A duplex stainless steel manufacturing apparatus and a method of manufacturing duplex stainless steel by wire twisting additive technology

Abstract

The application discloses a preparation equipment of duplex stainless steel and a method for preparing duplex stainless steel through twisted wire additive technology, and the technical scheme points adopt high-energy plasma arc as a heat source of metal additive manufacturing, melt a duplex stainless steel twisted wire which takes a middle wire as a center wire and has multiple wires rotatingly wound and twisted around the center wire, and directly twist and convey the twisted wire through the equipment; the combination composition and performance of the prepared duplex stainless steel parts are adjusted by adjusting the composition of the twisted wire; meanwhile, the energy output of the plasma arc is adjusted by changing the working current intensity and the wire feeding speed of the welding machine, thereby affecting the cladding forming condition of the wire material; the additive manufacturing using the twisted wire can significantly improve the forming efficiency; the duplex stainless steel single wire surfacing forming has the shortcomings of low efficiency and poor forming, the additive manufacturing using the duplex stainless steel twisted wire is uniform, the forming result is good, the additive efficiency of the duplex stainless steel is improved, and the cost is greatly reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of stainless steel preparation and equipment, in particular to a preparation equipment for duplex stainless steel and a method for preparing duplex stainless steel through wire twisting additive technology. BACKGROUND

[0002] Duplex stainless steel (DSSs) is the latest one in the stainless steel series, a work hardenable alloy, and has excellent corrosion resistance to most corrosive environments. It can provide an excellent combination of mechanical properties and corrosion resistance, so the duplex stainless steel (DSS) DSSs in corrosive environments, such as shipbuilding, ocean engineering, chemical industry, papermaking, pulp and petrochemical industry, are increasingly concerned.

[0003] And the additive manufacturing of duplex stainless steel is integrated forming, that is, based on the discrete-accumulation principle, a part is directly manufactured by three-dimensional data driving. The material generally used in the additive manufacturing of duplex stainless steel is a single welding wire, so there are disadvantages such as low cladding efficiency and utilization rate. As a new type of welding wire that has been widely studied in recent years, twisted wire has the advantages of high additive efficiency and saving of electric energy when used as a welding wire for additive manufacturing. Therefore, the application solves how to apply the twisted wire technology to the preparation of duplex stainless steel to solve the problems existing in the preparation of the single welding wire.

[0004] Meanwhile, in the prior art, the twisted wire is generally prepared in advance by a twisting machine. According to the patent number (CN202211677874.1) of a multi-strand twisted wire manufacturing equipment based on cold welding technology, the equipment includes a wire feeding mechanism, a wire twisting mechanism and a wire collecting mechanism. During preparation, one end of the multi-welding wire is clamped, and then the wire spool wound with the welding wire is rotated around the center under the action of the rotating unit, so that the welding wire is wound to form the twisted wire. However, the following problems exist in the advance preparation of the twisted wire. In order to avoid the influence of insufficient twisted wire on production during the preparation of stainless steel, there is a problem of excessive preparation of twisted wire, which causes waste of twisted wire and increases the production cost.

[0005] Meanwhile, most of the existing twisted wire conveying equipment realizes the conveying of the twisted wire through the rolling of the upper and lower wire feeding wheels. However, the wire feeding wheel has the following problems: during the initial feeding of the wire, the user needs to manually thread the twisted wire through the box. Since there are many parts inside the box, the operation space inside is not enough, which makes the operation more troublesome. SUMMARY

[0006] In order to solve the above problems, the application provides a duplex stainless steel preparation equipment and a duplex stainless steel preparation method by twisting wire additive technology, which can realize stable duplex stainless steel additive manufacturing, high efficiency, and can manufacture large parts, and has good forming effect; meanwhile, through improvement of the equipment, material waste in the production process is reduced, initial wire threading is facilitated, and efficiency is improved.

[0007] In order to achieve the above-mentioned purpose, the application adopts the technical scheme of a duplex stainless steel preparation equipment, which comprises a wire twisting assembly, the wire twisting assembly comprises a support frame, a disc connected with a power device is rotationally arranged on the support frame, and a plurality of wire releasing discs are fixed on one side of the disc and are distributed in a circumferential direction with the center of the disc as the center; the equipment further comprises a fixed part for clamping a plurality of welding wires; and the equipment is characterized in that it further comprises a welding assembly and a wire feeding assembly located between the welding assembly and the wire twisting assembly.

[0008] The wire feeding assembly comprises a conveying mechanism and a wire feeder matched with the welding assembly; the wire feeder is located on one side of the welding assembly and is used for feeding the twisted wire to the welding assembly; the conveying mechanism comprises a hollow box body, the box body is provided with a feeding port corresponding to the fixed part and a discharging port corresponding to the wire feeder; a pair of upper and lower transmission chain groups are arranged in the box body, a plurality of clamping plate groups formed by a plurality of pressing plates are arranged on the pair of transmission chain groups, a feeding channel for clamping the twisted wire is formed between the upper and lower clamping plate groups, and a driving member is further arranged; when the pair of transmission chain groups move, the driving member drives the pair of clamping plate groups to move towards the feeding channel so as to clamp the twisted wire, and the twisted wire is fed from the feeding port to the discharging port along with the transmission chain group.

[0009] The application further comprises that the transmission chain group comprises a pair of chains connected to both sides of the box body through sprockets; the clamping plate group comprises a left clamping plate group and a right clamping plate group arranged on the pair of chains respectively, and the left clamping plate group and the right clamping plate group are arranged symmetrically.

[0010] The application further comprises that the left clamping plate group and the right clamping plate group each comprise a plurality of cam jacks corresponding to chain links on the chains and slidably connected to the chain links, one end of the cam jacks relative to the feeding channel is slidably provided with a pressing plate, a first spring for driving the pressing plate to extrude the twisted wire is arranged between the pressing plate and the cam jack, and the driving member comprises a cam frame arranged on the side wall of the box body and used for driving the cam jacks to move relative to the feeding channel, and a second spring for driving the cam jacks to abut against the cam frame.

[0011] The application further comprises that the pressing plate comprises a sleeve slidably matched with the cam jack, one end of the sleeve relative to the feeding channel is provided with an arc-shaped clamping portion, the clamping portion is provided with a connecting portion extending towards the feeding channel at the top, and the connecting portions correspondingly arranged on the left clamping plate group and the right clamping plate group are arranged alternately.

[0012] The cam rod end is further provided with a pulley abutting against the cam frame.

[0013] The cam frame comprises a driving section transversely arranged on the inner wall of the box body and in sliding fit with the end of the cam rod, and the two ends of the driving section are provided with disengaging sections respectively located at the discharge port and the feeding port for driving the cam rod to move the pressing plate away from the twisted wire.

[0014] The pressing plate is wrapped with rubber on one side relative to the twisted wire.

[0015] The fixed part is arranged at the feeding port and comprises a pair of pressing wheels distributed above and below, and the pressing wheel located above is connected with the box body through a screw rod and can slide up and down.

[0016] A dual-phase stainless steel preparation equipment and a method for manufacturing dual-phase stainless steel, characterized in that the method comprises the following steps:

[0017] 1) According to the requirements of the project, select the required dual-phase stainless steel welding wire into the twisted wire assembly (1), and perform the twisting operation by the equipment;

[0018] 2) According to the specification of the twisted wire material, the initial size of the feeding channel (315) is adjusted by adjusting the size diameter of the pulley, so as to adapt to the specification of the twisted wire;

[0019] 3) The end of the dual-phase stainless steel twisted wire is placed into the feeding port (311) of the conveying mechanism (31), so that it is pressed by the pressing wheel (6), the pressing wheel (6) can clamp the twisted wire, then the transmission chain group (313) is started to make the twisted wire pass through the feeding channel (315), and then the wire feeder (32) is used to convey the twisted wire to the gun port of the welding gun (21); the wire feeding speed is 0.8 m / min, the inert gas (such as argon) is used as the protective gas, the working current is 100 A, and the protective gas flow rate is set to 25 L / min;

[0020] 4) The four corners of the 304 stainless steel base plate (23) are fixed by the clamp on the welding workbench (22) in the welding assembly (2), and the surface is polished to be smooth by the angle grinder group;

[0021] 5) The wire feeder (32) is adjusted to a suitable position according to the mechanical pair on the mechanical arm, and then the distance (the length of the main line, generally 10-15 mm) and the wire feeding angle (generally 30°-60°) of the twisted wire material to the welding gun (21) are adjusted;

[0022] 6) The lifting of the plasma arc mechanical arm is controlled to determine the appropriate additive data;

[0023] 7) the data obtained in step 5) is drawn into a model by two-dimensional software, the model is converted into corresponding program parameters by additive manufacturing software, the appropriate path of printing is determined, and the path data is exported to the robot system;

[0024] 8) start the equipment, and it can be determined that all the equipment is in good condition and can work normally by observing whether all the computer indicator lights are green;

[0025] 9) run the equipment, and start 3D printing of twisted wire stainless steel;

[0026] 10) after the manufacturing of each layer is completed, the plasma arc welding robot arm drives the welding machine to automatically return to the original position, the sample is cooled by air cooling, and waits for complete bonding between layers, and then the surface just finished is polished in different directions to have a metallic luster by using an angle grinder set;

[0027] 11) before printing the next layer, the current additive height needs to be measured by using a steel ruler, and the corresponding program parameters are changed to prevent collision of the gun and ensure the stability of the additive;

[0028] 12) the part is repeatedly printed according to the above operation cycle, after printing is completed, the part needs to be placed for ten minutes until the whole part is completely bonded, and then the part is taken out after polishing by using an angle grinder set, and a good shaped twisted wire duplex stainless steel part can be obtained.

[0029] According to the above, the beneficial effects of the present application are:

[0030] Compared with the existing duplex stainless steel additive manufacturing technology, the present application adopts the twisted wire technology to improve the cladding efficiency and obtain good forming effect. The multiple welding wires are wound and twisted on the site of the equipment by using the wire feeding assembly, the complexity of the pre-designed twisted wire change is avoided, in addition, the problem of excessive accumulation and waste of twisted wire material is solved. Meanwhile, the operator can adjust before the additive manufacturing starts, and can timely adjust the problems occurring in the manufacturing process.

[0031] And the duplex stainless steel manufactured by the above method and process perfects the whole set of settings required for printing duplex stainless steel parts, effectively improves the equipment manufacturing process, reduces the waste of materials and cost, and improves the efficiency.

[0032] Meanwhile, the twisted wire can be clamped and forwarded by the transmission chain group and the clamping plate group in the conveying mechanism, so that the twisted wire cannot slip during the conveying process. Meanwhile, the upper and lower clamping plate groups form a relatively closed feeding channel, the width of the feeding channel can be adjusted by adjusting the size of the pulley, so that the width of the wire feeding channel can be adjusted, so that the twisted wire of different specifications and diameters can be clamped. In combination with the clamping of the clamping plate group, the user can avoid the soft twisted wire being stuck in the feeding channel during the initial threading, so that the twisted wire can pass through the feeding channel more smoothly and conveniently, and the initial threading is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is the device structure diagram of the embodiment.

[0034] Figure 2 is the cross-sectional view of the conveying mechanism.

[0035] Figure 3 is the side view of the conveying mechanism of the embodiment.

[0036] Figure 4 is Figure 2 is the enlarged view of the clamping plate group.

[0037] Figure 5 is the top view of the clamping plate group of the embodiment.

[0038] Figure 6 is the twisted wire duplex stainless steel sample diagram of the embodiment manufactured by plasma arc additive manufacturing.

[0039] Figure 7 is the metallographic diagram of the twisted wire duplex stainless steel sample of the embodiment manufactured by plasma arc additive manufacturing.

[0040] Figure 8 is the scanning electron microscope of the twisted wire duplex stainless steel sample of the embodiment manufactured by plasma arc additive manufacturing.

[0041] Fig. 1 is a twisted wire assembly; 11 is a support frame; 12 is a disc; 13 is a wire feeding disc; 14 is a variable frequency motor; 15 is a transmission shaft; 16 is a shaft coupling; 2 is a welding assembly; 21 is a welding gun; 22 is a workbench; 23 is a base plate; 3 is a wire feeding assembly; 31 is a conveying mechanism; 310 is a box body; 311 is a feeding port; 312 is a discharging port; 313 is a transmission chain group; 3130 is a rotating shaft; 3131 is a sprocket; 3132 is a chain; 314 is a clamping plate group; 3140 is a cam lifting rod; 3141 is a pressing plate; 4141 is a sleeve; 5141 is a clamping part; 6141 is a connecting part; 3142 is a first spring; 3143 is a second spring; 3144 is a pulley; 315 is a feeding channel; 316 is a cam frame; 3160 is a driving section; 3161 is a disengaging section; 32 is a wire feeder; 6 is a pressing wheel. Detailed Implementation

[0042] The present invention will be further described in detail below with reference to the accompanying drawings.

[0043] like Figures 1-8 As shown, this embodiment discloses a duplex stainless steel preparation equipment, including a wire stranding assembly 1, a welding assembly 2, and a power device connected to the wire stranding assembly 1. A wire feeding assembly 3 is provided between the wire stranding assembly 1 and the welding assembly 2. The wire feeding assembly 3 includes a conveying mechanism 31 connected to the power source and a wire feeder 32 that cooperates with the welding assembly 2. The wire feeder 32 is used to feed the wire strands to the welding assembly 2. The conveying mechanism 31 includes a housing 310, on which an inlet 311 connected to the outlet end of the wire stranding assembly 1 and an outlet 312 connected to the inlet end of the wire feeder 32 are provided.

[0044] In this embodiment, the stranding assembly 1 includes a support frame 11, on which a disc 12 connected to a power device is rotatably mounted. A plurality of wire feeding discs 13 are fixed on the side of the disc 12 facing the wire feeder 32, and the plurality of wire feeding discs 13 are circumferentially distributed with the rotation center of the disc 12 as the center. The power device includes a variable frequency motor 14 connected to the support frame 11 and a transmission shaft 15 disposed at the center of the turntable. The variable frequency motor 14 is connected to the transmission shaft 15 through a coupling 16.

[0045] When the variable frequency motor 14 starts, power is transmitted to the disc 12 via the coupling 16. Wire feeding reels 13 are circumferentially distributed on the side of the disc 12 furthest from the motor 14. Seven welding wires are wound onto the wire feeding reels 13, with one end of each wire clamped between the two clamping rollers 6 of the housing 310. As the disc 12 rotates, the seven welding wires wind together to form strands. These strands are then directly fed to the wire feeder 32 by the wire feeding assembly 3 to cooperate with the welding assembly 2 for welding. This allows for on-site winding and twisting of the welding wires, avoiding the complexity of pre-designed strands. Furthermore, simultaneous production and use solves the problem of excessive waste from the accumulation of stranded wire material.

[0046] Meanwhile, the coupling 16 is a flexible coupling with elastic elements, which can reduce the impact of motor vibration on the stability of the strand.

[0047] The wire feeding assembly 3 includes a conveying mechanism 31 and a wire feeder 32. The wire feeder 32 is located on one side of the welding machine and can move synchronously with the welding machine. The conveying mechanism 31 includes a housing 310. The housing 310 is provided with a feed inlet 311 corresponding to the wire twisting assembly 1 and a feed outlet corresponding to the welding assembly 2. A pair of clamping rollers 6 are provided at the feed inlet 311 of the housing 310, and the height of the upper clamping roller 6 can be adjusted up and down by a screw, thereby adjusting the gap between the two clamping rollers 6 so that it can adapt to wires of different specifications.

[0048] like Figure 3 As shown, a pair of vertically distributed transmission chain groups 313 are also provided inside the housing 310. The transmission chain groups 313 are provided with clamping plate groups 314 formed by several pressure plates 3141. The transmission chain groups 313 include a pair of chains 3132 symmetrically arranged on both sides of the housing 310. The clamping plate groups 314 are arranged on the opposite side of the pair of chains 3132. The pair of chains 3132 are driven by a rotating shaft 3130 and a sprocket 3131. One of the rotating shafts 3130 is connected to a motor. The upper and lower transmission chain groups 313 are synchronously driven by a belt.

[0049] like Figures 3-5 As shown, the clamping plate assembly 314 includes a cam push rod 3140 disposed on a link of the chain 3132. The cam push rod 3140 is slidably connected to the link. A pressure plate 3141 is slidably disposed at one end of the cam push rod 3140 relative to the feeding channel 315. A first spring 3142 is disposed between the pressure plate 3141 and the cam push rod 3140 to drive the pressure plate 3141 to compress the twisted wire. It also includes a clamping plate assembly 3144 disposed on the side wall of the housing 310 for driving the cam push rod 3140 relative to the feeding channel 3132. 5. A sliding cam frame 316 and a second spring 3143 abutting against the cam frame 316. The cam frame 316 includes a drive section 3160 that is laterally arranged on the inner walls of both sides of the housing 310 and abuts against the end of the cam push rod 3140. The two ends of the drive section 3160 are provided with release sections 3161, which are located at the discharge port 312 and the inlet 311, respectively, and are used to drive the cam push rod 3140 to drive the pressure plate 3141 away from the twisted wire.

[0050] During the movement of the pressure plate 3141 driven by the chain 3132, the cam push rod 3140 first enters the drive section 3160 along the release section 3161. After entering the drive section 3160, the cam push rods 3140 on both sides move towards the feeding channel 315, thereby driving the pressure plate 3141 to clamp and press the formed strand. Then, as the pressure plate 3141 is driven forward by the chain 3132, the clamped strand will be driven forward, ultimately achieving the forward conveying of the strand.

[0051] The forward conveying of the stranded wire by the clamping plate group 314 can avoid the slipping between the pressure wheel and the stranded wire, compared with the existing pressure wheel conveying. When the end of the stranded wire formed by the stranded wire assembly 1 passes through the pressure wheel 6, the sprocket 3131 group is started, and then the end of the stranded wire is clamped and moved forward by the clamping plate group 314, so that the stranded wire can automatically pass through the conveying mechanism 31, and the efficiency of the staff is improved.

[0052] As shown in Figure 5 The clamping plate 3141 includes a sleeve 4141 that is in sliding fit with the cam ejector rod 3140. An arc-shaped clamping portion 5141 is arranged at one end of the sleeve 4141 relative to the feeding channel 315. The left and right clamping portions 5141 can clamp and fix the stranded wire. A connecting portion 6141 extends from the top of the clamping portion 5141 to the feeding channel 315. The connecting portions 6141 arranged on the left and right clamping assemblies are staggered. The staggered connecting portions 6141 can increase the distance between the clamping portions 5141 and increase the wrapping area of the stranded wire.

[0053] In use, the initial width of the feeding channel 315 is slightly smaller than the diameter of the stranded wire. The second spring 3143 is arranged between the clamping plate 3141 and the cam ejector rod 3140. When the clamping plate 3141 clamps the stranded wire, the second spring 3143 can press the clamping plate 3141 to the stranded wire to tightly clamp the stranded wire and avoid slipping. The initial setting of the feeding channel 315 is also avoided to be too large or too small to affect the conveying of the stranded wire, which facilitates the adjustment of the staff.

[0054] The welding assembly 2 mainly includes a workbench 22, a base plate 23, and a KUKA robot arm. The welding gun 21 is arranged on the robot arm, which can realize multi-directional rotation and movement and meet the needs of welding additive manufacturing at different angles.

[0055] The protection gas system and the cooling system are also included. The protection gas system includes a gas storage tank and a gas conveying system. The gas storage tank is used to store inert gas used in welding. During welding, the gas conveying system conveys the inert gas to the nozzle of the welding gun 21 to ensure that the welding process is not affected by active gases such as oxygen, thereby enhancing the stability of the welding.

[0056] The cooling system includes a cooling box and a cooling waterway, which are used to reduce the high heat generated by the welding gun 21 during additive manufacturing to prevent the gun from exploding. The cooling system and the protection gas system are both prior art.

[0057] In this embodiment,

[0058] As shown in Figures 6-8The embodiment shown is to use 304 stainless steel as the metal substrate 23, and to use the wire twisting technology shown in the figure to twist and wind seven duplex stainless steel 2209 welding wires. The chemical composition of the duplex stainless steel 2209 welding wire is as follows: Figure 1 (wt. %): 0.024C, 1.63Mn, 0.56Si, 0.018P, 0.005S, 22.23Cr, 8.82Ni, 3.12Mo, 0.13N. The embodiment uses a plasma arc welding method for additive manufacturing.

[0059] (wt. %): 0.024C, 1.63Mn, 0.56Si, 0.018P, 0.005S, 22.23Cr, 8.82Ni, 3.12Mo, 0.13N. The embodiment uses a plasma arc welding method for additive manufacturing.

[0060] 1) According to the requirements of the project, select the duplex stainless steel welding wire that meets the requirements and place it into the wire twisting assembly 1, and perform wire twisting operation by the equipment;

[0061] 2) According to the specifications of the twisted wire, adjust the initial position of the cam frame 316 through the electric telescopic rod 5, so as to adjust the initial size of the feeding channel 315 to adapt to the specifications of the twisted wire;

[0062] 3) Put the end of the duplex stainless steel twisted wire into the feeding port 311 of the conveying mechanism 31, so that it is pressed by the pressing wheel 6, the pressing wheel 6 can clamp the twisted wire, then start the transmission chain group 313 to make the twisted wire pass through the feeding channel 315, and then convey it to the gun port of the welding gun 21 through the wire feeder 32; the wire feeding speed is 0.8 m / min, inert gas (such as argon) is used as the protective gas, the working current is 100 A, and the protective gas flow rate is set to 25 L / min;

[0063] 4) Fix the four corners of the 304 stainless steel substrate 23 through the clamp on the welding workbench 22 in the welding assembly 2, and polish the surface to be smooth with an angle grinder set;

[0064] 5) Adjust the wire feeder 32 to the appropriate position according to the mechanical pair on the mechanical arm, and then adjust the distance (main line length, generally 10-15 mm) and the wire feeding angle (generally 30°-60°) of the twisted wire to the welding gun 21;

[0065] 6) Control the lifting of the plasma arc robot arm to determine the appropriate additive data;

[0066] 7) Draw a model using the data obtained in step 5) with two-dimensional software, convert the model into corresponding program parameters with additive manufacturing software, determine the appropriate path for printing, and export the path data to the robot system;

[0067] 8) Start the equipment, and observe whether all the computer indicator lights are green, which indicates that all the equipment is working properly;

[0068] 9) Run the equipment and start 3D printing of the twisted stainless steel wire;

[0069] 10) After the completion of each layer, the plasma arc welding robot arm drives the welding machine to automatically restore the original position, the sample is cooled by air cooling, and the layer is completely combined, and then the surface just finished is polished in different directions to have a metallic luster by using an angle grinder set;

[0070] 11) Before the next layer is printed, the current additive height is measured by using a steel ruler, and the corresponding program parameters are changed to prevent the collision of the gun and ensure the stability of the additive;

[0071] 12) The part is repeatedly printed according to the above operation cycle, after printing is completed, it needs to be placed for ten minutes, until the whole part is completely combined, and then it is taken out after polishing by using an angle grinder set, so that a good shaped twisted wire duplex stainless steel part can be obtained.

[0072] The above preparation method uses high-energy plasma arc as a heat source for metal additive manufacturing, melts a duplex stainless steel twisted wire which has a central wire and a plurality of wires rotating and winding around the central wire, and the twisted wire is directly twisted and conveyed by the equipment; by adjusting the composition of the twisted wire, including the number and composition of the solid welding wire, the composition and performance of the prepared duplex stainless steel parts are adjusted, at the same time, by changing the working current intensity and the wire feeding speed of the welding machine, the energy output of the plasma arc is adjusted to affect the cladding forming of the wire, and the use of twisted wire for additive manufacturing can significantly improve the forming efficiency; the present application breaks through the shortcomings of low forming efficiency and poor forming of duplex stainless steel single wire overlaying, and uses a plurality of duplex stainless steel welding wires twisted to form a duplex stainless steel twisted wire for uniform additive manufacturing, and the forming result is good, the additive efficiency of duplex stainless steel is improved and the cost is greatly reduced.

[0073] Compared with the existing duplex stainless steel additive manufacturing technology, the present application uses twisted wire technology to improve the cladding efficiency and obtain good forming effect.

[0074] And the above method for manufacturing duplex stainless steel improves the complete set of settings required for printing duplex stainless steel parts, effectively improves the equipment manufacturing process, reduces material waste and cost, and improves efficiency.

[0075] The above only describes the preferred embodiments of the present application and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. within the design concept of the present application should be included in the protection scope of the present application.

Claims

1. A duplex stainless steel preparation device, comprising a twisting assembly (1), the twisting assembly (1) comprising a support frame (11), a disc (12) connected to a power device being rotatably arranged on the support frame (11), and a plurality of wire laying discs (13) being fixed on one side of the disc (12) and being distributed in a circumferential direction with the center of the disc (12) as the center; and a fixed part clamping a plurality of welding wires; characterized in that, The welding assembly (2) and the wire feeding assembly (3) between the welding assembly (2) and the wire twisting assembly (1) are further included; The wire feeding assembly (3) includes a conveying mechanism (31) and a wire feeder (32) matched with the welding assembly (2); the wire feeder (32) is located on one side of the welding assembly (2) and is used for feeding the twisted wire to the welding assembly; the conveying mechanism (31) includes a hollow box (310), the box (310) is provided with a feeding port (311) corresponding to a fixed portion and a discharging port (312) corresponding to the wire feeder (32); a pair of upper and lower transmission chain groups (313) are arranged in the box (310), a pair of the transmission chain groups (313) are each provided with a clamping plate group (314) formed by a plurality of pressing plates (3141), and a feeding channel (315) for clamping the twisted wire is formed between the upper and lower clamping plate groups (314); a driving member is further included, when the pair of transmission chain groups move, the driving member drives the pair of clamping plate groups to move close to the feeding channel so as to clamp the twisted wire, and the twisted wire is fed to the discharging port (312) along with the transmission chain group (313) from the feeding port (311); The transmission chain group (313) includes a pair of chains (3132) connected to the inside of both sides of the box (310) through sprockets (3131); the clamping plate group (314) includes a left clamping plate group and a right clamping plate group which are respectively and slidably arranged on the pair of chains, and the left clamping plate group and the right clamping plate group are symmetrically arranged; The left clamping plate group and the right clamping plate group each include a plurality of cam lift pins (3140) corresponding to chain links on the chains (3132) and slidably connected, one end of the cam lift pin (3140) relative to the feeding channel (315) is slidably provided with a pressing plate (3141), and a first spring (3142) for driving the pressing plate (3141) to extrude the twisted wire is arranged between the pressing plate (3141) and the cam lift pin (3140); the driving member includes a cam frame (316) arranged on the side wall of the box (310) and used for driving the cam lift pin (3140) to move in the direction relative to the feeding channel (315), and a second spring (3143) for driving the cam lift pin (3140) to abut on the cam frame (316).

2. A duplex stainless steel preparation apparatus according to claim 1, characterized in that, The pressing plate (3141) includes a sleeve (4141) slidably matched with the cam lift pin (3140), one end of the sleeve (4141) relative to the feeding channel (315) is provided with an arc-shaped clamping portion (5141), and a connecting portion (6141) extends from the top of the clamping portion (5141) to the feeding channel (315); the connecting portions (6141) correspondingly arranged on the left clamping plate group and the right clamping plate group are arranged in a staggered manner.

3. A duplex stainless steel preparation device according to claim 2, characterized in that The cam lift pin (3140) is rotatably provided with a pulley (3144) abutting against the cam frame (316).

4. A duplex stainless steel preparation apparatus according to claim 1, characterized in that, The cam frame (316) comprises a driving section (3160) transversely arranged on the inner wall of the box (310) and in sliding fit with the end of the cam ejector rod (3140), and the two ends of the driving section (3160) are provided with disengagement sections (3161) respectively located at the discharge port (312) and the feeding port (311) for making the cam ejector rod (3140) drive the pressing plate (3141) away from the skein.

5. A duplex stainless steel preparation apparatus according to claim 2, wherein The pressing plate (3141) is wrapped with rubber on the side opposite to the skein.

6. A duplex stainless steel preparation apparatus according to claim 1, wherein The fixing part is arranged at the feeding port (311) and comprises a pair of pressing wheels (6) distributed upward and downward, the pressing wheel (6) located at the upper side is connected with the box (310) through a screw rod and can slide up and down, and the pressing wheels (6) are wrapped with rubber.

7. A method of manufacturing duplex stainless steel using a duplex stainless steel manufacturing apparatus according to claim 1, comprising using the duplex stainless steel manufacturing apparatus, characterized in that, The method comprises the following steps: 1) According to the requirements of the project, select the duplex stainless steel welding wire meeting the requirements and place it into the skein assembly (1) for skein operation by the equipment; 2) According to the specification of the skein wire, adjust the initial position of the cam frame (316) through the electric telescopic rod (5) to adjust the initial size of the feeding channel (315) so as to adapt the feeding channel (315) to the specification of the skein; 3) Place the end of the duplex stainless steel skein into the feeding port (311) of the conveying mechanism (31) so that it is pressed by the pressing wheel (6), the pressing wheel (6) can clamp the skein, then start the transmission chain set (313) to make the skein pass through the feeding channel (315), and then convey it to the nozzle of the welding gun (21) through the wire feeder (32); the wire feeding speed is 0.8 m / min, the inert gas is used as the protective gas, the working current is 100 A, and the protective gas flow rate is set to 25 L / min; 4) Fix the four corners of the 304 stainless steel base plate (23) through the clamp on the welding workbench (22) in the welding assembly (2), and polish the surface of the base plate (23) to be smooth by using an angle grinder set; 5) Adjust the wire feeder (32) to a suitable position according to the mechanical pair on the mechanical arm, and then adjust the distance of the skein wire to the nozzle of the welding gun (21) and the wire feeding angle; 6) Control the lifting of the plasma arc mechanical arm to determine the appropriate additive data; 7) Draw a model by using two-dimensional software according to the data obtained in step 5), convert the model into corresponding program parameters by using additive manufacturing software, determine the appropriate printing path, and export the path data to the robot system; 8) Start the equipment, and if all the computer indicator lights are green, it indicates that all the equipment is in good condition and can work normally; 9) Run the equipment to start 3D printing of the skein stainless steel; 10) After the manufacturing of each layer is completed, the plasma arc welding robot arm drives the welding gun to automatically return to the original position, the sample is cooled by air cooling, the complete combination between layers is waited, and the surface just printed is polished in different directions to have a metallic luster by using an angle grinder set; 11) Before printing the next layer, the current additive height is measured by using a steel ruler, the corresponding program parameters are changed to prevent the gun from colliding and ensure the stability of the additive. 12) According to the above operation cycle repeatedly printing parts, printing is completed, need to stand for ten minutes, until the entire part is completely combined, with the angle grinder group polishing after taking off, can get better shaped twisted wire dual-phase stainless steel parts.

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