Method for detecting blade size of integral impeller

Abstract

The invention relates to the technical field of integral impeller blade size detection, in particular to an integral impeller blade size detection method, which comprises the following steps of: establishing an initial entity coordinate system of an integral impeller by utilizing end plane characteristics and axis characteristics of the integral impeller to be detected; in the three-dimensional software, establishing a model coordinate system of the integral impeller model by utilizing the end plane characteristics and the axis characteristics of the integral impeller model to be detected; obtaining an initial entity coordinate system, and sequentially performing coarse adjustment operation and fine adjustment operation on the initial entity coordinate system to obtain an accurate entity coordinate system of the integral impeller; under an accurate entity coordinate system, vector points are collected in measurement software and are automatically detected through a three-coordinate measuring machine, so that the size of the whole impeller blade is obtained. According to the invention, the solid coordinate system and the model coordinate system coincide after coarse adjustment and fine adjustment, so that the integral impeller and the integral impeller model coincide, and the detection accuracy of the blade size of the integral impeller is improved.

Description

Technical Field

[0001] This invention relates to the field of integral impeller blade size detection technology, and in particular to a method for detecting the size of integral impeller blades. Background Technology

[0002] An integral impeller refers to an impeller structure where the blades and hub (or disc) are machined as a single unit, rather than the traditional separate welded or riveted impeller structure. The blades and hub are seamless, forming a continuous flow channel, significantly improving aerodynamic performance and structural strength. Integral impellers are key power components in aerospace, water conservancy, and hydropower industries; the blade structure and surface finish quality have a significant impact on equipment lifespan and conversion efficiency. To improve the isentropic efficiency of the impeller and minimize weight, the blades utilize free-form surfaces, characterized by large twist angles, high curvature, small thickness, and high machining difficulty. Furthermore, with societal development, the requirements for machining precision are increasing. Therefore, we urgently need a method for measuring the dimensions of integral impeller blades.

[0003] The dimensional inspection of such parts is difficult because their features are not obvious, making it hard to establish a coordinate system using the traditional "321 method." In actual inspection, additional positioning features (such as positioning holes and flat keys) are added to the part and removed after inspection. However, the part will deform due to cutting forces, introducing new errors that affect the accuracy of the inspection results. Currently, manufacturers of coordinate measuring machines (CMMs) offer corresponding modules (such as Hexagon impeller inspection modules and Zeiss impeller inspection solutions). These modules are expensive, and for parts with similar impeller structures (such as gears), additional modules need to be purchased, resulting in high inspection costs.

[0004] Currently, 3D scanning inspection of complex parts is only used in situations where high precision is not required. For smooth curved surfaces, it is necessary to spray a developer on the surface of the part. This operation will affect the accuracy of the inspection. In addition, the spraying and removal of the developer will cause secondary damage to the part. Summary of the Invention

[0005] In response to the shortcomings of the existing production technology, the applicant provides a method for detecting the size of integral impeller blades. By improving the detection method of integral impeller blade size, the accuracy of the detection of integral impeller blade size can be improved, and damage to the integral impeller caused by spraying and removing developer can also be avoided.

[0006] The technical solution adopted in this invention is as follows:

[0007] A method for detecting the dimensions of an integral impeller blade includes the following steps:

[0008] S1. Establish the initial solid coordinate system S of the integral impeller using the end plane features and axis features of the integral impeller to be inspected. W1 ;

[0009] S2. In 3D software, the model coordinate system S of the integral impeller model is established using the end plane features and axis features of the integral impeller model to be inspected. C ;

[0010] S3. Obtain the initial entity coordinate system S in S1. W1 And sequentially apply this to the initial entity coordinate system S W1 Perform coarse and fine adjustments until the measurement deviation is less than the detection accuracy of the coordinate measuring machine, in order to obtain the precise solid coordinate system S of the entire impeller. W2 ;

[0011] S4, in the precise solid coordinate system S W2 The vector points are collected in the measurement software and automatically detected by a coordinate measuring machine to obtain the overall dimensions of the impeller blades.

[0012] Therefore, a coordinate system is established based on the end plane and axis features of the integral impeller. After coarse and fine adjustments are made to the established coordinate system, the integral impeller blades are then inspected. Compared with the existing inspection method of spraying developer, this method makes the entity coordinate system coincide with the model coordinate system through coarse and fine adjustments, thereby making the integral impeller coincide with the integral impeller model. This improves the accuracy of the integral impeller blade size inspection and avoids damage to the integral impeller caused by spraying and removing developer.

[0013] Furthermore, in S1, the initial solid coordinate system S of the integral impeller is determined by the end plane features, axis features, and any straight line feature on the end plane features. W1 .

[0014] Furthermore, in S2, within the 3D software, the overall impeller model and the model coordinate system S are adjusted. C The corresponding positional relationship between them, so that the model coordinate system S C Z C The shaft lies on the axial feature of the overall impeller model, and Z... C The axis is oriented upwards, so that X C O C Y C The plane lies on the end plane feature of the overall impeller model, and X C axis and Y C The axis direction satisfies the Cartesian coordinate system, and a blade is selected as the measurement reference for the overall impeller model.

[0015] Furthermore, in S3, the probe is used to collect the end plane features and axis features of the entire impeller, so that the coarse coordinate system S W3 Z W3 The shaft lies on the axial characteristic of the integral impeller, and Z W3 The axis is oriented upwards, so that X... W3 O W3 Y W3 The plane lies on the end plane feature of the overall impeller model. An arbitrary straight line is chosen as the X-axis on the end plane feature of the overall impeller. W3 axial direction, Y W3 The axis satisfies the Cartesian coordinate system, and a blade is selected as the measurement reference.

[0016] Furthermore, in S3, the coarse adjustment operation includes the following steps:

[0017] S3-1. Obtain the overall impeller model from S2 and import it into the measurement software;

[0018] S3-2, Rotated Model Coordinate System S C So that the model coordinate system S C With the initial entity coordinate system S W1 overlap;

[0019] S3-3. A point P1 on the entire impeller blade is acquired using a probe, in the initial solid coordinate system S W1 Below, the coordinates of point P1 are (x W10 y W10 z W10 );

[0020] S3-4. Obtain the intersection point P2 of the blades of the overall impeller model in the model coordinate system S. C Below, the coordinates of point P2 are (x C0 y C0 z C0 );

[0021] S3-5, Obtain the coordinates of point P1 in S3-3 (x... W10 y W10 z W10 The coordinates of point P2 in S3-4 are (x C0 y c0 z C0 ), to calculate the first vector (x) c0 y C0 From 0 to the second vector (x) W10 y W10 The first directed included angle θ0 between the two points (0, 0).

[0022] S3-6. In the measurement software, using the initial entity coordinate system SW1 Z W1 Using the axis as the rotation axis, the initial solid coordinate system S W1 Rotate by the first directed angle θ0 to obtain a coarse coordinate system S. W3 The entire impeller model and the model coordinate system S are rotated by the first directional included angle θ0. C To obtain the rotated overall impeller model and the model coordinate system S C .

[0023] Further, S3-4 includes the following steps:

[0024] S3-4-1, Based on the coordinates of point P1 (x W10 x W10 z W10 To determine the distance from point P1 to the initial entity coordinate system S W1 Z W1 Distance r of the axis W10 ;

[0025] S3-4-2. In the overall impeller model, with distance r W10 With radius as the model coordinate system S C Z C With the axis as the center, in Z C =z W10 Draw a circle on the plane;

[0026] S3-4-3. Obtain the circle from S3-4-2 and make it intersect with the blades of the overall impeller model. Take the intersection point P2, which is on the same side as point P1 of the overall impeller. The model coordinate system S C Below, the coordinates of point P2 are (x C0 y C0 z C0 ).

[0027] Furthermore, in S3, the fine-tuning operation includes the following steps:

[0028] S3-A. Select a vector point P3 at the center of the blade of the integral impeller model, and in the model coordinate system S C Below, the coordinates of vector point P3 are (x C1 y C1 z C1 ), the normal vector is (n xC1 n yC1 n zC1 );

[0029] S3-B, Move the probe along the normal vector in S3-A to acquire point P2 on the entire impeller, in the coarse coordinate system S W3 Below, the coordinates of point P2 are (x W30 yW30 z W30 );

[0030] S3-C, Obtain the coordinates of vector point P3 in S3-A (x C1 y C1 z C1 The coordinates of point P2 in S3-B are (x W30 y W30 z W30 ), to calculate the third vector (x) C1 y C1 From 0 to the fourth vector (x) W30 y W30 The second directed included angle θ1 of (0, 0);

[0031] S3-D, using the coarse coordinate system S W3 Z W3 Using the axis as the axis of rotation, the coarse coordinate system S... W3 Rotate by the second oriented angle θ1 to obtain the accurate solid coordinate system S. W2 The entire impeller model and the model coordinate system S are rotated by a second directional included angle θ1. C To obtain the rotated overall impeller model and the model coordinate system S C ;

[0032] S3-E, repeat S3-A to S3-D until the measurement deviation is less than the detection accuracy of the coordinate measuring machine, so as to obtain the accurate solid coordinate system S of the integral impeller. W2 ;

[0033] In S3-E, obtain the coordinates of vector point P3 in S3-A (x C1 y C1 z C1 The coordinates of point P2 in S3-B are (x W30 y W30 z W30 ), to obtain the distance between point P3 and point P2;

[0034] In S3-E, during the repetition of S3-A to S3-D, the coordinates (x, y, y) of vector point P3 are... C1 y C1 z C1 ), the coordinates of the normal vector (n) xC1 n yC1 n zC1 It remains unchanged;

[0035] Wherein: the distance between point P3 and point P2 represents the measurement deviation.

[0036] Furthermore, in S3, vectors in the same plane to vector The formula for calculating the directed angle θ is:

[0037]

[0038] Furthermore, in S3, the known vector vector and vectors sum vector Normal vector of the plane Establish vectors sum vector orthogonal basis of the plane

[0039] orthogonal basis The expression is:

[0040]

[0041] orthogonal basis The expression is:

[0042]

[0043] vector orthogonal basis projection The expression is:

[0044]

[0045] Furthermore, the axis feature refers to the rotation center line of the integral impeller; the end plane feature refers to the plane feature perpendicular to the axis feature.

[0046] The beneficial effects of this invention are as follows:

[0047] A coordinate system is established based on the end plane and axis features of the integral impeller. After coarse and fine adjustments to the established coordinate system, the integral impeller blades are then inspected. Compared with the existing inspection method of spraying developer, this method makes the entity coordinate system coincide with the model coordinate system through coarse and fine adjustments, thereby making the integral impeller coincide with the integral impeller model. This improves the accuracy of the integral impeller blade size inspection and avoids damage to the integral impeller caused by spraying and removing developer. Attached Figure Description

[0048] Figure 1 This is a flowchart of the method for detecting the overall impeller blade dimensions according to the present invention;

[0049] Figure 2 This is a schematic diagram of the overall impeller structure of the present invention;

[0050] Figure 3 The initial entity coordinate system S of this invention W1 Renderings;

[0051] Figure 4 The model coordinate system S of this invention C Renderings;

[0052] Figure 5 This is a diagram showing the positional relationship between the integral impeller blades and the blades of the integral impeller model of the present invention;

[0053] Figure 6 This is a diagram illustrating the effect of the coarse adjustment operation of the present invention;

[0054] Figure 7 This is a diagram illustrating the overall impeller blade inspection effect of the present invention. Detailed Implementation

[0055] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0056] like Figures 1 to 7 The diagram shows the preferred embodiment of the present invention. The method for detecting the overall impeller blade size in this embodiment includes the following steps:

[0057] S1. Establish the initial solid coordinate system S of the integral impeller using the end plane features and axis features of the integral impeller to be inspected. W1 ;

[0058] S2. In 3D software, the model coordinate system S of the integral impeller model is established using the end plane features and axis features of the integral impeller model to be inspected. C ;

[0059] S3. Obtain the initial entity coordinate system S in S1. W1 And sequentially apply this to the initial entity coordinate system S W1 Perform coarse and fine adjustments until the measurement deviation is less than the detection accuracy of the coordinate measuring machine, in order to obtain the precise solid coordinate system S of the entire impeller. W2 ;

[0060] S4, in the precise solid coordinate system S W2The following steps involve acquiring vector points in the measurement software and automatically detecting them using a coordinate measuring machine to obtain the dimensions of the overall impeller blades. Based on the end plane and axis features of the overall impeller, a coordinate system is established. After coarse and fine adjustments to the established coordinate system, the overall impeller blades are then inspected. Compared to existing methods that use developer spraying, this method, through coarse and fine adjustments, ensures that the entity coordinate system coincides with the model coordinate system, thereby aligning the overall impeller with the overall impeller model. This improves the accuracy of the overall impeller blade dimension detection and avoids damage to the overall impeller caused by the spraying and removal of developer.

[0061] In this embodiment, in S1, the initial solid coordinate system S of the integral impeller is determined by the end plane features, axis features, and any straight line feature on the end plane features. W1 .

[0062] In this embodiment, in step S2, the overall impeller model and the model coordinate system S are adjusted in the 3D software. C The corresponding positional relationship between them, so that the model coordinate system S C Z C The shaft lies on the axial feature of the overall impeller model, and Z... C The axis is oriented upwards, so that X C O C Y C The plane lies on the end plane feature of the overall impeller model, and X C axis and Y C The axis direction satisfies the Cartesian coordinate system, and a blade is selected as the measurement reference for the overall impeller model.

[0063] In this embodiment, in step S3, a probe is used to collect the end plane features and axis features of the entire impeller, so that the coarse coordinate system S... W3 Z W3 The shaft lies on the axial characteristic of the integral impeller, and Z W3 The axis is oriented upwards, so that X... W3 O W3 Y W3 The plane lies on the end plane feature of the overall impeller model. An arbitrary straight line is chosen as the X-axis on the end plane feature of the overall impeller. W3 axial direction, Y W3 The axis satisfies the Cartesian coordinate system, and a blade is selected as the measurement reference.

[0064] In this embodiment, the coarse adjustment operation in step S3 includes the following steps:

[0065] S3-1. Obtain the overall impeller model from S2 and import it into the measurement software;

[0066] S3-2, Rotated Model Coordinate System S C So that the model coordinate system S C With the initial entity coordinate system S W1 overlap;

[0067] S3-3. A point P1 on the entire impeller blade is acquired using a probe, in the initial solid coordinate system S W1 Below, the coordinates of point P1 are (x W10 y W10 z W10 );

[0068] S3-4. Obtain the intersection point P2 of the blades of the overall impeller model in the model coordinate system S. C Below, the coordinates of point P2 are (x C0 y C0 z C0 );

[0069] S3-5, Obtain the coordinates of point P1 in S3-3 (x... W10 y W10 z W10 The coordinates of point P2 in S3-4 are (x C0 y C0 z C0 ), to calculate the first vector (x) C0 y C0 From 0 to the second vector (x) W10 y W10 The first directed included angle θ0 between the two points (0, 0).

[0070] S3-6. In the measurement software, using the initial entity coordinate system S W1 Z W1 Using the axis as the rotation axis, the initial solid coordinate system S W1 Rotate by the first directed angle θ0 to obtain a coarse coordinate system S. W3 The entire impeller model and the model coordinate system S are rotated by the first directional included angle θ0. C To obtain the rotated overall impeller model and the model coordinate system S C Specifically, the coarse coordinate system S is roughly determined through coarse adjustment operations. W3 The posture is adjusted so that the overall impeller is nearly identical to the overall impeller model.

[0071] In this embodiment, S3-4 includes the following steps:

[0072] S3-4-1, Based on the coordinates of point P1 (x W10 y W10 z W10 To determine the distance from point P1 to the initial entity coordinate system SW1 Z W1 Distance r of the axis W10 ;

[0073] S3-4-2. In the overall impeller model, with distance r W10 With radius as the model coordinate system S C Z C With the axis as the center, in Z C =z W10 Draw a circle on the plane;

[0074] S3-4-3. Obtain the circle from S3-4-2 and make it intersect with the blades of the overall impeller model. Take the intersection point P2, which is on the same side as point P1 of the overall impeller. The model coordinate system S C Below, the coordinates of point P2 are (x C0 y C0 z C0 ).

[0075] In this embodiment, the fine-tuning operation in S3 includes the following steps:

[0076] S3-A. Select a vector point P3 at the center of the blade of the integral impeller model, and in the model coordinate system S C Below, the coordinates of vector point P3 are (x C1 y C1 z C1 ), the normal vector is (n xC1 n yC1 n zC1 );

[0077] S3-B, Move the probe along the normal vector in S3-A to acquire point P2 on the entire impeller, in the coarse coordinate system S W3 Below, the coordinates of point P2 are (x W30 y W30 z W30 );

[0078] S3-C, Obtain the coordinates of vector point P3 in S3-A (x C1 y C1 z C1 The coordinates of point P2 in S3-B are (x W30 y W30 z W30 ), to calculate the third vector (x) C1 y C1 From 0 to the fourth vector (x) W30 y W30 The second directed included angle θ1 of (0, 0);

[0079] S3-D, using the coarse coordinate system SW3 Z W2 Using the axis as the axis of rotation, the coarse coordinate system S... W3 Rotate by the second oriented angle θ1 to obtain the accurate solid coordinate system θ. w2 The entire impeller model and the model coordinate system S are rotated by a second directional included angle θ1. C To obtain the rotated overall impeller model and the model coordinate system S C ;

[0080] S3-E, repeat S3-A to S3-D until the measurement deviation is less than the detection accuracy of the coordinate measuring machine, so as to obtain the accurate solid coordinate system S of the integral impeller. W2 ;

[0081] In S3-E, the coordinates of vector point P3 in S3-A are obtained as 9x. C1 y C1 z C1 The coordinates of point P2 in S3-B are (x W30 y W30 z W30 ), to obtain the distance between point P3 and point P2;

[0082] In S3-E, during the repetition of S3-A to S3-D, the coordinates (x, y, y) of vector point P3 are... C1 y C1 z C1 ), the coordinates of the normal vector (n) xC1 n yC1 n zC1 It remains unchanged;

[0083] Wherein: the distance between point P3 and point P2 represents the measurement deviation.

[0084] Specifically, fine-tuning is performed to ensure that the integral impeller coincides with the integral impeller model.

[0085] It should be noted that in the initial entity coordinate system S W1 Let's take the coordinates of point P1 (6.406, 26.504, -22.776) as an example for further explanation:

[0086] 1. From point P1 to the initial entity coordinate system S W1 Z W1 Distance r of the axis W10 =27.267;

[0087] II. In the model coordinate system S C Below, the coordinates of point P2 are (6.645, 26.448, -22.776).

[0088] 3. The first directed angle θ0 between the first vector (6.645, 26.448, 0) and the second vector (6.406, 26.504, 0) is +0.516°.

[0089] IV. The coordinates of vector point P3 are (6.646, 26.445, -22.776), and the normal vector is (-0.903, 0.093, 0.419).

[0090] V. In the coarse coordinate system S W3 Below, the coordinates of point P2 are (6.730, 26.437, -22.816);

[0091] VI. The second directional angle θ1 between the third vector (6.646, 26.445, 0) and the fourth vector (6.730, 26.437, 0) is -0.175°.

[0092] In this embodiment, in S3, vectors in the same plane to vector The formula for calculating the directed angle θ is:

[0093]

[0094] Given vectors vector and vectors sum vector Normal vector of the plane Establish vectors sum vector orthogonal basis of the plane

[0095] orthogonal basis The expression is:

[0096]

[0097] orthogonal basis The expression is:

[0098]

[0099] vector orthogonal basis projection The expression is:

[0100]

[0101] In this embodiment, the axis feature refers to the rotation center line of the integral impeller; the end plane feature refers to the plane feature perpendicular to the axis feature.

[0102] In summary, this invention establishes a coordinate system based on the end plane and axis features of the integral impeller. After coarse and fine adjustments to the established coordinate system, the integral impeller blades are then inspected. Compared to existing inspection methods that use developer spraying, this method ensures that the entity coordinate system coincides with the model coordinate system through coarse and fine adjustments, thereby coinciding the integral impeller with the integral impeller model. This improves the accuracy of the integral impeller blade size inspection and avoids damage to the integral impeller caused by the spraying and removal of developer.

[0103] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A method for detecting the dimensions of an integral impeller blade, characterized in that, Includes the following steps: S1. Establish the initial solid coordinate system S of the integral impeller using the end plane features and axis features of the integral impeller to be inspected. W1 ; S2. In 3D software, the model coordinate system S of the integral impeller model is established using the end plane features and axis features of the integral impeller model to be inspected. C ; S3. Obtain the initial entity coordinate system S in S1. W1 And sequentially apply this to the initial entity coordinate system S W1 Perform coarse and fine adjustments until the measurement deviation is less than the detection accuracy of the coordinate measuring machine, in order to obtain the precise solid coordinate system S of the entire impeller. W2 ; S4, in the precise solid coordinate system S W2 The vector points are collected in the measurement software and automatically detected by a coordinate measuring machine to obtain the overall dimensions of the impeller blades.

2. The method for detecting the overall impeller blade dimensions as described in claim 1, characterized in that: In S1, the initial solid coordinate system S of the integral impeller is determined by the end plane features, axis features, and any straight line feature on the end plane features. W1 .

3. The method for detecting the overall impeller blade dimensions as described in claim 1, characterized in that: In S2, within the 3D software, adjust the overall impeller model and the model coordinate system S. C The corresponding positional relationship between them, so that the model coordinate system S C Z C The shaft lies on the axial feature of the overall impeller model, and Z... C The axis is oriented upwards, so that X C O C Y C The plane lies on the end plane feature of the overall impeller model, and X C axis and Y C The axis direction satisfies the Cartesian coordinate system, and a blade is selected as the measurement reference for the overall impeller model.

4. The method for detecting the overall impeller blade dimensions as described in claim 1, characterized in that: In S3, the probe is used to collect the end plane features and axis features of the entire impeller, so that the coarse coordinate system S W3 Z W3 The shaft lies on the axial characteristic of the integral impeller, and Z W3 The axis is oriented upwards, so that X... W3 O W3 Y W3 The plane lies on the end plane feature of the overall impeller model. An arbitrary straight line is chosen as the X-axis on the end plane feature of the overall impeller. W3 axial direction, Y W3 The axis satisfies the Cartesian coordinate system, and a blade is selected as the measurement reference.

5. The method for detecting the overall impeller blade dimensions as described in claim 1, characterized in that: In S3, the coarse adjustment operation includes the following steps: S3-1. Obtain the overall impeller model from S2 and import it into the measurement software; S3-2, Rotated Model Coordinate System S C So that the model coordinate system S C With the initial entity coordinate system S W1 overlap; S3-3. A point P1 on the entire impeller blade is acquired using a probe, in the initial solid coordinate system S W1 Below, the coordinates of point P1 are (x W10 y v10 z W10 ); S3-4. Obtain the intersection point P2 of the blades of the overall impeller model in the model coordinate system S. C Below, the coordinates of point P2 are (x C0 y C0 z C0 ); S3-5, Obtain the coordinates of point P1 in S3-3 (x... W10 y W10 z W10 The coordinates of point P2 in S3-4 are (x C0 y C0 z C0 ), to calculate the first vector (x) C0 y C0 From 0 to the second vector (x) W10 y W10 The first directed included angle θ0 between the two points (0, 0). S3-6. In the measurement software, using the initial entity coordinate system S W1 Z W1 Using the axis as the rotation axis, the initial solid coordinate system S W1 Rotate by the first directed angle θ0 to obtain a coarse coordinate system S. W3 The entire impeller model and the model coordinate system S are rotated by the first directional included angle θ0. C To obtain the rotated overall impeller model and the model coordinate system S C .

6. The method for detecting the overall impeller blade dimensions as described in claim 5, characterized in that: S3-4 includes the following steps: S3-4-1, Based on the coordinates of point P1 (x W10 x W10 z W10 To determine the distance from point P1 to the initial entity coordinate system S W1 Z W1 Distance r of the axis W10 ; S3-4-2. In the overall impeller model, with distance r W10 With radius as the model coordinate system S C Z C With the axis as the center, in Z C =z W10 Draw a circle on the plane; S3-4-3. Obtain the circle from S3-4-2 and make it intersect with the blades of the overall impeller model. Take the intersection point P2, which is on the same side as point P1 of the overall impeller. The model coordinate system S C Below, the coordinates of point P2 are (x C0 y C0 z C0 ).

7. The method for detecting the overall impeller blade dimensions as described in claim 1, characterized in that: In S3, the fine-tuning operation includes the following steps: S3-A. Select a vector point P3 at the center of the blade of the integral impeller model, and in the model coordinate system S C Below, the coordinates of vector point P3 are (x C1 y C1 z C1 The normal vector is 9n. xC1 n yC1 n zC1 ); S3-B, Move the probe along the normal vector in S3-A to acquire point P2 on the entire impeller, in the coarse coordinate system S W3 Below, the coordinates of point P2 are (x W30 y W30 z W30 ); S3-C, Obtain the coordinates of vector point P3 in S3-A (x C1 y C1 z C1 The coordinates of point P2 in S3-B are (x W30 y W30 z W30 ), to calculate the third vector 9x C1 y C1 From 0 to the fourth vector (x) W30 y W30 The second directed included angle θ1 of (0, 0); S3-D, using the coarse coordinate system S W3 Z W3 Using the axis as the axis of rotation, the coarse coordinate system S... W3 Rotate by the second oriented angle θ1 to obtain the accurate solid coordinate system S. W2 The entire impeller model and the model coordinate system S are rotated by a second directional included angle θ1. C To obtain the rotated overall impeller model and the model coordinate system S C ; S3-E, repeat S3-A to S3-D until the measurement deviation is less than the detection accuracy of the coordinate measuring machine, so as to obtain the accurate solid coordinate system S of the integral impeller. W2 ; In S3-E, obtain the coordinates of vector point P3 in S3-A (x C1 y C1 z C1 The coordinates of point P2 in S3-B are (x W30 y W30 z W30 ), to obtain the distance between point P3 and point P2; In S3-E, during the repetition of S3-A to S3-D, the coordinates (x, y, y) of vector point P3 are... C1 y C1 z C1 ), the coordinates of the normal vector (n) xC1 n yC1 n zC1 It remains unchanged; Wherein: the distance between point P3 and point P2 represents the measurement deviation.

8. The method for detecting the dimensions of an integral impeller blade as described in claim 1, characterized in that: In S3, vectors in the same plane to vector The formula for calculating the directed angle θ is:

9. The method for detecting the overall impeller blade dimensions as described in claim 8, characterized in that: In S3, the known vector vector and vectors sum vector Normal vector of the plane Establish vectors sum vector orthogonal basis of the plane orthogonal basis The expression is: orthogonal basis The expression is: vector orthogonal basis projection The expression is:

10. The method for detecting the overall impeller blade dimensions as described in claim 1, characterized in that: Axis characteristics refer to: The rotation centerline of the integral impeller; End-plane features refer to: Planar features perpendicular to the axis features.

Images