CN102419784B - Design method of multiple-spindle cascading structure of PCB (printed circuit board) drilling machine - Google Patents
Design method of multiple-spindle cascading structure of PCB (printed circuit board) drilling machine Download PDFInfo
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- CN102419784B CN102419784B CN2011102138807A CN201110213880A CN102419784B CN 102419784 B CN102419784 B CN 102419784B CN 2011102138807 A CN2011102138807 A CN 2011102138807A CN 201110213880 A CN201110213880 A CN 201110213880A CN 102419784 B CN102419784 B CN 102419784B
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Abstract
The invention relates to a design method of a multiple-spindle cascading structure of a PCB (printed circuit board) drilling machine. A bottom plate is divided into at least two different conditions according to conditions that related parts are arranged on the bottom plate. The bottom plate under each condition is subjected to free mode analysis and stimulation by combining test analysis of a vibrating measuring instrument with CAE (Computer Aided Engineering) stimulation, so that the design basis of the bottom plate and the related parts arranged on the bottom plate is obtained. Due to the adoption of the method, the influence of the bottom plate, a guide rail sliding block, a cascading form, the structure connection rigidity, processing of shaft parts and the like on the dynamic characteristics of the cascading structure can be ensured to be sufficiently considered when the multiple-spindle cascading structure is designed, so that the design is optimized.
Description
Technical field
The present invention relates to the design of PCB rig multiaxis cascade structure, particularly relate to and adopt emulation and the design of testing the mode that combines and carrying out.
Background technology
On the one hand, the dynamic perfromance of PCB rig multiaxis cascade structure is large on the machining precision impact of rig, and research PCB rig multiaxis cascade structure is necessary.Base plate is as the basic part of cascade structure, and its dynamic perfromance has determined the dynamic perfromance of cascade structure.In addition, PCB rig multiaxis cascade structure dynamic perfromance also is subject to the impact of guide rail slide block, cascade form and structure joint stiffness and machining shaft part.
At present, when the design of multiaxis cascade structure is carried out in the industry inherence, fail to fully take into account the variation of basic part-base plate dynamic perfromance in assembling process of cascade structure.Simultaneously, the choosing of guide rail slide block, cascade form and structure joint stiffness determine and the choosing of machining shaft part in, also fail to take into full account their impacts on the dynamic perfromance of cascade structure.
On the other hand, be the main stream approach of present scientific and technological circle with emulation with the method that test combines.This method not only cost is lower, and easily accomplishes the essential laws of the problem that discloses.
As seen, be necessary in fact existing design means is improved, make the method that can organically adopt emulation to combine with test in the design of PCB rig multiaxis cascade structure,, to improve the dynamic design ability, obtain more excellent PCB rig multiaxis cascade structure.
Summary of the invention
The technical problem to be solved in the present invention is to overcome above-mentioned the deficiencies in the prior art, and a kind of method for designing of PCB rig multiaxis cascade structure is proposed, can guarantee when carrying out the design of multiaxis cascade structure, fully take into account the impact on the dynamic perfromance of cascade structure such as base plate and guide rail slide block, cascade form and structure joint stiffness and machining shaft part, thereby design is optimized.
The technical scheme that the present invention solves the problems of the technologies described above employing comprises, a kind of method for designing of PCB rig multiaxis cascade structure is proposed, base plate is divided at least two different situations by the situation that associated components is installed on it, adopt the vibration measurement instrument test analysis to be combined and to carry out Free Modal Analysis and emulation with CAE emulation to the base plate of each situation, to obtain base plate itself and to be arranged on the design considerations of the associated components of this base plate.
In the present invention, base plate can be divided into two different situations by the situation that associated components is installed on it: the first situation is knocked-down base plate, and the second situation is the base plate that is equipped with guide rail; , according to the Free Modal Analysis of the first situation and the result of emulation, directly obtain the design considerations of base plate itself; Contrast according to the result of the Free Modal Analysis of the second situation and the first situation and emulation, obtain the foundation that guide rail slide block is chosen.
In the present invention, base plate can be divided into three different situations by the situation that associated components is installed on it: the first situation is knocked-down base plate, and the second situation is the base plate that is equipped with guide rail, and the third situation is the base plate of multiaxis cascade; Contrast according to the result of the Free Modal Analysis of the third situation, the second situation and the first situation and emulation, obtain the foundation that cascade form and structure joint stiffness are chosen.
In the present invention, base plate can be divided into four different situations by the situation that associated components is installed on it: the first situation is knocked-down base plate, the second situation is the base plate that is equipped with guide rail, the third situation is the base plate of multiaxis cascade, and the 4th kind of situation is the base plate that the multiaxis cascade of main electric axis is installed; , according to the contrast of the result of the Free Modal Analysis of the 4th kind of situation, the third situation, the second situation and the first situation and emulation, obtain the foundation of choosing of machining shaft part.
In the present invention, to the base plate of each situation, adopt the vibration measurement instrument test analysis to be combined the process of carrying out Free Modal Analysis and emulation with CAE emulation, comprise the following steps:
Set up a three-dimensional entity model of the base plate of corresponding situation at CAD software;
In corresponding three-dimensional entity model converting input CAE software, the definition material parameter is set, sets up the boundary condition consistent with test;
Emulation obtains the modal parameter of associated floor;
Adopt vibration measurement instrument to carry out test modal analysis to the base plate of corresponding situation, obtain the Modal Test result; And
, with test result and simulation result comparative analysis, determine the base plate modal parameter of corresponding situation.
In the present invention, adopting vibration measurement instrument to carry out test modal analysis to the base plate of corresponding situation is to utilize a three dimensional taest model to test the base plate of corresponding situation.
In the present invention, the process of a three dimensional taest model of setting up the base plate of corresponding situation comprises: choose suitable energisation mode and arrange suitable response point on the base plate of this corresponding situation, according to the shape of the base plate of this corresponding situation and the response point of layout, set up this three dimensional taest model by the form of input coordinate in software, with the profile of the response point of probably depicting shape and layout.
In the present invention, in the process of utilizing this three dimensional taest model to test the base plate of this corresponding situation, position in the test point on the base plate of this corresponding situation is corresponding with the point on this three dimensional taest model of setting up, and the direction of test is also consistent with this three dimensional taest model direction of coordinate system in software.
In the present invention, described this three dimensional taest model that utilizes is tested and comprised the base plate of this corresponding situation: set up the test boundary condition consistent with the emulation boundary condition, firmly hammer excitation, adopt the constant excitation point, and the method for mobile test point is tested; The content measurement of each test point is excitation and vibration acceleration response, utilizes the method for modal parameter estimation to draw the test value of modal parameter.
In the present invention, described process with test result and simulation result comparative analysis comprises: with the natural frequency of the base plate of the corresponding situation of simulate and test and Mode Shape contrast.
compared with prior art, the method for designing of PCB rig multiaxis cascade structure of the present invention, by base plate is divided at least two different situations by the situation that associated components is installed on it, base plate to each situation adopts the vibration measurement instrument test analysis to be combined and to carry out Free Modal Analysis and emulation with CAE emulation, can obtain base plate itself and be arranged on the design considerations of the associated components of this base plate, can guarantee when carrying out the design of multiaxis cascade structure, fully take into account base plate and guide rail slide block, the impact on the dynamic perfromance of cascade structure such as cascade form and structure joint stiffness and machining shaft part, thereby design is optimized.
Description of drawings
Fig. 1 a, 1b and 1c are multiaxis cascade PCB drill configuration schematic diagram, and wherein, Fig. 1 a is whole, and Fig. 1 b is the combination of an axle, and Fig. 1 c is the decomposition of an axle.
Fig. 2 a to 2e is the base plate model, and wherein, Fig. 2 a is the mode test model, and Fig. 2 b is the base plate of the first situation, and Fig. 2 c is the base plate of the second situation, and Fig. 2 d is the base plate of the third situation, and Fig. 2 e is the base plate of the 4th kind of situation.
Fig. 3 is test and simulation process block diagram.
Fig. 4 is the process flow diagram of the inventive method embodiment.
Fig. 5 is the mode test parameter table of the base plate of first and second kinds of situations.
Fig. 6 is the mode test parameter table of the base plate of third and fourth kind of situation.
Fig. 7 is test and the simulation result contrast of the base plate of the first situation.
Embodiment
Be described in further detail below in conjunction with the most preferred embodiment shown in accompanying drawing.
See also Fig. 1 a, 1b and 1c, multiaxis cascade PCB rig generally includes a lathe bed, flatly be arranged on lathe bed, in order to place a worktable of pcb board, this worktable is arranged on a crossbeam on this lathe bed and some Z axis base plates vertically relatively.Whether the Z axis base plate is equipped with miscellaneous part according to itself, can be divided into several different situations.Generally, the complete Z axis bottom deck assembly of assembling includes a Z axis base plate, a Z axis slide block, an X-axis slide block, one-level interlocking jack panel, a main shaft fixture and an electric machine main shaft.
see also the base plate model shown in 2a to 2e, wherein, Fig. 2 a is the mode test model, Fig. 2 b is base plate (the knocked-down base plate of the first situation, in other words, base plate itself), Fig. 1 c is the base plate (base plate of slide block is installed) of the second situation, Fig. 1 d is base plate (the multiaxis cascade base plate of the third situation, namely, slide block and a plurality of base plate that cascades up are installed), Fig. 1 e is that the base plate of the 4th kind of situation (is installed electric main shaft multiaxis cascade base plate, namely, slide block is installed, a plurality of base plates that cascade up and electric machine main shaft are clamped in the main shaft fixture).
See also Fig. 3, the principle of work of the method for designing of PCB rig multiaxis cascade structure of the present invention is: with finite element software, the 3D model of the base plate of various situations is carried out Free Modal Analysis, obtain the simulation value of modal parameter; With vibration measurement instrument, the three dimensional taest model of the base plate of various situations tested and carried out model analysis, obtaining the test value of modal parameter; This simulation value and test value are analyzed.
The process of setting up of this three dimensional taest model roughly comprises: at first choose suitable energisation mode and arrange suitable response point on entity, then set up three dimensional taest model by the form of input coordinate according to the shape of entity and the response point that we arrange in software, probably depict the profile of entity.While adopting the test of base plate of the various situations of this three dimensional taest model-aided, the position of test point is corresponding with the point of the three dimensional taest model of setting up on the base plate of various situations, the direction of test is also consistent with three dimensional taest model direction of coordinate system in software, after setting up in other words the three dimensional taest model, according to the position of putting on model and in software the direction of coordinate system, corresponding point and the direction thereof of test on the base plate of various situations.
See also Fig. 4, the flow process of the inventive method embodiment roughly comprises:
Steps A: adopt the base plate that the vibration measurement instrument test analysis is combined with CAE emulation to the first situation to carry out Free Modal Analysis and emulation, obtain knocked-down base plate modal parameter;
Step B: adopt the base plate that the vibration measurement instrument test analysis is combined with CAE emulation to the second situation to carry out model analysis and emulation, obtain its modal parameter, and with the result that steps A obtains, be analyzed, for choosing of guide rail slide block provides foundation;
Step C: adopt the base plate that the vibration measurement instrument test analysis is combined with CAE emulation to the third situation to carry out model analysis and emulation, obtain its modal parameter, and with the result that steps A, B obtain, be analyzed, determine to provide foundation for cascade form and structure joint stiffness;
Step D: adopt the base plate that the vibration measurement instrument test analysis is combined with CAE emulation to the 4th kind of situation to carry out model analysis and emulation, obtain its modal parameter, and with the result that steps A, B, C obtain, be analyzed, for choosing of machining shaft part provides foundation.
Described steps A, B, C, D include following steps:
Set up the base plate three-dimensional entity model of corresponding situation at CAD software;
In corresponding three-dimensional entity model converting input CAE software, definition material parameter, foundation are set with back, test consistent boundary condition etc.;
Emulation obtains the modal parameter of associated floor;
Adopt vibration measurement instrument to carry out test modal analysis to the base plate of corresponding situation, obtain the Modal Test result; And
, with test result and simulation result comparative analysis, determine the base plate modal parameter of corresponding situation.
In the inventive method, the specific implementation process of steps A comprises:
Set up knocked-down base plate three-dimensional entity model (the first situation in Solidworks, see also Fig. 2 b), in its converting input Abaqus finite element software, definition material parameter, the foundation boundary condition etc. that conforms to physical condition is set, carry out Modal Analysis, obtain simulation result.
Utilizing the Geometry module of the Test.Lab software of LMS company to set up the mode test model of base plate (sees also Fig. 2 a), for the back test, uses.
Base plate is supported with flexible suspension, and firmly hammer excitation, adopt the constant excitation point, and the method for mobile test point is tested.Utilize the Impact Testing module of Test.Lab software to carry out the hammering modal test,, according to its vibration acceleration response of model pointwise test of setting up, obtain the frequency response function of each point.Then, utilize the PolyMAX technology of Modal Analysis module, extract each rank mode, obtain model frequency and Mode Shape.
With Modal Validation module, test result is carried out the mode modelling verification again, guarantee the accuracy of test result.
, with test result and simulation result comparative analysis (seeing also Fig. 7), determine the base plate modal parameter (seeing also Fig. 7) of the first situation.
In the inventive method, the specific implementation process of step B comprises:
Set up the three-dimensional entity model (the second situation sees also Fig. 2 c) of mounting guide rail base plate in Solidworks, its simulation flow is similar to the specific implementation process of above-mentioned steps A.Carry out the Modal Test test in base plate actual installation situation, all the other testing processs are similar to the specific implementation process of above-mentioned steps A., with test result and simulation result comparative analysis, determine the base plate modal parameter (seeing also Fig. 5) of the second situation.The result that the specific implementation process of net result and above-mentioned steps A is obtained is analyzed, for choosing of guide rail slide block provides foundation.
In the inventive method, the specific implementation process of step C comprises:
Set up the three-dimensional entity model (the third situation sees also Fig. 2 d) of multiaxis cascade base plate in Solidworks, simulation flow is similar to the specific implementation process of above-mentioned steps A.Carry out the Modal Test test in base plate actual installation situation, all the other testing processs are similar to the specific implementation process of above-mentioned steps A., with test result and simulation result comparative analysis, determine the base plate modal parameter (seeing also Fig. 6) of the third situation.The result that the specific implementation process of net result and above-mentioned steps A, B is obtained is analyzed, and for cascade form and structure joint stiffness, determines to provide foundation.
In the inventive method, the specific implementation process of step D comprises:
Set up the three-dimensional entity model (the 4th kind of situation, see also Fig. 2 e) that electric main shaft multiaxis cascade base plate is installed in Solidworks, simulation flow is similar to the specific implementation process of above-mentioned steps A.Carry out the Modal Test test in base plate actual installation situation, all the other testing processs are similar to the specific implementation process of above-mentioned steps A., with test result and simulation result comparative analysis, determine the base plate modal parameter (seeing also Fig. 6) of the 4th kind of situation.The result that net result and above-mentioned steps A, B, the specific implementation process of C are obtained is analyzed, for choosing of machining shaft part provides foundation.
compared with prior art, the method for designing of PCB rig multiaxis cascade structure of the present invention, adopt the vibration measurement instrument test analysis be combined with CAE emulation respectively to cascade structure basic part---base plate carries out Free Modal Analysis and emulation, the mounting guide rail base plate carries out model analysis and emulation, multiaxis cascade base plate carries out model analysis and emulation, electric main shaft multiaxis cascade base plate is installed is carried out model analysis and emulation, obtain the modal parameter of base plate in these four kinds of situations, these results are analyzed, for guide rail slide block, cascade form and structure joint stiffness, the choosing and determine to provide foundation of machining shaft part.This method has accurately, convenience is feasible, can obtain the dynamic perfromance of cascade base plate in assembling process, sets up a modal parameter system, is conducive to improve the dynamic design ability, obtains more excellent PCB rig multiaxis cascade structure.
Claims (7)
1. the method for designing of a PCB rig multiaxis cascade structure, base plate is divided into four kinds of different situations by the situation that associated components is installed on it, described four kinds of different situations comprise: the first situation is knocked-down base plate, the second situation is the base plate that is equipped with guide rail, the third situation is the base plate of multiaxis cascade, and the 4th kind of situation is the base plate that the multiaxis cascade of main electric axis is installed; It is characterized in that, the base plate employing vibration measurement instrument test analysis of each situation is combined and is carried out Free Modal Analysis and emulation with CAE emulation,, according to the Free Modal Analysis of the first situation and the result of emulation, directly obtain the design considerations of base plate itself; Contrast according to the result of the Free Modal Analysis of the second situation and the first situation and emulation, obtain the foundation that guide rail slide block is chosen; Contrast according to the result of the Free Modal Analysis of the third situation, the second situation and the first situation and emulation, obtain the foundation that cascade form and structure joint stiffness are chosen; , according to the contrast of the result of the Free Modal Analysis of the 4th kind of situation, the third situation, the second situation and the first situation and emulation, obtain the foundation of choosing of machining shaft part.
2. method for designing as described in claim l, is characterized in that, to the base plate of each situation, adopts the vibration measurement instrument test analysis to be combined the process of carrying out Free Modal Analysis and emulation with CAE emulation, comprises the following steps:
Set up a three-dimensional entity model of the base plate of corresponding situation at CAD software;
In corresponding three-dimensional entity model converting input CAE software, the definition material parameter is set, set up and test consistent
Boundary condition;
Emulation obtains the modal parameter of associated floor;
Adopt vibration measurement instrument to carry out test modal analysis to the base plate of corresponding situation, obtain the Modal Test result; And
, with test result and simulation result comparative analysis, determine the base plate modal parameter of corresponding situation.
3. method for designing as claimed in claim 2, is characterized in that, adopting vibration measurement instrument to carry out test modal analysis to the base plate of corresponding situation is to utilize a three dimensional taest model to test the base plate of corresponding situation.
4. method for designing as claimed in claim 3, it is characterized in that, the process of a three dimensional taest model of setting up the base plate of corresponding situation comprises: choose suitable energisation mode and arrange suitable response point on the base plate of this corresponding situation, according to the shape of the base plate of this corresponding situation and the response point of layout, set up this three dimensional taest model by the form of input coordinate in software, with the profile of the response point of probably depicting shape and layout.
5. method for designing as claimed in claim 3, it is characterized in that, in the process of utilizing this three dimensional taest model to test the base plate of this corresponding situation, position in the test point on the base plate of this corresponding situation is corresponding with the point on this three dimensional taest model of setting up, and the direction of test is also consistent with this three dimensional taest model direction of coordinate system in software.
6. method for designing as claimed in claim 3, it is characterized in that, describedly utilize a three dimensional taest model to test and comprise the base plate of corresponding situation: to set up the test boundary condition consistent with the emulation boundary condition, firmly hammer excitation, adopt the constant excitation point, the method for mobile test point is tested; The content measurement of each test point is excitation and vibration acceleration response, utilizes the method for modal parameter estimation to draw the test value of modal parameter.
7. method for designing as claimed in claim 2, is characterized in that, described process with test result and simulation result comparative analysis comprises: with the natural frequency of the base plate of the corresponding situation of simulate and test and Mode Shape contrast.
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| JPH11305819A (en) * | 1998-04-27 | 1999-11-05 | Hitachi Via Mechanics Ltd | Driller |
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| CN101574781A (en) * | 2009-03-20 | 2009-11-11 | 深圳市大族激光科技股份有限公司 | Design method of worktable underframe of PCB numerical control forming machine |
| CN102117357A (en) * | 2010-12-14 | 2011-07-06 | 深圳市大族激光科技股份有限公司 | Weight-reducing optimal design method for parts of PCB (printed circuit board) numerical control drilling and milling machine |
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