TW202102397A - Method of processing bicycle frame - Google Patents

Abstract

A method of processing a bicycle frame is provided, including following steps of: providing the bicycle frame, the bicycle frame including a plurality of tube members which are fixedly connected with one another and include a seat tube and a head tube; processing respective holes of the seat tube and the head tube to have their respective central axes which are located on a same plane.

Description

Bicycle frame processing method

The invention relates to a method for processing a bicycle frame.

Cycling has become more and more popular in recent years and has become one of the common leisure activities for Chinese people. In addition to general bicycles that need to meet specific performance requirements (such as mountaineering, racing, etc.), most bicycle frames strive to be lightweight, maximize mechanical strength, and improve riding comfort.

The conventional bicycle frame manufacturing process is to cut a plurality of pipe fittings according to the size, and connect the multiple pipe fittings by spot welding and full welding to form the bicycle frame, and then undergo calibration and post-processing steps to meet the specification requirements. The general post-processing steps include cutting the bearing hole of the head tube with a special machine, processing the assembly hole of the seat tube and seat post with a reamer, and processing the tube hole of the bottom tube with a special machine for tapping the bottom bracket. However, in order to achieve a lightweight effect, the tube walls of the plurality of pipe fittings are usually thin, resulting in the plurality of pipe fittings being easily deformed by heat during the welding process, and additional dimensions need to be corrected, and the correction margin after welding is also limited. The deformation of a plurality of pipe fittings exceeds the correctable range, resulting in poor dimensional accuracy of the bicycle frame after processing. In addition, the aforementioned processing steps require multiple machines to operate separately, the processing standards are difficult to be unified, and the operation process is complicated and time-consuming.

Therefore, it is necessary to provide a novel and progressive method for processing bicycle frames to solve the above-mentioned problems.

The main purpose of the present invention is to provide a bicycle frame processing method, which can improve the dimensional accuracy of the bicycle frame after processing.

In order to achieve the above object, the present invention provides a bicycle frame processing method, including the following steps: providing a bicycle frame, the bicycle frame includes a plurality of fixedly connected pipes, the plurality of pipes include a base tube and a head tube; cutting the seat tube and the head The tube holes of the tube respectively have a first central axis and a second central axis on the same plane.

The following examples are only used to illustrate the possible implementation aspects of the present invention, but they are not intended to limit the scope of protection of the present invention, and are described first.

Please refer to Figures 1 to 10, which show a preferred embodiment of the present invention. The bicycle frame processing method of the present invention includes the following steps: a bicycle frame 10 is provided, the bicycle frame 10 includes a plurality of fixedly connected pipes 11, and the plurality of pipes 11 includes a seat tube 12 and a head tube 13; the tube holes of the seat tube 12 and the head tube 13 are cut to have a first central axis L1 and a second central axis L2 on the same plane P, respectively. In this way, the dimensional accuracy of the bicycle frame 10 after processing can be improved.

In this embodiment, the bicycle frame 10 is clamped on a fixed machine table 20. The fixed machine table 20 includes a base 21, a setting surface 22 rotatably provided on the base 21, and two The clamping portion 23 of the setting surface 22. The head tube 13 and the seat tube 12 are respectively clamped to the two clamping parts 23, as shown in Figs. 9 and 10, which can stably clamp the bicycle frame 10 to facilitate processing. In detail, a cutting tool 30 (such as a boring cutter) cuts the tube holes of the seat tube 12 and the head tube 13 in a direction parallel to the plane P to improve the machining accuracy. The cutting method of each pipe 11 can be, for example, but not limited to drilling, boring, reaming, etc., and can be selected according to specifications.

The bicycle frame 10 further includes two rear fork frames 14. The inner side surfaces 141 of the two rear fork frames 14 are trimmed to be symmetrical with respect to the plane P, and the dimensional accuracy is better. The cutting step further includes: coaxially cutting one end of each rear fork frame 14 to have a through hole 142 with a central axis perpendicular to the plane P. Each through hole 142 can be used for setting a bicycle rim, and the bicycle rim The wheel rim is provided with a bicycle axle 40, as shown in FIG. 3. Thereby, it can be ensured that the center of the bicycle rim and the plane P overlap each other, and the bicycle axle 40 is assembled to the two rear fork frames 14 perpendicular to the plane P, so that the bicycle rim and the bicycle frame 10 are assembled with each other After that, there is no need to perform correction again, and at the same time, it is ensured that the bicycle rim keeps straight forward and does not deviate during the traveling process, thereby preventing the bicycle axle 40 from deflection and easy damage during use.

The bicycle frame 10 further includes a bottom bracket 15. In the cutting step, a tube hole of the bottom bracket 15 is cut and at least one end surface of the bottom bracket 15 is trimmed to conform to a predetermined size relative to the plane P. After completing the cutting of the seat tube 12 and the head tube 13, the setting surface 22 of the fixed machine table 20 can be rotated to an appropriate angle with respect to the base 21, and the cutting tool 30 then moves in a direction perpendicular to the plane P The pipe hole of the five-way pipe 15 and the through hole 142 of each rear fork 14 are cut.

Before cutting, the seat tube 12, the five-way tube 15 and the head tube 13 are preferably selected from pipe fittings 11 with at least one end of the tube wall thickness not less than 1.5 mm, as shown in Figures 5 and 7, which are easy to weld Moreover, the deformation caused by welding does not affect the size of each tube 11. In the cutting step, in addition to processing functional structures such as the seat post assembly structure and the bearing hole, the seat tube 12, the bottom bracket 15 and the tube wall of the head tube 13 can also be cut to reduce the thickness and achieve lightness. The effect of quantization is shown in Figure 6 and Figure 8.

Through the above steps, the processing of each of the plurality of pipes 11 can be completed on the fixed machine 20 with at least one of the first central axis L1, the second central axis L2, and the plane P as a reference, reducing the need for multiple machines. The errors caused by the processing of the bicycle frame can further improve the dimensional accuracy of the bicycle frame 10 after processing and simplify the processing steps.

10: Bike rack 11: pipe fittings 12: seat tube 13: head tube 14: Rear fork 141: Inside 142: Through Hole 15: Five-way tube 20: Fixed machine 21: Pedestal 22: Setting the surface 23: Clamping part 30: cutting tools 40: bicycle wheel axle P: plane L1: the first central axis L2: second central axis

Fig. 1 is a perspective view of a bicycle frame according to a preferred embodiment of the present invention. Fig. 2 is a side view of a bicycle frame according to a preferred embodiment of the present invention. Fig. 3 is a schematic top view of a bicycle frame in use according to a preferred embodiment of the present invention. Fig. 4 is a perspective view of a bicycle frame of a preferred embodiment of the present invention before cutting. Fig. 5 and Fig. 7 are partial enlarged views of Fig. 4. Fig. 6 and Fig. 8 are partial enlarged views of Fig. 1. Fig. 9 is a schematic diagram of processing of a preferred embodiment of the present invention. Fig. 10 is a schematic diagram of a preferred embodiment of the present invention during cutting.

10: Bike rack

11: pipe fittings

12: seat tube

13: head tube

14: Rear fork

15: Five-way tube

Claims (6)

A method for processing a bicycle frame includes the following steps: Provide a bicycle frame, the bicycle frame includes a plurality of fixedly connected pipe fittings, the plurality of pipe fittings include a tube and a head tube; Cutting the seat tube and the tube hole of the head tube to respectively have a first central axis and a second central axis on the same plane. The bicycle frame processing method according to claim 1, wherein the bicycle frame further includes two rear fork frames, and the inner sides of the two rear fork frames are trimmed to be symmetrical with respect to the plane. The bicycle frame processing method according to claim 2, wherein the cutting step further includes: coaxially cutting one end of each rear fork frame to have a through hole whose central axis is perpendicular to the plane. The bicycle frame processing method according to claim 1, wherein, before cutting, the seat tube and the head tube are selected from tubes with a tube wall thickness of at least one end of not less than 1.5 mm. The bicycle frame processing method according to claim 1, wherein the bicycle frame further includes a bottom bracket tube, and in the cutting step, a hole of the bottom bracket tube is cut and at least one end surface of the bottom bracket tube is trimmed to conform to A predetermined size relative to the plane. The method for processing a bicycle frame according to claim 3, wherein the bicycle frame further includes a five-way tube, and in the cutting step, a hole of the five-way tube is cut and at least one end surface of the five-way tube is trimmed to conform to A predetermined size relative to the plane; before cutting, the seat tube, the head tube, and the bottom bracket tube are selected from pipes with at least one end of the tube wall thickness not less than 1.5 mm; in the cutting step, first parallel Cutting the seat tube and the tube hole of the head tube in the direction of the plane, and then cutting the tube hole of the five-way tube and the through hole of each rear fork in a direction perpendicular to the plane.

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