A molding device

Abstract

The application relates to the technical field of thermoplastic materials, and discloses a forming device which comprises a base and a cover body; a first concave cavity is formed in the surface of the base, and a first airflow channel and a second airflow channel are arranged on the base; a boss matched with the first concave cavity is arranged on the cover body; a second concave cavity is formed in the bottom wall of the first concave cavity; a first through hole communicated with the first airflow channel is formed in the side wall of the first concave cavity; and a second through hole communicated with the second airflow channel is formed in the side wall of the first concave cavity. When the LFT material is used to make products, the shearing action of a screw is not needed, so that the glass fiber length of the formed products is longer, and the mechanical properties are better. The products prepared by using the application have good fluidity, and are suitable for the production of high-strength complex parts with certain surface appearance requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermoplastic materials, in particular to a molding device. BACKGROUND

[0002] Generally, the longer the glass fiber length, the better the mechanical properties of the product made of glass fiber.

[0003] At present, LFT (long fiber reinforced thermoplastic material) materials are divided into two forms of LFT-G (long fiber reinforced thermoplastic pellet) and LFT-D (long glass fiber reinforced thermoplastic composite). When the products are made, LFT-G and LFT-D materials are generally molded and made into products by using screw injection or extrusion. Due to the strong shearing action of the screw, the length of the glass fiber obtained is only 1-2 mm, and the mechanical properties are poor. SUMMARY

[0004] The purpose of the present application is to provide a molding device for processing LFT materials and making LFT materials into products that can maintain the length of glass fiber and have moderate molding fluidity.

[0005] In order to achieve the above-mentioned purpose, the present application provides a molding device, comprising a base and a cover; the surface of the base is recessed to form a first recessed cavity, and the base is provided with a first airflow channel and a second airflow channel; the cover is provided with a boss matched with the first recessed cavity; the bottom wall of the first recessed cavity is recessed to form a second recessed cavity; the sidewall of the first recessed cavity is provided with a first through hole communicating with the first airflow channel, and the sidewall of the first recessed cavity is provided with a second through hole communicating with the second airflow channel.

[0006] Further, the first through hole and the second through hole are each provided with a plurality of holes.

[0007] Further, the depth of the second recessed cavity is 0.8-1.2 mm.

[0008] Further, it further comprises a hot air machine and a first pipe connected to one end of the first airflow channel and the other end of the hot air machine.

[0009] Further, it further comprises a second pipe connected to one end of the second airflow channel and the other end of the hot air machine.

[0010] Further, it further comprises a thermostat, a third pipe and a fourth pipe; the base is provided with a first cavity, and the cover is provided with a second cavity; one end of the third pipe is connected to the first cavity, and the other end of the third pipe is connected to the thermostat; one end of the fourth pipe is connected to the second cavity, and the other end of the fourth pipe is connected to the thermostat.

[0011] Further, the first communication pipe and the second communication pipe are further included; therefore, the third cavity is further arranged in the base, the fourth cavity is further arranged in the cover, the first cavity and the third cavity are communicated through the first communication pipe, and the second cavity and the fourth cavity are communicated through the second communication pipe.

[0012] Further, the first return pipe and the second return pipe are further included; one end of the first return pipe is communicated to the third cavity, the other end of the first return pipe is connected to the thermostat, one end of the second return pipe is communicated to the fourth cavity, and the other end of the second return pipe is connected to the thermostat.

[0013] Further, the first cavity, the second cavity, the third cavity and the fourth cavity are all channels extending in a straight line direction.

[0014] Further, the first cavity and the third cavity both penetrate through the base and are parallel to each other, one end of the first cavity is connected to one end of the third cavity through the first communication pipe; the second cavity and the fourth cavity both penetrate through the cover and are parallel to each other, one end of the second cavity is connected to one end of the fourth cavity through the second communication pipe.

[0015] Compared with the prior art, the forming device of the embodiment of the present application has the following beneficial effects:

[0016] When the LFT material is processed and the LFT material is made into a product, the LFT material with a particle length of 12-15 mm is first filled into the first cavity; then the cover is arranged in the first cavity and the boss is kept at a distance from the bottom wall of the first cavity; hot air is input into the first airflow channel, the hot air enters the first cavity through the first through hole, the LFT material in the first cavity is heated and melted, the hot air flows into the second airflow channel through the second through hole and is discharged through the second airflow channel; after the LFT material is heated and melted for a period of time, the cover is continuously driven to move, so that the side surface of the boss is attached to the cavity wall of the first cavity, and the surface of the boss abuts against the bottom wall of the first cavity; at this time, the melted LFT material is extruded into the second cavity and is fixed in shape in the second cavity until the LFT material solidifies to form a solid, and a shaped product is obtained. When the LFT material is used to make a product, the present application does not need to pass through the shearing action of a screw, so that the glass fiber length of the shaped product is longer and the mechanical properties are better. The product made by the present application has good fluidity and is suitable for the production of high-strength complex parts with certain surface appearance requirements. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of the forming device of the embodiment of the present application.

[0018] Figure 2 is a structure diagram of the cover of the molding device of the embodiment of the present application when the cover is in the first position.

[0019] Figure 3 is a structure diagram of the molding device of the embodiment of the present application when the cover is in the first position. Figure 2 is a sectional view in the direction of A-A.

[0020] Figure 4 is a structure diagram of the molding device of the embodiment of the present application when the cover is in the first position. Figure 3 is an enlarged view at B.

[0021] Figure 5 is a structure diagram of the molding device of the embodiment of the present application when the cover is in the first position. Figure 3 is an enlarged view at C.

[0022] Figure 6 is a structure diagram of the cover of the molding device of the embodiment of the present application when the cover is in the second position.

[0023] Figure 7 is a structure diagram of the molding device of the embodiment of the present application when the cover is in the first position. Figure 6 is an enlarged view at D.

[0024] In the figure, 1 is a base, 2 is a cover, 21 is a boss, 3 is a first cavity, 4 is a first pipe, 5 is a second pipe, 6 is a hot air blower, 7 is a second cavity, 8 is a first airflow channel, 9 is a first through hole, 10 is a second airflow channel, 11 is a second through hole, 12 is a thermostat, 13 is a third pipe, 14 is a fourth pipe, 15 is a first communication pipe, 16 is a second communication pipe, 17 is a first return pipe, and 18 is a second return pipe. DETAILED DESCRIPTION

[0025] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0027] In addition, the terms "first", "second", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an ordered sequence. Thus, features referring to "first", "second" etc. can include one or more of the features, explicitly or implicitly.

[0028] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connection", "fixed", and the like are used broadly and exemplarily, for example, can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection via an intermediate medium; can be internal communication of two elements, or interaction between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In the present application, unless specifically defined otherwise, "on" or "under" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. "Under", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0030] As shown in Figure 1 , 2 , 6 and Figure 7 , a forming device of a preferred embodiment of the present application comprises a base 1 and a cover 2; the surface of the base 1 is recessed to form a first recessed cavity 3, and the base 1 is provided with a first airflow channel 8 and a second airflow channel 10; the cover 2 is provided with a boss 21 matched with the first recessed cavity 3; the bottom wall of the first recessed cavity 3 is recessed to form a second recessed cavity 7; the sidewall of the first recessed cavity 3 is provided with a first through hole 9 communicated with the first airflow channel 8, and the sidewall of the first recessed cavity 3 is provided with a second through hole 11 communicated with the second airflow channel 10.

[0031] In the present embodiment, the product is made by the following forming method:

[0032] Step 1, prepare the cover 2 and the base 1 with the first recessed cavity 3.

[0033] Step 2, fill the LFT material with a length of 12-15mm in the first recessed cavity 3 of the base 1.

[0034] Step 3, the cover 2 is moved along the cavity wall of the first cavity 3 to the first position; when the cover 2 is in the first position, a gap is formed between the boss 21 and the bottom wall of the first cavity 3, and the first through hole 9 and the second through hole 11 are formed on the side wall of the first cavity 3 between the boss 21 and the bottom wall of the first cavity 3.

[0035] Step 4, hot air is introduced into the first cavity 3 through the first airflow channel 8 and the first through hole 9, and the hot air is discharged from the first cavity 3 to the outside of the first cavity 3 through the second through hole 11 and the second airflow channel 10; at this time, the inside of the first cavity 3 is kept in a temperature range capable of melting the LFT material, and the LFT material is melted in the first cavity 3.

[0036] Step 5, after a predetermined time, the cover 2 is driven to the second position; at this time, the first through hole 9 and the second through hole 11 are sealed, and the melted LFT material is filled in the second cavity 7 under the action of the base 1 and the cover 2, and is cooled and solidified to form a solid, a shaped product.

[0037] The embodiment is applied to the production of products made of LFT material, and does not need to pass through the shearing action of a screw, so that the glass fiber length of the shaped product is longer and the mechanical properties are better. The product produced by the application has good fluidity and is suitable for the production of high-strength complex parts with certain surface appearance requirements.

[0038] In the embodiment, the shape of the product made of LFT material by the molding device is controlled by the second cavity 7. Alternatively, the molding device of the embodiment is used to directly produce the product that needs to be produced finally; alternatively, the molding device of the embodiment is used to produce, for example, a semi-finished product, so as to save transportation cost.

[0039] Preferably, when a semi-finished product is produced, a preferred embodiment in which the structure of the semi-finished product is a sheet structure is described: at this time, the shape of the second cavity 7 is a rectangular chamber, and the super LFT molded material molded from a plurality of LFT materials has good fluidity, which is convenient for subsequent production of products by molding. Compared with other existing glass fiber materials, the sheet also has good advantages, and the comparison is as follows:

[0040] Compared with the existing GMT (glass fiber mat reinforced thermoplastic plastic) material, the mechanical properties of the product produced by the molding device of the embodiment are good. Although the glass fiber length of the existing GMT material can reach about 50 mm, the glass fiber length of the product made by molding can also be basically maintained, but since the manufacturing method of the GMT material is obtained by a glass fiber mat film coating method or a method of scattering glass fiber and then covering a film, both processes cannot fully pre-impregnate the glass fiber, so the mechanical properties of the product are poor.

[0041] Compared with the existing continuous glass fiber reinforced sheet, the product prepared by the molding device of the embodiment has moderate fluidity. The existing continuous glass fiber reinforced sheet has good pre-impregnation effect, and the mechanical properties of the product are also good, but because the glass fiber is continuous, the fluidity during molding is limited, so it can only be used to make some structural parts with low appearance requirements.

[0042] In addition, in the prior art, the glass fiber material needs to be first melted on a heating device and then molded on a molding device to obtain a product. This method needs to transfer the melted raw material to the molding device, and the overall structure and steps are complex, which limits the molding efficiency.

[0043] Compared with the prior art, the cover 2 of the embodiment has a boss 21 matched with the first recessed cavity 3, which can slide on the cavity wall of the first recessed cavity 3 and switch between a first position of opening the first airflow channel 8 and the second airflow channel 10 respectively and a second position of closing the first airflow channel 8 and the second airflow channel 10 respectively. When the cover 2 is in the first position, hot air can enter the first recessed cavity 3 to melt the LFT material. When the cover 2 is in the second position, the input of hot air is cut off and a product is molded. The embodiment is convenient and fast, and does not need to transfer the melted material, so the molding efficiency is high.

[0044] Specifically, in one embodiment, please refer to Figure 3 -5, the first through hole 9 and the second through hole 11 are each provided with a plurality of. After the hot air is buffered in the first airflow channel 8, it enters the first recessed cavity 3 through the plurality of first through holes 9 respectively, and the plurality of second through holes 11 collect the hot air. After the hot air is buffered in the second airflow channel 10, it is discharged. The hot air of the embodiment can uniformly heat each position of the first recessed cavity 3, avoiding the influence of local overheating or local overcooling on the properties of the LFT material. Preferably, the base 1 is horizontally arranged, the first recessed cavity 3 is arranged on the upper surface of the base 1, and the first straight line and the second straight line are horizontally arranged along the side wall of the main cavity.

[0045] Preferably, in one embodiment, the product made by the molding device of the embodiment is a sheet, and the finished product is obtained by processing the sheet; that is, the second recessed cavity 7 is a rectangular cavity.

[0046] Specifically, in one embodiment, please refer to Figure 6 -7, when the second recessed cavity 7 is a rectangular cavity, the depth of the second recessed cavity 7 is 0.8-1.2 mm. In the embodiment, a rectangular sheet is made by using the second recessed cavity 7; preferably, the depth of the second recessed cavity 7 is 1 mm, which is convenient for making a standardized sheet. At this time, the tensile strength of the sheet reaches 250 MPa.

[0047] Preferably, the first cavity 3 is a rectangular chamber, the first plurality of through holes 9 are arranged on one side wall of the first cavity 3 and are spaced apart along a first direction, and the second plurality of through holes 11 are arranged on another side wall of the first cavity 3 and are spaced apart along a second direction, the first direction and the second direction are the same and are parallel to the side walls of the first cavity 3. In this way, the boss 21 can seal the first plurality of through holes 9 and the second plurality of through holes 11 simultaneously when sliding along the side walls of the first cavity 3.

[0048] Specifically, in one embodiment, referring to Figure 1 -2, further comprising a hot air machine 6 and a first pipe 4, one end of which is connected to the first airflow channel 8 and the other end of which is connected to the hot air machine 6. In this embodiment, the hot air machine 6 delivers hot air from the first pipe 4 to the first airflow channel 8.

[0049] Specifically, in one embodiment, referring to Figure 1 Further comprising a second pipe 5, one end of which is connected to the second airflow channel 10 and the other end of which is connected to the hot air machine 6. In this embodiment, the second pipe 5 serves as a return air pipe of the hot air machine 6, which recycles the hot air, reduces the energy consumption of the hot air machine 6, and improves the efficiency of the molding device.

[0050] Preferably, in one embodiment, referring to Figure 1 -2, the temperature of the hot air output by the hot air machine 6 is 240-260°. Preferably, the temperature of the hot air is 250°, which is used to maintain the temperature inside the first cavity 3 at 250°, and the time of the hot air circulation is 2 minutes.

[0051] Specifically, in one embodiment, further comprising a thermostat 12, a third pipe 13, and a fourth pipe 14; the base 1 is provided with a first cavity, and the cover 2 is provided with a second cavity; one end of the third pipe 13 is connected to the first cavity, and the other end of the third pipe 13 is connected to the thermostat 12; one end of the fourth pipe 14 is connected to the second cavity, and the other end of the fourth pipe 14 is connected to the thermostat 12. In this embodiment, the thermostat 12 is provided with a region for filling a heat transfer medium, the heat transfer medium is delivered into the first cavity through the third pipe 13, and the heat transfer medium is delivered into the second cavity through the fourth pipe 14. In this embodiment, when the heat transfer medium is delivered into the first cavity or the second cavity through the thermostat 12, it comes into contact with the cavity walls of the first cavity or the second cavity, thereby realizing heat exchange between the heat transfer medium and the base 1 and between the heat transfer medium and the cover 2, and controlling the temperature inside the first cavity 3.

[0052] Preferably, the thermostat 12 is a cold-hot integrated mold temperature controller, which outputs heat or cold by refrigeration cycle. In this embodiment, the thermostat 12 outputs cold to cool the base 1 and the cover 2 after being heated by hot air, and to cool the first concave cavity 3 through the base 1 and the cover 2, so that the temperature inside the first concave cavity 3 is kept low for a certain time. Preferably, the thermostat 12 keeps the temperature inside the first concave cavity 3 at 80 degrees for 1 minute, and the heat transfer medium is refrigerant.

[0053] Specifically, in one embodiment, referring to Figure 1 -2, further comprising a first communication pipe 15 and a second communication pipe 16; so that the base 1 is further provided with a third cavity, and the cover 2 is further provided with a fourth cavity, the first cavity and the third cavity are communicated through the first communication pipe 15, and the second cavity and the fourth cavity are communicated through the second communication pipe 16. During heat transfer, the heat transfer medium entering the base 1 first enters the first cavity and diffuses in the first cavity, and then enters the third cavity through the first communication pipe 15 and diffuses in the third cavity. Similarly, the heat transfer medium entering the cover 2 first enters the second cavity and diffuses in the second cavity, and then enters the fourth cavity through the second communication pipe 16 and diffuses in the fourth cavity. In this embodiment, the contact area between the heat transfer medium and the base 1 is increased, and the contact area between the heat transfer medium and the cover 2 is also increased, which is good for cooling the base 1 and the cover 2 and helps to keep the temperature in the first concave cavity 3 and avoid local temperature imbalance.

[0054] Specifically, in one embodiment, referring to Figure 1 , further comprising a first return pipe 17 and a second return pipe 18; one end of the first return pipe 17 is communicated to the third cavity, and the other end of the first return pipe 17 is connected to the thermostat 12; one end of the second return pipe 18 is communicated to the fourth cavity, and the other end of the second return pipe 18 is connected to the thermostat 12. In this embodiment, the heat transfer medium completes return to the thermostat 12 through the first return pipe 17 and the second return pipe 18, realizing the recycling of the heat transfer medium.

[0055] Specifically, in one embodiment, referring to Figure 1 , the first cavity, the second cavity, the third cavity and the fourth cavity are all channels extending in a straight line direction.

[0056] Specifically, in one embodiment, the first cavity and the third cavity both penetrate through the base 1 and are parallel to each other, and one end of the first cavity is connected to one end of the third cavity through the first communication pipe 15; the second cavity and the fourth cavity both penetrate through the cover 2 and are parallel to each other, and one end of the second cavity is connected to one end of the fourth cavity through the second communication pipe 16. At this time, the first communication pipe 15 is arranged outside the base 1, and the second communication pipe 16 is arranged outside the cover 2.

[0057] The working process of the forming device of the preferred embodiment is as follows:

[0058] First, the LFT material is filled in the first cavity 3. Then, the cover 2 is moved along the cavity wall of the first cavity 3 to the first position, wherein the first position is configured such that when the cover 2 is in the first position, a gap is formed between the boss 21 and the bottom wall of the first cavity 3, and the first through hole 9 and the second through hole 11 are formed on the side wall of the first cavity 3 between the boss 21 and the bottom wall of the first cavity 3. Further, the hot air machine 6 is used to input hot air into the first cavity 3 through the first airflow channel 8 and the first through hole 9, and the hot air is discharged from the first cavity 3 to the outside of the first cavity 3 through the second through hole 11 and the second airflow channel 10. The hot air provided by the hot air machine 6 keeps the inside of the first cavity 3 at a temperature range that can melt the LFT material, such as 240-260°, and keeps it at this temperature for a period of time, such as 2 minutes, at which the LFT material is melted. Then, the hot air machine 6 is turned off, and the cover 2 is driven to move to the second position, wherein the second position is configured such that when the cover 2 is in the second position, the first through hole 9 and the second through hole 11 are sealed by the boss 21, and the boss 21 abuts against the bottom wall of the first cavity 3. At this time, the melted LFT material is filled in the second cavity 7 under the action of the base 1 and the cover 2. Then, the thermostat 12 is used to input cooling fluid into the first cavity through the third pipe 13 to reduce the temperature of the base 1, and input cooling fluid into the second cavity through the fourth pipe 14 to reduce the temperature of the cover 2, thereby reducing the temperature of the inside of the second cavity 7 by reducing the temperature of the base 1 and the cover 2. The cooling fluid flowing into the first cavity enters the third cavity through the first communication pipe 15, and then flows back to the thermostat 12 through the first return pipe 17. The cooling fluid flowing into the second cavity enters the fourth cavity through the second communication pipe 16, and then flows back to the thermostat 12 through the second return pipe 18. After a certain period of cooling, a rectangular sheet is formed.

[0059] The embodiment is applied to the production of products made of LFT material, and does not need to pass through the shearing action of a screw, so that the glass fiber length of the formed product is longer, and the mechanical properties are better. The product made by the application has good fluidity, and is suitable for the production of high-strength complex parts with certain surface appearance requirements.

[0060] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0061] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since the scope of the application will be defined with respect to the claims and their equivalents.

Claims

1. A molding apparatus, characterized in that, Includes the base and the cover; The base has a first cavity formed by a recess on its surface, and a first airflow channel and a second airflow channel are provided on the base; the first airflow channel and the second airflow channel are used to transport hot air; The cover is provided with a boss that matches the first cavity; The bottom wall of the first cavity is recessed to form a second cavity; a first through hole communicating with the first airflow channel is provided on the side wall of the first cavity, and a second through hole communicating with the second airflow channel is provided on the side wall of the first cavity; multiple first through holes and multiple second through holes are provided.

2. The molding apparatus according to claim 1, characterized in that, The depth of the second cavity is 0.8~1.2mm.

3. The molding apparatus according to claim 1, characterized in that, It also includes a hot air blower and a first pipe with one end connected to the first airflow channel and the other end connected to the hot air blower.

4. The molding apparatus according to claim 3, characterized in that, It also includes a second pipe with one end connected to the second airflow channel and the other end connected to the hot air blower.

5. The molding apparatus according to claim 1, characterized in that, It also includes a temperature control unit, a third tube, and a fourth tube; the base has a first cavity, and the cover has a second cavity; One end of the third tube is connected to the first cavity, and the other end of the third tube is connected to the temperature control machine; One end of the fourth tube is connected to the second cavity, and the other end of the fourth tube is connected to the temperature control machine.

6. The molding apparatus according to claim 5, characterized in that, It also includes a first connecting pipe and a second connecting pipe; therefore, the base is also provided with a third cavity, and the cover is also provided with a fourth cavity. The first cavity and the third cavity are connected through the first connecting pipe, and the second cavity and the fourth cavity are connected through the second connecting pipe.

7. The molding apparatus according to claim 6, characterized in that, It also includes a first reflux pipe and a second reflux pipe; one end of the first reflux pipe is connected to the third cavity, and the other end of the first reflux pipe is connected to the temperature control unit. One end of the second reflux pipe is connected to the fourth cavity, and the other end of the second reflux pipe is connected to the temperature control unit.

8. The molding apparatus according to claim 7, characterized in that, The first cavity, the second cavity, the third cavity, and the fourth cavity are all channels extending in a straight line.

9. The molding apparatus according to claim 8, characterized in that, The first cavity and the third cavity both penetrate the base and are parallel to each other. One end of the first cavity is connected to one end of the third cavity through the first connecting pipe. The second cavity and the fourth cavity both penetrate the cover and are parallel to each other. One end of the second cavity is connected to one end of the fourth cavity through the second connecting pipe.

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