A composite material wet compression molding die and use method thereof

Abstract

The present application provides a composite material wet compression molding die and a method for using the same, wherein the die comprises an upper die body and a lower die body, each of which is provided with a heating oil passage; the die cavity surface of the upper die body is provided with a circle of scored grooves and a circle of baffles; the baffles are located on the side of the scored grooves away from the center of the die cavity; a clamping assembly and a blank top block are also provided on the upper die body; the clamping assembly is located on the side of the baffles away from the scored grooves; the blank top block is located between the clamping assembly and the baffles; and a corresponding groove is provided on the lower die body corresponding to the blank top block. According to the technical solution provided in the embodiment of the present application, the blank can be first pressed against the lower die body during the mold closing process by means of the clamping assembly and the blank top block, and then part of the blank can be pressed into the groove, so that the loose blank becomes taut, effectively solving the problem of local fiber accumulation and wrinkles; through the setting of the baffles, the flow of the resin is blocked, and the mold closing force acts on the resin, which can compress the bubbles inside the resin, so that the volume of the bubbles is significantly reduced or disappears.

Description

Technical Field

[0001] The present application relates to the technical field of wet compression molding, and in particular to a composite material wet compression molding die and a method for using the same. Background Art

[0002] The wet molding process has been widely used in the field of automotive composite materials due to its efficiency and cost advantages. During the wet molding process, the resin flows and infiltrates the fibers under the huge pressure during the closing process of the upper and lower molds. Finally, the resin solidifies to form a composite material that matches the mold cavity. For relatively simple configurations, the conformability of the continuous fiber fabric effectively ensures the flatness of the fibers of the composite parts. For relatively complex configurations, the continuous fiber fabric cannot effectively unfold along the mold surface, resulting in local fiber accumulation and fiber wrinkles. In addition, there is a phenomenon of air bubbles being drawn into the resin flow process. The wet molding process cannot wrap the entire blank in a closed environment, and the porosity cannot be effectively controlled by methods such as vacuuming. Summary of the invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a composite material wet compression molding die and a method of using the same.

[0004] In the first aspect, the present application provides a composite material wet compression molding die, comprising an upper mold body and a lower mold body, each of which is provided with a heating oil channel; the mold cavity surface of the upper mold body is provided with a circle of scored grooves and a circle of baffles; the baffles are located on the side of the scored grooves away from the center of the mold cavity; the upper mold body is also provided with a clamping assembly and a blank top block; the clamping assembly is located on the side of the baffles away from the scored grooves; the blank top block is located between the clamping assembly and the baffles; and the lower mold body is provided with a corresponding groove corresponding to the blank top block.

[0005] Furthermore, the clamping assembly includes a programmable oil cylinder and a clamping end; the programmable oil cylinder is fixedly installed on the upper mold body; the clamping end is annular and connected to the programmable oil cylinder through a connecting rod.

[0006] Furthermore, a corresponding annular groove is provided on the upper mold body corresponding to the clamping end; a mounting hole for mounting the programmable oil cylinder is provided in the annular groove; and the mounting holes are arranged along the circumference of the annular groove.

[0007] Furthermore, the blank top block is in the same direction as the connecting rod axis; when the connecting rod is in a fully extended state, the protruding height of the clamping end is relatively higher than the protruding height of the blank top block; when the connecting rod is in a fully retracted state, the clamping end is located in the annular groove.

[0008] Furthermore, the blank top block is fixedly mounted on the upper mold body, and the protruding height is relatively higher than the thickness of the mold cavity.

[0009] Furthermore, the baffle is integrally formed with the mold; the width of the protruding end of the baffle is greater than 2 mm, and the thickness is 0.3-0.6 times the thickness of the mold cavity.

[0010] In a second aspect, the present application provides a method for using a composite material wet compression molding mold, comprising the following steps:

[0011] Installation: Install the upper mold body and the lower mold body on the wet molding equipment accordingly; connect the heating oil channel to the mold temperature controller; connect the clamping assembly to the wet molding control system;

[0012] Blank loading: Place the blank on the lower die;

[0013] Reset: Adjust the program-controlled oil cylinder to make the clamping end in the extended state;

[0014] Pressing: During the closing process of the upper and lower mold bodies, the clamping assembly first contacts the blank and is pressed against the lower mold body; the entire process uses a constant pressure mode to control the program-controlled oil cylinder. When the pressure increases to the set value, the pressure device maintains a constant pressure under the control of the program, and the protruding length of the clamping end gradually decreases during the closing process;

[0015] Tightening: The top block of the blank contacts the blank again and presses the blank into the groove, thereby gradually tightening the loose blank;

[0016] Molding: The upper mold body and the lower mold body continue to close the mold and compress the blank until the mold is completely closed to complete the curing molding.

[0017] The advantages and positive effects of this application are:

[0018] This technical solution can first press the blank against the lower mold body and then press part of the blank into the groove during the mold closing process through the clamping assembly and the blank top block, so that the loose blank becomes tight, effectively solving the problem of local fiber accumulation and wrinkles; through the setting of the baffle, the fiber volume fraction of the area contacted by the baffle is much higher than the fiber volume fraction of the area inside the baffle, and naturally, the permeability of the area contacted by the baffle is much lower than the permeability of the area inside the resin baffle, and the resin flow is seriously blocked in this area. In this state, the mold closing force will act on the resin, and the pressure of the resin fluid will increase sharply, thereby compressing the bubbles inside the resin, causing the volume of the bubbles to be significantly reduced or disappear. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a composite material wet compression molding die provided in an embodiment of the present application;

[0020] Figure 2 A schematic structural diagram of the clamping end of the composite material wet compression molding die provided in an embodiment of the present application.

[0021] The text markings in the figure are as follows: 100 - upper mold body; 110 - scored groove; 120 - stop bar; 130 - blank top block; 140 - programmable oil cylinder; 141 - connecting rod; 142 - clamping end; 143 - annular groove; 200 - lower mold body; 210 - groove; 300 - heating oil channel; 400 - blank. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is described in detail below in conjunction with the accompanying drawings. The description in this section is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present application.

[0023] First, please refer to Figure 1 The present embodiment provides a composite material wet compression molding die, comprising an upper die body 100 and a lower die body 200; heating oil passages 300 are arranged inside the upper die body 100 and the lower die body 200, and the heating oil passages 300 are evenly arranged inside the upper die body 100 and the lower die body 200; a circle of scored grooves 110 and a circle of retaining bars 120 are arranged on the side of the upper die body 100 close to the lower die body 200; the scored grooves 110 are located between the mold cavity and the retaining bars 120, and are the reference lines for cutting the final product; the retaining bars 120 are away from the scored grooves 110. A blank top block 130 and a clamping assembly are also provided on one side; the clamping assembly is used to fix the blank 400 on the lower mold body 200; the blank top block 130 is located between the clamping assembly and the baffle 120, and the arrangement position and specific protruding height of the blank top block 130 are determined according to the product configuration; a corresponding groove 210 is provided on the lower mold body 200 corresponding to the blank top block 130, and the loose blank 400 is pressed into the groove 210 through the blank top block 130, so that the loose blank can be tightened to avoid the problems of fiber accumulation and wrinkles.

[0024] In a preferred embodiment, the interface of the scored groove 110 is trapezoidal, with a groove width of 1-2 mm, a groove depth of 1-2 mm, and an angle greater than 30°.

[0025] In a preferred embodiment, the baffle 120 is integrally formed with the mold, and is made of the same material as the mold, and the distance between the baffle 120 and the scored groove 110 is greater than 20 mm; the cross-section of the baffle 120 is trapezoidal, the angle is greater than 60°, the width of the top of the protruding end is greater than 2 mm, and the height is 0.3-0.6 times the thickness of the mold cavity.

[0026] Please refer to further Figure 2In a preferred embodiment, the clamping assembly includes a programmable oil cylinder 140 arranged along the circumference of the mold cavity, and a ring-shaped clamping end 142; a connecting rod 141 is provided on the programmable oil cylinder 140, and the clamping end 142 is fixedly installed on the connecting rod 141. During the mold closing process, the protruding length of the clamping end 142 is the largest, first contacts the blank 400, and presses the blank 400 tightly against the lower mold body 200; as the mold is further closed, the pressure further increases, and the programmable oil cylinder 140 maintains a constant pressure under the control of the program, and the protruding length of the clamping end 142 gradually decreases during the mold closing process.

[0027] In a preferred embodiment, a corresponding annular groove 143 is provided on the upper mold body 100 corresponding to the clamping end 142; a corresponding mounting hole is provided in the annular groove 143 corresponding to the programmable oil cylinder 140; the mounting holes are arranged along the circumference of the annular groove 143, and the programmable oil cylinder 140 is fixedly installed in the mounting holes.

[0028] In a preferred embodiment, the axial direction of the blank top block 130 is the same as that of the connecting rod 141. When the connecting rod 141 is fully extended, the protruding height of the clamping end 142 is relatively higher than the protruding height of the blank top block 130; when the connecting rod 141 is fully retracted, the clamping end 142 is located in the annular groove 143.

[0029] In a preferred embodiment, the blank top block 130 is fixedly mounted on the upper mold body 100, and the protruding height is relatively higher than the thickness of the mold cavity.

[0030] In a second aspect, this embodiment provides a method for using a composite material wet compression molding mold, comprising the following steps:

[0031] Installation: Install the upper mold body and the lower mold body on the wet molding equipment accordingly; connect the heating oil channel to the mold temperature controller; connect the clamping assembly to the wet molding control system;

[0032] Blank loading: Place the blank on the lower die;

[0033] Reset: Adjust the program-controlled oil cylinder to make the clamping end in the extended state;

[0034] Pressing: During the closing process of the upper and lower mold bodies, the clamping assembly first contacts the blank and is pressed against the lower mold body; the entire process uses a constant pressure mode to control the program-controlled oil cylinder. When the pressure increases to the set value, the pressure device maintains a constant pressure under the control of the program, and the protruding length of the clamping end gradually decreases during the closing process;

[0035] Tightening: The top block of the blank contacts the blank again and presses the blank into the groove, thereby gradually tightening the loose blank;

[0036] Molding: The upper mold body and the lower mold body continue to close the mold and compress the blank until the mold is completely closed to complete the curing molding.

[0037] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can also make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A composite material wet compression molding die, characterized in that: The invention comprises an upper mold body (100) and a lower mold body (200) each provided with a heating oil passage (300); the mold cavity surface of the upper mold body (100) is provided with a circle of scored grooves (110) and a circle of retaining strips (120); the retaining strips (120) are located on the side of the scored grooves (110) away from the center of the mold cavity; the upper mold body (100) is also provided with a clamping assembly and a blank top block (130); the clamping assembly is located on the side of the retaining strip (120) away from the scored grooves (110); the blank top block (130) is located between the clamping assembly and the retaining strip (120); the lower mold body (200) is provided with a corresponding groove (210) corresponding to the blank top block (130); The clamping assembly comprises a programmable oil cylinder (140) and a clamping end head (142); the programmable oil cylinder (140) is fixedly mounted on the upper mold body (100); the clamping end head (142) is annular and connected to the programmable oil cylinder (140) via a connecting rod (141); The upper mold body (100) is provided with a corresponding annular groove (143) corresponding to the clamping end head (142); a mounting hole for mounting the programmable oil cylinder (140) is provided in the annular groove (143); the mounting holes are arranged along the circumference of the annular groove (143); The axial directions of the blank top block (130) and the connecting rod (141) are the same; when the connecting rod (141) is in a fully extended state, the protruding height of the clamping end head (142) is relatively higher than the protruding height of the blank top block (130); when the connecting rod (141) is in a fully retracted state, the clamping end head (142) is located in the annular groove (143); The blank top block (130) is fixedly mounted on the upper mold body (100), and its protruding height is relatively higher than the thickness of the mold cavity.

2. The composite material wet compression molding die according to claim 1, characterized in that: The baffle (120) is integrally formed with the mold; the width of the protruding end of the baffle (120) is greater than 2 mm, and the thickness is 0.3-0.6 times the thickness of the mold cavity.

3. A method for using the composite material wet compression molding mold according to any one of claims 1 to 2, characterized in that: The following steps are involved: Installation: the upper mold body (100) and the lower mold body (200) are installed on the wet molding equipment accordingly; the heating oil channel (300) is connected to the mold temperature controller; the clamping assembly is connected to the control system of the wet molding; Blank loading: placing the blank (400) on the lower mold body (200); Reset: adjust the program-controlled oil cylinder (140) so that the clamping end (142) is in the extended state; Pressing: During the process of closing the upper mold body (100) and the lower mold body (200), the clamping assembly first contacts the blank (400) and is pressed against the lower mold body (200); the entire process uses a constant pressure mode to control the program-controlled oil cylinder (140); when the pressure increases to a set value, the pressure-applying device maintains a constant pressure under the control of the program, and the protruding length of the clamping end gradually decreases during the closing process; Tightening: the blank top block (130) contacts the blank (400) again and presses the blank (400) into the groove (210), thereby gradually tightening the loose blank; Molding: The upper mold body (100) and the lower mold body (200) continue to close the mold and compress the blank (400) until the mold is completely closed, completing the curing molding.

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