JP2020029060A - Compression molding system and compression molding method of reinforced fiber-contained resin - Google Patents

Abstract

To provide a compression molding system and a compression molding method capable of performing appropriate material supply from a compressed material supply device to a lower die, etc.SOLUTION: A compression molding system 11 of reinforced fiber-contained resin, in which molten resin material M containing reinforced fiber is fed from a material feeding device 15 to an opened lower die 13 of a compression molding device 14 and then the lower die 13 and an upper die 12 are closed to compress the molten resin material M, comprises: the material feeding device 15 comprising a heating cylinder 28 having a screw or a plunger built-in and a feed port 27; material detection means 24 for detecting the molten resin material M fed from the material feeding device 15 toward the lower die 13, etc.; and moving means 34 for relatively moving the lower die 13, etc. and the material feeding device 15 with the detection of the molten resin material M by the material detection means 24.SELECTED DRAWING: Figure 1

Description

The present invention supplies the molten resin material containing the reinforcing fiber from the material supply device to the opened lower mold of the compression molding apparatus, and then compresses the molten resin material by closing the lower mold and the upper mold. The present invention relates to a compression molding system and a compression molding method for a reinforcing fiber-containing resin.

The molten resin material containing the reinforcing fiber has lower fluidity than the same molten resin material that does not contain the reinforcing fiber. Therefore, when molding by injection molding, it is difficult to feed a molten resin material containing a reinforcing fiber with poor fluidity into the cavity through a sprue or runner with a small cross-sectional area, especially for thin molded products. There were cases where molding was not possible. Therefore, in the field of molding of a molten resin material containing reinforcing fibers, a molten resin material containing reinforcing fibers is supplied from a material supply device to a cavity surface of an opened lower mold of a compression molding device, and then the lower portion is formed. Patent Documents 1 and 2 disclose a compression molding system for a reinforcing fiber-containing resin in which a mold and an upper mold are closed to compress the molten resin material.

Patent Literature 1 relates to a compression molding system for forming an article from a thermoplastic resin and a fiber, and extrudes a molten mixed material from an extruder and supplies the molten mixed material while moving the lower mold when it is naturally dropped on a cavity surface of the lower mold. It is. Then, the lower mold to which the molten mixed material has been supplied is conveyed to a pressing device and presses the upper mold to form an article.

Patent Document 2 also supplies a molten resin material of carbon fiber and resin from a material supply device to a cavity surface of a lower die, moves the lower die to a pressing position of a press device, fixes the lower die, lowers the upper die, and The present invention relates to a compression molding system for compressing a molten resin material. In Patent Document 2, when the molten resin material is supplied from the material supply device, the movement of the lower mold and the movement of the material supply device are performed simultaneously or alternately. In the devices of Patent Document 1 and Patent Document 2, the molten resin material is supplied while moving the lower mold or the like. Therefore, theoretically, the molten resin material is not uniformly supplied to only a specific portion of the cavity surface of the lower mold, but is evenly distributed. Can supply.

Japanese Unexamined Patent Publication No. 2006-509648 (Claim 1, FIG. 6A) JP 2013-215771 A (Claims 4, 5, 5, 1 and 4)

However, the molten resin material containing the reinforcing fibers supplied from the material supply device has a low fluidity as described above, and deformation such as twisting may occur during the supply from the supply device. Actually, there is a variance in the time when the material falls to the cavity surface of the lower mold after starting the material supply operation. Therefore, if the lower die or the material supply device is moved using the timing of the material supply operation by the supply device (including the case of delaying the material supply) as a trigger, appropriate material supply to the cavity surface of the lower die often cannot be performed. .

In the present invention, in view of the above problems, the molten resin material containing reinforcing fibers is supplied from the material supply device to the opened lower mold of the compression molding apparatus, and then the lower mold and the upper mold are closed. It is an object of the present invention to provide a compression molding system and a compression molding method capable of appropriately supplying a material from a material supply device in a compression molding system of a reinforcing fiber-containing resin that compresses the molten resin material.

The compression molding system for reinforcing fiber-containing resin according to claim 1 of the present invention supplies a molten resin material containing reinforcing fibers from a material supply device to a lower mold opened by a compression molding device, and thereafter, A compression molding system of a reinforcing fiber-containing resin for compressing the molten resin material by closing a lower mold and an upper mold, the material supply device including a heating cylinder having a screw or a plunger therein and a supply port, and the material supply device A material detecting means for detecting a molten resin material supplied from the apparatus to the lower mold or the material temporary placing portion; and a lower mold or a material temporary placing portion and material supply by detecting the molten resin material by the material detecting means. Moving means for relatively moving the device.

According to a second aspect of the present invention, in the compression molding system for a reinforcing fiber-containing resin according to the first aspect, the material detection unit is provided in a compression molding apparatus, and the material detection means is provided at an upper position near an end of a lower mold cavity. The molten resin material supplied from the supply device to the lower mold is detected.

In the compression molding method of a reinforcing fiber-containing resin according to claim 3 of the present invention, a molten resin material containing a reinforcing fiber is supplied from a material supply device to a lower mold that is opened by a compression molding device, and then the lower resin is supplied. A method for compression molding a reinforcing fiber-containing resin in which a mold and an upper mold are closed to compress the molten resin material, wherein when a material detection unit detects the molten resin material supplied from the material supply device, a lower mold or a material temporary. The mounting part and the material supply device are relatively started to move.

According to a fourth aspect of the present invention, in the compression molding method for a reinforcing fiber-containing resin according to the third aspect, the molten resin material supplied from the material supply device is a material containing carbon fibers and a thermoplastic resin. Features.

The reinforcing fiber-containing resin compression molding system of the present invention supplies a molten resin material containing reinforcing fibers from a material supply device to a lower mold that is opened in a compression molding apparatus, and then forms a lower mold and an upper mold. A compression molding system of a reinforcing fiber-containing resin that is closed to compress the molten resin material, comprising a heating cylinder having a screw or a plunger built therein and a supply port, and a lower mold or a material from the material supply device. Material detection means for detecting the molten resin material supplied toward the temporary mounting portion, and the lower mold or the material temporary mounting portion and the material supply device are relatively moved by the detection of the molten resin material by the material detection means. Since a moving means for moving is provided, it is possible to supply an appropriate material from the material supply device.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view of the compression molding system of the reinforcing fiber containing resin of this embodiment. It is an arrow view of an AA line of an important section of a compression molding device of a reinforced fiber containing resin of this embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the principal part of the compression molding system of the reinforcing fiber containing resin of this embodiment, and its operation. It is a front view of the compression molding system of the reinforcing fiber containing resin of another embodiment. It is a front view of the compression molding system of the reinforcing fiber containing resin of yet another embodiment.

A compression molding system 11 for a reinforcing fiber-containing resin according to this embodiment will be described with reference to FIGS. The compression molding system 11 of the present embodiment compresses a molten resin material M (hereinafter, referred to as a molten resin material M) in which a resin containing carbon fiber, which is a kind of reinforcing fiber, is melted between an upper mold 12 and a lower mold 13. A compression molding device 14 and a material supply device 15 for the molten resin material M are provided.

The compression molding apparatus 14 will be described. Four tie bars 17 are erected near four corners of a fixed plate 16 as a lower plate, and the upper portion of the tie bar 17 is fixed near four corners of a pressure receiving plate 18 as an upper plate. Have been. A movable plate 19 is inserted between the fixed plate 16 and the pressure receiving plate 18 through the tie bar 17 so as to be movable in the vertical direction. The pressure receiving plate 18 is provided with a compression cylinder 20 as compression means, and the ram 21 of the compression cylinder 20 is fixed to the back surface of the movable plate 19. A mold opening / closing cylinder 22 as a mold opening / closing means is provided between the pressure receiving plate 18 and the movable plate 19. The compression cylinder 20 and the mold opening / closing cylinder 22 may use an electric mechanism, and may be, for example, a compression molding apparatus that performs compression molding using a toggle mechanism or a crank mechanism. The upper die 12 which is a movable die can be attached to a fixed position on the lower surface of the movable plate 19 of the compression molding device 14. Further, a lower mold 13 which is a fixed mold can be attached to a fixed position on the upper surface of the fixed board 16.

Next, the material detecting means 24 attached to the fixed platen 16 will be described. The material detecting means 24 detects the molten resin material M supplied from the material supply device 15 toward the cavity surface 13a of the lower mold 13 at an upper position near the end of the cavity surface 13a of the lower mold 13. In the vicinity of both sides of the upper surface of the fixed platen 16 to which the lower die 13 is attached, support tables 25 of the material detecting means 24 are attached respectively. On one support 25, a light emitter 26a of the photoelectric tube 26 is mounted, and on the other support 25, a light receiver 26b of the photoelectric tube 26 is mounted. The mounting position of these photoelectric tubes 26 can be adjusted in the height direction and in the horizontal direction in response to changes in the lower die 13, the supply port 27 of the material supply device 15, the supplied material, and the like. .

The sensor of the material detecting means 24 is not limited to the photoelectric tube 26 as long as it can detect the molten resin material M. As an example, a CCD camera, an ultrasonic sensor, a capacitance type magnetic sensor, an infrared sensor, or the like may be used. Further, a temperature sensor that detects that the heated molten resin material M has approached, a load cell that detects that the molten resin material M has started to fall onto the lower mold 13, or the like may be used. Further, the material detecting means 24 may be directly attached to the lower mold 13 which is a part of the compression molding device 14, or may be attached to a member outside the compression molding device 14.

Next, the material supply device 15 will be described. The material supply device 15 is provided on one side of the compression molding device 14, and a nozzle 29 having a downward supply port 27 is attached to the tip of a heating cylinder 28 containing a screw (not shown). The nozzle 29 is also called a die, and can be replaced with a different nozzle 29 according to the lower mold 13 and the supplied material. In addition, a cutter (not shown) that shuts off the supply of the molten resin material M may be provided at the supply port 27 of the nozzle 29.

Although not shown, the main body 30 of the material supply device 15 includes a screw rotation motor for rotating the screw, a screw advancing motor for advancing the screw, and the like. A hopper 31 for supplying a material is attached to the main body 30 of the material supply device 15. The mechanism of the material supply device 15 is not limited, and the molten resin material M plasticized by the heating cylinder 28 containing a screw is sent to a piston-type plunger, and the molten resin material M is supplied from the plunger to the lower mold 13. It may be a heating tube that has only the plunger and does not include a plunger.

The material supply device 15 is mounted on a guide rail 33 of a base 32 and is moved forward and backward with respect to the compression molding device 14 by a moving means. Specifically, a cylinder portion 34a of a hydraulic cylinder 34 is attached to a lower portion of the main body 30 of the material supply device 15, and a rod portion 34b is fixed to a side surface of the fixed plate 16 of the compression molding device 14. The moving means may be one using an electric motor and a ball screw mechanism, and the mechanism is not limited.

Next, a compression molding method using the compression molding system 11 of the reinforcing fiber-containing resin of the present embodiment will be described. In a state before FIG. 1, when a previous molded product is compression-molded between the upper die 12 and the lower die 13 of the compression molding device 14, a screw (not shown) is simultaneously connected to the material supply device 15. The screw is rotated by the operation of the rotation motor, and the molten resin material M to be supplied next is plasticized. At this time, the screw is retracted while the back pressure is controlled by the screw forward motor. When the screw reaches a predetermined retracted position, the rotation is stopped, and the plasticization is completed. At this time, the position of the material supply device 15 with respect to the base 32 is one side (rear side) of the guide rail 33 and is stopped at a position most retracted from the compression molding device 14. When molding is completed in the compression molding apparatus 14 before or after the completion of plasticization, the mold opening / closing cylinder 22 and the like are operated, and the movable plate 19 and the upper mold 12 are raised with respect to the fixed plate 16 and the lower mold 13 to open the mold. Will be Then, the molded product stuck to one of the molds 12 and 13 is taken out by a take-out device (not shown).

Next, the hydraulic cylinder 34 of the moving means of the material supply device 15 is operated, and the material supply device 15 is advanced toward the compression molding device 14. When the supply port 27 of the nozzle 29 of the material supply device 15 reaches an upper position near the other end of the cavity surface 13a of the lower mold 13, the advance of the material supply device 15 is stopped. Next, a screw advancing motor (not shown) of the material supply device 15 is operated to advance the screw, and as shown in FIG. 3, the molten resin material is supplied from the supply port 27 of the nozzle 29 toward the cavity 33 a of the lower mold 13. M is supplied so as to fall. The supply of the molten resin material M may be performed by rotating a screw. At this time, the supplied molten resin material M is not a material that easily flows because the thermoplastic resin such as polyamide or polypropylene contains a fiber material such as carbon fiber, and is not a material that flows easily. There is a subtle difference in the time until and how to fall. Therefore, in the present invention, the molten resin material M supplied from the material supply device 15 toward the lower mold 13 is detected by the above-described material detection means 24. In the present embodiment, the passage of material is detected by the photoelectric tubes 26, 26 that scan slightly above the upper surface 13b of the lower mold 13. Note that the supply of the molten resin material M from the material supply device 15 to the cavity surface 13a of the lower mold 13 is performed not by dropping but by using an inclined sliding plate or the like while supplying the molten resin material M on the sliding plate while sliding by the gravity. You may do it.

In the present embodiment, the detection of the molten resin material M by the material detection means 24 slightly above the position of the upper surface 13b of the lower die 13 of the compression molding device 14 as shown in FIG. This is because it is difficult for the photoelectric tube 26 to detect the passage of the molten resin material M inside the concave cavity surface 13a. Therefore, when it is desired to detect the moment when the molten resin material M reaches the cavity surface 13a of the lower mold 13 or immediately before that, the CCD camera and the image analysis system may be used.

Then, with the detection of the molten resin material M by the material detecting means 24, the retreating movement of the material supply device 15 is started, and the molten resin material M falling from the supply port 27 of the nozzle 29 is on the other side of the cavity surface 13a (in FIG. Supply is made evenly from the left side) position to the one side position (the right side in FIG. 1). Alternatively, the moving speed of the material supply device 15 is changed according to the thickness and shape of the molded product so that the optimum amount is supplied to the optimum position. As a result, a large amount of the molten resin material M is not supplied to an unintended location on the cavity surface 13a. At this time, it is general to supply the material while retracting the material supply device 15 and the nozzle 29 thereof as in the present embodiment, but from one side of the cavity surface 13a of the lower mold 13 to the other side (in FIG. The molten resin material M may be supplied while the material supply device 15 is advanced from right to left).

When a predetermined amount of the molten resin material M is supplied, the nozzle 29 of the material supply device 15 retreats to the outside of the compression molding device 14 at a higher speed, and then the movable platen 19 is operated by the operation of the mold opening / closing cylinder 22 of the mold opening / closing means. Is lowered, and the compression molding of the molten resin material M is performed by the compression cylinder 20 of the compression means. The compression molding is performed by position control or pressure control, but detailed description is omitted here.

In the present invention, if the detection of the molten resin material M by the material detection means 24 is a trigger, the material supply device 15 and the lower mold 13 are relatively moved after a slight delay from the detection of the molten resin material M. The movement may be started. Also, it does not exclude a device that moves the material supply device 15 forward or backward and moves the lower die 13 by vibration or the like at a very low speed before the material detection unit 24 detects the molten resin material M.

Next, the compression molding system 41 of the second embodiment shown in FIG. 4 will be described focusing on differences. The structure of the compression molding apparatus 42 of the second embodiment in which the lower die 13 moves horizontally by the moving means 45 is different from the embodiment of FIG. However, the other configuration is the same as that of the embodiment of FIG. A base 43 is provided on the fixed platen 13 below the compression molding device 42 so as to extend toward the material supply device 15. A guide rail 46 or a roller serving as a moving unit 45 is provided over the upper surface of the base 43 of the compression molding device 42 and the upper surface of the fixed platen 16. In the compression molding device 42, the lower die 13 mounted on the bolster 47 can reciprocate on the guide rail 46 and the like. A moving means 45 for the lower mold 13 such as a hydraulic cylinder 48 is attached to the lower part of the bolster 47. It is possible to reciprocate between the supply positions 49.

As shown in FIG. 4, the material detecting means 50 is provided at a material supply position 49 on the base 43 of the compression molding device 42. In the material detecting means, support bases 51 are respectively fixed near both sides of a position where the drawn-out lower die 13 is stopped, and a sensor such as a photoelectric tube 52 is mounted on the upper part thereof. The second embodiment is the same as the embodiment of FIG. 1 in that the type of the sensor is not limited, and that the sensor may be attached to the outside of the lower mold 13 or the compression molding device 42. In the second embodiment, the moving means of the material supply device 15 is not essential.

As a modified example of these, the lower die 13 may be moved to the outside of the compression molding device 42 by moving means using a rotary table. In addition, the material supply device 15 may be moved at the material supply position 49 to supply the molten resin material M, including the example of the rotary table. In this case, the molten resin material M may be supplied while moving both the lower mold 13 and the material supply device 15. Therefore, in the present invention, it is sufficient that the lower die 13 or the material supply device 15 is relatively moved.

Next, the compression molding system 61 of the third embodiment shown in FIG. 5 will be described focusing on differences. In the compression molding system 61 of the third embodiment, the point that the molten resin material M is not directly supplied from the material supply device 15 to the cavity surface 13a of the lower mold 13 but is supplied toward the material temporary placing portion 63 is illustrated. This is different from the first embodiment. However, the other configuration is the same as that of the embodiment of FIG. 1, and thus the description thereof will be omitted using the same reference numerals. In the compression molding system 61 of the third embodiment, a moving means 64 such as a roller for moving a material temporary placing portion 63 is provided on a base 62 provided between the material supply device 15 and the compression molding device 14. ing. The material temporary placing portion 63 is compression-molded by a driving means (not shown) from a placement position 65 where the molten resin material M is placed on the material temporary placing portion 63 on the moving means 64 and the material temporary placing portion 63. It can reciprocate between unloading positions 66 for unloading the molten resin material M toward the device 14.

At this time, the detecting means 67 of the molten resin material M of the present invention is arranged near the mounting position 65 in the moving means 64. When the molten resin material M supplied from the material supply device 15 toward the material temporary placing portion 63 is detected, at least one of the material temporary placing portion 63 and the material supply device 15 is moved, so that both are relatively moved. And the molten resin material M is uniformly supplied onto the material temporary placing portion 63. Then, the molten resin material M placed on the material temporary placing portion 63 is not necessarily indispensable, but is preheated by the preheating device 68, and then supplied to the compression molding device 14 by a transport fork 69 or the like.

The present invention will not be enumerated one by one, but the present invention is not limited to the above-described embodiment, and those in which a person skilled in the art has modified based on the gist of the present invention, and a combination of each part of the above-described embodiment. It goes without saying that the above also applies. The resin used in the present invention is mainly assumed to be a thermoplastic resin, but may be a thermoplastic resin containing a thermosetting resin or a thermosetting resin. As for the fibers, in addition to reinforcing fibers such as carbon fibers and glass fibers, other reinforcing fibers or a combination of plural kinds of fibers is assumed. The fiber content and length are not limited as long as they do not hinder the molding, and the fiber content can be increased or the fiber length can be secured as compared with injection molding.

DESCRIPTION OF SYMBOLS 11 Compression molding system 12 Upper mold 13 Lower mold 14 Compression molding device 15 Material supply device 16 Fixed board 19 Movable board 20 Compression cylinder 24 Material detection means 26 Photoelectric tube (sensor)
27 supply port 28 heating cylinder 29 nozzle 34 hydraulic cylinder (moving means)
63 Material Temporary Placement Section M Molten resin material (molten resin material) in which resin containing carbon fiber is melted

Claims (4)

A molten resin material containing reinforcing fibers is supplied from a material supply device to the opened lower mold of the compression molding apparatus, and then the lower mold and the upper mold are closed to compress the molten resin material. A resin compression molding system,
A material supply device with a heating cylinder and a supply port with a built-in screw or plunger,
Material detection means for detecting the molten resin material supplied from the material supply device toward the lower mold or the material temporary placing portion,
Compression molding of the reinforcing fiber-containing resin, comprising: a lower die or a material temporary placing portion and a moving device for relatively moving the material supply device by detecting the molten resin material by the material detecting device. system. The material detecting means is provided in the compression molding device, and detects the molten resin material supplied to the lower mold from the material supply device at an upper position near the end of the cavity of the lower mold. A compression molding system for the reinforcing fiber-containing resin according to claim 1. A reinforcing fiber-containing resin that supplies a molten resin material containing reinforcing fibers from a material supply device to the opened lower mold of the compression molding apparatus, and then closes the lower mold and the upper mold to compress the molten resin material. Compression molding method,
When the material detection means detects the molten resin material supplied from the material supply device,
A compression molding method for a reinforcing fiber-containing resin, wherein the lower mold or the material temporary placing portion and the material supply device are relatively moved. The method according to claim 3, wherein the molten resin material supplied from the material supply device is a material containing carbon fiber and a thermoplastic resin.