TWM510848U - Rapid resin injection molding transfer device - Google Patents

Description

Fast resin transfer molding device

The present invention relates to a resin transfer molding device, and more particularly to a pressure-increasing resin transfer molding device for processing fiber reinforcing materials.

Due to the light weight and high mechanical strength of fiber composites made of fibers and resins, such fiber composite materials are widely used by various industries. The common fiber composite process consists of several methods, such as spraying, hand-filling and resin-transfer molding. However, the spraying method and the hand-filling method are mainly manual operations, which have low production efficiency and are easily released due to the process. The organic compound will endanger the health of the on-site operators; the resin transfer molding method is suitable for automated processes, but for large-scale finished products with high fiber content, the time for resin injection into the fiber is still too long. If it is to be hardened by a furnace, it needs to be purchased. Large high temperature furnaces, so equipment costs are high.

Generally, the resin conversion molding process for manufacturing a fiber composite material is to first pre-cut the cut fiber material into the mold, and then inject the resin. After the resin is infiltrated into the fiber material, the mold is heated, and the resin is heated and chemically hardened. In order to obtain the desired fiber composite product.

For example, the Republic of China Patent Notice No. 583068 "Resin Vacuum In the suction press molding method, the patent uses a vacuum suction force inside the mold to attract the resin into the fiber material, and simultaneously compresses the fiber material using the elastic rubber and heats the mold to integrate the resin with the fiber material. However, the introduction of the resin by the molding method is still too long, mainly because the fiber material has been compressed by the elastic rubber film while the resin is introduced, so that the flow pores of the resin in the fiber material are greatly reduced, so that it takes a long filling time. In addition, during the resin injection process, the resin flow pressure causes the elastic film to expand, so that after the fiber material is completely wetted, it is necessary to further evacuate the unnecessary excess resin through continuous vacuuming to achieve a uniform compression thickness of the article. However, it has been experimentally found that most of the excess resin is concentrated at the resin inlet, far from the vacuum outlet, and the pores in the fiber after the compression of the resin have been greatly reduced, so that the time required to remove the excess resin will be equivalent. long. In summary, although this patent introduces high-temperature airflow heating during the resin flow, the resin viscosity is lowered and the flow is accelerated. However, the resin is not completely or completely moved in the mold filling due to the excessive filling and removal of the excess resin. In addition to excess resin, the chance of hardening in advance is greatly increased.

For example, in the patent case of the "Resin Transfer Molding Device" of the Republic of China Patent Publication No. M474625, a plurality of vacuum suction ports of the upper mold body are subjected to vacuum extraction, and the adsorption film is upward, so that the reinforcing material is in a loose stacked state. Then, vacuum extraction is performed on the vacuum suction port of the lower mold, so that the resin can quickly penetrate into the loose reinforcing material. When sufficient resin is injected, high-pressure hot air is introduced into the vacuum suction port of the upper mold to drive the film to expand. On the one hand, the film is used to compress the fiber to the finished thickness, and the resin is infiltrated into the dry fiber which has not been wetted. On the other hand, the hot air is passed through the film preheating resin. To make the resin easier to flow. After the resin is completely wetted, the fibrous material is further compressed by the film, and the excess resin is extruded from the vacuum suction port. However, this patent has the same disadvantages as Patent No. 583068, and the time required to remove excess resin is also too long.

Therefore, in the case of the film-type resin transfer molding method, there is usually a disadvantage that the filling time is too long and the time required for extruding the excess resin is too long, even if the filling time can be shortened as described in the above-mentioned Patent No. M474625, There is a disadvantage that the excess resin is extruded for too long. That is to say, when the fiber reinforcing material is molded, the time for the resin to be injected into the fiber and the length of time for extracting the excess resin in the fiber are the key factors affecting the process speed.

Therefore, the object of the present invention is to provide a rapid resin transfer molding apparatus which can effectively increase the resin injection speed and excess resin extraction speed while relatively increasing the processing speed.

Therefore, the novel rapid resin transfer molding device is suitable for assisting a resin transfer into a reinforcing material under vacuum or near vacuum, and comprises a mold unit, a hot gas supply unit capable of being driven to output high temperature gas, a resin injection unit that can be driven to output resin, an air extraction unit that can be driven to perform pumping, and a switching valve unit that is connected to the mold unit, the hot gas supply unit, the resin injection unit, and the pumping unit .

The mode unit comprises a lower mold body, a mold body detachably disposed above the lower mold body, and an elastic film, the lower mold body having an opening facing upward and accommodating the reinforcing material Slot, and separate An elastic injection film is detachably mounted between the upper mold body and the lower mold body and closes the pocket, and is connected to the upper mold body and the one of the suction holes The phantom cooperates to define an expansion space between the two and spaced apart from the pocket, and the elastic film can be elastically squeezed by the high pressure gas poured into the expansion space to elastically expand and squeeze the groove The reinforcing material has a through hole communicating with the expansion space.

The switching valve unit includes a first valve body that communicates with the through hole and the hot gas supply unit and can be opened to introduce high temperature gas into the expansion space to heat the housing, a communication with the through hole and the pumping a second valve body that can be opened between the gas units so that the suction unit can apply a vacuum suction force to the expansion space via the through hole, and a communication between the injection hole and the resin injection unit and can be opened a third valve body injected into the receiving tank through the injection hole, a communication between the suction hole and the suction unit, and being opened, so that the air suction unit can apply the cavity through the suction hole a fourth valve body of negative pressure suction, and a fifth valve body connected to the suction hole and the injection hole and being openable to communicate a negative pressure suction force applied to the suction hole to the injection hole.

The effect of the novel: The novel has the effect of accelerating the filling of the resin, can accelerate the removal of excess undesired resin, does not need to put the mold into the high temperature furnace to harden the resin, and can save the cost of building a large high temperature furnace equipment for a large finished product, indeed It can solve the long-standing lack of conventional resin transfer molding technology.

2‧‧‧Mold unit

21‧‧‧ Lower phantom

210‧‧‧ 容容

211‧‧‧Injection hole

212‧‧‧ suction hole

22‧‧‧Upper body

220‧‧‧Expansion space

221‧‧‧through hole

23‧‧‧elastic film

24‧‧‧Seal

3‧‧‧Pumping unit

31‧‧‧vacuum pump

32‧‧‧buffer

5‧‧‧ resin injection unit

6‧‧‧hot gas supply unit

7‧‧‧Switch valve unit

71‧‧‧First valve body

72‧‧‧Second body

73‧‧‧ third valve body

74‧‧‧fourth valve body

75‧‧‧ fifth valve body

800‧‧‧Resin

801‧‧‧ reinforcing materials

Other features and effects of the present invention will be apparent from the following description of the drawings, in which: BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a structural view showing an embodiment of a novel rapid resin transfer molding apparatus; Fig. 2 is a flow chart showing a step of processing a resin composite fiber reinforcing material in the embodiment; and Fig. 3 is a partial side sectional view showing the embodiment. FIG. 4 is a view similar to FIG. 3, schematically illustrating the case where the embodiment performs the heating compression step; and FIG. 5 is a view similar to FIG. 3, illustrating the case where the vacuum pressure is applied and the resin is injected; FIG. The case where the embodiment removes the excess resin and the heat hardening step is schematically illustrated.

Referring to Figures 1 and 3, an embodiment of the novel rapid resin transfer molding apparatus is suitable for injecting a resin 800 into a reinforcing material 801 under vacuum or near vacuum to form a resin composite. Fiber reinforcement. The reinforcing material 801 is generally made of a light-weight fiber material, and has a plurality of slits therein. When the resin 800 is filled in the gap in the reinforcing material 801, and the resin 800 is hardened by heating, the resin composite fiber reinforcing material is formed. The mechanical strength of the resin composite fiber reinforced material produced by the process will be greatly improved.

The rapid resin transfer molding apparatus comprises: a mold unit 2, an air extraction unit 3, a resin injection unit 5, a hot gas supply unit 6, and an on-off valve unit 7.

The mold unit 2 includes a lower mold body 21, a mold body 22 detachably disposed above the lower mold body 21, and a mold body 22 mounted thereon. An elastic film 23 between the lower mold body 21 and the upper mold body 22, and an annular seal member 24 mounted between the top surface of the lower mold body 21 and the elastic film 23. The lower mold body 21 has a receiving groove 211 and a suction hole 212, wherein the opening is upwardly facing to accommodate the reinforcing material 801, and the upper and the right ends of the receiving groove 210 are respectively vertically penetrated. The upper mold body 22 has a through hole 221 which is vertically disposed at the center of the left and right sides. The seal member 24 is an oil seal and is disposed on the top surface of the lower mold body 21 around the pocket 210. The elastic film 23 is detachably stacked on the sealing member 24, and is sandwiched and positioned between the lower mold body 21 and the upper mold body 22 to hermetically seal the pocket 210, and The mold body 22 cooperates to define an expansion space 220 that is spaced above the pocket 210 and communicates with the through hole 221 .

The pumping unit 3 is connected to the switching valve unit 7, and includes a vacuum pump 31 for extracting gas, and a buffer cylinder 32 installed between the suction hole 212 and the vacuum pump 31. The vacuum pump 31 is connected to the through hole 221, the injection hole 211 and the suction hole 212, and the gas in the cavity 210 and the expansion space 220 can be extracted. The buffer tube 32 is disposed in the suction hole. Between the 212 and the vacuum pump 31, the resin 800 can be prevented from flowing directly from the suction hole 212 to the vacuum pump 31, causing the vacuum pump 31 to be damaged.

The resin injecting unit 5 is filled with a resin 800 intended to be poured, and is connected to the injection hole 211 via which the resin 800 can be transferred into the cavity 210, and is filled in the resin injection hole 211. In the gap of the reinforcing material 801.

The hot gas supply unit 6 is connected to the through hole 221 and can be externally The boundary air is heated to a high temperature hot gas, and high temperature hot gas is injected into the expansion space 220.

The switch valve unit 7 includes a first valve body 71 that is openably and closably connected between the hot gas supply unit 6 and the through hole 221, and is openably and closably connected between the air suction unit 3 and the through hole 221. a second valve body 72, a third valve body 73 that is openably and closably connected between the injection hole 211 and the resin injection unit 5, and an openable connection between the buffer cylinder 32 and the vacuum pump 31 The fourth valve body 74 and a fifth valve body 75 that is openably and closably connected to the injection hole 211 and the buffer cylinder 32.

Referring to Fig. 1, Fig. 2 and Fig. 3, the implementation process of the novel rapid resin conversion molding device for manufacturing the resin composite fiber reinforcing material is completed by the following steps: (a) placing and closing steps, (b) a vacuum negative pressure step, (c) a resin injection step, (d) a heat compression step, and (e) a heat hardening step.

First, in the (a) placing and closing step, the reinforcing material 801 to be filled with the resin 800 is placed separately or overlappingly in the pocket 210 of the lower mold body 21, and the thickness of the reinforcing material 801 is not set. It is larger than the height of the container 210, otherwise the effect of shortening the injection time of the resin 800 is not obvious. Then, the elastic film 23 is sealed on the cavity 210, and the upper mold body 22 is overlapped on the top side of the lower mold body 21 and the elastic film 23, so that the elastic film 23 is clamped and fixed on the upper mold body. 22 is interposed between the lower mold body 21.

Next, (b) vacuuming the negative pressure step, first closing all of the valve bodies 71 to 75, and starting the vacuum pump 31 until the vacuum pump 31 reaches a steady or near negative atmospheric pressure. Then, the connection of the through hole 221 is opened. The second valve body 72 applies the negative pressure to the expansion space 220, that is, the gas in the expansion space 220 is extracted. As shown by an arrow 803 in FIG. 3, the elastic film 23 is generated by the suction generated by the negative pressure. Adhering upwardly to the upper mold body 22. Then, the fourth valve body 74 is opened, and the tank 210 is evacuated through the suction hole 212 to stabilize or close the tank 210 to a negative atmospheric pressure, as indicated by an arrow 804 in FIG. At this time, since the expansion space 220 and the container 210 are in an equal pressure state, the elastic film 23 does not deform downward and presses the reinforcing member 801, so that the fibers in the reinforcing member 801 can be kept loose.

Then, (c) a resin injecting step is performed to open the third valve body 73 connected to the injection hole 211, and the resin 800 of the resin injection unit 5 is attracted by the vacuum suction force of the container 210, as shown by an arrow 805 in FIG. The resin 800 is sucked into the cavity 210 through the injection hole 211, and is filled in the gap of the reinforcing material 801. At this time, since the fibers in the reinforcing material 801 remain loose, the resin 800 can be easily The flow penetrates into the gap. After the completion of the injection of the resin 800, the third valve body 73 is closed to stop the injection of the resin 800. When the (c) resin injection step is performed, the amount of the resin 800 required for the finished product can be estimated in advance, but for the sake of safety, the resin 800 is insufficiently filled in the finished product, and in this embodiment, the amount of the resin 800 to be poured is more than estimated. The amount of resin 800 is, for example, 20% more, but it is not limited thereto.

Referring to Fig. 1, Fig. 2, Fig. 4, next, (d) a heating compression step is performed to first adjust the hot gas supply unit 6 to a predetermined temperature so that the hot gas supply unit 6 heats the internal gas to a desired high temperature gas. Then, the second valve body 72 is closed, the air in the expansion space 220 is stopped, and then the air is turned on. The first valve body 71, because the expansion space 220 is in a negative pressure state, and the container 210 is still in a state of being continuously evacuated, the heated high temperature gas is attracted and infused by the through hole 221 into the expansion. The space 220, as shown by the arrow 806 in FIG. 4, elastically expands and deforms the elastic film 23 downward, and on the other hand, preheats the resin 800 in the cavity 210 by the thermal energy transmitted from the high-temperature gas to the elastic film 23, thereby improving The fluidity of the resin 800, on the other hand, by the elastic pressing force generated by the elastic expansion deformation of the elastic film 23, the reinforcing material 801 of the filled resin 800 is gradually compressed to a predetermined finished thickness, and at the same time drives the The excess resin 800 inside the reinforcing material 801 flows in the direction of the suction hole 212 and is filled in the portion that has not been wetted until the resin 800 completely wets the fibers of the reinforcing material 801, and the excess resin 800 passes through the suction hole 212. It is sucked into the buffer cylinder 32.

Referring to FIG. 1, FIG. 2, and FIG. 5, the fifth valve body 75 is further opened, and the injection hole 211 is subjected to a vacuum suction force, and the unnecessary excess resin 800 accumulated in the vicinity of the injection hole 211 is quickly sucked into the buffer. The cylinder 32, as shown by an arrow 807 in FIG. 5, that is, a vacuum suction force is applied to the injection hole 211 and the suction hole 212 to absorb excess resin 800, and the reinforcing material 801 can be more accelerated. The excess resin 800 in the fiber allows the thickness of the reinforcing material 801 to be rapidly reduced, and the desired uniform thickness of the finished product can be quickly achieved.

Finally, the (e) heat-hardening step is performed, and the resin 800 is heated by the high-temperature gas poured into the expansion space 220, so that the gelation reaction of the resin 800 is accelerated until the resin 800 is gelled and hardened, and the fiber-reinforced material can be released. .

If the conventional process is carried out in the step (c), in the present rapid resin conversion molding apparatus, that is, after the resin 800 is filled in the container 210, and then the heating and compression step is performed, a large amount of the resin 800 is wasted. Moreover, the time for extracting the excess resin 800 that has been poured into the reinforcing material 801 will be longer. Even if the amount of the resin 800 is just changed, the conventional process only has the advantage that the resin 800 is not wasted, and the compression step is still It will be very slow, and it is actually difficult to inject just 800 of the amount of resin.

The communication structure between the switch valve unit 7 and the die unit 2, the pumping unit 3, the resin injection unit 5 and the hot gas supply unit 6 is designed such that the rapid resin transfer molding device of the present invention can close the third valve The body 73 stops the output of the resin 800, and pressurizes the reinforcing material 801 with the elastic film 23, and at the same time, the high-temperature gas heating auxiliary resin 800 rapidly flows to wet the fiber, and then further transforms into the suction hole 212 and the injection. The hole 211 is evacuated to quickly remove the excess resin 800 poured into the reinforcing material 801, and the process can be greatly shortened without wasting the amount of the micro resin 800, and the reinforcing material 801 does not need to be placed in the high temperature furnace. The resin 800 is hardened to reduce the cost of construction.

In summary, the novel rapid resin transfer molding device has the following advantages: (1) having the effect of accelerating the filling resin. (B) can accelerate the removal of excess unwanted resin. (3) It is not necessary to put the mold into the high-temperature furnace to harden the resin, and the cost of building a large-scale high-temperature furnace equipment can be omitted for the large-scale finished product. Therefore, the present invention can solve the long-standing deficiency of the conventional resin transfer molding technology, and thus can truly achieve the purpose of the present invention.

However, the above is only the preferred embodiment of the present invention. The scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made in accordance with the scope of the new patent application and the contents of the patent specification are still within the scope of the present patent.

2‧‧‧Mold unit

21‧‧‧ Lower phantom

210‧‧‧ 容容

211‧‧‧Injection hole

212‧‧‧ suction hole

22‧‧‧Upper body

221‧‧‧through hole

23‧‧‧elastic film

24‧‧‧Seal

3‧‧‧Pumping unit

31‧‧‧vacuum pump

32‧‧‧buffer

5‧‧‧ resin injection unit

6‧‧‧hot gas supply unit

7‧‧‧Switch valve unit

71‧‧‧First valve body

72‧‧‧Second body

73‧‧‧ third valve body

74‧‧‧fourth valve body

75‧‧‧ fifth valve body

800‧‧‧Resin

801‧‧‧ reinforcing materials

Claims (3)

A rapid resin transfer molding device, which is suitable for pouring resin into a reinforcing material under vacuum or near vacuum, and comprising: a mold unit comprising a lower mold body and a detachable cover a mold body above the lower mold body, and an elastic film having a cavity facing upwardly for receiving the reinforcing material, and an injection hole respectively communicating with opposite ends of the cavity And a suction hole, the elastic film is detachably mounted between the upper mold body and the lower mold body and closes the pocket, and cooperates with the upper mold body to define an in between An expansion space spaced apart from the pocket, the elastic film may be elastically extruded by a high pressure gas poured into the expansion space to elastically expand and press the reinforcing material to the pocket, the upper mold body having an expansion space a through hole; a hot gas supply unit that can be driven to output high temperature gas; a resin injection unit that can be driven to output resin; an air extraction unit that can be driven to pump; and a switch valve unit that communicates with The mold unit, the hot gas supply unit, the resin injection unit and the air extraction unit, including a communication between the through hole and the hot gas supply unit, and being opened to introduce high temperature gas into the expansion space to the cavity a heated first valve body, a second valve body communicating with the through hole and the air suction unit and being opened to allow the air suction unit to apply a negative pressure suction force to the expansion space via the through hole a third valve body between the injection hole and the resin injection unit and capable of being opened to inject resin into the cavity through the injection hole, a fourth valve body connected between the suction hole and the air suction unit and capable of being opened to allow the air suction unit to apply a negative pressure suction force to the cavity through the suction hole, and a communication with the suction A hole between the hole and the injection hole may be opened to cause a negative pressure suction force applied to the suction hole to communicate with the fifth valve body applied to the injection hole. The rapid resin transfer molding apparatus according to claim 1, wherein the suction unit includes a vacuum pump for extracting gas and a buffer cylinder, and the buffer cylinder is connected to the suction hole and the vacuum gang. The second valve body is connected between the through hole and the vacuum pump, and the fourth valve body is connected between the buffer tube and the vacuum pump. The rapid resin transfer molding apparatus of claim 1, wherein the mold unit further comprises an annular oil seal disposed around a top surface of the lower mold body, the elastic film being airtightly stacked against the oil seal to close the mold Crate.