CN112045187B - Process method for forming uniform-wall-thickness variable-diameter fuel spray rod through selective laser melting - Google Patents
Process method for forming uniform-wall-thickness variable-diameter fuel spray rod through selective laser melting Download PDFInfo
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- CN112045187B CN112045187B CN202010939860.7A CN202010939860A CN112045187B CN 112045187 B CN112045187 B CN 112045187B CN 202010939860 A CN202010939860 A CN 202010939860A CN 112045187 B CN112045187 B CN 112045187B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/20—Post-treatment, e.g. curing, coating or polishing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/247—Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
A process method for a selective laser melting and forming equal-wall-thickness variable-diameter fuel spray rod belongs to the technical field of material increase manufacturing. The process method for melting and forming the fuel spray rod with the variable wall thickness and the variable diameter in the selected laser area comprises the following steps: s1, establishing a three-dimensional model of the constant-wall-thickness variable-diameter fuel spray rod; s2, determining the forming direction of the constant-wall-thickness variable-diameter fuel spray rod; s3, adding supports; s4, setting technological parameters of selective laser melting and forming; s5, melting and forming in a laser selection area of the equal-wall-thickness reducing fuel spray rod; and S6, post-processing. The process method for melting and forming the equal-wall-thickness variable-diameter fuel spray rod in the selective laser area has the advantages that the processing procedures of the equal-wall-thickness variable-diameter fuel spray rod are greatly reduced, the turnover time is greatly shortened, a cutter and a clamp are not needed, the manufacturing period and the cost are saved, and the technical problems of large welding deformation of the fuel spray rod, long repair cycle of a heat shield, large assembly residual stress, repeated correction and the like are solved.
Description
Technical Field
The invention relates to the technical field of additive manufacturing, in particular to a process method for a selective laser melting and forming equal-wall-thickness variable-diameter fuel spray rod.
Background
The selective laser melting and forming technology has the characteristics of high forming precision, good size conformance and the like, and is particularly suitable for the development and small-batch trial production of small and medium-sized complex structural parts. In recent years, with the continuous improvement of the selective laser melting forming process, the equipment stability and the quality reliability, the product verification stage is gradually entered. At present, a selective laser melting technology becomes a new popular technology for meeting the technical bottleneck in the aerospace field, and the selective laser melting technology has many applications in the aerospace field and has stable and reliable performance.
The fuel spray rod of the aircraft engine is of an equal-wall-thickness reducing lengthened pipe and multi-nozzle structure, and is large in number of welding lines and high in size precision. When the traditional process is adopted, the welding deformation seriously affects the size precision, so that the integral consistency is poor after the fuel spray rod is combined and welded. When the nozzle base and the oil nozzle are assembled with the heat shield, the theoretical positions of the nozzle base and the oil nozzle deviate, holes in the heat shield need to be repaired one by one, the repairing amount is large, and the assembly period is long. The existing fuel spray rod has the problems of large welding deformation, long repair cycle of a heat shield, large assembly residual stress, repeated correction and the like, and the manufacturing cycle and the cost of parts are high. In addition, in order to further satisfy the user demand of aeroengine part, the fuel spray lance structure improves comprehensively again, changes three-way pipe connector into three-dimensional special-shaped nozzle seat to spray lance diameter changes gradually change structure, becomes the wall thickness reducing fuel spray lance that equals, and this makes traditional technology manufacturing fuel spray lance be difficult to realize in the technology.
Disclosure of Invention
In order to solve the technical problems of large welding deformation, long repair cycle of a heat shield, large assembly residual stress, repeated correction and the like of the fuel spray rod in the prior art, the invention provides a process method for melting and forming the fuel spray rod with the variable diameter and the equal wall thickness in a laser selection area, which greatly reduces the processing procedures of the fuel spray rod with the variable diameter and the equal wall thickness, greatly shortens the turnover time, does not need a cutter or a clamp, and saves the manufacturing period and the cost.
In order to realize the purpose, the technical scheme of the invention is as follows:
a process method for forming an equal-wall-thickness variable-diameter fuel spray rod through selective laser melting comprises the following steps:
s1, establishing a three-dimensional model of the constant-wall-thickness variable-diameter fuel spray rod;
s2, determining the forming direction of the variable-diameter fuel spray rod with the equal wall thickness:
the forming direction of the constant-wall-thickness variable-diameter fuel spray rod is the direction along the movement of the scraper, and the included angle between the rod part of the spray rod and the substrate is 45 degrees;
s3, adding support:
adding a first solid support at the position of the oil nozzle;
adding a second solid support and a grid support at the bottom of the nozzle base;
s4, setting the parameters of the selective laser melting forming process, which specifically comprises the following steps:
the diameter of a light spot is 80-100 mu m, the laser power is 200-240W, the scanning speed is 900-1050mm/s, the thickness of the powder layer is 30-40 mu m, the compensation value of the light spot is 0.05mm, the phase angle is 67 degrees, the lap joint quantity is 0.05 mu m, and the scanning strategy is snaking;
s5, under the condition of inert gas, melting and forming in a laser selection area of the equal-wall-thickness reducing fuel spray rod;
s6, post-processing:
removing residual powder;
carrying out heat treatment on the substrate and the supported constant-wall-thickness variable-diameter fuel spray rod;
and separating the base plate from the variable-diameter fuel spray rod with the same wall thickness, and removing the support.
Furthermore, the solid support I comprises two inclined parts and a plurality of upright post parts, the two inclined parts are positioned at two sides of the oil spray nozzle and are arranged along the shape of the rod part of the spray rod, and the inclined parts are connected with the end part of the oil spray nozzle; the upright post parts are vertically arranged between the base plate and the inclined parts below the spray rod parts.
Further, the inclined part of the first solid support is of a cuboid structure, and the length, the width and the height of the inclined part are 3mm, 3mm and 280 mm; the cross section of the upright post part of the first solid support is a square with the side length of 3 mm.
Furthermore, the second solid support is arranged at the edge of the nozzle base, and the grid support is arranged in the middle of the nozzle base.
Further, the parameters of the grid support include:
filling line parameters: the X axis is filled with 0.60mm, the Y axis is filled with 0.60mm, and the rotation angle is 45 degrees;
filling tooth parameters: the height of the upper teeth is 0.80mm, the length of the top is 0.15mm, the length of the base is 0.50mm, the interval between the bases is 0.10mm, and the upper teeth and the lower teeth are synchronous;
cutting parameters: x is 6.00mm apart, Y is 6.00mm apart, and the width of the separation is 0.60 mm.
Further, in step S6, the compressed air and the vibration platform are used to clean the powder on the surface of the substrate, the supported fuel spray lance with the variable diameter and the equal wall thickness, and the powder inside the cavity.
Further, in step S6, a vacuum heat treatment furnace is used to perform heat treatment on the substrate and the supported fuel spray boom with a variable diameter and an equal wall thickness.
Further, in the step S6, the substrate and the variable-diameter fuel spray rod with the same wall thickness are cut by a linear cutting method, and the first solid support, the second solid support and the grid support are polished to remove the first solid support, the second solid support and the grid support, so as to obtain the variable-diameter fuel spray rod with the same wall thickness.
The invention has the beneficial effects that:
1) the invention carries out process improvement on the fuel spray rod with the variable diameter and the equal wall thickness, realizes the manufacturing, the integrated design and the forming of the fuel spray rod with the variable diameter and the equal wall thickness, can reduce 13 parts such as the spray rod, the nozzle seat and the like into 1 part, reduces the welding number of the parts to 0, greatly improves the manufacturing precision and the conformity of the fuel spray rod, reduces the number of welding seams and eliminates the welding deformation;
2) the manufacturing precision and the quality consistency of the constant-wall-thickness variable-diameter fuel spray rod are greatly improved, and the problems of long repair cycle, large assembly residual stress, repeated correction and the like of a heat shield in the traditional process are solved;
3) the uniform-wall-thickness reducing fuel spray rod formed by melting in the selective laser area has the advantages that the integral performance of parts is greatly improved, the tensile strength of a GH625 alloy matrix can reach 1100MPa after the selective laser area is melted and formed, the mechanical property index is close to the level of a forge piece/bar, the strength of a welding seam in the original welding process is less than 800MPa, the requirement of the uniform-wall-thickness reducing fuel spray rod on the strength is greatly improved, the metallographic structure is observed, the internal structure of the uniform-wall-thickness reducing fuel spray rod formed by melting in the selective laser area is well controlled, and the defects of incomplete fusion, cracks and the like are overcome.
Additional features and advantages of the invention will be set forth in part in the detailed description which follows.
Drawings
FIG. 1 is a schematic structural view of a constant wall thickness variable diameter fuel spray bar according to the present invention;
FIG. 2 is a schematic diagram of a top view of a variable diameter fuel spray bar of the present invention;
FIG. 3 is a schematic side view of a variable diameter fuel spray bar of the present invention;
FIG. 4 is a sectional view A-A of FIG. 3;
FIG. 5 is a schematic view of the forming direction of the constant wall thickness variable diameter fuel spray rod and the addition of a first solid support and a second solid support provided by the invention;
FIG. 6 is a schematic view of an equal wall thickness variable diameter fuel spray bar provided by the present invention with the addition of a second solid support and a grid support;
FIG. 7 is a schematic illustration of fill line parameters for a grid support provided by the present invention;
FIG. 8 is a schematic illustration of fill tooth parameters for a grid support provided by the present invention;
FIG. 9 is a schematic illustration of the cutting parameters of the grid support provided by the present invention;
FIG. 10 is a schematic structural diagram of a typical spot compensation test provided by the present invention, wherein 10-1 is a front view; 10-2 is a cross-sectional view; 10-3 is a top view.
Reference numerals in the drawings of the specification include:
1-nozzle seat, 2-spray rod part, 3-oil spray nozzle, 4-solid support I, 5-solid support II, 6-grid support and 7-typical part.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In order to solve the problems in the prior art, as shown in fig. 1 to 10, the invention provides a process method for melting and forming an equal-wall-thickness variable-diameter fuel spray rod in a laser selected area, wherein the equal-wall-thickness variable-diameter fuel spray rod comprises a nozzle seat 1, a spray rod part 2 and a fuel spray nozzle 3, and the process method for melting and forming the equal-wall-thickness variable-diameter fuel spray rod in the laser selected area comprises the following steps:
s1, establishing a three-dimensional model of the constant-wall-thickness variable-diameter fuel spray rod, and establishing the three-dimensional model of the constant-wall-thickness variable-diameter fuel spray rod by adopting UG (Unigraphics), wherein as shown in figures 1-4, the length of a spray rod part 2 of the constant-wall-thickness variable-diameter fuel spray rod is 330mm, the wall thickness is 1mm, two joints in different directions are arranged at the top of a nozzle connecting seat 1, the bottom of the nozzle connecting seat 1 is connected with two spray rod parts 2, and each spray rod part 2 is provided with 14 symmetrical fuel spray nozzles 3.
S2, determining the forming direction of the variable-diameter fuel spray rod with the equal wall thickness:
the forming direction of the constant-wall-thickness variable-diameter fuel spray rod is along the moving direction of the scraper, and the included angle between the rod part 2 of the spray rod and the base plate is 45 degrees.
As shown in figure 5, in order to reduce the addition of the support, the fuel spray rod with the same wall thickness and the variable diameter is arranged at an angle of 45 degrees with the horizontal direction, and the forming direction of the part is selected as the moving direction of the scraper, so that the conditions of cutter clamping, warping and the like in the forming process, which are opposite to the moving direction of the scraper, are prevented.
S3, adding support:
as shown in fig. 5, a solid support 4 is added at the position of the oil nozzle 3 by using UG software, the solid support 4 comprises two inclined parts and a plurality of upright parts, the two inclined parts are located at two sides of the oil nozzle 3 and are configured with the rod part 2, and the inclined parts are connected with the end of the oil nozzle 3; the plurality of upright column parts are vertically arranged between the base plate and the inclined parts below the spray rod parts 2. In the embodiment, in order to ensure that the whole variable-diameter fuel spray rod with the equal wall thickness does not deform, solid supports, namely a solid support-4 inclined part, are added on two sides of the fuel spray nozzle 3 along with the 2-shaped spray rod part, wherein the inclined part of the solid support-4 is of a cuboid structure, and the length, the width and the height of the inclined part are 3mm, 3mm and 280 mm; 6 solid supports with the cross section of 3mm multiplied by 3mm, namely 6 upright post parts are added on the lower surface of the inclined part which is positioned below the spray rod part 2 and forms an angle of 45 degrees with the horizontal plane, and the upright post part of the solid support I4 is a square with the side length of 3 mm.
As shown in fig. 6 to 9, a second solid support 5 is added to the bottom of the nozzle base 1 by UG software, and the second solid support 5 is disposed at the edge of the nozzle base 1 to ensure smooth formation of the position of the nozzle base 1; after the three-dimensional model of the equal-wall-thickness reducing fuel spray rod added with the solid support is repaired by using Magics software, an additional grid support 6 is added at the bottom of the nozzle base 1, the grid support 6 is arranged in the middle of the nozzle base 1, and the parameters of the grid support 6 comprise:
filling line parameters: x-axis fill (a)0.60mm, Y-axis fill (b)0.60mm, rotation angle (c)45 °;
filling tooth parameters: the height (d) of the upper teeth is 0.80mm, the length (e) of the top is 0.15mm, the length (f) of the base is 0.50mm, the interval (g) of the base is 0.10mm, and the upper teeth and the lower teeth are synchronous;
cutting parameters: x is 6.00mm apart (h), Y is 6.00mm apart (i), and the width of separation (j) is 0.60 mm.
According to the invention, the three-dimensional models of the variable-diameter fuel spray rod with the equal wall thickness are placed according to the forming direction requirement, and solid support and grid support are added. The solid support I4 is added at the position of the rod part 2 of the spray rod along with the shape so as to ensure that the whole variable-diameter fuel spray rod with the same wall thickness is not deformed, and the solid support I4 is only locally connected with the fuel spray nozzle 3 so as to facilitate the removal of subsequent support. And a second solid support 5 is added at the bottom of the nozzle base 1, and a grid support 6 is added at the bottom of the nozzle base 1 at a position where the included angle between the edge of the part and the horizontal direction is less than or equal to 45 degrees, so as to ensure the smooth forming of the position of the nozzle base 1.
S4, setting the parameters of the selective laser melting forming process, which specifically comprises the following steps:
the diameter of a light spot is 80-100 mu m, the laser power is 200-240W, the scanning speed is 900-1050mm/s, the thickness of a powder layer is 30-40 mu m, the compensation value of the light spot is 0.05mm, the phase angle is 67 degrees, the lap joint quantity is 0.05 mu m, and the scanning strategy is snaking.
In the invention, the wall thickness of the variable-diameter fuel spray rod with the same wall thickness is required to be 1 +/-0.05 mm, spot compensation is carried out for controlling the precision of the spray rod to be 1 +/-0.05 mm, and the optimal spot compensation value is 0.05 mm. As shown in fig. 10, the spot compensation value is obtained through a spot compensation test, spot compensation with different values is designed by intercepting the typical part 7, the typical test part is melted and formed through selective laser, and finally, the optimal spot compensation value is determined so as to control the accuracy of the spray rod to be 1 +/-0.05 mm.
S5, under the condition of inert gas, melting and forming in a laser selection area of the equal-wall-thickness reducing fuel spray rod;
in the invention, GH625 powder is subjected to selective laser melting forming under the condition of inert gas such as argon, and the supported fuel spray rod with the variable diameter and the equal wall thickness is obtained by scanning the powder by laser and forming layer by layer in an accumulation manner.
S6, post-processing:
and removing residual powder, and cleaning the powder on the surface of the substrate, the supported equal-wall-thickness variable-diameter fuel spray rod and the powder inside the cavity by adopting compressed air and a vibration platform. In the embodiment, after the forming is finished and the part is cooled for 4 hours, the forming cabin door is opened to take out the base plate and the part, the base plate and the powder on the surface of the constant-wall-thickness variable-diameter fuel spray rod with the support are cleaned by adopting compressed air, and the floating powder on the surface is removed; and (3) carrying out mechanical vibration on the substrate and the equal-wall-thickness variable-diameter fuel spray rod with the support by adopting a vibration platform to remove residual powder in the cavity of the equal-wall-thickness variable-diameter fuel spray rod. The parameters of the vibration platform are as follows: the power is 0.50kW, the vibration frequency is 50Hz, and the vibration time is 10 min.
The base plate and the supported equal-wall-thickness reducing fuel spray rod are subjected to heat treatment by a vacuum heat treatment furnace, in the embodiment, the base plate and the supported equal-wall-thickness reducing fuel spray rod are subjected to heat treatment by a vacuum high-pressure gas quenching furnace, the heat treatment system is 1100 +/-10 ℃, the temperature is kept for 1.5 hours, and the base plate and the supported equal-wall-thickness reducing fuel spray rod are cooled by filling argon.
Separating the base plate from the variable-diameter fuel spray rod with the same wall thickness, removing the supports, cutting the base plate and the variable-diameter fuel spray rod with the same wall thickness by adopting a linear cutting method, and polishing to remove the first solid support 4, the second solid support 5 and the grid support 6 to obtain the variable-diameter fuel spray rod with the same wall thickness. In this embodiment, after the heat treatment, the equal-wall-thickness variable-diameter fuel spray rod with the support is taken down from the substrate by using linear cutting, and the first solid support 4, the second solid support 5 and the grid support 6 of the part are removed by using tools such as pliers, an electric grinder and the like, so that the equal-wall-thickness variable-diameter fuel spray rod is obtained.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (4)
1. A process method for forming an equal-wall-thickness variable-diameter fuel spray rod through selective laser melting is characterized in that the process method for forming the equal-wall-thickness variable-diameter fuel spray rod through selective laser melting comprises the following steps:
s1, establishing a three-dimensional model of the constant-wall-thickness variable-diameter fuel spray rod;
s2, determining the forming direction of the variable-diameter fuel spray rod with the equal wall thickness:
the forming direction of the constant-wall-thickness variable-diameter fuel spray rod is the direction along the movement of the scraper, and the included angle between the rod part of the spray rod and the substrate is 45 degrees;
s3, adding support:
adding a first solid support at the position of the oil nozzle; the solid support I comprises two inclined parts and a plurality of upright post parts, the two inclined parts are positioned at two sides of the oil nozzle and are arranged along the shape of the rod part of the spray rod, and the inclined parts are connected with the end part of the oil nozzle; the plurality of upright post parts are vertically arranged between the base plate and the inclined parts below the rod parts of the spray rod;
adding a second solid support and a grid support at the bottom of the nozzle base, wherein the second solid support is arranged at the edge of the nozzle base, and the grid support is arranged in the middle of the nozzle base;
s4, setting the parameters of the selective laser melting forming process, which specifically comprises the following steps:
the diameter of a light spot is 80-100 mu m, the laser power is 200-240W, the scanning speed is 900-1050mm/s, the thickness of the powder layer is 30-40 mu m, the compensation value of the light spot is 0.05mm, the phase angle is 67 degrees, the lap joint quantity is 0.05 mu m, and the scanning strategy is snaking;
s5, under the condition of inert gas, melting and forming in a laser selection area of the equal-wall-thickness reducing fuel spray rod;
s6, post-processing:
removing residual powder;
carrying out heat treatment on the substrate and the supported fuel spray rod with the equal wall thickness and the variable diameter;
separating the substrate from the variable-diameter fuel spray rod with the same wall thickness, and removing the support;
adopt vacuum heat treatment furnace to carry out heat treatment to base plate and the wall thickness reducing fuel spray lance that has the support that waits, specifically do: carrying out heat treatment on the base plate and the supported constant-wall-thickness variable-diameter fuel spray rod by using a vacuum high-pressure gas quenching furnace, wherein the heat treatment system is 1100 +/-10 ℃, keeping the temperature for 1.5h, and filling argon for cooling;
and cutting the base plate and the constant-wall-thickness variable-diameter fuel spray rod by adopting a linear cutting method, and polishing to remove the first solid support, the second solid support and the grid support to obtain the constant-wall-thickness variable-diameter fuel spray rod.
2. The process method for melting and forming the fuel spray rod with the variable diameter and the equal wall thickness in the selected laser area as claimed in claim 1, wherein the inclined part of the first solid support is of a cuboid structure, and the length, the width and the height of the inclined part are 3mm, 3mm and 280 mm; the cross section of the upright post part of the first solid support is a square with the side length of 3 mm.
3. The process method for selective laser melting forming of the fuel spray rod with the variable wall thickness and the variable diameter as claimed in claim 1, wherein the parameters of the grid support comprise:
filling line parameters: the X axis is filled with 0.60mm, the Y axis is filled with 0.60mm, and the rotation angle is 45 degrees;
filling tooth parameters: the height of the upper teeth is 0.80mm, the length of the top is 0.15mm, the length of the base is 0.50mm, the interval between the bases is 0.10mm, and the upper teeth and the lower teeth are synchronous;
cutting parameters: x is 6.00mm apart, Y is 6.00mm apart, and the width of the separation is 0.60 mm.
4. The process method for selective laser melting forming of the fuel spray rod with the variable diameter and the equal wall thickness as claimed in claim 1, wherein in the step S6, compressed air and a vibration platform are used for cleaning powder on the surface of the base plate and the fuel spray rod with the variable diameter and the equal wall thickness and the inside of the cavity.
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| CN115475958A (en) * | 2022-09-02 | 2022-12-16 | 中国航发北京航空材料研究院 | Flame tube manufacturing method based on laser powder bed melting additive manufacturing technology |
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