CN103258086B - A kind of frock stiffness analysis method - Google Patents
A kind of frock stiffness analysis method Download PDFInfo
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- CN103258086B CN103258086B CN201310152689.5A CN201310152689A CN103258086B CN 103258086 B CN103258086 B CN 103258086B CN 201310152689 A CN201310152689 A CN 201310152689A CN 103258086 B CN103258086 B CN 103258086B
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Abstract
The invention belongs to aviation assembly technology field, be specifically related to a kind of frock stiffness analysis method.Comprise feasibility modeling, use the frock analysis module of CATIA to carry out stiffness analysis to frock, analyze the part that the deflection exported finds out frock rigidity weakness, according to deflection analysis result, original model is modified until frock deflection is within the error range of allowable transformation.The main object of retention analysis of the present invention, by the removal such as position, hole and groove of accessory and correspondence thereof, and add the balance weight body of the regular shape weighed with accessory etc., the complexity marking off grid can be made like this to reduce, reduce calculation overflow and stop phenomenon, improve counting yield, in turn ensure that the rationality of abstract model, baroque frock can be made also to carry out analog computation.
Description
Technical field
The invention belongs to aviation assembly technology field, be specifically related to a kind of frock stiffness analysis method.
Background technology
At present, Fixture Design stage Main Basis experience in the past determines whether frock rigidity meets request for utilization, if after frock creates, find that the deformation effect that insufficient rigidity causes uses, mode again by reprocessing carries out reinforcement process to frock, so just cause a large amount of wastes on time and cost, the large-scale boring class frock of especially carrying out the aircraft assembled uses, this kind of frock has very high loss of weight requirement, be easy to because structure, material, selecting of use-pattern unreasonable etc. causes insufficient rigidity.Preferably just can analyze these contents in the design phase of frock, comparatively reasonably design proposal is selected by analog computation, but this kind of large-scale tool structure is general very complicated, and have a lot of additional structure, therefore can bring a lot of difficulty to modeling, such as simplify processes is bad can reduce counting yield, even causes calculation overflow to stop, the bad precision that can affect calculating of mesh quality divided, to the unreasonable actual conditions etc. that just cannot characterize frock of frock Model Abstraction.
Summary of the invention
Goal of the invention: a kind of procedure frock rigidity simulating analysis being easy to operate is provided, in the Fixture Design stage, just qualitative or quantitative test is carried out to frock rigidity, analysis result as the foundation instructing structure to improve, just can be checked out its rigidity before frock is gone into operation and whether can meet request for utilization.
Technical scheme: a kind of frock stiffness analysis method, based on the engineering analysis module of CATIA, comprises the following steps:
Step one, feasibility modeling:
1.1 remove non-essential parts in frock, and each position, hole then removing component stayed blocks, and increase the counterweight of regular shape, to reduce the complexity of stress and strain model at the position not affecting frock integral rigidity;
The part that can merge in 1.2 same assemblies carries out integrated treatment; The key component affecting rigidity takes out corresponding assembly constraint according to actual conditions;
1.3 save as .stp form, reduce unnecessary geometric properties;
1.4 load the boundary condition of frock and load-up condition and material according to the actual service condition of frock;
1.5 multiplex (MUX)s put into row stress and strain model: adopt Nonlinear Grid to divide frock, grid cell size is between 30mm ~ 10mm;
Step 2, the model using step one to obtain use the frock analysis module of CATIA to carry out stiffness analysis to frock, analyze the part that the deflection exported finds out frock rigidity weakness;
Step 3, foundation deflection analysis result are modified to original model;
Step 4, repetition step 2 and step 3, until frock deflection is within the error range of allowable transformation.
Beneficial effect: the main object of retention analysis of the present invention, by the removal such as position, hole and groove of accessory and correspondence thereof, and add the balance weight body of the regular shape weighed with accessory etc., the complexity marking off grid can be made like this to reduce, reduce calculation overflow and stop phenomenon, improve counting yield, in turn ensure that the rationality of abstract model, baroque frock can be made also to carry out analog computation.The frock processed is saved as .stp form, reduces unnecessary geometric properties, also can improve counting yield; The part that the present invention can merge carries out integrated treatment, reduces the stability that assembly constraint can improve calculating; The key component affecting rigidity then takes out corresponding assembly constraint according to actual conditions, so that simulate real screw, and pin connection etc.; The boundary condition loaded according to the actual service condition of frock and load-up condition and material, can ensure model authenticity.According to calculating experience to many cover frocks in the past, adopted Nonlinear Grid to divide frock, when grid cell size is between 30mm ~ 10mm, optimum efficiency can be obtained between analysis precision and computing time.The present invention can analyze the part of frock rigidity weakness according to the result that model calculates, instruct follow-up reinforcement design, simultaneously can as one of foundation of frock stiffness testing, the application of this method is very helpful for large-scale trial-production class Fixture Design.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
A kind of frock stiffness analysis method, based on the engineering analysis module of CATIA, comprises the following steps:
Step one, feasibility modeling:
1.1 remove non-essential parts in frock, and each position, hole then removing component stayed blocks, and increase the counterweight of regular shape, to reduce the complexity of stress and strain model at the position not affecting frock integral rigidity;
The part that can merge in 1.2 same assemblies carries out integrated treatment; The key component affecting rigidity takes out corresponding assembly constraint according to actual conditions;
1.3 save as .stp form, reduce unnecessary geometric properties;
1.4 load the boundary condition of frock and load-up condition and material according to the actual service condition of frock;
1.5 multiplex (MUX)s put into row stress and strain model: adopt Nonlinear Grid to divide frock, grid cell size is between 30mm ~ 10mm;
Step 2, the model using step one to obtain use the frock analysis module of CATIA to carry out stiffness analysis to frock, analyze the part that the deflection exported finds out frock rigidity weakness;
Step 3, foundation deflection analysis result are modified to original model;
Step 4, repetition step 2 and step 3, until frock deflection is within the error range of allowable transformation.
Embodiment:
Certain type machine left sliding gate erectility stiffness analysis: certain type machine left sliding gate erectility copies French tool structure, length and width reach 3000mmX1700mm, one Aluminum alloy frame casting is adopted to be main body first, require strict control weight and ensure bore position precision, this just limits distortion of frock within 0.1mm.In frock lifting installation process, can produce distortion compared with vulnerable area under stressed in structure, the position of each pin, keeper will change, and frock is installed and is affected.Framework locates, and keeper, compressing member, drill jig etc. be installed use, at this moment also need to check to ensure that bore position is accurate to key position deformations such as drill jigs.
Framework upper region is not almost out of shape, and central region average deformation is between 0.101mm-0.353mm, and right side area average deformation is between 0.05mm-0.202mm, more larger close to lower deformation, and lower area maximum distortion reaches 0.504mm.Left sliding gate erectility permissible error is 0.1mm, and from analysis, except top and local, right side, other region of framework does not all reach request for utilization.
Analyze reason from many aspects, left sliding gate erectility adopts one aluminium chassis structure, and for reaching weight loss effect, frame plate thickness only gets 15mm, and for ease of machining, the free state of ZL104 got by material, and yield strength is only 145Mpa, and intensity is not enough; Can see from emulation animation exports, 2 liftings are installed unstable, framework has obvious large-amplitude sloshing, this is also one of reason causing the large deformation of framework lower area, and allow the direct stressed this lifting method of framework itself just require very high to the rigidity of framework, should set about from these aspects carrying out reinforcement design.
Simulation is installed in strengthened lifting need analyze Aluminum alloy frame casting and welding aluminum frame simultaneously, it is no longer single part analysis, and the difference of both materials is one of factor of impact distortion just, can not, by both integrated treatments, assembly analytic approach be therefore adopted to emulate reinforcement design rear left sliding gate erectility.
The left sliding gate erectility maximum distortion strengthened after process is only 0.0436mm, be far smaller than the upper limit 0.1mm of requirement, from deformed region, the distortion of Aluminum alloy frame casting mainly concentrates on two non-active area, left and right, the yielding region deformation carrying additionally drill jig is very little, general within 0.03mm, this shows to be strict controlled in good guarantor's type effect that done strengthening measure plays the distortion of frock in margin tolerance.Left sliding gate erectility after strengthening process can meet installation requirement, therefore carries out use deformation analysis to frock further.
The maximum distortion in drill jig region is 0.0558mm, wherein right lower quadrant region deformation is only between 0.00939mm-0.00187mm, lower left quarter and central region distortion are between 0.0468mm-0.00187mm, top drill jig distortion is larger, reach 0.0468mm-0.0558mm, but also within tolerance 0.1mm scope.The principle stress value of perform region, at below 109Mpa, does not consider the material creep that temperature causes, and the distortion of left slide erectility perform region is all in elastic deformation area, and be placed on after a procedure on bracket, these distortion can recover, and can not produce accumulative distortion.Frock after strengthening design is described, during use, rigidity can reach requirement.
Claims (1)
1. a frock stiffness analysis method, based on the engineering analysis module of CATIA, is characterized in that, comprise the following steps:
Step one, feasibility modeling:
1.1 remove non-essential parts in frock, and each position, hole then removing component stayed blocks, and increase the counterweight of regular shape, to reduce the complexity of stress and strain model at the position not affecting frock integral rigidity;
The part that can merge in 1.2 same assemblies carries out integrated treatment; The key component affecting rigidity takes out corresponding assembly constraint according to actual conditions;
1.3 save as .stp form, reduce unnecessary geometric properties;
1.4 load the boundary condition of frock, load-up condition and material according to the actual service condition of frock;
1.5 multiplex (MUX)s put into row stress and strain model: adopt Nonlinear Grid to divide frock, grid cell size is between 30mm ~ 10mm;
Step 2, the model using step one to obtain use the frock analysis module of CATIA to carry out stiffness analysis to frock, analyze the part that the deflection exported finds out frock rigidity weakness;
Step 3, foundation deflection analysis result are modified to original model;
Step 4, repetition step 2 and step 3, until frock deflection is within the error range of allowable transformation.
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| CN103258086B true CN103258086B (en) | 2016-01-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103942384A (en) * | 2014-04-17 | 2014-07-23 | 北京航空航天大学 | Dynamic aircraft assembly scene real-time and three-dimensional visualization method based on head-mounted displayer |
| CN113500359A (en) * | 2021-07-23 | 2021-10-15 | 北京新风航天装备有限公司 | Precision machining method for long-wheelbase variable-diameter complex thin-wall structural part |
| CN113500358B (en) * | 2021-07-23 | 2023-04-11 | 北京新风航天装备有限公司 | Precision machining method for conical body |
Citations (2)
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|---|---|---|---|---|
| WO2007079759A1 (en) * | 2005-12-23 | 2007-07-19 | Webasto Ag | Method and device for constructing a moulded part |
| CN101419635A (en) * | 2007-10-23 | 2009-04-29 | 成都飞机工业（集团）有限责任公司 | Method for automatically generating digital-analog conduit welding clamp intelligence system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007079759A1 (en) * | 2005-12-23 | 2007-07-19 | Webasto Ag | Method and device for constructing a moulded part |
| CN101419635A (en) * | 2007-10-23 | 2009-04-29 | 成都飞机工业（集团）有限责任公司 | Method for automatically generating digital-analog conduit welding clamp intelligence system |
Non-Patent Citations (3)
| Title |
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| 基于CATIA的数字化标准工装库系统的开发;杨晓浪 等;《航空制造技术》;20101231(第13期);第89-93,96页 * |
| 基于CATIA飞机工装零件库的建立;彭春雷;《航空制造技术》;20101231(第21期);第79-80页 * |
| 基于规则和爆炸图的装配序列规划;李灿林 等;《计算机辅助设计与图形学学报》;20040831(第8期);第1106-1113页 * |
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