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The most popular Proengineer in communication prod

2022-08-06

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The application of pro/engineer in the structure design of communication products

[Abstract] taking the design of parametric standard plug-in box as an example, this paper discusses in detail the application of pro/engineer in the parametric structure design

[Key words] pro/engineer plug-in box structure design

with the rapid development of science and technology and the intensification of market competition of communication products, major telecom operators have put forward higher and stricter requirements for the appearance and quality of communication products. It not only requires beautiful appearance and high quality, but also requires shorter and shorter product R & D cycle. In order to meet the above requirements, only by adopting advanced design and manufacturing technology and using scientific management means, can the enterprise be in an invincible position in the fierce market competition. Since April2002, the process structure Department of a business division of the company has promoted the use of the three-dimensional entity design tool pro/engineer in the Department, and has successively applied the software to design and develop the structure of mobile positioning terminal system, alarm box, parameterized standard plug-in box, various cabinets and other communication products, and has made great achievements. Taking the design and development of parametric standard plug-in box as an example, the application of pro/engineer software in structural design is briefly discussed

1 design requirements

(1) the purpose of line parameterized standard plug-in box design is to greatly improve the work efficiency of subsequent designers

(2) the design dimension of the plug-in box shall be 19'and 24' of the standard

(3) the design requirements of all parts shall be in accordance with IEC 60297

(4) it is required that all parts including different beams, guide rails, side lugs, upper and lower plates, etc. can be freely replaced with each other

(5) it is required that the plug-in box size can only be changed within the standard range and according to the standard series, and each installation size shall not be changed at will

(6) EMC shall be considered in the design process

(7) distinguish borrowed and non borrowed items in the BOM

2 design analysis

it can be seen from the design requirements that the parametric standard plug-in box is designed to enable subsequent designers to complete the design of different types of plug-in boxes in a short time according to IEC 60297 standards, including the drawing of engineering drawings, while avoiding errors. In the actual application process, it is also required that the cross-section shapes of beams and side lugs can be freely replaced, that is, beams and side lugs of different shapes can be freely selected in assembly

the variable parameters in the design mainly include: the height of the plug-in box, the depth of the plug-in box, the width of the plug-in box, the number of slots and beams used for the plug-in box, etc. EMC, whether there are upper and lower plates and the ventilation mode of the plug-in box should be considered

3 design idea

combined with the characteristics of the software itself, it is proposed to adopt the top-down method for design, use layout to control the selection of parts, and use family in the design process_ Table, relation and program control the whole design process, and use interchange to replace parts

4 design steps

(1) establish the part file model of each part, such as beam, nut strip and side plate

(2) according to IEC 60297 standard, family_ The table form controls the overall dimensions of various parts

(3) create a layout file, use the layout file to control multiple files and make them related to each other, so as to facilitate parameter control

(4) create * asm、*. Skeleton file, in * In ASM files, skeleton is mainly used to control the assembly relationship of parts

(5) in * The skeleton file writes various relationships to control the relationship between various related parameters

(6) in * In ASM file, modify the assembly program, and realize the mutual call between parts through the use of interchange

(7) debugging, operation and modification

(8) produce engineering drawings and various template documents

5 detailed design

5.1 create a part file model

in the design process, according to IEC 60297 standards, the part file model of each part is established in the form of family table

5.1.1 front and rear crossbeams

for the front and rear crossbeams, it is necessary to control their length, the number of wrench stress holes, the position of the first pattern line, etc., while the specific section shape of the crossbeam can be designed later. Therefore, the parameters controlled in the family table are shown in Figure 1. Among them, D2 controls the length of the beam, d138 controls the position of the first installation pattern line, and p141 controls the number of patterns of wrench stress holes

Figure 1 parameters controlled by the front and rear crossbeams

5.1.2 side ears

obviously, for the side ears, the change of the plug-in box size will inevitably lead to the change of the section shape, height, installation hole spacing and position of the side ears, and the change of these dimensions is limited by the standards. Therefore, these parameters need to be controlled in the family table. As shown in Figure 2. Among them, D4 controls the height of the side ear, D1 controls the section size in the width direction of the side ear, and D10, D11 and D15 control the position and spacing of the mounting holes on the mounting surface of the side ear

Figure 2 parameters controlled by the side ear

5.1.3 side plate

for the side plate of the plug-in box, due to the influence of the plug-in box height (increased by multiple of u, 1u=44.45mm) and the plug-in box depth (increased by integral multiple of 60mm), there are more instances generated in the family table. As shown in Figure 3

Figure 3 parameters of side plate control

in this example, the depth of the side plate is mainly controlled by d0, and the height of the side plate is controlled by D2

using the same method, you can create part files of other parts, such as middle crossbeam, upper and lower plates, etc. When creating part files, in order to ensure the relevance of part features, relation should be added to the part files to control the relationship and existence of these features! For example, the characteristics of the mounting hole on the side ear are partially related as follows

VERSION

REVNUM 861

LISTING FOR GENERIC PART MOUNTING_ FLANGE

INPUT

END INPUT

RELATIONS

PWEIGHT=MP_ MASS("")

New_ Name=Lookup_ Inst ("mounting_t", 0, "D1", mounting_flange_width, "D4", H1)

d14=d15/2

end adjustments

this part of the relationship mainly controls: the positional relationship of the two mounting holes in the middle of the side ear and the selection of different side ear instance file names through the values of D1, D4 and H1 for file calls during assembly

IF D4>260

ADD FEATURE (initial number 7)

INTERNAL FEATURE ID 161

PARENTS = 5(#3) 39(#5)

CUT: Extrude

NO. ELEMENT NAME INFO STATUS

1 Attributes One Side Defined

2 Section Sk. plane - Surface of feat #5 (PROTRUSION) Defined

3 MaterialSide Inside section Defined

4 Direction Defined

5 Depth Through All Defined

SECTION NAME = S2D0001

FEATURE IS IN LAYER(S) :

02___ PRT_ ALL_ AXES - OPERATION = SHOWN

20_ ALL_ FEATURES - OPERATION = BLANKED

03_ ALL_ Axes - operation = show

feature's dimensions:

d14 = 38.1

d15 = 76.2

d16 = 10.3

d18 = 10.3

d19 = 13.5

d20 = 3.4r (weak)

end add

end if

this part of the relationship mainly controls the display of the middle two mounting holes on the side ear: when d4>260, the characteristics of the mounting holes are displayed, that is, there are four mounting holes on the side ear; Otherwise, in the middle 2, the automotive nonmetallic materials branch of the society of Automotive Engineers of China held an annual meeting in Harbin on November 28 (3) 0 with the theme of "lightweight, functionalization and environmental protection", i.e. only two upper and lower mounting holes are displayed on the side ears

5.2 interchange of all parts

the purpose of interchange of all parts is to ensure that in the assembly, all parts can be replaced with each other according to their own assembly benchmark without affecting the generation of the whole assembly

5.3 create layout file

layout file is the core file in the whole design process. It controls the features of all parts in the plug-in box assembly, such as the size of overall dimensions and the presence or absence of feature features; It also determines which part (instance in family table) is used for assembly

when the steel bar bending testing machine meets the design layout file of the new standard gb/t1499.2, it is usually divided into different pages, each page focuses on different contents, sets all variable parameters in the file, and expresses the meaning of the parameters with simple graphics, so as to facilitate subsequent designers to understand and use

in this design, the layout file is divided into five different pages: the first page is used to determine the type, height and depth of the plug-in box to be designed; The second page is used to determine whether the construction period is 18 months, the upper and lower shielding plates to be used, and the type and opening of shielding plates; The third page is used to determine whether the middle crossbeam and the cross-sectional shape of the front and rear crossbeams need to be added to the plug-in box; The fourth page is used to determine the type of side lug, side plate and guide rail of the plug-in box; The fifth page is used to determine the number of box guide rails, calculate and verify whether all data are correct and whether the data input is completed

as shown in Figure 4, it is the first page of the layout file, which mainly allows the designer to determine the type, height and depth of the plug-in box

because the layout file plays a central role in the whole design process, in this file, all parameters and variables encountered in the design should be controlled and innovated by using the relational expression and short C program, and the relationship between them should be set. Generally, in parametric design, the design of layout and the setting of the relationship between all parameters are the key points and difficulties in the design, and the key to the success or failure of parametric design

as shown below, the two cycle statements determine the type of plug-in box, the width of side ears and the type of front beam selected

HP=5.08

U=44.45

if Subcrack_ Type==1

mounting_ flange_ width=27.79

SUBCRACK_ WIDTH=431.8

else

if Subcrack_ Type==2

mounting_ flange_ width=25.25

SUBCRACK_ WIDTH=563.88

else

warning_ 0= "input error, please re-enter"

endif

if front_ Horizontal_ Type==0

NAME_ 01=Lookup_ Inst("Front_Horizontal_t"，0，"D2"，SUBCRACK_WIDTH)

Front_ Horizontal_ NAME=NAME_ 01

endif

Figure 4 layout file page 1

5.4 create a skeleton file

the so-called skeleton file is a skeleton file composed of points, lines, faces, etc., which can contain the feature information of all parts and the assembly information of all parts in the assembly. In the design of this example, to meet the needs of the design, the skeleton file only contains the assembly information of the part. As shown in Figure 5, in the actual design process, more datum planes and curves can be added as auxiliary positioning datum

Figure 5 can add more reference planes

5.5 establishment * ASM file

after the part file, layout file and skeleton file of each part are established, each part is assembled with the surface and line provided on the skeleton as a reference to form the assembly file of the plug-in box. The purpose of this process is to prevent accidental modification of the part mounting surface and assembly failure

Figure 6 plug-in box size

modify * The program in the ASM file ensures that when the layout changes, * ASM assembly file can find the part instance with the correct file name. The following is the revised pr