Die for testing electromagnetic shielding by waveguide method
By designing a mold for waveguide testing and combining with the appropriate pressure treatment of the press, the problems of uneven sample thickness, easy deformation, and large dimensional errors in the production of waveguide testing splines were solved, and the effect of uniform sample thickness, accurate dimensionality and reduced test errors was achieved.
Patent Information
- Application Number
- CN202421399326.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-19
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-06-19
AI Technical Summary
The production of existing waveguide test splines has problems such as uneven sample thickness, easy deformation, large size error, high cost and inaccurate test results. Especially in the case of pressurization, the accuracy of the measurement results cannot be ensured.
A mold consisting of mutually matching male and female molds is designed, and used in combination with a press to ensure uniform thickness of the sample and not easily deform, thereby reducing test errors.
The uniformity of the sample thickness and dimensional accuracy are improved, the test error and cost are reduced, and the accuracy of the test data is ensured.
Smart Images
Figure CN222895970U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of electromagnetic shielding, in particular to a mold used for testing electromagnetic shielding by a waveguide method. Background Art
[0002] The booming development of modern communication technology and the widespread application of flexible wearable electronic products will inevitably produce adverse electromagnetic radiation pollution, seriously interfering with the normal operation of nearby equipment and threatening human health. Among electromagnetic shielding materials, sheet / film materials have become a research hotspot.
[0003] The electromagnetic parameters of materials are important factors affecting shielding performance. When using the waveguide method to test the electromagnetic parameters of materials, connect one port of two coaxial cables to the input or output port of the vector network analyzer, place the material to be tested between the ports of the two coaxial cables, and connect the male and female ports to measure the electromagnetic parameters of the material.
[0004] The waveguide method has very high requirements on the size of the test specimen. In order to avoid errors caused by gaps, the test specimen must achieve complete gapless contact with the rectangular waveguide. Therefore, there are strict requirements on the tolerance of the length and width of the test specimen, which must match the size of the rectangular waveguide cavity to ensure that when the test specimen is placed in the waveguide cavity, each side of the specimen is in close contact with the waveguide cavity.
[0005] At present, the production of waveguide test specimens mostly adopts the mold casting method, which mixes the raw materials to be tested (usually epoxy resin, paraffin) with the adhesive and directly casts them in a mold with the same size as the waveguide hole; irregular mixed materials can also be extruded to form sheet or film samples, and then cut according to the size of the waveguide to obtain the samples. The disadvantage is that the sample thickness is uneven, it is very easy to deform, and it is easy to cause large errors in the size of the test specimen. After manual polishing, the size is too small to be used and the test specimen is broken. It not only affects the test results, but also increases the cost.
[0006] For some special materials that need to be pressurized, the mold casting method cannot meet the specific pressure, making the test specimen thicker and the internal structure loose, and the accuracy of the measurement results cannot be ensured. Utility Model Content
[0007] The utility model aims to provide a mold for testing electromagnetic shielding by a waveguide method. The sample making mold is not only low in cost but also has good repeatability. No residual sample is left in the waveguide cavity after the test. Appropriate pressure is applied by a press machine, and the strength of the test sample is consistent, thereby ensuring the uniformity of the sample thickness and preventing deformation, thereby reducing the test error.
[0008] In order to achieve the above objectives, the technical solutions adopted are as follows:
[0009] A mold for testing electromagnetic shielding by a waveguide method, the mold consisting of a male mold and a female mold that match each other;
[0010] The male mold comprises a mold base and an outer conductor positioning plate, the upper end of the mold base is provided with a groove, the outer conductor positioning plate is arranged in the groove, and the outer conductor positioning plate is provided with a material placement cavity;
[0011] The female die comprises an upper pressing sheet, a lower pressing sheet and a pressing block punch, and the upper pressing sheet, the lower pressing sheet and the pressing block punch are arranged in the material placement cavity in sequence from bottom to top.
[0012] In the above solution, the mold base is a solid rectangular parallelepiped with a groove on the upper end.
[0013] In the above solution, the outer conductor positioning plate is a hollow cuboid.
[0014] In the above scheme, the upper pressing plate and the lower pressing plate are both gasket-type solid rectangular parallelepipeds, and the pressing block punch is a solid rectangular parallelepiped.
[0015] In the above solution, the mold base, the outer conductor positioning plate, the upper pressing plate, the lower pressing plate and the pressing block punch are all made of stainless steel.
[0016] In the above solution, the height of the mold base is equal to twice the height of the outer conductor positioning plate.
[0017] In the above solution, the length×width of the groove above the mold base=the length×width of the outer conductor positioning plate, and the depth of the groove above the mold base=1 / 3 the height of the outer conductor positioning plate.
[0018] In the above scheme, the length × width of the material placement cavity = the length × width of the upper pressing plate = the length × width of the lower pressing plate = the length × width of the pressing block punch, and the length × width × height of the upper pressing plate = the length × width × height of the lower pressing plate.
[0019] In the above solution, the height of the pressing block punch is 5 times the height of the outer conductor positioning plate.
[0020] In the above scheme, the length, width and height of the mold base are 45.00±0.01 mm, 45.00±0.01 mm and 20.00±0.01 mm respectively; the length, width and height of the groove above the mold base are 41.00±0.01 mm, 41.00±0.01 mm and 4.00±0.01 mm respectively; the length, width and height of the outer conductor positioning plate are 41.00±0.01 mm, 41.00±0.01 mm and 10.00±0.01 mm respectively; the length, width and height of the upper pressing plate and the lower pressing plate are 22.50±0.01 mm, 10.00±0.01 mm and 2.00±0.01 mm respectively; the length, width and height of the pressing block punch are 22.50±0.01 mm, 10.00±0.01 mm and 50.00±0.01 mm respectively.
[0021] Compared with the prior art, the beneficial effects of the utility model are as follows:
[0022] The utility model provides a mold for testing electromagnetic shielding by the waveguide method. The mold provided by the utility model is not only low in cost but also has good repeatability. There is no residual sample in the waveguide cavity after the test; the strength of the test sample is consistent by applying appropriate pressure through the press, ensuring the uniformity of the sample thickness and not easy to deform, solving the problem of sample "slag falling", reducing the test error, and the obtained sample has a higher dimensional accuracy, and the accuracy of the test data is further guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 The utility model is a three-dimensional structural schematic diagram of a mold used for testing electromagnetic shielding by a waveguide method.
[0024] Figure 2 This is a front view of a mold for testing electromagnetic shielding using a waveguide method according to the utility model;
[0025] Figure 3 The utility model is a schematic diagram of the exploded structure of a mold used for testing electromagnetic shielding by a waveguide method.
[0026] In the figure, 1. mold base, 2. outer conductor positioning plate, 3. material placement cavity, 4. upper pressing plate, 5. lower pressing plate, 6. pressing block punch. DETAILED DESCRIPTION
[0027] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.
[0028] See also Figures 1 to 3As shown, the utility model is a mold for testing electromagnetic shielding by waveguide method, a sheet / film sample preparation device suitable for testing electromagnetic parameters of materials by waveguide method, used in conjunction with a press, and composed of a male mold and a female mold that match each other, the male mold comprising a mold base 1 and an outer conductor positioning plate 2, wherein the mold base 1 is a solid rectangular parallelepiped with a groove at the upper end, the outer conductor positioning plate is a hollow rectangular parallelepiped, the outer conductor positioning plate 2 is arranged in the groove, and a material placement cavity 3 is opened inside the outer conductor positioning plate 2.
[0029] The female die includes an upper pressing plate 4, a lower pressing plate 5 and a pressing block punch 6. The upper pressing plate 4, the lower pressing plate 5 and the pressing block punch 6 are all solid rectangular parallelepipeds. The outer conductor positioning plate 2 is sleeved in the groove of the mold base 1. The upper pressing plate 4 is arranged in the material placement cavity 3, the lower pressing plate 5 is arranged on the upper pressing plate 4, the pressing block punch 6 is arranged on the lower pressing plate 5, and the material to be tested is placed between the upper pressing plate 4 and the lower pressing plate 5.
[0030] The mold base 1, the outer conductor positioning plate 2, the upper pressing plate 4, the lower pressing plate 5 and the pressing block punch 6 described in this embodiment are all made of stainless steel.
[0031] The length×width of the groove on the mold base 1 in this embodiment=the length×width of the outer conductor positioning plate 2; the depth of the groove on the mold base 1=1 / 3 the height of the outer conductor positioning plate 2;
[0032] The height of the mold base 1 is equal to twice the height of the outer conductor positioning plate 2 .
[0033] In this embodiment, the length×width of the material placement cavity 3=the length×width of the upper pressing plate 4=the length×width of the lower pressing plate 5=the length×width of the pressing block punch 6, and the length×width×height of the upper pressing plate 4=the length×width×height of the lower pressing plate 5. The height of the pressing block punch 6=5 times the height of the outer conductor positioning plate 2.
[0034] The length, width and height of the mold base described in this embodiment are 45.00±0.01 mm, 45.00±0.01 mm and 20.00±0.01 mm respectively; the length, width and height of the groove above the mold base are 41.00±0.01 mm, 41.00±0.01 mm and 4.00±0.01 mm respectively; the length, width and height of the outer conductor positioning plate are 41.00±0.01 mm, 41.00±0.01 mm and 10.00±0.01 mm respectively; the length, width and height of the upper pressing plate and the lower pressing plate are 22.50±0.01 mm, 10.00±0.01 mm and 2.00±0.01 mm respectively; the length, width and height of the pressing block punch are 22.50±0.01 mm, 10.00±0.01 mm and 50.00±0.01 mm respectively.
[0035] The mold described in this embodiment is fixed on the press when in use, and the positions of the male and female molds are aligned and adjusted and locked, and the material to be tested is placed between the upper pressing plate 4 and the lower pressing plate 5. Under the action of the press, the pressing block punch 6 is pressed down, and the lower pressing plate 5 moves downward to make the material to be tested fit tightly with the upper pressing plate 4. After a certain pressure and pressure holding time, after the pressure is released, the mold is disassembled to obtain a dense and compact sample. The prepared standard test sample is placed in the waveguide cavity for electromagnetic parameter testing.
[0036] The structure provided by the utility model can solve the problems of sample preparation difficulty, poor repeatability, difficulty in ensuring dimensional accuracy and influence of deformation on detection accuracy in the waveguide method, greatly save sample preparation time, reduce the preparation cost of the sample to be tested, and improve detection efficiency and accuracy.
[0037] Although the functions and operations of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific functions and operating procedures described above, and the specific implementations described above are only illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, all of which are within the protection of the present invention.
Claims
1. A mold for testing electromagnetic shielding by waveguide method, characterized in that: The mold is composed of a male mold and a female mold that match each other; The male mold comprises a mold base and an outer conductor positioning plate, the upper end of the mold base is provided with a groove, the outer conductor positioning plate is arranged in the groove, and the outer conductor positioning plate is provided with a material placement cavity; The female die comprises an upper pressing sheet, a lower pressing sheet and a pressing block punch, and the upper pressing sheet, the lower pressing sheet and the pressing block punch are arranged in the material placement cavity in sequence from bottom to top.
2. A mold for testing electromagnetic shielding by waveguide method according to claim 1, characterized in that: The mold base is a solid rectangular parallelepiped with a groove at the upper end.
3. A mold for testing electromagnetic shielding by waveguide method according to claim 1, characterized in that: The outer conductor positioning plate is a hollow cuboid.
4. A mold for testing electromagnetic shielding by waveguide method according to claim 1, characterized in that: The upper pressing plate and the lower pressing plate are both gasket-type solid rectangular parallelepipeds, and the pressing block punch is a solid rectangular parallelepiped.
5. The mold for testing electromagnetic shielding by waveguide method according to claim 1, characterized in that: The mold base, the outer conductor positioning plate, the upper pressing plate, the lower pressing plate and the pressing block punch are all made of stainless steel.
6. The mold for testing electromagnetic shielding by waveguide method according to claim 1, characterized in that: The height of the mold base is equal to twice the height of the outer conductor positioning plate.
7. The mold for testing electromagnetic shielding by waveguide method according to claim 1, characterized in that: The length×width of the groove above the mold base=the length×width of the outer conductor positioning plate, and the depth of the groove above the mold base=1 / 3 the height of the outer conductor positioning plate.
8. The mold for testing electromagnetic shielding by waveguide method according to claim 1, characterized in that: The length×width of the material placement cavity=the length×width of the upper pressing plate=the length×width of the lower pressing plate=the length×width of the pressing block punch, and the length×width×height of the upper pressing plate=the length×width×height of the lower pressing plate.
9. The mold for testing electromagnetic shielding by waveguide method according to claim 1, characterized in that: The height of the pressing block punch is 5 times the height of the outer conductor positioning plate.
10. The mold for testing electromagnetic shielding by waveguide method according to claim 1, characterized in that: The length, width and height of the mold base are 45.00±0.01 mm, 45.00±0.01 mm and 20.00±0.01 mm respectively; the length, width and height of the groove above the mold base are 41.00±0.01 mm, 41.00±0.01 mm and 4.00±0.01 mm respectively; the length, width and height of the outer conductor positioning plate are 41.00±0.01 mm, 41.00±0.01 mm and 10.00±0.01 mm respectively; the length, width and height of the upper pressing plate and the lower pressing plate are 22.50±0.01 mm, 10.00±0.01 mm and 2.00±0.01 mm respectively; The length, width and height of the briquetting punch are 22.50±0.01 mm, 10.00±0.01 mm and 50.00±0.01 mm respectively.