TWI772187B - Forming method for thermoplastic composite frame and frame tube - Google Patents

Abstract

A method for forming a thermoplastic composite frame, comprising: (A) heating a thermoplastic fiber prepreg sheet. (B) Winding the thermoplastic fiber prepreg sheet on a work surface using a mandrel unit. (C) Repeat the step (A) and the step (B), so that a plurality of the thermoplastic fiber prepreg sheets are wound and stacked on the core mold unit to form an upper tube blank, a lower tube blank, One riser tube embryo, two rear fork tube embryos, and two rear fork tube embryos. (D) hot pressing the upper tube blank, the lower tube blank, the riser tube blank, the seat stay tube blanks and the lower stay tube blanks together with the mandrel unit to form an upper tube blank respectively Pipe fittings, lower pipe fittings, first riser pipe fittings, second seat stay pipe fittings and second chain stay pipe fittings. (E) Open the mold and take out the upper tube, the lower tube, the riser, the seat fork tubes, the rear fork tubes and the core mold unit. (F) Pulling the mandrel unit out of the upper tube, the lower tube, the riser, the seat stay tubes and the chain stay tubes. (G) Connecting a head tube with the upper tube and the lower tube, a connector with the upper tube, the riser and the rear seat fork tubes, and a bottom bracket with the lower tube; The pipe, the riser and the chainstay pipes are connected together, and each of the two rear wheel dropout pieces is connected to the corresponding one of the seatstay pipes and the corresponding one of the chainstays, to form a frame.

Description

Forming method of thermoplastic composite frame and frame tube

The present invention relates to a vehicle frame, in particular to a thermoplastic composite material vehicle frame and a method for forming the frame pipe fittings.

Today's carbon fiber bicycle frames are mostly made of thermosetting carbon fiber composite materials. However, after the thermosetting carbon fiber composite material is heated and cured, it cannot be heated and softened again. The rack can not be recycled, which will cause environmental protection problems of recycling.

In order to improve the above problems, some manufacturers have developed a bicycle thermoplastic composite frame member (Taiwan Model Patent No. M576098), and its molding method includes the following steps:

1. Shell forming step: As shown in Figures 1 and 2, the pre-formed frame member 2 (see Figure 5) is split into two shells 2I and 2II that can be combined with each other in a left and right half way. A shell 2I, 2II has at least two butt side edges 201 for butting together. In this step, a thermoplastic composite plate 1 made of thermoplastic carbon fiber material or thermoplastic glass fiber material is selected, and a mold is used By means of hot-press forming, the thermoplastic composite plate 1 is hot-pressed to form the shell parts 2I and 2II.

2. Steps of butt joint assembly of shell parts: As shown in Figures 2 and 3, the shell parts 2I, 2II are butt-jointed, so that the butt side edges 201 of the shell parts 2I, 2II corresponding to each other are overlapped and overlapped. When the pieces 2I, 2II are butt-jointed, an inner support 3 is arranged inside the shell pieces 2I, 2II.

3. Mold hot pressing step: as shown in Figures 3 and 4, in the way of mold hot pressing, with the support or pressure of the inner support 3, the shell parts 2I and 2II are butted against each other. The overlapping areas of the side edges 201 are thermo-compressed and welded to form an integral body, so that the shell parts 2I and 2II are joined together to form the frame member 2 . During this process, the shell parts 2I and 2II are butted against each other at the side edges 201 . It will become a welding protrusion 202 in a thickened form.

4. Steps of removing the inner support: As shown in FIG. 4 and FIG. 5 , remove the inner support 3 located inside the frame member 2 .

Although the vehicle frame member 2 made of thermoplastic composite material can be formed by the above-mentioned molding method, in the process of thermocompression welding of the butt side edges 201 of the shell members 2I and 2II abutting against each other, only the In the future, when the frame member 2 is subjected to external force, stress concentration will often occur in this place, resulting in structural damage, and when the frame member 2 is subjected to external force When the number of pairs of the butt side edges 201 of the shell members 2I and 2II to be butted against each other is larger, the above-mentioned problem of stress concentration is more likely to occur.

Accordingly, it is an object of the present invention to provide a method for forming a thermoplastic composite frame and frame tube that overcomes at least one of the disadvantages of the prior art.

Thus, the thermoplastic composite frame and the method for forming the frame tube of the present invention comprise:

(A) Heating a thermoplastic fiber prepreg.

(B) Winding the thermoplastic fiber prepreg sheet on a work surface using a mandrel unit.

(C) Repeat the step (A) and the step (B), so that a plurality of the thermoplastic fiber prepreg sheets are wound and stacked on the core mold unit, and the latter piece of the thermoplastic fiber prepreg The head end of the dipping sheet is staggered in the circumferential direction with the tail end of the previous thermoplastic fiber prepreg sheet to form an upper tube blank, a lower tube blank, a vertical tube blank, and two rear upper fork tube blanks. , and the second rear fork tube embryo.

(D) heat pressing the upper tube blank, the lower tube blank, the riser tube blank, the rear seat blanks and the lower fork blanks together with the mandrel unit, so that the upper tube blank, The lower tube blank, the riser tube blank, the rear seat fork tube blanks and the rear lower fork tube blanks are respectively formed into an upper tube, a lower tube, a riser, two rear fork tubes and two rear fork tubes .

(E) Open the mold and take out the upper tube, the lower tube, the riser, the seat fork tubes, the rear fork tubes and the core mold unit.

(F) Pulling the mandrel unit out of the upper tube, the lower tube, the riser, the seat stay tubes and the chain stay tubes.

(G) Connecting a head tube with the upper tube and the lower tube, a connector with the upper tube, the riser and the rear seat fork tubes, and a bottom bracket with the lower tube; The pipe, the riser and the chainstay pipes are connected together, and each of the two rear wheel dropout pieces is connected to the corresponding one of the seatstay pipes and the corresponding one of the chainstays, to form a frame.

The effect of the present invention is as follows: the present invention utilizes that a plurality of the thermoplastic fiber prepreg sheets are wound and stacked on the core mold unit, and the head end of the latter thermoplastic fiber prepreg sheet is aligned with the front end of the thermoplastic fiber prepreg sheet. The design of the staggered end of the thermoplastic fiber prepreg sheet in the circumferential direction can effectively prevent the upper pipe fitting, the lower pipe fitting, the vertical pipe fitting, the rear seat fork fittings and the rear The lower fork tube is thickened at a specific place to form a stress concentration point. In this way, when the frame is subjected to external force during the ride of the user, the upper tube, the lower tube, the riser, the The seat fork pipe fittings and the chain stay pipe fittings are not prone to the problem of structural damage due to stress concentration.

Referring to FIG. 6, it is an embodiment of the molding method of the thermoplastic composite frame 100 of the present invention, which includes the following steps:

Step 810 (see FIG. 6 ): As shown in FIG. 7 , heating a thermoplastic fiber prepreg sheet 400 , the thermoplastic fiber prepreg sheet 400 has a head end 410 and a tail end 420 .

In this embodiment, a workbench 200 is prepared, and a release paper 300 is placed on the top surface of the workbench 200. The release paper 300 has a work surface 310, and the thermoplastic fiber prepreg sheet 400 is prepared. Placed on the working surface 310, the working platform 200 is a heating platform, and the thermoplastic fiber prepreg sheet 400 is heated by the working platform 200 through the release paper 300, and the thermoplastic fiber prepreg sheet is heated The temperature of 400 ranges from 70°C to 200°C to soften the thermoplastic fiber prepreg sheet 400. Preferably, the temperature for heating the thermoplastic fiber prepreg sheet 400 ranges from 90°C to 150°C.

In this embodiment, the thermoplastic fiber prepreg sheet 400 is made of unidirectional carbon fiber filaments impregnated with thermoplastic resin, and the weight percentage of the unidirectional carbon fiber filaments ranges from 40% to 70%. The weight percentage of resin is between 30% and 60%, but not limited to this. The material of the thermoplastic fiber prepreg sheet 400 can also be changed to a carbon fiber woven cloth impregnated with thermoplastic resin. The weight percentage of the thermoplastic resin is between 40% and 70%, and the weight percentage of the thermoplastic resin is between 30% and 60%.

It should be noted that, in other variations of this embodiment, the worktable 200 can also be changed to use a general platform, and be equipped with a heating lamp source (not shown), so as to use the heating lamp source to irradiate the thermoplastic The thermoplastic fiber prepreg sheet 400 is heated to heat the thermoplastic fiber prepreg sheet 400 .

Step 820 (see FIG. 6 ): as shown in FIGS. 7 , 8 and 9 , use a core mold unit 500 to wind the thermoplastic fiber prepreg sheet 400 on the working surface 310 . In this embodiment, the The core mold unit 500 includes one core mold 510, one core mold 520, one core mold 530, two core molds 540, and two core molds 550, and can manually or mechanically make each core mold 510, 520, 530, The thermoplastic fiber prepreg sheet 400 is wound on the working surface 310 540 , 550 .

Step 830 (see FIG. 6 ): as shown in FIGS. 7 , 8 and 9 , repeat the step 810 and the step 820 , so that the plurality of thermoplastic fiber prepreg sheets 400 are sequentially wound and stacked on the core mold. On each mandrel 510, 520, 530, 540, 550 of the unit 500, and, on each mandrel 510, 520, 530, 540, 550 and the latter one of the thermoplastic fiber prepreg sheet 400 The head end 410 and the tail end 420 of the previous thermoplastic fiber prepreg sheet 400 are staggered in the circumferential direction to form a set of upper tube blanks 10 placed on the core mold 510 and a set of upper tube blanks 10 placed on the core mold 510. The lower tube blanks 20 of the mold 520, a set of vertical tube blanks 30 placed on the core molds 530, two upper fork tube blanks 40 placed on the core molds 540, respectively, and two set of the vertical tube blanks on the core molds 540, respectively 550 chainstay tube stock 50.

Step 840 (see FIG. 6 ): As shown in FIGS. 10 and 11 , the upper tube preform 10 , the lower tube preform 20 , the riser tube preform 30 , the rear seat preforms 40 and the rear leg preforms 40 are formed. The blank 50 together with the core molds 510, 520, 530, 540, and 550 of the core mold unit 500 are pressed into the mold to make the upper tube blank 10, the lower tube blank 20, the riser tube blank 30, and the seat fork tubes. The blank 40 and the chain stay tube blanks 50 are respectively formed into an upper pipe part 10 ′, a lower pipe part 20 ′, a riser pipe part 30 ′, two seat stay pipe parts 40 ′ and two chain stay pipe parts 50 ′. In this embodiment, the upper tube blank 10 , the lower tube blank 20 , the riser tube blank 30 , the bottom fork tube blanks 40 and the bottom fork tube blanks 50 together with the core mold unit 500 are The core molds 510, 520, 530, 540, 550 are placed in different mold cavities of a mold 600 for hot pressing. It can be understood that in other variations of this embodiment, the upper tube blank 10, the The lower tube blanks 20 , the riser tube blanks 30 , the seat stay tube blanks 40 and the seat stay tube blanks 50 together with the core molds 510 , 520 , 530 , 540 , and 550 of the core mold unit 500 are respectively placed in five A special mold (not shown) for hot pressing.

In this embodiment, the temperature of the hot-pressing mold is between 130°C and 320°C, so that the upper tube blank 10 , the lower tube blank 20 , the riser tube blank 30 , the upper fork blanks 40 and the Wait until the thermoplastic resin in the material of the bottom fork tube 50 is melted.

Step 850 (see FIG. 6 ): as shown in FIGS. 11 and 12 , the mold 600 is opened to take out the upper pipe piece 10 ′, the lower pipe piece 20 ′, the riser pipe piece 30 ′, and the rear seat fork pipe pieces 40 ' and the chainstays 50 ' together with the mandrels 510 , 520 , 530 , 540 , 550 of the mandrel unit 500 .

Step 860 (see FIG. 6 ): As shown in FIGS. 12 and 13 , the core molds 510 , 520 , 530 , 540 , and 550 of the core mold unit 500 are respectively removed from the upper pipe fitting 10 ′, the lower pipe fitting 20 ′, the vertical pipe The tube 30', the seat stay tubes 40' and the chain stay tubes 50' are pulled out.

Step 870 (see FIG. 6 ): As shown in FIGS. 13 , 14 and 15 , connect a head tube 60 with the upper tube 10 ′ and the lower tube 20 ′, and connect a connector 70 with the upper tube 10 ′ , the riser 30' and the seat stay tubes 40' are connected together, and a bottom bracket 80 is connected with the lower tube 20', the riser 30' and the rear fork tubes 50', Each of the two rear dropout members 90 is connected to a corresponding one of the seat stay tube members 40 ′ and a corresponding one of the seat stay tube members 50 ′ to form a frame 100 .

In this embodiment, as shown in FIGS. 15 and 16 , glue 94 is used to bond the head tube 60 to the upper tube 10 ′ and the lower tube 20 ′, and glue 94 is used to bond the connector 70 to the upper tube 10'. Adhere the riser 30' and the seat stay tubes 40', and use glue 94 to bond the bottom bracket 80 to the lower tube 20', the riser 30' and the rear fork tubes 50' Adhesion, using glue 94 to glue each rear wheel dropout member 90 to the corresponding one of the seat stay tubes 40 ′ and the corresponding one of the chainstay tubes 50 ′.

As shown in FIGS. 13 , 14 and 15 , the head pipe member 60 has a head pipe portion 61 , an upper pipe front connecting portion 62 connected to the head pipe portion 61 and extending backward, and a head pipe portion 61 connected to and extending backward. The front connecting part 63 of the lower pipe extending backward, the connecting piece 70 has an upper connecting part 71 of the riser, a rear connecting part 72 of the upper pipe which is connected to the upper connecting part 71 of the riser and extends forward; The upper connecting part 71 of the seat pipe is connected to the front connecting part 73 of the seat fork and extends backward. The bottom bracket 80 has a crank pipe part 81 and a rear connecting part of the lower pipe connected to the crank pipe part 81 and extending forward. 82. A lower riser connecting portion 83 connected with the crank tube portion 81 and extending upward, and a chainstay front connecting portion 84 connected with the crank tube portion 81 and extending backwards, the chain stay front connecting portion 84 The portion 84 has two connecting pipe sections 841 , and each rear wheel dropout member 90 has a hook portion 91 , a seat stay rear connecting portion 92 connected with the hook portion 91 , and a chain stay connected with the hook portion 91 . Rear connection part 93 .

The upper tube 10' is connected between the upper tube front connecting portion 62 and the upper tube rear connecting portion 72, the lower tube 20' is connected between the lower tube front connecting portion 63 and the lower tube rear connecting portion 82, The seat pipe member 30 ′ is connected between the seat pipe upper connecting portion 71 and the seat pipe lower connecting portion 83 , the front ends of the seat stay pipe members 40 ′ are connected with the seat stay front connecting portion 73 , the rear lower The front end of the fork pipe member 50' is connected with the connecting pipe section 841 of the front connecting portion 84 of the seat stay, and the rear seat fork connecting portion 92 of each rear wheel dropout member 90 is connected to the corresponding one of the seat fork pipe members 40'. The rear end is connected, and the chainstay rear connecting portion 93 of each rear wheel dropout member 90 is connected with the rear end of the corresponding one of the chainstay pipe members 50 ′.

In this embodiment, the head tube 60 , the connecting member 70 , the bottom bracket 80 and the rear wheel dropout members 90 can be formed by long fiber injection molding, or by metal processing.

Step 880 (see FIG. 6 ): As shown in FIG. 17 , place the frame 100 into an oven 700 for heating to cure the glue 94 (see FIG. 16 ). In this embodiment, the heating temperature of the oven 700 is between At 30℃～90℃.

In this way, as shown in FIG. 17 , the manufacture of the vehicle frame 100 can be completed.

Through the above description, the advantages of the present invention can be summarized as follows:

1. Compared with the prior art, the present invention utilizes “winding and stacking a plurality of the thermoplastic fiber prepreg sheets 400 on each core mold 510, 520, 530, 540, 550 of the core mold unit 500. , and the design of staggering the head end 410 of the thermoplastic fiber prepreg sheet 400 of the latter piece and the tail end 420 of the thermoplastic fiber prepreg sheet 400 of the previous piece in the circumferential direction can effectively avoid The formed upper tube 10', the lower tube 20', the riser 30', the rear seat fork tubes 40' and the rear seat fork tubes 50' form stress due to the increased thickness in certain places Focusing on the point, when the frame 100 is subjected to an external force during the riding process of the user, the upper tube 10 ′, the lower tube 20 ′, the seat tube 30 ′, the seat fork tube 40 ′ and the The chainstays 50' are less likely to be structurally damaged due to stress concentration.

2. Compared with the prior art, the present invention does not need to perform the step of connecting and assembling the shell parts of the prior art, which can simplify the forming step of the frame tube.

It can be understood that, as long as the above-mentioned steps 870 and 880 are omitted, the present invention can use the above-mentioned steps 810-860 to form a pipe fitting for the vehicle frame 100 .

To sum up, the thermoplastic composite frame and the method for forming the frame tube of the present invention can not only avoid the structural damage of the frame tube due to stress concentration, but also simplify the forming steps of the frame tube, so it can indeed achieve object of the present invention.

However, the above are only examples of the present invention, and should not limit the scope of the present invention. Any simple equivalent changes and modifications made according to the scope of the application for patent of the present invention and the content of the patent specification are still within the scope of the present invention. within the scope of the invention patent.

100: Frame

10: Upper tube embryo

10': upper pipe fittings

20: Down tube embryo

20': lower pipe

30: Riser tube embryo

30': Riser Fittings

40: After the fork tube embryo

40': seat stay tube

50: Rear fork tube embryo

50': Chainstay tube

60: Head Fittings

61: Head tube

62: Front connection part of the upper tube

63: Down tube front connector

70: Connector

71: Connecting part on the riser

72: Rear connection part of the upper tube

73: Front connecting part of seat fork

80: Five-way pipe fittings

81: Crank tube

82: Rear connection part of down tube

83: lower connection part of riser

84: Front link of chainstay

841: Connecting Pipe Sections

90: Rear wheel dropout

91: Hook

92: rear connecting part of seat fork

93: Chainstay rear connecting part

94: glue

200: Workbench

300: release paper

310: Work Surface

400: Thermoplastic fiber prepreg sheet

410: Head end

420: tail

500: Core mold unit

510: Mandrel

520: Mandrel

530: Mandrel

540: Mandrel

550: Mandrel

600: Mould

700: Oven

810: Steps

820: Steps

830: Steps

840: Steps

850: Steps

860: Steps

870: Steps

880: Steps

1: Thermoplastic composite sheet

2: Frame components

2Ⅰ: Shell

2Ⅱ: Shell

201: Butt side edge

202: Welding convex body

3: inner support

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: 1 is a perspective view illustrating that a thermoplastic composite sheet is hot-pressed into a shell by a conventional method for forming a thermoplastic composite frame member of a bicycle; 2 is an exploded perspective view illustrating two shell members and an inner support member produced by a conventional molding method for a thermoplastic composite frame member of a bicycle; 3 is an assembled cross-sectional view illustrating a conventional method for forming a thermoplastic composite frame member of a bicycle to match two shell members with the inner support member; FIG. 4 is a view similar to FIG. 3 , illustrating the thermocompression bonding of two shell members into a frame member by a conventional molding method of a thermoplastic composite frame member of a bicycle; Fig. 5 is a perspective view of the frame member; 6 is a flow chart of an embodiment of a method for forming a thermoplastic composite frame of the present invention; 7 is a perspective view illustrating a worktable, a release paper, and a core mold unit used in this embodiment, and this embodiment utilizes the worktable to heat a thermoplastic fiber prepreg sheet through the release paper; FIG. 8 is an incomplete cross-sectional view illustrating that in this embodiment, the plurality of thermoplastic fiber prepreg sheets are repeatedly wound on the release paper by using the core mold unit, so that the plurality of thermoplastic fiber prepreg sheets are formed. winding and stacking on the mandrel unit; 9 is a perspective view illustrating that in this embodiment, a plurality of the thermoplastic fiber prepreg sheets are respectively wound on the core molds of the core mold unit to form an upper tube blank, a lower tube blank, and a vertical tube blank , the second upper fork tube embryo, and the second rear fork tube embryo; 10 is a schematic plan view illustrating that the upper tube blank, the lower tube blank, the riser tube blank, the seat stay tube blanks and the lower stay tube blanks together with the core mold unit are injected into the mold and heated in this embodiment pressure; FIG. 11 is a view similar to FIG. 10 , illustrating that the upper tube preform, the lower tube preform, the riser tube preform, the rear seat preforms, and the rear leg preforms are heat-pressed separately in this embodiment. It is formed into an upper pipe fitting, a lower pipe fitting, a vertical pipe fitting, a second rear upper fork pipe fitting and a second rear lower fork pipe fitting; FIG. 12 is a view similar to FIG. 9 , illustrating that the upper tube, the lower tube, the riser, the seat stay tubes and the chain stay tubes are taken out by mold opening in this embodiment; Figure 13 shows the upper pipe fitting, the lower pipe fitting, the riser pipe fitting, the seat stay pipe fittings, the rear fork fittings, and a head pipe fitting, a connecting piece, a five-way pipe fitting and two rear wheels used in this embodiment The exploded perspective view of the hook piece; Figure 14 is a view similar to Figure 13, but viewed from a different angle; Figure 15 is a perspective view illustrating a frame formed by this embodiment; Figure 16 is a partial assembled cross-sectional view of the frame; and Figure 17 is a schematic plan view illustrating the frame being heated in an oven.

810: Steps

820: Steps

830: Steps

840: Steps

850: Steps

860: Steps

870: Steps

880: Steps

Claims (10)

A method for forming a thermoplastic composite frame, comprising: (A) preparing a workbench, and a release paper placed on the top surface of the workbench, the release paper having a work surface, and a thermoplastic fiber The prepreg sheet is placed on the working surface, and the thermoplastic fiber prepreg sheet is heated; (B) the thermoplastic fiber prepreg sheet is wound on the working surface by a core mold unit; (C) Repeat this step (A) and this step (B), so that a plurality of the thermoplastic fiber prepreg sheets are wound and stacked on the core mold unit, and the latter piece of the thermoplastic fiber prepreg sheet The head end and the tail end of the previous thermoplastic fiber prepreg sheet are staggered in the circumferential direction to form an upper tube blank, a lower tube blank, a riser tube blank, two rear upper fork tube blanks, and two upper fork tube blanks. (D) the upper tube preform, the lower tube preform, the riser tube preform, the bottom stay tube preforms and the bottom stay tube preforms together with the mandrel unit are moulded and hot-pressed, Make the upper tube blank, the lower tube blank, the riser tube blank, the rear seat fork tube blanks and the rear fork tube blanks to be respectively formed into an upper tube piece, a lower tube piece, a riser tube piece, and two rear seat fork tube pieces and two chainstays; (E) open the mold and take out the upper pipe, the lower pipe, the riser, the seat fork pipe and the chainstay together with the core mold unit; (F) the core The die unit is pulled out from the upper tube, the lower tube, the riser, the seat stay tubes and the chain stay tubes; and (G) attaching a head tube to the upper tube and the lower tube in At the same time, connect a connector with the upper pipe, the riser and the rear seat fork pipes, connect a bottom bracket with the lower pipe, the riser and the rear fork pipes, and connect the Each of the two rear wheel dropout members is connected to a corresponding one of the seat fork tubes and a corresponding one of the seat fork tubes to form a frame. The method for forming a thermoplastic composite frame according to claim 1, wherein, in the step (A), the worktable is a heating table, and the thermoplastic fiber preform is heated through the worktable through the release paper. Dip sheet. The method for forming a thermoplastic composite frame according to claim 1, wherein, in the step (A), a heating lamp source is also prepared, and the thermoplastic fiber prepreg sheet is irradiated by the heating lamp source to The thermoplastic fiber prepreg sheet is heated. The method for forming a thermoplastic composite frame according to claim 1, wherein, in the step (A), the temperature of heating the thermoplastic fiber prepreg sheet is between 70°C and 200°C. The method for forming a thermoplastic composite frame according to claim 1, wherein, in the step (D), the temperature of the hot-pressing into the mold is between 130°C and 320°C. The method for forming a thermoplastic composite frame as claimed in claim 1, further comprising a step (H) after the step (G), wherein in the step (G), the head pipe is attached to the upper The pipe fitting and the lower pipe fitting are bonded, the connecting piece is bonded with the upper pipe fitting, the riser fitting and the rear seat fork fittings with glue, and the bottom pipe fitting and the lower pipe fitting, the riser fitting and the Chainstays are glued together, using glue to attach each rear dropout to the One of the corresponding rear upper fork pipes and the corresponding one of the rear lower fork pipes are bonded. In this step (H), the frame is placed in an oven for heating to cure the glue, and the heating temperature of the oven is between At 30℃~90℃. The method for forming a thermoplastic composite frame as claimed in claim 6, wherein, in the step (G), the head pipe member has a head pipe portion, a front upper pipe connected to the head pipe portion and extending rearwardly. a connecting part, and a front connecting part of the lower pipe connected with the head pipe part and extending backward; the connecting piece has an upper connecting part of the seat pipe, a rear connecting part of the upper pipe connected with the upper connecting part of the seat pipe and extending forwardly a connecting part, and a front connecting part of the seat fork which is connected with the upper connecting part of the seat pipe and extends rearward; a connecting part, a lower connecting part of the riser connected to the crank pipe part and extending upward, and a front connecting part of the chainstay connected to the crank pipe part and extending backward, the upper pipe part is connected to the front of the upper pipe between the connection part and the rear connection part of the upper pipe, the lower pipe piece is connected between the front connection part of the lower pipe and the rear connection part of the lower pipe, the riser piece is connected to the upper connection part of the riser pipe and the lower connection part of the riser pipe The front ends of the seat stay tubes are connected with the front connecting part of the seat stay, the front ends of the seat stay tubes are connected with the front connection part of the chain stay, and each rear wheel hook piece has a hook part, a rear seat stay connecting part connected with the hook part, and a chain stay rear connecting part connected with the hook part, the seat stay rear connecting part of each rear wheel dropout part corresponds to the corresponding one of the seat stay rear connecting parts. The rear end of a chainstay pipe is connected, and the chainstay rear connecting part of each rear wheel dropper is connected with the rear end of the corresponding one of the chainstay pipes. The method for forming a thermoplastic composite frame according to claim 1, wherein In the step (A), the material of the thermoplastic fiber prepreg sheet is unidirectional carbon fiber impregnated with thermoplastic resin, and the weight percentage of the unidirectional carbon fiber is between 40% and 70%. The weight percentage of the molding resin is between 30% and 60%. The method for forming a thermoplastic composite frame according to claim 1, wherein, in the step (A), the thermoplastic fiber prepreg is made of a carbon fiber woven cloth impregnated with a thermoplastic resin, and the carbon fiber The weight percentage of the woven cloth is between 40% and 70%, and the weight percentage of the thermoplastic resin is between 30% and 60%. A method for forming a thermoplastic composite frame tube, comprising: (A) preparing a workbench, and a release paper placed on the top surface of the workbench, the release paper has a work surface, and a thermoplastic is formed The fiber prepreg sheet is placed on the working surface, and the thermoplastic fiber prepreg sheet is heated; (B) the thermoplastic fiber prepreg sheet is wound on the working surface by a core mold unit; (C) ) Repeat the step (A) and the step (B), so that a plurality of the thermoplastic fiber prepreg sheets are wound and stacked on the core mold unit, and the latter piece of the thermoplastic fiber prepreg sheet The head end of the material and the tail end of the previous thermoplastic fiber prepreg sheet are staggered in the circumferential direction to form a tube blank; (D) the tube blank together with the core mold unit is hot-pressed into the mold to make The tube blank is formed into a pipe; and (E) mold is opened to remove the pipe together with the mandrel unit; and (F) Pulling out the mandrel unit from the pipe.

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