A laser forming process for improving the surface roughness of fuel injection pipeline

Abstract

The present invention discloses a laser forming process for improving the surface roughness of a fuel pipeline for boosting, including constructing a three-dimensional model of a fuel pipeline for boosting an aircraft engine, processing the three-dimensional model in layers, and designing processing parameters and laser scanning paths, wherein the processing parameters include contour process parameters, upper surface process parameters, lower surface process parameters, and entity process parameters, adjusting the positional relationship between the three-dimensional model and a substrate, generating a final printing file, and performing layer-by-layer powder laying, channel contour, and entity part scanning to finally form a fuel pipeline for boosting. The present invention ensures smooth printing by optimizing contour process parameters; ensures low roughness of the flow channel by optimizing lower surface parameters; in addition, by adjusting the placement of parts, bulges caused by high contour energy input can be avoided, thereby greatly improving the surface roughness of the fuel pipeline for boosting.

Description

Technical Field

[0001] The invention relates to a laser forming process, in particular to a laser forming process for improving the surface roughness of a fuel supply pipeline. Background Art

[0002] After reaching the maximum state, the engine continues to increase thrust, which is called engine afterburner. When taking off, climbing, and military aircraft maneuvering, the aircraft needs greater thrust. Engine afterburner is the best way to increase thrust in a short time. The excellent oil flow performance of afterburner fuel supply pipeline parts is the basis, and the premise of excellent flow performance is the smaller roughness inside the pipeline.

[0003] At present, when the afterburner oil supply pipeline is manufactured, due to the excessively high contour parameters, its energy input is too high, which will increase the tendency of bulging during the printing process. In addition, the degree of adaptation between the lower surface parameters and the entity parameters is not considered during the forming process; therefore, the roughness of the existing afterburner oil supply management after forming is poor, which needs to be solved urgently. Summary of the invention

[0004] The purpose of the present invention is to provide a laser forming process for improving the surface roughness of the fuel injection pipeline in order to solve the problems raised in the above background technology.

[0005] The purpose of the present invention is to be achieved through the following technical solutions:

[0006] A laser forming process for improving the surface roughness of an afterburner fuel supply pipeline includes constructing a three-dimensional model of an aircraft engine afterburner fuel pipeline, processing the three-dimensional model in layers, and designing processing parameters and laser scanning paths, wherein the processing parameters include contour process parameters, upper surface process parameters, lower surface process parameters, and entity process parameters, adjusting the positional relationship between the three-dimensional model and a substrate, generating a final printing file, performing powder laying, channel contour scanning, and entity part scanning layer by layer, and finally forming the afterburner fuel pipeline.

[0007] The profile process parameters are determined by the following method, comprising the following steps:

[0008] a. Use at least 10 groups of different combinations of contour parameters to print corresponding contour feature structural parts;

[0009] b. Preliminarily screen the surface roughness of the contour feature structural parts obtained by printing in step a through a roughness comparison block, and select 5 groups of contour feature structural parts with better roughness;

[0010] c. Performing a roughness quantitative analysis on the five groups of contour feature structural parts with better roughness selected in step b by using a roughness measuring instrument, and performing a porosity comparative analysis by using an optical microscope to select a group of contour feature structural parts with the best roughness, and then determining the contour process parameters;

[0011] The lower surface process parameters are determined by the following method, comprising the following steps:

[0012] d. Use at least 5 groups of different combinations of contour parameters to print corresponding lower surface feature structural parts;

[0013] e. Preliminarily screen the surface roughness of the lower surface characteristic structural parts obtained by printing in step a through a roughness comparison block, and select three groups of lower surface characteristic structural parts with better roughness;

[0014] f. Performing a microscopic comparative analysis of the lower surface morphology of the three groups of lower surface characteristic structural parts with better roughness screened out in step e through an optical microscope to select a group of lower surface characteristic structural parts with the best roughness, and then determine the lower surface process parameters;

[0015] After the contour process parameters, upper surface process parameters, lower surface process parameters and entity process parameters are determined, the determined processing parameters are adopted, and multiple part placement angles are used to print out the corresponding characteristic structural parts, and comparative analysis is carried out through a roughness measuring instrument and an optical microscope to determine the optimal part placement angle.

[0016] Preferably, in step a, 15 groups of contour parameters with different combinations are used to print and form corresponding lower surface feature structural parts.

[0017] Preferably, in step a, the control range of the contour laser power is 160-300 W, the control amplitude is 20, and the control range of the contour scanning rate is 250-600 mm / s, the control amplitude is 50.

[0018] Preferably, in step d, 10 groups of contour parameters with different combinations are used to print and form corresponding lower surface feature structural parts.

[0019] Preferably, in step d, the control range of the lower surface laser power is 140-220 W, and the control range is 20; the control range of the lower surface scanning rate is 1400-2400 mm / s, and the control range is 200.

[0020] Preferably, the plurality of parts placement angles include 0°, 15°, 30°, 45°, 130°, 145°, 165° and 180°.

[0021] The beneficial effects of the present invention are as follows: compared with the prior art, the present invention ensures smooth printing by optimizing contour process parameters; ensures low roughness of the flow channel by optimizing lower surface parameters; and finds the best matching parameters between the lower surface and the entity parameters by analyzing the roundness of the lower surface profile. In addition, adjusting the placement of parts can avoid bulges caused by high contour energy input, thereby greatly improving the surface roughness of the boost fuel supply pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the partial roundness of a fuel injection pipeline manufactured by a laser forming process for improving the surface roughness of the fuel injection pipeline according to the present invention.

[0023] Figure 2 for Figure 1 An enlarged view of the boost fuel line is shown. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and through specific implementation methods. It should be understood that the embodiments described herein are only used to explain the present invention, rather than to limit the present invention.

[0025] Please refer to Figure 1 and Figure 2 As shown, Figure 1 The figure is a schematic diagram of the roundness of a fuel injection pipeline manufactured by a laser forming process for improving the surface roughness of the fuel injection pipeline according to the present invention. Figure 2 for Figure 1 An enlarged view of the boost fuel line is shown.

[0026] In this embodiment, a laser forming process for improving the surface roughness of an afterburner fuel supply pipeline includes constructing a three-dimensional model of an aircraft engine afterburner fuel pipeline, processing the three-dimensional model in layers, and designing processing parameters and laser scanning paths, wherein the processing parameters include contour process parameters, upper surface process parameters, lower surface process parameters, and entity process parameters, adjusting the positional relationship between the three-dimensional model and the substrate, generating a final printing file, performing powder laying, channel contour, and entity part scanning layer by layer, and finally forming the afterburner fuel pipeline.

[0027] The profile process parameters are determined by the following method, comprising the following steps:

[0028] a. Use 15 groups of different combinations of contour parameters to print corresponding contour feature structural parts;

[0029] b. Preliminarily screen the surface roughness of the contour feature structural parts obtained by printing in step a through a roughness comparison block, and select 5 groups of contour feature structural parts with better roughness;

[0030] c. Performing a roughness quantitative analysis on the five groups of contour feature structural parts with better roughness selected in step b by using a roughness measuring instrument, and performing a porosity comparative analysis by using an optical microscope to select a group of contour feature structural parts with the best roughness, and then determining the contour process parameters;

[0031] The lower surface process parameters are determined by the following method, comprising the following steps:

[0032] d. Use 10 groups of different combinations of contour parameters to print the corresponding lower surface feature structural parts;

[0033] e. Preliminarily screen the surface roughness of the lower surface characteristic structural parts obtained by printing in step a through a roughness comparison block, and select three groups of lower surface characteristic structural parts with better roughness;

[0034] f. Performing a microscopic comparative analysis of the lower surface morphology of the three groups of lower surface characteristic structural parts with better roughness screened out in step e through an optical microscope to select a group of lower surface characteristic structural parts with the best roughness, and then determine the lower surface process parameters;

[0035] After the contour process parameters, upper surface process parameters, lower surface process parameters and entity process parameters are determined, the determined processing parameters are adopted, and multiple part placement angles are used to print out the corresponding characteristic structural parts, and comparative analysis is carried out through a roughness measuring instrument and an optical microscope to determine the optimal part placement angle.

[0036] Specifically, in this embodiment, the control range of the profile laser power in step a is 160-300W, the control amplitude is 20, and the control range of the profile scanning rate is 250-600mm / s, the control amplitude is 50, as shown in the following table:

[0037] Serial number power speed Serial number power speed 1 160 250 9 180 400 2 160 300 10 200 400 3 160 350 11 220 400 4 160 400 12 240 400 5 160 450 13 260 400 6 160 500 14 280 400 7 160 550 15 300 400 8 160 600

[0038] Through quantitative analysis of roughness and comparative analysis of porosity, it was concluded that the roughness of the contour feature structural parts was better when the contour process parameters were 220W laser power and 400mm / s scanning speed.

[0039] Specifically, in this embodiment, the control range of the lower surface laser power in step d is 140-220W, and the control range is 20; the control range of the lower surface scanning rate is 1400-2400mm / s, and the control range is 200; as shown in the following table:

[0040] Serial number power speed Serial number power speed X1 140 1800 X6 180 1400 X2 160 1800 X7 180 1600 X3 180 1800 X8 180 2000 X4 200 1800 X9 180 2200 X5 220 1800 X10 180 2400

[0041] Through microscopic comparative analysis, it was concluded that the roughness of the lower surface characteristic structural parts was better when the lower surface process parameters were 140W laser power and 1800mm / s scanning speed.

[0042] Specifically, in this embodiment, the multiple parts placement angles include 0°, 15°, 30°, 45°, 130°, 145°, 165° and 180°.

[0043] Through comparative analysis using a roughness meter and an optical microscope, it was determined that a placement angle of 165° was optimal.

[0044] Finally, the optimal processing parameters and placement angles are determined, the final printing file is generated, and the powder is laid layer by layer, the channel contour and the solid part are scanned, and finally the fuel pipeline for boost is formed. The roundness of the fuel pipeline for boost is as follows: Figure 1 , Figure 2 As shown, the roughness results are as follows:

[0045] Serial number 1 2 3 4 5 6 average value Numeric 5.383 4.006 6.001 4.702 4.989 3.869 5.016

[0046] It can be seen from the above table that the roundness and roughness of the entire afterburner fuel pipeline are both good.

[0047] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subjected to various changes and modifications, which are within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims.

Claims

1. A laser forming process for improving the surface roughness of an afterburner fuel supply pipeline, comprising constructing a three-dimensional model of an aircraft engine afterburner fuel pipeline, processing the three-dimensional model in layers, and designing processing parameters and laser scanning paths, wherein the processing parameters include contour process parameters, upper surface process parameters, lower surface process parameters, and entity process parameters, adjusting the positional relationship between the three-dimensional model and the substrate, generating a final printing file, performing powder laying, channel contour and entity part scanning layer by layer, and finally forming an afterburner fuel pipeline, characterized in that: The profile process parameters are determined by the following method, comprising the following steps: a. Use at least 10 groups of different combinations of contour parameters to print corresponding contour feature structural parts; b. Preliminarily screen the surface roughness of the contour feature structural parts obtained by printing in step a through a roughness comparison block, and select 5 groups of contour feature structural parts with better roughness; c. Performing a roughness quantitative analysis on the five groups of contour feature structural parts with better roughness selected in step b by using a roughness measuring instrument, and performing a porosity comparative analysis by using an optical microscope to select a group of contour feature structural parts with the best roughness, and then determining the contour process parameters; The lower surface process parameters are determined by the following method, comprising the following steps: d. Use at least 5 groups of different combinations of contour parameters to print corresponding lower surface feature structural parts; e. Preliminarily screen the surface roughness of the lower surface characteristic structural parts obtained by printing in step a through a roughness comparison block, and select three groups of lower surface characteristic structural parts with better roughness; f. Performing microscopic comparative analysis of the lower surface morphology of the three groups of lower surface characteristic structural parts with better roughness screened out in step e through an optical microscope to select a group of lower surface characteristic structural parts with the best roughness, and then determining the lower surface process parameters; After the contour process parameters, upper surface process parameters, lower surface process parameters and entity process parameters are determined, the determined processing parameters are used, and multiple parts placement angles are used to print out the corresponding characteristic structural parts, and the roughness measuring instrument and optical microscope are used for comparative analysis to determine the optimal part placement angle; In step a, the control range of the contour laser power is 160-300W, the control amplitude is 20, and the control range of the contour scanning rate is 250-600mm / s, the control amplitude is 50; In step d, the control range of the lower surface laser power is 140-220W, and the control range is 20; the control range of the lower surface scanning rate is 1400-2400mm / s, and the control range is 200.

2. The laser forming process for improving the surface roughness of the fuel injection pipeline according to claim 1, characterized in that: In step a, 15 groups of contour parameters with different combinations are used to print the corresponding lower surface feature structural parts.

3. The laser forming process for improving the surface roughness of a fuel injection pipeline according to claim 1, characterized in that: In step d, 10 groups of contour parameters with different combinations are used to print the corresponding lower surface feature structural parts.

4. The laser forming process for improving the surface roughness of a fuel injection pipeline according to claim 1, characterized in that: The multiple parts placement angles include 0°, 15°, 30°, 45°, 130°, 145°, 165° and 180°.

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