High-strength impact-resistant spoke material and processing technology thereof

Abstract

The invention discloses a high-strength impact-resistant spoke material which is prepared from the following components in percentage by mass: 2.00 percent to 2.40 percent of Si, 2.6 percent to 4.6 percent of Fe, 0.35 percent to 0.75 percent of Cu, 0 to 0.10 percent of Ti, 0.50 percent to 0.90 percent of Mn, 1.80 percent to 2.60 percent of Mg, 0.35 percent to 0.85 percent of Cr, 0 to 0.20 percent of Zn and the balance of Al and inevitable impurities. All alloy elements are added and smelted in the aluminum solution and are controlled within the specified range, the strength and impact resistance of the spoke are improved, and the service life is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of spokes, and in particular relates to a high-strength impact-resistant spoke material and a processing technology thereof. Background Art

[0002] Spokes are many rods, bars or straight lines extending outward from a center or hub on the same plane. Bicycle spokes, also called spokes, are straight sticks or steel bars that connect the hub and rim in the wheel. Spokes in bicycles have the functions of increasing the strength of the rim, supporting the tire, and adjusting the tightness of the spokes to ensure the stability of the bicycle.

[0003] Currently, spoke materials are usually made of alloys, which have a certain degree of corrosion resistance, but are relatively weak in terms of earthquake resistance and impact resistance. Especially in some complex ground environments and mountain off-road, higher requirements are needed for the strength and impact resistance of the spokes. Therefore, a high-strength and impact-resistant spoke material is in urgent need of research. Summary of the invention

[0004] In view of this, the technical problem to be solved by the present invention is to provide a high-strength impact-resistant spoke material and a processing technology thereof, so as to avoid the trouble of low strength and poor impact resistance of the previous spoke materials.

[0005] In order to solve the above technical problems, the present invention discloses a high-strength impact-resistant spoke material, which comprises, by mass percentage: Si: 2.00%-2.40%, Fe: 2.6%-4.6%, Cu: 0.35%-0.75%, Ti: 0-0.10%, Mn: 0.50%-0.90%, Mg: 1. 80%-2.60%, Cr: 0.35%-0.85%, Zn: 0-0.20%, the balance is Al and inevitable impurities; When the contents of Si, Cu, Ti and Cr are expressed in mass % as [Si%], [Cu%], [Ti%], [Cr%], the following formula (1) is satisfied: 48.5≥8×[Si%]+4×[Cu%]+15×[Ti%]+22×[Cr%]≥30.5; When the contents of Mn, Mg, and Zn are expressed in mass % as [Mn%], [Mg%], and [Zn%], the following formula (2) is satisfied: 42.5≥6×[Mn%]+13×[Mg%]+26×[Zn%]≥28.8.

[0006] The present invention also discloses a processing technology for a high-strength impact-resistant spoke material, comprising: Step a. Melting, weighing raw materials as needed and adding them into a smelting furnace for refining, stirring, degassing, slagging, and standing to obtain aluminum liquid; Step b. Casting, draining the refined aluminum liquid, filtering it, and cooling it in a casting well to obtain a cast rod; Step c. homogenizing, sawing the cast aluminum rod and performing homogenization treatment to obtain a homogenous aluminum rod; Step d. Extrusion: the homogeneous aluminum rod is heated in a rod furnace and then extruded through an extruder; Step e. quenching, the extruded profile is rapidly cooled by air cooling to change the structure and properties of the metal; Step f. Straightening: the extruded profile is straightened and stress released by a straightening machine, and the elongation rate during the straightening process is 0.4-0.8%; Step g. Surface treatment, using a carburizing process for surface hardening, and cooling to obtain a finished wire; Step h: machining to obtain spoke rods and spoke nipples.

[0007] Compared with the prior art, the present invention can achieve the following technical effects: By adding and smelting various alloy elements into the aluminum solution and controlling them within the prescribed range of the present invention, the strength and impact resistance of the spokes are improved and the service life is prolonged.

[0008] Of course, any product implementing the present invention does not necessarily need to achieve all of the above-mentioned technical effects at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a processing flow chart of the high-strength impact-resistant spoke material according to an embodiment of the present invention. DETAILED DESCRIPTION

[0010] The following will describe the implementation methods of the present invention in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0011] The present invention discloses a high-strength impact-resistant spoke material, which comprises, by mass percentage: Si: 2.00%-2.40%, Fe: 2.6%-4.6%, Cu: 0.35%-0.75%, Ti: 0-0.10%, Mn: 0.50%-0.90%, Mg: 1. 80%-2.60%, Cr: 0.35%-0.85%, Zn: 0-0.20%, the balance is Al and inevitable impurities; When the contents of Si, Cu, Ti and Cr are expressed in mass % as [Si%], [Cu%], [Ti%], [Cr%], the following formula (1) is satisfied: 48.5≥8×[Si%]+4×[Cu%]+15×[Ti%]+22×[Cr%]≥30.5; When the contents of Mn, Mg, and Zn are expressed in mass % as [Mn%], [Mg%], and [Zn%], the following formula (2) is satisfied: 42.5≥6×[Mn%]+13×[Mg%]+26×[Zn%]≥28.8.

[0012] Please refer to Figure 1 , Figure 1 It is a processing flow chart of the high-strength impact-resistant spoke material according to an embodiment of the present invention.

[0013] The present invention also discloses a processing technology for a high-strength impact-resistant spoke material, comprising: Step a. Melting, weighing raw materials as needed and adding them into a smelting furnace for refining, stirring, degassing, slagging, and standing to obtain aluminum liquid; Step b. Casting, draining the refined aluminum liquid, filtering it, and cooling it in a casting well to obtain a cast rod; Step c. homogenizing, sawing the cast aluminum rod and performing homogenization treatment to obtain a homogenous aluminum rod; Step d. Extrusion: the homogeneous aluminum rod is heated in a rod furnace and then extruded into a shape by an extruder; Step e. quenching, the extruded profile is rapidly cooled by air cooling to change the structure and properties of the metal; Step f. Straightening: the extruded profile is straightened and stress released by a straightening machine, and the elongation rate during the straightening process is 0.4-0.8%; Step g. Surface treatment, using a carburizing process for surface hardening, and cooling to obtain a finished wire; Step h: machining to obtain spoke rods and spoke nipples. Example 1

[0014] A high-strength impact-resistant spoke material, comprising, by mass percentage: Si: 2.00%, Fe: 2.6%, Cu: 0.35%, Mn: 0.50%, Mg: 1.80%, Cr: 0.35%, and the balance is Al and inevitable impurities.

[0015] Take a rectangular or circular sample of standard size and use a tensile testing machine to perform tensile and impact tests on the alloy to test its mechanical properties and impact resistance. The specific steps are as follows: (1) Tensile test The sample is fixed on a tensile testing machine and a tensile test is performed by applying force. During the test, the displacement and stress changes during the tensile process need to be recorded to calculate the elastic modulus, yield strength, fracture strength and other parameters of the aluminum alloy.

[0016] (2) Impact test The sample is fixed on a universal testing machine and an impact test is performed by applying an impact force. During the test, the displacement and impact force of the sample need to be recorded to calculate the impact toughness of the aluminum alloy.

[0017] During the tensile test, the stress-strain curve of the aluminum alloy was first recorded, and then the elastic modulus of the aluminum alloy was calculated, which was 64.1GPa. Then, the yield strength, tensile strength and fracture strength of the alloy were calculated, and the results were 280MPa, 310MPa and 350MPa respectively. Example 2

[0018] Si: 2.40%, Fe: 4.6%, Cu: 0.75%, Ti: 0.10%, Mn: 0.90%, Mg: 2.60%, Cr: 0.85%, Zn: 0.20%, and the balance is Al and inevitable impurities.

[0019] Take a rectangular or circular sample of standard size and use a tensile testing machine to perform tensile and impact tests on the alloy to test its mechanical properties and impact resistance. The specific steps are as follows: (1) Tensile test The sample is fixed on a tensile testing machine and a tensile test is performed by applying force. During the test, the displacement and stress changes during the tensile process need to be recorded to calculate the elastic modulus, yield strength, fracture strength and other parameters of the aluminum alloy.

[0020] (2) Impact test The sample is fixed on a universal testing machine and an impact test is performed by applying an impact force. During the test, the displacement and impact force of the sample need to be recorded to calculate the impact toughness of the aluminum alloy.

[0021] During the tensile test, the stress-strain curve of the aluminum alloy was first recorded, and then the elastic modulus of the aluminum alloy was calculated, which was 65.1GPa. Then, the yield strength, tensile strength and fracture strength of the alloy were calculated, and the results were 290MPa, 320MPa and 360MPa respectively. Example 3

[0022] Si: 2.20%, Fe: 3.0%, Cu: 0.55%, Ti: 0.05%, Mn: 0.70%, Mg: 2.20%, Cr: 0.50%, Zn: 0.10%, and the balance is Al and inevitable impurities, satisfying the following formulas (1) and (2).

[0023] Take a rectangular or circular sample of standard size and use a tensile testing machine to perform tensile and impact tests on the alloy to test its mechanical properties and impact resistance. The specific steps are as follows: (1) Tensile test The sample is fixed on a tensile testing machine and a tensile test is performed by applying force. During the test, the displacement and stress changes during the tensile process need to be recorded to calculate the elastic modulus, yield strength, fracture strength and other parameters of the aluminum alloy.

[0024] (2) Impact test The sample is fixed on a universal testing machine and an impact test is performed by applying an impact force. During the test, the displacement and impact force of the sample need to be recorded to calculate the impact toughness of the aluminum alloy.

[0025] During the tensile test, the stress-strain curve of the aluminum alloy was first recorded, and then the elastic modulus of the aluminum alloy was calculated, which was 68.1GPa. Then, the yield strength, tensile strength and fracture strength of the alloy were calculated, and the results were 300MPa, 340MPa and 380MPa respectively. It can be seen that the strength of the alloy is relatively high and is suitable for occasions with high strength requirements.

[0026] It is found through experiments that the aluminum alloy of Example 3 has high strength and impact toughness, and at the same time, the elastic modulus is relatively stable, and is suitable for occasions requiring high strength and high impact resistance.

[0027] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A high-strength impact-resistant spoke material, characterized in that: In terms of mass percentage, it includes: Si: 2.00%-2.40%, Fe: 2.6%-4.6%, Cu: 0.35%-0.75%, Ti: 0-0.10%, Mn: 0.50%-0.90%, Mg: 1.80%-2.60%, Cr: 0.35%-0.85%, Zn: 0-0.20%, the balance is Al and inevitable impurities; When the contents of Si, Cu, Ti and Cr are expressed in mass % as [Si%], [Cu%], [Ti%], [Cr%], the following formula (1) is satisfied: 48.5≥8×[Si%]+4×[Cu%]+15×[Ti%]+22×[Cr%]≥30.5; When the contents of Mn, Mg, and Zn are expressed in mass % as [Mn%], [Mg%], and [Zn%], the following formula (2) is satisfied: 42.5≥6×[Mn%]+13×[Mg%]+26×[Zn%]≥28.

8.

2. A processing technology for the high-strength impact-resistant spoke material according to claim 1, characterized in that: include: Step a. Melting, weighing raw materials as needed and adding them into a smelting furnace for refining, stirring, degassing, slagging, and standing to obtain aluminum liquid; Step b. Casting: drain the refined aluminum liquid, filter it, and then cool it in a casting well to obtain a cast rod; Step c. homogenizing, sawing the cast aluminum rod and performing homogenization treatment to obtain a homogenous aluminum rod; Step d. Extrusion: the homogeneous aluminum rod is heated in a rod furnace and then extruded into a shape by an extruder; Step e. quenching, the extruded profile is rapidly cooled by air cooling to change the structure and properties of the metal; Step f. Straightening: the extruded profile is straightened and stress released by a straightening machine, and the elongation rate of the straightening process is 0.4-0.8%; Step g. Surface treatment, using a carburizing process for surface hardening, and cooling to obtain a finished wire; Step h: machining to obtain spoke rods and spoke nipples.

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