CN203945700U - Carbon Fiber Vacuum Forming Mold with Overflow Channel - Google Patents

Abstract

The utility model provides a carbon fiber vacuum forming die of utensil overflow way, include: a lower die and an upper die; the lower die is provided with a die cavity, an overflow channel is arranged on the upper surface of the lower die and surrounds the die cavity, the lower die is provided with at least one air channel, and the air channel is communicated with the overflow channel; a carbon fiber sheet impregnated with flowing resin is placed in the mold cavity, an absorber is placed in the overflow channel, and the absorber is made of a material with absorbability and air permeability; the lower surface of the upper die is provided with a convex profiling block, the shape of the profiling block conforms to the die cavity, and when the upper die is combined with the lower die, the profiling block enters the die cavity to shape the carbon fiber sheet. The excess impregnated resin of the carbon fiber sheet can overflow into the overflow channel and be absorbed by the absorber.

Description

Carbon Fiber Vacuum Forming Mold with Overflow Channel

technical field

The utility model relates to the field of forming mold design, in particular to a carbon fiber or glass fiber forming mold. the

Background technique

Substrates woven with carbon fibers (or glass fibers) have been widely used in computer, electronic and communication products. The molding method of carbon fiber products is: slowly heat the carbon fiber prepreg to a certain temperature, keep it for 40-80 minutes, and then cool it naturally. The total molding time should be at least 60 minutes. Excessive molding time is not conducive to the improvement of production efficiency. Moreover, during the high-temperature and high-pressure molding process, the fluidity of the resin impregnated in the fiber cloth before solidification will cause a little resin to flow down, resulting in uneven resin formation on the surface. In some cases, it is necessary to evenly modify the surface by surface spraying. the

In order to overcome the above problems, the industry proposes to use wind pressure and vacuum technology to shape the carbon fiber prepreg in the mold, make the carbon fiber prepreg conform to the shape of the mold cavity through wind pressure, and remove the resin existing in the mold cavity through vacuum technology. The gas in the product can improve the surface quality of the product, reduce the porosity of the product and increase the mechanical properties of the product. However, the resin impregnated in the carbon fiber has fluidity before it is solidified. During the vacuuming process, the fluid resin flows under the action of vacuum suction, which causes the distribution of the resin on the carbon fiber sheet to become uneven, even A small portion of the resin is drawn into the vacuum suction channels or components. the

Utility model content

The technical problem to be solved by the utility model is that the carbon fiber sheet impregnated with flowing resin undergoes a vacuuming process in the mould. Because the fluidity of the resin before solidification makes it flow under the action of vacuum suction force, the resin on the carbon fiber sheet flows. The distribution becomes uneven and even gets sucked into the vacuum suction holes or components. This problem also occurs in the resin transfer molding (Resin Transfer Molding, RTM) technology, when the resin is injected into the cavity through the channel of the mold and begins to impregnate the carbon fiber sheet, the flowing resin will also be sucked into the vacuum due to the vacuum suction force. Suction holes or components. the

The technical solution adopted by the utility model to solve the above problems is to provide a carbon fiber vacuum forming mold with an overflow channel, which includes: a lower mold and an upper mold that can be combined or separated from the upper surface of the lower mold;

The central region of the upper surface of the lower mold is provided with a downwardly recessed mold cavity, and an overflow channel is arranged on the upper surface of the lower mold and surrounds the mold cavity; the lower mold is provided with at least one air channel, and the air channel is connected with the mold cavity. The overflow channel is connected; a carbon fiber sheet impregnated with flowable resin is placed in the mold cavity, and an absorber is placed in the overflow channel, and the absorber is a material with absorbent and air-permeable pores;

The lower surface of the upper mold is provided with a protruding profiling block whose shape conforms to the mold cavity. When the upper mold and the lower mold are combined, the profiling block enters the mold cavity, and the upper mold Cover the overflow. the

Furthermore, the longitudinal depth of the overflow channel is greater than that of the mold cavity. the

The overflow channel is adjacent to the mold cavity. the

The distance between the two adjacent sides is between 1mm and 3mm. the

The beneficial effect of the utility model is to overcome the fact that the carbon fiber sheet impregnated with flowing resin undergoes a vacuuming process in the mould, and the fluidity of the resin before solidification makes it flow under the action of vacuum suction force, resulting in the distribution of the resin on the carbon fiber sheet become uneven, or even get sucked into the vacuum suction holes or components. the

The utility model absorbs the excess impregnated resin overflowing the carbon fiber sheet outside the mold cavity through the overflow channel and the absorber therein, and the overflowed resin is absorbed by the absorber, so it will not be sucked into the vacuum suction channel or components middle. Since the absorber has air-permeable pores, it does not affect the vacuuming operation. the

The excess impregnated resin of the carbon fiber sheet can overflow into the overflow channel, so that the impregnated resin amount of the carbon fiber sheet is sufficient and even. the

The resin absorbed by the absorber in the overflow channel is cured when the mold is heated, so that the original soft absorber is hardened due to the curing of the resin, and the hardened absorber can be easily taken out from the overflow channel. the

The hardened resin can leave the overflow channel along with the absorber, so when the absorber is taken out, the residual resin in the overflow channel is also removed, eliminating the man-hour of cleaning the residual resin in the overflow channel. the

Description of drawings

Fig. 1 is the three-dimensional exploded view of the mold of the present utility model. the

Fig. 2 is the combined sectional view of the mold of the present utility model. the

Fig. 3 is one of the schematic cross-sectional views of the carbon fiber sheet impregnated with flowable resin and the absorber in the mold of the utility model. the

Fig. 4 is the second schematic cross-sectional view of the carbon fiber sheet impregnated with flowing resin and the absorber in the mold of the utility model. the

Fig. 5 is one of the plane schematic diagrams of the mold of the present invention applied to a rapid heating vacuum blister machine. the

Fig. 6 is the second schematic plan view of the application of the mold of the present utility model to a rapid heating vacuum blister machine. the

Reference numerals: 10-lower mold; 11-mould cavity; 12-overflow channel; 13-air channel; 20-upper mold; 21-profile block; 30-carbon fiber sheet impregnated with flowing resin; 40-absorber; 50-rapid heating vacuum blister machine; 51-platform; 52-film heater; 53-suction channel; 54-vacuum suction switch; 55-ventilation channel; 56-vacuum release switch; 60-elastic pressurization Structure; 61-elastic diaphragm; 62-frame; 63-airtight strip; 64-pivot structure

Detailed ways

In order to illustrate the central idea represented by the utility model, it is expressed with specific embodiments. Various objects in the embodiments are drawn according to proportions, sizes, deformations or displacements suitable for illustration, rather than drawn according to the proportions of actual components, which are described first. And in the following description, similar components are denoted by the same numerals. the

As shown in Fig. 1 to Fig. 4, the carbon fiber vacuum forming mold with spillway of the utility model includes: a lower mold 10 and an upper mold 20 that can be combined or separated from the lower mold 10;

The central region of the upper surface of the lower mold 10 is provided with a downwardly recessed mold cavity 11, an overflow channel 12 is located on the upper surface of the lower mold 10 and surrounds the mold cavity 11, and the depth of the overflow channel 12 is greater than the mold cavity 11. mold cavity 11; the overflow channel 12 is adjacent to the mold cavity 11, and the distance between the two adjacent sides is between 1mm-3mm; the lower mold 10 is provided with at least one air channel 13, and the air channel 13 and the overflow channel 12 Connected; a carbon fiber sheet 30 impregnated with flowing resin is placed in the mold cavity 11, and an absorber 40 is placed in the overflow channel 12. The absorber 40 is a material with absorbency and air-permeable pores, such as a sheet-shaped cotton material. the

The lower surface of the upper mold 20 is provided with a protruding profiling block 21 whose shape matches the die cavity 11. In hole 11. the

In the hot-press vacuum forming process, the upper mold 20 is combined with the lower mold 10, the profiling block 21 and the mold cavity 11 pre-press the carbon fiber sheet 30 impregnated with flowable resin, the lower mold 10 is heated to a predetermined temperature, In order to solidify the resin impregnated in the carbon fiber sheet 30 and fix the shape of the carbon fiber sheet 30 . Before the resin is cured, the fluidity of the resin and the pre-pressure of the profiling block 21 will cause excess resin impregnated in the carbon fiber sheet 30 to overflow from the mold cavity 11 to the overflow channel 12 and be absorbed by the absorber 40 . The lower mold 10 is heated to a predetermined temperature and maintained for a predetermined time, and the resin impregnated in the carbon fiber sheet 30 is cured, so that the carbon fiber sheet 30 is molded according to the shape of the profiling block 21 and the cavity 11 . Simultaneously, the resin absorbed by the absorber 40 in the overflow channel 12 is also cured together, so that the originally soft absorber 40 hardens due to the curing of the resin. the

During the above-mentioned thermoforming process, the air between the upper mold 20 and the lower mold 10 is drawn away through the air channel 13 in conjunction with the vacuuming operation, thereby eliminating air bubbles in the carbon fiber sheet impregnated with resin. Because the absorber 40 has air-permeable pores, when the air between the upper mold 20 and the lower mold 10 is sucked out through the air channel 13 of the lower mold 10 by vacuuming, the absorber 40 will not hinder the passage of air between the molds. exclude. When the vacuuming operation is carried out, because the resin impregnated by the carbon fiber sheet has overflowed to the overflow channel 12 in advance, the resin impregnated by the carbon fiber sheet 30 has basically been evenly distributed, and the excess resin is due to overflowing. The channel 12 is absorbed by the absorber 40, so it will not be sucked into the vacuum suction hole or component along with the vacuum airflow. the

The utility model is specially designed that this overflow channel 12 is close to this mold cavity 11, is to make the resin overflowing in the mold cavity 11 easily flow into this overflow channel 12, and avoids it being diffused between the upper mold 20 and the lower mold 10. The depth of the overflow channel 12 is greater than that of the mold cavity 11 so that the resin overflowing into the overflow channel 12 can settle faster without flowing back into the mold cavity 11 . the

After the hot-press vacuum forming process is completed, the mold is opened to take out the carbon fiber sheet molded product. The above-mentioned hardened absorber 40 can be easily taken out from the overflow channel 12, and the absorber 40 is also removed at the same time. The residual resin in the overflow channel 12 eliminates the man-hour of cleaning the residual resin in the overflow channel. the

As shown in Fig. 5 and Fig. 6, the mold of the present utility model is applied to a schematic plan view of a rapid heating vacuum forming machine 50. After the lower mold 10 and the upper mold 20 are combined, they are placed on the platform 51 of the rapid heating vacuum forming machine 50 On the platform 51, a thin-film heater 52 is embedded to control the rapid heating and cooling of the platform 51 and the mold of the utility model on it. The platform 51 is provided with a suction channel 53, and the suction channel 53 communicates with the lower mold 10 The air channel 13, the suction hole 53 is controlled on or off by a vacuum suction switch 54, and the vacuum suction switch 14 is connected to a vacuum suction device (not shown). This platform 51 is provided with a vent hole 55 in addition, and this vent hole 55 communicates with the surface of this platform 51, and this vent hole 55 is controlled conducting or closing by a vacuum release switch 56, and this vacuum release switch 56 connects an air introduction device ( not shown). the

The rapid heating vacuum molding machine 50 further has an elastic pressurizing structure 60 , and the elastic pressing structure 60 includes an elastic membrane 61 and a frame 62 combined with the elastic membrane 61 to maintain the tension of the membrane. The elastic diaphragm 61 is made of silica gel material, with a thickness of about 1mm-2mm, and a heat-resistant temperature of 300°C. The elastic pressurized structure 60 can be combined or separated relative to the platform 51 . A known pivot structure 64 can combine one side of the frame 62 with one side of the platform 51 , so that the elastic pressurizing structure 60 can be combined or separated from the platform 51 in a manual flipping manner. The elastic pressurized structure 60 can also be installed above the platform 51 through the frame body, and the elastic pressurized structure 60 can be combined with or separated from the platform 51 through the drive of the power cylinder. An airtight strip 63 is provided on the periphery of the frame 62 and the platform 51 to keep airtight when they are combined. the

When the elastic pressing structure 60 is combined with the platform 51 , the elastic membrane 61 completely covers the upper mold 20 . When the vacuuming operation starts, in addition to removing the air between the upper mold 20 and the lower mold 10, the space between the platform 51 and the elastic diaphragm 61 is also vacuumed into a negative pressure state, and the elastic The diaphragm 61 deforms along the shape of the lower mold 10 and the upper mold 20 to form a pressure on the upper mold 20 and exert an evenly distributed pressure on the carbon fiber sheet 30 impregnated with flowing resin between the mold cavity 11 and the profiling block 21. The strength makes the carbon fiber sheet shaped according to the mold cavity 11 and the profiling block 21, and after the resin is solidified, a carbon fiber finished product is formed. Mold opening after molding, first this vacuum suction switch 54 and this vacuum suction device are closed, then open this vacuum release switch 56 and the air introduction device, and air is introduced between the platform 51 and the elastic diaphragm 61, and the air is also permeable. The air channel 13 enters between the upper mold 20 and the lower mold 10 to release the negative pressure state, so that the elastic pressurized structure 60 can be separated from the platform 51 . the

Claims (4)

1. A carbon fiber vacuum forming mold with an overflow channel, is characterized in that it comprises: A lower mold and an upper mold that can be relatively combined or separated from the lower mold; The central area of the upper surface of the lower mold is provided with a downwardly recessed mold cavity, an overflow channel is arranged on the upper surface of the lower mold and surrounds the mold cavity, and the lower mold is provided with at least one air passage, which is connected with the air passage. the overflow channel communicates; A carbon fiber sheet impregnated with flowable resin is placed in the mold cavity; An absorber is placed in the overflow channel, and the absorber is a material with absorbent and air-permeable pores; The lower surface of the upper mold is provided with a protruding profiling block whose shape conforms to the mold cavity; when the upper mold is combined with the lower mold, the profiling block enters the mold cavity, and the upper mold The mold covers the overflow channel. 2 . The carbon fiber vacuum forming mold with an overflow channel according to claim 1 , wherein the longitudinal depth of the overflow channel is greater than that of the mold cavity. 3 . 3 . The carbon fiber vacuum forming mold with an overflow channel according to claim 1 , wherein the overflow channel is adjacent to the mold cavity. 4 . 4 . The carbon fiber vacuum forming mold with an overflow channel according to claim 3 , wherein the distance between two adjacent sides is between 1 mm and 3 mm.