Double-pulse engine shell winding process preparation method

Abstract

The invention discloses a double-pulse engine shell winding process preparation method, and belongs to the technical field of spaceflight. Comprising the following steps that S1, a mold pressing end socket and a combined core mold are installed; s2, paving a heat insulation layer, and prevulcanizing the heat insulation layer; s3, a winding program is set, and carbon fiber winding is carried out; s4, curing is conducted; s5, mounting an external hanging piece; s6, winding and fixing an external hanging piece; s7, slitting and machining; s8, mounting an interlayer fixing seat; and S9, integral machining is conducted. The manufacturing method is applied to manufacturing of the double-pulse engine shell and has the advantages of being short in production and manufacturing period, low in cost and good in product quality consistency.

Description

Technical Field

[0001] The invention relates to the field of aerospace technology, and in particular to a winding process preparation method for a dual-pulse engine casing. Background Art

[0002] The dual-pulse solid rocket engine is an innovative design that achieves differentiated operation through a unique thermal insulation layer structure in the combustion chamber. The purpose of this design is to introduce energy management strategies to optimize the overall performance and trajectory of the rocket and ensure that the complex technical requirements of the rocket launch are met. Carbon fiber wound composite shell products have been widely used in solid rocket engines due to their lightweight characteristics. Modern warfare requires higher range and accuracy of missiles. However, the dual-pulse shell has the characteristics of pulse ignition and dual-chamber dual thrust without changing the launch weight and size of the missile. It can better meet the above requirements and is adopted by tactical missiles at home and abroad.

[0003] At present, the main method for making dual-pulse shells is to use a single shell to be wound and formed separately, and then assembled and positioned after a single machining is completed. This method is relatively easy to make, but the separate winding requires two groups of people to make the product, which increases the production hours. The winding needs to be clamped and wound twice, which takes a long time. In addition, the positioning and machining of the external parts of the separate winding are difficult. With the rapid development of the aerospace industry in recent years, the demand for dual pulses has increased, and a low-cost, fast production cycle and good quality stability molding method is needed. The integrated winding process can greatly shorten the production cycle and improve product quality consistency. Summary of the invention

[0004] The purpose of the present invention is to provide a double-pulse engine casing winding process preparation method to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the present invention provides a double-pulse engine casing winding process preparation method, comprising the following steps:

[0006] S1. Install the molded head and the combined core mold;

[0007] S2, laying the insulation layer and pre-curing the insulation layer;

[0008] S3, setting the winding program and performing carbon fiber winding;

[0009] S4, curing;

[0010] S5, installing plug-ins;

[0011] S6, winding and fixing the external parts;

[0012] S7, slitting and machining;

[0013] S8. Install the interlayer fixing seat;

[0014] S9, overall machining.

[0015] Preferably, the S1 specifically comprises the following steps:

[0016] S11, first dry the molded head at a temperature of 60-80°C for 80-120 minutes, and polish the bonding area;

[0017] S12, first install the core mold connector on the core shaft, and install the molded head, pulse one shell core mold and pulse two shell core mold, front molded head and rear molded head, false head one and false head two on both sides of the core mold connector in sequence, and tighten and fix them with screws after installation;

[0018] S13, installing the combined core mold assembled in S12 to the winding machine, starting the winding machine, and rotating the main shaft to check whether each component is loose.

[0019] Preferably, S2 specifically includes the following steps:

[0020] S21, after cleaning the surface of the modular core mold that has passed the inspection in S13, laying a release cloth;

[0021] S22, using a calender to press the thermal insulation mass into 1mm-2mm thick paving sheets, cutting the paving sheets into suitable sizes, and chamfering and grinding the overlapping positions;

[0022] S23, laying the paving sheets on the combined core mold layer by layer, during which it is noted that the overlapping positions of the paving sheets are staggered, and the overlapping positions are polished and leveled;

[0023] S24, vacuum bag the entire insulation surface and perform pressurized exhaust treatment to below -80kpa;

[0024] S25, transferring the processed combined core mold to an oven for pre-vulcanization, so that the paving sheets are vulcanized into one; wherein the pre-vulcanization temperature is 80° C.-100° C., and the time is 180 min-200 min;

[0025] S26. After taking out of the oven, remove the vacuum bag and grind the overlapping positions to make them smooth.

[0026] Preferably, S3 specifically includes the following steps:

[0027] S31, installing the carbon fiber on the creel, setting the winding equipment tension to 50N / axis, and the winding angle to 15° to 20°;

[0028] S32, first apply a layer of interface glue on the surface of the insulation layer, dry it for 5min-10min, and then apply winding resin;

[0029] S33, the first layer of spiral winding needs to wrap around and cover the false heads on both sides, and the circumferential winding of the back pressure starts from the position of the interlayer fixing seat and winds towards the positions of the false heads on both sides. When winding to the root bridging area of ​​the false head, cut off the winding layer on the false head and make it flat, and continue the circumferential winding until it reaches the end point;

[0030] S34, strengthening the local weak areas of strength calculation;

[0031] S35, repeating S33 and S34 operations three times in the order of strength calculation;

[0032] S36. Check the flatness of the product and use hoop winding to fill and level the defective positions.

[0033] Preferably, the S4 specifically includes the following steps:

[0034] S41, wrap 2 layers of adhesive tape around the outside of the wound carbon fiber, then wrap a layer of non-porous isolation film, and use dry yarn to wrap 3-5 layers for pressurization;

[0035] S42, installing the rotary curing tooling, then transporting it to the oven and connecting it to the oven rotating device;

[0036] S43, setting the curing temperature to 150°C-160°C and the curing time to 6h-8h.

[0037] Preferably, the S5 specifically includes the following steps:

[0038] S51, installing the first and second external hangers on the external hanger tooling for trial installation, and if there is any non-conformity, grinding the bottom rubber of the two external hangers;

[0039] S52, after the positions of the two external components are located, protection is provided on the periphery of the two external components;

[0040] S53, applying a layer of structural adhesive on the lower surfaces of the two external parts;

[0041] S54, pasting the two external parts according to the positions marked by the test assembly, and fixing and maintaining the shape with the external parts tooling after pasting;

[0042] S55, move into an oven for heating and curing, the curing temperature is 60°C-80°C, and the time is 120min-180min.

[0043] Preferably, the S6 specifically comprises the following steps:

[0044] S61, wrapping around the two sides of the external component area to bind;

[0045] S62. Wrap 2 layers of adhesive tape around the wrapping area of ​​the external component fixing ring, and move it into an oven for low-temperature curing at a temperature of 60°C-70°C for 8-10 hours.

[0046] Preferably, the S7 specifically includes the following steps:

[0047] S71, remove the external parts tooling and the mandrel in order, and flush the mandrel with 90℃-100℃ hot water;

[0048] S72, draw a cutting line according to the design size, and use a cutting device to cut along the cutting line to obtain a pulse shell 1 and a pulse shell 2;

[0049] S73, the two shells after cutting are respectively added with interface machines to the required size according to the digital model requirements;

[0050] S74. After machining is completed, use three coordinates to check the size.

[0051] Preferably, the S8 specifically includes the following steps:

[0052] S81, assemble the mandrel and the interlayer fixing seat;

[0053] S82. Install the two machined shells on the mandrels respectively and connect them to the partition fixing seats. During installation, keep the hangers on the two shells in one line.

[0054] Preferably, the S9 specifically includes the following steps:

[0055] S91, clamp the mandrel with the shell on the horizontal machining shaft, and drill the connection holes between the shell and the interlayer fixing seat;

[0056] S92, adding the external parts on the two shells into place;

[0057] S93, using three-coordinate to detect the symmetry of the external parts machining;

[0058] S94. After removing the machined shaft, clean up the burrs caused by machining.

[0059] Compared with the prior art, the present invention has the following advantages and technical effects:

[0060] 1. The dual-pulse engine casing winding process preparation method provided by the present invention can not only ensure product quality, but also shorten the production cycle by 50%-60%, improve production efficiency, and give full play to the advantages of co-winding.

[0061] 2. The two pulse shells of the present invention are integrally formed, not separately wound, and the coaxiality and other geometric tolerances of the product's external parts can be more accurately controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0063] Figure 1 It is a structural diagram of the present invention;

[0064] Figure 2 It is a partial enlarged view of the present invention;

[0065] Figure 3 It is a structural schematic diagram of the winding core mold used in the present invention;

[0066] Figure 4 is a preparation flow chart of the present invention;

[0067] In the figure: 1. Pulse 2 shell; 2. Pulse 1 shell; 3. Front molded head; 4. Rear molded head; 5. Interlayer fixing seat; 6. External component 1; 7. External component 2; 8. Mandrel; 9. Core mold of pulse 1 shell; 10. Core mold of pulse 2 shell; 11. Core mold connecting part; 12. False head 1; 13. False head 2; 14. External component tooling. DETAILED DESCRIPTION

[0068] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0069] like Figures 1 to 4 As shown, the present invention provides a double-pulse engine casing winding process preparation method, comprising the following steps:

[0070] S1. Install the molded head and the combined core mold; the combined core mold is used for one-piece molding, and the quality stability of the product is more consistent;

[0071] S2. Lay the insulation layer and pre-vulcanize the insulation layer. Pre-vulcanization of the insulation layer can make the insulation pressurization more sufficient, the thickness of the insulation layer more uniform and the thickness control more precise.

[0072] S3, setting the winding program and performing carbon fiber winding;

[0073] S4, curing;

[0074] S5. Install external parts. The external parts are installed as a whole, and the control of coaxiality and relative position relationship is more precise.

[0075] S6. Wrap and fix the external parts. The external parts are fixed by wrapping, and will not fall off due to force during use. The fixing method is safer and more reliable.

[0076] S7, slitting and machining;

[0077] S8. Install the interlayer fixing seat 5. After the interlayer fixing seat 5 is installed, it is punched and machined as a whole, making it easier to disassemble and reinstall the product later.

[0078] S9, integral machining; integral machining and integrated alignment, the product has good coaxiality and good consistency in the position relationship of each component.

[0079] To further optimize the solution, S1 specifically includes the following steps:

[0080] S11, first dry the molded head at a temperature of 60-80°C for 80-120 minutes, and polish the bonding area;

[0081] S12, first install the core mold connector 11 on the core shaft 8, and install the molded head, pulse shell core mold 1 9 and pulse shell core mold 2 10, front molded head 3 and rear molded head 4, false head 1 12 and false head 2 13 on both sides of the core mold connector 11 in sequence, and tighten and fix them with screws after installation;

[0082] S13, installing the combined core mold assembled in S12 to the winding machine, starting the winding machine, and rotating the main shaft to check whether each component is loose.

[0083] To further optimize the solution, S2 specifically includes the following steps:

[0084] S21, after cleaning the surface of the modular core mold that has passed the inspection in S13, laying a release cloth;

[0085] S22, using a calender to press the thermal insulation mass into 1mm-2mm thick paving sheets, cutting the paving sheets into suitable sizes, and chamfering and grinding the overlapping positions;

[0086] S23, laying the paving sheets on the combined core mold layer by layer, during which it is noted that the overlapping positions of the paving sheets are staggered, and the overlapping positions are polished and leveled;

[0087] S24, vacuum bag the entire insulation surface and perform pressurized exhaust treatment to below -80kpa;

[0088] S25, transferring the processed combined core mold to an oven for pre-vulcanization, so that the paving sheets are vulcanized into one; wherein the pre-vulcanization temperature is 80° C.-100° C., and the time is 180 min-200 min;

[0089] S26. After taking out of the oven, remove the vacuum bag and grind the overlapping positions to make them smooth.

[0090] To further optimize the solution, S3 specifically includes the following steps:

[0091] S31, installing the carbon fiber on the creel, setting the winding equipment tension to 50N / axis, and the winding angle to 15° to 20°;

[0092] S32, first apply a layer of interface glue on the surface of the insulation layer, dry it for 5min-10min, and then apply winding resin;

[0093] S33, the first layer of spiral winding needs to wrap around and cover the false heads on both sides, and the circumferential winding of the back pressure starts from the position of the interlayer fixing seat 5 and winds towards the positions of the false heads on both sides. When winding to the root bridging area of ​​the false head, the winding layer on the false head is cut off and processed flat, and the circumferential winding is continued until the winding reaches the end point;

[0094] S34, strengthening the local weak areas of strength calculation;

[0095] S35, repeating S33 and S34 operations three times in the order of strength calculation, during which the second layer of spiral winding needs to be cut off at the position of the pulse second shell 1;

[0096] S36. Check the flatness of the product and use hoop winding to fill and level the defective positions.

[0097] To further optimize the solution, S4 specifically includes the following steps:

[0098] S41, wrap 2 layers of adhesive tape around the outside of the wound carbon fiber, then wrap a layer of non-porous isolation film, and use dry yarn to wrap 3-5 layers for pressurization;

[0099] S42, installing the rotary curing tooling, then transporting it to the oven and connecting it to the oven rotating device;

[0100] S43, setting the curing temperature to 150°C-160°C and the curing time to 6h-8h.

[0101] To further optimize the solution, S5 specifically includes the following steps:

[0102] S51, installing the external component 1 6 and the external component 2 7 on the external component tooling 14 for trial installation, and if there is any non-conformity, grinding the bottom rubber of the two external components;

[0103] S52. After the two external components are positioned, high temperature tape is used to protect the outer periphery of the two external components;

[0104] S53, applying a layer of structural adhesive on the lower surfaces of the two external parts;

[0105] S54, pasting the two external parts according to the positions marked by the test assembly, and after pasting, using the external part tooling 14 to fix and maintain the shape;

[0106] S55, move into an oven for heating and curing, the curing temperature is 60°C-80°C, and the time is 120min-180min.

[0107] To further optimize the solution, S6 specifically includes the following steps:

[0108] S61, wrapping around the two sides of the external component area to bind;

[0109] S62. Wrap 2 layers of adhesive tape around the wrapping area of ​​the external component fixing ring, and move it into an oven for low-temperature curing at a temperature of 60°C-70°C for 8-10 hours.

[0110] To further optimize the solution, S7 specifically includes the following steps:

[0111] S71, remove the external fixture 14 and the mandrel 8 in order, and flush the mandrel mold with 90°C-100°C hot water;

[0112] S72, draw a cutting line according to the design size, and use a cutting device to cut along the cutting line to obtain a pulse shell 1 2 and a pulse shell 2 1;

[0113] S73, the two shells after cutting are respectively added with interface machines to the required size according to the digital model requirements;

[0114] S74. After machining is completed, use three coordinates to check the size.

[0115] To further optimize the solution, S8 specifically includes the following steps:

[0116] S81, assemble the mandrel 8 and the interlayer fixing seat 5;

[0117] S82, respectively install the two machined shells on the core shaft 8 and connect them to the partition fixing seat 5, and keep the hangers on the two shells in one line during installation.

[0118] To further optimize the solution, S9 specifically includes the following steps:

[0119] S91, clamp the mandrel 8 with the shell on the horizontal machining shaft, and drill the connection holes between the shell and the interlayer fixing seat 5;

[0120] S92, adding the external parts on the two shells into place;

[0121] S93, using three-coordinate to detect the symmetry of the external parts machining;

[0122] S94. After removing the machined shaft, clean up the burrs caused by machining.

[0123] Example

[0124] The carbon fiber used below is domestically produced T700 grade 12k carbon fiber, the resin used is an epoxy resin system, and the insulating rubber is EPDM.

[0125] Before assembling the combined core mold, a layer of demoulding cloth is laid on the outer surface, and then the molded head and the block mold are assembled into the combined core mold.

[0126] After assembly, EPDM is laid on the surface of the modular core mold. After laying, the EPDM is vacuumed and the insulation layer is pre-vulcanized. During the EPDM laying process, glass fiber yarn can be added for circumferential pressure to discharge the air between the EPDM layers in the thick insulation area. The surface of the insulation layer after vulcanization is polished and smooth.

[0127] The combined core mold is installed on the winding machine and clamped. The insulation layer surface is coated with winding interface glue and epoxy resin, which needs to be dried for 10-15 minutes after coating.

[0128] After the carbon fiber yarn is arranged, the yarn tension is set to 50N / axis, and the winding program is set, and the winding program is set to multiple cutting points; the first spiral covers the entire product, including the false head 12 and the false head 2 13, and the subsequent circumferential winding starts from the core mold connector 11 and is wound to both sides respectively. The winding process is paused at the bridging area of ​​the false heads on both sides, and the fiber yarns on the two false heads are cut, and after being smoothed, the circumferential winding is continued until the winding reaches the end point; after winding, the reinforcing carbon cloth is filled layer by layer according to the reinforcement position requirements of the strength calculation, and the above steps are repeated until the winding is completed.

[0129] Transfer to an oven for curing, the curing system is 150-160°C, the time is 6-8h, the heating rate is no more than 2°C / min, preferably, the actual curing system adds a heating step, 80°C, 120°C insulation for 1-2h. Spiral curing is selected during curing.

[0130] The product is cut using cutting tools along the cutting line. After cutting, the products are machined separately in the machining center and tested. After the testing, the shell and the partition fixing seat 5 are assembled and machined as a whole. The connection holes are punched, the external parts are machined in place and the quadrant lines are engraved. Finally, the burrs and dust are cleaned after disassembly. A connection line is engraved on the partition fixing seat 5 and the two shells to facilitate the subsequent repeated assembly and connection.

[0131] The present invention is applied to the production of a double-pulse engine casing and has the advantages of short production cycle, low cost and good product quality consistency.

[0132] The above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A double pulse engine casing winding process preparation method, characterized in that: The following steps are involved: S1. Install the molded head and the combined core mold; S2, laying the insulation layer and pre-curing the insulation layer; S3, setting the winding program and performing carbon fiber winding; S4, curing; S5, installing plug-ins; S6, winding and fixing the external parts; S7, slitting and machining; S8, installing the interlayer fixing seat (5); S9, overall machining.

2. The method for preparing the double-pulse engine casing by winding process according to claim 1, characterized in that: The S1 specifically includes the following steps: S11, first dry the molded head at a temperature of 60-80°C for 80-120 minutes, and polish the bonding area; S12, first install the core mold connecting piece (11) on the core shaft (8), and then install the molded head, the pulse shell core mold (9) and the pulse shell core mold (10), the front molded head (3) and the rear molded head (4), the false head one (12) and the false head two (13) on both sides of the core mold connecting piece (11) in sequence, and after the installation is completed, tighten and fix them with screws; S13, installing the combined core mold assembled in S12 to the winding machine, starting the winding machine, and rotating the main shaft to check whether each component is loose.

3. The method for preparing the double-pulse engine casing by winding process according to claim 2 is characterized in that: The S2 specifically includes the following steps: S21, after cleaning the surface of the modular core mold that has passed the inspection in S13, laying a release cloth; S22, using a calender to press the thermal insulation mass into 1mm-2mm thick paving sheets, cutting the paving sheets into suitable sizes, and chamfering and grinding the overlapping positions; S23, laying the paving sheets on the combined core mold layer by layer, during which it is noted that the overlapping positions of the paving sheets are staggered, and the overlapping positions are polished and leveled; S24, vacuum bag the entire insulation surface and perform pressurized exhaust treatment to below -80kpa; S25, transferring the processed combined core mold to an oven for pre-vulcanization, so that the paving sheets are vulcanized into one; wherein the pre-vulcanization temperature is 80° C.-100° C., and the time is 180 min-200 min; S26. After taking out of the oven, remove the vacuum bag and grind the overlapping positions to make them smooth.

4. The method for preparing the double-pulse engine casing by winding process according to claim 3 is characterized in that: The S3 specifically includes the following steps: S31, installing the carbon fiber on the creel, setting the winding equipment tension to 50N / axis, and the winding angle to 15° to 20°; S32, first apply a layer of interface glue on the surface of the insulation layer, dry it for 5min-10min, and then apply winding resin; S33, the first layer of spiral winding needs to wrap around and cover the false heads on both sides, and the circumferential winding of the back pressure starts from the position of the interlayer fixing seat (5) and winds towards the positions of the false heads on both sides. When winding to the root bridging area of ​​the false heads, the winding layer on the false heads is cut off and processed to be flat, and the circumferential winding is continued until the winding reaches the end point; S34, strengthening the local weak areas of strength calculation; S35, repeating S33 and S34 operations three times in the order of strength calculation; S36. Check the flatness of the product and use hoop winding to fill and level the defective positions.

5. The method for preparing the double-pulse engine casing by winding process according to claim 4 is characterized in that: The S4 specifically includes the following steps: S41, wrap 2 layers of adhesive tape around the outside of the wound carbon fiber, then wrap a layer of non-porous isolation film, and use dry yarn to wrap 3-5 layers for pressurization; S42, installing the rotary curing tooling, then transporting it to the oven and connecting it to the oven rotating device; S43, setting the curing temperature to 150°C-160°C and the curing time to 6h-8h.

6. The method for preparing the double-pulse engine casing by winding process according to claim 5 is characterized in that: The S5 specifically includes the following steps: S51, installing the external component 1 (6) and the external component 2 (7) on the external component tooling (14) for trial installation. If there is any non-conformity, the bottom rubber of the two external components is polished; S52, after the positions of the two external components are located, protection is provided on the periphery of the two external components; S53, applying a layer of structural adhesive on the lower surfaces of the two external parts; S54, pasting the two external parts according to the positions marked by the test assembly, and after pasting, using the external part tooling (14) to fix and maintain the shape; S55, move into an oven for heating and curing, the curing temperature is 60°C-80°C, and the time is 120min-180min.

7. The method for preparing the double-pulse engine casing by winding process according to claim 6 is characterized in that: The S6 specifically includes the following steps: S61, wrapping around the two sides of the external component area to bind; S62. Wrap 2 layers of adhesive tape around the wrapping area of ​​the external component fixing ring, and move it into an oven for low-temperature curing at a temperature of 60°C-70°C for 8-10 hours.

8. The method for preparing the double-pulse engine casing by winding process according to claim 7 is characterized in that: The S7 specifically includes the following steps: S71, remove the external component tooling (14) and the mandrel (8) in order, and flush the mandrel mold with 90° C.-100° C. hot water; S72, draw a cutting line according to the design size, and use a cutting device to cut along the cutting line to obtain a pulse housing (2) and a pulse housing (1); S73, the two shells after cutting are respectively added with interface machines to the required size according to the digital model requirements; S74. After machining is completed, use three coordinates to check the size.

9. The method for preparing the double-pulse engine casing by winding process according to claim 8, characterized in that: The S8 specifically includes the following steps: S81, assemble the mandrel (8) and the interlayer fixing seat (5); S82, respectively install the two machined shells on the core shaft (8) and connect them to the partition fixing seat (5), and keep the hangers on the two shells in a line during installation.

10. The method for preparing the double-pulse engine casing by winding process according to claim 9, characterized in that: The S9 specifically includes the following steps: S91, clamp the mandrel (8) that has been threaded through the shell onto the horizontal machining shaft, and drill the connection holes between the shell and the interlayer fixing seat (5); S92, adding the external parts on the two shells into place; S93, using three-coordinate to detect the symmetry of the external parts machining; S94. After removing the machined shaft, clean up the burrs caused by machining.

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