FIVE-DEGREE-OF-FREEDOM ADJUSTMENT AND POSITIONING METHOD AND APPARATUS FOR ASSEMBLY/MEASUREMENT OF ROTOR AND STATOR OF AIRCRAFT ENGINE

Abstract

A five-degree-of-freedom adjustment and positioning method and apparatus for assembly/measurement of rotor and stator of an aircraft engine; said method comprises adjusting a plane motion and a rotation of a tested piece through composite motion comprising five degrees of freedom: a 360 rotatory motion around a Z axis, a plane motion along an X axis and a plane motion along a Y axis, a rotatory motion around the X axis and a rotatory motion around the Y axis; said apparatus comprises: a clamping mechanism (1), a turning platform component (A), a translational platform component (B) and a rotational platform component (C). The present invention designs a five-degree-of-freedom adjustment and positioning method and apparatus having properties of large load bearing, high precision and high stiffness, thus improving assembly efficiency and measurement accuracy of the aircraft engine.

Claims

1. A five-degree-of-freedom adjustment and positioning method for assembly/measurement of rotor and stator of an aircraft engine, the method comprising: adjusting a plane motion and a rotation of a tested piece through a composite motion comprising five degrees of freedom: a 360 rotatory motion around a Z axis, a plane motion along an X axis, a plane motion along a axis, a rotatory motion around the X axis and a rotatory motion around the Y axis, wherein the X axis and the Y axis are orthogonal to each other, and the Z axis is perpendicular to a plane determined by X and Y axes, specific processes of adjustments are as follows: a plane motion adjustment: 1) firstly driving a tested piece to rotate at 360 through the Z axis, measuring a radial error of a specified cross-section of the tested piece by using a sensor, and obtaining an eccentricity x at the X axis and an eccentricity y at the Y axis of the tested piece; 2) adjusting the tested piece to move along the X axis according to x, and setting motion displacement as x; adjusting the tested piece to move along the Y axis according to y, and setting motion displacement as y; 3) repeating steps 1) and 2), and stopping the plane motion adjustment until the tested piece has an X-axis eccentricity x smaller than the set value x.sub.0 and a Y-axis eccentricity y smaller than the set value y.sub.0; a rotation adjustment: 1) driving the tested piece to rotate at 360 through the Z axis, measuring a specified measuring cross-section 1 of the tested piece by using a sensor, to obtain a spatial coordinate (x.sub.1,y.sub.1,z.sub.1) of a fitting circle center of the cross-section 1; 2) driving the tested piece to rotate at 360 through the Z axis, measuring a specified measuring cross-section 2 of the tested piece by using a sensor, to obtain a spatial coordinate (x.sub.2,y.sub.2,z.sub.2) of the fitting circle center of the cross-section 2; 3) calculating a spatial position of a geometric axis of the tested piece from (x.sub.1,y.sub.1,z.sub.1) and (x.sub.2,y.sub.2,z.sub.2), and obtaining an angle .sub.x between a projection of the geometric axis onto the plane determined by Y axis and Z axis and the Z axis and an angle .sub.y between the projection of the geometric axis onto the plane determined by X axis and Z axis and the Z axis; 4) adjusting the tested piece to do a rotatory motion around the Y axis according to .sub.x, and setting an angle of the rotatory motion as .sub.x; adjusting the tested piece to do a rotatory motion around the X axis according to .sub.y, and setting an angle of the rotatory motion as .sub.y, thereby adjusting the geometric axis of the tested piece to maximally coincide with the rotatory axis Z; 5) repeating steps 1) through 4), and stopping the rotation motion adjustment until the tested piece has an angle .sub.x between its projection of the geometric axis onto the plane determined by Y axis and Z axis and the Z axis smaller than the set value .sub.x0, and an angle .sub.y between its projection of the geometric axis onto the plane determined by X axis and Z axis and the Z axis smaller than the set value .sub.y0.

2. A five-degree-of-freedom adjustment and positioning apparatus for assembly/measurement of rotor and stator of an aircraft engine, comprising a clamping mechanism, a turning platform component, a translational platform component and a rotational platform component; and wherein: the turning platform component comprises a table and a base, the table being disposed on the base; an annular convex spherical bowl is provided on the table, and an annular concave spherical seat is provided on the base; a retainer is fixedly connected with the annular concave spherical seat; circular holes are uniformly distributed on the retainer along a circumferential direction; spherical rolling elements having equal sphere diameters are embedded in the circular holes; the annular concave spherical seat on the base provides support for the annular convex spherical bowl on the table through the spherical rolling elements; an elastic limit supporting post and a driving system are provided on the base along the X axis; the elastic limit supporting post closely contacts and fits with a stop block provided on the table, so as to prevent relative rotation between the table and the base; the driving system for driving table to rotate around the Y axis is connected with a transmission part which is provided on the table; an elastic guide post and a driving system are provided on the base along the Y axis; the elastic guide post contacts and fits with a guiding block provided on the table, so as to guide the table to rotate around the X axis; and the driving system is connected with a transmission part provided on the table, so as to drive the table to rotate around the X axis; the driving system is arranged to be orthogonally adjacent to the driving system, and the elastic limit supporting post is arranged to be orthogonally adjacent to the elastic guide post; the clamping mechanism is fixedly connected on the table of the turning platform component; the translational platform component is placed below the turning platform component and drives the turning platform component to move along the X and Y axes; the translational platform component comprises a base plate and a guide layer, wherein a weight reduction groove is disposed on the guide layer along the circumferential direction; a jacketed plate is provided in the weight reduction groove; through holes are densely distributed in the jacketed plate; spherical rolling elements having equal sphere diameters are embedded in the through holes; the jacketed plate provides support for the base (3) of the turning platform component through the spherical rolling elements; a driving system for driving the guide layer to move along the Y axis is provided symmetrically to the driving system relative to the rotational axis of the rotational platform component; a driving system is provided symmetrically to the driving system relative to the rotational axis of the rotational platform component for driving the base on the turning platform component to move along the X axis; the rotational platform component comprises an air-floating sleeve, an air-floating shaft and a rotary driving system, wherein the air-floating shaft is fitted in the air-floating sleeve; an upper end of the air-floating shaft is fixedly connected to the base plate of the translational platform component, and a lower end of the air-floating shaft is provided with the rotary driving system for driving the rotary motion of the air-floating shaft.

3. The five-degree-of-freedom adjustment and positioning apparatus for the assembly/measurement of rotor and stator of an aircraft engine according to claim 2, wherein the sphere diameters of the spherical rolling elements embedded in the circular holes are the same as or different from those of the spherical rolling elements embedded in the through holes.

4. The five-degree-of-freedom adjustment and positioning apparatus for the assembly/measurement of rotor and stator of an aircraft engine according to claim 2, wherein the X and Y axes are orthogonal to each other, and the rotary axis of the air-floating shaft is perpendicular to the plane determined by the X and Y axes.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0029] FIG. 1 is a coordinate diagram of the five-degree-of-freedom adjustment method for assembly/measurement of rotor and stator of an aircraft engine;

[0030] FIG. 2 is a structural schematic view of the five-degree-of-freedom adjustment and positioning apparatus for assembly/measurement of rotor and stator of an aircraft engine;

[0031] FIG. 3 is a structural schematic view of the table of the five-degree-of-freedom adjustment and positioning apparatus for assembly/measurement of rotor and stator of an aircraft engine;

[0032] FIG. 4 is a structural schematic view of the base of the five-degree-of-freedom adjustment and positioning apparatus for assembly/measurement of rotor and stator of an aircraft engine;

[0033] FIG. 5 is a structural schematic view of the guide layer of the five-degree-of-freedom adjustment and positioning apparatus for assembly/measurement of rotor and stator of an aircraft engine.

[0034] In the figures: A-turning platform component; B-translational platform component; C-rotational platform component; 1clamping mechanism; 2table; 3base; 4annular convex spherical bowl; 5annular concave spherical seat; 6retainer; 7circular holes; 8elastic limit supporting post; 9driving system Q.sub.1; 10stop block; 11transmission part P.sub.1; 12elastic guide post; 13driving system Q.sub.2; 14guiding block; 15transmission part P.sub.2; 16base plate; 17guide layer; 18weight reduction groove; 19jacketed plate; 20through hole; 21driving system Q.sub.3; 22driving system Q.sub.4; 23air-floating sleeve; 4air-floating shaft; 25rotary driving system Q.sub.5; Lgeometric axis of the tested piece.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] Embodiments of the present invention will be described below in details in combination with the accompanying drawings.

[0036] As shown in FIG. 2, a five-degree-of-freedom adjustment and positioning apparatus for assembly/measurement of rotor and stator of an aircraft engine comprises: a clamping mechanism 1, a turning platform component A, a translational platform component B and a rotational platform component C.

[0037] The turning platform component A comprises a table 2 and a base 3, the table 2 being arranged on the base 3; an annular convex spherical bowl 4 is provided on the table 2, and an annular concave spherical seat 5 is provided on the base 3; a retainer 6 is fixedly connected to the annular concave spherical seat 5; circular holes 7 are uniformly distributed on the retainer 6 along the circumferential direction; spherical rolling elements g.sub.1 having equal sphere diameters are embedded in the circular holes 7; an annular concave spherical seat 5 on the base 3 provides support for an annular convex spherical bowl 4 on the table 2 through the spherical rolling elements g.sub.1; an elastic limit supporting post 8 and a driving system Q.sub.1 9 are provided on the base 3 along the X axis; the elastic limit supporting post 8 closely contacts and fits with a stop block 10 on the table 2, so as to prevent relative rotation between the table 2 and the base 3; the driving system Q.sub.1 9 for driving table 2 to rotate around the Y axis is connected with a transmission part P.sub.I 11 which is provided on the table 2; an elastic guide post 12 and a driving system Q.sub.2 13 are provided on the base 3 along the Y axis; the elastic guide post 12 contacts and fits with a guiding block 14 provided on the table 2, so as to guide the table 2 to rotate around the X axis; and the driving system Q.sub.2 13 is connected with a transmission part P.sub.2 15 provided on the table 2, so as to drive the table 2 to rotate around the X axis.

[0038] The driving system Q.sub.1 9 is arranged to be orthogonally adjacent to the driving system Q.sub.2 13, and the elastic limit supporting post 8 is arranged to be orthogonally adjacent to the elastic guide post 12.

[0039] The clamping mechanism 1 is fixedly connected on the table 2 of the turning platform component A.

[0040] The translational platform component B is placed below the turning platform component A and drives the turning platform component A to move along the X and Y axes; the translational platform component B comprises a base plate 16 and a guide layer 17, wherein a weight reduction groove 18 is disposed on the guide layer 17 along the circumferential direction; a jacketed plate 19 is provided in the weight reduction groove 18; through holes 20 are densely distributed in the jacketed plate 19; spherical rolling elements g.sub.2. having equal sphere diameter are embedded in the through holes 20; the jacketed plate 19 provides support for the base 3 of the turning platform component A through the spherical rolling elements g.sub.2; a driving system Q.sub.3 21 for driving the guide layer 17 to move along the Y axis is provided symmetrically to the driving system Q.sub.2 13 relative to the rotational axis of the rotational platform component C; a driving system Q.sub.4 22 is provided symmetrically to the driving system Q.sub.1 9 relative to the rotational axis of the rotational platform component C for driving the base 3 on the turning platform component A to move along the X axis.

[0041] The rotational platform component C comprises an air-floating sleeve 23, an air-floating shaft 24 and a rotary driving system Q.sub.5 25, wherein the air-floating shaft 24 is fitted in the air-floating sleeve 23; an upper end of the air-floating shaft 24 is fixedly connected to the base plate 16 of the translational platform component B, and a lower end of the air-floating shaft 24 is provided with a rotary driving system Q.sub.5 25 for driving rotary motion of the air-floating shaft 24.

[0042] The sphere diameters of the spherical rolling elements g.sub.1 embedded in the circular holes 7 are the same as or different from those of the spherical rolling elements g.sub.2 embedded in the through holes 20.

[0043] The X and Y axes are orthogonal to each other, and the rotary axis of the air-floating shaft 24 is perpendicular to the plane determined by the X and V axes.

[0044] A five-degree-of-freedom adjustment and positioning method for the assembly/measurement of rotor and stator of an aircraft engine comprises: using a rotary driving system Q.sub.5 25 to drive the air-floating shaft 24 to rotate at 360 around the Z axis in the air-floating sleeve 23, and using a driving system Q.sub.4 22 to drive the base 3 on the turning platform component A to move along the X axis, and using a driving system Q.sub.3 21 to drive the guide layer 17 to move along the Y axis, driving the loads to move along the Y axis, too. The process of plane motion adjustment is as follows: 1) driving a tested piece to rotate at 360 through the air-floating shaft 24, measuring a radial error of a specified cross-section of the tested piece by using a sensor, and obtaining the eccentricity x at the X axis and the eccentricity y at the Y axis of the tested piece; 2) using a driving system Q.sub.4 22 to drive the base 3 on the turning platform component A to move along the X axis according to x, adjusting the tested piece to move along the X axis, and setting the motion displacement as x; and using a driving system Q.sub.3 21 to drive the guide layer 17 to move along the Y axis according to y, adjusting the tested piece to move along the Y axis, and setting the motion displacement as y; 3) repeating steps 1) to 2), and stopping he plane motion adjustment till that the tested piece has an X-axis eccentricity x smaller than the set value x.sub.0 and a Y-axis eccentricity y smaller than the set value y.sub.0; the process of the rotation adjustment is as follows: 1) driving the tested piece to rotate at 360 through the air-floating shaft 24, and measuring a specified measuring cross-section 1 of the tested piece by using a sensor, to obtain the spatial coordinate (x.sub.1,y.sub.1,z.sub.1) of the fitting circle center of the cross-section 1; 2) driving the tested piece to rotate at 360 through the air-floating shaft 24, and measuring a specified measuring cross-section 2 of the tested piece by using a sensor, to obtain the spatial coordinate (x.sub.2,y.sub.2,z.sub.2) of the fining circle center of the cross-section 2; 3) calculating the spatial position of the geometric axis L of the tested piece from (x.sub.1,y.sub.1,z.sub.1) and (x.sub.2,y.sub.2,z.sub.2) and obtaining an angle .sub.x between the projection of the geometric axis L onto the plane determined by Y axis and Z axis and the Z axis and an angle .sub.y between the projection of the geometric axis L onto the plane determined by X axis and Z axis and the Z axis; 4) adjusting the tested piece to do a rotatory motion around the Y axis according to .sub.x, and connecting the driving system Q.sub.19 with the transmission part P.sub.111 provided on the table 2, so as to drive the table 2 to rotate around the Y axis; setting the angle of the rotatory motion as .sub.x; adjusting the tested piece to do a rotatory motion around the X axis according to .sub.y, and utilizing the elastic guide post 12 and the driving system Q.sub.2 13 which are provided on the base 3 along the Y axis, wherein the elastic guide post 12 contacts and fits with the guide block 14 provided on the table 2, so as to guide the table 2 to rotate around the X axis, and the driving system Q.sub.2 13 is connected with the transmission part P.sub.2 15 provided on the table 2, to drive the table 2 to rotate around the X axis; setting the angle of the rotatory motion as .sub.y, and thereby adjusting the geometric axis L of the tested piece to maximally coincide with the rotatory axis Z; 5) repeating steps 1) to 4), and stopping the rotation motion adjustment till the tested piece has an angle .sub.x between its projection of the geometric axis L onto the plane determined by Y axis and Z axis and the Z axis smaller than the set value .sub.x0, and an angle .sub.y between its projection of the geometric axis L onto the plane determined by X axis and Z axis and the Z axis smaller than the set value .sub.y0.