Flexible joint integrated bonding forming tool design method and tool using method

Abstract

The present application relates to the technical field of manufacturing flexible joint of oscillating nozzle of solid rocket engine, and discloses a kind of integrated bonding forming tool design method of flexible joint, comprising the following steps: determining the assembly relationship between each part;According to the assembly relationship, determine the critical position;Sealing environment design of mould is carried out;Determine the die closing qualified index;According to the critical position and die closing qualified index, process analysis is carried out in the sealing environment, so as to carry out the die structure design, and the specific structure of the lower die, the upper die, the insert and the inner support ring is obtained.The present application also discloses a kind of tool using method.The flexible joint integrated bonding forming tool design method and tool using method of the present application have the advantages of no step-by-step bonding die pressing link, no external cooperation process, reduced types of required adhesive, shortened production cycle, further improved bonding strength and shape size precision.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of manufacturing technology of flexible joint of oscillating nozzle of solid rocket engine, in particular to a design method and using method of integrated bonding forming tooling of flexible joint. BACKGROUND

[0002] The nozzle of solid rocket engine is divided into fixed nozzle and oscillating nozzle according to the requirement of thrust vector control. The flexible oscillating nozzle connects the fixed body and movable body through the flexible joint, the fixed body is connected with the combustion chamber, then the movable body is driven by the servo actuator to make the flexible joint deflect, so as to adjust the angle between the expansion section on the movable body and the engine axis, and the high-temperature, high-pressure and high-speed gas is sprayed from the opening end of the expansion section at the preset angle, so as to realize the attitude and orbit control of the engine in the directions of pitch, yaw and roll under the reverse thrust of the gas. Therefore, the manufacturing quality and production cycle of the flexible joint are very important links in the development and production of the oscillating nozzle.

[0003] At present, the flexible joint generally adopts the step-by-step forming method which is relatively mature in forming technology, that is, the fixed rear joint, the reinforcing part and part of the rubber elastic body are interlaced and stacked on the A tooling for bonding and die forming, then a series of surface treatments (the surface rubber of the assembly needs to be treated by concentrated sulfuric acid, and the metal part needs to be treated by spraying) are performed on the assembly and the movable conical body, the adhesive is applied, and then the die forming is performed on the B tooling. The step-by-step forming method needs to use two sets of tooling and two types of adhesives (because the vulcanization and aging of the rubber elastic body are different, the required adhesives are different), and has the disadvantages of many processes, long cycle, complex operation, and easy to exceed the shape, size and dimension.

[0004] The purpose of the present application is to provide a design method and using method of integrated bonding forming tooling of flexible joint, which has the advantages of no step-by-step bonding and die forming, no external cooperation process, reduced types of required adhesives, shortened production cycle, and further improved bonding strength and shape and size precision.

[0005] To achieve the above purpose, the design method of integrated bonding forming tooling of flexible joint designed by the present application comprises the following steps:

[0006] A) determining the assembly relationship between the parts;

[0007] B) determining the key position according to the assembly relationship determined in step A);

[0008] C) designing the sealing environment of the mold, which can ensure that the molten rubber fully fills the interface gap of the metal part when the pressure is applied during the die forming;

[0009] D) determining the closing qualification index;

[0010] E) According to the key position and the mold closing qualified index, process analysis is carried out in the sealing environment determined in the step C), so as to carry out the mold opening structure design, and the specific structures of the lower mold, the upper mold, the insert and the inner support ring are obtained, wherein:

[0011] The structure design of the lower mold comprises that the outer cylindrical surface of the lower mold is designed as a positioning surface of the inner cylindrical surface of the fixed rear joint, that is, the size of the fixed rear joint in the XOY plane is limited to ensure the consistency of the coaxiality quality with the movable inverted cone, and that the taper angle of the outer conical surface of the lower mold is a high-precision important dimension, which cooperates with the conical surface of the insert to jointly control the position accuracy of the reinforcing part. The large circular end surface of the lower mold is in a fitted state with the large circular end surface of the upper mold in the mold testing process, and the gap therebetween is less than 0.02 mm, which is used to judge whether each metal part is assembled in place or to judge whether the shape, position and size of each metal part are out of tolerance.

[0012] The structure design of the upper mold comprises that the movable inverted cone is fixed by the upper mold and the insert, the gap between the inner conical surface of the upper mold and the outer conical surface of the movable inverted cone is less than 0.05 mm, the small head end surface of the upper mold is fitted with the movable inverted cone, and the step of the upper mold is higher than the large head end of the movable inverted cone, so that no interference occurs in the mold closing process.

[0013] The structure design of the insert comprises that the insert is designed in a split mold structure, and is divided into at least four blocks by a parting line, and is connected with the upper mold by screws. After the flexible joint mold is formed as a whole, the insert needs to be removed first before the whole is taken out.

[0014] The structure design of the inner support ring comprises that before the movable inverted cone is fastened to the upper mold by the insert, the inner support ring supports the inner hole of the insert after the pre-tightening force of the screw is applied, so that the inner and outer circular surfaces of each insert are on the same circle, and the force of each part of the mating surface of the movable inverted cone is uniform, and the limiting degree is the same.

[0015] Preferably, a sealing groove structure for building a sealed cavity is arranged on the lower mold.

[0016] Preferably, a temperature measuring hole for detecting the temperature in the cavity is arranged on the lower mold, so as to achieve the purpose of real-time monitoring of the rubber vulcanization temperature.

[0017] Preferably, a temperature measuring hole for detecting the temperature in the cavity is arranged on the upper mold, so as to achieve the purpose of real-time monitoring of the rubber vulcanization temperature.

[0018] Preferably, after the tooling design is completed, mold testing is carried out, the fixed inverted cone of the metal part is fixed on the lower mold by screws, the movable inverted cone of the metal part is fixed on the upper mold by the insert, and then the reinforcing parts with qualified machining sizes are sequentially placed in the lower mold. After the mold is closed, the gap of the detectable part is measured, and if it is qualified, the mold testing is qualified.

[0019] The method for using the tool is as follows: the fixed joint after surface treatment and glue application is fixed on the lower mold, the reinforcing member and the rubber elastomer after surface treatment and glue application are staggered and laminated on the lower mold, the movable inverted cone after surface treatment and glue application is fixed on the upper mold by the insert, the upper mold and the lower mold are closed, gradient pressurization and gap pressure relief control are performed on the molding equipment, after molding, the screw for fastening and fixing the fixed joint of the lower mold is disassembled, the lower mold is separated by the screw, the insert is disassembled, and finally the flexible joint is taken out as a whole.

[0020] Compared with the prior art, the present application has the following advantages:

[0021] 1. The production cycle is shortened without the step-by-step bonding and molding link and the external cooperation process;

[0022] 2. The types of required adhesives are reduced;

[0023] 3. The bonding strength and the shape, position and size precision are further improved. DETAILED DESCRIPTION

[0024] The present application is further described in detail by the following specific examples.

[0025] A design method for a flexible joint integrated bonding and molding tool, comprising the following steps:

[0026] A) determining the assembly relationship between the parts;

[0027] B) determining the key position according to the assembly relationship determined in step A);

[0028] C) designing the sealing environment of the mold, which can ensure that the molten rubber fully fills the interface gap of the metal part when the pressure is applied during the molding process;

[0029] D) determining the mold closing qualification index;

[0030] E) according to the key position and the mold closing qualification index, performing process analysis in the sealing environment determined in step C), thereby designing the mold disassembly structure, and obtaining the specific structure of the lower mold, the upper mold, the insert and the inner support ring, wherein:

[0031] The structure design of the lower die includes that the outer cylindrical surface of the lower die is designed as a positioning surface of the inner cylindrical surface of the fixed rear joint, that is, the size of the fixed rear joint in XOY plane is limited to ensure the consistency of coaxial accuracy with the movable inverted cone, and the taper angle of the outer conical surface of the lower die is a high-precision critical dimension which, together with the conical surface of the insert, controls the position accuracy of the reinforcing part. The large circular end surface of the lower die is in a fit state with the large circular end surface of the upper die in the die testing process, and the gap therebetween is less than 0.02mm, which is used to determine whether each metal part is assembled in place or to determine whether the shape, position and size of each metal part are out of tolerance.

[0032] The structure design of the upper die includes that the movable inverted cone is fixed by the upper die and the insert, the gap between the inner conical surface of the upper die and the outer conical surface of the movable inverted cone is less than 0.05mm, the small head end surface of the upper die is fit with the movable inverted cone, and the step of the upper die is higher than the big head end of the movable inverted cone, so that no interference occurs in the die closing process.

[0033] The structure design of the insert includes that the insert is designed as a split die structure, which is divided into four blocks by a parting line and is connected with the upper die by screws. After the flexible joint die is formed as a whole, the insert needs to be removed first before the whole is taken out.

[0034] The structure design of the inner support ring includes that before the movable inverted cone is fastened to the upper die by the insert, the inner support ring supports the inner hole of the insert after the screw is pre-tightened, so that the inner and outer surfaces of each insert are on the same circle, ensuring that each part of the mating surface of the movable inverted cone is uniformly stressed and has the same limiting degree.

[0035] In addition, in the above design process, the lower die is provided with a sealing groove structure for constructing a sealed cavity. The lower die is also provided with a temperature measuring hole for detecting the temperature in the cavity, and the upper die is also provided with a temperature measuring hole for detecting the temperature in the cavity, so as to achieve the purpose of real-time monitoring of the rubber vulcanization temperature.

[0036] Finally, after completing the tool design, die testing is performed. The fixed inverted cone of the metal part is fixed on the lower die by screws, the movable inverted cone of the metal part is fixed on the upper die by the insert, and then the reinforcing part with qualified machining size is sequentially placed into the lower die. After die closing, the gap of the detectable part is measured, and if it is qualified, the die testing is qualified.

[0037] The flexible joint integrated bonding forming tool design method and the tool using method, wherein the tool is designed and manufactured according to the flexible joint integrated bonding forming tool design method; in use, the fixed joint after surface treatment and glue coating is fixed on the lower die, the reinforcing member and the rubber elastomer after surface treatment and glue coating are staggered and laminated on the lower die, the movable inverted cone after surface treatment and glue coating is fixed on the upper die by the insert, the upper die and the lower die are closed, the gradient pressure and the gap pressure relief control are performed on the molding equipment, after molding, the screw fastening the fixed joint of the lower die is disassembled, the lower die is separated by the screw, the insert is disassembled, and finally the flexible joint is taken out.

[0038] The flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool using method, wherein the flexible joint integrated bonding forming tool design method and the tool

Claims

1. A design method for an integrated bonding and molding tooling for flexible joints, characterized in that: Includes the following steps: A) Determine the assembly relationships between the parts; B) Determine the critical positions based on the assembly relationship determined in step A); C) Design the sealing environment for the mold; D) Determine the mold closing qualification criteria; E) Based on the critical location and mold closing qualification indicators, process analysis is performed in the sealed environment determined in step C) to design the demolding structure, obtaining the specific structures of the lower mold, upper mold, insert, and inner support ring, wherein: The structural design of the lower mold includes: the outer cylindrical surface of the lower mold is designed as the positioning surface of the inner cylindrical surface of the fixed joint; the large circular end face of the lower mold and the large circular end face of the upper mold are in a fitted state during the trial molding process, and the gap between them is less than 0.02mm. The upper mold structure design includes: fixing the movable inverted cone through the upper mold and the insert, the gap between the inner conical surface of the upper mold and the outer conical surface of the movable inverted cone is less than 0.05mm, the upper mold is in contact with the small end face of the movable inverted cone, and the step of the upper mold is higher than the large end face of the movable inverted cone; The structural design of the insert includes: the insert adopts a modular mold structure design, the parting line divides it into at least 4 pieces, and it is connected to the upper mold by screws; The structural design of the inner support ring includes: before the insert fastens the movable inverted cone to the upper mold, after the screw is pre-tightened, the inner support ring supports the inner hole of the insert, so that the inner and outer circular surfaces of each insert are on the same circle, ensuring that the force on each part of the mating surface of the movable inverted cone is uniform and the degree of limitation is the same. After completing the tooling design, a trial mold is made. The fixed inverted cone of the metal part is fixed to the lower mold with screws, and the movable inverted cone of the metal part is fixed to the upper mold with inserts. Then, the machined reinforcement parts with qualified dimensions are placed into the lower mold one by one in sequence. After the mold is closed, the gap of the inspectable parts is measured. If it is qualified, the trial mold is qualified.

2. The design method for the integrated bonding and molding tooling of flexible joints as described in claim 1, characterized in that: The lower mold is provided with a sealing groove structure for constructing a sealed cavity.

3. The design method for the integrated bonding and molding tooling of flexible joints as described in claim 1, characterized in that: The lower mold is provided with a temperature measuring hole for detecting the temperature inside the cavity.

4. The design method for the integrated bonding and molding tooling of flexible joints as described in claim 1, characterized in that: The upper mold is provided with a temperature measuring hole for detecting the temperature inside the cavity.

5. A method of using a tooling fixture, characterized in that: The tooling is designed and manufactured according to the integrated bonding molding tooling design method of flexible joint as described in any one of claims 1 to 4. In use, the fixed joint after surface treatment and adhesive application is fixed on the lower mold. Then, the reinforcement and rubber elastomer after surface treatment and adhesive application are alternately stacked on the lower mold. At the same time, the movable inverted cone after surface treatment and adhesive application is fixed on the upper mold with inserts. Finally, the upper mold and the lower mold are closed, and gradient pressure and gap pressure relief are controlled on the molding equipment. After molding is completed, the screws that fasten the joint after the lower mold are first removed, and the screws are ejected to separate the lower mold. Then, the inserts are removed, and finally the flexible joint is taken out as a whole.