CN108170884A - A kind of pedestal of CNC milling machine pedestal optimum design method and optimization design - Google Patents

A kind of pedestal of CNC milling machine pedestal optimum design method and optimization design Download PDF

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Publication number
CN108170884A
CN108170884A CN201711205124.3A CN201711205124A CN108170884A CN 108170884 A CN108170884 A CN 108170884A CN 201711205124 A CN201711205124 A CN 201711205124A CN 108170884 A CN108170884 A CN 108170884A
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China
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pedestal
model
milling machine
analysis
optimization
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蔡伯阳
刘晓颖
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Huaqiao University
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Huaqiao University
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00Computer-aided design [CAD]
    • G06F30/20Design optimisation, verification or simulation
    • G06F30/23Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/01Frames, beds, pillars or like members; Arrangement of ways
    • B23Q1/015Frames, beds, pillars

Abstract

The invention discloses the pedestal of a kind of CNC milling machine pedestal optimum design method and optimization design, method includes:Establish milling machine base model before optimizing;The substructure model of foundation is imported into finite element analysis software and carries out static analysis;Mesh generation is carried out to model before optimization, several solid elements is chosen and carries out finite element analysis;The heart places load body in a model, the bolt hole of model bottom surface is set as fixed constraint, analysis obtains total stress cloud atlas;Model is optimized;It keeps the original boundary condition of pedestal, load value and load mode constant, model analysis and static analysis is carried out to pedestal;Modal test is carried out using the hammering method of single-point-excitation more points collection, the position of energized position and movable sensor is hammered into shape by fixed exciting to pick up the vibration of lathe base;Pedestal two modal testing results and finite element modelling result are compared.Present invention can ensure that CNC milling machine will not resonate in operating rotational speed range, avoid influencing machining accuracy due to vibration.

Description

A kind of pedestal of CNC milling machine pedestal optimum design method and optimization design
Technical field
The present invention relates to CNC milling machine pedestal design optimizing fields, and in particular to a kind of CNC milling machine pedestal optimization is set The pedestal of meter method and optimization design.
Background technology
Technology of Machine Tool is fast-developing at present, and lathe whole processing performance is typically implemented in three aspects, is high-precision respectively Degree, high speed and high reliability.So raising lathe whole processing performance is most important, the height of the static and dynamic stiffness of CNC milling machine The low machining accuracy for directly affecting milling machine and service life.In the traditional design method stage, only pass through advanced development and dynamic characteristic Test, just can know that the dynamic property of designed product, although China is the most country of machine output in the world, by Relatively backward in design method, the lathe produced is difficult to meet the processing requests such as efficient, high-precision, in operating rotational speed range The problem of easily resonating, influencing machining accuracy due to vibration often occurs, therefore, how should dynamic optimization design method It uses on CNC milling machine, Design and optimization goes out the milling machine of suitable China domestic user demand, not only economically has great meaning Justice, while China's national defense industrial expansion is also had far-reaching significance.
Invention content
It is an object of the invention to overcome the deficiency of the prior art, providing one kind can solve in operating rotational speed range easily It resonates, the CNC milling machine pedestal optimum design method of machining accuracy and the pedestal of optimization design is influenced due to vibration.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of CNC milling machine pedestal optimum design method, including:
Step S10 establishes milling machine base model before optimization;
The substructure model established in step S10 is imported finite element analysis software, model before optimization is carried out by step S20 Static analysis obtains X, Y and the Static stiffness of Z-direction;
Step S30 carries out mesh generation to model before optimization, chooses several solid elements and carries out finite element analysis;
Step S40, heart placement load body, is set as fixed constraint by the bolt hole of model bottom surface, is analyzed in a model, Obtain total stress cloud atlas;
Step S50 according to the analysis of step S40, optimizes model;
Step S60 keeps the original boundary condition of pedestal, load value and load mode constant, mode point is carried out to pedestal Analysis and static analysis, the solid element body are defined by ten nodes;
Step S70, mould measurement are tested using the hammering method of single-point-excitation more points collection, are hammered into shape by fixed exciting The vibration of lathe base is picked up in the position of energized position and movable sensor;
Pedestal two modal testing results and finite element modelling result are compared by step S80.
Further, in step S10, milling machine base modeling is to utilize ansys parametric modelings or 3 d modeling software row Modeling.
Further, in step S30, the solid element body is defined by several nodes, each node along X, Y, Z-direction has the degree of freedom of 3 translations.
Further, in step S50, described the step of being optimized to model, includes:
Step S51 increases several displacement constraints around the center of base bottom;
The material of pedestal surrounding is thinned in step S52;
Four of pedestal corner small panes are synthesized a big pane by step S53.
Further, in step S70, the mode order of mould measurement is 10.
Further, in step S70, point position is 36.
Further, the comparison result according to step S80 changes design variable, generates new Optimized model, carry out again Optimization design carries out two modal testing results and finite element modelling results contrast.
The present invention also provides a kind of pedestal designed using above-mentioned optimum design method, including pedestal, workbench and setting Two support plates in the pedestal both sides;The workbench is arranged on above the pedestal;The small pane is evenly distributed on The bottom of the pedestal.
Further, the depth of the inner cavity of the big pane is less than the depth of the inner cavity of the small pane.
Further, the depth ratio of the depth of the inner cavity of pane big described in root and the inner cavity of the small pane is 1: 1.25。
Further, several floors are evenly distributed in the support plate;It keeps out described one end of the floor On the baffle of support plate, the other end of the floor is kept out on the side wall of the pedestal.
Further, several support plate panes are additionally provided in the support plate;The support plate pane is located at adjacent Between two floors.
The advantageous effect that technical solution provided by the invention is brought is:
(1) CNC milling machine pedestal optimum design method provided by the invention ensures CNC milling machine in operating rotational speed range not Cause is resonated, and avoids influencing machining accuracy due to vibration;
(2) pedestal of optimization design of the present invention is at natural frequencies, two modal testing results and Finite Element Simulation As a result measures of dispersion is between -15% to -10%;In high-order intrinsic frequency, two modal testing results and Finite Element Simulation knot The measures of dispersion of fruit therefore deduces that Finite Element Simulation result can preferably react modal test test -10% or so Truth, finite element simulation and the modal test of lathe base are fitted preferable.
The present invention is described in further detail with reference to the accompanying drawings and embodiments, but a kind of CNC milling machine bottom of the present invention The pedestal of seat optimum design method and optimization design is not limited to embodiment.
Description of the drawings
Fig. 1 is the flow chart of the present invention;
Fig. 2 is the three-dimensional structure diagram of the CNC milling machine pedestal of the present invention;
Fig. 3 is the three-dimensional structure diagram that lotus body is loaded on the CNC milling machine pedestal of the present invention;
Fig. 4 is the three-dimensional structure diagram before the pedestal optimization of the present invention;
Fig. 5 is the three-dimensional structure diagram after the pedestal optimization of the present invention;
Fig. 6 is the total stress cloud atlas one of loading lotus body before pedestal optimization of the present invention;
Fig. 7 is the total stress cloud atlas two of loading lotus body before pedestal optimization of the present invention;
Fig. 8 is the structure chart of the measuring point of the present invention;
Fig. 9 is total displacement Aberration nephogram one after the pedestal of the present invention optimizes;
Figure 10 is total displacement Aberration nephogram two after the pedestal of the present invention optimizes.
Reference numeral:100th, measuring point, 200, load body, 310, pedestal, 320, workbench, 321, table top, 3211, first points Every beam, 3212, second separates beam, 322, small pane, 323, big pane, 330, support plate, 331, support plate pane, 332, Floor, 333, baffle.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work Embodiment shall fall within the protection scope of the present invention.
Referring to figs. 1 to Figure 10, a kind of CNC milling machine pedestal optimum design method as shown in Figure 1 includes the following steps:
Step S10 establishes milling machine base model before optimization as shown in Figure 2, wherein, milling machine base modeling is to utilize Ansys parametric modelings or 3 d modeling software are modeled.
Step S20, finite element analysis software is imported by the substructure model in step S10, and static(al) is carried out to model before optimization Analysis, obtain X, Y, Z-direction Static stiffness.
Step S30 carries out mesh generation to model before optimization, chooses several solid elements and carries out finite element analysis, In step S30, the solid element body is defined by several nodes, each node along X, Y, Z-direction have 3 translation Degree of freedom, the solid element have second displacement pattern, can preferably simulate irregular model.The solid element body leads to Ten nodes are crossed to define, the solid element is the three-dimensional ten node solid structure units of high-order.
Using structure size, weight mass, balance position, support stiffness as design variable, with displacement minimum and quality Most gently for object function to CNC milling machine carry out multi-state Optimal Structure Designing, it is ensured that CNC milling machine in operating rotational speed range not Cause is resonated, and avoids influencing machining accuracy due to vibration.
The bolt hole of model bottom surface as shown in figure 3, the heart places load body 200 in a model, is set as fixed by step S40 Constraint, is analyzed, and obtains total stress cloud atlas;Preferably, in order to really simulate the loading conditions of pedestal, in table core The iron block of one piece of 1200mm × 800mm × 400mm is placed, simulates the stressing conditions of pedestal, base end face there are 22 bolts hole, entirely Portion is set as fixed constraint, i.e., the degree of freedom in 6 directions is all locked.
Preferably, the load body 200 is iron block.
Step S50 according to the analysis of step S40, optimizes model;Due to setting for body of numerical-control milling machine structure Size and distribution form are counted, determines the various static characteristics of itself.It is right by the static check of pedestal it is found that in step S50 The step of model optimizes be:Step S51, since the deformation ratio of base bottom is larger, in the center of base bottom week Enclosing increases multiple constraints;Step S52 as shown in figure 4, because the deflection of pedestal surrounding is less, is removed in pedestal surrounding Material, specifically, the support floor of surrounding is thinned;Step S53, as shown in figure 5, four small panes by pedestal corner 322 one big pane 323 of synthesis.
Step S60 keeps the original boundary condition of pedestal, load value and load mode constant, mode point is carried out to pedestal Analysis and static analysis, are calculated 10 rank intrinsic frequencies and the corresponding vibration shape before milling machine.
Total displacement Aberration nephogram can be seen that after pedestal optimization as shown in Figure 9 and Figure 10:Pedestal is removing a part of material Afterwards, deflection is fewer than the deflection before being not optimised, meanwhile, the structure of bottom is also simpler than before, is processing, casting etc. It is easier before aspect ratio, meet design requirement.
Step S70, mould measurement using the hammering method test method of single-point-excitation more points collection, are hammered into shape by fixed exciting The vibration of lathe base is picked up in energized position, the position of movable sensor;Analysis optimization, and machine are carried out to machine dynamic performance The processing performance and dynamic property of bed are closely related, in the cost for taking into account lathe simultaneously so that lathe has light weight, cost The characteristics of low, easy to use, is illustrated in figure 8 the arrangement of 100 position of mould measurement measuring point, in step S70, mould measurement Mode order is 10.
Step S80, pedestal two modal testing results are compared with finite element modelling result, obtain the maximum shear stress value, And compared with calculated value, to verify the setting correctness of the finite element model, verify the feasibility of model, compare numerical control Milling machine base static analysis experimental result and FEM calculation value, analytical error Producing reason.
According to the comparison result of step S80, design variable is changed, new Optimized model is generated, optimizes again, Two modal testing results and finite element modelling results contrast are carried out, the accuracy of finite element modelling result is demonstrated by modal test With reliability.
Specifically, as shown in figure 8, in step S70,100 position of measuring point is 36, to pedestal two modal testing results with having The first analog result of limit compares.
Two modal testing results and finite element modelling results contrast are as shown in table 1 below:
Table 1
It can be obtained by correction data:To lathe base, at natural frequencies, two modal testing results are imitated with finite element modelling The measures of dispersion of true result is between -15% to -10%;For the high-order intrinsic frequency of pedestal, two modal testing results and finite element The measures of dispersion of analog simulation result therefore deduces that Finite Element Simulation result can preferably react mould -10% or so The truth of state experimental test, finite element simulation and the modal test of lathe base are fitted preferable.
It can be seen that by the total stress cloud atlas of Fig. 6 and Fig. 7:The deformation of lathe bed maximum is that workpiece contacts position with workbench It puts, it is maximum mainly due to the pressure suffered by the contact position of iron block and workbench.Iron block becomes with workbench contact area Shape, but deflection is smaller.From stress divided by, maximum stress l.OlMPa is happened at iron block and workbench contact area, It is consistent with Aberration nephogram.In lathe bed and workbench contact area Jun You stress branch, but it is all smaller, far below the limit of material Stress meets stress requirement.
CNC milling machine pedestal optimum design method in the present invention is established by Pro/Engineer 3 d modeling softwares The finite element model of CNC milling machine understructure using finite element method, carries out numerical control milling machine base in ANSYS quiet Power is analyzed and model analysis, and combines finite element analysis as a result, carrying out Optimal Structure Designing, the number of use to numerical control milling machine base The material of milling machine base is controlled as HT250, elasticity modulus is 1.1 × 105MPa, Poisson's ratio 0.28, density is 7.28 × 103kg/m3, CNC milling machine pedestal optimum design method provided by the invention ensures that CNC milling machine will not in operating rotational speed range It resonates, avoids influencing machining accuracy due to vibration.
The CNC milling machine pedestal of certain numerically-controlled machine tool factory is optimized by finite element software, analog simulation result table It is bright:For CNC milling machine pedestal under the action of by static pressure, workpiece and the pressure suffered by workbench contact position are maximum;It is excellent After change, deflection reduces, and bottom structure is simple, easy to process.
It is found by simulation analysis, carries out the parameter multi-objective optimization design of power of pedestal, reduce the strain of lathe base Amount, while reduce the quality of pedestal.By being compared to new departure and former scheme, after optimization, preferable optimization knot is achieved Fruit.Targetedly Optimal Structure Designing is carried out for Machine Tool design personnel, certain theoretical foundation is provided, avoid blindly, contracting significantly The short design cycle has certain theoretical guide effect to the production design of enterprise.
Used model analysis basic theories includes:It is defined by Theory of Vibration, many-degrees of freedom system is with some intrinsic frequency The vibration shape that rate is presented when vibrating is known as mode.The core content of model analysis is to determine to description scheme system dynamic The relevant parameter of characteristic.
For a multi-Degree-of Freedom Linear Systems, differential equation of motion is:
MX "+CX'+KX=F (t)
Wherein, M represents mass matrix;K represents stiffness matrix;X represents motion vector;X' represents that the single order of motion vector is led Number;X " represents the second dervative of motion vector;F (t) represents applied force vector;T represents the time;As F (t)=0, ignore damping The influence of C, equation become:
MX "+KX=0
During free vibration, each point makees simple harmonic oscillation, each node displacement in structure
X=Φ-ejωt
It can be obtained by two formulas above
(K-ω2M) Φ=0
Characteristic value ω is obtained2With characteristic value Φ.
According to the π f of formula ω=2, therefore each rank intrinsic frequency of system and Mode Shape can be acquired.
The present invention also provides a kind of CNC milling machine bottoms using above-mentioned CNC milling machine pedestal optimum design method optimization design Seat, as shown in Figure 2 and Figure 4, including pedestal 310, workbench 320 and support plate 330, the workbench 320 is arranged on the base On seat 310, the support plate 330 is arranged on the both sides of the pedestal 310, and the workbench 320 has table top 321, described small Pane 322 and the big pane 323 be distributed in the pedestal 310 the table top 321 of bottom on, on the table top 321 Also there are several interlaced the first separation beams 3211 and second to separate beam 3212, the small pane 322 is located at described First, which separates beam 3211 and second, separates in the region that beam 3212 separates.
As shown in figure 5, being evenly distributed with several floors 332 in the support plate 330, one end of the floor 332 is equal It keeps out on the baffle 333 of the support plate 330, the other end of the floor 332 keeps out the side wall in the pedestal 310 On, also there are several support plate panes 331, the support plate pane 331 is located at two neighboring floor in the support plate 330 Between 332.
Preferably, the depth of the inner cavity of the big pane 323 is less than the depth of the inner cavity of the small pane 322.
Preferably, the depth ratio of the depth of the inner cavity of the big pane 323 and the inner cavity of the small pane 322 is 1: 1.25。
It these are only the preferred embodiment of the present invention, be not intended to restrict the invention, for those skilled in the art For member, the invention may be variously modified and varied.Any modification for all within the spirits and principles of the present invention, being made, Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims (10)

1. a kind of CNC milling machine pedestal optimum design method, feature are, including:
Step S10 establishes milling machine base model before optimization;
Step S20, finite element analysis software is imported by the substructure model established in step S10, and static(al) is carried out to model before optimization Analysis obtains X, Y and the Static stiffness of Z-direction;
Step S30 carries out mesh generation to model before optimization, chooses several solid elements and carries out finite element analysis;
Step S40, heart placement load body (200), is set as fixed constraint by the bolt hole of model bottom surface, is divided in a model Analysis obtains total stress cloud atlas;
Step S50 according to the analysis of step S40, optimizes model;
Step S60 keeps the original boundary condition of pedestal, load value and load mode constant, pedestal is carried out model analysis and Static analysis, the solid element body are defined by ten nodes;
Step S70, mould measurement are tested using the hammering method of single-point-excitation more points collection, pass through fixed exciting hammer excitation The vibration of lathe base is picked up in position and the position of movable sensor;The mode order of mould measurement is 10;
Pedestal two modal testing results and finite element modelling result are compared by step S80.
2. CNC milling machine pedestal optimum design method according to claim 1, which is characterized in that in step S10, milling machine bottom Seat modeling is modeled using ansys parametric modelings or 3 d modeling software row.
3. CNC milling machine pedestal optimum design method according to claim 1, which is characterized in that in step S30, the reality Body unit body is defined by several nodes, and each node has the degree of freedom of 3 translations along X, Y, Z-direction.
4. CNC milling machine pedestal optimum design method according to claim 1, which is characterized in that described right in step S50 The step of model optimizes includes:
Step S51 increases several displacement constraints around the center of base bottom;
The material of pedestal surrounding is thinned in step S52;
Four of pedestal corner small panes (322) are synthesized a big pane (323) by step S53.
5. CNC milling machine pedestal optimum design method according to claim 1, which is characterized in that the ratio according to step S80 Compared with as a result, modification design variable, generate new Optimized model, optimize again, carry out two modal testing results with it is limited First analog result compares.
6. a kind of pedestal of optimum design method design using as described in any one of claim 1 to 5, feature are, Including pedestal (310), workbench (320) and two support plates (330) for being arranged on the pedestal (310) both sides;The workbench (320) it is arranged on above the pedestal (310);The small pane (322) is evenly distributed on the bottom of the pedestal (310).
7. the pedestal of optimization design according to claim 6, which is characterized in that the inner cavity of the big pane (323) Depth is less than the depth of the inner cavity of the small pane (322).
8. the pedestal of optimization design according to claim 7, which is characterized in that the inner cavity of big pane (323) described in root The depth ratio of inner cavity of depth and the small pane (322) be 1:1.25.
9. the pedestal of optimization design according to claim 7, which is characterized in that be uniformly distributed on the support plate (330) There are several floors (332);One end of the floor (332) is kept out on the baffle (333) of the support plate (330), institute The other end for stating floor (332) is kept out on the side wall of the pedestal (310).
10. the pedestal of optimization design according to claim 9, which is characterized in that be additionally provided on the support plate (330) Several support plate panes (331);The support plate pane (331) is between two neighboring floor (332).
CN201711205124.3A 2017-11-27 2017-11-27 A kind of pedestal of CNC milling machine pedestal optimum design method and optimization design Pending CN108170884A (en)

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Application publication date: 20180615