CN115742183A - Silicone rubber thermal expansion molding process for carbon fiber composite square tube - Google Patents
Silicone rubber thermal expansion molding process for carbon fiber composite square tube Download PDFInfo
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- CN115742183A CN115742183A CN202211464608.0A CN202211464608A CN115742183A CN 115742183 A CN115742183 A CN 115742183A CN 202211464608 A CN202211464608 A CN 202211464608A CN 115742183 A CN115742183 A CN 115742183A
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Abstract
The invention discloses a thermal expansion forming process of silicon rubber for a carbon fiber composite square tube, which has the technical scheme that: the method comprises the following steps: step 1, injecting silicon rubber into a silicon rubber square tube core mold, curing and demolding to manufacture a silicon rubber square tube core mold, wherein the silicon rubber square tube core mold consists of a square tube core mold upper mold and a square tube core mold lower mold; step 2, injecting silicon rubber into a silicon rubber wedge strip core mold, demolding after curing to manufacture a silicon rubber wedge strip, wherein a forming mold of the silicon rubber wedge strip consists of a cylindrical core mold, a mold main body and a side plate, and the forming mold of the silicon rubber wedge strip is used for manufacturing the silicon rubber wedge strip; the circular rotating core mold is provided with a first threaded hole and is connected with the side plate through a fastener; the surface of the die is provided with the uniform pressing plate, compared with the surface of a formed carbon fiber composite square tube, the surface is smooth, the forming quality is good, the wall thickness is uniform, and the subsequent polishing workload is reduced.
Description
Technical Field
The invention relates to the field of pipe fitting processing, in particular to a thermal expansion forming process for silicon rubber of a carbon fiber composite square pipe.
Background
The carbon fiber composite square tube has the advantages of high specific strength, high specific modulus, corrosion resistance and the like, and the square tube support has wide application. The invention relates to a forming process and a forming tool for a carbon fiber composite square tube with the section side length of about 50mm, the length of about 1m and the thickness of within 5 mm.
The defects and shortcomings of the prior art are as follows:
the mass production and forming method of the carbon fiber composite square tubes mainly comprises pultrusion and winding forming and the like, the processing efficiency is high, equipment is expensive, and meanwhile, the fiber layering angle is limited, so that the advantages of carbon fibers cannot be fully exerted.
The forming process method capable of realizing the paving and pasting at any paving angle comprises male die forming and female die forming:
the male die forming process mostly adopts the modes of a metal core die, a water-soluble sand core die, a surface layer wound BOPP film or a heat-shrinkable sleeve and the like, the surface of a formed part is rough, and the fiber can be damaged in the later-stage surface processing; the female die forming process mainly comprises an air bag internal expansion method, a silicon rubber expansion method and the like, the surface state of the inner cavity of a formed workpiece is rough, and the size of the inner cavity cannot be accurately controlled. The two process methods are more applied to the forming process of the composite round tube, and the requirement of mass production is difficult to achieve in the forming process of the composite square tube.
The existing forming process is difficult to meet the requirement of mass production for the carbon fiber composite square tube which has high requirements on the roughness and the size of the inner surface and the outer surface and can realize the design of any ply angle.
Disclosure of Invention
Aiming at the problems mentioned in the background technology, the invention aims to provide a thermal expansion forming process of carbon fiber composite square tube silicone rubber, so as to solve the problems mentioned in the background technology.
The technical purpose of the invention is realized by the following technical scheme:
a thermal expansion forming process of silicon rubber for a carbon fiber composite square tube comprises the following steps:
3, paving and pasting the carbon fiber composite square pipe, cutting the prepreg by using a blanking machine, and sequentially weaving the prepreg, the unidirectional tape and the surface layer fabric prepreg on a silicon rubber core mold according to a paving surface until the carbon fiber composite square pipe is paved and pasted;
and 5: making a plurality of square tubes;
and 6, carrying out bag making, curing and demolding according to the general oven forming process of the composite material to finish the manufacturing of the carbon fiber composite material square tube.
Preferably, the silicone rubber square tube core mold in the step 1 is a cured high-elasticity silicone rubber material, so as to ensure the curing and molding process requirement of the medium-temperature cured carbon fiber prepreg within 130 ℃, and the calculation formula of the determination of the silicone rubber square tube core mold is as follows according to the thermal expansion coefficient alpha of silicone rubber and the temperature difference delta t in the curing process:
L square tube ＝l Square tube core mould α Δ t; wherein L is Square tube Is the length of the square tube of silicone rubber, l Square tube core mould Is the length of the silicon rubber square tube core mould.
Preferably, in the step 1, the upper die of the square pipe core die and the lower die of the square pipe core die are connected by a fastener, the upper die of the square pipe core die is provided with a second vent hole and a third bolt hole, the lower die of the square pipe core die is provided with a second glue injection hole and a fourth bolt hole, rubber enters from the second glue injection hole, and the second vent hole discharges air in the cavity until the rubber is discharged from the exhaust hole, which indicates that the cavity is filled with silicon rubber, and then the curing and demolding are performed after the curing.
Preferably, in the step 2, the silicone rubber wedge strip is a cured high-elasticity silicone rubber material, the silicone rubber wedge strip meets the requirements of a curing and molding process of the medium-temperature cured carbon fiber prepreg at a temperature within 130 ℃, and when the size of the silicone rubber wedge strip is determined, the calculation formula is as follows according to the thermal expansion coefficient α of silicone rubber and the temperature difference Δ t in the curing process:
L hollow cavity ＝l Wedge-shaped strip α Δ t; wherein L is Hollow cavity Is the length of the cavity of the silicon rubber wedge strip l Wedge-shaped strip Is the length of the silicone rubber wedge strip.
Preferably, in the step 2, 2 silicone rubber wedge strips are cured at one time by one set of mold in the forming mold of the silicone rubber wedge strips.
Preferably, in the step 5, a plurality of laid and pasted carbon fiber composite square tubes are arranged on a flat plate tool, and the number of the carbon fiber composite square tubes is determined according to the size of the flat plate tool and the number of parts needing one-time curing; the bag making die for the square tubes comprises a flat plate tool, a side pressure equalizing plate, an upper pressure equalizing plate and a partition plate, wherein the flat plate tool is a universal tool, and the side pressure equalizing plate, the upper pressure equalizing plate and the partition plate are stainless steel plates with the thickness of about 1 mm; and 4 silicon rubber wedge-shaped strips are arranged at four corners of each carbon fiber composite square tube to fill the gaps.
In summary, the invention mainly has the following beneficial effects:
1. the uniform pressing plate is used on the surface of the die, compared with the formed square tube made of the carbon fiber composite material, the surface is smooth, the forming quality is good, the wall thickness is uniform, and the subsequent polishing workload is reduced;
2. the paving, sticking and molding of the composite square tube with any layer angle design can be realized, the problem that the layer angle of the traditional composite square tube is limited is solved, and the mechanical property of the carbon fiber material is exerted as much as possible;
3. the curing pressure is provided for the curing process of the carbon fiber square tube through the thermal expansion of the high-elastic silicon rubber, the possibility of defects such as material layering and gaps is reduced due to uniform pressure transmission, auxiliary materials such as a heat-shrinkable sleeve are not needed in the curing process, and the cost is reduced;
4. according to the requirements of the size of an oven, the size of a flat plate tool, the manufacturing quantity and the like, batch manufacturing of a plurality of carbon fiber composite square tubes can be realized at one time;
5. because the silicon rubber has strong elasticity, the square tube is easy to demould and cannot damage square tube parts;
6. the silicon rubber is reused, and the production cost is reduced.
Drawings
FIG. 1 is a drawing of a composite square tube;
FIG. 2 is a die view of a silicone rubber square tube;
FIG. 3 is a schematic view of a silicone rubber square tube core mold;
FIG. 4 is an exploded view of a core mold for a silicone rubber square tube;
FIG. 5 is a silicone rubber wedge bar diagram;
FIG. 6 is a schematic view of a silicone rubber wedge bar core mold;
FIG. 7 is an exploded view of a silicone rubber square tube core mold forming die;
FIG. 8 is a lay-up drawing of a carbon fiber composite square tube;
FIG. 9 is a layout of a carbon fiber composite square tube on a flat plate;
FIG. 10 is an enlarged view taken at A in FIG. 9;
FIG. 11 is a schematic view of a pressure equalizer plate.
Reference numerals: 1. an upper die of the square tube core die forming die; 101. a second vent hole; 102. a third threaded hole; 2. a lower die of the square tube core die forming die; 201. a second glue injection hole; 202. a fourth bolt hole; 3. a silicon rubber square tube core mould; 4. a cylindrical core mold; 401. a first threaded hole; 5. a mold body; 501. a second threaded hole; 6. a carbon fiber composite square tube; 7. a silicon rubber wedge strip; 602. a first glue injection hole; 603. a first vent hole; 8. a side plate; 111. a flat plate tool; 112. a lateral pressure equalizing plate; 113. an upper pressure equalizing plate; 114. a separator.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 11, a thermal expansion forming process of a carbon fiber composite square tube silicone rubber comprises the following steps:
3, paving and pasting the carbon fiber composite square pipe, cutting prepreg by using a blanking machine, sequentially weaving the prepreg, the unidirectional tape and the surface fabric prepreg on the silicon rubber core mold 5 according to a paving surface until the carbon fiber composite square pipe 6 is paved and pasted;
and 5: making a plurality of square tubes;
and 6, carrying out bag making, curing and demolding according to the general oven forming process of the composite material to finish the manufacturing of the carbon fiber composite material square tube.
The silicon rubber square tube core mold 3 in the step 1 is a cured high-elasticity silicon rubber material, so that the curing and forming process requirement of the medium-temperature cured carbon fiber prepreg within 130 ℃ is ensured, and the calculation formula is as follows according to the thermal expansion coefficient alpha of silicon rubber and the temperature difference delta t in the curing process comprehensively for determining the size of the silicon rubber square tube core mold:
L square tube ＝l Square tube core mould α Δ t; wherein L is Square tube Is the length of the square tube of silicone rubber, l Square tube core mould Is the length of the silicon rubber square tube core mould 3.
In the step 1, the square tube core mold upper mold 1 and the square tube core mold lower mold 2 are connected through a fastener, the square tube core mold upper mold 1 is provided with a second vent hole 101 and a third bolt hole 102, the square tube core mold lower mold 2 is provided with a second glue injection hole 201 and a fourth bolt hole 202, rubber enters from the second glue injection hole 201, the second vent hole 101 discharges air in the cavity until the rubber is discharged from the vent hole, which indicates that the cavity is filled with silicone rubber, then the silicone rubber is cured, and demolding is performed after the curing.
In the step 2, the silicone rubber wedge strips 7 are made of cured high-elasticity silicone rubber materials, the silicone rubber wedge strips 7 meet the requirements of a curing and forming process of the medium-temperature cured carbon fiber prepreg at a temperature within 130 ℃, and when the size of the silicone rubber wedge strips 7 is determined, the calculation formula is as follows according to the thermal expansion coefficient alpha of silicone rubber and the temperature difference delta t in the curing process:
L hollow cavity ＝l Wedge-shaped strip α Δ t; wherein L is Hollow cavity Is the length of the cavity of the silicon rubber wedge-shaped strip 7 l Wedge-shaped strip Is the length of the silicon rubber wedge strip 7.
In the step 2, 2 silicone rubber wedge strips 7 are cured at one time by one set of die in a forming die of the silicone rubber wedge strips 7.
In the step 5, a plurality of laid and pasted carbon fiber composite square tubes are arranged on a flat plate tool, and the number of the carbon fiber composite square tubes is determined according to the size of the flat plate tool and the number of parts needing one-time curing; the bag making die for the square tubes comprises a flat plate tool 111, a side pressure equalizing plate 112, an upper pressure equalizing plate 113 and a partition plate 114, wherein the flat plate tool 111 is a universal tool, and the side pressure equalizing plate 112, the upper pressure equalizing plate 113 and the partition plate 114 are stainless steel plates with the thickness of about 1 mm; four corners of each carbon fiber composite square tube 6 are provided with 4 silicon rubber wedge-shaped strips 7 for filling gaps.
The invention mainly has the following beneficial effects: 1. the uniform pressing plate is used on the surface of the die, compared with the formed square tube made of the carbon fiber composite material, the surface is smooth, the forming quality is good, the wall thickness is uniform, and the subsequent polishing workload is reduced; 2. the paving, sticking and molding of the composite square tube with any layer angle design can be realized, the problem that the layer angle of the traditional composite square tube is limited is solved, and the mechanical property of the carbon fiber material is exerted as much as possible; 3. the curing pressure is provided for the curing process of the carbon fiber square tube through the thermal expansion of the high-elastic silicon rubber, the possibility of defects such as material layering and gaps is reduced due to uniform pressure transmission, auxiliary materials such as a heat-shrinkable sleeve are not needed in the curing process, and the cost is reduced; 4. according to the requirements of the size of an oven, the size of a flat plate tool, the manufacturing quantity and the like, batch manufacturing of a plurality of carbon fiber composite square tubes can be realized at one time; 5. because the silicon rubber has strong elasticity, the square tube is easy to demould and cannot damage square tube parts; 6. the silicon rubber is reused, and the production cost is reduced.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A thermal expansion forming process of silicon rubber for a carbon fiber composite square tube is characterized by comprising the following steps: the method comprises the following steps:
step 1, injecting silicon rubber into a silicon rubber square tube core mold, curing and demolding to manufacture a silicon rubber square tube core mold (3), wherein the silicon rubber square tube core mold (3) consists of a square tube core mold forming upper mold (1) and a square tube core mold forming lower mold (2);
step 2, injecting silicon rubber into a silicon rubber wedge strip core mold, demolding after curing to manufacture a silicon rubber wedge strip (7), wherein a forming mold of the silicon rubber wedge strip (7) consists of a cylindrical core mold (4), a mold main body (5) and a side plate (8), and the forming mold of the silicon rubber wedge strip (7) is used for manufacturing the silicon rubber wedge strip (7); the circular rotating core mold (4) is provided with a first threaded hole (401) and is connected with the side plate (8) through a fastener; the die main body (5) is provided with a second threaded hole (501) and is connected with the side plate (8) through a fastener; a first glue injection hole (602) and a first vent hole (603) are formed in the side plate (8), rubber enters from the first glue injection hole (602), the first vent hole (603) discharges air in the cavity until the rubber is discharged from the vent hole, the fact that the cavity is filled with silicon rubber is shown, then curing is carried out, and demolding is carried out after curing;
3, paving and pasting the carbon fiber composite square pipe, cutting prepreg by using a blanking machine, sequentially weaving the prepreg, the unidirectional tape and the surface fabric prepreg on a silicon rubber core mold (5) according to a paving surface until the carbon fiber composite square pipe (6) is paved and pasted;
step 4, repeating the step 3 to finish paving and pasting the required plurality of carbon fiber composite square tubes;
and 5: making a plurality of square tubes;
and 6, carrying out bag making, curing and demolding according to the general oven forming process of the composite material to finish the manufacturing of the carbon fiber composite material square tube.
2. The thermal expansion forming process of the carbon fiber composite square tube silicone rubber as claimed in claim 1, wherein the thermal expansion forming process comprises the following steps: the silicon rubber square tube core mold (3) in the step 1 is a cured high-elasticity silicon rubber material, the curing and forming process requirements of the medium-temperature cured carbon fiber prepreg within 130 ℃ are ensured, the size of the silicon rubber square tube core mold is determined comprehensively according to the thermal expansion coefficient alpha of silicon rubber and the temperature difference delta t in the curing process, and the calculation formula is as follows:
L square tube ＝l Square tube core mould α Δ t, wherein L Square tube Is the length of a silicone rubber square tube, l Square tube core mould Is the length of the silicon rubber square tube core mould (3).
3. The thermal expansion forming process of the carbon fiber composite square tube silicone rubber as claimed in claim 1, wherein the thermal expansion forming process comprises the following steps: in the step 1, an upper square pipe core mold die (1) and a lower square pipe core mold die (2) are connected through a fastener, the upper square pipe core mold die (1) is provided with a second vent hole (101) and a third bolt hole (102), the lower square pipe core mold die (2) is provided with a second glue injection hole (201) and a fourth bolt hole (202), rubber enters from the second glue injection hole (201), the second vent hole (101) discharges air in the cavity until the rubber is discharged from the vent hole, the fact that the cavity is filled with silicon rubber is shown, then curing is carried out, and demolding is carried out after curing.
4. The thermal expansion forming process of the carbon fiber composite square tube silicone rubber as claimed in claim 1, wherein the thermal expansion forming process comprises the following steps: in the step 2, the silicon rubber wedge strip (7) is a cured high-elasticity silicon rubber material, the silicon rubber wedge strip (7) meets the curing and forming process requirement of the medium-temperature cured carbon fiber prepreg within 130 ℃, and when the size of the silicon rubber wedge strip (7) is determined, the calculation formula is as follows comprehensively according to the thermal expansion coefficient alpha of silicon rubber and the temperature difference delta t in the curing process:
L hollow cavity ＝l Wedge-shaped strip α Δ t; wherein L is Hollow cavity Is the length of the cavity of the silicon rubber wedge-shaped strip (7) | Wedge-shaped strip Is the length of the silicon rubber wedge-shaped strip (7).
5. The thermal expansion forming process of the carbon fiber composite square tube silicone rubber as claimed in claim 1, wherein the thermal expansion forming process comprises the following steps: in the step 2, 2 silicon rubber wedge-shaped strips (7) are cured at one time by one set of die in a forming die of the silicon rubber wedge-shaped strips (7).
6. The thermal expansion forming process of the carbon fiber composite square tube silicone rubber as claimed in claim 1, wherein the thermal expansion forming process comprises the following steps: in the step 5, a plurality of laid and pasted carbon fiber composite square pipes are arranged on a flat plate tool, and the number of the carbon fiber composite square pipes is determined according to the size of the flat plate tool and the number of parts needing one-time curing; the bag making die for the square tubes comprises a flat plate tool (111), a side pressure equalizing plate (112), an upper pressure equalizing plate (113) and a partition plate (114), wherein the flat plate tool (111) is a universal tool, and the side pressure equalizing plate (112), the upper pressure equalizing plate (113) and the partition plate (114) are stainless steel plates with the thickness of about 1 mm; and 4 silicon rubber wedge-shaped strips (7) are arranged at four corners of each carbon fiber composite square tube (6) to fill the gaps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211464608.0A CN115742183A (en) | 2022-11-22 | 2022-11-22 | Silicone rubber thermal expansion molding process for carbon fiber composite square tube |
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| CN202211464608.0A CN115742183A (en) | 2022-11-22 | 2022-11-22 | Silicone rubber thermal expansion molding process for carbon fiber composite square tube |
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| CN115742183A true CN115742183A (en) | 2023-03-07 |
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| CN202211464608.0A Pending CN115742183A (en) | 2022-11-22 | 2022-11-22 | Silicone rubber thermal expansion molding process for carbon fiber composite square tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117656538A (en) * | 2024-02-02 | 2024-03-08 | 哈尔滨远驰航空装备有限公司 | Forming die and forming method for special-shaped hollow pipe fitting |
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2022
- 2022-11-22 CN CN202211464608.0A patent/CN115742183A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117656538A (en) * | 2024-02-02 | 2024-03-08 | 哈尔滨远驰航空装备有限公司 | Forming die and forming method for special-shaped hollow pipe fitting |
| CN117656538B (en) * | 2024-02-02 | 2024-04-26 | 哈尔滨远驰航空装备有限公司 | Forming die and forming method for special-shaped hollow pipe fitting |
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