CN101417396A - Turbine hollow blade rabbet processing locating clamping method and device - Google Patents
Turbine hollow blade rabbet processing locating clamping method and device Download PDFInfo
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- CN101417396A CN101417396A CNA2008102324423A CN200810232442A CN101417396A CN 101417396 A CN101417396 A CN 101417396A CN A2008102324423 A CNA2008102324423 A CN A2008102324423A CN 200810232442 A CN200810232442 A CN 200810232442A CN 101417396 A CN101417396 A CN 101417396A
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Abstract
The invention discloses a clamping method and a fixture of processing and locating of a turbine hollow blade tenon. In the selection of locating points, five optimum locating points are selected by adopting a fixture precision theory based on the differential geometry, a form closure rule of locating points with the help of a blade surface three-dimensional model and so when six points comprising a benchmark are used for location, the precision of blade location is the highest; in the selection of clamping points, weak links are avoided and auxiliary clamping points are chosen on a tenon top end and a blade mounting plate which are better in rigidity and bigger in size for reducing as much stress and deformation as possible to the hollow blade. On the basis, the invention designs a special fixture for processing the blade tenon, which consists of a fixture body, a location pin, auxiliary fixtures of the tenon top end and the blade mounting plate. The fixture can ensure the accurate location and effective clamping in the processing of the turbine hollow blade tenons, improve the efficiency in the manufacturing process of complex curved hollow blades, reduce the cost and eliminate the harm to human health.
Description
Technical field
The invention belongs to turbo blade processing positioning method and Special Clamps Design, be specifically related to location, clamping means and the anchor clamps of the hollow moving vane tenon processing of a kind of gas turbine turbine.
Background technology
Gas turbine is the rotating type impeller motive power machine device that a kind of heat energy with gas or liquid fuel (as natural gas, fuel oil) burning generation is converted into mechanical power, being widely used in fields such as the energy, aviation, traffic, national defence, is the crucial great equipment that adapts to China's Energy restructuring and aircraft industry development.The high-temperature turbine blade is in temperature the highest (more than 1400 ℃), the most complicated, the worst position of environment of stress in the gas turbine, and its value accounts for the nearly 50% of product complete machine, is the critical component in the gas turbine.Adopting the cooled blade structure is to improve the effective measures of gas turbine proficiency, and turbine high temperature level moving vane adopts blade inside that the cooling structure form that especially has the aperture that gathers on profiled holes cooling duct, the blade surface at leading edge is arranged more at present.Because blade curved surface more complicated and whole hollow, how to guarantee the accurate location in the blade mechanism processing and rationally clamp also just to become to guarantee that blade is in high temperature, the key in adverse circumstances such as rotation following service life at a high speed.
At present, in the processing of blade tenon, a kind of processing mode mostly follows in engine production producer: promptly adopt low-temperature alloy to contain the box anchor clamps complex-curved blade is processed.Anchor point on the rule of thumb selected blade of this technology, after adopting box anchor clamps locating blades, low-melting alloy is poured into space between casing and the blade, form an integral body, utilize the profile of casing rule to clamp and process, so just avoiding the stressed purpose that reaches accurate processing simultaneously of blade.Utilize low-temperature alloy to contain the box method and carry out blade tenon and be processed with lot of advantages, for example accurate positioning, process to operating force do not have specific (special) requirements, clamping is stable.But its shortcoming also is apparent, because the low-melting alloy that uses has toxicity to human body, it is very big to operator's Health cost to get off for a long time.Simultaneously, low-temperature alloy containing box anchor clamps working (machining) efficiency is lower, the production cycle is long, cost is very high, has restricted the blade large-scale processing and has produced.
Summary of the invention
Contain the existing deficiency of box method in order to overcome existing low-temperature alloy, the present invention proposes a kind of new turbine hollow blade tenon processing method for positioning and clamping and anchor clamps.This method is theoretical based on the shape sealing of differential geometric anchor clamps precision theory, location, choose tenon and add the highest five anchor points of blade positioning accuracy in man-hour, to assist and clamp point selection in tenon top and blade installing plate side, make tenon add man-hour the blade positioning accuracy and stress deformation simultaneously controlled, and designed turbine hollow blade tenon Special Fixture for Machining on this basis.
For reaching above purpose, the present invention takes following technical scheme to be achieved:
A kind of turbine hollow blade tenon processing method for positioning and clamping comprises the selection of blade profile anchor point and carries out the auxiliary clamping of the clamping of blade profile location and blade tenon top and blade installing plate according to selected site; Wherein, the selection of blade profile anchor point, at first a side selects one the 5th anchor point as datum mark on blade installing plate blade, utilizes given blade profile design data then, sets up the accuracy constraint Mathematical Modeling of blade anchor point; Obtain choosing the point set space of anchor point, determine the anchor point selection optimization criterion that the position-based precision is best then; Shape sealing according to anchor point requires to determine to optimize constraints again; Optimize at last and choose and five anchor points of definite blade profile: first to fourth top anchor point and the 6th following anchor point; According to first to the 6th alignment pin on the next corresponding arrangement jig main body of determined first to the 6th anchor point, make six alignment pin round ends lay respectively at the normal direction of blade first to the 6th anchor point, guarantee that blade is put into and with after alignment pin contacts, alignment pin is perpendicular to blade anchor point section; Alignment pin is set on the jig main body is positioned at blade tip, and about the blade tenon end face adopts the tenon end face auxiliary clamp that separates with jig main body with blade, clamp away from blade tenon; Adopt the installing plate auxiliary clamp that is connected as a single entity with jig main body to realize that the blade above-below direction clamps in both sides up and down at the blade installing plate.
In the said method, following concrete steps are adopted in the selection of described blade profile anchor point:
The first step, according to location of workpiece error and anchor point error relation, promptly the normal vector of anchor point and workpiece contact point is n
i, the contact point coordinate is R
i,, δ θ then by the position disturbance δ q={ δ b of workpiece arbitrfary point } and the site error of the anchor point that brings is
Wherein
Be the locating point position vector; Therefore, have the accuracy constraint of the anchor clamps of l anchor point, promptly the site error of anchor point can be expressed as: δ y=G
Tδ q, wherein: δ y={ δ y
1, δ y
2..., δ y
l, G=[h
1, h
2..., h
l] be the locating point position matrix, the corresponding given anchor clamps anchor point of each locating point position matrix G distributes;
Second goes on foot, and the position coordinates of blade surface characteristic point is provided in the leaf model, utilizes the cubic B batten that the position coordinates of characteristic point is carried out match, obtains the blade profile control node of B batten statement; B-spline surface control node according to obtaining calculates the normal vector of blade surface characteristic point, thereby obtains choosing the point set space g of anchor point
i=[R
in
i] (1≤i≤N);
The 3rd step: the error Normal Distribution of supposing each anchor point: δ y ≈ N (0, V
y), V wherein
y=diag{ δ
1, δ
2... δ
l, the position variance matrix of anchor point is
Make A=V
-1, the best condition of positional precision that then makes workpiece is max (det A); Because the material behavior of each setting element is identical, so the δ y of different anchor points
iObey identical distribution δ y
i≈ N (0, V
y), then have
Therefore the best optimization criterion of location of workpiece precision is: max (det A)=max (det (GG
T));
The 4th step: for given anchor clamps locating point position matrix G=[h
1, h
2..., h
l], when acting on any external force on the workpiece, the anchor clamps locating point position does not change, and effect has the positive power of normal direction, the locating point position matrix G=[h under the then this state on each anchor point
1, h
2..., h
l] just satisfy shape sealing.Then in locating point position matrix G, select a position vector h arbitrarily
c, apply any external force along its normal direction, for all h
i, α
i=-h
i TA
-1h
cShould satisfy a
i0;
The 5th step: at the point set space of blade profile characteristic point g
i=[R
in
i] (among 1≤i≤N), serve as to optimize criterion with max (det A), at constraints a
iOptimize 0 time and to choose five anchor points with full accuracy, concrete steps are as follows:
A. initialization, the position vector h of anchor point on the blade installing plate that calculating has been determined
0, and calculate point set g
i=[R
in
i] (direction vectors of all N points among 1≤i≤N) are to locating point position matrix G
0Initialization; Obtain G
0={ h
0h
1... h
N, h wherein
0Be the anchor point of having determined, calculate corresponding A
0And A
0 -1Then at locating point position matrix G
0In select a position vector h arbitrarily
c, apply any external force along its normal direction, for given h
i(1≤i≤N), calculate α
i=-h
i TA
0 -1h
c, and make k=N;
If b. there is the anchor point do not satisfy the shape sealing, then deletion makes p in these points
j=h
j TA
m -1h
j(m=N-k) Zui Xiao some j; If all anchor points all satisfy the shape sealing condition, then directly deletion makes p
j=h
j TA
m -1h
j(m=N-k) Zui Xiao anchor point j, and make k=k-1;
C. with the point set rearrangement, new point set becomes g
i=[R
in
i] (1≤i≤k), upgrade G
m={ h
0h
1... h
k, A
m, A
m -1And α
i=-h
i TA
m -1h
c(m=N-k), repeating step b again, so repeatedly, up to k=5.
A kind of anchor clamps of realizing preceding method comprise jig main body, it is characterized in that, are connected with the installing plate auxiliary clamp of realizing that the blade above-below direction clamps on the jig main body; Jig main body is provided with first to the 6th alignment pin of respective vanes first to the 6th anchor point, make six alignment pin round ends lay respectively at the normal direction of blade first to the 6th anchor point, guarantee that blade is put into and with after alignment pin contacts, alignment pin is perpendicular to blade anchor point section; Also be provided with holding pin on the jig main body, this holding pin and a tenon end face additional lock that separates with jig main body clamp about with blade.
In the above-mentioned anchor clamps scheme, the tenon end face auxiliary clamp and the installing plate auxiliary clamp of described blade be equipped with can regulate and self adaptation contact the design auxiliary folder, should comprise head and bar portion by auxiliary folder, the last plane of head contacts with workpiece, and inner plane contacts with the sphere on bar portion top.Described bar portion is provided with screw thread, can help anchor clamps cooperate to realize the position adjustment with the tenon end face of blade and installing plate are attached.
Advantage of the present invention is: propose the shape sealing constraints based on differential geometric anchor clamps precision theory, anchor point, on blade, choose five optimum anchor points by the blade profile threedimensional model, when feasible utilization comprised six anchor point location of datum mark, the positioning accuracy of blade was the highest; In the selection of clamping point, avoid weak link as far as possible, the auxiliary point selection that clamps on the blade installing plate of tenon top and blade profile and tenon transition part, is reduced the stressed of hollow blade blade and distortion as far as possible; On this basis, designed turbine hollow blade tenon Special Fixture for Machining, these anchor clamps have round end alignment pin, the fine thread blade tip holding pin perpendicular to plane of orientation and adopt self adaptation to contact the auxiliary clamp and the folder of design, can guarantee cooperatively interacting of anchor clamps and folder, can satisfy the accurate location in the processing of turbine hollow blade tenon and effectively clamp requirement.
Description of drawings
The present invention is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is a blade construction.The turbine hollow blade comprises tenon 14, installing plate 15 and blade profile 16, and blade is hollow, and inside has complicated cooling pipe, and tenon 14 is blade reference for installation on turbine.
Fig. 2 is six anchor point schematic diagrames of blade.One of them anchor point d5 is in installing plate 15 close blade profile one side centre positions, by optimizing resulting five anchor point d1, d2, d3, d4 (top), d6 (following) on blade profile 16.
Fig. 3 is clamp structure figure of the present invention.Wherein Fig. 3 (a) be jig main body 10 and on located in connection, clamping element, comprise and blade profile anchor point d1, d2, d3, the corresponding alignment pin 1,2,3,4,6 of d4, d6, blade tip holding pin 7, the folder 9,11,12,13 on the blade installing plate auxiliary clamp 8; Fig. 3 (b) be tenon end face auxiliary clamp 19 and on folder 20,21.
Fig. 4 is the folder and the blade installing plate connection diagram of blade installing plate auxiliary clamp among Fig. 3.
Fig. 5 is the structural representation of folder among Fig. 3 Fig. 4.17 is heads of folder among the figure, the 18th, and the bar portion of folder.The last plane of head 17 contacts with workpiece, and inner plane contacts with the sphere on bar portion 18 tops, allows workpiece and folder contact-making surface that certain angular error is arranged.Folder bar portion 18 has screw thread, can cooperate realization position adjustment with blade installing plate and the attached anchor clamps 8,19 that help of tenon end face.
Fig. 6 is that location of workpiece error and anchor point error concern schematic diagram.XYZ is a fixed coordinate system among the figure, C
iBe anchor point, R
iBe the coordinate of anchor point and workpiece contact point, n
iBe the contact point normal vector.δ
qBe the site error of arbitrfary point on the workpiece, δ
YiThe anchor point error that is caused for location of workpiece error.
The specific embodiment
The scheme of choosing of anchor point
In order to guarantee the stable position in tenon 14 processing, overlap according to location benchmark and design basis as far as possible, at first on blade installing plate 15, select the blade profile design basis o'clock as an anchor point d5, according to the three-dimensional mathematical model of blade profile 16, select other five anchor point d1, d2, d3, d4, d6 then on its surface.At first the locating point position error that is caused by location of workpiece disturbance is set up the accuracy constraint Mathematical Modeling of anchor point; Utilize the position coordinates of the characteristic point that obtains by design on the cubic B spline-fit blade profile then, calculate the space vector of the characteristic point that comprises normal vector, obtain anchor point point set space to be selected; Next supposes the error Normal Distribution of anchor point, obtains the best optimization criterion of location of workpiece precision according to statistical theory; Based on the shape sealing theory of workpiece location, determine the optimization constraints of anchor clamps anchor point once more; Last selector closes and states the optimization criterion in the point set space of blade profile characteristic point, satisfies five anchor points with full accuracy under the type sealing constraints.Concrete system of selection is as follows:
The first step: the accuracy constraint Mathematical Modeling of setting up anchor point.
Location of workpiece error and anchor point error concern schematic diagram as shown in Figure 7, and wherein the normal vector of anchor point and workpiece contact point is n
i, the contact point coordinate is R
iThen by the position disturbance δ q={ δ b of workpiece arbitrfary point, δ θ } site error of the anchor point that brings is
Wherein
Therefore, have the accuracy constraint of the anchor clamps of l anchor point, promptly the site error of anchor point can be expressed as: δ y=G
Tδ q, wherein: δ y={ δ y
1, δ y
2..., δ y
l, G=[h
1, h
2..., h
l].
Second step: the point set space that obtains choosing anchor point.
The position coordinates of a large amount of characteristic points of blade surface is provided in the leaf model, but the normal vector of characteristic point is not provided.In order to try to achieve the characteristic point vector g that comprises the method for characteristic point vector
i=[R
in
i], utilize the cubic B batten that the position coordinates of characteristic point is carried out match, obtain the blade profile control node of B batten statement; According to the B-spline surface control node that obtains, calculate the normal vector of blade surface characteristic point.Thereby obtain choosing the point set space of anchor point.
The 3rd step: determine the optimization criterion that the position-based precision is best.
Suppose the error Normal Distribution of each anchor point: δ y ≈ N (0, V
y), V wherein
y=diag{ δ
1, δ
2... δ
l.According to statistical theory, the position variance matrix of anchor point
Make A=V
-1, the best condition of positional precision that then makes workpiece is max (det A).
For actual conditions, because the material behavior of each setting element is identical, so the δ y of different anchor points
iObey identical distribution δ y
i≈ N (0, V
y), then have
A=V
-1=G δ G
T=δ GG
T, so the best optimization criterion of location of workpiece precision is: max (det A)=max (det (GG
T)).
The 4th step: determine optimization constraints based on the shape sealing.
For given anchor clamps anchor point distribution G=[h
1, h
2..., h
l], if when acting on any external force on the workpiece, the anchor clamps locating point position does not change, and effect has the positive power of normal direction, the anchor point distribution G=[h under the then this state on each anchor point
1, h
2..., h
l] just satisfy shape sealing.If the anchor clamps anchor point satisfies the shape sealing condition.Then in locating point position matrix G, select a position vector h arbitrarily
c, apply any external force along its normal direction, for all h
i, α
i=-h
i TA
-1h
cShould satisfy a
i0.
The 5th step: optimize five anchor points on the blade profile.
At the point set space of blade profile characteristic point g
i=[R
in
i] (among 1≤i≤N), serve as to optimize criterion with max (det A), at constraints α
iChoose five anchor points with full accuracy 0 time.Concrete optimizing process is as follows:
Step a: initialization.Calculate the position vector h of anchor point on the blade installing plate of having determined
0, and calculate point set g
i=[R
in
i] (direction vectors of all N points among 1≤i≤N) are to G
0Initialization; Obtain G
0={ h
0h
1... h
N(h wherein
0Be the anchor point of having determined) after, corresponding A calculated
0And A
0 -1Then at locating point position matrix G
0In select a position vector h arbitrarily
c, apply any external force along its normal direction, for given h
i(1≤i≤N), calculate α
i=-h
i TA
0 -1h
c, and make k=N;
Step b: if there is the anchor point do not satisfy the shape sealing, then deletion makes p in these points
j=h
j TA
m -1h
j(m=N-k) Zui Xiao some j; If all anchor points are satisfying property sealing condition all, then directly deletion makes p
j=h
j TA
m -1h
j(m=N-k) Zui Xiao anchor point j, and make k=k-1;
Step c: with the point set rearrangement, new point set becomes g
i=[R
in
i] (1≤i≤k), upgrade G
m={ h
0h
1... h
k, A
m, A
m -1And α
i=-h
i TA
m -1h
c(m=N-k), repeat Step b again.So repeatedly, up to k=5.
The selection scheme of clamping point
Come six alignment pins 1,2,3,4,5,6 on the corresponding arrangement anchor clamps according to determined six anchor point d1, d2, d3, d4, d5, d6, make six round end alignment pins lay respectively at the normal direction of blade anchor point d1, d2, d3, d4, d5, d6, guarantee that blade is put into and with after alignment pin contacts, alignment pin is perpendicular to blade anchor point section.In the selection of clamping point, avoid weak link as far as possible, holding pin 7 is chosen in relatively more smooth blade tip, will laterally auxiliary folder 20,21 corresponding be chosen in that rigidity is big, area is big, tenon 14 tops (Fig. 3 (b)) of shape comparison rule with it; With auxiliary folder 9,11,12,13 longitudinally be chosen in shape comparatively rule, have on the bigger blade installing plate 15 of two parallel planes, rigidity (Fig. 4).Reduce the stressed of hollow blade blade and distortion as far as possible.
Blade tenon clamp for machining design
But designed turbo blade tenon clamp for machining mainly is made up of jig main body 10, six fixed-site and uncontrollable alignment pin 1,2,3,4,5,6, top holding pin 7, blade installing plate auxiliary clamp 8, the attached auxiliary folder that helps anchor clamps 19 and position self adaptation to regulate of tenon end face.Auxiliary folder comprises the auxiliary folder 20,21 of auxiliary folder 9,11,12,13 of blade installing plate and blade tenon end.Attached anchor clamps 19 and the jig main body 10 of helping of tenon end face adopts the branch body structure, so that blade is installed; Installing plate auxiliary clamp 8 adopts integral structure with jig main body 10, to improve the rigidity that clamps up and down.Top holding pin 7 adopts the closely-pitched screw-rod structure that can accurately move, and guarantees the accurate clamping of blade tip.Auxiliary folder 9,11,12,13,20,21 adopts self adaptation contact design (Fig. 5), is that plane and sphere cooperate between its head 17 and the bar portion 18, allows workpiece and auxiliary folder contact-making surface that certain angular error is arranged; Auxiliary folder bar portion 18 is a screw-rod structure, can realize the position adjustment of auxiliary folder.
The location of blade tenon clamp for machining and clamping process
As shown in Figure 3, before the location clamps, tenon end face auxiliary clamp 19 integral body are pushed away jig main body 10, and blade tip holding pin 7, the auxiliary folder 20,21 in tenon top and the auxiliary folder 9,11,12,13 of blade installing plate are adjusted to highest distance position respectively.With blade profile 16 inwards, tenon 14 ends outwardly, slowly push jig main body 10 by anchor clamps left end along continuous straight runs, and blade installing plate 15 and blade profile 16 contacted with six alignment pin 1-6 on the anchor clamps respectively, realize accurately location.At first adjust blade tip holding pin 7 and closely contact,, and adjust the screw-in screw rod that folder 20,21 is assisted in the tenon end, realize clamping about blade then with tenon end face auxiliary clamp 19 close jig main bodies 10 with blade.After the blade left and right sides is clamped, adjust the screw-in screw rod of the auxiliary folder 9,11,12,13 of blade installing plate respectively, realize that blade stable clamping up and down is fastening.
Claims (8)
1, a kind of turbine hollow blade tenon processing method for positioning and clamping is characterized in that, comprises the selection of blade profile anchor point and carries out the auxiliary clamping of the clamping of blade profile location and blade tenon top and blade installing plate according to selected site; Wherein, the selection of blade profile anchor point, at first a side selects one the 5th anchor point as datum mark on blade installing plate blade, utilizes given blade profile design data then, sets up the accuracy constraint Mathematical Modeling of blade anchor point; Obtain choosing the point set space of anchor point, determine the anchor point selection optimization criterion that the position-based precision is best then; Shape sealing according to anchor point requires to determine to optimize constraints again; Optimize at last and choose and five anchor points of definite blade profile: first to fourth top anchor point and the 6th following anchor point; According to first to the 6th alignment pin on the next corresponding arrangement jig main body of determined first to the 6th anchor point, make six alignment pin round ends lay respectively at the normal direction of blade first to the 6th anchor point, guarantee that blade is put into and with after alignment pin contacts, alignment pin is perpendicular to blade anchor point section; Holding pin is set on the jig main body is positioned at blade tip, and about the blade tenon end face adopts the tenon end face auxiliary clamp that separates with jig main body with blade, clamp away from blade tenon; Adopt the installing plate auxiliary clamp that is connected as a single entity with jig main body to realize that the blade above-below direction clamps in both sides up and down at the blade installing plate.
2, turbine hollow blade tenon processing method for positioning and clamping as claimed in claim 1 is characterized in that following concrete steps are adopted in the selection of described blade profile anchor point:
The first step, according to location of workpiece error and anchor point error relation, promptly the normal vector of anchor point and workpiece contact point is n
i, the contact point coordinate is R
i, then by the position disturbance δ of workpiece arbitrfary point
qThe site error of=the anchor point that { δ b, δ θ } brings is
Wherein
Be the locating point position vector; Therefore, have the accuracy constraint of the anchor clamps of l anchor point, promptly the site error of anchor point can be expressed as: δ y=G
Tδ q, wherein: δ y={ δ y
1, δ y
2..., δ y
l, G=[h
1, h
2..., h
l] be the locating point position matrix, the corresponding anchor clamps anchor point of each locating point position matrix G distributes;
Second goes on foot, and the position coordinates of blade surface characteristic point is provided in the leaf model, utilizes the cubic B batten that the position coordinates of characteristic point is carried out match, obtains the blade profile control node of B batten statement; B-spline surface control node according to obtaining calculates the normal vector of blade surface characteristic point, thereby obtains choosing the point set space g of anchor point
i=[R
in
i] (1≤i≤N);
The 3rd step: the error Normal Distribution of supposing each anchor point: δ y ≈ N (0, V
y), V wherein
y=diag{ δ
1, δ
2... δ
l, the position variance matrix of anchor point is
Make A=V
-1, the best condition of positional precision that then makes workpiece is max (det A); Because the material behavior of each setting element is identical, so the δ y of different anchor points
iObey identical distribution δ y
i≈ N (0, V
y), then have
Therefore the best optimization criterion of location of workpiece precision is: max (det A)=max (det (GG
T));
The 4th step: for given anchor clamps locating point position matrix G=[h
1, h
2..., h
l], when acting on any external force on the workpiece, the anchor clamps locating point position does not change, and effect has the positive power of normal direction, the locating point position matrix G=[h under the then this state on each anchor point
1, h
2..., h
l] just satisfy the shape sealing, if the anchor clamps anchor point satisfies the shape sealing condition, then in locating point position matrix G, select a position vector h arbitrarily
c, apply any external force along its normal direction, for all h
i, a
i=-h
i τA
-1h
cShould satisfy a
i0;
The 5th step: at the point set space of blade profile characteristic point g
i=[R
in
i] (among 1≤i≤N), serve as to optimize criterion with max (det A), at constraints a
iOptimize 0 time and to choose five anchor points with full accuracy.
3, turbine hollow blade tenon processing method for positioning and clamping as claimed in claim 2 is characterized in that the concrete steps that five anchor points with full accuracy are chosen in described optimization are as follows:
A. initialization, the position vector h of anchor point on the blade installing plate that calculating has been determined
0, and calculate point set g
i=[R
in
i] (direction vectors of all N points among 1≤i≤N) are to locating point position matrix G
0Initialization; Obtain G
0={ h
0h
1... h
N, h wherein
0Be the anchor point of having determined, calculate corresponding A
0And A
0 -1Then at locating point position matrix G
0In select a position vector h arbitrarily
c, apply any external force along its normal direction, for given h
i(1≤i≤N), calculate a
i=-h
i TA
o -1h
cAnd make k=N;
If b. there is the anchor point do not satisfy the shape sealing, then deletion makes p in these points
j=h
j TA
m -1h
j(m=N-k) Zui Xiao some j; If all anchor points all satisfy the shape sealing condition, then directly deletion makes p
j=h
j TA
m -1h
j(m=N-k) Zui Xiao anchor point j, and make k=k-1;
C. with the point set rearrangement, new point set becomes g
i=[R
in
i] (1≤i≤k), upgrade G
m={ h
0h
1... h
k, A
m, A
m -1And a
i=-h
i TA
m -1h
c(m=N-k), repeating step b again, so repeatedly, up to k=5.
4, turbine hollow blade tenon processing method for positioning and clamping as claimed in claim 1, it is characterized in that, the tenon end face auxiliary clamp and the installing plate auxiliary clamp of described blade be equipped with can regulate and self adaptation contact the design auxiliary folder, should comprise head and bar portion by auxiliary folder, the last plane of head contacts with workpiece, and inner plane contacts with the sphere on bar portion top.
5, turbine hollow blade tenon as claimed in claim 4 processing method for positioning and clamping is characterized in that, described bar portion is provided with screw thread, can cooperate realization position adjustment with the tenon end face and the attached anchor clamps that help of installing plate of blade.
6, a kind of anchor clamps of realizing claim 1 turbine hollow blade tenon processing method for positioning and clamping comprise jig main body, it is characterized in that, are connected with the installing plate auxiliary clamp of realizing that the blade above-below direction clamps on the jig main body; Jig main body is provided with first to the 6th alignment pin of respective vanes first to the 6th anchor point, make six alignment pin round ends lay respectively at the normal direction of blade first to the 6th anchor point, guarantee that blade is put into and with after alignment pin contacts, alignment pin is perpendicular to blade anchor point section; Also be provided with holding pin on the jig main body, this holding pin and a tenon end face auxiliary clamp that separates with jig main body clamp about with blade.
7, a kind of anchor clamps of realizing claim 1 turbine hollow blade tenon processing method for positioning and clamping as claimed in claim 6, it is characterized in that, the tenon end face auxiliary clamp and the installing plate auxiliary clamp of described blade be equipped with can regulate and self adaptation contact the design auxiliary folder, should comprise head and bar portion by auxiliary folder, the last plane of head contacts with workpiece, and inner plane contacts with the sphere on bar portion top.
8, a kind of anchor clamps of realizing claim 1 turbine hollow blade tenon processing method for positioning and clamping as claimed in claim 7 is characterized in that, described bar portion is provided with screw thread, can cooperate realization position adjustment with the tenon end face and the attached anchor clamps that help of installing plate of blade.
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| CN2008102324423A CN101417396B (en) | 2008-11-27 | 2008-11-27 | Turbine hollow blade rabbet processing locating clamping method and the clamp |
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| CN2008102324423A CN101417396B (en) | 2008-11-27 | 2008-11-27 | Turbine hollow blade rabbet processing locating clamping method and the clamp |
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| CN101417396A true CN101417396A (en) | 2009-04-29 |
| CN101417396B CN101417396B (en) | 2010-06-09 |
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