阅读说明：本技术 一种自行车轮辋制造方法 (Method for manufacturing bicycle rim ) 是由 李金中 韩德玮 莫怡平 于 2021-05-19 设计创作，主要内容包括：一种自行车轮辋制造方法,在将挤压铝合金型材卷曲形成轮辋之前先行制作所需的孔,如背孔、辐条孔或者凹窝,可以直接将挤压铝合金型材置于普通机床上,并配合普通常规使用的定位装置即可完成背孔、辐条孔以及凹窝的制作,因而可大幅降低轮辋的生产成本；同时,由于可以先行在挤压铝合金型材上设置背孔、凹窝以及辐条孔等待备用,根据需求再卷曲形成所需尺寸要求的轮辋,因而对于定制数量少或者不但定制数量少且还有特殊尺寸要求的情况下,也能够完成生产,不仅适合于批量化生产,还适用于个性化定制,生产成本低,生产效率高。(A bicycle rim manufacturing approach, make the necessary hole in advance before curling and forming the rim in the extruded aluminium alloy section bar, such as the back hole, spoke hole or recess, can place the extruded aluminium alloy section bar on the ordinary lathe directly, and cooperate with the ordinary conventionally used locating device to finish the back hole, spoke hole and fabrication of the recess, therefore can reduce the production cost of the rim by a wide margin; meanwhile, the back holes, the concave holes and the spoke holes can be arranged on the extruded aluminum alloy section for standby application in advance, and the extruded aluminum alloy section is curled to form the rim with the required size requirement according to the requirement, so that the production can be completed under the condition that the customized quantity is small or not only the customized quantity is small but also the special size requirement is met, the production method is suitable for batch production and personalized customization, the production cost is low, and the production efficiency is high.)

1. A method of manufacturing a bicycle rim, comprising the steps of:

1) preparing required holes on the strip-shaped extruded aluminum alloy section bar (2);

2) curling the extruded aluminum alloy section (2) in the step 1) to form a rim.

2. A method of manufacturing a bicycle rim as claimed in claim 1, wherein: in the step 1), the extruded aluminum alloy section (2) is single-layer, and a plurality of spoke holes (1) are arranged on the single-layer strip-shaped extruded aluminum alloy section (2) at intervals.

3. A method of manufacturing a bicycle rim as claimed in claim 1, wherein: in the step 1), the extruded aluminum alloy section (2) is double-layer, a plurality of back holes (3) are arranged on the upper layer surface of the double-layer strip-shaped extruded aluminum alloy section (2) at intervals, then a plurality of spoke holes (1) are arranged on the lower layer surface at intervals, and the spoke holes (1) and the back holes (3) are in one-to-one correspondence.

4. A method of manufacturing a bicycle rim as claimed in claim 2, wherein: in the step 1), before the spoke holes (1) are manufactured, a plurality of concave grooves (4) are arranged on the spoke holes at intervals, and then the spoke holes (1) are arranged on each concave groove (4).

5. A method of manufacturing a bicycle rim as claimed in claim 3, wherein: in the step 1), before the spoke holes (1) are manufactured and after the back holes (3) are manufactured, a plurality of concave grooves (4) are arranged on the lower layer surface of the double-layer strip-shaped extruded aluminum alloy section bar (2) at intervals, and then the spoke holes (1) are arranged on each concave groove (4).

6. A method of manufacturing a bicycle rim as claimed in any one of claims 2 to 5, wherein: after the spoke holes (1) are arranged, hollow rivets are riveted into the periphery of the spoke holes.

7. A method of manufacturing a bicycle rim as claimed in claim 4 or 5, wherein: the deformation of the concave slots (4), the back holes (3) and the spoke holes (1) during curling is calculated in advance, and a certain deformation is given in advance during preparation of the concave slots (4) and the spoke holes (1) of the back holes (3), so that the diameters of the concave slots (4), the back holes (3) and the spoke holes (1) are slightly increased, and the deformation of the extruded aluminum alloy section (2) after curling is controlled to be within a preset deformation range; or when the concave grooves (4), the back holes (3) and the spoke holes (1) are prepared, the shapes of the concave grooves (4), the back holes (3) and the spoke holes (1) are made into elliptical shapes, and when the aluminum alloy section bar (2) is curled and extruded, the elliptical concave grooves (4), the back holes (3) and the spoke holes (1) are deformed to a certain amount, so that the elliptical concave grooves (4), the back holes (3) and the spoke holes (1) are deformed into holes suitable for assembling spokes and spoke caps.

8. A method of manufacturing a bicycle rim as claimed in claim 4 or 5, wherein: the depth of the concave groove (4) is more than or equal to 1.2mm and less than or equal to 2.5 mm.

9. A method of manufacturing a bicycle rim as claimed in claim 3, wherein: the back hole (3) is formed by adopting a drill bit (5) or a back hole punch (6).

10. A method of manufacturing a bicycle rim as claimed in claim 4 or 5, wherein: the concave grooves (4) and the spoke holes (1) are formed in a punch forming mode; the punches for preparing the concave grooves (4) and the spoke holes (1) can be simultaneously prepared and formed by adopting a combined punch or can be respectively formed by adopting two independent punches; when the combined punch is used for simultaneously preparing and forming, a small punch for preparing spoke holes (1) is arranged in a large punch for preparing the concave grooves (4); after the preparation of the large punch completes the recess (4), the small punch is extended out, and spoke holes (1) are prepared on the corresponding recess (4).

11. A method of manufacturing a bicycle rim as claimed in claim 10, wherein: when the concave pits (4) and the spoke holes (1) are respectively and independently prepared, the strip-shaped extruded aluminum alloy section (2) is arranged on the pit bottom die (7) to be matched with the corresponding punch heads to realize the forming of the concave pits (4), and then when the spoke holes (1) are prepared, the strip-shaped extruded aluminum alloy section (2) is arranged on the spoke hole bottom die (8) to be matched with the corresponding punch heads to realize the forming of the spoke holes (1); and when the combined punch is adopted to simultaneously prepare the concave slots (4) and the spoke holes (1), the strip-shaped extruded aluminum alloy section (2) is placed on an auxiliary bottom die which is used for forming the auxiliary spoke holes (1) and the concave slots (4) simultaneously so as to be matched with the combined punch to simultaneously form the concave slots (4) and the spoke holes (1).

12. A method of manufacturing a bicycle rim as claimed in claim 9, wherein: when the back hole (3) is prepared by adopting the drill bit (5), continuously spraying water on the extruded aluminum alloy section (2); when the back hole punch (6) is adopted to prepare the back hole (3), the extruded aluminum alloy section (2) is placed on the back hole punching bottom die (9) to be matched with the back hole punch (6) to realize the forming of the back hole (3).

Technical Field

The present invention relates to a bicycle rim manufacturing method.

Background

The rim of the bicycle is usually formed by rolling a strip-shaped extruded aluminum alloy section, and after the rim is formed by rolling, for example, a single-layer rim, a concave groove which is matched with a spoke cap is arranged on the annular wall of the rim, and a spoke hole is arranged on the concave groove; if the wheel rim is a double-layer wheel rim, a back hole is arranged on the outer annular wall of the wheel rim, a concave groove which corresponds to the back hole and is matched with the spoke cap is arranged on the inner annular wall, and spoke holes are arranged on the concave groove. However, in the prior art, the forming of the concave groove, the back hole and the spoke hole is all made after the rim is curled and formed, so the rim needs to be positioned on a production machine tool through a special positioning device, the concave groove, the back hole and the spoke hole can be conveniently made on the rim, the structure of the positioning device is complex, and the manufacturing cost of the rim is high; in addition, since the manufacturing cost is high, the method is generally suitable for mass production, and therefore, when the number of rim orders is small, or the number of orders is small and has a specific size requirement, the die sinking is expensive, the manufacturing cost is high, and the customer requirements cannot be completely met.

Disclosure of Invention

The invention aims to provide a bicycle rim manufacturing method which is low in cost, suitable for batch production and personalized customization and capable of improving the production efficiency.

The invention relates to a method for manufacturing a bicycle rim, which comprises the following steps:

1) preparing needed holes on the strip-shaped extruded aluminum alloy section;

2) curling the extruded aluminum alloy section in the step 1) to form a rim.

In the step 1), the extruded aluminum alloy section is single-layer, and a plurality of spoke holes are arranged on the single-layer strip-shaped extruded aluminum alloy section at intervals;

or, in the step 1), the extruded aluminum alloy section is double-layer, a plurality of back holes are arranged on the upper layer surface of the double-layer strip-shaped extruded aluminum alloy section at intervals, a plurality of spoke holes are arranged on the lower layer surface at intervals, and the spoke holes and the back holes are in one-to-one correspondence.

Before making the spoke holes, for a single-layer strip-shaped extruded aluminum alloy section, a plurality of dimples are arranged on the extruded aluminum alloy section at intervals, and then each dimple is provided with the spoke hole; for a double-layer strip-shaped extruded aluminum alloy profile, a plurality of dimples are arranged at intervals on the lower layer surface, and then spoke holes are arranged on each dimple.

According to the manufacturing method of the bicycle rim, the required holes such as the back hole, the spoke hole or the recess are manufactured in advance before the extruded aluminum alloy section is curled to form the rim, the extruded aluminum alloy section can be directly placed on a common machine tool, and the manufacturing of the back hole, the spoke hole and the recess can be completed by matching with a positioning device which is used in a common conventional mode, so that the production cost of the rim can be greatly reduced; meanwhile, the back holes, the concave holes and the spoke holes can be arranged on the extruded aluminum alloy section for standby application in advance, and the extruded aluminum alloy section is curled to form the rim with the required size requirement according to the requirement, so that the production can be completed under the condition that the customized quantity is small or not only the customized quantity is small but also the special size requirement is met, the production method is suitable for batch production and personalized customization, the production cost is low, and the production efficiency is high.

Drawings

Fig. 1 is a schematic structural view of the strip-shaped extruded aluminum alloy profile of the present invention (double-layer rim).

Fig. 2 and 3 are schematic views of the present invention for making back holes, dimples, and spoke holes (double rim).

FIG. 4 is a schematic view of the present invention with a hollow rivet structure (double rim).

Detailed Description

A method of manufacturing a bicycle rim, the steps comprising: (1) preparing required holes on the strip-shaped extruded aluminum alloy section bar 2; such as back holes, spoke holes, dimples, etc.; (2) and (3) curling the extruded aluminum alloy section in the step (1) to form a rim.

In the step (1), the extruded aluminum alloy section is single-layer, and a plurality of spoke holes 1 are arranged on a single-layer strip-shaped extruded aluminum alloy section 2 at intervals; the extruded aluminium alloy profile 2 is subsequently crimped to form a single-layer rim. Or, in the step (1), the extruded aluminum alloy section is double-layer, and a plurality of back holes 3 are arranged on the upper layer surface of the double-layer strip-shaped extruded aluminum alloy section 2 at intervals; then, a plurality of spoke holes 1 are arranged on the lower layer surface at intervals, and the spoke holes 1 correspond to the back holes 3 one by one; the extruded aluminium alloy profile 2 is then crimped to form a double-layer rim.

Before manufacturing the spoke holes 1, for a single-layer strip-shaped extruded aluminum alloy section, a plurality of grooves 4 are arranged on the extruded aluminum alloy section at intervals, and then each groove 4 is provided with the spoke hole 1; for the double-layer strip-shaped extruded aluminum alloy section bar 2, after the back hole 3 is prepared, a plurality of concave grooves 4 are arranged on the lower layer surface at intervals, and then spoke holes 1 are arranged on each concave groove 4.

As shown in fig. 4, after the spoke hole 1 is provided, a hollow rivet 10 is riveted around the spoke hole. The hollow rivets 10 are provided to further increase the strength of the bicycle rim.

With the above structure, in fact, when the strip-shaped extruded aluminum alloy profile 2 is curled into the rim, the prepared concave 4, back hole 3 and spoke hole 1 do not have large deformation, and the standard can still be met, so that the rim is suitable for subsequent assembly of rims. Furthermore, the deformation of the dimples 4, the back holes 3, the spoke holes 1 can be further avoided by two means: one is that the deformation of the concave slot 4, the back hole 3 and the spoke hole 1 during the curling can be calculated in advance, and a certain deformation is given in advance when the concave slot 4, the back hole 3 and the spoke hole 1 are prepared, so that the diameters of the concave slot 4, the back hole 3 and the spoke hole 1 are slightly increased, and the deformation after the curling is finished is controlled within a preset deformation range, wherein the method for calculating the deformation in advance is the prior art; secondly, when the concave 4, the back hole 3 and the spoke hole 1 are prepared, the shapes are made into elliptical shapes, when the concave 4, the back hole 3 and the spoke hole 1 are curled, a certain amount of deformation can be generated on the concave 4, the back hole 3 and the spoke hole 1, so that the concave 4, the back hole 3 and the spoke hole 1 are deformed into holes suitable for assembling spokes and spoke caps, and the holes formed after the deformation are similar to circular structures, wherein before the concave is curled, the major axis sizes of the concave 4, the back hole 3 and the spoke hole 1 are increased by 0.3mm-1mm on the basis of the diameter of the corresponding round hole on the rim with the same specification manufactured by using the traditional process, and the minor axis sizes are generally consistent with the diameter of the corresponding round hole on the rim with the same specification manufactured by using the traditional process.

The depth D of the concave 4 is more than or equal to 1.2mm and less than or equal to 2.5mm, such as 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm or 2.5 mm. In the traditional rim preparation process, the recess 4 is prepared after the curling, so the depth of the recess 4 is limited and is at most 1MM, the head of the spoke cap cannot be completely coated by the depth, the contact area of the two is small, and the connection strength is influenced; through the improvement of the preparation process, the depth of the concave groove 4 can be deepened, so that the head of the spoke cap is completely covered, the contact area of the concave groove and the head of the spoke cap is large, and the connection strength is higher.

The back hole 3 is formed by adopting a drill 5 or a back hole punch 6.

The concave 4 and the spoke hole 1 are formed by punching; the punches for preparing the concave slot 4 and the spoke hole 1 can be simultaneously prepared and formed by adopting a combined punch or can be respectively formed by adopting two independent punches; when a combined punch is adopted for simultaneous preparation and forming, a small punch for preparing spoke holes 1 is arranged in a large punch for preparing a pit 4, and the structure of the combined punch belongs to the prior art; after the preparation of the dimples 4 by the large punch, the small punch is extended out and the spoke holes 1 are prepared on the corresponding dimples 4, either oblique spoke holes 1 (as shown in fig. 2) or vertical spoke holes 1 (as shown in fig. 3) can be punched. The efficiency is higher when the combined punch is used to prepare both the spoke holes 1 and the dimples 4, while the cost is lower when the dimples 4 and the spoke holes 1 are separately prepared.

When the concave 4 and the spoke hole 1 are separately prepared, the strip-shaped extruded aluminum alloy section 2 is arranged on the dimpling bottom die 7 to be matched with the corresponding punch head to realize the forming of the concave 4, and then when the spoke hole 1 is prepared, the strip-shaped extruded aluminum alloy section 2 is arranged on the spoke hole bottom die 8 to be matched with the corresponding punch head to realize the forming of the spoke hole 1; and when the combined punch is adopted to simultaneously prepare the pits 4 and the spoke holes 1, the strip-shaped extruded aluminum alloy section 2 is placed on an auxiliary bottom die which is used for forming the auxiliary spoke holes 1 and the pits 4, so that the combined punch is matched with the combined punch to simultaneously form the pits and the spoke holes 1. The auxiliary bottom die for forming the dimpling bottom die 7, the spoke hole punching bottom die 8 and the auxiliary bottom die formed by the auxiliary spoke holes 1 and the dimples 4 is simple in structure and belongs to a conventionally used die stamping die.

When the back hole 3 is prepared by adopting the drill 5, continuously spraying water on the extruded aluminum alloy section 2 to remove drill cuttings generated when the back hole 3 is prepared; when the back hole punch 6 is adopted to prepare the back hole 3, the extruded aluminum alloy section 2 is arranged on the back hole punching bottom die 9 so as to be matched with the back hole punch 6 to realize the forming of the back hole 3.

The punches or the drill bits can be respectively arranged in a row in the moving direction of the extruded aluminum alloy section bar 2, and the forming dies matched with the punches are correspondingly arranged in a row correspondingly, and the layout mode is a conventional technical means in the field, so that the extruded aluminum alloy section bar 2 is continuously formed into the back hole 3, the concave groove 4 and the spoke hole 1 in the moving direction of the extruded aluminum alloy section bar to form a continuous production mode, and the production efficiency is improved.