CN116493705A - Arc additive path planning method without lap joint in swing forming layer of actuating mechanism - Google Patents
Arc additive path planning method without lap joint in swing forming layer of actuating mechanism Download PDFInfo
- Publication number
- CN116493705A CN116493705A CN202310553893.1A CN202310553893A CN116493705A CN 116493705 A CN116493705 A CN 116493705A CN 202310553893 A CN202310553893 A CN 202310553893A CN 116493705 A CN116493705 A CN 116493705A
- Authority
- CN
- China
- Prior art keywords
- swing
- omega
- arc
- maximum amplitude
- forming
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000654 additive Substances 0.000 title claims abstract description 33
- 230000000996 additive effect Effects 0.000 title claims abstract description 33
- 230000007246 mechanism Effects 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000007704 transition Effects 0.000 claims abstract description 40
- 229910000861 Mg alloy Inorganic materials 0.000 claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 claims abstract description 25
- 239000002184 metal Substances 0.000 claims abstract description 25
- 239000002131 composite material Substances 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 230000010355 oscillation Effects 0.000 claims description 15
- 238000003754 machining Methods 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 5
- 230000008033 biological extinction Effects 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 7
- 238000010791 quenching Methods 0.000 description 12
- 230000000171 quenching effect Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 9
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007514 turning Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/095—Monitoring or automatic control of welding parameters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Abstract
The invention provides a method for planning an arc additive path without lap joint in an actuating mechanism swing forming layer, which is characterized in that a traditional magnesium alloy cold metal transition swing filling path is segmented again, a path planning mode and swing parameters of an arc starting section and an arc extinguishing section are corrected, and a composite swing filling mode is adopted for forming, so that the forming defect caused by large magnesium alloy splashing rate under a complex path caused by traditional cold metal transition swing path planning and the forming size shrinkage problem of the arc starting section and the arc extinguishing section are solved, the adaptability of the cold metal transition actuating mechanism swing forming path planning mode in the magnesium alloy complex structure path planning is improved, and the forming quality and stability are improved.
Description
Technical Field
The invention relates to the technical field of additive manufacturing, in particular to an arc additive path planning method without lap joint in an actuating mechanism swing forming layer.
Background
The arc additive manufacturing technology (Wire and Arc Additive Manufacture, WAAM) uses an arc as a heat source, and builds up layers by a machine tool, a mechanical arm or other executing mechanisms, and a dense metal component is built up by a line-surface-body path.
Arc additive manufacturing techniques generally involve two types of path planning methods for additive path planning for a section of a large thick-walled component and a component that includes large wall thickness features, one path planning method based on scan filling and the other path planning method based on contour filling. The former generally deposits the section outline first, then the part in the outline is scanned and filled completely; the latter typically performs a similar profile scan of different proportions for each shape profile within a layer, depending on the single pass weld width. When the path planning method is adopted to form a large thick-wall structure, a plurality of overlapping or executing mechanism swinging modes are generally adopted to fill the cross section shape, wherein the swinging filling mode can greatly reduce overlapping between inner channels, starting points and receiving points, and improve the internal quality of a formed part.
Patent application number 201710250370.4 discloses a method for manufacturing a large-wall-thickness aluminum alloy structural member by increasing the single-pass deposition forming width in a swinging manner of an actuating mechanism, and the arc additive of the aluminum alloy structural member with the wall thickness of 20mm can be realized under a certain swinging parameter. However, the overlapping track still needs to be used after the wall thickness is more than 20mm, and the problems of unstable forming quality and the like during multiple overlapping cannot be avoided.
Patent application number 202010208816.9 discloses a method for planning an arc additive manufacturing path without lap joint in a layer, which adds machining allowance to an arc additive manufacturing structural member to simplify the shape of a layered section into a more regular shape with allowance, extracts linear feature combinations on the layered section on the basis, further forms a linear path, and finally completes the planning of the additive path in the section by means of swinging filling. The method greatly reduces the arc additive manufacturing program statement and the number of arcing and arc receiving points, eliminates inter-track overlap joint, but does not solve the problems of forming collapse and size shrinkage of complex structure path planning.
The arc additive manufacturing for magnesium alloy cold metal transition swing forming has 4 common problems: (1) the single swing period consists of 1 forward swing and 1 backward swing, the parameters of the single swing period are completely consistent and cannot be independently adjusted, the complex path planning adaptability is poor, and the forming collapse is easy to occur; (2) the same swing parameter is adopted, amplitude convergence exists near an arcing point and an arc extinguishing point, and the forming size of the arcing section and the arc extinguishing section is far smaller than a preset size under the influence of various factors such as molten pool fluidity and acceleration of an actuating mechanism; (3) the inner side and the outer side of the linear-to-arc line-to-linear-or-broken line-section path are different in filling density, and filling defects are easy to form; (4) the non-linear path has an overlapping area, the overlapping rate is large, and the surface evenness is poor, so that a large amount of splashing is easy to form.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an arc additive path planning method without lap joint in an actuating mechanism swing forming layer.
The invention provides a method for planning an arc additive path without lap joint in an actuating mechanism swing forming layer, which comprises the following steps:
step 1: optimizing a forming part model: adding machining allowance to the magnesium alloy cold metal transition arc additive manufacturing forming part, filling holes and adding transition fillets to enable the sectional shape of the magnesium alloy cold metal transition arc additive manufacturing forming part after layering slicing to be a more regular shape with allowance;
step 2: extracting the cross-sectional shape: slicing the arc additive manufacturing model in layers to obtain sectional shape data of each layer of the structural member;
step 3: extracting a linear path: extracting the central line from the part with the central line in the direction of any section linear path, extracting the central line from the rest part after filling, and simplifying the part into a single-path swinging filling forming linear path or a multi-section linear path meeting the section shape;
step 4: the linear path is segmented again: dividing the linear path into an arc starting section Aa, an arc extinguishing section bB and a middle section ab again according to the arc starting point A and the arc extinguishing point B, wherein the arc starting section Aa is divided into N sections of linear paths, and the arc extinguishing section bB is divided into N sections of linear paths;
step 5: adding composite swing filling: and selecting a swinging mode for each section of paths of the arcing section Aa, the middle section ab and the arc extinguishing section bB according to the section characteristics, and setting corresponding swinging parameters and path parameters.
Preferably, in the step 4, in the conventional swing path planning, the length range of the arcing segment Aa is 3-25mm, the amplitude of the point a is not 0, and the maximum amplitudes after arcing are ω respectively 1 、ω 2 、ω 3 ，ω 1 Is (0.4-0.6) omega, omega 2 Is (0.8-1.2) omega, omega 3 The maximum amplitude of the rest sections of the arc starting is omega, the rest sections of the arc starting are segmented again and then are divided into N sections of linear paths, N is more than or equal to 3, the length range of the bB of the arc extinguishing section is 3-20mm, the amplitude of the b point is not 0, and the maximum amplitude before the arc extinguishing is omega respectively 4 、ω 5 、ω 6 ，ω 4 Is (0.8-1) omega, omega 5 Is (0.5-0.8) omega, omega 6 For (0.2-0.5) omega, the maximum amplitude of the rest sections of the arc quenching is omega, the rest sections of the arc quenching are segmented again and then are divided into n sections of linear paths, n is more than or equal to 2, the initial swing width D is equal to or greater than the initial swing width D, and the maximum amplitude omega=0.5D in a stable state. The amplitude of the point a and the point b after correction is 0, aa 1 Maximum amplitude of segment omega 1 ' is (0.7-1) omega, a 1 a 2 Maximum amplitude of segment omega 2 ' is (1.1-1.5) omega, a 2 a 3 Maximum amplitude of segment omega 3 ' is (1-1.2) omega, the maximum amplitude range (1-1.1) omega of the rest of the arc is started and gradually converges until a N Maximum amplitude of A segment omega n ' =ω, corrected bb n Maximum amplitude of segment omega 4 ’＝ω，b 2 b 1 Maximum amplitude of segment omega 5 ' is (0.7-1) omega, b 1 Maximum amplitude omega of segment B 6 ' is (0.5-0.8) omega, and the maximum amplitude of the rest segment of the arc extinguishing is kept unchanged;
preferably, in the step 5, the compound oscillation filling means the forward and backward oscillation forms, the oscillation times and the oscillation length L in a single oscillation period Positive direction /L Reverse-rotation Swing width D Positive direction /D Reverse-rotation Edge dead time T Positive direction /T Reverse-rotation And a central dead time T In (a) Can be independently arranged.
For arc additive swing forming path planning with the included angle of broken line segments being theta, when theta being more than or equal to 30 degrees and less than or equal to 120 degrees, an initial swing mode adopts Z-shaped or sine swing, the outer side of a corner adopts circular swing or sine swing, the inner side adopts Z-shaped swing, and the maximum amplitude interval of two periods on the inner side of the corner and the maximum amplitude interval of two periods on the outer side are basically equal by adjusting the dead time, swing width, swing length, swing times and swing width and swing length of the outer side of the corner, so that the forming height consistency of the inner side and the outer side is met, the corner is formed in a smooth transition mode, and the forming size is more than or equal to the preset size; when theta is more than or equal to 120 degrees and less than or equal to 180 degrees, the initial swinging mode adopts Z-shaped or sine swinging, the swinging mode is not changed between the outer side and the inner side of the corner, and the maximum amplitude interval between two periods on the inner side of the corner and the maximum amplitude interval between two periods on the outer side are basically equal by adjusting the dead time, the swinging width, the swinging length and the swinging width and the swinging length of the inner side of the corner, so that the consistency of forming heights of the inner side and the outer side is met, the forming size is more than or equal to the preset size in a smooth transition forming mode at the corner;
for arc path with the straight line radius of R or arc material-increasing swing forming path planning with the arc line, when R is less than or equal to 5mm, the arc material-increasing swing forming path is equal to a broken line path with the included angle theta=90 degrees; when R is more than or equal to 5mm, the initial swing mode adopts Z-shaped or sine swing, the outer side of the arc corner adopts circular swing or sine swing, the inner side adopts Z-shaped or sine swing, and the maximum amplitude interval of two periods on the inner side of the arc and the maximum amplitude interval of two periods on the outer side are basically equal by adjusting the dead time, swing width, swing length, swing times and swing width and swing length of the inner side, so that the forming height consistency of the inner side and the outer side is met, the corner is formed in a smooth transition mode, and the forming size is more than or equal to the preset size.
Compared with the prior art, the invention has the following beneficial effects:
(1) The magnesium alloy cold metal transition swing forming path is divided into an arc starting section, a middle section and an arc quenching section, and the path technological parameters and swing parameters of the arc starting section and the arc quenching section are respectively corrected under the condition that the initial setting swing width is not changed, so that the dimensional shrinkage problem of the arc starting section and the arc quenching section can be improved;
(2) The composite swinging filling form is adopted to replace the traditional swinging filling form of cold metal transition, a folding line segment path, a straight line to arc or an arc to straight line path are optimized, the splashing rate is effectively reduced, the adaptability of a swinging forming path planning mode of a cold metal transition executing mechanism in a magnesium alloy complex structure is improved, and the forming quality and stability are improved.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a typical magnesium alloy cold metal transition actuator swing forming straight line segment path;
fig. 2 is a schematic diagram of a path formed by swinging the arc striking section Aa and the arc extinguishing section bB executing mechanism after correction;
FIG. 3 is a schematic diagram of a typical magnesium alloy cold metal transition actuator swing forming fold segment path;
FIG. 4 is a schematic diagram of a modified exemplary actuator swing forming fold segment path;
FIG. 5 is a schematic diagram of a typical magnesium alloy cold metal transition actuator swing forming straight line to arc path;
FIG. 6 is a schematic diagram of a modified exemplary actuator swing-formed straight-line arc path.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
The invention mainly uses the mode of optimizing the model of the formed part, extracting the section shape, extracting the linear path, segmenting the linear path again and adding the compound swing filling, and is technically characterized in that the forming defect caused by larger splashing rate of the magnesium alloy under the complex path caused by the traditional swing path planning of the cold metal transition and the size shrinkage problem of the arcing section and the quenching section are solved by segmenting the magnesium alloy cold metal transition swing filling path again, correcting the path planning mode and swing parameters of the arcing section and the quenching section and adopting the compound swing filling mode for forming, and the concrete implementation steps are as follows:
step 1: optimizing a forming part model: adding machining allowance to the magnesium alloy cold metal transition arc additive manufacturing forming part, filling holes and adding transition fillets to enable the sectional shape of the magnesium alloy cold metal transition arc additive manufacturing forming part after layering slicing to be a more regular shape with allowance;
step 2: extracting the cross-sectional shape: slicing the arc additive manufacturing model in layers to obtain sectional shape data of each layer of the structural member;
step 3: extracting a linear path: extracting the central line from the part with the central line in the direction of any section linear path, extracting the central line from the rest part after filling, and simplifying the part into a single-path swinging filling forming linear path or a multi-section linear path meeting the section shape;
step 4: the linear path is segmented again: dividing the linear path into an arc starting section Aa, an arc extinguishing section bB and a middle section ab again according to the arc starting point A and the arc extinguishing point B, wherein the arc starting section Aa is divided into N sections of linear paths, and the arc extinguishing section bB is divided into N sections of linear paths;
step 5: adding composite swing filling: and selecting a swinging mode for each section of paths of the arcing section Aa, the middle section ab and the arc extinguishing section bB according to the section characteristics, and setting corresponding swinging parameters and path parameters.
In the step 1, the magnesium alloy model optimizes the radius range of the transition fillet to be 0.5-5mm, and reduces the design of machining allowance as small as possible under the condition of not affecting the forming stability;
in the step 4, the length range of the arcing section Aa in the conventional swing path planning is 3-25mm, the point a amplitude is not 0, and the maximum amplitude after arcing is omega respectively 1 、ω 2 、ω 3 ，ω 1 Is (0.4-0.6) omega, omega 2 Is (0.8-1.2) omega, omega 3 Is (1-1.1) omega, and the arc is startedThe maximum amplitude of the rest sections is omega, the rest sections are segmented again and then are divided into N sections of linear paths, N is more than or equal to 3, the length range of the arc quenching section bB is 3-20mm, the amplitude of the point b is not 0, and the maximum amplitude before quenching is omega respectively 4 、ω 5 、ω 6 ，ω 4 Is (0.8-1) omega, omega 5 Is (0.5-0.8) omega, omega 6 For (0.2-0.5) omega, the maximum amplitude of the rest sections of the arc quenching is omega, the rest sections of the arc quenching are segmented again and then are divided into n sections of linear paths, n is more than or equal to 2, the initial swing width D is equal to or greater than the initial swing width D, and the maximum amplitude omega=0.5D in a stable state. The amplitude of the point a and the point b after correction is 0, aa 1 Maximum amplitude of segment omega 1 ' is (0.7-1) omega, a 1 a 2 Maximum amplitude of segment omega 2 ' is (1.1-1.5) omega, a 2 a 3 Maximum amplitude of segment omega 3 ' is (1-1.2) omega, the maximum amplitude range (1-1.1) omega of the rest of the arc is started and gradually converges until a N Maximum amplitude of A segment omega n ' =ω, corrected bb n Maximum amplitude of segment omega 4 ’＝ω，b 2 b 1 Maximum amplitude of segment omega 5 ' is (0.7-1) omega, b 1 Maximum amplitude omega of segment B 6 ' is (0.5-0.8) omega, and the maximum amplitude of the rest segment of the arc extinguishing is kept unchanged;
in the step 5, the compound oscillation filling refers to the forward and backward oscillation forms, the oscillation times and the oscillation length L in a single oscillation period Positive direction /L Reverse-rotation Swing width D Positive direction /D Reverse-rotation Edge dead time T Positive direction /T Reverse-rotation And a central dead time T In (a) Can be independently arranged.
For arc additive swing forming path planning with the included angle of broken line segments being theta, when theta being more than or equal to 30 degrees and less than or equal to 120 degrees, an initial swing mode adopts Z-shaped or sine swing, the outer side of a corner adopts circular swing or sine swing, the inner side adopts Z-shaped swing, and the maximum amplitude interval of two periods on the inner side of the corner and the maximum amplitude interval of two periods on the outer side are basically equal by adjusting the dead time, swing width, swing length, swing times and swing width and swing length of the outer side of the corner, so that the forming height consistency of the inner side and the outer side is met, the corner is formed in a smooth transition mode, and the forming size is more than or equal to the preset size; when theta is more than or equal to 120 degrees and less than or equal to 180 degrees, the initial swinging mode adopts Z-shaped or sine swinging, the swinging mode is not changed between the outer side and the inner side of the corner, and the maximum amplitude interval between two periods on the inner side of the corner and the maximum amplitude interval between two periods on the outer side are basically equal by adjusting the dead time, the swinging width, the swinging length and the swinging width and the swinging length of the inner side of the corner, so that the consistency of forming heights of the inner side and the outer side is met, the forming size is more than or equal to the preset size in a smooth transition forming mode at the corner;
for arc path with the straight line radius of R or arc material-increasing swing forming path planning with the arc line, when R is less than or equal to 5mm, the arc material-increasing swing forming path is equal to a broken line path with the included angle theta=90 degrees; when R is more than or equal to 5mm, the initial swing mode adopts Z-shaped or sine swing, the outer side of the arc corner adopts circular swing or sine swing, the inner side adopts Z-shaped or sine swing, and the maximum amplitude interval of two periods on the inner side of the arc and the maximum amplitude interval of two periods on the outer side are basically equal by adjusting the dead time, swing width, swing length, swing times and swing width and swing length of the inner side, so that the forming height consistency of the inner side and the outer side is met, the corner is formed in a smooth transition mode, and the forming size is more than or equal to the preset size.
Example 1: magnesium alloy thick straight wall structure cold metal transition arc additive swing forming path planning with length of 100mm
As shown in FIG. 1, the initial swing mode is set to be Z-shaped swing, the swing width is 20mm, namely, the maximum amplitude omega=10mm in the stable state, the swing length is 5mm, the length of an arcing section Aa is 11mm, the arc-starting section Aa is 4-section linear paths, the amplitude of a point a is 0, the length of a quenching section bB is 9mm, the arc-starting section bB is divided into 3-section linear paths, and the amplitude of b point b is 0, omega 1 ～ω 6 To correct the amplitude of each segment before. As shown in FIG. 2, the corrected Aa 1 The length of the segment is 2.5mm, the maximum amplitude is 8mm, a 1 a 2 The length of the segment is 2.5mm, the maximum amplitude is 14mm, a 2 a 3 The length of the segment is 3mm, the maximum amplitude is 12mm, a 2 a 3 The length of the segment is 3mm, the maximum amplitude omega 3 ' =10mm, corrected bb 3 The length of the segment is 2.5mm, the maximum amplitude is 10mm, b 3 b 2 The length of the segment is 2.5mm, the maximum amplitude is 10mm, b 2 b 1 The length of the segment is2mm, maximum amplitude of 9mm, b 1 The length of the section B is 2mm, and the maximum amplitude is 6mm. The length of the middle section ab is 80mm, and the initial setting of the swing parameters is not required to be adjusted.
Example 2: magnesium alloy cold metal transition arc additive swing forming path planning with included angle theta of broken line segment
As shown in FIG. 3, a schematic diagram of a typical swing forming fold line segment path of an actuator is shown, wherein when θ is more than or equal to 30 degrees and less than or equal to 120 degrees, the preset swing length and frequency are adjusted, so that no defect is formed at a corner point, the path overlap rate is more than or equal to 25%, the splashing rate is larger, the forming surface is uneven, and the forming size is less than or equal to the preset size. Setting an initial swing mode to be Z-shaped swing, wherein the swing width is 15mm, the outer side of a corner is changed to be arc-shaped swing, the swing width is increased to 20mm, the number of times of outside swing is increased to 2 times, the dead time of the outer side is increased to 0.1s, the inner side is still in Z-shaped swing, the swing width is reduced to 10mm, a path schematic diagram is shown in fig. 4, the overlapping rate of inflection points can be effectively reduced, meanwhile, the forming height consistency of the inner side and the outer side is better, the forming surface is relatively smooth, the forming height consistency of the inner side and the outer side is met, the corner is formed in a smooth transition mode, and the forming size is more than or equal to a preset size;
when 180 degrees or more and theta is equal to or more than 120 degrees, the initial swing mode is set to be Z-shaped swing, the swing width is 15mm, the outer side of the corner is in sine swing, the swing width is increased to 19mm, the dead time of the outer side is added for 0.2s, the inner side is in Z-shaped swing, the swing width is reduced to 11mm, the consistency of forming heights of the inner side and the outer side is met, the corner is formed in a smooth transition mode, and the forming size is equal to or more than a preset size.
Example 3: arc path magnesium alloy cold metal transition arc additive swing forming path planning with linear radius R
When R is less than or equal to 5mm, the arc path with the straight line turning radius R can refer to a broken line path with an included angle of 90 degrees, when R is more than or equal to 5mm, the conventional swing path planning of an actuating mechanism is generally shown as shown in fig. 5 by adjusting preset swing length and frequency, the arc additive swing forming path planning with the typical straight line turning radius R has different filling density degrees on the inner side and the outer side, the inner side Gao Duyuan is higher than the outer side, when the height difference is more than or equal to 2mm, a large amount of splashes on the inner side can possibly cause wire blocking and hole defects, and filling collapse is easily formed on the outer side. The initial swing mode is set to be Z-shaped swing, the swing width is 15mm, the outer side of a corner is changed to be arc-shaped swing, the swing width is increased to 20mm, the number of times of outer side swing is increased to 2 times, the dead time of the outer side is increased to 0.1s, the inner side is changed to be Z-shaped swing, the swing width is reduced to 10mm, the path schematic diagram is shown in fig. 6, the maximum amplitude interval of two periods on the inner side of the arc is basically equal to the maximum amplitude interval of two periods on the outer side, the forming height consistency of the inner side and the outer side is met, the corner is formed in a smooth transition mode, and the forming size is larger than or equal to the preset size.
Compared with the traditional path planning method for swinging filling of the magnesium alloy cold metal transition actuating mechanism, the path planning method for swinging filling of the magnesium alloy cold metal transition actuating mechanism has the advantages that the path planning mode and swinging parameters of the arc starting section and the arc extinguishing section are segmented again and corrected, and the composite swinging filling mode is adopted for forming, so that the forming defect caused by large magnesium alloy splashing rate and the size shrinkage problem of the arc starting section and the arc extinguishing section under the complex path caused by the traditional swinging path planning of cold metal transition are solved, the adaptability of the swinging forming path planning mode of the cold metal transition actuating mechanism in the complex structure of the magnesium alloy is improved, and the forming quality and stability are improved.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (1)
1. The arc additive path planning method without lap joint in the swing forming layer of the actuating mechanism is characterized by comprising the following steps of:
step 1: optimizing a forming part model: adding machining allowance to a magnesium alloy forming part manufactured by cold metal transition arc additive, filling holes and adding transition fillets, so that the sectional shape of the magnesium alloy forming part after layering slicing is a more regular shape with allowance;
step 2: extracting the cross-sectional shape: slicing the arc additive manufacturing model in layers to obtain sectional shape data of each layer of the structural member;
step 3: extracting a linear path: extracting the central line from the part with the central line in the direction of any section linear path, extracting the central line from the rest part after filling, and simplifying the part into a single-path swinging filling forming linear path or a multi-section linear path meeting the section shape;
step 4: the linear path is segmented again: dividing the linear path into an arc starting section Aa, an arc extinguishing section bB and a middle section ab again according to the arc starting point A and the arc extinguishing point B, wherein the arc starting section Aa is divided into N sections of linear paths, and the arc extinguishing section bB is divided into N sections of linear paths;
step 5: adding composite swing filling: selecting a swinging mode of each section of paths of the arcing section Aa, the middle section ab and the arc extinction section bB according to the section characteristics, and setting corresponding swinging parameters and path parameters;
in the step 1, the magnesium alloy model optimizes the radius range of the transition fillet to be 0.5-5mm, and reduces the design of machining allowance as small as possible under the condition of not affecting the forming stability;
in the step 4, the length range of the arcing section Aa in the conventional swing path planning is 3-25mm, the point a amplitude is not 0, and the maximum amplitude after arcing is omega respectively 1 、ω 2 、ω 3 ，ω 1 Is (0.4-0.6) omega, omega 2 Is (0.8-1.2) omega, omega 3 The maximum amplitude of the rest sections of the arc starting is omega, the rest sections of the arc starting are segmented again and then are divided into N sections of linear paths, N is more than or equal to 3, the length range of the bB of the arc extinguishing section is 3-20mm, the amplitude of the b point is not 0, and the maximum amplitude before the arc extinguishing is omega respectively 4 、ω 5 、ω 6 ，ω 4 Is (0.8-1) omega, omega 5 Is (0.5-0.8) omega, omega 6 The maximum amplitude of the rest sections of the arc extinguishing is omega, the rest sections of the arc extinguishing are segmented again and then are divided into n sections of linear paths, n is more than or equal to 2, the initial swing width D is equal to the initial swing width D, and the maximum amplitude omega=0.5D in a stable state;
corrected a, b point amplitudeIs 0, aa 1 Maximum amplitude of segment omega 1 ' is (0.7-1) omega, a 1 a 2 Maximum amplitude of segment omega 2 ' is (1.1-1.5) omega, a 2 a 3 Maximum amplitude of segment omega 3 ' is (1-1.2) omega, the maximum amplitude range (1-1.1) omega of the rest of the arc is started and gradually converges until a N Maximum amplitude of A segment omega n ' =ω, corrected bb n Maximum amplitude of segment omega 4 ’＝ω，b 2 b 1 Maximum amplitude of segment omega 5 ' is (0.7-1) omega, b 1 Maximum amplitude omega of segment B 6 ' is (0.5-0.8) omega, and the maximum amplitude of the rest segment of the arc extinguishing is kept unchanged;
in the step 5, the compound oscillation filling refers to the forward and backward oscillation forms, the oscillation times and the oscillation length L in a single oscillation period Positive direction /L Reverse-rotation Swing width D Positive direction /D Reverse-rotation Edge dead time T Positive direction /T Reverse-rotation And a central dead time T In (a) Can be independently arranged and can not be identical;
for arc additive swing forming path planning with the included angle of broken line segments being theta, when theta being more than or equal to 30 degrees and less than or equal to 120 degrees, an initial swing mode adopts Z-shaped or sine swing, the outer side of a corner adopts circular swing or sine swing, the inner side adopts Z-shaped swing, and the maximum amplitude interval of two periods on the inner side of the corner is equal to the maximum amplitude interval of two periods on the outer side by adjusting the dead time, swing width, swing length, swing times of the outer side and swing width and swing length of the inner side, so that the forming height consistency of the inner side and the outer side is met, the corner is formed in a smooth transition mode, and the forming size is more than or equal to the preset size; when theta is more than or equal to 120 degrees and less than or equal to 180 degrees, the initial swinging mode adopts Z-shaped or sine swinging, the swinging mode is not changed between the outer side and the inner side of the corner, and the maximum amplitude interval between two periods on the inner side of the corner and the maximum amplitude interval between two periods on the outer side are equal by adjusting the dead time, the swinging width, the swinging length and the swinging width and the swinging length of the inner side of the corner, so that the forming height consistency of the inner side and the outer side is met, the forming size is more than or equal to the preset size;
for arc path with the straight line radius of R or arc material-increasing swing forming path planning with the arc line, when R is less than or equal to 5mm, the arc material-increasing swing forming path is equal to a broken line path with the included angle theta=90 degrees; when R is more than or equal to 5mm, the initial swing mode adopts Z-shaped or sine swing, the outer side of the arc corner adopts circular swing or sine swing, the inner side adopts Z-shaped or sine swing, and the maximum amplitude interval of two periods on the inner side of the arc and the maximum amplitude interval of two periods on the outer side are equal by adjusting the dead time, swing width, swing length, swing times and swing width and swing length of the inner side, so that the forming height consistency of the inner side and the outer side is met, the corner is formed in a smooth transition mode, and the forming size is more than or equal to the preset size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310553893.1A CN116493705A (en) | 2023-05-16 | 2023-05-16 | Arc additive path planning method without lap joint in swing forming layer of actuating mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310553893.1A CN116493705A (en) | 2023-05-16 | 2023-05-16 | Arc additive path planning method without lap joint in swing forming layer of actuating mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116493705A true CN116493705A (en) | 2023-07-28 |
Family
ID=87321514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310553893.1A Pending CN116493705A (en) | 2023-05-16 | 2023-05-16 | Arc additive path planning method without lap joint in swing forming layer of actuating mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116493705A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117892036A (en) * | 2024-01-15 | 2024-04-16 | 南京衍构科技有限公司 | Method, system and storage medium for calculating flatness of additive surface |
-
2023
- 2023-05-16 CN CN202310553893.1A patent/CN116493705A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117892036A (en) * | 2024-01-15 | 2024-04-16 | 南京衍构科技有限公司 | Method, system and storage medium for calculating flatness of additive surface |
| CN117892036B (en) * | 2024-01-15 | 2024-10-01 | 南京衍构科技有限公司 | Method, system and storage medium for calculating flatness of additive surface |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11267050B2 (en) | Method for forming horizontal overhanging structure without vertical support in selective laser melting | |
| CN116493705A (en) | Arc additive path planning method without lap joint in swing forming layer of actuating mechanism | |
| CN110899905B (en) | Correction method for polygonal member sharp angle path based on arc additive manufacturing | |
| WO2021057050A1 (en) | Bilateral ultrasonic rolling processing track coordination method for blade surface | |
| CN110802337A (en) | Method for sealing and welding end face of annular copper-steel brazing part with sandwich structure | |
| CN113478833B (en) | 3D printing forming method based on skeleton line contour recognition and region segmentation | |
| JP2010131616A (en) | Tandem rock welding method | |
| CN114103126B (en) | 3D printing scanning filling path planning method for revolving body with unequal wall thickness | |
| CN102615395B (en) | Method for welding single-arc double-wire pipelines | |
| CN112276088A (en) | Light path control method for 3D printing laser uniform scanning | |
| CN114393296B (en) | Power control method for laser repeated combination track | |
| CA3060285C (en) | Shaping method for three-dimensional shaped product | |
| CN102658415A (en) | Single-arc twin-wire pipeline welding method | |
| Shen et al. | A path generation method for wire and arc additive remanufacturing of complex hot forging dies | |
| CN110614368A (en) | Method for improving density of 3D printed part through laser processing hardening treatment | |
| CN115647391A (en) | Contour scanning path planning method based on material increase and decrease composite printing | |
| JP6487530B2 (en) | Method for building a gas turbine engine component | |
| CN114473137A (en) | Electric arc additive manufacturing method for anisotropic topological optimization structural part | |
| CN110126266A (en) | A kind of three-dimension object manufacturing method | |
| CN106735725A (en) | Adapter pump case dissimilar metal all-position welding method | |
| CN114749784A (en) | Method for improving surface quality of electron beam fuse forming part | |
| CN110387816A (en) | Band has one's mind filled with the Orthotropic Steel Bridge Deck structure and its assembly method of formula internal partition | |
| CN115555680A (en) | Aluminum-magnesium alloy hull bow plug welding plate assembling and welding process and assembling and welding structure | |
| CN111644729A (en) | Additive manufacturing and forming method for arc fuse | |
| JP2008264841A (en) | Welding method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |