Racket tube and plug and racket manufacturing method

Abstract

The application provides a badminton racket plug, a middle tube and a manufacturing method of a badminton racket. The plug comprises a top part and a lower part. The top part of the plug is in a linear shape. The lower part of the plug is arranged in the middle of the linear shape. An inner wall of one end of the middle tube is provided with an internal thread. An outer diameter of the lower part of the plug is larger than an inner diameter of the internal thread. The lower part of the plug is tightly matched with the internal thread in a screwed manner. An external thread corresponding to the internal thread is formed on a surface of the lower part of the plug after the matching. The top part of the plug is used for inserting into both ends of a racket frame preform. The application has the following advantages: the ability of the middle tube to rotate and adjust along the racket frame preform can be reserved. The stiffness mark of the middle tube can be on the front surface of the racket frame through rotation. The plug is matched with the middle tube in a screwed manner. The sealing between the lower part of the plug and the internal thread is good. There is no softening problem caused by a high-temperature curing process in subsequent processes due to gluing. When the stiffness of the middle tube is not suitable, the middle tube can be separated from the plug through reverse rotation, so that the middle tube can be replaced.

Description

Technical Field

[0001] This invention relates to the field of sports equipment, and more particularly to a badminton racket tube and end cap, and a method for manufacturing a badminton racket. Background Technology

[0002] Badminton shuttlecocks have high speeds and short reaction times, requiring athletes to swing their rackets quickly during the game. To reduce physical exertion, the market demands lightweight rackets with shock absorption capabilities.

[0003] Carbon fiber composites possess high specific modulus and specific strength, making them an excellent structural material widely used in defense, industry, and construction. They are particularly well-suited to the weight, strength, and torsional resistance requirements of badminton, and due to their unparalleled advantages, carbon fiber composites are widely used in badminton racket products.

[0004] A badminton racket generally consists of a frame, shaft, and handle; the frame and shaft are connected using a T-joint. The racket shaft is a hollow tubular structure, while the frame is often manufactured using foam molding technology. A long strip of foam material is coated with a carbon fiber prepreg containing epoxy resin, rolled into a tubular frame preform. Plastic T-joints are used to seal both ends of the preform, with the remaining end connected to one end of the shaft. Prepreg is then used to wrap the connection between the preform and the shaft, ensuring a tight seal and preventing the T-joint from detaching. Finally, the connected frame and shaft are placed in a mold and heated on a hot plate at 150 ± 5°C for approximately 30 minutes to cure the epoxy resin prepreg. After cooling on a cold plate at 40 ± 5°C, the racket blank is obtained.

[0005] After the rough racket blank is polished, drilled, strung, and the handle is assembled, it is then painted, a single nail is added, a back sleeve is added, and a handle skin is applied to make a complete racket.

[0006] However, during the thermoforming process of the racket, as the temperature inside the mold rises, the epoxy resin softens slowly, and its viscosity changes with temperature, going through a process of high viscosity (room temperature - 90℃) — low viscosity (90-110℃) — solidification. Under the pressure of the expanding foam material (when the temperature inside the mold is 120℃, the expansion pressure can reach 0.6-0.8Mpa), the low-viscosity epoxy resin can easily enter the middle tube along with the foam material through the gap between the T-joint plug and the middle tube. This can easily cause the following problems: reducing the expansion pressure of the foam material, causing the carbon fiber prepreg layers of the racket frame to not be tightly bonded, resulting in insufficient durability; when the flowing epoxy resin or foam material easily enters the inside of the middle tube, the produced racket is prone to noise when playing, creating a noise problem.

[0007] Therefore, when using T-joint plugs, the common practice is to apply glue to the plug and then bond it to the shaft and frame pre-formed parts to ensure the seal between the plug and the shaft and frame. However, this glued method also has the following problems. For example, since the main deformation occurs in the shaft during racket manufacturing, the stiffness control of the shaft is an important indicator of racket molding. Generally, the stiffness of the shaft is selected and marked, and the mark is placed on the front of the racket. However, with the glued method, it is not easy to rotate and adjust the position of the shaft to be in the center of the front after the glue hardens. It is also difficult to pull it out if the shaft stiffness is not suitable, resulting in a low overall operational error tolerance. At the same time, after the mold is pushed into the hot plate, the glue on the surface of the plug is prone to softening when the frame and shaft are continuously exposed to a high temperature of 150°C, resulting in poor bonding. Some glue overflows and adheres to the inner wall of the shaft, which still poses a risk of glue detachment and abnormal noise during racket use.

[0008] To address the aforementioned issues, patent CN215387424U discloses a self-locking plug for badminton rackets. This plug uses a self-locking structure to seal the foam material, while the separate connecting plug retains the ability of the shaft to rotate around the pre-formed frame, thus replacing the gluing process and avoiding its problems. However, this structure still has some shortcomings. Although the separate connecting plug effectively preserves the shaft's ability to rotate around the pre-formed frame, the gap between the two connecting blocks at the plug can still cause slight lateral wobbling when the racket is used forcefully. Furthermore, if the shaft stiffness is found to be unsuitable during racket manufacturing and needs to be replaced, the self-locking plug structure makes it difficult to pull the shaft out. Summary of the Invention

[0009] To address the issues of difficulty in adjusting the shaft position during the glued end process in racket manufacturing, and poor bonding during high-temperature foaming and shaping; and the technical problems of existing self-locking end technology causing slight lateral wobbling of the racket under heavy use and difficulty in replacing the shaft when selecting a replacement, this invention provides a badminton racket shaft and end, as well as a badminton racket manufacturing method.

[0010] The technical solution provided by this invention is as follows: a badminton racket tube and a plug, the plug including a top and a bottom, the top of the plug being in the shape of a straight line, the bottom of the plug being located in the middle of the straight line, the inner wall of one end of the tube being provided with an internal thread, the outer diameter of the bottom of the plug being larger than the inner diameter of the internal thread, the bottom of the plug being screwed into the internal thread for a tight fit, and after fitting, an external thread corresponding to the internal thread is formed on the surface of the bottom of the plug; the top of the plug is used to insert into both ends of the racket frame preform.

[0011] Furthermore, the plug is made of thermoplastic material.

[0012] Preferably, an inner groove is provided at the middle position of the top of the plug, and the depth of the inner groove extends into the interior of the lower part of the plug; the inner groove is used to accommodate the foaming material.

[0013] Furthermore, the length of the internal thread is greater than the length of the lower part of the badminton racket plug.

[0014] Furthermore, the internal thread length is 8-12mm, and the lower part of the plug is 6-10mm long.

[0015] Furthermore, the inner diameter of the internal thread is 3-4.2 mm, and the outer diameter of the lower part of the plug is 3.5-4.5 mm.

[0016] Preferably, the material of the plug is either polymethacrylimide or thermoplastic elastomer.

[0017] This invention also provides a method for manufacturing a badminton racket, comprising the following steps:

[0018] S1. Take the composite material to make the middle tube, and use a tapping tool to tap the inner wall of the middle tube to set the internal thread;

[0019] S2. Clamp the top of the plug and screw the lower part of the plug that matches the middle tube into the internal thread of the middle tube, so that the plug and the internal thread of the middle tube are tightly fitted.

[0020] S3. Place the rigid core material in the nylon tube, draw a vacuum to make the nylon tube fit tightly against the rigid core material, and then wrap the frame prepreg over the nylon tube.

[0021] S4. Stop vacuuming, remove the hard core material, and then pull out the nylon air duct to form a hollow structure in the middle of the frame prepreg.

[0022] S5. Insert the first foaming material into the hollow structure of the racket frame prepreg, preheat the racket frame prepreg, and bend the racket frame prepreg to form a racket frame preform.

[0023] S6. Insert the top of the plug into both ends of the pre-made racket frame;

[0024] S7. Apply prepreg to the connection between the pre-shaped frame and the shaft to ensure a tight fit between the shaft and the pre-shaped frame, forming the racket pre-shaped frame.

[0025] S8. Preheat the racket, place it in the set mold, push it into the forming table for heating and forming, and take it out to obtain the racket blank;

[0026] S9. Drill holes in the rough racket blank, sand it, assemble the wooden handle, spray paint and apply watermarks, drive in a single nail, and wrap the handle with leather to complete the racket production.

[0027] Furthermore, when an inner groove is provided at the middle position of the top of the plug and the depth of the inner groove extends into the interior of the lower part of the plug; step S2 also includes: inserting the second foaming material into the inner groove.

[0028] Furthermore, in step S8, the preheating temperature is set to 45-50℃; the heating and molding time is 30 minutes; the heating temperature is 155+ / -5℃; and then it is cooled to 60-65℃. The time for the racket pre-molding to rise from the preheating temperature to 155℃ is 5-8 minutes.

[0029] The advantages of this invention are: it retains the ability of the shaft to rotate and adjust along the pre-formed frame, facilitating the alignment of the shaft's stiffness markings with the front of the frame; the plug screws into the shaft, ensuring good sealing between the lower part of the plug and the internal thread, eliminating the softening issues caused by high-temperature curing processes in subsequent adhesive bonding; and if the shaft stiffness is found to be unsuitable, it can be easily detached from the plug by reverse rotation, allowing for shaft replacement. The internal groove design allows the foam material to expand, forcing the lower part of the plug to expand and forming a tighter interference fit with the inner wall of the shaft, further improving the sealing at the connection between the plug and the shaft and preventing the seepage of foam material and / or epoxy resin. The molded racket is also less prone to wobbling at the connection between the shaft and the frame, exhibiting higher stability. Attached Figure Description

[0030] Figure 1 Indication of badminton racket end cap Figure 1 ;

[0031] Figure 2 This is a schematic diagram of the shaft of a badminton racket.

[0032] Figure 3 Diagram showing the connection between the end cap and the shaft of a badminton racket. Figure 1 ;

[0033] Figure 4 Schematic diagram of the connection between the pre-formed frame and the shaft of a badminton racket. Figure 1 ;

[0034] Figure 5 Indication of badminton racket end cap Figure 2 ;

[0035] Figure 6 Diagram showing the connection between the end cap and the shaft of a badminton racket. Figure 2 ;

[0036] Figure 7 Schematic diagram of the connection between the pre-formed frame and the shaft of a badminton racket. Figure 2 . Detailed Implementation

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] This invention is designed from three aspects: material selection, end cap and central tube structure, and manufacturing process, to achieve the following functions: retaining the function of the central tube rotating around the preform of the racket frame; being detachable when the rigidity of the central tube is not properly matched; and sealing the foaming material and tightening the connection between the end cap and the central tube during the heating and shaping process of the preform of the racket frame.

[0039] The present invention has a spiral internal thread pre-set on the inner wall of the middle tube, and the plug is made of thermoplastic material or conventional plug material, but the plug structure is provided with a groove for filling with foam material.

[0040] Specifically, when the plug is made of thermoplastic material, such as Figure 1 , 2 As shown, the badminton racket plug 1 provided by the present invention is T-shaped, including an "I"-shaped top 11 and a vertical bottom 12. Correspondingly, a spiral internal thread 21 is provided on the inner wall of the tube 2. The outer diameter of the vertical bottom 12 of the "T"-shaped plug 1 is slightly larger than the inner diameter of the internal thread 21 of the tube. The length of the internal thread 21 of the tube is slightly larger than the length of the bottom 12 of the plug.

[0041] The length of the internal thread 21 in the middle tube is preferably 8-12mm, the inner diameter of the internal thread 21 is preferably 3-4.2mm, the outer diameter of the lower part 12 of the plug is preferably 3.5-4.5mm, and the length is 6-10mm.

[0042] like Figure 3 As shown, when the plug 1 mates with the central tube 2, the lower part 12 of the plug rotates into the internal thread 21. Due to the rigidity of the central tube, when the plug and the central tube mate, the internal thread 21 of the central tube is similar to a tapping die, forming an external thread 121 on the surface of the lower part 12 of the thermoplastic foamed plug that fits tightly with the inside of the central tube. This fit is tighter than directly setting an external thread on the lower part 12 of the plug. Figure 4 As shown, after the plug 1 is screwed into the middle tube 2, the two ends of the top 11 of the plug are then inserted into the preform of the racket frame. In this way, the ability of the middle tube to rotate and adjust along the preform of the racket frame is preserved, so that the stiffness mark of the middle tube is on the front of the racket frame through rotation; at the same time, when the plug 1 is screwed into the middle tube 2, the sealing between the lower part 12 of the plug and the internal thread 21 is also good, which effectively prevents epoxy resin or foam material from entering the middle tube under the pressure of the expansion of the foam material during the high-temperature shaping process of the racket frame preform, and there is no softening problem caused by the high-temperature curing process in the subsequent process of the adhesive.

[0043] Importantly, if it is found that the stiffness of the central tube is not suitable before the preform is foamed and shaped, the central tube can be easily removed from the plug by rotating it in the opposite direction, thereby replacing the central tube.

[0044] The plug is preferably made of thermoplastic materials such as polymethacrylimide (PMI) and thermoplastic elastomer (TPE). These materials have good mechanical strength and rigidity, and are easy to remain stable under high loads. They also have certain thermal expansion properties, and expand slightly during the high-temperature foaming and shaping process, which enhances the sealing between the lower part 12 of the plug and the internal thread 21.

[0045] In another preferred embodiment, regardless of whether the plug is limited to a thermoplastic material, it can be provided with a groove for filling with foam material. For example... Figure 5 , 6 As shown, an inner groove 13 is provided in the middle of the top 11 of the "T"-shaped plug, and the depth of the inner groove 13 extends into the interior of the lower part 12 of the plug. The presence of the inner groove 13 provides the lower part 12 of the plug with inward compression space, which facilitates the screwing of the plug 1 into the inner thread 21 of the middle tube or the screwing out of the middle tube 2 when replacing it; secondly, the inner groove 13 can accommodate the foaming material 5 in advance, such as... Figure 6 As shown, during the high-temperature foaming and shaping process of the preform, the expansion of the foaming material 5 forces the lower part 12 of the plug to expand, forming a tighter interference fit with the inner wall of the tube 2, further improving the sealing performance at the connection between the plug 1 and the tube 2, and preventing the foaming material and / or epoxy resin from seeping in. The molded racket is also less prone to shaking at the inner thread 21 of the tube, exhibiting higher stability.

[0046] Meanwhile, the addition of foaming material 5 during foaming can work in conjunction with the foaming material in the preform to form a more balanced foaming pressure within the frame cavity, ensuring the stability of the racket frame portion during processing.

[0047] The badminton racket manufacturing method of the present invention specifically includes the following steps:

[0048] S1. Take the composite material to make the middle tube, and use a tapping tool to tap the inner wall of the middle tube 2 to set the internal thread 21;

[0049] S2. Hold the top 11 of the plug 1 and screw the lower part 12 of the plug that matches the middle tube 2 into the internal thread 21 of the middle tube, so that the plug and the internal thread 21 of the middle tube are tightly fitted.

[0050] S3. Place the rigid core material in the nylon tube, draw a vacuum to make the nylon tube fit tightly against the rigid core material; then wrap the frame prepreg over the nylon tube according to the structural design requirements.

[0051] S4. Stop vacuuming, remove the hard core material, and then pull out the nylon air duct to form a hollow structure in the middle of the frame prepreg.

[0052] S5. According to the design, the first foaming material 4 is inserted into the hollow structure of the racket frame prepreg, the racket frame prepreg is preheated, and the racket frame prepreg is bent to form the racket frame preform 3.

[0053] S6. Insert the top 11 of the plug into both ends of the pre-made racket frame preform 3;

[0054] S7. According to the design drawing, apply prepreg to the connection between the pre-shaped frame part 3 and the middle tube, so that the middle tube 2 and the pre-shaped frame part 3 are tightly joined together to form the racket pre-shaped part;

[0055] S8. Preheat the racket, place it in the set mold, push it into the forming table for heating and forming, and take it out to obtain the racket blank;

[0056] S9. Drill holes in the rough racket blank, sand it, assemble the wooden handle, spray paint and apply watermarks, drive in a single nail, and wrap the handle with leather to complete the racket production.

[0057] In step S8, the preheating temperature is set to 45-50℃; the heating and forming time is 30 minutes; the heating temperature is 155+ / -5℃; and then it is cooled to 60-65℃. The time for the racket pre-forming temperature to rise from the preheating temperature to 155℃ is 5-8 minutes.

[0058] For a plug structure with a groove for filling with foam material, step S2 further includes: taking a suitable size of the second foam material 5 and inserting it into the inner groove 13.

[0059] Several specific implementation schemes are provided as examples to illustrate how the present invention is used in the badminton racket manufacturing method.

[0060] Example 1

[0061] The method for making a badminton racket is as follows:

[0062] S1. Take the composite material to make the middle tube, use a tapping tool, and tap the inner wall of the middle tube 2 with an M4*0.7 tap to set the internal thread 21, with a length of 10mm.

[0063] S2. Take plug 1, which is made of polymethacrylimide (PMI). Clamp the top 11 of plug 1 and screw the lower part 12 of plug 1, which is compatible with the middle tube 2, into the internal thread 21 of the middle tube. The diameter of plug is 4.0mm, which can fit tightly with the internal thread 21 of the middle tube.

[0064] S3. Place the rigid core material in the nylon tube, draw a vacuum to make the nylon tube fit tightly against the rigid core material; then wrap the frame prepreg over the nylon tube according to the structural design requirements.

[0065] S4. Stop vacuuming, remove the hard core material, and then pull out the nylon air duct to form a hollow structure in the middle of the frame prepreg.

[0066] S5. According to the design, insert the first foaming material 4 into the hollow structure of the racket frame prepreg, preheat the racket frame prepreg, set the preheating temperature to 45-50℃, and bend the racket frame prepreg to form the racket frame preform 3.

[0067] S6. Insert the top 11 of the plug into both ends of the pre-made racket frame preform 3;

[0068] S7. According to the design drawing, apply prepreg to the connection between the pre-shaped frame part 3 and the middle tube, so that the middle tube 2 and the pre-shaped frame part 3 are tightly joined together to form the racket pre-shaped part;

[0069] S8. Preheat the racket by pre-shaping, place it in the set mold, push it into the forming table and heat for 30 minutes at a temperature of 155+ / -5℃, then cool it to 60-65℃ and take it out to obtain the racket blank;

[0070] S9. Drill holes in the rough racket blank, sand it, assemble the wooden handle, spray paint and apply watermarks, drive in a single nail, and wrap the handle with leather to complete the racket production.

[0071] Technical Notes:

[0072] The racket pre-molding temperature is 45-50℃ when it enters the mold. It then enters the molding stage set at 155℃+ / -5℃, and the pre-molding temperature rises to 155℃ in approximately 5-8 minutes. For example... Figure 4 As shown, due to the heat generated by the mold, the plug 1 begins to expand in volume at 70-80℃, increasing the volume of the plug portion inserted into the middle tube 2. Since the middle tube 2 uses thermosetting resin and is already in a cured state, the expansion volume of the plug 1 is limited, thus strengthening the tightening effect at the threads. The first foam material 4 in the frame cannot overflow into the middle tube during expansion, eliminating the risk of noise and other problems caused by the adhesive bonding process. Both the plug 1 and the first foam material 4 have expansion capabilities, avoiding the risk of stress concentration caused by uneven force at the connection between the frame and the middle tube.

[0073] Example 2

[0074] The method for making a badminton racket is as follows:

[0075] S1. Take the composite material to make the middle tube, use a tapping tool, and tap the inner wall of the middle tube 2 with an M4*0.7 tap to set the internal thread 21, with a length of 10mm.

[0076] S2. Take plug 1. The plug is made of ordinary PVC material. The top 11 of plug 1 has an inner groove 13. Screw the lower part 12 of the plug that matches the middle tube 2 into the inner thread 21 of the middle tube. The diameter of the plug is 4.0mm, which can fit tightly with the inner thread 21 of the middle tube. Then take the second foaming material 5 to a suitable size and insert it into the inner groove 13.

[0077] S3. Place the rigid core material in the nylon tube, draw a vacuum to make the nylon tube fit tightly against the rigid core material; then wrap the frame prepreg over the nylon tube according to the structural design requirements.

[0078] S4. Stop vacuuming, remove the hard core material, and then pull out the nylon air duct to form a hollow structure in the middle of the frame prepreg.

[0079] S5. According to the design, insert the first foaming material 4 into the hollow structure of the racket frame prepreg, preheat the racket frame prepreg, set the preheating temperature to 45-50℃, and bend the racket frame prepreg to form the racket frame preform 3.

[0080] S6. Insert the top 11 of the plug into both ends of the pre-made racket frame preform 3;

[0081] S7. According to the design drawing, apply prepreg to the connection between the pre-shaped frame part 3 and the middle tube, so that the middle tube 2 and the pre-shaped frame part 3 are tightly joined together to form the racket pre-shaped part;

[0082] S8. Preheat the racket by pre-shaping, place it in the set mold, push it into the forming table and heat for 30 minutes at a temperature of 155+ / -5℃, then cool it to 60-65℃ and take it out to obtain the racket blank;

[0083] S9. Drill holes in the rough racket blank, sand it, assemble the wooden handle, spray paint and apply watermarks, drive in a single nail, and wrap the handle with leather to complete the racket production.

[0084] Technical Notes: The preform enters the mold at a temperature of 45-50℃, then enters the molding stage set at 155℃+ / -5℃. The preform takes approximately 5-8 minutes to heat up to 155℃. Figure 7 As shown, due to the heat generated by the mold, the second foaming material 5 begins to expand in volume at 70-80℃, increasing the volume of the plug portion inserted into the central tube 2, thereby strengthening the fastening effect at the internal threads of the central tube. The first foaming material 4 in the frame cannot overflow into the central tube during expansion, thus eliminating the risk of noise and other issues caused by the bonding process. Both the first foaming material 4 and the second foaming material 5 have expansion capabilities, avoiding the risk of stress concentration caused by uneven force at the connection between the frame and the central tube.

[0085] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A badminton racket end cap, characterized in that: The plug includes a top and a bottom. The top of the plug is in the shape of a straight line, and the bottom of the plug is located in the middle of the straight line. The inner wall of one end of the tube is provided with an internal thread. The outer diameter of the bottom of the plug is larger than the inner diameter of the internal thread. The bottom of the plug is screwed into the internal thread to fit tightly. After fitting, an external thread corresponding to the internal thread is formed on the surface of the bottom of the plug. The top of the plug is used to insert into both ends of the preform of the frame. The top of the plug is provided with an inner groove in the middle position. The depth of the inner groove extends into the interior of the bottom of the plug. The inner groove is used to accommodate the foaming material.

2. The badminton racket end cap as described in claim 1, characterized in that: The plug is made of thermoplastic material.

3. The badminton racket end cap as described in claim 2, characterized in that: The plug material is either polymethacrylimide or thermoplastic elastomer.

4. The badminton racket end cap as described in any one of claims 1 to 3, characterized in that: The length of the internal thread is greater than the length of the lower part of the badminton racket plug.

5. The badminton racket end cap as described in claim 4, characterized in that: The internal thread length is 8-12mm, and the lower part of the plug is 6-10mm long.

6. The badminton racket end cap as described in any one of claims 1 to 3, characterized in that: The inner diameter of the internal thread is 3-4.2mm, and the outer diameter of the lower part of the plug is 3.5-4.5mm.

7. A method for manufacturing a badminton racket, characterized in that, The badminton racket end cap as described in any one of claims 1 to 6 comprises the following steps: S1. Take the composite material to make the middle tube, and use a tapping tool to tap the inner wall of the middle tube to set the internal thread; S2. Clamp the top of the plug and screw the lower part of the plug that matches the middle tube into the internal thread of the middle tube to make the plug and the internal thread of the middle tube fit tightly. Then insert the second foaming material into the inner groove. S3. Place the rigid core material in the nylon tube, draw a vacuum to make the nylon tube fit tightly against the rigid core material, and then wrap the frame prepreg over the nylon tube. S4. Stop vacuuming, remove the hard core material, and then pull out the nylon air duct to form a hollow structure in the middle of the frame prepreg. S5. Insert the first foaming material into the hollow structure of the racket frame prepreg, preheat the racket frame prepreg, and bend the racket frame prepreg to form a racket frame preform. S6. Insert the top of the plug into both ends of the pre-made racket frame; S7. Apply prepreg to the connection between the pre-shaped frame and the shaft to ensure a tight fit between the shaft and the pre-shaped frame, forming the racket pre-shaped frame. S8. Preheat the racket, place it in the set mold, push it into the forming table for heating and forming, and take it out to obtain the racket blank; S9. Drill holes in the rough racket blank, sand it, assemble the wooden handle, spray paint and apply watermarks, drive in a single nail, and wrap the handle with leather to complete the racket production.

8. The method for manufacturing a badminton racket as described in claim 7, characterized in that, In step S8, the preheating temperature is set to 45-50℃; the heating and forming time is 30 minutes; the heating temperature is 155+ / -5℃; and then it is cooled to 60-65℃. The time for the racket pre-forming temperature to rise from the preheating temperature to 155℃ is 5-8 minutes.

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