CN101576938A - Method for optimizing bed pieces of large-scale crankshaft lathes - Google Patents

Abstract

The invention relates to a method for optimizing bed pieces of large-scale crankshaft lathes, which comprises the steps of: performing precision three-dimensional geometric modeling in three-dimensional high-end software PRO/ENGINEER, and setting physical properties, load and boundary conditions in a submodule PRO/MECHANICA of the PRO/ENGINEER. A physical model in the PRO/MECHANICA is formed by directly conducting from the PRO/ENGINEER, the dynamic seamless link exists between the PRO/MECHANICA and the PRO/ENGINEER, the change of a geometric model can be directly reflected in the physical model during the optimization, thus, the optimization time is greatly saved. The mesh partition is automatically generated in the PRO/MECHANICA, and sensitive areas can be manually thinned. The method performs finite element calculation, finds weak links, optimizes the weak links, and finally obtains an optimal solution. The method can reduce optimization time, obtain an accurate result, and can be widely applied to the optimization design of the bed pieces of the large-scale crankshaft lathes.

Description

The optimization method of bed pieces of large-scale crankshaft lathes

Technical field

The present invention relates to a kind ofly carry out body of lathe bed optimization method with three-dimensional software.

Background technology

Along with the continuous development of industry, lathe develops to high-grade, precision and advanced direction.Lathe bed is the basic of lathe, and the quality of lathe bed performance directly influences the precision of lathe, and external lathe industry has long history, has obtained a large amount of practical experiences and experimental data in actual production.And China's lathe industry starting is late, starting point is low, does not have developed countries through century-old experience.So always encounter problems in exploitation with when improving bed piece, address these problems before and can only or directly buy foreign technology by a large amount of experiment of do-it-yourself, expend a large amount of manpower financial capacities.And crankshaft lathe of large boat is higher to the requirement of lathe bed.So it is necessary needing a kind of optimization method of bed pieces of large-scale crankshaft lathes.PRO/ENGINEER with and submodule PRO/MECHANICA be the high-end software of finite element modeling and analysis, exist dynamic seamless link between them, the modification in geometric model can directly be reflected in the physical model, can shorten the optimization time.

Summary of the invention

The present invention be to solve the design of present heavy duty machine tools lathe bed and improve in expend lot of manpower and material resources and don't be problem very accurately, and provide a kind of accurately, be easy to optimization process, save the optimization method of design and the bed pieces of large-scale crankshaft lathes of the time of improvement greatly.

For achieving the above object, technical scheme of the present invention is: a kind of optimization method of bed pieces of large-scale crankshaft lathes, and concrete steps are as follows:

(1) sets up 3-D geometric model

Use PRO/ENGINEER march shaft lathe lathe bed and headstock three-dimensional geometry parametric modeling, and model is assembled;

(2) load, the setting of boundary condition and physical characteristics

Enter PRO/ENGINEER submodule PRO/MECHANICA, power, moment of torsion, material behavior, boundary condition are set;

(3) grid dividing

Adopt the PRO/MECHANICA automatic mesh to divide, calculating the manual refinement in sensitizing range;

(4) finite element solving

Adopt the P method of PRO/MECHANICA to carry out finite element solving calculating;

(5) find weak link and modification

Extract the result of finite element of stress, strain and displacement, seeking influences the element of lathe bed, and is optimized;

(6) selected optimal result

Select optimizing the standard of effective evaluation, the row filter optimal result of going forward side by side according to actual conditions.

The invention has the beneficial effects as follows: used finite element modeling and analyze high-end software PRO/ENGINEER with and submodule PRO/MECHANICA, the large-scale body of lathe bed is optimized parsing, finally can conveniently obtain optimized results, save a large amount of time, and can obtain accurate result.

Description of drawings

Fig. 1 is a bed pieces of large-scale crankshaft lathes optimization step block diagram;

Fig. 2 is bed pieces of large-scale crankshaft lathes and headstock illustraton of model;

Fig. 3 is the lathe bed illustraton of model;

Fig. 4 is whole maximum distortion figure as a result;

Fig. 5 is that lathe bed part proportion of deformation amplifies figure as a result;

Fig. 6 optimizes back lathe bed part proportion of deformation to amplify figure as a result;

Fig. 7 is the lathe bed part deformation result figure that finally obtains optimal result.

Specific embodiments

Now in conjunction with the accompanying drawings this present invention's optimization solution analysis method is described further.

The optimization method of bed pieces of large-scale crankshaft lathes of the present invention, concrete steps (as Fig. 1):

1. use PRO/ENGINEER to carry out 3 d geometric modeling

Use PRO/ENGINEER to carry out accurate Geometric Modeling, and model is assembled.Shown in Fig. 2 and 3.

2. enter PRO/ENGINEER submodule PRO/MECHANICA, the load that imposes restriction enters PRO/MECHANICA from PRO/ENGINEER, forward physical model to from geometric model, it between them seamless dynamic link, change on the geometric model directly is reflected in the physical model, and other setting is constant.According to actual conditions model is applied material, weight application in this example.

3. in PRO/MECHANICA, carry out the simplification of grid dividing and grid

PRO/MECHANICA is the submodule of PRO/ENGINEER, and the butt joint between them is seamless, can any error not occur because of geometric model imports to physical model.Grid dividing is to divide automatically, and can carry out manual refinement in the sensitizing range.This routine grid chart such as Fig. 4.

4. finite element solving calculates

PRO/MECHANICA adopts P method processing unit lattice when carrying out FEM (finite element) calculation, compare other finite element software shortening computing time, but precision does not reduce.Obtain result such as Fig. 5 and 6.

5. find weak link to be optimized processing

Be the lathe bed of large-scale crank shaft lathe peculiar to vessel in this example, optimize the variation that the effective evaluation standard is chosen to be the size and the quality of maximum deformation value.Optimize result such as Fig. 7.Final maximum distortion has reduced 43.9%, and weight has only increased by 5.17%.

Claims (1)

1. the optimization method of a bed pieces of large-scale crankshaft lathes, concrete steps are as follows:

(1) sets up 3-D geometric model

Use PRO/ENGINEER march shaft lathe lathe bed and headstock three-dimensional geometry parametric modeling, and model is assembled;

(2) load, the setting of boundary condition and physical characteristics

Enter PRO/ENGINEER submodule PRO/MECHANICA, power, moment of torsion, material behavior, boundary condition are set;

(3) grid dividing

Adopt the PRO/MECHANICA automatic mesh to divide, calculating the manual refinement in sensitizing range;

(4) finite element solving

Adopt the P method of PRO/MECHANICA to carry out finite element solving calculating;

(5) find weak link and modification

Extract the result of finite element of stress, strain and displacement, seeking influences the element of lathe bed, and is optimized;

(6) selected optimal result

Select optimizing the standard of effective evaluation, the row filter optimal result of going forward side by side according to actual conditions.

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