CN104111625B - A kind of thin wall special-shaped part clamping deformation actively processing method - Google Patents
A kind of thin wall special-shaped part clamping deformation actively processing method Download PDFInfo
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- CN104111625B CN104111625B CN201410195511.3A CN201410195511A CN104111625B CN 104111625 B CN104111625 B CN 104111625B CN 201410195511 A CN201410195511 A CN 201410195511A CN 104111625 B CN104111625 B CN 104111625B
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Abstract
The invention discloses a kind of thin wall special-shaped part clamping deformation actively processing method, first the clamping force of thin-walled workpiece is optimized setting, then find out workpiece stress point scope, then workpiece is carried out auxiliary and supports, finally offset data is imported numerical control program.Compared with prior art, a kind of thin wall special-shaped part clamping deformation of the present invention actively processing method, can be analyzed before thin-wall part digital control processing, determine clamping power size, find clamping point and workpiece support point accurately, utilize increase and decrease cutter to mend, stablize the clamping of workpiece, reduce workpiece cutting deformation, improve precision further.
Description
Technical field
The present invention relates to a kind of work pieces process control method, particularly a kind of thin wall special-shaped part clamping deformation actively processing method.
Background technology
In thin-wall part part digital control processing, the clamping precision of part to be processed is to affect the crucial ring of part crudy and efficiency
One of joint.Owing to the wall thickness of thin-wall part especially large thin-wall profiled piece is little, poor rigidity, complex-shaped, easily send out during clamping
Raw moderate finite deformation, thus affect its machining accuracy, the conventional thin-wall part course of processing, the not work flow of complete set,
In order to reduce machining deformation, use most methods namely to use the mode repeatedly corrected, but this can not fundamentally be avoided
Deformation.When Study of Thin wall pieces clamping, need to study the factor that may produce clamping deformation in all its bearings, the most just can have
Imitate avoids workpiece, the particularly deformation of thin-wall workpiece.
Summary of the invention
The technical issues that need to address of the present invention are for above-mentioned the deficiencies in the prior art, and provide the one can be to thin-wall part clamping
Deformation realizes actively controlling, mainly by the flow of metal property analysis of thin wall type workpiece and clamping force, the determination of cutting force,
Thus carrying out workpiece support targetedly, the change that in processing route, cutter is mended improves the high accuracy of thin wall type workpiece cutting,
Big degree avoid flow of metal, the further strengthening Cutting Process to thin wall type workpiece.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
A kind of thin wall special-shaped part clamping deformation actively processing method, it is characterised in that: comprise the following steps.
A. clamping thin sheet wall pieces, analyzes thin-wall part pressure experienced, support reaction and frictional force according to force vector and momental equation, calculates
Go out the thin-wall part scope by minimum grip power, and take one of them numerical value as initial clamping force numerical value；Analyze thin-wall part institute
Pressure experienced, support reaction and frictional force, rough calculation goes out the initial clamping force of thin-wall part；B. at initial clamping force numerically
Increase some different size of clamping forces respectively as clamping force numerical value to be analyzed；Based on initial clamping force, increase with certain
Thin-wall part is set up finite element assembling model analysis by the selected some clamping force numerical value C. to be analyzed of amount, simulates thin-wall part
Clamping maximum weighted point, and the normal direction clamping power scope of clamping contact surface and tangential clamping power scope；Foundation meets actual dress
The finite element assembling model of folder situation, arranges suitable boundary constraint and contact, checks Finite element analysis results, extracts contact
Normal direction between face and tangential contact force；D. it is analysed to clamping force numerical value and brings the normal direction clamping power scope simulated into tangential
Clamping power scope is screened, and i.e. selects clamping force numerical value to be analyzed to have with normal direction clamping power scope and tangential clamping power scope
Numerical value；E. the clamping force number to be analyzed after screening is joined and process safety coefficient calculates and screens, draw final clamping
Power；F. machine cut power is substituted into final clamping force, set up finite element analysis model, analyze the deformation range of thin-wall part also
Select least amount of deformation, final clamping force and machine cut masterpiece are gone out regulation and meets the least amount of deformation of thin-wall part；Judgement adds
Whether work deformation values meets processing request, if being unsatisfactory for, readjusts clamping force and cutting force；G. the limited of thin-wall part is set up
Meta-model, analyzes the machining deformation maximum region of thin-wall part；H. auxiliary is set in the machining deformation maximum region of thin-wall part
Prop up stake tool, thin-wall part workpiece deformation is adjusted to minimum；I. software analysis is utilized to go out thin-wall part under the conditions of clamping,
The deformation data at each position, and data are added cutter compensation, import in numerical control program.
As further preferred version, during in described step A, initial clamping force numerical value takes the scope of minimum grip power in
Between numerical value.
As further preferred version, described step B adds some different size of clamping forces, its power increased
For 5N-30N.
As further preferred version, in described step H, auxiliary stake tool is multiple spot clamping bench vice.
As further preferred version, the software in described step I is ABAQUS.
Compared with prior art, a kind of thin wall special-shaped part clamping deformation of the present invention actively processing method, can be at thin-walled number of packages
It is analyzed before control processing, determines clamping power size, find clamping point and workpiece support point accurately, regulate cutting force, utilize increase and decrease
Cutter is mended, and stablizes the clamping of workpiece, reduces workpiece cutting deformation, improves precision further.
Accompanying drawing explanation
Fig. 1 is the general flow chart of the present invention；
Fig. 2 is that in the present invention, clamping force optimizes calculation flow chart；
Fig. 3 is clamping force and cutting force Optimized Matching flow chart in the present invention；
Fig. 4 is auxiliary support position optimization flow chart in the present invention；
Fig. 5 is clamping error compensation flow chart in the present invention.
Detailed description of the invention
Describe the preferred technical solution of the present invention below in conjunction with the accompanying drawings in detail.
A kind of thin wall special-shaped part clamping deformation of the present invention actively processing method includes that clamping force optimization calculates, assists Support Position
Optimizing calculating, clamping deformation actively precompensation, concrete operations flow process is as shown in Figure 1.
Fig. 2 show clamping force based on Finite Element Method in the present invention and optimizes calculation process.
Step A-E step:
Step 210: use rational mechanics relevant knowledge, uses force vector and torque equilibrium equation, analyzes suffered by thin-wall part
Pressure, support reaction and frictional force, rough calculation goes out the initial clamping force of thin-wall part.
Step 220: based on initial clamping force, selectes some clamping force numerical value to be analyzed with certain increment.
Step 230: based on ABAQUS software, set up the finite element assembling model meeting actual clamping situation, it is suitable to arrange
Boundary constraint and contact.
Step 240: check Finite element analysis results, extracts the normal direction between contact surface and tangential contact force.
Step 250: according to the normal direction drawn and tangential contact force, it may be judged whether meet clamping constraints, if being unsatisfactory for,
Returning step 220, if meeting, pointing to step 260, the power suffered by workpiece includes between clamping force, clamping element and workpiece
The gravity of frictional force, cutting force and workpiece itself, can obtain following relational expression:.
Step 260: the clamping force drawn according to finite element analysis, selected suitable safety coefficient, both are finally by product
The clamping force value optimized.
The force equation related in step A-E has:
Force vector and torque equilibrium equation, formula is as follows
min(max(|Δ1|,|Δ2|,...,|Δn|)),
In formula, ΔiRepresent the clamping deformation value at each control point of workpiece,WithRepresent the normal direction contact force between clamping element i and workpiece and tangential contact force, μiRepresent clamping element i and workpiece it
Between coefficient of friction.
Mechanical equation formula is as follows
∑MO=FC*h-f*L
F=μ * F
In formula, FCRepresenting cutting force, h represents cutting force height, and f represents friction of workpiece power, and L represents workpiece height, F
Represent workpiece clamp clamp force.
The calculating standard of process safety coefficient is as follows
K=K0*K1*K2*K3
In formula, K0For basic security coefficient, typically take 1.2～1.5, K1For working properties factor, roughing takes 1.2,
1.0, K are taken during polish2For cutting tool dulling factor, span 1.1～1.3, K3For cutting characteristic factor, add continuously
Man-hour takes 1.0, and discontinuously processing takes 1.2.
Fig. 3 is to combine genetic algorithm in the present invention to realize the optimization calculation process that clamping force is mated with cutting force.
F step:
Step 310: based on the clamping force that step 260 draws, determines dynamic clamping force scope under this station；Tie simultaneously
Close actual processing and determine cutting force excursion.
Step 320: the contact force drawn according to analysis, it may be judged whether meet clamping constraints, consider working (machining) efficiency simultaneously
Etc. factor, it is judged that relevant cutting parameters is the most practical, if being unsatisfactory for, adjust clamping force and cutting force.
Step 330: obtain part deformation situation based on finite element analysis, it is judged that whether machining deformation value meets processing request,
If being unsatisfactory for, readjust clamping force and cutting force.
Step 340: judge that object function has reached convergence the most by genetic algorithm, if meeting, exports final result.
Fig. 4 show in the present invention auxiliary support position optimization flow process.
G step H step:
Step 410: set up the FEM (finite element) model of workpiece, arranges suitable boundary condition, loads cutting Force Model, is not adding
Auxiliary analyzes the maximum region of work pieces process deformation and maximum deformation value in the case of supporting.
Step 420: according to analyzing the work pieces process deformation maximum region drawn in step 410, symmetry is chosen in this region
Some suitable auxiliary strong points.
Step 430: add auxiliary on the auxiliary strong point selected at step 420 and support, is carried out work pieces process deformation point
Analysis, draws maximum deformation value.
Step 440: obtaining adding the workpiece maximum deformation value after auxiliary supports according to finite element analysis, supporting if adding auxiliary
Rear maximum deformation value does not reaches minimum, then return step 420, is adjusted auxiliary Support Position, final selected suitable
Support position.
Fig. 5 is the thin-wall part clamping error compensation flow chart in the present invention.
I step:
Step 510: being applied to clamp force value is step 260 gained optimum clamping force.
Step 520: it is step 440 gained optimal location that auxiliary supports applying position.
Step 530: use finite element method based on ABAQUS software, analyzes and draws in step 510, described in 520
Under the conditions of clamping, the clamping deformation value at the upper each control point of to be processed of workpiece.
Step 540: by each point clamping deformation data of step 530 gained, determine the benefit of each point according to the compensation method used
Repay value.
Step 550: each point offset obtained based on step 540, revises numerical control program, pre-compensates for clamping deformation.
Claims (5)
1. a thin wall special-shaped part clamping deformation actively processing method, it is characterised in that: comprise the following steps
A. clamping thin sheet wall pieces, analyzes thin-wall part pressure experienced, support reaction according to force vector and momental equation and rubs
Wiping power, calculates the thin-wall part scope by minimum grip power, and takes one of them numerical value as initially
Clamping force numerical value；
B. some different size of clamping forces are increased the most respectively as clamping to be analyzed at initial clamping force
Power numerical value；
C. thin-wall part is set up finite element assembling model analytical data, simulates the clamping maximum weighted of thin-wall part
Point, and the normal direction clamping power scope of clamping contact surface and tangential clamping power scope；
D. it is analysed to clamping force numerical value and substitutes into the normal direction clamping power scope and tangential clamping power scope simulated
Carry out screening the part with common numerical value；
E. the clamping force numerical value to be analyzed after screening is joined and process safety coefficient calculates and screens, draw
Final clamping force；
F. machine cut power is substituted into final clamping force, set up finite element analysis model, analyze the change of thin-wall part
Shape scope also selects least amount of deformation, final clamping force and machine cut masterpiece is gone out regulation, meets thin
The least amount of deformation of wall pieces；
G. set up the FEM (finite element) model of thin-wall part, analyze the machining deformation maximum region of thin-wall part；
H., auxiliary stake tool is set in the machining deformation maximum region of thin-wall part, thin-wall part clamping deformation
It is adjusted to minimum；
I. software analysis is utilized to go out thin-wall part under the conditions of clamping, the deformation data at each position, and data are added
Enter cutter compensation, import in numerical control program.
A kind of thin wall special-shaped part clamping deformation actively processing method the most according to claim 1, it is special
Levy and be: the centre during initial clamping force numerical value takes the scope of minimum grip power in described step A
Numerical value.
A kind of thin wall special-shaped part clamping deformation actively processing method the most according to claim 1, it is special
Levying and be: add some different size of clamping forces in described step B, its power increased is
5N-30N。
A kind of thin wall special-shaped part clamping deformation actively processing method the most according to claim 1, it is special
Levy and be: in described step H, auxiliary stake tool is multiple spot clamping bench vice.
A kind of thin wall special-shaped part clamping deformation actively processing method the most according to claim 1, it is special
Levy and be: the software in described step I is ABAQUS.
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| CN109581971A (en) * | 2017-09-28 | 2019-04-05 | 中国商用飞机有限责任公司 | The deformation control method of aircraft entirety escape door numerical control processing |
| CN107657129B (en) * | 2017-10-17 | 2019-12-20 | 西北工业大学 | Thin-wall part residual stress deformation perception prediction method based on clamping force monitoring |
| CN108296723A (en) * | 2018-02-12 | 2018-07-20 | 东南大学-南京生物材料与医疗器械研究所 | Thin-walled parts processing method |
| CN108519759B (en) * | 2018-04-12 | 2020-11-03 | 佛山金皇宇企业孵化器有限公司 | Length compensation method for saw-cut section of cutting machine tool |
| CN110919459B (en) * | 2019-12-06 | 2020-10-16 | 沈阳航空航天大学 | Method for detecting influence of clamping force on machining deformation of thin-wall part |
| CN112427890A (en) * | 2020-11-09 | 2021-03-02 | 中国船舶重工集团公司第七二四研究所 | Method for eliminating fine deformation in batch forming of slender thin-wall crack line source |
| CN113084456A (en) * | 2021-04-02 | 2021-07-09 | 山东泰和能源股份有限公司 | Processing technology of aluminum alloy thin-wall shell |
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| DE2344866A1 (en) * | 1973-09-06 | 1975-03-20 | Bellaplast Gmbh | METHOD AND DEVICE FOR MANUFACTURING MOLDINGS BY THERMOFORMING |
| JPS5867430A (en) * | 1981-10-19 | 1983-04-22 | Hitachi Ltd | Injection control method of injection molding machine |
| DE4300643A1 (en) * | 1993-01-13 | 1994-07-14 | Innovative Fertigungstechnolog | Positioning and retention of deformation-sensitive workpiece |
| CN101543949B (en) * | 2009-04-30 | 2010-09-22 | 上海大学 | Rapid gripping device manufacturing method based on rapid prototyping process |
| CN102179708B (en) * | 2011-03-09 | 2013-06-05 | 浙江大学宁波理工学院 | Multipoint profiling rigid clamp and method for processing thin-wall workpiece by using same |
| CN102354161A (en) * | 2011-06-22 | 2012-02-15 | 上海电机学院 | Finite element compensation method for deformation of numerical control processed part |
| CN102615520A (en) * | 2012-03-30 | 2012-08-01 | 浙江大学宁波理工学院 | Composite material thin-walled piece clamp and method for processing composite material by using clamp |
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