A beautification method for improving the appearance quality of aero-engine parts

Abstract

The present invention relates to a beautification method for improving the appearance quality of parts, including inspecting the surface quality of the parts; when beautifying cylindrical parts, after overall polishing with a casing weld grinder, setting shot peening parameters on the control screen of the numerical control automatic shot peening machine; when beautifying parts covered by the nozzle, directly setting shot peening parameters on the control screen of the numerical control automatic shot peening machine; when beautifying cylindrical parts, fixing the parts on the working turntable of the numerical control automatic shot peening machine, and performing shot peening beautification processing on the parts by means of the uniform rotation of the working turntable and the upward movement of the spray gun along the Y-axis; when beautifying parts covered by the nozzle, fixing the parts on the working turntable of the numerical control automatic shot peening machine, and performing shot peening beautification processing by means of the uniform rotation of the working table and the reciprocating up and down movement of the spray gun. The present invention makes the surface color of the parts uniform, achieves a matte effect, and improves the surface finish and consistency of the components.

Description

Technical Field

[0001] The present invention belongs to the technical field of aero-engines, and particularly relates to a beautification method for improving the appearance quality of parts. Background Art

[0002] At present, with the increasing maturity of the manufacturing technology of aero-engine products in China, the transformation from forming manufacturing to surface integrity manufacturing has been gradually carried out, which basically meets the use requirements of the engines. However, from the quality of the engine outer surface, there are still many unstable process factors in the welding, part forming, turnover protection, marking, heat treatment process and other links, resulting in poor consistency of the product appearance quality, seriously affecting the overall image of the product. In particular, the mixer casing, diffuser outer wall, and afterburner barrel are key parts in aero-engines, and the outer adjusting piece and elastic piece are the covering parts of the engine tail nozzle. The appearance quality of these parts determines the appearance of the entire engine. At present, the methods of cleaning, wiping and polishing are used to improve the appearance quality. However, it is difficult to remove oil stains and dirt only through simple cleaning and wiping. After local grinding, there is a color difference between the polished part and the unpolished part. Therefore, it is urgent to carry out research on appearance beautification to improve the appearance quality of engine parts. Summary of the Invention

[0003] Aiming at the deficiencies of the existing technology, the present invention provides a beautification method for improving the appearance quality of parts. Based on the process route of part surface inspection, surface trimming, and shot peening beautification, by combining surface automatic polishing and shot peening beautification processing, the appearance quality of parts is improved, and the appearance beauty degree and light reflection effect of titanium alloy cylinder parts including mixer casings, diffuser outer walls, and afterburner barrels and titanium alloy nozzle covering parts including outer adjusting pieces and elastic pieces are ensured.

[0004] A beautification method for improving the appearance quality of parts specifically includes the following steps:

[0005] Step 1: Inspect the surface quality of the part. For surface defects such as scratches, dents, splashes, stains, and bumps on the surface of the part cylinder, use a sandcloth wheel for overall polishing.

[0006] Step 2: When beautifying cylinder parts, after the end of Step 1, use a casing weld grinding machine for overall polishing to make the part show a metallic color. When beautifying nozzle covering parts, directly proceed to Step 3.

[0007] Step 3: Set shot peening parameters on the control panel of the numerical control automatic shot peening machine equipment.

[0008] Step 4: When beautifying cylindrical parts, fix the parts on the working turntable of the CNC automatic shot peening machine through a pressing plate, and make the center of the cylindrical part coincide with the center of the working turntable; start the equipment, and perform shot peening beautification processing on the parts by means of the uniform rotation of the working turntable and the upward movement of the spray gun along the Y-axis, with the upward movement speed being 10 mm / s;

[0009] When beautifying the nozzle covering parts, fix the parts on the working turntable of the CNC automatic shot peening machine through a pressing plate, and fix the nozzle covering parts at the center position of the working turntable of the CNC automatic shot peening machine; keep the distance between the nozzle covering parts and the nozzle within the range of 150 ± 50; start the equipment, and perform shot peening beautification processing by means of the uniform rotation of the workbench and the up-and-down reciprocating movement of the spray gun. The number of reciprocations of the spray gun is one, and the speed of the up-and-down reciprocating movement is 10 mm / s.

[0010] In the said Step 1, during the grinding process, the grinding direction must be consistent, and it is carried out one by one along the axial section. After grinding, the polishing marks should be regular and uniform; for scratches and bumps, first use a set of files and sandpaper to trim, and then use an oilstone to finely trim the surface; there is no obvious color difference on the parts after polishing.

[0011] : In the said Step 2, use the flexible manipulator in the casing weld grinder to grab the ceramic nylon brush and perform overall polishing on the outer surface of the parts to remove the residual stains on the surface of the parts and achieve the effect of uniform and beautiful color; during the polishing process, select ceramic nylon brushes of different lengths according to the height of the parts. The length of the ceramic nylon brush is not less than the polished area of the parts, and set the diameter size of the circumferential movement of the ceramic nylon brush as the sum of the outer diameter of the parts and the radius of a ceramic nylon brush. Use the self-rotation of the nylon brush and add the up-and-down reciprocating movement at the same time, with the speed of the up-and-down reciprocating movement being 10 mm / s; avoid too deep grinding and polishing marks on the surface of the parts caused by local continuous polishing; after polishing, the color of the outer surface of the parts is uniform and shows a metallic luster.

[0012] The shot peening parameters in the said Step 3 are as follows:

[0013] The nozzles are arranged in a straight line, and the number of nozzles is 1 - 3;

[0014] The angle between the center line of the nozzle and the outer surface of the part: 35° - 90°;

[0015] Pressure: 0.2 MPa - 0.5 MPa;

[0016] Shot flow rate: 1 Kg / min - 5 Kg / min;

[0017] Working turntable speed: 25 r / min - 40 r / min;

[0018] The distance between the nozzle and the surface of the part: 150 mm ± 50 mm.

[0019] In the shrinkage prevention step 3, glass beads that meet the requirements of HB / Z 26 are selected as the projectiles. The size specification of the projectiles is selected according to the part structure to ensure that the part does not deform and meets the shot peening requirements.

[0020] The purpose of the pressing plate in the step 4 is to fix the position of the part, and at the same time, it is necessary to ensure that the surface of the part is within the shot peening range to ensure the shot peening effect of the part.

[0021] The beneficial effects of the present invention are as follows: through the combination of automatic polishing and shot peening and beautifying processing, the surface color of the part is uniform, achieving a matte effect, improving the surface finish and consistency of the component, comprehensively enhancing the visual integration effect, ensuring the aesthetic degree and overall surface sense; at the same time, it improves the light reflection effect generated during the use of the product, reduces the light pollution generated during the use of the product, effectively reduces the electromagnetic wave reflection generated during the use of the product, and improves the corrosion resistance of the part surface.

[0022] With the upgrading and replacement of engines, the requirements for the appearance quality of products are getting higher and higher. The combination of surface automatic polishing and shot peening and beautifying processing can improve the appearance quality of aero-engines, which is also the general trend. This method has broad market demand and application prospects in improving the surface quality of parts on aero-engines. Description of the Drawings

[0023] Figure 1 It is a flowchart for beautifying cylindrical parts in the present invention;

[0024] Figure 2 It is a flowchart for beautifying nozzle covering parts in the present invention;

[0025] Figure 3 It is a schematic diagram of shot peening and beautifying using an automatic shot peening machine in the present invention;

[0026] Among them,

[0027] 1 - spray gun, 2 - outer surface of the part, 3 - working turntable. Specific Embodiments

[0028] In order to better explain the present invention for easy understanding, the technical solutions and effects of the present invention will be described in detail below with reference to the drawings through specific embodiments.

[0029] Embodiment 1

[0030] A beautifying method for improving the appearance quality of parts, taking the mixer casing of cylindrical parts as an example, as Figure 1 shown, specifically including the following steps:

[0031] In this embodiment, the maximum size of the mixer casing is Φ1200×800mm.

[0032] Step 1: Inspect the surface quality of the part. For surface defects such as scratches, dents, spatter, stains, and bumps on the surface of the part cylinder, use a sanding wheel to perform overall polishing and repair.

[0033] During the grinding process, the grinding direction must be consistent and carried out one by one along the axial section. After grinding, the polishing marks should be regular and uniform. For scratches and bumps, first use a set of files and sandpaper to trim, and then use an oilstone to finely repair the surface. There is no obvious color difference on the polished part.

[0034] Step 2: Use a casing weld grinding machine to perform overall polishing to make the part show a metallic luster. Specifically:

[0035] Use the flexible manipulator in the casing weld grinding machine to grab the ceramic nylon brush and perform overall polishing on the outer surface 2 of the part to remove the remaining stains on the part surface and achieve a uniform and beautiful color effect. During the polishing process, select ceramic nylon brushes of different lengths according to the height of the part. The length of the ceramic nylon brush is not less than the polishing area of the part, and set the diameter size of the circumferential movement of the ceramic nylon brush to the sum of the outer diameter of the part and the radius of a ceramic nylon brush. The ceramic nylon brush rotates while adding an up-and-down reciprocating motion, and the speed of the up-and-down reciprocating motion is 10 mm / s; avoid overly deep grinding and polishing marks on the part surface caused by local continuous polishing. After polishing, the color of the outer surface 2 of the part is uniform and shows a metallic luster.

[0036] Step 3: Set the shot peening parameters on the control panel of the numerical control automatic shot peening machine. The shot peening parameters set in this embodiment are:

[0037] The nozzles are arranged in a straight line, and the number of nozzles is 3;

[0038] The angle between the center line of the nozzle and the outer surface 2 of the part: 60°;

[0039] Pressure: 0.5 MPa;

[0040] Shot flow rate: 5 Kg / min;

[0041] Speed of the working turntable 3: 40 r / min;

[0042] Distance between the nozzle and the part surface: 150 mm;

[0043] The shot used is glass shot that meets the requirements of HB / Z 26. The size specification of the shot is selected according to the part structure to ensure that the part does not deform and meets the shot peening requirements.

[0044] Step 4: As Figure 3As shown in the figure, the parts are installed and fixed on the working turntable 3 of the numerically controlled automatic shot peening machine through pressing plates. The purpose of the pressing plates is to fix the positions of the parts, and at the same time, it is necessary to ensure that the surfaces of the parts are all within the shot peening range to ensure the shot peening effect of the parts. The center of the cylindrical parts coincides with the center of the working turntable 3. Start the equipment, and perform shot peening and beautification processing on the parts by means of the uniform rotation of the working turntable 3 and the upward movement of the spray gun 1 along the Y-axis. The upward movement speed is 10 mm / s. Surface shot peening processing uses the high-speed air flow generated by compressed air to push glass beads. The high-speed glass beads are sprayed onto the surface of the workpiece to be processed through the spray gun 1, forming a plastic deformation layer. After shot peening, the surface color is uniform, achieving a matte effect, improving the appearance quality and corrosion resistance of the parts.

[0045] Example 2

[0046] A beautification method for improving the appearance quality of parts. Taking the elastic sheet of the part covered by the beautification nozzle as an example, as Figure 2 shown, it specifically includes the following steps:

[0047] In this embodiment, the size of the part is 500×300 mm.

[0048] Step 1: Check the surface quality of the part. For surface defects such as scratches, dents, splashes, stains, and bumps on the surface of the part, use a sandcloth wheel to perform overall polishing.

[0049] During the polishing process, the polishing direction must be consistent and carried out one by one along the longitudinal section. After polishing, the polishing marks should be regular and uniform. For scratches and bumps, first use a set of files and sandpaper to trim, and then use an oilstone to finely polish the surface. After polishing, the part has no obvious color difference and shows a metallic luster.

[0050] Step 2: Set the shot peening parameters on the control screen of the numerically controlled automatic shot peening machine. The shot peening parameters set in this embodiment are:

[0051] The nozzles are arranged in a straight line, and the number is 1;

[0052] The angle between the center line of the nozzle and the surface of the part: 35°;

[0053] Pressure: 0.2 MPa;

[0054] Shot peening media flow rate: 1 Kg / min

[0055] Workbench speed: 25 r / min;

[0056] The distance between the nozzle and the surface of the part: 100 mm;

[0057] The shot peening media selected is glass beads that meet the requirements of HB / Z 26. The size specification of the shot peening media can be selected according to the structure of the part to ensure that the part does not deform and meets the shot peening requirements.

[0058] Step 3: Fix the elastic sheet part at the center position of the working turntable 3 of the CNC automatic shot peening machine through a pressing plate. The purpose of the pressing plate is to fix the position of the part. At the same time, it is necessary to ensure that the surface of the part is within the shot peening range to ensure the shot peening effect of the part. The distance between the nozzle covering the part and the nozzle should be kept within the range of 150 ± 50. Start the equipment and perform shot peening and beautification processing by rotating the workbench at a constant speed and reciprocating the spray gun 1 up and down. The reciprocating number of the spray gun 1 is once, and the speed of reciprocating up and down is 10 mm / s. Surface shot peening processing uses the high-speed air flow generated by compressed air to push the glass beads. The high-speed glass beads are sprayed onto the surface of the workpiece to be processed through the spray gun 1, forming a plastic deformation layer. After shot peening, the surface color is uniform, achieving a matte effect, improving the appearance quality and corrosion resistance of the part.

Claims

1. A beautification method for improving the appearance quality of aero-engine parts, characterized in that Specifically, it includes the following steps: Step 1: Inspect the surface quality of the parts. For surface defects such as scratches, dents, spatter, stains, and bumps on the surface of the part cylinder, use a sanding wheel to perform overall polishing and repair; During the grinding process, the grinding direction must be consistent and carried out one by one along the axial section. After grinding, the polishing marks should be regular and uniform; for scratches and bumps, first use a set of files and sandpaper to trim, and then use an oilstone to finely repair the surface; there is no obvious color difference on the parts after polishing and repair; Step 2: When beautifying cylinder parts, after the end of Step 1, use a casing weld grinder to perform overall polishing to make the parts show a metallic color; when beautifying nozzle covering parts, directly proceed to Step 3; In this Step 2, use a flexible manipulator in the casing weld grinder to grab a ceramic nylon brush and perform overall polishing on the outer surface of the parts to remove the remaining stains on the parts surface, achieving a uniform and beautiful color effect; during the polishing process, select ceramic nylon brushes of different lengths according to the height of the parts. The length of the ceramic nylon brush is not less than the polishing area of the parts, and set the diameter size of the circumferential movement of the ceramic nylon brush to the sum of the outer diameter of the parts and the radius of a ceramic nylon brush. The ceramic nylon brush rotates while adding up-and-down reciprocating motion, and the speed of the up-and-down reciprocating motion is 10 mm / s; avoid overly deep grinding and polishing marks on the parts surface caused by local continuous polishing; after polishing, the color of the outer surface of the parts is uniform and shows a metallic color; Step 3: Set the shot peening parameters on the control panel of the CNC automatic shot peening machine equipment; The shot peening parameters are: The nozzles are arranged in a straight line, and the number of nozzles is 1 - 3; The angle between the center line of the nozzle and the outer surface of the parts: 35° - 90°; Pressure: 0.2 MPa - 0.5 MPa; Shot flow rate: 1 Kg / min - 5 Kg / min; Working turntable speed: 25 r / min - 40 r / min; The distance between the nozzle and the parts surface: 150 mm ± 50 mm; Select glass beads that meet the requirements of HB / Z 26 as the shot peening media. The size specification of the shot peening media is selected according to the structure of the parts to ensure that the parts do not deform and meet the shot peening requirements; Step 4: When beautifying cylinder parts, install and fix the parts on the working turntable of the CNC automatic shot peening machine through a pressing plate, and the center of the cylinder parts coincides with the center of the working turntable; Start the equipment and perform shot peening beautification processing on the parts by means of the uniform rotation of the working turntable and the upward movement of the spray gun along the Y-axis, and the upward movement speed is 10 mm / s; When beautifying nozzle covering parts, install and fix the parts on the working turntable of the CNC automatic shot peening machine through a pressing plate, and the nozzle covering parts are fixed at the center position of the working turntable of the CNC automatic shot peening machine; the distance between the nozzle covering parts and the nozzle is kept within the range of 150 ± 50; start the equipment and perform shot peening beautification processing by means of the uniform rotation of the workbench and the up-and-down reciprocating motion of the spray gun. The number of reciprocations of the spray gun is one, and the speed of the up-and-down reciprocating movement is 10 mm / s.

2. The beautification method for improving the appearance quality of aero-engine parts according to claim 1, characterized in that: The purpose of the pressing plate in Step 4 is to fix the position of the parts, and at the same time, it is necessary to ensure that the entire surface of the parts is within the range of shot peening to ensure the shot peening effect of the parts.

Images