with a fan with independently adjustable air volume.

[0023] In the present invention, an independent blower is included under each roller conveying section, and air is blown to the wire material through a blowing nozzle arranged between the rollers of the roller to achieve accelerated cooling. The air volume of the blower can be adjusted to meet the cooling requirements of different types of materials.

[0024] Furthermore, in the post-rolling cooling system for spiral wire described in the present invention, each of the roller conveying sections is provided with a guide plate so that the air volume in the middle of the roller conveying section is smaller than the air volume at the edge.

[0025] In the present invention, a flow guide device can be provided between the blower and the blowing nozzle to make the air volume near the center of the roller table smaller than that at the edge, thereby alleviating the difference in cooling speed caused by different stacking densities of the wires.

[0026] Another object of the present invention is to provide a post-rolling cooling method for spiral wire, which implements more uniform cooling of the hot-rolled wire after being spun into a coil, reduces temperature inconsistency caused by inconsistent cooling speed, and thereby improves the uniformity of the microstructure and mechanical properties along the length of the wire, reduces fluctuations in the structure and properties, is conducive to the smooth progress of subsequent processing, and improves the performance stability of the final parts.

[0027] In order to achieve the above-mentioned object, the present invention provides a method for cooling a spiral wire after rolling, which uses the spiral wire to be cooled in the post-rolling cooling system for the spiral wire described in the present invention.

[0028] Furthermore, in the post-rolling cooling method for spiral wire of the present invention, the temperature difference at different positions of the cooled spiral wire does not exceed 50°C.

[0029] Compared with the prior art, the post-rolling cooling system and method for spiral wire of the present invention have the following beneficial effects:

[0030] The present invention provides a post-rolling cooling system and method for spiral wires, which can implement more uniform cooling of the hot-rolled wires after being spun into coils, reduce temperature inconsistency caused by inconsistent cooling speeds, and further improve the uniformity of microstructure and mechanical properties in the length direction of the wires, reduce fluctuations in structure and performance, facilitate the smooth progress of subsequent processing, and improve the performance stability of final parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A top schematic diagram of a post-rolling cooling system for a spiral wire according to the present invention is schematically shown in one embodiment.

[0032] Figure 2 A side view of a post-rolling cooling system for a spiral wire according to the present invention is schematically shown in one embodiment.

[0033] Figure 3 The figure schematically shows a schematic diagram of a single coil of wire on a transport section of a post-rolling cooling system for spiral wire according to one embodiment of the present invention. DETAILED DESCRIPTION

[0034] The post-rolling cooling system and method for the spiral wire described in the present invention will be further explained and illustrated below in conjunction with the accompanying drawings and specific embodiments of the specification. However, such explanation and illustration do not constitute an improper limitation on the technical solution of the present invention.

[0035] Figure 1 A top schematic diagram of a post-rolling cooling system for a spiral wire according to the present invention is schematically shown in one embodiment.

[0036] Figure 2 A side view of a post-rolling cooling system for a spiral wire according to the present invention is schematically shown in one embodiment.

[0037] like Figure 1 As shown, in this embodiment, the post-rolling cooling system for spiral wire includes a plurality of roller conveying sections. Among the plurality of roller conveying sections, there is a turning section, and the turning section includes two adjacent roller conveying sections, and the conveying directions of the two adjacent roller conveying sections have a turning angle of 30-90°, for example Figure 1 The first transport section 2 and the second transport section 3 are adjacent roller conveyor sections, and similarly, the second transport section 3 and the third transport section 4 are also adjacent roller conveyor sections.

[0038] Of course, in other embodiments, the number of turning sections can be set as needed, for example, 1-5.

[0039] like Figure 2 As shown, there is a drop height difference 12 between adjacent roller conveying sections. In some embodiments, the drop height difference can be 10-30 mm.

[0040] like Figure 1 , Figure 2 As shown, the spiral wire 5 is spit out from the spinning machine 1 and enters the first transport section 2. The wire 5 is transported along the first transport direction 9 on the first transport section 2, and the wire 5 is transported along the second transport direction 10 on the second transport section 3. The wire 5 is transported along the third transport direction on the third transport section 4. Figure 1Two turning sections are shown in the figure, wherein the first transport section 2 and the second transport section 3 are a pair of adjacent roller conveyor sections, and the second transport section 3 and the third transport section 4 are another pair of adjacent roller conveyor sections. There is a first turning angle 11 (e.g., 90°) between the first transport section 2 and the second transport section 3, and there is a second turning angle (e.g., 90°) between the second transport section 3 and the third transport section 4.

[0041] Figure 3 The figure schematically shows a schematic diagram of a single coil of wire on a transport section of a post-rolling cooling system for spiral wire according to one embodiment of the present invention.

[0042] like Figure 3 As shown, for a single-loop wire 6, when it runs on the first transport section 2 and the third transport section 4, the overlapping positions of the wire loops are represented as 7, and when it runs on the second transport section 3, the overlapping positions of the wire loops are represented as 8. It can be seen that by changing the transport direction of the wire, the overlapping positions of the wires can be changed, thereby improving the cooling conditions of the wires at different positions.

[0043] It should also be noted that although Figure 1 and Figure 2 It is not shown in the figure, but in a preferred embodiment, the conveying speed of each roller conveying section is independently adjustable. A heat preservation cover that can be opened and closed is also provided above the roller conveying section to adjust the cooling speed.

[0044] In some preferred embodiments, each roller conveying section is provided with a fan with independently adjustable air volume, so that the cooling conditions of each roller conveying section can be adjusted individually.

[0045] In some preferred embodiments, each roller conveying section is further provided with a guide plate so that the air volume in the middle of the roller conveying section is smaller than the air volume at the edge.

[0046] Another embodiment of the present invention further provides a post-rolling cooling method for a spiral wire rod, which uses the post-rolling cooling system as described above to cool the spiral wire rod.

[0047] Below, this technical solution will use specific embodiment data to further describe the technical solution of this case and prove the beneficial effects of this case:

[0048] Example 1

[0049] In Example 1, a turning section is set with a turning angle of 90°, the drop height difference between adjacent roller transport sections is 30 cm, the wire diameter is 20 mm, the rolling speed and the spinning speed are coordinated with the control ring spacing of 15 mm, the wire is naturally cooled on the roller, and the average cooling rate of the wire is measured to be 0.7°C / s. At the end of cooling, the temperature difference of the wire at different positions is 45°C.

[0050] Example 2

[0051] Example 2 is provided with five turning sections, each with a turning angle of 30°, a drop height difference of 10 cm between adjacent roller conveyor sections, a wire diameter of 5 mm, a control ring spacing of 80 mm for the rolling speed and the spinning speed, and a wire blowing length of 40 m on the roller. 3 / s strong wind cooling, the average cooling rate of the wire was measured to be 16℃ / s, and the temperature difference at different positions of the wire was 20℃ at the end of cooling.

[0052] Example 3

[0053] In Example 3, two turning sections are provided, and the turning angles are both 90°, and the two turning directions are opposite, so that the rolling direction of the wire is consistent with the direction when spinning and the running direction at the end of cooling. The drop height difference between adjacent roller conveyor sections is 15 cm, the wire diameter is 12 mm, the rolling speed and spinning speed are coordinated with the control ring spacing of 40 mm, and the wire is blown on the roller for 10 m. 3 / s weak wind cooling, the average cooling rate of the wire was measured to be 2℃ / s, and the temperature difference at different positions of the wire was 40℃ at the end of cooling.

[0054] Example 4

[0055] Example 4 is provided with four turning sections, each with a turning angle of 60°, and the first two turning directions are opposite, and the last two turning directions are opposite, so that the wire rolling direction is consistent with the direction when spinning and the running direction at the end of cooling. The drop height difference between adjacent roller conveyor sections is 20 cm, the wire diameter is 14 mm, the rolling speed and spinning speed are coordinated with the control ring spacing of 50 mm, and the wire is blown on the roller for 50 m 3 / s strong wind cooling, the average cooling rate of the wire was measured to be 8℃ / s, and the temperature difference at different positions of the wire was 50℃ at the end of cooling.

[0056] Comparative Examples 1-3 do not have a turning section, Comparative Examples 1 and Comparative Example 2 are provided with a drop height difference, and Comparative Example 3 is not provided with a drop height difference.

[0057] Table 1 lists the specific process parameters of Examples 1-4 and Comparative Examples 1-3.

[0058] Table 1.

[0059]

[0060] It can be seen from Table 1 that the temperature difference of the spiral wire cooled by the post-rolling cooling system of the spiral wire of the present invention at different positions does not exceed 50° C. It can be seen that the cooling system can implement more uniform cooling of the shape of the hot-rolled wire after spinning into a coil, reduce the temperature inconsistency caused by inconsistent cooling speed, and thus improve the uniformity of the microstructure and mechanical properties in the length direction of the wire, reduce the fluctuation of the structure and performance, facilitate the smooth progress of the subsequent processing process, and improve the performance stability of the final parts.

[0061] However, in Comparative Example 1, no transitions between sections were set, and natural air cooling was performed without blowing air. At the end of cooling, the temperature of the overlapped positions of the wire edges was 260° C. higher than that of other positions.

[0062] In Comparative Example 2, no transitions between segments were set, and at the end of cooling, the temperature of the overlapping positions of the wire edges was 120° C. higher than that of other positions.

[0063] In comparative example 3, no turning points between sections are provided, and no drop section is provided on the entire roller conveyor. Even if air blast is added, the temperature of the overlapped position of the wire edge is still 180° C. higher than that of other positions at the end of cooling.

[0064] It should be noted that the prior art in the protection scope of the present invention is not limited to the embodiments given in the present application documents. All prior art that does not contradict the solutions of the present invention, including but not limited to prior patent documents, prior public publications, prior public uses, etc., can be included in the protection scope of the present invention.

[0065] In addition, the combination of the various technical features in this case is not limited to the combination described in the claims of this case or the combination described in the specific embodiments. All technical features recorded in this case can be freely combined or combined in any way unless there is a contradiction between them.

[0066] It should also be noted that the above-listed embodiments are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and similar changes or modifications made therewith can be directly derived or easily associated with by those skilled in the art from the contents disclosed in the present invention, and all should belong to the protection scope of the present invention.

Claims

1. A post-rolling cooling system for spiral wire, characterized in that: include: Several roller conveyor sections; there is a drop height difference between adjacent roller conveyor sections; A turning section is provided in a plurality of roller conveying sections, wherein the turning section includes two adjacent roller conveying sections, and a turning angle of 30-90° is provided between the conveying directions of the two adjacent roller conveying sections.

2. The post-rolling cooling system for spiral wire according to claim 1, characterized in that: The number of the roller conveying sections is 5 to 20.

3. The post-rolling cooling system for spiral wire according to claim 1, characterized in that: The length of a single roller conveyor section is 5-15m.

4. The post-rolling cooling system for spiral wire according to claim 1, characterized in that: The total length of the plurality of roller conveying sections is greater than 50 m.

5. The post-rolling cooling system for spiral wire according to claim 1, characterized in that: The drop height difference is 10-30 mm.

6. The post-rolling cooling system for spiral wire according to claim 1, characterized in that: The number of the turning sections is 1 to 5.

7. The post-rolling cooling system for spiral wire according to claim 1, characterized in that: The conveying speed of each roller conveying section is independently adjustable.

8. The post-rolling cooling system for spiral wire according to claim 1, characterized in that: A heat preservation cover which can be opened and closed is arranged above the roller conveying section.

9. The post-rolling cooling system for spiral wire according to claim 1, characterized in that: Each of the roller conveying sections is provided with a fan with independently adjustable air volume.

10. The post-rolling cooling system for spiral wire according to claim 1, characterized in that: Each of the roller conveying sections is provided with a guide plate so that the air volume in the middle of the roller conveying section is smaller than the air volume at the edge.

11. A method for cooling a spiral wire after rolling, characterized in that: The spiral wire is cooled by using the post-rolling cooling system as described in any one of claims 1 to 10.

12. The post-rolling cooling method according to claim 11, characterized in that: The temperature difference at different positions of the cooled spiral wire does not exceed 50°C.

Images