Sheet sample auxiliary tool for testing
By designing auxiliary fixtures suitable for thin-film samples, the problem of vertical placement of thin-film samples in TMA testing and DIL thermal expansion apparatus was solved, enabling a more efficient and accurate testing process and reducing the risk of equipment damage and sample drop.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA ACADEMY OF SPACE TECHNOLOGY
- Filing Date
- 2025-05-30
- Publication Date
- 2026-05-26
AI Technical Summary
Existing TMA testing and DIL thermal expansion meter equipment cannot accurately measure long, thin sheet samples because the samples are difficult to place vertically, resulting in large deviations in measurement results and the risk of damaging the probe.
Design a thin-film sample auxiliary fixture, including a grooved cubic block and flat-head screws, for fixing and protecting the thin-film sample, ensuring its vertical placement, and being removable without affecting the measurement.
It improves the accuracy of thin-section sample placement and testing efficiency, prevents samples from falling, reduces equipment damage, and shortens sample placement time by 80%.
Smart Images
Figure CN224274761U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of tooling products for material testing and analysis, and in particular, an auxiliary tooling for testing thin sheet samples. Background Technology
[0002] Thermal expansion (TMA) testing and analysis can be used to measure parameters such as the coefficient of thermal expansion, glass transition temperature, and phase transition point of materials including metallic materials, non-metallic materials, and composite materials. It is one of the important means of characterizing the thermal properties of materials. In addition, the push-rod type DIL thermal expansion meter, as a commonly used thermal performance testing device, is also one of the important means of characterizing the coefficient of thermal expansion, phase transition temperature, etc.
[0003] In TMA testing, the push-rod mode is one of the most commonly used modes. However, mainstream equipment from manufacturers such as Netzsch and TA currently uses an upright mode in this mode. The sample needs to be placed upright on the platform, supported by a quartz rod, and fixed with a certain load before the heating and cooling performance test is performed. However, this placement method is quite difficult for long, thin samples (thickness less than 2mm). Such samples are difficult to stand upright on their own. Even with push-rod support and fine-tuning, there will still be tilting, insufficient uprightness, and misalignment, leading to significant deviations in the measurement results. Over time, this may damage the accuracy of the push-rod. Furthermore, if the sample softens when heated to high temperatures, it is easy to tip over and fall, resulting in measurement failure.
[0004] Similarly, the DIL thermal expansion meter has a flat sample cell. The sample is placed in the sample cell and the two ends of the sample are clamped by the probe for detection. The above problem also exists when placing long strips or thin slices, which affects the accuracy of the measurement.
[0005] For equipment that requires clamping both ends of the sample for testing, when the sample is a long strip or thin sheet, there are problems such as the sample being difficult to stand upright on its own, and there are phenomena such as tilting, insufficient uprightness, and misalignment, which leads to large deviations in the measurement results. Utility Model Content
[0006] The technical problem solved by this application is to overcome the shortcomings of the prior art and provide an auxiliary tooling for testing thin sheet samples. The purpose is to solve the problem that it is difficult to place thin sheet samples vertically and neatly during the current TMA test. It can effectively assist the thin sheet sample placement step and improve the testing efficiency and experimental accuracy.
[0007] This application proposes an auxiliary tooling product suitable for thin sheet samples. It is convenient, compact and effective. It can help the sample stand upright. After the top rod is fixed, it can be disassembled without affecting the sample. It can also be placed around the sample to act as a protective barrier to prevent the sample from falling off the platform. It does not contact the sample and does not affect the measurement process.
[0008] The technical solution provided in this application is as follows:
[0009] A thin-film sample auxiliary fixture for TMA testing includes:
[0010] This tooling product is assembled from a grooved cube block and flat-head screws. The cube block has flat upper and lower end faces and a through groove in the center. One side of the groove is exposed and the other side is closed. The sample is placed vertically in the groove. The overall square design makes it easy to hold with tweezers.
[0011] The cube has a circular hole at the front, located at the center of its height, slightly to the left or right (at the exact center of one side of the groove), and the back is closed without holes. A flat-head screw is placed in this hole. Tightening the screw secures the thin sample in the groove, and loosening the screw allows for sample removal.
[0012] Furthermore, the overall side length of the cube is (6-10) mm, and the height is (5-20) mm;
[0013] The height of the groove is the same as that of the cube, the length of the top and bottom surfaces is (5-9) mm, the width is (4-8) mm, the length and width of the groove are always smaller than the size of the cube, and the end face is rectangular;
[0014] The diameter of the screw hole should be 1 / 3 to 2 / 3 of the length of the upper and lower surfaces of the groove. Use a flat-head Phillips screw or an internal hex screw of the corresponding size. The screw head should be flat to prevent it from piercing the sample.
[0015] Furthermore, the cube block is made of metal or non-metal materials that can withstand high temperatures of 300°C, including but not limited to PEEK, polytetrafluoroethylene, nickel-based high-temperature alloys, alumina ceramics, etc., and the flat-head screw is a metal or non-metal screw that can withstand high temperatures of 300°C.
[0016] Furthermore, this tooling fixture is suitable for any thin sheet sample with a thickness less than the groove width and a height greater than the groove height, regardless of the material, and can be customized for different sample sizes.
[0017] The specific usage method of this fixture is as follows: ① Place the thin sample vertically in the groove; ② Tighten the screws to hold the sample in place, adjust the sample to be vertical, and do not tighten the screws too much, just enough to keep it slightly fixed so that it does not tip over or fall; ③ Place the fixture and sample in the center of the TMA stage, and move the top rod of the moving device to hold the top center of the thin sample; ④ Slightly loosen the screws, move the fixture so that it is not in contact with the sample, and the fixture can be placed on the stage to protect the sample. The sample placement process is now complete.
[0018] In summary, this application includes at least the following beneficial technical effects:
[0019] It can efficiently and quickly assist samples in standing upright on the platform. It is easy to operate, and clamping, fixing and disassembling are all convenient, reducing the sample placement time by 80%. The position is precisely adjustable and will not touch or damage the probe rod of the equipment. At the same time, the tooling is small in size and does not affect the sample testing. It can be placed on the platform to protect the sample and prevent it from softening and falling due to high temperature. Attached Figure Description
[0020] Figure 1 A schematic diagram of the tooling designed for this utility model patent (preferred dimensions);
[0021] Figure 2 This is a cross-sectional view of the buffer component.
[0022] Explanation of the reference numerals: 1. Cube block; 11. Groove; 12. Circular hole; 13. First plane; 14. Second plane; 15. Third plane;
[0023] 2. Screws;
[0024] 3. Buffer assembly; 31. Transition plate; 32. Pressure plate; 33. Buffer spring; 34. Sliding rod; 35. Cylinder rod; 36. Limiting part. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments disclosed in this application will be described in further detail below with reference to the accompanying drawings.
[0026] This application discloses an auxiliary tooling product for testing thin-film samples, such as... Figure 1 As shown, the device includes a cube block 1 and a screw 2. The cube block 1 has three sets of parallel opposing faces, and three adjacent and perpendicular faces are a first plane 13, a second plane 14, and a third plane 15. A groove 11 is provided on the surface of the first plane 13, extending through to the two second planes 14 at both ends of the first plane. The groove 11 is used to place a sample. The third plane 15 of the cube block 1 has one or more circular holes. The screw 2 is threaded into the circular holes, and the end of the screw 2 extends into the groove 11. When the screw 2 is tightened, the end of the screw 2 abuts against the sample, fixing the sample in the groove 11. When the screw 2 is loosened, the sample can be removed.
[0027] The direction from one second plane 14 to another second plane is the height direction of the groove 11. Multiple circular holes are sequentially distributed along the height direction of the groove 11. The dimension of the cube block 1 in the height direction of the groove 11 is smaller than the height of the sample. The direction from one first plane 13 to another first plane is the length direction of the groove 11. The diameter of the circular holes is 1 / 3 to 2 / 3 of the length of the groove 11.
[0028] The end of screw 2 that extends into groove 11 is flat. A flexible buffer pad or buffer assembly is connected to the end of screw 2 that extends into groove 11.
[0029] Example 1
[0030] A TMA testing sheet sample auxiliary tooling product, with the following specific design dimensions (including but not limited to):
[0031] The fixture is a 7mm*7mm*10mm cube made of nickel-based high-temperature alloy. A through-groove is cut slightly to the right of the center, with the top and bottom edges of groove 11 measuring 6mm*3mm respectively. A 2mm diameter circular hole with threads is cut into the front of the cube to accommodate two Φ2mm stainless steel flat-head Phillips screws (5mm long). This fixture is suitable for thin sheet samples with a thickness of up to 3mm and a length of over 10mm, assisting in quickly and uprighting them on the TMA equipment stage.
[0032] The end of the screw 2 that extends into the groove 11 is flat, and a flexible buffer pad is connected to the end of the screw 2 that extends into the groove 11.
[0033] Example 2
[0034] like Figure 2 As shown, the difference from Embodiment 1 is that: the end of the screw 2 is connected to the buffer assembly 3, which includes a transition plate 31, a clamping plate 32, a buffer spring 33, a sliding rod 34, and a cylindrical rod 35. The transition plate 31 and the clamping plate 32 are both located in the groove 11. The end of the screw 2 is rotatably connected to the transition plate 31. The clamping plate 32 is located on the side of the transition plate 31 away from the screw 2. The transition plate 31 is fixedly connected to at least two cylindrical rods 35. The side of the cube block 1 with the circular hole is also provided with a through hole. The cylindrical rod 35 passes through the through hole of the cube block 1 and is slidably connected to the cube block 1. The clamping plate 32 is fixedly connected to the sliding rod 34. The sliding rod 34 is slidably connected inside the cylindrical rod 35. The buffer spring 33 is sleeved on the outside of the sliding rod 34 and is located between the transition plate 31 and the clamping plate 32. The end of the sliding rod 34 away from the pressure plate 32 extends out of the cylinder rod 35, and the extended part of the sliding rod 34 is connected to the limiting part 36. The limiting part 36 is used to limit the cylinder rod 35, so that when the cylinder rod 35 contacts the limiting part 36 under the action of the buffer spring 33, the buffer spring 33 is in a compressed state.
[0035] Specifically, the limiting part 36 can be a nut.
[0036] The sample is placed between the clamping plate 32 and the inner wall of the groove 11. When the screw 2 is turned, the screw 2 moves the transition plate 31 and the clamping plate 32 together until the clamping plate 32 contacts the sample. If the screw 2 is turned further, the clamping plate 32 will not move, the transition plate 31 will move, the buffer spring 33 will be compressed, and the clamping degree of the clamping plate 32 on the sample will increase.
[0037] The contents not described in detail in this application specification are common knowledge to those skilled in the art.
[0038] The present application has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present application. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and implementation methods of the present application without departing from the spirit and scope of the present application, and all such modifications and improvements fall within the scope of the present application. The scope of protection of the present application is determined by the appended claims.
Claims
1. An auxiliary tooling for testing thin sheet samples, characterized in that, include: The cube block (1) has three sets of opposite faces that are parallel to each other. The three faces that are adjacent to each other and perpendicular to each other are the first plane (13), the second plane (14) and the third plane (15). A groove (11) is provided on the surface of the first plane (13). The groove (11) extends through to the two second planes (14) at both ends of the first plane (13). The groove (11) is used to place the sample. A circular eyelet (12) is provided on the third plane (15) of the cube block (1); Screw (2) is threaded into a circular hole (12), and the end of screw (2) extends into a groove (11); tightening screw (2) is used to fix the sample in the groove (11), and loosening screw (2) is used to remove the sample.
2. The auxiliary tooling for testing thin-film samples according to claim 1, characterized in that: The direction in which one of the second planes (14) points to another second plane (14) is the height direction of the groove (11), and one or more circular holes (12) are provided along the height direction of the groove (11).
3. The auxiliary tooling for testing thin-film samples according to claim 1, characterized in that: The end of the screw (2) that extends into the groove (11) is flat, and the end of the screw (2) that extends into the groove (11) is connected to a flexible buffer pad.
4. The auxiliary tooling for testing thin-film samples according to claim 1, characterized in that: The size of the cube (1) in the height direction of the groove (11) is smaller than the height of the sample.
5. The auxiliary tooling for testing thin-film samples according to claim 1, characterized in that: The direction from one of the first planes (13) to the other first plane (13) is the length direction of the groove (11), and the diameter of the circular hole (12) is 1 / 3 to 2 / 3 of the length of the groove (11).
6. The auxiliary tooling for testing thin-film samples according to claim 1, characterized in that: The end of the screw (2) extending into the groove (11) is connected to a buffer assembly (3). The buffer assembly (3) includes a transition plate (31), a clamping plate (32), a buffer spring (33), a sliding rod (34), and a cylinder rod (35). The transition plate (31) and the clamping plate (32) are both located in the groove (11). The end of the screw (2) is rotatably connected to the transition plate (31). The clamping plate (32) is located on the side of the transition plate (31) away from the screw (2). 31) At least two cylindrical rods (35) are fixedly connected. The side of the cube block (1) with a circular hole (12) is also provided with a through hole. The cylindrical rod (35) passes through the through hole of the cube block (1) and is slidably connected to the cube block (1). The pressing plate (32) is fixedly connected to the sliding rod (34). The sliding rod (34) is slidably connected inside the cylindrical rod (35). The buffer spring (33) is sleeved outside the sliding rod (34) and located between the transition plate (31) and the pressing plate (32).
7. The auxiliary tooling for testing thin-film samples according to claim 6, characterized in that: The end of the sliding rod (34) away from the pressure plate (32) extends out of the cylinder rod (35), and the extended part of the sliding rod (34) is connected to the limiting part (36). The limiting part (36) is used to limit the cylinder rod (35) so that when the cylinder rod (35) contacts the limiting part (36) under the action of the buffer spring (33), the buffer spring (33) is in a compressed state.