CN111544867A - Racket handle and RTM (resin transfer molding) forming mold and method thereof - Google Patents
Racket handle and RTM (resin transfer molding) forming mold and method thereof Download PDFInfo
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- CN111544867A CN111544867A CN202010405619.6A CN202010405619A CN111544867A CN 111544867 A CN111544867 A CN 111544867A CN 202010405619 A CN202010405619 A CN 202010405619A CN 111544867 A CN111544867 A CN 111544867A
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- cavity
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
- A63B60/06—Handles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
- B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention relates to the technical field of resin-based composite material liquid forming, in particular to a racket handle, an RTM forming die and a forming method thereof. The racket handle includes the handle body, and the one end of this handle body has the cavity that is used for holding frame portion or club portion, is provided with the buffer layer around the cavity in the handle body, and the vibrations of racket portion to racket handle transmission can block through the buffer layer after the bat is strikeed, can effectively block the transmission of vibrations, has better shock attenuation performance, and this buffer layer is located the inside of the handle body, can not influence the rigidity on handle body surface, more does benefit to the sportsman and controls and give an emergency to the racket handle. In addition, the handle body is made of carbon fiber resin matrix composite material, and is light in weight and high in structural strength. The RTM forming die is simple in structure and can be used for batch production of racket handles with shock-absorbing layers inside. The RTM forming method utilizes the RTM forming die, prepreg and an autoclave are not needed, the equipment cost and the forming cost are effectively reduced, and the product forming precision is higher.
Description
Technical Field
The invention relates to the technical field of resin-based composite material liquid forming, in particular to a racket handle, an RTM forming die and a forming method thereof.
Background
In the present market, a racket having a hitting frame portion and a holding handle portion, such as a badminton racket or a tennis racket, is provided, and the material of the handle portion is mainly wood or plastic. Wooden racket handle intensity is low, still can appear becoming flexible fracture and ageing under the sweat of user's soaking, and simultaneously, wooden racket handle's quality is also relatively heavier, does not conform to the big trend of losing weight for the racket at present. Plastic racquet shafts are relatively small and have a filler material inside, but are generally relatively unstable in structure and have poor shock absorption.
Disclosure of Invention
It is a first object of the present invention to provide a racket shaft having a light weight, a high structural strength and a good shock-absorbing property, so as to solve the aforementioned problems.
In order to achieve the first object, in a first aspect, the present invention provides a racket shaft, which in a first mode of realization comprises a shaft body, one end of which has a cavity for mounting a frame portion or a shaft portion, the cavity extending from the end of the shaft body in the axial direction of the shaft body, and the inside of the shaft body is provided with a damping layer arranged around the cavity;
the handle body is made of carbon fiber resin matrix composite.
With reference to the first implementation manner of the first aspect of the present invention, in a second implementation manner, the racket handle further includes a counterweight body for adjusting the center of gravity of the racket;
one end of the counterweight body is provided with a threaded connecting part;
the handle body is used for installing the tip of the counter weight body and has the screw hole, and the counter weight body passes through the cooperation of threaded connection portion and screw hole and is connected with the handle body.
With reference to the first or second implementation manner of the first aspect of the present invention, in a third implementation manner, the shock absorbing layer is a PMI foam.
With reference to any one of the first to third implementation manners of the first aspect of the present invention, in a fourth implementation manner, the carbon fibers in the carbon fiber resin-based composite material are continuous long fibers.
With reference to the second implementation manner of the first aspect of the present invention, in a fifth implementation manner, the counterweight body is made of a carbon fiber resin matrix composite material.
A second object of the invention is to provide an RTM-forming mould for forming a racket shaft.
In order to achieve the second object, in a second aspect, the present invention provides an RTM forming mold for forming a racket shaft in the first, third or fourth implementation of the first aspect of the present invention, wherein in the first implementation, the RTM forming mold comprises:
the lower die is provided with a first lower die cavity matched with the lower half part of the handle body on the die matching surface of the lower die, a fixed block lower containing cavity is arranged at one end corresponding to the first lower die cavity, a fixed block is detachably mounted in the fixed block lower containing cavity, a cavity core is fixed on the fixed block and matched with the cavity, one end of the cavity core is connected with the fixed block, the other end of the cavity core extends into the first lower die cavity, and the axis of the cavity core and the die matching surface are positioned on the same plane;
the first lower cavity is communicated with at least one glue outlet;
the position, corresponding to the first lower cavity, of the matched die surface of the upper die is provided with a first upper cavity matched with the upper half part of the handle body, and one end, corresponding to the first upper cavity, of the upper die is provided with an upper fixed block accommodating cavity corresponding to the lower fixed block accommodating cavity;
the first upper cavity is communicated with at least one glue injection port;
when the lower die and the upper die are closed, the first lower die cavity and the first upper die cavity form a handle body die cavity matched with the handle body, and the cavity die core is positioned in the die handle body cavity.
In a third aspect, the present invention provides an RTM forming apparatus for forming a racket shaft according to the fifth implementation form of the first aspect of the present invention, wherein in the first implementation form thereof, the RTM forming apparatus comprises:
the lower die is provided with a first lower die cavity matched with the lower half part of the handle body on the die assembly surface of the lower die, two ends of the first lower die cavity are respectively provided with a fixed block lower containing cavity, a fixed block is detachably mounted in each fixed block lower containing cavity, a cavity core is fixed on one corresponding fixed block, the cavity core is matched with the cavity, one end of the cavity core is connected with the corresponding fixed block, the other end of the cavity core extends into the first lower die cavity, and the axis of the cavity core and the die assembly surface of the lower die are positioned on the same plane; a threaded hole mold core is fixed on the other fixing block, the threaded hole mold core is matched with the threaded hole, one end of the threaded hole mold core is fixed on the fixing block, the other end of the threaded hole mold core extends into the first lower cavity, and the threaded hole mold core and the cavity mold core are coaxially arranged;
a second lower cavity matched with the lower half part of the counterweight body is also arranged on the die joint surface of the lower die;
the first lower cavity and the second lower cavity are respectively communicated with at least one glue outlet;
the upper die is provided with a first upper die cavity matched with the upper half part of the handle body at a position corresponding to the first lower die cavity on the die joint surface of the upper die, and two ends of the first upper die cavity are respectively provided with an upper fixed block accommodating cavity corresponding to the lower fixed block accommodating cavity;
a second upper cavity is arranged at the position, corresponding to the second lower cavity, of the matched surface of the upper die, and the second upper cavity is matched with the upper half part of the counterweight body;
the first upper cavity and the second upper cavity are respectively communicated with at least one glue injection port;
when the lower die and the upper die are closed, the first lower cavity and the first upper cavity form a handle body cavity matched with the handle body, and the cavity core and the threaded hole core are respectively positioned at two ends of the handle body cavity; the second lower cavity and the second upper cavity form a counterweight body cavity matched with the counterweight body.
A third object of the present invention is to provide a RTM method of forming a racket shaft.
In order to achieve the third object, according to a fourth aspect of the present invention, an RTM method for forming a racket shaft without a weight body, mainly using the RTM mold according to the first implementation manner of the second aspect, includes the following steps:
determining the number of layers of the required two-dimensional fiber preforming body to be n layers according to the size of the racket handle, wherein n is a positive integer;
coating a release agent in the first lower cavity, the first upper cavity and the surface of the cavity core;
sequentially laying n/2 layers of two-dimensional fiber preformed bodies in a first lower cavity, coating a layer of setting agent on each laid two-dimensional preformed body, laying at least one lower half part damping layer in the laying process, and mounting a cavity core on a lower die through a fixing block to enable the cavity core to be positioned on the upper side of the laid two-dimensional fiber preformed body;
sequentially paving the remaining n/2 layers of two-dimensional fiber preformed bodies on the upper side of the cavity core, coating a layer of setting agent on each paved two-dimensional preformed body, and paving at least one upper half shock-absorbing layer in the paving process;
die assembly: and the die assembly interval between the upper die and the lower die is ensured to be zero;
injecting glue: slowly pressurizing to enable the resin to enter the handle body cavity through the glue injection port, and when the pressure is slowly increased to 0.6MPa, maintaining the pressure at 0.6MPa until no bubbles appear at the glue outlet, ending glue injection;
and (3) curing: placing the formed die after die assembly into an oven for curing;
demolding: and separating the upper die from the lower die, separating the fixing block from the lower die, driving the formed handle body to be separated from the lower die through the cavity core, and separating the cavity core from the handle body along the axial direction of the handle body.
With reference to the first implementation manner of the fourth aspect, in a second implementation manner of the fourth aspect of the present invention, the damping layer is PMI foam, before the PMI foam is laid, an adhesive film is coated on the surface of the PMI foam, and vacuum is pumped in the adhesive film at room temperature, so as to ensure that the adhesive film is tightly adsorbed on the surface of the PMI foam.
In order to achieve the third object, according to a fifth aspect of the present invention, there is provided an RTM method for forming a racket shaft, which is mainly for forming a racket shaft having a weight body by using the RTM mold according to the first implementation manner of the third aspect, wherein in the first implementation manner, the method comprises the steps of:
determining the number of layers of the required two-dimensional fiber preforming body to be n layers according to the size of the racket handle, wherein n is a positive integer;
coating a release agent in the first lower cavity, the second lower cavity, the first upper cavity, the second upper cavity, the surface of the cavity core and the surface of the threaded hole core;
sequentially laying n/2 layers of two-dimensional fiber preformed bodies in a first lower cavity, coating a layer of setting agent on each laid two-dimensional preformed body, laying at least one lower half part damping layer in the laying process, and respectively installing a cavity core and a threaded hole core in corresponding lower containing cavities of the fixing blocks through one fixing block so that the cavity core and the threaded hole core are positioned at the upper side of the laid two-dimensional fiber preformed bodies;
sequentially paving the rest n/2 layers of two-dimensional fiber preformed bodies on the upper sides of the cavity core and the threaded hole core, coating a layer of setting agent on each paved layer of two-dimensional preformed body, and paving at least one upper half part damping layer in the paving process;
placing the three-dimensional fiber prefabricated body of the counterweight body into a second lower cavity;
die assembly: and the die assembly interval between the upper die and the lower die is ensured to be zero;
injecting glue: slowly pressurizing to enable the resin to enter the handle body cavity and the counterweight body cavity through the glue injection port, and when the pressure is slowly increased to 0.6MPa, maintaining the pressure at 0.6MPa until no bubbles appear at the glue outlet, finishing glue injection;
and (3) curing: placing the formed die after die assembly into an oven for curing;
demolding: separating the upper die from the lower die, separating the two fixing blocks from the lower die, driving the formed handle body to be separated from the lower die through the cavity core and the threaded hole core, and separating the cavity core and the threaded hole core from the handle body along the axial direction of the handle body;
and separating the formed counterweight body from the mold.
In combination with the first implementation manner of the fourth aspect, in the second implementation manner of the fourth aspect, the damping layer is PMI foam, before the PMI foam is laid, an adhesive film is coated on the surface of the PMI foam, and the interior of the adhesive film is vacuumized at room temperature, so that the adhesive film is ensured to be tightly adsorbed on the surface of the PMI foam.
The technical scheme of the invention has the following advantages: the racket handle comprises a handle body, wherein one end of the handle body is provided with a cavity for accommodating the racket frame part or the racket rod part, a damping layer is arranged in the handle body around the cavity, vibration transmitted to the racket handle by the racket rod part after a racket is struck can be blocked by the damping layer, the transmission of the vibration can be effectively blocked, the racket handle has better damping performance, and the damping layer is positioned in the handle body, so that the rigidity of the surface of the handle body cannot be influenced, and the racket handle can be controlled and applied with force by players. In addition, the handle body is made of carbon fiber resin matrix composite material, and is light in weight and high in structural strength.
The racket handle is also provided with a balance weight body, the other end of the handle body is provided with a threaded hole matched with the balance weight body, and the gravity center of the racket can be conveniently adjusted by adjusting the weight or the length.
The RTM forming die provided by the invention is simple in structure and can be used for producing racket handles with shock-absorbing layers in batches.
The RTM forming method of the racket handle provided by the invention utilizes the RTM forming die, does not need prepreg and an autoclave, effectively reduces the equipment cost and the forming cost, and has higher product forming precision.
Drawings
The drawings of the present invention are provided for illustrative purposes only, and the proportion and the number of the components in the drawings do not necessarily correspond to those of an actual product.
FIG. 1 is a schematic front view of a racket shaft according to an embodiment of the present invention;
FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;
fig. 3 is a schematic half-sectional view of a counterweight body according to an embodiment of the invention;
FIG. 4 is a schematic front view showing the structure of a racket shaft according to a second embodiment of the present invention;
FIG. 5 is a schematic sectional view taken along line B-B of FIG. 4;
FIG. 6 is an exploded view of a molding die according to a third embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a lower mold according to a third embodiment of the present invention;
FIG. 8 is a schematic structural diagram of an upper mold according to a third embodiment of the present invention;
FIG. 9 is an exploded view of a molding die according to a fourth embodiment of the present invention
Fig. 10 is a schematic structural view of an upper die in the fourth embodiment of the present invention.
In the figure: 100: a racket shaft; 101: a handle body; 1011: a cavity; 1012: a shock-absorbing layer; 102: a counterweight body;
200: RTM forming mould; 201: a lower die; 2011: a first lower cavity; 2012: a lower accommodating cavity of the fixing block; 2013: a glue outlet; 2014: a second lower cavity; 202: an upper die; 2021: a first upper cavity; 2022: the fixed block is provided with an accommodating cavity; 2023: a glue injection port; 2024: a second upper cavity; 203: a fixed block; 204: a cavity mold core; 205: and (4) a threaded hole mold core.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Interpretation of terms: RTM is the acronym RTM from English Resin Transfer Molding and refers to Resin Transfer Molding technology.
Example one
Referring to fig. 1 and 2, a racket shaft 100 according to an embodiment of the present invention includes a shaft 101, wherein one end of the shaft 101 has a cavity 1011 for mounting a frame or a shaft, the cavity 1011 extends from the end of the shaft 101 along an axial direction of the shaft 101, and a shock absorbing layer 1012 is disposed around the cavity 1011 inside the shaft 101.
Wherein, the handle body 101 is made of carbon fiber resin matrix composite material.
During the use, the ball frame portion or the pole portion (the pole portion of being connected with ball frame portion) are connected with racket handle 100 through cavity 1011, the buffer layer 1012 is located handle body 101 and encircles the setting of cavity 1011, the vibrations of racket portion to racket handle 100 transmission can block through the buffer layer 1012 after the racket batting, can effectively block the transmission of vibrations, better shock attenuation performance has, this buffer layer 1012 is located the inside of handle body 101, can not influence the rigidity on handle body 101 surface, more do benefit to the sportsman and control and give an emergency to the racket handle. In addition, the handle body 101 is made of a carbon fiber resin-based composite material, and is light in weight and high in structural strength.
In some embodiments, the shock absorbing layer 1022 is made of soft material or material with good energy absorbing effect, such as rubber or PMI (polymethacrylimide) foam.
In order to facilitate adjustment of the center of gravity of the racket to accommodate users of different styles, in some preferred embodiments, referring to fig. 2 and 3, a weight body 102 is provided at the end of the handle body 101 opposite to the end having the cavity 1011 for adjusting the center of gravity of the racket.
Specifically, one end of the weight body 102 is provided with a threaded connection part, the end part of the handle body 101, which is used for installing the weight body 102, is provided with a threaded hole, the weight body 102 is in threaded connection with the handle body 101 through the matching of the threaded connection part and the threaded hole, the gravity center of the whole racket is changed by replacing weight bodies with different weights or different lengths, for example, when a player is inclined to an attack type playing method, a shorter or relatively lighter weight body 102 is selected to ensure that the gravity center of the racket is relatively close to the racket face (located on the racket frame part); when the player is inclined to defensive play, the longer or relatively heavier weight 102 is selected to ensure that the center of gravity of the racquet is closer to the handle.
In order to further improve the structural strength of the racket shaft 100, in some preferred embodiments, the carbon fibers in the carbon fiber resin-based composite material are continuous long fibers, so that the specific strength and specific stiffness of the shaft body 101 are higher and less prone to damage.
In order to reduce the overall weight of the racket as much as possible while ensuring the functions, in some preferred embodiments, the weight body 102 is also made of a carbon fiber resin-based composite material, but other pure resin materials may be used as the weight body, and particularly, the weight body is preferably formed by being molded with the handle body in the same mold by using an RTM molding process.
The racket shaft 100 may be used as a racket shaft of a badminton racket, a tennis racket, or the like, and is not limited in the present application.
Example two
Referring to fig. 4 and 5, a racket shaft 100 provided in the second embodiment is substantially the same as the first embodiment, and the description of the same parts is omitted, except that: since the racket shaft 100 is not provided with the weight 102, the shaft 101 does not need to be provided with a screw hole for connecting the weight 102.
EXAMPLE III
Referring to fig. 6 to 8, a third embodiment provides an RTM molding mold 200 capable of molding the racket shaft 100 according to any one of the first embodiment, the RTM molding mold 200 including a lower mold 201 and an upper mold 202.
Referring to fig. 6 and 7, a first lower cavity 2011 matched with the lower half part of the handle 101 is arranged on the mold closing surface of the lower mold 201, two ends of the first lower cavity 2011 are respectively provided with a fixed block lower accommodating cavity 2012, and a fixed block 203 can be detachably mounted in each fixed block lower accommodating cavity 2012 when needed.
The cavity core 204 is matched with the cavity 101 in shape and size, and has one end fixed to a fixing block 203 and detachably mounted on the lower mold 201 through the fixing block 203, and the other end extending into the first lower cavity in the axial direction of the handle 101. The axis of the cavity core 204 and the mating surface of the lower mold are located on the same plane, i.e., the lower half of the cavity core 204 is located in the first lower cavity 2011.
The shape and size of the threaded hole core 205 are matched with those of a threaded hole, one end of the threaded hole core 205 is fixed to the other fixing block 203 and is detachably mounted on the lower die 201 through the fixing block 203, the other end of the threaded hole core extends into the first lower die cavity 201 in the axial direction of the handle body 101, and the threaded hole core and the cavity core are coaxially arranged, namely, the lower half part of the threaded hole core 205 is positioned in the first lower die cavity 2011.
And a second lower cavity 2014 matched with the lower half part of the counterweight body 102 is also arranged on the die joint surface of the lower die.
The lower die 201 is provided with at least two glue outlets 2013, the first lower cavity 2011 and the second lower cavity 2014 are respectively communicated with the at least one glue outlet 2013, the number of the glue outlets 2013 can be increased according to needs, and no limitation is made herein.
As shown in fig. 6 and 8, a first upper cavity 2021 matched with the upper half of the shank 101 is provided at a position corresponding to the first lower cavity 2011 on the mating surface of the upper die 202, and two fixed block upper receiving cavities 2022 corresponding to the fixed block lower receiving cavities 2012 are provided at two ends of the first upper cavity 2021, respectively. A second upper cavity 2024 matched with the upper half part of the counterweight body 102 is further arranged on the matched die surface of the upper die 202 and at the position corresponding to the second lower cavity 2014. The upper mold 202 has at least two glue injection ports 2023, and the first upper cavity 2021 and the second upper cavity 2024 are respectively communicated with the at least one glue injection port 2023.
When the lower die 201 and the upper die 202 are closed, the first lower cavity 2011 and the first upper cavity 2021 form a handle cavity matched with the handle 1, the cavity core 204 and the threaded hole core 205 are respectively positioned at two ends in the handle cavity, and the second lower cavity 2014 and the second upper cavity 2024 form a counterweight cavity matched with the counterweight 102.
When the fiber pre-forming body is used, the corresponding fiber pre-forming body is placed in the corresponding cavity, glue is injected through the glue injection port 2023 after die assembly is carried out, and redundant glue solution flows out through the glue outlet 2013. The RTM forming die is used for manufacturing the racket handle, prepreg and an autoclave are not needed, the equipment cost and the forming cost are effectively reduced, and the product forming precision is higher. And the handle body and the counterweight body can be formed at one time, so that the mold cost and the manufacturing cost are saved, and the racket handle can be produced in batch.
In a preferred embodiment, referring to fig. 6 and 7, at least one screw hole 2031 is formed on the fixing block 203, and when the fixing block 203 is detached from the lower mold 201, a screw rod matched with the screw hole 2031 can be used to screw-engage with the fixing block 203, so as to facilitate detachment.
It should be noted that, in some other embodiments, the counterweight body 102 may also be formed separately, and especially, for a counterweight body made of a non-resin material, the counterweight body may also be formed by a conventional method other than an RTM method, which is not described herein again.
Example four
Referring to fig. 9 and 10, the fourth embodiment provides an RTM molding die 200 capable of molding the racket shaft 100 according to any one of the second embodiment, and since the racket shaft 100 is not provided with the weight body 102 in the second embodiment, compared with the RTM molding die 200 according to the third embodiment, the RTM molding die 200 according to the present embodiment eliminates the second lower cavity 2014 and the glue outlet 2013 communicating with the second lower cavity 2014 in the lower mold, and the screw hole core 205 for molding the screw hole, the fixing block 203 for fixing the screw hole core 205, and the fixing block lower receiving cavity 2012 for receiving the fixing block 203. The second upper cavity 2024 of the upper die 202 and the glue injection port 2023 communicated with the second upper cavity 2024 are correspondingly eliminated, and the upper holding cavity 2022 of the fixing block for mounting the threaded core is correspondingly eliminated. Other structures are basically the same as those of the third embodiment, and the description of the same parts is omitted.
EXAMPLE five
In the fifth embodiment, an RTM method for forming a racket shaft 100 having a weight body 102 by using the RTM forming mold 200 according to any one of the third embodiment comprises the steps of:
determining the number of layers of the required two-dimensional fiber preforming body to be n layers according to the size of the racket handle, wherein n is a positive integer;
coating a release agent in the first lower cavity, the second lower cavity, the first upper cavity, the second upper cavity, the surface of the cavity core and the surface of the threaded hole core;
sequentially laying n/2 layers of two-dimensional fiber preformed bodies in a first lower cavity, coating a layer of setting agent on each laid two-dimensional preformed body, laying at least one lower half part damping layer in the laying process, and respectively installing a cavity core and a threaded hole core in corresponding lower containing cavities of the fixing blocks through one fixing block so that the cavity core and the threaded hole core are positioned at the upper side of the laid two-dimensional fiber preformed bodies;
sequentially paving the rest n/2 layers of two-dimensional fiber preformed bodies on the upper sides of the cavity core and the threaded hole core, coating a layer of setting agent on each paved layer of two-dimensional preformed body, and paving at least one upper half part damping layer in the paving process;
placing the three-dimensional fiber prefabricated body of the counterweight body into a second lower cavity;
die assembly: and the die assembly interval between the upper die and the lower die is ensured to be zero;
injecting glue: slowly pressurizing to enable the resin to enter the handle body cavity and the counterweight body cavity through the glue injection port, and when the pressure is slowly increased to 0.6MPa, maintaining the pressure at 0.6MPa until no bubbles appear at the glue outlet, finishing glue injection;
and (3) curing: placing the formed die after die assembly into an oven for curing;
demolding: separating the upper die from the lower die, separating the two fixing blocks from the lower die, driving the formed handle body to be separated from the lower die through the cavity core and the threaded hole core, and separating the cavity core and the threaded hole core from the handle body along the axial direction of the handle body;
and (4) separating the formed counterweight body from the mold, and connecting the counterweight body with the handle body through threads to obtain the assembled racket handle.
In a preferred embodiment, the damping layer is PMI foam, before the PMI foam is laid, the surface of the PMI foam is coated with an adhesive film, and the interior of the adhesive film is vacuumized at room temperature to ensure that the adhesive film is tightly adsorbed on the surface of the PMI foam.
It should be noted that in this embodiment, the fixing agent and the release agent are only required to be used in the common fixing agent and release agent of the existing RTM process, and are not described herein again.
EXAMPLE six
Sixth embodiment provides an RTM forming method of a racket handle, which forms a racket handle 100 without a weight body using the RTM forming mold 200 according to any of the fourth embodiment, including the steps of:
determining the number of layers of the required two-dimensional fiber preforming body to be n layers according to the size of the racket handle, wherein n is a positive integer;
coating a release agent in the first lower cavity, the first upper cavity and the surface of the cavity core;
sequentially laying n/2 layers of two-dimensional fiber preformed bodies in a first lower cavity, coating a layer of setting agent on each laid two-dimensional preformed body, laying at least one lower half part damping layer in the laying process, and mounting a cavity core on a lower die through a fixing block to enable the cavity core to be positioned on the upper side of the laid two-dimensional fiber preformed body;
sequentially paving the remaining n/2 layers of two-dimensional fiber preformed bodies on the upper side of the cavity core, coating a layer of setting agent on each paved two-dimensional preformed body, and paving at least one upper half shock-absorbing layer in the paving process;
die assembly: and the die assembly interval between the upper die and the lower die is ensured to be zero;
injecting glue: slowly pressurizing to enable the resin to enter the handle body cavity through the glue injection port, and when the pressure is slowly increased to 0.6MPa, maintaining the pressure at 0.6MPa until no bubbles appear at the glue outlet, ending glue injection;
and (3) curing: placing the formed die after die assembly into an oven for curing;
demolding: and separating the upper die from the lower die, separating the fixing block from the lower die, driving the formed handle body to be separated from the lower die through the cavity core, and separating the cavity core from the handle body along the axial direction of the handle body.
In a preferred embodiment, the damping layer is PMI foam, before the PMI foam is laid, the surface of the PMI foam is coated with an adhesive film, and the interior of the adhesive film is vacuumized at room temperature to ensure that the adhesive film is tightly adsorbed on the surface of the PMI foam.
It should be noted that in this embodiment, the fixing agent and the release agent are only required to be used in the common fixing agent and release agent of the existing RTM process, and are not described herein again.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: each embodiment does not include only one independent technical solution, and in the case of no conflict between the solutions, the technical features mentioned in the respective embodiments can be combined in any way to form other embodiments which can be understood by those skilled in the art.
Furthermore, modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, without departing from the scope of the present invention, and the essence of the corresponding technical solutions does not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A racket shaft, comprising:
the handle comprises a handle body, wherein one end of the handle body is provided with a cavity for mounting a ball frame part or a ball rod part, the cavity extends from the end part of the handle body along the axial direction of the handle body, and a damping layer arranged around the cavity is arranged inside the handle body;
the handle body is made of carbon fiber resin matrix composite.
2. A racket shaft according to claim 1, characterized in that: the weight body is used for adjusting the gravity center of the racket;
one end of the counterweight body is provided with a threaded connecting part;
the handle body is used for installing the end part of the counterweight body is provided with a threaded hole, and the counterweight body is connected with the handle body through the matching of the threaded connecting part and the threaded hole.
3. A racket shaft according to claim 1, characterized in that: the shock absorption layer is PMI foam.
4. A racket shaft according to claim 1, characterized in that: the carbon fibers in the carbon fiber resin matrix composite material are continuous long fibers.
5. A racket shaft according to claim 2, characterized in that: the counterweight body is made of carbon fiber resin matrix composite.
6. An RTM-forming mould for forming a racket shaft, as claimed in claim 1, comprising:
the lower die is provided with a first lower die cavity matched with the lower half part of the handle body on the die assembly surface, a fixed block lower containing cavity is arranged at one end corresponding to the first lower die cavity, a fixed block is detachably mounted in the fixed block lower containing cavity, a cavity core is fixed on the fixed block and matched with the cavity, one end of the cavity core is connected with the fixed block, the other end of the cavity core extends into the first lower die cavity, and the axis of the cavity core and the die assembly surface are positioned on the same plane;
the first lower cavity is communicated with at least one glue outlet;
the position, corresponding to the first lower cavity, of the joint surface of the upper die is provided with a first upper cavity matched with the upper half part of the handle body, and one end, corresponding to the first upper cavity, of the upper die is provided with an upper fixing block accommodating cavity corresponding to the lower fixing block accommodating cavity;
the first upper cavity is communicated with at least one glue injection port;
when the lower die and the upper die are closed, the first lower cavity and the first upper cavity form a handle body cavity matched with the handle body, and the cavity core is positioned in the handle body cavity.
7. An RTM-forming mould for forming a racket shaft, as claimed in claim 5, comprising:
the lower die is provided with a first lower cavity matched with the lower half part of the handle body on the die assembly surface of the lower die, two ends of the first lower cavity are respectively provided with a fixed block lower containing cavity, a fixed block is detachably mounted in each fixed block lower containing cavity, a cavity core is fixed on the corresponding fixed block and matched with the cavity, one end of the cavity core is connected with the corresponding fixed block, the other end of the cavity core extends into the first lower cavity, and the axis of the cavity core and the die assembly surface of the lower die are positioned on the same plane; a threaded hole mold core is fixed on the other fixing block, the threaded hole mold core is matched with the threaded hole, one end of the threaded hole mold core is fixed on the fixing block, the other end of the threaded hole mold core extends into the first lower cavity, and the threaded hole mold core and the cavity mold core are coaxially arranged;
a second lower cavity matched with the lower half part of the counterweight body is also arranged on the die joint surface of the lower die;
the first lower cavity and the second lower cavity are respectively communicated with at least one glue outlet;
the position, corresponding to the first lower cavity, of the joint surface of the upper die is provided with a first upper cavity matched with the upper half part of the handle body, and two ends of the first upper cavity are respectively provided with an upper fixing block accommodating cavity corresponding to the lower fixing block accommodating cavity;
a second upper cavity is further arranged at the position, corresponding to the second lower cavity, of the joint surface of the upper die, and the second upper cavity is matched with the upper half part of the counterweight body;
the first upper cavity and the second upper cavity are respectively communicated with at least one glue injection port;
when the lower die and the upper die are closed, the first lower cavity and the first upper cavity form a handle body cavity matched with the handle body, and the cavity core and the threaded hole core are respectively positioned at two ends in the handle body cavity; and the second lower cavity and the second upper cavity form a counterweight body cavity matched with the counterweight body.
8. An RTM forming method of a racket handle is characterized in that: use of a RTM forming mold according to claim 6, comprising the steps of:
determining the number of layers of the required two-dimensional fiber preforming body to be n layers according to the size of the racket handle, wherein n is a positive integer;
coating a release agent in the first lower cavity, the first upper cavity and the surface of the cavity core;
sequentially paving n/2 layers of the two-dimensional fiber preformed body in a first lower cavity, coating a layer of setting agent on each paved layer of the two-dimensional preformed body, paving at least one lower half part damping layer in the paving process, and installing the cavity core on the lower die through a fixing block to enable the cavity core to be positioned on the upper side of the paved two-dimensional fiber preformed body;
sequentially paving the remaining n/2 layers of the two-dimensional fiber preformed bodies on the upper side of the cavity core, coating a layer of setting agent on each paved layer of the two-dimensional preformed bodies, and paving at least one upper shock absorption layer in the paving process;
die assembly: and the die assembly interval between the upper die and the lower die is ensured to be zero;
injecting glue: slowly pressurizing to enable the resin to enter the handle body cavity through the glue injection port, and when the pressure is slowly increased to 0.6MPa, maintaining the pressure at 0.6MPa until no bubbles appear at the glue outlet, ending glue injection;
and (3) curing: placing the formed die after die assembly into an oven for curing;
demolding: separating the upper die from the lower die, separating the fixed block from the lower die, driving the formed handle body to be separated from the lower die through the cavity core, and separating the cavity core from the handle body along the axial direction of the handle body; and/or
The damping layer is PMI foam, before laying the PMI foam, is in PMI foam surface cladding glued membrane to evacuation in the glued membrane is guaranteed that the glued membrane closely adsorbs on PMI foam surface at room temperature.
9. An RTM forming method of a racket handle is characterized in that: use of a RTM forming mold according to claim 7, comprising the steps of:
determining the number of layers of the required two-dimensional fiber preforming body to be n layers according to the size of the racket handle, wherein n is a positive integer;
coating a release agent in the first lower cavity, the second lower cavity, the first upper cavity, the second upper cavity, the surface of the cavity core and the surface of the threaded hole core;
sequentially paving n/2 layers of the two-dimensional fiber preformed body in a first lower cavity, coating a layer of setting agent on each paved layer of the two-dimensional preformed body, paving at least one lower half part damping layer in the paving process, and respectively installing the cavity core and the threaded hole core in the lower containing cavities of the corresponding fixed blocks through the fixed blocks so that the cavity core and the threaded hole core are positioned at the upper sides of the paved two-dimensional fiber preformed body;
sequentially paving the remaining n/2 layers of the two-dimensional fiber preformed bodies on the upper sides of the cavity core and the threaded hole core, coating a layer of setting agent on each paved layer of the two-dimensional preformed bodies, and paving at least one upper half part damping layer in the paving process;
placing the three-dimensional fiber prefabricated body of the counterweight body into a second lower cavity;
die assembly: and the die assembly interval between the upper die and the lower die is ensured to be zero;
injecting glue: slowly pressurizing to enable the resin to enter the handle body cavity and the counterweight body cavity through the glue injection port, and when the pressure is slowly increased to 0.6MPa, maintaining the pressure at 0.6MPa until no bubbles appear at the glue outlet, finishing glue injection;
and (3) curing: placing the formed die after die assembly into an oven for curing;
demolding: separating the upper die from the lower die, separating the two fixing blocks from the lower die, driving the formed handle body to be separated from the lower die together through the cavity core and the threaded hole core, and separating the cavity core and the threaded hole core from the handle body along the axial direction of the handle body;
and separating the formed counterweight body from the mold.
10. The molding method according to claim 9, wherein: the damping layer is PMI foam, before laying the PMI foam, is in PMI foam surface cladding glued membrane to evacuation in the glued membrane is guaranteed that the glued membrane closely adsorbs on PMI foam surface at room temperature.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010405619.6A CN111544867A (en) | 2020-05-14 | 2020-05-14 | Racket handle and RTM (resin transfer molding) forming mold and method thereof |
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| CN202010405619.6A CN111544867A (en) | 2020-05-14 | 2020-05-14 | Racket handle and RTM (resin transfer molding) forming mold and method thereof |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05177014A (en) * | 1991-12-26 | 1993-07-20 | Mizuno Corp | Racket frame for badminton and its manufacture |
| CN1172682A (en) * | 1996-06-03 | 1998-02-11 | 希勒里希和布莱德斯拜公司 | Wood baseball bat with composite coating |
| CN1348828A (en) * | 2000-10-13 | 2002-05-15 | 埃诺公司 | Bats for baseball |
| CN2732300Y (en) * | 2004-10-26 | 2005-10-12 | 超威科技股份有限公司 | Golf head counterweight changeable weight-balancer structure |
| CN201482094U (en) * | 2009-06-15 | 2010-05-26 | 卢建文 | Racket handle with counterweight device |
| CN202199056U (en) * | 2011-08-08 | 2012-04-25 | 蔡福新 | Carbon fiber handle of badminton racket |
| US20120193021A1 (en) * | 2011-02-02 | 2012-08-02 | Stanley Botten | Structures and methods for making sports shafts suitable for graphics application |
| CN103285564A (en) * | 2012-02-27 | 2013-09-11 | 尤尼克斯株式会社 | Tennis racket and method for manufacturing the same |
| CN205759504U (en) * | 2016-05-16 | 2016-12-07 | 厦门保圣复材科技有限公司 | A kind of battledore handle |
| CN107443772A (en) * | 2017-07-26 | 2017-12-08 | 南京航空航天大学 | A kind of mould and its process suitable for composite tube RTM shapings |
-
2020
- 2020-05-14 CN CN202010405619.6A patent/CN111544867A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05177014A (en) * | 1991-12-26 | 1993-07-20 | Mizuno Corp | Racket frame for badminton and its manufacture |
| CN1172682A (en) * | 1996-06-03 | 1998-02-11 | 希勒里希和布莱德斯拜公司 | Wood baseball bat with composite coating |
| CN1348828A (en) * | 2000-10-13 | 2002-05-15 | 埃诺公司 | Bats for baseball |
| CN2732300Y (en) * | 2004-10-26 | 2005-10-12 | 超威科技股份有限公司 | Golf head counterweight changeable weight-balancer structure |
| CN201482094U (en) * | 2009-06-15 | 2010-05-26 | 卢建文 | Racket handle with counterweight device |
| US20120193021A1 (en) * | 2011-02-02 | 2012-08-02 | Stanley Botten | Structures and methods for making sports shafts suitable for graphics application |
| CN202199056U (en) * | 2011-08-08 | 2012-04-25 | 蔡福新 | Carbon fiber handle of badminton racket |
| CN103285564A (en) * | 2012-02-27 | 2013-09-11 | 尤尼克斯株式会社 | Tennis racket and method for manufacturing the same |
| CN205759504U (en) * | 2016-05-16 | 2016-12-07 | 厦门保圣复材科技有限公司 | A kind of battledore handle |
| CN107443772A (en) * | 2017-07-26 | 2017-12-08 | 南京航空航天大学 | A kind of mould and its process suitable for composite tube RTM shapings |
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