Manufacturing method of telescopic pipe of folding vertical pipe

Abstract

The invention discloses a manufacturing method of a telescopic pipe of a folding vertical pipe. The manufacturing method comprises the following steps of sectional material cutting, wherein a sectional material is cut into small sections; annealing treatment: carrying out annealing treatment on the small sections of profiles; coating and saponifying; rough forging: stretching under a normal temperature condition to form a standpipe section and a folding joint prototype; precision forging: carrying out precision forging on the folding joint to form a hinge part and a folding joint end face; edge cutting: edge excess materials of the folding joint are cut out; drilling and tapping are conducted, specifically, the folding head hinge of the folding vertical pipe is subjected to drilling, tapping and cutting treatment; performing surface treatment; and the folding vertical pipe is formed. According to the manufacturing method of the folding vertical pipe telescopic pipe, the manufactured folding vertical pipe telescopic pipe is high in strength.

Description

Technical Field

[0001] The present invention relates to the technical field of folding bicycles, and more particularly to a manufacturing method for a folding vertical tube telescopic tube used on a folding bicycle. Background Art

[0002] Folding bicycles are favored by consumers for their characteristics of quick folding or unfolding. When the bicycle is folded, its volume becomes smaller, which greatly facilitates transportation and storage. After unfolding, it can be safely used for people's fitness or commuting.

[0003] The folding vertical tube includes a vertical tube body and a shoulder. The shoulder and the vertical tube body are generally fixedly connected by welding, and this fixed connection method is prone to breakage at the welding point.

[0004] Chinese Patent Document CN112172994A discloses a bicycle vertical tube and its manufacturing method. The manufacturing method includes:

[0005] Stock preparation: Provide an aluminum alloy circular hollow tube.

[0006] Tube shrinking treatment: The two ends of the tube are respectively subjected to tube shrinking treatment, so that one end of the tube forms a first tube section with a first tube diameter, the other end forms a second tube section with a second tube diameter, and the middle forms a third tube section with a third tube diameter. The outer diameter and inner diameter of the third tube section are both larger than the inner diameter and outer diameter of the first tube section, and larger than the inner diameter and outer diameter of the second tube section.

[0007] Water column forming: Perform water-assisted injection molding treatment on the third tube section to form a shoulder cover.

[0008] Sealing: Cut off the second tube section and seal one end of the shoulder cover facing away from the first tube section.

[0009] Hole processing: Process the shoulder cover after water injection molding to form a through hole penetrating the shoulder cover.

[0010] The bicycle vertical tube produced by the above method has high connection strength, but is not suitable for the folding vertical tube. Summary of the Invention

[0011] The purpose of the present invention is to provide a manufacturing method for a folding vertical tube, which is integrally formed and has high strength.

[0012] The technical solution adopted by the manufacturing method for the folding vertical tube telescopic tube disclosed by the present invention is as follows:

[0013] A manufacturing method for a folding vertical tube telescopic tube includes the following steps:

[0014] Profile cutting: Cut the profile into small sections.

[0015] Annealing treatment: Anneal the small sections of the profile.

[0016] Film, saponification;

[0017] Rough forging: Stretching at room temperature to form the vertical pipe section and the prototype of the folding joint;

[0018] Fine forging: Fine forging the folding joint to form the hinge part and the end face of the folding joint;

[0019] Trimming: Cutting off the surplus material of the folding joint;

[0020] Drilling and tapping: Drilling, tapping and cutting treatment on the hinge of the folding head of the folding vertical pipe;

[0021] Surface treatment;

[0022] Form the folding vertical pipe.

[0023] As a preferred solution, in the film and saponification steps, first use aluminum acid removal to clean the annealed small-section profiles for 7 - 10 minutes, then wash with clean water. After cleaning, soak the surface with the film agent at 95 - 110 °C for 1 - 2 minutes, wash again, and perform saponification treatment with a lubricant at a temperature of 95 - 105 °C for 4 - 6 minutes.

[0024] As a preferred solution, in the annealing treatment step, keep the small-section profiles at a constant temperature of 400 °C - 460 °C in the furnace for 3 - 4 hours, and then cool naturally after cooling with the furnace to 180 °C.

[0025] As a preferred solution, before the annealing treatment step, first perform vibration water grinding treatment on the profiles cut into small sections.

[0026] As a preferred solution, after the drilling and tapping treatment, cut the vertical pipe section according to the specified length.

[0027] As a preferred solution, in the surface treatment step, it is surface sandblasting treatment.

[0028] As a preferred solution, after surface sandblasting, perform surface oxidation treatment on the product.

[0029] The beneficial effect of the manufacturing method of the folding vertical telescopic pipe disclosed by the present invention is: high strength due to the integral molding after stretching the small-section profiles. Brief Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram after the profile cutting step of the present invention;

[0031] Figure 2 It is a schematic structural diagram after the rough forging step of the present invention;

[0032] Figure 3It is a schematic structural diagram after the precision forging step of the present invention;

[0033] Figure 4 It is a schematic structural diagram after the trimming step of the present invention;

[0034] Figure 5 It is a schematic structural diagram after the drilling and tapping step of the present invention. Specific embodiments

[0035] The present invention will be further described and explained below in conjunction with specific embodiments and the accompanying drawings of the specification:

[0036] A manufacturing method for a folding vertical pipe telescopic pipe, comprising the following steps:

[0037] Provide pipe-shaped profiles;

[0038] Profile cutting: Cut the profiles into small segments for subsequent processing, and the cutting shape is as Figure 1 shown;

[0039] Vibrating water grinding: Perform vibrating water grinding treatment on the cut small-profile segments to remove sharp corners and burrs;

[0040] Annealing treatment: Keep the small-profile segments at a constant temperature of 400°C - 460°C in the furnace for 3 - 4 hours, then cool them with the furnace to 180°C and then cool naturally to reduce the hardness of the small-profile segments and soften them for processing;

[0041] Film drying: First, clean the annealed small-profile segments with aluminum acid removal for 7 - 10 minutes, then wash them with clean water 2 - 3 times. After cleaning, soak them in a film agent at 95 - 110°C for 1 - 2 minutes, wash them again, and perform saponification treatment with a lubricant at a temperature of 95 - 105°C for 4 - 6 minutes to form a surface film;

[0042] Rough forging: Stretch the small-profile segments after film saponification at room temperature to form a vertical pipe section and a folding joint prototype. Please refer to Figure 2 ;

[0043] Precision forging: Precision forge the folding joint to form a hinge part and a folding joint end face. Please refer to Figure 3 ;

[0044] Trimming: Cut off the folding joint edge surplus material. Please refer to Figure 4 ;

[0045] Drilling and tapping: Drill, tap, and cut the folding head hinge of the folding vertical pipe. Please refer to Figure 5 ;

[0046] Surface treatment: Perform surface sandblasting treatment and surface oxidation treatment on the product after drilling and tapping;

[0047] Form a folding vertical pipe telescopic tube.

[0048] Make 3 samples of the folding vertical pipe telescopic tube with the material of AL6061 and the pipe diameter of 28.6mm according to the above manufacturing method, assemble them with the riser pipe, and according to the ISO4210 standard, apply opposite forces at a distance of 50mm from the end of the bicycle handlebar. The magnitude of the applied force is 200N, the frequency is 3HZ, and it lasts for 100,000 times without breakage, and there is no obvious deformation at the joint; then apply opposite forces at a distance of 50mm from the end of the bicycle handlebar. The magnitude of the applied force is 250N, the frequency is 3HZ, and it lasts for 100,000 times without breakage, and there is no obvious deformation at the joint. It can be seen that the folding vertical pipe telescopic tube manufactured according to the manufacturing method of the folding vertical pipe telescopic tube disclosed in the present invention has high strength.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method for manufacturing a foldable vertical tube telescopic tube, characterized in that: The following steps are involved: Profile cutting: cutting the profile into small sections; Annealing treatment: annealing of small sections of profiles; Film, saponification; Rough forging: stretching at room temperature to form the vertical pipe section and folding joint prototype; Precision forging: Precision forging is performed on the folding joint to form the hinge part and the end face of the folding joint; Edge trimming: cutting out the excess material of the folded joint; Drilling and tapping: Drilling, tapping and cutting of the hinges of the folding head of the folding vertical tube; Surface treatment; A folded vertical tube is formed.

2. The method for manufacturing the foldable vertical tube telescopic tube according to claim 1, characterized in that: In the coating and saponification steps, the annealed small section profile is first cleaned with aluminum acid for 7-10 minutes, then washed with clean water, and then soaked with a coating agent at 95-110°C for 1-2 minutes, washed again, and saponified with a lubricant at a temperature of 95-105°C for 4-6 minutes.

3. The method for manufacturing the foldable vertical tube telescopic tube according to claim 1, characterized in that: In the annealing step, the small section profile is kept at a constant temperature of 400°C-460°C for 3-4 hours, cooled to 180°C in the furnace and then cooled naturally.

4. The method for manufacturing the foldable vertical tube telescopic tube according to claim 1, characterized in that: Before the annealing step, the profiles cut into small sections are subjected to vibration water grinding.

5. The method for manufacturing the foldable vertical tube telescopic tube according to claim 1, characterized in that: After drilling and tapping, the vertical pipe sections are cut according to the specified length.

6. The method for manufacturing the foldable vertical tube telescopic tube according to claim 1, characterized in that: In the surface treatment step, it is surface sanding treatment.

7. The method for manufacturing the foldable vertical tube telescopic tube according to claim 6, characterized in that: After the surface is sanded, the product surface is oxidized.

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