TWI773114B - Manufacturing method of aluminum alloy pipe for bicycle - Google Patents

Abstract

A method for manufacturing an aluminum alloy pipe for bicycles, comprising the following steps:

Prepare the main body of the pipe material: take the aluminum alloy profile to make the main body of the annular pipe material, and form several grooves on the side edge of the main body of the pipe material;

Prepreg preparation: fiber material is coated with liquid thermosetting resin, and prepreg is prepared accordingly;

Filling the prepreg: filling the prepreg into each of the grooves;

Winding the resin shrink film: winding the long strip-shaped resin shrink film around the pipe body provided with the prepreg;

Curing and molding: heating the assembly of the pipe body, the prepreg and the resin shrinkable film to shrink the resin shrinkable film, and the thermosetting resin is cured, thereby forming a reinforcing body; and

Removing the resin shrink film: removing the resin shrink film to obtain an aluminum alloy pipe with the reinforcing body.

Description

Manufacturing method of aluminum alloy pipe for bicycle

The present invention relates to an aluminum alloy pipe material applied to bicycles, and more particularly, to a manufacturing method of an aluminum alloy pipe material for bicycles.

Generally, the components of bicycles made of pipes include handlebars, seat tubes, frames and wheel frames; the frame includes top tubes, down tubes, seat tubes, seat forks and chain forks. When the wheel frame is manufactured, a straight pipe with a wheel frame section is extruded, cut and rolled into a circular shape according to different outer diameters, and then welded to form the wheel frame.

The pipes used in bicycles can be divided into aluminum alloy pipes and carbon fiber composite pipes according to the material. Among them, aluminum alloy pipes are mostly made of 6061 aluminum alloy or 7075 aluminum alloy, and the specific gravity of 6061 aluminum alloy is 2.70. g/cm ³ , the aluminum alloy material numbers commonly used for making bicycle pipes are 6061-O, 6061-T4, 6061-T6, 6061-T651 and 6061-T42. The specific gravity of 7075 aluminum alloy is 2.80g/cm ³ . The commonly used material numbers for pipes are 7075-O, 7075-T6 and 7075-T652, and the specific gravity of the carbon fiber composite material is 1.5g/cm ³ .

It can be seen that the strength/weight ratio of carbon fiber composite materials is obviously better than that of aluminum alloys, but the price of carbon fiber composite materials is more expensive than that of aluminum alloys, which makes the pipes made of carbon fiber composite materials difficult to popularize, and the strength of aluminum alloy pipes is lower than that of carbon fiber. Composite pipe.

The main purpose of the present invention is to provide a manufacturing method of an aluminum alloy pipe for bicycles. With the pioneered manufacturing method, the strength of the aluminum alloy pipe can be improved by the arrangement of the reinforcing body.

In order to meet the aforementioned purpose, the present invention relates to a method for manufacturing an aluminum alloy pipe for bicycles, comprising the following steps:

Prepare the main body of the pipe material: take a straight tubular aluminum alloy profile with a predetermined section as the blank material, make the blank material into the pipe material body of the bicycle parts, and then form several grooves on the side edge of the pipe material body;

Prepreg preparation: fiber material is coated with liquid thermosetting resin, and prepreg is prepared accordingly;

Filling the prepreg: before the thermosetting resin is not cured, the prepreg is filled into each of the grooves;

Winding resin shrink film: stretch and obliquely twist and wrap the main body of the pipe provided with the prepreg. The resin shrink film is made of a thermoplastic resin that can be stretched and deformed and can be thermally shrunk;

Curing molding: heating the assembly of the pipe body, the prepreg and the resin shrink film for an appropriate time, the heating temperature is the thermosetting temperature of the thermosetting resin, and the resin shrink film shrinks to form pressure on the prepreg , according to curing the thermosetting resin, the fiber material and the thermosetting resin are combined to form a reinforcement; and

Removing the resin shrink film: removing the resin shrink film to obtain an aluminum alloy pipe with the reinforcing body.

By executing the above-mentioned manufacturing method, the aluminum alloy pipe material can be produced, and the overall strength of the aluminum alloy pipe material can be improved by the reinforcing body.

01: Aluminum alloy pipe

10:- Pipe body

12: Groove

20: Prepreg

30: Resin shrink film

40: Reinforcement

3: Partially enlarged and shown in Figure 3

W: width

D: depth

[FIG. 1] is a flow chart of Embodiment 1 of the present invention.

[FIG. 2] is a partial perspective view of a pipe material body obtained by performing the step of preparing a pipe material body in Embodiment 1 of the present invention, showing a state in which a section of the pipe material body is cut.

[Fig. 3] is a partial enlarged view of Fig. 2. [Fig.

[FIG. 4] is a schematic diagram of the implementation state of performing the step of wrapping the resin shrink film in the first embodiment of the present invention.

[Fig. 5] is a partial three-dimensional schematic view of the aluminum alloy pipe obtained by implementing the first embodiment of the present invention, showing the state of a section of the aluminum alloy pipe.

[Fig. 6] is a partial perspective view of the pipe body obtained by performing the process of preparing the pipe body in the second embodiment of the present invention, showing the state of a section of the pipe body.

The technical feature of the present invention lies in the manufacturing method of the aluminum alloy pipe material for bicycles, so the drawings only illustrate the relatively complex cross-sectional shape of the wheel frame as an example. As shown in FIG. 1 to FIG. 5 , Embodiment 1 of a method for manufacturing an aluminum alloy pipe for bicycles of the present invention includes the following steps:

Prepare the main body of the pipe material: take a straight tubular aluminum alloy profile with a predetermined cross-section as the blank material, make the blank material into the pipe material body (10) of the bicycle parts, and then form several lines on the side edge of the pipe material body (10). groove (12).

Preparation of prepreg: The fiber material is coated with a liquid thermosetting resin, whereby a prepreg (20) is prepared. The aforementioned fiber material is at least one selected from carbon fibers, glass fibers, Kevlar fibers, boron fibers, and titanium fibers. When choosing more than two different fibers When the dimensional material is used, different fiber materials can be implemented by stacking, for example, glass fiber is used for the bottom layer, and carbon fiber is used for the upper layer; after the stacking is completed, liquid thermosetting resin is applied to form the prepreg (20).

Filling the prepreg: before the thermosetting resin is cured, the prepreg (20) is filled into each of the grooves (12).

Winding the resin shrinkable film: the long strip-shaped resin shrinkable film (30) is stretched, and the pipe body (10) provided with the prepreg (20) is wound obliquely, and the resin shrinkable film (30) is stretchable. Extensible and heat-shrinkable thermoplastic resin.

Curing molding: the assembly of the pipe body (10), the prepreg (20) and the resin shrinkable film (30) is heated for an appropriate time, and the heating temperature is the thermosetting temperature of the thermosetting resin, so that the resin The shrink film (30) shrinks and tightly binds the prepreg (20), and the resin shrink film (30) forms pressure on the prepreg (20), according to which the thermosetting resin is cured, the fiber material and the thermosetting resin Combined to form reinforcement (40). as well as

Removing the resin shrink film: removing the resin shrink film (30) to obtain an aluminum alloy pipe (01) with the reinforcing body (40).

By carrying out the aforementioned first embodiment, the aluminum alloy pipe (01) can be obtained, and the aluminum alloy pipe (01) comprises a pipe body (10) and a plurality of reinforcements (40), wherein the pipe body (10) It is composed of a tubular aluminum alloy profile, the reinforcing body (40) is formed by combining the fiber material and the thermosetting resin, and the reinforcing body (40) is embedded in the main body (10) of the pipe material. According to this, the aluminum alloy pipe material The overall strength of (01) is improved by the reinforcing body (40), and the main body (10) of the pipe occupies the main weight and volume of the aluminum alloy pipe (01), so that the price and strength can be balanced, with high industrial value.

Further, the groove (12) is a dovetail groove, which is a better choice for implementation. Therefore, after the reinforcing body (40) is formed, the reinforcing body (40) is not easy to come out of the groove (12), and the aluminum alloy pipe (01) is applied to the bicycle. and vibration, it is difficult to make the reinforcing body (40) separate from the main body (10) of the pipe material, thereby improving the positioning reliability of the reinforcing body (40); the width W of the groove (12) at the bottom of the groove is 10mm to 25mm, the depth D of the groove (12) is 0.3mm to 0.9mm, the size of the width W and the depth D, the proportional relationship between the width W and the depth D, can be changed as needed, not with the aforementioned Examples are limited.

The grooves (12) are formed in an annular shape along the side edges of the pipe body (10), and the grooves (12) are respectively arranged on both sides of the pipe body (10). The grooves (12) The number of can be changed as needed, and is not limited to the illustration in the drawings.

When performing the step of filling the prepreg, before the prepreg (20) is filled into the groove (12), an adhesive may be optionally applied to the interior of the groove (12), so that the prepreg (20) 20) After being arranged in the groove (12), the prepreg (20) is not easily separated from the groove (12), thereby improving the positioning reliability of the prepreg (20) in the groove (12) , so as to facilitate the execution of the subsequent step of wrapping the resin shrink film.

The thermosetting resin constituting the prepreg (20) is any one selected from unsaturated polyester resin, epoxy resin, phenolic resin and polyurethane resin. One, in the first embodiment, epoxy resin is used as the thermosetting resin; the resin shrink film (30) is a transversely stretched polypropylene film, a longitudinally stretched polypropylene film or a longitudinally and transversely biaxially stretched polypropylene film, and an epoxy resin is selected in conjunction with As the thermosetting resin, longitudinal and transverse biaxially oriented polypropylene film is used in Example 1, which is a better choice for implementation. The fiber material constituting the prepreg (21) needs to use at least one of carbon fiber, glass fiber, Kevlar fiber, boron fiber and titanium fiber depending on different conditions such as strength and subsequent processing.

Based on the resin shrink film (30) being a longitudinal and transverse biaxially oriented polypropylene film, the The resin shrink film (30) is thermally shrunk; based on the selection of epoxy resin as the thermosetting resin, the curing and molding step is an assembly of the pipe body (10), the prepreg (20) and the resin shrink film (30) , placed in a space of 110° C. to 130° C. for 1 hour to 3 hours, the thermosetting resin is cured, and the reinforcing body (40) is formed.

As shown in FIG. 6 , the second embodiment is obtained by changing the first embodiment. The second embodiment is mainly different from the first embodiment in that the groove (12) is along the side edge and the ring of the pipe body (10). The inner edge of the shape forms a spiral.

By changing the number of the grooves (12), the spatial form of the grooves (12) disposed in the pipe body (10) and the shape of the grooves (12), the reinforcing body (40) can be correspondingly changed in the The spatial shape of the pipe body (10) and the shape of the reinforcing body (40) further change the strength improvement degree of the aluminum alloy pipe (01) and the strength improvement of the aluminum alloy pipe (01) in a specific direction.

Claims (9)

A method for manufacturing an aluminum alloy pipe for bicycles, comprising the following steps: preparing a pipe body: taking a straight tubular aluminum alloy profile with a predetermined cross-section as a blank, making the blank into a pipe body of a bicycle component, and then placing the Several grooves are formed on the side edge of the main body of the pipe; Prepreg preparation: the fiber material is coated with liquid thermosetting resin, and the prepreg is prepared accordingly; Filling the prepreg: Before the thermosetting resin is cured, the prepreg is prepared. The prepreg is filled into each of the grooves; before the prepreg is filled into the groove, an adhesive is applied to the interior of the groove, thereby improving the positioning reliability of the prepreg in the groove; winding Resin shrink film: a long strip-shaped resin shrink film is stretched and obliquely wound around the pipe body provided with the prepreg. The resin shrink film is made of a thermoplastic resin that can be stretched and deformed and can be heat-shrinked; curing and molding : The assembly of the main body of the pipe, the prepreg and the resin shrink film is heated for an appropriate time, and the heating temperature is the thermosetting temperature of the thermosetting resin, so that the resin shrink film shrinks to form pressure on the prepreg, according to The thermosetting resin is cured, the fiber material and the thermosetting resin are combined to form a reinforcing body; and the resin shrink film is removed: the resin shrink film is removed to obtain an aluminum alloy pipe with the reinforcing body. The method for manufacturing an aluminum alloy pipe for bicycles according to claim 1, wherein the groove is a dovetail groove, thereby improving the positioning reliability of the reinforcing body. The method for manufacturing an aluminum alloy pipe for bicycles according to claim 2, wherein the width of the groove at the bottom of the groove is 10 mm to 25 mm, and the depth of the groove is 0.3 mm to 0.9 mm. The method for manufacturing an aluminum alloy pipe for bicycles according to any one of claims 1 to 3, wherein the groove is formed in a circular shape along the side edge of the pipe body. The method for manufacturing an aluminum alloy pipe for bicycles according to any one of claims 1 to 3, wherein the groove is formed in a spiral shape along the side edge and the annular inner edge of the pipe body. The method for producing an aluminum alloy pipe for bicycles according to claim 1, wherein the thermosetting resin is any one selected from unsaturated polyester resins, epoxy resins, phenolic resins and polyurethane resins. The method for producing an aluminum alloy pipe for bicycles according to claim 1, wherein the resin shrinkable film is a transversely stretched polypropylene film, a longitudinally stretched polypropylene film or a longitudinally and transversely biaxially stretched polypropylene film. The method for manufacturing an aluminum alloy pipe for bicycles as claimed in claim 1, wherein the curing and forming step is to place the pipe body in a space of 110°C to 130°C for 1 hour to 3 hours to form the reinforcing body. The method for producing an aluminum alloy pipe for bicycles according to claim 1, wherein the fiber material is at least one selected from the group consisting of carbon fiber, glass fiber, Kevlar fiber, boron fiber and titanium fiber.

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