WO2016063387A1 - 複合材料の成形方法および成形装置 - Google Patents
複合材料の成形方法および成形装置 Download PDFInfo
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- WO2016063387A1 WO2016063387A1 PCT/JP2014/078140 JP2014078140W WO2016063387A1 WO 2016063387 A1 WO2016063387 A1 WO 2016063387A1 JP 2014078140 W JP2014078140 W JP 2014078140W WO 2016063387 A1 WO2016063387 A1 WO 2016063387A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
- B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C39/10—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/24—Feeding the material into the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/42—Casting under special conditions, e.g. vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/44—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
- B29C67/246—Moulding high reactive monomers or prepolymers, e.g. by reaction injection moulding [RIM], liquid injection moulding [LIM]
Definitions
- the present invention relates to a molding method and molding apparatus for a composite material.
- RTM Resin Transfer Molding
- a reinforcing base material is installed in a cavity in a molding die composed of a pair of lower molds (female molds) and upper molds (male molds) that can be opened and closed. After closing the mold, the resin is injected from the resin inlet, and the reinforced base material is impregnated with the resin. And a composite material is obtained by hardening resin in a cavity.
- the molding time can be shortened by increasing the resin injection pressure.
- the pressure in the cavity suddenly increases and the mold opens. If the mold is opened at the time of molding, burrs are generated in the molded product, causing molding defects. For this reason, it is necessary to load the mold with a high clamping pressure by the press machine, which causes a problem that the size of the press machine increases and the equipment cost increases accordingly.
- an object of the present invention is to provide a molding method and a molding apparatus for a composite material that can suppress the clamping pressure while reducing the molding time.
- a reinforced base material is disposed in a cavity in a mold that can be opened and closed, and a resin is placed in the cavity in a state where a mold clamping pressure is applied to the mold.
- It is a molding method in which a composite material is molded by pouring and curing the resin. Adjusting the injection pressure of the resin between a first pressure higher than the mold clamping pressure and a second pressure lower than the mold clamping pressure when injecting the resin into the cavity; and The injection pressure of the resin is lowered at least once from a pressure higher than the mold clamping pressure to a pressure lower than the mold clamping pressure.
- the resin is injected without the pressure in the cavity exceeding the mold clamping pressure from the start of injection of the resin to the end of injection.
- An apparatus for molding a composite material according to the present invention that achieves the above object includes an openable / closable mold having a cavity in which a reinforcing substrate is disposed, a press section for applying a clamping pressure to the mold, and the cavity.
- a resin injection part for injecting resin into the resin a pressure adjustment part provided in the resin injection part and capable of adjusting the injection pressure of the resin, and a control for controlling the operation of the pressure adjustment part based on the pressure in the cavity Part.
- the control unit controls the operation of the pressure adjusting unit to adjust the injection pressure of the resin between a first pressure higher than the mold clamping pressure and a second pressure lower than the mold clamping pressure.
- the injection pressure of the resin is lowered at least once from a pressure higher than the mold clamping pressure to a pressure lower than the mold clamping pressure.
- the resin is injected without the pressure in the cavity exceeding the mold clamping pressure from the start of injection of the resin to the end of injection.
- FIG. 4A is a graph showing the time transition of the pressure in the cavity according to this embodiment
- FIG. 4B is a graph showing the time transition of the injection pressure of the resin according to this embodiment. is there.
- FIG. 5A is a diagram showing an automobile part using a composite material
- FIG. 5B is a diagram showing a vehicle body in which the parts are joined.
- FIG. 1 is a schematic view of a molding apparatus 100 for a composite material 200.
- FIG. 2 is a schematic diagram illustrating the configuration of the resin injection unit 30.
- FIG. 3 is a flowchart showing a method for forming the composite material 200.
- FIG. 4A is a graph showing the time transition of the pressure Pr in the cavity 15 according to the present embodiment, and FIG. 4B shows the time transition of the injection pressure Pi of the resin according to the present embodiment.
- FIG. FIG. 5 is a schematic view of automobile parts 301 to 303 and a vehicle body 300 using the composite material 200.
- the composite material 200 obtained by the molding method and the molding apparatus 100 according to the present embodiment is composed of a reinforced base material 210 and a resin 220.
- the composite material 200 having higher strength and rigidity than the resin 220 alone is obtained.
- a frame part such as a front side member 301 and a pillar 302, which are parts used in a car body 300 (see FIG. 5B) of an automobile, and an outer plate part such as a roof 303.
- the reinforced substrate 210 is formed of a woven sheet of carbon fiber, glass fiber, organic fiber or the like, and is placed in the cavity 15 formed in the mold 10 in a laminated state and preformed.
- a carbon fiber having a small thermal expansion coefficient, excellent dimensional stability, and little deterioration in mechanical properties even at high temperatures is used.
- the preform may be performed by another mold other than the mold 10.
- an epoxy resin, a phenol resin, or the like, which is a thermosetting resin is used as the resin 220.
- an epoxy resin having excellent mechanical characteristics and dimensional stability is used.
- Epoxy resin is mainly a two-component type, and a main agent and a curing agent are mixed and used.
- the main agent is generally a bisphenol A-type epoxy resin, and the curing agent is an amine-based one.
- the main agent is not particularly limited, and can be appropriately selected according to desired material characteristics.
- the molding apparatus 100 can be outlined as follows: a mold 10 that can be opened and closed in which a cavity 15 in which a carbon fiber 210 (corresponding to a reinforced base material) is disposed, and a mold 10.
- a press part 20 for applying a clamping pressure Pm to the resin
- a resin injection part 30 for injecting a resin 220 into the cavity 15
- a valve 40 pressure adjustment
- the molding apparatus 100 includes a pressure gauge 50 that measures the pressure Pr in the cavity 15, a suction unit 60 that evacuates the mold 10, a mold temperature adjustment unit 70 that adjusts the temperature of the mold 10, and a molding apparatus.
- a control unit 80 for controlling the operation of the entire system 100.
- the controller 80 controls the operation of the valve 40 based on the pressure Pr in the cavity 15 measured by the pressure gauge 50.
- the molding apparatus 100 will be described in detail.
- the mold 10 has a pair of upper mold 11 (male mold) and a lower mold 12 (female mold) that can be opened and closed.
- a sealable cavity 15 is formed between the upper mold 11 and the lower mold 12.
- the carbon fiber 210 is placed in the cavity 15 in advance in a state of being laminated and preformed.
- An injection port 13 is provided above the upper mold 11.
- the injection port 13 is connected to the resin injection part 30 and the resin 220 is injected into the cavity 15 from above.
- the resin 220 is impregnated into the inside from the upper surface of the carbon fiber 210.
- a suction port 14 is provided at the end of the lower mold 12.
- the suction port 14 is connected to the suction part 60, and the inside of the cavity 15 is evacuated to suck and remove air.
- a sealing member or the like may be provided on the mating surface of the upper mold 11 and the lower mold 12.
- the pressing unit 20 applies a clamping pressure Pm to the upper mold 11 of the mold 10.
- the press unit 20 includes a cylinder 21 that uses fluid pressure such as hydraulic pressure, and adjusts the mold clamping pressure Pm by controlling the hydraulic pressure or the like.
- the resin injecting unit 30 includes a main agent tank 31 filled with a main agent, a curing agent tank 32 filled with a curing agent, a tube 36 forming a conveyance path for the main agent, the curing agent, and the resin 220 in which they are mixed, A pressure gauge 34 for measuring the injection pressure Pi of the resin 220 into the cavity 15 and a valve 40 capable of adjusting the injection pressure Pi of the resin 220 are provided.
- the pressure gauge 34 is arranged in a tube 36 near the injection port 13 in order to measure the injection pressure Pi of the resin 220.
- the resin injecting unit 30 further includes pumps 35a and 35b disposed in tubes 33a and 33b connected to the main agent tank 31 and the curing agent tank 32, respectively.
- the pumps 35a and 35b discharge the main agent and the curing agent toward the valve 40 at a constant pressure.
- the valve 40 is connected to the inlet 13 of the mold 10 via the tube 36.
- the valve 40 includes a cylinder 41 and a piston 42.
- the cylinder 41 has two chambers 41 u and 41 d defined by a base end portion 42 a of the piston 42.
- the fluid pressure such as pneumatic pressure or hydraulic pressure supplied to the two chambers 41u and 41d
- the piston 42 moves in the vertical direction in the figure.
- the opening degree of the flow path of the main agent and the curing agent is adjusted.
- the injection amount Qi of the resin 220 into the cavity 15 is adjusted by the opening degree of the valve 40, and the injection pressure Pi of the resin 220 conveyed to the mold 10 is adjusted.
- the cylinder 41 has upper suction ports 44a and 44b and lower discharge ports 45a and 45b.
- the lower discharge ports 45a and 45b are opened.
- the main agent and the curing agent discharged from each of the lower discharge ports 45 a and 45 b are mixed to become the resin 220.
- the resin 220 is discharged to the injection port 13 through the tube 36.
- the upper suction ports 44a and 44b and the lower discharge ports 45a and 45b communicate with each other through the recesses 43a and 43b formed in the piston 42.
- the main agent and the curing agent pass through the recesses 43a and 43b from the lower discharge ports 45a and 45b, and are returned again to the main agent tank 31 and the curing agent tank 32 from the upper suction ports 44a and 44b.
- the main agent and the curing agent circulate in the tubes 33a and 33b at a constant pressure.
- the pressure gauge 50 includes a strain gauge and the like, and is disposed in the mold 10 for measuring the pressure Pr in the cavity 15.
- the suction unit 60 has a vacuum pump (not shown).
- the suction part 60 sucks (evacuates) the air in the cavity 15 from the suction port 14 before injecting the resin 220 to make the inside of the cavity 15 in a vacuum state.
- the mold temperature adjusting unit 70 includes a heating member 71, and heats the mold 10 to the curing temperature of the resin 220 to cure the resin 220 injected into the cavity 15.
- the heating member is an electric heater and heats the mold 10 directly.
- the heating member is not limited to this.
- the temperature of the mold 10 may be adjusted by heating a heat medium such as oil with an electric heater and circulating the heat medium in the mold 10.
- the control unit 80 controls the overall operation of the molding apparatus 100.
- the control unit 80 includes a storage unit 81, a calculation unit 82, and an input / output unit 83.
- the input / output unit 83 is connected to the pressure gauges 34 and 50, the valve 40, the suction unit 60, and the mold temperature adjusting unit 70.
- the storage unit 81 includes a ROM and a RAM, and stores data such as a threshold value Pc of a pressure Pr in the cavity 15 described later in advance.
- the calculation unit 82 is configured mainly with a CPU, and receives data on the injection pressure Pi of the resin 220 and the pressure Pr in the cavity 15 from the pressure gauges 34 and 50 via the input / output unit 83.
- the calculation unit 82 heats the mold 10 by the piston 42 position of the valve 40, the suction pressure of the suction unit 60, and the mold temperature adjustment unit 70 based on the data read from the storage unit 81 and the data received from the input / output unit 83. Calculate the temperature. A control signal based on the calculated data is transmitted to the valve 40, the suction unit 60 and the mold temperature adjusting unit 70 via the input / output unit 83. In this way, the control unit 80 controls the injection pressure Pi of the resin 220, the pressure Pr in the cavity 15 during evacuation, the mold temperature, and the like.
- the molding method of the composite material 200 includes a step of arranging the carbon fibers 210 (step S1), a step of performing vacuum suction (step S2), and a step of injecting the resin 220 (steps S3 to S8). ), A step of curing the resin 220 (step S9), and a step of demolding (step S10).
- step S1 the step of arranging the carbon fibers 210
- step S2 a step of performing vacuum suction
- step S3 to S8 a step of injecting the resin 220
- step S9 a step of demolding
- carbon fibers 210 are laminated, placed in the cavity 15 of the mold 10 and preformed (step S1). At this time, the inner surface of the mold facing the cavity 15 is degreased using a predetermined organic solvent, and is subjected to a mold release process using a mold release agent.
- step S2 the mold 10 is closed, air is sucked from the suction port 14 by the suction part 60, and vacuuming is performed to make the cavity 15 in a vacuum state (step S2).
- the control unit 80 adjusts the pressure so that the pressure becomes negative.
- the suction port 14 is completely closed and kept closed until the end of molding.
- the injection pressure Pi of the resin 220 is adjusted to be a first pressure P1 (see FIG. 4B) higher than the mold clamping pressure Pm, and injection of the resin 220 is started from the injection port 13 (step S3). .
- the injected resin 220 is impregnated from the upper surface of the carbon fiber 210.
- the injection pressure Pi and the mold clamping pressure Pm become substantially the same pressure.
- step S4 After starting the injection of the resin 220, the pressure Pr in the cavity 15 is measured by the pressure gauge 34 within a predetermined time (step S4). The injection of the resin 220 and the measurement of the pressure Pr in the cavity 15 are continued until the pressure Pr in the cavity 15 reaches the threshold value Pc (step S5: “No”, steps S3 and S4). When the pressure Pr in the cavity 15 reaches the threshold value Pc (step S5: “Yes”), the injection pressure Pi of the resin 220 is decreased (step S6).
- the threshold value Pc is set to a value slightly lower than the mold clamping pressure Pm in advance based on the material characteristics of the resin 220, the injection amount, the injection speed, and the like. In the present embodiment, the threshold value Pc is set to 90% of the mold clamping pressure Pm. In consideration of pressure measurement errors, for example, a value in the range of 85% to 95% of the mold clamping pressure Pm can be selected as the threshold value.
- the threshold value Pc By setting the threshold value Pc to a high value, the injection pressure Pi of the resin 220 can be increased to the vicinity of the mold clamping pressure Pm, and the injection time can be shortened. Furthermore, the impregnation property of the resin 220 into the carbon fiber 210 can be improved by increasing the pressure Pr in the cavity 15.
- the injection pressure Pi of the resin 220 is lowered at least once from a high pressure to a pressure lower than the mold clamping pressure Pm.
- the resin 220 is injected so that the pressure in the cavity 15 does not exceed the mold clamping pressure Pm from the start of injection of the resin 220 to the end of injection (step S7).
- the threshold value Pc it is preferable to set the threshold value Pc as high as possible from the viewpoint of shortening the injection time. However, it is preferable to set the threshold value Pc so that an overshoot in which the pressure Pr in the cavity 15 exceeds the mold clamping pressure Pm does not occur in the injection pressure control of the resin 220.
- step S7 is repeated until the resin 220 is completely filled in the cavity 15 (step S8: “No”, step S7).
- step S8 When the specified amount of the resin 220 is injected into the cavity 15 (step S8: “Yes”), the resin 220 in the cavity 15 is left until it is sufficiently cured (step S9).
- the entire mold 10 is temperature-adjusted in advance to the curing temperature of the resin 220 by the mold temperature adjusting unit 70.
- step S10 When the mold 10 is opened and the molded composite material 200 is demolded, the molding is completed (step S10).
- the graphs indicated by the solid lines show time transitions of the pressure Pr in the cavity 15 and the injection pressure Pi of the resin 220 by the molding method according to this embodiment shown in FIG.
- the graph shown by the broken line is proportional, and shows the time transition of the pressure Pr in the cavity 15 and the injection pressure Pi of the resin 220 when the injection pressure Pi of the resin 220 is injected at a constant high pressure until the completion of injection.
- Time 0 [sec] to t1 is a mold clamping process
- time t1 to t2 is a vacuuming process
- time t2 to t3 is a resin 220 injection process
- after t3, a resin 220 curing process is shown in FIGS. 4A and 4B, after the resin 220 is injected at the injection pressure Pi, the pressure Pr in the cavity 15 does not increase immediately, but gradually increases after the injection pressure Pi. .
- the injection pressure Pi of the resin 220 is gradually lowered so as to be stepped as shown in FIG.
- the valve 40 is controlled by the control unit 80 so that the pressure Pr in the cavity 15 does not exceed the mold clamping pressure Pm from the start of injection of the resin 220 shown in FIG.
- the injection pressure Pi of the resin 220 is adjusted between the first pressure P1 higher than the clamping pressure Pm and the second pressure P2 lower than the mold clamping pressure Pm.
- the injection pressure Pi of the resin 220 is lowered at least once from a pressure higher than the mold clamping pressure Pm to a pressure lower than the mold clamping pressure Pm.
- the second pressure P2 can be set to an arbitrary value between the gauge pressure 0 [MPa] and the mold clamping pressure Pm.
- the pressure Pr in the cavity 15 is significantly higher than the mold clamping pressure Pm in proportion to the injection pressure Pi of the resin 220 that is uniformly high-pressure injected until the completion of injection. It becomes high up to P3.
- the pressure Pr in the cavity 15 does not exceed the mold clamping pressure Pm from the start of injection of the resin 220 to the end of injection. 220 is injected. Since the injection is performed so that the pressure Pr in the cavity 15 does not exceed the mold clamping pressure Pm, the mold clamping pressure Pm generated by the press unit 20 can be suppressed. By being able to suppress the mold clamping pressure Pm, it is possible to reduce the size of the press machine and contribute to a reduction in equipment costs.
- the pressure Pr in the cavity 15 does not drop abruptly as shown in a proportional relationship (dashed line in FIG. 4A) at the start of curing.
- the shrinkage rate of the resin 220 during curing increases. Therefore, according to the molding method of the present embodiment, the molding shrinkage rate of the composite material 200, which is a molded product, is reduced as compared with the case where the high-pressure injection of the resin 220 is made constant as in a comparative manner, and the shape as designed is obtained. It can be obtained stably. As a result, a molded article of a good quality composite material 200 with high dimensional stability can be obtained.
- the control of the injection pressure Pi of the resin 220 can be appropriately changed according to the material characteristics of the resin 220.
- the length is appropriately changed according to the curing time from the injection of the resin 220 into the cavity 15 to the curing.
- the injection time of the resin 220 needs to be shortened. Therefore, the injection pressure Pi of the resin 220 is set to the first pressure P1 from the start of injection.
- the injection of the resin 220 is started at a high pressure, and the pressure Pr in the cavity 15 is controlled to be as close as possible to the mold clamping pressure Pm.
- the injection pressure Pi of the resin 220 at the start of injection may be set to a value lower than the mold clamping pressure Pm. it can.
- the injection pressure Pi of the resin 220 is set higher than the mold clamping pressure Pm during the injection.
- the injection pressure Pi of the resin 220 is higher than the mold clamping pressure Pm and the mold.
- the injection pressure Pi of the resin 220 is lowered at least once from a pressure higher than the mold clamping pressure Pm to a pressure lower than the mold clamping pressure Pm. . Accordingly, the resin 220 is injected without the pressure Pr in the cavity 15 exceeding the mold clamping pressure Pm from the start of injection of the resin 220 to the end of injection.
- the molding apparatus 100 configured as described above and the molding method using the molding apparatus 100, by having a time zone for injecting the resin 220 with a pressure higher than the mold clamping pressure Pm between the start of injection and the end of injection.
- the average injection pressure from the start of injection to the end of injection is higher than when injection is performed at a pressure lower than the mold clamping pressure Pm from the start of injection to the end of injection.
- the mold clamping pressure Pm can be suppressed by adjusting the injection pressure Pi of the resin 220 so that the pressure Pr in the cavity 15 does not exceed the mold clamping pressure Pm.
- the injection pressure Pi of the resin 220 is gradually lowered from a pressure higher than the mold clamping pressure Pm to a pressure lower than the mold clamping pressure Pm.
- the average injection pressure from the start of injection to the end of injection is higher than when injection is performed at a low pressure from the start of injection to the end of injection.
- the injection time of the resin 220 can be shortened and the molding time can be shortened.
- the injection pressure Pi of the resin 220 is decreased from the first pressure. .
- control is facilitated by providing a reference value for controlling the injection pressure Pi of the resin 220.
- the injection pressure Pi at the start of the injection of the resin 220 is set as the first pressure.
- the pressure in the cavity 15 is obtained by high-pressure injection at the start of injection of the resin 220 in which the pressure Pr in the cavity 15 is still low.
- the differential pressure between the injection pressure Pi of Pr and the resin 220 increases, and the resin 220 easily flows into the cavity 15. As a result, the injection speed of the resin 220 can be increased and the molding time can be further shortened.
- the mold 10 is evacuated before the resin 220 is injected.
- the inside of the cavity 15 is evacuated before the resin 220 is injected, and is generated in the resin 220 and on the surface after the resin 220 is injected. Air bubbles can be prevented and voids and pits of the composite material 200 that is a molded product can be reduced. Thereby, the mechanical characteristics and designability of the composite material 200 can be improved.
- the reinforced substrate 210 is formed from carbon fiber.
- the use of carbon fiber for the reinforced base material results in a small coefficient of thermal expansion, excellent dimensional stability, and mechanical properties even at high temperatures.
- the composite material 200 with little deterioration in characteristics can be formed.
- the composite material 200 is used for an automobile part.
- the automobile part of the composite material 200 suitable for mass production can be molded, and the weight of the vehicle body can be reduced.
- the resin 220 is a thermosetting resin, but a thermoplastic resin may be used.
- the mold temperature adjusting unit 70 further includes a cooling member 72, the mold 10 is heated by the heating member 71 while the resin 220 is injected into the cavity 15, and the mold is injected after the resin 220 is injected. 10 is cooled. Thereby, the viscosity of the resin 220 at the time of injecting the resin 220 is decreased to facilitate the impregnation of the carbon fibers 210, and the resin 220 can be cured by cooling after the injection.
- the pressure Pr in the cavity 15 is measured by the pressure gauge 50, but the measurement method is not limited to this, and the injection pressure Pi of the resin 220, the size of the injection port 13, It may be estimated from the volume.
- the injection of the resin 220 is started with the injection pressure Pi of the resin 220 being higher than the mold clamping pressure Pm (first pressure P1), but the injection of the resin 220 is started from the start of injection to the end of injection. There may be a point in time when the pressure Pi becomes the first pressure P1.
- the injection pressure Pi of the resin 220 is gradually lowered stepwise (step S6 in FIG. 3, FIG. 4B). See).
- the pattern for lowering the injection pressure Pi is not limited to the illustrated step shape, and an appropriate pattern can be set.
- the injection pressure Pi can be lowered at a time (at a stroke) from a pressure higher than the mold clamping pressure Pm to a pressure lower than the mold clamping pressure Pm, or gradually lowered so as to draw a curve.
- the injection port 13 for the resin 220 is provided in the upper die 11 and the suction part 60 for evacuation is provided in the lower die 12, but it may be provided in either the upper die 11 or the lower die 12. Good.
- the number of the inlets 13 and the suction ports 14 is one, but the number is not limited to this, and a plurality of inlets 13 and suction ports 14 may be provided.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
11 上型、
12 下型、
13 注入口、
14 吸引口、
15 キャビティ、
20 プレス部、
30 樹脂注入部、
31 主剤タンク、
32 硬化剤タンク、
33、36 チューブ、
34、50 圧力計、
35 ポンプ、
40 バルブ(圧力調整部)、
41 シリンダー、
42 ピストン、
60 吸引部、
70 成形型温度調整部、
80 制御部、
100 成形装置、
200 複合材料、
210 炭素繊維(強化基材)、
220 樹脂、
300 車体、
Pm 型締圧力、
Pr キャビティ内の圧力、
Pi 注入圧力、
Pc しきい値、
P1 第1の圧力、
P2 第2の圧力、
Qi 注入量。
Claims (14)
- 開閉可能な成形型内のキャビティに強化基材を配置し、前記成形型に型締圧力を負荷した状態において樹脂を前記キャビティ内に注入し、前記樹脂を硬化させて複合材料を成形する成形方法であって、
前記樹脂を前記キャビティ内に注入するとき、前記樹脂の注入圧力を前記型締圧力よりも高い第1の圧力と前記型締圧力よりも低い第2の圧力との間において調整し、かつ、前記型締圧力よりも高い圧力から前記型締圧力よりも低い圧力へ前記樹脂の前記注入圧力を少なくとも1回は降下させることによって、前記樹脂の注入開始から注入終了まで前記キャビティ内の圧力が前記型締圧力を超えることなく前記樹脂を注入する、複合材料の成形方法。 - 前記樹脂の前記注入圧力を、前記型締圧力よりも高い圧力から前記型締圧力よりも低い圧力まで、一度にまたは徐々に降下させる、請求項1に記載の複合材料の成形方法。
- 前記キャビティ内の圧力が上昇し予め設定したしきい値に達すると、前記樹脂の前記注入圧力を、前記第1の圧力から降下させる、請求項1または請求項2に記載の複合材料の成形方法。
- 前記樹脂の注入開始時の前記注入圧力を前記第1の圧力とする、請求項1~3のいずれか1項に記載の複合材料の成形方法。
- 前記樹脂を注入する前に、前記成形型内を真空引きする、請求項1~4のいずれか1項に記載の複合材料の成形方法。
- 前記強化基材は炭素繊維から形成されてなる、請求項1~5のいずれか1項に記載の複合材料の成形方法。
- 前記複合材料は自動車部品に使用される、請求項1~6のいずれか1項に記載の複合材料の成形方法。
- 強化基材を配置するキャビティが形成された開閉可能な成形型と、
前記成形型に型締圧力を負荷するプレス部と、
前記キャビティ内に樹脂を注入する樹脂注入部と、
前記樹脂注入部に備えられ前記樹脂の注入圧力を調整自在な圧力調整部と、
前記キャビティ内の圧力に基づいて前記圧力調整部の作動を制御する制御部と、を有し、
前記制御部は、前記圧力調整部の作動を制御し、前記樹脂の前記注入圧力を前記型締圧力よりも高い第1の圧力と前記型締圧力よりも低い第2の圧力との間において調整し、かつ、前記型締圧力よりも高い圧力から前記型締圧力よりも低い圧力へ前記樹脂の前記注入圧力を少なくとも1回は降下させることによって、前記樹脂の注入開始から注入終了まで前記キャビティ内の圧力が前記型締圧力を超えることなく前記樹脂を注入させる、複合材料の成形装置。 - 前記制御部は、前記樹脂の前記注入圧力を、前記型締圧力よりも高い圧力から前記型締圧力よりも低い圧力まで、一度にまたは徐々に降下させる、請求項8に記載の複合材料の成形装置。
- 前記制御部は、前記キャビティ内の圧力が上昇し予め設定したしきい値に達すると、前記樹脂の前記注入圧力を、前記第1の圧力から降下させる、請求項8または請求項9に記載の複合材料の成形装置。
- 前記樹脂の注入開始時の前記注入圧力を前記第1の圧力とする、請求項8~10のいずれか1項に記載の複合材料の成形装置。
- 前記成形型内を真空引きする吸引部をさらに有し、
前記制御部は、前記樹脂を注入する前に、前記吸引部の作動を制御して前記成形型内を真空引きする、請求項8~11のいずれか1項に記載の複合材料の成形装置。 - 前記強化基材は炭素繊維から形成されてなる、請求項8~12のいずれか1項に記載の複合材料の成形装置。
- 前記複合材料は自動車部品用の材料である、請求項8~13のいずれか1項に記載の複合材料の成形装置。
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