Production process of high-strength fatigue-resistant piano wire

Abstract

The application relates to a high-strength fatigue-resistant piano wire production process and belongs to the technical field of piano wire production. The process comprises the following steps: S1, raw material preparation, S2, melting and casting forming, S3, cold drawing, S4, surface cleaning, S5, heat treatment, S6, cooling treatment, S7, post-treatment and S8, surface treatment; piano wire is subjected to lead bath quenching by adopting a closed lead bath equipment in the step S5, the lead bath equipment comprises a lead bath seat, a lead bath cavity is arranged in the inside of the lead bath seat and is used for containing the lead bath, a feeding port is arranged on one side of the lead bath seat, a sealing door is arranged at the feeding port, an exhaust pipe for discharging lead vapor is arranged on one side of the lead bath seat, and a discharge pipe for discharging the lead bath is arranged on the bottom of one side of the lead bath seat. The lead bath equipment does not need an additional air extraction system, not only the investment of the equipment is reduced and the production cost is lowered, but also the normal discharge of lead vapor can be met, and the safety of the working environment is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of piano wire production, and relates to a high-strength and fatigue-resistant piano wire production process. BACKGROUND

[0002] Piano wire is generally made of high-carbon steel as raw material, and alloy elements such as silicon, manganese, chromium and vanadium are added, and then it is made through processes such as smelting, cold drawing, heat treatment and surface treatment. Piano wire has the characteristics of high carbon content, good hardness and good elasticity, and is not only used for pianos, high-end guitar strings and other musical instruments, but also suitable for making various pressure, tension and torsion springs, and widely used in automobile manufacturing, electrical production equipment, nuclear power, metal products, precision electronic instruments and chemical equipment industries. The precision of the process provides a reliable material basis for many industries.

[0003] In order to improve the strength and fatigue resistance of piano wire, alloy elements are usually added, annealing process is added in the cold drawing process, sorbite structure is obtained by lead bath quenching, residual stress is eliminated by low temperature tempering, and plating and polishing are used. In the process of lead bath quenching of piano wire, the piano wire is generally heated to a certain temperature in the heating furnace, then quickly immersed in the lead bath, and after a period of time, it is taken out of the lead bath and quickly cooled by the cooling equipment. In the traditional process, the piano wire is inserted into the lead bath, and the transition section is easy to contact with the outside air, which causes surface oxidation and affects the performance of the piano wire. In addition, a top cover is usually added above the lead bath to reduce the overflow of lead vapor. However, during the process of inserting the piano wire into the lead bath, lead vapor is easy to leak from the threading hole, so in actual production, a negative pressure exhaust system is connected to the tank body to guide the volatilized lead vapor into a filtering device such as a high-efficiency particulate filter or a wet scrubber for treatment. At the same time, a powerful ventilation system is also installed in the workshop, and a lead concentration real-time monitor is installed to ensure that the lead content in the air is less than 0.05 mg / m³. This traditional lead bath process not only has high energy consumption, resulting in high production cost, but also has great safety hazards. When the ventilation equipment fails, lead vapor is easy to overflow into the workshop in large quantities, causing great harm to the workers. Therefore, we propose a high-strength and fatigue-resistant piano wire production process to solve the above problems. SUMMARY

[0004] Therefore, in order to solve the problems of the traditional lead bath process, such as high energy consumption, high production cost, and great safety hazards, when the ventilation equipment fails, lead vapor is easy to overflow into the workshop in large quantities, causing great harm to the workers, the present application provides a high-strength and fatigue-resistant piano wire production process.

[0005] To achieve the above purpose, the present application provides the following technical solution: comprising the following steps:

[0006] S1, raw material preparation: high carbon steel with carbon content of 0.70%-1.0% is used, and trace amounts of alloying elements are added in a certain proportion;

[0007] S2, melt forming: the raw material is high-temperature melted under vacuum environment, and then the rough wire rod is prepared after continuous casting, hot rolling and rapid cooling;

[0008] S3, cold drawing: the rough wire rod is drawn into the required diameter of the violin steel wire through multi-pass cold drawing, and annealing is interspersed during the cold drawing process;

[0009] S4, surface cleaning: the impurities on the surface of the violin steel wire are removed by pickling, washing and neutralization treatment, and then the surface moisture is dried;

[0010] S5, heat treatment: the cleaned violin steel wire is heated to austenitizing temperature, then rapidly immersed in lead bath under sealed environment, and transformed at 500-550℃ isothermal;

[0011] S6, cooling treatment: after the violin steel wire comes out of the lead bath, inert gas is introduced into the closed cooling channel for rapid cooling;

[0012] S7, post-treatment: the cooled violin steel wire is treated by low-temperature tempering;

[0013] S8, surface treatment: organic coating is coated on the surface of the violin steel wire, and finally polishing is performed to obtain the required violin steel wire.

[0014] Further, the violin steel wire in step S5 is subjected to lead bath quenching by using a closed lead bath device, the lead bath device comprises a lead bath seat, a lead bath cavity is formed in the inside of the lead bath seat for containing the lead bath, a feeding port is formed on one side of the lead bath seat, and a sealing door is arranged at the feeding port, an exhaust pipe for discharging lead vapor is arranged on one side of the lead bath seat, and a discharge pipe for discharging the lead bath is arranged at the bottom of one side of the lead bath seat;

[0015] Further, the lead bath device further comprises an inlet cavity and an outlet cavity, which are symmetrically arranged in the inside of the lead bath seat and respectively located on both sides of the lead bath cavity, an inlet hole is formed below the side of the inlet cavity away from the lead bath cavity, an outlet hole is formed below the side of the outlet cavity away from the lead bath cavity, and the inlet hole and the outlet hole are respectively used for guiding the violin steel wire to enter and exit, a threading hole for guiding the violin steel wire to pass through is formed on the inner wall above the side of the lead bath cavity close to the inlet cavity and the outlet cavity, and a traction guide wheel for guiding and pulling the violin steel wire is arranged in the inlet cavity, the lead bath cavity and the outlet cavity;

[0016] A plurality of electric heating pipes are arranged in the inside of the lead bath cavity for heating the lead bath;

[0017] A stirring mechanism is arranged inside the lead bath cavity for stirring the lead bath.

[0018] Two sets of air extraction mechanisms are symmetrically arranged on the top outer wall of the lead bath seat and are in transmission cooperation with the stirring mechanism for respectively extracting and conveying the gas in the incoming wire cavity and the outgoing wire cavity, so as to achieve the extraction of waste gas and maintain the low pressure state in the incoming wire cavity and the outgoing wire cavity to avoid the leakage of toxic lead vapor.

[0019] Further, the stirring mechanism comprises a sealing stirring shaft penetratingly and rotatably connected to the inner wall of the top of the lead bath cavity, the bottom end of the stirring shaft extends to the inside of the lead bath cavity and is annularly fixed with a plurality of stirring blades, and the top end of the stirring shaft extends above the lead bath seat and is fixedly sleeved with a driven gear.

[0020] Further, the top of one side of the lead bath seat is fixedly connected with a support plate, the top of the support plate is fixedly connected with a stirring motor, and the output shaft of the stirring motor is fixedly sleeved with a driving gear engaged with the driven gear.

[0021] Further, the top outer wall of the lead bath seat is slidingly connected with a sliding frame, one side of the stirring shaft penetrates through the inside of the sliding frame and is fixedly sleeved with an incomplete gear, and the inner walls of the sides of the sliding frame away from each other are both fixedly connected with a straight rack intermittently engaged with the incomplete gear.

[0022] Further, the two sets of air extraction mechanisms each comprise a piston seat fixedly arranged on the top outer wall of the lead bath seat, and the two piston seats are symmetrically arranged on the two sides of the sliding frame, the inside of each of the two piston seats is sealingly and slidingly connected with a piston plate, and the side of each of the two piston plates close to the sliding frame is fixedly connected with a piston rod, and the piston rod penetrates through one side of the piston seat and is fixedly connected with the outer wall of one side of the sliding frame.

[0023] Further, one side of each of the two piston seats away from the sliding frame is fixedly connected with a one-way air inlet pipe, the two one-way air inlet pipes are fixedly penetrated through the top of the lead bath seat and are respectively connected with the incoming wire cavity and the outgoing wire cavity, and one side of the top of each of the two piston seats away from each other is fixedly connected with a one-way air outlet pipe.

[0024] Further, the outer walls of the sides of the lead bath seat away from each other are both fixedly connected with a wire penetrating guide pipe, and the two wire penetrating guide pipes are respectively used in correspondence with the incoming wire hole and the outgoing wire hole to complete the closed guiding and traction of the piano steel wire.

[0025] Further, a set of plugging assemblies for sealing the corresponding wire inlet hole and wire outlet hole are arranged on the two wire guide pipes. The plugging assembly comprises two sealing clamping blocks symmetrically arranged inside the wire guide pipe, both of which are slidingly connected to one side of the outer wall of the lead bath seat and are respectively located on the upper and lower sides of the piano steel wire. An arc-shaped clamping groove matched with the piano steel wire is formed on the side of the two sealing clamping blocks that are close to each other. A sliding rod slidingly penetrating the wire guide pipe is fixedly connected to the side of the two sealing clamping blocks that are away from each other.

[0026] Further, a set of control assemblies for controlling the two sealing clamping blocks to seal and clamp the piano steel wire are arranged between the outer wall of the two wire guide pipes and the lead bath seat. The control assembly comprises a rotating disc rotatably sleeved on the outer wall of the wire guide pipe. An installation cavity is formed in the interior of the rotating disc. The ends of the two sliding rods away from the sealing clamping blocks extend into the installation cavity and are rotatably connected with connecting rods. The other ends of the two connecting rods are rotatably connected with fixing blocks. The two fixing blocks are fixedly connected to the inner wall of the installation cavity.

[0027] Further, the control assembly further comprises a fixed plate fixedly connected to one side of the outer wall of the lead bath seat. An electric push rod is fixedly installed on one side of the fixed plate. The output end of the electric push rod is fixedly connected with a bent plate. The bottom of one side of the bent plate is fixedly connected with a transmission rack. An arc-shaped gear rack is fixedly connected to the outer wall of the rotating disc and is engaged with the transmission rack.

[0028] Further, two pressure gauges respectively for measuring and displaying the air pressure in the wire inlet cavity and the wire outlet cavity are symmetrically arranged on the top of the lead bath seat. The two pressure gauges are electrically connected with the two electric push rods.

[0029] The beneficial effects of the present application are as follows:

[0030] The lead bath seat is respectively sealed and connected with the heating furnace and the cooling channel through the threading conduit, so that the piano steel wire can be sealed and guided to avoid contact with air and prevent surface oxidation. In addition, the lead bath is stirred through the stirring shaft, which can ensure the uniformity of the lead bath temperature, continuously work the two piston seats, extract the gas in the wire inlet cavity and the wire outlet cavity, keep the air pressure in the wire inlet cavity and the wire outlet cavity lower than that in the lead bath cavity and the threading conduit, make the inert gas in the threading conduit and the lead vapor in the lead bath cavity flow into the wire inlet cavity and the wire outlet cavity, and finally extract and outwardly transport the lead vapor through the piston seat. Through the cooperation of the pressure gauge and the electric control of the electric push rod, the two sealing clamps can be controlled to clamp and automatically block the wire inlet hole or the wire outlet hole when the air pressure reaches the set value in special circumstances, so as to effectively prevent the lead vapor from flowing into the heating furnace or the cooling channel. The whole lead bath device does not need an additional air extraction system, which not only reduces the investment of the device and the production cost, but also meets the normal discharge of lead vapor and improves the safety of the working environment.

[0031] Other advantages, objects, and features of the present application will be apparent to those skilled in the art from the following specification, in conjunction with the accompanying drawings. The objects and other advantages of the present application will be realized and attained by the structure particularly pointed out in the specification. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to make the objects, technical solutions and advantages of the present application clearer, the preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings, in which:

[0033] Figure 1 A flow chart of the high-strength and fatigue-resistant piano steel wire production process of the present application;

[0034] Figure 2 A left side view of the overall structure of the lead bath seat in the present application;

[0035] Figure 3 A right side view of the overall structure of the lead bath seat in the present application;

[0036] Figure 4 A perspective view of the overall structure of the present application; Figure 2

[0037] Figure 5 A perspective view of the transmission connection structure of the stirring mechanism and the air extraction mechanism in the present application;

[0038] Figure 6 A top view of the connection structure of the sliding frame in the present application;

[0039] ​Figure 7 is a structural perspective view of the lead bath seat of the present application;

[0040] Figure 8 is a structural perspective view of the connection structure of the threading conduit and the rotating disc of the present application;

[0041] Figure 9 is a structural perspective view of the overall structure of the rotating disc of the present application;

[0042] Figure 10 is a main perspective view of the overall matching structure between the lead bath seat and the front and rear processes of the present application.

[0043] The reference signs are as follows: 1, lead bath seat; 2, lead bath cavity; 3, stirring shaft; 4, wire inlet cavity; 5, wire inlet hole; 6, electric heating pipe; 7, stirring motor; 8, wire outlet cavity; 9, traction guide wheel; 10, driving gear; 11, stirring blade; 12, driven gear; 13, threading hole; 14, wire outlet hole; 15, exhaust pipe; 16, sliding frame; 17, threading conduit; 18, piston seat; 19, piston plate; 20, piston rod; 21, one-way air inlet pipe; 22, one-way air outlet pipe; 23, fixed plate; 24, sealing door; 25, straight rack; 26, incomplete gear; 27, support plate; 28, pressure gauge; 29, discharge pipe; 30, rotating disc; 31, electric push rod; 32, arc-shaped rack; 33, mounting cavity; 34, sliding rod; 35, sealing clamping block; 36, arc-shaped clamping groove; 37, fixed block; 38, connecting rod; 39, bent plate; 40, transmission rack. DETAILED DESCRIPTION

[0044] The present application will be described in detail below through specific embodiments, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the present specification. The present application can also be implemented or applied through other different embodiments, and various modifications or changes can be made to the details in the present specification based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the drawings provided in the following embodiments only schematically illustrate the basic concept of the present application, and the following embodiments and features in the embodiments can be combined with each other without conflict. EMBODIMENT

[0045] As shown in Figure 1 , a high-strength fatigue-resistant piano wire production process comprises the following steps:

[0046] S1, raw material preparation: high-carbon steel with a carbon content of 0.70%-1.0% is used, and trace amounts of alloying elements are added in a certain proportion to refine the grains, improve the hardenability, and improve the anti-tempering softening ability;

[0047] S2, melt casting: the raw materials are smelted at high temperature under vacuum environment, and then the rough wire rod is prepared after continuous casting, hot rolling and rapid cooling;

[0048] S3, cold drawing: the rough wire rod is drawn into the required diameter of the violin steel wire through multi-pass cold drawing, and annealing is inserted in the cold drawing process to eliminate work hardening, restore plasticity and avoid fracture;

[0049] S4, surface cleaning: the impurities on the surface of the violin steel wire are removed by pickling, washing and neutralization treatment, and then the surface moisture is dried;

[0050] S5, heat treatment: the cleaned violin steel wire is heated to austenitizing temperature, then rapidly immersed in lead bath in a sealed environment, and transformed into fine lamellar sorbite structure at 500-550 DEG C;

[0051] S6, cooling treatment: after the violin steel wire is taken out of the lead bath, inert gas is introduced into the closed cooling channel for rapid cooling;

[0052] S7, post-treatment: the cooled violin steel wire is further tempered at low temperature to eliminate residual stress, stabilize the structure and improve fatigue resistance;

[0053] S8, surface treatment: organic coating is coated on the surface of the violin steel wire to enhance corrosion resistance, prolong fatigue life, and finally polishing is carried out to remove surface microcracks and defects and reduce stress concentration risk.

[0054] In one aspect of the embodiment, as shown in Figures 2-10 The lead bath equipment includes a lead bath seat 1, a lead bath cavity 2 is opened in the inside of the lead bath seat 1 for containing the lead bath. A feeding port is opened on one side of the lead bath seat 1 for feeding lead, and a sealing door 24 is arranged at the feeding port. An exhaust pipe 15 for discharging lead vapor is arranged on one side of the lead bath seat 1, and a discharge pipe 29 for discharging the lead bath is arranged at the bottom of one side of the lead bath seat 1. An inlet cavity 4 and an outlet cavity 8 are symmetrically opened in the inside of the lead bath seat 1 and are respectively located on both sides of the lead bath cavity 2. An inlet hole 5 is opened below the side of the inlet cavity 4 away from the lead bath cavity 2, and an outlet hole 14 is opened below the side of the outlet cavity 8 away from the lead bath cavity 2, which are respectively used for guiding the violin steel wire to pass in and out. A threading hole 13 for guiding the violin steel wire to pass through is opened on the inner wall of the side of the lead bath cavity 2 close to the inlet cavity 4 and the outlet cavity 8, and a traction guide wheel 9 for guiding and pulling the violin steel wire is arranged in the inlet cavity 4, the lead bath cavity 2 and the outlet cavity 8. A plurality of electric heating pipes 6 are uniformly arranged in the inside of the lead bath cavity 2 for heating the lead bath.

[0055] The present application can be used in the field of high-strength and fatigue-resistant violin steel wire production, and can also be applied to other fields of the present application. Embodiment

[0056] This embodiment is a further improvement of the previous embodiment: Figures 2-7 As shown, the lead bath device also includes a stirring mechanism provided inside the lead bath chamber 2 for stirring the lead bath. The stirring mechanism includes a stirring shaft 3 that is sealed and rotatably connected to the top inner wall of the lead bath chamber 2. The bottom end of the stirring shaft 3 extends into the interior of the lead bath chamber 2 and is fixedly provided with a plurality of stirring blades 11 in a ring shape. The top end of the stirring shaft 3 extends to the top of the lead bath seat 1 and is fixedly provided with a driven gear 12. A support plate 27 is fixedly connected to the top of one side of the lead bath seat 1. A stirring motor 7 is fixedly connected to the top of the support plate 27. A driving gear 10 that meshes with the driven gear 12 is fixedly provided on the output shaft of the stirring motor 7. When the stirring motor 7 is started, the stirring shaft 3 can be driven to rotate by the meshing movement of the driving gear 10 and the driven gear 12, and the stirring of the lead bath is achieved by the rotation of the stirring blades 11. By stirring the lead bath, the fluidity of the lead bath in the lead bath cavity 2 is improved, which can avoid local temperature gradients. In addition, by evenly distributing multiple electric heating tubes 6 in the lead bath cavity 2, the uniformity of the lead bath temperature can be further ensured by zoned temperature control, thereby ensuring the isothermal transformation of the piano wire and achieving a combination of high strength and high toughness. Example

[0057] This embodiment is a further improvement of the previous embodiment: Figures 2-7 As shown, the lead bath equipment also includes two sets of exhaust mechanisms symmetrically arranged on the top outer wall of the lead bath seat 1, and are in transmission cooperation with the stirring mechanism, which are used to respectively pump out the gas in the inlet chamber 4 and the outlet chamber 8. While achieving the purpose of exhaust gas pumping, it is also used to maintain a low pressure state in the inlet chamber 4 and the outlet chamber 8 to prevent the leakage of toxic lead vapor. The top outer wall of the lead bath seat 1 is slidably connected to a sliding frame 16, and one side of the stirring shaft 3 passes through the interior of the sliding frame 16 and is fixedly sleeved with an incomplete gear 26. The inner wall of the sliding frame 16 on the side away from each other is fixedly connected to a straight rack 25 that intermittently meshes with the incomplete gear 26. When the stirring shaft 3 rotates to stir the lead bath, it can also drive the sliding frame 16 to move back and forth through the intermittent meshing movement of the incomplete gear 26 and the two spur racks 25.

[0058] In one aspect of the embodiment, the two sets of air extraction mechanisms each include a piston seat 18 fixed to the outer wall of the top of the lead bath seat 1, and the two piston seats 18 are symmetrically arranged on both sides of the sliding frame 16. The interiors of the two piston seats 18 are each sealingly and slidingly connected with a piston plate 19. The two piston plates 19 each have a piston rod 20 fixedly connected to the side of the piston plate 19 close to the sliding frame 16. The piston rod 20 penetrates through one side of the piston seat 18 and is fixedly connected to the outer wall of one side of the sliding frame 16. The side of the two piston seats 18 away from the sliding frame 16 is each fixedly connected with a one-way air inlet pipe 21. The two one-way air inlet pipes 21 are each fixedly penetrated through the top of the lead bath seat 1 and are in communication with the wire inlet cavity 4 and the wire outlet cavity 8, respectively. The side of the top of the two piston seats 18 away from each other is each fixedly connected with a one-way air outlet pipe 22. During the agitation of the lead bath, although the temperature of the lead bath can reach a certain balanced state, the agitation will increase the release of lead vapor. Most of the lead vapor will be directly discharged outward through the exhaust pipe 15 to the waste gas treatment equipment, and a small amount of lead vapor will leak into the wire inlet cavity 4 and the wire outlet cavity 8 through the two wire holes 13, respectively. At this time, when the stirring shaft 3 drives the sliding frame 16 to move back and forth, the two piston rods 20 can simultaneously drive the two piston plates 19 to move back and forth, and in the corresponding piston seat 18, the two one-way air inlet pipes 21 can extract the lead vapor leaked into the wire inlet cavity 4 and the wire outlet cavity 8, respectively, and then discharge it outward from the corresponding one-way air outlet pipe 22 to the designated waste gas treatment equipment for treatment. EMBODIMENT

[0059] As a further improvement of the previous embodiment, in the embodiment, the two sets of air extraction mechanisms each include a piston seat 18 fixed to the outer wall of the top of the lead bath seat 1, and the two piston seats 18 are symmetrically arranged on both sides of the sliding frame 16. The interiors of the two piston seats 18 are each sealingly and slidingly connected with a piston plate 19. The two piston plates 19 each have a piston rod 20 fixedly connected to the side of the piston plate 19 close to the sliding frame 16. The piston rod 20 penetrates through one side of the piston seat 18 and is fixedly connected to the outer wall of one side of the sliding frame 16. The side of the two piston seats 18 away from the sliding frame 16 is each fixedly connected with a one-way air inlet pipe 21. The two one-way air inlet pipes 21 are each fixedly penetrated through the top of the lead bath seat 1 and are in communication with the wire inlet cavity 4 and the wire outlet cavity 8, respectively. The side of the top of the two piston seats 18 away from each other is each fixedly connected with a one-way air outlet pipe 22. Figures 2-10As shown, the outer wall of the lead bath seat 1 on the side away from each other is fixedly connected with a threading conduit 17, and the two threading conduits 17 are correspondingly matched with the wire inlet hole 5 and the wire outlet hole 14 for use, to complete the closed guiding traction of the piano steel wire. A set of plugging assemblies for sealing and plugging the corresponding wire inlet hole 5 and wire outlet hole 14 are arranged on the two threading conduits 17. By arranging the two threading conduits 17, the wire inlet hole 5 and the wire outlet hole 14 are respectively located inside the two threading conduits 17. The threading conduit 17 matched with the wire inlet hole 5 is sealingly connected with the wire outlet end of the heating furnace away from the lead bath seat 1, so that the piano steel wire is sealingly guided and pulled in the threading conduit 17 after being heated in the heating furnace, and then enters the wire inlet cavity 4 through the wire inlet hole 5. The threading conduit 17 matched with the wire outlet hole 14 is sealingly connected with the wire inlet end of the closed cooling channel away from the lead bath seat 1, so that the piano steel wire enters the threading conduit 17 from the wire outlet hole 14 after being quenched by the lead bath, and then enters the closed cooling channel in a sealingly pulled manner, to complete the subsequent cooling of the piano steel wire. The piano steel wire is effectively prevented from being in contact with the external air during the lead bath quenching process, the surface of the piano steel wire is prevented from being oxidized, and the performance of the piano steel wire is reduced by being sealingly guided and pulled in and out of the lead bath seat 1. The wire inlet hole 5 and the wire outlet hole 14 can be plugged by the plugging assemblies, and in certain cases, the toxic lead vapor can be prevented from entering the two threading conduits 17 through the wire inlet hole 5 and the wire outlet hole 14 respectively, so that the lead vapor can be prevented from entering the heating furnace and the cooling channel.

[0060] In one aspect of the embodiment, the plugging assembly includes two sealing clamping blocks 35 symmetrically arranged inside the threading conduit 17, the two sealing clamping blocks 35 are slidingly connected to the outer wall of the lead bath seat 1 on one side and are respectively located on the upper and lower sides of the piano steel wire, the side away from each other of the two sealing clamping blocks 35 is fixedly connected with a sliding rod 34 slidingly penetrating the threading conduit 17, and a control assembly for controlling the two sealing clamping blocks 35 to sealingly clamp the piano steel wire is arranged between the outer wall of the two threading conduits 17 and the lead bath seat 1. The two sealing clamping blocks 35 are arranged inside the threading conduit 17, and one set is located on the upper and lower sides of the wire inlet hole 5, and the other set is located on the upper and lower sides of the wire outlet hole 14. When the two sealing clamping blocks 35 are not clamped with the piano steel wire, the piano steel wire can be normally threaded in and out through the wire inlet hole 5 or the wire outlet hole 14 in the threading conduit 17. When the two sealing clamping blocks 35 are clamped with the piano steel wire by the control assembly, since the two arc-shaped clamping grooves 36 are just adapted to the diameter of the piano steel wire, an effective sealing effect can be achieved after clamping, and the wire inlet hole 5 or the wire outlet hole 14 can also be plugged after the two sealing clamping blocks 35 are clamped with each other, to effectively prevent the lead vapor overflowing from the lead bath cavity 2 from entering the threading conduit 17 from the wire inlet cavity 4 and the wire outlet cavity 8.

[0061] In one aspect of the embodiment, the control assembly comprises a rotating disc 30 sleeved on the outer wall of the threading conduit 17, an installation cavity 33 is formed in the interior of the rotating disc 30, two slide rods 34 extend into the installation cavity 33 from the end of the sealing clamp blocks 35 away and are rotationally connected with connecting rods 38, the other end of the two connecting rods 38 are rotationally connected with fixing blocks 37, and the two fixing blocks 37 are fixedly connected on the inner wall of the installation cavity 33. When the rotating disc 30 rotates, the fixing blocks 37 can be rotated and moved, and then the two slide rods 34 can be relatively moved through the connecting rods 38, so as to drive the two sealing clamp blocks 35 to move close to each other, thereby achieving the plugging effect on the corresponding wire inlet hole 5 and wire outlet hole 14. Conversely, when the rotating disc 30 reversely rotates, the plugging effect on the corresponding wire inlet hole 5 and wire outlet hole 14 can be removed, so that the piano steel wire can be normally conveyed. The control assembly further comprises a fixed plate 23 fixedly connected on one side of the outer wall of the lead bath seat 1, an electric push rod 31 fixedly installed on one side of the fixed plate 23, an output end of the electric push rod 31 is fixedly connected with a bent plate 39, one side of the bottom of the bent plate 39 is fixedly connected with a transmission rack 40, and the outer wall of the rotating disc 30 is fixedly connected with an arc-shaped rack 32 engaged with the transmission rack 40. When the electric push rod 31 is started, the bent plate 39 can be moved, thereby driving the transmission rack 40 to move, and through the meshing movement with the arc-shaped rack 32, the rotating effect of the rotating disc 30 is achieved. EMBODIMENT

[0062] As a further improvement of the previous embodiment, in the embodiment, the control assembly further comprises a fixed plate 23 fixedly connected on one side of the outer wall of the lead bath seat 1, an electric push rod 31 fixedly installed on one side of the fixed plate 23, an output end of the electric push rod 31 is fixedly connected with a bent plate 39, one side of the bottom of the bent plate 39 is fixedly connected with a transmission rack 40, and the outer wall of the rotating disc 30 is fixedly connected with an arc-shaped rack 32 engaged with the transmission rack 40. When the electric push rod 31 is started, the bent plate 39 can be moved, thereby driving the transmission rack 40 to move, and through the meshing movement with the arc-shaped rack 32, the rotating effect of the rotating disc 30 is achieved. Figures 2-10As shown, the top of the lead bath seat 1 is provided with two pressure gauges 28 respectively for measuring and displaying the pressure of the air in the incoming line cavity 4 and the outgoing line cavity 8, and the two pressure gauges 28 are respectively electrically controlled and connected with two electric push rods 31. Before the piano steel wire is lead bath quenched, the electric push rod 31 can be started to drive the rotating disc 30 to rotate, thereby driving the two sealing clamping blocks 35 to move close to each other, completing the sealing and clamping of the piano steel wire and the plugging of the corresponding incoming line hole 5 and outgoing line hole 14. At this time, the gas in the incoming line cavity 4 and the outgoing line cavity 8 will not enter the corresponding threading conduit 17 through the incoming line hole 5 and the outgoing line hole 14, and vice versa, the inert gas in the threading conduit 17 will not enter the corresponding incoming line cavity 4 and outgoing line cavity 8. Then the stirring motor 7 can be started to drive the stirring shaft 3 to rotate, so that the sliding frame 16 moves back and forth, thereby making the two piston seats 18 work to extract the gas in the incoming line cavity 4 and the outgoing line cavity 8. Since the piston seat 18 extracts more than the overflow amount of the threading hole 13 each time, after several reciprocating extractions, the gas pressure in the incoming line cavity 4 and the outgoing line cavity 8 will be greater than the gas pressure in the lead bath cavity 2 and the two threading conduits 17. The gas pressure values in the incoming line cavity 4 and the outgoing line cavity 8 are displayed through the corresponding pressure gauges 28, which is convenient for the operator to observe and control. When a certain gas pressure is reached (the gas pressure difference does not need to be particularly large), the electric push rod 31 is started again to make the two sealing clamping blocks 35 release the clamping of the piano steel wire, thereby synchronously releasing the plugging of the corresponding incoming line hole 5 and outgoing line hole 14. Under the condition of gas pressure, the lead vapor in the lead bath cavity 2 will enter the incoming line cavity 4 and the outgoing line cavity 8 from the two threading holes 13, at the same time, the inert gas in the two threading conduits 17 will enter the incoming line cavity 4 and the outgoing line cavity 8 through the incoming line hole 5 and the outgoing line hole 14 (inert gas protection is conducted when the piano steel wire is heated in the heating furnace, and inert gas protection is also conducted in the subsequent sealed cooling channel), and is mixed with the lead vapor for discharge. The piano steel wire is transported in a sealed state, so it will not be in contact with the outside air. In addition, in the process of continuously stirring the lead bath by the stirring shaft 3, the sliding frame 16 is also continuously moved back and forth, thereby making the two piston seats 18 continuously work to continuously pump the gas in the incoming line cavity 4 and the outgoing line cavity 8. Since only the lead vapor in the lead bath cavity 2 flows out from the threading hole 13 in the process of adjusting the pressure, the amount of extracted gas is greater than the amount of incoming gas, thereby being able to adjust the gas pressure in the incoming line cavity 4 and the outgoing line cavity 8 to be lower than the gas pressure in the lead bath cavity 2 and the threading conduit 17.When starting work, the sealing block 35 unblocks the inlet hole 5 and the outlet hole 14, at this time the inlet hole 5 and one of the threading holes 13 can simultaneously enter the gas into the inlet cavity 4, the outlet hole 14 and the other threading hole 13 can simultaneously enter the gas into the outlet cavity 8, at this time the amount of gas entering is equal to the amount of extraction of the piston seat 18, thereby being able to maintain the pressure of the gas pressure in the inlet cavity 4 and the outlet cavity 8, so that the internal gas pressure is always lower than the gas pressure in the lead bath cavity 2 and the threading conduit 17. When the device malfunctions, causing the gas pressure in the inlet cavity 4 or the outlet cavity 8 to approach the normal pressure state, at this time the gas pressure in the threading conduit 17 gradually approaches, in order to prevent lead vapor from entering the threading conduit 17, that is, to avoid lead vapor from entering the heating furnace or the cooling channel, at this time the gas pressure in the inlet cavity 4 and the outlet cavity 8 is measured and displayed by the pressure gauge 28, and when the set value is reached, the corresponding electric push rod 31 can be automatically started to make the two sealing blocks 35 approach each other, completing the clamping of the string and the automatic blocking of the inlet hole 5 or the outlet hole 14. Finally, the device is quickly shut down for maintenance.

[0063] However, as is well known to those skilled in the art, the working principle and wiring method of the electric heating pipe 6, the stirring motor 7, the pressure gauge 28 and the electric push rod 31 are common, which belong to conventional means or common knowledge, and will not be described here. Those skilled in the art can make any selection according to their needs or convenience.

[0064] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions, which should be covered in the scope of the claims of the present application.

Claims

1. A process for producing high-strength and fatigue-resistant piano wire, characterized in that: The steps include: S1. Raw material preparation: Use high carbon steel with a carbon content of 0.70%-1.0%, and add trace alloy elements in a certain proportion; S2, melting and casting: the raw materials are melted at high temperature in a vacuum environment, and then the thick wire is obtained through continuous casting, hot rolling and rapid cooling; S3, cold drawing: The thick wire is drawn into the required diameter of the music wire through multiple cold drawing passes, and annealing is interspersed during the cold drawing process; S4. Surface cleaning: Use pickling, water washing and neutralization to remove impurities on the surface of the piano wire, and then dry the surface moisture; S5. Heat treatment: After the cleaned wire is heated to the austenitizing temperature, it is quickly immersed in a lead bath in a sealed environment and isothermally transformed at 500-550℃; S6. Cooling treatment: After the piano wire comes out of the lead bath, it is rapidly cooled by introducing inert gas into a closed cooling channel; S7, post-processing: the cooled piano wire is then processed by low-temperature tempering; S8, surface treatment: applying an organic coating on the surface of the piano wire, and finally polishing it to obtain the desired piano wire; In step S5, the piano wire is lead-bath quenched using a closed lead-bath device, the lead-bath device comprising a lead-bath seat (1), a lead-bath chamber (2) being provided inside the lead-bath seat (1), a feeding port being provided on one side of the lead-bath seat (1), and a sealing door (24) being provided at the feeding port, an exhaust pipe (15) for discharging lead vapor being provided on one side of the lead-bath seat (1), and a discharge pipe (29) for discharging the lead-bath being provided at the bottom of one side of the lead-bath seat (1); It also includes an inlet cavity (4) and an outlet cavity (8), which are symmetrically arranged inside the lead bath seat (1) and are respectively located on both sides of the lead bath cavity (2); an inlet hole (5) is opened below the side of the inlet cavity (4) away from the lead bath cavity (2); an outlet hole (14) is opened below the side of the outlet cavity (8) away from the lead bath cavity (2), which are respectively used for guiding the piano wire in and out; a threading hole (13) for guiding the piano wire is opened above the inner wall of the lead bath cavity (2) on the side close to the inlet cavity (4) and the outlet cavity (8); and a traction guide wheel (9) for guiding and traction of the piano wire is provided in the inlet cavity (4), the lead bath cavity (2) and the outlet cavity (8); A plurality of electric heating tubes (6), all arranged inside the lead bath cavity (2), for heating the lead bath; A stirring mechanism, disposed inside the lead bath chamber (2), for stirring the lead bath; Two sets of exhaust mechanisms are symmetrically arranged on the top outer wall of the lead bath seat (1) and are driven in conjunction with the stirring mechanism to respectively exhaust the gas in the inlet chamber (4) and the outlet chamber (8). While exhausting the waste gas, they are also used to maintain a low pressure state in the inlet chamber (4) and the outlet chamber (8) to prevent the leakage of toxic lead vapor.

2. A process for producing high-strength, fatigue-resistant music wire according to claim 1, characterized in that: The stirring mechanism comprises a stirring shaft (3) which is sealed and rotatably connected to the top inner wall of the lead bath chamber (2); the bottom end of the stirring shaft (3) extends into the interior of the lead bath chamber (2) and is fixedly provided with a plurality of stirring blades (11) in an annular shape; the top end of the stirring shaft (3) extends above the lead bath seat (1) and is fixedly provided with a driven gear (12); A support plate (27) is fixedly connected to the top of one side of the lead bath seat (1), and a stirring motor (7) is fixedly connected to the top of the support plate (27). A driving gear (10) meshing with a driven gear (12) is fixedly sleeved on the output shaft of the stirring motor (7).

3. The process for producing high-strength and fatigue-resistant music wire according to claim 2, wherein: The top outer wall of the lead bath seat (1) is slidably connected to a sliding frame (16), and one side of the stirring shaft (3) passes through the interior of the sliding frame (16) and is fixedly sleeved with an incomplete gear (26), and the inner wall of the sliding frame (16) on the side away from each other is fixedly connected to a straight rack (25) that intermittently meshes with the incomplete gear (26).

4. The process for producing high-strength and fatigue-resistant music wire according to claim 3, wherein: The two groups of the air extraction mechanism both include a piston seat (18) fixedly arranged on the top outer wall of the lead bath seat (1), and the two piston seats (18) are symmetrically arranged on both sides of the sliding frame (16), the interiors of the two piston seats (18) are sealed and slidably connected to piston plates (19), and the sides of the two piston plates (19) close to the sliding frame (16) are fixedly connected to piston rods (20), and the piston rods (20) pass through one side of the piston seat (18) and are fixedly connected to the outer wall of one side of the sliding frame (16); The two piston seats (18) are fixedly connected to a one-way air inlet pipe (21) on one side away from the sliding frame (16), and the two one-way air inlet pipes (21) are fixedly connected to the top of the lead bath seat (1) and are respectively connected to the inlet cavity (4) and the outlet cavity (8). The tops of the two piston seats (18) are fixedly connected to a one-way air outlet pipe (22) on one side away from each other.

5. The process for producing high-strength and fatigue-resistant music wire according to claim 4, wherein: The outer walls of the lead bath seat (1) on the side away from each other are fixedly connected with a threading conduit (17), and the two threading conduits (17) are respectively used in conjunction with the wire inlet hole (5) and the wire outlet hole (14) to complete the closed guiding and pulling of the piano wire; The two threading conduits (17) are each provided with a set of sealing components for sealing the corresponding wire inlet hole (5) and wire outlet hole (14).

6. The process for producing high-strength and fatigue-resistant music wire according to claim 5, wherein: The blocking assembly includes two sealing clamps (35) symmetrically arranged inside the threading conduit (17), the two sealing clamps (35) are slidably connected to the outer wall of one side of the lead bath seat (1) and are respectively located on the upper and lower sides of the piano wire, and the sides of the two sealing clamps (35) close to each other are each provided with an arc-shaped clamping groove (36) adapted to the piano wire, and the sides of the two sealing clamps (35) away from each other are each fixedly connected to a slide rod (34) that slides through the threading conduit (17); A set of control components for controlling two sealing clamps (35) to seal and clamp the piano wire is provided between the outer walls of the two threading conduits (17) and the lead bath seat (1).

7. The process for producing high-strength and fatigue-resistant music wire according to claim 6, wherein: The control assembly includes a rotating disk (30) rotatably sleeved on the outer wall of the threading conduit (17), an installation cavity (33) is provided inside the rotating disk (30), and two sliding rods (34) extend into the installation cavity (33) at one end away from the sealing clamping block (35) and are rotatably connected to a connecting rod (38), and the other ends of the two connecting rods (38) are rotatably connected to a fixed block (37), and the two fixed blocks (37) are fixedly connected to the inner wall of the installation cavity (33).

8. The process for producing high-strength and fatigue-resistant music wire according to claim 7, wherein: The control assembly further comprises a fixed plate (23) fixedly connected to the outer wall of one side of the lead bath seat (1), an electric push rod (31) is fixedly mounted on one side of the fixed plate (23), an output end of the electric push rod (31) is fixedly connected to a bending plate (39), a bottom of one side of the bending plate (39) is fixedly connected to a transmission rack (40), and an outer wall of the rotating disk (30) is fixedly connected to an arc-shaped rack (32) meshing with the transmission rack (40).

9. The process for producing high-strength and fatigue-resistant music wire according to claim 8, wherein: Two pressure gauges (28) for measuring and displaying the air pressure in the inlet cavity (4) and the outlet cavity (8) are symmetrically provided on both sides of the top of the lead bath seat (1), and the two pressure gauges (28) are electrically controlled and connected to the two electric push rods (31).

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