A method for generating manufacturing arc gate vane part drawing by digital model lofting

Abstract

This invention discloses a method for generating manufacturing drawings of arc-shaped door leaf components using digital model lofting, belonging to the field of hydraulic metal structure manufacturing technology. It utilizes Autodesk Inventor software for 3D modeling and lofting to obtain engineering drawings; generates component drawings in AutoCAD format through format conversion; and imports the edited part drawings into a CNC cutting machine for automatic cutting and blanking. The steps are as follows: A1. Create the central partition beam; A2. Create the side partition beam: modify the central partition beam file to obtain the side partition beam file; A3. Create the side beam: modify the central partition beam file to obtain the side beam file; A4. Create the door leaf assembly; A5. Create the 3D model engineering drawings and AutoCAD drawings; A6. Edit the graphics using AutoCAD software. This invention uses digitally driven software to facilitate graphic modification, reducing the workload of drawing; utilizes AutoCAD software to simplify graphic editing, reducing the programming process for blanking; provides more accurate dimensions and shapes, eliminating the need for corrections when assembling components, thus improving manufacturing quality and efficiency.

Description

Technical Field

[0001] This invention relates to the field of hydraulic metal structure manufacturing technology, and in particular to a method for generating manufacturing drawings of arc gate leaf components by digital model lofting. Background Technology

[0002] Arc-shaped gates typically employ a main beam frame structure, welded together from components such as the main beam, top beam, bottom beam, horizontal secondary beams, side beams, partition beams, and arc-shaped panels. Due to the electrothermal release effect of the molten welding rods and the thermal expansion and contraction deformation of the weld beads during the welding process, the radius of curvature and lateral dimensions of the arc-shaped gate leaf shrink after welding. To ensure that the manufactured dimensions and shape match the design, the dimensions and shapes of each component need to be enlarged before manufacturing; this is the so-called arc-shaped gate layout process.

[0003] The welding shrinkage of the door leaf is an empirical value, closely related to the plate thickness, welding method, and welding process; the manufacturing unit determines it based on its experience. For manual arc welding, the shrinkage is generally taken as 1.5 / 1000 of the weld length, while for gas shielded welding, it is taken as 2 / 3000 of the weld length. The side beams, partition beams, and panel sides of the curved door leaf are arc-shaped, and after welding, they will shrink along the arc direction. After welding, the top and bottom ends of the door leaf will warp up by a distance Δ≈(0.4 / 1000-0.5 / 1000)L, where L represents the arc length of the panel, thus reducing the radius of curvature of the curved door. The layout process before manufacturing involves enlarging the designed radius of curvature R of the curved door to R′ for component cutting and fabrication.

[0004] Existing methods for laying out the radius of curvature of an arc gate include: site enlargement method and radius of curvature formula calculation method.

[0005] 1. Site scale-up method.

[0006] First, determine the center point O on the layout platform, and draw the designed arc length AA′ of the gate leaf. Draw a straight line through the midpoint M and center point O of the arc; connect the center point with the two ends AO and A′O of the arc. The angle 2α between these two lines is the central angle corresponding to the arc length of the gate leaf. Then, extend the welded deformation Δ of the gate leaf outward along the radii of AO and A′O respectively to obtain points B and B′. Use the method of three points B, M, and B′ being concyclic to find point O′, which is the layout center point of the gate leaf; BO′, MO′, and B′O′ are the layout radius R′ of the gate leaf. Measure the chord length C and vector height h of the arc BB′, and the layout radius R′ can be directly calculated.

[0007]

[0008] Lay down felt, thin sheet metal, or polyester drawing template on the layout platform. Redraw the arc with the door leaf layout radius R′ and draw the inner arc of the door leaf panel. According to the design arc length plus the welding shrinkage, draw the angle position of the bottom beam, main cross beam, horizontal secondary beam, and top beam respectively. Add the welding shrinkage to the height of the main cross beam (the welding shrinkage can be omitted when the top beam, bottom beam, and horizontal secondary beam are steel sections). Then draw the outline of the web of the side beam and partition beam. Cut the laid down polyester drawing template, etc., to obtain the layout template of the web of the side beam and partition beam. Then you can use the template to draw the material on the steel plate.

[0009] 2. Calculation method using the radius of curvature formula.

[0010] Based on the formation mechanism of welding deformation of curved gate leaves, previous researchers have summarized the formula for laying out the radius of curvature through engineering practice:

[0011]

[0012] In the formula: R′--door leaf layout radius; R--arc door design radius; Δ--door leaf deformation after welding Δ≈(0.4 / 1000-0.5 / 1000)L, L--design arc length at the top and bottom of the panel; 2α--central angle corresponding to the design arc length at the top and bottom of the panel.

[0013] Substituting the design value of the door leaf into the above formula, the radius for the door leaf layout can be calculated. CAD software is used for layout. The inner and outer arcs of the door leaf panel are drawn using the layout radius R′. The welding shrinkage is set according to the plate thickness and welding method, and added to the design arc length (or angle) of the corresponding horizontal beam. The angular positions of the bottom beam, main crossbeam, horizontal secondary beam, and top beam are drawn respectively. The height of the main crossbeam also needs to include the welding shrinkage (no welding shrinkage is added when the top beam, bottom beam, and horizontal secondary beam are made of structural steel). After determining the position of the horizontal beam system, the shape and dimensions of the web and rear flange of the side beams and partition beams are drawn respectively. This yields the plan view of the side beams, partition beam webs, and other components. The blanks are then cut and shaped on the steel plate. The plates are then assembled and welded into components, and the beam body and door leaf panel are assembled and welded together on an arc-shaped platform.

[0014] As can be seen from the above, in the existing manufacturing technology of curved door leaf, the site enlargement method is to make a template from the site sample, cut the material, and then assemble and weld the sheet material into parts. The beam body and door leaf panel are then assembled and welded on the curved platform. The curvature radius formula calculation method is to first calculate the door leaf layout radius, use CAD software to lay out the material, obtain the part drawing, cut the sheet material, assemble and weld it into parts, and then assemble and weld the beam body and door leaf panel on the curved platform.

[0015] Creating templates from enlarged site samples lacks precision, and using these templates for material cutting leads to accumulated process errors. This method is only suitable for low-grade arched gate production and cannot guarantee the quality of high-grade arched gates. CAD software lacks numerical control; it requires inputting values ​​and specifying locations to generate line segments or graphics, followed by dimensioning. Incorrect lengths, positions, or shapes necessitate further modifications. The horizontal beams of arched gates are positioned by angle or arc length, making the layout process cumbersome, time-consuming, inefficient, and prone to errors. The resulting floor plans cannot be reused, requiring multiple deletions and redrawings for modifications. With the rapid development of electronic technology, introducing advanced digital technologies into traditional manufacturing is essential for high-quality manufacturing and green development. Summary of the Invention

[0016] To address the shortcomings of existing methods, this invention proposes a method for generating manufacturing drawings of arc-shaped door leaf components using digital model lofting.

[0017] A method for generating manufacturing part drawings of curved door leaf components from digital model lofting involves 3D modeling and lofting using Autodesk Inventor software to obtain engineering drawings; generating part drawings in AutoCAD format through format conversion; and importing the part drawings into a CNC cutting machine for automatic cutting and blanking after editing.

[0018] The steps are as follows:

[0019] A1. Create the central partition beam;

[0020] A2. Create the side beam: Modify the middle beam file to obtain the side beam file;

[0021] A3. Create the edge beam: Modify the center beam file to obtain the edge beam file;

[0022] A4. Create door leaf assembly;

[0023] A5. Create engineering drawings and AutoCAD drawings of the 3D model;

[0024] A6. AutoCAD software for editing graphics: When cutting materials for CNC cutting machines, it adds secondary welding shrinkage and machining allowance to the width and length dimensions, and modifies the size and shape of the graphics; it arranges materials reasonably according to the steel plate specifications, and inputs the information into the CNC cutting machine control system to cut out the shape of the parts.

[0025] Preferably, step A1 includes the following steps:

[0026] S1. Use Autodesk Inventor software to create a two-dimensional sketch of the cross-section of the diaphragm beam in the door leaf;

[0027] S2. Create the central beam model: After completing the sketch, "extrude" to obtain the three-dimensional model.

[0028] Preferred:

[0029] Step A2 includes the following steps:

[0030] Save the central diaphragm model as a side diaphragm file in ".ipt format"; modify different dimensions and shapes on the sketch using the "Edit Sketch" command, and modify different dimensions generated by extrusion using the "Edit Feature" command; after modifying the shape and size of the central diaphragm web flange, it becomes a side diaphragm;

[0031] Step A3 includes the following steps:

[0032] Save the central beam model as a side beam file in ".ipt format"; modify the different dimensions and shapes on the sketch using the "Edit Sketch" command, and modify the different dimensions generated by extrusion using the "Edit Feature" command; after modification, it becomes a side beam.

[0033] Preferably, in step A4, the door leaf assembly model is created in the software component environment interface; including the following steps:

[0034] T1. Import the edge beam from the assembly drawing; select the "Weldment.iam" template to create a new sheet metal part and enter the welding part environment interface; under the "Assembly" section, click the "Place" button, select the edge beam to import, and fix it in the assembly coordinate system;

[0035] T2, side partition beams, and center partition beams are imported into the assembly drawing; under the "Assembly" section, click the "Place" button, select the side partition beams and center partition beams, import them into the corresponding positions in the assembly drawing, and fix them;

[0036] T3. Create the bottom beam and top beam parts;

[0037] T4. Create the horizontal secondary beam component;

[0038] T5. Create the front flange of the side beam;

[0039] T6. Create a panel bottom edge reinforcement plate;

[0040] T7. Create the upper main crossbeam part;

[0041] T8. Create the lower main crossbeam component;

[0042] T9. Check whether there is any interference between the horizontal beam system and the vertical beam system of the door leaf;

[0043] T10, Door Leaf Panel Creation.

[0044] Preferably, step T7 includes the following steps:

[0045] T701, Create the main crossbeam part;

[0046] T702, Edit the main crossbeam parts;

[0047] a. Cutting at the end of the main crossbeam:

[0048] b. Creation of the diagonal flange of the main crossbeam;

[0049] c. Create connection holes for the rear flange of the main crossbeam.

[0050] Preferably, step A5 includes the following steps:

[0051] V1. Create the door leaf assembly engineering drawing;

[0052] V2. Create AutoCAD drawings of the door leaf assembly.

[0053] Preferably, step V1 includes the following steps:

[0054] V101. Importing the Door Leaf Assembly Model into the Engineering Drawing: Create an engineering drawing and select the door leaf assembly model to import it.

[0055] V102, Create the left view of the door leaf;

[0056] V103. Create a sectional view of the diaphragm beam in the door leaf;

[0057] V104, Edit and annotate graphics;

[0058] The “Dimension” command marks the angles between the upper and lower main beams, the angles between the top beam and the horizontal secondary beam, and the angles between the bottom beam and the lower main beam, and generates the center lines of the main beam sections and the horizontal secondary beam sections.

[0059] V105, Insert Parts List, Export Part Numbers: Name the "Export BOM" as Parts List, and save the door leaf assembly drawing and door leaf assembly model in the same folder.

[0060] Compared with the prior art, the present invention provides a method for generating manufacturing arc door leaf component drawings by digital model lofting, which has the following beneficial effects.

[0061] 1. This invention utilizes digital driving software to facilitate graphic modification. Similar structures can be transformed into new parts with slight modifications, reducing the workload of drawing. The use of AutoCAD software simplifies graphic editing, reducing material cutting and programming processes. The dimensions and shapes are more precise, and components can be used directly without correction when assembling parts, improving production quality and efficiency.

[0062] 2. This invention can directly print out paper drawings to guide the production process; it reduces unnecessary adjustments and corrections during the assembly process, thereby reducing the workload and labor intensity of the assembly process; it can export three-dimensional PDF files for all-round observation and use for technical briefings before manufacturing, making it easier for workers to understand the spatial three-dimensional structure of the arc gate leaf and reducing unnecessary errors during the manufacturing process.

[0063] 3. This invention utilizes the software's "detection" function to guide the dimensional measurement and inspection during the verification and assembly process, making quality control easier to achieve and ensure, and improving the manufacturing quality and inspection level of the door leaf.

[0064] 4. This invention uses 3D modeling, engineering drawings, and AutoCAD graphics of the arc-shaped door leaf to guide the cutting of parts, as well as the alignment, inspection, and measurement during the manufacturing of parts and the assembly of the door leaf. It provides direct technical guidance and theoretical reference for the manufacturing process, facilitates the operation of each process, and makes it easier to achieve manufacturing quality control. It has innovative and practical significance.

[0065] Other advantages, objectives and features of the invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be learned from practice of the invention. Attached Figure Description

[0066] Figure 1 This is a two-dimensional sketch of the central partition beam.

[0067] Figure 2 This is a 3D model of the central partition beam component.

[0068] Figure 3 This is a 3D model of the side partition beam component.

[0069] Figure 4 This is a 3D model of the edge beam component.

[0070] Figure 5 Editing for the top beam components.

[0071] Figure 6 Assemble the curved door leaf (plane).

[0072] Figure 7 This is a 3D model of the main crossbeam component.

[0073] Figure 8 Assemble the arched door leaf (3D).

[0074] Figure 9 This is an assembly drawing for the door leaf. Detailed Implementation

[0075] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0076] Reference Figure 1-9 A method for generating manufacturing arc door leaf component drawings from digital model lofting involves using Autodesk Inventor software for 3D modeling and lofting to obtain engineering drawings; generating component drawings in AutoCAD format through format conversion; and importing the component drawings into a CNC cutting machine for automatic cutting and blanking after editing.

[0077] The steps are as follows:

[0078] A1. Create the central partition beam;

[0079] A2. Create the side beam: Modify the middle beam file to obtain the side beam file;

[0080] A3. Create the edge beam: Modify the center beam file to obtain the edge beam file;

[0081] A4. Create door leaf assembly;

[0082] A5. Create engineering drawings and AutoCAD drawings of the 3D model;

[0083] A6. AutoCAD software for editing graphics: When cutting materials for CNC cutting machines, it adds secondary welding shrinkage and machining allowance to the width and length dimensions, and modifies the size and shape of the graphics; it arranges materials reasonably according to the steel plate specifications, and inputs the information into the CNC cutting machine control system to cut out the shape of the parts.

[0084] To create the central diaphragm, follow these steps.

[0085] S1. Use Autodesk Inventor software to create a two-dimensional sketch of the cross-section of the diaphragm beam in the door leaf; such as Figure 1 As shown.

[0086] S101. Unit precision settings: Open Autodesk Inventor software, create a new first file "SheetMetal.ipt" to enter the sheet metal part creation environment, click "Document Settings" under the "Tools" menu, and adjust the linear dimension precision to 0.001mm and the angle precision to 0.00001° or higher.

[0087] S102. Draw the center line of the main crossbeam and the rear flange:

[0088] In the sheet metal parts environment, in the "3D Model" section of the secondary menu bar, click the "Start Creating 2D Sketch" command; create a new sketch on the xy plane and draw the sectional view of the partition beam in the door leaf design drawing; draw the center line of the lower main crossbeam section with the arc door loft radius R', and position the right end at the original coordinate point, with the position constraint being horizontal; draw the rectangular section of the rear flange of the main crossbeam perpendicular to the center line of the lower main crossbeam, and mark the dimension to the left end of the center line = panel thickness + main beam design height + 0.1% shrinkage; then draw the center line of the upper main crossbeam with the original coordinate point and length R', and the angle is the arc length between the two main crossbeams + the corresponding value of 0.1% shrinkage; draw the rectangular section of the rear flange of the upper main crossbeam, constrained perpendicularly to the center line, and the distance from the left end of the center line is equal to the design value plus 1 / 1000 shrinkage.

[0089] According to Clause 7.5.1 of the current standard "Code for Manufacturing, Installation and Acceptance of Steel Gates for Water Conservancy and Hydropower Projects" (GB / T14173-2008), the center distance between the two main beams should be ±3mm, and the gate leaf layout must be 1-2mm larger than the standard value. If the measured center distance between the upper and lower main beams is less than this value, the welding shrinkage allowance should be increased. Continue welding only after the requirement is met to avoid rework.

[0090] S103, Draw the panel curve:

[0091] Click the "Arc" drop-down menu in the "Sketch" section of the menu bar, select the "Center Arc" button, and draw the outer edge arc of the door panel with the original coordinate point as the center and R′ as the radius. The angle from the lower end of the arc to the center line of the lower main beam is equal to the angle value corresponding to "design arc length + shrinkage + 20mm". The angle from the upper end of the arc to the center line of the upper main beam is equal to the angle value corresponding to "design arc length + shrinkage + 20mm". Offset the outer edge arc of the panel inward by one panel thickness to obtain the inner edge arc.

[0092] S104. Draw the cross section of the main beam:

[0093] The main crossbeam has an I-shaped cross-section. Click the "Sketch" panel in the menu bar, select the "Rectangle" drop-down menu, and choose the "Three-Point Rectangle" command to draw an arbitrary rectangle. Label the design dimensions of the front flange cross-section. Constrain the long side to be perpendicular and symmetrical to the center lines of the upper and lower main crossbeams, and constrain the long side of the adjacent panel to be "tangent" to the inner arc line. The front flange cross-section is now complete. Similarly, draw the main beam web cross-section rectangle, with the short sides "collinear" with the front and lower flanges, and constrained symmetrically with the center lines of the upper and lower main crossbeams.

[0094] S105. Draw the cross-sections of the bottom beam, top beam, and horizontal secondary beam:

[0095] The bottom beam and top beam are generally made of standard channel steel. Click the "Insert" button on the "Sketch" panel in the menu bar, select the CAD block of the same specification channel steel section, and insert it near the bottom beam. Add position and size constraints to the CAD block, with the opening facing upwards, the back line constrained to "coincide" with the original coordinate point, the front limb angle constrained to "tangent" with the inner arc line, and the angle between the front limb angle and the center line of the lower main crossbeam equal to the angle corresponding to the design arc length plus one-thousandth of the shrinkage amount.

[0096] Repeat the process to create the top beam channel steel section.

[0097] The horizontal secondary beam is generally a standard I-beam; insert a CAD block of the same specification I-beam section, add shape, position and size constraints, constrain the centerline of the web of the I-beam to coincide with the original coordinate point, constrain the two ends of the straight line of the front limb angle to coincide with the inner arc line, and make the angle with the centerline of the main beam section equal to the design arc length plus the shrinkage amount; the horizontal secondary beam section is created.

[0098] S106. Draw the outline of the web of the central diaphragm beam:

[0099] The upper and lower main crossbeams divide the central partition beam into three parts: the upper partition beam, the middle partition beam, and the bottom partition beam. When the door leaf size is relatively high, it is also necessary to manufacture it in sections for easy transportation. Based on transportation restrictions and structural characteristics, the sectioning position of the web of the central partition beam is first determined, and two webs are made at the top and bottom of the section joint; therefore, the central partition beam is divided into two sections: the upper central partition beam and the lower central partition beam.

[0100] Drawing the web outline of the bottom diaphragm beam:

[0101] Draw between the lower main crossbeam and the bottom beam. Draw chamfers at the welds of the web and flange of the lower main crossbeam section, and at the right angles of the front flange. Draw chamfers at the rounded corners of the bottom beam. Draw a straight line connecting the upper end of the bottom beam (channel steel) leg corner to the lower end of the rear flange of the lower main crossbeam. Make the outline of the bottom partition beam web form a closed region. The drawing of the bottom partition beam web section is now complete.

[0102] Drawing of the flange of the bottom diaphragm:

[0103] Offset the rear straight edge of the bottom diaphragm web plate outward by one design plate thickness to obtain the straight line behind the wing plate. Connect the two ends of the straight line to form the rectangular section of the rear wing plate. When the angle between the short side and the bottom beam is less than 50°, reserve a gap, constrain the shape, mark the dimensions and angles, and the bottom diaphragm wing plate is completed.

[0104] Repeat the process to draw the web and flanges of the upper and lower sections of the upper and middle partition beams respectively; after completing the sketch, save it as the middle partition beam part.

[0105] S02: Create the central diaphragm model.

[0106] After completing the sketch, the operation interface will automatically return to the "3D Model" module environment. Click the "Extrude" command in the menu bar, and select the web profile surfaces of the bottom partition beam, the lower section of the middle partition beam, the upper section of the middle longitudinal beam, and the upper partition beam to symmetrically extrude to the design plate thickness to obtain the 3D model of the corresponding web. Click the "Extrude" command in the menu bar again, and select the flange sections of the bottom partition beam, the lower section of the middle partition beam, the upper section of the middle partition beam, and the upper partition beam to symmetrically extrude to the design plate width to obtain the 3D model of the corresponding flange.

[0107] After the central diaphragm model is created, as follows: Figure 2 As shown.

[0108] Creating edge beams involves the following steps.

[0109] Click the "File" drop-down menu in the interface menu bar and save the central diaphragm beam model as a side diaphragm beam file in ".ipt format". The side diaphragm beam refers to the side sectional view of the connection between the main crossbeam and the support arm of the door leaf, parallel to the plane containing the central diaphragm beam and the side beam. The door leaf panel, bottom beam, horizontal secondary beam, and top beam have identical sections; the differences lie in the width and thickness of the rear flange of the main crossbeam, the thickness of the web of the side diaphragm beam, and the length, width, and thickness of the flange of the side diaphragm beam. Different dimensions and shapes on the sketch can be modified using the "Edit Sketch" command, and different dimensions generated by the extrusion command can be modified using the "Edit Feature" command.

[0110] In the "3D Model" section of the menu bar, double-click the sketch in the "Model" browser window to enter the sketch editing interface. Modify the width and thickness of the rear flange of the main crossbeam to match the design values, and the shape of the rear flange will automatically change. The length of the side beam flange will also change accordingly. If you do not want to change it, delete the original constraints and add new constraints at the corresponding positions of the rear flange of the main crossbeam, and the length of the side beam flange will automatically update.

[0111] The same procedure can be followed to modify the thickness of the side beam flange, etc.

[0112] In the "3D Model" section of the menu bar, left-click the corresponding extrusion command in the "Model" browser window, right-click and select "Edit Feature". The "Extrusion Command Dialog Box" will pop up automatically. Modify the web thickness and flange width to the design values, and then click "OK" to complete the automatic update.

[0113] After the shape and dimensions of the web flange of the central diaphragm beam are modified, it becomes a side diaphragm beam.

[0114] After the side beam model is created, as follows Figure 3 As shown.

[0115] Creating an edge beam involves the following steps.

[0116] Click the "File" drop-down menu in the menu bar of the operation interface, and save the central beam model as a side beam file in ".ipt format".

[0117] The side beam design drawing is a side view or lateral sectional view of the arched door leaf, parallel to the plane containing the central diaphragm beam and side partition beam. The side beam cross-section is an asymmetrical I-shape, therefore the radius of the side beam web needs to be reduced by the thickness of the front flange. The lengths of the bottom beam and top beam are flush with the outer side of the side beam's rear flange, and the lengths of the front flanges of the main crossbeam and horizontal secondary beams connect to the side of the side beam's front flange; the lengths of the main crossbeam web, the web of the horizontal secondary beam, and the rear flange extend to the inner side of the side beam web. Therefore, there is no corresponding notch on the side beam web, and the rear flange of the main crossbeam connects to the side of the side beam's rear flange—this is the main difference of the side beam.

[0118] The modification method for the central diaphragm component model is basically the same as that for the side diaphragm. Different dimensions and shapes on the sketch are modified using the "Edit Sketch" command, and different dimensions generated during the extrusion process are modified using the "Edit Feature" command. After modification, it can be transformed into the side diaphragm component model. Figure 4 ).

[0119] It should be noted that the front flange of the side beam is arc-shaped along its length and does not need to be assembled with the side beam for ease of manufacturing; it is assembled together with the panel when assembling the door leaf.

[0120] Create a door leaf assembly model.

[0121] The central partition beam, side partition beam, and side beam mentioned above are all created in the Autodesk Inventor software part environment interface, while the door leaf assembly model will be created in the software component environment interface.

[0122] Door leaf assembly is the process of assembling the door leaf. The pre-made central partition beam, side partition beam, and side beam parts are imported into the assembly drawing for simulated assembly. Based on the position of the assembled state, the component drawings of the bottom beam, main cross beam, horizontal secondary beam, top beam, etc. are then drawn. The correct assembly position is the most critical process that determines the manufacturing precision of the door leaf and directly affects the manufacturing quality of the door leaf and its components.

[0123] It includes the following steps.

[0124] T1, edge beam is imported into the assembly drawing.

[0125] After completing the edge beam part model, in the Autodesk Inventor software part environment interface, click the first-level menu "New File" and select the "Weldment.iam" template to create a new sheet metal part, and enter the welding part environment interface; then click the "Placement" button under the "Assembly" section of the second-level menu bar, select the edge beam created above and import it; click the "Constraint" button, select the constraint type as "Surface Alignment", and align the original coordinate system "YZ, XZ, XY" planes of the assembly section with the original coordinate system planes of the edge beam one by one; the edge beam is fixed in the assembly coordinate system.

[0126] T2, side partition beams, and center partition beams are imported into the assembly drawing.

[0127] Click the "Place" button under the "Assembly" section in the secondary menu bar, select the side beam created above, click the "Constraint" button, select "Surface Alignment" as the constraint type, and align the original coordinate system "YZ, XZ" plane of the assembly section with the YZ, XZ coordinate system of the side beam. The XY plane of the side beam coordinate system should be offset from the original coordinate system XY plane of the assembly environment by a welding shrinkage amount of "design spacing + 0.1%". Click the "OK" button in the dialog box to end the command, and the position of the side beam will be fixed.

[0128] Repeat the process to move the central partition beam into the corresponding position on the assembly drawing and fix it in place.

[0129] T3. Create the bottom beam and top beam parts.

[0130] T301, Create symmetrical components for edge beams, edge partition beams, and center partition beams.

[0131] In the "Assembly" section menu bar, select the "Plane" drop-down menu, select the "Offset from Plane" button, select the original XY plane of the assembly coordinate system, and offset it to the side of the central beam by "1 / 2 + 1 / 1000 of the welding shrinkage of the edge beam center distance", and name it "Longitudinal Center Plane"; the longitudinal center plane of the door leaf is now created.

[0132] On the "Assembly" menu bar, click the "Mirror" command. In the pop-up "Mirror Components" dialog box, select the side beam, side partition beam, and center partition beam as objects. Then click the "Mirror Plane" button, select the longitudinal center plane of the door leaf, click "Next", and click "OK" after accepting the default system options.

[0133] To facilitate observation, the symmetrical components of the side beams and center beams are made "invisible" and hidden.

[0134] T302, Create the bottom beam and top beam parts.

[0135] Click the "Create Component" command on the "Assembly" menu bar, name it "Bottom Beam", and save it in the same folder; select the longitudinal center plane as the reference plane to create a new sketch, make the sketch of the central beam visible, project the outline of the bottom beam channel steel section, and complete the sketch.

[0136] The operation interface automatically returns to the "3D Model" section of the part environment. Click the "Extrude" command in the menu bar, select the profile of the bottom beam channel steel section to extrude, select the outer side of the rear flange of the left and right side beams in the "Range" and click "OK". The bottom beam part is now created. Right-click in the drawing area and select "Complete Editing". The operation interface automatically returns to the assembly section of the welding component environment.

[0137] Repeat the above steps to create the top beam part.

[0138] T303, Edit the top beam parts.

[0139] The inner side of the front flange of the side beam is connected to the front corner of the top beam (channel steel); therefore, the end of the top beam needs to be edited to create a corresponding notch to avoid interference with the front flange of the side beam during assembly.

[0140] Open the top beam part saved in the folder; the software will automatically enter the part environment interface. In the "3D Model" section of the secondary menu bar, click the "Create 2D Sketch" command. Select the back of the top beam channel steel as the sketch plane, project the end lines, and use the side corner limb lines of the panel as construction lines. Draw a rectangle for each end, with the long side of the rectangle parallel to the corner limb projection line, and dimension it equal to the thickness of the front flange of the side beam + 1mm. The short side of the rectangle is parallel to the end projection line, and the distance from the inner short side to the end projection line is equal to the embedment width of the front flange of the side beam + 1mm. The other short side of the rectangle extends beyond the end length, completing the 2D sketch.

[0141] The interface automatically returns to the "3D Model" section. Select the "Extrude" command, select the two rectangular sections on the sketch, extrude them, and click the "Difference" button in Boolean operation mode, then click "OK". Next, select the "Chamfer" command to chamfer the inner straight edge of the notch, completing the editing of the top beam part. Figure 5 After that, save and close the part; the automatic update will then be completed in the assembly drawing. T4, Create the horizontal secondary beam part.

[0142] The horizontal secondary beam is connected to the web of the side beam at both ends. The cross-section of the side beam is an asymmetrical I-beam shape, and the front flange extends a certain distance into the door leaf. Therefore, the front corner of the horizontal secondary beam (I-beam) needs to be notched to avoid interference.

[0143] The creation and editing process for horizontal secondary beam parts is basically the same as that for top beams, except that the "stretch" range is between the inner surfaces of the webs of the two side beams; it can be completed by following the steps in T301-T302; the door leaf assembly drawing status after the horizontal secondary beam parts are created ( Figure 6 ).

[0144] T5. Create the front flange of the side beam.

[0145] T501, Create the front flange part of the side beam.

[0146] Click the "Create Component" command on the "Assembly" menu bar, name it "Front Wing Plate of Side Beam", and save it in the same folder; select the XY plane of the side beam coordinate system as the reference plane to create a new sketch, make the sketch of the side beam visible, project the inner arc line of the projection panel, extend the lower end by 10mm, and "offset" the inner arc line inward by the thickness of the front wing plate to obtain another arc line. Use a straight line to close the two ends of the two arc lines to form a closed section, and complete the sketch.

[0147] The operation interface automatically returns to the "3D Model" section. Click the "Extrude" command in the menu bar, select the front wing plate cross-section profile, and asymmetrically extrude it to the design width. After completion, click "OK" to complete the creation of the side beam front wing plate. Right-click in the drawing area and select "Complete Editing" to automatically return the operation interface to the welding component environment assembly section.

[0148] T502, symmetrically project the front flange of the other side beam.

[0149] On the "Assembly" menu bar, click the "Mirror" command to bring up the "Mirror Components" dialog box. Select the front flange of the side beam as the mirror object, then click the "Mirror Plane" button, select the longitudinal center plane of the door leaf, click "Next", and click "OK" after accepting the default system options. The front flange of the other side beam is now symmetrically completed.

[0150] T6. Create a panel bottom edge reinforcement plate.

[0151] The panel bottom edge reinforcement plate is arranged on the inner side of the front flange of the two side beams, in front of the bottom beam, to strengthen the bottom edge of the door leaf.

[0152] Click the "Create Component" command on the "Assembly" menu bar, name it "Bottom Edge Reinforcing Plate," and save it in the same folder. Select the longitudinal center plane as the reference plane to create a new sketch, making the sketch of the central beam visible. Project the outline of the bottom edge reinforcing plate section to complete the sketch. The operation interface will automatically return to the "3D Model" panel of the part environment. Click the "Extrude" command on the menu bar, select the bottom edge reinforcing plate section outline to extrude, select the inner surface of the front flange of the left and right side beams for "Range," and click "OK." The bottom edge reinforcing plate part is now created. Right-click in the drawing area and select "Complete Editing." The operation interface will automatically return to the assembly panel of the welding component environment.

[0153] T7. Create the upper main beam part.

[0154] The main crossbeam has an I-shaped cross section. Its front flange, web, and rear flange are laterally connected to the front flange, web, and rear flange of the side beams, respectively. The main crossbeam is a variable cross-section beam, higher in the middle and lower at both ends along its length. Draw the maximum shape during creation and complete the editing in the component drawing.

[0155] T701, Create the main crossbeam part.

[0156] Click the "Create Component" command on the "Assembly" menu bar, name it "Main Crossbeam," and save it in the same folder. Select the longitudinal center plane as the reference plane to create a new sketch, making the sketch of the central beam visible. Project the outline of the main crossbeam section to complete the sketch. The operation interface will automatically return to the "3D Model" panel. Click the "Extrude" command on the menu bar, select the outline of the main crossbeam section to extrude, select the inner side of the web of the left and right side beams for "Range," and click "OK." The main crossbeam part is now created. Right-click in the drawing area and select "Complete Editing." The operation interface will automatically return to the welding component environment assembly panel.

[0157] T702, Edit the main crossbeam parts.

[0158] The main crossbeam is a variable cross-section beam, created at its maximum shape; therefore, when modifying the component drawing, the unwanted parts must be removed first.

[0159] a. Cutting at the end of the main crossbeam:

[0160] Open the main beam part saved in the folder; the software will automatically enter the part environment interface. In the "3D Model" section of the secondary menu bar, click the "Create 2D Sketch" command. Select the main beam web as the sketch plane, and the projected end and upper and lower flanges as construction lines. Draw the boundary line between the main beam end and the side beam section, the variable cross-section oblique line of the main beam web, and the rear flange of the main beam at the support arm connection, forming a continuous polygonal line. Apply appropriate constraints and dimensions to the projected line. Offset the drawn polygonal line outwards by a distance exceeding the main beam's range, closing both ends to form a region. Complete the 2D sketch; the operation interface will automatically return to the "3D Model" section. Select the "Extrude" command, select the closed section on the sketch to extrude, click the Boolean operation "Difference" button, and then click "OK". One end of the main beam is now cut.

[0161] b. Creation of the diagonal flange of the main crossbeam:

[0162] On the "3D Model" menu bar, click the "Create 2D Sketch" command, and select the side of the main beam web as the sketch plane; project the oblique line cut from the main beam web, offset it outward by the thickness of an oblique flange plate, and draw the welding bevel between the end and the rear flange of the side beam and the horizontal rear flange of the main beam to form a closed section; after completing the sketch, the operation interface will automatically return to the "3D Model" panel, select the "Extrude" command, select the closed section on the sketch to extrude, click the Boolean operation "Union" button, and then extrude asymmetrically in both directions to the flange width. Enter the width value and click "OK"; the rear flange of the main beam oblique end is now created.

[0163] Repeat the above steps to create the rear wing plate at the connection of the main crossbeam arm.

[0164] c. Create connection holes for the rear flange of the main crossbeam.

[0165] On the "3D Model" menu bar, click the "Create 2D Sketch" command and select the rear flange plane of the main crossbeam to create a new sketch; project the edge line of the rear flange of the main crossbeam and the longitudinal center plane of the main crossbeam as construction lines, and draw the cross center lines of the connecting holes based on the projection lines. Then, based on the cross center lines, draw all the connecting holes and label the design dimensions and constraint positions; after completing the 2D sketch, the operation interface will automatically return to the "3D Model" section. Click the "Extrude" command on the menu bar, select all holes to extrude, click the Boolean operation "Difference" button, select "Through" for "Range", and click "OK". The connection holes of the main crossbeam are now created; on the "3D Model" menu bar, click the "Chamfer" command to chamfer the right angles at the weld to avoid interference. One end of the main crossbeam part is now edited.

[0166] On the "3D Model" menu bar, click the "Mirror" command, select all modified features at the end, and mirror them to the other end using the longitudinal center plane as the mirror plane; the main beam part editing is now complete. Figure 7 ).

[0167] Once completed, save and close the component diagram.

[0168] The door leaf assembly model is updated in the welding component environment, and the shape of the main crossbeam changes automatically.

[0169] T8. Create the lower main crossbeam part.

[0170] In the "Assembly" section of the welding component environment, highlight the sketch of the side beam. Select the "Axis" drop-down menu in the menu bar and use the "Create Axis Through Two Points" command to create the axis. Select the center point of the arc panel of the sketches of both side beams, and the axis of the arc door leaf will be created.

[0171] In the "Assembly" section of the welding component environment, click the "Array" command to bring up the "Array" dialog box. Select the upper main crossbeam as the array part, click the "Circular" array button in the dialog box, select the axis of the door leaf as the centerline, enter the arc length between the upper and lower main crossbeams plus the angle corresponding to the welding shrinkage, and then click "OK". The lower main crossbeam part is now created.

[0172] T9. Check whether there is any interference between the horizontal beam system and the vertical beam system of the door leaf.

[0173] The side partition beam MIR and center partition beam MIR symmetrical components created in step T301 are now complete. At this point, all horizontal beam systems (including bottom beams and panel bottom edge reinforcing plates, lower main crossbeams, horizontal secondary beams, upper main crossbeams, and top beams) and vertical beam systems (including side beams and front wing plates, side partition beams, center partition beams, side partition beam MIR, and center partition beam MIR symmetrical components) have been created. Checking for excessive gaps at the joints or interference at the contact points is crucial for ensuring assembly quality.

[0174] In the secondary menu bar of the welding component environment, select the "Inspection" section and click the "Measure" command to measure the gap at the joint, as well as the size and distance of the parts.

[0175] On the "Inspection" section of the secondary menu bar in the welding component environment, click the "Interference Check" command. In the pop-up "Interference Check" dialog box, select the "Define Selection Set 1" button and click the horizontal beam system, then select the "Define Selection Set 2" button and click the vertical beam system, and then click "OK". The software will automatically check the number and volume of interferences and display the interference areas in red. According to the prompts, return to the part environment to make modifications and improvements.

[0176] T10, Door Leaf Panel Creation.

[0177] Click the "Create Component" command on the "Assembly" menu bar, name it "Panel," and save it in the same folder. Select the longitudinal center plane as the reference plane to create a new sketch, making the sketch of the central beam visible. Project the inner and outer arcs of the panel, and close the ends of the arcs to complete the sketch. The operation interface will automatically return to the "3D Model" panel. Click the "Extrude" command on the menu bar, select bidirectional symmetrical extrude of the panel outline, and enter the extrude width equal to the panel design width + 1 / 1000 of the welding shrinkage amount + 40 correction amount, then click "OK." The panel part is now created. Right-click in the drawing area and select "Complete Editing." The operation interface will automatically return to the welding component environment assembly panel.

[0178] At this point, the main components for assembling the curved door leaf have been completed. Figure 8 ).

[0179] Other stiffening plates have simple shapes that can be easily drawn by general technicians, so they will not be described in detail here.

[0180] Creating engineering drawings and AutoCAD drawings of a 3D model includes the following steps.

[0181] V1. Create the door leaf assembly engineering drawing.

[0182] V101, Import engineering drawings into the door leaf assembly model:

[0183] In the Autodesk Inventor software welding component environment interface, click the first-level menu "New File" and select the "Standard.idw" template to create an engineering drawing and enter the engineering drawing environment; then click the "Basic View" button under the "Place View" section of the second-level menu bar, select the door leaf assembly model to import; select "Custom View Direction" for the view direction, and the operation interface will automatically switch to the 3D model interface, select the rear end plate of the lower main crossbeam as the "View Direction", right-click the menu "Complete Custom Direction", and the interface will automatically return to the engineering drawing environment; in the engineering drawing pop-up window, select an appropriate scale and the option to not display hidden lines, and then click "OK" to complete the creation of the main view.

[0184] V102. Create the left view of the door leaf:

[0185] Under the "Placement View" section of the menu bar, click the "Project View" button, select the main view, move it to the right to a suitable position, left-click to position, right-click and select "Create" from the menu. The left view of the door leaf is now created.

[0186] V103. Create a sectional view of the diaphragm beam in the door leaf:

[0187] In the "Place View" section of the menu bar, click the "Section View" button. Select the main view of the door leaf, click at a suitable position above the door leaf, move it vertically downwards across the door leaf area, and then click the left mouse button to terminate the section line. Next, move it vertically to the right to define the direction, click the right mouse button, and then click "Continue" in the menu. Finally, click the left mouse button to "OK" at the placement position. The section view of the door leaf's central beam is now created. Repeat the same process to create the section views of the side beams, lower main beams, etc.

[0188] As needed, sectional views, partial views, etc., of various parts of the assembly drawing can be created.

[0189] V104, Editing and Annotating Graphics:

[0190] In the Autodesk Inventor software drawing environment interface, select the "Dimension" button in the secondary menu bar to enter the dimensioning section, and select the "Dimension" command to dimension the angle between the upper and lower main beams, the angle between the top beam and the horizontal secondary beam, the angle between the bottom beam and the lower main beam, etc. To facilitate measurement when assembling on the curved platform, you can directly dimension the inner chord length of the panel, as well as various control dimensions as needed.

[0191] In the "Annotation" menu bar, select the "Symmetrical Centerline" button, click the two edge lines of the main beam web to generate the centerline of the main beam section; then click the two edge lines of the horizontal secondary beam web to generate the centerline of the horizontal secondary beam section.

[0192] Using the same method, you can obtain the bisectors of the required parts, the center lines of each view, etc.

[0193] V105, Insert Parts List, Extract Part Numbers:

[0194] In the welding component environment, select the "BOM" button in the "Management" section of the secondary menu bar. In the pop-up "BOM" dialog box, select "Export BOM" and click "OK" in the pop-up window. Name it "Parts List" ".xlsx" and save it in the same folder. The parts list for the door leaf assembly will be automatically generated. Edit the table content as appropriate and insert it in the appropriate position on the engineering drawing to complete the process.

[0195] In the "Annotation" section menu bar, select the "Automatic Leaderout Number" button. In the "Automatic Leaderout Number" pop-up window, select the "Placement Method" and "Leaderout Number Shape," then select the feature part of the part to be labeled on the view. Right-click and select "Continue," then left-click to select the placement location. In the pop-up window, select "Apply." The part numbers for the door leaf assembly will be automatically generated. Based on the parts list numbers, edit the leaderout numbers to complete the process. Move the leaderout numbers to appropriate positions and refine the view. The door leaf assembly drawing is now complete. Figure 9 ).

[0196] Save the door leaf assembly engineering drawing and the door leaf assembly model in the same folder. The engineering drawing is a file that follows the 3D model. If the 3D model is modified and saved, the engineering drawing will also be updated and changed.

[0197] V2. Create AutoCAD drawings of the door leaf assembly.

[0198] After the door leaf assembly drawing is created, in the drawing environment interface, click the "File" drop-down menu in the secondary menu bar, select "Save As" and then "Save Copy As". In the pop-up "Save Copy As" window, select "AutoCAD DWG file" as the save type, adjust the appropriate version of the file in "Options", and click "Finish". The door leaf assembly drawing ".dwg" format file will be generated and saved in the same folder.

[0199] It is important to emphasize that by clicking the "File" drop-down menu in the secondary menu bar of the welding component environment and selecting the "Export" command, the drawn door leaf assembly model can be directly converted into an AutoCAD ".dwg" 3D drawing, photo, 3D PDF, etc. Using Autodesk Inventor software, open the components saved in the door leaf assembly folder: main beam model, bottom beam, top beam, horizontal secondary beam, side beam, side partition beam, central partition beam, side beam front flange, etc.; create their engineering drawings according to the V1 steps and save them in the same folder; then follow the V2 steps to obtain their "AutoCAD DWG files"; the operation methods are basically the same and will not be described in detail again.

[0200] AutoCAD software is used to edit graphics.

[0201] Opening a ".dwg" format drawing created in AutoCAD software allows you to change line types and set layers, and edit and simplify the drawing according to process requirements.

[0202] When used for CNC cutting machine blanking, add the secondary welding shrinkage and machining allowance to the width and length dimensions, and modify the size and shape of the graphic; delete the marked dimensions and other unnecessary line segments, arrange the material reasonably according to the steel plate specifications, and input it into the CNC cutting machine control system to cut out the part shape.

[0203] Since AutoCAD is a commonly used software, and ordinary professional technicians can use it proficiently, it will not be explained in detail.

[0204] It should be clarified that: when converting engineering drawings created using Autodesk Inventor software into ".dwg" format CAD drawings, regardless of the scale of the original engineering drawings, the shape and size of the parts in the CAD drawings will always be at a 1:1 scale.

[0205] The component drawings created by Autodesk Inventor software are presented as a whole. When laying out the components, they need to be broken down into individual drawings of different sheet materials. When assembling the parts, detailed material specifications need to be drawn.

[0206] This invention proposes a method for obtaining manufacturing process drawings of curved gate leaves based on 3D modeling and layout using Autodesk Inventor software. The software is digitally driven; users first draw straight lines or other geometric shapes, then constrain their positions and add dimensions. Different input values ​​for the dimensions automatically change their corresponding lengths and angles. This method is highly suitable for the layout process of curved gates.

[0207] This invention utilizes Autodesk Inventor software to create a side view of the door leaf: a side beam plan view, which is then extruded to generate a side beam model; this is saved as a partition beam part. The side beam sketch is modified to match the dimensions and shape of the partition beam cross-section and updated, automatically generating the partition beam model. The side beam and partition beam models are imported into the assembly environment, allowing the creation of other related component models, such as main beams, top beams, bottom beams, and horizontal secondary beams, within the assembly drawing. Newly created components generate corresponding models. Drawing component models in the assembly drawing environment simulates the overall assembly process of the door leaf. After verifying all parameters, the 3D model is converted into an engineering drawing (".idw"). The engineering drawing is then edited with dimensions and converted into an AutoCAD drawing. In AutoCAD, simplified editing yields the component drawings (".dwg") required for each manufacturing process. After the component drawings are laid out, they are input into a CNC cutting machine control program for automatic cutting and blanking. The component drawings guide the assembly and welding of the components into a complete assembly, as well as the overall assembly process of the components on an arc-shaped platform. Because the manufacturing of components involves controlling the size and shape of the parts in an assembled state, assembling the door leaf is like "building blocks"—simply placing them in the corresponding positions to achieve the desired result. Through appropriate welding procedures, high-quality curved door leaves can be manufactured.

[0208] This invention uses digital technology to lead the traditional steel structure manufacturing process. In addition to meeting the requirements of CNC cutting machines for material cutting, the three-dimensional model can guide the alignment and dimensional inspection during the component assembly process, making the manufacturing process easier to implement and control, thereby improving product quality, saving process time, and increasing labor efficiency.

[0209] The following explanation uses the arc-shaped gate of a reservoir spillway as an example.

[0210] Figure 9 This is a design drawing of an arc-shaped gate for a reservoir spillway: it belongs to a main beam frame structure, with a design radius R = 10m, panel thickness 10mm, width 7960mm, distance from the outer edge of the panel to the rear flange of the main beam 900mm, the included angle between the upper and lower main beams corresponding to an arc length of 4000mm at the outer edge of the panel, the center distance between the upper and lower main beams 3616mm, and the allowable error of the current standard ±3mm. The arc length of the top and bottom beams of the gate leaf is 7500mm, and the design arc length at both ends of the top and bottom of the panel is L = 7754. The central angle 2α corresponding to the design arc length at both ends of the top and bottom of the panel is 44.427147°. Based on the curvature radius layout formula and factory manufacturing experience, the layout radius R′ of the gate leaf is taken as 10045mm. The welding shrinkage arc length and door leaf width are both controlled at 1 / 1000mm. The top and bottom beams are [14b channel steel, and the horizontal secondary beams are I14 I-beams. The cross-sectional dimensions do not include welding shrinkage. Add 20mm cutting allowance to each of the four sides of the door panel.

[0211] This invention is based on 3D modeling and lofting using Autodesk Inventor Professional 2018 software, and the editing and simplification of component drawings are completed in AutoCAD 2018 software; the implementation process includes the following steps.

[0212] Create the central partition beam.

[0213] It should be noted that the central partition beam is located in the middle of the arched door leaf, which reflects the structural characteristics of the horizontal beam system. It is also easy to edit, and after completion, it can be converted into a side partition beam or side beam component with slight modifications.

[0214] 1.1 Create a two-dimensional sketch of the central beam section.

[0215] In the sheet metal parts environment, create a side sectional view of the plane where the central partition beam of the arched door leaf is located, and draw the cross sections of the panel, bottom beam, main cross beam, horizontal secondary beam, top beam, as well as the outline of the web of the central partition beam and the cross section of the rear wing plate.

[0216] To achieve this, follow steps S101-S106: Open the Autodesk Inventor software, click the "New" button in the first-level menu bar, and the "New File" dialog box will pop up. For door leaf structures that are welded parts, select the "Sheet Metal.ipt" template to create a sheet metal part.

[0217] 1.1.1 Setting the unit precision only sets the display precision; the precision of the drawing depends on the precision of the input values.

[0218] 1.1.2 Draw the center line of the main crossbeam and the rear flange:

[0219] In the sheet metal parts environment, in the "3D Model" section of the secondary menu bar, click the "Start Creating 2D Sketch" command; create a new sketch on the xy plane, draw the sectional view of the partition beam in the door leaf design, draw the center line of the lower main crossbeam section with the arc door layout radius R′, and position the right end at the original coordinate point, with the position constraint being horizontal; then draw the center line of the upper main crossbeam, and mark the included angle θ between the two center lines:

[0220]

[0221] L = 4000mm, R′ = 10045mm, and the included angle θ between the upper and lower main crossbeams is 22.83845706°.

[0222] In the "Sketch" panel, click the "Rectangle" drop-down menu, select the "Rectangle Three Points" command, and draw two rectangles at arbitrary positions near the left end of the center line. Label the width and thickness of the main beam rear flange section, constrain the long side to be perpendicular to the center line, and label the distance from the left end of the center line as equal to the panel thickness + the main beam height × (1 + 1 / 1000) mm.

[0223] Among them, 1 / 1000 is the welding shrinkage allowance; after completion, mark the layout center distance of the rear flange of the upper and lower main crossbeams, which should be greater than the deviation of 1-2mm in the specification; if it does not meet the requirement, increase the welding shrinkage allowance.

[0224] Note: It is impossible for the door leaf to shrink completely during welding. The door leaf is considered qualified if the center distance between the upper and lower main beams reaches the deviation specified in the standard after welding. The purpose of this step is to verify whether the added welding shrinkage is appropriate.

[0225] It should be emphasized that: for all angle values ​​involved in the layout of curved door leaves, the values ​​calculated using the above "θ angle formula" shall be used, not the angles in the original design drawings.

[0226] 1.1.3. Draw the panel curve:

[0227] In the "Sketch" section, select the "Arc" dropdown menu and then the "Center Arc" button. Draw the outer arc of the door panel with the original sketch coordinates as the center and R′ as the radius. Alternatively, you can use the "Line" command to first draw the construction lines at the top and bottom of the panel, marking the angles corresponding to the lofted arc lengths of the center lines of the top and bottom main beams. Then, draw the entire circle and use the "Trim" command to obtain the outer arc of the panel. Finally, offset it inward by one panel thickness to obtain the inner arc of the panel.

[0228] 1.1.4. Draw the cross section of the main beam:

[0229] The main crossbeam has an I-shaped cross section, while the front flange and web have rectangular cross sections. The simplest command is to draw a rectangle at any position using the "three-point rectangle" command, mark the design length and width dimensions, and then constrain it to the specified position. Of course, drawing a closed quadrilateral using the "line" command and then constraining the position and marking the dimensions can achieve the same effect, but the steps are more cumbersome.

[0230] 1.1.5. Draw the cross-sections of the bottom beam, top beam, and horizontal secondary beam:

[0231] The bottom and top beams are standard channel steel, and the horizontal secondary beams are standard I-beams, with standard cross-sectional shapes. Therefore, they are created by inserting CAD blocks. After the blocks are inserted into the Autodesk Inventor software sketch, they will be "exploded" into line segments, requiring the addition of shape and size constraints to fix them into a single unit for use. In the sheet metal parts environment, the steel sections can also be created using the "Line" and "Arc" commands in the "Sketch" panel, and can be reused multiple times by "copying" and "pasting".

[0232] 1.1.6. Draw the outline of the web of the central diaphragm beam:

[0233] The web of the central partition beam is arranged between the bottom beam and the lower main crossbeam, the lower main crossbeam and the upper main crossbeam, and the upper main crossbeam and the top beam. Its ends connect to the sides of the beam, and its front edge connects to the inner arc of the panel. A notch needs to be reserved to cross the horizontal secondary beam. Right-angle welds and chamfers need to be drawn at the arcs of the cross-section to avoid interference during assembly. The inner endpoints of the rear flanges connecting the bottom beam and the lower main crossbeam, the lower main crossbeam and the upper main crossbeam, and the upper main crossbeam and the top beam form a straight line on the front plane of the rear flange. The web section of the central partition beam forms three closed regions (upper partition beam web, middle partition beam web, and bottom partition beam web). The middle partition beam web is nearly 4 meters long. For ease of transportation, the door leaf needs to be manufactured in sections, and the middle partition beam web also needs to be divided into upper and lower sections. The straight line on the front plane of the rear flange of the central partition beam is offset backward by one design plate thickness to obtain the straight line on the rear plane of the rear flange. Butt bevels are drawn at both ends to form a closed region. The rear flange cross-section is now complete (see...). Figure 1 ).

[0234] 1.2 Creating the central diaphragm model:

[0235] This is completed via step S02, specifically involving the "Extrude" command. In Autodesk Inventor software, the "Extrude" and "Revolve" modeling commands require closed surfaces to create a solid; therefore, all connecting lines must be closed. If a solid cannot be created, the sketch needs to be edited to check the closure of the lines. The central beam model is now complete (see...). Figure 2 As shown in the figure.

[0236] Create a side beam.

[0237] After completing step "A2", there's no need to redraw the drawing. Save the "Central Divider Beam Model" as a "Side Divider Beam" file. Open it again in the sheet metal parts environment and use the "Edit Sketch" command to modify the sketch into the shape of a side divider beam. Use the "Edit Features" command to modify the sheet thickness, width, etc., during the extrusion process to complete the creation of the side divider beam (see...). Figure 3 Create the edge beam.

[0238] The process is completed through step "A3", which is basically the same as the method for creating a side beam.

[0239] It should be noted that: the side beam has a front flange, and the arc of the side beam web needs to be reduced by the thickness of the front flange. The main crossbeams and horizontal secondary beams are arranged inside the side beam web, so there are no notches in the side beam web. The side beam model is now complete (see...). Figure 4 Create a door leaf assembly.

[0240] Import the central partition beam, side partition beam, and side beam parts created in the sheet metal parts environment into the welding parts environment, create a door leaf assembly drawing for simulated assembly, and then draw the bottom beam, main crossbeam, horizontal secondary beam, top beam, and other parts according to the position of the assembly state.

[0241] 4.1. Import parts into the assembly drawing.

[0242] The "T1-T2" steps are used to import the edge beams, edge partition beams, and center partition beams.

[0243] T1. Importing the Edge Beam into the Assembly Drawing: Open Autodesk Inventor software. In the initial interface (or sheet metal part environment), click the first-level menu "New File" and select the "Weldment.iam" template to create a new sheet metal part, entering the welding part environment interface; then click the "Placement" button under the "Assembly" section of the second-level menu bar, and select the edge beam created above to import; click the "Constraint" button, select the constraint type as "Surface Alignment", and align the original coordinate system "YZ, XZ, XY" planes of the assembly section with the original coordinate system planes of the edge beam one by one; fix the edge beam in the assembly coordinate system.

[0244] T2, side partition beams, and center partition beams are imported into the assembly drawing:

[0245] The operation method is basically the same as step "T1", except that it only aligns with the "YZ" and "XZ" planes of the part's coordinate system; the "XY" plane deviates from the original XY plane of the assembly environment coordinate system (design spacing + 0.1% welding shrinkage). According to the design dimensions and welding shrinkage: the side partition beam deviates by 1400×(1+1 / 1000)=1401.4mm; the middle partition beam deviates by 3000×(1+1 / 1000)=3003mm.

[0246] The positions of the side beams, side partition beams, and center partition beams are fixed in the assembly drawing by adjusting the alignment or offset distance of the coordinate system plane.

[0247] 4.2 Create the bottom beam and top beam parts.

[0248] T301: Use the "Offset from Plane" command to create the longitudinal center plane of the door leaf. Use the "Mirror" command to create symmetrical parts for the other side beam, side partition beam, and central partition beam. Left-click on the symmetrical parts of the side partition beam and central partition beam in the "Model Browser" interface, and right-click to uncheck the "Visibility" box to hide them.

[0249] T302. Creating the Bottom Beam and Top Beam Parts: Click the "Create Component" command on the "Assembly" menu bar, name it "Bottom Beam," and save it in the same folder. Select the longitudinal center plane as the reference plane to create a new sketch, making the sketch of the central beam visible. Project the outline of the bottom beam channel steel section to complete the sketch. The operation interface will automatically return to the "3D Model" panel of the part environment. Click the "Extrude" command on the menu bar, select the outline of the bottom beam channel steel section, and select the outer surface of the rear flange of the left and right side beams for the "Extrude Range," then click "OK." The bottom beam part is now created. Right-click in the drawing area and select "Complete Editing." The operation interface will automatically return to the assembly panel of the welding component environment.

[0250] Repeat the above steps to create the top beam part.

[0251] Note: In Autodesk Inventor software, after creating a part in the "Assembly" panel of the component environment, naming the part, and specifying its save location, the interface automatically switches to the "3D Model" panel of the component environment. The subsequent operations are exactly the same as when creating the part.

[0252] T303. Edit the top beam part; the inner side of the front flange of the side beam connects with the front corner limb of the top beam (channel steel), therefore, the end of the top beam needs to be edited to create a corresponding notch. This avoids interference with the front flange of the side beam during assembly. Open the top beam part saved in the folder to enter the part environment interface. In the "3D Model" section of the secondary menu bar, click the "Create 2D Sketch" command, select the back of the channel steel of the top beam as the sketch plane, project the end line, and use the corner limb line of the channel steel on the side of the panel as the construction line; draw a rectangle at the end, with the long side of the rectangle parallel to the corner limb projection line, and the dimension equal to the thickness of the front flange of the side beam + 1mm; the short side of the rectangle is parallel to the end projection line, and the distance from the inner short side to the end projection line is equal to the embedment width of the front flange of the side beam + 1mm, and the other short side of the rectangle extends beyond the end length. Complete the 2D sketch; the operation interface automatically returns to the "3D Model" section, select the "Extrude" command, select the two rectangular sections on the sketch and extrude, click the "Difference" button in Boolean operation mode, and then click "OK". Next, select the "Chamfer" command to chamfer the inner straight edge of the notch. After completing the editing of the top beam part (Figure T03), save and close the part. It will then be automatically updated in the assembly drawing.

[0253] Note: Parts created in the "Assembly" panel of the Autodesk Inventor software's component environment can be directly edited in the "Model Browser" of the "Assembly" panel. However, the surrounding parts are faint and obstruct the view. Therefore, it is simpler to open the part and edit it directly.

[0254] 4.3 Create the horizontal secondary beam and the front flange of the edge beam.

[0255] T4. Create the horizontal secondary beam component:

[0256] The steps for creating and editing horizontal secondary beam parts are basically the same as those for top beams, the difference being that the "stretch" operation is limited to the inner sides of the webs of both beams. This can be completed by following the procedures outlined in T301-T302.

[0257] T5. Create the front flange of the side beam.

[0258] Following step T501, first create the front flange part of one side beam. Selecting the XY plane of the side beam coordinate system as the supporting plane for creating the front flange reduces interference from the faintly visible central and side beams, facilitating the projection of the inner edge arc of the panel. Offset the thickness of the front flange to obtain another arc. Close the ends of the two arcs with straight lines to obtain the front flange cross-section. Asymmetrically stretch the front flange in both directions to the designed width to obtain the side beam front flange part.

[0259] T502 uses the "mirror" command to symmetrically display the front flange of the other side beam.

[0260] T6. Create the panel bottom edge reinforcement plate:

[0261] Select the longitudinal center plane as the reference plane to create a sketch. Extrude the "range" between the inner sides of the front flanges of the left and right side beams. The other steps are the same, and the bottom edge reinforcement plate part can be created.

[0262] 4.4 Create the upper main beam part.

[0263] Create the upper main crossbeam part using step T701.

[0264] Click the "Create Component" command in the "Assembly" menu bar, name it "Main Crossbeam," and save it in the same folder. Select the longitudinal center plane as the reference plane to create a new sketch, making the sketch of the central beam visible. Project the outline of the main crossbeam section to complete the sketch. The interface will automatically return to the "3D Model" panel. Click the "Extrude" command in the menu bar, select the outline of the main crossbeam section to extrude, choose the inner surface of the web of the left and right side beams for "Range," and click "OK." The main crossbeam part is now created. Right-click in the drawing area and select "Finish Editing." The interface will automatically return to the welding component environment assembly panel.

[0265] T702, Editing the main crossbeam parts:

[0266] The main crossbeam is a variable cross-section beam, created at its maximum shape. Therefore, when modifying the component drawing, the unwanted parts must first be removed.

[0267] Open the main beam part and edit its environment. Create a new sketch on the web plane of the main beam, using the projected ends and upper and lower flanges as construction lines. Use the "Line" command to draw continuous polylines for the cut section, dimension them, and constrain their positions relative to the construction lines. After completion, close the continuous polylines into a region larger than the cut section. Use the "Difference" function of the "Extrude" command to cut off the unwanted portion at the end of the main beam.

[0268] The cut-out web of the main beam needs to have a rear flange added to its oblique side. One end is connected to the rear flange of the side beam, and the other end is obliquely connected to the rear flange of the main beam. The thickness and width of the rear flange at the connection between the main beam and the support arm are different, and they are created separately through the "T07②b" operation steps.

[0269] In step “T702c”, create a sketch on the rear flange plane of the main crossbeam, draw the bolt holes, and use the “Difference” method of the “Extrude” command to create the bolt holes for the main crossbeam. After modifying one end of the main crossbeam, use the “Mirror” command to modify the other end. The main crossbeam modification is complete (see...). Figure 5 ).

[0270] 4.5. Check the gaps and interference of the door leaf assembly parts.

[0271] All components created for the door leaf assembly are manufactured as solid parts and assembled on a curved platform. Therefore, checking whether the gaps between them are appropriate and avoiding interference is a key process to ensure the manufacturing quality of the door leaf.

[0272] Reveal all parts and use step "T9" to check for gaps or interference between the horizontal and vertical beam systems of the door leaf. Alternatively, you can select any two parts to check, and then return to the part environment to modify and improve them based on the inspection results.

[0273] 4.6. Creating the door leaf panel.

[0274] The panel is created last to facilitate observation of the drawings and avoid obstructing the view. This is completed through the "T10" operation step, at which point the main components of the curved door leaf assembly are finished (see...). Figure 6 ).

[0275] Create engineering drawings and AutoCAD drawings of 3D models.

[0276] Engineering drawings are created in the Autodesk Inventor software drawing environment.

[0277] 5.1 Create the door leaf assembly engineering drawing.

[0278] Import the door leaf assembly model into the engineering drawing using the "V101" step.

[0279] In the Autodesk Inventor software welding component environment interface, click the first-level menu "New File" and select the "Standard.idw" template to create an engineering drawing and enter the engineering drawing environment. Click the "Basic View" button under the "Place View" section of the second-level menu bar, select the door leaf assembly model to import; select "Custom View Direction" for the view direction, and the operation interface will automatically switch to the 3D model interface. Select the rear end plate of the lower main crossbeam as the "View Direction", right-click the menu and select "Complete Custom Direction", and the interface will automatically return to the engineering drawing environment; in the engineering drawing pop-up window, select an appropriate scale and the option to not display hidden lines, and then click "OK". The main view creation is complete.

[0280] V102. Create the left view of the door leaf:

[0281] Under the "Placement View" section of the menu bar, click the "Project View" button, select the main view, move it to the right to a suitable position, left-click to position, right-click and select "Create" from the menu. The left view of the door leaf is now created.

[0282] V103. Create a sectional view of the diaphragm beam in the door leaf:

[0283] In the "Place View" section of the menu bar, click the "Section View" button. Select the main view of the door leaf, click at a suitable position above the door leaf, and then move it vertically downwards beyond the door leaf's range. Click the left mouse button to terminate the section line, then move it vertically to the right to define the direction. Click the right mouse button and select "Continue" from the menu. Click the left mouse button to confirm at the placement position. The section view of the door leaf's central beam is now created. Repeat the same process to create the section views of the side beams, lower main beams, etc.

[0284] V104 Edit Annotation Graphics:

[0285] In the Autodesk Inventor software drawing environment interface, select the "Dimension" button in the secondary menu bar to enter the dimensioning section, and select the "Dimension" command to dimension the angle between the upper and lower main beams, the angle between the top beam and the horizontal secondary beam, the angle between the bottom beam and the lower main beam, etc. To facilitate measurement when assembling on the curved platform, you can directly dimension the inner chord length of the panel, as well as various control dimensions as needed.

[0286] In the "Annotation" menu, select the "Symmetry Centerline" button, click the two edge lines of the main beam web to generate the centerline of the main beam section; then click the two edge lines of the horizontal secondary beam web to generate the centerline of the horizontal secondary beam section. Repeat this process to obtain the bisectors of the required parts, the centerlines of various views, etc.

[0287] Note: The precision of the dimensions in the engineering annotations can be modified as needed. Select the dimension with the left mouse button, and the "Precision" command in the right-click menu can be used to modify the number of digits displayed. The angle unit is degrees, minutes, and seconds depending on the template used. You can change it to decimal format by using the "Edit Dimension Style" command in the right-click menu.

[0288] V105, Insert Parts List, Extract Part Numbers:

[0289] In the welding component environment, select the "BOM" button in the "Management" section of the secondary menu bar. In the pop-up "BOM" dialog box, select "Export BOM" and click "OK" in the pop-up window. Name it Parts List (.xlsx) and save it in the same folder. The parts list for the door leaf assembly will be automatically generated. Edit the table content appropriately and insert it in the appropriate position on the engineering drawing.

[0290] In the "Annotation" section menu, select the "Automatic Leaderout Number" button. In the "Automatic Leaderout Number" pop-up window, select the "Placement Method" and "Leaderout Number Shape," then select the feature part of the part to be annotated in the view. Right-click and select "Continue," then left-click to select the placement location, and finally select "Apply" in the pop-up window. The part numbers for the door leaf assembly will be automatically generated. Edit the leaderout numbers according to the parts list numbers to complete the process. Move the leaderout numbers to appropriate positions and refine the view. The door leaf assembly drawing is now complete (see Figure V01). Save the door leaf assembly drawing (.idw) in the same folder. The drawing is a follow-up file to the 3D model; modifications to the 3D model will update the drawing accordingly.

[0291] Note: In the engineering drawing environment, the "Itemized List" section of the "Annotation" submenu can also be used to insert and edit parts lists.

[0292] 5.2 Create the AutoCAD drawing of the door leaf assembly.

[0293] Create the AutoCAD drawing of the door leaf assembly using the "V2" step.

[0294] After the door leaf assembly drawing is created, in the drawing environment interface, click the "File" drop-down menu in the secondary menu bar, select "Save As" and then "Save Copy As". The "Save Copy As" window will pop up: select "AutoCAD DWG file" as the save type, adjust the appropriate version of the file in "Options", and click "Finish". The door leaf assembly drawing (.dwg) format file will be generated and saved in the same folder.

[0295] V3. Create engineering drawings and AutoCAD drawings for door leaf parts.

[0296] Using Autodesk Inventor software, open the components saved in the door leaf assembly folder: main crossbeam, bottom beam, top beam, horizontal secondary beam, side beam, side partition beam, central partition beam, and side beam front flange. Create their engineering drawings following the steps in V01 and save them in the same folder; then follow the steps in V02 to obtain their "AutoCAD DWG files". The operation methods are basically the same.

[0297] It should be noted that: in the welding component environment's secondary menu bar, clicking the "File" drop-down menu and selecting the "Export" command can directly convert the drawn door leaf assembly model into AutoCAD (.dwg) 3D drawings, photos, 3D PDFs, etc. (AutoCAD software can be used to edit graphics.)

[0298] Opening the created (.dwg) format drawing in AutoCAD software allows you to change line types and set layers, simplifying the drawing according to process requirements. When using it for CNC cutting machine blanking, you can add secondary welding shrinkage and machining allowances to the width and length dimensions, and modify the size and shape of the drawing. Delete dimension annotations and other unnecessary line segments, arrange the material reasonably according to the steel plate specifications, and input the data into the CNC cutting machine control system to cut the part shape. The completed blanking drawing for the side beam, partition beam, main beam, and web plate is shown in [link to drawing]. Figure 7 ".

[0299] Note: Editing drawings in AutoCAD software is mainly used for part layout and cutting. The modified drawings can be made into blocks for easy movement during layout.

[0300] In this invention, the layout radius R' of the door leaf is first calculated using the formula for the radius of curvature. The welding shrinkage of the curved door leaf is increased by 1 / 1000 of the arc length, and the width of the door leaf and the height of the main crossbeam are increased by the same amount. No welding shrinkage is added to the cross section of the steel beam. A 20mm correction allowance is reserved around the perimeter of the door leaf. All plate thicknesses are based on the design drawings. The secondary welding shrinkage when the main crossbeam parts are assembled and welded into components is further increased by adding welding allowance on the part cutting drawing in CAD drawing. According to the characteristics of the curved door leaf structure, the longitudinal cross-sectional shape of the partition beam is different in the middle of the door leaf and at different connection positions between the main crossbeam and the support arm. Therefore, it is divided into central partition beam and side partition beam and created separately. First, the central partition beam, side partition beam and side beam are created as part models, and then the assembly module of the component environment is imported to create other parts. The layout process is based on 3D modeling in Autodesk Inventor Professional 2018 software, and the part drawings are edited and simplified in AutoCAD 2018 software.

[0301] The assembly models and AutoCAD drawings of the side beams, side partition beams, central partition beams, and door leaf assemblies obtained by this method have the following main uses and effects:

[0302] 1. Digital-driven software facilitates graphic modification. Similar structures can be transformed into new parts with slight modifications, reducing the workload of drawing. For example, the side beams, side partition beams, and central partition beams of an arc-shaped gate leaf can be transformed into another part simply by creating one part and modifying the sketch and modeling commands.

[0303] 2. AutoCAD Drawings: AutoCAD software simplifies drawing editing, adding welding shrinkage and machining allowances in the width and length directions to create a cutting process drawing. After rationally arranging the steel plates according to different specifications, the drawing is input into the CNC cutting machine control system to directly cut out the part's dimensions and shape; this reduces the cutting programming steps. Parts are cut to their assembled shape and dimensions, resulting in more precise dimensions and shapes. No corrections are needed when assembling components, thus improving manufacturing quality and efficiency.

[0304] 3. Engineering drawings and AutoCAD graphics can be directly printed out as paper copies to guide the production process. Taking the engineering drawings and AutoCAD graphics obtained from the door leaf assembly model as an example, the main crossbeam shown in the diagram is drawn with its shape and dimensions based on the simulated assembly position; the door leaf panel laid on the curved platform has its assembly lines drawn according to the dimensions of the door leaf in its assembled state. After the main crossbeam is manufactured and placed on the curved platform, it is aligned with the assembly lines to achieve the theoretical assembly state. This reduces unnecessary adjustments and corrections during the assembly process, thereby reducing the workload and labor intensity of the assembly process.

[0305] 4. The 3D model of the gate leaf structure components can be exported as a 3D PDF file. The rotation angle and position can be moved for all-round observation. This can be used for technical briefing before manufacturing, making it easier for workers to understand the spatial three-dimensional structure of the arc gate leaf and reducing unnecessary errors in the manufacturing process.

[0306] 5. The "Inspection" function of Autodesk Inventor software can be used to measure the relative position, length, angle, distance, etc. of parts, guide the dimensional measurement and inspection of the assembly process, make quality control easier to achieve and ensure, and thus improve the manufacturing quality and inspection level of the door leaf;

[0307] This method uses 3D modeling, engineering drawings, and AutoCAD graphics of the curved door leaf to guide the cutting of parts, as well as the alignment, inspection, and measurement during the fabrication of components and the assembly of the door leaf. It provides direct technical guidance and theoretical reference for the manufacturing process, facilitating the operation of each process and making it easier to achieve manufacturing quality control, thus possessing innovative and practical significance.

[0308] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for generating manufacturing drawings of an arc gate vane component from a digital model lofting, characterized in that, Based on Autodesk Inventor software three-dimensional modeling lofting, and obtain engineering drawings; through format conversion to generate Auto CAD format parts drawing; parts drawing after editing, import CNC cutting machine automatic cutting blanking; The steps are as follows: A1, create the middle beam; A2, create the edge beam: modify the middle beam file to get the edge beam file; A3, create the edge beam: modify the middle beam file to get the edge beam file; A4, create the leaf assembly; A5, create the engineering drawing of three-dimensional model and Auto CAD drawing; A6, Auto CAD software editing graphics: for CNC cutting machine blanking, add the secondary welding shrinkage and machining allowance to the width and length size, modify the size and shape of the graphics; according to the steel plate specification, input the CNC cutting machine control system to cut out the part shape; open the created ".dwg" format graphics in Auto CAD software, which can change the line type and set the layer, edit and simplify the graphics according to the process requirements; Among them: In step A1, the following steps are included: S1, use Autodesk Inventor software to establish the two-dimensional sketch of the cross section of the door leaf middle beam; S101, unit precision setting: S102, draw the center line of the main beam and the rear wing plate: In the sheet metal parts environment, click the "Start creating two-dimensional sketch" command in the "Three-dimensional model" section of the secondary menu bar; create a sketch on the xy plane, and draw the sectional view of the door leaf design in the crossbeam; draw the center line of the lower main crossbeam section with the arc lofting radius R', and position the right end at the original coordinate point with the position constraint of horizontal; then draw the center line of the upper main crossbeam, and label the included angle between the two center lines : ； Draw the rear wing plate cross section rectangle of the main beam perpendicular to the center line of the lower main beam, and mark the size to the left end point of the center line = panel thickness + main beam design height + one thousandth shrinkage; then draw the center line of the upper main beam with the original coordinate point and R' length, the angle is the arc length between the two main beams + the corresponding value of one thousandth shrinkage; draw the upper main beam rear wing plate cross section rectangle, which is perpendicular to the center line and the distance from the left end point of the center line is equal to the design value plus 1 / 1000 shrinkage; S103, draw the panel arc line: In the "circle" drop-down menu of the "sketch" block menu, select the "circle center arc" button to draw the door leaf panel outer arc line with the sketch original coordinate point as the center and R' as the radius; similarly, use the "straight line" command to draw the construction lines at the upper and lower ends of the panel, respectively mark the angles corresponding to the lofting arc length of the upper and lower main beam center lines, then draw the whole circle to get the panel outer arc line by "trim" command, and offset the inner side by a panel thickness to get the panel inner arc line; S104, draw the main beam cross section: S105, draw the bottom beam, top beam and horizontal secondary beam cross section: S106, draw the middle beam web profile: S2, create the middle beam model: after completing the sketch, "stretch" to get the three-dimensional model; In step A2, the following steps are included: Save the middle beam model as an edge beam file ".ipt format"; modify the different sizes and shapes on the sketch by "edit sketch" command, and modify the generated different sizes by "edit feature"; after modifying the shape and size of the middle diaphragm beam web wing plate, it becomes an edge beam; In step A3, the following steps are included: Save the model of the middle beam as the side beam file in ".ipt" format; modify the different sizes and shapes on the sketch by the "Edit Sketch" command, and stretch the generated different sizes by the "Edit Feature" modification; after the modification, it becomes the side beam; In step A4, the door leaf assembly model is created in the software component environment interface; including the following steps: T1, the side beam is called into the assembly drawing; select the "Weldment.iam" template to create a sheet metal component, enter the welding component environment interface; click the "Place" button under the "Assembly" block, select the side beam to call in, and fix it in the assembly coordinate system; T2, the side beam and the middle beam are called into the assembly drawing; Click the "Place" button under the "Assembly" block in the secondary menu bar, select the side beam created above to call in, click the "Constraint" button, select the constraint type as "Surface flush", and select the corresponding alignment of the assembly block original coordinate system "YZ, XZ" plane and the side beam coordinate system YZ, XZ plane; the XY plane of the side beam coordinate system is offset from the XY plane of the assembly environment original coordinate system by a welding shrinkage of "design distance + 1 / 1000"; click the "OK" button in the dialog box to end the command, and the position of the side beam is fixed; T3, create the bottom beam and top beam parts; T301, create the side beam, side beam and middle beam symmetric parts; Select the "From plane offset" button under the "Plane" drop-down menu in the "Assembly" block menu bar, select the assembly original coordinate system XY plane, offset to the middle beam side by "1 / 2 of the side beam center distance + 1 / 1000 of the welding shrinkage", and name it "longitudinal center plane"; the door leaf longitudinal center plane is created; Click the "Mirror" command on the "Assembly" block menu bar, select the side beam, side beam and middle beam as the object in the pop-up "Mirror parts" dialog box, click the "Mirror plane" button, select the door leaf longitudinal center plane, click "Next", and then click the "OK" button after selecting the default system options; T302, create the bottom beam and top beam parts; Click the "Create parts" command on the "Assembly" block menu bar, name it "bottom beam", and save it in the same folder; select the longitudinal center plane as the reference plane to create a sketch, make the middle beam sketch visible, and project the profile line of the bottom beam channel steel section to complete the sketch; T303, edit the top beam part; The inner side of the front wing plate of the side beam is connected with the front corner limb of the top beam; the end of the top beam needs to be edited to open a corresponding notch to avoid interference with the front wing plate of the side beam during assembly; Open the top beam part saved in the folder, and the software automatically enters the part environment interface; click the "Create 2D sketch" command on the "3D model" block in the secondary menu bar, select the top beam channel steel back as the sketch plane, project the end head line, and the panel side corner limb line as the construction line; draw a rectangle for each end head, with the long side of the rectangle parallel to the corner limb projection line, and the labeled size equal to the thickness of the front wing plate of the side beam + 1mm; the short side of the rectangle is parallel to the end head projection line, and the distance from the short side to the end head projection line is equal to the embedded width of the front wing plate of the side beam + 1mm, and the other short side of the rectangle exceeds the length of the end head, completing the 2D sketch; T4, create the horizontal secondary beam part; The horizontal secondary beam is connected with the edge beam web, the edge beam cross section is asymmetric I-shaped, the front wing plate extends to the inside of the door leaf by a distance, and the front corner limb of the horizontal secondary beam is opened to avoid interference; T5, creating the edge beam front wing plate; T501, creating the edge beam front wing plate part; T502, creating the other side edge beam front wing plate symmetrically; T6, creating the panel bottom edge reinforcement plate; T7, creating the upper main cross beam part; T701, creating the main cross beam part; T702, editing the main cross beam part; The main cross beam is a variable cross section beam, and is created in the maximum shape; the part drawing is modified by cutting off the unwanted part first; a. Cutting of the end of the main cross beam: b. Creation of the inclined wing plate of the main cross beam; c. Creation of the connecting hole of the rear wing plate of the main cross beam; T8, creating the lower main cross beam part; In the "Assembly" block of the welding component environment, click the "Array" command, the "Array" dialog box pops up, select the upper main cross beam as the array part, click the "Circular" array button of the dialog box, select the axis of the door leaf as the center line, input the angle corresponding to the arc length between the upper and lower main cross beams + the welding shrinkage, and click the "OK" button, the lower main cross beam part is created; T9, check whether the door leaf horizontal beam system and the vertical beam system interfere with each other; On the "Inspection" block of the secondary menu bar of the welding component environment, click the "Interference Check" command, select the "Define Selection Set 1" button to click the horizontal beam system, select the "Define Selection Set 2" button to click the vertical beam system, and then click the "OK" button in the "Interference Check" dialog box that pops up. The software automatically checks the number, volume and red interference area of the interference; according to the prompt, return to the part environment for modification and improvement; T10, creating the door leaf panel; In step A5, the following steps are included: V1, creating a door leaf assembly drawing; V2, creating an Auto CAD drawing of the door leaf assembly; In the secondary menu bar of the welding component environment, click the "File" drop-down menu, select the "Export" command, and directly convert the drawn door leaf assembly model into an Auto CAD ".dwg" perspective drawing, photo and three-dimensional PDF; In step V1, the following steps are included: V101, importing the door leaf assembly model into the drawing: creating a drawing and importing the door leaf assembly model; V102, creating a left view of the door leaf; V103, creating a door leaf middle partition beam sectional view; V104, editing the labeled graphics; The "Dimension" command labels the included angle between the upper and lower main cross beams, the included angle between the top beam and the horizontal secondary beam, and the included angle between the bottom beam and the lower main cross beam, and generates the center line of the main cross beam section and the center line of the horizontal secondary beam section; V105, inserting a parts list and leading out a part serial number: "Export BOM table" is named as the parts list, and the door leaf assembly drawing and the door leaf assembly model are saved in the same folder.

Images