CN107063538B - Clamping device for testing residual stress of sample by blind hole method - Google Patents
Clamping device for testing residual stress of sample by blind hole method Download PDFInfo
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- CN107063538B CN107063538B CN201710167775.1A CN201710167775A CN107063538B CN 107063538 B CN107063538 B CN 107063538B CN 201710167775 A CN201710167775 A CN 201710167775A CN 107063538 B CN107063538 B CN 107063538B
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- clamping block
- top surface
- residual stress
- blind hole
- platform frame
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0047—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to residual stresses
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a clamping device for testing residual stress of a sample by a blind hole method, which comprises a base; the test bench is fixedly arranged above the base, a first clamping block and a second clamping block are fixedly arranged on the test bench, and the first clamping block and the second clamping block are transversely arranged side by side; the movable clamping block is arranged between the first clamping block and the second clamping block in a sliding manner, and the top surface of the first clamping block is flush with the top surface of the movable clamping block; the screw rod penetrates through the second clamping block and abuts against the movable clamping block, and the screw rod is in threaded connection with the second clamping block. The clamping device can solve the technical problems of unstable punching process and low punching accuracy caused by the fact that a plane drill floor has no horizontal supporting plane.
Description
Technical Field
The invention relates to the technical field of clamps for testing residual stress in materials, in particular to a clamping device for testing residual stress of a sample by a blind hole method.
Background
Various processes such as casting, cutting, welding, heat treating, etc., of mechanical parts and components during the manufacturing process can create residual stresses in the material. The existence of residual stress can reduce the strength of the workpiece, and can cause the workpiece to generate technical defects such as deformation, cracking and the like during manufacturing. In the natural release process after manufacture, the existence of residual stress can also change the size of the workpiece or reduce the mechanical properties such as fatigue strength, thereby affecting the use safety of the workpiece. Therefore, understanding the state of residual stress is of great importance to ensure the safety and reliability of the workpiece.
The method for testing the residual stress of the cylindrical material by the blind hole method comprises the following steps: a small hole is drilled on a cylindrical material sample with residual stress, the residual stress near the small hole is released, the residual stress field near the hole area is changed accordingly, and the residual stress value before the release of the drilling position on the cylinder can be calculated only by measuring the strain change quantity of the local area. The centering accuracy of the drilling is controlled and adjusted through the microscope, the sample cannot vibrate, the plane drill floor is required to be horizontally placed on a plane and fixed in the process of punching the sample, the punching is accurate, and the experimental data is ensured to be effective and accurate.
At present, most mechanical clamps can clamp a sample, a microscope is aligned to a center point, and a punching process is completed. However, due to the different sizes and different shapes of different samples, the stability of sample perforation cannot be ensured in the process of perforating and measuring the samples, so that the plane drill floor is balanced on a horizontal plane. Therefore, in the process of testing the residual stress of the cylindrical material by the blind hole method, a cylindrical clamping device with better clamping effect is needed.
Disclosure of Invention
The invention aims to provide a clamping device for testing residual stress of a sample by a blind hole method, which can solve the technical problems of unstable punching process and low punching accuracy caused by a horizontal supporting plane of a plane drill floor.
In order to solve the technical problems, the invention adopts the following technical scheme: a clamping device for testing residual stress of a sample by a blind hole method comprises a base; the test bench is fixedly arranged above the base, a first clamping block and a second clamping block are fixedly arranged on the test bench, and the first clamping block and the second clamping block are transversely arranged side by side; the movable clamping block is arranged between the first clamping block and the second clamping block in a sliding manner, and the top surface of the first clamping block is flush with the top surface of the movable clamping block; the screw rod penetrates through the second clamping block and abuts against the movable clamping block, and the screw rod is in threaded connection with the second clamping block.
As an improved mode, still include the support frame, the support frame set up in first clamp splice with move between the clamp splice, the support frame includes first triangle platform frame and second triangle platform frame, first triangle platform frame with first clamp splice fixed connection, the top surface of first triangle platform frame with the top surface of first clamp splice looks parallel and level, the second triangle platform frame with move clamp splice fixed connection, the top surface of second triangle platform frame with move the top surface of clamp splice looks parallel and level.
As an improvement mode, the test bench is provided with a transverse sliding rail, and the movable clamping block is slidably arranged on the sliding rail.
As an improved mode, the test bench is provided with a transverse chute, the bottom of the movable clamping block is fixedly provided with a sliding block, and the sliding block is arranged in the chute.
As an improved mode, two ends of the sliding block are semicircular, and a semicircular groove matched with the end of the sliding block is formed in the end of the sliding groove.
As an improvement, a boss is arranged on the left side of the first clamping block, and the top surface of the boss is flush with the top surface of the first clamping block.
As an improvement, the base is provided with a foundation bolt hole.
As an improvement, the movable clamping block is in threaded connection with the screw.
By adopting the technical scheme, the invention has the following beneficial effects:
the cylinder sample is clamped between the first clamping block and the clamping surface of the movable clamping block, the screw is screwed into the right sliding block, the screw is propped against the movable clamping block, the movable clamping block is propped against the cylinder sample on the first clamping block, the cylinder sample is fixed and firm, the cylinder sample can be kept motionless in the drilling process, the drilling precision is greatly improved, and the measuring error is reduced. The clamping device can provide a smooth horizontal supporting surface for the plane drill floor, increases the contact area between the triangular support of the plane drill floor and the supporting plane, facilitates the alignment of a microscope to a punching center, also enhances the stability of the punching process, and has the advantages of convenient disassembly and assembly, easy operation, simple processing and easy carrying.
Because still include the support frame, the support frame set up in first clamp splice with move between the clamp splice, the support frame includes first triangle platform frame and second triangle platform frame, first triangle platform frame with first clamp splice fixed connection, the top surface of first triangle platform frame with the top surface of first clamp splice looks parallel and level, the second triangle platform frame with move clamp splice fixed connection, the top surface of second triangle platform frame with move the top surface of clamp splice looks parallel and level, can select for use the triangle fixed platform frame of different size sizes according to the size of cylinder, adjust supporting platform's width.
Because be equipped with horizontal spout on the testboard, move the fixed slider that is equipped with in clamp splice bottom, the slider is arranged in the spout, the simple structure of this structure is convenient for install and clean.
Because the left side of first clamp splice is equipped with the boss, the top surface of boss with the top surface of first clamp splice looks parallel and level sets up the boss and can make the work support of microscope have abundant position when confirming the operating point.
Because the base is equipped with the rag bolt hole, can make whole anchor clamps stable motionless at the in-process of drilling through installing rag bolt in the rag bolt hole, improve the precision of drilling.
Drawings
FIG. 1 is a schematic view of a first embodiment of the present invention;
FIG. 2 is an assembly diagram of a base and a test stand according to a first embodiment of the present invention;
FIG. 3 is a schematic view of a movable clamping block according to a first embodiment of the present invention;
FIG. 4 is a schematic view of a first triangular platform according to a first embodiment of the present invention;
in the figure, a 1-base, a 101-sliding groove, 102-foundation bolt holes, a 2-test bench, a 3-first clamping block, a 4-second clamping block, a 5-movable clamping block, a 51-sliding block, a 6-boss, a 7-screw, an 8-triangular support, a 91-first triangular platform frame and a 92-second triangular platform frame.
Detailed Description
Example 1
Referring to fig. 1 and 2 together, a clamping device for testing residual stress of a sample by a blind hole method comprises a base 1, wherein the base 1 is provided with a foundation bolt hole 102, and the whole clamp can be stable and motionless in the drilling process by installing the foundation bolt in the foundation bolt hole 102, so that the drilling precision is improved. In addition, a measure of applying a certain pressure on the periphery of the base 1 can be adopted to stabilize the whole clamp.
The top surface of the test bench 2 is provided with two transverse grooves, threaded through holes are respectively formed in the grooves, the test bench 2 is fixedly installed above the base 1 through threaded fasteners penetrating through the threaded through holes, the test bench 2 is fixedly provided with a first clamping block 3 and a second clamping block 4, and the first clamping block 3 and the second clamping block 4 are arranged side by side along the transverse direction. The left side of first clamp splice 3 is equipped with boss 6, and the top surface of boss 6 is parallel and level with the top surface of first clamp splice 3. The provision of the boss 6 allows the working support of the microscope to be adequately positioned in determining the working point. In this embodiment, the test bench 2, the first clamping block 3, the second clamping block 4 and the boss 6 are integrally formed.
As shown in conjunction with fig. 1 to 3, the movable clamping block 5 is slidably disposed between the first clamping block 3 and the second clamping block 4, the movable clamping block 5 and the first clamping block 3 are respectively provided with a clamping surface facing each other, and the top surface of the first clamping block 3 is flush with the top surface of the movable clamping block 5. The test bench 2 is provided with a transverse chute 101, the bottom of the movable clamping block 5 is fixedly provided with a sliding block 51, two ends of the sliding block 51 are semicircular, and the sliding block 51 is arranged in the chute 101. Both ends of the chute 101 are respectively provided with semicircular grooves matched with the ends of the slide blocks 51. The screw rod 7 penetrates through the second clamping block 4 and abuts against the movable clamping block 5, and the screw rod 7 is in threaded connection with the second clamping block 4. In this embodiment, the movable clamp block 5 is in threaded connection with the screw rod 7.
And in combination with fig. 1 and fig. 4, a support frame is arranged between the first clamping block 3 and the movable clamping block 5, the support frame comprises a first triangular platform frame 91 and a second triangular platform frame 92, the first triangular platform frame 91 is fixedly connected with the first clamping block 3 through a threaded fastener, the top surface of the first triangular platform frame 91 is flush with the top surface of the first clamping block 3, the second triangular platform frame 92 is fixedly connected with the movable clamping block 5 through a threaded fastener, and the top surface of the second triangular platform frame 92 is flush with the top surface of the movable clamping block 5. The first triangular platform frame 91 and the second triangular platform frame 92 are subjected to greater pressure by utilizing the principle of triangle stability. The triangle platform frame can select the model of different specification length sizes according to the different sizes of experimental cylinder, and when the sample of diameter ratio small cylinder, I need not triangle platform frame, I need free dismouting to satisfy the demand of experimental process.
The application method of the invention comprises the following steps:
the cylinder sample to be tested is clamped between the first clamping block 3 and the movable clamping block 5, the screw 7 is manually screwed into the second clamping block 4, the screw 7 pushes the movable clamping block 5 to transversely slide, the cylinder is clamped between the first clamping block and the movable clamping block, the cylinder is kept motionless under the pressure of the horizontal direction, and the microscope tripod is kept on the horizontal working plane. The inside of the groove of the test board 2 is kept clean and tidy before each test, the movable clamping blocks 5 can be freely detached, the sliding grooves 101 are conveniently cleaned and lubricated, the influence of impurities on the experimental process is reduced, and the accuracy of experimental data is improved.
The clamp device not only can clamp the sample effectively, but also can provide a horizontal supporting plane for the plane drill floor, increases the contact area between the triangular support 8 of the plane drill floor and the supporting plane, facilitates the alignment of a microscope to a punching center, and also enhances the stability of the punching process.
Example two
The structure of this embodiment is basically the same as that of the first embodiment, except that the test bench 2 is provided with a transverse slide rail, and the movable clamp block 5 is slidably mounted on the slide rail.
Claims (7)
1. The utility model provides a clamping device of blind hole method test sample residual stress which characterized in that includes: a base;
the test bench is fixedly arranged above the base, a first clamping block and a second clamping block are fixedly arranged on the test bench, and the first clamping block and the second clamping block are transversely arranged side by side;
the movable clamping block is arranged between the first clamping block and the second clamping block in a sliding manner, and the top surface of the first clamping block is flush with the top surface of the movable clamping block;
the screw penetrates through the second clamping block and abuts against the movable clamping block, and the screw is in threaded connection with the second clamping block;
the support frame is arranged between the first clamping block and the movable clamping block, the support frame comprises a first triangular platform frame and a second triangular platform frame, the first triangular platform frame is fixedly connected with the first clamping block, the top surface of the first triangular platform frame is flush with the top surface of the first clamping block, the second triangular platform frame is fixedly connected with the movable clamping block, and the top surface of the second triangular platform frame is flush with the top surface of the movable clamping block; the triangular platform frame selects the models with different specifications and lengths according to the different sizes of the experimental cylinders.
2. The device for clamping residual stress of a test specimen by a blind hole method according to claim 1, wherein the test bench is provided with a transverse slide rail, and the movable clamping block is slidably mounted on the slide rail.
3. The device for clamping residual stress of a test sample by a blind hole method according to claim 1, wherein the test bench is provided with a transverse chute, the bottom of the movable clamping block is fixedly provided with a sliding block, and the sliding block is arranged in the chute.
4. The device for clamping residual stress of a test sample by using a blind hole method according to claim 3, wherein the two ends of the sliding block are semicircular, and a semicircular groove matched with the end of the sliding block is formed in the end of the sliding groove.
5. The blind hole test specimen residual stress clamping device according to claim 4, wherein a boss is arranged on the left side of the first clamping block, and the top surface of the boss is flush with the top surface of the first clamping block.
6. A blind hole method test specimen residual stress clamping device as claimed in claim 3, wherein said base is provided with a foundation bolt hole.
7. The device for clamping residual stress of a test sample by a blind hole method according to claim 1, wherein the movable clamping block is in threaded connection with the screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710167775.1A CN107063538B (en) | 2017-03-21 | 2017-03-21 | Clamping device for testing residual stress of sample by blind hole method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710167775.1A CN107063538B (en) | 2017-03-21 | 2017-03-21 | Clamping device for testing residual stress of sample by blind hole method |
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| Publication Number | Publication Date |
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| CN107063538A CN107063538A (en) | 2017-08-18 |
| CN107063538B true CN107063538B (en) | 2023-06-23 |
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| CN107813236B (en) * | 2017-10-31 | 2024-04-26 | 浙江工业大学 | Clamping device for stress detection of lamp shade of car lamp |
| CN112284891A (en) * | 2020-09-04 | 2021-01-29 | 山东国晶新材料有限公司 | Clamping rod extrusion testing device and using method |
| CN114295260B (en) * | 2021-12-29 | 2024-03-26 | 福建省锅炉压力容器检验研究院 | Weld joint residual stress reliability simulation test device |
| CN114577698B (en) * | 2022-02-24 | 2023-12-12 | 青岛理工大学 | Concrete permeability detection device and method |
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