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CN-121973472-A - Forming method of high-strength composite material isolation sleeve

CN121973472ACN 121973472 ACN121973472 ACN 121973472ACN-121973472-A

Abstract

The invention belongs to the technical field of composite material isolation sleeves, and discloses a forming method of a high-strength composite material isolation sleeve, wherein before resin is solidified, 0.8-1.2 MPa pressure carrier is injected into a bag type positive mold cavity, uniform tension is applied to a continuous fiber preform in all directions by utilizing expansion of a bag body, and a reserved gap between the preform and a female mold is matched with the tension expansion size. The design ensures that fibers are regularly arranged in the whole curing process, local curling and stacking are avoided, the tensile property of the formed composite material isolation sleeve is greatly improved, the compressive strength meets the strict requirement of a magnetic pump as a pressure-bearing member, the failure risk of the traditional product caused by fiber stress disorder is fundamentally solved, the negative pressure suction module cavity is firstly sucked for 15-20 minutes under the pressure of-0.095 to-0.098 MPa, the air in the cavity is thoroughly discharged, the defoamed resin is sucked into the cavity by the negative pressure, the flow speed is controlled to prevent the fibers from shifting, and the resin is ensured to fully and uniformly infiltrate the prefabricated body.

Inventors

  • TANG QI
  • TANG SIYUAN

Assignees

  • 大连罗兰泵业有限公司

Dates

Publication Date
20260505
Application Date
20260402

Claims (8)

  1. 1. A forming method of a high-strength composite material isolation sleeve is characterized by comprising the following specific steps: s1, assembling and sealing a mold, namely placing a continuous fiber preform into a female mold cavity, reserving a gap matched with the tension expansion size of the preform, installing a bag-type male mold, covering a blind flange, embedding a sealing rubber ring, and fastening and sealing by bolts; S2, performing vacuum pretreatment on the module, namely firstly closing a glue injection valve of a glue injection pipe orifice, connecting a vacuum pump with a vacuum pipe orifice, checking the tightness, opening the vacuum valve to perform negative pressure suction with the vacuum pump, and closing the vacuum valve and the vacuum pump after the vacuum degree is stable; s3, resin injection operation, namely filling quantitative defoamed resin into the glue injection box, opening a glue injection valve, sucking glue into the cavity by utilizing negative pressure, and closing the glue injection valve to prevent backflow after the resin fully covers the preform; S4, pressurizing the bag-type male die, namely connecting a pressurizing pipe orifice with injection equipment, opening a pressurizing valve to slowly inject carriers, maintaining the pressure for 5-8 minutes, closing the pressurizing valve, and removing the glue injection box and each pipeline; S5, heating and curing under pressure, namely, keeping a pressurized state, horizontally conveying the module into a heating insulation box, and measuring pressure and supplementing pressure every 30 minutes by using epoxy resin if the epoxy resin is used, so that the resin is completely cured and the fiber is kept at uniform tension; s6, cooling the module, namely after solidification, closing a power supply of the heat preservation box to naturally cool the module to 60 ℃ along with the box, taking out the module, placing the module at a ventilation place for air cooling, and protecting the module from deformation in a sealing way in the whole process; S7, withdrawing the die set, namely after the die set is cooled to room temperature, symmetrically disassembling blind flange bolts by using a wrench, taking down the blind flange and the sealing rubber ring, connecting the bag-type male die with negative pressure equipment, vacuumizing and contracting, and slowly taking out.
  2. 2. The method for forming a high-strength composite spacer according to claim 1, wherein the specific steps of mold assembly and sealing in the step S1 are as follows: s11, assembling a core component, namely placing a continuous fiber preform into a female die cavity, reserving a gap, wherein the gap is completely matched with the radial expansion size of the preform under the action of the subsequent tension; S12, sealing and fixing the module, namely after the assembly is completed, covering the blind flange, aligning with the female die port, embedding the sealing rubber ring to fill the contact gap, and uniformly fastening the blind flange by using bolts.
  3. 3. The method for forming a high-strength composite spacer according to claim 1, wherein the module vacuum pretreatment in the step S2 comprises the following specific steps: s21, preprocessing and preparing for connection, namely firstly closing an injection valve corresponding to an injection pipe opening at the top of the female die, cutting off an injection channel, and then connecting a vacuumizing pipe opening at the bottom of the side surface of the female die with a vacuum pump through a pipeline, wherein the pipeline interface keeps tightness during connection; s22, vacuum pumping and pressure maintaining, namely starting a vacuum valve and a vacuum pump, setting negative pressure values of-0.095 to-0.098 MPa, continuously pumping the cavity of the module for 15-20 minutes, closing the vacuum valve and then closing the vacuum pump after pumping is completed, and maintaining the negative pressure in the cavity.
  4. 4. The method for forming a high-strength composite spacer according to claim 1, wherein the resin injection operation in step S3 comprises the following specific steps: S31, resin pretreatment and glue injection preparation, namely filling a certain amount of liquid resin into a glue injection box, uniformly mixing the resin according to a formula in advance, and adopting vacuum defoaming treatment, wherein the module still maintains a negative pressure state; S32, negative pressure glue injection and process control, namely opening a glue injection valve at a glue injection pipe orifice, sucking resin into a module cavity by utilizing negative pressure in the cavity, controlling flow rate by adjusting valve opening during glue injection, and paying attention to backflow prevention of the glue valve when the resin fully covers the preform and the liquid level is not lowered.
  5. 5. The method for forming a high-strength composite spacer according to claim 1, wherein the step S4 of pressurizing the bladder-type male mold comprises the following specific steps: S41, connecting pressurizing equipment and parameter setting, namely connecting a pressurizing pipe orifice at the bottom of the blind flange with a pressure injection equipment through a pipeline, setting the pressure resistance level of the pipeline to be not lower than 1.5 times of the set pressure, and setting the pressure value of the pressure injection equipment to be 0.8-1.2 MPa, wherein a pressure carrier is one of compressed air or hydraulic oil; S42, pressurizing operation and pipeline dismantling, namely opening a pressurizing valve, injecting a pressure carrier into the cavity of the bag-type male die, closing the pressurizing valve after the pressure reaches a set value and is stable for 5-8 minutes, and dismantling the glue injection box, the vacuumizing pipeline and the pressurizing pipeline.
  6. 6. The method for forming a high-strength composite spacer according to claim 1, wherein the step S5 comprises the following steps: s51, feeding the module into a box and basic curing parameters, namely feeding the module in a pressure maintaining state into a heating insulation box, keeping the module horizontal when being placed, heating the module from room temperature to 80 ℃ at a rate of 2-3 ℃ per minute according to the process, and preserving the temperature for 1.5 hours at the room temperature to primarily crosslink the resin; S52, curing temperature rise and pressure monitoring, namely after preliminary crosslinking, continuously heating to 120 ℃ and preserving heat for 2.5 hours to ensure that the resin is completely cured, recording the pressure of the module every 30 minutes in the whole curing process, and entering a cooling link after curing is finished.
  7. 7. The method for forming a high-strength composite spacer according to claim 1, wherein the module cooling treatment in the step S6 comprises the following specific steps: s61, naturally cooling the inside of the heat preservation box, namely after solidification is finished, closing a power supply of the heating heat preservation box, naturally cooling the module to 60 ℃ along with the box, and keeping the module sealed during cooling; And S62, taking out the module, performing air cooling and temperature control, namely taking out the module from the heat insulation box, performing air cooling in a ventilated normal-temperature environment, controlling the cooling rate to be 5-8 ℃ per minute, measuring the surface temperature of the module by using a thermometer in real time, and cooling to the room temperature to finish cooling treatment.
  8. 8. The method for forming a high-strength composite spacer according to claim 1, wherein the step S7 of removing the mold comprises the following steps: s71, dismantling auxiliary parts, namely symmetrically dismantling connecting bolts of the blind flange and the female die by using a spanner, then removing the blind flange and the bottom sealing rubber ring, connecting a pressurizing pipe orifice of the bag-type male die with negative pressure equipment, vacuumizing to shrink the bag body to an initial size, and then taking out the bag body; S72, separating and taking out the product, namely checking the attaching state of the female die and the isolation sleeve, and beating the outer wall of the female die by soft cloth, and taking out the finished product of the formed composite isolation sleeve after the female die and the isolation sleeve are completely separated.

Description

Forming method of high-strength composite material isolation sleeve Technical Field The invention belongs to the technical field of composite material isolation sleeves, and particularly relates to a forming method of a high-strength composite material isolation sleeve. Background The magnetic pump is used as a non-leakage conveying device, the core bearing member is a composite material isolation sleeve, the member directly bears the pressure of conveying media, and has strict requirements on the tensile strength of the material, namely if the tensile strength is insufficient, the isolation sleeve is easy to crack and the media leak, the operation safety and the stability of the magnetic pump are directly affected, and the following technical problems still exist in the traditional composite material isolation sleeve forming process: the traditional technology adopts a fixed male die, the appearance of the preform can be limited only by the size of a cavity, the supporting force cannot be dynamically adjusted according to the stress state of the fiber in the forming process, when the fiber is immersed by resin and generates micro deformation, the fixed male die cannot adapt to the deformation, the fiber is easily curled or loosened by partial compression, and the hidden danger is caused by uneven follow-up tension; the traditional process usually adopts normal pressure pouring or simple vacuum glue injection, the former can not be discharged due to air in a cavity, bubbles are easily formed at the interface of the fiber and the resin, and the stress continuity of the fiber is destroyed; most of the traditional process is in a normal pressure or non-active pressure maintaining state in the curing stage, the resin can generate volume shrinkage in the crosslinking process, the shrinkage force can directly loosen the fiber, the fiber cannot keep an initial regular form after curing, and finally, a local pressure-resistant weak area appears in the isolation sleeve, so that the severe requirement of long-term pressure bearing of the magnetic pump is difficult to meet. The defects of the traditional process are not isolated, but the vicious circle of insufficient die adaptation, fiber displacement during infiltration, tension loss during curing is formed, and conventional local optimization (such as only improving a glue injection mode and only adjusting a curing temperature) cannot be fundamentally solved. Disclosure of Invention The invention aims to provide a forming method of a high-strength composite material isolation sleeve, which aims to solve the problems in the background technology. In order to achieve the purpose, the invention provides the following technical scheme that the method for forming the high-strength composite material isolation sleeve comprises the following specific steps: S1, assembling and sealing a mold, namely placing the cut continuous fiber preform into a female mold cavity, reserving a gap matched with the tension expansion size of the preform, placing an inflatable bag type male mold, covering a blind flange, embedding a sealing rubber ring, fastening and sealing by bolts, and subsequently avoiding air leakage and glue leakage; S2, performing vacuum pretreatment on the module, namely closing a glue injection valve of a glue injection pipe orifice after the module is sealed, connecting a vacuumizing pipe orifice with a vacuum pump, checking the tightness, opening the vacuum valve and the vacuum pump, sucking for 15-20 minutes at negative pressure of-0.095 to-0.098 MPa, closing the vacuum valve and the vacuum pump after the vacuum degree is stable, and keeping the negative pressure in the cavity; S3, resin injection operation, namely filling quantitative defoamed resin into the glue injection box by means of negative pressure in the cavity of the module, standing for 10-15 minutes or defoamating in vacuum, slowly opening a glue injection valve, sucking glue into the cavity by means of negative pressure, controlling the flow rate to prevent fiber displacement, observing the liquid level and infiltration condition, and closing the glue injection valve to prevent backflow after the resin fully covers the preform; S4, pressurizing the bag-type male mold, namely connecting a pressurizing pipe orifice with injection equipment (the pressure resistance of a pipeline is not less than 1.5 times of the set pressure) after resin infiltration, setting 0.8-1.2 MPa pressure (carrier gas or liquid selection), opening a pressurizing valve to slowly inject the carrier, closing the valve after pressure maintaining for 5-8 minutes, and detaching the glue injection box and each pipeline to enable the bag-type male mold to expand and apply uniform tension; S5, heating and curing under pressure, namely, horizontally conveying the module into a heating insulation box, heating to 80 ℃ for 1.5 hours at 2-3 ℃ per min, heating to 120 ℃ for 2.5 hours, and measuring pressure and supplementing pressure every 30