Preparation method of string with long service life

Abstract

The invention relates to the technical field of string preparation, and discloses a long-service-life string preparation method which comprises the steps of raw material preparation, processing and forming, string performance inspection and finished product packaging. The raw materials comprise the following components in parts by weight: 90-95 parts of iron, 3-8 parts of carbon, 2.5-4.5 parts of silicon, 2-7 parts of manganese, 0.1-0.2 part of titanium, 0.01-0.04 part of zirconium, 1-3 parts of an auxiliary agent I and 1-3 parts of an auxiliary agent II. The method is complete and reliable in process, the maximum tension and the maximum torsion of the string can be greatly increased by adding the process aid and the stability aid in the raw material preparation process, so that the strength and the deformability of the string are improved, and when the ratio of the process aid to the stability aid is the same, the stability of the string is improved. By adding the anti-oxidation agent, the strength and deformability of the string can be further improved, and by adding the stability agent, the anti-oxidation ability of the string is improved, explanation or deterioration is prevented, and the service life is greatly prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of string preparation, and specifically provides a method for preparing strings with a long service life. Background Art

[0002] A string is a wire that excites sound on a stringed instrument. Under a certain tension, the string is vibrated by means such as friction and plucking, and after being amplified by a resonance cavity, musical sounds are obtained. It is the most important component of a stringed instrument; a good string should have good sound quality, quick tuning, stable pitch, good playability, and a long service life. The lower the tension of the string, the more comfortable it is to press the string, but it also increases the possibility of fret buzz. The greater the tension does not necessarily mean a greater volume. A string with a higher tension will vibrate more violently, but this form of vibration does not play a major role in terms of volume; and the strings of a folk guitar refer to steel strings. For the first and second strings, the material is a high-carbon steel, which has good stretchability and elasticity. After being soaked in tin, a protective film is coated on it, reducing external corrosion and extending the service time. At the same time, it also has a bright appearance and a smooth feel.

[0003] However, due to the limitations of high-carbon steel materials, the strength and deformation ability of the strings themselves are also limited, and the high-carbon steel materials also limit the corrosion resistance of the strings. For example, in the patent document with the publication number CN108039159A, a method for preparing high-strength bass piano strings is disclosed. This published patent document still completely uses high-carbon steel for processing without adding other materials and processes, resulting in the overall performance of the strings still being very low; therefore, it is necessary to further increase the maximum tension, maximum torsion, and corrosion resistance of high-carbon piano strings during the process of preparing high-carbon steel into strings in order to increase and break through the service life of the strings. For this reason, this application proposes a method for preparing strings with a long service life that can increase the overall comprehensive performance of the strings. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for preparing strings with a long service life, which solves the problems raised in the background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A method for preparing strings with a long service life includes raw material preparation, processing and shaping, string performance inspection, and finished product packaging. The raw material preparation includes raw material ratio and primary raw material processing. The raw material ratio includes the following components: 90 - 95 parts of iron, 3 - 8 parts of carbon, 2.5 - 4.5 parts of silicon, 2 - 7 parts of manganese, 0.1 - 0.2 parts of titanium, 0.01 - 0.04 parts of zirconium, 1 - 3 parts of additive one, and 1 - 3 parts of additive two. The primary raw material processing uses a melting machine to melt and mix the above raw materials, and the melted and mixed mixture is then extruded into a rough steel wire.

[0007] The processing and forming includes the drawing of thick steel wires, the heat treatment of thick steel wires, and the chemical treatment of thin steel wires;

[0008] The performance inspection of the strings includes the detection of the diameter of thin steel wires, the detection of the tension of thin steel wires, the detection of the torsion of thin steel wires, and the corrosion resistance detection of thin steel wires;

[0009] The finished product packaging includes rust removal on the surface of the strings and wrapping protection on the surface of the strings.

[0010] As a further scheme of the present invention: The first auxiliary agent is a process auxiliary agent, and the second auxiliary agent is a stability auxiliary agent.

[0011] As a further scheme of the present invention: The melting temperature of the melting machine is 2400 - 2900 °C, and the melting time is 4 - 5 h. The diameter of the thick steel wire formed by extrusion is 6 - 10 mm.

[0012] As a further scheme of the present invention: The drawing of the thick steel wire uses a drawing machine to draw the thick steel wire into a thin steel wire. The heat treatment of the thick steel wire uses annealing to perform annealing operation on the thick steel wire. The drawing of the thick steel wire and the heat treatment of the thick steel wire are carried out reciprocally. The chemical treatment of the thin steel wire is used to perform carburizing operation on the drawn and heat-treated steel wire.

[0013] As a further scheme of the present invention: After the drawing of the thick steel wire is carried out multiple times, the diameter of the steel wire reaches 1 mm. The annealing temperature of the heat treatment of the thick steel wire is 600 - 700 °C, and the cooling temperature is room temperature.

[0014] As a further scheme of the present invention: The detection of the diameter of the thin steel wire is carried out using a micrometer. The detection of the tension of the thin steel wire is carried out using a tension tester. The detection of the torsion of the thin steel wire is carried out using a torsion tester. The corrosion resistance detection of the thin steel wire is carried out using a salt spray corrosion test machine.

[0015] As a further scheme of the present invention: The detection standard of the diameter of the thin steel wire is that the error between the diameters at various positions in the axial direction of the thin steel wire and the standard diameter of 1 mm is less than 1%. The detection method of the tension detection of the thin steel wire is that three thin steel wires are taken for each detection and the average value of the tension is taken for the detection result. The detection method of the torsion detection of the thin steel wire is that three thin steel wires are taken for each detection and the average value of the torsion is taken for the detection result. The detection method of the corrosion resistance detection of the thin steel wire is that three thin steel wires are taken for each detection to carry out a salt spray experiment at the same temperature and the same concentration, and the average value of the corrosion fracture time is calculated.

[0016] As a further scheme of the present invention: The rust removal on the surface of the strings is carried out by soaking in dilute hydrochloric acid. The wrapping protection on the surface of the strings is carried out by wrapping the surface of the strings with long filament plastic fibers.

[0017] As a further solution of the present invention: the surface of the string is pickled with a hydrochloric acid solution with a concentration of 4%, and the pickling time is 10 minutes. The surface of the string is wrapped with two layers of filament plastic fibers for protection.

[0018] Compared with the prior art, the beneficial effects of the technical solution of the present application are as follows:

[0019] 1. The process of this method is complete and reliable. Adding process aids and stability aids during the raw material preparation process can greatly increase the maximum tension and maximum torque of the strings, thereby increasing the strength and deformation ability of the strings themselves. When the ratio of the process aids to the stability aids is the same, the strength and deformation ability of the strings themselves can be further increased. Moreover, by adding the stability aids, the antioxidant ability of the strings themselves is increased, preventing hydrolysis or deterioration, and greatly increasing the service life.

[0020] 2. By repeatedly performing the drawing of the thick steel wire and the heat treatment of the thick steel wire, and performing multiple annealing treatments during the multiple drawing processes of the steel wire, both the stability during the drawing process and the overall strength of the strings can be ensured.

[0021] 3. Through the string performance inspection, the diameter, maximum tension, maximum torque and corrosion resistance of the fine steel wire can be detected, which is convenient for distinguishing qualified products and greatly increases the qualified rate of the strings.

[0022] 4. By pickling the surface of the string with a hydrochloric acid solution, the neatness of the wrapping of the filament plastic fibers is ensured. And by wrapping the filament plastic fibers, not only can the feel of plucking the string be increased, but also the contact between the steel wire and the air can be reduced, further playing a role in protecting the string. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the following detailed description of the non-restrictive embodiments with reference to the accompanying drawings, other features, objects and advantages of the present invention will become more apparent:

[0024] Figure 1 It is a line graph of the maximum tension of the strings in each embodiment of the present invention;

[0025] Figure 2 It is a line graph of the maximum torque of the strings in each embodiment of the present invention;

[0026] Figure 3 It is a line graph of the corrosion fracture time of the strings in each embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0028] Embodiment 1:

[0029] The present invention provides a method for preparing a string with a long service life, including raw material preparation, processing and shaping, string performance inspection, and finished product packaging. Raw material preparation includes raw material ratio and preliminary raw material processing. The raw material ratio consists of the following components: 93 parts of iron, 6 parts of carbon, 3.5 parts of silicon, 5 parts of manganese, 0.15 parts of titanium, 0.03 parts of zirconium, 1 part of additive 1, and 1 part of additive 2. Additive 1 is a process additive, and additive 2 is a stability additive. The preliminary raw material processing uses a melting machine to melt and mix the above raw materials. The melting temperature of the melting machine is 2750 °C, and the melting time is 4.5 h. The molten and mixed mixture is then extruded into a thick steel wire, and the diameter of the extruded thick steel wire is 8 mm.

[0030] Processing and shaping includes drawing of the thick steel wire, heat treatment of the thick steel wire, and chemical treatment of the thin steel wire. The drawing of the thick steel wire uses a drawing machine to draw the thick steel wire into a thin steel wire. After multiple draws of the thick steel wire, the wire diameter reaches 1 mm. The heat treatment of the thick steel wire uses annealing to perform an annealing operation on the thick steel wire. The annealing temperature of the heat treatment of the thick steel wire is 650 °C, and the cooling temperature is room temperature. The drawing and heat treatment of the thick steel wire are carried out reciprocally. The chemical treatment of the thin steel wire is used to perform carburizing on the drawn and heat-treated steel wire.

[0031] String performance inspection includes thin steel wire diameter detection, thin steel wire tension detection, thin steel wire torsion detection, and thin steel wire corrosion resistance detection. The thin steel wire diameter detection is carried out using a micrometer. The thin steel wire diameter detection standard is that the diameter error of each part in the axial direction of the thin steel wire from the standard diameter of 1 mm is less than 1%. The thin steel wire tension detection is carried out using a tension tester. The detection method for thin steel wire tension detection is that each time three thin steel wires are taken for detection and the average value of the tension is taken for the detection result. The thin steel wire torsion detection is carried out using a torsion tester. The detection method for thin steel wire torsion detection is that each time three thin steel wires are taken for detection and the average value of the torsion is taken for the detection result. The thin steel wire corrosion resistance detection is carried out using a salt spray corrosion test machine. The detection method for thin steel wire corrosion resistance detection is that each time three thin steel wires are taken for the same-temperature and same-concentration salt spray experiment, and the average value of the corrosion fracture time is calculated.

[0032] The finished product packaging includes rust removal from the surface of the strings and wrapping protection on the surface of the strings. For rust removal from the surface of the strings, it is soaked in a hydrochloric acid solution with a concentration of 4% for 10 minutes. For wrapping protection on the surface of the strings, it is wrapped with two layers of filament plastic fibers.

[0033] Example Two:

[0034] The present invention provides a method for preparing strings with a long service life, including raw material preparation, processing and shaping, string performance inspection, and finished product packaging. Raw material preparation includes raw material ratio and primary raw material processing. The raw material ratio consists of the following components: 93 parts of iron, 6 parts of carbon, 3.5 parts of silicon, 5 parts of manganese, 0.15 parts of titanium, 0.03 parts of zirconium, 1 part of additive one, and 2 parts of additive two. Additive one is a process additive, and additive two is a stability additive. For primary raw material processing, the above raw materials are melted and mixed using a melting machine. The melting temperature of the melting machine is 2750 °C, and the melting time is 4.5 hours. The melted and mixed mixture is then extruded into thick steel wires, and the diameter of the extruded thick steel wires is 8 mm.

[0035] Processing and shaping includes drawing of thick steel wires, heat treatment of thick steel wires, and chemical treatment of thin steel wires. For the drawing of thick steel wires, a drawing machine is used to draw thick steel wires into thin steel wires. For the heat treatment of thick steel wires, annealing is used to perform annealing operations on thick steel wires. Chemical treatment of thin steel wires is used to perform carburizing operations on the drawn and heat-treated steel wires.

[0036] String performance inspection includes detection of the diameter of thin steel wires, detection of the tension of thin steel wires, detection of the torsion of thin steel wires, and detection of the corrosion resistance of thin steel wires. For the detection of the diameter of thin steel wires, a micrometer is used for detection. For the detection of the tension of thin steel wires, a tension tester is used for detection. The detection method for the tension of thin steel wires is: each time three thin steel wires are taken for detection and the average value of the tension is taken for the detection result. For the detection of the torsion of thin steel wires, a torsion tester is used for detection. The detection method for the torsion of thin steel wires is: each time three thin steel wires are taken for detection and the average value of the torsion is taken for the detection result. For the detection of the corrosion resistance of thin steel wires, a salt spray corrosion test machine is used for detection. The detection method for the corrosion resistance of thin steel wires is: each time three thin steel wires are taken for the same-temperature and same-concentration salt spray experiment, and the average value of the corrosion fracture time is calculated.

[0037] The finished product packaging includes rust removal from the surface of the strings and wrapping protection on the surface of the strings. For rust removal from the surface of the strings, it is soaked in a hydrochloric acid solution with a concentration of 4% for 10 minutes. For wrapping protection on the surface of the strings, it is wrapped with two layers of filament plastic fibers.

[0038] Example Three:

[0039] The present invention provides a method for preparing a string with a long service life, including raw material preparation, processing and shaping, string performance inspection, and finished product packaging. Raw material preparation includes raw material ratio and preliminary raw material processing. The raw material ratio consists of the following components: 93 parts of iron, 6 parts of carbon, 3.5 parts of silicon, 5 parts of manganese, 0.15 parts of titanium, 0.03 parts of zirconium, 1 part of additive one, and 3 parts of additive two. Additive one is a process additive, and additive two is a stability additive. Preliminary raw material processing uses a melting machine to melt and mix the above raw materials. The melting temperature of the melting machine is 2750 °C, and the melting time is 4.5 h. The molten mixture is then extruded into a thick steel wire, and the diameter of the extruded thick steel wire is 8 mm.

[0040] Processing and shaping includes drawing of the thick steel wire, heat treatment of the thick steel wire, and chemical treatment of the thin steel wire. Drawing of the thick steel wire uses a drawing machine to draw the thick steel wire into a thin steel wire. Heat treatment of the thick steel wire uses annealing to perform an annealing operation on the thick steel wire. Chemical treatment of the thin steel wire is used to perform carburizing on the drawn and heat-treated steel wire.

[0041] String performance inspection includes detection of the diameter of the thin steel wire, detection of the tension of the thin steel wire, detection of the torsion of the thin steel wire, and detection of the corrosion resistance of the thin steel wire. Detection of the diameter of the thin steel wire is performed using a micrometer. Detection of the tension of the thin steel wire is performed using a tension tester. The detection method for the tension of the thin steel wire is: each time three thin steel wires are taken for detection and the average value of the tension is taken for the detection result. Detection of the torsion of the thin steel wire is performed using a torsion tester. The detection method for the torsion of the thin steel wire is: each time three thin steel wires are taken for detection and the average value of the torsion is taken for the detection result. Detection of the corrosion resistance of the thin steel wire is performed using a salt spray corrosion test machine. The detection method for the corrosion resistance of the thin steel wire is: each time three thin steel wires are taken for the same-temperature and same-concentration salt spray experiment, and the average value of the corrosion fracture time is calculated.

[0042] Finished product packaging includes rust removal on the surface of the string and wrapping protection on the surface of the string. Rust removal on the surface of the string is performed by soaking in a hydrochloric acid solution with a concentration of 4%, and the soaking time is 10 min. Wrapping protection on the surface of the string is performed by wrapping with two layers of long filament plastic fibers.

[0043] Example Four:

[0044] The present invention provides a method for preparing a string with a long service life, including raw material preparation, processing and shaping, string performance inspection, and finished product packaging. Raw material preparation includes raw material ratio and preliminary raw material processing. The raw material ratio consists of the following components: 93 parts of iron, 6 parts of carbon, 3.5 parts of silicon, 5 parts of manganese, 0.15 parts of titanium, 0.03 parts of zirconium, 2 parts of additive one, and 1 part of additive two. Additive one is a process additive, and additive two is a stability additive. Preliminary raw material processing uses a melting machine to melt and mix the above raw materials. The melting temperature of the melting machine is 2750 °C, and the melting time is 4.5 h. The molten mixture is then extruded into a thick steel wire, and the diameter of the extruded thick steel wire is 8 mm.

[0045] Processing and shaping includes drawing of the thick steel wire, heat treatment of the thick steel wire, and chemical treatment of the thin steel wire. The drawing of the thick steel wire uses a drawing machine to draw the thick steel wire into a thin steel wire. The heat treatment of the thick steel wire uses annealing to perform an annealing operation on the thick steel wire. The chemical treatment of the thin steel wire is used to perform a carburizing operation on the drawn and heat-treated steel wire.

[0046] String performance inspection includes detection of the diameter of the thin steel wire, detection of the tension of the thin steel wire, detection of the torsion of the thin steel wire, and detection of the corrosion resistance of the thin steel wire. The diameter of the thin steel wire is detected using a micrometer. The tension of the thin steel wire is detected using a tension tester. The detection method for the tension of the thin steel wire is: for each detection, three thin steel wires are taken and the average value of the tension is taken for the detection result. The torsion of the thin steel wire is detected using a torsion tester. The detection method for the torsion of the thin steel wire is: for each detection, three thin steel wires are taken and the average value of the torsion is taken for the detection result. The corrosion resistance of the thin steel wire is detected using a salt spray corrosion test machine. The detection method for the corrosion resistance of the thin steel wire is: for each detection, three thin steel wires are taken for a salt spray experiment at the same temperature and the same concentration, and the average value of the corrosion fracture time is calculated.

[0047] Finished product packaging includes rust removal from the surface of the string and wrapping and protection of the surface of the string. Rust removal from the surface of the string is carried out by soaking in a hydrochloric acid solution with a concentration of 4%, and the soaking time is 10 min. Wrapping and protection of the surface of the string is carried out by wrapping with long filament plastic fibers in two layers.

[0048] Example Five:

[0049] The present invention provides a method for preparing a string with a long service life, which includes raw material preparation, processing and forming, string performance inspection, and finished product packaging. Raw material preparation includes raw material ratio and preliminary raw material processing. The raw material ratio consists of the following components: 93 parts of iron, 6 parts of carbon, 3.5 parts of silicon, 5 parts of manganese, 0.15 parts of titanium, 0.03 parts of zirconium, 2 parts of additive one, and 2 parts of additive two. Additive one is a process additive, and additive two is a stability additive. The preliminary raw material processing uses a melting machine to melt and mix the above raw materials. The melting temperature of the melting machine is 2750 °C, and the melting time is 4.5 h. The molten mixture is then extruded into a thick steel wire, and the diameter of the extruded thick steel wire is 8 mm.

[0050] Processing and forming includes drawing of the thick steel wire, heat treatment of the thick steel wire, and chemical treatment of the thin steel wire. The drawing of the thick steel wire uses a drawing machine to draw the thick steel wire into a thin steel wire. The heat treatment of the thick steel wire uses annealing to perform an annealing operation on the thick steel wire. The chemical treatment of the thin steel wire is used to perform carburizing on the drawn and heat-treated steel wire.

[0051] String performance inspection includes detection of the diameter of the thin steel wire, detection of the tension of the thin steel wire, detection of the torsion of the thin steel wire, and detection of the corrosion resistance of the thin steel wire. The detection of the diameter of the thin steel wire is performed using a micrometer. The detection of the tension of the thin steel wire is performed using a tension tester. The detection method for the tension of the thin steel wire is as follows: Each time, three thin steel wires are taken for detection, and the average value of the tension is taken for the detection result. The detection of the torsion of the thin steel wire is performed using a torsion tester. The detection method for the torsion of the thin steel wire is as follows: Each time, three thin steel wires are taken for detection, and the average value of the torsion is taken for the detection result. The detection of the corrosion resistance of the thin steel wire is performed using a salt spray corrosion test machine. The detection method for the corrosion resistance of the thin steel wire is as follows: Each time, three thin steel wires are taken for the salt spray experiment at the same temperature and the same concentration, and the average value of the corrosion fracture time is calculated.

[0052] Finished product packaging includes rust removal on the surface of the string and wrapping and protection on the surface of the string. Rust removal on the surface of the string is performed by soaking in a hydrochloric acid solution with a concentration of 4%, and the soaking time is 10 min. Wrapping and protection on the surface of the string is performed by wrapping with long filament plastic fibers twice.

[0053] Example six:

[0054] The present invention provides a method for preparing a string with a long service life, including raw material preparation, processing and shaping, string performance inspection, and finished product packaging. Raw material preparation includes raw material ratio and preliminary raw material processing. The raw material ratio consists of the following components: 93 parts of iron, 6 parts of carbon, 3.5 parts of silicon, 5 parts of manganese, 0.15 parts of titanium, 0.03 parts of zirconium, 2 parts of additive one, and 3 parts of additive two. Additive one is a process additive, and additive two is a stability additive. The preliminary raw material processing uses a melting machine to melt and mix the above raw materials. The melting temperature of the melting machine is 2750 °C, and the melting time is 4.5 h. The molten and mixed mixture is then extruded into a thick steel wire, and the diameter of the extruded thick steel wire is 8 mm.

[0055] Processing and shaping includes drawing of the thick steel wire, heat treatment of the thick steel wire, and chemical treatment of the thin steel wire. The drawing of the thick steel wire uses a drawing machine to draw the thick steel wire into a thin steel wire. The heat treatment of the thick steel wire uses annealing to perform an annealing operation on the thick steel wire. The chemical treatment of the thin steel wire is used to perform a carburizing operation on the drawn and heat-treated steel wire.

[0056] String performance inspection includes detection of the diameter of the thin steel wire, detection of the tension of the thin steel wire, detection of the torsion of the thin steel wire, and detection of the corrosion resistance of the thin steel wire. The detection of the diameter of the thin steel wire is performed using a micrometer. The detection of the tension of the thin steel wire is performed using a tension tester. The detection method for the tension of the thin steel wire is as follows: Each time, three thin steel wires are taken for detection, and the average value of the tension is taken for the detection results. The detection of the torsion of the thin steel wire is performed using a torsion tester. The detection method for the torsion of the thin steel wire is as follows: Each time, three thin steel wires are taken for detection, and the average value of the torsion is taken for the detection results. The detection of the corrosion resistance of the thin steel wire is performed using a salt spray corrosion test machine. The detection method for the corrosion resistance of the thin steel wire is as follows: Each time, three thin steel wires are taken for the same-temperature and same-concentration salt spray experiment, and the average value of the corrosion fracture time is calculated.

[0057] Finished product packaging includes rust removal on the surface of the string and wrapping and protection on the surface of the string. Rust removal on the surface of the string is performed by soaking in a hydrochloric acid solution with a concentration of 4%, and the soaking time is 10 min. Wrapping and protection on the surface of the string is performed by wrapping with long filament plastic fibers in two layers.

[0058] Example Seven:

[0059] The present invention provides a method for preparing a string with a long service life, including raw material preparation, processing and forming, string performance inspection, and finished product packaging. Raw material preparation includes raw material ratio and primary raw material processing. The raw material ratio consists of the following components: 93 parts of iron, 6 parts of carbon, 3.5 parts of silicon, 5 parts of manganese, 0.15 parts of titanium, 0.03 parts of zirconium, 3 parts of additive one, and 1 part of additive two. Additive one is a process additive, and additive two is a stability additive. The primary raw material processing uses a melting machine to melt and mix the above raw materials. The melting temperature of the melting machine is 2750 °C, and the melting time is 4.5 h. The molten mixture is then extruded into a thick steel wire, and the diameter of the extruded thick steel wire is 8 mm.

[0060] Processing and forming includes drawing of the thick steel wire, heat treatment of the thick steel wire, and chemical treatment of the thin steel wire. The drawing of the thick steel wire uses a drawing machine to draw the thick steel wire into a thin steel wire. The heat treatment of the thick steel wire uses annealing to perform an annealing operation on the thick steel wire. The chemical treatment of the thin steel wire is used to perform carburizing on the drawn and heat-treated steel wire.

[0061] String performance inspection includes detection of the diameter of the thin steel wire, detection of the tension of the thin steel wire, detection of the torsion of the thin steel wire, and detection of the corrosion resistance of the thin steel wire. The detection of the diameter of the thin steel wire is performed using a micrometer. The detection of the tension of the thin steel wire is performed using a tension tester. The detection method for the tension of the thin steel wire is: each time three thin steel wires are taken for detection and the average value of the tension is taken for the detection result. The detection of the torsion of the thin steel wire is performed using a torsion tester. The detection method for the torsion of the thin steel wire is: each time three thin steel wires are taken for detection and the average value of the torsion is taken for the detection result. The detection of the corrosion resistance of the thin steel wire is performed using a salt spray corrosion test machine. The detection method for the corrosion resistance of the thin steel wire is: each time three thin steel wires are taken for the same-temperature and same-concentration salt spray experiment, and the average value of the corrosion fracture time is calculated.

[0062] Finished product packaging includes rust removal on the surface of the string and wrapping protection on the surface of the string. Rust removal on the surface of the string is performed by soaking in a hydrochloric acid solution with a concentration of 4%, and the soaking time is 10 min. Wrapping protection on the surface of the string is performed by wrapping with two layers of filament plastic fibers.

[0063] Example VIII:

[0064] The present invention provides a method for preparing a string with a long service life, which includes raw material preparation, processing and shaping, string performance inspection, and finished product packaging. Raw material preparation includes raw material ratio and primary processing of raw materials. The raw material ratio consists of the following components: 93 parts of iron, 6 parts of carbon, 3.5 parts of silicon, 5 parts of manganese, 0.15 parts of titanium, 0.03 parts of zirconium, 3 parts of additive one, and 2 parts of additive two. Additive one is a process additive, and additive two is a stability additive. The primary processing of raw materials uses a melting machine to melt and mix the above raw materials. The melting temperature of the melting machine is 2750 °C, and the melting time is 4.5 h. The melted and mixed mixture is then extruded into a thick steel wire, and the diameter of the extruded thick steel wire is 8 mm.

[0065] Processing and shaping includes drawing of the thick steel wire, heat treatment of the thick steel wire, and chemical treatment of the thin steel wire. The drawing of the thick steel wire uses a drawing machine to draw the thick steel wire into a thin steel wire. The heat treatment of the thick steel wire uses annealing to perform an annealing operation on the thick steel wire. The chemical treatment of the thin steel wire is used to perform carburizing on the drawn and heat-treated steel wire.

[0066] String performance inspection includes detection of the diameter of the thin steel wire, detection of the tension of the thin steel wire, detection of the torsion of the thin steel wire, and detection of the corrosion resistance of the thin steel wire. The detection of the diameter of the thin steel wire is performed using a micrometer. The detection of the tension of the thin steel wire is performed using a tension tester. The detection method for the tension of the thin steel wire is: each time three thin steel wires are taken for detection and the average value of the tension is taken for the detection result. The detection of the torsion of the thin steel wire is performed using a torsion tester. The detection method for the torsion of the thin steel wire is: each time three thin steel wires are taken for detection and the average value of the torsion is taken for the detection result. The detection of the corrosion resistance of the thin steel wire is performed using a salt spray corrosion test machine. The detection method for the corrosion resistance of the thin steel wire is: each time three thin steel wires are taken for the same-temperature and same-concentration salt spray experiment, and the average value of the corrosion fracture time is calculated.

[0067] Finished product packaging includes rust removal on the surface of the string and wrapping protection on the surface of the string. Rust removal on the surface of the string is performed by soaking in a hydrochloric acid solution with a concentration of 4%, and the soaking time is 10 min. Wrapping protection on the surface of the string is performed by wrapping with two layers of long filament plastic fibers.

[0068] Example Nine:

[0069] The present invention provides a method for preparing a string with a long service life, which includes raw material preparation, processing and shaping, string performance inspection, and finished product packaging. Raw material preparation includes raw material ratio and preliminary raw material processing. The raw material ratio consists of the following components: 93 parts of iron, 6 parts of carbon, 3.5 parts of silicon, 5 parts of manganese, 0.15 parts of titanium, 0.03 parts of zirconium, 3 parts of additive one, and 3 parts of additive two. Additive one is a process additive, and additive two is a stability additive. Preliminary raw material processing uses a melting machine to melt and mix the above raw materials. The melting temperature of the melting machine is 2750 °C, and the melting time is 4.5 h. The molten and mixed mixture is then extruded into a thick steel wire, and the diameter of the extruded thick steel wire is 8 mm.

[0070] Processing and shaping includes drawing of the thick steel wire, heat treatment of the thick steel wire, and chemical treatment of the thin steel wire. Drawing of the thick steel wire uses a drawing machine to draw the thick steel wire into a thin steel wire. Heat treatment of the thick steel wire uses annealing to perform an annealing operation on the thick steel wire. Chemical treatment of the thin steel wire is used to perform carburizing on the drawn and heat-treated steel wire.

[0071] String performance inspection includes detection of the diameter of the thin steel wire, detection of the tension of the thin steel wire, detection of the torsion of the thin steel wire, and detection of the corrosion resistance of the thin steel wire. Detection of the diameter of the thin steel wire is performed using a micrometer. Detection of the tension of the thin steel wire is performed using a tension tester. The detection method for the tension of the thin steel wire is: each time three thin steel wires are taken for detection and the average value of the tension is taken for the detection result. Detection of the torsion of the thin steel wire is performed using a torsion tester. The detection method for the torsion of the thin steel wire is: each time three thin steel wires are taken for detection and the average value of the torsion is taken for the detection result. Detection of the corrosion resistance of the thin steel wire is performed using a salt spray corrosion test machine. The detection method for the corrosion resistance of the thin steel wire is: each time three thin steel wires are taken for the same-temperature and same-concentration salt spray experiment, and the average value of the corrosion fracture time is calculated.

[0072] Finished product packaging includes rust removal on the surface of the string and wrapping protection on the surface of the string. Rust removal on the surface of the string is performed by soaking in a hydrochloric acid solution with a concentration of 4%, and the soaking time is 10 min. Wrapping protection on the surface of the string is performed by wrapping with long filament plastic fibers in two layers.

[0073] The following is a data table of string performance inspection for each embodiment:

[0074] Each embodiment Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 Embodiment 6 Embodiment 7 Embodiment 8 Embodiment 9 Maximum tension / KN 1.61 1.42 1.48 1.43 1.65 1.51 1.49 1.15 1.69 Maximum torque / KN 1.23 1.09 1.16 1.09 1.25 1.19 1.17 1.2 1.27 Corrosion fracture time / h 46.3 49.4 52.8 46.2 49.5 52.9 46.2 49.4 53

[0075] This method has a complete and reliable process. Adding a process additive and a stability additive during raw material preparation can greatly increase the maximum tension and maximum torsion of the string, thereby increasing the strength and deformation ability of the string itself. When the ratio of the process additive to the stability additive is the same, the strength and deformation ability of the string itself can be further increased. Moreover, by adding the stability additive, the antioxidant ability of the string itself is increased, preventing hydrolysis or deterioration, and greatly increasing the service life;

[0076] The drawing of thick steel wires and the heat treatment of thick steel wires are carried out reciprocally. During the process of drawing the steel wires multiple times, annealing treatment is carried out multiple times to ensure the stability during the drawing process and the overall strength of the strings.

[0077] Through the performance inspection of the strings, the diameter, maximum tension, maximum torsion and corrosion resistance of the fine steel wires can be detected, which is convenient for distinguishing qualified products and greatly increases the qualified rate of the strings.

[0078] The surface of the strings is derusted by soaking in hydrochloric acid solution to ensure the neatness of the wrapped long filament plastic fibers. By wrapping the long filament plastic fibers, it can not only increase the feel of plucking the strings, but also reduce the contact between the steel wires and the air, further playing a role in protecting the strings.

[0079] The above are only the preferred embodiments of the present application and are not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a musical instrument string with a long service life, comprising raw material preparation, processing and forming, musical instrument string performance inspection and finished product packaging, characterized in that: The raw material preparation includes raw material proportioning and raw material primary processing, wherein the raw material proportioning includes the following components: 90-95 parts of iron, 3-8 parts of carbon, 2.5-4.5 parts of silicon, 2-7 parts of manganese, 0.1-0.2 parts of titanium, 0.01-0.04 parts of zirconium, 1-3 parts of auxiliary agent 1 and 1-3 parts of auxiliary agent 2, and the raw material primary processing adopts a melting machine to melt and mix the above raw materials, and the molten mixed mixture is then extruded to form a thick steel wire; The processing and shaping includes drawing of thick steel wire, heat treatment of thick steel wire and chemical treatment of thin steel wire; The string performance test includes fine steel wire diameter test, fine steel wire tension test, fine steel wire torsion test and fine steel wire corrosion resistance test; The finished product packaging includes rust removal on the surface of the strings and wrapping and protection of the surface of the strings.

2. A method for preparing a musical string with a long service life according to claim 1, characterized in that: The first auxiliary agent is a process auxiliary agent, and the second auxiliary agent is a stability auxiliary agent.

3. The method for preparing a musical string with a long service life according to claim 1, characterized in that: The melting temperature of the melting machine is 2400-2900° C., and the melting time is 4-5 hours. The diameter of the extruded thick steel wire is 6-10 mm.

4. The method for preparing a musical string with a long service life according to claim 1, characterized in that: The drawing of the thick steel wire adopts a drawing machine to draw the thick steel wire into a thin steel wire, the heat treatment of the thick steel wire adopts annealing to anneal the thick steel wire, the drawing of the thick steel wire and the heat treatment of the thick steel wire are performed reciprocatingly, and the chemical treatment of the thin steel wire is used to carburize the drawn and heat-treated steel wire.

5. The method for preparing a musical string with a long service life according to claim 4, characterized in that: The thick steel wire is drawn for multiple times until the diameter of the steel wire reaches 1 mm. The heat treatment annealing temperature of the thick steel wire is 600-700° C., and the cooling temperature is room temperature.

6. The method for preparing a musical string with a long service life according to claim 1, characterized in that: The diameter of the thin steel wire is detected by a micrometer, the tension of the thin steel wire is detected by a tension testing machine, the torsion of the thin steel wire is detected by a torsion testing machine, and the corrosion resistance of the thin steel wire is detected by a salt spray corrosion testing machine.

7. A method for preparing a musical string with a long service life according to claim 6, characterized in that: The thin steel wire diameter detection standard is: the error between the diameter of the thin steel wire at each point in the axial direction and the 1mm standard diameter is less than 1%. The thin steel wire tension detection method is: take three thin steel wires for each detection and take the average tension value of the detection results. The thin steel wire torsion detection method is: take three thin steel wires for each detection and take the average torque value of the detection results. The thin steel wire corrosion resistance detection method is: take three thin steel wires for each detection to conduct salt spray tests at the same temperature and concentration, and calculate the average corrosion fracture time.

8. The method for preparing a musical string with a long service life according to claim 1, characterized in that: The rust removal on the surface of the strings is carried out by soaking in dilute hydrochloric acid, and the surface wrapping and protection of the strings is carried out by wrapping the surface of the strings with filament plastic fibers.

9. The method for preparing a musical string with a long service life according to claim 8, characterized in that: The rust removal of the strings is carried out by soaking in a hydrochloric acid solution with a concentration of 4%, and the soaking time is 10 minutes. The surface of the strings is wrapped and protected by two layers of filament plastic fibers.

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