CN110682559A - Method for forming aramid fiber composite material central cylinder - Google Patents
Method for forming aramid fiber composite material central cylinder Download PDFInfo
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- CN110682559A CN110682559A CN201910889602.XA CN201910889602A CN110682559A CN 110682559 A CN110682559 A CN 110682559A CN 201910889602 A CN201910889602 A CN 201910889602A CN 110682559 A CN110682559 A CN 110682559A
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- Prior art keywords
- aramid fiber
- prepreg
- epoxy resin
- molding method
- composite material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
- B29C70/545—Perforating, cutting or machining during or after moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2063/00—Use of EP, i.e. epoxy resins or derivatives thereof, as moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/753—Medical equipment; Accessories therefor
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a method for forming an aramid fiber composite material central cylinder, which selects aramid fiber reinforced flame-retardant epoxy resin prepreg as a forming material, adopts a steel core mould as a matched mould, is based on a prepreg vacuum bag pressing process, is suitable for forming the X-ray central cylinder, and has the advantages of simple equipment and small process risk. The method comprises the following steps: a, blanking prepreg; b, laying and pasting prepreg; c, manufacturing a vacuum bag; d, curing; e, demolding; f, trimming.
Description
Technical Field
The invention discloses a method for forming an aramid fiber composite material central cylinder, and belongs to the technical field of composite material forming.
Background
The central cylinder is one of main auxiliary accessories of the medical accelerator, is a shell structure of the medical accelerator, forms a barrier between a person and detection equipment in detection, protects the person from falling and smashing injury of the equipment, needs certain impact resistance, and can absorb X rays in a diagnosis and treatment process when in use, so that certain requirements are met in the aspects of material selection, forming process and the like. At present, most of aluminum central cylinders used in the industry have the problems of uneven thickness and high aluminum equivalent, X rays in the diagnosis and treatment process are unstable due to the uneven thickness, the aluminum equivalent is high, and the X rays in the diagnosis and treatment process are high in absorption.
Disclosure of Invention
The invention provides the molding method of the aramid fiber composite material central cylinder aiming at the defects in the prior art, and the method adopts the aramid fiber composite material to manufacture the central cylinder so as to solve the problems of uneven thickness and high aluminum equivalent, so that the central cylinder manufactured by the aramid fiber composite material has a series of outstanding advantages of even thickness, low aluminum equivalent, good impact resistance, insulation and the like.
The purpose of the invention is realized by the following technical scheme:
the molding method of the aramid fiber composite material center barrel adopts the aramid fiber reinforced flame-retardant epoxy resin composite material to manufacture the center barrel, and comprises the following steps:
step one, prepreg blanking: blanking aramid fiber reinforced flame-retardant epoxy resin prepreg according to the laying requirement;
step two, prepreg paving and pasting: paving prepreg sheets on the surface of the steel core mold, butting the prepreg sheets during paving, compacting layer by layer, wherein the compaction pressure value is more than 85 KPa;
step three, manufacturing a vacuum bag: vacuum pumping is carried out by sticking a vacuum bag around the core mould, the pressure value of the vacuum pumping is more than 90KPa, the pressure is maintained for more than 10 minutes, and the pressure change value is not more than 5KPa within 10 minutes after the vacuum source is closed;
step four, curing: curing according to a curing system of the aramid fiber reinforced flame-retardant epoxy resin prepreg;
step five, demolding: naturally cooling the die to below 60 ℃, and taking out the central cylinder blank;
step six, trimming: and (4) trimming the removed central cylinder blank to finally obtain the central cylinder.
In one implementation, the aramid fibers in the aramid fiber reinforced flame retardant epoxy resin prepreg are para-aramid and meta-aramid. Further, the aramid fiber protofilament in the aramid fiber reinforced flame-retardant epoxy resin prepreg is 500-4000 dtex.
In one embodiment, the aramid fiber cloth in the aramid fiber reinforced flame retardant epoxy resin prepreg is woven in a plain, twill or satin weave. Furthermore, the dry cloth gram weight of the aramid fiber cloth in the aramid fiber reinforced flame-retardant epoxy resin prepreg is 100-300 g per square meter.
In one implementation, the aramid fiber reinforced flame-retardant epoxy resin prepreg has a gel content of 30-70%.
In one implementation, the diameter of the cylindrical barrel of the steel core mold is 0.5-1 mm smaller than the designed size of the product.
In one implementation, the curing is performed by using an autoclave or an oven, and the curing system is as follows: curing temperature is 115-150 ℃, pressure is 0-600 KPa, and heat preservation time is 30-120 min.
The technical scheme of the invention has the following characteristics and beneficial effects:
the central cylinder needs to have flame retardance, impact resistance and uniform thickness, and the aramid fiber composite material meets the requirements of the central cylinder. The aramid fiber has good impact resistance, and the meta-aramid fiber has flame retardant property and thermal stability which are not possessed by para-aramid fiber. The tube wall of the central tube can absorb X-rays, stable X-rays are needed during diagnosis and treatment, the density of the tube wall of the central tube is uniform, the density of fiber cloth woven by smaller fiber yarn tows is more uniform, but the cost is high, so that 1000-1200 dtex is selected in consideration of two aspects of cost and density uniformity. The weaving mode of the fiber cloth can influence the density and thickness uniformity of the central cylinder, plain woven cloth is not easy to deform and is not suitable for products with complex appearance, forged pattern woven cloth is easy to deform, fiber bundles are easy to misplace, twill woven cloth is easy to deform, and the fiber bundles are not easy to misplace. The aramid fiber cloth has small gram weight, increases the labor cost for paving and pasting, is difficult to weave in large gram weight, and preferentially selects 180-200 g per square meter in combination with cost and weaving. The aramid fiber prepreg cloth has small glue content, the composite material is easy to be poor in glue, the glue content is large, the strength of the composite material can be reduced, and the aramid fiber composite material with 45% -55% of glue content has the highest strength. Autoclave solidification or oven solidification can all be during the solidification, and autoclave equipment price is high, can increase the cost of product, but autoclave solidification can reduce composite's porosity, improves composite intensity, and oven equipment price is low, and the composite intensity of solidification is slightly low with the autoclave solidification, considers the oven solidification of preferred chooseing for use in the aspect of the cost.
Drawings
FIG. 1 is a schematic view of a central cylinder made of aramid fiber composite material
Detailed Description
The technical scheme of the invention is further detailed in the following by combining the drawings and the embodiment:
referring to the attached drawing 1, the aramid fiber composite material central cylinder forming method comprises the following specific steps:
step one, prepreg blanking: blanking aramid fiber reinforced flame-retardant epoxy resin prepreg according to the laying requirement;
step two, prepreg paving and pasting: paving prepreg sheets on the surface of the steel core mold, wherein the prepreg sheets are butted during paving and compacted layer by layer, and the compaction pressure value is greater than 0.85 KPa;
step three, manufacturing a vacuum bag: pasting a vacuum bag around the core mold, vacuumizing and compacting, keeping the vacuumizing pressure value greater than 90KPa for more than 10 minutes, closing a vacuum source, and keeping the pressure change value within 10 minutes not greater than 5 KPa;
step four, curing: the temperature of the oven is raised to (125 +/-5) DEG C, when the temperature of the die is raised to 120 ℃, the temperature is kept for 150 min. The vacuum value in the vacuum bag is more than 0.065MPa in the curing process;
step five, demolding: naturally cooling the die to below 60 ℃, and taking out the central cylinder blank;
step six, trimming: and (4) trimming the removed central cylinder blank to finally obtain the central cylinder.
Compared with the prior art, the method selects the aramid fiber reinforced flame-retardant epoxy resin prepreg as the molding material, adopts the steel core mould as the matched mould, is based on the vacuum bag pressing process of the prepreg, and is suitable for forming the central cylinder of the X ray, and has simple equipment and small process risk.
The above detailed description explains the construction, features and effects of the present invention in detail, and is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of the illustrated embodiment, and it is within the scope of the present invention to cover the equivalent embodiments modified or modified by the equivalent changes according to the idea of the present invention without departing from the spirit covered by the description.
Claims (8)
1. A molding method of an aramid fiber composite material center cylinder is characterized by comprising the following steps: the molding method adopts aramid fiber reinforced flame-retardant epoxy resin composite material to manufacture the central cylinder, and comprises the following steps:
step one, prepreg blanking: blanking aramid fiber reinforced flame-retardant epoxy resin prepreg according to the laying requirement;
step two, prepreg paving and pasting: paving prepreg sheets on the surface of the steel core mold, butting the prepreg sheets during paving, compacting layer by layer, wherein the compaction pressure value is more than 85 KPa;
step three, manufacturing a vacuum bag: vacuum pumping is carried out by sticking a vacuum bag around the core mould, the pressure value of the vacuum pumping is more than 90KPa, the pressure is maintained for more than 10 minutes, and the pressure change value is not more than 5KPa within 10 minutes after the vacuum source is closed;
step four, curing: curing according to a curing system of the aramid fiber reinforced flame-retardant epoxy resin prepreg;
step five, demolding: naturally cooling the die to below 60 ℃, and taking out the central cylinder blank;
step six, trimming: and (4) trimming the removed central cylinder blank to finally obtain the central cylinder.
2. The molding method of the aramid fiber composite material center cylinder as claimed in claim 1, characterized in that: the aramid fiber in the aramid fiber reinforced flame-retardant epoxy resin prepreg is para-aramid fiber and meta-aramid fiber.
3. The molding method of the aramid fiber composite center tube as claimed in claim 1 or 2, characterized in that: the aramid fiber protofilament in the aramid fiber reinforced flame-retardant epoxy resin prepreg is 500-4000 dtex.
4. The molding method of the aramid fiber composite center tube as claimed in claim 1 or 2, characterized in that: the weaving mode of the aramid fiber cloth in the aramid fiber reinforced flame-retardant epoxy resin prepreg is plain weave, twill weave and satin weave.
5. The molding method of the aramid fiber composite center cylinder as claimed in claim 4, characterized in that: the dry cloth gram weight of aramid fiber cloth in the aramid fiber reinforced flame-retardant epoxy resin prepreg is 100-300 g/square meter.
6. The molding method of the aramid fiber composite center tube as claimed in claim 1 or 2, characterized in that: the content of the rubber in the aramid fiber reinforced flame-retardant epoxy resin prepreg is 30-70%.
7. The molding method of the aramid fiber composite material center cylinder as claimed in claim 1, characterized in that: the diameter of the columnar cylinder body of the steel core mold is smaller than the designed size of the product by 0.5-1 mm.
8. The molding method of the aramid fiber composite material center cylinder as claimed in claim 1, characterized in that: the curing adopts autoclave or oven curing, and the curing system is as follows: curing temperature is 115-150 ℃, pressure is 0-600 KPa, and heat preservation time is 30-120 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910889602.XA CN110682559A (en) | 2019-09-19 | 2019-09-19 | Method for forming aramid fiber composite material central cylinder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910889602.XA CN110682559A (en) | 2019-09-19 | 2019-09-19 | Method for forming aramid fiber composite material central cylinder |
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| CN110682559A true CN110682559A (en) | 2020-01-14 |
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| CN201910889602.XA Pending CN110682559A (en) | 2019-09-19 | 2019-09-19 | Method for forming aramid fiber composite material central cylinder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022213646A1 (en) * | 2021-04-07 | 2022-10-13 | 成都飞机工业（集团）有限责任公司 | Calibration block for ultrasonic phased array sector scanning, and manufacturing and usage methods therefor |
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| CN102285123A (en) * | 2011-08-26 | 2011-12-21 | 山东三达科技发展公司 | Manufacturing method of special-form composite product |
| CN104385624A (en) * | 2014-09-29 | 2015-03-04 | 北京空间机电研究所 | Forming method for composite material barrel shell employing horizontal installation |
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2019
- 2019-09-19 CN CN201910889602.XA patent/CN110682559A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102285123A (en) * | 2011-08-26 | 2011-12-21 | 山东三达科技发展公司 | Manufacturing method of special-form composite product |
| CN104385624A (en) * | 2014-09-29 | 2015-03-04 | 北京空间机电研究所 | Forming method for composite material barrel shell employing horizontal installation |
Non-Patent Citations (3)
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| 国家新材料产业发展专家咨询委员会: "《中国新材料产业发展年度报告 2017》", 31 August 2018, 冶金工业出版社 * |
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| 郭丰年 等: "《实用袋滤除尘技术》", 31 January 2015, 冶金工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022213646A1 (en) * | 2021-04-07 | 2022-10-13 | 成都飞机工业（集团）有限责任公司 | Calibration block for ultrasonic phased array sector scanning, and manufacturing and usage methods therefor |
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Application publication date: 20200114 |
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