CN110319801B - Three-coordinate measuring clamp for circular arc bottom surface tenon blade - Google Patents
Three-coordinate measuring clamp for circular arc bottom surface tenon blade Download PDFInfo
- Publication number
- CN110319801B CN110319801B CN201910626612.4A CN201910626612A CN110319801B CN 110319801 B CN110319801 B CN 110319801B CN 201910626612 A CN201910626612 A CN 201910626612A CN 110319801 B CN110319801 B CN 110319801B
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- positioning block
- base
- tenon
- coordinate measuring
- blade
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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
-
- 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
Abstract
The invention discloses a three-coordinate measuring clamp for a tenon blade with an arc bottom surface, and belongs to the technical field of blade measurement. A circular arc bottom surface tenon blade three-coordinate measuring clamp comprises: the device comprises a base, a first positioning block, a second positioning block and a push rod assembly; an eccentric shaft which is rotatably connected with the base is arranged in the base and comprises an eccentric cylinder; the first positioning block and the second positioning block are arranged at the top of the base, and are arranged at intervals and oppositely; positioning grooves with the same angle with the pressure surface of the tenon are respectively arranged at the tops of the first positioning block and the second positioning block, and sliding holes are formed in the bottoms of the positioning grooves; the ejector pin subassembly includes the bracing piece, and the bracing piece is equipped with rectangular hole, and rectangular hole and eccentric cylinder mutually support, and the top of bracing piece is equipped with first knock pin and second knock pin, first knock pin and second knock pin respectively with slide opening sliding fit. The invention adopts the pressure surface of the tenon as the reference for fixing, thereby improving the positioning precision and further improving the detection precision.
Description
Technical Field
The invention relates to the technical field of blade measurement, in particular to a three-coordinate measuring clamp for a circular arc bottom surface tenon blade.
Background
The blade is a part with complex shape, numerous sizes and strict tolerance requirements, and the three-coordinate measuring machine is widely applied to blade measurement by virtue of the advantages of strong universality, good repeatability, strong stability, high detection precision and the like, and is an important means for ensuring the quality of the blade at present; when three-coordinate measurement is carried out, the blade is fixed on the working table top by means of an auxiliary clamp and is kept at a correct position, and if the positioning precision of the auxiliary clamp is poor, the accuracy of a measurement result is influenced; the bottom surface of the circular arc bottom surface tenon blade is in a semicircular arc shape, and three-coordinate measurement of the circular arc bottom surface tenon blade is always difficult, and the circular arc bottom surface tenon blade is specifically represented as follows:
1. the bottom surface of the tenon is a circular arc, so that the locating detection is difficult compared with that of a common flat-bottomed tenon, a universal rectangular magnetic suction disc on the bottom surface of the locating tenon is not suitable, and a special three-coordinate measuring clamp needs to be designed;
2. the blade needs to be measured for many times in the tenon and molded surface processing process and finished products, and the repeated positioning precision of the three-coordinate measuring clamp is high.
Regarding the three-coordinate measurement of the tenon blade with the circular bottom surface, the circular bottom surface of the tenon is taken as a positioning reference, a V-shaped block is taken as a positioning element at present, and a magnetic device is used for assisting in tightly sucking the tenon; the bottom surface circular arc profile tolerance is big, and there is machining error size shape, and V type piece centering nature is poor this moment, and the key pile up axis position of blade is unanimous when can't guaranteeing repeated clamping, and positioning error leads to blade detection accuracy not enough or the testing result distortion.
Disclosure of Invention
The invention aims to provide a three-coordinate measuring clamp for a circular arc bottom surface tenon blade, which aims to solve the problems of insufficient detection accuracy or distorted detection results of the existing circular arc bottom surface tenon blade during measurement.
The technical scheme for solving the technical problems is as follows:
a circular arc bottom surface tenon blade three-coordinate measuring clamp comprises: the device comprises a base, a first positioning block, a second positioning block and a push rod assembly;
an eccentric shaft which is rotatably connected with the base is arranged in the base and comprises an eccentric cylinder;
the first positioning block and the second positioning block are arranged at the top of the base, and are arranged at intervals and oppositely; the tops of the first positioning block and the second positioning block are respectively provided with a positioning groove matched with the tenon of the blade, and the bottom of the positioning groove is provided with a sliding hole;
the ejector pin subassembly includes the bracing piece, and the bracing piece is equipped with rectangular hole, and rectangular hole and eccentric cylinder mutually support, and the top of bracing piece is equipped with first knock pin and second knock pin, first knock pin and second knock pin respectively with slide opening sliding fit.
The tenon with the arc bottom surface of the blade can be placed in the positioning groove to be fixed, the arc bottom surface of the tenon is in contact with the ejector rod assembly, the pressure surface of the tenon can be tightly attached to the side wall of the positioning groove by jacking the ejector rod assembly, so that the tenon is fixed by taking the pressure surface as a reference, the ejector rod assembly is in point-surface contact with the arc bottom surface of the tenon and is extruded and fixed, the arc bottom surface is prevented from being used for positioning, the positioning precision is improved, the detection precision is improved, and the problem of detection result distortion is avoided.
In addition, the first positioning block and the second positioning block are arranged at intervals and oppositely, the middle and two ends of the tenon are not shielded, the shielding position of the tenon is small, and the three-coordinate measuring needle is convenient to acquire points and measure.
The first positioning block and the second positioning block are used for limiting the tenon, and the blade sequentially penetrates through the positioning grooves in the first positioning block and the second positioning block to be limited. The rotation axis of the eccentric shaft and the axis of the eccentric cylinder have a certain offset, and when the eccentric shaft rotates, the eccentric cylinder is equivalent to a cam to move. When the eccentric cylinder was arranged in the rectangular hole on the bracing piece, eccentric cylindrical's motion can drive the bracing piece and be reciprocating motion in vertical direction to make first knock pin and second knock pin slide in the slide opening respectively, during first knock pin and second knock pin upward movement, can extrude the circular arc bottom surface of tenon, make the pressure surface of tenon closely laminate with the lateral wall of constant head tank, realize the fixed of blade, during first knock pin and the second knock pin downward movement, can loosen the blade.
Furthermore, the eccentric shaft further comprises a first journal and a second journal, the axes of the first journal and the second journal coincide with each other, the first journal, the eccentric cylinder and the second journal are sequentially connected end to end, and the first journal and the second journal are respectively and rotatably connected with the base.
The first journal and the second journal are respectively connected with the base to play a supporting role and form rotary connection with the base, so that the eccentric shaft can rotate in the base.
Furthermore, the first journal and the second journal are respectively provided with a first screw and a second screw; the first screw and the second screw are respectively provided with a knurled nut and a limiting nut.
The knurled nut and the limiting nut are connected with the first screw and the second screw respectively, and then play a role in limiting the eccentric shaft, so that the eccentric shaft is prevented from sliding out of the base, and the eccentric cylinder and the strip hole can be prevented from being separated.
Furthermore, the number of the limiting nuts is 2, and the 2 limiting nuts are in mutual contact.
2 limit nut that set up on the second screw rod can form the auto-lock, and 2 nuts are screwed up the back each other, can form the auto-lock through the meshing of thread, and limit nut self can not slide on the second screw rod, still can not lock the eccentric shaft.
Furthermore, the supporting rod comprises a top rod and a U-shaped supporting rod; the long hole is arranged on the ejector rod, and the top of the ejector rod is provided with an installation groove; the supporting rod comprises two longitudinal rods arranged at intervals; the bottom ends of the two longitudinal rods are connected through a cross rod, and the cross rod is arranged in the mounting groove and connected with the supporting rod; the top ends of the two longitudinal rods are respectively provided with a first ejector pin and a second ejector pin.
Furthermore, the bottoms of the first positioning block and the second positioning block are respectively provided with a placing groove, and the two vertical rods are respectively placed in the placing grooves.
The positioning blocks are provided with the mounting grooves, so that the positioning blocks cannot interfere with the reciprocating motion of the longitudinal rod in the vertical direction.
Furthermore, the top of the base is provided with a mounting hole, and the ejector rod is in sliding fit with the mounting hole.
Further, the axis of the mounting hole is perpendicular to and intersects with the rotation axis of the eccentric shaft.
The mounting hole of the invention is used for limiting the degree of freedom of the ejector rod, so that the ejector rod can reciprocate in the mounting hole. The axis of the mounting hole is perpendicular to and intersected with the rotation axis of the eccentric shaft, so that the eccentric shaft and the ejector rod assembly can move in the base after being connected.
Furthermore, the section of the positioning groove is in an inverted trapezoid shape.
When the section of the positioning groove is in an inverted trapezoid shape, two bevel edges of the positioning groove are planes and are used for being matched with the stress surface of the tenon to realize plane positioning.
Furthermore, the base is made of ferromagnetic material.
Because the detection of the blade is generally fixed through a magnetic chuck, the clamp can be effectively fixed through the base made of ferromagnetic materials.
The invention has the following beneficial effects:
(1) the tenon with the arc bottom surface of the blade can be placed in the positioning groove to be fixed, the arc bottom surface of the tenon is in contact with the ejector rod assembly, the pressure surface of the tenon can be tightly attached to the side wall of the positioning groove by jacking the ejector rod assembly, so that the tenon is fixed by taking the pressure surface as a reference, the ejector rod assembly is in point-surface contact with the arc bottom surface of the tenon and is extruded and fixed, the arc bottom surface is prevented from being used for positioning, the positioning precision is improved, the detection precision is improved, and the problem of detection result distortion is avoided.
(2) The first positioning block and the second positioning block in the three-coordinate measuring fixture for the tenon blade with the arc bottom surface are arranged at intervals and oppositely, the middle and two ends of the tenon are not shielded, the shielding position of the tenon is small, and the three-coordinate measuring probe is convenient to adopt point measurement.
Drawings
FIGS. 1 and 2 are schematic structural views of a three-dimensional measuring fixture for a tenon blade with a circular bottom surface according to the invention;
FIG. 3 is a schematic structural diagram of a base according to the present invention;
FIG. 4 is a schematic view of the eccentric shaft of the present invention;
FIG. 5 is a schematic structural diagram of a second positioning block according to the present invention;
FIG. 6 is a schematic structural view of the ram assembly of the present invention;
FIG. 7 is a schematic measurement diagram of the three-coordinate measuring fixture for the tenon blade with the circular arc bottom surface.
In the figure: 10-a base; 11-mounting holes; 20-a first positioning block; 30-a second positioning block; 31-a positioning groove; 32-a slide hole; 33-a placement groove; 40-a mandrel assembly; 41-a support bar; 42-a first knock pin; 43-a second knock pin; 44-a mandril; 45-strut; 46-a mounting groove; 47-a longitudinal bar; 48-a cross-bar; 49-elongated holes; 50-an eccentric shaft; 51-eccentric cylinder; 52-first journal; 53-second journal; 54-a first screw; 55-a second screw; 56-knurled nut; 57-a limit nut; 60-blades; 61-tenon.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Examples
Referring to fig. 1 and 2, a three-coordinate measuring fixture for a tenon blade with a circular arc bottom surface comprises: the positioning device comprises a base 10, a first positioning block 20, a second positioning block 30 and a push rod assembly 40. The eccentric shaft 50 is arranged in the base 10, two ends of the eccentric shaft 50 extend out of the side wall of the base 10, two ends of the eccentric shaft 50 are respectively provided with a knurled nut 56 and a limiting nut 57, the knurled nut 56 and the limiting nut 57 limit the eccentric shaft 50 in the base 10, and the eccentric shaft 50 is prevented from falling off. The first positioning block 20 and the second positioning block 30 have the same structure, and the first positioning block 20 and the second positioning block 30 are opposite in plate surface and are arranged on the top of the base 10 at intervals and in parallel. The ram assembly 40 extends from the top of the base 10 into the interior of the base 10 and is connected to the eccentric shaft 50.
Referring to fig. 3, a through hole for installing the eccentric shaft 50 is formed in the base 10, and the through hole penetrates through two corresponding sides of the base 10. The top of the base 10 is provided with a mounting hole 11 for mounting the ram assembly 40. In the present embodiment, the base 10 has ferromagnetism, and can be connected to a magnetic chuck for fixation.
Referring to fig. 4, the eccentric shaft 50 includes a first screw 54, a first journal 52, an eccentric cylinder 51, a second journal 53 and a second screw 55 connected in sequence. The axes of the first screw 54, the first journal 52, the second journal 53, and the second screw 55 coincide, and this axis is the axis of revolution of the eccentric shaft 50. The axis of the eccentric cylinder 51 is parallel to the axis of revolution, and the eccentricity of the eccentric cylinder 51, i.e., the distance between the axis of the eccentric cylinder 51 and the axis of revolution, is 1.5 to 3 mm. The first journal 52 and the second journal 53 are respectively rotatably connected to the base 10, and can support the eccentric shaft 50. The first screw 54 is provided with a knurled nut 56 for rotating the eccentric shaft 50. Two limiting nuts 57 are arranged on the second screw 55, and the two limiting nuts 57 are in close contact with each other to realize self-locking.
Referring to fig. 5, the first positioning block 20 and the second positioning block 30 have the same structure, and in this embodiment, only the second positioning block 30 will be described. The second positioning block 30 is vertically arranged, and a mounting plate is arranged at the bottom of the second positioning block and is fixedly connected with the top of the base 10 through screws and pins. After the first positioning block 20 and the second positioning block 30 are connected to the base 10, the first positioning block 20 and the second positioning block 30 are opposite in surface and are arranged in parallel at intervals. The bottom of the second positioning block 30 is also provided with a placing groove 33. The top of the second positioning block 30 is provided with a positioning groove 31, the cross section of the positioning groove 31 is inverted trapezoid, and two inclined edges of the trapezoid are matched with the stress surface of the tenon 61 of the blade 60. The bottom of the positioning slot 31 is provided with a sliding hole 32, and the sliding hole 32 penetrates through the placing slot 33 and the positioning slot 31. In the present embodiment, the positioning grooves 31 and the positioning grooves 33 on the first positioning block 20 and the second positioning block 30 correspond to each other.
Referring to fig. 6, the lift pin assembly 40 includes a support rod 41, a first lift pin 42 and a second lift pin 43. The support rod 41 includes a top bar 44 and a support rod 45. The carrier rod 44 is vertically arranged and provided with a long hole 49 in the middle, and the long hole 49 is transversely arranged. The lower end of the push rod 44 extends from the mounting hole 11 into the inside of the base 10, and the eccentric cylinder 51 is disposed in the elongated hole 49, and the eccentric shaft 50, when rotated, makes the push rod 44 reciprocate in the vertical direction. The top end of the top rod 44 is provided with a mounting groove 46.
The strut 45 is U-shaped, and includes two longitudinal rods 47, and the two longitudinal rods 47 are respectively disposed in the disposition groove 33, so that the longitudinal rods 47 can reciprocate in the vertical direction. The bottom ends of the two vertical rods 47 are connected through a cross rod 48 to form a U shape. The cross bar 48 is placed in the mounting groove 46 and connected by a pin. The first top pin 42 and the second top pin 43 are both vertically arranged, and the bottom ends are respectively connected with the top ends of the two longitudinal rods 47. The first knock pin 42 and the second knock pin 43 respectively extend into the slide holes 32 of the two positioning blocks, so that the first knock pin 42 and the second knock pin 43 can slide in the slide holes 32 in a reciprocating manner in the vertical direction.
Referring to fig. 7, when the circular arc bottom tenon blade three-dimensional measurement fixture is used to clamp and fix the blade 60, the base 10 is first fixed on the magnetic chuck; then, the tenon 61 of the blade 60 sequentially passes through the positioning grooves 31 of the first positioning block 20 and the second positioning block 30, and the stress surface of the tenon 61 is opposite to the two side surfaces of the positioning groove 31; and then the knurled nut 56 is rotated, the eccentric cylinder 51 rotates along with the cam, so that the push rod assembly 40 moves upwards, the first ejector pin 42 and the second ejector pin 43 of the push rod assembly 40 are contacted with the arc bottom surface of the tenon 61 and tightly push the tenon 61, the stress surface of the tenon 61 is tightly contacted with the two side surfaces of the positioning groove 31, and the blade 60 is fixed. When the blade 60 is removed, the knurled nut 56 is rotated in the opposite direction and the eccentric cylinder 51 drives the ram assembly 40 in a downward linear motion, thereby releasing the tenon 61 and allowing the blade 60 to be removed from the jig.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a circular arc bottom surface tenon blade three-coordinate measuring anchor clamps which characterized in that includes: the device comprises a base (10), a first positioning block (20), a second positioning block (30) and a push rod assembly (40);
an eccentric shaft (50) rotatably connected with the base is arranged in the base (10), and the eccentric shaft (50) comprises an eccentric cylinder (51);
the first positioning block (20) and the second positioning block (30) are arranged at the top of the base (10), and the first positioning block (20) and the second positioning block (30) are arranged at intervals and oppositely; positioning grooves (31) matched with tenons of the blades are respectively formed in the tops of the first positioning block (20) and the second positioning block (30), and sliding holes (32) are formed in the bottoms of the positioning grooves (31);
ejector pin subassembly (40) includes bracing piece (41), bracing piece (41) are equipped with rectangular hole (49), rectangular hole (49) with eccentric cylinder (51) mutually supports, the top of bracing piece (41) is equipped with first knock pin (42) and second knock pin (43), first knock pin (42) and second knock pin (43) respectively with slide opening (32) sliding fit.
2. The circular arc base tenon blade three-coordinate measuring jig according to claim 1, wherein the eccentric shaft (50) further comprises a first journal (52) and a second journal (53) whose axes coincide, the first journal (52), the eccentric cylinder (51) and the second journal (53) are sequentially connected end to end, and the first journal (52) and the second journal (53) are respectively rotatably connected to the base (10).
3. The circular-arc-base tenon blade three-coordinate measuring jig according to claim 2, wherein the first journal (52) and the second journal (53) are provided with a first screw (54) and a second screw (55), respectively; the first screw rod (54) and the second screw rod (55) are respectively provided with a knurled nut (56) and a limiting nut (57).
4. The three-coordinate measuring fixture of a tenon blade with a circular bottom surface as claimed in claim 3, wherein the number of the limit nuts (57) is 2, and 2 limit nuts (57) are in contact with each other.
5. The circular arc bottom surface tenon blade three-coordinate measuring jig according to claim 1, wherein the support rod (41) comprises a top bar (44) and a support rod (45) in a U shape; the long hole (49) is arranged on the top rod (44), and the top of the top rod (44) is provided with a mounting groove (46); the supporting rod (45) comprises two longitudinal rods (47) arranged at intervals; the bottom ends of the two longitudinal rods (47) are connected through a cross rod (48), and the cross rod (48) is placed in the mounting groove (46) and connected with the supporting rod (41); the top ends of the two vertical rods (47) are respectively provided with a first ejector pin (42) and a second ejector pin (43).
6. The three-coordinate measuring fixture for the tenon blade with the circular arc bottom surface according to claim 5, wherein the bottom parts of the first positioning block (20) and the second positioning block (30) are respectively provided with a placement groove (33), and two longitudinal rods (47) are respectively placed in the placement grooves (33).
7. The three-coordinate measuring fixture of the tenon blade with the circular arc bottom surface as claimed in claim 6, wherein the top of the base (10) is provided with a mounting hole (11), and the ejector rod (44) is in sliding fit with the mounting hole (11).
8. The circular arc-bottomed tenon blade three-coordinate measuring jig according to claim 7, wherein the axis of the mounting hole (11) is perpendicular to and intersects with the axis of revolution of the eccentric shaft (50).
9. The tongued blade three coordinate measurement fixture of any one of claims 1 to 8, wherein the cross-sectional profile of the positioning slot (31) is wedge-shaped.
10. The three-coordinate measuring fixture of the tenon blade with the circular arc bottom surface of claim 9, wherein the base (10) is made of a ferromagnetic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910626612.4A CN110319801B (en) | 2019-07-11 | 2019-07-11 | Three-coordinate measuring clamp for circular arc bottom surface tenon blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910626612.4A CN110319801B (en) | 2019-07-11 | 2019-07-11 | Three-coordinate measuring clamp for circular arc bottom surface tenon blade |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110319801A CN110319801A (en) | 2019-10-11 |
| CN110319801B true CN110319801B (en) | 2021-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910626612.4A Active CN110319801B (en) | 2019-07-11 | 2019-07-11 | Three-coordinate measuring clamp for circular arc bottom surface tenon blade |
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| Country | Link |
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| CN (1) | CN110319801B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112440199A (en) * | 2020-12-09 | 2021-03-05 | 长春理工大学 | Device for precisely machining blade by abrasive flow |
| CN114894144B (en) * | 2022-04-25 | 2023-11-14 | 中国航发航空科技股份有限公司 | Method for detecting fine fir tree-shaped tenon teeth of turbine blade |
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| CN106112582A (en) * | 2016-06-28 | 2016-11-16 | 中国南方航空工业(集团)有限公司 | The clamping device of blade |
| CN206241701U (en) * | 2016-12-09 | 2017-06-13 | 无锡航亚科技股份有限公司 | A kind of blade tenon linear cutter fixture |
| CN107009171A (en) * | 2017-05-31 | 2017-08-04 | 衢州学院 | A kind of workpiece processing frock |
| CN207171532U (en) * | 2017-07-17 | 2018-04-03 | 无锡东雄金鹰科技有限公司 | Fork-shaped tenon fluting fixture |
| CN109186518A (en) * | 2018-09-05 | 2019-01-11 | 中国航发动力股份有限公司 | A kind of swallow-tail form tenon rotor blade detection fixture and detection method |
| CN208614623U (en) * | 2018-08-02 | 2019-03-19 | 成都工贸职业技术学院 | High-pressure compressor blade dovetail tenon clamping fixture |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010000579B4 (en) * | 2010-02-26 | 2013-10-31 | Samson Ag | Workpiece holder for holding a workpiece to be machined in a machine tool |
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2019
- 2019-07-11 CN CN201910626612.4A patent/CN110319801B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106112582A (en) * | 2016-06-28 | 2016-11-16 | 中国南方航空工业(集团)有限公司 | The clamping device of blade |
| CN206241701U (en) * | 2016-12-09 | 2017-06-13 | 无锡航亚科技股份有限公司 | A kind of blade tenon linear cutter fixture |
| CN107009171A (en) * | 2017-05-31 | 2017-08-04 | 衢州学院 | A kind of workpiece processing frock |
| CN207171532U (en) * | 2017-07-17 | 2018-04-03 | 无锡东雄金鹰科技有限公司 | Fork-shaped tenon fluting fixture |
| CN208614623U (en) * | 2018-08-02 | 2019-03-19 | 成都工贸职业技术学院 | High-pressure compressor blade dovetail tenon clamping fixture |
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| CN110319801A (en) | 2019-10-11 |
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