A clamping tool assembly suitable for SiC ceramic matrix composite sample piece

Abstract

The utility model relates to auxiliary tool fixture field, is a kind of clamping tool assembly suitable for SiC ceramic matrix composite sample piece.Set up on milling machine, clamping tool assembly includes positioning platform, positioning platform is placed horizontally and detachably installed on milling machine, positioning part is set on the upper surface of positioning platform, SiC ceramic matrix composite sample piece is set on positioning part, C type clamping piece is set on positioning platform and is fixed on the positioning part of SiC ceramic matrix composite sample piece, protective gasket is clamped between C type clamping piece and SiC ceramic matrix composite sample piece and positioning platform;It has improved the processing efficiency of SiC ceramic matrix composite sample piece, saved production cost;Clamping tool assembly is stable and reliable, and easy to assemble and disassemble, can avoid SiC ceramic matrix composite sample piece damage, ensure that clamping accuracy, meet the stringent requirements of high-end equipment field to SiC ceramic matrix composite sample piece preparation and testing link.

Description

Technical Field

[0001] This utility model relates to the field of auxiliary tooling fixtures, specifically a clamping tooling assembly suitable for SiC ceramic matrix composite material specimens. Background Technology

[0002] SiC ceramic matrix composites are highly favored in high-end equipment fields such as hot-end components of aero-engines and thermal protection systems of spacecraft due to their low density, excellent high-temperature stability and outstanding mechanical properties. In actual use, SiC ceramic matrix composite specimens generally need to undergo secondary processing to achieve precision forming, such as milling or grinding. However, the high hardness and brittleness, anisotropy and high cost of SiC ceramic matrix composites also bring processing challenges.

[0003] When using traditional clamps, such as three-jaw chucks and other general-purpose clamps, excessive radial clamping force often results in a breakage rate of over 60% for thin-walled SiC ceramic matrix composite specimens. The excessive weight of the all-mandrel clamping structure and the long assembly and disassembly time of 15-30 minutes per piece seriously affect the processing efficiency and quality of SiC ceramic matrix composite specimens.

[0004] Another method is adhesive fixation: it requires the use of high-temperature adhesives or structural adhesives, which not only increases the cost of chemical reagents, but also requires 2-4 hours for adhesive curing. Removing the adhesive requires high-temperature heating or chemical dissolution, which can easily damage the surface of the SiC ceramic matrix composite sample, resulting in low production efficiency. At the same time, the adhesive layer is prone to micro-slippage under processing vibration, which leads to deviations in the positioning accuracy of the SiC ceramic matrix composite sample and affects the processing quality.

[0005] In the preparation and mechanical property testing of SiC ceramic matrix composite specimens, specialized clamping equipment is required for rapid and stable clamping to ensure measurement accuracy and efficiency. However, traditional clamps are mostly specialized structures with poor adaptability, only compatible with specific milling machine models. They rely on direct metal-to-metal contact during clamping, which can easily cause chipping of the specimen edges. Furthermore, the fixed screw hole spacing cannot accommodate specimens with side lengths ranging from 20 to 100 mm, resulting in insufficient versatility. Consequently, in practical applications, there are defects such as uneven clamping, cumbersome operation, and slow clamping speed, which affect the production efficiency and testing accuracy of SiC ceramic matrix composite specimens.

[0006] Therefore, there is an urgent need for a clamping fixture assembly suitable for SiC ceramic matrix composite specimens to solve the above-mentioned technical problems. Utility Model Content

[0007] This invention aims to solve the above-mentioned problems, thereby providing a clamping fixture assembly suitable for SiC ceramic matrix composite specimens. This assembly not only improves the processing efficiency of SiC ceramic matrix composite specimens but also saves production costs. Furthermore, the clamping fixture assembly is stable, reliable, and easy to assemble and disassemble, which can prevent damage to the SiC ceramic matrix composite specimens and ensure the clamping accuracy of the SiC ceramic matrix composite specimens. This meets the stringent requirements of the high-end equipment field for the preparation and testing of SiC ceramic matrix composite specimens.

[0008] The technical solution adopted by this utility model to solve the aforementioned problem is:

[0009] A clamping fixture assembly for SiC ceramic matrix composite specimens is mounted on a milling machine. The clamping fixture assembly includes a positioning platform, which is horizontally placed and detachably mounted on the milling machine. A positioning part is provided on the upper surface of the positioning platform. The SiC ceramic matrix composite specimen is placed on the positioning part. A C-shaped clamping member is provided on the positioning platform to fix the SiC ceramic matrix composite specimen on the positioning part. Protective gaskets are clamped between the C-shaped clamping member, the SiC ceramic matrix composite specimen, and the positioning platform. The C-shaped clamping member includes an upper connecting plate and a lower connecting plate, which are spaced apart and parallel to each other. A vertical connecting plate is connected to one side of the upper and lower connecting plates. Fastening connectors are threadedly connected to both the upper and lower connecting plates, and the two fastening connectors abut against the two protective gaskets.

[0010] As a preferred embodiment, a further technical solution of this utility model is as follows:

[0011] Preferably, a notch is provided between the upper connecting plate, the vertical connecting plate and the lower connecting plate, the height of the notch is greater than the height of the positioning platform, and the positioning platform and the positioning part are both placed in the notch.

[0012] Preferably, the positioning platform is cuboid in shape and has several bolt holes, which penetrate vertically through the positioning platform and are arranged in a rectangular array on the positioning platform.

[0013] Preferably, the clamping fixture assembly further includes a long strip clamping member. The SiC ceramic matrix composite sample is placed on the upper surface of the positioning platform. The long strip clamping member is detachably installed on the positioning platform, and the long strip clamping member and the positioning platform together fix the SiC ceramic matrix composite sample. The long strip clamping member is connected to the bolt holes on the positioning platform, and a protective gasket is clamped between the long strip clamping member and the SiC ceramic matrix composite sample.

[0014] Preferably, several SiC ceramic matrix composite material specimens of different specifications are arranged on the upper surface of the positioning platform, and the length of the long strip clamping member varies with the specifications of the SiC ceramic matrix composite material specimens.

[0015] Preferably, the long strip clamping component includes a long strip clamping plate, with through holes at both ends of the long strip clamping plate. A connecting bolt is installed in each of the two through holes. The two connecting bolts are threadedly connected to the bolt holes on the positioning platform. The long strip clamping plate clamps and fixes the protective gasket and the SiC ceramic matrix composite sample to the upper surface of the positioning platform through the two connecting bolts.

[0016] Preferably, the lengths of both connecting bolts are less than the depth of the bolt holes on the positioning platform.

[0017] Preferably, the area of ​​the protective gaskets is smaller than the area of ​​the SiC ceramic matrix composite sample, and varies with the area of ​​the SiC ceramic matrix composite sample.

[0018] Preferably, the protective pad is in the form of a thin sheet and is made of rubber or silicone in one piece.

[0019] Compared with the prior art, the outstanding features of this utility model, which adopts the above technical solution, are:

[0020] This utility model's clamping fixture assembly not only improves the processing efficiency of SiC ceramic matrix composite specimens but also saves production costs. Furthermore, the clamping fixture assembly is stable, reliable, and easy to assemble and disassemble. It prevents damage to the SiC ceramic matrix composite specimens during clamping and fixing, while also ensuring the clamping accuracy, thus meeting the stringent requirements of high-end equipment in the preparation and testing of SiC ceramic matrix composite specimens. In addition, this utility model eliminates the need for adhesives, is highly efficient, and reduces the assembly and disassembly time of SiC ceramic matrix composite specimens. The protective gasket enhances the stability of SiC ceramic matrix composite specimens, thereby improving their machining accuracy. Furthermore, the protective gasket protects the specimens, preventing edge chipping or surface scratches during clamping. Not only does it eliminate the need for chemical reagents, but the clamping fixture is also reusable, resulting in low overall cost and economic efficiency. Moreover, the clamping fixture is compatible with most milling machines, offering a wide range of applications. It effectively prevents relative slippage between the clamping fixture and the SiC ceramic matrix composite specimen and is suitable for small to medium-sized thin sheet specimens. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the first embodiment of the present invention;

[0022] Figure 2 yes Figure 1 A schematic diagram of a partially enlarged structure;

[0023] Figure 3 This is a schematic diagram of the second embodiment of the present utility model;

[0024] In the figure: 1. Positioning platform; 2. SiC ceramic matrix composite sample; 3. C-shaped clamp; 4. Protective gasket; 5. Upper connecting plate; 6. Lower connecting plate; 7. Vertical connecting plate; 8. Fastening connector; 9. Notch; 10. Bolt hole; 11. Long strip clamping component; 12. Long strip clamping plate; 13. Connecting bolt. Detailed Implementation

[0025] The following description of the embodiments will help the public better understand the present invention. However, the specific embodiments provided by the applicant should not and should not be regarded as a limitation on the technical solution of the present invention. Any changes to the definition of components or technical features and / or formal but not substantive changes to the overall structure should be regarded as the scope of protection defined by the technical solution of the present invention.

[0026] See Figures 1 to 3 As shown, the technical solution of this utility model is as follows:

[0027] A clamping fixture assembly for SiC ceramic matrix composite specimens is mounted on a milling machine. The clamping fixture assembly includes a positioning platform 1, which is a rectangular parallelepiped made of steel or aluminum alloy and has dimensions of 208mm (length) × 148mm (width) × 50mm (height). The positioning platform 1 has 35 bolt holes 10 machined on it, all penetrating vertically. These 35 bolt holes 10 are arranged in a rectangular array on the positioning platform 1, with a center-to-center distance of 10mm and a depth of 30mm. The specifications, number, and arrangement of the bolt holes 10 can vary according to design requirements. The positioning platform 1 is horizontally placed and detachably mounted on the milling machine. A positioning part is provided on the upper surface of the positioning platform 1, and the SiC ceramic matrix composite specimen 2 is placed on the positioning part. The positioning platform 1 is equipped with a mechanism for holding the SiC ceramic matrix composite specimen 2. The SiC ceramic matrix composite specimen 2 is fixed to the positioning part by a C-shaped clamping member 3. Protective gaskets 4 are clamped between the C-shaped clamping member 3, the SiC ceramic matrix composite specimen 2, and the positioning platform 1. The C-shaped clamping member 3 is integrally formed of carbon steel and includes an upper connecting plate 5 and a lower connecting plate 6. The upper connecting plate 5 and the lower connecting plate 6 are spaced apart vertically and parallel to each other. A vertical connecting plate 7 is connected to one side of the upper connecting plate 5 and the lower connecting plate 6. Fastening connectors 8 are threadedly connected to both the upper connecting plate 5 and the lower connecting plate 6. Both fastening connectors 8 are M8×30mm hexagonal head grooved bolts. The two fastening connectors 8 are in contact with the two protective gaskets 4 respectively. A notch 9 is provided between the upper connecting plate 5, the vertical connecting plate 7, and the lower connecting plate 6. The height of the notch 9 is greater than the height of the positioning platform 1, and the positioning platform 1 and the positioning part are placed inside the notch 9.

[0028] The clamping fixture assembly also includes a long strip clamping member 11. The SiC ceramic matrix composite sample 2 is placed on the upper surface of the positioning platform 1. The long strip clamping member 11 is detachably installed on the positioning platform 1, and the long strip clamping member 11 and the positioning platform 1 together fix the SiC ceramic matrix composite sample 2. The long strip clamping member 11 is connected to the bolt hole 10 on the positioning platform 1, and a protective gasket 4 is clamped between the long strip clamping member 11 and the SiC ceramic matrix composite sample 2.

[0029] Several SiC ceramic matrix composite sample pieces 2 of different specifications are placed on the upper surface of the positioning platform 1. The length of the long strip clamping piece 11 varies with the specifications of the SiC ceramic matrix composite sample piece 2. The number and specifications of the SiC ceramic matrix composite sample piece 2 are determined according to the actual working conditions.

[0030] The long strip clamping component 11 includes a long strip clamping plate 12. Both ends of the long strip clamping plate 12 are machined with through holes. Connecting bolts 13 are installed in both through holes. The two connecting bolts 13 are threadedly connected to the bolt holes 10 on the positioning platform 1. The long strip clamping plate 12 clamps and fixes the protective gasket 4 and the SiC ceramic matrix composite sample 2 to the upper surface of the positioning platform 1 through the two connecting bolts 13. The length of the two connecting bolts 13 is less than the hole depth of the bolt holes 10 on the positioning platform 1.

[0031] The area of ​​the protective gasket 4 is smaller than that of the SiC ceramic matrix composite sample 2, and varies with the area of ​​the SiC ceramic matrix composite sample 2. The protective gasket 4 is in the form of a thin sheet with a thickness of 2 mm, and is integrally molded from rubber or silicone.

[0032] The first method of use: Fix the positioning platform 1 on the milling machine, ensuring that the upper surface of the positioning platform 1 is horizontal with an error ≤0.02mm / m; place the SiC ceramic matrix composite sample 2 on the positioning part, ensuring the vertical positioning of the SiC ceramic matrix composite sample 2; then, the C-type clamp 3, together with the two protective pads 4, fix the SiC ceramic matrix composite sample 2 on the positioning platform 1; after the SiC ceramic matrix composite sample 2 has been processed and tested, loosen the two fastening connectors 8 in the reverse direction and remove the SiC ceramic matrix composite sample 2.

[0033] The second method of use: Fix the positioning platform 1 on the milling machine, ensuring that the upper surface of the positioning platform 1 is horizontal with an error ≤0.02mm / m; place the SiC ceramic matrix composite sample 2 on the upper surface of the positioning platform 1, ensuring the lateral positioning of the SiC ceramic matrix composite sample 2; then, the long strip clamping piece 11, together with the protective gasket 4, fixes the SiC ceramic matrix composite sample 2 on the positioning platform 1; while fixing the long strip clamping piece 11, insert the two connecting bolts 13 into the bolt holes 10 and slowly tighten them until the protective gasket 4 is slightly deformed and the SiC ceramic matrix composite sample 2 is stable; after the SiC ceramic matrix composite sample 2 has been processed and tested, loosen the connecting bolts 13 in the opposite direction, and then remove the long strip clamping plate 12, the protective gasket 4, and the SiC ceramic matrix composite sample 2 in sequence; multiple SiC ceramic matrix composite sample 2s of different specifications can be fixed on the positioning platform 1 according to the actual working conditions.

[0034] This invention has the following advantages: High efficiency: No adhesive is required, and the assembly and disassembly time is reduced from several hours using traditional adhesive methods to within 30 seconds, increasing production efficiency by ≥90%; Stability: The coefficient of friction between the protective gasket 4 and the SiC ceramic matrix composite sample 2 is ≥0.6, and the sliding amount of the SiC ceramic matrix composite sample 2 is ≤0.01mm, improving the processing accuracy to ±0.02mm; Protection: The protective gasket 4 isolates the metal from the SiC ceramic matrix composite sample 2, preventing edge chipping or surface scratches caused by clamping; Economy: No chemical reagents are consumed, and the clamping tooling components can be reused ≥1000 times, reducing the overall cost by 60%.

[0035] This utility model's clamping fixture assembly not only improves the processing efficiency of SiC ceramic matrix composite sample 2 but also saves production costs. Furthermore, the clamping fixture assembly is stable, reliable, and easy to assemble and disassemble. It prevents damage to the SiC ceramic matrix composite sample 2 during clamping and fixing, while also ensuring the clamping accuracy, thus meeting the stringent requirements of high-end equipment fields for the preparation and testing of SiC ceramic matrix composite sample 2. In addition, this utility model eliminates the need for adhesives, is highly efficient, and reduces the assembly and disassembly time of the SiC ceramic matrix composite sample 2. Through ensuring… The protective pad 4 improves the stability of the SiC ceramic matrix composite specimen 2, thereby improving the processing accuracy of the SiC ceramic matrix composite specimen 2. In addition, the protective pad 4 protects the SiC ceramic matrix composite specimen 2, preventing edge chipping or surface scratches during clamping and fixing. Not only does it eliminate the need for chemical reagent consumption, but the clamping fixture assembly can also be reused, resulting in low overall cost and economic efficiency. Furthermore, the clamping fixture assembly is applicable to most milling machines, has a wide range of applications, effectively prevents relative sliding between the clamping fixture assembly and the SiC ceramic matrix composite specimen 2, and is suitable for small to medium-sized thin sheet specimens.

[0036] The above description is only a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent changes made based on the content of the present utility model specification and its drawings are included within the scope of the present utility model.

Claims

1. A clamping tool assembly suitable for SiC ceramic matrix composite specimen pieces, provided on a milling machine, characterized in that: The clamping fixture assembly includes a positioning platform, which is horizontally placed and detachably mounted on a milling machine. A positioning part is provided on the upper surface of the positioning platform. The SiC ceramic matrix composite sample is placed on the positioning part. A C-shaped clamping part is provided on the positioning platform to fix the SiC ceramic matrix composite sample on the positioning part. Protective gaskets are clamped between the C-shaped clamping part, the SiC ceramic matrix composite sample, and the positioning platform. The C-shaped clamping part includes an upper connecting plate and a lower connecting plate, which are spaced apart and parallel to each other. A vertical connecting plate is connected to one side of the upper and lower connecting plates. Fastening connectors are threaded onto both the upper and lower connecting plates, and the two fastening connectors abut against the two protective gaskets.

2. The clamping tool assembly suitable for SiC ceramic matrix composite coupon according to claim 1, characterized in that: A notch is provided between the upper connecting plate, the vertical connecting plate and the lower connecting plate. The height of the notch is greater than the height of the positioning platform, and the positioning platform and the positioning part are both placed inside the notch.

3. The clamping tool assembly suitable for SiC ceramic matrix composite coupon according to claim 1, characterized in that: The positioning platform is rectangular in shape and has several bolt holes. These bolt holes penetrate the positioning platform vertically and are arranged in a rectangular array on the platform.

4. The clamping tooling assembly suitable for SiC ceramic matrix composite coupon according to claim 3, characterized in that: The clamping fixture assembly also includes a long strip clamping component. The SiC ceramic matrix composite sample is placed on the upper surface of the positioning platform. The long strip clamping component is detachably installed on the positioning platform, and the long strip clamping component and the positioning platform together fix the SiC ceramic matrix composite sample. The long strip clamping component is connected to the bolt holes on the positioning platform, and a protective gasket is clamped between the long strip clamping component and the SiC ceramic matrix composite sample.

5. The clamping tooling assembly suitable for SiC ceramic matrix composite coupon according to claim 4, characterized in that: Several SiC ceramic matrix composite sample pieces of different specifications are set on the upper surface of the positioning platform. The length of the long strip clamping piece varies with the specifications of the SiC ceramic matrix composite sample pieces.

6. The clamping tooling assembly suitable for SiC ceramic matrix composite coupon according to claim 5, characterized in that: The long strip clamping component includes a long strip clamping plate, with through holes at both ends. Connecting bolts are installed in both through holes. The two connecting bolts are threadedly connected to the bolt holes on the positioning platform. The long strip clamping plate clamps and fixes the protective gasket and the SiC ceramic matrix composite sample to the upper surface of the positioning platform through the two connecting bolts.

7. The clamping tooling assembly suitable for SiC ceramic matrix composite coupon according to claim 6, characterized in that: The lengths of both connecting bolts are less than the depth of the bolt holes on the positioning platform.

8. The clamping tooling assembly suitable for SiC ceramic matrix composite coupon according to claim 7, characterized in that: The area of ​​the protective gaskets is smaller than that of the SiC ceramic matrix composite specimens, and varies with the area of ​​the SiC ceramic matrix composite specimens.

9. The clamping tooling assembly suitable for SiC ceramic matrix composite coupon according to claim 8, characterized in that: The protective pad is thin and is made of rubber or silicone in one piece.

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