Damping spacer and preparation method thereof

Abstract

The invention discloses a damping spacer and a preparation method thereof, and relates to the technical field of alloys. The damping spacer comprises a frame, a wire clamp and two fixedly-connected rotating shafts, the frame is connected with the wire clamp through the fixedly-connected rotating shafts, and the two fixedly-connected rotating shafts are located on the two sides of the frame respectively and are symmetrically arranged; the wire clamp comprises a wire clamp cover plate, a wire clamp main body and a rotating shaft; the wire clamp cover plate and the wire clamp main body are connected through the rotating shaft; the damping spacer further comprises a limiting shaft used for limiting the wire clamp body to rotate around the fixed connecting shaft and a nut used for fixing the wire clamp body, the frame and the fixed connecting shaft. A locking pin is arranged on the wire clamp main body, and the end part of the locking pin is connected with a cotter pin; the damping spacer is made of titanium alloy. The damping spacer has the advantages of being high in strength and corrosion resistance, and can solve the problems that an existing line fitting is insufficient in reliability and short in service life under the extreme environment working condition.

Description

Technical Field

[0001] This invention relates to the technical field of alloys, and more particularly to a damping spacer and its preparation method. Background Technology

[0002] Currently, novel titanium alloy fittings and their components, possessing high strength, high corrosion resistance, and low density, are of great significance for ensuring the safe transmission of power in some parts of my country under severe weather conditions such as strong winds and icing. Therefore, optimizing the design of titanium alloy fitting structures is crucial for extending their lifespan, ensuring safe operation, and reducing processing and maintenance costs in extreme environments. In extreme environments such as extreme low temperatures, heavy icing, and strong corrosion, the forces exerted on line fittings are several times greater than those on conventional lines, resulting in more severe wear and corrosion. Conventional line fittings are prone to twisting deformation or even complete breakage.

[0003] Conventional aluminum alloy damping spacers are manufactured using conventional casting processes. The spacers produced may contain defects such as pores, cracks, and inclusions, which significantly reduce their mechanical properties. Damping spacers produced using this process are not suitable for extreme environments such as repeated icing or strong corrosion. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a damping spacer and its preparation method. The damping spacer of this invention features high strength and high corrosion resistance, and can solve the problems of insufficient reliability and short service life of existing line fittings under extreme environmental conditions.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect, the present invention also provides a damping spacer, including a frame, a wire clamp, and a fixed connecting shaft. The frame and the wire clamp are connected by the fixed connecting shaft. There are two fixed connecting shafts, which are located on two sides of the frame and are symmetrically arranged.

[0007] The wire clamp includes a wire clamp cover plate, a wire clamp body, and a rotating shaft, wherein the wire clamp cover plate and the wire clamp body are connected by the rotating shaft.

[0008] The damping spacer also includes a limiting shaft for limiting the rotation of the clamp body around the fixed connection shaft and a nut for fixing the clamp body, the frame and the fixed connection shaft.

[0009] The clamp body is provided with a locking pin, and the end of the locking pin is connected to a cotter pin;

[0010] The damping spacer is made of titanium alloy, which comprises the following components by mass percentage:

[0011] Al 4.3–5.0 wt%; Zr 4.7–5.5 wt%; Nb 3.0–4.0 wt%; Mo 1.2–1.8 wt%; Cu 0.5–1.5 wt%; Si 0.1–0.5 wt%; B 0.05–0.1 wt%; balance Ti.

[0012] The damping spacer described in this invention has a compact structure, high strength, corrosion resistance, and long service life, making it suitable for extreme working conditions such as repeated icing and severe corrosion. Furthermore, by adding Nb, Mo, Cu, Zr, Si, and B to the titanium alloy, this invention improves the material's corrosion resistance and thermal stability compared to TC4, resulting in a titanium alloy damping spacer with excellent corrosion resistance and forging plasticity.

[0013] Preferably, both the clamp cover plate and the clamp body are provided with buffer pads.

[0014] Preferably, a damping pad is provided at the connection position between the clamp body and the frame.

[0015] Preferably, the buffer pad and damping pad are both made of a blend of hydrogenated styrene-butadiene block copolymer and acrylate rubber. The Shore hardness of the hydrogenated styrene-butadiene block copolymer / acrylate rubber blend is 74-76. The remaining components are all made of the aforementioned titanium alloy material.

[0016] Preferably, the damping pad has a semi-circular notch, which is fitted to the semi-circular protrusion on the clamp body and frame to improve the damping effect of the damping pad.

[0017] Preferably, the titanium alloy comprises the following components by mass percentage:

[0018] Al 4.5–4.8 wt%; Zr 4.7–4.9 wt%; Nb 3.2–3.9 wt%; Mo 1.5–1.8 wt%; Cu 0.5–1.5 wt%; Si 0.3–0.5 wt%; B 0.05–0.1 wt%; balance Ti.

[0019] Secondly, the present invention also provides a method for preparing a damping spacer, comprising the following steps:

[0020] S1: The raw materials Ti, Al, Zr, Nb, Mo, Cu, Si and B are mixed according to the formula, and then pressed to form an electrode block; then a consumable electrode is prepared by vacuum plasma welding process, and then the consumable electrode is remelted by vacuum consumable arc furnace to finally obtain a titanium alloy ingot.

[0021] S2: Free forging is performed on titanium alloy ingots to obtain forging blanks;

[0022] S3: Cut the forging blank according to the actual size of the damping spacer component;

[0023] S4: Heat the billet to 950-1000℃ and hold it for 2-3 hours. Place it in the mold. The mold preheating temperature is 200-300℃. Form the billet through step-by-step die forging.

[0024] S5: Place the forged damping spacer bar components into a heat treatment furnace, heat to 700-800℃, maintain for 2-3 hours, and then cool to room temperature in the furnace under a protective atmosphere.

[0025] S6: Correct the dimensions of the mating parts of the damping spacer components;

[0026] S7: Hang the parts with pure aluminum wire, immerse them in pickling solution at 15-35℃ for 1-2 minutes, take them out, rinse them with clean water until neutral, and then blow them dry.

[0027] S8: Assemble the various damping spacer components, rubber parts and standard parts after pickling to obtain the damping spacer.

[0028] Preferably, in step S1, the titanium alloy ingot is pretreated by inspecting the surface quality of the ingot, identifying defects such as cracks and inclusions, and removing severe surface defects by mechanical grinding.

[0029] Preferably, the specific steps for free forging the titanium alloy ingot in step S2 are as follows:

[0030] The titanium alloy ingot is subjected to 10 free forging cycles. The temperature of the first 4 cycles is above the phase transformation point of the titanium alloy, at 1000-1200℃, and the temperature of the last 6 cycles is below the phase transformation point of the titanium alloy, at 900-1000℃.

[0031] Preferably, the process parameters of the pickling solution in S7 are: HF 18-20 g / L, HNO3 350-365 g / L, and WJ corrosion inhibitor 10-20 g / L.

[0032] Preferably, the damping spacer has a tensile strength ≥950MPa and an elongation ≥14%.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] (1) The present invention adopts an all-titanium alloy structure, which improves the structural strength and corrosion resistance of the damping spacer.

[0035] (2) The present invention transforms the conventional double-frame structure into a single-frame structure, and combined with the ultra-high specific strength of titanium alloy material, the structural strength is dozens of times that of conventional power fittings, while the weight is the same as that of conventional spacer bars.

[0036] (3) The present invention uses a fixed connection shaft instead of bolts and nuts in the conventional structure, which improves the strength and corrosion resistance of the structure.

[0037] (4) The damping pad described in this invention is elliptical and has circular notches at both ends of the long axis, which improves the damping effect of the damping pad. Attached Figure Description

[0038] Figure 1 This is a front view of the damping spacer bar described in this invention; wherein, 1 is a frame; 2 is a wire clamp; 21 is a wire clamp cover plate; 22 is a wire clamp body; 23 is a rotating shaft; 24 is a wire hole; 3 is a fixed connection rotating shaft; 4 is a damping pad; 5 is a buffer pad; 6 is a limiting shaft; 7 is a nut; 8 is a locking pin; and 9 is a cotter pin.

[0039] Figure 2 This is a top view of the damping spacer described in this invention.

[0040] Figure 3 This is a partial cross-sectional view of the damping spacer described in this invention. Detailed Implementation

[0041] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments, but the scope of protection and implementation of the present invention are not limited thereto.

[0042] Unless otherwise specified, the materials and reagents used in the following examples are commercially available.

[0043] Example 1

[0044] This embodiment discloses a damping spacer, the structure of which is as follows: Figure 1 and Figure 2 As shown, the damping spacer includes a frame 1, wire clamps 2, and a fixed connecting shaft 3, which is rotatably connected to the frame 1. There are two fixed connecting shafts 3, located on opposite sides of the frame 1 and symmetrically arranged. There are also two wire clamps corresponding to the fixed connecting shafts 3.

[0045] like Figure 1As shown, the frame 1 and the wire clamp 2 are connected by a fixed connecting shaft 3. The wire clamp 2 includes a wire clamp cover plate 21, a wire clamp body 22, and a rotating shaft 23. The wire clamp cover plate 21 and the wire clamp body 22 are connected by the rotating shaft 23. A damping pad groove is provided at the connection position between the wire clamp body 22 and the frame 1, and a damping pad 4 is provided in the damping pad groove. The damping pad is made of hydrogenated styrene-butadiene block copolymer / acrylate rubber.

[0046] like Figure 1 As shown, the wire clamp 2 also includes a wire hole 24 for the wire to pass through and a buffer pad 5 for protecting the wire. The buffer pad 5 is embedded in the groove of the wire clamp cover plate 21 and the wire clamp body 22. The buffer pad is made of hydrogenated styrene-butadiene block copolymer / acrylate rubber blend.

[0047] like Figure 1 As shown, the fixed connecting shaft 3 has a mounting hole, and a limiting shaft 6 is rotatably connected to the mounting hole. The limiting shaft 6 is used to limit the rotation of the clamp body 21 around the fixed connecting shaft 3. The end of the fixed connecting shaft 3 is threaded, and the clamp body 22, frame 1, damping pad 4 and fixed connecting shaft 3 are pressed and fixed by a nut 7.

[0048] like Figure 1 As shown, the clamp body 22 is provided with a pin hole for inserting a locking pin 8, and a cotter pin 9 is inserted into the end of the locking pin 8. After the clamp cover plate 21 and the clamp body 22 clamp the wire, the locking pin 8 is inserted into the pin hole of the clamp body 22, and the cotter pin 9 is inserted into the end of the locking pin 8.

[0049] The frame, wire clamp, wire clamp cover plate, wire clamp body, rotating shaft, fixed connection rotating shaft, limiting shaft, nut, locking pin, and cotter pin of this invention are all made of titanium alloy, and the titanium alloy comprises the following components by mass percentage:

[0050] Al 4.5wt%; Zr 4.7wt%; Nb 3.2wt%; Mo 1.8wt%; Cu 1.5wt%; Si 0.5wt%; B 0.1wt%; balance Ti.

[0051] The working process of this invention for bi-split conductors is as follows:

[0052] The clamp body of the damping spacer is mounted on the split conductor.

[0053] After tightening the clamp cover plate, insert a locking pin into the pin hole of the clamping cover, and insert a cotter pin into the end hole of the locking pin.

[0054] This embodiment also discloses a method for preparing a damping spacer, including the following steps:

[0055] S1: Refining of titanium alloy materials. First, the raw materials for titanium alloy preparation, Ti, Al, Zr, Nb, Mo, Cu, Si, and B, are mixed in a certain proportion. After thorough mixing, they are pressed into electrode blocks. These blocks are then fabricated into consumable electrodes using a vacuum plasma welding process. Finally, the consumable electrodes are subjected to a second melting process in a vacuum arc furnace to obtain a dense and uniform titanium alloy ingot. The vacuum degree in both melting processes is ≤1×10⁻⁶. -3 .

[0056] S2: Pretreatment of titanium alloy ingots involves a combination of ultrasonic testing and manual inspection to check the surface quality and internal defects of the ingots, identify defects such as cracks and inclusions, and remove serious surface defects through mechanical grinding to prevent the formation of larger defects.

[0057] S3: Free forging of titanium alloy ingots. The titanium alloy ingots are subjected to 10 free forging cycles. The purpose of refining the grains and improving the plasticity of the alloy is achieved through a combination of phase transformation and deformation. The temperatures of the first 4 cycles are above the phase transformation point of the titanium alloy, and the temperatures of the four cycles are 1150~1170℃, 1020~1100℃, 1075~1095℃, and 1035~1055℃, respectively. The temperatures of the last 6 cycles are below the phase transformation point of the titanium alloy, and the temperatures are 950~970℃.

[0058] S4: Blanking. Blanking is an important preparatory step in the die forging process. The blank that has been forged by free forging is cut into a suitable shape and size to obtain the damping spacer component. Then the forging blank is blanked.

[0059] S5: Die forging. The billet is heated to 950-1000℃ and held for 2-3 hours to ensure that it has the required uniform temperature and appropriate plasticity before die forging. It is then placed in a mold made of H13 hot work die steel. The mold is preheated to 200-300℃. The billet is formed by step-by-step die forging. The first step uses an open mold to gradually bring the shape of the billet closer to the required contour. After the first die forging is completed, it is heated a second time at the same temperature of 950-1000℃. The second step uses a closed mold to refine the shape and details of the part, ensuring the dimensional accuracy and shape accuracy of the part.

[0060] S6: Stress-relief annealing. The forged titanium alloy damping spacer parts are placed in a heat treatment furnace to eliminate residual stress generated during the processing. This is to prevent these stresses from causing deformation, cracking, or performance degradation of the parts during subsequent use. The parts are heated to 700-800℃ and held for 2-3 hours. They are then cooled to room temperature in the furnace under the protection of argon gas.

[0061] S7: Reshaping, which involves correcting the dimensions of the mating parts of the damping spacer components. This is done by cutting away excess material to ensure that the final shape of the parts meets the design standards and to guarantee the assembly dimensions of the damping spacer component.

[0062] S8: Pickling. The parts are hung with pure aluminum wire and immersed in the pickling solution at 25°C for 2 minutes to remove surface oxide scale, residual processing oil, rust and other impurities, and improve surface quality. After being taken out, they are rinsed with clean water until neutral and then blown dry. The process parameters of the pickling solution are: HF 20 g / L, HNO3 350 g / L, WJ corrosion inhibitor 20 g / L.

[0063] S9: Assembly, which involves assembling the various components, rubber parts, and standard parts after pickling to form a titanium alloy reinforced damping spacer.

[0064] Example 2

[0065] The difference from Example 1 is that the titanium alloy comprises the following components by mass percentage:

[0066] Al 4.8wt%; Zr 4.9wt%; Nb 3.9wt%; Mo 1.5wt%; Cu 0.5wt%; Si 0.3wt%; B 0.05wt%; balance Ti.

[0067] The damping spacer prepared by this invention has a tensile strength of 950-1050 MPa and an elongation greater than 16%. The damping spacer prepared by this invention is subjected to CL testing according to JB / T 7901-2023. - Immersion was performed using a 5% sodium chloride solution (50±5 g / L), with the pH value (measured at 25℃) controlled within the range of 6.5-7.2. The test chamber temperature was kept constant at 25±2℃, and the annual corrosion depth of the spacer was 0.014 mm / year.

[0068] Comparative Example 1

[0069] The difference from Example 1 is that the titanium alloy used is ordinary TC4, the damping spacer has a tensile strength of 900MPa and an elongation of 12%.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A damping spacer, characterized in that, It includes a frame, a wire clamp, and a fixed connecting shaft. The frame and the wire clamp are connected by the fixed connecting shaft. There are two fixed connecting shafts, which are located on both sides of the frame and are symmetrically arranged. The wire clamp includes a wire clamp cover plate, a wire clamp body, and a rotating shaft, wherein the wire clamp cover plate and the wire clamp body are connected by the rotating shaft. The damping spacer also includes a limiting shaft for limiting the rotation of the clamp body around the fixed connection shaft and a nut for fixing the clamp body, the frame and the fixed connection shaft. The main body of the wire clamp is provided with a locking pin, and the end of the locking pin is connected to a cotter pin; The damping spacer is made of titanium alloy, which comprises the following components by mass percentage: Al 4.3–5.0 wt%; Zr 4.7–5.5 wt%; Nb 3.0–4.0 wt%; Mo 1.2–1.8 wt%; Cu 0.5–1.5 wt%; Si 0.1–0.5 wt%; B 0.05–0.1 wt%; balance Ti.

2. The damping spacer as described in claim 1, characterized in that, Both the clamp cover plate and the clamp body are equipped with buffer pads.

3. The damping spacer as described in claim 2, characterized in that, The connection point between the clamp body and the frame is equipped with a damping pad.

4. The damping spacer as described in claim 3, characterized in that, Both the buffer pad and the damping pad are made of hydrogenated styrene-butadiene block copolymer / acrylate rubber.

5. The damping spacer as described in claim 1, characterized in that, The titanium alloy comprises the following components by mass percentage: Al 4.5–4.8 wt%; Zr 4.7–4.9 wt%; Nb 3.2–3.9 wt%; Mo 1.5–1.8 wt%; Cu 0.5–1.5 wt%; Si 0.3–0.5 wt%; B 0.05–0.1 wt%; balance Ti.

6. A method for preparing a damping spacer as described in any one of claims 1-5, characterized in that, Includes the following steps: S1: The raw materials Ti, Al, Zr, Nb, Mo, Cu, Si and B are mixed according to the formula, and then pressed to form an electrode block; then a consumable electrode is prepared by vacuum plasma welding process, and then the consumable electrode is remelted by vacuum consumable arc furnace to finally obtain a titanium alloy ingot. S2: Free forging is performed on titanium alloy ingots to obtain forging blanks; S3: Cut the forging blank according to the actual size of the damping spacer component; S4: Heat the billet to 950-1000℃ and hold it for 2-3 hours. Place it in the mold. The mold preheating temperature is 200-300℃. Form the billet through step-by-step die forging. S5: Place the forged damping spacer bar components into a heat treatment furnace, heat to 700-800℃, maintain for 2-3 hours, and then cool to room temperature in the furnace under a protective atmosphere. S6: Correct the dimensions of the mating parts of the damping spacer components; S7: Hang the parts with pure aluminum wire, immerse them in pickling solution at 15-35℃ for 1-2 minutes, take them out, rinse them with clean water until neutral, and then blow them dry. S8: Assemble the various damping spacer components, rubber parts and standard parts after pickling to obtain the damping spacer.

7. The method for preparing the damping spacer as described in claim 6, characterized in that, In step S1, the titanium alloy ingot is pretreated by inspecting the surface quality of the ingot, identifying defects such as cracks and inclusions, and removing severe surface defects by mechanical grinding.

8. The method for preparing the damping spacer as described in claim 6, characterized in that, The specific steps for free forging the titanium alloy ingot in S2 are as follows: The titanium alloy ingot is subjected to 10 free forging cycles. The temperature of the first 4 cycles is above the phase transformation point of the titanium alloy, at 1000-1200℃, and the temperature of the last 6 cycles is below the phase transformation point of the titanium alloy, at 900-1000℃.

9. The method for preparing the damping spacer as described in claim 6, characterized in that, The process parameters of the pickling solution in S7 are: HF 18-20 g / L, HNO3 350-365 g / L, and WJ corrosion inhibitor 10-20 g / L.

10. The method for preparing the damping spacer as described in claim 6, characterized in that, The damping spacer has a tensile strength ≥950MPa and an elongation ≥14%.

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