CN109341634A - Precision cast turbine blades molding surface size measurement method - Google Patents
Precision cast turbine blades molding surface size measurement method Download PDFInfo
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- CN109341634A CN109341634A CN201811443212.1A CN201811443212A CN109341634A CN 109341634 A CN109341634 A CN 109341634A CN 201811443212 A CN201811443212 A CN 201811443212A CN 109341634 A CN109341634 A CN 109341634A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/20—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring contours or curvatures, e.g. determining profile
Abstract
The invention discloses a kind of precision cast turbine blades molding surface size measurement methods, which comprises the following steps: calibration is for the calibration point with turbo blade type face contact, calibration point A on the gauge head of three-coordinates measuring machine；Appoint in the type face of the predetermined profile of turbo blade and takes a little as calibration point A to the anchor point for just finding positioning accurately, anchor point B；Adjustment gauge head height and the type face direction vector being adapted at anchor point B location, so that gauge head calibration point A is overlapped with anchor point B；Gauge head takes a round from anchor point B location along the machined surface profile row of predetermined profile, obtains the actual measurement CMM Data value in the type face of predetermined profile；CMM Data value is surveyed by practical three coordinate data values in the type face of the predetermined profile of radius compensation acquisition turbo blade.Entire measurement process is easy, and work efficiency is high, and measurement accuracy is high.It is suitable for the molding surface size measurement of various types of precision cast turbine blades.
Description
Technical field
The present invention relates to the molding surface size field of measuring technique of turbo blade, particularly, are related to a kind of hot investment casting turbine
Blade profile dimension measurement method.
Background technique
Turbo blade is the key components and parts of aero-engine, blade profile overall size and center required precision
It is high.For the design requirement for meeting turbo blade, every turbo blade cross section profile need to be detected, measurement accuracy directly understands shadow
Ring the performance for arriving aero-engine.Blade profile profile measurement is as shown in Figure 1.
Type face is measured along specified altitude assignment when detection.However, for blade root section with respect to blade tip section torsional angle compared with
When big, there are certain inclination angles with horizontal plane for blade longitudinal cross-section.Using three-dimensional coordinates measurement, due to the influence of measuring head radius, into
When row radius compensation, exist compared with large compensation error.
Calibration Procedure for Measuring Coordinate Error producing cause is as follows: when the blade profile of three-dimensional coordinates measurement blade profile height Z, measuring the ball centre of sphere
Along constant cross-section elevation carrection blade profile, measures ball (radius R) and line practical contact point A in blade longitudinal cross-section much deviates from this
The mathematical point B of section blade profile, and the measurement gained actual value C and mathematical point B of section blade profile still has after radius compensation
Gap.The distance δ of B point and C point is measurement error value.The blade root section turbo blade bigger with respect to blade tip section torsional angle, leaf
Type longitudinal cross-section line inclination angle theta is bigger, and measurement error value δ is also increased with it.As shown in Figure 2.
Summary of the invention
The present invention provides a kind of precision cast turbine blades molding surface size measurement methods, are cut with solving existing constant altitude
When planar survey blade profile, when carrying out radius compensation due to the influence of gauge head radius, after measurement, compensation error, and gauge head half are generated
The technical issues of diameter is bigger, and compensation error is bigger, seriously affects turbo blade measurement accuracy.
The present invention provides a kind of precision cast turbine blades molding surface size measurement method, comprising the following steps: in three coordinates
Calibration is for the calibration point with turbo blade type face contact, calibration point A on the gauge head of measuring instrument；In the pre-setting of turbo blade
The machined surface profile of face height, which is taken up an official post, to be taken a little as calibration point A to the anchor point for just finding positioning accurately, anchor point B；Adjust gauge head
Height and the type face direction vector being adapted at anchor point B location, so that gauge head calibration point A is overlapped with anchor point B；Gauge head is from calmly
Site B location takes a round along the machined surface profile row of predetermined profile, and the actual measurement three for obtaining the type face of predetermined profile is sat
Mark measured data values；Survey the type face that CMM Data value obtains the predetermined profile of turbo blade by radius compensation
Practical three coordinate data values.
Further, calibration point A is in the axially opposing measuring point vertex of three-coordinates measuring machine measuring rod, at this time measuring point vertex
Chong Die with the machined surface profile of predetermined profile, actual measurement CMM Data value carries out radius compensation by measuring point radius and obtains
Practical three coordinate data values.
Further, calibration point A be in deviate three-coordinates measuring machine measuring rod axial direction non-vertex position, calibration point A and
The blade profile longitudinal cross-section line inclination angle of turbo blade is θ, and actual measurement CMM Data value carries out half by measuring point radius and inclination angle theta
Diameter compensates to obtain practical three coordinate data values in the type face of the predetermined profile of turbo blade.
Further, big relative to blade tip section torsional angle when the blade root section of turbo blade, and lead to blade profile longitudinal cross-section
Line inclination angle theta is big, and measurement error value δ is increased with it, and measurement error value δ is caused by gauge head cosine radius compensation error, passes through at this time
The first subsidiary type face and the second subsidiary type face are looked in respective heights position above and below the type face of predetermined profile, lead to
It crosses two-wire mensuration and obtains the blade profile for corresponding to turbo blade on the first subsidiary type face and the second subsidiary type face
Inclination alpha obtains correct cosine offset, to correct practical three coordinate data values in the type face of predetermined profile, obtains
Accurate practical three coordinate data values.
Further, predetermined profile is Z, and pre-setting face short transverse unit length is taken to measure amphitypy face respectively for 1
Machined surface profile under height, upper and lower two profile is respectively Z1And Z2；Profile Z1And Z2Measuring point on two-dimensional surface under height
The level value of the centre of sphere is positioned as y(+0.5)And y(-0.5), then under predetermined profile on two-dimensional surface the measuring point centre of sphere level value
Are as follows:
When unit length 1 is sufficiently small, turbo blade axial direction upper curve can be approximated to be straight line, therefore,
Δ y=y (+0.5)-y (- 0.5) is enabled, then
It can be obtained according to above formula:
The measuring point center of circle is O point, sin α=cos θ in triangle OAB
Therefore,
It is y- δ so as to obtain actual measured value.
Further, gauge head includes measuring rod and measurement ball, and measurement ball is using measurement ball or measurement hemisphere.
Further, measurement ball surveys ball, zirconium oxide survey ball or ruby using silicon nitride and surveys ball.
Further, the contact site for measuring ball is arranged to the recessed portion being recessed inwardly, so that the concave edges of recessed portion
As contact site；Calibration point A is in the concave edges of recessed portion.
Further, recessed portion is annular in shape, and is annularly distributed in measurement ball surface along the circumferential direction of measuring rod.
Further, recessed portion deviates from the axis of measuring rod and is laid in measurement ball surface, by controlling measuring rod edge
It circumferentially rotates to adjust the direction of recessed portion.
The invention has the following advantages:
Precision cast turbine blades molding surface size measurement method of the present invention, by respectively on the gauge head of three-coordinates measuring machine
It sets calibration point A and sets anchor point B on the machined surface profile of predetermined profile, by making calibration point A's and anchor point B
Contact is overlapped matching, and ensures the calibration point A of gauge head when gauge head takes a round along the machined surface profile row of predetermined profile always
Contour line is fitted in, to improve the accuracy of actual measurement CMM Data value；It is obtained due to calibration point A and three-dimensional coordinates measurement
Relationship between data point position is known, therefore can be carried out by the known relation to actual measurement CMM Data value
Radius compensation, to obtain practical three coordinate data values.Entire measurement process is easy, and work efficiency is high, and measurement accuracy is high.It is suitable for
The molding surface size of various types of precision cast turbine blades measures.
Other than objects, features and advantages described above, there are also other objects, features and advantages by the present invention.
Below with reference to figure, the present invention is described in further detail.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram in the blade type face to be detected of precision cast turbine blades；
Fig. 2 is Calibration Procedure for Measuring Coordinate Error analysis schematic diagram；
Fig. 3 is the point touching mensuration signal of the precision cast turbine blades molding surface size measurement of the preferred embodiment of the present invention
Figure；
Fig. 4 is the structural schematic diagram of the precision cast turbine blades molding surface size measurement of the preferred embodiment of the present invention；
Fig. 5 is the two-wire mensuration signal of the precision cast turbine blades molding surface size measurement of the preferred embodiment of the present invention
Figure；
Fig. 6 is that the actual measured value conversion of the precision cast turbine blades molding surface size measurement of the preferred embodiment of the present invention obtains
Take schematic diagram.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be limited by following and
The multitude of different ways of covering is implemented.
Fig. 3 is the point touching mensuration signal of the precision cast turbine blades molding surface size measurement of the preferred embodiment of the present invention
Figure；Fig. 4 is the structural schematic diagram of the precision cast turbine blades molding surface size measurement of the preferred embodiment of the present invention；Fig. 5 is this hair
The two-wire mensuration schematic diagram of the precision cast turbine blades molding surface size measurement of bright preferred embodiment；Fig. 6 is of the invention preferred
The actual measured value conversion of the precision cast turbine blades molding surface size measurement of embodiment obtains schematic diagram.
As shown in Figure 3 and Figure 4, the precision cast turbine blades molding surface size measurement method of the present embodiment, including following step
Rapid: calibration is for the calibration point with turbo blade type face contact, calibration point A on the gauge head of three-coordinates measuring machine；In turbine
The machined surface profile of the predetermined profile of blade, which is taken up an official post, to be taken a little as calibration point A to the anchor point for just finding positioning accurately, anchor point
For B；Adjustment gauge head height and the type face direction vector being adapted at anchor point B location, so that gauge head calibration point A and anchor point B
It is overlapped；Gauge head takes a round from anchor point B location along the machined surface profile row of predetermined profile, obtains the type of predetermined profile
The actual measurement CMM Data value in face；Survey the pre-setting that CMM Data value obtains turbo blade by radius compensation
Practical three coordinate data values in the type face of face height.Precision cast turbine blades molding surface size measurement method of the present invention, by dividing
Calibration point A is set not on the gauge head of three-coordinates measuring machine and anchor point B is set on the machined surface profile of predetermined profile,
By making calibration point A contact with anchor point B be overlapped matching, and ensure that gauge head is walked along the machined surface profile of predetermined profile
The calibration point A of gauge head fits in contour line always when one circle, to improve the accuracy of actual measurement CMM Data value；Due to mark
The relationship pinpointed between the data point position that A and three-dimensional coordinates measurement obtain is known, therefore can pass through the known relation pair
It surveys CMM Data value and carries out radius compensation, to obtain practical three coordinate data values.Entire measurement process is easy, work
High-efficient, measurement accuracy is high.It is suitable for the molding surface size measurement of various types of precision cast turbine blades.
As shown in Figure 3 and Figure 4, in the present embodiment, calibration point A is in the axially opposing measuring point of three-coordinates measuring machine measuring rod
Vertex, measuring point vertex is Chong Die with the machined surface profile of predetermined profile at this time, and actual measurement CMM Data value passes through measuring point half
Diameter carries out radius compensation and obtains practical three coordinate data values.By the way that calibration point A setting is axial in three-coordinates measuring machine measuring rod
Opposite measuring point vertex, when so that calibration point A being bonded with anchor point B, the Y-axis of three-coordinates measuring machine and the pre-setting of turbo blade
The type face of face height is vertical, and gauge head takes a round along the machined surface profile row of predetermined profile from anchor point B location and surveyed at this time
Practical three coordinate data values can be obtained by increasing and decreasing the measurement radius of a ball R of gauge head in the actual measurement CMM Data value obtained.It can
Selection of land makes the pre-setting face of turbo blade by adjusting clamping in the posture of the fixture adjustment turbo blade at turbo blade both ends
The type face of height and the central axis of three-coordinates measuring machine measuring rod are in same plane, by rotation machined surface profile so that calibration point
A is bonded with anchor point B, is then starting the three-dimensional coordinates measurement to the machined surface profile.
As shown in Figure 3 and Figure 4, in the present embodiment, calibration point A is in the non-top for deviateing three-coordinates measuring machine measuring rod axial direction
The blade profile longitudinal cross-section line inclination angle of point position, calibration point A and turbo blade is θ, and actual measurement CMM Data value passes through measuring point
Radius and inclination angle theta progress radius compensation obtain practical three coordinate data values in the type face of the predetermined profile of turbo blade.It is real
In the measurement process of border, when gauge head being walked from anchor point B location along the machined surface profile of predetermined profile due to contacting with each other
Light deformation radially occurs for the measuring rod that the active force of generation will lead to gauge head, error is easy to produce, at this time by adjusting survey
The obliquity of gauge rod is consistent the axial direction of measuring rod with the direction for generating active force when contacting, makees to cut down contact
Firmly caused gauge head Light deformation phenomenon, to improve measurement accuracy.When especially measurement pole length is longer, which causes
Error it is bigger, it is therefore desirable to by being adjusted to face direction of the measuring rod relative to the type face of predetermined profile, with eliminate should
Error influences.
As shown in Figure 5 and Figure 6, in the present embodiment, when the blade root section of turbo blade is big relative to blade tip section torsional angle, and
Cause blade profile longitudinal cross-section line inclination angle theta big, measurement error value δ is increased with it, and measurement error value δ is missed by gauge head cosine radius compensation
Difference causes, at this time by above and below the type face of predetermined profile respective heights position look for the first subsidiary type face and second
Subsidiary type face is obtained by two-wire mensuration and corresponds to turbine on the first subsidiary type face and the second subsidiary type face
The blade profile inclination alpha of blade obtains correct cosine offset, so that correct the type face of predetermined profile practical three sit
Data value is marked, accurate practical three coordinate data values are obtained.When the blade root section of turbo blade is big relative to blade tip section torsional angle,
And causing blade profile longitudinal cross-section line inclination angle theta big, measurement error value δ is increased with it, when being measured at this time using point touching mensuration
It will receive the influence of gauge head cosine radius compensation error, and cause error of measured data excessive, be unable to satisfy hot investment casting turbine
The required precision of blade profile dimensional measurement, it is therefore desirable to use two-wire mensuration to measure with to measurement generate error into
Row amendment.And two-wire mensuration is used, two two-dimensional sections are chosen by corresponding in the type face upper and lower position of predetermined profile,
Only need to find out the inclination alpha in corresponding two-dimensional section blade type face, you can get it correct cosine offset, to obtain pre-
Determine the actual measured value of the molding surface size of profile.
As shown in Figure 5 and Figure 6, in the present embodiment, predetermined profile is Z, takes pre-setting face short transverse unit length
The machined surface profile under two profiles, upper and lower two profiles difference are measured respectively for 1 (wherein, 1 one unit length of expression)
For Z1And Z2；Profile Z1And Z2The level value of the measuring point centre of sphere is positioned as y on two-dimensional surface under height(+0.5)And y(-0.5), then exist
Under predetermined profile on two-dimensional surface the measuring point centre of sphere level value are as follows:
When unit length 1 is sufficiently small, turbo blade axial direction upper curve can be approximated to be straight line, therefore,
Δ y=y (+0.5)-y (- 0.5) is enabled, then
It can be obtained according to above formula:
The measuring point center of circle is O point, sin α=cos θ in triangle OAB
Therefore,
It is y- δ so as to obtain actual measured value.
In the present embodiment, gauge head includes measuring rod and measurement ball, and measurement ball is using measurement ball or measurement hemisphere.Measure ball
When using measurement ball, the contact area for measuring ball is big, when one timing of type face and gauge head relative position, measures the measurement of ball
Range is wider, and measurement angle is bigger.When measuring ball using measurement hemisphere, the radial dimension for measuring hemisphere can be with the diameter of measuring rod
It is consistent to size, can effectively reduce the radial dimension of measurement ball, and the radial dimension for measuring ball is smaller, radius compensation produces
Raw error is smaller, so as to improve measurement accuracy；In addition the radial dimension of contract measurement ball, additionally it is possible to reduce measurement when by
The interference arrived avoids measurement ball misconnection when to touch target position from contacting the error generated on other positions.Measuring rod
It needs that there is rigidity, is minimized with the amount of bow ensured in measurement process.Measuring rod may be used also other than it can use stainless steel
To use tungsten carbide bar, rigidity is big, designs convenient for minor diameter and beyond changing.Measuring rod can also use ceramic bar, rigidity
Due to steel pole, weight is light more than tungsten carbide.When measuring rod uses ceramic bar, it is crushed since gauge head is easy to happen collision,
Additional crash protection is needed to gauge head.The extremely light carbon fiber of weight is a kind of inert material, the characteristic and special resin base
Body, which combines, can have excellent protective action, have excellent damping property, can be used for the material as gauge head.
In the present embodiment, measurement ball surveys ball using silicon nitride, zirconium oxide surveys ball or ruby surveys ball.Scan aluminium or cast iron
When material, if can interact between two kinds of materials in contact process using ruby ball and generate and survey ball to ruby
The adhesion wear on surface, it is therefore desirable to which ball is surveyed using silicon nitride.Optionally, measurement ball can also use tool steel, such as T8A,
Or it can also by quenching hardness HRC55-60.
In the present embodiment, the contact site for measuring ball is arranged to the recessed portion being recessed inwardly, so that the recess side of recessed portion
Edge is as contact site；Calibration point A is in the concave edges of recessed portion.It is contacted by concave edges with target position, it can
Contact point is determined easily, it is ensured that the precision of contact position, and the relationship between the position and the measuring center position of gauge head is
It is known, therefore the size actual measured value in the type face of predetermined profile can be readily available.
In the present embodiment, recessed portion is annular in shape, and is annularly distributed in measurement ball surface along the circumferential direction of measuring rod.Facilitate calibration point A
Calibration, while edge calibration point A is aligned with the centering between anchor point B, can fast implement measurement, to improve measurement effect
Rate.
In the present embodiment, recessed portion deviates from the axis of measuring rod and is laid in measurement ball surface, by controlling measuring rod
It circumferentially rotates to adjust the direction of recessed portion.For turbo blade blade root section relative to the biggish shape of blade tip section torsional angle
Condition can enable the calibration point A being arranged on recessed portion to carry out easily with anchor point B by adjusting the direction of control recessed portion
Centering alignment, can fast implement measurement, to improve measurement efficiency.
When implementation, a kind of method of turbo blade profile measurement is specific as follows:
1, point touching mensuration.For accurately measurement type face data, the method is as follows: three coordinates are used according to pre-setting face track
Point contact method method measures specified profile type face, after measurement, carries out radius compensation.This method uses point-contact type face, surveys
Head adjustment centre of sphere height, self-adaptation type face direction vector, so that gauge head vertex A is overlapped with measuring point B on type face, to eliminate radius
Error is compensated, measurement accuracy is improved.As shown in Figure 3.
2, two-wire mensuration.By touching mensuration analysis of measurement errors it is found that measurement error is mainly gauge head cosine radius
Compensation error causes.Therefore, demand goes out corresponding two-dimensional section blade type face inclination alpha, you can get it correct cosine offset.
Two-wire measurement method is as follows: centered on specified cross-section height Z, taking short transverse unit length is 1, measures both heights respectively
(Z1And Z2) under machined surface profile, as shown in Figure 5 and Figure 6.
Predetermined profile is Z, and pre-setting face short transverse unit length is taken to measure the type under two profiles respectively for 1
Facial contour, upper and lower two profile is respectively Z1And Z2；Profile Z1And Z2Under height on two-dimensional surface the measuring point centre of sphere level
Value is positioned as y(+0.5)And y(-0.5), then under predetermined profile on two-dimensional surface the measuring point centre of sphere level value are as follows:
When unit length 1 is sufficiently small, turbo blade axial direction upper curve can be approximated to be straight line, therefore,
Δ y=y (+0.5)-y (- 0.5) is enabled, then
It can be obtained according to above formula:
The measuring point center of circle is O point, sin α=cos θ in triangle OAB
Therefore,
It is y- δ so as to obtain actual measured value.
Two-wire mensuration is easy to operate relative to touching mensuration, and work efficiency is high.
Certain aero-engine power turbine working-blade, blade profile is complicated, and blade root section is larger with respect to blade tip section torsional angle, adopts
It is accurate with touching mensuration and two-wire mensuration, measurement result.Using this method, the precision of measurement ensure that.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of precision cast turbine blades molding surface size measurement method, which comprises the following steps:
Calibration is for the calibration point with turbo blade type face contact, calibration point A on the gauge head of three-coordinates measuring machine；
Take up an official post the positioning taken Yi Dian as calibration point A to positioning is just found accurately in the machined surface profile of the predetermined profile of turbo blade
Point, anchor point B；
Adjustment gauge head height and the type face direction vector being adapted at anchor point B location, so that gauge head calibration point A and anchor point B
It is overlapped；
Gauge head takes a round from anchor point B location along the machined surface profile row of predetermined profile, obtains the type of predetermined profile
The actual measurement CMM Data value in face；
CMM Data value is surveyed by the reality three in the type face of the predetermined profile of radius compensation acquisition turbo blade
Coordinate data values.
2. precision cast turbine blades molding surface size measurement method according to claim 1, which is characterized in that
Calibration point A is in the axially opposing measuring point vertex of three-coordinates measuring machine measuring rod, and measuring point vertex and pre-setting face are high at this time
The machined surface profile of degree is overlapped,
Actual measurement CMM Data value carries out radius compensation by measuring point radius and obtains practical three coordinate data values.
3. precision cast turbine blades molding surface size measurement method according to claim 1, which is characterized in that
Calibration point A is in the non-vertex position for deviateing three-coordinates measuring machine measuring rod axial direction,
The blade profile longitudinal cross-section line inclination angle of calibration point A and turbo blade is θ,
Actual measurement CMM Data value carries out radius compensation by measuring point radius and inclination angle theta and obtains the pre-setting face of turbo blade
Practical three coordinate data values in the type face of height.
4. precision cast turbine blades molding surface size measurement method according to claim 1, which is characterized in that
When the blade root section of turbo blade is big relative to blade tip section torsional angle, and cause blade profile longitudinal cross-section line inclination angle theta big, measures
Error amount δ is increased with it, and measurement error value δ is caused by gauge head cosine radius compensation error, at this time by predetermined profile
Type face up and down respective heights position look for the first subsidiary type face and the second subsidiary type face,
The leaf for corresponding to turbo blade on the first subsidiary type face and the second subsidiary type face is obtained by two-wire mensuration
Piece type face inclination alpha, obtains correct cosine offset, to correct practical three coordinate datas in the type face of predetermined profile
Value,
Obtain accurate practical three coordinate data values.
5. precision cast turbine blades molding surface size measurement method according to claim 4, which is characterized in that
Predetermined profile is Z, and taking pre-setting face short transverse unit length is that the 1 type face measured under two profiles respectively is taken turns
Exterior feature, upper and lower two profile is respectively Z1And Z2；
Profile Z1And Z2The level value of the measuring point centre of sphere is positioned as y on two-dimensional surface under height(+0.5)And y(-0.5), then predetermined
Under profile on two-dimensional surface the measuring point centre of sphere level value are as follows:
When unit length 1 is sufficiently small, turbo blade axial direction upper curve can be approximated to be straight line, therefore,
Enable Δ y=y(+0.5)-y(-0.5), then
It can be obtained according to above formula:
The measuring point center of circle is O point, sin α=cos θ in triangle OAB
Therefore,
It is y- δ so as to obtain actual measured value.
6. precision cast turbine blades molding surface size measurement method according to any one of claim 1 to 5, feature exist
In,
Gauge head include measuring rod and measurement ball,
Ball is measured using measurement ball or measurement hemisphere.
7. precision cast turbine blades molding surface size measurement method according to claim 6, which is characterized in that
It measures ball and ball, zirconium oxide survey ball or ruby survey ball is surveyed using silicon nitride.
8. precision cast turbine blades molding surface size measurement method according to claim 6, which is characterized in that
The contact site of measurement ball is arranged to the recessed portion being recessed inwardly, so that the concave edges of recessed portion are as contact site；
Calibration point A is in the concave edges of recessed portion.
9. precision cast turbine blades molding surface size measurement method according to claim 8, which is characterized in that
Recessed portion is annular in shape, and is annularly distributed in measurement ball surface along the circumferential direction of measuring rod.
10. precision cast turbine blades molding surface size measurement method according to any one of claim 1 to 5, feature
It is,
Recessed portion deviates from the axis of measuring rod and is laid in measurement ball surface, is circumferentially rotated by controlling measuring rod to adjust
The direction of recessed portion.
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| CN113748310A (en) * | 2019-04-29 | 2021-12-03 | 赛峰飞机发动机公司 | Method for dimensional inspection of a turbomachine component |
| CN114719801A (en) * | 2022-03-30 | 2022-07-08 | 中国航发沈阳发动机研究所 | Turbine guide blade welding positioning method |
| CN114838643A (en) * | 2022-07-04 | 2022-08-02 | 西安西鹰精密机械有限责任公司 | Aero-engine blade superposed shaft reference detection device and method |
| CN117346722A (en) * | 2023-09-13 | 2024-01-05 | 华中科技大学 | Aeroengine blade profile contour measurement method based on three-coordinate measurement |
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