CN108724705B

CN108724705B - Additive manufacturing device

Info

Publication number: CN108724705B
Application number: CN201810480705.6A
Authority: CN
Inventors: 毕向军; 张辰威; 路建军; 刘秀; 缪伟民
Original assignee: Aerospace Research Institute of Materials and Processing Technology
Current assignee: Aerospace Research Institute of Materials and Processing Technology
Priority date: 2018-05-18
Filing date: 2018-05-18
Publication date: 2020-10-16
Anticipated expiration: 2038-05-18
Also published as: CN108724705A

Abstract

The present invention provides an additive manufacturing apparatus comprising: a movable support; the conveying roller is fixed on the bracket and used for conveying the continuous fiber reinforced thermosetting resin prepreg tape; the cross rod is horizontally arranged on the bracket and is arranged below the conveying roller; the conveying pipe is a pipe with openings at two ends, is fixed on the cross rod and is perpendicular to the cross rod, and a first heat source is arranged in the conveying pipe and is used for simultaneously preheating the prepreg tape passing through the conveying pipe and preheating the pre-paved surface of the prepreg tape to be paved; and a pre-press roll connected to the cross bar and disposed proximate to the opening at the lower end of the delivery tube, which is also pressed against the pre-surfacing and is used to form the pre-heated prepreg tape onto the pre-heated pre-surfacing. The device is applicable to the additive manufacturing of continuous fibers reinforcing thermosetting prepreg, can solve among the prior art and use continuous fibers reinforcing thermosetting prepreg as the restricted technical problem of material increase manufacturing as the raw materials.

Description

Additive manufacturing device

Technical Field

The invention relates to the technical field of composite material manufacturing, in particular to an additive manufacturing device, and particularly relates to a device suitable for additive manufacturing of continuous fiber reinforced resin prepreg.

Background

The additive technology for reinforcing the 3D printing wire by using the continuous fibers is a novel method which is provided for increasing the mechanical strength and the use function of a workpiece on the basis of the original thermoplastic pure resin wire printing technology; the method absorbs the advantages of a common printing technology in the aspects of quick design test, quick forming, simple preparation, low cost, green manufacturing and the like, can also apply the excellent mechanical property, the directional layering design and the like of the continuous fiber to a bearing part or a secondary bearing part, and provides a technical method for the wide application of the additive manufacturing technology in the military and civil fields of aerospace, aviation, ships, weapons and the like.

However, at present, research on the technology focuses on the additive manufacturing method of the continuous fiber reinforced thermoplastic wire and the preparation of the material, so that the prepared composite material product is limited by the inherent melting point, molecular chain length, fiber pre-impregnation capability and the like of the thermoplastic resin, cannot be used at a higher temperature or in a complex environment, and limits the wide-range use of the technology; meanwhile, the continuous fiber reinforced thermoplastic wire needs a molding process technology with high difficulty and a complex process route, so that the price of the wire is increased, and the application of the wire to low-end products is limited.

The continuous fiber reinforced thermosetting prepreg is a main raw material applied to a resin matrix composite structural member at present, but the additive manufacturing of the prepreg is difficult because the thermoplastic resin is composed of linear molecules and has the characteristics of softening by heating and hardening by cooling, and a pre-laid layer and a pre-laid planar molecular chain are mutually entangled at a high temperature to realize interface bonding; the material with higher hardness can be obtained by rapid cooling, and the process characteristics of FDM forming are met; however, the process of forming the molded part with thermosetting resin is different, and complicated physical change and chemical change processes are required, and the following problems exist when the existing additive technology is adopted for manufacturing and molding:

1) the problem of interface strength is that the thermosetting resin is mainly low molecular or small molecular, the adhesion between the bottom layer and the pre-laid layer is determined by the chemical reaction degree of the molecules (i.e. the growth of the molecules), and the bottom surface can not be quickly adhered in a short time; the phenomena of infirm interface bonding, migration of a laying layer, fiber yarn return and the like are caused under the action of dragging of the continuous reinforced fibers, and the application of the thermosetting resin in additive manufacturing is restricted. Meanwhile, in order to ensure sufficient contact and approximate reaction of the molecular functional groups at the layer-to-layer interface, the interface strength under the action of external pressure is required, and a pressurizing device is required to be arranged in the additive manufacturing process, so that the volume change caused by chemical reaction is resisted. The key of restricting additive manufacturing is how to realize the rapid curing and bonding of thermosetting small molecules under a pressurized state;

2) the problem of interface stress is that thermosetting resin is heated on a laying interface to generate chemical-physical reaction, the volume of the material is greatly changed under the action of heat and the influence of molecular chemical reaction, so that larger stress is gathered on the interface, the deformation and warping probability of a workpiece is increased, and the overall strength of the workpiece is reduced. The thermoplastic resin is linear molecules, and is only under the action of thermal stress, so that the interface stress is small.

Disclosure of Invention

The invention provides an additive manufacturing device which is suitable for additive manufacturing of continuous fiber reinforced thermosetting prepreg and can solve the technical problem that additive manufacturing is limited by using the continuous fiber reinforced thermosetting prepreg as a raw material in the prior art.

The technical scheme of the invention is as follows:

the present invention provides an additive manufacturing apparatus comprising: a movable support; the conveying roller is fixed on the bracket and is used for conveying the continuous fiber reinforced thermosetting resin prepreg tape; the cross rod is horizontally arranged on the bracket and is arranged below the conveying roller; the conveying pipe is a pipe with openings at two ends, the conveying pipe is fixed on the cross rod and is perpendicular to the cross rod, a first heat source is arranged in the conveying pipe, and the first heat source is used for simultaneously preheating the continuous fiber reinforced thermosetting resin prepreg tape passing through the conveying pipe and preheating the pre-paved surface of the continuous fiber reinforced thermosetting resin prepreg tape to be paved; the pre-pressing roller is connected with the cross rod and is arranged close to an opening at the lower end of the conveying pipe, the pre-pressing roller is pressed to the pre-paved surface, and the pre-pressing roller is used for forming the preheated continuous fiber reinforced thermosetting resin prepreg tape onto the preheated pre-paved surface; when additive manufacturing is carried out, the support moves according to a path set by a control system and drives other components of the device to move, meanwhile, the continuous fiber reinforced thermosetting resin prepreg tape sequentially passes through the conveying roller and the conveying pipe, is preheated in the conveying pipe and then is conveyed to the pre-pressing roller, is molded on the preheated pre-paved surface through the pre-pressing roller, and is laminated and added and molded through the set path.

Further, the device also comprises a post-treatment roller, the post-treatment roller is connected with the cross rod and pressed towards the pre-paved surface, and the post-treatment roller is used for post-treating the continuous fiber reinforced thermosetting resin prepreg tape formed by the pre-pressing roller.

Further, the pre-pressing roller and the post-processing roller are respectively connected with the cross rod through a first pneumatic connecting rod and a second pneumatic connecting rod, the first pneumatic connecting rod and the second pneumatic connecting rod are further used for adjusting the pressure applied to the pre-paved surface by the pre-pressing roller and the post-processing roller, and the pressure applied to the pre-paved surface by the pre-pressing roller and the post-processing roller is not less than 0.5 Mpa.

Further, the temperature of the pre-press roll is set to be higher than the curing temperature of the thermosetting resin in the continuous fiber reinforced thermosetting resin prepreg tape by 20 ℃ or more; the temperature of the post-treatment roll is set between room temperature and the gel point temperature of the thermosetting resin.

Further, a second heat source is arranged between the pre-pressing roller and the post-processing roller and used for heating the uncured thermosetting resin in the continuous fiber reinforced thermosetting resin prepreg tape to the curing temperature of the uncured thermosetting resin to realize curing.

Further, a part of the pre-pressing roller is covered by the lower end opening of the conveying pipe, and the distance from the bottommost end of the lower end opening of the conveying pipe to the pre-paved surface is not more than 5 mm.

Further, the wrapping length of the continuous fiber reinforced thermosetting resin prepreg tape on the prepressing roll is not less than one fifth of the circumference of the prepressing roll.

Further, the first heat source is for heating the continuous fiber reinforced thermosetting resin prepreg tape and the pre-layup area to a gel point temperature of the thermosetting resin in the continuous fiber reinforced thermosetting resin prepreg tape.

Furthermore, the cross rod is composed of a first flexible cross rod and a second flexible cross rod, the first flexible cross rod and the second flexible cross rod are horizontally connected through a hinge, the post-processing roller is connected with the second flexible cross rod through a second pneumatic connecting rod, the pre-pressing roller is connected with the first flexible cross rod through a first pneumatic connecting rod, and the conveying pipe is fixed at one end of the first flexible cross rod through a bearing capable of freely rotating in a plane.

Further, the conveying roller is a tension roller for conveying the continuous fiber reinforced thermosetting resin prepreg tape while increasing the tension of the continuous fiber reinforced thermosetting resin prepreg tape.

By applying the technical scheme of the invention, the additive manufacturing device is provided, the fiber reinforced thermosetting resin prepreg tape can be applied to the field of additive manufacturing, the problems existing in additive manufacturing by adopting the fiber reinforced thermosetting resin prepreg tape are solved by reasonably arranging a heat source and control pressure among device components and matching among the components, the use range of raw materials for additive manufacturing is expanded, and the limit range of the technology is reduced; the gel content of the product can be reduced, the mechanical property and the temperature resistance grade of the product can be improved, and a technical basis is provided for the preparation of the composite material under severe use conditions.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 shows a schematic structural diagram of an additive manufacturing apparatus according to an embodiment of the present invention;

fig. 2 shows a schematic structural diagram of an additive manufacturing apparatus according to another embodiment of the present invention;

wherein the figures include the following reference numerals:

10. a conveying roller; 20. a cross bar; 30. a delivery pipe; 40. a first heat source; 50. pre-pressing rollers; 60. a post-treatment roll; 70. a second heat source; a connecting rod 80; 21. a first flexible cross-bar; 22. a second flexible cross-bar; 51. a first pneumatic link; 61. a second pneumatic link.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. 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. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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 is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

As shown in fig. 1 and 2, there is provided an additive manufacturing apparatus according to a specific embodiment of the present invention, the apparatus including: a movable support (not shown in the figure), a feed roller 10, a crossbar 20, a feed pipe 30 and a pre-press roller 50; the conveying roller 10 is fixed on the bracket, and the conveying roller 10 is used for conveying a continuous fiber reinforced thermosetting resin prepreg tape (hereinafter referred to as prepreg tape); the cross bar 20 is horizontally arranged on the bracket and is arranged below the conveying roller 10; the conveying pipe 30 is a pipe with openings at two ends, the conveying pipe 30 is fixed on the cross rod 20 and is perpendicular to the cross rod 20, a first heat source 40 is arranged in the conveying pipe 30, and the first heat source 40 is used for simultaneously preheating the prepreg tape passing through the conveying pipe 30 and preheating the pre-paved surface of the prepreg tape to be paved; the pre-press roll 50 is connected to the cross bar 20 and is disposed near an opening of the lower end of the conveying pipe 30, the pre-press roll 50 is further pressed against the pre-paved surface of the pre-paved platform, and the pre-press roll 50 is used for forming the pre-heated prepreg tape on the pre-heated pre-paved surface.

Specifically, when the device is used for additive manufacturing, the bracket moves according to a path set by a control system and drives other components of the device to move, meanwhile, the prepreg tape passes through the conveying roller 10 and the conveying pipe 30 in sequence, is preheated in the conveying pipe 30 and then is conveyed to the prepressing roller 50, is molded on the preheated prepreg pavement through the prepressing roller 50, and is laminated and formed through the set path.

Wherein, the method for manufacturing the additive manufacturing field by setting the path by using a control system such as a computer is a common method for manufacturing the additive manufacturing field, the additive manufacturing means is that materials (the invention refers to prepreg tapes) are automatically accumulated to form a solid structure based on design data, the invention aims to stack the prepreg tapes containing thermosetting resin layer by layer, when preparing a first layer, a bracket driving device component moves according to the set path, the conveying pipe 30 always moves in front of a prepressing roller 50, and aims to preheat the prepreg surface by using a first heat source 40 arranged in the conveying pipe, so that the prepressing roller 50 can ensure that the prepreg tapes are pressed to the preheated prepreg surfaces and are solidified and formed, when preparing a second layer, namely, a second layer is required to be stacked on the first layer, and the bracket driving device component moves according to the set path, at this time, the first heat source 40 preheats the formed first layer, the first layer is equivalent to pre-paving, the prepressing roller 50 presses the prepreg tape onto the preheated first layer, and the prepreg tape is circularly moved back and forth in sequence to stack a plurality of layers of prepreg tapes, so that the additive manufacturing containing the thermosetting resin is realized.

In the present invention, the first heat source 40 is used to heat the prepreg tape and the pre-layup to the gel point temperature of the thermosetting resin in the prepreg tape. By means of the simultaneous preheating mode, on one hand, the thermosetting resin can be rapidly polymerized at high temperature, and the presoaked prepreg tape and the presoaked surface can be preheated, pressed and spread (better combination between layers is ensured) and cured at high temperature in a short time, so that the phenomenon of heat aggregation is avoided, and unnecessary reaction is also avoided; on the other hand, as the additive manufacturing is that a bundle of fibers are solidified and laid in a small range, the pre-laid area is small, such as a small pool which is melted by heating, at the moment, the pre-laid image of the invention can be regarded as a small 'solidified molten pool', and the preheated pre-impregnated tape is solidified and formed in the molten pool, so that the temperature difference between the pre-impregnated tape and the small 'solidified molten pool' is reduced, the surface of the pre-impregnated tape is expanded by heating and is close to the expansion coefficient of the solidified single-layer pre-impregnated tape, the phenomenon that the thermal stress is generated on the interface due to the shrinkage of the 'hot' pre-impregnated tape after being laid on the 'cold' pre-laid surface is avoided, and the problem of interlayer stress caused by.

Further, as an embodiment of the present invention, the first heat source 40 may be a light source or other heat source capable of heating, and the light source may be disposed on the upper end and the sidewall of the conveying pipe 30.

As an embodiment of the present invention, the apparatus further includes a post-treatment roller 60, the post-treatment roller 60 is connected to the cross bar 20 and presses the pre-paved surface, and the post-treatment roller 60 is used for post-treating the prepreg tape formed by the pre-pressing roller 50. The post-processing roller 60 in the invention has two functions, on one hand, the post-processing roller 60 presses the pre-paving to further apply pressure to the pre-impregnated tape which is already laid, so that the phenomenon of silk returning of the pre-impregnated tape which is already laid is prevented; on the other hand, because the curing temperature of the thermosetting resin in the pre-laid prepreg tape is high, the post-treatment roller 60 is designed as a low-temperature roller for heat dissipation of the already laid prepreg tape in order to further avoid heat accumulation.

Preferably, the temperature of the post-treatment roll 60 is set between room temperature and the gel point temperature of the thermosetting resin, more preferably room temperature. Therefore, a series of actions such as preheating, pressurizing and spreading, high-temperature curing, rapid heat dissipation and the like are carried out on the prepreg tape and the 'curing molten pool' in a short time, the phenomenon of heat accumulation does not exist, and unnecessary reaction is avoided; meanwhile, the thin solidified layer is quickly cooled to low temperature through the low-temperature treatment of the post-treatment roller 60, the solidified state is maintained, and the deformation is effectively prevented.

In the invention, in order to realize that the pre-pressing roller 50 and the post-processing roller 60 apply pressure to the pre-paved surface, the pre-pressing roller 50 and the post-processing roller 60 are respectively connected with the cross bar 20 through a first pneumatic connecting rod 51 and a second pneumatic connecting rod 61, and the pressure applied to the pre-paved surface by the pre-pressing roller 50 and the post-processing roller 60 is adjusted through the first pneumatic connecting rod 51 and the second pneumatic connecting rod 61;

preferably, in order to achieve better bonding between the layers of the prepreg tape, the pre-press roll 50 and the post-treatment roll 60 apply a pressure of not less than 0.5Mpa to the pre-paved surface.

As a specific embodiment of the present invention, as shown in fig. 1 and 2, in order to ensure the relative stability between the pre-press roll 50 and the post-treatment roll 60, the pre-press roll 50 and the post-treatment roll 60 are configured as rolls having the same size, the diameters of the pre-press roll 50 and the post-treatment roll 60 are 10mm to 60mm, the roll centers of the pre-press roll and the post-treatment roll are located on the same horizontal line, and the roll centers of the pre-press roll and the post-treatment roll are horizontally connected through a connecting rod 80.

In one embodiment of the present invention, the prepressing roller 50 is a heating roller whose temperature is set to be 20 ℃ or higher than the curing temperature of the thermosetting resin in the continuous fiber reinforced thermosetting resin prepreg tape in order to realize high-temperature curing molding of the prepreg tape.

As a specific embodiment of the present invention, as shown in fig. 2, in order to ensure that the laid prepreg tape is completely cured, a second heat source 70 is further provided between the pre-press roll 50 and the post-treatment roll 60, the second heat source 70 is used for heating the uncured thermosetting resin in the continuous fiber reinforced thermosetting resin prepreg tape to the curing temperature thereof to achieve curing, and specifically, in order to provide the second heat source 70, as shown in fig. 2, a tube perpendicular to the opening of the cross bar 20 may be provided on the cross bar 20 between the pre-press roll 50 and the post-treatment roll 60, the second heat source 70 may be provided on the side wall of the tube or on the cross bar 20 and provide a heat source through the tube, and thus, the centralized supply of the heat source may be ensured without affecting the temperature of other components.

As a specific embodiment of the present invention, a part of the pre-press roll 50 is covered by the lower end opening of the conveying pipe 30, and the distance from the bottom end of the lower end opening of the conveying pipe 30 to the pre-paved surface is not more than 5 mm; in order to realize such an arrangement, as shown in fig. 1-2, the lower end opening of the conveying pipe 30 is provided with a slant opening, and in order to ensure smooth passing of the prepreg tape and sufficient preheating, the conveying pipe 30 has a diameter of not less than 10mm and a length of 20cm to 100 cm.

Further, in the present invention, in order to realize better laying of the prepreg tape, the wrapping length of the prepreg tape on the prepressing roll 50 is not less than one fifth of the circumference of the prepressing roll 50.

As an embodiment of the present invention, as shown in fig. 1-2, the cross bar 20 is composed of a first flexible cross bar 21 and a second flexible cross bar 22, the first flexible cross bar 21 and the second flexible cross bar 22 are horizontally connected by a hinge, the post-processing roller 60 is connected to the second flexible cross bar 22 by a second pneumatic connecting rod, the pre-pressing roller 50 is connected to the first flexible cross bar 21 by a first pneumatic connecting rod, and the conveying pipe 30 is fixed to one end of the first flexible cross bar 21 by a bearing that freely rotates in a plane. By the configuration, the cross bar 20 is provided with the first flexible cross bar 21 and the second cross bar 22 which are connected by the hinge, the prepressing roller 50 is connected with the first flexible cross bar 21, and the post-processing roller 60 is connected with the second flexible cross bar 22, and the relative positions of the prepressing roller 50 and the post-processing roller 60 can be conveniently adjusted at the turning angle due to the reciprocating movement of the set path during the ply manufacturing; the horizontal rod 20 is automatically adjusted to move when the rotation direction is ensured by using a bearing which rotates freely and is connected with the conveying pipe 30.

Further, as an embodiment of the present invention, the conveying roller 10 is further provided as a tension roller for increasing the tension of the continuous fiber reinforced thermosetting resin prepreg tape while conveying the continuous fiber reinforced thermosetting resin prepreg tape. Through the configuration mode, the conveying roller 10 is configured to be a tension roller, so that the conveying of the prepreg tape is ensured, and the friction force of the tension roller is utilized to increase the tension of the prepreg tape, thereby being beneficial to flattening of the prepreg tape.

Preferably, the diameter of the tension roller is 10 mm-50 mm

Further, in the present invention, the developed width of the prepreg tape cannot exceed the widths of the tension roller, the pre-press roller 50 and the post-processing roller 60.

The invention designs a preparation device for online laying and fast curing of a prepreg tape, which is characterized in that a prepressing roller 50 is used for pressing to unfold and lay the prepreg tape, and then the resin is fast cured and molded in a short time by using the fast temperature rise of a high-temperature heat source (two times of preheating and the temperature design of the prepressing roller); the post-treatment roller 60 is then used to lower the temperature of the cured layer. The whole process realizes the rapid manufacture of the continuous fiber reinforced thermosetting composite material by using the additive manufacturing technology based on the thermosetting resin heated and cured, and provides a new way for the low-cost manufacturing technology of high-performance composite material products.

The invention has the following characteristics:

1) the invention utilizes the characteristic that thermosetting resin is heated and rapidly polymerized to rapidly react and bond on the pre-paved surface in a narrow 'curing molten pool', abandons the possibility that the conventional composite material is subjected to high-temperature 'implosion' to cause fire, and shortens the time for curing the paved layer;

2) the invention adopts a preheating method to respectively preheat the prepreg tape and the pre-paved surface to a set temperature, thereby reducing the bonding surface stress caused by the temperature difference of the materials and improving the mechanical property between layers;

3) the invention uses pressure to press and form, thus improving the interlayer performance of additive manufacturing;

4) the invention adopts a high-pressure cooling mode, namely, a low-temperature post-processing roller with pressure is used for cooling a solidified layer under the solidification pressure, so that the stress is released to a certain extent, and the possibility of stress deformation of a workpiece is reduced;

5) the invention adopts a flexible connecting mechanism, fixes the relative positions of all parts, freely rotates and conforms to the rapid running track.

The effect of additive manufacturing using the apparatus of the present invention is illustrated in two specific examples below:

example 1

The product was prepared using a 12K carbon fiber reinforced medium temperature epoxy resin prepreg tape.

This example employed an additive manufacturing apparatus as shown in fig. 1, in which the temperature parameters were set such that the temperature in the conveying pipe was set to 100 ℃, the pre-press roll temperature was 160 ℃, and the post-process roll temperature was 90 ℃.

After the device is used, the time for preparing the die and preparing the conventional molding is saved from the design directly to the production test, about one half of the original time is used, and the cost is about one fifth of the original cost. The properties of the manufactured article are better than in conventional processes.

Example 2

In this example, the additive manufacturing apparatus shown in fig. 2 was used, and the temperature parameters were set such that the temperature in the conveying pipe was 100 ℃, the pre-press roll temperature was 180 ℃, the second heat source temperature was 180 ℃, and the post-treatment roll temperature was 80 ℃.

After the device is used, the time for preparing the die and preparing the conventional molding is saved from the design directly to the production test, about one third of the time is used, and the cost is about one fourth of the cost. The properties of the manufactured article are better than in conventional processes.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An additive manufacturing apparatus, the apparatus comprising: a movable support; the conveying roller (10) is fixed on the bracket, and the conveying roller (10) is used for conveying the continuous fiber reinforced thermosetting resin prepreg tape; the cross bar (20), the said cross bar (20) is set up on the said support horizontally and placed below the said feed roller (10); the conveying pipe (30) is a pipe with openings at two ends, the conveying pipe (30) is fixed on the cross rod (20) and is perpendicular to the cross rod (20), a first heat source (40) is arranged in the conveying pipe (30), and the first heat source (40) is used for preheating the continuous fiber reinforced thermosetting resin prepreg tape passing through the conveying pipe (30) and preheating a pre-paved surface to be paved of the continuous fiber reinforced thermosetting resin prepreg tape; a pre-press roll (50), the pre-press roll (50) is connected with the cross rod (20) and is arranged close to the opening of the lower end of the conveying pipe (30), the pre-press roll (50) is pressed to the pre-paved surface, and the pre-press roll (50) is used for forming the preheated continuous fiber reinforced thermosetting resin prepreg tape on the preheated pre-paved surface; when additive manufacturing is carried out, the bracket moves according to a path set by a control system and drives other components of the device to move, meanwhile, the continuous fiber reinforced thermosetting resin prepreg tape sequentially passes through the conveying roller (10) and the conveying pipe (30), is preheated in the conveying pipe (30) and then is conveyed to the prepressing roller (50), is molded on the preheated prepped surface through the prepressing roller (50), and the preheated continuous fiber reinforced thermosetting resin prepreg tape is laminated and molded through the set path.

2. An additive manufacturing apparatus according to claim 1, further comprising a post-treatment roll (60), the post-treatment roll (60) being connected to the cross bar (20) and pressing against the pre-surfacing, the post-treatment roll (60) being adapted to post-treat the continuous fibre reinforced thermosetting resin pre-preg formed by the pre-press roll (50).

3. An additive manufacturing device according to claim 2, wherein the pre-pressing roll (50) and the post-processing roll (60) are connected to the cross bar (20) by a first pneumatic connecting rod (51) and a second pneumatic connecting rod (61), respectively, the first pneumatic connecting rod (51) and the second pneumatic connecting rod (61) are further used for adjusting the pressure applied by the pre-pressing roll (50) and the post-processing roll (60) to the pre-paved surface, and the pressure applied by the pre-pressing roll (50) and the post-processing roll (60) to the pre-paved surface is not less than 0.5 MPa.

4. An additive manufacturing apparatus according to claim 2, wherein the temperature of the pre-press roll (50) is set to be 20 ℃ or higher than the curing temperature of the thermosetting resin in the continuous fiber-reinforced thermosetting resin prepreg tape; the temperature of the post-treatment roll (60) is set between room temperature and the gel point temperature of the thermosetting resin.

5. An additive manufacturing device according to claim 4, wherein a second heat source (70) is further provided between the pre-press roll (50) and the post-treatment roll (60), the second heat source (70) being adapted to heat uncured thermosetting resin in the continuous fibre reinforced thermosetting resin prepreg tape to its curing temperature to effect curing.

6. An additive manufacturing device according to claim 1, wherein a part of the pre-press roll (50) is covered by the lower end opening of the conveying pipe (30), and the lowermost end of the lower end opening of the conveying pipe (30) is not more than 5mm from the pre-paved surface.

7. An additive manufacturing device according to claim 6, wherein the wrapping length of the continuous fiber reinforced thermosetting resin prepreg tape over the pre-press roll (50) is not less than one fifth of the circumference of the pre-press roll (50).

8. An additive manufacturing apparatus according to claim 1, wherein the first heat source (40) is adapted to heat the continuous fibre reinforced thermosetting resin prepreg tape and the pre-layup to a gel point temperature of the thermosetting resin in the continuous fibre reinforced thermosetting resin prepreg tape.

9. An additive manufacturing device according to any one of claims 3-8, wherein the cross bar (20) is composed of a first flexible cross bar (21) and a second flexible cross bar (22), the first flexible cross bar (21) and the second flexible cross bar (22) are horizontally connected by a hinge, the post-processing roller (60) is connected with the second flexible cross bar (22) by a second pneumatic connecting rod (61), the pre-pressing roller (50) is connected with the first flexible cross bar (21) by a first pneumatic connecting rod (51), and the conveying pipe (30) is fixed at one end of the first flexible cross bar (21) by a bearing which can freely rotate in a plane.

10. An additive manufacturing apparatus according to claim 1, wherein the conveyor roller (10) is a tension roller for conveying the continuous fibre reinforced thermosetting resin prepreg tape while also increasing the tension of the continuous fibre reinforced thermosetting resin prepreg tape.