CN107627629B - Molding equipment tool and molding method for controlling thickness and fiber volume fraction of composite material - Google Patents
Molding equipment tool and molding method for controlling thickness and fiber volume fraction of composite material Download PDFInfo
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- CN107627629B CN107627629B CN201710899387.2A CN201710899387A CN107627629B CN 107627629 B CN107627629 B CN 107627629B CN 201710899387 A CN201710899387 A CN 201710899387A CN 107627629 B CN107627629 B CN 107627629B
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Abstract
The invention provides a forming equipment tool for controlling the thickness and the fiber volume fraction of a composite material and a forming method, wherein the tool comprises a bottom plate, a plurality of metal supports, a forming mold, an offset molded surface equalizing plate, silicon rubber, a glue injection pipeline, a glue outlet pipeline, a vacuum bag, a flow guide net, a fixing pin and a positioning pin, wherein the metal supports adopt inverted L-shaped or T-shaped supports, one end of each metal support is connected with the bottom plate through a fastening bolt, the other end of each metal support is provided with a universal bolt, the forming mold is arranged on the bottom plate, the metal supports are arranged around the forming mold, the forming mold is sequentially provided with a first demolding cloth, a second demolding cloth, a vacuum bag, the silicon rubber and the offset molded surface equalizing plate, and the glue injection pipeline and the glue outlet pipeline are arranged between the; the invention can manufacture parts with different thicknesses and parts with required fiber volume fractions, only needs one set of mould equipment cost, greatly reduces the production cost, has adjustability and can carry out production adjustment according to production requirements.
Description
Technical Field
The invention relates to a forming equipment tool and a forming method for controlling the thickness and the fiber volume fraction of a composite material.
Background
The composite material is used as a novel high-performance material and is widely applied to aerospace and industrial application, in a composite material forming process, liquid forming is used as one important forming process, process optimization and improvement of mechanical properties of a workpiece are particularly important, in a traditional liquid forming process, a workpiece formed by a VARI process is thick in thickness and low in fiber volume content, so that the mechanical properties of the workpiece are greatly reduced, and in a RTM process, although the thickness and the fiber volume fraction of the workpiece can be controlled, the equipment cost is high, the thickness of the workpiece is single, and particularly, multiple sets of molds are needed for workpieces with the same profile and different thicknesses, so that the cost is overhigh.
Disclosure of Invention
The invention aims to provide a forming equipment tool and a forming method for controlling the thickness and the fiber volume fraction of a composite material, and solves the problems that in the prior art, the equipment cost is high, the thickness of a workpiece is single, and particularly, multiple sets of dies are needed in workpieces with the same molded surface and different thicknesses, so that the cost is overhigh.
The technical solution of the invention is as follows:
a molding equipment tool for controlling the thickness and the fiber volume fraction of a composite material comprises a bottom plate, a plurality of metal supports, a molding die, an offset profile uniform pressure plate, silicon rubber, a glue injection pipeline, a glue outlet pipeline, a vacuum bag, a flow guide net, a fixing pin and a positioning pin, wherein the metal supports are inverted L-shaped or T-shaped supports, one end of each metal support is connected with the bottom plate through a fastening bolt, the other end of each metal support is provided with a universal bolt, the molding die is arranged on the bottom plate, the metal supports are arranged around the molding die, the molding die is sequentially provided with a first demolding cloth, a second demolding cloth, the vacuum bag, the silicon rubber and the offset profile uniform pressure plate, the universal bolts are arranged above the offset profile uniform pressure plate, the glue injection pipeline and the glue outlet pipeline are arranged between the vacuum bag and the second demolding cloth, the glue injection pipeline and the glue outlet pipeline are respectively arranged on two inner sides of the vacuum bag, the fixed pins sequentially penetrate through the vacuum bag, the second demolding cloth and the first demolding cloth and then penetrate into the forming mold, and the positioning pins sequentially penetrate through the offset molded surface pressure equalizing plate, the silicon rubber, the vacuum bag, the second demolding cloth and the first demolding cloth and then penetrate into the forming mold.
Furthermore, the preforming body is arranged between the first demolding cloth and the second demolding cloth.
Furthermore, the flow guide net is made of a nylon material.
Furthermore, the first demolding cloth adopts demolding cloth with glue.
A forming method using the forming equipment tool for controlling the thickness and the fiber volume fraction of the composite material comprises the following steps:
a. manufacturing a forming mold, wherein the forming mold is a male mold, a scraper tool is used on an offset molded surface pressure equalizing plate, proportioned unvulcanized silicone rubber is uniformly coated on the inner side of the molded surface, the molded surface is placed in a curing furnace, and the silicone rubber is cured and shaped according to a silicone rubber curing system to prepare a silicone rubber pad with a corresponding thickness; or vulcanized silicon rubber is used and is glued into the required inner molded surface;
b. preparing a required preformed body, specifically, cutting a carbon fiber fabric according to a blanking drawing by using a cutting machine, paving and pasting the fabric with a shaping agent on a forming die, sequentially paving an isolation film, demolding cloth and a vacuum bag on the fabric, and sealing the vacuum bag by adopting a sealing rubber strip; placing the prefabricated body after bag making into a curing oven for heat setting, wherein the heat setting ensures that the vacuum degree is more than 920mbar, the setting temperature is 130 +/-5 ℃, the setting time is 30min, and after the setting is finished and the temperature is cooled to be below 60 ℃, trimming is carried out to obtain a preformed body;
c. the VARI process molding of the composite material workpiece is specifically that a first demolding cloth, a trimmed preforming body, a second demolding cloth and a flow guide net are sequentially laid on a molding die, a glue injection pipeline and a glue outlet pipeline are placed, and a bag is made; detecting the whole air tightness of the die after bag making, wherein the whole vacuum is required to be over 920mbar, and the 5min pressure drop is not more than 20 mbar; fixing four metal brackets on the bottom plate through fastening bolts, and respectively installing four universal bolts on the metal brackets; installing a fixed pin with required thickness on the forming die, installing an offset profile pressure equalizing plate, and rotating a universal bolt to apply force to the offset profile pressure equalizing plate; opening the glue injection pipeline for injecting glue, and continuing to rotate the universal bolt for fastening and curing when the glue injection is finished;
d. demoulding the composite materials to obtain a finished product.
Further, in the step c, the offset molded surface pressure equalizing plate is installed, specifically, a fixed pin is placed in a pin hole of the forming die; and then placing an offset molded surface pressure equalizing plate, and placing positioning pins on the offset molded surface pressure equalizing plate and the forming die to position the two.
The invention has the beneficial effects that: according to the molding equipment tool and the molding method for controlling the thickness and the fiber volume fraction of the composite material, the VARI molding process is optimized, workpieces with different thicknesses and workpieces with required fiber volume fractions can be manufactured through the equipment tool, only one set of equipment cost is needed for a mold, the production cost is greatly reduced, the adjustability is realized, and the production adjustment can be carried out according to production needs.
Drawings
FIG. 1 is a schematic structural diagram of a tooling of a molding apparatus for controlling the thickness and fiber volume fraction of a composite material according to an embodiment of the present invention;
FIG. 2 is a schematic view of an embodiment of a uniform offset profile platen and a forming die;
wherein: 1-forming die, 2-metal bracket, 3-universal bolt, 4-vacuum bag, 5-glue injection pipeline, 6-flow guide net, 7-offset molded surface pressure equalizing plate, 8-silicon rubber, 9-glue outlet pipeline, 10-demoulding cloth 1, 11-demoulding cloth 2, 12-bottom plate, 13-positioning pin, 14-fixing pin, 15-preforming body and 16-fastening bolt.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Examples
A molding equipment tool for controlling the thickness and the fiber volume fraction of a composite material is shown in figure 1 and comprises a bottom plate 12, a plurality of metal supports 2, a molding mold 1, an offset molded surface pressure equalizing plate 7, silicon rubber 8, a glue injection pipeline 5, a glue outlet pipeline 9, a vacuum bag 4, a flow guide net 6, fixing pins 14 and positioning pins 13, wherein the metal supports 2 are inverted L-shaped or T-shaped supports, one end of each metal support 2 is connected with the bottom plate 12 through a fastening bolt 16, the other end of each metal support 2 is provided with a universal bolt 3, the molding mold 1 is arranged on the bottom plate 12, the metal supports 2 are arranged around the molding mold 1, a first demolding cloth 10, a second demolding cloth 11, the vacuum bag 4, the silicon rubber 8 and the offset molded surface pressure equalizing plate 7 are sequentially arranged on the molding mold 1, the universal bolt 3 is arranged above the offset molded surface pressure equalizing plate 7, the glue injection pipeline 5 and the glue outlet pipeline 9 are arranged between, and the glue injection pipeline 5 and the glue outlet pipeline 9 are respectively arranged at two sides of the interior of the vacuum bag 4, a flow guide net 6 is arranged between the glue injection pipeline 5 and the second demolding cloth 11, as shown in fig. 2, a fixing pin 14 penetrates into the forming mold 1 after sequentially passing through the vacuum bag 4, the second demolding cloth 11 and the first demolding cloth 10, and a positioning pin 13 penetrates into the forming mold 1 after sequentially passing through the offset molded surface pressure equalizing plate 7, the silicon rubber 8, the vacuum bag 4, the second demolding cloth 11 and the first demolding cloth 10.
This kind of control combined material thickness and fibre volume fraction's former frock through equipment frock, can make the finished piece of different thickness and required fibre volume fraction, and mould equipment cost only need one set, has reduceed manufacturing cost greatly to have the controllability, can produce according to production needs and adjust.
The connecting and installing sequence of the forming equipment tool for controlling the thickness and the fiber volume fraction of the composite material is that a preformed body 15 is prepared firstly, and the preformed body 15 is placed between a first demoulding cloth 10 and a second demoulding cloth 11 on a forming mould 1; laying auxiliary materials such as a vacuum bag 4, a flow guide net 6 and silicon rubber 8; then, laying and connecting pipelines, including a glue injection pipeline 5 and a glue outlet pipeline 9; preparing silicon rubber 8 which is consistent with the offset molded surface pressure equalizing plate 7 and sticking the silicon rubber 8 and the offset molded surface pressure equalizing plate 7 together; the device comprises a metal support 2 for mounting equipment tools, universal bolts 3, positioning pins 13, fixing pins 14 and an offset profile pressure equalizing plate 7.
In the embodiment, multiple layers of release cloth and release cloth with glue can be added on the upper surface and the lower surface of the preformed body 15, and the release cloth with glue are used for absorbing surplus resin and controlling the apparent quality of a finished piece in manufacturing and molding. The flow guide net 6 is made of soft PA material, and the size and the shape of the flow guide net are approximately consistent with the apparent shape of the workpiece. The flow guiding net 6 is cut into two parts, one part is used as a flow guiding medium, and the other part is used as a filling medium.
In the embodiment, the offset profile equalizing plate 7 is manufactured by offsetting the outer profile of the product. The height of the offset profile equalizing plate 7 from the workpiece is controlled by a fixed pin 14. The offset molded surface pressure equalizing plate 7 and the workpiece have a layer of silicon rubber 8, and the actual thickness of the workpiece is interacted with each other by the three. The external force of the offset profile pressure equalizing plate 7 is applied by the universal bolt 3.
The embodiment comprises the steps of cutting a carbon fiber fabric by using a cutting machine, laying a required fabric on a forming die 1 to prepare a preformed body 15, laying an auxiliary material to make a bag, mounting an equipment tool on the forming die 1, placing a required fixing pin 14, a required offset profile uniform pressure plate 7 and silicon rubber 8, rotating a universal bolt 3 to enable the offset profile uniform pressure plate 7 to reach a required actual height, and performing a glue injection curing process.
A forming method using the forming equipment tool for controlling the thickness and the fiber volume fraction of the composite material comprises the following steps:
a. manufacturing a forming die 1, wherein the forming die 1 is a male die, uniformly coating proportioned unvulcanized silicone rubber 8 on the inner side of a molded surface by using a scraper tool on an offset molded surface pressure equalizing plate 7, placing the molded surface in a curing furnace, and curing and shaping the silicone rubber 8 according to a curing system of the silicone rubber 8 to prepare a silicone rubber pad with a corresponding thickness; or using vulcanized silicon rubber 8 to glue the vulcanized silicon rubber into the required inner molded surface;
b. preparing a required preformed body 15, specifically, cutting a carbon fiber fabric according to a blanking drawing by using a cutting machine, laying the fabric with a setting agent on a forming die 1, laying an isolation film, demolding cloth and a vacuum bag 4 on the fabric in sequence, and sealing the vacuum bag 4 by adopting a sealing rubber strip; placing the prefabricated body after bag making into a curing oven for heat setting, wherein the heat setting ensures that the vacuum degree is more than 920mbar, the setting temperature is 130 +/-5 ℃, the setting time is 30min, and after the setting is finished and the temperature is cooled to be below 60 ℃, trimming is carried out to obtain a preformed body 15;
c. the VARI process molding of the composite material part is specifically that a first demolding cloth 10, a trimmed preforming body 15, a second demolding cloth 11 and a flow guide net 6 are sequentially laid on a molding die 1, a glue injection pipeline 5 and a glue outlet pipeline 9 are placed, and a bag is made; detecting the whole air tightness of the die after bag making, wherein the whole vacuum is required to be over 920mbar, and the 5min pressure drop is not more than 20 mbar; fixing four metal brackets 2 on a bottom plate 12 through fastening bolts 16, and respectively installing four universal bolts 3 on the metal brackets 2; a fixed pin 14 with required thickness is arranged on the forming die 1, the offset profile pressure equalizing plate 7 is placed, and the universal bolt 3 is rotated to apply force to the offset profile pressure equalizing plate 7; opening the glue injection pipeline 5 for injecting glue, and continuing to rotate the universal bolt 3 for fastening and curing when the glue injection is finished;
example the order of placing the offset profile equalizing plate 7 is in the following order: firstly, a fixed pin 14 is placed in a pin hole of a forming die 1; and then placing an offset molded surface pressure equalizing plate 7, and placing a positioning pin 13 on the offset molded surface pressure equalizing plate 7 and the forming die 1 to position the two.
d. Demoulding the composite materials to obtain a finished product. The method specifically comprises the following steps:
d1, rotating the universal bolt 3, and correspondingly removing equipment tools such as the universal bolt 3, the metal bracket 2, the pressure equalizing plate 7 and the like;
d2, removing auxiliary materials;
e. and (6) inspecting, packaging and warehousing.
According to the forming equipment tool and the forming method for controlling the thickness and the fiber volume fraction of the composite material, optimization is performed on a VARI forming process, the required actual thickness can be accurately controlled, the composite material with the required thickness and the required fiber volume fraction can be manufactured by adjusting the pins with the fixed length and the silicon rubber 8, and the equipment tool is convenient to assemble and disassemble.
Besides the above embodiments, the patented product of the invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present patent.
Claims (3)
1. The utility model provides a control combined material thickness and fibre volume fraction's former frock which characterized in that: the forming die comprises a bottom plate, a plurality of metal supports, a forming die, an offset molded surface pressure equalizing plate, silicon rubber, a glue injection pipeline, a glue outlet pipeline, a vacuum bag, a flow guide net, a fixing pin and a positioning pin, wherein the metal supports are inverted L-shaped or T-shaped supports, one end of each metal support is connected with the bottom plate through a fastening bolt, a universal bolt is arranged at the other end of each metal support, the forming die is arranged on the bottom plate, the metal supports are arranged around the forming die, a first demolding cloth, a second demolding cloth, the vacuum bag, the silicon rubber and the offset molded surface pressure equalizing plate are sequentially arranged on the forming die, the universal bolt is arranged above the offset molded surface pressure equalizing plate, the glue injection pipeline and the glue outlet pipeline are respectively arranged between the vacuum bag and the second demolding cloth, the glue injection pipeline and the glue outlet pipeline are respectively arranged at two inner sides of the vacuum bag, the flow guide nets are arranged between the glue injection, Penetrating the silicon rubber into a forming die; the flow guide net is made of a nylon material, and the first demolding cloth is demolding cloth with glue;
a forming step:
a. manufacturing a forming mold, wherein the forming mold is a male mold, a scraper tool is used on an offset molded surface pressure equalizing plate, proportioned unvulcanized silicone rubber is uniformly coated on the inner side of the molded surface, the molded surface is placed in a curing furnace, and the silicone rubber is cured and shaped according to a silicone rubber curing system to prepare a silicone rubber pad with a corresponding thickness; or vulcanized silicon rubber is used and is glued into the required inner molded surface;
b. preparing a required preformed body, specifically, cutting a carbon fiber fabric according to a blanking drawing by using a cutting machine, paving and pasting the fabric with a shaping agent on a forming die, sequentially paving an isolation film, demolding cloth and a vacuum bag on the fabric, and sealing the vacuum bag by adopting a sealing rubber strip; placing the prefabricated body after bag making into a curing oven for heat setting, wherein the heat setting ensures that the vacuum degree is more than 920mbar, the setting temperature is 130 +/-5 ℃, the setting time is 30min, and after the setting is finished and the temperature is cooled to be below 60 ℃, trimming is carried out to obtain a preformed body;
c. the VARI process molding of the composite material workpiece is specifically that a first demolding cloth, a trimmed preforming body, a second demolding cloth and a flow guide net are sequentially laid on a molding die, a glue injection pipeline and a glue outlet pipeline are placed, and a bag is made; detecting the whole air tightness of the die after bag making, wherein the whole vacuum is required to be over 920mbar, and the 5min pressure drop is not more than 20 mbar; fixing four metal brackets on the bottom plate through fastening bolts, and respectively installing four universal bolts on the metal brackets; installing a fixed pin with required thickness on the forming die, installing an offset profile pressure equalizing plate, and rotating a universal bolt to apply force to the offset profile pressure equalizing plate; opening the glue injection pipeline for injecting glue, and continuing to rotate the universal bolt for fastening and curing when the glue injection is finished; in the step c, the offset molded surface pressure equalizing plate is installed, namely, a fixed pin is placed in a pin hole of a forming die; placing an offset molded surface pressure equalizing plate, and placing positioning pins on the offset molded surface pressure equalizing plate and the forming die to position the two positions;
d. demoulding the composite materials to obtain a finished product.
2. The molding apparatus tooling of claim 1 for controlling composite thickness and fiber volume fraction, wherein: the first demolding cloth and the second demolding cloth are provided with preformed bodies.
3. A molding method using the molding equipment tool for controlling the thickness and the fiber volume fraction of the composite material according to any one of claims 1 to 2, characterized by comprising the following steps:
a. manufacturing a forming mold, wherein the forming mold is a male mold, a scraper tool is used on an offset molded surface pressure equalizing plate, proportioned unvulcanized silicone rubber is uniformly coated on the inner side of the molded surface, the molded surface is placed in a curing furnace, and the silicone rubber is cured and shaped according to a silicone rubber curing system to prepare a silicone rubber pad with a corresponding thickness; or vulcanized silicon rubber is used and is glued into the required inner molded surface;
b. preparing a required preformed body, specifically, cutting a carbon fiber fabric according to a blanking drawing by using a cutting machine, paving and pasting the fabric with a shaping agent on a forming die, sequentially paving an isolation film, demolding cloth and a vacuum bag on the fabric, and sealing the vacuum bag by adopting a sealing rubber strip; placing the prefabricated body after bag making into a curing oven for heat setting, wherein the heat setting ensures that the vacuum degree is more than 920mbar, the setting temperature is 130 +/-5 ℃, the setting time is 30min, and after the setting is finished and the temperature is cooled to be below 60 ℃, trimming is carried out to obtain a preformed body;
c. the VARI process molding of the composite material workpiece is specifically that a first demolding cloth, a trimmed preforming body, a second demolding cloth and a flow guide net are sequentially laid on a molding die, a glue injection pipeline and a glue outlet pipeline are placed, and a bag is made; detecting the whole air tightness of the die after bag making, wherein the whole vacuum is required to be over 920mbar, and the 5min pressure drop is not more than 20 mbar; fixing four metal brackets on the bottom plate through fastening bolts, and respectively installing four universal bolts on the metal brackets; installing a fixed pin with required thickness on the forming die, installing an offset profile pressure equalizing plate, and rotating a universal bolt to apply force to the offset profile pressure equalizing plate; opening the glue injection pipeline for injecting glue, and continuing to rotate the universal bolt for fastening and curing when the glue injection is finished; in the step c, the offset molded surface pressure equalizing plate is installed, namely, a fixed pin is placed in a pin hole of a forming die; placing an offset molded surface pressure equalizing plate, and placing positioning pins on the offset molded surface pressure equalizing plate and the forming die to position the two positions;
d. demoulding the composite materials to obtain a finished product.
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| CN110588016B (en) * | 2019-09-17 | 2022-05-06 | 成都飞机工业（集团）有限责任公司 | Forming tool and forming method for composite material integrated joint |
| CN114905770B (en) * | 2021-02-08 | 2024-03-22 | 中国航发商用航空发动机有限责任公司 | Blade forming method and mould |
| GB2604126A (en) * | 2021-02-24 | 2022-08-31 | Airbus Operations Ltd | Reinforced holes |
| CN113954391B (en) * | 2021-10-13 | 2024-03-12 | 上海复合材料科技有限公司 | S-shaped composite material air inlet passage forming die and preparation method thereof |
| CN117021614B (en) * | 2023-10-10 | 2023-12-15 | 河北安泰富源安全设备制造有限公司 | Forming method of protective shell for observation window |
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| CN104441696A (en) * | 2014-09-22 | 2015-03-25 | 成都飞机工业（集团）有限责任公司 | Manufacture method of special-shaped composite material rib |
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