Mold structure for increasing side pressure of a molded carbon fiber product

Abstract

The application discloses a mold structure for increasing side pressure of a molded carbon fiber product, which comprises an upper mold and a lower mold, the top of the lower mold is provided with a molding groove, the molding groove is composed of a groove bottom and U-shaped grooves symmetrically arranged on both sides of the groove bottom, the inner side groove wall of the U-shaped groove is flush with the groove bottom, and the outer side groove wall of the U-shaped groove is flush with the top of the lower mold; the mold structure further comprises an inner side pressing block and an outer side pressing block matched with the U-shaped groove, the height of the inner side pressing block is greater than the height of the inner side groove wall, and the opposite side surfaces of the inner side pressing block and the outer side pressing block extend in a direction away from each other in an inclined manner, thereby forming a trapezoidal gap; the bottom of the upper mold is provided with a first molding protrusion matched with the groove bottom and a second molding protrusion matched with the trapezoidal gap, when the mold is closed, the first molding protrusion cooperates with the groove bottom to form a middle part of the product, and the second molding protrusion synchronously extrudes the inner side pressing block and the outer side pressing block to form a reverse buckling part of the product, so that the surface quality of the product is ensured by simultaneously applying the force in the upward and downward directions and the side pressure.

Description

Technical Field

[0001] This utility model relates to the field of mold equipment technology, and in particular to a mold structure for increasing the side pressure of compression-molded carbon fiber products. Background Technology

[0002] In the field of composite and polymer material molding, including carbon fiber products, compression molding is a conventional molding process. By heating and pressurizing, the material flows and solidifies in the mold cavity to obtain the product of the desired shape. For compression molding of carbon fiber products, the flexible, plate-shaped semi-finished product is first placed on the lower mold, and then the press drives the upper mold to press down and form the product.

[0003] Because the pressure provided by the press is only in the vertical direction, the pressure is mainly concentrated in the central area, and the side pressure is insufficient, making it difficult for the resin to flow and fill to the sides. Especially for the compression molding of carbon fiber composite products with narrow areas, inverted or fine texture requirements, conventional mold molding is prone to problems of flow and filling difficulties, resulting in poor surface quality. Utility Model Content

[0004] This application provides a mold structure for increasing the side pressure of compression-molded carbon fiber products, which can provide additional side pressure during the upper and lower mold closing process to ensure the surface quality of the carbon fiber products.

[0005] This application provides a mold structure for increasing the side pressure of compression-molded carbon fiber products, including an upper mold and a lower mold that cooperate with each other. The upper mold is driven by a press to move directionally up and down relative to the lower mold. The top of the lower mold is provided with a molding groove, which is composed of a groove bottom and U-shaped grooves symmetrically arranged on both sides of the groove bottom. The inner wall of the U-shaped groove is flush with the groove bottom, and the outer wall of the U-shaped groove is flush with the top of the lower mold. The mold structure also includes an inner pressure block and an outer pressure block that cooperate with the U-shaped groove, wherein the height of the inner pressure block is greater than the height of the inner groove wall, and the opposite sides of the inner pressure block and the outer pressure block extend inclined in a direction away from each other to form a trapezoidal gap. The bottom of the upper mold is provided with a first forming protrusion that mates with the bottom of the groove, and a second forming protrusion that mates with the trapezoidal gap. When the mold is closed, the first forming protrusion can mate with the bottom of the groove to form the middle part of the product, and the second forming protrusion can simultaneously squeeze the inner pressure block and the outer pressure block to form the undercut part of the product.

[0006] In one possible implementation, the inner pressure block is L-shaped, including a vertical part and a horizontal part that are vertically connected by an arc transition. The vertical part cooperates with the outer pressure block to form the trapezoidal gap. After the upper mold and the lower mold are closed in place, the horizontal part abuts against the top of the middle part of the product. The upper mold is provided with a clearance groove that cooperates with the horizontal part.

[0007] In one possible implementation, the horizontal portion has a ramp structure on the side away from the vertical portion, and the ramp structure gradually slopes inward from top to bottom.

[0008] In one possible implementation, the outer pressure block is flush with the top of the lower mold.

[0009] In one possible implementation, the top of the lower mold has a clearance notch on the side near the U-shaped groove. After the upper mold and the lower mold are closed in place, the clearance notch cooperates with the upper mold to form a clearance groove.

[0010] Beneficial effects: Compared with the prior art, the mold structure provided in this application for increasing the side pressure of compression-molded carbon fiber products can simultaneously apply vertical pressure and horizontal side pressure during the mold closing process by cooperating with the upper mold, lower mold, inner pressure block and outer pressure block. With the cooperation of the first molding protrusion and the bottom of the groove and the cooperation of the second molding protrusion and the trapezoidal gap, the middle part and the undercut part of the carbon fiber product are formed in one step, thereby ensuring the surface quality of the carbon fiber product.

[0011] These and other objects, features and advantages of this utility model will be fully realized through the following detailed description. Attached Figure Description

[0012] Fig. 1 A three-dimensional structural schematic diagram of the mold structure used in this application to increase the lateral pressure of compression-molded carbon fiber articles is shown.

[0013] Fig. 2 The diagram shows a front view of the mold structure used in this application to increase the lateral pressure of compression-molded carbon fiber articles.

[0014] Fig. 3 An exploded structural diagram of the mold structure used in this application to increase the lateral pressure of compression-molded carbon fiber articles is shown. Detailed Implementation

[0015] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0016] Those skilled in the art should understand that, in the disclosure of this specification, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0017] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0018] refer to Figs. 1 to 3 This application provides a mold structure for increasing the lateral pressure of a compression-molded carbon fiber product, including an upper mold 10 and a lower mold 20 that cooperate with each other. The upper mold 10 is driven by a press to move vertically relative to the lower mold 20, and the compression molding of the carbon fiber product 30 is completed by the closing of the upper mold 10 and the lower mold 20. The top of the lower mold 20 is provided with a molding groove 201, which is composed of a groove bottom 21 and U-shaped grooves 202 symmetrically arranged on both sides of the groove bottom 21. The inner wall of the U-shaped groove 202 is flush with the groove bottom 21, and the outer wall of the U-shaped groove 202 is flush with the top of the lower mold 20, that is, the entire molding groove 201 is formed by a recess in the top of the lower mold 20.

[0019] The mold structure also includes an inner pressure block 40 and an outer pressure block 50 that cooperate with the U-shaped groove 202. The height of the inner pressure block 40 is greater than the height of the inner groove wall to ensure the complete forming of the inner portion 321 of the undercut portions 32 at both ends of the product 30. In addition, the opposing sides of the inner pressure block 40 and the outer pressure block 50 extend at an angle away from each other, forming a trapezoidal gap 401.

[0020] The bottom of the upper mold 10 is provided with a first forming protrusion 11 that cooperates with the groove bottom 21. At the same time, the bottom of the upper mold 10 is also provided with a second forming protrusion 12 that cooperates with the trapezoidal gap 401. When the mold is closed, the middle part 31 of the product can be formed by the first forming protrusion 11 cooperating with the groove bottom 21. The second forming protrusion 12 can simultaneously squeeze the inner pressure block 40 and the outer pressure block 50 to form the undercut part 32 of the product.

[0021] During use, before compression molding, the carbon fiber semi-finished product is flexible and plate-shaped. The semi-finished product is placed on top of the lower mold 20, directly facing the molding groove 201. It naturally rests against the bottom 21 of the groove and the U-shaped grooves 202 on both sides. Then, the inner pressing block 40 and the outer pressing block 50 are placed in the U-shaped grooves 202 on both sides, respectively. The positions of the inner pressing block 40 and the outer pressing block 50 do not need to be strictly defined; they only need to be within the U-shaped grooves 202. Even if the inner pressing block 40 and the outer pressing block 50 are moved left or right, their trapezoidal gap 401 remains within the second molding protrusion 12. Within the range, as the upper mold 10 is driven down by the press, the second forming protrusion 12 is inserted into the trapezoidal gap 401, while the first forming protrusion 11 gradually approaches the bottom of the groove. Finally, the mold is closed. Through the cooperation of the first forming protrusion 11 and the bottom of the groove 21 and the cooperation of the second forming protrusion 12 and the trapezoidal gap 401, the middle part 31 and the two undercut parts 32 of the carbon fiber product 30 are formed in one step. That is, the carbon fiber product 30 can be molded in one step, with high molding efficiency. At the same time, since the pressure in the vertical direction and the lateral pressure in the horizontal direction are applied at the same time during the mold closing process, the surface quality of the carbon fiber product 30 can be ensured.

[0022] In one embodiment, the inner pressure block 40 is L-shaped, including a vertical portion 41 and a horizontal portion 42 connected by a circular arc transition. The vertical portion 41 cooperates with the outer pressure block 50 to form the trapezoidal gap 401. At the same time, after the upper mold 10 and the lower mold 20 are closed, the horizontal portion 42 abuts against the top of the middle portion 31 of the product. The upper mold 10 is provided with a clearance groove 101 that cooperates with the horizontal portion 42. This ensures a good transition between the middle portion 31 and the undercut portion 32 of the carbon fiber product 30 through the cooperation of the horizontal portion 42 and the vertical portion 41, and ensures the surface molding quality of the inner portion 321 of the undercut portion 32.

[0023] In one embodiment, the horizontal portion 42 is provided with a ramp structure 421 on the side away from the vertical portion 41, wherein the ramp structure 421 gradually slopes inward from top to bottom to facilitate the smooth pressing of the upper mold 10 on the horizontal portion 42 to complete the mold closing.

[0024] In one embodiment, the outer pressure block 50 is flush with the top of the lower mold 20, thereby ensuring the surface molding quality of the outer portion 322 of the undercut portion 32.

[0025] It is worth mentioning that, considering that during the molding process, there is usually a slight excess of material to ensure that the product can be fully formed, if the cavity space is too small during extrusion, some material may be squeezed into the mating surfaces of the upper mold 10 and the lower mold 20, making it difficult for the mold structure to close smoothly, thus affecting the molding quality. Therefore, the top of the lower mold 20 is provided with a clearance notch 22 on the side near the U-shaped groove 202. After the upper mold 10 and the lower mold 20 are closed, the clearance notch 22, together with the upper mold 10, forms an allowance groove. This allows for the formation of an allowance groove to hold excess material when there is a lot of material, preventing excess material from affecting the surface mating accuracy between the upper mold 10 and the lower mold 20.

[0026] It should be noted that the terms "first" and "second" used in this application are for descriptive purposes only and do not indicate any order. They should not be construed as indicating or implying relative importance, and can be interpreted as names.

[0027] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A mold structure for increasing the lateral pressure of compression-molded carbon fiber articles, comprising an upper mold and a lower mold that cooperate with each other, wherein the upper mold is driven by a press to move directionally up and down relative to the lower mold, characterized in that, The top of the lower mold is provided with a forming groove, which is composed of a groove bottom and U-shaped grooves symmetrically arranged on both sides of the groove bottom. The inner wall of the U-shaped groove is flush with the groove bottom, and the outer wall of the U-shaped groove is flush with the top of the lower mold. The mold structure also includes an inner pressure block and an outer pressure block that cooperate with the U-shaped groove, wherein the height of the inner pressure block is greater than the height of the inner groove wall, and the opposite sides of the inner pressure block and the outer pressure block extend inclined in a direction away from each other to form a trapezoidal gap. The bottom of the upper mold is provided with a first forming protrusion that matches the bottom of the groove, and a second forming protrusion that matches the trapezoidal gap. When the mold is closed, the first forming protrusion matches the middle part of the product formed by the bottom of the groove, and the second forming protrusion simultaneously squeezes the undercut part of the product formed by the inner pressure block and the outer pressure block.

2. The mold structure for increasing the lateral pressure of compression-molded carbon fiber products as described in claim 1, characterized in that, The inner pressure block is L-shaped, including a vertical part and a horizontal part that are connected vertically by an arc transition. The vertical part cooperates with the outer pressure block to form the trapezoidal gap. After the upper mold and the lower mold are closed in place, the horizontal part abuts against the top of the middle part of the product. The upper mold is provided with a clearance groove that cooperates with the horizontal part.

3. The mold structure for increasing the lateral pressure of compression-molded carbon fiber products as described in claim 2, characterized in that, The horizontal part is provided with a sloping structure on the side away from the vertical part, and the sloping structure gradually slopes inward from top to bottom.

4. The mold structure for increasing the lateral pressure of compression-molded carbon fiber products as described in claim 1, characterized in that, The outer pressure block is flush with the top of the lower mold.

5. The mold structure for increasing the side pressure of compression-molded carbon fiber products as described in claim 4, characterized in that, The top of the lower mold has a clearance notch on the side near the U-shaped groove. After the upper mold and the lower mold are closed in place, the clearance notch cooperates with the upper mold to form a clearance groove.

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