A precision cylindrical structure welding processing method

Abstract

The application belongs to the technical field of welding processing, and provides a precise cylindrical structure welding processing method. The technical scheme of the application is characterized in that: firstly, a rotary center frame is used to fix the to-be-welded part, so that the coaxial precision of the long cylindrical structure welding can be effectively improved; secondly, the rotary center frame is used to fix the heating resistance wire, so that the preheating of the welding position and the stress relief treatment of the part after welding can be realized.

Description

A Precision Cylindrical Structure Welding Process Technical Field

[0001] This invention belongs to the field of welding processing technology, and in particular relates to a method for welding precision cylindrical structures. Background Technology

[0002] Precision cylindrical structures are among the most commonly used components in hydraulic cylinders. They achieve their intended function through the regular movement of a piston within the cylinder. To ensure stable pressure and smooth movement, the cylinder requires high precision in both its internal diameter and shape. While existing precision cylindrical manufacturing technologies are relatively mature, certain shortcomings still exist in practical applications.

[0003] When the cylindrical structure is complex or specialized, limitations in processing technology may prevent the integral machining of the cylinder. In such cases, separate precision machining is required, followed by welding to ensure the high dimensional and positional accuracy of the final product. Precision structural welding typically employs methods such as laser, electron beam, and high-energy beam welding. While these methods offer advantages such as low heat input, minimal welding deformation, low residual stress, and high weld quality, the unavoidable welding deformation and residual stress make coaxiality control during the welding of precision cylindrical structures quite challenging.

[0004] Therefore, developing a welding method for precision long cylindrical structures to solve the problem of coaxiality control during the welding of precision cylindrical structures is an urgent technical problem to be solved in this field. Summary of the Invention

[0005] This invention provides a method for welding precision cylindrical structures, aiming to solve the problem of difficulty in controlling coaxiality during the welding of precision cylindrical structures.

[0006] This invention is implemented as follows: a precision cylindrical structure welding processing method, the processing method steps are as follows:

[0007] Step S1: Assemble suitable bearing bushes and bearings around the parts to be welded;

[0008] Step S2: Install the components to be welded, equipped with bearing bushes and bearings, into the rotary center frame respectively;

[0009] Step S3: Install the heating resistance wire into the rotary center frame;

[0010] Step S4: Install the rotary center frame with the component to be welded and the rotary center frame with the heating resistance wire onto the guide rail of the positioner.

[0011] Step S5: Adjust the rotary center frame with the part to be welded to a suitable position along the guide rail of the positioner and fix it. Then move the rotary center frame with the heating resistance wire along the guide rail of the positioner to the vicinity of the welding point and fix it.

[0012] Step S6: Power on the rotary center frame with heating resistance wire to preheat the part to be welded;

[0013] Step S7: After preheating is completed, release the fixing of the rotary center frame with heating resistance wire and move it away from the welding position along the guide rail of the positioner.

[0014] Step S8: Use the rotating device on the positioner to drive the part to be welded to rotate, and then use an automatic welding machine to weld the welding position;

[0015] Step S9: After welding is completed, move the rotary center frame with heating resistance wire back to the welding position and fix it.

[0016] Step S10: Power on the rotary center frame with heating resistance wire to relieve stress on the welded parts.

[0017] Optionally, the rotary center frame includes a base, an end cap, and a connecting fastener. The end cap is rotatably connected to one side of the upper part of the base, and the connecting fastener is provided on the other side.

[0018] Optionally, the connecting fastener is a bolt and nut.

[0019] Optionally, the annular cavity formed by the base and the end cap mates with the bearing.

[0020] Optionally, the inner diameter of the heating resistance wire is larger than the outer diameter of the part to be welded.

[0021] The beneficial technical effects of implementing the present invention are as follows: By applying the technical solution of the present invention, firstly, the rotating center frame is used to fix the workpiece to be welded, which can effectively improve the coaxiality accuracy of welding long cylindrical structures; secondly, the rotating center frame is used to fix the heating resistance wire, which can realize the preheating of the welding part and the stress relief treatment of the welded parts. Attached Figure Description

[0022] Figure 1 is a schematic diagram of the processing of the present invention;

[0023] Figure 2 is a schematic diagram of the rotary center frame of the present invention;

[0024] Figure 3 is a schematic diagram of the installation of the bearing bush and bearing of the present invention;

[0025] Figure 4 is a schematic diagram of the cooperation between the heating resistance wire and the rotary center frame of the present invention.

[0026] In the diagram: 1. Rotary center frame; 101. Base; 102. End cap; 2. Bearing bush; 3. Bearing; 4. Positioner; 401. Guide rail; 402. Rotating device; 5. Heating resistance wire; 6. Automatic welding machine. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0028] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, and "several" means one or more.

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] As shown in Figures 1-4, a precision cylindrical structure welding process is described, and the steps are as follows:

[0031] Step S1: Assemble the appropriate bearing bush 2 and bearing 3 around the part to be welded;

[0032] Step S2: Install the components to be welded, which are equipped with bearing bush 2 and bearing 3, into the rotary center frame 1 respectively;

[0033] Step S3: Install the heating resistance wire 5 into the rotary center frame 1;

[0034] Step S4: Install the rotary center frame 1 with the component to be welded and the rotary center frame 1 with the heating resistance wire 5 onto the guide rail 401 of the positioner 4.

[0035] Step S5: Adjust the rotary center frame 1 with the part to be welded to a suitable position along the guide rail 401 of the positioner 4 and fix it. Then move the rotary center frame 1 with the heating resistance wire 5 along the guide rail 401 of the positioner 4 to the vicinity of the welding point and fix it.

[0036] Step S6: Power on the rotary center frame 1 with heating resistance wire 5 to preheat the part to be welded;

[0037] Step S7: After preheating is completed, release the fixing of the rotary center frame 1 with heating resistance wire 5, and move it away from the welding position along the guide rail 401 of the positioner 4.

[0038] Step S8: Use the rotating device 402 on the positioner 4 to drive the part to be welded to rotate, and then use the automatic welding machine 6 to weld the welding position;

[0039] Step S9: After welding is completed, move the rotary center frame 1 with heating resistance wire 5 back to the welding position and fix it.

[0040] Step S10: Power is supplied to the rotary center frame 1 with heating resistance wire 5 to relieve stress on the welded parts.

[0041] The advantage of this embodiment is that by using the rotary center frame 1 to clamp the parts to be welded and combining it with the automatic welding machine 6 and the positioner 4, the coaxiality accuracy requirements of precision long cylindrical structure welding processing can be met; at the same time, the rotary center frame 1 is used to install the heating resistance wire 5 to realize stress relief treatment of the processed parts after the technician.

[0042] As shown in Figure 2, further, the rotary center frame 1 includes a base 101, an end cap 102, and connecting fasteners. The end cap 102 is rotatably connected to one side of the base 101, and the connecting fasteners are provided on the other side.

[0043] The advantage of this embodiment is that it helps to maintain the coaxiality of the devices to be welded.

[0044] As shown in Figure 2, the connecting fasteners are bolts and nuts.

[0045] The advantages of this embodiment are that the bolt and nut connection has high stability and is easy to disassemble.

[0046] As shown in Figure 2, further, the annular cavity formed by the base 101 and the end cap 102 is fitted with the bearing 3.

[0047] As shown in Figure 4, furthermore, the inner diameter of the heating resistance wire 5 is larger than the outer diameter of the part to be welded.

[0048] The advantage of this embodiment is that it facilitates preheating of the welding device and subsequent stress treatment.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for welding and processing a precision cylindrical structure, characterized in that, The processing method steps are as follows: Step S1, assemble the corresponding bearing bush (2) and bearing (3) on the periphery of the part to be welded; Step S2, install the part to be welded equipped with the bearing bush (2) and bearing (3) into the rotary center frame (1); Step S3, install the heating resistance wire (5) into the rotary center frame (1); Step S4, install the rotary center frame (1) with the part to be welded and the rotary center frame (1) with the heating resistance wire (5) onto the guide rail (401) of the positioner (4); Step S5, adjust the rotary center frame (1) with the part to be welded to a suitable position along the guide rail (401) of the positioner (4) and fix it, and then move the rotary center frame (1) with the heating resistance wire (5) along the guide rail (401) of the positioner (4). Step S6: Install and fix the rotary center frame (1) with heating resistance wire (5) near the welding position; Step S7: After preheating, release the fixation of the rotary center frame (1) with heating resistance wire (5) and move it away from the welding position along the guide rail (401) of the positioner (4); Step S8: Use the rotating device (402) on the positioner (4) to drive the part to be welded to rotate, and then use the automatic welding machine (6) to weld the welding position; Step S9: After welding, move the rotary center frame (1) with heating resistance wire (5) back to the welding position and fix it; Step S10: Power the rotary center frame (1) with heating resistance wire (5) to relieve stress on the welding part.

2. The precision cylindrical structure welding method according to claim 1, characterized in that, The rotary center frame (1) includes a base (101), an end cap (102), and a connecting fastener. The end cap (102) is rotatably connected to one side of the base (101), and the connecting fastener is provided on the other side.

3. The precision cylindrical structure welding processing method according to claim 2, characterized in that, The connecting fasteners are bolts and nuts.

4. The precision cylindrical structure welding method according to claim 3, characterized in that, The annular cavity formed by the base (101) and the end cap (102) is fitted with the bearing (3).

5. The precision cylindrical structure welding method according to claim 1, characterized in that, The inner diameter of the heating resistance wire (5) is larger than the outer diameter of the part to be welded.

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