CN111975672A - Blade measuring clamp and measuring method - Google Patents
Blade measuring clamp and measuring method Download PDFInfo
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- CN111975672A CN111975672A CN202010723369.0A CN202010723369A CN111975672A CN 111975672 A CN111975672 A CN 111975672A CN 202010723369 A CN202010723369 A CN 202010723369A CN 111975672 A CN111975672 A CN 111975672A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000003825 pressing Methods 0.000 claims abstract description 53
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 239000013598 vector Substances 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 14
- 239000000523 sample Substances 0.000 claims description 5
- 238000011156 evaluation Methods 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 abstract 1
- 238000012545 processing Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000003754 machining Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000003302 ferromagnetic material Substances 0.000 description 2
- 230000005291 magnetic effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000011265 semifinished product Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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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
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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
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/0002—Arrangements for supporting, fixing or guiding the measuring instrument or the object to be measured
Abstract
The invention discloses a three-coordinate measuring clamp and a measuring method for a blade. The pressing block assembly comprises a pressing block, a cover plate, a guide groove plate, a guide plate, a pressing handle and an angle locking handle. The pressing block assembly is arranged on the fixed center and can rotate around the fixed center; the movable center seat is arranged on the upright post and can move up and down along the upright post. The measurement method adopts an iteration method to establish the coordinate system, only six characteristic points are needed to establish the coordinate system, and the method is simple. The measuring method realizes the batch detection of the blades and improves the measuring efficiency. The invention adopts the center holes at the two ends of the blade blank as the positioning reference, thereby improving the positioning precision, and the invention is suitable for the measurement and positioning of various types of blades due to the universality of the characteristics of the center holes at the end surfaces, and has strong universality; the clamping angle of the blade can be adjusted, and the three-coordinate measuring needle treading point is convenient.
Description
Technical Field
The invention relates to the technical field of blade measurement, in particular to a blade three-coordinate measuring clamp and a measuring method.
Background
The blade is a part with more size, complex shape and strict tolerance requirement, the quality of the whole process of blade processing and production is generally ensured by using three-coordinate measurement in the field of blades, and the three-coordinate measurement machine has the advantages of strong universality, good repeatability, strong stability, high detection precision and the like; when the three-coordinate measurement is carried out, the blade needs to be fixed on the working table surface by the auxiliary clamp and kept at the correct position, and if the positioning precision of the auxiliary clamp is poor, the accuracy of the measurement result is influenced.
The existing three-coordinate measurement generally adopts a rectangular magnetic chuck to position the blade, the positioning mode is only suitable for the finished product measurement of the blade and is not suitable for the measurement and positioning of a semi-finished product in the machining process, because the positioning surface of the semi-finished product is used for a blank surface, the appearance of each blank is not uniform, so that the accurate unification of the clamping position of the blade is difficult to ensure when positioning, the generated error is large, continuous clamping cannot be realized, and the advantage of good three-coordinate repeatability can not be exerted when facing mass production tasks, and the production efficiency of products is greatly influenced.
In the process of blade processing, in order to facilitate processing and clamping on a machine tool, process heads with certain length are reserved at two ends of a blank (square steel) and central holes are processed at end faces, the central holes at the two ends are used as process references of the blade, the process references penetrate through the whole process from rough processing and semi-finish processing to finish processing of the blade, and the central holes at the two ends of the blade are used as positioning references. The whole process of the blade needs to use three coordinates to carry out multiple measurements, because the positioning of the blade is related to the processing quality of the whole blade.
Disclosure of Invention
The invention aims to provide a three-coordinate measuring clamp and a measuring method which can quickly and repeatedly measure the blade quality.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a three-coordinate measuring clamp for a blade comprises a base, a fixed center and a movable center; the fixed center is arranged on the base, and the distance between the fixed center and the movable center in the vertical direction is adjustable; the fixed center cylindrical outer ring is provided with a pressing block assembly, and the angle of a clamped object can be limited by adjusting the pressing block assembly.
Furthermore, the pressing block assembly comprises a cover plate, a guide groove plate, a guide plate, a pressing handle and an angle locking handle; the fixed center penetrates through the center of the guide groove plate, sliding grooves are formed in two sides of the guide groove plate, the guide plate can slide along the sliding grooves, and the cover plate is arranged on the guide groove plate; the pressing handle is arranged on the guide plate, and the position of the guide plate on the guide groove plate can be adjusted by rotating the pressing handle; the angle locking handle is arranged on the guide groove plate and locks the deflection angle of the pressure block assembly through a rotation angle locking handle.
Furthermore, a return spring is arranged between the guide groove plate and the guide plate; one end of the reset spring is arranged in a round hole formed in the guide groove plate, and the other end of the reset spring is connected with the guide plate; the return spring is disposed at an opposite end of the compression handle.
Furthermore, a pressing block is connected to the guide plate through a bolt, the pressing block is arranged at the opposite end of the pressing handle, and the pressing block is used for limiting the position of the blade to be measured.
Furthermore, the movable center is arranged on the movable center seat, and the movable center seat can slide along the upright post.
Further, the handle is connected with the eccentric cam through a pin, and the movable center seat is loosened or fastened by rotating the eccentric cam.
Furthermore, a cylindrical through hole is formed in the center of the pressing block assembly, the cylindrical through hole can be in threaded fit with the fixed center, and the pressing block assembly can rotate around the fixed center.
Further, the fixed center is in threaded connection with the base.
Furthermore, the outer cylindrical surface of the fixed center is marked with angle scales, the deflection angle of the pressing block assembly relative to the fixed center is locked through the rotating angle locking handle, and the deflection angle is the deflection angle of the pressing block assembly, namely the deflection angle of the blade.
Furthermore, the base is made of ferromagnetic material.
Since the blade is generally fixed by the magnetic chuck, the fixture can be effectively fixed by the base made of ferromagnetic material.
The invention also provides a method for measuring the blade by three-coordinate measurement, which has the innovation points that: the method comprises the following specific steps:
firstly, establishing an initial coordinate system, and determining the position of a workpiece coordinate system in a machine tool coordinate system: and (3) introducing a blade model, and sequentially clicking 6 characteristic points on the model by using a mouse to obtain theoretical values of the blade model, wherein the 1 st point, the 2 nd point and the 3 rd point are in the same plane, the 4 th point and the 5 th point are in the same plane, and the 6 th point is in a separate plane. And switching the program mode to a manual mode, executing the program, manually measuring the elements according to prompts, and obtaining the measured values of the elements in the machine tool coordinate system. Establishing a coordinate system by using an iterative method, wherein the 1 st, the 2 nd and the 3 rd points are used as alignment characteristics, the 4 th and the 5 th points are rotation characteristics, and the 6 th point is an origin point characteristic;
secondly, establishing an accurate coordinate system: the program mode is switched to an automatic mode, the element point selection is the same as the method for establishing the initial coordinate in the first step, and only after the point selection of one plane is finished, a moving point is inserted, so that the probe cannot be impacted when moving to the next plane;
thirdly, measuring the evaluation size of the blade: the measuring needle steps on the surface of each feature of the blade to construct a required plane and a required straight line, evaluate the dimension of each feature of the blade and define a tolerance value;
according to the measuring method of the three-coordinate blade, during batch detection, after the 1 st blade is measured, the 2 nd blade is measured, the program directly starts from the second step of the measuring step, because the program of the second step is switched into an automatic mode, only the blade needs to be clamped at the correct position on the clamp, the second blade and the first blade can be ensured to be at the same machine tool coordinate system, and therefore the coordinate system can be directly and accurately determined;
according to the measuring method of the three-coordinate blade, the normal vectors of the 1 st, 2 nd and 3 rd characteristic points require consistent directions; the normal vector directions of the 4 th and 5 th features require the directions to be consistent, and the directions are perpendicular to the vector directions of the first three features; the normal vector direction of the 6 th feature and the normal vector direction of the first 5 features are required to be perpendicular to each other pairwise;
the measuring method of the three-coordinate blade is characterized in that for six feature points selected for establishing a coordinate system, the distance between the feature points in the same plane is the largest; the distance of the characteristic points is far, and the error of the determined coordinate system is smaller.
The invention has the following beneficial effects:
(1) the invention adopts the necessary process reference (end surface center hole) of the blade during processing as the positioning reference, the process reference runs through the whole process from rough machining and semi-finish machining to finish machining of the blade, and process heads are reserved when almost all the blades are processed to manufacture two sections of process holes. The positioning adopted by the invention has the reference of the structure of most of the blades, the application range of the clamp is not limited by the types and the structures of the blades, the application range is wide, the time for replacing the clamp is reduced, the actual production efficiency is greatly improved, and the enterprise cost is reduced.
(2) The clamping positioning datum of the invention is the same as the process datum in processing, namely a center hole of the section of the blade and a plane of the blade root are used as the positioning datum. The same datum is adopted to ensure that the position of each blade is the same, so that the detection precision is improved. And the positioning mode is reliable, and the positioning precision is improved.
(3) The movable center in the three-coordinate measuring fixture for the blades can move up and down along the upright post, the distance between the upright post and the center is relatively long, a large space range is provided, and the fixture can be suitable for measuring and clamping the blades with different lengths and sizes.
(4) The pressing block assembly in the three-coordinate measuring clamp for the blade can rotate around the fixed tip, the blade can deflect and be fixed at any angle during clamping, and the three-coordinate measuring probe can complete the measurement of the blade under the condition of changing the angle of the measuring probe as little as possible. The efficiency of measurement is improved to can reduce the risk that the firing pin appears when measuring, cause the three-coordinate measuring machine to break down.
(5) The deflection angle of the pressing block component is locked by the locking handle through the rotation angle, or the deflection angle of the pressing block component relative to the fixed center is displayed through the angle scales marked on the outer cylindrical surface of the fixed center, so that the deflection angle can be conveniently obtained.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the components of the compact of the present invention;
FIG. 3 is a partial schematic view of the handle and movable tip seat of the present invention;
FIG. 4 is a schematic view of the working state of the present invention;
FIG. 5 is a schematic three-dimensional structure of the present invention with the cover removed.
In the figure: 1-base, 2-briquetting component, 3-fixed centre, 4-movable centre seat, 5-movable centre, 6-eccentric cam, 7-pin, 8-handle, 9-upright column, 10-inner hexagonal screw, 11-pressing handle, 12-guide plate, 13-guide groove plate, 14-cover plate, 15-angle locking handle, 16-first inner hexagonal screw, 17-reset spring, 18-briquetting, 19-second inner hexagonal screw and 20-blade.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following first describes in detail embodiments according to the present invention with reference to the accompanying drawings
With reference to the attached drawings 1 and 5, the three-coordinate measuring clamp for the blade comprises a base 1, a fixed center 3, a movable center seat 4, an upright post 9, a pressing block assembly 2 and a handle 8; the base 1 is provided with a threaded through hole, the cylindrical surface at the lower end of the fixed center 3 is provided with an external thread matched with the base 1, the middle of the pressing block assembly 2 is provided with a cylindrical through hole capable of accommodating the fixed center 3, the fixed center 3 penetrates through the cylindrical through hole in the middle of the pressing block assembly 2 and is connected with the base 1 through a thread, the pressing block assembly 2 and the fixed center 3 form rotary connection, the pressing block assembly 2 can rotate around the fixed center 3, and the fixed center 3 is in threaded connection with the cylindrical through hole of the pressing block assembly 2; the transverse section of the guide part of the upright post 9 is trapezoidal, the lower end of the upright post 9 is provided with 3 countersunk holes which can be connected with three corresponding threaded holes on the side surface of the base 1 through hexagon socket head cap screws 10; the side of the upright post 9 is provided with scales for marking the distance between the movable centre 5 and the fixed centre 3. The movable center seat 4 is designed integrally, a trapezoidal through hole matched with the upright post 9 is formed in the movable center seat 4, the movable center seat 4 and the upright post 9 form sliding fit connection, and the movable center seat 4 can move up and down along the upright post 9; the overhanging tail end of the live center 4 is provided with a threaded hole, the live center 5 is provided with an external thread, and the live center seat 4 is connected with the live center 5 through the thread.
Referring to fig. 2, the pressing block assembly 2 includes a pressing handle 11, a guide plate 12, a guide groove plate 13, a cover plate 14, an angle locking handle 15, a first socket head cap screw 16, a return spring 17, a pressing block 18 and a socket head cap screw 19. The middle of the guide groove plate 13 is provided with a through hole, the fixing center 3 penetrates through the through hole, the cover plate 14 is provided with 5 counter bores, the guide groove plate 13 is provided with 5 corresponding threaded holes, the cover plate 14 is connected with the guide groove plate 13 through a first inner hexagonal stud 16, the cover plate 14 is provided with a through hole with the same diameter as that of the guide groove plate 13, the central axes of the two holes are superposed after assembly, and the formed through hole can be in rotating fit with the fixing center 3; after the guide groove plate 13 and the cover plate 14 are matched, two rectangular holes are formed, the rectangular holes can be matched with corresponding structures of the guide plate 12, and the guide plate 12 can move along the through groove of the guide groove plate 13 after being assembled; the cylindrical rod part of the pressing handle 11 is provided with threads, the guide plate 12 is provided with threads with the same specification, the pressing handle 11 is connected with the guide plate 12 through the threads, and a workpiece is pressed and fixed by utilizing the self-locking property of the threads; a counter bore with a certain depth is arranged on the side surface of the guide groove plate 13, the diameter of the counter bore is consistent with the outer diameter of the return spring 17, one end of the return spring 17 is arranged in the counter bore, the other end of the return spring is in contact with the guide plate 12, the return spring 17 is a compression spring and is always compressed, so that the return spring 17 is not easy to fall out; the pressing block 18 is L-shaped, the pressing block 18 is provided with two countersunk through holes, the guide plate 12 is provided with corresponding threaded holes, and the pressing block 18 is connected with the guide plate 12 through a second inner hexagonal stud 19. The cylindrical rod part of the angle locking handle 15 is provided with threads which can be matched with threaded through holes arranged on the side surface of the guide groove plate 13, after the angle is adjusted during clamping, the angle of the angle locking handle 15 is rotated, the front end surface of the cylindrical rod can be in contact with and pressed against the outer circle surface of the fixed center 3, and the pressing block assembly 2 is fixed at the current angle. The cylindrical outer circle part of the fixed centre 3 is marked with angle scales. The pressing block component 2 has two functions, namely a pressing function and an angle adjusting function.
With reference to fig. 3, the outer circle of one end of the handle 8 is provided with a thread which can be matched and connected with the screw hole on the eccentric cam 6; through holes with the same diameter are formed in the two ear plates of the eccentric cam 6 and the movable center seat 4, the diameter of the outer circle of the pin 7 is the same as the diameter of the eccentric cam 6, the eccentric cam 6 is connected with the movable center seat 4 through the pin 7, the eccentric cam 6 can be driven to rotate by swinging the handle 8 during working, and when the handle 8 is pressed downwards, the distance between the contact point of the eccentric cam 6 and the upright post 9 and the rotation center of the eccentric cam 6 is farther, so that the upright post 9 is pressed tightly, and the movable center seat 4 can not move any more; the contact surface part of the upright post 9 and the handle cam 6 is provided with protruding grains, when the handle 8 rotates downwards, the protruding grains on the surface can increase the friction force, the movable center seat 4 can be driven to move downwards by the friction force, and the workpiece can be more stably compressed. The cross-section of the upright 9 is trapezoidal. When the trapezoidal inclined plane is extruded, the centering performance can still be kept, the movable center 5 is always positioned right above the fixed center 3, and meanwhile, the friction force generated when the inclined plane is extruded is larger, so that the locking relation formed by the movable center seat 4 and the upright post 9 is more reliable.
With reference to fig. 4, when the three-coordinate blade measuring fixture is used, the handle 8 is swung upwards, the movable center 4 is moved to the scale position where the upright post 9 corresponds to the length of the blade 20 according to the length of the blade 20, the center hole at the root of the blade 20 is placed on the fixed center 3, then the center hole at the upper end face of the blade 20 is placed in the movable center 5, the movable center seat 4 is pressed downwards, the handle 8 is pressed downwards, and the movable center seat 4 can be locked. The hold-down handle 11 is then rotated so that the hold-down 18 is adjacent the root of the blade 20 until it contacts the craft head surface at the root of the blade 20, thereby holding down the blade 20. The blade 20 is adjusted to a proper angle so that the measuring needle can measure each measuring point, then the angle locking handle 15 is rotated clockwise, the pressing block assembly 2 is locked so as not to rotate, and the blade 20 is completely limited at this step so as to measure.
After the measurement is finished, the pressing handle 11 rotates anticlockwise, the pressing block 18 moves towards the direction far away from the blade 20 due to the elastic force of the return spring 17, the blade 20 can be released, then the handle 8 rotates upwards, the movable tip seat 4 and the upright post 9 are not pressed, the movable tip seat 4 can move upwards, and the blade 20 can be taken out of the clamp.
The invention also provides a method for measuring the blade by three coordinates, which is implemented as follows:
firstly, establishing an initial coordinate system, and determining the position of a workpiece coordinate system in a machine tool coordinate system: and (3) introducing a blade model, and sequentially clicking 6 characteristic points on the model by using a mouse to obtain theoretical values of the blade model, wherein the 1 st point, the 2 nd point and the 3 rd point are in the same plane, the 4 th point and the 5 th point are in the same plane, and the 6 th point is in a separate plane. And switching the program mode to a manual mode, executing the program, manually measuring the elements according to prompts, and obtaining the measured values of the elements in the machine tool coordinate system. And (3) establishing a coordinate system by using an iterative method, wherein the 1 st, 2 nd and 3 rd points are used as alignment features, the 4 th and 5 th points are rotation features, and the 6 th point is an origin feature.
Secondly, establishing an accurate coordinate system: and the program mode is switched to an automatic mode, the element points are selected in the same way as the initial coordinate establishment in the first step, and only after the point selection of one plane is finished, a moving point is inserted, so that the probe cannot be struck by the needle when moving to the next plane.
And thirdly, measuring the evaluation size of the blade. And (3) treading points on the characteristic surfaces of the blades by the measuring needle to construct a required plane and straight line, evaluating the characteristic dimensions of the blades and defining a tolerance value.
According to the method for measuring the three-coordinate blade, when the 1 st blade is measured in batch detection, the 2 nd blade is measured, the program directly starts from the second step of the measuring step, because the program of the second step is switched into an automatic mode, the second blade and the first blade can be ensured to be positioned in the same machine tool coordinate system only by clamping the blades at the correct positions on the clamp, and therefore the coordinate system can be directly and accurately determined.
According to the measuring method of the three-coordinate blade, the normal vectors of the 1 st, 2 nd and 3 rd characteristic points require consistent directions; the normal vector directions of the 4 th and 5 th features require the directions to be consistent, and the directions are perpendicular to the vector directions of the first three features; the normal vector direction of the 6 th feature and the normal vector direction of the first 5 features are required to be perpendicular to each other two by two.
According to the measuring method of the three-coordinate blade, for six feature points selected by establishing a coordinate system, the distance between the feature points in the same plane is the largest as possible. The distance of the characteristic points is far, and the error of the determined coordinate system is smaller.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (10)
1. A three-coordinate measuring clamp for a blade is characterized by comprising a base (1), a fixed center (3) and a movable center (5); the fixed center (3) is arranged on the base (1), and the distance between the fixed center (3) and the movable center (5) is adjustable in the vertical direction; the fixed center (3) is provided with the pressing block assembly (2) on the cylindrical outer ring, and the angle of a clamped object can be limited by adjusting the pressing block assembly (2).
2. Blade coordinate measuring fixture according to claim 1, characterized in that the pressure block assembly (2) comprises a cover plate (14), a guide slot plate (13), a guide plate (12), a pressing handle (11) and an angle locking handle (15); the fixed center (3) penetrates through the center of the guide groove plate (13), sliding grooves are formed in two sides of the guide groove plate (13), the guide plate (12) can slide along the sliding grooves, and the cover plate (14) is arranged on the guide groove plate (13); the pressing handle (11) is arranged on the guide plate (12), and the position of the guide plate (12) on the guide groove plate (13) can be adjusted by rotating the pressing handle (11); the angle locking handle (15) is arranged on the guide groove plate (13), and the deflection angle of the pressing block assembly (2) is locked by rotating the angle locking handle (15).
3. Blade coordinate measuring clamp according to claim 2, characterized in that a return spring (17) is provided between the guide slot plate (13) and the guide plate (12); one end of the return spring (17) is arranged in a round hole formed in the guide groove plate (13), and the other end of the return spring is connected with the guide plate (12); the return spring (17) is arranged at the opposite end of the pressing handle (11).
4. Blade coordinate measuring fixture according to claim 2, characterized in that a pressure piece (18) is bolted to the guide plate (12), the pressure piece (18) being arranged at the opposite end of the pressure handle (11), the pressure piece (18) being used to define the position of the blade (20) to be measured.
5. The clamp according to claim 1, characterized in that the live center (5) is arranged on a live center seat (4), and the live center seat (4) can slide along the upright (9).
6. Blade coordinate measuring clamp according to claim 5, characterized in that the handle (8) is connected to the eccentric cam (6) by means of a pin (7), and the movable nose cup (4) is released or tightened by turning the eccentric cam (6).
7. The three-coordinate blade measuring fixture according to claim 1, wherein the pressing block assembly (2) is provided with a cylindrical through hole in the center, the cylindrical through hole can be in threaded fit with the fixed tip (3), and the pressing block assembly (2) can rotate around the fixed tip (3).
8. Blade coordinate measuring clamp according to claim 1, characterized in that the fixed tip (3) is screwed to the base (1).
9. The three-coordinate blade measuring fixture according to claim 1, wherein the outer cylindrical surface of the fixed tip (3) is marked with an angle scale, and the deflection angle of the pressing block assembly (2) relative to the fixed tip (3), which is the deflection angle of the pressing block assembly (2), i.e., the deflection angle of the blade (20), is locked by the rotation angle locking handle (15).
10. The measuring method of the three-coordinate measuring clamp for the blade is characterized by comprising the following steps of:
firstly, establishing an initial coordinate system, and determining the position of a workpiece coordinate system in a machine tool coordinate system: introducing a blade model, and sequentially clicking 6 characteristic points on the model by using a mouse to obtain theoretical values of the blade model, wherein the 1 st, the 2 nd and the 3 rd points are in the same plane, the 4 th and the 5 th points are in the same plane, and the 6 th point is in a single plane; switching the program mode to a manual mode, executing the program, manually measuring the elements according to prompts, and obtaining the measured values of the elements in the machine tool coordinate system; establishing a coordinate system by using an iterative method, wherein the 1 st, the 2 nd and the 3 rd points are used as alignment characteristics, the 4 th and the 5 th points are rotation characteristics, and the 6 th point is an origin point characteristic;
secondly, establishing an accurate coordinate system: the program mode is switched to an automatic mode, the element point selection is the same as the method for establishing the initial coordinate in the first step, and only after the point selection of one plane is finished, a moving point is inserted, so that the probe cannot be impacted when moving to the next plane;
thirdly, measuring the evaluation size of the blade: the measuring needle steps on the surface of each feature of the blade to construct a required plane and a required straight line, evaluate the dimension of each feature of the blade and define a tolerance value;
in the step one), during batch detection, after the measurement of the 1 st blade is completed, the process of measuring the 2 nd blade directly starts from the second step of the measurement step, because the program of the second step is switched into an automatic mode, the second blade and the first blade can be ensured to be positioned in the same machine tool coordinate system only by clamping the blades at the correct positions on a clamp, and thus, the coordinate system can be directly and accurately determined;
the normal vectors of the 1 st, 2 nd and 3 rd feature points require consistent directions; the normal vector directions of the 4 th and 5 th features require the directions to be consistent, and the directions are perpendicular to the vector directions of the first three features; the normal vector direction of the 6 th feature and the normal vector direction of the first 5 features are required to be perpendicular to each other pairwise;
for the six feature points selected for establishing the coordinate system, the distance between the feature points in the same plane should be the largest, the distance between the feature points is far, and the error of the determined coordinate system is smaller.
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| CN202010723369.0A CN111975672B (en) | 2020-07-24 | 2020-07-24 | Blade measuring clamp and measuring method |
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| CN202010723369.0A CN111975672B (en) | 2020-07-24 | 2020-07-24 | Blade measuring clamp and measuring method |
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| CN111975672B CN111975672B (en) | 2021-11-16 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112729182A (en) * | 2021-01-19 | 2021-04-30 | 黄亮 | Method for establishing coordinate system in three-coordinate measuring electrode |
| CN113400850A (en) * | 2021-07-23 | 2021-09-17 | 无锡航亚科技股份有限公司 | Retrospective marking method for aviation precision-forged blade |
| CN114029097A (en) * | 2021-11-09 | 2022-02-11 | 泰州赛宝工业技术研究院有限公司 | Flat test piece measuring clamp for high-low temperature environment test chamber and test method thereof |
| CN114029671A (en) * | 2021-10-11 | 2022-02-11 | 江苏大学 | Flexible positioning device for lettering of end face of turbine stator blade and using method |
| CN114152147A (en) * | 2021-12-30 | 2022-03-08 | 中国科学院长春光学精密机械与物理研究所 | Quick clamping mechanism for sighting telescope |
| WO2024001128A1 (en) * | 2022-06-30 | 2024-01-04 | 无锡透平叶片有限公司 | Adjustable universal vertical clamp for cmm profile measurement of precision forged blade |
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| CN113400850A (en) * | 2021-07-23 | 2021-09-17 | 无锡航亚科技股份有限公司 | Retrospective marking method for aviation precision-forged blade |
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| CN114029671B (en) * | 2021-10-11 | 2024-03-19 | 江苏大学 | Flexible positioning device for engraving end faces of stationary blades of steam turbine and application method |
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| WO2024001128A1 (en) * | 2022-06-30 | 2024-01-04 | 无锡透平叶片有限公司 | Adjustable universal vertical clamp for cmm profile measurement of precision forged blade |
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Denomination of invention: A blade measurement fixture and measurement method Effective date of registration: 20231009 Granted publication date: 20211116 Pledgee: China Construction Bank Corporation jintan sub branch Pledgor: Jiangsu Tengyuan Machinery Technology Co.,Ltd. Registration number: Y2023980060253 |
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