A reinforcing cap bonding and curing device and method

Abstract

The present invention relates to a solid rocket engine manufacturing technology, and specifically to a reinforcing cap bonding and curing device and method. It includes a torque wrench, a square, a push rod, a push rod plane, a pressure cap, a clamp assembly, a clamp bracket, a base, a column and a cross bar. The column, the cross bar and the base constitute a tooling frame. A cross bar is arranged on the top of the column. The push rod is vertically fixed to the cross bar through a threaded connection. The top of the push rod is connected to a torque wrench through a square. The bottom of the push rod is provided with a push rod plane. The clamp assembly is fixed to the column through a clamp bracket; the pressure cap is placed in a groove above the pressure cap. The device can be quickly installed and disassembled and can test the applied pressure in real time. Multiple products can be bonded at one time; it can effectively solve the problems of bending and deformation of the drug column during the curing process; the identification rings at various parts of the device can ensure the coaxial press-fitting of the product.

Description

Technical Field

[0001] The present invention relates to a solid rocket engine manufacturing technology, and in particular to a reinforcement cap bonding and curing device and method. Background Art

[0002] During the design of a solid rocket motor, a reinforcement cap is bonded to the grain head using a special adhesive to prevent the grain head from piercing the fire and ensure proper fit with the shell. After applying the adhesive to the grain head and the inside of the reinforcement cap, the reinforcement cap is manually assembled to the grain head. Visually confirming that the bottom edge of the reinforcement cap is perpendicular to the grain, the gland is assembled and placed on top. A push rod is then used to contact the center of the gland cap, and pressure is applied manually based on experience before allowing it to cure.

[0003] When designing a small solid rocket engine, the grain and the shell are designed separately. It is necessary to glue a reinforcing cap to the head of the grain. After the reinforcing cap is glued, X-ray inspection is performed, and it is required that there is no missing material, no debonding, and no air holes. The reinforcing cap is made of hard material, and the head of the grain has been artificially shaped. The fit and matching between the reinforcing cap and the head of the grain are not good. The gluing process and the pressure application process during bonding are both manual operations. After bonding, the reinforcing cap is skewed, debonded, missing material, and air holes appear inside, and the bonding pass rate is only 40%. Therefore, the present invention proposes a solution that can solve the problems of real-time force measurement, anti-bending products, and coaxial press-fitting, and designs a bonding and curing device to achieve the goal of coaxial press-fitting and ensure that the product has no bending and no debonding.

[0004] The existing bonding process method cannot test the amount of force applied, so there is a possibility of insufficient or excessive force causing product damage; when pressure is applied after the reinforcing cap is assembled, since there is no unlimited position requirement for the placement of the drug column, the push rod cannot contact and squeeze the center of the pressure cap when pressure is applied, causing the reinforcing cap to be skewed and partially missing material after bonding. Summary of the Invention

[0005] Technical Problems to be Solved by the Invention

[0006] The present invention proposes a solution that can solve the problems of real-time force measurement, anti-bending products and coaxial press-fitting, and designs a bonding and curing device to solve the problems of insufficient or excessive force resulting in product damage due to the inability to test the magnitude of the applied force in the existing bonding process method; when pressure is applied after the reinforcing cap is assembled, due to the unlimited position requirements of the placement of the drug column, the push rod cannot contact and squeeze the center of the pressure cap during pressure application, resulting in the reinforcing cap being skewed after bonding and local material shortages.

[0007] Technical solutions adopted

[0008] A reinforcing cap bonding and curing device includes a torque wrench, a square, a push rod, a push rod plane, a pressure cover, a pressure cap, a clamp assembly, a clamp bracket, a base, a column and a cross bar. The column, cross bar and base constitute a tooling frame. A cross bar is provided on the top of the column. The push rod is vertically fixed to the cross bar through a threaded connection. The top end of the push rod is connected to the torque wrench through a square, the bottom end of the push rod is provided with a push rod plane, and the clamp assembly is fixed to the column through a clamp bracket; the pressure cover is placed in a groove above the pressure cap.

[0009] Furthermore, two fixed wheels and two universal wheels with brakes are installed at the bottom of the device base.

[0010] Furthermore, clamp brackets are provided at the lower and upper middle parts of the column to fix different types of medicine columns.

[0011] A reinforcing cap bonding and curing method comprises the following steps:

[0012] S1: Assemble the reinforcement cap to the head of the grain, and draw a circular mark on the outer surface of the grain along the bottom edge of the reinforcement cap, making sure the circular mark is perpendicular to the grain;

[0013] S2: Place the grain head upwards in the marking circle on the bottom plate of the device, with the middle of the grain close to the inner arc surface of the clamp;

[0014] S3: Apply adhesive to the reinforcing cap and assemble it to the head of the grain column. Assemble the pressure cap and place the pressure cover on top of the pressure cap. The pressure cover must be placed in the pressure cap groove.

[0015] S4: Turn the torque wrench on the tooling to apply pressure so that the plane of the push rod contacts the upper end face of the gland. The pressure test ensures that the bottom edge of the reinforcing cap fits completely with the annular identification ring on the outer surface of the drug column.

[0016] Furthermore, small holes of Φ1 are respectively opened on both sides of the gland portion of S3.

[0017] Furthermore, the thickness of the adhesive applied to the reinforcing cap in S3 is about 1.5-2 mm.

[0018] Beneficial effects

[0019] The device can be quickly installed and disassembled and can test the applied pressure in real time, and can bond multiple products at a time; the device is equipped with a clamp to ensure that other components do not affect the external force of the drug column during product placement, effectively solving problems such as bending and deformation of the drug column during the curing process; the side exhaust holes of the pressure cover can effectively prevent the formation of a sealing area between the pressure cover and the pressure cap, resulting in upward pressure and debonding of the top of the reinforcing cap. The identification rings on various parts of the device can ensure the coaxial press-fit of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 : Schematic diagram of the reinforcement cap bonding and curing device;

[0021] Figure 2 : Schematic diagram of the clamp assembly;

[0022] Figure 3 : Schematic diagram of the pressure cap assembly;

[0023] Among them: 1- torque wrench; 2- square falcon; 3- push rod plane; 4- clamp bracket; 5- clamp assembly; 6- pressure cover; 7- pressure cap. DETAILED DESCRIPTION

[0024] The present invention is a specially designed reinforcing cap bonding and curing device, with placement position marks engraved on the tooling base, holes opened on both sides of the pressure cap, grooves engraved on the top of the pressure cap, the pressure cover cooperates with the grooves, and the top of the pressure cover is engraved with engraved lines that cooperate with the push rod pressure piece, which can achieve vertical pressure to ensure that the reinforcing cap is qualified after bonding.

[0025] The specific technical solutions adopted in the present invention are as follows:

[0026] The tooling as a whole is a reinforcement cap bonding and curing device. The tooling is connected to the base and four columns. The bottom of the base is equipped with two fixed wheels and two universal wheels with brakes, which can move, turn 360 degrees, and brake at any time. Two sets of support plates with clamps are installed in the middle of the column. After the product is placed vertically on the base, the lower and upper middle parts of the product are fixed with clamps. The clamps are set as a quick-install and quick-disassemble structure. After the clamps are fixed, glue is applied to the product head and the inner surface of the reinforcement cap, and the reinforcement cap is manually installed to the product head. A pressure cap is installed on top of the reinforcement cap, and a pressure cover is installed in the groove on the top of the pressure cap. Then, the handle of the push rod is turned to make the push rod flat contact the upper surface of the pressure cover. The torque wrench contacts the upper side of the push rod to achieve vertical pressure fixation of the reinforcement cap and maintain pressure for curing.

[0027] The basic steps of the device of the present invention are: 1) In order to meet the goal of multiple shots at one time and in line with the goal of saving space, the device is designed as a back-to-back structure to fully save space; 2) The product placement logo is engraved on the bottom of the device, and two holes are opened on the side of the pressure cap. A hole is designed on the top of the pressure cap, and a groove is designed to cooperate with the push rod; 3) A square falcon is designed on the upper end of the push rod to cooperate with the torque wrench. The square falcon and the torque wrench can be used to test the applied pressure value in real time; 4) A circle mark is drawn on the vertical part of the bottom edge of the reinforcement cap and the grain to ensure that the bottom edge of the reinforcement cap is fully fitted and aligned with the circle mark after assembly; 5) Two sets of clamp assemblies are designed in the middle of the grain to effectively prevent the grain from bending during the pressure application process.

[0028] A method for bonding and curing a reinforcement cap comprises the following steps: S1: assembling the reinforcement cap to the head of a drug column, drawing a circular mark on the outer surface of the drug column along the bottom edge of the reinforcement cap, and ensuring that the circular mark ring is perpendicular to the drug column; S2: placing the drug column head upward in the mark ring on the bottom plate of the device, with the middle of the drug column close to the inner arc surface of the clamp; S3: applying adhesive to the reinforcement cap and assembling it to the head of the drug column, assembling the pressure cap, and placing a pressure cover on top of the pressure cap, which must be placed in the pressure cap groove; S4: rotating the torque wrench on the top of the tooling to apply pressure so that the plane of the push rod contacts the upper end face of the pressure cover, and testing the applied pressure to ensure that the bottom edge of the reinforcement cap is completely in contact with the circular mark ring on the outer surface of the drug column. A small hole of Φ1 is opened on both sides of the pressure cover portion of S3. The thickness of the adhesive applied to the reinforcement cap in S3 is approximately 1.5-2 mm.

[0029] In order to make the purpose, features and advantages of the technical solution proposed by the present invention more obvious and easy to understand, the following will be combined with the attached Figure 1-3 , clearly and completely describing the embodiments of the technical solution proposed by the present invention. Obviously, the described embodiments are only some embodiments of the proposed technical solution, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] The product design requires bonding a rigid reinforcement cap to the head of the cylindrical body. The cylindrical head is manually trimmed and shaped, and the bottom edge of the cap must be perpendicular to the grain axis after bonding. The cap must be free of missing material, debonding, or air holes, and the grain must not bend or deform during the bonding process. The adhesive used is a specially formulated, viscous liquid with a certain degree of fluidity.

[0031] The device consists of a torque wrench, a square hammer, a push rod, a push rod plane, a pressure cover, a pressure cap, a clamp assembly, a clamp bracket, a base and casters. When bonding and pressing, the product is placed in a vertical position with the head facing upward.

[0032] The method of using the device is as follows: first assemble the reinforcing cap to the head of the medicine column, draw a circular mark on the outer surface of the medicine column along the bottom edge of the reinforcing cap, ensure that the circular mark circle is perpendicular to the medicine column, and place the medicine column head upward in the mark circle on the bottom plate of the device, with the middle of the medicine column close to the inner arc surface of the clamp, apply adhesive to the reinforcing cap and assemble it to the head of the medicine column, assemble the pressure cap, place the pressure cover on the pressure cap, and the pressure cover must be placed in the pressure cap groove, turn the torque wrench on the top of the device so that the plane of the push rod contacts the upper end face of the pressure cover, check that the plane of the push rod is completely aligned with the mark circle on the pressure cover after contact, and continue to turn the torque wrench to apply pressure to test the pressure (the specific structure of the device is shown in the figure). Figure 1 ) to ensure that the bottom edge of the reinforcing cap fits completely with the annular identification ring on the outer surface of the grain.

[0033] This device can be used to bond reinforcing caps for a series of similar structural products. It has several innovative features that help ensure bonding quality and consistency, as shown below:

[0034] 1) Ensure press-fit coaxiality. By marking an identification ring on the bottom plate of the device and the upper end surface of the gland, and leaving a groove on the gland, the press-fit device is machined to ensure coaxiality with the identification ring and groove. During operation, the operator only needs to place the product and components in the required position to ensure coaxiality. This method is easy to operate.

[0035] 2) Anti-bending design. Anti-bending shields are designed at two heights on the device's columns. The contact points between the shields and the product are clamp-type, with a quick-opening and closing pin lock that operates within 3 seconds. The columns are drilled at different locations, and the height of the shields can be adjusted according to the height of the product.

[0036] 3) Gland vent design. After statistically analyzing previous debonding issues, it was determined that debonding was partially caused by increased pressure inside the gland and gland after press-fitting, creating a pressure differential with the atmospheric pressure outside, which affected the transmission of applied pressure. Small Φ1 holes were opened on either side of the gland to ensure balanced internal and external pressure after pressure was applied, effectively ensuring force transmission.

[0037] 4) Versatile Design. The device features universal design for the top rod, clamp, and baseplate identification ring. Products of varying lengths can be press-fitted by raising and lowering the top cover. The clamp on the guard plate features a quick-disassembly mechanism. When press-fitting large-diameter products, the clamp is simply removed, and when pressing smaller diameter products, a smaller clamp is simply replaced. The identification ring can be scaled relative to the same center when press-fitting products of varying diameters.

[0038] 5) Realize the test of applied torque. The outermost side of the top cover is designed as a square structure, which is matched with the torque wrench to realize the test of applied torque at any time, prevent excessive pressure from causing irreversible deformation of the product, and improve product quality.

[0039] By applying this device, the first-time qualified rate of drug column bonding is increased to 100%.

Claims

1. A curing method for a reinforcing cap bonding and curing device, the bonding and curing device comprising a torque wrench, a square, a push rod, a push rod plane, a pressure cap, a pressure cap, a clamp assembly, a clamp bracket, a base, a column and a cross bar, the column, the cross bar and the base constitute a tooling frame, a cross bar is arranged on the top of the column, the push rod is vertically fixed to the cross bar by a threaded connection, the top of the push rod is connected to a torque wrench by a square, the bottom of the push rod is provided with a push rod plane, the clamp assembly is fixed to the column by a clamp bracket; the pressure cap is placed in a groove above the pressure cap, It is characterized in that The steps include: S1: Assemble the reinforcing cap to the head of the medicine column, and draw a circular mark on the outer surface of the medicine column along the bottom edge of the reinforcing cap, making sure that the circular mark circle is perpendicular to the medicine column; S2: Place the head of the drug column upward in the marking circle on the bottom plate of the device, with the middle of the drug column close to the inner arc surface of the clamp; S3: Apply adhesive to the reinforcing cap and assemble it to the head of the medicine column, assemble the pressure cap, and place a pressure cover on the pressure cap. The pressure cover must be placed in the pressure cap groove, and small holes of φ1 are opened on both sides of the pressure cover. S4: Turn the torque wrench on the top of the tooling to apply pressure so that the plane of the push rod contacts the upper end surface of the pressure cap. The pressure test ensures that the bottom edge of the reinforcing cap is completely in contact with the annular identification ring on the outer surface of the drug column.

2. The curing method of the reinforcing cap bonding and curing device according to claim 1, characterized in that: The bottom of the base is equipped with two fixed wheels and two universal wheels with brakes.

3. The curing method of the reinforcing cap bonding and curing device according to claim 1, characterized in that: Clamp brackets are arranged at the middle lower part and the middle upper part of the column to fix different types of medicine columns.

4. The curing method of the reinforcing cap bonding and curing device according to claim 1, characterized in that: The thickness of the adhesive applied to the reinforcing cap in S3 is 1.5-2 mm.

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