Electric arc additive manufacturing method of hydraulic elevator

Abstract

The invention discloses an electric arc additive manufacturing method of a hydraulic elevator, and belongs to the technical field of electric arc additive manufacturing of large metal components, the electric arc additive manufacturing technology is adopted to replace a traditional casting method to manufacture the hydraulic elevator, the design and manufacturing concepts of traditional products are changed, a mold is not needed, and the production requirement can be quickly responded. The bearing capacity of parts can be adjusted by flexibly changing materials according to product requirements, the performance of the hydraulic elevator is greatly improved, and the hydraulic elevator with excellent comprehensive performance is obtained; meanwhile, surface or near-surface defects can be repaired by adopting similar methods after nondestructive testing after additive manufacturing and printing, so that the qualification rate of products is greatly improved, the production efficiency is remarkably improved, and the production cost is reduced; compared with a traditional casting method, quenching and tempering heat treatment is not needed, and the heat treatment process difficulty and the cost difficulty are remarkably reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of arc additive manufacturing of large metal components, and particularly relates to an arc additive manufacturing method for a hydraulic elevator clamp. Background Art

[0002] The hydraulic elevator clamp is one of the oil and gas lifting equipment. It is connected to the upper lifting ring and the lower pipe string, and is an automated wellhead equipment used for suspending the pipe string during drilling and workover operations. The equipment mainly consists of a main body, left and right valves, a locking tongue body, a valve, and a locking tongue shaft, and executes instructions through a liquid-electric control system to orderly complete automatic rotation, opening and closing, locking, and floating functional actions.

[0003] Currently, the main load-bearing parts of the hydraulic elevator clamp, such as the main body, left valve, and right valve, are precision cast from high-strength alloy steel materials. Due to the relatively complex structures of the main body, left valve, and right valve of the hydraulic elevator clamp, defects such as cold shuts, shrinkage porosity, and gas holes are likely to occur in the thin-walled areas of the castings due to factors such as improper opening positions of exhaust holes and runners, slow pouring speed, and low working temperature during the traditional casting process. Some defects still have problems such as surface cracks after repair welding, resulting in a relatively high scrap rate of the rough castings of the hydraulic elevator clamp. At the same time, with the development of ultra-deep well technology, there is a demand for high load-bearing and low weight for the hydraulic elevator clamp. Traditional cast steel materials are difficult to meet the requirements due to the difficulty in improving their strength. Therefore, the traditional precision-cast alloy steel materials and casting processes are difficult to meet the production requirements of large-load elevator clamps. Summary of the Invention

[0004] In order to overcome the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide an arc additive manufacturing method for a hydraulic elevator clamp to solve the technical problem that the traditional precision-cast alloy steel materials and casting processes in the prior art are difficult to meet the production requirements of large-load elevator clamps.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

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

[0007] Respectively establish three-dimensional structure data models of the various components of the traditional hydraulic elevator clamp, conduct additive manufacturing process analysis and local structure optimization on them, and determine the wire and printing process parameters that meet the requirements;

[0008] Perform additive manufacturing of the hydraulic elevator clamp according to the optimized three-dimensional structure data model;

[0009] Conduct non-destructive testing and dimensional inspection on the additively manufactured hydraulic elevator clamp.

[0010] Preferably, the three-dimensional structural data model of each component of the traditional hydraulic elevating work tongs is analyzed for additive manufacturing process and the structure is locally optimized as follows: the boss structure at the connection part between the left and right valves and the main body is directly removed during the process design, and the original function is restored by manual repair welding or adding gaskets; the structure of the traditional hydraulic elevating work tongs is modified according to the forming strategy of the additive manufacturing hydraulic elevating work tongs to obtain a three-dimensional structural data model suitable for additive manufacturing.

[0011] Preferably, after determining the wire and printing process parameters that meet the requirements:

[0012] Small test blocks are trial-produced on a carbon steel substrate using the above materials and processes, and metallographic, hardness, and mechanical property tests are carried out on them according to the design technical requirements of the hydraulic elevating work tongs to verify the selection of materials and printing processes for the additive manufacturing hydraulic elevating work tongs.

[0013] According to the printing scheme of the hydraulic elevating work tongs, parts with different overhang angles are selected for local trial printing, and the printing parameters of the overhanging structure and whether to add supports are judged according to the forming quality to complete the design of the overall printing strategy.

[0014] Preferably, the additive manufacturing of the hydraulic elevating work tongs is specifically as follows: the optimized three-dimensional structural data model is imported into the additive manufacturing slicing software for block division and zoning, and after layer-by-layer slicing, a control program for controlling the additive manufacturing process is generated to start printing.

[0015] Preferably, the printing process of the main body of the hydraulic elevating work tongs includes the following steps:

[0016] S201: Place the carbon steel substrate on a two-axis positioner and print the suspension pipe column structure in the main body of the hydraulic elevating work tongs upward from the surface of the substrate in the vertical direction;

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

[0018] S203: Keep the flipping angle of the positioner unchanged, rotate the positioner 180 degrees, and complete the printing of the structure for fixing the hydraulic device on the main body with the arc surface as the reference surface;

[0019] S204: Keep the flipping angle of the positioner unchanged, rotate the positioner ±90 degrees, and complete the printing of the sling suspension structure 204 on both sides respectively;

[0020] S205: Remove the printed blank from the positioner, and use wire cutting to remove the substrate to obtain the blank structure of the main body 2.

[0021] Preferably, the printing process of the left and right valves of the hydraulic elevating work tongs includes the following steps:

[0022] S206: Place the carbon steel substrate on the biaxial positioner and print the upper structures of the left and right valves upward from the substrate surface in the vertical direction to complete the printing.

[0023] S207: After removing the substrate, perform three-dimensional topography measurement on the upper structures of the left and right valves to obtain the error between the formed dimensions and the three-dimensional model, and perform finish machining on the bottom to completely remove the machining allowance on the bottom surface.

[0024] S208: Flip the upper structures of the left and right valves by a certain degree and fix them on the biaxial positioner. It can be fixed by using manual electric welding to increase support or adding inclined pads. Use the finish-machined surface as the printing base to prepare for printing.

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

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

[0027] Preferably, the printing is completed by the 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 moving speed of the welding torch 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, post-processing of the hydraulic lifting clamp is also included. Specifically:

[0029] Put the blank structures of the various components of the hydraulic lifting clamp into the heat treatment furnace for stress relief annealing treatment. The treatment temperature is 500 - 650 °C, and the time is 2 - 4 hours; measure the dimensions of the various components of the additively manufactured hydraulic lifting clamp, and design a machining plan to perform precise dimensional machining on it.

[0030] Preferably, non-destructive testing and dimensional inspection are performed on the additively manufactured hydraulic lifting clamp. Specifically, it includes:

[0031] Use methods such as ultrasonic and magnetic particle to perform non-destructive testing on its internal and surface quality respectively; after evaluating the excessive defects, if they meet the repair standard, use machining to remove the internal defects, and use the same additive manufacturing process and equipment to perform additive repair on the defective parts, and repeat the non-destructive testing until the standard requirements are met;

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

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

[0034] An arc additive manufacturing method for a hydraulic elevator clamp disclosed by the present invention uses arc additive manufacturing technology to replace the traditional casting method for manufacturing hydraulic elevator clamps, changing the design and manufacturing concepts of traditional products. Without the need for molds, it can quickly respond to production requirements; it can flexibly change materials according to product requirements to adjust the load-bearing capacity of parts, greatly improving the performance of hydraulic elevator clamps and obtaining hydraulic elevator clamps with excellent comprehensive performance; at the same time, after non-destructive testing after additive manufacturing printing, the surface or near-surface defects can be repaired by the same method, thereby greatly improving the qualified rate of products, significantly improving production efficiency, and reducing production costs; compared with the traditional casting method, the present invention does not require quenching and tempering heat treatment, significantly reducing the difficulty of heat treatment process and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is the additive manufacturing flow chart of the hydraulic elevator clamp of the present invention;

[0036] Figure 2 is the additive manufacturing flow chart of the hydraulic elevator clamp of the embodiment of the present invention;

[0037] Figure 3 is the structural schematic diagram of the printing process of the main body of the hydraulic elevator clamp in the present invention;

[0038] Figure 4 is the structural schematic diagram of the printing process of the left / right valve of the hydraulic elevator clamp in the present invention.

[0039] Wherein: 1 - matrix; 2 - main body of the elevator clamp; 201 - suspension pipe structure; 202 - left and right valve installation structure; 203 - fixed hydraulic device structure; 204 - sling suspension structure; 3 - left valve; 301 - upper structure of the left valve; 302 - lower structure of the left valve; 4 - right valve; 401 - upper structure of the right valve; 402 - lower structure of the right valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0041] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

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

[0043] See Figure 1 , the present invention discloses an arc additive manufacturing method for a hydraulic elevator clamp, including the following steps:

[0044] S1: Respectively establish three-dimensional structure data models of each component of the traditional hydraulic elevator clamp, conduct additive manufacturing process analysis and local structure optimization on it, and determine qualified welding wires and printing process parameters;

[0045] In some embodiments, the additive manufacturing process analysis and local structure optimization of the three-dimensional structure data models of each component of the traditional hydraulic elevator clamp are specifically as follows: the boss structure at the connection part between the left and right valves and the main body is directly removed during the process design, and the original function is restored by manual repair welding or adding gaskets; the structure of the traditional hydraulic elevator clamp is modified according to the forming strategy of the additive manufacturing hydraulic elevator clamp to obtain a three-dimensional structure data model suitable for additive manufacturing.

[0046] In some embodiments, after determining the qualified welding wires and printing process parameters:

[0047] On the carbon steel substrate, trial-produced small test blocks are selected with the above materials and processes, and their metallography, hardness and mechanical properties are tested according to the design technical requirements of the hydraulic elevator clamp to verify the selection of materials and printing processes for the additive manufacturing hydraulic elevator clamp;

[0048] According to the printing scheme of the hydraulic elevator clamp, parts with different overhanging angles are selected for local trial printing, and the printing parameters of the overhanging structure and whether to add supports are judged according to the forming quality to complete the design of the overall printing strategy.

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

[0050] In some embodiments, the additive manufacturing of the hydraulic elevators is specifically as follows: the optimized three-dimensional structure data model is imported into the additive manufacturing slicing software for block division and zoning. After layer-by-layer slicing, a control program for the additive manufacturing process is generated to start printing.

[0051] Further preferably, the printing process of the hydraulic elevator body 2 includes the following steps:

[0052] S201: Place the carbon steel substrate on the biaxial positioner and print the suspension pipe column structure 201 in the hydraulic elevator body 2 upward from the substrate surface in the vertical direction;

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

[0054] S203: Keep the flipping angle of the positioner unchanged, rotate the positioner 180 degrees, and complete the printing of the structure 203 for fixing the hydraulic device on the main body with the arc surface as the reference surface;

[0055] S204: Keep the flipping angle of the positioner unchanged, rotate the positioner ±90 degrees, and complete the printing of the sling suspension structures 204 on both sides respectively;

[0056] S205: Remove the printed blank from the positioner, and use wire cutting to remove the substrate to obtain the blank structure of the main body 2.

[0057] In some embodiments, the machining allowance between the printed blank structure and the substrate is 6 - 15 mm, and the machining allowance for the remaining surfaces 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 elevator includes the following steps:

[0059] S206: Place the carbon steel substrate on the biaxial positioner and print the upper structures 301 of the left valve and 401 of the right valve upward from the substrate surface in the vertical direction;

[0060] S207: After removing the substrate, perform three-dimensional topography measurement on the upper structures 301 of the left valve and 401 of the right valve to obtain the error between the formed dimensions and the three-dimensional model, and perform finish machining on the bottom to completely remove the machining allowance on the bottom surface;

[0061] S208: Flip the upper structures 301 of the left valve and 401 of the right valve 180 degrees and fix them on the biaxial positioner. It can be fixed by means of manual electric welding to increase support or adding inclined pads, and prepare for printing with the finish-machined surface as the printing base;

[0062] S209: Complete the printing of the lower structure 302 of the left valve and the lower structure 402 of the right valve; Remove the blank structures of the left valve 3 and the right valve 4 from the dual-axis positioner.

[0063] In some embodiments, the machining allowance between the printed blank structure and the substrate is 6 - 15 mm, and the machining allowance for the remaining surfaces of the formed part is 3 - 6 mm.

[0064] In some embodiments, the printing is completed using the 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 overlapping rate is 40% - 60%, the moving speed of the welding torch 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, post-processing of the hydraulic lifting clamp is further included, specifically:

[0066] Put the blank structures of the various components of the hydraulic lifting clamp into a heat treatment furnace for stress relief annealing treatment. The treatment temperature is 500 - 650 °C, and the time is 2 - 4 hours; Measure the dimensions of the various components of the additively manufactured hydraulic lifting clamp, and design a machining plan to perform precise dimensional machining on it.

[0067] S3: Perform non-destructive testing and dimensional inspection on the additively manufactured hydraulic lifting clamp.

[0068] In some embodiments, the non-destructive testing and dimensional inspection of the additively manufactured hydraulic lifting clamp specifically include:

[0069] Use methods such as ultrasonic and magnetic particle to perform non-destructive testing on its internal and surface quality respectively; After evaluating the excessive defects, if they meet the repair standard, use machining to remove the internal defects, and use the same additive process and equipment to perform additive repair on the defective parts, and repeat the non-destructive testing until the standard requirements are met;

[0070] After assembling the hydraulic lifting clamp, place it on the test platform to complete the full-scale test verification with a 1.5-fold design load, and verify that the bearing capacity of the additively manufactured hydraulic lifting clamp meets the use requirements.

[0071] The present application adopts arc additive manufacturing technology to replace the traditional casting method to manufacture hydraulic elevators, which changes the design and manufacturing concept of traditional products. It does not require molds and can quickly respond to production needs. It can flexibly change materials to adjust the bearing capacity of parts according to product needs, greatly improve the performance of hydraulic elevators, and obtain hydraulic elevators with excellent comprehensive performance. At the same time, after additive manufacturing printing and non-destructive testing, similar methods can be used to repair surface or near-surface defects, thereby greatly improving the product qualification rate, significantly improving production efficiency, and reducing production costs. Compared with traditional casting methods, the present invention does not require tempering heat treatment, which significantly reduces the difficulty and cost difficulty of heat treatment process.

[0072] [Example]

[0073] See also Figure 2 The present invention provides an arc additive manufacturing method for a hydraulic elevator, comprising the following steps:

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

[0075] The three-dimensional models of the components of the traditional hydraulic elevator were established respectively, and the additive manufacturing process was analyzed. Since the structures of the hydraulic elevator and the left and right valves are relatively complex, in order to reduce the problem of difficulty in printing the suspended parts during the printing process, it is necessary to control the printing direction by means of partition printing and robot + dual-axis positioner linkage control, so that the printing direction is guaranteed to be vertically upward; the partition printing is based on the principle of minimum suspended structure and minimum suspended angle; some fine structures (boss structures) at the connection between the left and right valves and the main body are difficult to form directly due to the suspension. During the printing process design, the boss structure is directly removed, and the original function is restored by manual welding or adding gaskets. According to the forming strategy of the additive manufacturing hydraulic elevator, the structure of the traditional hydraulic elevator is modified to obtain a three-dimensional structural data model suitable for additive manufacturing.

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

[0077] According to the design and technical requirements of the hydraulic elevator, the welding wire and printing process parameters that meet the requirements are preliminarily selected; the above-mentioned materials and processes are used to trial-produce small test blocks on a carbon steel substrate, and the metallographic, hardness and mechanical properties are tested according to the design and technical requirements of the hydraulic elevator to verify the selection of materials and printing processes for additive manufacturing hydraulic elevators; according to the printing plan of the hydraulic elevator, parts with different suspension angles are selected for local trial printing, and the printing parameters of the suspended structure and whether to increase support are determined based on the forming quality to complete the design of the overall printing strategy.

[0078] (3) Additive Manufacturing of Hydraulic Elevators

[0079] Import the 3D structural data model of additive manufacturing into the additive manufacturing slicing software for block division and zoning. Input the optimized additive manufacturing process selected above into the slicing software. After layer-by-layer slicing, generate a control program for controlling the additive manufacturing process and prepare to start printing.

[0080] Printing process of the hydraulic elevator clamp body 2: As Figure 3 shown, place the carbon steel matrix on the biaxial positioner and print the suspension pipe column structure 201 in the hydraulic elevator clamp body 2 upward from the surface of the matrix along the vertical direction; flip the positioner 90 degrees, and start printing the left and right valve mounting structures 202 with the side surface of the suspension pipe column structure 201 as the printing bottom surface, and the printing direction is the vertical direction; keep the flipping angle of the positioner unchanged, rotate the positioner 180 degrees, and complete the printing of the structure 203 for fixing the hydraulic device on the main body with the arc surface as the reference surface; keep the flipping angle of the positioner unchanged, rotate the positioner ±90 degrees, and complete the printing of the sling suspension structures 204 on both sides respectively; remove the printed blank from the positioner, and use wire cutting to remove the matrix to obtain the blank structure of the main body 2.

[0081] Printing process of the left valve 3 and right valve 4 of the hydraulic elevator clamp: As Figure 4 shown, place the carbon steel matrix on the biaxial positioner and print the upper structures 301 of the left valve and 401 of the right valve upward from the surface of the matrix along the vertical direction; after removing the matrix, perform three-dimensional topography measurement on the upper structures 301 of the left valve and 401 of the right valve to obtain the error between the formed size and the three-dimensional model, and perform finish machining on the bottom to completely remove the machining allowance on the bottom surface; flip the upper structures 301 of the left valve and 401 of the right valve 180 degrees and fix them on the biaxial positioner. It can be fixed by manually welding to increase support or adding inclined pads, and use the finish-machined surface as the printing base to prepare for printing; complete the printing of the lower structures 302 of the left valve and 402 of the right valve; remove the blank structures of the left valve 3 and right valve 4 from the biaxial positioner.

[0082] The machining allowance between the printed blank and the matrix is 6 - 15 mm, and the machining allowance for the remaining surfaces of the formed part is 3 - 6 mm. During the additive manufacturing printing process, the matrix preheating is carried out by resistance heating or flame preheating to increase the temperature of the matrix / formed part, and the temperature of the formed part is reduced by air cooling or natural cooling. The interlayer temperature control range is 100 - 200 °C. Before printing, when flipping or rotating the positioner for printing a new structure each time, it is necessary to remove the oxide film on the matrix / the printing surface of the previous part, and laser cleaning or angle grinder polishing can be used for cleaning.

[0083] Printing is completed using the arc additive manufacturing process (CMT welding, plasma welding, TIG 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 torch movement speed is 6 - 10 mm / s, and the wire feeding speed is 5 - 8 m / min.

[0084] (4) Post-treatment of the hydraulic elevator

[0085] Put the blanks of the hydraulic elevator components into a heat treatment furnace for stress relief annealing treatment. The treatment temperature is 500 - 650 °C, and the time is 2 - 4 hours. Measure the dimensions of the additively manufactured hydraulic elevator and design a machining plan for precise dimensional machining.

[0086] (5) Product inspection and physical verification

[0087] Conduct non-destructive testing and dimensional inspection on the additively manufactured part of the additively manufactured hydraulic elevator according to the design technical requirements of the hydraulic elevator. Use ultrasonic, magnetic particle and other methods to conduct non-destructive testing on its internal and surface quality respectively; after evaluating the excessive defects, if they meet the repair standard, use machining to remove the internal defects, and use the same additive manufacturing process and equipment to repair the defective parts by additive manufacturing, and repeat the non-destructive testing until the standard requirements are met. After assembling the hydraulic elevator, place it on the test platform to complete the full-scale test verification with a design load of 1.5 times to verify that the load-bearing capacity of the additively manufactured hydraulic elevator meets the use requirements.

[0088] Taking the hydraulic elevator with a load-bearing capacity of 100 t as an example, the tensile strength of the traditional cast hydraulic elevator is 600 - 700 MPa, the yield strength is 300 - 400 MPa, and the impact energy KV at -20 °C 2 is 15 - 30 J. After optimizing the materials and additive manufacturing process, the tensile strength of the additively manufactured hydraulic elevator reaches 700 - 800 MPa, the yield strength is 550 - 650 MPa, and the impact energy KV at -20 °C 2 is 130 - 180 J. Therefore, the additive manufacturing method can significantly improve the strength and toughness of the materials of the hydraulic elevator and improve the service safety of the equipment.

[0089] The above content is only to illustrate the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. An arc additive manufacturing method for a hydraulic elevator Characterized in that It includes the following steps: Respectively establish three-dimensional structure data models of each component of the traditional hydraulic elevator, conduct additive manufacturing process analysis and local structure optimization on it, and determine qualified welding wires and printing process parameters; Carry out additive manufacturing of the hydraulic elevator according to the optimized three-dimensional structure data model; Conduct non-destructive testing and dimensional inspection on the additively manufactured hydraulic elevator.

2. The arc additive manufacturing method for a hydraulic elevator according to claim 1 Characterized in that The additive manufacturing process analysis and local structure optimization of the three-dimensional structure data model of each component of the traditional hydraulic elevator are specifically as follows: The boss structure at the connection part between the left and right valves and the main body is directly removed during the process design, and the original function is restored by manual repair welding or adding gaskets; Modify the structure of the traditional hydraulic elevator according to the forming strategy of the additively manufactured hydraulic elevator to obtain a three-dimensional structure data model suitable for additive manufacturing.

3. The arc additive manufacturing method for a hydraulic elevator according to claim 1 Characterized in that After determining the qualified welding wire and printing process parameters: Select the above materials and processes to trial-produce small test blocks on a carbon steel substrate, and conduct tests on metallography, hardness, and mechanical properties according to the design technical requirements of the hydraulic elevator to verify the selection of materials and printing processes for the additively manufactured hydraulic elevator; Select parts with different suspension angles according to the printing scheme of the hydraulic elevator for local trial printing, and judge the printing parameters of the suspended structure and whether to add supports according to the forming quality to complete the design of the overall printing strategy.

4. The arc additive manufacturing method for a hydraulic elevator according to claim 1 Characterized in that The additive manufacturing of the hydraulic elevator is specifically as follows: Import the optimized three-dimensional structure data model into the additive manufacturing slicing software for block division and zoning, generate a control program for controlling the additive manufacturing process after layer-by-layer slicing, and start printing.

5. The arc additive manufacturing method for a hydraulic elevator according to claim 4 Characterized in that The printing process of the main body (2) of the hydraulic elevator includes the following steps: S201: Place the carbon steel substrate on a two-axis positioner and print the suspension pipe column structure (201) in the main body (2) of the hydraulic elevator upward from the surface of the substrate along the vertical direction; S202: Flip the positioner 90 degrees, and start printing the left and right valve installation structures (202) with the side of the suspension pipe structure (201) as the printing bottom surface, and the printing direction is the vertical direction; S203: Keep the flipping angle of the positioner unchanged, rotate the positioner 180 degrees, and complete the printing of the structure (203) for fixing the hydraulic device on the main body with the arc surface as the reference surface; S204: Keep the flipping angle of the positioner unchanged, rotate the positioner ±90 degrees, and complete the printing of the sling suspension structures 204 on both sides respectively; S205: Remove the printed blank from the positioner, and use wire cutting to remove the substrate to obtain the blank structure of the main body 2.

6. The arc additive manufacturing method for a hydraulic elevator according to claim 4 Characterized in that The printing process of the left valve (3) and the right valve (4) of the hydraulic elevator clamp includes the following steps: S206: Place the carbon steel substrate on the biaxial positioner and print the upper structures (301) of the left valve and (401) of the right valve upward from the substrate surface in the vertical direction; S207: After removing the substrate, perform three-dimensional topography measurement on the upper structures (301) of the left valve and (401) of the right valve to obtain the error between the formed size and the three-dimensional model, and perform finish machining on the bottom to completely remove the machining allowance on the bottom surface; S208: After flipping the upper structures (301) of the left valve and (401) of the right valve by 180 degrees, fix them on the biaxial positioner. It can be fixed by manually welding to increase support or adding inclined pads, and use the finish-machined surface as the printing base to prepare for printing; S209: Complete the printing of the lower structures (302) of the left valve and (402) of the right valve; Remove the blank structures of the left valve (3) and the right valve (4) from the biaxial positioner.

7. An arc additive manufacturing method for a hydraulic elevator clamp according to any one of claims 5 or 6, characterized in that, The machining allowance between the printed blank structure and the substrate is 6 - 15 mm, and the machining allowance for the remaining surfaces of the formed part is 3 - 6 mm.

8. An arc additive manufacturing method for a hydraulic elevator clamp according to any one of claim 1, characterized in that, The printing is completed by an 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 moving speed of the welding torch is 6 - 10 mm / s, and the wire feeding speed is 5 - 8 m / min.

9. An arc additive manufacturing method for a hydraulic elevator clamp according to any one of claim 1, characterized in that, After the additive manufacturing of the hydraulic elevator clamp, it further includes post-treatment of the hydraulic elevator clamp, specifically: Put the blank structures of the various components of the hydraulic elevator clamp into a heat treatment furnace for stress relief annealing treatment. The treatment temperature is 500 - 650 °C and the time is 2 - 4 hours; Measure the dimensions of the various components of the additively manufactured hydraulic elevator clamp, and design a machining plan for precise dimension machining.

10. An arc additive manufacturing method for a hydraulic elevator clamp according to any one of claim 1, characterized in that, The non-destructive testing and dimensional inspection of the additively manufactured hydraulic elevator clamp specifically include: Use methods such as ultrasonic and magnetic particle to perform non-destructive testing on its internal and surface quality respectively; After evaluating the excessive defects, if they meet the repair standard, use machining to remove the internal defects, and use the same additive process and equipment to perform additive repair on the defective parts, and repeat the non-destructive testing until the standard requirements are met; After assembling the hydraulic elevator clamp, place it on the test platform to complete the full-scale test verification with 1.5 times the design load, and verify that the bearing capacity of the additively manufactured hydraulic elevator clamp meets the use requirements.

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