An electric arc additive manufacturing method for a hydraulic elevator hook

Abstract

The application discloses an electric arc additive manufacturing method of a hydraulic lifting clamp and belongs to the technical field of electric arc additive manufacturing of large metal components. The electric arc additive manufacturing technology is used to replace the traditional casting method to manufacture the hydraulic lifting clamp, the design and manufacturing concept of the traditional product is changed, no mold is needed, and production demand can be quickly responded. According to product demand, the material can be flexibly changed to adjust the part bearing capacity, the performance of the hydraulic lifting clamp is greatly improved, the hydraulic lifting clamp with excellent comprehensive performance is obtained. Meanwhile, after the additive manufacturing printing, the surface or near-surface defects can be repaired by the same method after nondestructive testing, thereby greatly improving the qualified rate of the product, significantly improving the production efficiency and reducing the production cost. Compared with the traditional casting method, the application does not need quenching and tempering heat treatment, and the difficulty of the heat treatment process and the cost difficulty are significantly reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric arc additive manufacturing of large metal components, and particularly relates to an electric arc additive manufacturing method of a hydraulic elevator. BACKGROUND

[0002] The hydraulic elevator belongs to one of the oil and gas lifting equipment, is connected with a lifting ring at the top and is connected with a pipe column at the bottom, and is an automatic wellhead equipment for suspending a pipe column in drilling and well repairing operations. The equipment is mainly composed of a main body, left and right valves, a lock tongue body, a valve, and a lock tongue shaft, and sequentially completes automatic rotation, opening and closing, locking, and floating function actions through a liquid-electric control system.

[0003] At present, the main bearing main body, the left valve, and the right valve of the hydraulic elevator are made of high-strength alloy steel material through precision casting. Since the main body, the left valve, and the right valve of the hydraulic elevator have a relatively complex structure, defects such as cold shut, shrinkage, and porosity are prone to occur in the thin-wall area of the castings in the traditional casting process due to improper setting of exhaust holes and pouring gates, slow pouring speed, and low working temperature. Some defects still have surface cracks after repair welding, resulting in a high scrap rate of the hydraulic elevator casting blanks. At the same time, with the development of ultra-deep well technology, the hydraulic elevator is required to have high bearing capacity and low weight, and the traditional cast steel material is difficult to meet the requirements due to the difficulty in improving the strength. Therefore, the traditional precision cast alloy steel material and the casting process cannot meet the production requirements of the large-load elevator. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide an electric arc additive manufacturing method of a hydraulic elevator, so as to solve the technical problem that the traditional precision cast alloy steel material and the casting process cannot meet the production requirements of the large-load elevator in the prior art.

[0005] In order to achieve the above purpose, the following technical scheme is adopted in the present application:

[0006] An electric arc additive manufacturing method of a hydraulic elevator, comprising the following steps:

[0007] Three-dimensional structure data models of each part of the traditional hydraulic elevator are established respectively, additive manufacturing process analysis and local structure optimization are performed thereon, and welding wires and printing process parameters meeting the requirements are determined;

[0008] The additive manufacturing of the hydraulic elevator is performed according to the optimized three-dimensional structure data models;

[0009] The additive manufactured hydraulic elevator is subjected to nondestructive testing and dimensional inspection.

[0010] Preferably, the three-dimensional structure data model of each part of the traditional hydraulic lifting clamp is analyzed by the additive manufacturing process and the structure is locally optimized, specifically: the boss structure of the left and right valve connecting part is directly taken out during the process design, and the original function is restored by manual repair welding or adding gaskets; the structure of the traditional hydraulic lifting clamp is modified according to the forming strategy of the additive manufacturing hydraulic lifting clamp to obtain a three-dimensional structure data model suitable for additive manufacturing.

[0011] Preferably, after determining the qualified welding wire and printing process parameters:

[0012] A small test block is trial-produced on a carbon steel base by selecting the above materials and processes, and the metallographic, hardness, and mechanical properties are tested according to the technical requirements of the hydraulic lifting clamp design to verify the selection of the additive manufacturing hydraulic lifting clamp material and printing process;

[0013] According to the printing scheme of the hydraulic lifting clamp, different overhanging angle positions are selected for local trial printing, and the printing parameters of the overhanging structure and whether to add support are determined according to the forming quality to complete the design of the overall printing strategy.

[0014] Preferably, the additive manufacturing of the hydraulic lifting clamp specifically includes: importing the optimized three-dimensional structure data model into the additive manufacturing slicing software for blocking and zoning, and generating a control program for the additive manufacturing process control after layer-by-layer slicing to start printing.

[0015] Preferably, the printing process of the hydraulic lifting clamp body includes the following steps:

[0016] S201: Place the carbon steel base on the biaxial positioner, and print the suspended pipe column structure in the hydraulic lifting clamp body upward from the surface of the base along the vertical direction;

[0017] S202: Turn the positioner by 90 degrees, and start printing the left and right valve mounting structure with the side of the suspended pipe column structure as the printing bottom surface, and the printing direction is the vertical direction;

[0018] S203: The positioner is rotated by 180 degrees without changing the turning angle, and the printing of the structure for fixing the hydraulic device on the main body is completed based on the circular arc surface;

[0019] S204: The positioner is turned by ±90 degrees without changing the turning angle, and the printing of the lifting ring suspension structure 204 is completed on both sides respectively;

[0020] S205: Remove the printing completed blank from the positioner, and obtain the blank structure of the main body 2 by removing the base with wire cutting.

[0021] Preferably, the printing process of the left and right valves of the hydraulic lifting clamp includes the following steps:

[0022] S206: Place the carbon steel base on the biaxial positioner, print the left valve upper structure and the right valve upper structure from the surface of the base upwards along the vertical direction;

[0023] S207: Remove the base and measure the three-dimensional topography of the left valve upper structure and the right valve upper structure, obtain the error between the formed size and the three-dimensional model, and finish machining the bottom to completely remove the machining allowance of the bottom surface;

[0024] S208: Turn over the left valve upper structure and the right valve upper structure, fix them on the biaxial positioner, and use manual electric welding to increase support or add inclined pads to fix them, and use the machined surface as the printing base to prepare for printing;

[0025] S209: Complete the printing of the left valve lower structure and the right valve lower structure; remove the blank structure of the left valve and the right valve from the biaxial positioner.

[0026] Preferably, the machining allowance between the printed blank structure and the base is 6-15 mm, and the machining allowance of the remaining surface of the formed part is 3-6 mm.

[0027] Preferably, the printing is completed by using the electric arc additive manufacturing process, the diameter of the welding wire used is 0.8-1.2 mm, the single-layer printing height is 1.5-2 mm, the overlap rate is 40%-60%, the welding gun moving speed is 6-10 mm / s, and the wire feeding speed is 5-8 m / min.

[0028] Preferably, after the additive manufacturing of the hydraulic lifting clamp, it further includes post-processing of the hydraulic lifting clamp, specifically:

[0029] Put the blank structure of each part of the hydraulic lifting clamp into a heat treatment furnace for stress relief annealing treatment, the treatment temperature is 500-650℃, and the time is 2-4 hours; measure the size of each part of the additive manufactured hydraulic lifting clamp, and design a machining scheme for accurate size machining.

[0030] Preferably, the non-destructive testing and size inspection of the additive manufactured hydraulic lifting clamp specifically includes:

[0031] Use ultrasonic, magnetic powder and other methods to perform non-destructive testing on the internal and surface quality respectively; for defects exceeding the standard, after evaluation, if it meets the repair standard, remove the internal defects by machining, use the same additive manufacturing process and equipment to repair the damaged part, and repeat the non-destructive testing until it meets the standard requirements;

[0032] After assembling the hydraulic lifting clamp, place it on the test platform to complete the full-size test verification under 1.5 times the design load, and verify that the load carrying capacity of the additive manufactured hydraulic lifting clamp meets the use requirements.

[0033] Compared with the prior art, the present application has the following beneficial effects:

[0034] The electric arc additive manufacturing method of the hydraulic lifting clamp disclosed in the present application adopts the electric arc additive manufacturing technology to replace the traditional casting method to manufacture the hydraulic lifting clamp, changes the design and manufacturing concept of the traditional product, does not need a mold, and can quickly respond to production requirements; the material can be flexibly changed according to product requirements to adjust the part bearing capacity, greatly improves the performance of the hydraulic lifting clamp, and obtains a hydraulic lifting clamp with excellent comprehensive performance; at the same time, after the additive manufacturing printing, the surface or near-surface defects can be repaired by the same method after nondestructive testing, thereby greatly improving the qualified rate of the product, significantly improving the production efficiency, and reducing the production cost; compared with the traditional casting method, the present application does not need quenching and tempering heat treatment, and significantly reduces the difficulty and cost of the heat treatment process. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The additive manufacturing flowchart of the hydraulic lifting clamp of the present application is shown in the figure;

[0036] Figure 2 The additive manufacturing flowchart of the hydraulic lifting clamp of the embodiment of the present application is shown in the figure;

[0037] Figure 3 The structure schematic diagram of the printing flowchart of the main body of the hydraulic lifting clamp in the present application is shown in the figure;

[0038] Figure 4 The structure schematic diagram of the printing flowchart of the left / right valve of the hydraulic lifting clamp in the present application is shown in the figure.

[0039] Wherein: 1-base; 2-lifting clamp main body; 201-hanging pipe structure; 202-left / right valve mounting structure; 203-fixed hydraulic device structure; 204-lifting ring hanging structure; 3-left valve; 301-left valve upper structure; 302-left valve lower structure; 4-right valve; 401-right valve upper structure; 402-right valve lower structure. DETAILED DESCRIPTION

[0040] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0041] It is to be understood that the terms "first", "second", and the like, used in the description and the claims of the application and the above drawings, are used to distinguish between similar objects, and are not necessarily used to describe a particular sequential or chronological order. It is to be understood that the use of data so designated is not to be construed as limiting of the embodiments of the application described herein to only those embodiments absolutely recited in the specification and claims. Moreover, the terms "include", "have", and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or apparatus that comprises a list of steps or units can not necessarily be limited to those steps or units that are clearly recited, but can include additional steps or units that are not expressly listed or inherent to such process, method, product or apparatus.

[0042] The application will be further described in detail below with reference to the accompanying drawings:

[0043] Referring to Figure 1 The application discloses an electric arc additive manufacturing method of a hydraulic lifting clamp, comprising the following steps:

[0044] S1: three-dimensional structure data models of each part of the traditional hydraulic lifting clamp are respectively established, additive manufacturing process analysis and local structure optimization are performed on the three-dimensional structure data models, and welding wires and printing process parameters meeting the requirements are determined;

[0045] In some embodiments, the additive manufacturing process analysis and local structure optimization of the three-dimensional structure data models of each part of the traditional hydraulic lifting clamp are specifically as follows: the boss structure of the left and right valve and the main body connection part is directly taken out in the process design process, and the original function is restored by means of manual repair welding or adding a gasket; the structure of the traditional hydraulic lifting clamp is modified according to the forming strategy of the additive manufacturing hydraulic lifting clamp, and a three-dimensional structure data model suitable for additive manufacturing is obtained.

[0046] In some embodiments, after the welding wires and printing process parameters meeting the requirements are determined:

[0047] Small test blocks are trial-produced on the carbon steel base body by selecting the above materials and processes, and the test blocks are tested for metallography, hardness and mechanical properties according to the technical requirements of the hydraulic lifting clamp design, so as to verify the selection of the additive manufacturing hydraulic lifting clamp materials and the printing process;

[0048] According to the printing scheme of the hydraulic lifting clamp, different overhanging angle positions are selected for local trial printing, and the printing parameters of the overhanging structure and whether to add support are judged according to the forming quality, and the design of the overall printing strategy is completed.

[0049] S2: additive manufacturing of the hydraulic lifting clamp is performed according to the optimized three-dimensional structure data model;

[0050] In some embodiments, the additive manufacturing of the hydraulic lifting clamp specifically comprises: importing the optimized three-dimensional structure data model into an additive manufacturing slicing software for blocking and zoning, generating a control additive manufacturing process control program after layer-by-layer slicing, and starting printing.

[0051] Further preferably, the printing process of the hydraulic lifting clamp body 2 comprises the following steps:

[0052] S201: Place the carbon steel base on the biaxial positioner, and print the suspension pipe column structure 201 in the hydraulic lifting clamp body 2 upward from the surface of the base along the vertical direction;

[0053] S202: Turn the positioner by 90 degrees, and start printing the left and right valve mounting structure 202 with the side of the suspension pipe column structure 201 as the printing bottom surface, the printing direction being the vertical direction;

[0054] S203: Without changing the turning angle of the positioner, rotate the positioner by 180 degrees, and complete the printing of the structure 203 for fixing the hydraulic device on the body based on the circular surface as the reference surface;

[0055] S204: Without changing the turning angle of the positioner, swing the positioner by ±90 degrees, and complete the printing of the lifting ring suspension structure 204 on both sides respectively;

[0056] S205: Remove the printed blank from the positioner, and obtain the blank structure of the body 2 by removing the base using wire cutting.

[0057] In some embodiments, the machining allowance between the printed blank structure and the base is 6-15 mm, and the machining allowance of the remaining surface of the formed part is 3-6 mm.

[0058] Further preferably, the printing process of the left valve 3 and the right valve 4 of the hydraulic lifting clamp comprises the following steps:

[0059] S206: Place the carbon steel base on the biaxial positioner, and print the left valve upper structure 301 and the right valve upper structure 401 upward from the surface of the base along the vertical direction;

[0060] S207: After removing the base, measure the three-dimensional topography of the left valve upper structure 301 and the right valve upper structure 401, obtain the error between the formed size and the three-dimensional model, and finish machining the bottom to completely remove the machining allowance of the bottom surface;

[0061] S208: After turning the left valve upper structure 301 and the right valve upper structure 401 by 180 degrees, fix them on the biaxial positioner, and use manual electric welding to increase support or add inclined pads to fix them, and prepare to print the surface as the printing base;

[0062] S209: complete the printing of the left valve lower structure 302 and the right valve lower structure 402; remove the blank structure of the left valve 3 and the right valve 4 from the double-axis positioner.

[0063] In some embodiments, the machining allowance between the printed blank structure and the base body is 6-15 mm, and the machining allowance of the remaining surface of the formed piece is 3-6 mm.

[0064] In some embodiments, the printing is completed by using an electric arc additive manufacturing process, the diameter of the welding wire used is 0.8-1.2 mm, the single-layer printing height is 1.5-2 mm, the overlap rate is 40%-60%, the welding gun moving speed is 6-10 mm / s, and the wire feeding speed is 5-8 m / min.

[0065] In some embodiments, after the additive manufacturing of the hydraulic lifting clamp, the method further comprises post-processing of the hydraulic lifting clamp, specifically:

[0066] The blank structure of each component of the hydraulic lifting clamp is placed in a heat treatment furnace for stress relief annealing treatment, the treatment temperature is 500-650℃, and the time is 2-4 hours; the dimensions of each component of the additive manufactured hydraulic lifting clamp are measured, and a mechanical machining scheme is designed for accurate dimension machining.

[0067] S3: non-destructive testing and dimension inspection of the additive manufactured hydraulic lifting clamp.

[0068] In some embodiments, the non-destructive testing and dimension inspection of the additive manufactured hydraulic lifting clamp specifically comprises:

[0069] The internal and surface quality are respectively non-destructively tested by using ultrasonic, magnetic powder and other methods; for the defects exceeding the standard, after evaluation, if the repair standard is met, the internal defects are removed by mechanical machining, the damaged parts are repaired by additive manufacturing using the same additive manufacturing process and equipment, and the non-destructive testing is repeated until the standard requirements are met;

[0070] After the hydraulic lifting clamp is assembled, it is placed on a test platform to complete full-size test verification under 1.5 times the design load, and verify that the load-carrying capacity of the additive manufactured hydraulic lifting clamp meets the use requirements.

[0071] The application adopts the electric arc additive manufacturing technology to replace the traditional casting method to manufacture the hydraulic lifting clamp, changes the design and manufacturing concept of the traditional product, does not need a mold, can quickly respond to production needs, can flexibly change the material to adjust the part bearing capacity according to the product demand, greatly improves the performance of the hydraulic lifting clamp, and obtains the hydraulic lifting clamp with excellent comprehensive performance; meanwhile, after the additive manufacturing printing, the surface or near-surface defects can be repaired by the same method after nondestructive testing, thereby greatly improving the qualified rate of the product, significantly improving the production efficiency, and reducing the production cost; compared with the traditional casting method, the application does not need quenching and tempering heat treatment, and significantly reduces the difficulty and cost of the heat treatment process.

[0072] Embodiment

[0073] Referring to Figure 2 The application provides an electric arc additive manufacturing method of a hydraulic lifting clamp, comprising the following steps:

[0074] (1) Printing process analysis and structure local optimization.

[0075] Three-dimensional models of each part of the traditional hydraulic lifting clamp are respectively established, and additive manufacturing process analysis is performed. Since the structures of the hydraulic lifting clamp and the left and right valves are relatively complex, in order to reduce the problem that the suspended parts are difficult to print in the printing process, the printing direction is controlled in a way of zoned printing and robot + double-axis displacement machine linkage control, so that the printing direction is guaranteed to be a vertical upward growth direction; the zoned printing is based on the principle of the least suspended structure and the smallest suspended angle; since the partial fine structure (boss structure) of the connection part between the left and right valves and the main body is difficult to be directly formed, the boss structure is directly taken out in the printing process design process, and the original function is restored by manual repair welding or adding a gasket. According to the forming strategy of the additive manufacturing hydraulic lifting clamp, the structure of the traditional hydraulic lifting clamp is modified to obtain a three-dimensional structure data model suitable for additive manufacturing.

[0076] (2) Welding material inspection and forming process verification

[0077] According to the design technical requirements of the hydraulic lifting clamp, the welding wire and the printing process parameters meeting the requirements are preliminarily selected; the above materials and processes are selected to trial-produce small test blocks on the carbon steel base, and the metallographic, hardness and mechanical property tests are performed according to the design technical requirements of the hydraulic lifting clamp, so as to verify the selection of the additive manufacturing hydraulic lifting clamp material and the printing process; according to the printing scheme of the hydraulic lifting clamp, the parts with different suspended angles are locally trial-printed, and the printing parameters of the suspended structure and whether to increase the support are judged according to the forming quality, and the design of the overall printing strategy is completed.

[0078] (3) Hydraulic lifting clamp additive manufacturing

[0079] The three-dimensional structure data model of the additive manufacturing is imported into the additive manufacturing slicing software for blocking and zoning, the selected optimized additive manufacturing process is input into the slicing software, and a control additive manufacturing process control program is generated after layer-by-layer slicing, so that printing is prepared to start.

[0080] The printing process of the hydraulic lifting clamp body 2 is as shown in the figure. Figure 3 The carbon steel base is placed on the biaxial positioner, the suspension pipe column structure 201 in the hydraulic lifting clamp body 2 is printed upward from the surface of the base along the vertical direction, the positioner is turned over by 90 degrees, the left and right valve mounting structures 202 are printed starting from the side surface of the suspension pipe column structure 201 as the printing bottom surface, and the printing direction is the vertical direction; the positioner is rotated by 180 degrees without changing the turning over angle, the printing of the structure 203 for fixing the hydraulic device on the body is completed based on the circular surface as the reference surface; the positioner is turned by ± 90 degrees without changing the turning over angle, and the printing of the lifting ring suspension structures 204 is completed on both sides respectively; the blank after printing is removed from the positioner, and the blank structure of the body 2 is obtained by removing the base by wire cutting.

[0081] The printing process of the hydraulic lifting clamp left valve 3 and the right valve 4 is as shown in the figure. Figure 4 The carbon steel base is placed on the biaxial positioner, the printing of the upper structure 301 of the left valve and the upper structure 401 of the right valve is completed upward from the surface of the base along the vertical direction; after the base is removed, the three-dimensional topography of the upper structure 301 of the left valve and the upper structure 401 of the right valve is measured to obtain the error of the forming size and the three-dimensional model, the bottom is finely processed to completely remove the machining allowance of the bottom surface; the upper structure 301 of the left valve and the upper structure 401 of the right valve are turned over by 180 degrees and fixed on the biaxial positioner, manual electric welding can be used to increase support or increase inclined pads to fix, the surface is finely processed as the printing base to prepare for printing; the printing of the lower structure 302 of the left valve and the lower structure 402 of the right valve is completed; the blank structure of the left valve 3 and the right valve 4 is removed from the biaxial positioner.

[0082] The machining allowance between the printing blank and the base is 6-15 mm, and the machining allowance of the remaining surface of the formed part is 3-6 mm. In the additive manufacturing printing process, the base is preheated by resistance heating or flame preheating to increase the temperature of the base / formed part, and the problem of the formed part is reduced by air cooling or natural cooling, the temperature control range between layers is 100-200℃. Before printing, the oxidation film on the base / the surface of the last part printed needs to be removed when the positioner is turned over or rotated for new structure printing, laser cleaning or angle grinder polishing can be used for cleaning.

[0083] The printing is completed by using an electric arc additive manufacturing process (CMT welding, plasma welding, argon arc welding), the diameter of the welding wire used is 0.8-1.2 mm, the single-layer printing height is 1.5-2 mm, the overlap rate is 40%-60%, the welding gun moving speed is 6-10 mm / s, and the wire feeding speed is 5-8 m / min.

[0084] (4) Post-processing of the hydraulic lifting clamp

[0085] The blank of the hydraulic lifting clamp parts is placed in a heat treatment furnace for stress relief annealing treatment, the treatment temperature is 500-650 DEG C, and the time is 2-4 hours. The size of the additive manufacturing hydraulic lifting clamp is measured, and a mechanical machining scheme is designed to precisely machine the size.

[0086] (5) Product inspection and physical verification

[0087] According to the design technical requirements of the hydraulic lifting clamp, the additive manufacturing part of the additive manufacturing hydraulic lifting clamp is subjected to non-destructive testing and size inspection. The internal and surface quality are respectively subjected to non-destructive testing by using ultrasonic, magnetic powder and other methods; for the defects exceeding the standard, after evaluation, if the repair standard is met, the internal defects are removed by mechanical machining, the additive manufacturing is repaired at the damaged part by using the same additive manufacturing process and equipment, and the non-destructive testing is repeated until the standard requirements are met. After the hydraulic lifting clamp is assembled, it is placed on a test platform to complete the full-size test verification under 1.5 times of the design load, and the load-carrying capacity of the additive manufacturing hydraulic lifting clamp is verified to meet the use requirements.

[0088] Taking the hydraulic lifting clamp with a load of 100 t as an example, the tensile strength of the traditional cast hydraulic lifting clamp is 600-700 MPa, the yield strength is 300-400 MPa, and the impact energy KV2 at-20 DEG C is 15-30 J. After optimization of the material and the additive manufacturing process, the tensile strength of the additive manufacturing hydraulic lifting clamp reaches 700-800 MPa, the yield strength is 550-650 MPa, and the impact energy KV2 at-20 DEG C is 130-180 J. Therefore, the toughness of the material of the hydraulic lifting clamp can be significantly improved by using the additive manufacturing method, and the service safety of the equipment is improved.

[0089] The above content only illustrates the technical idea of the present application, and cannot limit the protection scope of the present application. Any modification made according to the technical idea of the present application on the basis of the technical scheme falls within the protection scope of the claims of the present application.

Claims

1. An electric arc additive manufacturing method of a hydraulic elevator hook, characterized by, Comprise the following steps: S1: respectively establish the three-dimensional structure data model of each part of the traditional hydraulic lifting clamp, carry out additive manufacturing process analysis and structure local optimization, and determine the welding wire and printing process parameters meeting the requirements; S2: according to the optimized three-dimensional structure data model, the additive manufacturing of hydraulic lifting clamp is carried out, specifically: the optimized three-dimensional structure data model is imported into the additive manufacturing slicing software for blocking and zoning, and the control program for additive manufacturing process control is generated after layer-by-layer slicing, and the printing is started, specifically including: S201: place the carbon steel base on the biaxial positioner, print the suspension pipe column structure (201) in the hydraulic lifting clamp body (2) from the surface of the base upward along the vertical direction; S202: turn the positioner by 90 degrees, and start printing the left and right valve mounting structure (202) with the side of the suspension pipe column structure (201) as the printing bottom surface, and the printing direction is the vertical direction; S203: the positioner is rotated by 180 degrees without changing the turning angle, and the printing of the structure (203) for fixing the hydraulic device on the main body is completed; S204: the positioner is turned by ± 90 degrees without changing the turning angle, and the printing of the lifting ring suspension structure (204) is completed on both sides; S205: remove the printing completed blank from the positioner, and obtain the blank structure of the hydraulic lifting clamp body (2) by removing the base with wire cutting; S3: carry out nondestructive testing and size inspection on the additive manufactured hydraulic lifting clamp.

2. The method of electric arc additive manufacturing of a hydraulic elevator lifting clamp according to claim 1, characterized in that, The three-dimensional structure data model of each part of the traditional hydraulic lifting clamp is analyzed and locally optimized, specifically: the boss structure at the connection part of the left and right valves and the main body is directly taken out during process design, and the original function is restored by manual repair welding or adding shims; the structure of the traditional hydraulic lifting clamp is modified according to the forming strategy of the additive manufactured hydraulic lifting clamp to obtain a three-dimensional structure data model suitable for additive manufacturing.

3. The method of claim 1, wherein the hydraulic spreader is a hydraulic spreader for a nuclear reactor. The determination of the welding wire and printing process parameters meeting the requirements is: Selecting the additive manufacturing hydraulic lifting clamp material and process trial block on the carbon steel base, testing its metallography, hardness and mechanical properties according to the design technical requirements of the hydraulic lifting clamp, verifying the selection of the additive manufacturing hydraulic lifting clamp material and printing process; According to the printing scheme of the hydraulic lifting clamp, the parts with different overhanging angles are locally printed, and the printing parameters of the overhanging structure and whether to add support are determined according to the forming quality, and the design of the overall printing strategy is completed.

4. The method of claim 1, wherein the hydraulic spreader is a hydraulic spreader for a nuclear reactor. The printing process of the left valve (3) and the right valve (4) of the hydraulic lifting clamp comprises the following steps: S206: place the carbon steel base on the biaxial positioner, print the left valve upper structure (301) and the right valve upper structure (401) from the surface of the base upward along the vertical direction; S207: remove the base and measure the three-dimensional topography of the left valve upper structure (301) and the right valve upper structure (401), obtain the error between the forming size and the three-dimensional model, and finish machining the bottom to completely remove the machining allowance of the bottom surface; S208: Turn over (180) degrees of the left valve upper structure (301) and the right valve upper structure (401) and fix on the double-axis displacement machine, which can be fixed by manual electric welding to increase support or increase inclined pad, to finish the surface as a printing base to prepare for printing; S209: Complete the printing of the left valve lower structure (302) and the right valve lower structure (402); remove the blank structure of the left valve (3) and the right valve (4) from the double-axis displacement machine.

5. The method of claim 1 or 4, wherein the method is an electric arc additive manufacturing method of a hydraulic elevator lifting hook, characterized in that, The processing allowance between the printed blank structure and the base body is 6-15mm, and the processing allowance of the remaining surface of the formed part is 3-6mm.

6. The method of claim 1, wherein the hydraulic spreader is an arc-based additive manufacturing method. The printing is completed by using the electric arc additive manufacturing process, the diameter of the welding wire used is 0.8-1.2mm, the single-layer printing height is 1.5-2mm, the overlap rate is 40%-60%, the welding gun moving speed is 6-10mm / s, and the wire feeding speed is 5-8m / min.

7. The method of claim 1, wherein the hydraulic spreader is an arc-based additive manufacturing method. After the additive manufacturing of the hydraulic lifting clamp, the post-processing of the hydraulic lifting clamp is further included, specifically: Put the blank structure of each part of the hydraulic lifting clamp into the heat treatment furnace for stress relief annealing treatment, the treatment temperature is 500-650℃, and the time is 2-4 hours; measure the size of each part of the additive manufactured hydraulic lifting clamp, and design a mechanical machining scheme for accurate size machining.

8. The method of claim 1, wherein the hydraulic spreader is an arc-based additive manufacturing method. The non-destructive testing and size inspection of the additive manufactured hydraulic lifting clamp specifically include: Use ultrasonic, magnetic powder and other methods to perform non-destructive testing on the internal and surface quality respectively; for the defects exceeding the standard, if the repair standard is met, remove the internal defects by mechanical machining, repair the damaged parts by additive manufacturing using the same additive manufacturing process and equipment, and repeat the non-destructive testing until the standard requirements are met; After assembling the hydraulic lifting clamp, place it on the test platform to complete the full-size test verification under 1.5 times the design load, and verify that the load carrying capacity of the additive manufactured hydraulic lifting clamp meets the use requirements.

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