Machining method and equipment for rigid casing centralizer

Abstract

The invention discloses a machining method and equipment for rigid casing centralizers, and relates to the technical field of metal casing part combination machining, and the method comprises the following steps: cutting a metal pipe with the size equivalent to the length of N rigid casing centralizers as a blank pipe, and prefabricating a strip-shaped metal piece containing N centralizing edges as a welding piece; the welding part is positioned in the length direction of the blank pipe and then welded to the outer surface of the blank pipe, and an assembly part is obtained; the method comprises the following steps: firstly, stacking materials on a to-be-cladded forming part on the surface of an assembly part through a local cladding forming process to form a wear-resistant and corrosion-resistant structure, and then integrally cladding a wear-resistant and corrosion-resistant coating on the surface of the assembly part through a coating cladding process to obtain a cladding part; and after the heat treatment part is hung on the cladding part, the cladding part is cut along the connecting part between the adjacent centralizing edges, and N rigid casing centralizers are obtained. According to the invention, 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, so that the production efficiency is improved.

Description

Technical Field

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

[0002] The casing centralizer is an important cementing tool to ensure the centering degree of the casing, and plays an important role in improving the quality of cementing. One of the more commonly used casing centralizers is the rigid casing centralizer. According to the different ways of forming the centralizing edge, the processing of the rigid casing centralizer is also divided into integral processing or welding processing. The integral processing usually adopts the forging method. Although it can obtain dense metal structure and high mechanical properties, it requires the help of complex forming molds, and high-temperature heating also consumes more energy. For example, this type of process can be found in the invention patent with application number CN202210836563.9 and invention name "A processing method for an integral rigid cyclone casing centralizer".

[0003] The welding process is to weld the stabilizing edges one by one to the pre-cut centralizer body by welding. Although it does not require complex forming molds, there are problems such as cumbersome welding positioning operations and low production efficiency when processing a single piece. In addition, in order to improve the overall mechanical properties of the rigid casing centralizer, the centralizer body and the stabilizing edges generally need to be made of higher-priced alloy steel materials. 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, a strip metal part including N centralizing edges is prefabricated as a welded part, a connecting part is provided between adjacent centralizing edges of the welded part, and welding grooves are manufactured on both sides of the part where the bottom of the welded part is connected to the blank tube;

[0008] Among them, N ≥ 3;

[0009] Step 2, welding assembly

[0010] After positioning the welded parts in step 1 along the length direction of the blank tube, fill the welding groove with solder, weld the welded parts to the outer surface of the blank tube, and weld more than 3 welded parts to the outer surface of each blank tube to obtain an assembly;

[0011] Step 3, Cladding

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

[0013] Step 4: Heat treatment

[0014] The cladding part obtained in step 4 is sent into a heat treatment furnace by hanging, and is 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 connecting portion between adjacent straightening edges to obtain N rigid casing straighteners.

[0017] The preparation process of the weldment in the above step 1 is that the prefabrication process of the weldment 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 that the part to be clad includes the arc-shaped top of each straightening edge, which is used to improve the wear resistance and corrosion resistance of the arc-shaped top of the straightening edge 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 edge, 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: Cut and polish the 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 solid solution aging. Annealing is used to eliminate residual stress inside the material, refine grains and improve processing performance, in preparation for solid solution. Solid solution is used to fully dissolve alloy elements into the assembly to form a saturated solid solution, in preparation for aging treatment, and to improve material 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] A rotating clamping workbench is used to clamp the blank tube and drive the blank tube to rotate;

[0029] A welding device, arranged at a welding station, for simultaneously filling solder into the welding grooves on both sides of the welded part;

[0030] Cladding device, arranged at the cladding station, used for forming wear-resistant and corrosion-resistant structure and cladding wear-resistant and corrosion-resistant coating;

[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 welding parts are arranged on the outer surface of each blank tube along its length direction, and the welding parts include a plurality of straightening edges connected by a connecting part. A plurality of casing straightener products can be obtained at one time by cutting the welded welding parts and the blank tube. Compared with the prior art method of welding the straightening edges to the blank tube one by one during separate production, a plurality of casing straighteners 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 edges, improves production efficiency, and can also reduce the phenomenon of uneven welding caused by frequent manual welding of a plurality of straightening edges on the blank tube.

[0034] The parts to be clad and formed in the present invention include the arc-shaped top of each straightening edge, which improves the wear resistance and corrosion resistance of the arc-shaped top of the straightening edge 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 straightener 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 the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In the attached picture:

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

[0038] Figure 2 It is a schematic diagram of the welded parts and the blank tube structure;

[0039] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[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 partial structure of the welded parts;

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

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

[0047] 1. Raw 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 in conjunction with 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 processing method for a rigid casing centralizer comprises the following steps:

[0051] Step 1, material preparation

[0052] A metal tube with a size equivalent to the length of N rigid casing centralizers is cut as a blank tube 1, and a strip metal piece including N centralizing edges 21 is prefabricated as a weldment 2, with a connecting portion 22 between adjacent centralizing edges 21 of the weldment 2, and welding grooves 23 are manufactured on both sides of the portion where the bottom of the weldment 2 is connected 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, and 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 are set 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, corrosion-resistant materials (corrosion-resistant materials may be nickel-chromium alloy powder or nickel-chromium alloy, etc.) are first deposited on the to-be-clad forming part of the surface of the assembly obtained in step 2 through a local cladding forming process to form a wear-resistant and corrosion-resistant structure 3, and then a layer of wear-resistant and corrosion-resistant coating 4 (wear-resistant and corrosion-resistant coating 4 may 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 clad 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 additive manufacturing using the local cladding molding process to ensure that the rigid casing straightening device resists wear during use. Figure 7 Further illustration shows that Figure 6 After cladding at the middle C, the wear-resistant and corrosion-resistant structure 3 is only a small arc shape 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 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 edge 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 edge 21 of each single rigid casing straightening device product finally obtained. At the same time, the outer surface of each single rigid casing straightening device product is covered with a wear-resistant and corrosion-resistant coating 4, and the overall wear-resistant and corrosion-resistant performance is also guaranteed, thereby improving its service life.

[0064] Due to the adoption of the cladding technology of the present invention, the blank tube 1 can be made of cheaper common steel tubes, thus saving manufacturing costs.

[0065] Step 4: Heat treatment

[0066] The cladding part obtained in step 4 is sent to the heat treatment furnace by hanging, and is 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 the heat-treated part. The long pipe is prevented from bending and deforming during the heat treatment by hanging.

[0067] The heat treatment system in this step can be annealing, or annealing combined with solid solution treatment and aging treatment. Annealing is used to eliminate residual stress inside the material, refine grains and improve processing performance, in preparation for solid solution treatment, which is used to fully dissolve alloy elements into the assembly to form a saturated solid solution, in preparation for aging treatment, and to improve material 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 straighteners.

[0070] In the present embodiment, a plurality of welding parts 2 are arranged on the outer surface of each blank tube 1 along its length direction, and the welding parts 2 include a plurality of straightening edges 21 connected by a connecting portion 22. A plurality of rigid casing straightener products are obtained at one time by cutting and welding the welding parts 2 and the blank tube 1. Compared with the prior art method of welding the straightening edges 21 to the blank tube 1 one by one when a single piece is independently produced, a plurality of casing straighteners can be produced at one time, which greatly reduces the number of times of clamping and disassembling the blank pipe and frequently welding the straightening edges 21, improves production efficiency, and reduces the phenomenon of uneven welding caused by frequent welding of a plurality of straightening edges 21 on the blank tube 1.

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

[0072] Step 6: Cut and polish the 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 Embodiment 1.

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

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

[0080] The rotating clamping workbench 5 includes two sets of symmetrically arranged pipe clamping tools, which include a base 52 and a clamping chuck 51 arranged thereon. The two clamping chucks 51 are located at both ends of the blank tube 1, respectively clamping the inner wall of the blank tube 1. The two clamping chucks 51 can drive the blank tube 1 to rotate, which is convenient for switching angles to weld multiple welding parts 2 on the outer surface of the blank tube 1, and is convenient for subsequent processes to perform local cladding molding and coating cladding processes on the assembly. The base 52 is arranged on the transmission component 6, which can drive the assembly to move to different stations along the transportation direction of the transmission component 6.

[0081] The welding device 7 is arranged at the welding station, and is used to simultaneously fill the welding groove 23 on both sides of the weld 2 with solder. The welding device 7 is a welding robot, and at least two welding robots are arranged on both sides of the transmission assembly 6, and can weld the weld 2 to the blank tube 1 on both sides of the weld 2. In order to avoid the two welding robots welding on both sides of the same position of the weld 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 weld 2 when welding the same weld 2, that is, the control system program is set so that when welding the same weld 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 in step 1 of prefabricating the weldment 2. The temperature rise of the parts during the forming of the wear-resistant and corrosion-resistant structure 3 can be fully utilized to achieve the preheating effect before the coating is clad. For example, the weldment 2 in the vertical direction is defined as a 0° weldment, and the weldment 2 in the horizontal direction is defined 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, and the above are only examples. Moreover, as required, 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 rotating clamping worktable 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 specific implementation 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 piece including N centralizing edges (21) is prefabricated as a welded piece (2), a connecting portion (22) is provided between adjacent centralizing edges (21) of the welded piece (2), and welding grooves (23) are manufactured on both sides of the portion where the bottom of the welded piece (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, 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; Step 3, Cladding First, a material is deposited on the part to be clad and formed on the surface of the assembly 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 by a coating cladding process to obtain a clad part; Step 4: Heat treatment The cladding part obtained in step 4 is sent into a heat treatment furnace by hanging, and is 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: The 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 portion to be clad and formed in step 3 includes the arc-shaped top of each straightening edge (21).

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 in step 3 adopt wire / powder laser cladding technology.

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

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

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

9. 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.

10. A processing device for a rigid casing centralizer, used for implementing the processing method according to any one of claims 1 to 9, characterized in that: include: A rotating clamping workbench (5) is used to clamp the blank tube (1) and drive the blank tube (1) to rotate; A welding device (7) is arranged at a welding station and is used to simultaneously fill solder into the welding grooves (23) on both sides of the welding piece (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 worktable (5) from the welding station to the cladding station.

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