High strength communication guy brace

Abstract

The application relates to the technical field of hoops and discloses a high-strength communication stay rope hoop, which is composed of the following components in percentage by mass: C 0.30-0.40%, Mo 0.25-0.75%, V 1.00-1.30%, Cu 0.25-0.30%, Ni 0.04-0.13%, Co 0.30-0.80%, Al 0.05-0.08%, Mn 1.53-1.80%, P<=0.02%, S<=0.02%, a reinforcing element 0.0325-0.0475%, and the balance of Fe and inevitable impurity elements; the reinforcing element comprises Nb, Sm, La and Cr. Through the technical scheme, the problem of low strength of the communication stay rope hoop in the related art is solved.

Description

Technical Field

[0001] This invention relates to the field of clamp technology, specifically to a high-strength communication cable clamp. Background Technology

[0002] Guy wire clamps are important fasteners used in communication poles and overhead lines to fix guy wires and ensure the stability of the pole structure. They are widely used in communication overhead pole lines and power-communication shared poles, etc. They mainly play a key role in transmitting guy wire tension, balancing the lateral load of the pole, and resisting wind load and external vibration. Their mechanical properties are directly related to the operational safety and long-term reliability of communication lines.

[0003] Currently, traditional guy wire clamps are mostly made of ordinary carbon steel through stamping, with a relatively simple alloy composition design and low overall strength. During long-term service, problems such as clamp deformation and connection failure are prone to occur, leading to safety hazards such as guy wire slack, tower tilting, and stress imbalance. Therefore, there is an urgent need to develop a high-strength guy wire clamp for communication applications. Summary of the Invention

[0004] This invention proposes a high-strength guy wire clamp for communication, which solves the problem of low strength in related technologies.

[0005] The technical solution of the present invention is as follows: This invention proposes a high-strength communication cable clamp, which, by mass percentage, consists of the following components: C 0.30%~0.40%, Mo 0.25%~0.75%, V 1.00%~1.30%, Cu 0.25%~0.30%, Ni 0.04%~0.13%, Co 0.30%~0.80%, Al 0.05%~0.08%, Mn 1.53%~1.80%, P≤0.02%, S≤0.02%, strengthening elements 0.0325%~0.0475%, with the balance being Fe and unavoidable impurity elements; The strengthening elements include Nb, Sm, La, and Cr; The mass content relationship of Nb, Sm, La and Cr is: Nb + 5 × Sm + 2 × La + Cr = 0.08%~0.15%, preferably 0.12%.

[0006] As a further technical solution, the mass content relationship between Nb and Cr is Nb / Cr = 2~5, preferably 4.

[0007] This invention also proposes a method for preparing a high-strength communication cable clamp, which includes the following steps: S1. After the ingredients are mixed according to the description, the mixture is smelted, and then cast and cooled to form a hoop billet. S2. After rolling and machining the clamp casting billet, a pre-formed clamp is obtained; S3. The preformed clamp is heat-treated to obtain the shaped clamp; S4. The high-strength communication cable clamp is obtained by pickling and washing the molded clamp.

[0008] As a further technical solution, the rolling process involves first heating the clamp casting billet, followed by rough rolling, finish rolling, and cooling.

[0009] As a further technical solution, the heat treatment involves heating the clamp casting billet to 850-900℃ at a heating rate of 10-15℃ / min, and then holding it at that temperature for 30-40 minutes.

[0010] As a further technical solution, the initial rolling temperature of the roughing mill is 820~880℃, and the final rolling temperature of the roughing mill is 700~750℃.

[0011] As a further technical solution, the roughing mill has 3 to 5 rolling passes, and the deformation amount of each rolling pass is 15% to 25%.

[0012] As a further technical solution, the initial rolling temperature of the finishing mill is 780~820℃, and the final rolling temperature of the finishing mill is 680~720℃.

[0013] As a further technical solution, the heat treatment is as follows: first, the temperature is raised to 200~300℃ at a first heating rate and held for 0.5~1h; then, the temperature is raised to 500~600℃ at a second heating rate and held for 1~3h; finally, the temperature is raised to 880~920℃ at a third heating rate and held for 2~4h; wherein the third heating rate < the first heating rate < the second heating rate.

[0014] As a further technical solution, the first heating rate is 8~12℃ / min, preferably 10℃ / min; the second heating rate is 14~16℃ / min, preferably 15℃ / min; and the third heating rate is 5~7℃ / min, preferably 6℃ / min.

[0015] In the preparation method of the high-strength communication cable clamp of the present invention, a three-stage heating heat treatment process is adopted. By controlling the heating rate in different temperature ranges, the residual stress generated during the stamping process can be eliminated, the homogenization of austenite can be promoted and the coarsening of austenite grains can be inhibited, and the steel structure can be refined and the grain boundaries can be purified, thereby improving the low-temperature toughness of the cable clamp and making it less prone to brittle fracture and deformation under low-temperature environment and complex load.

[0016] As a further technical solution, the pickling is performed using a 7wt%~8wt% hydrochloric acid aqueous solution.

[0017] The working principle and beneficial effects of this invention are as follows: This invention relates to a high-strength communication cable clamp that enhances its tensile strength by incorporating reinforcing elements composed of Nb, Sm, La, and Cr. Rare earth elements Sm and La purify grain boundaries and refine grains, while Nb forms fine, dispersed carbonitrides in steel, and Cr inhibits high-temperature austenite grain growth. Furthermore, by limiting the mass content relationship of Nb, Sm, La, and Cr to Nb + 5 × Sm + 2 × La + Cr = 0.08%~0.15%, the tensile strength of the communication cable clamp can be further improved. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1 A high-strength communication cable clamp, by weight percentage, is composed of the following components: C 0.30%, Mo 0.25%, V 1.00%, Cu 0.25%, Ni 0.04%, Co 0.30%, Al 0.05%, Mn 1.53%, P 0.005%, S 0.01%, strengthening element 0.0325%, with the balance being Fe and unavoidable impurity elements; The strengthening elements include Nb 0.01%, Sm 0.01%, La 0.0075%, and Cr 0.005%. The mass content relationships of Nb, Sm, La, and Cr are: Nb + 5 × Sm + 2 × La + Cr = 0.08%; the mass content relationship of Nb and Cr is Nb / Cr = 2. A method for preparing high-strength communication cable clamps includes the following steps: S1. After the ingredients are mixed according to the mass percentage, they are smelted, then cast and cooled to form a hoop billet; S2. After rolling and machining the hoop billet, a pre-formed hoop is obtained. The rolling process involves first heating the hoop billet (heating it to 850℃ at a heating rate of 10℃ / min and holding it at that temperature for 40min), followed by rough rolling, finish rolling, and cooling. The initial rolling temperature for rough rolling is 820℃, the final rolling temperature for rough rolling is 700℃, and the rough rolling process consists of 3 passes with a deformation of 25% per pass. The initial rolling temperature for finish rolling is 780℃, and the final rolling temperature for finish rolling is 680℃. S3. The pre-formed clamp is first heated to 200℃ at a heating rate of 8℃ / min and held for 1 hour; then heated to 500℃ at a heating rate of 14℃ / min and held for 3 hours; finally heated to 880℃ at a heating rate of 5℃ / min and held for 4 hours for heat treatment to obtain the formed clamp. S4. The molded clamp is pickled with a 7wt% hydrochloric acid aqueous solution and then washed with water to obtain a high-strength communication cable clamp.

[0020] Example 2 A high-strength communication cable clamp, by weight percentage, is composed of the following components: C 0.35%, Mo 0.55%, V 1.20%, Cu 0.28%, Ni 0.08%, Co 0.45%, Al 0.06%, Mn 1.65%, P 0.01%, S 0.015%, strengthening element 0.04%, with the balance being Fe and unavoidable impurity elements; The strengthening elements include Nb 0.01%, Sm 0.005%, La 0.02%, and Cr 0.005%. The mass content relationships of Nb, Sm, La, and Cr are: Nb + 5 × Sm + 2 × La + Cr = 0.08%; the mass content relationship of Nb and Cr is Nb / Cr = 2. A method for preparing high-strength communication cable clamps includes the following steps: S1. After the ingredients are mixed according to the mass percentage, they are smelted, then cast and cooled to form a hoop billet; S2. After rolling and machining the hoop billet, a pre-formed hoop is obtained. The rolling process involves first heating the hoop billet (heating it to 870℃ at a heating rate of 12℃ / min and holding it at that temperature for 35min), followed by rough rolling, finish rolling, and cooling. The initial rolling temperature for rough rolling is 850℃, the final rolling temperature for rough rolling is 725℃, and the rough rolling process consists of 4 passes with a deformation of 20% per pass. The initial rolling temperature for finish rolling is 800℃, and the final rolling temperature for finish rolling is 700℃. S3. The pre-formed clamp is first heated to 250℃ at a heating rate of 8℃ / min and held for 1 hour; then heated to 550℃ at a heating rate of 14℃ / min and held for 2 hours; finally heated to 900℃ at a heating rate of 5℃ / min and held for 3 hours for heat treatment to obtain the formed clamp. S4. The molded clamp is pickled with a 7wt% hydrochloric acid aqueous solution and then washed with water to obtain a high-strength communication cable clamp.

[0021] Example 3 A high-strength communication cable clamp, by weight percentage, is composed of the following components: C 0.40%, Mo 0.75%, V 1.30%, Cu 0.30%, Ni 0.13%, Co 0.80%, Al 0.08%, Mn 1.80%, P 0.02%, S 0.02%, strengthening element 0.0475%, with the balance being Fe and unavoidable impurity elements; The strengthening elements include Nb 0.02%, Sm 0.005%, La 0.0125%, and Cr 0.01%. The mass content relationships of Nb, Sm, La, and Cr are: Nb + 5 × Sm + 2 × La + Cr = 0.08%; the mass content relationship of Nb and Cr is Nb / Cr = 2. A method for preparing high-strength communication cable clamps includes the following steps: S1. After the ingredients are mixed according to the mass percentage, they are smelted, then cast and cooled to form a hoop billet; S2. After rolling and machining the hoop casting billet, a pre-formed hoop is obtained. The rolling process involves first heating the hoop casting billet (heating it to 900℃ at a heating rate of 15℃ / min and holding it at that temperature for 30min), followed by rough rolling, finish rolling, and cooling. The initial rolling temperature for rough rolling is 880℃, the final rolling temperature for rough rolling is 750℃, the number of rolling passes for rough rolling is 5, and the deformation amount for each rolling pass is 15%. The initial rolling temperature for finish rolling is 820℃, and the final rolling temperature for finish rolling is 720℃. S3. First, heat the pre-formed clamp to 300℃ at a heating rate of 8℃ / min and hold for 0.5h; then heat to 600℃ at a heating rate of 14℃ / min and hold for 1h; finally, heat to 920℃ at a heating rate of 5℃ / min for heat treatment and hold for 2h to obtain the formed clamp. S4. The molded clamp is pickled with an 8wt% hydrochloric acid aqueous solution and then washed with water to obtain a high-strength communication cable clamp.

[0022] Example 4 Compared with Example 2, the only difference in this example is that the strengthening elements in this example include Nb 0.012%, Sm 0.005%, La 0.02%, and Cr 0.003%; The mass content relationships of Nb, Sm, La, and Cr are: Nb + 5 × Sm + 2 × La + Cr = 0.08%; the mass content relationship of Nb and Cr is Nb / Cr = 4.

[0023] Example 5 Compared with Example 2, the only difference in this example is that the strengthening elements in this example include Nb 0.02%, Sm 0.008%, La 0.008%, and Cr 0.004%; The mass content relationships of Nb, Sm, La, and Cr are: Nb + 5 × Sm + 2 × La + Cr = 0.08%; the mass content relationship of Nb and Cr is Nb / Cr = 5.

[0024] Example 6 Compared with Example 2, the only difference in this example is that the strengthening elements in this example include Nb 0.004%, Sm 0.015%, La 0.02%, and Cr 0.001%; The mass content relationships of Nb, Sm, La, and Cr are: Nb + 5 × Sm + 2 × La + Cr = 0.12%; the mass content relationship of Nb and Cr is Nb / Cr = 4.

[0025] Example 7 Compared with Example 2, the only difference in this example is that the strengthening elements in this example include Nb 0.004%, Sm 0.025%, La 0.01%, and Cr 0.001%; The mass content relationships of Nb, Sm, La, and Cr are: Nb + 5 × Sm + 2 × La + Cr = 0.15%; the mass content relationship of Nb and Cr is Nb / Cr = 4.

[0026] Example 8 Compared with Example 2, the only difference in this example is that in the preparation method of the high-strength communication cable clamp in this example, step S3 is to first heat the pre-formed clamp to 250°C at a heating rate of 8°C / min and hold it at that temperature for 1 hour; then heat it to 550°C at a heating rate of 14°C / min and hold it at that temperature for 2 hours; finally heat it to 900°C at a heating rate of 6°C / min and hold it at that temperature for 3 hours to obtain the formed clamp.

[0027] Example 9 Compared with Example 2, the only difference in this example is that in the preparation method of the high-strength communication cable clamp in this example, step S3 is to first heat the pre-formed clamp to 250°C at a heating rate of 8°C / min and hold it at that temperature for 1 hour; then heat it to 550°C at a heating rate of 14°C / min and hold it at that temperature for 2 hours; finally heat it to 900°C at a heating rate of 7°C / min and hold it at that temperature for 3 hours to obtain the formed clamp.

[0028] Example 10 Compared with Example 2, the only difference in this example is that in the preparation method of the high-strength communication cable clamp in this example, step S3 is to first heat the pre-formed clamp to 250°C at a heating rate of 8°C / min and hold it for 1 hour; then heat it to 550°C at a heating rate of 15°C / min and hold it for 2 hours; finally heat it to 900°C at a heating rate of 6°C / min and hold it for 3 hours to obtain the formed clamp.

[0029] Example 11 Compared with Example 2, the only difference in this example is that in the preparation method of the high-strength communication cable clamp in this example, step S3 is to first heat the pre-formed clamp to 250°C at a heating rate of 8°C / min and hold it at that temperature for 1 hour; then heat it to 550°C at a heating rate of 16°C / min and hold it at that temperature for 2 hours; finally heat it to 900°C at a heating rate of 6°C / min and hold it at that temperature for 3 hours to obtain the formed clamp.

[0030] Example 12 Compared with Example 2, the only difference in this example is that in the preparation method of the high-strength communication cable clamp in this example, step S3 is to first heat the pre-formed clamp to 250°C at a heating rate of 10°C / min and hold it at that temperature for 1 hour; then heat it to 550°C at a heating rate of 15°C / min and hold it at that temperature for 2 hours; finally heat it to 900°C at a heating rate of 6°C / min and hold it at that temperature for 3 hours to obtain the formed clamp.

[0031] Example 13 Compared with Example 2, the only difference in this example is that in the preparation method of the high-strength communication cable clamp in this example, step S3 is to first heat the pre-formed clamp to 250°C at a heating rate of 12°C / min and hold it at that temperature for 1 hour; then heat it to 550°C at a heating rate of 15°C / min and hold it at that temperature for 2 hours; finally heat it to 900°C at a heating rate of 6°C / min and hold it at that temperature for 3 hours to obtain the formed clamp.

[0032] Example 14 Compared with Example 2, the only difference in this example is that in the preparation method of the high-strength communication cable clamp in this example, step S3 is to heat the pre-formed clamp to 900°C at a heating rate of 15°C / min and keep it at that temperature for 3 hours to obtain the formed clamp.

[0033] Comparative Example 1 Compared with Example 1, the only difference in this comparative example is that the reinforcing elements in this comparative example are Sm, La and Cr in a mass ratio of 4:3:2.

[0034] Comparative Example 2 Compared with Example 1, the only difference in this comparative example is that the reinforcing elements in this comparative example consist of Nb, La and Cr in a mass ratio of 4:3:2.

[0035] Comparative Example 3 Compared with Example 1, the only difference in this comparative example is that the reinforcing elements in this comparative example consist of Nb, Sm and Cr in a mass ratio of 4:4:2.

[0036] Comparative Example 4 Compared with Example 1, the only difference in this comparative example is that the reinforcing elements in this comparative example consist of Nb, Sm and La in a mass ratio of 4:4:3.

[0037] Experimental Example 1 The tensile strength of the communication cable clamps prepared in Examples 1-7 and Comparative Examples 1-4 was tested according to the test methods specified in standard GB / T 228.1-2021 "Metallic materials, tensile testing—Part 1: Test at room temperature"; the test rate was 0.008 s. -1 The test results are shown in Table 1: Table 1. Test results of tensile strength of guy wire clamps for communication

[0038] The data in Table 1 show that the tensile strength of the communication cable clamp can be improved by limiting the composition and mass content of the reinforcing elements in the preparation of the present invention.

[0039] Experiment Example 2 The communication cable clamps prepared in Examples 2, 8-14 were tested for low-temperature impact energy at -40℃ according to the test method specified in GB / T 229-2020 "Metallic Materials Charpy Pendulum Impact Test Method". The specimen type was a V-notch specimen with a notch angle of 45°, a notch bottom radius of 0.25mm, a notch depth of 2mm, and a specimen size of 55mm×10mm×10mm. The test results are shown in Table 2. Table 2. Low-Temperature Impact Test Results of Communication Cable Clamps

[0040] Table 2 shows that the preparation of the present invention is achieved by limiting the heat treatment process as follows: first, heating to 200~300℃ at a first heating rate and holding for 0.5~1h; then heating to 500~600℃ at a second heating rate and holding for 1~3h; finally, heating to 880~920℃ at a third heating rate and holding for 2~4h; wherein, the third heating rate < the first heating rate < the second heating rate can improve the low-temperature impact toughness of the communication cable clamp.

[0041] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-strength communication cable clamp, characterized in that, By mass percentage, it consists of the following components: C 0.30%~0.40%, Mo 0.25%~0.75%, V 1.00%~1.30%, Cu 0.25%~0.30%, Ni 0.04%~0.13%, Co 0.30%~0.80%, Al 0.05%~0.08%, Mn 1.53%~1.80%, P≤0.02%, S≤0.02%, strengthening elements 0.0325%~0.0475%, with the balance being Fe and unavoidable impurity elements; The strengthening elements are Nb, Sm, La, and Cr; The mass content relationship of Nb, Sm, La, and Cr is: Nb + 5 × Sm + 2 × La + Cr = 0.08%~0.15%; The mass content relationship between Nb and Cr is Nb / Cr = 2~5, and Cr 0.001%.

2. A method for preparing a high-strength communication cable clamp, used to prepare the high-strength communication cable clamp as described in claim 1, characterized in that, Includes the following steps: S1. After the ingredients are mixed according to the description, the mixture is smelted, and then cast and cooled to form a hoop billet. S2. After rolling and machining the clamp casting billet, a pre-formed clamp is obtained; S3. The preformed clamp is heat-treated to obtain the shaped clamp; S4. The high-strength communication cable clamp is obtained by pickling and washing the molded clamp.

3. The method for preparing a high-strength communication cable clamp according to claim 2, characterized in that, The rolling process involves first heating the hoop billet, followed by rough rolling, finish rolling, and cooling.

4. The method for preparing a high-strength communication cable clamp according to claim 3, characterized in that, The heat treatment involves heating the clamp casting billet to 850-900°C at a heating rate of 10-15°C / min, and then holding it at that temperature for 30-40 minutes.

5. The method for preparing a high-strength communication cable clamp according to claim 3, characterized in that, The initial rolling temperature of the roughing mill is 820~880℃, and the final rolling temperature of the roughing mill is 700~750℃.

6. The method for preparing a high-strength communication cable clamp according to claim 3, characterized in that, The roughing mill has 3 to 5 rolling passes, and the deformation amount of each rolling pass is 15% to 25%.

7. The method for preparing a high-strength communication cable clamp according to claim 3, characterized in that, The initial rolling temperature of the finishing mill is 780~820℃, and the final rolling temperature is 680~720℃.

8. The method for preparing a high-strength communication cable clamp according to claim 2, characterized in that, The heat treatment is as follows: first, the temperature is raised to 200-300℃ at a first heating rate and held for 0.5-1h; then, the temperature is raised to 500-600℃ at a second heating rate and held for 1-3h; finally, the temperature is raised to 880-920℃ at a third heating rate and held for 2-4h; wherein the third heating rate is less than the first heating rate and less than the second heating rate.

9. The method for preparing a high-strength communication cable clamp according to claim 8, characterized in that, The first heating rate is 8~12℃ / min; the second heating rate is 14~16℃ / min; and the third heating rate is 5~7℃ / min.

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