A method for accurate production and assembly of inclined support arms of arc gates guided by three-dimensional modeling and lofting

Abstract

The invention discloses a method for accurately manufacturing and assembling an oblique support arm of an arc gate by three-dimensional modeling and lofting, comprising the following steps: S1: creating an upper arm column component; S2: assembling the upper and lower arm columns; creating a lower arm column, an upper arm column positioning block and a lower arm column positioning block to ensure that the assembly position is correct; S3: creating an oblique support arm assembly model; opening the upper and lower arm column assembly model again, suppressing the assembly platform positioning block parts therein, and saving them as an oblique support arm assembly; S4: creating an engineering drawing and an Auto CAD drawing of the three-dimensional model; S5: editing a file using Auto CAD software drawings; the method for accurately manufacturing and assembling an oblique support arm of an arc gate by three-dimensional modeling and lofting can ensure the accuracy of the size and shape of the parts, and at the same time, unnecessary adjustment and correction are not required during the assembly process, thereby reducing labor intensity, and the three-model files are easy for workers to understand, thereby reducing unnecessary errors in the manufacturing process and improving manufacturing efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic metal structure manufacturing, and in particular to a method for accurately manufacturing and assembling an inclined support arm of an arc gate guided by three-dimensional modeling and lofting. Background Art

[0002] The inclined support arm is an important component of the radial gate, and its manufacturing quality directly affects the stress stability and safe operation of the radial gate. The inclined support arm consists of upper and lower arm columns, front and rear end plates, transverse oblique support rods, inner and outer cover plates of the trousers and stiffening plates. The front end is horizontally connected to the main crossbeam of the radial gate, and the rear end is coaxially installed on the hydraulic structure through a support hinge device. The inclined support arm is a three-dimensional structure. The angle 2θ between the upper and lower arm columns, the horizontal deflection angle α of the inclined support arm, and the torsion angle φ formed on the vertical section of the bisector of the angle between the two arm columns are the three main angles that make up the structural shape. The manufacturing process mainly relies on the size and shape of the parts and the control of the assembly position.

[0003] The manufacturing method of the prior art is as follows: ① According to the CAD drawings provided by the design unit, the parts drawings are drawn in the CAD software with the welding shrinkage, processing allowance, and assembly and alignment allowance for cutting, and the upper and lower arm columns, the horizontal oblique support rods, etc. are made into parts. ② Taking the axis plane of the upper and lower arm columns of the oblique support arm as the reference plane, the axis of the upper and lower arm columns and the angle bisector, the center line and front position line of the upper and lower wing plates of the arm column, the rear plate position line, the support hinge center point, etc. are placed on the assembly platform. ③ The upper and lower arm column components are placed in the corresponding positions, the center line of the lower wing plate is aligned with the center line of the ground sample, and the front and rear ends are aligned with the position line; the jack adjusts the angle of the upper and lower arm columns, and the hanging plumb line aligns the center line of the upper wing plate with the center line of the upper wing plate of the ground sample, which is the torsion angle adjustment of the oblique support arm; when the torsion angle is adjusted correctly, the center span of the two lower wing plates of the upper and lower arm columns and the center span of the two upper wing plates are equal in chord length at the front opening. Thereby realizing the horizontal connection with the main beam of the arc door leaf. ④After the upper and lower arm columns are adjusted and fixed, the actual size and shape of the horizontal oblique support rods, inner and outer covers of the pants and stiffening plates are measured, and then cut and corrected, and then assembled to the corresponding position for spot welding. ⑤After the overall assembly is completed, welding is carried out according to the welding process and sequence, and the oblique support arm is manufactured.

[0004] From the above content, it can be seen that the existing oblique support arm manufacturing technology is: to use CAD software to draw a parts drawing according to the size and angle of the design drawing for cutting, and then assemble the sheet materials into parts; put the ground sample line of the oblique support arm on the assembly platform, hang the prepared upper and lower arm columns on the corresponding positions of the ground sample line, and adjust the torsion angle of the upper and lower arm columns through the ground sample line, the hanging line plumb line and size detection; after it is suitable, according to the actual position of the upper and lower arm columns, correct the size and shape of the horizontal oblique support rod, the inner and outer cover plates of the trousers and other components, thereby completing the overall assembly process of the oblique support arm.

[0005] The prior art assembles by the above method, but there is a large detection error, which leads to unnecessary adjustments and corrections in the later stage, and the assembly process is time-consuming, affecting the production efficiency and inconvenience in use. Summary of the invention

[0006] The purpose of the present invention is to solve the above-mentioned problems and provide a method for accurately manufacturing and assembling the inclined support arms of arc gates by three-dimensional modeling and lofting, which can ensure the accuracy of the size and shape of parts, and at the same time eliminate unnecessary adjustments and corrections during the assembly process, thereby reducing labor intensity. The three-model files are easy for workers to understand, reducing unnecessary errors in the manufacturing process and improving production efficiency.

[0007] To achieve the above-mentioned purpose, the technical solution of the present invention is: a method for precise production and assembly of an arc gate oblique support arm guided by 3D modeling and lofting, comprising the following steps: S1: creation of upper arm column component; creating a new sketch on the xy plane to draw the side view of the oblique support arm design drawing, drawing the center line of the lower arm column with the arc gate design radius, positioning the right end at the original coordinate point, constraining the position to be a horizontal line, drawing the front and rear plane straight lines of the front end plate of the support arm perpendicular to the center line of the lower arm column, and constraining the position to be equal to the distance from the left end point of the center line to the outer edge of the arc gate panel to the rear end face of the main beam; S2: assembly of upper and lower arm columns; creating lower arm column, upper arm column positioning blocks and lower arm column positioning blocks to ensure the correct assembly position; S3: creating an oblique support arm assembly model; opening the upper and lower arm column assembly model again, suppressing the assembly platform positioning block parts therein, and saving them as an oblique support arm assembly; S4: creating engineering drawings and Auto CAD drawings of the 3D model; in Autodesk In the assembly environment interface of inventor software, click the first-level menu "New File" and select the "Standard.idw" template to create an engineering drawing, enter the engineering drawing environment, select the oblique arm assembly model and call it in; select "Custom View Direction" for the view direction, create the main view, top view, left view, and cross-bracing rod section view, and then edit and annotate them, insert the parts list and bring out the part number; S5: Auto CAD software drawing editing file; edit and simplify the graphics according to the process requirements, and add welding shrinkage and machining allowance to the width and length dimensions when cutting materials on the CNC cutting machine, and modify the size and shape of the graphics, delete the annotated dimensions and other unnecessary line segment graphics, and arrange the materials reasonably according to the specifications of the steel plate, and input the CNC cutting machine control system to cut out the part shape.

[0008] Preferably, the step S1 also includes the following steps: S1.01: Use Autodesk inventor software to create a two-dimensional sketch of the oblique support arm on the side wall plane; S1.02: Create a plane sketch of the rear side of the front end plate of the upper arm column; S1.03: Create a vertical plane sketch of the support hinge center; S1.04: Create a three-dimensional sketch of the axis of the oblique support arm; S1.05: Create a two-dimensional sketch of the oblique support arm plane; S1.06: Create an auxiliary sketch of the cross-section of the upper arm column; S1.07: Create inner and outer wing plates of the upper arm column; S1.08: Create the front section and partition of the upper and lower webs of the upper arm column; S1.09: Create the rear section of the upper and lower webs of the upper arm column; S1.10: Establish the pre-assembly correction amount of the front end of the upper arm column.

[0009] Preferably, the step S2 includes the following steps: S2.1: call in the assembly drawing of the upper arm column; 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 assembly component, enter the welding assembly environment, and then click the "Place" button under the "Assembly" section of the second-level menu bar, select the upper arm column component created above and call it in; click the "Constraint" button, select the constraint type as "Surface Flush", and select the "YZ, XZ, XY" planes of the original coordinate system of the assembly environment to align them one by one with the original coordinate system planes of the upper arm column; S2.2: Create the lower arm column; highlight the established "2D sketch of the inclined arm plane and the vertical mid-surface of the inclined arm", click the "Plane" drop-down menu on the "Assembly" menu bar, select the "Angle of plane rotation around edge" button, select the "vertical mid-surface of the inclined arm" and rotate 90° around the "bisector of the upper and lower arm column axes" to obtain the upper and lower arm column bisector planes, that is, the inclined arm bisector plane; click the "Image" command on the "Assembly" menu bar, select the upper arm column as the image object and the inclined arm bisector plane as the image plane, create a new part named lower arm column and save it in the same folder, and the lower arm column is created; S2.3: Create the assembly platform positioning block, upper arm housing positioning block, and lower arm column positioning block. After completing the editing, return to the welding assembly environment and save it as the "upper and lower arm column assembly" model.

[0010] Preferably, the step S3 includes the following steps: S3.1: creating a transverse support rod; S3.2: creating a rear end plate of the oblique support arm; S3.3: creating an outer cover plate and an inner cover plate of the underpants; S3.4: clicking the "Merge" command on the "3D Model" menu bar, selecting the "upper arm column outer cover plate model" and the "lower arm column outer cover plate model" to combine them into one, so as to obtain a complete outer cover plate shape of the underpants, and automatically return to the welding assembly environment after completing the editing.

[0011] Preferably, in step S4, on the engineering drawing environment interface of Autodesk inventor software, select the "Annotate" button in the secondary menu bar to enter the dimension annotation section, select the "Dimension" command to annotate the angle between the upper and lower arm columns of the oblique support arm, the opening chord length of the oblique support arm, the torsion angle of the upper and lower arm columns of the rear end plate plane, etc., and annotate various control dimensions according to the measurement requirements; use Autodesk inventor software to open the parts saved in the oblique support arm folder respectively: upper arm column component, upper and lower arm column assembly model, transverse support rod, trousers outer cover plate, trousers inner cover plate, outer rib plate, inner rib plate, and oblique support arm rear end plate.

[0012] Preferably, in step S4, when creating the top view and the left view, click the "Projection View" button under the "Place View" section of the menu bar, select the main view, move downward to an appropriate position, click the left mouse button to locate it, and select "Create" from the right-click menu. The top view of the oblique arm is created, and the left view of the oblique arm is created in the same way; when creating the sectional view, click the "Section View" button under the "Place View" section of the menu bar, select the main view of the oblique arm, click a point at an appropriate position above the transverse support rod, move vertically downward to position, click the left mouse button to terminate the section line, then move vertically to the left or right to define the direction, click the right mouse button on the menu "Continue", click the left mouse button on the placement position "OK", and the sectional view of the transverse support rod is created; as needed, sectional views and local views of various parts of the assembly drawing can be created.

[0013] Preferably, in step S5, the shape ratio of the parts in the CAD drawing is 1:1.

[0014] Compared with the prior art, this method has the following beneficial effects: (1) Auto CAD software is used to simplify graphic editing, and welding shrinkage, machining allowance, etc. are added in the width and length directions to modify the blanking process diagram. After reasonable arrangement according to the steel plate specifications, the part size and shape can be directly cut out by inputting into the CNC cutting machine control system. The blanking programming process is reduced. The parts are blanked according to the shape and size of the assembly state, so the size and shape are more accurate, and the parts can be used directly without correction when assembling, thereby improving the production quality and efficiency; (2) The engineering drawings and Auto CAD graphics of the inclined support arm can be directly printed out as paper drawings to guide the production process. Taking the engineering drawings and Auto CAD graphics obtained from the upper and lower arm column assembly model as an example, because the upper and lower arm columns shown in the figure are directly the theoretical assembly positions, the size and shape of the positioning blocks are drawn on the simulation assembly platform; the positioning blocks are processed and set on the real assembly platform, and the ground sample lines of the center lines of the inner and outer wing plates of the upper and lower arm columns are placed on the real assembly platform; the upper and lower arm columns are placed on the assembly platform positioning blocks according to the ground sample lines, and the center distance of the upper and lower wing plates at both ends is checked to be consistent with the drawings, and the theoretical assembly state can be achieved. Unnecessary adjustments and corrections in the assembly process are reduced, thereby reducing the workload and labor intensity of the assembly process; (3) The three-dimensional model of the inclined support arm parts can be exported as a three-dimensional PDF file, and the angle and position can be rotated for all-round observation, which is used for technical briefing before manufacturing, making it easier for workers to understand the spatial three-dimensional structure of the inclined support arm and reducing unnecessary errors in the manufacturing process; (4) The "Detection" menu of the Autodesk inventor software can be used to measure the position, length, angle, distance, etc. of any part of the parts, guide the dimensional measurement and verification of the assembly process, etc., making quality control easier to achieve and ensure, thereby improving the manufacturing quality and inspection level of the inclined support arm. DETAILED DESCRIPTION

[0015] A method for accurately manufacturing and assembling an oblique arm of an arc gate guided by three-dimensional modeling and lofting, comprising the following steps: S1: creating an upper arm column component; creating a new sketch on the xy plane to draw a side view of the oblique arm design drawing, drawing the center line of the lower arm column with the arc gate design radius, positioning the right end at the original coordinate point, and constraining the position to be a horizontal line; drawing a straight line of the front and rear plane of the front end plate of the arm perpendicular to the center line of the lower arm column, and constraining the position to be equal to the distance from the left end point of the center line to the outer edge of the arc gate panel to the rear end face of the main beam; drawing an upper arm column center line of the same length as the center line of the lower arm column with the original coordinate point as the starting point, "coincidence constraint" at the intersection of the two arcs, drawing a straight line of the front and rear plane of the front end plate of the arm perpendicular to the center line of the upper arm column, and constraining the same distance to the left end point of the center line of the upper arm column. Marking the alignment length of the intersection of the center lines of the upper and lower arm columns and the front of the front end plate is equal to the opening chord length of the lofted oblique arm. Marking the angle between the center lines of the upper and lower arm columns is the lofting angle of the oblique arm projected on the plane of the side wall of the arc gate. Delete the two auxiliary arc lines, and the two-dimensional sketch of the oblique support arm on the side wall plane is completed; S2: Assemble the upper and lower arm columns; create the lower arm column, upper arm column positioning block and lower arm column positioning block to ensure the correct assembly position; S3: Create an oblique support arm assembly model; open the upper and lower arm column assembly model again, suppress the assembly platform positioning block parts, and save it as an oblique support arm assembly; S4: Create engineering drawings and Auto CAD drawings of the three-dimensional model; in the Autodesk inventor software assembly environment interface, click the first-level menu "New File" and select the "Standard.idw" template to create an engineering drawing, enter the engineering drawing environment, select the oblique support arm assembly model to call in; select "Custom View Direction" for the view direction, create the main view, top view, left view, and horizontal support rod section view, and then edit and annotate them, insert the parts list and bring out the part number; S5: Auto CAD software drawing editing file; edit and simplify the graphics according to process needs, add welding shrinkage and machining allowance to the width and length dimensions when cutting materials on the CNC cutting machine, modify the size and shape of the graphics, delete the marked dimensions and other unnecessary line graphics, and arrange the materials reasonably according to the steel plate specifications. Input the CNC cutting machine control system to cut out the part shape. The shape ratio of CAD parts is 1:1.

[0016] In the present invention, the step S1 also includes the following steps: S1.01: Use Autodesk inventor software to create a two-dimensional sketch of the oblique support arm on the side wall plane; S1.02: Create a sketch of the rear plane of the front end plate of the upper arm column; click the "Plane" drop-down menu on the "3D Model" section of the menu bar, select the "Plane Rotation Angle Around Edge" button, select the original coordinate XY plane to rotate 90° around the rear plane of the front end plate to obtain the rear plane of the front end plate, named the front end plate plane of the support arm. Create a new two-dimensional sketch on this plane, and project the intersection of the rear plane of the front end plate and the center line of the upper arm column. Draw a straight line of the width of the front end face of the upper arm column with this point as the center, constrained in a vertical position, and the length is equal to the design value. Complete the two-dimensional sketch for use; S1.03: Create a vertical plane sketch of the support hinge center; click the "Plane" drop-down menu on the "3D Model" section of the menu bar, select the "Offset from Plane" button, select the original coordinate XY plane to offset outward by a horizontal deflection distance of the oblique support arm to obtain the vertical plane of the support hinge center, named the vertical midplane of the support hinge. Create a new 2D sketch on this plane, project the intersection of the center lines of the upper and lower arm columns and the auxiliary lines of this point, and complete the 2D sketch. S1.04: Create a 3D sketch of the axis of the inclined support arm; click the "Create 3D Sketch" button on the "3D Model" section of the menu bar, and draw three 3D straight lines from the midpoint of the straight line behind the front end plate of the upper and lower arm columns, the intersection of the center lines of the upper and lower arm columns, to the center point of the support hinge to obtain the axis of the upper and lower arm columns of the inclined support arm, and complete the 3D sketch; S1.05: Create a 2D sketch of the inclined support arm plane; click the "Plane" drop-down menu on the "3D Model" section of the menu bar, select the "Two Coplanar Edges" button, select the upper and lower arm column axes to obtain the vertical plane of the inclined support arm, and name it the vertical midplane of the inclined support arm. Create a new 2D sketch on this plane, project the upper and lower arm column axes and intersect them at one point, draw a work point at the midpoint of the leftmost partition on the upper arm column axis for use; draw the bisector of the two axes and mark the angle; draw the cross-sectional rectangle of the rear end plate of the inclined support arm perpendicular to and symmetrical to the bisector, and the distance to the support hinge center is equal to the hinge design oblique height. Complete the 2D sketch, and the 3D wireframe of the inclined support arm is now created; S1.06: Create an auxiliary sketch of the upper arm column section; ① First create the upper arm column axis horizontal plane and sketch: click the "Plane" drop-down menu on the "3D Model" section of the menu bar, select the "Two Coplanar Edges" button, select the drawn upper arm column axis and support hinge axis to obtain the upper arm column horizontal plane, named the upper arm column horizontal plane. Create a new 2D sketch on this plane, project the upper arm column axis and the spare work point on the line, and draw a straight line of equal width of the upper arm column section with this point as the midpoint, constraining it to be perpendicular and symmetrical to the projection line of the upper arm column axis to complete the 2D sketch; ② Create an auxiliary sketch of the upper arm column section: click the "Plane" drop-down menu on the "3D Model" section of the menu bar, select the "Plane Rotation Angle Around Edge" button, select the upper arm column transverse plane around the upper arm column section width straight line, rotate 90° to obtain the upper arm column section plane, and name it the upper arm column section.Create a new 2D sketch on this plane, project the width straight line of the upper arm section and the upper working point, and draw a center line perpendicular to the width line through this point to obtain the vertical center line of the upper arm section. Draw the section lines of the upper arm web, wing plate, and partition symmetrically with the center line to complete the 2D sketch; S1.07: Establish the inner and outer wing plates of the upper arm; S1.08: Establish the upper and lower web front sections and partitions of the upper arm; S1.09: Establish the upper and lower web rear sections of the upper arm; Establish the upper and lower web rear sections of the upper arm: In the "3D Model" section of the menu bar, click the "Plane Rotation Angle Around Edge" button in the "Plane" drop-down menu, select the vertical middle surface of the oblique support arm around the inner side edge of the cross-section rectangle of the rear end plate of the oblique support arm, and rotate 90° to obtain the front plane of the rear end plate of the oblique support arm, named the rear end plane of the oblique support arm. Create a 2D sketch on the rear end surface of the upper and lower web front sections of the upper arm, project the upper and lower web end surface lines, and complete the 2D sketch. Click the "Stretch" button under the "3D Model" menu, select the upper and lower web end face sketches and stretch them to the rear end plane of the inclined support arm, and the upper and lower web rear sections of the upper arm column are created; S1.10: Establish the pre-assembly correction amount at the front end of the upper arm column; create a two-dimensional sketch on the front end plane of the upper arm column, project the upper and lower web end face lines, draw the inner and outer wing section lines, and complete the two-dimensional sketch. Click the "Stretch" button under the "3D Model" menu, select the web end face line and wing section line sketches and stretch them by 100mm to obtain the pre-assembly correction length of the front end of the upper arm column. The front end of the upper arm column has been lengthened by 100mm. At this point, the upper arm column component is created.

[0017] In the present invention, the step S2 includes the following steps: S2.1: call in the assembly drawing of the upper arm column; in the Autodesk Ventura software part environment interface, click the first-level menu "New File" and select the "Weldment.iam" template to create a new sheet metal assembly component, enter the welding assembly environment, and then click the "Place" button under the "Assembly" section of the second-level menu bar, select the upper arm column component created above and call it in; click the "Constraint" button, select the constraint type as "Surface Flush", and select the assembly environment original coordinate system "YZ, XZ, XY" planes to align one by one with the original coordinate system planes of the upper arm column; S2.2: Create the lower arm column; highlight the established "2D sketch of the inclined arm plane and the vertical mid-surface of the inclined arm", click the "Plane" drop-down menu on the "Assembly" menu bar, select the "Angle of plane rotation around edge" button, select the "vertical mid-surface of the inclined arm" and rotate 90° around the "bisector of the upper and lower arm column axes" to obtain the upper and lower arm column bisector planes, that is, the inclined arm bisector plane; click the "Image" command on the "Assembly" menu bar, select the upper arm column as the image object and the inclined arm bisector plane as the image plane, create a new part named lower arm column and save it in the same folder, and the lower arm column is created; S2.3: Create the assembly platform positioning block, upper arm housing positioning block, and lower arm column positioning block. After completing the editing, return to the welding assembly environment and save it as the "upper and lower arm column assembly" model.

[0018] In the present invention, the step S3 includes the following steps: S3.1: creating a transverse support rod; S3.2: creating a rear end plate of the oblique support arm; S3.3: creating an outer cover plate and an inner cover plate of the underpants; S3.4: clicking the "Merge" command on the "3D Model" menu bar, selecting the "upper arm column outer cover plate model" and the "lower arm column outer cover plate model" to combine them into one, and the complete outer cover plate shape of the underpants can be obtained, and the editing will automatically return to the welding assembly environment after completion.

[0019] In the step S4, on the engineering drawing environment interface of the Autodesk inventor software, the "Annotation" button is selected in the secondary menu bar to enter the dimension annotation section, and the "Dimension" command is selected to annotate the angle between the upper and lower arm columns of the oblique support arm, the opening chord length of the oblique support arm, the torsion angle of the upper and lower arm columns of the rear end plate plane, etc., and various control dimensions are annotated according to the measurement requirements; the Autodesk inventor software is used to open the parts saved in the oblique support arm folder respectively: the upper arm column component, the upper and lower arm column assembly model, the transverse support rod, the outer cover plate of the trousers, the inner cover plate of the trousers, the outer rib plate, the inner rib plate, and the rear end plate of the oblique support arm.

[0020] In the present invention, in step S4, when creating a top view and a left view, click the "Projection View" button under the "Place View" section of the menu bar, select the main view, move downward to an appropriate position, click the left mouse button to locate it, and select "Create" from the right-click menu. The top view of the oblique arm is created, and the left view of the oblique arm is created by the same operation; when creating a sectional view, click the "Section View" button under the "Place View" section of the menu bar, select the main view of the oblique arm, click a point at an appropriate position above the transverse support rod, move vertically downward to position, click the left mouse button to terminate the section line, then move vertically to the left or right to define the direction, click the right mouse button on the menu "Continue", click the left mouse button on the placement position "OK", and the sectional view of the transverse support rod is created; as needed, sectional views and local views of various parts of the assembly drawing can be created.

[0021] The present invention is based on the three-dimensional modeling and lofting of Autodesk Inventor Professional 2018 software, and completes the editing and simplification of the component drawings in AutoCAD 2018 software; the implementation process includes the following steps:

[0022] 1. Create the upper arm column component; first create the 3D wireframe of the inclined arm, then create the upper arm column model, and then create the engineering drawing and Auto CAD drawing of the upper arm column part.

[0023] 2. Assemble the upper and lower arm columns; first, transfer the upper arm column components into the assembly environment of the Autodesk inventor software, constrain them in the assembly coordinate system, and mirror the lower arm column with the "oblique arm bisector plane", and the assembly relationship between the two is symmetrical; then, offset the "oblique arm vertical midplane" downward by a certain distance to obtain a virtual platform surface, project the upper and lower wing plate edges of the upper and lower arm columns on this plane to draw the center line of the upper and lower wing plates, and divide the layout position of the positioning block along the oblique arm bisector line by the construction line. The cross-sectional rectangle of the positioning block is symmetrical with the center line of the lower wing plate of the upper and lower arm columns. All positioning blocks are created by stretching and arraying; finally, the positioning blocks are manufactured according to the "assembly platform positioning blocks", and installed and fixed on the actual assembly platform, and the ground sample line of the center line of the upper and lower wing plates of the upper and lower arm columns is released, and the upper and lower arm columns of the oblique arm can be assembled. Divide the center line of the surface on the manufactured upper and lower arm column wing plates, and punch sample punching points of the center line at both ends of the wing plates, and hang them on the upper plane of the positioning block; align the center line of the lower wing plates of the upper and lower arm columns with the ground sample line, check that the span of the upper and lower wing plates at the front and rear ends is consistent with the theoretical value to ensure the torsion angle of the oblique support arm and complete the assembly.

[0024] 3. Assembly of the oblique support arm; first, draw the axis of the transverse support rod, draw the cross-section of the transverse support rod on the plane perpendicular to the axis, select the upper wing section of the cross-section, and stretch it between the inner sides of the upper and lower arm column upper wing plates to generate the upper wing of the transverse support rod; on the same plane, create a new sketch, project the lower wing section rectangle of the cross-section of the transverse support rod to complete the sketch, select the lower wing section of the new sketch again, and stretch it between the inner sides of the lower wing of the upper and lower arm columns to generate the lower wing of the transverse support rod; the left and right webs of the transverse support rod can be created with one sketch, and stretched between the inner sides of the upper and lower arm column webs; then, the inner and outer cover plates of the pants are respectively arranged on the inner plane and outer plane of the upper and lower arm column webs (planes on the thickness of the webs). Because of the existence of the torsion angle, there is an angle between the two inner and outer planes, so they need to be created separately in steps and then combined into one.

[0025] 4. Then, the outer rib plate and the inner rib plate are created. The inner rib plate is supported between the inner wing plates of the upper and lower arm columns, and the outer rib plate is supported between the outer wing plates of the upper and lower arm columns. The right ends are connected to the inner and outer covers of the trousers. Therefore, planes are created on the two sides of the upper and lower arm column wing plates near the web, and the plate thickness is stretched to generate. At this point, the oblique arm assembly model is created, and six part models are generated at the same time, including the transverse support rod of the oblique arm assembly state, the rear end plate of the oblique arm, the outer cover plate of the trousers, the inner cover plate of the trousers, the outer rib plate, and the inner rib plate.

[0026] 5. Application of the assembly state part drawing of the oblique support arm; the parts are manufactured in the size and shape of the assembly state, which makes it easier to achieve and guarantee the assembly manufacturing quality of the overall parts of the oblique support arm. The following is an example of the outer cover of the trousers. The outer cover of the trousers is symmetrical along the bisecting plane of the oblique support arm, and the two surfaces are 177.06014°. The chord length of the upper side of the inner surface is 956.22mm, and the chord length of the lower side is 900mm. It is a trapezoid with an oblique angle on the upper side. When making, delete the upper half of the right view of the CAD drawing, and use the lower half of the figure (reflecting the real shape) to symmetric the upper half of the figure along the center line to form a complete blanking process drawing. After cutting with a CNC cutting machine, the production process uses a bending machine to bend and form. Bend the other half with the center line aligned, bend the surface 2.93986°, and slowly increase the angle three times. After each bending, measure the length of the upper and lower chords on the inner surface. When the theoretical value is reached, the bending angle is reached. After the internal stress is released, check again, and bend again if necessary to achieve the illustrated size. When the outer cover plate of the trousers manufactured in the size and shape of the assembly state is assembled with the oblique support arm, no gap will be generated, thereby reducing deformation during the welding process and achieving the goal of precise manufacturing of the oblique support arm.

[0027] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A method for accurately manufacturing and assembling the inclined support arm of an arc gate by three-dimensional modeling and lofting, characterized in that: The following steps are included: S1: Create the upper arm column component; create a new sketch on the xy plane to draw the side view of the oblique arm design drawing, draw the center line of the lower arm column with the arc door design radius, position the right end at the original coordinate point, and constrain the position to a horizontal line. Draw the front and rear plane straight lines of the front end plate of the arm perpendicular to the center line of the lower arm column, and constrain the position to be equal to the distance from the left end point of the center line to the outer edge of the arc door panel to the rear end face of the main beam; S2: Assemble the upper and lower arm columns; create the lower arm column, upper arm column positioning block and lower arm column positioning block to ensure the correct assembly position; S3: Create an oblique arm assembly model; open the upper and lower arm column assembly model again, suppress the assembly platform positioning block parts, and save it as an oblique arm assembly; S4: Create a three-dimensional model engineering drawing and Auto CAD drawing; in the Autodesk Inventor software assembly environment interface, click the first-level menu "New File" and select the "Standard.idw" template to create an engineering drawing, enter the engineering drawing environment, select the oblique arm assembly model to call in; select "Custom View Direction" for the view direction, create the main view, top view, left view, and cross-bracing rod section view, and then edit and annotate them, insert the parts list and bring out the part number; S5: Auto CAD software drawing editing file; edit and simplify the graphics according to process requirements, and add welding shrinkage and machining allowance to the width and length dimensions when cutting materials on the CNC cutting machine, and modify the size and shape of the graphics, delete the annotated dimensions, and arrange the materials reasonably according to the steel plate specifications. Input the CNC cutting machine control system to cut out the part shape; the step S2 includes the following steps: S2.1: Call in the assembly drawing of the upper arm column; in Autodesk In the Inventor software part environment interface, click the first-level menu "New File" and select the "Weldment.iam" template to create a new sheet metal assembly component, enter the welding assembly environment, then click the "Place" button under the "Assembly" section of the second-level menu bar, select the upper arm column component created above and call it in; click the "Constraint" button, select the constraint type as "Surface Flush", and select the original coordinate system "YZ, XZ, XY" planes of the assembly environment to align them one by one with the original coordinate system planes of the upper arm column; S2.2: Create the lower arm column; highlight the "2D sketch of the inclined arm plane and the vertical mid-surface of the inclined arm", click the "Plane" drop-down menu on the "Assembly" menu bar, select the "Angle of plane rotation around edge" button, select the "Vertical mid-surface of the inclined arm" and rotate 90° around the "bisector of the upper and lower arm column axes" to obtain the upper and lower arm column bisector planes, that is, the inclined arm bisector plane; click the "Image" command on the "Assembly" menu bar, select the upper arm column as the image object and the inclined arm bisector plane as the image plane, create a new part named lower arm column and save it in the same folder, and the lower arm column is created; S2.3: Create the assembly platform positioning block, upper arm column positioning block, and lower arm column positioning block. After completing the editing, return to the welding assembly environment and save it as the "Upper and Lower Arm Column Assembly" model.

2. The method for accurately manufacturing and assembling the inclined support arm of an arc gate guided by three-dimensional modeling and lofting according to claim 1 is characterized in that: The step S1 also includes the following steps: S1.01: Use Autodesk inventor software to create a two-dimensional sketch of the oblique support arm on the side wall plane; S1.02: Create a plane sketch of the rear side of the front end plate of the upper arm column; S1.03: Create a vertical plane sketch of the support hinge center; S1.04: Create a three-dimensional sketch of the axis of the oblique support arm; S1.05: Create a two-dimensional sketch of the oblique support arm plane; click the "Plane" drop-down menu on the "3D Model" section of the menu bar, select the "Two Coplanar Edges" button, select the upper and lower arm column axes to obtain the vertical plane of the oblique support arm, and name it the vertical midplane of the oblique support arm; S1.06: Create an auxiliary sketch of the upper arm column section; S1.07: Create inner and outer wing plates of the upper arm column; S1.08: Create the front section and partition of the upper and lower webs of the upper arm column; S1.09: Create the rear section of the upper and lower webs of the upper arm column; S1.10: Establish the pre-assembly correction amount at the front end of the upper arm column.

3. The method for accurate production and assembly of the inclined support arm of an arc gate guided by three-dimensional modeling and lofting according to claim 2 is characterized in that: The step S3 includes the following steps: S3.1: creating a transverse support rod; S3.2: creating a rear end plate of the oblique support arm; S3.3: creating an outer cover plate and an inner cover plate of the pants; S3.4: clicking the "Merge" command on the "3D Model" menu bar, selecting the "upper arm column outer cover plate model" and the "lower arm column outer cover plate model" to combine them into one, and the complete outer cover plate shape of the pants can be obtained. After completing the editing, it will automatically return to the welding assembly environment.

4. The method for accurate production and assembly of the inclined support arm of an arc gate guided by three-dimensional modeling and lofting according to claim 3 is characterized in that: In the step S4, on the engineering drawing environment interface of the Autodesk inventor software, select the "Annotation" button in the secondary menu bar to enter the dimension annotation section, select the "Dimension" command to annotate the angle between the upper and lower arm columns of the oblique support arm, the opening chord length of the oblique support arm, and the torsion angle of the upper and lower arm columns of the rear end plate plane, and annotate various control dimensions according to the measurement requirements; use the Autodesk inventor software to open the parts saved in the oblique support arm folder respectively: the upper arm column component, the upper and lower arm column assembly model, the transverse support rod, the outer cover plate of the trousers, the inner cover plate of the trousers, the outer rib plate, the inner rib plate, and the rear end plate of the oblique support arm.

5. The method for accurate production and assembly of the inclined support arm of an arc gate guided by three-dimensional modeling and lofting according to claim 4 is characterized in that: In the step S4, when creating the top view and the left view, click the "Projection View" button under the "Place View" section of the menu bar, select the main view, move downward to an appropriate position, click the left mouse button to locate it, and select "Create" from the right-click menu. The top view of the oblique support arm is created, and the left view of the oblique support arm is created in the same way; when creating the sectional view, click the "Section View" button under the "Place View" section of the menu bar, select the main view of the oblique support arm, click a point at an appropriate position above the transverse support rod, move vertically downward to position, click the left mouse button to terminate the section line, then move vertically to the left or right to define the direction, click the right mouse button on the menu "Continue", click the left mouse button on the placement position "OK", and the sectional view of the transverse support rod is created; as needed, sectional views and local views of various parts of the assembly drawing can be created.

6. The method for accurate production and assembly of the inclined support arm of an arc gate guided by three-dimensional modeling and lofting according to claim 5 is characterized in that: In step S5, the shape ratio of the parts in the CAD drawing is 1:1.