CN102096391B - Cutter path generating method for double blade head processing of turbine long blade profile - Google Patents

Cutter path generating method for double blade head processing of turbine long blade profile Download PDF

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CN102096391B
CN102096391B CN201010579065A CN201010579065A CN102096391B CN 102096391 B CN102096391 B CN 102096391B CN 201010579065 A CN201010579065 A CN 201010579065A CN 201010579065 A CN201010579065 A CN 201010579065A CN 102096391 B CN102096391 B CN 102096391B
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cutter
blade
reference mark
spacing reference
processing
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CN102096391A (en
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赵万华
位文明
董襄阳
余常武
卢秉恒
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Xian Jiaotong University
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Xian Jiaotong University
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Abstract

The invention discloses a cutter path generating method for double blade head processing of a turbine long blade profile. The method comprises the following steps: firstly establishing a corresponding mathematical relation between cutting force and cutter shaft inclinations during blade processing so as to obtain a cutting force model of the blade processing; then acquiring section moulded line data of a blade, and determining the range of cutter location control point data of double blades in the section moulded lines of the blade, wherein the cutter location control point data comprise the step length between cutter location control points, the number of the cutter location control points and the cutter shaft inclination of a cutter at each corresponding cutter location control point; and finally determining the final offset effect of the cutting force. In the invention, the double blade head can simultaneously process parts, and the processing efficiency is obviously improved compared with a single blade by reasonably scheduling the processing technique on the parts; and besides, the double blade processing can ensure the cutting force to be greatly offset, thus the processing deformation of the parts is obviously reduced.

Description

The cutter path generation method of the double-pole hair style processing of steam turbine linear leaf profile
Technical field
The invention belongs to the Machining Technology field, relate to a kind of processing of steam turbine linear leaf profile, especially a kind of cutter path generation method of double-pole hair style processing of steam turbine linear leaf profile.
Background technology
Turbine blade generally is made up of blade root, blade, shroud, lacing wire and transition portion.Blade root is the part that blade installs and fixes, and blade is the part that blade has blade profile, and the height of blade profile quality is directly determining the work quality of blade and the performance of steam turbine.The work under bad environment of blade is being born the centrifugal force that high temperature, high pressure, high rotating speed brings and the corrosive attack of high-temperature steam in the work.For the performance that guarantees steam turbine and the security of equipment, Steam Turbine Blade Materials all is professional steel, and hardness is more than 360HB, and processability is relatively poor.In order to guarantee the high-level efficiency of steam turbine, the blade partial design becomes a smooth space curved surface simultaneously, and its accuracy requirement is high, and difficulty of processing is big.Blade kind in the steam turbine is a lot, and dissimilar blades is different because of performance requirement, and very big difference is arranged on material and structure, causes its job operation to have very big gap thus.Linear leaf structure in the steam turbine is the most complicated, and difficulty of processing is also maximum.Compare with common blade, respectively there is a boss in the centre position of linear leaf blade on interior convex profile.The blade root fillet is very complicated compound curved surface, each position on the blade height direction, and its radius value changes, and this has brought certain degree of difficulty for the moulding and the processing of blade root fillet.
The length breadth ratio of linear leaf is big, and the cross section is complicated, its add man-hour characteristic and thin and long shafts part similar place is arranged.Slender axles (length-diameter ratio＞20) type part strength and rigidity are poor, are adding the influence that receives own wt, cutting force and heat in metal cutting man-hour, very easily produce vibration and distortion, and crudy is difficult to guarantee, even causes the part processing process to interrupt.General longaxones parts adds to adopt man-hour and adds centre frame or follow-rest carries out supplemental support to part.Through increasing rational auxiliary support structure form, perhaps select rational cutter and cutting data can improve the machining precision of part to a certain extent.This mode is suitable for processing that length-diameter ratio is big, the uncomplicated axial workpiece in cross section.But the steam turbine linear leaf is difficult to process in this way.Blade profile is the complex space curved surface, and the cross section is complicated, and normal other structures in addition in surface are difficult in the process it is increased supplemental support.In the actual processing, often adopt technological parameters such as rational process tool and cutting data to improve the crudy of part.
At present, the main numerical control machining center of five-axle linkage that adopts of the profile of linear leaf processing is processed, and No. one time clamping just can be accomplished blade profile, interior back of the body arc boss, blade root knuckle, integral shroud knuckle and the isostructural processing of integral shroud fitting surface molded lines.But the numerical control machining center of five-axle linkage all is to adopt hilted broadsword to process blade.When adopting hilted broadsword processing linear leaf, particularly in the roughing stage, cutting data is big, and working (machining) efficiency is low; In process, linear leaf is equivalent to the fixing beam in two ends, in the time of above cutter acts on; Because blade rigid is relatively poor, very easily under the effect of cutting force, bends and torsional deflection, produces local warpage; " cutter relieving " phenomenon occurs, influence machining precision.The nc program of numerical control machining center can not be eliminated the influence of cutting force to the blade processing precision in writing.For distortion is to the influence of precision of blades in reducing to process, the strategy of taking at present mainly contains two aspects.On structural design, through improving the structure of boss, the stress of improving blade is to reduce the distortion in the process; In process, adopt technological parameters such as rational process tool, cutting data according to the processing experience and cutter path compensated and improve the processing of leaves precision.
The planning content of processing blade cutter path mainly comprises the selection of cutter path, the confirming of line-spacing, the direction of feed step-length confirm etc. that the cutter path of generation is actually the curve of one group of envelope spoon of blade.
In the blade processing, the existing application of the system of selection of cutter path helical milling method more widely also has capable butt formula.Which kind of feed path mode no matter, process all comprises both direction, i.e. line-spacing direction and direction of feed.
There is confidential relation in the size of line-spacing with the residual height of blade surface, the method for generally confirming line-spacing mainly contain etc. parametric method with etc. residual height method since etc. residual height method can guarantee that residual height everywhere is even basically, thereby range of application is wider.
Because the restriction of CNC interpolation ability, the cutter path of curve can only be approached with some small straight-line segments.In the process, being moved as piecewise linearity by lathe is approximated to deltoid, thereby always can have mismachining tolerance.When generating the processing step-length, need control step-length, satisfy accuracy requirement to guarantee linear interpolation.Parameter step length methods such as the method for more common definite processing step-length has, etc. chord length step-length method and equal error step-length method.The size of step-length has directly influenced size and the working (machining) efficiency of crudy, numerical control program.The equal error method can obtain maximum step-length under the prerequisite that guarantees the mismachining tolerance scope, obtain higher working (machining) efficiency, thereby more often use.
The cutter path that generates is actual to comprise center cutter point coordinate and generating tool axis vector by cutter spacing reference mark data representation, is expressed as three coordinate figures of center cutter point and the cosine of generating tool axis vector three directions under workpiece coordinate system.
Existing cutter path generation method all is to propose to the hilted broadsword processing mode, and the track that how to generate both sides cutter in the double-pole processing does not propose a kind of effective method to confirm the corresponding relation at cutter spacing reference mark, both sides.As the method that adopts hilted broadsword to generate cutter path confirms the cutter spacing reference mark data of double-pole processing, though but the meeting geometric error requirements is not sure of the processing corresponding relation of both sides cutter, can not embody the advantage that double-pole is processed.
General cutter path generation method all is to satisfy the requirement of mismachining tolerance from the angle of geometric relationship, and cutter path is not taken into account the influence of cutting force.Majority considers that the method for cutting force influence also is to improve the influence of cutting force from the aspect that changes speed of feed, does not control cutting force from the angle that generates cutter spacing reference mark data.When double-pole processing generated cutter path, as not considering the influence of cutting force, the neutralization effect of the cutter path cutting force of generation was not necessarily optimal, as considered improperly, even the possibility that increases the blade processing distortion was arranged.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned prior art; A kind of cutter path generation method of double-pole hair style processing of steam turbine linear leaf profile is provided; This method is processed in linear leaf profile both sides through double-pole simultaneously, the suffered cutting force of blade is partly or entirely offset, thereby can effectively improve the stress of linear leaf profile in process; Reduce the machining deformation amount of linear leaf profile, and can improve working (machining) efficiency.
The objective of the invention is to solve through following technical scheme:
The cutter path generation method of the double-pole hair style processing of this kind steam turbine linear leaf profile specifically may further comprise the steps:
1) establishes cutting Force Model
At first, set up cutting force, obtain the cutting Force Model of blade processing with the corresponding mathematical relation between the cutter shaft inclination angle in the blade processing;
2) the cross section molded lines data of acquisition blade
Confirm that the high direction of leaf is processing line-spacing direction; Be the processing direction of feed along the blade profile molded lines, both sides tool feeding direction is consistent, promptly all by leading edge to lagging edge; Or lagging edge is processed to leading edge; Line-spacing according to leaf three-dimensional model and line-spacing, obtains blade profile molded lines data by waiting row pitch method to confirm;
3) confirm cutter spacing reference mark data area in each cross section
Confirm the cutter spacing reference mark data span of double-pole in the blade profile molded lines, said cutter spacing reference mark data comprise the number at step-length between the cutter spacing reference mark, cutter spacing reference mark and the cutter shaft inclination angle of place, each corresponding cutter spacing reference mark cutter;
4) confirm the neutralization effect of final cutting force
The neutralization effect of at first confirming cutting force is with the relation between three kinds of cutter spacing reference mark data areas, and the neutralization effect of said cutting force is that the double-pole head adds man-hour, and the double-pole head acts on the neutralization effect of making a concerted effort on the blade to be processed; In three kinds of cutter spacing reference mark data areas that step 3) obtains; Choose the number at step-length, cutter spacing reference mark between best cutter spacing reference mark and the value that the cutter shaft inclination angle of cutter is located at each corresponding cutter spacing reference mark, make the double-pole head act on the minimum of making a concerted effort on the blade to be processed.
Above step 2) in, definite method of line-spacing is: on the direction high along leaf, and equidistant intercepting blade profile, the distance between the two adjacent blades cross sections is line-spacing.
In the above step 3), through to blade profile molded lines linear interpolation, the distance between the two cutter spacing reference mark, front and back that obtain is a step value, the maximal value L of step-length between the cutter spacing reference mark MaxBy maximum linear interpolation error delta MaxConfirm to obtain, the minimum value of step-length is kL Max(0＜k＜1), the concrete value of k during according to blade processing machining precision and require process time to confirm.
In the above step 3), be limited under the value of said cutter spacing reference mark number: carry out linear interpolation and step-length when getting maximal value at leaf basin and blade back curve, the higher value of the cutter spacing reference mark number that leaf basin and blade back curve obtain respectively; Be limited on the value of said cutter spacing reference mark number: carry out linear interpolation and step-length when getting minimum value at leaf basin and blade back curve, the smaller value of the cutter spacing reference mark number that leaf basin and blade back curve obtain respectively.In addition, in step 3), with the cutter shaft of the cutter angle that tilts, cutter shaft and the hands-off condition of blade need be satisfied in the angle of inclination of said cutter shaft, obtain the cutter shaft inclination angle scope of each place, cutter spacing reference mark cutter at last.
In the above step 4), the concrete obtaining value method at the cutter shaft inclination angle of the number at step-length, cutter spacing reference mark and each corresponding cutter spacing reference mark place cutter is between the cutter spacing reference mark on each blade profile:
To an initial value of number at step-length between the cutter spacing reference mark and cutter spacing reference mark,, confirm the span at cutter shaft inclination angle at first respectively according to these two initial values; Thus, obtain the cutting force optimal synthesis neutralization effect formula (1-1) of whole cross section under this cutter spacing reference mark number and step-length value scheme
F → = Σ 1 n F → i - - - ( 1 - 1 )
In the formula,
---double-pole head acts on total the making a concerted effort on the blade to be processed;
Figure BDA0000036929440000063
---the double-pole head acts on the blade to be processed, and i makes a concerted effort to the cutting force of corresponding cutter location;
N---the number at cutter spacing reference mark;
The comprehensive neutralization effect of cutting force when the number at the cutter spacing reference mark of more different values and step-length; The cutter spacing reference mark number and the step value that are made
Figure BDA0000036929440000064
and hour adopted; And obtain the cutter shaft inclination angle value at cutter spacing reference mark, confirm three parameters of cutter path planning thus.
The present invention has following beneficial effect:
1) significantly improves working (machining) efficiency.The double-pole head can be processed part simultaneously, and through the processing technology of rational arrangement part, working (machining) efficiency obviously increases than hilted broadsword head;
2) reduce the distortion of linear leaf work in-process.Concerning linear leaf, it is very big adding the distortion that causes because of cutting force man-hour, when particularly cutting output is very big.This distortion has very big influence to the Accuracy of finish of part.To axial workpiece, the distortion in can reducing to process through the mode that increases intermediate supports, but for the irregular steam turbine linear leaf in cross section, it is very difficult increasing support.Job operation through the double-pole head; In process, reasonably arrange the position of two cutters; The cutting force that makes cutter act on the part can access a part or even counteracting fully; The advantage that this can give full play to double-pole processing blade reduces the distortion of part significantly, improves the part processing quality.
Description of drawings
Fig. 1 is the work synoptic diagram of double-pole processing blade of the present invention;
Fig. 2 is the blade stress analysis figure of Fig. 1;
Fig. 3 is the processing tool path pattern synoptic diagram of leaf pelvic curvature face;
Fig. 4 is the processing tool path pattern synoptic diagram of blade back curved surface;
Fig. 5 adds the direction of feed synoptic diagram of cutter in man-hour for double-pole;
Fig. 6 is for confirming the synoptic diagram of cutter spacing reference mark number;
Fig. 7 is for confirming the synoptic diagram of step-length between the cutter spacing reference mark.
Wherein: 1,2 is main tapping; 3 is blade to be processed; 4,5 is cutter; 6 is the direction of feed of blade processing; 7 is the line-spacing direction of blade processing; 8 is cutter path; 9 is the leaf pelvic curvature face of blade to be processed; 10 is the blade back curved surface of blade to be processed; 11 is the blade back curve of blade to be processed; 12 is the leaf pelvic curvature line of blade to be processed.
Embodiment
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:
With reference to Fig. 1, the principle of work of double-pole head processing blade is following: adding man-hour, the main tapping 1 that has a cutter and main tapping 2 are respectively in profile two lateral movements of blade 3 to be processed.The motion of two main tappings is controlled by two independent motions, and coordinates through total control system.
The cutter path planing method practical implementation step of double-pole processing is following:
1) establishes cutting Force Model
At first, set up cutting force, obtain the cutting Force Model of blade processing with the corresponding mathematical relation between the blade processing cutter shaft inclination angle.Because double-pole process tool trajectory planning is based on cutting Force Model, it is very crucial therefore to set up the model that can accurately predict cutting force in the blade processing.Cutter according to the processing blade is selected for use is different, both can set up empirical model through experiment, also can obtain the cutter shaft inclination angle with the relation between the cutting force through theoretical analysis, confirms key parameter wherein in conjunction with experiment, sets up cutting Force Model.A kind of main cutting force model is provided: here on existing main cutting force model based; Through setting up the cutter shaft inclination angle with the relation between the cutting data; Revise the parameter of cutting data in the main cutting force model; Introduce the cutter shaft inclination angle in the main cutting force model, obtain the cutter shaft inclination angle with the relation between the cutting force, thereby set up cutting Force Model.
2) the cross section molded lines data of acquisition blade
With reference to Fig. 3 and Fig. 4, confirm that the high direction of leaf is processing line-spacing direction 7, along the blade profile molded lines for processing direction of feed 6, with reference to Fig. 5, both sides tool feeding direction 6 unanimities, promptly all by leading edge to lagging edge, or lagging edge is processed to leading edge; Line-spacing is by waiting row pitch method to confirm, i.e. distance between the blade processing cutter path cutting row equates; In 3 d modeling software,, obtain blade profile molded lines data by waiting row pitch method intercepting leaf three-dimensional model.Definite method of line-spacing is: on the direction high along leaf, and equidistant intercepting blade profile, the distance between the two adjacent blades cross sections is line-spacing.
3) confirm cutter spacing reference mark data area in each cross section
Obtain cutter spacing reference mark data through the blade profile molded lines being carried out linear interpolation.In the cutter path planing method of double-pole processing blade, cutter spacing reference mark data comprise the step-length between the cutter spacing reference mark, the number at cutter spacing reference mark and the cutter shaft inclination angle of place, each corresponding cutter spacing reference mark cutter; Confirm the cutter spacing reference mark data area in each cross section, can lay the foundation for the cutting force neutralization effect of optimizing double-pole processing blade.
With reference to Fig. 6, through to the interpolation of blade profile molded lines, front and back two cutter spacing reference mark A that obtain and the distance between the B are step value, the maximal value L of step-length between the cutter spacing reference mark MaxBy maximum linear interpolation error delta MaxConfirm to obtain, the minimum value of step-length is kL Max(0＜k＜1), the concrete value of k during according to blade processing machining precision and require process time to confirm.
During blade profile molded lines interpolation, according to the difference of getting step value, the number that obtains the cutter spacing reference mark is also different; In the double-pole processing blade method, the neutralization effect of cutting force when processing blade for optimizing double-pole is with reference to Fig. 7, during blade profile molded lines interpolation, through changing linear interpolation error δ 1i, δ 2i, δ 1jAnd δ 2j, make blade back identical with the cutter spacing reference mark number that leaf pelvic curvature line interpolation obtains.Be limited under the value of said cutter spacing reference mark number: carry out linear interpolation and step-length when getting maximal value at leaf basin and blade back curve, the higher value of the cutter spacing reference mark number that leaf basin and blade back curve obtain respectively; Be limited on the value of said cutter spacing reference mark number: carry out linear interpolation and step-length when getting minimum value at leaf basin and blade back curve, the smaller value of the cutter spacing reference mark number that leaf basin and blade back curve obtain respectively.
In the blade processing, need be with the cutter shaft inclination certain angle of cutter.Cutter shaft and the hands-off condition of blade need be satisfied in the angle of inclination of said cutter shaft, and then obtain the cutter shaft inclination angle scope of each place, cutter spacing reference mark cutter.
4) confirm the neutralization effect of final cutting force
The neutralization effect of at first confirming cutting force is with the relation between three kinds of cutter spacing reference mark data areas, and the neutralization effect of said cutting force is that the double-pole head adds man-hour, and the double-pole head acts on the neutralization effect of making a concerted effort on the blade to be processed; In three kinds of cutter spacing reference mark data areas that step 3) obtains; Choose the number at step-length, cutter spacing reference mark between best cutter spacing reference mark and the value that the cutter shaft inclination angle of cutter is located at each corresponding cutter spacing reference mark, make the double-pole head act on the minimum of making a concerted effort on the blade to be processed.
Its force analysis is with reference to shown in Figure 2 during double-pole head processing blade.As far as single milling cutter, mainly receive the effect of three power during cutting, one is main cutting force, acts on the circumferencial direction of milling cutter; One is back force, acts on the radial direction of milling cutter; Last is an axial force, acts on the axis direction of milling cutter.Corresponding, blade to be processed receives three acting forces that single milling cutter applies it.Generally when analyzing, cutter is decomposed into the acting force of three mutual vertical direction to the cutting force of blade to be processed, with reference to shown in Figure 2, F eBe transverse component, F vBe power, the F that acts on the work top vertical direction fBe vertical component.When two cutters 4 and 5 add man-hour in the profile both sides of blade to be processed; In the data area of cutter spacing reference mark; These three parameters of cutter shaft inclination angle of step-length between choose reasonable cutter spacing reference mark, the number at cutter spacing reference mark and place, each corresponding cutter spacing reference mark cutter; Can so that two cutters to the acting force part of blade to be processed or all cancel out each other, this will make the distortion of blade work in-process to be processed reduce greatly, help improving processing of leaves quality to be processed.
After the number at preliminary definite cutter spacing reference mark and the size of step-length, can confirm the corresponding relation between blade back and each cutter spacing reference mark of leaf pelvic curvature line.With reference to Fig. 7; For both sides corresponding cutter location A and A ', B and B ' and C and C '; Under the situation of given cutter spacing control number and cutter spacing reference mark step value,, can obtain the cutting force counteracting relational expression 1-1 that double-pole is processed corresponding cutter location according to the cutting Force Model that institute's employing cutter is confirmed
F → i = F → i ( θ i ) + F → i ′ ( θ i ′ ) - - - ( 1 - 1 )
In the formula,
Figure BDA0000036929440000102
---double-pole head acts on the cutting force of corresponding cutter location on the blade to be processed and makes a concerted effort;
Figure BDA0000036929440000111
---blade back cutter spacing reference mark i point place cutting force is with the relational expression between the cutter inclination angle;
Figure BDA0000036929440000112
---leaf basin cutter spacing reference mark i ' some place cutting force is with the relational expression between the cutter inclination angle;
θ i, θ I '---refer to the cutter inclination angle at blade back, place, the corresponding cutter spacing of leaf basin reference mark respectively;
I, i '---refer to blade back, leaf basin cutter spacing reference mark numbering 1,2,3 respectively ...
Cutter inclination angle theta through the corresponding cutter location of choose reasonable place i, θ I ', make
Figure BDA0000036929440000113
Minimum promptly can reach optimum cutting force neutralization effect.
Definite process of the concrete value at the size of step-length and cutter shaft inclination angle, place, each corresponding cutter spacing reference mark is following between the number at the cutter spacing reference mark on cross section, cutter spacing reference mark:
To an initial value of number at step-length between the cutter spacing reference mark and cutter spacing reference mark,, confirm the span at cutter shaft inclination angle at first respectively according to these two initial values; Thus, obtain the cutting force optimal synthesis neutralization effect formula 1-1 of whole cross section under this cutter spacing reference mark number and step-length value scheme
F → = Σ 1 n F → i - - - ( 1 - 1 )
In the formula,
---double-pole head acts on total the making a concerted effort on the blade to be processed;
Figure BDA0000036929440000116
---the double-pole head acts on the blade to be processed, and i makes a concerted effort to the cutting force of corresponding cutter location;
N---the number at cutter spacing reference mark.
The comprehensive neutralization effect of cutting force when the number at the cutter spacing reference mark of more different values and step-length; The cutter spacing reference mark number and the step value that are made
Figure BDA0000036929440000117
and hour adopted; And obtain the cutter shaft inclination angle value at cutter spacing reference mark, confirm three parameters of cutter path planning thus.
Here the data at cutter spacing reference mark obtain actual be the coordinate and the cutter shaft inclination angle of point of contact, need be according to obtaining center cutter point coordinate (x after the biasing of the concrete selected shape of tool and cutter inclination angle m, y m, z m) (m=1,2,3...), the cutter shaft inclination angle obtains the direction cosine (i of generating tool axis vector under workpiece coordinate system through coordinate system transformation m, j m, k m) (m=1,2,3...).Thereby finally confirm the cutter location coordinate (x of double-pole process tool trajectory planning m, y m, z m, i m, j m, k m) and (x n, y n, z n, i n, j n, k n).
After obtaining the cutter path in a cross section, repeat said process and can obtain the cutter path on the whole blade profile.
Then, the combined process parameter is revised the cutter path that obtains, and makes blade processing cutting force everywhere make a concerted effort to satisfy actual processing request.Simultaneously, through regulating blade back and leaf basin both sides speed of feed, make in reality processing, to reach cutter spacing reference mark corresponding relationship.
At last, through the post processor of special use, be nc program with cutter spacing reference mark coordinate transformation.
In the cutter path planning process of double-pole processing, in conjunction with original orbit generation method, consider the influence of cutter path to cutting force, satisfied the linear error requirement of trajectory planning, and with follow-up nc program length control within the specific limits.Because the neutralization effect of cutting force is good; Thereby in reality processing, during basketry, can adopt bigger cutting data to process, when satisfying crudy; Can also improve existing long problem of blade processing cycle, the market outlook that createed are very considerable.In addition, this method not only is confined to the optimization of cutting force consider to cut in the scope of speed of feed, has enriched the content of cutter path planning.

Claims (5)

1. the cutter path generation method of the double-pole hair style of steam turbine linear leaf profile processing is characterized in that, according to following steps:
1) establishes cutting Force Model
At first, set up cutting force, obtain the cutting Force Model of blade processing with the corresponding mathematical relation between the cutter shaft inclination angle in the blade processing;
2) the cross section molded lines data of acquisition blade
Confirm that the high direction of leaf is processing line-spacing direction; Be the processing direction of feed along the blade profile molded lines, both sides tool feeding direction is consistent, promptly all by leading edge to lagging edge; Or lagging edge is processed to leading edge; Line-spacing according to leaf three-dimensional model and line-spacing, obtains blade profile molded lines data by waiting row pitch method to confirm;
3) confirm cutter spacing reference mark data area in each cross section
Confirm the cutter spacing reference mark data span of double-pole in the blade profile molded lines, said cutter spacing reference mark data comprise the number at step-length between the cutter spacing reference mark, cutter spacing reference mark and the cutter shaft inclination angle of place, each corresponding cutter spacing reference mark cutter;
4) confirm the neutralization effect of final cutting force
The neutralization effect of at first confirming cutting force is with the relation between three kinds of cutter spacing reference mark data areas, and the neutralization effect of said cutting force is that the double-pole head adds man-hour, and the double-pole head acts on the neutralization effect of making a concerted effort on the blade to be processed; In three kinds of cutter spacing reference mark data areas that step 3) obtains; Choose the number at step-length, cutter spacing reference mark between best cutter spacing reference mark and the value that the cutter shaft inclination angle of cutter is located at each corresponding cutter spacing reference mark, make the double-pole head act on the minimum of making a concerted effort on the blade to be processed; The concrete obtaining value method at the cutter shaft inclination angle of the number at step-length, cutter spacing reference mark and each corresponding cutter spacing reference mark place cutter is between the cutter spacing reference mark on each blade profile:
To an initial value of number at step-length between the cutter spacing reference mark and cutter spacing reference mark,, confirm the span at cutter shaft inclination angle at first respectively according to these two initial values; Thus, obtain the cutting force optimal synthesis neutralization effect formula (1-1) of whole cross section under this cutter spacing reference mark number and step-length value scheme
F → = Σ 1 n F → i - - - ( 1 - 1 )
In the formula,
---double-pole head acts on total the making a concerted effort on the blade to be processed;
Figure FDA0000140994510000023
---the double-pole head acts on the blade to be processed, and i makes a concerted effort to the cutting force of corresponding cutter location;
N---the number at cutter spacing reference mark;
The comprehensive neutralization effect of cutting force when the number at the cutter spacing reference mark of more different values and step-length; The cutter spacing reference mark number and the step value that are made
Figure FDA0000140994510000024
and hour adopted; And obtain the cutter shaft inclination angle value at cutter spacing reference mark, confirm three parameters of cutter path planning thus.
2. the cutter path generation method of the double-pole hair style processing of steam turbine linear leaf profile according to claim 1; It is characterized in that step 2) in, definite method of line-spacing is: on the direction high along leaf; Equidistant intercepting blade profile, the distance between the two adjacent blades cross sections is line-spacing.
3. the cutter path generation method of the double-pole hair style processing of steam turbine linear leaf profile according to claim 1; It is characterized in that; In the step 3); Through to blade profile molded lines linear interpolation, the distance between the two cutter spacing reference mark, front and back that obtain is a step value, the maximal value L of step-length between the cutter spacing reference mark MaxBy maximum linear interpolation error delta MaxConfirm to obtain, the minimum value of step-length is kL Max(0＜k＜1), the concrete value of k during according to blade processing machining precision and require process time to confirm.
4. the cutter path generation method of processing according to the double-pole hair style of claim 1 or 3 described steam turbine linear leaf profiles; It is characterized in that; In the step 3); Be limited under the value of said cutter spacing reference mark number: carry out linear interpolation and step-length when getting maximal value at leaf basin and blade back curve, the higher value of the cutter spacing reference mark number that leaf basin and blade back curve obtain respectively; Be limited on the value of said cutter spacing reference mark number: carry out linear interpolation and step-length when getting minimum value at leaf basin and blade back curve, the smaller value of the cutter spacing reference mark number that leaf basin and blade back curve obtain respectively.
5. the cutter path generation method of the double-pole hair style processing of steam turbine linear leaf profile according to claim 1; It is characterized in that; In the step 3); With the cutter shaft of the cutter angle that tilts, cutter shaft and the hands-off condition of blade need be satisfied in the angle of inclination of said cutter shaft, obtain the cutter shaft inclination angle scope of each place, cutter spacing reference mark cutter at last.
CN201010579065A 2010-12-08 2010-12-08 Cutter path generating method for double blade head processing of turbine long blade profile Expired - Fee Related CN102096391B (en)

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