CN113442077B - Special fixture for drilling experiment of laminated composite material - Google Patents
Special fixture for drilling experiment of laminated composite material Download PDFInfo
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- CN113442077B CN113442077B CN202110728865.XA CN202110728865A CN113442077B CN 113442077 B CN113442077 B CN 113442077B CN 202110728865 A CN202110728865 A CN 202110728865A CN 113442077 B CN113442077 B CN 113442077B
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- positioning
- clamping
- sliding block
- base
- thickness adjusting
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- 239000002131 composite material Substances 0.000 title claims abstract description 29
- 238000005553 drilling Methods 0.000 title claims abstract description 26
- 238000002474 experimental method Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000003825 pressing Methods 0.000 claims abstract description 10
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 5
- 238000005381 potential energy Methods 0.000 claims description 3
- 238000003475 lamination Methods 0.000 claims description 2
- 230000003068 static effect Effects 0.000 abstract description 2
- 238000003754 machining Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011208 reinforced composite material Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Classifications
-
- 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
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Jigs For Machine Tools (AREA)
- Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
Abstract
The invention discloses a special fixture for drilling experiments of laminated composite materials, which comprises a base, a clamping device, a thickness adjusting device and a positioning device, wherein the clamping device, the thickness adjusting device and the positioning device are arranged on the base, a first adjusting screw rod is driven by a rotating hand wheel to move a left sliding block to be in a proper position, a connecting plate is pressed, a positioning cylinder pressing spring is retracted into a hole groove of a positioning block by pressure, the positioning block is pushed to drive a right sliding block to be in a proper position, the connecting plate is loosened, the positioning cylinder is clamped in a cylindrical groove on the inner wall of the base, a second adjusting screw rod is twisted to finely adjust the right sliding block, a scale mark on the base is contrasted, a sample is ensured to be in a central position, a gasket and a gasket are screwed by a positioning bolt, the thickness adjusting plate is fixed by static friction force, a loading bolt pressing backing plate is screwed, clamping of the sample is realized, the clamping device and the positioning device are adjusted, the clamping fixture is suitable for clamping and fixing laminated composite members with different lengths and thicknesses, influences on workpieces due to unstable clamping in the processing process are reduced, workpiece clamping stability can be increased, and damage caused by overlarge clamping force can be effectively prevented.
Description
Technical Field
The invention relates to the field of machining clamps, in particular to a special clamp for drilling experiments of laminated composite materials.
Background
The laminated composite material has the advantages of high specific strength and specific modulus, good fatigue resistance and wear resistance and the like, and is widely applied to the fields of aviation, aerospace, medical treatment, civil engineering, automobile manufacturing and the like. Laminated composite materials often need to be joined or assembled with other parts when in use, and therefore inevitably require some hole machining. The laminated composite material is formed by bonding single-layer composite materials according to certain layering angles and sequences, has anisotropy in mechanical property and low interlayer connection strength, and often has processing defects such as layering, tearing, burrs and the like in the hole processing process. The machining defects not only influence the shape and position precision of holes and further influence the installation and positioning precision among parts, but also can be used as a crack source to easily cause cracking of materials in use, so that the service life of related products is obviously reduced. Therefore, before practical application, a certain amount of drilling process experiments are needed to be carried out on the laminated composite material, and the law of influence of process parameter changes on the processing quality of holes of the laminated composite material is explored, so that the optimal process parameter combination is sought to guide practical production.
Laminated composite materials, such as glass fiber reinforced composite materials, carbon fiber reinforced composite materials and the like, are composed of high-performance reinforced fibers and resin, have distinct lamination characteristics and anisotropic mechanical properties, and therefore, have higher requirements on clamping and positioning of drilling process experiments. In the process of tightening and fixing a traditional universal fixture, a certain clamping force load is applied to a workpiece, the clamping force is not regulated and controlled generally, and as the interlayer shearing strength of the laminated composite materials is relatively low, the excessive clamping force of the fixture can cause the materials to be bent and deformed to a certain extent or damaged, so that the drilling experiment generates larger layering and tearing damage, and the experimental result is seriously influenced. In addition, when the universal fixture is used for fixing laminated composite materials with different shapes, the drilling position is inevitably deviated from the center of the force measuring device, so that extra torque is generated in the drilling experiment process to influence the experiment result, and therefore, a special fixture for the laminated composite material drilling experiment is urgently needed to solve the problems.
Disclosure of Invention
The invention provides a special fixture for drilling experiments of laminated composite materials, which can adapt to clamping and fixing of laminated composite materials with different lengths and thicknesses by adjusting a sliding block and a loading bolt; the positioning device can realize accurate clamping and positioning of the laminated composite material; by means of a torque wrench, balanced and stable pre-pressing load can be applied to the laminated composite material through the thickness adjusting device and the positioning device, and the influence on a workpiece caused by unstable clamping of the clamp in the drilling process is reduced; compared with the traditional universal clamp, the clamp is comprehensive in function and convenient to operate, and can increase the clamping and fixing stability of a workpiece in drilling experiments.
In order to achieve the above purpose, the present invention provides the following technical solutions: the special fixture for the drilling experiment of the laminated composite material comprises a base, a clamping device, a thickness adjusting device and a positioning device, wherein the clamping device, the thickness adjusting device and the positioning device are arranged on the base;
The clamping device comprises a left sliding block and a right sliding block which are movably connected to a sliding rail, wherein the two sliding blocks are respectively provided with a supporting base plate through a first inner hexagon screw, U-shaped grooves for the first adjusting screw rod and the second adjusting screw rod to penetrate are respectively formed in the left sliding block and the right sliding block, the threaded holes penetrate through the first adjusting screw rod, one end of the first adjusting screw rod is connected to the U-shaped grooves of the left sliding block, and the other end of the first adjusting screw rod is provided with a hand wheel.
Thickness adjusting device, including two thickness adjusting plates that are U type structure, the screw thread through-hole that supplies a plurality of loading bolts to wear to establish is seted up to its blind end, and open end swing joint respectively in the both sides of left slider and right slider, two support the backing plate and keep swing joint through the sample, placed the backing plate on the sample, the backing plate closely laminates in loading bolt lower extreme.
The positioning device comprises positioning blocks, wherein first hole grooves for movably mounting a spring and positioning cylinders are formed in two side walls of the positioning blocks, second hole grooves for movably mounting positioning clamping gaskets are formed in two positioning cylinders, one ends of the two positioning clamping gaskets are in interference fit with the positioning blocks through positioning pins, and the other ends of the two positioning clamping gaskets are in movable connection through connecting plates.
Preferably, the inclined plane has been seted up to the junction of location chucking gasket and positioning cylinder, the connecting plate receives to press, drives two location chucking gasket displacements, and the inclined plane of two location chucking gaskets compresses tightly positioning cylinder, makes two positioning cylinder do relative displacement motion in the locating piece is inside, positioner can freely remove in the slide rail of base, loosens the connecting plate, and spring elastic potential energy converts kinetic energy, promotes positioning cylinder and stretches out from the locating piece, and then keeps chucking state with base slide rail inner wall, adjusts second accommodate the lead screw drive right slider position, accomplishes the location operation to the sample.
Preferably, the third hole groove is formed in the bottom of the positioning block, one half of the positioning pin is embedded and installed in the positioning clamping gasket, and the other half of the positioning pin is clamped and installed in the third hole groove, so that the positioning clamping gasket is prevented from falling off in the clamping displacement process.
Preferably, the loading bolt is screwed up through the torque wrench to compress tightly the backing plate, and then exert certain precompression load to the sample, the second accommodate screw is screwed up through the torque wrench to drive right slider displacement, and then exert certain pretension load to the sample, the sample receives vertical and horizontal load and is fixed.
Preferably, both sides of the left sliding block and the right sliding block are respectively provided with a sliding groove for the sliding connection of the opening end of the thickness adjusting plate, and the two sliding blocks are respectively in threaded connection with the thickness adjusting plate through a positioning bolt, a gasket and a gasket.
Preferably, the base is placed on the dynamometer through a base plate and a connecting plate, is fixed on a machine tool workbench by means of a fixing bolt and a pressing plate tool, and data are acquired by the dynamometer and then input into a computer in the experimental process.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the clamping device and the positioning device can be adjusted to adapt to clamping and fixing of laminated composite members with different lengths and thicknesses, the influence on a workpiece caused by unstable clamping in the machining process is reduced, the clamping and fixing stability of the workpiece can be increased, damage to materials caused by overlarge clamping force is effectively prevented, the clamping and fixing and accurate positioning of laminated composite materials are realized through the adjusting slide block and the loading bolt and the positioning device, the accuracy of drilling experiment acquisition data is ensured, and a certain pre-pressing load can be applied to the laminated composite materials through the loading bolt and the adjusting screw rod, so that the clamping and fixing of the materials in the drilling process are ensured to be stable and reliable.
2. The invention can apply balanced and stable pre-pressing load to the laminated composite material by means of the torque wrench through the thickness adjusting device and the positioning device, thereby reducing the influence on a workpiece caused by unstable clamping in the drilling process; compared with the traditional universal clamp, the clamp is comprehensive in function and convenient to operate, and can increase the clamping and fixing stability of a workpiece in drilling experiments.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.
In the drawings:
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic view of the structure of the slider and thickness adjustment device of the present invention;
FIG. 3 is a schematic view of an exploded construction of the positioning device of the present invention;
FIG. 4 is a schematic cross-sectional view of a positioning device of the present invention;
FIG. 5 is a schematic view of a slider structure according to the present invention;
FIG. 6 is a schematic view of the positioning block structure of the present invention;
Reference numerals in the drawings:
1. A hand wheel; 2. a first adjusting screw rod; 3. a base; 4. a thickness adjusting plate; 5. loading a bolt; 6. a backing plate; 7. a sample; 8. a right slider; 9. a positioning block; 10. a second adjusting screw rod; 11. positioning bolts; 12. a gasket; 13. a gasket; 14. a first socket head cap screw; 15. a support backing plate; 16. a left slider; 17. a pin; 18. positioning and clamping the gasket; 19. a connecting plate; 20. a second socket head cap screw; 21. a spring; 22. and (5) positioning the cylinder.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
Examples: as shown in fig. 1-6, a special fixture for drilling experiments of laminated composite materials comprises a base 3, a clamping device, a thickness adjusting device and a positioning device which are positioned on the base 3, wherein a sliding rail and a threaded hole are axially formed in the base 3;
The clamping device comprises a left sliding block 16 and a right sliding block 8 which are movably connected to a sliding rail, a supporting base plate 15 is mounted on each sliding block through a first inner hexagon screw 14, U-shaped grooves for the first adjusting screw rod 2 and the second adjusting screw rod 10 to penetrate are formed in each of the left sliding block 16 and the right sliding block 8, a threaded hole penetrates through the first adjusting screw rod 2, one end of the first adjusting screw rod 2 is connected to the U-shaped groove of the left sliding block 16, and a hand wheel 1 is mounted on the other end of the first adjusting screw rod 2.
Thickness adjusting device, including two thickness adjusting plate 4 that are U type structure, the threaded through-hole that supplies a plurality of loading bolt 5 to wear to establish is seted up to its blind end, and open end swing joint is in the both sides of left slider 16 and right slider 8 respectively, and two support backing plates 15 keep swing joint through sample 7, have placed backing plate 6 on the sample 7, and backing plate 6 closely laminates in loading bolt 5 lower extreme.
The positioning device comprises a positioning block 9, wherein both side walls of the positioning block 9 are provided with first hole grooves for movably mounting a spring 21 and a positioning cylinder 22, both positioning cylinders 22 are provided with second hole grooves for movably mounting positioning clamping gaskets 18, one ends of the two positioning clamping gaskets 18 are in interference fit with the positioning block 9 through positioning pins 17, and the other ends of the two positioning clamping gaskets are in movable connection through a connecting plate 19;
The joint of the positioning clamping gaskets 18 and the positioning cylinder 22 is provided with an inclined surface, the connecting plate 19 is pressed to drive the two positioning clamping gaskets 18 to displace, the inclined surfaces of the two positioning clamping gaskets 18 press the positioning cylinder 22, so that the two positioning cylinders 22 do relative displacement motion in the positioning block 9, the positioning device can freely move in the sliding rail of the base 3, the connecting plate 19 is loosened, the elastic potential energy of the spring 21 is converted into kinetic energy to push the positioning cylinder 22 to extend out of the positioning block 9, the clamping state is kept with the inner wall of the sliding rail of the base 3, and the second adjusting screw 10 is adjusted to drive the position of the right sliding block 8, so that the positioning operation of the sample 7 is completed;
When drilling experiments are carried out, a user rotates the hand wheel 1 to drive the first adjusting screw rod 2 to move the left sliding block 16 to be in a proper position according to the shape and the size of the sample piece 7, presses the connecting plate 19, enables the positioning cylinder 22 to compress the hole groove of the spring 21 to retract the positioning block 9 through pressure, pushes the positioning block 9 to drive the right sliding block 8 to be in a proper position, loosens the connecting plate 21, enables the positioning cylinder 24 to be clamped in the cylindrical groove on the inner wall of the base 3, twists the second adjusting screw rod 10 to finely adjust the right sliding block 8, controls the scale mark on the base 3, ensures that the sample piece 7 is in a central position, tightens the gasket 12 and the gasket 11 through the positioning bolt 11, enables the adjusting thickness adjusting plate 4 to be fixed through static friction, tightens the carrying bolt 5 to compress the base plate 6, and realizes clamping of the sample piece 7.
A torque wrench is used for twisting a loading bolt 5 on the thickness adjusting plate 4, the loading bolt 5 is used for pressing a backing plate 6, and a certain pre-pressure load is applied to a sample 7; a torque wrench is used for twisting the second adjusting screw rod 10 to finely adjust the position of the right sliding block 8, and a certain pretension load is applied to the sample 7; before the drilling experiment starts, balanced and stable pulling and pressing load is applied through a torque wrench, stable clamping of laminated composite materials in the drilling experiment process is guaranteed, in addition, the base 3 is placed on the dynamometer through the base plate 6 and the connecting plate 19, the base is fixed on a machine tool workbench by means of a fixing bolt and a pressing plate tool, and data in the experiment process are acquired through the dynamometer and then are input into a computer.
Finally, it should be noted that: the foregoing is merely a preferred example of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A special fixture of lamination combined material drilling experiment, its characterized in that: the device comprises a base (3), a clamping device, a thickness adjusting device and a positioning device, wherein the clamping device, the thickness adjusting device and the positioning device are arranged on the base (3), and the base (3) is axially provided with a sliding rail and a threaded hole;
The clamping device comprises a left sliding block (16) and a right sliding block (8) which are movably connected to a sliding rail, wherein a supporting base plate (15) is arranged on each sliding block through a first inner hexagon screw (14), U-shaped grooves for the first adjusting screw rod (2) and the second adjusting screw rod (10) to penetrate are respectively formed in each sliding block (16) and the right sliding block (8), a first adjusting screw rod (2) penetrates through each threaded hole, one end of each first adjusting screw rod (2) is connected to the U-shaped groove of each sliding block (16), and a hand wheel (1) is arranged at the other end of each first adjusting screw rod;
The thickness adjusting device comprises two thickness adjusting plates (4) with U-shaped structures, threaded through holes for a plurality of loading bolts (5) to penetrate are formed in the closed ends of the thickness adjusting plates, the open ends of the thickness adjusting plates are respectively and movably connected to the two sides of a left sliding block (16) and the right sliding block (8), two supporting base plates (15) are movably connected through a sample piece (7), base plates (6) are placed on the sample piece (7), and the base plates (6) are tightly attached to the lower ends of the loading bolts (5);
the positioning device comprises positioning blocks (9), wherein first hole grooves for movably mounting a spring (21) and positioning cylinders (22) are formed in two side walls of the positioning blocks, second hole grooves for movably mounting positioning clamping gaskets (18) are formed in the two positioning cylinders (22), one ends of the two positioning clamping gaskets (18) are in interference fit with the positioning blocks (9) through positioning pins (17), and the other ends of the two positioning clamping gaskets are in movable connection through connecting plates (19);
The joint of the positioning clamping gaskets (18) and the positioning cylinders (22) is provided with inclined surfaces, the connecting plate (19) is pressed to drive the two positioning clamping gaskets (18) to displace, the inclined surfaces of the two positioning clamping gaskets (18) press the positioning cylinders (22) to enable the two positioning cylinders (22) to do relative displacement movement in the positioning blocks (9), the positioning device can freely move in the sliding rail of the base (3), the connecting plate (19) is loosened, elastic potential energy of the spring (21) is converted into kinetic energy to push the positioning cylinders (22) to extend out of the positioning blocks (9) and further keep a clamping state with the inner wall of the sliding rail of the base (3), and the second adjusting screw (10) is adjusted to drive the right sliding block (8) to finish positioning operation of the sample (7);
a third hole groove is formed in the bottom of the positioning block (9), one half of the positioning pin (17) is embedded and installed in the positioning clamping gasket (18), and the other half of the positioning pin is clamped and installed in the third hole groove, so that the positioning clamping gasket (18) is prevented from falling off in the clamping displacement process.
2. The special fixture for drilling experiments of laminated composite materials according to claim 1, wherein: the loading bolt (5) is screwed up through the torque wrench to compress tightly backing plate (6), and then exert certain precompression load to sample piece (7), second accommodate lead screw (10) are screwed up through the torque wrench in order to drive right slider (8) displacement, and then exert certain pretension load to sample piece (7), sample piece (7) receive vertical and horizontal load to be fixed.
3. The special fixture for drilling experiments of laminated composite materials according to claim 1, wherein: the two sides of the left sliding block (16) and the right sliding block (8) are respectively provided with a sliding groove for sliding connection of the opening end of the thickness adjusting plate (4), and the two sliding blocks are respectively in threaded connection with the thickness adjusting plate (4) through a positioning bolt (11), a gasket (12) and a gasket (13).
4. The special fixture for drilling experiments of laminated composite materials according to claim 1, wherein: the base (3) is placed on the dynamometer through the base plate (6) and the connecting plate (19), is fixed on a machine tool workbench by means of the fixing bolts and the pressing plate tool, and data are acquired by the dynamometer and then input into the computer in the experimental process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110728865.XA CN113442077B (en) | 2021-06-29 | 2021-06-29 | Special fixture for drilling experiment of laminated composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110728865.XA CN113442077B (en) | 2021-06-29 | 2021-06-29 | Special fixture for drilling experiment of laminated composite material |
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| Publication Number | Publication Date |
|---|---|
| CN113442077A CN113442077A (en) | 2021-09-28 |
| CN113442077B true CN113442077B (en) | 2024-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110728865.XA Active CN113442077B (en) | 2021-06-29 | 2021-06-29 | Special fixture for drilling experiment of laminated composite material |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113884375A (en) * | 2021-09-29 | 2022-01-04 | 中国航发动力股份有限公司 | Auxiliary clamp for blade hardness detection |
| CN113909946A (en) * | 2021-11-04 | 2022-01-11 | 盐城工学院 | Heterogeneous material laminated or laminated component machining clamp and machining method |
| CN115266423B (en) * | 2022-08-10 | 2024-09-20 | 哈尔滨工业大学 | Penetration test device |
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| Publication number | Publication date |
|---|---|
| CN113442077A (en) | 2021-09-28 |
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