Matched mould pressing tool for manufacturing test piece for testing pull-off performance

Abstract

The invention relates to a matched mould pressing tool for a test piece for a tear-off performance test. The matched mould pressing tool comprises a top frame, a bottom frame, a mould positioning hole, a mould positioning pin, a heat insulation layer limiting frame, the test piece, a demoulding hole, a lifting handle, a test piece positioning hole, a test piece positioning pin and a glue overflowing groove. The top frame and the bottom frame are provided with grooves matched with a test piece and are oppositely arranged up and down, and the heat insulation layer limiting frames are selected according to a bonding interface required to be tested. The all-directional positioning of the test pieces ensures that the center lines of the upper and lower test pieces in the loading force direction are consistent, and the coaxiality of the upper and lower test pieces is ensured through the positioning pin. According to the invention, the problem of local dislocation of the test piece caused by non-uniform force application of manual operation is solved, the quality of the manufactured test piece and the accuracy of test data are improved, and a plurality of groups of pull-away test pieces can be manufactured at one time. The invention provides a method for manufacturing a pull-away test piece, which is more convenient and quicker, ensures the quality and efficiency, and is more accurate in expression of the bonding strength of a related interface of a heat insulating layer.

Description

Technical Field

[0001] The invention relates to the field of solid rocket engine interface bonding performance testing, and in particular to a matching molding tool for producing a tear-off performance test piece. Background Art

[0002] The bonding strength of the insulation layer related interfaces is one of the important evaluation indicators of the insulation layer. The tear-off strength of the tear-off specimen can indirectly characterize the bonding strength of the insulation layer related interfaces in the combustion chamber of the solid rocket engine. In addition to factors such as adhesives, vulcanization temperature, and vulcanization pressure, the bonding process has a great influence on the bonding strength between the insulation layer related interfaces. The production of the test specimens for the tear-off performance of the bonding interface is generally done manually. Manual production has the problems of cumbersome operation, time-consuming and labor-intensive, uncontrollable pressure, and local misalignment of the specimens, which makes it difficult to ensure the bonding quality of the specimens, thereby affecting the test results and failing to accurately evaluate the interface bonding performance. Summary of the invention

[0003] Based on the above technical problems, the present invention provides a matching molding tool for the production of tear-off performance test specimens to solve the problem that the existing production of tear-off performance test specimens for bonding interfaces generally adopts manual operation, and the manual production has the problems of cumbersome operation, time-consuming and labor-intensive, uncontrollable pressure, and local misalignment of specimens.

[0004] In order to solve the above technical problems, one of the purposes of the present invention is to provide a matching molding tool for making a tear-off performance test specimen, including a top frame 1, a bottom frame 2, a mold positioning hole 3, a mold positioning pin 4, an insulation layer limit frame 5, a specimen 6, a demoulding hole 7, a handle 8, a specimen positioning hole 9, a specimen positioning pin 10, a specimen bottom plate 12, a specimen tail bolt 13 and a specimen ingot pin hole 14, wherein the top frame 1 and the bottom frame 2 are placed opposite to each other, and the insulation layer limit frame 5 is placed in the middle of the top frame and the bottom frame; the top frame 1 and the bottom frame 2 are respectively provided with grooves matching the size of the circular tear-off specimen 6, and the grooves are The top frame 1 and the bottom frame 2 are arranged evenly; mold positioning holes 3 are provided on both sides of the top frame 1 and the insulation layer limit frame 5; mold positioning pins 4 are provided on both sides of the bottom frame 2; demoulding holes 7 and handles 8 are provided on the sides of the top frame 1 and the bottom frame 2; specimen positioning holes 9 are provided at the bottom of the top frame 1 and the bottom frame 2; overflow glue grooves 11 along the horizontal and vertical directions are provided on the top frame 1 and the bottom frame 2; the specimen 6 is composed of a specimen bottom plate 12 and a specimen tail bolt 13, and a specimen ingot pin hole 14 is provided on the specimen tail bolt. The upper and lower specimens are exactly the same and are placed opposite to each other, and their shapes match the grooves of the upper and lower molds.

[0005] Furthermore, the positioning holes 3 on the top frame 1 and the insulation layer limiting frame 5 and the positioning pins 4 on the bottom frame 2 are in a one-to-one correspondence.

[0006] Furthermore, when the upper and lower specimens are placed, the specimen ingot positioning pin hole 14 on the specimen tail bolt 13 is aligned with the specimen positioning hole 9 on the mold, and the specimen positioning pin 10 is inserted to ensure that the upper and lower specimens maintain coaxiality.

[0007] Furthermore, the thickness of the top frame 1 and the bottom frame 2 is the same as that of the specimen 6, so that the specimen is completely embedded in the groove in the mold, and the upper surfaces of the upper and lower specimen bottom plates are respectively flush with the surfaces of the top frame and the bottom frame, so that the specimen in the mold is evenly stressed after being pressurized by the flat vulcanizer.

[0008] Furthermore, 20 grooves matching the test pieces are provided in the top frame 1 and the bottom frame 2, and the aperture of the grooves is slightly larger than the diameter of the circular tear-off test piece 6, so as to facilitate demoulding and removal after vulcanization and pressurization.

[0009] Furthermore, a plurality of overflow glue grooves 11 are provided near the grooves of the top frame 1 and the bottom frame 2 in the horizontal and vertical directions, with a width of 2 mm and a depth of 1 mm, so as to allow excess glue to overflow, thereby ensuring that the thickness of the insulation layer of each group of specimens is consistent and facilitating subsequent demoulding.

[0010] Furthermore, four demoulding holes 7 are opened on the sides of the top frame 1 and the bottom frame 2, and there are threads in the demoulding holes 7. The top frame 1, the insulation layer limit frame 5 and the bottom frame 2 are separated by relative rotation of the nut and the thread to remove the thread, so that the test piece can be demoulded from the mold conveniently after pressurized vulcanization.

[0011] Furthermore, a release layer needs to be sprayed on the surfaces of the top frame 1 and the bottom frame 2.

[0012] Furthermore, the diameter of the bottom plate 9 of the test piece 6 is 25±0.05 mm, and the thickness is 5 mm; the diameter of the test piece tail plug 10 is 7 mm to 11 mm, and the height of the tail plug is 25 mm.

[0013] Furthermore, the thickness of the insulation layer limiting frame 5 is 2 mm-6 mm, which is selected according to the bonding interface to be tested.

[0014] The above one or more technical solutions of the present invention have at least one or more of the following technical effects:

[0015] The present invention aims at accurately evaluating the interfacial bonding strength of the thermal insulation layer, and provides a matching mold pressing tool for producing a tear-off performance test specimen to improve the efficiency and quality of producing the specimen and the accuracy of the test data;

[0016] The mold of the present invention has a simple structure, is easy to install and disassemble, and effectively saves the time and cost of test piece production;

[0017] The mold of the present invention can control the pressure applied to the test piece, ensure that the center lines of the upper and lower test pieces in the direction of the loading force are consistent to avoid local dislocation of the test pieces, and ensure the coaxiality of the upper and lower test pieces, effectively improve the test piece production yield, improve the accuracy of the test data, and more accurately express the interface bonding performance related to the insulation layer;

[0018] The mold of the present invention can produce multiple groups of test pieces at one time, effectively improving the production efficiency of the test pieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 : Schematic diagram of the molding tool structure of the present invention;

[0020] Figure 2 : Schematic diagram of the top frame structure of the molded tooling of the present invention;

[0021] Figure 3 : Schematic diagram of the structure of the test piece used in this utility;

[0022] Figure 4 : A schematic structural diagram of the thermal insulation layer limiting frame of the present invention.

[0023] In the figure: 1-top frame, 2-bottom frame, 3-mold positioning hole, 4-mold positioning pin, 5-insulation layer limiting frame, 6-test piece, 7-demolding hole, 8-handle, 9-test piece positioning hole, 10-test piece positioning pin, 11-overflow glue groove, 12-test piece bottom plate, 13-test piece tail bolt, 14-test piece ingot pin hole. Specific implementation plan

[0024] The present invention discloses a matching mold pressing tool for making a test specimen for testing the adhesion and tearing performance of the interface of the thermal insulation layer. The mold is easy to use and has a simple structure. The center lines of the upper and lower test specimens in the direction of the loading force are ensured to be consistent through the all-round positioning of the test specimens, and the coaxiality of the upper and lower test specimens is ensured through the positioning pins. The method can make multiple groups of tearing test specimens at a time, effectively saving the man-hour cost of test specimen production; at the same time, it solves the problem of measurement result error caused by the uneven force application in manual operation, resulting in local dislocation of the test specimen, improves the quality of the test specimens and the accuracy of the test data, and more accurately expresses the adhesion performance of the interface related to the thermal insulation layer.

[0025] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in combination with the embodiments of the present invention and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the obtained embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0026] See also Figures 1 to 4As shown, the present invention includes a top frame 1, a bottom frame 2, a mold positioning hole 3, a mold positioning pin 4, an insulation layer limit frame 5, a test piece 6, a demoulding hole 7, a handle 8, a test piece positioning hole 9, a test piece positioning pin 10, a glue overflow groove 11, a test piece bottom plate 12, a test piece tail bolt 13, and a test piece ingot pin hole 14.

[0027] See also Figure 1 and 2 The top frame 1 and the bottom frame 2 are placed opposite to each other, and the demoulding layer is sprayed on the inner and outer surfaces. The top frame and the bottom frame are respectively provided with grooves matching the size of the circular tear-off specimen 6, and the grooves are evenly arranged. Mold positioning holes 3 are provided on both sides of the top frame 1 and the insulation layer limit frame 5. Mold positioning pins 4 are provided on both sides of the bottom frame. The mold positioning holes 3 and the mold positioning pins 4 are in a one-to-one correspondence to ensure that the upper and lower specimens are fully positioned. Demolding holes 7 and handles 8 are provided on the sides of the top frame and the bottom frame, and specimen positioning holes 9 are provided at the bottom of the top frame and the bottom frame. The coaxiality of the upper and lower specimens is ensured by inserting the specimen positioning pins 10. The top frame and the bottom frame are provided with overflow glue grooves 11 in the horizontal and vertical directions;

[0028] See also Figure 3 As shown, the test piece 6 is composed of a test piece bottom plate 12 and a test piece tail bolt 13, and a test piece ingot position pin hole 14 is opened on the tail bolt. The upper and lower test pieces are exactly the same and are placed opposite to each other. The outer shape matches the grooves of the upper and lower molds. When the test piece is placed, the test piece ingot position pin hole 14 on the test piece tail bolt 13 is aligned with the test piece positioning hole 9 on the mold, and then the test piece positioning pin 10 is inserted to ensure that the upper and lower test pieces maintain coaxiality;

[0029] The thickness of the insulation layer limiting frame 5 has two specifications, which can be selected according to the bonding interface to be tested;

[0030] The thickness of the top frame 1 and the bottom frame 2 is the same as that of the test piece 6, so that the test piece is completely embedded in the groove in the mold, ensuring that the upper surfaces of the bottom plates of the upper and lower test pieces are flush with the surfaces of the top frame and the bottom frame respectively, so that the test piece in the mold is evenly stressed after being pressed by the flat vulcanizer;

[0031] The top frame 1 and the bottom frame 2 are provided with 20 grooves that match the test piece, and the aperture of the grooves is slightly larger than the diameter of the circular tear-off test piece 6, so as to facilitate demoulding and removal after vulcanization and pressurization;

[0032] The sides of the top frame 1 and the bottom frame 2 are provided with demoulding holes 7 to facilitate demoulding and removal after pressurized vulcanization;

[0033] The diameter of the test piece bottom plate 12 is 25 mm and the thickness is 5 mm;

[0034] The diameter of the test piece tail plug 13 is 7 mm, and the height of the tail plug is 25 mm;

[0035] The thickness of the heat insulation layer limiting frame 5 is 2 mm-6 mm, which is selected according to the bonding interface to be tested.

[0036] The preparation process of the tear-off performance test specimen is as follows:

[0037] First, cut the raw rubber of the insulation layer into the size of the tear-off specimen, and polish and clean the surface of the metal tear-off specimen. Then, apply adhesive to the surface of the specimen and the surface of the raw rubber of the insulation layer for bonding. After bonding, place the specimen that is well bonded to the insulation layer into the groove of the lower mold, ensuring that the specimen ingot pin hole on the specimen tail bolt is aligned with the specimen positioning hole on the mold, and insert the positioning holes on the insulation layer limit frame and the positioning holes of the upper mold into the positioning pins on the lower mold respectively to ensure that the upper and lower specimens are aligned in all directions. Finally, insert the specimen positioning pin into the specimen positioning hole, and pressurize and vulcanize under the action of a flat vulcanizer. The temperature and pressure are selected according to the specific requirements of the specimen. After vulcanization is completed, demold directly for testing.

[0038] According to the test results, it is found that the data between the various sub-samples of the tear-off specimens made using this embodiment have a good balance, the tear-off strength is greater than that of the handmade specimens, and the bonding quality of the specimens is better. The specimens made using this mold provide effective data for the evaluation of the interface bonding performance of the insulation layer, and more accurately express the bonding performance between the shell and the insulation layer of the solid rocket engine.

[0039] The mold has a simple structure, is convenient and fast, and can produce multiple sets of tear-off specimens at a time. Compared with manually made specimens, it saves more manpower and material resources. In addition, the mold inserts the locating pins of the bottom plate through the locating holes of the top frame and the insulation layer limit frame to achieve all-round positioning of the specimen. Pressure is applied through a flat vulcanizer to avoid dislocation of the specimen due to uneven force, reduce the discreteness of each sub-sample test data, and improve the accuracy of the test data.

[0040] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A matching molding tool for producing a tear-off performance test specimen, characterized in that: The invention comprises a top frame (1), a bottom frame (2), a mold positioning hole (3), a mold positioning pin (4), an insulation layer limiting frame (5), a test piece (6), a demoulding hole (7), a handle (8), a test piece positioning hole (9), a test piece positioning pin (10), a glue overflow groove (11), a test piece bottom plate (12), a test piece tail bolt (13) and a test piece ingot positioning pin hole (14), wherein the top frame (1) and the bottom frame (2) are arranged opposite to each other, and the insulation layer limiting frame (5) is arranged between the top frame and the bottom frame; the top frame (1) and the bottom frame (2) are respectively provided with grooves matching the size of the circular tear-off test piece (6), and the grooves are evenly arranged; both sides of the top frame (1) and the insulation layer are provided with grooves matching the size of the circular tear-off test piece (6). Mold positioning holes (3) are provided on both sides of the heat layer limit frame (5); mold positioning pins (4) are provided on both sides of the bottom frame (2); demoulding holes (7) and handles (8) are provided on the sides of the top frame (1) and the bottom frame (2); test piece positioning holes (9) are provided on the bottoms of the top frame (1) and the bottom frame (2); glue overflow grooves (11) are provided in the horizontal and vertical directions on the top frame (1) and the bottom frame (2); the test piece (6) is composed of a test piece bottom plate (12) and a test piece tail bolt (13); a test piece ingot pin hole (14) is provided on the test piece tail bolt; the upper and lower test pieces are completely identical, placed opposite to each other, and their shapes match the grooves of the upper and lower molds.

2. The matching molding tool for making the tear-off performance test specimen according to claim 1 is characterized in that: The positioning holes (3) on the top frame (1) and the heat-insulating layer limiting frame (5) and the positioning pins (4) on the bottom frame (2) are in a one-to-one correspondence.

3. The matching molding tool for making the tear-off performance test specimen according to claim 1 is characterized in that: When placing the upper and lower test pieces, the test piece ingot pin hole (14) on the test piece tail bolt (13) is aligned with the test piece positioning hole (9) on the mold, and the test piece positioning pin (10) is inserted to ensure that the upper and lower test pieces maintain coaxiality.

4. The matching molding tool for making the tear-off performance test specimen according to claim 1 is characterized in that: The thickness of the top frame (1) and the bottom frame (2) is the same as the thickness of the test piece (6), so that the test piece is completely embedded in the groove in the mold, and the upper surfaces of the upper and lower test piece bottom plates are respectively flush with the surfaces of the top frame and the bottom frame, so that the test piece in the mold is evenly stressed after being pressed by the flat vulcanizer.

5. The matching molding tool for making the tear-off performance test specimen according to claim 4 is characterized in that: The top frame (1) and the bottom frame (2) are provided with 20 grooves matching the test pieces, and the apertures of the grooves are slightly larger than the diameter of the circular tear-off test piece (6), so as to facilitate demoulding and removal after vulcanization and pressurization.

6. The matching molding tool for making the tear-off performance test specimen according to claim 5, characterized in that: A plurality of overflow glue grooves (11) are provided in the horizontal and vertical directions near the grooves of the top frame (1) and the bottom frame (2). The overflow glue grooves (11) are 2 mm wide and 1 mm deep to allow excess glue to overflow, thereby ensuring that the thickness of the insulation layer of each group of test pieces is consistent and facilitating subsequent demoulding.

7. The matching molding tool for making the tear-off performance test specimen according to claim 1 is characterized in that: Four demoulding holes (7) are provided on the sides of the top frame (1) and the bottom frame (2), and threads are provided in the demoulding holes (7). The top frame (1), the insulation layer limiting frame (5) and the bottom frame (2) are separated by rotating the nuts relative to the threads to release the threads, so that the test piece can be demoulded from the mold after pressure vulcanization.

8. The matching molding tool for making the tear-off performance test specimen according to claim 1, characterized in that: The inner and outer surfaces of the top frame (1) and the bottom frame (2) need to be sprayed with a demoulding layer.

9. The matching molding tool for producing the tear-off performance test specimen according to claim 1, characterized in that: The diameter of the specimen bottom plate (12) is 25±0.05 mm, and the thickness is 5 mm; the diameter of the specimen tail plug (13) is 7 mm to 11 mm, and the height of the specimen tail plug is 25 mm.

10. The matching molding tool for producing the tear-off performance test specimen according to claim 1, characterized in that: The thickness of the heat insulation layer limiting frame (5) is 2 mm to 6 mm, and is selected according to the bonding interface to be tested.

Images