Preparation method of racket with high forming quality

Abstract

The invention discloses a preparation method of a racket with high forming quality, which comprises the following steps: (1) prefabricating an uncured racket body with a hollow cavity inside by using fiber cloth, and arranging an inflatable bag and / or an unfoamed foaming material in the hollow cavity to form a semi-finished product; (2) the semi-finished product is placed in a forming mold, the forming mold is placed in a vacuum cavity, and an inflation bag is connected with an inflation device located outside the vacuum cavity; (3) vacuumizing the vacuum chamber to a vacuum state by using a vacuumizing device, heating the semi-finished product by using the forming mold, and inflating the inflatable bag by using an inflating device; the forming mold is arranged in the vacuum cavity, under the action of thermal expansion of the foaming material and / or inflation and pressure maintaining of the inflation bag, the racket body expands outwards to be completely attached to the inner wall of the forming mold under the vacuum action, the forming quality of the racket is effectively improved, the product percent of pass is higher, and convenience is brought to production operation.

Description

Technical Field

[0001] The invention relates to the technology of racket field, in particular to a method for preparing a racket with high molding quality. Background Art

[0002] Rackets (such as badminton rackets, tennis rackets, etc.) are high-explosive sports equipment, with the following characteristics: less material usage, higher net pressure tension on the racket frame, and greater deformation of the middle tube when hitting the ball. In the development of high-performance badminton rackets and tennis rackets, world-renowned brands hope to make breakthroughs in production technology and structural design in order to lead the market.

[0003] Take a badminton racket as an example. A badminton racket is generally composed of a racket frame, a handle, and a middle tube connecting the racket frame and the handle. The length of a badminton racket does not exceed 68 cm, of which the length of the handle and the middle tube does not exceed 42 cm, the racket frame does not exceed 25 cm, and the width is 20 cm. With the development of science and technology, the development of rackets is moving towards lighter weight, harder rackets, better middle tube elasticity, and smaller air resistance.

[0004] At present, rackets are mainly made of carbon fiber. During the preparation, a fiber cloth is first used to prefabricate an uncured racket body with a hollow cavity inside, and an air bag and / or unfoamed foamed material are arranged in the hollow cavity to form a semi-finished product. Then, the semi-finished product is placed in a molding mold for heating. During the heating process, the foaming material expands due to the heat or the air bag is inflated and pressurized, so that the racket body is squeezed outward and fits against the inner wall of the cavity of the molding mold. After heating for a certain period of time, the racket body can be cured to form a finished racket.

[0005] However, in the prior art, the racket body is squeezed only by the pressure generated by the expansion of the foam material or the inflation of the air bag, and cannot be completely fitted with the inner wall of the cavity of the molding mold, so some small structures or sharp structures cannot be formed, and bubbles are easily present inside, resulting in poor molding quality of the racket and low product qualification rate, which brings inconvenience to production operations. Therefore, it is necessary to study a solution to solve the above problems. Summary of the invention

[0006] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a method for preparing a racket with high molding quality, which can effectively solve the problem of poor molding quality of existing rackets.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A method for preparing a racket with high molding quality comprises the following steps:

[0009] (1) Prefabricating an uncured racket body having a hollow cavity inside using fiber cloth, and providing an inflatable bag and / or unfoamed foamed material in the hollow cavity, thereby forming a semi-finished product;

[0010] (2) placing the semi-finished product in a forming mold, placing the forming mold in a vacuum chamber, and connecting the inflatable bag to an inflating device located outside the vacuum chamber;

[0011] (3) using a vacuum device to evacuate the vacuum chamber to a vacuum state, allowing the forming mold to heat the semi-finished product, and allowing the inflation device to inflate the inflatable bag;

[0012] (4) Under the action of thermal expansion of the foam material and / or inflation of the air bag to maintain pressure, combined with the action of vacuum, the racket body expands outward and completely fits the inner wall of the molding mold;

[0013] (5) After the racket body is heated for a period of time and solidified, the finished racket can be obtained.

[0014] As a preferred solution, the molding die includes an upper die and a lower die, and the upper die and the lower die are combined to form a cavity, and the semi-finished product is placed in the cavity.

[0015] As a preferred solution, when the hollow cavity contains both the foaming material and the inflatable bag, the foaming material is located outside the inflatable bag or inside the inflatable bag.

[0016] As a preferred solution, the fiber cloth is carbon fiber cloth.

[0017] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that:

[0018] By placing the molding mold in a vacuum chamber, the foam material expands due to heat and / or the air bag is inflated and pressurized, and the vacuum is used to make the racket body expand outward and fit completely with the inner wall of the molding mold. Therefore, some small or sharp structures can be formed, and the generation of internal bubbles can be reduced, thereby effectively improving the molding quality of the racket, increasing the product qualification rate, and bringing convenience to production operations.

[0019] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a cross-sectional view of a first preferred embodiment of the present invention;

[0021] Figure 2 is another cross-sectional view of the first preferred embodiment of the present invention;

[0022] Figure 3 is a cross-sectional view of a second preferred embodiment of the present invention;

[0023] Figure 4 is another cross-sectional view of the second preferred embodiment of the present invention;

[0024] Figure 5 is a cross-sectional view of a third preferred embodiment of the present invention;

[0025] Figure 6 It is another cross-sectional view of the third preferred embodiment of the present invention.

[0026] Description of the accompanying drawings:

[0027] 10. Racket body 11. Hollow cavity

[0028] 20. Foaming material 30. Forming mold

[0029] 31. Upper die 32. Lower die

[0030] 301, cavity 40, vacuum chamber

[0031] 50. Inflatable bag 60. Inflating device;

[0032] 70. Vacuum extraction device. DETAILED DESCRIPTION

[0033] Please refer to Figure 1 to Figure 2 As shown, it shows the specific structure of the first preferred embodiment of the present invention. This embodiment discloses a method for preparing a racket with high molding quality, including the following steps:

[0034] (1) A racket body 10 having an uncured hollow cavity 11 is prefabricated using fiber cloth, and an unfoamed foaming material 20 is arranged in the hollow cavity 11, thereby forming a semi-finished product. In this embodiment, the fiber cloth is a carbon fiber cloth.

[0035] (2) The semi-finished product is placed in a molding die 30, and the molding die 30 is placed in a vacuum chamber 40. The molding die 30 includes an upper die 31 and a lower die 32, and the upper die 31 and the lower die 32 are combined to form a cavity 301, and the semi-finished product is placed in the cavity 301.

[0036] (3) The vacuum chamber 40 is evacuated to a vacuum state by using the vacuum evacuation device 70, and the molding die 30 is used to heat the semi-finished product.

[0037] (4) Under the action of thermal expansion of the foam material and the effect of vacuum, the racket body 10 expands outward and completely fits the inner wall of the molding mold 30 .

[0038] (5) After the racket body 10 is heated for a period of time and solidified, a finished racket can be obtained.

[0039] Please refer to Figure 3 to Figure 4 As shown, it shows the specific structure of the second preferred embodiment of the present invention. This embodiment discloses a method for preparing a racket with high molding quality, including the following steps:

[0040] (1) A racket body 10 is prefabricated with fiber cloth, which is uncured and has a hollow cavity 11 inside, and an inflatable bag 50 is arranged in the hollow cavity 11, so as to form a semi-finished product. In this embodiment, the fiber cloth is carbon fiber cloth.

[0041] (2) The semi-finished product is placed in a molding die 30, and the molding die 30 is placed in a vacuum chamber 40, and the inflatable bag 50 is connected to an inflating device 60 located outside the vacuum chamber 40. The molding die 30 includes an upper die 31 and a lower die 32, and the upper die 31 and the lower die 32 are combined to form a cavity 301, and the semi-finished product is placed in the cavity 301.

[0042] (3) The vacuum chamber 40 is evacuated to a vacuum state by using the vacuum pump 70 , the molding die 30 is used to heat the semi-finished product, and the inflation device 60 is used to inflate the inflation bag 50 .

[0043] (4) Under the action of the inflation and pressure-maintaining of the air bag 50 and the action of the vacuum, the racket body 10 expands outward and completely fits against the inner wall of the molding mold 30 .

[0044] (5) After the racket body 10 is heated for a period of time and solidified, a finished racket can be obtained.

[0045] Please refer to Figures 5 and 6 As shown, it shows the specific structure of the third preferred embodiment of the present invention. This embodiment discloses a method for preparing a racket with high molding quality, including the following steps:

[0046] (1) A racket body 10 is prefabricated with fiber cloth, which is uncured and has a hollow cavity 11 inside. An air bag 50 and unfoamed foam material 20 are arranged inside the hollow cavity 11, thereby forming a semi-finished product. The foam material 20 is located outside the air bag 50 or inside the air bag 50. In this embodiment, the foam material 20 is located inside the air bag 50, but this is not limited thereto.

[0047] (2) placing the semi-finished product in a molding mold 30, placing the molding mold 30 in a vacuum chamber 40, and connecting the inflation bag 50 to an inflation device 60 located outside the vacuum chamber 40; the molding mold 30 includes an upper mold 31 and a lower mold 32, the upper mold 31 and the lower mold 32 are combined to form a cavity 301, and the semi-finished product is placed in the cavity 301.

[0048] (3) The vacuum chamber 40 is evacuated to a vacuum state by using the vacuum pump 70 , the molding die 30 is used to heat the semi-finished product, and the inflation device 60 is used to inflate the inflation bag 50 .

[0049] (4) Under the action of the thermal expansion of the foam material 20 and the inflation and pressure maintenance of the air bag 50, the racket body 10 expands outward and completely fits the inner wall of the molding mold 30 in cooperation with the vacuum.

[0050] (5) After the racket body 10 is heated for a period of time and solidified, a finished racket can be obtained.

[0051] The design focus of the present invention is: by placing the molding mold in a vacuum chamber, under the action of the foaming material expanding due to heat and / or the inflation bag being inflated and pressurized, and at the same time cooperating with the action of the vacuum, the racket body expands outward and completely fits with the inner wall of the molding mold, thereby forming some small structures or sharp structures, and reducing the generation of internal bubbles, effectively improving the molding quality of the racket, and increasing the product qualification rate, which brings convenience to the production operation.

[0052] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a racket with high molding quality, characterized in that: The following steps are included: (1) Prefabricating an uncured racket body having a hollow cavity with fiber cloth, and providing an inflatable bag and / or unfoamed foam material in the hollow cavity, thereby forming a semi-finished product; (2) placing the semi-finished product in a forming mold, placing the forming mold in a vacuum chamber, and connecting the inflatable bag to an inflating device located outside the vacuum chamber; (3) using a vacuum device to evacuate the vacuum chamber to a vacuum state, allowing the forming mold to heat the semi-finished product, and allowing the inflation device to inflate the inflatable bag; (4) Under the action of thermal expansion of the foam material and / or inflation of the air bag to maintain pressure, combined with the action of vacuum, the racket body expands outward and completely fits the inner wall of the molding mold; (5) After the racket body is heated for a period of time and solidified, the finished racket can be obtained.

2. The method for preparing a racket with high molding quality according to claim 1, characterized in that: The molding die comprises an upper die and a lower die, and the upper die and the lower die are combined to form a cavity, and the semi-finished product is placed in the cavity.

3. The method for preparing a racket with high molding quality according to claim 1, characterized in that: When the hollow cavity contains both the foaming material and the inflatable bag, the foaming material is located outside the inflatable bag or inside the inflatable bag.

4. The method for preparing a racket with high molding quality according to claim 1, characterized in that: The fiber cloth is carbon fiber cloth.

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