CN111791418A - Compression molding die and compression molding method - Google Patents

Abstract

The invention discloses a compression molding die and a compression molding method, wherein the compression molding die comprises: the outer die is internally provided with a closed cavity, and the wall of the closed cavity is provided with an air suction hole communicated with the outside; the inner die is arranged on the bottom wall of the closed cavity, a die cavity for placing a material to be molded is formed in the inner die, and the die cavity is communicated with the closed cavity; and the molding assembly is movably arranged on the top wall of the closed cavity to be close to or far away from the mold cavity. Namely, the technical scheme of the invention can reduce the porosity of the carbon fiber product and ensure the performance of the carbon fiber product.

Description

Compression molding die and compression molding method

Technical Field

The invention relates to the technical field of compression molding, in particular to a compression molding die and a compression molding method.

Background

Most of the existing carbon fiber products are prepared by adopting a die pressing forming method, and the die pressing forming method enables the carbon fiber products to be formed by pressurizing in a closed die cavity. However, since the gas in the carbon fiber resin raw material is not discharged before the press molding, a large amount of bubbles are present in the intermediate layer and the surface of the carbon fiber product obtained by the press molding, and the porosity of the carbon fiber product is high, thereby affecting the performance of the carbon fiber product.

Disclosure of Invention

The invention mainly aims to provide a compression molding die, which aims to reduce the porosity of a carbon fiber product and ensure the performance of the carbon fiber product.

In order to achieve the above object, the present invention provides a compression molding die comprising:

the outer die is internally provided with a closed cavity, and the wall of the closed cavity is provided with an air suction hole communicated with the outside;

the inner die is arranged on the bottom wall of the closed cavity, a die cavity for placing a material to be molded is formed in the inner die, and the die cavity is communicated with the closed cavity;

and the molding assembly is movably arranged on the top wall of the closed cavity to be close to or far away from the mold cavity.

Optionally, the outer mold includes a mold plate and a mold cover, the mold cover is detachably covered on the mold plate and encloses with the mold cover to form the closed cavity, the inner mold is disposed on a surface of the mold plate facing the closed cavity, and the mold pressing assembly is movably disposed on the mold cover.

Optionally, the mold pressing assembly includes a driving rod movably inserted through the mold cover and a mold pressing plate provided at an end of the driving rod facing the mold plate.

Optionally, the die cover is provided with a through hole on the surface facing the die plate, a first sealing ring is installed in the through hole, and the driving rod is movably arranged in the first sealing ring in a penetrating manner.

Optionally, the compression molding die further includes a driving member, the driving member is disposed on a side of the mold plate away from the closed cavity and is in transmission connection with the mold plate to drive the mold plate to approach or be away from the compression molding assembly.

Optionally, the surface of the die cover facing the die plate is concavely provided with a slot, the slot surrounds the inner die, a second sealing ring is installed in the slot, and the die cover is detachably covered on the die plate through the second sealing ring.

Optionally, the inner mold is formed with a heat flow channel, the heat flow channel is spaced from the mold cavity, the outer mold is mounted with a heat flow pipe, the heat flow pipe is communicated with the heat flow channel, and an end of the heat flow pipe departing from the heat flow channel is disposed outside the outer mold.

Optionally, the heat flow channels are equally spaced from the mould cavity.

Optionally, the inner mold includes an upper mold and a lower mold which are arranged oppositely, the upper mold and the lower mold are clamped to form the mold cavity, the upper mold and the lower mold are both provided with the heat flow channels, the outer mold is provided with two heat flow pipes, and each heat flow channel is communicated with one heat flow pipe.

The invention also provides a compression molding method, which comprises the following steps:

and placing the material to be molded in the mold cavity of the inner mold, communicating the air exhaust hole with vacuum-pumping equipment, vacuumizing the mold cavity, and controlling the mold pressing assembly to be close to the mold cavity after the vacuum degree of the mold cavity reaches a preset condition so as to mold the material to be molded in the mold cavity.

According to the technical scheme, after the air exhaust holes are communicated with the vacuumizing equipment, air in the mold cavity flows through the closed cavity and then flows out of the air exhaust holes, so that the mold cavity reaches a vacuum condition, the mold pressing assembly is controlled to be close to the inner mold, the material to be molded in the mold cavity is subjected to mold pressing, and the mold pressing of the material to be molded under the vacuum condition is realized. Therefore, when the carbon fiber product forming mold is applied to carbon fiber product forming, gas in the carbon fiber resin raw material is exhausted by vacuumizing, and the damage of the structure of the carbon fiber product formed by compression molding due to bubbles is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural view of a compression molding mold according to an embodiment of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Compression molding die	30a	Die cavity
10	Outer mould	30b	Heat flow channel
				10a	Closed chamber	31	Upper die
10b	Air extraction hole	33	Lower die
				11	Form panel	50	Molded component
13	Mould cover	51	Driving rod
				15	First seal ring	53	Moulded board
17	Second seal ring	60	Driving member
				30	Inner mould	70	Hot flow pipe
80	Drain pipe

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

The invention provides a compression molding die, aiming at realizing compression molding under the vacuum condition.

Referring to fig. 1, in an embodiment of the present invention, a molding die 100 includes:

the mold comprises an outer mold 10, wherein a closed cavity 10a is formed in the outer mold 10, and an air suction hole 10b used for being communicated with the outside is formed in the cavity wall of the closed cavity 10 a;

the inner die 30 is arranged on the bottom wall of the closed cavity 10a, a die cavity 30a for placing a material to be molded is formed in the inner die 30, and the die cavity 30a is communicated with the closed cavity 10 a;

a molding member 50, said molding member 50 being movably disposed on the top wall of said closed chamber 10a to be close to or far from said mold cavity 30 a.

According to the technical scheme, after the air exhaust holes 10b are communicated with the vacuumizing equipment, air in the mold cavity 30a flows out of the air exhaust holes 10b after flowing through the closed cavity 10a, so that the mold cavity 30a achieves a vacuum condition, and then the mold pressing assembly 50 is controlled to be close to the inner mold 30, so that the material to be molded in the mold cavity 30a is subjected to mold pressing forming, and the mold pressing forming of the material to be molded under the vacuum condition is achieved. Therefore, when the carbon fiber product forming mold is applied to carbon fiber product forming, gas in the carbon fiber resin raw material is exhausted by vacuumizing, and the damage of the structure of the carbon fiber product formed by compression molding caused by bubbles is avoided. It should be noted that, in the embodiment of the present invention, the mold is further provided with a gas pressure port, so that the gas blowing pipe communicates the gas pressure port with the gas nozzle of the material to be formed, so that the embodiment of the present invention realizes the forming of the hollow carbon fiber product, and the embodiment of the present invention is not limited thereto, and the above is within the protection scope of the embodiment of the present invention.

Referring to fig. 1, in an embodiment of the present invention, the outer mold 10 includes a mold plate 11 and a mold cover 13, the mold cover 13 detachably covers the mold plate 11 and encloses with the mold cover 13 to form the closed cavity 10a, the inner mold 30 is disposed on a surface of the mold plate 11 facing the closed cavity 10a, and the molding assembly 50 is movably disposed on the mold cover 13. Of course, the air exhaust hole may be disposed in the mold plate 11 or the mold cover 13, and the embodiment of the present invention is not limited thereto, and the above is within the protection scope of the embodiment of the present invention. According to the embodiment of the invention, the mold cover 13 is arranged to detachably cover the mold plate 11, and when the inner mold 30 needs to be taken and placed, the mold cover 13 covering the mold plate 11 is opened, so that the inner mold 30 is convenient to take and place; when the material to be molded needs to be molded, the mold cover 13 covers the mold plate 11, so that the mold cover 13 and the mold plate 11 form a closed space, the vacuum pumping operation of the mold cavity 30a is facilitated, and the vacuum compression molding of the material to be molded is realized.

Referring to fig. 1, in an embodiment of the present invention, the molding assembly 50 includes a driving rod 51 and a molding plate 53, the driving rod 51 is movably inserted through the mold cover 13, and the end of the driving rod 51 facing the mold plate 11 is provided with the molding plate 53. Of course, the embodiment of the present invention may further include a lifting mechanism, and the lifting mechanism may include a driving motor or a driving cylinder, as long as the driving rod 51 can be driven to approach or depart from the mold cavity 30a, and the embodiment of the present invention is not limited thereto, and the above is within the protection scope of the embodiment of the present invention. In the embodiment of the invention, the driving rod 51 drives the mold pressing plate 53 to be close to or far away from the mold cavity 30a, on one hand, the mold pressing plate 53 moves towards the direction close to the mold cavity 30a, so that the mold pressing plate 53 is pressed on the inner mold 30, the uniform compression of the material to be molded in the mold cavity 30a is ensured, and the rapid mold pressing of the material to be molded is realized; on the other hand, after the compression molding is finished, the driving rod 51 drives the mold pressing plate 53 to move towards the direction far away from the mold cavity 30a, so that the inner mold 30 is automatically decompressed, and the compression molding of the material to be molded is finished.

Referring to fig. 1, in an embodiment of the present invention, a through hole is formed in a surface of the mold cover 13 facing the mold plate 11, a first sealing ring 15 is installed in the through hole, and the driving rod 51 is movably inserted through the first sealing ring 15. According to the embodiment of the invention, the first sealing ring 15 is arranged, and the driving rod 51 penetrates through the first sealing ring 15 in the through hole, so that the sealing performance of the sealed cavity is ensured, and the movable arrangement of the driving rod 51 is realized, thereby ensuring the compression molding of the material to be molded under the vacuum condition.

Referring to fig. 1, in an embodiment of the present invention, the compression molding mold 100 further includes a driving member 60, wherein the driving member 60 is disposed on a side of the mold plate 11 facing away from the closed cavity 10a and is in transmission connection with the mold plate 11 to drive the mold plate 11 to move toward or away from the molding assembly 50. Of course, the embodiment of the present invention may further include a driving member 60, and the driving member 60 drives the mold plate 11 to move, so that the inner mold 30 is close to or away from the molding assembly 50, thereby implementing the mold pressing of the to-be-molded part in the mold cavity 30 a. Specifically, when the driving member 60 drives the inner mold 30 to approach the molding assembly 50, the molding assembly 50 presses the inner mold 30, so as to press-mold the material to be molded in the inner mold 30; when the driving rod 51 drives the inner mold 30 to be far away from the molding assembly 50, the molding assembly 50 is separated from the inner mold 30, so that the molding of the material to be molded is completed, and the molded product is convenient to take out.

Referring to fig. 1, in an embodiment of the present invention, a surface of the mold plate 11 facing the mold cover 13 is concavely provided with a slot, the slot is disposed around the inner mold 30, a second sealing ring 17 is installed in the slot, and the mold cover 13 is detachably covered on the mold plate 11 through the second sealing ring 17. In the embodiment of the invention, the second sealing ring 17 is arranged in the slot, and the die cover 13 is detachably mounted on the die plate 11 through the second sealing ring 17, so that on one hand, the die cover 13 is detachably connected with the die plate 11 through the insertion of the die cover 13 and the die plate 11, and on the other hand, the arrangement of the second sealing ring 17 ensures the sealing performance of the covering of the die cover 13 and the die plate 11, so that the die cover 13 and the die plate 11 are enclosed to form the closed chamber 10 a.

Referring to fig. 1, in an embodiment of the present invention, the inner mold 30 is formed with a heat flow channel 30b, the heat flow channel 30b is spaced from the mold cavity 30a, the outer mold 10 is mounted with a heat flow pipe 70, the heat flow pipe 70 is communicated with the heat flow channel 30b, and an end of the heat flow pipe 70 facing away from the heat flow channel 30b is disposed outside the outer mold 10. Of course, the end of the heat flow channel 30b away from the heat flow pipe 70 is further communicated with a drain pipe 80, a valve is disposed on the drain pipe 80, and the drain pipe 80 is used for discharging the steam water cooled in the heat flow channel 30 b. When waiting to become the molding material compression molding, close the valve on the discharge tube 80, introduce external hot steam to the hot flow channel 30b through the hot flow tube 70 for the heating forms the inner mold 30 of hot flow channel 30b, thereby make the heat conduction of inner mold 30 to waiting to become the molding material, like this, make and wait to become the molding material compression molding under the condition of heating, guaranteed the product quality after the compression molding. After the molding compound is molded, the drain pipe 80 is opened, and the steam water in the heat flow channel 30b is discharged through the drain pipe 80.

Referring to fig. 1, in one embodiment of the present invention, the heat flow channels 30b are equally spaced from the mold cavity 30 a. It should be noted that, the heat flow channel 30b is equally spaced from the mold cavity 30a, which means that all points on the heat flow channel 30b are equally spaced from the mold cavity. In order to ensure that the material to be molded in the mold cavity 30a is fully and uniformly heated, the invention is provided with the heat flow channel 30b which is arranged at equal interval with the mold cavity 30a, so that the heat steam in the heat flow channel 30b fully and uniformly heats the inner mold 30, thereby realizing the rapid and uniform heating molding of the material to be molded in the mold cavity 30a and improving the molding efficiency of the material to be molded.

Referring to fig. 1, in an embodiment of the present invention, the inner mold 30 includes an upper mold 31 and a lower mold 33 that are disposed opposite to each other, the upper mold 31 and the lower mold 33 sandwich the mold cavity 30a, the upper mold 31 and the lower mold 33 are both provided with the heat flow channel 30b, the outer mold 10 is provided with two heat flow pipes 70, and each heat flow channel 30b is communicated with one heat flow pipe 70. In the embodiment of the invention, the upper die 31 and the lower die 33 are respectively provided with the heat channels, so that the inner die 30 is uniformly heated, the uniformity of heating of the workpiece to be processed in the die cavity 30a is ensured, and the quality of a product after compression molding is improved.

The invention also provides a compression molding method, which comprises the following steps: placing a material to be molded in a mold cavity 30a of the inner mold 30, communicating the air exhaust holes 10b with a vacuumizing device, vacuumizing the mold cavity 30a, and controlling the mold pressing assembly 50 to be close to the mold cavity 30a after the vacuum degree of the mold cavity 30a reaches a preset condition, so that the material to be molded in the mold cavity 30a is molded. According to the technical scheme, after the air exhaust holes 10b are communicated with the vacuumizing equipment, air in the mold cavity 30a flows out of the air exhaust holes 10b after flowing through the closed cavity 10a, so that the mold cavity 30a achieves a vacuum condition, and then the mold pressing assembly 50 is controlled to be close to the inner mold 30, so that the material to be molded in the mold cavity 30a is subjected to mold pressing forming, and the mold pressing forming of the material to be molded under the vacuum condition is achieved. Thus, when the method is applied to the molding of the carbon fiber product, the generation of bubbles on the surface of the carbon fiber product is avoided. Namely, the technical scheme of the invention can realize compression molding under the vacuum condition.

The technical solution of the present invention is further described below with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.

Example 1

A carbon fiber product forming method comprises the following steps:

placing a carbon fiber resin raw material to be molded in a mold cavity of an inner mold, transferring the inner mold to a template, covering a mold cover on the template, communicating a vacuumizing device and an air exhaust hole, vacuumizing the mold cavity, and controlling a mold pressing assembly to move close to the mold cavity after the vacuum degree of the mold cavity reaches a preset condition so as to mold and mold the carbon fiber material in the mold cavity to obtain a carbon fiber product.

In the embodiment of the invention, the carbon fiber resin raw material to be molded is extruded by vacuumizing and then compression molding, so that bubbles generated on the surface of the molded carbon fiber product are avoided, and the quality of the prepared carbon fiber product is improved.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A compression molding die, comprising:

the outer die is internally provided with a closed cavity, and the wall of the closed cavity is provided with an air suction hole communicated with the outside;

the inner die is arranged on the bottom wall of the closed cavity, a die cavity for placing a material to be molded is formed in the inner die, and the die cavity is communicated with the closed cavity;

and the molding assembly is movably arranged on the top wall of the closed cavity to be close to or far away from the mold cavity.

2. A compression molding die as claimed in claim 1, wherein the outer die includes a die plate and a die cover detachably covering the die plate and enclosing the closed cavity, the inner die is disposed on a surface of the die plate facing the closed cavity, and the molding assembly is movably disposed on the die cover.

3. A compression molding die as claimed in claim 2, wherein the molding assembly includes an actuating rod movably inserted through the die cover and a molding plate provided at an end of the actuating rod facing the mold plate.

4. A compression molding die as claimed in claim 3, wherein the die cover has a through hole on a surface thereof facing the die plate, a first sealing ring is installed in the through hole, and the driving rod is movably inserted through the first sealing ring.

5. A compression molding mold as claimed in claim 2, further comprising a driving member disposed on a side of the mold plate facing away from the enclosed chamber and drivingly connected to the mold plate for driving the mold plate toward and away from the molding assembly.

6. A compression molding die as claimed in claim 2, wherein a surface of the die plate facing the die cover is concavely provided with a slot disposed around the inner die, the slot being fitted with a second packing ring, and the die cover is detachably fitted to the die plate via the second packing ring.

7. A compression moulding mould as claimed in any of claims 1 to 6, wherein the inner mould is formed with a heat flow passage spaced from the mould cavity, and the outer mould is fitted with a heat flow duct in communication with the heat flow passage, the end of the heat flow duct facing away from the heat flow passage being located outside the outer mould.

8. A molding die as claimed in claim 7, wherein the heat flow passages are equally spaced from the die cavity.

9. A compression molding die as claimed in claim 7, wherein the inner die includes an upper die and a lower die which are disposed opposite to each other, the upper die and the lower die holding the die cavity, the upper die and the lower die each having the heat flow passage, and the outer die mounting two heat flow pipes, each of the heat flow passages communicating with one of the heat flow pipes.

10. A compression molding method is characterized by comprising the following steps:

and placing the material to be molded in the mold cavity of the inner mold, communicating the air exhaust hole with vacuum-pumping equipment, vacuumizing the mold cavity, and controlling the mold pressing assembly to be close to the mold cavity after the vacuum degree of the mold cavity reaches a preset condition so as to mold the material to be molded in the mold cavity.

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