Clamping device for strain fatigue test
The strain fatigue test clamping device addresses the issue of bending and wrinkling in thin plate tests by using a dual-clamp system with gaps and polytetrafluoroethylene pads, ensuring accurate fatigue testing results.
Patent Information
- Application Number
- CN202420541400.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-03-19
AI Technical Summary
Existing clamping tools for thin plate workpieces bend or wrinkle the sample during compression fatigue tests, leading to inaccurate test data due to direct clamping on both sides, which is not suitable for thin plates with a wall thickness of ≤2mm.
A strain fatigue test clamping device with two sets of clamps, including a square clamp and a long clamp, where the thin plate is placed between, with a gap between the long clamp and the slot to avoid contact, using polytetrafluoroethylene pads for isolation, and bolts with hexagonal grooves for easy assembly, and limit rods to prevent deviation during testing.
The device effectively prevents bending or wrinkling of thin plates during tests, allowing accurate tensile and compression fatigue testing by clamping the sample in all directions without exposure, ensuring precise and practical results.
Smart Images
Figure CN222144708U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to fatigue test equipment, in particular to a strain fatigue test clamping device. Background Art
[0002] For some thin plate workpieces (wall thickness ≤ 2mm), fatigue tests will be carried out on them after processing to detect their fatigue resistance. With the existing method, the workpiece sample is usually clamped and positioned with a fixture, and then the workpiece sample is subjected to tensile fatigue test and compression fatigue test to detect the change of the workpiece and the tolerance limit value.
[0003] The existing clamping tools are generally divided into two positions to clamp the thin plate workpiece specimen (referred to as thin plate specimen), that is, to clamp and fix it on both sides of the workpiece. Since the workpiece is thin, the workpiece specimen will bend or wrinkle during the compression fatigue test, resulting in inaccurate test data. Therefore, further improvement can be made. Utility Model Content
[0004] In order to solve the above-mentioned problems, the utility model provides the following technical solutions.
[0005] A strain fatigue test clamping device comprises two sets of clamps that fit together, the clamps comprising a square clamp and a long clamp, and the thin plate sample is placed between the square clamp and the long clamp, an empty groove is opened in the middle of one side of the square clamp, one end of the narrow side of the long clamp is inserted into the empty groove, a mounting plate is arranged on the top of the square clamp, threaded holes are opened in both sides of the mounting plate, the mounting plate is located in the threaded hole and is threadedly connected with bolts, and the bolts pass through the square clamp, a nut is threadedly sleeved on the outer side of one end of the bolt, and a pad is bonded to the opposite side surfaces of the two sets of clamps.
[0006] As an optimization, a gap is left between the end of the long splint inserted in the empty slot and the two side walls of the empty slot, and the gap is between 0.4mm and 0.6mm to avoid contact between the tooling.
[0007] As an optimization, a gap is left between the narrow side of the long clamping plate and the bottom wall of the empty slot, which facilitates adjustment when fatigue tests are performed on different workpiece samples, thereby improving applicability.
[0008] As an optimization, the spacing between the bolts is greater than the width of the wide side of the long clamping plate, and the wide side of the long clamping plate is located between the other two groups of bolts, so that the long clamping plate can slide between the bolts easily.
[0009] As an optimization, the pad is in direct contact with the thin plate sample. The pad is made of polytetrafluoroethylene plastic (i.e., a polytetrafluoroethylene plate). This structure can facilitate assembly and disassembly while preventing the thin plate sample from being damaged, while isolating the workpiece to avoid hard contact between the workpiece and the fixture.
[0010] As an optimization, a hexagonal groove is provided on the head of the bolt, and a slot is provided on the top of the mounting plate at the threaded hole. The nut is clamped in the slot and is restricted by the nut being clamped in the slot, making it convenient to turn the bolt to fix the mounting plate.
[0011] As an optimization, two limit rods are fixedly installed in the bottom wall of the empty slot, and holes are provided in the narrow side of the long splint corresponding to the limit rods, and the limit rods are inserted in the holes. The limit rods inserted in the holes will limit the long splint, preventing the long splint from being deviated to both sides and contacting the two side walls of the empty slot due to the force during the test.
[0012] Beneficial effects: The strain fatigue test clamping device is connected to the threaded hole through the square clamping plate by bolts, and the clamp is conveniently assembled and disassembled through nuts, and can clamp the thin plate sample in all directions, so that the thin plate sample is not partially exposed during the test, thereby effectively preventing the thin plate sample from bending or wrinkling during the test; in this scheme, the thin plate sample is clamped by the long clamping plate and the square clamping plate inserted in the empty groove, which can not only smoothly carry out tensile fatigue test and compression fatigue test, but also prevent the thin plate sample from bending or wrinkling. The structure is simple and ingenious, convenient and practical. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the structure of the utility model;
[0014] Figure 2 This is an exploded schematic diagram of the structure of the utility model;
[0015] Figure 3 This is an exploded schematic diagram of the fixture structure of the utility model;
[0016] Figure 4 It is a schematic diagram of the limiting structure of the utility model.
[0017] In the figure: 1. square clamp; 2. long clamp; 3. thin plate sample; 4. empty slot; 5. mounting plate; 6. threaded hole; 7. bolt; 8. nut; 9. pad; 10. hexagonal slot; 11. slot; 12. limit rod; 13. socket. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0019] See also Figure 1-2 A strain fatigue test clamping device includes two sets of clamps 3 that fit each other, the clamps include a square clamp 1 and a long clamp 2, and the thin plate sample 3 is placed between the square clamp 1 and the long clamp 2. An empty slot 4 is opened in the middle of one side of the square clamp 1, and one end of the narrow side of the long clamp 2 is inserted into the empty slot 4. A gap is left between the end of the long clamp 2 inserted into the empty slot 4 and the two side walls of the empty slot 4, and the gap is between 0.4mm-0.6mm to avoid contact between the fixtures; a gap is left between the narrow side of the long clamp 2 and the bottom wall of the empty slot 4, which is convenient for adjustment when fatigue tests are performed on different workpiece samples to improve applicability;
[0020] See also Figure 1-2 A mounting plate 5 is provided on the top of the square plywood 1, and threaded holes 6 are opened on both sides of the mounting plate 5. Bolts 7 are connected to the inner threads of the threaded holes 6 of the mounting plate 5, and the bolts 7 pass through the square plywood 1. The spacing between the bolts 7 is greater than the width of the wide side of the long plywood 2. The wide side of the long plywood 2 is located between the other set of bolts 7 on both sides, so that the long plywood 2 can slide between the bolts 7 conveniently.
[0021] See also Figure 1-2 A nut 8 is provided on the outer threaded sleeve of one end of the bolt 7, and a pad 9 is bonded to the surface of the opposite side of the two sets of clamps. The pad 9 is in direct contact with the thin plate sample 3. The pad 9 is made of polytetrafluoroethylene plastic. Since polytetrafluoroethylene has an extremely low friction coefficient, it can play a lubricating role and isolate the workpiece at the same time to avoid hard contact between the workpiece and the clamp.
[0022] See also Figure 2-3 A hexagonal groove 10 is provided at the head of the bolt 7, and a slot 11 is provided at the top of the mounting plate 5 at the threaded hole 6. The nut 8 is clamped in the slot 11, and the nut 8 is restricted by being clamped in the slot 11, so that the bolt 7 is conveniently turned to fix the mounting plate 5.
[0023] See also Figure 4 Two limit rods 12 are fixedly installed in the bottom wall of the empty slot 4, and a socket 13 is provided in one side of the narrow side of the long splint 2 corresponding to the limit rod 12, and the limit rod 12 is inserted into the socket 13. The limit rod 12 is inserted into the socket 13 to limit the long splint 2, thereby preventing the long splint 2 from being deviated to both sides and contacting the two side walls of the empty slot 4 during the test.
[0024] When using, refer to Figure 1-4 First, insert one end of the narrow side of the long plywood 2 into the empty slot 4, then place the mounting plate 5 on the top side of the square plywood 1, and place the nut 8 in the slot 11, then screw the bolt 7 into the threaded hole 6, and it will be screwed into the nut 8 as it rotates, and then the mounting plate 5 will be fixed to the top side of the square plywood 1, and it will be pressed on the top side of the long plywood 2 located in the empty slot 4, then fit the two sets of assembled clamps together, and place the thin plate sample 3 between the two sets of clamps, and then the thin plate sample 3 can be subjected to fatigue test.
[0025] The bolt 7 passes through the square clamp 1 and is threadedly connected to the threaded hole 6, and the nut 8 is used to facilitate the assembly and disassembly of the clamp. At the same time, since the thin plate sample 3 is clamped in all directions, the thin plate sample 3 is not partially exposed during the test, thereby effectively preventing the thin plate sample 3 from bending or wrinkling during the test. In this scheme, the thin plate sample is clamped by the long clamp 2 and the square clamp 1 inserted in the empty groove 4, which can not only smoothly carry out tensile fatigue tests and compressive fatigue tests, but also prevent the thin plate sample from bending or wrinkling. The structure is simple and ingenious, convenient and practical.
Claims
1. A strain fatigue test clamping device, comprising two sets of clamps fitted to each other, Features: The clamp comprises a square clamp (1) and a long clamp (2), and the thin plate sample (3) is placed between the square clamp (1) and the long clamp (2), a hollow groove (4) is opened in the middle of one side of the square clamp (1), and one end of the narrow side of the long clamp (2) is inserted into the hollow groove (4), and a mounting plate (5) is arranged on the top of the square clamp (1), and threaded holes (6) are opened in both sides of the mounting plate (5), and the mounting plate (5) is threadedly connected with a bolt (7) located inside the threaded hole (6), and the bolt (7) passes through the square clamp (1), and a nut (8) is threadedly sleeved on the outer side of one end of the bolt (7), and a pad (9) is bonded to the surface of the opposite side of the two sets of clamps.
2. The strain fatigue test clamping device according to claim 1, Features: A gap is left between the end of the long clamping plate (2) inserted into the empty slot (4) and the two side walls of the empty slot (4), and the gap is between 0.4 mm and 0.6 mm.
3. The strain fatigue test clamping device according to claim 1, Features: A gap is left between the narrow side of the long splint (2) and the bottom wall of the empty slot (4).
4. The strain fatigue test clamping device according to claim 1, Features: The spacing between the bolts (7) is greater than the width of the wide side of the long clamping plate (2), and the wide side of the long clamping plate (2) is located between the other two side bolts (7).
5. The strain fatigue test clamping device according to claim 1, Features: The backing plate (9) is in contact with the thin plate sample (3), and the backing plate (9) is made of a polytetrafluoroethylene plate.
6. The strain fatigue test clamping device according to claim 1, Features: The head of the bolt (7) is provided with a hexagonal groove (10), the top of the mounting plate (5) located at the threaded hole (6) is provided with a slot (11), and the nut (8) is snap-fitted into the slot (11).
7. The strain fatigue test clamping device according to claim 1, Features: Two limiting rods (12) are fixedly installed in the bottom wall of the hollow slot (4), and a plug hole (13) is provided in one narrow side of the long clamping plate (2) corresponding to the limiting rod (12), and the limiting rod (12) is plugged into the plug hole (13).