CN110576929A

CN110576929A - method for forming five-way frame

Info

Publication number: CN110576929A
Application number: CN201910953751.8A
Authority: CN
Inventors: 陈锦松
Original assignee: DONGGUAN TAIHE COMPOSITE MATERIAL Co Ltd
Current assignee: DONGGUAN TAIHE COMPOSITE MATERIAL Co Ltd
Priority date: 2019-10-09
Filing date: 2019-10-09
Publication date: 2019-12-17
Anticipated expiration: 2039-10-09
Also published as: CN110576929B

Abstract

the invention relates to the field of material processing, and discloses a method for forming a five-way connection of a frame. The forming method of the frame five-way comprises the following steps: preforming the central shaft tube; attaching carbon fiber yarns for forming a connecting pipe to one end of the preformed middle shaft pipe; and compression-molding the carbon fiber yarns adhered to the end part of the preformed central shaft tube into a connecting tube so as to connect the connecting tube with one end of the central shaft tube. The invention can improve the forming quality of the frame five-way joint.

Description

Method for forming five-way frame

Technical Field

the invention relates to the technical field of material processing, in particular to a method for forming a five-way frame.

Background

the bicycle frame five-way is an important component of a bicycle frame, is arranged at the bottommost part of the bicycle frame, is simultaneously connected with a rear fork, a seat tube and a front tube in the bicycle frame, is also provided with a through hole for mounting a middle shaft, and a chain wheel is mounted on the middle shaft.

The bottom bracket tube used for mounting the middle shaft in the five-way joint of the frame has the worst working environment and higher quality requirement due to the load and dynamic friction borne by the bottom bracket tube. The forming method of the existing frame five-way is to form the whole part of the frame five-way by wind pressure at one time, the integral one-time compression molding can bring a lot of quality problems, the abnormal enlargement of the inner diameter size of the central tube can be caused, and the carbon fiber yarns are easy to distribute unevenly in the forming process due to the complex structure of the frame five-way, the inner wall and the end surface of the central tube are easy to lack of materials after forming, and the integral forming is also not convenient for the subsequent machining of the central tube.

How to improve the forming quality of the frame five-way is a technical problem to be solved by technical personnel in the field.

disclosure of Invention

Based on the above, the invention aims to provide a method for forming a frame five-way, which can improve the forming quality of the frame five-way.

In order to achieve the purpose, the invention adopts the following technical scheme:

A method for forming a frame five-way comprises a middle shaft tube used for mounting a middle shaft and a connecting tube connected with a rear fork, a seat tube and a front tube on a frame, and comprises the following steps:

preforming the bottom bracket tube;

attaching the carbon fiber yarn for forming the connecting pipe to one end of the preformed middle shaft pipe;

And compression-molding the carbon fiber yarns adhered to the preformed end part of the central shaft tube into the connecting tube so as to connect the connecting tube with one end of the central shaft tube.

further, preforming the bottom bracket tube includes the steps of:

Manufacturing a primary pipe;

machining the raw tube to form the bottom bracket tube;

and carrying out surface roughening treatment on the machined central shaft tube.

further, the primary pipe is coiled by a pipe coiling machine.

Further, the primary tube is molded.

further, the machining of the bottom bracket tube comprises the following steps:

intercepting the primary pipe with a set length;

grinding the inner wall, the outer wall and the end part of the primary tube;

And processing chamfers at the corners of the primary tube.

Further, the surface roughening treatment is carried out on the middle shaft tube obtained by machining, and the method comprises the following steps:

sand blasting the surface of the central shaft tube;

and carrying out ultrasonic cleaning on the middle shaft tube subjected to sand blasting.

further, before the preformed central shaft tube is attached to one end of the connecting tube, the method further includes:

And adhering a layer of epoxy resin adhesive to the surface of the central shaft tube.

Further, compression molding is wind pressure forming, will paste in the preforming after the well axle pipe end compression molding of carbon fiber yarn does the connecting pipe includes:

Putting the central shaft tube and the carbon fiber yarn into a pre-cavity;

and introducing high-temperature and high-pressure gas into the premoulding cavity until the carbon fiber yarn is completely attached to the premoulding cavity.

Further, will paste in after the preforming the carbon fiber yarn compression molding of well tube end portion is for the connecting pipe, still include:

And carrying out surface roughening treatment on the connecting pipe.

further, the surface roughening treatment of the connecting pipe comprises:

Sand blasting is carried out on the surface of the connecting pipe;

And carrying out ultrasonic cleaning on the connecting pipe subjected to sand blasting.

the invention has the beneficial effects that:

The forming method of the frame five-way pipe provided by the invention is characterized in that the middle shaft pipe in the frame five-way pipe is formed independently, the middle shaft pipe can be directly subjected to further fine machining during forming, the mechanical property of the middle shaft pipe is stabilized, the carbon fiber yarn for forming the connecting pipe is attached to one end of the middle shaft pipe, and the carbon fiber yarn is formed into the connecting pipe connected with one end of the middle shaft pipe by compression molding. Through the sequential molding of the central shaft tube and the connecting tube, the invention can improve the molding quality of the five-way joint of the frame.

Drawings

in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a flow chart of a method for forming a frame bottom bracket according to an embodiment of the present invention;

FIG. 2 is a flow chart of a preformed bottom bracket tube according to an embodiment of the present invention;

FIG. 3 is a flow chart of center tube machining provided by an embodiment of the present invention;

FIG. 4 is a flow chart of a surface treatment of a bottom bracket tube according to an embodiment of the present invention;

FIG. 5 is a flow chart of the frame five-way wind pressure forming according to the embodiment of the present invention;

FIG. 6 is a flow chart of the surface treatment of the connecting tube according to the embodiment of the present invention;

FIG. 7 is a schematic view of a frame bottom bracket according to an embodiment of the present invention;

FIG. 8 is a front view of a bottom bracket tube provided in accordance with an embodiment of the present invention;

Fig. 9 is a side view of a bottom bracket tube in accordance with an embodiment of the present invention.

in the figure:

1. A frame is five-way; 2. a central shaft tube; 3. and (4) connecting the pipes.

Detailed Description

in order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

as shown in fig. 1-6, the present embodiment provides a method for forming a frame five-way joint 1, and as shown in fig. 7-9, the frame five-way joint 1 manufactured by the method is composed of a bottom bracket tube 2 and a connecting tube 3, wherein the bottom bracket tube 2 is used for installing a bottom bracket, and the connecting tube 3 is used for connecting with a rear fork, a seat tube and a front tube in a frame. The molding method comprises the following steps:

S1, preforming the central shaft tube 2;

s2, adhering a layer of epoxy resin glue to the surface of the central shaft tube 2 to increase the adhesion of the central shaft tube 2;

S3, attaching the carbon fiber yarn for forming the connecting pipe 3 to one end of the preformed bottom bracket pipe 2;

s4, the carbon fiber yarns adhered to the end part of the preformed central shaft tube 2 are molded into the connecting tube 3;

S5, the surface of the connection pipe 3 is roughened.

specifically, through the shaping successively of central siphon 2 and connecting pipe 3, can directly carry out further finish machining during the shaping of central siphon 2, make central siphon 2's mechanical properties stabilize and get off, the carbon fiber yarn that will be used for forming connecting pipe 3 again laminates in central siphon 2's one end, adopt compression molding with the carbon fiber yarn shaping for the connecting pipe 3 of being connected with central siphon 2's one end, carbon fiber yarn distributes inequality because of the structure is complicated when having overcome frame five-way 1 whole one-shot forming, make the defect of the easy scarce material of inner wall and the terminal surface of central siphon 2 after the shaping.

Wherein, S1 specifically includes the following steps:

s11, manufacturing a primary tube;

s12, machining the primary manufactured pipe to form a middle shaft pipe 2;

S13, performing surface roughening treatment on the machined central siphon 2.

wherein, the primary pipe can be rolled by a pipe rolling machine or compression molding.

further, S12 specifically includes the following steps:

S121, intercepting a primary pipe with a set length;

s122, grinding the inner wall, the outer wall and the end part of the primary tube;

And S123, processing chamfers at the corners of the primary pipe.

In particular, machining is more controllable and accurate than compression molding.

Further, S13 specifically includes the following steps:

s131, sand blasting is carried out on the surface of the central shaft tube 2, and the mechanical property of the central shaft tube 2 is improved;

s132, performing ultrasonic cleaning on the sandblasted middle shaft tube 2 to remove impurities on the middle shaft tube 2.

Specifically, under the impact and cutting action of the abrasives on the surface of the bottom bracket tube 2, the surface of the bottom bracket tube 2 obtains a certain degree of cleanliness and different degrees of roughness, so that the mechanical properties of the surface of the bottom bracket tube 2 are improved, and thus the fatigue resistance of the bottom bracket tube 2 is improved. Furthermore, the adhesion between the central shaft tube 2 and a subsequent coating can be increased, the durability of the coating film is prolonged, and the leveling and decoration of the coating are facilitated.

further, the compression molding in S4 is specifically wind pressure molding, which specifically includes the following steps:

s41, placing the central shaft tube 2 and the carbon fiber yarn for forming the connecting tube 3 into a pre-cavity;

and S42, introducing high-temperature and high-pressure gas into the premoulding cavity until the carbon fiber yarn is completely attached to the premoulding cavity.

further, S5 specifically includes the following steps:

S51, performing sand blasting on the surface of the connecting pipe 3 to improve the mechanical property of the connecting pipe 3;

S52, performing ultrasonic cleaning on the connection pipe 3 after the sand blasting to remove impurities on the connection pipe 3.

it is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. a forming method of a frame five-way is characterized in that the frame five-way comprises a central shaft tube for mounting a central shaft and a connecting tube connected with a rear fork, a seat tube and a front tube on a frame, and the forming method of the frame five-way comprises the following steps:

preforming the bottom bracket tube;

2. the method for forming the frame bottom bracket of claim 1, wherein the pre-forming the bottom bracket tube comprises the following steps:

manufacturing a primary pipe;

machining the raw tube to form the bottom bracket tube;

3. the method as claimed in claim 2, wherein the primary tube is rolled by a tube rolling machine.

4. the method for forming the frame bottom bracket of claim 2, wherein the primary tube is formed by compression molding.

5. The method for forming the frame bottom bracket as claimed in claim 2, wherein the machining the bottom bracket tube comprises the following steps:

intercepting the primary pipe with a set length;

grinding the inner wall, the outer wall and the end part of the primary tube;

and processing chamfers at the corners of the primary tube.

6. the method for forming the frame bottom bracket according to claim 2, wherein the surface roughening treatment is performed on the machined bottom bracket tube, and the method comprises the following steps:

sand blasting the surface of the central shaft tube;

7. the method for forming a frame bottom bracket according to claim 1, wherein before the pre-forming the bottom bracket tube is attached to one end of the connecting tube, the method further comprises:

8. The method of claim 1, wherein the step of compression molding is a step of wind pressure molding, and the step of compression molding the carbon fiber yarns adhered to the end of the preformed bottom bracket tube into the connecting tube comprises the steps of:

Putting the central shaft tube and the carbon fiber yarn into a pre-cavity;

9. the method for forming a frame bottom bracket according to claim 1, wherein the step of molding the carbon fiber yarns adhered to the end of the preformed bottom bracket tube into the connecting tube further comprises:

and carrying out surface roughening treatment on the connecting pipe.

10. The method for forming the frame five-way according to claim 9, wherein the surface roughening treatment of the connecting pipe comprises:

sand blasting is carried out on the surface of the connecting pipe;