CN104317246A - Method for carrying out cutter back-off compensation on multi-shaft processing path of weak-rigidity cutter - Google Patents
Method for carrying out cutter back-off compensation on multi-shaft processing path of weak-rigidity cutter Download PDFInfo
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- CN104317246A CN104317246A CN201410432928.7A CN201410432928A CN104317246A CN 104317246 A CN104317246 A CN 104317246A CN 201410432928 A CN201410432928 A CN 201410432928A CN 104317246 A CN104317246 A CN 104317246A
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/404—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control arrangements for compensation, e.g. for backlash, overshoot, tool offset, tool wear, temperature, machine construction errors, load, inertia
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Abstract
The invention discloses a method for carrying out cutter back-off compensation on a multi-shaft processing path of a weak-rigidity cutter. According to the method, a relation between all cutter spacing multi-shaft processing actual speeds and cutter back-off amounts is taken into consideration to generate an overcut path in a reverse mode; and a weak-rigidity tool is used for carrying out cutter back-off deformation processing. The part dimension difference exceeding is effectively reduced or inhibited; the one-time moulding is ensured; multi-times repeated cutting is not required; and the processing efficiency and processing precision are guaranteed.
Description
Technical field
The present invention relates to CNC processing technology field, particularly relate to a kind of method of weak rigid blade arbor Multi-axis Machining path being carried out to cutter relieving compensation.
Background technology
Multi-axis NC milling, as a kind of cutting working method of high-precision high-efficiency, is widely used in fields such as Aero-Space, shipbuilding, automobile, moulds, especially exists in complex-curved parts machining, as blisk.And blisk demand is constantly increased along with aerospace industry, all kinds of blisk also emerges in an endless stream.Integrated impeller blade number is many, and runner is narrow, and blade overhangs long, and the cutter therefore for processing must carefully be grown, and cutter length-diameter ratio is very large, and cutter rigidity is weak.When carrying out blade finishing, easily there is serious cutter relieving phenomenon in weak rigid blade arbor, causes profile physical size to exceed the positivity bias of theoretical size, cause blisk defective.Wherein, cutter relieving refers in processing, and weak rigid blade arbor under cutting force effect, elasticity occurs and dodges, processing stand deviation theory machining path, causes finished surface generation compared with the phenomenon of big error.
At present, the serious cutter relieving phenomenon caused when Multi-axis Machining is carried out for weak rigid blade arbor, and cause the underproof problem of workpiece finishing size, in engineering, normal employing is repeatedly cut again or is reduced the methods such as feed rate to ensure and processes qualified part.In weak rigid blade arbor Multi-axis Machining, the method of repeatedly cutting again or fall feeding can eliminate milling ernr substantially, guarantee part is qualified, but this will make working (machining) efficiency become quite low, Repeated Cutting and low feeding all greatly extend actual process time, especially, when the blisk that machining blade number is more, the too low leaf dish processing allowing extremely to grow process time itself of efficiency cannot accept.Meanwhile, repeatedly cut the number of times being also difficult to hold Repeated Cutting again, some material can cause surface working to strengthen, and repeatedly cuts and can not reach dimensional requirement on the contrary, improves the roughness of finished surface on the contrary.In the processing of blisk, above-mentioned two kinds of methods more should not be used, because blisk material mostly is stainless steel for aviation and titanium alloy, difficulty of processing is large, actual machining period is long, according to repeatedly Repeated Cutting or the method for falling feeding, will make nearly double or more process time, this institute of Shi Yepan manufacturing enterprise is unacceptable.
Summary of the invention
The object of the invention is to, by a kind of method of weak rigid blade arbor Multi-axis Machining path being carried out to cutter relieving compensation, solve the problem that above background technology part is mentioned.
For reaching this object, the present invention by the following technical solutions:
Weak rigid blade arbor Multi-axis Machining path is carried out to a method for cutter relieving compensation, comprise the steps:
S101, generate finishing cutter track file according to the geometric configuration of part and technological parameter, and carry out postpositive disposal, finishing cutter track file transform is become numerical control program;
S102, carry out cutter relieving amount cutting experiment, obtain the cutting relieving amount of this kind of material when actual finishing cutting output under different feed rate, generate the experimental data table of feed rate F and relieving amount ε;
S103, line by line extraction is resolved to each axial coordinate and feed rate in the finishing numerical control program code line of step S101, obtain each axial coordinate of each point in machining path and nominal feed rate;
S104, each axial coordinate of all processing stands obtained according to step S103 calculate the displacement of each axle of each processing stand, and calculate resultant displacement amount;
S105, each point resultant displacement amount calculated according to machining path each point name feed rate and the step S104 of step S103 acquisition, with the limit feed rate of each axle of lathe for constraint, calculate the actual feed rate of each processing stand;
S106, according to feed rate in step S102 and relieving amount experimental data table, interpolation arithmetic is carried out to the actual feed rate of each processing stand that step S105 obtains, calculate the cutter relieving amount of each point under each actual feed rate;
S107, the finishing cutter track file generated by step S101 import in UG software, UG-CAD environment API function is used to carry out secondary development, the machining path each point relieving amount calculated according to step S106 to carrying out Contrary compensation, obtains the cutter spacing path after compensating to each cutter-contact point Surface Method of machining path;
S108, by step S107 compensate after cutter spacing path file carry out postpositive disposal, after converting numerical control G code to, input lathe, for the actual processing of part.
Especially, described step S102 specifically comprises: lathe three s functions cut square blank, fixedly mount laser range finder, setting feed rate F and processing cutting output, after cutter has cut at every turn, use laser range finder to read the range reading of face of tool, the difference of adjacent twice reading is each actual cut amount, compare with the cutting output of program setting, the cutter relieving amount ε under this feed rate F can be obtained; Different feed rates is set, each feed rate bottom tool relieving amount can be obtained, thus generate the experimental data table of feed rate F and relieving amount ε.
Especially, described step S105 specifically comprises:
The nominal feed rate of S1051, parsing extraction processing stand, according to the resultant displacement amount that step S104 obtains, the nominal feed time t in calculating processing path;
S1052, with the limit feed rate of each axle of lathe for constraint, according to each axial translation amount of the program feed path obtained in step S104, calculate lathe each axle respectively and complete time t required for this axial translation amount with limit feed rate
x, t
y, t
z, t
a, t
c.By t
x, t
y, t
z, t
a, t
ccompare with the nominal feed time t that calculates in step S1051 respectively, if be all less than or equal to t, then this section of actual feed rate of machining path is nominal feed rate; If t
x, t
y, t
z, t
a, t
cin there is numerical value and be greater than t, then get t
x, t
y, t
z, t
a, t
cin maximal value, be set to t
max, calculate the actual feed rate of this section of machining path;
S1053, successively step S1051 and step S1052 is performed to each processing stand, obtain the actual feed rate of all machining path sections.
Especially, described step S107 specifically comprises:
The cutter heart point coordinate that in S1071, calculating processing path, each point of a knife point is corresponding;
S1072, the processing cutter-contact point coordinate that acquisition machining path each point of a knife point is corresponding;
S1073, according to cutter-contact point Surface Method to, calculate the new cutter-contact point coordinate after Contrary compensation;
S1074, calculate new cutter heart point coordinate according to new cutter-contact point coordinate;
S1075, calculate new point of a knife point coordinate according to new cutter heart point coordinate;
S1076, step S1071 to S1075 is performed one by one to point of a knife point each in the finishing cutter track file generated in step S101, obtain all new point of a knife point coordinate after relieving amount Contrary compensation, replace the point of a knife point coordinate in former finishing cutter track file, obtain the cutter spacing path after compensating.
The method of carrying out cutter relieving compensation to weak rigid blade arbor Multi-axis Machining path that the present invention proposes considers the relation of each cutter spacing Multi-axis Machining actual speed and relieving amount, oppositely generated cutting knife road, utilize weak rigid blade arbor to process cutter relieving distortion effectively reduce or suppress accessory size overproof, guarantee one-shot forming, without the need to repeatedly cutting again, ensure that working (machining) efficiency and machining precision.
Accompanying drawing explanation
The method flow diagram weak rigid blade arbor Multi-axis Machining path being carried out to cutter relieving compensation that Fig. 1 provides for the embodiment of the present invention;
The cutter relieving amount cutting experiment platform schematic diagram that Fig. 2 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not full content.
Please refer to shown in Fig. 1, the method flow diagram weak rigid blade arbor Multi-axis Machining path being carried out to cutter relieving compensation that Fig. 1 provides for the embodiment of the present invention.
In the present embodiment, the method that cutter relieving compensation is carried out in weak rigid blade arbor Multi-axis Machining path is specifically comprised the steps:
S101, generate finishing cutter track file according to the geometric configuration of part and technological parameter, and carry out postpositive disposal, finishing cutter track file transform is become numerical control program.
Computer-aided manufacturing (Computer Aided Manufacturing, CAM) tool path planning software generates finishing cutter track file according to the geometric configuration of part and technological parameter.In cutter track file, each cutter location record is point of a knife dot information, and point of a knife point data row format is generally: GOTO/x, y, z, i, j, k, and wherein, x, y, z are point of a knife point position coordinates [xyz] under Cutter coordinate system
t, i, j, k are the generating tool axis vector [ijk] of its correspondence
t.Postpositive disposal is carried out to finishing cutter track file, is converted to nc program.In numerical control program, machining path each point represents point of a knife dot position information, and G code row format is: XX YY ZZ A θ
ac θ
cfF, wherein, X, Y, Z, θ
a, θ
crepresent five shaft position coordinates of this processing point of a knife point, F is its feed rate.
S102, carry out cutter relieving amount cutting experiment, obtain the cutting relieving amount of this kind of material when actual finishing cutting output under different feed rate, generate the experimental data table of feed rate F and relieving amount ε.
According to feed rate, relieving amount compensation is carried out to machining path, need to obtain the data relationship between relieving amount ε and feed rate F, so carry out cutter relieving amount cutting experiment.As shown in Figure 2, in figure, 201 is cutter to experiment porch schematic diagram, and 202 is blank, and 203 is laser range finder, and 204 is laser, and 205 is reader.Lathe carries out three axle cuttings, each feed cutting output δ
0for the cutting output of initial planning finishing cutter track, rotating speed S is identical with finishing, and feed rate F is experimental variable, chooses according to certain rule, and scope should comprise the minimum feed rate F that finishing is effectively cut
minwith maximum feed rate F
max, the position readings before and after laser range finder record cuts at every turn, difference is actual cut amount δ, then relieving amount ε=δ
0-δ.Choose different feed rate F to test, the relieving amount ε under different feed rate can be obtained, form the data relationship table of relieving amount ε and feed rate F, as shown in table 1, in table 1: S
essence, δ
essence, F
min, F
maxrepresent the rotating speed of Finishing Parts Machining, cutting output respectively, minimum feed rate when effectively cutting and maximum feed rate.In addition, the points for attention of experiment comprise following aspect: it is identical with part material to be processed that (I) tests square blank material; (II) test cutter for same and rotating speed consistent with during actual parts finishing; (III) cutting output is tested suitable with actual parts finishing cutting output; (IV) test feed rate to choose according to certain rules, and effective cutting feed rate that numerical control program in step S101 comprises should be comprised.(V) experiment should obtain relieving amount data as much as possible, can average by repetitive measurement.
Table 1
S103, line by line extraction is resolved to each axial coordinate and feed rate in the finishing numerical control program code line of step S101, obtain each axial coordinate of each point in machining path and nominal feed rate.
S104, each axial coordinate of all processing stands obtained according to step S103 calculate the displacement of each axle of each processing stand, and calculate resultant displacement amount.
The each axle of lathe, by the impact of limit feed rate, occurs that lathe cannot reach given feed rate sometimes, and can only, to be less than the situation that given feed rate is advanced, therefore need to calculate actual feed rate to compensate actual relieving amount better.Actual feed rate F
rcalculating, first to calculate the resultant displacement amount of each machining path section.The acquisition of each machining path section resultant displacement amount needs through following three steps: resolve and extract each axial coordinate and feed rate in finishing numerical control program code line, obtain each axial coordinate of each point in machining path and nominal feed rate.
S105, each point resultant displacement amount calculated according to machining path each point name feed rate and the step S104 of step S103 acquisition, with the limit feed rate of each axle of lathe for constraint, calculate the actual feed rate of each processing stand.
Nominal feed time is calculated one by one to each point resultant displacement amount that the machining path each point name feed rate obtained according to step S103 and step S104 calculate, and with the limit feed rate of each axle of lathe for constraint, judge that in processing, can each point in the name of be processed by feed rate, if can not, then calculate the actual feed rate of each point, if then namely nominal feed rate is actual feed rate, the final actual feed rate obtaining all processing stands;
S106, according to feed rate in step S102 and relieving amount experimental data table, interpolation arithmetic is carried out to the actual feed rate of each processing stand that step S105 obtains, calculate the cutter relieving amount of each point under each actual feed rate.
Contrary compensation is carried out by the relieving amount corresponding to all effective cutting feed rates of machining path, therefore the cutter relieving value under each feed rate of program is needed, and the feed rate selected by cutter relieving amount cutting experiment can not comprise all effective cutting feed rate in finishing numerical control program, so before carrying out machining path relieving amount Contrary compensation, need the actual relieving amount feed rate interpolation in finishing being calculated to its correspondence.
S107, the finishing cutter track file generated by step S101 import in UG software, UG-CAD environment API function is used to carry out secondary development, the machining path each point relieving amount calculated according to step S106 to carrying out Contrary compensation, obtains the cutter spacing path after compensating to each cutter-contact point Surface Method of machining path.
S108, by step S107 compensate after cutter spacing path file carry out postpositive disposal, after converting numerical control G code to, input lathe, for the actual processing of part.
Below for the blisk Multi-axis Machining that a certain blade rigid is stronger relative to process tool, illustrate and realize detailed process of the present invention (process tool is rose cutter).
First, according to the geometric configuration of integrated impeller blade and technological parameter in certain commercial CAM software, generate blade finishing cutter track file, and carry out postpositive disposal and convert numerical control program to.If the G code behavior XX of the n-th processing stand in numerical control program machining code
nyY
nzZ
na θ
anc θ
cnfF
n.
Then carry out cutter relieving amount cutting experiment, as shown in Figure 2, experimental result data is as shown in table 1 for experiment porch, the data relationship of record relieving amount ε and feed rate F.
After having tested, resolve each shaft position coordinate and nominal feed rate that extract each point of a knife point in numerical control program machining path, for the G code of n-th, according to keywords X, Y, Z, A, C, F extract this point of a knife point each shaft position coordinate X
n, Y
n, Z
n, θ
an, θ
cnwith nominal feed rate F
n.Successively this operation is performed to all processing stands of numerical control program, each shaft position coordinate of all points of a knife point and nominal feed rate can be obtained.
Then each axial translation amount of each section of feed path is calculated.From previous step, can obtain each shaft position coordinate of (n+1)th point in numerical control program machining path is X
n+1, Y
n+1, Z
n+1, θ
a (n+1), θ
c (n+1), then each axial translation amount of program n-th section of feed path is Δ X
n=X
n+1-X
n, Δ Y
n=Y
n+1-Y
n, Δ Z
n=Z
n+1-Z
n, Δ A
n=θ
a (n+1)-θ
an, Δ C
n=θ
c (n+1)-θ
cn.Computing successively, can obtain each axial translation amount of all job sequence route segments equally.
Arrive this, the resultant displacement amount of each machining path section can be calculated.The resultant displacement amount of n-th section of feed path is
calculate in order, the resultant displacement amount of all machining path sections of numerical control program can be obtained.
Calculate the actual feed rate of each processing stand below.The concrete steps that the actual feed rate of the n-th processing stand calculates are:
I () calculates the nominal feed time t of n-th section of machining path
n=dis
n/ F
n.
(ii) with the limit feed rate F of each axle of lathe
xlimf
ylimf
zlimf
alimf
climfor constraint, and according to numerical control program n-th section of feed path each axial translation amount Δ X
nΔ Y
nΔ Z
nΔ A
nΔ C
n, calculate lathe each axle respectively and complete time t required for this axial translation amount with limit feed rate
xn=Δ X
n/ F
xlim, t
yn=Δ Y
n/ F
ylim, t
zn=Δ Z
n/ F
zlim, t
an=Δ A
n/ F
alim, t
cn=Δ C
n/ F
clim.By t
xn, t
yn, t
zn, t
an, t
cnrespectively with the nominal feed time t that calculates in step (i)
ncompare, if be all less than or equal to t
n, then this section of actual feed rate of machining path is nominal feed rate t
n, i.e. actual feed rate F
rn=F
n; If t
xn, t
yn, t
zn, t
an, t
cnin there is numerical value and be greater than t
n, then t is got
xn, t
yn, t
zn, t
an, t
cnintermediate value the maximum, is set to t
nmax, calculate the actual feed rate F of this section of machining path
rn=dis
n/ t
nmax.
(iii) successively step (i) and step (ii) are carried out to each processing stand, the actual feed rate of all machining path sections can be obtained.
Then carry out interpolation operation, calculate the cutter relieving amount of each point under each actual feed rate.First according to relieving amount ε and the feed rate F data relationship table of the formation of cutter relieving amount cutting experiment, the actual feed rate F of retrieval judgement n-th processing stand
rnthe experiment feed rate interval [F fallen into
i, F
i+1], i.e. F
i≤ F
rn≤ F
i+1, F
i, F
i+1corresponding relieving amount is ε
i, ε
i+1, pass through interpolation formula
the n-th processing stand can be calculated at actual feed rate F
rnunder cutter relieving amount
one by one this computing is carried out to all processing stands, the cutter relieving amount of each point under its actual feed rate can be obtained.
Finally relieving amount Contrary compensation is carried out to machining path.Former finishing cutter track file is imported in UG software, performs UG-CAD environment API function secondary development plug-in unit, realize the Contrary compensation of machining path relieving amount.
The concrete methods of realizing of relieving amount Contrary compensation is as follows: the cutter heart point coordinate that first in calculating processing path, each point of a knife point is corresponding.Finishing cutter track file each cutter location record point of a knife dot information, if the n-th point of a knife dot information is x in cutter track file
nny
nnz
nni
nj
nk
n, first three parameter x
nn, y
nn, z
nnrepresent point of a knife point coordinate, rear three parameter i
nj
nk
nrepresent generating tool axis vector.Process tool is rose cutter, if the radius of rose cutter is R, calculates the cutter heart point coordinate (x that this point of a knife point is corresponding
cn, y
cn, z
cn), computing formula is x
cn=x
nn+ R*i
n, y
cn=y
nn+ R*j
n, z
cn=z
nn+ R*k
n.
Then the processing cutter-contact point coordinate that machining path each point of a knife point is corresponding is obtained.Cutter-contact point refers to the machining path cutter heart and presses Surface Method to the point coordinate projected on processed spoon of blade, is designated as (x
n, y
n, z
n).
Then according to cutter-contact point Surface Method to, calculate the new cutter-contact point coordinate after Contrary compensation.The aforementioned cutter relieving amount ε obtained under the actual feed rate of each processing stand
rn, pointwise is to machining path cutter-contact point (x
n, y
n, z
n) carry out Contrary compensation, compensation rate is relieving amount the opposite number (-ε of this point
rn), compensation direction is the normal direction of curved surface.If the n-th processing stand place curved surface normal vector is (i
cn, j
cn, k
cn), after compensating, new cutter-contact point coordinate is designated as (x
n1, y
n1, z
n1), computing formula is x
n1=x
n+ (-ε
rn) * i
cn, y
n1=y
n+ (-ε
rn) * j
cn, z
n1=z
n+ (-ε
rn) * k
cn.
According to new cutter-contact point coordinate reverse new cutter heart point coordinate.New cutter heart point coordinate is denoted as (x
cn1, y
cn1, z
cn1), computing formula is x
cn1=x
n1+ R*i
cn, y
cn1=y
n1+ R*j
cn, z
cn1=z
n1+ R*k
cn.
New point of a knife point coordinate is calculated again according to new cutter heart point coordinate.New point of a knife point coordinate is designated as (x
nn1, y
nn1, z
nn1), computing formula is x
nn1=x
cn1-R*i
n, y
nn1=y
cn1-R*j
n, z
nn1=z
cn1-R*k
n.
One by one above-mentioned computing is carried out to each point of a knife point in the former finishing cutter track file of CAM Software Create, obtains all new point of a knife point coordinate after relieving amount Contrary compensation, replace the point of a knife point coordinate in former finishing cutter track file one by one.So far, relieving amount Contrary compensation machining path process completes, and forms the finishing track file after compensating.Using the finishing track file after compensation as actual machining path file, carry out after postpositive disposal converts numerical control G code to, import in MIKRON UCP 800 lathe for integrated impeller blade finishing, the cutter milling ernr caused in the weak rigidity Multi-axis Machining of effective compensation, and qualified blade is obtained in time processing situation, also ensure that working (machining) efficiency, this has the technique effect improving crudy and ensure working (machining) efficiency in field of machining.
Technical scheme of the present invention considers the relation of each cutter spacing Multi-axis Machining actual speed and relieving amount, oppositely generated cutting knife road, utilize weak rigid blade arbor to process cutter relieving distortion effectively reduce or suppress accessory size overproof, guarantee one-shot forming, without the need to repeatedly cutting again, ensure that working (machining) efficiency and machining precision.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and can not protection scope of the present invention be departed from.Therefore, although be described in further detail invention has been by above embodiment, the present invention is not limited only to above embodiment, when not departing from the present invention's design, can also comprise other Equivalent embodiments more, and scope of the present invention is determined by appended right.
Claims (4)
1. weak rigid blade arbor Multi-axis Machining path is carried out to a method for cutter relieving compensation, it is characterized in that, comprise the steps:
S101, generate finishing cutter track file according to the geometric configuration of part and technological parameter, and carry out postpositive disposal, finishing cutter track file transform is become numerical control program;
S102, carry out cutter relieving amount cutting experiment, obtain the cutting relieving amount of this kind of material when actual finishing cutting output under different feed rate, generate the experimental data table of feed rate F and relieving amount ε;
S103, line by line extraction is resolved to each axial coordinate and feed rate in the finishing numerical control program code line of step S101, obtain each axial coordinate of each point in machining path and nominal feed rate;
S104, each axial coordinate of all processing stands obtained according to step S103 calculate the displacement of each axle of each processing stand, and calculate resultant displacement amount;
S105, each point resultant displacement amount calculated according to machining path each point name feed rate and the step S104 of step S103 acquisition, with the limit feed rate of each axle of lathe for constraint, calculate the actual feed rate of each processing stand;
S106, according to feed rate in step S102 and relieving amount experimental data table, interpolation arithmetic is carried out to the actual feed rate of each processing stand that step S105 obtains, calculate the cutter relieving amount of each point under each actual feed rate;
S107, the finishing cutter track file generated by step S101 import in UG software, UG-CAD environment API function is used to carry out secondary development, the machining path each point relieving amount calculated according to step S106 to carrying out Contrary compensation, obtains the cutter spacing path after compensating to each cutter-contact point Surface Method of machining path;
S108, by step S107 compensate after cutter spacing path file carry out postpositive disposal, after converting numerical control G code to, input lathe, for the actual processing of part.
2. method of weak rigid blade arbor Multi-axis Machining path being carried out to cutter relieving compensation according to claim 1, it is characterized in that, described step S102 specifically comprises: lathe three s functions cut square blank, fixedly mount laser range finder, setting feed rate F and processing cutting output, after cutter has cut at every turn, laser range finder is used to read the range reading of face of tool, the difference of adjacent twice reading is each actual cut amount, compare with the cutting output of program setting, the cutter relieving amount ε under this feed rate F can be obtained; Different feed rates is set, each feed rate bottom tool relieving amount can be obtained, thus generate the experimental data table of feed rate F and relieving amount ε.
3. the method for weak rigid blade arbor Multi-axis Machining path being carried out to cutter relieving compensation according to any one of claim 2 or 1, it is characterized in that, described step S105 specifically comprises:
The nominal feed rate of S1051, parsing extraction processing stand, according to the resultant displacement amount that step S104 obtains, the nominal feed time t in calculating processing path;
S1052, with the limit feed rate of each axle of lathe for constraint, according to each axial translation amount of the program feed path obtained in step S104, calculate lathe each axle respectively and complete time t required for this axial translation amount with limit feed rate
x, t
y, t
z, t
a, t
c.By t
x, t
y, t
z, t
a, t
ccompare with the nominal feed time t that calculates in step S1051 respectively, if be all less than or equal to t, then this section of actual feed rate of machining path is nominal feed rate; If t
x, t
y, t
z, t
a, t
cin there is numerical value and be greater than t, then get t
x, t
y, t
z, t
a, t
cin maximal value, be set to t
max, calculate the actual feed rate of this section of machining path;
S1053, successively step S1051 and step S1052 is performed to each processing stand, obtain the actual feed rate of all machining path sections.
4. method of weak rigid blade arbor Multi-axis Machining path being carried out to cutter relieving compensation according to claim 3, it is characterized in that, described step S107 specifically comprises:
The cutter heart point coordinate that in S1071, calculating processing path, each point of a knife point is corresponding;
S1072, the processing cutter-contact point coordinate that acquisition machining path each point of a knife point is corresponding;
S1073, according to cutter-contact point Surface Method to, calculate the new cutter-contact point coordinate after Contrary compensation;
S1074, calculate new cutter heart point coordinate according to new cutter-contact point coordinate;
S1075, calculate new point of a knife point coordinate according to new cutter heart point coordinate;
S1076, step S1071 to S1075 is performed one by one to point of a knife point each in the finishing cutter track file generated in step S101, obtain all new point of a knife point coordinate after relieving amount Contrary compensation, replace the point of a knife point coordinate in former finishing cutter track file, obtain the cutter spacing path after compensating.
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|---|---|---|---|
| CN201410432928.7A CN104317246B (en) | 2014-08-27 | 2014-08-27 | It is a kind of that the method for allowing knife to compensate is carried out to weak rigid blade arbor Multi-axis Machining path |
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|---|---|---|---|
| CN201410432928.7A CN104317246B (en) | 2014-08-27 | 2014-08-27 | It is a kind of that the method for allowing knife to compensate is carried out to weak rigid blade arbor Multi-axis Machining path |
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| CN108723888A (en) * | 2018-06-05 | 2018-11-02 | 西安交通大学 | Straight-line feed axis point of a knife point is relative to Grating examinations position deviation method of estimation |
| CN109396508A (en) * | 2018-11-02 | 2019-03-01 | 苏州千机智能技术有限公司 | Integrated impeller blade finishes three-dimensional knife compensating method |
| CN110426992A (en) * | 2019-08-08 | 2019-11-08 | 大连理工大学 | A kind of curved surface subregion contour parallel milling cutter path planing method |
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Application publication date: 20150128 Assignee: Jiangsu Jihui Huake Intelligent Equipment Technology Co., Ltd. Assignor: Wuxi research institute of the Central China University of Science and Technology Contract record no.: X2019980000288 Denomination of invention: Method for carrying out cutter back-off compensation on multi-shaft processing path of weak-rigidity cutter Granted publication date: 20170405 License type: Common License Record date: 20191023 |
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Application publication date: 20150128 Assignee: Jiangsu Pihe Advanced Manufacturing Technology Co.,Ltd. Assignor: Jiangsu Jihui Huake Intelligent Equipment Technology Co.,Ltd. Contract record no.: X2021980000719 Denomination of invention: A method of tool let compensation for multi axis machining path of weak rigid tool Granted publication date: 20170405 License type: Common License Record date: 20210125 |