CN107977529B

CN107977529B - Weldment modeling method based on three-dimensional software

Info

Publication number: CN107977529B
Application number: CN201711369817.6A
Authority: CN
Inventors: 许彦平; 于丕杰
Original assignee: Liaoning Censcience Industry Co Ltd
Current assignee: Liaoning Censcience Industry Co Ltd
Priority date: 2017-12-18
Filing date: 2017-12-18
Publication date: 2021-11-23
Anticipated expiration: 2037-12-18
Also published as: CN107977529A

Abstract

The invention provides a weldment modeling method based on three-dimensional software, which belongs to the field of welding modeling and comprises the following steps: drawing the finished weldment into a part in three-dimensional software; the second step is that: establishing a dividing surface, dividing the integral part into splicing parts with different sizes by adopting a dividing method, and chamfering the joint of each cut splicing part; the third step: the part finished in the second step is stored in an editable general format which can be opened by various three-dimensional software; the fourth step: and adopting three-dimensional software to reopen the file generated in the third step to generate a plurality of characteristics, wherein each characteristic corresponds to an independent spliced part in the second step, and each characteristic is stored as an independent part map. The invention saves the design time, improves the working efficiency and can ensure that the accuracy of the size of each disassembled welding part is 100 percent.

Description

Weldment modeling method based on three-dimensional software

Technical Field

The invention belongs to the field of weldment modeling, and relates to a three-dimensional software-based weldment modeling method.

Background

At present, most of the large-diameter slurry shield machines are in a normal-pressure tool changing mode, and a cutter disc body is designed into a box beam with a hollow structure according to process requirements. The connection between the spokes and the base is mostly of a through structure, if three-dimensional software is adopted to model each part according to a traditional design method, then assembly and assembly are carried out, because each part has a plurality of intersecting lines and is not on the same plane, a plurality of three-dimensional sketches or auxiliary reference surfaces need to be established in the drawing process, the requirement on the modeling capacity of a designer is higher, and a plurality of space curves cannot be drawn accurately, so that the working efficiency is very low, and the correct size of each part is difficult to ensure.

Disclosure of Invention

The invention aims to solve the problem of providing a three-dimensional software-based weldment modeling method, saving design time, improving working efficiency and ensuring that the accuracy of the size of each disassembled welding part is 100%.

In order to solve the technical problems, the invention adopts the technical scheme that: a weldment modeling method based on three-dimensional software comprises the following steps: drawing the finished weldment into a part in three-dimensional software;

the second step is that: establishing a dividing surface, dividing the integral part into splicing parts with different sizes by adopting a dividing method, and chamfering the joint of each cut splicing part;

the third step: the part finished in the second step is stored in an editable general format which can be opened by various three-dimensional software;

the fourth step: and adopting three-dimensional software to reopen the file generated in the third step to generate a plurality of characteristics, wherein each characteristic corresponds to an independent spliced part in the second step, and each characteristic is stored as an independent part map.

Further, in the second step, establishing the dividing plane is based on the principle that the divided parts are convenient to manufacture.

Further, the common format in the third step is x _ t, stp or igs format.

Further, in the fourth step, if an independent part is to be generated, all other features may be deleted, and then an independent file is saved, and then the file is renamed, and the generation manner of other parts is the same.

Further, in the first step, the main body part of the finished weldment may be drawn, and then after the second step is completed, other part features may be drawn without merging the features.

Further, in the first step, the welding finished product is a shield machine cutter head body, a cutter head body flange and a base three-dimensional model are firstly established, then a box body three-dimensional model of spokes except the cutter head body flange and the base three-dimensional model is established, the spoke box body model is inserted into the base model part, the spoke box body model is restrained and positioned according to the size of the finished product, and then the spoke box body model and the base model part are combined into a whole by a Boolean operation method.

Further, the shell is integrally drawn on the basis of the sixth step, and the thickness of the drawn shell is divided according to the thickness of the plate.

Compared with the prior art, the invention has the advantages and positive effects that: 1. according to the method, reverse thinking is adopted, the whole is drawn firstly, then the parts are divided to form independent parts, the size precision of each split part can be guaranteed, the parts can be manufactured according to the size of the split parts, the assembly size is qualified, and the problem of low drawing efficiency of the forward thinking is solved; 2. the scheme can use various three-dimensional software such as SolidWorks, UG, RRO/E or INEWENTOR and the like, has wide application range, is particularly suitable for SolidWorks software, and solves the problem that the SolidWorks software is not suitable for manufacturing large box beams.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the construction of the base and cutterhead flange body combination of the present invention;

FIG. 2 is a schematic view of a model of a spoke housing of the present invention;

fig. 3 is a schematic structural view after the combination of fig. 1 and fig. 2 and the shell extraction.

Reference numerals:

1-a base; 2-a cutter head flange; 3-spoke box model; 4-reference plane.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the purpose of convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or both elements may be interconnected. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The following detailed description of specific embodiments of the invention refers to the accompanying drawings.

As shown in fig. 1 and 2, the invention relates to a three-dimensional software-based weldment modeling method, which comprises the following steps: the finished weldment is drawn into a part in three-dimensional software, a plurality of parts are circular symmetrical parts, the steps of scanning, rotating and the like can be adopted in the three-dimensional software for drawing, the drawing is convenient, if a plurality of space curves exist after the drawing is divided, a plurality of base surfaces and sketches need to be established in the drawing process, the drawing is not accurate enough, and the subsequent assembly accuracy is influenced;

the second step is that: establishing a dividing plane, dividing the integral part into splicing parts with different sizes by adopting a dividing method, chamfering the joint of each divided splicing part, and further, in the second step, establishing the dividing plane on the principle that the divided parts are convenient to manufacture, establishing a sketch first, drawing a sketch line and establishing a reference plane for dividing by taking the sketch line as the reference when establishing the dividing plane;

Furthermore, the general format in the third step is x _ t, stp or igs format, preferably x _ t format, and the x-t format is a solid format at an opening, so that the subsequent further editing of the individual parts is facilitated.

The method can ensure that the precision of each part is 100% after disassembly, is suitable for a cutter head body structure of a shield machine and a large box beam structure, greatly improves the working efficiency and ensures the correctness of the disassembly of the weldment.

Example 1:

the modeling process of all parts of the shield machine cutter disc body weldment is as follows:

1. designing the whole cutter head body into a part, as shown in figure 1, firstly establishing a three-dimensional model of a cutter head body flange 2 and a base 1;

2. as shown in fig. 2, a box model of the spoke is additionally established except for the three-dimensional model of the cutter head flange and the base; inserting the spoke box body model into the base model part, restraining and positioning the spoke box body model, and then combining the spoke box body model and the base model part into a whole by using a Boolean operation method;

3. as shown in fig. 3, different surfaces are selected according to design requirements to integrally draw the shell, and the thickness of the shell is divided according to the thickness of the plate;

4. establishing a separating surface 4, and dividing the integral part into splicing parts with different sizes by adopting a dividing method, wherein the integral part is still an integral part, but the dividing line on the part body is more obvious;

5. stretching and the like are continuously established at different positions of the model, so that secondary welding parts on the cutter head body are completed, but the welded parts are not parts at present, and the main characteristic is that the new characteristic establishment does not need to merge results, so that intersecting lines are generated among the characteristics;

6. after finishing all the characteristics, chamfering each cut characteristic by adopting an 'isolated' method so as to form the groove size required by connection;

7. after the task is finished, the parts are stored, and the welding drawing of the whole cutter head body is finished;

8. generating a part diagram, storing the file in the step 7 as a file with an extension name of x _ t, then opening the x _ t file, finding that all the characteristics are input 1 and input 2 at this time, … … till inputting N, finishing the importing of all the parts, then disassembling the parts into N tailor-welded parts according to requirements, for example, the input 1 is a part, deleting all the other inputs by adopting a reverse selection method, then storing another part, and so on, and generating all the independent parts;

9. and (5) finishing the design of all the part drawings on the basis of the supplement of the 8 th step, and then carrying out drawing work of subsequent engineering drawings.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims

1. The weldment modeling method based on the three-dimensional software is characterized by comprising the following steps of:

1. the first step is as follows: drawing a finished weldment into a part in three-dimensional software, drawing the main part of the finished weldment in the first step, then drawing other part characteristics on the premise of not combining the characteristics after the second step is finished, establishing a three-dimensional model of a cutter head flange and a base, then establishing a three-dimensional model of a box body of spokes except the cutter head flange and the three-dimensional model of the base, inserting the spoke box body model into the base model part, constraining and positioning according to the size of the finished product, and then integrating the parts into a whole by using a Boolean operation method;

2. The three-dimensional software based weldment modeling method of claim 1, wherein: in the second step, the establishment of the dividing surface is based on the principle that the divided parts are convenient to manufacture.

3. The three-dimensional software based weldment modeling method of claim 1, wherein: the general format in the third step is x _ t, stp or igs format.

4. The three-dimensional software based weldment modeling method of claim 1, wherein: in the fourth step, if an independent part is to be generated, all other features can be deleted, then the part is saved as an independent file, and then the part is renamed, and the generation modes of other parts are the same.

5. The three-dimensional software based weldment modeling method of claim 1, wherein: and (5) integrally drawing the shell on the basis of the sixth step, wherein the thickness of the drawn shell is divided according to the thickness of the plate.