A mold preparation method and its usage method

Abstract

The present invention discloses a preparation mold and a method for using the same. The preparation mold includes an outer mold, and the outer mold is provided with an injection channel. Both ends of the injection channel respectively form an injection inlet and an injection outlet. The injection inlet is located on the outer wall surface of the outer mold, and the injection outlet is located on the inner wall surface of the outer mold. A blocking surface is formed on the inner wall of the injection channel, and the blocking surface can block the injection plastic entering from the injection inlet. The above-mentioned preparation mold can reduce the impact on the injection product and improve the quality of the injection product.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, and particularly relates to a preparation mold and a using method thereof. Background Art

[0002] With the continuous acceleration of the lightweight process of rail vehicles, the application of composite material beams in the form of carbon fiber and the like in rail vehicles is gradually increasing. Different from traditional metal material beams, composite material beams are generally formed by using molds and through injection molding and other methods.

[0003] In related technologies, the mold is configured with an injection port and an overflow port. When preparing a composite material beam, injection plastic (such as resin, etc.) can be injected into the inner cavity of the mold through the injection port. When the injection plastic fills the inner cavity of the mold, it can overflow from the overflow port, and then the injection plastic can be cured by heating and other methods, and thus the required composite material beam can be obtained. However, when the injection plastic enters the inner cavity of the mold from the injection port, it usually has a relatively high pressure, so that the injection plastic will generate a relatively large impact force, which may affect the surface quality of the injection molded product.

[0004] Therefore, how to provide a solution to overcome or alleviate the above defects is still a technical problem that those skilled in the art need to solve urgently. Summary of the Invention

[0005] The purpose of the present invention is to provide a preparation mold and a using method thereof. Among them, the preparation mold can reduce the impact on the injection molded product and can improve the quality of the injection molded product.

[0006] To solve the above technical problems, the present invention provides a preparation mold, including an outer mold. The outer mold is configured with an injection channel. The two ends of the injection channel respectively form an injection inlet and an injection outlet. The injection inlet is located on the outer wall surface of the outer mold, and the injection outlet is located on the inner wall surface of the outer mold. A blocking surface is formed on the inner wall of the injection channel, and the blocking surface can block the injection plastic entering from the injection inlet.

[0007] In the above solution, a blocking surface is formed on the inner wall of the injection channel. This blocking surface can block and buffer the injection plastic entering from the injection inlet, so as to reduce the impact of the injection plastic with a relatively high pressure entering from the injection inlet on the injection molded product, which is beneficial to improving the surface quality of the injection molded product.

[0008] Optionally, the injection channel includes an inlet section and an outlet section that are connected and communicated. The inlet section has the injection inlet, the outlet section has the injection outlet, the inner wall of the outlet section forms the blocking surface, and at least a part of the projection of the inlet section along its axial direction falls on the blocking surface.

[0009] Optionally, the outlet section includes a first subsection and a second subsection that are in communication with each other. There is a stepped surface between the first subsection and the second subsection, and the stepped surface serves as the blocking surface.

[0010] Optionally, the outer mold includes a first mold body and a second mold body that are butt-jointed. The inlet section is entirely disposed in the first mold body, and the outlet section is formed by enclosing the first mold body and the second mold body.

[0011] Optionally, the first mold body has a first docking surface, and the second mold body has a second docking surface. The first docking surface and the second docking surface can be docked; the first docking surface is provided with a first groove body and a second groove body that are in communication with each other. The first groove body is in communication with the inlet section. The depth of the first groove body is greater than that of the second groove body. The stepped surface is formed between the first groove body and the second groove body. The first groove body, the second groove body, and the second docking surface enclose the outlet section.

[0012] Optionally, the lengths of the first groove body and the second groove body are greater than the radial dimension of the inlet section.

[0013] Optionally, a sealing member is provided between the first mold body and the second mold body.

[0014] Optionally, the first mold body is provided with a first end docking member, and the second mold body is provided with a second end docking member. The first mold body and the second mold body are docked through the first end docking member and the second end docking member; the preparation mold further includes a core mold. At least one of the first end docking member and the second end docking member is provided with a positioning portion for positioning the core mold.

[0015] Optionally, the outer mold is further configured with at least one overflow port. Among the injection channel and the overflow port, at least the overflow port is provided with a switching valve.

[0016] Optionally, the number of the overflow ports is multiple, and the overflow ports are arranged at intervals in the circumferential direction on a set cross-section.

[0017] The present invention also provides a method for using a preparation mold, where the preparation mold is the above-mentioned preparation mold, and the outer mold is provided with an overflow port. The method for using includes the following steps: Step S1, configure the preparation mold; Step S2, evacuate the inner cavity of the preparation mold through the overflow port and maintain a set vacuum degree; Step S3, fill the inner cavity with injection plastic through the injection channel; Step S4, observe whether the injection plastic flows out of the overflow port. If so, execute the following Step S5; Step S5, close the overflow port; Step S6, continue to inject the injection plastic into the inner cavity through the injection channel and maintain for a set time; Step S7, close the injection channel. Description of the Drawings

[0018] Figure 1 It is a cross-sectional view perpendicular to the axial direction of a specific embodiment of the preparation mold provided by the present invention;

[0019] Figure 2 is Figure 1 a partial enlarged view of the butt joint of the first mold body and the second mold body in

[0020] Figure 3 It is an axial sectional view of a specific embodiment of the preparation mold provided by the present invention;

[0021] Figure 4 It is a structural schematic diagram of the second mold body;

[0022] Figure 5 is Figure 4 a partial enlarged view of the second end docking member in

[0023] Figure 6 It is a flow schematic diagram of the method for using the preparation mold provided by the present invention.

[0024] The descriptions of the reference numerals are as follows:

[0025] 1 outer mold, 11 injection channel, 11a injection inlet, 11b injection outlet, 111 inlet section, 112 outlet section, 112a first sub-section, 112b second sub-section, 112c blocking surface, 12 first mold body, 121 first docking surface, 121a first groove, 121b second groove, 13 second mold body, 131 second docking surface, 132 second end docking member, 132a clamping groove, 132b positioning portion, 14 sealing member, 15 overflow port;

[0026] 2 core mold;

[0027] A inner cavity. Detailed Embodiment

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] In the embodiments of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0030] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, "connected" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0031] The orientation terms mentioned in the embodiments of the present invention, such as "inner" and "outer", etc., are only with reference to the direction of the accompanying drawings. Therefore, the orientation terms used are for better and clearer description and understanding of the embodiments of the present invention, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the embodiments of the present invention. In addition, unless otherwise stated in this application, the "plurality" mentioned in this application means two or more.

[0032] In the description of the embodiments of the present invention, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device including such element.

[0033] Embodiment 1

[0034] Please refer to Figures 1 - 5 , Figure 1 which is a cross-sectional view perpendicular to the axial direction of a specific embodiment of the manufacturing mold provided by the present invention, Figure 2 is Figure 1 a partially enlarged view of the docking portion of the first mold body and the second mold body in Figure 3 which is an axial cross-sectional view of a specific embodiment of the manufacturing mold provided by the present invention, Figure 4 is a schematic structural view of the second mold body, Figure 5 is Figure 4 a partially enlarged view of the second end docking member in

[0035] As Figure 1 shown, the present invention provides a preparation mold for preparing composite products in the form of carbon fibers, such as carbon fiber beams and the like.

[0036] Specifically, the preparation mold includes an outer mold 1, and the outer mold 1 is configured with an injection channel 11; both ends of the injection channel 11 are respectively located on the outer wall surface and the inner wall surface of the outer mold 1. Combining Figure 2 , one end of the injection channel 11 located on the outer wall surface of the outer mold 1 is an injection inlet 11a, and one end of the injection channel 11 located on the inner wall surface of the outer mold 1 is an injection outlet 11b. The injection outlet 11b can communicate with the inner cavity A of the preparation mold; the injection plastic can enter the injection channel 11 from the injection inlet 11a and can be injected into the inner cavity A through the injection outlet 11b.

[0037] A blocking surface 112c is formed on the inner wall of the injection channel 11. The blocking surface 112c can form a blocking buffer for the injection plastic entering from the injection inlet 11a, so as to reduce the impact of the injection plastic with a relatively high pressure entering from the injection inlet 11a on the injection product, which is beneficial to improving the surface quality of the injection product.

[0038] Here, the embodiments of the present invention do not limit the specific formation manner of the blocking surface 112c. In actual applications, those skilled in the art can adjust according to needs as long as the related functions of the blocking surface 112c can be realized. For example, a shoulder can be formed on the inner wall of the injection channel 11, and the surface of the shoulder facing the injection inlet 11a can be used as the blocking surface 112c; or, the injection channel 11 can be a diversion channel (or a variable diameter channel). At this time, the inner wall surface of the injection channel 11 at the diversion position (or the variable diameter position) can be used as the blocking surface 112c.

[0039] In the embodiment of the attached drawings, as Figure 2 shown, the injection channel 11 can include an inlet section 111 and an outlet section 112 that are connected and communicated. Among them, the inlet section 111 can have the aforementioned injection inlet 11a, and the outlet section 112 can have the aforementioned injection outlet 11b; that is to say, the inlet section 111 is relatively close to the outer wall surface of the outer mold 1, and the outlet section 112 is relatively close to the inner wall surface of the outer mold 1. When specifically used, the inlet section 111 can be used to connect with an injection plastic injection device (such as a glue gun) to introduce the injection plastic into the injection channel 11. The structure and size of the inlet section 111 are related to the structure and size of the injection plastic injection device, which are not limited herein; for example, the inlet section 111 can be a circular hole with a diameter of 5 mm - 10 mm.

[0040] Specifically, the aforementioned blocking surface 112c can be formed on the inner wall of the outlet section 112, and at least a part of the axial projection of the inlet section 111 falls on the blocking surface 112c. In this way, the blocking surface 112c can block and buffer the injection molding material entering from the inlet section 111.

[0041] Specifically, in combination with Figure 2 , the outlet section 112 can include a first sub-section 112a and a second sub-section 112b that are connected and communicate with each other. There can be a step surface between the first sub-section 112a and the second sub-section 112b, and this step surface can be the blocking surface 112c. During specific injection molding operations, the injection molding material can flow from the inlet section 111 into the first sub-section 112a. Blocked by the blocking surface 112c, the injection molding material can be buffered and its flow direction adjusted within the first sub-section 112a, and its impact force is greatly reduced. Then, the injection molding material can enter the second sub-section 112b from the first sub-section 112a and enter the inner cavity A through the injection outlet 11b of the second sub-section 112b.

[0042] Furthermore, the outer mold 1 can include a first mold body 12 and a second mold body 13 that are butt-jointed. The inlet section 111 can be entirely arranged in the first mold body 12. In this way, it is convenient to ensure the circumferential sealing of the inlet section 111, and thus it is convenient to achieve the sealed connection between the inlet section 111 and the injection molding material injection device. The outlet section 112 can be formed by enclosing the first mold body 12 and the second mold body 13. In this way, it is convenient to process and form the relatively complex-structured outlet section 112.

[0043] It should be understood that the outer mold 1 can not only include the aforementioned first mold body 12 and second mold body 13, but also include other mold bodies. That is to say, in the circumferential direction, the outer mold 1 can be assembled by butt-jointing more mold bodies. In this way, the size of each mold body is relatively small, and the preparation of the mold body can be relatively simple. Of course, the outer mold 1 can also only include the aforementioned first mold body 12 and second mold body 13. This solution can be referred to Figure 1 . At this time, the number of mold bodies is relatively small, and the assembly of the outer mold 1 can be relatively simple.

[0044] Please continue to refer to Figure 2 . The first mold body 12 can have a first butting surface 121, and the second mold body 13 can have a second butting surface 131. The first mold body 12 and the second mold body 2 can be butted through the first butting surface 121 and the second butting surface 131 specifically.

[0045] The first docking surface 121 may be provided with a first groove 121a and a second groove 121b that communicate with each other. The first groove 121a may communicate with the inlet section 111, and the depth of the first groove 121a may be greater than that of the second groove 121b. In this way, a stepped surface may be formed between the first groove 121a and the second groove 121b. The first groove 121a, the second groove 121b, and the second docking surface 131 may enclose to form an outlet section 112. With this solution, the forming process of the outlet section 112 only requires machining of the first docking surface 121, without the need for machining of the second docking surface 131, and the processing and preparation of the outlet section 112 can be relatively simple.

[0046] It should be understood that in some other embodiments, the second docking surface 131 may also be provided with a groove to jointly enclose the outlet section 112 with the groove provided on the first docking surface 121, and this is also feasible.

[0047] In specific practice, the lengths of the first groove 121a and the second groove 121b may be greater than the radial dimension of the inlet section 111. With this solution, on the one hand, the injection pressure of the injection molding material can be reduced to a greater extent, thereby weakening the impact of the injection molding material on the surface of the injection molded product to improve the surface quality of the injection molded product; on the other hand, the position where the injection molding material enters the inner cavity A can be significantly increased, which is conducive to the uniform arrangement of the injection molding material inside the inner cavity A, and to a certain extent, this can also improve the molding quality of the injection molded product.

[0048] Here, the embodiments of the present invention do not limit the specific dimensions of the first groove 121a and the second groove 121b. In actual applications, those skilled in the art can adjust according to needs as long as the requirements of use can be met. As an exemplary illustration, the lengths of the first groove 121a and the second groove 121b can be basically consistent with the length of the outer mold 1. In this way, the outlet section 112 basically presents as a narrow slit, and the position where the injection molding material enters the inner cavity A can be maximally increased; the depth of the second groove 121b can be set to 3 mm - 6 mm to ensure the smoothness of the injection molding material entering the inner cavity A.

[0049] Furthermore, a sealing component 14 may be provided between the first mold body 12 and the second mold body 13 to ensure the sealing performance of the contact position between the first mold body 12 and the second mold body 13.

[0050] The types of the sealing component 14 can be diverse and are not limited herein. In actual applications, those skilled in the art can configure according to specific needs as long as the requirements of use can be met. For example, the sealing component 14 can adopt a sealing element made of a material with a certain elastic deformation ability such as rubber or latex, or the sealing component 14 can also adopt a sealing element in the form of a sealing filler.

[0051] In addition, the size of the sealing member 14 may not be limited either. During specific assembly, as Figure 2 shown, a receiving groove may be provided on the second docking surface 131 for installing the sealing member 14. The receiving groove may be a semi-circular groove with a radius of 5 mm - 8 mm. Of course, it may also be a groove with other dimensions, as long as it can meet the usage requirements.

[0052] Combined with Figure 2 , the sealing member 14 may be located outside the outlet section 112, so that leakage of the injection molding material at the outlet section 112 can be avoided. The distance between the sealing member 14 and the outlet section 112 is not limited here. For example, the distance between the receiving groove and the step surface may be between 5 mm - 40 mm. Of course, it may also be other values.

[0053] In some alternative embodiments, the manufacturing mold provided by the present invention may further include a core mold 2. The core mold 2 may be located inside the outer mold 1 and may enclose with the outer mold 1 to form the inner cavity A of the manufacturing mold. At this time, the injection molded product manufactured by the manufacturing mold provided by the present invention may be a hollow tubular beam. It should be understood that the manufacturing mold may also only include the outer mold 1. At this time, the manufactured injection molded product is a solid member.

[0054] Taking the manufacturing mold including the core mold 2 as an example, combined with Figure 4 and Figure 5 , the first mold body 12 may be provided with a first end docking member (not shown in the figure), the second mold body 13 may be provided with a second end docking member 132, and the first mold body 12 and the second mold body 13 may be docked through the first end docking member and the second end docking member 132 to define the end position of the injection molded product; and at least one of the first end docking member and the second end docking member 132 may be provided with a positioning portion 132b for positioning the core mold 2 so as to determine the position of the core mold 2 inside the outer mold 1.

[0055] Here, the embodiments of the present invention do not limit the specific structures of the first end docking member and the second end docking member 132. In practical applications, those skilled in the art can set them as needed, as long as they can meet the usage requirements. For example, combined with Figure 5 , the second end docking member 132 may be provided with a card slot 132a, and the first end docking member may be a clamping plate that can be inserted and assembled into the card slot 132a.

[0056] The outer mold 1 can also be configured with at least one overflow port 15 through which the injection plastic can be observed for its injection condition in the inner cavity A. In the injection channel 11 and the overflow port 15, at least the overflow port 15 can be provided with a switching valve, which can be a ball valve or the like for controlling the opening and closing of the overflow port 15 for subsequent injection molding operations. The overflow port 15 can specifically be a circular hole with a diameter of 8 mm - 20 mm. Of course, it can also be a pore structure with other shapes or sizes, which can be determined specifically according to the usage requirements.

[0057] The number of the overflow ports 15 can be multiple, and each overflow port 15 can be arranged at intervals circumferentially on a set cross-section, which can be a cross-section with a relatively large perimeter, for example. In this way, it is convenient to ensure the injection quality at the positions with relatively large sizes of the injection molded product. The number of the overflow ports 15 is not limited herein and can be 6, for example.

[0058] Of course, the arrangement position of the overflow ports 15 is not limited thereto, and it can also be distributed at intervals in the length direction of the outer mold 1, which is also feasible.

[0059] It should be understood that in addition to the structural parts described in the above various solutions, positioning parts and mold clamping parts can also be configured between the first mold body 12 and the second mold body 13. The positioning parts can specifically be in the forms of positioning bumps, positioning columns, positioning grooves, positioning holes, etc. to improve the docking accuracy between the first mold body 12 and the second mold body 13. The mold clamping parts can be structural parts such as bolt assemblies and clamping parts to ensure the reliability of the docking between the first mold body 12 and the second mold body 13. The specific structural forms, distribution positions, etc. of these parts are not the core points of this application, so they are not limited herein, but this does not mean that the preparation mold provided by this application does not include these parts.

[0060] Embodiment 2

[0061] Please refer to Figure 6 , Figure 6 which is a schematic flow chart of the usage method of the preparation mold provided by the present invention.

[0062] The present invention also provides a usage method of a preparation mold. Here, the preparation mold can specifically be the preparation mold involved in each implementation manner in Embodiment 1, and this preparation mold includes an outer mold 1 and a core mold 2. Of course, it can also only include the outer mold 1, and the outer mold 1 is configured with an injection channel 11 and an overflow port 15. Combining Figure 6 ,the above usage method includes the following steps S1 - step S7.

[0063] Step S1, configure the preparation mold. That is, assemble this preparation mold for use.

[0064] Step S2, evacuate the inner cavity A of the preparation mold through the overflow port 15 and maintain a set vacuum degree. In this way, it is convenient for the subsequent injection plastic to enter the inner cavity A. The set vacuum degree can specifically be -0.95 MPa, and of course, it can also be other pressure values.

[0065] Step S3, fill the inner cavity A with injection plastic through the injection channel 11.

[0066] Step S4, observe whether injection plastic flows out from the overflow port 15. If so, execute the following step S5; Step S5, close the overflow port 15.

[0067] It should be noted that if the number of overflow ports 15 is multiple, it is necessary to ensure that injection plastic overflows from each overflow port 15. When closing the overflow port 15, it can be the overflow port 15 where there is overflow, that is, first close this overflow port 15; or, it can also be that when injection plastic overflows from all overflow ports 15, then close each overflow port 15 uniformly.

[0068] Step S6, continue to inject injection plastic into the inner cavity A through the injection channel 11 for a set time. In this way, the density of the injection molded product can be improved. The above set time can specifically be 5 min - 10 min, and of course, it can also be other times.

[0069] Step S7, close the injection channel 11. After that, temperature rising treatment can be carried out to drive the injection plastic to cure. Of course, other methods can also be used to drive the injection plastic to cure.

[0070] The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and retouches can still be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. A preparation mold, characterized in that, It includes an outer mold (1), the outer mold (1) is configured with an injection channel (11), both ends of the injection channel (11) respectively form an injection inlet (11a) and an injection outlet (11b), the injection inlet (11a) is located on the outer wall surface of the outer mold (1), the injection outlet (11b) is located on the inner wall surface of the outer mold (1), a blocking surface (112c) is formed on the inner wall of the injection channel (11), and the blocking surface (112c) can block the injection plastic entering from the injection inlet (11a); The injection channel (11) includes a connected inlet section (111) and an outlet section (112), the inlet section (111) has the injection inlet (11a), the outlet section (112) has the injection outlet (11b), the blocking surface (112c) is formed on the inner wall of the outlet section (112), and the projection of the inlet section (111) along its axis at least partially falls on the blocking surface (112c); The outlet section (112) includes a connected first sub-section (112a) and a second sub-section (112b), there is a stepped surface between the first sub-section (112a) and the second sub-section (112b), and the stepped surface is the blocking surface (112c).

2. The mold prepared according to claim 1, characterized in that, The outer mold (1) includes a first mold body (12) and a second mold body (13) that are butt-jointed, the entire inlet section (111) is arranged in the first mold body (12), and the outlet section (112) is formed by enclosing the first mold body (12) and the second mold body (13).

3. The mold prepared according to claim 2, wherein The first mold body (12) has a first docking surface (121), the second mold body (13) has a second docking surface (131), and the first docking surface (121) and the second docking surface (131) can be docked; The first docking surface (121) is provided with a connected first groove (121a) and a second groove (121b), the first groove (121a) is connected to the inlet section (111), the depth of the first groove (121a) is greater than that of the second groove (121b), a stepped surface is formed between the first groove (121a) and the second groove (121b), and the first groove (121a), the second groove (121b) and the second docking surface (131) enclose to form the outlet section (112).

4. The mold preparation according to claim 3, characterized in that, The lengths of the first groove (121a) and the second groove (121b) are greater than the radial dimension of the inlet section (111).

5. The mold preparation according to claim 2, characterized in that, A sealing member (14) is arranged between the first mold body (12) and the second mold body (13).

6. The mold preparation according to claim 2, characterized in that, The first mold body (12) is provided with a first end docking member, the second mold body (13) is provided with a second end docking member (132), and the first mold body (12) and the second mold body (13) are docked through the first end docking member and the second end docking member (132); The preparation mold further includes a core mold (2), and at least one of the first end docking member and the second end docking member (132) is provided with a positioning portion (132b) for positioning the core mold (2).

7. The mold preparation according to any one of claims 1-6, characterized in that, The outer mold (1) is further configured with at least one overflow port (15), and among the injection channel (11) and the overflow port (15), at least the overflow port (15) is provided with a switching valve.

8. The mold preparation according to claim 7, characterized in that, The number of the overflow ports (15) is multiple, and the overflow ports (15) are arranged at intervals along the circumferential direction on a set cross section.

9. A method of using a manufacturing die, characterized in that, The preparation mold is the preparation mold according to any one of claims 1-8, the outer mold (1) is configured with an overflow port (15), and the usage method includes the following steps: Step S1, configure the preparation mold; Step S2, evacuate the inner cavity (A) of the preparation mold through the overflow port (15) and maintain a set vacuum degree; Step S3, fill the inner cavity (A) with injection molding material through the injection channel (11); Step S4, observe whether the injection molding material flows out of the overflow port (15), if so, execute the following step S5; Step S5, close the overflow port (15); Step S6, continue to inject the injection molding material into the inner cavity (A) through the injection channel (11) and continue for a set time; Step S7, close the injection channel (11).

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