A processing method and equipment for rigid casing centralizer

Abstract

A processing method and equipment for rigid casing centralizers, relating to the technical field of combined processing of metal casing parts, the method comprising the following steps: cutting a metal tube with a size equivalent to the length of N rigid casing centralizers as a blank tube, prefabricating a strip-shaped metal part containing N straightening ridges as a welding part; positioning the welding part along the length direction of the blank tube and welding it to the outer surface of the blank tube to obtain an assembly; firstly, using a local cladding forming process to accumulate material on the part to be clad and formed on the surface of the assembly to form a wear-resistant and corrosion-resistant structure, and then using a coating cladding process to entirely clad a layer of wear-resistant and corrosion-resistant coating on the surface of the assembly to obtain a cladding part; after hanging and heat-treating the cladding part, cutting along the connecting part between adjacent straightening ridges to obtain N rigid casing centralizers. The present invention improves production efficiency by adopting the "welding-cladding-heat treatment-cutting" metal combined processing technology to replace the traditional metal forming process to prepare rigid casing centralizers.

Description

Technical Field

[0001] The present invention relates to the technical field of combined processing of metal casing parts, and in particular to a processing method and equipment for a rigid casing centralizer, in which the rigid casing centralizer is prepared by adopting a "welding-cladding-heat treatment-cutting" metal combined processing technology instead of a traditional metal forming process. Background Art

[0002] Casing centralizers are essential cementing tools for ensuring casing centering and play a crucial role in improving cementing quality. Rigid centralizers are a commonly used type of casing centralizer. Depending on how the centralizing ridges are formed, rigid casing centralizers are processed using either integral or welded methods. Integral forging typically achieves a dense metal structure and high mechanical properties, but requires complex molds and consumes significant energy during high-temperature heating. For example, this process can be found in patent application number CN202210836563.9, entitled "A Method for Processing an Integral Rigid Cyclone Casing Centralizer."

[0003] The welding process involves welding the ribs one by one to the pre-cut centralizer body. Although complex forming molds are not required, single-piece processing has problems such as cumbersome welding positioning operations and low production efficiency. In addition, in order to improve the overall mechanical properties of the rigid casing centralizer, the centralizer body and the ribs generally need to be made of expensive alloy steel. Summary of the Invention

[0004] Based on the above problems, the present invention provides a processing method and equipment for a rigid casing centralizer, which adopts the "welding-cladding-heat treatment-cutting" metal combination processing technology to replace the traditional metal forming process to prepare the rigid casing centralizer, thereby improving production efficiency.

[0005] The object of the present invention is achieved through the following technical solution: a processing method for a rigid casing centralizer, comprising the following steps:

[0006] Step 1, material preparation

[0007] A metal tube having a size equivalent to the length of N rigid casing centralizers is cut as a blank tube, and a strip-shaped metal part including N centralizing ribs is prefabricated as a weldment. A connection portion is provided between adjacent centralizing ribs of the weldment, and welding grooves are manufactured on both sides of the connection portion between the bottom of the weldment and the blank tube;

[0008] Among them, N≥3;

[0009] Step 2, welding assembly

[0010] After positioning the weldment in step 1 along the length direction of the blank tube, fill the welding groove with solder, and weld the weldment to the outer surface of the blank tube. Weld more than three weldments to the outer surface of each blank tube to obtain an assembly;

[0011] Step 3, Cladding

[0012] First, a local cladding forming process is used to deposit material on the area to be clad formed on the surface of the assembly obtained in step 2 to form a wear-resistant and corrosion-resistant structure, and then a layer of wear-resistant and corrosion-resistant coating is clad on the entire surface of the assembly by a coating cladding process to obtain a clad part;

[0013] Step 4, heat treatment

[0014] The cladding part obtained in step 4 is placed in a heat treatment furnace by hanging, and heated and kept warm according to the heat treatment system. After the heat treatment is completed, the furnace is opened and the part is taken out to obtain a heat-treated part;

[0015] Step 5, cutting

[0016] The heat-treated piece obtained in step 4 is cut along the connection between adjacent straightening edges to obtain N rigid casing centralizers.

[0017] The preparation process of the welded part in the above step 1 is that the prefabrication process of the welded part is a metal plate cutting process or a casting process.

[0018] In order to facilitate the local cladding forming process and coating cladding process on the surface of the assembly in step 3 and improve the stability of the wear-resistant and corrosion-resistant structure and the wear-resistant and corrosion-resistant coating, step 2 also includes a weld grinding operation.

[0019] The position of the part to be clad in the above step 3 is as follows: the part to be clad includes the arc-shaped top of each straightening rib, which is used to improve the wear resistance and corrosion resistance of the arc-shaped top of the straightening rib and increase its service life.

[0020] In step 3, the local cladding forming process and the coating cladding process adopt wire / powder laser cladding technology.

[0021] The local cladding forming process is used to straighten the curved top of the rib, and has higher requirements on material strength and hardness. For this reason, the local cladding forming process and the coating cladding process can use alloy wires or alloy powders with different compositions.

[0022] After step 5, it also includes:

[0023] Step 6: Grind the cutting seams.

[0024] After step 6, it also includes:

[0025] Step 7: Spray anti-corrosion paint on the surface.

[0026] The heat treatment system in step 4 is annealing or annealing plus solution aging. Annealing is used to eliminate residual stress within the material, refine the grain size, and improve processing properties, preparing for solution treatment. Solution treatment is used to fully dissolve the alloying elements into the assembly, forming a saturated solid solution, preparing for aging treatment and improving the material's strength and hardness.

[0027] The present invention provides a processing device for a rigid casing centralizer, which is used to implement the processing method of the rigid casing centralizer. The processing device includes:

[0028] Rotating clamping workbench, used to clamp the blank tube and drive the blank tube to rotate;

[0029] A welding device, provided at the welding station, for simultaneously filling the welding grooves on both sides of the weldment with solder;

[0030] Cladding device, set at the cladding station, used for forming wear-resistant and corrosion-resistant structures and cladding wear-resistant and corrosion-resistant coatings;

[0031] The transmission assembly is used to translate the rotary clamping table from the welding station to the cladding station.

[0032] The beneficial effects of the present invention are:

[0033] According to the present invention, a plurality of welded parts are provided on the outer surface of each blank tube along its length direction. The welded parts include a plurality of straightening ridges connected by a connecting portion. A plurality of casing centralizer products can be obtained at one time by cutting the welded welded parts and the blank tube. Compared with the prior art method of welding the straightening ridges to the blank tube one by one during separate production, a plurality of casing centralizers can be produced at one time, which greatly reduces the number of times of clamping and disassembling the blank tube and frequently welding the straightening ridges. While improving production efficiency, it can also reduce the phenomenon of uneven welding caused by frequent manual welding of multiple straightening ridges on the blank tube.

[0034] The parts to be clad and formed in the present invention include the arc-shaped top of each straightening rib, which improves the wear resistance and corrosion resistance of the arc-shaped top of the straightening rib and increases its service life. A layer of wear-resistant and corrosion-resistant coating is clad on the surface of the assembly as a whole through the coating cladding process, so that the outer surfaces of the blank pipe and the welded parts have wear-resistant and corrosion-resistant coatings, thereby improving the overall mechanical properties and corrosion resistance of the rigid casing centralizer of the present invention.

[0035] The present invention adopts the "welding-cladding-heat treatment-cutting" metal combined processing technology to replace the traditional metal forming process to prepare the rigid casing centralizer, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In the attached figure:

[0037] Figure 1 This is the process flow chart for the rigid casing centralizer processing;

[0038] Figure 2 Schematic diagram of welded parts and blank tube structure;

[0039] Figure 3 for Figure 2 A in the middle is an enlarged structural diagram;

[0040] Figure 4 for Figure 2 Right view;

[0041] Figure 5 for Figure 4 The enlarged structural diagram at B in the middle;

[0042] Figure 6 It is a schematic diagram of the structure of the welded part;

[0043] Figure 7 for Figure 6 The enlarged structural diagram at C in the middle;

[0044] Figure 8 It is a schematic diagram of the processing equipment structure;

[0045] Figure 9 for Figure 8 Enlarged structural diagram at point D in the middle.

[0046] The components corresponding to the reference numerals in the figure are:

[0047] 1. Blank tube; 2. Welding part; 21. Straightening edge; 22. Connecting part; 23. Welding groove; 3. Wear-resistant and corrosion-resistant structure; 4. Wear-resistant and corrosion-resistant coating; 5. Rotary clamping workbench; 51. Clamping chuck; 52. Base; 6. Transmission component; 7. Welding device; 8. Cladding device. DETAILED DESCRIPTION

[0048] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be noted that these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. The present disclosure can be implemented in various forms and should not be limited by the embodiments described herein.

[0049] Example 1

[0050] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, a method for processing a rigid casing centralizer includes the following steps:

[0051] Step 1, material preparation

[0052] A metal tube having a length equivalent to the length of N rigid casing centralizers is cut as a blank tube 1. A strip-shaped metal piece including N centralizing ribs 21 is prefabricated as a weldment 2. Connecting portions 22 are formed between adjacent centralizing ribs 21 of the weldment 2. Welding grooves 23 are formed on both sides of the bottom of the weldment 2 where it connects to the blank tube 1.

[0053] Among them, N≥3.

[0054] The prefabrication process of the weldment 2 in step 1 is preferably a metal plate cutting process, but a casting process may also be used.

[0055] Step 2, welding assembly

[0056] Arrange the welding parts 2 in step 1 along the length direction of the blank tube 1, first position and preliminarily fix the welding parts 2 on the blank tube 1 by spot welding, then fill the welding groove 23 with solder, and firmly weld the welding parts 2 to the outer surface of the blank tube 1. More than three welding parts 2 are welded to the outer surface of each blank tube 1, for example, four in this embodiment, to obtain an assembly.

[0057] In order to ensure the appearance quality and facilitate the implementation of local cladding molding process and coating cladding process on the surface of the assembly in the next step 3, this step also includes weld grinding operation.

[0058] Step 3, Cladding

[0059] See also Figure 6 and Figure 7 As shown, in this step, a corrosion-resistant and corrosion-resistant material is first deposited on the to-be-clad forming portion of the surface of the assembly obtained in step 2 through a local cladding forming process (the corrosion-resistant and corrosion-resistant material can be nickel-chromium alloy powder or nickel-chromium alloy, etc.) to form a wear-resistant and corrosion-resistant structure 3, and then a layer of wear-resistant and corrosion-resistant coating 4 (the wear-resistant and corrosion-resistant coating 4 can be a metal-based coating such as a nickel-based alloy coating, a cobalt-based alloy coating, etc.) is clad on the entire surface of the assembly through a coating cladding process to obtain a cladding part.

[0060] The local cladding molding process is used for the arc-shaped top of the straightening edge 21. The molding size margin is reserved for this part in step 1. This part is formed by the local cladding molding process through additive manufacturing, which can ensure that the rigid casing centralizer resists wear during use. Figure 7 Further illustration shows that Figure 6 After cladding at point C, the wear-resistant and corrosion-resistant structure 3 is only a small arc-shaped piece on the top of the straightening edge 21, and the wear-resistant and corrosion-resistant coating 4 is a thin cladding coating covering the entire surface of the assembly. The wear-resistant and corrosion-resistant coating 4 is located on the outside of the wear-resistant and corrosion-resistant structure 3.

[0061] The alloy material of the wear-resistant and corrosion-resistant structure 3 may have higher strength and hardness than the outermost wear-resistant and corrosion-resistant coating 4 . Therefore, alloy wires or alloy powders with different compositions may be used in the local cladding forming process and the coating cladding process.

[0062] The local cladding forming process and coating cladding process in this step can adopt wire / powder laser cladding technology. If the laser cladding technology of multiple material cladding processes is used, the process or material can also be switched by replacing different laser cladding heads.

[0063] In this step, the arc-shaped top of each straightening rib 21 is formed with a wear-resistant and corrosion-resistant structure 3, which improves the mechanical properties of the arc-shaped top of the straightening rib 21 of each single rigid casing centralizer product finally obtained. At the same time, the outer surface of each single rigid casing centralizer product is covered with a wear-resistant and corrosion-resistant coating 4, which ensures the overall wear-resistant and corrosion-resistant performance and increases its service life.

[0064] Due to the adoption of the cladding technology of the present invention, cheaper common steel pipes can be selected as the blank pipe 1, thus saving manufacturing costs.

[0065] Step 4, heat treatment

[0066] The clad part obtained in step 4 is placed in a heat treatment furnace by hanging, and heated and kept warm according to the heat treatment system. After the heat treatment is completed, the furnace is opened and the part is removed to obtain a heat-treated part. Choosing a hanging method to place the clad part in the heat treatment furnace can prevent the long pipe from bending and deforming during the heat treatment.

[0067] The heat treatment system in this step can be annealing or annealing combined with solution treatment and aging. Annealing is used to eliminate residual stress within the material, refine the grain size, and improve processing properties, preparing for solution treatment. Solution treatment is used to fully dissolve the alloying elements into the assembly, forming a saturated solid solution, preparing for aging treatment and improving the material's strength and hardness.

[0068] Step 5, cutting

[0069] The heat-treated piece obtained in step 4 is cut along the connecting portion 22 between adjacent straightening edges 21 to obtain N rigid casing centralizers.

[0070] In this embodiment, the outer surface of each blank tube 1 is provided with multiple welded parts 2 along its length direction. The welded parts 2 include multiple straightening ribs 21 connected by connecting parts 22. Multiple rigid casing centralizer products are obtained at one time by cutting the welded welded parts 2 and the blank tube 1. Compared with the prior art method of welding the straightening ribs 21 to the blank tube 1 one by one when a single piece is independently produced, it is possible to produce multiple casing centralizers at one time, greatly reducing the number of times of clamping and disassembling the blank pipe and frequently welding the straightening ribs 21. While improving production efficiency, it can also reduce the phenomenon of uneven welding caused by frequently welding multiple straightening ribs 21 on the blank tube 1.

[0071] In this embodiment, after step 5, the following steps are further included:

[0072] Step 6: Grind the cutting seams.

[0073] After step 6, it also includes:

[0074] Step 7: Spray anti-corrosion paint on the surface.

[0075] Steps 6 and 7 are general processing techniques and will not be described in detail.

[0076] Example 2

[0077] This embodiment provides a processing device for a rigid casing centralizer, which is used to match the processing method for the rigid casing centralizer proposed in Example 1.

[0078] like Figure 8 As shown, the processing equipment includes a rotary clamping workbench 5, a welding device 7, a cladding device 8 and a transmission component 6.

[0079] The rotary clamping workbench 5 is used to clamp the blank tube 1 and drive the blank tube 1 to rotate.

[0080] The rotary clamping worktable 5 includes two symmetrically arranged sets of pipe clamping fixtures, each comprising a base 52 and clamping chucks 51 mounted thereon. The two clamping chucks 51 are located at either end of the raw pipe 1, respectively clamping the inner wall of the raw pipe 1. The two clamping chucks 51 can drive the raw pipe 1 to rotate, facilitating angle switching for welding multiple welded parts 2 to the outer surface of the raw pipe 1 and facilitating subsequent partial cladding and coating processes on the assembled part. The base 52 is mounted on the transport assembly 6 and can move the assembled part along the transport direction of the transport assembly 6 to different workstations.

[0081] The welding device 7 is provided at the welding station and is used to simultaneously fill the welding grooves 23 on both sides of the weldment 2 with solder. The welding device 7 is a welding robot, and at least two welding robots are provided. The welding robots are provided on both sides of the transmission assembly 6 and can weld the weldment 2 to the blank tube 1 on both sides of the weldment 2. In order to avoid the two welding robots performing welding on both sides of the same position of the weldment 2, resulting in overlapping heat-affected zones, welding deformation or welding stress concentration at the welding position, which affects the service life and performance of the assembly, the two welding robots can perform staggered welding at both ends of the weldment 2 when welding the same weldment 2. That is, the control system program is set so that when welding the same weldment 2, the welding robot on one side feeds from left to right, and the welding robot on the other side feeds from right to left.

[0082] The cladding device 8 can be a laser cladding device with a wire feeder or a powder sprayer, which is set at the cladding station for forming the wear-resistant and corrosion-resistant structure 3 and cladding the wear-resistant and corrosion-resistant coating 4. The step of forming the wear-resistant and corrosion-resistant structure 3 is placed before preparing the cladding wear-resistant and corrosion-resistant coating 4 instead of being placed in step 1 of prefabricating the weldment 2. This can make full use of the temperature rise of the parts during the forming process of the wear-resistant and corrosion-resistant structure 3 to achieve the preheating effect before the coating is clad. For example, define the weldment 2 in the vertical direction as a 0° weldment and the weldment 2 in the horizontal direction as a 90° weldment. Figure 8 The two cladding devices 8 shown in the figure use wire cladding to simultaneously form the wear-resistant and corrosion-resistant structures 3 on the 0° weldment 2 and the 90° weldment 2, but the feeding directions are opposite, one from left to right and the other from right to left. After the blank tube 1 is rotated at an angle, a reverse feeding cladding process is performed again. After the wear-resistant and corrosion-resistant structures 3 on the four weldments 2 are all completed, a suspended cladding device 8 (not shown in the figure) is used to use a powder spray cladding method to reciprocate left and right on the outer surface of the rotating blank tube 1 to form a wear-resistant and corrosion-resistant coating 4 until the required thickness is reached.

[0083] It should be noted that the number of cladding devices 8 and the cladding actions can be varied in many ways. The above are just examples. Moreover, as needed, for the same cladding device 8, the cladding process or cladding material can be switched by replacing the laser cladding head.

[0084] The transmission component 6 is a production line platform conveyor, which is used to translate and transport the rotary clamping workbench 5 from the welding station to the cladding station. Existing technology can be used and will not be described in detail.

[0085] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for processing a rigid casing centralizer, characterized in that: The following steps are involved: Step 1, material preparation A metal tube having a size equivalent to the length of N rigid casing centralizers is cut as a blank tube (1), a strip-shaped metal part including N centralizing ridges (21) is prefabricated as a welded part (2), a connecting portion (22) is provided between adjacent centralizing ridges (21) of the welded part (2), and welding grooves (23) are manufactured on both sides of the portion where the bottom of the welded part (2) is connected to the blank tube (1); Among them, N≥3; Step 2, welding assembly After positioning the welding piece (2) in step 1 along the length direction of the blank tube (1), fill the welding groove (23) with solder, and weld the welding piece (2) to the outer surface of the blank tube (1), and weld more than three welding pieces (2) to the outer surface of each blank tube (1) to obtain an assembly; The welding station is provided with a welding device (7) for simultaneously filling solder into the welding grooves on both sides of the weldment. The welding device (7) is a welding robot, and two welding robots are provided. When the two welding robots weld the same weldment, the control system program is set so that the welding robot on one side feeds in a direction from left to right, and the welding robot on the other side feeds in a direction from right to left. Step 3, Cladding First, a material is deposited on the portion of the assembly surface to be clad and formed obtained in step 2 by a local cladding process to form a wear-resistant and corrosion-resistant structure (3), and then a layer of wear-resistant and corrosion-resistant coating (4) is clad on the entire surface of the assembly surface by a coating cladding process to obtain a cladding component; The portion to be clad and formed includes the arc-shaped top of each straightening edge (21), and the portion is reserved for forming size margin in step 1; the alloy material of the wear-resistant and corrosion-resistant structure (3) has higher strength and hardness than the outermost wear-resistant and corrosion-resistant coating (4); Step 4, heat treatment The cladding part obtained in step 4 is placed in a heat treatment furnace by hanging, and heated and kept warm according to the heat treatment system. After the heat treatment is completed, the furnace is opened and the part is taken out to obtain a heat-treated part; Step 5, cutting The heat-treated piece obtained in step 4 is cut along the connecting portion (22) between adjacent straightening edges (21) to obtain N rigid casing straighteners.

2. A method for processing a rigid casing centralizer according to claim 1, characterized in that: In step 1, the prefabrication process of the weldment (2) is a metal plate cutting process or a casting process.

3. A method for processing a rigid casing centralizer according to claim 1, characterized in that: Step 2 also includes a weld grinding operation.

4. A method for processing a rigid casing centralizer according to claim 1, characterized in that: The local cladding forming process and the coating cladding process in step 3 adopt wire / powder laser cladding technology.

5. A method for processing a rigid casing centralizer according to claim 4, characterized in that: The local cladding forming process and the coating cladding process use alloy wires or alloy powders composed of different components.

6. A method for processing a rigid casing centralizer according to claim 1, characterized in that: After step 5, the method further comprises: Step 6: Grind the cutting seams.

7. A method for processing a rigid casing centralizer according to claim 6, characterized in that: After step 6, the method further comprises: Step 7: Spray anti-corrosion paint on the surface.

8. A method for processing a rigid casing centralizer according to claim 1, characterized in that: The heat treatment system in step 4 is annealing, or annealing plus solution aging.

9. A processing device for a rigid casing centralizer, used for implementing the processing method according to any one of claims 1 to 8, characterized in that: include: A rotating clamping workbench (5) for clamping the blank tube (1) and driving the blank tube (1) to rotate; A welding device (7) is provided at a welding station and is used to simultaneously fill solder into the welding grooves (23) on both sides of the welded part (2); A cladding device (8), arranged at a cladding station, for forming the wear-resistant and corrosion-resistant structure (3) and cladding the wear-resistant and corrosion-resistant coating (4); A transmission component (6) is used to translate the rotary clamping workbench (5) from the welding station to the cladding station.

Images