Automatic welding tool and machining method for oil injection rod assembly

Abstract

The automatic welding tool comprises a clamp, a through hole matched with the outer shape of a connector of the oil injection rod assembly is formed in the clamp, and a profiled groove tightly attached to a boss part is formed in one end face of the clamp. According to the welding clamp and the novel welding method, the purposes of preventing welding leakage, improving the welding quality and ensuring that the part can meet the corresponding size requirement after being welded are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of processing an aero-engine fuel injection rod assembly, and in particular relates to an automatic welding tool and a processing method for a fuel injection rod assembly. Background Art

[0002] The fuel injection rod assembly, as one of the important components of the fuel main assembly, is mainly used to stably provide fuel to the afterburner to ensure the normal combustion of the engine combustion chamber and the engine can stably provide power. The indicators for evaluating its performance include flow rate, distribution, and injection direction. These three indicators have a direct and important impact on the combustion efficiency of the engine afterburner and the temperature field during combustion. In order to ensure the uniform distribution of the combustion chamber temperature field and avoid ablation of the afterburner due to local high temperature, the fuel injection rod assembly flow rate, distribution, and injection direction must be qualified.

[0003] The fuel injection rod assembly consists of a pipe, a boss, a through rod, a plug and other zero welding components, such as Figure 1 As shown in the figure, the boss is the link between the through rod and the conduit. Therefore, the quality of the weld processing at the boss will inevitably have a direct impact on the performance indicators such as the main pipe flow, distribution, and injection direction. In addition, due to the special joint form at the weld and the large difference in material thickness, the manual welding method is used, and the inner cavity size after welding is unqualified and the ball cannot be passed. The welding quality is difficult to guarantee, resulting in a low welding qualification rate and affecting the performance of the parts such as flow.

[0004] The Chinese utility model patent with publication number CN205147523U discloses an adjustable fixture for electrospark machining microholes of a fuel injection rod. The fixture is designed to address the processing drawbacks of the fuel injection holes on the fuel injection rod. However, the device is not suitable for the welding operation of this scheme. At the same time, no related fixtures are found in the field of the fuel injection rod boss weld. Therefore, it is necessary to design and manufacture corresponding welding fixtures and adopt new welding methods to prevent welding leaks, improve welding quality, and ensure that the parts can meet the corresponding size requirements after welding. Summary of the invention

[0005] In order to solve the above problems, the present invention aims to provide an automatic welding tool and a processing method for a fuel injection rod assembly.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an automatic welding tool for a spray rod assembly, comprising a clamp, a through hole matching the external shape of the spray rod assembly joint is arranged inside the clamp, and a groove tightly fitting with the boss part is opened on one end face of the clamp.

[0007] Preferably, the through hole is composed of three sections of cylindrical holes, the radii of the cylindrical holes at both ends are consistent, and the radius of the middle cylindrical hole is smaller than the radii of the cylindrical holes at both ends.

[0008] Preferably, the groove is formed integrally with the cylindrical hole, and the groove is recessed along the clamp.

[0009] Preferably, the clamp is of an upper and lower opening and closing type.

[0010] A method for welding a fuel injection rod assembly comprises the following steps:

[0011] Step 1: Get the boss and other parts to be welded;

[0012] Step 2: Open the fixture, clamp the boss and other parts to the automatic welding fixture, and place the boss in the groove;

[0013] Step 3: Clamp the fixture onto the automatic welding equipment and perform automatic argon arc welding operation;

[0014] Step 4: After welding is completed, remove the fixture and processed parts.

[0015] Preferably, special tooling is used to limit the parts during the welding process.

[0016] Compared with the prior art, the present invention has the following advantages: the device has a simple structure, low production cost, easy operation, and a significant effect in improving the welding qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the joint of the fuel injection rod assembly in the present invention;

[0019] Figure 2 It is a front view of the fixture in the present invention;

[0020] Figure 3 for Figure 2 AA section view;

[0021] Figure 4 It is a right side view of the fixture in the present invention;

[0022] Figure 5 It is a partial three-dimensional schematic diagram of the tooling fixture groove in the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0024] An automatic welding fixture and processing method for a fuel injection rod assembly are proposed to solve the technical bottleneck problems of unqualified welding dimensions and low welding qualification rate of the fuel injection rod assembly.

[0025] The technical solution of the present invention is:

[0026] In order to realize the automatic welding of the fuel injection rod assembly, special tooling is used to limit the parts. Figure 2-Figure 4 The fixture is used in the welding process of parts. Its main functions are: clamping and automatic welding of bosses. In order to realize the automatic welding of the spray rod assembly, the fixture is designed and manufactured as follows:

[0027] a) Design fixtures that are compatible with automatic welding equipment, such as Figure 2-Figure 5 As shown,

[0028] b) Design a groove that can fit tightly with the boss part, such as Figure 5 shown.

[0029] The automatic welding fixture includes a fixture, a through hole matching the external shape of the joint of the fuel injection rod assembly is arranged inside the fixture, and a groove that fits tightly with the boss part is opened on one end surface of the fixture. The through hole is composed of three sections of cylindrical holes, the radius of the cylindrical holes at both ends is the same, and the radius of the cylindrical hole in the middle is smaller than the radius of the cylindrical holes at both ends. The groove is formed integrally with the cylindrical hole, and the groove is sunken along the fixture. The fixture is an upper and lower opening and closing type.

[0030] Usage requirements: Assemble on the fixture without positioning welding to avoid uneven welds caused by positioning points. Clamp the fixture on the automatic welding equipment to proceed with subsequent operations.

[0031] The specific processing method to control the welding deformation of the fuel main pipe boss is as follows:

[0032] Step 1: Get the boss and other parts to be welded;

[0033] Step 2: Open the fixture and clamp the boss and other parts to the automatic welding fixture;

[0034] Step 3: Perform automatic argon arc welding operation by pressing a button;

[0035] Step 4: After welding is completed, remove the fixture and processed parts.

[0036] The invention has the advantages of providing a technical solution for automatic welding of a fuel injection rod assembly, which has the advantages of low cost, easy operation, simple device and remarkable effect of improving welding qualification rate.

[0037] The above is a detailed introduction to the automatic welding tooling and processing method of the fuel injection rod assembly provided by the present invention. The structure and working principle of the present invention are described in detail using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, the present invention can also be improved and modified without departing from the principle of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An automatic welding tool for a fuel injection rod assembly, characterized in that: The utility model comprises a clamp, wherein a through hole matching the external shape of the joint of the fuel injection rod assembly is arranged inside the clamp, and a groove closely fitting with the boss part is opened on one end surface of the clamp.

2. The automatic welding tool for the fuel spray rod assembly according to claim 1 is characterized in that: The through hole is composed of three sections of cylindrical holes, the radii of the cylindrical holes at both ends are consistent, and the radius of the cylindrical hole in the middle is smaller than the radii of the cylindrical holes at both ends.

3. The automatic welding tool for the fuel spray rod assembly according to claim 1 is characterized in that: The groove is formed integrally with the cylindrical hole, and the groove is indented along the fixture.

4. The automatic welding tool for the fuel spray rod assembly according to claim 1 is characterized in that: The clamp is of an upper and lower opening and closing type.

5. A method for welding a fuel injection rod assembly using the automatic welding tool according to any one of claims 1 to 4, characterized in that: The following steps are included: Step 1: Get the boss and other parts to be welded; Step 2: Open the fixture, clamp the boss and other parts to the automatic welding fixture, and place the boss in the groove; Step 3: Clamp the fixture onto the automatic welding equipment and perform automatic argon arc welding operation; Step 4: After welding is completed, remove the fixture and processed parts.

6. The automatic welding method for the fuel injection rod assembly according to claim 5, characterized in that: During the welding process, special tooling is used to limit the parts.

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